Wavelength Conversion Element for 3D Display Crosstalk
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Solution Overview
Problem
Existing image projection apparatuses face challenges in achieving good color purity and luminance with complex configurations, and existing wavelength conversion elements do not effectively separate and combine light spectra to prevent crosstalk in 3D displays.
Innovation Solution
A wavelength conversion element with multiple quantum dot layers and a diffusion layer, arranged in alternating regions on a reflective substrate, converts excitation light into distinct wavelength bands with specific peak intensities, allowing for the separation and combination of light spectra to achieve high color purity and luminance, and prevent crosstalk in 3D displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple fluorescent body layers are arranged in a circumferential direction to sequentially emit different color light, then color variety is achieved, but device complexity increases and color purity decreases due to spectral overlap
Solution Approach 1:
The invention divides the wavelength conversion function into multiple independent wavelength conversion regions (first region with first and third converters, second region with second and fourth converters) instead of using sequential fluorescent layers. Each region independently converts excitation light to specific wavelength bands, avoiding spectral overlap and crosstalk while maintaining color variety.
Solution Approach 2:
The invention transitions from a temporal/sequential arrangement (fluorescent layers emitting at different times) to a spatial/parallel arrangement (multiple wavelength conversion regions operating simultaneously with distinct wavelength bands). This dimensional change eliminates the need for complex sequential switching and achieves color separation through spatial distribution of wavelength conversion functions.
2Illumination intensity
If fluorescent layers are used to convert ultraviolet light to visible light, then color emission is achieved, but crosstalk occurs between different color channels reducing image quality
Solution Approach 1:
The invention assigns different wavelength conversion characteristics to different spatial regions. The first wavelength conversion region converts UV to blue light (peak 440-480nm), while the second region converts UV to green light (peak 500-560nm). This local differentiation of conversion properties prevents spectral overlap and crosstalk, ensuring high color purity in each channel.
Solution Approach 2:
The invention introduces a light separating element as an intermediary between the wavelength conversion element and the optical system. This element separates the light fluxes from different wavelength conversion regions, further preventing crosstalk and ensuring that blue and green light channels remain distinct, thereby maintaining high color purity.
3Device complexity
If a simple fluorescent body configuration is used, then device simplicity is maintained, but color purity and luminance are insufficient
Solution Approach 1:
The invention uses composite wavelength conversion materials including quantum dots, quantum rods, or fluorescent particles with specific emission characteristics. These composite materials provide sharp emission peaks and high quantum efficiency, achieving superior color purity and luminance while maintaining a relatively simple overall device structure with just two main regions.
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 enables the projection of high-quality images with good color purity and luminance, and effectively prevents crosstalk in 3D displays by ensuring distinct wavelength bands and peak intensities, enhancing the overall image quality and 3D effect.
Implementation Method 1
a first quantum dot layer configured to convert light from a light source into first light having a first wavelength band different from a wavelength band of the light from the light source, and a first peak intensity at a first wavelength
Implementation Method 2
a diffusion layer configured to diffuse light
Data Source
AI summary
A wavelength conversion element includes first to fourth wavelength converters configured to convert incident from a light source into first to fourth light fluxes having first to fourth wavelength band different from a wavelength band of the light from the light source and first to fourth peak intensities at first to fourth wavelengths. The first to fourth wavelengths satisfy predetermined conditions.