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Mobile Phone Projectors "Will Launch This Year"
Posted by
kdawson
on Wed Jan 09, 2008 03:56 AM
from the is-that-a-laser-in-your-pocket dept.
from the is-that-a-laser-in-your-pocket dept.
An anonymous reader writes "Mobile phones with built-in mini projectors will launch later this year, according to 3M, which gave PC Pro a hands-on demonstration of the technology at CES 2008. The projector has a brightness of around 8-10 lumens, and is capable of displaying an image of up to 50 in., although 3M's spokesperson Greg Roberts told us that, with perfect lighting conditions, it's possible to squeeze a 60-in. screen out of the projector."
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8- 10 lumins? (Score:5, Insightful)
Re:8- 10 lumins? (Score:4, Interesting)
Parent
8- 10 inches? (Score:4, Funny)
Are you sure you're not just happy to see me?
Parent
Re: (Score:3, Interesting)
Re:8- 10 lumins? (Score:5, Interesting)
My Nokia N95 has a 5 MegaPixel camera which produces some pretty good quality photos and video. It is hard to appreciate this quality on the 3"ish screen so having a projector would be a nice feature. No idea when I'd use it though, I can hardly imagine whipping out the projector at work or uni to show my mates my oh so cool pics. But this is the first time I've had a phone that does more than just do calls and texts, on a recent holiday I must've taken about 500 pics on the 4GB microSD card in it. Mobile phones are becoming very nice indeed imo.
Parent
Missing the point.... (Score:5, Insightful)
Remember polyphonic ringtones? Were they "quality" music? Nope, but we all secretly wanted them.
The gadget power of having a phone-projector is orders of magnitude more than a polyphonic ringtone. This thing will sell millions no matter how bad the image quality is.
Parent
Re: (Score:3, Informative)
Re: (Score:3, Insightful)
Re: (Score:3, Funny)
Re: (Score:3, Informative)
"The SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela."
A small AA battery maglite has 15.2 lumens average, so it's brighter than a small flashlight... if that floats your boat, er lights your night.
a basic tutorial (Score:5, Informative)
A 'normal' candle produces about 15 lumens. Incandescent bulbs (normal lightbulbs) produce about 15-18 lumens *PER WATT*. So this projector is roughly equivalent to
Now, there are claims of a 50" projection (diagonal, I assume) from this-- no specification as to how far from the projection source the 'screen' is, but light works on the inverse square law-- basically, as you double the distance from a given light source, you get a square root of intensity. So if this sucker threw 10FC at 1 foot, at 2 feet that intensity has dropped to 3.2. At 4 feet, 1.8. So if that 50" screen requires you to be 8 feet back.. forget about it.
Overall, this sounds like a cool little geek gadget, but as other posters have said, probably just another example of cellphones trying to do too much (too poorly
Apologies if I screwed up any of my tutorial, as I said, I don't paint directly with light, I just admire the guys who do.
Parent
Re:a basic tutorial (Score:4, Insightful)
All that matters here is light output divided by the square inches of the screen. Assuming that this screen has a 4:3 aspect ratio and produces a 50" diagonal image, that means it produces 1200 sq in of image. This gives 10 lumens / 1200 sq in =
I have no idea though if that's a lot or a little.
Parent
oh joy (Score:4, Funny)
Seriously though, it is pretty cool.
That being said, I bought a cigarette lighter this week, and when I got home I discovered it had a laser pointer built into it, all for two bucks.
Soon my microwave will be able to use it's laser pointer to point at the projection it puts on my wall that my popcorn is done, as opposed to beeping, which would be oh so gauche.
I can see it now... (Score:5, Funny)
Re:I can see it now... (Score:5, Funny)
Parent
Re: (Score:3, Informative)
YOU FAIL!
