TI assumes no responsibility for end-equipment
optical performance. Achieving the desired end-equipment optical
performance involves making trade-offs between numerous component
and system design parameters. See the related application reports
(listed in Related Links) for guidelines.
| PARAMETER | TEST CONDITIONS | MIN | NOM | MAX | UNIT |
|---|
| a | Micromirror tilt angle | DMD parked state (1) (2) (3), See Figure 7-6 | | | 0 | degrees |
DMD landed state (1) (4) (5)
See Figure 7-6 | | | 12 |
| β | Micromirror tilt angle variation (1) (4) (6) (7) (8) | See Figure 7-6 | -1 | | 1 | degrees |
| | Micromirror crossover time (9) | | 3 | | µs |
| | Micromirror switching time (10) | | 12.5 | | µs |
| | Array switching time at 400MHz with global reset (11) | | 56 | | µs |
| Non-operating micromirrors (12) | Non-adjacent micromirrors | | | 10 | micromirrors |
| Adjacent micromirrors | | | 0 |
| Orientation of the micromirror axis-of-rotation (13) | See Figure 7-6 | 44 | 45 | 46 | degrees |
| Micromirror array optical efficiency (14) (15) |
363nm to 420nm, with all
micromirrors in the ON state | | 68% | | |
| Window material | | | Corning 7056 | | |
| Window artifact size | Within the window aperture(16) | | | 400 | μm |
| Window aperture | | | See (17) | | |
(1) Measured relative to the plane formed by the overall micromirror array.
(2) Parking the micromirror array returns all of the micromirrors to an essentially flat (0°) state (as measured relative to the plane formed by the overall micromirror array).
(3) When the micromirror array is parked, the tilt angle of each individual micromirror is uncontrolled.
(4) Additional variation exists between the micromirror array and the package datums, as shown in Mechanical, Packaging, and Orderable Information.
(5) When the micromirror array is landed, the tilt angle 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 a nominal angular position of +12°. A binary value of 0 results in a micromirror landing in a nominal angular position of –12°.
(6) Represents the landed tilt angle variation relative to the nominal landed tilt angle.
(7) Represents the variation that can occur between any two individual micromirrors, located on the same device or located on different devices.
(8) 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 and/or system contrast variations.
(9) Micromirror crossover time is the transition time from landed to landed during a crossover transition and is primarily a function of the natural response time of the micromirrors.
(10) Micromirror switching time is the time after a micromirror clocking pulse until the micromirrors can be addressed again. It included the micromirror settling time.
(11) Array switching is controlled and coordinated by the
DLPC410 and
DLPA200. Nominal switching time depends on the system implementation
and represents the time for the entire micromirror array to be refreshed (array
loaded plus reset and mirror settling time).
(12) Non-operating micromirror is defined as a micromirror that is unable to transition nominally from the –12° position to +12° or vice versa.
(13) Measured relative to the package datums 'B' and 'C', shown in the Mechanical, Packaging, and Orderable Information.
(14) The minimum or maximum DMD optical efficiency observed in a specific application depends on numerous application-specific design variables, such as:
- Illumination wavelength, bandwidth/line width, degree of coherence
- Illumination angle, plus angle tolerance
- Illumination and projection aperture size, and location in the system optical path
- Illumination overfill of the DMD micromirror array
- Aberrations present in the illumination source and/or path
- Aberrations present in the projection path
The specified nominal DMD optical efficiency is based on the following use conditions:
-
UV illumination (363nm to 420nm)
- Input illumination optical axis oriented at 24° relative to the window normal
- Projection optical axis oriented at 0° relative to the window normal
- ƒ / 3.0 illumination aperture
- ƒ / 2.4 projection aperture
Based on these use conditions, the nominal DMD optical efficiency results from the following four components:
- Micromirror array fill factor: nominally 94%
- Micromirror array diffraction efficiency: nominally 85%
- Micromirror surface reflectivity: nominally 89%
- Window transmission: nominally 98% (single pass, through two surface transitions)
(15) Does not account for the effect of micromirror switching duty cycle, which is application-dependent. The micromirror switching duty cycle represents the percentage of time that the micromirror is actually reflecting light from the optical illumination path to the optical projection path. This duty cycle depends on the illumination aperture size, the projection aperture size, and the micromirror array update rate.
(16) See Mechanical, Packaging, and Orderable Information for details regarding the size and location of the window aperture.