Infrared Reflective Transparent Sheet for Direct Handwriting Input
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Solution Overview
Problem
Existing input devices require dedicated paper and separate display devices for real-time conversion of handwritten data, limiting their usability for intuitive and interactive operations, especially in mobile settings, and lack a transparent sheet that can provide broad read angles and excellent read performance.
Innovation Solution
An infrared ray reflection pattern-printed transparent sheet with a liquid crystal material having a cholesteric structure is used, which is printed on a transparent substrate, allowing for direct handwriting input on a display device with broad read angles and low production costs, enabling mass production and efficient data input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transparent sheet with infrared ray reflective patterns is used for direct handwriting input on display devices, then the read angle is broadened and read performance is improved, but the manufacturing complexity and material selection difficulty increase
Solution Approach 1:
The patent applies parameter changes by controlling the helical pitch of the cholesteric liquid crystal to specifically reflect infrared rays while maintaining transparency in the visible range. By adjusting the helical pitch parameter, the sheet achieves broad read angles for infrared detection without compromising visible transparency, resolving the contradiction between improved read performance and manufacturing complexity
Solution Approach 2:
The patent uses composite materials by combining cholesteric liquid crystal with UV curable resins to create a transparent sheet that simultaneously provides infrared reflection and visible transparency. This composite approach enables the sheet to function as both a display-protective layer and an infrared detection medium, improving ease of operation without excessive manufacturing complexity
2Loss of information
If dedicated paper with infrared absorbing dot patterns is used for handwriting input, then position information can be provided, but the paper becomes a consumable good requiring constant storage and replacement
Solution Approach 1:
The patent reverses the disposable approach by creating a durable, reusable transparent sheet with infrared reflective patterns. Instead of using consumable paper that loses its infrared properties after writing, the transparent sheet can be used repeatedly without degradation, eliminating the need for constant replacement and storage of dedicated paper
Solution Approach 2:
The transparent sheet serves multiple functions: it protects the display screen, maintains visible transparency, provides infrared reflection for position detection, and enables reusable handwriting input. This multi-functionality eliminates the need for separate dedicated paper, reducing substance consumption while maintaining position information capability
3Area of stationary object
If a transparent sheet with printed patterns is used for direct input on display devices, then workspace requirements are reduced, but the production cost and manufacturing difficulty increase
Solution Approach 1:
The patent controls the helical pitch parameter of the cholesteric liquid crystal to achieve infrared reflection at specific wavelengths while maintaining visible transparency. This precise parameter control allows the sheet to be manufactured using standard processes without requiring expensive specialized materials or complex multi-step manufacturing, reducing production costs while minimizing workspace requirements
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 allows for lightweight, cost-effective, and mass-producible transparent sheets that enable direct handwriting input on display devices with broad read angles, reducing workspace requirements and enhancing read performance, making it suitable for various mobile and interactive applications.
Implementation Method 1
an infrared ray reflection material which is a liquid crystal material having a wavelength selection reflectivity to a wavelength in an infrared region and assuming a fixed cholesteric structure
Implementation Method 2
a liquid crystal material having a wavelength selection reflectivity to a wavelength in an infrared region and assuming a fixed cholesteric structure
Data Source
AI summary
An infrared ray reflection pattern-printed transparent sheet is provided which can be applied to a data input system of a type of handwriting directly on a screen of a display device and provides a coordinate detect means and which is lightweight, low in a cost, readily increased in an area, possible in mass production and excellent in a read performance. It is an infrared ray reflection pattern-printed transparent sheet in which infrared ray reflective transparent patterns are printed on a surface of a transparent substrate and which is disposed oppositely to a front face of a display device. A cross section obtained by cutting the infrared ray reflective transparent patterns printed on the above transparent substrate in a face orthogonal to the above transparent substrate is formed so that it assumes a multilayer structure comprising a fixed repeating cycle when observed under a scanning electron microscope.