Article: Touchscreen technologies in phones
Images depicting the different technologies are courtesy of planarembedded.com
Resistive (Pressure sensitive) touchscreen:
As we’ve mentioned above, this is the most widely used touchscreen scheme for the production of mobile phones. It is most common in the Windows Mobile Professional phones, for example HTC TyTN II or HTC Touch Diamond; it is resistant to water and dust, but it is easily scratched and cannot be used with sharp objects. It is represented by three types: 4-wire, 5-wire and 8-wire with the second one being the most used. In contrast to the other types it is composed of three layers, rather than two with the additional layer ensuring greater durability and a much longer life (35 million clicks, instead of 1 million), without impacting the price.
Capacitive (Electrostatic) touchscreen:
Lately, this type of technology has been gaining popularity in the mobile phone industry, its most renowned representatives being Apple’s iPhone and LG PRADA. The smaller market share of phones with such screens is due mostly to their high price, since this is not a cheap method. It has two main subtypes, one of which cannot register more than one touch at a time, while the other, called „MultiTouch” by their creators (Apple and used in iPhone and iPod) can. In addition, despite not being the first to employ it, these two devices made this type of technological method popular.
Infrared (IR) touchscreen:
Samsung SGH-E900 and Samsung U600, which can only be touched with warm objects (e.g. fingers). Unfortunately, you’ll be unable to operate the phone if your fingers are “frozen”, because of cold weather.
The optical technological method uses infrared beams, which are not visible to the human eye and its only representative among the mobile phones is Neonode N2. It works, using a number of sensors, arranged above and around the screen, forming a grid of invisible beams. If an object (e.g. a finger or a stylus) touches the display, it interrupts the rays in a certain area and thus the touch point is determined. For this system it is not necessary to use physical force and just a gentle touch is enough. 100 % of the light, emitted by the display, is let through and its life depends only on the sensors’ lives, which spans for about 7 years of being constantly lit up. Further on, it is not influenced by dust, moisture or scratches, since actually the display’s glass simply shows the picture, while the sensors above it do the rest. However, a rather big disadvantage of this type of technology is that a strong ambient light can have a negative impact on its productivity and precision.
1. xmguy (unregistered)
Very good story.
Just wait until the iPhone fanboys come in
Primitive technology. Wait til the Blackberry Thunder comes out. Apple fanboys will be STUNNED!
primitive? thunder uses capacitive technology..same as iphone...thunder is just setup differently
4. Dexter (unregistered)
Bravo Phone Arena. Great piece and you managed not to work in a spy story or other unwanted coloring. Very educational, please write more articles like this.
12. Anomalies (Posts: 61; Member since: 08 Jun 2008)
I agree, this was an amazing article and I learned a lot. I however do like leaked information on phones =/
Ha, makes me want to buy a neonode 8P
very nice story...keep em coming
8. Shelley (unregistered)
Great article---so, who makes the technology? It would be great to purchase the stock/s.
9. mmeee (unregistered)
Yes, very good article. Informative and interesting, keep em comming!
i second #12 phonearena who are the major producors of the infared tochsceens? and the only thing ur site is missing is more articals like this one. keep em coming, please.
11. PC (unregistered)
Wow, could you image a phone that supports all 5 fingers. I want microsoft to get into the cell phone industry themselves. That would make Steve Jobs crap his pants.
when would u use five fingers simultaneously on a phone? just out of curiosity
I'm sure i read this at the resistive touchscreen: "Unfortunately, this method cannot report more than one touch at a time" Am I right? If yes, than the writer is too uninformed. Resistive touchscreen can report more than one touch at a time. I you don't beleive, visithttp://www.simasystems.com/ind
15. zForce FanBoy (unregistered)
The Neonode zForce Technology which is opitacal/infrared touch screen based can do Multitouch, has no issues in working direct sunlight, which would be the brightest of ambient lights, and also when comparing to Capacitive and Resistive touch-screens on a same production volume, the zForce Technology is actually the CHEAPEST!!!
16. evman (unregistered)
the iphone so far has the most advanced touch screen
17. X3V3N (unregistered)
i agree, i like the apple Touch UI its sweet, just wish the phone part of it was better. ( i drop hella calls)
thats because of the network, not the phone.
20. hi (unregistered)
ikr dats lyk so coool