CN117219006A - Display driving circuit, driving method, display panel and display device - Google Patents

Abstract

The embodiment of the application provides a display driving circuit, a driving method, a display panel and a display device, wherein the display driving circuit comprises: a data signal terminal, a light emitting element terminal, a first initialization voltage terminal, a second initialization voltage terminal, and a first circuit; the input end of the first circuit is electrically connected with the data signal end, and the output end of the first circuit is electrically connected with the light-emitting element end; a first initialization voltage terminal configured to be turned on with an output terminal of the first circuit in a case where the data signal terminal transmits the first data signal to the light emitting element terminal; a second initialization voltage terminal configured to be turned on with an output terminal of the first circuit in a case where the data signal terminal transmits a second data signal to the light emitting element terminal; the first gray scale for display of the first data signal is unequal to the second gray scale for display of the second data signal. The embodiment of the application can carry out differential voltage compensation on the display data signals with different gray scales, and reduces the display residual image so as to improve the display effect.

Description

Display driving circuit, driving method, display panel and display device

Technical Field

The embodiment of the application relates to the technical field of display devices, in particular to a display driving circuit, a driving method, a display panel and a display device.

Background

Displaying an afterimage generally means that when the display switches pictures, the previous picture does not disappear immediately, the visual effect appears simultaneously with the next picture or pictures, and the visual effect gradually disappears. In Organic Light-Emitting semiconductor Display devices (OLEDs), such Display afterimages can be further distinguished from long-term afterimages in the Display due to material decay, known as short-term afterimages. The display afterimage influences the normal display work of the display, can influence the display effect of the display, causes the visual perception of a user to be not pure, and reduces the use experience of equipment.

It should be noted that the information for distinguishing the application in the above background art is only for enhancing the understanding of the background of the application and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The embodiment of the application provides a display driving circuit, a driving method, a display panel and a display device, which aim to carry out differentiated voltage compensation on display data signals with different gray scales, reduce or avoid display afterimages caused by TFT hysteresis and improve the display performance and display effect of the display panel.

In one aspect, an embodiment of the present application provides a display driving circuit, including: a data signal terminal, a light emitting element terminal, a first initialization voltage terminal, a second initialization voltage terminal, and a first circuit; the input end of the first circuit is electrically connected with the data signal end, and the output end of the first circuit is electrically connected with the light-emitting element end;

the first initialization voltage terminal is configured to be conducted with the output terminal of the first circuit under the condition that the data signal terminal transmits a first data signal to the light-emitting element terminal;

the second initialization voltage terminal is configured to be conducted with the output terminal of the first circuit in the case that the data signal terminal transmits a second data signal to the light emitting element terminal;

the first gray scale of the first data signal for display is unequal to the second gray scale of the second data signal for display, and the first level of the first initialization voltage terminal is unequal to the second level of the second initialization voltage terminal.

Optionally, the first initialization voltage terminal is further configured to be disconnected from the output terminal of the first circuit in a case where the data signal terminal transmits a second data signal to the light emitting element terminal;

The second initialization voltage terminal is further configured to be disconnected from the output terminal of the first circuit in the case that the data signal terminal transmits the first data signal to the light emitting element terminal;

wherein the first gray level is higher than the second gray level, and the first level is higher than the second level.

Optionally, the second gray level includes: 0 gray scale.

Optionally, the first initialization voltage terminal is further configured to be conducted with the output terminal of the first circuit in a case where the data signal terminal transmits a third data signal to the light emitting element terminal;

wherein the second gray scale is higher than a third gray scale for displaying the third data signal.

Optionally, the method further comprises:

a first transistor electrically connected between the first initialization voltage terminal and an output terminal of the first circuit;

and the second transistor is electrically connected between the second initialization voltage end and the output end of the first circuit.

Optionally, the data signal terminal is further electrically connected to the gate of the first transistor and the gate of the second transistor, respectively;

the first transistor is configured to conduct the first initialization voltage terminal and the output terminal of the first circuit in a case where the data signal terminal transmits the first data signal to the light emitting element terminal;

The second transistor is configured to turn on the second initialization voltage terminal and the output terminal of the first circuit in a case where the data signal terminal transmits the second data signal to the light emitting element terminal.

Optionally, the method further comprises: a third initialization voltage terminal configured to be turned on with an output terminal of the first circuit in a case where the data signal terminal transmits a third data signal to the light emitting element terminal;

the first initialization voltage terminal and the second initialization voltage terminal are further configured to be disconnected from the output terminal of the first circuit in the case where the data signal terminal transmits the third data signal to the light emitting element terminal;

the third gray scale of the third data signal for displaying is not equal to the first gray scale or the second gray scale, and the third level of the third initialization voltage terminal is not equal to the first level or the second level.

