CN115482786A - Pixel driving circuit and display panel - Google Patents
Pixel driving circuit and display panel Download PDFInfo
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- CN115482786A CN115482786A CN202211316055.4A CN202211316055A CN115482786A CN 115482786 A CN115482786 A CN 115482786A CN 202211316055 A CN202211316055 A CN 202211316055A CN 115482786 A CN115482786 A CN 115482786A
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- 208000032005 Spinocerebellar ataxia with axonal neuropathy type 2 Diseases 0.000 description 8
- 208000033361 autosomal recessive with axonal neuropathy 2 spinocerebellar ataxia Diseases 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- 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]
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- Engineering & Computer Science (AREA)
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application provides a pixel driving circuit and a display panel, which relate to the technical field of display, wherein the pixel driving circuit comprises a data input circuit, an energy storage circuit, a light-emitting control circuit, a first switch circuit, a second switch circuit, a third switch circuit and a fourth switch circuit; the input end of the light-emitting control circuit is electrically connected with a first power supply through a first switch circuit, is electrically connected with a second power supply through a second switch circuit, and the output end of the light-emitting control circuit is electrically connected with the anode of the light-emitting device; the second switch circuit and the third switch circuit are switched on in at least part of the non-light-emitting period and switched off in the light-emitting period; the first switch circuit and the fourth switch circuit are turned on in a light-emitting period and turned off in a non-light-emitting period. The technical scheme provided by the application can improve the luminous intensity of the OLED.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a pixel driving circuit and a display panel.
Background
Display panels based on Light Emitting devices such as Organic Light Emitting Diodes (OLEDs) are increasingly widely used in products such as televisions and mobile phones because of their characteristics of lightness, thinness, energy saving, wide viewing angle, wide color gamut, high contrast, etc.
With the use of the OLED, the light emission intensity of the OLED may gradually decrease, affecting the display effect. Therefore, how to increase the luminous intensity of the OLED is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the present disclosure provides a pixel driving circuit and a display panel, which are used to improve the light emitting intensity of the OLED and improve the display effect.
In order to achieve the above object, in a first aspect, an embodiment of the present application provides a pixel driving circuit, including: the light-emitting control circuit comprises a data input circuit, an energy storage circuit, a light-emitting control circuit, a first switch circuit, a second switch circuit, a third switch circuit and a fourth switch circuit;
the data input circuit is electrically connected with the control end of the light-emitting control circuit and is used for outputting data voltage to the light-emitting control circuit;
one end of the energy storage circuit is electrically connected with the control end of the light-emitting control circuit, the other end of the energy storage circuit is electrically connected with the input end of the light-emitting control circuit, and the energy storage circuit is used for storing electric energy;
the input end of the light-emitting control circuit is electrically connected with a first power supply through the first switch circuit and is electrically connected with a second power supply through the second switch circuit, the output end of the light-emitting control circuit is electrically connected with the anode of a light-emitting device, the light-emitting control circuit is used for outputting driving current to the light-emitting device in a light-emitting stage, the cathode of the light-emitting device is electrically connected with the first power supply through the third switch circuit and is electrically connected with the second power supply through the fourth switch circuit, the first power supply outputs high potential voltage, and the second power supply outputs low potential voltage;
the second switch circuit and the third switch circuit are switched on in at least part of the non-light-emitting period and switched off in the light-emitting period; the first switch circuit and the fourth switch circuit are turned on in the light-emitting period and turned off in the non-light-emitting period.
As an optional implementation manner of the embodiment of the present application, the first switching circuit includes a first switching tube, and the fourth switching circuit includes a fourth switching tube;
a first pole of the first switch tube is electrically connected with the first power supply, a second pole of the first switch tube is electrically connected with the input end of the light-emitting control circuit, and a control pole of the first switch tube is electrically connected with the output end of the first scanning line;
and a first pole of the fourth switching tube is electrically connected with the second power supply, a second pole of the fourth switching tube is electrically connected with a cathode of the light-emitting device, and a control pole of the fourth switching tube is electrically connected with an output end of the first scanning line.
