I get 23% smaller dot size. Add to that 29 % more dots.
Not sure if my math from here is correct but can we say theoretically the image will be 52% sharper than the sgi 1600sw?
It thats correct thats a pretty big improvement.
Actually the dot size on a xga 15" monitor say cmv is .297. If we compare dot size only
we get: 40% smaller dot size to our 15.4 wuxga screen.
To give a relationship idea, lets say your dot is 8mm on the wall using the cmv lcd monitor.
If you use the 15.4 wuxga lcd screen the dot would be 4.8mm on the wall.
I think combining res and dot size can make this the winning diy projector for a while anyway.
Has anyone tested this 6 element copy lens with a 15 inch lcd?
I would like to hear from this person.
Not sure if my math from here is correct but can we say theoretically the image will be 52% sharper than the sgi 1600sw?
It thats correct thats a pretty big improvement.
Actually the dot size on a xga 15" monitor say cmv is .297. If we compare dot size only
we get: 40% smaller dot size to our 15.4 wuxga screen.
To give a relationship idea, lets say your dot is 8mm on the wall using the cmv lcd monitor.
If you use the 15.4 wuxga lcd screen the dot would be 4.8mm on the wall.
I think combining res and dot size can make this the winning diy projector for a while anyway.
Has anyone tested this 6 element copy lens with a 15 inch lcd?
I would like to hear from this person.
The six element copy lens is from DIYbuildergroup or JCB. He has already used and/or tested this lens with 4:3 15 inch and is said to have very high image quality.
I will probably stick to my 135 mm diameter 450 mm FL cooke triplet for now. It will have a brighter image though not as sharp.
Hezz
I will probably stick to my 135 mm diameter 450 mm FL cooke triplet for now. It will have a brighter image though not as sharp.
Hezz
I imagine the 18 bit frame modulation color "trick" might be noticable to some degree (as compared to a native 24 bit), but probably not too bad. DEpends on how fast it can do it. I would think that the extra resolution would put a WUXGA setup over the top. Also, maybe one of the newer WUXGA screens has actually migrated to 24 bit by now.
Decent basic article on 18 bit vs 24 bit issue :
http://graphics.tomshardware.com/display/20031105/lcd-06.html#18_and_24bit_color_interpolations
Decent basic article on 18 bit vs 24 bit issue :
http://graphics.tomshardware.com/display/20031105/lcd-06.html#18_and_24bit_color_interpolations
WUXGA ppi
Per Dell, their 15.4" 1920x1200 is 147 pixels per inch.
Separately, I read a review of a Dell WUXGA machine and it mentioned some trailing in game play. Is the response time sufficient for top quality movie viewing?
I am very interested in hi-res projectors and also this controller, though from a price standpoint the screen + controller price point is approximately the same as a 1 year old Dell computer on ebay. Could there be an advantage in having the people who are committing to buy a controller kick in say $15 each for some experienced strip artist to buy a used Dell and see if it can be stripped and used as is?
Just some thoughts.
Michael
Per Dell, their 15.4" 1920x1200 is 147 pixels per inch.
Separately, I read a review of a Dell WUXGA machine and it mentioned some trailing in game play. Is the response time sufficient for top quality movie viewing?
I am very interested in hi-res projectors and also this controller, though from a price standpoint the screen + controller price point is approximately the same as a 1 year old Dell computer on ebay. Could there be an advantage in having the people who are committing to buy a controller kick in say $15 each for some experienced strip artist to buy a used Dell and see if it can be stripped and used as is?
Just some thoughts.
Michael
Hezz,
Can jcb get these copy lenses regularly? I dont see it on his site anymore.
"Also, maybe one of the newer WUXGA screens has actually migrated to 24 bit by now"
Thats an assumption that has little power. If there is a 24 bit laptop wuxga screen we would have heard about it. It would be big news and would have found plenty of results on google.
Can jcb get these copy lenses regularly? I dont see it on his site anymore.
"Also, maybe one of the newer WUXGA screens has actually migrated to 24 bit by now"
Thats an assumption that has little power. If there is a 24 bit laptop wuxga screen we would have heard about it. It would be big news and would have found plenty of results on google.
You can count me in for one of these controllers, as long as we can get the bios tuned for the Samsung LTN154U1/LTN154U1-L02.
Dracul,
I know JCB had those 6 element lenses for sale but he had a limited suppy last time I checked. I don't know if they were surplus or he has aother source for them. You will have to ask him.
150 dots per inch sounds more reasonable but is still very good. Somehow I must have been thinking about the NEC QXGA LCD which is even higher resolution.
