Micro LED Pixel Circuit Compensation for Luminance Uniformity
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Solution Overview
Problem
Micro LED pixel circuits in display panels face non-uniform luminance due to variations in device characteristics and power line impedances, leading to inconsistent picture quality across different areas of the panel.
Innovation Solution
A pixel circuit design incorporating a driving transistor, light emission element, compensation circuit, storage capacitor, and writing circuit, where the compensation circuit forms a diode-connected structure with the driving transistor to detect and compensate for threshold voltage variations, and the writing circuit provides different voltages to the storage capacitor terminals to mitigate current offsets, ensuring uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If Micro LED pixel circuits are used in display panels, then low power consumption and high color saturation are achieved, but non-uniform luminance occurs due to device characteristic variations and power line impedances
Solution Approach 1:
The patent applies preliminary action by implementing a compensation circuit that proactively detects and corrects threshold voltage variations of the driving transistor before they affect luminance uniformity. The compensation circuit performs threshold voltage detection and data voltage adjustment in advance, ensuring consistent display quality across different pixel locations despite manufacturing variations.
Solution Approach 2:
The patent implements feedback mechanisms through the compensation circuit that continuously monitors the driving transistor's threshold voltage and adjusts the data voltage accordingly. This closed-loop feedback system compensates for device characteristic variations and power line impedance effects, maintaining uniform luminance across the display panel.
2Illumination intensity
If compensation circuits are added to detect and compensate threshold voltage variations, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the compensation circuit functions with existing pixel circuit components, integrating threshold voltage detection and data voltage adjustment capabilities into the conventional pixel structure. This consolidation achieves luminance uniformity compensation while minimizing the increase in device complexity by reusing existing circuit elements.
Solution Approach 2:
The compensation circuit is designed to perform multiple functions including threshold voltage detection, data voltage adjustment, and interaction with the storage capacitor, allowing a single circuit module to address multiple sources of luminance non-uniformity (threshold voltage variations and power line impedance effects) simultaneously.
3Reliability
If writing circuits provide different voltages to storage capacitor terminals to mitigate current offsets, then display consistency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the voltage levels applied to the storage capacitor terminals based on detected threshold voltage variations. The writing circuit modifies the data voltage parameter in response to compensation circuit feedback, enabling display consistency across different pixel locations while accommodating manufacturing tolerances through adaptive voltage control.
Data Source
AI summary
A pixel circuit including a driving transistor, a light emission element, a compensation circuit, a storage capacitor, and a writing circuit is provided. The light emission control circuit is configured to selectively conduct the light emission element to the driving transistor. The compensation circuit is coupled with the light emission control circuit and a control terminal of the driving transistor, and is configured to form a diode-connected structure with the driving transistor. The storage capacitor includes a first terminal and a second terminal. The first terminal of the storage capacitor is coupled with the control terminal of the driving transistor, and the light emission control circuit is configured to selectively conduct the second terminal of the storage capacitor to a first power terminal. The writing circuit is configured to provide different voltages to the first terminal of the storage capacitor and the second terminal of the storage capacitor.