CN116246575B - Pixel driving circuit, display panel and display device - Google Patents
Pixel driving circuit, display panel and display device Download PDFInfo
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- CN116246575B CN116246575B CN202211663511.2A CN202211663511A CN116246575B CN 116246575 B CN116246575 B CN 116246575B CN 202211663511 A CN202211663511 A CN 202211663511A CN 116246575 B CN116246575 B CN 116246575B
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Classifications
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- 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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- 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
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- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
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Abstract
The application provides a pixel driving circuit, which comprises a driving unit, a brightness detecting unit and a compensating unit, wherein the driving unit is respectively and electrically connected with a first power end and an anode of a light emitting element, a cathode of the light emitting element is electrically connected with a grounding end, the compensating unit is respectively and electrically connected with the brightness detecting unit and a control end of the driving unit, the brightness detecting unit is used for detecting the light emitting brightness of the light emitting element to generate corresponding brightness signals, and the compensating unit outputs corresponding compensating signals to the control end of the driving unit according to the brightness signals to control the opening degree of the driving unit so that the light emitting brightness of the light emitting element is preset brightness. Therefore, the starting degree of the driving unit is adjusted to compensate the luminous brightness of the luminous element to the preset brightness, so that the phenomena of uneven luminous brightness and color deviation of the display device are avoided, and the product taste and the watching experience of a user are improved. The application also provides a display panel and a display device.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a pixel driving circuit, a display panel having the pixel driving circuit, and a display device having the display panel.
Background
Compared with a liquid crystal display device, an Organic Light-Emitting Diode (OLED) display device is widely applied to the technical field of display because of its advantages of high contrast ratio, self-luminescence, fast response speed, high brightness, good flexibility, no need of backlight source, and the like.
In practical application, due to the reasons of manufacturing process, design, materials and the like, the aging of the organic light emitting diode of the OLED display device and the drift of the threshold voltage of the driving transistor can all cause the change of the light emitting brightness of the organic light emitting diode, so that the uneven light emitting brightness and the color shift phenomenon of the OLED display device are caused, and the product taste and the viewing experience of users are reduced.
Therefore, how to solve the variation of the light emission luminance of the organic light emitting diode due to the aging of the organic light emitting diode and the threshold voltage shift of the driving transistor is a urgent 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-emitting brightness of the organic light-emitting diode changes due to the aging of the organic light-emitting diode and the threshold voltage drift of the driving transistor.
In order to solve the above-mentioned technical problems, an embodiment of the present application provides a pixel driving circuit, which includes a driving unit, a brightness detecting unit and a compensating unit. The driving unit is respectively and electrically connected with a first power end and an anode of the light-emitting element, a cathode of the light-emitting element is electrically connected with a grounding end, the compensation unit is respectively and electrically connected with the brightness detection unit and a control end of the driving unit, the brightness detection unit is used for detecting the light-emitting brightness of the light-emitting element to generate a corresponding brightness signal, and the compensation unit outputs the corresponding compensation signal to the control end of the driving unit according to the brightness signal to control the opening degree of the driving unit, so that the light-emitting brightness of the light-emitting element is preset brightness.
In summary, the pixel driving circuit provided in the embodiment of the application includes a driving unit, a brightness detecting unit and a compensating unit. The brightness detection unit is used for detecting the light-emitting brightness of the light-emitting element to generate a corresponding brightness signal, and the compensation unit outputs the corresponding compensation signal to the control end of the driving unit according to the brightness signal to control the opening degree of the driving unit, so that the light-emitting brightness of the light-emitting element is preset brightness. Therefore, by adjusting the opening degree of the driving unit to compensate the light-emitting brightness of the light-emitting element to the preset brightness, the phenomena of uneven light-emitting brightness and color deviation of the display device are avoided, and the product taste and the watching experience of a user are improved.
In an exemplary embodiment, the pixel driving circuit further includes a switching unit electrically connected to the scan line, the data line, and the control terminal of the driving unit, respectively, the switching unit receiving a scan signal through the scan line to turn on the data line and the control terminal of the driving unit, and the driving unit receiving a data signal through the data line to turn on the first power terminal and the light emitting element. The brightness detection unit is electrically connected with the scanning line, receives the scanning signal through the scanning line and detects the luminous brightness of the luminous element according to the scanning signal.
