Display Panel Insulating Layer Alignment to Reduce Reflectivity
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Solution Overview
Problem
Current display panels have high reflectivity due to numerous contact surfaces with large refractive index differences, leading to reduced contrast ratios and display effects, especially in bright ambient light conditions.
Innovation Solution
The display panel design includes an array substrate and a color filter substrate with a liquid crystal layer in between, featuring specific layer configurations and materials to minimize reflectivity. The array substrate includes a first substrate, gate insulating layer, first and second interlayer insulating layers, and the color filter substrate includes a black matrix unit and color resist units, with careful alignment and material selection to reduce reflectivity.
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 increases due to large refractive index differences at contact surfaces
Solution Approach 1:
An intermediate layer with refractive index n3 is introduced between the first insulating layer (n1) and the second insulating layer (n2), where n1 < n3 < n2. This intermediate layer acts as a mediator that gradually transitions the refractive index, reducing the abrupt refractive index difference at the contact surface and thereby minimizing light reflection while maintaining the necessary electrical insulation between different potential regions.
Solution Approach 2:
The refractive index parameter is gradually changed across multiple layers rather than having abrupt transitions. By designing layers with progressively changing refractive indices (n1 < n3 < n2), the optical impedance mismatch is reduced, which decreases reflectivity. This parameter optimization allows the structure to maintain both electrical insulation functionality and reduced optical reflection.
2Adaptability or versatility
If multiple layers with different refractive indices are stacked, then the functional requirements are met, but light reflection and interference occur at interfaces
Solution Approach 1:
The intermediate layer serves as an optical mediator that reduces interference effects at interfaces. By providing a gradual refractive index transition, it minimizes the abrupt impedance changes that cause light reflection and interference, while still allowing the stacked structure to fulfill its electrical insulation and potential division functions.
Solution Approach 2:
Different layers are designed with specific local optical properties (refractive indices) optimized for their position in the stack. The intermediate layer specifically targets the interface region to reduce reflection, while other layers maintain their functional properties, creating a locally optimized structure that reduces overall reflectivity without compromising functional versatility.
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 effectively reduces the reflectivity of the display panel, improving the contrast ratio and display effect, even in bright ambient light conditions, by minimizing light reflection at contact surfaces between different layers.
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
Implementation Method 2
A main reason is that there are many layers in the display panel, and 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
Data Source
AI summary
A display panel is provided by the present disclosure. In the display panel of the present disclosure, a projection of a contact surface between a part of a second interlayer insulating layer and a part of a gate insulating layer on a first substrate does not coincide with a projection of a black matrix unit on the first substrate, thereby reducing reflection of the display panel to ambient light, improving a contrast ratio of the display panel, and improving a display effect of the display panel.