Semiconductor Device Negative Feedback Transistor Power
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Solution Overview
Problem
Semiconductor display devices with transistors of the same polarity face issues of increased power consumption and reduced potential output amplitude due to transistors being normally on, leading to wasted current and decreased efficiency.
Innovation Solution
A circuit design where the source terminal of an output-side transistor is supplied with potentials through different wirings than another transistor, allowing for electrical isolation of the gate and source, enabling negative feedback to turn off the transistor even when normally on, thereby reducing power consumption and maintaining output amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If transistors of the same polarity are used in semiconductor display devices, then cost is reduced and productivity is improved, but power consumption increases and output amplitude decreases due to transistors being normally on
Solution Approach 1:
The patent applies negative feedback by connecting the gate of the transistor to its own drain through a feedback wiring. When the transistor is normally on and current flows, the drain potential changes, which feeds back to the gate to adjust the gate voltage and turn off the transistor, thereby reducing power consumption while maintaining the use of same-polarity transistors
Solution Approach 2:
The feedback wiring acts as an intermediary element that mediates between the drain and gate of the transistor. It transmits the potential change from the drain to the gate, enabling the transistor to self-regulate its state without requiring additional control circuitry, thus reducing power consumption while keeping the manufacturing simple
2Ease of manufacture
If transistors of the same polarity are used, then manufacturing cost is reduced, but output amplitude decreases due to wasted current when transistors are normally on
Solution Approach 1:
The negative feedback mechanism ensures that when the transistor is normally on, the feedback from drain to gate adjusts the gate voltage to turn off the transistor, eliminating wasted current and maintaining proper output amplitude while still using cost-effective same-polarity transistors
3Reliability
If channel width is increased to improve current supply capability, then transistor can drive more loads, but wasted current increases when transistor is normally on
Solution Approach 1:
The feedback mechanism allows transistors with larger channel widths to be used for improved current supply capability, while the feedback automatically turns off the transistor when it should be off, preventing the wasted current that would otherwise result from the larger channel width
Data Source
AI summary
A semiconductor device that includes transistors having the same polarity consumes less power and can prevent a decrease in amplitude of a potential output. The semiconductor device includes a first wiring having a first potential, a second wiring having a second potential, a third wiring having a third potential, a first transistor and a second transistor having the same polarity, and a plurality of third transistors for selecting supply of the first potential to gates of the first transistor and the second transistor or supply of the third potential to the gates of the first transistor and the second transistor and for selecting whether to supply one potential to drain terminals of the first transistor and the second transistor. A source terminal of the first transistor is connected to the second wiring, and a source terminal of the second transistor is connected to the third wiring.