KR20210037349A - Display device - Google Patents

Abstract

The present invention provides a display device for reducing power consumption. The display device according to one embodiment of the present invention includes: a substrate including a first sub-pixel and a second sub-pixel; a first light emitting layer provided on the substrate to emit light of a first color; a second light emitting layer provided on the first light emitting layer to emit light of a second color; a first electrode provided between the substrate and the first light emitting layer; a second electrode provided between the first light emitting layer and the second light emitting layer; a third electrode provided on the second light emitting layer; a first undercut structure region provided on at least one side of the first sub-pixel and disposed thereon with a first lower layer and a first upper layer having a first undercut structure; and a second undercut structure region surrounding the second sub-pixel and disposed thereon with a second lower layer and a second upper layer having a second undercut structure. The second electrode and the third electrode provided in the first sub-pixel are connected in the first undercut structure region, and the second light emitting layer and the third electrode provided in the second sub-pixel are connected in the second undercut structure region.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device that displays an image.

As the information society develops, demands for display devices for displaying images are increasing in various forms. Accordingly, in recent years, various display devices such as a liquid crystal display (LCD), a plasma display panel (PDP), and an organic light emitting display (OLED) have been used.

Recently, a head mounted display (HMD) including such a display device has been developed. A head mounted display (HMD) is a virtual reality (VR) or augmented reality glasses-type monitor device that is worn in the form of glasses or a helmet to form a focus at a close distance in front of the user's eyes.

In such a head-mounted display, it is difficult to precisely pattern light emitting layers of different colors for each sub-pixel due to a high-resolution, dense pixel spacing. In order to solve this problem, the head-mounted display may implement different colors by forming a white emission layer consisting of a plurality of stacks emitting light of different colors as a common layer, and disposing color filters for each sub-pixel. In this case, the head-mounted display has an advantage in that it does not require a precise mask fabrication or a precise mask alignment process, but there is a problem that a lot of power is consumed due to a plurality of stacks.

The present invention provides a display device capable of reducing power consumption.

The display device according to an exemplary embodiment of the present invention includes a substrate including a first sub-pixel and a second sub-pixel, a first emission layer provided on the substrate to emit light of a first color, and a first emission layer. A second light-emitting layer emitting light of two colors, a first electrode provided between the substrate and the first light-emitting layer, a second electrode provided between the first light-emitting layer and the second light-emitting layer, a third electrode provided on the second light-emitting layer, A first undercut structure region provided on at least one side of the first sub-pixel and in which a first lower layer having a first undercut structure and a first upper layer are disposed, and a second lower layer surrounding the second sub-pixel and having a second undercut structure And a second undercut structure region in which the second upper layer is disposed. The second electrode and the third electrode provided in the first sub-pixel are connected in the first undercut structure region, and the second emission layer and the third electrode provided in the second sub-pixel are connected in the second undercut structure region.

A display device according to another exemplary embodiment of the present invention includes a first sub-pixel and a first light-emitting layer, a second electrode, a second light-emitting layer, and a second light-emitting layer and a third electrode. It includes a second sub-pixel consisting of three electrodes. In addition, the display device according to another exemplary embodiment of the present invention includes a first undercut structure provided on at least one side of a first sub-pixel, including a first lower layer and a first upper layer provided on the first lower layer, and a second sub-pixel. A second undercut structure is provided to surround the pixels and includes a second lower layer and a second upper layer provided on the second lower layer. The first lower layer of the first undercut structure is higher in height than the second lower layer of the second undercut structure.

According to the present invention, by forming the first emission layer and the second emission layer on the sub-pixels without a mask on the entire surface, it is possible to solve the problem of patterning different emission layers for each sub-pixel using a mask. That is, the present invention does not require a precise mask fabrication or a precise mask alignment process, and can be applied to a high-resolution display device having a dense pixel gap.

In addition, although the first emission layer and the second emission layer are formed on the entire surface of the present invention, only one of the first emission layer and the second emission layer may emit light in each of the sub-pixels. Accordingly, the present invention can significantly reduce power consumption compared to emitting light of both the first and second emission layers.

In addition, according to the present invention, the second electrode and the third electrode of some sub-pixels may be electrically connected using the undercut structure. In this case, according to the present invention, since the second electrode and the third electrode are connected in a plurality of regions, the second electrode and the third electrode can be stably connected and the resistance can be reduced.

In addition, according to the present invention, the first electrode may not be formed in some sub-pixels. Accordingly, the present invention can improve the transmittance in the sub-pixel in which the first electrode is not formed. In particular, when the display device is made of a bottom emission method, since light emitted from the emission layer does not have to pass through the first electrode, Light efficiency can be improved.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art from the following description. .

1 is a perspective view illustrating a display device according to an exemplary embodiment of the present invention.
FIG. 2 is a plan view showing a first substrate, a source drive IC, a flexible film, a circuit board, and a timing controller of FIG. 1.
3 is a schematic plan view of a first substrate of a display panel according to an exemplary embodiment.
4 is a cross-sectional view illustrating an example of II of FIG. 3.
5 is a cross-sectional view illustrating an example of II-II of FIG. 3.
6 is a plan view schematically illustrating a first sub-pixel and a first undercut area according to an exemplary embodiment of the present invention.
7 is a cross-sectional view illustrating an example of III-III of FIG. 6.
8 is a plan view schematically illustrating a second sub-pixel, a first undercut area, and a second undercut area according to an exemplary embodiment of the present invention.
9 is a cross-sectional view illustrating an example of IV-IV of FIG. 8.
10 is a plan view schematically illustrating a third sub-pixel, a first undercut area, and a second undercut area according to an exemplary embodiment of the present invention.
11 is a cross-sectional view illustrating an example of VV of FIG. 10.
12 is a cross-sectional view showing a first undercut structure area and a second undercut structure area.
13 is a diagram illustrating light emitted from each of first to third sub-pixels.
14 is a plan view schematically showing a first substrate according to another embodiment of the present invention.
15 is a cross-sectional view illustrating an example of VI-VI of FIG. 14.
16 is a diagram illustrating light emitted from each of first to fourth sub-pixels.
17A to 17C relate to a display device according to another embodiment of the present invention, which relates to a head mounted display (HMD) device.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only these embodiments are intended to complete the disclosure of the present invention, and those skilled in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for describing the embodiments of the present invention are exemplary, and the present invention is not limited to the illustrated matters. The same reference numerals refer to the same elements throughout the specification. In addition, in describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

When'include','have','consists of' and the like mentioned in the present specification are used, other parts may be added unless'only' is used. In the case of expressing the constituent elements in the singular, it includes the case of including the plural unless specifically stated otherwise.

In interpreting the constituent elements, it is interpreted as including an error range even if there is no explicit description.

In the case of a description of the positional relationship, for example, if the positional relationship of two parts is described as'upper','upper of','lower of','next to','right' Or, unless'direct' is used, one or more other parts may be located between the two parts.

In the case of a description of a temporal relationship, for example, when a temporal predecessor relationship is described as'after','following','after','before', etc.,'right' or'direct' It may also include cases that are not continuous unless this is used.

First, second, etc. are used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one component from another component. Accordingly, the first component mentioned below may be a second component within the technical idea of the present invention.

"X-axis direction", "Y-axis direction" and "Z-axis direction" should not be interpreted only as a geometrical relationship in which the relationship between each other is vertical, and is wider than within the range in which the configuration of the present invention can function functionally. It can mean having directionality.

The term “at least one” is to be understood as including all possible combinations from one or more related items. For example, the meaning of “at least one of the first item, the second item, and the third item” means that each of the first item, the second item, or the third item, as well as the first item, the second item, and the third item, It may mean a combination of all items that can be presented from more than one.

Each of the features of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments can be implemented independently of each other or can be implemented together in a related relationship. May be.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view illustrating a display device according to an exemplary embodiment of the present invention. FIG. 2 is a plan view showing a first substrate, a source drive IC, a flexible film, a circuit board, and a timing controller of FIG. 1.

1 and 2, a display device 100 according to an embodiment of the present invention includes a display panel 110, a source drive integrated circuit (hereinafter referred to as "IC") 140, and a flexible film. 150, a circuit board 160, and a timing control unit 170.

The display panel 110 includes a first substrate 111 and a second substrate 112. The second substrate 112 may be an encapsulation substrate. The first substrate 111 may be a plastic film, a glass substrate, or a silicon wafer substrate formed using a semiconductor process. The second substrate 112 may be a plastic film, a glass substrate, or an encapsulation film.

Gate lines, data lines, and sub-pixels are formed on one surface of the first substrate 111 facing the second substrate 112. The sub-pixels are provided in a region defined by an intersection structure of gate lines and data lines.

Each of the sub-pixels may include a light emitting device including a thin film transistor, an anode electrode, a light emitting layer, and a cathode electrode. Each of the sub-pixels supplies a predetermined current to the light emitting device according to the data voltage of the data line when a gate signal is input from the gate line using the thin film transistor. Accordingly, when a high potential voltage is applied to the anode electrode and a low potential voltage is applied to the cathode electrode, the light emitting layers of each of the sub-pixels can emit light with a predetermined brightness according to a predetermined current.

The display panel 110 may be divided into a display area DA in which sub-pixels are formed to display an image and a non-display area NDA that does not display an image. Gate lines, data lines, and sub-pixels may be formed in the display area DA. Gate drivers and pads may be formed in the non-display area NDA.

The gate driver supplies gate signals to the gate lines according to the gate control signal input from the timing controller 170. The gate driver may be formed in a non-display area DA on one or both sides of the display area DA of the display panel 110 in a GIP (gate driver in panel) method. Alternatively, the gate driver is manufactured as a driving chip, mounted on a flexible film, and attached to a non-display area DA outside one or both sides of the display area DA of the display panel 110 in a TAB (tape automated bonding) method. May be.

The source drive IC 140 receives digital video data and a source control signal from the timing controller 170. The source drive IC 140 converts digital video data into analog data voltages according to a source control signal and supplies them to data lines. When the source drive IC 140 is manufactured as a driving chip, it may be mounted on the flexible film 150 in a chip on film (COF) or chip on plastic (COP) method.

Pads such as data pads may be formed in the non-display area NDA of the display panel 110. Wires connecting the pads and the source drive IC 140 and wires connecting the pads and the wires of the circuit board 160 may be formed on the flexible film 150. The flexible film 150 is attached on the pads using an anisotropic conducting film, whereby the wires of the flexible film 150 may be connected to the pads.

The circuit board 160 may be attached to the flexible films 150. The circuit board 160 may be mounted with a plurality of circuits implemented with driving chips. For example, the timing controller 170 may be mounted on the circuit board 160. The circuit board 160 may be a printed circuit board or a flexible printed circuit board.

The timing controller 170 receives digital video data and a timing signal from an external system board through a cable of the circuit board 160. The timing controller 170 generates a gate control signal for controlling an operation timing of the gate driver and a source control signal for controlling the source driver ICs 140 based on the timing signal. The timing controller 170 supplies a gate control signal to the gate driver and supplies a source control signal to the source drive ICs 140.

FIG. 3 is a plan view schematically illustrating a first substrate of a display panel according to an exemplary embodiment, FIG. 4 is a cross-sectional view illustrating an example of II of FIG. 3, and FIG. 5 is a diagram of II-II of FIG. 3. It is a cross-sectional view showing an example.

3 to 5, the first substrate 111 is divided into a display area DA and a non-display area NDA. A first sub-pixel P1, a second sub-pixel P2, and a third sub-pixel P3 may be provided in the display area DA of the first substrate 111. The first sub-pixel P1 emits red light, the second sub-pixel P2 emits green light, and the third sub-pixel P3 may be provided to emit blue light, but is limited thereto. It is not. A fourth sub-pixel emitting white (W) light may be further provided in the display area DA of the substrate 111. Alternatively, a fifth sub-pixel emitting yellow (YG) light may be further provided in the display area DA of the substrate 111. In addition, the arrangement order of each of the sub-pixels P1, P2, and P3 may be variously changed.

Hereinafter, for convenience of description, the first sub-pixel P1 emits red light, the second sub-pixel P2 emits green light, and the third sub-pixel P3 emits blue light. Assume and explain.

The display panel 110 according to an exemplary embodiment of the present invention includes a first emission layer 320 and a second emission layer in each of the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3. 340 is provided. In the display panel 110 according to the exemplary embodiment, each of the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 is a first emission layer 320 and a second emission layer. It is characterized in that only any one of (340) emits light.

Specifically, in the first sub-pixel P1 and the second sub-pixel P2, only the first emission layer 320 of the first emission layer 320 and the second emission layer 340 may emit light. Meanwhile, in the third sub-pixel P3, only the second emission layer 340 of the first emission layer 320 and the second emission layer 340 may emit light. In this case, if the second emission layer 340 emits blue light, the third sub-pixel P3 may be a blue sub-pixel that emits blue light. Meanwhile, the first emission layer 320 may emit yellow light. In such a case, the first sub-pixel P1 may become a red sub-pixel that emits red light by arranging a red color filter in a path through which light is emitted. The second sub-pixel P2 may become a green sub-pixel that emits green light by arranging a green color filter in a path through which light is emitted.

Meanwhile, in the display panel 110 according to an exemplary embodiment of the present invention, a first electrode 310, a second electrode 330, and a third electrode are respectively provided in the first sub-pixel P1 and the second sub-pixel P2. 350 is provided. The display panel 110 according to an embodiment of the present invention electrically connects the second electrode 330 and the third electrode 350 provided in each of the first sub-pixel P1 and the second sub-pixel P2. Let it. Accordingly, the display panel 110 according to the exemplary embodiment of the present invention includes a first emission layer among the first emission layer 320 and the second emission layer 340 in the first sub-pixel P1 and the second sub-pixel P2. Only 320 can emit light.

The display panel 110 according to an embodiment of the present invention electrically connects the second electrode 330 and the third electrode 350 provided in each of the first sub-pixel P1 and the second sub-pixel P2. To do this, as shown in FIG. 3, a first undercut structure region UCA1 is formed on at least one side of each of the first sub-pixel P1 and the second sub-pixel P2.

Each of the first sub-pixel P1 and the second sub-pixel P2 includes a first emission layer 320, a second electrode 330, and a second emission layer in the first undercut structure area UCA1 as shown in FIG. 4. 340 and the third electrode 350 are disconnected.

In addition, each of the first sub-pixel P1 and the second sub-pixel P2 is connected to the second electrode 330 and the third electrode 350 in the first undercut structure area UCA1. The second electrode 330 and the third electrode 350 provided in each of the first sub-pixel P1 and the second sub-pixel P2 are applied with the same first voltage. Accordingly, in each of the first sub-pixel P1 and the second sub-pixel P2, the second emission layer 340 provided between the second electrode 330 and the third electrode 350 does not emit light. Only the first emission layer 320 provided between the electrode 310 and the second electrode 330 emit light.

Meanwhile, in the display panel 110 according to an exemplary embodiment, the second electrode 330 and the third electrode 350 are provided in the third sub-pixel P3. In the display panel 110 according to the exemplary embodiment, the first electrode 310 is not disposed on the third sub-pixel P3. Accordingly, in the third sub-pixel P3, the first emission layer 320 provided between the second electrode 330 and the substrate 111 does not emit light.

Unlike the first sub-pixel P1 and the second sub-pixel P2, the display panel 110 according to the exemplary embodiment of the present invention has a second electrode 330 and a third electrode provided in the third sub-pixel P3. The electrode 350 is not electrically connected. That is, different voltages are applied to the second electrode 330 and the third electrode 350 provided in the third sub-pixel P3.

