Display Driver Circuit With Schottky-Gate Transistors for Low Power
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Solution Overview
Problem
Existing display device drivers face challenges in reducing power consumption while maintaining efficient signal transmission and stable operation.
Innovation Solution
The driver incorporates a CMOS circuit design with transistors having a double gate structure, where the semiconductor material forms a Schottky or ohmic contact with the gate terminals, allowing for adjusted threshold voltages and increased output current, thereby reducing the number of buffer transistors and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the driver uses conventional transistor designs with single gate structures, then the device area is smaller and manufacturing is simpler, but the output current is insufficient and more buffer transistors are needed, increasing power consumption
Solution Approach 1:
The gate terminal is divided into two separate gates (first gate and second gate) that can be independently controlled. This segmentation allows independent optimization of threshold voltage and output current, enabling the transistor to achieve higher performance without requiring additional buffer transistors, thus reducing power consumption while maintaining manageable device complexity
Solution Approach 2:
The patent applies parameter changes by independently adjusting the voltages applied to the first and second gates. By changing these voltage parameters, the threshold voltage and output current of the transistor can be optimized to reduce power consumption. The dual-gate structure enables flexible parameter adjustment that single-gate transistors cannot achieve
2Reliability
If the driver increases the number of buffer transistors to maintain signal levels, then signal transmission reliability is improved, but the device area increases and power consumption increases
Solution Approach 1:
By independently controlling the voltages on the first and second gates, the transistor's output current can be enhanced to reliably drive subsequent stages without adding buffer transistors. This parameter optimization maintains signal transmission reliability while avoiding the area increase that would result from adding more transistors
3Speed
If the driver uses oxide semiconductor transistors with fast turn-on operation, then switching speed is improved, but threshold voltage control and output current stability become more challenging
Solution Approach 1:
The segmented gate structure allows separate optimization of switching speed and threshold voltage control. One gate can be optimized for fast switching while the other maintains stable threshold voltage, resolving the trade-off between speed and control stability that plagues oxide semiconductor transistors
Solution Approach 2:
Independent voltage control of the two gates enables dynamic adjustment of both switching speed and threshold voltage. This parameter flexibility allows the transistor to achieve fast turn-on operation while maintaining stable threshold voltage control, overcoming the limitations of conventional oxide semiconductor transistors
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 design reduces power consumption and dead space in the display device by optimizing transistor performance through adjusted threshold voltages and increased output current, while maintaining efficient signal transmission.
Implementation Method 1
the semiconductor material forms a Schottky contact with the gate terminals, allowing for adjusted threshold voltages and increased output current
Implementation Method 2
Each of the input circuit and the inverter includes a first transistor and a second transistor connected to each other... a gate terminal of the second transistor is electrically connected to a semiconductor material spaced apart from the active area of the second transistor
Data Source
AI summary
A driver is disclosed that includes an input circuit that transmits an input signal to a first node in response to at least one of a clock signal and an inverted clock signal, and an inverter that generates an output signal based on a voltage of the first node. Each of the input circuit and the inverter includes a first transistor and a second transistor connected to each other, an active area of the first transistor and an active area of the second transistor include different materials, and a gate terminal of the second transistor is electrically connected to a semiconductor material spaced apart from the active area of the second transistor.