Flexible Circuit Board Pad Placement for Digitizer Alignment
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Solution Overview
Problem
Display devices face misalignment and interference issues between digitizers and flexible circuit boards, which can lead to detachment and operational problems.
Innovation Solution
The design includes a display panel with a digitizer having openings for wirings that are disconnected, and a first flexible circuit board with connection pads on long sides electrically coupled to these wirings, preventing misalignment and interference by positioning connection pads only on the long sides, while a second flexible circuit board is connected to the sensor and spaced apart from the first circuit board's protruding portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If connection pads are disposed on both long sides and short sides of the flexible circuit board, then more wirings can be connected, but misalignment between the digitizer and flexible circuit board occurs
Solution Approach 1:
The patent applies local quality by strategically positioning connection pads only on the long sides of the flexible circuit board while excluding them from the short sides. This selective distribution optimizes the spatial arrangement to prevent misalignment with the digitizer's opening while maintaining necessary electrical connections.
2Volume of moving object
If the flexible circuit board is positioned close to the sensor, then space is saved, but interference between the flexible circuit board and sensor occurs
Solution Approach 1:
The patent introduces an intermediary approach by positioning the flexible circuit board at a specific distance from the sensor, creating spatial separation that prevents electrical interference while still maintaining compact device architecture. The arrangement ensures the flexible circuit board does not overlap with the sensor's active area.
3Adaptability or versatility
If the digitizer has an opening for the sensor, then the sensor can be accessed, but the wirings in the digitizer become disconnected
Solution Approach 1:
The patent applies segmentation by dividing the wiring connection function across multiple components: the digitizer maintains its opening for sensor access, while the flexible circuit board provides separate connection pads to re-establish electrical connectivity. This modular approach allows the sensor to be accessible without compromising wiring integrity.
Data Source
AI summary
A display device may include a display panel including a display area and a non-display area in a periphery of the display area, a digitizer under the display panel, the digitizer having a first opening, a first wiring extending in a first direction and disconnected at the first opening, and a second wiring extending in a second direction crossing the first direction and disconnected at the first opening, a sensor under the display panel and in the first opening, and a first flexible circuit board under the sensor, the first flexible circuit board including a long side extending in the second direction, a short side crossing the long side, a first connection pad on the long side and electrically coupled to the first wiring, and a second connection pad on the long side and electrically coupled to the second wiring.