Patent Application
20240087518
This application claims the priority of Chinese patent application No. 202211103061.1, filed on Sep. 9, 2022, the entire content of which is incorporated herein by reference.
The present disclosure relates to the field of display technology and, more specifically, to a display panel and a driving method thereof.
Organic light-emitting display devices have the advantages of self-luminescence, low driving voltage, high luminous efficiency, fast response speed, compactness, and high contrast ratio, and are considered to be the next-generation display devices.
A pixel in an organic light-emitting display device includes a pixel circuit and a light-emitting element. A driving transistor in the pixel circuit can generate a driving current, and the light-emitting element can emit light in response to the driving current.
However, existing circuit structure of the pixel circuit requires multiple groups of shift register circuits to control the pixel circuit, which is not beneficial to the narrow frame design of the display panel.
One aspect of the present disclosure provides a display panel. The display panel includes a pixel circuit, the pixel circuit including a driving transistor, a data writing transistor, a threshold compensation transistor, a first reset transistor, a bias transistor, and a light-emitting control module; and a light-emitting element. The data writing transistor is electrically connected to a first terminal of the driving transistor. The threshold compensation transistor is connected in series between a gate of the driving transistor and a second terminal of the driving transistor, and configured to detect and self-compensate a threshold voltage deviation of the driving transistor. The first reset transistor is electrically connected to the second terminal of the driving transistor. The bias transistor is electrically connected to the second terminal of the driving transistor. The light-emitting control module is respectively connected in series with the driving transistor and the light-emitting element to control whether a driving current flows through the light-emitting element. The data writing transistor and the first reset transistor have the same transistor type.
Another aspect of the present disclosure provides a display panel, the display panel includes a pixel circuit, the pixel circuit including a driving transistor, a data writing transistor, a threshold compensation transistor, a first reset transistor, a bias transistor, and a light-emitting control module; and a light-emitting element. The data writing transistor is electrically connected to a first terminal of the driving transistor. The threshold compensation transistor is connected in series between a gate of the driving transistor and a second terminal of the driving transistor, and configured to detect and self-compensate a threshold voltage deviation of the driving transistor. The first reset transistor is electrically connected to the second terminal of the driving transistor. The bias transistor is electrically connected to the second terminal of the driving transistor. The light-emitting control module is respectively connected in series with the driving transistor and the light-emitting element to control whether a driving current flows through the light-emitting element. The first reset transistor and the bias transistor have the same transistor type.
Another aspect of the present disclosure provides a display panel driving method. The method includes a display panel, the display panel including a pixel circuit and a light-emitting element, the pixel circuit including a driving transistor, a data writing transistor, a threshold compensation transistor, a first reset transistor, a bias transistor, and a light-emitting control module, a working process of the pixel circuit including a first bias stage, a reset stage, a data writing stage, and a light-emitting stage. The method includes turning on the bias transistor to provide a bias voltage to a second terminal of the driving transistor in the first bias stage; turning on the first reset transistor and the threshold compensation transistor to provide a first reference voltage to a gate of the driving transistor in the reset stage; turning on the data writing transistor and the threshold compensation transistor to provide a data signal to the gate of the driving transistor in the data writing stage; and turning on the light-emitting control module to control a driving current to flow through the light-emitting element in the light-emitting stage.
Compared with the existing technology, the bias transistor in the pixel circuit in the display panel provided by the embodiments of the present disclosure can be used to bias the second terminal of the driving transistor to address the threshold shift of the driving transistor. The gate of the driving transistor can be reset through the first reset transistor. That is, the bias transistor in the pixel circuit only needs to receive a signal that can bias the second terminal of the driving transistor. The received signal for biasing the second terminal of the driving transistor can be a fixed signal, such that there is no need to set an independent shift register circuit to control the signal. Further, since the transistor type of the data writing transistor in the pixel circuit can be the same as the transistor type of the first reset transistor, the control of the data writing transistor and the first reset transistor can be realized through a set of shift register circuit, thereby reducing the number of shift register circuits, which is beneficial in realizing the narrow frame design of the display panel, and the performance of the driving transistor can be ensured, thereby ensuring the display effect of the display panel.
