Flexible Cholesteric Liquid Crystal Display with Low Voltage Switching
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Solution Overview
Problem
Current cholesteric liquid crystal display devices face limitations due to high driving voltage requirements, complex manufacturing processes, and lack of flexibility, making them unsuitable for applications like electronic paper that require low power consumption, ease of use, and reusability.
Innovation Solution
A liquid crystal display device with a configuration of flexible conductive layers, encapsulated cholesteric liquid crystals in microcapsules, and a light absorbing layer, allowing for low voltage switching and thermal printing capabilities, using a transparent substrate and conductive coatings like ITO or carbon nanotubes, and adhesives for stability and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cholesteric liquid crystal display devices use conventional glass substrates and structures, then they achieve stable display performance, but they lack flexibility and require complex manufacturing processes with high driving voltage
Solution Approach 1:
The patent replaces conventional glass substrates with flexible plastic substrates, enabling the display device to be bent and conform to various surfaces. The liquid crystal layer is encapsulated in microcapsules that can be dispersed in adhesive, creating a flexible structure that maintains display functionality while achieving paper-like flexibility for electronic paper applications
Solution Approach 2:
The patent extracts the liquid crystal from a rigid substrate-bound structure and encapsulates it in free-standing microcapsules. This extraction allows the liquid crystal to be dispersed in adhesive without requiring complex alignment layers and substrate structures, dramatically simplifying the manufacturing process while maintaining display performance
2Reliability
If conventional cholesteric liquid crystal display structures are used, then they provide stable display characteristics, but they require high driving voltage and complex manufacturing
Solution Approach 1:
The patent modifies the pitch of the cholesteric liquid crystal to match the wavelength of visible light, enabling the material to reflect light without requiring high driving voltages. This parameter change allows the display to operate at low voltages while maintaining stable bistable characteristics for reliable display performance
3Duration of action of moving object
If cholesteric liquid crystals are used for low power consumption, then battery lifetime is extended, but driving voltage requirements and manufacturing complexity remain high
Solution Approach 1:
The microcapsule structure allows the liquid crystal to maintain its bistable states without requiring continuous power supply or complex driving circuits. The encapsulated liquid crystal automatically maintains its display state, enabling simple driving operations and extending battery lifetime through passive power maintenance
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 solution enables a flexible, low-power, and reusable display with a simple driving mode, capable of thermal printing and high contrast ratios, improving upon conventional devices by reducing voltage requirements and simplifying manufacturing, while maintaining stability and flexibility.
Implementation Method 1
they can be tailored to Bragg reflect light at a specific wavelength and bandwidth
Implementation Method 2
The reflected light is circularly polarized with the same handedness as the helical structure of the liquid crystal
Implementation Method 3
The cholesteric material can be electrically switched to either one of two stable textures, planar or focal conic, or to a homeotropically aligned state if a suitably high electric field is maintained
Implementation Method 4
capable of thermal printing and high contrast ratios
Data Source
Figure 1~3
Figure 4
AI summary
A liquid crystal display device and uses thereof are provided. The liquid crystal display device comprises at least two flexible conductive layers and an adhesive layer containing cholesteric liquid crystals and sandwiched between the at least two flexible conductive layers, at least one of the at least two flexible conductive layers is a transparent flexible conductive layer, and when the at least two flexible conductive layers both are transparent flexible conductive layers, a light absorbing layer (4) is disposed at a side of any of the flexible conductive layers near the adhesive layer, when only one of the flexible conductive layers is a transparent flexible conductive layer, the light absorbing layer (4) is disposed at a side of the nontransparent flexible conductive layer near the adhesive layer. The liquid crystal display device provided in the present invention has advantages of low driving voltage, flexible display, reusability and so forth, and is suitable for the field of electronic paper.