Datasheet

DLP4500
DLPS028A –APRIL 2013–REVISED MAY 2013 www.ti.com
Micromirror Array Optical Characteristics
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 Documents) for guidelines.
Table 6. Optical Parameters
PARAMETER CONDITIONS MIN NOM MAX UNIT
DMD parked state
(1)(3)(4)
,
0
see
(10)
α Micromirror tilt angle degrees
DMD “landed” state
(1)(5)(6)
,
11 12 13
see
(10)
β Micromirror tilt angle variation
(1)(5)(7)(8)(9)
See
(10)
–1 1 degrees
Micromirror crossover time
(2)(12)
5 μs
Micromirror switching time
(12)
16 μs
Non-adjacent micromirrors 10
Non-operating micromirrors
(11)
micromirrors
Adjacent micromirrors 0
Orientation of the micromirror axis-of-rotation
(13)
89 90 91 degrees
420 nm to 700 nm, with all
Micromirror array optical efficiency
(14)(15)
66%
micromirrors in the ON state
Mirror metal specular reflectivity (420 nm – 700 nm) 89.4%
Window material Corning Eagle XG
Window refractive index At 546.1 nm 1.5119
Window aperture See
(16)
Illumination Overfill
(17)
(1) Measured relative to the plane formed by the overall micromirror array
(2) Micromirror crossover time is primarily a function of the natural response time of the micromirrors.
(3) Parking the micromirror array returns all of the micromirrors to a relatively flat (0˚) state (as measured relative to the plane formed by the
overall micromirror array).
(4) When the micromirror array is parked, the tilt angle of each individual micromirror is uncontrolled.
(5) Additional variation exists between the micromirror array and the package datums.
(6) 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 an nominal angular
position of +12 degrees. A binary value of 0 results in a micromirror landing in an nominal angular position of –12 degrees.
(7) Represents the landed tilt angle variation relative to the nominal landed tilt angle
(8) Represents the variation that can occur between any two individual micromirrors, located on the same device or located on different
devices.
(9) 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.
(10) See Figure 4.
(11) Non-operating micromirror is defined as a micromirror that is unable to transition nominally from the –12 degree position to +12 degrees
or vice versa.
(12) Performance as measured at the start of life.
(13) Measured relative to the package datums B and C, shown in the Package Mechanical Data section at the end of this document.
(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
– IIllumination overfill of the DMD micromirror array
– Aberrations present in the illumination source and/or path
– Aberrations present in the projection path
– etc.
The specified nominal DMD optical efficiency is based on the following use conditions:
– Visible illumination (420 nm–700 nm)
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