Level Shifter Power Reduction via Oscillator Pulse Control
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Solution Overview
Problem
Conventional liquid-crystal display devices with built-in memory consume significant power due to the constant operation of level shifters, even when displaying still images, as they require high-amplitude enable signals to shut down thin-film transistors, leading to increased power consumption.
Innovation Solution
An image display device with a shutdown function for level shifters, where the oscillator circuit outputs a pulse to control the enable signal for the first level shifter, which in turn controls the shutdown of a group of second level shifters, reducing overall power consumption by using the oscillator circuit's pulse as an enable signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If level shifters operate constantly to provide high-amplitude enable signals for shutting down thin-film transistors, then the shutdown function is achieved, but power consumption increases
Solution Approach 1:
The level shifters operate periodically rather than continuously. The oscillator circuit generates periodic pulses that trigger the level shifters to activate only when needed (during image display updates), allowing them to remain in a low-power state during still image display. This periodic operation maintains the shutdown functionality while significantly reducing overall power consumption.
Solution Approach 2:
The system uses its own internal oscillator circuit to generate the timing signals that control the level shifters, eliminating the need for external control signals. The level shifters are automatically activated by the oscillator's output pulses, making the system self-regulating and reducing the need for additional power-consuming control circuitry.
2Use of energy by moving object
If level shifters are shut down to reduce power consumption, then power usage decreases, but the ability to control thin-film transistors is compromised
Solution Approach 1:
The level shifters are designed to activate periodically based on oscillator pulses rather than remaining continuously active. During still image display, they remain shut down to save power, but automatically activate when the oscillator generates a pulse during image updates, ensuring control capability is maintained when needed without continuous power consumption.
Solution Approach 2:
The oscillator circuit is designed to generate pulses in advance of when the level shifters need to operate. This preliminary action ensures that the level shifters are activated exactly when needed for image display updates, maintaining reliable control of thin-film transistors while minimizing unnecessary operation during still image periods.
Data Source
AI summary
The present invention provides an image display device that is capable of reducing the power consumption. The total power consumption of a level shifter is reduced by using a pulse of an oscillator circuit as an enable signal of a level shifter for amplifying the enable signal to be supplied to a group of level shifters. The image display device includes an oscillator circuit, a first level shifter, and a plurality of second level shifters, which are mounted on a substrate and formed with thin-film transistors. The plurality of second level shifters each has a shutdown function for reducing the power consumption of the level shifters. The shutdown function of the first level shifter is controlled by an output pulse of the oscillator circuit. The shutdown function of the group of second level shifters is controlled by an output pulse of the first level shifter.