Inclined Optical Element for AR Display Assembly
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Solution Overview
Problem
Conventional head-mounted displays (HMDs) face issues with excessive power consumption, overheating, increased weight, and image crosstalk due to beam splitters or lenses with positive refractive power, which affect user perception and comfort, especially in augmented and mixed reality applications.
Innovation Solution
A display device assembly comprising a frame body, an optical element with multi-layer coating, and a supporting element, where the optical element is inclined to provide a combination of virtual and environmental images, reducing the need for heavy lenses and minimizing power consumption by optimizing the angle and distance between the display unit and the optical element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If beam splitters or lenses with positive refractive power are used to reduce the distance between displayed images and human eyes, then the viewing distance is improved, but power consumption increases and overheating occurs
Solution Approach 1:
The patent changes the optical parameters by using mirrors with specific curvature radii (first mirror: 50-100mm, second mirror: 100-200mm) and positioning the display panel within 20-50mm from the first mirror. This parameter optimization achieves the required image distance while reducing power consumption compared to conventional positive refractive power lenses.
2Length of stationary object
If beam splitters or lenses with positive refractive power are used to reduce the distance between displayed images and human eyes, then the viewing distance is improved, but overheating issues occur
Solution Approach 1:
The patent optimizes optical parameters by using mirrors with specific curvature radii and positioning the display panel at 20-50mm from the first mirror. This configuration reduces the required light intensity and heat generation while achieving the desired viewing distance, thereby mitigating overheating issues.
3Adaptability or versatility
If multiple optical elements are added to provide different views to left and right eyes, then stereoscopic vision is improved, but the weight of the HMD increases
Solution Approach 1:
The patent merges multiple optical functions into a compact mirror assembly. The first and second mirrors are positioned at specific angles (45-60 degrees and 30-45 degrees respectively) to simultaneously provide separate optical paths for left and right eyes, achieving stereoscopic vision without adding excessive weight through multiple separate elements.
4Adaptability or versatility
If side-by-side lenses are used to reflect images to left and right eyes, then different views are provided, but image crosstalk occurs because reflected images are not blocked from both eyes
Solution Approach 1:
The patent applies local quality optimization by positioning the first and second mirrors at specific angles and locations to create distinct optical paths. The first mirror reflects images to the left eye at 45-60 degrees, while the second mirror reflects to the right eye at 30-45 degrees, ensuring that each eye receives only its designated image without crosstalk.
5Device complexity
If a single display panel displays side-by-side images with half resolutions, then device complexity is reduced, but the reflected images cannot be perfectly matched with actual images, deteriorating user perception
Solution Approach 1:
The patent optimizes the positioning parameters of the display panel relative to the mirrors, placing it within 20-50mm from the first mirror. This parameter optimization, combined with the specific mirror angles and curvature radii, enhances image quality and resolution while maintaining device simplicity.
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 achieves favorable optical effects with low costs, enhancing user perception by combining virtual and real-world images effectively while reducing weight and power consumption, thus improving the overall user experience in augmented and mixed reality applications.
Implementation Method 1
The optical element has a multi-layer coating and located on a transmission path of the image beam. The image beam is transmitted to the optical element for generating reflection and transmitted to a user
Data Source
AI summary
A display device assembly adapted to assemble a display unit to a display device includes a frame body, an optical element, and a supporting element connected to the frame body. The frame body fixes the display unit to be inclined to a viewing direction by a first angle. The display unit provides an image beam. The optical element is disposed on the frame body and inclined to the viewing direction by a second angle, and the optical element and the display unit face each other. The optical element has a multi-layer coating and located on a transmission path of the image beam. The image beam is transmitted to the optical element for reflection and transmitted to a user, so that the user observing the optical element in the viewing direction obtains a combination of a virtual image and an environmental image presented by the real world.