OLED Display Panel Potential Adjustment Module for Gate Voltage Stability
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Solution Overview
Problem
The instability of the gate voltage in OLED display panels due to electric leakage in double-gate transistors affects the light emitting brightness and display effect, particularly in low-frequency driving pixel circuits, causing display screen shaking.
Innovation Solution
Incorporating potential adjustment modules in the display panel to stabilize the gate voltage by adjusting the potential difference between nodes within a preset range, ensuring a stable driving current for the light emitting module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a double-gate transistor is used in the pixel circuit, then the switching performance is improved, but electric leakage occurs causing gate voltage instability
Solution Approach 1:
The patent introduces a potential adjustment module as an intermediary component between the double-gate transistor and the driving transistor. This module includes a first transistor and a second transistor that work together to adjust the potential at the first node, thereby compensating for the electric leakage effect of the double-gate transistor and stabilizing the gate voltage of the driving transistor without sacrificing the switching performance benefits of the double-gate transistor.
2Reliability
If potential adjustment modules are added to stabilize gate voltage, then display effect is improved, but device complexity increases
Solution Approach 1:
The patent merges the potential adjustment function with the existing transistor structure in the pixel circuit. The first transistor and second transistor are integrated into the circuit in a way that combines their functions with the surrounding components, reducing the overall complexity increase. The adjustment module shares nodes and connections with other circuit elements, avoiding the need for completely separate additional components.
3Power
If the potential difference between first node and second node is increased, then the driving current increases, but leakage current increases causing voltage instability
Solution Approach 1:
The patent dynamically adjusts the potential at the first node through the potential adjustment module to optimize the potential difference between the first node and second node. By changing the potential parameter of the first node rather than the second node, the circuit maintains an optimal balance between driving current and leakage current, ensuring both sufficient power delivery and voltage stability during the light emitting phase.
Data Source
AI summary
Disclosed are a display panel, a driving method of the display panel, and a display device. A switching module of a pixel circuit in the display panel includes a first transistor and a second transistor. A second electrode of the first transistor is electrically connected to a first electrode of the second transistor at a first node. A second electrode of the second transistor is electrically connected to a gate electrode of a driving transistor at a second node. The driving transistor is configured to provide a driving current for a light emitting module according to a potential of the second node in a light emitting phase. An input end of each potential adjustment module is electrically connected to the second node of one pixel circuit, and an output end of each potential adjustment module is electrically connected to the first node of at least one pixel circuit.