Array Substrate Insulating Layer Layout for Low-Reflectivity Displays
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Solution Overview
Problem
Current display panels have high reflectivity due to numerous contact surfaces with high reflectivities, leading to a decrease in contrast ratio and display effect.
Innovation Solution
An array substrate is designed with a specific configuration of interlayer insulating layers and a gate insulating layer, where the second interlayer insulating layer is made of the same material as the gate insulating layer, reducing reflectivity at contact surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple insulating layers are used in the display panel, then the electrical insulation performance is improved, but the reflectivity of the display panel increases
Solution Approach 1:
The patent applies local quality by making the second interlayer insulating layer have a different material composition (different refractive index) specifically in the opening area compared to the non-opening area. In the opening area, the second interlayer insulating layer uses a material with refractive index closer to the gate insulating layer, locally reducing reflectivity at the contact surface while maintaining electrical insulation functionality.
Solution Approach 2:
The patent changes the refractive index parameter of the insulating layer material in the opening area by selecting a different material for the second interlayer insulating layer. This parameter change reduces the refractive index difference between adjacent layers at the contact surface, thereby reducing reflectivity while preserving the electrical insulation function.
2Device complexity
If multiple contact surfaces with high reflectivity are present, then the structural complexity is reduced, but the contrast ratio decreases
Solution Approach 1:
The patent applies local quality by differentiating the material composition of the second interlayer insulating layer between the opening area and non-opening area. Specifically, in the opening area, it uses a material with refractive index closer to the gate insulating layer to reduce reflectivity, while in the non-opening area, it may use a different material optimized for other functions, thus maintaining structural simplicity while improving contrast ratio.
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 solution effectively reduces the reflectivity of the display panel, improves the contrast ratio, and enhances the display effect by minimizing reflections from ambient light.
Implementation Method 1
refractive indices of these layers are different. Therefore, when the light enters different layers, its angle will change, that is, there will be reflected lights. The reflected lights at different interfaces produce interference effects. A formula for a reflectivity of light entering different layers is: reflectivity (R)=(n1−n2)2/(n1+n2)2
Implementation Method 2
After natural light enters a display panel, the natural light has three main paths: transmission, absorption, and reflection. Therefore, when the light enters different layers, its angle will change, that is, there will be reflected lights.
Data Source
AI summary
An array substrate includes an opening area and a non-opening area, and further includes a first substrate, a gate insulating layer, a first interlayer insulating layer, and a second interlayer insulating layer. The gate insulating layer is disposed on the first substrate and located in the opening area and the non-opening area. The first interlayer insulating layer is disposed on a side of the gate insulating layer away from the first substrate and located in the non-opening area. The second interlayer insulating layer is disposed on a side of the first interlayer insulating layer away from the first substrate and located in the opening area and the non-opening area. A projection of the first interlayer insulating layer on the first substrate is tangent to or separated from a projection of the opening area on the first substrate. A display panel includes the array substrate.