Light Source Device Using Segmented Luminous Flux for Uniform Projection
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Solution Overview
Problem
Existing projection display apparatuses face challenges in maintaining high uniformity and luminance with a wide color gamut, especially when the numbers and sizes of semiconductor lasers differ among red, green, and blue light sources.
Innovation Solution
A light source device configuration using solid-state red, green, and blue light sources, a dichroic mirror for combining colors, a dynamic diffusion plate, and a luminous-flux splitting element, such as a prism array, to equalize the luminous flux sizes and numbers of semiconductor lasers, ensuring uniform image projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the numbers of semiconductor lasers are different among colors (red, green, blue), then the device complexity is reduced, but the uniformity of projection images deteriorates
Solution Approach 1:
The invention divides the luminous flux from each color light source into multiple segments using luminous flux splitting elements (prisms). Specifically, the blue light luminous flux is split into three separate fluxes, the green light luminous flux is split into two fluxes, and the red light luminous flux is split into one flux. This segmentation allows the system to use different numbers of semiconductor lasers for each color while maintaining uniform overall luminous flux distribution, thereby resolving the contradiction between device complexity and image uniformity.
2Device complexity
If the sizes of luminous fluxes are different among colors, then the device configuration is simplified, but the uniformity of projection images decreases
Solution Approach 1:
The invention applies segmentation by dividing the luminous flux from each color source into multiple smaller fluxes using prism arrays. The blue luminous flux is divided into three, green into two, and red into one, creating multiple uniform fluxes that can be evenly distributed. This resolves the contradiction by allowing simplified device configuration while achieving uniform projection images through the segmented flux distribution.
Solution Approach 2:
The invention changes the parameter of luminous flux distribution by using different splitting ratios for different colors. The blue light is split into 3 fluxes, green into 2 fluxes, and red into 1 flux, optimizing the parameters to achieve uniform overall distribution. This parameter optimization resolves the contradiction between simplified configuration and image uniformity.
3Adaptability or versatility
If solid-state light sources with different colors are used, then the color gamut is widened, but the uniformity of projection images deteriorates due to different luminous flux characteristics
Solution Approach 1:
The invention uses segmentation to divide the luminous flux from each color solid-state light source into multiple uniform fluxes. By splitting blue light into three fluxes, green into two, and red into one, the system maintains uniform overall distribution while preserving the wide color gamut provided by different colored solid-state sources, thereby resolving the contradiction.
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 achieves a small-size, high-luminance projection display apparatus with a wide color gamut, eliminating unevenness in image projection attributed to the number and size differences of semiconductor lasers.
Implementation Method 1
a dichroic mirror that combines, into combined light, the red light, the green light, and the blue light having exited from the respective solid-state light sources
Implementation Method 2
a dynamic diffusion plate on which the combined light having exited from the dichroic mirror is incident
Implementation Method 3
a luminous-flux splitting element that splits the luminous flux that having exited from the solid-state light sources for emitting at least one of the red light, the green light, and the blue light
Data Source
AI summary
The light source device according to the present disclosure includes: a solid-state light source that emits red light having a luminous flux; a solid-state light source that emits green light having a luminous flux; a solid-state light source that emits blue light having a luminous flux; a dichroic mirror that combines, into combined light, the red light, the green light, and the blue light having exited from the respective solid-state light sources; a dynamic diffusion plate on which the combined light having exited from the dichroic mirror is incident; and a luminous-flux splitting element that splits the luminous flux that having exited from the solid-state light sources for emitting at least one of the red light, the green light, and the blue light.