CN115938302B - Pixel driving circuit, display panel and display device - Google Patents
Pixel driving circuit, display panel and display device Download PDFInfo
- Publication number
- CN115938302B CN115938302B CN202211662816.1A CN202211662816A CN115938302B CN 115938302 B CN115938302 B CN 115938302B CN 202211662816 A CN202211662816 A CN 202211662816A CN 115938302 B CN115938302 B CN 115938302B
- Authority
- CN
- China
- Prior art keywords
- unit
- control
- electrically connected
- terminal
- emitting element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 7
- 230000002035 prolonged effect Effects 0.000 abstract description 9
- 230000032683 aging Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 16
- 230000008859 change Effects 0.000 description 8
- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 7
- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 7
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The application provides a pixel driving circuit which comprises a driving unit, a current limiting unit and a conduction control unit, wherein a first end of the driving unit is electrically connected with a first power end, a first end of the current limiting unit and the conduction control unit are respectively electrically connected with a second end of the driving unit, the second end of the current limiting unit is also electrically connected with the conduction control unit, the conduction control unit is also electrically connected with an anode of a light emitting element, and a cathode of the light emitting element is electrically connected with a grounding end. The conduction control unit is used for conducting the driving unit, the current limiting unit and the light emitting element, or conducting the driving unit and the light emitting element. When the driving unit and the current limiting unit are conducted with the light-emitting element through the conduction control unit, the current limiting unit is used for inhibiting the surge current of the light-emitting element, so that the aging of the light-emitting element caused by the surge current is avoided, and the service life of the light-emitting element is prolonged. 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
With the development and progress of display technology, compared with a liquid crystal display (Liquid Crystal Display, LCD), an Organic Light-Emitting Diode (OLED) display device has the advantages of no backlight source, high contrast ratio, fast response speed, high brightness, light weight, wide applicable temperature range, simple structure and process, and the like, so that the OLED display device is widely applied to the technical field of display.
At the moment of lighting the organic light emitting diode of the OLED display device, the current of the organic light emitting diode is generally rapidly increased in an extremely short time, so that the organic light emitting diode generates a large surge current. The resulting surge current can exacerbate the aging of the organic light emitting diode, thereby reducing the useful life of the organic light emitting diode.
Therefore, how to solve the problem of generating the surge current when the organic light emitting diode is turned on is a urgent need for 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 surge current generated when an organic light emitting diode is turned on in the prior art.
In order to solve the above technical problems, an embodiment of the present application provides a pixel driving circuit, which includes a driving unit, a current limiting unit, and a conduction control unit, wherein a first end of the driving unit is electrically connected to a first power end, a first end of the current limiting unit and the conduction control unit are respectively electrically connected to a second end of the driving unit, a second end of the current limiting unit is further electrically connected to the conduction control unit, the conduction control unit is further electrically connected to an anode of a light emitting element, and a cathode of the light emitting element is electrically connected to a ground end. The conduction control unit is used for conducting the driving unit, the current limiting unit and the light emitting element, or conducting the driving unit and the light emitting element. When the driving unit and the current limiting unit are conducted with the light emitting element through the conduction control unit, the current limiting unit is used for inhibiting surge current of the light emitting element.
In summary, the pixel driving circuit provided by the embodiment of the application includes a driving unit, a current limiting unit, and a conduction control unit, where the conduction control unit is configured to conduct the driving unit, the current limiting unit, and the light emitting element, or is configured to conduct the driving unit and the light emitting element. When the driving unit and the current limiting unit are conducted with the light-emitting element through the conduction control unit, the current limiting unit is used for inhibiting surge current of the light-emitting element, so that aging of the light-emitting element caused by the surge current is avoided, and the service life of the light-emitting element is prolonged. After the current of the light-emitting element is stable for a certain time, the conduction control unit directly conducts the driving unit with the light-emitting element, so that the insertion loss of the current limiting unit is avoided, and meanwhile, the current limiting unit can be prevented from operating for a long time, and the life cycle of the current limiting unit is further prolonged.
In an exemplary embodiment, the pixel driving circuit further includes a switching unit, a control terminal of the switching unit is electrically connected to the scan line, a first terminal of the switching unit is electrically connected to the data line, a second terminal of the switching unit is electrically connected to the control terminal of the driving unit, the switching unit receives a scan signal through the scan line to be turned on or off, and when the switching unit is turned on, the driving unit receives a data signal through the data line to turn on the first power terminal and the second terminal of the driving unit.
In an exemplary embodiment, the turn-on control unit includes a first control transistor having a control terminal electrically connected to the scan line and a second control transistor having a first terminal electrically connected to the second terminal of the current limiting unit and a second terminal electrically connected to the anode of the light emitting element, the control terminal of the second control transistor receiving a turn-on control signal and the first terminal of the second control transistor being electrically connected to the second terminal of the driving unit and the second terminal of the second control transistor being electrically connected to the anode of the light emitting element. The first control transistor receives the scanning signal to be turned on or off through the scanning line, the first control transistor is turned on to conduct the second end of the driving unit, the current limiting unit and the anode of the light emitting element, the second control transistor receives the conduction control signal to be turned on or off, the second control transistor is turned on to conduct the second end of the driving unit and the anode of the light emitting element, and the first control transistor and the second control transistor are not turned on at the same time.
In an exemplary embodiment, the type of the first control transistor is the same as the type of the second control transistor, and when the scan signal is at a high level, the on control signal is at a low level; when the scanning signal is at a low level, the conduction control signal is at a high level.
