Display Optics Layout for Resin-Based Chromatic Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display optical systems for head-mounted displays face challenges in reducing chromatic aberration, field curvature, and astigmatic difference while maintaining a lightweight design, particularly when using resin materials with limited refractive index and Abbe number variations.
Innovation Solution
The display optical system employs a configuration with a transmissive reflective optical system comprising lenses with positive and negative on-axis powers, cemented via a quarter waveplate, and includes curved surfaces that interface with air in the pupil-plane-side and panel-side optical systems, utilizing resin materials to reduce chromatic aberration and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If resin materials are used in display optical systems, then weight is reduced, but chromatic aberration control becomes difficult due to limited refractive index and Abbe number variations
Solution Approach 1:
The patent combines multiple resin materials with different refractive indices and Abbe numbers in a composite optical system. Specifically, it uses a positive lens made of one resin material and a negative lens made of another resin material, creating a composite system that achieves chromatic aberration correction while maintaining the weight benefits of resin materials throughout the optical path.
2Manufacturing precision
If cemented lenses are used to reduce chromatic aberration, then optical performance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the chromatic aberration correction function from the traditional cemented lens structure and implements it through a contact structure between separate positive and negative lenses. This separation allows each lens to be optimized independently while maintaining effective chromatic aberration correction, reducing the complexity associated with cemented lens manufacturing.
3Manufacturing precision
If multiple lens elements with different materials are combined, then chromatic aberration is reduced, but manufacturing precision and assembly difficulty increase
Solution Approach 1:
The patent merges the positive and negative lenses into a contact structure where they directly touch each other without air gaps or complex mounting mechanisms. This merging simplifies the assembly process while maintaining the chromatic aberration correction benefits of using different resin materials with specific refractive index and Abbe number combinations.
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 configuration effectively reduces chromatic aberration, field curvature, and astigmatic difference, while allowing for freedom in material selection and enabling weight reduction, with improved imaging performance and diopter adjustment capabilities.
Implementation Method 1
The second lens unit includes a lens having positive on-axis refractive power and a lens having negative on-axis refractive power and an Abbe number based on d-line different from that of the lens having the positive on-axis refractive power
Implementation Method 2
a first transmissive reflective surface, a second lens unit, a second transmissive reflective surface
Data Source
AI summary
A display optical system is configured to guide light from a display surface of a display element to a pupil plane, and includes, in order from a pupil plane side to a display surface side, a first lens unit, a first transmissive reflective surface, a second lens unit, a second transmissive reflective surface, and a third lens unit. The second lens unit includes lenses having positive and negative on-axis refractive powers and different Abbe numbers based on d-line. At least one of the first lens unit and the third lens unit has a curved surface that serves as an interface with air. The Abbe number based on the d-line of the lens having the positive on-axis refractive power is larger than the Abbe number based on the d-line of the lens having the negative on-axis refractive power.