BenQ PE8700 service manual A2. Brightness Uniformity

A2. BRIGHTNESS UNIFORMITY

Unit: %

Brightness: Default

Contrast: Default

Uniformity =	MIN (E10, E11, E12, E13)		+ L2	+ L3 + L4 + L5 + L6 + L7	+ L8 + L9
		L1
				9

		1/20w
E10	E11	1/20h

L5

E12E13

A3. BRIGHTNESS DIFFERENCE

Unit: %

Brightness: Default

Contrast:Default

Brightness Difference=

(MAX ( E10 , E11, E12 , E13) − MIN ( E10 , E11, E12 , E13))

A4. ANSI CONTRAST

Unit: Contrast : 1

Brightness: Default

Contrast:Default

L1 + L 2 + L3 + L 4 + L5 + L6 + L7 + L8 + L9

9

Contrast Ratio shall be determined from illuminance values obtained from a black-and-white ”chessboard” pattern consisting of 16 equal rectangles. The white rectangles shall be at 100% gray and the black rectangles at 0% gray. Illuminance measurements shall be made at the center of each of the rectangles.

Contrast Ratio = Average lux value of the white rectangles/Average lux value of the black rectangles

10