LCD Sealant Junction Electrode Placement
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices face challenges in reducing the area of the frame region while maintaining reliability, as the first electrode and circuit portion often overlap, leading to potential leakage and increased frame area due to the need for electric connection through conductive members in the sealant.
Innovation Solution
The LCD device incorporates a first electrode that overlaps the junction or crossing portion of the sealant, allowing it to be positioned closer to the outside, reducing the frame region area and preventing overlap with the circuit portion, while also using sub-electrodes for static electricity discharge, thereby enhancing reliability and reducing the frame area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first electrode is positioned inside the sealant formation region to ensure electrical connection, then the electrical connection between first electrode and second electrode is improved, but the frame region area increases and overlap with circuit portion occurs causing leakage risk
Solution Approach 1:
The patent positions the first electrode to overlap the junction portion of the sealant in the plan view, utilizing the vertical dimension and the specific geometric configuration of the sealant junction to achieve electrical connection without increasing the horizontal frame region area. This dimensional approach allows the electrode to be effectively placed at the boundary rather than inside the sealant region.
Solution Approach 2:
The patent applies different functional zones within the sealant structure by specifically targeting the junction portion (where sealant lines intersect) for electrode placement. This local quality approach utilizes the unique properties of the junction region to achieve both electrical connection and space optimization simultaneously.
2Area of stationary object
If the first electrode overlaps the circuit portion to reduce frame area, then the frame region area is reduced, but leakage between first electrode and circuit portion occurs reducing reliability
Solution Approach 1:
The patent designates the sealant junction portion as a special functional zone with unique electrical and spatial properties. By placing the first electrode specifically at this junction region, the invention creates a localized area that serves both as an electrical connection point and as a boundary marker that prevents overlap with the circuit portion, thus maintaining insulation reliability while minimizing frame area.
3Reliability
If the sealant is formed by dispenser method with wider seal junction portion, then the sealing reliability is improved, but the frame region area increases
Solution Approach 1:
The patent accepts the wider seal junction portion formed by the dispenser method as a beneficial feature for sealing reliability, but strategically places the first electrode at the junction portion to convert this previously problematic wide region into a functional advantage for electrical connection, thereby eliminating the need to reduce the junction width and maintaining both sealing and electrical performance.
Solution Approach 2:
The patent converts the wider seal junction portion, which traditionally would increase frame area, into a beneficial feature by placing the first electrode at this junction. The wider junction provides better sealing while simultaneously serving as the optimal location for electrical connection, thus transforming a potential disadvantage into an advantage.
Data Source
AI summary
A sealant contains a plurality of conductive members, and is formed in a closed pattern, when viewed from a direction normal to a surface of a first substrate or a second substrate. A second electrode is formed on a surface located on the first substrate side of the second substrate, and a first electrode, which is provided so as to face a part of the second electrode, and is electrically connected to the second electrode through the conductive members contained in the sealant, is formed over the first substrate. The first electrode is provided so as to at least partially overlap a crossing portion of the sealant.