Color Filter Substrate Electrode Slit Patterns for LCD Uniformity
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in achieving precise control over gray scale levels and display quality due to differences in dielectric constants of color filters, which affect electric field distributions and lead to variations in pixel performance.
Innovation Solution
Incorporating electrodes with specific patterns and slit configurations on a color filter substrate, where the widths and lengths of slits differ between color filters with varying dielectric constants, and using finger-like structures to connect electrode portions, compensates for these differences, ensuring uniform electric field distributions across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If color filters with different dielectric constants are used for different color pixels, then color display capability is improved, but electric field distribution becomes non-uniform causing gray scale control errors
Solution Approach 1:
The patent applies local quality by creating different slit patterns in different regions of the common electrode corresponding to different color sub-pixels. Specifically, green sub-pixels have different slit configurations compared to red and blue sub-pixels, allowing each region to compensate for its specific dielectric constant characteristics and achieve uniform electric field distribution across all color channels
Solution Approach 2:
The patent changes physical parameters of the electrode structure by varying slit width, slit length, and slit spacing in different regions. These parameter adjustments compensate for the different dielectric constants of color filter materials, ensuring that electric field strength and liquid crystal molecule orientation remain consistent across pixels with different colors
2Device complexity
If uniform electrode patterns are used across all pixels, then manufacturing simplicity is maintained, but display quality deteriorates due to non-uniform electric fields in different color pixels
Solution Approach 1:
The patent implements local quality by designing region-specific electrode patterns where green sub-pixels have distinct slit configurations compared to red and blue sub-pixels. This localized differentiation ensures that each color channel's unique dielectric properties are compensated, achieving consistent display quality across all pixels while maintaining overall pattern regularity
Solution Approach 2:
The patent applies segmentation by dividing the common electrode into distinct regions corresponding to different color sub-pixels (red, green, blue). Each region is assigned a specific slit pattern optimized for its color channel's dielectric characteristics, allowing independent optimization of electric field distribution for each color while maintaining overall electrode functionality
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 allows for more precise control over gray scale levels and enhances display quality by aligning liquid crystal molecules uniformly, improving image quality and reducing image retention issues.
Implementation Method 1
differences in dielectric constants of color filter layers... the at least one first slit including a first slit having a width that is larger than the width of any of the second slits
Data Source
AI summary
A display has color pixels that can be controlled to show color images. Differences in electric fields in different color pixels having color filters with different dielectric constants can be compensated by providing electrodes with different patterns for the different color pixels. For example, the electrodes can have slits in which the widths of the slits can be different for pixels having different colors.