PARAMETER | TEST CONDITIONS | MIN | NOM | MAX | UNIT |
---|
Micromirror tilt angle | DMD landed state(1) | | 12 | | degree |
Micromirror tilt angle tolerance(2) | | –1 | | 1 | degree |
DMD efficiency(3) | 420nm
–
700nm | | 66% | | |
(1) Measured relative to the plane formed by the overall micromirror array at 25°C.
(2) For some applications, it is critical to account for the micromirror tilt angle variation in the overall optical system design. With some optical system 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 optical system designs, the micromirror tilt angle variation between devices may result in colorimetry variations, system efficiency variations, or system contrast variations.
(3) DMD efficiency is measured photopically under the following conditions:
24° illumination angle, F/2.4 illumination and collection apertures,
uniform source spectrum (halogen), uniform pupil illumination, the
optical system is telecentric at the DMD, and the efficiency numbers
are measured with 100% electronic micromirror landed duty-cycle and
do not include system optical efficiency or overfill loss. This
number is measured under conditions described above and deviations
from these specified conditions
can
result in a different efficiency value in a different optical
system. The factors that can influence the DMD efficiency related to
system application include: light source spectral distribution and
diffraction efficiency at those wavelengths (especially with
discrete light sources such as LEDs or lasers), and illumination and
collection apertures (F/#) and diffraction efficiency. The
interaction of these system factors as well as the DMD efficiency
factors that are not system dependent are described in detail in
DMD Optical Efficiency for Visible
Wavelengths Application Note.