Optionally, the first initialization voltage terminal is further configured to be conducted with the output terminal of the first circuit in a case where the data signal terminal transmits a fourth data signal to the light emitting element terminal;

The second initialization voltage terminal is further configured to be conducted with the output terminal of the first circuit in a case where the data signal terminal transmits a fifth data signal to the light emitting element terminal;

wherein a first display frame rate of the fourth data signal is higher than a second display frame rate of the fifth data signal, and the first level is higher than the second level.

Optionally, the first initialization voltage terminal is further configured to be conducted with the output terminal of the first circuit when the data signal terminal transmits a sixth data signal to the light emitting element terminal and the fourth gray level of the sixth data signal for display is lower than a target gray level;

the second initialization voltage terminal is configured to be conducted with the output terminal of the first circuit when the data signal terminal transmits a sixth data signal to the light emitting element terminal and the fourth gray level for displaying of the sixth data signal is higher than the target gray level;

wherein the first level is higher than the second level.

Compared with the prior art, the display driving circuit provided by the embodiment of the application has the following advantages:

The display driving circuit provided by the embodiment of the application can realize differential voltage compensation by utilizing the gating between the first initialization voltage end or the second initialization voltage end and the light-emitting element end aiming at display data signals with different gray scales, is beneficial to carrying out corresponding voltage compensation when the display data signals cannot be in place due to the fact that the TFT hysteresis writing voltage is not in time when the display panel carries out large-amplitude gray scale dynamic change, and reduces or avoids the problem that the afterimage of a display picture appears on the display panel due to the TFT hysteresis, thereby improving the display performance and the display effect of the display panel.

In still another aspect, an embodiment of the present application further provides a driving method, which is applied to the display driving circuit in any one of the foregoing embodiments, including:

turning on a circuit between the first initialization voltage terminal and an output terminal of the first circuit and turning off a circuit between the second initialization voltage terminal and the output terminal of the first circuit in a case that the data signal terminal transmits a first data signal to the light emitting element terminal;

disconnecting a circuit between the first initialization voltage terminal and an output terminal of the first circuit and turning on the circuit between the second initialization voltage terminal and the output terminal of the first circuit in the case that the data signal terminal transmits a second data signal to the light emitting element terminal;

The first gray scale of the first data signal for display is unequal to the second gray scale of the second data signal for display, and the first level of the first initialization voltage terminal is unequal to the second level of the second initialization voltage terminal.

The driving method provided by the embodiment of the application is applied to the display driving circuit in the embodiment, and has all the advantages of the display driving circuit.

In yet another aspect, an embodiment of the present application further provides a display panel, including the display driving circuit in any one of the above embodiments.

The display panel provided by the embodiment of the application comprises the display driving circuit in the embodiment, and also has all the advantages of the display driving circuit.

In still another aspect, an embodiment of the present application further provides a display device, including the display panel in the foregoing embodiment.

The display device provided by the embodiment of the application comprises the display panel in the embodiment, and also has all the advantages of the display panel.

Drawings

The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present application. The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Fig. 1 shows a connection schematic diagram of a display driving circuit in the related art;

FIG. 2 shows a block diagram of a driving circuit in one embodiment provided by the present application;

FIG. 3 is a schematic diagram showing the connection of a display driving circuit according to one embodiment of the present application;

fig. 4 is a block diagram showing a structure of a driving circuit in still another embodiment provided by the present application;

fig. 5 is a flow chart showing the steps of a driving method in one embodiment provided by the present application.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

OLED displays are widely used by terminal devices because of their high luminous efficiency, thin and lightweight device structure, etc. However, display afterimage of an OLED has been one of the important problems the skilled person is addressing. Unlike long-term afterimage caused by decay of OLED luminescent material, the display afterimage referred to in the present application may be short-term afterimage caused by TFT hysteresis. In general, since the response of the thin film field effect transistor (Thin Film Transistor, TFT) to the circuit signal is delayed, the light emitting pixel cannot respond to the gray scale signal in time, and then the state of the pixel voltage written in the display screen of the previous frame cannot be quickly changed to the state of the pixel voltage written in the display screen of the next frame, thereby causing the occurrence of the display afterimage.

