OLED First Electrode Segmentation for Dark Spot Repair
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Solution Overview
Problem
Organic light emitting display devices face issues with dark spot defects due to foreign substances on electrodes, which are difficult to repair without causing additional defects, especially in non-repairable locations, leading to reduced yield and visibility.
Innovation Solution
The design incorporates a first electrode with alternating patterns that are partially recessed and protruded, allowing for electrical disconnection of defective areas and connection to adjacent sub-pixels through a repair pattern, reducing dark spots via light diffusion and improving repair efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a foreign substance remains on the first electrode, then dark spot defects occur, but repair techniques can normalize the affected area
Solution Approach 1:
The first electrode is divided into multiple segments (first, second, third, and fourth electrodes) with insulating regions between them. This segmentation allows defective portions to be isolated and repaired independently without affecting the entire electrode structure, enabling localized repair while maintaining overall display quality.
Solution Approach 2:
Different regions of the electrode structure are assigned different functions: light-emitting regions for display and insulating regions for electrical isolation. The insulating regions specifically provide local quality by preventing electrical interference between adjacent electrode segments, enabling targeted repair of defective areas.
2Reliability
If repair techniques are applied to normalize defective areas, then dark spot defects are reduced, but additional defects may be introduced
Solution Approach 1:
Insulating regions are pre-formed between adjacent electrode segments during the manufacturing process, before defects occur. This preliminary structural preparation enables future repair operations to be performed safely without risking damage to neighboring electrodes, as the insulating barriers are already in place.
Solution Approach 2:
Insulating regions act as intermediary elements between adjacent light-emitting electrodes. These intermediaries prevent electrical interaction between segments, allowing repair processes to be applied to one segment without causing harmful effects to adjacent segments.
3Ease of repair
If the first electrode is designed with alternating patterns including insulating regions, then repair efficiency is improved, but device complexity increases
Solution Approach 1:
The electrode is segmented into discrete units with insulating regions, which simplifies the repair process by allowing individual segments to be addressed separately. While the overall structure becomes more complex, the modular design actually reduces repair complexity by enabling targeted interventions.
Solution Approach 2:
The alternating pattern of light-emitting and insulating regions serves multiple functions: electrical isolation, mechanical support, and repair facilitation. This multi-functionality justifies the increased structural complexity by providing inherent repair capabilities without requiring additional separate components.
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 solution effectively reduces dark spot defects and enhances the visibility and yield of organic light emitting display devices by allowing for seamless light emission even with foreign substances present, through the use of interdigitated patterns and a repair mechanism that connects adjacent sub-pixels.
Implementation Method 1
a visible light generated from the organic light emitting layer
Implementation Method 2
reducing dark spots via light diffusion
Data Source
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AI summary
Disclosed is an organic light emitting display device including a plurality of sub-pixels on an array substrate in which each sub-pixel includes a circuit part (TFT) including a switching transistor, a driving transistor and a capacitor; and a light emitting part having a shape defined with a width and a length and including a first electrode (370) electrically connected to the driving transistor, an organic light emitting layer and a second electrode, the first electrode (370) including a first pattern (371) having a recess, a second pattern (272) having a protrusion received in the recess, and a third pattern (273) connecting the first and second patterns, wherein a depth of the recess is greater than a half of a longer of the width and the length of the light emitting part.