LCD Pixel Boundary Correction for Domain Defects and Black Floating
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Solution Overview
Problem
The horizontal electric field between adjacent pixel electrodes in liquid crystal panels causes poor alignment of liquid crystal, leading to display defects such as domains, and existing domain correction techniques result in issues like black floating.
Innovation Solution
A display control circuit performs first and second corrections on pixel data based on gradation levels to adjust the voltage differences between adjacent bright and dark panel pixels, reducing the horizontal electric field while minimizing black floating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If domain correction is performed to reduce horizontal electric field, then liquid crystal alignment improves, but black floating occurs
Solution Approach 1:
The patent applies different correction amounts to different pixel types at boundaries. Bright pixels receive a first correction amount while dark pixels receive a second correction amount, where the correction amounts are determined based on the specific pixel characteristics and boundary conditions. This localized differentiation prevents black floating while maintaining alignment improvement.
Solution Approach 2:
The patent dynamically adjusts correction parameters based on pixel gradation levels and boundary detection. The correction amounts are not fixed but are determined by detecting boundaries between bright and dark pixels and adjusting the correction magnitude accordingly, transforming the correction process from a static parameter to a dynamic adaptive system.
2Reliability
If correction amount is increased to reduce horizontal electric field, then domain defects decrease, but black floating becomes more severe
Solution Approach 1:
The patent applies partial correction rather than excessive correction. By determining appropriate correction amounts that are sufficient to reduce horizontal electric field effects but not so large as to cause black floating, the system achieves optimal balance. The correction is precisely calibrated to address only the necessary degree of domain defects.
Data Source
AI summary
First correction is performed on each piece of pixel data based on a gradation level of a panel pixel around each piece of pixel data, a boundary at which a bright panel pixel, and a dark panel pixel, are adjacent to each other is detected, when there is a first boundary at which the gradation level of the bright panel pixel being a bright panel pixel related to the detected boundary and subjected to the first correction is equal to or higher than a third threshold value, in a first bright panel pixel and a first dark panel pixel adjacent to each other via the first boundary, second correction for bringing the gradation level of the first bright panel pixel close to a first threshold value and bringing the gradation level of the first dark panel pixel close to the second threshold value is performed.