Display Driving Voltage Slew Rate Control for Communication Noise
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Solution Overview
Problem
Display devices generate interference signals during voltage boosting or dropping, which can negatively impact communication signals received through an antenna, leading to reduced reception rates.
Innovation Solution
A display device and operating method that adjust the frequency and slew rate of the driving voltage based on the reception rate of communication signals, using a processor to generate a driving voltage control signal and a power supply to modify the driving voltage, thereby minimizing noise and enhancing communication signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power supply generates a driving voltage with high slew rate and high frequency to improve driving performance, then the driving capability is improved, but noise interference increases and communication signal reception rate decreases
Solution Approach 1:
The patent applies dynamics by making the slew rate and frequency of the driving voltage adjustable rather than fixed. The power supply dynamically changes these parameters based on operational conditions to balance driving performance and noise reduction. Specifically, the system can switch between high slew rate/high frequency modes (for better driving capability) and low slew rate/low frequency modes (for reduced noise), resolving the contradiction between power performance and noise interference.
Solution Approach 2:
The patent directly applies parameter changes by modifying the slew rate and frequency parameters of the driving voltage. The power supply controller adjusts these electrical parameters to optimize the balance between driving capability and noise generation. By changing the slew rate and frequency parameters dynamically, the system achieves both improved driving performance when needed and reduced noise interference during communication operations.
2Reliability
If the power supply uses fixed high slew rate and high frequency for driving voltage, then driving performance is maintained, but communication reception rate is reduced due to continuous noise interference
Solution Approach 1:
The patent applies periodic action by implementing time-based or condition-based switching between different driving voltage modes. The system periodically adjusts the slew rate and frequency parameters according to operational phases - using high performance modes during display driving phases and low noise modes during communication reception phases. This periodic switching resolves the contradiction by ensuring both driving performance and communication reception are optimized at appropriate times.
Solution Approach 2:
The patent applies feedback by using the communication reception rate as a feedback signal to control the power supply parameters. When communication reception quality deteriorates due to noise, the system detects this through the communication module and feeds back to the power supply controller, which then adjusts the slew rate and frequency to reduce noise. This closed-loop feedback mechanism ensures both reliable driving performance and optimal communication reception.
Data Source
AI summary
A display device includes a display unit including a plurality of pixels for displaying images, a scan driver which supplies scan signals to the plurality of pixels, a data driver which supplies data signals to the plurality of pixels, a communication module which measures a reception rate of communication signals received through an antenna, a processor which compares the reception rate with a reference reception rate and generating a driving voltage control signal, based on a determination result, and a power supply which generates a first driving voltage to be supplied to each of the scan driver and the data driver where the power supply changes at least one of a first slew rate and a first frequency of the first driving voltage, based on the driving voltage control signal, thereby generating a second driving voltage having at least one of a second slew rate and a second frequency.