Pixel Circuit Node Isolation for Stable Gray-Scale Drive
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Solution Overview
Problem
Existing pixel circuits in display devices suffer from fluctuations in drive signal potential due to the influence of the light-emitting element's anode potential, leading to poor display effects.
Innovation Solution
A pixel circuit design incorporating a reset circuit, data write circuit, light-emission control circuit, and drive circuit, where the first node is isolated from the light-emitting element's electrodes, allowing independent control of signal potentials and stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the first node is connected to the light-emitting element's electrodes, then the drive circuit can directly control the light-emitting element, but the drive signal potential fluctuates due to the influence of the anode potential
Solution Approach 1:
The pixel circuit is divided into functionally independent modules: the first node is separated from the light-emitting element electrodes, with the drive circuit controlling conduction between the second node and third node, while the light-emission control circuit controls conduction between the cathode and second node, and between the third node and pull-down power terminal. This segmentation isolates the drive signal path from the light-emitting element potential fluctuations.
Solution Approach 2:
The second node and third node serve as intermediary connection points between the drive circuit and the light-emitting element. The drive circuit does not directly connect to the light-emitting element electrodes but controls conduction through these intermediate nodes, which are further controlled by the light-emission control circuit, thereby isolating the drive signal from anode potential influence.
2Device complexity
If the pixel circuit uses a simple structure with direct connections, then the device complexity is reduced, but the gray scale representation accuracy deteriorates
Solution Approach 1:
The circuit is segmented into distinct functional blocks (drive circuit, light-emission control circuit, reset circuit, data write circuit) that can be implemented with standard transistor configurations. Each block performs a specific function, achieving accurate gray scale control through coordinated operation rather than complex interconnections.
Solution Approach 2:
The light-emission control circuit receives control signals and adjusts the conduction states of the second and third nodes based on the drive signal potential, creating a feedback mechanism that ensures accurate gray scale representation. The reset circuit and data write circuit further refine the control by preparing and setting the node states before light emission.
Data Source
AI summary
Provided is a pixel circuit. The pixel circuit includes a reset circuit, a data write circuit, a light-emission control circuit, and a drive circuit; wherein the reset circuit is configured to transmit a reset power signal supplied by the reset power terminal to the first node in response to a reset control signal; the data write circuit is configured to transmit a data signal supplied by the data signal terminal to the first node in response to a gate drive signal; the light-emission control circuit is configured to control conduction/non-conduction between the cathode of the light-emitting element and the second node, and control conduction/non-conduction between the third node and the pull-down power terminal, in response to a light-emission control signal; and the drive circuit is configured to control conduction/non-conduction between the second node and the third node in response to a potential of the first node.