Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1996-10-21
1998-06-23
Epps, Georgia Y.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359212, 359291, G02B 2600
Patent
active
057711160
ABSTRACT:
A DMD spatial light modulator (20) having an improved reset waveform (80) that improves the electrostatic control over the DMD mirrors (30) during switching states (T3). An intermediate bias level is provided to the yoke (32) and mirror (30) during the mirror reset cycle (T3) which is sufficient to maintain a voltage differential between the mirror/yoke and the address electrodes (26,28,50,52) to dynamically park the mirror during a same-state transition, but which voltage differential is insufficient to overcome the hinge restoration forces during an opposite-state transition such that the mirror releases toward the neutral position and can be captured in the other state upon reapplication of the bias voltage. The transition bias level is maintained for a sufficient time period (T3) to allow the mirror/yoke to release from the landing pads (82) a sufficient distance toward the neutral position. The operating reliability of the device is improved by preventing incident light during same-state mirror transitions from escaping into the display aperture, without impeding the crossover of the mirror during opposite-state mirror transitions. Greater mirror-to-mirror variations can be tolerated without falling outside the mirror arrays acceptable timing operating parameters.
REFERENCES:
patent: 5061049 (1991-10-01), Hornbeck
patent: 5079544 (1992-01-01), DeMond et al.
patent: 5105369 (1992-04-01), Nelson
patent: 5278652 (1994-01-01), Urbanus et al.
patent: 5444566 (1995-08-01), Gale et al.
patent: 5535047 (1996-07-01), Hornbeck
Burton Mark L.
Cleveland Harian Paul
Gale Richard
Miller Rodney
Bey Dawn-Marie
Brill Charles A.
Donaldson Richard L.
Epps Georgia Y.
Kesterson James C.
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