Segmented Light Guide Structure for Uniform Wide-Angle Virtual Images
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Solution Overview
Problem
Existing virtual-image display devices face issues with dropout errors of brightness and uneven brightness due to light beams not hitting mirrors or micro parts at varying angles, leading to reduced image quality and increased production complexity when trying to achieve a wide viewing angle.
Innovation Solution
A light guide comprising two or more light guiding members with an optical-path separator between reflection planes, allowing for controlled light distribution and easy production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple mirrors or micro parts are used to guide light at varying angles, then the viewing angle is widened, but dropout errors of brightness occur because some light beams do not hit the mirrors or micro parts
Solution Approach 1:
The light guide is divided into multiple light guiding members (first light guiding member and second light guiding member) that are bonded together. This segmentation allows different light beams to be guided through different members, ensuring all light beams hit the extraction units properly and eliminating dropout errors while maintaining a manageable structure.
Solution Approach 2:
An optical-path separator is introduced as an intermediary element between the light guiding members and the extraction units. This separator controls and directs light beams, ensuring they are properly distributed to hit the mirrors or micro parts at appropriate angles, thereby preventing brightness dropout errors.
2Stability of the object's composition
If a layer that splits light is disposed inside the light guide to prevent dropout errors, then brightness uniformity is improved, but production complexity increases due to the need for multiple light guiding members and bonding processes
Solution Approach 1:
The light guide is divided into multiple light guiding members (first light guiding member and second light guiding member) that are bonded together. This segmentation allows different light beams to be guided through different members, ensuring all light beams hit the extraction units properly and eliminating dropout errors while maintaining a manageable structure.
Solution Approach 2:
An optical-path separator is introduced as an intermediary element between the light guiding members and the extraction units. This separator controls and directs light beams, ensuring they are properly distributed to hit the mirrors or micro parts at appropriate angles, thereby preventing brightness dropout errors.
3Stability of the object's composition
If the viewing angle is widened to achieve immersive feeling, then the display quality is improved, but the size and thickness of the main body increase
Solution Approach 1:
Multiple light guiding members are nested or bonded together in a compact arrangement, with the optical-path separator integrated between them. This nested structure allows the system to guide light at multiple angles simultaneously while maintaining a thin overall profile, achieving wide viewing angle without increasing thickness.
Solution Approach 2:
The light guiding members are arranged in a planar configuration with the optical-path separator creating vertical separation between light paths. This dimensional arrangement allows multiple light beams to be guided in different directions without increasing the horizontal footprint or thickness, achieving wide viewing angle through smart spatial utilization.
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
Reduces dropout errors and uneven brightness, ensuring high-quality virtual images with a wide viewing angle while simplifying manufacturing processes.
Implementation Method 1
a light guiding unit to guide the light incident on the optical entrance with repeated reflection
Implementation Method 2
The light that is taken into the inside of the light guiding unit is guided within the light guiding unit from an optical entrance side toward a light beam ejection unit with alternate total internal reflection between the first reflection plane and the second reflection plane
Implementation Method 3
an extraction unit to reflect the light guided by the light guiding unit toward the light beam ejection unit
Data Source
AI summary
A light guide includes light guiding members including first and second light guiding members, an optical entrance having a plane on which the light is incident, a light guiding unit to guide the light incident on the optical entrance with repeated reflection, a light beam ejection unit to eject the light to an outside of the light guide, and an extraction unit to reflect the light guided by the light guiding unit toward the light beam ejection unit. The light guiding members guide and eject a light, and the second light guiding member is bonded to, at least, the light guiding unit of the first light guiding member.