Light-Shielding Pattern for LCD Panel Scribing Yield
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Solution Overview
Problem
The ultra slim border design in liquid crystal display (LCD) panels complicates the sealant dispensing process, leading to accuracy issues and unsatisfactory scribing during the scribing and splitting process, which affects production yield.
Innovation Solution
A light-shielding pattern is disposed on the substrate, aligning with the sidewall of the substrate, to prevent full curing of the photo-curable sealant on scribe lines, ensuring successful separation of LCD panels and maintaining production yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If ultra slim border design is implemented, then the area occupied by peripheral circuits is reduced, but the sealant dispensing accuracy deteriorates and scribing quality worsens
Solution Approach 1:
A light-shielding pattern is introduced as an intermediary element between the sealant and the curing light source. This pattern selectively blocks light in specific regions (scribe lines and border areas) while allowing light to pass through other regions, enabling differential curing of the sealant. The light-shielding pattern acts as a mediator that controls the curing process spatially, preventing premature curing of sealant in areas that need to remain flexible for scribing while ensuring curing in areas that require structural integrity.
2Area of stationary object
If ultra slim border design is implemented, then the area occupied by peripheral circuits is reduced, but the scribing quality deteriorates with concave-convex angles formed
Solution Approach 1:
The light-shielding pattern is applied in advance to the substrate before sealant dispensing and curing. This preliminary placement of the light-shielding pattern pre-determines which areas of the sealant will be cured and which will remain uncured. By establishing this spatial differentiation before the scribing process, the uncured sealant in border regions remains flexible and can accommodate the scribing process without forming concave-convex angles, while cured sealant in display regions provides necessary structural support.
3Area of stationary object
If sealant is dispensed in ultra slim border area, then the border design is achieved, but the sealant shifts onto scribe lines causing process accuracy to deteriorate
Solution Approach 1:
The light-shielding pattern serves as a spatial mediator that controls sealant curing behavior. By positioning the light-shielding pattern such that its light-shielding regions align with scribe lines and border areas, it creates a controlled environment where sealant in these regions remains uncured during initial curing steps. This allows the sealant to be dispensed with greater positional freedom without risking premature curing that would cause shifting or overflow onto scribe lines.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The light-shielding pattern effectively prevents full curing of the sealant on scribe lines, allowing for accurate separation of LCD panels and resolving issues of unsatisfactory sections, thereby improving production yield and enabling the realization of ultra slim border designs.
Implementation Method 1
a first light-shielding pattern is disposed on the first substrate, wherein a portion of the sidewall of the first light-shielding pattern is substantially aligned with a portion of the sidewall of the first substrate, and the first light-shielding pattern is only overlapped with an outer edge of the photo-curable sealant or is not overlapped with the photo-curable sealant
Implementation Method 2
The photo-curable sealant is disposed between the first substrate and the second substrate, wherein the photo-curable sealant surrounds and is in contact with the liquid crystal layer
Data Source
AI summary
A liquid crystal display (LCD) panel including a first substrate, a second substrate, a liquid crystal layer, a photo-curable sealant, and a first light-shielding pattern is provided. The liquid crystal layer is disposed between the first substrate and the second substrate. The photo-curable sealant is disposed between the first substrate and the second substrate, wherein the photo-curable sealant surrounds and is in contact with the liquid crystal layer. The first light-shielding pattern is disposed on the first substrate, wherein a portion of the sidewall of the first light-shielding pattern is substantially aligned with a portion of the sidewall of the first substrate, and the first light-shielding pattern is only overlapped with an outer edge of the photo-curable sealant or is not overlapped with the photo-curable sealant.