Electroluminescent backlight

Data sheet EL-film (eng)    Data sheet EL-film (norwegian)

Keytouch designs and manufactures front panels, membrane switches, and electro mechanical operating panels with embedded electroluminescent backlight (EL-film).

Advantages of electroluminescent backlight:

• Thickness 0.2 mm
• No heat dissipation 
• Light weight
• Flexible
• Available in White and Green  
• Light is distributed evenly on large surfaces
• Dimming available
• Luminary buttons, texts, frames, logos etc.

EL-film structure

EL-film is printed in layers onto a polyester surface composed of a layer of custom-made phosphorous situated between two electrodes. When AC-voltage is connected, an electric field is created which ignites the phosphorous particles. Operation life of the EL-film depends on on-time and inverter voltage/frequency. Optimal duration is best obtained by dimming the light, installing a light sensor to switch it off when not needed, or by time-limited activation.

Since 1997, the production process related to EL-film has undergone constant evolution. Our expertise on the area currently includes technical printing processes, chemical processes, graphic design and electronic solutions.

Inverter

Keytouch can provide an inverter to the el-film, which can also control dimming of 0-100%. The inverter circuit has integrated filter components, which makes the el-film solution pass both Maritime and Military EMC requirements. 

Screening

A layer of screening is embedded in every single EL-film construction, to prevent crosstalk; from the EL-film to other electronics.

Technical Data
Power consumption	~0.15	mA/cm2 @ 5V
Dimming	0-100%
Luminous intensity	20-25	Lux@100%
Serial reproducibility	15%	±
Wear life, 20°C / 50% RH	> 50.000	Hours
Thickness	>= 0.175	mm
Storage temperature at 30% RH	-40 - +100	°C
Application temperature at 30% RH	-40 - +85	°C