Liquid Crystal Display Spacer Placement on Color Filter
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Solution Overview
Problem
In liquid crystal displays, spherical or columnar spacers disrupt the alignment of liquid crystal molecules, leading to light leakage and reduced contrast due to their presence between the color filter and TFT substrates.
Innovation Solution
The use of spacers positioned on specific portions of the color filters, ensuring uniform height and minimizing disturbance to liquid crystal alignment, with spacers arranged on flat portions and away from the opening areas to maintain even thickness of the liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spacers are provided inside the liquid crystal layer to maintain cell gap thickness, then the liquid crystal layer thickness is maintained uniformly, but the alignment of liquid crystal molecules is disturbed in the neighborhood of the spacers causing light leakage and degraded contrast
Solution Approach 1:
The invention extracts spacers from the liquid crystal layer and relocates them to the color filter substrate. Specifically, spacers are provided on the color filter substrate in a non-display area, thereby maintaining cell gap thickness without allowing spacers to contact the liquid crystal molecules in the display area, thus eliminating light leakage and contrast degradation while preserving thickness uniformity
Solution Approach 2:
The invention changes the spatial dimension of spacer placement from within the liquid crystal layer (three-dimensional positioning among liquid crystal molecules) to the color filter substrate plane (two-dimensional positioning in non-display area). This dimensional relocation allows spacers to maintain cell gap thickness through their height while being positioned away from the liquid crystal display area, thus resolving the contradiction between thickness control and optical quality
2Manufacturing precision
If spacers are placed in the display area to control liquid crystal layer thickness, then thickness control is improved, but display performance deteriorates due to alignment disturbance and light leakage
Solution Approach 1:
The invention extracts spacers from the display area and relocates them to the non-display area on the color filter substrate. This extraction maintains the thickness control function through spacer height while eliminating the harmful impact on liquid crystal alignment and light leakage in the display area, thus improving display performance without sacrificing thickness precision
Solution Approach 2:
The invention introduces the color filter substrate as an intermediary carrier for spacers. Instead of placing spacers directly in the liquid crystal layer, they are positioned on the color filter substrate in the non-display area. This intermediary arrangement allows the spacer height to control cell gap thickness while the spacer bodies remain isolated from the liquid crystal display area, preserving both thickness control and display quality
Data Source
AI summary
A liquid crystal display includes: a first substrate and a second substrate arranged to face each other; a liquid crystal layer provided between the first substrate and the second substrate; first and second color filters of different colors, which are provided on the first substrate and arrayed in a first direction; and a first spacer provided between the first substrate and the second substrate and configured to adjust thickness of the liquid crystal layer. Each of the first and second color filters includes a first portion extending in a second direction intersecting with the first direction, and a second portion connected to the first portion and projected in the first direction. The first spacer is provided on the second portion.