Light-Curable Sealant Curing via Complementary Openings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods of attaching color filter layers to liquid crystal displays using light-curable sealants result in increased resistance of metal lines due to openings required for curing, leading to poor electrical performance and undesirable border width in display devices.
Innovation Solution
A pattern of openings in the black masking material on the color filter layer complements a pattern of openings in the metal lines, allowing ultraviolet light to cure the light-curable sealant from both sides, thereby maintaining the width of the metal lines and preventing leakage while ensuring strong adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If openings are formed in the metal lines to allow UV light curing of the sealant, then the sealant can be cured properly, but the resistance of the metal lines increases and electrical performance deteriorates
Solution Approach 1:
The patent divides the sealing structure into multiple segments: the sealant layer is segmented with openings that align with openings in the black masking layer, creating a distributed pattern of light transmission paths. This segmentation allows UV light to reach the sealant from multiple locations without requiring large openings in the metal lines, thus maintaining electrical performance while ensuring proper curing.
Solution Approach 2:
The black masking layer serves as an intermediary structure between the metal lines and the sealant. It contains openings that are strategically positioned to allow UV light passage while maintaining the structural integrity and electrical performance of the metal lines. The black masking layer mediates between the need for light transmission and the need for electrical conductivity.
2Manufacturing precision
If the width of the metal lines is increased to compensate for openings, then the resistance decreases, but the inactive border width increases
Solution Approach 1:
The patent applies local quality by creating openings in the metal lines only in specific regions where they overlap with the sealant layer, rather than uniformly across the entire metal line structure. This localized approach maintains the width and conductivity of metal lines in critical electrical regions while allowing sealant curing in the peripheral sealing regions.
3Reliability
If the sealant overlaps the metal lines, then the sealing is more comprehensive, but the openings in the metal lines are required for curing
Solution Approach 1:
The patent merges the opening patterns of the black masking layer and the metal lines into a complementary configuration. The openings in both layers are positioned to align with each other, creating a unified pattern that maximizes UV light transmission to the sealant while maintaining the structural and electrical integrity of the underlying layers.
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
This approach reduces the resistance of metal lines, maintains the effective width of conductive structures, and enhances the mechanical stability and robustness of the display by ensuring a strong adhesive bond without increasing the inactive border area.
Implementation Method 1
A light-curable sealant may be used to attach the color filter layer to the liquid crystal layer. The light-curable sealant may surround the liquid crystal material and may prevent leakage of liquid crystal material at the edges of the display.
Data Source
AI summary
An electronic device may have a display such as a liquid crystal display. The display may include a layer of liquid crystal material interposed between a color filter layer and a thin-film transistor layer. The thin-film transistor layer may be provided with capacitive touch sensor electrodes. Wide metal lines on the thin-film transistor layer may be used to inhibit parasitic capacitances during touch sensor mode. The color filter layer may include a layer of black masking material that surrounds the active display area. A light-curable adhesive may used to attach the color filter layer to the thin-film transistor layer. Openings may be formed in the black masking material and in the metal lines on the thin-film transistor layer. The adhesive may be cured by applying ultraviolet light to the adhesive through the openings in the black masking material and through the openings in the metal lines.