Remote Touch Detection via Air Refraction
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Solution Overview
Problem
Conventional infrared touch screens require users to be close to the device to perform a touch operation, as they rely on blocking infrared signals, making remote touch operations impossible.
Innovation Solution
A touch display system that emits non-visible light to heat the air around a contact point on the touch screen, allowing a touch detection module to determine the position of light refraction from a second non-visible light passing through the heated air, enabling remote touch operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional infrared touch technology is used to detect touch operations by blocking infrared signals, then the touch detection can be realized, but the user must be sufficiently close to the device to perform a touch operation, making remote touch operation impossible
Solution Approach 1:
The patent introduces air as an intermediary medium between the infrared transmitter and receiver. By heating the air around the contact point with infrared radiation, the air density changes and causes light refraction, which indirectly indicates the touch position. This intermediary mechanism enables remote touch operation while maintaining detection accuracy.
Solution Approach 2:
The patent changes the detection parameter from direct infrared signal blocking to light refraction through heated air. By detecting the refraction of visible light through the temperature-modified air medium, the system can identify touch positions remotely with high accuracy, resolving the contradiction between remote operation capability and detection reliability.
2Ease of operation
If infrared transmitters and receivers are mounted on the touch screen frame to form an infrared detection network, then touch operations can be detected, but the method only works when the user is close to the device
Solution Approach 1:
The patent extracts the core detection function from the complex infrared detection network and simplifies it to detecting light refraction through heated air. This extraction allows the system to maintain touch detection capability while enabling remote operation and reducing the complexity of the detection network structure.
3Measurement precision
If a touch operation is realized by blocking the infrared signal at a contacting point, then the coordinate position can be obtained, but the method requires the user to be sufficiently close to the device
Solution Approach 1:
The patent replaces the mechanical proximity-based detection system with an optical field-based system. By using visible light refraction through heated air instead of direct infrared signal blocking, the system achieves the same measurement precision for contact point coordinates while eliminating the proximity requirement, allowing remote operation.
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
Enables remote touch operations by heating the air around the contact point with non-visible light, allowing for accurate determination of the contact point's coordinates through light refraction, thereby overcoming the proximity limitations of traditional infrared touch screens.
Implementation Method 1
The first non-visible light is able to heat up air around a contact point on the touch screen
Implementation Method 2
determining a position of a light refraction occurred as a second non-visible light is incident on the air heated by the first non-visible light
Data Source
AI summary
Touch display system and touch operation device are provided. An exemplary touch display system includes a touch operation device for emitting first non-visible light; and a touch display device including a touch screen and a touch detection module. The first non-visible light is able to heat up air around a contact point on the touch screen. The touch detection module is configured for determining a position of a light refraction occurred as a second non-visible light is incident on the air heated by the first non-visible light.