CN110379369A - A kind of pixel compensation circuit and driving method - Google Patents

A kind of pixel compensation circuit and driving method Download PDF

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Publication number
CN110379369A
CN110379369A CN201910446647.XA CN201910446647A CN110379369A CN 110379369 A CN110379369 A CN 110379369A CN 201910446647 A CN201910446647 A CN 201910446647A CN 110379369 A CN110379369 A CN 110379369A
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China
Prior art keywords
connect
grid
voltage
driving
source electrode
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CN201910446647.XA
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Chinese (zh)
Inventor
贾浩
罗敬凯
曹尚操
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福建华佳彩有限公司
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Priority to CN201910446647.XA priority Critical patent/CN110379369A/en
Publication of CN110379369A publication Critical patent/CN110379369A/en

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3225Control 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

Abstract

A kind of pixel compensation circuit and driving method, wherein circuit includes thin film transistor (TFT) T1, T2, T3, T4, T5, and the source electrode of T1 described in capacitor is connect with driving DC voltage VDD, and grid is connect with scanning drive signal Scan1, and drain electrode is connect with the source electrode of T4;The grid of the T2 is connect with scanning drive signal Scan2, and source electrode is connect with driving signal DATA, and drain electrode is connect with one end of the grid of T4 and capacitor C1;The grid of the T3 is connect with scanning signal Scan2, one end connection of the other end and C2 of source electrode and C1, grounded drain;The drain electrode of the T4 is connect with the anode of the other end of C2 and light emitting diode, and the grid of the T5 is connect with scanning drive signal Scan3, the cathode connection of source electrode and light emitting diode.It is different from the prior art, above-mentioned technical proposal solves VTH, VSS by setting pixel-driving circuit and design driven method, brightness disproportionation problem caused by the bad factor variations such as VDD, VOLED and holding VDD input fixed value voltage to save power consumption and reduce the problem of IC pin number.

Description

A kind of pixel compensation circuit and driving method

Technical field

The present invention relates to display panel design field more particularly to a kind of panel designed holders of stable pixel display effect Structure.

Background technique

AMOLED panel is influenced by the problems such as processing procedure and aging, the threshold value electricity of thin film transistor (TFT) (TFT) in each picture element It presses (VTH) different, inputs the difference of electric current caused by identical voltage, and the bad factor such as VDD, VSS, VOLED also will affect Electric current when shining to OLED causes panel luminance uneven;VDD signal in Pixel circuit when generating variation in a certain stage, Changing to a fixed value voltage from low-voltage will increase power consumption, and by VDD signal when moment is changed, need one ICsignalpin is controlled, and ICpin number is caused to increase.

Therefore, VTH, VDD, VSS how are eliminated, the influence of the bad factor pair electric current such as VOLED makes glow current and writes The VDATA entered is related, reaches compensation effect, and how to make VDD signal keep direct current come save power consumption and reduce ICpin number, It is an important topic.

Summary of the invention

For this reason, it may be necessary to provide a kind of circuit and driving method for being able to solve pixel display brightness unevenness problem.

To achieve the above object, inventor has developed a kind of pixel compensation circuit, including thin film transistor (TFT) T1, T2, T3, The source electrode of T4, T5, T1 described in capacitor are connect with driving DC voltage VDD, and grid is connect with scanning drive signal Scan1, drain electrode It is connect with the source electrode of T4;The grid of the T2 is connect with scanning drive signal Scan2, and source electrode is connect with driving signal DATA, leakage One end of the grid and capacitor C1 of pole and T4 connects;The grid of the T3 is connect with scanning signal Scan2, and source electrode and C1's is another End is connected with one end of C2, grounded drain;The drain electrode of the T4 is connect with the anode of the other end of C2 and light emitting diode, described The grid of T5 is connect with scanning drive signal Scan3, the cathode connection of source electrode and light emitting diode.

Specifically, the grounded drain of the T3.

