Shift Register Circuit Reducing Current Consumption
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Solution Overview
Problem
Conventional shift register circuits for liquid crystal and organic EL displays experience increased current consumption due to unnecessary penetration currents flowing through resistors and transistors, regardless of the output signal level, leading to inefficient power usage.
Innovation Solution
A shift register circuit design that includes p-channel transistors with specific configurations, where one of the transistors is always turned off using a combination of signals, preventing current flow between voltage supply sources, and simplifying the manufacturing process by reducing the number of ion implantation steps and masks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If conventional inverter circuits with resistance load type are used in shift register circuits, then the circuit can drive gate lines and drain lines of liquid crystal displays, but unnecessary penetration currents flow through resistors and transistors regardless of output signal level, causing increased current consumption
Solution Approach 1:
The patent extracts and removes the resistor component from the conventional inverter circuit configuration. By replacing the resistance load type inverter with a transistor-based switching circuit, the source of penetration current (the resistor) is eliminated entirely, preventing unnecessary current flow through the circuit regardless of output signal level.
Solution Approach 2:
The patent introduces dynamic control mechanisms using multiple transistors (NT101, NT102, NT103) that can be selectively turned on and off based on clock signals and output signal levels. This dynamic switching ensures that transistors are only conductive when necessary for signal transmission, eliminating static penetration currents that flow continuously in conventional designs.
2Ease of operation
If conventional shift register circuits are used to drive display circuits, then the display can be operated, but the penetration current increases power consumption of the liquid crystal display or organic EL display
Solution Approach 1:
The patent designs the shift register circuit to automatically control its own current flow characteristics through feedback mechanisms. The circuit monitors its own output signal levels and automatically adjusts transistor switching states to prevent penetration current, making the power consumption optimization inherent to the circuit operation rather than requiring external control.
Solution Approach 2:
The patent changes the electrical parameters of the circuit by replacing resistive elements with transistor-based switching elements. This fundamental parameter change transforms the circuit from a resistive load configuration that continuously draws current to a switching configuration that draws current only during active signal transitions, significantly reducing overall power consumption.
Data Source
AI summary
A display capable of reducing the increase in the current consumption is disclosed. The display comprises a shift register circuit having a plurality of first circuit portions connected thereto. Each of the first circuit portions includes a first conductive type first transistor connected to a first voltage supply source, a first conductive type second transistor connected to a second voltage supply source, a first conductive type third transistor connected between the gate of the first transistor and the second potential, a first conductive type fourth transistor connected to the gate of the first transistor and turned on in response to a first signal, and a first conductive type fifth transistor connected between the fourth transistor and the first potential and turned off in response to a second signal when the first signal is for turning on the fourth transistor.