CN116543697A - Pixel driving circuit, display panel and display device - Google Patents
Pixel driving circuit, display panel and display device Download PDFInfo
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- CN116543697A CN116543697A CN202310487483.1A CN202310487483A CN116543697A CN 116543697 A CN116543697 A CN 116543697A CN 202310487483 A CN202310487483 A CN 202310487483A CN 116543697 A CN116543697 A CN 116543697A
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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]
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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
- G09G3/3233—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
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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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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- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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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)
Abstract
The application provides a pixel driving circuit, which comprises a driving unit, a compensation unit and a switch unit, wherein the driving unit is conducted before the compensation stage; in the compensation stage, the control end of the compensation unit and the control end of the switch unit receive the nth scanning signal through the nth scanning line, the compensation unit and the switch unit are both conducted to conduct the second end of the switch unit and the control end of the drive unit, the control end of the drive unit receives the data signal through the data line, the sum of the potential of the control end of the drive unit to the potential of the data signal and the threshold voltage of the drive unit is pulled down, the current flowing through the drive unit and the current flowing through the light-emitting element are not affected by the threshold voltage, the light-emitting brightness of the light-emitting element is not affected by the threshold voltage, and the compensation of the threshold voltage is achieved. The application also provides a display panel and a display device with the display panel.
Description
Technical Field
The present disclosure relates to the field of display technologies, and particularly to a pixel driving circuit, a display panel with the pixel driving circuit, and a display device with the display panel.
Background
Compared with a liquid crystal display (Liquid Crystal Display, LCD), an Organic Light-Emitting Diode (OLED) display device is widely used in the field of high-performance display because of its advantages of high contrast, ultra-thin, flexible, and fast response speed.
In practical application, the threshold voltage of the driving transistor of the OLED display device may drift, so that the current passing through the OLED light emitting element changes, and the light emitting brightness of the OLED light emitting element also changes, which results in uneven light emitting brightness and color shift of the OLED display device, and reduces the product taste and the viewing experience of users.
Therefore, how to solve the variation of the emission luminance of the OLED light emitting element due to the threshold voltage shift of the driving transistor is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the foregoing drawbacks of the prior art, an object of the present application is to provide a pixel driving circuit, a display panel having the pixel driving circuit, and a display device having the display panel, which are intended to solve the problem of the prior art that the light emission brightness of the OLED light emitting element changes due to the threshold voltage shift of the driving transistor.
In order to solve the above technical problem, the embodiment of the application provides a pixel driving circuit, the pixel driving circuit includes a driving unit, a compensating unit and a switching unit, a first end of the compensating unit is electrically connected with a first end of the driving unit, a second end of the compensating unit is electrically connected with a control end of the driving unit, a control end of the compensating unit is electrically connected with an nth scanning line, a second end of the driving unit is electrically connected with a light emitting element, a first end of the switching unit is electrically connected with a second end of the driving unit, a second end of the switching unit is electrically connected with a data line, and a control end of the switching unit is electrically connected with the nth scanning line, wherein n is a positive integer greater than 1. Before the compensation phase, the drive unit is turned on. In the compensation stage, the control end of the compensation unit and the control end of the switch unit both receive an nth scanning signal through the nth scanning line, and the compensation unit and the switch unit are both conducted so as to conduct the second end of the switch unit and the control end of the drive unit, and the control end of the drive unit receives a data signal through the data line so as to pull down the potential of the control end of the drive unit to the sum of the potential of the data signal and the threshold voltage of the drive unit.
In summary, the pixel driving circuit provided in the embodiment of the application includes a driving unit, a compensating unit, and a switching unit. Before the compensation phase, the drive unit is turned on. In the compensation stage, the second end of the switch unit is connected with the control end of the driving unit, the control end of the driving unit receives a data signal through the data line, and the sum of the potential of the control end of the driving unit and the threshold voltage of the driving unit is pulled down, so that the current flowing through the driving unit and the current flowing through the light-emitting element are not influenced by the threshold voltage, the light-emitting brightness of the light-emitting element is not influenced by the threshold voltage, and the compensation of the threshold voltage is realized.
In an exemplary embodiment, the pixel driving circuit further includes a control unit having a first end electrically connected to the first power source terminal, a second end electrically connected to the first end of the driving unit, and a control end electrically connected to the nth light emission control terminal. In the light emitting stage, the control end of the control unit receives an nth light emitting control signal through the nth light emitting control end to conduct the first power end with the light emitting element so as to drive the light emitting element to emit light.
In an exemplary embodiment, the duty ratio of the nth light emission control signal is 20% to 100%.
