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Author Topic: So, who has succesfully used LED backlights thus far?  (Read 11182 times)
Thanatus
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« on: March 06, 2008, 01:44:22 PM »

When I go through with this I want to make sure I do it right, and that means LED backlighting.

With the right LEDs it's possible to get a huge colour reproduction and brightness benefit. Unfotunately only professional models have LED so they won't be in the dumpster for me to scavenge, which means I have to make my own, which seems feasible as long as I have: "warm" white LEDs, resistors, reflectors to spread the light, power supply, and probably a cooling fan.

Which entails a custom housing, oh bother... but Rumi's Samtiq is very encouraging in that regard.

So who's successfully managed a custom LED setup?
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Switz
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« Reply #1 on: March 06, 2008, 07:32:25 PM »

I am using now.
My first led test WITH the lcd was last night.
Wait for the weekend, I will do more tests, etc.
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Drewid
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« Reply #2 on: March 06, 2008, 07:40:22 PM »

Chems and tenassi as well.
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Thanatus
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« Reply #3 on: March 06, 2008, 08:04:29 PM »

I am using now.
My first led test WITH the lcd was last night.
Wait for the weekend, I will do more tests, etc.


(Rubs hands eagerly)

If you have problems I'd suggest you use as much diffusion as possible and maybe try a mirror behind the LEDs, sounds weird but I heard they need that.


Chems and tenassi as well.

Good to know.
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Switz
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« Reply #4 on: March 06, 2008, 08:52:56 PM »

Problem with mirror.


Probably going to easily get scratched and it will be kind of thick, even a fs mirror.
Also, mirrors usually have reflective metallic coating which may cause interference.
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Rayall
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« Reply #5 on: March 06, 2008, 09:12:39 PM »

Okay, I'm an artist, I'm not sure why you ned the LED back lighting. Does anybody have a simple answer?  Huh Embarrassed  Cheesy
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Switz
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« Reply #6 on: March 06, 2008, 09:18:35 PM »

I bought an lcd with a busted inverter.  Thats my reason.

But many people like it, as it uses less power, causes 0 interference, and... muuuuch less heat.

Those are the main reasons.
They last longer I believe too.
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Chems
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« Reply #7 on: March 06, 2008, 11:16:30 PM »

I didnt use LED's drew.

My build was successful, I dunno why its not in the success category. Was it cause I broke it after a couple of days of use? That was more heavy handiness than anything.


*goes to sulk
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Drewid
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« Reply #8 on: March 07, 2008, 12:00:52 AM »

cos I'm moving stuff in slowly. Wink
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Switz
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« Reply #9 on: March 07, 2008, 12:08:23 AM »

Maybe you need a bit of help?

lol just kidding.


We need that Wiki!
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Thanatus
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« Reply #10 on: March 07, 2008, 12:39:51 AM »

Okay, I'm an artist, I'm not sure why you ned the LED back lighting. Does anybody have a simple answer?  Huh Embarrassed  Cheesy

LCDs make color by filtering them out from the white light emitted by the backlight (as white light is all of the wavelengths together).

However, the standard backlights (CCFLs) on most monitors don't produce a "pure" white, so it screws with how well a monitor can display colors.
CCFL:

LED:


Bigger triangle = more colors.

I have seen the difference with my own eyes recently and it was definitely considerable. I hope that helps

The other things Switz mentioned apply as well, but that all depends on whether he can get LEDs that are bright enough and if he can get them to light the screen evenly, otherwise they're useless.
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Switz
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« Reply #11 on: March 07, 2008, 01:05:01 AM »

Good pics there.
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AndreZX
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« Reply #12 on: March 07, 2008, 03:40:05 PM »

Mine are working, but the color reproduction of my LEDs isn't as good as even the original CCFL backlight. The color they produce is weird, and there are distinct different colors visible in their beam— namely yellowish-white, blue, and green. But, I haven't found any that are as bright in the warm spectrum, so that's what I'm using.
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Thanatus
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« Reply #13 on: March 07, 2008, 09:19:57 PM »

Mine are working, but the color reproduction of my LEDs isn't as good as even the original CCFL backlight. The color they produce is weird, and there are distinct different colors visible in their beam— namely yellowish-white, blue, and green. But, I haven't found any that are as bright in the warm spectrum, so that's what I'm using.

That's something that I've feared. I've imagined that the LEDs manufacturers use are a cut above the ones typically available to us, with a more even and broad spectrum. With any inexpensive light source you'll get "jumps" at certain wavelengths like that.

If you can find the nn (nanaometer) range of an LEDs wavelengths in the specs larger is generally better, but I don't know what the optimal range for the ones used in monitors are. Maybe I can email someone at X-Bit Labs about this...
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Rayall
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« Reply #14 on: March 07, 2008, 11:20:48 PM »

I'm not sure I can use it on the iBook, I may be able to use it on the new monitor (when I can afford to buy one  Cheesy).
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