BenQ PB8220 - XGA DLP Projector, Service Manual

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A9. THROW RATIO
Throw ratio = projection distance / the width of the projected image
A10. ZOOM RATIO
Zoom ratio = maximum / minimum image diagonal size at a fixed projection distance
A11. FOCUS RANGE
The minimum/maximum focus distance is the minimum/maximum projection distance (The
distance between the outermost element of projection lens and screen), expressed in meter, at
which the image is still at its acceptable focus level.(acceptable focus level is specified by
FOCUS LIMIT SAMPLE approved by customer)
A12. COLOR
Color is expressed as (x, y) in 1931CIE chromaticity values
Note: Color is measured at the center of the screen that is entirely the measured color under
default brightness and contrast settings.
A13. ANSI COLOR
ANSI Color is expressed as (u, v) in 1976 CIE chromaticity values
Note: Color is measured at the center of the screen that is entirely the measured color under
default brightness and contrast settings.
A14. COLOR UNIFORMITY
Color Uniformity is the maximum color difference (
△
x,
△
y) between any two points out of
L1~L13
A15. ANSI COLOR UNIFORMITY
ANSI Color Uniformity:
△
u’v’= [(u’1-u’0)^2+(v’1-v’0)^2]^1/2
(u’0,v’0): the average color of L1~L13
(u’1,v’1): the spot with maximum deviation from (u’0,v’0)
A16. PROJECTION OFFSET
Projection Offset= Image height above projection lens optical axis / Total image height x 100%
Note: Optical engine should be kept horizontal attitude
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