Blur Compensation System for Diffractive Optical Elements
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Solution Overview
Problem
The existing image presentation systems using half mirrors have limited design flexibility due to regular reflection characteristics, leading to blur issues when optical elements with different incidence and emission angles are used, such as diffractive or holographic optical elements.
Innovation Solution
A blur compensation system comprising first and second optical elements with different incidence and emission angles, and a third optical element that adjusts the light path to align peripheral wavelengths with the specific wavelength, compensating for blur generated by the first and second optical elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a diffractive optical element (DOE) or holographic optical element (HOE) is used to achieve different incidence and emission angles, then design flexibility is improved, but blur is generated in the presented image due to wavelength-dependent diffraction
Solution Approach 1:
A wavelength conversion element (such as a fluorescent plate or wavelength conversion film) is introduced as an intermediary between the light source and the diffractive/holographic optical element. This element converts broad-spectrum light into monochromatic or narrow-band light at a specific wavelength, enabling the DOE/HOE to operate at its designed wavelength without chromatic dispersion, thus eliminating blur while preserving design flexibility
Solution Approach 2:
The patent changes the wavelength parameter of the incident light by using a wavelength conversion element that transforms broad-spectrum light into monochromatic light. This parameter change allows the diffractive or holographic optical element to function without the wavelength-dependent angle variations that cause blur, while maintaining the ability to achieve different incidence and emission angles
2Manufacturing precision
If a half mirror with regular reflection characteristics is used, then image clarity is maintained, but design flexibility is limited due to fixed incidence and reflection angle relationships
Solution Approach 1:
The patent replaces the conventional half mirror (which relies on geometric reflection) with a diffractive or holographic optical element that uses diffraction or holographic interference patterns. This substitution enables different incidence and emission angles while maintaining image clarity through the use of monochromatic light from the wavelength conversion element
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 system effectively curbs blur caused by optical elements with different incidence and emission angles, enhancing design flexibility and image clarity by aligning peripheral wavelengths with the specific wavelength, thereby improving the presentation of images.
Implementation Method 1
an optical element in which an incidence angle and an emission angle are different from each other when light of a specific wavelength is incident thereon, light of a peripheral wavelength of the specific wavelength is emitted at an emission angle which deviates from the emission angle of the light of the specific wavelength. When this optical element is used instead of the half mirror, blur is generated in an image which is presented to a user because of a change of an optical path due to diffraction.
Implementation Method 2
a third optical element that is disposed on an optical axis of the light of an image between the first optical element and the second optical element and changes a direction of the light of an image which is reflected or transmitted by the first optical element such that light of a wavelength other than the specific wavelength out of the light of an image which is reflected or transmitted by the first optical element is emitted in the same direction as the light of the specific wavelength
Data Source
AI summary
A blur compensation system includes: a mirror on which light of an image from a predetermined position is incident and which reflects light of a specific wavelength such that an incidence angle and an emission angle of the light of the specific wavelength are different from each other; a mirror that is disposed at a position on which the light of an image which is reflected by the mirror is incident and reflects the light of the specific wavelength such that an incidence angle and an emission angle of the light of the specific wavelength are different from each other; and a lens that is disposed on an optical axis of the light of an image between the mirror and the mirror and changes a direction of the light of an image which is reflected by the mirror such that light of a wavelength other than the specific wavelength out of the light of an image which is reflected by the mirror is emitted in the same direction as the light of the specific wavelength from an emission position of the light of the specific wavelength in the mirror.