CN115410530A - Pixel compensation circuit, driving method and display panel - Google Patents
Pixel compensation circuit, driving method and display panel Download PDFInfo
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- CN115410530A CN115410530A CN202211048151.5A CN202211048151A CN115410530A CN 115410530 A CN115410530 A CN 115410530A CN 202211048151 A CN202211048151 A CN 202211048151A CN 115410530 A CN115410530 A CN 115410530A
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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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Abstract
The application discloses a pixel compensation circuit, a driving method and a display panel, wherein the pixel compensation circuit comprises a plurality of switches, a storage capacitor is arranged between a first driving switch and a second switch, a preset voltage is connected to a control end of the first driving switch through a third switch, the access point of a pixel unit is charged and reset, the preset voltage of the control end of the first driving switch is discharged through a fourth switch and a fifth driving switch, the potential of the capacitor is pulled down through a sixth switch, the threshold voltage of the control end of the first driving switch and the voltages at two ends of the storage capacitor are locked, and the second switch is conducted to input data voltage to the access point of the pixel unit and a light-emitting element to enter a light-emitting stage. The pixel compensation circuit provided by the application compensates the threshold voltage of the first drive switch, and avoids the problem of uneven brightness caused by different threshold voltages due to temperature rise.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a pixel compensation circuit, a driving method and a display panel.
Background
In recent years, organic Light-Emitting Diode (OLED) displays have the characteristics of self-luminescence, wide viewing angle, short reaction time, high luminous efficiency, wide color gamut, low operating voltage, thin thickness, capability of manufacturing large-size and flexible displays, simple manufacturing process and the like, and become very popular new flat display products at home and abroad.
In an OLED display, a transistor (TFT) is usually used to store a signal in combination with a capacitor to control the brightness gray scale of the OLED. For the purpose of constant current driving, each pixel needs at least two TFTs and one storage capacitor to be formed, namely, 2T1C mode; due to the limitations of the crystallization process, the low temperature polysilicon thin film transistors fabricated on large area glass substrates often have non-uniformity in electrical parameters such as threshold voltage, mobility, etc. After the light-emitting element emits light for a long time, the temperature of the device rises, the working time of the TFTs in different areas is different, the temperature is different, the threshold voltage Vth is different, and the problem of uneven brightness is caused.
Disclosure of Invention
The present application provides a pixel compensation circuit, a driving method and a display panel, which can avoid brightness unevenness caused by different threshold voltages of driving switches after the temperature of a light emitting element rises.
The application discloses a pixel compensation circuit, which comprises a light-emitting element connected between a first power supply and a second power supply, and further comprises a first driving switch, a second switch, a storage capacitor, a third switch, a fourth switch, a fifth driving switch and a sixth switch; the input end of the first driving switch is connected with the first power supply, and the output end of the first driving switch is connected with the light-emitting element; the control end of the second switch is connected with a scanning line, and the input end of the second switch is connected with a data line; the storage capacitor is positioned between the control end of the first driving switch and the output end of the second switch; the control end of the third switch is connected with a scanning line, the input end of the third switch is connected with the preset voltage input end, and the output end of the third switch is connected with the control end of the first driving switch; the control end of the fourth switch is connected with a scanning line, and the input end of the fourth switch is connected with the control end of the first driving switch; the control end and the input end of the fifth driving switch are connected with the output end of the fourth switch, and the output end of the fifth driving switch is connected with a low level input end; the control end of the sixth switch is connected with a scanning line, the input end of the sixth switch is connected between the second switch and the storage capacitor, and the output end of the sixth switch is connected with a low-level input end; the preset voltage input end outputs a preset voltage to the control end of the first driving switch through the third switch, and the scanning line provides a first scanning signal, a second scanning signal and a third scanning signal; the control end of the third switch and the control end of the sixth switch receive the first scanning signal, the control end of the fourth switch receives the second scanning signal, and the control end of the second switch receives the third scanning signal.