In an exemplary embodiment, the pixel driving circuit further includes a pull-up unit having a first end electrically connected to the second power supply terminal or the first reference power supply terminal, a second end electrically connected to the control terminal of the driving unit, and a control terminal electrically connected to the n-1 th scan line. In the potential pull-up stage, the control end of the pull-up unit receives an n-1 scanning signal through the n-1 scanning line to conduct the second power end with the control end of the driving unit so as to pull up the potential of the control end of the driving unit to conduct the driving unit.
In an exemplary embodiment, the pixel driving circuit further includes a potential maintaining unit, two ends of the potential maintaining unit are respectively electrically connected to the control end of the driving unit and the third power end, and the potential maintaining unit is used for maintaining the potential of the control end of the driving unit.
Based on the same inventive concept, the embodiment of the application also provides a display panel, which comprises a plurality of data lines and a plurality of pixel driving circuits, wherein the pixel driving circuits are electrically connected with the data driving circuits through the data lines so as to receive data signals provided by the data driving circuits.
In summary, the display panel provided in the embodiments of the present application includes a plurality of data lines and a plurality of pixel driving circuits, where the pixel driving circuits include a driving unit, a compensation unit and a switching unit. Before the compensation phase, the drive unit is turned on. In the compensation stage, the second end of the switch unit is connected with the control end of the driving unit, the control end of the driving unit receives a data signal through the data line, and the sum of the potential of the control end of the driving unit and the threshold voltage of the driving unit is pulled down, so that the current flowing through the driving unit and the current flowing through the light-emitting element are not influenced by the threshold voltage, the light-emitting brightness of the light-emitting element is not influenced by the threshold voltage, and the compensation of the threshold voltage is realized.
In an exemplary embodiment, the pixel driving circuit further includes a detection unit, a first end of the detection unit is electrically connected to the first end of the switch unit, a control end of the detection unit is electrically connected to an nth detection control end, and a second end of the detection unit is selectively electrically connected to the processing module of the display panel or to a second reference power end.
In an exemplary embodiment, the second end of the detection unit is electrically connected with the processing module of the display panel; in the compensation stage, the detection unit receives and conducts an nth detection signal through the nth detection control end, and the processing module receives the data signal through the second end of the detection unit and controls the data driving circuit to adjust the potential of the data signal of the next frame according to the potential of the data signal.
In an exemplary embodiment, a second end of the detection unit is electrically connected to the second reference power source end; in the compensation stage, the detection unit receives and conducts an nth detection signal through the nth detection control end, and the potential of the reference signal output by the second reference power end is loaded at the second end of the driving unit.
Based on the same inventive concept, the embodiment of the application also provides a display device, which comprises a scanning driving circuit, a data driving circuit and the display panel, wherein the display panel is respectively and electrically connected with the scanning driving circuit and the data driving circuit.
In summary, the display device provided in the embodiments of the present application includes a display panel, where the display panel includes a plurality of data lines and a plurality of pixel driving circuits, and the pixel driving circuits include a driving unit, a compensating unit and a switching unit. Before the compensation phase, the drive unit is turned on. In the compensation stage, the second end of the switch unit is connected with the control end of the driving unit, the control end of the driving unit receives a data signal through the data line, and the sum of the potential of the control end of the driving unit and the threshold voltage of the driving unit is pulled down, so that the current flowing through the driving unit and the current flowing through the light-emitting element are not influenced by the threshold voltage, the light-emitting brightness of the light-emitting element is not influenced by the threshold voltage, and the compensation of the threshold voltage is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
fig. 2 is a schematic layer structure of a display panel of the display device shown in fig. 1;
FIG. 3 is a schematic circuit diagram of the display panel shown in FIG. 1;
FIG. 4 is a schematic diagram of the pixel driving circuit shown in FIG. 3;
FIG. 5 is a timing diagram of different duty cycles of the light emission control signals according to the embodiment of the present disclosure;
FIG. 6 is a schematic diagram showing a second structure of the pixel driving circuit shown in FIG. 3;
FIG. 7 is a timing diagram of signals received by a pixel driving circuit according to an embodiment of the present disclosure;
fig. 8 is a schematic diagram of a second structure of the pixel driving circuit shown in fig. 3.
