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News

Optically bonded capacitive touchscreen display reads in bright sunlight

Juniper Systems : 19 November, 2013  (New Product)
Juniper Systems' newest rugged handheld computer, the Archer 2, has an extraordinarily bright, crisp IllumiView display. The Archer 2 is aimed at a wide variety of data collection purposes including geomatics, natural resources, public works, agriculture, industrial, and military markets.
Optically bonded capacitive touchscreen display reads in bright sunlight
In designing the Archer 2, Juniper Systems found that customers’ most important need was a high-quality display that was easily readable in direct sunlight. The company diverged from past tradition and switched from a resistive touchscreen to a capacitive touchscreen. While there are advantages to both types, capacitive technology has superior luminance and clarity, even allowing for 20% greater display brightness over resistive touchscreens. Optical bonding is used to fuse the touchscreen to the display. 
 
Most rugged handheld displays have an “air gap” between the touchscreen and the display which allows for light refraction, and thereby decreases the display’s brightness and clarity. In contrast, optical bonding involves attaching the touchscreen directly onto the display, eliminating the air gap, and consequently increasing the display’s brightness and image clarity. 
 
 
Optical bonding is not often used in the rugged handheld industry due to the fact that it is more expensive, and fewer manufacturers use capacitive touchscreens. To optically bond the display, a cleanroom was needed to keep out any dust and particles from the bonding process. A new machine lays a very even amount of glue across the surface of the touchscreen, which is then be glued to the display. 
 
Overall, optical bonding can increase the luminance of a display by about 15% over a non-optically bonded display.
 
Edited by Andy Pye
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