Main features of the touch screen panel:
The first feature of the touch screen:
Transparency, which directly affects the visual effects of the touch screen. Transparency is a matter of transparency, infrared technology touch screen and surface acoustic touch screen is only a layer of pure glass, transparency can be considered outstanding, other touch screens should be carefully examined, "transparent," in the touch screen industry, It's just a very general concept. A lot of touch screens are multilayered composite films. It's not enough to generalize its visual effects with a little transparency. It should include at least four features: transparency, color distortion, reflectivity and clarity. It can also be subdivided, such as specular reflectivity and diffraction reflectivity, but the surface diffraction reflectance of the touch screen is not yet the same as that of the CD disk, and these four measures are basically enough for the user.
Due to the existence of transmittance and wavelength curves, the image seen through the touch screen inevitably produces color distortion with the original image. The static image feeling is only the color distortion, and the dynamic multimedia image feeling is not very comfortable. Color distortion, that is, the maximum color distortion in the picture is naturally the smaller the better. The usual transparency can only be the average transparency in the chart, of course, the higher the better. Reflection, mainly refers to the mirror reflection caused by the image overlapped behind the light, such as shadow, windows, lighting, and so on.
Reflection is the negative effect of touch screen, the smaller the better, it affects the user's browsing speed, even can not recognize the image characters in serious cases, the use environment of the sensitive screen with strong reflectivity is restricted, and the lighting layout of the scene also has to be adjusted. Most touch screens with reflective problems offer another type of surface treatment: a polished touch screen, also known as a dizzy-proof touch screen, which is slightly more expensive and has a marked decline in anti-glare reflectivity. Suitable for fully lit halls or exhibition areas, however, the dizziness of the transparency and clarity also has a significant decline. Definition, after some touch screens are installed, the handwriting is blurred, the image details are blurred, the whole screen is vague and unclear, and this is poor clarity. The definition problem is mainly caused by the repeated light and reflection refraction between the film layers, and the dizzy-proof touch screen also reduces the clarity due to the surface grinding. Poor clarity, easy to fatigue eyes, also have certain damage to the eyes, select touch-screen should pay attention to discrimination.
The second feature of touch screen:
Touch screen is absolute coordinate system, to choose which directly point that with the mouse and the nature of the relative positioning system is in place at the same time intuitive. The characteristic of the absolute coordinate system is that each positioning coordinate has nothing to do with the previous positioning coordinate. The touch screen is physically a set of independent coordinate positioning system, and the data of each touch is converted to the coordinates on the screen by calibrating the data. In any case, the output data of the same point is stable. If the touch screen is not stable, then the touch screen cannot guarantee the absolute coordinate positioning, and the point is not correct. This is the problem that the touch screen is most afraid of: drift. In principle, there is the problem of drift in every touch screen which can not guarantee the same touch point every time the sampling data is the same. At present, only the capacitive touch screen has the phenomenon of drift.
The third feature of touch screen:
Detect touch and position, all kinds of touch screen technology depend on their own sensors to work, even some touch screen itself is a set of sensors. Their positioning principles and sensors determine the speed, reliability, stability and lifetime of the touch screen.