In an exemplary embodiment, the brightness detection unit includes a first control transistor, a photo resistor and a voltage dividing resistor, wherein a control end of the first control transistor is electrically connected to the scan line, a first end of the first control transistor is electrically connected to a second power end, a second end of the first control transistor is electrically connected to a first end of the photo resistor, a second end of the photo resistor is electrically connected to one end of the voltage dividing resistor and the compensation unit, and the other end of the voltage dividing resistor is electrically connected to the ground end, wherein the first control transistor is used for controlling the first end of the photo resistor to be electrically connected to the second power end, the photo resistor is used for changing a resistance value according to a brightness of the light emitting element, and the second end of the photo resistor outputs the brightness signal to the compensation unit.
In an exemplary embodiment, the brightness detection unit further includes a storage capacitor, one connection terminal of the storage capacitor is electrically connected to the scan line and the control terminal of the first control transistor, the other connection terminal of the storage capacitor is electrically connected to the first terminal of the first control transistor and the second power terminal, respectively, and the storage capacitor is used for storing the potential of the scan signal.
In an exemplary embodiment, the compensation unit includes a second control transistor, a control terminal of the second control transistor is electrically connected between the photoresistor and the voltage dividing resistor and connected to the brightness signal, a first terminal of the second control transistor is connected to a compensation voltage, a second terminal of the second control transistor is electrically connected to a control terminal of the driving unit, and the second control transistor is turned on according to the brightness signal and outputs the compensation voltage as the compensation signal to the control terminal of the driving unit to control the opening degree of the driving unit.
In an exemplary embodiment, the compensation unit further includes a voltage stabilizing capacitor, two connection terminals of the voltage stabilizing capacitor are respectively electrically connected to the control terminal of the second control transistor and the first terminal of the second control transistor, and the voltage stabilizing capacitor is used for stabilizing the potential of the control terminal of the second control transistor.
In an exemplary embodiment, the pixel driving circuit further includes a control unit electrically connected to the second terminal of the photoresistor and the first terminal of the second control transistor, respectively, and the control unit is connected to the brightness signal and outputs a corresponding compensation voltage to the first terminal of the second control transistor according to the brightness signal.
In an exemplary embodiment, the control unit includes a processing module and a storage module, the processing module is electrically connected to the second end of the photoresistor, the first end of the second control transistor, and the storage module, the processing module is configured to convert the brightness signals with different potentials into corresponding comparison values, the storage module is configured to store a plurality of standard values corresponding to a plurality of preset brightnesses, and store a compensation value determined by the standard values and the comparison values together, and the processing module outputs the corresponding compensation voltage to the first end of the second control transistor according to the compensation value.
Based on the same inventive concept, the embodiment of the application further provides a display panel, which comprises a plurality of scanning lines, a plurality of data lines and the pixel driving circuits, wherein the pixel driving circuits are respectively and electrically connected with the scanning lines and the data lines.
In summary, the display panel provided by the embodiment of the application includes a scan line, a plurality of data lines, and a pixel driving circuit, wherein the pixel driving circuit includes a driving unit, a brightness detecting unit, and a compensating unit. The brightness detection unit is used for detecting the light-emitting brightness of the light-emitting element to generate a corresponding brightness signal, and the compensation unit outputs the corresponding compensation signal to the control end of the driving unit according to the brightness signal to control the opening degree of the driving unit, so that the light-emitting brightness of the light-emitting element is preset brightness. Therefore, by adjusting the opening degree of the driving unit to compensate the light-emitting brightness of the light-emitting element to the preset brightness, the phenomena of uneven light-emitting brightness and color deviation of the display device are avoided, and the product taste and the watching experience of a user are improved.
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 by the embodiment of the application includes a scan driving circuit, a data driving circuit and a display panel, wherein the display panel includes a scan line, a plurality of data lines and a pixel driving circuit, and the pixel driving circuit includes a driving unit, a brightness detecting unit and a compensating unit. The brightness detection unit is used for detecting the light-emitting brightness of the light-emitting element to generate a corresponding brightness signal, and the compensation unit outputs the corresponding compensation signal to the control end of the driving unit according to the brightness signal to control the opening degree of the driving unit, so that the light-emitting brightness of the light-emitting element is preset brightness. Therefore, by adjusting the opening degree of the driving unit to compensate the light-emitting brightness of the light-emitting element to the preset brightness, the phenomena of uneven light-emitting brightness and color deviation of the display device are avoided, and the product taste and the watching experience of a user are improved.
