FPC Pad Pressing Sequence for Precise Display Electrode Alignment
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Solution Overview
Problem
Existing technologies face challenges in precisely pressing flexible printed circuit boards to substrates in display devices, leading to misalignment and tension issues between pad electrodes, which affect contact areas and display performance.
Innovation Solution
A press apparatus and method that utilize a stage, a fixing member with a guide pin and press jig to align and press pad electrodes of a flexible printed circuit board with those of a substrate, ensuring precise alignment and contact by addressing the tension in pad electrode-free areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a flexible printed circuit board is pressed to a substrate, then contact between pad electrodes is achieved, but tension in the pad electrode-free area causes misalignment
Solution Approach 1:
The pressing operation is segmented into two distinct stages: first pressing the pad electrode-free area to eliminate tension and achieve alignment, then pressing the pad electrodes to establish contact. This segmentation resolves the contradiction by addressing alignment and contact as separate sequential operations rather than simultaneous actions.
Solution Approach 2:
The pad electrode-free area is pressed in advance before the pad electrodes are pressed. This preliminary action eliminates tension and establishes alignment beforehand, ensuring that when the pad electrodes are subsequently pressed, they are already properly aligned for reliable contact.
2Reliability
If the flexible printed circuit board is pressed to achieve contact, then electrical connection is established, but misalignment occurs due to tension in pad electrode-free area
Solution Approach 1:
The pressing process is divided into two sequential steps: first pressing the pad electrode-free area to resolve alignment issues, then pressing the pad electrodes to establish contact. This segmentation ensures that alignment is resolved before contact is made, eliminating the trade-off between the two objectives.
Solution Approach 2:
The pad electrode-free area is pressed in advance of the pad electrodes. This preliminary pressing action eliminates tension and establishes proper alignment before the actual contact-making step, ensuring both precision and reliability are achieved in sequence.
3Productivity
If a single pressing operation is applied to the flexible printed circuit board, then both alignment and contact are attempted simultaneously, but tension causes misalignment
Solution Approach 1:
The single pressing operation is segmented into two sequential pressing operations: first pressing the pad electrode-free area for alignment, then pressing the pad electrodes for contact. While this increases the number of steps, it eliminates rework and ensures precision, ultimately improving overall productivity by avoiding failed attempts.
Solution Approach 2:
The pad electrode-free area is pressed in advance to establish alignment before the actual contact operation. This preliminary action prevents misalignment errors that would require rework, thereby improving overall process efficiency and productivity despite the additional step.
Data Source
AI summary
A press apparatus includes: a stage to support a first substrate and a second substrate of a display device; a fixing member to fix a flexible printed circuit board connected with the first substrate onto the second substrate; and a press member to press first pad electrodes of the flexible printed circuit board and second pad electrodes of the second substrate, and the fixing member is configured to press a pad electrode-free area of the flexible printed circuit board. A pressing method of a press apparatus is also provided.