CN115019733A - Pixel driving circuit, method and display panel - Google Patents
Pixel driving circuit, method and display panel Download PDFInfo
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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
- 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
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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
- 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
- G09G3/3258—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 voltage across the light-emitting element
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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
- 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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Abstract
The application relates to a pixel driving circuit, a pixel driving method and a display panel, wherein the pixel driving circuit compensates a compensation capacitor through a first compensation unit according to data voltage, the compensation capacitor is compensated through a second compensation unit according to a sub-pixel, and then a driving switch is maintained to be in a conducting state through the compensation capacitor, so that current passing through the driving switch is only related to the data voltage, the stability of the current passing through the driving switch is improved, the current passing through the driving switch is not affected by the power voltage and the threshold voltage of the driving switch, the display brightness fluctuation caused by the power voltage fluctuation or the threshold voltage drift of the driving switch is avoided, the problem that the display panel displays non-uniformly is avoided, and the display effect is improved.
Description
Technical Field
The present disclosure relates to the field of display panel technologies, and in particular, to a pixel driving circuit and method and a display panel.
Background
Due to the rapid progress of the multimedia society, the technology of semiconductor devices and display devices has also been dramatically advanced. In terms of the display, the Active Matrix Organic Light Emitting Diode (AMOLED) display has advantages of no viewing angle limitation, low manufacturing cost, high response speed (about hundred times of liquid crystal), power saving, self-luminescence, direct current driving applicable to portable devices, large working temperature range, Light weight, and miniaturization and thinning along with hardware devices, so as to meet the characteristic requirements of the display in the multimedia era. Therefore, the active matrix organic light emitting diode Display has great potential for development, and is expected to become a new flat panel Display of the next generation, thereby replacing a Liquid Crystal Display (LCD).
Currently, there are two main manufacturing methods for the active matrix organic light emitting diode display panel, one is manufactured by using a Low Temperature Polysilicon (LTPS) Thin Film Transistor (TFT) process technology, and the other is manufactured by using an amorphous silicon (a-Si) Thin Film Transistor (TFT) process technology. In which, the cost is increased because the tft process technology of low temperature polysilicon requires a plurality of mask processes. Therefore, the current low temperature polysilicon thin film transistor fabrication technology is mainly applied to small and medium sized panels, and the amorphous silicon thin film transistor fabrication technology is mainly applied to large sized panels.
Generally, in an active matrix organic light emitting diode display panel manufactured by using a low temperature polysilicon thin film transistor process technology, the type of a thin film transistor in a pixel circuit may be P-type or N-type, however, under the condition that the thin film transistor is selected to realize the organic light emitting diode pixel circuit, the current flowing through the organic light emitting diode varies with the threshold voltage shift (Vth shift) of a driving switch for driving the organic light emitting diode. Therefore, the brightness uniformity of the organic light emitting diode display is affected.
Disclosure of Invention
The application provides a pixel driving circuit, a pixel driving method and a display panel, which are used for solving the problem of uneven display of the display panel caused by threshold voltage drift of a driving switch in the related technology.
In a first aspect, the present application provides a pixel driving circuit comprising: reset unit, compensation unit, luminescence unit, be provided with compensation capacitance on the reset unit, the compensation unit includes: the light-emitting unit is provided with a driving switch, the driving switch is connected with the sub-pixels, the control end of the driving switch is connected with the compensation capacitor arranged on the reset unit, the output end of the driving switch is connected with the first compensation unit, and one end of the reset unit is connected with power supply voltage; the reset unit is used for resetting the control end of the driving switch and the compensation capacitor according to the power supply voltage; the first compensation unit is used for carrying out potential compensation on the compensation capacitor according to data voltage, and the second compensation unit is used for carrying out potential compensation on the compensation capacitor according to the driving potential of the sub-pixel; the compensation capacitor is used for conducting the driving switch after potential compensation is carried out; the light-emitting unit is used for driving the sub-pixels to emit light when the driving switch is switched on.
In some examples, one end of the first compensation unit is connected to the data voltage, and the other end of the first compensation unit is connected to the output end of the driving switch; and when the first compensation unit is conducted, the data voltage is transmitted to the output end of the driving switch so as to perform potential compensation on the compensation capacitor connected with the control end of the driving switch.
In some examples, one end of the second compensation unit is connected to the anode of the sub-pixel through the light emitting unit, and the other end of the second compensation unit is connected to the reset unit, and the second compensation unit is configured to perform potential compensation on the compensation capacitor according to a driving potential of the sub-pixel.
In some examples, the light emitting unit further includes: a first thin film transistor, a fifth thin film transistor; the input end of the first thin film transistor is connected with the data voltage, the output end of the first thin film transistor is connected with the input end of the driving switch, the input end of the fifth thin film transistor is connected with the output end of the driving switch, and the output end of the fifth thin film transistor is connected with the sub-pixel; the reset unit includes: a third thin film transistor and a seventh thin film transistor; the compensation capacitor is arranged between the output end of the third thin film transistor and the input end of the seventh thin film transistor, and the output end of the seventh thin film transistor is connected with the ground; the input end of the third thin film transistor is connected with the first thin film transistor through a connection point D on the light-emitting unit, a connection point G is arranged between the output end of the third thin film transistor and the compensation capacitor, and the control end of the driving switch is connected with the compensation capacitor through the connection point G; a fourth thin film transistor is arranged on the first compensation unit, the input end of the fourth thin film transistor is connected with the data voltage, and the output end of the fourth thin film transistor is connected with the output end of the driving switch; a sixth thin film transistor is arranged on the second compensation unit, one end of the sixth thin film transistor is connected with the point of connection S on the light-emitting unit, and the other end of the sixth thin film transistor is connected with the point of connection A on the reset unit; the S connection point is provided between the sub-pixel and the fifth thin film transistor, and the a connection point is provided between the seventh thin film transistor and the compensation capacitor.
In some examples, a control terminal of the fourth thin film transistor is connected to a first control signal; the control end of the fifth thin film transistor is connected with a second control signal; the control ends of the first thin film transistor and the sixth thin film transistor are connected with a third control signal; and the control ends of the third thin film transistor and the seventh thin film transistor are connected with a seventh control signal.