In order to illustrate the technical solutions in accordance with the embodiments of the present disclosure more clearly, the accompanying drawings to be used for describing the embodiments are introduced briefly in the following. It is apparent that the accompanying drawings in the following description are only some embodiments of the present disclosure. Persons of ordinary skill in the art can obtain other accompanying drawings in accordance with the accompanying drawings without any creative efforts.
Technical solutions of the present disclosure will be described in detail with reference to the drawings, in which the same numbers refer to the same or similar elements unless otherwise specified. It will be appreciated that the described embodiments represent some, rather than all, of the embodiments of the present disclosure. Other embodiments conceived or derived by those having ordinary skills in the art based on the described embodiments without inventive efforts should fall within the scope of the present disclosure.
In order to enable the transistor T5 to receive different signals in different working stages of the pixel circuit, a set of independent shift register circuits need to be added to provide the input signal DVINI for the transistor T5. This leads to a large number of shift register circuits located in the border area of the display panel, which is not beneficial to the narrow frame design of the display panel.
Embodiments of the present disclosure provides a display panel with an improved pixel circuit, which can avoid the threshold shift of the driving transistor, and reduce the number of shift register circuits in the border area of the display panel, thereby realizing the narrow frame design of the display panel.
In order to make the objectives, technical solutions, and advantages of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be described below with reference to the drawings.
As shown in
The threshold compensation transistor T4 is connected in series between a gate of the driving transistor T3 and a second terminal of the driving transistor T3. The threshold compensation transistor T4 may be configured to detect and self-compensate the deviation of the threshold voltage of the driving transistor T3.
The first reset transistor T8 is electrically connected to the second terminal of the driving transistor T3.
The bias transistor T5 is electrically connected to the second terminal of the driving transistor T3.
The light-emitting control module 13 is connected in series with the driving transistor T3 and the light-emitting element Q, respectively. The light-emitting control module 13 may be configured to control whether the driving current flows through the light-emitting element Q.
In some embodiments, the transistor type of the data writing transistor T2 may be the same as the transistor type of the first reset transistor T8.
More specifically, in the embodiments of the present disclosure, the data writing transistor T2 may write the data signal Vdata to the driving transistor T3. The driving transistor T3 may generate a driving current based on the data signal Vdata, and the light-emitting control module 13 may control whether the driving current flows through the light-emitting element Q, thereby controlling the display state of the light-emitting element Q.
As shown in
Further, the transistor type of the data writing transistor T2 in the pixel circuit 12 may be the same as the transistor type of the first reset transistor T8. For example, the data writing transistor T2 and the first reset transistor T8 may both be P-type transistors, and the enable level that controls the conduction of the data writing transistor T2 and the enable level that controls the conduction of the first reset transistor T8 may both be low levels. Or, the data writing transistor T2 and the first reset transistor T8 may both be N-type transistors, and the enable level that controls the conduction of the data writing transistor T2 and the enable level that controls the conduction of the first reset transistor T8 may both be high levels. The first reset transistor T8 and the data writing transistor T2 of the pixel circuit 12 may be turned on in a time division, and the signals provided by the adjacent two-stage shift registers in the same group of shift register circuits may be used to control the first reset transistor T8 and the data writing transistor T2 respectively. The control of the data writing transistor T2 and the first reset transistor T8 can be realized simultaneously through one group of shift register circuits to reduce the number of shift register circuits, thereby realizing a narrow frame design of the display panel, and ensuring the performance of the driving transistor T3 to ensure the display effect of the display panel.
