Light Emitting Unit With Holding Member For Wavelength Conversion
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Solution Overview
Problem
Existing methods for generating white light using LEDs struggle to produce uniform white light due to difficulties in stabilizing the synthesis of red, green, and blue light, and wavelength conversion methods for blue LED light have not been practically implemented.
Innovation Solution
A light emitting unit comprising a light source, an optical part with a light incident surface, a wavelength conversion member between the light source and the optical part, and a holding member to maintain a predetermined interval between the light source and the wavelength conversion member, preventing contact and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wavelength conversion member is placed close to the light source for efficient wavelength conversion, then light entrance efficiency is improved, but the risk of contact and breakage between the light source and wavelength conversion member increases
Solution Approach 1:
The patent introduces a holding member as an intermediary component between the light source and the wavelength conversion member. This holding member maintains a predetermined interval between the two components, preventing direct contact while still allowing efficient light transmission. The holding member acts as a mediator that resolves the contradiction by enabling close proximity for efficiency while preventing contact for reliability.
2Productivity
If the light source and wavelength conversion member are positioned close together, then wavelength conversion efficiency is improved, but the uniformity and stability of white light output deteriorates
Solution Approach 1:
The patent controls the distance parameter between the light source and wavelength conversion member by using the holding member to maintain a predetermined interval. This parameter control allows optimization of both conversion efficiency and light uniformity by preventing the components from being too close, which would cause instability in white light output.
3Device complexity
If no holding member is used to simplify the device structure, then device complexity is reduced, but the reliability and practical usability deteriorate due to contact and breakage risks
Solution Approach 1:
The holding member serves as a preventive measure that is built into the device structure beforehand to prevent potential contact and breakage between the light source and wavelength conversion member. This prior cushioning approach ensures reliability without requiring complex active control systems, maintaining reasonable structural simplicity while preventing failures.
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 allows for stable and uniform light emission by preventing contact between the light source and wavelength conversion member, improving reliability and light entrance efficiency, enabling practical use in displays and lighting apparatus.
Implementation Method 1
wavelength conversion of LED light of single color, for example, blue color, is performed with use of fluorescent pigment or fluorescent dye
Data Source
AI summary
There are provided a light emitting unit using a wavelength conversion member which may be put to practical use, and a display and a lighting apparatus which include the light emitting unit. The light emitting unit includes: a light source; an optical part including a light incident surface, the light incident surface facing the light source; a wavelength conversion member provided between the light source and the light incident surface; and a holding member holding the wavelength conversion member at a position between the light source and the light incident surface of the optical part.