IR UV Transparent Optical Films for Display Touch and Disinfection
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Solution Overview
Problem
Existing touch technologies for large area displays using infrared light sources and detectors become exponentially expensive due to the need for high-quality components for efficient signal propagation, and face challenges with efficient in-coupling and out-coupling of infrared light, ambient light interference, and surface contamination.
Innovation Solution
A display system that incorporates visible, ultraviolet, and infrared light emitting and detecting devices, along with a reflective polarizer and an optical film, allowing for the transmission of infrared light throughout the LCD and enabling touch functionality while also providing disinfection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If infrared light sources and detectors are used for touch functionality in large area displays, then touch functionality is achieved, but the system becomes exponentially expensive due to the need for high-quality components for efficient signal propagation
Solution Approach 1:
The patent replaces expensive high-quality infrared components with cheaper infrared-transparent optical films that have sufficient performance for the application. The optical films are less demanding in terms of quality requirements while still enabling effective infrared light transmission for touch functionality, thereby reducing overall system cost.
Solution Approach 2:
The patent changes the optical parameters of the display system by introducing optical films with specific infrared transmission characteristics. These films are designed to be transparent to infrared wavelengths while maintaining visible light display performance, allowing cost-effective implementation of infrared touch functionality.
2Measurement precision
If infrared light is used for touch functionality, then touch sensitivity is improved, but ambient light interference and surface contamination become significant challenges
Solution Approach 1:
The patent segments the optical system into distinct functional layers: the display panel for visible light, infrared-transparent optical films for infrared transmission, and specific positioning of infrared sources and detectors. This segmentation allows each component to be optimized for its specific wavelength range, reducing interference between visible and infrared functions.
Solution Approach 2:
The infrared-transparent optical films serve as intermediaries that selectively transmit infrared light while blocking or filtering visible ambient light. This intermediary layer protects the infrared detection system from ambient light interference while maintaining touch sensitivity.
3Measurement precision
If high-quality optical components are used for efficient infrared signal propagation, then touch accuracy is improved, but device complexity increases
Solution Approach 1:
The patent uses thin infrared-transparent optical films instead of complex rigid optical components. These flexible films are simpler in structure, easier to integrate into the display assembly, and sufficient for achieving the required infrared transmission and touch accuracy.
Solution Approach 2:
The patent replaces complex high-quality optical components with simpler, cheaper optical films that meet the minimum performance requirements for infrared transmission. This reduces both device complexity and manufacturing cost while maintaining adequate touch 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 proposed display system achieves efficient touch functionality and potential disinfection of displays using a cost-effective approach by allowing the transmission of infrared light and utilizing optical films that are transparent to ultraviolet and infrared light.
Implementation Method 1
the reflective polarizer has an optical transmission of greater than about 30% for the at least the second wavelength and for at least one of the first and second polarization states
Implementation Method 2
enabling the transmission of infrared light throughout the LCD
Implementation Method 3
The display panel is configured to receive the emitted first and second lights and form an image
Data Source
AI summary
A display system includes visible light emitting first devices configured to emit a first light having at least a first visible wavelength; ultraviolet light emitting second devices configured to emit a second light having at least a second ultraviolet wavelength; a display panel disposed on the first and second devices; and a reflective polarizer disposed between the display panel and the first and second devices, such that the reflective polarizer has, for the visible wavelength, an average optical reflectance of greater than about 50% when an incident light is polarized along an in-plane first direction and an average optical transmittance of greater than about 50% when the incident light is polarized along an in-plane orthogonal second direction; and an optical transmission of greater than about 30% for the at least the second wavelength and for at least one of the first and second polarization states.