Array Substrate Insulating Layer for Aperture Ratio
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Solution Overview
Problem
In TFT-LCDs of the ADS mode, the increased distance between the common electrode and the gate electrode to prevent short circuits reduces the aperture ratio due to wider black matrices, compromising light transmittance and image quality.
Innovation Solution
An insulating layer is introduced between the common electrode and the gate electrode, allowing for a reduced distance between them while maintaining electrical isolation, even with residual materials from etching processes, thus preventing short circuits and enhancing aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the common electrode and the gate electrode is increased to prevent short circuits, then the reliability is improved, but the aperture ratio is reduced
Solution Approach 1:
An insulating layer is introduced as an intermediary between the common electrode and the gate electrode. This insulating layer provides electrical isolation to prevent short circuits while allowing the electrodes to be positioned closer together, thus maintaining a high aperture ratio without compromising reliability.
2Reliability
If the distance between the common electrode and the gate electrode is increased to prevent short circuits, then the reliability is improved, but the light transmitting region is reduced
Solution Approach 1:
The insulating layer serves as a mediator that enables electrical isolation between the common electrode and gate electrode without requiring increased spacing. This allows the light transmitting region to remain large while still preventing short circuits through the insulating barrier.
3Reliability
If the width of the black matrix is increased to prevent short circuits, then the reliability is improved, but the aperture ratio is reduced
Solution Approach 1:
The insulating layer acts as an intermediary that provides the necessary electrical isolation without requiring an increased black matrix width. This enables the aperture ratio to be maintained at a high level while still achieving reliable short circuit prevention through the insulating barrier.
Data Source
AI summary
An array substrate, a method for manufacturing the same and a display apparatus are provided. The array substrate comprises: a substrate (1); a common electrode (2) and a pixel electrode (10) sequentially formed on the substrate (1) and insulated from each other; a thin film transistor comprising a gate electrode (4), an active layer (7), a source electrode (8a) and a drain electrode (8b), wherein the drain electrode (8b) is electrically connected with the pixel electrode (10); a common electrode line (5) disposed in a same layer as the gate electrode (4); and an insulating layer (3) between the gate electrode (4) and the common electrode (2), wherein the common electrode (2) is connected with the common electrode line (5) through a through hole in the insulating layer (3).