In the display panel 110 according to the exemplary embodiment of the present invention, as illustrated in FIG. 3, a second undercut structure region UCA2 is formed to surround the third sub-pixel P3. In the third sub-pixel P3, the first emission layer 320 and the second electrode 330 are disconnected in the second undercut structure area UCA2 as shown in FIG. 4, and the second emission layer 340 and the third The electrode 350 is connected.

In the third sub-pixel P3, the second electrode 330 and the third electrode 350 are disposed to be spaced apart from each other with the second emission layer 340 interposed therebetween. The third electrode 350 of the third sub-pixel P3 is connected to the third electrode 350 of the adjacent sub-pixels P1 and P2, so that the same first voltage may be applied thereto. Meanwhile, a second voltage different from the first voltage may be applied to the second electrode 330 of the third sub-pixel P3. Accordingly, in the third sub-pixel P3, the second emission layer 340 provided between the second electrode 330 and the third electrode 350 emit light.

Meanwhile, the auxiliary power line 360 may be provided in the non-display area NDA of the first substrate 111.

Specifically, the auxiliary power line 360 may be formed to extend in the first direction (X-axis direction) in the non-display area NDA. As shown in FIG. 5, the auxiliary power line 360 is exposed without being covered with layers 260 and 270 made of insulating material in the non-display area NDA, and can be connected to the third electrode 350 in the exposed area. I can.

The auxiliary power line 360 may be formed of the same material on the same layer as any one of the active layer, the gate electrode, the source electrode, and the drain electrode of the thin film transistor 230, but is not limited thereto. The auxiliary power line 360 may be formed between the thin film transistor 230 and the substrate 111.

Hereinafter, the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 will be described in detail with reference to FIGS. 6 to 11.

6 is a plan view schematically illustrating a first sub-pixel and a first undercut area according to an exemplary embodiment, and FIG. 7 is a cross-sectional view illustrating an example of III-III of FIG. 6.

6 and 7, in the display panel 110 according to an exemplary embodiment of the present invention, a first sub-pixel P1 is provided in the display area DA, and at least one of the first sub-pixels P1 is The first undercut structure region UCA1 is disposed on the side.

The first sub-pixel P1 includes a light blocking layer 210, a first insulating layer 220, a thin film transistor 231, a second insulating layer 260, and a third insulating layer 270 provided on the first substrate 111. , A first electrode 311, a bank 315, a first emission layer 321, a second electrode 331, a second emission layer 341, and a third electrode 351.

The first substrate 111 may be made of glass or plastic, but is not limited thereto, and may be made of a semiconductor material such as a silicon wafer. The first substrate 111 may be made of a transparent material or an opaque material.

The display device according to the exemplary embodiment of the present invention may be formed in a so-called bottom emission method in which the emitted light is emitted downward, but is not limited thereto. When the display device according to an exemplary embodiment of the present invention is formed in a bottom emission type, a transparent material may be used for the first substrate 111. On the other hand, when the display device according to an embodiment of the present invention is made of a top emission method in which the emitted light is emitted upward, the first substrate 111 may be formed of an opaque material as well as a transparent material. have.

Circuit elements including various signal lines, thin film transistors 230, and capacitors are provided on the first substrate 111 for each of the sub-pixels P1, P2, and P3. The signal lines may include a gate line, a data line, a power line, and a reference line.

The thin film transistor 230 is provided for each of the sub-pixels P1, P2, and P3. One thin film transistor 231 may be provided in the first sub-pixel P1.

When a gate signal is input to the gate line, the thin film transistor 230 supplies a predetermined voltage to the first electrode 311 according to the data voltage of the data line. The thin film transistor 230 includes an active layer, a gate electrode, a source electrode, and a drain electrode.

Specifically, an active layer is formed on the first substrate 111. The active layer may be formed of a silicon-based semiconductor material or an oxide-based semiconductor material. A light blocking layer 210 for blocking external light incident on the active layer may be formed between the first substrate 111 and the active layer. When the light blocking layer 210 is formed of a metal material, a first insulating layer 220 may be formed between the active layer and the light blocking layer 210.

A gate insulating layer may be formed on the active layer. The gate insulating layer may be formed of an inorganic layer, for example, a silicon oxide layer, a silicon nitride layer, or multiple layers thereof.

A gate electrode may be formed on the gate insulating layer. The gate electrode is made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof. It may be a single layer or multiple layers made, but is not limited thereto.

An interlayer insulating film may be formed on the gate electrode. The interlayer insulating film may be formed of an inorganic film, for example, a silicon oxide film, a silicon nitride film, or multiple films thereof.

A source electrode and a drain electrode may be formed on the interlayer insulating layer. Each of the source electrode and the drain electrode may be connected to the active layer through a contact hole penetrating through the gate insulating layer and the interlayer insulating layer. Each of the source electrode and the drain electrode is any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or It may be a single layer or multiple layers made of an alloy thereof, but is not limited thereto.

The second insulating layer 260 is formed on the thin film transistor 231. The second insulating layer 260 covers and protects the thin film transistor 231. The second insulating layer 260 may be formed of an inorganic layer, for example, a silicon oxide layer, a silicon nitride layer, or multiple layers thereof.

The third insulating layer 270 is formed on the second insulating layer 260 to flatten a step due to the thin film transistor 231. The third insulating film 270 is formed of an organic film such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, etc. Can be.

The first electrode 311 is patterned in the first sub-pixel P1 on the third insulating layer 270. The first electrode 311 is connected to the source electrode or the drain electrode of the thin film transistor 231 through a first contact hole CH1 penetrating the second insulating layer 260 and the third insulating layer 270, The above voltage can be applied.

The first electrode 311 may be made of a transparent metal material, a transflective metal material, or a metal material having a high reflectivity. When the display device 100 is formed in a bottom emission type, the first electrode 311 is a transparent metallic material such as ITO or IZO that can transmit light, or magnesium (Mg), silver ( Ag), or may be formed of a semi-transmissive conductive material such as an alloy of magnesium (Mg) and silver (Ag). When the display device 100 is made of a top emission type, the first electrode 311 is a laminated structure of aluminum and titanium (Ti/Al/Ti), a laminated structure of aluminum and ITO (ITO/Al/ITO), and Ag alloy , And a metal material having a high reflectivity such as a stacked structure of Ag alloy and ITO (ITO/Ag alloy/ITO). The Ag alloy may be an alloy such as silver (Ag), palladium (Pd), and copper (Cu). The first electrode 311 may be an anode electrode.

The bank 315 may be formed on the third insulating layer 270 to cover an end of the first electrode 311. Accordingly, it is possible to prevent a decrease in luminous efficiency due to the concentration of current at the end of the first electrode 311.

The bank 315 defines the emission area EA1 of the first sub-pixel P1. That is, the exposed area of the exposed first electrode 311 without the bank 315 formed in the first sub-pixel P1 becomes the light emitting area EA1.

The bank 315 may be formed of an inorganic insulating layer having a relatively thin thickness, but may be formed of an organic insulating layer having a relatively thick thickness.

The first emission layer 321 is formed on the first electrode 311. More specifically, the first emission layer 321 may be formed on the first electrode 311 and may also be formed on the bank 315.

The first emission layer 321 may include a hole transporting layer, a first color light emitting layer emitting light of a first color, and an electron transporting layer. In this case, in the first emission layer 321, holes and electrons move to the first color emission layer through the hole transport layer and the electron transport layer, respectively, and are combined with each other in the first color emission layer to emit light in a predetermined color.

The first emission layer 321 may include any one of a red emission layer emitting red light, a green emission layer emitting green light, a blue emission layer emitting blue light, and a yellow emission layer emitting yellow light, but is limited thereto. It doesn't work.

The second electrode 331 is formed on the first emission layer 321. The second electrode 331 is a transparent metallic material such as ITO or IZO that can transmit light (TCO), or magnesium (Mg), silver (Ag), or magnesium (Mg) and silver (Ag). It may be formed of a semi-transmissive conductive material such as an alloy of. The second electrode 331 provided in the first sub-pixel P1 may be a cathode electrode.

The second emission layer 341 is formed on the second electrode 331. The second emission layer 341 may include a hole transporting layer, a second light emitting layer emitting second color light, and an electron transporting layer. In this case, in the second emission layer 341, holes and electrons move to the second color emission layer through the hole transport layer and the electron transport layer, respectively, and are combined with each other in the second color emission layer to emit light in a predetermined color.

The second emission layer 341 may include any one of a red emission layer emitting red light, a green emission layer emitting green light, a blue emission layer emitting blue light, and a yellow emission layer emitting yellow light, but is limited thereto. It doesn't work.

However, the second emission layer 341 may emit light of a different color than the first emission layer 321. When the first emission layer 321 emits light of a first color, the second emission layer 341 may emit light of a second color different from the first color. For example, the first emission layer 321 may include a yellow emission layer that emits yellow light, and the second emission layer 341 may include a blue emission layer that emits blue light.

The third electrode 351 is formed on the second emission layer 341. The third electrode 351 may be made of a transparent metal material, a transflective metal material, or a metal material having a high reflectivity. When the display device 100 is formed in a bottom emission type, the third electrode 351 is a laminated structure of aluminum and titanium (Ti/Al/Ti), a laminated structure of aluminum and ITO (ITO/Al/ITO), and Ag alloy , And a metal material having a high reflectivity such as a stacked structure of Ag alloy and ITO (ITO/Ag alloy/ITO). The Ag alloy may be an alloy such as silver (Ag), palladium (Pd), and copper (Cu). When the display device 100 is made of a top emission type, the third electrode 351 is a transparent metallic material such as ITO and IZO that can transmit light, or magnesium (Mg), silver ( Ag), or may be formed of a semi-transmissive conductive material such as an alloy of magnesium (Mg) and silver (Ag). The third electrode 351 provided in the first sub-pixel P1 may be a cathode electrode.

The display panel 110 according to an exemplary embodiment of the present invention is characterized in that the second electrode 331 and the third electrode 351 of the first sub-pixel P1 are connected in the first undercut structure area UCA1. do.

In the display panel 110 including the first sub-pixel P1 as described above, the first undercut structure region UCA1 is disposed on at least one side of the first sub-pixel P1.

In FIG. 6, the first undercut structure area UCA1 is shown to be disposed on each of the first side of the first sub-pixel P1 and the second side facing the first side, but is not limited thereto. Here, the first side of the first sub-pixel P1 represents the side facing the adjacent second sub-pixel P2, and the second side of the first sub-pixel P1 is the side facing the adjacent third sub-pixel P3. Can indicate side.

In another embodiment, the first undercut structure region UCA1 may not be disposed so as to surround the first sub-pixel P1, and may be disposed anywhere between the first sub-pixel P1 and other adjacent sub-pixels. have.

For example, the first undercut structure area UCA1 includes a first side of the first sub-pixel P1, a second side facing the first side, and a third side and a fourth side connecting the first side and the second side. It may be disposed on at least one of the sides.

In addition, the first undercut structure area UCA1 may be disposed on at least one side of each of all the first sub-pixels P1 provided in the display area DA, but is not limited thereto. The first undercut structure area UCA1 may be disposed only on at least one side of some of all the first sub-pixels P1 provided in the display area DA.

Hereinafter, for convenience of description, the first undercut structure region UCA1 is disposed on each of the first side of the first sub-pixel P1 and the second side facing the first side, as shown in FIG. 6. Assume and explain. That is, one first undercut structure area UCA1 is disposed on the first side of the first sub-pixel P1, and another first undercut structure area UCA1 is disposed on the second side of the first sub-pixel P1. Can be placed.

A first lower layer 261 and a first upper layer 281 having a first undercut structure are disposed in each of the first undercut structure regions UCA1. In an embodiment, a first connection electrode 241 may be further disposed in each of the first undercut structure regions UCA1.

The first connection electrode 241 is patterned on at least one side of the first sub-pixel P1 on the first substrate 111. For example, the first connection electrode 241 may be patterned on each of the first side and the second side of the first sub-pixel P1 on the first substrate 111.

The first connection electrode 241 electrically connects the second electrode 331 and the third electrode 351 of the first sub-pixel P1 and the second electrode 330 and the third electrode 350 of the adjacent sub-pixel. I can connect.

For example, one first connection electrode 241 provided on the first side of the first sub-pixel P1 is a second electrode 331 and a third electrode 351 of the first sub-pixel P1. 2 The second electrode 332 and the third electrode 352 of the sub-pixel P2 may be electrically connected.

Specifically, a portion of the top surface of one first connection electrode 241 provided on the first side of the first sub-pixel P1 may be exposed. One of the second electrode 332 and the third electrode 352 of the second sub-pixel P2 may be connected to the exposed upper surface of the first connection electrode 241. At this time, since the second electrode 332 and the third electrode 352 of the second sub-pixel P2 are electrically connected, one first connection electrode 241 is a second electrode of the second sub-pixel P2. It may be electrically connected to the electrode 332 and the third electrode 352.

Meanwhile, one first connection electrode 241 is connected to the second electrode 331 and the third electrode 351 of the first sub-pixel P1 through the second contact hole CH2 and the first upper layer 281. Can be electrically connected.

As a result, one first connection electrode 241 is the second electrode 331 of the first sub-pixel P1 and the second electrode 332 of the second sub-pixel P2 adjacent to the third electrode 351. And the third electrode 352 may be electrically connected.

The first connection electrode 241 may be formed of the same material on the same layer as any one of the active layer, the gate electrode, the source electrode, and the drain electrode of the thin film transistor 231.

The first lower layer 261 of the first undercut structure may be the same layer as the second insulating layer 260. That is, a part of the second insulating layer 260 may become the first lower layer 261 of the first undercut structure. The first lower layer 261 is formed on the first connection electrode 241 to expose a part of the first connection electrode 241. More specifically, the first lower layer 261 may include a first opening area OA1 exposing a part of the first connection electrode 241.

The first lower layer 261 of the first undercut structure may be formed of a plurality of layers. For example, the first lower layer 261 of the first undercut structure may include a first layer 261a and a second layer 261b as shown in FIG. 7, but is not limited thereto. The first lower layer 261 of the first undercut structure may be formed of three or more layers.

The first layer 261a may be the same layer as the second insulating layer 260. That is, a part of the second insulating layer 260 may become the first layer 261a of the first lower layer 261. The first layer 261a may be provided to extend from the first sub-pixel P1 to the first undercut structure area UCA1. The first layer 261a is formed to expose a part of the first connection electrode 241 on the first connection electrode 241 provided in the first undercut structure area UCA1.

The second layer 261b is formed on the first layer 261a. In this case, the second layer 261b is formed to expose a part of the first connection electrode 241 on the first layer 261a. Accordingly, a part of the first connection electrode 241 may still be exposed.

The second layer 261b may be provided only in the first undercut structure region UCA1. That is, the second layer 261b is not provided in the first sub-pixel P1, and the third insulating layer 270 provided in the first sub-pixel P1 may be in contact with a side surface.

The first upper layer 281 of the first undercut structure is formed on the first lower layer 261 to cover a part of the first opening area OA1 of the first lower layer 261. Specifically, the first upper layer 281 includes a first overlapping portion 281a formed to overlap the first lower layer 261 on the first lower layer 261. In addition, the first upper layer 281 includes a first protrusion 281b that protrudes to cover a part of the first opening area OA1 exposing a part of the first connection electrode 241. In this case, the first protrusion 281b of the first upper layer 281 is spaced apart from the first connection electrode 241 to form a space between the first connection electrode 241.

The first protrusion 281b of the first upper layer 281 protrudes from the first sub-pixel P1 toward the first opening area OA1 or is disposed adjacent to the first sub-pixel P1 It may protrude in a direction toward the first opening area OA1 in.