For pixel circuits 12 located in adjacent rows, the signal of the second scan signal terminal SC_P(n−1) that is electrically connected to the gate of first reset transistor T8 of the pixel circuit 12 in the current row (e.g., the nth row) may be the same as the signal of the first scan signal terminal SC_P(n) that is electrically connected to the gate of the data writing transistor T2 of the pixel circuit 12 in the previous row (e.g., the n−1th row)
More specifically, in the embodiments of the present disclosure, the gate of the data writing transistor T2 may be electrically connected to the first scan signal terminal SC_P(n). The first scan signal terminal SC_P(n) may be used for outputting a first control signal for controlling the data writing transistor T2. The first control signal may be a pulse signal. A valid pulse of the first control signal may control the data writing transistor T2 to be in an on state to write the data signal Vdata to the first terminal (the second terminal N2) of the driving transistor T3, and an invalid pulse of the first control signal may control the data writing transistor T2 to be in an off state. That is, under the control of the first control signal, the data writing transistor T2 may provide the data signal Vdata to the first terminal of the driving transistor T3.
It should be noted that the data writing transistor T2 may cooperate with the threshold compensation transistor T4 to write the data signal Vdata to the gate of the driving transistor T3. At this time, both the data writing transistor T2 and the threshold compensation transistor T4 may be in the on state.
The gate of the first reset transistor T8 may be electrically connected to the second scan signal terminal SC_P(n−1), and the second scan signal terminal SC_P(n−1) may be used for outputting a second control signal for controlling the first reset transistor T8. The second control signal may be a pulse signal. A valid pulse of the second control signal may control the first reset transistor T8 to be in an on state, and provide the reference voltage to the second terminal of the driving transistor T3, and an invalid pulse of the second control signal may control the first reset transistor T8 to be in an off state.
It should be noted that the first reset transistor T8 may cooperate with the threshold compensation transistor T4 to reset the gate of the driving transistor T3. At this time, both the first reset transistor T8 and the threshold compensation transistor T4 may be in an on state.
The display panel may include a plurality of shift register circuits. One shift register circuit may include multi-stage shift registers arrange in cascade, and each stage of the shift registers may be set to correspond to a pixel circuit row. For example, the nth shift register may provide the control signal for the nth row of the pixel circuits. The signal provided by the second scan signal terminal SC_P(n−1) to which the gate of the first reset transistor T8 of the pixel circuit 12 is electrically connected may be provided by the n−1th shift register in the cascaded shift registers, that is, the control signal provided by the shift register corresponding to the pixel circuit of the n−1th can be borrowed. The signal provided by the first scan signal terminal SC_P(n) to which the gate of the data writing transistor T2 is electrically connected may be provided by the n−1th shift register in the cascaded shift registers. The transistor type of the data writing transistor T2 in the pixel circuit 12 may be the same as the transistor type of the first reset transistor T8 in the pixel circuit 12. The signal provided by the second scan signal terminal SC_P(n−1) to which the gate of the first reset transistor T8 in the pixel circuit of the nth row is electrically connected and the signal provided by the first scan signal terminal SC_P(n) to which the gate of the data writing transistor T2 in the pixel circuit of the n−1th row is electrically connected may be provided by the same stage shift register (such as the n−1 stage). That is, the same shift register may provide the control signals to the data writing transistor T2 and the first reset transistor T8 in the pixel circuit. Therefore, in the display panel provided by the embodiments of the present disclosure, the number of shift register circuits in the frame area of the display panel can be reduced by improving the pixel circuit 12, thereby realizing the narrow frame design of the display panel.
Refer to
More specifically, in the embodiments of the present disclosure, the gate of the bias transistor T5 may be electrically connected to the third scan signal terminal SC_P1, and the gate of the second reset transistor T7 may be electrically connected to the fourth scan signal terminal SC_P2. The third scan signal terminal SC_P1 may be used for outputting a signal for controlling the bias transistor T5, and the fourth scan signal terminal SC_P2 may be used for outputting a signal for controlling the second reset transistor T7, and both signals may be a third control signal. The third control signal may be a pulse signal. A valid pulse of the third control signal may control the bias transistor T5 to be in an on state to bias the second terminal of the driving transistor T3, and control the second reset transistor T7 to be in an on state to bias the anode of the light-emitting element Q to perform a reset. An invalid pulse of the third control signal may control the bias transistor T5 and the second reset transistor T7 to be in an off state.
In the embodiments of the present disclosure, the same signal may be used to control on and off states of the bias transistor T5 and the second reset transistor T7, and the same shift register of the shift register circuit may be used to provide the control signal for the bias transistor T5 and the second reset transistor T7, thereby reducing the number of shift register circuits provided for each transistor.
