奇
菱
光電股份有限公司
Chi Lin Optronics Corp.
Doc. No
CS-72601
Version A3
Title
CHT-726 Level 1 Service Manual
Page
19 / 75
Blue gray scale test screen
Blue Value
Start R0-G0-B0,
End R0-G0-B255
Red Value
0
Green Value
0
ACCEPTANCE REQUIREMENTS
1. Conditions of Acceptance All DMD image quality returns will be evaluated using the following
projected image test conditions:
a. Texas Instruments performs image quality acceptance testing on specifically designed
HD2 DMD test equipment. If the DMD is judged to complete this test successfully, it is
acceptable.
b. Texas Instruments understands the customer will perform image quality testing in their
own PTV application. Incoming test conditions must be mutually agreed to between
customer and Texas Instruments before initial DMD acceptance testing begins.
c. Texas Instruments recommends cleaning the DMD before installation to the projector,
according to the instructions in the DMD Cleaning Document (TI drawing #2504640).
d. Texas Instruments recommends handling the DMD according to the instructions in the
DMD Handling Document (TI drawing #2504641)
e. Projector de-gamma correction Curve shall be in accordance with Test Screen definitions
on sheets 3 & 4 of this document. The correct RGB value must align with the
appropriate De-Gamma Curve.
Reference Note # 1:
If the De-Gamma curve is not known then the Linear Lux values for a given test screen
can be calculated by the following equations The following are center point Lux
measurements for a gray screen calculation. SLR (Spoke Light Recapture) is a
contributor to the white Lux value. For absolute accuracy it must be turned off when
making the White Lux measurement.
( White Lux value – Black Lux value)
--------------------------------------------------- = Lux per Step
255
Therefore, the Lux Value of a Gray 10 = 10 x Calculated Lux per Step
Reference Note # 2:
Peak Lux Percent is calculed by determining what precent of 255 is a test screen.
Example: Gray 10 is 10 / 255 or 3.9% of the white test screen’s Lux value.
f. The diagonal size of the projected image shall be at minimum 52inches (132cm).
g. The projected image shall be inspected from a 60 inch (152cm) minimum viewing
distance.
h. Projector must be properly focused on the DMD array as shown on the screen.
i. Testing time is limited to 20 seconds per screen.
