Stanley514 said:
This dispute went ridiculous. I was thinking about future yet unknown technology and only attempted to give some clue how approximately it could work. While someone here blame me that it is not going to work very well. Of course, some breakthrough is required, I didn't assume it is going to work right away.
You presented and stuck to a specific idea which was shot down multiple times. Had you asked, "Is there a way to create a screenless image", then this thread would have gone differently. There is no "breakthrough" needed here because your idea doesn't even make any sense in the way you've presented it.
What is concerning to laser focus, everything depends at least in two things: the focal length and the angle of defocusing. Maybe someday it would be possible to make it defocus 360 degree wide, so it will radiate light in all sides completely evenly, and viewing angle will be practically unimportant.
The focus of the laser is entirely irrelevant. Defocusing the laser simply turns it from a coherent beam which can only be viewed from directly in front of the laser to something similar to a normal light bulb which can be viewed from a wide angle. An array of lasers can easily make an image similar to how a TV screen works, except that unless you defocus each beam, you'd need to stand directly in front of the lasers.
The amount of divergence of a cone of light entering your eye determines how your eye focuses it, not how it forms an image. For example, the light from a very distant object like a star enters your eye with practically zero divergence. It is essentially composed of parallel rays. In contrast, the light from you TV is diverging when it enters your eye. The lens of the eye alters its shape in order to bring light from objects at different distances to a focus.
Using a spotting scope with an adjustable focus, you can easily adjust the divergence of the light from an object at a set distance by moving the focus back and forth. Generally the most comfortable focus position for viewing an object through a scope is one where the light from the object enters the eye with very little divergence. That way the lens of the eye can completely relax and you don't have to expend any effort to bring the light into focus on your retina. Moving the scopes focus will cause the light to diverge before entering your eye instead of being composed of parallel rays, so your lens will flex in order to bring the light into focus on your retina. No matter how the focus is set, the image appears the same once it is focused on the retina. As you can see, whether the light is diverging or not doesn't have any effect on the image, it only affects what needs to happen to bring the image into focus.
When the light enters your eye with no divergence, it is acting like a laser beam. A laser beam has little to no divergence over a long distance. Adjusting the focus to make the light diverge before entering the eye is similar to the light coming from your TV. The light leaves each pixel in a diverging cone which means that you don't have to stand right in front of the TV to see it, but now your lens has to flex in order to bring the part of the cone entering your eye into focus.
Does all that make sense?