Light Source Device Polarization Gap Elimination
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Solution Overview
Problem
Conventional light source devices for projection-type display apparatuses have a complex configuration due to numerous reflecting mirrors, leading to inefficiencies in light use efficiency due to gaps between light sources, which reduce the overall brightness.
Innovation Solution
A light source device comprising multiple light sources with different polarizations and wavelength bands, utilizing selective transmission elements and reflecting elements to combine light fluxes without gaps, allowing them to proceed in the same direction, thereby enhancing light use efficiency with a simpler configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a plurality of light sources are arranged at constant intervals to enhance brightness, then the brightness is improved, but gaps are formed between light fluxes and light use efficiency decreases
Solution Approach 1:
The patent introduces a third dimension (depth) by arranging light sources in three-dimensional space rather than just in a plane. The light sources are positioned at different depths along the optical axis, allowing their light fluxes to overlap and fill gaps that would exist in a two-dimensional arrangement. This spatial reconfiguration enables continuous light coverage while maintaining constant intervals between sources.
Solution Approach 2:
The patent combines light fluxes from multiple light sources arranged in three-dimensional space to create a merged, continuous light field. By positioning sources at different depths and orientations, their individual light fluxes overlap and merge, eliminating gaps and creating a unified illumination that improves both brightness and light use efficiency.
2Loss of energy
If a large number of reflecting mirrors are arranged corresponding to respective rows and columns of light sources to eliminate gaps, then light use efficiency is improved, but the configuration becomes complicated
Solution Approach 1:
The patent extracts and eliminates the need for complex mirror arrangements by reconfiguring the light sources themselves. Instead of using mirrors to redirect light and fill gaps, the invention directly positions light sources in three-dimensional space so their light fluxes naturally overlap and fill gaps, removing the intermediary mirror components entirely.
Solution Approach 2:
The patent replaces the mechanical mirror redirection system with a spatial arrangement system. Rather than using mirrors to mechanically redirect light paths, the invention uses precise three-dimensional positioning of light sources to naturally guide light fluxes into overlapping patterns, substituting a complex mechanical redirection system with a simpler spatial configuration.
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 light use efficiency by eliminating gaps between light sources, achieving higher brightness with a reduced number of mirrors and simplified setup, while maintaining sufficient cooling efficiency and ease of component arrangement.
Implementation Method 1
a first selective transmission element that transmits the light of the first polarization and reflects the light of the second polarization based on the polarization direction of the light
Implementation Method 2
a second selective transmission element that transmits combined light of the light of the first polarization and the light of the second polarization, and reflects the light of the third polarization based on the wavelength band of the light
Implementation Method 3
a third selective transmission element that transmits the combined light of the light of the first polarization and the light of the second polarization based on the polarization of the wavelength band, and reflects the light of the fourth polarization based on the polarization direction of the light
Implementation Method 4
A reflecting element reflects the light of the first polarization
Data Source
AI summary
A light source device includes a plurality of light sources with different polarizations. A combined wavelength band of the light of a first polarization and second polarization is a first wavelength band. A combined wavelength band of a third polarization and fourth polarization is a second wavelength band. A plurality of selective transmission elements transmits one or more combined light of one or more polarizations and reflects one or more light of one or more polarizations. Thus, the light of the first polarization, the light of the second polarization and the light of the third polarization passing through a third selective transmission element, and the light of the fourth polarization reflected by the third selective transmission element proceed in the same direction.