Patent Grant
12051362
The present disclosure claims the priority of Chinese patent application No. 20210506675.8 filed on May 12, 2022 before the China National Intellectual Property Administration of the People's Republic of China, titled “driving circuit and driving method for display unit, and display device”. The entire contents of the patent application identified above is incorporated by reference herein as if fully set forth.
The present disclosure generally relates to the technical field of display panels, in particular to a driving circuit and a driving method for a display unit, and a display device.
With the development of related technologies, display technology has grown from a liquid crystal display (LCD) to a micro light emitting diode (micro-LED). A micro-LED array device refers to a two-dimensional array of a light emitting diode (LED) with a micro size and ultra-high density integrated on the same base, which has wide application fields, such as micro display equipment, life cell detection, and visible light communication. The micro-LED has higher brightness, better luminous efficiency, but lower power consumption than the LCD. A display effect of the micro-LED relates to a response speed of the micro-LED: the faster the response speed of the micro-LED, the better the display effect. In the related art, a low response speed of the micro-LED leads to an unsatisfactory display effect. Therefore, how to improve the response speed of the micro-LED has become a problem to be solved urgently.
In a first aspect, the disclosure provides a driving circuit for a display unit, comprising a light emitting circuit, a startup circuit, a control circuit and a storage circuit, wherein the control circuit is connected with the startup circuit, the light emitting circuit is connected with the display unit, the startup circuit is connected with the light emitting circuit, the storage circuit is connected with the startup circuit; wherein, the startup circuit of the display unit further comprises a pre-charging circuit and a signal output circuit.
The pre-charging circuit is connected with the storage circuit and configured to pre-charge the storage circuit when receiving a first pre-charging signal which is a pre-charging signal output by a target signal output circuit.
The signal output circuit is connected with the control circuit and configured to output a second pre-charging signal for turning on at least one of target pre-charging circuits to perform pre-charging when the control circuit turns on the startup circuit.
In a second aspect, the disclosure further provides a driving method for a display unit, which is applied to a driving circuit for a display unit comprising:
In a third aspect, the disclosure further provides a display device comprising: a substrate on which a plurality of sub-pixels are provided, wherein each of the sub-pixels comprises a display unit and a driving circuit for the display unit that is connected with the display unit, and the driving circuit for the display unit comprises: a light emitting circuit, a startup circuit, a control circuit and a storage circuit, wherein the control circuit is connected with the startup circuit, the light emitting circuit is connected with the display unit, the startup circuit is connected with the light emitting circuit, and the storage circuit is connected with the startup circuit, wherein, the driving circuit for the display unit further comprises: a pre-charging circuit connected with the storage circuit and configured to pre-charge the storage circuit when receiving a first pre-charging signal which is a pre-charging signal output by a target signal output circuit; and a signal output circuit connected with the control circuit and configured to output a second pre-charging signal for turning on at least one target pre-charging circuit to perform pre-charging when the control circuit turns on the startup circuit.
The driving circuit for a display unit provided by an embodiment of the disclosure comprises a light emitting circuit, a startup circuit, a control circuit and a storage circuit, wherein the control circuit is connected with the startup circuit, the light emitting circuit is connected with the display unit, the startup circuit is connected with the light emitting circuit, and the storage circuit is connected with the startup circuit; wherein, the driving circuit for the display unit further comprises: a pre-charging circuit connected with the storage circuit and configured to pre-charge the storage circuit when receiving a first pre-charging signal which is a pre-charging signal output by a target signal output circuit; and a signal output circuit connected with the control circuit and configured to output a second pre-charging signal for turning on at least one target pre-charging circuit to perform pre-charging when the control circuit turns on the startup circuit in the control circuit; by providing the pre-charging circuit in the driving circuit for the display unit and pre-charging the storage circuit according to the first pre-charging signal, a charging efficiency of the storage circuit is improved, and a response speed of the storage circuit is improved, achieving an effect of improving a response speed of the display unit, and improving a light emitting effect of the display unit; meanwhile, when a control circuit turns on the startup circuit, a second pre-charging signal is output by a signal output circuit to pre-charge at least one target pre-charging circuit, and when the current display unit is driven to emit light, the target pre-charging circuit corresponding to at least on display unit is charged, so as to pre-charge the display unit corresponding to the target pre-charging circuit, improving a charging efficiency of the display unit corresponding to the pre-charging circuit, and improving the response speed of the display unit corresponding to the target pre-charging circuit.
