Protective sheet, display unit, and electronic apparatus
View Patent ↗A display unit includes a display panel and a first protective sheet. The display panel has a light-emitting surface. The first protective sheet is provided on the light-emitting surface. The first protective sheet provided in the display unit includes a first impact dispersion layer, a first strain relaxation layer, and a gel-like first impact absorption layer. The first impact dispersion layer has a pencil hardness of 3H or higher. The first strain relaxation layer has flexural strength and tensile strength both higher than the flexural strength and the tensile strength of the first impact dispersion layer. The gel-like first impact absorption layer has a thickness of a submillimeter order or more. The first impact absorption layer, the first strain relaxation layer, and the first impact dispersion layer are arranged in this order from the light-emitting surface.
1. A display unit comprising:
a display panel having a light-emitting surface; and
a first protective sheet provided on the light-emitting surface, the first protective sheet including
a gel-like first impact absorption layer having a thickness of a submillimeter order or more, and comprising a gel-like bonding layer having an Asker C hardness of 30 or more and 80 or less, the gel-like bonding layer joining the first protective sheet directly or indirectly to the light-emitting surface,
a first strain relaxation layer,
a first impact dispersion layer having a pencil hardness of 3H or higher, the first strain relaxation layer having a flexural strength and a tensile strength both higher than the flexural strength and the tensile strength of the first impact dispersion layer, and
the first impact absorption layer, the first strain relaxation layer, and the first impact dispersion layer being arranged in this order from the light-emitting surface.
2. The display unit according to claim 1 , wherein the first impact absorption layer is made of an acrylic gel-like adhesive.
3. The display unit according to claim 1 , wherein the display panel comprises a flexible panel.
4. The display unit according to claim 3 , wherein the display panel comprises an organic EL panel.
5. The display unit according to claim 4 , wherein the first protective sheet includes one of a polarizing plate and a touch panel between the light-emitting surface and the first impact absorption layer, the touch panel including a transparent wiring line.
6. The display unit according to claim 4 , wherein the first strain relaxation layer comprises one of a polarizing plate and a touch panel, the touch panel including a metal wiring line.
7. The display unit according to claim 3 , further comprising a second protective sheet provided on a rear surface of the display panel, the second protective sheet including
a second impact dispersion layer having a pencil hardness of 3H or higher,
a second strain relaxation layer having flexural strength and tensile strength both higher than the flexural strength and the tensile strength of the second impact dispersion layer, and
a gel-like second impact absorption layer having a thickness of a submillimeter order or more,
the second impact absorption layer, the second strain relaxation layer, and the second impact dispersion layer being arranged in this order from the rear surface.
8. An electronic apparatus provided with a display unit, the display unit comprising:
a display panel having a light-emitting surface; and
a first protective sheet provided on the light-emitting surface, the first protective sheet including
a gel-like first impact absorption layer having a thickness of a submillimeter order or more, and comprising a gel-like bonding layer having an Asker C hardness of 30 or more and 80 or less, the gel-like bonding layer joining the first protective sheet directly or indirectly to the light-emitting surface,
a first strain relaxation layer, and
a first impact dispersion layer having a pencil hardness of 3H or higher, the first strain relaxation layer having a flexural strength and a tensile strength both higher than the flexural strength and the tensile strength of the first impact dispersion layer,
the first impact absorption layer, the first strain relaxation layer, and the first impact dispersion layer being arranged in this order from the light-emitting surface.
9. A protective sheet that protects a light-emitting surface of a display panel, the protective sheet comprising:
a gel-like first impact absorption layer having a thickness of a submillimeter order or more and comprising a gel-like bonding layer having an Asker C hardness of 30 or more and 80 or less, the gel-like bonding layer joining the first protective sheet directly or indirectly to the light-emitting surface;
a first strain relaxation layer; and
a first impact dispersion layer having a pencil hardness of 3H or higher, the first strain relaxation layer having a flexural strength and a tensile strength both higher than the flexural strength and the tensile strength of the first impact dispersion layer,
the first impact absorption layer, the first strain relaxation layer, and the first impact dispersion layer being arranged in this order.