Head-Mounted Display Optical Module for Chromatic Aberration Reduction
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Solution Overview
Problem
Chromatic aberration generated by multiple lenses in head-mounted displays reduces imaging quality, necessitating a solution to improve imaging definition and achieve high-definition imaging.
Innovation Solution
An optical module with specific refractive index and dispersion coefficient combinations for lenses, along with a beam-splitter and quarter-wave plates, to reduce chromatic aberration and enhance imaging definition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple lenses are used in the optical system, then the optical system can achieve imaging function, but chromatic aberration is generated which reduces imaging quality
Solution Approach 1:
The patent applies parameter changes by carefully selecting and matching the refractive indices and dispersion coefficients of multiple lenses. Specifically, the first lens has refractive index n1 and dispersion coefficient v1, the second lens has n2 and v2, the third lens has n3 and v3, where n1<n3 and n2<n3, and v1>v2>v3. By adjusting these optical parameters within specific ranges, the patent compensates for chromatic aberration generated by each lens, achieving high-definition imaging with reduced color fringing.
2Volume of moving object
If the size of the display in the optical system becomes smaller, then the volume of the head-mounted display is reduced, but imaging quality deteriorates due to chromatic aberration from multiple lenses
Solution Approach 1:
The patent employs a nested arrangement where the optical components are compactly integrated. The first lens, second lens, and third lens are arranged in sequence with the beam splitter positioned on the first lens, creating a nested configuration that minimizes the overall optical path length and device volume while maintaining effective chromatic aberration correction through the coordinated lens parameters.
3Reliability
If lenses with different refractive indexes and dispersion coefficients are used, then chromatic aberration is reduced, but the device complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific optical properties to each lens position. The first lens (with higher dispersion coefficient v1) and second lens (with intermediate dispersion coefficient v2) are positioned to handle specific wavelength ranges, while the third lens (with lowest dispersion coefficient v3) provides final correction. Each lens has optimized refractive index and dispersion coefficient values tailored to its position in the optical path, achieving effective chromatic aberration correction through localized optimization rather than uniform design.
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 solution effectively reduces chromatic aberration, enabling high-definition imaging with a compact optical system by folding the light path through multiple reflections.
Implementation Method 1
a first quarter-wave plate is arranged at any position between the third lens and the first lens
Implementation Method 2
a side of the first lens distal to the second lens is provided with a beam-splitter
Implementation Method 3
each of the first lens and the second lens has a refractive index less than that of the third lens
Data Source
AI summary
The present disclosure provides an optical module and a head-mounted display. The optical module includes a third lens, a polarization reflecting film, a second lens, and a first lens arranged sequentially; a first quarter-wave plate is arranged between the third lens and the first lens; a beam-splitter provided a side of the first lens distal to the second lens; each of the first lens and the second lens has a refractive index less than that of the third lens; the first lens has a dispersion coefficient greater than that of the second lens, and the second lens has a dispersion coefficient greater than that of the third lens.