Specifically, the grounded drain of the T5.

A kind of pixel compensation circuit drive method includes the following steps suitable for above-mentioned pixel compensation circuit,

In reset phase, scanning drive signal Scan1, Scan2, Scan3 are set as high level, and driving signal DATA is low Voltage,

Compensated stage, scanning drive signal Scan1, Scan2 are high level, and Scan3 is low level, and driving signal DATA is Low-voltage,

Write phase, scanning drive signal Scan2 are high level, and Scan1, Scan3 are low level, and driving signal DATA is High voltage,

Light emitting phase, scanning drive signal Scan1, Scan3 are high level, and Scan2 is low level, and driving signal DATA is Low-voltage.

Specifically, the low-voltage of driving signal DATA is benchmark voltage, value Vref.

Specifically, the high voltage of driving signal DATA is that benchmark voltage adds write-in voltage, value Vref+Vdata.

It is different from the prior art, above-mentioned technical proposal provides one kind by setting pixel-driving circuit or driving method Low-power consumption compensation circuit solves VTH, VSS, VDD, brightness disproportionation problem and holding caused by the bad factor variations such as VOLED VDD inputs fixed value voltage to save power consumption and reduce the problem of ICpin number.

Detailed description of the invention

Fig. 1 is pixel compensation circuit diagram of the present invention;

Fig. 2 is pixel compensation driving signal schematic diagram of the present invention;

Fig. 3 is reset phase circuit diagram of the present invention;

Fig. 4 is compensated stage circuit diagram of the present invention;

Fig. 5 is write phase circuit diagram of the present invention;

Fig. 6 is light emitting phase circuit diagram of the present invention.

Specific embodiment

Technology contents, construction feature, the objects and the effects for detailed description technical solution, below in conjunction with specific reality It applies example and attached drawing is cooperated to be explained in detail.

In the technical method to be illustrated herein, as shown in Figure 1, we provide a kind of pixel compensation circuit, including thin The source electrode of film transistor T1, T2, T3, T4, T5, T1 described in capacitor are connect with driving DC voltage VDD, and grid and turntable driving are believed Number Scan1 connection, drain electrode are connect with the source electrode of T4;The grid of the T2 is connect with scanning drive signal Scan2, source electrode and driving Signal DATA connection, drain electrode are connect with one end of the grid of T4 and capacitor C1;The grid and scanning signal Scan2 of the T3 connects It connects, one end connection of the other end and C2 of source electrode and C1, grounded drain;The drain electrode of the T4 and the other end and light-emitting diodes of C2 The anode connection of pipe, the grid of the T5 are connect with scanning drive signal Scan3, the cathode connection of source electrode and light emitting diode. The grounded drain of T3 and T5 meets voltage VSS.Above-mentioned light emitting diode can be the OLED light emitting pixel of panel, pass through above-mentioned electricity Road design, the present invention program are capable of providing a kind of novel low-power consumption compensation circuit.To provide better frame for Display panel Structure.

In order to better use pixel compensation circuit, we also introduce a kind of pixel compensation circuit drive method, are suitable for Above-mentioned pixel compensation circuit includes such as next stage, reset phase (reset), compensated stage (comp), write-in as shown in Figure 2 Stage (datain), light emitting phase (emission).

In reset phase, scanning drive signal Scan1, Scan2, Scan3 are set as high level, and driving signal DATA is low Voltage,

Compensated stage, scanning drive signal Scan1, Scan2 are high level, and Scan3 is low level, and driving signal DATA is Low-voltage,

Write phase, scanning drive signal Scan2 are high level, and Scan1, Scan3 are low level, and driving signal DATA is High voltage,

Light emitting phase, scanning drive signal Scan1, Scan3 are high level, and Scan2 is low level, and driving signal DATA is Low-voltage.

Specifically, the low-voltage of driving signal DATA is benchmark voltage, value Vref.