The display screen often changes dynamically, and in the display scene where the gray level of the pixel changes rapidly, rapid change of the pixel writing voltage is often required, and TFT hysteresis can make the display afterimage more obvious in the scene where the gray level changes from very low to very high or from very high to very low. For example, fast switching from solid white to solid black, or fast switching from solid black to solid white, is prone to display afterimages. In addition, after the equipment stays for a long time on a display picture with high contrast gray scale dynamic such as a two-dimensional code interface, a startup interface and the like, the display afterimage is easy to appear. The TFT devices in the display driving circuit have a hysteresis in response to the display data signal. The OLED display driving circuit may be regarded as a capacitor, where the capacitor is charged with a voltage boosting process or is depressurized with a discharging process, and in the case where the display data signal exhibits a large-scale rapid dynamic change, the voltage written in the pixel is delayed, so that display afterimages may occur.

Referring to fig. 1, fig. 1 shows a connection schematic diagram of a display driving circuit in the related art. As shown in fig. 1, the inventor has found that the display data signal Vdata is compensated by a single initialization voltage Vinit, and still needs to maintain a high dynamic range to switch pixels formed by the light emitting element EM between different gray scales. Under the condition that the dynamic change range of the display data signals is kept at a high level, the TFTs are difficult to respond in time, so that display afterimages appear in extreme scenes such as 0 gray scale and high gray scale display switching. In one example, in the case that the level of the initialization voltage terminal is unchanged, the voltage of the display data signal of the 0 gray scale of the black screen needs to be far lower than the voltage of the display data signal of the 255 gray scales of the white screen, the display data signal of the high gray scales needs to be compensated by the signal of the high level, the hysteresis effect of the TFT is deteriorated when the node M1 and the node M2 are both at the high level, the writing voltage of the pixel from the 255 gray scales to the 0 gray scales cannot complete the transition within one frame, but complete the transition within a few frames, therefore, after the transmission of the display data signal of the 255 gray scales is changed to the transmission of the display data signal of the 0 gray scales, the pixel is still turned on within one frame or a few frames, and the display residual image can be seen in the image of the one frame or a few frames.

Therefore, the embodiment of the application provides a display driving circuit, a driving method, a display panel and a display device, which aim at display data signals with different gray scales, utilize gating between a first initialization voltage end or a second initialization voltage end and a light-emitting element end to realize differential voltage compensation, and are favorable for carrying out corresponding voltage compensation under the condition that the display data signals cannot be in place in time due to TFT hysteresis writing voltage when the display panel carries out large-scale dynamic change, thereby reducing or avoiding the problem of afterimage of display pictures of the display panel due to TFT hysteresis, and further improving the display performance and the display effect of the display panel.

Embodiments of the present application will be described below with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a block diagram illustrating a driving circuit according to an embodiment of the present application. As shown in fig. 2, an embodiment of the present application provides a display driving circuit 200, which may be applied to a light emitting element in a display panel, where the display panel may be an OLED display panel, and may further be an OLED display panel provided with an LTPO circuit. Thus, the material of the light emitting element may include: an organic light emitting material.

The display driving circuit 200 specifically includes: a data signal terminal Vdata, a light emitting element terminal 220, a first initialization voltage terminal 230, a second initialization voltage terminal 240 and a first circuit 210.

Wherein the data signal terminal Vdata is configured to provide the display data signal to the light emitting element terminal 220 through the first circuit 210, and is used for driving the light emitting elements of different colors to emit the color light with the gray scale brightness corresponding to the display data signal, so as to form the combined light emission of the sub-pixels. The color light may include red, green, and blue light.

Referring to fig. 3, fig. 3 is a schematic diagram illustrating connection of a display driving circuit 200 according to an embodiment of the present application. As shown in fig. 3, the light emitting element terminal 220 may be electrically connected to the light emitting element EM with respect to the remaining one electrically connected to the data signal terminal Vdata. The remaining end of the light emitting element EM may be electrically connected to the VSS voltage terminal. The VSS voltage terminal may be a negative supply voltage terminal.

The input terminal of the first circuit 210 is electrically connected to the data signal terminal Vdata, and the output terminal of the first circuit 210 is electrically connected to the light emitting element terminal 220.

The first circuit 210 may include a plurality of transistors for controlling whether the display data signal is turned on with the light emitting element terminal 220 or processing the display data signal.

In some alternative embodiments, the display data signals may include a first data signal, a second data signal, a third data signal … …, and so on.

In some alternative embodiments, the display driving circuit 200 may further include: the capacitor C1 and the VDD voltage terminal, the first circuit 210 may be electrically connected to the VDD voltage terminal through a transistor, and to the VDD voltage terminal through the capacitor C1, respectively. Wherein the VDD voltage terminal may be a positive supply voltage terminal.

