Image display device and method for manufacturing image display device
An image display device according to an embodiment includes a substrate, a first wiring line formed on the substrate along a first direction, a first light-emitting element located on the first wiring line and including a first light-emitting surface, a light-transmitting electrode formed along a second direction intersecting the first direction and located on the first light-emitting surface, a first anisotropic conductive member located on the first wiring line, a first terminal electrically connected to the first wiring line via the first anisotropic conductive member, a second anisotropic conductive member located on the light-transmitting electrode, and a second terminal electrically connected to the light-transmitting electrode via the second anisotropic conductive member. The first light-emitting element includes a first bottom surface in contact with the first wiring line, and the first light-emitting surface is located on a side of the first light-emitting element opposite to the first bottom surface.
1 . An image display device comprising:
a substrate;
a first wiring line formed on the substrate along a first direction;
a first light-emitting element located on the first wiring line and comprising a first light-emitting surface;
a first light-transmitting electrode formed along a second direction intersecting the first direction and located on the first light-emitting surface;
a first anisotropic conductive member located on the first wiring line;
a first terminal electrically connected to the first wiring line via the first anisotropic conductive member;
a second anisotropic conductive member located on the first light-transmitting electrode;
an insulating film located on a lateral surface of the first light-emitting element, the first wiring line, and the substrate, wherein the insulating film has light reflectivity; and
a second terminal located on the substrate via the insulating film, the first light-transmitting electrode, and the second anisotropic conductive member, the second terminal being electrically connected to the first light-transmitting electrode via the second anisotropic conductive member, wherein:
the first light-emitting element comprises a first bottom surface in contact with the first wiring line, and the first light-emitting surface is located on a side of the first light-emitting element opposite to the first bottom surface.
2 . The image display device according to claim 1 , further comprising:
a metal layer located between the first wiring line and the first light-emitting element.
3 . The image display device according to claim 1 , further comprising:
a second light-emitting element located adjacent to the first light-emitting element on the first wiring line and comprising a second light-emitting surface;
a second light-transmitting electrode formed along the second direction and located on the second light-emitting surface;
a light-transmitting substrate located on the first light-transmitting electrode and the second light-transmitting electrode; and
a third anisotropic conductive member located between the first light-emitting surface and the first light-transmitting electrode and electrically connecting the first light-emitting surface and the first light-transmitting electrode, and located between the second light-emitting surface and the second light-transmitting electrode and electrically connecting the second light-emitting surface and the second light-transmitting electrode, wherein:
the second light-emitting element comprises a second bottom surface in contact with the first wiring line, and the second light-emitting surface is located on a side of the second light-emitting element opposite to the second bottom surface.
4 . The image display device according to claim 3 , further comprising:
a third light-transmitting electrode located between the first light-emitting surface and the third anisotropic conductive member; and
a fourth light-transmitting electrode located between the second light-emitting surface and the third anisotropic conductive member, wherein:
the first light-emitting surface is electrically connected to the first light-transmitting electrode via the third light-transmitting electrode and the third anisotropic conductive member on the third light-transmitting electrode, and
the second light-emitting surface is electrically connected to the second light-transmitting electrode via the fourth light-transmitting electrode and the third anisotropic conductive member on the fourth light-transmitting electrode.
5 . The image display device according to claim 3 , further comprising:
a third terminal connected to the second light-transmitting electrode via the second anisotropic conductive member, wherein:
the second terminal is connected to the first light-transmitting electrode via the second anisotropic conductive member between the second terminal and the first light-transmitting electrode, and
the third terminal is connected to the second light-transmitting electrode via the second anisotropic conductive member between the third terminal and the second light-transmitting electrode.
6 . The image display device according to claim 3 , wherein the light-transmitting substrate comprises a glass substrate.
7 . The image display device according to claim 3 , wherein the light-transmitting substrate comprises a flexible substrate.
