0.60

7.06

TP1 (ceramic)

Window Edge

(4 surfaces)

19

DLP2000

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Window Characteristics and Optics (continued)

7.5.1.2 Pupil Match

TI’s optical and image quality specifications assume that the exit pupil of the illumination optics is nominally

centered within two degrees of the entrance pupil of the projection optics. Misalignment of pupils can create

objectionable artifacts in the display’s border as well as the active area, which may require additional system

apertures to control, especially if the numerical aperture of the system exceeds the pixel tilt angle.

7.5.1.3 Illumination Overfill

The active area of the device is surrounded by an aperture on the inside DMD window surface that masks

structures of the DMD chip assembly from normal view, and is sized to anticipate several optical operating

conditions. Overfill light illuminating the area outside the active array can create artifacts from the mechanical

features surrounding the active array and other surface anomalies that may be visible on the screen. The

illumination optical system should be designed to limit light flux incident anywhere outside more than 20 pixels

from the edge of the active array on all sides. Depending on the particular system’s optical architecture and

assembly tolerances, this amount of overfill light on the outside of the active array may still cause artifacts to still

be visible.

7.6 Micromirror Array Temperature Calculation

Figure 10. DMD Thermal Test Point

The micromirror array temperature can be computed analytically from measurement points on the outside of the

package, the package thermal resistance, the electrical power dissipation, and the illumination heat load. The

relationship between array temperature and the reference ceramic temperature is provided by the following

equations:

(1)

(2)

•

•

•

Thermal Information

•

•

•

•

SL = Measured ANSI screen lumens (lm)

(3)