General > General Technical Chat
An expensive TV is a poor investment, and people spend FAR too much on them
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tooki:
There aren’t any distribution standards for HDR cinema.

But with the comparatively low contrast of projection screens it barely matters.
tom66:

--- Quote from: tooki on February 09, 2022, 09:44:36 pm ---”Plenty good” is a wild understatement. I recently discovered that one local cinema has (for a few years already) one of the first direct-view LED screens in the world; a high quality 4K video wall, basically. And in one of the articles I read about it, it mentioned that home TVs have been better than cinema projectors for a long time. I think people forget just how much projectors suck, and underestimate just how good typical modern LCD panels are. And OLED (and direct-view LED) are better still.

--- End quote ---

Would love to see one of these in person.  Some older direct-view LED displays look pretty awful, but I've noticed a marked improvement in their performance now.  Cinema will be a true challenge.
tooki:
Yeah, I’ve been meaning to go see a movie there so I can form an opinion on the screen. Given how good modern video walls are (at least high-quality ones), I expect it to look great.
bw2341:
There's a high end LED video wall at my local Apple Store and I was able to walk right up to it. Very impressive. The light modifiers blend the LEDs together very well so I was not able to discern individual LEDs. Even though the display faces the outside glass curtain wall, there was plenty of contrast in the image. They were using it for the in-store teaching sessions. This was in The Before Times, of course.

Linus of Linus Tech Tips considered acquiring Samsung's The Wall MicroLED display as the ultimate YouTuber showoff piece. He was dissuaded from moving forward for multiple reasons. Experienced installers informed him of the extreme power, cooling and building structural requirements. Also, frequent replacement of modules due to failure is to be expected. In fact, the sell sheet for LG's competitive product mentions the inclusion of on-site spares in the package.
bw2341:

--- Quote from: tooki on February 09, 2022, 09:44:36 pm ---Projection varies wildly, depending on the type of screen. High-gain screens have distracting reflection patterns. :/

--- End quote ---

This is probably an artifact of 3D capable theatre screens. Most theatres use circular polarization optics to project the separate left and right eye images. The screen material has to retain the polarization of the incident light when reflecting it back to the viewer. Otherwise, there will be crosstalk between the left and right eye images. The screen has to be high gain so that the image is acceptably bright through the 3D glasses.
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