Illuminator Light Combiner for Compact Color Luminance Detection
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Solution Overview
Problem
Existing projectors face challenges in detecting the intensity of color light output from light sources, leading to variations in luminance and color balance, and require a compact and simplified configuration for luminance detection.
Innovation Solution
An illuminator with a first light source emitting blue light, a second light source emitting yellow light, a light combiner with a reflection film, and a light receiving sensor to detect both lights, allowing for compact luminance detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detection apparatus is disposed at each reflection mirror to detect luminance of blue and red light, then measurement precision of color light intensity is improved, but device complexity and size increase
Solution Approach 1:
The patent combines multiple detection functions into a single detection apparatus. Instead of having separate detection apparatuses at each reflection mirror, the invention uses one detection apparatus that can detect the luminance of both blue light and red light by utilizing the wavelength-dependent properties of a single reflection film, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The reflection film is designed to serve multiple functions: it reflects blue light to the detection apparatus while transmitting red light, and vice versa for different detection scenarios. This multi-functional design allows a single detection apparatus to perform multiple detection tasks that would traditionally require separate apparatuses at different locations.
2Measurement precision
If separate detection apparatuses are provided for blue and red light detection, then measurement precision is improved, but the size of the projector increases
Solution Approach 1:
The patent merges the detection functions for blue and red light into a single compact detection apparatus. By using a single reflection film with wavelength-dependent properties, the system achieves comprehensive luminance detection without requiring multiple separate detection apparatuses, thereby minimizing the increase in projector size while maintaining measurement precision.
3Device complexity
If a reflection film with specific wavelength-dependent properties is used, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes changes in optical parameters (wavelength-dependent reflectance and transmittance) of the reflection film to achieve the detection function. By carefully selecting and controlling the optical parameters of the reflection film material and its layer structure, the system achieves simplified configuration while maintaining the necessary manufacturing precision for optimal performance.
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 efficient detection of color light intensity while maintaining a compact projector design, ensuring consistent color balance and image quality.
Implementation Method 1
The reflection film has transmittance higher than reflectance in the first wavelength band (blue light), and the reflectance is higher than 0% in the first wavelength band. The reflection film has transmittance lower than the reflectance in the second wavelength band (yellow light), and the transmittance is higher than 0% in the second wavelength band.
Data Source
AI summary
An illuminator according to an embodiment of the present disclosure includes a first light source configured to output first light having a first wavelength band; a second light source configured to output second light having a second wavelength band different from the first wavelength band; a light combiner having a first surface and a second surface different from the first surface; and a light receiving sensor configured to receive the first light and the second light. The light combiner includes a substrate, and a reflection film layered on the substrate. The reflection film has transmittance higher than reflectance in the first wavelength band, and the reflectance is higher than 0% in the first wavelength band. The reflection film has transmittance lower than the reflectance in the second wavelength band, and the transmittance is higher than 0% in the second wavelength band. The first light is incident on the first surface, and the second light is incident on the second surface. The light receiving sensor is configured to receive the first light reflected off the first surface and the second light passing through the second surface.