Position Error Measurement in Extended Reality Mobile Display Devices
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Solution Overview
Problem
Virtual-reality headsets experience latency issues when receiving display data from host devices, leading to position errors and poor user experience due to delays in image movement synchronization, especially in wireless connections.
Innovation Solution
A method to determine the relative position and orientation of a mobile display device by transmitting and receiving signals at specific times, calculating the difference in position and orientation, and correcting display data accordingly to synchronize image movement with user motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If display data is transmitted from host device to mobile display device, then the mobile device can receive and display images, but latency is introduced causing position error and poor user experience
Solution Approach 1:
The system performs preliminary actions by determining position and orientation at transmit time, predicting the expected position at receive time, and calculating position error before display. This allows the system to pre-compensate for latency by adjusting display data based on predicted position differences, rather than reacting after the delay occurs.
Solution Approach 2:
The system establishes a feedback loop where position error is continuously measured by comparing expected position (based on transmit time data) with actual position (determined at receive time). This feedback is used to dynamically adjust display data compensation, creating a closed-loop system that continuously optimizes for minimal position error and latency impact.
2Measurement precision
If signal transmission frequency is increased to reduce position error, then measurement accuracy improves, but device complexity and energy consumption increase
Solution Approach 1:
The system dynamically adjusts signal transmission frequency based on measured position error and latency conditions. When position error exceeds thresholds or latency increases, the system increases transmission frequency to improve measurement accuracy. When conditions are stable, it reduces frequency to minimize energy consumption and device complexity, creating an adaptive system that optimizes performance based on real-time conditions.
Data Source
AI summary
A method of determining relative position of an extended reality mobile display device connected to receive display data from a host device involves determining (S31), by the extended reality mobile display device, a position and orientation of the extended reality mobile display device at a transmit time and transmitting (S32) a first signal to the host device at the transmit time. The extended reality mobile display device then receives (S35) at a receive time a second signal transmitted (S34) from the host device upon receipt (S33) of the first signal. The extended reality mobile display device determines (S36) a position and orientation of the extended reality mobile display device at the receive time and determines a difference (S37) in the position and orientation of the extended reality mobile display device between the transmit and receive times. The extended reality mobile display device then corrects display data received from the host device based on the determined difference in the position and orientation of the extended reality mobile display device, and displays the corrected display data.