Band-Like Phosphor Substrate for Projector Illumination
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Solution Overview
Problem
Conventional projector technologies using phosphor layers divided into regions for color emission suffer from phosphor deterioration due to concentrated laser light irradiation, leading to increased cost and device size, and require multiple disks for each color, which is inefficient.
Innovation Solution
An illuminating device with a substrate featuring band-like phosphors and light collecting units that collect and distribute light components along a predetermined direction, allowing for sequential lighting of multiple phosphors within a single frame period to prevent phosphor deterioration and reduce device size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If phosphor layers are divided into regions and a disk is rotated to emit different colors, then color light components can be obtained, but the concentrated laser light irradiation causes phosphor deterioration
Solution Approach 1:
The phosphor layer is divided into multiple regions (first region with first phosphor, second region with second phosphor, third region with third phosphor) that emit different colors. This segmentation allows the laser beam to be distributed across multiple phosphor regions sequentially, preventing concentrated irradiation on a single phosphor area and thereby reducing phosphor deterioration while maintaining color emission capability.
2Adaptability or versatility
If multiple disks are used for each color, then color emission can be achieved, but device size and cost increase
Solution Approach 1:
Multiple phosphor layers emitting different colors are integrated into a single disk structure. The first phosphor, second phosphor, and third phosphor are arranged in different regions on the same disk, allowing all color emission functions to be combined in one component rather than requiring separate disks for each color, thus reducing device size and cost.
3Illumination intensity
If laser light is emitted onto a limited area in a concentrated manner, then phosphor characteristic deterioration occurs, but alternative light sources are needed to avoid this
Solution Approach 1:
The disk is rotated to periodically bring different phosphor regions into the laser beam path. This periodic action distributes the continuous laser irradiation across multiple phosphor regions over time, preventing any single phosphor area from being exposed to concentrated light for extended periods, thereby maintaining phosphor characteristics while preserving light emission efficiency.
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 effectively reduces phosphor deterioration and device size while maintaining efficient color emission, achieving a compact and cost-effective projector design by using a single substrate with band-like phosphors and light collecting units for sequential lighting.
Implementation Method 1
a phosphor layer that converts ultraviolet light emitted by the light emitting diode to visible light
Implementation Method 2
a light emitting diode, a phosphor layer that converts ultraviolet light emitted by the light emitting diode to visible light
Data Source
AI summary
An illuminating device for emitting light onto a light modulating element that forms an image in accordance with a modulation signal and irradiates a target to be illuminated with light, the illuminating device includes a substrate on which equal to or more than two phosphors that emit light with exciting light are formed in a band-like form along a predetermined direction, equal to or more than two light collecting units that are arranged for the respective equal to or more than two phosphors, and collect light components emitted from the respective equal to or more than two phosphors, and a driving unit that drives the substrate in the predetermined direction.