The embodiment of the application considers the signal compensation of differential gating by using an initialization voltage terminal. Wherein, the initializing the voltage terminal may include: a first initialization voltage terminal 230 and a second initialization voltage terminal 240.

The first initialization voltage terminal 230 is configured to be turned on with the output terminal of the first circuit 210 when the data signal terminal Vdata transmits the first data signal to the light emitting element terminal 220.

The first initialization voltage terminal 230 may provide the first initialization voltage signal to the light emitting element terminal 220.

The second initialization voltage terminal 240 is configured to be turned on with the output terminal of the first circuit 210 in a case where the data signal terminal Vdata transmits the second data signal to the light emitting element terminal 220.

The second initialization voltage terminal 240 may provide the second initialization voltage signal to the light emitting element terminal 220.

The first initialization voltage terminal 230 or the second initialization voltage terminal 240 may be a constant voltage terminal, and a constant voltage signal may be provided to the light emitting element through an output terminal of the first circuit 210 for compensating the display data signal.

The first gray level of the first data signal for displaying is not equal to the second gray level of the second data signal for displaying, and the first level of the first initialization voltage terminal 230 is not equal to the second level of the second initialization voltage terminal 240.

In some alternative embodiments, the first and second initialization voltage terminals 230 and 240 may be negative levels for providing negative voltages to the light emitting element terminal 220.

Through the above embodiment, for the display data signals with different gray scales, the gate between the first initialization voltage terminal 230 or the second initialization voltage terminal 240 and the light emitting element terminal 220 is utilized to realize differential voltage compensation, which is favorable for performing corresponding voltage compensation when the display data signals cannot be in place due to TFT hysteresis writing voltage in the case that the display panel is subjected to large-amplitude gray scale dynamic change, so as to reduce or avoid the afterimage problem of the display picture of the display panel caused by TFT hysteresis, thereby improving the display performance and display effect of the display panel.

The gate manner of the first and second initialization voltage terminals 230 and 240 may be determined according to characteristics of the display panel. For simpler compensation scenarios, in an alternative embodiment, the present application provides a single gate compensated display driver circuit 200, wherein,

the first initialization voltage terminal 230 is further configured to be disconnected from the output terminal of the first circuit 210 in the case where the data signal terminal Vdata transmits the second data signal to the light emitting element terminal 220.

The second initialization voltage terminal 240 is further configured to be disconnected from the output terminal of the first circuit 210 in the case that the data signal terminal Vdata transmits the first data signal to the light emitting element terminal 220.

Wherein the first gray level is higher than the second gray level, and the first level is higher than the second level.

In an alternative example, the first gray level may be any one of 1-255 gray levels, the second gray level may be 0 gray level, the level of the first initialization voltage terminal 230 may be-3V, and the level of the second initialization voltage terminal 240 may be-7V.

In an exemplary case where the first data signal transmitted by the data signal terminal Vdata to the light emitting element terminal 220 is higher in the first gray level for display, the first initialization voltage terminal 230 having the relatively higher first level may be used to provide the first initialization voltage signal to the light emitting element terminal 220, so that the sub-pixel driven to emit light by the display driving circuit 200 performs the signal compensation of the higher level on the first data signal when the low gray level display is greatly changed to the high gray level display and the writing voltage of the first data signal cannot reach the high level in time due to the TFT hysteresis effect, thereby avoiding the insufficient gray level brightness of the first frame or several frames written by the first data signal of the sub-pixel driven to emit light by the display driving circuit 200, and reducing or avoiding the problem of low brightness afterimage of the display panel due to the TFT hysteresis effect.

For example, in the case where the second data signal transmitted by the data signal terminal Vdata to the light emitting element terminal 220 is low in the second gray scale for display, the second initialization voltage terminal 240 having the relatively low first level may be used to provide the second initialization voltage signal to the light emitting element terminal 220, so that the sub-pixel driven to emit light by the display driving circuit 200 may perform signal compensation of the low level when the high gray scale luminance display is changed to the low gray scale luminance display greatly and the writing voltage of the second data signal cannot reach the low level in time due to the TFT hysteresis effect, thereby avoiding the high luminance residual image problem of the display panel caused by the TFT hysteresis effect when the sub-pixel driven to emit light is in the first frame or several frames written by the display driving circuit 200.