In an exemplary embodiment, the pixel driving circuit further includes an inversion unit electrically connected to the scan line and the control terminal of the second control transistor, respectively, wherein the inversion unit receives the scan signal through the scan line, inverts a potential of the scan signal to generate the turn-on control signal, and transmits the turn-on control signal to the control terminal of the second control transistor.
In an exemplary embodiment, the type of the first control transistor is opposite to the type of the second control transistor, and the on control signal is high when the scan signal is high; when the scanning signal is at a low level, the conduction control signal is at a low level.
In an exemplary embodiment, a control terminal of the second control transistor is electrically connected to the scan line, and the second control transistor receives a scan signal through the scan line, and the scan signal controls the second control transistor to be turned on or off as the turn-on control signal.
In an exemplary embodiment, the pixel driving circuit further includes a temperature detecting unit and a protection unit. The temperature detection unit is respectively and electrically connected with the control end of the driving unit and the temperature detection unit, and is used for detecting the temperature of the light-emitting element to generate a temperature signal with corresponding potential and outputting the temperature signal to the protection unit, the protection unit is used for comparing the potential of the temperature signal with a reference potential, and when the potential of the temperature signal is greater than the reference potential, the protection unit outputs a closing signal for closing the first power supply.
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 a plurality of pixel driving circuits, wherein the plurality of pixel driving circuits are respectively and electrically connected with the plurality of scanning lines and the plurality of data lines.
In summary, the display panel provided by the embodiment of the application includes a scan line, a data line, and a pixel driving circuit, where the pixel driving circuit includes a driving unit, a current limiting unit, and a conduction control unit, where the conduction control unit is configured to conduct the driving unit, the current limiting unit, and the light emitting element, or is configured to conduct the driving unit and the light emitting element. When the driving unit and the current limiting unit are conducted with the light-emitting element through the conduction control unit, the current limiting unit is used for inhibiting surge current of the light-emitting element, so that aging of the light-emitting element caused by the surge current is avoided, and the service life of the light-emitting element is prolonged. After the current of the light-emitting element is stable for a certain time, the conduction control unit directly conducts the driving unit with the light-emitting element, so that the insertion loss of the current limiting unit is avoided, and meanwhile, the current limiting unit can be prevented from operating for a long time, and the life cycle of the current limiting unit is further prolonged.
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 data line and a pixel driving circuit, the pixel driving circuit includes a driving unit, a current limiting unit and a conduction control unit, and the conduction control unit is used for conducting the driving unit, the current limiting unit and the light emitting element, or conducting the driving unit and the light emitting element. When the driving unit and the current limiting unit are conducted with the light-emitting element through the conduction control unit, the current limiting unit is used for inhibiting surge current of the light-emitting element, so that aging of the light-emitting element caused by the surge current is avoided, and the service life of the light-emitting element is prolonged. After the current of the light-emitting element is stable for a certain time, the conduction control unit directly conducts the driving unit with the light-emitting element, so that the insertion loss of the current limiting unit is avoided, and meanwhile, the current limiting unit can be prevented from operating for a long time, and the life cycle of the current limiting unit is further prolonged.
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 a first configuration of the pixel driving circuit shown in FIG. 3;
FIG. 5 is a schematic diagram showing a comparison of a current curve of a light emitting device according to an embodiment of the present application with a current curve of a light emitting device according to the prior art;
FIG. 6 is a schematic diagram showing the comparison between the timing of the scan signal and the timing of the on control signal in the pixel driving circuit shown in FIG. 4;
fig. 7 is a schematic diagram of a structure of a protection unit of the pixel driving circuit shown in fig. 4;
FIG. 8 is a schematic diagram of a second configuration of the pixel driving circuit shown in FIG. 3;
FIG. 9 is a schematic diagram showing the comparison between the timing of the scan signal and the timing of the on control signal in the pixel driving circuit shown in FIG. 8.
Reference numerals illustrate:
001-a first direction; 002-a second direction; 10-a substrate; 30-a circuit layer; 31 (31 a) -a pixel driving circuit; 50-a light emitting element; 60-packaging layers; 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 switching unit; 313-drive unit; 314—a current limiting unit; 315-a turn-on control unit; 315 a-a first control transistor; 315 b-a second control transistor; 316-a potential maintaining unit; 318-an inverting unit; 318 a-a first inverting transistor; 318 b-a second inverting transistor; 319-a temperature detection unit; 319 a-detect turn-on transistor; 319 c-a voltage dividing resistor; 321-a protection unit; 322-comparator; 322 a-non-inverting input; 322 b-an inverting input; 322 c-a comparison output; RT 1-a first thermistor; RT 2-a first thermistor; c1-capacitance; m1-a switching transistor; m2-drive transistors; VDD 1-a first power supply terminal; VDD 2-a second power supply terminal; VDD 3-a second power supply terminal; GND-ground; GL-scan lines; a DL-data line; vref—reference power terminal.
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 100 provided in the embodiment of the application may at least include a display panel 110, a scan driving circuit 130, a data driving circuit 140, and a timing control circuit (Timing Controller, TCON) 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.
It is understood that the display device 100 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 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 the disclosure is not repeated herein.
In an embodiment of the present application, the display panel 110 may further include a display area 110a and a non-display area 110b disposed at a peripheral side or a part of a peripheral side of the display area 110 a. Wherein the display region 110a is used as a display image, the non-display region 110b is not used as a display image, and a corresponding driving circuit is provided to control the display region 110a to display an image.