Optionally, the first driving switch and the fifth driving switch are driving transistors with the same channel width-to-length ratio, and the second switch, the third switch, the fourth switch and the sixth switch are all MOS transistors; the light emitting element is an organic light emitting diode.
Optionally, the pixel compensation circuit further includes a seventh switch, a control end of the seventh switch is connected to a control signal, an input end of the seventh switch is connected to the output end of the first driving switch, an output end of the seventh switch is connected to an anode of the light emitting element, and the light emitting element is controlled by the first control signal to turn on the seventh switch to emit light.
Optionally, the preset voltage input end is connected to the first power supply.
The present application also discloses a driving method for driving the pixel compensation circuit as described in any of the above, comprising:
in a first time period, controlling the third switch and the sixth switch to be turned on, and the second switch, the fourth switch and the fifth driving switch to be turned off, so that the light-emitting element stops emitting light; the voltage of the control end of the first driving switch is reset through the third switch;
controlling the fourth switch and the fifth driving switch to be turned on in a second time period; the second switch, the third switch, and the sixth switch are closed; the control end of the first driving switch discharges through the fourth switch and the fifth driving switch until the control end of the first driving switch discharges to the threshold voltage of the fifth driving switch;
controlling the second switch to be opened in a third time period; the third switch, the fourth switch, the fifth drive switch, and the sixth switch are closed; the data voltage is written into the control end of the first driving switch through the second switch;
controlling the second switch, the third switch, the fourth switch, the fifth driving switch and the sixth switch to be turned off during a fourth time period;
the voltage of the storage capacitor is stable, the first driving switch is turned on, a path is formed between the first power supply and the second power supply, and current flows through the light-emitting element to enable the light-emitting element to emit light.
Optionally, the voltage value of the preset voltage is greater than the threshold voltage of the first driving switch and less than or equal to the voltage value provided by the first power supply.
Optionally, the second switch, the third switch, the fourth switch and the sixth switch are all N-MOS transistors; in the first time period, the first scan signal inputs a high level, and the second scan signal and the third scan signal input a low level;
in the second period, the second scan signal is input with a high level, and the first scan signal and the third scan signal are input with a low level;
in the third time period, the third scan signal is input with a high level, and the first scan signal and the second scan signal are input with a low level;
in the fourth period, the first scan signal, the second scan signal, and the third scan signal input a low level.
Optionally, the pixel compensation circuit further includes a seventh switch, where the seventh switch is an N-MOS transistor, a control end of the seventh switch is connected to a control signal, the control signal is at a low level from a start time of the first time period to an end time of the third time period, and the control signal is at a high level from a start time of the fourth time period to the end time of the fourth time period.
Optionally, the first time period, the second time period, and the third time period are equal in duration; the duration of the fourth time period is greater than the sum of the durations of the first, second and third time periods.
The application also discloses a display panel which comprises a plurality of pixel compensation circuits.
For the scheme that no compensation circuit is arranged in the pixel unit, the pixel compensation circuit can realize threshold voltage compensation only by three scanning lines, a preset voltage is connected to the first scanning line in an initialization stage to realize voltage resetting of the control end of the first driving switch, the hysteresis characteristic of a TFT is improved, the problem of image sticking can be avoided, the threshold voltage value of the first driving switch is locked by discharging of the fourth driving switch and the fifth driving switch and is stored in the storage capacitor, and then the influence of other currents is avoided in a data voltage input stage and is only related to data voltage, so that the compensation of the threshold voltage of the first driving switch is realized, and the problem of uneven brightness caused by different threshold voltages of the first driving switch due to the fact that a light-emitting element is at high temperature for a long time is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of a pixel compensation circuit in a first embodiment of the present application;
fig. 2 is a waveform diagram of a driving signal of a pixel compensation circuit in the first embodiment of the present application;
FIG. 3 is a schematic diagram of a pixel compensation circuit in a second embodiment of the present application;
FIG. 4 is a schematic diagram of a pixel compensation circuit in a third embodiment of the present application;
fig. 5 is a waveform diagram of a driving signal of a pixel compensation circuit in a third embodiment of the present application;
fig. 6 is a schematic diagram of a pixel compensation circuit in a fourth embodiment of the present application.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless stated otherwise, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
The present application is described in detail below with reference to the figures and alternative embodiments.
