LED Backlight

This is the place for any magazine-related discussions that don't fit in any of the column discussion boards below.
Post Reply
JPKNHTP
Posts: 488
Joined: Wed Jun 29, 2005 1:01 am
Location: Missouri
Contact:

LED Backlight

Post by JPKNHTP » Thu Dec 01, 2005 4:42 am

-JPKNHTP
-God Bless

rshayes
Posts: 1286
Joined: Tue Mar 04, 2003 1:01 am
Contact:

Re: LED Backlight

Post by rshayes » Thu Dec 01, 2005 6:42 am

Most LCD displays use a plastic "light pipe" to transfer the light from a cold cathode fluorescent tube to the back of the display. The light pipe is basically a sheet of plastic with the light injected through one or two edges. Since your LEDs are already concentrating the light into a small area, it should be possible to use a light pipe to distribute the light uniformly across the display area without modifying the LEDs.

By definition, the brightness of the backlit display will be lower. You are basically taking the same amount of light and spreading it over a much larger area.

JPKNHTP
Posts: 488
Joined: Wed Jun 29, 2005 1:01 am
Location: Missouri
Contact:

Re: LED Backlight

Post by JPKNHTP » Thu Dec 01, 2005 8:26 am

-JPKNHTP
-God Bless

User avatar
Chris Smith
Posts: 4325
Joined: Tue Dec 04, 2001 1:01 am
Location: Bieber Ca.

Re: LED Backlight

Post by Chris Smith » Thu Dec 01, 2005 8:34 am

Optics can spread the LED over a large area. The hard part is finding microscope or telescope eye piece lens to disassemble that is surplus or for sale at the right price. Childrens toy telescopes are the best place to start.

A 8MM eye piece lens out of a telescope or microscope is just a tiny bit larger than the led, so space isnt the issue, and it should throw a large beam [still circular] depending on its placment.

Post Reply

Who is online

Users browsing this forum: Bing [Bot], Google [Bot] and 35 guests