I'm interested in building, but have some questions regarding the specs on LCD screens.
Video is 30 fps, so the maximum response time to consider for them LCD should be no more than 30ms. What are the results like from currently built projectors? What response times are on the LCD's in use and what amount of ghosting (if any) is noticable? What size of LCD's are commonly being used?
What is an average contrast ratio in use and how rich are the colours? How deep are the blacks?
If planning on using the prpjector mainly with a DVD player and a video converter (component to RGB), is more than 800x600 needed?
Any other comments are appreciated.
Video is 30 fps, so the maximum response time to consider for them LCD should be no more than 30ms. What are the results like from currently built projectors? What response times are on the LCD's in use and what amount of ghosting (if any) is noticable? What size of LCD's are commonly being used?
What is an average contrast ratio in use and how rich are the colours? How deep are the blacks?
If planning on using the prpjector mainly with a DVD player and a video converter (component to RGB), is more than 800x600 needed?
Any other comments are appreciated.
Hmm... depending on the source and the scaler, upto 60 fps can be achieved on NTSC.
About the resolution. If you use your computer as the dvd player, on a 4:3 LCD, the maximum resolution you will need is 720x770, that would be in the case of anamorphic PAL dvds. So that ends up at a standard 1024x768. For anamorphic NTSC dvds, 800x600 will do just fine. Dont forget that the higher the resolution, the less screendoor/pixelization!
About the resolution. If you use your computer as the dvd player, on a 4:3 LCD, the maximum resolution you will need is 720x770, that would be in the case of anamorphic PAL dvds. So that ends up at a standard 1024x768. For anamorphic NTSC dvds, 800x600 will do just fine. Dont forget that the higher the resolution, the less screendoor/pixelization!
Bad lcd (I think)
On an impulse I recently purchased a 5.6" lcd monitor off ebay. It's called a "Sharper 44" and made by a company that I think is called "Sharper Vision" in China.
Well it arrived today and I am not happy. The thing was not packed properly, they just tossed it in a larger box with no packing around it at all. When I opened it and removed the protective film from the display area I noticed that the upper right hand corner was nor the same color as the rest. When I powered it up I saw that that discolored area was displaying nothing and from that area over to the left the image was distorted, curving over to the left at the top.
Aside from the obvious damage or factory defect, the color does not seem adequate even for watching TV at that small size. It looks similar to what you get when you view a high/natural image with only 256 colors. I think this is the limit of the display and not from damage but will not know until I get a replacement for it from the vendor. I think I just made a foolish impulse buy and screwed myself.
I would suggest that no one buys one of these until I can follow up with more info. I should have asked the color capability before I purchased it but thought it would have to be good enough if it was going to be a TV. Maybe the lcd itself was intended for a less intensive use.
Oh well, you live and learn but unfortunately you get in trouble if you chop people up with an ax.
On an impulse I recently purchased a 5.6" lcd monitor off ebay. It's called a "Sharper 44" and made by a company that I think is called "Sharper Vision" in China.
Well it arrived today and I am not happy. The thing was not packed properly, they just tossed it in a larger box with no packing around it at all. When I opened it and removed the protective film from the display area I noticed that the upper right hand corner was nor the same color as the rest. When I powered it up I saw that that discolored area was displaying nothing and from that area over to the left the image was distorted, curving over to the left at the top.
Aside from the obvious damage or factory defect, the color does not seem adequate even for watching TV at that small size. It looks similar to what you get when you view a high/natural image with only 256 colors. I think this is the limit of the display and not from damage but will not know until I get a replacement for it from the vendor. I think I just made a foolish impulse buy and screwed myself.
I would suggest that no one buys one of these until I can follow up with more info. I should have asked the color capability before I purchased it but thought it would have to be good enough if it was going to be a TV. Maybe the lcd itself was intended for a less intensive use.
Oh well, you live and learn but unfortunately you get in trouble if you chop people up with an ax.
You have full right to get money refund if item is damaged/broken in shipping, if seller refuses, dial 911.
I just wanna to say,
that VGA ( 640x480) is normally ok for DVD watching.
And on the projection panels, the reaction time of 30-40 ms is totally ok, you never see a blur (just look to get a Spectra C or z-Series.., just read here, you get the information).
Bernhard
that VGA ( 640x480) is normally ok for DVD watching.
And on the projection panels, the reaction time of 30-40 ms is totally ok, you never see a blur (just look to get a Spectra C or z-Series.., just read here, you get the information).
Bernhard
Suggestions for small lcd anyone?
Well I got a quick reply from the company I bought that crappy display from and return for replacement or refund is no problem. Got an apology too. He said that the packaging in the small box was usually enough, but I think that if thats so they should have shipped it in the small box only and not put it in another one to bounce around in.
So does any one have a suggestion for a small lcd, preferably 7" or less that doesn't cost a lot? I'm trying to go cheap on this first project since it's as much a learning experience as anything else. (I need lotsa learnin)
Those tiny 1.8" lilliputs seem to have the same resolution as the 5.6" displays that are going cheap, but I'm not sure that they're very easy to disassemble. The "light engine" if you want to call it that isn't that powerfull so I don't plan on projecting a very large image, may even go the rear projection route if I can find the right mirrors.
thanks
Well I got a quick reply from the company I bought that crappy display from and return for replacement or refund is no problem. Got an apology too. He said that the packaging in the small box was usually enough, but I think that if thats so they should have shipped it in the small box only and not put it in another one to bounce around in.