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 application;
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 graph showing the characteristic curve of the resistance value versus the light-emitting brightness of the photoresistor shown in FIG. 4;
FIG. 6 is a graph showing the resistance of the photoresistor shown in FIG. 4 versus time;
FIG. 7 is a timing diagram of the operation of the scan driving circuit;
Fig. 8 is a schematic diagram of a control unit of a pixel driving circuit according to an embodiment of the present application.
Reference numerals illustrate:
001-a first direction; 002-a second direction; 1-a display device; 10-a display panel; 11-a substrate; 13-a circuit layer; 15-a light emitting element; 16-an encapsulation layer; 30-a scan driving circuit; 40-a data driving circuit; 50-a timing control circuit; 130-a pixel driving circuit; 131-a switching unit; 133-a drive unit; 135-a brightness detection unit; 135 a-a first control transistor; 135 b-photoresistor; 135 c-a voltage dividing resistor; 136-a compensation unit; 137-a potential maintaining unit; 136 a-a second control transistor; c1-capacitance; c2-storage capacitor; c3-a voltage stabilizing capacitor; m1-a switching transistor; m2-drive transistors; VDD 1-a first power supply terminal; VDD 2-a second power supply terminal; GND-ground; GL-scan lines; a DL-data line; 138-a control unit; 138 a-a processing module; 138 b-a memory module; vb-compensation voltage.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth 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 in which the application may be practiced. 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 term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. Directional terms, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., in the present application are merely referring to the directions of the attached drawings, and thus, directional terms are used for better, more clear explanation 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 above terms in the present application will be understood in specific cases by those of ordinary skill in the art. 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," or "having," when used in this specification, are intended to specify the presence of stated features, operations, elements, etc., but do not limit the presence of one or more other features, operations, elements, etc., but are not limited to other features, 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 application. The display device 1 provided in the embodiment of the present application may at least include a display panel 10, a scan driving circuit 30, a data driving circuit 40, and a timing control circuit 50, where the display panel 10 is electrically connected to the scan driving circuit 30 and the data driving circuit 40, and the timing control circuit 50 is electrically connected to the scan driving circuit 30 and the data driving circuit 40.
Specifically, the scan driving circuit 30 is configured to output a scan signal to the display panel 10, and the data driving circuit 40 is configured to output a data signal to the display panel 10. The timing control circuit 50 is configured to output a timing control signal to the scan driving circuit 30 to control when the scan driving circuit 30 outputs the scan signal to the display panel 10, and the timing control circuit 50 is also configured to output a timing control signal to the data driving circuit 40 to control when the data driving circuit 40 outputs the data signal to the display panel 10.
In an embodiment of the present application, the display device 1 may be an Organic Light-Emitting Diode (OLED) display device.
It will be appreciated that the display device 1 may be used in electronic devices including, but not limited to, tablet computers, notebook computers, desktop computers, and the like. According to the embodiment of the present invention, the specific type of the display device 1 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 1, which is not described herein.
In the exemplary embodiment, the display device 1 may further include other necessary components and constituent parts such as a power panel, a high-voltage board, and a key control board, and those skilled in the art may correspondingly supplement the components and constituent parts according to the specific type and actual function of the display device 1, which is not described herein.
In an embodiment of the present application, the display panel 10 may further include a non-display area and a display area. The display area is used for image display, the non-display area is at least partially arranged on the periphery of the display area in a surrounding mode and is not used for image display, and the non-display area is used for setting a corresponding driving circuit to control the display area to realize image display.
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 10 provided in the embodiment of the present application may at least include a substrate 11, a circuit layer 13, a plurality of light emitting elements 15, and a packaging layer 16, where the circuit layer 13 is disposed on one side of the substrate 11, the plurality of light emitting elements 15 are arranged in an array on a side of the circuit layer 13 opposite to the substrate 11, and the packaging layer 16 covers the plurality of light emitting elements 15 on the circuit layer 13. Wherein the circuit layer 13 is electrically connected to the light emitting elements 15 to drive the light emitting elements 15 to emit light, and the encapsulation layer 16 is used for protecting the light emitting elements 15.
