Patterned Ink Cholesteric Liquid Crystal Display for Multicolor Images
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Solution Overview
Problem
Conventional flexible cholesteric liquid crystal displays typically produce homogenous images due to a fixed, opaque light absorbing layer, limiting their ability to create complex patterns and multicolor reflections.
Innovation Solution
The display incorporates a patterned ink design on one or more substrates or interlayers, allowing for color mixing between the cholesteric liquid crystal layers and ink layers to produce multicolor, patterned images, with the patterned layer being either opaque or semitransparent, and electronic circuitry controlling the display's states for writing and erasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed opaque light absorbing layer is used, then uniform display with homogenous image is achieved, but ability to create complex patterns and multicolor reflections is limited
Solution Approach 1:
The display is divided into multiple independently controllable liquid crystal layers, each capable of producing different colors. This segmentation allows complex patterns and multicolor reflections to be created by controlling individual layers without requiring a completely complex monolithic structure.
Solution Approach 2:
The display combines multiple liquid crystal layers with different color properties and transparent substrates to create a composite display system. This composite structure enables multicolor reflections and complex patterns while maintaining the flexibility and simplicity inherent in each individual layer.
2Adaptability or versatility
If multiple liquid crystal layers are used for multicolor display, then image appeal and color variety are enhanced, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into separate steps for depositing each liquid crystal layer and transparent substrate, allowing each layer to be optimized and manufactured independently before final assembly. This reduces the complexity of manufacturing multicolor displays compared to creating a single integrated layer.
Solution Approach 2:
The transparent substrates and liquid crystal layers are designed to serve multiple functions - providing structural support, enabling color selection, and facilitating manufacturing. These universal components can be used across different display configurations, simplifying the overall manufacturing process.
3Adaptability or versatility
If patterned ink design is added to substrates or interlayers, then complex multicolor images are enabled, but device structure becomes more complex
Solution Approach 1:
Instead of requiring complex patterns throughout the entire display structure, the patent applies patterned ink designs only to specific substrates or interlayers where needed. This localized approach enables complex multicolor images while keeping the overall device structure relatively simple.
Solution Approach 2:
The patterned ink design acts as an intermediary element between the liquid crystal layers and the final image output. This intermediary layer simplifies the overall structure by providing the necessary patterning function without requiring complex modifications to the liquid crystal layers themselves.
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 enables the creation of complex, visually appealing multicolor images with enhanced image appeal, allowing for more dynamic and customizable display outputs without significant loss in contrast or brightness.
Implementation Method 1
The ChLC material is a natural reflector since its inherent chiral structure leads to a Bragg-type reflection of the incident light
Implementation Method 2
The Reflex display technology, based on cholesteric liquid crystals (ChLC), offers reflective, flexible, full-color, bistable displays
Data Source
AI summary
An electronic display includes electrically conductive layers. At least one active layer is disposed between adjacent electrically conductive layers. The active layer includes cholesteric liquid crystal material. The display includes a front transparent substrate behind which the electrically conductive layers are disposed. A back component is disposed at a back of the display below the active layer. At least one patterned layer is disposed at at least one of the following locations: on, in or near the front substrate and as an interlayer between the front substrate and the back component. The patterned layer is opaque or semitransparent. Electronic circuitry applies a voltage to the conductive layers that enables at least one of erasing or writing of the active layer. The active layer and the patterned layer cooperate to produce an image on the display.