1—light emitting circuit; 2—startup circuit; 3—control circuit; 4—storage circuit; 5—pre-charging circuit; 6—signal output circuit; 61—trigger unit; 610—output end; 62—inverter; 7—display unit; 8—target pre-charging circuit; 9—driving circuit for a display unit; 10—substrate; 11—sub-pixel; C N—storage capacitor; T1—first thin film transistor; T2—second thin film transistor; T3—third thin film transistor; T4—fourth thin film transistor; C1—clock signal input end; D—input end; Q—first output end;
In order to more clearly describe the technical solution of embodiments of the present disclosure, the Detailed Description of the present disclosure will be described below with reference to the accompanying drawings. Apparently, the accompanying drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can obtain other accompanying drawings and other implementations based on these drawings without any creative effort.
For the sake of brevity, each figure only schematically shows the parts relevant to the disclosure, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically drawn, or only one of them is marked. Herein, “one” not only means “only one”, but also means “a plurality of”.
The disclosure will be described in further detail below in combination with the accompanying drawings and embodiments.
Referring to
The pre-charging circuit 5 is connected with the storage circuit 4, the pre-charging circuit 5 pre-charges the storage circuit 4 when receiving a first pre-charging signal which is a pre-charging signal output by the target signal output circuit 6.
The signal output circuit 6 is connected with the control circuit 3, and when the control circuit 3 turns on the startup circuit 2, the signal output circuit 6 outputs a second pre-charging signal for turning on at least one target pre-charging circuit 8 (shown in
It should be understood that the driving circuit 9 for the display unit in the present disclosure is disposed in a display device comprising a plurality of sub-pixels arranged in a matrix, and a plurality of the sub-pixels arranged in a matrix comprises pixels in a plurality of pixel rows and pixels in a plurality of pixel columns, wherein each pixel row comprises a plurality of sub-pixels, each sub-pixel comprises at least one display unit 7, each sub-pixel is charged and displayed from a first direction to a second direction in sequence, and the first direction and the second direction are opposite, that is, the display unit 7 in each pixel row is charged and displayed from the first direction to the second direction in sequence; wherein, the target pre-charging circuit 8 is the pre-charging circuit in a driving circuit corresponding to the display unit 7 in the second direction of the current display unit 7, for example, a pixel row comprises a plurality of display units 7, and the display units 7 in the pixel row are sorted in sequence from the first direction to the second direction, the current display unit 7 is the Nth display unit 7, and then the pre-charging circuit 5 is taken as the target pre-charging circuit 8 in the driving circuit corresponding to at least one display unit 7 among the (N+1)th, (N+2)th, (N+3)th, and (N+4)th display units 7; wherein, the target signal output circuit 6 is the signal output circuit 6 in the driving circuit corresponding to the display unit 7 in the first direction of the current display unit 7, for example, a pixel row comprises a plurality of display units 7, the display units 7 in the pixel row are sorted in sequence from the first direction to the second direction, the current display unit 7 is the Nth display unit 7, and then the signal output circuit 6 in the driving circuit corresponding to at least one display unit 7 among the (N−1)th, (N−2)th, (N−3)th, and (N−4)th display units 7 is the target signal output circuit 6;
Following the above example, that is, the target signal output circuit 6 is the signal output circuit 6 in the driving circuit 9 currently being charged of the display unit, and the target pre-charging circuit 8 is the pre-charging circuit 5 in the driving circuit 9 corresponding to at least one display unit 7 among N display units 7 after the current display unit 7.
It should be understood that, as shown in
In the above example, as shown in
As shown in
It should be understood that the embodiment does not limit types of the first, the second and the third thin film transistors T3, which can be flexibly set by relevant personnel. For example, the first, the second and the third thin film transistors T3 may be a P-type thin film transistor or an N-type thin film transistor; for example, the first, the second and the third thin film transistors T3 are all N-type thin film transistors and are turned on when the control end of the first thin film transistor T1 receives a high-level first scanning signal Scant, when the control end of the second thin film transistor T1 receives a high-level second scanning signal Scan2, and the control end of the third thin film transistor T3 receives a high-level signal.
In some examples of this embodiment, as shown in
in some examples, in the same pixel row, the fourth thin film transistors T4 in the driving circuits 9 for the adjacent display units are of opposite types; wherein, the opposite types mean that when one of the thin film transistors is a P-type thin film transistor, the other is a N-type thin film transistor; for example, in the same pixel row, the fourth thin film transistor T4 in the driving circuit 9 for the (N−1)th display unit is a P-type thin film transistor, the fourth thin film transistor T4 in the driving circuit 9 for the Nth display unit is a N-type thin film transistor, the fourth thin film transistor T4 in the driving circuit 9 for the (N+1)th display unit is a P-type thin film transistor, and so on.