Reference numerals illustrate:
001-a first direction; 002-a second direction; 10-a substrate; 30-a circuit layer; 31-a pixel driving circuit;
50-a light emitting element; 60-packaging layers; 80-a processing module; 100-a display device; 110-a display panel; 110 a-a display area; 110 b-non-display area; 130-a scan driving circuit; 140-a data driving circuit; 160-a timing control circuit; 311-a drive unit; 312-a compensation unit; 313-a switching unit; 314-a control unit; 315-pull-up unit; 316-a potential maintaining unit; 318-a detection unit; n1-a first node; n2-a second node; t1-drive transistor; a T2-compensation transistor; a T3-switching transistor; t4-control transistor; a T5-pull-up transistor; t6-a detection transistor; c-capacitance; GL (1) -GL (i) -scan line; a DL-data line; PVDD 1-a first power supply terminal; PVDD 2-a second power supply terminal; PVDD 3-a third power supply terminal; a Sensor (n) -nth detection control terminal; EM (n) -nth light emission control terminal; ref 1-a first reference power supply terminal; ref 2-second reference power terminal.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Preferred embodiments of the present application are shown in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments that can be used to practice the present application. The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated. Directional terms referred to in this application, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are merely directions referring to the attached drawings, and thus, directional terms are used for better, more clear description and understanding of the present application, rather than indicating or implying that the apparatus or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context. It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the drawings are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprises," "comprising," "includes," "including," "may be" or "including" as used in this application mean the presence of the corresponding function, operation, element, etc. disclosed, but not limited to other one or more additional functions, operations, elements, etc. Furthermore, the terms "comprises" or "comprising" mean that there is a corresponding feature, number, step, operation, element, component, or combination thereof disclosed in the specification, and that there is no intention to exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof. It will also be understood that the meaning of "at least one" as described herein is one and more, such as one, two or three, etc., and the meaning of "a plurality" is at least two, such as two or three, etc., unless specifically defined otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a display device according to an embodiment of the disclosure. The display device 100 provided in the embodiment of the present application may include a display panel 110, a scan driving circuit 130, a data driving circuit 140, and a timing control circuit 160, where the display panel 110 is electrically connected to the scan driving circuit 130 and the data driving circuit 140, and the timing control circuit 160 is electrically connected to the scan driving circuit 130 and the data driving circuit 140.
Specifically, the scan driving circuit 130 is configured to output a scan signal to the display panel 110, and the data driving circuit 140 is configured to output a data signal to the display panel 110. The timing control circuit 160 is configured to output a timing control signal to the scan driving circuit 130 to control when the scan driving circuit 130 outputs the scan signal to the display panel 110, and the timing control circuit 160 is also configured to output a timing control signal to the data driving circuit 140 to control when the data driving circuit 140 outputs the data signal to the display panel 110.
In an embodiment of the present application, the display device 100 may be an Organic Light-Emitting Diode (OLED) display device. The timing control circuit 160 may be a timing controller (Timing Controller, TCON).
It is understood that the display device 100 may be used in electronic devices including, but not limited to, televisions, tablet computers, notebook computers, desktop computers, mobile phones, in-vehicle displays, smart watches, smart bracelets, smart glasses, and the like. According to the embodiment of the present application, the specific type of the display device 100 is not particularly limited, and a person skilled in the art can correspondingly design according to the specific use requirement of the application of the display device 100, which is not described herein.
In an exemplary embodiment, the display device 100 may further include other necessary components and constituent parts such as a power panel, a high-voltage board, and a key control board, which can be correspondingly supplemented by those skilled in the art according to the specific type and actual function of the display device 100, and will not be described herein.
In this embodiment of the present application, the display panel 110 may further include a display area 110a and a non-display area 110b disposed on a peripheral side or a part of a peripheral side of the display area 110 a. Wherein the display area 110a is used for displaying an image, and the non-display area 110b is used for controlling the display area 110a to display an image, with a corresponding driving circuit.
Referring to fig. 2, fig. 2 is a schematic layer structure of a display panel of the display device shown in fig. 1. The display panel 110 provided in this embodiment may at least include a substrate 10, a circuit layer 30, a plurality of light emitting elements 50 and a packaging layer 60, where the circuit layer 30 is disposed on one side of the substrate 10, a plurality of light emitting elements 50 are arranged in an array manner on one side of the circuit layer 30 opposite to the substrate 10, and the packaging layer 60 covers the plurality of light emitting elements 50 on the circuit layer 30. The circuit layer 30 is electrically connected to the light emitting elements 50 to drive the light emitting elements 50 to emit light, and the encapsulation layer 60 is used for protecting the light emitting elements 50.
In the embodiment of the application, referring to fig. 3, fig. 3 is a schematic circuit connection diagram of the display panel shown in fig. 1. The circuit layer 30 includes first to ith scan lines GL (1) to GL (i) and a plurality of data lines DL. The first scan lines GL1 to i-th scan lines GL (i) extend along a first direction 001, and are sequentially arranged in parallel at intervals along a second direction 002 and are insulated from each other, and the data lines DL extend along the second direction 002, are sequentially arranged in parallel at intervals along the first direction 001 and are insulated from each other. Wherein i is a positive integer greater than 1, and the first direction 001 is perpendicular to the second direction 002. The first to i-th scan lines GL (1) to GL (i) are electrically connected to the scan driving circuit 130, respectively, and the plurality of first data lines DL are electrically connected to the data driving circuit 140, respectively.