As an optional implementation manner of the embodiment of the present application, the first switching tube and the fourth switching tube are both PMOS tubes; the first scanning line outputs a low potential signal in the light-emitting stage and outputs a high potential signal in the non-light-emitting stage.
As an optional implementation manner of the embodiment of the present application, the second switching circuit includes a second switching tube, and the third switching circuit includes a third switching tube;
a first pole of the second switch tube is electrically connected with the second power supply, a second pole of the second switch tube is electrically connected with the input end of the light-emitting control circuit, and a control pole of the second switch tube is electrically connected with the output end of the second scanning line;
the first pole of the third switch tube is electrically connected with the first power supply, the second pole of the third switch tube is electrically connected with the cathode of the light-emitting device, and the control pole of the third switch tube is electrically connected with the output end of the second scanning line.
As an optional implementation manner of the embodiment of the present application, the second switching tube and the third switching tube are both PMOS tubes; the second scanning line outputs a high potential signal in the light-emitting stage and outputs a low potential signal in at least part of the non-light-emitting stage.
As an optional implementation manner of this embodiment, the pixel driving circuit further includes: one end of the fifth switch circuit is electrically connected with the input end of the light-emitting control circuit, and the other end of the fifth switch circuit is electrically connected with the cathode of the light-emitting device;
the non-lighting phase comprises a first non-lighting phase and a second non-lighting phase, and the second non-lighting phase is positioned between the first non-lighting phase and the lighting phase;
the fifth switch circuit is turned on in the first non-light-emitting period and turned off in the second non-light-emitting period and the light-emitting period;
the second switch circuit and the third switch circuit are turned on in the second non-emission period and turned off in the first non-emission period and the emission period.
As an optional implementation manner of this embodiment, the fifth switching circuit includes a fifth switching tube, a first pole of the fifth switching tube is electrically connected to the input terminal of the light-emitting control circuit, a second pole of the fifth switching tube is electrically connected to the cathode of the light-emitting device, and a control pole of the fifth switching tube is electrically connected to the output terminal of the third scan line.
As an optional implementation manner of the embodiment of the present application, the fifth switching tube is a PMOS tube; the third scanning line outputs a low potential signal in the first non-light-emission period, and outputs a high potential signal in the second non-light-emission period and the light-emission period.
As an optional implementation manner of the embodiment of the present application, the light emission control circuit includes a sixth switching circuit, a seventh switching circuit, and a driving thin film transistor;
the sixth switching circuit is connected between the first switching circuit and the input end of the driving thin film transistor, and the seventh switching circuit is connected between the output end of the driving thin film transistor and the anode of the light emitting device;
the sixth switching circuit and the seventh switching circuit are turned off when the fifth switching circuit is turned on, and are turned on when the fifth switching circuit is turned off.
In a second aspect, an embodiment of the present application provides a display panel, including a plurality of pixel units, each of the pixel units including a light emitting device and a pixel driving circuit as described in any one of the first aspect or the first aspect.
The pixel driving circuit and the display panel provided by the embodiment of the application comprise a data input circuit, an energy storage circuit, a light-emitting control circuit, a first switch circuit, a second switch circuit, a third switch circuit and a fourth switch circuit; the data input circuit is electrically connected with the control end of the light-emitting control circuit and is used for outputting data voltage to the light-emitting control circuit; one end of the energy storage circuit is electrically connected with the control end of the light-emitting control circuit, the other end of the energy storage circuit is electrically connected with the input end of the light-emitting control circuit, and the energy storage circuit is used for storing electric energy; the input end of the light-emitting control circuit is electrically connected with a first power supply through a first switch circuit and is electrically connected with a second power supply through a second switch circuit, the output end of the light-emitting control circuit is electrically connected with the anode of the light-emitting device, the light-emitting control circuit is used for outputting driving current to the light-emitting device in a light-emitting stage, the cathode of the light-emitting device is electrically connected with the first power supply through a third switch circuit and is electrically connected with the second power supply through a fourth switch circuit, the first power supply outputs high potential voltage, and the second power supply outputs low potential voltage; the second switch circuit and the third switch circuit are switched on in at least part of the non-light-emitting period and switched off in the light-emitting period; the first switch circuit and the fourth switch circuit are turned on in a light-emitting period and turned off in a non-light-emitting period. In the above technical solution, in at least a part of non-light emitting period, the second switch circuit and the third switch circuit are turned on, the first power supply and the second power supply apply a reverse bias to the light emitting device to consume redundant electrons and holes in the light emitting device, and in the light emitting period, the first switch circuit and the fourth switch circuit are turned on, the first power supply and the second power supply apply a forward bias to the light emitting device, and the light emitting device emits light.
