CN110415644B - Pixel driving circuit and method thereof, and display panel - Google Patents
Pixel driving circuit and method thereof, and display panel Download PDFInfo
- Publication number
- CN110415644B CN110415644B CN201910712309.6A CN201910712309A CN110415644B CN 110415644 B CN110415644 B CN 110415644B CN 201910712309 A CN201910712309 A CN 201910712309A CN 110415644 B CN110415644 B CN 110415644B
- Authority
- CN
- China
- Prior art keywords
- signal
- reset
- unit
- voltage
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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]
-
- 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
- G09G3/3233—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 current through the light-emitting element
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention provides a pixel driving circuit, a pixel driving method and a display panel, belongs to the technical field of display, and can at least partially solve the problem that the brightness of a display picture is uneven due to the conventional pixel driving circuit. A pixel driving circuit of the present invention includes: the device comprises a driving unit, a light emitting unit, a resetting unit, a light emitting control unit, a writing compensation unit and a detection adjustment unit; the reset unit is used for controlling the voltage of the first node according to the second voltage end; a write compensation unit for writing data signals and compensation data of the data line end to the first node by adjustment of the driving unit; a reset unit for inputting a reset signal to the light emitting unit according to the control of the second voltage terminal; a light emission control unit for writing a display current to the light emission unit by controlling the driving unit, the magnitude of the display current being related to the data signal and the voltage of the first voltage terminal; and the detection and adjustment unit is used for adjusting the data signal of the data line end according to the display current.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a pixel driving circuit and method and a display panel.
Background
The application of active matrix organic light emitting diode panels (Active Matrix Organic Light Emitting Diode, abbreviated as AMOLED) is becoming more and more widespread. The pixel display device of the AMOLED is an Organic Light-Emitting Diode (OLED), and the AMOLED is capable of Emitting Light by generating a driving current in a saturated state through a driving transistor, and the driving current drives the Light-Emitting device to emit Light.
However, the poor uniformity of the threshold voltage Vth between the driving transistors or the aging of the organic light emitting diode caused in the process may cause the problem of uneven brightness of the active matrix organic light emitting diode panel.
Disclosure of Invention
The invention at least partially solves the problem of uneven brightness of a display picture caused by the traditional pixel driving circuit, and provides the pixel driving circuit which can make the brightness of the display picture uniform.
The technical scheme adopted for solving the technical problem of the invention is a pixel driving circuit, which comprises: the device comprises a driving unit, a light emitting unit, a storage unit, a reset unit, a light emitting control unit, a writing compensation unit and a detection adjustment unit;
the driving unit is used for driving the light-emitting unit to emit light;
the first end of the storage unit is connected with a first voltage end, and the second end of the storage unit is connected with a first node;
the reset unit is used for controlling the voltage of the first node according to a second voltage end;
the write compensation unit is used for writing data signals and compensation data of the data line end into the first node through adjustment of the driving unit;
the reset unit is used for inputting a reset signal to the light-emitting unit according to the control of the second voltage end;
the light-emitting control unit is used for writing display current to the light-emitting unit by controlling the driving unit, wherein the display current is related to the data signal and the voltage of the first voltage terminal;
the detection and adjustment unit is used for adjusting the data signal of the data line end according to the display current.
It is further preferred that the reset unit includes: the grid electrode of the first transistor is connected with the first reset end, the first electrode of the first transistor is connected with the first node, and the second electrode of the first transistor is connected with the second voltage end.
It is further preferred that the write compensation unit includes: a second transistor, the gate of which is connected to the gate terminal, the first electrode is connected to the second node, and the second electrode is connected to the data terminal; and a third transistor, wherein a gate electrode of the third transistor is connected with a gate terminal, a first electrode of the third transistor is connected with the first node, and a second electrode of the third transistor is connected with the third node.
It is further preferable that the reset unit includes: and the grid electrode of the fourth transistor is connected with the second reset end, the first electrode of the fourth transistor is connected with the second voltage end, and the second electrode of the fourth transistor is connected with the input end of the light-emitting unit.
It is further preferable that the light emission control unit includes: a fifth transistor, the grid of which is connected with the first signal end, the first electrode is connected with the first voltage end, and the second electrode is connected with the second node; and the grid electrode of the sixth transistor is connected with the first signal end, the first electrode of the sixth transistor is connected with the third voltage end, and the second electrode of the sixth transistor is connected with the input end of the light-emitting unit.
