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2.12 Red Ramp test screen
This screen is used to test light border blemishes and bright pixels. All areas of the active
area are colored at a specific gray level, based on MS Paint 0-255 RGB scale:
Major Dark Blemish
Blue Value 0
Red Value Start 0,end 255
Green Value 0
3. ACCEPTANCE REQUIREMENTS
3.1 Test Conditions (as tested in OEM projector)
· Projector degamma correction shall be linear. Using HD Control “Curtain” Mode is
equivalent.
· Image noise reduction algorithms “Blue Noise STM” and “Boundary Dispersion” shall be
set to “off”.
· Projector shall be used in front projection mode using a customer-specified screen, and
OEM optical system.
· The diagonal size of the projected image shall be 52 inches (132cm).
· The projected image shall be inspected from a 60 inches (1.52 meter) minimum viewing
distance.
· Projector will be properly focused on the DMD array as shown on the screen.
· Testing time is limited to 20seconds per screen.
· Refer to Table 1 for acceptance criteria, in specified order:
TEST
ORDER
TEST SCREEN ACCEPTANCE CRITERIA
1 Major Dark Blemish Blue 90 No dark blemishes visible on Blue 90
2 Dark Pixel Blue 90
Zoned Screen (see
below figure 1)
0 dark pixels allowed in Zone A
<=2 dark pixels allowed in Zone B
No adjacent dark pixels
3 Border Defects Gray 10 No border defects visible
4 Major Light Blemish Gray 6 No light blemishes visible on Gray 6