Light Emitting Devices, organic and novel Message Board

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Technology Stocks : Light Emitting Devices, organic and novel

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To: unclewest who wrote (118)	1/27/2000 10:41:00 PM
From: John Finley	Read Replies (2) of 330

That "white" light LED flashlight is blueish, I'd say. Interesting patent dealing with using LEDs as LCD backlights. 164.195.100.11 Light Emitting Diode planar light source with blue light or ultraviolet ray-emitting luminescent crystal with optional UV filter Abstract LED planar light source which introduces blue light or ultra violet rays emitted from luminescent crystals to a light conductive plate from its side surface. After being scattered and diffused by the light conductive plate and reflected from a reflection layer, the incident light and the excited light from a fluorescent pigment layer are mixed and synthesized to form white light or light of another specific wave length. Such a planar light source can be utilized as a back light source for a LCD. I guess I didn't know that the typical technology was: Miniature tubular cold cathode fluorescent lamp (CCFL) with a diameter of about 2 mm, incorporation a light conductive plate and a reflection layer for diffusing the light. Its lifetime is about 10,000 hours. It is disadvantageous in that a high voltage and frequency are necessary to drive it. Learn something new every day! JF

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