# US 6,724,352 B1 · Apparatus for controlling LCD shutter glasses

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- Number: US 6,724,352 B1
- Document ID: US6724352B1
- Status: Granted
- Kind: B1
- Application number: 09/417,407
- Filed: 1999-10-13
- Granted: 2004-04-20
- Earliest claimed: 1999-03-16
- Assignees: ASUSTeK COMPUTER INC.
- Inventors: Chih-Peng Wu
- Web page: https://patentgrep.com/patent/US6724352B1

## CPC

- G03B 35/16: by sequential viewing
- G02B 30/24: involving temporal multiplexing, e.g. using sequentially activated left and right shutters
- H04N 2213/008: Aspects relating to glasses for viewing stereoscopic images
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An apparatus for controlling liquid-crystal-display (LCD) shutter glasses for making the right and left LCD-type shutter of the LCD shutter glasses transparent alternately. An observer who wears the LCD shutter glasses controlled by the apparatus will experience the three-dimensional effect if the alternately transparent speed of the right and left LCD-type shutter is matched with the vertical synchronization signal. The apparatus for controlling liquid-crystal-display (LCD) shutter glasses comprises a first means, a second means, and a third means. The first means is responsive to a vertical synchronization signal and generates a light-passing enable signal. The second means could generate a first voltage signal. The third means is responsive to the light-passing enable signal and the first voltage signal to generate a first and a second controlling signals to control the left and the right LCD-type shutters such that a three dimension image effect is observed by the observer.

## Claims

### Claim 1

An apparatus for controlling a viewing apparatus, said viewing apparatus including a right and a left LCD-type shutter and for presenting an image to an observer wearing said viewing apparatus, comprising:
a first means, responsive to only a vertical synchronization signal, for generating a light-passing enable signal;
a second means for generating a first voltage signal, where said second means includes an oscillation-circuit means for generating a second voltage signal, and a frequency-dividing means, responsive to said second voltage signal, for generating said first voltage signal; and
a third means, responsive to said light-passing enable signal and said first voltage signal, for generating a first and a second controlling signal to control the left and the right LCD-type shutters such that a three-dimensional image effect is created.

### Claim 2 (depends on 1)

An apparatus for controlling a viewing apparatus in claim 1, wherein said first means reduces the frequency of said vertical synchronization signal to generate said light-passing enable signal.

### Claim 3

An apparatus for controlling a viewing apparatus, said viewing apparatus including a right and a left LCD-type shutter for presenting an image to an observer wearing said viewing apparatus, comprising:
a first means, responsive to a vertical synchronization signal, for generating a light-passing enable signal;
a second means for generating a first voltage signal, where said second means includes an oscillation-circuit means for generating a second voltage signal, and a frequency-dividing means, responsive to said second voltage signal, for generating said first voltage signal; and
a third means, responsive to said light-passing enable signal and said first voltage signal, for generating a first and a second controlling signal to control the left and the right LCD-type shutters such that a three-dimensional image effect is created.

### Claim 4 (depends on 3)

An apparatus for controlling a viewing apparatus in claim 3, wherein said first means reduces the frequency of said vertical synchronization signal to generate said light-passing enable signal.