In an exemplary embodiment, the circuit layer 30 further includes a plurality of pixel driving circuits 31, and the plurality of pixel driving circuits 31 are arranged in an array, that is, the plurality of pixel driving circuits 31 are distributed in a plurality of rows and a plurality of columns. The pixel driving circuits 31 of one row are disposed between two adjacent scanning lines, and the pixel driving circuits 31 of one column are disposed between two adjacent data lines DL. Each of the pixel driving circuits 31 is electrically connected to two adjacent scanning lines and to one of the data lines DL. The scan signal output from the scan driving circuit 130 is transmitted to the pixel driving circuit 31 through the scan line, and the data signal output from the data driving circuit 140 is transmitted to the pixel driving circuit 31 through the data line DL.
In an exemplary embodiment, the pixel driving circuits 31 located in the same row are electrically connected to two adjacent scanning lines, and the pixel driving circuits 31 located in the same column are electrically connected to the same data line DL.
In an exemplary embodiment, the scan signal transmitted on the first scan line GL (1) is a first scan signal, the scan signal transmitted on the second scan line GL (2) is a second scan signal, … …, and the scan signal transmitted on the i-th scan line GL (i) is an i-th scan signal. Wherein the timing of different scan signals transmitted on different scan lines is different.
In the embodiment of the present application, please refer to fig. 4, fig. 4 is a schematic diagram of a first structure of the pixel driving circuit shown in fig. 3. The pixel driving circuit 31 is also electrically connected to the light emitting element 50 to drive the light emitting element 50 to emit light. The pixel driving circuit 31 includes a driving unit 311, a compensating unit 312, and a switching unit 313. The first end of the compensation unit 312 is electrically connected to the first end of the driving unit 311, the second end of the compensation unit 312 is electrically connected to the control end of the driving unit 311, the control end of the compensation unit 312 is electrically connected to the nth scanning line GL (n), the second end of the driving unit 311 is electrically connected to the anode of the light emitting element 50, and the cathode of the light emitting element 50 is electrically connected to the low voltage end PVEE. The first end of the switching unit 313 is electrically connected to the second end of the driving unit 311, the second end of the switching unit 313 is electrically connected to the data line DL, and the control end of the switching unit 313 is electrically connected to the nth scanning line GL (n). Wherein n is a positive integer greater than 1 and less than or equal to i.
Specifically, before the compensation phase, the driving unit 311 is turned on, i.e. the first end and the second end of the driving unit 311 are turned on. During the compensation phase, the control terminal of the compensation unit 312 receives the nth scanning signal through the nth scanning line GL (n) so that the compensation unit 312 is turned on, the control terminal of the switching unit 313 receives the nth scanning signal through the nth scanning line GL (n) so that the switching unit 313 is turned on, the second terminal of the switching unit 313 is turned on with the control terminal of the driving unit 311, and the control terminal of the driving unit 311 receives the data signal through the data line DL so as to pull down the sum of the potential Vdata of the control terminal of the driving unit 311 and the threshold voltage Vth of the driving unit 311.
It is understood that the potential of the control terminal of the driving unit 311 is greater than the sum of the potential Vdata of the data signal and the threshold voltage Vth of the driving unit 311 before the compensation phase. During the compensation phase, the control terminal of the driving unit 311 discharges to the switching unit 313 through the compensation unit 312 and the driving unit 311 until the potential of the control terminal of the driving unit 311 drops to the sum of the potential Vdata of the data signal and the threshold voltage Vth of the driving unit 311. After the compensation phase, the compensation unit 312 is turned off, the switching unit 313 is turned off, and the driving unit 311 operates in the saturation region. According to the current formula of the driving unit 311 in the saturation region: i=k (Vgs-Vth)/(2=k (Vdata-Vpvee-Voled)/(2), where Vpvee is the potential of the low voltage terminal PVEE, voled is the voltage between the anode and cathode of the light emitting element 50, k=1/2 μcoxw/L, μ is the effective carrier mobility, cox is the capacitance per unit area, W is the channel width of the driving unit, and L is the channel length of the driving unit. It can be seen that the current flowing through the driving unit 311 and the current flowing through the light emitting element 50 are not affected by the threshold voltage Vth, and thus the light emitting luminance of the light emitting element 50 is not affected by the threshold voltage Vth. Thus, compensation for the threshold voltage Vth is achieved.