One first undercut structure area UCA1 may be provided between the first sub-pixel P1 and the second sub-pixel P2. In this case, the first upper layer 281 provided in one first undercut structure area UCA1 may protrude in a direction from the first sub-pixel P1 toward the first opening area OA1. Accordingly, a partial area of the first opening area OA1 disposed in one first undercut structure area UCA1 adjacent to the first sub-pixel P1 may be covered by the first upper layer 281. The first connection electrode 241 provided in the covered area may also be covered by the first upper layer 281. The remaining regions of the first opening region OA1 disposed in one first undercut structure region UCA1 adjacent to the second sub-pixel P2 may still expose the first connection electrode 241.

The other first undercut structure area UCA1 may be provided between the first sub-pixel P1 and the third sub-pixel P3. In this case, the first upper layer 281 provided in the other first undercut structure area UCA1 may protrude in a direction from the third sub-pixel P3 toward the first opening area OA1. Accordingly, a partial area adjacent to the third sub-pixel P3 among the first opening areas OA1 disposed in the other first undercut structure area UCA1 may be covered by the first upper layer 281. The first connection electrode 241 provided in the covered area may also be covered by the first upper layer 281. The remaining regions of the first opening region OA1 disposed in one first undercut structure region UCA1 adjacent to the second sub-pixel P2 may still expose the first connection electrode 241.

The first upper layer 281 of the first undercut structure may be made of a conductive material. The first upper layer 281 may be formed of the same material as the first electrode 311, but is not limited thereto.

The first upper layer 281 may be formed of the same material as the first electrode 311 at the same time. In this case, the first upper layer 281 is spaced apart from the first electrode 311 so as not to be electrically connected to the first electrode 311 of the first sub-pixel P1.

In this case, since the first upper layer 281 is formed of the same material as the first electrode 311 in the display panel 110 at the same time, the first upper layer 281 may be formed without adding a separate process.

However, the present invention is not limited thereto, and the first upper layer 281 may be formed of a material different from the first electrode 311. The first upper layer 281 may be formed of a conductive material, but is not limited to a specific material.

The first upper layer 281 may be connected to the first connection electrode 241 through a second contact hole CH2 penetrating the first lower layer 261. Since the first upper layer 281 is made of a conductive material as described above, the display panel 110 according to an exemplary embodiment of the present invention has a first upper layer 281 having a first undercut structure through the first upper layer 281. The electrodes disposed thereon and the electrodes disposed under the first upper layer 281 of the first undercut structure may be electrically connected.

More specifically, in the first undercut structure area UCA1, the first emission layer 321, the second electrode 331, the second emission layer 341, and the third electrode 351 of the first sub-pixel P1 are provided. Can be.

The first emission layer 321 provided in the first sub-pixel P1 may be disconnected in the first undercut structure area UCA1.

For example, one first undercut structure region UCA1 may be disposed between the first sub-pixel P1 and the second sub-pixel P2. The first emission layer 321 of the first sub-pixel P1 may be disconnected in one first undercut structure area UCA1.

Specifically, the first emission layer 321 of the first sub-pixel P1 may be disconnected between the first sub-pixel P1 and the second sub-pixel P2 due to the first undercut structure. When the first emission layer 320 is completely deposited without a mask, the first emission layer 321 deposited on the first sub-pixel P1 is formed with the first upper layer 281 having the first undercut structure as shown in FIG. 7. It may be broken on the first protrusion 281b of the first upper layer 281 due to a step difference between the first connection electrodes 241. The first emission layer 322 deposited on the second sub-pixel P2 flows into the space between the first protrusion 281b of the first upper layer 281 and the first connection electrode 241 as shown in FIG. 7. Thus, it may be formed under the first protrusion 281b of the first upper layer 281.

In the display panel 110 according to the exemplary embodiment of the present invention, the first emission layer 321 of the first sub-pixel P1 and the first emission layer 322 of the second sub-pixel P2 are disconnected without contacting each other. It is desirable. Accordingly, when the second electrodes 331 and 332 are deposited on the first emission layers 321 and 322, the second electrode 332 deposited on the second sub-pixel P2 is A space through which the first protrusion 281b and the first emission layer 322 of the second sub-pixel P2 can be introduced may be secured.

For another example, another first undercut structure region UCA1 may be disposed between the first sub-pixel P1 and the third sub-pixel P3. The first emission layer 321 may be disconnected from the other first undercut structure region UCA1.

Specifically, the first emission layer 321 may be disconnected between the first sub-pixel P1 and the third sub-pixel P3 due to the first undercut structure. When the first emission layer 320 is completely deposited without a mask, the first emission layer 324 deposited between the first sub-pixel P1 and the third sub-pixel P3 is a first undercut as shown in FIG. 7. Due to the step difference between the first upper layer 281 and the first connection electrode 241 of the structure, it may be broken on the first protrusion 281b of the first upper layer 281. The first emission layer 321 deposited on the first sub-pixel P1 flows into the space between the first protrusion 281b of the first upper layer 281 and the first connection electrode 241 as shown in FIG. 7. As a result, it may be formed under the first protrusion 281b of the first upper layer 281.

In the display panel 110 according to the exemplary embodiment of the present invention, the first emission layer 321 of the first sub-pixel P1 and the first emission layer 323 of the third sub-pixel P3 do not contact each other and are disconnected. It is desirable. Accordingly, when the second electrodes 331 and 333 are deposited on the first emission layers 321 and 323, the second electrode 331 deposited on the first sub-pixel P1 is A space through which the first protrusion 281b and the first emission layer 321 of the first sub-pixel P1 can be introduced may be secured.

The second electrode 331 provided in the first sub-pixel P1 may be disconnected in the first undercut structure area UCA1.

For example, the second electrode 331 may be disconnected in one first undercut structure area UCA1. Specifically, the second electrode 331 may be disconnected between the first sub-pixel P1 and the second sub-pixel P2 due to the first undercut structure. When the second electrode 330 is completely deposited without a mask, the second electrode 331 deposited on the first sub-pixel P1 is formed with the first upper layer 281 having the first undercut structure as shown in FIG. 7. It may be broken on the first protrusion 281b of the first upper layer 281 due to the step difference between the first connection electrodes 241. The second electrode 331 deposited on the first sub-pixel P1 is cut off on the first protrusion 281b of the first upper layer 281 and is on the side of the first protrusion 281b of the first upper layer 281. Can be connected. Accordingly, the second electrode 331 of the first sub-pixel P1 may be electrically connected to the first upper layer 281.

The second electrode 322 deposited on the second sub-pixel P2 flows into the space between the first protrusion 281b of the first upper layer 281 and the first connection electrode 241 as shown in FIG. 7. As a result, it may be formed under the first protrusion 281b of the first upper layer 281.

For another example, the second electrode 331 may be disconnected from the other first undercut structure region UCA1. Specifically, the second electrode 331 may be disconnected between the first sub-pixel P1 and the third sub-pixel P3 due to the first undercut structure. When the second electrode 330 is completely deposited without a mask, the second electrode 333 deposited between the first sub-pixel P1 and the third sub-pixel P3 is a first undercut as shown in FIG. 7. Due to the step difference between the first upper layer 281 and the first connection electrode 241 of the structure, it may be broken on the first protrusion 281b of the first upper layer 281.

The second electrode 322 deposited on the first sub-pixel P1 flows into the space between the first protrusion 281b and the first connection electrode 241 of the first upper layer 281 as shown in FIG. 7. As a result, it may be formed under the first protrusion 281b of the first upper layer 281. In this case, the second electrode 331 of the first sub-pixel P1 may be deposited in a larger area than the first emission layer 321 under the first protrusion 281b of the first upper layer 281. Accordingly, the second electrode 331 of the first sub-pixel P1 may be connected to the first connection electrode 241.

The second emission layer 341 provided in the first sub-pixel P1 may be disconnected in the first undercut structure area UCA1.

For example, the second emission layer 341 may be disconnected in one first undercut structure region UCA1. Specifically, the second emission layer 341 may be disconnected between the first sub-pixel P1 and the second sub-pixel P2 by the first undercut structure. When the second emission layer 340 is entirely deposited without a mask, the second emission layer 341 deposited on the first sub-pixel P1 is formed with the first upper layer 281 having the first undercut structure as shown in FIG. 7. It may be broken on the first protrusion 281b of the first upper layer 281 due to the step difference between the first connection electrodes 241. The second emission layer 342 deposited on the second sub-pixel P2 flows into the space between the first protrusion 281b of the first upper layer 281 and the first connection electrode 241 as shown in FIG. 7. As a result, it may be formed under the first protrusion 281b of the first upper layer 281.

In the display panel 110 according to the exemplary embodiment of the present invention, the second emission layer 341 of the first sub-pixel P1 and the second emission layer 342 of the second sub-pixel P2 are disconnected without contacting each other. It is desirable. Accordingly, when the third electrodes 351 and 352 are deposited on the second emission layers 341 and 342, the third electrode 352 deposited on the second sub-pixel P2 is formed of the first upper layer 281. A space through which the first protrusion 281b and the second emission layer 342 of the second sub-pixel P2 can be introduced may be secured.

For another example, the second emission layer 341 may be disconnected from the other first undercut structure region UCA1. Specifically, the second emission layer 341 may be disconnected between the first sub-pixel P1 and the third sub-pixel P3 due to the first undercut structure. When the second emission layer 340 is entirely deposited without a mask, the second emission layer 344 deposited between the first sub-pixel P1 and the third sub-pixel P3 is a first undercut as shown in FIG. 7. Due to the step difference between the first upper layer 281 and the first connection electrode 241 of the structure, it may be broken on the first protrusion 281b of the first upper layer 281. The second emission layer 341 deposited on the first sub-pixel P1 flows into the space between the first protrusion 281b and the first connection electrode 241 of the first upper layer 281 as shown in FIG. 7. As a result, it may be formed under the first protrusion 281b of the first upper layer 281.

In the display panel 110 according to the exemplary embodiment, the second emission layer 341 of the first sub-pixel P1 and the second emission layer 343 of the third sub-pixel P3 do not contact each other and are disconnected. It is desirable. For this reason, when the third electrodes 351 and 353 are deposited on the second emission layers 341 and 343, the third electrode 351 deposited on the first sub-pixel P1 is A space through which the first protrusion 281b and the second emission layer 341 of the first sub-pixel P1 can be introduced may be secured.

The third electrode 351 provided in the first sub-pixel P1 may be disconnected in the first undercut structure area UCA1.

For example, the third electrode 351 may be disconnected in one first undercut structure area UCA1. Specifically, the third electrode 351 may be disconnected between the first sub-pixel P1 and the second sub-pixel P2 due to the first undercut structure. When the third electrode 350 is completely deposited without a mask, the third electrode 351 deposited on the first sub-pixel P1 is formed with the first upper layer 281 having the first undercut structure as shown in FIG. 7. It may be broken on the first protrusion 281b of the first upper layer 281 due to the step difference between the first connection electrodes 241. The third electrode 351 deposited on the first sub-pixel P1 may be disconnected from the first protrusion 281b of the first upper layer 281 and connected to the second electrode 331. Accordingly, the third electrode 351 of the first sub-pixel P1 may be electrically connected to the second electrode 331 of the first sub-pixel P1.

The third electrode 352 deposited on the second sub-pixel P2 flows into the space between the first protrusion 281b of the first upper layer 281 and the first connection electrode 241 as shown in FIG. 7. As a result, it may be formed under the first protrusion 281b of the first upper layer 281.

For another example, the third electrode 351 may be disconnected from the other first undercut structure region UCA1. Specifically, the third electrode 351 may be disconnected between the first sub-pixel P1 and the third sub-pixel P3 due to the first undercut structure. When the third electrode 350 is completely deposited without a mask, the third electrode 353 deposited between the first sub-pixel P1 and the third sub-pixel P3 is a first undercut as shown in FIG. 7. Due to the step difference between the first upper layer 281 and the first connection electrode 241 of the structure, it may be broken on the first protrusion 281b of the first upper layer 281.

The third electrode 352 deposited on the first sub-pixel P1 flows into the space between the first protrusion 281b and the first connection electrode 241 of the first upper layer 281 as shown in FIG. 7. As a result, it may be formed under the first protrusion 281b of the first upper layer 281. In this case, the third electrode 351 of the first sub-pixel P1 may be deposited in a larger area than the second emission layer 341 under the first protrusion 281b of the first upper layer 281. Accordingly, the third electrode 351 of the first sub-pixel P1 may be connected to the second electrode 331.

As described above, in the display panel 110 according to the exemplary embodiment of the present invention, the second electrode 331 and the third electrode 351 of the first sub-pixel P1 are in the first undercut structure area UCA1. Can be connected. Accordingly, the same voltage may be applied to the second electrode 331 and the third electrode 351 of the first sub-pixel P1. When a low potential voltage is applied to the third electrode 351 of the first sub-pixel P1 through the auxiliary power line 360, the second electrode 331 of the first sub-pixel P1 becomes the first sub-pixel ( The same low potential voltage as the third electrode 351 of P1) may be applied. In this case, the second electrode 331 of the first sub-pixel P1 may be a cathode electrode together with the third electrode 351 of the first sub-pixel P1.

Accordingly, in the first sub-pixel P1, the second emission layer 341 provided between the second electrode 331 and the third electrode 351 does not emit light. On the other hand, in the first sub-pixel P1, when a first high potential voltage is applied to the first electrode 311 and a low potential voltage is applied to the second electrode 331 and the third electrode 351, the first electrode The first emission layer 321 provided between the 311 and the second electrode 331 emits light with a predetermined brightness according to a predetermined current.

Meanwhile, in the display panel 110 according to the exemplary embodiment, the second electrode 331 and the third electrode 351 of the first sub-pixel P1 are formed in the plurality of first undercut structure regions UCA1. Can be connected in parallel.

Specifically, in the display panel 110 according to the exemplary embodiment, the second electrode 331 and the third electrode 351 of the first sub-pixel P1 are formed in one first undercut structure area UCA1. You can connect. For example, in the display panel 110 according to an embodiment of the present invention, the second electrode 331 and the third electrode 351 of the first sub-pixel P1 are one first undercut structure area UCA1. The first connection C1 may be made on the first undercut structure disposed in the.

In addition, in the display panel 110 according to an exemplary embodiment, the second electrode 331 and the third electrode 351 of the first sub-pixel P1 are different from each other in the first undercut structure area UCA1. You can connect. For example, in the display panel 110 according to an exemplary embodiment of the present invention, the second electrode 331 and the third electrode 351 of the first sub-pixel P1 are different from one first undercut structure area UCA1. A second connection C2 may be made under the first undercut structure disposed in ).

As described above, the display panel 110 according to the exemplary embodiment of the present invention reduces the resistance of the cathode electrode by connecting the second electrode 331 and the third electrode 351 of the first sub-pixel P1 in parallel. I can make it.

One of the second electrode 331 and the third electrode 351 of the first sub-pixel P1 may be made of a metal material having high resistance, and the other may be made of a metal material having low resistance. For example, the second electrode 331 may be made of a metal material having high resistance, such as IZO, and the third electrode 351 may be made of a metal material having low resistance, such as Al. In this case, by connecting the second electrode 331 and the third electrode 351 configured as the cathode electrode in parallel, the resistance of the cathode electrode may be reduced.

Furthermore, the display panel 110 according to an exemplary embodiment of the present invention includes a second electrode 331 and a third electrode 351 adjacent to the second electrode 331 and the third electrode 351 of the first sub-pixel P1 in the first undercut structure area UCA1. 2 It may be connected to the second electrode 332 and the third electrode 352 of the sub-pixel P2.

