Flexible display device

Abstract

A flexible display device including a flexible display panel, a flexible outer member disposed on the flexible display panel, and an adhesive member disposed between the flexible display panel and the flexible outer member. An elastic modulus of the adhesive member is from about 1/1000000 to about 1/1000 of an elastic modulus of each of the flexible display panel and the flexible outer member.

What is claimed is: 
     
         1 . A flexible display device comprising:
 a flexible display panel;   a flexible outer member disposed on the flexible display panel; and   an adhesive member disposed between the flexible display panel and the flexible outer member,   wherein, when the flexible display device is bent, stress is applied to the adhesive member so as to at least partially decouple a first neutral plane formed in the flexible display panel and a second neutral plane separate from the first neutral plane formed in the flexible outer member.   
     
     
         2 . The flexible display device of  claim 1 , wherein the elastic modulus of the adhesive member is from 1/1000000 to 1/1000 of an elastic modulus of each of the flexible display panel and the flexible outer member. 
     
     
         3 . The flexible display device of  claim 2 , wherein:
 a compressive stress applied to the first neutral plane is substantially equal to a tensile stress applied to the first neutral plane; and   a compressive stress applied to the second neutral plane is substantially equal to a tensile stress applied to the second neutral plane.   
     
     
         4 . The flexible display device of  claim 3 , wherein the flexible outer member comprises a protective member disposed on a non-display surface of the display panel, the non-display surface opposing the display surface. 
     
     
         5 . The flexible display device of  claim 3 , wherein the elastic modulus of the adhesive member is in a range of 0.01 MPa to 1 MPa. 
     
     
         6 . The flexible display device of  claim 3 , wherein the elastic modulus the adhesive member is in a range of 0.01 MPa to 1 MPa, at a temperature of in a range of −45° C. to 90° C. 
     
     
         7 . The flexible display device of  claim 6 , wherein:
 the adhesive member comprises a pressure sensitive adhesive sheet that comprises a polymer, a cross-linking agent, and a resin; and   the polymer comprises an acryl-based polymer, a silicon-based polymer, a urethane-based polymer, or any combination thereof.   
     
     
         8 . The flexible display device of  claim 5 , wherein an elastic modulus of the flexible display panel is in a range of 1 GPa to 10 GPa. 
     
     
         9 . The flexible display device of  claim 5 , wherein the elastic modulus of the flexible outer member is in a range of 2 GPa to 7 GPa. 
     
     
         10 . The flexible display device of  claim 1 , wherein the flexible display device is configured to bend.