Display Optical Layer Patterning for Uniform Brightness
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Solution Overview
Problem
Existing display devices with polymer dispersed liquid crystal (PDLC) layers face issues with non-uniform brightness and reduced reliability due to the adhesion of low-refractive index materials, leading to light scattering and decreased display quality.
Innovation Solution
The manufacturing method involves forming a transparent layer with higher oil repellency than the substrate and a low-refractive index layer with specific geometric configurations to guide light uniformly, using materials like fluorine-based resin and siloxane resin, respectively, to enhance light transmission and reduce scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a low-refractive index material is used in the display device, then light scattering is reduced and light transmission is improved, but adhesion problems occur leading to non-uniform brightness and reduced reliability
Solution Approach 1:
A transparent layer with intermediate oil repellency is introduced between the substrate and the low-refractive index material. This intermediary layer has higher oil repellency than the substrate but lower oil repellency than the low-refractive index material, creating a gradual transition that improves adhesion while maintaining the light transmission benefits of the low-refractive index material.
Solution Approach 2:
The oil repellency parameter is gradually changed across multiple layers rather than having a sudden jump. The transparent layer has intermediate oil repellency between the substrate and the low-refractive index material, creating a gradient that improves adhesion while preserving optical properties.
2Reliability
If the transparent layer has high oil repellency to improve adhesion, then material bonding is enhanced, but light scattering increases and brightness uniformity deteriorates
Solution Approach 1:
The transparent layer is positioned specifically at the interface between the substrate and low-refractive index material, providing localized adhesion enhancement only where needed for bonding, while the low-refractive index material maintains its optical properties in the light transmission region.
Solution Approach 2:
The transparent layer with intermediate oil repellency acts as a mediator that provides sufficient adhesion for the low-refractive index material while having lower oil repellency than the material itself, preventing excessive light scattering and maintaining brightness uniformity.
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 configuration ensures uniform brightness and improves display quality by suppressing non-uniformity and enhancing light utilization efficiency, thereby maintaining reliability.
Implementation Method 1
forming a low-refractive index layer to which the transparent layer is exposed, by patterning the low-refractive index material thus placed. The low-refractive index layer has a refractive index lower than that of the transparent substrate
Implementation Method 2
The transparent layer has an oil repellency higher than that of the first main surface with respect to the low-refractive index layer
Data Source
AI summary
According to one embodiment, a method of manufacturing a display device includes placing a transparent substrate having a first main surface, placing a transparent material above the first main surface, forming a transparent layer, in which at least a part of the first main surface is exposed, by patterning the transparent material thus placed, placing a low-refractive-index material on the first main surface and the transparent layer, and forming a low-refractive index layer to which the transparent layer is exposed, by patterning the low-refractive index material thus placed. The transparent layer has an oil repellency higher than that of the first main surface with respect to the low-refractive index layer.