diy projector from the Philippines

[hertzblaster]

Sent email to you r_x16

[hertzblaster]

I am confused right now. Can anybody help me?

I have a progressive scan dvd player.
I need a component video to vga converter. Best quality at lowest cost.

Here are my options

1. buy progressive component video to vga converter.. What will be my screen resoluti n? Is it 640x480 progrssive? this is the product http://www.lik-sang.com/info.php?cat...ducts_id=4233&


2. buy a component video to vga converter( input is interlace?). Will my resolution be 800x600 progressive? this is by using this converter http://www.lik-sang.com/info.php?cat...ducts_id=3235&

Now which is better? Any other product that u can recommend under $100?

[hertzblaster]

so far these are what I had learned about progressive scan dvd players. kindly comment if you feel i am incorrect.

1. I f you are currently using an interlaced CRT TV the horizontal lines alternating will be evident at close viewing. total horizontal line shown at a time is 240 lines. HDTV can show 480p meaning 480 horizontal lines at any time.

2. LCD monitor/CRT PC monitor/ plasma/projector has deinterlacer. Meaning any interlaced signal fed to them, they will convers to progressive scanning.

for LCD monitor using s-video or composite or component input, LCD will convert the interlaced signal coming from interlaced scan dvd player to progressive. But the horizontal lines is only 240 lines progressive

For lcd monitor using vga input, the signal fed to it is should alway be progressive.

Finally if i will buy a progressive component video to vga adapter, LCD will show a 480 horizontal line progressive which is what we call 480p. if a dvd players component video is interlaced, then the lcd will show 240 horizontal lines only.

My LCD has svga resolution so i need look at a converter that will up convert the dvd 480p scan to 600 horizontal lines. is this possible?

Please make comments if understand these things correctly.

BTW, with regards to chrome reflector which has bubbling. it is still performing great and much better than stainless steel reflector. Try a chrome guys and maybe discussed with the plater how they can eliminate bubbling of chrome plate at high temp. It is still very shiny, no discoloration and the mirror finish is not affected at all. I estimated that i had increase brightness from 20-30% or more. Just a guess.

Will show pics later on. I stil don't have the camera.

[hertzblaster]

Kindly comment.

Since i have a progressive scan dvd player, all I need is just a simple component to vga adapter ( no electronics needed ) just like this one
http://store.infocus.com/escalate/st...name=&tab=desc

[Hezz]

Hertz,

I would recommend driving your projector with a dedicated HTPC or using your existing computer if at all possible. You can then use the DVD player in another room with a small TV.

Otherwise you will need a component to VGA convertor that can scale to 800 x 480. This is an unusual pixel grid so I doubt if any of the cheap convertors would do it. Standard VGA resolution is 600 X 480 and if you input that signal in the Lilliput you will loose some of your resolution unless the lilliput does this automatically. My understanding is that the Lilliput comes with software drivers for windows to do the 800 X 480 pixel grid. But perhaps I am mistaken.


I have decided to build a dedicated HTPC so that I don't have to continually change VGA cable connections with my existing monitor and computer. In the long run it is more flexible as we can then upgrade to higher resolution LCD's as they become available. And they will.


Also, the simple connector will probably not work since the component output on the DVD was not designed to drive a LCD panel but a CRT. With LCD each pixel is addressed. With CRT the lines are scanned so I don't believe the simple adapter will work. Unless your DVD has the circuitry to address and scale images. This is unlikely. This is why the PC is the best most flexible and cheapest alternative.

However, I can understand why some would want the simplicity of a standalone DVD player for the projector. In this case you will have to pony up the money for a dedicated scaler but I think there are now some decent ones for under $500.

Hezz

[hertzblaster]

Thanks Hezz for that valuable information

Now i would like to share with regarding what i read from the net.

1. The progressive scan of a dvd player is better than other upscaler available. the reason given is in dvd player, conversion is done in digital domain. And a true progrssive source material will even bypass this conversion. (from 480i to 480p)

2. The upscaler is never better than progrssive scan dvd player (480p). Upscaling an analog input signal will result to terrible or fairly nice result. Because you are going to upscale a degraded signal coming from analog output of dvd player.it will never look as good and sharp as progressive output of a dvd player. Meaning even if you upscale the 480i analog output of a dvd player to svga, the progressive 480p vga will still be much better.

3. To convert progressive component video to vga , a simple circuit transcoder is needed not an upscaler.

4. Pc is good but i prefer a dvd player for video and just play games in smaller monitor

Kindly comment if some things are misunderstood. I had just read it earlier.

[hertzblaster]

BTw, with the existence of dvd player with vga output, things may have simplified for projector diyers. Unfortunately, these are low quality dvd players. Pioneer Taiwan has already come-up with dvd player with vga output (480p). Its for their own consumption only.

[audiobot]

I think with HTPC the dvd-rom output is taken as the progressive output. Other advantages include many many possibilities to adjust color ratios, color temperature, refresh rate, etc, etc.

I am just beginning to play with the connection between HTPC and a Sharp QA-1650, but already I see better picture quality than the S-video output from the DVD play. Also it is easier to get good color on the projection screen.

Congratulations on your build, by the way, it is very nice. Also wanted to mention that from what I could understand in an optics text, aluminum is a better reflector than chrome.

Michael

[ace3000_1]

hertz, it depends what hardware you own and if your using a software dvd player or not on the comp, and what functions it has. In all computers its all digital right the way through until output, and if you have a digital panel then you can get a digital signal from the comp's vid card if it has a dvi port.

If you or the guy who made the article had a search around on the net, you can get scan converters for comps too, it comes all at a price, and these days things for comps are cheap, it depends on what quality you desire vs price.

In my eyes comps are far better then stand alone dvd players, just look at what you can do whith comp as in settings and versatility compared to a dvd player. Hell you can get programs that have been mentioned in here before for the comp that does scan converting. If i wer to price my comp with its options as stand alone equiptment, it would be worth thousands, and this is one reason why people make a all in one unit rather then just buy the seperate receivers, dvd players ect, not to forget the upgradablity at a cheap price.

Depending on the hardware, its not hard at all to acheive a better quality with a comp compared to a stand alone unit, just look at sound cards, the majority are far clearer and have a better freq and sig to noise ratio then most mid ranged recievers at a fraction of the price.

Trev

[ace3000_1]

I think with HTPC the dvd-rom output is taken as the progressive output.

It comes out as digital if you set it up right, the sound too, in win xp it should be digital on default, only the vid card will change it to anolog or dvi. Interlacing and all the other gizmo is done with the software player. Only one that ive ever owned had that in a harware ver, and that had a seperate card that attached to the vid card, quite old i might add, about 2000 they came out, not needed no more because the dvd can spin fast enough to projuce enough data for the cpu or what have u decode it.

Trev