Movable Image Source Near-Eye Display Exit Pupil Alignment
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Solution Overview
Problem
Near eye display devices face challenges in aligning exit pupils with users' eyes, as the distance between pupils varies among individuals, leading to inefficiencies in light distribution and user experience.
Innovation Solution
The apparatus includes an image source and a plurality of grating areas that direct light beams to an exit pupil, allowing the image source to be moved relative to the grating areas to adjust the position of the exit pupil, ensuring proper alignment with the user's eyes, regardless of inter-pupil distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the exit pupil position is fixed in the device, then the device structure is simple, but the device cannot accommodate users with different inter-pupil distances
Solution Approach 1:
The patent implements a moveable image source that can be repositioned along an optical axis relative to the diffraction grating. This dynamic adjustment mechanism allows the exit pupil position to be changed to accommodate different users' inter-pupil distances, resolving the contradiction between adaptability and structural simplicity by introducing controlled mobility rather than complete redesign
Solution Approach 2:
The patent divides the grating structure into multiple grating areas (first grating area, second grating area, third grating area) with different orientations. This segmentation allows independent optimization of light distribution in different directions and enables the system to handle varying user configurations without requiring complete structural changes
2Ease of operation
If the image source is moved to adjust exit pupil position, then user alignment is improved, but the device requires additional moving mechanisms
Solution Approach 1:
The patent enables the image source to be moved manually or automatically to positions where it aligns with different portions of the grating structure. This self-adjustment capability allows users to align the device with their eyes without requiring complex external adjustment mechanisms, as the system can be configured to work with standard user positions
3Productivity
If the grating areas are configured to direct light to specific exit pupil positions, then light distribution efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies different grating orientations to different spatial regions: the first grating area has a first orientation, the second grating area has a second orientation, and the third grating area has a third orientation. This local differentiation optimizes light distribution for specific directions and user positions while maintaining manufacturability by using standard grating fabrication techniques for each region
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 solution enables efficient light distribution by aligning the exit pupils with the user's eyes, reducing light wastage and enhancing the usability of near eye display devices for users with different inter-pupil distances, thereby improving the overall user experience.
Implementation Method 1
a plurality of grating areas between the image source and the exit pupil wherein the plurality of grating areas are configured to direct beams of light from the image source to the exit pupil
Data Source
Figure 1
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Figure 3A~3D
AI summary
An apparatus and method wherein the apparatus comprises: an image source;an exit pupil configured to be positioned proximate to an eye of a user to enable a user to view an image from the image source; and a plurality of grating areas between the image source and the exit pupil wherein the plurality of grating areas are configured to direct beams of light from the image source to the exit pupil;wherein the image source is configured to be moved relative to the plurality of grating areas to control the position of the exit pupil relative to the eye of the user.