Projector Illumination Device Using Dual Solid-State Modules
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Solution Overview
Problem
Conventional illumination systems for projectors face challenges in achieving high luminous flux, stability, and cost-effectiveness, particularly due to spectral overlap and the need for frequent servicing, which can lead to color deviations and inefficiencies in light usage.
Innovation Solution
The use of two solid-state-based illumination modules with overlapping spectra, where one module provides higher intensity in the red wavelength range, is employed to achieve higher luminous flux and stability, despite initial losses, by combining their luminescence to produce primary colors like red and green, and optionally incorporating a third module for blue light, without the need for active regulation or additional components like color wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two solid-state-based illumination modules with overlapping spectra are combined, then luminous flux is increased, but luminous power loss increases due to spectral overlap
Solution Approach 1:
The patent combines two solid-state-based illumination modules (first and second modules) with overlapping spectra to illuminate the light modulator. The first module provides green light and the second module provides red light, with their spectra significantly overlapping. This merging approach increases the total luminous flux available for illumination, directly resolving the contradiction by prioritizing productivity over energy efficiency.
2Ease of manufacture
If conventional LEDs are used for illumination, then cost is reduced, but service life and stability are compromised
Solution Approach 1:
The patent transitions from conventional LED illumination to solid-state-based illumination modules, representing a parameter change in the light source technology. This change improves service life and stability while maintaining cost-effectiveness, as the solid-state modules provide better aging behavior and color stability compared to traditional LEDs.
3Productivity
If high-pressure mercury lamps are used, then luminous flux is achieved, but servicing frequency increases and environmental impact worsens
Solution Approach 1:
The patent replaces the mechanical/electrical high-pressure mercury lamp system with solid-state-based illumination modules. This substitution eliminates the need for frequent bulb replacements and maintenance associated with mercury lamps, while also eliminating environmental concerns related to mercury disposal. The solid-state modules provide comparable or superior luminous flux with significantly improved reliability.
4Stability of the object's composition
If solid-state modules with significant spectral overlap are used, then color stability is improved, but luminous efficiency decreases
Solution Approach 1:
The patent accepts the luminous efficiency loss as an acceptable trade-off for achieving superior color stability and aging behavior. The significant spectral overlap between the two solid-state modules ensures consistent color output over time, and the system design optimizes the use of available luminous flux through proper optical coupling and light modulator illumination, effectively converting the apparent waste into beneficial color consistency.
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 approach results in a more stable and efficient illumination system with reduced servicing needs, higher luminous flux, and improved color consistency, suitable for large-scale projector applications, while eliminating the need for mercury-based lamps and reducing environmental impact.
Implementation Method 1
The first solid-state-based illumination module 4, 4' emits first luminescence radiation 10, 10' and the second solid-state-based illumination module 5, 5' emits second luminescence radiation 14, 14'
Data Source
AI summary
An illumination apparatus includes a first solid-state-based illumination module, a second solid-state-based illumination module, and a superposition unit, which couples first and the second luminescence radiation into an illumination beam path, in which said radiation is guided up to the end of the illumination beam path in order to illuminate a light modulator. A filter unit which filters light with a second color from the first luminescence radiation with a first color and from the second luminescence radiation such that light with the first and second color is present at the end of the illumination beam path.