In some examples, when the first to seventh thin film transistors and the driving switch are the same type of thin film transistor, the second and fourth control signals are inversion signals, and the first and third control signals are inversion signals.
In a second aspect, the present application provides a pixel driving method applied to the pixel driving circuit as described in any one of the above, the pixel driving method comprising: in the resetting stage, resetting a control end of a driving switch and a compensation capacitor on a resetting unit through the resetting unit; in the compensation stage, the compensation capacitor is subjected to potential compensation through a first compensation unit, and after the compensation of the first compensation unit, the compensation capacitor is subjected to potential compensation through a second compensation unit; and in the light-emitting stage, the light-emitting unit is conducted through the compensation capacitor, and the sub-pixel is driven to emit light through the light-emitting unit.
In a third aspect, there is provided a display panel including: the display device comprises a substrate, a plurality of sub-pixels arranged on the substrate, and the pixel driving circuit as described in any one of the above, wherein the pixel driving circuit is connected with the sub-pixels to drive the sub-pixels to emit light.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the pixel driving circuit provided by the embodiment of the application comprises: reset unit, compensation unit, luminescence unit, be provided with compensation capacitance on the reset unit, the compensation unit includes: the light-emitting unit is provided with a driving switch and sub-pixels, the control end of the driving switch is connected with the compensation capacitor arranged on the reset unit, the output end of the driving switch is connected with the first compensation unit, and one end of the reset unit is connected with a power supply voltage; the reset unit is used for resetting the control end of the driving switch and the compensation capacitor according to the power supply voltage; the first compensation unit is used for carrying out potential compensation on the compensation capacitor according to data voltage, and the second compensation unit is used for carrying out potential compensation on the compensation capacitor according to the driving potential of the sub-pixel; the compensation capacitor is used for conducting the driving switch after the line potential compensation; the light-emitting unit is used for driving the sub-pixels to emit light when the driving switch is switched on, the compensation capacitor is compensated through the first compensation unit according to data voltage, the compensation capacitor is compensated through the second compensation unit according to the sub-pixels, the driving switch is maintained in a conducting state through the compensation capacitor, current passing through the driving switch is only related to the data voltage, the stability of the current passing through the driving switch is improved, the current passing through the driving switch is not affected by power voltage and threshold voltage of the driving switch, display brightness fluctuation caused by power voltage fluctuation or threshold voltage drift of the driving switch is avoided, the problem that a display panel displays non-uniformly is avoided, and the display effect is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic diagram of a basic structure of an alternative pixel driving circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a basic structure of yet another alternative pixel driving circuit according to an embodiment of the present disclosure;
fig. 3 is a basic schematic diagram of a timing sequence of an optional signal in a pixel driving circuit according to a second embodiment of the present application;
fig. 4 is a conducting schematic diagram of a pixel driving circuit in an optional reset phase according to a second embodiment of the present disclosure;
fig. 5 is a conducting schematic diagram of a pixel driving circuit in an optional compensation phase according to a second embodiment of the present disclosure;
fig. 6 is a conducting schematic diagram of a pixel driving circuit in an optional light-emitting phase according to a second embodiment of the present disclosure;
fig. 7 is a schematic basic flowchart of a pixel driving method according to a third embodiment of the present application;
fig. 8 is a schematic diagram of a basic structure of a display panel according to a fourth embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a display device according to a fifth embodiment of the present application;
description of reference numerals:
1. a reset unit; 21-a first compensation unit; 22-a second compensation unit; 3. a light emitting unit; 4. a sub-pixel; 5. a substrate; 6. a pixel drive circuit; c1 — compensation power supply; m1, a first thin film transistor; m2, a drive switch; m3, a third thin film transistor; m4, a fourth thin film transistor; m5, a fifth thin film transistor; m6, a sixth thin film transistor; m7, a seventh thin film transistor; VDD, supply voltage; vss, ground; vdata, data voltage; SEL1, a first control signal; SEL2, second control signal; SEL3, third control signal; SEL4, fourth control signal.
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. 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.
Example one
In order to solve the problem of uneven display of the display panel caused by the drift of the threshold voltage of the driving switch in the related art, please refer to fig. 1, in which fig. 1 is a pixel driving circuit provided in an embodiment of the present application, the pixel driving circuit includes: the pixel driving circuit includes: reset unit 1, compensation unit, luminescence unit 3, be provided with compensation capacitance C1 on the reset unit 1, the compensation unit includes: a first compensation unit 21 and a second compensation unit 22, wherein a driving switch M2 is disposed on the light emitting unit 3, the driving switch M2 is connected to the sub-pixel 4, a control terminal of the driving switch M2 is connected to the compensation capacitor C1 disposed on the reset unit 1, an output terminal of the driving switch M2 is connected to the first compensation unit 21, and one terminal of the reset unit 1 is connected to a power supply voltage VDD; the reset unit 1 is used for resetting the control terminal of the driving switch M2 and the compensation capacitor C1 according to the power supply voltage VDD; the first compensation unit 21 is used for compensating the potential of the compensation capacitor C1 according to the data voltage Vdata, and the second compensation unit 22 is used for compensating the potential of the compensation capacitor C1 according to the driving potential of the sub-pixel 4; the compensation capacitor C1 is used for conducting the driving switch M2 after potential compensation; the light emitting unit 3 is used for driving the sub-pixel 4 to emit light when the driving switch M2 is turned on.