I have not searched exhaustively, but from the searching that I have done it seems that only LCD panels which are designed to be TV screens in 20 - 33 inch sizes are ever likely to be 24 bit.
It doesn't make sense from a cost point of view to make 15 - 17 inch screen in 24 bit because the majority of those screen will be sold for notebook computers. Cheap LCD tv's of smaller sizes are likely to use lower resolution LCD's like 1280 x 768.
I have to admit that for me the reduction in screen door is a bigger issue. Many of the expensive LCD HDTV's on the market have significant screen door when looking up close. The nice thing about projecting the image is that the optics diffuse the pixel image a little bit which as long as it is not to much helps to remove the screen door effect.
Large 24 bit LCD panels are available right now in 20 - 23 inch sizes if you wanted to pay the 800 - 900 USD price for the panel but you would have trouble finding a lens with the right FL and wide angle.
Hezz
I know JCB had those 6 element lenses for sale but he had a limited suppy last time I checked. I don't know if they were surplus or he has aother source for them. You will have to ask him.
150 dots per inch sounds more reasonable but is still very good. Somehow I must have been thinking about the NEC QXGA LCD which is even higher resolution.
I have not searched exhaustively, but from the searching that I have done it seems that only LCD panels which are designed to be TV screens in 20 - 33 inch sizes are ever likely to be 24 bit.
It doesn't make sense from a cost point of view to make 15 - 17 inch screen in 24 bit because the majority of those screen will be sold for notebook computers. Cheap LCD tv's of smaller sizes are likely to use lower resolution LCD's like 1280 x 768.
I have to admit that for me the reduction in screen door is a bigger issue. Many of the expensive LCD HDTV's on the market have significant screen door when looking up close. The nice thing about projecting the image is that the optics diffuse the pixel image a little bit which as long as it is not to much helps to remove the screen door effect.
Large 24 bit LCD panels are available right now in 20 - 23 inch sizes if you wanted to pay the 800 - 900 USD price for the panel but you would have trouble finding a lens with the right FL and wide angle.
Hezz
Could be done,
in fact I could model one on the computer but I think with pixel sizes getting smaller and smaller that a higher resolving lens with more elements may be required.
It would be expensive to have made in small quantities but could be made by hand for a reasonable cost and lots and lots of labor.
Hezz
in fact I could model one on the computer but I think with pixel sizes getting smaller and smaller that a higher resolving lens with more elements may be required.
It would be expensive to have made in small quantities but could be made by hand for a reasonable cost and lots and lots of labor.
Hezz
Do you think we could convince them to sell a smaller quantity with the BIOS tuned if we agreed to pay more per unit? Say we get 20-25 people together and offer to pay $300-350 instead of $250 to compensate for the time they are putting into tuning the BIOS for a smaller # of units?
Furthermore, which do you guys think is the better 15.4" WUXGA panel?
Manufacturer LG Philips
Part Number LP154WU1
Screen Size 15.40
Panel Type TFT
Resolution 1920X1200
Brightness 185
Manufacturer Samsung
Part Number LTN154U1-L02
Screen Size 15.40
Panel Type TFT
Resolution 1920X1200
Manufacturer Toshiba
Part Number LTD154EZ0S
Screen Size 15.40
Panel Type TFT
Resolution 1920X1200
Brightness 190
Manufacturer Toshiba
Part Number LTD154EZ0C
Screen Size 15.40
Panel Type TFT
Resolution 1920X1200
Manufacturer Toshiba
Part Number LTD154EZ0D
Screen Size 15.40
Panel Type TFT
Resolution 1920X1200
Can anyone dig up the detailed spec. sheets for these panels so we can make an intelligent comparison? I haven't had any luck locating them. From what I have found, the Toshiba panels have a 50 ms response time, so I think that knocks them out of the running right there. The samsung has a 25 ms response time, and I haven't been able to find out anything about the LG panel.
Manufacturer LG Philips
Part Number LP154WU1
Screen Size 15.40
Panel Type TFT
Resolution 1920X1200
Brightness 185
Manufacturer Samsung
Part Number LTN154U1-L02
Screen Size 15.40
Panel Type TFT
Resolution 1920X1200
Manufacturer Toshiba
Part Number LTD154EZ0S
Screen Size 15.40
Panel Type TFT
Resolution 1920X1200
Brightness 190
Manufacturer Toshiba
Part Number LTD154EZ0C
Screen Size 15.40
Panel Type TFT
Resolution 1920X1200
Manufacturer Toshiba
Part Number LTD154EZ0D
Screen Size 15.40
Panel Type TFT
Resolution 1920X1200
Can anyone dig up the detailed spec. sheets for these panels so we can make an intelligent comparison? I haven't had any luck locating them. From what I have found, the Toshiba panels have a 50 ms response time, so I think that knocks them out of the running right there. The samsung has a 25 ms response time, and I haven't been able to find out anything about the LG panel.
