Circuit Board Protection for Light Emitting Devices
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Solution Overview
Problem
Conventional circuit boards with light emitting devices suffer damage due to heat-induced expansion of the light guide plate, leading to frequent contact and potential damage to the light emitting devices.
Innovation Solution
A circuit board design featuring a device protection portion with a protruding form that surrounds the light emitting devices, formed in various shapes such as straight, curved, circular, or polygonal shapes, and includes a binding portion for stable attachment to the support substrate, with a protective layer of resin or non-conductive materials to prevent contact with the light guide plate and reduce thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light guide plate is used to guide light from light emitting devices, then light diffusion and illumination are improved, but the light guide plate expands due to heat and contacts with light emitting devices causing damage
Solution Approach 1:
The patent introduces a protrusion structure on the circuit board that acts as an intermediary barrier between the light guide plate and light emitting devices. This protrusion prevents direct contact while allowing the light guide plate to function, thus resolving the contradiction between light diffusion and device protection.
Solution Approach 2:
The circuit board is segmented into different regions with varying heights, creating a stepped structure. The protrusion area is separated from the light emitting device mounting area, allowing independent positioning and protection of sensitive components while maintaining overall board functionality.
2Reliability
If the device protection portion protrudes to prevent contact with light guide plate, then light emitting devices are protected, but the structure becomes more complex
Solution Approach 1:
The protection function is merged into the circuit board itself by forming protrusions during the board manufacturing process. This integrates the protective feature with the existing circuit board structure, avoiding the need for separate protective components and reducing overall system complexity.
Solution Approach 2:
The circuit board utilizes variations in thickness/height as a design parameter to create the protrusion structure. By changing the geometric parameter (board height) rather than adding new components, the protection mechanism is achieved with minimal increase in structural complexity.
3Reliability
If the device protection portion is coated with resin or non-conductive material to reduce thermal expansion, then protection effectiveness is improved, but manufacturing steps increase
Solution Approach 1:
The protrusion structure serves multiple functions: mechanical protection against contact, thermal isolation through material coating, and potential electrical insulation. By making the protrusion multi-functional, the need for separate protective components is eliminated, actually simplifying the overall manufacturing process despite the coating step.
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
Effectively protects light emitting devices by preventing contact with the light guide plate and reducing thermal expansion, ensuring the devices remain stable and functional even when heat is generated.
Implementation Method 1
enabling expansion of a device protection portion caused by a light guide plate to be reduced by coating one surface of the device protection portion with at least one material of a resin material, a non-conductive material and a material having lower conductivity than that of the support substrate
Data Source
AI summary
Provided is a circuit board including: a support substrate; a plurality of light emitting devices mounted on the support substrate; and a device protection portion surrounding one of the light emitting devices, or three or more surfaces of the plurality of light emitting devices.