Patent Grant
11942033
This application is a National Phase of PCT Patent Application No. PCT/CN2021/103153 having International filing date of Jun. 29, 2021, which claims the benefit of priority of Chinese Patent Application No. 202110618746.9 filed on Jun. 3, 2021. The contents of the above applications are all incorporated by reference as if fully set forth herein in their entirety.
The present application relates to the field of display technologies, and more particularly to a driving circuit and a display panel.
Current display panels mostly use a 7T1C pixel driving circuit shown in
The embodiments of the present application provide a driving circuit and a display panel, which can reduce an issue that a light-emitting brightness of a light-emitting device changes greatly with time due to a change of a potential at a connection node of a connection transistor.
An embodiment of the present application provides a driving circuit. The driving circuit includes a driving module and an additional module.
The driving module comprises a light-emitting device, a first transistor, and a connection transistor. The light-emitting device and the first transistor are connected in series between a first voltage terminal and a second voltage terminal, and one of a source and a drain of the first transistor is electrically connected to a first signal line; the connection transistor comprises a first sub-connection transistor and a second sub-connection transistor connected in series, the first sub-connection transistor and the second sub-connection transistor have a connection node, one of a source and a drain of the first sub-connection transistor is electrically connected to a gate of the first transistor, and a gate of the first sub-connection transistor and a gate of the second sub-connection transistor are electrically connected.
The additional module comprises a second transistor, one of a source and a drain of the second transistor is electrically connected to the first signal line, and the other of the source and the drain of the second transistor is electrically connected to the connection node and a gate of the second transistor, and a threshold voltage of the second transistor is the same as a threshold voltage of the first transistor.
The present application also provides a display panel including the above-mentioned driving circuit.
The present application also provides a display panel. The display panel includes a plurality of driving circuits arranged in an array and a plurality of additional circuits.
Each of the driving circuits comprises a driving module, the driving module comprises a light-emitting device, a first transistor, and a connection transistor, wherein the light-emitting device and the first transistor are connected in series between a first voltage terminal and a second voltage terminal, and one of a source and a drain of the first transistor is electrically connected to a first signal line; the connection transistor comprises a first sub-connection transistor and a second sub-connection transistor connected in series, the first sub-connection transistor and the second sub-connection transistor have a connection node, one of a source and a drain of the first sub-connection transistor is electrically connected to a gate of the first transistor, and a gate of the first sub-connection transistor and a gate of the second sub-connection transistor are electrically connected.
Each of the additional circuits is electrically connected to the plurality of drive circuits corresponding to a column, each of the additional circuits comprises a first additional module, a second additional module, and a signal module. The first additional module comprises a second odd-transistor, one of a source and a drain of the second odd-transistor is electrically connected to the connection node of the driving circuit in an odd row and a gate of the second odd-transistor, and a threshold voltage of the second odd-transistor is the same as a threshold voltage of the first transistor of the driving circuit in the odd row. The second additional module comprises a second even-transistor, one of a source and a drain of the second even-transistor is electrically connected to the connection node of the driving circuit in an even row and a gate of the second even-transistor, and a threshold voltage of the second even-transistor is the same as a threshold voltage of the first transistor of the driving circuit in the even row. The signal module comprises a fifth-odd-transistor and a fifth-even-transistor, a source and a drain of the fifth-odd-transistor are electrically between one of the source and the drain of the second odd-transistor and the first signal line, a source and a drain of the fifth even-transistor are electrically connected between one of the source and the drain of the second even-transistor and the first signal line, a gate of the fifth odd-transistor is electrically connected to a second signal line, and the gate of the fifth even-transistor is electrically connected to a third signal line.
Beneficial Effect:
In the driving circuit and the display panel provided by the embodiments of the present application, the driving circuit includes a driving module and an additional module. The driving module comprises a light-emitting device, a first transistor, and a connection transistor. The light-emitting device and the first transistor are connected in series between a first voltage terminal and a second voltage terminal, and one of a source and a drain of the first transistor is electrically connected to a first signal line; the connection transistor comprises a first sub-connection transistor and a second sub-connection transistor connected in series, the first sub-connection transistor and the second sub-connection transistor have a connection node, one of a source and a drain of the first sub-connection transistor is electrically connected to a gate of the first transistor, and a gate of the first sub-connection transistor and a gate of the second sub-connection transistor are electrically connected. The additional module comprises a second transistor, one of a source and a drain of the second transistor is electrically connected to the first signal line, and the other of the source and the drain of the second transistor is electrically connected to the connection node and a gate of the second transistor, and a threshold voltage of the second transistor is the same as a threshold voltage of the first transistor. By providing a second transistor having the same threshold voltage as the first transistor in the additional module, the first signal line and the second transistor are used to reduce a voltage between the connection node and the gate of the first transistor. In this way, a potential change amount at the connection node is reduced within one frame, and the issue that the light-emitting brightness of the light-emitting device changes greatly with time within one frame is thereby improved. It is beneficial to improve the issue that the display panel is prone to flicker when the display panel is driven at a low frequency.
In order to make the purpose, technical solutions, and effects of this present application clearer, the following further describes this application in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.
Specifically,
The driving module includes a light-emitting device D1, a first transistor T1, and a connection transistor Tc. The first transistor T1 and the light-emitting device D1 are connected in series between a first voltage terminal VDD and a second voltage terminal VSS. The first transistor T1 is electrically connected to a first signal line DL. The first transistor T1 is used to generate a driving current for driving the light-emitting device D1 to emit light according to a data signal Vdata loaded in the first signal line DL, and to drive the light-emitting device D1 to emit light. The connection transistor Tc is electrically connected to a gate of the first transistor T1. Further, the connection transistor Tc includes a first sub-connection transistor Tc1 and a second sub-connection transistor Tc2 connected in series. The first sub-connection transistor Tc1 and the second sub-connection transistor Tc2 have a connection node A. One of a source and a drain of the first sub-connection transistor Tc1 is electrically connected to a gate of the first transistor T1. A gate of the first sub-connection transistor Tc1 and a gate of the second sub-connection transistor Tc2 are electrically connected.
