OLED Pixel Circuit Segmentation for Narrow Bezel Design
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Solution Overview
Problem
The existing organic light emitting display devices face challenges with low aperture ratio and increased driver area, making high-speed operation and narrow bezel designs difficult due to the size of the driving circuit and driver area in each pixel.
Innovation Solution
The proposed solution involves a display element with an organic light emitting diode, a driving transistor, and a capacitor, along with additional transistors and voltage lines, which allows for a reduced driver area and increased aperture ratio by using a common gate signal and initialization voltage to control the transistors and capacitor, optimizing the pixel structure for high-speed operation and narrow bezel design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the driving circuit is enlarged to provide sufficient driving capability, then the driving performance is improved, but the aperture ratio decreases and the driver area increases
Solution Approach 1:
The pixel circuit is divided into two separate circuits: a first pixel circuit for normal frame operation and a second pixel circuit for insert frame operation. This segmentation allows each circuit to be optimized for its specific function, reducing the overall area requirement while maintaining driving capability. The first transistor and capacitor form one circuit, while the second transistor and capacitor form another, enabling independent optimization of each path.
Solution Approach 2:
The patent introduces a time dimension by implementing different circuit configurations for different time periods (normal frame vs. insert frame). The first transistor is activated during normal operation while the second transistor remains off, and vice versa for insert frames. This temporal dimensionality allows the system to achieve enhanced driving capability without permanently increasing the spatial area of the driver circuit.
2Speed
If the driving circuit is enlarged to enable high-speed operation, then the operation speed is improved, but the aperture ratio decreases
Solution Approach 1:
The pixel circuit is divided into two separate circuits: a first pixel circuit for normal frame operation and a second pixel circuit for insert frame operation. This segmentation allows each circuit to be optimized for its specific function, reducing the overall area requirement while maintaining driving capability. The first transistor and capacitor form one circuit, while the second transistor and capacitor form another, enabling independent optimization of each path.
Solution Approach 2:
The patent implements dynamic circuit configuration where the first and second transistors are selectively activated based on the frame type. During normal frames, the first transistor conducts while the second remains off; during insert frames, the second transistor conducts while the first remains off. This dynamic switching allows the circuit to adapt its configuration for high-speed operation without permanently increasing the aperture area.
3Area of stationary object
If the driver area is reduced to achieve narrow bezel, then the bezel width is reduced, but the driving capability may be compromised
Solution Approach 1:
The pixel circuit is divided into two separate circuits: a first pixel circuit for normal frame operation and a second pixel circuit for insert frame operation. This segmentation allows each circuit to be optimized for its specific function, reducing the overall area requirement while maintaining driving capability. The first transistor and capacitor form one circuit, while the second transistor and capacitor form another, enabling independent optimization of each path.
Solution Approach 2:
The pixel circuit is designed to perform multiple functions through the same physical components. The first and second transistors, along with their respective capacitors, work together to provide both normal frame driving and insert frame driving capabilities. This multi-functionality allows the reduced-area circuit to maintain full driving capability across different operating modes without requiring separate dedicated circuits for each function.
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
This configuration enhances the aperture ratio and enables high-speed operation while reducing the driver area, thereby achieving a narrow bezel and minimizing the impact of parasitic capacitors, leading to improved display performance.
Implementation Method 1
An organic light emitting display device which has recently attracted a lot of attention as a display device uses a self-emitting organic light emitting diode (OLED)
Data Source
AI summary
The present disclosure relates to a display element comprising an organic light emitting diode including a first electrode and a second electrode, a driving transistor including a first node to be supplied with a data voltage, a second node connected to the first electrode of the organic light emitting diode, and a third node electrically connected to a driving voltage line, a first transistor electrically connected between a data line configured to supply the data voltage and the first node of the driving transistor, a second transistor electrically connected between an initialization voltage line configured to supply an initialization voltage and the second node of the driving transistor, and a capacitor electrically connected between the first node and the second node of the driving transistor.