Liquid Crystal Display Black Image Insertion Control
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Solution Overview
Problem
Existing black insertion drive methods for liquid crystal display devices improve moving image performance but reduce contrast ratio and increase power consumption when increasing the black image display period, as they maintain a constant ratio of black image to video display periods regardless of image brightness.
Innovation Solution
A method and device that dynamically adjust the ratio of black image to video display periods based on image brightness within a frame, using a black image insertion control circuit to alter the position of scan lines supplied with black image selection voltage, thereby optimizing moving image performance while maintaining luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the black image display period is increased to improve moving image performance, then the moving image quality is improved, but the contrast ratio is reduced and power consumption is increased
Solution Approach 1:
The patent applies dynamics by making the black image insertion ratio adjustable rather than fixed. The control circuit dynamically changes the ratio of black image display periods to video display periods based on image brightness conditions, allowing optimization of moving image performance while maintaining contrast ratio and controlling power consumption under different display scenarios
Solution Approach 2:
The patent changes the parameter of black image display period ratio based on image brightness. By detecting image brightness and adjusting the black image insertion ratio accordingly, the system optimizes moving image performance while preventing excessive contrast ratio reduction and power consumption increase that would occur with a constantly high black image ratio
2Reliability
If the black image display period is increased to improve moving image performance, then the moving image quality is improved, but power consumption is increased
Solution Approach 1:
The system dynamically adjusts the black image insertion ratio based on actual image brightness conditions. When images are brighter, a lower black image ratio is used, reducing power consumption. When images are darker, a higher black image ratio is used to maintain moving image performance, optimizing energy usage across different display scenarios
Solution Approach 2:
The patent changes the black image display period parameter adaptively based on image brightness. By adjusting this parameter dynamically, the system achieves good moving image performance while avoiding the excessive power consumption that would result from maintaining a constantly high black image ratio
3Device complexity
If a constant ratio of black image to video display periods is maintained, then the drive method is simple, but moving image performance cannot be optimized under different brightness conditions
Solution Approach 1:
The patent introduces dynamic adjustment capability to the black image insertion ratio based on image brightness detection. This allows the system to optimize moving image performance under different brightness conditions while adding only moderate complexity through a control circuit that automatically adjusts parameters without requiring complex user intervention
Solution Approach 2:
The system changes the black image display period ratio parameter based on detected image brightness. This adaptive parameter change enables optimized moving image performance across varying brightness conditions while maintaining relatively simple operation through automatic control
Data Source
AI summary
To change a proportion of a black image display period based on an image brightness in one frame, improving a moving image performance while suppressing a reduction in luminance. A method of driving a liquid crystal display device which includes a liquid crystal display panel having plural pixels, and displays a black image after displaying a video in each pixel, includes: when taking a period for which the video is displayed as a video display period, and a period for which the black image is displayed as a black image display period, based on an image brightness in one frame, changing a ratio of the black image display period to the video display period.