LG RD-JT30 Service Manual page 87

NOTE: If linear degamma is not used then the Microsoft Paintbrush values must be adjusted to
match the degamma table being used in order to generate an equivalent blue level on the test screen
image.
2.13 Gray 30 Screen
The Gray 30 screen is used to test for the reset boundary artifact. Refer to Figure 1 for
configuration. All areas of the screen are colored a Microsoft Paintbrush gray 30 (green, red, and
blue set at 30).
NOTE: If linear degamma is not used then the Microsoft Paintbrush values must be adjusted to
match the degamma table being used in order to generate an equivalent gray level on the test screen
image.
3. ACCEPTANCE REQUIREMENTS
3.1 Conditions of Acceptance
All DMD image quality returns will be evaluated using the following projected image test
conditions:
a. Test Set degamma shall be linear.
b. Test Set brightness and contrast settings shall be set to nominal.
c. The diagonal size of the projected image shall be a minimum of 60 inches.
d. The projection screen shall be 1X gain.
e. The projected image shall be inspected from an 8 feet minimum viewing distance.
f. The image shall be in focus during all Table 1 tests.
3.2 Test Sequence
Tests shall be run in the sequence listed in Table 1.
DRAWING NO 2503651 REV A SHEET 4
TABLE 1. Image Quality Specification
SEQ # TEST
1 Major Dark
Blemish
2 Major Light
Blemish
SCREEN ACCEPTANCE CRITERIA
Two Zone Blue 60 1. No blemish will be darker than Microsoft Blue 60 in the
Critical Zone
2. __ 2 blemishes in the Non-Critical Zone
3. No blemish will be > ½" long/diameter in the
Non-Critical Zone
Two Zone Gray 10 1. No blemish will be lighter than Microsoft Gray 10 in the
Critical Zone
2. __ 2 blemishes in the Non-Critical Zone
3. No blemish will be > ½" long/diameter in the
Non-Critical Zone
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