Array Substrate Direct Contact Eliminates Contact Resistance
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Solution Overview
Problem
Existing array substrates face challenges in achieving uniform charge distribution between common electrodes and pixel electrodes due to large contact resistance generated when metals in through holes make contact with pixel electrodes.
Innovation Solution
The array substrate design features direct contact between the drain electrode of the TFT and the pixel electrode, with a connecting portion between the drain electrode and the gate insulation layer, eliminating the need for through holes and thus eliminating contact resistance, ensuring uniform charge distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metals in through holes are used to connect drain electrode and pixel electrode, then electrical connection is achieved, but large contact resistance is generated
Solution Approach 1:
The patent removes the through-hole structure and the metal filling material from the connection path between the drain electrode and pixel electrode. By extracting this intermediate component, the design achieves direct contact between the drain electrode and pixel electrode, eliminating the contact resistance that was inherent in the through-hole metal connection approach.
2Reliability
If through holes with metal are used for connection, then electrical connection is established, but uniform charge distribution cannot be achieved
Solution Approach 1:
The patent eliminates the through-hole metal structure that caused non-uniform charge distribution. By removing this intermediate layer, the design allows for uniform charge distribution between the common electrode and pixel electrode, as the direct contact interface provides consistent electrical properties across the connection area.
3Object-affected harmful factors
If direct contact between drain electrode and pixel electrode is implemented, then contact resistance is eliminated, but structural complexity increases
Solution Approach 1:
The patent merges the drain electrode and pixel electrode into a single continuous conductive structure by eliminating the through-hole interface. This consolidation reduces the number of discrete components and interfaces, thereby simplifying the overall structure while achieving direct contact and eliminating contact resistance.
Data Source
AI summary
An array substrate includes a display area and a peripheral area adjacent to the display area; the display area includes a plurality of pixel units; each pixel unit includes a thin-film transistor (TFT) and a pixel electrode; and a drain electrode of the TFT directly contacts with the pixel electrode. In the array substrate, the drain electrode of the TFT directly contacts with the pixel electrode, and hence a uniformly distributed electric field will be generated between common electrodes and the pixel electrodes.