HMD Optical Distance Adjustment Mechanism
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Solution Overview
Problem
Head-mounted display devices have a fixed distance between the user's eyes and the image forming position, which is not optimally adjusted based on the content being displayed and individual eyesight, leading to suboptimal viewing experiences.
Innovation Solution
Incorporating video display elements and optical elements with a control mechanism that adjusts the optical distance between the video display elements and optical elements, allowing for dynamic adjustment of the image forming position to optimize the viewing experience based on the content and user's eyesight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed optical distance is used between video display elements and optical elements, then the device structure is simple, but the image forming distance cannot be optimized for different content and user eyesight
Solution Approach 1:
The patent implements a movable video display element that can adjust its position along the optical axis relative to the optical elements. This dynamic positioning capability allows the image forming distance to be changed according to different content types and user eyesight requirements, resolving the contradiction between adaptability and device complexity by introducing a single degree of freedom movement mechanism
2Adaptability or versatility
If the video display element is made movable to adjust image forming distance, then adaptability improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the display unit into separable components: a movable video display element and a fixed optical element assembly. This segmentation allows independent optimization of each component and simplifies the overall assembly process, as the movable element can be adjusted and positioned without affecting the structural integrity of the entire device
Solution Approach 2:
The patent introduces a movable support structure as an intermediary mechanism between the video display element and the optical elements. This intermediary component facilitates the adjustment function while maintaining simple connections to both the display element and the housing, reducing manufacturing complexity
3Ease of operation
If a control mechanism is added to adjust optical distance, then viewing comfort improves, but device weight and complexity increase
Solution Approach 1:
The patent implements a user-operated adjustment mechanism where the user directly controls the position of the video display element through manual operation. This self-service approach eliminates the need for motors, sensors, or automated control systems, thereby maintaining lightweight construction while providing adjustable viewing comfort for different user needs
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
Enables adjustable image forming distances to improve the clarity and comfort of video viewing, accommodating different content types and individual eyesight variations, enhancing the overall user experience.
Implementation Method 1
optical elements arranged in front of user's eyes to cause video shown by video display elements to be incident on user's eyes
Data Source
AI summary
There is provided a head-mounted display device capable of adjusting a distance to an image forming position that includes video display elements that show a video, optical elements arranged in front of user's eyes to cause the video shown by the video display elements to be incident on the user's eyes, and a control mechanism that changes an optical distance between the video display elements and the optical elements. Also provided is a video display system that includes the head-mounted display device and a video supply device that includes a video supply section that supplies a video to the head-mounted display device and an image forming distance control section that outputs a control instruction to change a distance from the optical elements to the image forming position by operating the control mechanism.