CN116153255B - Display driving circuit and display panel - Google Patents

Abstract

The present application discloses a display driving circuit and a display device, wherein the display driving circuit includes a pixel driving circuit of the current level and a pixel driving circuit of the previous preset level, wherein the pixel driving circuit of the current level includes: a first thin film transistor and a second thin film transistor; a light emitting control circuit of the current level, wherein the controlled end is used to access the light emitting control signal of the current level, the first input end is used to access the power supply voltage, the second input end is connected to the output end of the second thin film transistor, the first output end is connected to the input end of the second thin film transistor, and the second output end is connected to the anode of the first self-luminous device; the controlled end of the light emitting control circuit of the current level is also connected to the pixel driving circuit of the previous preset level, so as to access the compensation signal output by the pixel driving circuit of the previous preset level before the potential of the light emitting control signal of the current level changes to the first preset potential, so as to charge the parasitic capacitance formed at the controlled end of the light emitting control circuit of the current level. The technical solution of the present application can reduce the influence of the parasitic capacitance on the self-luminous device.

Description

Display driving circuit and display panel

Technical Field

The present application relates to the field of display driving technology, and in particular to a display driving circuit and a display panel.

Background Art

At present, self-luminous panels are widely used because they use self-luminous devices such as OLED as pixels, which can achieve better display effects than liquid crystal panels. However, the existing display driving circuits used to drive the self-luminous devices to emit light will generate more parasitic capacitance during actual settings, thereby affecting the light emission speed of the self-luminous devices.

Summary of the invention

The main purpose of the present application is to provide a display driving circuit, aiming to solve the problem that parasitic capacitance affects the light emission of a self-luminous device.

To achieve the above-mentioned object, the display driving circuit proposed in the present application is applied to a self-luminous display panel, wherein the self-luminous display panel includes a first self-luminous device, and the display driving circuit includes a current-level pixel driving circuit and a previous-preset-level pixel driving circuit, wherein the current-level pixel driving circuit includes:

A first thin film transistor, a controlled end for receiving a gate drive signal of the current stage, and an input end for receiving a first data voltage;

A second thin film transistor, a controlled end connected to the output end of the first thin film transistor, an input end connected to a power supply voltage, and an output end connected to the anode of the first self-luminous device;

The light emitting control circuit of this stage, the controlled end is used to access the light emitting control signal of this stage, the first input end is used to access the power supply voltage, the second input end is connected to the output end of the second thin film transistor, the first output end is connected to the input end of the second thin film transistor, and the second output end is connected to the anode of the first self-luminous device;

The controlled end of the current-stage light-emitting control circuit is also connected to the previous-preset-stage pixel driving circuit so that before the potential of the current-stage light-emitting control signal changes to the first preset potential, a compensation signal output by the previous-preset-stage pixel driving circuit is connected to charge the parasitic capacitance formed at the controlled end of the current-stage light-emitting control circuit.

Optionally, the pre-preset-level pixel driving circuit includes:

A third thin film transistor, the controlled end is used to receive the gate drive signal of the previous preset level, and the input end is used to receive the data voltage;

a fourth thin film transistor, wherein a controlled end is connected to the output end of the third thin film transistor, an input end is connected to a power supply voltage, and an output end is connected to the anode of the second self-luminous device;

A pre-set level light emitting control circuit, wherein the controlled end is used to access the pre-set level light emitting control signal, the first input end is used to access the power supply voltage, the second input end is connected to the output end of the fourth thin film transistor, the first output end is connected to the input end of the fourth thin film transistor, and the second output end is connected to the anode of the second self-luminous device; wherein the first output end and/or the second input end are also connected to the controlled end of the current level light emitting control circuit;

The pre-preset level light-emitting control circuit is used to output the power supply voltage to the input end of the fourth thin-film transistor when the pre-preset level light-emitting control signal is at a first preset potential, and to output the power supply voltage output from the output end of the fourth thin-film transistor to the second self-luminous device, so as to drive the second self-luminous device to emit light.

Optionally, when the first output terminal of the previous preset stage light emitting control circuit is connected to the controlled terminal of the current stage light emitting control circuit, the previous preset stage pixel driving circuit further includes:

The first charge control circuit is arranged between the first output terminal of the previous preset level light control circuit and the controlled terminal of the current level light control circuit, the controlled terminal of the first charge control circuit is used to access the control signal, and the first charge control circuit is used to control the on and off of the first output terminal of the previous preset level light control circuit and the controlled terminal of the current level light control circuit according to the potential of the control signal.

Optionally, when the second input terminal of the previous preset stage light emitting control circuit is connected to the controlled terminal of the current stage light emitting control circuit, the previous preset stage pixel driving circuit further includes:

The second charge control circuit is arranged between the second input terminal of the previous preset level light control circuit and the controlled terminal of the current level light control circuit, the controlled terminal of the second charge control circuit is used to access the control signal, and the first charge control circuit is used to control the on and off of the second input terminal of the previous preset level light control circuit and the controlled terminal of the current level light control circuit according to the potential of the control signal.

Optionally, the light-emitting stage of the second self-luminous device includes a first stage, a second stage and a third stage performed sequentially;

In the first stage, the gate driving signal of the previous preset stage is at a first preset potential, the light emitting control signal of the previous preset stage is at a second preset potential, and the control signal is at a second preset potential;

In the second stage, the gate driving signal of the previous preset stage is at a second preset potential, the light emitting control signal of the previous preset stage is at a first preset potential, and the control signal is at a second preset potential;

In the third stage, the gate driving signal of the previous preset level is at the second preset potential, the light emitting control signal of the previous preset level is at the second preset potential, and the control signal is at the first preset potential.