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 the embodiment of the present application 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, the plurality of light emitting elements 50 are arranged in an array on a 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, and the circuit layer 30 includes a plurality of scan lines GL, a plurality of data lines DL and a plurality of pixel driving circuits 31. 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 31 is disposed between two adjacent scanning lines GL and two adjacent data lines DL. The plurality of scanning lines GL are electrically connected to the scanning driving circuit 130, the plurality of data lines DL are electrically connected to the data driving circuit 140, and the pixel driving circuit 31 is electrically connected to the scanning lines GL and 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 GL, 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, one of the scan lines GL intersects with a plurality of the data lines DL, and one of the data lines DL intersects with a plurality of the scan lines GL, that is, the plurality of the scan lines GL and the plurality of the data lines DL are disposed in a grid shape as a whole, and accordingly, the plurality of the pixel driving circuits 31 are distributed in an array. One of the pixel driving circuits 31 is electrically connected to one of the scanning lines GL and one of the data lines DL, respectively. Specifically, the pixel driving circuits 31 are disposed between any two adjacent scanning lines GL and any two adjacent data lines DL, the pixel driving circuits 31 located in the same column are all electrically connected to the same data line DL, and the pixel driving circuits 31 located in the same row are all electrically connected to the same scanning line GL.
In an exemplary embodiment, the first direction 001 is perpendicular to the second direction 002, and is insulated from each other among the plurality of scan lines GL, among the plurality of data lines DL, and between the scan lines GL and the data lines DL. 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 the embodiment of the application, referring 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 includes a switching unit 311, a driving unit 313, a current limiting unit 314, and a conduction control unit 315, wherein a control end of the switching unit 311 is electrically connected to the scanning line GL, a first end of the switching unit 311 is electrically connected to the data line DL, a second end of the switching unit 311 is electrically connected to a control end of the driving unit 313, a first end of the driving unit 313 is electrically connected to a first power supply end VDD1, a second end of the driving unit 313 is electrically connected to a first end of the current limiting unit 314 and the conduction control unit 315, a second end of the current limiting unit 314 is further electrically connected to the conduction control unit 315, the conduction control unit 315 is further electrically connected to an anode of the light emitting element 50, and a cathode of the light emitting element 50 is electrically connected to a ground end GND. The conduction control unit 315 is configured to conduct the driving unit 313, the current limiting unit 314, and the light emitting element 50, or conduct the driving unit 313 and the light emitting element 50. When the driving unit 313, the current limiting unit 314, and the light emitting element 50 are turned on, the current limiting unit 314 is used to suppress the surge current of the light emitting element 50.
It will be appreciated that the light emitting element 50 may cause a rapid change in current through the light emitting element 50, i.e. a surge current, in a short time, when it is lit or when the potential of the control terminal of the driving unit 313 is changed. The on control unit 315 is configured to turn on the driving unit 313, the current limiting unit 314, and the light emitting element 50 during a frame frequency period when the light emitting element 50 is turned on or when a potential of a control terminal of the driving unit 313 changes, the current limiting unit 314 suppressing a surge current of the light emitting element 50; after the current of the light emitting element 50 is stabilized for a period of time, the turn-on control unit 315 directly turns on the driving unit 313 and the light emitting element 50, so that the insertion loss of the current limiting unit 314 can be reduced, and the current limiting unit 314 can be prevented from operating for a long time, thereby prolonging the life cycle of the current limiting unit 314.
It will also be appreciated that the potentials at the control terminals of the driving units 313 are different, so that the degree of opening of the driving units 313 is different, and the greater the degree of opening of the driving units 313, the greater the current through the light emitting element 50. Therefore, the change in the potential of the control terminal of the driving unit 313 also causes the light emitting element 50 to generate an inrush current.
In the embodiment of the present application, referring to fig. 5, fig. 5 is a schematic diagram showing a comparison between a current change curve of a light emitting device according to an embodiment of the present application and a current change curve of a light emitting device according to the prior art, wherein a solid line in fig. 5 is a current change curve of a light emitting device according to the prior art, and a stippled line in fig. 5 is a current change of a light emitting device according to an embodiment of the present application. As can be seen from fig. 5, the time required for the current of the light emitting element in the prior art to increase from Ia to Ib is t1, and the time required for the current of the light emitting element 50 in the embodiment of the application to increase from Ia to Ib is t2, wherein t2 is greater than t1. The current of the light emitting element 50 disclosed in the embodiment of the present application increases at a rate smaller than that of the light emitting element in the related art. That is, the current limiting unit 314 suppresses the surge current of the light emitting element 50.
In the embodiment of the present application, the control terminal of the switching unit 311 receives the scan signal through the scan line GL, the first terminal of the switching unit 311 receives the data signal through the data line DL, and the switching unit 311 is turned on or off according to the scan signal. When the switching unit 311 is turned on, the potential of the data signal is applied to the control terminal of the driving unit 313, and the driving unit 313 turns on the first power terminal VDD1 and the second terminal of the driving unit 313 according to the data signal.
In an exemplary embodiment, the switching unit 311 includes a switching transistor M1, and a gate of the switching transistor M1 is a control terminal of the switching unit 311. The source of the switching transistor M1 may be a first terminal of the switching unit 311, and the drain of the switching transistor M1 may be a second terminal of the switching unit 311; the drain of the switching transistor M1 may be the first terminal of the switching unit 311, and the source of the switching transistor M1 may be the second terminal of the switching unit 311, which is not particularly limited in the present application.
In an exemplary embodiment, the driving unit 313 includes a driving transistor M2, and a gate of the driving transistor M2 is a control terminal of the driving unit 313. The source of the driving transistor M2 may be a first end of the driving unit 313, and the drain of the driving transistor M2 may be a second end of the driving unit 313; the drain of the driving transistor M2 may be the first terminal of the driving unit 313, and the source of the driving transistor M2 may be the second terminal of the driving unit 313, which is not particularly limited in the present application.
