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4.4. Lighting System Margin Inspection
Method and Spec.
- Apply for the sample that the decision for good/fail is difficult
during visual inspection of lighting margin.
(1) Prepare CL-200 with measurement surface of width
20mm, length 5mm as in (Fig. 4-4-1)
(Fig. 4-4-1) CL-200 for lighting margin inspection (right side)
(2) Bring up Full White pattern and check whether Light Cyan
shows.
(Fig. 4-4-2) CL-200 for lighting margin inspection (right side)
(3) Measure the brightness at the boundary of the screen.
(Refer to Fig. 4-4-3)
(Fig. 4-4-3) Measure brightness of screen boundary
(4) Measure brightness at 10mm in the inner direction from
screen boundary. (Refer to Fig. 4-4-4)
(Fig. 4-4-4) Measure brightness at 10mm inside the screen
(5) Lighting Margin Spec shall be smaller than 105% of (4)
brightness/(3)brightness.
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Only for training and service purposes
4.5. Focus test method and subject
- Test pattern : White Cross-Hatch Pattern
- Tools : Focus width measurement ruler
4.5.1. Focus adjustment method
(1) Set the projection distance of Engine as 1293 mm (40 Inch
screen).
(2) Pop up the Resolution Pattern among the Test Patterns of
Set, and fix the Focus on the part where the White
Cross-Hatch Pattern is classified on each part of screen.
(3) Popup the White Cross-Hatch Pattern and measure the
width of each Point.
(4) Focus judging standard : Center 3.2 mm, 3.7 mm or less
(Measure line width excluding light Flare : Refer to Fig.
4-5-1-1)
Red Line ( light Flare), Blue Line (Thick Flare)
(Fig. 4-5-1-1) Standard for deciding line width
(Fig. 4-5-1-2) Resolution Pattern
4.5.2. Focus Stopper Location Verification
(1) Test pattern : White cross-hatch
(2) Visually verify focus after locating a white board 803 mm
from the projection lens so that screen is set to 25 inches.
(3) Inspect the location of the stopper after locating a white
board 1293 mm from the projection lens so that screen is
set to 40 inches
(4) Evaluation criteria for stopper location
Non-defective : Bushing shall be located within Guide.(Fig.
4-5-2-1)
(Fig. 4-5-2-1) Bushing verification location
- 7 -
Focus Stopper Guide Location
LGE Internal Use Only
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