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The Slow Mo Guys does an episode on how a TV works up close.
This thread has 6 replies. Displaying all posts.
Post 1 made on Thursday January 18, 2018 at 16:02
King of typos
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I figured that some of you guys would enjoy a video like this. Especially with the fact that they show the old school CTR, and LED back-lit as well as OLED.

Not sure why he showed the OLED up close with a red cursor only as compared with a white image as well. It is weird how the green and blue LEDs have more of rounded edge than the red... But that could be because of the image.

[Link: youtu.be]

KOT
Post 2 made on Thursday January 18, 2018 at 21:20
Ranger Home
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great watch!
Post 3 made on Friday January 19, 2018 at 15:24
Ernie Gilman
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It sure is!
Somehow I had learned that CRT lines persist, and the eye persists, and all that together unifies the lines into an image. This shows that the entire screen is dark except for the line that's being drawn (and maybe one or two before it) but not the entire screen.

I wish he had addressed the fact that our brains modify the optical input somewhat. Imagine an image projected onto a wall painted white. There's enough ambient light to see that there's a wall there... and that's the darkest black you'll ever get in an image. But when you actually project an image up there, black places inside the image look darker than the wall surrounding the image. Bright places make the unlit portion of wall look darker than they are!
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 4 made on Saturday January 20, 2018 at 13:13
slobob
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Yep, most people, and even "How it's made shows" forget about the "presistance of vision", phosphor decay, and how the human brain averages light intensity over a given field.... all was figured into the original TV system (when engineers knew what they were doing AND the limitations of what they were working with). The human being and how we work has to be taken into account when any system is designed. All interesting
Post 5 made on Saturday January 20, 2018 at 19:40
Ernie Gilman
Yes, That Ernie!
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Reading slobob I just remembered that after the drawbacks of NTSC color became known, and Europeans developed a system (PAL) that worked with 50 Hz power, the Euros would sometimes refer to NTSC as "never twice same color," slamming the color performance of NTSC.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 6 made on Saturday January 20, 2018 at 20:07
Fins
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On January 20, 2018 at 19:40, Ernie Gilman said...
Reading slobob I just remembered that after the drawbacks of NTSC color became known, and Europeans developed a system (PAL) that worked with 50 Hz power, the Euros would sometimes refer to NTSC as "never twice same color," slamming the color performance of NTSC.

Here’s a comparison of NTSC, PAL and SECAM

[Link: durofy.com]
Civil War reenactment is LARPing for people with no imagination.

Post 7 made on Sunday January 21, 2018 at 13:01
andrewinboulder
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Very interesting.

When talking about light, some of you may have seen this. It's so many frames per seconds you can actually see photons of light move through a bottle.

[Link: youtube.com]


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