Specifically, the second electrode 331 of the first sub-pixel P1 may be connected to a side surface of the first protrusion 281b of the first upper layer 281. The first upper layer 281 may be connected to the first connection electrode 241 through a second contact hole CH2 penetrating the first lower layer 261. The first connection electrode 241 may have a third connection C3 with the second electrode 332 of the second sub-pixel P2 adjacent to the first opening area OA1. Also, the second electrode 332 of the second sub-pixel P2 may be formed up to the lower surface of the first protrusion 281a of the first upper layer 281 while rising along the side surface of the first lower layer 261. In this case, the second electrode 332 of the second sub-pixel P2 may have the first upper layer 281 and the fourth connection C4.

Accordingly, the second electrode 331 and the third electrode 351 of the first sub-pixel P1 are the first of the second sub-pixel P2 through the first upper layer 281 and the first connection electrode 241. It may be electrically connected to the second electrode 332 and the third electrode 352.

As described above, the display panel 110 according to the exemplary embodiment of the present invention includes the second and third electrodes 331 and 351 of the first sub-pixel P1, and the second sub-pixel P2. A plurality of connections C1, C2, C3, and C4 are made between the second electrode 332 and the third electrode 352. Through this, the display panel 110 according to the exemplary embodiment of the present invention may reduce the resistance of the cathode electrode. Furthermore, the display panel 110 according to an exemplary embodiment of the present invention includes the second electrodes 331 and 332 and the third electrodes 351 and 352 in the first sub-pixel P1 and the second sub-pixel P2. The electrical connection between them can be made stably.

FIG. 8 is a plan view schematically illustrating a second sub-pixel, a first undercut area, and a second undercut area according to an exemplary embodiment, and FIG. 9 is a cross-sectional view illustrating an example of IV-IV of FIG. 8.

8 and 9, in the display panel 110 according to an exemplary embodiment of the present invention, a second sub-pixel P2 is provided in the display area DA, and at least one of the second sub-pixels P2 is The first undercut structure region UCA1 is disposed on the side. When the second sub-pixel P2 is disposed adjacent to the third sub-pixel P3, the second undercut structure region UCA2 is disposed between the second sub-pixel P2 and the third sub-pixel P3. I can.

The second sub-pixel P2 includes a light blocking layer 210, a first insulating layer 220, a thin film transistor 232, a second insulating layer 260, and a third insulating layer 270 provided on the first substrate 111. , A first electrode 312, a bank 315, a first emission layer 322, a second electrode 332, a second emission layer 342, and a third electrode 352.

Circuit elements including various signal lines, thin film transistors 230, and capacitors are provided on the first substrate 111 for each of the sub-pixels P1, P2, and P3. The signal lines may include a gate line, a data line, a power line, and a reference line.

The thin film transistor 230 is provided for each of the sub-pixels P1, P2, and P3. Another thin film transistor 232 may be provided in the second sub-pixel P2.

When a gate signal is input to the gate line, the thin film transistor 230 supplies a predetermined voltage to the first electrode 312 according to the data voltage of the data line. The thin film transistor 230 includes an active layer, a gate electrode, a source electrode, and a drain electrode. Since a detailed description of the configuration of the thin film transistor 230 is the same as described above, it will be omitted.

The second insulating layer 260 is formed on the thin film transistor 232. The second insulating layer 260 covers and protects the thin film transistor 232. The second insulating layer 260 may be formed of an inorganic layer, for example, a silicon oxide layer, a silicon nitride layer, or multiple layers thereof.

The third insulating layer 270 is formed on the second insulating layer 260 to flatten a step due to the thin film transistor 232. The third insulating film 270 is formed of an organic film such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, etc. Can be.

The first electrode 312 is patterned in the second sub-pixel P2 on the third insulating layer 270. The first electrode 312 is connected to the source electrode or the drain electrode of the thin film transistor 232 through a first contact hole CH1 penetrating the second insulating layer 260 and the third insulating layer 270, The above voltage can be applied.

The first electrode 312 may be made of a transparent metal material, a transflective metal material, or a metal material having a high reflectivity. When the display device 100 is formed in a bottom emission type, the first electrode 312 is a transparent metallic material such as ITO or IZO that can transmit light, or magnesium (Mg), silver ( Ag), or may be formed of a semi-transmissive conductive material such as an alloy of magnesium (Mg) and silver (Ag). When the display device 100 is made of a top emission type, the first electrode 312 is a laminated structure of aluminum and titanium (Ti/Al/Ti), a laminated structure of aluminum and ITO (ITO/Al/ITO), and Ag alloy , And a metal material having a high reflectivity such as a stacked structure of Ag alloy and ITO (ITO/Ag alloy/ITO). The Ag alloy may be an alloy such as silver (Ag), palladium (Pd), and copper (Cu). The first electrode 312 may be an anode electrode.

The bank 315 may be formed on the third insulating layer 270 to cover an end of the first electrode 312. Accordingly, it is possible to prevent a decrease in luminous efficiency due to the concentration of current at the end of the first electrode 312.

The bank 315 defines the emission area EA2 of the second sub-pixel P2. That is, the exposed area of the exposed first electrode 312 without the bank 315 formed in the second sub-pixel P2 becomes the emission area EA2.

The bank 315 may be formed of an inorganic insulating layer having a relatively thin thickness, but may be formed of an organic insulating layer having a relatively thick thickness.

The first emission layer 322 is formed on the first electrode 312. More specifically, the first emission layer 322 may be formed on the first electrode 312 and may also be formed on the bank 315.

The first emission layer 322 may include a hole transporting layer, a first color light emitting layer emitting light of a first color, and an electron transporting layer. In this case, in the first emission layer 322, holes and electrons move to the first color emission layer through the hole transport layer and the electron transport layer, respectively, and are combined with each other in the first color emission layer to emit light in a predetermined color.

The first emission layer 322 may include any one of a red emission layer emitting red light, a green emission layer emitting green light, a blue emission layer emitting blue light, and a yellow emission layer emitting yellow light, but is limited thereto. It doesn't work.

The second electrode 332 is formed on the first emission layer 322. The second electrode 332 is a transparent metallic material such as ITO or IZO that can transmit light (TCO), or magnesium (Mg), silver (Ag), or magnesium (Mg) and silver (Ag). It may be formed of a semi-transmissive conductive material such as an alloy of. The second electrode 332 provided in the second sub-pixel P2 may be a cathode electrode.

The second emission layer 342 is formed on the second electrode 332. The second emission layer 342 may include a hole transporting layer, a second color emission layer emitting second color light, and an electron transporting layer. In this case, in the second emission layer 342, holes and electrons move to the second color emission layer through the hole transport layer and the electron transport layer, respectively, and are combined with each other in the second color emission layer to emit light in a predetermined color.

The second emission layer 342 may include any one of a red emission layer emitting red light, a green emission layer emitting green light, a blue emission layer emitting blue light, and a yellow emission layer emitting yellow light, but is limited thereto. It doesn't work.

However, the second emission layer 342 may emit light of a different color than the first emission layer 322. When the first emission layer 322 emits light of a first color, the second emission layer 342 may emit light of a second color different from the first color. For example, the first emission layer 322 may include a yellow emission layer that emits yellow light, and the second emission layer 342 may include a blue emission layer that emits blue light.

The third electrode 352 is formed on the second emission layer 342. The third electrode 352 may be made of a transparent metal material, a transflective metal material, or a metal material having a high reflectivity. When the display device 100 is made of a bottom emission type, the third electrode 352 is a laminated structure of aluminum and titanium (Ti/Al/Ti), a laminated structure of aluminum and ITO (ITO/Al/ITO), and Ag alloy , And a metal material having a high reflectivity such as a stacked structure of Ag alloy and ITO (ITO/Ag alloy/ITO). The Ag alloy may be an alloy such as silver (Ag), palladium (Pd), and copper (Cu). When the display device 100 is made of a top emission type, the third electrode 352 is a transparent metallic material such as ITO or IZO that can transmit light, or magnesium (Mg), silver ( Ag), or may be formed of a semi-transmissive conductive material such as an alloy of magnesium (Mg) and silver (Ag). The third electrode 352 provided in the second sub-pixel P2 may be a cathode electrode.

The display panel 110 according to an exemplary embodiment of the present invention is characterized in that the second electrode 332 and the third electrode 352 of the second sub-pixel P2 are connected in the first undercut structure area UCA1. do.

In the display panel 110 including the second sub-pixel P2 as described above, the first undercut structure region UCA1 is disposed on at least one side of the second sub-pixel P2.

8 illustrates that the first undercut structure region UCA1 is disposed on the second side of the second sub-pixel P2, but is not limited thereto. In another embodiment, the first undercut structure region UCA1 may not be disposed so as to surround the second sub-pixel P2, and may be disposed anywhere between the second sub-pixel P2 and other adjacent sub-pixels. have.

For example, the first undercut structure area UCA1 includes a first side of the second sub-pixel P2, a second side facing the first side, and a third side and a fourth side connecting the first side and the second side. It may be disposed on at least one of the sides. Here, the first side of the second sub-pixel P2 represents the side facing the adjacent third sub-pixel P3, and the second side of the second sub-pixel P2 is the side facing the adjacent first sub-pixel P1. Can indicate side.

In addition, the first undercut structure area UCA1 may be disposed on at least one side of each of all the second sub-pixels P2 provided in the display area DA, but is not limited thereto. The first undercut structure area UCA1 may be disposed only on at least one side of some of all the second sub-pixels P2 provided in the display area DA.

Hereinafter, for convenience of description, it is assumed that the first undercut structure region UCA1 is disposed on the second side of the second sub-pixel P2 as illustrated in FIG. 8. Further, the description will be made on the assumption that the second undercut structure region UCA2 formed to surround the adjacent third sub-pixel P3 is disposed on the first side of the second sub-pixel P2.

A first lower layer 260 and a first upper layer 281 having a first undercut structure are disposed in the first undercut structure area UCA1 disposed on the second side of the second sub-pixel P2. In an embodiment, a first connection electrode 241 may be further disposed in each of the first undercut structure regions UCA1.

The first connection electrode 241 is patterned on at least one side of the second sub-pixel P2 on the first substrate 111. For example, the first connection electrode 241 may be patterned on the second side of the second sub-pixel P2 on the first substrate 111. That is, the first connection electrode 241 may be patterned between the first sub-pixel P1 and the second sub-pixel P2.

The first connection electrode 241 includes the second electrode 332 of the second sub-pixel P2 and the second electrode 331 and the third electrode of the first sub-pixel P1 adjacent to the third electrode 352. 351) can be electrically connected.

For example, the first connection electrode 241 provided on the second side of the second sub-pixel P2 is a first sub-pixel adjacent to the second electrode 332 and the third electrode 352 of the second sub-pixel P2. The second electrode 331 and the third electrode 351 of the pixel P1 may be electrically connected.

Specifically, a portion of the upper surface of the first connection electrode 241 provided on the second side of the second sub-pixel P2 may be exposed. One of the second electrode 332 and the third electrode 352 of the second sub-pixel P2 may be connected to the exposed upper surface of the first connection electrode 241. At this time, since the second electrode 332 and the third electrode 352 of the second sub-pixel P2 are electrically connected, the first connection electrode 241 is the second electrode of the second sub-pixel P2 ( 332 and the third electrode 352 may be electrically connected.

Meanwhile, the first connection electrode 241 is electrically connected to the second electrode 331 and the third electrode 351 of the first sub-pixel P1 through the second contact hole CH2 and the first upper layer 281. Can be connected.

As a result, the first connection electrode 241 includes the second electrode 332 of the second sub-pixel P2 and the second electrode 331 of the first sub-pixel P1 adjacent to the third electrode 352 and the second electrode 331 of the second sub-pixel P2. 3 The electrode 351 can be electrically connected.

The first connection electrode 241 may be formed of the same material on the same layer as any one of the active layer, the gate electrode, the source electrode, and the drain electrode of the thin film transistor 232.

The first lower layer 261 of the first undercut structure may be the same layer as the second insulating layer 260. That is, a part of the second insulating layer 260 may become the first lower layer 261 of the first undercut structure. The first lower layer 261 is formed on the first connection electrode 241 to expose a part of the first connection electrode 241. More specifically, the first lower layer 261 may include a first opening area OA1 exposing a part of the first connection electrode 241.

The first lower layer 261 of the first undercut structure may be formed of a plurality of layers. For example, the first lower layer 261 of the first undercut structure may include a first layer 261a and a second layer 261b as illustrated in FIG. 9, but is not limited thereto. The first lower layer 261 of the first undercut structure may be formed of three or more layers.

The first layer 261a may be provided to extend from the first sub-pixel P1 to the first undercut structure area UCA1. The first layer 261a is formed to expose a part of the first connection electrode 241 on the first connection electrode 241 provided in the first undercut structure area UCA1.

The second layer 261b is formed on the first layer 261a. In this case, the second layer 261b is formed to expose a part of the first connection electrode 241 on the first layer 261a. Accordingly, a part of the first connection electrode 241 may still be exposed.

The second layer 261b may be provided only in the first undercut structure region UCA1. That is, the second layer 261b may not be provided in the first sub-pixel P1 and the second sub-pixel P2.

The first upper layer 281 of the first undercut structure is formed on the first lower layer 261 to cover a part of the first opening area OA1 of the first lower layer 261. Specifically, the first upper layer 281 includes a first overlapping portion 281a formed to overlap the first lower layer 261 on the first lower layer 261. In addition, the first upper layer 281 includes a first protrusion 281b that protrudes to cover a part of the first opening area OA1 exposing a part of the first connection electrode 241. In this case, the first protrusion 281b of the first upper layer 281 is spaced apart from the first connection electrode 241 to form a space between the first connection electrode 241.

The first protrusion 281b of the first upper layer 281 may protrude in a direction from the first sub-pixel P1 adjacent to the second sub-pixel P2 toward the first opening area OA1.

The first undercut structure area UCA1 may be provided between the first sub-pixel P1 and the second sub-pixel P2. In this case, the first upper layer 281 provided in the first undercut structure area UCA1 may protrude in a direction from the first sub-pixel P1 toward the first opening area OA1. Accordingly, a partial area of the first opening area OA1 disposed in the first undercut structure area UCA1 adjacent to the first sub-pixel P1 may be covered by the first upper layer 281. The first connection electrode 241 provided in the covered area may also be covered by the first upper layer 281. The remaining regions of the first opening region OA1 disposed in the first undercut structure region UCA1 adjacent to the second sub-pixel P2 may still expose the first connection electrode 241.

The first upper layer 281 of the first undercut structure may be made of a conductive material. The first upper layer 281 may be formed of the same material as the first electrode 312, but is not limited thereto. The first upper layer 281 may be formed of the same material as the first electrode 312 at the same time.

In this case, since the first upper layer 281 is formed of the same material as the first electrode 312 in the display panel 110 at the same time, the first upper layer 281 may be formed without adding a separate process.

However, it is not necessarily limited thereto, and the first upper layer 281 may be formed of a material different from the first electrode 312. The first upper layer 281 may be formed of a conductive material, but is not limited to a specific material.

The first upper layer 281 may be connected to the first connection electrode 241 through a second contact hole CH2 penetrating the first lower layer 261. Since the first upper layer 281 is made of a conductive material as described above, the display panel 110 according to an exemplary embodiment of the present invention has a first upper layer 281 having a first undercut structure through the first upper layer 281. The electrodes disposed thereon and the electrodes disposed under the first upper layer 281 of the first undercut structure may be electrically connected.

More specifically, a first emission layer 322, a second electrode 332, a second emission layer 342, and a third electrode 352 of the second sub-pixel P2 are provided in the first undercut structure area UCA1. Can be.

