Liquid Crystal Display Adjacent Gradation Correction for Response Speed
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Solution Overview
Problem
Liquid crystal display devices face a decrease in response speed due to lateral electric fields between adjacent sub-pixels, particularly when displaying specific colors, which is not adequately addressed by existing methods such as overshoot driving or those described in Patent Document 1, and can occur in both overshoot driving and non-overshoot driving scenarios.
Innovation Solution
An active matrix-type liquid crystal display device with an adjacent gradation correcting unit that adjusts sub-pixel gradations to minimize voltage differences between adjacent sub-pixels, using look-up tables to determine correction values based on the target sub-pixel's gradation and its surrounding sub-pixels' positions, thereby reducing lateral electric fields and improving response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If overshoot driving is applied to improve response speed, then response speed is improved, but lateral electric fields occur between adjacent sub-pixels causing response speed to decrease
Solution Approach 1:
The patent applies different gradation correction strategies to different sub-pixels based on their spatial relationships. When a sub-pixel has high gradation, adjacent sub-pixels with low gradation are corrected to reduce the voltage difference, thereby suppressing lateral electric fields locally without affecting the overall overshoot driving effect.
Solution Approach 2:
The patent modifies the voltage gradation parameter dynamically based on the spatial relationship between sub-pixels. By adjusting the gradation values of adjacent sub-pixels according to their position relative to high-gradation sub-pixels, the system optimizes the balance between response speed and lateral electric field suppression.
2Speed
If overshoot driving is applied to increase liquid crystal molecule movement speed, then response speed is improved, but display quality deteriorates due to lateral electric fields
Solution Approach 1:
The patent applies different gradation correction strategies to different sub-pixels based on their spatial relationships. When a sub-pixel has high gradation, adjacent sub-pixels with low gradation are corrected to reduce the voltage difference, thereby suppressing lateral electric fields locally without affecting the overall overshoot driving effect.
Solution Approach 2:
The patent modifies the voltage gradation parameter dynamically based on the spatial relationship between sub-pixels. By adjusting the gradation values of adjacent sub-pixels according to their position relative to high-gradation sub-pixels, the system optimizes the balance between response speed and lateral electric field suppression.
3Object-generated harmful factors
If gradation difference between adjacent sub-pixels is reduced, then lateral electric fields are suppressed, but response speed may decrease
Solution Approach 1:
The patent applies different gradation correction strategies to different sub-pixels based on their spatial relationships. When a sub-pixel has high gradation, adjacent sub-pixels with low gradation are corrected to reduce the voltage difference, thereby suppressing lateral electric fields locally without affecting the overall overshoot driving effect.
Solution Approach 2:
The patent applies gradation correction selectively only to adjacent sub-pixels that would generate significant lateral electric fields, rather than uniformly reducing gradation differences across all sub-pixels. This partial correction approach suppresses harmful lateral electric fields while preserving the overall response speed enhancement from overshoot driving.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses lateral electric fields and enhances response speed when displaying specific colors without compromising white or black display performance, improving the overall display speed and efficiency of the liquid crystal panel.
Implementation Method 1
a liquid crystal layer 92 is sandwiched between two glass substrates 91a and 91b... applying, to liquid crystals, a voltage corresponding to a gradation
Implementation Method 2
lateral electric fields 90 occur between the sub-pixels 96r and 96g, and between the sub-pixels 96g and 96b... a part of the liquid crystal molecules (not depicted) within the liquid crystal layer 92 are inclined in horizontal direction, instead of vertical direction
Data Source
AI summary
An adjacent gradation correcting unit 11 performs processing for correcting gradations of sub-pixels to a video signal X2 after overshoot processing. When determining that a gradation of a target sub-pixel corresponds to a higher liquid crystal application voltage than that of a gradation of an adjacent sub-pixel, and that a gradation difference between the target sub-pixel and the adjacent sub-pixel is large, the adjacent gradation correcting unit 11 corrects the gradation of the adjacent sub-pixel so as to make the gradation difference smaller. In driving a liquid crystal panel 1, a video signal X3 after correction obtained by the adjacent gradation correcting unit 11 is used. With this, when displaying a specific color, such as red, green, or blue, it is possible to suppress a lateral electric field occurring between two sub-pixels that are adjacent to each other, and to improve response speed of the liquid crystal panel 1.