# Projecting distances and TV 3000 question

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#### SuckerFish

I looked but couldnt find any specific answers to these questions

1- Is there a formula/ratio to calculate the projected image size on a wall. (example: OHP is 14 feet away thus a 8 foot image)
How do you calculate that?

Also:

2 - People who have expirence with the Tv 3000 or tvone's other line of products.

a) Do the brightness and contact controls aid you quality of image significally?

b) From what source would you say it helped the most?
Tv, Dvd, Game Console

c) And overall how you rate its overall improvement on a scale of (1 to 10)?

As always THANKS!

PS My problems with Whaam on ebay are still not solved for those who followed my thread

#### Mario007

SuckerFish said:
I looked but couldnt find any specific answers to these questions

1- Is there a formula/ratio to calculate the projected image size on a wall. (example: OHP is 14 feet away thus a 8 foot image)
How do you calculate that?

Also:

2 - People who have expirence with the Tv 3000 or tvone's other line of products.

a) Do the brightness and contact controls aid you quality of image significally?

b) From what source would you say it helped the most?
Tv, Dvd, Game Console

c) And overall how you rate its overall improvement on a scale of (1 to 10)?

As always THANKS!

PS My problems with Whaam on ebay are still not solved for those who followed my thread

Hey sucker unfortunately the image size depends on multiple factors. Size of lcd,lens on overhead,and fresnel. There is no one size fits all formula. That I know of. I hope you get your issue with Whaam resolved.

#### SuckerFish

which projector would need to be farther to project an 8 foot image?

Using 8 inch lcd on OHP
Or using a 10 inch?

#### woneill

The bigger the panel, the bigger the image it will project at a given distance on the same OHP.

Thus, the 8" needs to be further away to project an 8 foot image.

Bill.

#### xblocker

The formula for suckerfish's question goes like this:
1/f=1/d1+1/d2, where's f = focal lenght of ojective, d1=projection image diagonal, d2= object(LCD) diagonal.

xblocker

TV-3000 review...

a) Do the brightness and contact controls aid you quality of image significally?

b) From what source would you say it helped the most?
Tv, Dvd, Game Console

c) And overall how you rate its overall improvement on a scale of (1 to 10)?

To answer some of the questions about the tv3000....the controls on the tv3000 are for brightness...contrast...saturation...hue

-What I have found is I will set my Nview Spectra C to default settings (The Reset button on the remote) and then I use the remote on my TV-3000 to work on what I want. Once I have a desired picture brightness/contrast/color, I usually do not have to adjust too much for different movies...for some movies I have had to turn the brightness down a little...or adjust my hue a little. Now for television it really depends on how good your cable feed is...for example a few of my cable channels suck in quality and look even worse on a big screen LOL....but 90% of my channels look great (ESPN, CNN, FOX, MTV, ECT)

-The tv-3000 gives you added control over brightness/contrast/color....I find it hard to rate because it is all I have used or seens pics of....but I have used tested it with windvd in my htpc setup and found that it was not quite as good. Windvd gives maybe 10% better color control and image quality...however I lost major sound quality when I went the htpc route and I choose top quality sound with a decent piture orver a better picture and sucky sound.

-to rate it...all I can say is it works and gives you added control over picture quality nothing so drastic that it is the answer for all but it works and I like it for my setup.

-sorry guys...I need to get some screen shots to show the difference with it and with out it I guess...

#### SuckerFish

Very cool!
Thanks

I will not be using a Pc at all with my setup
I have a Dukane 680 (7600 lumens) and will try it on my friends Sharp qa 1650

Do you have any screenshots of you projecting on a plain wall to see the improvement that screen gave you.

----------------------------------------------------------------------------------
In theory

Projecting an 8 foot image with:

1- an 8 inch LCD
2- an 10 inch LCD

Respecting the differences in distance from screen needed,
will the quality be the same?

Will the 10 inch LCD project a cleaner/better image because its distance is closer to the screen

Or will the quality be the same....?
More/Less pixelation?

#### Mitch

Disregard last post. Its not the same thing....

Will someone tell me the path of the video signal with this TV 3000 thingy. Is it DVD to TV-3000 to the proj. panel?

