Double-Layer Cholesteric Liquid Crystal Display for Reduced Thickness
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Solution Overview
Problem
Current three-layer cholesteric liquid crystal displays are costly and complex to manufacture, especially for applications that do not require full color or high resolution, due to issues like mutual interference between layers and high operational costs.
Innovation Solution
A double-layer cholesteric liquid crystal display with three transparent substrates, two opposing electrode layers, two cholesteric liquid crystal layers with opposite optical rotary properties, and a first light-absorbing layer, which reduces manufacturing complexity and costs while enhancing display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a three-layer cholesteric liquid crystal display is used, then color display capability is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent extracts and removes the third cholesteric liquid crystal layer from the traditional three-layer structure, retaining only two layers. This simplification eliminates the mutual interference problem between the first and third layers while maintaining adequate color display capability for applications that do not require full-color presentation, such as electronic tags and simple signage.
Solution Approach 2:
The patent inverts the conventional approach by using two layers instead of three, and strategically positions the light-absorbing layer at the bottom rather than within the liquid crystal layers. This inverted structure eliminates the interference issue between outer layers and simplifies the manufacturing process.
2Adaptability or versatility
If a three-layer cholesteric liquid crystal display is used, then color display capability is improved, but production cost increases
Solution Approach 1:
By extracting the third layer from the three-layer structure, the patent reduces material costs (fewer liquid crystal layers, fewer substrates, fewer electrode layers) and manufacturing costs (simplified bonding and lamination processes, reduced OCA usage), while still achieving acceptable color display for non-full-color applications.
Solution Approach 2:
The patent adopts a simplified two-layer structure that uses fewer expensive materials and manufacturing steps, making it economically viable for applications where full-color capability is not required, thus providing a cost-effective solution for electronic tags and simple signage.
3Adaptability or versatility
If a three-layer cholesteric liquid crystal display is used, then color display capability is improved, but display performance deteriorates due to mutual interference
Solution Approach 1:
The patent removes the third cholesteric liquid crystal layer that causes mutual interference with the first layer. By retaining only two layers, the interference problem is eliminated, and the display performance in terms of contrast ratio, color saturation, and reflectivity is significantly improved.
Solution Approach 2:
The patent introduces a light-absorbing layer as an intermediary element positioned at the bottom of the structure. This layer absorbs stray light and prevents it from interfering with the display, thereby improving contrast and overall display performance without requiring a third cholesteric layer.
4Adaptability or versatility
If a three-layer cholesteric liquid crystal display is used, then color display capability is improved, but device thickness increases
Solution Approach 1:
The patent extracts the third layer from the three-layer structure, directly reducing the overall device thickness. The two-layer configuration requires fewer substrates, fewer liquid crystal layers, and fewer electrode layers, resulting in a thinner and lighter display device suitable for portable and space-constrained applications.
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
The double-layer design results in a thinner, lighter display with improved contrast and reflectivity, reducing production costs and simplifying the manufacturing process compared to traditional three-layer displays.
Implementation Method 1
When the cholesteric liquid crystal molecules are in the planar state, they reflect light of a specific wavelength. Conversely, when the cholesteric liquid crystal molecules are in the focal conic state, light is able to pass through liquid crystal molecules.
Implementation Method 2
cholesteric liquid crystal molecules have the characteristic of reflective single optical rotation
Implementation Method 3
the reflected light rays can interfere with each other, further causing light leakage
Data Source
AI summary
A double-layer cholesteric liquid crystal display and its manufacturing method are disclosed. The double-layer cholesteric liquid crystal display includes three transparent substrates, two opposing electrode layers, two cholesteric liquid crystal layers, and a first light-absorbing layer. Additionally, the double-layer cholesteric liquid crystal display incorporates two drive ICs and a second light-absorbing layer. The two drive ICs can be positioned either on the same side or on opposite sides within the non-display area of the double-layer cholesteric liquid crystal display. Furthermore, the first cholesteric liquid crystal layer exhibits a first color light, and the second cholesteric liquid crystal layer exhibits a second color light, where the colors are selected as contrasting colors. Additionally, the two cholesteric liquid crystal layers possess mutually opposite optical rotary properties. The invention is capable of producing a thinner, lighter double-layer cholesteric liquid crystal display that enhances contrast and reflectivity, thereby effectively improving the overall display performance.