Pixel Circuit Defect Compensation for OLED Luminance
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Solution Overview
Problem
Display devices, particularly those using light emitting elements, face challenges in maintaining target luminance due to defects in light emitting elements, which affect the overall performance and efficiency of the display.
Innovation Solution
A pixel structure is designed with specific transistors and circuit components, including a light emitting element, transistors, a resistor, and an amplifier, to sense current flow and calculate a defect rate, allowing for compensation of driving power to maintain target luminance. This structure includes a display panel with a scan driver, data driver, power supply, and timing controller that adjusts power based on calculated defect rates to ensure consistent light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are used in display devices, then display performance and luminance are improved, but defects in light emitting elements cause loss of light emission and reduce reliability
Solution Approach 1:
The patent applies preliminary action by measuring the light emission characteristics of light emitting elements during the manufacturing process before they are installed in the display device. This allows defective elements to be identified and replaced in advance, ensuring only functional elements are used in the final product, thereby maintaining high luminance performance while improving reliability.
2Productivity
If light emitting elements are installed in display devices, then display functionality is achieved, but defects in these elements affect overall display performance
Solution Approach 1:
The patent implements preliminary measurement of light emitting element characteristics during manufacturing, allowing defective elements to be screened out before installation. This ensures that only elements meeting performance criteria are installed, maintaining display functionality while ensuring consistent performance across all pixels.
Solution Approach 2:
The patent establishes a feedback mechanism where the measured light emission characteristics of light emitting elements are used to determine their suitability for installation. This feedback loop ensures that only elements with acceptable performance parameters are deployed, maintaining display functionality and performance consistency.
3Illumination intensity
If light emitting elements are used to achieve target luminance, then display quality is improved, but defects cause deviation from target luminance
Solution Approach 1:
The patent applies preliminary measurement of light emitting element properties during manufacturing to identify and replace defective elements. This preliminary screening ensures that only elements capable of achieving target luminance are installed, improving both display quality and luminance control precision.
Solution Approach 2:
The patent replaces the mechanical/installation-based selection of light emitting elements with an electrical measurement-based selection process. By measuring light emission characteristics electrically during manufacturing, the system achieves more precise control over luminance performance compared to traditional installation-based selection.
Data Source
AI summary
A pixel includes a light emitting element, a first transistor including a gate electrode electrically connected to a first node, a second transistor including a gate electrode connected to a first scan line, a third transistor including a gate electrode connected to the first scan line, a fourth transistor including a gate electrode connected to a second scan line, a fifth transistor including a gate electrode electrically connected to a third scan line, an sixth transistor including a gate electrode electrically connected to the third scan line, a resistor electrically connected in parallel with the sixth transistor between the second node and the anode of the light emitting element, and an amplifier having a non-inverting terminal and an inverting terminal electrically connected to ends of the resistor, respectively.