LCD Common Line Pattern Width for Sealant Curing
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Solution Overview
Problem
Conventional liquid crystal display devices experience seal detachment issues due to incomplete curing of the sealant caused by reduced light transmissivity, particularly when the transparent electrode pattern is present, leading to adhesive strength deterioration and potential sealant detachment, especially under extreme environmental conditions.
Innovation Solution
The liquid crystal display device features a common line pattern formed as micro-scale lines with a transparent electrode pattern having a width equal to or less than the common line pattern, ensuring maximum light transmissivity for effective curing of the conductive seal pattern, which is made of photo-curable resin, thereby enhancing adhesive strength between substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent electrode pattern is formed with a width greater than the common line pattern, then the electrode can effectively connect to the common electrode, but light transmissivity is reduced causing incomplete curing of the sealant and seal detachment
Solution Approach 1:
The transparent electrode pattern is segmented into multiple separate transparent electrode lines that are positioned to overlap with the common line pattern. This segmentation reduces the total width of the transparent electrode pattern while maintaining electrical connectivity, allowing sufficient light transmission for complete sealant curing.
Solution Approach 2:
The patent utilizes the vertical dimension by forming the transparent electrode pattern in a layered structure with the common line pattern and insulating layers. The transparent electrode pattern is positioned at a different vertical level, allowing it to maintain connectivity while minimizing horizontal width that would block light.
2Illumination intensity
If the transparent electrode pattern width is reduced to improve light transmissivity, then sealant curing is improved, but electrical connectivity to the common electrode may be compromised
Solution Approach 1:
An insulating layer is introduced as an intermediary between the common line pattern and the transparent electrode pattern. This insulating layer with contact holes allows the transparent electrode pattern to electrically connect to the common line pattern while maintaining a controlled width that permits sufficient light transmission for sealant curing.
Solution Approach 2:
The transparent electrode pattern is designed with non-uniform width characteristics - wider portions where electrical connectivity is critical and narrower portions where light transmission is prioritized. This local quality variation optimizes both electrical function and optical performance.
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 significantly increases the adhesive strength of the cured seal pattern, preventing seal detachment even under extreme conditions such as high temperature and high humidity, ensuring reliable display performance.
Implementation Method 1
curing the conductive seal pattern by transmitting ultraviolet light from the bottom of the first substrate
Data Source
AI summary
A liquid crystal display device and a method for manufacturing the same, are discussed. The liquid crystal display device includes first and second substrates each having an active area and a non-active area, gate lines and data lines formed on the active area of the first substrate to define a plurality of pixel areas, thin film transistors formed at intersections of the gate and data lines, pixel electrodes, a common electrode formed over the second substrate, a conductive seal pattern between the first and second substrates, a common line pattern formed on the first substrate to correspond to the conductive seal pattern, and a transparent electrode pattern overlapping the common line pattern with an insulating layer interposed therebetween, the transparent electrode pattern having a width equal to or less than that of the common line pattern.