Reflective Layer for LED Light Extraction and Electrical Connection
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Solution Overview
Problem
Conventional light emitting diodes (LEDs) have lower light emitting efficiency at the bridging portions due to the use of transparent conductive materials for internal connection circuits, which only provide electrical connection without significant reflection, leading to inefficient light emission.
Innovation Solution
A light emitting device with a substrate, light emitting units, an insulation layer, a current distribution layer, and a reflective layer, where the reflective layer covers the current distribution layer and electrically connects adjacent light emitting diodes, enhancing light reflection and efficiency by using materials like silver, titanium, or alloys for high reflective efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transparent conductive materials are used for internal connection circuits, then electrical connection is provided, but light emitting efficiency is reduced at the bridging portion
Solution Approach 1:
The patent merges the electrical connection function and light reflection function into a single reflective layer. This layer simultaneously serves as the internal connection circuit for electrical conduction and as a reflective surface to redirect light, eliminating the need for separate transparent conductive materials that would compromise light efficiency.
Solution Approach 2:
The reflective layer is designed to perform multiple functions: it provides electrical connection between adjacent light emitting diodes, reflects light to improve emission efficiency, and serves as part of the internal connection circuit structure. This multi-functionality resolves the contradiction by making the connection structure itself light-efficient.
2Use of energy by moving object
If conventional AC-DC converters and voltage transformers are used, then direct current is provided for light emitting diodes, but energy consumption increases
Solution Approach 1:
The patent changes the electrical parameter capability of the light emitting diode itself by integrating internal connection circuits that enable it to operate with alternating current or high voltage directly, eliminating the need for external AC-DC converters and voltage transformers, thereby reducing energy loss in the power conversion process.
3Adaptability or versatility
If internal connection circuits are made on a miniature-sized single chip, then voltage and current adjustment ability is achieved, but light reflection effect is insufficient at bridging portions
Solution Approach 1:
The patent combines the internal connection circuit traces with a reflective layer structure, so that the same physical structure that provides electrical connection and voltage/current adjustment also provides enhanced light reflection at the bridging portions between adjacent diodes.
Solution Approach 2:
The reflective layer may be constructed using composite material structures that provide both electrical conductivity for connection purposes and high reflectivity for light emission, such as metal layers or dielectric mirror structures integrated into the chip's internal circuitry.
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 solution significantly improves light emitting efficiency by reflecting beams from the light emitting layers, outperforming conventional high voltage LEDs with transparent conductive materials, resulting in better overall light output.
Implementation Method 1
the reflective layer covers the current distribution layer, and electrically connects to the first light emitting diode and the second light emitting diode
Data Source
AI summary
A light emitting device includes a substrate, light emitting units, an insulation layer, a current distribution layer and a reflective layer. The substrate has an upper surface. The light emitting units are disposed on the upper surface and include at least one first light emitting diode (LED) and at least one second LED. A first side wall of the first LED is adjacent to a second side wall of the second LED so as to define a concave portion exposing a portion of the upper surface. The insulation layer at least covers the first side wall and the second side wall. The current distribution layer covers the concave portion and at least covers a portion of the second LED. The reflective layer covers the current distribution layer and is electrically connected to the first LED and the second LED.