Liquid Crystal Panel Domain Correction via Gray Scale Adjustment
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Solution Overview
Problem
In three-panel liquid crystal projectors, the variation in voltage ranges for each color's liquid crystal panel can disrupt the relationship between voltages, making it challenging to perform domain correction effectively, especially when the color mode differs for each color, leading to potential display defects.
Innovation Solution
A control method for a display device that includes a first, second, and third liquid crystal panel, where pixel data is supplied with reduced gray scale levels for non-reference panel pixels, and correction data from a look-up table is used to adjust gray scale levels based on the difference between adjacent pixels, ensuring the transmittance of reference and other panel pixels are equivalent, thereby reducing horizontal electric fields and suppressing domain formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the interval between pixel electrodes is reduced for size reduction and high definition enhancement, then the definition and size are improved, but horizontal electric fields between adjacent pixel electrodes increase causing domain formation and display defects
Solution Approach 1:
The patent changes the voltage parameters applied to pixel electrodes by introducing domain correction values. When the absolute difference between voltages of adjacent pixel electrodes exceeds a threshold, correction values are added to reduce this difference, thereby suppressing horizontal electric fields and domain formation while maintaining high definition display
2Reliability
If domain correction is performed by adjusting gray scale levels of adjacent pixels, then domain formation is suppressed, but the relationship between voltages for different colors is disrupted when voltage ranges differ for each color
Solution Approach 1:
The patent applies different domain correction strategies based on local conditions: when voltage ranges for different colors are the same, standard domain correction is applied; when voltage ranges differ, domain correction is performed only for the color with the higher voltage range. This localized approach maintains color voltage relationships while suppressing domains
3Reliability
If correction is performed for each color when voltage difference between adjacent pixel electrodes exceeds threshold, then domain correction is achieved, but the complexity of voltage coordination across multiple colors increases
Solution Approach 1:
The patent simplifies the complex multi-color voltage coordination by dynamically changing the correction parameters based on voltage range comparisons. The system adjusts which colors receive domain correction and by how much, reducing the coordination complexity while maintaining correction effectiveness
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
This approach effectively suppresses display defects by maintaining equivalent transmittance across panel pixels, reducing the risk of domain formation and associated color deviations, thereby enhancing image quality.
Implementation Method 1
When a voltage corresponding to a gray scale level is maintained between the pixel electrodes and the common electrodes, an alignment state of liquid crystal molecules is defined. With this, a transmittance or a reflectance corresponding to the voltage is obtained.
Implementation Method 2
an influence of an electric field generated between the pixel electrodes adjacent to each other, in other words, an electric field in a direction parallel to the base plate surface is not negligible
Data Source
AI summary
A display device includes liquid crystal panels, and displays an image, based on emission light from each of the liquid crystal panels. A display control circuit of the display device supplies image data of respective colors R, G, and B to the corresponding liquid crystal panels. A panel pixel having the lowest transmittance of three panel pixels corresponding to white-side pixels at domain boundaries is regarded as a reference panel pixel. The display control circuit reduces a gray scale level of pixel data supplied to two panel pixels other than the reference panel pixel of the three panel pixels. With this, coloring of the white-side pixels can be suppressed.