Display Panel Sealant Corner Width Design
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Solution Overview
Problem
Conventional liquid crystal display panels face issues with sealant peeling and contamination of the liquid crystal layer due to low tensile strength and inaccurate width control, particularly in panels with narrow bezels, leading to reduced product quality and yield.
Innovation Solution
The display panel design incorporates a sealant with corner portions and strip-shaped portions that intersect, forming extending blocks and retracting regions, ensuring a larger maximum width at corners away from the display region, which increases the sealant's tensile strength and prevents it from spanning into the display area, while the manufacturing method involves precise coating and pressing techniques to achieve accurate width control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sealant forms an arc at corner portions with arc circumference larger than width, then the sealant can be applied continuously, but the adhesive force at corner portions becomes low causing peeling
Solution Approach 1:
The sealant structure is designed with different local characteristics: corner portions have larger width than strip-shaped portions. This local quality variation increases the contact area at corner portions with the substrates, thereby enhancing adhesive force specifically where peeling occurs, while maintaining continuous application capability in strip regions.
2Ease of manufacture
If the arc circumference of corner portions is larger than the width of the sealant, then the sealant can be applied smoothly, but inner edges of corner portions span the display region to pollute the liquid crystal layer
Solution Approach 1:
The sealant design implements local quality differentiation where corner portions have larger width and strip-shaped portions have smaller width. This ensures that while corner portions provide sufficient adhesive strength, the strip-shaped portions maintain appropriate dimensions that prevent spanning into the display region, thus avoiding liquid crystal contamination.
Solution Approach 2:
The sealant is segmented into distinct corner portions and strip-shaped portions with different width characteristics. This segmentation allows independent optimization of each segment: corner portions for adhesive strength and strip-shaped portions for preventing contamination, thereby resolving the contradiction between application smoothness and contamination prevention.
3Object-affected harmful factors
If the sealant width is reduced to prevent spanning into display region, then contamination is prevented, but tensile strength of the sealant is insufficient
Solution Approach 1:
The sealant structure employs local quality variation with corner portions having larger width for tensile strength and strip-shaped portions having smaller width for preventing contamination. This local differentiation allows the sealant to simultaneously achieve sufficient tensile strength at critical corner regions while maintaining appropriate width in strip regions to prevent spanning into the display region.
Solution Approach 2:
By segmenting the sealant into corner portions and strip-shaped portions with different width characteristics, the design enables the corner portions to provide the necessary tensile strength while the strip-shaped portions maintain controlled width to prevent contamination of the liquid crystal layer.
Data Source
AI summary
A display panel includes a first substrate, a second substrate and a sealant. The first substrate has a display region and a sealant coating region, the sealant coating region surrounds the display region. The second substrate is disposed above the first substrate. The sealant is disposed between the first substrate and the second substrate and is located in the sealant coating region. The sealant includes at least one corner portion and a plurality of strip-shaped portions. The adjacent strip-shaped portions intersect at the corner portion, and a maximum width of the corner portion is larger than widths of the strip-shaped portions. A manufacturing method of the display panel is also provided.