CN112927646B - Display panel, pixel driving method and electronic equipment - Google Patents

Display panel, pixel driving method and electronic equipment Download PDF

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CN112927646B
CN112927646B CN202110123989.5A CN202110123989A CN112927646B CN 112927646 B CN112927646 B CN 112927646B CN 202110123989 A CN202110123989 A CN 202110123989A CN 112927646 B CN112927646 B CN 112927646B
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transistor
voltage
unit
pixel
electrode
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CN112927646A (en
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赵强
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Yungu Guan Technology Co Ltd
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Yungu Guan Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

The embodiment of the application provides a display panel, a pixel driving method and electronic equipment, and relates to the technical field of display. The charging voltage can be determined by the display driving chip based on the variation between the gray value of the pixel light-emitting unit in the previous frame and the gray value of the frame to be displayed currently, and the voltage storage unit is precharged in the precharge stage based on the determined charging voltage, so that the voltage storage unit can be rapidly charged to the compensated data voltage in a short time in the data writing stage, and the pixel driving unit can be ensured to drive the pixel light-emitting unit to emit light by adopting sufficient driving current in the light-emitting stage. Therefore, the technical problem that the voltage storage unit is insufficiently charged in the data writing stage can be solved, and the display uniformity effect of the display panel is ensured when the resolution and/or the refreshing frequency are/is improved.

Description

Display panel, pixel driving method and electronic equipment
Technical Field
The application relates to the technical field of display, in particular to a display panel, a pixel driving method and electronic equipment.
Background
The refresh frequency and the resolution of the display panel are key indexes for measuring the quality of the display panel, and as the demand of a user is continuously increased, the high refresh frequency and the high resolution have become the trend of the industry, and as the refresh frequency and the resolution are increased, the line scanning time of the display panel is shortened. Taking 2160 rows of pixels and frame picture a with a refresh rate of 120HZ and 1080 rows of pixels and frame picture B with a refresh rate of 60HZ as examples, each line scanning time in frame picture a is one fourth of each line scanning time in frame picture B. This may result in insufficient charging time of the pixel driving circuit, causing insufficient driving current of the light emitting device, thereby affecting the display effect of the display apparatus, for example, display uniformity is deteriorated.
It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
Disclosure of Invention
In order to overcome the technical problems mentioned in the background, embodiments of the present application provide a display panel, a pixel driving method and an electronic device.
In a first aspect of the present application, a display panel is provided, where the display panel includes a display driving chip and a plurality of pixel rows, each pixel row includes a plurality of sub-pixels, each sub-pixel includes a pixel driving circuit, and the pixel driving circuit includes a pre-charging unit, a data writing unit, a pixel driving unit, a voltage storage unit, and a pixel light emitting unit;
the data writing unit is respectively connected with the pixel driving unit and the voltage storage unit and is used for writing data voltage into the pixel driving unit and the voltage storage unit in a data writing stage;
the voltage storage unit is used for storing the data voltage;
the pixel driving unit is connected with the pixel light-emitting unit and used for driving the pixel light-emitting unit to emit light according to the data voltage stored in the voltage storage unit in a light-emitting stage;
the display driving chip is used for determining a charging voltage based on the variation between the gray value of the pixel light-emitting unit in the previous frame picture and the gray value of the current frame picture to be displayed;
the pre-charging unit is connected with the voltage storage unit and the display driving chip and is used for pre-charging the voltage storage unit according to the charging voltage determined by the display driving chip in a pre-charging stage.
According to the display panel, the charging voltage can be determined by the display driving chip based on the variation between the gray value of the pixel light-emitting unit in the previous frame and the gray value of the current frame to be displayed, and the voltage storage unit can be precharged in the precharging stage based on the determined charging voltage, so that the voltage storage unit can be rapidly charged to the compensated data voltage in a short time in the data writing stage, and the pixel driving unit can be ensured to drive the pixel light-emitting unit to emit light by adopting sufficient driving current in the light-emitting stage. Therefore, the technical problem that the voltage storage unit is insufficiently charged in the data writing stage can be solved, and the display effect of the display panel is ensured when the resolution and/or the refreshing frequency are/is improved.
In one possible embodiment of the present application, the pixel driving circuit further includes an initialization unit;
the initialization unit is connected with the pixel light-emitting unit and used for initializing the voltage of the pixel light-emitting unit in the pre-charging stage.
In one possible embodiment of the present application, the voltage storage unit stores a voltage not greater than a difference between the data voltage and an absolute value of a turn-on voltage of the pixel driving unit in the precharge phase.
In a possible embodiment of the present application, if a variation between a gray value of the pixel light emitting unit in a previous frame and a gray value of a frame to be displayed currently is within a predetermined gray value variation interval, the charging voltage determined by the display driver chip is a fixed charging voltage, and the pre-charging unit pre-charges the voltage storage unit with the fixed charging voltage.