Optionally, the light-emitting device D1 includes an organic light emitting diode, a sub-millimeter light emitting diode or a micro light emitting diode. Optionally, the driving circuit may be a pixel driving circuit or a backlight driving circuit. When the driving circuit is a pixel driving circuit, the light-emitting device D1 serves as a sub-pixel. When the driving circuit is a backlight driving circuit, the light-emitting device D1 serves as a backlight source.
It can be understood that, in the driving circuits shown in
The additional module includes a second transistor T2. The second transistor T2 is electrically connected to the first signal line DL and a connection node A. A threshold voltage of the second transistor T2 is the same as a threshold voltage of the first transistor T1. Specifically, one of a source and a drain of the second transistor T2 is electrically connected to the first signal line DL. The other of the source and drain of the second transistor T2 is electrically connected to the connection node A and a gate of the second transistor T2.
The additional module reduces a voltage between the connection node A and the gate of the first transistor T1 according to the data signal Vdata loaded in the first signal line DL and the threshold voltage of the second transistor T2. That is, a potential difference between the gate of the first transistor T1 and the connection node A is reduced. Therefore, a potential change amount at the connection node A is reduced within one frame time, and an issue that a light-emitting brightness of the light-emitting device D1 changes greatly with time within one frame time is thereby improved.
It is understandable that the first transistor T1 and the second transistor T2 can have the same preparation parameters to ensure that the second transistor T2 has the same threshold voltage as the first transistor T1. However, in practical applications, due to factors such as manufacturing processes, the threshold voltage of the second transistor T2 may be slightly different from the threshold voltage of the first transistor T1. Therefore, the threshold voltage of the second transistor T2 in the present application is the same as the threshold voltage of the first transistor T1 includes that: the threshold voltage of the second transistor T2 is the same as the threshold voltage of the first transistor due to factors such as manufacturing process. There may be a slight difference in the threshold voltage of T1.
Further, the driving module includes at least one connection transistor Tc. When the driving module includes one connection transistor Tc, the connection transistor Tc may be electrically connected between the gate of the first transistor T1 and one of the source and the drain of the first transistor Tc, or the connection transistor Tc can be electrically connected between the gate of the first transistor T1 and a third voltage terminal Vi. When the driving module includes two connection transistors Tc, the connection transistors Tc are electrically connected between the gate of the first transistor T1 and one of the source and the drain of the first transistor Tc and are electrically connected between the gate of the first transistor T1 and the third voltage terminal Vi, as shown in
Specifically, the connection transistor Tc includes a third transistor T3. The third transistor T3 includes a third sub-connection transistor Tc3 and a fourth sub-connection transistor Tc4 connected in series. The third sub-connection transistor Tc3 and the fourth sub-connection transistor Tc4 have a first sub-connection node A1. The first sub-connection transistor Tc1 includes the third sub-connection transistor Tc3, the second sub-connection transistor Tc2 includes the fourth sub-connection transistor Tc4, and the connection node A includes the first sub-connection node A1. A source and a drain of the third sub-connection transistor Tc3 are electrically connected between the first sub-connection node A1 and the gate of the first transistor T1, a source and a drain of the fourth sub-connection transistor Tc4 are connected between the first sub-connection node A1 and one of the source and the drain of the first transistor T1, the gate of the third sub-connection transistor Tc3 and the gate of the fourth sub-connection transistor Tc4 are electrically connected, and/or, the connection transistor Tc includes a fourth transistor T4, the fourth transistor T4 includes a fifth sub-connection transistor Tc5 and a sixth sub-connection transistor Tc6 connected in series, the fifth sub-connection transistor Tc5 and the sixth sub-connection transistor Tc6 have a second sub-connection node A2. The first sub-connection transistor Tc1 includes the fifth sub-connection transistor Tc5. The second sub-connection transistor Tc2 includes the sixth sub-connection transistor Tc6. The connection node A includes the second sub-connection node A2. A source and a drain of the fifth sub-connection transistor Tc5 are electrically connected between the second sub-connection node A2 and the gate of the first transistor T1. A source and a drain of the sixth sub-connection transistor Tc6 are electrically connected between the second sub-connection node A2 and the third voltage terminal Vi. A gate of the fifth sub-connection transistor Tc5 and a gate of the sixth sub-connection transistor Tc6 are electrically connected. The driving module can reset a gate potential of the first transistor T1 by signals loaded from the fourth transistor T4 and the third voltage terminal Vi.
Optionally, both the gate of the third transistor T3 and the gate of the fourth transistor T4 are electrically connected to a scan line. Specifically, the gate of the third transistor T3 is electrically connected to a nth scan line SL(n) that transmits a nth level scan signal Scan(n). The gate of the fourth transistor T4 is electrically connected to a n−1th scan line SL(n−1) that transmits the n−1th level scan signal Scan(n−1), where n≥1.
Optionally, an active layer of the third transistor T3 and an active layer of the fourth transistor T4 both include inorganic semiconductor materials. Further, the active layer of the third transistor T3 and the active layer of the fourth transistor T4 both include silicon semiconductor material.
Further, please continue to refer to
Further, the additional module further includes a first capacitor C1. The first capacitor C1 is electrically connected between the first voltage terminal VDD, the gate of the second transistor T2, and one of the source and the drain of the second transistor T2, and electrically connected between the first voltage terminal VDD and the connection node A. Specifically, a first end of the first capacitor C1 is electrically connected to the first voltage terminal VDD. A second end of the first capacitor C1, one of the source and the drain of the second transistor T2 connected to the gate of the second transistor T2, and the connection node A are electrically connected.
