Omni-directional LED Light Source Design
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Solution Overview
Problem
Conventional LED devices are directional light emitters, limiting their application in general lighting and omni-directional lighting applications due to their inability to emit light in all directions.
Innovation Solution
An omni-directional LED device is designed with an LED chip that emits light from all surfaces, including the top, bottom, and sides, and is assembled in a casing that allows for 360-degree light emission, using a configuration where the anode and cathode contacts do not cover the entire surface area to facilitate light emission from multiple directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LED devices use a reflector cup or opaque substrate to direct light upward, then light emission directionality is improved, but omni-directional light emission is lost
Solution Approach 1:
The patent removes the reflector cup or opaque substrate that blocks bottom surface light emission. By extracting this directional control component, the LED device enables light to emit from all surfaces including the bottom, achieving omni-directional illumination while maintaining efficient light extraction from the LED chip.
Solution Approach 2:
The invention transitions from unidirectional (top-only) or hemispherical (top and sides) light emission to three-dimensional omni-directional light emission by allowing light to exit through all six surfaces of the LED chip (top, bottom, and four sides). This adds spatial dimensions to light distribution, enabling 360-degree illumination coverage.
2Reliability
If LED chip contacts cover the entire surface area for optimal electrical connection, then electrical reliability is improved, but light emission from surfaces is blocked
Solution Approach 1:
The patent applies local quality by making the contact areas selective rather than universal. The LED chip contacts are positioned to cover only specific regions necessary for electrical connection, leaving other areas open for light emission. This localized contact approach ensures adequate electrical reliability while maximizing light extraction surface area.
Solution Approach 2:
The invention segments the LED chip surface into distinct functional zones: contact areas for electrical connection and non-contact areas for light emission. By dividing the surface in this manner, the design optimizes both electrical performance (through adequate contact areas) and optical performance (through maximized light-emitting surfaces).
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 omni-directional LED device achieves a 360-degree beam pattern, increasing its applicability in general lighting and other applications requiring omnidirectional lighting, while also improving efficiency and heat dissipation through appropriate casing materials and terminal design.
Implementation Method 1
Light emitting diodes ('LEDs') are, in general, miniature semiconductors that employ a form of electroluminescence resulting from the electronic excitation of a semiconductor material, which produces visible light.
Implementation Method 2
Where the substrate is optically transparent, light generated in the P-N junction may exit the LED chip from all surfaces, i.e., top, bottom and four sides surfaces.
Data Source
AI summary
A light emitting diode (“LED”) device that emits omni-directional light is disclosed. Such omni-directional LED device may include a LED chip capable of emitting light in all directions. In one example of one implementation, the LED chip is then assembled and sealed inside a casing, such as a glass casing or tube that is capable of emitting light in 360 degree beam pattern. Further, the anode and cathode, or P or N-type contacts, may be configured on the LED chip such that light is allowed to emit from the top and/or the bottom surface of the LED chip in the LED device and is further able to reflect outward and fill the casing or tube of the LED device with light capable of emitting omni-directionally.