So does any one have a suggestion for a small lcd, preferably 7" or less that doesn't cost a lot? I'm trying to go cheap on this first project since it's as much a learning experience as anything else. (I need lotsa learnin)
Those tiny 1.8" lilliputs seem to have the same resolution as the 5.6" displays that are going cheap, but I'm not sure that they're very easy to disassemble. The "light engine" if you want to call it that isn't that powerfull so I don't plan on projecting a very large image, may even go the rear projection route if I can find the right mirrors.
thanks
well depending on your budget I purchased an Innovatek 007VG for $235 CDN shipped. Its essentailly the same as the Lilliput VGA. I ran XBOX in 480P on this LCD and the quality was amazing.
Specs...
Resolution 2400*480
High Resolution 1600 x 1200
Supported Resolution 640 x 480 ~ 1600 x 1200
Physical Resolution 800 (H) x 480 (V)
Dot Resolution 2400 x 480 = 1,152,000 (dots)
3 AV RCA Video + 1 VGA input
Specs...
Resolution 2400*480
High Resolution 1600 x 1200
Supported Resolution 640 x 480 ~ 1600 x 1200
Physical Resolution 800 (H) x 480 (V)
Dot Resolution 2400 x 480 = 1,152,000 (dots)
3 AV RCA Video + 1 VGA input
INNOVATEK
Yeah I've just been looking at these on ebay, and there's another brand with onboard tv tuner. I think I'm going to wait for a little while unless I see one very cheap. I "won" a portable vcr with 5.6" LCD onboard for $9.99 (20 to ship though) and am going to build my first one with that one. I'm pretty sure that 8" is about the max that the triplet lens I bought will handle comfortably. I also got an old "Boxlight Revolution 3000" projector that is almost working. I'm hoping that even if I can't get it working properly I can rob it for parts. 240W MH lamp setup. That would definately save me some money unless the replacement lamp is nutso priced. Anyway thank you for the info, I need all the help I can get.
Yeah I've just been looking at these on ebay, and there's another brand with onboard tv tuner. I think I'm going to wait for a little while unless I see one very cheap. I "won" a portable vcr with 5.6" LCD onboard for $9.99 (20 to ship though) and am going to build my first one with that one. I'm pretty sure that 8" is about the max that the triplet lens I bought will handle comfortably. I also got an old "Boxlight Revolution 3000" projector that is almost working. I'm hoping that even if I can't get it working properly I can rob it for parts. 240W MH lamp setup. That would definately save me some money unless the replacement lamp is nutso priced. Anyway thank you for the info, I need all the help I can get.
lcd panels from ebay
Has anyone had much luck with buying lcd monitors off of ebay? I've been trying to buy several, but the prices tend to go up too high. I've noticed that the price on ebay tends to be about 2/3 to 3/4 of the cost of new. If factor in the cost of shipping, it's the same as new.
Has anyone had much luck with buying lcd monitors off of ebay? I've been trying to buy several, but the prices tend to go up too high. I've noticed that the price on ebay tends to be about 2/3 to 3/4 of the cost of new. If factor in the cost of shipping, it's the same as new.
LCD monitors on eBay
Same experience here. The people bidding don't know what the discount & computer store prices are, or they would not go so high. I tried bidding on some refurb'ed monitors, but their final prices were more than I could get them for new! I finally gave up and bought a 15" monitor for $200 after the rebate from a local computer store. Now I see 17" with very nice specs for under $200. Look around for discount stores with sales and rebates.
Small LCDs are much more difficult. Many are sold as having 3x the real resolution because they count each red, green, or blue dot as a pixel. Many are very low resolution and/or low color depth. Be careful!
Same experience here. The people bidding don't know what the discount & computer store prices are, or they would not go so high. I tried bidding on some refurb'ed monitors, but their final prices were more than I could get them for new! I finally gave up and bought a 15" monitor for $200 after the rebate from a local computer store. Now I see 17" with very nice specs for under $200. Look around for discount stores with sales and rebates.
Small LCDs are much more difficult. Many are sold as having 3x the real resolution because they count each red, green, or blue dot as a pixel. Many are very low resolution and/or low color depth. Be careful!
Pixels dots and sub-pixels
The way the resolution of the small monitors is confusing to say the least. Not as much the translating of it into true resolution, (although that is difficult enough for someone as dimwitted as myself) as the fact that they are getting away with it. I don't see how they can be advertising these monitors as having x amount of pixels when it's actually dots or sub-pixels. Are they only selling this way on ebay? Do their contries of origin allow false advertising? Do they define these terms differently? If companies were selling monitors described as being 30 inches and when you purchased it it turned out to bo 30 centimeters they would shortly have to change their advertising. They might get away with it the first few times claiming it was a mistake, but not for as long as this.
The way the resolution of the small monitors is confusing to say the least. Not as much the translating of it into true resolution, (although that is difficult enough for someone as dimwitted as myself) as the fact that they are getting away with it. I don't see how they can be advertising these monitors as having x amount of pixels when it's actually dots or sub-pixels. Are they only selling this way on ebay? Do their contries of origin allow false advertising? Do they define these terms differently? If companies were selling monitors described as being 30 inches and when you purchased it it turned out to bo 30 centimeters they would shortly have to change their advertising. They might get away with it the first few times claiming it was a mistake, but not for as long as this.
contrast ratio/response time
How important is contrast ratio? I know it's the ratio of of light from total black to total white, but at what point does the ratio become not acceptable? I would think that 400:1 would be decent, 100:1 to be poor, and 800:1 would be excellant.
At what point does the response time become noticable on the display? Ghosting, etc. 25ms should be good.
comments?
How important is contrast ratio? I know it's the ratio of of light from total black to total white, but at what point does the ratio become not acceptable? I would think that 400:1 would be decent, 100:1 to be poor, and 800:1 would be excellant.
At what point does the response time become noticable on the display? Ghosting, etc. 25ms should be good.
comments?
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