In one possible embodiment of the present application, the data writing unit includes a first transistor, a sixth transistor, and a seventh transistor, the pixel driving unit includes a second transistor, the pre-charging unit includes a third transistor and a fourth transistor, the pixel light emitting unit includes an OLED light emitting device, a fifth transistor, and an eighth transistor, the voltage storage unit includes a storage capacitor, and the pixel driving circuit further includes a fifth transistor;
an input electrode of the first transistor is connected with a data line, an output electrode of the first transistor is connected with an input electrode of the second transistor, and a control electrode of the first transistor is connected with a second scanning line;
an input electrode of the seventh transistor is connected to an output electrode of the second transistor, an output electrode of the seventh transistor is connected to an input electrode of the sixth transistor, an output electrode of the sixth transistor is connected to the first end of the storage capacitor, and a control electrode of the sixth transistor and a control electrode of the seventh transistor are connected to the second scan line;
the input electrode of the second transistor is further connected with a power line through the fifth transistor, the output electrode of the second transistor is connected with the first electrode of the OLED light-emitting device, the control electrode of the second transistor is connected with the first end of the storage capacitor, the second end of the storage capacitor is connected with the power line, the second electrode of the OLED light-emitting device is grounded, and the control electrode of the fifth transistor is connected with an enabling signal line;
an input electrode of the third transistor is connected to a precharge line, an output electrode of the third transistor is connected to an input electrode of the fourth transistor, an output electrode of the fourth transistor is connected to a first end of the storage capacitor, and a control electrode of the third transistor and a control electrode of the fourth transistor are connected to a first scan line;
an input electrode of the eighth transistor is connected with an output electrode of the second transistor, an output electrode of the eighth transistor is connected with the first electrode of the OLED light-emitting device, and a control electrode of the eighth transistor is connected with an enable signal line.
In one possible embodiment of the present application, the initialization unit further includes a ninth transistor;
an input electrode of the ninth transistor is connected with a reset voltage line, an output electrode of the ninth transistor is connected with a first electrode of the OLED light-emitting device, and a control electrode of the ninth transistor is connected with the first scan line.
In a second aspect of the present application, there is also provided a pixel driving method, which is applied to the display panel of the first aspect, and includes:
in the pre-charging stage, the display driving chip determines a charging voltage based on the variation between the gray value displayed by the pixel light-emitting unit in the previous frame and the gray value in the current frame to be displayed, and controls the pre-charging unit to pre-charge the voltage storage unit by adopting the determined charging voltage;
in a data writing phase, controlling the data writing unit to write a data voltage into the pixel driving unit and the voltage storage unit, wherein the voltage storage unit is used for storing the data voltage;
and in the light-emitting stage, controlling the pixel driving unit to drive the pixel light-emitting unit to emit light according to the data voltage stored in the voltage storage unit.
In one possible embodiment of the present application, the display panel further includes an initialization unit, and the method further includes:
and in the pre-charging stage, controlling the initialization unit to initialize the voltage of the pixel light-emitting unit.
In one possible embodiment of the present application, during the precharge phase,
if the variation between the gray value displayed by the pixel light-emitting unit in the previous frame and the gray value in the current frame to be displayed is in a set gray value variation interval, controlling the pre-charging unit to pre-charge the voltage storage unit by using a fixed charging voltage.
In a second aspect of the present application, an electronic device is further provided, where the electronic device includes the display panel of the first aspect.
Compared with the prior art, the display panel, the pixel driving method and the electronic device are provided by the embodiment of the application. Because the gray value of the pixel light-emitting unit in a frame picture is related to the data voltage for driving the pixel light-emitting unit to emit light, the display driving chip can determine the charging voltage based on the variation between the gray value of the pixel light-emitting unit in the previous frame picture and the gray value of the frame picture to be displayed at present, and pre-charge the voltage storage unit in the pre-charging stage based on the determined charging voltage, so that the voltage storage unit can be rapidly charged to the compensated data voltage in a short time in the data writing stage, and the pixel driving unit can be ensured to drive the pixel light-emitting unit to emit light by adopting sufficient driving current in the light-emitting stage. Therefore, the technical problem that the voltage storage unit is insufficiently charged in the data writing stage can be avoided, and the display uniformity effect of the display panel is ensured when the resolution and/or the refreshing frequency are/is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 3 is another schematic diagram of a pixel driving circuit according to an embodiment of the disclosure;
fig. 4 is a circuit diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 5 is another circuit diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 6 is a timing diagram illustrating an operation of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram illustrating a comparison between a storage capacitor charging curve provided in the present embodiment and a storage capacitor charging curve in the prior art;
fig. 8 is a flowchart illustrating a pixel driving method applied to the display panel of fig. 1 according to an embodiment of the disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, are only used for convenience of description and simplification of description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," "fourth," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
It should be noted that, in case of conflict, different features in the embodiments of the present application may be combined with each other.
In order to solve the technical problems mentioned in the background art, there may be several solutions as follows.