In an exemplary embodiment, as shown in fig. 4, the driving unit 311 includes a driving transistor T1, a source of the driving transistor T1 may be a first terminal of the driving unit 311, a drain of the driving transistor T1 may be a second terminal of the driving unit 311, and a gate of the driving transistor T1 may be a control terminal of the driving unit 311. The driving transistor T1 may be an N-type MOS transistor. It can be understood that the electrical connection between the source, the drain and the gate of the driving transistor T1 is referred to above with respect to the electrical connection between the first terminal, the second terminal and the control terminal of the driving unit 311, which is not described herein.
In an exemplary embodiment, the compensation unit 312 includes a compensation transistor T2, a source of the compensation transistor T2 may be a first terminal of the compensation unit 312, a drain of the compensation transistor T2 may be a second terminal of the compensation unit 312, and a gate of the compensation transistor T2 may be a control terminal of the compensation unit 312. The compensation transistor T2 may be an N-type MOS transistor. It can be appreciated that the electrical connection between the source, the drain and the gate of the compensation transistor T2 is referred to above with respect to the electrical connection between the first terminal, the second terminal and the control terminal of the compensation unit 312, which is not described herein.
In an exemplary embodiment, the switching unit 313 includes a switching transistor T3, a source of the switching transistor T3 may be a first terminal of the switching unit 313, a drain of the switching transistor T3 may be a second terminal of the switching unit 313, and a gate of the switching transistor T3 may be a control terminal of the switching unit 313. The switching transistor T3 may be an N-type MOS transistor. It can be appreciated that the electrical connection between the source, the drain and the gate of the switching transistor T3 is referred to above with respect to the electrical connection between the first terminal, the second terminal and the control terminal of the switching unit 313, which is not described herein.
In summary, the pixel driving circuit 31 provided in the embodiment of the present application includes the driving unit 311, the compensating unit 312, and the switching unit 313. Before the compensation phase, the driving unit 311 is turned on, during the compensation phase, the control end of the compensation unit 312 receives the nth scanning signal through the nth scanning line GL (n) to turn on the compensation unit 312, the control end of the switching unit 313 receives the nth scanning signal through the nth scanning line GL (n) to turn on the switching unit 313 to turn on the second end of the switching unit 313 and the control end of the driving unit 311, the control end of the driving unit 311 receives the data signal through the data line DL to pull down the sum of the potential Vdata of the control end of the driving unit 311 and the threshold voltage Vth of the driving unit 311, so that the current flowing through the driving unit 311 and the current flowing through the light emitting element 50 are not affected by the threshold voltage Vth, and the light emitting brightness of the light emitting element 50 is not affected by the threshold voltage Vth, thereby realizing the compensation of the threshold voltage Vth.
With continued reference to fig. 4, in this embodiment, the pixel driving circuit 31 further includes a control unit 314, a first end of the control unit 314 is electrically connected to the first power source end PVDD1, a second end of the control unit 314 is electrically connected to the first end of the driving unit 311 and the first end of the compensation unit 312, and a control end of the control unit 314 is electrically connected to the nth light emitting control end EM (n). In the light emitting stage after the compensation stage, the control end of the control unit 314 receives the nth light emitting control signal through the nth light emitting control end EM (n) to conduct the first power end PVDD1 with the anode of the light emitting element 50, so as to drive the light emitting element 50 to emit light.
In an exemplary embodiment, the control unit 314 includes a control transistor T4, a source of the control transistor T4 may be a first terminal of the control unit 314, a drain of the control transistor T4 may be a second terminal of the control unit 314, and a drain of the control transistor T4 may be a control terminal of the control unit 314. The control transistor T4 may be an N-type MOS transistor. It can be appreciated that the electrical connection between the source, the drain and the gate of the control transistor T4 is referred to above with respect to the electrical connection between the first terminal, the second terminal and the control terminal of the control unit 314, which is not described herein.
In an exemplary embodiment, the duty ratio of the nth light emission control signal may be 20% to 100%, for example, 20%, 40%, 50%, 70%, 80%, 100%, or other values, which are not particularly limited herein.
Referring to fig. 5, fig. 5 is a timing diagram of different duty ratios of the light emission control signals according to the embodiment of the disclosure. It can be understood that by setting the duty ratio of the nth light emission control signal, the power-on time of the light emitting element 50 in one light emission period can be adjusted, so that the light emitting element 50 displays gray scales with different brightness. For example, when the duty ratio of the nth light emission control signal is 100%, the light emitting element 50 may realize maximum gray scale display; when the duty ratio of the nth light emission control signal is 20%, the light emitting element 50 can realize minimum gray scale display; when the duty ratio of the nth light emission control signal is 60%, the light emitting element can realize a medium gray scale display.
