Laser-based display?

[[email protected]]

Hi folks,

I'm interested in creating a display device that
I can build cheaply and which can cast an image
onto a wall, whether the wall is near or far.

Imagine I'm walking down the street, I take a
box out of my jacket, flick a switch, and a laser
begins drawing an image onto the wall of a
large building.

Ideally I'd like to have a computer inside the unit
that will have enough battery-backed storage
to hold several images.

I am thinking that drawing scan lines like a CRT
would greatly simplify the mirror motions.

Ideally, if several colors of lasers could be
combined, perhaps a video signal could be
used as input to draw a video onto a wall.

Can anyone tell me if this has been done
before, and how far the idea has been taken?

Thanks.

 

[martin griffith]

On 7 Oct 2006 14:33:59 -0700, in sci.electronics.design

Hi folks,

I'm interested in creating a display device that
I can build cheaply and which can cast an image
onto a wall, whether the wall is near or far.

Imagine I'm walking down the street, I take a
box out of my jacket, flick a switch, and a laser
begins drawing an image onto the wall of a
large building.

Ideally I'd like to have a computer inside the unit
that will have enough battery-backed storage
to hold several images.

I am thinking that drawing scan lines like a CRT
would greatly simplify the mirror motions.

Ideally, if several colors of lasers could be
combined, perhaps a video signal could be
used as input to draw a video onto a wall.

Can anyone tell me if this has been done
before, and how far the idea has been taken?

Thanks.

Hmm, I think you should check out some Issac Asmiov patents


martin

 

[John]

Hi folks,

I'm interested in creating a display device that
I can build cheaply and which can cast an image
onto a wall, whether the wall is near or far.

Imagine I'm walking down the street, I take a
box out of my jacket, flick a switch, and a laser
begins drawing an image onto the wall of a
large building.

Ideally I'd like to have a computer inside the unit
that will have enough battery-backed storage
to hold several images.

I am thinking that drawing scan lines like a CRT
would greatly simplify the mirror motions.

Ideally, if several colors of lasers could be
combined, perhaps a video signal could be
used as input to draw a video onto a wall.

Can anyone tell me if this has been done
before, and how far the idea has been taken?

Thanks.

You're looking for a pocket-sized equivalent of the laser projectors
used for light shows.
If you are physically able to move several hundred pounds of
batteries, you can have almost any size display you want ;-)

 

[John B]

Hi folks,

I'm interested in creating a display device that
I can build cheaply and which can cast an image
onto a wall, whether the wall is near or far.

Imagine I'm walking down the street, I take a
box out of my jacket, flick a switch, and a laser
begins drawing an image onto the wall of a
large building.

Ideally I'd like to have a computer inside the unit
that will have enough battery-backed storage
to hold several images.

I am thinking that drawing scan lines like a CRT
would greatly simplify the mirror motions.

Ideally, if several colors of lasers could be
combined, perhaps a video signal could be
used as input to draw a video onto a wall.

Can anyone tell me if this has been done
before, and how far the idea has been taken?

Thanks.

Elektor magazine published one this month. Have a look here:


http://www.elektor-electronics.co.uk/Default.aspx?tabid=27&art=53201&PN=
On

 

[J.A. Legris]

Hi folks,

I'm interested in creating a display device that
I can build cheaply and which can cast an image
onto a wall, whether the wall is near or far.

Imagine I'm walking down the street, I take a
box out of my jacket, flick a switch, and a laser
begins drawing an image onto the wall of a
large building.

Ideally I'd like to have a computer inside the unit
that will have enough battery-backed storage
to hold several images.

I am thinking that drawing scan lines like a CRT
would greatly simplify the mirror motions.

Ideally, if several colors of lasers could be
combined, perhaps a video signal could be
used as input to draw a video onto a wall.

Can anyone tell me if this has been done
before, and how far the idea has been taken?

Thanks.

If you want a rasterized image, a DLP projector is simpler, brighter
and faster than a mechanically scanned laser.

http://www.dlp.com

 

[Brendan Gillatt]

Can anyone tell me if this has been done
before, and how far the idea has been taken?

Take a peek at this:
http://news.bbc.co.uk/2/hi/technology/5359724.stm

Apparently small green lasers aren't powerful enough to project yet so
no full colour.

 

[[email protected]]

Thanks Brendan, I've found more on that.

http://www.fraunhofer.de/fhg/EN/press/pi/2004/11/Mediendienst112004Thema6.jsp