CRT and LCD
CRTs
The primary advantage that CRT monitors held over LCDs was their color rendering. The contrast
ratios and depths of colors displayed were much greater with CRT monitors than LCDs. While this still
holds true in most cases, many strides have been made in LCDs such that this difference is not as great as it
once was. Many graphic designers still use the very expensive large CRT monitors in their work because of
the color advantages. Of course, this color ability does degrade over time as the phosphors in the tube break
down.
The other advantage that CRT monitors held over LCD screens is the ability to easily scale to various
resolutions. This is referred to as multisync by the industry. By adjusting the electron beam in the tube, the
screen can easily be adjusted downward to lower resolutions while keeping the picture clarity intact.
While these two items may play an important role for CRT monitors, there are disadvantages as well.
The biggest of these are the size and weight of the tubes. An equivalent sized LCD monitor is upwards of
80% smaller in size and weight compared to a CRT tube. The larger the screen, the bigger the size
difference. The other major drawback deals with the power consumption. The energy needed for the
electron beam means that the monitors consumer and generate a lot more heat than the LCD monitors.
Pros: Cons:
• Multisync Capable • Very Heavy and Large
• High Refresh Rates • Use Large Amounts of Energy
• Color Clarity and Depth • Generate Excess Heat
LCDs
The biggest advantage to LCD monitors is their size and weight. As was mentioned earlier, the size
and weight of an LCD monitor can be upwards of 80% lighter than an equivalent dimension CRT screen.
This makes it possible to users to have larger screens for their computers than was possible before.
LCD screens also tend to produce less eye fatigue to the user. The constant light barrage and scan lines
of a CRT tube tend to cause strain on heavy computer users. The lower intensity of the LCD monitors
coupled with their constant screen display of pixels being on or off produces less fatigue for the user.
The most notable disadvantage to LCD screens is their fixed or native resolution. An LCD screen can
only display the number of pixels in its matrix and no more or less. It can display a lower resolution in one
of two ways. Using only a fraction of the total pixels on the display or through extrapolation. Extrapolation
is a method whereby the monitor blends multiple pixels together to simulate a single smaller pixel. This can
often lead to a blurry or fuzzy image particularly with text when running the screen below is native
resolution.
Video was problematic with early LCD monitors because of lower response times. This has been
overcome by many improvements, but there are some that still have low response times. Purchasers should
be aware of this when purchasing a monitor. However, the improvements are often work arounds that can
actually lead to another problem of reduced color clarity. Unfortunately, the industry is very poor about
properly listing the specifications for monitors to help buyers understand and compare monitors.
Pros: Cons:
• Smaller and Lighter • Blurry Images Outside Native Resolution
• Energy Efficient • Motion Blur on Fast Moving Images
• Causes Less Eye Fatigue •Come Models Have Reduced Color Clarity
Conclusions
At this point and time, most consumers will likely be purchasing LCD monitors over CRTs. There is
almost no difference in the cost to consumers thanks to production improvements in LCDs and the reduction
in the production of CRTs. Typically CRTs will only be seen sold with the least expensive of desktop
computer systems or by those with special imaging needs such as graphics and medical professionals.
Предмет: | Компютърни системи и технологии, Информатика, ИТ |
Тип: | Теми |
Брой страници: | 1 |
Брой думи: | 410 |
Брой символи: | 3076 |