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Talking about touch screen technology and future trends

Source: KONWHAI TOUCHAuthor: nick Date: 2018-12-28 Click:

  •      Touch screen, also known as "touch screen" or "touch panel", is an inductive liquid crystal display device that can receive input signals such as contacts, when touched on the on-screen graphic button, on the screen The haptic feedback system can drive various connection devices according to a pre-programmed program, which can be used to replace the mechanical button panel and create a live-action audio and video effect through the liquid crystal display screen.
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  •      As the latest computer input device, the touch screen is the most simple, convenient and natural way of human-computer interaction. It gives multimedia a new look and is an attractive new multimedia interactive device.
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  •      Mainly used in public information inquiry, leadership office, industrial control, military command, electronic games, ordering songs, multimedia teaching, real estate pre-sales, etc.
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  •      So, what about touch screen technology and future trends?
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  • Talking about touch screen technology and future trends

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  •   Touch screen technology and future development:  
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  •      At present, according to the type of sensor, the touch screen is roughly classified into four types: infrared type, resistive type, surface acoustic wave type and capacitive touch screen.
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  • (1) Infrared touch screen
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  •      The infrared type touch screen is provided with a circuit board outer frame on the front side of the display, and the circuit board arranges an infrared emitting tube and an infrared receiving tube on four sides of the screen, and one-to-one correspondingly forms an infrared matrix which is horizontally and vertically crossed. When the user touches the screen, the finger blocks the two infrared rays passing through the position, so that the position of the touch point on the screen can be judged. Any touch object can change the infrared light on the contact to achieve touch screen operation. The infrared touch screen is immune to current, voltage and static interference and is suitable for certain harsh environmental conditions. Its main advantages are low price, easy installation, no need for a card or any other controller, and can be applied to computers of various grades.
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  • (2) Resistive touch screen
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  •      The main part of the resistive touch screen is a resistive film screen that fits perfectly with the surface of the display. Two layers of OTI transparent oxidized metal conductive layer are applied to the tempered glass surface. Controlled by pressure sensing. When the finger touches the screen. The two conductive layers have contact at the touch point and the resistance changes. Signals are generated in both X and Y directions and then transmitted to the touch screen controller. The controller detects this contact and calculates the position of (X, Y), which then operates according to the way the mouse is simulated. The resistive touch screen is not afraid of dust, water and dirt, and can work in harsh environments. However, since the outer layer of the composite film is made of a plastic material, the explosion resistance is poor, and the service life is affected to some extent.
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  • (3) Surface acoustic wave touch screen
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  •      Surface acoustic waves are mechanical waves that propagate along the surface of a medium. An ultrasonic transducer is mounted on the corner of the touch screen. A high-frequency sound wave can be sent across the surface of the screen, and when the finger touches the screen, the sound waves on the contact are blocked, thereby determining the coordinate position. The surface acoustic wave touch screen is not affected by environmental factors such as temperature and humidity. The resolution is extremely high, it has excellent scratch resistance, long life, high light transmittance, and can maintain clear and translucent image quality, which is most suitable for public places. However, dust, water and dirt can seriously affect its performance, requiring frequent maintenance and keeping the screen clean.
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  • (4) Capacitive touch screen
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  •      The touch screen is operated by the current sensing of the human body, and a transparent special metal conductive material is attached to the surface of the glass. When a conductive object touches, the capacitance of the contact is changed, so that the position of the touch can be detected. . However, there is no reaction when wearing a gloved hand or holding a non-conducting object because of the addition of a more insulating medium. Capacitive touch screens are good for sensing light and fast touches, scratches, dust, water and dirt, making them suitable for use in harsh environments. However, since the capacitance varies with temperature, humidity or environmental electric field, its stability is poor, the resolution is low, and it is easy to drift. The performance of the above four types of touch screens is as follows: As mentioned above, the touch screen has recently developed rapidly, and the touch screen multimedia presentation system provides a full range of image display and business with its bright color picture, rich multimedia expression form and simple operation. Consulting, information inquiry and other functions.
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  •      The development of touch screens has become more specialized, multimedia, stereoscopic and large-screen. It is foreseeable that with the rapid development of touch screen technology, touch screens will play an important role in the popularization of computer technology.
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