Data Driver Amplifier With Integrated Multiplexer for High-Impedance Output
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Solution Overview
Problem
Conventional data driving circuits face limitations in reducing the size of the buffer and quiescent current consumption, while also requiring external switches or multiplexers to achieve high impedance functionality, which increases power consumption and complexity.
Innovation Solution
Incorporating a multiplexer within the amplifier of the data driving circuit, utilizing a folded cascode gain circuit and inverting gain circuit to generate data voltage and control transistor voltages, and including an external multiplexer for feedback and voltage selection, allowing for reduced buffer size and quiescent current consumption while maintaining high impedance functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an external switch or multiplexer is installed outside the buffer to control output and achieve high impedance, then the high impedance function is provided, but the device complexity and power consumption increase
Solution Approach 1:
The patent combines the multiplexer function with the buffer amplifier by integrating the multiplexer inside the amplifier circuit. This merging eliminates the need for separate external switches or multiplexers, thereby reducing device complexity while maintaining the high impedance function. The integrated multiplexer controls the output of the buffer amplifier directly, achieving both output control and high impedance capability within a single unified circuit block.
Solution Approach 2:
The buffer amplifier is designed to perform multiple functions: it acts as both a buffer amplifier and an output switch through the integrated multiplexer. The multiplexer within the amplifier enables the buffer to provide high impedance output when needed, combining the buffering function and switching function into a single multi-functional component, thereby reducing the overall number of components required in the data driving circuit.
2Adaptability or versatility
If an external switch is installed outside the buffer to block output and achieve high impedance, then the high impedance function is provided, but the quiescent current consumption increases
Solution Approach 1:
By merging the multiplexer control function directly into the buffer amplifier circuit, the patent enables the buffer to achieve high impedance state without requiring external switching components. The integrated multiplexer can control the output stage of the buffer to enter high impedance state, eliminating continuous quiescent current consumption that would occur with external switches that remain powered regardless of operational state.
3Area of stationary object
If the buffer size is reduced to minimize circuit area, then the area is reduced, but the output driving capability may be limited
Solution Approach 1:
The patent employs dynamic control of the buffer output through the integrated multiplexer, allowing the buffer to operate in different states (normal driving mode and high impedance mode). This dynamic switching capability enables a compact buffer design that can fully utilize its output driving capability when needed while consuming minimal power in high impedance state, effectively optimizing the trade-off between buffer size and output driving capability.
Data Source
AI summary
A data driving integrated circuit of the present embodiment may include a digital to analog converter configured to change a digital signal into an analog signal and an amplifier configured to receive the analog signal through an input terminal and output a data voltage to a pixel connected to a data line, wherein the amplifier may receive, as feedback, one of a plurality of output signals from a plurality of output terminals.