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, and the circuit layer 13 includes a plurality of scan lines GL, a plurality of data lines DL and a plurality of pixel driving circuits 130. The plurality of scanning lines GL extend along a first direction 001 and are sequentially arranged at intervals in parallel along a second direction 002, and the plurality of data lines DL extend along the second direction 002 and are sequentially arranged at intervals in parallel along the first direction 001. The pixel driving circuit 130 is disposed between two adjacent scanning lines GL and two adjacent data lines DL. The pixel driving circuit 130 is electrically connected to the scanning line GL and the data line DL, respectively, the scanning line GL is further electrically connected to the scanning driving circuit 30, and the data line DL is further electrically connected to the data driving circuit 40. The scan signal output from the scan driving circuit 30 is transmitted to the pixel driving circuit 130 through the scan line GL, and the data signal output from the data driving circuit 40 is transmitted to the pixel driving circuit 130 through the data line DL.
It is understood that one of the scan lines GL intersects the plurality of data lines DL, and one of the data lines DL intersects the plurality of scan lines GL, i.e., the plurality of scan lines GL and the plurality of data lines DL are disposed in a grid shape. One of the pixel driving circuits 130 is electrically connected to one of the scanning lines GL and one of the data lines DL, respectively. Specifically, the pixel driving circuits 130 are disposed between any two adjacent scanning lines GL and any two adjacent data lines DL, the pixel driving circuits 130 located in the same column are all electrically connected to the same data line DL, and the pixel driving circuits 130 located in the same row are all electrically connected to the same scanning line GL. In the embodiment of the application, a plurality of the pixel driving circuits 130 are distributed in an array.
In an exemplary embodiment, the first direction 001 is perpendicular to the second direction 002, and the scan lines GL, the data lines DL, and the scan lines GL and the data lines DL are insulated from each other. That is, the plurality of scan lines GL are arranged at intervals and insulated from each other, the plurality of data lines DL are arranged at intervals and insulated from each other, and the plurality of scan lines GL and the plurality of data lines DL are insulated from each other.
In an embodiment of the present application, please refer to fig. 4, fig. 4 is a schematic diagram of a pixel driving circuit shown in fig. 3. The pixel driving circuit 130 includes a switching unit 131, a driving unit 133, a brightness detecting unit 135 and a compensating unit 136, wherein a control end of the switching unit 131 is electrically connected to the scanning line GL, a first end of the switching unit 131 is electrically connected to the data line DL, a second end of the switching unit 131 is electrically connected to the control end of the driving unit 133 and the compensating unit 136, a first end of the driving unit 133 is electrically connected to the first power end VDD1, a second end of the driving unit 133 is electrically connected to an anode of the light emitting element 15, and a cathode of the light emitting element 15 is electrically connected to the ground end GND. The brightness detection unit 135 is electrically connected to the compensation unit 136, and the compensation unit 136 is electrically connected to the brightness detection unit 135 and the control terminal of the driving unit 133, respectively. The brightness detection unit 135 is configured to detect the light-emitting brightness of the light-emitting element 15 to generate a corresponding brightness signal, and transmit the brightness signal to the compensation unit 136, where the compensation unit 136 outputs the corresponding compensation signal to the control end of the driving unit 133 according to the brightness signal, so as to control the opening degree of the driving unit 133, so that the light-emitting brightness of the light-emitting element 15 is a preset brightness.
It is understood that, since the threshold voltage of the driving unit 133 is unstable, that is, the driving unit 133 may be turned on differently under the control of the data signal of the same potential, the light emitting brightness of the light emitting element 15 may be changed. Meanwhile, as the use time increases, the light emitting element 15 gradually ages, resulting in a decrease in light emission luminance thereof. Therefore, when the light emitting brightness of the light emitting element 15 changes, the brightness detecting unit 135 may generate the brightness signals with different potentials, and the compensating unit 136 may correspondingly output the compensation signals with different potentials to the driving unit 133 according to the brightness signals with different potentials to control the on-state of the driving unit 133, so that the current of the light emitting element 15 changes, and further adjust the light emitting brightness of the light emitting element 15 to the preset brightness.
It will also be appreciated that the degree of opening of the driving unit 133, i.e. the degree of opening or the degree of conduction of the driving unit 133, i.e. the magnitude of the passing current can be controlled by adjusting the degree of opening of the driving unit 133, the greater the current through the light emitting element 15. The preset brightness of the light emitting element 15 is the target brightness of the light emitting element 15.
