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Projectors are never infinity contrast as they cannot turn off individual pixels. Projectors have a single constant light source to all pixels like a non local

Projectors are never infinity contrast as they cannot turn off individual pixels. Projectors have a single constant light source to all pixels like a non local-array dimming TV. It's entirely up to the imaging panel to modulate the pixels, and none of the 3 panel types can block all the light for a pixel.

crazygringo 2y ago
Laser beam scanning (LBS) projectors are, they genuinely don't beam any light to a black pixel. Unfortunately they don't really exist commercially anymore. I hope the technology develops and they come back... in a way, they are to constant light source projectors what OLED is to LCD. They seem like the obvious evolution.
- SirMaster 2y ago
  Yeah, but I don't think anything like that has ever existed at actually usable brightness levels for a large home theater size screen, or at a resolution at least 1080p.
  - nkrebs13 2y ago
    He mentions at the end of the video that potentially multiple projectors could be used to increase brightness. Don't know anything about the tech -- just thought it was an interesting idea.
    - Animats 2y ago
      > multiple projectors could be used to increase brightness. Done in at least one early military large screen display system, using six CRTs (RGB x2) aimed at the screen. If one failed, the brightness dropped on the others but you still had an image. The USAF put a huge amount of effort into early large-screen displays.[1] Not very successfully. The most successful projection display before LCDs was the Eidophor. (1949-2000)[2] Big, expensive, complicated, high-maintenance, but reliable. Worked by distorting an oil film in vacuum with an electron beam. Biggest buyer was NASA's mission control center. In its final 1990s form, it was bright enough to be used in stadiums.[3] [1] https://en.wikipedia.org/wiki/Iconorama https://en.wikipedia.org/wiki/Iconorama [2] https://en.wikipedia.org/wiki/Eidophor https://en.wikipedia.org/wiki/Eidophor [3] https://www.youtube.com/watch?v=5783jPTKzjk https://www.youtube.com/watch?v=5783jPTKzjk
    - js2 2y ago
      Home theater hobbyists do this for sure. Recent example: https://www.avsforum.com/threads/double-stacking-two-epson-ls12000-projectors-for-a-200-projection-screen-experimentation-and-results.3306966/ https://www.avsforum.com/threads/double-stacking-two-epson-l...

crazygringo 2y ago

Laser beam scanning (LBS) projectors are, they genuinely don't beam any light to a black pixel. Unfortunately they don't really exist commercially anymore. I hope the technology develops and they come back... in a way, they are to constant light source projectors what OLED is to LCD. They seem like the obvious evolution.

SirMaster 2y ago
Yeah, but I don't think anything like that has ever existed at actually usable brightness levels for a large home theater size screen, or at a resolution at least 1080p.
- nkrebs13 2y ago
  He mentions at the end of the video that potentially multiple projectors could be used to increase brightness. Don't know anything about the tech -- just thought it was an interesting idea.
  - Animats 2y ago
    > multiple projectors could be used to increase brightness. Done in at least one early military large screen display system, using six CRTs (RGB x2) aimed at the screen. If one failed, the brightness dropped on the others but you still had an image. The USAF put a huge amount of effort into early large-screen displays.[1] Not very successfully. The most successful projection display before LCDs was the Eidophor. (1949-2000)[2] Big, expensive, complicated, high-maintenance, but reliable. Worked by distorting an oil film in vacuum with an electron beam. Biggest buyer was NASA's mission control center. In its final 1990s form, it was bright enough to be used in stadiums.[3] [1] https://en.wikipedia.org/wiki/Iconorama https://en.wikipedia.org/wiki/Iconorama [2] https://en.wikipedia.org/wiki/Eidophor https://en.wikipedia.org/wiki/Eidophor [3] https://www.youtube.com/watch?v=5783jPTKzjk https://www.youtube.com/watch?v=5783jPTKzjk
  - js2 2y ago
    Home theater hobbyists do this for sure. Recent example: https://www.avsforum.com/threads/double-stacking-two-epson-ls12000-projectors-for-a-200-projection-screen-experimentation-and-results.3306966/ https://www.avsforum.com/threads/double-stacking-two-epson-l...