CN112365842A - Pixel circuit, driving method thereof and display device - Google Patents
Pixel circuit, driving method thereof and display device Download PDFInfo
- Publication number
- CN112365842A CN112365842A CN202011401925.9A CN202011401925A CN112365842A CN 112365842 A CN112365842 A CN 112365842A CN 202011401925 A CN202011401925 A CN 202011401925A CN 112365842 A CN112365842 A CN 112365842A
- Authority
- CN
- China
- Prior art keywords
- voltage
- switching transistor
- transistor
- driving
- control module
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000004044 response Effects 0.000 claims description 5
- 239000000758 substrate Substances 0.000 abstract 1
- 241001270131 Agaricus moelleri Species 0.000 description 11
- 238000000605 extraction Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000012938 design process Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Images
Classifications
-
- 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]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
-
- 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]
- G09G3/3266—Details of drivers for scan electrodes
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The embodiment of the invention relates to the technical field of display, and discloses a pixel circuit, a driving method thereof and a display device, wherein the pixel circuit comprises a first control module, and when the first control module is conducted, the output end of the first control module outputs a first voltage from a first voltage source; the output end of the second control module outputs a second voltage from a second voltage source when the second control module is conducted; and the first control module transmits a first voltage to a grid electrode of the driving module when being conducted, the second control module transmits a second voltage to a source electrode of the driving module when being conducted, the grid electrode voltage of the driving module is equal to the sum of the second voltage and the threshold voltage of the driving module under the condition that the first control module and the second control module are in a preset state, and the source electrode voltage of the driving module is equal to the second voltage. The pixel driving circuit, the driving method thereof, the array substrate and the display device provided by the invention can improve the brightness uniformity of the display device.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pixel circuit, a driving method thereof and a display device.
Background
Since the Organic Light Emitting Diode (OLED) emits light by current driving, the characteristics of the TFT devices directly affect the gray scale luminance difference of the display device, and when the characteristics of the TFT devices of different sub-pixels are too different, the image quality is easily uneven. In view of the above problem, in the conventional pixel circuit, the luminance uniformity of the entire display screen can be improved by internally compensating the threshold voltage Vth of the pixel circuit. However, although the Vth can be internally compensated at different gray scales, the compensation uniformity of Vth at different gray scales is not good due to different operating voltages at different gray scales.
Disclosure of Invention
An object of embodiments of the present invention is to provide a pixel circuit, a driving method thereof, and a display device, which can improve luminance uniformity of the display device.
To solve the above technical problem, an embodiment of the present invention provides a pixel circuit including:
the first control module responds to a first scanning signal from a first scanning line to be turned on or turned off, and when the first control module is turned on, the output end of the first control module outputs a first voltage from a first voltage source; the second control module responds to a second scanning signal from a second scanning line to be turned on or off, and when the second control module is turned on, the output end of the second control module outputs a second voltage from a second voltage source; the driving module is respectively connected with the first control module and the second control module, the first control module transmits the first voltage to a grid electrode of the driving module when being conducted, the second control module transmits the second voltage to a source electrode of the driving module when being conducted, the grid electrode voltage of the driving module is equal to the sum of the second voltage and a threshold voltage of the driving module when the first control module and the second control module are in a preset state, and the source electrode voltage of the driving module is equal to the second voltage.
In addition, when the first scanning signal and the second scanning signal both have a first level, the gate of the driving module obtains the first voltage; when the first scan signal has a second level and the second scan signal has a first level, the gate voltage of the driving module is equal to the sum of the second voltage and the threshold voltage of the driving module, wherein the first level and the second level have opposite phases.
In addition, the pixel circuit further comprises a third control module, a third voltage source and a storage module; the third control module responds to a third scanning signal from a third scanning line to be switched on or switched off; the memory module stores a third voltage of the third voltage source when the second scan signal has a first level, the first scan signal and the third scan signal all have a second level; the driving module drives the light emitting device to emit light when the second scan signal has a second level and the first scan signal and the third scan signal all have a first level.
In addition, the memory module has a first node and a second node, and when the first scan signal and the second scan signal both have a first level and the third scan signal has a second level, the voltage of the first node is a first voltage and the voltage of the second node is a third voltage; when the first scanning signal and the third scanning signal both have a first level and the second scanning signal has a second level, the voltage difference between the first node and the second node is equal to: the third voltage is subtracted from the sum of the threshold voltage of the driving module and the second voltage.
Additionally, the first control module includes: a first switching transistor and a second switching transistor; the first switch transistor is connected with the first voltage source and the drain electrode of the driving module and responds to the first scanning signal to be switched on or switched off; the second switching transistor is connected with the source electrode of the driving module and the driver and is synchronously switched on or switched off with the first switching transistor; the second control module includes: a third switching transistor, a fourth switching transistor, and a fifth switching transistor; the third switching transistor is connected with the first node and the drain electrode of the driving module and responds to the second scanning signal to be turned on or turned off; the fourth switching transistor is connected with the third voltage source and the second node and is synchronously switched on or switched off with the third switching transistor; the fifth switching transistor is connected with the second voltage source and the source electrode of the driving module and is synchronously switched on or switched off with the third switching transistor; the third control module includes: a sixth switching transistor which connects the second node and the light emitting device and is turned on or off in response to the third scan signal.
