Diffraction Light Guide Plate Vertical Stacking
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Solution Overview
Problem
Existing diffraction light guide plates for AR, MR, or VR display units face issues with image quality degradation due to the spacing of diffraction optical devices in the horizontal direction, leading to inefficient light extension and potential external light interference, which affects the exterior appearance and functionality.
Innovation Solution
A diffraction light guide plate design with an intermediate diffraction optical device comprising a main and auxiliary diffraction optical device, spaced vertically, to direct diffracted light from an input diffraction optical device to an output diffraction optical device, optimizing light extension and reducing external light interference by adjusting diffraction ratios and orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If diffraction optical devices are spaced in the horizontal direction, then light extension is achieved, but image quality degrades due to external light interference
Solution Approach 1:
The patent transitions from horizontal spacing to vertical stacking of diffraction optical devices. By arranging multiple diffraction optical devices in the vertical direction (different layers) rather than spacing them horizontally, the system achieves light extension while avoiding external light interference that affects horizontal arrangements. This dimensional change allows the light to be extended through multiple diffraction events in the vertical axis without exposing intermediate regions to external light.
Solution Approach 2:
The patent implements a nested structure where multiple diffraction optical devices are positioned within different layers of the light guide unit. The first diffraction optical device is in a first region, the second diffraction optical device is in a second region below the first, and the third diffraction optical device is in a third region below the second. This nested vertical arrangement allows each device to process light sequentially without external interference, while collectively achieving the desired light extension effect.
2Object-affected harmful factors
If diffraction optical devices are arranged in a compact vertical stack, then external light interference is reduced, but device complexity increases
Solution Approach 1:
The patent resolves the complexity issue by utilizing the vertical dimension (z-axis) through multiple layers of the light guide unit. Instead of increasing horizontal complexity with spaced devices, the system stacks diffraction optical devices vertically at different depths within the light guide unit. This approach contains the complexity within the vertical structure while maintaining a compact horizontal footprint, making the system more manageable despite the increased number of components.
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 design prevents image quality degradation by optimizing light extension and reducing external light interference, enhancing the image output and aesthetic appeal of the display device.
Implementation Method 1
a second diffraction optical device, which is optically coupled to the first diffraction optical device through the light guide unit, and allows the light received from the first optical device to be one-dimensionally extended in a first direction by diffraction
Implementation Method 2
the diffraction, in which a light movement path is changed to a progress direction of the total reflection, is performed several times
Data Source
AI summary
The present disclosure provides a diffraction light guide plate, including a light guide unit, an input diffraction optical device configured to receive light from a light source and diffract the received light, an intermediate diffraction optical device configured to receive the diffracted light from the input diffraction optical device and extend the received light one-dimensionally by diffraction, and an output diffraction optical device configured to receive the extended light from the intermediate diffraction optical device and output the received light from the light guide unit by diffraction. The intermediate diffraction optical device and the output diffraction optical device are separately disposed in regions divided horizontally on the light guide unit, and the intermediate diffraction optical device includes a main intermediate diffraction optical device and an auxiliary intermediate diffraction optical device, which are disposed separate apart from each other vertically on the light guide unit.