The video discusses how TVs work, specifically focusing on the illusions of movement and color. The host, Gavin, explains that our brains are tricked into seeing movement when in fact we're just watching still images shown rapidly. He demonstrates this using high-speed footage of a CRT TV and an LCD TV, showing how the scan lines move from top to bottom and how the pixels are updated.
Gavin also explores the illusion of color, explaining that pixels are made up of three sub-pixels (red, green, and blue) that are dimmed or brightened to create different colors. He uses a macro lens to show the sub-pixels up close and demonstrates how the colors are created.
The video also compares LCD and OLED screens, with Gavin noting that OLED screens have self-illuminating pixels and do not require a backlight, resulting in deeper blacks and thinner screens. Overall, the video provides a detailed and technical explanation of how TVs work, using high-speed footage and macro photography to illustrate the concepts.
Here are the key facts extracted from the text:
1. The video is about how a TV works in slow motion.
2. The host, Gavin, is using an 85-inch LCD TV for the demonstration.
3. When watching a film, 24 images are shown every second.
4. When playing a game, 30 to 60 frames are shown per second.
5. A PC can show hundreds of frames per second.
6. A CRT TV is incapable of showing one image and then switching to the next image 1/24th of a second later.
7. The shutter speed of a camera can be out of sync with the refresh rate of a screen.
8. A CRT TV's frame is constructed from top to bottom multiple times per second.
9. The refresh rate of a CRT TV is 60 times per second in the US (60 Hz).
10. High-speed footage of a CRT TV screen can show the scan line moving from top to bottom.
11. On a CRT screen, only the active line of pixels is bright.
12. The persistence of vision builds the active line of pixels into a complete image.
13. A CRT TV can draw an image line by line from top to bottom.
14. A faster camera is needed to see that each line is drawn from left to right.
15. At 28,500 frames per second, it is possible to see glimpses of the line being drawn from left to right.
16. At 118,000 frames per second, the line is being drawn from left to right on the screen.
17. The line is being drawn from left to right on the screen at 146,000 frames per second.
18. A modern LCD screen is not only the active line of pixels that retains brightness, it's the entire image.
19. The entire image on an LCD screen is visible as each scan line passes down the screen.
20. The startup sequence on an Xbox One can be recorded at every frame.
21. The illusion of movement on a TV is created by showing multiple images per second.
22. The illusion of color on a TV is created by using red, green, and blue sub-pixels.
23. A pixel is made up of three sub-pixels: red, green, and blue (RGB).
24. The RGB sub-pixels can be dimmed and brightened to different intensities to create the illusion of different colors.
25. An LCD screen can create the illusion of millions of different colors when all three sub-pixels are lit to full brightness.
26. When all three sub-pixels are dimmed, the result is black.
27. When all three sub-pixels are lit to full brightness, the result is white.
28. The sub-pixels on an LCD screen are backlit by fluorescent tubes or LEDs.
29. The backlight on an LCD screen is always on, even when the image is black.
30. OLED (Organic Light Emitting Diode) screens have self-illuminating pixels that do not require a backlight.
31. OLED screens can produce true blacks because each pixel can be turned off individually.
32. The LG OLED TV used in the demonstration is a 77-inch model.
33. The OLED TV has individually controlled pixels that can be turned on and off.
34. The OLED TV does not have a global backlight.
35. The OLED TV can produce much deeper blacks than an LCD TV.