3D Shutter Glasses Synchronization via Bluetooth Slave Clock
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Solution Overview
Problem
Conventional 3D shutter glasses struggle to synchronize accurately with television refresh rates, leading to potential crosstalk and undesirable visual effects during the viewing of 3D video content.
Innovation Solution
A system and method that utilize a wireless communication link, specifically Bluetooth, to synchronize 3D shutter glasses with a 3D video display device, generating a slave clock based on the display device's master clock to ensure precise timing of left and right shutter operations, allowing for the synchronization of shutters with the display of 3D video frames, including blank frames to mitigate crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional 3D shutter glasses are used without precise synchronization, then the system is simpler to implement, but crosstalk and visual artifacts occur
Solution Approach 1:
The patent introduces a wireless communication intermediary (Bluetooth module) that transmits timing signals from the display device to the shutter glasses. This mediator enables precise synchronization without requiring complex direct coupling or manual calibration, resolving the contradiction by adding a communication layer that simplifies the overall system integration while achieving high synchronization accuracy
Solution Approach 2:
The patent replaces mechanical or manual synchronization methods with electronic timing signals transmitted via wireless communication. The display device generates precise timing signals that are wirelessly received by the shutter glasses, eliminating the need for mechanical adjustment mechanisms or manual synchronization procedures, thus improving reliability without proportionally increasing device complexity
2Adaptability or versatility
If the shutter refresh rate is doubled for 3D viewing, then the left and right eye images can be displayed alternately, but the synchronization difficulty increases
Solution Approach 1:
The patent implements a feedback mechanism where the display device continuously transmits timing signals to the shutter glasses via wireless communication. The shutter glasses receive these timing signals and adjust their shutter operations accordingly, ensuring precise synchronization with the doubled refresh rate. This feedback loop maintains timing precision even at higher refresh rates by constantly updating the shutter timing based on the display device's current state
Solution Approach 2:
The patent utilizes periodic timing signals transmitted from the display device to the shutter glasses. These periodic signals correspond to the doubled refresh rate and provide regular synchronization cues that enable the shutter glasses to maintain precise timing for alternating left and right eye images. The periodic nature of the timing signals simplifies the synchronization process while supporting the higher refresh rate required for 3D viewing
3Reliability
If blank frames are inserted to mitigate crosstalk, then the viewing quality improves, but the display time for actual content decreases
Solution Approach 1:
The patent inserts blank frames between left and right eye images as a preliminary action to prevent crosstalk before it can occur. These blank frames act as a preventive measure, ensuring that the shutter glasses have sufficient time to switch between eyes without displaying the wrong image to the wrong eye. The timing signals include instructions for these blank frames, and the system maintains precise timing to minimize the impact on overall content display efficiency
Data Source
AI summary
A 3D shutter glasses device, coupled via a wireless link to a 3D video display device, maintains a slave clock synchronized with a master clock in the display device. The clocks may comprise Bluetooth clocks. The shutter glasses receive 3D frame display information and time information referenced to the master clock that corresponds to when frames are displayed. The shutter glasses control opening and closing of left and right shutters utilizing slave clock time and the received information. The received display information comprises left, right and/or blank frame pattern information, a frame pattern time interval, a frame refresh rate and a time offset for delaying opening and/or closing of shutters. The time information indicates master clock time when frames are displayed. The shutter glasses and the display maintain synchronization when display and/or time information updates are skipped. The shutter glasses may transmit information to the display device.