The present application discloses a display driving circuit, which is applied to a self-luminous display panel. The self-luminous display panel includes a first self-luminous device. The display driving circuit includes a current-level pixel driving circuit and a previous preset-level pixel driving circuit. The display driving circuit includes:

A first thin film transistor, a controlled end for receiving a gate drive signal of the current stage, and an input end for receiving a first data voltage;

A second thin film transistor, a controlled end connected to the output end of the first thin film transistor, an input end connected to a power supply voltage, and an output end connected to the anode of the first self-luminous device;

A charging control circuit, wherein a controlled end is connected to the pre-set pixel driving circuit, an input end is used to access a preset voltage, and an output end is connected to the second thin film transistor;

The charging control circuit is used to output a preset voltage to the second thin film transistor when the pre-preset level pixel driving circuit receives a pre-preset level light emitting control signal at a first preset potential, so as to charge the parasitic capacitance formed by the second thin film transistor.

Optionally, the display driving circuit further includes:

a light-emitting control circuit at this stage, wherein the controlled end is used to access the light-emitting control signal at this stage, the first input end is used to access the power supply voltage, the second input end is connected to the output end of the second thin-film transistor, the first output end is connected to the input end of the second thin-film transistor, and the second output end is connected to the anode of the first self-luminous device;

The current-stage light-emitting control circuit is used to output the power supply voltage to the input end of the second thin-film transistor when the current-stage light-emitting control signal is at a first preset potential, and to output the power supply voltage output from the output end of the second thin-film transistor to the first self-luminous device, so as to drive the first self-luminous device to emit light.

Optionally, the preset voltage includes a first preset voltage, and the charging control circuit includes:

The first charging control circuit has a controlled end for receiving the light emitting control signal of the previous preset level, an input end for receiving the first preset voltage, and an output end connected to the controlled end of the second thin film transistor.

Optionally, the preset voltage further includes a second preset voltage, and the charging control circuit includes:

The second charging control circuit has a controlled end for receiving the light emitting control signal of the previous preset level, an input end for receiving the second preset voltage, and an output end connected to the input end of the second thin film transistor.

The present application also proposes a display panel, characterized in that the display panel comprises:

a first self-luminous device; and

As the display driving circuit mentioned above, the display driving circuit is connected to the first self-luminous device.

The present application connects the controlled end of the current-level light-emitting circuit to the previous-preset-level pixel driving circuit to synchronously access the previous-preset-level light-emitting control signal received when the previous-preset-level pixel driving circuit is working. Since the timing stage of the previous-preset-level light-emitting control signal is in the first preset potential before the first self-luminous device emits light, the preset voltage can be connected before the first self-luminous device emits light to raise the potential of the corresponding port of the second thin-film transistor, so as to charge the parasitic capacitance at the corresponding port of the second thin-film transistor in advance. Among them, the preset voltage can be obtained by the power management integrated circuit or by the output of a dedicated voltage generating circuit. In this way, the potential rise time at the corresponding port of the second thin-film transistor can be avoided from being affected by the parasitic capacitance, thereby improving the light-emitting time and effect of the first self-luminous device, thereby solving the problem of parasitic capacitance affecting the light-emitting time and effect of the self-luminous device, which is conducive to the high refresh rate design of the self-luminous display.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

FIG1 is a schematic diagram of a module structure of a display driving circuit according to a first embodiment of the present application;

FIG2 is a schematic diagram of a circuit structure of a display driving circuit according to a first embodiment of the present application;

FIG3 is a schematic diagram of the signal timing of the related signals in FIG2 ;

FIG4 is a schematic diagram of a module structure of a display driving circuit according to a second embodiment of the present application;

FIG. 5 is a schematic diagram of the circuit structure of a display driving circuit according to a second embodiment of the present application.

Description of Figure Numbers:

The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

Embodiment 1

The present application provides a display driving circuit which can be applied to a self-luminous display panel.

The self-luminous display panel may include a plurality of self-luminous devices and a multi-channel pixel driving circuit arranged in an array; each pixel driving circuit is arranged corresponding to a self-luminous device to drive the corresponding self-luminous device to emit light; wherein the self-luminous device may be implemented by an organic light-emitting device such as an OLED, which will not be described in detail here. This specification takes one of the pixel driving circuits as the current-level pixel driving circuit 100, and the corresponding self-luminous device driven by it is the first self-luminous device OLED1 as an example for explanation. It can be understood that the self-luminous device corresponding to the pre-preset-level pixel driving circuit 200 may be the second self-luminous device OLED2; the second self-luminous device OLED2 may be located in the same column as the first self-luminous device OLED1 in the self-luminous device array, and when the self-luminous device array displays the current frame, the second self-luminous device OLED2 may emit light before the first self-luminous device OLED1. In Figures 2 and 4, the pre-preset level is the previous level, and the following specification uses the pre-preset level as the previous level for explanation. Of course, in actual applications, the pre-preset level may also be the first two levels or the first three levels, etc., which are not limited here.

