Three characteristics of touch screen

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. Mainly used in public information query, leadership office, industrial control, military command, electronic games, a la carte, multi-media teaching, real estate pre-sale.

Touch screen features:

The first feature of the touch screen:


Transparent, it directly affects the visual effects of the touch screen. Transparent and transparent, infrared technology touch screen and surface acoustic wave touch screen only separated by a layer of pure glass, transparent can be considered, other touch screen this point we must take a good scrutiny, "transparent", in the touch screen industry, just a very The general concept is that 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. The points, such as the degree of reflection, include the degree of reflection of the mirror and the degree of diffractive reflection, but the degree of diffractive reflection on the surface of the touch screen has not yet reached the level of the CD. For the user, these four measures are basically sufficient.

Due to the existence of light transmittance and wavelength curve diagram, the image seen through the touch screen inevitably produces color distortion with the original image, and the static image feeling is still only the color distortion, and the dynamic multimedia image feeling is not very good. Comfortable, the degree of color distortion is also the largest color distortion in the picture is naturally as small as possible. The transparency usually referred to can only be the average transparency in the graph. Of course, the higher the better.

Reflective, mainly refers to the shadow caused by mirror reflection after the overlap of light and shadow, 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 severe cases, even the image characters cannot be recognized. The use environment of the reflective touch screen is limited, and the lighting arrangement at the scene 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, and the anti-glare type reflectivity is significantly reduced, and it is suitable for halls or exhibitions where lighting is very abundant. However, the anti-glare type of light transmission and sharpness have also dropped significantly. The sharpness, after some touch screens are installed, the writing is blurred, the image details are blurred, the entire screen is vague and unclear, which is the poor definition. The problem of sharpness is mainly a touch screen of a multi-layer thin film structure, which is caused by repetitive reflection and refraction of light between the thin film layers. In addition, the anti-glare type touch screen also causes a decrease in 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 the 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 time the data touched by the calibration data is converted to the screen coordinates, so that requirements 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, this is the touch screen most afraid of the problem: drift. The technical principle is that there is no guarantee that the touch screen that touches the same data for the same touch every time will inevitably drift. This is a capacitive touch screen.

The third feature of the 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.

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