Backlights
"A backlight is a form of illumination used in liquid crystal displays (LCDs). As LCDs do not produce light themselves (unlike for example Cathode ray tube (CRT) displays), they need illumination (ambient light or a special light source) to produce a visible image. Backlights illuminate the LCD from the side or back of the display panel, unlike frontlights, which are placed in front of the LCD. Backlights are used in small displays to increase readability in low light conditions, and in computer displays and LCD televisions to produce light in a manner similar to a CRT display. " (Wikipedia, Backlights, 3/6/2011)
A light guide plate is one of the optical members to be used in a backlight unit for any one of various display apparatuses. (Ishikawa, US Patent 7,820,778; 10/26/2010)
Applications
Electrical Applications
Electronic Displays
Liquid Crystal Displays
Recent US Patents
10/26/2010
7,820,778
Light guide member and illumination unit
Ishikawa et al of Idemitsu Kosan, Japan has developed a polycarbonate for thin light guide plate based on a copolymer from a mixture of bisphenol A and bishphenol M. The ratio of bisphenol M to bisphenol A ranges from 1:99 to 50:50.(RDC 2/18/2011)