Wearable Display Microlens Layout for Wide FOV and Low Color Fringing
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Solution Overview
Problem
Wearable electronic devices face challenges in providing a wide field of view and minimizing color fringing due to misalignment between the display center and lens center, leading to suboptimal visual experience.
Innovation Solution
The design includes a display panel with continuously disposed pixels and an optical assembly featuring micro-lenses that adjust light paths to compensate for angle differences between chief ray angles and compensation angles, ensuring the lens center is offset from the display center by a designated interval, thereby controlling error amounts within a specific angle range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the lens center is offset from the display center by a designated interval, then the field of view is enhanced, but color fringing occurs due to misalignment between display and lens
Solution Approach 1:
The patent applies local quality by implementing different optical characteristics at different locations. Specifically, micro-lenses are positioned and sized differently at various locations on the display panel to locally compensate for the chief ray angle deviations. This allows the system to maintain a wide field of view while controlling color fringing at specific regions through localized optical optimization.
Solution Approach 2:
The patent changes optical parameters by adjusting the positions, sizes, and shapes of micro-lenses to optimize the relationship between chief ray angles and compensation angles. By varying these geometric parameters across the display panel, the system achieves both enhanced field of view and reduced color fringing through precise optical parameter optimization.
2Manufacturing precision
If micro-lenses are used to change light paths by compensation angles, then the alignment error between display and lens is reduced, but the optical assembly complexity increases
Solution Approach 1:
The patent segments the optical correction function into multiple micro-lenses distributed across the display panel. Each micro-lens handles a specific local region's light path correction, dividing the complex alignment error correction into smaller, manageable units. This segmentation reduces the overall complexity compared to a single large lens system while maintaining high alignment precision.
Solution Approach 2:
The micro-lenses serve as intermediary elements between the display panel and the main lens. They mediate the optical path by introducing compensation angles that offset the chief ray angle deviations, thereby reducing alignment errors without requiring the main lens to be perfectly aligned with the display center.
3Use of energy by moving object
If the chief ray angles are optimized for each pixel position, then the light transmission efficiency is improved, but the optical design complexity increases
Solution Approach 1:
The patent implements local quality by optimizing optical parameters for each pixel position. Each pixel region has its corresponding micro-lens configured with specific position, size, and shape to optimize light transmission for that local area. This localized optimization maximizes overall light transmission efficiency while managing design complexity through systematic local parameter adjustment.
Solution Approach 2:
The patent introduces dynamic optimization by allowing the micro-lens parameters (position, size, shape) to vary continuously across the display panel rather than using uniform fixed parameters. This dynamic configuration enables the system to adapt the optical characteristics to match the specific requirements of each pixel position, improving light transmission efficiency.
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 enhances the field of view and reduces color fringing, providing a more immersive and clear visual experience for the user.
Implementation Method 1
The first optical assembly may include first micro-lenses configured to change paths of light output from the first pixels by compensation angles
Implementation Method 2
a first lens configured to transmit light output from the first display to eyes of a user
Data Source
AI summary
A wearable electronic device includes: a first display including a first display panel and a first optical assembly on one surface of the first display panel; and a first lens configured to transmit light output from the first display to the eyes of a user. The center of the first lens may be spaced apart from the center of the first display by a specified distance in a first direction. The first display panel includes first pixels continuously arranged on the same plane, and chief ray angles with respect to the optical axis of the first lens may be changed to correspond to the first pixels. The first optical assembly may include first microlenses configured to change paths of light output from the first pixels by a compensation angle and transmit the light to the first lens.