In the first solution, the voltage storage unit is implemented by using a capacitor with a smaller capacitance value, so that the charging time can be shortened, and the charging speed is increased to ensure that the data voltage can be quickly written into the voltage storage unit in the data writing stage.
In the second solution, a reset voltage line for precharging the voltage storage unit is added, and dual reset voltage lines are adopted, wherein one reset voltage line is used for initializing the voltage of the pixel light-emitting unit, and the other reset voltage line is used for precharging the voltage storage unit, so that the writing pressure of the data voltage in the data writing stage is relieved.
With respect to the first solution, the inventors have found through research that the technical problems mentioned in the background art can be solved at a high refresh frequency. However, at a low refresh rate, the leakage current of the voltage storage unit is larger due to a smaller capacitance value, so that the voltage of the control electrode of the pixel driving unit in the light-emitting stage cannot be maintained at the compensated data voltagePressure V DATA -|V th L, wherein V DATA Is the data voltage, V th Is the turn-on voltage of the pixel driving unit, which eventually causes display abnormality. Therefore, the voltage storage unit is not suitable for low refresh frequency by using a capacitor with a smaller capacitance value, which conflicts with the current dynamic refresh requirement that the display panel has both high and low refresh frequencies.
In view of the second solution, the inventors have found through research that there is still a problem that the voltage storage unit is insufficiently charged at high resolution and/or high refresh frequency, for example, the reset voltage of the initializing pixel light emitting unit is-3V, the reset voltage of the precharging pixel is 0V, the data voltage is 6V, and the voltage difference in the data writing stage is reduced from 9V to 6V, but the voltage difference to be written is still large, and there is still a problem that the voltage storage unit is insufficiently charged in the data writing stage.
In order to solve the problem of insufficient charging of the voltage storage unit in the data writing phase, the inventor innovatively designs the following technical scheme. Specific implementations of the present application will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a display panel provided in an embodiment of the present application, where the display panel 10 includes a plurality of pixel rows, each pixel row includes a plurality of sub-pixels, and each sub-pixel includes a pixel driving circuit 100 for driving the sub-pixel to emit light. Referring to fig. 2, fig. 2 shows a schematic diagram of a pixel driving circuit 100 according to an embodiment of the disclosure.
The pixel driving circuit 100 may include a pre-charging unit 110, a data writing unit 120, a pixel driving unit 130, a voltage storing unit 140, and a pixel light emitting unit 150.
The data writing unit 120 is respectively connected to the pixel driving unit 130 and the voltage storage unit 140, and is configured to write a data voltage to the pixel driving unit 130 and the voltage storage unit 140 during a data writing phase. The voltage storage unit 140 is used to store the data voltage. The pixel driving unit 130 is connected to the pixel light emitting unit 150, and is configured to drive the pixel light emitting unit 150 to emit light according to the data voltage stored in the voltage storage unit 140 during the light emitting period. The precharge unit 110 is connected to the voltage storage unit 140 for precharging the voltage storage unit 140 in a precharge phase.
Referring to fig. 1 again, the display panel 10 further includes a display driving chip 200, and the display driving chip 200 is configured to determine the charging voltage Vn based on a variation between a gray-level value of the pixel light-emitting unit 150 in a previous frame and a gray-level value of a frame to be displayed currently.
In the above technical solution, because the gray level of the pixel light emitting unit in a frame is related to the data voltage for driving the pixel light emitting unit to emit light, the display driving chip 200 may determine the charging voltage based on the variation between the gray level of the pixel light emitting unit 150 in a previous frame and the gray level of the current frame to be displayed, and transmit the determined charging voltage to the pre-charging unit 110 of the pixel driving circuit 100, so as to pre-charge the voltage storage unit 140 in the pre-charging stage, so that the voltage storage unit 140 can be quickly charged to the compensated data voltage in a short time in the data writing stage, and it is ensured that the pixel driving unit 130 can drive the pixel light emitting unit 150 to emit light with sufficient driving current in the light emitting stage. Therefore, the technical problem of insufficient charging of the voltage storage unit 140 during the data writing stage can be avoided, so as to ensure the display effect of the display panel 10 when the resolution and/or the refresh frequency are/is increased, and simultaneously, the dynamic refresh requirement of the display panel 10 with high and low refresh frequencies can be satisfied.
Referring to fig. 1 again, in the present embodiment, the display panel 10 may further include an input electrode driver 300, a control electrode driver 400 and a power chip 500. The input electrode driver 300 can provide the pixel driving circuit 100 with the precharge voltage Vn through the precharge line Vi (1 ≦ i ≦ N, N is the number of sub-pixels per pixel row), and the input electrode driver 300 can also provide the precharge voltage Vn through the data line V DATA(i) (i is 1. Ltoreq. N) provides the pixel driving circuit 100 with a data voltage.