Further, please continue to refer to
Further, please continue to refer to
Optionally, the gate of the fifth transistor T5 and the gate of the seventh transistor T7 may be electrically connected to a multiplexed signal line ML that transmits different multiplexed signals MUX, as shown in
Optionally, the gate of the fifth transistor T5 and the gate of the seventh transistor T7 may be electrically connected to the same multiplexed signal line ML, as shown in
Optionally, the gate of the fifth transistor T5 and the gate of the seventh transistor T7 may be electrically connected to scan lines SL that transmit different scan signals, as shown in
Optionally, the gate of the sixth transistor T6 may be electrically connected to a clock signal line CKL for transmitting a clock signal, as shown in
In the driving circuit shown in
Please continue to refer to
When the driving module includes a connection transistor Tc, the switching module may include a switching transistor Ts. One of the source and the drain of the switching transistor Ts is electrically connected to the connection node A. The other of the source and the drain of the switching transistor Ts is electrically connected to the second end of the first capacitor C1. When the driving module includes two connection transistors Tc, the switching module may include one switching transistor Ts, as shown in
Specifically, please continue to refer to
Specifically, please continue to refer to
Since the sixth transistor T6 is electrically connected between the second end of the first capacitor C1 and one of the source and the drain of the second transistor T2 connected to the gate of the second transistor T2. Therefore, the electrical connection between the switching transistor Ts and the second end of the first capacitor C1 is that the switching transistor Ts is electrically connected to one of the source and the drain of the sixth transistor T6 connected to the second end of the first capacitor C1. The sixth transistor T6 can realize the electrical connection between the switching transistor Ts and the second transistor T2.
Please continue to refer to
The source and the drain of the eighth transistor T8 are electrically connected between the first signal line DL and the first transistor T1. This can transmit the data signal Vdata loaded by the first signal line DL to the first transistor T1. Specifically, one of the source and the drain of the eighth transistor T8 is electrically connected to one of the source and the drain of the first transistor T1. One of the source and the drain of the eighth transistor T8 is electrically connected to the first signal line DL. The gate of the eighth transistor T8 is electrically connected to the nth scan line SL(n) that transmits the nth level scan signal Scan(n).
The source and the drain of the ninth transistor T9 are electrically connected between the first voltage terminal VDD and the first transistor T1. Specifically, one of the source and the drain of the ninth transistor T9 is electrically connected to one of the source and the drain of the first transistor T1. One of the source and the drain of the ninth transistor T9 is electrically connected to the first voltage terminal VDD. The gate of the ninth transistor T9 is electrically connected to an emission control signal line EML(n) that transmits an emission control signal EM(n).
The source and the drain of the tenth transistor T10 are electrically connected between the light-emitting device D1 and the first transistor T1. Specifically, one of the source and the drain of the tenth transistor T10 is electrically connected to the other of the source and the drain of the first transistor T1. One of the source and the drain of the tenth transistor T10 is electrically connected to an anode of the light-emitting device D1. The gate of the tenth transistor T10 is electrically connected to the emission control signal line EML(n) that transmits the emission control signal EM(n).
The second capacitor C2 is connected in series between the gate of the first transistor T1 and the first voltage terminal VDD.
A cathode of the light-emitting device D1 is electrically connected to the second voltage terminal VSS.
Please continue to refer to
Specifically, please continue to refer to
Reset stage S1: when the n−1th level scan signal Scan(n−1) loaded on the n−1th scan line SL(n−1) and the first multiplexed signal MUX1 loaded on the first multiplexed signal line ML1 are at a low level, the second multiplexed signal MUX2 loaded on the second multiplexed signal line ML2 and the first clock signal CK loaded on the clock signal line CKL are at a high level. The fourth transistor T4 is turned on in response to the n−1th stage scan signal Scan(n−1), this makes the gate potential of the first transistor T1 reset through the third voltage terminal Vi. The seventh transistor T7 is turned on in response to the first multiplexing signal MUX1, this makes the gate potential of the second transistor T2 reset through the third voltage terminal Vi.
Data writing stage S2: the nth level scan signal Scan(n) loaded on the nth scan line SL(n), the second multiplexed signal MUX2 loaded on the second multiplexed signal line ML2, and the first clock signal CK loaded on the clock signal line CKL are at a low level. The first multiplexed signal MUX1 loaded on the first multiplexed signal line ML1 is at a high level. The third transistor T3, the eighth transistor T8, and the eleventh transistor T11 are turned on in response to the n-th stage scan signal Scan(n). The data signal Vdata loaded by the first signal line DL is transmitted to the gate of the first transistor T1 (i.e., point B) through the eighth transistor T8, the first transistor T1, and the third transistor T3. The second capacitor C2 maintains the gate potential of the first transistor T1 at Vdata-Vth1. The eleventh transistor T11 is turned on so that the anode potential of the light-emitting device D1 is reset through the third voltage terminal Vi. The fifth transistor T5 is turned on in response to the second multiplexed signal MUX2. The sixth transistor T6 is turned on in response to the first clock signal CK. The data signal Vdata loaded on the first signal line DL is transmitted to the second end of the first capacitor C1 through the fifth transistor T5, the second transistor T2, and the sixth transistor T6 (i.e., point C). The first capacitor C1 maintains the potential at point C at Vdata-Vth2. Vth1 represents the threshold voltage of the first transistor T1, and Vth2 represents the threshold voltage of the second transistor T2.
Maintaining stage S3: the n+1th level scan signal Scan(n+1) loaded on the n+1th scan line SL(n+1) and the first multiplexed signal MUX1 loaded on the first multiplexed signal line ML1 are at a low level. The second multiplexed signal MUX2 loaded on the second multiplexed signal line ML2 and the first clock signal CK loaded on the clock signal line CKL are at a high level. The switching transistor Ts is turned on in response to the n+1th stage scan signal Scan(n+1). The potential of the first sub-connection node A1 becomes Vdata-Vth2. The potential of the second sub-connection node A2 becomes Vdata-Vth2. The seventh transistor T7 is turned on in response to the first multiplexed signal MUX1, so that the gate of the second transistor T2 is reset through the third voltage terminal Vi.
Light emitting stage S4: The light emitting control signal EM loaded in the light emitting control signal line EML is at a low level. The ninth transistor T9 and the tenth transistor T10 are turned on in response to the light emission control signal. The first transistor T1 generates a driving current to drive the light emitting device D1 to emit light. In the light emitting stage S4, even the first clock signal CK, the first multiplexed signal MUX1, and the second multiplexed signal MUX2 continuously jump between a high level and a low level, respectively, the switching transistor Ts that responds to the scan signal Scan(n+1) of the n+1th stage is always kept in an off state. Therefore, the additional module does not affect the light emitting state of the light-emitting device D1.
