Light Source Covering Layout for Compact Surge Protection
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Solution Overview
Problem
Existing light emitting devices with protection circuits are bulky due to the size requirements for protection elements, which hinders their miniaturization and integration in compact applications such as in-vehicle lighting systems.
Innovation Solution
A light emitting device design featuring a substrate with a drive circuit and a protection circuit connected in parallel, where the protection circuit includes two protection elements with reversed polarities, and a covering member that encases both the light source and protection elements, allowing for a compact configuration by integrating the protection elements within the covering member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protection circuits with protection elements are connected in parallel to light emitting elements, then the light emitting elements are protected from excessive voltage surges, but the size of the light emitting device increases
Solution Approach 1:
The patent combines the protection elements with the light source assembly by positioning them within the covering member that surrounds the light source. This integration allows the protection circuit to share the same spatial envelope as the light source, eliminating the need for separate protection circuit board areas and reducing the overall device footprint.
Solution Approach 2:
The protection elements are nested within the covering member structure that already surrounds the light source. By placing the protection elements inside the existing covering member volume rather than adding external protection circuit boards, the patent achieves compact integration without increasing the overall device dimensions.
2Area of stationary object
If protection elements are integrated within the covering member, then the device size is reduced, but the protection elements may be exposed to light
Solution Approach 1:
The patent applies different optical properties to different regions within the covering member. The covering member is configured to be light-transmissive in regions where light emission is desired while being light-shielding in regions where protection elements are located, creating localized optical characteristics that satisfy both light emission and protection element protection requirements.
Solution Approach 2:
The covering member is segmented into different functional regions: light-transmissive regions for light source operation and light-shielding regions for protection element protection. This spatial segmentation allows the single covering member structure to simultaneously fulfill multiple optical functions without requiring separate components.
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
This design reduces the overall size of the light emitting device while effectively protecting the drive circuit and light emitting elements from excessive voltage surges, maintaining performance in compact form factors suitable for automotive applications.
Implementation Method 1
the protection circuit includes two protection elements that are connected in series with reversed polarities
Data Source
AI summary
A light emitting device includes: a substrate having a first surface; a light source disposed on the first surface; a covering member disposed on the first surface and surrounding the light source in a plan view; and a circuit disposed on the substrate. The circuit includes a drive circuit, and a protection circuit that is connected in parallel to the drive circuit. The drive circuit is configured to drive the light source, and the protection circuit includes first and second protection elements that are connected in series with reversed polarities. The covering member covers the first and second protection elements.