Cholesteric Liquid Crystal Device with Partition Cavities
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Solution Overview
Problem
Conventional cholesteric liquid crystal displays require at least three colors of cholesteric liquid crystal materials to achieve full color image display, resulting in high material costs and lengthy fabrication times.
Innovation Solution
A cholesteric liquid crystal device utilizing a single cholesteric liquid crystal material in conjunction with cavities of different optical lengths to produce full color images, where the optical length is determined by the thickness of the cholesteric liquid crystal layer, allowing for the reflection of light of various wavelengths and achieving color display through optical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If three colors of cholesteric liquid crystal materials are used to achieve full color display, then color display capability is improved, but material cost increases
Solution Approach 1:
The patent changes the optical path length parameter of the single cholesteric liquid crystal layer by creating multiple cavities with different thicknesses (first cavity with first optical length, second cavity with second optical length, third cavity with third optical length). This allows a single material to reflect different wavelengths of light, achieving full color display without needing multiple colored materials.
Solution Approach 2:
The liquid crystal layer is segmented into multiple cavities with different optical paths. Each cavity reflects a specific color wavelength, and together they form a complete color display. This segmentation allows one material to perform the function of multiple materials.
2Productivity
If three colors of cholesteric liquid crystal materials are used to achieve full color display, then color display capability is improved, but fabrication time increases
Solution Approach 1:
By changing the optical path length parameter through cavity thickness variation, the patent enables a single cholesteric liquid crystal material to produce multiple colors. This eliminates the need for separate fabrication processes for different colored layers, significantly reducing fabrication time while maintaining full color display capability.
Solution Approach 2:
The patent merges the functions of three separate colored liquid crystal layers into a single layer with varying cavity thicknesses. This consolidation reduces the number of fabrication steps and materials needed, improving productivity while achieving the same color display result.
3Ease of manufacture
If a single cholesteric liquid crystal material is used with cavities of different optical lengths, then material cost and fabrication time are reduced, but display brightness and color purity must be maintained
Solution Approach 1:
The patent applies local quality by giving different optical path lengths to different regions (cavities) of the liquid crystal layer. Each cavity is locally optimized to reflect specific wavelengths with high purity, while the overall structure maintains good brightness through the cumulative effect of multiple cavities.
Solution Approach 2:
By precisely controlling the optical path length parameter of each cavity, the patent optimizes the reflection wavelength and intensity. This parameter optimization ensures that each cavity contributes maximally to its designated color, maintaining both brightness and color purity while using a single material.
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 approach reduces material costs and fabrication time while enhancing brightness and color purity by using a single cholesteric liquid crystal layer with cavities of varying optical lengths to produce a full color display, outperforming conventional methods by reflecting both left-handed and right-handed visible light.
Implementation Method 1
achieving color display through optical interference
Implementation Method 2
A first reflective layer is disposed over the first substrate and a second reflective layer is disposed over the second substrate, facing the first reflective layer
Implementation Method 3
reflecting both left-handed and right-handed visible light
Data Source
AI summary
A cholesteric liquid crystal device is provided. The cholesteric liquid crystal device includes a first substrate, a second substrate disposed opposite to the first substrate, a first reflective layer disposed over the first substrate, a second reflective layer disposed over the second substrate, facing the first reflective layer, and a partition structure disposed between the first and the second substrates, wherein a cavity is formed by the partition structure, the first reflective layer and the second reflective layer, and a cholesteric liquid crystal layer is filled in the cavity.