6.10 Micromirror Array Optical Characteristics

PARAMETER

TEST CONDITIONS

MIN

NOM

MAX

UNIT

Micromirror tilt—half angle, variation device to device (1)

11

12

13

°

Axis of rotation with respect to system datums, variation

device to device(2)

44

45

46

°

Image performance(3)

Bright pixel(s) in active area(4)

Gray 10 screen(5)

0

micromirrors

Bright pixel(s) in the POM(6)

Gray 10 screen(5)

1

Dark pixel(s) in the active area(7)

White screen

4

Adjacent pixel(s)(8)

Any screen

0

Unstable pixel(s) in active area(9)

Any screen

0

(1)

Limits on variability of micromirror tilt half angle are critical in the design of the accompanying optical system. Variations in tilt angle

within a device may result in apparent non-uniformities, such as line pairing and image mottling, across the projected image. Variations

in the average tilt angle between devices may result in colorimetry and system contrast variations. The specified limits represent the

tolerances of the tilt angles within a device.

(2)

See Figure 6-9.

(3)

Conditions of acceptance: All DMD image quality returns are evaluated using the following projected image test conditions:

Test set degamma should be linear.

Test set brightness and contrast should be set to nominal.

The diagonal size of the projected image should be a minimum of 20 inches.

The projections screen should be 1X gain.

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

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

(4)

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

(5)

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

Red = 10/255

Green = 10/255

Blue = 10/255

(6)

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

(7)

Dark pixel definition: A single pixel or mirror that is stuck in the OFF position and is visibly darker than the surrounding pixels

(8)

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

(9)

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.

DLP2000

DLPS140B – MARCH 2019 – REVISED MAY 2022

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