Pixel Circuit Resetting Architecture for OLED Hysteresis Control
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Solution Overview
Problem
The hysteresis phenomenon in pixel circuits of display devices, particularly in OLEDs, adversely affects display quality, especially during low-frequency operations, making it difficult to achieve optimal display performance.
Innovation Solution
A pixel circuit design incorporating multiple resetting circuits and control circuits to manage initial voltages and connections dynamically, mitigating hysteresis by applying bias voltages and ensuring consistent potential states across transistors, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel circuit is used, then the device complexity is low, but hysteresis phenomenon occurs severely affecting display quality
Solution Approach 1:
The pixel circuit is divided into multiple functional modules: first resetting circuit, second resetting circuit, control circuit, and driving circuit. Each module performs a specific function to manage voltage and connections, thereby reducing hysteresis while maintaining manageable complexity through functional segmentation.
Solution Approach 2:
The first resetting circuit writes a first initial voltage into the first node before the driving circuit operates. The second resetting circuit writes a second initial voltage into the first node before the light-emitting element operates. These preliminary voltage setting actions ensure consistent initial states and mitigate hysteresis effects before the main operation begins.
2Reliability
If multiple resetting circuits are added to mitigate hysteresis, then display quality improves, but device complexity increases
Solution Approach 1:
The resetting function is segmented into two independent circuits: first resetting circuit that writes first initial voltage, and second resetting circuit that writes second initial voltage. Each circuit operates independently with its own control signals, allowing parallel execution and reducing overall complexity compared to a single complex resetting mechanism.
Solution Approach 2:
The control circuit dynamically controls the electrical connections between nodes based on operation stage. During first resetting stage, first resetting circuit connects to first node. During second resetting stage, second resetting circuit connects to first node. This dynamic connection control allows multiple resetting circuits to operate without creating complex interdependencies.
3Stability of the object's composition
If dynamic connection control is implemented, then transistor potential consistency improves, but control circuit complexity increases
Solution Approach 1:
The control circuit dynamically switches electrical connections between nodes based on operation stages. During first resetting stage, it connects first resetting circuit to first node. During second resetting stage, it connects second resetting circuit to first node. This dynamic control ensures consistent transistor potentials by establishing appropriate voltage relationships at each stage.
Solution Approach 2:
The control circuit establishes the appropriate electrical connections before voltage writing occurs. By pre-configuring the connection state during each resetting stage, the circuit ensures that voltage is written to the correct node with the correct reference, maintaining potential consistency without requiring complex real-time adjustments.
Data Source
AI summary
The present disclosure provides a pixel circuit, and a display device. The pixel circuit includes a light-emitting element, a first resetting circuit, a control circuit and a driving circuit. The first resetting circuit writes a first initial voltage into a first node under the control of a first resetting control signal. The control circuit controls a control terminal of the driving circuit to be electrically connected to the first node under the control of a first control signal from the first control terminal, and controls the first node to be electrically connected to the first terminal of the driving circuit under the control of a second control signal from a second control terminal. A first terminal of the driving circuit is electrically connected to the light-emitting element, and the driving circuit is configured to drive the light-emitting element to emit light.