Drawings
Fig. 1 is a schematic structural diagram of any one pixel unit in a display panel provided in an embodiment of the present application;
FIG. 2 is a circuit diagram of the pixel driving circuit shown in FIG. 1;
fig. 3 is an operation timing diagram of a pixel driving circuit according to an embodiment of the present disclosure.
Detailed Description
The embodiments of the present application are described below with reference to the drawings. The terminology used in the description of the embodiments herein is for the purpose of describing particular embodiments herein only and is not intended to be limiting of the application. These several specific embodiments may be combined with each other below, and details of the same or similar concepts or processes may not be repeated in some embodiments.
The Light Emitting device may be an OLED, an inorganic Light Emitting Diode (LED), a Quantum Dot Light Emitting diode (QLED), a submillimeter Light Emitting diode (Mini LED), or the like; the embodiments of the present application take the light emitting device as an OLED as an example, and perform an exemplary description.
Fig. 1 is a schematic structural diagram of any one pixel unit in a display panel provided in an embodiment of the present application, and as shown in fig. 1, the pixel unit may include: the pixel driving circuit comprises a first power supply VDD, a second power supply VSS, a pixel driving circuit and an OLED.
The first power source VDD may output a high potential voltage, and the second power source VSS may output a low potential voltage.
The pixel driving circuit may include: a data input circuit 10, a drive control circuit 20, a tank circuit 30, a light emission control circuit 40, a first switch circuit 50, a second switch circuit 60, a third switch circuit 70, a fourth switch circuit 80, and a fifth switch circuit 90.
The data input circuit 10 is electrically connected to a control terminal of the light emission control circuit 40, and outputs a data voltage to the light emission control circuit 40.
One end of the energy storage circuit 30 is electrically connected to the control end of the light-emitting control circuit 40, the other end is electrically connected to the input end of the light-emitting control circuit 40, and the energy storage circuit 30 is used for storing electric energy.
The driving control circuit 20 is connected between the output terminal of the data input circuit 10 and the control terminal of the light emission control circuit 40, and is configured to adjust a voltage of the control terminal of the light emission control circuit 40 to compensate for a threshold voltage of the driving thin film transistor 401 in the light emission control circuit 40.
The input terminal of the light emission control circuit 40 is electrically connected to a first power supply VDD through a first switch circuit 50, and is electrically connected to a second power supply VSS through a second switch circuit 60, the output terminal of the light emission control circuit 40 is electrically connected to the anode of the OLED, and the light emission control circuit 40 is configured to output a driving current to the OLED in a light emission phase. The cathode of the OLED is electrically connected to a first power source VDD through a third switch circuit 70 and to a second power source VSS through a fourth switch circuit 80.
The second and third switch circuits 60 and 70 are turned on during at least a part of a non-emission period (e.g., turned on during a threshold voltage compensation period and a data voltage writing period), and the first and second power sources VDD and VSS apply a reverse bias to the OLED, so that unnecessary electrons and holes in the OLED can be consumed; in the light emitting stage, the first switch circuit 50 and the fourth switch circuit 80 are turned on, the second switch circuit 60 and the third switch circuit 70 are turned off, the first power supply VDD and the second power supply VSS apply a forward bias to the OLED, and the OLED emits light.
