Inductive Charging Coils Across Display Window for Stylus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current electronic devices with separate pointing devices, such as styli, require charging before use, which can impede their functionality and usability, especially in devices like tablet computers where users must wait for the stylus to charge.
Innovation Solution
An electronic device with inductive charging coils positioned within the enclosure to generate a charging region across the display window, allowing a stylus to be continuously charged and communicate wirelessly while in use, eliminating the need for pre-charging and minimizing power consumption by selectively engaging coils based on the stylus's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stylus is equipped with a battery for operation, then the stylus can function as a pointing device, but the stylus must be charged before use which causes waiting time and reduces usability
Solution Approach 1:
The system performs preliminary charging action by continuously charging the stylus battery when it is near the display device, so that the battery is already charged before the user needs to use the stylus, eliminating waiting time
Solution Approach 2:
The stylus automatically receives charging power from the display device when in proximity, without requiring user intervention to connect charging cables or initiate charging, making the charging process self-service and convenient
2Area of stationary object
If multiple inductive charging coils are used to cover the entire display area, then charging coverage is improved, but power consumption and device complexity increase
Solution Approach 1:
The charging system is divided into multiple independent coil segments that can be independently controlled, allowing only the necessary coils to be activated based on stylus position, reducing overall power consumption while maintaining full coverage capability
Solution Approach 2:
The system dynamically activates or deactivates specific coils based on the real-time position of the stylus, making the charging system adaptive and energy-efficient by only powering the coils that are currently needed
3Power
If inductive charging coils are positioned close to the display window for effective charging, then charging efficiency is improved, but the coils may interfere with display performance and increase device complexity
Solution Approach 1:
The inductive charging coils are merged with the existing display structure, utilizing the space between the display window and backlight, so that the charging function is integrated into the display assembly without requiring separate structural components
Solution Approach 2:
The display structure serves multiple functions: it provides the display function itself and simultaneously houses the inductive charging coils, making the structure universal and eliminating the need for additional dedicated charging components
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
Enables continuous operation of the stylus during use without the need for prior charging, enhances user experience by reducing wait times, and conserves power by only activating necessary coils for charging and communication.
Implementation Method 1
A plurality of inductive charging transmit coils are coupled to the battery and are positioned within the enclosure to generate an inductive charging region that extends through the display window
Data Source
AI summary
An electronic device includes a housing coupled to a display window, a battery and a plurality of inductive charging transmit coils coupled to the battery. The plurality of inductive charging coils are positioned within the enclosure to generate an inductive charging region that extends through the display window and across at least a portion of an exterior of the display window. Sensing circuitry is configured to sense a position of a stylus at the display window and a processor is configured to selectively engage and disengage one or more of the plurality of inductive charging transmit coils based on the sensed position of the stylus. The stylus receives power when it is positioned within the inductive charging window.