Cholesteric Liquid Crystal Display with Solar Cell Integration
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Solution Overview
Problem
Cholesteric liquid crystal displays are limited by the need for external electrical energy to switch between stable states, and conventional black absorbing layers can affect image quality due to reflectivity issues.
Innovation Solution
A cholesteric liquid crystal display device using a solar cell as a black material to absorb incident light and provide self-sustaining power, combined with a shielding layer to reduce reflectivity from metal wiring patterns, replacing conventional black absorbing layers and ensuring image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional black absorbing layer is used, then the display can absorb incident light, but the image quality deteriorates due to reflectivity issues
Solution Approach 1:
The patent combines the black absorbing layer and metal wiring pattern layer into a single integrated layer, where the metal wiring pattern is formed within the black material matrix. This merging eliminates the need for a separate shielding layer, reduces reflectivity by ensuring the metal pattern is embedded rather than exposed, and maintains good light absorption properties while improving image quality.
2Ease of operation
If external electrical energy is applied to switch between stable states, then the display can change states, but the device complexity and energy consumption increase
Solution Approach 1:
The patent utilizes the photovoltaic effect to enable the display to generate its own electrical energy from incident light. The black absorbing layer is designed with photovoltaic properties, allowing it to convert light energy into electrical energy that can be used to switch between the two stable states of the liquid crystal molecules. This self-service mechanism eliminates or reduces the need for external electrical energy sources.
3Manufacturing precision
If a shielding layer is added to reduce reflectivity, then image quality improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the shielding function into the black absorbing layer by embedding the metal wiring pattern within the black material. This eliminates the need for a separate shielding layer, reducing the total number of layers in the device structure while maintaining the reflectivity reduction function. The integrated approach simplifies manufacturing processes and reduces device complexity.
Solution Approach 2:
The black absorbing layer is designed to perform multiple functions simultaneously: light absorption, photovoltaic energy generation, and reflectivity reduction through embedded metal wiring pattern. This multi-functionality eliminates the need for separate dedicated layers for each function, reducing overall device complexity while maintaining or improving performance.
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 the display to operate with self-sustaining power and improved image quality by reducing light reflectivity from metal wiring patterns, while also simplifying the manufacturing process and reducing production costs.
Implementation Method 1
utilizing a black material of a solar cell to replace conventionally black absorbing layer to absorb incident light and display image by self-sustaining power
Implementation Method 2
the shielding layer is disposed between the first substrate and the first electrode layer and corresponds to and over the metal wiring pattern layer so as to lessen the reflectivity of the incident light with respect to the metal wiring pattern layer
Implementation Method 3
The cholesteric liquid crystal molecules have two stable states such as focal conic state and planar state, and their molecular orientation will be maintained without external electrical energy
Data Source
AI summary
A cholesteric liquid crystal display device includes a solar cell, a first substrate, a shielding layer, a first electrode layer, a cholesteric liquid crystal layer, a second electrode layer and a second substrate stacked sequentially from bottom to top. The solar cell includes a metal wiring pattern layer. The shielding layer corresponds to the upper side of the metal wiring pattern layer, and is used to reduce the reflection of light from the metal circuit pattern layer. In this way, the cholesteric liquid crystal display device replaces the traditional black absorbing layer with the black material of the solar cell, which can not only absorb light, but also display the image with self-sustaining power. The cholesteric liquid crystal display device shields the arrangement of the metal wiring pattern layer through the shielding layer, which can ensure the image quality of the display panel.