It is further preferred that the driving unit includes: and a seventh transistor, wherein the grid electrode of the seventh transistor is connected with the first node, the first electrode of the seventh transistor is connected with the second node, and the second electrode of the seventh transistor is connected with the third node.
It is further preferred that the storage unit includes: and the first electrode of the storage capacitor is connected with the first voltage end, and the second electrode of the storage capacitor is connected with the first node.
Further preferably, the detection adjustment unit includes: an eighth transistor, the grid electrode of which is connected with the second signal end, and the first electrode of which is connected with the input end of the light-emitting unit; an amplifier having a first terminal connected to the second terminal of the eighth transistor and a second terminal connected to ground for amplifying the display current; the input end of the first analog-to-digital converter is connected with the third end of the amplifier and is used for performing analog-to-digital conversion on the amplified display current;
the first end of the query subunit is connected with the output end of the first analog-to-digital converter and is used for adjusting signals from the first analog-to-digital converter;
the first end of the storage subunit is connected with the second end of the query subunit, and the storage subunit is used for storing signals obtained after the adjustment of the query subunit; and the input end of the second analog-to-digital converter is connected with the second end of the storage subunit, the output end of the second analog-to-digital converter is connected with the data line end, and the second analog-to-digital converter is used for performing analog-to-digital conversion on the signals stored by the storage subunit and transmitting the converted signals to the data line end.
It is further preferred that the pixel driving circuit according to claim 1, all transistors are N-type transistors; alternatively, all transistors are P-type transistors.
The technical scheme adopted for solving the technical problem of the invention is a pixel driving method, the pixel driving method is based on the pixel driving circuit, and the pixel driving method comprises the following steps:
in a reset phase, the reset unit controls the voltage of the first node according to a second voltage terminal;
in the data writing stage, the writing compensation unit writes a data signal and compensation data of a data line end to a first node through adjustment of the driving unit;
in a reset stage, the reset unit inputs a reset signal to the light emitting unit according to control of a second voltage terminal;
in a display stage, the light emission control unit writes a display current to the light emission unit by controlling the driving unit, the magnitude of the display current being related to the data signal and the voltage of the first voltage terminal;
in the detection adjustment stage, the detection adjustment unit adjusts the data signal of the next frame of the data line end according to the display current.
The technical scheme adopted for solving the technical problem of the invention is that the pixel driving method specifically comprises the following steps:
a reset stage, in which a first reset signal is input to the second voltage terminal, a conduction signal is input to the first reset terminal, and a turn-off signal is input to the gate terminal, the second reset terminal, the first signal terminal and the second signal terminal;
a data writing stage, in which the data signal is input to the data line end, a conduction signal is input to the gate line end, and a turn-off signal is input to the first reset end, the second reset end, the first signal end and the second signal end;
a reset stage, in which a second reset signal is input to the second voltage terminal, a conduction signal is input to the second reset terminal, and a turn-off signal is input to the gate terminal, the first reset terminal, the first signal terminal and the second signal terminal;
a display stage, in which a display voltage is input to the first voltage terminal, a conduction signal is input to the first signal terminal, and a turn-off signal is input to the gate terminal, the first reset terminal, the second reset terminal and the second signal terminal;
in the detection and adjustment stage, a display voltage is input to the first voltage end, a conduction signal is input to the first signal end and the second signal end, and a turn-off signal is input to the grid end, the first reset end and the second reset end
The technical scheme adopted for solving the technical problem of the invention is that the display panel comprises a plurality of pixel driving circuits, wherein the pixel driving circuits are the pixel driving circuits.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
fig. 1 is a schematic diagram of a pixel driving circuit according to an embodiment of the invention;
FIG. 2 is a timing diagram illustrating operation of the pixel driving circuit shown in FIG. 1;
wherein, the reference numerals are as follows: 1. a driving unit; 2. a light emitting unit; 3. a storage unit; 4. a reset unit; 5. a reset unit; 6. a light emission control unit; 7. a write compensation unit; 8. a detection adjustment unit; VDD, a first voltage terminal; VINT, second voltage terminal; RST1, a first reset end; RST2, a second reset end; GATE, GATE terminal; DATA, DATA line end; an EM and a first signal terminal; sen, the second signal terminal; AND a fourth node; m1, a first transistor; m2, a second transistor; m3, a third transistor; m4, a fourth transistor; m5, fifth transistors; m6, sixth transistor; m7, seventh transistor; m8, eighth transistor; n1, a first node; n2, a second node; n3, a third node; 91. an amplifier; 92. a first analog-to-digital converter; 93. a query subunit; 94. a storage subunit; 95. a second analog-to-digital converter; t1, a reset stage; t2, a data writing stage; t3, resetting; t4, a transition stage; t5, a display stage; t6, detecting and adjusting; C. and a storage capacitor.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of better understanding of the technical solution of the present invention to those skilled in the art.