In some examples, in the same pixel row, the fourth thin film transistors T4 in the driving circuits 9 for the adjacent two display units are of opposite type, for example, in a same pixel row, the fourth thin film transistor T4 in the driving circuit 9 for the N−1th display unit is a P-type thin film transistor, the fourth thin film transistor T4 in the driving circuit 9 for the Nth display unit is a P-type thin film transistor, the fourth thin film transistor T4 in the driving circuit 9 for the (N+1)th display unit is a N type thin film transistor, the fourth thin film transistor T4 in the driving circuit 9 for the (N+2)th display unit is a N-type thin film transistor, the fourth thin film transistor T4 in the driving circuit 9 for the (N+3)th display unit is a P-type thin film transistor, and so on.
In some examples, in the same pixel row, the fourth thin film transistor T4 in the driving circuit 9 for each display unit is of the same type.
In some examples of this embodiment, as shown in
It should be understood that the target pre-charging circuit 8 is the pre-charging circuit 5 in the driving circuit 9 for a display unit, wherein the target pre-charging circuit 8 is turned on, that is, the fourth thin film transistor T4 in the target pre-charging circuit 8 is turned on, so that the storage circuit 4 in the display unit 7 is pre-charged. In combination with the above description, it can be understood that the turn-on signal is the first scanning signal, thereby realizing reuse of the first scanning signal, and avoiding setting a signal for controlling pre-charging separately.
It should be understood that, in some examples, the trigger unit 61 outputs the second pre-charging signal when the control circuit 3 transmits the second scanning signal Scan2, for example, the trigger unit 61 is a flip-flop, an input end D of the flip-flop is connected with the control circuit 3, and the output end 610 is connected with at least one target pre-charging circuit 8. When the control circuit 3 transmits the second scanning signal Scan2 of first polarity, the second thin film transistor T2 is turned on, and when the target pre-charging circuit 8 is turned on by the second pre-charging signal of first polarity, in a case where the control circuit 3 transmits the second scanning signal Scan2 of first polarity, the flip-flop outputs the second pre-charging signal of first polarity; when the target pre-charging circuit 8 is not turned on by the second pre-charging signal of second polarity, in a case where the control circuit 3 transmits the second scanning signal Scan2 of first polarity, the flip-flop outputs the second pre-charging signal of second polarity. For another example, in order to make the trigger unit 61 more sensitive and faster, the trigger unit 61 can be a D flip-flop, and then the second scanning signal Scan2 is switched from second polarity to first polarity, the D flip-flop can be triggered directly at the moment of a rising edge occurring in a level signal. Thereby, it is not necessary to wait for the arrival of the second scanning signal Scan2 of first polarity before triggering can be performed when the level signal is switched from the second polarity to the first polarity during level triggering. Therefore, the trigger unit 61 adopts a D flip-flop, which does not need to wait for the arrival of the second scanning signal Scan2 of first polarity, which is more sensitive and faster than level triggering. It can be understood that the first polarity and the second polarity are opposite, for example, the first polarity is a high level, and the second polarity is a low level.
