Optical Waveguide Polarization Conversion for Expanded Exit Range
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Solution Overview
Problem
Current optical waveguide elements have a limited light exit range, restricting the image display range of near-eye display apparatuses.
Innovation Solution
An optical waveguide device comprising an optical waveguide dielectric body, a first polarized reflection layer, and an optical structure layer, where the optical structure layer converts first polarized light into second polarized light, allowing the second polarized light to exit and preventing first polarized light from exiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reflective film is formed on the surface of the optical waveguide element to prevent light from exiting in regions where total reflection conditions are not met, then light propagation control is improved, but the light exit range is significantly limited
Solution Approach 1:
The patent changes the polarization state of light as a parameter to control light behavior. By converting first polarized light to second polarized light at a preset angle, the system enables light to exit through the reflective film layer, thereby expanding the light exit range without compromising propagation control
Solution Approach 2:
The patent applies different optical properties to different regions and angles. The reflective film layer selectively transmits second polarized light while reflecting first polarized light, creating localized functionality that allows light exit in specific angular ranges while maintaining control over other regions
2Productivity
If the optical waveguide element uses total reflection principle for light propagation, then light guidance efficiency is improved, but the display image range is restricted
Solution Approach 1:
The system maintains total reflection for first polarized light to ensure efficient light guidance, while introducing polarization conversion for light at preset angles to expand the display image range. This dual-mode approach preserves guidance efficiency while extending the visible display area
3Object-generated harmful factors
If a reflective film layer is used to control light exit, then light interference prevention is improved, but the exit region is limited to non-reflective film regions
Solution Approach 1:
The patent uses polarization state transformation to enable second polarized light to pass through the reflective film layer, thereby expanding the exit region. This allows light to exit through previously blocking regions while the reflective film continues to prevent interference from first polarized light
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 design increases the light exit range of the optical waveguide device, thereby enhancing the image display range of the display apparatus and improving the immersive experience for users.
Implementation Method 1
most optical waveguide elements currently propagate light based on the principle of total reflection
Implementation Method 2
The first polarized reflection layer is configured to reflect the first polarized light and transmit a second polarized light
Implementation Method 3
The optical structure layer is configured to convert the first polarized light, incident at a preset angle, into the second polarized light
Data Source
AI summary
An optical waveguide device, a display apparatus, and a display device are disclosed. The optical waveguide device includes an optical waveguide dielectric body, a first polarized reflection layer, and an optical structure layer. The optical waveguide dielectric body includes a first surface and a second surface opposite to each other, the first polarized reflection layer is arranged on the first surface, and the optical structure layer is arranged on the second surface. The optical waveguide dielectric body is configured to propagate light, which includes a first polarized light. The first polarized reflection layer is configured to reflect the first polarized light and transmit a second polarized light. The optical structure layer is configured to convert the first polarized light incident at a preset angle into the second polarized light, reflect the second polarized light to the first polarized reflection layer, and reflect the first polarized light incident at another angle to the first polarized reflection layer. An exit region of the second polarized light is no longer limited to a region without a reflective film layer, thereby increasing a light exit range of the optical waveguide device.