OLED Display Pad Asymmetry for Defect Prevention
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Solution Overview
Problem
Organic light emitting diode (OLED) display panels face issues with line defects such as short-circuits and foreign substance infiltration, which are difficult to detect and result in increased costs due to the complexity of the existing pixel structure and signal line arrangements.
Innovation Solution
The OLED display panel design includes data lines, gate lines, driving voltage lines, and reference voltage lines arranged in specific patterns with distinct distances between pads, allowing for non-active areas for integrated circuit attachment, preventing conductive ball accumulation and foreign substance infiltration, and enabling easier defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pad electrodes are disposed at identical distances, then the device structure is simplified and easier to manufacture, but line defects such as short-circuits occur more frequently when conductive balls gather together or foreign substances permeate
Solution Approach 1:
The patent applies asymmetry by disposing pad electrodes at different distances from the edge of the substrate. Specifically, the first pad electrode is disposed at a first distance from the edge, while the second pad electrode is disposed at a second distance that is different from the first distance. This asymmetric arrangement prevents conductive balls from gathering at the same location and reduces the risk of short-circuits, thereby improving reliability without significantly complicating the manufacturing process.
2Device complexity
If pad electrodes are disposed at identical distances, then the device structure is simpler, but line defects become difficult to detect during inspection
Solution Approach 1:
The asymmetric disposition of pad electrodes at different distances from the edge creates distinct spatial patterns that facilitate easier detection of line defects during inspection. The varying distances allow inspection systems to more readily identify abnormalities such as short-circuits or foreign substance infiltration, as the regular pattern is broken and anomalies become more apparent.
3Reliability
If reference voltage line is directly connected to each data driving integrated circuit, then the pixel structure functions properly, but manufacturing costs increase due to additional materials and complex assembly
Solution Approach 1:
The patent extracts the reference voltage connection from the pixel structure by disposing the reference voltage line separately from the data driving integrated circuit connections. The reference voltage line is connected to a pad electrode that is distinct from the data signal pad electrodes, and extends to a different location on the substrate. This separation simplifies the pixel structure and reduces manufacturing complexity while maintaining proper functional performance.
Data Source
AI summary
An organic light emitting diode display panel includes data lines arranged in a first direction; gate lines arranged in a second direction to cross the data lines; a driving voltage line arranged in the first direction; a reference voltage line arranged in the first direction; data pads respectively at ends of corresponding ones of the data lines; a driving voltage pad at an end of the driving voltage line; and a reference voltage pad at an end of the reference voltage line. A first distance is defined between the driving voltage pad and an adjacent data pad, a second distance is defined between adjacent ones of the data pads, and a third distance is defined between the reference voltage pad and an adjacent data pad. At least two of the first distance, the second distance, and the third distance are different from each other.