Projection Display System Wavelength Optimization
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Solution Overview
Problem
Existing projection display systems face challenges in balancing brightness and color gamut, with pure laser systems achieving high color gamut but low brightness, and laser-fluorescent systems achieving high brightness but limited color gamut.
Innovation Solution
A projection display system comprising a light source assembly, a wavelength adjusting assembly, and a modulation assembly, where the wavelength adjusting assembly adjusts the spectral composition of the projected light to enhance luminous efficacy while meeting preset color gamut requirements, and the modulation assembly modulates the light to form a projected image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pure laser light of RGB is used as the light source, then color gamut is improved (near-total color gamut), but brightness deteriorates (low luminous efficacy of red primary color light)
Solution Approach 1:
The patent adjusts the wavelength parameters of the laser light sources, specifically using red laser light with wavelength of 610-630nm, green laser light with wavelength of 520-540nm, and blue laser light with wavelength of 440-470nm. By optimizing these wavelength parameters, the system achieves a balance between color gamut coverage and luminous efficacy, resolving the contradiction between color quality and brightness
Solution Approach 2:
The patent combines multiple laser light sources (red, green, blue) with different luminous characteristics to create a composite light source system. This composite approach allows the system to achieve both high color gamut (near-total color gamut) and high brightness by leveraging the complementary strengths of different laser wavelengths
2Power
If laser light and fluorescent light are used as the light source, then brightness is improved (high brightness), but color gamut deteriorates (small color gamut)
Solution Approach 1:
The patent replaces traditional fluorescent light sources with laser light sources, which have longer operational life and higher efficiency. The laser-based system eliminates the need for fluorescent phosphors that limit color gamut, providing both sustained brightness and expanded color reproduction capability
3Loss of energy
If the ratio of luminous efficacy of projected light to luminous efficacy of monochromatic light is increased, then energy efficiency is improved, but color gamut coverage may deteriorate
Solution Approach 1:
The patent optimizes the spectral parameters of the laser light sources by selecting specific wavelength ranges (red: 610-630nm, green: 520-540nm, blue: 440-470nm) that simultaneously achieve high luminous efficacy ratio (>65% of monochromatic light efficacy) and adequate color gamut coverage (≥45% of Rec. 709 standard), resolving the energy efficiency versus color quality trade-off
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 system achieves a balance between brightness and color gamut by optimizing the luminous efficacy and color gamut coverage, allowing for high-brightness and vivid color reproduction.
Implementation Method 1
The wavelength adjusting assembly is disposed on an optical path of the projected light for adjusting spectrum of the projected light
Data Source
AI summary
A projection display system includes a light source assembly, a wavelength adjusting assembly, and a modulation assembly. The light source assembly is configured to emit projected light. The wavelength adjusting assembly is disposed on an optical path of the projected light for adjusting spectrum of the projected light, and a ratio of luminous efficacy of adjusted projected light to luminous efficacy of monochromatic light corresponding to a dominant wavelength of the projected light is greater than a preset ratio, and color gamut of the adjusted projected light satisfies a preset color gamut coverage. The modulation assembly is disposed on a light exiting path of the wavelength adjusting assembly and configured to modulate light emitted by the wavelength adjusting assembly and output corresponding image light to form projection image.