Staggered Dual Screen Timing for HMD Peak Current Reduction
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Solution Overview
Problem
Head-mounted displays (HMDs) face challenges in reducing peak current consumption during image display, leading to potential flickering, component damage, and reduced user experience due to the afterglow effect and simultaneous power supply requirements for dual screens.
Innovation Solution
The method involves staggering the display times of images on dual screens within a display cycle, allowing for intervals between frames and cycles to minimize peak current demand, thereby reducing power requirements and mitigating afterglow effects, while ensuring stable and high-brightness image presentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual display screens simultaneously display images in the same time period, then display productivity and user experience are improved, but peak current consumption increases causing flickering and component stress
Solution Approach 1:
The patent implements periodic action by alternating the display timing of first and second display screens within display cycles. Specifically, the first display screen displays in the first time period while the second display screen displays in the second time period, creating a periodic switching pattern that reduces simultaneous power demand while maintaining continuous display output.
Solution Approach 2:
The patent applies segmentation by dividing the display cycle into distinct time periods (first time period, second time period, and third time period) for different display operations. This temporal segmentation allows the system to manage power consumption by activating display screens in separate time slots rather than simultaneously, thereby reducing peak current requirements.
2Productivity
If images are displayed continuously without intervals, then display productivity is maximized, but afterglow effect causes smearing and blurring
Solution Approach 1:
The patent introduces periodic action by implementing a third time period without image display between the first and second display periods. This periodic interruption allows the human eye to clear the afterglow effect from previous frames, preventing smearing and blurring while maintaining high display productivity through efficient time utilization.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that image display occurs in multiple time periods within each display cycle, maximizing the utilization of display time while introducing strategic pauses to manage afterglow. The sum of all time periods equals the display cycle, ensuring continuous productive operation.
3Illumination intensity
If display brightness is increased to improve visibility, then user experience is enhanced, but peak current consumption increases risking component damage
Solution Approach 1:
The patent applies periodic action by alternating high-brightness display periods with lower-power periods. During the first and second time periods, the display screens operate at high brightness for optimal visibility, while the third time period provides a power reduction phase. This periodic pattern enables high display brightness to be achieved without sustained peak current consumption that would risk component damage.
Data Source
AI summary
An image display method for a head mounted display (300) is disclosed. The head mounted display (300) includes a first display screen (3011) and a second display screen (3012). In a first time period S1 of an ith display cycle T, the head mounted display (300) displays an ith frame of a first image on the first display screen (3011). After stopping displaying the ith frame of the first image, the head mounted display (300) displays an ith frame of a second image on the second display screen (3012) in a second time period S2 of T. After the second time period, no image is displayed on the first display screen (3011) and the second display screen (3012). According to the method, a peak current of a device when displaying an image can be reduced.