Head Mounted Display Light Path Converter for Wide Viewing Angle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional head-mounted display devices have limited viewing angles, and increasing the size of the display module to enhance this results in increased volume and mass, causing user inconvenience.
Innovation Solution
A head-mounted display device design incorporating a lens assembly, a main display module, a sub-display module, and a light path converter, including a reflective type diffraction grating, to expand the viewing angle without increasing the device's volume or mass, by redirecting light paths to focus images at the user's eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the size of the display module is increased to increase the viewing angle, then the viewing angle is improved, but the volume and mass of the head mounted display device increase
Solution Approach 1:
The patent introduces a light path converter that redirects light from a small display module through a different spatial dimension (using reflective elements at specific angles) to achieve a wide viewing angle. This allows the system to obtain the viewing angle benefit of a large display without actually increasing the display module size, thereby resolving the contradiction between viewing angle and device volume.
Solution Approach 2:
The patent employs a light path converter as an intermediary component between the small display module and the user's eye. This intermediary uses reflective elements to extend the light path and create a virtual image that appears to come from a larger display area, enabling wide viewing angles without increasing the physical display size or device volume.
2Adaptability or versatility
If the size of the display module is increased to increase the viewing angle, then the viewing angle is improved, but the mass of the head mounted display device increases
Solution Approach 1:
The light path converter uses reflective elements to redirect light paths in three-dimensional space, creating a virtual expansion of the display area without adding physical display material. This dimensional approach to light routing achieves wide viewing angles while keeping the display module and overall device mass minimal.
Solution Approach 2:
The light path converter serves as a lightweight intermediary that optically amplifies the display module's effective size. By using reflective elements rather than physically larger displays, the system achieves the viewing angle improvement without the corresponding increase in mass that would result from scaling up the display module.
3Adaptability or versatility
If a light path converter is added to expand the viewing angle, then the viewing angle increases, but the device complexity increases
Solution Approach 1:
The light path converter is designed to handle both the main image from the display module and the sub-image from the edge display module through a single integrated optical path. This multi-functional component simultaneously manages multiple light paths and viewing angle requirements, reducing overall system complexity compared to having separate optical systems for different image sources.
Solution Approach 2:
The patent merges the light paths from the main display module and the edge display module through a unified light path converter. By combining these optical paths and using a single reflective element system to manage both, the design achieves wide viewing angles for multiple image sources without proportionally increasing device complexity.
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 effectively increases the viewing angle for both the main and sub-images, providing a wider field of view while maintaining a compact and lightweight design, enhancing user experience without the need for larger components.
Implementation Method 1
The light path converter may include a reflective type diffraction grating... The light representing the sub-image may be provided to the light path converter along a first direction, and may be reflected from the light path converter to be provided to the lens assembly along a second direction different from the first direction.
Implementation Method 2
The lens assembly may change a path of the light representing the main image and a path of the light representing the sub-image to provide the lights to a position corresponding to a focus of user's eyes.
Data Source
AI summary
A head mounted display device includes a lens assembly which changes a path of light; a main display module which outputs a main image and is positioned in front of the lens assembly; a main optical block which shields at least a portion of a light representing the main image such that the light representing the main image faces the lens assembly; a sub-display module disposed on a side of the main optical block and which outputs a sub-image; a sub-optical block positioned on the side of the main optical block and which shields at least a portion of a light representing the sub-image; and a light path converter positioned in the sub-optical block and which changes a path of the light representing the sub-image such that the light representing the sub-image faces the lens assembly.