DN Staff

July 2, 2001

1 Min Read
Emissive LCD

To make liquid crystal displays brighter, more energy-efficient, and easier-to-see, this display architecture uses phosphor materials instead of filters. The basic idea is to turn what is a transmissive or transflective display into an emissive one-that is to use an active or passive matrix LCD display to activate a photoluminescent display screen that offers better color purity, a wider viewing angle, and reduced power consumption.

This new display architecture is available for license and is targeted at applications where improved display visibility and power efficiency are important.

Two approaches can be used to backlight such a display: near-ultraviolet that stimulates an emissive screen composed of green, red, and blue phosphors; and monochrome (blue) that stimulates green and red phosphors only. While the near-UV allows using standard phosphors, it comes at the expense of operating life. The monochrome blue approach overcomes the UV degradation issue, but requires more expensive red and green phosphor materials.

Tony Cupolo, Perimeter Technology Inc., Tel: (404) 668-4665; E-mail: tcupolo@ perimetertech.com.

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