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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.

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

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.

Positive aspects:

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

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

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.


Information is displayed on an orthogonal grid system of dots (pixels) resolution forming work possible.
Common values of the resolution (width x height) are:

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