As shown in fig. 1, as a first embodiment of the present application, a pixel compensation circuit is disclosed, which is connected to a Light Emitting element between a first power source and a second power source, wherein the Light Emitting element is an Organic Light-Emitting Diode (OLED); the first power supply is a positive power supply Vdd of the light emitting element, and the second power supply is a negative power supply Vss of the light emitting element.
The pixel compensation circuit comprises a first driving switch T1, a second switch T2, a storage capacitor C, a third switch T3, a fourth switch T4, a fifth driving switch T5 and a sixth switch T6; the first driving switch T1 is electrically connected to the light emitting element OLED; the second switch T2 is electrically connected to the Scan line and the Data line Data, and the Scan line provides a first Scan signal Scan1, a second Scan signal Scan2, and a third Scan signal Scan3; the storage capacitor C is positioned between the first driving switch T1 and the second driving switch T2; each TFT switch comprises a control end, an input end and an output end, wherein the control end is a grid electrode, the input end is a source electrode, and the output end is a drain electrode; when the voltage received by the control end, the input end and the output end meets the opening condition of the TFT switch, the source electrode and the drain electrode are connected through the semiconductor layer, and the TFT switch is in an opening state at the moment, otherwise, the TFT switch is in a closing state.
Specifically, the control end of the first driving switch T1 is connected to the first end of the storage capacitor C, the output end of the third switch T3, and the input end of the fourth switch T4; the input end of the first driving switch T1 is connected with the first power supply Vdd; the output end of the first driving switch T1 is connected with the anode of the light-emitting element OLED; a control end of the second switch T2 is connected to the third Scan signal Scan3, an input end of the second switch T2 is connected to the data line, an output end of the second switch T2 is connected to the second end of the storage capacitor C, and an input end of the sixth switch T6.
The control end of the third switch T3 is connected to the first Scan signal Scan1, and the input end of the third switch T3 is connected to the preset voltage Vref; a control end of the fourth switch T4 is connected to the second Scan signal Scan2, a control end of the fifth driving switch T5 is connected to an output end of the fourth switch T4 and an input end of the fifth driving switch T5, and an output end of the fifth driving switch T5 is grounded; a control end of the sixth switch T6 is connected to the first Scan signal Scan1, and an output end of the sixth switch T6 is grounded.
Generally, in the consecutive first, second, third and fourth periods, the access point of the pixel unit is charged and reset sequentially, the threshold voltage Vth of the control terminal of the first driving switch T1 and the voltage across the storage capacitor C are locked, and the data voltage is input to the access point of the pixel unit and the light emitting device OLED enters the light emitting phase.
The driving current of the in-pixel compensation circuit is only related to the data voltage Vdata, the voltage of the first power supply and the voltage of the second power supply are compensated, the picture unevenness caused by voltage drop is avoided, the threshold voltage Vth of the light-emitting element can drift after long-time work, and the better picture display effect is favorably realized; the storage capacitor C has the functions of a coupling capacitor and a storage capacitor, reduces the number of elements of a compensation circuit in a pixel, and provides possibility for a self-luminous display device with higher PPI.
Further, the first driving switch T1 and the fifth driving switch T5 are driving transistors with the same channel width-to-length ratio, and the second switch T2, the third switch T3, the fourth switch T4 and the sixth switch T6 are MOS transistors; the light emitting device is an organic light emitting diode, and as shown in fig. 2, is a waveform diagram of a driving signal of a pixel compensation circuit in a first embodiment of the present application; the corresponding driving method is as follows:
in the first period T1, the first Scan signal Scan1 is input with a high level, and the second Scan signal Scan2 and the third Scan signal Scan3 are input with a low level; wherein the third switch T3 and the sixth switch T6 are turned on, the second switch T2, the fourth switch T4 and the fifth driving switch T5 are turned off, and the light emitting element OLED stops emitting light; the control terminal of the first driving switch T1 is reset by the third switch T3.
