Groove Power Line Stabilizes OLED Storage Capacitor
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Solution Overview
Problem
Misalignment of the mask during the manufacturing of organic light-emitting display panels can result in defective storage capacitors, leading to variations in pixel brightness due to changes in storage capacitor capacity.
Innovation Solution
The overlapping area of the power line and storage electrode is maintained constant by forming a groove portion on the lateral side of the power line, ensuring the storage capacitor capacity remains consistent even with shifts in the storage electrode's position, through the inclusion of a groove portion with a length equal to or greater than the storage electrode's height and an auxiliary storage electrode that overlaps the power line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the storage electrode is formed using a standard photolithography process, then the manufacturing process is simple and fast, but mask misalignment causes the storage electrode to shift position, resulting in variable storage capacitor capacity and pixel brightness
Solution Approach 1:
The power line is designed with a groove portion at the specific location where it overlaps with the storage electrode. This local structural modification creates a compensation mechanism that maintains constant overlapping area regardless of storage electrode position variations, thereby stabilizing storage capacitor capacity while preserving the simplicity of the overall manufacturing process
Solution Approach 2:
The groove portion is pre-formed in the power line before the storage electrode is deposited. This advance preparation creates a tolerance buffer that compensates for potential mask misalignment, ensuring that even if the storage electrode shifts position, the overlapping area with the power line remains constant, thus preventing brightness variations
2Quantity of substance
If the overlapping area of power line and storage electrode is increased to improve storage capacitor capacity, then the storage capacitor capacity increases, but any mask misalignment will cause larger position shifts, leading to greater variability in capacity across pixels
Solution Approach 1:
Instead of uniformly increasing the overlapping area across the entire power line, the groove portion is strategically placed only at the critical overlap region with the storage electrode. This localized approach maintains adequate storage capacitor capacity while creating a compensation mechanism that ensures uniform capacity across all pixels despite mask misalignment
Solution Approach 2:
The groove portion is pre-formed in the power line to compensate for potential storage electrode position shifts. This advance compensation ensures that the overlapping area remains constant even when mask misalignment occurs, thereby maintaining uniform storage capacitor capacity across all pixels
Data Source
AI summary
An organic light-emitting display panel having a storage capacitor comprised of a storage electrode overlapping a power line with a first gate-insulating layer disposed therebetween, wherein the storage capacitor includes a groove portion formed on a lateral side of the power line overlapping the storage electrode so that the overlapping area of the power line and the storage electrode is kept constant, and a method of manufacturing the same.