Light-Guide Blocking Structure for Ghosting Reduction
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Solution Overview
Problem
Existing light-guiding devices for see-through viewing often cause image light to exit in unintended directions due to the vertical center position of the light-guiding member and light transmission member being coincident, leading to distortion and ghosting effects.
Innovation Solution
A light-guiding device with a central member incorporating a light-guide blocking structure that absorbs, scatters, or diffuses light, preventing image light from one optical member to the other, thereby reducing ghosting and ensuring accurate light guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the vertical center position of the light-guiding member and the light transmission member are coincident, then the structure is simplified and alignment is easier, but image light exits in unintended directions causing ghosting and distortion
Solution Approach 1:
A light blocking member is introduced as an intermediary element between the light-guiding member and the light transmission member. This blocking member prevents image light from the left light-guiding member from entering the right light transmission member, and vice versa, thereby eliminating the ghosting effect while maintaining the simplified coincident center alignment structure
Solution Approach 2:
The light transmission member is divided into a left light transmission portion and a right light transmission portion. Correspondingly, the light blocking member is segmented into a left light blocking portion and a right light blocking portion, with each segment positioned to block light from the opposite side, preventing cross-contamination of image light while allowing proper light transmission for each eye
2Manufacturing precision
If a light blocking member is added to prevent ghosting, then image guidance accuracy is improved, but device complexity increases
Solution Approach 1:
The light blocking member is integrated with the light transmission member as a unified component. The left and right light blocking portions are formed as integral parts of the light transmission member, eliminating the need for separate blocking components and reducing assembly complexity while maintaining effective light blocking functionality
Solution Approach 2:
The light transmission member serves multiple functions: it transmits light from the corresponding light-guiding member, blocks light from the opposite side, and provides structural support. This multi-functionality reduces the overall number of components needed in the system
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 effectively suppresses image light incidence between optical members, reducing ghosting and maintaining clear, distortion-free see-through viewing by absorbing or diffusing light within the central member, ensuring precise light guidance and improved image clarity.
Implementation Method 1
a light-guide blocking structure that suppresses light from being incident from one end to another end of the central member by absorbing, scattering, or diffusing the light
Implementation Method 2
a light-guide blocking structure that suppresses light from being incident from one end to another end of the central member by absorbing, scattering, or diffusing the light
Implementation Method 3
a light-guide blocking structure that suppresses light from being incident from one end to another end of the central member by absorbing, scattering, or diffusing the light
Data Source
AI summary
A light-guiding device includes a pair of light-guiding portions, a pair of light-incident portions that causes image light to be incident on the respective pair of light-guiding portions, and a pair of light-emitting portion that causes image light guided by the respective pair of light-guiding portions to exit outside, in which a pair of optical members including the pair of light-guiding portions are coupled by a central member having light transmissivity, and in which the central member includes a light-guide blocking structure that suppresses light from being incident from one end to another end of the central member by absorbing the light.