Driving Circuit Board Layout With Dummy Electrodes for Micro-LED Alignment
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Solution Overview
Problem
The existing methods for transferring micro-LEDs to driving circuit boards are inefficient, especially for large-area display devices, leading to increased time and costs due to alignment errors and the need for multiple transfer processes, which can result in degraded performance if pad electrodes and driving electrodes are not properly connected.
Innovation Solution
A driving circuit board design with symmetrically arranged driving electrode regions, including dummy electrodes not connected to the driving circuit, allows for efficient connection of pad electrodes from micro-LEDs, enabling independent electrical signaling despite initial misalignment, by using a method that involves preparing substrates with grooves and aligning light-emitting devices within these grooves for bonding with the driving electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If micro-LEDs are transferred to a driving circuit board using conventional methods, then the display device can be manufactured, but alignment errors occur between pad electrodes and driving electrodes, degrading device performance
Solution Approach 1:
The patent changes the geometric parameters of the driving electrodes by adding dummy electrodes that extend beyond the active electrode regions. This parameter modification creates overlapping areas that can accommodate alignment variations during the transfer process, ensuring reliable electrical connections even when precision is limited.
Solution Approach 2:
The patent implements a cushioning strategy by designing dummy electrodes that serve as a buffer zone. These additional electrode structures are positioned to compensate for potential misalignment, providing a margin of error that protects against connection failures before they occur during assembly.
2Area of stationary object
If the area of the display device is increased, then the display size is improved, but the transfer process becomes more complex and time-consuming
Solution Approach 1:
The patent segments the driving circuit board into multiple regions, each with its own driving electrodes and dummy electrodes. This segmentation allows for modular assembly and transfer processes, making it easier to handle large-area displays by dividing them into manageable sections that can be transferred and connected systematically.
3Adaptability or versatility
If multiple transfer processes are used for micro-LEDs emitting multiple colors, then all color channels can be transferred, but the manufacturing time increases significantly
Solution Approach 1:
The patent designs a universal driving electrode structure with dummy electrodes that can accommodate multiple color channels (red, green, blue, and white LEDs) simultaneously. The dummy electrode configuration serves all color types with the same geometric pattern, allowing a single transfer process design to handle diverse LED types without requiring separate optimized processes for each color.
Data Source
AI summary
A driving circuit board includes a driving circuit board includes: a plurality of driving electrode regions on a surface of the driving circuit board; a plurality of driving electrodes symmetrically arranged on the plurality of driving electrode regions; and a driving circuit electrically connected to at least one of the plurality of driving electrodes, wherein the plurality of driving electrodes include at least one dummy electrode that is not connected to the driving circuit.