LED Light Emitting Device with Staggered Connection Wires
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Solution Overview
Problem
Conventional light-emitting devices with LEDs arranged in a zigzag fashion face issues with current crowding and reduced reliability due to potential disconnection of air bridge lines, limiting design freedom and optical extraction efficiency.
Innovation Solution
A light-emitting device with LEDs arranged in a line between electrode pads, connected by multiple staggered and gradually spaced connection wires, ensuring uniform light distribution and enhanced reliability even if one connection wire is disconnected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LEDs are arranged in a zigzag fashion with air bridge lines, then design freedom is improved, but current crowding occurs and reliability is reduced
Solution Approach 1:
The patent divides the connection structure into multiple parallel air bridge lines instead of using a single line. Each air bridge line independently connects adjacent LED chips, creating redundant pathways for current flow. This segmentation approach maintains design flexibility while eliminating current crowding and improving reliability through redundancy.
Solution Approach 2:
The patent applies different connection configurations to different regions of the device. Multiple air bridge lines are strategically positioned at specific locations between LED chips, creating localized current distribution pathways. This allows optimal current flow in critical regions while maintaining overall design freedom.
2Device complexity
If a single air bridge line connects adjacent LEDs, then device complexity is reduced, but reliability is reduced due to potential disconnection
Solution Approach 1:
The patent incorporates multiple air bridge lines as a preventive measure before any disconnection can occur. By providing redundant connection pathways in advance, the system cushions against potential failures of individual air bridge lines, ensuring continuous operation even if one line becomes disconnected.
Solution Approach 2:
The patent changes the connection parameter from a single air bridge line to multiple parallel lines. This parameter change increases the system's fault tolerance without significantly increasing overall device complexity, as the additional lines follow similar structural patterns.
3Reliability
If LEDs are arranged in a line configuration, then current distribution is improved, but optical extraction efficiency may be limited
Solution Approach 1:
The patent enhances the line configuration by adding multiple air bridge lines in the vertical dimension (stacking connections in parallel), rather than changing the horizontal LED arrangement. This dimensional addition improves current distribution without compromising the optical extraction properties of the LED chips themselves.
Data Source
AI summary
A light-emitting device includes a substrate, first and second electrode pads, first to M-th light-emitting cells arranged in a line in a first direction between the first and second electrode pads, and first to N-th connection wires for electrically connecting the first to M-th light-emitting cells, wherein each of the first to M-th light-emitting cells comprises a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer, wherein the first electrode pad is connected to the second conductive semiconductor layer of the first light-emitting cell while the second electrode pad is connected to the first conductive semiconductor layer of the M-th light-emitting cell, and an n-th connection wire electrically connects the first conductive semiconductor layer of an n-th light-emitting cell to the second conductive semiconductor layer of an (n+1)-th light-emitting cell, which are adjacent to each other.