OLED Dummy Circuit Repair for Pixel Defects
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) displays face challenges in effectively repairing defective pixels, particularly in maintaining image quality as the display size increases, with existing black spot repair methods being inefficient and economically disadvantageous.
Innovation Solution
The implementation of a dummy circuit system that includes first and second dummy lines and dummy driving pads, allowing for the transmission of data signals to faulty pixels through dummy connections, effectively driving the pixels as normal pixels by short-circuiting the dummy lines with the OLED, thereby bypassing the faulty pixel circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If black spot repair method is used to remove defective cathodes, then defective pixels can be repaired, but the aperture ratio decreases and image quality deteriorates
Solution Approach 1:
The patent introduces dummy circuit portions and dummy lines as intermediary elements that mediate between the driving circuit and defective pixels. These dummy components serve as alternative pathways that allow defective pixels to be driven without removing the cathode, thus maintaining the original aperture ratio while still achieving repair functionality.
Solution Approach 2:
The patent segments the driving circuit into functional portions and dummy portions. The dummy circuit portions are separately controllable and can be selectively activated to drive specific defective pixels, allowing localized repair without affecting the entire display structure or aperture ratio.
2Reliability
If conventional repair methods are used, then defective pixels can be addressed, but economic costs increase and repair efficiency decreases
Solution Approach 1:
The patent implements preliminary action by pre-configuring dummy circuit portions and dummy lines during the manufacturing process, before any defects occur. This allows for rapid repair activation without requiring complex post-manufacturing modifications, thereby improving repair efficiency and reducing economic costs.
Solution Approach 2:
The patent creates simplified copies of the original pixel circuits as dummy circuit portions. These dummy circuits replicate the essential functionality needed to drive the OLED, providing a cost-effective and efficient repair mechanism that avoids the need for complex cathode removal and reconfiguration procedures.
3Area of stationary object
If display size increases, then image quality should improve, but repair difficulty increases and traditional methods become less effective
Solution Approach 1:
The patent implements universal repair functionality through dummy circuit portions that can be applied to any defective pixel regardless of display size. The same dummy circuit architecture and driving method can be used across different display dimensions, making the repair process equally effective for both small and large displays without increasing complexity.
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 method enables the repair of defective pixels by driving them as normal pixels, improving the aperture ratio and maintaining image quality, especially in larger displays, while reducing economic costs associated with traditional repair methods.
Implementation Method 1
Electrons injected from one of the electrodes, i.e., a cathode, and holes injected from another of the electrodes, i.e., an anode, are bonded to each other in the organic light emitting layer to form excitons. Light is emitted while the excitons discharge energy.
Data Source
AI summary
An organic light emitting diode display includes a substrate having a display unit and a peripheral portion, scan lines in a first direction, data lines in a second direction, pixels in the display unit and having pixel circuit portions and organic light emitting diodes, first dummy lines in the display unit and extending in the first direction, at least one second dummy line in the peripheral portion and extending in the second direction, dummy circuit portions connected to a first dummy line and the at least one second dummy line, driving pads connected to end portions of the data lines, at least one dummy driving pad connected to an end portion of the at least one second dummy line, and a driving circuit configured to transmit a data signal to the driving pads and to the at least one dummy driving pad.