Segmented Display Electrodes for Defective Pixel Repair
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Solution Overview
Problem
Existing display devices face challenges in efficiently repairing defective pixels, particularly when a defective light emitting element is present, as it can lead to non-emission areas and affect the overall display performance.
Innovation Solution
The display device incorporates a method where electrode patterns coupled with normal and defective light emitting elements are separated by forming cutting lines, allowing the defective element to be disconnected, thereby enabling the other light emitting elements to operate normally and minimizing non-emission areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode patterns are continuously connected to all light emitting elements, then electrical connectivity is maintained, but defective elements cause non-emission areas and reduce display performance
Solution Approach 1:
The electrode pattern is divided into multiple separate electrode segments instead of being continuously connected. Each electrode segment corresponds to a specific light emitting element, allowing selective disconnection of defective elements while maintaining connectivity for normal elements. This segmentation enables the display to maintain high reliability by isolating defects to minimal areas only.
2Area of stationary object
If cutting lines are formed to separate defective light emitting elements, then non-emission areas are minimized, but the device complexity increases due to additional manufacturing steps
Solution Approach 1:
The electrode pattern is pre-designed with built-in separation regions and discontinuities at the manufacturing stage, rather than requiring post-manufacturing cutting or repair operations. This preliminary structuring allows defective elements to be electrically isolated through simple laser cutting or ablation of pre-defined weak points, significantly reducing the complexity of the repair process while minimizing non-emission areas.
3Ease of manufacture
If all light emitting elements are connected to electrodes, then manufacturing is simplified, but defective elements cannot be isolated and repair is difficult
Solution Approach 1:
The electrode pattern is segmented into independent electrode sections, each capable of being selectively connected or disconnected. This segmentation maintains manufacturing simplicity by using standard electrode formation processes, while simultaneously enabling easy repair by allowing selective isolation of defective light emitting elements through minimal cutting or ablation of the electrode material at predefined separation points.
Data Source
AI summary
A display device may include: a base layer including a display area and a non-display area; and a plurality of pixels in the display area, and each including a plurality of sub-pixels each including an emission area configured to emit light and a peripheral area around the emission area. The sub-pixels may include: at least one first electrode and at least one second electrode extending in a direction and spaced apart from each other; and a plurality of light emitting elements between a first electrode of the at least one first electrode and a second electrode of the at least one second electrode and configured to emit light. At least one of the first electrode and the second electrode may include at least two first electrode patterns spaced apart from each other, and coupled by at least one first connection pattern in the emission area.