Display Device Light-Shielding Layer Cell Gap Uniformity
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Solution Overview
Problem
Non-uniform cell gap between substrates in liquid crystal display devices leads to display non-uniformity, which existing technologies fail to adequately suppress, resulting in potential damage to signal supply sources and display quality deterioration.
Innovation Solution
A configuration where the second substrate with a light-shielding layer and switching elements is arranged on the display surface side, with a constant adhesive thickness between the optical elements and cover glass, ensuring uniform cell gap and preventing external light reflection and irradiation, thus maintaining display quality and reducing the risk to signal supply sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid crystal display device comprises an array substrate and a counter-substrate with a color filter layer and switching element layer, then the display device can achieve basic display function, but non-uniform cell gap between substrates causes display non-uniformity
Solution Approach 1:
The patent applies local quality by positioning the light-shielding layer specifically at the peripheral region of the counter-substrate, where it contacts the cover glass. This localized light-shielding structure prevents external light from entering the liquid crystal layer at critical edges, thereby suppressing display non-uniformity caused by non-uniform cell gap without requiring uniform modification across the entire substrate.
Solution Approach 2:
The patent introduces a light-shielding layer as an intermediary element between the external environment and the liquid crystal display device. This intermediate layer blocks external light from reaching the liquid crystal layer, particularly at the peripheral regions where cell gap non-uniformity is most problematic, thereby preventing display non-uniformity without altering the fundamental substrate structure.
2Ease of manufacture
If adhesive is used to bond optical elements and cover glass, then assembly is achieved, but non-uniform adhesive thickness causes non-uniform cell gap and display deterioration
Solution Approach 1:
The patent converts the potentially harmful effect of non-uniform adhesive thickness into a beneficial outcome by strategically placing the light-shielding layer at the periphery. This light-shielding structure compensates for cell gap non-uniformity caused by adhesive variations, transforming the manufacturing challenge into an opportunity to enhance display uniformity through targeted light blocking.
Solution Approach 2:
The patent applies local quality by concentrating the light-shielding function at the peripheral region where adhesive non-uniformity has the greatest impact on display quality. Rather than requiring uniform adhesive thickness across the entire assembly, the light-shielding layer is positioned specifically where it can most effectively compensate for adhesive variations and prevent display non-uniformity.
3Ease of operation
If signal supply sources are positioned on the display device, then electrical connection is achieved, but external light reflection and irradiation can damage the signal supply sources
Solution Approach 1:
The patent introduces a light-shielding layer as an intermediary protective element between external light sources and the signal supply sources. This intermediate light-shielding structure blocks harmful external light from reaching the signal supply sources, thereby protecting them from damage while maintaining their electrical connection functions.
Solution Approach 2:
The patent converts the potentially harmful effect of external light exposure into a protective measure by implementing the light-shielding layer. This light-shielding structure, positioned at the periphery, not only blocks harmful light from reaching signal supply sources but also helps maintain display uniformity, transforming a protective function into a dual-benefit solution.
Data Source
AI summary
According to one embodiment, a display device includes a first substrate including a first insulating substrate, and a second substrate including a second insulating substrate arranged on a display surface side on which an image is displayed to the first substrate, a light-shielding layer arranged on a side of the second insulating substrate, which is opposed to the first substrate, a gate line and a source line arranged on a side of the light-shielding layer, which is opposed to the first substrate, to extend along the light-shielding layer, a switching element electrically connected to the gate line and the source line, and a pixel electrode electrically connected to the switching element.