Flexible Display Micro Coating Crack Reduction
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Solution Overview
Problem
The challenge in reducing the bezel area of flexible electroluminescence emitting display devices is limited by the need to accommodate wire and driving circuits, and extreme curvature in the bending area leads to cracks in the micro coating layer and increased bezel width, compromising display performance and aesthetics.
Innovation Solution
A flexible display device design that increases the thickness of the cushion tape without increasing the bezel area thickness, featuring a support member with an adhesive, cushion tape, and heat dissipation sheet, which reduces the curvature R value and minimizes defects in the micro coating layer, thereby reducing the bezel width and enhancing impact absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bending area is designed with extreme curvature to reduce the bezel area, then the bezel width is reduced, but cracks occur in the micro coating layer
Solution Approach 1:
The patent adjusts the thickness of the micro coating layer in the bending area to be greater than in other areas. This parameter change allows the bending area to accommodate extreme curvature without cracking, while maintaining a thin profile in non-bending areas to minimize overall bezel width.
Solution Approach 2:
The micro coating layer is designed with different thicknesses in different regions: thinner in non-bending areas and thicker in the bending area. This local quality differentiation ensures that the critical bending region has enhanced crack resistance while other areas maintain optimal thinness for aesthetic purposes.
2Length of moving object
If the micro coating layer thickness is minimized to reduce bezel area, then the device becomes thinner, but cracks and defects occur in the bending area
Solution Approach 1:
The thickness parameter of the micro coating layer is optimized differently for different functional regions. In the bending area, the thickness is increased to prevent cracks, while in non-bending areas, the thickness is minimized to reduce overall device thickness and bezel area.
Solution Approach 2:
Instead of uniformly minimizing thickness across the entire device, the patent introduces spatial variation in the thickness dimension. The micro coating layer transitions from thin in non-bending areas to thick in the bending area, creating a three-dimensional thickness profile that simultaneously achieves thinness and reliability.
3Object-affected harmful factors
If the curvature R value is increased to absorb external impact, then impact absorption improves, but the bezel width increases
Solution Approach 1:
The patent optimizes the curvature radius parameter specifically for the bending area where the micro coating layer is thicker. This localized curvature optimization provides impact absorption capability without requiring the entire bezel to be widened, as the structural reinforcement is concentrated only where needed.
Solution Approach 2:
The bezel area is segmented into a bending area with enhanced micro coating layer and curvature design for impact absorption, and non-bending areas with minimized thickness for aesthetic purposes. This segmentation allows impact absorption functionality to be isolated to specific regions without compromising overall device aesthetics.
Data Source
AI summary
A flexible display device may include a display panel including a display area and a bending area which extends on one side of the display area and is bent, first and second back plates disposed on a rear surface of the display panel, a thin film transistor and a light emitting element disposed on the display area, a circuit wire disposed on the display area and the bending area, a micro coating layer disposed on the circuit wire of the bending area, and a support member disposed between the first and second back plates and constituted by an adhesive and a cushion tape attached to a part of the rear surface of the adhesive, and a heat dissipation sheet attached to the rear surfaces of the cushion tape and the adhesive.