Lee Shankman
Grip
- Joined
- Nov 1, 2000
- Messages
- 21
Hello all
Today, as I was checking out the Toshiba DLP rear projection TV I want to buy. I understand the 'rainbow' effect caused by the color wheel, but what I was thinking about was the idea that a pixel can be only 'on' or 'off' in DLP, not partially on for fractional brightness. This led me to wonder how DLPs resolve different levels of brightness -- a smooth grayscale, for example. I suspected that they must use a dithering algorithm or perhaps a pulsating that is quicker than the framerate.
On close examination and comparison with LCD units nearby, I feel that LCD is far superior in its ability to resolve subtle differences in levels, especially in shadows. I saw annoying dithering in dark areas, and the same dithering in bright areas when panning across the frame. None of this artifacting was apparent on the LCD units. I am not wondering if I'll be happy with the DLP unit. What is actually the benefit of DLP? I don't like the rainbow effect, and I really don't like the dithering phenomenon I'm seeing. I know those DLP chips must be doing a heck of a lot of work, changing so quickly (it must have to change at least 3x per frame, right?), but it seems to me that the picture still needs some work.
Thoughts?
Thanks...
Today, as I was checking out the Toshiba DLP rear projection TV I want to buy. I understand the 'rainbow' effect caused by the color wheel, but what I was thinking about was the idea that a pixel can be only 'on' or 'off' in DLP, not partially on for fractional brightness. This led me to wonder how DLPs resolve different levels of brightness -- a smooth grayscale, for example. I suspected that they must use a dithering algorithm or perhaps a pulsating that is quicker than the framerate.
On close examination and comparison with LCD units nearby, I feel that LCD is far superior in its ability to resolve subtle differences in levels, especially in shadows. I saw annoying dithering in dark areas, and the same dithering in bright areas when panning across the frame. None of this artifacting was apparent on the LCD units. I am not wondering if I'll be happy with the DLP unit. What is actually the benefit of DLP? I don't like the rainbow effect, and I really don't like the dithering phenomenon I'm seeing. I know those DLP chips must be doing a heck of a lot of work, changing so quickly (it must have to change at least 3x per frame, right?), but it seems to me that the picture still needs some work.
Thoughts?
Thanks...