Light Emitting Device Package With Inclined Cavity Wall
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Solution Overview
Problem
Current light emitting device packages face inefficiencies in light extraction, with light being confined or absorbed within the package rather than emitted externally, limiting their performance in applications such as display devices and lighting systems.
Innovation Solution
The design incorporates a substrate with a cavity having an inclined side wall and a reflective member, along with a light transmission unit positioned at an optimized distance from the light emitting device, to enhance light extraction efficiency by reflecting and transmitting light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional light emitting device package structure is used, then the device is simple to manufacture, but light extraction efficiency is poor with light being confined or absorbed within the package
Solution Approach 1:
The package structure is divided into distinct functional zones: a cavity region for light generation, an inclined side wall for light redirection, and a light transmission unit for external light emission. This segmentation allows each component to optimize its function while maintaining manufacturability through modular assembly processes.
Solution Approach 2:
The inclined side wall acts as an intermediary element between the light emitting device cavity and the external environment. It mediates light propagation by reflecting and redirecting light at optimized angles toward the light transmission unit, preventing light confinement while maintaining a straightforward manufacturing process.
2Loss of energy
If the light transmission unit is positioned too close to the light emitting device, then light extraction efficiency improves, but light output power decreases due to absorption and confinement effects
Solution Approach 1:
The design optimizes the distance parameter between the light emitting device and light transmission unit to achieve dynamic balance. This optimized spacing creates ideal light propagation paths that maximize extraction efficiency while preventing absorption and confinement losses, thereby maintaining high light output power.
Solution Approach 2:
The inclined side wall introduces angular dimensionality to light propagation. By redirecting light at optimized angles toward the light transmission unit, the design creates three-dimensional light paths that simultaneously improve extraction efficiency and maintain output power, resolving the contradiction between proximity and performance.
3Power
If the light transmission unit is positioned at an optimized distance, then light output power increases, but the device structure becomes more complex
Solution Approach 1:
Complexity is localized to specific critical elements: the inclined side wall geometry and the optimized spacing between components. The remainder of the package structure maintains simple, manufacturable forms. This selective application of complexity only where optically critical resolves the contradiction between enhanced light output and overall structural simplicity.
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 configuration significantly improves light output power by increasing light extraction efficiency, as demonstrated by test results showing increased light output with optimal distance settings between the light emitting device and the light transmission unit, thereby enhancing the package's performance in various applications.
Implementation Method 1
a substrate with a cavity having an inclined side wall and a reflective member
Implementation Method 2
a light transmission unit positioned at an optimized distance from the light emitting device, to enhance light extraction efficiency by reflecting and transmitting light effectively
Data Source
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AI summary
Disclosed is a light emitting device package (200A) which includes a substrate (210) having a cavity including a side wall and a bottom surface, a light emitting device (100) disposed in the cavity (212), a support unit (210, 260) including a first region, and a second region bent from the first region and disposed on the side wall of the cavity, and a light-transmitting unit (230) adhered to the first region such that the light-transmitting unit is spaced from the light emitting device (D), the light-transmitting unit (230) transmitting light emitted from the light emitting device (100), wherein a distance (D) between an upper surface of the light emitting device and the light transmission unit is 0.15 mm to 0.35 mm.