Backlight Module Wireless Power via Magnetic Induction
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Solution Overview
Problem
The backlight module for LCDs faces challenges in compacting its volume due to the complexity of circuit layout, particularly with the use of LED light bars, driving circuits, and power lines, which hinders further miniaturization and increases design costs.
Innovation Solution
The implementation of a magnetic field induction system between coils to transmit electricity wirelessly, reducing the need for physical circuit connections and allowing for a more compact design by using a first coil to generate a magnetic field, a second coil to induce voltage, and a rectifying circuit to convert this voltage into driving voltage for the light emitting unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional circuit layout with connectors and power lines is used, then electrical connection is reliable, but the volume of backlight module increases and design complexity increases
Solution Approach 1:
The patent replaces the mechanical electrical connection system (connectors, power lines, traces) with a wireless magnetic field induction system. The first coil generates a magnetic field that induces voltage in the second coil, eliminating the need for physical electrical connections between the driving circuit and light emitting unit, thereby reducing volume and circuit layout complexity
Solution Approach 2:
The patent introduces magnetic field as an intermediary medium to transmit energy between the driving circuit and light emitting unit. The first coil converts electrical energy to magnetic field energy, which then induces electrical energy in the second coil, serving as a non-contact energy transmission intermediary that simplifies the overall circuit structure
2Illumination intensity
If more circuit components and power lines are added for LED backlight, then lighting function is improved, but the volume compaction becomes more difficult
Solution Approach 1:
The patent merges the driving circuit and light emitting unit into a more integrated structure by using magnetic field induction for power transmission. The first coil is integrated with the driving circuit and the second coil with the light emitting unit, allowing closer integration and reduced spacing requirements, thus enabling volume compaction while maintaining lighting function
Solution Approach 2:
The patent transitions from planar circuit layout to three-dimensional magnetic field-based energy transmission. By utilizing the spatial relationship between the first and second coils through magnetic field induction, the system allows for more flexible spatial arrangement and vertical integration, enabling compact design in the Z-direction while maintaining adequate illumination
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 approach effectively reduces the volume of the backlight module, simplifies the circuit layout, and lowers design costs by eliminating the need for direct electrical connections between the driving circuit and the light emitting unit, while providing flexibility in the placement of coils.
Implementation Method 1
The first driving circuit is electrically connected to the first coil for controlling the first coil to produce a first magnetic field. The second coil is disposed on a transmission direction of the first magnetic field corresponding to the first coil for receiving the first magnetic field and providing a first induction voltage according to the first magnetic field.
Data Source
AI summary
A backlight module is provided, which includes a first coil, a first driving circuit, a second coil, a rectifying circuit and a light emitting unit. The first driving circuit is electrically connected to the first coil for controlling the first coil to produce a first magnetic field. The second coil is disposed on a transmission direction of the first magnetic field corresponding to the first coil for receiving the first magnetic field and providing a first induction voltage according to the first magnetic field. The rectifying circuit is electrically connected to the second coil for converting the first induction voltage into a first driving voltage. The light emitting unit is electrically connected to the rectifying circuit to provide a backlight according to the first driving voltage.