Multi-Pixel LED Package With Shared Common Electrodes
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Solution Overview
Problem
Conventional multi-pixel LED packages face challenges in achieving high-resolution displays due to limited terminal pitches, complex circuit designs, and voltage deviations caused by densely packed electrodes and interconnection lines, which hinder the efficient control of individual LED pixels and increase fabrication costs.
Innovation Solution
The proposed multi-pixel LED package design reduces the number of terminals per pixel by using a substrate with individual electrodes connected to each LED chip, common electrodes for shared connections, and a matrix arrangement of connectors and power terminals, allowing for flexible circuit design and independent control of LED chips while minimizing voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If single-pixel LED packages with four terminals are used to achieve high resolution, then LED pitch can be reduced, but terminal pitch becomes excessively small causing short-circuiting and PCB design limitations
Solution Approach 1:
The invention divides the LED display into multiple pixel groups (first pixel group, second pixel group, etc.) where each group shares common power terminals. This segmentation allows reducing the number of terminals per pixel while maintaining individual control capability, thus resolving the terminal pitch problem while achieving high resolution
Solution Approach 2:
The common power terminals (first common power terminal, second common power terminal) serve multiple pixels within each pixel group simultaneously. This multi-functionality reduces the total terminal count and pitch requirements while maintaining the ability to control individual pixels through the shared terminal structure
2Ease of operation
If densely packed electrodes and interconnection lines are used to control individual LED pixels, then individual pixel control is achieved, but voltage deviations occur and fabrication costs increase
Solution Approach 1:
The invention segments the power distribution into multiple independent common power terminals, each serving a specific pixel group. This segmentation reduces the current density and voltage drops in each interconnection line, minimizing voltage deviations while maintaining individual pixel control capability
Solution Approach 2:
The common power terminals act as intermediaries between the power source and individual LED pixels. This intermediary structure provides stable voltage distribution to multiple pixels, reducing voltage fluctuations and improving reliability compared to direct individual connections
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 enables high-resolution displays with reduced terminal density, simplified circuit design, and reliable individual control of LED pixels, eliminating issues related to terminal pitch and voltage deviations, thereby enhancing display quality and reducing fabrication costs.
Implementation Method 1
Each of the pixels consists of red, green, and blue LEDs or red, green, blue, and white LEDs
Implementation Method 2
red, green, and blue LEDs are packaged and mounted on a substrate
Data Source
AI summary
A multi-pixel LED package is disclosed. The multi-pixel LED package includes: n pixel groups (where n is a natural number equal to or greater than 2), each of which includes a plurality of pixels, each of which includes a first LED chip, a second LED chip, and a third LED chip; and a substrate on which the n pixel groups are arrayed. The substrate includes first individual electrodes individually connected to first conductive electrodes of the first LED chips in the pixel groups, second individual electrodes individually connected to first conductive electrodes of the second LED chips in the pixel groups, third individual electrodes individually connected to first conductive electrodes of the third LED chips in the pixel groups, common electrodes connected in common to second conductive electrodes of the first LED chips, the second LED chips, and the third LED chips in the pixel groups, first connectors connected to all of the first individual electrodes in the pixel groups, second connectors connected to all of the second individual electrodes in the pixel groups, third connectors connected to all of the third individual electrodes in the pixel groups, fourth connectors individually connected to all of the common electrodes in the pixel groups, first power terminals individually connected to the first connectors, second power terminals individually connected to the second connectors, third power terminals individually connected to the third connectors, and fourth power terminals individually connected to the fourth connectors.