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nostromo
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Montréal, Québec
Mar 2002
time: 00:20
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To sum up, here are the pros and cons of LCDs and CRTs according to Cnet
LCD (Pros):
1) Thin and stylish;
2) Crisp image (probably because the pixels are clearly defined);
3) More display area (a 15-inch LCD is equivalent to a 17-inch CRT...);
4) No refresh-rate flicker;
5) Little or no low-frequency electromagnetic emissions compared with a CRT;
6) Perfect screen geometry, which means:
quote:
A description of how accurately lines and shapes are represented on the display. LCDs almost always have perfect geometry because the display information is mapped to specific physical pixels on the display. CRTs may have problems with screen geometry; larger screens and flat-faced models have particular difficulty controlling electron beams with precision. As a result, vertical lines may be noticeably curved at the edges of the display, and circles may appear oval or egg-shaped. The best CRT monitors include controls that let you adjust the screen geometry; still, it can be difficult to adjust it perfectly in all regions of the screen.
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7) No convergence problems, which means:
quote:
Color CRTs rely on three separate electrical beams to project simultaneous red, green, and blue images; these combine to form a full-color image. If these beams are not precisely aligned, the red, green, and blue portions of the image may not overlap correctly, degrading the overall image quality. When the three beams converge correctly at all points on the display, you get a perfect image.
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LCD (Cons):
(1) Expensive;
(2) Limited viewing angle. (This can be a problem even if your sitting in front of your screen. If you sit slightly to the left, for instance, the image quality looks a bit washed out.);
(3) Color rendition may be limited or inconsistent;
(4) Moving images may smear (ghosting);
(5) Image quality is (sometimes greatly) reduced when running in nonnative resolution, because the image must be scaled to match the pattern of physical pixels;
(6) Texts are more pixelated than on CRTs. Why? Maybe its because the pixels are clearly defined. The fact that the pixels on CRTs are less clearly defined act as a form anti-aliasing.
CRT (Pros):
(1) Relatively inexpensive;
(2) Unlimited viewing angle;
(3) Generally good color rendition;
(4) Moving images do not smear;
(5) Can display different-resolution images with relatively little loss of quality;
(6) Texts are less pixelated.
CRT (Cons):
(1) Large and bulky;
(2) Pixels are not clearly defined at any resolution (that would explain why the image is not as crisp as a LCD);
(3) Less display area (a 15-inch LCD is equivalent to a 17-inch CRT);
(4) Refresh-rate flicker is below 75Hz; flicker is more severe with larger monitors;
(5) More low-frequency electromagnetic emissions than LCDs (However, I doubt this is really a problem);
(6) Nearly impossible to get perfect screen geometry, especially with flat-faced CRT designs;
(7) Almost impossible to get perfect convergence of red, green, and blue beams on all parts of the screen.
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26-10-2004 00:46
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