Wireless Charging Antenna Shielding for Flicker-Free Display Scanning
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Solution Overview
Problem
Existing electronic devices face challenges in efficiently performing functions of other functional modules while undergoing wireless charging, as the frequency range used for wireless charging can interfere with the display's scanning operation, leading to flicker phenomena.
Innovation Solution
The electronic device incorporates a wireless charging antenna that induces a current in a frequency range adjacent to the scanning operation frequency of the display, with a first flexible printed circuit board and a second flexible printed circuit board connected to the display, and at least one shielding sheet between the wireless charging antenna and the printed circuit boards to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless charging antenna operates in frequency range adjacent to display scanning frequency, then wireless charging efficiency is improved, but display flicker phenomena occurs due to frequency interference
Solution Approach 1:
A shielding sheet is introduced as an intermediary component between the wireless charging antenna and the display to block electromagnetic interference. The shielding sheet selectively attenuates interfering frequency components while allowing the wireless charging signals to pass through, thereby resolving the contradiction between charging efficiency and display stability
Solution Approach 2:
The frequency range of the wireless charging antenna is adjusted to be adjacent to but not overlapping with the display scanning frequency. By changing the operating parameters (frequency) of the wireless charging system, the patent achieves efficient charging while avoiding the harmful interference that causes display flicker
2Reliability
If shielding sheet is added between wireless charging antenna and printed circuit board, then interference with display operation is reduced, but device complexity increases
Solution Approach 1:
The shielding sheet is implemented as a thin, flexible film that can be easily integrated into the existing device structure. This thin-film approach provides effective electromagnetic shielding without significantly increasing device thickness or structural complexity, maintaining display operation stability while minimizing impact on device design
Solution Approach 2:
The shielding sheet is constructed using composite materials that combine electromagnetic shielding properties with flexibility and thinness. These composite materials enable effective interference reduction while keeping the shielding component lightweight and easy to integrate, thereby reducing the overall structural complexity addition
3Adaptability or versatility
If multiple functional modules operate simultaneously during wireless charging, then device versatility is improved, but frequency interference between modules increases
Solution Approach 1:
The shielding sheet serves as a mediator that selectively blocks interfering frequency signals while allowing operational signals to pass. This enables multiple functional modules to operate simultaneously during wireless charging by filtering out only the harmful frequency components that cause interference between modules
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 enhances the efficiency of wireless charging while minimizing its impact on the operation of other functional modules, reducing the likelihood of flicker phenomena and allowing simultaneous operation of multiple functions during charging.
Implementation Method 1
a wireless charging antenna configured to induce a current when proximate to wireless charging signal
Data Source
AI summary
According to certain embodiments, an electronic device comprises: a display configured to perform a scanning operation in a scanning operation frequency range; a battery; a wireless charging antenna configured to induce a current when proximate to wireless charging signal in a frequency range adjacent to the scanning operation frequency range, and wherein the induced current charges the battery; a first flexible printed circuit board disposed between the wireless charging antenna and the battery and connected to the display; a second flexible printed circuit board disposed in parallel with the first flexible printed circuit board; and at least one shielding sheet disposed between the wireless charging antenna and the first printed circuit board.