5.11 Micromirror Array Optical Characteristics

PARAMETER

TEST CONDITIONS

MIN

NOM

MAX

UNIT

Micromirror tilt angle

DMD landed state (1) (2) (3) (4)

13.5

14.5

15.5

degrees

Micromirror crossover time(5)

1

3

µs

Micromirror switching time(6)

6

µs

Image

Performance(7)

Bright pixel(s) in active area(8)

Gray 10 Screen(9)

0

Micromirrors

Bright pixel(s) in the POM(10)

Gray 10 Screen(9)

1

Dark pixel(s) in the active area(11)

White Screen

4

Adjacent pixel(s)(12)

Any Screen

0

Unstable pixel(s) in active area(13)

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 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.

(5)

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

(6)

The minimum time between successive transitions of a micromirror

(7)

Conditions of Acceptance: All DMD image quality returns will be 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 20 inches

The projection screen shall be unity gain

The projected image shall be inspected from a 38-inch minimum viewing distance

The image must be in focus during all image quality tests.

(8)

Bright pixel definition: A single pixel or mirror that is stuck in the ON position and is visibly brighter than the surrounding pixels.

(9)

Gray 10 screen definition: All areas of the screen are colored with the following settings:

Red = 10/255

Green = 10/255

Blue = 10/255

(10) POM definition: Rectangular border of off-state mirrors surrounding the active area

(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) Adjacent pixel definition: Two or more stuck pixels sharing a common border or common point, also referred to as a cluster.

(13) 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.

5.12 Window Characteristics

PARAMETER

MIN

NOM

MAX

Window material

Corning Eagle XG

Window refractive index

at wavelength 546.1nm

1.5119

Window aperture (1)

Illumination overfill

See Section 6.5

(1)

See the mechanical package ICD for details regarding the size and location of the window aperture.

5.13 Chipset Component Usage Specification

Reliable function and operation of the DLP391TP DMD requires that it be used in conjunction with the other

components of the applicable DLP chipset, including those components that contain or implement TI DMD

control technology. TI DMD control technology consists of the TI technology and devices used for operating or

controlling a DLP DMD.

DLP391TP

DLPS289A – JUNE 2025 – REVISED SEPTEMBER 2025

www.ti.com

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