Capacitive touch screen with high resolution, light transmission rate is also good, can satisfy the various demands in public places is the touch screen. However, the capacitive touch screen human body as a capacitor electrode use when the the conductor near large enough capacitance coupling between the laminated ITO face, the current flow away will cause capacitive touch screen malfunction; another gloved or handheld insulating object touching when no response, this is because the increase of the insulating medium.
Infrared touch screen is off to rely on the determination of the infrared touch position is determined, the a transparent bezel material is chosen with the touch screen contents (simply do not use any shutter). Therefore, the choice of good light transmission properties baffle, and to be anti-reflective treatment, you can get a good visual effect. But by the infrared emission tube size restrictions, it is not possible to transmit high-density infrared touch screen resolution is not high. In addition, because the infrared touch screen relies on infrared sensors to work, changes in ambient light, such as sunlight or indoor light, etc. will affect its accuracy.
Resistive touch screen work environment completely isolated from the outside world, it is not afraid of dust, water, gas and oil, can be used to touch any object, more suitable for use in the field of industrial control. The disadvantage is that the outer layer of the composite film plastic, too hard or use sharps touch may scratch the touch screen.
Surface acoustic wave technology is very stable, and surface acoustic wave touch screen controller by measuring the decay time on the timeline to calculate the touch location, so its accuracy is very high. The surface acoustic wave touch panel having a third axis (z-axis) is pressure axis - can be obtained by calculating the attenuation amount of the reception signal attenuation at the strength of the user touches the screen size can be divided into up to 2 5 6 efforts. The greater the force, and also the wider the reception signal on the waveform attenuation notch deeper, in all of the touch screen, only the surface acoustic wave touch screen having the perception of the performance of the touch pressure.
Applications
Based on the analysis of the structure, principle and performance characteristics of the touch screen, the type of touchscreen applicable Occasion follows:
Wire resistive touch screen: not afraid of dirt, oil and photoelectric interference afraid of scratching their main weakness. Applies to fixed users in public places, such as industrial control field, office, home and so on.
Five-wire resistive touch screen: excellent sensitivity and light transmission, long service life, not afraid of dust, grease and optical interference, applies to all public places, especially for applications that require precision industrial control field.
Capacitive sensing touch screen: capacitance with temperature, humidity, or ground conditions different changes, so the stability is poor, tend to produce drift. Afraid of electromagnetic interference, drift, not readily available in the industry control and interference. Can be used to require less sophisticated public information inquiries; need for frequent calibration, positioning.
Surface acoustic wave touch screen: plain glass, translucent best, long life, good scratch resistance, suitable for various public places unknown user. But the fear of a long period of accumulation of dirt and oil dip, so use the environment clean place better. Otherwise, the need for regular cleaning service.
Development trends
Touchpad: touchpad with a pressure-sensitive capacitive touch technology, the screen area. It consists of three parts: the bottom center sensor is used to monitor the touch panel is touched, and then processes the information, the intermediate layer provides the interaction with the graphics, text, etc., the outermost layer is the touch surface by high strength the plastic material. Fingers tap the outer surface within a thousandth of a second can this information to the sensor and the registration processing. In addition to PC-compatible, it also has high brightness, image clarity, ease of interaction, which is applied to the pointing information query system (such as electronic bulletin boards), has received very good results.
Touch-screen technology to facilitate the operation of the computer used is a very promising interactive input. Countries in the world this generally give attention to, and put a lot of manpower and material resources for research and development continue to emerge, the new touch screen.
Touch pen: using the touch pen to operate the touch screen similar to the whiteboard, in addition to the display interface, windows, icons, touch pen also has a signature, the function of the mark. Touch pen than earlier only light pen to select the menu function is greatly enhanced.
In short, the development of touch screen showing the trend of specialization, multimedia, three-dimensional and large-screen and so on. With the development of the information society, people need access to a variety of public information. Public information transmission system with touch screen manufacturer for interactive window through the use of advanced computer technology, the use of text, images, music, narration, animation, video and other forms, intuitive, to introduce a variety of information to the people, to people with to great convenience. It can be foreseen that with the rapid development of touch screen technology, touch screen applications will be more and more widely, the performance will be getting better and better.
Infrared sensor touch screen: a lower resolution, but is not current, voltage and electrostatic interference, suitable for harsh environmental conditions; suitable for infrared and light interference of various public places, offices and the requirements are not very sophisticated industrial control scene.
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