In the embodiment of the present application, referring to fig. 4, the pixel driving circuit 31 further includes a pull-up unit 315. The first end of the pull-up unit 315 is electrically connected to the second power source end PVDD2, the second end of the pull-up unit 315 is electrically connected to the control end of the driving unit 311 and the second end of the compensation unit 312, and the control end of the pull-up unit 315 is electrically connected to the n-1 scanning line GL (n-1).
In the potential pull-up stage before the compensation stage, the control terminal of the pull-up unit 315 receives the n-1 scanning signal via the n-1 scanning line GL (n-1) to conduct the second power source terminal PVDD2 with the control terminal of the driving unit 311, so as to pull up the potential of the control terminal of the driving unit 311 to conduct the driving unit 311.
In other embodiments, referring to fig. 6, fig. 6 is a schematic diagram of a second structure of the pixel driving circuit shown in fig. 3, where the pixel driving circuit of the second structure is different from the pixel driving circuit of the first structure in that: the first terminal of the pull-up unit 315 is not electrically connected to the second power source terminal PVDD2, but is electrically connected to the first reference power source terminal Ref 1. It can be appreciated that the voltage output by the first reference power supply terminal Ref1 is smaller than the voltage output by the second power supply terminal PVDD2, so as to avoid degradation of the driving unit 311 caused by excessive instantaneous current of the driving unit 311. For a description of the second structure of the pixel driving circuit that is the same as the first structure of the pixel driving circuit, please refer to the related description of the first structure of the pixel driving circuit, and the description is omitted herein.
In an exemplary embodiment, the pull-up unit 315 includes a pull-up transistor T5, a source of the pull-up transistor T5 may be a first terminal of the pull-up unit 315, a drain of the pull-up transistor T5 may be a second terminal of the pull-up unit 315, and a gate of the pull-up transistor T5 may be a control terminal of the pull-up unit 315. The pull-up transistor T5 may be an N-type MOS transistor. It can be appreciated that the electrical connection between the source, the drain and the gate of the pull-up transistor T5 is referred to as the electrical connection between the first terminal, the second terminal and the control terminal of the pull-up unit 315, which is not described herein.
In the embodiment of the present application, please refer to fig. 4 and fig. 7 together, fig. 7 is a signal timing diagram of one frame reception of the pixel driving circuit disclosed in the embodiment of the present application.
In the potential pull-up stage, the n-1 th scan signal is at a high level, the pull-up unit 315 is turned on, and the driving unit 311 is turned on; the nth scan signal is at a low level, the compensation unit 312 is turned off, and the switching unit 313 is turned off; the nth light emission control signal is at a low level, and the control unit 314 is turned off.
In the compensation phase, the n-1 th scan signal is low, and the pull-up unit 315 is turned off; the nth scanning signal is at a high level, the compensation unit 312 is turned on, the switching unit 313 is turned on, and the driving unit 311 is turned off when the control end of the driving unit 311 discharges until the potential is vdata+vth; the nth light emission control signal is at a low level, and the control unit 314 is turned off.
In the light emitting stage, the n-1 th scan signal is at a low level, and the pull-up unit 315 is turned off; the nth scanning signal is at a low level, the compensation unit 312 is turned off, the switching unit 313 is turned off, and the driving unit 311 is turned on; the nth light emission control signal is at a high level, the control unit 314 is turned on, and the light emitting element 50 emits light.
In an exemplary embodiment, as shown in fig. 4, the pixel driving circuit 31 further includes a first node N1 and a second node N2, the control terminal of the driving unit 311 and the second terminal of the compensating unit 312 are electrically connected to the first node N1, and the first terminal of the switching unit 313 and the second terminal of the driving unit 311 are electrically connected to the second node N2. In the potential pull-up stage, the potential of the first node N1 is Vvdd 2, and the potential of the second node N2 is Vvdd 2-Vth; in the compensation phase, the potential of the first node N1 is reduced from Vvdd 2 to Vdata+Vth, and the potential of the second node N2 is Vdata; in the light emitting stage, the potential of the first node N1 is vdata+vth, and the potential of the second node N2 is Voled. Wherein Vpvdd2 is the potential of the second power supply terminal PVDD 2.
In this embodiment, the pixel driving circuit 31 further includes a potential maintaining unit 316, two ends of the potential maintaining unit 316 are electrically connected to the control end of the driving unit 311 and the third power supply end PVDD3, respectively, and the potential maintaining unit 316 is configured to maintain the potential of the control end of the driving unit 311.
In an exemplary embodiment, the potential maintaining unit 316 includes a capacitor C, opposite ends of which are electrically connected to the control terminal of the driving unit 311 and the third power terminal PVDD3, respectively. Specifically, the first end of the capacitor C is electrically connected to the control end of the driving unit 311, the second end of the compensating unit 312, and the second end of the pull-up unit 315, and the second end of the capacitor C is electrically connected to the third power supply end PVDD 3.
