Intersecting Blue Light Source Apparatus for Compact Projection Displays
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Solution Overview
Problem
Current light source apparatuses for projection displays are not miniaturized effectively, as they rely on large configurations of solid state light sources that require complex optical paths and components, limiting their compactness and simplicity.
Innovation Solution
A light source apparatus comprising a first and second light source unit emitting blue lights in intersecting directions, with a split/combining optical element that splits and combines these lights into separate optical paths, allowing for efficient excitation and emission light utilization, thereby miniaturizing the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solid state light source arrays are used in a pair configuration facing each other, then light combining and projection functionality is achieved, but the apparatus size becomes large and complex
Solution Approach 1:
The patent combines multiple light source units (first and second blue light source units, third green light source unit, fourth red light source unit) and their corresponding optical systems into a single integrated light source apparatus. The optical element performs multiple functions: splitting blue light into excitation and image light paths, and combining all color light paths (blue, green, red) into a single projection path. This merging of functions and components achieves miniaturization while maintaining projection functionality.
2Adaptability or versatility
If blue light is split into excitation light and image light paths, then both phosphor excitation and direct blue light projection are enabled, but optical path complexity increases
Solution Approach 1:
The optical element serves multiple functions simultaneously: it acts as a beam splitter for blue light (separating excitation and image light), as a combiner for multiple color light paths (blue, green, red), and as a light guiding element. This multi-functionality enables the system to achieve versatile light utilization (both phosphor excitation and direct blue projection) without proportionally increasing optical path complexity.
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
This configuration enables a compact and simplified light source apparatus that effectively splits blue lights for both excitation and image light generation, enhancing the brightness and miniaturization of projection display systems while maintaining high performance.
Implementation Method 1
a light emitting body which is provided on the first optical path and emits an emission light in response to an excitation light
Data Source
AI summary
A light source apparatus according to the present disclosure includes: a first light source unit which emits a blue light in a first direction; a second light source unit which emits a blue light in a second direction which intersects with the first direction; a split/combining optical element which splits the blue lights emitted from the first light source unit and the second light source unit, into a first optical path and a second optical path; a light emitting body which is provided on the first optical path and emits an emission light in response to an excitation light; and a combining optical element which combines the first optical path and the second optical path into one optical path.