Flexible Display Panel Cutting Line Layout for Crack Prevention
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Solution Overview
Problem
Existing display devices face issues with stress concentration and potential cracking at the intersection point of flexible connections between the driving chip and pixels, leading to reduced durability.
Innovation Solution
Incorporating a cutting line in the display panel that intersects perpendicularly with fan-out lines, forming a recessed area defined by straight portions, which reduces stress concentration and prevents cracking by allowing the panel to bend without pressing components into the thickness direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a flexible connection is used to connect the driving chip to the pixels, then the area that does not display an image can be reduced, but stress concentration occurs at the bent portion leading to potential cracking
Solution Approach 1:
The patent introduces cutting lines that divide the display panel into separate regions, creating a recessed portion at the intersection of the cutting lines. This segmentation allows the flexible connection to bend without concentrating stress at a single point, as the cutting lines create a structured path that distributes the mechanical stress across multiple segments rather than concentrating it at the bend location.
Solution Approach 2:
The patent adds a vertical dimension by creating a recessed portion that extends in the thickness direction of the display panel. This three-dimensional structure allows the flexible connection to bend horizontally while the recessed portion provides vertical space, preventing the components from being pressed into the thickness direction and reducing stress concentration at the bend point.
2Shape
If the display panel is bent to reduce non-display area, then device compactness is improved, but stress concentration at the intersection point increases
Solution Approach 1:
The cutting lines segment the display panel structure, creating distinct regions separated by the recessed portion. This segmentation allows the panel to maintain a compact bent shape while the cutting lines and recessed portion distribute the stress that arises during bending, preventing stress concentration at the intersection point where the flexible connection bends.
Solution Approach 2:
The cutting lines and recessed portion are formed in advance during the manufacturing process, before the display panel is bent into its final compact shape. This preliminary action creates a pre-configured stress distribution pattern that prevents stress concentration when the panel is subsequently bent, allowing compactness to be achieved without compromising structural integrity.
3Stability of the object's composition
If components are pressed into the thickness direction during bending, then structural integrity is compromised, but preventing this requires additional structural features
Solution Approach 1:
The patent utilizes the thickness direction (vertical dimension) to create a recessed portion that provides space for bending without pressing components into the thickness direction. By employing this third dimension, the solution maintains structural integrity during bending without requiring complex additional structural features, as the recessed portion itself is formed by the cutting lines intersecting.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the durability of the display device by minimizing stress at the intersection point and preventing cracks, thereby improving the overall structural integrity.
Implementation Method 1
forming a cutting line in the display panel by irradiating a light from an intersection point where the first straight portion and the second straight portion intersect
Data Source
AI summary
A display device includes a display panel including a first area in which a pixel is disposed, a second area extending in a first direction, a third area spaced apart from the first area by the second area in a second direction perpendicular to the first direction, and a first cutting line penetrating at least a portion of the display panel and extending from an intersection point formed by a first straight portion included in the first area and a second straight portion included in the second area.