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Touchscreens or Human Machine Interface (HMI)

2.      Capacitive Touchscreen Technology
The Capacitive Touchscreen Technology is the most popular and durable touchscreen technology used all over the world at most. It consists of a glass panel coated with a capacitive (conductive) material Indium Tin Oxide (ITO). The capacitive systems transmit almost 90% of light from the monitor. Some of the devices using capacitive touchscreen are Motorola Xoom, Samsung Galaxy Tab, Samsung Galaxy SII, Apple’s iPad. There are various capacitive technologies available as explained below.
Surface-Capacitive screens, in this technique only one side of the insulator is coated with a conducting layer. While the monitor is operational, a uniform electrostatic field is formed over the conductive layer. Whenever, a human finger touches the screen, conduction of electric charges occurs over the uncoated layer which results in the formation of a dynamic capacitor. The computer or the controller then detects the position of touch by measuring the change in capacitance at the four corners of the screen.
Pros and Cons: The surface capacitive touchscreen is moderately durable and needs calibration during manufacture. Since a conductive material is required to operate this screen, passive stylus cannot be used for surface capacitive touchscreen.
Capacitive Touch Screen Technology
In the Projected-Capacitive Touchscreen Technology, the conductive ITO layer is etched to form a grid of multiple horizontal and vertical electrodes. It involves sensing along both the X and Y axis using clearly etched ITO pattern.
Projected Touchscreen technology
The projective screen contains a sensor at every intersection of the row and column, thereby increasing the accuracy of the system. There are two types of projected capacitive touchscreen: Mutual Capacitance and Self Capacitance


One or two to reemmber, that is.

marvalous information....


after reading that i  know what is the difference between iphone touchpad and other phone ............................................................nice it verry excellent,really nice



Nice, I got  more information about Touchscreen



can anybody help me in how to interface such touch screen display ? how to display anything or how to get input? etc....

This article has described touch screen technology comprehensively.It's very usefull.I think infrared will be most popular in the future.Not only because it has lower cost than other touch technology,but also it has the plural touch technology,you can build many accurate touch points in a infrared touch screen.I'd like to recommend a infrared multitouch screen,which is easy to get and to set up for end customer.check

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I'm giving a presentation on touchscreen technology thanks 4 this information

Capacitive touch interface has come of age and is advancing. Thanks for the info. Loking forward to more