Display Driving Circuit Voltage Control for Ceramic Capacitor Noise
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Solution Overview
Problem
Multi-layered ceramic capacitors in display devices generate vibration noise due to piezoelectric properties, causing audible frequencies that irritate users, especially when used in voltage generators for electronic devices like display panels.
Innovation Solution
A display device with a driving circuit that compares image signals to ripple patterns, adjusts the voltage level of the analog driving voltage, and outputs a voltage control signal to minimize the vibration noise caused by the multi-layered ceramic capacitor in the voltage generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layered ceramic capacitor is used in the voltage generator to generate internal power supply voltage, then the power supply voltage can be generated stably, but vibration noise is generated due to piezoelectric properties of the ceramic material
Solution Approach 1:
The patent changes the voltage level parameter of the analog driving voltage dynamically. When ripple image patterns are detected, the voltage level is decreased to minimize vibration noise from the multi-layered ceramic capacitor, while maintaining stable power supply voltage generation under normal conditions
Solution Approach 2:
The driving circuit compares the image signal to ripple image patterns and outputs voltage control signals based on the comparison result. This feedback mechanism allows the system to detect when vibration noise is generated and automatically adjust the voltage level to suppress the noise while maintaining stable operation
2Object-generated harmful factors
If the voltage level of analog driving voltage is decreased to minimize vibration noise, then vibration noise is reduced, but power supply capability may be affected
Solution Approach 1:
The patent makes the voltage level dynamic rather than fixed. The voltage level is adjusted according to the operating conditions - decreased when ripple patterns are detected to reduce vibration noise, and maintained at normal levels when not to ensure adequate power supply capability
Solution Approach 2:
The voltage level adjustment is performed periodically or in response to detected ripple patterns. The system alternates between normal voltage operation and reduced voltage operation based on the presence of image patterns that cause vibration noise
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 effectively reduces the vibration noise and electromagnetic noise by decreasing the voltage level of the analog driving voltage, minimizing the irritation caused by the noise and improving the user experience.
Implementation Method 1
The reason may be that the ferroelectric material has piezoelectricity and electrostriction. Such vibration may be transferred from a terminal electrode of the multi-layered ceramic capacitor toward a substrate.
Implementation Method 2
The reason may be that the ferroelectric material has piezoelectricity and electrostriction.
Implementation Method 3
The driver circuit is configured to compare the image signal to ripple image patterns and is configured to output the voltage control signal to change a voltage level of the analog driving voltage, according to the result of the comparison.
Data Source
AI summary
A display device including a display panel, including a plurality of pixels, a driver circuit configured to display an image on the display panel in response to an image signal and a control signal, and a voltage generator configured to generate an analog driving voltage for an operation of the driver circuit in response to a voltage control signal. The driver circuit is configured to compare the image signal to ripple image patterns and is configured to output the voltage control signal to change a voltage level of the analog driving voltage, according to the result of the comparison.