As shown in fig. 1, one end of each of the reset unit 1 and the light-emitting unit 3 is connected to a power supply voltage VDD, and the other end of each of the reset unit 1 and the light-emitting unit 3 is connected to a ground Vss; it should be understood that the driving switch M2 is connected to the sub-pixel 4 to control the current flowing through the sub-pixel 4, specifically, the driving switch M2 controls the current flowing through itself to control the current flowing through the sub-pixel 4, and the current I =1/2 × μ × W/L × C _ GI × (V _ GS- | V _ th |) > 2 through the driving switch M2, where μ is the carrier mobility, W is the channel width, L is the channel length, C _ GI is the gate capacitance, Vth is the threshold voltage, where V _ GS = the voltage at the output of the control terminal voltage V _ G of the driving switch M2-the output terminal of the driving switch M2, W, L is fixed at design time, and C _ GI depends on the gate insulating layer thickness and the material. Therefore, the current flowing through the driving switch M2 is related to the threshold voltage Vth, the control terminal voltage V _ G of the driving switch M2 and the voltage at the output terminal of the driving switch M2;
it should be understood that, taking a frame of display signal as an example, in one period, the pixel driving circuit provided in this embodiment needs to go through three stages of reset, compensation and light emission;
in the reset stage, the reset unit 1 resets the control terminal of the driving switch M2 and the compensation capacitor C1 according to the power voltage VDD, so that the voltages of the control terminal V _ G of the driving switch M2 and the compensation capacitor C1 are both the power voltage VDD;
in the compensation stage, the first compensation unit 21 is configured to perform voltage compensation on the compensation capacitor C1 according to the data voltage Vdata, so that the voltage at the control end of the driving switch M2 and the voltage at the compensation capacitor C1 are the sum of the threshold voltage Vth of the driving switch M2 and the data voltage Vdata;
in the light emitting period, the compensation capacitor C1 firstly turns on the driving switch M2 to drive the sub-pixel 4, and at this time, the second compensation unit 22 is configured to perform the potential compensation on the compensation capacitor C1 according to the sub-pixel 4, so that the voltage of the compensation capacitor C1 is the threshold voltage Vth of the driving switch M2 + the data voltage Vdata + the driving voltage Voled of the sub-pixel 4; when the compensation capacitor C1 keeps turning on the driving switch M2, the voltage received by the control terminal of the driving switch M2 is the threshold voltage Vth + the data voltage Vdata + the driving voltage Voled of the sub-pixel 4, and since the output terminal of the driving switch M2 is connected to the sub-pixel 4, the voltage V _ s at the output terminal of the driving switch M2 = the driving potential Voled of the sub-pixel 4, the current I flowing through the driving switch M2 is as follows:
i =1/2 × μ × W/L × C _ GI × (V _ gs-V _ th) ^2, where V _ gs = V _ G-V _ S, then further, the equation can be converted to the following equation;
=1/2 × μ × W/L × C _ GI × (V _ G-V _ S-V _ th) ^2, where when the compensation capacitor C1 is driven, the control terminal voltage V _ G of the drive switch M2 = the threshold voltage Vth of the drive switch M2 + the data voltage Vdata + the drive potential Voled of the subpixel 4, and the voltage V _ S of the output terminal of the drive switch M2 = the drive potential Voled of the subpixel 4, the equation can be further converted into the following equation;
=1/2 × μ × W/L × C _ GI × (V _ TH + V _ Data + V _ VOLED-V _ TH) ^2, then the equation can be further simplified as follows;
=1/2×μ×W/L×C_GI×（V_Data ）^2；
according to the above formula, in the pixel driving circuit provided in this embodiment, the compensation capacitor C1 is compensated by the first compensation unit 21 according to the data voltage Vdata, and after the compensation capacitor C1 is compensated by the second compensation unit 22 according to the sub-pixel 4, the compensation capacitor C1 maintains the driving switch M2 in the on state, so that the current passing through the driving switch M2 is only related to the data voltage Vdata, thereby improving the stability of the current passing through the driving switch M2, preventing the current passing through the driving switch M2 from being affected by the power voltage VDD and the threshold voltage of the driving switch M2, avoiding the display luminance fluctuation caused by the power voltage fluctuation or the threshold voltage drift of the driving switch M2, further avoiding the problem of non-uniform display on the display panel, and improving the display effect.
In some examples of the present embodiment, as shown in fig. 2, one end of the first compensation unit 21 is connected to the data voltage Vdata, and the other end of the first compensation unit 21 is connected to the output end of the driving switch M2 through the light emitting unit 3; when turned on, the first compensation unit 21 transmits the data voltage Vdata to the output terminal of the driving switch M2 to perform potential compensation on the compensation capacitor C1 connected to the control terminal of the driving switch M2. It can be understood that the control terminal voltage V _ G of the drive switch M2 = the voltage at the output terminal of the drive switch M2 + the threshold voltage Vth; when the first compensation unit 21 is turned on, the data voltage Vdata is transmitted to the output end of the driving switch M2, so that the voltage at the output end of the driving switch M2 is the data voltage Vdata, the voltage at the control end of the driving switch M2 is the data voltage Vdata + the threshold voltage Vth, the control end of the driving switch M2 is connected to the compensation capacitor C1 disposed on the reset unit 1, and the compensation capacitor C1 is subjected to potential compensation through the reset unit 1, so that the voltage of the compensation capacitor C1 is synchronized to the data voltage Vdata + the threshold voltage Vth.
In some examples of the present embodiment, as shown in fig. 2, one end of the second compensation unit 22 is connected to the anode of the sub-pixel 4 through the light emitting unit 3, the other end of the second compensation unit 22 is connected to the reset unit 1, and the second compensation unit 22 is configured to perform potential compensation on the compensation capacitor C1 according to the sub-pixel 4. It should be understood that, during the light emitting period, the light emitting unit 3 drives the sub-pixel 4, so that when the sub-pixel 4 emits light, the second compensation unit 22 is connected to the anode of the sub-pixel 4, the second compensation unit 22 equalizes the driving voltage of the sub-pixel 4 to the compensation capacitor C1, performs potential compensation on the compensation capacitor C1, and further compensates the voltage of the compensation capacitor C1 to the data voltage Vdata + the threshold voltage Vth + the driving voltage Voled of the sub-pixel 4, so that the second compensation circuit 22 can accurately obtain the driving voltage Voled of the sub-pixel 4 to compensate the compensation capacitor C1.
It can be understood that each of the TFTs described in this embodiment may be a P-type thin-film transistor (P-type TFT) or an N-type TFT (N-type TFT), and this embodiment does not limit the type of the TFT, and when any one of the TFTs in the pixel driving circuit is replaced by an N-type TFT, it is only necessary to perform inversion processing on the level signal of the control timing of the TFT; similarly, when any thin film transistor in the pixel driving circuit is changed from an N-type thin film transistor to a P-type thin film transistor, the level signal of the control time sequence of the thin film transistor only needs to be subjected to phase inversion processing; meanwhile, the thin film transistor provided in this embodiment may be manufactured by using a Low Temperature Polysilicon (LTPS), amorphous silicon (a-Si), or a Thin Film Transistor (TFT) process technology of amorphous indium gallium tin oxide (a-IGZO), but is not limited thereto. The present embodiment will be described with the first thin film transistor M1, the third thin film transistor M3, the fourth thin film transistor M4, the fifth thin film transistor M5, the sixth thin film transistor M6 and the seventh thin film transistor M7 all being N-type thin film transistors.