The first emission layer 322 provided in the second sub-pixel P2 may be disconnected in the first undercut structure area UCA1.

For example, the first undercut structure region UCA1 may be disposed between the second sub-pixel P2 and the first sub-pixel P1. The first emission layer 322 of the second sub-pixel P2 may be disconnected in the first undercut structure area UCA1.

Specifically, the first emission layer 321 of the second sub-pixel P2 may be disconnected between the first sub-pixel P1 and the second sub-pixel P2 due to the first undercut structure. When the first emission layer 320 is completely deposited without a mask, the first emission layer 321 deposited on the first sub-pixel P1 is formed with the first upper layer 281 having the first undercut structure as shown in FIG. 9. It may be broken on the first protrusion 281b of the first upper layer 281 due to the step difference between the first connection electrodes 241. The first emission layer 322 deposited on the second sub-pixel P2 flows into the space between the first protrusion 281b of the first upper layer 281 and the first connection electrode 241 as shown in FIG. 9. As a result, it may be formed under the first protrusion 281b of the first upper layer 281.

In the display panel 110 according to the exemplary embodiment of the present invention, the first emission layer 321 of the first sub-pixel P1 and the first emission layer 322 of the second sub-pixel P2 are disconnected without contacting each other. It is desirable. Accordingly, when the second electrodes 331 and 332 are deposited on the first emission layers 321 and 322, the second electrode 332 deposited on the second sub-pixel P2 is A space through which the first protrusion 281b and the first emission layer 322 of the second sub-pixel P2 can be introduced may be secured.

The second electrode 332 provided in the second sub-pixel P2 may be disconnected in the first undercut structure area UCA1.

For example, the second electrode 332 may be disconnected in the first undercut structure region UCA1. Specifically, the second electrode 332 may be disconnected between the first sub-pixel P1 and the second sub-pixel P2 due to the first undercut structure. When the second electrode 330 is completely deposited without a mask, the second electrode 331 deposited on the first sub-pixel P1 is formed with the first upper layer 281 having the first undercut structure as shown in FIG. 9. It may be broken on the first protrusion 281b of the first upper layer 281 due to the step difference between the first connection electrodes 241.

The second electrode 322 deposited on the second sub-pixel P2 flows into the space between the first protrusion 281b of the first upper layer 281 and the first connection electrode 241 as shown in FIG. 9. As a result, it may be formed under the first protrusion 281b of the first upper layer 281. In this case, the second electrode 332 of the second sub-pixel P2 may be deposited in a larger area than the first emission layer 322 under the first protrusion 281b of the first upper layer 281. Accordingly, the second electrode 332 of the second sub-pixel P2 may be connected to the first connection electrode 241.

The second emission layer 342 provided in the second sub-pixel P2 may be disconnected in the first undercut structure area UCA1.

For example, the second emission layer 342 may be disconnected in the first undercut structure region UCA1. Specifically, the second emission layer 342 may be disconnected between the first sub-pixel P1 and the second sub-pixel P2 due to the first undercut structure. When the second emission layer 340 is completely deposited without a mask, the second emission layer 341 deposited on the first sub-pixel P1 is formed with the first upper layer 281 having the first undercut structure as shown in FIG. 9. It may be broken on the first protrusion 281b of the first upper layer 281 due to the step difference between the first connection electrodes 241. The second emission layer 342 deposited on the second sub-pixel P2 flows into the space between the first protrusion 281b of the first upper layer 281 and the first connection electrode 241 as shown in FIG. 9. As a result, it may be formed under the first protrusion 281b of the first upper layer 281.

In the display panel 110 according to the exemplary embodiment of the present invention, the second emission layer 341 of the first sub-pixel P1 and the second emission layer 342 of the second sub-pixel P2 are disconnected without contacting each other. It is desirable. Accordingly, when the third electrodes 351 and 352 are deposited on the second emission layers 341 and 342, the third electrode 352 deposited on the second sub-pixel P2 is formed of the first upper layer 281. A space through which the first protrusion 281b and the second emission layer 342 of the second sub-pixel P2 can be introduced may be secured.

The third electrode 352 provided in the second sub-pixel P2 may be disconnected in the first undercut structure area UCA1.

For example, the third electrode 352 may be disconnected in the first undercut structure region UCA1. Specifically, the third electrode 352 may be disconnected between the first sub-pixel P1 and the second sub-pixel P2 due to the first undercut structure. When the third electrode 350 is completely deposited without a mask, the third electrode 351 deposited on the first sub-pixel P1 is formed with the first upper layer 281 having the first undercut structure as shown in FIG. 9. It may be broken on the first protrusion 281b of the first upper layer 281 due to the step difference between the first connection electrodes 241.

The third electrode 352 deposited on the second sub-pixel P2 flows into the space between the first protrusion 281b of the first upper layer 281 and the first connection electrode 241 as shown in FIG. 9. As a result, it may be formed under the first protrusion 281b of the first upper layer 281. In this case, the third electrode 352 of the second sub-pixel P2 may be deposited in a larger area than the second emission layer 342 under the first protrusion 281b of the first upper layer 281. Accordingly, the third electrode 352 of the second sub-pixel P2 may be connected to the second electrode 332.

As described above, in the display panel 110 according to the exemplary embodiment, the second electrode 332 and the third electrode 352 of the second sub-pixel P2 are in the first undercut structure area UCA1. Can be connected. Accordingly, the same voltage may be applied to the second electrode 332 and the third electrode 352 of the second sub-pixel P2. When a low potential voltage is applied to the third electrode 352 of the second sub-pixel P2 through the auxiliary power line 360, the second electrode 332 of the second sub-pixel P2 becomes a second sub-pixel ( The same low potential voltage as the third electrode 352 of P2) may be applied. In this case, the second electrode 332 of the second sub-pixel P2 may be a cathode electrode together with the third electrode 352 of the second sub-pixel P2.

Accordingly, in the second sub-pixel P2, the second emission layer 342 provided between the second electrode 332 and the third electrode 352 does not emit light. On the other hand, in the second sub-pixel P2, when a second high potential voltage is applied to the first electrode 312 and a low potential voltage is applied to the second electrode 332 and the third electrode 352, the first electrode The first emission layer 322 provided between the 312 and the second electrode 332 emits light with a predetermined brightness according to a predetermined current.

Meanwhile, in the display panel 110 according to the exemplary embodiment, the second electrode 332 and the third electrode 352 of the second sub-pixel P2 are adjacent to each other in the first undercut structure area UCA1. It may be connected to the second electrode 331 and the third electrode 351 of the sub-pixel P1.

Specifically, the second electrode 331 of the first sub-pixel P1 may be connected to a side surface of the first protrusion 281b of the first upper layer 281. The first upper layer 281 may be connected to the first connection electrode 241 through a second contact hole CH2 penetrating the first lower layer 261. The first connection electrode 241 may have a third connection C3 with the second electrode 332 of the second sub-pixel P2 adjacent to the first opening area OA1. Also, the second electrode 332 of the second sub-pixel P2 may be formed up to the lower surface of the first protrusion 281a of the first upper layer 281 while rising along the side surface of the first lower layer 261. In this case, the second electrode 332 of the second sub-pixel P2 may have the first upper layer 281 and the fourth connection C4. In addition, the second electrode 332 and the third electrode 352 of the second sub-pixel P2 may have a second connection C2 under the first protrusion 281a of the first upper layer 281.

As described above, the display panel 110 according to the exemplary embodiment of the present invention includes the second and third electrodes 331 and 351 of the first sub-pixel P1, and the second sub-pixel P2. A plurality of connections C2, C3, and C4 are made between the second electrode 332 and the third electrode 352. Through this, the display panel 110 according to the exemplary embodiment of the present invention may reduce the resistance of the cathode electrode. One of the second electrode 332 and the third electrode 352 of the second sub-pixel P2 may be made of a metal material having high resistance, and the other may be made of a metal material having low resistance. For example, the second electrode 332 may be made of a metal material having high resistance, such as IZO, and the third electrode 352 may be made of a metal material having low resistance, such as Al. In this case, by connecting the second electrode 332 and the third electrode 352 configured as the cathode electrode in parallel, the resistance of the cathode electrode may be reduced.

Furthermore, the display panel 110 according to an exemplary embodiment of the present invention includes the second electrodes 331 and 332 and the third electrodes 351 and 352 in the first sub-pixel P1 and the second sub-pixel P2. The electrical connection between them can be made stably.

Meanwhile, a second undercut structure region UCA2 formed to surround the adjacent third sub-pixel P3 may be disposed on the first side of the second sub-pixel P2. A first emission layer 322, a second electrode 332, a second emission layer 342, and a third electrode 352 of the second sub-pixel P2 may be provided in the second undercut structure area UCA2.

The first emission layer 322 and the second electrode 332 provided in the second sub-pixel P2 may be disconnected in the second undercut structure area UCA2. The second emission layer 342 and the third electrode 352 provided in the second sub-pixel P2 include a second emission layer 343 provided in the third sub-pixel P3 in the second undercut structure area UCA2, and It may be connected to the third electrode 353.

Hereinafter, the second undercut area will be described in more detail with reference to FIGS. 10 and 11.

FIG. 10 is a plan view schematically illustrating a third sub-pixel, a first undercut area, and a second undercut area according to an exemplary embodiment, and FIG. 11 is a cross-sectional view illustrating an example of V-V of FIG. 10.

10 and 11, the display panel 110 according to an exemplary embodiment includes a third sub-pixel P3 in a display area DA, and surrounds the third sub-pixel P3. The second undercut structure area UCA2 is disposed.

In the third sub-pixel P3, the light blocking layer 210, the first insulating layer 220, the thin film transistor 232, the second insulating layer 260, the bank 315, and the first insulating layer 220 are provided on the first substrate 111. It includes a first emission layer 322, a second electrode 332, a second emission layer 342, and a third electrode 352.

Circuit elements including various signal lines, thin film transistors 230, and capacitors are provided on the first substrate 111 for each of the sub-pixels P1, P2, and P3. The signal lines may include a gate line, a data line, a power line, and a reference line.

The thin film transistor 230 is provided for each of the sub-pixels P1, P2, and P3. Another thin film transistor (not shown) may be provided in the third sub-pixel P3.

When a gate signal is input to the gate line, the thin film transistor 230 supplies a predetermined voltage to the first electrode 312 according to the data voltage of the data line. The thin film transistor 230 includes an active layer, a gate electrode, a source electrode, and a drain electrode. Since a detailed description of the configuration of the thin film transistor 230 is the same as described above, it will be omitted.

The second insulating layer 260 is formed on a thin film transistor (not shown). The second insulating layer 260 covers and protects the thin film transistor. The second insulating layer 260 may be formed of an inorganic layer, for example, a silicon oxide layer, a silicon nitride layer, or multiple layers thereof.

The display panel 110 according to an exemplary embodiment of the present invention is characterized in that the third insulating layer and the first electrode are not formed on the third sub-pixel P3. Accordingly, the display panel 110 according to the exemplary embodiment may improve transmittance in the third sub-pixel P3. In particular, when the display panel 110 is formed in a bottom emission type, the third sub-pixel P3 does not have to pass the light emitted from the second emission layer 343 through the third insulating layer and the first electrode, thereby improving light efficiency. Can be improved.

The bank 315 may be formed on the second insulating layer 260. 11 illustrates that the bank 315 is provided on the second insulating layer 260, but the present invention is not limited thereto. The bank 315 may not be formed in the third sub-pixel P3. Since the first electrode is not formed in the third sub-pixel P3, the bank 315 covering the end of the first electrode may not also be formed. In this case, the emission area EA3 of the third sub-pixel P3 may be larger than the emission area EA1 of the first sub-pixel P1 and the emission area EA2 of the second sub-pixel P2. That is, the third sub-pixel P3 may have a larger emission area and an aperture ratio than the first sub-pixel P1 and the second sub-pixel P2.

The first emission layer 323 is formed on the second insulating layer 260. More specifically, the first emission layer 323 may be formed on the second insulating layer 260 and may also be formed on the bank 315.

The first emission layer 323 may include a hole transporting layer, a first color light emitting layer emitting light of a first color, and an electron transporting layer. In this case, in the first emission layer 323, holes and electrons move to the first color emission layer through the hole transport layer and the electron transport layer, respectively, and are combined with each other in the first color emission layer to emit light in a predetermined color.

The first emission layer 323 may include any one of a red emission layer emitting red light, a green emission layer emitting green light, a blue emission layer emitting blue light, and a yellow emission layer emitting yellow light, but is limited thereto. It doesn't work.

The second electrode 333 is formed on the first emission layer 323. The second electrode 333 is a transparent metallic material such as ITO or IZO that can transmit light (TCO), or magnesium (Mg), silver (Ag), or magnesium (Mg) and silver (Ag). It may be formed of a semi-transmissive conductive material such as an alloy of. The second electrode 333 provided in the third sub-pixel P3 may be an anode electrode.

The second emission layer 343 is formed on the second electrode 333. The second emission layer 343 may include a hole transporting layer, a second color emission layer emitting second color light, and an electron transporting layer. In this case, in the second emission layer 343, holes and electrons move to the second color emission layer through the hole transport layer and the electron transport layer, respectively, and are combined with each other in the second color emission layer to emit light in a predetermined color.

The second emission layer 343 may include any one of a red emission layer emitting red light, a green emission layer emitting green light, a blue emission layer emitting blue light, and a yellow emission layer emitting yellow light, but is limited thereto. It doesn't work.

However, the second emission layer 343 may emit light of a different color than the first emission layer 323. When the first emission layer 323 emits light of a first color, the second emission layer 343 may emit light of a second color different from the first color. For example, the first emission layer 323 may include a yellow emission layer that emits yellow light, and the second emission layer 343 may include a blue emission layer that emits blue light.

The third electrode 353 is formed on the second emission layer 343. The third electrode 353 may be made of a transparent metal material, a transflective metal material, or a metal material having a high reflectivity. When the display device 100 is made of a bottom emission type, the third electrode 353 is a laminated structure of aluminum and titanium (Ti/Al/Ti), a laminated structure of aluminum and ITO (ITO/Al/ITO), and Ag alloy , And a metal material having a high reflectivity such as a stacked structure of Ag alloy and ITO (ITO/Ag alloy/ITO). The Ag alloy may be an alloy such as silver (Ag), palladium (Pd), and copper (Cu). When the display device 100 is made of a top emission type, the third electrode 353 is a transparent metallic material such as ITO and IZO that can transmit light, or magnesium (Mg), silver ( Ag), or may be formed of a semi-transmissive conductive material such as an alloy of magnesium (Mg) and silver (Ag). The third electrode 353 provided in the third sub-pixel P3 may be a cathode electrode.

In the display panel 110 according to an exemplary embodiment, the second undercut structure area UCA2 is disposed to surround the third sub-pixel P3.

A second lower layer 262 and a second upper layer 272 having a second undercut structure may be disposed in the second undercut structure area UCA2, and a second connection electrode 242 may be further disposed.

The second connection electrode 242 may be formed on the first substrate 111 to surround the third sub-pixel P3, but is not limited thereto. The second connection electrode 242 may be patterned on at least one side of the third sub-pixel P3. The second connection electrode 242 may be electrically connected to the second electrode 333 of the third sub-pixel P3.

Specifically, a portion of the upper surface of the second connection electrode 242 formed to surround the third sub-pixel P3 may be exposed. The second connection electrode 242 may be connected to the second electrode 333 of the third sub-pixel P3 on the exposed upper surface.

The second connection electrode 242 may be any one of a source electrode and a drain electrode of the third thin film transistor.

