Light-Emitting Display Pixel Segmentation for Dark Spot Repair
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Solution Overview
Problem
Organic light emitting display apparatuses face issues with dark spots due to foreign substances generated between the anode and cathode electrodes during the sputtering process, leading to manufacturing defects and reduced production yield.
Innovation Solution
A light emitting display apparatus with a repair structure that includes a pixel electrode divided into two pixel divided electrodes, utilizing dual transistors with a mirror structure to independently drive subpixels, enabling automatic detection and repair of semi-dark targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cathode electrode is formed through a sputtering process, then the light emitting display apparatus can be manufactured, but foreign substances are generated between the anode electrode and cathode electrode causing dark spots
Solution Approach 1:
The pixel electrode is divided into a first pixel divided electrode and a second pixel divided electrode, which are independently controllable. This segmentation allows defective regions (dark spots) to be isolated and repaired independently without affecting the entire pixel, thereby resolving the contradiction between manufacturing ease and manufacturing precision by enabling targeted repair of sputtering-induced defects.
2Ease of repair
If the pixel electrode is divided into multiple divided electrodes with dual transistors, then repair of dark spots becomes possible, but the device structure becomes more complex
Solution Approach 1:
The pixel electrode is segmented into first and second pixel divided electrodes, each controlled by separate transistors. This segmentation enables independent repair of defective regions by controlling specific divided electrodes, improving ease of repair while maintaining manageable complexity through systematic division of functions.
Solution Approach 2:
The dual transistor structure provides multi-functionality: during normal operation, both transistors work together to drive the pixel; during repair mode, individual transistors can be activated to test and repair specific divided electrodes. This universal design improves ease of repair without requiring completely separate repair circuitry, thereby balancing ease of repair with device complexity.
3Extent of automation
If traditional non-divided pixel electrodes are used, then the device structure is simpler, but automatic detection and repair of semi-dark targets is not possible
Solution Approach 1:
The pixel electrode is divided into independently controllable first and second pixel divided electrodes. This segmentation enables automatic detection of semi-dark targets by independently activating and monitoring each divided electrode through its dedicated transistor, allowing automated identification of defective regions without requiring complex external testing equipment.
Solution Approach 2:
The dual transistor configuration with divided electrodes creates an inherent feedback mechanism where the state of each divided electrode can be independently monitored. This feedback enables automatic detection systems to identify semi-dark targets by comparing the performance of individual divided electrodes, thereby achieving automatic defect detection while maintaining a relatively simple structure through systematic design.
Data Source
AI summary
A light emitting display apparatus includes a light emitting element including a pixel electrode, an emission layer, and a common electrode, and a pixel circuit connected to the pixel electrode of the light emitting element and configured to include at least one thin film transistor, wherein the pixel electrode is divided into a first pixel divided electrode and a second pixel divided electrode, and at least a portion of the at least one thin film transistor is configured as a dual transistor connected to each of the first pixel divided electrode and the second pixel divided electrode.