In some examples of the present embodiment, as shown in fig. 2, the light emitting unit 3 further includes: a first thin film transistor M1, a fifth thin film transistor M5; an input end of the first thin film transistor M1 is connected to the data voltage Vdata, an output end of the first thin film transistor M1 is connected to an input end of the driving switch M2, an input end of the fifth thin film transistor M5 is connected to an output end of the driving switch M2, and an output end of the fifth thin film transistor M5 is connected to the sub-pixel 4;
when the first thin film transistor M1 is turned on, the connection between the power supply voltage VDD and the driving switch M2 is turned on, and the current of the power supply end is further transmitted to the input end of the driving switch M2, and when the first thin film transistor M1 is turned off, the connection between the power supply voltage VDD and the driving switch M2 is turned off, and the transmission of the current of the power supply end to the input end of the driving switch M2 is stopped; the fifth thin film transistor M5 is used for turning on the connection between the driving switch M2 and the sub-pixel 4 when being turned on, and transmitting the current transmitted by the driving light-on output end to the sub-pixel 4 to drive the sub-pixel 4 to emit light, and the fifth thin film transistor M5 is used for turning off the connection between the driving switch M2 and the sub-pixel 4 when being turned off, and no current flows through the sub-pixel 4, so that the sub-pixel 4 does not emit light, and further, the sub-pixel 4 is prevented from emitting light by mistake in the reset and compensation stages, and the effects of reducing power consumption and improving the aging of the OLED are achieved; it should be understood that, in some examples, the first thin film transistor M1 is not provided in the light emitting cell 3, but the input terminal of the driving switch M2 is directly connected to the power supply voltage VDD.
In some examples of the present embodiment, the reset unit 1 includes: a third thin film transistor M3, a seventh thin film transistor M7; the compensation capacitor C1 is arranged between the output end of the third thin film transistor M3 and the input end of the seventh thin film transistor M7, and the output end of the seventh thin film transistor M7 is connected with the ground Vss; an input end of the third thin film transistor M3 is connected to the first thin film transistor M1 through a D connection point on the light emitting unit 3, a G connection point is provided between an output end of the third thin film transistor M3 and the compensation capacitor C1, and a control end of the driving switch M2 is connected to the compensation capacitor C1 through the G connection point;
wherein, the input end of the third thin film transistor M3 is connected to the first thin film transistor M1 through the D connection point on the light emitting unit 3, that is, the third thin film transistor M3 is connected to the first thin film transistor M1 through the D connection point, so as to achieve the effect that the third thin film transistor M3 is connected to the power voltage VDD through the first thin film transistor M1, and then the first thin film transistor M1 is turned on to connect the power voltage VDD to the reset unit 1, and then transmit the power voltage VDD to the reset unit 1, and when turned off, the connection between the power voltage VDD and the driving switch M2 is cut off to stop transmitting the power voltage VDD to the reset unit 1, thereby realizing a multiplexing of the first thin film transistor M1, the third thin film transistor M3, the compensating capacitor C1, and the seventh thin film transistor M7 are sequentially connected, and when the third thin film transistor M3 is turned on, transmitting the data voltage Vdata to the compensation capacitor C1 to compensate the voltage of the compensation capacitor C1 to the data voltage Vdata; the seventh thin film transistor M7 is connected with the ground Vss and is used for pulling down the potential of the compensation capacitor C1 when the seventh thin film transistor is conducted;
as for the above example, in the reset phase, specifically, the third tft M3 and the seventh tft M7 are turned on simultaneously, the third tft M3 transmits the power voltage VDD to the compensation capacitor C1, and the seventh tft M7 is turned on and electrically connected to connect the compensation capacitor C1 to the ground Vss, at this time, the voltage of the compensation capacitor C1 near the end of the third tft M3 is the power voltage VDD, and the voltage of the compensation capacitor C1 near the end of the seventh tft M7 tends to zero; the control end of the driving switch M2 is connected with the compensation capacitor C1 through the G connection point, so that the control end voltage of the driving switch M2 is also the power voltage VDD; meanwhile, in this stage, the fifth thin film transistor M5 is in an off state, the connection between the driving switch M2 and the sub-pixel 4 is disconnected, no current flows through the sub-pixel 4, so that the sub-pixel 4 does not emit light, and the sub-pixel 4 is prevented from emitting light by mistake in the reset and compensation stages, thereby achieving the effects of reducing power consumption and improving the aging of the OLED.
It should be understood that, in some examples, the third thin film transistor M3 is directly connected to the power voltage VDD, and is not connected to the first thin film transistor M1 through a D connection point on the light emitting unit 3, and is connected to the power voltage VDD;
in some examples of the present embodiment, a fourth thin film transistor M4 is disposed on the first compensation unit 21, an input terminal of the fourth thin film transistor M4 is connected to the data voltage, and an output terminal of the fourth thin film transistor M4 is connected to an output terminal of the driving switch M2; a sixth thin film transistor M6 is disposed on the second compensation unit 22, one end of the sixth thin film transistor M6 is connected to the S connection point on the light emitting unit 3, and the other end of the sixth thin film transistor M6 is connected to the a connection point on the reset unit 1; the S connection point is disposed between the sub-pixel 4 and the fifth thin film transistor M5, and the a connection point is disposed between the seventh thin film transistor M7 and the compensation capacitor C1. The fourth thin film transistor M4 is used for transmitting the data voltage Vdata to the output terminal of the driving switch M2 when being turned on, and the fourth thin film transistor M4 is used for stopping transmitting the data voltage Vdata to the output terminal of the driving switch M2 when being turned off; the sixth thin film transistor M6 is in a short circuit state when being turned on, at this time, two ends of the sixth thin film transistor M6 have the same potential, that is, two ends of the sixth thin film transistor M6 have the same potential, and therefore, the sixth thin film transistor M6 is used for transmitting the driving voltage of the sub-pixel 4 to the compensation capacitor C1 when being turned on, and the sixth thin film transistor M6 is used for stopping transmitting the driving voltage of the sub-pixel 4 to the compensation capacitor C1 when being turned off; it can be understood that, when the sixth thin film transistor M6 is turned on, the short circuit is conducted to achieve the same potential, and further, the driving voltage of the sub-pixel 4 is transmitted to the compensation capacitor C1, so the connection manner of the connection point of the sixth thin film transistor M6 and the connection point A, S is not limited in this embodiment, and one end of the sixth thin film transistor M6 may be connected to the connection point a, and the other end of the sixth thin film transistor M6 may be connected to the connection point S.