In this embodiment, the pixel driving circuit 31 further includes a detecting unit 318, a first end of the detecting unit 318 is electrically connected to the first end of the switch unit 313, and a control end of the detecting unit 318 is electrically connected to an nth detection control end Sensor (n). In the compensation phase, the detecting unit 318 receives the nth detecting signal through the nth detecting control terminal Sensor (n) and is turned on to detect the potential of the data signal.
In this embodiment, as shown in fig. 4 and 6, the display panel 110 further includes a processing module 80, where the processing module 80 is electrically connected to the second end of the detecting unit 318 of each pixel driving circuit 31, and the processing module 80 receives the data signal through the second end of the detecting unit 318 and controls the data driving circuit 140 to adjust the potential of the data signal of the next frame according to the potential of the data signal, so that the currents passing through the driving units 311 are the same, and the currents driving the light emitting elements 50 to emit light are the same.
It will be appreciated that the routing paths of the data signals to each of the pixel driving circuits 31 are different, and the routing has a certain resistance value, so that the potentials of the data signals received by the pixel driving circuits 31 are different. The current of the light emitting element 50 in the present application is related to the potential of the data signal, and the difference in the potential of the data signal received by the pixel driving circuits 31 causes the current passing through the light emitting elements 50 to be different, and thus the light emitting brightness of the light emitting elements 50 to be different. Therefore, by detecting the potential of the data signal received by the pixel driving circuit 31, the potential of the data signal of the next frame is adjusted so that the currents for driving the light emitting elements 50 to emit light are the same. Also, by adjusting the potential of the data signal, the potential of the control terminal of the driving unit 311 may be changed, thereby compensating for the mobility of the driving unit 311.
In an exemplary embodiment, during the first frame, the second end of the detecting unit 318 is electrically connected to the processing module, and each of the pixel driving circuits 31 receives the nth detecting signal and is turned on to detect the potential of the data signal during the compensation phase of the first frame.
In an exemplary embodiment, referring to fig. 8, fig. 8 is a schematic diagram of a second structure of the pixel driving circuit shown in fig. 3, and a pixel driving circuit of a third structure is different from the pixel driving circuit of the first structure in that: the second terminal of the detecting unit 318 is not electrically connected to the processing module 80, but is electrically connected to the second reference power terminal Ref 2. That is, the second terminal of the detecting unit 318 is selectively electrically connected to the processing module 80 or the second reference power terminal Ref 2. After the first frame of picture, the second end of the detecting unit 318 is connected to the second reference power supply end Ref2, and in the compensation phase, the detecting unit 318 receives the nth detecting signal through the nth detecting control end Sensor (N) and is turned on, and the potential of the reference signal output by the second reference power supply end Ref2 is also loaded on the second node N2 (the second end of the driving unit 311), so that the potential of the control end of the driving unit 311 is the sum of the potential Vdata of the data signal, the threshold voltage Vth of the driving unit 311, and the potential of the reference signal, and compensates the threshold voltage Vth of the driving unit 311. For a description of the pixel driving circuit of the third structure that is the same as the pixel driving circuit of the first structure, please refer to the related description of the pixel driving circuit of the first structure, and the description is omitted herein.
It can be appreciated that the second terminal of the detecting unit 318 is selectively electrically connected to the processing module 80 or to the second reference power terminal, so that the detection of the potential of the data signal also compensates the threshold voltage Vth of the driving unit 311.
In an exemplary embodiment, referring to fig. 7, the timing of the nth detection signal may be the same as the timing of the nth scan signal.
In an exemplary embodiment, the detection unit 318 includes a detection transistor T6, a source of the detection transistor T6 may be a first terminal of the detection unit 318, a drain of the detection transistor T6 may be a second terminal of the detection unit 318, and a gate of the detection transistor T6 may be a control terminal of the detection unit 318. The detection transistor T6 may be an N-type MOS transistor. The processing module may be an integrated circuit (Integrated Circuit, IC), and it is understood that the electrical connection between the source, the drain and the gate of the detecting transistor T6 is referred to as the electrical connection between the first end, the second end and the control end of the detecting unit 318, which is not described herein.