Specifically, the high voltage of driving signal DATA is that benchmark voltage adds write-in voltage, value Vref+Vdata.

Operational process is described in detail as follows, as shown in figure 3, the Reset stage, high voltage is written in Scan2, and T2, T3 are beaten It opens, VREF voltage, VA=VREF is written in DATA signal;VC=VSS;High voltage is written in Scan3 and Scan1, and T5 and T1 are opened, hair The of short duration conducting of optical diode, B point are Reset, VB=VOLED+VSS.

As shown in figure 4, compensated stage, high voltage is written in Scan1, and low-voltage is written in Scan3, and T1 is opened, and T5 is closed, VDD When write-in makes B point voltage be increased to VREF-VTH, T4 is closed, at this time VB=VREF-VTH, i.e. compensation a to VTH;VA and VC It remains unchanged, i.e. VA=VREF, VC=VSS.

As shown in figure 5, Data write phase, low-voltage is written in Scan1, and T1 is closed, and high voltage, T2 and T3 is written in Scan2 It opens, VA=VREF+VDATA, VC are maintained at VSS voltage, i.e. VC=VSS, and due to the effect of capacitor between BC, B point voltage is kept It is constant, i.e. VB=VREF-VTH.

As shown in fig. 6, high voltage is written in light emitting phase, Scan1 and scan3, T1 and T5 are opened, and low-voltage is written in Scan2, T2 and T3 is closed, LEDs ON, VB=VOLED+VSS, due to the effect of capacitor between BC, VC=VSS+VOLED+VSS- (VREF-VTH), since the capacitor between AC acts on,

VA=VDATA+VOLED+VSS+VTH, then VGS=VA-VB=VDATA+VTH, substitutes into saturation region current formula IOLED=1/2 μ nCOXW/L (VGS-VTH) 2 obtains IOLED=1/2 μ nCOXW/L (VDATA) 2, and (note μ n is field effect mobility Rate, COX are the capacitive dielectric layer of unit area;W/L is TFT channel width than length).

Design scheme of the invention can finally reach it is following the utility model has the advantages that

(1) VTH that can compensate for DrivingTFT, influences electric current by VTH, and making panel, picture brightness is uniform everywhere.

(2) OLED glow current is only related with VDATA, considerably increases the stability of OLED glow current.

(2) it is controlled with a TFT and is Reset to B point, the function that VDD is flushed to a fixed value voltage from low-voltage can be saved Consumption.

(4) VDD keeps a definite value that can compensate work for circuit, controls without IC VDD signal, reduces ICpin number., reached purpose of design.

It should be noted that being not intended to limit although the various embodiments described above have been described herein Scope of patent protection of the invention.Therefore, it based on innovative idea of the invention, change that embodiment described herein is carried out and is repaired Change, or using equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it directly or indirectly will be with Upper technical solution is used in other related technical areas, is included within scope of patent protection of the invention.

Claims (6)

