Pixel Circuit Bias Adjustment for Stable Display Drive Current
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Solution Overview
Problem
Existing pixel circuits in self-luminous display panels have complex driving processes and high processing requirements, leading to increased complexity and cost in the driver circuit.
Innovation Solution
The display panel incorporates a pixel circuit with a drive module, compensation module, reset module, and bias adjustment module, where the compensation module operates in multiple stages to simplify the driving process and reduce the processing demands on the driver circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex driving process is used for the pixel circuit, then the drive current can be supplied to the light-emitting element, but the processing complexity and cost of the driver circuit increase
Solution Approach 1:
The pixel circuit is divided into multiple functional modules: a drive module for supplying drive current, a compensation module for compensating threshold voltage shifts, a reset module for resetting the pixel circuit, a data write module for writing data signals, and a bias adjustment module for adjusting bias voltages. Each module performs a specific function independently, which simplifies the overall driver circuit design while ensuring reliable drive current supply to the light-emitting element.
2Reliability
If a complex driving process is used for the pixel circuit, then the light-emitting element can be driven, but the processing preparation cost of the driver circuit increases
Solution Approach 1:
The pixel circuit is segmented into independent functional modules that can be designed and manufactured separately. This modular approach reduces the complexity of the driver circuit, thereby lowering processing preparation costs while maintaining the ability to reliably drive the light-emitting element.
Solution Approach 2:
The pixel circuit modules are designed with universal interfaces and standardized structures, allowing them to be reused across different display panel designs. This multi-functionality reduces the need for custom driver circuit designs, thereby reducing manufacturing costs while ensuring reliable operation of the light-emitting element.
3Stability of the object's composition
If the compensation module is kept on during multiple stages, then the drive current stability is improved, but the power consumption increases
Solution Approach 1:
The compensation module is operated periodically during specific stages of the pixel circuit operation (reset stage, data write stage, and bias adjustment stage) rather than continuously. This periodic operation maintains drive current stability when needed while reducing power consumption during other stages, achieving a balance between stability and energy efficiency.
Data Source
AI summary
A display panel and a display device are provided. A compensation module of a pixel circuit of a display panel is on in a bias adjustment stage, a data write stage, and a time period between the bias adjustment stage and the data write stage; and/or, a reset module of the pixel circuit is on in the bias adjustment stage and a reset stage and is turned off at least after the compensation module is turned on.