In some examples, as shown in
The second output end
Following the above example, the first output end Q and the second output end
Specifically, for example, the trigger unit 61 is a D flip-flop as shown in
In some examples of the embodiment, as shown in
Following the above example, for example, the trigger unit 61 is a D edge-triggered flip-flop, the clock signal input end C1 of the D edge-triggered flip-flop is connected with the control circuit 3, the first output end Q of the D edge-triggered flip-flop is connected with the fourth thin film transistor T4 corresponding to the (N+1)th display unit 7 and the fourth thin film transistor T4 corresponding to the (N+2)th display units 7, the fourth thin film transistors T4 corresponding to the (N+1)th display units 7 is an N-type thin film transistor, and the thin film transistor T4 corresponding to the (N+2)th display unit 7 is a P-type thin film transistor. When the control circuit 3 transmits a high-level scanning signal, the startup circuit 2 is turned on, an initial signal of the input end D of the D flip-flop is set as a high-level signal. As the D edge-triggered flip-flop detects a rising edge at the moment when the scanning signal transmitted by the control circuit 3 becomes a high level for the Nth time, that is, at the moment when the clock signal input end C1 receives the signal, the first output end Q outputs a high-level second pre-charging signal, thereby turning on the fourth thin film transistor T4 corresponding to the (N+1)th display unit 7 to perform pre-charging. The second output end
Following the above example, it can be understood that the second output end
In some examples of the embodiment, when the first output end Q is connected with at least two target pre-charging circuits 8 and at least one of the target pre-charging circuits 8 connected with the first output end Q is turned on by the second pre-charging signals of first polarity and second polarity, the second output end
The present embodiment provides a driving circuit 9 for a display unit, and the driving circuit 9 comprises a light emitting circuit 1, a startup circuit 2, a control circuit 3 and a storage circuit 4, wherein the control circuit 3 is connected with the startup circuit 2, the light emitting circuit 1 is connected with the display unit 7, the startup circuit 2 is connected with the light emitting circuit 1, and the storage circuit 4 is connected with the startup circuit 2. The driving circuit 9 for the display unit further comprises: a pre-charging circuit 5 and a signal output circuit 6, wherein the pre-charging circuit 5 is connected with the storage circuit 4 and is configured to pre-charge the storage circuit 4 when receiving a first pre-charging signal which is a pre-charging signal output by the target signal output circuit 6; the signal output circuit 6 is connected with the control circuit 3 and is configured to output a second pre-charging signal for turning on at least one target pre-charging circuit 8 to perform pre-charging when the control circuit 3 turns on the startup circuit 2. By providing the pre-charging circuit 5 in the driving circuit 9 for the display unit, and pre-charging the storage circuit 4 according to the first pre-charging signal, a charging efficiency of the storage circuit 4 is improved, and a response speed of the storage circuit 4 is improved, achieving an effect of improving a response speed of the display unit 7. By improving the response speed of display, a light emitting effect of the display unit 7 is improved. Meanwhile, when the control circuit 3 turns on the startup circuit 2, the second pre-charging signal is output by the signal output circuit 6 to pre-charge at least one target pre-charging circuit 8, when the current display unit 7 is driven to emit light, the target pre-charging circuit 8 corresponding to at least one display unit 7 is charged, so that the display unit 7 corresponding to the target pre-charging circuit 8 is pre-charged in advance, thereby improving charging efficiency of the display unit 7 corresponding to the target pre-charging circuit 8 and improving a response speed of the display unit 7 corresponding to the target pre-charging circuit 8.
In order to better understand the present disclosure, the embodiment provides a more specific example to illustrate the present disclosure. As shown in
The driving circuit for the display unit further comprises: a pre-charging circuit connected with the storage circuit and configured to pre-charge the storage circuit when receiving a first pre-charging signal which is a pre-charging signal output by the target signal output circuit; and
In some examples of this embodiment, the pre-charging circuit comprises a fourth thin film transistor, wherein a control end of the fourth thin film transistor is configured to receive the first pre-charging signal, a first end of the fourth thin film transistor is connected with an output circuit of a reference voltage, and a second end of the fourth thin film transistor is connected with the storage circuit. When the control end of the fourth thin film transistor receives the first pre-charging signal, the first end and the second end of the fourth thin film transistor are controlled to be connected to transmit the reference voltage to the storage circuit to pre-charge the storage circuit.
Wherein, the first thin film transistor, the second thin film transistor, and the third thin film transistor are all N-type thin film transistors, and types of the fourth thin film transistors of two adjacent display units are different. The fourth thin film transistor of the Nth display unit is a N-type thin film transistor, the fourth thin film transistor of the (N+1)th display unit is a N-type thin film transistor, the fourth thin film transistor of the (N+2)th display unit is a P-type thin film transistor, the fourth thin film transistor of the (N+3)th display unit is a P-type thin film transistor, and the fourth thin film transistor of the (N+4)th display unit is a N-type thin film transistor.
Wherein, the signal output circuit comprises a D edge-triggered flip-flop and an inverter, the clock signal input end C1 of the D edge-triggered flip-flop is connected with the control circuit, the first output end Q of the D edge-triggered flip-flop is connected with the fourth thin film transistors of the (N+1)th display unit and the (N+3)th display unit respectively and is also connected with the input end D of the inverter, the output end 610 of the inverter is connected with an input end DD of the D edge-triggered flip-flop, and the second output end {circumflex over (Q)} is connected with the fourth thin film transistors of the (N+2)th display unit and the (N+4)th display unit respectively.
Before T1 is turned on, the first pre-charging signal output by the (N−1)th display unit first controls the fourth thin film transistor of the Nth display unit to be turned on for a period of time to pre-charge the capacitor C N to the reference voltage Va; when T1 is turned on by the first scanning signal, Vdata of the Nth column reaches the C N, the time for Vdata to charge the capacitor is reduced, and the voltage of the C N is Vdata+Va, thereby improving a response speed of the display unit and a speed of emitting light of the display unit; when T2 is turned on, the voltage on the C N reaches T3, and the display unit emits light.
