For everyone, the touch screen is nothing new. Especially in today's popular smartphones, touch screens have become the standard for mobile phones. The technical principles of the touch screen on the network abound, and will not be described here. Mr. Sun Jianguo, Director of R&D Department of Shenzhen Meiruifei Intelligent Technology Co., Ltd., introduced the smart kitchen TV as an example to introduce the practical application and excellence of touch technology in daily life.
At present, the most commonly used touch technologies are divided into three categories: resistive touch screens, capacitive touch screens, and infrared touch screens.
The first is to use a resistive touch screen to detect coordinates by touch pressure, which can only achieve single touch, which is common in bank ATMs.
The second is to use a capacitive touch screen to detect multi-touch by sensing the static electricity of the human body to detect coordinates. Capacitive touch technology provides a much clearer definition than the plastic film commonly used in resistive touch, and the light transmittance is much higher, so capacitive touch screens are much more expensive than resistive touch screens. At present, the smartphones that everyone uses are basically capacitive touch screens.
The third type is an infrared type touch screen, which is composed of a light emitting diode and a receiving diode (photodiode) arranged in a frame around the screen. Usually, the light emitting tube and the receiving tube are in one-to-one correspondence and arranged in opposite directions. In the absence of object blocking, the receiving tube can receive the infrared rays incident on the opposite tube. If any object is used to touch the screen, the light from the tube will be blocked, and the receiving tube will not receive the light. The IC determines the screen coordinates by detecting the position of the light-emitting tube and the receiving tube that block the light. This type of detection, which does not require pressure, does not require static electricity from the human body, so it is convenient to use. However, it cannot be used in places where the light is too strong, and it is easily interfered by strong light. Currently used on a computer-integrated machine with touch function.
Director Sun introduced that the kitchen smart TV produced by Meridian has a 10.1-inch high-resolution liquid crystal display, and the most mainstream capacitive touch screen. It is equipped with the 4-core ARM9 processor of AMLOGIC, and the TV image is clear and natural. The sound is sweet and beautiful. User-friendly UI interface, simple operation and powerful functions.
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