LED Wire Grid Polarizer for Current Spreading Uniformity
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Solution Overview
Problem
Conventional LED packages face challenges in achieving even light emission and efficient current spreading, which affects the illumination characteristics and efficiency of solid-state lighting devices.
Innovation Solution
A wire grid polarization structure is integrated into the LED package, configured to polarize light emitted by the LED chip and spread current evenly across the LED chip's surface, thereby enhancing light emission uniformity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional LED packages are used without additional structures, then the device complexity is low, but the light emission uniformity and current spreading are poor
Solution Approach 1:
The wire grid polarization structure is designed to perform multiple functions simultaneously: it polarizes light emitted by the LED chip and also acts as a current spreading layer to distribute current evenly across the chip surface. This multi-functionality resolves the technical contradiction by improving light emission uniformity without requiring separate additional structures for current spreading, thus limiting the increase in device complexity.
Solution Approach 2:
The patent combines the polarization function and current spreading function into a single integrated wire grid structure. By merging these two functions that were traditionally performed by separate components, the design achieves improved light emission uniformity while minimizing the increase in structural complexity.
2Illumination intensity
If a wire grid polarization structure is added to polarize light, then the light polarization quality is improved, but the device complexity increases
Solution Approach 1:
The wire grid structure serves dual purposes: it provides the necessary light polarization quality improvement while simultaneously functioning as a current spreading layer. This multi-functionality justifies the added structural element by delivering multiple benefits from a single component, thereby limiting the net increase in device complexity.
3Manufacturing precision
If current is delivered to a single point on the LED chip, then the electrode design is simple, but the current spreading is poor and light emission is uneven
Solution Approach 1:
The wire grid polarization structure also serves as a current spreading layer with multiple electrical contacts distributed across the chip surface. This multi-functional design improves current spreading uniformity without requiring a completely separate and complex electrode system, as the same structural element performs both polarization and current distribution functions.
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
The wire grid polarization structure effectively polarizes light and spreads current evenly, resulting in improved light emission uniformity and efficiency across the LED chip, addressing the limitations of conventional LED packages.
Implementation Method 1
the wire grid polarization structure is configured so that unpolarized light generated by the LED chip is received by the wire grid polarization structure and polarized light exits the wire grid polarization structure
Implementation Method 2
The wire grid polarization structure can be formed on a top surface of the LED chip, and be electrically coupled to an electrode to spread the current across the top surface of the LED chip
Data Source
AI summary
Solid-state lighting devices, and more particularly, wire grid polarization structure for current spreading and polarization control for light emitting diode (LED) package, and a method for making the same are disclosed. The wire grid polarization structure can be configured to both polarize light emitted by an LED chip of the LED package as well as spread current on a layer of the LED chip, resulting in more even light emission across the LED chip. The wire grid polarization structure can be formed on a top surface of the LED chip, and be electrically coupled to an electrode to spread the current across the top surface of the LED chip. In an embodiment, the wire grid polarization structure can include interdigitated fingers that are coupled to both an anode and an electrode.