- 4-Wire Multi-Touch Touch Screens Series TP01 www.nkkswitches.com 3. Smooth, light and multi-touch operation on resistive touch screens. Combining with controller board facilitates multi-touch operation characterized by pinching screen to zoom in, spreading screen to zoom out, rotation, etc.
- A touchscreen or touch screen is the assembly of both an input ('touch panel') and output ('display') device. The touch panel is normally layered on the top of an electronic visual display of an information processing system.The display is often an LCD or OLED display while the system is usually a laptop, tablet, or smartphone.A user can give input or control the information processing system.
- 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. There are two different types of metallic layers. The first type is called matrix, in which striped.
A Palm Centro, an example of a smartphone with a resistive touchscreen.[1]
In electrical engineering, a resistive touchscreen is a touch-sensitivecomputer display composed of two flexible sheets coated with a resistive material and separated by an air gap or microdots.[2]
Description and operation[edit]
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.[citation needed] 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.
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. Resistive touchscreen technology can be made to support multi-touch input. Single-touch screens register multiple touch inputs in their balanced location and pressure levels.
For example, during operation of a four-wire touchscreen, a uniform, unidirectional voltagegradient 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[edit]
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. Single-touch screens register multiple touch inputs in their balanced location and pressure levels.[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]
Resistive touch screens are insensitive to water, allowing underwater usage for water-resistant devices.[10]
See also[edit]
References[edit]
- ^'Palm Centro - Full phone specifications'. www.gsmarena.com. Retrieved 2016-12-26.
- ^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.
- ^Resistive Touchscreen
- ^'Using resistive touch screens for human/machine interface'(PDF). Texas Instruments.
- ^Touch Screen Calibration Global Display Engineering
- ^Lee, David (28 December 2010). 'Capacitive vs. Resistive Touchscreens'. R-Tools Technology, Inc. Retrieved 9 September 2012.
- ^ ab'Stantum's mind-blowing multitouch interface on video!'. 19 Feb 2009. Retrieved 20 November 2012.
- ^Capacitive vs Resistive Andrew Williams, Know your Cell
- ^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.
- ^'Garmin Nüvi 500 waterproof test'. 2008-09-05.
External links[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Resistive_touchscreen&oldid=1003732240'
Most people are familiar with the general principle behind touchscreen technology: the interface works by determining the point of your touch, using this information to determine which icons or buttons the operator is pressing. But there are several different types of touchscreen technology, including multi-touch. Today, we’re going to take a closer look at multi-touch, revealing how it works and why it’s becoming such a popular choice among touchscreen manufacturers.
Multi-touch is essentially a type of technology that allows a device to recognize and process multiple touches simultaneously. Most touchscreen devices are only capable of recognizing a single touch. So if you attempt to place your fingers on two different areas of the device at the same time, it will only register the location touched by your first finger and not your second. Multi-touch technology is designed to eliminate this problem by supporting the use of multiple, simultaneous touches.
So, what benefits (if any) does multi-touch technology offer? Being able to identify multiple points of contact opens the doors to a while new world of applications and possibilities. Devices that support multi-touch technology, for instance, can be implement functionality like pinch-to-zoom, the activation of subroutines which are attached to gestures, additional controls and much more. Of course, this is really just the tip of the iceberg when it comes to the benefits of using multi-touch technology.
Typically, the multi-touch technology works in conjunction with an ASIC sensor that is fixed on the device’s surface. The sensor identifies the point or points of touch, relaying this information to the device’s on-board computer system.
There are also multi-touch gestures, which as the name suggests, support the use of predefined motions to interact with the respective device. You can find a variety of laptops, smartphones and tablet computers with multi-touch gestures.
You can find multi-touch technology being used in a wide range of different smartphones, tablets and other touchscreen-enabled devices, including both the iPhone and iPad. Apple, Inc. actually holds several patents related to the implementation of multi-touch technology. The tech giant event attempted to trademark the word “Multi-touch,” although this request was rejected by the Patent and Trademark Office, citing the reason of it being too generic.
How Do Resistive Touch Screens Work
What are your thoughts on multi-touch technology?
Multi Touch Monitor
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