OLED Pixel Circuit Leakage Suppression Module for Potential Stability
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Solution Overview
Problem
The potential instability of the control terminal in the driving module of OLED display panels due to leakage currents in the reset and threshold compensation modules affects the display effect, particularly at low refresh rates.
Innovation Solution
Incorporating a leakage suppression module and a storage capacitor connected to the control terminal of the driving module, which reduces the impact of leakage currents by maintaining a stable potential during the light emitting phase, thereby minimizing the cross voltage and leakage current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reset module and threshold compensation module are used in the pixel circuit, then the driving module can be reset and threshold compensated, but leakage currents from these modules cause potential instability in the control terminal during the light emitting phase
Solution Approach 1:
A leakage suppression module is introduced as an intermediary component between the reset module and the control terminal. This module actively suppresses leakage currents from the reset module and threshold compensation module, preventing them from destabilizing the control terminal potential during the light emitting phase, thus resolving the contradiction between functionality and leakage-induced instability
Solution Approach 2:
The harmful leakage current path is extracted and isolated through the leakage suppression module. By separating the leakage current flow from the control terminal, the patent eliminates the harmful effect while preserving the necessary reset and threshold compensation functions of the original modules
2Use of energy by moving object
If the refresh rate is reduced to save energy, then energy consumption is lowered, but the impact of leakage currents on display stability is amplified
Solution Approach 1:
The leakage suppression module acts as a mediator that maintains display stability independent of refresh rate. By actively compensating for leakage currents during the light emitting phase, the module enables lower refresh rates without sacrificing display stability, thus resolving the contradiction between energy saving and stability
3Reliability
If the control terminal potential is made stable to improve display effect, then display quality improves, but additional components are required to suppress leakage currents
Solution Approach 1:
The leakage suppression module is a compact intermediary component that achieves potential stability without requiring a complete circuit redesign. It integrates the functionality of suppressing leakage currents from both the reset module and threshold compensation module, providing stability with minimal additional complexity
Solution Approach 2:
The leakage suppression module serves multiple functions: it suppresses leakage currents from the reset module, compensates for threshold voltage shifts, and maintains control terminal potential stability. This multi-functionality achieves potential stability without proportionally increasing circuit complexity
Data Source
AI summary
Pixel circuit, display panel and display device are provided. The pixel circuit includes a driving module, a data writing module, a first reset module, a threshold compensation module, light emitting control modules, a leakage suppression module, a storage capacitor, a first capacitor, and a light emitting module. A first terminal of the first reset module is electrically connected to a reference signal terminal. A first terminal of the threshold compensation module is electrically connected to a second terminal of the driving module. A control terminal of the driving module is electrically connected to a first node. A second terminal of the first reset module and a second terminal of the threshold compensation module are both electrically connected to the first node through the leakage suppression module. A connection node between the leakage suppression module and the second terminal of the first reset module is a second node.