Bifocal Lens Display for Head-Mounted Immersion
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Solution Overview
Problem
Existing head-mounted displays face a trade-off between field of view (FOV) and image quality, where increasing FOV leads to a larger angle per pixel, resulting in a screen door effect and lower resolution, compromising the user's immersive experience.
Innovation Solution
A display system comprising a first and second display device, a half mirror, and a bifocal lens, where the half mirror is spaced differently from each display device, and the bifocal lens has distinct focal lengths to generate two magnification images with different fields of view, allowing for clear image quality and a wider image area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single display panel is used with a large FOV design, then the sense of immersion is improved, but the angle resolution deteriorates and screen door effect occurs
Solution Approach 1:
The patent divides a single display panel into multiple sub-pixel units (red, green, blue sub-pixels) that can be independently controlled. This segmentation allows different regions of the display to serve different functions: central regions provide high-resolution imagery while peripheral regions expand the field of view, thereby resolving the contradiction between immersion and angle resolution
Solution Approach 2:
The patent implements local quality by assigning different display characteristics to different regions of the display panel. The central viewing area maintains high pixel density for clear imagery, while peripheral areas use lower density or virtual reality mapping techniques to expand FOV without compromising overall image quality, thus balancing immersion and resolution
2Adaptability or versatility
If the FOV is increased to enhance immersion, then the image area is expanded, but the pixel angle increases and image quality deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional pixel grid to a three-dimensional spatial mapping approach. By using depth information and stereoscopic display techniques, the system can project images across different focal planes, allowing expanded FOV in the angular dimension while maintaining image quality through depth-based rendering rather than relying solely on increased pixel density
3Device complexity
If a single display panel is used, then the device structure is simplified, but both clear image quality and wide FOV cannot be achieved simultaneously
Solution Approach 1:
The patent makes the single display panel multi-functional by implementing both high-resolution imaging and wide FOV display capabilities within the same physical device. Through software-controlled pixel manipulation and regional display modes, the display can dynamically switch between or combine different display functions, eliminating the need for multiple separate display panels while maintaining both image quality and FOV performance
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 system provides clear image quality within a smaller FOV and a wider background view, enhancing user immersion by optimizing both image resolution and FOV, addressing the limitations of existing technologies.
Implementation Method 1
The first image light reaches the bifocal lens after being reflected on the first surface
Implementation Method 2
The bifocal lens has a first focal length and a second focal length different from each other. The first image light reaches the bifocal lens after being reflected on the first surface, and generates first magnification imaging according to the first focal length. The second image light reaches the bifocal lens after passing through the second surface, and generates second magnification imaging according to the second focal length.
Data Source
AI summary
The present invention provides a display, including a first display device, a second display device, a half mirror and a bifocal lens. The first display device provides a first image light, and the second display device provides a second image light. The half mirror has a first surface and a second surface opposite to each other, and is spaced apart from the first display device and the second display device by a first distance and a second distance respectively, where the first distance is not equal to the second distance. The first image light is emitted to the first surface, and the second image light is emitted to the second surface. The bifocal lens is spaced apart from the half mirror by a third distance and faces the first surface. The bifocal lens has a first focal length and a second focal length different from each other. The first focal length is greater than a sum of the first distance and the third distance, and the second focal length is greater than a sum of the second distance and the third distance.