6.11 Micromirror Array Optical Characteristics

PARAMETER

TEST CONDITIONS

MIN

NOM

MAX

UNIT

Micromirror tilt angle

DMD landed state(1)

17

degrees

Micromirror tilt angle tolerance(2) (4) (5) (6)

–1.4

1.4

degrees

Micromirror tilt direction(3) (8)

Landed ON state

180

degrees

Landed OFF state

270

Micromirror crossover time(9)

Typical Performance

1

3

μs

Micromirror switching time(10)

Typical Performance

10

μs

Number of out-of-specification micromirrors(7)

Adjacent micromirrors

0

micromirrors

Non-adjacent micromirrors

10

(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)

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.

(4)

Represents the landed tilt angle variation relative to the nominal landed tilt angle.

(5)

Represents the variation that can occur between any two individual micromirrors, located on the same device or located on different

devices.

(6)

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.

(7)

An out-of-specification micromirror is defined as a micromirror that is unable to transition between the two landed states within the

specified Micromirror Switching Time.

(8)

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.

(9)

The time required for a micromirror to nominally transition from one landed state to the opposite landed state.

(10) The minimum time between successive transitions of a micromirror.

(1279, 719)

(0, 0)

Off-state

light path

Bond pad 1

Incident

illumination

light path

On-state

landed edge

Tilted axis of

pixel rotation

Off-state

landed edge

Figure 6-18. Landed Pixel Orientation and Tilt

www.ti.com

DLP300S

DLPS214A – JULY 2021 – REVISED AUGUST 2021

Copyright © 2021 Texas Instruments Incorporated

Submit Document Feedback

17

Product Folder Links: DLP300S