1 to 2, the pixel driving circuit 100 at this stage includes:

The first thin film transistor T1, the controlled end is used to receive the gate drive signal Scan N of this stage, and the input end is used to receive the data voltage Data;

A second thin film transistor T2, a controlled end connected to the output end of the first thin film transistor T1, an input end connected to the power supply voltage VDD, and an output end connected to the anode of the first self-luminous device OLED1;

The controlled end of the current-stage light-emitting control circuit 110 is also connected to the previous-preset-stage pixel driving circuit 200, so as to access the compensation signal output by the previous-preset-stage pixel driving circuit 200 before the potential of the current-stage light-emitting control signal Emit N changes to the first preset potential, so as to charge the parasitic capacitance formed at the controlled end of the current-stage light-emitting control circuit 110.

In this embodiment, the controlled end of the first thin film transistor T1 can be connected to the gate driving circuit to access the current-stage gate driving signal Scan N output by the gate driving circuit; the current-stage gate driving signal Scan N can have a first preset potential and a second preset potential, one of which can be a high potential and the other can be a low potential; wherein the first preset potential is used to trigger the first thin film transistor T1 to turn on, and the second preset potential is used to trigger the first thin film transistor T1 to turn off. This embodiment is explained by assuming that the first thin film transistor T1 and the second thin film transistor T2 are N-type thin film transistors, the first preset potential is a high potential, and the second preset potential is a low potential.

The cathode of the first self-luminous device OLED1 can be connected to the ground voltage Vss, and the first storage capacitor Cst1 can be connected between the cathode of the first self-luminous device OLED1 and the controlled end of the second thin film transistor T2. The gate driving circuit can determine that when the driving circuit is working at the level where the first self-luminous device OLED1 is located, it outputs the first preset potential of the current level gate driving signal Scan N to the first thin film transistor T1 to trigger the first thin film transistor T1 to turn on, so that the turned-on first thin film transistor T1 can be connected to the data voltage Data output by the source driving circuit and output to the first storage capacitor Cst1, so as to pre-charge the first storage capacitor Cst1, and after the pre-charging of the first storage capacitor Cst1 is completed, the terminal voltage of the first storage capacitor Cst1 can be used to trigger the second thin film transistor T2 to turn on.

The current-stage light-emitting control circuit 110 may include a fifth thin-film transistor T5 and a sixth thin-film transistor T6, the controlled ends of the fifth thin-film transistor T5 and the sixth thin-film transistor T6 may both be connected to the current-stage light-emitting control signal Emit N, the input end of the fifth thin-film transistor T5 may be connected to the power supply voltage VDD, the output end of the fifth thin-film transistor T5 may be connected to the input end of the second thin-film transistor T2, the input end of the sixth thin-film transistor T6 may be connected to the output end of the second thin-film transistor T2, and the output end of the sixth thin-film transistor T6 may be connected to the anode of the first self-luminous device OLED1. The current-stage light-emitting control signal Emit N may be generated and output by a timing controller or a dedicated control circuit, and the current-stage light-emitting control signal Emit N may also have a first preset potential and a second preset potential, wherein the first preset potential is used to trigger the fifth thin-film transistor T5 and the sixth thin-film transistor T6 to turn on, and the second preset potential is used to trigger the fifth thin-film transistor T5 and the sixth thin-film transistor T6 to turn off. This embodiment is explained by assuming that the fifth thin-film transistor T5 and the sixth thin-film transistor T6 are both N-type thin-film transistors. When the second thin film transistor T2 is turned on, the current-stage light-emitting control signal Emit N can change from the second preset potential to the first preset potential, so as to trigger the fifth thin film transistor T5 and the sixth thin film transistor T6 to turn on, so that the turned-on fifth thin film transistor T5 can output the power supply voltage VDD to the second thin film transistor T2, and the turned-on second thin film transistor T2 and the sixth thin film transistor T6 can output to the anode of the first self-luminous device OLED1, so as to achieve driving the first self-luminous device OLED1 to emit light. However, in the actual setting, it is found that there are many parasitic capacitors at the controlled end of the current-stage light-emitting control circuit 110, so that the parasitic capacitor will be charged in the process of the potential of the controlled end of the current-stage light-emitting control circuit 110 rising from the second preset potential to the first preset potential, thereby causing the potential rise time of the controlled end of the current-stage light-emitting control circuit 110 to rise from the second preset potential to the first preset potential to be longer, thereby causing the light-emitting time of the first self-luminous device OLED1 to be shorter, which is not conducive to the high refresh rate design of the self-luminous display.

The present application connects the controlled end of the current-stage light-emitting circuit to the previous-stage pixel driving circuit 200 to access the compensation signal formed by the shared charge when the previous-stage pixel driving circuit 200 drives the second self-luminous device OLED2 to work. Since the timing of the previous-stage pixel driving circuit 200 outputting the compensation signal is before the potential of the current-stage light-emitting control signal Emit N is transformed into the first preset potential, the potential of the controlled end of the current-stage light-emitting control circuit 110 can be raised before the potential of the current-stage light-emitting control signal Emit N is transformed into the first preset potential, so as to charge the parasitic capacitance at the controlled end of the current-stage light-emitting control circuit 110 in advance. In this way, the potential rise time of the controlled end of the current-stage light-emitting control circuit 110 can be avoided from being affected by the parasitic capacitance, thereby increasing the light-emitting time of the first self-luminous device OLED1, thereby solving the problem of the parasitic capacitance affecting the light-emitting time of the self-luminous device, which is beneficial to the high refresh rate design of the self-luminous display.

