Display Substrate Refractive Index Buffer Layers Light Extraction
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Solution Overview
Problem
Current liquid crystal display devices face challenges in achieving high liquid crystal light efficiency and display resolution due to the limitations of light extraction grating structures, which result in low collimation and increased manufacturing complexity, affecting pixel aperture ratio and competitiveness.
Innovation Solution
The implementation of a display substrate with an optical waveguide, a first buffer layer, and a second buffer layer, where the refractive indices differ, allowing for controlled light reflection and extraction, and a display panel design that includes a spacer pattern and reflective elements to enhance light efficiency and display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light extraction grating structures are used in liquid crystal display devices, then light extraction is achieved, but liquid crystal light efficiency is low and manufacturing complexity increases
Solution Approach 1:
The patent changes the refractive index parameters of buffer layers to optimize light extraction. By setting the first buffer layer with refractive index less than the optical waveguide and the second buffer layer with refractive index greater than the optical waveguide, the system achieves enhanced light extraction efficiency without complex manufacturing processes.
Solution Approach 2:
The patent divides the buffer structure into multiple layers with different refractive indices. The first buffer layer and second buffer layer are segmented to perform different optical functions, allowing efficient light extraction while maintaining manufacturing simplicity through standardized layer deposition processes.
2Loss of energy
If light extraction grating structures are used, then light extraction is enabled, but pixel aperture ratio decreases
Solution Approach 1:
By optimizing the refractive index parameters of the buffer layers, the patent achieves effective light extraction without requiring large grating structures that would reduce the pixel aperture ratio. The parameter optimization allows compact light extraction structures.
3Illumination intensity
If conventional light extraction methods are used, then light extraction is achieved, but collimation is poor
Solution Approach 1:
The patent applies different refractive index properties to different buffer layers to achieve localized optical control. The first buffer layer with lower refractive index and the second buffer layer with higher refractive index work together to provide both light extraction and collimation functions in specific regions, improving overall light quality without increasing structural complexity.
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 solution improves liquid crystal light efficiency by 5-6 times, increases market competitiveness, and simplifies manufacturing by reducing the need for polarizers and enhancing the pixel aperture ratio.
Implementation Method 1
the first portion is configured to allow light which propagates in the optical waveguide and irradiates on the first portion to be totally reflected
Implementation Method 2
a refractive index of the first buffer pattern is less than a refractive index of the optical waveguide, and a refractive index of the second buffer layer is greater than the refractive index of the optical waveguide
Data Source
AI summary
A display substrate is provided. The display substrate includes: an optical waveguide; a first buffer layer at a side of the optical waveguide, the first buffer layer including a first buffer pattern and a plurality of openings defined by the first buffer pattern; and a second buffer layer at a side of the optical waveguide provided with the first buffer layer and at least covering the plurality of openings, a refractive index of the first buffer pattern is less than a refractive index of the optical waveguide, and a refractive index of the second buffer layer is greater than the refractive index of the optical waveguide. A display panel and a display device are further provided.