As for the above example, in the compensation phase, the fourth thin film transistor M4 is turned on, and the data voltage Vdata is transmitted to the output end of the driving switch M2, so that the voltage at the output end of the driving switch M2 is the data voltage Vdata, and in the compensation phase, the third thin film transistor M3 is also in the on state, at this time, the driving switch M2 forms a diode connection through the third thin film transistor M3, so that the voltage at the control end of the driving switch M2 is the data voltage Vdata + the threshold voltage Vth, and the control end of the driving switch M2 is connected to the compensation capacitor C1 through the reset unit 1, so that the compensation capacitor C1 is subjected to potential compensation through the reset unit 1, and the voltage of the compensation capacitor C1 is synchronized to the data voltage Vdata + the threshold voltage Vth. Meanwhile, in this stage, the fifth thin film transistor M5 is in an off state, the connection between the driving switch M2 and the sub-pixel 4 is disconnected, no current flows through the sub-pixel 4, so that the sub-pixel 4 does not emit light, and the sub-pixel 4 is prevented from emitting light by mistake in the reset and compensation stages, thereby achieving the effects of reducing power consumption and improving the aging of the OLED. In the light emitting period, the first thin film transistor M1, the fifth thin film transistor M5 and the sixth thin film transistor M6 are in an on state, the sixth thin film transistor M6 connects the second compensation unit 22 with the anode of the sub-pixel 4, the second compensation unit 22 equalizes the driving voltage of the sub-pixel 4 to the compensation capacitor C1, performs potential compensation on the compensation capacitor C1, and further compensates the voltage of the compensation capacitor C1 to the data voltage Vdata + the threshold voltage Vth + the driving voltage Voled of the sub-pixel 4.
In some examples of the present embodiment, as shown in fig. 2, a control terminal of the fourth thin film transistor M4 is connected to a first control signal SEL 1; the control end of the fifth thin film transistor M5 is connected to a second control signal SEL 2; the control ends of the first thin film transistor M1 and the sixth thin film transistor M6 are connected to a third control signal SEL 3; the control ends of the third thin film transistor M3 and the seventh thin film transistor M7 are connected with a seventh control signal, so that multiplexing of the control signals is realized, a circuit corresponding to an independent control signal is prevented from being arranged for each transistor, and the pixel aperture opening ratio is improved. And when the first to seventh thin film transistors M1 to M7 and the driving switch M2 are all the same type of thin film transistors, the first control signal SEL1 and the fourth control signal SEL4 are reverse signals, and the second control signal SEL2 and the third control signal SEL3 are reverse signals; for example, at the same time, if the first control signal SEL1 is a low-level signal, the fourth control signal SEL4 is a high-level signal; the second control signal SEL2 is a low signal, and the third control signal SEL3 is a high signal. For another example, at the same time, the first control signal SEL1 is a high-level signal, and the fourth control signal SEL4 is a low-level signal; the second control signal SEL2 is a high signal, and the third control signal SEL3 is a low signal.
Bearing in mind the above example, it can be understood that in some examples, each thin film transistor in the driving circuit of the sub-pixel 4 is individually connected to a control signal, so as to achieve more precise control.
The pixel driving circuit provided by the embodiment comprises: reset unit, compensation unit, luminescence unit, be provided with compensation capacitance on the reset unit, the compensation unit includes: the light-emitting unit is provided with a driving switch and sub-pixels, the control end of the driving switch is connected with the compensation capacitor arranged on the reset unit, the output end of the driving switch is connected with the first compensation unit, and one end of the reset unit is connected with a power supply voltage; the reset unit is used for resetting the control end of the driving switch and the compensation capacitor according to the power supply voltage; the first compensation unit is used for carrying out potential compensation on the compensation capacitor according to data voltage, and the second compensation unit is used for carrying out potential compensation on the compensation capacitor according to the driving potential of the sub-pixel; the compensation capacitor is used for conducting the driving switch after potential compensation is carried out; the light-emitting unit is used for driving the sub-pixels to emit light when the driving switch is switched on, the compensation capacitor is compensated through the first compensation unit according to data voltage, the compensation capacitor is compensated through the second compensation unit according to the sub-pixels, and then the driving switch is maintained in a conducting state through the compensation capacitor, so that current passing through the driving switch is only related to the data voltage, the stability of the current passing through the driving switch is improved, the current passing through the driving switch is not influenced by the power voltage and the threshold voltage of the driving switch, the display brightness fluctuation caused by the power voltage fluctuation or the threshold voltage drift of the driving switch is avoided, the problem of uneven display of the display panel is avoided, and the display effect is improved.
Example two
For better understanding of the present invention, the present embodiment provides a more specific example to illustrate the present invention.
