Video Processing Circuit for Liquid Crystal Misorientation Correction
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Solution Overview
Problem
High-resolution liquid crystal panels with closely spaced pixels experience misorientation due to horizontal electric fields, leading to decreased display quality, as existing correction methods are ineffective in managing voltage-brightness characteristics and result in significant gradation changes.
Innovation Solution
A video processing circuit that detects adjacent pixels with voltage differences exceeding a threshold, replaces application voltages based on voltage-brightness characteristics, and adjusts these voltages to reduce misorientation by using a correcting unit with region-specific correction coefficients to minimize visual disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the liquid crystal panel has high resolution and reduced distance between adjacent pixels, then the display resolution is improved, but horizontal electric fields are generated between pixel electrodes causing misorientation and decreased display quality
Solution Approach 1:
The patent applies preliminary anti-action by detecting voltage differences between adjacent pixels before misorientation occurs and preemptively correcting the voltage application. The video processing circuit identifies pixels with voltage differences exceeding a threshold and adjusts their voltages to prevent the generation of harmful horizontal electric fields, thereby preventing misorientation before it degrades display quality.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the voltage parameters applied to pixel electrodes based on detected voltage differences. The system modifies the voltage magnitude and distribution across pixels, changing the electrical parameters to eliminate conditions that generate horizontal electric fields, thus preventing misorientation while maintaining high resolution display capabilities.
2Object-affected harmful factors
If voltage correction is applied to prevent misorientation, then display quality is improved, but significant gradation changes occur due to voltage-brightness characteristics
Solution Approach 1:
The patent applies local quality by implementing region-specific correction coefficients that are tailored to different voltage-brightness characteristic regions. Instead of uniform correction, the system divides the voltage-brightness characteristics into multiple regions and applies appropriate correction coefficients to each region, ensuring that voltage corrections prevent misorientation while minimizing unwanted gradation changes in different brightness ranges.
Solution Approach 2:
The patent implements feedback by continuously monitoring the voltage differences between adjacent pixels and adjusting voltage application based on detected conditions. The system uses feedback from voltage difference detection to trigger selective correction only when necessary (when differences exceed a threshold), and uses feedback from voltage-brightness characteristic information to determine appropriate correction amounts, thereby preventing misorientation while maintaining gradation consistency.
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 the visual impact of misorientation by optimizing voltage application across pixels, maintaining gradation consistency and improving display quality even in high-resolution panels.
Implementation Method 1
voltage-brightness characteristics (for example, V-T characteristics) of a liquid crystal element
Implementation Method 2
controls an orientation state of liquid crystal molecules by using an electric field between a pixel electrode and a counter electrode
Implementation Method 3
an electric field (horizontal electric field) is generated between pixel electrodes of two pixels, and misorientation (so-called disclination or reverse tilt domain) occurs in which liquid crystal molecules are oriented in an unintended direction
Data Source
AI summary
A video processing circuit includes a detecting unit that detects a set of a first pixel and a second pixel adjacent to the first pixel, which is a set of pixels in which a difference between application voltages to the first pixel and the second pixel which are indicated by an input video signal is greater than or equal to a threshold; an acquisition unit that acquires information which specifies a plurality of regions of voltage-brightness characteristics which are voltage-brightness characteristics of the pixel group and in which a voltage region is separated into the plurality of regions in accordance with a slope of the voltage-brightness characteristics; and a replacing unit that replaces the application voltage to the first pixel with a voltage which is in a region other than a first region and is close to a second region.