Integrated Flexible Circuit Board for Portable Display Signal Transfer
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Solution Overview
Problem
The complexity of portable display apparatuses is increased due to the need for additional flexible printed circuit boards to connect and supply electrical energy to light source devices in dual type flat panel display devices, which also poses risks of dislocation from heat generated during soldering processes.
Innovation Solution
An integrated flexible printed circuit board that simultaneously transfers electrical signals to both the light source device and the main display panel, eliminating the need for an additional circuit board and reducing the length of the third substrate portion, thereby simplifying terminal formation and preventing dislocation of the light source device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional flexible printed circuit board is used to connect the light source device, then the light source device can be supplied with electrical energy, but the structure of portable display apparatus becomes complicated
Solution Approach 1:
The patent combines the function of the first flexible printed circuit board (which transfers signals to the main display panel) with the function of the additional flexible printed circuit board (which supplies electrical energy to the light source device). By integrating these two separate circuit boards into one unified board, the patent eliminates the need for an additional component while maintaining both signal transfer and power supply functions, thus reducing structural complexity without compromising reliability
Solution Approach 2:
The integrated flexible printed circuit board is designed to perform multiple functions simultaneously: it transfers electrical signals from the printed circuit board to the main display panel and also supplies electrical energy to the light source device. This multi-functional design allows a single component to replace what would traditionally require separate components, thereby simplifying the overall apparatus structure while ensuring proper electrical connectivity for both display and backlight functions
2Reliability
If an additional flexible printed circuit board is used to connect the light source device, then electrical signals can be transferred to the light source device, but the number of flexible printed circuit boards increases
Solution Approach 1:
The patent merges the signal transfer function and power supply function into a single flexible printed circuit board. The integrated board contains separate conductive pathways that independently handle signal transmission to the main display panel and power delivery to the light source device, effectively combining what would traditionally require two separate boards into one unified component, thereby reducing the quantity of flexible printed circuit boards from two to one
3Reliability
If soldering process is used to connect the light source device, then electrical connection is established, but heat generated causes dislocation of the light source device
Solution Approach 1:
The integrated flexible printed circuit board is designed with a dedicated mounting region for the light source device that is spatially separated from the high-density signal routing areas. This segmentation allows the light source device to be positioned in a distinct zone where soldering operations can be performed with reduced thermal interference from other components, thereby maintaining positioning precision while establishing reliable electrical connections
Solution Approach 2:
The flexible printed circuit board acts as an intermediary element between the rigid printed circuit board and the light source device. This flexible intermediate layer provides thermal isolation during the soldering process, as the flexible material has different thermal properties compared to rigid substrates, thereby reducing heat transfer to the light source device and preventing dislocation while still enabling effective electrical connection
Data Source
AI summary
The present invention relates to a dual type flat panel display device and a flexible printed circuit board that is integrated to simultaneously transfer electric signals to both of a light source device and a main display panel. According to one aspect of the present invention, the first flexible printed circuit board includes a first substrate portion, a second substrate portion, a third substrate portion, and a connection substrate portion. The first substrate portion is connected to a main display panel. The second substrate portion is disposed between the main display panel and a backlight unit, and is connected to the first substrate portion. The second substrate portion includes a light source device to transmit light into the backlight unit. The third substrate portion is disposed between the backlight unit and the printed circuit board, and is connected to the printed circuit board. The connection substrate portion connects the second substrate portion to the third substrate portion. The integrated flexible printed circuit board will make it possible to manufacture more compact portable display apparatus.