As shown in fig. 4, in the embodiment of the application, the pixel driving circuit 31 further includes a potential maintaining unit 316, two connection terminals of the potential maintaining unit 316 are electrically connected to the control terminal of the driving unit 313 and the first terminal of the driving unit 313, respectively, and the potential of the data signal is also applied to the potential maintaining unit 316. When the switching unit 311 is turned off, the potential maintaining unit 316 discharges to turn on the driving unit 313.
In an exemplary embodiment, the potential maintaining unit 316 includes a capacitor C1, one end of the capacitor C1 is electrically connected to the gate of the driving transistor M2 and the drain of the switching transistor M1, and the other end of the capacitor C1 is electrically connected to the source of the driving transistor M2 and the first power supply terminal VDD 1.
In summary, the pixel driving circuit 31 provided in the embodiment of the application includes the driving unit 313, the current limiting unit 314, and the on control unit 315, wherein the driving unit 313 is electrically connected to the first power supply terminal VDD1, the first terminal of the current limiting unit 314, and the on control unit 315, the second terminal of the current limiting unit 314 is electrically connected to the on control unit 315, the on control unit 315 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 ground terminal GND. The turn-on control unit 315 is used to turn on the driving unit 313, the current limiting unit 314, and the light emitting element 50, or to turn on the driving unit 313 and the light emitting element 50. When the driving unit 313, the current limiting unit 314, and the light emitting element 50 are turned on, the current limiting unit 314 is configured to suppress the surge current of the light emitting element 50, so that the light emitting element 50 is prevented from aging due to the surge current, and the service life of the light emitting element 50 is further prolonged. After the current of the light emitting element 50 is stabilized for a certain period of time, the turn-on control unit 315 directly turns on the driving unit 313 and the light emitting element 50, so that the insertion loss of the current limiting unit 314 is avoided, and meanwhile, the current limiting unit 314 can be prevented from operating for a long time, thereby prolonging the life cycle of the current limiting unit 314.
In the embodiment of the present application, referring to fig. 4 and fig. 5 together, the current limiting unit 314 includes a first thermistor RT1, one end of the first thermistor RT1 is electrically connected to the second end of the driving unit 313, and the other end of the first thermistor RT1 is electrically connected to the conduction control unit 315. The driving unit 313 and the current limiting unit 314 increase the conduction time with the light emitting element 50 through the conduction control unit 315, and the temperature of the first thermistor RT1 increases, so that the resistance value of the first thermistor RT1 decreases, so that the current of the light emitting element 50 increases; the driving unit 313 is turned on with the light emitting element 50 by the turn-on control unit 315, the temperature of the first thermistor RT1 is reduced, and the resistance of the first thermistor RT1 is increased.
In the embodiment of the present application, the first thermistor RT1 is a negative temperature coefficient (Negative Temperature Coefficient, NTC) thermistor, that is, the resistance of the first thermistor RT1 decreases exponentially with the increase of temperature. In the embodiment of the present application, the resistance of the first thermistor RT1 may be reduced to several tenths of the resistance of the first thermistor RT1 at room temperature under the influence of the temperature increase. When the driving unit 313 and the current limiting unit 314 are turned on with the light emitting element 50 through the turn-on control unit 315, the first thermistor RT1 generates heat itself, so that its own temperature increases, and thus the resistance of the first thermistor RT1 decreases, and as the turn-on time increases, the resistance of the first thermistor RT1 decreases, and thus the current of the light emitting element 50 increases and gradually stabilizes, and at this time, the resistance of the first thermistor RT1 is small. Since the resistance value of the first thermistor RT1 is small, when the driving unit 313 is directly connected to the light emitting element 50 through the on control unit 315, the current of the light emitting element 50 does not change, and the light emitting brightness of the light emitting element 50 does not change. Meanwhile, since the first thermistor RT1 is not turned on, the temperature of the first thermistor RT1 gradually decreases, the resistance thereof gradually increases, and the coming of the next frame frequency is waited for, and the occurrence of surge current is continuously suppressed. Therefore, the first thermistor RT1 provided by the present application can suppress not only the surge current at the time of lighting the light emitting element 50, but also the surge current occurring in the light emitting element 50 when the next frame rate arrives.
As shown in fig. 4, in the embodiment of the present application, the on control unit 315 includes a first control transistor 315a and a second control transistor 315b, a control terminal of the first control transistor 315a is electrically connected to the scan line GL, a first terminal of the first control transistor 315a is electrically connected to a second terminal of the current limiting unit 314, and a second terminal of the first control transistor 315a is electrically connected to an anode of the light emitting element 50. The control terminal of the second control transistor 315b is configured to receive a turn-on control signal, the first terminal of the second control transistor 315b is electrically connected to the second terminal of the driving unit 313, and the second terminal of the second control transistor 315b is electrically connected to the anode of the light emitting element 50. The control end of the first control transistor 315a receives a scan signal through the scan line GL, the first control transistor 315a is turned on under the control of the scan signal to turn on the second end of the driving unit 313, the current limiting unit 314 and the anode of the light emitting element 50, the control end of the second control transistor 315b receives the turn-on control signal, and the second control transistor 315b is turned on under the control of the turn-on control signal to turn on the second end of the driving unit 313 and the anode of the light emitting element 50. Wherein the first control transistor 315a and the second control transistor 315b are not turned on at the same time, i.e., one of the first control transistor 315a and the second control transistor 315b is turned on at the same time.