Through the embodiment, the single gating compensation of the initialization voltage terminal is simply and efficiently performed on the display data signals displaying different gray scales, so that the writing voltage of the pixel can fall back quickly aiming at the initialization voltage signal with lower compensation level of the display scene with greatly reduced gray scales, or the writing voltage of the pixel can jump quickly aiming at the initialization voltage signal with higher compensation level of the display scene with greatly increased gray scales, and the display problem of low-brightness residual image or high-brightness residual image caused by the hysteresis effect of the TFT can be partially or completely solved. Illustratively, when the screen displays 0 gray scale, the first initialization voltage terminal 230 is turned off, the second initialization voltage terminal 240 is turned on, the level of the first initialization voltage terminal 230 may be set to-3V, and the second initialization voltage terminal 240 may be set to-7V, so that the second data signal of 0 gray scale may be compensated and written into the light emitting element with a smaller value to reduce the difference between the second data signal and the second data signal, and when the 0 gray scale is switched to 1-255 gray scale, the effect of TFT hysteresis effect is less, and display afterimage is reduced or eliminated. Moreover, since the output is only for 0 gray scale, and the black picture is displayed for 0 gray scale, the display effect of the circuit or the display panel is hardly negatively affected as long as the 0 gray scale is ensured not to be turned on.

The above embodiments provide signal compensation for single strobe with corresponding initialization voltages for display data signals of different gray scales. Further, the present application contemplates providing a particular initialization voltage for a particular gray level. To this end, in an alternative embodiment, the second gray level comprises: 0 gray scale.

Considering that in the related art, since the 0 gray scale has the property that the black screen does not emit light, in the case that the pixel is lowered from the high gray scale luminance to the 0 gray scale luminance, the voltage difference required to fall back is maximum, and short-time afterimages are also most likely to occur. By setting the second gray level to 0 gray level, the application can effectively solve the problem that the screen is still turned on under the condition that the first data signal with relatively higher gray level brightness is converted into the second data signal with 0 gray level, and compensates the voltage signal provided by the second initialization voltage terminal 240, so that the writing voltage of the pixel can quickly fall back to the voltage level of 0 gray level, and the displayed afterimage is reduced or avoided.

The above embodiments provide signal compensation for single strobe with corresponding initialization voltages for display data signals of different gray scales. Further, the present application contemplates providing signal compensation for combined gating for more complex display requirements. To this end, in an alternative embodiment, the first initialization voltage terminal 230 is further configured to be conducted with the output terminal of the first circuit 210 in the case that the data signal terminal Vdata transmits the third data signal to the light emitting element terminal 220.

The first initialization voltage terminal 230 and the second initialization voltage terminal 240 may provide a negative voltage to the light emitting element terminal 220, and the superposition strobe of the first initialization voltage terminal 230 and the second initialization voltage terminal 240 may provide stronger signal compensation, which is suitable for compensation of display data signals with lower gray scale brightness.

The second gray level is higher than the third gray level of the third data signal for display.

Illustratively, the first gray level may include 125 to 255 gray levels, the second gray level may include 1 to 124 gray levels, and the third gray level may include 0 gray level.

Through the above embodiment, for the display data signals with three different gray scale brightness, the combination gating of the first initialization voltage terminal 230 and the second initialization voltage terminal 240 is utilized to perform targeted signal compensation on different gray scales to be displayed by the light emitting element, so that the display residual image can be eliminated to a greater extent, and the display effect of the display panel is further improved.

Embodiments of the present application may utilize transistors to control the gating between the first and second initialization voltage terminals 230 and 240 and the light emitting element terminal 220. To this end, in an alternative embodiment, the present application further provides a display driving circuit 200, further comprising:

The first transistor T1 is electrically connected between the first initialization voltage terminal 230 and the output terminal of the first circuit 210.

The second transistor T2 is electrically connected between the second initialization voltage terminal 240 and the output terminal of the first circuit 210.

Specifically, the transistor may be a thin film field effect transistor (Thin Film Transistor, TFT). Each transistor may include a source, a drain, and a gate.

In the embodiment of the application, two ends of the transistor may refer to one end of a source and one end of a drain, or collectively referred to as a source and a drain. The on or off state of the transistor may be on or off between the source of the transistor and the source and drain of the transistor.

In the embodiment of the present application, the first initialization voltage terminal 230 and the second initialization voltage terminal 240 can respond to the display data signal transmitted by the data signal terminal Vdata in time, so as to realize connection or disconnection with the output terminal of the first circuit 210. To this end, in an alternative embodiment, the present application also provides a display driving circuit 200, wherein,

the data signal terminal Vdata is also electrically connected to the gate of the first transistor T1 and the gate of the second transistor T2, respectively.

