Protruding Electrode Vehicle Lamp Semiconductor Light Source
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Solution Overview
Problem
Vehicle lamps using packaged LEDs face issues with low mass production yield rates, high costs, and insufficient light quantity due to short circuits caused by thermal expansion coefficient differences between semiconductor light-emitting devices and metal electrodes.
Innovation Solution
A vehicle lamp design featuring a light source unit with a base substrate, first and second electrodes, where the second electrode has protruding electrodes that penetrate a light transmitting layer to ensure a large contact area with semiconductor light-emitting devices, preventing short circuits and enabling stable high-current supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If packaged LEDs are used in vehicle lamps, then the lamp structure is simple and easy to manufacture, but the mass production yield rate is low and costs are high
Solution Approach 1:
The patent segments the LED system into two parts: using packaged LEDs for simple lamp structure while employing bare semiconductor light-emitting devices for high-yield mass production. This allows the benefits of both approaches to be realized in different contexts within the overall lighting system.
2Device complexity
If packaged LEDs are used in vehicle lamps, then the lamp structure is simple, but the light amount or quantity is insufficient for illumination
Solution Approach 1:
The patent merges packaged LEDs and bare semiconductor light-emitting devices in the same lighting system. The packaged LEDs provide structural simplicity while the bare semiconductor devices contribute to higher light output, achieving both ease of manufacture and sufficient illumination.
3Device complexity
If a small contact area is used between electrode and semiconductor light-emitting device, then the device complexity is reduced, but short circuits occur due to uneven thermal expansion
Solution Approach 1:
The patent transitions from a simple planar electrode contact to a three-dimensional structure with protruding electrodes that extend downward to contact the semiconductor light-emitting devices. This dimensional change increases the contact area and improves thermal expansion compatibility without significantly increasing overall device complexity.
4Ease of manufacture
If a small contact area is used between electrode and semiconductor light-emitting device, then the manufacturing is simpler, but high current cannot be supplied stably
Solution Approach 1:
The protruding electrodes extend in the vertical dimension to create a larger contact area with the semiconductor light-emitting devices. This enables stable high current supply while maintaining relatively simple manufacturing processes, as the protruding structure can be formed through standard electrode deposition techniques.
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 prevents short circuits and ensures a sufficient light output by providing a large contact area for even heat generation and maximum current supply to the semiconductor light-emitting devices, enhancing the lamp's performance and efficiency.
Implementation Method 1
a semiconductor light-emitting device of converting a current into light
Implementation Method 2
a light transmitting layer disposed between the semiconductor light-emitting devices and the second electrode
Implementation Method 3
the protruding electrodes may be in contact with the semiconductor light-emitting devices so as to be electrically connected
Data Source
AI summary
Discussed is a vehicle lamp using a semiconductor light-emitting device. The vehicle lamp includes a light source unit for emitting light. The light source unit includes a base substrate; a first electrode arranged on the base substrate; a plurality of semiconductor light-emitting devices arranged on the first electrode; and a second electrode arranged on upper sides of the semiconductor light-emitting devices and arranged so as to overlap with the semiconductor light-emitting devices, wherein the second electrode includes a plurality of protruding electrodes protruding toward a lower side of the second electrode, and the protruding electrodes can come in contact with the semiconductor light-emitting devices such that the protruding electrodes are electrically connected to the semiconductor light-emitting devices.