Multiview Projector Light Steering for Eyeglasses-Free 3D Resolution
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Solution Overview
Problem
Conventional multiview projector systems suffer from reduced spatial resolution at each viewpoint, leading to degraded image quality, eyeglasses-related discomfort, and lack of motion parallax depth cues, which hinder a realistic and enjoyable 3D viewing experience.
Innovation Solution
Incorporating an active light steering element between the projector and screen to temporally multiplex images, allowing for dynamic adjustment of spatial, temporal, and color resolutions, and enabling the production of higher spatial resolution images at each viewpoint, while also providing a motion parallax depth cue without the need for eyeglasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple viewpoints are multiplexed on a single screen without light steering, then the system structure is simple, but the spatial resolution at each viewpoint is reduced
Solution Approach 1:
The patent employs a dynamic light steering element (such as a galvanometer mirror or MEMS device) that actively scans and directs light to different spatial locations on the screen in sequence. This dynamic positioning allows the system to maintain high spatial resolution at each viewpoint by temporally multiplexing multiple views across different screen regions, rather than statically dividing the screen into low-resolution zones.
Solution Approach 2:
The patent introduces temporal dimension to resolve the spatial resolution conflict. By scanning light steers through different angles and positions over time, multiple viewpoints are presented in rapid succession at different locations on the screen. This temporal multiplexing allows high spatial resolution to be maintained for each view while accommodating multiple viewpoints within the same physical screen area.
2Reliability
If eyeglasses are used for 3D viewing, then left and right images can be separated, but image brightness is reduced and viewer comfort decreases
Solution Approach 1:
The patent removes the eyeglasses component from the 3D viewing system entirely. Instead of using polarized or spectral filters in eyeglasses to separate left and right images, the system uses a light steering element to spatially and temporally direct separate images to different locations on the screen, allowing viewers to see 3D effects without any optical filters or additional components.
Solution Approach 2:
The patent introduces a light steering element as an intermediary device between the projector and screen. This mediator actively directs light to different spatial positions to create separate viewing zones for left and right images, replacing the passive filtering mechanism of eyeglasses with an active optical steering mechanism that achieves 3D separation without reducing brightness or requiring additional components.
3Adaptability or versatility
If conventional multiview projection is used, then multiple viewpoints are provided, but motion parallax depth cues are absent
Solution Approach 1:
The patent uses a dynamically controllable light steering element that can rapidly change its angular position and scanning pattern. This dynamic capability enables the system to present different viewpoints that correspond to different virtual camera positions, allowing viewers to experience motion parallax as they move their heads. The light steers can be adjusted in real-time to maintain proper perspective relationships between multiple views.
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 enhances image quality by allowing trade-offs between spatial, temporal, and color resolutions, providing a higher spatial resolution at each viewpoint and enabling an eyeglasses-free, motion parallax-enhanced 3D viewing experience.
Implementation Method 1
Front-view projector system 10 includes a projector 12 and a reflective screen 14. Light is projected from projector 12 to screen 14. Screen 14 then reflects the light toward a viewing area in front of the screen.
Implementation Method 2
an active light steering element positioned in the light path between the projector and the screen. The light steering element is operable to sequentially scan light across the screen surface.
Data Source
AI summary
A projector system includes an imaging device operable to direct light to a reflective screen, and an active light steering element placed in the light path between the imaging device and the screen. The steering element is operable to sequentially scan the light across the screen. The steering element may be used to temporally multiplex images at different viewpoints. The steering element enables trade-offs to be made between spatial, temporal, color and/or viewpoint resolutions of the images displayed by the imaging device.