Movable Display Lens Assembly for Viewing-Angle Adaptation
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Solution Overview
Problem
Existing wearable electronic devices, such as head-mounted displays, face challenges in providing a comfortable fit, reducing user fatigue, and delivering high-quality images due to limitations in display and optical system specifications, especially when considering individual facial shapes and viewing angles.
Innovation Solution
A display device with a lens assembly comprising at least three lenses arranged sequentially along an optical axis, configured to reflect the screen output twice, and a movable display that satisfies specific dimensional ratios, enhancing optical performance and field of view to match user viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional display and optical system is used in wearable electronic devices, then the device can be manufactured with standard specifications, but the image quality and field of view are insufficient to match individual user viewing angles and facial shapes
Solution Approach 1:
The display is configured to be movable relative to the lens assembly, allowing dynamic adjustment of the display's position and orientation. This enables the system to adapt to different user viewing angles and facial shapes, transforming a static optical system into a dynamically adjustable one that can optimize image quality for each user.
Solution Approach 2:
The patent changes key parameters including the diagonal length of the display, the distance from the optical axis to the display center, and the viewing angle range. By adjusting these parameters within specific ranges, the system achieves optimal optical performance alignment while maintaining adaptability to individual users without requiring custom manufacturing for each user.
2Adaptability or versatility
If the display size is increased to improve field of view, then the viewing angle coverage improves, but the device size and weight increase
Solution Approach 1:
Instead of simply increasing display area in a single plane, the patent utilizes three-dimensional positioning by allowing the display to move in directions crossing both the screen output direction and the optical axis. This enables a smaller display to achieve an effectively larger field of view through optimal angular positioning, avoiding the need for a physically larger display.
Solution Approach 2:
The patent optimizes the diagonal length of the display and its positioning parameters (distance from optical axis, viewing angle) to achieve maximum field of view coverage with minimal display area. By changing these parameters within calculated ranges, the system achieves high adaptability without proportionally increasing device weight.
3Volume of moving object
If the display is positioned closer to the lens assembly to reduce device size, then the device becomes more compact, but the alignment precision and optical performance deteriorate
Solution Approach 1:
The movable display configuration allows the system to dynamically find the optimal position that balances compactness with alignment precision. Rather than being fixed, the display can be adjusted to achieve precise optical alignment even when positioned close to the lens assembly, maintaining manufacturing precision while minimizing device volume.
Solution Approach 2:
The patent calculates specific ranges for the diagonal length of the display and its positioning parameters (distance from optical axis, viewing angle) that enable optimal optical performance even at reduced distances. By adjusting these parameters within the calculated ranges, the system achieves compact device volume without sacrificing alignment precision.
4Device complexity
If a fixed display position is used to simplify the structure, then the device structure becomes simpler and easier to manufacture, but the adaptability to different user viewing angles is reduced
Solution Approach 1:
The patent introduces controlled movability to the display, allowing it to adjust its position within specific ranges while maintaining a relatively simple overall structure. This dynamic capability enables adaptation to different user viewing angles and facial shapes without requiring complex mechanisms, achieving versatility with moderate structural complexity.
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 provides a comfortable fit and high-quality images by aligning the display device's optical performance with user viewing angles, reducing fatigue and improving image quality.
Implementation Method 1
the lens assembly may be configured to reflect the screen output from the display at least twice between a first lens disposed farthest from the display among the at least three lenses and an nth lens disposed closest to the display among the at least three lenses
Data Source
AI summary
A display device includes a display configured to output a screen image along a first direction, and a lens assembly including at least three lenses arranged sequentially along an optical axis and configured to focus or guide the screen output from the display in a predetermined direction/predetermined position. The lens assembly may be configured to reflect the screen output from the display at least twice between a first lens disposed farthest from the display and an nth lens disposed closest to the display. The display may be disposed to be movable in a direction crossing the first direction or the optical axis. The display device satisfies [Conditional expression 1: 0.02<=MD/DSP<=0.2] regarding the diagonal length DSP of the display and the distance MD from the optical axis to the center of the display which is measured along a direction perpendicular to the optical axis.