what this Features mean in CRT monitor ?

[Hossam]

Hello,

i wannna to know what this Features mean in CRT monitor ?

1) aperture grille & stripe pitch

2) Video Bandwidth "& how i can measure it ? "

3) RAMDAC

4) USB hub


also i want to know how this feature affect in monitor quality



thanks in advance

 

[Hossam]

????

 

[Moishe]

Aperture grille:
In Trinitron monitors, the aperture grille is a series of wires stretched vertically down the inside of the CRT (cathode ray tube) to mask the beams from the electron guns at the back of the tube. In other types of monitors, this function falls to a perforated metal plate called a shadow mask

In monitors, the shadow mask is a metal plate with holes in it that focuses the beams from the electron guns at the back of the CRT. The distance between these holes is called the dot pitch

Dot Pitch measurement is found on most monitors and defines the amount of space (in millimeters) that separates two adjacent pixels that are the same color. The smaller the Dot Pitch the sharper the image.

Stripe Pitch is a measurement used with Trinitron or Diamondtron monitors and is a measurement (in millimeters) that separates two like-colored stripes. The lower the Stripe Pitch the higher the quality of image.

When looking at monitors you should only see a Dot Pitch measurement or a Stripe Pitch measurement. You should not see both of these measurements measuring the same monitor.

Finally these two different types of measurements should not be a measurement comparison when deciding between two or more monitors, each technology is different.

video bandwidth
Video bandwidth refers to a monitor's ability to refresh the screen. High bandwidths allow more information to be painted across the display in a given amount of time, which translates into support for higher resolutions and higher refresh rates. Lower bandwidths result in flickering, ringing artifacts, and ghosting.

To calculate the bandwidth of a monitor (measured in megahertz, or MHz), multiply the horizontal resolution by the vertical resolution, and then multiply the product of the two figures by the refresh rate. For example, 800 x 600 x 75 = (36,000,000) 36 MHz.

RAMDAC
Short for Random Access Memory Digital-to-Analog Converter, a single chip on video adapter cards. The RAMDAC's role is to convert digitally encoded images into analog signals that can be displayed by a monitor. A RAMDAC actually consists of four different components - SRAM to store the color map and three digital-to-analog converters (DACs), one for each of the monitor's red, green, and blue electron guns.

USB hub
A USB hub is merely a 'splitter" for the Univeral Serial Bus (usb) so that you can plug in more usb components. USB shouldn't have an effect on your monitor performance.