Chip on Film with Variable Wire Intervals for Flexible Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing chip on film technologies for flexible display devices are limited in size flexibility and result in material wastage and increased costs due to misalignment and the need for frequent reel replacements during panel size changes.
Innovation Solution
A chip on film design with distinct wire regions and adjustable intervals, allowing for flexible electrical connection to display panels of varying sizes, and a manufacturing method that selectively connects pad parts to wire regions based on panel size, enabling partial cutting of the base film to maintain alignment and reduce material loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed wiring pattern is used in chip on film, then manufacturing is simplified, but adaptability to different display panel sizes is limited
Solution Approach 1:
The wire substrate is divided into multiple wiring regions (first wiring region, second wiring region, third wiring region) with different wire intervals. Each region can be selectively used depending on the display panel size, allowing the chip on film to adapt to various panel dimensions without requiring complete redesign of the wiring pattern.
Solution Approach 2:
Different regions of the wire substrate have different wire intervals tailored to specific applications. The first wiring region has a first wire interval suitable for small panels, the second wiring region has a second wire interval for medium panels, and the third wiring region has a third wire interval for large panels. This local differentiation enables adaptability while maintaining a single unified substrate structure.
2Productivity
If reel replacement is performed frequently during manufacturing, then alignment accuracy is maintained, but productivity decreases
Solution Approach 1:
The chip on film substrate is designed with multiple wiring regions that can accommodate different display panel sizes on a single reel. This multi-functionality eliminates the need for frequent reel replacements when switching between different panel sizes, thereby maintaining high productivity while still providing alignment accuracy through the unified substrate structure.
3Reliability
If material is discarded due to misalignment, then connection reliability is ensured, but loss of substance increases
Solution Approach 1:
The chip on film substrate is pre-designed with multiple wiring regions that anticipate different display panel sizes. By preparing the substrate in advance with all necessary wiring configurations, the system eliminates the need to discard materials due to misalignment when panel sizes vary, as the appropriate wiring region can be selected from the pre-configured substrate.
4Adaptability or versatility
If a single wire interval is used, then manufacturing precision is maintained, but adaptability to different panel sizes is reduced
Solution Approach 1:
The wire substrate is segmented into multiple wiring regions, each with optimized wire intervals for specific panel sizes. This segmentation allows the system to maintain manufacturing precision by using the appropriate region for each panel size while simultaneously providing adaptability to different dimensions.
Solution Approach 2:
Instead of varying wire intervals in a single dimension, the patent adds a spatial dimension by creating multiple distinct wiring regions on the same substrate. Each region maintains its own wire interval characteristics, allowing the system to adapt to different panel sizes by selecting the appropriate region without compromising wiring alignment precision.
Data Source
AI summary
A chip on film for a flexible display device is disclosed. In one aspect, the chip on film includes a base film, a semiconductor chip provided to the base film, and a wire part provided to the base film and electrically connected to the semiconductor chip. The wire part includes a first region and a second region connected to the first region, and a first interval between the wires disposed at an outermost of the first region is different from a second interval between the wires disposed at an outermost area of the second region.