The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 08, 1994
Filed:
Jul. 24, 1992
Dennis W Prince, Banks, OR (US);
Tektronix, Inc., Wilsonville, OR (US);
Abstract
A pair of infrared linked stereoscopic glasses (18) receives a train of short infrared pulses from a transmitter (26) of a stereoscopic imaging system (10). The rising edges of the infrared pulses are synchronized with the beginnings of the even numbered fields of a stereoscopic image displayed on a video display (14). In a stereo mode, the glasses provide a three-dimensional appearance because right and left liquid crystal cells (40 and 42) switch right- and left-eye pieces (20 and 22) between transmissive and opaque states synchronously with the even and odd fields of the stereoscopic image. In a flickerless mode, the right- and left-eye pieces are both essentially continuously transmissive. An optical state controller (36) is self-synchronizing in that a single pulse of the electrical pulse train signal will control the optical states of both the right- and left-eye pieces during a complete stereoscopic image. The transmitted IR pulses are not modulated and the electrical pulse train signal produced in response to the received IR pulses is not demodulated. The glasses automatically switch from stereo mode to flickerless mode when the glasses cease receiving the IR pulses. The glasses automatically switch from flickerless mode to stereo mode when the glasses begin to receive the IR pulses. The maximum voltage (VDD) applied to the electrodes (184, 186, 206, and 208) of the right and left liquid crystal cells is substantially higher in stereo mode than that in flickerless mode.