Shield Electrode for LCD Gate Extraction Wiring
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Solution Overview
Problem
Horizontal electric-field type liquid crystal display apparatuses suffer from display non-uniformity near gate extraction wirings due to potential variations caused by electric fields, and the shield electrodes used to mitigate this issue are prone to corrosion when exposed to moisture.
Innovation Solution
A configuration where a conductive film covers the gate extraction wiring with a first insulation film, extending to the outer area of the seal material and covered by a second insulation film to shield electric fields and prevent corrosion, applying the same electrical potential as the opposite electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shield electrode is provided on the gate extraction wiring to suppress electric field interference, then display non-uniformity is reduced, but the shield electrode is exposed to moisture and prone to corrosion
Solution Approach 1:
An insulation film is introduced as an intermediary layer between the shield electrode and the external environment (moisture). This mediator protects the shield electrode from corrosion while maintaining its electric field shielding function, resolving the contradiction between display uniformity and corrosion resistance
Solution Approach 2:
The insulation film acts as a sacrificial protective layer that can be easily applied and replaced if needed, protecting the more critical shield electrode from direct exposure to moisture and corrosion
2Illumination intensity
If the pixel electrodes and opposite electrodes are arranged with vertical overlap in FFS type, then light transmissivity is improved, but potential variation occurs due to electric field from gate extraction wiring
Solution Approach 1:
The shield electrode is extracted and placed specifically on the gate extraction wiring area to isolate and counteract the electric field interference from this specific source, protecting the display uniformity while maintaining the FFS electrode configuration for high light transmissivity
Solution Approach 2:
The shield electrode is selectively positioned only where needed (on the gate extraction wiring) rather than across the entire display, providing localized protection against electric field interference while maintaining overall display 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 effectively suppresses display non-uniformity near gate extraction wirings and prevents corrosion of the shield electrode, improving the reliability and visual quality of the liquid crystal display apparatus.
Implementation Method 1
a conductive film that covers the gate extraction wiring with sandwiching a first insulation film therebetween... the conductive film is applied with an electrical potential of the opposite electrode
Implementation Method 2
a second insulation film that covers the conductive film in at least part of the outer area of the seal material
Data Source
AI summary
A liquid crystal display apparatus includes: an array substrate; a seal material; and an opposite substrate, wherein the array substrate includes: a plurality of thin film transistors formed in correspondence to respective intersection parts of a plurality of gate wirings and a plurality of source wirings; a pixel electrode connected to the thin film transistor; an opposite electrode formed to face the pixel electrode; a gate extraction wiring that connects the gate wirings and a connection terminal formed in an outer area of the seal material; a conductive film that covers the gate extraction wiring with sandwiching a first insulation film therebetween; and a second insulation film that covers the conductive film in at least part of the outer area of the seal material, and wherein the conductive film is applied with an electrical potential of the opposite electrode.