TECHNICAL FIELD

The present disclosure relates to a display device and an electronic device.

BACKGROUND ART

The mainstream of display devices in these years is a display device of flat type (flat panel type). As one of flat-type display devices, there is a display device using what is called current-driven electro-optical element whose light emission luminance changes according to the value of a current flowing through the device as a light-emitting portion (light-emitting element) of a pixel. As a current-driven electro-optical element, an organic EL element is known that uses electroluminescence (EL) of an organic material and uses a phenomenon of emitting light when an electric field is applied to an organic thin film.

An organic EL display device using organic EL elements as light emitting units of pixels generally has a configuration in which an insulating film is provided in a state of covering a circuit portion formed on a substrate using a thin film transistor (TFT), and the organic EL elements are arranged and formed on the insulating film. Furthermore, on the organic EL elements, a cathode electrode is formed as an upper electrode in common to all pixels. The cathode electrode needs to be electrically connected to the circuit portion.

In order to electrically connect the cathode electrode to the circuit portion, conventionally, a configuration is employed in which a contact region is provided on an outer peripheral portion of an effective pixel region (display region), and the cathode electrode and the circuit portion are electrically connected in the contact region (for example, see Patent Document 1).

CITATION LIST

Patent Document

Patent Document 1: Japanese Patent Application Laid-Open No. 2014-199739

SUMMARY OF THE INVENTION

Problems to be Solved by the Invention

Incidentally, the contact region provided on the outer peripheral portion of the effective pixel region for the purpose of electrical connection between the cathode electrode and the circuit portion is a rate limiting factor for the width of a frame (panel peripheral edge portion) of the display panel. A large frame width of the display panel leads to an increase in manufacturing cost due to a decrease in theoretical yield, and also limits the design of a product equipped with the display device, which reduces the commercial value as a device. In particular, in a case of a small display device using a semiconductor substrate, the ratio of an effective screen to a chip size is small, and thus the influence of the size of an outer peripheral portion of the screen that is the frame of the display panel is significant.

Therefore, it is an object of the present disclosure to provide an organic EL display device in which a frame of a display panel can be narrowed upon providing a contact region that electrically connects a cathode electrode and a circuit portion on an outer peripheral portion of an effective pixel region, and an electronic device having the organic EL element.

Solutions to Problems

A display device of the present disclosure for achieving the above object has:

an organic electroluminescence (EL) layer formed on a circuit portion, which is formed on a substrate, with an insulating film interposed therebetween;

a cathode electrode formed on the organic EL layer in common to all pixels; and

a metal wiring provided on an outer peripheral portion of an effective pixel region and electrically connecting the cathode electrode to a wiring of the circuit portion,

in which the metal wiring has a recess or a projection on a contact surface in a connection portion with the cathode electrode.

Furthermore, an electronic device of the present disclosure for achieving the above object has a display device having the configuration described above.

