Aperture Grille and Shadow Mask
An aperture grille is a set of vertical wires stressed vertically down inside of the CRT used to mask beams from the electron guns at the back of the true .
Shadow Mask is fine metal sheet that is used to ensure that the electron beam emitted from individual electron guns strike only the correct phosphor dots. A shadow mask is just used before the phosphor dots. The mask is a fine metal sheet with a regular array of holes punched in it.
Aperture grille is better than Shadow Mask because of –
- less power
- are brighter
- have better colors and brightness.