In this embodiment, the display driving chip 200 may be connected to the input electrode driver 300, and after the display driving chip 200 determines the charging voltage Vn according to the variation between the gray-level value of the pixel light-emitting unit 150 in the previous frame and the gray-level value of the current frame to be displayed, the input electrode driver 300 provides the pre-charging voltage for the pixel driving circuit 100. Specifically, the input electrode of the transistor of the precharge unit in the pixel drive circuit 100 is supplied with the charge voltage Vn through the precharge line Vi.
The control electrode driver 400 provides scanning signals for the pixel rows through scanning lines Scan (j) (j is greater than or equal to 1 and less than or equal to M, M is the number of rows of the pixel rows), and the control electrode driver 400 may be implemented by using a plurality of cascaded shift registers, so as to Scan the pixel rows on the display panel 10 line by line through a plurality of line scanning lines. Specifically, the display driving chip 200 may be connected to the control electrode driver 400, and the control of the control electrode driver 400 may implement the progressive scanning of the pixel rows on the display panel 10.
The power chip 500 may provide a power signal to the pixel driving circuit 100 through the power line VDD, and the power chip 500 may further provide a ground signal to the pixel driving circuit 100 through the ground line GND, and specifically, the display driving chip 200 may be connected to the power chip 500 to provide the power signal and the ground signal to the pixel driving circuit 100 through the control of the power chip 500.
For the specific connection manner of each wire and the pixel driving circuit 100, after the description of the specific structure of the pixel driving circuit 100, the description is made in conjunction with the specific structure of the pixel driving circuit 100, which is convenient for understanding.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating another functional block of the pixel driving circuit 100 according to an embodiment of the disclosure. The pixel driving circuit 100 may further include an initializing unit 160, wherein the initializing unit 160 is connected to the pixel light emitting unit 150 for initializing a voltage of the pixel light emitting unit 150 in a precharge phase. Initializing the voltage of the pixel light emitting unit 150 can remove the voltage remained by the pixel light emitting unit 150 during the last display, thereby avoiding the formation of the ghost on the display panel at the high refresh rate and improving the display effect of the display panel.
In order to write the data voltage V into the pixel driving unit 130 in the data writing stage DATA Voltage on demand memory cell 140The voltage Vc stored after the pre-charging stage is not more than the compensated data voltage, wherein the compensated data voltage is the data voltage V DATA And the turn-on voltage V of the pixel driving unit 130 th Is the difference between the absolute values of (c), i.e. Vc<V DATA -|V th To ensure that the pixel driving unit 130 is in an on state when the data voltage is written, so as to write the data voltage V in the data writing phase DATA To the pixel driving unit 130 and the voltage storage unit 140. In the embodiment of the present application, vc may be V DATA -|V th 0.7-0.9 times of |.
The inventor further finds that, when the variation between the gray-level value of the pixel light-emitting unit 150 in the previous frame and the gray-level value of the current frame to be displayed is large, the problem of insufficient charging of the voltage storage unit in the data writing stage can be solved well by using the technical solution provided by the embodiment of the present application. However, when the variation between the gray-level value of the pixel light-emitting unit 150 in the previous frame and the gray-level value of the current frame to be displayed is small, the technical solution provided by the embodiment of the present application may increase the waste of computing resources and power consumption of the display driving chip. Therefore, when the variation between the gray-level value of the pixel light-emitting unit 150 in the previous frame and the gray-level value of the current frame to be displayed is within a predetermined gray-level value variation interval, the charging voltage determined by the display driver chip 200 may be a fixed charging voltage. For example, when the maximum grayscale value is 255 and the minimum grayscale value is 0, the set grayscale value variation interval may be 0 to 128, and when the variation between the grayscale value in the previous frame and the grayscale value in the current frame to be displayed by the pixel light-emitting unit 150 is within the grayscale value variation interval, the fixed charging voltage may be an average voltage of the data voltage corresponding to the maximum grayscale value and the data voltage corresponding to the minimum grayscale value, in which case, the pre-charging unit 110 may pre-charge the voltage storage unit 140 with the fixed charging voltage. Under the condition that the gray scale of the picture is not changed greatly, the data voltage is not changed greatly, the problem of insufficient charging time in the data writing stage can be solved by pre-charging the voltage storage unit 140 by adopting the fixed charging voltage, and when the gray scale of the picture is detected to be not changed greatly, the fixed charging voltage is directly adopted for pre-charging, so that the calculation resource and the power consumption occupied by the display driving chip due to the fact that the charging voltage is determined can be reduced.
Referring to fig. 4, fig. 4 illustrates a schematic diagram of a possible structure of the pixel driving circuit 100. The data writing unit 120 may include a first transistor M1, a sixth transistor M6, and a seventh transistor M7, the pixel driving unit 130 may include a second transistor M2, the pre-charging unit 110 may include a third transistor M3 and a fourth transistor M4, the pixel light emitting unit 150 may include an OLED light emitting device, a fifth transistor M5, and an eighth transistor M8, and the voltage storage unit 140 may include a storage capacitor C1.