For pixel circuits located in two adjacent groups, the signal of the third scan signal terminal SC_P1 to which the gate of the bias transistor T5 of the pixel circuit 12 of the current group is electrically connected may be the same as the signal of the fourth scan signal terminal SC_P2 to which the gate of the second reset transistor T7 of the pixel circuit 12 of the previous group is electrically connected, where a group may include two adjacent rows of pixel circuits 12.
More specifically, in the embodiments of the present disclosure, since the display panel includes a plurality of pixels 11 arrange in an array, each pixel 11 may include a light-emitting element Q and the pixel circuit 12 may be electrically connected to the light-emitting element Q. In each driving cycle, the driving of the pixel circuit 12 in each row may be realized in a row-by-row scanning manner. As shown in
The shift register circuit of the display panel may be set as a one-stage shift register corresponding to two rows of pixel circuits. For example, a one-stage shift register may be configured to provide signals for the third scan signal terminal SC_P1 of the bias transistors in the pixel circuits of two adjacent rows respectively. Two rows of pixel circuits corresponding to the same stage of shift register may form a group, and for pixel circuits located in two adjacent groups, the signal of the third scan signal terminal SC_P1 to which the gate of the bias transistor T5 of the pixel circuit located in the current group (e.g., the nth row and the n+1th row) is electrically connected to may be the same as the signal of the fourth scan signal terminal SC_P2 to which the gate of the second reset transistor T7 of the pixel circuit located in the previous group (e.g., the n−2th row and the n−1th row) is electrically connected to, and the signal may be provided by the same stage shift register.
In some embodiments, the active layer of the threshold compensation transistor T4 may include metal oxide.
More specifically, in the embodiments of the present disclosure, the threshold compensation transistor T4 may be a metal oxide transistor with low leakage current level. That is, the active layer of the threshold compensation transistor T4 may use metal oxide, which can keep the gate of the driving transistor T3 at a stable potential in the light-emitting stage, thereby avoiding the brightness reduction in the light-emitting stage caused by the current leakage of the threshold compensation transistor T4.
In some embodiments, the active layer of the threshold compensation transistor T4 may be indium gallium zinc oxide (IGZO).
The IGZO is composed of In2O3, Ga2O3, and ZnO, and the forbidden band width is approximately 3.5 eV, which is an N-type semiconductor material. That is, in the embodiments of the present disclosure, the threshold compensation transistor T4 is an N-type transistor as an example for description.
Based on the low leakage characteristics of the threshold compensation transistor T4, the data writing transistor T2 and the first reset transistor T8 may be low temperature poly silicon (LTPS) transistors, which does not affect the stability of the data writing transistor T2 writing the data signal Vdata to the gate of the driving transistor T3, nor does it affect the reset effect of the first reset transistor T8 for resetting the gate of the driving transistor T3, and the current leakage of the first reset transistor T8 will not affect the gate potential of the driving transistor T3.
In the embodiments of the present disclosure, the driving transistor T3, the data writing transistor T2, the bias transistor T5, the first reset transistor T8, the second reset transistor T7, and the active layers of the transistors in the light-emitting control module 13 may include polysilicon materials.
As shown in
The light-emitting control module 13 may include a first light-emitting control transistor T1 and a second light-emitting control transistor T6. The first light-emitting control transistor T1 may be electrically connected to the second node N2, the first terminal of the second light-emitting control transistor T6 may be electrically connected to the third node N3, and the second terminal of the second light-emitting control transistor T6 may be electrically connected to the third node N4. The gate of the first light-emitting control transistor T1 and the gate of the second light-emitting control transistor T6 may both be electrically connected a light-emitting control signal terminal EM.
In some embodiments, the light-emitting element Q may be electrically connected to the fourth node N4.