The first transistor T1 is configured to turn on the first initialization voltage terminal and the output terminal of the first circuit when the data signal terminal Vdata transmits the first data signal to the light emitting element terminal 220.

The second transistor T2 is configured to turn on the second initialization voltage terminal and the output terminal of the first circuit when the data signal terminal Vdata transmits the second data signal to the light emitting element terminal 220.

For example, a gate and/or an inverter may be disposed between the data signal terminal Vdata and the gate of the first transistor T1 or the second transistor T2, and the data signal terminal Vdata transmits the display data signal to the gate of the first transistor T1 and the second transistor T2, so that the display data signal may be processed by the gate and/or the inverter, so that the display data signal may be processed to control the on or off of the first transistor T1 and the second transistor T2.

Referring to fig. 4, fig. 4 is a block diagram showing a driving circuit in still another embodiment provided by the present application. As shown in fig. 4, in order to cope with more complex display requirements, the embodiment of the present application further considers that the number of initialization voltage terminals is further increased, and provides more gating modes, so as to adapt to more light-emitting displays with different gray scales in the display panel. To this end, in an alternative embodiment, the present application further provides a display driving circuit 200, further comprising: the third initialization voltage terminal 250 is configured to be turned on with the output terminal of the first circuit 210 in a case where the data signal terminal Vdata transmits the third data signal to the light emitting element terminal 220.

The first and second initialization voltage terminals 230 and 240 are further configured to be disconnected from the output terminal of the first circuit 210 in the case where the data signal terminal Vdata transmits the third data signal to the light emitting element terminal 220.

The third gray level of the third data signal for displaying is not equal to the first gray level or the second gray level, and the third level of the third initialization voltage terminal 250 is not equal to the first level or the second level.

In some alternative embodiments, the first gray level may be higher than the second gray level, and the second gray level may be higher than the third gray level. Accordingly, the first level may be higher than the second level, and the second level may be higher than the third level.

Through the above embodiment, the gray scales can be subdivided into at least three types, and for different gray scales, the gating between the first initialization voltage terminal 230, the second initialization voltage terminal 240, the third initialization voltage terminal 250 and the output terminal of the first circuit 210 is utilized to perform targeted signal compensation on different gray scales to be displayed by the light emitting element, so that the display residual image can be eliminated to a greater extent, and the display effect of the display panel is further improved.

Considering that when the LTPO display panel displays different refresh frame rates, the pixel charging time is different, and the difference of pixel voltages is easy to exist, signal compensation is needed, so that the brightness is kept uniform front and back, and the display effect of the display panel is ensured. The first initialization voltage terminal 230 and the second initialization voltage terminal 240 in the embodiment of the present application may perform differential gating according to the display data signal, and then may be further used to perform targeted signal compensation for different refresh frame rates required to be displayed by the light emitting element. To this end, in an alternative embodiment, the present application also provides a display driving circuit 200, wherein,

The first initialization voltage terminal 230 is further configured to be turned on with the output terminal of the first circuit 210 in the case that the data signal terminal Vdata transmits the fourth data signal to the light emitting element terminal 220.

The second initialization voltage terminal 240 is further configured to be turned on with the output terminal of the first circuit 210 in the case that the data signal terminal Vdata transmits the fifth data signal to the light emitting element terminal 220.

Wherein the first display frame rate of the fourth data signal is higher than the second display frame rate of the fifth data signal, and the first level is higher than the second level.

In combination with the above embodiment, the first initialization voltage terminal 230 or the second initialization voltage terminal 240 may also determine whether to gate with the output terminal of the first circuit 210 according to the display frame rate and the gray scale brightness of the display data signal.

Illustratively, when the display data signal is used to display 0 gray scale and the display frame rate is 1Hz, the first initialization voltage terminal 230 is turned off and the second initialization voltage terminal 240 is turned on.

The OLED display panel can realize combined luminescence by three sub-pixels of RGB, and based on the characteristics of organic luminescent materials, the sub-pixel gray scale brightness is often required to be compensated, so that accurate color display is realized. The embodiment of the application can also utilize the first initialization voltage terminal 230 and the second initialization voltage terminal 240 to perform differential gating according to the display data signal and the target gray scale data, and can realize the correction of the luminous color of the display panel by correcting the gray scale brightness of each of three sub-pixels in one pixel unit. To this end, in an alternative embodiment, the present application also provides a display driving circuit 200, wherein,

The first initialization voltage terminal 230 is further configured to be turned on with the output terminal of the first circuit 210 when the data signal terminal Vdata transmits the sixth data signal to the light emitting element terminal 220 and the fourth gray level of the sixth data signal for displaying is lower than the target gray level.