It is understood that the first control transistor 315a and the second control transistor 315b are not turned on at the same time means that: when the first control transistor 315a is turned on, the second control transistor 315b is turned off; when the second control transistor 315b is turned on, the first control transistor 315a is turned off. Therefore, switching of the first thermistor RT1 between on and off is achieved by the first control transistor 315a not being turned on simultaneously with the second control transistor 315 b. For example, the driving unit 313 and the first thermistor RT1 are electrically connected to the anode of the light emitting element 50 through the first control transistor 315a by the first control transistor 315a being turned on; the driving unit 313 is electrically connected to the anode of the light emitting element 50 through the second control transistor 315b by being turned on through the second control transistor 315 b.
In an exemplary embodiment, the first control transistor 315a receives the scan signal to be turned on or off through the scan line GL, and the second control transistor 315b receives the turn-on control signal to be turned on or off.
It may be further understood that both the switching unit 311 and the first control transistor 315a receive the scan signal to be turned on, and after the switching unit 311 is turned on, the driving unit 313 receives the data signal to be turned on, so that the driving unit 313 and the first control transistor 315a are turned on substantially simultaneously. Therefore, by the first control transistor 315a also being electrically connected to the scanning line GL, the timing accuracy of the turn-on of the first control transistor 315a is ensured.
In an exemplary embodiment, the gate of the first control transistor 315a is a control terminal. The source of the first control transistor 315a may be a first terminal, and the drain of the first control transistor 315a may be a second terminal; alternatively, the drain of the first control transistor 315a may be a first terminal, and the source of the first control transistor 315a may be a second terminal, which is not particularly limited in the present application.
In an exemplary embodiment, the gate of the second control transistor 315b is a control terminal. The source of the second control transistor 315b may be a first terminal, and the drain of the second control transistor 315b may be a second terminal; alternatively, the drain of the second control transistor 315b may be a first terminal, and the source of the second control transistor 315b may be a second terminal, which is not particularly limited in the present application.
In an embodiment of the present application, referring to fig. 6, fig. 6 is a schematic diagram illustrating a comparison between a timing of a scan signal and a timing of a turn-on control signal in the pixel driving circuit shown in fig. 4. Wherein, the types of the first control transistor 315a and the second control transistor 315b are the same, and when the scanning signal is at a high level, the on control signal is at a low level; alternatively, when the scan signal is at a low level, the on control signal is at a high level.
In an exemplary embodiment, referring to fig. 4, the first control transistor 315a and the second control transistor 315b may be N-type MOS transistors, and when the first control transistor 315a receives the high-level scan signal to be turned on, the second control transistor 315b receives the low-level turn-on control signal to be turned off; when the first control transistor 315a receives the scan signal of low level to be turned off, the second control transistor 315b receives the turn-on control signal of high level to be turned on.
The first control transistor 315a and the second control transistor 315b may be P-type MOS transistors, and when the first control transistor 315a receives the low-level scan signal and is turned on, the second control transistor 315b receives the high-level turn-on control signal and is turned off; when the first control transistor 315a receives the scan signal of high level to be turned off, the second control transistor 315b receives the turn-on control signal of low level to be turned on.
In the embodiment of the present application, the first control transistor 315a and the second control transistor 315b are N-type MOS transistors, that is, the first control transistor 315a receives the high-level scan signal to be turned on, and the second control transistor 315b receives the high-level turn-on control signal to be turned on.
In the embodiment of the present application, referring to fig. 4, the pixel driving circuit 31 further includes an inversion unit 318, and the inversion unit 318 is electrically connected to the scan line GL and the control terminal of the second control transistor 315b of the on control unit 315, respectively. The inverting unit 318 is configured to receive a scan signal through the scan line, invert the potential of the scan signal to generate the on control signal, and transmit the on control signal to the control terminal of the second control transistor 315b of the on control unit 315.
It is understood that the inverting unit 318 is configured to convert the scan signal of a high level into the on control signal of a low level and convert the scan signal of a low level into the scan signal of a high level.
It is also understood that by inverting the scan signal by the inverting unit 318 to generate an on control signal, and the first control transistor 315a is of the same type as the second control transistor 315b, it is achieved that the first control transistor 315a is on while the second control transistor 315b is off, and that the second control transistor 315b is on while the first control transistor 315a is off. Therefore, by electrically connecting the inversion unit 318 with the scan line GL, timing accuracy of the second control transistor 315b turned on can be ensured.
As shown in fig. 4, in an exemplary embodiment, the inversion unit 318 includes a first inversion transistor 318a and a second inversion transistor 318b, the control terminal of the first inversion transistor 318a is electrically connected to the scan line GL, the first terminal of the first inversion transistor 318a is electrically connected to the ground terminal GND, the second terminal of the first inversion transistor 318a is electrically connected to the control terminal of the second control transistor 315b of the turn-on control unit 315, and the control terminal of the second inversion transistor 318b is electrically connected to the scan line GL. A first terminal of the second inverting transistor 318b is electrically connected to a second power supply terminal VDD2, and a second terminal of the second inverting transistor 318b is electrically connected to a control terminal of the second control transistor 315b of the turn-on control unit 315.
Specifically, the first inverting transistor 318a receives the high-level scan signal through the scan line GL to turn on the ground GND and the control terminal of the second control transistor 315b, and the potential of the ground GND is applied to the control terminal of the second control transistor 315b, so that the second control transistor 315b is turned off; the second inverter transistor 318b receives the scan signal of a high level through the scan line GL to be turned off. The second inverter transistor 318b receives the scan signal of low level through the scan line GL to turn on the second power terminal VDD2 and the control terminal of the second control transistor 315b, and the potential of the second power terminal VDD2 is applied to the control terminal of the second control transistor 315b, so that the second control transistor 315b is turned on; the first inverter transistor 318a receives the scan signal of a low level through the scan line GL to be turned off.
