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

Gamma correction circuit, correction method, source electrode driving circuit and display panel

A gamma correction, circuit technology, used in static indicators, instruments, etc., to solve problems such as the inability to eliminate the influence of operational amplifiers

Active Publication Date: 2019-05-31
BOE TECH GRP CO LTD +1
View PDF11 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a gamma correction circuit, a correction method, a source drive circuit and a display panel, which are used to solve the problem in the related art that the influence of the offset voltage of the operational amplifier on the gamma voltage cannot be eliminated from the circuit structure

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
  • Gamma correction circuit, correction method, source electrode driving circuit and display panel
  • Gamma correction circuit, correction method, source electrode driving circuit and display panel
  • Gamma correction circuit, correction method, source electrode driving circuit and display panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] In the related art, the gamma correction circuit such as figure 1 As shown, the Input input voltage is V, the K switch in the circuit is closed, the K’ switch in the circuit is open, and the A1 terminal is used as the non-inverting input terminal, the resulting Output output voltage is V+△V due to the imbalance. When the K switch in the circuit is turned off, the K' switch in the circuit is closed, and the A2 terminal is used as the non-inverting input terminal, the resulting output voltage due to the offset is V-△V. The currently used driving method is to switch the polarity of A1 and A2 once per frame. This method eliminates the offset voltage by neutralizing the brightness of the screen, rather than eliminating it from the root of the circuit. It is easy to cause flickering and split screens when testing the screen.

[0043] Specifically, taking the liquid crystal display panel using the column inversion driving method to test the picture as an example, if the A1 ter...

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 discloses a gamma correction circuit, a correction method, a source driving circuit and a display panel. The gamma correction circuit comprises a first operational amplifier and a secondoperational amplifier, through the arrangement of the first operational amplifier and the second operational amplifier, the first output end is connected with the fourth input end, so that the influence of the offset voltage of the operational amplifier on the gamma voltage is eliminated in operation, the influence of the offset voltage is eliminated in the circuit structure, and the quality of adisplay picture is improved.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a gamma correction circuit, a correction method, a source drive circuit and a display panel. Background technique [0002] Currently, the output terminal of the gamma circuit in the source driver circuit used in the liquid crystal display panel needs to be connected to an operational amplifier. Due to the internal structure of the operational amplifier, there is a problem of voltage imbalance at the input terminal of the operational amplifier. [0003] In the related technology, the offset voltage of each input terminal of the operational amplifier is neutralized by switching the positive and negative polarity of the input terminal of the operational amplifier once in one frame, that is, the method is to neutralize the offset voltage by adjusting the brightness of the screen, rather than eliminating it fundamentally from the circuit. When testing the screen, it is easy 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
IPC IPC(8): G09G3/36
Inventor 张英豪路永全王谦张夺张旭茹江峰张炜檬张彦杰孙冬雪
Owner BOE TECH GRP CO LTD