Flexible Circuit Film Pad Layout for Display Alignment Accuracy
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Solution Overview
Problem
Misalignment between connection pads on a flexible circuit film and display pads on a display panel due to process errors leads to unreliable connections.
Innovation Solution
The display device incorporates a flexible circuit film with connection pads arrayed in a specific direction and inclined with respect to a reference line, featuring measurement and dummy pads to ensure accurate alignment and connection with display pads on the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If connection pads are arrayed in a straight line parallel to the reference line, then the manufacturing process is simple, but misalignment occurs due to process errors
Solution Approach 1:
The connection pads are arranged in an asymmetric inclined configuration rather than a symmetric straight line arrangement. The pads form an inclined line at a specific angle (e.g., 45 degrees) relative to the reference line, which compensates for process errors and misalignment issues that would occur with conventional straight-line arrangements.
Solution Approach 2:
The pad arrangement transitions from a one-dimensional straight line configuration to a two-dimensional inclined configuration. By introducing an angular dimension (inclination angle), the system gains the ability to compensate for linear misalignment errors through geometric orientation rather than relying solely on precise linear positioning.
2Measurement precision
If measurement pads and dummy pads are added to the flexible circuit film, then alignment accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
Measurement pads and dummy pads are pre-configured on the flexible circuit film before the actual connection process. These pads serve as reference markers and compensation elements that are already in place to guide alignment and compensate for errors, rather than attempting to correct misalignment during the connection process itself.
Solution Approach 2:
The measurement pads and dummy pads act as intermediary elements between the flexible circuit film and the display panel. These intermediate pads facilitate precise alignment by providing reference points for measurement and adjustment, mediating the connection process between the two components.
Data Source
AI summary
A display device is provided and includes a display panel including a display area that displays an image and a pad area disposed at least at a side of the display area, and a flexible circuit film electrically connected to the pad area. The flexible circuit film includes connection pads, a first measurement pad, and a second measurement pad. The connection pads are arrayed in a first direction and inclined with respect to a reference line extending in a second direction different from the first direction, the first measurement pad is disposed adjacent to a first side of the connection pads, and the second measurement pad is disposed adjacent to a second side of the connection pads. The connection pads are between the first measurement pad and the second measurement pad.