Crack Prevention Layer in Bending Area Display
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Solution Overview
Problem
The existing touchscreen display devices face issues with cracking in the bending area due to bending stress, which can lead to defects and malfunctions in the active display area, complicating the manufacturing process and increasing costs.
Innovation Solution
A display device with a crack prevention layer made of organic insulation material in the bending area, alleviating bending stress and preventing cracks from spreading to the active area, while also incorporating a passivation layer, touch sensor, and routing lines to enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel is bent to place non-display area on the rear surface, then the active area is maximized, but the bending area easily cracks due to bending stress
Solution Approach 1:
A crack prevention layer is formed in the bending area before the display device is assembled and put into service. This layer acts as a cushioning element that absorbs and distributes bending stress, preventing cracks from forming or propagating in the bending area when the display panel is flexed to maximize the active area.
Solution Approach 2:
The crack prevention layer is formed using an organic insulation material that is distinct from the surrounding inorganic insulation layers. This composite material approach allows the bending area to have different mechanical properties - specifically, the organic material provides flexibility and stress absorption capability while maintaining electrical insulation, thus resolving the contradiction between maximizing active area through bending and preventing cracks in the bending region.
2Reliability
If a crack prevention layer is added to prevent cracking, then crack resistance is improved, but the device structure becomes more complex
Solution Approach 1:
The crack prevention layer is formed using an organic insulation material that serves multiple functions: it provides crack prevention in the bending area, maintains electrical insulation between conductive layers, and contributes to the overall structural integrity of the display device. By combining multiple functions into a single layer, the patent avoids increasing device complexity while still improving crack resistance.
3Reliability
If additional layers are added to the display structure, then functional performance is improved, but manufacturing cost increases
Solution Approach 1:
The crack prevention layer is integrated into the existing insulation layer structure of the display device. Rather than adding a completely separate component, the organic insulation material is formed as part of the routing line structure, merging the crack prevention function with the existing electrical insulation and signal transmission functions. This integration approach minimizes additional manufacturing steps and costs while achieving the desired crack prevention effect.
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 effectively prevents cracking in the bending area, thereby preventing defects and malfunctions in the active display area, simplifying the manufacturing process and reducing costs by addressing the stress caused by bending.
Implementation Method 1
the crack prevention layer alleviates bending stress caused by bending of the substrate
Data Source
AI summary
A display device prevents cracks from spreading to an active area. The display device includes a substrate including an active area and a non-active area having a bending area, a thin-film transistor disposed in the active area, a light-emitting element disposed in the active area and connected to the thin-film transistor, an encapsulation layer disposed on the light-emitting element, a touch sensor disposed on the encapsulation layer, a touch pad disposed in the non-active area, a first routing line connecting the touch sensor to the touch pad via a second routing line in the bending area, and a crack prevention layer disposed on the second routing line in the bending area. Thus, the crack prevention layer is capable of preventing the occurrence of cracks in the bending area BA, thus preventing cracks from spreading to the active area AA.