Gavin from The Slow Mo Guys explains how TVs work in slow motion. He starts by comparing an 85-inch LCD TV to an old CRT TV, showing how the CRT screen builds an image from top to bottom, line by line, using high-speed footage. He then shows how a modern LCD screen works, with the entire image retaining brightness, and how it can be manipulated to show individual pixels and sub-pixels.
Gavin also explains how the screen creates colors by dimming and brightening different sub-pixels, and how this creates the illusion of millions of different colors. He then compares an LCD screen to an OLED (organic light-emitting diode) screen, which has self-illuminating pixels and no global backlight, resulting in deeper blacks and a thinner screen.
Throughout the video, Gavin uses high-speed footage and macro lenses to show the inner workings of the TVs, and provides examples of how the technology is used in everyday life.
Here are the key facts extracted from the text:
1. The video is presented by Gavin from The Slow Mo Guys.
2. Gavin is discussing how a TV works in slow motion.
3. The TV used in the video is an 85-inch LCD TV.
4. When watching a film, 24 images are shown every second.
5. When playing a game, the frame rate can be 30 to 60 frames per second, or even 100s on a PC.
6. A CRT TV uses a cathode ray tube to display images.
7. The frame on a CRT TV is constructed from top to bottom, multiple times per second.
8. The refresh rate of a CRT TV in the US is 60 Hertz.
9. Gavin used a high-speed camera to capture footage of the TV screen.
10. The camera captured footage at 1600 frames per second, then 2500 frames per second, and eventually 380,000 frames per second.
11. At 380,000 frames per second, each line of pixels can be seen being drawn from left to right.
12. The resolution of the CRT TV is 256 by 128 pixels.
13. The resolution of the LCD TV is 3840 by 2160 pixels, which is over 8 million pixels.
14. The processing power required to update an image that big that many times every second is significant.
15. On a modern LCD screen, the entire image retains brightness, not just the active line of pixels.
16. Gavin used a macro lens to capture footage of the TV screen at the sub-pixel level.
17. A pixel is made up of three sub-pixels: red, green, and blue.
18. The sub-pixels can be dimmed and brightened to different intensities to create the illusion of different colors.
19. The screen can create the illusion of millions of different colors by combining the sub-pixels.
20. When all three sub-pixels are lit to full brightness, the result is white.
21. When all three sub-pixels are dimmed, the result is black.
22. The LCD TV is backlit by LEDs, which are thinner than the CCFLs used in older LCD TVs.
23. The backlight is always on, even when the pixels are dimmed, which can cause light to leak out from black pixels.
24. This can result in a "not true black" effect, where the black pixels appear more like a dark gray.
25. OLED screens, on the other hand, use self-illuminating pixels that can be turned on and off individually.
26. This means that OLED screens do not require a global backlight and can produce true blacks.
27. LG supplied Gavin with an OLED TV for the purpose of making this video.