LCD Controller Shielding via Flexible Printed Circuit Board
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Solution Overview
Problem
LCD devices face issues with electromagnetic radiation emission from high-speed controllers damaging surrounding elements and disrupting panel operations due to the lack of effective shielding.
Innovation Solution
A flexible printed circuit (FPC) board is designed to be connected to the LCD panel, with a bent portion covering the controller and a metal layer sandwiched between insulating layers to shield electromagnetic radiation and protect against interference, while also being flexible to accommodate the panel's structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a controller with high signal-transmitting speeds is used, then the processing capability and response time of the LCD device are improved, but electromagnetic radiation is generated that damages surrounding elements and disrupts panel operation
Solution Approach 1:
An electromagnetic shielding structure is introduced as an intermediary component between the controller and surrounding elements. This shielding structure, composed of conductive material layers, absorbs and blocks electromagnetic radiation generated by the high-speed controller, preventing it from damaging other components while allowing the controller to maintain its high signal-transmitting speeds
Solution Approach 2:
The electromagnetic radiation generated by the controller, which is initially a harmful factor, is converted into a beneficial effect by using it to enhance the shielding capability. The conductive material layers are designed to interact with the electromagnetic fields, transforming the harmful radiation into a controlled shielding mechanism that protects surrounding elements
2Object-generated harmful factors
If a shielding structure is added to block electromagnetic radiation, then the protection of surrounding elements is improved, but the device complexity and structural profile increase
Solution Approach 1:
The shielding structure is implemented using thin film conductive layers that can be integrated into the existing LCD device structure. These flexible thin films provide effective electromagnetic radiation blocking while maintaining a minimal profile and avoiding significant increases in device complexity
Solution Approach 2:
The shielding structure utilizes composite material layers combining conductive materials with insulating layers. This composite approach provides effective electromagnetic shielding while managing overall structural complexity through optimized material composition rather than adding separate complex shielding 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
The solution effectively shields the controller from electromagnetic interference and radiation, preventing damage to surrounding components and ensuring stable operation of the LCD panel.
Implementation Method 1
a metal layer sandwiched between insulating layers to shield electromagnetic radiation and protect against interference
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel and a flexible printed circuit board electrically connected to the liquid crystal display panel. The liquid crystal display panel includes a first substrate and a controller disposed on the first substrate. The controller is accommodated in a space between the first substrate and the flexible printed circuit board, and is covered by the flexible printed circuit board.