2 , the pre-preset-level pixel driving circuit 200 includes:

A third thin film transistor T3, a controlled end is used to receive a previous preset level gate drive signal Scan N-1, and an input end is used to receive a data voltage Data;

A fourth thin film transistor T4, whose controlled end is connected to the output end of the third thin film transistor T3, whose input end is connected to the power supply voltage VDD, and whose output end is connected to the anode of the second self-luminous device OLED2;

A pre-set stage light emitting control circuit 210, wherein the controlled end is used to access the pre-set stage light emitting control signal Emit N-1, the first input end is used to access the power supply voltage VDD, the second input end is connected to the output end of the fourth thin film transistor T4, the first output end is connected to the input end of the fourth thin film transistor T4, and the second output end is connected to the anode of the second self-luminous device OLED2; wherein the first output end and/or the second input end are also connected to the controlled end of the current stage light emitting control circuit 110;

The pre-preset level light-emitting control circuit 210 is used to output the power supply voltage VDD to the input end of the fourth thin film transistor T4 when the pre-preset level light-emitting control signal Emit N-1 is at a first preset potential, and output the power supply voltage VDD outputted from the output end of the fourth thin film transistor T4 to the second self-luminous device OLED2, so as to drive the second self-luminous device OLED2 to emit light.

In this embodiment, the controlled end of the third thin film transistor T3 can be connected to the gate driving circuit to access the pre-preset gate driving signal Scan N-1 output by the gate driving circuit; the pre-preset gate driving signal Scan N-1 can also have a first preset potential and a second preset potential; wherein the first preset potential is used to trigger the third thin film transistor T3 to turn on, and the second preset potential is used to trigger the third thin film transistor T3 to turn off. This embodiment is explained by assuming that the third thin film transistor T3 and the fourth thin film transistor T4 are N-type thin film transistors.

The cathode of the second self-luminous device OLED2 can be connected to the ground voltage Vss, and a second storage capacitor Cst2 can be connected between the cathode of the second self-luminous device OLED2 and the controlled end of the fourth thin film transistor T4. The gate driving circuit can determine that when the drive is working at the level where the second self-luminous device OLED2 is located, the pre-preset level gate driving signal ScanN-1 of the first preset potential is output to the third thin film transistor T3 to trigger the third thin film transistor T3 to turn on, so that the turned-on third thin film transistor T3 can be connected to the data voltage Data output by the source driving circuit and output to the second storage capacitor Cst2 to pre-charge the second storage capacitor Cst2, and after the pre-charging of the second storage capacitor Cst2 is completed, the terminal voltage of the second storage capacitor Cst2 can be used to trigger the fourth thin film transistor T4 to turn on.

The pre-preset level light emitting control circuit 210 may include a seventh thin film transistor T7 and an eighth thin film transistor T8, the controlled ends of the seventh thin film transistor T7 and the eighth thin film transistor T8 may both be connected to the pre-preset level light emitting control signal Emit N-1, the input end of the seventh thin film transistor T7 may be connected to the power supply voltage VDD, the output end of the seventh thin film transistor T7 may be connected to the input end of the fourth thin film transistor T4, the input end of the eighth thin film transistor T8 may be connected to the output end of the second thin film transistor T2, and the output end of the eighth thin film transistor T8 may be connected to the anode of the second self-luminous device OLED2. The pre-preset level light emitting control signal Emit N-1 may be generated and output by a timing controller or a dedicated control circuit, and the pre-preset level light emitting control signal Emit N-1 may also have a first preset potential and a second preset potential, wherein the first preset potential is used to trigger the seventh thin film transistor T7 and the eighth thin film transistor T8 to turn on, and the second preset potential is used to trigger the seventh thin film transistor T7 and the eighth thin film transistor T8 to turn off. This embodiment is explained by assuming that the seventh thin film transistor T7 and the eighth thin film transistor T8 are both N-type thin film transistors. When the fourth thin film transistor T4 is turned on, the previous preset level light emitting control signal Emit N-1 can change from the second preset potential to the first preset potential to trigger the seventh thin film transistor T7 and the eighth thin film transistor T8 to be turned on, so that the turned-on seventh thin film transistor T7 can output the power supply voltage VDD to the fourth thin film transistor T4, and the turned-on fourth thin film transistor T4 and the eighth thin film transistor T8 can output it to the anode of the second self-luminous device OLED2, thereby driving the second self-luminous device OLED2 to emit light.

In the embodiment shown in FIG. 2 , the first output terminal and the second output terminal of the previous preset stage light emitting control circuit 210 are both connected to the controlled end of the current stage light emitting control circuit 110 to enhance the compensation signal formed by the shared charge, which is beneficial to further reduce the influence of parasitic capacitance on the potential rise time of the controlled end of the current stage light emitting control circuit 110.

In this embodiment, by connecting at least one of the first output terminal and the second output terminal of the previous preset stage light emitting control circuit 210 to the controlled terminal of the current stage light emitting control circuit 110, the power supply voltage VDD output by the seventh thin film transistor T7 and/or the fourth thin film transistor T4 is output as a compensation signal, thereby achieving the potential of the controlled terminal of the current stage light emitting control circuit 110 being raised before the potential of the current stage light emitting control signal Emit N is converted to the first preset potential.

However, in actual use, it is found that if at least one of the first output terminal and the second output terminal of the previous preset level light-emitting control circuit 210 is directly connected to the controlled end of the current level light-emitting control circuit 110, the driving current of the second self-luminous device OLED2 will be smaller due to the shared charge, thereby affecting the light brightness of the second self-luminous device OLED2.

