LCD Gate Connection Short Prevention via Segmented Common Electrode
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Solution Overview
Problem
The gate-in-panel type LCD devices experience electrical shorts between the common electrode and the gate connection pattern due to the conductive ball in the seal pattern, leading to operational failures.
Innovation Solution
Incorporating a shortage-preventing pattern on the common electrode that corresponds to the gate connection pattern, and forming a seal pattern with a conductive ball to prevent electrical contact between the common electrode and the gate connection pattern, ensuring the substrates are attached such that the shortage-preventing pattern faces the gate connection pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a seal pattern with a conductive ball is used to attach substrates, then the substrates are securely bonded, but electrical shorts occur between the common electrode and the gate connection pattern
Solution Approach 1:
The common electrode is segmented into multiple isolated common electrode patterns, with insulating patterns positioned between them. This segmentation prevents the conductive ball from creating an electrical short between adjacent common electrode regions while maintaining the bonding function of the seal pattern.
Solution Approach 2:
An insulating pattern is introduced as an intermediary element between the common electrode patterns. This insulating pattern acts as a mediator that prevents direct electrical contact between the common electrode and the gate connection pattern through the conductive ball, while allowing the seal pattern to maintain mechanical bonding.
2Area of stationary object
If the common electrode and gate connection pattern are positioned close to each other, then the device area is reduced, but electrical shorts occur through the conductive ball in the seal pattern
Solution Approach 1:
The common electrode is divided into multiple isolated patterns separated by insulating patterns. This allows the common electrode patterns to be positioned close to the gate connection pattern for compact area, while the insulating patterns prevent electrical shorts through the conductive ball in the seal pattern.
Solution Approach 2:
Different regions of the electrode structure have different electrical properties: the common electrode patterns are conductive for electrical function, while the insulating patterns are non-conductive for electrical isolation. This local differentiation allows close positioning without shorts.
Data Source
AI summary
A liquid crystal display device comprises: a first substrate and a second substrate facing and spaced apart from each other, the first substrate and the second substrate including an active area, a signal input area and a pad area, the signal input area and the pad area being disposed at a periphery of the active area; a gate line and a data line on the first substrate in the active area, the gate line and the data line crossing each other; first connection lines and second connection lines in the signal input area, the first connection lines extending to the pad area and crossing the second connection lines; a gate connection pattern contacting the first connection lines and the second connection lines; a common electrode on the second substrate; a shortage-preventing pattern on the common electrode and corresponding to the gate connection pattern; a seal pattern surrounding the active area, the seal pattern including a conductive ball; and a liquid crystal layer between the first and second substrates in the seal pattern.