Foldable Film Package Layout for Wider Display Connectivity
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Solution Overview
Problem
Current chip-on-film (COF) package technologies face challenges in increasing the effective width of film packages, which limits their application in miniaturized, thinned, and lightweight electronic devices without compromising manufacturing reliability and efficiency.
Innovation Solution
The proposed film package design includes a flexible film substrate with penetrating vias, interconnection patterns, and a semiconductor chip connected via flip-chip bonding, featuring input and output pads arranged to extend from the edges of the substrate, allowing for increased effective width through foldable and bendable structures, and additional protective layers for enhanced protection and connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the substrate width is increased to widen the effective width of the film package, then the effective width is improved, but the device size and weight increase
Solution Approach 1:
The patent utilizes the third dimension (vertical stacking) by arranging input pads, first output pads, and second output pads on different surfaces and heights of the semiconductor chip. This allows the effective width to be increased without expanding the substrate area, as multiple pad groups are stacked vertically to connect with different regions of the display panel.
Solution Approach 2:
The patent embeds multiple pad groups within the vertical profile of the semiconductor chip structure. The input pads, first output pads, and second output pads are nested at different heights and positions on the chip, allowing dense integration of connectivity functions without increasing the horizontal footprint of the package.
2Area of stationary object
If the substrate width is increased to widen the effective width of the film package, then the effective width is improved, but the device dimensions increase
Solution Approach 1:
The patent transitions from horizontal expansion to vertical arrangement by positioning pad groups at different heights on the semiconductor chip. The input pads, first output pads, and second output pads are distributed across multiple vertical levels, enabling the effective width to be widened without increasing the substrate width.
Solution Approach 2:
The patent employs a flexible film substrate that can be bent and folded to achieve a compact three-dimensional configuration. This flexibility allows the substrate to accommodate the vertically arranged pad groups while maintaining a small horizontal footprint, effectively widening the functional width without increasing the physical substrate dimensions.
3Adaptability or versatility
If more interconnection patterns and pads are added to increase connectivity, then the connectivity is improved, but the device complexity increases
Solution Approach 1:
The patent divides the connectivity functions into distinct segments: input pads for signal input, first output pads for intermediate connections, and second output pads for final output. This segmentation allows each pad group to be independently optimized and connected to specific regions of the display panel, improving overall connectivity while maintaining clear functional organization.
Solution Approach 2:
The patent resolves complexity by arranging multiple pad groups in the vertical dimension rather than spreading them horizontally. By stacking input pads, first output pads, and second output pads at different heights on the semiconductor chip, the design achieves high connectivity with reduced lateral complexity and more efficient space utilization.
Data Source
AI summary
A film package includes a film substrate, vias penetrating through the film substrate, interconnection patterns on the film substrate, and a semiconductor chip electrically connected to at least one of the interconnection patterns and to the vias, wherein the interconnection patterns include input patterns, first output patterns, and second output patterns, the film package includes input pads on a surface of the film substrate, and the input patterns extend from the input pads, the film package includes first output pads positioned toward a first edge of the film substrate on a first surface of the film substrate, and the first output patterns extend from the first output pads, and the film package includes second output pads positioned toward a second edge of the film substrate on a second surface of the film substrate opposite to the first surface, and the second output patterns extend from the second output pads.