To address this problem, in the present application, when the first output terminal of the pre-preset-stage light emitting control circuit 210 is connected to the controlled terminal of the current-stage light emitting control circuit 110, the pre-preset-stage pixel driving circuit 200 further includes:

The first charge control circuit 220 is arranged between the first output terminal of the previous preset level light emitting control circuit 210 and the controlled terminal of the current level light emitting control circuit 110. The controlled terminal of the first charge control circuit 220 is used to access the control signal S. The first charge control circuit 220 is used to control the on-off of the first output terminal of the previous preset level light emitting control circuit 210 and the controlled terminal of the current level light emitting control circuit 110 according to the potential of the control signal S.

When the second input terminal of the pre-preset-stage light emitting control circuit 210 is connected to the controlled terminal of the current-stage light emitting control circuit 110, the pre-preset-stage pixel driving circuit 200 further includes:

The second charge control circuit 230 is arranged between the second input terminal of the previous preset level light emitting control circuit 210 and the controlled terminal of the current level light emitting control circuit 110. The controlled terminal of the second charge control circuit 230 is used to access the control signal S. The first charge control circuit 220 is used to control the on-off of the second input terminal of the previous preset level light emitting control circuit 210 and the controlled terminal of the current level light emitting control circuit 110 according to the potential of the control signal S.

In this embodiment, the first charge pump control circuit may include a ninth thin film transistor T9, and the second charge pump control circuit may include a tenth thin film transistor T10; this embodiment is explained by assuming that the ninth thin film transistor T9 and the tenth thin film transistor T10 are N-type thin film transistors. The ninth thin film transistor T9 may connect the first output terminal of the previous preset stage light emitting control circuit 210 with the controlled terminal of the current stage light emitting control circuit 110 when the previous preset stage light emitting control signal Emit N-1 is at the first preset potential; and disconnect the first output terminal of the previous preset stage light emitting control circuit 210 from the controlled terminal of the current stage light emitting control circuit 110 when the previous preset stage light emitting control signal Emit N-1 is at the second preset potential. The tenth thin film transistor T10 can connect the second input terminal of the previous preset stage light emitting control circuit 210 with the controlled terminal of the current stage light emitting control circuit 110 when the previous preset stage light emitting control signal Emit N-1 is at the first preset potential; and disconnect the connection between the second input terminal of the previous preset stage light emitting control circuit 210 and the controlled terminal of the current stage light emitting control circuit 110 when the previous preset stage light emitting control signal EmitN-1 is at the second preset potential.

3 , the light emitting stage of the second self-luminous device OLED2 includes a first stage T1, a second stage T2 and a third stage T3 which are performed sequentially;

In the first stage T1, the pre-preset stage gate driving signal Scan N-1 is at a first preset potential, the pre-preset stage light emitting control signal Emit N-1 is at a second preset potential, and the control signal S is at a second preset potential. In this stage, the third thin film transistor T3 is turned on, and the seventh thin film transistor T7, the eighth thin film transistor T8, the ninth thin film transistor T9 and/or the tenth thin film transistor T10 are turned off.

In the second stage T2, the pre-preset stage gate drive signal Scan N-1 is at the second preset potential, the pre-preset stage light emitting control signal Emit N-1 is at the first preset potential, and the control signal S is at the second preset potential. In this stage, the fourth thin film transistor T4, the seventh thin film transistor T7, and the eighth thin film transistor T8 are turned on, the third thin film transistor T3, the ninth thin film transistor T9, and/or the tenth thin film transistor T10 are turned off, and the second light emitting device emits light.

In the third stage T3, the pre-preset gate drive signal Scan N-1 is at the second preset potential, the pre-preset light emitting control signal Emit N-1 is at the second preset potential, and the control signal S is at the first preset potential. In this stage, the third thin film transistor T3, the seventh thin film transistor T7 and the eighth thin film transistor T8 are turned off, and the ninth thin film transistor T9 and/or the tenth thin film transistor T10 are turned on.

In actual application, it is found that there are also many parasitic capacitors at the output ends of the seventh thin film transistor T7 and the fourth thin film transistor T4, and the parasitic capacitors will be fully charged by the power supply voltage VDD in the second stage T2. Therefore, the technical solution of the present application controls the ninth thin film transistor T9 and/or the tenth thin film transistor T10 to be turned on in the third stage T3, so as to release the charge stored in the parasitic capacitor at the output end of the seventh thin film transistor T7 and/or the fourth thin film transistor T4 to form a compensation signal output, thereby not only achieving the potential of the controlled end of the current stage light emitting control circuit 110 before the potential of the current stage light emitting control signal Emit N is converted to the first preset potential, but also avoiding the generation of the compensation signal to affect the light emitting effect of the second self-luminous device OLED2.

Embodiment 2

The present application provides a display driving circuit which can be applied to a self-luminous display panel.

The self-luminous display panel may include a plurality of self-luminous devices arranged in an array and a plurality of pixel driving circuits; each pixel driving circuit is arranged corresponding to a self-luminous device to drive the corresponding self-luminous device to emit light; wherein the self-luminous device may be implemented by an organic light-emitting device such as an OLED, which will not be described in detail here. This specification takes one of the pixel driving circuits as the pixel driving circuit 100 of this level, and the corresponding self-luminous device driven by it is the first self-luminous device OLED1 as an example for explanation. It can be understood that the self-luminous device corresponding to the pre-set level pixel driving circuit 200 may be the second self-luminous device OLED2; the second self-luminous device OLED2 may be located in the same column as the first self-luminous device OLED1 in the self-luminous device array, and when the self-luminous device array displays the current frame, the second self-luminous device OLED2 may emit light before the first self-luminous device OLED1.

