This application claims priority to Korean Patent Application No. 10-2020-0066614, filed on Jun. 2, 2020, and all the benefits accruing therefrom under 35 U.S.C. § 119, the content of which in its entirety is herein incorporated by reference.

BACKGROUND

1. Field

The disclosure relates to a display device including an optical element.

2. Description of the Related Art

A display device may include an optical element such as a sensor, a camera, or the like. In such a display device, the optical element may be dispose in a bezel area (area surrounding a screen) of the display device to avoid interference with the screen.

When the bezel of the display device is reduced, a screen-to-body ratio of the display device, that is, a ratio occupied by the screen when the display device is viewed from a front, may be increased. It is desired to increase the scree-to-body ratio of the display device in the market.

SUMMARY

In a display device including an optical element, as a bezel of the display device is reduced, it is difficult to dispose the optical element in a bezel area, and thus it is desired to develop a technology to dispose the optical element in a screen area.

Embodiments are directed to a display device including an optical element with improved resolution and transmittance by disposing the optical element in a screen area.

An embodiment of a display device includes: a substrate including a first display area and a second display area; an optical element which overlaps the second display area; a semiconductor layer disposed on the substrate; a first insulation layer disposed to cover the semiconductor layer; a gate conductor disposed on the first insulation layer; a second insulation layer disposed to cover the gate conductor; a data conductor disposed on the second insulation layer; a third insulation layer disposed to cover the data conductor; and a pixel electrode disposed on the data conductor, where the data conductor disposed in the first display area is an opaque conductor, and a part of the data conductor disposed in the second display area is a transparent conductor.

In an embodiment, the data conductor in the second display area may include a source connection portion, a drain connection portion and a wiring portion, which are connected to the semiconductor layer, and the wiring portion may be the transparent conductor.

In an embodiment, the transparent conductor may have a triple layer structure including an upper layer, an intermediate layer and a lower layer, the upper layer and the lower layer may include at least one selected from indium tin oxide (“ITO”), indium zinc oxide (“IZO”), indium gallium zinc oxide (“IGZO”), aluminum zinc oxide (“AZO”), gallium zinc oxide (“GZO”), and indium tin zinc oxide (“ITZO”), and the intermediate layer may include at least one selected from silver (Ag), copper (Cu) and aluminum (Al).

In an embodiment, a thickness of the intermediate layer is about 300 angstrom (Å) or less.

In an embodiment, each of the source connection portion and the drain connection portion may have a triple layer structure in each of which an upper layer and a lower layer include titanium (Ti), and an intermediate layer includes aluminum (Al).

In an embodiment, the pixel electrode may have the triple layer including the upper layer, the intermediate layer, and the lower layer.

In an embodiment, the gate conductor may have the triple layer structure including the upper layer, the intermediate layer, and the lower layer.

In an embodiment, the data conductor in the first display area may have a triple layer in which an upper layer and a lower layer include titanium (Ti), and an intermediate layer includes aluminum (Al).

In an embodiment, the second display area may include a transmittance region.

An embodiment of a display device includes: a substrate including a first display area and a second display area; an optical element which overlaps the second display area; a scan line disposed on the substrate and extending in a first direction; a data line and a driving voltage line which extend in a second direction perpendicular to the first direction; a driving transistor including a first electrode electrically connected to the driving voltage line, and a first gate electrode; a second transistor including a first electrode connected to the data line; and a pixel electrode electrically connected with the driving transistor, where the data line and the driving voltage line disposed in the first display area include an opaque conductor, and at least one selected from the data line and the driving voltage line disposed in the second display area is a transparent conductor.

In an embodiment, the data line in the second display area may include a wiring portion extending in the second direction, and a second transistor connection portion connected to the first electrode of the second transistor.

In an embodiment, the wiring portion of the data line may be the transparent conductor, and the second transistor connection portion of the data line may include the opaque conductor.

In an embodiment, the display device may further include a third transistor including a first electrode connected to the driving voltage line.

In an embodiment, the driving voltage line may include a horizontal wiring portion extending in the first direction, a vertical wiring portion extending in the second direction, an electrode island connection portion, a sustain electrode connection portion, and a fifth transistor connection portion.

In an embodiment, the horizontal wiring portion and the vertical wiring portion of the driving voltage line may include the transparent conductor, and the electrode island connection portion, the sustain electrode connection portion and the fifth transistor connection portion may include the opaque conductor.

In an embodiment, the horizontal wiring portion may be electrically connected to the sustain electrode connection portion by directly contacting the horizontal wiring portion.

In an embodiment, the sustain electrode may form a storage capacitor with the first gate electrode, and an insulation layer interposed therebetween.

In an embodiment, the vertical wiring portion may include a first vertical wiring portion and a second vertical wiring portion, the first vertical wiring portion may be electrically connected to the electrode island connection portion by directly contacting the electrode island connection portion, and the second vertical wiring portion may be electrically connected to the third transistor connection portion by directly contacting the third transistor connection portion.

In an embodiment, the electrode island connection portion may be electrically connected to an electrode island through an opening in an insulation layer.

In an embodiment, the third transistor connection portion may be electrically connected to a first electrode of the third transistor through an opening in an insulation layer.

According to embodiments, an optical element is disposed in a screen in a display device including the optical element, and a part of wiring of a pixel area overlapping the optical element includes a transparent conductor, thereby improving resolution and transmittance of the display device.