The present embodiment provides a pixel driving circuit, which is composed of 6 switching TFT transistors (a first thin film transistor M1, a third thin film transistor M3-a seventh thin film transistor M7), 1 driving switch M2, 1 compensation capacitor C1, and a sub-pixel 4, where the sub-pixel 4 is an OLED, where M1, M3, M4, M5, M6, and M7 are N-type thin film transistors, and M2 is a driving switch for driving a light emitting device, and is also an N-type thin film transistor. The signal network consists of a Source Data Line, a constant voltage power Line outputting a power supply voltage VDD, a Ground Line, and 4 control signals SEL1[ n ], SEL2[ n ], SEL3[ n ], SEL4[ n ]. Wherein, M1, M2 and M5 jointly form a light-emitting unit 3, and M3, C1 and M7 jointly form a reset unit 1; m4 forms the first compensation cell 21, M6 forms the second compensation cell 22; the control ends of M1 and M6 are connected to SEL3, the control ends of M3 and M7 are connected to SEL4, and the control end of M4 is connected to SEL 1;
an input end of the first thin film transistor M1 is connected to a data voltage Vdata, an output end of the first thin film transistor M1 is connected to an input end of the driving switch M2, an input end of the fifth thin film transistor M5 is connected to an output end of the driving switch M2, and an output end of the fifth thin film transistor M5 is connected to the sub-pixel 4; the compensation capacitor C1 is arranged between the output end of the third thin film transistor M3 and the input end of the seventh thin film transistor M7, and the output end of the seventh thin film transistor M7 is connected with the ground Vss; an input end of the third thin film transistor M3 is connected to the first thin film transistor M1 through a D connection point on the light emitting unit 3, a G connection point is provided between an output end of the third thin film transistor M3 and the compensation capacitor C1, and a control end of the driving switch M2 is connected to the compensation capacitor C1 through the G connection point; an input terminal of a fourth thin film transistor M4 is connected to the data voltage, and an output terminal of the fourth thin film transistor M4 is connected to an output terminal of the driving switch M2; one end of the sixth thin film transistor M6 is connected to the point of connection S of the light emitting unit 3, and the other end of the sixth thin film transistor M6 is connected to the point of connection a of the reset unit 1; the S connection point is disposed between the sub-pixel 4 and the fifth thin film transistor M5, and the a connection point is disposed between the seventh thin film transistor M7 and the compensation capacitor C1.
In some examples, the pixel driving circuit uses a frame signal as a period, the timing of each signal in the period is shown in fig. 3, each period is divided into three stages, i.e., a reset stage T1, a compensation stage T2, and a light emitting stage T3, and SEL1[ n ] and SEL3[ n ] are inverse signals to each other, and SEL2[ n ] and SEL4[ n ] are inverse signals to each other, for example, at the same time, the first control signal SEL1 is a low-level signal, and the fourth control signal SEL4 is a high-level signal; the second control signal SEL2 is a low signal, and the third control signal SEL3 is a high signal. For another example, at the same time, the first control signal SEL1 is a high-level signal, and the fourth control signal SEL4 is a low-level signal; the second control signal SEL2 is a high signal, and the third control signal SEL3 is a low signal.
Wherein, T1 is an initialization stage, at this time, SEL3[ n ], SEL4[ n ] is at a high level, SEL1[ n ], SEL2[ n ] is at a low level, and the switches M1, M3, M6, M7 are in an on state, as shown in fig. 4, VDD charges the Gate of the driving switch M2 to VDD through M1 and M3, i.e. the control terminal voltage VG = VDD of the driving switch M2, so that the voltage of the compensation capacitor C1C1 is also VDD, this stage M5 is completely turned off, no current flows through the OLED, which can reduce power consumption and improve OLED aging;
the stage T2 is a compensation stage, when SEL1[ n ], SEL4[ n ] is at a high level and SEL2[ n ], SEL3[ n ] is at a low level, as shown in fig. 5, when M3, M4, M7 are turned on, when the data voltage Vdata is written to the source S of the driving switch M2 through M4, that is, the voltage of Vs = Vdata, the voltage at the point a is connected to Ground through M7, the driving switch M2 forms a diode connection through M3, the control point G of the driving switch M2 is released to VG = VTH + Vdata, and the voltage across the storage capacitor C1 is VC1= VTH + Vdata, and in this stage, since M5 is turned off, no current flows from the OLED, the power consumption can be reduced and the aging of the OLED can be improved.
The T3 stage is a light emitting stage, where SEL1[ n ], SEL4[ n ] is at a low level and SEL2[ n ], SEL3[ n ] is at a high level, as shown in fig. 6, M1, M5, M6 are turned on, the source voltage of the driving switch M2 is equal to the driving voltage of the OLED device, i.e. VS = VOLED, and the gate voltage VG = VC1+ volld = VTH + Vdata + volld, and the driving current flows through the OLED device to emit light at this stage, and the driving current can be expressed as:
I_OLED=1/2×μ×W/L×C_GI×（V_gs-V_th ）^2
=1/2×μ×W/L×C_GI×（V_G-V_S-V_th ）^2
=1/2×μ×W/L×C_GI×（V_TH+V_Data+V_VOLED-V_VOLED-V_TH ）^2
=1/2×μ×W/L×C_GI×（V_Data ）^2
from the expression: the IOLED is only related to the data voltage Vdata, that is, the pixel driving circuit provided by the embodiment reduces the influence of the threshold voltage of the driving switch and the voltage drop of the power voltage VDD on the driving current passing through the driving switch, enhances the display uniformity of the OLED, and simultaneously, the driving circuit realizes the complete shielding of the current in the non-light-emitting interval, thereby reducing the power consumption and improving the aging of the OLED.
EXAMPLE III
Based on the same concept, the present embodiment also provides a pixel driving method, as shown in fig. 7, applied to the pixel driving circuit according to any one of the above, the pixel driving method including:
s101, in a reset stage, resetting a control end of a driving switch and a compensation capacitor on a reset unit through the reset unit;
s102, in a compensation stage, performing potential compensation on the compensation capacitor through a first compensation unit, and performing potential compensation on the compensation capacitor through a second compensation unit after the compensation of the first compensation unit;
and S103, in a light emitting stage, conducting a light emitting unit through the compensation capacitor, and driving the sub-pixel to emit light through the light emitting unit.
In some examples of the present embodiment, the potential compensation of the compensation capacitance by the first compensation unit includes: the first compensation unit is turned on, and data voltage is transmitted to the output end of the driving switch, so as to perform potential compensation on the compensation capacitor connected with the control end of the driving switch, so that the voltage of the compensation capacitor is the data voltage plus the threshold voltage of the driving switch, specifically, one end of the first compensation unit is connected to the data voltage, and the other end of the first compensation unit is connected to the output end of the driving switch through the light-emitting unit; when the first compensation unit is conducted, the data voltage is transmitted to the output end of the driving switch, so that potential compensation is performed on the compensation capacitor connected with the control end of the driving switch. It can be understood that the control terminal voltage of the drive switch = the voltage at the output terminal of the drive switch (the output terminal is the output terminal) plus the threshold voltage; when the first compensation unit is conducted, the data voltage is transmitted to the output end of the driving switch, the voltage of the output end of the driving switch is the data voltage, the voltage of the control end of the driving switch is the data voltage + the threshold voltage, the control end of the driving switch is connected with the compensation capacitor through the reset unit, potential compensation is conducted on the compensation capacitor through the reset unit, and the voltage of the compensation capacitor is synchronized to the data voltage + the threshold voltage.
