PMOS Buffer Circuit for OLED Drivers With Low Leakage
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Solution Overview
Problem
The challenge lies in mounting both p-channel metal-oxide-semiconductor (PMOS) and n-channel metal-oxide-semiconductor (NMOS) transistors on a display panel for organic light emitting displays, as contemporary buffers are configured with both types, making it difficult and increasing manufacturing costs due to the need for additional processes.
Innovation Solution
A buffer configured solely with PMOS transistors, including specific arrangements of PMOS transistors to prevent leakage currents, allowing for the integration of PMOS transistors on a display panel, thereby reducing manufacturing costs and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both PMOS and NMOS transistors are used in the buffer configuration, then the buffer performance is maintained, but the manufacturing complexity and cost increase due to requiring two different semiconductor types
Solution Approach 1:
The patent applies homogeneity by configuring the buffer using only PMOS transistors, eliminating the need for NMOS transistors. This creates a homogeneous transistor type throughout the buffer circuit, which simplifies the manufacturing process while maintaining the buffer's functional performance through careful circuit design
2Reliability
If both PMOS and NMOS transistors are used in the buffer configuration, then the buffer can operate correctly, but the manufacturing cost increases due to additional manufacturing processes
Solution Approach 1:
The patent uses only PMOS transistors in the buffer configuration, creating a homogeneous structure that can be manufactured using a single semiconductor type. This eliminates the need for separate NMOS manufacturing processes, thereby reducing manufacturing costs while maintaining proper buffer operation through the specialized PMOS circuit design
3Reliability
If conventional buffer configuration with both transistor types is used, then functionality is achieved, but power consumption increases due to leakage current
Solution Approach 1:
The patent configures the buffer using exclusively PMOS transistors, which have inherent characteristics that reduce leakage current compared to conventional CMOS configurations. The homogeneous PMOS structure, combined with specific circuit arrangements, maintains buffer functionality while significantly reducing power consumption by minimizing leakage current
Data Source
AI summary
The present invention provides a buffer and an organic light emitting display that employs the buffer. The buffer is installed in a scan driver or a data driver, which generates scan signals and data signals, respectively, to drive the organic light emitting display. The buffer of the present invention is configured of p-channel metal-oxide-semiconductor (PMOS) transistors, and therefore the scan driver or data driver that includes the buffer can be mounted on a display panel. Various arrangements of the PMOS transistors are proposed for the buffer of the present invention. The buffer of the present invention effectively prevents leakage current that could be generated in the circuit of the buffer.