Specification: The VarTech Transparent Heaters are either unlaminated or fully laminated glass filters with an Indium Tin Oxide (ITO) coating of 12 ohms/sq. This is an optimum coating density to provide excellent heating performance with good optical clarity compared to the highly reflective thin resistive wires typically used to provide heat.

Extensive testing and military qualification has proved the VarTech transparent heater to maintain a LCD at 20'C with an outside temperature of -50'C and 3’C/minute temperature gradient.

Termination Method: Highly rugged proprietary insulated busbar and wire termination along two opposing edges.

Applications:

Transparent heaters are used in a board range of applications including: public information displays, material handling equipment, military ground based vehicles, naval flight deck equipment, control panels on heavy agricultural and earth moving equipment, periscopes and off-shore oil platforms.

Product Range:

Un-laminated glass transparent heater:
• Transmittance @ 550nm 89%
• Thickness 1.1mm only
• Plain float finish only
• Max size 400 x 500mm

Laminated glass transparent heater:
• The ITO surface is located within the    lamination for ruggedization and
   additional layers incorporated for
   mechanical & impact resistance
• Thickness 2.5mm upwards
• Finish plain, etch non-glare and
   anti-reflective coating

Additional elements for Multi-function
windows with transparent heater:
• EmiClare EMI shielding
• Contrast enhancement
• Etch non-glare and anti-reflective
   coated front surface finish
• Silk screen printing

High Transmission Thin Film LCD Heaters Available on Most LCDs

LCDs must operate in critical applications with no room for failure. The need for heaters in temperature controlled LCD displays is becoming more prevalent than ever. In order to meet this need VarTech has developed a system to add thin film heaters to most VarTech DiamondVue, Xtreme and CrystalVue displays.

Heaters are available in a variety of materials and configurations to fit your application requirements.

Key Heater features:

• High optical transparency and improved contrast
• Precise electrical resistivity
• Low reflectance
• Environmental stability
• Resists thermal shock
• Optional termination methods
  • Attached lead wire
  • Indium solder bus bar
• Rapid system startup without loss of display visibility
• Low power consumption
• Design flexibility

Spectral Characteristics

• Standard ITO Heater Coating - Nominal: 12-20 W /sq
• Tolerance: ± 20%
• Reflectance: £ 0.75% average from 425 to 675nm at 10° incidence
• Transmittance: ³ 97% average from 425 to 675nm at normal incidence, exclusive of substrate absorption and second surface reflectance
• Overall Transmittance: ³ 95% average from 425 to 675nm with second side AR (HEA®) coated
  •   ³ 91% average from 425 to 675nm with second side uncoated
• Optional HEA® Coating on second side
  • Reflectance: £ 0.6% absolute from 430 to 650nm at 10° incidence; £ 0.3% average at 10° incidence

Durable heating system meets the following requirements

• Humidity Resistance > 24 hours (MIL-C-675)
• Adhesion: Quick tape test (MIL-M-13508)
• Abrasion Resistance: > 40-rub eraser test (MIL-C-675)
• Solubility Resistance: > 24 hours immersion in NaCl solution (MIL-C-675)
• Temperature resistance: > 4 hours at -54°C to 71°C