In the second period T2, the second Scan signal Scan2 is input with a high level, and the first Scan signal Scan1 and the third Scan signal Scan3 are input with a low level; wherein the fourth switch T4 and the fifth driving switch T5 are turned on; the second switch T2, the third switch T3 and the sixth switch T6 are closed; the control end of the first driving switch T1 discharges through the fourth switch T4 and the fifth driving switch T5 until the control end discharges to the threshold voltage Vth of the fifth driving switch T5, and is stored by the storage capacitor C, so that the threshold voltage Vth of the first driving switch T1 is locked.
In the third period T3, the third Scan signal Scan3 is input with a high level, and the first Scan signal Scan1 and the second Scan signal Scan2 are input with a low level; wherein the second switch T2 is open; the third switch T3, the fourth switch T4, the fifth driving switch T5, and the sixth switch T6 are turned off; the Data voltage Data is written into the access point of the pixel unit through the second switch T2.
In the fourth period T4, the first Scan signal Scan1, the second Scan signal Scan2, and the third Scan signal Scan3 are inputted with a low level; the second switch T2, the third switch T3, the fourth switch T4, the fifth driving switch T5, and the sixth switch T6 are turned off; the voltage of the storage capacitor C is stable, the first driving switch T1 is turned on, a path is formed between the first power supply Vdd and the second power supply Vss, and a current flows through the light emitting element OLED to cause the light emitting element OLED to emit light.
The time lengths of the first time period, the second time period and the third time period are equal; the duration of the fourth time period is greater than the sum of the durations of the first time period, the second time period and the third time period, the duration of the fourth time period is much greater than the durations of the first time period, the second time period and the third time period, and generally, the duration of the fourth time period is the light emitting duration of one frame of the OLED.
In addition, it should be noted that the voltage value of the preset voltage Vref is greater than the threshold voltage Vth of the first driving switch T1 and is less than or equal to the voltage value provided by the first power Vdd, where the preset voltage may be set according to the influence of the temperature generated in the working process of the light emitting element on the threshold voltage of the first driving switch T1, and the preset voltages of different pixel compensation circuits may be different; generally, the threshold voltages Vth of the first driving switch T1 and the fifth driving switch T5 are equal, and when the TFT of the pixel compensation circuit is manufactured, the manufacturing parameters of the first driving switch T1 and the fifth driving switch T5 are the same.
As shown in fig. 3, as a second embodiment of the present application, different from the above embodiments, the input terminal of the third switch T3 is connected to the first power supply Vdd, and receives the voltage Vdd output by the first power supply Vdd to reset the voltage of the control terminal of the first driving switch T1; in a first time period, scan1 is at a high level, the third switch T3 is turned on, and the point G is charged to Vdd; in the second period, scan2 is at high level, the fourth switch T4 and the fifth driving switch T5 are turned on, and the G-point voltage is discharged to Vth (Vth is the threshold voltage of T5).
As shown in fig. 4, as a third embodiment of the present application, different from the first embodiment, a seventh switch T7 is further provided between the first driving switch T1 and the second power supply Vss, a control end of the seventh switch T7 is connected to a control signal Emit, an input end of the seventh switch T7 is connected to an output end of the first driving switch T1, an output end of the seventh switch T7 is connected to an anode of the light emitting element OLED, and the light emitting element OLED is controlled by the control signal Emit to be turned on by the seventh switch T7 to Emit light.
