Auto-Focusing Head Mount Display for Open-Type Eye Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Open-type head mount display devices are cumbersome to operate and provide a poor display experience due to the need for frequent manual adjustment of the focal distance to match changing object distances of external objects with the display image distance, leading to image obscurity.
Innovation Solution
An open-type head mount display device that includes a display unit, a focusing lens unit for adjusting the object distance of the display image, an image acquisition unit for capturing the user's eye images, a focal distance analyzing unit to calculate the user's focal distance, and a lens adjusting unit to automatically adjust the focusing lens position to match the display image distance with the user's focal distance, ensuring clear display of both images and external objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment of focusing lens position is used to match display image distance with external object distance, then the display image can be clear, but the operation becomes cumbersome and user experience deteriorates
Solution Approach 1:
The system automatically detects the user's focal distance through image capture and analysis, then self-adjusts the focusing lens position without requiring manual user intervention. This transforms the manual adjustment process into an automated self-service system, resolving the contradiction between focus accuracy and operation convenience.
Solution Approach 2:
The system implements a feedback loop where the image acquisition unit captures the user's eye or displayed object, the focal distance analyzing unit processes this visual feedback to determine focal distance, and the lens adjusting unit uses this information to adjust the focusing lens position. This closed-loop feedback mechanism ensures accurate focus matching while eliminating manual operation.
2Measurement precision
If the focusing lens unit is manually adjusted to match focal distance with object distance, then clear display is achieved, but response time to changing objects deteriorates
Solution Approach 1:
The system continuously captures images and analyzes focal distance in advance, preparing the focusing lens position before the user actually needs to view the next object. This preliminary action ensures that when the user shifts attention to a new object, the focusing lens is already positioned optimally, eliminating adjustment delays while maintaining focus accuracy.
Solution Approach 2:
The image acquisition unit operates continuously to monitor the user's viewing state, and the focal distance analyzing unit continuously processes this data. This continuous operation ensures that the system is always ready to adjust the focusing lens position, eliminating idle time and maintaining both focus accuracy and rapid response to changing viewing conditions.
3Ease of operation
If automatic focal distance detection and lens adjustment is implemented, then operation simplicity and response speed improve, but device complexity increases
Solution Approach 1:
The image acquisition unit serves multiple functions: it captures the user's eye for focal distance detection, captures displayed objects for analysis, and can potentially serve other diagnostic or control functions. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while enabling automatic focal distance detection and adjustment.
Solution Approach 2:
The patent combines the image acquisition, focal distance analysis, and lens adjustment control functions into an integrated system. The image acquisition unit's output is directly fed to the focal distance analyzing unit, which in turn controls the lens adjusting unit, creating a merged automated control system that reduces overall system complexity compared to having separate manual adjustment mechanisms plus detection systems.
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 enables simple and automatic operation, maintaining clear images and good display effects by timely adjusting the focal distance to match the user's changing eye focus, eliminating the need for manual user intervention.
Implementation Method 1
The focusing lens unit 3 is arranged in the propagation path of the light rays of the display image, and each focusing lens unit 3 comprises one or more focusing lenses, and in addition to adjusting the object distance of the display image, the focusing lens unit 3 also has the effects of amplifying the display image, flipping the display image and the like.
Implementation Method 2
an display image emitted by the display unit can reach a user's eye (the user's eye present in the text refers to the left eye 8a of the user and/or the right eye 8b of the user) after being reflected by a reflection unit (including a series of reflectors 21 and 22)
Data Source
AI summary
The present invention provides an open-type head mount display device and a display method thereof. The open-type head mount display device according to the present invention comprises a display unit for generating display images; a focusing lens unit for adjusting the object distance of a display image from a user's eye; an image acquisition unit for acquiring the image of the two eyes of the user; a focal distance analyzing unit for obtaining the focal distance of the user's eye according to the image of the two eyes of the user; and a lens adjusting unit for adjusting the position of the focusing lens unit in the light ray propagation direction of the display image according to a control command from the analyzing unit, so that the object distance of the display image is matched with the current focal distance of the user's eye.