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Touch screen is also called touch panel. It is an inductive liquid crystal display device that can receive input signals such as contacts. When you touch a graphic button on the screen, the haptic feedback system of touch screen can drive various linking devices according to pre-programmed programs, which can be used to replace mechanical button panels and create vivid video and audio effects through liquid crystal display screens. Touch screen is a newest computer input device. It is the simplest, most convenient and natural human-computer interaction method. It gives multimedia a new look and is an attractive new multimedia interactive device, which is mainly used in public information query, leadership office, industrial control, military command, electronic games, click to order, multi-media teaching, real estate pre-sale, etc.

The first feature of touch screen:
Transparent, it directly affects the visual effects of the touch screen. Transparent also to a certain extent, infrared technology touch screen and surface acoustic wave touch screen only separated by a layer of pure glass, better transparency, other touch screen in this point we must take a good scrutiny, "transparent", in the touch screen industry, just a very general concept. Many touch screens are multi-layer composite films. It is not sufficient to summarize the visual effects with only a single point of transparency. It should include at least four characteristics: transparency, color distortion, reflection, and clarity.

Due to the existence of light transmission and wavelength curve, the image seen through the touch screen inevitably produces color distortion with the original image. The static image feeling is still only the color distortion, and the dynamic multimedia image feeling is not very comfortable, the color distortion is naturally as small as possible.

Reflective, mainly refers to the overlapping light and shadow on the image caused by mirror reflection, such as silhouette, windows, lights and so on. Reflection is the negative effect brought by the touch screen. The smaller the better, it affects the user's browsing speed. In serious cases, even the characters of the screen cannot be recognized. The use environment of the reflective screen with strong light reflection is limited, and the lighting arrangement on the spot is forced to be adjusted. Most touch screens with reflective problems offer another type of surface treatment: matte touch screen, also called anti-glare type, the price is slightly higher. The anti-glare type reflectively is obviously reduced, and it is suitable for halls or exhibitions where the lighting is very abundant. However, light transmission and sharpness of the anti-glare type have also dropped significantly. The sharpness, after some touch screens are installed, the writing and the image details are blurred, the entire screen is vague and unclear, which is the poor definition. The problem of sharpness is mainly a multi-layer thin film structure of the touch screen, which is caused by repeated light reflection and refraction between the thin film layers, and in addition, the anti-glare type touch screen also have a reduction in the sharpness due to surface frosting. The sharpness is not good, the eyes are easily fatigued, and the eyes are also hurt. When buying a touch screen, it is necessary to pay attention to the judgment.

The second feature of touch screen:
The touch screen is an absolute coordinate system. To directly select the touch screen, the essential difference between a relative positioning system such as a mouse is one-time intuitiveness. Absolute coordinate system is characterized by each position coordinate has nothing to do with the last position coordinate, the touch screen is physically a set of independent coordinate positioning system, each touch data is converted to the screen coordinates through the calibration data, so that it requires no matter under what circumstances the touch screen set of coordinates, the output data of the same point is stable, if not stable, then this touch screen can not guarantee the absolute coordinate positioning. The point is not accurate is the touch screen most afraid of the problem: drift. In principle, all touch screens that cannot ensure that the same point touches the same sampling data every time have a problem of drift. At present, only the capacitive touch screen has a drift phenomenon.

The third feature of touch screen:
Detecting touch and positioning, various touch screen technologies rely on their own sensors to work, and even some touch screens are themselves a set of sensors. The respective positioning principle and the respective sensor used determine the response speed, reliability, stability and life of the touch screen.

touch screen

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