The second lower layer 262 of the second undercut structure may be the same layer as the second insulating layer 260. That is, a part of the second insulating layer 260 may become the second lower layer 262 of the second undercut structure. The second lower layer 262 may be disposed to be spaced apart from the same layer as the second insulating layer 260 provided in the third sub-pixel P3.

The second lower layer 262 is formed on the second connection electrode 242 to expose a part of the second connection electrode 242. More specifically, the second lower layer 262 may include a second opening area OA2 exposing a portion of the second connection electrode 242. In this case, the second opening area OA2 may be formed to surround the third sub-pixel P3 like the second connection electrode 242.

Unlike the first lower layer 261 of the first undercut structure, the second lower layer 262 of the second undercut structure may be formed of a single layer, but is not limited thereto. The second lower layer 262 of the second undercut structure may be formed of a plurality of layers having a number smaller than that of the first lower layer 261 of the first undercut structure.

The second upper layer 272 of the second undercut structure may be the same layer as the third insulating layer 270. That is, a part of the third insulating layer 270 may become the second upper layer 272 of the second undercut structure.

The second upper layer 272 of the second undercut structure is formed on the second lower layer 262 to cover a part of the second opening area OA2 of the second lower layer 262. Specifically, the second upper layer 272 includes a second overlapping portion 272a formed on the second lower layer 262 to overlap the second lower layer 262. In addition, the second upper layer 272 includes a second protrusion 272b that protrudes to cover a part of the second opening area OA2 exposing a part of the second connection electrode 242. At this time, the second protrusion 272b of the second upper layer 272 is spaced apart from the second connection electrode 242 to form a space between the second connection electrode 242 and the second connection electrode 242.

The second protrusion 272b of the second upper layer 272 is a second opening area OA2 in each of the second sub-pixel P2 and the first sub-pixel P3 disposed adjacent to the third sub-pixel P3 It can protrude in the direction toward.

The second undercut structure area UCA2 may be provided between the third sub-pixel P3 and the second sub-pixel P2. In this case, the second upper layer 272 provided in the second undercut structure area UCA2 may protrude in a direction from the second sub-pixel P2 toward the second opening area OA2. Accordingly, a partial area of the second opening area OA2 disposed in the second undercut structure area UCA2 adjacent to the second sub-pixel P2 may be covered by the second upper layer 272. The second connection electrode 242 provided in the covered area may also be covered by the second upper layer 272. The remaining area of the second opening area OA2 disposed in the second undercut structure area UCA2 adjacent to the third sub-pixel P3 may still expose the second connection electrode 242.

The second undercut structure area UCA2 may be provided between the third sub-pixel P3 and the first sub-pixel P1. In this case, the second upper layer 272 provided in the second undercut structure area UCA2 may protrude in a direction from the first sub-pixel P1 toward the second opening area OA2. Accordingly, a partial area of the second opening area OA2 disposed in the second undercut structure area UCA2 adjacent to the first sub-pixel P1 may be covered by the second upper layer 272. The second connection electrode 242 provided in the covered area may also be covered by the second upper layer 272. The remaining area of the second opening area OA2 disposed in the second undercut structure area UCA2 adjacent to the third sub-pixel P3 may still expose the second connection electrode 242.

The second upper layer 272 of the second undercut structure may be made of a non-conductive material. The second upper layer 272 may be formed of the same material as the third insulating layer 270.

In this case, since the second upper layer 272 is formed of the same material as the third insulating layer 270 in the display panel 110 at the same time, the second upper layer 272 may be formed without adding a separate process.

The display panel 110 according to the exemplary embodiment may electrically connect the second electrode 333 of the third sub-pixel P3 to the second connection electrode 242 using the second undercut structure. .

More specifically, the first emission layer 323, the second electrode 333, the second emission layer 343, and the third electrode 353 of the third sub-pixel P3 are provided in the second undercut structure area UCA2. Can be.

The first emission layer 323 provided in the third sub-pixel P3 may be disconnected in the second undercut structure area UCA2.

For example, the second undercut structure region UCA2 may be disposed between the third sub-pixel P3 and the second sub-pixel P2. The first emission layer 323 of the third sub-pixel P3 may be disconnected in the second undercut structure area UCA2.

Specifically, the first emission layer 323 of the third sub-pixel P3 may be disconnected between the third sub-pixel P3 and the second sub-pixel P2 due to the second undercut structure. When the first emission layer 320 is completely deposited without a mask, the first emission layer 322 deposited on the second sub-pixel P2 is formed with the second upper layer 272 of the second undercut structure as shown in FIG. 11. It may be cut off on the second protrusion 272b of the second upper layer 272 due to the step difference between the second connection electrodes 242. The first emission layer 323 deposited on the third sub-pixel P3 flows into the space between the second protrusion 272b of the second upper layer 272 and the second connection electrode 242 as shown in FIG. 11. Thus, it may be formed under the second protrusion 272b of the second upper layer 272.

In the display panel 110 according to the exemplary embodiment of the present invention, the first emission layer 323 of the third sub-pixel P3 and the first emission layer 322 of the second sub-pixel P2 do not contact each other and are disconnected. It is desirable. Accordingly, when the second electrodes 333 and 332 are deposited on the first emission layers 323 and 322, the second electrode 333 deposited on the third sub-pixel P3 is formed of the second upper layer 272. A space through which the second protrusion 272b and the first emission layer 322 of the second sub-pixel P2 can be introduced may be secured.

Also, a second undercut structure region UCA2 may be disposed between the third sub-pixel P3 and the first sub-pixel P1. The first emission layer 323 of the third sub-pixel P3 may be disconnected in the second undercut structure area UCA2.

Specifically, the first emission layer 323 of the third sub-pixel P3 may be disconnected between the third sub-pixel P3 and the first sub-pixel P1 due to the second undercut structure. When the first emission layer 320 is completely deposited without a mask, the first emission layer 324 deposited between the first sub-pixel P1 and the third sub-pixel P3 is a second undercut as shown in FIG. 11. Due to the step difference between the second upper layer 272 and the second connection electrode 242 of the structure, it may be cut off on the second protrusion 272b of the second upper layer 272. The first emission layer 323 deposited on the third sub-pixel P3 flows into the space between the second protrusion 272b of the second upper layer 272 and the second connection electrode 242 as shown in FIG. 11. Thus, it may be formed under the second protrusion 272b of the second upper layer 272.

The display panel 110 according to an exemplary embodiment of the present invention includes a first emission layer 323 of the third sub-pixel P3, and a second layer deposited between the first sub-pixel P1 and the third sub-pixel P3. 1 It is preferable that the light emitting layers 324 are disconnected without contacting each other. For this reason, when the second electrodes 333 and 334 are deposited on the first emission layers 323 and 324, the second electrode 333 deposited on the third sub-pixel P3 is formed of the second upper layer 272. A space through which the second protrusion 272b and the first emission layer 324 between the first sub-pixel P1 and the third sub-pixel P3 can be introduced may be secured.

The second electrode 333 provided in the third sub-pixel P3 may be disconnected in the second undercut structure area UCA2.

For example, the second electrode 333 may be disconnected in the second undercut structure region UCA2 disposed between the third sub-pixel P3 and the second sub-pixel P2. Specifically, the second electrode 333 may be disconnected between the third sub-pixel P3 and the second sub-pixel P2 due to the second undercut structure. When the second electrode 330 is completely deposited without a mask, the second electrode 332 deposited on the second sub-pixel P2 is formed with the second upper layer 272 having the second undercut structure as shown in FIG. 11. It may be cut off on the second protrusion 272b of the second upper layer 272 due to the step difference between the second connection electrodes 242.

The second electrode 323 deposited on the third sub-pixel P3 flows into the space between the second protrusion 272b of the second upper layer 272 and the second connection electrode 242 as shown in FIG. 11. Thus, it may be formed under the second protrusion 272b of the second upper layer 272. In this case, the second electrode 333 of the third sub-pixel P3 may be deposited in a larger area than the first emission layer 323 under the second protrusion 272b of the second upper layer 272. Accordingly, the second electrode 333 of the third sub-pixel P3 may be connected to the second connection electrode 242.

Also, the second electrode 333 may be disconnected in the second undercut structure region UCA2 disposed between the third sub-pixel P3 and the first sub-pixel P1. Specifically, the second electrode 333 may be disconnected between the third sub-pixel P3 and the first sub-pixel P1 due to the second undercut structure. When the second electrode 330 is completely deposited without a mask, the second electrode 334 deposited between the first sub-pixel P1 and the third sub-pixel P3 is a second undercut as shown in FIG. 11. Due to the step difference between the second upper layer 272 and the second connection electrode 242 of the structure, it may be cut off on the second protrusion 272b of the second upper layer 272.

The second electrode 333 deposited on the third sub-pixel P3 flows into the space between the second protrusion 272b of the second upper layer 272 and the second connection electrode 242 as shown in FIG. 11. Thus, it may be formed under the second protrusion 272b of the second upper layer 272. In this case, the second electrode 333 of the third sub-pixel P3 may be deposited in a larger area than the first emission layer 323 under the second protrusion 272b of the second upper layer 272. Accordingly, the second electrode 333 of the third sub-pixel P3 may be connected to the second connection electrode 242.

As described above, in the third sub-pixel P3, the second electrode 333 is connected to the second connection electrode 242. The second connection electrode 242 may be a source electrode or a drain electrode of a third thin film transistor. In this case, the second electrode 333 of the third sub-pixel P3 is directly connected to the second connection electrode 242, so that a third high potential voltage may be applied. In this case, the second electrode 333 of the third sub-pixel P3 may be an anode electrode.

In the display panel 110 according to the exemplary embodiment, the second undercut structure region UCA2 is formed to surround the third sub-pixel P3, so that the second electrode 333 of the third sub-pixel P3 is The second electrode 331 of the first sub-pixel P1 and the second electrode 332 of the second sub-pixel P2 may not be electrically connected to each other.

As described above, in the first and second sub-pixels P1 and P2, the second electrodes 331 and 332 may be cathode electrodes. On the other hand, in the third sub-pixel P3, the second electrode 333 may be an anode electrode. In this case, when the second electrodes 331 and 332 of the first and second sub-pixels P1 and P2 come into contact with the second electrode 333 of the third sub-pixel P3, the first and second sub-pixels A short circuit occurs between the second electrodes 331 and 332 of the (P1, P2) and the second electrode 333 of the third sub-pixel P3, so that the display device 100 cannot be driven normally.

The second emission layer 343 provided in the third sub-pixel P3 may be connected in the second undercut structure area UCA1.

For example, the second emission layer 343 may be connected in the second undercut structure region UCA2 disposed between the third sub-pixel P3 and the second sub-pixel P2. The second emission layer 343 provided in the third sub-pixel P3 may be connected to the second emission layer 342 provided in the second sub-pixel P2 in the second undercut structure area UCA2. The second emission layer 343 provided in the third sub-pixel P3 may be formed by partially filling the space between the second upper layer 272 and the second electrode 333 having the second undercut structure. In this case, an air gap AG, which is a space not filled with the second emission layer 343, may be formed between the second upper layer 272 and the second electrode 333 of the second undercut structure.

Also, the second emission layer 343 may be connected in the second undercut structure region UCA2 disposed between the third sub-pixel P3 and the first sub-pixel P1. The second emission layer 343 provided in the third sub-pixel P3 is a second emission layer 344 provided between the first sub-pixel P1 and the third sub-pixel P3 in the second undercut structure area UCA2. ) Can be connected. The second emission layer 343 may be formed while partially filling the space between the second upper layer 272 and the second electrode 333 of the second undercut structure. In this case, an air gap AG, which is a space not filled with the second emission layer 343, may be formed between the second upper layer 272 and the second electrode 333 of the second undercut structure.

The third electrode 353 provided in the third sub-pixel P3 may be connected in the second undercut structure area UCA2.

For example, the third electrode 353 may be connected in the second undercut structure area UCA2 disposed between the third sub-pixel P3 and the second sub-pixel P2. The third electrode 353 provided in the third sub-pixel P3 may be connected to the third electrode 352 provided in the second sub-pixel P2 in the second undercut structure area UCA2. Accordingly, the third electrode 353 provided in the third sub-pixel P3 may be electrically connected to the third electrode 352 provided in the second sub-pixel P2.

Also, the third electrode 353 may be connected in the second undercut structure area UCA2 disposed between the third sub-pixel P3 and the first sub-pixel P1. The third electrode 353 provided in the third sub-pixel P3 is a third electrode 354 provided between the first sub-pixel P1 and the third sub-pixel P3 in the second undercut structure area UCA2. ) Can be connected. Accordingly, the third electrode 353 provided in the third sub-pixel P3 may be electrically connected to the third electrode 354 provided between the first sub-pixel P1 and the third sub-pixel P3. have.

As described above, the third electrode 352 provided in the second sub-pixel P2 is electrically connected to the second electrode 332 provided in the second sub-pixel P2. In addition, the third electrode 352 and the second electrode 332 provided in the second sub-pixel P2 are formed with the third electrode 351 and the second electrode 331 provided in the first sub-pixel P1. It is electrically connected.

In addition, the third electrode 354 provided between the first sub-pixel P1 and the third sub-pixel P3 may be electrically connected to the third electrode 351 provided in the first sub-pixel P1. .

As a result, the third electrode 351 and the second electrode 331 provided in the first sub-pixel P1, and the third electrode 352 and the second electrode 332 provided in the second sub-pixel P2 And, all of the third electrodes 353 provided in the third sub-pixel P3 are electrically connected, so that the same voltage may be applied.

As described above, in the display panel 110 according to the exemplary embodiment, the second electrode 333 and the second connection electrode 242 of the third sub-pixel P3 are the second undercut structure area UCA2. Can be connected in. Accordingly, the third high potential voltage may be applied to the second electrode 333 of the third sub-pixel P3 through the second connection electrode 242. In this case, the second electrode 333 of the third sub-pixel P3 may be an anode electrode.

In addition, in the display panel 110 according to an exemplary embodiment, the third electrode 353 of the third sub-pixel P3 is provided in the first sub-pixel P1 and the third electrode 351 and the second The same voltage as the electrode 331 and the third electrode 352 and the second electrode 332 provided in the second sub-pixel P2 may be applied. A low potential voltage may be applied to the third electrode 353 of the third sub-pixel P3 through the auxiliary power line 360. In this case, the third electrode 353 of the third sub-pixel P3 may be a cathode electrode.

Accordingly, in the third sub-pixel P3, the second emission layer 342 provided between the second electrode 333 and the third electrode 353 emits light with a predetermined brightness according to a predetermined current.

12 is a cross-sectional view showing a first undercut structure area and a second undercut structure area.

Referring to FIG. 12, a first lower layer 261 and a first upper layer 281 having a first undercut structure are disposed in the first undercut structure region UCA1. A second lower layer 262 and a second upper layer 272 having a second undercut structure are disposed in the second undercut structure area UCA2.

The display panel 110 according to an exemplary embodiment of the present invention is characterized in that the first lower layer 261 of the first undercut structure and the second lower layer 262 of the second undercut structure have different thicknesses.

Specifically, the first lower layer 261 of the first undercut structure may be formed of a plurality of layers. For example, the first lower layer 261 of the first undercut structure may include a first layer 261a and a second layer 261b as shown in FIG. 12.

The first layer 261a may be the same layer as the second insulating layer 260. That is, a part of the second insulating layer 260 may become the first layer 261a of the first lower layer 261.

The second layer 261b may be patterned only on the first undercut structure region UCA1 on the first layer 261a.

The first lower layer 261 may have a third thickness T3 obtained by adding the first thickness T1 of the first layer 261a and the second thickness T2 of the second layer 261b.