The seventh switch T7 is an N-MOS transistor, a control end of the seventh switch T7 is connected to a control signal Emit, the control signal Emit is at a low level from a start time of the first time period T1 to an end time of the third time period T3, and the control signal Emit is at a high level from a start time of the fourth time period T4 to the end time of the fourth time period T4; fig. 5 is a waveform diagram of a driving signal of a pixel compensation circuit in a third embodiment of the present application; the corresponding driving method is as follows:
in the first period T1, the first Scan signal Scan1 is input with a high level, and the second Scan signal Scan2 and the third Scan signal Scan3 are input with a low level; the third switch T3 and the sixth switch T6 are turned on, the second switch T2, the fourth switch T4, the fifth driving switch T5, and the seventh switch T7 are turned off, and the light emitting element OLED stops emitting light; the control end of the first driving switch T1 is reset through the third switch T3;
in the second period T2, the second Scan signal Scan2 is input with a high level, and the first Scan signal Scan1 and the third Scan signal Scan3 are input with a low level; the fourth switch T4 and the fifth driving switch T5 are turned on; the second switch T2, the third switch T3, the sixth switch T6, and the seventh switch T7 are turned off; the control end of the first driving switch T1 discharges through the fourth switch T4 and the fifth driving switch T5 until the control end discharges to the threshold voltage Vth of the fifth driving switch T5, and is stored by the storage capacitor C, so as to lock the threshold voltage Vth of the first driving switch T1;
in the third period T3, the third Scan signal Scan3 is input with a high level, and the first Scan signal Scan1 and the second Scan signal Scan2 are input with a low level; the second switch T2 is open; the third switch T3, the fourth switch T4, the fifth driving switch T5, the sixth switch T6, and the seventh switch T7 are turned off; the data voltage is written into an access point of the pixel unit through the second switch T2;
in the fourth period T4, the first Scan signal Scan1, the second Scan signal Scan2, and the third Scan signal Scan3 are inputted with a low level; the second switch T2, the third switch T3, the fourth switch T4, the fifth driving switch T5, the sixth switch T6, and the seventh switch T7 are turned off; the voltage of the storage capacitor C is stable, the first driving switch T1 is turned on, a path is formed between the first power supply Vdd and the second power supply Vss, and a current flows through the light emitting element OLED to cause the light emitting element OLED to emit light.
As shown in fig. 6, as a fourth embodiment of the present application, different from the third embodiment, the input terminal of the third switch T3 is connected to the first power supply Vdd, and receives the voltage Vdd outputted by the first power supply Vdd, so as to reset the voltage of the control terminal of the first driving switch T1; in a first time period, scan1 is at a high level, the third switch T3 is turned on, and the point G is charged to Vdd; in the second period, scan2 is at high level, the fourth switch T4 and the fifth driving switch T5 are turned on, and the G-point voltage is discharged to Vth (Vth is the threshold voltage of T5).
As another embodiment of the present application, a display panel is disclosed, which is an OLED (Organic Light-Emitting Diode) display panel, and includes a plurality of pixel compensation circuits as described in any of the above embodiments; wherein the threshold voltage of the first driving switch of each pixel compensation circuit can be equal or unequal; and selecting a proper preset voltage according to the change of the threshold voltage caused by the change of the temperature of the light-emitting element so as to compensate the threshold voltage of the first driving switch, thereby ensuring the compensation effect of the pixel compensation circuit in each pixel unit in the whole display panel and realizing the homogenization of the whole display panel.
