Liquid Crystal Drive Apparatus Disclination Management
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Solution Overview
Problem
Existing liquid crystal drive methods suffer from noticeable dark lines due to disclination, which degrade image quality, as they fail to effectively manage the overlap of ON and OFF periods between adjacent pixels, leading to decreased lightness and contrast.
Innovation Solution
A liquid crystal drive apparatus that produces first and second frame image data with controlled voltage application in sub-frame periods, ensuring a tone difference of 20% or less between adjacent pixels, and uses a gain circuit to alternately apply different gains to input frame data to shift the positions of disclination, thereby reducing its impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a digital drive method with sub-frame periods is used to control lightness, then tone control precision is improved, but disclination occurs between adjacent pixels causing dark lines and decreased lightness
Solution Approach 1:
The patent divides the B sub-frame period into multiple divided sub-frame periods (1SF to 10SF), each with temporal weights of 8. This segmentation allows independent control of voltage application in smaller time units, enabling the system to avoid long overlapping ON/OFF periods between adjacent pixels that cause disclination, while maintaining precise tone control through the segmented structure.
2Device complexity
If long sub-frame periods are used to reduce the number of control periods, then device complexity is reduced, but the overlap period between ON and OFF states in adjacent pixels increases causing noticeable dark lines
Solution Approach 1:
The B sub-frame period is segmented into 10 divided sub-frame periods (1SF to 10SF), each with temporal weight of 8. This segmentation reduces the maximum continuous ON/OFF overlap period from the original long duration to at most one divided sub-frame period duration, significantly reducing disclination effects while maintaining manageable control complexity through systematic bit arrangement.
Data Source
AI summary
The liquid crystal drive apparatus drives a liquid crystal element. The apparatus includes an image data producer producing, using each of multiple input frame image data continuously input thereto, first frame image data and second frame image data, and a driver sequentially controlling, depending on the first frame image data and the second frame image data, application of a first voltage or a second voltage lower than the first voltage to each of multiple pixels of the liquid crystal element in respective multiple sub-frame periods included in one frame period to cause that pixel to form a tone. Pixel data at pixel positions corresponding to each other in the first and second frame image data have mutually different tones. A tone difference between the mutually different tones is 20% or less of a higher one of the mutually different tones.