Meanwhile, the second lower layer 262 of the second undercut structure may be formed of one layer, unlike the first lower layer 261 of the first undercut structure. The second lower layer 262 may be the same layer as the second insulating layer 260. That is, a part of the second insulating layer 260 may become the second lower layer 262.

The second lower layer 262 may have the same thickness as the first thickness T1 of one layer.

Since the first lower layer 261 of the first undercut structure has a third thickness (T3) that is the sum of the first thickness (T1) and the second thickness (T2), it is thicker than the second lower layer 262 of the second undercut structure. Is thick. Accordingly, the separation distance between the first upper layer 281 of the first undercut structure and the first connection electrode 241 is greater than the separation distance between the second upper layer 272 and the second connection electrode 242 of the second undercut structure. I can.

In the display panel 110 according to the exemplary embodiment of the present invention, since the separation distance between the first upper layer 281 of the first undercut structure and the first connection electrode 241 is large, the first emission layer ( 320) and the second electrode 330, as well as the second emission layer 340 and the third electrode 350 are disconnected.

On the other hand, in the display panel 110 according to the exemplary embodiment of the present invention, since the separation distance between the second upper layer 272 of the second undercut structure and the second connection electrode 242 is small, the first Only the emission layer 320 and the second electrode 330 are disconnected, and the second emission layer 340 and the third electrode 350 are connected.

The display panel 110 according to an embodiment of the present invention may connect the second electrode 331 and the third electrode 351 of the first sub-pixel P1 using the first undercut structure as described above. . The display panel 110 according to the exemplary embodiment may connect the second electrode 332 and the third electrode 352 of the second sub-pixel P2 using the first undercut structure as described above. . Meanwhile, in the display panel 110 according to an exemplary embodiment of the present invention, the second electrode 333 of the third sub-pixel P3 is adjacent to the second electrode of the other sub-pixels using the second undercut structure as described above. While disconnecting from the 330, the third electrode 353 of the third sub-pixel P3 may be connected to the third electrode 350 of other adjacent sub-pixels.

Meanwhile, in the display panel 110 according to an exemplary embodiment, the first upper layer 281 having the first undercut structure and the second upper layer 272 having the second undercut structure are made of different materials.

The first upper layer 281 of the first undercut structure may be made of a conductive material. The display panel 110 according to an embodiment of the present invention includes electrodes disposed on the first upper layer 281 having a first undercut structure and a first undercut structure through the first upper layer 281 made of a conductive material. 1 The electrodes disposed under the upper layer 281 may be electrically connected.

For example, in the display panel 110 according to the exemplary embodiment, the second electrode 331 and the third electrode 351 of the first sub-pixel P1 are adjacent to each other in the first undercut structure area UCA1. 2 It may be connected to the second electrode 332 and the third electrode 352 of the sub-pixel P2.

The second electrode 331 of the first sub-pixel P1 may be connected to a side surface of the first protrusion 281b of the first upper layer 281. The first upper layer 281 may be connected to the first connection electrode 241 through a second contact hole CH2 penetrating the first lower layer 261. The first connection electrode 241 may be connected to the second electrode 332 of the second sub-pixel P2 adjacent to the first opening area OA1. Also, the second electrode 332 of the second sub-pixel P2 may be formed up to the lower surface of the first protrusion 281a of the first upper layer 281 while rising along the side surface of the first lower layer 261. In this case, the second electrode 332 of the second sub-pixel P2 may be connected to the first upper layer 281.

Accordingly, the second electrode 331 and the third electrode 351 of the first sub-pixel P1 are the first of the second sub-pixel P2 through the first upper layer 281 and the first connection electrode 241. It may be electrically connected to the second electrode 332 and the third electrode 352.

The second upper layer 272 of the second undercut structure may be made of a non-conductive material. In the display panel 110 according to an exemplary embodiment of the present invention, even if electrodes disposed in each of the sub-pixels adjacent to the second upper layer 272 made of a non-conductive material are connected, the connected electrodes are not electrically connected.

For example, in the display panel 110 according to the exemplary embodiment of the present invention, the second electrode 333 of the third sub-pixel P3 may be disconnected due to the second undercut structure. At this time, the second electrode 333 of the third sub-pixel P3 flows into the space between the second upper layer 272 and the second connection electrode 242 of the second undercut structure, and is below the second upper layer 272. Can be formed in In addition, the second electrode 333 of the third sub-pixel P3 may be formed up to the lower surface of the second upper layer 272 while rising along the side surface of the second lower layer 262 of the second undercut structure.

Meanwhile, in the display panel 110 according to the exemplary embodiment, the second electrode 332 of the second sub-pixel P2 disposed adjacent to the third sub-pixel P3 is disconnected due to the second undercut structure. Can be. In this case, the second electrode 332 of the second sub-pixel P2 may be formed on the side surface of the second upper layer 272 while being cut off on the second upper layer 272 of the second undercut structure.

Since the second upper layer 272 of the second undercut structure is a non-conductive material, the display panel 110 according to the exemplary embodiment of the present invention is a second electrode of the third sub-pixel P3 in contact with the second upper layer 272. The 333 and the second electrode 332 of the second sub-pixel P2 may not be electrically connected.

13 is a diagram illustrating light emitted from each of first to third sub-pixels.

Referring to FIG. 13, in the display device 100 according to an exemplary embodiment of the present invention, the first emission layers 321, 322 and 323 and the second emission layers 341 and 342 are formed in each of the sub-pixels P1, P2, and P3. 343) can emit light.

More specifically, in the first sub-pixel P1, only the first emission layer 321 of the first emission layer 321 and the second emission layer 341 may emit light. In the first sub-pixel P1, the second electrode 331 and the third electrode 351 may be electrically connected in the first undercut structure area UCA1. The first sub-pixel P1 may apply the same voltage to the second electrode 331 and the third electrode 351 through the auxiliary power line 360. Accordingly, in the first sub-pixel P1, the second emission layer 341 provided between the second electrode 331 and the third electrode 351 does not emit light.

Meanwhile, in the first sub-pixel P1, when a first high potential voltage is applied to the first electrode 311 and a low potential voltage is applied to the second electrode 331 and the third electrode 351, the first electrode The first emission layer 321 provided between the 311 and the second electrode 331 may emit light L1 of the first color.

The second sub-pixel P2 may emit light only from the first emission layer 322 of the first emission layer 322 and the second emission layer 342. In the second sub-pixel P2, the second electrode 332 and the third electrode 352 may be electrically connected in the first undercut structure area UCA1. The second sub-pixel P2 may apply the same voltage to the second electrode 332 and the third electrode 352 through the auxiliary power line 360. Accordingly, in the second sub-pixel P2, the second emission layer 342 provided between the second electrode 332 and the third electrode 352 does not emit light.

Meanwhile, in the second sub-pixel P2, when a second high potential voltage is applied to the first electrode 312 and a low potential voltage is applied to the second electrode 332 and the third electrode 352, the first electrode The first emission layer 322 provided between the 312 and the second electrode 332 may emit light L1 of the first color.

That is, in both the first sub-pixel P1 and the second sub-pixel P2, light L1 of the same first color may emit light from the first emission layers 321 and 322. The display device according to the exemplary embodiment of the present invention may further include a color filter to emit light of different colors from the first sub-pixel P1 and the second sub-pixel P2.

The color filter may include a first color filter CF1 disposed to correspond to the first sub-pixel P1 and a second color filter CF2 disposed to correspond to the second sub-pixel P2. The first color filter CF1 and the second color filter CF2 may transmit light of different colors.

For example, the first emission layers 321, 322, and 323 may be yellow emission layers that emit yellow light. The first color filter CF1 may be a red color filter that transmits red light, and the second color filter CF2 may be a green color filter that transmits green light. Accordingly, the first sub-pixel P1 may emit red light L3 and the second sub-pixel P2 may emit green light L4.

The first and second color filters CF1 and CF2 may be disposed under the first electrodes 311 and 312 or on the third electrodes 351 and 352 according to the light emission method of the display device 100. When the display device 100 is a bottom emission type, the first and second color filters CF1 and CF2 may be provided under the first electrodes 311 and 312. When the display device 100 is a top emission type, the first and second color filters CF1 and CF2 may be provided on the third electrodes 351 and 352.

In the third sub-pixel P3, only the second emission layer 323 of the first emission layer 323 and the second emission layer 343 emit light. Since the first electrode 310 is not formed in the third sub-pixel P3, the first emission layer 323 does not emit light.

Meanwhile, in the third sub-pixel P3, the second electrode 333 is connected to the second connection electrode 242 to receive a third high potential voltage. When a low potential voltage is applied to the third electrode 353, the second emission layer 343 provided between the second electrode 333 and the third electrode 353 can emit light L2 of the second color. have.

For example, the third sub-pixel P3 may be a blue emission layer emitting blue light. In this case, the display device 100 may implement a blue sub-pixel without a separate color filter at a position corresponding to the third sub-pixel P3.

As described above, in the display device 100 according to an exemplary embodiment of the present invention, only the first emission layers 321 and 322 emit light in the first sub-pixel P1 and the second sub-pixel P2, and Only the second emission layer 343 may emit light in the pixel P3. Accordingly, the display device 100 according to the exemplary embodiment of the present invention has power compared to emitting all of the first emission layers 321, 322, 323 and the second emission layers 341, 342, 343 in all sub-pixels. Consumption can be significantly reduced.

In addition, the display device 100 according to an exemplary embodiment masks the first emission layers 321, 322, 323 and the second emission layers 341, 342, 343 on the sub-pixels P1, P2, and P3. Forms on the front without. Accordingly, the display device 100 according to an exemplary embodiment of the present invention can solve a problem in that different light emitting layers are patterned for each of the sub-pixels P1, P2, and P3 using a mask.

In addition, the display device 100 according to the exemplary embodiment does not form the first electrode 310 in the third sub-pixel P3. Accordingly, the display device 100 according to the exemplary embodiment may improve transmittance in the third sub-pixel P3. In particular, when the display device 100 is formed in a bottom emission type, since the light emitted from the second emission layer 340 does not have to pass through the first electrodes 311 and 312, the light is It can minimize loss and maximize light efficiency.

In addition, the display device 100 according to the exemplary embodiment may have a larger emission area EA3 than the first sub-pixel P1 and the second sub-pixel P2 in the third sub-pixel P3. . That is, the third sub-pixel P3 may have a larger emission area and an aperture ratio than the first sub-pixel P1 and the second sub-pixel P2.

14 is a plan view schematically illustrating a first substrate according to another embodiment of the present invention, and FIG. 15 is a cross-sectional view illustrating an example of VI-VI of FIG. 14.

14 and 15, a display panel 110 according to another exemplary embodiment of the present invention includes a first sub-pixel P1, a second sub-pixel P2, a third sub-pixel P3, and a fourth sub-pixel. The pixel P4 may be provided.

The display panel 110 according to another exemplary embodiment of the present invention further includes a fourth sub-pixel P4 compared to the display panel 110 according to the exemplary embodiment illustrated in FIGS. 3 to 13. There is a difference in that. Hereinafter, such differences will be mainly described, and overlapping content will be omitted.

The first sub-pixel P1 emits red light, the second sub-pixel P2 emits green light, the third sub-pixel P3 emits blue light, and the fourth sub-pixel P4 is It may be provided to emit white light or yellow light, but is not limited thereto. In addition, the arrangement order of each of the sub-pixels P1, P2, and P3 may be variously changed.

Hereinafter, for convenience of description, the first sub-pixel P1 emits red light, the second sub-pixel P2 emits green light, and the third sub-pixel P3 emits blue light, The description will be made on the assumption that the fourth sub-pixel P4 emits yellow light.

The display panel 110 according to another exemplary embodiment of the present invention includes a first emission layer on each of the first sub-pixel P1, the second sub-pixel P2, the third sub-pixel P3, and the fourth sub-pixel P4. 320 and a second emission layer 340 are provided. In the display panel 110 according to another exemplary embodiment, each of the first sub-pixel P1, the second sub-pixel P2, the third sub-pixel P3, and the fourth sub-pixel P4 is a first emission layer. It is characterized in that only one of the light emitting layer 320 and the second light emitting layer 340 emit light.

Specifically, in the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4, only the first emission layer 320 of the first emission layer 320 and the second emission layer 340 emit light. I can. Meanwhile, in the third sub-pixel P3, only the second emission layer 340 of the first emission layer 320 and the second emission layer 340 may emit light. In this case, if the second emission layer 340 emits blue light, the third sub-pixel P3 may be a blue sub-pixel that emits blue light. Meanwhile, the first emission layer 320 may emit yellow light. In such a case, the first sub-pixel P1 may become a red sub-pixel that emits red light by arranging a red color filter in a path through which light is emitted. The second sub-pixel P2 may become a green sub-pixel that emits green light by arranging a green color filter in a path through which light is emitted. The fourth sub-pixel P4 may be a yellow sub-pixel that emits yellow light.

Meanwhile, in the display panel 110 according to another exemplary embodiment of the present invention, a first electrode 310 and a second electrode 310 are provided in each of the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4. An electrode 330 and a third electrode 350 are provided. The display panel 110 according to another exemplary embodiment of the present invention includes a second electrode 330 and a third electrode provided in each of the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4. The electrode 350 is electrically connected. Accordingly, the display panel 110 according to another exemplary embodiment of the present invention includes the first emission layer 320 and the second light emitting layer 320 in the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4. Of the emission layers 340, only the first emission layer 320 may emit light.

The display panel 110 according to another exemplary embodiment of the present invention includes a second electrode 330 and a third electrode provided in each of the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4. In order to electrically connect the electrode 350, a first undercut structure region UCA1 is formed on at least one side of each of the first sub-pixel P1 and the second sub-pixel P2 as illustrated in FIG. 14.

Each of the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4 has a first emission layer 320 and a second light emitting layer 320 in the first undercut structure region UCA1 as shown in FIG. 15. The electrode 330, the second emission layer 340 and the third electrode 350 are disconnected.

In addition, each of the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4 includes the second electrode 330 and the third electrode 350 in the first undercut structure area UCA1. Connect. Since the first undercut structure area UCA1 is substantially the same as the first undercut structure area UCA1 shown in FIGS. 3 to 12, a description thereof will be omitted.

The same first voltage is applied to the second electrode 330 and the third electrode 350 provided in each of the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4. Accordingly, each of the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4 has a second emission layer 340 provided between the second electrode 330 and the third electrode 350. ) Does not emit light, and only the first emission layer 320 provided between the first electrode 310 and the second electrode 330 emit light.

Meanwhile, in the display panel 110 according to another exemplary embodiment of the present invention, the second electrode 330 and the third electrode 350 are provided in the third sub-pixel P3. In the display panel 110 according to another exemplary embodiment of the present invention, the first electrode 310 is not disposed on the third sub-pixel P3. Accordingly, in the third sub-pixel P3, the first emission layer 320 provided between the second electrode 330 and the substrate 111 does not emit light.

In the display panel 110 according to another exemplary embodiment of the present invention, unlike the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4, the display panel 110 is provided in the third sub-pixel P3. The second electrode 330 and the third electrode 350 are not electrically connected. That is, different voltages are applied to the second electrode 330 and the third electrode 350 provided in the third sub-pixel P3.

In the display panel 110 according to another exemplary embodiment of the present invention, as illustrated in FIG. 14, the second undercut structure region UCA2 is formed to surround the third sub-pixel P3. In the third sub-pixel P3, as shown in FIG. 15, the first emission layer 320 and the second electrode 330 are disconnected in the second undercut structure area UCA2, and the second emission layer 340 and the third The electrode 350 is connected. Since the second undercut structure area UCA2 is substantially the same as the second undercut structure area UCA2 shown in FIGS. 3 to 12, a description thereof will be omitted.

