LCD Driving Line Spacing for UV Seal Curing
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Solution Overview
Problem
In liquid crystal display (LCD) devices, particularly in small-sized panels, the seal pattern is often insufficiently cured due to a high area proportion of driving lines, leading to contamination of the liquid crystal layer and attachment issues during the fabrication process, as the reduced distance between driving lines can cause electrical shorting and hinder uniform UV curing.
Innovation Solution
The implementation of a configuration where driving lines are classified into first and second lines with different horizontal separations, allowing for a seal pattern of ultraviolet curable material to overlap some driving lines while others are exposed, ensuring sufficient UV curing by maintaining an area proportion of driving lines below 50% in the seal area, thereby preventing electrical shorting and ensuring uniform curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distance between driving lines is reduced to minimize non-display area, then the area proportion of driving lines increases and non-display area is reduced, but the seal pattern cannot be uniformly cured and electrical shorting occurs
Solution Approach 1:
The patent segments the driving lines into two categories: first driving lines that are exposed through the seal pattern and second driving lines that are overlapped by the seal pattern. This segmentation allows different spacing arrangements for different functional groups of driving lines, enabling the seal pattern to be uniformly cured while maintaining minimal non-display area.
Solution Approach 2:
The patent applies different horizontal spacing to different regions: a first distance between first driving lines that are exposed through the seal pattern, and a second distance between second driving lines that are overlapped by the seal pattern. This local differentiation of spacing quality enables the seal pattern to receive sufficient UV irradiation for uniform curing in overlapped regions while maintaining compact overall layout.
2Manufacturing precision
If the distance between driving lines is reduced to improve pixel density, then manufacturing precision is improved, but the seal pattern curing is insufficient and contamination occurs
Solution Approach 1:
By segmenting driving lines into exposed and overlapped groups with different spacing, the patent ensures that regions under the seal pattern have sufficient spacing for uniform UV curing, preventing incomplete curing that would lead to contamination of the liquid crystal layer.
3Length of moving object
If driving lines are closely spaced to reduce panel size, then device miniaturization is achieved, but UV curing uniformity deteriorates and attachment issues arise
Solution Approach 1:
The patent implements local quality differentiation by applying different horizontal spacing rules to different groups of driving lines based on their relationship with the seal pattern. This allows the panel to be miniaturized overall while ensuring that critical regions under the seal pattern maintain sufficient spacing for reliable UV curing and attachment.
4Area of stationary object
If the area proportion of driving lines is increased to reduce non-display area, then space utilization is improved, but UV ray transmission is blocked and curing is insufficient
Solution Approach 1:
The patent segments driving lines into exposed and overlapped categories, allowing UV rays to pass through exposed regions for efficient curing while maintaining compact overall layout. This segmentation optimizes UV ray transmission efficiency by ensuring that sufficient area is exposed for direct irradiation.
Solution Approach 2:
By applying different spacing strategies to different regions, the patent creates local quality variations that optimize UV transmission: exposed driving lines have spacing that allows UV penetration, while overlapped driving lines are positioned where the seal pattern provides necessary coverage, achieving both compact design and effective curing.
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 ensures a uniformly cured seal pattern, preventing contamination and attachment issues, and reduces the non-display area, thereby improving the efficiency and reliability of the LCD fabrication process.
Implementation Method 1
a seal pattern of an ultraviolet curable material in the non-display area, the seal pattern overlapping the third and fourth driving lines
Data Source
AI summary
A liquid crystal display device includes: first and second substrates facing and spaced apart from each other, the first and second substrates having; first to fourth driving lines in the non-display area over the first substrate, the first and second driving lines horizontally separated by a first distance, and the third and fourth driving lines horizontally separated by a second distance greater than the first distance; a seal pattern of an ultraviolet curable material in the non-display area, the seal pattern overlapping the third and fourth driving lines; and a liquid crystal layer inside the seal pattern between the first and second substrates.