Wearable Display Slit Grating for Multi-Depth Imaging
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Solution Overview
Problem
Wearable display devices, such as VR and AR devices, suffer from poor display effects and visual fatigue due to mismatched focus points of the user's eyes on a fixed imaging face, leading to different convergence and focusing depths.
Innovation Solution
A wearable display device with a display panel and a slit grating that allows rays emitted by sub-pixels to intersect, creating multiple imaging faces to align focus points of the user's eyes, reducing visual fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed imaging face is used in wearable display devices, then the device structure is simple, but the focus points of the user's eyes cannot be aligned, causing poor display effects and visual fatigue
Solution Approach 1:
The imaging face is segmented into multiple imaging faces (first imaging face, second imaging face, etc.) positioned at different distances from the display panel. Each imaging face corresponds to a specific focusing depth, allowing the user's eyes to focus at the same point as both convergence and focusing depths. This segmentation resolves the contradiction by providing multiple focal planes while maintaining a relatively simple overall device structure.
Solution Approach 2:
The patent introduces a new dimension to the imaging face by creating multiple imaging faces at different distances from the display panel along the optical axis. This dimensional expansion allows rays from the same pixel to form images at multiple depths, enabling the user's eyes to find a focal point that satisfies both convergence and focusing requirements, thereby improving display effect without significantly complicating the device structure.
2Reliability
If multiple imaging faces are created to align focus points, then visual fatigue is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent replaces complex mechanical adjustment mechanisms with an optical solution using a grating structure. The grating is disposed at a specific distance from the display panel and has precisely controlled parameters (distance, width, transparency) that enable the formation of multiple imaging faces. This substitution of mechanical complexity with optimized optical design achieves multiple imaging faces while keeping the device structure relatively simple and improving visual comfort.
Solution Approach 2:
The patent optimizes specific parameters of the grating structure, including its distance from the display panel, width, and transparency ratio, to achieve the desired multiple imaging faces effect. By carefully controlling these parameters, the system creates multiple focal planes that align with the user's eye focus points, thereby improving visual comfort without requiring complex device architecture.
3Ease of manufacture
If the grating distance and parameters are not optimized, then device manufacturing is easier, but ray intersection and multiple imaging face formation are insufficient
Solution Approach 1:
The patent specifies preliminary design values for the grating distance and parameters that are optimized in advance to achieve proper ray intersection and multiple imaging face formation. By pre-calculating and specifying these parameters (grating distance, width, transparency), the system ensures that rays from the display panel will properly intersect to form multiple imaging faces, balancing manufacturing ease with the precision needed for effective ray intersection.
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 ensures equal focusing depth for each eye, enhancing the display effect and reducing visual discomfort by aligning focus points on multiple imaging faces.
Implementation Method 1
a distance W between the display panel and a viewing face satisfies: W=n*(y-g)/(n-1) where n represents a refractive index of a medium between the slit grating and the display panel
Data Source
AI summary
Provided is a wearable display device. The wearable display device includes a display panel including a plurality of pixel island groups arranged along a first direction, wherein each of the plurality of pixel island groups includes a plurality of pixel islands arranged along a second direction, each of the plurality of pixel islands including a plurality of sub-pixels arranged along the first direction; and the second direction is intersected with the first direction; and a slit grating disposed on a light-exiting side of the display panel, wherein the slit grating includes a plurality of slits arranged along the first direction and extending along the second direction, each of the slits being configured to exit rays emitted by the sub-pixels in at least one of the plurality of pixel island groups.