Reflective Light Focusing System for Compact Laser Projection
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Solution Overview
Problem
Conventional light emitting devices for high-resolution displays and cinema projection systems require high brightness, leading to large and cumbersome designs due to the long focal length of focusing lenses, which increases the size of the device.
Innovation Solution
A light emitting device with a reflective light focusing system and a light collecting system that includes a non-emitting and non-focusing region, allowing the reflective light focusing system to penetrate through these regions, reducing the overall size by eliminating the need for additional length, and incorporating a light homogenizing rod or fly-eye lens pair for uniform light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional focusing lens is used to focus light from the laser array light source, then the light can be focused to a point, but the focal length is relatively long which makes the entire light emitting device long and large in size
Solution Approach 1:
The patent implements nesting by allowing the light collecting system to penetrate through the non-emitting region and non-focusing region of the reflective light focusing system. This nested configuration enables the light collecting system to be positioned within the structural space of the focusing system, thereby reducing the overall device length while maintaining effective light collection and focusing capabilities.
Solution Approach 2:
The patent transitions from a linear sequential arrangement to a multi-dimensional integrated structure. By positioning the light collecting system, non-emitting region, and non-focusing region on a common straight line and allowing penetration, the design utilizes spatial dimensionality to reduce the optical path length and compact the device structure while preserving focusing precision.
2Length of stationary object
If the light collecting system, non-emitting region and non-focusing region are positioned on a common straight line with penetration, then the device size is reduced, but the structural arrangement becomes more complex
Solution Approach 1:
The patent divides the reflective light focusing system into distinct functional regions: a focusing region and a non-focusing region (including a hollow center region). This segmentation allows the light collecting system to be positioned in the non-focusing region without interfering with the light focusing function, simplifying the overall structural arrangement while achieving compactness.
Solution Approach 2:
Instead of positioning the light collecting system sequentially after the focusing region, the patent inverts the conventional arrangement by allowing the light collecting system to penetrate through the non-focusing region that is positioned before the focusing region. This inverted spatial arrangement reduces device length while maintaining functional independence of each component.
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 a compact, high-brightness, and uniform light emitting device suitable for ultra-high brightness laser projection systems, reducing the size while maintaining high power and uniformity of the light output.
Implementation Method 1
a reflective light focusing system, including a focusing region and a non-focusing region, the focusing region focusing and reflecting an output light of the laser array light source
Implementation Method 2
the focusing region focusing and reflecting an output light of the laser array light source
Data Source
AI summary
A light-emitting device and a projection system, comprising: a laser array light source which comprises a non-light-emitting region and a light-emitting region consisting of a plurality of laser elements; a reflective light-condensing system which comprises a light-condensing region and a non-light-condensing region, wherein the light-condensing region is used for focusing and reflecting emergent light of the laser array light source; and a light-collecting system used for collecting and emitting the emergent light from the reflective light-condensing system. The light-collecting system, the non-light-emitting region and the non-light-condensing region are located in the same straight line parallel to a light axis of the emergent light of the laser array light source, and the light-collecting system passes through the non-light-emitting region and/or the non-light-condensing region. The light-emitting device and the projection system have small volumes and can emit high-brightness and uniform faculae.