Display Sound Actuator Frequency Control for Cold-Weather Output
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Solution Overview
Problem
Conventional electronic devices with screen sound actuators (SSAs) fail to consider temperature characteristics of ferrofluids, leading to reduced sound pressure output in low-temperature conditions, such as near the polar zone or during midwinter, as the ferrofluid's viscosity increases upon freezing, affecting the SSA's ability to generate vibrations and sounds effectively.
Innovation Solution
An electronic device with a processor that identifies the temperature and controls the actuator to generate vibrations or sounds at a designated frequency if the temperature drops below a certain threshold, using the display as a vibrating plate, thereby maintaining sound pressure output by reducing the viscosity of the ferrofluid through pre-aging operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ferrofluid is used in the SSA without temperature compensation, then the device structure remains simple, but the sound pressure output decreases in low-temperature conditions
Solution Approach 1:
The patent changes the physical parameter of the ferrofluid by controlling its temperature through heating. When the temperature sensor detects low temperature, the processor activates the heater to raise the ferrofluid temperature above its freezing point, thereby maintaining its liquid state and ensuring consistent sound pressure output across different environmental conditions
Solution Approach 2:
The patent replaces potential mechanical solutions (such as mechanical viscosity control mechanisms) with a thermal field approach. By using a heater and temperature sensor to control the ferrofluid temperature, the system achieves viscosity management through thermal energy rather than mechanical means, simplifying the overall device architecture
2Reliability
If the ferrofluid viscosity increases due to low temperature, then the damping action improves, but the sound pressure output through the SSA is reduced
Solution Approach 1:
The patent dynamically adjusts the temperature parameter of the ferrofluid using a heating element controlled by a temperature sensor and processor. When temperature drops below a threshold, the system activates heating to maintain the ferrofluid above its freezing point, ensuring optimal viscosity and sound pressure output across varying operating temperatures
Solution Approach 2:
The patent implements a feedback control loop where a temperature sensor continuously monitors the ferrofluid temperature, and the processor adjusts the heater activation based on this feedback. This closed-loop system ensures the ferrofluid maintains appropriate viscosity by keeping its temperature within the optimal range, thereby consistent sound pressure output
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 solution ensures consistent sound pressure output across varying temperatures, maintaining the functionality of the SSA by normalizing the viscosity of the ferrofluid, thus preventing a decrease in sound output due to temperature changes.
Implementation Method 1
an actuator configured to output at least one of a sound and a vibration by using the display
Implementation Method 2
The ferrofluid may play the role of a bumper, which conducts a damping action when the vibrating plate of the SSA vibrates
Data Source
AI summary
An electronic device is provided. The electronic device includes a display, an actuator configured to output at least one of a sound and a vibration by using the display, and a processor configured to identify whether the display is activated, identify the temperature of the electronic device if the display is activated, and control the actuator to generate at least one of a sound and a vibration at a designated frequency if the temperature is lower than a designated temperature.