Working principle of infrared touch screen of interactive electronic whiteboard
The working principle of the infrared touch screen of the interactive electronic whiteboard is that the infrared receiving tube and the infrared emitting tube are covered around the touch screen. These infrared tubes are arranged on the surface of the touch screen in a one-to-one corresponding positional relationship, forming an optical network made of infrared light. , When an object (which can be a finger, a gloved hand, or any touching object) enters the infrared light network to block the infrared transmission and reception of a certain place, the strength of the infrared light received by the receiving infrared tube in the horizontal and vertical directions at this point It will change, and the device will know where the touch was made by knowing the change in infrared reception.
Infrared touch screen can interpolate data at various points through hardware design and software programming, and can achieve a resolution of 4096 × 4096; due to the working principle of infrared touch screen itself, it can be used without pressure (refer to touch The pressure applied by the body to the touch screen itself, so it can work without glass. At the same moment when the infrared touch screen is working, there is only one pair of infrared pair tubes, that is, a transmitting tube and a receiving tube (including an infrared receiving head) corresponding to the physical position, and the data is processed by the circuit. Manage high-frequency data collection to achieve rapid response.
The main disadvantage of infrared touch screens is that they rely on infrared light to work and are more sensitive to lighting environment factors, and will misjudge or even crash when the lighting changes greatly. After the introduction of the second-generation anti-light interference infrared touch screen in China, the second-generation infrared touch screen has overcome this weakness.
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