Anti-interference Signal Line for Display Panel Noise Reduction
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Solution Overview
Problem
Conventional display panels experience noise interference due to capacitance coupling effects from switching signals, which degrade user experience and interfere with touch signal detection in active areas.
Innovation Solution
An anti-interference display panel is designed with an anti-interference signal line that includes equivalent resistors and capacitors matching those on the switching signal line, allowing the anti-interference signal to reverse voltage changes relative to the switching signal, thereby counterbalancing interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If switching signals are transmitted through signal lines to control the display panel, then the display panel can be driven with reduced source driving chips, but noise interference is generated in the active area due to capacitance coupling effect
Solution Approach 1:
An anti-interference signal line is introduced as an intermediary component between the switching signal line and the active area. This signal line carries an anti-interference signal that acts as a mediator to counterbalance the noise interference caused by the switching signal, thereby reducing the harmful capacitance coupling effect without affecting the driving functionality
Solution Approach 2:
The patent converts the harmful capacitance coupling effect into a beneficial mechanism by utilizing the same capacitive coupling property to transmit the anti-interference signal. The anti-interference signal line, having similar capacitance characteristics to the switching signal line, allows the anti-interference signal to be coupled to the active area in a way that counteracts the original noise interference
2Device complexity
If switching signals are transmitted through signal lines to control the display panel, then the display panel can be driven with reduced source driving chips, but touch signal detection is interfered in the active area
Solution Approach 1:
The anti-interference signal line serves as a dedicated intermediary that separates the driving function from the sensing function. By transmitting a separate anti-interference signal that counterbalances the switching signal's interference, the system protects touch signal detection in the active area while maintaining the simplified driving architecture
Solution Approach 2:
The anti-interference signal is transmitted in advance and continuously counteracts the noise interference from the switching signal before it can affect touch signal detection. This preliminary anti-action ensures that the active area remains free from interference during both driving and sensing operations
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 anti-interference signal line effectively reduces interference in the active area by dynamically matching resistance and capacitance, improving image display and touch signal detection by counterbalancing pulse signals caused by switching signals.
Implementation Method 1
driving a plurality of switching signals needed by the multiplexer causes interference to an active area of the display panel by means of a capacitance coupling effect
Data Source
AI summary
An anti-interference display panel includes a source driving chip, a switching signal line, a multiplexer, and an anti-interference signal line. The source driving chip is configured to generate a data signal. The switching signal line is configured to transmit a switching signal. The multiplexer is configured to receive the data signal and the switching signal, and is configured to output the data signal according to the switching signal. The anti-interference signal line is configured to transmit an anti-interference signal. An equivalent resistor and an equivalent capacitor are formed on the anti-interference signal line, and resistance of the equivalent resistor is approximate to resistance of a load resistor coupled to the switching signal line, and capacitance of the equivalent capacitor is approximate to capacitance of a load capacitor coupled to the switching signal line. A voltage of the anti-interference signal falls when a voltage of the switching signal rises, and rises when the voltage of the switching signal falls.