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Some information about CRT, LCD and Plasma screens

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Performance parameters of a monitor are:
> Brightness, measured in candelas per square meter (cd / m²).
> Viewable image size, measured diagonally. For CRTs, the size is usually less than one inch tube.
> The screen resolution, number of pixels (dots informational white / black) that can be displayed on each dimension.
> The distance between subpixels of the same color, measured in millimeters. The distance is smaller, the sharper the picture will be.
> Refresh rate describes the number of illumination of the screen in one second. Maximum refresh rate is limited by response time.
> Response time, time required for a pixel to go from active (black), Idle (white) and the active, the new (black). Is measured in milliseconds (ms).
> Contrast ratio is the ratio of brightness of the brightest color (white) and the darkest color (black), the screen is able to produce.
> Power consumption (power), measured in watts.
> Aspect ratio, horizontal length compared to the vertical, eg Is the standard 4:3 aspect ratio, a screen 1024 pixels in length, will have height of 768 pixels. A widescreen 16:9 aspect ratio can have a screen of 1024 pixels in length, will have height of 576 pixels.
> Viewing angle, screen capacity to be seen (neperpendicular) from a different angle of 90 °, occur without excessive degradation of the image, measured in degrees, horizontally and vertically.
Comparison:

> CRT
Positive aspects:

High contrast ratio (20,000:1 or higher, much higher than most LCDs and plasma screens)
Slow response
Excellent color
It can display natively in almost any resolution and refresh rate
High angle view
Is a stable technology and tested over the years
Negative:

Size and large mass
Geometric distortion in non-flat CRTs
Higher power consumption than the same size LCD
There is a risk of moiré effect occurs at the highest resolution
Intolerant of wet environments
There is a risk (low) implosion (due to internal vacuum) if the tube is damaged
Low refresh rate causes a noticeable flicker of the image.


> LCD
Positive aspects:

Very compact and lightweight
Low power consumption
Without geometric distortion
Resistant
Present very low or no flicker depending on backlight
Negative:

Low contrast ratio
Limited viewing angle
Uneven backlight brightness can create distortions
High response time
Fixed depth of color
Has a single native resolution
More expensive than CRT
Dead pixels can occur during manufacture.

> Plasma
Positive aspects:

Very compact and lightweight
High contrast ratios (10,000:1 or higher)
Slow response
Excellent color
High angle view
Without geometric distortion
Negative:

Distance between subpixels of the same color
Noticeable flicker when viewed at close range
High operating temperature
More expensive than LCD
High power consumption
Has a single native resolution
Fixed depth of color
Dead pixels can occur during manufacture.


Resolution:

Information is displayed on an orthogonal grid system of dots (pixels) resolution forming work possible.
Common values of the resolution (width x height) are:
640x480
800x600
1024x768
1280x1024
1600x1200
1920x1080

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