MEMS Scanning Mirror Projection for Large 4K Displays
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Solution Overview
Problem
Existing projection devices face challenges in achieving high frame rates for large-screen displays due to the inverse proportion between scanning angle and scanning frequency, leading to increased scanner size and optical system complexity, particularly when displaying high-resolution images like 4k.
Innovation Solution
A projection device with a light emission display panel arranged in a matrix shape, a scanning mirror for two-dimensional scanning, and a projection optical system that guides imaging light from the panel to the mirror, utilizing a MEMS scanner to reduce scanner size and enhance scanning efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the scanning angle is increased to achieve large screen display, then the display size is improved, but the scanning frequency is reduced leading to low frame rate
Solution Approach 1:
The patent segments the scanning function into two independent dimensions: horizontal scanning is performed by the natural rotation of the scanner, while vertical scanning is achieved by tilting the scanner axis. This segmentation allows each dimension to be optimized independently, enabling large display areas without compromising frame rate in either direction.
Solution Approach 2:
The patent introduces a new dimensional approach by tilting the scanner axis relative to the optical axis, creating a three-dimensional scanning geometry. This dimensional change enables the scanner to cover a larger display area while maintaining high scanning frequency through coordinated rotation and tilting motions.
2Manufacturing precision
If the panel size is increased to display more pixels for high resolution, then the image resolution is improved, but the scanner size is increased leading to system complexity
Solution Approach 1:
The patent employs dynamic scanning where the scanner rotates and tilts to project images sequentially across different regions of the display screen. This dynamic approach eliminates the need for a physically large scanner, as the same scanner components are reused across multiple scanning positions and angles to achieve high-resolution display.
Solution Approach 2:
The patent uses optical copying where the scanner projects multiple copies of the same image data to different spatial locations on the screen during sequential scanning. This allows high-resolution imagery to be displayed across large areas without requiring proportionally larger physical scanner components.
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 enables high-resolution image projection on large screens with improved frame rates by optimizing scanner size and scanning efficiency, allowing for efficient two-dimensional scanning and reduced optical system complexity.
Implementation Method 1
a scanning mirror configured to reflect, toward a scanned surface, imaging light emitted from the light emission display panel and perform two-dimensional scanning of the reflected imaging light on the scanned surface
Data Source
AI summary
A projection device according to the present disclosure includes a light emission display panel in which a plurality of pixels including a light emission element are arranged in a matrix shape, a scanning mirror configured to reflect, toward a scanned surface, imaging light emitted from the light emission display panel and performs two-dimensional scanning of the reflected imaging light on the scanned surface, and a projection optical system configured to guide the imaging light from the light emission display panel to the scanning mirror.