The second initialization voltage terminal 240 is configured to be turned on with the output terminal of the first circuit 210 when the data signal terminal Vdata transmits the sixth data signal to the light emitting element terminal 220 and the fourth gray level of the sixth data signal for displaying is higher than the target gray level.

Wherein the first level is higher than the second level.

For example, when the sixth data signal is transmitted to the light emitting element terminal 220 after being processed, and then enters the light emitting element of the red subpixel, the light emitting display of 81 gray scales is realized, and the target gray scale is 82 gray scales, a relatively higher voltage needs to be compensated during the signal processing, and the strobe compensation can be performed by the first initialization voltage terminal 230 having the first level.

Embodiments of the present application contemplate compensation based on a 7T1C display driver circuit, and in an alternative implementation, the present application further provides a display driver circuit 200, wherein,

The first circuit 210 includes: a third transistor T3, a fourth transistor T4 and a fifth transistor T5 connected in series with the data signal terminal Vdata in sequence; the display driving circuit 200 further includes: VDD voltage terminal, capacitor C1, sixth transistor T6, seventh transistor T7, and eighth transistor T8.

One end of the capacitor C1 is electrically connected to the VDD voltage terminal, and the other end is electrically connected to the gate of the fourth transistor T4, the seventh transistor T7, and the eighth transistor T8, respectively.

One end of the sixth transistor T6 is electrically connected to the VDD voltage terminal, and the other end is electrically connected to a circuit between the third transistor T3 and the fourth transistor T4.

The seventh transistor T7 is electrically connected to a circuit between the fourth transistor T5 and the fifth transistor T5 with respect to the remaining one of the ends electrically connected to the capacitor C1.

By the above-described embodiments, improvements can be made on the basis of the 7T1C driving circuit employed in the related art, and there are also the following advantages:

(1) The second initialization voltage terminal 240 can be manufactured synchronously without adding additional MASK and Array processes, so that the manufacturing efficiency of the display panel can be ensured.

(2) According to the embodiment of the application, different initialization voltages can be matched according to different gray scales, so that the display ghost of the OLED display panel is reduced, the display effect and the display performance of the display panel are improved, and the product use experience of a user is improved.

(3) According to different display frame rates, corresponding initialization voltages can be provided, and the switching stability between different display frame rates is improved, so that the display effect and the display performance of the display panel are improved.

(4) And corresponding initialization voltage can be provided for compensation according to different color correction requirements, so that the color accuracy of the display panel is improved.

Referring to fig. 5, fig. 5 is a flowchart illustrating steps of a driving method according to an embodiment of the present application. As shown in fig. 5, based on the same inventive concept, the present application also provides a driving method applied to the display driving circuit in any of the above embodiments, including:

in step S601, when the data signal terminal Vdata transmits the first data signal to the light emitting element terminal 220, the circuit between the first initialization voltage terminal 230 and the output terminal of the first circuit 210 is turned on, and the circuit between the second initialization voltage terminal 240 and the output terminal of the first circuit 210 is turned off.

In step S602, in the case that the data signal terminal Vdata transmits the second data signal to the light emitting element terminal 220, the circuit between the first initialization voltage terminal 230 and the output terminal of the first circuit 210 is disconnected, and the circuit between the second initialization voltage terminal 240 and the output terminal of the first circuit 210 is turned on.

The first gray level of the first data signal for displaying is not equal to the second gray level of the second data signal for displaying, and the first level of the first initialization voltage terminal 230 is not equal to the second level of the second initialization voltage terminal 240.

Based on the same inventive concept, in yet another aspect, an embodiment of the present application further provides a display panel including the display driving circuit 200 in any of the above embodiments.

Based on the same inventive concept, the embodiment of the application also provides a display device, which comprises the display panel in the embodiment.

In some alternative embodiments, the display device may include: display apparatus based on OLED devices.

Specifically, the display device may include a display module, a smart watch, a mobile phone, a tablet computer, a display screen of VR device, or a computer display.

Based on the same inventive concept, the embodiment of the application also provides electronic equipment, which comprises the display device.

In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device comprising the element.

Finally, it should be further noted that the principles and embodiments of the present application are described herein with specific examples, and the above examples are only for aiding in understanding the technical solution of the present application and its core ideas. While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the application.

