Head-Mounted Display Shutter Array for MLA Crosstalk Control
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Solution Overview
Problem
Existing head-mounted display (HMD) devices using multi-lens arrays (MLAs) suffer from image quality degradation due to crosstalk and inefficiencies, leading to bulky and heavy designs that fail to achieve a lightweight and compact form factor.
Innovation Solution
Implementing a dynamic shutter array (DAS) interposed between the light engine and the MLA to control which the DASA is used to solve the technical problem of crosstalk and inefficiencies in MLA HMD devices by controlling light pathways with independently controllable shutters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single lens is used to focus the image, then the image can be focused for receipt by the user's eye, but the device becomes bulky and heavy
Solution Approach 1:
The single lens is divided into multiple lenses arranged in an array configuration. Each lens in the MLA focuses light from corresponding display elements, achieving the required image focusing capability while distributing the optical load across multiple smaller lens elements rather than one large lens, thereby reducing overall device weight and bulk.
2Weight of moving object
If a multi-lens array is used to reduce weight and size, then the device becomes lighter and more compact, but image quality deteriorates due to crosstalk
Solution Approach 1:
A light baffle is introduced as an intermediary element positioned between the display elements and the multi-lens array. The baffle structure selectively blocks stray light paths that would cause crosstalk between adjacent lenses while permitting the desired light paths to reach their corresponding lenses, thereby maintaining image quality in the lightweight MLA configuration.
3Volume of moving object
If a multi-lens array is used to achieve compact form factor, then the device size is reduced, but light distribution becomes inefficient
Solution Approach 1:
The light baffle is designed with spatially varying structures that are optimized for local light control requirements. Different regions of the baffle have different geometries and densities tailored to control light paths specific to each lens position in the MLA, maximizing light efficiency by directing light precisely where needed while minimizing waste and improving overall system efficiency in the compact form factor.
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 use of DASA enhances image quality and resolution by minimizing cross-talk and optimizing light distribution, resulting in a more compact and lightweight HMD design.
Implementation Method 1
The dynamically addressable shutter array comprises a first dynamically addressable shutter array and a second dynamically addressable shutter array interposed between the first multi-lens array and the second multi-lens array
Implementation Method 2
The optical assembly comprises a multi-lens array and a dynamically addressable shutter array interposed between the light engine and the multi-lens array
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3D
AI summary
This document relates to head mounted display devices. One example can include a layer of individually controllable pixels that can be energized to emit light and a layer of lenses that are physically aligned over the pixels. The example can also include a layer of shutters interposed between the pixels and the lenses and configured to be independently transitioned between a transmissive state and an opaque state to limit paths of the emitted light that reach the layer of lenses.