Reflection Plate Asymmetry for Light Interference Suppression
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Solution Overview
Problem
Transflective liquid crystal display devices experience interference and rainbow-like coloring due to the periodicity of uneven patterns in reflection plates, which becomes problematic in high-definition displays where the size of these patterns cannot be reduced further by photolithography, leading to insufficient light interference suppression.
Innovation Solution
A reflection plate with recessed or protruded parts in polygon shapes, where an arbitrary point other than the centroid is positioned at an orderly-mannered lattice point as an origin, and each polygon is rotated randomly to prevent overlapping, forming a pattern that suppresses light interference effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an uneven pattern is formed in the reflection plate to improve light scattering, then light dispersibility is improved, but periodicity of the pattern causes interference and rainbow-like coloring under strong light
Solution Approach 1:
The patent applies asymmetry by making the uneven patterns non-periodic and irregular in shape, eliminating the symmetric repeating structures that cause interference. The patterns are designed with varying sizes, shapes, and spacings to disrupt the periodicity that generates rainbow-like coloring while maintaining light scattering functionality.
Solution Approach 2:
The patent implements local quality by creating uneven patterns with different characteristics in different regions of the reflection plate. Each local area has uniquely designed patterns with varying degrees of irregularity, ensuring that no two regions have identical periodic structures, thereby preventing interference while optimizing light scattering locally.
2Manufacturing precision
If the unit pixel size is reduced to increase definition, then display resolution is improved, but the area available for uneven patterns decreases, making interference suppression more difficult
Solution Approach 1:
The patent applies segmentation by dividing the reflection plate into multiple independent uneven patterns within each unit pixel area. Instead of using a single large pattern, multiple smaller irregular patterns are distributed throughout the pixel, which reduces the periodicity effect while maintaining effective light scattering in the reduced pixel area.
Solution Approach 2:
The patent addresses the dimensional constraint by transitioning from considering only the two-dimensional pixel area to utilizing the third dimension of pattern depth and vertical structure. The uneven patterns extend in the vertical direction with varying heights and depths, providing additional degrees of freedom for light scattering without increasing the horizontal footprint, thus solving the space limitation in high-definition displays.
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 light interference and enhances light dispersibility, providing improved display characteristics with suppressed coloring and no roughness on the liquid crystal display device, while maintaining high reflectance and efficient data handling.
Implementation Method 1
a reflection plate which includes recessed or protruded parts and a reflection film formed over the recessed or protruded parts
Implementation Method 2
the surface of the liquid crystal display device looks shining in rainbow hues due to the interference effect of the light when strong light such as the direct sunlight is irradiated thereto
Data Source
AI summary
It is to suppress the interference of the reflected light easily and securely even in a highly fine liquid crystal display device. The reflection plate comprises recessed or protruded parts and a reflection film formed over the recessed or protruded parts. A unit shape of the recessed or protruded parts is a polygon, an arbitrary point other than a centroid of the polygon that constitutes the recessed or protrude part is placed at a position that meets with an orderly-mannered lattice point as an origin, and each of the unit-shape polygons is arranged at a position that is rotated randomly with respect to the origin.