Laser Illumination Spot Shaping for Projection Light Loss
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Solution Overview
Problem
The use of red, green, and blue lasers as illumination light sources in projection apparatuses results in oblong ovate light spots that can exceed the range of light uniforming elements, leading to light loss and inefficiency due to the shape mismatch between the light spots and the light uniforming elements.
Innovation Solution
Incorporating a light spot shaping element with rectangular microstructures that correspond to the aspect ratio of the light uniforming element's rectangular entering end, ensuring the light spot shape matches the light uniforming element, thereby improving light collecting efficiency and reducing light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If red, green and blue lasers are used as illumination light sources, then electro-optical conversion efficiency and color purity are improved, but light spot shape mismatch causes light loss and reduces optical efficiency
Solution Approach 1:
A light spot shaping element is introduced as an intermediary component between the laser light source and the light uniforming element. This element includes a microlens array that transforms the oblong ovate light spots from individual laser diodes into rectangular light spots, enabling proper coupling with the rectangular entering end of the light uniforming element and eliminating light loss due to shape mismatch
2Duration of action of stationary object
If laser diodes are used as illumination sources, then service life and brightness are improved, but the oblong ovate light spot shape exceeds the range of light uniforming elements
Solution Approach 1:
The light spot shaping element changes the geometric parameters of the light spot by using microlens arrays with specific focal lengths and spacing. Each microlens focuses the light from a laser diode into a rectangular spot with dimensions matching the light uniforming element's entering end, transforming the original oblong ovate shape into a compatible rectangular shape
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 configuration enhances optical efficiency by ensuring the light spot shape aligns with the light uniforming element, minimizing light loss and improving overall optical performance in projection apparatuses.
Implementation Method 1
each one of the microlenses of the light spot shaping element has a focal length that corresponds to a distance between the light spot shaping element and the light uniforming element
Data Source
AI summary
An illumination system including at least one laser light source, at least one light spot shaping element and a light uniforming element is provided. The at least one laser light source emits at least one laser beam. The light spot shaping element is disposed on a transmission path of the at least one laser beam. At least one surface of the light spot shaping element has multiple microstructures, and a shape of an orthogonal projection of each one of the microstructures on a reference plane perpendicular to an optical axis of the light spot shaping element is a rectangle. The light uniforming element is disposed on the transmission path of the laser beam, and the light uniforming element has a rectangular light entering end, wherein an aspect ratio of each microstructure of the light spot shaping element corresponds to an aspect ratio of the rectangular light entering end.