Wireless HMD Differential Rendering and Beamforming
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Solution Overview
Problem
Current head-mounted displays (HMDs) require wired connections for high-quality video transmission, which restricts user movement, detracts from the immersive experience, and poses tripping hazards due to the need for stable and high-bandwidth data transfer.
Innovation Solution
Implementing predictive RF beamforming that adjusts beamforming direction and angular spread based on the predicted future location and movement of the HMD, using inertial data and image capture to maintain a strong wireless signal and reduce data transmission bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wired connections are used for high-quality video transmission to HMDs, then data transmission stability and bandwidth are improved, but user mobility and immersion are degraded due to movement restrictions and tripping hazards
Solution Approach 1:
The patent replaces the mechanical wired connection system with a wireless RF transmission system. The rendering system transmits video frames wirelessly to the HMD using radio frequency communication, eliminating the physical cable that restricts user movement while maintaining high-quality video transmission through optimized rendering techniques that reduce bandwidth requirements.
2Ease of operation
If wireless transmission is used to enhance user mobility, then user immersion and mobility are improved, but data transmission stability and bandwidth are degraded
Solution Approach 1:
The patent segments the video content into two types: full-resolution frames for the current foveal region and lower-resolution predictive frames for peripheral regions. This segmentation allows wireless transmission to carry essential visual information at reduced bandwidth requirements, maintaining transmission stability while enabling wireless operation and user mobility.
Solution Approach 2:
The patent transmits only the necessary portion of visual information wirelessly - specifically, full-resolution data for the foveal region where the user is looking, while peripheral regions use predictive rendering with lower resolution. This partial transmission approach maintains adequate transmission quality over wireless channels while reducing bandwidth demands.
3Manufacturing precision
If high-resolution video is transmitted to maintain image quality, then visual fidelity is improved, but data bandwidth requirements increase, making wireless transmission difficult
Solution Approach 1:
The patent applies different quality levels to different regions of the visual field based on user gaze. The foveal region (where the user is looking) receives full-resolution, high-quality rendering, while peripheral regions use lower-resolution predictive rendering. This local quality differentiation maintains critical visual fidelity where needed while reducing overall bandwidth requirements for wireless transmission.
4Productivity
If predictive rendering is used to reduce bandwidth, then data transmission efficiency is improved, but image quality in non-foveal regions may be degraded
Solution Approach 1:
The patent uses predictive rendering to pre-generate peripheral frame content based on expected user gaze movements and scene context before the user actually looks in those directions. This preliminary action allows the system to prepare lower-resolution predictive frames in advance, maintaining data transmission efficiency while ensuring that when the user does look in peripheral regions, the content is already rendered and ready, minimizing perceived quality degradation.
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
Enables a stable and high-quality wireless data transmission to HMDs, enhancing user mobility and immersion by maintaining a strong signal and optimizing data transmission efficiency.
Implementation Method 1
adjusting a beamforming direction of an RF transceiver in a direction that is towards the predicted future location of the HMD
Data Source
AI summary
A method is provided, including: tracking a location of a head-mounted display (HMD); tracking a gaze of a user of the HMD; generating video depicting a view of a virtual environment for the HMD based on the gaze of the user of the HMD; initiating wireless transmission of the video to the HMD for display on the HMD to the user, wherein initiating the wireless transmission includes setting a beamforming of a wireless transceiver towards the location of the head-mounted display; processing signal quality feedback received from the HMD to determine a quality of the wireless transmission; responsive to a loss in the quality of the wireless transmission, then adjusting the beamforming of the wireless transceiver.