Chassis Plans CCXR-17 Technical Reference
Chapter 1 - Introduction
Page 15
Figure 4 – Comparison of Reflections with and without Optical Bonding
The resulting structure has greatly enhanced optical characteristics in high ambient light conditions. The optical
adhesive used is a silicone RTV and offers other benefits mechanically to the LCD as well. The adhesive
remains pliable and therefore acts as a shock absorbing medium for the front of the LCD. Together with the
additional layers of glass provides a very rugged composite structure. Another benefit is that should breakage
actually occur the shards of glass will be retained together to prevent injury to personnel. The adhesive also
prevents any condensation from building up in the air gap between the layers of glass which would cause
fogging of the display. Finally, the added mass bonded to the front of the LCD display adds a thermal
conduction path to help dissipate the heat generated in the backlights themselves.
By eliminating the majority of reflected light, the apparent contrast improves making the display more readable in
high bright situations. An alternative to improving the contrast is to increase the back light levels to overpower
the reflected light. The downside to this approach is the higher power requirements and higher heat generated
by the backlights.
Photo Courtesy of
GDS Clearview
Figure 5 – Comparison with and without Optical Bonding
Reflected
Light
Total
22.5%
4.5%
4.5%
4.5%
4.5%
4.5%
Without Optical Bonding
Or AR Coating
Reflected
Light
Total
0.7%
0.3%
With Optical Bonding
And AR Coating
0.1%
0.1%
0.1%
0.1%
