Repair Circuit Unit for AMOLED Pixel Defect Compensation
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Solution Overview
Problem
Active Matrix Organic Light Emitting Display Devices (AMOLEDs) face yield reduction due to pixel circuit defects, which can degrade image quality and increase power consumption, limiting their expanded use.
Innovation Solution
Incorporating a repair circuit unit between pixel circuits on adjacent lines to drive organic light emitting diodes when defects occur, maintaining uniform image quality and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a repair circuit unit is added to repair pixel defects, then yield and reliability are improved, but device complexity increases
Solution Approach 1:
The repair circuit unit is nested within the display area by utilizing the space between pixel circuits on adjacent lines. The repair circuit includes transistors and capacitors that are integrated into the existing pixel structure, with the repair transistor positioned between the pixel circuits of adjacent lines, effectively nesting the repair functionality within the existing display architecture without requiring additional external circuitry.
Solution Approach 2:
The repair circuit unit serves multiple functions: it can repair pixel defects by providing alternative current paths, it maintains image quality by ensuring uniform display performance, and it reduces power consumption by enabling efficient defect compensation. The same repair circuit structure can handle various types of pixel defects including dead pixels, stuck pixels, and line defects, making it a universal solution for multiple failure modes.
2Illumination intensity
If pixel circuits are used to drive organic light emitting diodes, then image quality is maintained, but power consumption increases when defects occur
Solution Approach 1:
The repair circuit enables dynamic switching between normal pixel circuit operation and repair mode operation. When pixel defects are detected, the circuit dynamically reconfigures the current path through the repair transistor, allowing the system to adapt its operation mode based on the defect condition. This dynamic reconfiguration maintains image quality while optimizing power consumption by activating repair paths only when and where needed.
3Manufacturing precision
If repair circuits are disposed between pixel circuits on adjacent lines, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The repair circuit is positioned locally between the pixel circuits of adjacent lines, with the repair transistor specifically located in the region between corresponding pixel circuits on different lines. This local positioning allows precise targeting of defects in specific pixels or line segments without requiring global circuit reconfiguration, enabling localized repair while maintaining overall circuit simplicity.
Data Source
AI summary
An organic light emitting display device includes: a display area including a plurality of pixels including organic light emitting diodes, pixel circuits connected to the organic light emitting diodes, and one or more repair circuit units disposed between the pixel circuits of the pixels disposed on adjacent lines, in which the one or more repair circuit units include a plurality of repair circuits arranged to form at least one line within the display area.