Display Connector Resonance Control for EPI EMI Reduction
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Solution Overview
Problem
Existing display apparatuses face electromagnetic interference (EMI) issues due to synchronization between the embedded point-to-point interface (EPI) frequency and the parasitic resonance frequency of connectors, limiting design freedom and increasing manufacturing costs.
Innovation Solution
Incorporating a parasitic resonance control circuit that varies the parasitic value of connectors through a controller, using varactor diodes or field effect transistors to control parasitic resonance frequencies and magnitudes, and employing a sensing or non-sensing type controller to manage noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connector length is fixed without resonance control, then the manufacturing process is simple, but electromagnetic interference occurs due to synchronization between EPI frequency and parasitic resonance frequency
Solution Approach 1:
The patent changes the parasitic parameters (capacitance and inductance) of the connector by introducing controllable electronic components (varactor diodes or FETs) that can dynamically adjust the resonant frequency of the connector, thereby avoiding synchronization with the EPI frequency and reducing EMI
Solution Approach 2:
The patent transforms the static connector into a dynamic system by incorporating controllable components that can adjust the parasitic resonance characteristics in real-time, allowing the connector to adaptively avoid resonance frequencies that cause EMI
2Reliability
If fixing tapes or subsidiary materials are used to control resonance, then EMI is reduced, but manufacturing cost increases
Solution Approach 1:
The patent replaces mechanical fixing methods (fixing tapes, physical constraints) with electronic control mechanisms (varactor diodes, FETs) that can achieve resonance control through electrical signals, eliminating the need for additional mechanical components and reducing manufacturing complexity
3Reliability
If the connector length is adjusted to avoid resonance, then EMI is reduced, but design freedom is limited
Solution Approach 1:
The patent enables dynamic adjustment of the connector's resonant characteristics, allowing the same physical connector to adapt to different frequency requirements through electronic control, thereby maintaining design freedom while avoiding EMI
Solution Approach 2:
The patent allows adjustment of electrical parameters (capacitance, inductance) of the connector to change its resonant frequency, providing design flexibility without requiring physical modifications to the connector structure
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
Minimizes EMI by unsynchronizing the EPI frequency with parasitic resonance frequencies, allowing greater design flexibility and reducing manufacturing costs by eliminating subsidiary materials like fixing tapes.
Implementation Method 1
a first parasitic resonance control circuit including a varactor diode where a capacitance varies
Implementation Method 2
a second parasitic resonance control circuit including a field effect transistor (FET) operating as a resistor in a deep triode region
Implementation Method 3
a sensing type which senses a voltage from a conductor disposed at a periphery of the connector to obtain a sensing value
Data Source
AI summary
A display apparatus includes a first circuit board where a timing controller is disposed, a connector connected to the first circuit board, a second circuit board connected to the first circuit board, based on the connector, a controller disposed on the first circuit board to output a control signal, and a parasitic resonance control circuit configured to vary a parasitic value of the connector, based on the control signal output from the controller.