Head Mount Display Independent Optic Module Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head mount display devices struggle to adjust focus and interpupillary distance accurately, leading to discomfort and dizziness, especially for users with varying eyesight or contact lens wear, as they fail to independently adjust focal distances and distances between eyes effectively.
Innovation Solution
The head mount display device incorporates a focus adjusting unit with a screw thread and friction groove system, and a horizontal adjusting unit with a rail and magnet mechanism, allowing independent control of left and right optic modules to align with individual interpupillary distances and eyesight, ensuring precise focal distance adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a motor mechanism is provided to adjust focal distance sharply, then focus adjustment precision is improved, but device complexity and wearing comfort deteriorate
Solution Approach 1:
The patent replaces motor-driven mechanical adjustment mechanisms with a lens having a gradient refractive index. The gradient index lens automatically provides continuous focus adjustment without requiring external motors or complex mechanical structures, thereby improving focus precision while reducing device complexity and enhancing wearing comfort.
2Device complexity
If focal distance is fixed, then device structure is simplified, but adaptability to different users' eyesight deteriorates
Solution Approach 1:
The patent employs a lens with gradient refractive index where the refractive index varies continuously through the lens thickness. This parameter change enables the lens to provide multiple focal points simultaneously, allowing the device to adapt to different users' eyesight requirements while maintaining a simple fixed structure without moving parts.
3Device complexity
If interpupillary distance cannot be adjusted, then device structure is simpler, but measurement precision of eye alignment deteriorates
Solution Approach 1:
The patent divides the adjustment function into two independent segments: the gradient index lens handles focus adjustment for different eyesight, while a separate mechanical structure enables interpupillary distance adjustment. This segmentation allows each component to specialize in one function, achieving precise eye alignment without requiring complex integrated adjustment mechanisms.
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
This solution enables comfortable 3D image viewing by allowing users to adjust focus and interpupillary distance independently, accommodating different eyesight and reducing dizziness, while maintaining a simple and cost-effective structure.
Implementation Method 1
a lens (250) having a gradient index, viewed from a lateral direction, having a higher refractive index at a center than at a surface
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A head mount display device including a housing comprising a closed, front side and a back side having an opening, a pair of optic modules arranged horizontally and a head fixing unit configured to fix the housing to a user's head is provided. Each of the optic modules includes a display provided in the housing; a barrel comprising one side arranged in the housing and the other side exposed outside the housing via the opening; a lens fixed to the barrel; a focus adjuster configured to adjust a distance between the barrel and the display; and a horizontal adjusting unit configured to guide horizontal movement of the optic module, and the focus adjuster and the horizontal adjusting unit provided in one of the optic modules is operable independently from the focus adjuster and the horizontal adjusting unit provided in the other optic module.