http://www.samsung.com/Products/TFTLCD/NotePC/LTN154U1/LTN154U1.htm
Don't know what the difference in the L02 and L01 Models are
Don't know what the difference in the L02 and L01 Models are
i don't know about others but i wouldn't go for the second option listed in your list ... my cousin owns the authorized service center for this particular company and says the tft quality is not good at all he is himself using a benq in his pj ( be a bit careful when condemning any manufacturer praising em is ok)
btw for custom made lens i know a manufacturer who would do 50 pcs or may be even less but definatly not lessthan 25 the exact specs would be needed or a piece if its ready cause they are well on the bussiness of reverse engg any product and making it fit our budget.
btw for custom made lens i know a manufacturer who would do 50 pcs or may be even less but definatly not lessthan 25 the exact specs would be needed or a piece if its ready cause they are well on the bussiness of reverse engg any product and making it fit our budget.
Projectile, I have already designed a higly optimised wide angle cooke triplet and can supply the exact specs for the lens. I may be able to adapt it slightly for reduced manufacturing costs.
It is in one of the archived threads. I will search for it.
Here is a link to one of the files. It is a word file I believe. Look at the thread entitled something like "High end DIY triplet lens" in the DIY projector forum. It was an old thread that I had to resurrect from the archives.
http://www.diyaudio.com/forums/attachment.php?s=&postid=317648&stamp=1075830513
Hezz
It is in one of the archived threads. I will search for it.
Here is a link to one of the files. It is a word file I believe. Look at the thread entitled something like "High end DIY triplet lens" in the DIY projector forum. It was an old thread that I had to resurrect from the archives.
http://www.diyaudio.com/forums/attachment.php?s=&postid=317648&stamp=1075830513
Hezz
got it ,but when opened in word only one image file is visible whereas it seems two other are missing just double check it once bud the diameter of the lens also needed .. i dunno if its my word processor that's not displaying properly mail it to me in pdf if possible will get back to you by email around 3rd cause these guys are super busy till new year.
🙂
🙂
Projectile,
Here is an edited version of the word file to make it a little clearer. All three drawings are opened for me but with word if you are scrolling the drawings don't show up. You have to have one whole page showing for graphic to load. All diameters are shown but if you have a hard time reading this I will send PDF file to your e-mail if you e-mail me back. Good luck with this. If it turns out, maybe Alan at DIYprojector or JCB and DIYbuilder group will sale the lens for you in the US.
Some convensions: When reading the lens drawings all lenses are from left moving to the right. So lens one is the most left lens. Two the middle and three the right lens. The right and left surfaces of the lenses also follow this convension which is very important and referenced from the first lens.
The drawings are a little hard to read but all information is there if you look carfully at the whole drawing. Glasses must be exact or exact equivalents for lens to reach good results. Index of refraction and dispersion are given for each glass type. If necessary you can zoom in on the drawing to see it better.
Hezz
Here is an edited version of the word file to make it a little clearer. All three drawings are opened for me but with word if you are scrolling the drawings don't show up. You have to have one whole page showing for graphic to load. All diameters are shown but if you have a hard time reading this I will send PDF file to your e-mail if you e-mail me back. Good luck with this. If it turns out, maybe Alan at DIYprojector or JCB and DIYbuilder group will sale the lens for you in the US.
Some convensions: When reading the lens drawings all lenses are from left moving to the right. So lens one is the most left lens. Two the middle and three the right lens. The right and left surfaces of the lenses also follow this convension which is very important and referenced from the first lens.
The drawings are a little hard to read but all information is there if you look carfully at the whole drawing. Glasses must be exact or exact equivalents for lens to reach good results. Index of refraction and dispersion are given for each glass type. If necessary you can zoom in on the drawing to see it better.
Hezz
Here is a picture of the solid model:
The largest diameter lens goes towards the screen. The small end towards the LCD. I calculated that a 17 inch LCD will need about 33 degrees field of view and this lens is corrected for 40 degree field of view so it would probably work with 19 - 20 inch LCD.
The largest diameter lens goes towards the screen. The small end towards the LCD. I calculated that a 17 inch LCD will need about 33 degrees field of view and this lens is corrected for 40 degree field of view so it would probably work with 19 - 20 inch LCD.
Attachments
- Status
- Not open for further replies.