A method for manufacturing a display device with low power consumption is provided. A method for manufacturing a display device includes a step of forming a first layer over a substrate by using a material containing a resin or a resin precursor, a step of forming a first region and a second region thinner than the first region in the first layer, a step of forming a first resin layer including a first region and a second region thinner than the first region by performing first heat treatment on the first layer in a gas containing oxygen, a step of forming, over the first resin layer, a layer to be separated including a display element, and a step of separating the layer to be separated and the substrate from each other. A step of forming a conductive layer over the first resin layer in a position overlapping with the second region is included in the step of forming the layer to be separated. A step of exposing the conductive layer by removing the first resin layer is included after the step of separating the layer to be separated and the substrate from each other.

A method for manufacturing a display device with low power consumption is provided.

A method for manufacturing a display device includes a step of forming a first layer over a substrate by using a material containing a resin or a resin precursor, a step of forming a first region and a second region thinner than the first region in the first layer, a step of forming a first resin layer including a first region and a second region thinner than the first region by performing first heat treatment on the first layer in a gas containing oxygen, a step of forming, over the first resin layer, a layer to be separated including a display element, and a step of separating the layer to be separated and the substrate from each other. A step of forming a conductive layer over the first resin layer in a position overlapping with the second region is included in the step of forming the layer to be separated. A step of exposing the conductive layer by removing the first resin layer is included after the step of separating the layer to be separated and the substrate from each other.

An image display apparatus includes a sub display panel and a main display panel. The sub display panel includes a liquid crystal cell and a polarizing plate arranged along at least one of main surfaces of the liquid crystal cell. The main display panel includes a liquid crystal cell and a polarizing plate arranged along at least one of main surfaces of the liquid crystal cell. The main display panel overlaps the sub display panel in a direction perpendicular to a main surface of the sub display panel. When the sub display panel is heated, the sub display panel is warped towards the main display panel.

An image display apparatus includes a sub display panel and a main display panel. The sub display panel includes a liquid crystal cell and a polarizing plate arranged along at least one of main surfaces of the liquid crystal cell. The main display panel includes a liquid crystal cell and a polarizing plate arranged along at least one of main surfaces of the liquid crystal cell. The main display panel overlaps the sub display panel in a direction perpendicular to a main surface of the sub display panel. When the sub display panel is heated, the sub display panel is warped towards the main display panel.

A display device comprises: a display panel in which a plurality of pixels are arranged in a matrix form, wherein the plurality of pixels include a plurality of first pixels and a plurality of second pixels arrayed at a pitch different from an array pitch of the plurality of first pixels, and a number of the plurality of first pixels is different from a number of the plurality of second pixels.

A display device comprises: a display panel in which a plurality of pixels are arranged in a matrix form, wherein the plurality of pixels include a plurality of first pixels and a plurality of second pixels arrayed at a pitch different from an array pitch of the plurality of first pixels, and a number of the plurality of first pixels is different from a number of the plurality of second pixels.

A semiconductor device including a large display portion with improved portability is provided. The display device includes a first display panel, a second display panel, and an adhesive layer. The area of the second display panel is larger than the area of the first display panel. The first display panel includes a first substrate, a second substrate, and a reflective liquid crystal element and a first transistor each positioned between the first substrate and the second substrate. The second display panel includes a first resin layer having flexibility, a second resin layer having flexibility, and a light-emitting element and a second transistor each positioned between the first resin layer and the second resin layer. The liquid crystal element has a function of reflecting light toward the second substrate side. The light-emitting element has a function of emitting light toward the second resin layer aide. The first substrate and part of the second resin layer are bonded to each other with the adhesive layer.

A semiconductor device including a large display portion with improved portability is provided. The display device includes a first display panel, a second display panel, and an adhesive layer. The area of the second display panel is larger than the area of the first display panel. The first display panel includes a first substrate, a second substrate, and a reflective liquid crystal element and a first transistor each positioned between the first substrate and the second substrate. The second display panel includes a first resin layer having flexibility, a second resin layer having flexibility, and a light-emitting element and a second transistor each positioned between the first resin layer and the second resin layer. The liquid crystal element has a function of reflecting light toward the second substrate side. The light-emitting element has a function of emitting light toward the second resin layer aide. The first substrate and part of the second resin layer are bonded to each other with the adhesive layer.

Provided is a display device enhancing an image contrast ratio and thereby enhancing display quality without being affected by ambient brightness. The luminance of an image displayed on a first liquid crystal panel in a display gradually increases in slope as a gradation value increases from 0 to 255. Accordingly, luminance A for the gradation value 0 is the same as conventional luminance a for the gradation value 0. However, luminance B for the gradation value 255 is higher than conventional luminance 2b for that gradation value, resulting in a high contrast ratio as expressed by the following equation:
B:A=B/A:1>2b/a:1.

A semiconductor device including a large display portion with improved portability is provided. The display device includes a first display panel, a second display panel, and an adhesive layer. The area of the second display panel is larger than the area of the first display panel. The first display panel includes a first substrate, a second substrate, and a reflective liquid crystal element and a first transistor each positioned between the first substrate and the second substrate. The second display panel includes a first resin layer having flexibility, a second resin layer having flexibility, and a light-emitting element and a second transistor each positioned between the first resin layer and the second resin layer. The liquid crystal element has a function of reflecting light toward the second substrate side. The light-emitting element has a function of emitting light toward the second resin layer side. The first substrate and part of the second resin layer are bonded to each other with the adhesive layer.