[Open-graphics] ATI and Nvidia raise the bar?

[Daniel Rozsnyó]

It seems that twinkling is the result of overdrive technology which is 
the technology which draws the following frame with an increased 
difference, to force the LC to move more quickly ( = increase the 
response time), but the effect is, that it creates little flashes. 
Values sent to the module:

normal drive: 000055555
overdrive:    000075555

The 0->5 in normal (old) LCM does not make twinkling but the change is 
slower and might span over few refreshes. In the second, the 0->7 makes 
the cell to charge faster, but when the value is not correctly 
calculated, the screen becomes for the rest of that frame lighter 
("little flash"). I suppose that is twinkling.

To calculate the correct overdrive value, you need double-buffering and 
compute integrals. Also, 6 or 8 bit resolution might not be enough for 
precise overdrive.


Dieter wrote:
> So ATI and Nvidia now have noise and sharpness filters.
> Perhaps I missed it, but I didn't see anything about whether this
> is done in hardware or in the driver.  I also haven't seen an
> explaination of exactly what this "twinkling" is and what causes
> it.
> 
> http://www.behardware.com/articles/635-1/ati-and-nvidia-corrects-the-twinkling-effect-of-lcds-in-movies.html
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