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2510332 - February 2009

Integrator Rod

Fold Mirror

Relay Optics

Lamp

Color Wheel

DMD

Projection Lens

TIR Prism

Figure 2. Generic Telecentric Optical System Components Using a TIR Prism

      • 2.1.1

        Advantages of Telecentric Architecture Some inherent advantages/features of telecentric architecture are:

        • Uniform black level due to uniform illumination angles. However, absolute black level is

typically higher (worse) than nontelecentric architectures. This is due to the proximity of flat optical surfaces near the mirror device and the lower overall illumination angles.

  • Separation of illumination and projection in glass rather than air space for shorter overall

path length.

  • Shorter back working distance for projection lens due to path in glass rather than air.

  • Projection offset for keystone correction can be optimized for application to minimize field of

projection lens, if the application allows.

  • Variable projection offset for stacking applications, fixed-install flexibility, etc. can be achieved with prism design.

  • Zero offset and minimal lens size can be achieved for rear-screen applications with prism design. Rear screens cannot accept high angles of incidence caused by offset due to Fresnel-lens screen limitations.

  • Pupil location at/near infinity means no magnification changes with focus.

6

May not be reproduced without permission from Texas Instruments

Copyright 2009 Texas Instruments Incorporated

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