Originally Posted by thepoohcontinuum
I'm not refuting what you said, but lets say your source material is generally devoid of dark colors and more on the white side (ex., typical PC desktop usage), would increasing the backlight to make whites whiter be the wrong approach? This is the approach I've been using, since adjusting brightness/contrast makes colors duller, whereas backlight gets whites whiter but still keeping colors vibrant.
Well, first it's only a matter of preference to some extent, but yes, generally increasing backlight will make white very white with the additional right IRE settings. Especially if "Medium" color temp is use as some prefer. Now that being said setting backlight in the 60's to 80's still has it's consequences and that will be lot's more light leakage on an all "black" screen. I'm sure you know pretty much how an LCD panel works, but for the audience, the LCD pixels act like light valves either allowing the back light to show, or blocking it; and various levels in between.
The problem is that when the pixels are blocking the back light source they can only do it to a certain level based on the technology of the panel. In most cases just for the sake of the discussion, it would be a VA or IPS panel. Either of them offer a fairly good black level, but only within reason. The higher the back light level, the more light will leak through on a "black" screen or area. White will surely be bright, but black will suffer and be more "gray". But it also depends on ambient light in the room and any light that might be directed to the screen. Ambient light will mask light leakage to a degree and result in an altered black level that our eye perceives. In other words, higher ambient light will make the TV black level appear better than it is to a degree.
As far as colors being "duller" I guess it depends on point of view to some extent. If a TV is calibrated to a "warm" 6500K color temperature colors and over all light output will be more subdued or what is called "natural". That doesn't mean everyone will like it. But, a TV picture can only display an accurate
color palette within a certain light output based on it's design and choice of internal components and LCD panel. The TV needs to operate within the linear gamma region it is capable of for accurate
color and light output. Generally, a TV calibrated at 6500K "warm" will have more depth to image appearance, images and light variations will seem more 3D, and flesh tones will usually be more natural. Now, if an owner wants a super bright picture, leans towards the cooler color temperature, then, sure an overall brighter picture can be obtained. I am no video "purist" and I believe an owner should use a picture setting that pleases his/her taste. . . mmm, within reason. A high back light level, for instance, also shortens back light life and consumes more energy. That may not matter to an owner, so again, preference. But from what I have seen in the LD line of TVs, operating higher than 25 to 40, unless using the Energy Saving option, does result in a trade off of optimum black level.
When all is said and done, I guess I say this. I usually tell people and new owners of an LCD TV, for normal TV viewing of DVD/BD, broadcast network OTA sources, and/or cable or satellite; that the picture should look as close like the image is right there in the room with them or outside their window. I tell them about ambient light and its affects on the TV picture. And then let them decide what they want. Lastly, I will say this. Some of it depends on what an owner's eye has grown used to. If an owner previously only had an older CRT TV, stares at a computer monitor a lot of the day, or is used to a lot of CGI images as in gaming; they will generally perceive a warm, 6500K calibration as "dull". And there's nothing wrong or right about that. It's just a choice, but it should be an educated choice with an understanding of the trade offs and benefits.
Boy, that was longer than I wanted, but I tried to put this in non technical terms and also not offend anyone's personal choice either.