TECHNICAL FIELD

The present disclosure relates to a display device.

BACKGROUND ART

In recent years, an organic electroluminescence (EL) display device of the self-luminous type using an organic EL element has attracted attention as a display device that can replace a liquid crystal display device. The organic EL display device is provided with a sealing film that covers the organic EL element to suppress degradation of the organic EL element due to penetration of, for example, moisture and oxygen. As a sealing structure obtained by the sealing film, there has been proposed a structure in which a layered film including an organic layer and an inorganic layer constitutes the sealing film (for example, see JP 2011-175300 A PTL 1). The organic layer constituting the sealing film is formed by an ink-jet method, for example.

SUMMARY

Incidentally, the film formation properties of an organic layer formed by an ink-jet method are easily affected by a state of a film formed surface, and thus it is difficult to form a peripheral edge (edge) of the organic layer at high accuracy. When the organic layer is formed, a material (ink) of the organic layer is not applied to a predetermined position in a frame region, and stagnates on a display region side such as a part in which a monolithic circuit is present. In this case, when a foreign matter is present at a location that is originally intended to be covered with the organic layer, a sealing film fails to cover the foreign matter, and a defect may be caused in the sealing film.

For this reason, it is necessary to confirm that the material forming the organic layer is applied to the predetermined position in the frame region at a step of forming the sealing film. However, in the part of the frame region including the peripheral edge position of the organic layer, a metal layer constituting an electrode of the organic EL element and a frame wiring line is formed, and a metal material such as silver (Ag) having high reflectivity is suitably used for the metal layer. Thus, due to light reflected by the metal layer, it is difficult to confirm a coating position of the material forming the organic layer.

A technique of the present disclosure has been made in view of this point, and an object of the present disclosure is to securely confirm that a material forming an organic layer is applied to a predetermined position in a frame region.

Solution to Problem

A display device according to the technique of the present disclosure includes a substrate, a first metal layer being provided on the substrate, a flattening film being provided on the first metal layer, a second metal layer and a plurality of light-emitting elements being provided on the flattening film, and a sealing film covering the plurality of light-emitting elements, wherein a display region and a frame region are provided, the display region in which an image is displayed by light emission of the plurality of light-emitting elements, and the frame region being positioned in a periphery of the display region, the sealing film includes an organic layer, and the organic layer includes a circumferential end edge being positioned in the frame region, a slit is formed in an outer side of the flattening film, the slit overlapping the circumferential end edge of the organic layer, the first metal layer and the second metal layer are each provided across the slit, and are in contact with each other inside the slit, and an opening is formed in at least one metal layer of the first metal layer and the second metal layer, the opening exposing a lower layer of the first metal layer from the at least one metal layer at a position at which the organic layer and the slit overlap each other.

According to the display device described above, the opening is formed in at least one metal layer of the first metal layer and the second metal layer being in contact with each other inside the slit of the flattening film in the frame region, and the opening exposes the lower layer of the first metal layer at the position at which the organic layer and the slit overlap each other. Thus, at the location at which the opening is formed, light is not reflected by the metal layer, and even when a metal material having high reflectivity is used for the metal layer, it is possible to securely confirm that the material for forming the organic layer is applied to the predetermined position in the frame region in manufacturing of the display device. Accordingly, inspection for a coating region of the organic layer can be performed easily, and the number of defective panels fed to the next step can be reduced.

