Amplifier Circuit Using MOS Capacitance Difference for Low Power Display Drive
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing amplifier circuits for display devices face challenges in reducing power consumption while maintaining a wide range of display voltage signals, which increases the power consumption of external drive circuits due to high voltage requirements and large driving capacity.
Innovation Solution
The proposed amplifier circuit uses a MOS transistor with a pulse-driven MOS capacitance to amplify signals by leveraging the difference in capacitance between the ON and OFF states, allowing for efficient amplification of display voltage signals with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wide range of display voltage signal is used to enhance contrast and brightness, then display quality is improved, but power consumption of external drive circuit increases
Solution Approach 1:
The external drive circuit is divided into two parts: a low-power digital-to-analog converter (DAC) that generates a small voltage range signal, and an on-chip amplifier circuit that boosts the signal to the required wide voltage range. This segmentation allows the power-consuming amplification to occur locally at the display chip rather than in the external drive circuit, thereby reducing external power consumption while maintaining high display quality.
Solution Approach 2:
The invention moves the amplification function from the external drive circuit domain to the internal display chip domain. By integrating the amplifier circuit within the display chip, the system transforms the power consumption problem from an external issue to an internal issue, allowing the external drive circuit to operate at low power while the internal amplifier handles the high voltage range requirements.
2Use of energy by moving object
If common inversion drive or sub-capacitor drive is used to reduce display signal voltage, then power consumption is reduced, but display voltage range is limited
Solution Approach 1:
The amplifier circuit uses dynamic control of MOS transistor capacitance values during the amplification process. By dynamically adjusting the capacitance values in response to the input signal, the circuit achieves high amplification gain while maintaining the ability to output a wide voltage range, thus overcoming the limitations of static drive methods like common inversion drive.
Solution Approach 2:
The invention changes the capacitance parameters of MOS transistors dynamically during operation. By controlling the capacitance values of the MOS transistors in the amplifier circuit, the system can achieve both low power consumption and wide voltage range output, resolving the trade-off between power consumption and voltage range adaptability.
3Use of energy by moving object
If amplifier circuit is integrated into display device, then power consumption is reduced and voltage range is expanded, but circuit complexity increases
Solution Approach 1:
The amplifier circuit is designed to be self-contained within the display chip, using only standard thin-film transistor processes that are already available in modern display manufacturing. The circuit uses the display chip's own power supply and control signals, eliminating the need for additional external components or complex interconnections, thus minimizing the increase in overall system complexity.
Solution Approach 2:
The amplifier circuit is designed with a universal structure that can be integrated into various types of display devices using standard thin-film transistor processes. By using multi-functional MOS transistors that can operate in different capacitance modes, the circuit achieves high amplification gain, wide voltage range, and low power consumption simultaneously, making it adaptable to different display applications without requiring custom circuit designs.
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 solution effectively amplifies display voltage signals with lower power consumption by utilizing the MOS transistor's capacitance difference, expanding the voltage range and reducing power requirements, making it suitable for integration into display devices.
Implementation Method 1
A pulse is applied to a gate or a drain and a source of the MOS transistor. And the MOS transistor is turned from ON to OFF during change in the pulse over time. The amplifier circuit amplifies the signal through the use of difference in the MOS capacitance between ON state and OFF state.
Data Source
AI summary
A signal sampled by a sampling transistor is amplified with low power consumption. A display voltage signal Vsig sampled by the sampling transistor is amplified by an amplifier circuit of this invention. A thin film transistor T1 which functions as a MOS capacitance is connected to a signal line DL to which the display voltage signal Vsig is outputted. A voltage boosting pulse VP1 is applied to a gate of the thin film transistor T1. And the thin film transistor T1 is switched from ON to OFF during change in the rising pulse. The amplifier circuit amplifies the signal through the use of difference between the gate capacitance of the thin film transistor T1 in ON state and the gate capacitance of the thin film transistor T1 in OFF state.