Single-Layer Cholesteric Liquid Crystal Display with Varying Pitch Regions
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Solution Overview
Problem
Existing cholesteric liquid crystal displays require multiple stacked layers to achieve full color, which increases costs and limits practical use due to complexity and energy consumption.
Innovation Solution
A single-layered cholesteric liquid display is achieved by doping an optically active chiral agent into a nematic liquid crystal to create a cholesteric liquid crystal capsule, coating it on a substrate, exposing it to light to vary pitches, and attaching an electrode substrate to enable reflection of different colors in distinct regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple stacked layers of cholesteric liquid crystal are used to achieve full color display, then color display capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent divides the single cholesteric liquid crystal layer into multiple regions with different pitches, where each region reflects a different color wavelength. This segmentation allows full color display without stacking multiple layers, as each segment handles a specific color portion independently within the same layer structure.
Solution Approach 2:
Different regions of the cholesteric liquid crystal layer are given different local properties through varying pitch values. The pitch is manipulated locally in different areas to control which wavelengths are reflected, enabling color differentiation without requiring separate layers for each color.
2Adaptability or versatility
If multiple stacked layers of cholesteric liquid crystal are used to achieve full color display, then color display capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the functions of multiple color layers into a single cholesteric liquid crystal layer by creating different pitch regions within it. This consolidation reduces the number of materials, layers, and manufacturing steps required, thereby lowering production costs while maintaining full color display capability.
Solution Approach 2:
A single cholesteric liquid crystal layer is designed to perform multiple color reflection functions simultaneously through its varying pitch structure. This multi-functional design eliminates the need for separate dedicated layers for red, green, and blue color reflection, simplifying manufacturing and reducing costs.
3Adaptability or versatility
If multiple stacked layers of cholesteric liquid crystal are used to achieve full color display, then color display capability is improved, but energy consumption increases
Solution Approach 1:
By merging multiple color reflection functions into a single layer with varying pitches, the patent reduces the total number of components that require energy to operate. Fewer layers mean fewer transitions and less energy required to maintain the display state, while still achieving full color output.
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
Enables low-cost, simple, and mass-producible single-layer full color display with reduced energy consumption and complexity compared to multi-layered systems.
Implementation Method 1
CLC has drawn interest from many researchers due to its unique characteristics derived from its structure. The most important characteristics of CLC include its selective reflection property: circularly polarized light that shares the same optical direction as the helical axis of the CLC is reflected, while other light penetrates.
Implementation Method 2
For normal incoming light, the equation for the wavelength at the maximum selective reflectance is λ0=n•p, wherein n is an average reflection coefficiency, and p is a pitch. Although is an inherent property of a liquid crystal molecule, p varies along with temperature, electric field strength, magnetic field strength and the like. Therefore, it is possible to select the color of the reflected light by adjusting p.
Implementation Method 3
S1, doping an optically active chiral doping agent to a nematic liquid crystal to generate a cholesteric liquid crystal capsule
Implementation Method 4
S3, exposing the cholesteric liquid crystal layer to light so that the same layer of cholesteric liquid crystal has different pitches in different regions
Data Source
AI summary
Embodiments of the invention comprise a cholesteric liquid display and a method for preparing the same. The cholesteric liquid display comprises a first substrate; an electrode substrate opposite to the first substrate; and a cholesteric liquid crystal layer between the first substrate and the electrode substrate, wherein the cholesteric liquid crystal layer comprises at least one layer of cholesteric liquid crystal, and the same layer of cholesteric liquid crystal has different pitches in different regions so as to be capable of reflecting light of different colors, respectively.