It will be appreciated that the first switching circuit 50 and the fourth switching circuit 80 are both off throughout the non-light emitting period.
One end of the fifth switch circuit 90 is electrically connected to the input end of the light-emitting control circuit 40, and the other end of the fifth switch circuit 90 is electrically connected to the cathode of the OLED.
The non-emission period may include a first non-emission period (e.g., a reset period) and a second non-emission period (e.g., a threshold voltage compensation period and a data voltage writing period) between the first non-emission period and the emission period.
In the first non-light emission stage, the second switch circuit 60 and the third switch circuit 70 are turned off, and the fifth switch circuit 90 is turned on, so that the positive and negative charges remaining in the last light emission stage in the light emission control circuit 40 are neutralized; thus, in the second non-emitting period, the second switch circuit 60 and the third switch circuit 70 are turned on, the fifth switch circuit 90 is turned off, and the first power supply VDD and the second power supply VSS can apply less charges when the OLED is applied with a reverse bias voltage to consume excess electrons and holes in the OLED, thereby reducing power consumption of the OLED.
It will be appreciated that during the light-up phase, the fifth switching circuit 90 is turned off.
In another embodiment of the present application, the light emission control circuit 40 may further include a sixth switching circuit 402 and a seventh switching circuit 403.
The sixth switching circuit 402 is connected between the first switching circuit 50 and the input terminal of the driving thin film transistor 401, and the seventh switching circuit 403 is connected between the output terminal of the driving thin film transistor 401 and the anode of the OLED.
The sixth switching circuit 402 and the seventh switching circuit 403 are turned off when the fifth switching circuit 90 is turned on and turned on when the fifth switching circuit 90 is turned off, so that the driving thin film transistor 401 can be isolated when the positive and negative charges remaining in the light emission control circuit 40 at the previous light emission stage are neutralized in the first non-light emission stage, thereby reducing the influence of the positive and negative charges neutralization in the light emission control circuit 40 on the driving thin film transistor 401.
Fig. 2 is a schematic circuit structure diagram of the pixel driving circuit in fig. 1, and as shown in fig. 2, the first switch circuit 50 may include a first switch tube T1, a first pole of the first switch tube T1 is electrically connected to the first power VDD, a second pole of the first switch tube T1 is electrically connected to the input end of the light-emitting control circuit 40, and a control pole of the first switch tube T1 is electrically connected to the output end of the first Scan line Scan 1.
The fourth switching circuit 80 may include a fourth switching tube T4, a first electrode of the fourth switching tube T4 is electrically connected to the second power source VSS, a second electrode of the fourth switching tube T4 is electrically connected to the cathode of the OLED, and a control electrode of the fourth switching tube T4 is electrically connected to the output terminal of the first Scan line Scan 1.
The first switch transistor T1 and the fourth switch transistor T4 may be PMOS transistors or NMOS transistors. When the first switch tube T1 and the fourth switch tube T4 are PMOS tubes, the first poles of the first switch tube T1 and the fourth switch tube T4 are source electrodes, the second pole is a drain electrode, and the control electrode is a gate electrode; when the first switch tube T1 and the fourth switch tube T4 are NMOS tubes, the first electrode of the first switch tube T1 and the fourth switch tube T4 is a drain electrode, the second electrode is a source electrode, and the control electrode is a gate electrode. In the embodiment, the first switch transistor T1 and the fourth switch transistor T4 are PMOS transistors for example, and are exemplarily described later.
In a first non-light-emitting stage and a second non-light-emitting stage, the first Scan line Scan1 outputs a high potential signal, and the first switching tube T1 and the fourth switching tube T4 are turned off; in the light emitting stage, the first Scan line Scan1 outputs a low potential signal, and the first switch transistor T1 and the fourth switch transistor T4 are turned on.
