Rollable Display Power Switching for Stable Wireless Charging
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Solution Overview
Problem
Rollable electronic devices with flexible displays face challenges in maintaining stable electrical connections and power supply due to the deformation of flexible printed circuit boards, which can be either too rigid for flexibility or too flexible for stable wiring, and require large driving power for mechanical movement.
Innovation Solution
Implementing a wireless charging function in the electronic device to stabilize power transmission through flexible printed circuit boards and prevent power loss by supplying power to the power supply and driving circuits using a battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness or line width of the conducting line in the flexible printed circuit board is increased to provide stable electrical connection, then the electrical connection stability is improved, but the flexibility of the flexible printed circuit board deteriorates
Solution Approach 1:
The flexible printed circuit board is divided into a first flexible printed circuit board and a second flexible printed circuit board. The first FPCB has thicker conducting lines for stable electrical connection, while the second FPCB has thinner conducting lines for flexibility. This segmentation allows each part to optimize for its specific function, resolving the contradiction between connection stability and flexibility.
2Adaptability or versatility
If the thickness or line width of the conducting line is reduced to secure flexibility, then the flexibility is improved, but the stability of electrical wiring deteriorates
Solution Approach 1:
The flexible printed circuit board is divided into a first flexible printed circuit board and a second flexible printed circuit board. The first FPCB has thicker conducting lines for stable electrical connection, while the second FPCB has thinner conducting lines for flexibility. This segmentation allows each part to optimize for its specific function, resolving the contradiction between connection stability and flexibility.
3Adaptability or versatility
If a wiring structure is implemented using a flexible printed circuit board to provide transmission path for charging power, then the wireless charging function is enabled, but the power transmission stability deteriorates due to limited power transmission capacity
Solution Approach 1:
The flexible printed circuit board is divided into a first flexible printed circuit board and a second flexible printed circuit board. The first FPCB has thicker conducting lines for stable power transmission to the driving device, while the second FPCB handles other electrical connections. This segmentation allows the first FPCB to provide sufficient power transmission capacity while maintaining overall system flexibility.
4Reliability
If connectors are arranged in the rollable device to provide wired connection, then the connection stability is improved, but the arrangement becomes difficult due to interference with the rollable display
Solution Approach 1:
The patent replaces the mechanical wired connection system (connectors and cables) with a wireless charging system using electromagnetic induction. This substitution eliminates the need for physical connectors that would interfere with the rollable display, while still providing stable power transmission through the flexible printed circuit board to the driving device.
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
Stable power transmission is achieved through flexible printed circuit boards with limited capacity, and power loss is prevented by wireless charging, ensuring reliable operation of the electronic device.
Implementation Method 1
supplying power to the power supply and driving circuits using a battery
Implementation Method 2
Implementing a wireless charging function in the electronic device to stabilize power transmission
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An electronic device according to various embodiments of the present disclosure comprises: a first housing; a second housing arranged to be slidably movable with respect to the first housing; a rollable display which is at least partially arranged in the second housing, and which is extended or shrunk on the basis of the sliding-in or sliding-out of the second housing; a motor driving unit for generating power for sliding-in or sliding-out the second housing; a battery for supplying a power source to the electronic device; a first circuit board having a power supply circuit of the electronic device; a second circuit board electrically connected to the battery; a flexible printed circuit board for electrically connecting the first circuit board and the second circuit board; a wireless charging unit for receiving power from the outside; a switching element for switching between a first state in which the battery is electrically connected to the power supply circuit or the motor driving unit and a second state in which the electrical connection between the battery and the power supply circuit or the motor driving unit is cut off; and at least one processor. The at least one processor can be configured to: confirm the voltage of the first circuit board and the output voltage of the battery; and output, to the switching element, a signal related to the switching operation between the first state and the second state on the basis of the confirmed voltage of the first circuit board and output voltage of the battery. Other various embodiments are possible.