On 3/12/07, Daniel Rozsnyó <[EMAIL PROTECTED]> wrote:
Dieter wrote:
> Found an interesting article that explains why LCD monitors continue
> to suffer "ghosting" despite faster and faster switching times.
>
> http://www.xbitlabs.com/articles/other/display/lcd-parameters.html
>
> Solution appears to be adding flicker to reduce ghosting. :-(
> Keeping the flicker from being a problem will likely require
> higher refresh rates, just like CRTs. At 60 Hz, a single link
> DVI can do up to 1080x1200, but with higher refresh rates,
> we'll need dual-link.
Why you want to send 120Hz to the display if it will actually replace
each other frame with black ?
Rather use a buffer in the monitor to double the scanrate before the
image goes to the LCD, in the same was as the 100Hz tv sets do.
There are two methods of reducing motion blur on LCD monitors that I
have read about. The cause of the blur is the sample-and-hold
property of the display. The eye sees both the old and the new images
at once. With a CRT, there is a low duty cycle on the real glow of
the phosphor, and the eye/brain fill in the gaps, inferring motion
that isn't really there.
One method is to flicker the back-light. Using LCD backlights, you
can get really good results, particularly if the backlight is rotated
in zones, so you can maintain a higher duty cycle than a CRT, giving
you less perceptible flicker.
Another one is by Klompenhouwer:
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=DTPSDS000035000001001340000001&idtype=cvips&gifs=yes
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=DTPSDS000037000001001700000001&idtype=cvips&gifs=yes
He mathematically modeled the transfer functions of the CRT, the LCD,
and the human eye then developed a method of applying the inverse
transfer function of the LCD to compensate. The nutshell version is
that you amplify the higher frequency components of the motion video
in the direction of motion. This assumes that the eye is tracking the
moving elements. I also remember him mentioning someting about
"saccades".
--
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Favorite book: The Design of Everyday Things, Donald A. Norman, ISBN
0-465-06710-7
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