LCD Module FPC Connection Inversion for Reliability
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Solution Overview
Problem
In liquid crystal display modules, the bending of flexible printed wiring (FPC) boards to connect the liquid crystal display panel and the backlight unit can lead to damage at the connection points due to mismatched radii of curvature and external forces, resulting in unreliable electrical connections.
Innovation Solution
The FPC boards are designed to be led out from the same side of the casing, bent to the rear surface, and connected on the outside, with the first FPC board fixed to the casing, allowing for a superposition change that prevents damage and facilitates easy connection without applying external force on the connection point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first FPC board and the second FPC board are bent to the rear surface side of the liquid crystal display module to connect them, then the connection between the liquid crystal display panel and the backlight unit is achieved, but the connection part may be damaged due to contact with the rear surface side of the liquid crystal display module
Solution Approach 1:
The patent inverts the conventional connection approach by connecting the first FPC board and second FPC board on the front surface side of the liquid crystal display module instead of the rear surface side. This inversion allows the FPC boards to be connected before being bent to the rear surface, avoiding damage to the connection part during the bending process and eliminating contact with the rear surface side that could cause damage.
Solution Approach 2:
The patent performs the connection action preliminarily by connecting the first FPC board and second FPC board on the front surface side before bending them to the rear surface side. This preliminary connection ensures that the connection part is already established and protected, preventing damage that would occur if connection were attempted after bending to the rear surface.
2Stability of the object's composition
If both ends of the superposed part of the first FPC board and the second FPC board are in a fixed state, then the structural stability is maintained, but a difference occurs between the radii of curvature when bent, causing load on the connection part
Solution Approach 1:
The patent inverts the sequence of operations by establishing the connection on the front surface side before bending to the rear surface. This inversion allows the connection to be made when both FPC boards are in a stable, accessible position, avoiding the radius of curvature mismatch problem that occurs when attempting to connect after bending to the rear surface where fixed ends create differential curvature.
3Adaptability or versatility
If the first FPC board is wider than the second FPC board, then the driver IC and wiring can be accommodated, but the first FPC board has a strong force to restore itself from a bent state, applying heavy load to the connection part
Solution Approach 1:
The patent performs the connection action preliminarily on the front surface side before bending the FPC boards to the rear surface. By establishing the connection when the first FPC board is still in its flat, stable state rather than after bending, the restoration force that occurs during bending does not affect the connection, preventing load-induced damage while still accommodating the driver IC and wiring on the wider board.
Data Source
AI summary
A liquid crystal display module includes: a liquid crystal display panel; a backlight light source; a casing enclosing the liquid crystal display panel and the backlight light source; a first flexible printed wiring board electrically connected to the liquid crystal display panel and a second flexible printed wiring board connected to the backlight light source, the first flexible printed wiring board and the second flexible printed wiring board being led out from an exit formed in an identical side of the casing to an outside of the casing in a state of being superposed on each other and being bent to a rear surface side of the casing; and a connecting part for electrically connecting the second flexible printed wiring board to the first flexible printed wiring board, the connecting part being formed on the outside of the casing.