Acer AL1913 Manuel d'entretien - 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 (5)

CR (X) is corresponding to the Contrast Ratio of the point X at Figure in Note (5).

Definition of luminance measured points and Brightness Uniformity:

Delta X=17.0mm;Delta Y=17.0mm。

Luminance of center point: L=L(1)

Brightness Uniformity Measurement points: Five specified points 1-5

Formula: Maximum [L (1), L (2), L (3), L (4), L (5), L (6), L (7), L (8), L (9), L (10),

Horizontal Line Number [pixel]

Active area

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)]

: test point

(Minolta CA-210)