Originally Posted by curiousdude
I thought 735 has no uniformity issue. If 735 with full array has uniformity issue, why do you think they will be able to fix uniformity on the edge lit 847U?
Let me preface by saying that I don't know the exact cause of the clouding and DSE on the 700 series sets...and by saying that the two LCD sets I already own have very good uniformity; one being an older Bravia CCFL and the other being edge LED
I do have a fairly decent understanding of LEDs, though.
Typical mass production binning (sorting by color, brightness, etc) on LEDs is fairly coarse in this context. With the relative low price point of the non-elite full array models, I'm assuming they aren't paying for high precision binning and driver circuits so the backlighting could vary visibly from section to section and even diode to diode. The sheer number of diodes clustered closely together and viewed directly would tend to pronounce any minor variation in the illumination characteristics. (Sharp manufactures LEDs by the way)
With edge lighting there are fewer diodes, they are not viewed directly, and the mixing effect of the diffuser is stronger so binning and driver variations play a lesser role in lighting characteristics. As long as the diffuser(s) allow for good uniformity from "edge" to "center" the backlight as a whole would seem more likely to be uniform.
Based on the experience with my current sets, it seems to me that designing and manufacturing a good edge diffuser is less expensive and easier than full array.
Whether or not it can be effectively done on a 70 screen is my concern.
Hope that makes sense. If not, I can try to clarify later.