In an exemplary embodiment, the ground GND is low level.
In an embodiment of the present application, please refer to fig. 4 and fig. 7, fig. 7 is a schematic diagram of a protection unit of the pixel driving circuit shown in fig. 4. The pixel driving circuit 31 further includes a temperature detecting unit 319 and a protection unit 321, wherein the temperature detecting unit 319 is electrically connected to a control end of the driving unit 313 and the temperature detecting unit 319 is electrically connected to each other, the temperature detecting unit 319 is configured to detect a temperature of the light emitting element 50 to generate a temperature signal with a corresponding potential, and output the temperature signal to the protection unit 321, the protection unit 321 is configured to compare a potential of the temperature signal with a reference potential, and when the potential of the temperature signal is greater than the reference potential, the protection unit 321 outputs a turn-off signal for turning off the first power VDD 1.
It is understood that when the light emitting element 50 emits light for a long time, is short-circuited, or is damaged, the temperature of the light emitting element 50 may be relatively high. When the temperature of the light emitting element 50 is higher than the safety temperature, the temperature detecting unit 319 cooperates with the driving unit 313 to turn off the first power supply VDD1, thereby realizing the protection of the light emitting element 50. Wherein, when the temperature of the light emitting element 50 is higher than the safety temperature, it means that the light emitting element 50 is extremely easily damaged or has been damaged.
In an embodiment of the present application, the temperature detecting unit 319 includes a detecting turn-on transistor 319a, a second thermistor RT2, and a voltage dividing resistor 319c, wherein a control terminal of the detecting turn-on transistor 319a is electrically connected to a control terminal of the driving unit 313, a first terminal of the detecting turn-on transistor 319a is electrically connected to a third power terminal VDD3, a second terminal of the detecting turn-on transistor 319a is electrically connected to a first terminal of the second thermistor RT2, a second terminal of the second thermistor RT2 is electrically connected to one terminal of the protecting unit 321 and one terminal of the voltage dividing resistor 319c, and the other terminal of the voltage dividing resistor 319c is electrically connected to the ground terminal GND. The second thermistor RT2 changes its resistance value according to the temperature of the light emitting element 50, and the second end of the second thermistor RT2 outputs the temperature signal of the corresponding potential to the protection unit 321.
It is understood that the timing of the turn-on of the detection turn-on transistor 319a is consistent with the timing of the turn-on of the driving unit 313, that is, when the driving unit 313 is turned on, the temperature detection unit 319 detects the temperature of the light emitting element 50 and generates the temperature signal of the corresponding potential.
In an embodiment of the present application, the protection unit 321 may at least include a comparator 322, where the comparator 322 includes a non-inverting input terminal 322a, an inverting input terminal 322b, and a comparing output terminal 322c, where the non-inverting input terminal 322a is electrically connected to the second terminal of the second thermistor RT2 to receive the temperature signal, and the inverting input terminal 322b is electrically connected to the reference power terminal Vref to receive the reference potential. When the potential of the temperature signal is greater than the reference potential, the comparison output terminal 322c outputs a turn-off signal for turning off the first power supply VDD.
In an embodiment of the present application, the display device 100 may include a power supply circuit including the first power supply terminal VDD1, the second power supply VDD2, and the third power supply terminal VDD3. The power supply circuit is electrically connected to the comparison output terminal 322c of the comparator 322 to receive the turn-off signal, and the power supply circuit turns off the first power supply terminal VDD1 according to the turn-off signal.
In another embodiment of the present application, please refer to fig. 8, fig. 8 is a schematic diagram of a second structure of the pixel driving circuit shown in fig. 3. The pixel driving circuit 31a of the second structure is different from the pixel driving circuit 31 of the first structure in that: the pixel driving circuit 31a does not include the inversion unit 318. Specifically, the control terminal of the first control transistor 315a and the control terminal of the second control transistor 315b are electrically connected to the scan line GL, and the scan signal is used as the on control signal to control the second control transistor 315b to be turned on or off.
In another embodiment of the present application, please refer to fig. 8 and fig. 9 together, fig. 9 is a schematic diagram illustrating a comparison between a timing of a scan signal and a timing of a turn-on control signal in the pixel driving circuit shown in fig. 8. The type of the first control transistor 315a is opposite to the type of the second control transistor 315b, and when the scan signal is at a high level, the on control signal is at a high level; alternatively, when the scan signal is at a low level, the on control signal is at a low level.
In an exemplary embodiment, the first control transistor 315a may be an N-type MOS transistor, the second control transistor 315b may be a P-type MOS transistor, the on control signal is high when the scan signal is high, the first control transistor 315a receives the high scan signal to be turned on, and the second control transistor 315b receives the high on control signal to be turned off. When the scan signal is at a low level, the on control signal is at a low level, the first control transistor 315a receives the scan signal at a low level and is turned off, and the second control transistor 315b receives the on control signal at a low level and is turned on.
In an exemplary embodiment, the first control transistor 315a may be a P-type MOS transistor, the second control transistor 315b may be an N-type MOS transistor, when the scanning signal is at a low level, the on control signal is at a low level, the first control transistor 315a receives the scanning signal at the low level to be turned on, and the second control transistor 315b receives the on control signal at the low level to be turned off. When the scan signal is at a high level, the on control signal is at a high level, the first control transistor 315a receives the scan signal at a high level and is turned off, and the second control transistor 315b receives the on control signal at a high level and is turned on.
