Boosting Capacitor in Array Substrate for OLED Brightness
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Solution Overview
Problem
In OLED display devices, parasitic capacitance reduces the voltage stored in storage capacitors, leading to decreased display brightness due to the use of demultiplexers in array substrates, affecting the display effect.
Innovation Solution
The introduction of a boosting capacitor in the array substrate, electrically connected between the control terminal of a transistor and the gate line, increases the control terminal voltage and storage capacitor voltage, enhancing the driving current to the light emitting device, thereby improving display brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If demultiplexers are employed in the array substrate to reduce the number of data drivers, then device complexity is reduced, but the voltage stored in storage capacitors decreases due to parasitic capacitance, leading to reduced display brightness
Solution Approach 1:
The patent introduces a boosting capacitor connected between the control terminal of the driving transistor and the gate line. This capacitor changes the voltage parameter at the control terminal, providing a boosted voltage that compensates for the voltage loss caused by parasitic capacitance in the data line, thereby maintaining display brightness while using demultiplexers
Solution Approach 2:
The patent converts the harmful effect of parasitic capacitance (voltage drop) into a beneficial effect by using the boosting capacitor to generate a positive voltage boost at the control terminal. The voltage boost compensates for and overcomes the voltage loss, turning the problematic parasitic capacitance into an opportunity for enhanced driving capability
2Device complexity
If demultiplexers are used in the array substrate, then the number of data drivers is reduced, but display brightness decreases due to voltage reduction in storage capacitors
Solution Approach 1:
The boosting capacitor changes the voltage parameter at the control terminal of the driving transistor, creating a voltage boost that increases the driving current to the light emitting device. This parameter change directly addresses the power reduction issue while maintaining the demultiplexer structure
Solution Approach 2:
The boosting capacitor acts as an intermediary element between the gate line and the control terminal of the driving transistor. It mediates the voltage transmission by providing additional charge storage and release, thereby enhancing the driving current without requiring additional data drivers
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 boosting capacitor effectively increases the driving current to the light emitting device, enhancing display brightness and uniformity by compensating for the threshold voltage variations of the driving transistors, resulting in improved display performance.
Implementation Method 1
The boosting capacitor may include a first electrode and a second electrode. The first electrode and the second electrode of the boosting capacitor may be electrically connected to a gate line and the first node, respectively. The boosting capacitor may be configured to boost a control terminal voltage of the third transistor and a voltage of the storage capacitor, thereby increasing driving current transmitted to the light emitting device.
Data Source
AI summary
The present disclosure relates to an array substrate. The array substrate may include a pixel unit. The pixel unit may include a third transistor, a sixth transistor, a light emitting device, and a boosting capacitor. The boosting capacitor may include a first electrode and a second electrode. A control terminal, a first terminal, and a second terminal of the third transistor may be electrically connected to a first node, a second node, and a third node, respectively. A control terminal, a first terminal and a second terminal of the sixth transistor may be electrically connected to an emission signal line, a first terminal of the light emitting device, and the second node, respectively. The first electrode and the second electrode of the boosting capacitor may be electrically connected to a gate line and the first node, respectively.