Sorry for responding to such an old thread but I was doing a google search on subfield informantion and found this thread with an old question addressed to me and an incorrect response.
Originally Posted by Lessard
Do you know if different subfields could be combined during a frame ?Imagine I want a luminosity of 52 so I enable the subfield SF14 (which has a value of 39) and the subfield SF6 (which has a value of 13).
In the graphic above which is Pioneer C.L.E.A.R driving there is no possible way to only combine SF14 with SF6. With CLEAR driving the subfields must always be sequential (one after the other)
In Panasonics case, they use binary driving, which allows for non-sequential selection of sub-fields. In other words in Panasonics case, yes, they can combine whatever subfields they want.
- subfields can "only" be sequential (one after another)
- subfield weights can be altered during operation
- 8 subfields = 8 gray levels for Pioneer
Panasonic (REAL BLACK)
- Any subfield combination is possible
- subfield weights cannot be altered
- 8 subfields = 256 gray levels for Panasonic
= Another question : do you know if all the cells are synchronized ?
For example during the first 0.1 ms I can enable only the SF1 subfield of all the cells which need it, and after that and during 0.3ms I can enable only the SF2 etc.
In most cases, the subfield position in time never changes relative to other pixels. So yes they are always synchronized in time.
Exception : Pioneer "advanced CLEAR" driving uses a scan type display mode where several rows of pixels are addressed while others are displaying light. They do this in a CRT type line by line fashion.