LCD Pixel Voltage Correction for Disclination-Free Midtones
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Solution Overview
Problem
The narrowing gap between pixel electrodes in liquid crystal panels due to reduced size and high definition leads to significant lateral electric fields, causing alignment failure of liquid crystal molecules known as disclination, which results in display defects.
Innovation Solution
A liquid crystal display apparatus with a display control circuit that adjusts data signals based on gradation levels of adjacent video pixels, applying intermediate voltages within specific thresholds to mitigate disclination and prevent display contradictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the gap between pixel electrodes is narrowed to achieve reduced size and high definition, then the display resolution and compactness are improved, but lateral electric fields increase causing disclination and display defects
Solution Approach 1:
The display control circuit performs preliminary correction on video data before display, detecting potential disclination regions and adjusting gradation levels in advance to prevent the alignment failure of liquid crystal molecules caused by lateral electric fields
Solution Approach 2:
The invention changes the voltage parameters of data signals supplied to pixel electrodes by adjusting gradation levels of video pixels. When a video pixel and its adjacent pixel both fall within the intermediate gradation range, the voltage is modified to prevent excessive voltage differences that would cause disclination
2Reliability
If disclination correction is applied to video data to reduce voltage differences between adjacent pixel electrodes, then display defects are reduced, but display contradiction occurs and original display quality deteriorates
Solution Approach 1:
The invention applies different processing strategies to different regions of video data based on local characteristics. Only video pixels within the intermediate gradation range undergo voltage adjustment, while pixels outside this range maintain their original values, thereby applying correction locally where needed without affecting overall display quality
Solution Approach 2:
The invention performs partial correction by only adjusting the voltage of video pixels that fall within the intermediate gradation range, rather than applying uniform correction to all pixels. This selective approach prevents excessive action that would degrade display quality while still addressing the disclination problem in critical regions
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 reduces disclination-induced display defects and blurring by optimizing voltage differences between adjacent pixels, maintaining display quality and clarity.
Implementation Method 1
an alignment failure of liquid crystal molecules called disclination occurs due to the lateral electric field
Implementation Method 2
an influence of an electric field generated between the pixel electrodes adjacent to each other, that is, an electric field (lateral electric field) in a direction parallel to a substrate surface becomes nonnegligible
Data Source
AI summary
A display control circuit performs first correction on pixel data of video pixels based on the pixel data of two or more surrounding video pixels, determines whether both a voltage according to a gradation level of a video pixel of interest out of the pixel data on which the first correction was performed and a voltage according to a gradation level of a video pixel adjacent to the video pixel of interest are within an intermediate gradation range, performs second correction of cancelling out the first correction performed on the pixel data of the video pixel of interest when both the voltages are within the intermediate gradation range, and supplies the panel pixel with a data signal based on the pixel data on which the first correction was performed or, a data signal based on the pixel data on which the second correction was performed.