HMD Display Unit Viewpoint Tracking for Quality Uniformity
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Solution Overview
Problem
Head mount display devices often exhibit varying display quality between the center and edge of the display unit due to optical lens differences, causing users to notice quality degradation when moving their gaze.
Innovation Solution
A head mount display device with a viewpoint detector and controller system that moves the display unit and generates compensation images to maintain the user's viewpoint at the center, ensuring uniform display quality by calculating and adjusting the display unit's position and image based on detected viewpoint displacement information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display unit uses optical lenses to display images, then the display can cover a wide area and provide immersive viewing, but the display quality varies between the center and edge due to optical lens differences
Solution Approach 1:
The patent implements a movable display unit that can dynamically adjust its position along the optical axis based on the user's viewpoint. The display unit is driven by a driving unit (such as a voice coil motor) to move forward or backward, allowing the system to adapt to different viewing conditions and maintain optimal display quality across the display area.
Solution Approach 2:
The system uses a viewpoint detector (such as a camera or sensor) to detect the user's eye position and generate viewpoint information. This feedback is processed by a controller that calculates the appropriate movement distance and direction for the display unit, creating a closed-loop control system that continuously adjusts the display position to maintain quality uniformity.
2Device complexity
If the display unit remains stationary, then the device structure is simple and stable, but the user experiences quality degradation when moving their gaze from the center to the edge
Solution Approach 1:
The display unit is designed with movable components that allow it to adjust its position dynamically. A driving unit (such as a voice coil motor or piezoelectric actuator) enables precise movement of the display unit along the optical axis, transforming a static structure into a dynamic one that can compensate for viewpoint variations.
Solution Approach 2:
The system changes the positional parameter of the display unit based on detected viewpoint information. The controller calculates the required position adjustment and drives the display unit to move to the optimal position, thereby changing the physical parameter (position) to maintain display quality uniformity across different viewing angles.
3Manufacturing precision
If the display unit moves to track the user's viewpoint, then display quality uniformity is improved, but the device requires additional moving components and control mechanisms
Solution Approach 1:
The patent introduces a controller as an intermediary component that processes viewpoint information from the viewpoint detector and generates appropriate driving signals. This intermediary layer coordinates the interaction between the detection system and the moving components, simplifying the overall control logic and reducing the complexity of direct coupling between sensors and actuators.
Solution Approach 2:
The system replaces complex mechanical tracking mechanisms with a more simplified approach using electromagnetic actuators (such as voice coil motors) that can achieve precise positioning with fewer mechanical components. This substitution reduces mechanical complexity while maintaining the ability to track and adjust to user viewpoints.
Data Source
AI summary
A head mount display (HMD) device includes: a display unit configured to display an image to a user based on an image signal; a viewpoint detector configured to detect a viewpoint corresponding to an object of the user's focus and configured to generate a viewpoint signal; and a controller configured to move the display unit based on the viewpoint signal and to generate a compensation image signal corresponding to the viewpoint signal such that the object of the user's focus is at a center of the display unit.