LCD Video Processing Noise Detection and Overdriving

Solution Overview

Problem

Liquid crystal display (LCD) devices suffer from video quality deterioration due to overdriving actions, which cause motion blur and color inversion, especially when dealing with quantization errors and noise amplification during data processing.

Innovation Solution

A method and apparatus for processing video data in LCD devices that detects noise by comparing current and previous frames, removes noise, and selects overdriving data using a lookup table to prevent quality deterioration, transforming gray level data into brightness and chrominance data to prevent color inversion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If overdriving method is applied to improve liquid crystal response speed, then response speed is improved, but video quality deteriorates due to noise amplification and color inversion

Engineering Contradiction:

Improveliquid crystal response speedVSAvoidvideo quality

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent applies local quality by differentiating the treatment of brightness and chrominance components. Overdriving is selectively applied only to brightness data (Y component) while chrominance data (U, V components) are processed separately without overdriving. This localized application prevents color inversion and noise amplification in chrominance channels while maintaining response speed improvement in brightness channels.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the video data processing into separate brightness and chrominance processing paths. The brightness data undergoes overdriving treatment to improve response speed, while chrominance data follows a separate processing path that avoids overdriving. This segmentation resolves the contradiction by applying overdriving only where it benefits response speed without compromising color accuracy.

Inventive Principle:

Principle #1Segmentation

2Speed

If overdriving circuit independently changes red, green, and blue data to overdriving data, then response speed improves, but color inversion occurs resulting in video quality deterioration

Engineering Contradiction:

Improveresponse speedVSAvoidcolor accuracy

Core Design Contradiction:

SpeedVSEase of manufacture

Solution Approach 1:

The patent applies local quality by differentiating the treatment of brightness and chrominance components. Overdriving is selectively applied only to brightness data (Y component) while chrominance data (U, V components) are processed separately without overdriving. This localized application prevents color inversion and noise amplification in chrominance channels while maintaining response speed improvement in brightness channels.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the video data processing into separate brightness and chrominance processing paths. The brightness data undergoes overdriving treatment to improve response speed, while chrominance data follows a separate processing path that avoids overdriving. This segmentation resolves the contradiction by applying overdriving only where it benefits response speed without compromising color accuracy.

Inventive Principle:

Principle #1Segmentation

3Productivity

If quantization error of more than one gray level occurs in quantization process, then analog broadcast signal is converted to digital data, but components of quantization error are amplified by overdriving circuit appearing as noise on screen

Engineering Contradiction:

Improvesignal conversion efficiencyVSAvoidnoise

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating the treatment of brightness and chrominance components. Overdriving is selectively applied only to brightness data (Y component) while chrominance data (U, V components) are processed separately without overdriving. This localized application prevents color inversion and noise amplification in chrominance channels while maintaining response speed improvement in brightness channels.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the video data processing into separate brightness and chrominance processing paths. The brightness data undergoes overdriving treatment to improve response speed, while chrominance data follows a separate processing path that avoids overdriving. This segmentation resolves the contradiction by applying overdriving only where it benefits response speed without compromising color accuracy.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8228437B2Method and apparatus for processing video data of liquid crystal display device

Publication Date: 2012.07.24 LG DISPLAY CO LTD

AI summary

A video processing method and apparatus for a liquid crystal display (LCD) device is disclosed. The video processing method for the LCD device includes detecting noise by comparing data of a previous frame with data of a current frame, if the noise is detected, removing the noise from the current frame data, and outputting the resultant current frame data having no noise together with the previous frame data, and comparing the previous frame data with the resultant current frame data having no noise in a lookup table, selecting overdriving data corresponding to the comparison result, and outputting the selected overdriving data.