Micro LED Pixel Circuit for Accurate Brightness and Gray Tone Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pixel circuits for Micro Light Emitting Diode (Micro LED) displays struggle to accurately control brightness and gray tone, leading to poor working stability and reduced display effect due to inadequate control over the light emitting diodes.
Innovation Solution
A pixel circuit comprising multiple sub-circuits, including charging, storage, switching, and current control sub-circuits, which are connected in a specific configuration to control the light emitting diodes' conduction time, voltage, and current, allowing for precise adjustment of brightness and gray tone through time-varying signals and preset current densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pixel circuits are used to drive micro LED, then the circuit structure is simple, but the brightness and gray tone control accuracy is poor
Solution Approach 1:
The pixel circuit is divided into multiple functional sub-circuits: a first charging sub-circuit for writing data signals, a second charging sub-circuit for compensating threshold voltage, a storage sub-circuit for maintaining charge, and switching sub-circuits for controlling signal transmission timing. This segmentation allows each sub-circuit to perform its specific function optimally, achieving accurate brightness and gray tone control while managing circuit complexity through modular design.
2Reliability
If conventional pixel circuits are used to drive micro LED, then the circuit design is straightforward, but the working stability is poor
Solution Approach 1:
The second charging sub-circuit provides feedback compensation by detecting the threshold voltage of the switching transistors and adjusting the compensation charge accordingly. This feedback mechanism ensures that variations in transistor characteristics are compensated, maintaining stable operation and consistent display performance over time and across different operating conditions.
Solution Approach 2:
The storage sub-circuit performs preliminary action by pre-storing the necessary charge before the light emitting phase. This ensures that when the switching sub-circuits activate, the correct amount of charge is already available, preventing instability caused by charge depletion or timing variations during the actual light emission process.
3Illumination intensity
If conventional pixel circuits are used to drive micro LED, then the implementation is simple, but the display effect is reduced
Solution Approach 1:
The switching sub-circuits implement dynamic control by precisely managing the timing of signal transmission during different phases (writing phase, compensation phase, storage phase, and light emitting phase). This dynamic control allows the circuit to adapt to different display requirements, achieving superior display effects with accurate gray tone representation and smooth brightness transitions.
Data Source
AI summary
Provided are a pixel circuit, a driving method thereof and a display device. The pixel circuit includes a first charging sub-circuit, a second charging sub-circuit, a first storage sub-circuit, a first switching sub-circuit, a second switching sub-circuit and a light emitting sub-circuit. The first charging sub-circuit is configured to provide a signal of a first data signal terminal to a first node under control of a scanning signal terminal, and after providing the signal of the first data signal terminal, provide a signal of a second data signal terminal to the first node under control of a light emitting control terminal.