Light Emitting Device with Vertical LED Array and Omnidirectional Emission
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Solution Overview
Problem
Conventional light emitting devices, particularly those using LEDs, are not suitable for broad light emission due to high directivity, which limits their application in lighting that requires illumination of a wide area, and they often suffer from light loss due to reflection members.
Innovation Solution
A light emitting device design featuring a transparent board with a non-smooth lower surface and metal plates that allow light to exit through all peripheral surfaces, including the bottom and sides, with a wavelength conversion member to enhance light output and reduce reflection, enabling broad light emission without the need for additional reflectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional LED light emitting devices are used, then electric power consumption efficiency is improved, but light emission coverage is limited due to high directivity
Solution Approach 1:
The patent transitions from conventional single-direction LED emission to multi-directional emission by arranging LEDs vertically on a board and enabling light to exit through all peripheral surfaces (top, bottom, and sides). This dimensional expansion allows the same energy-efficient LED technology to illuminate a much broader spatial area, resolving the contradiction between energy efficiency and coverage area.
2Area of stationary object
If reflectors are added to broaden light emission, then light coverage is improved, but device complexity and light loss increase
Solution Approach 1:
The patent removes the need for reflectors entirely by changing the fundamental light emission architecture. Instead of using LEDs that emit in one direction and requiring reflectors to redirect light, the invention uses vertically mounted LEDs on a board with light-exiting surfaces on all sides. This extraction of the reflector component simplifies the device structure while achieving broad light coverage through direct multi-directional emission.
3Area of stationary object
If reflectors are used to redirect light, then light coverage is improved, but light loss due to reflection increases
Solution Approach 1:
The patent eliminates the harmful effect of reflection losses by avoiding reflectors altogether. The design accepts and utilizes the natural omnidirectional emission characteristics of vertically mounted LEDs, allowing light to exit directly through all peripheral surfaces without undergoing reflective redirection. This converts what would be a loss mechanism (reflection) into a beneficial direct emission pathway.
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 design improves light-outgoing efficiency and reliability by allowing light to radiate uniformly in all directions, reducing the need for reflectors and enhancing heat dissipation, making it suitable for various lighting applications with reduced power consumption and maintenance.
Implementation Method 1
a wavelength conversion member (50) adapted to convert wavelength of light emitted from the light emitting elements
Data Source
AI summary
A light emitting device including a bulb having a side surface, a board elongated longer in a first direction than in a second direction perpendicular to the first direction, and a plurality of light emitting elements mounted on the board. Each of the plurality of light emitting elements has an upper surface and a lower surface opposite to the upper surface, where the lower surface is mounted on the board. The device includes a plurality of sets of metal plates and leads electrically connected to the plurality of light emitting elements, and a wavelength conversion member covering the light emitting elements and a portion of each of the metal plates. The board, the light emitting elements, the sets of metal plates and leads, and the wavelength conversion member are disposed in the bulb. The upper surface of each of the light emitting elements faces the side surface of the bulb.