Unlock instant, AI-driven research and patent intelligence for your innovation.

Compensation pixel circuit and display device

A technology for compensating pixels and circuits, applied to static indicators, instruments, etc., can solve problems such as threshold voltage offset, large load, and affecting display effects, and achieve the effect of compensating OLED current deviation

Active Publication Date: 2017-03-08
BOE TECH GRP CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the field of AMOLED display, especially in the design of large-size substrates, there are problems with the uniformity and stability of TFTs in the production process of backplane TFTs (Thin Film Transistors, thin film transistors). On the one hand, there will be differences between different TFTs. Threshold voltage shift, on the other hand there will be TFT stability degradation after long time on bias
These problems make the driving OLED current uneven and stable, affecting the display effect
[0004] In the prior art, there are many AMOLED compensation circuit designs that only consider the problem of threshold voltage shift, but these designs have ignored a problem: with the trend of increasing the size of AMOLED, the load of the gate signal line will also increase. It is getting bigger and bigger, which will lead to voltage attenuation on the gate signal line, which will affect the current uniformity of the display area.
Such problems will make the OLED luminescence uneven and reduce the display effect

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Compensation pixel circuit and display device
  • Compensation pixel circuit and display device
  • Compensation pixel circuit and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An embodiment of the present invention proposes a compensation pixel circuit, see figure 1 , the circuit includes an organic light emitting diode D1 and a driving transistor M1, the first end of the driving transistor M1 is connected to the anode of the organic light emitting diode D1 through a switch module, and the compensation pixel circuit further includes:

[0035] A reset module, including a capacitor C1 whose first terminal is connected to the gate of the driving transistor M1, the reset module is used to discharge the gate of the driving transistor M1, so that the gate voltage drops to the organic light emitting diode D1 The size of the threshold voltage;

[0036] The data voltage writing module is used to connect the data voltage VData to the gate of the drive transistor M1 after the gate voltage of the drive transistor M1 is discharged to reduce the gate voltage to the threshold voltage of the organic light emitting diode D1. second end;

[0037] a light emi...

Embodiment 2

[0065] Based on the same inventive concept, an embodiment of the present invention also provides a display device, which includes any compensation pixel circuit described above. The display device can be any product or component with a display function such as an OLED panel, a mobile phone, a tablet computer, a television set, a monitor, a notebook computer, a digital photo frame, a navigator, and the like.

[0066] When the circuit is designed as a pixel unit in the array substrate, since the signal lines G1 and EM2 are signals for controlling data voltage writing, one of G1 and EM2 can be connected to the corresponding On the gate line of this row, the other directly takes its inversion signal. As for the signal lines EM1 and G2, they are used to reset the gate voltage, and thus can be realized by designing corresponding reset switch signal lines, or can be obtained through certain logic circuit operations according to the gate line signals.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention involves the field of LCD display manufacturing, providing a compensation pixel circuit and display device.For the uneven luminous light caused by the existing technology in the existing technology, the stability of the driving transistor decreased after a long turn on the partial pressure, and the influence of the current uniformity and stability of the display area of the display area.The reset module, the data voltage writing module, the light emitting control module, and the switch module are added to the top, which mainly realizes the reset of the driving transistor gate voltage, and the compensation of the driver's transistor threshold voltage.This method not only has the function of compensation threshold voltage offset, but also has the function of resetting the gate voltage of the driving transistor, which greatly reduces the effects of the signal between the frame and the frame.

Description

technical field [0001] The invention relates to the field of liquid crystal display manufacture, and specifically provides a compensation pixel circuit and a display device. Background technique [0002] Active Matrix / Organic Light Emitting Diode (AMOLED) display is a display technology used in TVs and mobile devices. It is sensitive to power consumption due to its low power consumption, low cost, and large size. It has broad application prospects in portable electronic devices. [0003] At present, in the field of AMOLED display, especially in the design of large-size substrates, there are problems with the uniformity and stability of TFTs in the production process of backplane TFTs (Thin Film Transistors, thin film transistors). On the one hand, there will be differences between different TFTs. Threshold voltage shift, and on the other hand, there will be a decrease in TFT stability after the bias is turned on for a long time. These problems make the driving current of t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3233
CPCG09G2230/00G09G3/3233G09G2300/0819G09G2300/0842G09G2300/0861G09G2320/045G09G3/3225G09G2320/0233G09G2310/061
Inventor 马占洁
Owner BOE TECH GRP CO LTD