Display Electrode Pad Layout for LED Defect Detection
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Solution Overview
Problem
Existing display devices face challenges in efficiently detecting defects caused by light emitting elements during the manufacturing process, which affects the overall efficiency and quality of the display.
Innovation Solution
The display device is designed with specific electrode configurations and pad parts that allow for individual detection of currents flowing through second electrodes, enabling the identification of defects in light emitting elements by applying voltages through first and second pads, and includes a manufacturing method to repair these defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual detection of currents flowing through second electrodes is implemented, then defect detection capability is improved, but device complexity increases
Solution Approach 1:
The display device is divided into multiple pixel regions, each with its own second electrode that can be individually accessed through separate second pads. This segmentation allows independent current detection for each pixel or group of pixels, enabling precise defect detection without requiring complex system-wide measurement arrangements.
Solution Approach 2:
Second pads serve as intermediary connection points between the second electrodes and the external detection system. These pads provide accessible interfaces that simplify the detection process by allowing current measurement through well-defined pathways without requiring direct access to the complex electrode network within the display area.
2Measurement precision
If voltages are applied through first and second pads to detect defects, then measurement precision is improved, but the number of required electrical connections increases
Solution Approach 1:
The first pads and second pads are designed to serve multiple functions: they provide power supply connections, signal input interfaces, and defect detection measurement points. This multi-functionality reduces the overall number of dedicated connections required, as the same pad structures are utilized for both operation and characterization purposes.
Solution Approach 2:
The detection circuitry is merged with the existing drive circuitry by utilizing the same pad structures and electrical pathways. The first and second pads that are already connected to pixel circuits for driving operations are also connected to detection circuits, combining two functions into a single integrated structure rather than adding separate dedicated detection pathways.
3Reliability
If defect detection is performed during manufacturing, then manufacturing quality is improved, but production time increases
Solution Approach 1:
Defect detection using the configured electrode and pad structure is performed during or immediately after the manufacturing process, allowing identification and sorting of defective displays while they are still in production. This preliminary detection enables quality control without requiring separate post-manufacturing testing phases, thereby maintaining manufacturing efficiency while ensuring reliability.
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 efficient detection and repair of defects in light emitting elements, improving the manufacturing efficiency and quality of the display device.
Implementation Method 1
light emitting elements electrically connected to the first electrodes
Implementation Method 2
second electrodes that are arranged separately from each other in the first direction and are electrically connected to the light emitting elements
Data Source
AI summary
A display device includes pixels that are arranged in a display area in a first direction and a second direction and that include first electrodes separated from each other and light emitting elements electrically connected to the first electrodes; second electrodes that are arranged separately from each other in the first direction and are electrically connected to the light emitting elements of the pixels arranged in the second direction; a first pad part including a first pad electrically connected to the first electrodes; and a second pad part including second pads electrically connected to different second electrodes among the second electrodes.