OLED Pixel Driving Circuit With Capacitive Anti-Coupling Control
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Solution Overview
Problem
The coupling capacitance between data and control signal lines in OLED display panels causes abnormal activation of compensation transistors, leading to display anomalies.
Innovation Solution
Incorporating a first capacitor connected between the control signal line and a high potential line to enhance the anti-coupling capability, stabilizing the control signal and preventing abnormal activation of the compensation transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the data line and control signal line are arranged close together to reduce routing complexity, then the device complexity is reduced, but the coupling capacitance between the lines increases causing display anomalies
Solution Approach 1:
A shielding structure is introduced as an intermediary element between the data line and control signal line. This shielding structure acts as a mediator that blocks the electromagnetic coupling between the two lines, reducing the harmful coupling capacitance while allowing the lines to maintain close spacing for simplified routing.
Solution Approach 2:
The harmful coupling capacitance effect is extracted and isolated by introducing a shielding structure. The shielding structure separates the electromagnetic fields of the data line and control signal line, effectively removing the coupling effect while maintaining the spatial proximity of the lines for routing simplicity.
2Reliability
If the overlap area between data line and control signal line is increased to improve signal coupling for compensation, then the compensation transistor performance is improved, but the coupling capacitance causes abnormal activation of the compensation transistor
Solution Approach 1:
The shielding structure serves as a mediator that allows the data line and control signal line to maintain close proximity and overlap for effective compensation while blocking the harmful coupling capacitance effect. This enables the compensation transistor to function correctly without abnormal activation.
Solution Approach 2:
The shielding structure is applied locally at the overlap area between the data line and control signal line. This localized shielding allows the lines to overlap sufficiently for compensation while preventing coupling capacitance from causing abnormal activation, creating different electromagnetic properties in different spatial regions.
3Device complexity
If no shielding structure is added to simplify the device structure, then the device complexity is reduced, but the coupling capacitance between lines causes display anomalies
Solution Approach 1:
A shielding structure is introduced as a simple intermediary element that resolves the coupling capacitance issue. This additional component, while increasing structure complexity, ensures display stability by blocking electromagnetic coupling between the data line and control signal line.
Solution Approach 2:
The shielding structure provides beforehand protection against coupling capacitance effects. By introducing the shielding structure in advance during design, the patent prevents display anomalies before they occur, ensuring reliable operation under varying signal conditions.
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
Stabilizes the control signal, ensuring the gate potential of the driving transistor remains stable and addresses display anomalies in OLED panels.
Implementation Method 1
a first capacitor, wherein a first plate of the first capacitor is connected to the first control signal line, and a second plate of the first capacitor is connected to a first high potential line
Data Source
AI summary
A display panel and a display device are provided. A pixel driving circuit included in the display panel includes a switch transistor, a driving transistor, a compensation transistor, and a first capacitor which are interconnected. A first electrode of the compensation transistor is connected to a gate of the driving transistor, and a compensation gate of the compensation transistor is connected to a first control signal line. A first plate of the first capacitor is connected to the first control signal line, and a second plate of the first capacitor is connected to a first high potential line.