Table 5-3 Micromirror Array Optical
Characteristics
|
PARAMETER |
TEST CONDITIONS |
MIN |
TYP |
MAX |
UNIT |
Micromirror tilt angle (2)
(3)
(4)
(5) |
Landed state (1) |
15.6 |
17.0 |
18.4 |
degrees |
Micromirror crossover time (6) |
typical performance |
|
1 |
|
µs |
Micromirror switching time (7) |
typical performance |
6 |
|
|
µs |
DMD Efficiency (420 nm -– 680 nm)(8) |
|
68 |
|
%
|
Image performance(9) |
Bright pixel(s) in active area(10) |
Gray 10 screen(13) |
|
|
0 |
micromirrors |
Bright pixel(s) in the POM(10)
(12) |
Gray 10 screen(13) |
|
|
2 |
Dark pixel(s) in the active area(11) |
White screen(14) |
|
|
8 |
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 variation that can
occur between any two individual micromirrors, located on the same device or
located on different devices.
(4) 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) The time required for a
micromirror to nominally transition from one landed state to the opposite landed
state.
(7) The minimum time between
successive transitions of a micromirror.
(8) Efficiency numbers assume
34-degree illumination angle, F/1.7 illumination and collection cones, uniform
source spectrum, and uniform pupil illumination. Efficiency numbers assume 100%
electronic micromirror duty cycle and do not include optical overfill loss. The
efficiency is a
photopically-weighted
number corresponding to 17.5-degree tilt angle. Note that this number is
specified under conditions described above and deviations from the specified
conditions could result in decreased efficiency.
(9) Conditions of Acceptance: all DMD
image performance returns are 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 60 inches.
The projections screen shall be 1× gain.
The
projected image shall be inspected from an 8-foot minimum viewing distance.
The image shall be in focus during all image
performance tests.
(10) Bright pixel definition: a single
pixel or mirror that is stuck in the ON position and is visibly brighter than
the surrounding pixels.
(11) Dark pixel definition: a single
pixel or mirror that is stuck in the OFF position and is visibly darker than the
surrounding pixels.
(12) POM definition: rectangular
border of off-state mirrors surrounding the active area.
(13) Gray 10 screen definition: a full
screen with RGB values set to R = 10/255, G = 10/255, B = 10/255
(14) White screen definition: a full
screen with RGB values set to R=255/255, G = 255/255, B = 255/255
(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.
Refer to
Section 5.10
for
M, N, and P specifications.