PMOS-Only OLED Scan Driver Logic for On-Panel Integration
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Solution Overview
Problem
Conventional scan drivers for OLED displays require both PMOS and NMOS transistors, making it difficult to form them on the display panel, which increases size, weight, and manufacturing costs.
Innovation Solution
A scan driver and logic gate design using only PMOS transistors, where all transistors in the drivers and OR gates are the same type, allowing for integration on the OLED panel and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional scan drivers including both PMOS and NMOS transistors are used, then the scan driver can be formed with standard transistor technology, but it increases device complexity and difficulty of manufacturing on the panel
Solution Approach 1:
The patent applies homogeneity by designing the scan driver to use only one type of transistor (PMOS or only NMOS) instead of mixing PMOS and NMOS transistors. This uniform transistor type simplifies the manufacturing process and reduces device complexity while maintaining the scan driver functionality through specialized circuit configurations
2Weight of stationary object
If scan driver is formed on the OLED panel, then size and weight are reduced, but manufacturing complexity increases due to integration requirements
Solution Approach 1:
By using only one type of transistor throughout the scan driver circuit, the patent simplifies the manufacturing process and enables easier integration onto the OLED panel, thereby reducing the overall size and weight of the display device
3Area of moving object
If scan driver is formed on the OLED panel, then size is reduced, but manufacturing cost increases due to integration complexity
Solution Approach 1:
The patent reduces the area occupied by the scan driver by integrating it directly onto the OLED panel and uses homogeneity (single transistor type) to simplify manufacturing, thereby reducing overall manufacturing costs despite the integration
Data Source
AI summary
A logic gate includes a first driver to receive an input signal, and to control a connection between a first power source and a first node in correspondence with the input signal, a second driver coupled to the first node and a second power source, and to control a voltage of the first node, a third driver to control a connection between an output terminal and the first power source in correspondence with the voltage of the first node, a control transistor to control a connection between the third driver and the second power source, a fourth driver to control a connection between a gate electrode of the control transistor and the second power source, and a second capacitor between a first electrode of the control transistor and the gate electrode of the control transistor, wherein the transistors are a same type of MOS transistor.