Resistive touchscreen

In electrical engineering, a resistive touchscreen is a touch-sensitive computer display composed of two flexible sheets coated with a resistive material and separated by an air gap or microdots.[2]

A Palm Centro, an example of a smartphone with a resistive touchscreen.[1]

Description and operation

There are two different types of metallic layers. The first type is called matrix, in which striped electrodes on substrates such as glass or plastic face each other. The second type is called analogue which consists of transparent electrodes without any patterning facing each other. As of 2011 analogue offered lowered production costs. When contact is made to the surface of the touchscreen, the two sheets are pressed together. On these two sheets there are horizontal and vertical lines that, when pushed together, register the precise location of the touch. Because the touchscreen senses input from contact with nearly any object (finger, stylus/pen, palm) resistive touchscreens are a type of "passive" technology.

For example, during operation of a four-wire touchscreen, a uniform, unidirectional voltage gradient is applied to the first sheet. When the two sheets are pressed together, the second sheet measures the voltage as distance along the first sheet, providing the X coordinate. When this contact coordinate has been acquired, the voltage gradient is applied to the second sheet to ascertain the Y coordinate. These operations occur within a few milliseconds,[3][4] registering the exact touch location as contact is made, provided the screen has been properly calibrated for variations in resistivity.[5]

Resistive touchscreens typically have high resolution (4096 x 4096 DPI or higher), providing accurate touch control. Because the touchscreen responds to pressure on its surface, contact can be made with a finger or any other pointing device.

Comparison with other touchscreen technology

Resistive touchscreen technology works well with almost any stylus-like object, and can also be operated with gloved fingers and bare fingers alike. In some circumstances, this is more desirable than a capacitive touchscreen, which needs a capacitive pointer, such as a bare finger (though some capacitive sensors can detect gloves and some gloves can work with all capacitive screens). A resistive touchscreen operated with a stylus will generally offer greater pointing precision than a capacitive touchscreen operated with a finger. Costs are relatively low when compared with active touchscreen technologies, but are also more prone to damage.[6] Resistive touchscreen technology can be made to support multi-touch input.[7]

For people who must grip the active portion of the screen or must set their entire hand down on the screen, alternative touchscreen technologies are available, such as active touchscreen in which only the stylus creates input and skin touches are rejected. However, newer touchscreen technologies allow the use of multi-touch without the aforementioned vectoring issues.[7]

Where conditions allow bare finger operation, the resistive screen's poorer responsiveness to light touches has caused it to generally be considered for use with low resolution screens and to lose market share to capacitive screens in the 21st century.[8] Projected capacitive touchscreen technology overtook resistive touchscreen technology in revenue in 2010 and in units in 2011.[9]

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See also

References
  1. "Palm Centro - Full phone specifications". www.gsmarena.com. Retrieved 2016-12-26.
  2. Walker, Geoff (August 2012). "A review of technologies for sensing contact location on the surface of a display". Journal of the Society for Information Display. 20 (8): 413–440. doi:10.1002/jsid.100.
  3. Resistive Touchscreen
  4. "Using resistive touch screens for human/machine interface" (PDF). Texas Instruments.
  5. Touch Screen Calibration Global Display Engineering
  6. Lee, David (28 December 2010). "Capacitive vs. Resistive Touchscreens". R-Tools Technology, Inc. Retrieved 9 September 2012.
  7. "Stantum's mind-blowing multitouch interface on video!". 19 Feb 2009. Retrieved 20 November 2012.
  8. Capacitive vs Resistive Andrew Williams, Know your Cell
  9. Walker, Geoff (August 2012). "A review of technologies for sensing contact location on the surface of a display". Journal of the Society for Information Display. 20 (8): 413–440. doi:10.1002/jsid.100.
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