EmiClare H
- EMI EMC Transparent Heater Window
An
EmiClare emi emc window with a heating circuit for defrosting and/or
maintaining LCD's at 10-20'C for optimum screen response. Emiclare EMI
mesh provides the EMI attenuation and ITO coating provides the heater
element
EmiClare®H
windows are available in glass with VRD140 non glare or Anti-Reflective
coating on the front surface. The ITO heater surface is located on the
back surface or inside the laminate for environmental protection.
General
The screen
response of many new liquid crystal displays is temperature dependent and
if the operating environment for these displays falls below 10'C and in
some cases below 20'C a significant change in response time occurs.
Visiontek Systems Ltd have developed a laminated emi window which
incorporates our proprietary EmiClare mesh technology with an ITO heater
circuit. The result is a high light transmission emi/heated window with
excellent broad band emi characteristics.
In addition to its basic function this window design offers outstanding
mechanical and impact resistant properties which makes it suitable for use
in a variety of "rugged" environments. The ITO heating surface
can also be located within the laminate to protect it from environmental
damage in harsh environments.
Extensive alpha site testing on a military application have qualified this
window design as a defrost and heater unit able to maintain 20'C +/- 2'C
at the LCD with an outside temperature of -50'C and over temperature
gradients of 3'C/minute.
Typical
EMI shielding characteristics.
| Electric
Field |
| Freq.(MHz) |
1 |
2 |
4 |
7 |
10 |
|
| Atten.
(dB) |
70 |
68 |
68 |
68 |
65 |
|
| Electric
Field |
| Freq.(MHz) |
20 |
50 |
100 |
200 |
500 |
1000 |
| Atten.
(dB) |
50 |
63 |
70 |
68 |
62 |
55 |
Specification
| Maximum
size |
|
|
Heating
element |
300
x 400mm |
|
Front
glass |
400
x 600mm |
| Minimum
thickness |
4.3
- 4.5mm |
| Emi
Shielding |
|
|
ITO
coating on glass |
13-16
ohms/square |
EmiClare
GP70 mesh
| Emi
termination |
|
Silver
busbar to the inside flat surface of the step |
|
Extended
mesh wrapped over a sponge gasket |
| Heater
element |
|
ITO
coating on glass 13-16 ohms/square |
Heater
Termination
Busbar on the two horizontal edges. An equipment wire is soldered to the
busbar and the complete termination encapsulated in a glass cloth
insulating tape.
| Temperature
range |
-40'C
to +75'C |
For product
performance information, please contact VisionTek Systems Ltd.
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