More specifically, in the embodiments of the present disclosure, the gate of the data writing transistor T2 may be electrically connected to the first scan signal terminal SC_P(n), the first terminal of the data writing transistor T2 may be electrically connected to the data signal Vdata, and the second terminal of the data writing transistor T2 may be electrically connected the second node N2. The data signal terminal Vdata may be used for outputting the data signal Vdata. The first scan signal terminal SC_P(n) may be used for outputting a first control signal for controlling the data writing transistor T2. The first control signal may be a pulse signal. A valid pulse of the first control signal may control the data writing transistor T2 to be in an on state to write the data signal Vdata to the gate of the driving transistor T3. An invalid pulse of the first control signal may control the data writing transistor T2 to be in an off state. Therefore, under the control of the first control signal, the data writing transistor T2 may selectively write the data signal Vdata required by the pixel.
The gate of the first reset transistor T8 may be electrically connected to the second scan signal terminal SC_P(n−1), the first terminal of the first reset transistor T8 may be electrically connected to the first reference voltage terminal Vref1, and the second terminal of the first reset transistor T8 may be electrically connected to the third node N3. The first reference voltage terminal Vref1 may be used for outputting a first reset signal for resetting the gate of the driving transistor T3. The second scan signal terminal SC_P(n−1) may be used for outputting a second control signal for controlling the first reset transistor T8. The second control signal may be a pulse signal. A valid pulse of the second control signal may control the first reset transistor T8 to be in an on state to reset the gate of the driving transistor T3. An invalid pulse of the second control signal may control the first reset transistor T8 to be in an off state.
The gate of the bias transistor T5 may be electrically connected to the third scan signal terminal SC_P1, the first terminal of the bias transistor T5 may be electrically connected to the bias voltage terminal DVH, and the second terminal of the bias transistor T5 may be electrically connected to the third node N3. The bias voltage terminal DVH may be used for outputting a bias signal for biasing the second terminal of the driving transistor T3. The third scan signal terminal SC_P1 may be used for outputting a third control signal for controlling the bias transistor T5. The third control signal may be a pulse signal. A valid pulse of the third control signal may control the bias transistor T5 to be in an on state to bias the second terminal of the driving transistor T3. An invalid pulse of the third control signal may control the bias transistor T5 to be in an off state.
The gate of the second reset transistor T7 may be electrically connected to the fourth scan signal terminal SC_P2, the first terminal of the second reset transistor T7 may be electrically connected to the second reference voltage terminal Vref2, and the second terminal of the second reset transistor T7 may be electrically connected to the fourth node N4. The second reference voltage terminal Vref2 may be used for outputting a second reset signal for resetting the anode of the light-emitting element Q. The fourth scan signal terminal SC_P2 may be used for outputting a fourth control signal for controlling the second reset transistor T7. The fourth control signal may be a pulse signal. A valid pulse of the fourth control signal may control the second reset transistor T7 to be in an on state to reset the anode of the light-emitting element Q. An invalid pulse of the fourth control signal may control the second reset transistor T7 to be in an off state.
The gate of the threshold compensation transistor T4 may be electrically connected to a fifth scan signal terminal SC_N(n), the first terminal of the threshold compensation transistor T4 may be electrically connected to the third node N3, and the second terminal of the threshold compensation transistor T4 may be electrically connected to the first node N1. The fifth scan signal terminal SC_N(n) may be used for outputting a fifth control signal for controlling the threshold compensation transistor T4. The fifth scan signal terminal SC_N(n) may be a pulse signal. A valid pulse of the fifth control signal may control the threshold compensation transistor T4 to be in an on state to detect and self-compensate for the deviation of the threshold value voltage of the driving transistor T3. An invalid pulse of the fifth control signal may control the threshold compensation transistor T4 to be in an off state.
The first light-emitting control transistor T1 may be electrically connected to the second node N2, the first terminal of the second light-emitting control transistor T6 may be electrically connected to the third node N3, and the second terminal of the second light-emitting control transistor T6 may be electrically connected to the third node N4. The gate of the first light-emitting control transistor T1 and the gate of the second light-emitting control transistor T6 may both be electrically connected the light-emitting control signal terminal EM. The light-emitting control signal terminal EM may be used for outputting a light-emitting control signal for controlling the first light-emitting control transistor T1 and the second light-emitting control transistor T6. The light-emitting control signal may be a pulse signal. A valid pulse of the light-emitting control signal may control the first light-emitting control transistor T1 and the second light-emitting control transistor T6. At this time, the driving current may flow through the light-emitting element Q, and the light-emitting element Q may emit light in response to the driving current. An invalid pulse of the light-emitting control signal may control the first light-emitting control transistor T1 and the second light-emitting control transistor T6 to be in an off state.
