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Resolution

Posted on 1998-06-09
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Hi
If a monitor has a better resolution, it means it has more dots on the same screen surface.

What happens. Is the distance between the dots getting smaller. Are the dotts getting smaller. Or both.
Are those dots the same for every monitor ?
What I am specially interested in is if there are different sized dots and if a monitor is considered to be a better one  if it has a smaller dot.

Thanks
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Question by:simi
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shalbe earned 80 total points
ID: 1019158
Hi simi,

A smaller dot pitch  (smaller dot size / more per inch) will provide better resolution and all other things being equal, will be a better picture.

There are other considerations regarding monitor quality. Refresh rate (the number of times it redisplays per second) is also important. Some monitors have a small dot pitch but have low refresh rates at high resolution causing screen flicker.

This site has an excellent discussion on monitors. All the answers you could want are there.

     http://www.pcguide.com/ref/crt/index.htm

Here is a page with definitions of common video technology terms.

     http://www.karmaint.com/vga2_glos.html

Hope this helps.

Steve
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by:shalbe
ID: 1019159
Forgot to mention that I have heaRD THAT there are different ways of measuring dot pitch not all giving the same result so if dot pitch values are very close, there may not be a difference.
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by:simi
ID: 1019160
Yes but preciselly. Dot pitch means the distance between pixels. Or it refers to the size of the pixel too ?
What you really measure when you get the dot pitch, the distance between the centers of the dots ? Then what is telling you about the size of the pixel ?
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by:shalbe
ID: 1019161
simi,

I found these references to dot pitch. It appears it is measured center to center but the geometry of the display technology influences the measurement.

Dot Pitch

Most monitors are advertised with a dot pitch specification, usually from 0.25 to 0.40.
Oddly enough, they often don't indicate what the unit is for this measurement; it's mm
(millimeters). The CRT's screen is made up of small elements of red, green and blue
phosphorous material, called dots. The dot pitch is the distance between adjacent sets of
red, green and blue dots.

dot pitch

        <hardware> The distance between a dot and the closest dot of
        the same colour (red, green or blue) on a color {CRT}.  Dot
        pitch is typically from 0.28 to 0.51 mm but large presentation
        monitors may go up to 1.0 mm.  The smaller the dot pitch, the
        crisper the image, 0.31 or less provides a sharp image,
        especially when displaying text.

        Dot pitch measurements between conventional tubes and {Sony}'s
        {Trinitron} tubes are roughly, but not exactly comparable.
        Sony's {CRT}s use vertical stripes, not dots, and its
        measurement is the distance between stripes, not the diagonal
        distance between dots.

Sharpness

Clearly the most important attribute of any monitor is sharpness. Factors such as dot pitch, band width, and internal
electronics contribute to a monitors sharpness. Bandwidth is the frequency with which the image is drawn on screen. Dot
pitch is the distance between the centers of adjacent same-color dots. In general low dot pitch and high bandwidth will
create a sharper images.

One difficulty however, if you try to compare specifications. It is difficult because different manufacturers use different
specifications. For example, some measure dot pitch. However other manufacturers use different technologies to sharpen
images. Sony Trinitron monitors arrange phosphors in rows of verical lines, whereas conventional displays arrange
phosphors in red, green, blue triads to form dots.

        ["The Computer Glossary", Alan Freedman].

        (14 Dec 1995)




Steve
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