Contaminants like dust and moisture can create unidentified zones on the screen. The advantages and drawbacks of a touch screen are summarized in the table below. OK. But, you will notice that it is not better than other HMI in every respect.
-The screen has to be big enough to be able to touch the buttons without missing. It makes the entire process time-saving and cost-saving, and enhances work flow so that efficiency increases exponentially. -Having a big bright screen and needing massive computing power to run this means a very low battery life. There are some disadvantages for the multi touch that might be a problem to some and to others might be only a simple accommodation to new technology. Multi-touch (two-touch) Disadvantages: Sensitive to EMI/RFI; Must be activated via exposed finger, thin surgical or cotton gloves, although some PCAP windows (like those used by AbraxSys) can be triggered by a heavy gloved hand .
Water may be a problem and might cause false triggering. However, this is on some occasions hardly possible, like driving a car or operating a … Considering that various input interfaces can be created with a touch screen, we can say that touch screen is a great HMI. -In direct sunlight it is much less effictian and most of the time very difficult to read the screen.
Eyes on Touch screen interfaces … Usually, separate companies make the ASIC and screen that combine into a touch screen; conversely, a trackpad's surface and ASIC are usually manufactured by the same company. Multi-touch technology brings with it a host of advantages, and that’s what we are going to enlist here. All of this touch screen technology ultimately produce the same simple output: notification of a touch, or released touch, and the x-y coordinate at which it occurs.
DISADVANTAGES. This output is very similar to that of a one-button mouse, except that coordinates are only given when actually touching the display – as if the mouse button were being pressed. Disadvantages Moving liquids or condensation can cause false touches Solid contaminants create non-touch areas until removed Doesn’t support drag or draw effectively Multi-touch sensing and processing occurs via an ASIC sensor that is attached to the touch surface. As multi-touch systems mostly rely on touch screens rather than touch tablets without display, you always need to be able to look at the surface and get discernable display information [1]. Efficient. Multi-touch facilitates use by multiple individuals at the same time. Surface Acoustic Wave (SAW)
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