3D Shutter Glasses Frame Rate Detection via Optical Detectors
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Solution Overview
Problem
Current 3D glasses technologies for synchronizing with 3D televisions are inefficient and expensive, relying on infrared links that require dedicated transmitters and receivers.
Innovation Solution
3D glasses equipped with multiple optical detectors, such as photodiodes, that analyze brightness changes to infer the frame rate of the display and synchronize active shutter lenses without a dedicated synchronization signal, using techniques like Independent Component Analysis to reject noise from other light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If infrared link with dedicated transmitters and receivers is used for synchronization, then synchronization reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the synchronization function from the dedicated infrared link system and implements it through optical detectors that passively detect display frame rate fluctuations. This removes the need for active transmitters and receivers while maintaining synchronization capability, directly reducing device complexity and cost while preserving reliability
Solution Approach 2:
The optical detectors enable the glasses to self-synchronize by automatically detecting the display's frame rate variations and adjusting their shutter timing accordingly. This eliminates the need for external synchronization signals and dedicated communication hardware, allowing the system to synchronize itself passively
2Reliability
If infrared link with dedicated transmitters and receivers is used for synchronization, then synchronization reliability is improved, but cost increases
Solution Approach 1:
The patent replaces expensive dedicated infrared transmitters and receivers with inexpensive optical detectors that can be mass-produced. These simple photodetector-based components significantly reduce manufacturing costs while maintaining the synchronization function through passive detection of display frame rate fluctuations
3Device complexity
If optical detectors are used to detect brightness changes for synchronization, then device complexity is reduced, but measurement precision may worsen due to noise from environmental light sources
Solution Approach 1:
The patent segments the optical detection function into multiple detectors positioned at different orientations. Each detector captures light from specific directions, allowing the system to distinguish between display frame rate signals and environmental noise by analyzing the spatial pattern of detected brightness changes
Solution Approach 2:
The patent applies local quality by orienting optical detectors in specific directions to preferentially detect light from the display while minimizing environmental interference. Different detectors are positioned to capture light from different angles, creating localized detection zones that enhance signal specificity and reduce noise
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for efficient and cost-effective synchronization of active shutter lenses with 3D displays, eliminating the need for specialized transmitters and receivers, and effectively rejecting noise from environmental and other light sources.
Implementation Method 1
multiple optical detectors, such as photodiodes, that analyze brightness changes
Data Source
AI summary
Active shutter 3D glasses with multiple optical detectors, such as photodiodes, are described that detect a frame rate of a 3D television or other 3D display by using independent component analysis. The detected frame rate is used to update a clock onboard the 3D glasses that times the active shutters, thereby synchronizing the shutters to the 3D display. A switch can reverse the shutters in case the left eye/right eye images are shown oppositely.