Cholesteric Liquid Crystal Display Merging Layers for Cost Reduction
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Solution Overview
Problem
Conventional color cholesteric liquid crystal display devices face issues with high production costs, complex structures, and deteriorating image contrast due to the need for multiple cholesteric liquid crystal layers and additional light sources, which complicate the input and display processes.
Innovation Solution
A color cholesteric liquid crystal display device utilizing a single-layer or multi-layer panel with cholesteric liquid crystal molecules that change orientation under pressure and voltage, allowing for bi-stable states and dual-mode functionality through capacitance detection and specific voltage waveforms, simplifying the structure and fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a stacked structure of three different single-color cholesteric liquid crystal layers is used, then color display capability is improved, but device complexity and production cost increase
Solution Approach 1:
The patent combines three separate single-color cholesteric liquid crystal layers into a single integrated color cholesteric liquid crystal layer. This merging approach maintains the color display functionality while simplifying the overall device structure, reducing the number of components, and lowering production costs associated with assembling multiple layers.
Solution Approach 2:
The color cholesteric liquid crystal layer serves multiple functions simultaneously: it provides color display, acts as the display medium for both writing and display modes, and eliminates the need for separate color filtering layers. This multi-functionality reduces device complexity while maintaining color display capability.
2Ease of operation
If additional light sources and light detective layers are added, then input functionality is improved, but device complexity and production cost increase
Solution Approach 1:
The cholesteric liquid crystal layer serves both as the display medium and the input sensing medium. The same layer that displays information also detects the writing input through capacitance changes, eliminating the need for separate light sources and light detective layers. This self-service approach simplifies the device structure while maintaining full input functionality.
Solution Approach 2:
The cholesteric liquid crystal layer performs multiple roles: display, color filtering, and input detection. By making the display layer multi-functional, the patent eliminates the need for additional dedicated input components, thereby reducing device complexity and production costs.
3Ease of operation
If a touch control panel is placed in front of the LCD panel, then input capability is improved, but image contrast ratio deteriorates due to light reflection
Solution Approach 1:
The patent merges the touch control panel with the LCD panel into a single integrated structure. The touch control layer is formed on the same substrate as the cholesteric liquid crystal layer, eliminating the need for a separate front-placed touch panel that would cause light reflection and contrast deterioration.
Solution Approach 2:
The patent uses capacitance change as an intermediary mechanism to detect touch input without requiring a separate optical path. The touch control electrodes detect input through electrical capacitance changes in the liquid crystal layer itself, avoiding the need for additional light sources or reflective optical components that would degrade image contrast.
4Adaptability or versatility
If multiple independent panel structures are used, then input and display functions are achieved, but fabrication process complexity increases
Solution Approach 1:
The patent combines the touch control panel and LCD panel into a single integrated panel structure fabricated in one process. The touch control electrodes and cholesteric liquid crystal layer are formed together on the same substrate, eliminating the need for separate fabrication processes and assembly steps for multiple independent panels.
Solution Approach 2:
The integrated panel structure performs both input and display functions through a unified design. The same cholesteric liquid crystal layer and electrode structure enable both touch input detection and visual display, simplifying the fabrication process while maintaining full functionality.
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 cost-effective, simpler structure for color cholesteric liquid crystal display devices that can display and input data images efficiently, reducing operational complexity and production costs while maintaining high image quality.
Implementation Method 1
When the cholesteric liquid crystal is not applied with voltage, the cholesteric liquid crystal molecules are oriented in a focal conic state... When pressure is exerted on the cholesteric liquid crystal, the cholesteric liquid crystal molecules are oriented in a planar state
Implementation Method 2
If a color cholesteric liquid crystal display device is biased by a predetermined voltage, the cholesteric liquid crystal material will not transform from the F-state to the P-state under pressure exertion
Implementation Method 3
a capacitance detector respectively detecting displaying status of each of the plurality of color pixels which is stored in a memory unit
Data Source
AI summary
Color cholesteric liquid crystal display devices and driving methods thereof are provided. A color cholesteric liquid crystal display device includes a color cholesteric liquid crystal display panel with a plurality of sub-pixels. A driving module exerts a first voltage on a portion of sub-pixels of the color cholesteric liquid crystal display panel to hold displaying states of the biased sub-pixels. An input element exerts pressure on the color cholesteric liquid crystal display panel to change displaying states of the unbiased sub-pixels.