As shown in fig. 4, in an exemplary embodiment, the switching unit 131 includes a switching transistor M1, a source of the switching transistor M1 may be a first terminal of the switching unit 131, a drain of the switching transistor M1 may be a second terminal of the switching unit 131, and a gate of the switching transistor M1 may be a control terminal of the switching unit 131. The driving unit 133 includes a driving transistor M2, a source of the driving transistor M2 may be a first terminal of the driving unit 133, a drain of the driving transistor M2 may be a second terminal of the driving unit 133, and a gate of the driving transistor M2 may be a control terminal of the driving unit 133. Specifically, the gate of the switching transistor M1 is electrically connected to the scanning line GL, the source of the switching transistor M1 is electrically connected to the data line DL, the drain of the switching transistor M1 is electrically connected to the gate of the driving transistor M2 and the compensation unit 136, the source of the driving transistor M2 is electrically connected to the first power supply terminal VDD1, and the drain of the driving transistor M2 is electrically connected to the anode of the light emitting element 15.
In the embodiment of the present application, the pixel driving circuit 130 further includes a potential maintaining unit 137, wherein two connection terminals of the potential maintaining unit 137 are electrically connected to the control terminal of the driving unit 133 and the second terminal of the driving unit 133, that is, two connection terminals of the potential maintaining unit 137 are electrically connected to the gate and the drain of the driving transistor M2, respectively. When the switching unit 131 is turned off, the potential maintaining unit 137 is configured to maintain the potential of the control terminal of the driving unit 133, so that the driving unit 133 is turned on.
In an exemplary embodiment, the potential maintaining unit 137 includes a capacitor C1.
In an exemplary embodiment, the switching unit 131 receives the scan signal through the scan line GL to turn on the data line DL and the control terminal of the driving unit 133, and the driving unit 133 receives the data signal through the data line DL to turn on the first power terminal VDD1 and the light emitting element 15. Meanwhile, the potential of the data line signal is also loaded on the capacitor C1, when the scan signal is stopped, the switch unit 131 is turned off, that is, the control end of the driving unit 133 is not electrically connected to the data line DL, and the capacitor C1 discharges to turn on the driving unit 133, that is, the first power end VDD1 is turned on with the light emitting element 15.
In summary, the pixel driving circuit 130 according to the embodiment of the application includes a switching unit 131, a driving unit 133, a brightness detecting unit 135 and a compensating unit 136. The switching unit 131 is electrically connected to the scan line GL, the data line DL, and the control terminal of the driving unit 133, the driving unit 133 is further electrically connected to the light emitting element 15, and the compensating unit 136 is electrically connected to the brightness detecting unit 135 and the control terminal of the driving unit 133. The brightness detection unit 135 is configured to detect the light-emitting brightness of the light-emitting element 15 to generate a brightness signal, and the compensation unit 136 outputs a corresponding compensation signal to the control end of the driving unit 133 according to the brightness signal, so as to control the on-degree of the driving unit 133, so that the light-emitting brightness of the light-emitting element 15 is a preset brightness. Therefore, by adjusting the on-state of the driving unit 133 to compensate the light-emitting brightness of the light-emitting element 15 to the preset brightness, that is, to reach the target brightness of the light-emitting element 15, the display device 1 is prevented from having uneven light-emitting brightness and color shift, and the product taste and the viewing experience of the user are improved.
In the embodiment of the present application, the brightness detection unit 135 is electrically connected to the scan line GL, and the scan signal transmitted by the scan line GL is used to drive the brightness detection unit 135 to detect the light-emitting brightness of the light-emitting element 15, that is, the brightness detection unit 135 receives the scan signal through the scan line GL and detects the light-emitting brightness of the light-emitting element 15 according to the scan signal.
It can be understood that the scan signal may drive the brightness detection unit 135 to detect the light emitting brightness of the light emitting element 15 while the switch transistor M1 is turned on, so that the brightness detection unit 135 is prevented from being driven by a corresponding circuit alone, thereby simplifying the circuit structure of the display panel 10 and saving the cost. Meanwhile, the operation of the brightness detection unit 135 is limited only when the scanning signal arrives, and the time of the arrival of the scanning signal is relatively short, and the potential is relatively low, which is beneficial to prolonging the service life of the brightness detection unit 135, so that the brightness detection unit 135 obtains better stability, and the output brightness signal is more accurate.
