SLED Display Light Source for High Efficiency and Long Lifetime
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Solution Overview
Problem
Current display systems face challenges with low overall power efficiency, limited lifetime, and high cost of light sources, particularly in projection systems, due to the inefficiencies in coupling between light sources and modulating units, and the need for complex optical systems to manage speckle and polarization issues.
Innovation Solution
The use of superluminescent light emitting diodes (SLEDs) as a light source in conjunction with a light modulating device and projection optics, allowing for efficient energy conversion and extended lifetime, while eliminating the need for beam splitters and polarizers through time-division multiplexing or multiple light modulating units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If broadband light sources like xenon lamps are used to achieve large color gamut, then the color coverage is improved, but the overall power efficiency deteriorates due to filtering losses and poor coupling efficiency
Solution Approach 1:
The broadband spectrum is segmented into multiple discrete wavelength bands, each generated by a separate laser diode. This eliminates the need for filtering broadband light and achieves high power efficiency while maintaining broad color gamut coverage through selective wavelength generation.
Solution Approach 2:
The invention changes the spectral parameter from continuous broadband to discrete narrowband wavelengths. By using multiple laser diodes with specific wavelengths (e.g., 450nm blue, 532nm green, 635nm red), the system achieves both high efficiency and broad color gamut.
2Power
If arc lamps are used as light sources to achieve high power output, then the intensity on panel is improved, but the lifetime and reliability deteriorate
Solution Approach 1:
The invention replaces the thermal arc discharge mechanism with a semiconductor electroluminescence mechanism. Laser diodes convert electrical energy directly to light with minimal heat generation, eliminating the thermal stress and degradation issues inherent in arc lamps, thereby achieving both high power output and extended lifetime.
3Manufacturing precision
If polarization-dependent modulating units are used to control light intensity, then the image quality is improved, but the energy efficiency deteriorates due to significant energy loss in polarizers
Solution Approach 1:
The invention extracts and eliminates the polarizer component from the optical system. By using intensity modulation directly on the laser diodes themselves, the system achieves precise image control without the 50% energy loss inherent in polarizer-based systems.
Solution Approach 2:
The laser diodes perform their own intensity modulation through direct current control, eliminating the need for separate polarizing components. This self-modulation capability achieves both high image quality and high energy efficiency.
4Stability of the object's composition
If complex optical systems with beam splitters and polarizers are used to manage speckle and polarization, then the image uniformity is improved, but the device complexity and energy loss increase
Solution Approach 1:
The invention extracts and removes beam splitters, polarizers, and other complex optical components from the system. By using multiple laser diodes with inherently stable emission characteristics and direct intensity modulation, the system achieves image uniformity without requiring complex optical path management.
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 enhances the reliability and efficiency of display systems by providing a broad gamut light source with improved lifetime and reduced form factor, minimizing residual heat and speckle issues, and increasing overall energy conversion efficiency.
Implementation Method 1
at least one superluminescent light emitting diode (SLED)... providing a broad gamut light source with improved lifetime and reduced form factor
Implementation Method 2
superluminescent light emitting diodes (SLEDs) as a light source... enhancing the reliability and efficiency of display systems
Implementation Method 3
at least one light modulating device arranged in a beam path of a light beam emitted by said light source and operable to emit influenced light upon incidence of said light beam
Implementation Method 4
projection optics arranged in a beam path of said influenced light
Data Source
AI summary
In accordance with the invention, a display apparatus comprising a light source is provided, said light source comprising at least one superluminescent light emitting diode (SLED), the apparatus further comprising at least one light modulating device arranged in a beam path of a light beam emitted by said light source and operable to emit influenced light upon incidence of said light beam, the light modulating device being operatively connected to an electronic control, the display apparatus further comprising a projection optics arranged in a beam path of said influenced light.