OLED Display Panel Transistor Layout for High-Frequency Driving
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Solution Overview
Problem
Existing OLED display panels face challenges in achieving high-frequency driving due to large subthreshold swing in transistors, which affects the response speed and stability of the display.
Innovation Solution
The display panel incorporates a driver circuit with a first transistor having a smaller subthreshold swing, and a pixel circuit with second and third transistors having larger subthreshold swings, where the first transistor's active layer contains silicon and the third transistor's active layer contains an oxide semiconductor. The panel undergoes dehydrogenation treatment to control hydrogen concentration and optimize subthreshold swing values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same process is used to form transistors in the driver circuit and pixel circuit, then manufacturing simplicity is maintained, but the driver circuit cannot achieve high-frequency driving due to large subthreshold swing
Solution Approach 1:
The patent divides the transistor formation process into two segments: one for driver circuit transistors (using first active layer with smaller subthreshold swing) and one for pixel circuit transistors (using second active layer with larger subthreshold swing). This segmentation allows each circuit to have optimized transistor characteristics for its specific function, enabling high-frequency driving in the driver circuit while maintaining proper operation in the pixel circuit.
Solution Approach 2:
The patent applies local quality by using different active layer materials or structures in different locations of the display panel. The driver circuit region uses a first active layer with smaller subthreshold swing for fast switching, while the pixel circuit region uses a second active layer with larger subthreshold swing for stability. This local differentiation optimizes performance for each circuit's specific requirements.
2Speed
If transistors with large subthreshold swing are used in the driver circuit, then manufacturing simplicity is maintained, but the start of the transistor is delayed and high-frequency driving is not achieved
Solution Approach 1:
The patent segments the transistor fabrication into distinct processes for driver and pixel circuits. The driver circuit transistors are formed with a first active layer designed for fast response, while pixel circuit transistors use a second active layer. This segmentation enables the driver circuit to achieve fast transistor response for high-frequency driving without compromising the overall manufacturing feasibility.
Solution Approach 2:
The patent changes key parameters of the active layer (such as material composition, thickness, or doping concentration) to achieve smaller subthreshold swing in driver circuit transistors. By adjusting these parameters, the transistor response speed is improved for high-frequency operation while maintaining compatibility with existing manufacturing processes.
3Reliability
If transistors with small subthreshold swing are used in the pixel circuit, then high-frequency driving is achieved, but stability and uniformity under low brightness conditions deteriorate
Solution Approach 1:
The patent applies local quality by assigning different transistor characteristics to different circuit regions. In the pixel circuit region, transistors are formed with a second active layer that has larger subthreshold swing, which provides better stability and uniformity under low brightness conditions. This local optimization ensures reliable display performance without requiring fast switching throughout the entire panel.
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 enables faster response speed in the driver circuit for high-frequency driving while maintaining stability and uniformity in the pixel circuit, especially under low brightness conditions, thereby improving the overall display effect.
Implementation Method 1
dehydrogenation treatment is performed on the display panel
Data Source
AI summary
Provided are a display panel and a preparation method thereof, and a display device. The display panel includes a base substrate; a first transistor, a second transistor, a third transistor; and a pixel circuit supplying a drive current to a display element, and a driver circuit supplying a drive signal to the pixel circuit; where the driver circuit includes the first transistor, and the pixel circuit includes the second transistor and the third transistor; and the subthreshold swing of the first transistor is SS1, and the subthreshold swing of the second transistor is SS2, where SS1<SS2.