Pixel Driving Circuit Uniform Brightness Compensation
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Solution Overview
Problem
Existing pixel driving circuits face issues with uneven display brightness due to differences in threshold voltages and power supply voltages of driving transistors across different sub-pixel units, leading to the hourglass phenomenon and inefficiencies in miniaturization and cost-effectiveness.
Innovation Solution
A pixel driving circuit is designed with a signal writing circuit, a driving circuit, memory circuits, a compensation circuit, a light-emitting control circuit, and a reset circuit, which allows for independent control of driving current and threshold voltage compensation, eliminating the dependency on threshold voltage and power supply voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional pixel driving circuits are used, then the circuit structure is simple, but the display brightness is uneven due to threshold voltage and power supply voltage variations
Solution Approach 1:
The pixel driving circuit is divided into multiple functional modules: a driving circuit module, a first memory circuit module, a second memory circuit module, a compensation circuit module, a light-emitting control circuit module, and a reset circuit module. Each module performs a specific function, allowing independent control of driving current and threshold voltage compensation, thereby achieving uniform display brightness while maintaining clear functional separation
Solution Approach 2:
The first and second memory circuit modules act as intermediaries to store voltage signals independently. The first memory circuit stores the voltage corresponding to the data signal, while the second memory circuit stores the voltage corresponding to the threshold voltage. This intermediary storage mechanism enables the circuit to compensate for threshold voltage variations and power supply voltage fluctuations, achieving uniform display brightness
2Manufacturing precision
If threshold voltage compensation is implemented, then display brightness uniformity improves, but circuit complexity increases
Solution Approach 1:
The compensation circuit module combines the first memory circuit module and the second memory circuit module into a unified compensation mechanism. By merging the data signal storage and threshold voltage storage functions into a coordinated system, the circuit achieves effective threshold voltage compensation without requiring completely separate compensation circuits, thus balancing compensation accuracy with circuit complexity
Solution Approach 2:
The memory circuit modules serve multiple functions: they store data signals, store threshold voltage information, and enable both normal driving and compensation operations. This multi-functionality reduces the need for dedicated separate circuits for each function, thereby improving threshold voltage compensation accuracy while limiting the increase in overall circuit complexity
3Manufacturing precision
If independent control of driving current and threshold voltage compensation is achieved, then display brightness uniformity improves, but device complexity increases
Solution Approach 1:
The circuit employs dynamic control through separate control signal lines for the driving circuit module and compensation circuit module. The driving circuit can be controlled to output driving current based on data signals, while the compensation circuit can be independently activated to compensate for threshold voltage variations. This dynamic, independently controllable architecture achieves precise driving current control and uniform display brightness while managing device complexity through efficient signal management
Data Source
AI summary
A pixel driving circuit and a driving method therefor, and a display panel and a driving method therefor are described. The pixel driving circuit includes a signal writing circuit connected to a composite signal end, a gate driving signal end, and a first node, configured to transmit a signal of the composite signal end in response to a signal of the gate driving signal end; a driving circuit; a first memory circuit connected between the first node and a second node; a second memory circuit connected between the second node and a first power supply end; a compensation circuit connected to the second node, a third node, and a control signal end; a light-emitting control circuit connected to the third node, a fourth node, and an enable signal end; and a reset circuit connected to the composite signal end, the second node, and a reset signal end.