OLED Repair Circuit Selective Coupling for Pixel Defect Compensation
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Solution Overview
Problem
OLED display devices face issues with pixel defects, which can lead to reduced display quality and yield due to the inability to effectively compensate for defects in the pixel circuit, resulting in inconsistent luminance and image quality.
Innovation Solution
The implementation of a repair circuit system that can selectively couple to the organic light emitting diode (OLED) in place of a defective pixel circuit, providing driving current and compensating for threshold voltage variations, thereby ensuring consistent light emission even when defects occur in the pixel circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a repair circuit is added to compensate for pixel defects, then reliability is improved, but device complexity increases
Solution Approach 1:
The display device is divided into normal pixel circuits and repair circuits as separate functional units. Each repair circuit is independently configured to compensate for specific defective pixels, allowing the system to maintain reliability without requiring complete redesign of the entire display circuitry.
Solution Approach 2:
A switching unit is introduced as an intermediary component that selectively connects either the normal pixel circuit or the repair circuit to the data line and common emission control line. This mediator enables the system to route signals appropriately based on pixel functionality, resolving the complexity issue by providing a controlled interface between the two circuit types.
2Adaptability or versatility
If repair circuits are coupled to all pixels, then adaptability is improved, but device complexity increases
Solution Approach 1:
Repair circuits are selectively coupled only to pixels that require compensation, rather than uniformly connecting to all pixels. The switching unit enables this local quality approach by activating the repair circuit connection only when a pixel defect is detected, thereby maintaining adaptability while reducing overall device complexity.
3Ease of operation
If the repair circuit is always connected to the pixel, then ease of operation is improved, but loss of energy increases
Solution Approach 1:
The connection between the repair circuit and the pixel is made dynamic through the switching unit, which can activate or deactivate the repair circuit based on real-time defect detection. This dynamic connection ensures that the repair circuit is only active when needed, maintaining ease of operation for defect compensation while minimizing energy loss during normal operation.
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 enables the OLED display device to maintain desired luminance and improve image quality by providing driving current through the repair circuit, compensating for pixel circuit defects and ensuring consistent performance.
Implementation Method 1
the OLED display device displays images using organic light emitting diodes that emit light through recombination of electrons and holes
Data Source
AI summary
An organic light emitting diode (OLED) display device includes a plurality of pixels each having a pixel circuit and an organic light emitting diode coupled to the pixel circuit. The OLED display device includes a scan driver which is configured to supply a scan signal to the scan lines and to supply an emission control signal to an emission control line commonly coupled to the pixels. The OLED display device also includes repair lines and repair circuits coupled to the repair lines. The repair circuits each have an output terminal coupled to an organic light emitting diode in corresponding pixel. A switching unit is configured to allow output lines of the data driver to be selectively coupled to the repair lines or the data lines.