It should be noted that the first terminal of the first light-emitting control transistor T1 may be electrically connected to a first power supply voltage terminal PVDD, and the second terminal of the first light-emitting control transistor T1 may be electrically connected to the second node N2. The anode of the light-emitting element Q may be electrically connected to the fourth node N4, and the cathode of the light-emitting element Q may be electrically connected to a second power supply voltage terminal PVEE.
It should be noted that the data writing transistor T2 may write the data signal Vdata to the gate of the driving transistor T3. At this time, both the data writing transistor T2 and the threshold compensation transistor T4 may be in the on state. When the first reset transistor T8 resets the gate of the driving transistor T3, the first reset transistor T8 and the threshold compensation transistor T4 may both be in the on state.
In some embodiments, the pixel circuit 12 further includes a capacitor C1. The first plate of the capacitor C1 may be electrically connected to the first power supply voltage terminal PVDD, and the second plate of the capacitor C1 may be electrically connected to the first node N1.
More specifically, in the embodiments of the present disclosure, the first reset transistor T8 may be used to reset the gate of the driving transistor T3, and the second reset transistor T7 may be used reset the anode of the light-emitting element Q. In the embodiments of the present disclosure, the control signal of the first reset transistor T8 and the control signal of the second reset transistor T7 can be the same, and the same group of shift register circuits can be used to control the first reset transistor T8 and the second reset transistor T7, thereby simplifying the number of wirings on the display panel.
In other words, the gate of the first reset transistor T8 and the gate of the second reset transistor T7 may be connected to the same scan signal terminal. The embodiments of the present disclosure take the gate of the first reset transistor T8 and the gate of the second reset transistor T7 being jointly connected to the second scan signal terminal SC_P(n−1) as an example for illustration.
The arrangement of each stage of the shift registers corresponding to one row of pixel circuits enables each stage of the shift registers to only provide signals to the transistors with the same function in one row, and does not provide signals to the transistors with the same function in other rows. The arrangement of each stage of the shift registers corresponding to two rows of pixel circuits enables each stage of the shift registers to provide the same signals to the transistors with the same function in two rows, but does not provide signals to the transistors with the same function in other rows.
In
In some embodiments, the control signal of the data writing transistor T2 and the control signal of the first reset transistor T8 may be provided by the first scan circuit SC C, the control signal of the threshold compensation transistor T4 may be provided by the second scan circuit SCN C, and the control signal of the bias transistor T5 may be provided by the third scan circuit SCP C.
In some embodiments, the light-emitting control module 13 may include a first light-emitting control transistor T1 and a second light-emitting control transistor T6. The control signals of the first light-emitting control transistor T1 and the second light-emitting control transistor T6 may be provided by the light emission control circuit Emit C.
More specifically, in the embodiments of the present disclosure, the first control signal for controlling the data writing transistor T2 and the second control signal for controlling the first reset transistor T8 may be provided by the first scan circuit SC C; the third control signal for controlling the bias transistor T5 may be provided by the second scan circuit SCN C; the fourth control signal for controlling the threshold compensation transistor T4 may be provided by the third scan circuit SCP C; and the light-emitting control signal for controlling the first light-emitting control transistor T1 and the second light-emitting control transistor T6 may be provided by the light emission control circuit Emit C.