The invention will be described in more detail below with reference to the accompanying drawings. Like elements are denoted by like reference numerals throughout the various figures. For clarity, the various features of the drawings are not drawn to scale. Furthermore, some well-known portions may not be shown in the drawings.
Numerous specific details of the invention, such as construction, materials, dimensions, processing techniques and technologies, may be set forth in the following description in order to provide a thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
Example 1:
as shown in fig. 1 and 2, the present embodiment provides a pixel driving circuit including: a driving unit 1, a light emitting unit 2, a storage unit 3, a reset unit 4, a reset unit 5, a light emission control unit 6, a write compensation unit 7, and a detection adjustment unit 8;
a driving unit 1 for driving the light emitting unit 2 to emit light;
the first end of the memory cell 3 is connected with the first voltage end VDD, and the second end is connected with the first node N1;
a reset unit 4 for controlling the voltage of the first node N1 according to the second voltage terminal VINT;
a write compensation unit 7 for writing a DATA signal of the DATA line terminal DATA and compensation DATA to the first node N1 by adjustment of the driving unit 1;
a reset unit 5 for inputting a reset signal to the light emitting unit 2 according to control of the second voltage terminal VINT;
a light emission control unit 6 for writing a display current to the light emission unit 2 by controlling the driving unit 1, the magnitude of the display current being related to the data signal and the voltage of the first voltage terminal VDD;
the detection adjustment unit 8 is used for adjusting the DATA signal of the DATA line terminal DATA according to the display current.
Wherein the driving unit 1, the storage unit 3, the reset unit 4, the reset unit 5, and the light emission control unit 6 are used as units for internal compensation of the pixel driving circuit, and the internal compensation can improve non-uniformity of light emission caused by poor uniformity of threshold voltage Vth between driving transistors; and the detection adjustment unit 8 serves as a unit for external compensation of the pixel driving circuit, which can improve the non-uniformity of light emission due to the aging of the light emitting unit 2 (i.e., the organic light emitting diode), thereby improving the display uniformity of the display panel having the pixel driving circuit by the combined action of the internal compensation and the external compensation.
In the pixel driving circuit of the embodiment, the combination of the internal compensation and the external compensation is adopted, so that the defects of complex structure, limited compensation range and the like of the pixel driving circuit caused by only the internal compensation can be avoided, and the defects of complex compensation process, low compensation running speed and the like caused by only the external compensation can be avoided.
Specifically, the reset unit 4 includes:
the first transistor M1 has a gate connected to the first reset terminal RST1, a first pole connected to the first node N1, and a second pole connected to the second voltage terminal VINT.
The write compensation unit 7 includes:
a second transistor M2, the GATE of which is connected to the GATE terminal GATE, the first electrode is connected to the second node N2, and the second electrode is connected to the DATA terminal DATA;
the third transistor M3 has a GATE connected to the GATE terminal GATE, a first electrode connected to the first node N1, and a second electrode connected to the third node N3.
The reset unit 5 includes:
the gate of the fourth transistor M4 is connected to the second reset terminal RST2, the first electrode is connected to the second voltage terminal VINT, and the second electrode is connected to the input terminal of the light emitting unit 2.
The input end of the second electrode connection light emitting unit 2 is a fourth node AND.
The light emission control unit 6 includes:
a fifth transistor M5, the gate of which is connected to the first signal terminal EM, the first pole is connected to the first voltage terminal VDD, and the second pole is connected to the second node N2;
the gate of the sixth transistor M6 is connected to the first signal terminal EM, the first pole is connected to the third voltage terminal, and the second pole is connected to the input terminal of the second light emitting unit 2.
