HMD Lamp Light Adjustment via Photodetector Feedback
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Solution Overview
Problem
Conventional near-to-eye optical systems in head-mounted displays (HMDs) are limited by cost, size, weight, field of view, and efficiency, which restrict their practical and leisure applications.
Innovation Solution
A system and method for adjusting lamp light brightness and color balance in HMDs using a controller coupled with photodetectors and light emitting diodes (LEDs) to measure ambient light and adjust emission times, ensuring correct brightness and color balance of computer-generated imagery (CGI) displayed to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional optical systems are used in HMDs, then the basic display function is achieved, but the efficiency and effectiveness are limited
Solution Approach 1:
The system employs photodetectors to measure ambient light conditions and feeds this information back to a controller, which dynamically adjusts LED emission parameters. This closed-loop feedback mechanism optimizes light output efficiency by adapting to real-time environmental conditions, directly resolving the efficiency limitation of conventional static optical systems.
Solution Approach 2:
The patent transforms the static light output of conventional systems into a dynamic system where LED emission times and intensities are continuously adjusted based on ambient light measurements. This dynamic adaptation allows the display to optimize its efficiency and effectiveness by matching output characteristics to environmental conditions.
2Adaptability or versatility
If fixed brightness and color are used in display, then device complexity is reduced, but adaptability to different ambient conditions deteriorates
Solution Approach 1:
Photodetectors continuously monitor ambient light conditions and provide feedback to the controller, enabling automatic adaptation to varying environmental lighting. This feedback loop provides versatility in adapting to different ambient conditions without requiring complex manual intervention or overly complicated control mechanisms.
Solution Approach 2:
The system performs self-adjustment by using photodetectors to sense ambient conditions and automatically modifying LED emission parameters through controller processing. This self-service capability provides adaptability to different environments while keeping the control system relatively simple, as the system autonomously manages its own optimization without external intervention.
3Reliability
If dynamic light adjustment is implemented, then display effectiveness is improved, but device complexity increases
Solution Approach 1:
The feedback mechanism using photodetectors and controllers ensures reliable and effective display output by continuously adapting to ambient conditions. The complexity introduced by this feedback system is justified by the significant improvement in display effectiveness, as the system reliably optimizes visibility and color accuracy across varying environmental conditions.
Solution Approach 2:
The controller serves multiple functions: processing photodetector signals, determining optimal emission times, adjusting LED intensity, and maintaining color balance. This multi-functionality consolidates what could be multiple separate components into a single controller, improving display effectiveness while limiting the increase in overall system complexity through functional integration.
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
The solution enhances the efficiency and effectiveness of HMDs by dynamically adjusting light output based on ambient conditions, improving the display's brightness and color accuracy, thereby expanding their application potential.
Implementation Method 1
A system and method for adjusting lamp light for a display are described herein
Implementation Method 2
A system and method for adjusting lamp light for a display are described herein
Data Source
AI summary
An apparatus includes a light source, a display array, a light relay, a photodetector, control circuitry, and measurement circuitry. The light source is for providing lamp light during an ON-time of the light source. The display array is positioned to receive and selectively manipulate the lamp light. The light relay is positioned to receive the image light from the display array. The photodetector is optically coupled to receive light. Control circuitry is coupled to the light source for cycling the light source and coupled to the measurement circuitry for coordinating light measurements of the photodetector.