OLED Pixel Circuit Partition Control for Uniform Light Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pixel circuits in large-sized OLED display devices struggle to achieve uniform light emission and consistent device characteristics, which is crucial for maintaining image quality and efficiency.
Innovation Solution
The proposed pixel circuit includes a driving circuit, data writing circuit, reset circuit, light-emitting control circuit, and a partition control circuit, which allows for precise control of driving currents and voltages, ensuring uniform light emission and consistent device characteristics. The partition control circuit applies data or reference voltages to the driving circuit's control terminal in response to a partition control signal, enabling partitioned display and improved refresh rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pixel circuits are used in large-sized OLED display devices, then device simplicity is maintained, but uniformity of light emission and consistency of device characteristics deteriorate
Solution Approach 1:
The pixel circuit is divided into multiple functional modules: driving circuit module, data writing circuit module, reset circuit module, light-emitting control circuit module, and partition control circuit module. Each module performs a specific function, allowing for precise control of driving currents and voltages to different regions, thereby achieving uniform light emission across the display device while maintaining manageable complexity through modular design
Solution Approach 2:
The partition control circuit applies different voltages (data voltage or reference voltage) to different regions of the driving circuit based on partition control signals. This local differentiation allows each region to receive optimized control signals tailored to its specific requirements, improving overall uniformity while using a standardized circuit architecture that doesn't significantly increase complexity
2Manufacturing precision
If partition control circuit is added to achieve uniform light emission, then light emission uniformity improves, but device complexity increases
Solution Approach 1:
The partition control circuit is designed to perform multiple functions: it can apply data voltage during normal operation, apply reference voltage during reset phases, and control the timing of these operations. This multi-functionality allows a single additional circuit module to address multiple aspects of uniformity control without proportionally increasing overall device complexity
Solution Approach 2:
The reset circuit applies reference voltage to the driving circuit in advance before data writing occurs. This preliminary action initializes the driving circuit to a known state, compensating for threshold voltage variations and ensuring consistent starting conditions for all pixels, thereby improving device characteristics consistency without requiring complex real-time adjustment mechanisms
3Productivity
If conventional driving methods are used, then device simplicity is maintained, but refresh rate and power efficiency deteriorate
Solution Approach 1:
The pixel circuit operates in periodic phases including reset phase, compensation phase, data writing phase, and light-emitting phase. During each phase, specific circuits are activated or deactivated based on timing signals. This periodic operation allows for optimized power consumption by only activating necessary circuits during specific phases while maintaining high refresh rates through efficient phase transitions
Solution Approach 2:
The reset circuit applies reference voltage and initializes the driving circuit in advance during the reset phase before the actual data writing and light emission occur. This preliminary initialization prevents the need for more complex continuous adjustment mechanisms during operation, reducing overall power consumption while enabling faster refresh cycles
Data Source
AI summary
A pixel circuit and a driving method thereof, and a display device are disclosed. The pixel circuit includes a driving circuit, a data writing circuit, a reset circuit, a light-emitting control circuit and a light-emitting element. The driving circuit includes a control terminal, a first terminal and a second terminal; the data writing circuit is connected to a first node to apply a data voltage; the reset circuit is connected to the first node to apply a reference voltage. The pixel circuit further includes a partition control circuit, which is connected to the first node and the control terminal, and is configured to apply the data voltage and the reference voltage to the control terminal; the reset circuit is connected to one of the first terminal and the second terminal of the driving circuit, and the reset circuit is further configured to apply an initialization voltage to the driving circuit.