Light Source Adjusting Device for Projector Luminance
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Solution Overview
Problem
Conventional projectors using LEDs as light sources face challenges with low luminance and light emitting efficiency due to divergent light beams, and increasing the number of LEDs results in a larger projector volume and complex internal components, while mechanical color wheel technologies suffer from long response times and reliability issues.
Innovation Solution
A light source adjusting device comprising a first angle selecting layer, a wavelength converting layer, and a second angle selecting layer converts a short-wavelength light source into a long-wavelength light source with improved luminance and efficiency, using a multi-layer coating and dichroic mirrors to optimize beam angles and wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of LEDs is increased to improve luminance, then the luminance performance is improved, but the projector volume becomes excessively large and internal components become complex
Solution Approach 1:
The patent changes the optical parameters of the light beam by introducing angle-selecting layers with specific refractive indices and thicknesses. These layers modify the beam's propagation angle and concentration, transforming the divergent LED light into a more directional beam that achieves higher luminance without requiring additional light sources or increasing projector volume.
2Duration of action of stationary object
If conventional LEDs are used as light source, then the service life is long and start-up period is short, but the light beam is divergent resulting in poor luminance and light emitting efficiency
Solution Approach 1:
The patent introduces angle-selecting layers as intermediary optical components between the LED light source and the projection system. These layers act as mediators that transform the divergent light beam into a concentrated beam with improved luminance, while the LED itself maintains its long service life characteristic. The intermediary layers solve the luminance issue without compromising the reliability benefits of LED technology.
3Adaptability or versatility
If blue LEDs or UV light are used to excite phosphors on color wheel, then the three primary colors can be generated, but the color wheel has long response time and is liable for failure after extended operation
Solution Approach 1:
The patent replaces the mechanical rotary color wheel system with a stationary optical system using angle-selecting layers and wavelength-converting materials. Instead of mechanically rotating a color wheel to generate different colors, the system uses optical components to transform and direct light beams, eliminating mechanical moving parts that cause long response times and reliability issues while maintaining color generation capability.
4Adaptability or versatility
If blue LEDs or UV light are used to excite phosphors, then color generation is achieved, but the luminance and light emitting efficiency remain poor
Solution Approach 1:
The patent changes the optical parameters of the light beam through angle-selecting layers with specific refractive indices and thicknesses. These layers modify the beam's propagation angle and concentration, transforming the divergent light into a concentrated beam that achieves higher luminance and light emitting efficiency while maintaining color generation capability through wavelength-converting materials.
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 luminance and light emitting efficiency of projectors, reducing the need for multiple LEDs and minimizing projector size, while avoiding mechanical failure and long response times associated with prior technologies.
Implementation Method 1
The first angle selecting layer receives the first beam and allows a first portion of the first beam to pass therethrough to form a second beam
Implementation Method 2
The wavelength converting layer receives the second beam from the first angle selecting layer and converts the second beam with the first wavelength into a third beam with a second wavelength
Implementation Method 3
The second angle selecting layer receives the third beam and allows a third portion of the third beam to pass therethrough to form a fourth beam
Data Source
AI summary
A light source adjusting device and a projection system comprising the light source adjusting device are provided. The projection system further comprises a light source module which is capable of providing a first beam with a first wavelength. The light source adjusting device comprises a first angle selecting layer, a wavelength converting layer and a second angle selecting layer. The first angle selecting layer receives the first beam and allows a first portion of the first beam to pass therethrough to form a second beam that also has the first wavelength. The first portion of the first beam is a portion of the first beam that is less than an incident angle. The wavelength converting layer receives the second beam transmitted from the first angle selecting layer and converts the second beam with the first wavelength into a third beam with a second wavelength. The second angle selecting layer receives the third beam and allows the third portion of the third beam to pass therethrough to form a fourth beam that also has the second wavelength. The third portion of the third beam is a portion of the third beam that is less than an emergence angle. The second wavelength is larger than the first wavelength, and the emergence angle is less than the incident angle.