TFT Substrate Wire Protection via Protective Conductor Lines
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Solution Overview
Problem
In liquid crystal display devices, mechanical impacts during assembly or cutting processes can cause the protective film to be scraped off, exposing wires and leading to corrosion, especially around terminals, which can result in deteriorated electric conductivity and potential short circuits if a conductive protective member is used.
Innovation Solution
The implementation of protective conductor lines made of transparent conductive oxide and metal films, strategically placed across the boundary between overlap and non-overlap parts on the substrate, which are electrically connected to the wires and covered by additional protective films to prevent mechanical damage and corrosion, while avoiding short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective member made of resin is provided to a part corresponding to a cutting line, then mechanical protection is improved, but electrical conductivity protection deteriorates
Solution Approach 1:
The protective member is constructed as a composite structure with a resin base layer providing mechanical protection and a transparent conductive oxide layer providing electrical conductivity protection. This composite material approach allows both mechanical strength and electrical conductivity to be maintained simultaneously.
Solution Approach 2:
The protective member changes its electrical parameter by incorporating a transparent conductive oxide layer that provides conductive properties to the otherwise insulating resin material. This parameter change enables the protective member to function both mechanically and electrically.
2Reliability
If a protective member contains conductive material, then electrical conductivity protection is improved, but short circuit risk increases
Solution Approach 1:
The conductive material is applied locally only where needed - specifically on the surface of the protective member at the cutting line position where wire exposure risk is highest. This localized application provides electrical protection without creating unnecessary conductive paths that could cause short circuits.
Solution Approach 2:
The transparent conductive oxide layer acts as an intermediary between the insulating resin protective member and the conductive wire. It provides electrical conductivity protection while maintaining the insulating properties of the base resin, preventing direct contact between conductive materials.
3Productivity
If the protective film is scraped off during assembly or cutting processes, then manufacturing efficiency is improved, but wire protection deteriorates
Solution Approach 1:
The protective member with its conductive oxide coating is pre-applied to the substrate before the cutting process. This preliminary protective action ensures that even if the protective film is scraped off during assembly or cutting, the underlying wire remains protected by the durable protective member with its conductive properties.
Solution Approach 2:
The protective member serves as a beforehand cushioning layer that absorbs mechanical impacts and scraping during manufacturing processes. Its conductive oxide coating provides prior electrical protection, cushioning against the harmful effects of film removal while maintaining manufacturing efficiency.
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 solution effectively enhances the protection of wires connected to terminals, preventing corrosion and short circuits by ensuring continuous coverage and electrical connectivity without compromising conductivity.
Implementation Method 1
a first protective film covering the plurality of wires, a plurality of protective conductor lines formed on the first protective film
Implementation Method 2
The plurality of protective conductor lines are electrically connected to the plurality of wires
Data Source
AI summary
To provide a liquid crystal display device capable of improving protection of a wire connected to a group of terminals, a TFT substrate has, on the side of a liquid crystal layer, a plurality of wires extending from an overlap part A to a non-overlap part B, a protective film covering the plurality of wires, a plurality of protective conductor lines formed on the protective film, each corresponding to each wire and lying across the boundary between the overlap part A and the non-overlap part B, a protective film covering the plurality of protective conductor lines, and a group of terminals formed on the non-overlap part B and connected to the plurality of wires.