OLED Pixel Circuit Coupling Regulation for Low-Frequency Flicker
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Solution Overview
Problem
Existing OLED display panels suffer from screen flickering due to current leakage, which becomes more pronounced during low-frequency displays, and current solutions like using IGZO transistors complicate manufacturing and increase production costs.
Innovation Solution
A display panel design that includes a pixel circuit with a control circuit, a drive circuit, and a regulating circuit. The regulating circuit adjusts the potential of the control node through a coupling effect, using regulation capacitors and an initial power signal to stabilize the gate potential of drive transistors, thereby reducing current leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IGZO transistors are used to reduce current leakage, then screen flickering is reduced, but manufacturing complexity increases and production costs rise
Solution Approach 1:
The patent changes the electrical parameters of the existing transistor by introducing a regulating circuit that dynamically adjusts the gate potential. This allows the conventional transistor to achieve stable operation without requiring IGZO material, thus reducing manufacturing complexity while maintaining reliability
Solution Approach 2:
The regulating circuit acts as an intermediary between the power supply and the drive transistor gate. It uses regulation capacitors and control nodes to mediate the potential stability, achieving current leakage reduction without changing the transistor material or structure
2Ease of manufacture
If conventional transistors are used, then manufacturing is simple, but current leakage causes screen flickering during low-frequency displays
Solution Approach 1:
The regulating circuit implements a feedback mechanism where the control node potential is continuously adjusted based on the drive power signal. This feedback loop compensates for current leakage effects in real-time, preventing screen flickering while keeping the transistor structure simple for easy manufacturing
Solution Approach 2:
The regulation capacitors are pre-configured in the circuit to provide potential stabilization before current leakage effects can cause visible flickering. The initial power signal and regulation capacitors work together to cushion against potential fluctuations during low-frequency operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively alleviates screen flickering by stabilizing the potential at the control node and reducing current leakage, while also simplifying the manufacturing process and reducing production costs, making it suitable for mass production.
Implementation Method 1
a regulating circuit coupled respectively to the drive power line, the control node, and an initial power line and configured, through a coupling effect, to regulate the potential of the control node based on an initial power signal provided by the initial power line and the drive power signal
Data Source
AI summary
Disclosed are a display panel and a display device. The pixel circuit in the display panel includes a control circuit, a drive circuit, and a regulating circuit. The control circuit controls the potential of the coupled control node based on the gate drive signal provided by the gate line and the data signal provided by the data line. The drive circuit drives the light-emitting element to emit light based on the potential of the control node and the drive power signal provided by the drive power line. The regulating circuit adjusts the potential of the control node through the coupling effect based on the drive power signal and the initial power signal provided by the initial power line.