Referring to FIGS. 1 and 4, the input electrode of the first transistor M1 is connected to V DATA(i) An output electrode of the first transistor M1 is connected to an input electrode of the second transistor M2, and a control electrode of the first transistor M1 is connected to the second Scan line Scan (j).
An input electrode of the seventh transistor M7 is connected to the output electrode of the second transistor M2, an output electrode of the seventh transistor M7 is connected to an input electrode of the sixth transistor M6, an output electrode of the sixth transistor M6 is connected to the first end of the storage capacitor C1, and a control electrode of the sixth transistor M6 and a control electrode of the seventh transistor M7 are connected to the second Scan line Scan (j).
The input electrode of the second transistor M2 is also connected to a power supply line VDD via a fifth transistor M5, specifically, the power supply line is connected to the input electrode of the fifth transistor M5, the input electrode of the second transistor M2 is connected to the output electrode of the fifth transistor M5, and the control electrode of the fifth transistor M5 is connected to the enable signal line EM. An output electrode of the second transistor M2 is connected to a first electrode of the OLED light emitting device, a control electrode of the second transistor M2 is connected to a first end of the storage capacitor C1, a second end of the storage capacitor C2 is connected to a power line VDD, and a second electrode of the OLED light emitting device is grounded.
An input electrode of the third transistor M3 is connected to a precharge line for supplying a charging voltage, an output electrode of the third transistor M3 is connected to an input electrode of the fourth transistor M4, an output electrode of the fourth transistor M4 is connected to the first end of the storage capacitor C1, and a control electrode of the third transistor M3 and a control electrode of the fourth transistor M4 are connected to the first Scan line Scan (j-1).
An input electrode of the eighth transistor M8 is connected to the output electrode of the second transistor M2, an output electrode of the eighth transistor M8 is connected to the first electrode of the OLED light emitting device, and a control electrode of the eighth transistor M8 is connected to the enable signal line EM.
In the embodiment of the present application, the first end of the storage capacitor C1 is connected to the sixth transistor M6 and the seventh transistor M7 which are commonly connected to the gate, and the third transistor M3 and the fourth transistor M4 which are commonly connected to the gate. The influence of the leakage current on the storage voltage on the storage capacitor C1 when the transistor is turned off can be reduced, so that the storage voltage on the storage capacitor C1 can be better maintained.
Referring to fig. 5, fig. 5 is a schematic structural diagram of another pixel driving circuit. The initialization unit 160 may further include a ninth transistor M9, an input electrode of the ninth transistor M9 and a reset voltage line V ref An output electrode of the ninth transistor M9 is connected to the first electrode of the OLED light emitting device, and a control electrode of the ninth transistor M9 is connected to the first Scan line Scan (j-1).
In this embodiment, the transistor may be a P-type transistor, an input electrode of the transistor corresponds to a source of the transistor, an output electrode of the transistor corresponds to a drain of the transistor, a control electrode of the transistor corresponds to a gate of the transistor, a first electrode of the OLED light emitting device is an anode of the OLED light emitting device, and a second electrode of the OLED light emitting device is a cathode of the OLED light emitting device.
Referring to fig. 6, fig. 6 shows an operation timing diagram of the pixel driving circuit 100, the operation timing includes a pre-charge phase T11, a data write phase T12, and an emission phase T13. The operation principle of the pixel driving circuit 100 will be described with reference to fig. 5 and 6.
In the precharge period T11, the first Scan line Scan (j-1) inputs a low level signal, and the third transistor M3, the third transistor M4, and the ninth transistor M9 are turned on; a high-level signal is input into the second scanning line Scan (j), and the first transistor M1, the sixth transistor M6 and the seventh transistor M7 are turned off; the enable signal line EM inputs a high level signal, and the fifth transistor M5 and the eighth transistor M8 are turned off. The precharge line Vi inputs a precharge voltage Vn signal, the precharge voltage Vn is written into the storage capacitor C1 through the third transistor M3 and the fourth transistor M4 to precharge the storage capacitor C1, so that the voltage at the Q point at one end of the storage capacitor C1 is Vc, where the precharge voltage Vn may be equal to Vc or not.
For example, the gray value in the previous frame is 0 (corresponding to V) DATA(i-1) 6V) and the gray level in the current frame is 255 (corresponding to V) DATA(i) 0V), the precharge voltage Vn needs to be as large as possible, and Vn = V may be set, for example DATA(i-1)- |V th L, wherein V th For the turn-on voltage of the second transistor M2, assume V th about-2V, vn can reach 4V, at V th Vn can even be set to higher voltages when there is a change in stability and characteristics. In this case, the precharge time of the storage capacitor C1 may be insufficient, vn may not be equal to Vc, i.e., vc may be less than Vn.
