Chassis Plans CPX2-173, Technical Reference, Page: 8 / 54

Chassis Plans CPX2-173 Technical Reference Chapter 1 - Introduction
Page 2
LCD Enhancements
Chassis Plans starts with Grade A Industrial Quality LCD panels selected for optical performance, high reliability
and long product life cycle. In order to not only ruggedize the LCD, but to also enhance the mechanical, optical
and EMI properties of the finished unit, as an option, Chassis Plans optically bonds one 3mm anti-reflective or
two layers of coated 1.1 mm soda-lime float glass to the front of the LCD panel. The first layer is coated with an
Indium Tin Oxide (ITO) coating with a surface resistivity of <13.5 ohms/sq. See Figure 1 for attenuation values.
Figure 1 – EMI Shielding Effectiveness of ITO Coating
There is a Copper conductive buss bar that wraps around the edge of the glass to facilitate conduction from the
ITO coating to the front surface of the laminated structure to make a complete electrical shield around the face of
the LCD. See Figure 2 for details.
Figure 2 – Optical Stack on LCD
The second layer of glass is coated with an Oleophobic Anti-Reflective (AR) coating which matches the index of
refraction of air to eliminate surface reflections. These layers of coated glass are bonded together with an index
matching optical adhesive to eliminate internal reflections caused by the index of refraction mismatch between
the soda lime glass and air. This eliminates over 95% of unwanted glare from the screen. Please see Figure 3
below for more details.
20
25
30
35
40
45
50
30 MHz 75 MHz 100 MHz 150 MHz 200 MHz 300 MHz 500 MHz 700 MHz 1000 MHz
15" LCD
17" LCD
19" LCD
A R C o a tin g
IT O C o a tin g
S o d a L im e F lo a t G la s s
C o p p e r B u s s B a r
L C D F ra m e
O p tic a l In d e x
M a tc h in g
A d h e s iv e
L C D P a n e l
A n d
B a c k lig h t