Liquid Crystal Display Alignment Layer Stopper Oxidation Prevention
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Solution Overview
Problem
In liquid crystal display devices, the alignment layer stopper formed of conductive thin film can oxidize or dissolve due to water and electric fields, leading to signal line degradation and potential display failures, especially in high-temperature, high-humidity environments.
Innovation Solution
A liquid crystal display device design featuring an alignment layer stopper made of a hydrophobic thin film material with a second conductive layer above and a first conductive layer below, separated by an insulating film, where the first conductive layer is exposed along the signal lines to suppress electric fields and prevent oxidation or dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the alignment layer stopper is formed of a conductive thin film to prevent resin flow, then the alignment layer formation is improved, but the signal line reliability deteriorates due to oxidation and dissolution
Solution Approach 1:
The alignment layer stopper is divided into multiple conductive layers (first conductive layer and second conductive layer) separated by an insulating film. This segmentation prevents direct contact between the stopper and signal lines, eliminating the oxidation and dissolution problems while maintaining the alignment layer formation function.
Solution Approach 2:
An insulating film is introduced as an intermediary between the conductive thin film stopper and the signal lines. This intermediary layer prevents direct interaction between water/humidity and the conductive stopper, thereby preventing oxidation and dissolution of the signal lines while allowing the stopper to maintain its alignment layer formation function.
2Volume of moving object
If the separation distance between seal material and alignment layer is reduced for smaller frame size, then the device compactness is improved, but the sealing reliability deteriorates
Solution Approach 1:
The conductive stopper structure with insulating film acts as an intermediary barrier that allows the alignment layer to be formed closer to the seal material without compromising sealing reliability. The stopper prevents resin flow into the seal area while the insulating film ensures electrical isolation, enabling compact design without sacrificing sealing function.
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 solution effectively suppresses electric fields between signal lines and the alignment layer stopper, preventing signal line degradation and enhancing the reliability and yield of liquid crystal display devices, even in challenging environmental conditions.
Implementation Method 1
a first conductive layer SH arranged below the second conductive layer SP through an insulating film
Implementation Method 2
the alignment layer stopper is made of a thin film material having hydrophobic nature for a liquid alignment layer material
Data Source
AI summary
A liquid crystal display device having an alignment layer stopper which is formed external to a display area to suppress the generation of an electric field between signal lines and the alignment layer stopper, wherein the alignment layer stopper includes a second conductive layer SP formed above the first substrate when the alignment layer stopper is formed by coating and a first conductive layer SH formed below the second conductive layer SP through an insulating film and arranged in such a manner that its marginal parts in the longitudinal direction of the second conductive layer SP are exposed when viewed from the plane direction from the second conductive layer SP, and the first conductive layer SH is formed in a thin film layer between signal lines arranged in the side parts of the display area and the second conductive layer SP.