Cholesteric Liquid Crystal Display With Stray-Light-Absorbing Substrates
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Solution Overview
Problem
Conventional cholesteric liquid crystal display devices suffer from poor display quality due to excessive reflection of stray light, which is not effectively managed by optical color adhesives, and have complex structures requiring multiple adherence processes, leading to high thickness, weight, and production costs.
Innovation Solution
A cholesteric liquid crystal display device with three multilayer structures, each comprising a color substrate, lower and upper electrode layers, and pixel layers, where the color substrates absorb or filter stray light, reducing reflection and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If optical color adhesives are used to remove stray light in conventional cholesteric liquid crystal display devices, then some stray light can be removed, but most surrounding light source is reflected by substrates before entering the adhesives, making display quality poor
Solution Approach 1:
The patent applies preliminary action by incorporating a light-absorbing layer at the lower substrate before the surrounding light source can be reflected by internal structures. This pre-interception of light prevents the reflection issue from occurring in the first place, rather than attempting to remove reflected light afterward through adhesive layers.
Solution Approach 2:
The patent extracts the light-absorbing function from the adhesive layer concept and creates a dedicated light-absorbing layer at the lower substrate. This separates the light absorption function from the substrate structure, allowing optimal placement and material selection for stray light management without compromising display quality.
2Device complexity
If multiple display modules are stacked and adhered using optical color adhesives, then the display device can be formed, but the complex stacked structure requires repeated adherence processes, leading to high thickness, weight and production costs
Solution Approach 1:
The patent merges the light-absorbing function with the lower substrate structure by forming a light-absorbing layer directly on the lower substrate. This integration eliminates the need for separate adhesive layers with light-absorbing properties, simplifying the overall structure and reducing the number of adherence processes required.
Solution Approach 2:
The lower substrate is given multiple functions: it serves as both the structural base and the light-absorbing element through the integrated light-absorbing layer. This multi-functionality reduces the need for additional components and adherence processes, thereby lowering production costs and simplifying manufacturing.
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
Improves image quality and optical contrast while reducing thickness, weight, and production costs by effectively absorbing or filtering stray light, thereby simplifying the stacked structure and adherence processes.
Implementation Method 1
The color substrate absorbs or filters a stray light from outside
Data Source
AI summary
A cholesteric liquid crystal display device includes three multilayer structures, which are stacked on each other. Each of the multilayer structures includes a color substrate, a lower electrode layer, a pixel layer, an upper electrode layer and an upper substrate. The color substrate absorbs or filters a stray light from outside.