4 , the pixel driving circuit 100 at this stage includes:

The first thin film transistor T1, the controlled end is used to receive the gate drive signal Scan N of this stage, and the input end is used to receive the data voltage Data;

A second thin film transistor T2, a controlled end connected to the output end of the first thin film transistor T1, an input end connected to the power supply voltage VDD, and an output end connected to the anode of the first self-luminous device OLED1;

A charging control circuit, wherein the controlled end is connected to the pre-preset-level pixel driving circuit 200 to access the pre-preset-level light emitting control signal Emit N-1 output by the pre-preset-level pixel driving circuit 200, the input end is used to access the preset voltage, and the output end is connected to the second thin film transistor T2;

The charging control circuit is used for outputting a preset voltage to the second thin film transistor T2 when the previous preset stage light emitting control signal Emit N-1 is at a first preset potential, so as to charge the parasitic capacitance formed by the second thin film transistor T2.

In this embodiment, the controlled end of the first thin film transistor T1 can be connected to the gate driving circuit to access the current-stage gate driving signal Scan N output by the gate driving circuit; the current-stage gate driving signal Scan N can have a first preset potential and a second preset potential, one of which can be a high potential and the other can be a low potential; wherein the first preset potential is used to trigger the first thin film transistor T1 to turn on, and the second preset potential is used to trigger the first thin film transistor T1 to turn off. This embodiment is explained by assuming that the first thin film transistor T1 and the second thin film transistor T2 are N-type thin film transistors, the first preset potential is a high potential, and the second preset potential is a low potential.

The cathode of the first self-luminous device OLED1 can be connected to the ground voltage Vss, and a first storage capacitor Cst1 can be connected between the cathode of the first self-luminous device OLED1 and the controlled end of the second thin film transistor T2. The gate driving circuit can determine that when the first self-luminous device OLED1 is driven to work at the level where it is located, it outputs the first preset potential of the current level gate driving signal Scan N to the first thin film transistor T1 to trigger the first thin film transistor T1 to turn on, so that the turned-on first thin film transistor T1 can be connected to the data voltage Data output by the source driving circuit and output to the first storage capacitor Cst1 to pre-charge the first storage capacitor Cst1, and after the pre-charging of the first storage capacitor Cst1 is completed, the terminal voltage of the first storage capacitor Cst1 can be used to raise the potential of the controlled end of the second thin film transistor T2 to the first preset potential, thereby triggering the second thin film transistor T2 to turn on. When the second thin film transistor T2 is turned on, it can output the connected power supply voltage VDD to the anode of the first self-luminous device OLED1, so as to achieve driving the first self-luminous device OLED1 to emit light. However, it is found in the actual setting that the second thin film transistor T2 as a driving thin film transistor has a large parasitic capacitance, so that the potential of the corresponding port of the second thin film transistor T2 will charge the parasitic capacitance during the rising process, resulting in a longer potential rise time of the corresponding port of the second thin film transistor T2, which in turn causes the light emission time of the first self-luminous device OLED1 to be shorter and the light emission effect to be poor, which is not conducive to the high refresh rate design of the self-luminous display.

The present application connects the controlled end of the current-level light-emitting circuit to the previous-preset-level pixel driving circuit 200 to synchronously access the previous-preset-level light-emitting control signal Emit N-1 received when the previous-preset-level pixel driving circuit 200 is working. Since the timing stage of the previous-preset-level light-emitting control signal Emit N-1 is in the first preset potential before the first self-luminous device OLED1 emits light, the preset voltage can be connected before the first self-luminous device OLED1 emits light to raise the potential of the corresponding port of the second thin-film transistor T2, so as to charge the parasitic capacitance at the corresponding port of the second thin-film transistor T2 in advance. Among them, the preset voltage can be obtained by the power management integrated circuit or by the output of a dedicated voltage generating circuit. In this way, the potential rise time at the corresponding port of the second thin-film transistor T2 can be avoided from being affected by the parasitic capacitance, thereby improving the light-emitting time and effect of the first self-luminous device OLED1, thereby solving the problem of parasitic capacitance affecting the light-emitting time and effect of the self-luminous device, which is conducive to the high refresh rate design of the self-luminous display.

5, the display driving circuit further includes:

The current-stage light-emitting control circuit 110, the controlled end is used to access the current-stage light-emitting control signal Emit N, the first input end is used to access the power supply voltage VDD, the second input end is connected to the output end of the second thin-film transistor T2, the first output end is connected to the input end of the second thin-film transistor T2, and the second output end is connected to the anode of the first self-luminous device OLED1;

The current-stage light-emitting control circuit 110 is used to output the power supply voltage VDD to the input end of the second thin-film transistor T2 when the current-stage light-emitting control signal Emit N is at a first preset potential, and to output the power supply voltage VDD outputted from the output end of the second thin-film transistor T2 to the first self-luminous device OLED1, so as to drive the first self-luminous device OLED1 to emit light.

