BenQ SX930, Service Manual

Page: 174 / 175

174
in order to generate an equivalent blue level on the test screen image.
Gray 10 Screen
The Gray 10 screen is used to test for major light blemishes. All areas of the screen are colored a
Microsoft Paintbrush gray 10 (green, red, and blue set at 10).
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.
Gray 30 Screen
The Gray 30 screen is used to test for the reset boundary artifact. 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:
Test Set degamma shall be linear.
Test Set brightness and contrast settings shall be set to nominal.
The diagonal size of the projected image shall be a minimum of 60 inches.
The projection screen shall be 1X gain.
The projected image shall be inspected from an 8 feet minimum viewing distance.
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.
Table 1. Image Quality Specification
SEQ# Test SCREEN ACCEPTANCE CRITERIA
1
Major Dark
Blemish
Blue 60
1.
≦
4 visible dark blemishes are allowed in the active
area
2. No blemish will be
＞
1.5” long/diameter
2
Major Light
Blemish
Gray 10
1.
≦
4 visible dark blemishes are allowed in the active
area
2. No blemish will be
＞
1.5” long/diameter
3
Reset Boundary
Artifact
Gray 30 No reset boundary artifacts allowed
4
Eyecatchers /
Border Artifacts
Any screen Eyecatcher and border artifacts are allowed
5 Projected Images
1. Any screen
2. Gray 10
3. Any screen
4. Gray 10
5. Whit
6. Any screen
7. Any screen
1. No adjacent pixels
2. No bright pixels in Active Area
3. No unstable Pixels in Active Area
4.
≦
1 right pixel in the POM
5.
≦
4 dark pixels in the Active Area
6. No DMD window aperture shadowing on the
Active Area
7. Minor blemishes are allowed
Notes:
6. Projected blemish numbers include the count for the shadow of the window artifact in addition
to the artifact itself.
7. During all Table 1 tests, projected images shall be inspected in accordance with the conditions
of inspection specified in Section 3.
8. The rejection basis for all cosmetic DMD defects (scratches, nicks, particles) will be the