[Resending with a different From address; the first attempt seems to have vanished. Sorry if it reappears and you get both.] Mr. Stessen, thank you for your very informative posts to the opendtv list. I am intrigued by ClearLCD, and especially by a tantalizing remark you made a while back that we can "have our cake and eat it too", referring to the tradeoff between 60 Hz flicker and 120 Hz judder. I'm not in the business, just an interested consumer who is hesitant to "upgrade" my CRT TV to a display technology with superior spatial resolution but inferior motion portrayal. ClearLCD is the only non-CRT TV technology I've heard of that even attempts to retain the impulse characteristic of CRTs. (Is anyone developing scanning LED backlights? I haven't found anything on the web beyond speculation.) I guess ClearLCD's solution to the flicker/judder problem is related to something called "adaptive dual-pulse" backlighting, but I have been unable to find any details about it. Can you (yet) tell us anything about that? From the name, it sounds like the backlight switches between 60 Hz scanning (one pulse per refresh) and 120 Hz scanning (two pulses per refresh, 180 degrees out of phase, so that two horizontal stripes are illuminated at a time, 1/2 screen height apart), depending on whether the video currently contains any moving objects that the eye might track. When switching from 60 Hz to 120 Hz, does the duty cycle remain the same (the pulse width is cut in half), or does the pulse width remain the same (the duty cycle doubles, and the lamp is dimmed to 1/2 intensity)? What is the pulse width (in milliseconds)? When the backlight is dimmed for dark scenes, is that accomplished by reducing the duty cycle or the intensity? If the pulse width is 4ms (I'm guessing based on various imprecise statements I've found), that's a lot better than a full frame time of 17ms, but still a far cry from a CRT, where the phosphors have largely decayed after 0.1 ms and almost completely decayed after 1ms (right?). If something moves the full width of the screen in two seconds (which I wouldn't call especially fast), that's one pixel per ms, so a 4ms pulse would blur away about 3/4 of the horizontal resolution of the moving object (versus 16/17 for an always-on backlight, versus almost no blur for a CRT). Is work underway to further reduce the duty cycle? By the way, why is 60 Hz flicker a problem? I've been watching NTSC TV all my life, and never noticed a flicker (and still don't). But I can see the flicker on a CRT computer monitor set to 60 Hz refresh. What's the difference? Thanks for any explanations you can offer, AMC ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.