Nested Sealed Wiring for Electrostatic Protection in Display Devices
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Solution Overview
Problem
Active-matrix-type liquid crystal devices face challenges in protecting thin film transistors from electrostatic damage during manufacturing and usage, which affects reliability and yield.
Innovation Solution
The electro-optical device incorporates a configuration with multiple sealed wiring portions surrounding the display region, electrically connected to a common electrode, and an electrostatic protection circuit using MOS diodes, which enhances resistance to static electricity and can be formed simultaneously with the pixels, improving manufacturing efficiency and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sealed wiring portion is used to protect switching elements, then the structure is simple and manufacturing is easy, but the resistance to static electricity is insufficient
Solution Approach 1:
The patent implements a nested protection structure where a first sealed wiring portion surrounds the display region, and a second sealed wiring portion surrounds the first sealed wiring portion. This nested configuration creates multiple protective layers that sequentially discharge static electricity, significantly enhancing protection without requiring completely separate protective systems.
Solution Approach 2:
The protection structure is divided into segmented components: the first sealed wiring portion connected to a first electrostatic protection circuit, and the second sealed wiring portion connected to a second electrostatic protection circuit. This segmentation allows each component to perform its protection function independently while collectively providing comprehensive static electricity resistance.
2Reliability
If multiple sealed wiring portions and electrostatic protection circuits are added, then the resistance to static electricity is significantly increased, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent merges the formation of sealed wiring portions with the formation of pixel electrodes by using the same transparent conductive material and processing steps. The electrostatic protection circuits are also integrated into the existing transistor fabrication process. This merging allows multiple protective and functional elements to be created simultaneously, maintaining high manufacturing efficiency while achieving enhanced static electricity resistance.
Data Source
AI summary
An electro-optical device having a display region in which a plurality of pixels are arranged in a matrix includes: switching elements each corresponding to one the plurality of pixels; a first sealed wiring portion that is formed on an element substrate so as to surround at least three sides of the display region; and a second sealed wiring portion that surrounds the first sealed wiring portion.