Cemented Doublet Lens for HMD Color Correction
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Solution Overview
Problem
Conventional optics for head-mounted displays (HMDs) face challenges in delivering high-quality, color-corrected images for augmented reality applications, particularly in maintaining the integrity of computer-generated imagery (CGI) while providing an unobstructed view of the real world.
Innovation Solution
The eyepiece design incorporates a doublet lens system with a polarized beam splitter and optically matched refractive materials, reducing parts count and Fresnel losses, and allowing for zero axial color shift, enabling effective color correction and clear external scene representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optics are used for HMDs, then the structure is simpler, but color correction quality and image integrity deteriorate
Solution Approach 1:
The patent combines multiple optical functions into a single integrated doublet lens assembly. The first and second lenses are cemented together to form a compact unit that simultaneously provides magnification, color correction, and focal length adjustment, eliminating the need for separate optical components and reducing overall system complexity while maintaining high manufacturing precision
Solution Approach 2:
The doublet lens employs composite optical design with two different lens materials having distinct refractive indices and Abbe numbers. This composite structure enables chromatic aberration correction by compensating for wavelength-dependent refraction differences, achieving superior color correction quality that cannot be obtained with single-material lenses
2Manufacturing precision
If multiple optical components are used, then color correction is improved, but Fresnel losses and manufacturing costs increase
Solution Approach 1:
By cementing the first and second lenses together into a single doublet assembly, the patent eliminates air-glass interfaces between separate components. This merging reduces the number of surfaces where Fresnel reflections occur, minimizing light loss while maintaining the chromatic correction benefits of using two different lens materials
Solution Approach 2:
The patent introduces an optical cement as an intermediary material between the two lens elements. This cemented joint provides optimal optical coupling with matched refractive indices, minimizing reflection losses at the interface while enabling the composite lens structure to achieve superior color correction through the combined optical properties of both lens materials
3Reliability
If more optical parts are included, then image quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple optical functions into a single doublet lens assembly that simultaneously provides magnification, chromatic aberration correction, and focal length control. This integrated design maintains high image quality and reliability while reducing the total parts count and simplifying the optical system architecture
Solution Approach 2:
The doublet lens assembly serves multiple optical functions within a single component structure. It provides both converging and diverging optical power, corrects chromatic aberrations across the visible spectrum, and maintains a compact form factor, demonstrating multi-functionality that reduces overall device complexity while enhancing image quality
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 design enhances the quality of both computer-generated and real-world imagery, providing a more representative and unobstructed view for the user by reducing optical aberrations and maintaining the integrity of the image, while minimizing costs through reduced parts count.
Implementation Method 1
an optically coupled polarized beam splitter
Implementation Method 2
a first optically coupled lens and a second optically coupled lens. The first lens and the second lens provide a net zero axial color shift
Data Source
AI summary
An eyepiece for a head mounted display (“HMD”) includes a doublet lens that includes a first optical element and a second optical element. The first optical element has an entry surface to receive the display light from a micro display and a first coupling surface. The second optical element has an exit surface and a second coupling surface paired to the first coupling surface of the first optical element. The doublet lens is configured to direct the display light through the first coupling surface, the second coupling surface, and through the exit surface.