In order to provide a
display device of high reliability in which an amount of
moisture and
oxygen, which are a factor for deteriorating a characteristics of a
display device, entering from a sealing agent is reduced and its manufacturing method, the present invention has a sealing film. Accordingly, an interlayer insulating film including an organic material of the
display device (panel) is no longer exposed to the
atmosphere outside of the display device. Therefore, it becomes possible to prevent
moisture and
oxygen outside of the display device from entering inside of the display device through an insulating film and the like including a hygroscopic organic material. In addition, various degradations such as
contamination of an inner part of the display device caused by
moisture,
oxygen and the like, the degradation of
electric properties, a
dark spot and shrink can be prevented, thus enhancing reliability of the display device.