The second switching circuit 60 may include a second switching tube T2, a first pole of the second switching tube T2 being electrically connected to the second power source VSS, a second pole of the second switching tube T2 being electrically connected to the input terminal of the light emission control circuit 40, and a control pole of the second switching tube T2 being electrically connected to the output terminal of the second Scan line Scan 2.
The third switching circuit 70 may include a third switching tube T3, a first pole of the third switching tube T3 is electrically connected to the first power source VDD, a second pole of the third switching tube T3 is electrically connected to the cathode of the OLED, and a control pole of the third switching tube T3 is electrically connected to the output terminal of the second Scan line Scan 2.
The second switching tube T2 and the third switching tube T3 may be PMOS tubes or NMOS tubes. When the second switching tube T2 and the third switching tube T3 are PMOS tubes, the first electrodes of the second switching tube T2 and the third switching tube T3 are source electrodes, the second electrode is a drain electrode, and the control electrode is a gate electrode; when the second switch tube T2 and the third switch tube T3 are NMOS tubes, the first poles of the second switch tube T2 and the third switch tube T3 are drain electrodes, the second poles are source electrodes, and the control electrodes are gate electrodes. In the following description of the present embodiment, the second switching transistor T2 and the third switching transistor T3 are PMOS transistors for example.
In the first non-light-emitting stage, the second Scan line Scan2 outputs a high-potential signal, and the second switching tube T2 and the third switching tube T3 are turned off; in a second non-light-emitting stage, the second Scan line Scan2 outputs a low-potential signal, and the second switching tube T2 and the third switching tube T3 are turned on; in the light emitting stage, the second Scan line Scan2 outputs a high potential signal, and the second switching transistor T2 and the third switching transistor T3 are turned off.
The fifth switching circuit 90 may include a fifth switching tube T5, a first pole of the fifth switching tube T5 is electrically connected to the input terminal of the light emitting control circuit 40, a second pole of the fifth switching tube T5 is electrically connected to the cathode of the OLED, and a control pole of the fifth switching tube T5 is electrically connected to the output terminal of the third Scan line Scan 3.
The fifth switch transistor T5 may be a PMOS transistor or an NMOS transistor. When the fifth switch tube T5 is a PMOS tube, the first pole of the fifth switch tube T5 is a source electrode, the second pole is a drain electrode, and the control electrode is a gate electrode; when the fifth switch transistor T5 is an NMOS transistor, the first electrode of the fifth switch transistor T5 is a drain electrode, the second electrode is a source electrode, and the control electrode is a gate electrode. In the embodiment, the fifth switch transistor T5 is taken as a PMOS transistor for example, and an exemplary description is given.
In the first non-light-emitting stage, the third Scan line Scan3 outputs a low-potential signal, and the fifth switch tube T5 is turned on; in the second non-light-emitting stage and the light-emitting stage, the third Scan line Scan3 outputs a high-potential signal, and the fifth switching transistor T5 is turned off.
The sixth switching circuit 402 may include a sixth switching tube T6, a first pole of the sixth switching tube T6 is electrically connected to the second pole of the first switching tube T1, a second pole of the sixth switching tube T6 is electrically connected to the first pole of the driving thin film transistor T9, and a control pole of the sixth switching tube T6 is electrically connected to the output terminal of the fourth Scan line Scan 4.
The seventh switching circuit 403 may include a seventh switching tube T7, a first pole of the seventh switching tube T7 is electrically connected to the second pole of the driving thin film transistor T9, a second pole of the seventh switching tube T7 is electrically connected to the anode of the OLED, and a control pole of the seventh switching tube T7 is electrically connected to the output terminal of the fourth Scan line Scan 4.
The sixth switching tube T6 and the seventh switching tube T7 may be PMOS tubes or NMOS tubes. When the sixth switch tube T6 and the seventh switch tube T7 are PMOS tubes, the first electrodes of the sixth switch tube T6 and the seventh switch tube T7 are source electrodes, the second electrodes are drain electrodes, and the control electrode is a gate electrode; when the sixth switch transistor T6 and the seventh switch transistor T7 are NMOS transistors, the first electrodes of the sixth switch transistor T6 and the seventh switch transistor T7 are drain electrodes, the second electrodes are source electrodes, and the control electrode is a gate electrode. In the embodiment, the sixth switching tube T6 and the seventh switching tube T7 are PMOS tubes as an example, and an exemplary description is given.
