Stereo synchronizing signal generator for liquid crystal shutter glasses

• US 6,687,399 B1
• Filed: 08/03/2000
• Issued: 02/03/2004
• Est. Priority Date: 08/03/2000
• Status: Expired due to Term

• Current Assignee: Silicon Integrated Systems Corporation (Silicon Integrated Systems Corporation Taiwan)
• Original Assignee: Silicon Integrated Systems Corporation (Silicon Integrated Systems Corporation Taiwan)
• Inventors: Yet, Kwo-woei, Yuan, Jen-min, Chuang, Chien-tsung
• Primary Examiner(s): Mehta, Bhavesh M.
• Assistant Examiner(s): Kassa, Yosef
• Application Number:
  US09/632,496
• Time in Patent Office: 1,279 Days
• Field of Search: 382/117, 382/128, 382/154, 382/206, 382/207, 382/209, 382/218, 382/219, 382/278, 382/285, 382/286, 382/291, 382/293, 382/294, 382/295, 382/151, 382/208, 382/287, 382/305, 345/419, 345/598, 345/653, 345/654, 345/757, 345/836, 345/848, 345/850, 345/852, 348/51, 348/481, 348/43, 348/47, 348/56, 348/53, 348/311, 356/12, 356/16, 356/17, 356/22
• US Class Current: 382/154
• CPC Class Codes: H04N 13/341 using temporal multiplexing

Abstract

A stereo synchronizing signal generator for liquid crystal shutter glasses is provided. The stereo synchronizing signal generator includes a signal generating unit to generate preliminary shuttering signals according to an image vertical synchronizing signals and a start signal. A signal delaying unit is provided to delay the preliminary shuttering signals according to a value, which can be changed by users. Then an output unit is provided to transmit the delayed shuttering signals to the liquid crystal shutter glasses. Due to that the signal generating unit generates a predetermined shuttering signal, such as right eye shuttering signal, at the rise edge of the start signal, the shuttering signals can always match up to the right image. Furthermore, the signal delaying unit can adjust the timing of the shuttering signal according to the value of the register, therefore the shuttering signals can always be synchronized with the image.

Claims

1. An apparatus of generating stereo synchronizing signal for liquid crystal shutter glasses, comprising:

a signal generating unit for generating preliminary shuttering signals according to an image vertical synchronizing signals and a start signal;

a signal delaying unit connected to said signal generating unit for delaying said preliminary shuttering signals and outputting delayed shuttering signals;

an output unit connected to said signal delaying unit for transmitting the delayed shuttering signals to the liquid crystal shutter glasses;

a register for storing a value to control the delay timing of said signal delaying unit; and

a timing unit for receiving a retarding signal and a leading signal so as to change the value in said register.

2. The apparatus as claimed in claim 1 further comprising a signal reverse unit connected between the signal generating unit and said signal delaying unit for reversing the preliminary shuttering signals according to a reverse signal.

3. The apparatus as claimed in claim 1 further comprising a signal reverse unit connected between the signal delaying unit and output unit for reversing the delayed shuttering signal according to a reverse signal.

4. The apparatus as claimed in claim 1, wherein said output unit comprises an IR transmitter to convert the delayed shuttering signals into IR signals.

5. The apparatus as claimed in claim 4, wherein said IR transmitter transmits the IR signals with two different frequencies to indicate the different levels of said delayed shuttering signals.

6. An apparatus of generating stereo synchronizing signal for liquid crystal shutter glasses, comprising:

a signal generating unit for generating preliminary shuttering signals according to an image vertical synchronizing signal and a start signal;

a signal delaying unit connected to said signal generating unit for delaying said preliminary shuttering signals and outputting delayed shuttering signals;

an output unit connected to said signal delaying unit for transmitting the delayed shuttering signals to the liquid crystal shutter glasses;

a register for storing a value to control the delay timing of said signal delaying unit; and

a human-to-machine interface for inputting a retarding signal and a leading signal into the register so as to change the value in said register.

7. The apparatus as claimed in claim 6 further comprising a signal reverse unit connected between the signal generating unit and said signal delaying unit for reversing the preliminary shuttering signals according to a reverse signal.

8. The apparatus as claimed in claim 6 further comprising a signal reverse unit connected between the signal delaying unit and output unit for reversing the delayed shuttering signal according to a reverse signal.

9. The apparatus as claimed in claim 6, wherein said output unit comprises an IR transmitter to convert the delayed shuttering signals into IR signals.

10. The apparatus as claimed in claim 9, wherein said IR transmitter transmits the IR signals with two different frequencies to indicate the different levels of said delayed shuttering signals.