วันอาทิตย์ที่ 1 มีนาคม พ.ศ. 2552

CRT & LCD


CRT and LCD are visual display units, they are also called monitors or displays. They display images generated from the video output of computer. CRT stands for Cathode Ray Tube and LCD stands for Liquid Crystal Display. The CRT is a vacuum tube containing an electron gun and a fluorescent screen, they are used to create images in the form of light emitted from the fluorescent screen but the LCD is shaped into a thin panel filled with liquid crystals and arrayed in front of a light source (backlight) or reflector. CRT and LCD are different in terms of size, performance and price. I will compare them point by point.

The most notable difference is size. CRT and LCD are very different in size. This is one of the major concerns for people who want to buy a monitor. From above, the CRT contains a vacuum tube and an electron gun so it has a big size, and uses more space. However, based on its size, it is heavy. The CRT is hard to move. On the other hand, the LCD is smaller than CRT because it is replaced with liquid crystals. This makes it possible for users to have larger screens for their computers and makes it more convenient to move than a CRT. Furthermore, the LCD is light and portable.

Performance is another difference to be considered. The primary advantage that CRT holds over LCD is its color rendering. The contrast ratios and depths of colors display of CRT are much greater than LCD. Many graphic designers still use the very expensive large CRT monitors in their work because of the color advantage. The disadvantage of CRT is that it generates excess heat. On the other hand, the biggest advantage of LCD is less eye fatigue. The LCD tends to produce less eye fatigue to the user because the LCD has lower refresh rate than a CRT. The disadvantage of LCD is their fixed or native resolution. An LCD screen can only display the number of pixels in its matrix and no more or less.

Moreover, price also marks a big difference. In 1972, The LCD can cost over twice as much as a CRT. Later, the price of LCD is decreased so much and it is still more expensive than a CRT. However, it is not too hard to buy it. It is up to your requirement. For example, if you want a fresh display, you should buy the CRT because it has higher refresh rate than an LCD or if you want small and light monitor, you should buy an LCD.

In conclusion, I always spend almost all the time staying in front of the monitor so I think the LCD is better than a CRT because it looks beautiful, easy to relocate and causes less eye fatigue. I do not care too much about native resolution of LCD and there is not too much difference in price, thanks to production improvements in LCD and the reduction in the production of CRT. In my opinion, the best choice is an LCD.

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