A Guide to Choosing the Right 19" LCD Monitor - 7 Models Reviewed
by Kristopher Kubicki on November 30, 2004 12:04 AM EST- Posted in
- Displays
How to Pick a Good LCD (continued)
Color Depth: Almost all LCDs today are 6-bit or 8-bit LCDs. This means that each subpixel - Red, Green, and Blue - can display one of 2 to the n shades where n represents the number of pixels. A typical 8-bit LCD can produce 256 shades per pixel, or 16.7M color combinations. A 6-bit LCD panel can display 64 shades per subpixel, and since there are three subpixels per pixel, the monitor can display 262,000 color combinations per pixel. This is generally OK for gaming, but certainly not acceptable for any graphics development. Personally, I enjoy seeing the other 98% of the 24-bit color spectrum.Brightness: Brightness is fortunately an easy specification to remember. More is better, particularly on LCDs with higher resolution. Even though your LCD might have six bulbs behind the substrate, a very small fraction of that light actually filters through the liquid crystal. Although, the measurement of "candela per meter squared" or "cd/m2" or "nits" all refer to the amount of light that actually passes through the front of the monitor at a 90 degree angle.
Viewing Angle: Viewing angle generally has a lot to do with the display mode of an LCD. You may wish to check out our LCD FAQ from a year ago that went through a lot of the basics of LCD design, particularly the pages on how LCD substrates work. Differing display modes utilize differing methods for twisting the LCD crystals - TN, PVA and SIPS are just a few. When LCDs were new, there were large issues with getting light to pass through the substrate at more angles than just 90 degrees head on, and for a short period of time, it was important that LCDs have some viewing angle. However, almost all LCDs today (and for the last 3 years or so) have viewing angles that are wide enough for anyone to look at the LCD from any (sane) angle. Unless you spend a lot of time looking at your monitor from 3 feet away, 60 degrees off center and at a 45 degree incline, don't worry about viewing angle so much when buying an LCD. We generally only mention viewing angle in our reviews if something seems amiss.
Contrast Ratios: Contrast measurements were originally supposed to quantify the difference between the lightest light and the darkest dark on the LCD. For example, if a black portion of the screen has a brightness of 0.5 cd/m2, and a white portion has a brightness of 250 cd/m2, then the monitor would have a contrast level of 500:1. Almost immediately, this measurement has been abused; manufacturers can take these measurements on angles to assure darker darks and brighter brights. Furthermore, other manufacturers take these measurements in different light settings and with different test pattern (some take measurements with the screen completely dark, while others take measurements with the screen in a checkerboard pattern). Unfortunately, relying on manufacturer Contrast Ratios too heavily during a purchase will probably lead you astray. To correct that, we will run a standardized test in our lab that tests contrast ratios of all of our LCDs in controlled situations.
So far, we covered only the introductory basics in shopping for an LCD. Footprint, features and rotation capabilities are all important as well, but don't be awed by monitors with features that you will never use. Paying $50 extra for MagicBright or a TV tuner only makes sense if you're going to use it.
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Cat - Tuesday, November 30, 2004 - link
Kristopher, could you comment on the perceived lag that I've felt on three different 2001FPs? There's no ghosting, but the delay between moving the mouse and having an update on the screen is horrible. DVI-I and D-SUB, different video cards, systems, the works, they all have it.I don't see this on the other LCDs here at work. I know there was a Slashdot post about this a while back, and some have said it's caused by bad batches, but three of them having the same problem? I don't know if I should send my personal 2001FP back ...
InuYasha - Tuesday, November 30, 2004 - link
>Umm, yeah what up with that? Why can't someone >explain the reason to get a 19" versus a 17" if >the resolution is the same (ignoring that the >dot pitch is bigger thus easier to see).It's the same friggin reason why people buy a 50" TV instead of a small 20"
InuYasha - Tuesday, November 30, 2004 - link
>"Recall that 19" LCDs have roughly the same >viewing area as 21" CRT monitors, and that 17" >LCDs have about the same viewing ANGLE as 19" >CRTs.">angle = area in this case?
>Some stories get edited well on anandtech, and >some not so well...
a 19" LCD is measured EXACTLY 19"image display size, but a 19" CRT is usually like 18" or 17.x", the 19" is usally the glass size, not the actual image size for CRTs
sonicDivx - Tuesday, November 30, 2004 - link
Umm, yeah what up with that? Why can't someone explain the reason to get a 19" versus a 17" if the resolution is the same (ignoring that the dot pitch is bigger thus easier to see).Also why not list the settings you used for each monitor to attain the results you got (during subjective tests). This way we could set the LCD to your spec and go from there. Where is the Samsung 912N in review, its a common LCD out there?
>HelToupee
>viewing ANGLE as 19" CRTs."
>
>angle = area in this case?
HelToupee - Tuesday, November 30, 2004 - link
In the second paragraph on the first page:"Recall that 19" LCDs have roughly the same viewing area as 21" CRT monitors, and that 17" LCDs have about the same viewing ANGLE as 19" CRTs."
angle = area in this case?
Some stories get edited well on anandtech, and some not so well...
IHYLN - Tuesday, November 30, 2004 - link
I'm no english major but "more are better" "less are better" in some of the graphs made me wonder.nastyemu25 - Tuesday, November 30, 2004 - link
I agree, let's see a Sony HS-94P/B with x-black technology review!ocyl - Tuesday, November 30, 2004 - link
Should have dropped Benq's colour scores to 2 (or 1, even) for its decision to use a 6-bit panel instead of a True Colour (8-bit) one :PFilibuster - Tuesday, November 30, 2004 - link
>I think there have to be gamers here, and I do not think LCDs are there yet when it comes to refresh rates; it would have been nice to see the refresh rates on the monitors at 1024, 1280, and 1600.LCD displays don't have a refresh rate at any resolution. There is no flicker to be worried about.
Ensign - Tuesday, November 30, 2004 - link
In the Intro, it says, "A reasonably cheap, new 21" CRT runs for about $350; a reasonably cheap, new 21" LCD runs for about $330." I'm guessing that was supposed to say 17" or 19" LCD?