Polarization Control Optical Elements Block Noise Light in Display Apparatus
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Solution Overview
Problem
Existing 3D image display technologies, particularly in virtual and augmented reality, struggle to minimize the impact of ambient illuminance on the immersive experience due to noise light interference, which affects the quality of the image perceived by the observer.
Innovation Solution
A display apparatus comprising an image forming device, a concave mirror, and a delivery optical system that includes a beam splitter and polarization control optical elements such as quarter wave plates and polarizers, configured to block noise light by selectively transmitting and reflecting image light based on its polarization state, thereby enhancing the immersive experience by reducing ambient noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a simple optical system is used to deliver image light, then device complexity is reduced, but noise light from ambient illuminance cannot be effectively blocked, degrading image quality
Solution Approach 1:
The patent introduces polarization control optical elements (quarter wave plates and polarizers) as intermediary components in the delivery optical system. These elements selectively transmit and block light based on their polarization states, enabling the system to distinguish between desired image light and harmful noise light from ambient illuminance, thereby resolving the contradiction between blocking noise light and maintaining system simplicity
Solution Approach 2:
The patent utilizes changes in the polarization parameter of light to achieve selective transmission and blocking. By configuring polarization control optical elements with specific polarization characteristics, the system can differentiate between image light with specific polarization states and noise light with different polarization states, enabling effective noise rejection without requiring complex mechanical or structural modifications
2Reliability
If polarization control optical elements are added to block noise light, then image quality and immersive sense are improved, but device complexity increases
Solution Approach 1:
The polarization control optical elements serve multiple functions simultaneously: they block noise light from ambient illuminance, maintain the immersive sense by preserving image light quality, and can be integrated into existing optical paths without requiring separate dedicated components. This multi-functionality approach allows the system to improve reliability while minimizing the increase in device complexity
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 blocks noise light from ambient illuminance, enhancing the immersive sense for the observer by ensuring that only intended image light reaches the field of view, thereby improving the overall image quality and viewer engagement.
Implementation Method 1
the at least one polarization control optical element is configured to block noise light incident to the delivery optical system from the field of view of the observer. The image light provided by the image forming device may have a first polarization state which is linear polarization in a first direction.
Implementation Method 2
The beam splitter may include a polarization beam splitter that is obliquely disposed with respect to a travel path of the image light from the image forming device, the polarization beam splitter being configured to reflect light of the first polarization state, and transmit light of a second polarization state that is perpendicular to the first polarization state
Implementation Method 3
a concave mirror configured to focus the image light provided by the image forming device
Implementation Method 4
The beam splitter may be obliquely disposed with respect to a travel path of the image light from the image forming device
Data Source
AI summary
A display apparatus includes an image forming device configured to provide image light; a concave mirror configured to focus the image light provided by the image forming device; and a delivery optical system configured to deliver the image light provided by the image forming device to a field of view of an observer via the concave mirror, wherein the delivery optical system may include a beam splitter and at least one polarization control optical element, and wherein the at least one polarization control optical element is configured to block noise light incident to the delivery optical system from the field of view of the observer.