Hmmm. I find your answer unsatisfying. Although a CRT lights each
pixel with an electron beam sweeping across the phosphors the beam is
moving at an extremely fast rate. So fast that it hits every single
pixel once every 16.7 ms if the refresh rate is 60 Hz and faster than
that if the refresh rate is higher. Obviously, the phosphors have to
have a persistence at least as long as 16.7 ms else they'd go dark
before the beam came around again... that awful flicker.
But my question is, how can a monitor have a "response rate" (whatever
that is) of 2 ms or 5 ms of anything less than the refresh rate? It's
the refresh rate that's controlling how fast each pixel changes
regardless of whether they're updated sequentially with a super fast
beam or nearly simultaneously via addressable solid state electronics.
Chuck Norcutt
Jeff Keller wrote:
> A CRT displays a single active dot of light moving across the screen.
> It's been a very long time since I paid any attention to the inner
> details, but a LCD displays and updates much more than a single dot at
> any one instance. The affects of persistance are much different.
> -jeff
>
> On 9/27/07, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>> This raises a question in my mind. I know that LCD's were initally not
>> considered good for fast moving games because of persistence. But I see
>> some now claiming 2 ms or 5 ms response times in the specs. But a 60 Hz
>> refresh rate is almost 17 ms. How does this work?
>>
>> Chuck Norcutt
>>
>> Ian Manners wrote:
>>> Just to let you all know that the 'refresh rate' of LCD's is not as
>>> important as with CRT displays.
>>>
>>> Why ?
>>>
>>> Persistance.
>>>
>>> CRT's have a very low persistance which is why flickering is
>>> more evident than on LCD screens, which hold the switch
>>> voltage a lot longer.
>>>
>>> Cheers
>>> Ian Manners
>
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