Frontlight
A frontlight is a means of
An LCD presents an image by absorbing some light passing through it. When an electric field is applied across the crystal, it changes the passing light so it will not pass through a polarization filter. This allows LCDs to operate at low power, as no energy needs to be spent generating light. Many battery-operated electronic devices, including most calculators and other devices use unilluminated LCDs.
An unilluminated LCD must be lit from the front. To use ambient light, the liquid crystal itself is sandwiched between a polarization filter and a reflective surface. The mirror makes the display opaque so it cannot be illuminated from the back. Most often a light source is placed around the perimeter of the LCD.
Frontlights are relatively uncommon.
Devices using a frontlight
- GP32 FLU (2002)
- Game Boy Advance SP (2003) (Only the AGS-001 model, not the AGS-101 model)
- Kindle Paperwhite(2013)
See also
- LCD
- Backlight
References
- ^ "FLEx Front Light for Reflective LCDs". LEDs Magazine. June 26, 2018. Retrieved February 20, 2024.