Columnar Phosphor Structure for Projector Light Efficiency
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Solution Overview
Problem
Conventional projector light sources, such as ultrahigh-pressure mercury lamps, face issues like short lifespan, difficulty in instantaneous turn-on, and degradation of liquid crystal light valves due to UV emission, and phosphor-based light emitting apparatuses suffer from reduced efficiency due to heat and light loss through gaps between divided phosphor sections.
Innovation Solution
A light emitting apparatus with columnar sections containing phosphors, where the light source radiates light obliquely to intersect the columnar direction, preventing light from entering the base and enhancing emission efficiency, and optionally using semiconductor layers to form quantum wells for improved light confinement and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the phosphor layer is divided into multiple sections to increase surface area for heat dissipation, then heat dissipation is improved, but light emission efficiency decreases due to gaps between sections allowing excitation light to enter the base
Solution Approach 1:
The invention transitions from a two-dimensional planar phosphor layer to a three-dimensional columnar structure. The phosphor is arranged in multiple columns extending in the thickness direction, which increases the heat dissipation surface area while the oblique light incidence ensures that excitation light enters the columns rather than passing through gaps to the base, thus resolving the contradiction between heat dissipation and light emission efficiency
Solution Approach 2:
The invention changes the geometric parameters of the phosphor structure by forming columnar sections with specific dimensions (width 1-10 μm, height 1-100 μm) and arranging them with controlled pitch. The oblique incidence angle of the excitation light is also optimized to ensure maximum light entry into columns while preventing direct base exposure, thereby improving both heat dissipation and light emission efficiency
2Illumination intensity
If a discharge lamp is used as the light source, then high luminance is achieved, but the light source has short lifespan and emits UV light that degrades liquid crystal light valves
Solution Approach 1:
The invention changes the light source from a discharge lamp to a light-emitting diode (LED), which operates at different physical principles. The LED emits blue light (wavelength 430-480 nm) that excites the phosphor to emit yellow light, achieving high luminance without UV emission and with significantly extended lifespan, thus resolving the contradiction between luminance and reliability
Solution Approach 2:
The invention uses a composite structure combining LED and phosphor materials. The blue LED light excites the phosphor layer (containing yellow phosphor particles) to produce high-luminance white light output, achieving the desired luminance while eliminating the harmful UV effects and short lifespan issues of discharge lamps
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 improves light emission efficiency by ensuring light is effectively absorbed and emitted by phosphors, reducing heat dissipation issues and prolonging the light source's lifespan, while allowing for higher luminance and cost-effective projector designs.
Implementation Method 1
a plurality of columnar sections which are provided at the base and each include a phosphor that emits light when irradiated with light emitted from the light source
Implementation Method 2
the first phosphor, the first semiconductor layer, and the second semiconductor layer form a quantum well structure, whereby electrons can be confined in the first phosphor
Implementation Method 3
the light source radiates the light to the columnar sections obliquely with respect thereto
Data Source
AI summary
A light emitting apparatus including a base, a light source, and a plurality of columnar sections that are provided at the base and each include a first phosphor that emits light when irradiated with light emitted from the light source, in which the light source radiates the light to the columnar sections obliquely with respect thereto.