CROSS REFERENCE TO RELATED APPLICATION

This application claims the priority of Korean Patent Application No. 10-2018-0089113, filed on Jul. 31, 2018, in the Korean Intellectual Property Office, which is hereby incorporated by reference in its entirety.

BACKGROUND

Field of the Disclosure

The present disclosure relates to a display device, and more particularly, to a display device, a head-mounted display device including the display device and a method for manufacturing the same.

Description of the Background

With the advancement of the information age, the demand for a display device for displaying an image has increased with various forms. Therefore, various types of display devices such as a non-self-light emitting display device including a liquid crystal display (LCD) device and a plasma display panel (PDP) device and an electroluminescence display device including an organic light emitting display (OLED) device and a quantum dot light emitting display (QLED) device have been recently used.

Among the display devices, the organic light emitting display device is a self-light emitting device, and has advantages in that a viewing angle and a contrast ratio are more excellent than those of the liquid crystal display (LCD) device. Also, since the organic light emitting display device does not require a separate backlight, it is advantageous that the organic light emitting display device is able to be thin and lightweight and has low power consumption. Furthermore, the organic light emitting display device has advantages in that it may be driven at a low direct current voltage, has a fast response speed, and especially has a low manufacturing cost.

The organic light emitting display device includes a plurality of light emitting diodes. Light emitting layers having their respective colors different from each other are formed to be patterned in the plurality of light emitting diodes. In the related art, the light emitting layers having their respective colors different from each other are formed to be patterned through a process using a fine metal mask (FMM) or photoresist. However, if the FMM is used, the metal mask is sagged due to its weight, whereby a problem occurs in that it is difficult to make an accurate deposition. Also, if a photoresist is used, a problem occurs in that a light emitting layer is damaged due to a solution process. This problem occurs more seriously in a display device, which has a compact pixel interval, such as a head mounted display (HMD) of ultra-high resolution.

SUMMARY

The present disclosure has been made in view of the above problems, and it is an object of the present disclosure to provide a display device that may prevent a light emitting layer and an upper electrode from being damaged.

The present disclosure to provide a display device in which a light emitting layer and an upper electrode may be provided to be accurately patterned.

In accordance with an aspect of the present disclosure, the above-described aspects can be accomplished by the provision of a display device comprising a first substrate having a plurality of subpixels, a lower electrode provided in each of the plurality of subpixels on the first substrate, a light emitting layer provided on the lower electrode and an upper electrode provided on the light emitting layer, wherein the light emitting layer includes a photoisomerized material.

In accordance with another aspect of the present disclosure, the above-described aspects can be accomplished by the provision of a method for manufacturing a display device comprising providing a first substrate having a plurality of subpixels, providing a lower electrode in each of the plurality of subpixels on the first substrate, providing a light emitting layer on the lower electrode, and providing an upper electrode on the light emitting layer, wherein the light emitting layer includes a photoisomerized material.

According to the present disclosure, since the light emitting layer includes a photoisomerized material, an upper electrode may selectively be deposited.

According to the present disclosure, light emitting layers emitting light of different colors and the upper electrode may be formed to be patterned even without FMM. Therefore, in the present disclosure, since sagging of the FMM is not generated, the light emitting layer and the upper electrode may be formed to be patterned accurately. Also, the cost caused by use and maintenance of the FMM may be reduced.

Also, in the present disclosure, light emitting layers emitting light of different colors and the upper electrode may be formed to be patterned even without photoresist. Therefore, in the present disclosure, the light emitting layer and the upper electrode may be prevented from being damaged during a manufacturing process, and lifespan and efficiency of a light emitting diode may be improved.

Also, in the present disclosure, since the upper electrode is formed to be patterned, its formation area may be minimized. Therefore, in the present disclosure, external light reflection by the upper electrode may be reduced, and parasitic capacitance generated between the upper electrode and another electrode layer may be reduced.

In addition to the effects of the present disclosure as mentioned above, additional objects and features of the present disclosure will be clearly understood by those skilled in the art from the following description of the present disclosure.

