Films, light transmitting laminate, cover films and multi-layered electronic devices
Example embodiments relates to a film having excellent mechanical properties with excellent optical properties such as refractive index, haze, yellow index, and the like, light transmitting laminate, use as a cover film, a multi-layered electronic device, and the like comprising the same. The film comprises an elastic layer, the elastic layer has a refractive index of 1.48 to 1.58, a low temperature damage index is a difference of a tensile modulus and a tensile strength at a certain temperature, and the elastic layer has a low temperature index of 1,300 MPa or less.
1. A film for display device comprising:
an elastic layer substantially consisting of PEBA as a resin,
wherein the elastic layer has a refractive index of 1.48 to 1.58,
wherein a low temperature damage index is a difference of a tensile elastic modulus and a tensile strength at a certain temperature, and the elastic layer has the low temperature damage index of 300 MPa or more and 1,300 MPa or less at −40° C.,
wherein the elastic layer has a tensile elastic modulus of 1,200 MPa or less at −10° C., and
wherein the elastic layer has an in-plane retardation Re of 300 nm or less and a haze of 1.2% or less.
2. The film for display device of claim 1 ,
wherein the elastic layer has a storage modulus of 1,500 MPa or less at −40° C.
3. The film for display device of claim 1 ,
wherein a roughness reference value of the film is a larger value between Ra1 as a surface roughness Ra value of one side and Ra2 as a surface roughness Ra value of other side, and
the elastic layer has the roughness reference value of 0.5 μm or less.
4. The film for display device of claim 1 ,
wherein the elastic layer has a thickness direction retardation Rth of 3,000 nm or less and a transmittance of visible light of 85% or more.
5. The film for display device of claim 1 ,
wherein the elastic layer has an elongation of 200% or more at 20° C.
6. A light transmitting laminate comprising a film according to claim 1 .
7. A cover film comprising a film according to claim 1 .
8. The cover film of claim 7 , further comprising:
a glass layer disposed on one side or the other side of the elastic layer,
wherein the glass layer is a tempered glass having a thickness of 200 μm or less.
9. A multi-layered electronic device comprising:
a light emitting functional layer and a film,
wherein the light emitting functional layer has a display area which emits or does not emit light depending on external signals,
the film is according to claim 1 , and
the film is disposed on an upper side or a rear side of the display area.
10. A multi-layered electronic device comprising:
a light emitting functional layer and a film,
wherein the light emitting functional layer has a display area which emits or does not emit light depending on external signals,
the film is according to claim 1 , and
the film is disposed on one side of the light emitting functional layer and covering at least some of the display area.
11. A method of manufacturing a film comprising:
an operating of forming an elastic sheet from a polymer resin comprising an amide or the residue thereof as a repeating unit; and
an operating of letting a first assembly having the elastic sheet disposed on a carrier film pass between rollers to prepare a second assembly comprising the elastic layer disposed on the carrier film; and
thereby manufacturing a film according to claim 1 .