In some examples of the present embodiment, the potential compensation of the compensation capacitance by the second compensation unit includes: the driving potential of the sub-pixel is obtained, the driving potential of the sub-pixel is transmitted to a compensation capacitor through the second compensation unit, and the compensation capacitor is subjected to potential compensation. It should be understood that, during the light emitting period, the light emitting unit drives the sub-pixel, so that when the sub-pixel emits light, the second compensation unit is connected to the anode of the sub-pixel, the second compensation unit equalizes the driving voltage of the sub-pixel to the compensation capacitor, performs potential compensation on the compensation capacitor, and then compensates the voltage of the compensation capacitor to the data voltage + the threshold voltage + the driving voltage of the sub-pixel, so that the second compensation circuit can accurately obtain the driving voltage of the sub-pixel to compensate the compensation capacitor.
The pixel driving method provided by the embodiment comprises the following steps: in the resetting stage, resetting a control end of a driving switch and a compensation capacitor on a resetting unit through the resetting unit; in the compensation stage, the compensation capacitor is subjected to potential compensation through a first compensation unit, and after the compensation of the first compensation unit, the compensation capacitor is subjected to potential compensation through a second compensation unit; in the light-emitting stage, the light-emitting unit is conducted through the compensation capacitor, and the sub-pixels are driven to emit light through the light-emitting unit; the compensation capacitor is compensated through the first compensation unit according to the data voltage, the compensation capacitor is compensated through the second compensation unit according to the sub-pixels, the driving switch is maintained to be in a conducting state through the compensation capacitor, the current passing through the driving switch is only related to the data voltage, the stability of the current passing through the driving switch is improved, the current passing through the driving switch is not affected by the power supply voltage and the threshold voltage of the driving switch, the display brightness fluctuation caused by the fluctuation of the power supply voltage or the drift of the threshold voltage of the driving switch is avoided, the problem of uneven display of a display panel is avoided, and the display effect is improved.
Example four
Based on the same concept, the present embodiment provides a display panel, as shown in fig. 4, including: a substrate 5, a plurality of sub-pixels 4 arranged on the substrate, and a pixel driving circuit 6 as described in any one of the above, the pixel driving circuit 6 being connected to the sub-pixels 4 to drive the sub-pixels 4 to emit light.
In some examples, the sub-pixel 4 comprises: red 4, green 4 and blue 4 sub-pixels; or, the sub-pixels 4 comprise a red sub-pixel 4, a green sub-pixel 4, a blue sub-pixel 4 and a yellow sub-pixel 4; or, the sub-pixels 4 include a red sub-pixel 4, a green sub-pixel 4, a blue sub-pixel 4, and a white sub-pixel 4.
EXAMPLE five
As shown in fig. 5, an embodiment of the present application provides a display device, which includes a processor 111, a communication interface 112, a memory 113, and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 complete mutual communication through the communication bus 114,
a memory 113 for storing a computer program;
in an embodiment of the present application, the processor 111 is configured to implement the steps of the pixel driving method provided in any one of the foregoing method embodiments when executing the program stored in the memory 113.
Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the pixel driving method as provided in any of the foregoing method embodiments.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A pixel driving circuit, comprising: reset unit, compensation unit, luminescence unit, be provided with compensation capacitance on the reset unit, the compensation unit includes: the light-emitting unit is provided with a driving switch, the driving switch is connected with the sub-pixels, the control end of the driving switch is connected with the compensation capacitor arranged on the reset unit, the output end of the driving switch is connected with the first compensation unit, and one end of the reset unit is connected with power supply voltage;
the reset unit is used for resetting the control end of the driving switch and the compensation capacitor according to the power supply voltage;
the first compensation unit is used for carrying out potential compensation on the compensation capacitor according to data voltage, and the second compensation unit is used for carrying out potential compensation on the compensation capacitor according to the driving potential of the sub-pixel;
the compensation capacitor is used for conducting the driving switch after potential compensation is carried out;
the light-emitting unit is used for driving the sub-pixels to emit light when the driving switch is switched on.
2. The pixel driving circuit according to claim 1, wherein one end of the first compensation unit is connected to the data voltage, and the other end of the first compensation unit is connected to an output end of the driving switch;
when the first compensation unit is conducted, the data voltage is transmitted to the output end of the driving switch, so that potential compensation is performed on the compensation capacitor connected with the control end of the driving switch.
3. The pixel driving circuit according to claim 1, wherein one end of the second compensation unit is connected to the anode of the sub-pixel through the light emitting unit, and the other end of the second compensation unit is connected to the reset unit, and the second compensation unit is configured to perform potential compensation on the compensation capacitor according to a driving potential of the sub-pixel.
4. The pixel driving circuit according to any one of claims 1 to 3, wherein the light emitting unit further comprises: a first thin film transistor, a fifth thin film transistor; the input end of the first thin film transistor is connected with the data voltage, the output end of the first thin film transistor is connected with the input end of the driving switch, the input end of the fifth thin film transistor is connected with the output end of the driving switch, and the output end of the fifth thin film transistor is connected with the sub-pixel;
the reset unit includes: a third thin film transistor and a seventh thin film transistor; the compensation capacitor is arranged between the output end of the third thin film transistor and the input end of the seventh thin film transistor, and the output end of the seventh thin film transistor is connected with the ground; the input end of the third thin film transistor is connected with the first thin film transistor through a connection point D on the light-emitting unit, a connection point G is arranged between the output end of the third thin film transistor and the compensation capacitor, and the control end of the driving switch is connected with the compensation capacitor through the connection point G;
a fourth thin film transistor is arranged on the first compensation unit, the input end of the fourth thin film transistor is connected with the data voltage, and the output end of the fourth thin film transistor is connected with the output end of the driving switch;
a sixth thin film transistor is arranged on the second compensation unit, one end of the sixth thin film transistor is connected with the point of connection S on the light-emitting unit, and the other end of the sixth thin film transistor is connected with the point of connection A on the reset unit; the S connection point is disposed between the sub-pixel and the fifth thin film transistor, and the a connection point is disposed between the seventh thin film transistor and the compensation capacitor.
