LCD Panel Spacer Density for Uniform Cell Gap
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Solution Overview
Problem
In liquid crystal display panels, cell gap differences between the active area and the outside area lead to substrate twisting and staining due to uneven pressure distribution after vacuum joining, as the outside area lacks a color filter and has a different spacer arrangement.
Innovation Solution
The implementation of a liquid crystal display panel with a higher arrangement density of second pattern spacers around the adhesive in the outside area, matching the first pattern spacers in the active area, along with a black matrix and smoothing layer to ensure uniform cell gaps and prevent substrate twisting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outside area is left without a color filter and with different spacer arrangement, then the manufacturing process is simpler, but substrate twisting and staining occur due to uneven pressure distribution
Solution Approach 1:
The patent applies local quality by creating different spacer arrangement densities in different regions. The outside area has a higher arrangement density of second pattern spacers compared to the first pattern spacers in the active area, which locally compensates for the absence of color filter structures and maintains uniform cell gap across the entire panel.
Solution Approach 2:
The patent changes the arrangement density parameter of the spacers in the outside area. By increasing the density of second pattern spacers in the outside area compared to the active area, the patent compensates for the pressure distribution imbalance caused by the missing color filter structures, thereby maintaining uniform cell gap.
2Device complexity
If the outside area lacks color filter and has different spacer arrangement, then the structure is simpler, but substrate twisting occurs due to uneven pressure distribution
Solution Approach 1:
The patent implements local quality by introducing second pattern spacers with higher arrangement density specifically in the outside area. This localized structural modification compensates for the simplified structure (absence of color filter) in the outside area, maintaining overall substrate stability and preventing twisting.
Solution Approach 2:
The patent applies preliminary anti-action by pre-positioning the second pattern spacers with higher arrangement density in the outside area before the vacuum joining process. This preliminary structural arrangement counteracts the future pressure imbalance that would cause substrate twisting, preventing the problem before it occurs.
3Adaptability or versatility
If the outside area has different spacer arrangement density, then the structure is adapted to the absence of color filter, but cell gap difference causes staining
Solution Approach 1:
The patent applies local quality by creating region-specific spacer arrangements. The outside area has second pattern spacers with higher arrangement density adapted to the absence of color filter, while the active area maintains the standard first pattern spacer arrangement. This localized adaptation ensures uniform cell gap across the entire panel, preventing staining.
Data Source
AI summary
A liquid crystal display panel and a fabricating method thereof for preventing a generation of stains caused by a cell gap difference between an active area and an outside area are disclosed. In the liquid crystal display panel, an adhesive is placed between an upper substrate and a lower substrate that are closed in such a manner as to join an upper substrate from a lower substrate. A liquid crystal layer is provided at a closed area defined by the adhesive by a dropping system. A first pattern spacer is positioned at an active area between the upper substrate and the lower substrate. A second pattern spacer is provided such that an outside area thereof enclosing said active area has a different arrangement density from the first pattern spacer and is provided at the same plane as the first pattern spacer.