Acer AL2216W Service Manual - Page 11

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(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).

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)]

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Horizontal Line Number [pixel]

Active area

: test point

(Minolta CA-210)