Threre's no any reliable way to adjust LED brightness in DC mode. You'll get very low power efficiency and very narrow brightness adjustment range.

Samsung should increase switching frequency, 1 kHz should not be a problem, but DC mode absolutely is not an option.

Also, they promised to send me more refined sample soon, the one that will go into mass-production this summer. Yet they didn't tell what has been fixed in it.

A 6-bit LCD will not display all the colors of a photograph because it is not physically possible. If you trick the brain into thinking there is another or new color by flashing it for a certain time, then it is possible with out being limited by the physics. Only very fast responsive LCD can do this.

Some computer monitors and TV includes higher precision electronics when capturing analog video. My computer monitor NEC Multisync EA231WMi includes 12-bit resolution for VGA. The quality of it closely resembles DVI-D. The precision electronics does not work with DVI-D, HDMI, and DisplayPort. These connections are more like monkey see, monkey do. Of course there might be some post processing.

If you are explaining about a 10-bit LCD panel, you will need to buy workstation video card and use software that supports 30-bit color. A 10-bit panel only helps when everything supports 30-bit color. When nothing does, you get the amount of colors the rest of us see on our computer monitors which is 24-bit color.

Color shifting only occurs when you do not know what you are doing while calibrating the monitor. Each screen is different how it is calibrated. Color banding occurs when the colors that you are using in a graphic can not be duplicated on a monitor. Color banding can be cause by poor post processing.

It seems you tried to outsmart me, without actually thinking about what I've explained. And you are wrong on several accounts.

TN panels (and some cheaper IPS recently) that are natively 6-bits per component use a method called FRC since ages to effectively add 2 more bits per component. Most IPS and VA monitors that are natively 8-bit per component does the same to have effectively 10 bits (and this time the changes are more subtle so much less noticeable). What's new with those new 10-bits panels that those are natively have 10 bits.

But as I said, I wasn't talking about this, but that most mid-to-high range monitors process and display images effectively at 10+ bits per component, using dithering for the latter. It's neccessary because without this the little changes to the displeyed tones would round itself to the 256 levels the 8-bits of precision allows, causing banding and (subtle but noticeable) decolorization of certain shades. I hope you can understand this already.

You can test it this way:
1. Run the EIZO Monitortest, go to page 21. It's a fine gradient. Use 256 levels, preferably white/gray or green.
2. Turn down the contrast (not brightness of backlight!) to half.

Now, just take a look how many levels you have now?

On an all-8-bits monitor it would halve the steps in the gradient as at 8 bits of precision you can only have 128 values low to mid, out of the original 256 of the full range. Get it?

But, what you see on a NEC EA231WMi (that I have, too)? The 256 levels remains, just darker! Voilá! If you look closer, you can see the dithering, as well. (More noticeable on darker shades.) You will get the same with many mid-to-high range monitors, despite their 8-bits panels.

Now, try it with the Samsung F2380 - which is a 24-bits one, I mean really an all-8-bits one... And I could tell some more, like this. (And, BTW, not even try it with a regular TN based one.)

It's also not true that one can have 10 bits/compontent only out of workstation video cards, as since the AMD HD5000 series the cards can send out 10 bits per component out of the 16 bits per component of the calibration LUT, in case the monitor can receive it, as well. (Sadly the 231WMi can't, but f.ex. the Dell U2410 can!) Just you cannot display an 30-bits image out of the _frame-buffer_. [Unless you deploy certain tricks - don't forget the workstation cards don't really have unique chips, they use the same as used on higher ranged PC videocards...]