Array Substrate Alignment Mark Layout Under Light-Shielding Layers
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Solution Overview
Problem
The alignment mark on array substrates is easily shielded by light-shielding materials during the preparation of display panels, leading to positioning deviations and reduced yield due to the difficulty in determining the specific position of the alignment mark.
Innovation Solution
An array substrate design that includes a substrate, an alignment mark, a mark covering layer, and a light-shielding layer, where the mark covering layer has higher transmittance than the light-shielding layer and is in contact with it, allowing the alignment mark to be exposed and used for positioning during subsequent layer preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding layer is applied over the alignment mark to prevent light interference, then light shielding performance is improved, but the alignment mark becomes hidden and positioning accuracy deteriorates
Solution Approach 1:
The light-shielding layer is segmented by creating a light-shielding hole that exposes the alignment mark, allowing the layer to simultaneously shield light in most areas while maintaining visibility of the alignment mark for positioning
Solution Approach 2:
The alignment mark serves as an intermediary element that bridges the conflicting requirements of light shielding and positioning visibility, being selectively exposed through the light-shielding layer via the light-shielding hole
2Measurement precision
If the alignment mark is fully exposed to maintain positioning visibility, then positioning accuracy is improved, but light interference increases causing preparation yield to deteriorate
Solution Approach 1:
The light-shielding layer is divided into a light-shielding portion and a light-shielding hole, creating a segmented structure that selectively blocks light while preserving alignment mark visibility for positioning
Solution Approach 2:
The light-shielding layer exhibits different optical properties in different locations: it is opaque in the light-shielding portion to prevent light interference, and transparent/open in the light-shielding hole to allow alignment mark visibility
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 design improves the accuracy of layer positioning and increases the preparation yield of display panels by ensuring the alignment mark remains visible despite the application of light-shielding layers, reducing the risk of alignment errors.
Implementation Method 1
A transmittance of the light-shielding layer is less than a transmittance of the mark covering layer
Data Source
AI summary
Provided are an array substrate, a preparation method thereof, a display panel, and a display device. The array substrate includes a substrate, an alignment mark, a mark covering layer, and a light-shielding layer. The alignment mark is disposed on a side of the substrate. The mark covering layer is disposed on a side of the alignment mark facing away from the substrate. The mark covering layer at least partially overlaps the alignment mark. The transmittance of the light-shielding layer is less than the transmittance of the mark covering layer. The light-shielding layer is in contact with the mark covering layer and exposes at least a portion of the mark covering layer.