The current-stage light-emitting control circuit 110 may include a third thin-film transistor T3 and a fourth thin-film transistor T4, the controlled ends of the third thin-film transistor T3 and the fourth thin-film transistor T4 may both be connected to the current-stage light-emitting control signal Emit N, the input end of the third thin-film transistor T3 may be connected to the power supply voltage VDD, the output end of the third thin-film transistor T3 may be connected to the input end of the second thin-film transistor T2, the input end of the fourth thin-film transistor T4 may be connected to the output end of the second thin-film transistor T2, and the output end of the fourth thin-film transistor T4 may be connected to the anode of the first self-luminous device OLED1. The current-stage light-emitting control signal Emit N may be generated and output by a timing controller or a dedicated control circuit, and the current-stage light-emitting control signal Emit N may also have a first preset potential and a second preset potential, wherein the first preset potential is used to trigger the third thin-film transistor T3 and the fourth thin-film transistor T4 to turn on, and the second preset potential is used to trigger the third thin-film transistor T3 and the fourth thin-film transistor T4 to turn off. This embodiment is explained by assuming that the third thin-film transistor T3 and the fourth thin-film transistor T4 are both N-type thin-film transistors. When the second thin film transistor T2 is turned on, the current level light emitting control signal Emit N can change from the second preset potential to the first preset potential to trigger the third thin film transistor T3 and the fourth thin film transistor T4 to turn on, so that the turned-on third thin film transistor T3 can output the power supply voltage VDD to the second thin film transistor T2, and the turned-on second thin film transistor T2 and the fourth thin film transistor T4 can output to the anode of the first self-luminous device OLED1, so as to drive the first self-luminous device OLED1 to emit light. It can be understood that the current level light emitting drive signal connected to the current level pixel driving circuit 100 is the previous preset level light emitting control signal Emit N-1 connected to the charging control circuit in the next level pixel driving circuit.

Optionally, the preset voltage includes a first preset voltage, and the charging control circuit includes:

The first charging control circuit 120 has a controlled end for receiving the previous preset level light emitting control signal Emit N-1, an input end for receiving the first preset voltage, and an output end connected to the controlled end of the second thin film transistor T2.

In this embodiment, the first charging control circuit 120 may include a fifth thin film transistor T5, which may be an N-type thin film transistor, and the controlled end, input end and output end of the fifth thin film transistor T5 may be the controlled end, input end and output end of the first charging control circuit 120 respectively. The first charging control circuit 120 may output a first preset voltage to the controlled end of the second thin film transistor T2 when the previous preset level light emitting control signal Emit N-1 is at a first preset potential, so as to charge the parasitic capacitance at the controlled end of the second thin film transistor T2 with the first preset voltage before the first self-luminous device OLED1 emits light. In this way, the potential rise time at the controlled end of the second thin film transistor T2 can be prevented from being affected by the parasitic capacitance, which is conducive to improving the conduction speed of the light emitting device of the second thin film transistor T2, thereby improving the light emitting time of the first self-luminous device OLED1.

Optionally, the preset voltage further includes a second preset voltage, and the charging control circuit includes:

The second charging control circuit 130 has a controlled end for receiving the previous preset level light emitting control signal Emit N-1, an input end for receiving the second preset voltage, and an output end connected to the input end of the second thin film transistor T2.

In this embodiment, the second charging control circuit 130 may include a sixth thin film transistor T6, which may be an N-type thin film transistor, and the controlled end, input end and output end of the sixth thin film transistor T6 may be the controlled end, input end and output end of the second charging control circuit 130 respectively. The second charging control circuit 130 may output a second preset voltage to the input end of the second thin film transistor T2 when the previous preset level light emitting control signal Emit N-1 is at the first preset potential, so as to use the second preset voltage to charge the parasitic capacitance at the input end of the second thin film transistor T2 before the first self-luminous device OLED1 emits light. In this way, the power supply voltage VDD connected to the input end of the second thin film transistor T2 can be prevented from being affected by the parasitic capacitance, which is conducive to ensuring the driving current of the light emitting device of the second thin film transistor T2, thereby improving the light emitting effect of the first self-luminous device OLED1.

Embodiment 3

The present application also proposes a display panel, which includes a first self-luminous device OLED1 and a display driving circuit. The specific structure of the display driving circuit refers to the above embodiment. Since the present display panel adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The display driving circuit is connected to the first self-luminous device OLED1.

The above description is only an optional embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the application concept of the present application, or directly/indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims (10)