It can be appreciated that the control terminal of the second control transistor 315b is directly electrically connected to the scan line GL, and the type of the first control transistor 315a is opposite to the type of the second control transistor 315b, so that the first control transistor 315a is turned on while the second control transistor 315b is turned off, and the second control transistor 315b is turned on while the first control transistor 315a is turned off. Therefore, by directly electrically connecting the control terminal of the second control transistor 315b to the scan line GL, the timing accuracy of the turn-on of the second control transistor 315b can be ensured.
In summary, the pixel driving circuit 31 provided in the embodiment of the application includes the driving unit 313, the current limiting unit 314, and the on control unit 315, wherein the driving unit 313 is electrically connected to the first power supply terminal VDD1, the first terminal of the current limiting unit 314, and the on control unit 315, the second terminal of the current limiting unit 314 is electrically connected to the on control unit 315, the on control unit 315 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 ground terminal GND. The conduction control unit 315 is configured to conduct the driving unit 313, the current limiting unit 314, and the light emitting element 50, or conduct the driving unit 313 and the light emitting element 50. When the driving unit 313, the current limiting unit 314, and the light emitting element 50 are turned on, the current limiting unit 314 is configured to suppress the surge current of the light emitting element 50, so that the light emitting element 50 is prevented from aging due to the surge current, and the service life of the light emitting element 50 is further prolonged. After the current of the light emitting element 50 is stabilized for a certain period of time, the turn-on control unit 315 directly turns on the driving unit 313 and the light emitting element 50, so that the insertion loss of the current limiting unit 314 is avoided, and meanwhile, the current limiting unit 314 can be prevented from operating for a long time, thereby prolonging the life cycle of the current limiting unit 314.
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 (10)
1. The pixel driving circuit comprises a driving unit, wherein a first end of the driving unit is electrically connected with a first power end, and is characterized by further comprising a current limiting unit and a conduction control unit, wherein the first end of the current limiting unit and the conduction control unit are respectively electrically connected with a second end of the driving unit, the second end of the current limiting unit is also electrically connected with the conduction control unit, the conduction control unit is also electrically connected with an anode of a light emitting element, and a cathode of the light emitting element is electrically connected with a grounding end; wherein,
The conduction control unit is used for conducting the driving unit, the current limiting unit and the light emitting element, or conducting the driving unit and the light emitting element;
when the driving unit and the current limiting unit are conducted with the light emitting element through the conduction control unit, the current limiting unit is used for inhibiting surge current of the light emitting element.
2. The pixel driving circuit according to claim 1, further comprising a switching unit, wherein a control terminal of the switching unit is electrically connected to a scan line, a first terminal of the switching unit is electrically connected to a data line, a second terminal of the switching unit is electrically connected to a control terminal of the driving unit, the switching unit receives a scan signal through the scan line to turn on or off, and when the switching unit is turned on, the driving unit receives a data signal through the data line to turn on the first power supply terminal and the second terminal of the driving unit.
3. The pixel driving circuit according to claim 2, wherein the turn-on control unit includes a first control transistor and a second control transistor, a control terminal of the first control transistor is electrically connected to the scan line, a first terminal of the first control transistor is electrically connected to a second terminal of the current limiting unit, a second terminal of the first control transistor is electrically connected to an anode of the light emitting element, a control terminal of the second control transistor is for receiving a turn-on control signal, a first terminal of the second control transistor is electrically connected to a second terminal of the driving unit, and a second terminal of the second control transistor is electrically connected to an anode of the light emitting element; wherein,
The first control transistor receives the scanning signal through the scanning line to be conducted or cut off, the first control transistor is conducted to conduct the second end of the driving unit, the current limiting unit and the anode of the light emitting element, the second control transistor receives the conducting control signal to be conducted or cut off, the second control transistor is conducted to conduct the second end of the driving unit and the anode of the light emitting element, and the first control transistor and the second control transistor are not conducted simultaneously.
4. A pixel driving circuit according to claim 3, wherein the type of the first control transistor is the same as the type of the second control transistor, and the on control signal is low when the scanning signal is high; when the scanning signal is at a low level, the conduction control signal is at a high level.
5. The pixel driving circuit according to claim 4, further comprising an inversion unit electrically connected to the scan line and the control terminal of the second control transistor, respectively, wherein the inversion unit receives the scan signal through the scan line, inverts a potential of the scan signal to generate the on control signal, and transmits the on control signal to the control terminal of the second control transistor.
6. A pixel driving circuit according to claim 3, wherein the type of the first control transistor is opposite to the type of the second control transistor, and the on control signal is high when the scanning signal is high; when the scanning signal is at a low level, the conduction control signal is at a low level.
7. The pixel driving circuit according to claim 6, wherein a control terminal of the second control transistor is electrically connected to the scanning line, the second control transistor receives a scanning signal through the scanning line, and the scanning signal controls the second control transistor to be turned on or off as the on control signal.
8. The pixel driving circuit according to any one of claims 1 to 7, further comprising a temperature detection unit electrically connected to the control terminal of the driving unit and the protection unit, respectively, the temperature detection unit being configured to detect a temperature of the light emitting element to generate a temperature signal of a corresponding potential and output the temperature signal to the protection unit, the protection unit being configured to compare a potential of the temperature signal with a reference potential, and when the potential of the temperature signal is greater than the reference potential, the protection unit outputting a turn-off signal for turning off the first power supply.
9. 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 8, the plurality of pixel driving circuits being electrically connected to the plurality of scan lines and the plurality of data lines, respectively.
