|Originally posted by rd001
I'd like to see Sony state explicitly that their high-end fine-pitch tubes actually resolve and display these 1400x1080 pixels. This should be a verifiable fact. And yet, they don't seem to claim it.
There are many parameters of a TV set that are difficult for a layman to measure. The aperture pitch is not one of these. Anyone can take a ruler and a magnifying glass and count the number of red stripes that traverse an inch's worth of ruler and then estimate the number of red stripes that span the full width of the CRT.
All HD ready sets resolve and display 1080 lines vertically. Each transmitted line is discreet.
Can a high-end fine-pitch tube resolve and display 1400 pixels horizontally?
Of course it can because the electronics have a video bandwidth of over 30 mhz. and if your goal was to turn on every second pixel of the 1400 while scanning horizontally, then you would only have to feed the CRT gun with a 23 mhz sine wave, this being well within the set's capabilities.
23 mhz is calculated by allocating one cycle of sine wave for every 2 pixels horizontally, so 1400 divided by 2, times the horizontal scanning frequency of 33 khz gives approximately 23 mhz. Most HD analog signals leaving a STB rarely do better than 15 mhz, slightly better than progressive DVDs at 13.5 mhz.
Additionally, the electron beam has to be focused sharply enough to only illuminate an area of phosphor about a half a millimeter by a half a millimeter. When Sony first introduced their high pitch tube, they also advertised the fact that their electron guns had sharper focusing than previous generations.
In my books, the XBR960 has all the cookies to deliver a 1400 by 1080 image, and then some.