MicroLED Display Panel Block Layout for Local Defect Detection
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Solution Overview
Problem
Conventional microLED display panels face challenges in detecting and repairing defects due to increased impedance along electric wires, leading to overdriving or underdriving of microLEDs, and difficulty in identifying abnormality locations among a large number of connected microLEDs.
Innovation Solution
The microLED display panel is designed with locally disposed probe pads within each block, connected via electric wires, confined to that block, allowing independent detection and repair without affecting other blocks, and connections are severed permanently after detection/repair using laser cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If probe pads are disposed on peripheral areas for detecting bonded microLEDs, then detection can be performed, but impedance increases along electric wires causing microLEDs to be overdriven or underdriven
Solution Approach 1:
The display panel is divided into multiple blocks, with each block having its own local probe pads and electric wires confined to that block. This segmentation reduces the length of electric wires within each block, thereby reducing impedance and improving driving accuracy while maintaining detection capability.
2Difficulty of detecting and measuring
If a large amount of microLEDs are electrically connected for detection, then comprehensive detection is achieved, but it becomes difficult to identify locations of abnormality
Solution Approach 1:
By dividing the display panel into multiple blocks with local probe pads in each block, the system maintains comprehensive detection coverage while enabling precise location identification of abnormalities. Each block's local detection system can independently identify issues within its boundaries.
Solution Approach 2:
Each block is equipped with local probe pads and confined electric wires, creating localized detection zones. This allows the system to maintain high detection coverage while providing clear spatial information about abnormality locations through the block structure.
3Productivity
If probe pads and electric wires are disposed locally and confined to corresponding blocks, then detection and repair efficiency is enhanced, but device complexity increases
Solution Approach 1:
The display panel is segmented into multiple blocks, each with local probe pads and confined electric wires. This segmentation improves detection and repair efficiency by isolating functional units, while the modular nature of the segmentation prevents excessive complexity from propagating across the entire system.
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 enhances detection and repair efficiency by ensuring localized detection and repair, preventing interference between blocks and reducing the risk of malfunctions during laser cutting.
Implementation Method 1
connections are severed permanently after detection/repair using laser cutting
Data Source
AI summary
A micro-light-emitting diode (microLED) display panel includes microLEDs disposed on a display area, which is divided into a plurality of blocks; drivers respectively disposed on the blocks; and probe pads disposed within each block, the probe pads being electrically connected to corresponding microLEDs via corresponding electric wires. The probe pads and the electric wires of a corresponding block are disposed locally and confined to the corresponding block, and are not connected elsewhere beyond the corresponding block.