Solid State Light Source with Fluorescence Emission Plate
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Solution Overview
Problem
Existing projection display apparatus using solid-state light sources face challenges in achieving high brightness and compactness due to inefficient light condensation and combination, particularly as the number of solid-state light sources increases, leading to larger device sizes and light loss during transmission.
Innovation Solution
A light source device configuration featuring pairs of solid-state light source units with alternating arrangements of semiconductor lasers and condensing lenses, along with a reflection unit that increases light beam density, allows for efficient condensation and combination of light beams, resulting in a compact and bright light source. This configuration includes a fluorescence emission plate excited by polarized light, which emits white light by combining blue, green, and red components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of solid-state light sources is increased to achieve high brightness, then the brightness is improved, but the device size increases
Solution Approach 1:
The patent combines light beams from multiple solid-state light sources by condensing them onto a fluorescence emission plate. The condensing lenses focus the light from each LED onto specific regions of the plate, merging multiple light sources into a single compact unit that produces high brightness output without proportionally increasing device size.
Solution Approach 2:
The fluorescence emission plate serves as an intermediary element that receives and converts light from multiple LED sources. The plate absorbs light at specific wavelengths and re-emits it as white light, effectively mediating the combination of multiple light sources into a unified output while maintaining a compact form factor.
2Illumination intensity
If the number of solid-state light sources is increased to achieve high brightness, then the brightness is improved, but the light loss during transmission increases
Solution Approach 1:
The patent extracts and utilizes only the useful light components from each LED source by directing them through condensing lenses onto the fluorescence emission plate. This extraction process ensures that light is not lost during transmission but is instead efficiently converted and re-emitted as useful white light, minimizing energy loss.
Solution Approach 2:
The fluorescence emission plate changes the wavelength parameter of the incident light from individual LED wavelengths to a broader white light spectrum. This parameter transformation efficiently converts the energy from multiple LED sources into useful visible light, reducing energy loss during the transmission and conversion process.
3Temperature
If solid-state light sources are disposed discretely at predetermined intervals for cooling performance, then the cooling is improved, but the outline of exiting light beams becomes larger
Solution Approach 1:
The patent transitions from a one-dimensional linear arrangement of LED sources to a two-dimensional grid arrangement on the fluorescence emission plate. This dimensional change allows for better heat distribution across the plate while enabling the condensing lenses to focus light from multiple sources into a compact output region, reducing the light beam outline size.
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 projection display apparatus with improved light efficiency and reduced light loss, achieving long-life and high-definition projection with favorable color reproducibility.
Implementation Method 1
Each of light beams 114 exiting from the solid-state light source unit is condensed by a corresponding lens 115
Implementation Method 2
a reflection unit that reflects exiting light beams from the first and second solid-state light source units in one direction
Implementation Method 3
a fluorescence emission plate that is excited with light condensed by the first condensing part and emits fluorescence
Data Source
AI summary
A light source device includes: first and second solid-state light source units disposed opposite to each other, each unit including solid-state light sources; a reflection unit; a condensing part; and a fluorescence emission plate excited with a condensed light beam. The light sources in each of the units are arranged two-dimensionally with the optical axes oriented in an x-axis direction. Each column of the light sources of the first and the second light source units are arranged alternately in the y-axis direction. The reflection unit reflects the light beams from the light source units in the z-axis direction so as to be arranged into a two-dimensional array in a xy plane. A density of the reflected light beams in the x-axis direction is higher than that of the arrangement of the light sources in the z-axis direction. Light from solid-state light sources are condensed and combined efficiently, with a compact configuration.