Variable focal length TV / screen

Click For Summary

Discussion Overview

The discussion centers around the concept of creating a screen that can simulate varying focal lengths to reduce eye strain from close-up viewing. Participants explore potential methods and technologies that could achieve the effect of making a nearby screen appear further away, considering both theoretical and practical applications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant suggests that equipping each pixel with a lens could project a near-collimated beam of light, making the screen appear further away while maintaining pixel clarity.
  • Another participant mentions the possibility of using a telescope in reverse to achieve a similar effect, while also contemplating the visual setup required for such a configuration.
  • There is a proposal to use liquid lenses that adjust based on eye tracking to enhance the viewing angle and focus dynamically.
  • A suggestion is made to utilize video recorded with a light-field camera, which could allow for selective focus based on where the user is looking, potentially applicable in virtual reality settings.
  • One participant references head-up displays that project images at infinity as a related technology that could inform this discussion.

Areas of Agreement / Disagreement

Participants express various ideas and approaches, but there is no consensus on a single method or solution. Multiple competing views and technologies are presented without resolution.

Contextual Notes

Some limitations include the dependence on specific technologies like liquid lenses and light-field cameras, as well as unresolved questions about the practical implementation and effectiveness of the proposed solutions.

Who May Find This Useful

This discussion may be of interest to individuals exploring solutions for eye strain related to screen use, as well as those involved in display technology, optical engineering, and virtual reality development.

James125
Messages
19
Reaction score
0
Recently I have had a lot of eye strain from excessive computer use. The problem is because your eye lenses re stuck in a fixed position.

I wanted to know if it would be possible to make a screen that is 1m away look like it is 4m away for example. Would it be possible by making the screen out of focus somehow? Is it possible?
 
Science news on Phys.org
Interesting question. The first thought that comes to mind would be to equip each pixel with a lens that projects a near-collimated beam of light toward the user's eyes. This should make the screen appear much further away and also keep each pixel from being blurred into the others surrounding it. Unfortunately this would greatly limit the angle at which the screen can be viewed.
 
You can do this already by looking through a telescope the wrong way for example. I'm still trying to think how it would "look" if each pixel had a lens / how you would have to set this up..

Regarding the viewing angle, you could use liquid lenses that can be adjusted accordingly by using a camera that tracks your eye position.

Another interesting idea could be to use video that has been recorded with a light-field camera, so tracking where you look on the screen will also bring into focus that area. Now that would be interesting to see, maybe this is something that can also be used in VR (but I don't know if 360 degree light-field cameras exist).
 
James125 said:
I wanted to know if it would be possible to make a screen that is 1m away look like it is 4m away for example.
Look up head-up-displays (no pun intended). They are usually projecting an image at infinity.
 

Similar threads

  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
6K
  • · Replies 7 ·
Replies
7
Views
5K
  • · Replies 4 ·
Replies
4
Views
345
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
2
Views
2K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 17 ·
Replies
17
Views
22K
  • · Replies 1 ·
Replies
1
Views
4K