AR Optical Element Group for Large-Angle Light Filtering
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Solution Overview
Problem
Augmented Reality (AR) systems face issues with overlapping images due to light at large angles entering the optical system, which degrades display quality.
Innovation Solution
An electronic device comprising an optical element group with polarizing elements and compensation films, along with a light control element, is designed to filter and control light at large angles, improving image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light at large angles is allowed to enter the optical system, then the ambient light intensity in the virtual image region is reduced, but overlapping images are produced and display quality is destroyed
Solution Approach 1:
The patent changes the optical parameters by introducing polarizing elements with specific polarization directions and compensation films with specific retardation values. The first polarizing element has polarization direction at 45 degrees to the x-axis, the second polarizing element has polarization direction at -45 degrees to the x-axis, and the compensation film has retardation of 60-120 degrees. These parameter changes enable selective light transmission that reduces ambient light intensity while preventing overlapping images.
Solution Approach 2:
The patent uses a composite optical structure combining multiple polarizing elements and compensation films. The optical element group consists of a first polarizing element, a second polarizing element, and a first compensation film arranged in sequence. This composite structure leverages the different optical properties of each component to achieve both ambient light reduction and image quality preservation.
2Reliability
If polarizing elements and compensation films are added to reduce light at large angles, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent divides the optical control function into separate segments: a first polarizing element for initial polarization, a first compensation film for phase compensation, and a second polarizing element for final polarization control. Each segment performs a specific function, allowing the system to achieve complex optical control through modular components rather than a single complex element.
Solution Approach 2:
The first compensation film acts as an intermediary element between the two polarizing elements. It compensates for the phase difference introduced by the polarizing elements, enabling the system to achieve the desired light control without requiring the polarizing elements to be directly adjacent, thus simplifying the overall design.
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 reduces the transmittance of light at large angles, enhancing the display quality and clarity of virtual images in AR systems.
Implementation Method 1
The optical element group includes a first polarizing element, a second polarizing element, and a first compensation film
Implementation Method 2
The first compensation film is disposed between the first polarizing element and the second polarizing element
Data Source
AI summary
An electronic device includes an optical element group and a light control element. The optical element group includes a first polarizing element, a second polarizing element, and a first compensation film. The first compensation film is disposed between the first polarizing element and the second polarizing element. The light control element is disposed corresponding to the optical element group. The second polarizing element is disposed between the first compensation film and the light control element.