Dummy Pixel Repair Line for OLED Defective Pixels
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Solution Overview
Problem
Large and high-resolution organic light-emitting display apparatuses face decreased production yield and quality degradation due to defective pixels, which generate bright spots that are highly visible and difficult to manage.
Innovation Solution
The implementation of a dummy pixel system with a repair line that allows for the separation and reconnection of light-emitting elements, enabling control over light emission and resetting to display black, thereby allowing for the normal driving of defective pixels and improving production yield and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-emitting element is separated from a defective light-emitting pixel, then the defective pixel can be repaired and normal driving restored, but the device complexity increases due to the need for repair lines and dummy pixels
Solution Approach 1:
The pixel circuit is divided into separate functional components: the light-emitting element is separated from the pixel circuit, allowing independent repair. The repair line is segmented to connect only the necessary components (dummy pixel, fourth transistor, capacitor) while leaving other pixel circuits intact, reducing the scope of complexity addition.
Solution Approach 2:
A dummy pixel is introduced as an intermediary component that mediates between the repair line and the light-emitting element. This dummy pixel contains the necessary transistors and capacitors to control the separated light-emitting element, providing a buffer that manages the complexity of the repair mechanism.
2Reliability
If a repair line is introduced to couple the dummy pixel to the light-emitting element, then control over light emission is restored, but the manufacturing precision requirements increase
Solution Approach 1:
The repair line and dummy pixel are pre-configured during manufacturing with predetermined connection points and routing. The dummy pixel's transistors and capacitors are pre-positioned to ensure proper electrical connections, reducing the precision demands on the actual repair process by having the infrastructure ready in advance.
Solution Approach 2:
The dummy pixel serves multiple functions: it acts as a control unit for the separated light-emitting element, provides signal buffering through its capacitor, and can be used for both normal operation and repair modes. This multi-functionality reduces the need for additional specialized components, simplifying the overall repair structure.
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 raises the production yield and improves display quality by enabling the normal operation of defective pixels and reducing luminescence differences between repaired and normal pixels.
Implementation Method 1
the light-emitting element may be configured to emit light according to a driving voltage received from the fourth thin film transistor coupled to the repair line
Data Source
AI summary
An organic light-emitting display apparatus for forming a frame by utilizing a plurality of subfields to display gradation. The organic light-emitting display apparatus includes a light-emitting pixel on a display area, a dummy pixel on a dummy area adjacent to the display area, and a repair line coupled to the dummy pixel. The light-emitting pixel is configured to emit light according to a logic level of a data signal applied during each of the subfields, and to adjust an emission time. The repair line is configured to couple the dummy pixel to a light-emitting element when the light-emitting element is separated from the light-emitting pixel, to provide a path to control a light emission of the light-emitting element according to a logic level of a dummy data signal applied to the dummy pixel.