I'm not entirely sure but I would guess it has to do with keeping costs down ... I would imagine the DLP chip is the most expensive part in the setup and since DLP is marketed as a "lower end" display (lower end not necessarily meaning quality of display but cost) and making a three chip design would increase that too much.
That being said, there are some three chip dlp's on the market. Mostly used in projectors, but I think there are some tv's on the market that use a 3 chip design. Another thing that manufactures tote is that by upping the color wheel to 5+ colors, they can produce more natural colors then a 3 chip (and in turn 3 color) design which may or may not be true.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Q: Why are most if not all LCoS/SXRD 3 panel based while they are still stuck in the one panel + colour wheel for DLPs.
In response to Smeagol
I'm not entirely sure but I would guess it has to do with keeping costs down ... I would imagine the DLP chip is the most expensive part in the setup and since DLP is marketed as a "lower end" display (lower end not necessarily meaning quality of display but cost) and making a three chip design would increase that too much.
That being said, there are some three chip dlp's on the market. Mostly used in projectors, but I think there are some tv's on the market that use a 3 chip design. Another thing that manufactures tote is that by upping the color wheel to 5+ colors, they can produce more natural colors then a 3 chip (and in turn 3 color) design which may or may not be true.