Display devices
A display device that includes a display element including a light source, and a surface film disposed so as to overlap with the display element and including a thermoplastic elastomer composition, the thermoplastic elastomer composition satisfying conditions (1) and (2) below, and the surface film satisfying conditions (3) and (4) below: (1) The melt flow rate (ASTM D1238, 230° C., 2.16 kg load; MFR) is not less than 30 g/10 min. (2) The type A hardness (momentary value) measured by a method in accordance with JIS K6253 is 60 to 90. (3) The thickness is not less than 300 μm and not more than 2 mm. (4) The total light transmittance measured by a method in accordance with JIS K7361 is 3 to 60%.
1 . A display device comprising a display element including a light source, and a surface film disposed so as to overlap with the display element and comprising a thermoplastic elastomer composition, wherein the surface film has a step at a position where the display element is attached, the thermoplastic elastomer composition satisfying conditions (1) and (2) below, the surface film satisfying conditions (3) and (4) below:
(1) the melt flow rate (ASTM D1238, 230° C., 2.16 kg load; MFR) is not less than 30 g/10 min;
(2) the type A hardness (momentary value) measured by a method in accordance with JIS K6253 is 60 to 90;
(3) the thickness is not less than 300 μm and not more than 1.5 mm;
(4) the total light transmittance measured by a method in accordance with JIS K7361 is 3 to 60%.
2 . The display device according to claim 1 , wherein the thermoplastic elastomer composition is a thermoplastic elastomer composition comprising components (A) to (C) below:
(A) an ethylene/«-olefin copolymer comprising ethylene units and C3-C20 α-olefin units;
(B) a hydrogenated product of a block copolymer comprising at least one block principally comprising conjugated diene monomer units and at least one block principally comprising vinyl aromatic monomer units; and
(C) an olefin resin other than the component (A).
3 . The display device according to claim 2 , wherein the mass ratio ((A)/(B)) of the component (A) to the component (B) is 20/80 to 75/25, and the content of the component (C) is 20 to 150 parts by mass relative to the total of the contents of the component (A) and the component (B) taken as 100 parts by mass.
4 . The display device according to claim 1 , wherein the thermoplastic elastomer composition is a crosslinked thermoplastic elastomer composition.
5 . The display device according to claim 1 , wherein the thermoplastic elastomer composition further comprises a softener (D).
6 . The display device according to claim 1 , wherein the thermoplastic elastomer composition further comprises a polyorganosiloxane (E).
7 . The display device according to claim 1 , wherein the surface film is obtained by injection molding the thermoplastic elastomer composition.
8 . The display device according to claim 1 , wherein the surface film is grained with irregularities including larger irregularities having a height difference of 20 μm to 500 μm and smaller irregularities having a height difference of 1 μm to 10 μm.
9 . The display device according to claim 1 , wherein the surface film has a specular gloss at 60° of not more than 5% as measured by a method in accordance with JIS Z8741.
10 . A vehicle interior member comprising the display device of claim 1 that is incorporated in the vehicle interior member.