Varying-Width Light Blocking Members for LCD Contrast
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Solution Overview
Problem
Misalignment between the light blocking member and the opening region of the pixel area in liquid crystal displays leads to reduced contrast ratio and display quality deterioration, such as stains, especially when the substrates are not perfectly aligned.
Innovation Solution
A liquid crystal display design where the width of the light blocking members varies along the edge of the pixel areas, increasing and then decreasing from the center to the edge, with different widths for different pixel positions, and the inclusion of a sealant at the edges to prevent misalignment and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light blocking members with uniform width are used, then manufacturing is simple, but misalignment between substrates causes contrast ratio reduction and display quality deterioration
Solution Approach 1:
The light blocking members are designed with varying widths at different positions: wider at edge regions and narrower at center regions. This local variation in geometry allows the structure to compensate for substrate misalignment at edges while maintaining proper function at the center, thereby improving contrast ratio without requiring complex active control mechanisms
Solution Approach 2:
The light blocking members are pre-positioned on the second substrate with specific width variations before assembly. This preliminary configuration ensures that even when substrates are assembled with misalignment, the light blocking members already have the appropriate geometry to prevent light leakage and maintain contrast ratio, eliminating the need for post-assembly adjustment
2Reliability
If light blocking members are positioned to overlap signal lines, then light leakage is prevented, but substrate misalignment causes misalignment between light blocking members and pixel opening regions
Solution Approach 1:
The light blocking members feature asymmetric width distribution relative to the pixel structure, with greater width at edge positions compared to center positions. This asymmetric design provides a tolerance buffer that accommodates substrate misalignment, ensuring continuous overlap with signal lines and pixel opening regions even when manufacturing precision varies
Solution Approach 2:
The varied width design of light blocking members creates a geometric cushion or tolerance zone that absorbs the impact of substrate misalignment. The wider edge portions provide a margin of error that prevents complete misalignment between light blocking members and pixel regions, cushioning against manufacturing variations before they can cause light leakage
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 design effectively prevents misalignment and light leakage, enhancing the contrast ratio and maintaining display quality by ensuring the light blocking members overlap the signal lines even under varying compressive forces, thus reducing the occurrence of stains at the pixel edges.
Implementation Method 1
the orientations of LC molecules change in response to the electric field to adjust polarization of incident light
Implementation Method 2
applying voltages to the field-generating electrodes to generate an electric field in the LC layer
Implementation Method 3
a light blocking member is formed on an edge of each pixel area to prevent light leakage on the edge of the pixel area
Data Source
AI summary
A liquid crystal display that improve display quality by reducing light leakage is presented. The display includes a first substrate; a plurality of pixels disposed on the first substrate; a plurality of signal lines disposed on the first substrate and disposed at an edge of the plurality of pixels; a second substrate facing the first substrate; and a light blocking member disposed on the second substrate, overlapping the plurality of signal lines, and overlapping the edge of the plurality of pixel areas, wherein a width of the light blocking member overlapping the edge of the plurality of pixels varies depending on the position of the plurality of pixels.