In-Plane Switching LCD Homogeneous Shading via Asymmetric Subpixel Layout
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Solution Overview
Problem
Traditional in-plane switching (IPS) LCD devices exhibit nonhomogeneous shading due to uneven light blockage and leakage caused by the arrangement of common and signal lines, leading to brighter areas and less-than-optimal display homogeneity.
Innovation Solution
The improved LCD device design includes a configuration where subpixels are arranged such that signal lines are positioned either closer to or further from the liquid crystal layer than common lines, and the arrangement of subpixels and lines is optimized to prevent light reflection back towards the display surface, ensuring that each subpixel receives uniform light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If common lines and signal lines are arranged in a traditional configuration, then the device structure is simple, but nonhomogeneous shading occurs due to uneven light blockage and leakage
Solution Approach 1:
The patent applies local quality by making the second subpixel (red subpixel) distinct from adjacent subpixels by positioning it non-adjacent to common lines, while other subpixels follow traditional arrangements. This localized differentiation eliminates uneven light blockage in the red subpixel region, achieving homogeneous shading across the display without requiring complete redesign of the entire line arrangement structure.
2Manufacturing precision
If signal lines are positioned adjacent to all subpixels, then electrical connection is simplified, but light reflection and leakage increase causing brighter areas
Solution Approach 1:
The patent extracts the harmful light reflection issue by removing the signal line from the immediate vicinity of the second subpixel (red subpixel). By positioning the second subpixel non-adjacent to common lines and strategically arranging signal lines, the design eliminates the source of light reflection and leakage that causes localized brightness, while maintaining electrical connectivity through alternative routing paths.
3Manufacturing precision
If the second subpixel is positioned adjacent to common lines, then pixel structure is compact, but light blockage becomes uneven causing nonhomogeneous shading
Solution Approach 1:
The patent applies asymmetry by creating an asymmetric arrangement where the second subpixel (red subpixel) is positioned differently from other subpixels - specifically non-adjacent to common lines. This asymmetric positioning compensates for the symmetric arrangement of other elements, eliminating uneven light blockage and achieving homogeneous shading while maintaining overall pixel compactness through optimized spatial relationships.
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 configuration results in homogeneous shading across the display, reducing the occurrence of brighter areas and enhancing the overall display quality by minimizing light blockage and leakage.
Implementation Method 1
a liquid crystal layer interposed between the first substrate and the second substrate
Implementation Method 2
at least one of the two adjacent common lines or the four signal lines made of or including copper
Data Source
AI summary
A liquid crystal display device includes an arrangement of pixels, wherein each of the pixels includes at least three subpixels, wherein the second subpixel is a Red subpixel, in contrast to the traditional Red-Green-Blue subpixel configuration. Further, a signal line is disposed next to each of the subpixels, but a common line is disposed next to a subpixel which is not a Red subpixel. Thus, the second subpixel, which is a Red subpixel, has on both sides thereof signal lines, but lacks a common line next thereto.