As another example, the gray-level value in the previous frame is 255 (corresponding to V) DATA(i-1) 0V) and the gray level in the current frame is 0 (corresponding to V) DATA(i) 6V), the precharge voltage Vn needs to be as small as possible, and the voltage Vn can be set to-3V or lower so that the voltage at the Q point at the end of the storage capacitor C1 is quickly charged to Vc. In this case, the precharge time for the storage capacitor C1 may be insufficient, vn may not be equal to Vc, i.e., vc may be greater than Vn.
As another example, the gray-level value in the previous frame is 128 (corresponding to V) DATA(i-1) 4V) and the gray level in the current frame is 160 (corresponding to V) DATA(i) 3.5V), a precharge voltage Vn = V may be set DATA(j) -|Vth|-V buffer In which V is buffer For a reserve voltage, V is generally set buffe r is the voltage which can be written completely in the data writing stage ， Since the gray-level values in the preceding and succeeding frames do not vary much, the storage capacitor C1 can be completely written in the precharge phase VnNamely Vn = Vc, the voltage V is written in the data writing phase buffer And (4) finishing. It is also possible to set the precharge voltage Vn to a fixed voltage, for example, vn can be held at V DATA(i-1) Or Vn may set the average of the maximum data voltage and the minimum data voltage. In this case, the precharge time for the storage capacitor C1 may be sufficient, i.e., vn = Vc.
In the precharge period T11, the reset voltage V inputted from the reset voltage line ref And resetting the anode voltage of the OLED light-emitting device to remove the residual voltage of the anode of the OLED light-emitting device and avoid forming residual shadows on the display panel under the high refreshing frequency.
In the data writing stage T12, the first Scan line Scan (j-1) inputs a high level signal, and the third transistor M3, the third transistor M4, and the ninth transistor M9 are turned off; a low-level signal is input into the second Scan line Scan (j), and the first transistor M1, the sixth transistor M6, and the seventh transistor M7 are turned on; the enable signal line EM inputs a high level signal, and the fifth transistor M5 and the eighth transistor M8 are turned off. Since the gate voltage Vg = Vc of the second transistor M2 after the precharge phase<V DATA(i) -|V th | ， At the source voltage Vs = V of the second transistor M2 DATA(i)， The second transistor M2 is turned on. Data voltage V DATA(i) Writing the data voltage V to the gate of the second transistor M2 and the storage capacitor through the first transistor M1, the second transistor M2, the seventh transistor M7, and the sixth transistor M6 DATA(i) Since the first transistor M1, the seventh transistor M7, and the sixth transistor M6 are operated in a linear state and the second transistor M2 is operated in a saturation state, the gate voltage of the second transistor M2 and the voltage of the storage capacitor reach V DATA(i) -|V th When l, the data write is complete.
Referring to fig. 7, fig. 7 is a schematic diagram illustrating a comparison between a storage capacitor charging curve of the present embodiment and a storage capacitor charging curve of the prior art, wherein time t 0-t 1 corresponds to a pre-charging stage. The curve S1 corresponds to the technical scheme of the prior art without voltage pre-charging, and the curve S1 is charged to V DATA(i) -|V th The required time is t13; curve S2 corresponds to the prior artIn the second possible solution (for example, the above-mentioned solution), the voltage is precharged by charging to V in the curve S2 DATA(i) -|V th The required time is t12; the curve S3 corresponds to the technical solution provided in the embodiment of the present application, and the charging is performed to V in the curve S3 DATA(i) -|V th The required time is t11. Shown in the figure, t11<t12<t13, that is, the time required for writing the data voltage in the data writing stage is the minimum in the technical solution provided in the embodiment of the present application, and compared with the prior art, the charging time of the storage capacitor C1 can be effectively shortened. As the resolution and/or refresh frequency increases, it is also ensured that the data voltage is completely written into the storage capacitor C1 during the data writing phase.
In the light-emitting period T13, the first Scan line Scan (j-1) inputs a high level signal, and the third transistor M3, the third transistor M4 and the ninth transistor M9 are turned off; a high-level signal is input into the second scanning line Scan (j), and the first transistor M1, the sixth transistor M6 and the seventh transistor M7 are turned off; the enable signal line EM receives a high-level signal, and the fifth transistor M5 and the eighth transistor M8 are turned on. The power signal line provides the power signal VDD, which is input to the anode of the OLED light emitting device through the fifth transistor M5, the second transistor M2, and the eighth transistor M8, the cathode of the OLED light emitting device is grounded, and the second transistor M2 drives the OLED light emitting device to emit light. At this stage, the voltage V stored by the storage capacitor C1 DATA(i) -|V th If the second transistor M2 is driven by a stable driving current to emit light, even if the scanning time of each row is compressed, the storage capacitor C1 can be rapidly charged to V in a short time by the technical solution provided in this embodiment at a high refresh rate DATA(i) -|V th And the grid voltage of the second transistor M2 is stored and stored in the light-emitting stage, so that the light-emitting of the OLED light-emitting device is ensured to be emitted under sufficient driving current for light-emitting display, and the display uniformity of the display equipment is optimized.
