sailordude said: they really dont make the SXRD anymore?! |
Nope. When the SXRD came out, the color wheels in DLP were to slow to properly do 1080p. They were also only 3 colors. They sped up the wheels and added a few colors to it.
In a 1080p DLP TV, there is a grid of mirrors that are 1900x1080. One for each pixel. If it's on, it sends light to the screen, it it's off, the light passes through it and hits the bottom of the TV. It quickly turns on and off as the color wheel spins, to put the right amount of time for each color on the screen so your eye can mix it. So if you want green for example, it will stay lit while the yellow and blue passes by, and turn off for the red. Your eye sees, at a very very fast rate of yellow and blue swapping back and forth, and tells you it sees green. If they want a richer blue-green, the light stays on longer for the blue. If you wan the color to be darker, it stays on shorter for each (so you get less light). With these kinds of techniques, they can produce any color.
For LCoS, there is a prism in your TV that breaks the colors into three primary colors, and then runs them pass three independent 1900x1080 grids. The grids block a certain amount of light, based on the color you want. So for the green example above, the display that red is hitting let's no light through, and the blue and yellow ones let all the light through. If you want more blue-green, the yellow one will let less light through. These three beams are then mixed back together and displayed. The color is premixed, and for the entire time, the pixel is actually green. No need for your eye to mix anything.
In theory, the LCoS is still better, as it mixes the color before the pixel hits the screen, the pixel for DLP is one of the 5 colors of the color wheel for a set amount of time, and your eye mixes the color for you.
LCoS has three 1900x1080 displays in it (one for each color), where as DLP only needs to have 1. It makes our TV's heavy (adds to shipping costs), and cost more to produce.
in the end the picture looks the same, as your eye does a good job of mixing the colors. It's more a purists point of view that LCoS is better technology, not really an image thing. Both are better then LCD, as when you want black, it's truly the absent of all light, and is really back. In LCD, your still send energy to the pixel to represent the color black, and it turns out gray. The newer TV's are a lot better, but LCD will probably never be able to produce real blacks.
That's where the next technology comes on, OLED TV's :)
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