Display device and electronic device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsShunpei YAMAZAKI, Koji KUSUNOKI, Masahiro KATAYAMA, Rai SATO
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Abstract
A display device with a high aperture ratio is provided. A step caused by a contact hole (50) for electrically connecting a wiring (33) and a pixel electrode (41) to each other is eliminated by being filled with an organic insulating layer (52), and a top surface of the pixel electrode is made flat to form an alignment film (45a) so that an alignment defect of a liquid crystal layer (40) is reduced. In addition, a light-transmitting material is used for the wiring (33) exposed to a bottom portion of the contact hole (50). Accordingly, an effective display region of a liquid crystal device can be increased. That is, the display device can have a high aperture ratio.
Claims13
A display device comprising:
- a first transistor;
- a first conductive layer;
- a second conductive layer;
- a third conductive layer;
- a first insulating layer;
- a second insulating layer;
- an alignment film;
- and
- a liquid crystal layer,
- wherein the first transistor is electrically connected to the first conductive layer,
- wherein the first insulating layer is provided over the first transistor and the first conductive layer,
- wherein the first insulating layer comprises an opening portion penetrating the first insulating layer in a region overlapping the first conductive layer,
- wherein the second conductive layer is provided to be in contact with a top surface of the first insulating layer, a side surface of the opening portion, and the first conductive layer exposed to a bottom portion of the opening portion,
- wherein the second insulating layer is provided to be in contact with the second conductive layer to fill a step caused by the opening portion,
- wherein the third conductive layer is provided to be in contact with the second conductive layer and the second insulating layer,
- wherein the alignment film is provided over the first insulating layer, the second conductive layer, and the third conductive layer,
- wherein the liquid crystal layer is provided over the alignment film, and
- wherein the first conductive layer, the second conductive layer, the third conductive layer, the first insulating layer, and the second insulating layer each have a property of transmitting visible light.
A display device comprising:
- a first transistor;
- a first conductive layer;
- a second conductive layer;
- a third conductive layer;
- a first insulating layer;
- a second insulating layer;
- an alignment film;
- and
- a liquid crystal layer,
- wherein the first transistor is electrically connected to the first conductive layer,
- wherein the first insulating layer is provided over the first transistor and the first conductive layer,
- wherein the first insulating layer comprises an opening portion penetrating the first insulating layer in a region overlapping the first conductive layer,
- wherein the second conductive layer is provided to be in contact with a top surface of the first insulating layer, a side surface of the opening portion, and a top surface of the first conductive layer,
- wherein the second insulating layer is provided to be in contact with the second conductive layer,
- wherein the third conductive layer is provided to be in contact with the second conductive layer and the second insulating layer,
- wherein the alignment film is provided over the first insulating layer, the second conductive layer, and the third conductive layer,
- wherein the liquid crystal layer is provided over the alignment film, and
- wherein the first conductive layer, the second conductive layer, the third conductive layer, the first insulating layer, and the second insulating layer each have a property of transmitting visible light.
Dependencies are inferred from the claim text.