The embodiment of the present application further provides a pixel driving method, which can be applied to the display panel 10 described in the above embodiment. The display panel 10 includes a pixel driving circuit 100 and a display driving chip 200, and the pixel driving circuit 100 may include a pre-charging unit 110, a data writing unit 120, a pixel driving unit 130, a voltage storage unit 140, and a pixel light emitting unit 150.
Referring to fig. 8 and fig. 8 show a flow chart of a pixel driving method, the pixel driving method provided in this embodiment may include the following steps.
In the step S101, in the pre-charging stage, the display driving chip 200 determines a charging voltage Vn based on a variation between the gray-level value displayed by the pixel light-emitting unit 150 in the previous frame and the gray-level value in the frame to be displayed currently, and controls the pre-charging unit 110 to pre-charge the voltage storage unit 140 with the determined charging voltage Vn.
Specifically, referring to fig. 5 and 6, for example, the gray level in the previous frame is 0 (corresponding to V) DATA(i-1) 6V) and the gray level in the current frame is 255 (corresponding to V) DATA(i) 0V), the precharge voltage Vn needs to be as large as possible, and Vn = V may be set, for example DATA(i-1)- |V th L, wherein V th For the turn-on voltage of the second transistor M2, assume V th about-2V, then Vn can reach 4V, at V th Vn can be set to even higher voltages when there is a change in stability and characteristics. In this case, the precharge time of the storage capacitor C1 may be insufficient, and Vn may not be equal to Vc, for example Vc may be less than Vn.
As another example, the gray-level value in the previous frame is 255 (corresponding to V) DATA(i-1) 0V) and the gray level in the current frame is 0 (corresponding to V) DATA(i) 6V), the precharge voltage Vn needs to be as small as possible, and the voltage Vn can be set to-3V or lower so that the voltage at the Q point at the end of the storage capacitor C1 is quickly charged to Vc. In this case, the precharge time for the storage capacitor C1 may be insufficient, and Vn may not be equal to Vc, for example Vc may be greater than Vn.
As another example, the gray-level value in the previous frame is 128 (corresponding to V) DATA(i-1) 4V) and the gray level value in the current frame is 160 (corresponding to V) DATA(i) 3.5V), a precharge voltage Vn = V may be set DATA(i) -|Vth|-V buffer In which V is buffer For a reserve voltage, V is generally set buffe r is the voltage which can be written completely in the data writing stage ， Since the gray-level values in the previous and subsequent frames do not change much, the storage capacitor C1 can be completely written with Vn during the precharge phase, i.e., vn = Vc, and the voltage V is written with the data writing phase buffer And (4) finishing. It is also possible to set the precharge voltage Vn to a fixed voltage, for example, vn can be held at V DATA(i-1) Or Vn may set the average of the maximum data voltage and the minimum data voltage. In this case, the precharge time for the storage capacitor C1 may be sufficient, i.e., vn = Vc.
In step S102, in the data writing phase, the data writing unit 120 is controlled to write the data voltage to the pixel driving unit 130 and the voltage storage unit 140, wherein the voltage storage unit 140 is used for storing the data voltage.
In step S103, in the light emitting phase, the pixel driving unit 130 is controlled to drive the pixel light emitting unit 150 to emit light according to the data voltage stored in the voltage storage unit 140.
In one implementation manner of the embodiment of the present application, the display panel 10 further includes an initialization unit 160, and the pixel driving method further includes: in the precharge phase, the control initialization unit 160 initializes the voltage of the pixel light emitting unit 150.
The embodiment of the present application further provides an electronic device, where the electronic device includes the display panel 10 provided in the embodiment of the present application, and by using the display panel 10, the electronic device can have a good display uniformity effect in an application scene (for example, a game screen) with a high refresh frequency, so that the use experience of a user is improved, and the market competitiveness of the electronic device is increased. In the embodiment of the present application, the electronic device may be a mobile phone, a tablet computer, a notebook computer, and the like.
