Would like to find white SMD LEDs suitable for use as backlight for LCD monitors where the CCFL lamps have burned out. So need is for consistency between units and... well, "whiteness". ;-)
Or other parameters I should be considering?
Any recommendations (ie, LEDs you think would be good for this)?
I'm going to be doing this in about a week when the parts arrive.
Plenty more found with Google.
You should consider disclosing the maker and model of LCD monitor you're modifying.
You're going to have problems with getting consistent white. The color will NOT be the same as CCFL, but close enough to be useful. The better LCD backlit TV's use individual colored LED's, with a optical filter/phototransistor combination to adjust the intensity of each until it looks white. What happens is that different color LED's fade at different rates. Without feedback, the backlighting would slowly turn red/orange.
Nope. No maker and model number, no specifics.
The key words are "led strip light" and "CCFL replacement".
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I take it you will replace the 2mm or so diameter CCFL with a line of LEDs . The tube is uniform illumination along its length, how will you avoid stripiness of illumination? It is very sophisticated dispersion sheets backing the display to make sure no graduation of illumination across the width of those sheets.
I really have no help for the question asked, but I think people interested in the subject may have an answer to one of my questions.
I have a relatively new Samsung LCD monitor using LED back lighting. When the computer is not providing a signal, such as waking from sleep, I see a speckling or snow rather than steady background light. I have two competing explanations.
The LED light is sufficiently spatially coherent to generate "laser speckle." For example, you can see colored speckle in your fingernail when illuminated by the sun. At one time I saw laser speckle from a noble gas laser providing a mixture of lines that gave white looking light.
With no signal, the noise in the video line was amplified in the monitor circuitry. The display was presenting this as a fine churning snow. When the computer finally was sending a signal, the pixels were either fully on or fully off.
Does anyone have bette insight on this matter than I do?
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Sam
Conservatives are against Darwinism but for natural selection.
Liberals are for Darwinism but totally against any selection.
Most white LEDs are phosphor-based but hardy as bi-chromatic as you make them sound. The little Cree in my pocket flashlight has the typical broad peak around 450 nm and valley around 485 but it's quite continuous down to 650, tailing off at about 670. Very different from the narrow, discrete lines from a CCFL.
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