One other thing. Will the tv-3000 upgrade the resolution only as high as the panel resolution is rated? Probably a stupid question.
Thanks

#### Morien

Mitch...

Mitch,

How the connection for the TV-3000 goes is like this. The video source (ie. dvd player) plugs into the TV-3000 via composite or s-vhs. The TV-3000 then makes the changes to the video as requested and the outlays it via vga to the panel.
So simply, 'DVD-TV 3000-Proj. Panel'

The TV-3000 will double the lines to make for a cleaner image. It then will output it as 640x480 60Hz, but your panel will only show what it can. If your panel is 320x240 then it will be displayed as 320x240. If your panel is 640x480 then it will be displayed as 640x480, but if your panel is 800x600, then it will only be outputted as 640x480 Full Screen because that is the TV-3000 output resolution.

Hope this helped.

#### Morien

SuckerFish...

SuckerFish,

Gunawan made a calculation sheet a while ago to calculate the size of the outputted image. That can be seen at http://www.gwidijanto.fcpages.com/index.htm

Hope this is what you were after.

#### SuckerFish

Morien.. Thanks but I cant use those figures with an OHP setup?

The reason I ask which panel to get, of course is overall quality.

I definetely only have money for a 640x480 panel, so like I said would I be better off with an 8" or 10" screen?

Will either make a difference in quality once projecting a 8 foot screen (respecting the distance needed to get that image?)

I hope this isnt a dumb question

#### Morien

The quality of the picture depends on the resolution (ie. 640x480) and not on the size of the panel. But the bigger the panel is the larger the picture will be. For example, a 5" panel may give a projected image of 8' when it is in a certain position. But if you change that panel with a 10" one than the projected image will be 16' at the same distance from the screen. (These are not exact figures)
Think of how big you want the projected image. The bigger you want it the bigger the panel should be.
Hope this helped, and made sense.

#### SuckerFish

Morien,

I understand that concept very clearly... take this for example.

1 - OHP and 10 inch LCD panel, at X feet,projects an 8 foot image.

2 - OHP and 8 inch LCD panel, at X feet, projects an 8 foot image.

Respecting the difference needed to get the 8 foot image

And pretend the LCD panels being used are identical other than its size (resolution and inputs are alike)

Will there be any difference in image quality
They are different distances away but projecting the same size.

I guess this is a dumb question

#### Tinker

I also thought that a larger lcd gave a better image? As in a 10" compared to a 5". At 640x480 the larger one has twice as many pixles to it. This would mean it would look more defined and higher contrast at 8' projected than a 5" lcd would. But the larger requires more light aswell. If I'm wrong please explain!

#### woneill

Hi Guys,

The number of pixels on a 10" 640x480 panel is exactly the same as the number of pixels pn an 8" 640x480 panel. The pixels are bigger on the bigger panel.

As for quality - you will be more dependent on the quality of the LCD panel itself and its driver electronics than the distances.

The biggest impact panel size will have on the picture is the uniformity of the image. On the majority of OHPs, the light intensity is not uniform - it is brighter in the center, and fades towards the edges. On a bigger panel, this fading will be more noticeable than on a smaller panel. However, a bigger panel will PROBABLY produce a brighter image overall, because its pixels are bigger and more light should actually get through...

Bill.

#### Mitch

So lets say I buy one of those TV 3000 that goes from Video to VGA res., and lets say I have a panel that is rated at 640x480 (VGA) res., will this TV 3000 do me any good or would it be doing nothing since the the panel already does VGA?
Sorry if I`m being a pain in the butt.

Toodles

#### xblocker

woneill said:
On a bigger panel, this fading will be more noticeable than on a smaller panel. However, a bigger panel will PROBABLY produce a brighter image overall, because its pixels are bigger and more light should actually get through...

Not only that! A bigger panel has less heat impact/pixel, cause the light flux is distributed on a larger area. That could also be a reason why commercial single panel projectors never had small panels and never exeeded the brightness of 400 ANSI lumens!
A given light flux, concentrated on different large areas gives you different heat profiles.

xblocker

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