As shown in fig. 4, in the embodiment of the application, the brightness detection unit 135 includes a first control transistor 135a, a photo resistor 135b and a voltage dividing resistor 135c, wherein a control end of the first control transistor 135a is electrically connected to the scan line GL, a first end of the first control transistor 135a is electrically connected to a second power supply end VDD2, a second end of the first control transistor 135a is electrically connected to a first end of the photo resistor 135b, a second end of the photo resistor 135b is electrically connected to one end of the voltage dividing resistor 135c and the compensation unit 136, and another end of the voltage dividing resistor 135c is electrically connected to the ground end GND. The first control transistor 135a is configured to control the first terminal of the photo resistor 135b to be turned on with the second power terminal VDD2, the photo resistor 135b is configured to change a resistance value according to the light emitting brightness of the light emitting element 15, and the second terminal of the photo resistor 135b outputs the brightness signal to the compensation unit 136.
In an exemplary embodiment, referring to fig. 5, fig. 5 is a schematic diagram of a characteristic curve of resistance versus light-emitting brightness of the photoresistor shown in fig. 4. As the light emission luminance of the light emitting element 15 increases, the resistance value of the photo resistor 135b decreases, and the potential of the luminance signal increases, thereby driving the compensation unit 136 to output the compensation signal.
In an exemplary embodiment, the resistance of the photoresistor 135b may be calculated by the following formula (1):
r1= (VDD 2-Vsd-Vs)/(Vs/R2) equation (1)
Wherein R1 is the resistance of the photoresistor 135 b; vsd is the voltage between the source and drain of the first control transistor 135 a; r2 is the resistance of the voltage dividing resistor 135c, vs is the voltage difference between the potential of the brightness signal and the ground GND, i.e. the voltage across the voltage dividing resistor 135 c.
In an exemplary embodiment, the current of the photoresistor 135b may be calculated by the following equation (2):
i=k×u×a×l×b formula (2)
Wherein I is the current of the photoresistor 135 b; u is the voltage applied across the photoresistor 135 b; l is the illuminance on the photo resistor 135 b; k is a proportionality coefficient; a is a voltage index, typically approximately 1; b is the illumination index.
In an exemplary embodiment, referring to fig. 6, fig. 6 is a schematic diagram of resistance versus time of the photoresistor shown in fig. 4. Wherein, the time from 0 to t3 and the time from t3 to t6 are respectively a frame frequency, the time from 0 to t1 is equal to the time from t3 to t4, the time from t1 to t2 is equal to the time from t4 to t5, and the time from t2 to t3 is equal to the time from t5 to t 6. When the light-emitting brightness of the light-emitting element 15 is consistent with the preset brightness from time 0 to time t3, the resistance change curve of the photoresistor 135 b; when the light-emitting brightness of the light-emitting element 15 is inconsistent with the preset brightness from time t3 to time t6, the resistance change curve of the photoresistor 135b is obtained. As can be seen from fig. 6, the resistance of the photo resistor 135b corresponding to the time t4 is greater than the resistance of the photo resistor 135b corresponding to the time t1, so that the light-emitting brightness of the light-emitting element 15 corresponding to the time t4 is less than the light-emitting brightness (i.e., the preset brightness) of the light-emitting element 15 corresponding to the time t1. At time t4 to time t5, the compensation signal output by the compensation unit 136 increases the on-level of the driving unit 133 to increase the light-emitting brightness of the light-emitting element 15, so that the light-emitting brightness of the light-emitting element 15 tends to the preset brightness. Thus, the resistance of the photo resistor 135b corresponding to the time t5 is the same as the resistance of the photo resistor 135b corresponding to the time t2, that is, the light-emitting brightness of the light-emitting element 15 corresponding to the time t5 is identical to the light-emitting brightness of the light-emitting element 15 corresponding to the time t 2.
In an exemplary embodiment, the control terminal of the first control transistor 135a is a gate, the first terminal of the first control transistor 135a is a source, and the second terminal of the first control transistor 135a is a drain.
As shown in fig. 4, in the embodiment of the application, the brightness detection unit 135 further includes a storage capacitor C2, one connection terminal of the storage capacitor C2 is electrically connected to the scan line GL and the control terminal of the first control transistor 135a, the other connection terminal of the storage capacitor C2 is electrically connected to the first terminal of the first control transistor 135a and the second power terminal VDD2, and the storage capacitor C2 is used for storing the potential of the scan signal.
It is understood that the storage capacitor C2 may continue to turn on the first control transistor 135a when the scan signal is stopped.
