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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archcommus87 - Saturday, December 4, 2004 - link
Additionally, what are your thoughts on response time? I see that many of the monitors reviewed here are 20-25 ms monitors, however so many people claim that anything over 16 is simply unacceptable for gaming. Is this true or would 25 be plenty fine?archcommus87 - Friday, December 3, 2004 - link
So SOME out there are actually 4:3 physicall. How do you know which ones? They do list l x w x h, but I'm assuming that includes base. So you must read a review or physically measure it yourself to know this?Kristopher: What is your opinion on the quality of the image when it is upscaled in such a way, say trying to run a game at 10x7 on a 19" 1280x1024 monitor.
GOSHARKS - Friday, December 3, 2004 - link
KristopherKubicki, that may be the case with some models - BUT you imply that ALL 17-19" LCDs that are 5:4 in resolution are in reality 4:3 physically, which is incorrect and confusing for people reading your review."Most 19" and 17" LCDs have an aspect ratio of 5:4 (1280x1024). This is OK, but you're looking at a 5:4 signal crammed in a 4:3 box."
KristopherKubicki - Friday, December 3, 2004 - link
archcommus87: LCDs will naturally interpolate pixels if you choose a non-native resolution. Only a few monitors will scale the image down to the correct pixel size (ie the Samsung 192T). Of course, if you do that you just turned your 19" LCD into a 17" one.Kristopher
KristopherKubicki - Friday, December 3, 2004 - link
GOSHARKS: As i stated above in the comment addressed to #14, there are LCDs that are not the correct aspect ratio. A few viewsonic models come to mind. That was the only thing I was addressing in the aspect ratio portion of the guide.Kristopher
KristopherKubicki - Friday, December 3, 2004 - link
Peter: For these LCDs you are correct, they are all the correct aspect ratio. However, we have looked at 17" and 19" pannels in the past that are 4:3 (and not surprisingly they did not get good reviews).Kristopher
archcommus87 - Friday, December 3, 2004 - link
Are the options presented thus far really the only options for running games at resolutions other than native? If so how could anyone want an LCD for gaming? Unless you're positive you'll always have a beefy enough computer to run games at 1280x1024 or higher. Or unless you don't mind playing the game with black around all sides.vailr - Friday, December 3, 2004 - link
No information as to "color accuracy". Maybe this device would be useful?****************************
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Peter - Friday, December 3, 2004 - link
Or does the Anandtech high-tech lab not feature such an old fashioned tool like a wooden stick with a scale on it?http://emoties.murphology.com/strips/displayimage....
Peter - Friday, December 3, 2004 - link
... and I had said exactly that in #14 already. No correction so far? Boo...