The drive unit 1 includes:
the seventh transistor M7 has a gate connected to the first node N1, a first pole connected to the second node N2, and a second pole connected to the third node N3.
The storage unit 3 includes:
and a first electrode of the storage capacitor C is connected with the first voltage end VDD, and a second electrode of the storage capacitor C is connected with the first node N1.
The detection adjustment unit 8 includes:
an eighth transistor M8 having a gate connected to the second signal terminal Sen and a first electrode connected to the input terminal of the light emitting unit 2;
an amplifier 91 having a first terminal connected to the second terminal of the eighth transistor M8 and a second terminal grounded for amplifying the display current;
a first analog-to-digital converter 92, an input end of which is connected to a third end of the amplifier 91, for performing analog-to-digital conversion on the amplified display current;
a query subunit 93, a first end of which is connected to the output end of the first analog-to-digital converter 92, for adjusting the signal from the first analog-to-digital converter 92;
the first end of the storage subunit 94 is connected to the second end of the query subunit 93, and is used for storing the signal obtained after the adjustment of the query subunit 93;
the second analog-to-digital converter 95 has an input terminal connected to the second terminal of the storage subunit 94, and an output terminal connected to the DATA terminal DATA, and is configured to perform analog-to-digital conversion on the signal stored in the storage subunit 94, and transmit the converted signal to the DATA terminal DATA.
Wherein, all transistors are N-type transistors; alternatively, all transistors are P-type transistors.
The light emitting unit 2 in the present embodiment may be a current driven light emitting device including an LED (Light Emitting Diode ) or an OLED (Organic Light Emitting Diode, organic light emitting diode) in the prior art, and the description is given taking the OLED as an example in the present embodiment.
The embodiment also provides a pixel driving method, which is based on the pixel driving circuit, and includes:
in the reset phase t1, the reset unit 4 controls the voltage of the first node N1 according to the second voltage terminal VINT;
in the DATA writing stage t2, the write compensation unit 7 writes the DATA signal of the DATA line terminal DATA and the compensation DATA to the first node N1 by the adjustment of the driving unit 1;
in the reset phase t3, the reset unit 5 inputs a reset signal to the light emitting unit 2 according to the second voltage terminal VINT;
in the display phase t5, the light emission control unit 6 writes a display current to the light emission unit 2 by controlling the driving unit 1, the magnitude of the display current being related to the data signal and the voltage of the first voltage terminal VDD;
in the detection adjustment stage t6, the detection adjustment unit 8 adjusts the DATA signal of the next frame of the DATA line terminal DATA according to the display current.
Specifically, in the method, the first voltage terminal VDD is used to provide an operating voltage, and the pixel driving method specifically includes:
s11, a reset stage t1, in which a first reset signal is input to the second voltage terminal VINT, a turn-on signal is input to the first reset terminal RST1, and a turn-off signal is input to the GATE terminal GATE, the second reset terminal RST2, the first signal terminal EM, and the second signal terminal Sen.
The first reset signal is a signal capable of bringing the first node N1 into an initial state, the on signal is a signal capable of turning on the transistor when the first node N1 is loaded on the gate of the transistor, and the off signal is a signal capable of turning off the transistor when the first node N1 is loaded on the gate of the transistor.
It should be noted that, in the following description, all transistors are P-type transistors, so that the on signal is a low level signal and the off signal is a high level signal.
In this stage, that is, the GATE terminal GATE, the second reset terminal RST2, the first signal terminal EM, and the second signal terminal Sen input a high level, the transistors except the first transistor M1 are turned off, and a low level is input to the first reset terminal RST1, the first transistor M1 is turned on, and the first reset signal of the second voltage terminal VINT is written into the first node N1 through the first transistor M1, so that the GATE-source voltage Vgs of the seventh transistor M7 is cleared, and the storage capacitor C is charged.
S12, a DATA writing stage t2, in which a DATA signal is input to the DATA line terminal DATA, a turn-on signal is input to the GATE line terminal GATE, and a turn-off signal is input to the first reset terminal RST1, the second reset terminal RST2, the first signal terminal EM, and the second signal terminal Sen.
