LED Control Circuitry for XR HMD Illumination Monitoring
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Solution Overview
Problem
Existing light-emitting diode (LED) control systems in artificial reality head-mounted displays (HMDs) struggle to continuously monitor and regulate the output current of LEDs, which is crucial for maintaining optimal illumination and movement tracking.
Innovation Solution
The implementation of LED control circuitry that continuously monitors the output current provided to the LEDs in an HMD. If the integral of the output current over time exceeds a threshold, the circuitry latches the current to the LEDs, ensuring consistent illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LED control circuitry continuously monitors and regulates output current, then illumination consistency and movement tracking performance are improved, but device complexity and power consumption increase
Solution Approach 1:
The patent implements a feedback mechanism where the control circuitry continuously monitors the output current of the LEDs and adjusts the drive signal accordingly. The processor receives feedback about LED performance and modifies the current supply to maintain consistent illumination levels, directly resolving the technical contradiction between reliability and complexity by using intelligent control algorithms.
Solution Approach 2:
The control circuitry is designed to autonomously regulate LED current without requiring external intervention. The system self-adjusts by comparing actual LED output against target parameters and automatically correcting deviations, reducing the need for complex external control systems while maintaining illumination consistency.
2Measurement precision
If LED control circuitry continuously monitors and regulates output current, then movement tracking accuracy is improved, but power consumption increases
Solution Approach 1:
The control circuitry employs periodic monitoring and regulation of LED output current rather than continuous operation at full precision. The system periodically adjusts current levels based on detected movement patterns, maintaining tracking accuracy when motion is detected while reducing power consumption during static periods, thus resolving the contradiction between measurement precision and energy usage.
Solution Approach 2:
The system dynamically adjusts its monitoring and regulation intensity based on operational conditions. When movement is detected, the control circuitry increases monitoring precision and regulation frequency to maintain tracking accuracy. When no movement is detected, it reduces power consumption by lowering monitoring intensity, effectively balancing measurement precision with energy efficiency.
Data Source
AI summary
Aspects of the present disclosure are directed to systems and methods for controlling light emitting diodes (LEDs) in an electronic device, such as an artificial reality (XR) head-mounted display (HMD) or other XR device in an XR system. In an XR HMD, the LEDs can be positioned proximate to and/or facing the eyes and/or face of a user to illuminate such features for movement tracking and other purposes. Implementations can provide LED control circuitry that can continuously monitor the output current provided to the LEDs. If the integral of the output current over time exceeds a threshold current, implementations can latch the current to the LEDs.