Display Light Switch Circuit Using Square-Wave Voltage Control
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Solution Overview
Problem
In display apparatuses, continuous input of constant DC voltage to light-emitting devices results in high undesired power consumption.
Innovation Solution
A switch device with a control signal input terminal, a voltage input terminal, a switch circuit, and a voltage output terminal, where the control signal is a square wave signal that controls the output voltage to the light-emitting device, reducing continuous power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If constant DC voltage is continuously input to the light-emitting device, then the light-emitting device can emit light, but power consumption increases
Solution Approach 1:
The patent applies periodic action by using a square wave signal to control the switch circuit, which periodically switches between on and off states. This periodic switching allows the light-emitting device to receive voltage only during the high level periods, reducing continuous power consumption while maintaining light emission functionality. The control signal transitions between first level (off state) and second level (on state) periodically, implementing energy-efficient operation.
Solution Approach 2:
The patent implements dynamics by transitioning from a static constant voltage input to a dynamic switched voltage input. The switch circuit dynamically changes its state based on the control signal, allowing the voltage to the light-emitting device to vary over time. This dynamic control enables the system to adapt between power-saving mode (low level) and light emission mode (high level), resolving the contradiction between energy consumption and emission stability.
2Loss of energy
If constant DC voltage is continuously input to the light-emitting device, then the light-emitting device emits light, but undesired power consumption increases
Solution Approach 1:
The patent introduces a switch circuit as an intermediary component between the voltage source and the light-emitting device. This intermediary component controlled by the square wave signal manages the flow of voltage, allowing the system to reduce undesired power consumption by blocking continuous voltage supply. The switch circuit acts as a mediator that simplifies operation while enabling energy-efficient control through automated periodic switching.
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 switch device effectively reduces power consumption by controlling the voltage output to the light-emitting device using a square wave signal, thereby optimizing energy usage in display apparatuses.
Implementation Method 1
the switch circuit includes a first metal-oxide-semiconductor (MOS) transistor, a second MOS transistor... a gate of the first MOS transistor is electrically connected to a first node, a source of the first MOS transistor is electrically connected to the second input terminal, and a drain of the first MOS transistor is electrically connected to a second node
Data Source
AI summary
A switch device includes: a switch circuit; a control signal input terminal configured to input a control signal to the switch circuit; a voltage input terminal configured to input an initial voltage to the switch circuit; and a voltage output terminal configured to output an output voltage to a light-emitting device. The switch circuit includes: a first input terminal and a second input terminal electrically connected to the control signal input terminal and the voltage input terminal, respectively; and a first output terminal electrically connected to the voltage output terminal.