PARAMETER |
TEST CONDITIONS |
MIN |
NOM |
MAX |
UNIT |
Micromirror tilt angle |
DMD landed
state(1) |
|
17 |
|
° |
Micromirror tilt angle tolerance(2)(3)(4)(5) |
|
–1.4 |
|
1.4 |
° |
Micromirror tilt direction(6)(7) |
Landed ON state |
|
180 |
|
° |
Landed OFF
state |
|
270 |
|
Micromirror crossover time(8) |
Typical
performance |
|
1 |
3 |
μs |
Micromirror switching time(9) |
Typical
performance |
10 |
|
|
Image performance(10) |
Bright
pixel(s) in active area (11) |
Gray 10
screen
(12) |
|
|
0 |
micromirrors |
Bright pixel(s) in the POM (13) |
Gray 10
screen
(12) |
|
|
1 |
Dark pixel(s) in the active area (14) |
White
screen |
|
|
4 |
Adjacent pixel(s) (15) |
Any
screen |
|
|
0 |
Unstable pixel(s) in active area (16) |
Any
screen |
|
|
0 |
(1) Measured relative to the plane
formed by the overall micromirror array.
(2) Additional variation exists
between the micromirror array and the package datums.
(3) Represents the landed tilt angle
variation relative to the nominal landed tilt angle.
(4) Represents the variation that can
occur between any two individual micromirrors, located on the same device or
located on different devices.
(5) For some applications, it is
critical to account for the micromirror tilt angle variation in the overall
system optical design. With some system optical designs, the micromirror tilt
angle variation within a device may result in perceivable non-uniformities in
the light field reflected from the micromirror array. With some system optical
designs, the micromirror tilt angle variation between devices may result in
colorimetry variations, system efficiency variations or system contrast
variations.
(6) When the micromirror array is
landed (not parked), the tilt direction of each individual micromirror is
dictated by the binary contents of the CMOS memory cell associated with each
individual micromirror. A binary value of 1 results in a micromirror landing in
the ON state direction. A binary value of 0 results in a micromirror landing in
the OFF state
direction.
See
Figure 6-17.
(7) Micromirror tilt direction is
measured as in a typical polar coordinate system: Measuring counter-clockwise
from a 0° reference which is aligned with the +X Cartesian axis.
(8) The time required for a
micromirror to nominally transition from one landed state to the opposite landed
state.
(9) The minimum time between
successive transitions of a
micromirror
(10) 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
shall be set to nominal
The diagonal size of
the projected image shall be a minimum of 20 inches
The projections screen shall be 1X gain
The projected image shall be inspected from a 38-inch minimum viewing
distance
The image shall be in focus
during all image quality tests
(11) Bright pixel definition: A single
pixel or mirror that is stuck in the ON position and is visibly brighter than
the surrounding pixels
(12) Gray 10 screen definition: All
areas of the screen are colored with the following settings:
Red = 10/255
Green = 10/255
Blue = 10/255
(13) POM definition: Rectangular
border of off-state mirrors surrounding the active area
(14) Dark pixel definition: A single
pixel or mirror that is stuck in the OFF position and is visibly darker than the
surrounding pixels
(15) Adjacent pixel definition: Two or
more stuck pixels sharing a common border or common point, also referred to as a
cluster
(16) Unstable pixel definition: A
single pixel or mirror that does not operate in sequence with parameters loaded
into memory. The unstable pixel appears to be flickering asynchronously with the
image.