Cholesteric Liquid Crystal Stylus with Integrated Erasing Electronics
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Solution Overview
Problem
Existing cholesteric liquid crystal writing devices require a separate device for erasing, which is inconvenient as they need to be picked up and moved to an erasing device for electrical contact, unlike traditional pencils that can write and erase with opposite ends.
Innovation Solution
A cholesteric liquid crystal writing device and stylus where the erasing electronics are integrated into the stylus, allowing it to detect electrical contact and apply suitable voltage pulses to erase the device, enabling the stylus to both write and erase like a traditional pencil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate erasing device is used for cholesteric liquid crystal writing devices, then the erasing function is provided, but the device complexity increases and user convenience deteriorates
Solution Approach 1:
The patent combines the writing stylus and erasing device into a single integrated tool. The stylus contains both a writing tip for creating images and an erasing tip for removing them, allowing users to perform both writing and erasing operations with one device rather than requiring separate tools.
Solution Approach 2:
The stylus is designed to perform multiple functions: it can write on the liquid crystal display using pressure-sensitive tips and erase images using an erasing tip that applies voltage pulses. This multi-functional design eliminates the need for separate erasing devices and improves user convenience.
2Productivity
If erasing electronics are integrated into the stylus, then the erasing operation becomes simpler and faster, but the stylus structure becomes more complex
Solution Approach 1:
The erasing electronics are pre-integrated into the stylus body, including voltage generation circuitry and power sources. When the erasing tip makes contact with the display, the erasing operation can immediately begin without requiring external devices or setup, enabling quick and efficient image removal.
Solution Approach 2:
The stylus contains its own power source and control electronics, allowing it to independently generate the voltage pulses needed for erasing without requiring connection to external power or control systems. This self-contained design enables rapid erasing operations.
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 integration allows for easy and quick erasure of images by simply turning the stylus over and making contact, bringing the functionality closer to traditional pencil-on-paper writing, enhancing user convenience.
Implementation Method 1
the slight pressure of a pointed stylus or the fingernail can be used to write or trace an image on the surface of the writing device... The liquid crystal is sandwiched between two substrates... Within the cell gap is a bistable cholesteric liquid crystal layer which can exhibit two textures, an essentially transparent (focal conic) texture and a color reflective (planar) texture
Implementation Method 2
Erasure is accomplished with the eWriter cleared by applying voltage pulses to an upper transparent electrically conductive layer and a lower optionally transparent electrically conducting layer on the inner surfaces of the substrates that drives the cholesteric liquid crystal from its color reflective state back to its focal conic substantially transparent state
Data Source
AI summary
A liquid crystal writing device is erased by a stylus. The liquid crystal writing device includes a liquid crystal layer including cholesteric liquid crystal material. A user applies pressure to a flexible substrate that changes reflectivity of the cholesteric liquid crystal material to form images on the liquid crystal writing device. The liquid crystal layer is disposed between electrically conductive layers. Writing device terminals are electrically conductive and connected to the electrically conductive layers. The stylus includes stylus electronics adapted to apply an erase voltage or erase voltage waveform to the writing device terminals.