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A.20 Ghost Contrast Ratio Test Procedure
Step1. Measure the brightness from the center of pattern
Step2. Measure the max brightness from the ghost image
Contrast
_
ratio
Step3.
A.21 Center Position Shift (W-T) Test Procedure
Step1. Adjust zoom the WIDE and adjust the focus of center screen to the best and mark on the
center.
Step2. Adjust zoom the TELE and adjust the focus of center screen to the best and mark on the
center.
Step3. Measure the deviation of two center.
A.22 Full Dark Uniformity
Step1. Choose the full dark pattern and measure 13 points X,Y,Z.
Step2. Convert X,Y,Z to L,a,b
Step3.
E
(
L
1
A.23 WCE3 measurement limit condition
When input source pattern from White to Black or Black to White need wait 20 sec after to
measure WCE3 Contrast. The Diming Gain is xxx for measurement in production line.
A.24 Depth of Focus(DOF) Procedure
Procedure:
Step 1: Check specified screen sizes and zoom position (Wide)
Step 2: Get best focus image (best uniform) with Pattern1
Step 3: Use E pattern to check the depth of focus, move projector forward to close to the screen
and until E pattern became focus limit. Record the forward distance(+) for the front depth of focus.
Or move projector backward to far away the screen and until E pattern became focus limit. Record
the backward distance(-) for the rear depth of focus.
A.25 Focus Drift and Thermal Reliability Test
A.25.1 Lens Focus (Thermal) Drift Test:
1. Purpose: To Verify Projection Lens Focus Stability with Projector Burn-in Process
2. Test Procedure:
L
(
Center
_
of
_
Pattern
)
L
(
Max
_
of
_
ghost
)
2
2
L
) 2
(
a
1
a
) 2
(
2
b
1
b
) 2
166
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