10. A display device comprising a scan driving circuit, a data driving circuit, and the display panel according to claim 9, wherein the display panel is electrically connected to the scan driving circuit and the data driving circuit, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211662816.1A CN115938302B (en) | 2022-12-23 | 2022-12-23 | Pixel driving circuit, display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211662816.1A CN115938302B (en) | 2022-12-23 | 2022-12-23 | Pixel driving circuit, display panel and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115938302A CN115938302A (en) | 2023-04-07 |
| CN115938302B true CN115938302B (en) | 2023-11-03 |
Family
ID=86655799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211662816.1A Active CN115938302B (en) | 2022-12-23 | 2022-12-23 | Pixel driving circuit, display panel and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115938302B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106486041A (en) * | 2017-01-03 | 2017-03-08 | 京东方科技集团股份有限公司 | A kind of image element circuit, its driving method and related display apparatus |
| WO2018113221A1 (en) * | 2016-12-20 | 2018-06-28 | 京东方科技集团股份有限公司 | Oled pixel circuit and drive method thereof, and display apparatus |
| CN109166525A (en) * | 2018-10-15 | 2019-01-08 | 东南大学 | A kind of pixel circuit and method improving silicon substrate OLED micro-display current stability |
| TWI675361B (en) * | 2018-03-27 | 2019-10-21 | 友達光電股份有限公司 | Display device |
| CN113113426A (en) * | 2021-03-19 | 2021-07-13 | 武汉华星光电半导体显示技术有限公司 | Display panel and preparation method thereof |
| CN114974116A (en) * | 2022-05-31 | 2022-08-30 | 惠科股份有限公司 | Pixel driving circuit and pixel driving method |
| CN114974115A (en) * | 2022-05-30 | 2022-08-30 | 京东方科技集团股份有限公司 | Display panel and display device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4049018B2 (en) * | 2003-05-19 | 2008-02-20 | ソニー株式会社 | Pixel circuit, display device, and driving method of pixel circuit |
| JP4049037B2 (en) * | 2003-06-30 | 2008-02-20 | ソニー株式会社 | Display device and driving method thereof |
| CA2443206A1 (en) * | 2003-09-23 | 2005-03-23 | Ignis Innovation Inc. | Amoled display backplanes - pixel driver circuits, array architecture, and external compensation |
| CN101106850A (en) * | 2006-07-12 | 2008-01-16 | 鸿富锦精密工业（深圳）有限公司 | LED drive circuit |
| JP4281765B2 (en) * | 2006-08-09 | 2009-06-17 | セイコーエプソン株式会社 | Active matrix light emitting device, electronic device, and pixel driving method for active matrix light emitting device |
| JP2008170756A (en) * | 2007-01-12 | 2008-07-24 | Sony Corp | Display device |
| KR101860860B1 (en) * | 2011-03-16 | 2018-07-02 | 삼성디스플레이 주식회사 | Organic Light Emitting Display and Driving Method Thereof |
-
2022
- 2022-12-23 CN CN202211662816.1A patent/CN115938302B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018113221A1 (en) * | 2016-12-20 | 2018-06-28 | 京东方科技集团股份有限公司 | Oled pixel circuit and drive method thereof, and display apparatus |
| CN106486041A (en) * | 2017-01-03 | 2017-03-08 | 京东方科技集团股份有限公司 | A kind of image element circuit, its driving method and related display apparatus |
| TWI675361B (en) * | 2018-03-27 | 2019-10-21 | 友達光電股份有限公司 | Display device |
| CN109166525A (en) * | 2018-10-15 | 2019-01-08 | 东南大学 | A kind of pixel circuit and method improving silicon substrate OLED micro-display current stability |
| CN113113426A (en) * | 2021-03-19 | 2021-07-13 | 武汉华星光电半导体显示技术有限公司 | Display panel and preparation method thereof |
| CN114974115A (en) * | 2022-05-30 | 2022-08-30 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN114974116A (en) * | 2022-05-31 | 2022-08-30 | 惠科股份有限公司 | Pixel driving circuit and pixel driving method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115938302A (en) | 2023-04-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101995714B1 (en) | Display device | |
| CN101739945B (en) | Organic electro-luminescence display device | |
| US20080136771A1 (en) | Backlight control circuit with primary and secondary switch units | |
| WO2018072429A1 (en) | Display panel and display device | |
| US7330003B2 (en) | Backlight control circuit with two transistors | |
| US10649509B2 (en) | Display device capable of detecting whether a power cable is abnormally connected | |
| KR100370332B1 (en) | Flat panel display device having scan line driving circuit, and driving method thereof | |
| KR20240003745A (en) | Drive circuit, display module and display device | |
| EP4303860A1 (en) | Organic light-emitting diode control circuit and display panel | |
| CN115938302B (en) | Pixel driving circuit, display panel and display device | |
| KR102415380B1 (en) | Display pannel and display device having the same | |
| CN111402782A (en) | Digital driving pixel circuit and method for digitally driving pixel | |
| US7843151B2 (en) | Backlight control circuit with micro controller feeding operating state of load circuit back to pulse width modulation integrated circuit | |
| US20220005434A1 (en) | Display device | |
| US8896517B2 (en) | Integrated backlight driving chip and LED backlight device | |
| JP7301947B2 (en) | Display device | |
| US20220293037A1 (en) | Array substrate, driving method thereof, and display apparatus | |
| US20220254306A1 (en) | Gamma standard voltage generating circuit, gamma driving voltage generating circuit and display device | |
| US7812795B2 (en) | Modulation of common voltage and method for controlling AMOLED panel | |
| US11335290B2 (en) | Drive circuit, drive device and display device | |
| CN115953985B (en) | Pixel unit, display panel and display device | |
| US8059081B2 (en) | Display device | |
| US20240029672A1 (en) | Backlight module brightness calibration method, display device thereof, and brightness calibration device thereof | |
| CN115938307B (en) | Pixel circuit, display panel and display device | |
| US11645984B2 (en) | Display device driving method, and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |