Touch Screen Compare

01/06 haijun

Touchscreen Types

 5-Wire Resistive Touchscreens 4-Wire Resistive Touchscreens 8-Wire Resistive Touchscreens Capacitive Touchscreens

Surface Acoustic Wave Touchscreens
Technology Utilizes the bottom substrate for both X- and Y-axis measurements. The flexible coversheet acts only as a voltage-measuring probe. This means the touchscreen continues working properly even with non uniformity in the cover sheet's conductive coating. The result is an accurate, durable and reliable touchscreen that offers drift-free operation. Must use two layers to create X- and Y-axis measurements. For the Y axis, the flexible top coversheet acts as a uniform voltage gradient, while the bottom substrate acts as the voltage probe. The constant flexing that occurs on the outer coversheet will change its electrical characteristics (resistance) with use, degrading the linearity and accuracy of this axis. Eight-wire resistive technology is very similar to four-wire technology. The primary difference is the addition of four more sensing points, which are used to stabilize the eight-wire system and reduce the drift caused by environmental changes. It consists of a glass panel with a capacitive (charge storing) material coating its surface. Circuits located at corners of the screen measure the capacitance of a person touching the overlay. Frequency changes are measured to determine the X and Y coordinates of the touch event. It is based on sending acoustic waves across a clear glass panel with a series of transducers and reflectors. When a finger touches the screen, the waves are absorbed, causing a touch event to be detected at that point.
Advantages
  • High touch resolution
  • Pressure sensitive, works with any stylus ·
  • Not affected by dirt, dust, water, or light ·
  • More durable then 4-Wire Resistive technology
  • Over 35 million life tested by finger touches
  • High touch resolution ·
  • Pressure sensitive, works with any stylus ·
  • Not affected by dirt, dust, water, or light ·
  • Affordable touchscreen technology
  • High touch resolution
  • Pressure sensitive, works with any stylus
  • Not affected by dirt, dust, water, or light
  • High touch resolution
  • High image clarity
  • Not affected by dirt, grease, moisture.
  • High touch resolution
  • Highest image clarity·
  • All glass panel, no coatings or layers that can wear out or damage
Disadvantages
  • 80 % clarity
  • Resistive layers can be damaged by a sharp object.
  • 80 % clarity
  • Resistive layers can be damaged by a sharp object. ·
  • Less durable then 5-Wire Resistive technology
  • 3 million-touch life max.·
  • Less Accurate Over Time
  • 80 % clarity ·
  • Resistive layers can be damaged by a sharp object.·
  • Less durable then 5-Wire Resistive technology·
  • 3 million-touch life max.
  • Less Accurate Over Time
  • Must be touched by finger, will not work with any non-conductive input
  • Must be touched by finger, gloved hand, or soft-tip stylus. Something hard like a pen won't work
  • Not completely sealable, can be affected by large amounts of dirt, dust, and / or water in the environment.
Applications Resistive screens are very durable and can be used in a variety of environments. This type of screen is recommended for demanding point-of-sale systems, restaurant systems, industrial controls, and other workplace applications. Resistive screens are recommended for individual, home, school, or office use, or less demanding point-of-sale systems, restaurant systems, etc. Resistive screens are recommended for individual, home, school, or office use, or less demanding point-of-sale systems, restaurant systems, etc. Capacitive type touch screens are very durable, and have a high clarity. They are used in a wide range of applications, from restaurant and POS use to industrial controls and information kiosks SAW Touchscreen is all glass there are no layers that can be worn, giving this technology the highest durability factor and also the highest clarity. This technology is recommended for public information kiosks, computer based training, or other high traffic indoor environments.

 

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