US Patent No: 6,466,358

Number of patents in Portfolio can not be more than 2000

Analog pulse width modulation cell for digital micromechanical device

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ALSO PUBLISHED AS: 20020012159
ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

A frame-addressed bistable micromirror array and method of operation. An analog input signal representing the desired intensity of an image pixel is applied to input 302. An address signal synchronized to the analog input signal is applied to input 304 of a given micromirror cell to store the pixel intensity information on input capacitor 306. After intensity information for each pixel in the video frame or field, or a portion of the frame of field, is stored on the input capacitor 306 of the appropriate micromirror cell, a frame signal is applied to input 308 to enable the transfer of charge between capacitors 306 and 310 and to turn on transistor 314 allowing a voltage applied to input 316 to charge capacitor 318. The pre-charge voltage is chosen to ensure the biased micromirrors are fully deflected to a first state. A ramp voltage is applied to input 322. A ramp voltage is applied to input 322. When the difference between the voltage across capacitor 310, which is applied to the gate of transistor 324, and the ramp voltage, which is applied to the drain of transistor 324, exceeds the threshold voltage required to turn on transistor 324, transistor 324 is turned on, and the voltage across capacitor 318 follows the ramp voltage applied to 322. The range of the ramp voltage is chosen so that, when any ramp voltage in the range is applied to the deflectable element of the micromirror, the deflectable element will assume the second state.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TEXAS INSTRUMENTS INCORPORATEDDALLAS, TX17098

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Tew, Claude E Dallas, TX 24 975

Cited Art

Patent Info (Count) # Cites Year
 
TEXAS INSTRUMENTS INCORPORATED (6)
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5,670,976 Spatial light modulator having redundant memory cells 8 1995
5,535,047 Active yoke hidden hinge digital micromirror device 438 1995
6,147,790 Spring-ring micromechanical device 230 1999

Patent Citation Ranking

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7,164,520 Packaging for an interferometric modulator 30 2004
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7,343,080 System and method of testing humidity in a sealed MEMS device 8 2005
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7,545,550 Systems and methods of actuating MEMS display elements 1 2005
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7,355,779 Method and system for driving MEMS display elements 1 2006
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TEXAS INSTRUMENTS INCORPORATED (2)
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7,196,684 Spatial light modulator with charge-pump pixel cell 3 2006
 
CHRISTIE DIGITAL SYSTEMS USA, INC. (1)
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VENTURE LENDING & LEASING IV, INC. (1)
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Other [Check patent profile for assignment information] (1)
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