OLED Display Test Unit for Early Defect Detection
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Solution Overview
Problem
Organic light emitting display devices face challenges in detecting defects early in the manufacturing process, leading to increased waste and reduced manufacturing efficiency due to the complexity of test operations and the need for multiple testing stages.
Innovation Solution
An organic light emitting display device is designed with a test unit that includes a switching element connected between a data line and signal pads, with conductive patterns in different layers to facilitate stable test signal supply, allowing for early defect detection and improved yield through a multi-layer structure and dummy pads for electrical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple testing stages are implemented to detect defects, then measurement precision is improved, but device complexity and manufacturing time increase
Solution Approach 1:
The patent implements array testing before cell testing, allowing defects to be detected at an early stage in the manufacturing process. This preliminary action enables early identification of defective pixels, reducing waste and improving manufacturing efficiency by preventing further processing of defective panels.
Solution Approach 2:
The testing process is divided into distinct stages: array testing performed on the entire panel, and cell testing performed on individual pixels. This segmentation allows for efficient defect detection at different levels, with array testing providing a quick overview and cell testing providing detailed pixel-level analysis.
2Device complexity
If test signal supply is simplified, then device complexity is reduced, but reliability of test signal supply deteriorates
Solution Approach 1:
The patent transitions from planar conductive patterns to three-dimensional vertically stacked conductive patterns. Multiple conductive patterns are arranged in different layers (first conductive pattern, second conductive pattern, third conductive pattern) at different vertical positions, providing redundant signal paths and improving test signal supply reliability while maintaining a compact structure.
Solution Approach 2:
The conductive patterns are nested in a vertical stack configuration, with each conductive pattern positioned at a different height. This nested arrangement allows multiple signal paths to be integrated in a compact volume, providing both structural efficiency and signal redundancy for reliable test signal supply.
Data Source
AI summary
An organic light emitting display device includes a display unit including a first pixel column and a first data line connected to the first pixel column, a first pad unit including first and second signal pads, a test unit including a first switching element which is connected between the first data line and the first signal pad, and includes a control electrode connected to the second signal pad, a first conductive pattern provided in a different layer from that of the first signal pad and connected to the first signal pad, and a second conductive pattern provided in a different layer from that of the second signal pad and connected to the second signal pad, where the first and second conductive patterns are spaced apart from each other in the same layer, and a width of the first conductive pattern is greater than that of the second conductive pattern.