Flexible Display EMI Shielding Tape for Narrow-Bezel Bending
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Solution Overview
Problem
Existing flexible electroluminescent display devices face challenges in reducing bezel area while maintaining display performance and preventing cracks due to bending, and require costly EMI shielding structures with inaccurate position alignment.
Innovation Solution
A flexible display device design incorporating a functional tape with EMI shielding and adhesive functions, applied between a cushion tape and a back plate, to reduce bezel width and improve EMI shielding efficiency at a lower cost, while securing the driver integrated circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a bending area of flexible substrate is used to reduce bezel area, then bezel area is reduced, but cracks may occur in wirings and insulating layers due to bending
Solution Approach 1:
A micro-coating layer is disposed on the bending area of the flexible substrate beforehand to prevent cracks in wirings and insulating layers during bending. This protective layer is applied in advance to cushion the mechanical stress that will occur when the display device is bent, thereby maintaining reliability while enabling bezel reduction through bending.
2Object-affected harmful factors
If EMI shielding structure is added to block electromagnetic interference, then EMI shielding is improved, but position alignment becomes inaccurate and costs increase
Solution Approach 1:
The EMI shielding function is merged with the adhesive tape that is already present in the display device structure. By integrating the EMI shielding layer into the adhesive tape, the patent eliminates the need for a separate EMI shielding component, thereby maintaining accurate position alignment while providing effective electromagnetic interference shielding.
Solution Approach 2:
The adhesive tape is given multiple functions: it serves both as an adhesive element for structural assembly and as an EMI shielding layer. This multi-functionality reduces the number of separate components needed, simplifies the structure, and maintains manufacturing precision while providing comprehensive EMI protection.
3Length of stationary object
If micro-coating layer thickness is minimized for thinness, then display device thickness is reduced, but protective function may be compromised
Solution Approach 1:
The patent optimizes the thickness parameter of the micro-coating layer to achieve the right balance between thinness and protective function. By carefully controlling the thickness parameter within a specific range, the display device maintains reduced overall thickness while the micro-coating layer provides sufficient protection against cracks in the bending area.
Data Source
AI summary
A flexible display device may include a display panel including a display area and a bending area extending from one side of the display area to be bent, a back plate disposed on a rear surface of the display panel, a cushion tape disposed on a rear surface of the back plate, a driver integrated circuit (IC) disposed in a pad portion extending from the bending area, and a functional tape adhered between the cushion tape and the back plate and disposed to face the driver integrated circuit, so that effects capable of improving an EMI shielding function with a low cost, together with an adhesive function, and deriving an optimum efficiency, may be provided.