Similarly, the gate of the fifth transistor T5 is electrically connected to the first multiplexed signal line ML1. The gate of the seventh transistor T7 is electrically connected to the second multiplexed signal line ML2. Then, the clock signal line CKL electrically connected to the gate of the sixth transistor T6 loads the second clock signal XCK. The first clock signal CK is inverted from the second clock signal XCK. The first clock signal CK is the same phase as the second multiplexed signal MUX2. Then, the working principle of the driving circuit can be obtained through (b) in
Specifically, please continue to refer to
Reset stage S1: the n−1th stage scan signal Scan(n−1) is at low level, and the fourth transistor T4 and the seventh transistor T7 are turned on in response to the n−1th stage scan signal Scan(n−1). The third voltage terminal Vi resets the gate potential of the first transistor T1 and the gate potential of the second transistor T2.
Data writing stage S2: the scan signal Scan(n) of the nth stage is at a low level. The fifth transistor T5, the third transistor T3, the eighth transistor T8, and the eleventh transistor T11 are turned on in response to the n-th stage scan signal Scan(n). In the driving circuit shown in
Maintaining stage S3: the scan signal Scan(n+1) of the n+1th stage is at a low level. The switching transistor Ts is turned on in response to the n+1th stage scan signal Scan(n+1). The potential of the first sub-connection node A1 becomes Vdata-Vth2. The potential of the second sub-connection node A2 becomes Vdata-Vth2.
Light emitting stage S4: The light emitting control signal EM is at a low level. The ninth transistor T9 and the tenth transistor T10 are turned on in response to the emission control signal EM. The first transistor T1 generates a driving current to drive the light-emitting device D1 to emit light.
Specifically, please continue to refer to (a) in
Reset stage S1: When the scan signal Scan(n−1) of the n−1th level is at a low level, the multiplexed signal MUX loaded in the multiplexed signal line ML is at the low level. The fourth transistor T4 is turned on in response to the n−1th stage scan signal Scan(n−1). The third voltage terminal Vi resets the gate potential of the first transistor T1. The seventh transistor T7 is turned on in response to the multiplexed signal MUX. The third voltage terminal Vi resets the gate potential of the second transistor T2.
Data writing stage S2: the nth stage scan signal Scan(n) and the multiplexed signal MUX are at a high level. The third transistor T3, the eighth transistor T8, and the eleventh transistor T11 are turned on in response to the n-th stage scan signal Scan(n). The data signal Vdata is transmitted to the gate of the first transistor T1 (that is, at point B) through the eighth transistor T8, the first transistor T1, and the third transistor T3. The second capacitor C2 maintains the gate potential of the first transistor T1 at Vdata-Vth1. The eleventh transistor T11 is turned on so that the anode potential of the light-emitting device D1 is reset through the third voltage terminal Vi. The fifth transistor T5 and the sixth transistor T6 are turned on in response to the multiplexed signal MUX. The data signal Vdata is transmitted to the second end (i.e., at point C) of the first capacitor C1 through the fifth transistor T5, the second transistor T2, and the sixth transistor T6. The first capacitor C1 maintains the potential at point C at Vdata-Vth2.
Maintaining stage S3: the scan signal Scan(n+1) of the n+1th stage is at a low level. The multiplexed signal MUX is at the low level. The switching transistor Ts is turned on in response to the n+1th stage scan signal Scan(n+1). The potential of the first sub-connection node A1 becomes Vdata-Vth2. The potential of the second sub-connection node A2 becomes Vdata-Vth2. The seventh transistor T7 is turned on in response to the multiplexed signal MUX, so that the gate of the second transistor T2 is reset through the third voltage terminal Vi.
Light emitting stage S4: The light emitting control signal EM is at a low level. The ninth transistor T9 and the tenth transistor T10 are turned on in response to the light emission control signal. The first transistor T1 generates a driving current to drive the light emitting device D1 to emit light.
Similarly, the second transistor T2, the fifth transistor T5, and the sixth transistor T6 included in the additional module are P-type transistors. The seventh transistor T7 is an N-type transistor. The gate of the fifth transistor T5, the gate of the sixth transistor T6, and the gate of the seventh transistor T7 are all electrically connected to the same multiplexed signal line ML. Then, the working principle of the driving circuit can be obtained through (b) in
In the driving circuit shown in
By analyzing the working principle of the driving circuit shown in
For ease of description, the display panel is described by taking the driving circuit as a pixel driving circuit and the light emitting device D1 as a sub-pixel as an example. The driving circuit is a backlight driving circuit. When the light-emitting device D1 is used as a backlight source, the design of the display panel may refer to the driving circuit as a pixel driving circuit. The design of the display panel when the light-emitting device D1 is used as a sub-pixel is not repeated here.
Specifically, the display panel includes a display area 400a and a non-display area 400b. The display panel includes a plurality of sub-pixels 401 arranged in an array. A plurality of the sub-pixels 401 are located in the display area 400a. Each of the sub-pixels 401 is formed by a light-emitting device D1.
Correspondingly, the display panel includes a plurality of the driving circuits. In the driving circuit shown in
Further, in the driving circuit shown in
Further, the gate of the fifth transistor T5 and the gate of the seventh transistor T7 are electrically connected to different multiplexed signal lines. The gate of the sixth transistor T6 is electrically connected to the clock signal line CKL. The display panel also includes a timing controller located in the non-display area 400b. The timing controller is electrically connected to a plurality of the additional modules through a plurality of the clock signal lines.
In the driving circuits shown in
Further, the display panel further includes a gate driving chip 403 and a source driving chip 404 located in the non-display area 400b. The gate driving chip 403 is connected to a plurality of driving circuits through a plurality of scan lines SL. The source driving chip 404 is connected to a plurality of the driving circuits through a plurality of the first signal lines DL.
In the driving circuits shown in
Optionally, the number of the driving circuits may be less than or equal to the number of the sub-pixels 401. Specifically, if each of the driving circuits includes one light-emitting device D1, the number of the driving circuits is equal to the number of the sub-pixels 401. If at least one of the driving circuits includes a plurality of the light-emitting devices D1, the number of the driving circuits is less than the number of the sub-pixels 401.
