Re: Luddites
- From: "Leonard Caillouet" <no@xxxxxxxxx>
- Date: Wed, 17 Aug 2005 14:19:57 -0400
"Matthew L. Martin" <nothere@xxxxxxxxxxxx> wrote in message
news:11g6qt2t5b77c61@xxxxxxxxxxxxxxxxxxxxx
> Doug McDonald wrote:
>> Sal M. Onella wrote:
>>
>>> Mechanical TV did last, in a way, into the 1970's. The first color TV
>>> camera on the moon
>>> had a spinning color wheel, a la the CBS color system, circa 1950.
>>>
>>>
>>
>> Mechanical TV, with spinning color wheels, is very alive and very well,
>> TODAY. It is called "DLP". It probably will eventually succumb
>> to Moore's Law, when the chips become cheap enough to use three of them.
>>
>
> It's not just the chip count that makes the color wheel cheaper.
> Mechanical registration and optics able to reduce convergence errors in
> three chip implementations also add to the cost.
>
> --
> Matthew
>
> I'm a contractor. If you want an opinion, I'll sell you one.
> Which one do you want?
The optical path from the lamp to the chips is much more complex. You have
to split the lamp output and filter it. A typical light path has dichroic
mirrors polarizers, color filters, UV filters, lenses...about a dozen
optical components. They can get dirty and can fail (usually heat and/or UV
damage in the Blue filter path). The color wheel with one chip is a rather
elegant solution if it is built well. If you don't see rainbow or streaking
effects, I'd say it is preferable for most applications.
Leonard
.
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