In some embodiments, the shift registers included in the first scan circuit may be the first shift registers. A stage (e.g., a first stage or a current stage) of the shift register may provide the control signals for the data writing transistor T2 of the pixel circuit 12 in the current and provide the control signals for the first reset transistor T8 of the pixel circuit 12 in the next row. That is, the gate of the driving transistor T3 in the pixel circuit 12 of the next may be reset while the data signal Vdata is written in the pixel circuit 12 of the current row to fully reset the driving transistor T3 in the pixel circuit 12 of the next row to improve the reset effect of the gate of the driving transistor T3 in the pixel circuit 12 of the next row, thereby ensuring the signal stability of writing data signal Vdata to the gate of the driving transistor T3 by the pixel circuit 12 of the next row.
In some embodiments, the shift registers included in the second scan circuit may be the second shift registers. A stage (e.g., a first stage or a current stage) of the second shift register may provide the control signals for the threshold compensation transistor T4 of the pixel circuits located in the current two rows.
In some embodiments, the shift registers included in the third scan circuit may be the third shift registers. A stage (e.g., a first stage or a current stage) of the third shift register may provide the control signals for the bias transistor T5 of the pixel circuits located in the current two rows.
In some embodiments, the shift registers included in the light-emitting control circuit may be the fourth shift registers. A stage (e.g., a first stage or a current stage) of the fourth shift register may provide the control signals for the first light-emitting control transistor T1 and the second light-emitting control transistor T6 of the pixel circuits located in the current two rows.
In some embodiments, the enable duration of the control signal provided by the first shift register may be 1H, and the enable duration of the control signal provided by the second shift register may be greater than or equal to 6H, where H represents the unit clock time.
More specifically, in the embodiments of the present disclosure, the enable duration of the control signal provided by the first shift register may be 1H. That is, the effect duration that data writing transistor T2 of the pixel circuit 12 of the current row and the first reset transistor T8 of the pixel circuit 12 of the next row are in the on state may be 1H. The enable duration of the control signal provided by the second shift register may be greater than or equal to 6H. That is, the effective duration when the threshold compensation transistor T4 is in the on state may be greater than or equal to 6H, which ensures that the gate of the driving transistor T3 can be reset, the data signal Vdata can be written, and the deviation of the threshold voltage of the driving transistor T3 can be detected and self-compensated. In addition, the first stage of the second shift register may be set to correspond to two rows of pixel circuits.
More specifically, in the embodiments of the present disclosure, the enable duration of the control signal provided by the first shift register may be 1H. That is, the effect duration that data writing transistor T2 of the pixel circuit 12 of the current row and the first reset transistor T8 of the pixel circuit 12 of the next row are in the on state may be 1H. The enable duration of the control signal provided by the third shift register may be greater than or equal to 6H. That is, the effective duration when the bias transistor T5 is in the on state may be greater than or equal to 6H to fully bias the second terminal of the bias transistor T5, thereby improving the biasing effect of the bias transistor T5 and reducing the threshold shift of the bias transistor T5. In this way, the stability of the driving current generated by the bias transistor T5 can be improved, thereby improving the display effect of the display panel.
As shown in
More specifically, in the embodiments of the present disclosure, the first reset transistor T8 may be electrically connected to the gate of the driving transistor T3, and the transistor type of the first reset transistor T8 may be the same as the transistor type of the bias transistor T5. In this way, the control of the first reset transistor T8 and the bias transistor T5 may be realized at the same time through the same control signal. That is, the control signal of the first reset transistor T8 may be the same as the control signal of the bias transistor T5, such that when the gate of the driving transistor T3 is reset, the second terminal of the driving transistor T3 can also be biased.
That is, in the embodiments of the present disclosure, the bias transistor T5 and the first reset transistor T8 may be controlled by the same signal line to be in an on state or an off state, thereby reducing the number of signal lines in the display panel.
As shown in
Based on the foregoing embodiments, an embodiment of the present disclosure further provides a display panel driving method, which can be apply to the display panel provided in any of the foregoing embodiments of the present disclosure.
More specifically, in the embodiments of the present disclosure, in the first bias stage, the bias transistor may be turned on to provide a bias voltage to the second terminal of the driving transistor T3 to address the threshold shift of the driving transistor T3, and improve the stability of writing the data signal Vdata to the gate of the driving transistor T3 in the subsequent data writing stage. Based on the stable data signal Vdata and the biased driving transistor T3, the required driving current can be obtained, that is, the precision of driving current generated by the driving transistor T3 can be improved.
