Anti-reflective Substrate with Optical Path Control Structure
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Solution Overview
Problem
In LCDs where the array substrate is on the ambient light side and the color filter substrate is on the backlight side, the reflection of ambient light by the gate and source/drain metal layers significantly impacts the user's viewing experience, and existing anti-reflective films that reduce reflection often increase backlight power consumption and affect transmittance.
Innovation Solution
An anti-reflective substrate with a multi-layered film structure featuring convex and concave pyramid portions, where the first film is a silicon nitride film and the second film is an amorphous silicon film, configured to create an optical path control structure that totally reflects incident light back into the substrate, reducing ambient light reflection without affecting transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-reflective film is applied to reduce ambient light reflection, then the reflection is reduced, but the transmittance is affected and power consumption increases
Solution Approach 1:
The anti-reflective film is segmented into a multi-layered structure with different materials (first film and second film) and different geometric features (convex portions and concave portions). This segmentation allows each layer to perform specific optical functions, achieving effective anti-reflection while maintaining transmittance and avoiding increased power consumption.
Solution Approach 2:
The film structure is designed with local quality variations through the convex and concave portions that are selectively positioned. The convex portions of the first film and concave portions of the second film create localized optical path differences, enabling the film to reduce reflection at specific locations without compromising overall transmittance.
2Object-affected harmful factors
If a conventional anti-reflective film is used, then reflection is reduced, but transmittance is affected
Solution Approach 1:
The anti-reflective film uses a composite material structure consisting of a first film and a second film with different material properties. This composite structure enables the film to simultaneously achieve reflection reduction and transmittance maintenance by utilizing the complementary optical characteristics of different materials in different layers.
Solution Approach 2:
The invention introduces geometric dimensionality through the convex and concave portions of the film layers. By creating three-dimensional surface features rather than using a flat film, the optical path of incident light is controlled in a new dimension, allowing reflection reduction without blocking transmittance.
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 minimizes ambient light reflection, enhancing the user's viewing experience while maintaining low power consumption by ensuring that the anti-reflective film only covers the metal layers on the array substrate, thus preserving the display's transmittance and reducing power consumption.
Implementation Method 1
twice of the angle between the bottom surface and the side surface of the convex portion is substantially larger than the critical angel of the light emitted from the base substrate towards the air
Data Source
AI summary
The present disclosure provides an anti-reflective substrate and a method for preparing the same, an array substrate, and a display device. The anti-reflective substrate includes a base substrate and an anti-reflective film having an optical path control structure. The anti-reflective film is disposed on the base substrate, and the optical path control structure is configured to reduce a reflection of an incident light from a side of the base substrate on which the anti-reflective film is disposed.