The degauss button fixes this. Spacing between groups of red, green, and blue phosphor dots on the screen. Some manufacturers specify aperture-grille spacing instead of dot pitch. Resolution Screen resolution is measured in pixels, or picture elements. One pixel is the smallest area that the computer can manipulate.
Resolution is stated as the horizontal number of pixels by the vertical number of pixels.
A screen displaying 1600X1200 pixels has 1200 rows, each 1600 pixels wide. Vertical scan rate or refresh rate Number of times the screen is redrawn per second. Minimum acceptable refresh rate is 70Hz. The higher the refresh, the better the image. An aperture grille uses vertical wires to direct electron beams to phosphors of a certain color.