In the data writing stage, the data signal Vdata may be written to the gate of the driving transistor T3 through the data writing transistor T2, and the driving transistor T3 may generate a corresponding driving current based on the data signal Vdata. At the same time, the threshold compensation transistor T4 may also be in the on stage for detecting and self-compensating the deviation of the threshold voltage of the driving transistor T3, which can also improve the performance of the driving transistor T3 to improve the precision of driving current generated by the driving transistor T3, thereby improving the display effect of the display panel.
In the light-emitting stage, the light-emitting control module 13 may be turned on, the driving current generated by the driving transistor T3 may flow through the light-emitting element Q, and the light-emitting element Q may emit light in response to the driving current. Based on the high-precision driving current, the brightness required by the target can be achieved, thereby improving the display effect of the display panel.
S105, the working process of the pixel circuit 12 further includes a second biasing stage after the data writing stage and before the light-emitting stage, the bias transistor T5 is turned on to provide a biasing voltage to the second terminal of the driving transistor T3 in the second bias stage.
More specifically, in the embodiments of the present disclosure, after the writing of the data signal Vdata is completed and before the light-emitting stage, the second terminal of the driving transistor T3 may be biased again to improve the performance of the pixel circuit, such that the light-emitting element Q can achieved the required brightness in the light-emitting stage, thereby improving the display effect of the display panel.
In some embodiments, as shown in
More specifically, in the embodiments of the present disclosure, the enable duration of the threshold compensation transistor T4 receiving the control signal may be greater than or equal to 6H. That is, the effective duration of the threshold compensation transistor T4 being in the on state may be greater than or equal to 6H, which ensures that the gate of the driving transistor T3 can be reset, the data signal Vdata can be written, and the deviation of the threshold voltage of the driving transistor can be sufficiently detected and self-compensated.
In some embodiments, as shown in
More specifically, in the embodiments of the present disclosure, the enable duration of the bias transistor T5 receiving the control signal may be greater than or equal to 6H. That is, the effective duration of the bias transistor T5 being in the on state may be greater than or equal to 6H to sufficiently bias the second terminal of the driving transistor T3 in both the first bias stage and the second bias stage. In this way, the threshold shift of the driving transistor T3 can be avoided, and the stability of the driving current generated by the driving transistor T3 can be improved, thereby improving the display effect of the display panel.
In some embodiments, based on the foregoing embodiments of the present disclosure, an embodiment of the present disclosure further provides a display device.
The display device 100 may include any one of the display panels provided in the foregoing embodiments.
Since the display device 100 provided by the embodiment of the present disclosure can include any display panel provided in the foregoing embodiments, the display device 100 can have the same or corresponding technical effects as the display panel provided by the foregoing embodiments.
In some embodiments, the display device 100 may be a mobile phone, a computer, and other electronic devices, etc.
The display panel and a driving method thereof provided by the embodiments of the present disclosure have been described above in detail, and specific examples are used herein to illustrate the principle and embodiments of the present disclosure. The descriptions of the above-mentioned embodiments are only for facilitating the understanding of the method of the present disclosure and the core concept thereof; meanwhile, for a person of ordinary skill in the art, changes can be made in the Detailed Description and application range according to the concept of the present disclosure. In conclusion, the contents of the description should not be considered to limit the present disclosure.
Various embodiments of the present disclosure are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can refer to the description of the corresponding method parts.
In the present disclosure, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations having any such actual relationship or order among them. The terms “including,” “containing,” or any other variations thereof are intended to encompass non-exclusive inclusion, such that an item or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or may include elements inherent to such an item or device. Without more restrictions, the elements defined by the sentence “include a . . . ” do not exclude the existence of other identical elements in the item or device, which include the above elements.
The above description of the disclosed embodiments enables those skilled in the art to implement or use the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the disclosure. Therefore, the present disclosure will not be limited to the embodiments shown in the present specification but shall conform to the widest scope consistent with the principles and novel features disclosed in the present specification.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202211103061.1 | Sep 2022 | CN | national |
