Pixel Driving Circuit Layout Using Multiplexed Reset Signals
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Solution Overview
Problem
In high-resolution display panels, the tight spacing of pixel driving circuits leads to issues such as leakage and crosstalk due to reduced wiring space, which affects display accuracy and response time.
Innovation Solution
The display panel design incorporates multiplexing of scan and light-emitting control signals as reset signals for both the driving transistor and light-emitting element, eliminating the need for additional reset lines and optimizing the pixel driving circuit layout by using transistors to control the on/off states of functional modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels and pixel driving circuits is increased to achieve higher resolution, then the display resolution is improved, but the wiring space is reduced causing leakage and crosstalk
Solution Approach 1:
The scan signal and light-emitting control signal are multiplexed to serve dual functions: they control the scan timing and light-emitting timing while simultaneously serving as reset signals for the driving transistor gate and light-emitting element anode. This multi-functionality eliminates the need for separate reset lines, reducing wiring complexity and preventing leakage and crosstalk in high-resolution displays
Solution Approach 2:
Multiple control functions (scan control, light-emitting control, and reset) are merged into a single signal line. The scan signal line and light-emitting control line are combined to provide both timing control and reset functions, thereby reducing the total number of wiring lines and preventing wiring-related issues in dense pixel arrangements
2Reliability
If additional reset lines are added to reset the driving transistor gate and light-emitting element anode, then the reset function is improved, but the wiring complexity and space requirements increase
Solution Approach 1:
Existing signal lines (scan line and light-emitting control line) are designed to perform multiple functions simultaneously. These lines provide both their original control functions and serve as reset signal lines, eliminating the need for additional dedicated reset lines and reducing overall wiring complexity
Solution Approach 2:
The reset function is merged with the existing scan and light-emitting control functions. By combining multiple control functions into existing signal lines, the patent avoids adding separate reset lines, thereby maintaining simple wiring structure while ensuring proper reset functionality
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a pixel driving circuit, a scan line, and a light-emitting control line connected to the pixel driving circuit. The pixel driving circuit includes a driving transistor, a first reset module, and a light-emitting element. An output terminal of the first reset module is connected to a gate of the driving transistor and an output terminal of the driving transistor is electrically connected to the light-emitting element. An input terminal of the first reset module is connected to the scan line or the light-emitting control line. A scan signal provided by the scan line or a light-emitting control signal provided by the light-emitting control line is multiplexed as a first reset signal provided by the reset module to the gate of the driving transistor.