Display Module Light-Guiding Member Color Aberration Compensation
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Solution Overview
Problem
Head-mounted display apparatuses face challenges with color aberrations due to wavelength dispersion when using volume holograms, leading to increased size and weight of the light-guiding member, which compromises wearability and designability, and existing configurations struggle to appropriately arrange optical elements.
Innovation Solution
A display module design that includes an image light generation device, a light-guiding member with specific reflection and diffraction surfaces, and diffraction elements to efficiently guide and deflect image light, forming an exit pupil while minimizing the light-guiding member's size and weight, and optimizing the placement of optical elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two volume hologram elements are provided on incident side and exit side to compensate for color aberrations, then color aberration compensation is improved, but the size and weight of the light-guiding member increases
Solution Approach 1:
The patent extracts the color aberration compensation function from the traditional dual volume hologram configuration and implements it using a single light-guiding member with specifically designed internal reflection surfaces. This eliminates the need for separate hologram elements while maintaining compensation effectiveness, thereby reducing overall size and weight.
Solution Approach 2:
The patent combines multiple functions (light guiding, color aberration compensation, and reflection) into a single integrated light-guiding member. By merging these functions, the design eliminates the need for separate hologram elements and reduces the number of components, achieving both compactness and effective aberration correction.
2Measurement precision
If two volume hologram elements are provided on incident side and exit side to compensate for color aberrations, then color aberration compensation is improved, but the size of the light-guiding member increases
Solution Approach 1:
The patent extracts the color aberration compensation function from the traditional dual volume hologram configuration and implements it using a single light-guiding member with specifically designed internal reflection surfaces. This eliminates the need for separate hologram elements while maintaining compensation effectiveness, thereby reducing overall size and weight.
Solution Approach 2:
The patent combines multiple functions (light guiding, color aberration compensation, and reflection) into a single integrated light-guiding member. By merging these functions, the design eliminates the need for separate hologram elements and reduces the number of components, achieving both compactness and effective aberration correction.
3Measurement precision
If the screen size of head-mounted display apparatus is increased, then display quality is improved, but the thickness and length of the light-guiding member increase causing increased weight
Solution Approach 1:
The patent employs multiple internal reflection surfaces arranged in a folded optical path configuration within the light-guiding member. This allows the optical path to be extended in a folded manner rather than a straight line, enabling larger effective screen size while maintaining compact physical dimensions and reducing overall weight.
4Measurement precision
If the screen size of head-mounted display apparatus is increased, then display quality is improved, but the thickness and length of the light-guiding member increase
Solution Approach 1:
The patent employs multiple internal reflection surfaces arranged in a folded optical path configuration within the light-guiding member. This allows the optical path to be extended in a folded manner rather than a straight line, enabling larger effective screen size while maintaining compact physical dimensions and reducing overall weight.
5Length of stationary object
If image light is reflected five times inside the light-guiding member, then optical path folding is improved, but it becomes difficult to appropriately arrange optical elements
Solution Approach 1:
The patent provides different numbers of reflection surfaces at different locations within the light-guiding member. Specifically, the incident side has a different configuration than the exit side, with the first light-guiding member having four reflection surfaces and the second light-guiding member having three reflection surfaces. This localized optimization allows appropriate arrangement of optical elements while achieving sufficient optical path folding.
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 compensates for color aberrations, reduces the size and weight of the light-guiding member, enhances wearability, and improves the designability and display quality of head-mounted display apparatuses by folding optical paths and using diffraction elements to direct image light efficiently.
Implementation Method 1
a first diffraction element including a first incident surface and configured to diffract and deflect the image light that is emitted from the image light generation device, passes through the light-guiding member, and enters through the first incident surface
Implementation Method 2
a second diffraction element including a second incident surface and configured to diffract and deflect the image light that is emitted from the first diffraction element, passes through the light-guiding member, and enters through the second incident surface
Implementation Method 3
a first reflection surface configured to reflect the image light that is emitted from the image light generation device, passes through the light-guiding member, and is incident
Data Source
AI summary
A display module includes an image light generation device, a light-guiding member, a first reflection surface configured to reflect the imaging light incident via the light-guiding member, a first diffraction element configured to diffract the imaging light, and a second diffraction element configured to diffract the image light and form an exit pupil. The image light is sequentially incident on a first deflection surface, a second deflection surface, a second reflection surface, a third reflection surface, a fourth reflection surface, and a third deflection surface inside the light-guiding member, and a distance from a reference position where an optical axis of the exit pupil and an emission surface intersect to the second deflection surface is longer than a distance from the reference position to the first deflection surface and longer than a distance from the reference position to the second reflection surface.