Touch screen technology can be mysterious if you ever stop to wonder what really makes a screen recognize your finger, pen, or stylus. As technology advances, touch screens are becoming more popular because they make the user interface more exciting and intuitive for people new to modern tech gadgetry. There are three basic systems used in screens to recognize your touch and at the writing of this article, infrared technology is making its way as the fourth system as well as others in development for different scale products.
The first is a resistive system that uses a conductive and resistive metallic sheet to cover a glass panel. The two layers are held apart by spacers with electrical currents running through both layers when the screen is on. There is also a scratch protection layer that covers the metallic layer to keep the screen from being destroyed too easily. When the user touches the screen, the two layers are forced to touch each other at that spot. There is a change in the electrical field when the contact is made and the coordinates of the point of contact are fed to a computer which calculates where that is on the screen and in turn tells the operating system which determines what a touch on that particular spot means.
Monitor Touch Screen
The capacitive system is built with a layer that holds an electrical charge right on top of the glass panel. When a finger touches the screen, some of the charge escapes into the finger. The decrease in charge is measured in circuits which are usually located at the corners of the screen. And from the relative change in charge at each corner the computer can calculate what the point of contact was with the finger that released some of the charge.
The surface acoustic wave system uses a pair of transducers along the sides of the glass plate. And reflectors are placed in the glass plate to reflect the electrical signal that is sent from one sending transducer to one receiving transducer. When a finger touches the screen, the electrical signal is disturbed and using two axes the computer can calculate the precise area of contact.
Because the surface acoustic system does not use a metallic plate, it allows 100 percent of light from the monitor through for perfect clarity. As opposed to the resistive system which transmits about 75 percent of the monitors light and the capacitive system which transmits about 90 percent for improved image quality over the resistive system.
Cyber Monday WinTouch 18.5" Touch Screen Kit, Converts your PC Monitor to Touch Screen via USB, No Installation Required - Fits Monitors up to 18.5" 2011 Deals
Dec 04, 2011 22:01:56
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Cyber Monday WinTouch 18.5" Touch Screen Kit, Converts your PC Monitor to Touch Screen via USB, No Installation Required - Fits Monitors up to 18.5" Feature
- Easy to use - Attach to your PC monitor, install software and plug into USB Port
- Compatible with WIN 7, Vista, Win XP, Win 2000
- Fits all monitors up to 18.5"
- Works with human finger or with pen - Pen Included
Cyber Monday WinTouch 18.5" Touch Screen Kit, Converts your PC Monitor to Touch Screen via USB, No Installation Required - Fits Monitors up to 18.5" Overview
A New Solution for your computer experience - WinTouchWinTouch with USB interface can fully support any TFT LCD monitor and make it become touch-able, enabling user to enjoy the operation of a touch screen computer .
Features:
* Touch package software can help you adjust the function of WinTouch
* USB 2.0 interface
* Easy use and install , just plug and play
Specification:
SPACER - Patented technology
LCD SIZE - 18.5" (16:9)
VIEWABLE AREA - 16 3/8 x 9 3/8" (416.40 X 237.00 mm)
ACTIVE AREA - 16 1/8 x 9 1/8" (411.00 X 231.60 mm)
TRANSMITTAL - 82% ± 5%
Surface Hardness - ?3H (JIS K5400)
TOUCH RESOLUTION - 4096 x 4096
INTERFACE CONTROLLER - External controllers: USB port
OPERATING SYSTEMS - Windows XP, 2000,VISTA,Windows7
HID MODE - Digitizer HID-Vista or Windows7 / Mouse HID
ACTIVATION FORCE - ?50g
RESPONSE TIME - 10 msec maximum.
POSITION ACCURACY - 3 mm maximum error.
OPERATING TEMPERATURE - -10°C to +60°C
STORAGE TEMPERATURE - -40°C to +75°C
HUMIDITY - Pass 40 degrees C, 95% RH for 96 hours.
DURABILITY - Finger Touch :35M touches / Pen Hitting :10M touches
Package Contents:
- Touch Panel
- USB Cable
- Touch Pen
- CD - Includes driver, English Manual and user guide
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