In the first non-light-emitting stage, the fourth Scan line Scan4 outputs a high-potential signal, and the sixth switching tube T6 and the seventh switching tube T7 are turned off; in the second non-light-emitting period and the light-emitting period, the fourth Scan line Scan4 outputs a low-potential signal, and the sixth switching transistor T6 and the seventh switching transistor T7 are turned on.
The Data input circuit 10 may include an eighth switch T8, a first pole of the eighth switch T8 is electrically connected to the Data line Data, a second pole of the eighth switch T8 is electrically connected to the control pole of the driving thin film transistor T9 through the driving control circuit 20, and a control pole of the eighth switch T8 is electrically connected to the fifth Scan line Scan 5.
The eighth switch transistor T8 may be a PMOS transistor or an NMOS transistor. When the eighth switch transistor T8 is a PMOS transistor, the first electrode of the eighth switch transistor T8 is a source electrode, the second electrode is a drain electrode, and the control electrode is a gate electrode; when the eighth switch transistor T8 is an NMOS transistor, the first electrode of the eighth switch transistor T8 is a drain electrode, the second electrode is a source electrode, and the control electrode is a gate electrode. In the following description, the eighth switch transistor T8 is taken as a PMOS transistor for example.
In the first non-light emitting stage, the fifth scanning line Scan5 outputs a high potential signal, and the eighth switching tube T8 is turned off; in the second non-light-emitting stage, the fifth Scan line Scan5 outputs a low-potential signal, and the eighth switch transistor T8 is turned on; in the light emitting stage, the fifth Scan line Scan5 outputs a high potential signal, and the eighth switch transistor T8 is turned off.
The tank circuit 30 may include a capacitor C1, one end of the capacitor C1 is electrically connected to the control electrode of the driving thin film transistor T9, and the other end of the capacitor C1 is electrically connected to the first electrode of the driving thin film transistor T9.
Fig. 3 is an operation timing diagram of the pixel driving circuit according to the embodiment of the present application, as shown in fig. 3, in the first non-light emitting stage, the first Scan line Scan1, the second Scan line Scan2, the fourth Scan line Scan4, and the fifth Scan line Scan5 output high potential signals, the third Scan line Scan3 outputs low potential signals, the fifth switching tube T5 is turned on, the driving thin film transistor T9 and other switching tubes are all turned off, and the light emitting control circuit 40 neutralizes the positive and negative charges remaining in the previous light emitting stage.
In a second non-light-emitting stage, the first Scan line Scan1 and the third Scan line Scan3 output high-potential signals, and the first switch tube T1, the fourth switch tube T4 and the fifth switch tube T5 are turned off; the second Scan line Scan2, the fourth Scan line Scan4 and the fifth Scan line Scan5 output low potential signals, the second switch transistor T2, the third switch transistor T3, the sixth switch transistor T6, the seventh switch transistor T7, the eighth switch transistor T8 and the driving thin film transistor T9 are turned on, and the first power supply VDD and the second power supply VSS apply a reverse bias voltage to the OLED to consume redundant electrons and holes in the OLED.
In the light emitting stage, the first Scan line Scan1 and the fourth Scan line Scan4 output low potential signals, and the first switch tube T1, the fourth switch tube T4, the sixth switch tube T6, the seventh switch tube T7 and the driving thin film transistor T9 are turned on; the second Scan line Scan2, the third Scan line Scan3 and the fifth Scan line output high potential signals, the second switch tube T2, the third switch tube T3, the fifth switch tube T5 and the eighth switch tube T8 are turned off, the first power supply VDD and the second power supply VSS apply a forward bias to the OLED, and the OLED emits light.