Referring to fig. 7, fig. 7 is a timing diagram illustrating the operation of the scan driving circuit. Wherein, the scan driving circuit 30 outputs the scan signal at time 0 to t2 and time t3 to t5, and the scan driving circuit 30 stops outputting the scan signal at time t2 to t3 and time t5 to t 6. At the time points 0 to t2 and t3 to t5, the luminance detecting unit 135 detects the light emission luminance of the light emitting element 15 and generates the luminance signal; at times t2 to t3 and at times t5 to t6, the first control transistor 135a is gradually turned off due to the continuous discharge of the storage capacitor C2, and the light emitting brightness of the light emitting element 15 is no longer detected.
As shown in fig. 4, in the embodiment of the present application, the compensation unit 136 includes a second control transistor 136a, and a control terminal of the second control transistor 136a is connected to the second terminal of the photo resistor 135b, that is, a control terminal of the second control transistor 136a is electrically connected between the photo resistor 135b and the voltage dividing resistor 135 c. The first terminal of the second control transistor 136a is connected to a compensation voltage Vb, the second terminal of the second control transistor 136a is electrically connected to the control terminal of the driving unit 133, and the compensation voltage Vb is output as the compensation signal to the control terminal of the driving unit 133 to control the opening degree of the driving unit 133.
In an exemplary embodiment, the control terminal of the second control transistor 136a is a gate, the first terminal of the second control transistor 136a is a source, and the second terminal of the second control transistor 136a is a drain.
In the embodiment of the present application, the compensation unit 136 further includes a stabilizing capacitor C3, where two connection terminals of the stabilizing capacitor C3 are electrically connected to the control terminal of the second control transistor 136a and the first terminal of the second control transistor 136a, respectively, and the stabilizing capacitor C3 is used to store the potential of the luminance signal so as to stabilize the potential of the control terminal of the second control transistor 136 a.
In the embodiment of the present application, referring to fig. 8, fig. 8 is a schematic diagram of a control unit of the pixel driving circuit disclosed in the embodiment of the present application, the pixel driving circuit 130 further includes a control unit 138, the control unit 138 is electrically connected to the second end of the photo resistor 135b and the first end of the second control transistor 136a, respectively, and the brightness signal controls the control unit 138 to output the corresponding compensation voltage Vb to the first end of the second control transistor 136 a.
In an embodiment of the present application, the control unit 138 includes a processing module 138a and a storage module 138b, where the processing module 138a is electrically connected to the second end of the photo resistor 135b, the first end of the second control transistor 136a, and the storage module 138b, respectively, the processing module 138a is configured to convert the brightness signals with different potentials into corresponding comparison values, and the storage module 138b is configured to store a plurality of standard values corresponding to a plurality of preset brightnesses one to one, and store compensation values determined by the standard values and the comparison values together, and the processing module 138a outputs the corresponding compensation voltage Vb to the first end of the second control transistor 136a according to the compensation values.
Specifically, referring to table 1, table 1 is a compensation voltage corresponding to brightness signals with different potentials. When the potential of the luminance signal is N2 (V), the corresponding comparison value is N21, when the preset luminance is M2 (lx), the corresponding standard value is M21, N21 and M21 together correspond to the compensation value P2, and the processing module 138a outputs the compensation voltage Vb with the potential P21 (V) to the first end of the second control transistor 136a according to the compensation value P2.
TABLE 1 Compensation voltages corresponding to luminance signals at different potentials
As can be appreciated, referring to fig. 4 and 8, the scan signal controls the first control transistor 135a to be turned on, and the voltage of the second power terminal VDD2 is transmitted to the photo resistor 135b through the first control transistor 135 a. Since the resistance of the photo resistor 135b is changed under different illumination intensities, the voltage across the photo resistor 135b is changed, i.e. the potential at the end of the photo resistor 135b connected to the voltage dividing resistor 135c is changed. The potential at the end of the photo resistor 135b connected to the voltage dividing resistor 135c is transmitted as the brightness signal to the control end of the second control transistor 136a and to the control unit 138, the brightness signal controls the second control transistor 136a to be turned on, the control unit 138 outputs the compensation voltage Vb of the corresponding potential to the first end of the second control transistor 136a according to the brightness signal, and the compensation voltage Vb is output as the compensation signal from the second end of the second control transistor 136a to the control end of the driving unit 133, so as to control the on-state of the driving unit 133, and further control the light-emitting brightness of the light-emitting element 15, that is, supplement the light-emitting brightness of the light-emitting element 15 until reaching the target brightness thereof.
In summary, the pixel driving circuit 130 according to the embodiment of the application includes a switching unit 131, a driving unit 133, a brightness detecting unit 135 and a compensating unit 136. The switching unit 131 is electrically connected to the scan line GL, the data line DL, and the control terminal of the driving unit 133, the driving unit 133 is further electrically connected to the light emitting element 15, and the compensating unit 136 is electrically connected to the brightness detecting unit 135 and the control terminal of the driving unit 133. The brightness detection unit 135 is configured to detect the light-emitting brightness of the light-emitting element 15 to generate a brightness signal, and the brightness signal controls the compensation unit 136 to output a corresponding compensation signal to the control end of the driving unit 133, so as to control the on-degree of the driving unit 133, so that the light-emitting brightness of the light-emitting element 15 is a preset brightness. Therefore, by adjusting the on-state of the driving unit 133 to compensate the light-emitting brightness of the light-emitting element 15 to the preset brightness, that is, to reach the target brightness of the light-emitting element 15, the display device 1 is prevented from having uneven light-emitting brightness and color shift, and the product taste and the viewing experience of the user are improved.
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 is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims. Those skilled in the art will recognize that the application can be practiced with modification in all or part of the methods described in the foregoing embodiments and with the equivalent modifications of the claims.
Claims (7)
1. The pixel driving circuit comprises a driving unit, wherein the driving unit is respectively and electrically connected with a first power supply end and an anode of a light emitting element, and a cathode of the light emitting element is electrically connected with a grounding end; the compensation unit comprises a second control transistor, the control end of the second control transistor is electrically connected with the second end of the photoresistor, the first end of the second control transistor is connected with compensation voltage, and the second end of the second control transistor is electrically connected with the control end of the driving unit;
The pixel driving circuit further comprises a control unit, the control unit is respectively and electrically connected with the second end of the photoresistor and the first end of the second control transistor, the brightness signal is transmitted to the control end of the second control transistor and the control unit so as to control the second control transistor to be conducted, the control unit outputs compensation voltage of corresponding potential to the first end of the second control transistor according to the brightness signal, and the compensation voltage is output to the control end of the driving unit from the second end of the second control transistor as the compensation signal so as to control the opening degree of the driving unit, so that the luminous brightness of the luminous element is preset brightness.
2. The pixel driving circuit according to claim 1, further comprising a switching unit electrically connected to the scan line, the data line, and the control terminal of the driving unit, respectively, the switching unit receiving a scan signal through the scan line to turn on the data line and the control terminal of the driving unit, the driving unit receiving a data signal through the data line to turn on the first power terminal and the light emitting element;
The brightness detection unit is electrically connected with the scanning line, receives the scanning signal through the scanning line and detects the luminous brightness of the luminous element according to the scanning signal.
3. The pixel driving circuit according to claim 2, wherein the brightness detecting unit further comprises a storage capacitor, one connection terminal of the storage capacitor is electrically connected to the scan line and the control terminal of the first control transistor, the other connection terminal of the storage capacitor is electrically connected to the first terminal of the first control transistor and the second power terminal, respectively, and the storage capacitor is used for storing the potential of the scan signal.
4. The pixel driving circuit according to claim 1, wherein the compensation unit further comprises a voltage stabilizing capacitor, two connection terminals of the voltage stabilizing capacitor are electrically connected to the control terminal of the second control transistor and the first terminal of the second control transistor, respectively, and the voltage stabilizing capacitor is used for stabilizing the potential of the control terminal of the second control transistor.
5. A pixel driving circuit according to any one of claims 1-4, wherein the control unit comprises a processing module and a memory module, the processing module being electrically connected to the second terminal of the photo resistor, the first terminal of the second control transistor and the memory module, respectively, the processing module being configured to convert the luminance signals of different potentials into corresponding comparison values, the memory module being configured to store a plurality of standard values corresponding to a plurality of the preset luminances, and to store a compensation value determined by the standard values and the comparison values together, the processing module outputting the corresponding compensation voltage to the first terminal of the second control transistor according to the compensation value.
6. A display panel comprising a plurality of scan lines and a plurality of data lines, wherein the display panel further comprises a plurality of pixel driving circuits according to any one of claims 1 to 5, the plurality of pixel driving circuits being electrically connected to the plurality of scan lines and the plurality of data lines, respectively.
7. A display device comprising a scan driving circuit, a data driving circuit, and the display panel according to claim 6, wherein the display panel is electrically connected to the scan driving circuit and the data driving circuit, respectively.
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