8 . The image display device according to claim 3 , wherein:
the first light-emitting element comprises a first semiconductor layer, a first light-emitting layer, and a second semiconductor layer,
the first semiconductor layer, the first light-emitting layer, and the second semiconductor layer are layered in this order from the first bottom surface toward the first light-emitting surface,
the second light-emitting element comprises a third semiconductor layer, a second light-emitting layer, and a fourth semiconductor layer,
the third semiconductor layer, the second light-emitting layer, and the fourth semiconductor layer are layered in this order from the second bottom surface toward the second light-emitting surface, and
the first semiconductor layer and the third semiconductor layer are n-type, and the second semiconductor layer and the fourth semiconductor layer are p-type.
9 . The image display device according to claim 1 , wherein the first light-emitting element comprises a gallium nitride compound.
10 . The image display device according to claim 1 , further comprising:
a wavelength conversion member on the first light-emitting element.
11 . An image display device comprising:
a substrate;
a first wiring line formed on the substrate along a first direction;
a first semiconductor layer located on the first wiring line;
a first light-emitting layer located on the first semiconductor layer;
a second light-emitting layer located, on the first semiconductor layer, away from the first light-emitting layer along the first direction;
a second semiconductor layer being a semiconductor layer of a conductivity type different from a conductivity type of the first semiconductor layer, located on the first light-emitting layer, and comprising a first light-emitting surface;
a third semiconductor layer being a semiconductor layer of a conductivity type identical to a conductivity type of the second semiconductor layer, located on the second light-emitting layer, and comprising a second light-emitting surface;
a first light-transmitting electrode formed along a second direction intersecting the first direction and located on the first light-emitting surface;
a second light-transmitting electrode formed along the second direction and located on the second light-emitting surface;
a first anisotropic conductive member located on the first wiring line;
a first terminal electrically connected to the first wiring line via the first anisotropic conductive member;
a second anisotropic conductive member located on the first light-transmitting electrode and the second light-transmitting electrode;
a second terminal electrically connected to the first light-transmitting electrode via the second anisotropic conductive member; and
a third terminal electrically connected to the second light-transmitting electrode via the second anisotropic conductive member, wherein:
the first light-emitting surface is located on a surface of the second semiconductor layer that is opposite to a surface of the second semiconductor layer that is in contact with the first light-emitting layer, and
the second light-emitting surface is located on a surface of the third semiconductor layer that is opposite to a surface of the third semiconductor layer that is in contact with the second light-emitting layer.
12 . A method for manufacturing an image display device, the method comprising:
providing a second substrate that comprises a first substrate, and a semiconductor layer formed on a first substrate, the semiconductor layer comprising a light-emitting layer;
forming a first conductive layer on a first surface of a third substrate;
bonding the semiconductor layer to the third substrate via the first conductive layer;
removing the first substrate;
forming a first wiring line along a first direction by processing the first conductive layer;
forming a first light-emitting element comprising a first light-emitting surface and a second light-emitting element comprising a second light-emitting surface by processing the semiconductor layer;
forming an insulating film covering the first surface, the first wiring line, the first light-emitting element, and the second light-emitting element;
exposing the first light-emitting surface and the second light-emitting surface by removing a part of the insulating film;
forming a first light-transmitting electrode located along a second direction intersecting the first direction on the first light-emitting surface, and forming a second light-transmitting electrode located along the second direction on the second light-emitting surface;
electrically connecting a first terminal and the first wiring line by a pressure applied between the first terminal and the first wiring line, by locating a first anisotropic conductive member between the first terminal and the first wiring line; and
electrically connecting the first light-transmitting electrode and a second terminal via a second anisotropic conductive member, and electrically connecting the second light-transmitting electrode and a third terminal via the second anisotropic conductive member, wherein
the first light-emitting element comprises a first bottom surface connected to the first wiring line, and the first light-emitting surface is located on a side of the first light-emitting element opposite to the first bottom surface, and
the second light-emitting element comprises a second bottom surface connected to the first wiring line, and the second light-emitting surface is located on a side of the second light-emitting element opposite to the second bottom surface.
13 . The method for manufacturing an image display device according to claim 12 , wherein:
the step of electrically connecting the first light-transmitting electrode and the second terminal, and electrically connecting the second light-transmitting electrode and the third terminal comprises:
electrically connecting the second terminal and the first light-transmitting electrode by a pressure applied between the second terminal and the first light-transmitting electrode, and electrically connecting the third terminal and the second light-transmitting electrode by a pressure applied between the second light-transmitting electrode and the third terminal, by locating the second anisotropic conductive member between the first light-transmitting electrode and the second terminal and between the second light-transmitting electrode and the third terminal.