1. A display driving circuit, applied to a self-luminous display panel, the self-luminous display panel comprising a first self-luminous device, characterized in that the display driving circuit comprises a current-level pixel driving circuit and a previous-preset-level pixel driving circuit, the current-level pixel driving circuit comprising: A first thin film transistor, a controlled end for receiving a gate drive signal of the current stage, and an input end for receiving a first data voltage; A second thin film transistor, a controlled end connected to the output end of the first thin film transistor, an input end connected to a power supply voltage, and an output end connected to the anode of the first self-luminous device; The light emitting control circuit of this stage, the controlled end is used to access the light emitting control signal of this stage, the first input end is used to access the power supply voltage, the second input end is connected to the output end of the second thin film transistor, the first output end is connected to the input end of the second thin film transistor, and the second output end is connected to the anode of the first self-luminous device; The controlled end of the current-stage light-emitting control circuit is also connected to the previous-preset-stage pixel driving circuit so that before the potential of the current-stage light-emitting control signal changes to the first preset potential, a compensation signal output by the previous-preset-stage pixel driving circuit is connected to charge the parasitic capacitance formed at the controlled end of the current-stage light-emitting control circuit. 2. The display driving circuit according to claim 1, wherein the pre-preset-stage pixel driving circuit comprises: A third thin film transistor, the controlled end of which is used to receive a gate drive signal of a previous preset level, and the input end of which is used to receive a data voltage; a fourth thin film transistor, wherein a controlled end is connected to the output end of the third thin film transistor, an input end is connected to a power supply voltage, and an output end is connected to the anode of the second self-luminous device; A pre-set level light emitting control circuit, wherein the controlled end is used to access the pre-set level light emitting control signal, the first input end is used to access the power supply voltage, the second input end is connected to the output end of the fourth thin film transistor, the first output end is connected to the input end of the fourth thin film transistor, and the second output end is connected to the anode of the second self-luminous device; wherein the first output end and/or the second input end are also connected to the controlled end of the current level light emitting control circuit; The pre-preset level light-emitting control circuit is used to output the power supply voltage to the input end of the fourth thin-film transistor when the pre-preset level light-emitting control signal is at a first preset potential, and to output the power supply voltage output from the output end of the fourth thin-film transistor to the second self-luminous device, so as to drive the second self-luminous device to emit light. 3. The display driving circuit according to claim 2, characterized in that when the first output terminal of the pre-preset stage light emitting control circuit is connected to the controlled terminal of the current stage light emitting control circuit, the pre-preset stage pixel driving circuit further comprises: The first charge control circuit is arranged between the first output terminal of the previous preset level light control circuit and the controlled terminal of the current level light control circuit, the controlled terminal of the first charge control circuit is used to access the control signal, and the first charge control circuit is used to control the on and off of the first output terminal of the previous preset level light control circuit and the controlled terminal of the current level light control circuit according to the potential of the control signal. 4. The display driving circuit according to claim 2, characterized in that when the second input terminal of the pre-preset stage light emitting control circuit is connected to the controlled terminal of the current stage light emitting control circuit, the pre-preset stage pixel driving circuit further comprises: The second charge control circuit is arranged between the second input terminal of the previous preset level light control circuit and the controlled terminal of the current level light control circuit, the controlled terminal of the second charge control circuit is used to access the control signal, and the second charge control circuit is used to control the on and off of the second input terminal of the previous preset level light control circuit and the controlled terminal of the current level light control circuit according to the potential of the control signal. 5. The display driving circuit according to claim 2 or 3, characterized in that the light emitting stage of the second self-luminous device comprises a first stage, a second stage and a third stage which are executed in sequence; In the first stage, the gate driving signal of the previous preset stage is at a first preset potential, the light emitting control signal of the previous preset stage is at a second preset potential, and the control signal is at a second preset potential; In the second stage, the gate driving signal of the previous preset stage is at a second preset potential, the light emitting control signal of the previous preset stage is at a first preset potential, and the control signal is at a second preset potential; In the third stage, the gate driving signal of the previous preset level is at the second preset potential, the light emitting control signal of the previous preset level is at the second preset potential, and the control signal is at the first preset potential. 6. A display driving circuit, applied to a self-luminous display panel, the self-luminous display panel comprising a first self-luminous device, characterized in that the display driving circuit comprises a current-level pixel driving circuit and a previous preset-level pixel driving circuit, the display driving circuit comprising: A first thin film transistor, a controlled end for receiving a gate drive signal of the current stage, and an input end for receiving a first data voltage; A second thin film transistor, a controlled end connected to the output end of the first thin film transistor, an input end connected to a power supply voltage, and an output end connected to the anode of the first self-luminous device; A charging control circuit, wherein a controlled end is connected to the pre-set pixel driving circuit, an input end is used to access a preset voltage, and an output end is connected to the second thin film transistor; The charging control circuit is used to output a preset voltage to the second thin film transistor when the pre-preset level pixel driving circuit receives a pre-preset level light emitting control signal at a first preset potential, so as to charge the parasitic capacitance formed by the second thin film transistor. 7. The display driving circuit according to claim 6, characterized in that the display driving circuit further comprises: a light-emitting control circuit at this stage, wherein the controlled end is used to access the light-emitting control signal at this stage, the first input end is used to access the power supply voltage, the second input end is connected to the output end of the second thin-film transistor, the first output end is connected to the input end of the second thin-film transistor, and the second output end is connected to the anode of the first self-luminous device; The current-stage light-emitting control circuit is used to output the power supply voltage to the input end of the second thin-film transistor when the current-stage light-emitting control signal is at a first preset potential, and to output the power supply voltage output from the output end of the second thin-film transistor to the first self-luminous device, so as to drive the first self-luminous device to emit light. 8. The display driving circuit according to claim 6, wherein the preset voltage comprises a first preset voltage, and the charging control circuit comprises: The first charging control circuit has a controlled end for receiving the light emitting control signal of the previous preset level, an input end for receiving the first preset voltage, and an output end connected to the controlled end of the second thin film transistor. 9. The display driving circuit according to claim 6, wherein the preset voltage further comprises a second preset voltage, and the charging control circuit comprises: The second charging control circuit has a controlled end for receiving the light emitting control signal of the previous preset level, an input end for receiving the second preset voltage, and an output end connected to the input end of the second thin film transistor. 10. A display panel, characterized in that the display panel comprises: a first self-luminous device; and The display driving circuit according to any one of claims 1 to 9, wherein the display driving circuit is connected to the first self-luminous device.