Driver Circuit Placement for LED Matrix Yield
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Solution Overview
Problem
Conventional display matrices with driver circuits arranged underneath light emitting structures face challenges in yield and testing due to increasing surface size, making it difficult to interconnect and test the driver circuits reliably.
Innovation Solution
A device and method where driver circuits are placed on one side of a substrate and load interfaces on the opposite side, allowing for vertical current flow and easier access for testing, improving the interconnect structure and yield by simplifying the connection of driver circuits with loads such as LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driver circuits are arranged underneath light emitting structures in a conventional display matrix, then the display can be operated, but the yield becomes insufficient and testing becomes difficult as the surface size increases
Solution Approach 1:
The patent inverts the conventional arrangement by placing driver circuits on the front side (first side) of the substrate rather than underneath the light emitting structures on the back side. This inversion makes the driver circuits directly accessible for testing while maintaining proper electrical connection to the light emitting structures through vertical current flow through the substrate.
Solution Approach 2:
The patent utilizes the vertical dimension (thickness) of the substrate to route current from the driver circuits on the first side through the substrate to the light emitting structures on the second side. This three-dimensional current path resolves the spatial conflict between driver circuit placement and light emitting structure arrangement.
2Quantity of substance
If the surface size of the display matrix is increased to provide large displays, then more light emitting structures can be accommodated, but the interconnection reliability and testing difficulty increase
Solution Approach 1:
By inverting the driver circuit placement to the front side, the patent reduces the horizontal interconnection distance and improves interconnection reliability. The driver circuits are now positioned closer to their corresponding light emitting structures, reducing the risk of interconnection failures even as the display matrix size increases.
3Device complexity
If driver circuits are placed underneath light emitting structures, then the display structure is compact, but the driver circuits become difficult to access for testing
Solution Approach 1:
The patent resolves the accessibility issue by inverting the driver circuit placement to the front side of the substrate. This maintains the compact structure while making the driver circuits directly accessible from the front side for testing, eliminating the need to access circuits from the back side or through the light emitting structures.
Data Source
AI summary
In various embodiments, a device is provided. The device includes a substrate having a first side and a second side opposite the first side. The substrate includes a plurality of driver circuits at the first side of the substrate. Each of the plurality of driver circuits is configured to drive a current from the first side of the substrate to the second side of the substrate. The device further includes at least one load interface at the second side of the substrate. The at least one load interface is configured to couple the current from the plurality of the driver circuits to a plurality of loads at the second side of the substrate.