In this stage, that is, the first reset terminal RST1, the second reset terminal RST2, the first signal terminal EM, and the second signal terminal Sen are inputted with a high level, the first transistor M1, the fourth transistor M4, the fifth transistor M5, the sixth transistor M6, and the eighth transistor M8 are turned off, the second transistor M2, and the third transistor M3 are inputted with a low level, and at the same time, the seventh transistor M7 is turned on due to the storage capacitor C, so that the DATA signal of the DATA line terminal DATA is written into the first node N1 through the second transistor M2, the seventh transistor M7, and the third transistor M3 until the voltage of the first node N1 becomes the sum of the voltage and the threshold voltage of the DATA signal (vg=data+vth).
S13, a reset stage t3, in which a second reset signal is input to the second voltage terminal VINT, a turn-on signal is input to the second reset terminal RST2, and a turn-off signal is input to the GATE terminal GATE, the first reset terminal RST1, the first signal terminal EM, and the second signal terminal Sen.
In this stage, that is, the GATE terminal GATE, the first reset terminal RST1, the first signal terminal EM, and the second signal terminal Sen input a high level, so that the transistors except the fourth transistor M4 are turned off, the second reset terminal RST2 inputs a low level, and the fourth transistor M4 is turned on, so that the second reset signal of the second voltage terminal VINT is written into the light emitting unit 2, wherein the second reset signal is a signal that causes the light emitting unit 2 (OLED) not to emit light, and the signal is a voltage slightly greater than that when the light emitting unit 2 emits light, so as to protect the material of the light emitting unit 2.
S14, a transition stage t4 inputs a turn-off signal to the GATE terminal GATE, the first reset terminal RST1, the second reset terminal RST2, the first signal terminal EM and the second signal terminal Sen for preparing for the next stage.
S15, a display stage t5, in which a display voltage is input to the first voltage terminal VDD, a turn-on signal is input to the first signal terminal EM, and a turn-off signal is input to the GATE terminal GATE, the first reset terminal RST1, the second reset terminal RST2, and the second signal terminal Sen.
In this stage, that is, the GATE terminal GATE, the first reset terminal RST1, the second reset terminal RST2, and the second signal terminal Sen input a high level, the first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4, and the eighth transistor M8 are turned off, the first signal terminal EM inputs a low level, the fifth transistor M5 and the sixth transistor M6 are turned on, and the seventh transistor M7 is turned on by the storage capacitor C. Due to the effect of the first voltage terminal VDD, the voltage of the second node N2 becomes VDD, and the voltage of the first node N1 remains data+vth due to the storage capacitor C, the difference Vgs-vth= (data+vth-VDD) -vth=data-VDD for the gate-source voltage and the threshold voltage of the seventh transistor M7, and thus the difference between the gate-source voltage and the threshold voltage of the seventh transistor M7 is not affected by the threshold voltage Vth, thereby avoiding non-uniformity of light emission due to poor uniformity of the threshold voltage Vth.
Meanwhile, as VDD is a constant voltage, the adjustment of the display voltage can be realized only by adjusting Data.
S16, a detection and adjustment stage t6, wherein a display voltage is input to the first voltage terminal VDD, a conduction signal is input to the first signal terminal EM and the second signal terminal Sen, and a turn-off signal is input to the GATE terminal GATE, the first reset terminal RST1 and the second reset terminal RST 2.
As shown in fig. 2, in this stage, a high level is input to the GATE terminal GATE, the first reset terminal RST1, and the second reset terminal RST2, so that the first transistor M1, the second transistor M2, the third transistor M3, and the fourth transistor M4 are turned off, a conductive signal is input to the first signal terminal EM, the second signal terminal Sen, the fifth transistor M5, the sixth transistor M6, and the eighth transistor M8 are turned on, and the seventh transistor M7 is kept in an on state in the upper stage, so that the voltage of the light emitting unit 2 is input to the detection and adjustment unit 8, so that the detection and adjustment unit 8 detects and adjusts the voltage.