When the control circuit transmits a high-level scanning signal and turns on T2, an initial signal of the input end D of the D flip-flop is set to be a high-level signal. Since the D edge-triggered flip-flop detects a rising edge at the moment when the scanning signal transmitted by the control circuit becomes a high level for the Nth time, that is, at the moment when the clock signal input end C1 receives the signal, the first output end Q outputs a high-level second pre-charging signal to turn on the fourth thin film transistor corresponding to the (N+1)th display unit is to perform pre-charging; the second output end
The driving circuit for the display unit provided in this embodiment realizes pre-charging of four display units by one flip-flop, thereby improving the response speed of at least two display units, improving a charging rate of the display unit, and effectively improving the response speed, which has the effect of improving the display effect. Moreover, the present disclosure adopts a rising edge-triggered D flip-flop, so that the flip-flop starts operation before a high level arrives, and the rising edge trigger is more sensitive and quicker than the level trigger.
An embodiment of the present disclosure provides a driving method for a display unit, and the method is applied to any one of the driving circuits for the display unit described above. As shown in
S101: receiving a first pre-charging signal and pre-charging a storage circuit according to the first pre-charging signal;
S102: when the control circuit turns on the startup circuit, outputting a second pre-charging signal configured to turn on at least one target pre-charging circuit to perform pre-charging.
It should be understood that the above-driving method for a display unit is applied to a driving circuit for the display unit, and the driving circuit for the display unit comprises a light emitting circuit, a startup circuit, a control circuit, and a storage circuit, wherein the control circuit is connected with the startup circuit, the light emitting circuit is connected with the display unit, the startup circuit is connected with the light emitting circuit, and the storage circuit is connected with the startup circuit. The driving circuit for the display unit further comprises a pre-charging circuit connected with the storage circuit and configured to pre-charge the storage circuit when receiving a first pre-charging signal which is the pre-charging signal output by a target signal output circuit, and a signal output circuit connected with the control circuit and configured to output a second pre-charging signal for turning on at least one target pre-charge circuit to perform pre-charging when the control circuit turns on the startup circuit. By setting a pre-charging circuit in the startup circuit of the display unit and pre-charging the storage circuit according to the first pre-charging signal, charging efficiency of the storage circuit is improved, thereby improving a response speed of the storage circuit, which achieves the effect of improving the response speed of the display unit, thereby improving the light emitting effect of the display unit. Meanwhile, when the control circuit turns on the startup circuit, the second pre-charging signal is output by the signal output circuit to pre-charge at least one target pre-charging circuit, and when the current display unit is driven to emit light, the target pre-charging circuit corresponding to at least one display unit is charged to pre-charge the display unit corresponding to the target pre-charging circuit in advance, which improves the charging efficiency of the display unit corresponding to the target pre-charging circuit, and improves the response speed of the display unit corresponding to the target pre-charging circuit.
An embodiment of the present disclosure provides a display device. As shown in
In some examples of the present disclosure, the display unit 7 comprises a red light display unit 7, a green light display unit 7 and a blue light display unit 7; alternatively, the display unit 7 comprises a red light display unit 7, a green light display unit 7, a blue light display unit 7 and a yellow light display unit 7; alternatively, the display unit 7 comprises a red light display unit 7, a green light display unit 7, a blue light display unit 7 and a white light display unit 7; the type of the display unit 7 comprises but is not limited to a micro-LED display unit 7.
As shown in
The memory 113 is configured to store a computer program.
In an embodiment of the disclosure, when executing the program stored in the memory 113, the processor 111 is configured to implement the steps of the driving method for the display unit provided in any one of the foregoing method embodiments.
An embodiment of the present disclosure further provides a computer-readable storage medium on which a computer program is stored. When executed by a processor, the computer program implements the steps of the driving method for the display unit as provided in any one of the foregoing method embodiments.
It should also be noted that the term “comprises”, “comprising” or any other variants thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus comprising a series of elements comprises not only those elements, but also comprises other elements not expressly listed, or elements inherent in the process, method, article, or apparatus. Without further limitations, an element defined by the phrase “comprising a . . . ” does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the elements.
The above are only examples of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, various modifications and changes may occur in the disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be comprised within the scope of the appended claims of the present disclosure.
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| 202210506675.8 | May 2022 | CN | national |
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