Pixel Circuit Driving High and Low Grayscale Levels
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Solution Overview
Problem
Current control driving circuits for Micro-LED/Mini-LED displays cannot independently drive high or low grayscale levels, and they fail to simultaneously support long-period light emission at high grayscale and high-current driving at low grayscale.
Innovation Solution
A pixel circuit with a driving module and light emitting modules, where the driving module controls the connection between power supply lines and nodes based on node potentials, and the light emitting units manage the communication between power supply lines and light emitting elements based on data wire potentials under scan wire control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a general current control driving circuit is used, then the circuit structure is simple, but it cannot independently drive high or low grayscale levels
Solution Approach 1:
The driving circuit is divided into two independent light emitting units, each capable of independently controlling high or low grayscale levels. The first light emitting unit includes transistors T2-T4 and capacitor C1, while the second light emitting unit includes transistors T6-T9 and capacitor C2. This segmentation allows each unit to operate independently for different grayscale requirements.
Solution Approach 2:
Each light emitting unit is designed with multi-functionality to handle both high and low grayscale driving. The units can be selectively activated based on the required grayscale level, allowing a single circuit design to serve multiple driving scenarios without requiring separate dedicated circuits for each function.
2Illumination intensity
If high current is applied for low grayscale driving, then the brightness is sufficient, but the light emitting period must be short
Solution Approach 1:
The driving circuit implements periodic action by alternating between high current/short duration mode and low current/long duration mode based on the grayscale requirements. The control circuit selectively activates different light emitting units or different operating modes of the same unit to achieve the desired balance between brightness and emission duration.
3Duration of action of moving object
If long period light emitting driving is implemented at high grayscale, then the display duration is extended, but the current consumption increases
Solution Approach 1:
The driving circuit dynamically adjusts the current consumption based on the required light emitting duration and grayscale level. The control circuit selectively activates different light emitting units with different current characteristics, allowing the system to optimize the balance between emission duration and energy consumption in real-time.
Data Source
AI summary
The disclosure provides a pixel circuit, a pixel driving method, and a display device. The pixel circuit includes a driving module and a light emitting module. The light emitting module includes a first light emitting unit, a first light emitting element, a second light emitting unit, and a second light emitting element.