Optical Waveguide Lens Filling Member for Near-Eye Display Stability
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Solution Overview
Problem
Existing near-eye display devices with optical waveguide lenses suffer from deterioration in imaging effect due to water vapor and dust entering air gaps between stacked sheets, leading to instability and reduced service life.
Innovation Solution
The optical waveguide lens is designed with filling members having a refractive index less than or equal to 1.3, which fill air gaps between stacked sheets and a cover plate to prevent external impurities, enhancing imaging stability and reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air gaps are provided between adjacent optical waveguide sheets, then total reflection of light is enhanced, but water vapor and dust enter the air gaps causing deterioration of imaging effect
Solution Approach 1:
A filling member with refractive index between 1.0 and 1.3 is introduced as an intermediary substance into the air gap between optical waveguide sheets. This filling member prevents water vapor and dust from entering while maintaining the optical path for total internal reflection, thus resolving the contradiction between enhancing reflection and preventing harmful factor entry.
Solution Approach 2:
The air gap between optical waveguide sheets is replaced with a controlled environment by filling it with a substance having specific refractive index properties. This creates an inert optical environment that prevents contamination from external harmful factors while maintaining the necessary optical conditions for total internal reflection.
2Object-affected harmful factors
If filling members are provided in air gaps, then entry of water vapor and dust is reduced, but imaging effect may be affected by refractive index mismatch
Solution Approach 1:
The refractive index of the filling member is precisely controlled to be between 1.0 and 1.3, which is close to the refractive index of air (approximately 1.0). This parameter selection minimizes refraction and reflection losses at the interfaces, ensuring that the filling member prevents impurity entry without significantly affecting the imaging effect.
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 solution significantly reduces the entry of water vapor and dust, improving imaging stability and extending the service life of the optical waveguide lens, thereby enhancing the operating stability and user experience of near-eye display devices.
Implementation Method 1
at least one filling member each provided within a respective first air gap to fill at least part of the respective first air gap
Implementation Method 2
realize total reflection of light by a lens body of the optical waveguide lens
Implementation Method 3
the optical waveguide lens images an image generated by the projection device in front of human eyes through reflection and diffraction of the light
Implementation Method 4
each of the at least one filling member has a refractive index less than or equal to 1.3
Data Source
AI summary
An optical waveguide lens and a near-eye display device are provided. The near-eye display device includes a housing, a projection device and an optical waveguide lens mounted in the housing. The optical waveguide lens images an image produced by the projection device in front of human eyes, and includes stacked optical waveguide sheets. A first air gap is provided between adjacent optical waveguide sheets, and a filling member is provided in the first air gap to fill at least part of the first air gap, reducing the risk of water vapor, dust, and other fine impurities in the external environment entering the first air gap, improving the imaging effect and stability of the optical waveguide lens, and prolonging the service life of the optical waveguide lens, which further improves the operational stability and service life of the near-eye display device and the user experience.