Optionally, a plurality of the driving circuits may be arranged in the same manner as a sampling of the sub-pixels 401, or may be arranged in a different arrangement from the sub-pixels 401 (As in some display panels, the display area 400a also includes a main display area, a light-transmitting area, and a transition area between the main display area and the light-transmitting area. The sub-pixels 401 located in the light-transmitting area and the transition area are arranged in an array. The first transistors T1 in the plurality of driving circuits are electrically connected to the plurality of sub-pixels 401 located in the light-transmitting area and the transition area, respectively. The connection transistor Tc, the eighth transistor T8, the ninth transistor T9, the tenth transistor T10, the eleventh transistor T11, the switching transistor Ts, and the second capacitor C2 are all located in the transition area. The main display area is an area mainly used for displaying images. The light-transmitting area can also transmit light while being used for displaying images, so that it is located in the area corresponding to the light-transmitting area. The sensor receives the light signal. The sensor includes a fingerprint sensor, a camera, etc.).
Correspondingly, the display panel includes a plurality of the first signal lines DL. The plurality of first signal lines DL are sequentially arranged along the first direction x. Each of the first signal lines DL extends along the second direction y. Each of the first signal lines DL is electrically connected to a plurality of the sub-pixels 401 located in the same column. Further, one of the additional modules can be electrically connected with at least one of the driving modules. The plurality of additional modules connected to an intermediate node Q of the connection transistor Tc in the driving module electrically connected to the plurality of sub-pixels 401 located in the same column and the same first signal line DL are electrically connected. This ensures that the plurality of driving modules and the corresponding additional modules that are electrically connected to the plurality of sub-pixels 401 located in the same column all use the same data signal Vdata. This ensures that the voltage between the connection node A of the connection transistor Tc and the gate of the first transistor T1 in each of the driving modules is effectively reduced.
This application provides a display panel. The display panel includes a plurality of driving circuits 501 arranged in an array, a plurality of additional circuits 502, a plurality of first signal lines DL, a source driving chip 503, and a gate driving chip 504.
Each of the first signal lines DL is electrically connected to a plurality of the driving circuits 501 located in the same column. Each of the first signal lines DL is electrically connected to at least one of the additional circuits 502. Each of the first signal lines DL is used to transmit a data signal Vdata.
The source driving chip 503 is located in the non-display area 500b of the display panel. The source driving chip 503 is electrically connected to the plurality of driving circuits 501 and the plurality of additional circuits 502 through a plurality of first signal lines DL.
The gate driving chip 504 is located in the non-display area 500b of the display panel, and the gate driving chip 504 is electrically connected to the plurality of driving circuits 501 through a plurality of scan lines SL.
Referring to
Please refer to
Specifically, one of the source and the drain of the second transistor T2 in each additional circuit 502 is electrically connected to the corresponding first signal line DL. The other of the source and the drain of the second transistor T2 is electrically connected to the gate of the second transistor T2 and the corresponding connection node A in the driving circuit 501.
It can be understood that in the actual manufacturing process of the display panel, the first transistors T1 in the plurality of driving circuits 501 have the same manufacturing parameters and are prepared simultaneously. Therefore, the threshold voltages of the first transistors T1 in the plurality of driving circuits 501 are the same. In order to save the manufacturing process and ensure that the first transistor T1 in the plurality of driving circuits 501 and the second transistor T2 in the plurality of additional circuits 502 have the same threshold voltage, the second transistor T2 and the first transistor T1 have the same preparation parameters and are prepared simultaneously.
Please continue to refer to
Specifically, the connection transistor Tc includes a third transistor T3. The third transistor T3 is electrically connected between the gate of the first transistor T1 and one of the source and the drain of the first transistor T1; and/or, the connection transistor Tc includes a fourth transistor T4. The fourth transistor T4 is electrically connected between the gate of the first transistor T1 and the third voltage terminal.
Further, the third transistor T3 includes a third sub-connection transistor Tc3 and a fourth sub-connection transistor Tc4 connected in series. The third sub-connection transistor Tc3 and the fourth sub-connection transistor Tc4 have a first sub-connection node A1. The first sub-connection transistor Tc1 includes the third sub-connection transistor Tc3, the second sub-connection transistor Tc2 includes the fourth sub-connection transistor Tc4, and the connection node A includes the first sub-connection node A1. The source and the drain of the third sub-connection transistor Tc3 are electrically connected between the first sub-connection node A1 and the gate of the first transistor T1. The source and the drain of the fourth sub-connection transistor Tc4 are electrically connected between the first sub-connection node A1 and the other of the source and the drain of the first transistor T1. The gate of the third sub-connection transistor Tc3 and the gate of the fourth sub-connection transistor Tc4 are electrically connected.
The fourth transistor T4 includes a fifth sub-connection transistor Tc5 and a sixth sub-connection transistor Tc6 connected in series. The fifth sub-connection transistor Tc5 and the sixth sub-connection transistor Tc6 have a second sub-connection node A2. The first sub-connection transistor Tc1 includes the fifth sub-connection transistor Tc5. The second sub-connection transistor Tc2 includes the sixth sub-connection transistor Tc6. The connection node A includes the second sub-connection node A2. The source and the drain of the fifth sub-connection transistor Tc5 are electrically connected between the second sub-connection node A2 and the gate of the first transistor T1. The source and the drain of the sixth sub-connection transistor Tc6 are electrically connected between the second sub-connection node A2 and the third voltage terminal Vi. The gate of the fifth sub-connection transistor Tc5 and the gate of the sixth sub-connection transistor Tc6 are electrically connected. Optionally, the active layer of the third transistor T3 and the active layer of the fourth transistor T4 both include silicon semiconductor materials.
Further, each of the driving circuits 501 further includes an eighth transistor T8, a ninth transistor T9, a tenth transistor T10, an eleventh transistor T11, and a second capacitor C2.
One of the source and the drain of the eighth transistor T8 is electrically connected to one of the source and the drain of the first transistor T1. One of the source and the drain of the eighth transistor T8 is electrically connected to the corresponding first signal line DL. The gate of the eighth transistor T8 is electrically connected to the nth scan line SL(n) that transmits the nth level scan signal Scan(n).