It is to be understood that the circuit blocks illustrated in the embodiments of the present application do not constitute specific limitations on the pixel driving circuit. In other embodiments of the present application, the pixel driving circuit may include more or fewer circuit blocks than shown, or combine some circuit blocks, or split some circuit blocks; each circuit block may include more or fewer devices than those shown. The illustrated circuit blocks may be implemented in hardware, software, or a combination of software and hardware.
The pixel driving circuit and the display panel provided by the embodiment of the application comprise a data input circuit, an energy storage circuit, a light-emitting control circuit, a first switch circuit, a second switch circuit, a third switch circuit and a fourth switch circuit; the data input circuit is electrically connected with the control end of the light-emitting control circuit and is used for outputting data voltage to the light-emitting control circuit; one end of the energy storage circuit is electrically connected with the control end of the light-emitting control circuit, the other end of the energy storage circuit is electrically connected with the input end of the light-emitting control circuit, and the energy storage circuit is used for storing electric energy; the input end of the light-emitting control circuit is electrically connected with a first power supply through a first switch circuit and is electrically connected with a second power supply through a second switch circuit, the output end of the light-emitting control circuit is electrically connected with the anode of the light-emitting device, the light-emitting control circuit is used for outputting driving current to the light-emitting device in a light-emitting stage, the cathode of the light-emitting device is electrically connected with the first power supply through a third switch circuit and is electrically connected with the second power supply through a fourth switch circuit, the first power supply outputs high potential voltage, and the second power supply outputs low potential voltage; the second switching circuit and the third switching circuit are switched on in at least part of the non-light-emitting stage and switched off in the light-emitting stage; the first switch circuit and the fourth switch circuit are turned on in a light-emitting period and turned off in a non-light-emitting period. In the above technical solution, in at least a part of non-light emitting period, the second switch circuit and the third switch circuit are turned on, the first power supply and the second power supply apply a reverse bias to the light emitting device to consume redundant electrons and holes in the light emitting device, and in the light emitting period, the first switch circuit and the fourth switch circuit are turned on, the first power supply and the second power supply apply a forward bias to the light emitting device, and the light emitting device emits light.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The naming or numbering of the steps appearing in the present application does not mean that the steps in the method flow have to be executed in the chronological/logical order indicated by the naming or numbering, and the named or numbered process steps may be executed in a modified order depending on the technical purpose to be achieved, as long as the same or similar technical effects are achieved.
In the description of the present application, a "/" indicates a relationship in which the objects associated before and after are an "or", for example, a/B may indicate a or B; in the present application, "and/or" is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural.
Also, in the description of the present application, "a plurality" means two or more than two unless otherwise specified. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, described with reference to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A pixel driving circuit, comprising: the light-emitting control circuit comprises a data input circuit, an energy storage circuit, a light-emitting control circuit, a first switch circuit, a second switch circuit, a third switch circuit and a fourth switch circuit;
the data input circuit is electrically connected with the control end of the light-emitting control circuit and is used for outputting data voltage to the light-emitting control circuit;
one end of the energy storage circuit is electrically connected with the control end of the light-emitting control circuit, the other end of the energy storage circuit is electrically connected with the input end of the light-emitting control circuit, and the energy storage circuit is used for storing electric energy;
the input end of the light-emitting control circuit is electrically connected with a first power supply through the first switch circuit and is electrically connected with a second power supply through the second switch circuit, the output end of the light-emitting control circuit is electrically connected with the anode of a light-emitting device, the light-emitting control circuit is used for outputting driving current to the light-emitting device in a light-emitting stage, the cathode of the light-emitting device is electrically connected with the first power supply through the third switch circuit and is electrically connected with the second power supply through the fourth switch circuit, the first power supply outputs high potential voltage, and the second power supply outputs low potential voltage;
the second switch circuit and the third switch circuit are switched on in at least part of the non-light-emitting period and switched off in the light-emitting period; the first switch circuit and the fourth switch circuit are turned on in the light-emitting period and turned off in the non-light-emitting period.
