CRT
CRT or CRT monitors are the monitors everyone will have seen before. Those that seem to televisions. They range in size from 15 to about 22 inches, and weighing up to 30 pounds.
Benefits
Great value for money
mature technology
For graphic detail
able to accommodate many different resolutions
Disadvantages
Big
take a lot of space
cost more to run an LCD
LCD / TFT
LCD or liquid crystal displays have been around a few years, these are the thin screens. Some seem almost like a frame. You'll see them referred to as LCD or TFT (TFT being a kind of LCD). They start at about 14 inches, and thanks to larger LCD technological advances are produced all the time, 30 inches are already available with 40 inch on the road too. They weigh very little compared to their equivalent CRT and can be easily mounted on a wall or shelf.
Benefits
Less desk space needed
require less energy to operate, more environmentally friendly
Increase of the visible area, a "LCD 15 can give the same visible area as a 17 "CRT Monitor
Disadvantages
viewing angle can affect the image quality
a native resolution
more expensive than a CRT
General monitor Features
size
Here is one area where size matters, the larger the monitor will be easier on the eyes. You will be able to open multiple windows and the text should be easier to read. Keep in mind the viewable area, all CRTs have a smaller visible area of their size. For example, a typical 17 "CRT will have a visible area of approximately 15.8". LCD tends to have the same viewable area, so a 15 "LCD will have a 15" viewable area. monitor size (and TV) are measured in diagonal, from upper left toward the lower right corner.
Resolution
The resolution is the number of pixels displayed on the screen at once, usually in horizontal x vertical format , for example? - 800x0 or 1024x768. CRT monitors can display multiple resolutions easily, while LCDs are optimized for one native resolution (They can display other resolutions, but are optimized for 1) the higher the resolution the more you can get on the screen and the sharper the image.
CRT Specific features
Dot Pitch
Dot pitch is the distance in millimeters between two dots of the same color on the screen, usually measured diagonally and you should be looking to something around 0.26 mm
Refresh
This is the number of times the screen is redrawn per second, newer monitors must have a reasonable update frequency, 75 Hz or higher. Some CRT older had lower rates of renovation that can cause flickering of the screen and cause eye fatigue.
LCD Specific features
Brightness
The LCD monitor requires its own light again to create the color, brightness is an important factor. E 'measured in candelas per square meter or cd / m2, where a candle produces a brightness of 1 candela. The higher the number, the screen brightness.
Contrast Ratio
This is the degree of difference between the extremes of light and dark colors. The higher the contrast ratio, the more detailed the image. The blacks are blacker, whites are whiter, and in particular the text on the image will be more vivid. It 'usually be written as 500: 1 or 250: 1
Response time
refers to how quickly a pixel can change color. E 'measured in milliseconds with 20-30ms be normal at this time. The players and the people who watch a lot of movies on LCD screens would be better to opt for something with a fast response time, around 16 ms as this reduces ghosting of fast motion.
When looking to buy a new monitor all the above needs to be considered. Keep in mind you will be looking at purchasing every day for the next few years, so do not cut corners here, buy the best you can afford it, your eyes will thank you for it later.
Dead Pixel Policy
Because of the difficulties associated with the production of LCD screens very few brands guarantee a perfect pixels product (class 1),
and those that do pay premium for it.
Most of the screens that we sell currently adhere to the International Standard ISO 13406-2 and the use of Class 2 panels.
It is possible, though rare, for an LCD screen Class 2 to have a small number of defective pixels.
In these cases, this standard considers the screen as 'not bad'.
For an LCD monitor to be considered defective there must be a certain number of dead pixels:
malfunctioning pixels acceptable class and type per million pixels:
2 full constantly lit pixel (a white spot)
2 unlit pixels full (a black spot)
5 subpixels constantly on or off, or failure intermittent. May flash or show a pixel as a basic color (red, blue, green, cyan, magenta or yellow)
or any two sub pixel defects within a 5 x 5 pixel blocks
in addition, the defects are cumulative, so if you have one white spot and one black dot per million pixels so this is important.
Native Resolution Pixel Count Example
1024 x 768 786,432 2 or more defective pixels considered dead
1280 x 1024 1,310,720 3 or more dead pixels defective shall
10 x 10 1,920,000 3 or more defective pixels considered dead
So, you can have a "LCD monitor 19 with a lower native resolution where 2 would be considered defective pixels, but if he had a native resolution of 10 x 10 and then had many more pixels, so the second would not be classified as defective.
for any LCD to be classified as defective must meet the above requirements, primarily those of the specific manufacturer. it Please contact the manufacturer directly for their current dead pixel policy.
0 Komentar