In addition, at least one of the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor and the sixth switch transistor is an MOS transistor; preferably, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor and the sixth switch transistor are MOS transistors; preferably, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor and the sixth switch transistor are all NMOS transistors.
In addition, the second voltage and the third voltage are both smaller than the first voltage.
Correspondingly, an embodiment of the present invention further provides a driving method of a pixel circuit, including: in the first stage, a first scanning signal controls a first switching transistor and a second switching transistor to be in a conducting state, and a second scanning signal controls a third switching transistor, a fourth switching transistor and a fifth switching transistor to be in a conducting state; the first voltage provided by the first voltage source initializes the grid electrode of the driving module, the third voltage provided by the third voltage source initializes the second node of the storage capacitor, the second voltage provided by the second voltage source initializes the source electrode of the driving module, and the third scanning signal controls the sixth switching transistor to be in a cut-off state; in the second stage, the first scanning signal controls the first switching transistor and the second switching transistor to be changed from a conducting state to a cut-off state so as to compensate the threshold voltage of the driving module; a third stage in which the second scan signal controls the third to fifth switching transistors to be turned from an on state to an off state, the first control signal controls the first and second switching transistors to be turned from an off state to an on state, and the third control signal controls the sixth switching transistor to be turned from an off state to an on state; current flows into the light emitting diode, which emits light.
In addition, in the second phase, the voltage of the gate of the first thin film transistor is changed from the first voltage to the sum of the second voltage and the threshold voltage of the first thin film transistor.
In addition, in the third phase, the voltage of the second node of the storage capacitor is set from VDataThe voltage of the grid electrode of the driving module is changed from Vinit + Vth to Vinit + Vth + VSS + Voled-VDataThe driving current of the driving module is as follows:
Correspondingly, the embodiment of the invention also provides a display device which comprises the pixel circuit or the pixel circuit in the driving method of the pixel circuit.
Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:
in the above technical solution, in an initialization stage, a first voltage of a first voltage source initializes a gate of a driving module, and a second voltage of a second voltage source initializes a source of the driving module, so that the driving module is in a conducting state; in the compensation stage of the threshold voltage of the driving module, the connection between the gate of the driving module and the first voltage source is disconnected, and the source of the driving module is connected with the second voltage source, so that the voltage of the gate is continuously reduced until the voltage of the gate is equal to the sum of the second voltage and the threshold voltage (at this time, the voltage difference between the gate and the source of the driving module is equal to the threshold voltage, and therefore the driving module is in a cut-off state, the voltage of the gate cannot be continuously reduced), and the extraction of the threshold voltage is completed. By the method, in the compensation stage of the threshold voltage of all gray scales of the pixel circuit, the extraction of the threshold voltage is independent of the first voltage source and is unified as the extraction of the second voltage (constant value) of the second voltage source, so that the compensation uniformity of different gray scales is improved, and the brightness uniformity is improved.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
fig. 2 is a schematic circuit diagram of a pixel circuit according to another embodiment of the invention;
FIG. 3 is a timing diagram of the operation of the pixel circuit shown in FIG. 2;
fig. 4 is a flowchart of a driving method of a pixel circuit according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.
Fig. 1 is a functional block diagram of a pixel circuit according to an embodiment of the present invention. Referring to fig. 1, the pixel circuit provided in the present embodiment includes:
the control module responds to a scanning signal from a scanning line to be turned on or turned off, and when the control module is turned on, the output end of the control module outputs a voltage from a voltage source, wherein the voltage source at least comprises a first voltage source VDD and a second voltage source Vinit; the driving module 2 is connected with the control module, when the scanning signal has a first level, a gate of the driving module 2 obtains a first voltage of a first voltage source VDD, and a source of the driving module 2 obtains a second voltage of a second voltage source Vinit; when the scanning signal has the second level, the connection between the gate of the driving module 2 and the first voltage source VDD is disconnected, the source of the driving module 2 is kept connected with the second voltage source Vinit, the gate voltage of the driving module 2 is reduced to be equal to the sum of the second voltage and the threshold voltage of the driving module 2, and the phases of the first level and the second level are opposite.
In the initialization stage, a first voltage of the first voltage source VDD initializes the gate of the driving module 2, and a second voltage of the second voltage source Vinit initializes the source of the driving module 2, so that the driving module 2 is in a conducting state; in the compensation stage of the threshold voltage of the driving module 2, the connection between the gate of the driving module 2 and the first voltage source VDD is disconnected, and the source of the driving module 2 is kept connected to the second voltage source Vinit, so that the voltage of the gate is continuously reduced until the voltage of the gate is equal to the sum of the second voltage and the threshold voltage (at this time, the voltage difference between the gate and the source of the driving module 2 is equal to the threshold voltage, and therefore the driving module 2 is in a cut-off state, and the voltage of the gate is not continuously reduced), thereby completing the extraction of the threshold voltage. In this way, in the compensation stage of the threshold voltages of all gray scales of the pixel circuit, the extraction of the threshold voltages is independent of the first voltage source VDD, and the extraction of the second voltage (constant value) of the second voltage source Vinit is unified, so that the compensation uniformity of different gray scales is improved, and further the brightness uniformity is improved.
