Variable-Diaphragm Light Projection for Wide-Angle Eyeball Display
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Solution Overview
Problem
Conventional light projection devices struggle to allow image light to enter the eyeball from a desired direction and at a wide viewing angle, regardless of the orientation of the eyeball.
Innovation Solution
A light projection device with a diaphragm that is variable in position and includes a pixel array, integrated into a 4f optical system, to guide image light to an optical element on the eyeball, allowing for adjustable diaphragm position, size, and transmittance based on eyeball information detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional optical system is used without a variable diaphragm, then the device structure is simpler, but the ability to allow image light to enter the eyeball from a desired direction at a wide viewing angle is limited
Solution Approach 1:
The patent introduces a variable diaphragm that can dynamically adjust its opening position and size based on the detected eyeball orientation. This dynamic adjustment allows the optical system to adapt to different viewing angles and eyeball positions, resolving the contradiction between viewing angle adaptability and device complexity by making the diaphragm parameters changeable rather than fixed
Solution Approach 2:
The patent changes the parameters of the diaphragm (opening position, opening size, transmittance) based on detected eyeball information. By making these parameters variable rather than fixed, the system achieves wide viewing angle adaptability while managing complexity through controlled parameter adjustment rather than complex mechanical structures
2Adaptability or versatility
If the diaphragm opening position is fixed, then the optical system is simpler, but image light cannot be guided to enter the eyeball from a desired direction when the eyeball orientation changes
Solution Approach 1:
The patent employs an eyeball information detecting unit that provides feedback on eyeball orientation to a control unit. This feedback mechanism enables the diaphragm to adjust its opening position dynamically, ensuring image light enters the eyeball from the desired direction while maintaining manageable control complexity through automated feedback-based adjustment
3Manufacturing precision
If a variable diaphragm with pixel array is introduced, then image light can be guided precisely to the eyeball, but the device size and power consumption increase
Solution Approach 1:
The patent replaces traditional mechanical diaphragm adjustment mechanisms with a pixel array-based electronic control system. This substitution allows precise control of light guidance through electronic pixel switching rather than mechanical movement, achieving high precision while reducing device weight and complexity
Solution Approach 2:
The patent achieves precise light guidance by changing the transmittance parameter of individual pixels in the diaphragm array. By controlling which pixels are transparent or opaque, the system achieves precise light guidance without heavy mechanical components, thus reducing device weight while maintaining precision
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
Enables image light to enter the eyeball from a desired direction at a wide viewing angle, providing a focus-free state and high-contrast display, suitable for head-mounted devices with low power consumption and reduced size.
Implementation Method 1
the optical element is a diffractive optical element
Data Source
AI summary
The purpose of the present invention is to provide a light projection device that can allow image light to enter an eyeball of a user at a wide viewing angle from a desired direction, regardless of the orientation of the eyeball. The light projection device of the present invention includes: an image light generation system that generates image light; and a projection system that projects the image light generated by the image light generation system onto an optical element worn on or embedded in an eyeball of a user, in which the projection system includes a diaphragm that is disposed on an optical path of the image light from the image light generation system and that is variable in at least a diaphragm position.