Shift Register Circuit Layout for Noise-Stable Display Driving
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Solution Overview
Problem
Conventional shift register circuits in semiconductor devices suffer from malfunctions due to noise, high power consumption, and characteristic variations, particularly in unipolar transistor-based designs, which affect the stability and reliability of display devices.
Innovation Solution
A semiconductor device with a shift register circuit configuration that includes specific transistor and rectifying element arrangements to stabilize output potentials, reduce noise susceptibility, and minimize power consumption, featuring transistors that can be turned on or off to control signal transmission and reset operations, along with a rectifying element to fix output potentials and reverse bias transistors for reduced threshold shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a unipolar transistor-based shift register circuit is used to simplify the manufacturing process, then manufacturing complexity is reduced and cost is decreased, but the circuit becomes susceptible to noise-induced malfunctions and electromagnetic interference
Solution Approach 1:
A p-channel transistor is introduced as an intermediary component between the n-channel transistor and the output terminal. This p-channel transistor acts as a mediator that receives the bootstrapped high potential from the n-channel transistor and safely transfers it to the output terminal, preventing direct exposure to noise and electromagnetic interference while maintaining the simplified unipolar manufacturing process
Solution Approach 2:
The shift register circuit is divided into multiple stages, with each stage containing separate n-channel and p-channel transistors. This segmentation allows the n-channel transistors to perform bootstrap operations for voltage amplification while the p-channel transistors handle output driving and noise filtering, separating the functions to improve overall reliability without complicating the manufacturing process
2Power
If the output terminal is left floating during non-selection periods to enable bootstrap operation, then voltage potential is not attenuated, but the terminal becomes susceptible to noise and electromagnetic waves
Solution Approach 1:
The p-channel transistor serves as a protective intermediary that connects the output terminal to a fixed potential (either high or low) during non-selection periods. This mediator prevents the output terminal from being directly exposed to noise and electromagnetic waves while maintaining the bootstrap operation capability through the n-channel transistor's voltage amplification
Solution Approach 2:
The p-channel transistor is configured to provide potential stabilization before noise or electromagnetic interference can affect the output terminal. By establishing a fixed potential connection in advance during non-selection periods, the circuit prepares the output terminal to resist subsequent noise-induced malfunctions
3Ease of operation
If transistors are kept ON during non-selection periods to maintain signal transmission capability, then signal continuity is improved, but power consumption increases
Solution Approach 1:
The transistors are dynamically controlled to be ON only during selection periods when signal transmission is required, and OFF during non-selection periods to save power. The p-channel transistor's gate electrode is connected to the output terminal potential, creating a dynamic control mechanism that automatically adjusts transistor states based on operational needs, optimizing the balance between signal continuity and power consumption
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
The proposed solution enables a stable shift register circuit with reduced malfunctions, low power consumption, and minimal characteristic variations, enhancing the reliability and performance of semiconductor and display devices.
Implementation Method 1
a rectifying element which turns ON the first transistor in accordance with electric potential of the input terminal
Implementation Method 2
a second transistor which fixes electric potential of the output terminal by conducting electricity the output terminal and the second terminal in accordance with electric potential of the fourth terminal
Implementation Method 3
a third transistor which fixes electric potential of the third terminal by conducting electricity the third terminal and the second terminal in accordance with the electric potential of the fourth terminal
Data Source
AI summary
To provide a semiconductor device which operates stably with few malfunctions due to noise, with low power consumption, and little variation in characteristics; a display device including the semiconductor device; and an electronic device including the display device. An output terminal is connected to a power supply line, thereby reducing variation in electric potential of the output terminal. In addition, a gate electrode potential which turns ON a transistor is maintained due to the capacitance of the transistor. Further, change in characteristics of the transistor is reduced by a signal line for reverse bias.