The embodiment of the application provides a display panel, a pixel driving method and an electronic device. The charging voltage can be determined by the display driving chip based on the variation between the gray value of the pixel light-emitting unit in the previous frame and the gray value of the frame to be displayed currently, and the voltage storage unit is precharged in the precharge stage based on the determined charging voltage, so that the voltage storage unit can be rapidly charged to the compensated data voltage in a short time in the data writing stage, and the pixel driving unit can be ensured to drive the pixel light-emitting unit to emit light by adopting sufficient driving current in the light-emitting stage. Therefore, the technical problem that the voltage storage unit is insufficiently charged in the data writing stage can be solved, and the display uniformity effect of the display panel is ensured when the resolution and/or the refreshing frequency are/is improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (7)

1. A display panel is characterized by comprising a display driving chip and a plurality of pixel rows, wherein each pixel row comprises a plurality of sub-pixels, each sub-pixel comprises a pixel driving circuit, and each pixel driving circuit comprises a pre-charging unit, a data writing unit, a pixel driving unit, a voltage storage unit and a pixel light-emitting unit;
the data writing unit is respectively connected with the pixel driving unit and the voltage storage unit and is used for writing data voltage into the pixel driving unit and the voltage storage unit in a data writing stage;
the voltage storage unit is used for storing the data voltage;
the pixel driving unit is connected with the pixel light-emitting unit and used for driving the pixel light-emitting unit to emit light according to the data voltage stored in the voltage storage unit in a light-emitting stage;
the display driving chip is used for determining the charging voltage based on the variation between the gray value of the pixel light-emitting unit in the previous frame picture and the gray value of the current frame picture to be displayed when the variation between the gray value of the pixel light-emitting unit in the previous frame picture and the gray value of the current frame picture to be displayed is outside a set gray value variation interval; when the variation between the gray value of the pixel light-emitting unit in the previous frame and the gray value of the current frame to be displayed is in the set gray value variation interval, determining a fixed voltage as the charging voltage;
the pre-charging unit is connected with the voltage storage unit and the display driving chip and is used for pre-charging the voltage storage unit according to the charging voltage determined by the display driving chip in a pre-charging stage;
the data writing unit comprises a first transistor, a sixth transistor and a seventh transistor, the pixel driving unit comprises a second transistor, the pre-charging unit comprises a third transistor and a fourth transistor, the pixel light-emitting unit comprises an OLED light-emitting device, a fifth transistor and an eighth transistor, and the voltage storage unit comprises a storage capacitor;
an input electrode of the first transistor is connected with a data line, an output electrode of the first transistor is connected with an input electrode of the second transistor, and a control electrode of the first transistor is connected with a second scanning line;
an input electrode of the seventh transistor is connected to an output electrode of the second transistor, an output electrode of the seventh transistor is connected to an input electrode of the sixth transistor, an output electrode of the sixth transistor is connected to the first end of the storage capacitor, and a control electrode of the sixth transistor and a control electrode of the seventh transistor are connected to the second scan line;
the input electrode of the second transistor is further connected with a power line through the fifth transistor, the output electrode of the second transistor is connected with the first electrode of the OLED light-emitting device, the control electrode of the second transistor is connected with the first end of the storage capacitor, the second end of the storage capacitor is connected with the power line, the second electrode of the OLED light-emitting device is grounded, and the control electrode of the fifth transistor is connected with an enable signal line;
an input electrode of the third transistor is connected to a precharge line, an output electrode of the third transistor is connected to an input electrode of the fourth transistor, an output electrode of the fourth transistor is connected to a first end of the storage capacitor, and a control electrode of the third transistor and a control electrode of the fourth transistor are connected to a first scan line;
an input electrode of the eighth transistor is connected with an output electrode of the second transistor, an output electrode of the eighth transistor is connected with the first electrode of the OLED light-emitting device, and a control electrode of the eighth transistor is connected with an enable signal line.
2. The display panel according to claim 1, wherein the pixel drive circuit further includes an initialization unit;
the initialization unit is connected with the pixel light-emitting unit and used for initializing the voltage of the pixel light-emitting unit in the pre-charging stage.
3. The display panel according to claim 1 or 2, wherein the voltage storage unit stores the voltage during the precharge phase not greater than a difference between the data voltage and an absolute value of a turn-on voltage of the pixel driving unit.
4. The display panel according to claim 2, wherein the initialization unit further includes a ninth transistor;
an input electrode of the ninth transistor is connected to a reset voltage line, an output electrode of the ninth transistor is connected to the first electrode of the OLED light emitting device, and a control electrode of the ninth transistor is connected to the first scan line.
5. A pixel driving method applied to the display panel according to any one of claims 1 to 4, the method comprising:
in a pre-charging stage, the display driving chip determines a charging voltage and controls the pre-charging unit to pre-charge the voltage storage unit by using the determined charging voltage, wherein the display driving chip is used for determining the charging voltage based on a variation between a gray value of the pixel light-emitting unit in a previous frame of picture and a gray value of a current frame of picture to be displayed when the variation between the gray value of the pixel light-emitting unit in the previous frame of picture and the gray value of the current frame of picture to be displayed is outside a set gray value variation interval; when the variation between the gray value of the pixel light-emitting unit in the previous frame and the gray value of the current frame to be displayed is in the set gray value variation interval, determining a fixed voltage as the charging voltage;
in a data writing phase, controlling the data writing unit to write a data voltage into the pixel driving unit and the voltage storage unit, wherein the voltage storage unit is used for storing the data voltage;
and in the light-emitting stage, controlling the pixel driving unit to drive the pixel light-emitting unit to emit light according to the data voltage stored in the voltage storage unit.
6. The pixel driving method according to claim 5, wherein the display panel further includes an initialization unit, the method further comprising:
and in the pre-charging stage, controlling the initialization unit to initialize the voltage of the pixel light-emitting unit.
7. An electronic device, characterized in that the electronic device comprises a display panel according to any one of claims 1-4.
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