Pixel Circuit for Micro LED Displays with Multi-Scan Emission Control
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Solution Overview
Problem
Micro light-emitting diode (μLED) display panels based on glass substrates face challenges in pixel circuit design and driving methods, which hinder their development and efficiency.
Innovation Solution
A pixel circuit is designed for μLED display panels, incorporating a voltage-control sub-circuit, emission-control sub-circuit, and various transistor configurations to set voltage levels and control driving currents, allowing for multiple scans in each cycle to achieve different time spans for light emission and improve pixel luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional pixel circuit designs are used for μLED display panels on glass substrates, then the display panel can be manufactured, but the pixel circuit design and driving method are insufficient to achieve high luminance and grayscale levels
Solution Approach 1:
The pixel circuit is divided into multiple functional sub-circuits including a driving sub-circuit, voltage-control sub-circuit, emission-control sub-circuit, reset sub-circuit, storage sub-circuit, and data-input-compensation sub-circuit. Each sub-circuit performs a specific function to collectively achieve high luminance and grayscale control while managing overall circuit complexity through modular organization.
Solution Approach 2:
The patent implements dynamic control of emission time spans through multiple scans in each cycle, where the emission-control sub-circuit adjusts the duration of light emission based on grayscale requirements. This dynamic timing control enables precise luminance regulation without requiring proportional increases in circuit complexity.
2Adaptability or versatility
If multiple scans are implemented to control emission time spans, then grayscale levels and luminance are improved, but the driving method becomes more complex
Solution Approach 1:
The voltage-control sub-circuit incorporates feedback mechanisms to monitor and adjust voltage levels based on emission-drive signals and gate-control signals. This feedback ensures accurate control of emission time spans and luminance levels, simplifying the driving method by automatically compensating for variations in μLED characteristics across multiple scans.
Solution Approach 2:
The patent utilizes parameter changes in voltage levels and time spans to achieve different grayscale levels. By varying the emission time span parameter across multiple scans and adjusting voltage parameters through the voltage-control sub-circuit, the system achieves versatile grayscale control without requiring complex driving sequences or additional hardware.
3Illumination intensity
If emission time span is extended to improve luminance, then pixel brightness increases, but the frame display time is reduced
Solution Approach 1:
The emission-control sub-circuit implements periodic action by distributing the total emission time across multiple scans within a frame cycle. Instead of continuous emission, the system uses periodic emission pulses in each scan, achieving high average luminance while maintaining the required frame display time through the cyclic repetition of emission and non-emission periods.
Data Source
AI summary
The present application discloses a pixel circuit for a light-emitting diode display panel. The pixel circuit includes a reset sub-circuit configured to initialize voltage levels of some nodes. Additionally, the pixel circuit includes a data-input and compensation sub-circuit configured to load a data signal and adjust the voltage levels of the nodes for determining a driving current flown through a driving sub-circuit. The pixel circuit further includes a voltage-control sub-circuit for controlling a switch sub-circuit to determine whether the driving current is flowing or not. Moreover, the pixel circuit includes an emission-control sub-circuit configured to control a partial time span in one scan for passing the driving current to the light-emitting diode to drive light emission. The one scan is one of multiple different scans in one cycle time of displaying one frame of image.