The pixel circuit provided in the present embodiment will be described in detail below.
The control module is used for determining whether to switch on or switch off based on the scanning signals of the scanning lines. In this embodiment, when the scan signal is at a high level, the control module is turned off; when the scanning signal is at a low level, the control module is conducted. In other embodiments, the control module may be turned off when the scan signal is at a low level; when the scanning signal is at a high level, the control module is conducted. It should be noted that, the high level and the low level mentioned in the embodiment are relative, and the voltage corresponding to the high level is higher than the voltage corresponding to the low level.
Specifically, the control module includes a first control module 101 and a second control module 102; the first control module 101 responds to the signal from the first scan line EM _nThe first scan signal of (a) is turned on or off, and when the first control module 101 is turned on, the output end of the first control module 101 outputs a first voltage from a first voltage source VDD; the second control module 102 is turned on or off in response to a second Scan signal from the second Scan line Scan1, and when the second control module 102 is turned on, the output terminal of the second control module 102 outputs a second voltage from the second voltage source Vinit; when the first scanning signal and the second scanning signal both have a first level, the grid of the driving module acquires a first voltage of a first voltage source VDD; when the first scan signal has the second level and the second scan signal has the first level, the gate voltage of the driving module 2 is equal to the sum of the second voltage and the threshold voltage of the driving module 2.
Further, the control module further includes a third control module 103, the voltage source further includes a third voltage source Data, and the pixel circuit further includes a storage module 3; the third control module 103 responds to the signal from the third scan line EM _n-1The third scan signal of (2) to turn on or off; when the second scan signal has the first level, the memory module 3 stores the third voltage of the third voltage source Data; the driving module 2 drives the light emitting device to emit light when the second scan signal has the second level, and the first scan signal and the third scan signal all have the first level. For example, during the period that the first level is a high level and the second level is a low level, the storage module 3 stores the third voltage, the third control module 103 is turned off, and the connection between the storage module 3 and the light emitting device is disconnected; during the period that the first level is the low level period and the second level is the high level period, the storage module 3 stops storing the voltage, the third control module 103 is turned on, the connection between the storage module 3 and the light emitting device is turned on, and the connection between the driving module 2 and the light emitting device is turned on to drive the light emitting device to emit light. Or, during the period that the first level is the low level and the second level is the high level, the storage module 3 stores the third voltage, the third control module 103 is turned off, and the connection between the storage module 3 and the light emitting device is disconnected; during the period that the first level is a high level and the second level is a low level, the third control module 103 is turned on, the connection between the storage module 3 and the light emitting device is turned on, and the connection between the driving module 2 and the light emitting device is turned on, so as to drive the light emitting device to emit light.
The memory module 3 has a first node n1 and a second node n2, wherein when the first scan signal and the second scan signal both have a first level and the third scan signal has a second level, the voltage of the first node n1 is a first voltage, and the voltage of the second node n2 is a third voltage; when the first scan signal and the third scan signal both have the first level and the second scan signal has the second level, the voltage difference between the first node n1 and the second node n2 is equal to: the third voltage is subtracted from the sum of the threshold voltage of the driving module 2 and the second voltage.
The present invention further provides a pixel circuit, which is different from the previous embodiment in that the pixel circuit provided in this embodiment specifically describes specific circuit structures of the control module, the storage module, and the driving module. Fig. 2 is a schematic circuit diagram of a pixel circuit according to another embodiment of the present invention.
Referring to fig. 2, the pixel circuit includes: the device comprises a first control module, a second control module and a third control module; the light emitting device includes a memory module and a driving module, where the driving module is connected to the light emitting device d, and it can be understood that the driving module in this embodiment may be a driving transistor.
The pixel circuit provided in the present embodiment will be described in detail below with reference to the drawings.
The first control module 101 includes: a first switching transistor T1 and a second switching transistor T2; the first switching transistor T1 connects the first voltage source VDD and the drain (D) of the driving transistor T7, and turns on or off in response to the first scan signal; the second switching transistor T2 connects the source (S) of the driving transistor T7 with the light emitting device, and is turned on or off in synchronization with the first switching transistor T1. In this embodiment, taking as an example that the first switching transistor T1 and the second switching transistor T2 are turned on when the first scan signal is at a high level, the first switching transistor T1 and the second switching transistor T2 are N-type MOS transistors, i.e., NMOS transistors, and accordingly, one end of the first switching transistor T1 connected to the first voltage source is a drain, one end connected to the driving transistor T7 is a source, one end of the second switching transistor T2 connected to the driving transistor T7 is a drain, and one end connected to the light emitting device is a source. In other embodiments, the first switching transistor T1 and the second switching transistor T2 may be turned on when the first scan signal is at a low level, and the corresponding first switching transistor T1 and the second switching transistor T2 are P-type MOS transistors, i.e., PMOS transistors.
