Projector Phone

[CJHP]

Does anyone know if it is possible to project an image from a phone into the eye directly? Kind of like a Virtual Retina Display but actually works long distance. And can someone explain why if you hypothetically looked into the lens of a portable projector, you can't see an image.

[19_blackie_73]

3 minutes ago, CJHP said:

And can someone explain why if you hypothetically looked into the lens of a portable projector, you can't see an image.

Focus distance

At the right distance you will see an image, but that distance has to be very accurate

[Zando_]

2 minutes ago, CJHP said:

Does anyone know if it is possible to project an image from a phone into the eye directly? Kind of like a Virtual Retina Display but actually works long distance.

What? 

A Retina Display is just Apple's marketing term for displays with a ppi high enough that individual pixels are indistinguishable at normal viewing distances. 

3 minutes ago, CJHP said:

And can someone explain why if you hypothetically looked into the lens of a portable projector, you can't see an image.

I wouldn't advise looking in a projector in the first place. Pretty sure you can't see the image because it's the same as looking into a bright LED flashlight and trying to see the actual LED. 

[CJHP]

2 minutes ago, Zando Bob said:

What? 

A Retina Display is just Apple's marketing term for displays with a ppi high enough that individual pixels are indistinguishable at normal viewing distances. 

I wouldn't advise looking in a projector in the first place. Pretty sure you can't see the image because it's the same as looking into a bright LED flashlight and trying to see the actual LED. 

A VRD is an actual thing that isn't an apple marketing ploy. I mis-spelt the acronym, its Virtual Retinal Display 

Wiki Link: https://en.wikipedia.org/wiki/Virtual_retinal_display

[CJHP]

So if you lowered the light intensity and stood at the exact distance, the image would be visible?

[Zando_]

16 minutes ago, CJHP said:

So if you lowered the light intensity and stood at the exact distance, the image would be visible?

For a projector? Still doubt it. A projector's lens setup is meant to take a small image and blow it up big on a wall. You'd need the opposite of that, something closer to a camera lens, meant to take a big image and focus it to a smaller point. 

[CJHP]

4 minutes ago, Zando Bob said:

For a projector? Still doubt it. A projector's lens setup is meant to take a small image and blow it up big on a wall. You'd need the opposite of that, something closer to a camera lens, meant to take a big image and focus it to a smaller point. 

so a projector uses a convex lens right (with a bunch of other ones before that too). So if you replaced the convex lens with a concave lens, then the image would go from 'big to small' and therefore at the right distance, it could theoretically focus onto the retina. 

[Zando_]

2 minutes ago, CJHP said:

so a projector uses a convex lens right (with a bunch of other ones before that too). So if you replaced the convex lens with a concave lens, then the image would go from 'big to small' and therefore at the right distance, it could theoretically focus onto the retina. 

Yeah I'm gonna guess it's a little more complicated than that lol. 

[CJHP]

2 minutes ago, Zando Bob said:

Yeah I'm gonna guess it's a little more complicated than that lol. 

yeah i agree. Would be cool if a company could make a monitor with this technology or something. If it's possible, that is. 

[Zando_]

1 minute ago, CJHP said:

yeah i agree. Would be cool if a company could make a monitor with this technology or something. If it's possible, that is. 

Not really. In a VR headset it could make sense I guess? Since those are literally strapped to your face and never change position relative to your eyes. With a monitor, trying to keep it aimed and focused into your damn eyeball would be horribly difficult, if not impossible. It seems to be mostly used for HUD type stuff though (and attached to a helmet, again not changing position relative to your eyes), basically putting an overlay over what you see, not being used to just have block of content you then consume. Doesn't seem like a good idea for monitors or anything like that. 

[CJHP]

 

1 minute ago, Zando Bob said:

Not really. In a VR headset it could make sense I guess? Since those are literally strapped to your face and never change position relative to your eyes. With a monitor, trying to keep it aimed and focused into your damn eyeball would be horribly difficult, if not impossible. It seems to be mostly used for HUD type stuff though (and attached to a helmet, again not changing position relative to your eyes), basically putting an overlay over what you see, not being used to just have block of content you then consume. Doesn't seem like a good idea for monitors or anything like that. 

This is going to sound crazy, and im aware of the dangers. But if they replaced the projector with some sort of laser formed from around 1000x1000 pixels, then if the laser was low intensity, it wouldnt damage your eye and wouldn't have a focusing issue?

 

Crazy i know, but just seems almost possible with my limited knowledge of physics lol. 

[Zando_]

6 minutes ago, CJHP said:

 

This is going to sound crazy, and im aware of the dangers. But if they replaced the projector with some sort of laser formed from around 1000x1000 pixels, then if the laser was low intensity, it wouldnt damage your eye and wouldn't have a focusing issue?

 

Crazy i know, but just seems almost possible with my limited knowledge of physics lol. 

"In 2018, Intel announced Vaunt, a set of smart glasses that are designed to appear like conventional glasses, which use retinal projection via a vertical-cavity surface-emitting laser and holographic grating.[6] Intel gave up on this project,[7] and sold the technology to North.[8]"

 

Off that exact wiki page you linked: https://en.wikipedia.org/wiki/Virtual_retinal_display. Intel already fiddled with lasers. But again it's a purpose built device and pretty different from a projector, I don't see why getting a projector to act like a VRD is better than just making a VRD in the first place. Seems to be a case of reinventing the wheel.