3 ms·
That's not true at all. Black on a projector is still projected light, especially with a DLP which have the worst contrast ratios of the 3 projector types (DLP
by SirMaster 2y ago
That's not true at all. Black on a projector is still projected light, especially with a DLP which have the worst contrast ratios of the 3 projector types (DLP, LCD, LCoS).
What he is making here is a dual panel display. There are actually some LCD monitors that use this concept of 2 separate panel layers each providing their normal contrast resulting in a multiplicative effect.
For the video posted here, the DLP is probably at best 1000:1 and the cheap old LCD is also maybe about 1000:1, so you get about 1 million:1 which is a lot, but not technically infinite like self-emissive display that can turn off the pixels completely for sections of the picture like OLED and microLED.
- Dylan16807 2y agoWhat makes self-emissive "technically infinite" but not DLP? I would say the weak point of DLP is the screen material needing to be light-friendly, but that's on a sliding scale with the emissive display, not a hard line difference. Both of them preserve black levels when turning on, unlike traditional LCD, but also it isn't true black for either of them.
- SirMaster 2y agoLCD projectors do better at contrast than DLP though. For example the Epson 5050UB or LS12000 do about 5000:1 native contrast. Most DLPs around the same price level are in the 1000:1 to at most 2000:1 contrast level. A DLP is nothing like an emissive display. The entire area of a projected image with any projector is always lit up by the light source. Any projector, including DLP is like a TV with a single backlight and no local array dimming. Here are some simple photos of DLP projectors and here you will clearly see that the black parts, like the black bars above and below the cinemascope image, or even the spill over past the edges of the panel are not black at all. https://i.redd.it/ak3lwsumvccc1.jpeg https://i.redd.it/ak3lwsumvccc1.jpeg https://preview.redd.it/eyc62402amnd1.jpg?width=4000&format=pjpg&auto=webp&s=a738a2adb4e1f96857b97fe0a9c6fb3cbedfff67 https://preview.redd.it/eyc62402amnd1.jpg?width=4000&format=... In that second photo, the odd shape of the black projected area is due to the user using keystone, so the image is not being displayed on that part of the imaging panel and it's just left black, but you can see then what the black level really is for projected "black" pixels.
- Dylan16807 2y agoMy mistake then. How is there so much light going the wrong way from a mirror?
- adgjlsfhk1 2y agoMirrors aren't perfect. Some percent of the light will hit a microscopic deformation and scatter. You only need ~1 part in 1000 to scatter for it to ruin your contrast ratio.
- Dylan16807 2y agoWell, has to not only scatter but go toward the screen.
- its-summertime 2y agohttps://www.rtings.com/projector/learn/research/launch-article https://www.rtings.com/projector/learn/research/launch-artic... probably better info about it, its far more complex than just, A > B
- tshaddox 2y ago> Black on a projector is still projected light, especially with a DLP which have the worst contrast ratios of the 3 projector types (DLP, LCD, LCoS). If DLP has worst contrast than LCD, then why would this project be even remotely successful? Wouldn't the LCD layer in the stock LCD TV would have already been more effectively blocking the light from the stock backlight?
- Miraste 2y agoYou're missing that the LCD is still there. It's still blocking just as much light as it originally did, but now the DLP chip is also blocking light. The effect stacks.
- tshaddox 2y agoI suppose so, but is that fundamentally different from just putting two LCD layers (from two identical TV) in front of the backlight?