One of the source and the drain of the ninth transistor T9 is electrically connected to one of the source and the drain of the first transistor T1. One of the source and the drain of the ninth transistor T9 is electrically connected to the first voltage terminal VDD. The gate of the ninth transistor T9 is electrically connected to the emission control signal line EML(n) that transmits the emission control signal EM(n).
One of the source and the drain of the tenth transistor T10 is electrically connected to the other of the source and the drain of the first transistor T1. One of the source and the drain of the tenth transistor T10 is electrically connected to the anode of the light-emitting device D1. The gate of the tenth transistor T10 is electrically connected to the emission control signal line EML(n) that transmits the emission control signal EM(n).
The second capacitor C2 is connected in series between the gate of the first transistor T1 and the first voltage terminal VDD.
The cathode of the light-emitting device D1 is electrically connected to the second voltage terminal VSS. Optionally, the light-emitting device D1 includes a sub-millimeter light emitting diode, a micro light emitting diode or an organic light emitting diode. The light-emitting device D1 may be used as a sub-pixel or a backlight source, and each of the driving circuits may include a plurality of the light-emitting devices D1.
Further, each of the driving circuits 501 further includes a switching module. The switching module includes a switching transistor Ts. Specifically, the connection transistor Tc includes the third transistor T3 and the fourth transistor T4, and the switching module includes a switching transistor Ts. One of the source and the drain of the switching transistor Ts is electrically connected to the first sub-connection node A1 and the second sub-connection node A2. The other of the source and the drain of the switching transistor Ts is electrically connected to the second end of the first capacitor C1 in the corresponding additional circuit 502. Or, the switching transistor Ts includes a first sub-switching transistor Ts1 and a second sub-switching transistor Ts2. One of the source and the drain of the first sub-switching transistor Ts1 is electrically connected to the first sub-connection node A1. The other of the source and the drain of the first sub-switching transistor Ts1 is electrically connected to the second end of the first capacitor C1 in the corresponding additional circuit 502. One of the source and the drain of the second sub-switching transistor Ts2 is electrically connected to the second sub-connection node A2. The other of the source and the drain of the second sub-switching transistor Ts2 is electrically connected to the second end of the first capacitor C1 in the corresponding additional circuit 502.
Please continue to refer to
Further, each of the additional circuits 502 further includes a seventh transistor T7 and a first capacitor C1. The first end of the first capacitor C1 is electrically connected to the first voltage terminal VDD. The second end of the first capacitor C1, one of the source and the drain of the second transistor T2 connected to the gate of the second transistor T2, and the connection node A are electrically connected. One of the source and the drain of the seventh transistor T7 is electrically connected to the third voltage terminal Vi. The other of the source and the drain of the seventh transistor T7 is electrically connected to the gate of the second transistor T2.
Further, each additional circuit 502 further includes a sixth transistor T6. One of the source and the drain of the sixth transistor T6 is electrically connected to the second end of the first capacitor C1. The other of the source and the drain of the sixth transistor T6 is electrically connected to one of the source and the drain of the second transistor T2 connected to the gate of the second transistor T2.
The gate driving chip 504 is electrically connected to the plurality of additional circuits 502 through a plurality of scan lines SL. Specifically, in each additional circuit 502, the gate of the fifth transistor T5, the gate of the sixth transistor T6, and the nth scan line that transmits the nth stage scan signal Scan(n) SL(n) is electrically connected. The gate of the seventh transistor T7 is electrically connected to the n−1th scan line SL(n−1) that transmits the n−1th level scan signal Scan(n−1).
The gate driving chip 504 is electrically connected to the plurality of additional circuits 502 through a plurality of scan lines SL. Each of the additional circuits 502 is connected to a different scan line SL, and a plurality of the additional circuits 502 are all located in the display area 500a. A driving circuit 501 and an additional circuit 502 are arranged correspondingly, as shown in
In practical applications, since the display panel includes a plurality of the driving circuits 501 and a plurality of the additional circuits 502. A plurality of the driving circuits can share the additional circuit 502 to reduce the gate voltage at the connection node A and the first transistor T1 in the driving circuit 501, as shown in
Specifically, referring to
Further, each of the additional circuits 502 includes a first additional module 5021, a second additional module 5022, and a signal module. The first additional module 5021 is electrically connected to the driving circuit 5011 located in the odd row. The second additional module 5022 is electrically connected to the driving circuit 5012 in the even row. The first additional module 5021 and the second additional module 5022 in each additional circuit 502 are electrically connected to the same first signal line DL.
The first additional module 5021 includes a second odd transistor T21. One of the source and the drain of the second odd transistor T21 is electrically connected to the connection node A of the driving circuit 5011 in the odd row and the gate of the second-odd transistor T21. The threshold voltage of the second-odd transistor T21 is the same as the threshold voltage of the first transistor T1 of the driving circuit 5011 in the odd row.
The second additional module 5022 includes a second-even transistor T22. One of the source and the drain of the second-even transistor T22 is electrically connected to the connection node A of the driving circuit 5012 in an even row and the gate of the second-even transistor T22. The threshold voltage of the second-even transistor T22 is the same as the threshold voltage of the first transistor T1 of the driving circuit 5012 in the even row.
The signal module includes a fifth-odd transistor T51 and a fifth-even transistor T52. The source and the drain of the fifth-odd transistor T51 are electrically connected between one of the source and the drain of the second-odd transistor T21 and the corresponding first signal line DL. The source and the drain of the fifth-even transistor T52 are electrically connected between one of the source and the drain of the second-even transistor T22 and the corresponding first signal line DL. The gate of the fifth-odd transistor T51 is electrically connected to the second signal line. The gate of the fifth-even transistor T52 is electrically connected to the third signal line. One of the second signal line and the third signal line may be a first reset signal line ML1 that transmits a first reset signal MUX1. The other of the second signal line and the third signal line may be a second reset signal line ML2 that transmits a second reset signal MUX2.
