เปรียบเทียบเทคโนโลยี Touch screen แบบต่างๆ โดยเฉพาะ capcitive vs resistive

ไม่ว่ามือถือรุ่นใหม่ๆหรือ tablet PC จะเป็น iphone หรือ android ทุกวันนี้ก็ต้องมี Technology สำคัญคือระบบ Touch screen แต่จะมีกี่คนที่เข้าใจว่าระบบ Touch screen ทุกวันนี้ที่นิยมใช้กันนั้นมีกี่แบบ

ลองศึกษาความแตกต่างและคุณสมบัติต่างๆจากตารางดังต่อไปนี้ได้เลย

Unhidden Content - Enjoy The View!

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<table class="wikitable"> <tbody><tr> <th>Technology</th> <th>4-Wire Resistive</th> <th>Surface Acoustic Wave</th> <th>5-Wire Resistive</th> <th>Infrared</th> <th>Capacitive</th> </tr> <tr> <th>Durability</th> <td>3 year</td> <td>5 Year</td> <td>5 Year</td> <td>5 Year</td> <td>2 Year</td> </tr> <tr> <th>Stability</th> <td>High</td> <td>Higher</td> <td>High</td> <td>High</td> <td>Ok</td> </tr> <tr> <th>Transparency</th> <td>Bad</td> <td>Good</td> <td>Bad</td> <td>Good</td> <td>Ok</td> </tr> <tr> <th>Installation</th> <td>Built-in/Onwall</td> <td>Built-in/Onwall</td> <td>Built-in/Onwall</td> <td>Onwall</td> <td>Built-in</td> </tr> <tr> <th>Touch</th> <td>Anything</td> <td>Finger/Pen</td> <td>Anything</td> <td>Finger/Pen</td> <td>Conductive</td> </tr> <tr> <th>Intense light-resistant</th> <td>Good</td> <td>Good</td> <td>Good</td> <td>Bad</td> <td>Bad</td> </tr> <tr> <th>Response time</th> <td><10ms</td> <td>10ms</td> <td><15ms</td> <td><20ms</td> <td><15ms</td> </tr> <tr> <th>Following Speed</th> <td>Good</td> <td>Low</td> <td>Good</td> <td>Good</td> <td>Good</td> </tr> <tr> <th>Excursion</th> <td>No</td> <td>Small</td> <td>Big</td> <td>Big</td> <td>Big</td> </tr> <tr> <th>Monitor option</th> <td>CRT or LCD</td> <td>CRT or LCD</td> <td>CRT or LCD</td> <td>CRT or LCD</td> <td>CRT or LCD or LED</td> </tr> <tr> <th>Waterproof</th> <td>Good</td> <td>Ok</td> <td>Good</td> <td>Ok</td> <td>Good</td> </tr> </tbody></table>
อ้างอิงจาก http://en.wikipedia.org/wiki/Touchscreen

มีข้อมูลน่าสนใจมาเพิ่มเติมครับ Resistive vs Capacitive

<table border="2" cellpadding="9" cellspacing="9"> <tbody> <tr> <td> </td> <td>Resistive touchscreen</td> <td>Capacitive touchscreen</td> </tr> <tr> <td>Visibility indoors</td> <td>Typically very good</td> <td>Typically very good</td> </tr> <tr> <td>Visibility in sunlight</td> <td>Typically poor, the extra layer reflects too much ambient light.</td> <td>Typically very good.</td> </tr> <tr> <td>Touch Sensitivity</td> <td>Pressure is needed to make the contact within the screen's layers, can be affected with fingers (even with gloves on), fingernails, stylus, etc. The latter is important in Asian markets and anywhere where gesture or character recognition is important.</td> <td>Even the slightest contact of your electron-rich finger with the screen's glass is enough to activate the capacitive sensing system below. Doesn't work with inanimate objects/fingernails/gloved fingers. Handwriting recognition is therefore cumbersome.</td> </tr> <tr> <td>Accuracy</td> <td>Accurate to at least display pixel resolution, as can be seen when drawing (or writing characters) with a stylus. Useful for handwriting recognition and interfaces with smaller control elements.</td> <td>Accurate to within a few pixels, in theory, but seriously limited by the physical size of your fingertips, which make it hard to accurately press any control element or select something on screen that's smaller than 1cm2.</td> </tr> <tr> <td>Cost</td> <td>Cheap to use in a phone design.</td> <td>Definitely more expensive than resistive screens, by between 10% and 50%, depending on who you talk to. On a flagship device, the extra build cost isn't that important, for a mid-priced phone, using a capacitive screen might be prohibitive.</td> </tr> <tr> <td>Possibility for multi-touch</td> <td>None, without re-engineering the way a resistive screen is wired into a device's electronics.</td> <td>Depends on implementation and software, but used in the iPhone and tech-demoed on the HTC-made G1. Also may be legal battles with Apple, depending on how multi-touch is used?</td> </tr> <tr> <td>Robustness</td> <td> The very nature of resistive screens means that their top layer is soft, soft enough to press down and indent. This makes such a screen vulnerable to scratches and other minor damage. A resistive screen also gradually wears out and requires more frequent calibration.
On the plus side, a resistive layer over a plastic screen does make for a device that's generally robust and unlikely to be damaged by a fall.
</td> <td>Glass can be used as the outer layer. Although not invulnerable (and certainly prone to shattering on major impact), glass is more resistant to casual scratches and blemishes.</td> </tr> <tr> <td>Hygiene</td> <td>Because a stylus or fingernail can be used to effect each touch, there's a potential for less fingerprints, finger grease and germs to be transferred to the screen.</td> <td>Full finger touch is needed on the screen, but the use of glass as the main material means that the screen's also very quick and easy to clean.</td> </tr> <tr> <td>Environmental concerns</td> <td>Nokia has stated that the Nokia 5800, like all their phones, will work happily between -15°C and +55°C and at all real world humidities.</td> <td>Typical operating temperature is 0° to 35°, requires at least 5% humidity (for capacitive effect to work)</td> </tr> </tbody> </table> Ref: Resistive vs Capacitive: the invisible tech war in which both opponents can win? - All About Symbian Feature

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