Foldable Digitizer Grounding Structure for Magnetic Noise Shielding
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Solution Overview
Problem
Exposure of electronic components in electronic devices without ground can cause current noise, affecting the operation of other components, especially in foldable devices with flexible displays.
Innovation Solution
A magnetic shielding structure is integrated into the electronic device to reduce exposure of electronic components, using reinforcing plates and a conductive material to provide a ground connection and minimize noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive material is disposed on the rear surface of the digitizer panel to function as ground, then the electronic component can operate with stable electric potential, but the exposed portion without ground increases and causes current noise
Solution Approach 1:
The patent extends the ground connection from the rear surface of the digitizer panel to the side surfaces, creating a three-dimensional ground network. This dimensional extension ensures that even areas not covered on the rear surface have access to ground through lateral pathways, eliminating exposed portions that would generate noise.
Solution Approach 2:
The patent introduces intermediate conductive structures (such as conductive adhesives or conductive frames) that bridge the gap between the digitizer panel and the housing or other ground references. These intermediaries provide ground paths to areas where direct rear-surface grounding is not feasible, preventing noise generation.
2Adaptability or versatility
If gap space is required to dispose various constituent elements, then the device can accommodate multiple components, but the exposed portion without ground increases and affects other electronic components
Solution Approach 1:
The housing structure is designed to serve multiple functions: it provides mechanical support, accommodates various components through integrated gaps and cavities, and simultaneously acts as a ground reference. The conductive material on the housing serves both structural and electrical grounding functions, eliminating noise issues while maintaining design flexibility.
Solution Approach 2:
The grounding system is segmented into multiple zones corresponding to different component areas. Each gap or cavity in the housing is associated with its own ground path, allowing independent grounding of different regions without interfering with component placement flexibility.
3Manufacturing precision
If free space is required to secure surface quality of display module, then the display can maintain flatness, but the exposed portion without ground increases and generates noise
Solution Approach 1:
Instead of extending ground coverage only in the planar dimension (which would compromise surface flatness), the patent utilizes the vertical dimension by providing ground connections through the thickness of the housing and from the sides. This allows the front surface to remain flat while exposed portions on the rear or sides are still grounded through lateral and vertical pathways.
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 magnetic shielding structure effectively reduces noise interference from exposed components, ensuring stable operation of electronic devices with flexible displays.
Implementation Method 1
a conductive material may be disposed on a rear surface of a digitizer panel that recognizes an input of a pen by using an electromagnetic resonance phenomenon, and this conductive material may function as a ground of the digitizer panel
Implementation Method 2
A magnetic shielding structure is integrated into the electronic device to reduce exposure of electronic components, using reinforcing plates and a conductive material to provide a ground connection and minimize noise interference
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
An electronic device according to various embodiments disclosed in this document comprise: a housing including a first housing, a second housing rotatably connected to the first housing; a side member constituting the lateral side exterior of the electronic device and formed of a conductive material; a digitizer panel including a first region, a second region adjacent to the side member, and a third region between the first region and the second region, and disposed in the first housing and the second housing; a reinforcing plate which is positioned to correspond to the first region of the digitizer panel and supports the digitizer panel and is formed of a conductive material; a magnet member disposed at a position corresponding to the second region of the digitizer panel; and an intermediate member positioned to correspond to the second region and the third region of the digitizer panel, formed of a conductive material, and electrically connected to the reinforcing plate. Various other embodiments are possible.