The second control module 102 includes: a third switching transistor T3, a fourth switching transistor T4, and a fifth switching transistor T5; the third switching transistor T3 connects the first node n1 and the drain of the driving transistor T7, and is turned on or off in response to the second Scan signal Scan 1; the fourth switching transistor T4 is connected to the third voltage source Data and the second node n2, and is turned on or off in synchronization with the third switching transistor T3; the fifth switching transistor T5 connects the second voltage source Vinit and the source of the driving transistor T7, and is turned on or off in synchronization with the third switching transistor T3.
The third control module 103 includes: a sixth switching transistor T6, a sixth switching transistor T6 connected between the second node n2 and the light emitting device d, and responding to the third scan signal EM _ \ un-1To be turned on or off.
It is understood that the memory module 3 in this embodiment is a capacitor.
In order to simplify the pixel circuit structure, the first to sixth switching transistors T1 to T6 are all MOS (Metal-Oxide-Semiconductor) transistors, for example. The gate of the first switching transistor T1 receives the first scan signal EM \nA first terminal of the first switching transistor T1 is connected to the operating power supply VDD, and a second terminal of the first switching transistor T1 is connected to the drain of the driving transistor T7; a gate of the second switching transistor T2 receives the first scan signal, a first terminal of the second switching transistor T2 is connected to the source of the driving transistor T7, and a second terminal of the second switching transistor T2 is connected to the light emitting device; gates of the third to fifth switching transistors T3 to T5 receive the second Scan signal Scan1, a first terminal of the third switching transistor T3 is connected to the first node n1, a second terminal of the third switching transistor T3 is connected to the drain of the driving transistor T7, a first terminal of the fourth switching transistor T4 is connected to the second node n2, a second terminal of the fourth switching transistor T4 is connected to the third voltage source Data, a first terminal of the fifth switching transistor T5 is connected to the second voltage source Vinit, and a second terminal of the fifth switching transistor T5 is connected to the source of the driving transistor T7; a first terminal of the sixth switching transistor T6 is connected to the second node n2, and a second terminal of the sixth switching transistor T6 is connected to the light emitting device.
In this embodiment, the first to sixth switching transistors T1 to T6 are all NMOS transistors; a first terminal of the first switching transistor T1 is a drain, and a second terminal of the first switching transistor T1 is a source; a first terminal of the second switching transistor T2 is a drain, and a second terminal of the second switching transistor T2 is a source; a first terminal of the third switching transistor T3 is a drain, and a second terminal of the third switching transistor T3 is a source; a first terminal of the fourth switching transistor T4 is a source, and a second terminal of the fourth switching transistor T4 is a drain; a first terminal of the fifth switching transistor T5 is a drain, and a second terminal of the fifth switching transistor T5 is a source; the first terminal of the sixth switching transistor T6 is a drain, and the second terminal of the sixth switching transistor T6 is a source.
In other embodiments, the first to sixth switching transistors T1 to T6 may also be PMOS transistors; or some of the first to sixth switching transistors T1 to T6 are NOMS transistors, and the rest are PMOS transistors.
In this embodiment, the driving transistor T7 is an NMOS transistor, the first terminal of the driving transistor T7 is connected to the first switching transistor T1, the second terminal of the driving transistor T7 is connected to the second switching transistor T2, and the third terminal of the driving transistor T7 is connected to the memory module 204. Specifically, the first terminal of the driving transistor T7 is a drain, the second terminal of the driving transistor T7 is a source, and the third terminal of the driving transistor T7 is a gate.
It should be noted that, in other embodiments, the driving transistor T7 may also be a driving transmission gate, that is, the driving transistor T7 is formed by a transmission gate, the transmission gate is a parallel structure of an NMOS transistor and a PMOS transistor, which is beneficial to reducing the path resistance and the characteristic complementation, and the characteristic complementation can reduce or eliminate the problem of increased leakage current or the problem of a protruding parasitic effect.
The light emitting device d may be various current driven light emitting devices including LCD, Micro-LED, LED or OLED, and may also be other types of light emitting devices. In the present embodiment, the light emitting device d is taken as an OLED as an example, and fig. 2 shows the light emitting device d as a diode, an anode of the diode is connected to the source of the sixth switching transistor T6, and a cathode of the diode is connected to the ground terminal VSS. In this embodiment, the light emitting device d is in a constant current state during light emission.
In the pixel circuit provided by this embodiment, in the compensation stage of the threshold voltage of all gray scales of the pixel circuit, the extraction of the threshold voltage is independent of the first voltage source VDD, and is unified as the extraction of the second voltage (constant value) of the second voltage source Vinit, so that the compensation uniformity of different gray scales is improved, and further, the brightness uniformity is improved.
