Narrow Black Matrix Liquid Crystal Display Device
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Solution Overview
Problem
Liquid crystal display devices face a challenge in minimizing the black matrix region to increase the effective display area while maintaining image quality and preventing image leakage.
Innovation Solution
The design incorporates a liquid crystal display device with a narrow black matrix, utilizing transparent and non-transparent conductive materials for conduction lines arranged in different planes, with overlapping regions to minimize the black matrix width and ensure adequate UV curing of the sealant, thereby reducing the shielded region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the black matrix region is reduced to increase effective display area, then the effective display area increases, but image leakage prevention becomes more difficult
Solution Approach 1:
The patent transitions from a single-plane conduction line structure to a multi-plane structure with first conduction lines on the first substrate and second conduction lines on the second substrate. This dimensional change allows the conduction lines to overlap in the vertical direction, enabling the black matrix to be positioned only in the horizontal overlap region while maintaining electrical connectivity, thus reducing the black matrix width without compromising image leakage prevention
Solution Approach 2:
The patent combines multiple conduction lines (first conduction lines and second conduction lines from opposite substrates) into a single functional conduction path through overlapping. This merging allows the electrical connection to be achieved through the overlap region rather than requiring separate non-overlapping paths, enabling the black matrix to be confined to the minimal necessary overlap area
2Area of stationary object
If the black matrix width is reduced, then the effective display area increases, but UV curing of the sealant becomes insufficient
Solution Approach 1:
By arranging conduction lines on different substrates (different planes), the patent creates a multi-layer structure where UV light can penetrate through transparent conduction lines from the first substrate side to cure the sealant, while the black matrix on the second substrate provides shielding where needed. This dimensional separation resolves the conflict between narrow black matrix and adequate UV curing
Solution Approach 2:
The patent applies different material properties to different conduction lines: transparent conduction materials (such as ITO) are used where UV penetration is needed for sealant curing, while non-transparent conductive materials are used where shielding is prioritized. This local differentiation of material quality allows simultaneous achievement of UV curing and image leakage prevention
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 configuration effectively reduces the black matrix width, enhances UV curing of the sealant, and prevents image leakage, thereby increasing the effective display area while maintaining image quality.
Implementation Method 1
at least one kind of conduction lines selected from the group consisting of first conduction lines and second conduction lines is formed of a transparent conductive material
Data Source
AI summary
A liquid crystal display device has a narrow black matrix located outside an effective display region. The device includes a first substrate, a second substrate, first conduction lines spaced apart from each other on a surface of the first substrate facing the second substrate, a first insulating layer covering the first conduction lines, second conduction lines spaced apart from each other on the first insulating layer and formed in regions corresponding to intervals of the first conduction lines, a second insulating layer covering the second conduction line, a sealant interposed between the second insulating layer and the second substrate and overlapping at least a portion of the first and second conduction lines, and a black matrix interposed between the second substrate and the sealant and overlapping the first and second conduction lines and the sealant. At least one kind of conduction lines is formed of a transparent conductive material.