2. The pixel driving circuit according to claim 1, wherein the first switching circuit comprises a first switching tube, and the fourth switching circuit comprises a fourth switching tube;
a first pole of the first switch tube is electrically connected with the first power supply, a second pole of the first switch tube is electrically connected with the input end of the light-emitting control circuit, and a control pole of the first switch tube is electrically connected with the output end of the first scanning line;
and a first pole of the fourth switching tube is electrically connected with the second power supply, a second pole of the fourth switching tube is electrically connected with a cathode of the light-emitting device, and a control pole of the fourth switching tube is electrically connected with an output end of the first scanning line.
3. The pixel driving circuit according to claim 2, wherein the first switching tube and the fourth switching tube are both PMOS tubes; the first scanning line outputs a low potential signal in the light-emitting stage and outputs a high potential signal in the non-light-emitting stage.
4. The pixel driving circuit according to claim 1, wherein the second switching circuit comprises a second switching tube, and the third switching circuit comprises a third switching tube;
a first pole of the second switch tube is electrically connected with the second power supply, a second pole of the second switch tube is electrically connected with the input end of the light-emitting control circuit, and a control pole of the second switch tube is electrically connected with the output end of the second scanning line;
the first pole of the third switching tube is electrically connected with the first power supply, the second pole of the third switching tube is electrically connected with the cathode of the light-emitting device, and the control pole of the third switching tube is electrically connected with the output end of the second scanning line.
5. The pixel driving circuit according to claim 4, wherein the second switching tube and the third switching tube are both PMOS tubes; the second scanning line outputs a high potential signal in the light-emitting stage and outputs a low potential signal in at least part of the non-light-emitting stage.
6. The pixel driving circuit according to any one of claims 1 to 5, further comprising: one end of the fifth switch circuit is electrically connected with the input end of the light-emitting control circuit, and the other end of the fifth switch circuit is electrically connected with the cathode of the light-emitting device;
the non-lighting phase comprises a first non-lighting phase and a second non-lighting phase, and the second non-lighting phase is positioned between the first non-lighting phase and the lighting phase;
the fifth switch circuit is turned on in the first non-light-emitting period and turned off in the second non-light-emitting period and the light-emitting period;
the second switch circuit and the third switch circuit are turned on in the second non-emission period and turned off in the first non-emission period and the emission period.
7. The pixel driving circuit according to claim 6, wherein the fifth switching circuit comprises a fifth switching tube, a first pole of the fifth switching tube is electrically connected to the input terminal of the light emission control circuit, a second pole of the fifth switching tube is electrically connected to the cathode of the light emitting device, and a control pole of the fifth switching tube is electrically connected to the output terminal of the third scan line.
8. The pixel driving circuit according to claim 7, wherein the fifth switching transistor is a PMOS transistor; the third scanning line outputs a low potential signal in the first non-light-emission period, and outputs a high potential signal in the second non-light-emission period and the light-emission period.
9. The pixel driving circuit according to claim 6, wherein the light emission control circuit comprises a sixth switching circuit, a seventh switching circuit, and a driving thin film transistor;
the sixth switching circuit is connected between the first switching circuit and the input end of the driving thin film transistor, and the seventh switching circuit is connected between the output end of the driving thin film transistor and the anode of the light emitting device;
the sixth switching circuit and the seventh switching circuit are turned off when the fifth switching circuit is turned on, and are turned on when the fifth switching circuit is turned off.
10. A display panel comprising a plurality of pixel cells, each of said pixel cells comprising a light emitting device and a pixel drive circuit according to any one of claims 1 to 9.
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| CN202211316055.4A CN115482786B (en) | 2022-10-26 | 2022-10-26 | Pixel driving circuit and display panel |
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| CN202211316055.4A CN115482786B (en) | 2022-10-26 | 2022-10-26 | Pixel driving circuit and display panel |
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| CN115482786B (en) | 2023-07-07 |
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