Light Path Switch Member for Projector Color Gamut
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Solution Overview
Problem
Projectors using blue laser light for excitation result in dark color images due to low human visual sensitivity to blue light, limiting the adjustability of color reproduction range.
Innovation Solution
A light source device with a light path switch member featuring different reflective and transmissive areas, allowing for adjustable mixing of blue laser light with fluorescence of other color components, enhancing color reproduction range by varying reflectance and transmittance indexes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If blue laser light is used as excitation light for fluorescent member, then high energy emission is achieved, but the color image on screen looks dark due to low human visual sensitivity to blue light
Solution Approach 1:
The light path switch member is configured to dynamically switch between different light paths, enabling the system to alternate between using blue laser light for excitation and using the generated fluorescence for projection. This dynamic switching allows the system to leverage the high energy of blue laser while presenting brighter colors to the human eye through the fluorescence conversion.
Solution Approach 2:
The invention changes the wavelength parameter of the projection light by converting blue laser light into fluorescence with different wavelengths (red, green, yellow components). This parameter transformation allows the system to maintain high energy input while outputting light in wavelength ranges to which human eyes are more sensitive, thereby improving perceived brightness and color quality.
2Productivity
If blue laser light is used as excitation light, then efficient fluorescence generation is achieved, but the color reproduction range is limited and not adjustable
Solution Approach 1:
The light path switch member enables dynamic control over the mixing ratio of blue laser light and fluorescence components in the projection light. By adjusting the switching timing and duration, the system can dynamically modify the color reproduction range and characteristics, providing adaptability while maintaining efficient fluorescence generation.
Solution Approach 2:
The system is designed to perform multiple functions with the same blue laser excitation source: it can generate fluorescence for color projection, directly project blue laser light, and mix both in various proportions. This multi-functionality allows the single blue laser source to provide both efficient fluorescence generation and adjustable color reproduction capabilities.
3Quantity of substance
If all blue laser light is transmitted to the fluorescent member, then maximum fluorescence output is achieved, but the projection light lacks color adjustability
Solution Approach 1:
The invention segments the blue laser light into two separate paths: one path directs light to the fluorescent member for fluorescence generation, while the other path allows direct transmission of blue laser light. The light path switch member controls the proportion of light distributed to each path, enabling independent optimization of fluorescence output quantity and color adjustability.
Solution Approach 2:
The light path switch member acts as an intermediary device that mediates between the blue laser light source and the two possible destinations (fluorescent member and projection screen). It controls the distribution and mixing of light, allowing the system to achieve both maximum fluorescence output and color adjustability by regulating the proportion of light sent to each path.
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 brighter and more adjustable color projection by mixing blue light with yellow fluorescence, improving visual sensitivity and color gamut, thus overcoming the limitations of traditional blue laser-based projectors.
Implementation Method 1
a fluorescent member configured to generate fluorescence by being excited by the blue light
Implementation Method 2
a light path switch member configured to switch a light path between an excitation light path for delivering the blue light as excitation light to the fluorescent member and a projection light path for delivering the blue light as projection light
Data Source
Figure 1
Figure 2~3
Figure 4(A)~4(D)
AI summary
A light source device of the present invention includes: an excitation light source (1a) configured to emit irradiation light of a color component to be used as excitation light and projection light; a fluorescent member (5) disposed in an excitation light path (X2) and configured to generate fluorescence of a color component different from the color component of the irradiation light when being irradiated with the irradiation light; a light path merger unit configured to merge a fluorescence light path (X3) through which the fluorescence generated with irradiation of the irradiation light is delivered, and a projection light path (X1) through which the projection light is delivered; and a light path switch disk (3) configured to switch the irradiation light between the excitation light path (X2) and the projection light path (X1).