Claims (12)

1. A display driving circuit, comprising: a data signal terminal, a light emitting element terminal, a first initialization voltage terminal, a second initialization voltage terminal, and a first circuit; the input end of the first circuit is electrically connected with the data signal end, and the output end of the first circuit is electrically connected with the light-emitting element end;

the first initialization voltage terminal is configured to be conducted with the output terminal of the first circuit under the condition that the data signal terminal transmits a first data signal to the light-emitting element terminal;

the second initialization voltage terminal is configured to be conducted with the output terminal of the first circuit in the case that the data signal terminal transmits a second data signal to the light emitting element terminal;

The first gray scale of the first data signal for display is unequal to the second gray scale of the second data signal for display, and the first level of the first initialization voltage terminal is unequal to the second level of the second initialization voltage terminal.

2. The display driver circuit according to claim 1, wherein,

the first initialization voltage terminal is further configured to be disconnected from the output terminal of the first circuit in the case that the data signal terminal transmits a second data signal to the light emitting element terminal;

the second initialization voltage terminal is further configured to be disconnected from the output terminal of the first circuit in the case that the data signal terminal transmits the first data signal to the light emitting element terminal;

wherein the first gray level is higher than the second gray level, and the first level is higher than the second level.

3. The display driver circuit according to claim 2, wherein the second gray scale includes: 0 gray scale.

4. The display driver circuit according to claim 2, wherein,

the first initialization voltage terminal is further configured to be conducted with the output terminal of the first circuit when the data signal terminal transmits a third data signal to the light emitting element terminal;

Wherein the second gray scale is higher than a third gray scale for displaying the third data signal.

5. The display driver circuit according to claim 1, further comprising:

a first transistor electrically connected between the first initialization voltage terminal and an output terminal of the first circuit;

and the second transistor is electrically connected between the second initialization voltage end and the output end of the first circuit.

6. The display driver circuit according to claim 5, wherein the data signal terminal is further electrically connected to the gate of the first transistor and the gate of the second transistor, respectively;

the first transistor is configured to conduct the first initialization voltage terminal and the output terminal of the first circuit in a case where the data signal terminal transmits the first data signal to the light emitting element terminal;

the second transistor is configured to turn on the second initialization voltage terminal and the output terminal of the first circuit in a case where the data signal terminal transmits the second data signal to the light emitting element terminal.

7. The display driver circuit according to claim 1, further comprising: a third initialization voltage terminal configured to be turned on with an output terminal of the first circuit in a case where the data signal terminal transmits a third data signal to the light emitting element terminal;

The first initialization voltage terminal and the second initialization voltage terminal are further configured to be disconnected from the output terminal of the first circuit in the case where the data signal terminal transmits the third data signal to the light emitting element terminal;

the third gray scale of the third data signal for displaying is not equal to the first gray scale or the second gray scale, and the third level of the third initialization voltage terminal is not equal to the first level or the second level.

8. The display driver circuit according to claim 1, wherein,

the first initialization voltage terminal is further configured to be conducted with the output terminal of the first circuit when the data signal terminal transmits a fourth data signal to the light emitting element terminal;

the second initialization voltage terminal is further configured to be conducted with the output terminal of the first circuit in a case where the data signal terminal transmits a fifth data signal to the light emitting element terminal;

wherein a first display frame rate of the fourth data signal is higher than a second display frame rate of the fifth data signal, and the first level is higher than the second level.

9. The display driver circuit according to claim 1, wherein,

the first initialization voltage terminal is further configured to be conducted with the output terminal of the first circuit when the data signal terminal transmits a sixth data signal to the light emitting element terminal and the fourth gray level for displaying of the sixth data signal is lower than the target gray level;

the second initialization voltage terminal is configured to be conducted with the output terminal of the first circuit when the data signal terminal transmits a sixth data signal to the light emitting element terminal and the fourth gray level for displaying of the sixth data signal is higher than the target gray level;

wherein the first level is higher than the second level.

10. A driving method, characterized by being applied to the display driving circuit according to any one of claims 1 to 9, comprising:

turning on a circuit between the first initialization voltage terminal and an output terminal of the first circuit and turning off a circuit between the second initialization voltage terminal and the output terminal of the first circuit in a case that the data signal terminal transmits a first data signal to the light emitting element terminal;

Disconnecting a circuit between the first initialization voltage terminal and an output terminal of the first circuit and turning on the circuit between the second initialization voltage terminal and the output terminal of the first circuit in the case that the data signal terminal transmits a second data signal to the light emitting element terminal;

the first gray scale of the first data signal for display is unequal to the second gray scale of the second data signal for display, and the first level of the first initialization voltage terminal is unequal to the second level of the second initialization voltage terminal.

11. A display panel comprising the display driving circuit according to any one of claims 1 to 9.

12. A display device, comprising: the display panel of claim 11.