5. The pixel driving circuit according to claim 4, wherein a control terminal of the fourth thin film transistor is connected to a first control signal; the control end of the fifth thin film transistor is connected with a second control signal; the control ends of the first thin film transistor and the sixth thin film transistor are connected with a third control signal; and the control ends of the third thin film transistor and the seventh thin film transistor are connected with a seventh control signal.
6. The pixel driving circuit according to claim 5, wherein when the first to seventh thin film transistors and the driving switch are all thin film transistors of the same type, the second control signal and the fourth control signal are inversion signals, and the first control signal and the third control signal are inversion signals.
7. A pixel driving method applied to the pixel driving circuit according to any one of claims 1 to 6, the pixel driving method comprising:
in the resetting stage, resetting a control end of a driving switch and a compensation capacitor on a resetting unit through the resetting unit;
in the compensation stage, the compensation capacitor is subjected to potential compensation through a first compensation unit, and after the compensation of the first compensation unit, the compensation capacitor is subjected to potential compensation through a second compensation unit;
and in the light-emitting stage, the light-emitting unit is conducted through the compensation capacitor, and the sub-pixel is driven to emit light through the light-emitting unit.
8. The pixel driving method according to claim 7, wherein the potential compensation of the compensation capacitance by the first compensation unit includes:
and the first compensation unit is conducted, and the data voltage is transmitted to the output end of the driving switch so as to perform potential compensation on the compensation capacitor connected with the control end of the driving switch.
9. The pixel driving method according to claim 7, wherein the potential compensation of the compensation capacitance by the second compensation unit includes:
and acquiring the driving potential of the sub-pixel, transmitting the driving potential of the sub-pixel to a compensation capacitor through the second compensation unit, and performing potential compensation on the compensation capacitor.
10. A display panel, comprising: a substrate, a plurality of sub-pixels disposed on the substrate, and the pixel driving circuit according to any one of claims 1 to 6, the pixel driving circuit being connected to the sub-pixels to drive the sub-pixels to emit light.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130087128A (en) * | 2012-01-27 | 2013-08-06 | 삼성디스플레이 주식회사 | Pixel circuit, method of driving the same, and organic light emitting display device having the same |
| US20160275869A1 (en) * | 2015-03-20 | 2016-09-22 | Samsung Display Co., Ltd. | Pixel circuit and display apparatus including the pixel circuit |
| US20170110055A1 (en) * | 2015-04-27 | 2017-04-20 | Boe Technology Group Co., Ltd. | Pixel circuit, driving method thereof and related devices |
| CN108231005A (en) * | 2018-03-29 | 2018-06-29 | 武汉华星光电半导体显示技术有限公司 | AMOLED pixel-driving circuits, driving method, display panel and terminal |
| CN110033733A (en) * | 2019-04-19 | 2019-07-19 | 深圳市华星光电半导体显示技术有限公司 | OLED display panel and its driving method |
| CN112992049A (en) * | 2019-12-13 | 2021-06-18 | 乐金显示有限公司 | Electroluminescent display device with pixel driving circuit |
| CN113299230A (en) * | 2021-05-27 | 2021-08-24 | 昆山国显光电有限公司 | Pixel driving circuit, driving method of pixel driving circuit and display panel |
| CN114203115A (en) * | 2022-01-28 | 2022-03-18 | 绵阳惠科光电科技有限公司 | Driving voltage compensation circuit, driving circuit, pixel driving circuit and display device |
| CN114758612A (en) * | 2022-04-18 | 2022-07-15 | 深圳市华星光电半导体显示技术有限公司 | Pixel compensation circuit, display panel and pixel compensation method |
| CN114783378A (en) * | 2022-05-23 | 2022-07-22 | 惠科股份有限公司 | Pixel driving circuit, pixel driving method and display panel |
-
2022
- 2022-08-08 CN CN202210943670.1A patent/CN115019733B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130087128A (en) * | 2012-01-27 | 2013-08-06 | 삼성디스플레이 주식회사 | Pixel circuit, method of driving the same, and organic light emitting display device having the same |
| US20160275869A1 (en) * | 2015-03-20 | 2016-09-22 | Samsung Display Co., Ltd. | Pixel circuit and display apparatus including the pixel circuit |
| US20170110055A1 (en) * | 2015-04-27 | 2017-04-20 | Boe Technology Group Co., Ltd. | Pixel circuit, driving method thereof and related devices |
| CN108231005A (en) * | 2018-03-29 | 2018-06-29 | 武汉华星光电半导体显示技术有限公司 | AMOLED pixel-driving circuits, driving method, display panel and terminal |
| CN110033733A (en) * | 2019-04-19 | 2019-07-19 | 深圳市华星光电半导体显示技术有限公司 | OLED display panel and its driving method |
| CN112992049A (en) * | 2019-12-13 | 2021-06-18 | 乐金显示有限公司 | Electroluminescent display device with pixel driving circuit |
| CN113299230A (en) * | 2021-05-27 | 2021-08-24 | 昆山国显光电有限公司 | Pixel driving circuit, driving method of pixel driving circuit and display panel |
| CN114203115A (en) * | 2022-01-28 | 2022-03-18 | 绵阳惠科光电科技有限公司 | Driving voltage compensation circuit, driving circuit, pixel driving circuit and display device |
| CN114758612A (en) * | 2022-04-18 | 2022-07-15 | 深圳市华星光电半导体显示技术有限公司 | Pixel compensation circuit, display panel and pixel compensation method |
| CN114783378A (en) * | 2022-05-23 | 2022-07-22 | 惠科股份有限公司 | Pixel driving circuit, pixel driving method and display panel |
Non-Patent Citations (1)
| Title |
|---|
| 王俊生等: "OLED电视残影消除和寿命提升", 《液晶与显示》 * |
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