Source Driver Equalizer Tuning for Display Signal Interference
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Solution Overview
Problem
Interference between the operating frequency bands of a source driving chip in a display device and a wireless network communication device, such as a wireless router, leads to abnormal display screens due to signal interference.
Innovation Solution
A source driving chip with an equalizer that includes an adjustable unit for adjusting the cutoff frequency, comprising base resistors and capacitors, and a logic circuit to control sub-resistor and sub-capacitor switches, reducing interference by aligning the frequency bands of the target signal with the external signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source driving chip operates at a fixed frequency band, then the display device can maintain stable display performance, but the wireless router signal interferes with the display signal causing abnormal display screens
Solution Approach 1:
The patent applies dynamics by making the equalizer parameters adjustable rather than fixed. The equalizer includes adjustable resistors and capacitors that can dynamically change the cut-off frequency to adapt to different wireless signal environments, resolving the contradiction between stable display operation and interference from wireless devices
Solution Approach 2:
The patent changes the parameters of the equalizer circuit by introducing adjustable resistors and capacitors. The logic circuit modifies the resistance and capacitance values to adjust the cut-off frequency, allowing the display device to adapt to different wireless signal frequencies and reduce interference while maintaining display stability
2Device complexity
If the equalizer uses fixed base resistors and capacitors, then the circuit structure remains simple, but the cut-off frequency cannot be adjusted to avoid interference with wireless signals
Solution Approach 1:
The equalizer transitions from a static circuit with fixed components to a dynamic circuit where resistors and capacitors can be adjusted. The logic circuit controls switches to change the resistance and capacitance values, enabling the cut-off frequency to adapt to different wireless signal environments while maintaining a relatively simple overall structure
Solution Approach 2:
The equalizer circuit is segmented into multiple adjustable units, each with its own resistor and capacitor combinations. This segmentation allows independent adjustment of different frequency parameters, providing flexibility in frequency band adaptation while keeping each individual adjustment module relatively simple
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 interference by ensuring the frequency bands of the target signal and external signal overlap less, enhancing the reliability of signal transmission and display quality.
Implementation Method 1
an equalizer for obtaining a to-be-processed signal output from the timing controller and filtering the to-be-processed signal according to a cut-off frequency to output a target signal in the to-be-processed signal
Data Source
AI summary
A source driving chip and a display module are provided. The source driving chip is electrically connected between a timing controller and a display panel in the display module, an equalizer in the source driving chip is configured to obtain a to-be-processed signal output from the timing controller and filter the to-be-processed signal according to a cut-off frequency to output a target signal in the to-be-processed signal, the source driving chip is configured to drive the display panel for display according to the target signal, and the equalizer includes an adjustable unit for adjusting the cut-off frequency, thereby reducing interference between a target signal output from the source driving chip and a current external signal, and improving reliability of mutual transmission.