Specifically, the voltage of the light emitting unit 2 passes through the eighth transistor M8, the amplifier 91, the first analog-to-digital converter 92, the query subunit 93, the storage subunit 94, the second analog-to-digital converter 95, and finally reaches the DATA line terminal DATA. The amplifier 91 is mainly used for amplifying the voltage so as to make the detection of the voltage more accurate. The first analog-to-digital converter 92 performs analog-to-digital conversion of the amplified voltage. The inquiring subunit 93 inquires and adjusts the signal from the first analog-to-digital converter 92 (i.e., compares the actual voltage signal of the light emitting unit 2 with the aging voltage data of the preset light emitting unit 2 to obtain a corresponding output voltage difference value), and sends the corresponding output voltage difference value to the storing subunit 94, so that the storing subunit 94 stores the adjusted signal. The second analog-to-digital converter 95 again analog-to-digital converts the stored signal in the storage subunit 94 and sends it to the DATA line terminal DATA. The DATA line terminal DATA may be connected to a processing module such as a chip, where the processing module sends the final adjusted DATA voltage to the DATA line terminal DATA according to the signal of the DATA line (i.e., the signal converted by the second analog-to-digital converter 95 and the DATA voltage that the DATA line terminal DATA should originally provide). This stage can avoid uneven light emission due to aging of the light emitting unit 2 (i.e., the organic light emitting diode) to realize external compensation of the pixel driving circuit.
Example 2:
as shown in fig. 1 and 2, the present embodiment provides a display panel including a plurality of pixel driving circuits, wherein the pixel driving circuits are the pixel driving circuits in embodiment 1.
Since the time required for the pixel driving method is relatively short, the method can be performed in a blank area (blanking) between two frames during display. The pixel driving method may adjust the display voltages of the sub-pixels of a plurality of rows at a time, and preferably, the pixel driving method may adjust the display voltages of the sub-pixels of only one row at a time.
Specifically, the display device may be any product or component with a display function, such as an Organic Light Emitting Diode (OLED) display panel, electronic paper, mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator, etc.
It should be noted that in this document relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
Embodiments in accordance with the present invention, as described above, are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (8)
1. A pixel driving method, wherein the pixel driving method is based on a pixel driving circuit, comprising: the device comprises a driving unit, a light emitting unit, a storage unit, a reset unit, a light emitting control unit, a writing compensation unit and a detection adjustment unit;
the driving unit is used for driving the light-emitting unit to emit light in a display stage;
the first end of the storage unit is connected with a first voltage end, and the second end of the storage unit is connected with a first node;
the reset unit is used for controlling the voltage of the first node according to the second voltage terminal in a reset stage;
the write compensation unit is used for writing data signals and compensation data of a data line end to a first node through adjustment of the driving unit in a data write stage after the reset stage; the write compensation unit includes: a second transistor, the gate of which is connected to the gate terminal, the first electrode is connected to the second node, and the second electrode is connected to the data terminal; a third transistor having a gate connected to the gate terminal, a first electrode connected to the first node, and a second electrode connected to the third node;
the reset unit is used for inputting a second reset signal to the input end of the light-emitting unit according to the control of a second voltage end in a reset stage positioned after the data writing stage, and the voltage of the second reset signal is smaller than the voltage loaded by the input end of the light-emitting unit in the data writing stage;
the input end of the light-emitting unit is in a floating state in a transition stage after the reset stage so as to maintain loading of the second reset signal;
the light emission control unit is used for writing display current to the light emitting unit by controlling the driving unit in the display stage after the transition stage, wherein the display current is related to the data signal and the voltage of the first voltage terminal;
the detection and adjustment unit is used for adjusting the data signal of the data line end according to the display current in a detection and adjustment stage after the display stage is finished; the detection adjustment unit includes: an eighth transistor, the grid electrode of which is connected with the second signal end, and the first electrode of which is connected with the input end of the light-emitting unit; an amplifier having a first terminal connected to the second terminal of the eighth transistor and a second terminal connected to ground for amplifying the display current; the input end of the first analog-to-digital converter is connected with the third end of the amplifier and is used for performing analog-to-digital conversion on the amplified display current; the first end of the query subunit is connected with the output end of the first analog-to-digital converter and is used for adjusting signals from the first analog-to-digital converter; the first end of the storage subunit is connected with the second end of the query subunit, and the storage subunit is used for storing signals obtained after the adjustment of the query subunit; the input end of the second analog-to-digital converter is connected with the second end of the storage subunit, the output end of the second analog-to-digital converter is connected with the data line end, and the second analog-to-digital converter is used for performing analog-to-digital conversion on the signals stored by the storage subunit and transmitting the converted signals to the data line end;
the pixel driving method includes:
in a reset phase, the reset unit controls the voltage of the first node according to a second voltage terminal;
in the data writing stage, the writing compensation unit writes a data signal and compensation data of a data line end to a first node through adjustment of the driving unit;
in a reset stage, the reset unit inputs a second reset signal to the input end of the light-emitting unit according to the control of a second voltage end, wherein the voltage of the second reset signal is smaller than the voltage loaded by the input end of the light-emitting unit in the data writing stage;
in the transition stage, the input end of the light-emitting unit is in a floating state so as to maintain loading of the second reset signal;
in a display stage, the light emission control unit writes a display current to the light emission unit by controlling the driving unit, the magnitude of the display current being related to the data signal and the voltage of the first voltage terminal;
in the detection adjustment stage, the detection adjustment unit adjusts the data signal of the next frame of the data line end according to the display current.