14 . The method for manufacturing an image display device according to claim 12 , wherein:
the step of forming the first light-transmitting electrode and forming the second light-transmitting electrode comprises:
forming a first light-transmitting electrode and a second light-transmitting electrode on a second surface of a fourth substrate having light-transmitting properties, and
electrically connecting the first light-emitting surface and the first light-transmitting electrode and electrically connecting the second light-emitting surface and the second light-transmitting electrode by a pressure applied between the fourth substrate and the third substrate, by disposing the first light-emitting surface and the second light-emitting surface in a state of facing the second surface via a third anisotropic conductive member.
15 . The method for manufacturing an image display device according to claim 12 , further comprising:
after the step of exposing the first light-emitting surface and the second light-emitting surface, forming a third light-transmitting electrode on the first light-emitting surface, and forming a fourth light-transmitting electrode on the second light-emitting surface.
16 . The method for manufacturing an image display device according to claim 14 , wherein:
the step of electrically connecting the first light-transmitting electrode and the second terminal, and electrically connecting the second light-transmitting electrode and the third terminal comprises:
electrically connecting the second terminal and the first light-transmitting electrode by a pressure applied between the second terminal and the fourth substrate and electrically connecting the third terminal and the second light-transmitting electrode by a pressure applied between the fourth substrate and the third terminal, by locating the second anisotropic conductive member between the first light-transmitting electrode and the second terminal and between the second light-transmitting electrode and the third terminal.
17 . The method for manufacturing an image display device according to claim 14 , wherein the fourth substrate comprises a glass layer.
18 . The method for manufacturing an image display device according to claim 17 , wherein:
the fourth substrate further comprises an organic resin layer located on the glass layer, and
the method further comprises, after electrically connecting the first light-emitting surface and the first light-transmitting electrode and electrically connecting the second light-emitting surface and the second light-transmitting electrode, removing the glass layer.
19 . The method for manufacturing an image display device according to claim 12 wherein:
the step of forming the first wiring line is performed after the step of bonding the semiconductor layer to the third substrate.
20 . The method for manufacturing an image display device according to claim 12 , further comprising:
forming a wavelength conversion member on the first light-emitting element and the second light-emitting element.
21 . The method for manufacturing an image display device according to claim 20 , wherein the step of forming the wavelength conversion member comprises forming the wavelength conversion member on a plurality of light-emitting elements comprising the first light-emitting element and the second light-emitting element.
22 . A method for manufacturing an image display device, the method comprising:
providing a second substrate that comprises a first substrate, and a semiconductor layer formed on a first substrate, the semiconductor layer comprising a light-emitting layer;
forming a second conductive layer on the semiconductor layer;
providing a third substrate comprising a first surface;
bonding the semiconductor layer to the first surface via the second conductive layer;
removing the first substrate;
forming a first wiring line along a first direction by processing the second conductive layer;
forming a first light-emitting element comprising a first light-emitting surface and a second light-emitting element comprising a second light-emitting surface by processing the semiconductor layer;
forming an insulating film covering the first surface, the first wiring line, the first light-emitting element, and the second light-emitting element;
exposing the first light-emitting surface and the second light-emitting surface by removing a part of the insulating film;
forming a first light-transmitting electrode located along a second direction intersecting the first direction on the first light-emitting surface, and forming a second light-transmitting electrode located along the second direction on the second light-emitting surface;
electrically connecting a first terminal and the first wiring line by a pressure applied between the first terminal and the first wiring line, by locating a first anisotropic conductive member between the first terminal and the first wiring line; and
electrically connecting the first light-transmitting electrode and a second terminal via a second anisotropic conductive member, and electrically connecting the second light-transmitting electrode and a third terminal via the second anisotropic conductive member, wherein
the first light-emitting element comprises a first bottom surface connected to the first wiring line, and the first light-emitting surface is located on a side of the first light-emitting element opposite to the first bottom surface, and
the second light-emitting element comprises a second bottom surface connected to the first wiring line, and the second light-emitting surface is located on a side of the second light-emitting element opposite to the second bottom surface.