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How Gloves Touchscreen
- Apr 20, 2018 -

Touchscreen gloves are special gloves used to operate capacitive touchscreen products in winter.

Technical principle:

Previous resistive touch screens can only determine one touch point at a time when working with a hand. If there are two or more touch points, correct judgments cannot be made, so resistive touch screens are only suitable for clicks, dragging, etc. Some simple actions to judge. The multi-touch of the capacitive touch screen can be used to decompose the user's touch into two functions of collecting multi-point signals and judging signal meanings, thereby completing the judgment of complex motions.

The surface touched by the resistive touch screen finger is a hard coating to protect the underlying PET (polyester film) layer. There are two transparent conductive layers ITO (Indium oxide, weakly conductive) between the surface protective hard coat and the glass substrate. Body, respectively, corresponding to the X, Y axis, with a transparent insulating particles between the insulation, the pressure generated by the touch will make two conductive layers connected, press a different point, the resistance value of the point to the output is also different, so The voltage signal (analog quantity) corresponding to the position of the point will be output. After A/D conversion, the coordinate values of X and Y can be obtained. This is the most basic principle of resistive touchscreens.

The capacitive single touch screen single-point capacitive touch screen uses only a single layer of ITO. When the finger touches the surface of the screen, a certain amount of charge is transferred to the human body. In order to restore these charge losses, the charge is added from the four corners of the screen. The amount of charge added in each direction is proportional to the distance of the touch point. From this point, we can calculate the position of the touch point.

A resistive touch screen can only judge one touch point at a time. If more than two points are touched at the same time, it cannot make a correct response, or the reaction is confusing.

The multi-touch task that evolved to a multi-point capacitive touch screen can be decomposed into two aspects. One is to collect multiple signals at the same time, and the other is to judge the meaning of each signal, which is called gesture recognition. Compared to touch technology that can only accept single-point input, multi-touch technology allows users to simultaneously touch the display screen in multiple places so that they can flex and rotate web pages or pictures. The Apple iPhone only allows two fingers to operate, so it can be called "double touch", and Microsoft's upcoming Surface computer can respond to 52 touch points at the same time.

In order to realize the multi-touch function, the multi-touch screen and the single-touch screen have completely different structures. From the outside of the screen, the single-touch screen has only a few signal lines (usually 4Pin or 5Pin), while the multi-touch screen has many leads; from the inside, the conductive layer of a single touch screen is just a flat panel, and multiple touches The control panel is divided into a plurality of relatively independent touch units on the flat panel. Each touch unit is connected to an external circuit through independent leads, and all the touch units are arranged in a matrix on the board. In this way, when the user's finger touches a certain part of the screen, a signal is output from the corresponding detection line. When the finger moves to another location, it will output the signal from another detection line.