1. a kind of pixel compensation circuit, which is characterized in that including thin film transistor (TFT) T1, T2, T3, T4, T5, the source of T1 described in capacitor Pole is connect with driving DC voltage VDD, and grid is connect with scanning drive signal Scan1, and drain electrode is connect with the source electrode of T4;The T2 Grid connect with scanning drive signal Scan2, source electrode is connect with driving signal DATA, drain electrode and the grid of T4 and capacitor C1's One end connection;The grid of the T3 is connect with scanning signal Scan2, one end connection of the other end and C2 of source electrode and C1, drain electrode Ground connection;The drain electrode of the T4 is connect with the anode of the other end of C2 and light emitting diode, and the grid and turntable driving of the T5 is believed The cathode of number Scan3 connection, source electrode and light emitting diode connects.
2. pixel compensation circuit according to claim 1, which is characterized in that the grounded drain of the T3.
3. pixel compensation circuit according to claim 1, which is characterized in that the grounded drain of the T5.
4. a kind of pixel compensation circuit drive method is suitable for the described in any item pixel compensation circuits of claim 1-3, special Sign is, includes the following steps,
In reset phase, scanning drive signal Scan1, Scan2, Scan3 are set as high level, and driving signal DATA is low electricity Pressure,
Compensated stage, scanning drive signal Scan1, Scan2 are high level, and Scan3 is low level, and driving signal DATA is low electricity Pressure,
Write phase, scanning drive signal Scan2 are high level, and Scan1, Scan3 are low level, and driving signal DATA is high electricity Pressure,
Light emitting phase, scanning drive signal Scan1, Scan3 are high level, and Scan2 is low level, and driving signal DATA is low electricity Pressure.
5. pixel compensation circuit drive method according to claim 4, which is characterized in that the low-voltage of driving signal DATA For benchmark voltage, value Vref.
6. pixel compensation circuit drive method according to claim 4, which is characterized in that the high voltage of driving signal DATA Add write-in voltage, value Vref+Vdata for benchmark voltage.
CN201910446647.XA 2019-05-27 2019-05-27 A kind of pixel compensation circuit and driving method CN110379369A (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8284136B2 (en) * 2010-01-05 2012-10-09 Samsung Display Co., Ltd. Pixel circuit, organic light emitting display, and driving method thereof
CN104700778A (en) * 2015-03-27 2015-06-10 深圳市华星光电技术有限公司 AMOLED (Active Matrix/Organic Light Emitting Diode) pixel driving circuit and pixel driving method
CN105096819A (en) * 2015-04-21 2015-11-25 北京大学深圳研究生院 Display apparatus and pixel circuit thereof
CN105280136A (en) * 2014-07-10 2016-01-27 信利半导体有限公司 AMOLED pixel circuit and driving method thereof
US20160071456A1 (en) * 2011-10-18 2016-03-10 Seiko Epson Corporation Electro-optical device having pixel circuit and driving circuit, driving method of electro-optical device and electronic apparatus
CN104008726B (en) * 2014-05-20 2016-05-04 华南理工大学 The image element circuit of active organic electroluminescent display and driving method thereof
CN107507563A (en) * 2017-09-04 2017-12-22 深圳市华星光电半导体显示技术有限公司 OLED pixel drive circuit and image element driving method
CN109192139A (en) * 2018-09-26 2019-01-11 福建华佳彩有限公司 A kind of pixel compensation circuit
CN109410835A (en) * 2018-12-04 2019-03-01 福建华佳彩有限公司 A kind of novel OLED drive

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8284136B2 (en) * 2010-01-05 2012-10-09 Samsung Display Co., Ltd. Pixel circuit, organic light emitting display, and driving method thereof
US20160071456A1 (en) * 2011-10-18 2016-03-10 Seiko Epson Corporation Electro-optical device having pixel circuit and driving circuit, driving method of electro-optical device and electronic apparatus
CN104008726B (en) * 2014-05-20 2016-05-04 华南理工大学 The image element circuit of active organic electroluminescent display and driving method thereof
CN105280136A (en) * 2014-07-10 2016-01-27 信利半导体有限公司 AMOLED pixel circuit and driving method thereof
CN104700778A (en) * 2015-03-27 2015-06-10 深圳市华星光电技术有限公司 AMOLED (Active Matrix/Organic Light Emitting Diode) pixel driving circuit and pixel driving method
CN105096819A (en) * 2015-04-21 2015-11-25 北京大学深圳研究生院 Display apparatus and pixel circuit thereof
CN107507563A (en) * 2017-09-04 2017-12-22 深圳市华星光电半导体显示技术有限公司 OLED pixel drive circuit and image element driving method
CN109192139A (en) * 2018-09-26 2019-01-11 福建华佳彩有限公司 A kind of pixel compensation circuit
CN109410835A (en) * 2018-12-04 2019-03-01 福建华佳彩有限公司 A kind of novel OLED drive

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