Ocular Optical System for VR with Expanded Field of View
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Solution Overview
Problem
Existing ocular optical systems for Virtual Reality (VR) devices have a limited half apparent field of view, leading to narrow vision and imaging quality issues, such as aberrations, which necessitate compensation on the display screen.
Innovation Solution
An ocular optical system comprising a sequence of three lens elements with specific refracting powers and surface shapes, including convex and concave portions, is designed to optimize imaging quality and increase the half apparent field of view while shortening the system length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a half apparent field of view is increased, then the vision width and imaging quality are improved, but the system length and complexity increase
Solution Approach 1:
The optical system is divided into three separate lens elements (first lens element, second lens element, and third lens element) arranged in sequence along the optical axis. Each lens element has specific refracting power and surface characteristics designed to contribute to the overall field of view expansion while maintaining compact system length. The segmentation allows each component to be optimized independently for its specific optical function.
Solution Approach 2:
The second lens element features a convex portion on its display-side surface in the vicinity of the optical axis, while the third lens element has specific refracting power characteristics. These local quality variations in different regions of the lens elements enable precise control over light paths and optical aberrations, achieving large half apparent field of view without proportionally increasing system length.
2Length of moving object
If the system length is shortened, then the device compactness is improved, but the imaging quality and field of view may deteriorate
Solution Approach 1:
The patent specifies precise parameter relationships: T3/G23≤4.3 and G3D/T3≤3.51, where T3 is the thickness of the third lens element, G23 is the air gap between second and third lens elements, and G3D is the distance from the third lens element to the display screen. By controlling these parameters within specific ranges, the system achieves compact length while maintaining favorable imaging quality and large half apparent field of view.
3Manufacturing precision
If aberrations are reduced, then the imaging quality is improved, but the optical design complexity increases
Solution Approach 1:
The optical design intentionally introduces specific aberration characteristics in certain lens elements that can be compensated by the overall system configuration. The convex portion on the second lens element and the specific refracting power of the third lens element work together to convert potential harmful aberrations into beneficial optical performance, achieving favorable imaging quality through controlled aberration management.
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 achieves favorable imaging quality and a large apparent field of view without sacrificing system length, enhancing user experience by reducing aberrations and improving manufacturing ease.
Implementation Method 1
The first lens element has refracting power. The third lens element has refracting power.
Data Source
AI summary
An ocular optical system includes a first lens element, a second lens element, and a third lens element from an eye-side to a display-side in order along an optical axis. The first lens element, the second lens element, and the third lens element each include an eye-side surface and a display-side surface. The first lens element has refracting power. The display-side surface of the second lens element has a convex portion in a vicinity of the optical axis. The third lens element has refracting power. The ocular optical system satisfies: T3/G23≤4.3; and G3D/T3≤3.51, where T3 is a thickness of the third lens element along the optical axis, G23 is an air gap from the second lens element to the third lens element along the optical axis, and G3D is a distance from the third lens element to the display screen along the optical axis.