2. The pixel driving method according to claim 1, wherein the reset unit includes:
the grid electrode of the first transistor is connected with the first reset end, the first electrode of the first transistor is connected with the first node, and the second electrode of the first transistor is connected with the second voltage end.
3. The pixel driving method according to claim 2, wherein the reset unit includes:
and the grid electrode of the fourth transistor is connected with the second reset end, the first electrode of the fourth transistor is connected with the second voltage end, and the second electrode of the fourth transistor is connected with the input end of the light-emitting unit.
4. A pixel driving method according to claim 3, wherein the light emission control unit comprises:
a fifth transistor, the grid of which is connected with the first signal end, the first electrode is connected with the first voltage end, and the second electrode is connected with the second node;
and the grid electrode of the sixth transistor is connected with the first signal end, the first electrode of the sixth transistor is connected with the third voltage end, and the second electrode of the sixth transistor is connected with the input end of the light-emitting unit.
5. The pixel driving method according to claim 4, wherein the driving unit includes:
and a seventh transistor, wherein the grid electrode of the seventh transistor is connected with the first node, the first electrode of the seventh transistor is connected with the second node, and the second electrode of the seventh transistor is connected with the third node.
6. The pixel driving method according to claim 5, wherein the storage unit includes:
and the first electrode of the storage capacitor is connected with the first voltage end, and the second electrode of the storage capacitor is connected with the first node.
7. The method of claim 6, wherein all transistors are N-type transistors; alternatively, all transistors are P-type transistors.
8. The pixel driving method according to claim 7, wherein the pixel driving method specifically comprises:
in the reset stage, a first reset signal is input to the second voltage end, a conduction signal is input to the first reset end, and a turn-off signal is input to the gate end, the second reset end, the first signal end and the second signal end;
in the data writing stage, a data signal is input to the data line end, a conduction signal is input to the gate line end, and a turn-off signal is input to the first reset end, the second reset end, the first signal end and the second signal end;
in the reset stage, a second reset signal is input to the second voltage end, a conduction signal is input to the second reset end, and a turn-off signal is input to the gate end, the first reset end, the first signal end and the second signal end;
in the display stage, a display voltage is input to the first voltage end, a conduction signal is input to the first signal end, and a turn-off signal is input to the gate end, the first reset end, the second reset end and the second signal end;
in the transition stage, a turn-off signal is input to the gate terminal, the first reset terminal, the second reset terminal, the first signal terminal and the second signal terminal;
in the detection and adjustment stage, a display voltage is input to the first voltage end, a conduction signal is input to the first signal end and the second signal end, and a turn-off signal is input to the gate end, the first reset end and the second reset end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910712309.6A CN110415644B (en) | 2019-08-02 | 2019-08-02 | Pixel driving circuit and method thereof, and display panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910712309.6A CN110415644B (en) | 2019-08-02 | 2019-08-02 | Pixel driving circuit and method thereof, and display panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110415644A CN110415644A (en) | 2019-11-05 |
| CN110415644B true CN110415644B (en) | 2023-06-30 |
Family
ID=68365594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910712309.6A Active CN110415644B (en) | 2019-08-02 | 2019-08-02 | Pixel driving circuit and method thereof, and display panel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110415644B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111312129A (en) * | 2020-02-28 | 2020-06-19 | 京东方科技集团股份有限公司 | Pixel circuit, light-emitting device aging detection and compensation method and display substrate |
