Liquid Crystal Layer Concavo-Convex Shape Rainbow Stain Reduction
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Solution Overview
Problem
Display devices suffer from visibility issues due to rainbow stains caused by light interference, which existing technologies have not adequately addressed.
Innovation Solution
The implementation of a display device structure that includes a liquid crystal layer, a scattering layer, or a low-reflection layer between substrates to reduce coherence and visibility of rainbow stains, with the liquid crystal layer having a concavo-convex shape, the scattering layer comprising a base resin and scattering particles, and the low-reflection layer having a multi-layer structure with varying refractive indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional display device structure is used, then the device is simple and easy to manufacture, but rainbow stains are visible due to light interference
Solution Approach 1:
The patent introduces an intermediary layer (scattering layer or liquid crystal layer) between the first and second substrates to mediate the light path. This intermediary layer randomizes the optical path of light passing through the display device, thereby reducing coherence and minimizing rainbow stain visibility without fundamentally redesigning the entire device structure
Solution Approach 2:
The patent changes the optical parameters of the light path by introducing layers with specific optical properties (scattering particles, liquid crystal molecules with specific alignment). These parameter changes affect how light propagates through the device, reducing interference patterns that cause rainbow stains
2Object-affected harmful factors
If a scattering layer with particles is added, then rainbow stain visibility is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The scattering layer utilizes a porous or particulate structure where scattering particles are dispersed within a base resin. This structure naturally provides light scattering functionality while the particulate nature allows for tolerance in particle placement, reducing the stringency of manufacturing precision requirements compared to continuous film structures
Solution Approach 2:
The scattering layer is formed as a composite material combining a base resin with dispersed scattering particles. This composite structure provides both mechanical integrity and optical scattering functionality, with the particle dispersion approach offering manufacturing flexibility
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 reduces the visibility of rainbow stains in the display area by randomizing the optical path of light, thereby enhancing display quality.
Implementation Method 1
the plurality of liquid crystal molecules may be vertically aligned with respect to the one surface of the second substrate
Implementation Method 2
the scattering layer may include a base resin and a plurality of scattering particles dispersed in the base resin
Implementation Method 3
the low-reflection layer may have a multi-layer structure including two or three sub-layers, and the sub-layers of the low-reflection layer may have different refractive indices from each other
Data Source
AI summary
A display device includes: a first substrate, a display portion disposed on the first substrate, a second substrate disposed on the display portion, and a liquid crystal layer contacting one surface of the second substrate, including a plurality of liquid crystal molecules, where a surface of the liquid crystal layer facing the first substrate has a concavo-convex shape.