The disadvantage of the resistivity touch screen is that the outer film is easily scratched, which makes the touch screen unusable. The multi-layer structure will lead to great light loss. For handheld devices, it is usually necessary to increase the backlight source to make up for the poor light transmission, but this will also increase the consumption of the battery.
The disadvantages of the resistive touch screen can be classified as:
1. The resistive-type touch screen can be designed as multi-touch, but when two points are pressed at the same time, the pressure on the screen becomes unbalanced, leading to errors in touch control, so it is difficult to realize multi-touch control.
2. Resistive touch screen is easy to damage the touch part of the screen due to scratches.
The body part of the resistive touch screen is a multilayer composite film, which is made of a layer of glass or plexiglass as the base layer, and the surface is coated with a transparent conductive layer (ITO film), which is covered with a layer of hardened and smooth scratch resistant plastic layer on the outer surface.Its inner surface is also coated with ITO, separated by a number of tiny transparent points (less than a thousandth of an inch) between the two conductive layers.When the finger touches the screen, the two layers of ITO touch and the resistance changes. The controller calculates the coordinate of the contact point according to the detected resistance change, and then carries out the corresponding operation according to this coordinate. Therefore, this technology must be applied to the screen to obtain the touch effect.
Thanks to resistive screen technology, fingers (even with gloves), nails, stylus, etc., can be used and handwriting recognition is supported.As can be seen from the stylus touch, the resistive screen is at least as accurate as a single display pixel, and it is not easy to leave fingerprints.And importantly, resistive screens are relatively inexpensive.Low cost natural sales price will also be reduced.
Due to the fundamental characteristics of resistive screen, the outer layer of resistive screen must be a soft plastic layer, so the resistive screen of mobile phone screen will have a soft feeling when pressed, and it is very easy to produce scratches.The upside is that it's not easy to break.
There is evidence that the use of resistive screen Nokia5800 can to 15 ° C to + 45 ° C temperature to work properly,, there is no requirement of humidity, so the resistance screen to the environment request is not high, no matter where you are basically can be used.The downside is that in sunlight, the extra layer of the resistive screen will reflect a lot of sunlight, so the effect is not very good.