Cholesteric Liquid Crystal Display Wall Structure for Bending Stability
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Solution Overview
Problem
Liquid crystal display elements using cholesteric liquid crystals face challenges in maintaining display stability when bent or pressed, as the fluidity of the cholesteric liquid crystal leads to changes in the display state, and existing solutions either compromise on cell gap uniformity or reliability.
Innovation Solution
The implementation of a wall structure surrounding pixel regions with adhesive properties and external liquid crystal channels to limit movement and prevent changes in the display state, allowing for flexible and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a liquid crystal display element utilizes cholesteric liquid crystal to achieve color display and semi-permanent display retention, then brightness and memory characteristics are improved, but display stability when bent or pressed deteriorates due to fluidity of the liquid crystal
Solution Approach 1:
The patent divides the liquid crystal display into separate pixel regions surrounded by wall structures. Each pixel region is independently enclosed, preventing liquid crystal flow between pixels when the display is bent or pressed. This segmentation maintains display stability while preserving the brightness and memory characteristics of cholesteric liquid crystal displays.
Solution Approach 2:
The wall structure acts as an intermediary barrier between pixel regions. This intermediate structure limits the movement of cholesteric liquid crystal to specific channels while maintaining the overall display functionality. The wall structure enables the display to withstand bending and pressing without compromising pixel-level performance.
2Manufacturing precision
If adhesive pillars are used to maintain uniform cell gap, then manufacturing precision is improved, but flexibility and reliability under bending deteriorates
Solution Approach 1:
The patent employs a wall structure made of flexible material that can bend with the display without compromising cell gap uniformity. This flexible enclosure maintains both manufacturing precision and flexibility, allowing the display to be bent or pressed while keeping pixel regions stable and maintaining uniform spacing throughout the liquid crystal layer.
3Reliability
If complete enclosure of pixel regions is implemented to prevent liquid crystal movement, then display stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the display into pixel regions enclosed by wall structures, providing complete enclosure to prevent liquid crystal movement. This segmentation approach achieves display stability while maintaining manageable structural complexity through systematic repetition of the wall structure pattern across the display surface.
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 effectively prevents changes in the display state due to bending, pressing, or temperature changes, enhancing the flexibility and durability of the liquid crystal display elements while maintaining high display quality.
Implementation Method 1
A liquid crystal display element utilizing a liquid crystal composition which forms a cholestetic phase (which is called as a cholesteric liquid crystal or a chiral nematic liquid crystal and which will be hereinafter referred to using the term 'cholesteric liquid crystal')
Implementation Method 2
In the planar state, light rays having predetermined wavelengths are selectively reflected
Implementation Method 3
In the focal conic state, the property of selectively reflecting light rays is lost, and most of incident rays of light are transmitted
Implementation Method 4
a wall structure which is formed to surround pixel region and which is in contact with both of the pair of substrates
Implementation Method 5
a wall structure which is formed to surround pixel region and which is in contact with both of the pair of substrates
Data Source
AI summary
A display element comprises: a pair of substrates disposed opposite to each other; a liquid crystal enclosed between the pair of substrates; a wall structure which is formed to surround a pixel region and which is in contact with both of the pair of substrates; and an opening section which is an opening provided in a part of the wall structure to allow the liquid crustal to flow out of the pixel region.