In summary, the pixel driving circuit 31 provided in the embodiment of the present application includes the driving unit 311, the compensating unit 312, and the switching unit 313. Before the compensation phase, the driving unit 311 is turned on, during the compensation phase, the control end of the compensation unit 312 receives the nth scanning signal through the nth scanning line GLn, so that the compensation unit 312 is turned on, the control end of the switching unit 313 receives the nth scanning signal through the nth scanning line GLn, so that the switching unit 313 is turned on, the control end of the driving unit 311 receives the data signal through the data line DL, and the potential of the control end of the driving unit 311 is pulled down to be the sum of the potential Vdata of the data signal and the threshold voltage Vth of the driving unit 311, so that the current flowing through the driving unit 311 and the current flowing through the light emitting element 50 are not influenced by the threshold voltage Vth, and the light emitting brightness of the light emitting element 50 is not influenced by the threshold voltage Vth, thereby realizing the compensation of the threshold voltage Vth and improving the image quality of the display panel 110.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It is to be understood that the application of the present application is not limited to the examples described above, but that modifications and variations can be made by a person skilled in the art from the above description, all of which modifications and variations are intended to fall within the scope of the claims appended hereto. Those skilled in the art will recognize that the methods of accomplishing all or part of the above embodiments and equivalents thereof may be employed and still fall within the scope of the present application.
Claims (10)
1. A pixel driving circuit for driving a light emitting element to emit light, wherein the pixel driving circuit comprises a driving unit, a compensating unit and a switching unit, wherein a first end of the compensating unit is electrically connected with a first end of the driving unit, a second end of the compensating unit is electrically connected with a control end of the driving unit, a control end of the compensating unit is electrically connected with an nth scanning line, a second end of the driving unit is electrically connected with the light emitting element, a first end of the switching unit is electrically connected with a second end of the driving unit, a second end of the switching unit is electrically connected with a data line, and a control end of the switching unit is electrically connected with the nth scanning line, wherein n is a positive integer greater than 1;
before the compensation phase, the driving unit is conducted;
in the compensation stage, the control end of the compensation unit and the control end of the switch unit both receive an nth scanning signal through the nth scanning line, and the compensation unit and the switch unit are both conducted so as to conduct the second end of the switch unit and the control end of the drive unit, and the control end of the drive unit receives a data signal through the data line so as to pull down the potential of the control end of the drive unit to the sum of the potential of the data signal and the threshold voltage of the drive unit.
2. The pixel driving circuit according to claim 1, further comprising a control unit, a first end of the control unit being electrically connected to the first power supply end, a second end of the control unit being electrically connected to the first end of the driving unit, a control end of the control unit being electrically connected to the nth light emission control end;
in the light emitting stage, the control end of the control unit receives an nth light emitting control signal through the nth light emitting control end to conduct the first power end with the light emitting element so as to drive the light emitting element to emit light.
3. The pixel driving circuit according to claim 2, wherein the duty ratio of the nth light emission control signal is 20% to 100%.
4. The pixel driving circuit according to claim 2, further comprising a pull-up unit, a first end of the pull-up unit being electrically connected to the second power supply terminal or the first reference power supply terminal, a second end of the pull-up unit being electrically connected to the control terminal of the driving unit, a control terminal of the pull-up unit being electrically connected to the n-1 th scan line;
in the potential pull-up stage, the control end of the pull-up unit receives an n-1 scanning signal through the n-1 scanning line to conduct the second power end with the control end of the driving unit so as to pull up the potential of the control end of the driving unit to conduct the driving unit.
5. The pixel driving circuit according to any one of claims 1 to 4, further comprising a potential maintaining unit, wherein both ends of the potential maintaining unit are electrically connected to the control terminal of the driving unit and the third power terminal, respectively, and the potential maintaining unit is configured to maintain the potential of the control terminal of the driving unit.
6. A display panel comprising a plurality of data lines and a plurality of pixel driving circuits according to any one of claims 1 to 5, the pixel driving circuits being electrically connected to the data driving circuits via the data lines to receive data signals provided by the data driving circuits.
7. The display panel of claim 6, wherein the pixel driving circuit further comprises a detection unit, a first end of the detection unit is electrically connected to the first end of the switch unit, a control end of the detection unit is electrically connected to an nth detection control end, and a second end of the detection unit is selectively electrically connected to the processing module of the display panel or to a second reference power end.
8. The display panel of claim 7, wherein the second end of the detection unit is electrically connected with the processing module of the display panel;
in the compensation stage, the detection unit receives and conducts an nth detection signal through the nth detection control end, and the processing module receives the data signal through the second end of the detection unit and controls the data driving circuit to adjust the potential of the data signal of the next frame according to the potential of the data signal.
9. The display panel of claim 7, wherein a second end of the detection unit is electrically connected to the second reference power source end;
in the compensation stage, the detection unit receives and conducts an nth detection signal through the nth detection control end, and the potential of the reference signal output by the second reference power end is loaded at the second end of the driving unit.
10. A display device comprising a scan driving circuit, a data driving circuit, and a display panel according to any one of claims 6 to 9, the display panel being electrically connected to the scan driving circuit and the data driving circuit, respectively.
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