The following will combine the timing diagram pairThe operation of the pixel circuit shown in FIG. 2 is explained, and FIG. 3 is a timing diagram of the operation of the pixel circuit shown in FIG. 2, including the first scan signal EM _nA second Scan signal Scan1, and a third Scan signal EM _ \n-1And a timing diagram of the Data signal Data, and for convenience of explanation, the first scan signal EM _ \ is shown in FIG. 3nA second Scan signal Scan1, and a third Scan signal EM _ \n-1And 3 periods of the Data signal Data include waveform diagrams of the first time period Q1, the second time period Q2, and the third time period Q3. It is worth mentioning that the third scanning signal EM _shownin FIG. 3n-1The start position of the low level during the period of changing from the initial high level to Q1 precedes the start position of the high level during the period of changing from the initial low level to Q1 of the second Scan signal Scan1, that is, the third Scan signal EM _n-1The second Scan signal Scan1 changes to the high level after changing to the low level for a while. In this way, the "third scanning signal EM _ \" is avoidedn-1The second Scan signal Scan1 has not yet changed to the low level, and thus the circuit between the first voltage source VDD and the third voltage source Data is a path, which causes a short circuit of the IC chip, thereby further improving the reliability of the pixel circuit.
In the period Q1, the first scan signal EM _ \nAnd the second Scan signal Scan1 has a high level, the third Scan signal EM \ un-1Having a low level, the first to fifth switching transistors T1 to T5 are all in an on state, and the sixth switching transistor T6 is in an off state. A first voltage supplied from a first voltage source VDD is written into a first node n1 through a first switching transistor T1 and a third switching transistor T3 to initialize n 1; a second voltage supplied from the second voltage source Vinit is written to the anode point of the light emitting device through the fifth switching transistor T5 and the second switching transistor T2 to initialize it; the third voltage provided by the third voltage source Data is written into the second node n2 through the fourth switching transistor T4, it is understood that the first voltage provided by the first voltage source VDD is greater than the second voltage provided by the second voltage source Vinit, and the gate voltage of the driving transistor T7 is equal to the first voltage and the source voltage is equal to the second voltage, so as to drive the driving transistor T7The transistor T7 is in the on state.
In the period Q2, the first scan signal EM _ \nAnd a third scanning signal EMn-1Having a low level, the second Scan signal Scan1 has a high level, the first to fourth switching transistors T1 to T4 are all in a turned-on state, and the fifth and sixth switching transistors T5 and T6 are in a turned-off state. The second voltage provided by the second voltage source Vinit is written into the first node n1 through the fifth switching transistor T5, the driving transistor T7 and the third switching transistor T3, the voltage of the first node n1 is continuously decreased from the first voltage until the sum of the threshold voltage of the driving transistor T7 and the second voltage, at this time, the gate voltage of the driving transistor T7 is equal to the sum of the threshold voltage of the driving transistor T7 and the second voltage, the source voltage is equal to the second voltage, and therefore the driving transistor T7 is in a cut-off state.
In the period Q3, the first scan signal EM _ \nAnd a third scanning signal EMn-1Having a high level, the second Scan signal Scan1 has a low level, the first to fourth switching transistors T1 to T4 are all in an off state, and the fifth and sixth switching transistors T5 and T6 are in an on state. The voltage of the second node n2 is changed from VDataJumping to VSS + Voled (as can be seen from fig. 2, since the sixth switching transistor T6 is in a turned-on state, the voltage of the second node n2 is the same as the voltage of the anode point of the light emitting device), the voltage of the first node n1 is changed from Vinit + Vth to Vinit + Vth + VSS + Voled-V due to the capacitive couplingDataAt this time, the driving current of the driving transistor T7 is set to be
Wherein, VDataThe third voltage is provided for the third voltage source, Voled is the voltage at two ends of the light emitting device, VSS is the voltage of the ground terminal, Vinit is the second voltage provided for the second voltage source, Vth is the threshold voltage of the driving transistor, w is the channel width of the driving transistor, L is the channel length of the driving transistor, μ is the mobility of the driving transistor, and Cox is the capacitance constant of the driving transistor.
As can be seen from the above formula, the magnitude of the driving current is independent of both the first voltage source VDD and the ground voltage source VSS, so that the voltage drop of the first voltage source VDD and the ground voltage source VSS does not affect the pixel circuit in this embodiment, and the display uniformity of the display device having the pixel circuit in this embodiment is not affected, thereby improving the brightness uniformity of the display panel; in addition, since the voltage drop of the ground voltage source VSS does not affect the magnitude of the driving current of the driving transistor T7, the ground voltage source VSS does not need to be designed to be large in the design process of the ground voltage source VSS, so that the voltage difference between the first voltage source VDD and the ground voltage source VSS can be reduced, and the power consumption of the panel body can be greatly reduced. In addition, when the light emitting device is aged, VSS + Voled becomes large, but the light emitting current does not change, so that the luminance emitted from the light emitting device does not change, thereby being capable of solving the problem of the luminance change of the display apparatus caused by the aging of the light emitting device.
A second embodiment of the present invention relates to a driving method of a pixel circuit, and the present embodiment is a method class embodiment corresponding to the first embodiment, and the technical features of the first embodiment can be implemented in the present embodiment, and are not repeated herein for the sake of avoiding redundancy.
