Multiplexed Microprojector Head-Up Display for Simpler 3D Optics
Solution Overview
Problem
Existing head-up display systems face challenges with increased size, weight, cost, and power consumption due to redundant optical componentry, particularly in wearable stereoscopic displays, and require precise alignment of multiple optical systems for effective 3D display.
Innovation Solution
A microprojector is configured to sequentially project display images for different fields-of-view, using a switchable redirection optic to direct each image to the appropriate field-of-view, reducing the number of microprojectors needed and simplifying alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple microprojectors are used for stereoscopic displays, then 3D image quality is improved, but device size, weight, cost, and power consumption increase
Solution Approach 1:
The patent combines multiple microprojectors into a single integrated microdisplay device that sequentially projects images for different fields-of-view. This merging approach maintains stereoscopic display capability while reducing the overall number of discrete optical engines, thereby decreasing device weight and complexity.
Solution Approach 2:
The microdisplay device operates by sequentially projecting images for different fields-of-view in alternating time intervals. This periodic action allows a single microdisplay to serve multiple optical paths, eliminating the need for simultaneous operation of multiple microprojectors and reducing overall system weight.
2Reliability
If multiple microprojectors are used for stereoscopic displays, then 3D image quality is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple microprojector functions into a single microdisplay device with sequential operation. This consolidation reduces the number of redundant optical components, alignment mechanisms, and control systems required, thereby simplifying device complexity while maintaining stereoscopic functionality.
Solution Approach 2:
The single microdisplay device is designed to perform multiple functions by sequentially serving different optical paths for stereoscopic display. This multi-functionality eliminates the need for dedicated microprojectors for each eye or field-of-view, reducing overall system complexity.
3Reliability
If multiple microprojectors are used for stereoscopic displays, then 3D image quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple microprojector functions into a single microdisplay device, reducing the total number of expensive optical components required. This merging approach lowers bill of materials costs, assembly costs, and testing costs, thereby reducing overall manufacturing cost while maintaining 3D image quality.
4Reliability
If multiple microprojectors are used for stereoscopic displays, then 3D image quality is improved, but power consumption increases
Solution Approach 1:
The microdisplay device uses periodic action by sequentially activating different projection paths in alternating time intervals. This approach ensures that only one microdisplay is actively projecting at any given moment, halving the power consumption compared to running multiple microprojectors simultaneously, while still delivering full stereoscopic image quality.
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
This approach reduces the complexity and resources required for stereoscopic displays by minimizing the number of microprojectors and simplifying alignment, while maintaining effective 3D imagery presentation.
Implementation Method 1
a redirection optic switchable between first and second optical states. The redirection optic is configured to receive a display image from the microprojector, to convey the display image, in the first optical state, to the first viewer optic, and to convey the display image, in the second optical state, to the second viewer optic
Data Source
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AI summary
A head-up display system comprises a microprojector, first and second viewer optics, a redirection optic, and an electronic controller. Switchable electronically between first and second optical states, the redirection optic is configured to receive a display image from the microprojector, to convey the display image, in the first optical state, to the first viewer optic, and to convey the display image, in the second optical state, to the second viewer optic. The electronic controller is configured to, during a first interval, switch and maintain the redirection optic in the first optical state and cause the microprojector to form the display image based on first image data. The electronic controller is further configured to, during a second interval, switch and maintain the redirection optic in the second optical state and cause the microprojector to form the display image based on second image data.