Liquid Crystal Display Spacer Configuration for Panel Flatness
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Solution Overview
Problem
Liquid crystal display devices face the issue of the outer periphery bending more than the image display region unless spacers in both areas are of the same height, leading to potential seal member leakage and display panel distortion.
Innovation Solution
The implementation of first and second protrusions on the array and counter substrates, respectively, with the first protrusion in the image display region and the second in the peripheral region, both of the same height but with different distances from the substrate, forming a cross-shaped spacer to maintain the liquid crystal layer thickness and prevent seal member intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spacers of the same height are provided in both the image display region and the outer periphery, then the liquid crystal layer thickness is maintained uniformly, but the outer periphery of the display panel bends due to the spacer in the outer periphery
Solution Approach 1:
The invention applies different spacer configurations to different regions: in the image display region, spacers of a first height are provided to maintain liquid crystal layer thickness, while in the outer periphery, spacers of a second height (different from the first height) are provided. This local differentiation prevents the outer periphery bending issue while maintaining the required liquid crystal layer thickness uniformity in the display region.
2Reliability
If spacers are provided in the outer periphery to prevent seal member leakage, then seal member positioning is improved, but the display panel outer periphery bends
Solution Approach 1:
The invention provides spacers with a second height specifically in the outer periphery region, different from the spacer height in the image display region. This localized spacer configuration maintains seal member positioning stability in the outer periphery while preventing the bending issue that occurs when uniform height spacers are used throughout the entire panel.
3Shape
If spacers of different heights are used in the image display region and outer periphery, then outer periphery bending is prevented, but the liquid crystal layer thickness uniformity may be compromised
Solution Approach 1:
The invention carefully positions spacers of the first height (different from the second height) specifically within the image display region, ensuring that the liquid crystal layer thickness is maintained uniformly where it matters for display quality. The spacers of the second height are positioned in the outer periphery to prevent bending, while the transition between different spacer heights is managed to avoid affecting the liquid crystal layer thickness uniformity in the display region.
Data Source
AI summary
A liquid crystal display device includes a counter substrate having a glass substrate, a color layer on the glass substrate, an overcoating layer on the color layer, and a counter protrusion and a counter wall protrusion on the overcoating layer. The counter protrusion is located in an image display region. The counter wall protrusion is located in a peripheral region enclosing the image display region. The counter protrusion and the counter wall protrusion are of substantially a same height. A first protrusion distance from the glass substrate to a top of the counter protrusion is shorter than a second protrusion distance from the glass substrate to a top of the counter wall protrusion. According to the liquid crystal display device configured as above, an outer periphery of a display panel does not bend.