Array Substrate Light Shielding Layer for Display Opening Ratio
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Solution Overview
Problem
The existing display panel technology faces issues with light leakage due to lateral electrical fields generated by metal electrodes/wires, which are addressed by using a black matrix on the color filter substrate, but this design often results in a larger black matrix size, decreasing the opening ratio of the display panel due to positional offsets during cell-assembling.
Innovation Solution
An array substrate with a pixel array structure that includes a light shielding layer made of a light shielding material, strategically positioned to overlap or cover parts of the source/drain metal layers, gate metal layers, and channel regions of the TFT, effectively blocking light and reducing reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is disposed on the color filter substrate to prevent light leakage, then light leakage is reduced, but the opening ratio of the display panel decreases
Solution Approach 1:
The light shielding function is segmented between two components: a light shielding layer on the array substrate and a reduced-size black matrix on the color filter substrate. The light shielding layer covers metal electrode regions to block lateral electrical field effects, while the black matrix is minimized to only necessary areas, thus preventing light leakage while maximizing the opening ratio.
Solution Approach 2:
The light shielding function is moved from the color filter substrate alone to include the array substrate side. By adding the light shielding layer on the array substrate in a different spatial dimension (layer), the system achieves effective light leakage prevention without requiring a large black matrix area on the color filter substrate.
2Object-affected harmful factors
If the size of the black matrix is increased to account for positional offsets during cell-assembling, then light leakage prevention is improved, but the opening ratio decreases
Solution Approach 1:
The light shielding responsibility is divided between the light shielding layer on the array substrate and a minimized black matrix on the color filter substrate. The light shielding layer handles the primary light blocking function with precise positioning, allowing the black matrix to be reduced to minimal necessary dimensions, thus accommodating assembly offsets without sacrificing opening ratio.
Solution Approach 2:
The light shielding function is effectively copied from the traditional single black matrix approach to a dual-component system. The light shielding layer replicates the light-blocking capability on the array substrate side, enabling the black matrix to be minimized while maintaining overall light leakage prevention performance.
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
The light shielding layer enhances the display effect by reducing light leakage and improving the performance of the TFT, while allowing for a smaller black matrix size, thus increasing the opening ratio of the display panel without the need for a counter substrate's color filter layer.
Implementation Method 1
the pixel array structure comprises at least one light shielding layer made of a light shielding material... effectively blocking light and reducing reflections
Data Source
AI summary
An array substrate, a display device, and a method for manufacturing the array substrate are disclosed. The array substrate includes a base substrate and a pixel array structure disposed on the base substrate, the pixel array structure includes at least one light shielding layer made of a light shielding material, and the light shielding material can prevent light leakage or light reflection, thereby increasing an opening ratio of the display device.