Phosphor lag is entrenched in FCC rules. There is no pixel to pixel black to white transition. It takes several pixels to cover a complete transition. Color to color is just as bad. Similarly, there is no true white or black. Blue, green, or red for that matter. Range is limited to 15 to 240, out of 1 to 254. I can understand why to restrict 0 and 255.
CRTs are rapidly being scrapped, but we are still saddled with their legacy.At least for broadcast standards, blurred edges will be here until the FCC stops caring about CRTs.
Rich On 4/20/2013 6:48 PM, John Shutt wrote:
Why would phosphor lag cause a pixel to smear horizontally? It would make it glow when the next frame required complete darkness, that's all. Any smearing of a pixel dot would be due to a misfocused electron beam.The perceived resolution of the B&W CRT would be highest due to there being no shadow mask blocking part of the electron beam, allowing a lower powered and sharper focused beam to produce the same brightness as a higher powered and less focused electron beam in a color CRT. Also, with a color CRT you have three electron beams for the three colors, so any registration error will adversely impact the image quality.For my money, the lack of registration error is what makes a plasma/LCD TV superior to an equivalent CRT.John ----- Original Message ----- From: "TLM" <TLM@xxxxxxxxxx> To: <opendtv@xxxxxxxxxxxxx> Sent: Tuesday, April 16, 2013 6:58 PM Subject: [opendtv] Re: 4KTV at CESSomething I've always wondered about but have no real information on: the differences in perceived H and V resolution between a B&W CRT (the image is smeared horizontally perhaps due to phosphor decay lag?), the RGB triads in early color CRTs (depending on how those little RGB tried are packed and thefact that green has the most energy, but still smeared horizontally,right?), what changes then with the vertical "wires" in the Trinitron, how that changes again with all of the different flavors of flat panel triplets (most of which are rectilinear I believe, right?), shuttered more or less simultaneously (what are the difference refresh characteristics of OLEDs, plasmas and LCDs?), in the latter case - since those triplets are now little rectangles - is there any perceivable difference in resolution when you turnyour head (or the display) 90 degrees?---------------------------------------------------------------------- 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.
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