Field Bias Optical Element for Digital Projector Aberration Control
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Solution Overview
Problem
Conventional head-mounted devices experience optical aberrations when trying to increase the field-of-view due to the design of lenses, which can distort virtual graphics presented to the user.
Innovation Solution
Incorporating a field bias optical element within the digital projector's optical assembly, which allows lenses to be designed for a smaller field-of-view with reduced aberrations, while still providing an effectively larger field-of-view through the use of a prism, transparent material with graduated refractive index, or diffractive optical elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If lenses are designed for a larger field-of-view, then the field-of-view is increased, but optical aberrations increase causing distortion of virtual graphics
Solution Approach 1:
The optical system is divided into two functional segments: a lens assembly designed for a first (smaller) field-of-view optimized for minimal aberrations, and a field bias optical element that provides the additional angular deviation to achieve an effectively larger second field-of-view. This segmentation allows each component to be optimized for its specific function without compromising the other.
Solution Approach 2:
A field bias optical element is introduced as an intermediary component between the lens assembly and the user's eye. This intermediary element provides the necessary angular deviation to expand the field-of-view while allowing the primary lens assembly to maintain its optimized design for minimal aberrations at a smaller field-of-view.
2Object-affected harmful factors
If lenses are designed for a smaller field-of-view, then optical aberrations are reduced, but the field-of-view is limited
Solution Approach 1:
The optical system is divided into two functional segments: a lens assembly designed for a first (smaller) field-of-view optimized for minimal aberrations, and a field bias optical element that provides the additional angular deviation to achieve an effectively larger second field-of-view. This segmentation allows each component to be optimized for its specific function without compromising the other.
Solution Approach 2:
The field bias optical element introduces an additional dimensional aspect to the optical system by providing angular deviation in a direction that expands the effective field-of-view beyond what the lens assembly alone could provide, effectively adding a dimensional component to the field-of-view expansion.
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 approach reduces optical aberrations while maintaining an increased field-of-view, enhancing user experience by minimizing distortion in virtual graphics displayed to the user.
Implementation Method 1
the field bias optical element may be provided by way of a prism, a transparent material with graduated refractive index, a diffractive optical element, or some combination thereof
Implementation Method 2
the field bias optical element may be provided by way of a prism, a transparent material with graduated refractive index, a diffractive optical element, or some combination thereof
Data Source
AI summary
An optical assembly for a digital projector includes a lens and a field bias optical element. The lens is disposed to receive display light generated by a display and to direct the display light along an optical path. The lens is configured to provide a first field-of-view. The field bias optical element is disposed between the lens and an aperture stop of the optical assembly. The field bias optical element is configured to bias the display light in at least one direction to provide a second field-of-view that is greater than the first field-of-view.