The specific flow of this embodiment is shown in fig. 4, and includes the following steps:
s101: the first scanning signal controls the first switching transistor and the second switching transistor to be in a conducting state, and the second scanning signal controls the third switching transistor, the fourth switching transistor and the fifth switching transistor to be in a conducting state; the first voltage provided by the first voltage source initializes the gate of the driving transistor, the third voltage provided by the third voltage source initializes the second node of the storage capacitor, the second voltage provided by the second voltage source initializes the source of the driving transistor, and the third scan signal controls the sixth switching transistor to be in an off state. It is to be understood that, in fig. 4, the switching transistor is an abbreviation of switching transistor. Specifically, the second voltage provided by the second voltage source is also written into the anode point of the light emitting device through the fifth switching transistor and the second switching transistor to initialize the light emitting device; a third voltage provided by a third voltage source is written into a second node of the capacitor through a fourth switching transistor; it can be understood that, since the first voltage provided by the first voltage source is greater than the second voltage provided by the second voltage source, the gate voltage of the driving transistor is equal to the first voltage, and the source voltage is equal to the second voltage, so that the driving transistor is in a conducting state.
S102: the first scan signal controls the first and second switching transistors to be turned from an on state to an off state to compensate for a threshold voltage of the driving transistor.
Specifically, at this time, the second voltage provided by the second voltage source is written into the first node of the capacitor through the fifth switching transistor, the driving transistor and the third switching transistor, the voltage of the first node is continuously reduced from the first voltage until the voltage is equal to the sum of the threshold voltage of the driving transistor and the second voltage, the gate voltage of the driving transistor is equal to the sum of the threshold voltage of the driving transistor and the second voltage, and the source voltage is equal to the second voltage, so that the driving transistor is in a cut-off state.
S103: the second scanning signal controls the third to fifth switching transistors to be changed from a turn-on state to a turn-off state, the first control signal controls the first and second switching transistors to be changed from a turn-off state to a turn-on state, and the third control signal controls the sixth switching transistor to be changed from a turn-off state to a turn-on state; the current flows into the light emitting diode, and the light emitting diode emits light.
Specifically, the voltage of the second node of the storage capacitor is VDataThe voltage of the grid electrode of the driving transistor is changed from Vinit + Vth to Vinit + Vth + VSS + Voled-VDataThe driving current of the driving transistor is as follows:
wherein, VDataA third voltage provided for the third voltage source, Voled is a voltage across the light emitting device, VSS is a ground terminal voltage, Vinit is a second voltage provided for the second voltage source, Vth is a threshold voltage of the driving transistor, w is a channel width of the driving transistor,l is the channel length of the drive transistor, μ is the mobility of the drive transistor, and Cox is the capacitance constant of the drive transistor.
In the above technical solution, in the first stage, the first voltage of the first voltage source initializes the gate of the driving transistor, and the second voltage of the second voltage source initializes the source of the driving transistor, so that the driving transistor is in a conducting state.
In the second stage, the connection between the gate of the driving transistor and the first voltage source is disconnected, and the source of the driving transistor is kept connected with the second voltage source, so that the voltage of the gate is continuously reduced until the voltage is equal to the sum of the second voltage and the threshold voltage (at this time, the voltage difference between the gate and the source of the driving transistor is equal to the threshold voltage, so that the driving transistor is in a cut-off state, and the voltage of the gate is not continuously reduced), thereby completing the extraction of the threshold voltage. By the method, in the compensation stage of the threshold voltage of all gray scales of the pixel circuit, the extraction of the threshold voltage is independent of the first voltage source and is unified as the extraction of the second voltage (constant value) of the second voltage source, so that the compensation uniformity of different gray scales is improved, and the brightness uniformity is improved.
In the third stage, the magnitude of the driving current is irrelevant to both the first voltage source VDD and the ground voltage source VSS, so that the voltage drop of the first voltage source VDD and the ground voltage source VSS does not affect the pixel circuit in the embodiment, so that the display uniformity of the display device having the pixel circuit in the embodiment is not affected, and the brightness uniformity of the display panel is improved; in addition, since the voltage drop of the ground voltage source VSS does not affect the magnitude of the driving current of the driving transistor T7, the ground voltage source VSS does not need to be designed to be large in the design process of the ground voltage source VSS, so that the voltage difference between the first voltage source VDD and the ground voltage source VSS can be reduced, and the power consumption of the panel body can be greatly reduced. In addition, when the light emitting device is aged, VSS + Voled becomes large, but the light emitting current does not change, so that the luminance emitted from the light emitting device does not change, thereby being capable of solving the problem of the luminance change of the display apparatus caused by the aging of the light emitting device.