| CN111261101A (en) * | 2020-02-28 | 2020-06-09 | 合肥京东方卓印科技有限公司 | Pixel circuit, driving method thereof and display panel |
| CN112201207B (en) * | 2020-09-30 | 2021-11-12 | 合肥维信诺科技有限公司 | Driving method of pixel circuit, pixel circuit and display device |
| CN114927089B (en) * | 2022-05-20 | 2024-03-05 | 京东方科技集团股份有限公司 | Driving circuit, display panel and electronic equipment |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236237B (en) * | 2013-04-26 | 2015-04-08 | 京东方科技集团股份有限公司 | Pixel unit circuit and compensating method of pixel unit circuit as well as display device |
| KR102103241B1 (en) * | 2013-12-26 | 2020-04-22 | 엘지디스플레이 주식회사 | Organic light emitting diode display device and method of sensing driving characteristics thereof |
| CN104700761B (en) * | 2015-04-03 | 2017-08-29 | 京东方科技集团股份有限公司 | One kind detection circuit and its detection method and drive system |
| CN106297645A (en) * | 2015-05-15 | 2017-01-04 | 上海和辉光电有限公司 | Pixel-driving circuit and display device |
| CN106504707B (en) * | 2016-10-14 | 2018-06-01 | 深圳市华星光电技术有限公司 | OLED pixel mixed compensation circuit and mixed compensation method |
| KR102487500B1 (en) * | 2018-01-02 | 2023-01-12 | 삼성디스플레이 주식회사 | Display device |
| CN109545145B (en) * | 2019-01-02 | 2020-07-28 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display device |
| CN110047434B (en) * | 2019-04-08 | 2021-08-03 | 深圳市华星光电半导体显示技术有限公司 | Compensation system and compensation method of organic light-emitting device |
-
2019
- 2019-08-02 CN CN201910712309.6A patent/CN110415644B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110415644A (en) | 2019-11-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110415644B (en) | Pixel driving circuit and method thereof, and display panel | |
| US11341915B2 (en) | Gamma voltage compensation circuit and gamma voltage compensation method, source driver, and display panel | |
| US20210233469A1 (en) | Pixel driving circuit and method, and display panel | |
| CN109545145B (en) | Pixel circuit, driving method thereof and display device | |
| CN109493794B (en) | Pixel circuit, pixel driving method and display device | |
| US10083658B2 (en) | Pixel circuits with a compensation module and drive methods thereof, and related devices | |
| CN109509428B (en) | Pixel driving circuit, pixel driving method and display device | |
| US8368678B2 (en) | Pixel circuit, display apparatus, and pixel circuit drive control method | |
| US9799268B2 (en) | Active matrix organic light-emitting diode (AMOLED) pixel driving circuit, array substrate and display apparatus | |
| US20230410729A1 (en) | Pixel circuit, driving method of pixel circuit, and display panel | |
| CN110062943B (en) | Pixel circuit, driving method thereof and display device | |
| US11875742B2 (en) | Display drive circuit and drive method thereof, and display device | |
| US20210233470A1 (en) | Pixel driving circuit, display panel and driving method thereof, and display device | |
| CN114333702B (en) | Display panel and driving circuit thereof | |
| CN110544458B (en) | Pixel circuit, driving method thereof and display device | |
| US11238789B2 (en) | Pixel circuit having a data line for sensing threshold and mobility characteristics of the circuit | |
| CN111462698A (en) | Pixel driving circuit, display panel and display device | |
| CN113593475A (en) | Pixel circuit, driving method and display device | |
| CN110264947B (en) | Pixel circuit, driving method and display device | |
| US11961470B2 (en) | Sensing circuit and correction method thereof, pixel driving module and sensing method thereof, and display apparatus | |
| CN108470541B (en) | Pixel circuit, driving method thereof, display panel and display device | |
| CN111833815B (en) | Pixel driving circuit and method, display panel and driving method | |
| CN109256088B (en) | Pixel circuit, display panel, display device and pixel driving method | |
| CN217386638U (en) | Pixel circuit, display panel and electronic device | |
| CN111785213B (en) | Pixel driving circuit and method and display panel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |