[Tian]

896 leds,20ma,3.3v,12000-15000mcd,32*28 leds,with 12-15v dc power source,a cpu fans.
lcd:8.4 inches,toshiba,800*600 tft.
cost list(chinese RMB,1us$=8.1 RMB)
lcd with control panel:780
1000 pcs leds:350
PCB board:20
12-15v DC power:100
lense:320mm,dia.:67mm 160
fenier? lense(I can't say it in English):330mm,60

I am a Chinese,I hate me,when a learn English,I uasully sleep.I don't think someday I must say it.I am very sorry for my poor English.

no more words I can say,see pictures please.

[Tian]

the led board

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•  001.JPG (49.45K)
  Number of downloads: 306

This post has been edited by Tian: 15 December 2005 - 04:44 PM

[Tian]

led board in a wood box

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•  002.JPG (66.6K)
  Number of downloads: 216

[Tian]

led board in a wood box

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•  003.JPG (75.82K)
  Number of downloads: 533

[Tian]

it works

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•  004.jpg (77.27K)
  Number of downloads: 585

[Tian]

60 inches blue result picture
you can see more pictures at: http://diy2005.aa.to...d=44145&fpage=1

Attached File(s)

•  P1080405.JPG (42.88K)
  Number of downloads: 454

[Tian]

60 inches result picture
you can see all 42 pictures at : http://diy2005.aa.to...d=53643&fpage=1

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•  005.jpg (50.01K)
  Number of downloads: 512

This post has been edited by Tian: 15 December 2005 - 05:05 PM

[joecnc2006]

Tian, on Dec 15 2005, 10:59 AM, said:

60 inches blue result picture
you can see more pictures at: http://diy2005.aa.to...d=44145&fpage=1

Is the wave effect in this shot (Post #6) from the led's or from the camera used?

Joe

[SupraGuy]

Looks like there's 2 issues there. A bit of unevenness in lighting from the LEDs and also some from what appears to be the screen.

Without seeing the screen in "normal" lighting, it's hard to tell exactly how much of what is from what.

[Tian]

joe2000chevy, on Dec 15 2005, 05:08 PM, said:

Is the wave effect in this shot (Post #6) from the led's or from the camera used?

Joe

the bad pictuers is my first led board with 192leds,the better one is 896leds board i use now.

[eudaimonia]

Scrolled through most of the pics he has posted in the link he gave and the wave effect definitely doesn't appear to be a factor. Maybe it is just noticeable when the screen is a solid color? Maybe it is only being picked up by the camera? It actually looks pretty good and at just 60" it is reasonably viewable under ambient light (at least "bar room" quality anyway). There does seem to be a color issue, in the reds in particular. Blues look great. Blacks are decent. Green is good. Yellow may be a bit muted, but reds are definitely lacking- they're almost brown really. Maybe this can be adjusted/compensated with the lcd controls?

Anyway, nice job Tian. Definitely shows a good result with led lighting. I might even try it myself if I could find 900 leds for a reasonable price (say, $100)...not likely in the states...I've seen 6x6 arrays (36 total leds) selling for about $20. That would make your array cost $500 here...ouch...

[Tian]

SupraGuy, on Dec 15 2005, 05:21 PM, said:

Looks like there's 2 issues there. A bit of unevenness in lighting from the LEDs and also some from what appears to be the screen.

Without seeing the screen in "normal" lighting, it's hard to tell exactly how much of what is from what.

this picture is under 25w old lights and 2*7w new lights(I can't say them in English)

Attached File(s)

•  006.jpg (93.74K)
  Number of downloads: 348

This post has been edited by Tian: 15 December 2005 - 05:40 PM

[SupraGuy]

Yeah, in that picture you can see some wrinkles in the screen, which can be seen in the blue projection.

The LEDs seem to produce slightly uneven light. Still looks better than I thought that it would.

[Tian]

hi everyone,it is 0:51 at china,sorry I goto bed, sleep now.
I will do my best to answer your question tomorrow.

[pulsareus]

Can anyone source some LEDs for a project like this? The cheapest I can find them is about a buck a piece or 100/$40 on eBay.

Building the PCB to hold the LEDs would be a simple matter with our CNC machines.

[Mongals]

放映机看起来好从图片, 但您会采取有些, 或许一些从DVD 吗?

[joecnc2006]

pulsareus, on Dec 15 2005, 05:39 PM, said:

Can anyone source some LEDs for a project like this? The cheapest I can find them is about a buck a piece or 100/$40 on eBay.

Building the PCB to hold the LEDs would be a simple matter with our CNC machines.

He posted this link before. 1,000 for 60 dollars

http://www.besthongk...5c6ed6ad0c706d6

Joe

[brainchild]

joe2000chevy, on Dec 15 2005, 07:41 PM, said:

He posted this link before. 1,000 for 60 dollars

http://www.besthongk...5c6ed6ad0c706d6

Joe

Those LEDs are 10,000k color. Most would consider that very blue.

[Tian]

pulsareus, on Dec 15 2005, 11:39 PM, said:

Can anyone source some LEDs for a project like this? The cheapest I can find them is about a buck a piece or 100/$40 on eBay.

Building the PCB to hold the LEDs would be a simple matter with our CNC machines.

we found a factory to make the prebuild led boards,we sale it in china now,and we want to sale this led board in ebay for everyone in the earth,after we test it more than one month,at about january 2006.
the price is 139us$,include:
1.prebuild led board with 896leds
2.12-16v,5A DC power.
3.other 50 same leds for free
4.other 25resisters for free
5.a small slience fans for this led boards

the leds we use is:3.3v,20ma,25-30 degree,12000-15000mcd,7000K,5mm.

139us$ not include mail cost,you pay it by youself.
if we sale it in ebay,we will give the link.
thks,everyone.

This post has been edited by Tian: 16 December 2005 - 04:09 AM

[Unwin]

Can we see some pictures using your LED projector to show how crisp the projected image is?

[zedrik]

yah...can we see some results..

[Tian]

zedrik, on Dec 16 2005, 06:48 AM, said:

yah...can we see some results..

this result picture is 100 inches(16:9),use this led board at 55watts,by my companion "carpow".
he and i make this 896leds board togather,we know each other in internet,his city and my city more than 1000 miles distance. ,now I don't know carpow is a male or a female,we contact all in internet.

Attached File(s)

•  007.JPG (61.11K)
  Number of downloads: 642

[Tian]

zedrik, on Dec 16 2005, 06:48 AM, said:

yah...can we see some results..

zedrik,are you from hongkong?if you can read chinese,please visit:
http://www.jd-bbs.co...page%3D1&page=1
you can see how i and carpow make this 896leds board from a 192leds board step by step.
by the help of more than 100 persons from whole china in internet,we just can did it successful.

[mikelish]

That is pretty amazing

[GadgetSmith]

Is the 896LED board being used with the same 8.4" LCD ? If no, how large is the LED array ?

Any plans to make one for a 15" or 17" LCD ?

Is there a possbility of sourcing LED's in the 6000-6500°K range ?

From the photo you posted, it certainly looks like corner brightness is very much improved. Nice work... keep it up.


Thanks for the info,
gs