Correspondingly, the embodiment of the invention also provides a display device which comprises the pixel circuit and the light-emitting device. The display device can be a product or a component with a television function, such as a display panel, a mobile phone, a tablet computer, a television, a display, a digital photo frame or a navigator.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A pixel circuit, comprising:
the first control module responds to a first scanning signal from a first scanning line to be turned on or turned off, and when the first control module is turned on, the output end of the first control module outputs a first voltage from a first voltage source;
the second control module responds to a second scanning signal from a second scanning line to be turned on or off, and when the second control module is turned on, the output end of the second control module outputs a second voltage from a second voltage source;
the driving module is respectively connected with the first control module and the second control module, the first control module transmits the first voltage to a grid electrode of the driving module when being conducted, the second control module transmits the second voltage to a source electrode of the driving module when being conducted, the grid electrode voltage of the driving module is equal to the sum of the second voltage and a threshold voltage of the driving module when the first control module and the second control module are in a preset state, and the source electrode voltage of the driving module is equal to the second voltage.
2. The pixel circuit according to claim 1, wherein when the first scan signal and the second scan signal both have a first level, a gate of the driving module obtains the first voltage;
when the first scan signal has a second level and the second scan signal has a first level, the gate voltage of the driving module is equal to the sum of the second voltage and the threshold voltage of the driving module, wherein the first level and the second level have opposite phases.
3. The pixel circuit according to claim 2, further comprising a third control module, a third voltage source, and a storage module;
the third control module responds to a third scanning signal from a third scanning line to be switched on or switched off; the memory module stores a third voltage of the third voltage source when the second scan signal has a first level, the first scan signal and the third scan signal all have a second level; the driving module drives the light emitting device to emit light when the second scan signal has a second level and the first scan signal and the third scan signal all have a first level.
4. The pixel circuit according to claim 3, wherein the storage module has a first node and a second node, and wherein when the first scan signal and the second scan signal both have a first level and the third scan signal has a second level, the voltage of the first node is a first voltage and the voltage of the second node is a third voltage;
when the first scanning signal and the third scanning signal both have a first level and the second scanning signal has a second level, the voltage difference between the first node and the second node is equal to: the third voltage is subtracted from the sum of the threshold voltage of the driving module and the second voltage.
5. The pixel driving circuit according to claim 4, wherein the first control module comprises: a first switching transistor and a second switching transistor; the first switch transistor is connected with the first voltage source and the drain electrode of the driving module and responds to the first scanning signal to be switched on or switched off; the second switching transistor is connected with the source electrode of the driving module and the light-emitting device and is synchronously switched on or switched off with the first switching transistor;
the second control module includes: a third switching transistor, a fourth switching transistor, and a fifth switching transistor; the third switching transistor is connected with the first node and the drain electrode of the driving module and responds to the second scanning signal to be turned on or turned off; the fourth switching transistor is connected with the third voltage source and the second node and is synchronously switched on or switched off with the third switching transistor; the fifth switching transistor is connected with the second voltage source and the source electrode of the driving module and is synchronously switched on or switched off with the third switching transistor;
the third control module includes: a sixth switching transistor connected to the second node and the light emitting device and turned on or off in response to the third scan signal.
6. The pixel circuit according to claim 5, wherein at least one of the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, and the sixth switch transistor is a MOS transistor;
preferably, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor and the sixth switch transistor are MOS transistors;
preferably, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor and the sixth switch transistor are all NMOS transistors.
7. The pixel circuit according to claim 3, wherein the second voltage and the third voltage are both less than the first voltage.
8. A driving method of the pixel circuit according to any one of claims 1 to 7, comprising:
in the first stage, a first scanning signal controls a first switching transistor and a second switching transistor to be in a conducting state, and a second scanning signal controls a third switching transistor, a fourth switching transistor and a fifth switching transistor to be in a conducting state; the first voltage provided by the first voltage source initializes the grid electrode of the driving module, the third voltage provided by the third voltage source initializes the second node of the storage capacitor, the second voltage provided by the second voltage source initializes the source electrode of the driving module, and the third scanning signal controls the sixth switching transistor to be in a cut-off state;
in the second stage, the first scanning signal controls the first switching transistor and the second switching transistor to be changed from a conducting state to a cut-off state so as to compensate the threshold voltage of the driving module;
a third stage in which the second scan signal controls the third to fifth switching transistors to be turned from an on state to an off state, the first control signal controls the first and second switching transistors to be turned from an off state to an on state, and the third control signal controls the sixth switching transistor to be turned from an off state to an on state; current flows into the light emitting diode, which emits light.
9. The method according to claim 8, wherein the voltage at the second node of the storage capacitor is set to V at the third stageDataThe voltage of the first node of the storage capacitor is changed from Vinit + Vth to Vinit + Vth + VSS + Voled-VDataThe driving current of the driving module is as follows:
wherein, VDataThe third voltage is provided for the third voltage source, Voled is a voltage at two ends of the light emitting device, VSS is a ground terminal voltage, Vinit is a second voltage provided for the second voltage source, Vth is a threshold voltage of the driving module, w is a channel width of the driving module, L is a channel length of the driving module, μ is a mobility of the driving module, and Cox is a capacitance constant of the driving module.
