Transparent Gate Pad for Organic TFT LCD Corrosion Resistance
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Solution Overview
Problem
In liquid crystal display devices with organic thin film transistors, the metallic gate pads are prone to misalignment and corrosion during the tape automated bonding (TAB) packaging process, leading to structural damage and reliability issues.
Innovation Solution
The use of a gate pad structure formed from a transparent conductive material, either as a single-layered or double-layered structure, where the gate pad terminal is made of transparent conductive material covering the metallic gate pad, preventing misalignment and corrosion during the packaging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic gate pads are used in the array substrate, then electrical conductivity is improved, but the gate pads are prone to misalignment and corrosion during the TAB packaging process
Solution Approach 1:
The gate pad structure uses a composite of transparent conductive material (such as ITO) and metallic material (such as AlNd). The transparent conductive material layer provides corrosion resistance and structural stability during TAB packaging, while the metallic material layer provides electrical conductivity. This composite structure resolves the contradiction between reliability and susceptibility to corrosion/misalignment.
2Object-affected harmful factors
If transparent conductive material is used to cover the metallic gate pad, then corrosion resistance is improved, but the device complexity increases
Solution Approach 1:
The gate pad is segmented into two functional layers: a transparent conductive material layer for corrosion resistance and a metallic material layer for electrical conductivity. This segmentation allows each layer to perform its specific function optimally while maintaining overall simplicity through a straightforward two-layer configuration that is integrated into the existing manufacturing process.
Data Source
AI summary
An array substrate for an organic thin film transistor liquid crystal display device includes a substrate; a data line on the substrate; a first gate line crossing the data line to define a pixel region; an organic thin film transistor electrically connected to the first gate line and the data line, the organic thin film transistor including source and drain electrodes, an organic semiconductor layer on the source and drain electrodes, a gate electrode on the organic semiconductor layer; a pixel electrode in the pixel region and connected to the drain electrode; a gate pad terminal electrically connected to the first gate line and formed of a transparent conductive material; a data pad terminal electrically connected to the data line and formed of a transparent conductive material; and a passivation layer covering the organic thin film transistor and exposing the pixel electrode, the gate pad terminal, and the data pad terminal.