OLED Display Panel Switch Module for Gate Voltage Stability
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Solution Overview
Problem
In OLED display panels, the continuous leakage of charges through the initialization transistor affects the voltage stability of the gate electrode of the drive transistor, leading to unstable light-emitting brightness and display effects.
Innovation Solution
A display panel design that includes a switch module connecting the second electrodes of multiple sub-pixels to a common output terminal, reducing the number of leakage paths and alleviating voltage instability by suspending the voltage of the initialization transistor during the non-initialization phase, thereby improving display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the initialization transistor is used to initialize the drive transistor, then the drive transistor can be properly initialized, but charges continuously leak through the initialization transistor causing gate electrode voltage instability
Solution Approach 1:
The initialization transistor is dynamically controlled to be turned off after the initialization phase, transitioning from a continuously conducting state to a switched-off state. This dynamic control eliminates the continuous charge leakage path while preserving the initialization function when needed, thereby stabilizing the gate electrode voltage during the light-emitting phase.
Solution Approach 2:
The initialization transistor performs the initialization function in advance during a dedicated initialization phase before the light-emitting phase begins. By completing the initialization task beforehand and then turning off the transistor, the system achieves both proper initialization and subsequent voltage stability without continuous leakage.
2Reliability
If the initialization transistor remains on to maintain initialization, then the gate electrode can be kept at proper voltage, but charge leakage continues affecting display brightness stability
Solution Approach 1:
The initialization transistor operates periodically rather than continuously - it is turned on during the initialization phase to establish proper gate voltage, then turned off during the light-emitting phase to prevent charge leakage. This periodic operation pattern achieves both voltage control reliability and eliminates harmful continuous leakage currents.
Solution Approach 2:
The harmful charge leakage function is extracted and removed by turning off the initialization transistor after initialization is complete. The beneficial initialization function is retained when needed, while the harmful continuous conduction path is eliminated, separating the desired function from the unwanted side effect.
Data Source
AI summary
Disclosed are a display panel and a driving method. The display panel includes: a substrate, sub-pixels and a switch module. Each sub-pixel includes a pixel drive circuit and a light-emitting element. The pixel drive circuit includes an initialization transistor and a drive transistor, each including a first electrode, a second electrode, and a gate electrode; the first electrode of the initialization transistor is electrically connected to the gate electrode of the drive transistor. The drive transistor provides a drive current to the light-emitting element, the second electrodes of the initialization transistors of at least two sub-pixels are connected to an output terminal of the same switch module. An input terminal of the switch module is electrically connected to an initialization signal terminal. The switch module transfers an initialization signal to the second electrode of the initialization transistor.