Display Device With Differing Diffraction Angles And Correction Optics
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Solution Overview
Problem
Display devices using two diffraction elements for wavelength compensation face challenges in maintaining image quality due to the need for identical diffraction angles, which increases device size, and insufficient wavelength compensation when angles differ, leading to reduced image resolution and color aberration.
Innovation Solution
Incorporating a correction optical system along the optical path with a first optical unit, a second optical unit including a first diffraction element, a third optical unit, and a fourth optical unit, where the diffraction angles of the first and second diffraction elements differ, and the correction optical system adjusts the incident angle or position of the image light to compensate for wavelength deviations, potentially using a prism for effective correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the two diffraction elements have an optical conjugated relationship with the same diffraction angles, then wavelength compensation is optimized, but the device size increases
Solution Approach 1:
The patent changes the diffraction angle parameter from being identical to being different between the two diffraction elements. Specifically, the first diffraction element has a first diffraction angle and the second diffraction element has a second diffraction angle that is different from the first, allowing size reduction while maintaining compensation functionality through the correction optical system
Solution Approach 2:
The correction optical system acts as an intermediary between the two diffraction elements with different diffraction angles. It corrects the incident angle of image light before it reaches the second diffraction element, enabling wavelength compensation to function effectively even though the diffraction angles are different, thus mediating the conflict between size reduction and compensation performance
2Volume of moving object
If the diffraction angles of the two diffraction elements are set to be different to reduce device size, then device size is reduced, but wavelength compensation becomes insufficient leading to decreased image quality
Solution Approach 1:
The correction optical system serves as a mediator that restores wavelength compensation functionality despite the different diffraction angles. It adjusts the incident angle of light on the second diffraction element to compensate for the angular mismatch, ensuring that image quality is maintained while allowing the device to be more compact
Solution Approach 2:
The patent intentionally changes the diffraction angle parameters to be different between the two elements for size reduction, then uses the correction optical system to adjust the incident angle parameter dynamically, maintaining the effective compensation function despite the fundamental parameter difference
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 allows for reduced device size while maintaining high image quality by ensuring parallel light emission from the second diffraction element, effectively canceling color aberration and improving resolution by compensating for peripheral wavelengths.
Implementation Method 1
a first diffraction element and has positive power... a first diffraction angle of the image light at the first diffraction element
Implementation Method 2
a second diffraction element and has positive power... a second diffraction angle of the image light at the second diffraction element
Implementation Method 3
a correction optical system that corrects an incident angle of the image light with respect to the second diffraction element... the correction optical system may deflect the image light dispersed by the first diffraction element
Data Source
AI summary
A display device of the present disclosure includes, along an optical path of image light emitted from an image light generating device, a first optical unit having positive power, a second optical unit that includes a first diffraction element and has positive power, a third optical unit having positive power, and a fourth optical unit that includes a second diffraction element and has positive power. A first diffraction angle of the image light at the first diffraction element is different from a second diffraction angle of the image light at the second diffraction element. A correction optical system that corrects an incident angle of the image light with respect to the second diffraction element is provided between the first optical unit and the fourth optical unit on the optical path.