Further, the first additional module 5021 further includes a first odd capacitor C11. The first odd capacitor C11 is electrically connected between the first voltage terminal VDD and the gate of the second-odd transistor T21. The second additional module 5022 also includes a first even capacitor C12. The first-even capacitor C12 is electrically connected between the first voltage terminal VDD and the gate of the second-even transistor T22.
Further, the first additional module 5021 further includes a sixth-odd transistor T61. The source and the drain of the sixth-odd transistor T61 are electrically connected between the first sub-switching transistor Ts1 of the driving circuit 5011 in the odd row and one of the source and the drain of the second-odd transistor T21, and are electrically connected between the second sub-switching transistor Ts2 of the driving circuit 5011 in the odd row and one of the source and the drain of the second-odd transistor T21. The second additional module 5022 also includes a sixth-even transistor T62. The source and the drain of the sixth-even transistor T62 are electrically connected between the first sub-switching transistor Ts1 of the driving circuit 5012 in the even row and one of the source and the drain of the second-even transistor T22, and are electrically connected between the second sub-switching transistor Ts2 of the driving circuit 5012 in the even row and one of the source and the drain of the second-even transistor T21.
Further, the first additional module 5021 further includes a seventh-odd transistor T71. The source and the drain of the seventh-odd transistor T71 are electrically connected between the third voltage terminal Vi and the gate of the second-odd transistor T21. The second additional module 5022 also includes a seventh-even transistor T72. The source and the drain of the seventh-even transistor T72 are electrically connected between the third voltage terminal Vi and the gate of the second-even transistor T22.
Please continue to refer to
Further, the display panel further includes a timing controller. The timing controller is located in the non-display area 500b of the display panel. The timing controller is electrically connected to the plurality of additional circuits 502 through the first clock signal line CKL1 and the second clock signal line CKL2. Specifically, the gate of the sixth-odd transistor T61 in the first additional module 5021 is electrically connected to the first clock signal line CKL1. The gate of the sixth-even transistor T62 in the second additional module 5022 is electrically connected to the second clock signal line CKL2.
Please continue to refer to
Compared with the display panel shown in
Referring to
When the scan signal Scan(1) is at a low level, the second multiplexed signal MUX2 and the first clock signal CK are at a low level. The first multiplexed signal MUX1 and the second clock signal XCK are at a high level. The third transistor T3, the eighth transistor T8, and the eleventh transistor T11 in the plurality of driving circuits 5011 located in the first row are turned on in response to the scan signal Scan(1). The data signal Vdata loaded on the plurality of first signal lines DL is transmitted to the gate of the first transistor T1 through the eighth transistor T8, the first transistor T1, and the third transistor T3 (that is at point B). The second capacitor C2 maintains the gate potential of the first transistor T1 at Vdata-Vth1. (That is, the potential at point B in the driving circuit in the first row and the first column is Vdata1-Vth1. The potential at point B in the driving circuit in the first row and the second column is Vdata2-Vth1. Vdatai represents the data signal loaded on the i-th sub-signal line DLi, i=1, 2, . . . ). The eleventh transistor T11 in the plurality of driving circuits 5011 located in the first row is turned on so that the anode potential of the light-emitting device D1 is reset through the third voltage terminal Vi. The fifth-odd transistor T51 in the first additional module 5021 electrically connected to the plurality of driving circuits 5011 located in the first row is turned on in response to the second multiplexed signal MUX2. The sixth-odd transistor T61 is turned on in response to the first clock signal CK. The data signals Vdata loaded on the plurality of first signal lines DL are transmitted to the second end (that is, at the point Co) of the first odd capacitor C11 through the fifth-odd transistor T51, the second-odd transistor T21, and the sixth-odd transistor T61. The first odd capacitor C11 maintains the potential at the point Co as Vdata-Vth2. (That is, the electric potential at the point Co in the first additional module that is electrically connected to the driving circuit located in the first row and the first column is Vdata1-Vth2. Compared with the electric potential at the point Co in the first row and the second column, the potential at the point Co in the first additional module electrically connected to the driving circuit is Vdata2-Vth2, . . . ).
At the same time, the fourth transistor T4 in the plurality of driving circuits 5012 located in the second row (even-numbered row) is turned on in response to the scan signal Scan(1). This makes the gate potential of the first transistor T1 reset through the third voltage terminal Vi. The seventh-even transistor T72 in the second additional module 5022 electrically connected to the plurality of driving circuits 5012 located in the second row is turned on in response to the second multiplexed signal MUX2. This makes the gate potential of the second even transistor T22 reset through the third voltage terminal Vi.
When the scan signal Scan(2) is at a low level, the second multiplexed signal MUX2 and the first clock signal CK are at a high level. The first multiplexed signal MUX1 and the second clock signal XCK are at a low level. The switching transistors Ts in the plurality of driving circuits 5011 located in the first row are turned on in response to the scan signal Scan(2). The potential at the connection node A becomes Vdata-Vth2 (that is, the potential at the connection node A in the driving circuit in the first row and the first column becomes Vdata1-Vth2. The potential at the first row and the first column becomes Vdata1-Vth2. The potential at the connection node A in the driving circuit of the second column becomes Vdata2-Vth2, . . . ). The seventh-odd transistor T71 in the first additional module 5021 electrically connected to the plurality of driving circuits 5011 located in the first row is turned on in response to the first multiplexed signal MUX1. This makes the gate of the second-odd transistor T21 reset through the third voltage terminal Vi.
