Dual LED Board Layout for Homogeneous Lighting
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Solution Overview
Problem
Current LED lighting systems face challenges in accommodating different types of LEDs from various manufacturers due to unique structural configurations and contact arrangements, making it difficult to design circuit boards that can support multiple types of LEDs without redesigning the board, and achieving homogeneous light output.
Innovation Solution
A circuit board layout with identical LED landing zones featuring multiple sets of contact pads configured to accommodate different structural types of LEDs, allowing for flexible use of various LED types without re-designing the board, and incorporating an optical integrating cavity for light mixing to achieve uniform light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the circuit board is designed to match one specific LED configuration, then the electrical connections and mounting are optimized for that LED type, but the board cannot accommodate different types of LEDs without redesign
Solution Approach 1:
The circuit board landing zones are designed with multiple sets of contact pads that can accommodate different LED types (e.g., 3-pin and 4-pin LEDs) using the same board layout. Each landing zone includes alternative contact pad arrangements that can be selectively used depending on which LED type is installed, making the board universally compatible with multiple LED configurations without requiring redesign
Solution Approach 2:
Different landing zones on the same circuit board are configured with different contact pad arrangements tailored to specific LED types. For example, some landing zones have 3 contact pads optimized for 3-pin LEDs while other landing zones have 4 contact pads optimized for 4-pin LEDs, allowing each local area to be optimized for its specific LED type while maintaining overall board compatibility
2Illumination intensity
If LEDs are arranged in a tight matrix array to maximize light output, then the lighting density is improved, but the light output appears non-homogeneous due to point source characteristics
Solution Approach 1:
An optical integrating cavity is introduced as an intermediary element between the LED array and the illuminated space. This cavity receives light from multiple point source LEDs and redistributes it through multiple reflections and scattering events, transforming the non-homogeneous point source output into homogeneous diffuse light that uniformly illuminates the target area
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
Enables the use of multiple LED types on a single board, enhancing flexibility in LED selection and ensuring homogeneous light distribution across illuminated areas by effectively mixing light from different LEDs, thus improving the overall lighting system's performance and adaptability.
Implementation Method 1
incorporating an optical integrating cavity for light mixing to achieve uniform light output
Data Source
AI summary
Circuit boards for lighting systems have identical LED landing zones printed on the board. Each zone includes at least two sets of LED contact pads. One pad set is configured to mate with contacts of an LED of a first structural type, e.g. from a first product line or manufacturer. The other pad set is configured to mate with contacts of an LED of a second type, e.g. from a different product line or manufacturer. The layout may enable an easy system re-design, e.g. to shift from one type of LED to another. Alternatively, the layout may enable one system to use LEDs of the two different types in a single LED set or array. Exemplary systems disclosed herein include an element for mixing light produced by LEDs mounted to the landing zones, such as an optical integrating cavity.