Re:I can see it now... (Score:4, Funny)
Parent
I thought it was a dupe... (Score:5, Insightful)
phones? bah! (Score:4, Interesting)
I am waiting for my mini laser powered home cinema projector that I can get for £100 (or $200 if you like), never have to change a £300 bulb on a £300 projector, never have a loud whirry fan and huge amounts of excess heat, generates a good HD image with a respectable amount of lumens and can be tastefully hidden in a wall of books with a drop down projector screen on the over side of the room. Now *thats* a product I would get excited by.
Rubbish 10 lumen images projected from a bloody mobile phones of all gizmo's are nothing to me except an obvious tactic to attempt to sell phones. Of course the projector market might suppress this because of bulb sales, but who knows?
The alternative use for this technology is mini computers with projected screens and laser/IR keyboards that can fit in a pocket and allow office work against a hotel wall with full wifi, SSD and decent battery life. Now thats another use I would get exited by. I want my Zardoz projector/interface ring.
Re:phones? bah! (Score:4, Informative)
This [pcmag.com] might interest you, then.
Parent
Re:phones? bah! (Score:4, Funny)
Your language usage is weird. The word you are looking for is "bright", not "a respectable amount of lumens". Similarly, it's "hot", not "a respectable amount of celcius". And Sahara is "big", not "a respectable amount of square kilometers". Finally, Bush is "dumb", not "having an embarassing amount of IQs".
Parent
Disruptive technology (Score:5, Insightful)
Now imagine in a few years where your display surface might just be a cheap light screen with a simple support to hold it at different angles. The computer can be almost any shape that suits, perhaps with a fold out keyboard. You can have a big screen on your desk, a small clip on screen that you use on the train. Perhaps the computer has a wireless dongle that includes the display driver, perhaps it's built in, perhaps both.
Using a curved screen might involve no more than an adjustable object in the optical path to deal with the pincushion distortion - use of lasers means focus at virtually any distance.
Microsoft has built up a huge business based solely on the mouse, monitor,keyboard model. Apple has started to move away from it. This is a little gadget which could reshape the desktop computer industry. It shouldn't be underestimated.
That's more like 5 inches (Score:4, Informative)
Obviously this depends on ambient light, since the darkest part of the screen (i.e. the "black spot") is illuminated only by ambient light (assuming that 'black' in the projector means 'no light passes').
Illuminance is measured in Lux (lx). Lux is defined as follows.
Lux = Lumen / m^2.
Now, a "good" contrast is 10-15, i.e. a white spot will be illuminated with 10-15 times the lx a black spot is.
Normal ambient light is highly variable; a typical table in a lecture room should be illuminated with about 500-1000 lx; the ambient light on your typical screen in an illuminated room (i.e. not a theatre) will be illuminated with maybe 100-500 lx.
So in order to obtain a proper picture a projector should be able to do at least 1000 lx. Comparison: a typical home cinema beamer has about 2000 lumen and projects an area of about 2x1.12m; this means 2000 lumen / 2.24 m^2 = ~900 lx. And guess what, the picture is just fine when the room is "quite dark" and pretty washed out when it is illuminated.
With the claimed 8-10 lumen - let's assume 10 - you can thus illuminate
10 lumen / 1000 lx = 0.01 m^2
Assuming a picture format of 16:9, that's a picture size of
sqrt(0.01 m^2 / (16 * 9)) * 16 = 0.13 m width
sqrt(0.01 m^2 / (16 * 9)) * 9 = 0.075 m height
An incredible 13 cm x 7.5 cm! (5" x 3" for Americans).
That's a diagonal of 5.8". Makes sense since a 2000 lumen projector is 200 times more powerful and accordingly projects an image with sqrt(200) = ~14 times the diagonal.
Except in the darkest of situations, you will *never* have an usable 50 inch image with a lousy 10 lumen.
Re:For your cellphone? what use is that? (Score:5, Funny)
Why a cellphone? so that everyone can see who's calling me?
Wait, you mean, you mainly use your cellphone to give/receive phone calls? lol! 1998 just called, they want you back.
Parent
Re:Battery life ... (Score:4, Informative)
I guess when all that space is used for making a plain phone instead of the swiss army phone, the designers can concentrate on doing one thing well. In this case that one thing is making calls.
Parent