At the same time, the third transistor T3, the eighth transistor T8, and the eleventh transistor T11 in the plurality of driving circuits 5012 located in the second row are turned on in response to the scan signal Scan(2). The data signal Vdata loaded by the plurality of first signal lines DL is transmitted to the gate of the first transistor T1 through the eighth transistor T8, the first transistor T1, and the third transistor T3 (that is at point B). The second capacitor C2 maintains the gate potential of the first transistor T1 at Vdata-Vth1. (That is, the potential at point B in the driving circuit in the second row and first column is Vdata1-Vth1. The potential at point B in the driving circuit in the second row and second column is Vdata2-Vth1, . . . ). The eleventh transistor T11 in the plurality of driving circuits 5012 located in the second row is turned on so that the anode potential of the light emitting device D1 is reset through the third voltage terminal Vi. The fifth even transistor T52 in the second additional module 5022 electrically connected to the plurality of driving circuits 5012 located in the second row is turned on in response to the first multiplexed signal MUX1. The sixth-even transistor T62 is turned on in response to the second clock signal XCK. The data signals Vdata loaded by the plurality of first signal lines DL are transmitted to the second end (that is, at the Ce point). of the first even capacitor C12 through the fifth even transistor T52, the second even transistor T22, and the sixth even transistor T62. The first even capacitor C12 maintains the potential at the point Ce at Vdata-Vth2. (That is, the electric potential at the point Ce in the second additional module electrically connected to the driving circuit in the second row and the first column is Vdata1-Vth2. Compared with the electric potential at the point Ce in the second row and the second column, the electric potential at the Ce point in the second additional module electrically connected to the driving circuit is Vdata2-Vth2, . . . ).
At the same time, the fourth transistor T4 in the plurality of driving circuits 5011 located in the third row (odd-numbered row) is turned on in response to the scan signal Scan(2). This makes the gate potential of the first transistor T1 reset through the third voltage terminal Vi. The seventh-odd transistor T71 in the first additional module 5021 electrically connected to the plurality of driving circuits 5011 located in the third row is turned on in response to the first multiplexed signal MUX1. This makes the gate of the second-odd transistor T21 reset through the third voltage terminal Vi. It is understandable that the first additional module 5021 is only electrically connected to the driving circuits in odd rows. Therefore, the first additional module 5021 electrically connected to the plurality of driving circuits located in the third row is the first additional module 5021 electrically connected to the plurality of driving circuits located in the third row.
When the emission control signal EM1 is at a low level, the ninth transistor T9 and the tenth transistor T10 in the plurality of driving circuits 5011 located in the first row are turned on in response to the emission control signal EM1, and the first A transistor T1 generates a driving current to drive the light emitting device D1 to emit light.
By analogy, it can also be obtained that when the remaining scan signals such as Scan(3) are at a low level, the working principle corresponding to the display panel will not be repeated here.
By analyzing the working principle of the display panel shown in
In addition, the gate of the fifth-odd transistor T51 in the first additional module 5021 and the gate of the seventh-even transistor T72 in the second additional module 5022 can also be electrically connected to the first multiplexed signal line ML1. The gate of the seventh-odd transistor T71 in the first additional module 5021 and the gate of the fifth-even transistor T52 in the second additional module 5022 can also be electrically connected to the second multiplexed signal line ML2. Correspondingly, the gate of the sixth-odd transistor T61 in the first additional module 5021 is electrically connected to the second clock signal line CKL2. The gate of the sixth-even transistor T62 in the second additional module 5022 is electrically connected to the first clock signal line CKL1. The corresponding control sequence is shown in
Optionally, the gate of the fifth-odd transistor T51, the gate of the fifth-even transistor T52, the gate of the seventh-odd transistor T71, and the gate of the seventh-even transistor T72 are all electrically connected to the first multiplexed signal line ML1. The gate of the sixth-odd transistor T61 and the gate of the sixth-even transistor T62 are both electrically connected to the first multiplexed signal line ML1 or both are electrically connected to the second clock signal line CKL2. At this time, the fifth-odd transistor T51, the sixth-odd transistor T61, and the seventh-even transistor T72 are N-type transistors. The fifth-even transistor T52, the sixth-even transistor T62, and the seventh-odd transistor T71 are P-type transistors to reduce the number of multiplexed signal lines used by the display panel. The timings of the first multiplexed signal MUX1 loaded on the first multiplexed signal line ML1 and the second clock signal XCK loaded on the second clock signal line CKL2 are shown in
Optionally, the gate of the fifth-odd transistor T51, the gate of the fifth-even transistor T52, the gate of the seventh-odd transistor T71, and the gate of the seventh-even transistor T72 are all electrically connected to the second multiplexed signal line ML2. The gate of the sixth-odd transistor T61 and the gate of the sixth-even transistor T62 are both electrically connected to the second multiplexed signal line ML2 or both are electrically connected to the first clock signal line CKL1. At this time, the fifth-odd transistor T51, the sixth-odd transistor T61, and the seventh-even transistor T72 are N-type transistors. The fifth-even transistor T52, the sixth-even transistor T62, and the seventh-odd transistor T71 are P-type transistors to reduce the number of multiplexed signal lines used by the display panel. The timings of the second multiplexed signal MUX2 loaded on the second multiplexed signal line ML2 and the first clock signal CK loaded on the first clock signal line CKL1 are shown in
Optionally, a plurality of the driving circuits 501 located in the same column in the display panel shown in
The present application also provides a display device, which includes any of the above-mentioned driving circuits or any of the above-mentioned display panels.
Understandably, the display device includes a movable display device (such as a notebook computer, a mobile phone, etc.), a fixed terminal (such as a desktop computer, a TV, etc.), a measuring device (such as a sports bracelet, a thermometer, etc.), and the like.
Specific examples are used in this article to illustrate the principles and implementation of the application. The description of the above examples is only used to help understand the method and core ideas of the application. At the same time, for those skilled in the art, according to the idea of this application, there will be changes in the specific implementation and the scope of application. In summary, the content of this specification should not be construed as a limitation on this application.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110618746.9 | Jun 2021 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/103153 | 6/29/2021 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2022/252321 | 12/8/2022 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 11011113 | Lu et al. | May 2021 | B1 |
| 20180130410 | Gao | May 2018 | A1 |
| 20180130420 | Gao | May 2018 | A1 |
| 20180130424 | Gao | May 2018 | A1 |
| 20220139307 | Zhang | May 2022 | A1 |
| Number | Date | Country |
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| 106409225 | Feb 2017 | CN |
| 106504701 | Mar 2017 | CN |
| 107103878 | Aug 2017 | CN |
| 107680533 | Feb 2018 | CN |
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| 111883044 | Nov 2020 | CN |
| 112562588 | Mar 2021 | CN |
| Number | Date | Country | |
|---|---|---|---|
| 20240021154 A1 | Jan 2024 | US |
