Display Panel Impedance Regulation Circuit for EMI Reduction
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Solution Overview
Problem
Display panels generate electromagnetic interference (EMI) that can disrupt the performance of nearby electronic devices, particularly in integrated systems like onboard displays, where this interference can cause significant performance degradation or failure.
Innovation Solution
A display panel design incorporating a gate drive circuit with cascaded shift registers, impedance regulation circuits with transistors, and a control module that adjusts the impedance of these circuits to modify the scanning pulse signal waveform, reducing EMI by controlling the turn-on and turn-off of transistors and adjusting gate voltage to achieve optimal EMI performance according to specific standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the display panel uses conventional gate drive circuits with shift registers to generate scanning pulse signals, then the display function is achieved, but electromagnetic interference is generated that disrupts nearby electronic devices
Solution Approach 1:
An impedance regulation circuit is introduced as an intermediary component between the shift register and the scanning line. This circuit includes transistors that regulate the impedance of the scanning pulse signal, thereby reducing electromagnetic interference while maintaining the display function. The intermediary circuit acts as a buffer that modifies the signal characteristics to minimize harmful emissions.
Solution Approach 2:
The impedance regulation circuit dynamically adjusts the impedance parameter of the scanning pulse signal by controlling the on/off state of transistors. By changing the impedance parameter, the circuit reduces the amplitude and sharpness of the scanning pulse signal, which in turn reduces electromagnetic interference generated by the display panel.
2Object-generated harmful factors
If the impedance of the scanning pulse signal is reduced to minimize electromagnetic interference, then EMI is reduced, but the signal strength may be insufficient to drive the display effectively
Solution Approach 1:
The impedance regulation circuit uses periodic control signals to switch transistors on and off in a timed sequence. This periodic action allows the circuit to regulate impedance during specific phases of the scanning pulse signal while maintaining sufficient signal strength during other phases, thereby balancing EMI reduction with display driving capability.
Solution Approach 2:
The impedance regulation circuit dynamically adjusts the impedance of the scanning pulse signal in real-time based on the operating conditions. By making the impedance adjustable rather than fixed, the circuit can optimize the balance between reducing electromagnetic interference and maintaining sufficient signal strength to drive the display effectively.
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 minimizes electromagnetic interference by adjusting the impedance of scanning pulse signals, thereby reducing conduction and radiation interference, ensuring optimal performance of electronic devices with varying EMI requirements while maintaining display effectiveness.
Implementation Method 1
The control module is electrically connected to the plurality of impedance regulation circuits and configured to adjust impedance of the at least one transistor in the each of the plurality of impedance regulation circuits
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a gate drive circuit, a plurality of impedance regulation circuits and a control module. The gate drive circuit includes a plurality of cascaded first shift registers. The plurality of cascaded first shift registers are electrically connected to a plurality of scanning lines in one to one correspondence; and the plurality of impedance regulation circuits are in one-to-one correspondence with the plurality of scanning lines. Each of the plurality of impedance regulation circuits is in series connection between a first shift register corresponding to the each of the plurality of impedance regulation circuits and a scanning line corresponding to the each of the plurality of impedance regulation circuits. The each of the plurality of impedance regulation circuits includes at least one transistor.