Acer AL2216W AL2216W Service Guide - Page 11

(2) Definition of Contrast Ratio (CR): The contrast ratio can be calculated by the following expression and figure below. Contrast Ratio (CR) = L255 / L0 L255: Luminance of gray level 255 L 0: Luminance of gray level 0 CR = CR (1) CR (X) is corresponding to the Contrast Ratio of the point X at Figure in Note (5). Horizontal Line Number [pixel] Vertical Line Number [pixel] : test point X (Minolta CA-210) Active area The position of measuring area corner: X=10.0mm ; Y=10.0mm Luminance of center point: L=L(1) Brightness Uniformity Measurement points: Thirteen specified points 1-13 Formula: Maximum [L (1), L (2), L (3), L (4), L (5), L (6), L (7), L (8), L (9), L (10), L (11), L (12), L (13)]/Minimum [L (1), L (2), L (3), L (4), L (5), L (6), L (7), L (8), L (9), L (10), L (11), L (12), L (13)] 11