10. A display device comprising the pixel circuit according to any one of claims 1 to 7 or the pixel circuit in the driving method of the pixel circuit according to any one of claims 8 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011401925.9A CN112365842A (en) | 2020-12-02 | 2020-12-02 | Pixel circuit, driving method thereof and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011401925.9A CN112365842A (en) | 2020-12-02 | 2020-12-02 | Pixel circuit, driving method thereof and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112365842A true CN112365842A (en) | 2021-02-12 |
Family
ID=74535174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011401925.9A Pending CN112365842A (en) | 2020-12-02 | 2020-12-02 | Pixel circuit, driving method thereof and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112365842A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113035133A (en) * | 2021-03-26 | 2021-06-25 | 昆山国显光电有限公司 | Pixel driving circuit, driving method of pixel driving circuit and display panel |
| CN113707068A (en) * | 2021-08-26 | 2021-11-26 | 京东方科技集团股份有限公司 | Display panel power supply circuit, power supply method and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104157241A (en) * | 2014-08-15 | 2014-11-19 | 合肥鑫晟光电科技有限公司 | Pixel drive circuit and drive method thereof and display device |
| CN204130142U (en) * | 2014-11-13 | 2015-01-28 | 合肥鑫晟光电科技有限公司 | A kind of image element circuit, organic EL display panel and display device |
| CN104821150A (en) * | 2015-04-24 | 2015-08-05 | 北京大学深圳研究生院 | Pixel circuit, driving method thereof and display device |
| CN106652904A (en) * | 2017-03-17 | 2017-05-10 | 京东方科技集团股份有限公司 | Pixel drive circuit, drive method thereof, and display device |
| CN111599313A (en) * | 2020-06-01 | 2020-08-28 | 昆山国显光电有限公司 | Pixel driving circuit, driving method and display panel |
-
2020
- 2020-12-02 CN CN202011401925.9A patent/CN112365842A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104157241A (en) * | 2014-08-15 | 2014-11-19 | 合肥鑫晟光电科技有限公司 | Pixel drive circuit and drive method thereof and display device |
| CN204130142U (en) * | 2014-11-13 | 2015-01-28 | 合肥鑫晟光电科技有限公司 | A kind of image element circuit, organic EL display panel and display device |
| CN104821150A (en) * | 2015-04-24 | 2015-08-05 | 北京大学深圳研究生院 | Pixel circuit, driving method thereof and display device |
| CN106652904A (en) * | 2017-03-17 | 2017-05-10 | 京东方科技集团股份有限公司 | Pixel drive circuit, drive method thereof, and display device |
| CN111599313A (en) * | 2020-06-01 | 2020-08-28 | 昆山国显光电有限公司 | Pixel driving circuit, driving method and display panel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113035133A (en) * | 2021-03-26 | 2021-06-25 | 昆山国显光电有限公司 | Pixel driving circuit, driving method of pixel driving circuit and display panel |
| CN113707068A (en) * | 2021-08-26 | 2021-11-26 | 京东方科技集团股份有限公司 | Display panel power supply circuit, power supply method and display device |
| CN113707068B (en) * | 2021-08-26 | 2023-12-05 | 京东方科技集团股份有限公司 | Display panel power supply circuit, power supply method and display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI737214B (en) | Electronic devices with low refresh rate display pixels | |
| US11881164B2 (en) | Pixel circuit and driving method thereof, and display panel | |
| US10490136B2 (en) | Pixel circuit and display device | |
| KR100329435B1 (en) | Organic el display device having an improved image quality | |
| JP6142178B2 (en) | Display device and driving method | |
| JP4398413B2 (en) | Pixel drive circuit with threshold voltage compensation | |
| US9349313B2 (en) | Display device and driving method thereof | |
| WO2016187990A1 (en) | Pixel circuit and drive method for pixel circuit | |
| CN113571009B (en) | Light emitting device driving circuit, backlight module and display panel | |
| CN107358915A (en) | A kind of image element circuit, its driving method, display panel and display device | |
| CN105575327B (en) | A kind of image element circuit, its driving method and organic EL display panel | |
| CN113035133A (en) | Pixel driving circuit, driving method of pixel driving circuit and display panel | |
| CN104751804A (en) | Pixel circuit, driving method thereof and relevant device | |
| CN113744683B (en) | Pixel circuit, driving method and display device | |
| CN111696473A (en) | Pixel driving circuit, driving method of pixel driving circuit and display panel | |
| CN113593481B (en) | Display panel and driving method thereof | |
| CN110992895B (en) | Pixel driving circuit and display panel | |
| WO2019174372A1 (en) | Pixel compensation circuit, drive method, electroluminescent display panel, and display device | |
| US11568815B2 (en) | Pixel driving circuit, manufacturing method thereof, and display device | |
| CN114078430A (en) | Pixel circuit and display panel | |
| CN113658555A (en) | Pixel driving circuit, driving method and display panel | |
| CN110189703B (en) | Display panel and display device | |
| CN114093321A (en) | Pixel driving circuit, driving method, display panel and display device | |
| CN112365842A (en) | Pixel circuit, driving method thereof and display device | |
| CN113066427B (en) | Pixel circuit, light emitting display device and driving method thereof |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210212 |
|
| RJ01 | Rejection of invention patent application after publication |