It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced
The foregoing is a further detailed description of the present application in connection with specific alternative embodiments and it is not intended that the present application be limited to these specific details. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A pixel compensation circuit comprising a light emitting element connected between a first power supply and a second power supply, the pixel compensation circuit further comprising:
the input end of the first driving switch is connected with the first power supply, and the output end of the first driving switch is connected with the light-emitting element;
the control end of the second switch is connected with a scanning line, and the input end of the second switch is connected with the data line;
the storage capacitor is positioned between the control end of the first driving switch and the output end of the second switch;
the control end of the third switch is connected with a scanning line, the input end of the third switch is connected with the preset voltage input end, and the output end of the third switch is connected with the control end of the first driving switch;
a control end of the fourth switch is connected with a scanning line, and an input end of the fourth switch is connected with a control end of the first driving switch;
a control end and an input end of the fifth driving switch are connected with an output end of the fourth switch, and an output end of the fifth driving switch is connected with a low level input end; and
a control end of the sixth switch is connected with a scanning line, an input end of the sixth switch is connected between the second switch and the storage capacitor, and an output end of the sixth switch is connected with a low level input end;
the preset voltage input end outputs a preset voltage to the control end of the first driving switch through the third switch, and the scanning line provides a first scanning signal, a second scanning signal and a third scanning signal; the control end of the third switch and the control end of the sixth switch receive the first scanning signal, the control end of the fourth switch receives the second scanning signal, and the control end of the second switch receives the third scanning signal.
2. The pixel compensation circuit of claim 1, wherein the first driving switch and the fifth driving switch are driving transistors with the same channel width-length ratio, and the second switch, the third switch, the fourth switch and the sixth switch are all MOS transistors; the light emitting element is an organic light emitting diode.
3. The pixel compensation circuit of claim 1, further comprising a seventh switch, wherein a control terminal of the seventh switch is connected to a control signal, an input terminal of the seventh switch is connected to the output terminal of the first driving switch, an output terminal of the seventh switch is connected to an anode of the light emitting element, and the light emitting element is controlled by the first control signal to turn on the seventh switch for emitting light.
4. The pixel compensation circuit of claim 1, wherein the predetermined voltage input is coupled to the first power supply.
5. A driving method for driving the pixel compensation circuit according to any one of claims 1 to 4, comprising:
in a first time period, controlling the third switch and the sixth switch to be turned on, and the second switch, the fourth switch and the fifth driving switch to be turned off, so that the light-emitting element stops emitting light; the voltage of the control end of the first driving switch is reset through the third switch;
controlling the fourth switch and the fifth driving switch to be turned on in a second time period; the second switch, the third switch, and the sixth switch are closed; the control end of the first driving switch discharges through the fourth switch and the fifth driving switch until the control end of the first driving switch discharges to the threshold voltage of the fifth driving switch;
controlling the second switch to be opened in a third time period; the third switch, the fourth switch, the fifth drive switch, and the sixth switch are turned off; the data voltage is written into the control end of the first driving switch through the second switch;
controlling the second switch, the third switch, the fourth switch, the fifth driving switch and the sixth switch to be turned off during a fourth time period;
the voltage of the storage capacitor is stable, the first driving switch is turned on, a path is formed between the first power supply and the second power supply, and current flows through the light-emitting element to enable the light-emitting element to emit light.
6. The driving method according to claim 5, wherein the voltage value of the preset voltage is greater than the threshold voltage of the first driving switch and equal to or less than the voltage value provided by the first power supply.
7. The driving method according to claim 5, wherein the second switch, the third switch, the fourth switch, and the sixth switch are all N-MOS transistors;
in the first time period, the first scanning signal inputs a high level, and the second scanning signal and the third scanning signal input a low level;
in the second period, the second scan signal is input with a high level, and the first scan signal and the third scan signal are input with a low level;
in the third time period, the third scan signal is input with a high level, and the first scan signal and the second scan signal are input with a low level;
during the fourth period, the first scan signal, the second scan signal, and the third scan signal input a low level.
8. The driving method according to claim 7, wherein the pixel compensation circuit further includes a seventh switch, the seventh switch is an N-MOS transistor, a control terminal of the seventh switch is connected to a control signal, the control signal is at a low level from a start time of the first period to an end time of the third period, and the control signal is at a high level from a start time of the fourth period to an end time of the fourth period.
9. The driving method according to claim 5, wherein the first period, the second period, and the third period are equal in duration; the duration of the fourth time period is greater than the sum of the durations of the first, second and third time periods.
10. A display panel comprising a plurality of pixel compensation circuits according to any one of claims 1 to 4.
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