Flexible Circuit Grounding for Display EMC
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Solution Overview
Problem
Conventional display configurations face electromagnetic interference (EMI) issues due to high-power power supplies and limited component selection, leading to electromagnetic compatibility (EMC) problems and radio frequency (RF) sensitivity issues, which hinder mass market introduction and operator approval.
Innovation Solution
The use of a display module with a base member, an emissive component, and a flexible circuit, where the flexible circuit is positioned between the base member and the emissive component, and a conductive cushion surrounds the emissive component, connected to the flexible circuit, to enhance electromagnetic compatibility by acting as a shielding configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-power power supply is placed near the display module with limited components, then power supply capability is improved, but electromagnetic compatibility deteriorates
Solution Approach 1:
A flexible circuit is introduced as an intermediary component between the base member and the emissive component (power supply). This flexible circuit includes a ground plane that acts as a mediator to manage electromagnetic interference, allowing the high-power power supply to be positioned near the display module while maintaining electromagnetic compatibility through the grounding path provided by the flexible circuit.
2Illumination intensity
If display emission is increased to improve display performance, then display quality is improved, but radio frequency sensitivity deteriorates
Solution Approach 1:
The flexible circuit with its ground plane serves as an intermediary shielding structure between the emissive display components and the radio frequency receivers. This mediator provides a controlled impedance path and grounding that reduces electromagnetic coupling, allowing high display emission for quality performance while protecting RF sensitivity by preventing interference paths.
3Object-affected harmful factors
If additional shielding components are added to reduce electromagnetic interference, then electromagnetic compatibility is improved, but device complexity increases
Solution Approach 1:
The flexible circuit is designed to serve multiple functions simultaneously: it provides electrical connections, establishes grounding paths, and acts as an electromagnetic shielding structure. By making the flexible circuit multi-functional, the patent eliminates the need for separate dedicated shielding components, thereby improving electromagnetic compatibility while maintaining simple device structure.
Solution Approach 2:
The electromagnetic shielding function is merged with the flexible circuit that already exists in the display assembly. Instead of adding separate shielding components, the ground plane and conductive elements of the flexible circuit are utilized to provide both electrical connectivity and electromagnetic interference protection, combining multiple functions into a single component.
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
This configuration improves EMC performance by reducing RF-related emissions, allowing for thinner handsets and reduced costs by eliminating the need for additional shielding components, while maintaining display quality and operator approval.
Implementation Method 1
a conductive cushion surrounds the emissive component, connected to the flexible circuit, to enhance electromagnetic compatibility by acting as a shielding configuration
Data Source
AI summary
Disclosed herein is an apparatus. The apparatus includes a display module having a base member, an emissive component, and a flexible circuit. The flexible circuit includes a first end and an opposite second end. The base member is proximate the first end. The emissive component is mounted on the second end. The second end of the flexible circuit is disposed between the base member and the emissive component.