MR Device Flicker Elimination via Dynamic Frequency Synchronization
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Solution Overview
Problem
Existing mixed reality (MR) products fail to adequately address image flicker caused by ambient light flicker, leading to suboptimal user experiences due to frequency mismatches between display, camera, and rendering parameters.
Innovation Solution
An MR device and method that include a camera module and a display module, where the method dynamically adjusts the target shooting frequency of the camera module and controls the display module to match the ambient light flicker frequency, ensuring coherent image display and eliminating flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display module operates at a fixed refresh rate (e.g., 90Hz or 120Hz) and the camera module operates at a fixed shooting frequency (e.g., 60fps), then the device structure is simple and easy to control, but image flicker occurs under certain ambient light conditions due to frequency mismatch with the mains frequency (50Hz or 60Hz)
Solution Approach 1:
The patent implements dynamic frequency adjustment for both the display module and camera module. The display refresh rate and camera shooting frequency are no longer fixed but are dynamically adjusted based on detected ambient light flicker frequency. This allows the system to adapt to different lighting conditions (50Hz or 60Hz mains frequency) and eliminate image flicker by synchronizing the display and camera frequencies with the ambient light frequency, thereby resolving the contradiction between image stability and device complexity.
Solution Approach 2:
The patent changes the operational parameters (refresh rate and shooting frequency) of the display and camera modules based on detected ambient light conditions. By detecting the flicker frequency of ambient light and adjusting the display refresh rate and camera shooting frequency to match or be integer multiples of this frequency, the system eliminates image flicker. This parameter adaptation resolves the contradiction by making the system flexible enough to maintain image stability without requiring overly complex fixed-frequency control mechanisms.
2Reliability
If the refresh rate and shooting frequency are increased to exceed multiple times the mains frequency (e.g., >100Hz), then image quality and user experience improve, but power consumption increases and device heat generation increases
Solution Approach 1:
The patent dynamically adjusts the refresh rate and shooting frequency parameters based on the detected ambient light flicker frequency. Instead of always operating at high frequencies (>100Hz) to ensure image quality, the system adjusts frequencies to match the ambient light frequency (50Hz or 60Hz) or its integer multiples. This adaptive parameter adjustment maintains image quality by eliminating flicker while reducing power consumption and heat generation compared to always using high frequencies.
Solution Approach 2:
The system performs self-adjustment by detecting the ambient light flicker frequency and automatically setting appropriate refresh rates and shooting frequencies. This self-service capability allows the device to optimize its own power consumption and thermal performance by selecting the minimum necessary frequencies to eliminate flicker, rather than requiring constant high-frequency operation for image quality.
3Use of energy by moving object
If the refresh rate and shooting frequency are kept low (e.g., ≤100Hz), then power consumption is reduced, but image flicker becomes visible to the naked eye under certain ambient light conditions
Solution Approach 1:
The patent dynamically changes the refresh rate and shooting frequency parameters based on detected ambient light flicker frequency. When ambient light flicker is detected (at 50Hz or 60Hz), the system adjusts the display refresh rate and camera shooting frequency to match or be integer multiples of this frequency. This parameter adaptation eliminates visible image flicker while maintaining relatively low power consumption, resolving the contradiction between power savings and flicker elimination.
Solution Approach 2:
The system uses feedback from ambient light detection to adjust display and camera frequencies. By detecting the flicker frequency of ambient light and using this information to set appropriate refresh rates and shooting frequencies, the system ensures that low-frequency operation does not result in visible flicker. This feedback mechanism allows the system to maintain low power consumption while eliminating the harmful flicker effect.
4Ease of operation
If the display refresh rate and camera shooting frequency are not synchronized with ambient light flicker frequency, then device control is simple, but visible flicker occurs in captured and displayed images
Solution Approach 1:
The patent dynamically adjusts the display refresh rate and camera shooting frequency parameters based on detected ambient light flicker frequency. Instead of using fixed frequencies that may not synchronize with ambient light, the system changes these parameters to match the ambient light frequency (50Hz or 60Hz) or its integer multiples. This automatic parameter synchronization eliminates visible flicker while keeping the control mechanism relatively simple through automated detection and adjustment.
Solution Approach 2:
The system automatically detects ambient light flicker frequency and self-adjusts the display and camera frequencies to synchronize with it. This self-service capability eliminates the need for complex manual frequency synchronization while preventing visible flicker. The device performs its own frequency coordination by detecting ambient conditions and adjusting its operational parameters accordingly, resolving the contradiction between ease of operation and flicker elimination.
Data Source
AI summary
The disclosure provides an MR device and a method for eliminating image flicker in an MR device. The method includes: in response to a presence of ambient light flicker that triggers human eye perception, determining a flicker frequency of the ambient light flicker; determining whether the display module has a specific operating frequency according to a working status of the MR device; in response to having the specific operating frequency and a mismatch between the specific operating frequency and the flicker frequency, controlling the display module to display target images at the specific operating frequency at all times, and at least dynamically adjusting a target shooting frequency of the camera module according to the flicker frequency and the specific operating frequency; and controlling the camera module to obtain original images at the target shooting frequency, and the target image is obtained at least based on the original image.