I want to know if my supposition is possible and achievable, or if it is impossible.
I was considering that colors are just reflection of the light toward the eye's retina. It is the case because only in presence of light we see color and shapes, while in absence of light there is no color and no visible shape of objects.
This is a good explanation of this theory https://www.colormatters.com/color-and-vision/how-the-eye-sees-color
Now, in the tech world there is a good interest in developing virtual reality technology. I see Facebook (now Meta) investing in OculusVR, Google tried the Google Glasses and other companies are developing VR technologies.
But all those technologies have head-mounted devices, which I highly doubt customers would wear, especially for a prolonged period, and I see it even less as a solution to improve human's daily activities.
Is there a possibility to develop a projector that projects light directly in the human eye, and that generate an hologram in this way? The hologram, with this method, i guess would probably be seen only by the individual who gets the light pointed toward him. How possible is such technology? What problems am I not considering?
Enrico Cagliari Using an optical see-through eyepiece, holographic virtual pictures may be directly projected onto the retina. When the crystal lens can focus at different depths, the virtual picture is sufficiently clear; the described approach may overcome convergence and accommodation conflict when using near-eye displays.
A virtual retinal display (VRD), also known as a retinal scan display (RSD) or retinal projector (RP), is a display device that projects a raster image (similar to that of a television) directly onto the retina of the eye. In front of the user is what appears to be a normal display floating in space.
Qamar Ul Islam I see now Apple has patented Apple’s Glasses https://appleinsider.com/articles/21/10/26/apple-glass-could-project-ar-directly-onto-a-wearers-retina/amp/ , and Google tried a similar technology with Google Glasses.
My first question is, why is so difficult for them to implement? What difficulties are they facing? Because it seems to me that in theory this is totally doable.
Second, and most important question. I want you to take a look at https://whyholopro.com/ , it is a website that I developed where I pitch the technology using projectors instead of head-mounter glasses or visors. The end result should be to simply being able to see new objects only because the user receive the light beam produced by the projector.
This approach would not only being more comfortable for the user, which I doubt they will wear any device, but it will allow projecting on a multitude of people (a projector directed on a group of people should allow the whole group to see the object).
I see first applications of this technology in the entertainment industry, but it could be implemented in numerous industries and applications.
How difficult would be to reach a human life like represented in this video https://www.youtube.com/watch?v=7R2py3avJPM&t=14s ?
Because I am of the opinion that we have all the conditions to do it, but because we still are not there, maybe I'm missing something. What am I not considering?
Dear Enrico Cagliari,
Here is some relevant info:
Holographic virtual images can be directly projected onto the retina using an optical see-through eyepiece.
The virtual image is sufficiently clear when the crystal lens can focus at different depths; the presented method can resolve convergence and accommodation conflict during the use of near-eye displays.
Is retinal projection safe?
Here too the warning of potentially damaging one's eyes cannot be underestimated. Sending the full brightness of a small (pico)projector essentially straight into one's eye can cause permanent damage and blindness.
How does virtual retinal display work?
A virtual retinal display (VRD), also known as a retinal scan display (RSD) or retinal projector (RP), is a display technology that draws a raster display (like a television) directly onto the retina of the eye. The user sees what appears to be a conventional display floating in space in front of them.
What projects image onto the retina?
Direct retinal projection: VISIRIUM® Technology. VISIRUM® Technology projects images onto the retina like a planetarium creates a starry sky. The light manipulation is a futuristic technology cultivated in laser development, which is totally different from conventional technology using a small display.
Dear Enrico Cagliari,
Here is some auxiliary info:
Recent progresses of near-eye display for AR and VR
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11785/1178503/Recent-progresses-of-near-eye-display-for-AR-and-VR/10.1117/12.2596128.short?SSO=1
Len Leonid Mizrah I want to thank you for your valuable input in this discussion.
However, I still have the doubt. All the infos you cited talk about “glasses” or “vr visors” as the way to go to achieve virtual reality.
I think we should NOT use any glasses or visors, and instead we should focus on developing a projector that emit the right light impulses to generate the hologram image.
The projector I am referring, is literally a projector: not weared by the user, but only placed in front (or maybe at an angle) of the user‘s field of view.
At the end of the day, every object, shape and color we see in real life is thanks for the light reflected by the object toward the human’s eye and the human’s field of view.
Why not artificially engineer this natural characteristic of the human’s vision, and therefore find a way to create lightbeams that would be equivalent to the ones created by the objects?
simply put, my question is, is it doable and can make sense to develop a projector, which emit light toward human’s eye, in order to generate an hologram image? And definitely we do NOT want technology that has to be worn.
Enrico Cagliari ,
Take a look at those two videos below - a hologram projector is not only possible but there's quite a room for improvements here..
https://www.google.com/search?q=Is+it+doable+and+can+make+sense+to+develop+a+projector%2C+which+emit+light+toward+human’s+eye%2C+in+order+to+generate+an+hologram+image%3F&oq=Is+it+doable+and+can+make+sense+to+develop+a+projector%2C+which+emit+light+toward+human’s+eye%2C+in+order+to+generate+an+hologram+image%3F&aqs=edge..69i57.40538j0j1&sourceid=chrome&ie=UTF-8#kpvalbx=_wpReYui5E6imqtsPz_2-kAw18
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https://www.google.com/search?sxsrf=APq-WBv-Eh5EKBMVXpItF7HGoYL5Yqj0jg:1650365634325&q=Can+you+make+a+hologram+projector%3F&sa=X&ved=2ahUKEwjoooiL-5_3AhUok2oFHc--D8IQzmd6BAggEAU&biw=1459&bih=738&dpr=2.55#kpvalbx=_KJheYsuwGZyfqtsP2uywwA819
Is hologram projection possible?
In principle, it is possible to make a hologram for any type of wave. A hologram is made by superimposing a second wavefront (normally called the reference beam) on the wavefront of interest, thereby generating an interference pattern which is recorded on a physical medium.
How much does a hologram machine cost?
PORTL says that the machines can “beam” in people from anywhere in the world, and also play generated holograms and animations. And while the $60,000 device is simple enough to plug-and-play, recording the holograms looks like a serious task.
How to make at home a 3D hologram?
https://www.youtube.com/watch?v=yMLHfqSEEjk