In the third sub-pixel P3, the second electrode 330 and the third electrode 350 are disposed to be spaced apart from each other with the second emission layer 340 interposed therebetween. The third electrode 350 of the third sub-pixel P3 is connected to the third electrode 350 of the adjacent sub-pixels P1 and P2, so that the same first voltage may be applied thereto. Meanwhile, a second voltage different from the first voltage may be applied to the second electrode 330 of the third sub-pixel P3. Accordingly, in the third sub-pixel P3, the second emission layer 340 provided between the second electrode 330 and the third electrode 350 emit light.

16 is a diagram illustrating light emitted from each of first to fourth sub-pixels.

Referring to FIG. 16, in the display device 100 according to another exemplary embodiment of the present invention, in each of the sub-pixels P1, P2, P3, and P4, first emission layers 321, 322, 323, and 325 and a second emission layer ( Only one of 341, 342, 343, 345) can emit light.

More specifically, in the first sub-pixel P1, only the first emission layer 321 of the first emission layer 321 and the second emission layer 341 may emit light. In the first sub-pixel P1, the second electrode 331 and the third electrode 351 may be electrically connected in the first undercut structure area UCA1. The first sub-pixel P1 may apply the same voltage to the second electrode 331 and the third electrode 351 through the auxiliary power line 360. Accordingly, in the first sub-pixel P1, the second emission layer 341 provided between the second electrode 331 and the third electrode 351 does not emit light.

Meanwhile, in the first sub-pixel P1, when a first high potential voltage is applied to the first electrode 311 and a low potential voltage is applied to the second electrode 331 and the third electrode 351, the first electrode The first emission layer 321 provided between the 311 and the second electrode 331 may emit light L1 of the first color.

The second sub-pixel P2 may emit light only from the first emission layer 322 of the first emission layer 322 and the second emission layer 342. In the second sub-pixel P2, the second electrode 332 and the third electrode 352 may be electrically connected in the first undercut structure area UCA1. The second sub-pixel P2 may apply the same voltage to the second electrode 332 and the third electrode 352 through the auxiliary power line 360. Accordingly, in the second sub-pixel P2, the second emission layer 342 provided between the second electrode 332 and the third electrode 352 does not emit light.

Meanwhile, in the second sub-pixel P2, when a second high potential voltage is applied to the first electrode 312 and a low potential voltage is applied to the second electrode 332 and the third electrode 352, the first electrode The first emission layer 322 provided between the 312 and the second electrode 332 may emit light L1 of the first color.

In the fourth sub-pixel P4, only the first emission layer 325 of the first emission layer 325 and the second emission layer 345 may emit light. In the fourth sub-pixel P4, the second electrode 335 and the third electrode 355 may be electrically connected in the first undercut structure area UCA1. In the fourth sub-pixel P4, the same voltage may be applied to the second electrode 335 and the third electrode 355 through the auxiliary power line 360. Accordingly, in the fourth sub-pixel P4, the second emission layer 345 provided between the second electrode 335 and the third electrode 355 does not emit light.

Meanwhile, in the fourth sub-pixel P4, when a third high potential voltage is applied to the first electrode 315 and a low potential voltage is applied to the second electrode 335 and the third electrode 355, the first electrode The first emission layer 325 provided between the 315 and the second electrode 335 may emit light L1 of the first color.

That is, in the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4, the light L1 of the same first color is emitted from the first emission layers 321, 322, and 325. I can. The display device according to another exemplary embodiment of the present invention further includes a color filter to emit light of different colors from the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4. Can be.

The color filter may include a first color filter CF1 disposed to correspond to the first sub-pixel P1 and a second color filter CF2 disposed to correspond to the second sub-pixel P2. The first color filter CF1 and the second color filter CF2 may transmit light of different colors.

For example, the first emission layers 321, 322, 323, and 325 may be yellow emission layers that emit yellow light. The first color filter CF1 may be a red color filter that transmits red light, and the second color filter CF2 may be a green color filter that transmits green light.

Accordingly, the first sub-pixel P1 may emit red light L3 and the second sub-pixel P2 may emit green light L4.

Meanwhile, the display device 100 may implement a yellow sub-pixel that emits yellow light L1 without providing a separate color filter at a position corresponding to the fourth sub-pixel P4.

The first and second color filters CF1 and CF2 may be disposed under the first electrodes 311 and 312 or on the third electrodes 351 and 352 according to the light emission method of the display device 100. When the display device 100 is a bottom emission type, the first and second color filters CF1 and CF2 may be provided under the first electrodes 311 and 312. When the display device 100 is a top emission type, the first and second color filters CF1 and CF2 may be provided on the third electrodes 351 and 352.

In the third sub-pixel P3, only the second emission layer 323 of the first emission layer 323 and the second emission layer 343 emit light. Since the first electrode 310 is not formed in the third sub-pixel P3, the first emission layer 323 does not emit light.

Meanwhile, in the third sub-pixel P3, the second electrode 333 is connected to the second connection electrode 242 to receive a third high potential voltage. When a low potential voltage is applied to the third electrode 353, the second emission layer 343 provided between the second electrode 333 and the third electrode 353 can emit light L2 of the second color. have.

For example, the third sub-pixel P3 may be a blue emission layer emitting blue light. In this case, the display device 100 may implement a blue sub-pixel without a separate color filter at a position corresponding to the third sub-pixel P3.

As described above, in the display device 100 according to another exemplary embodiment of the present invention, the first emission layers 321 and 322 are formed in the first sub-pixel P1, the second sub-pixel P2, and the fourth sub-pixel P4. , 325 may be emitted, and only the second emission layer 343 may be emitted from the third sub-pixel P3. Accordingly, the display device 100 according to another exemplary embodiment of the present invention emits light in all of the first emission layers 321, 322, 323, and 325 and the second emission layers 341, 342, 343, and 345 in all sub-pixels. Compared to that, power consumption can be significantly reduced.

In addition, in the display device 100 according to another exemplary embodiment of the present invention, the first emission layers 321, 322, 323 and 325 and the second emission layers 341 and 342 are provided in the sub-pixels P1, P2, P3, and P4. 343, 345) are formed on the entire surface without a mask. Accordingly, the display device 100 according to another exemplary embodiment of the present invention may solve a problem of patterning different light emitting layers for each of the sub-pixels P1, P2, P3, and P4 using a mask.

In addition, in the display device 100 according to another exemplary embodiment of the present invention, the first electrode 310 is not formed in the third sub-pixel P3. Accordingly, the display device 100 according to another exemplary embodiment of the present invention may improve transmittance in the third sub-pixel P3. In particular, when the display device 100 is formed in a bottom emission type, since the light emitted from the second emission layer 340 does not have to pass through the first electrodes 311 and 312, the light is It can minimize loss and maximize light efficiency.

Also, the display device 100 according to another exemplary embodiment of the present invention may implement a blue sub-pixel and a yellow sub-pixel without using a color filter. Accordingly, light loss occurring while passing through the color filter can be prevented, and light emission luminance can be improved.

In addition, the display device 100 according to another exemplary embodiment of the present invention may have a larger emission area EA3 than the first sub-pixel P1 and the second sub-pixel P2 in the third sub-pixel P3. . That is, the third sub-pixel P3 may have a larger emission area and an aperture ratio than the first sub-pixel P1 and the second sub-pixel P2.

17A to 17C relate to a display device according to another embodiment of the present invention, which relates to a head mounted display (HMD) device. 17A is a schematic perspective view, FIG. 17B is a schematic plan view of a virtual reality (VR) structure, and FIG. 17C is a schematic cross-sectional view of an Augmented Reality (AR) structure.

As can be seen from FIG. 17A, the head mounted display device according to the present invention includes a storage case 10 and a head mounting band 30.

The storage case 10 houses components such as a display device, a lens array, and an eyepiece therein.

The head mounting band 30 is fixed to the storage case 10. The head mounting band 30 is illustrated to be formed to surround the upper surface of the user's head and both sides, but is not limited thereto. The head mounting band 30 is for fixing the head-mounted display to the user's head, and may be replaced with a structure in the form of a spectacle frame or a helmet form.

As can be seen from FIG. 17B, the head-mounted display device having a virtual reality (VR) structure according to the present invention includes a left-eye display device 12, a right-eye display device 11, a lens array 13, and a left-eye eyepiece. 20a) and a right eye eyepiece 20b.

The left-eye display device 12, the right-eye display device 11, the lens array 13, and the left-eye eyepiece 20a and the right-eye eyepiece 20b are accommodated in the storage case 10 described above.

The left-eye display device 12 and the right-eye display device 11 may display the same image, and in this case, the user may view the 2D image. Alternatively, the left-eye display device 12 may display a left-eye image and the right-eye display device 11 may display a right-eye image. In this case, the user can view a stereoscopic image. Each of the left-eye display device 12 and the right-eye display device 11 may include a display panel according to FIGS. 1 to 15 described above. In this case, an upper portion corresponding to a surface on which an image is displayed in FIGS. 1 to 15, for example, color filters CF1, CF2, and CF3 face the lens array 13.

The lens array 13 may be provided between the left-eye eyepiece 20a and the left-eye display device 12 while being spaced apart from each of the left-eye eyepiece 20a and the left-eye display device 12. That is, the lens array 13 may be positioned in front of the left eye eyepiece 20a and behind the left eye display device 12. In addition, the lens array 13 may be provided between the right eye eye lens 20b and the right eye display device 11 while being spaced apart from each of the right eye eye lens 20b and the right eye display device 11. That is, the lens array 13 may be located in front of the right eye eyepiece 20b and behind the right eye display device 11.

The lens array 13 may be a micro lens array. The lens array 13 may be replaced with a pin hole array. An image displayed on the left-eye display device 12 or the right-eye display device 11 due to the lens array 13 may be enlarged and viewed by the user.

The user's left eye LE may be positioned on the left eyepiece 20a, and the user's right eye RE may be positioned on the right eyepiece 20b.

As can be seen from FIG. 17C, the head mounted display device having an Augmented Reality (AR) structure according to the present invention includes a left-eye display device 12, a lens array 13, a left eye eyepiece 20a, and a transmission reflector 14. , And a transmission window 15. In FIG. 17C, for convenience, only the left-inside configuration is shown, and the right-inside configuration is also the same as the left-inside configuration.

The left-eye display device 12, the lens array 13, the left-eye eyepiece 20a, the transmission reflection portion 14, and the transmission window 15 are accommodated in the storage case 10 described above.

The left eye display device 12 may be disposed on one side of the transmission reflective unit 14, for example, on the upper side, without covering the transmission window 15. Accordingly, the left-eye display device 12 may provide an image to the transmissive reflector 14 without covering an external background visible through the transmissive window 15.

The left eye display device 12 may include the display panel according to FIGS. 1 to 15 described above. At this time, an upper portion corresponding to a surface on which an image is displayed in FIGS. 1 to 15, for example, color filters CF1, CF2, and CF3 face the transmission reflector 14.

The lens array 13 may be provided between the left eye eyepiece 20a and the transmission reflector 14.

The user's left eye is located in the left eye eyepiece 20a.

The transmission reflection part 14 is disposed between the lens array 13 and the transmission window 15. The transmission reflection part 14 may include a reflective surface 14a that transmits a part of light and reflects another part of the light. The reflective surface 14a is formed so that the image displayed on the left eye display device 12 proceeds to the lens array 13. Accordingly, the user can see both an external background and an image displayed by the left eye display device 12 through the transmission layer 15. That is, since the user can view the real background and the virtual image as a single image, an augmented reality (AR) can be implemented.

The transmissive layer 15 is disposed in front of the transmissive reflective portion 14.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made without departing from the spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and are not limiting. The scope of protection of the present invention should be interpreted by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: display device 110: display panel
111: first substrate 112: second substrate
140: source drive IC 150: flexible film
160: circuit board 170: timing control unit
210: light shielding layer 220: first insulating film
230: thin film transistor 241: first connection electrode
242: second connection electrode 260: second insulating layer
270: third insulating layer 310: first electrode
320: first emission layer 330: second electrode
340: second emission layer 350: third electrode

Claims (18)

A substrate including a first sub-pixel and a second sub-pixel;
A first emission layer provided on the substrate to emit light of a first color;
A second emission layer provided on the first emission layer to emit light of a second color;
A first electrode provided between the substrate and the first emission layer;
A second electrode provided between the first emission layer and the second emission layer;
A third electrode provided on the second emission layer;
A first undercut structure region disposed on at least one side of the first sub-pixel and in which a first lower layer having a first undercut structure and a first upper layer are disposed; And
And a second undercut structure region surrounding the second sub-pixel and in which a second lower layer having a second undercut structure and a second upper layer are disposed,
The second electrode and the third electrode provided in the first sub-pixel are connected in the first undercut structure region,
A display device in which a second emission layer and a third electrode provided in the second sub-pixel are connected in the second undercut structure area. The method of claim 1,
The first sub-pixel emits only the first emission layer of the first emission layer and the second emission layer,
The second sub-pixel emits only the second emission layer of the first emission layer and the second emission layer. The method of claim 1,
A display device in which a first emission layer, a second electrode, a second emission layer, and a third electrode provided in the first sub-pixel are disconnected by the first undercut structure. The method of claim 1,
The first electrode is provided only in the first sub-pixel among the first sub-pixel and the second sub-pixel. The method of claim 1,
The first upper layer is made of the same material as the first electrode provided in the first sub-pixel, and is disposed to be spaced apart from the first electrode. The method of claim 5,
The second electrode and the third electrode provided in the first sub-pixel are electrically connected to the first upper layer of the first undercut structure. The method of claim 1,
Further comprising a first connection electrode provided between the substrate and the first lower layer,
The first upper layer is electrically connected to the first connection electrode through a contact hole penetrating the first lower layer. The method of claim 7,
The first lower layer includes a first opening region exposing a portion of the first connection electrode, and the first upper layer covers a first overlapping portion overlapping the first lower layer and a part of the first opening region. Including a protruding first protrusion,
At least one of the second electrode and the third electrode contacts the exposed first connection electrode. The method of claim 7,
A display device to which a second electrode and a third electrode provided in the first sub-pixel, a first upper layer of the first undercut structure, and the first connection electrode are electrically connected. The method of claim 1,
In the second sub-pixel, the first emission layer and the second electrode are disconnected by the second undercut structure. The method of claim 1,
A second electrode provided in the second sub-pixel is not electrically connected to a second electrode provided in the first sub-pixel, and a third electrode provided in the second sub-pixel is provided in the first sub-pixel. A display device electrically connected to the third electrode. The method of claim 1,
Further comprising a second connection electrode provided between the substrate and the second lower layer,
The second lower layer includes a second opening region exposing a portion of the second connection electrode, and the second upper layer covers a second overlapping portion overlapping the second lower layer and a part of the second opening region. Including a protruding second protrusion,
A display device in which a second electrode provided in the second sub-pixel contacts the exposed second connection electrode. A first sub-pixel comprising a first electrode, a first emission layer, a second electrode, a second emission layer, and a third electrode;
A second sub-pixel comprising the first emission layer, the second electrode, the second emission layer, and the third electrode;
A first undercut structure provided on at least one side of the first sub-pixel and including a first lower layer and a first upper layer provided on the first lower layer; And
A second undercut structure provided to surround the second sub-pixel and including a second lower layer and a second upper layer provided on the second lower layer,
A display device in which a first lower layer of the first undercut structure has a higher height than a second lower layer of the second undercut structure. The method of claim 13,
The second electrode and the third electrode provided in the first sub-pixel are disconnected by the first undercut structure and are connected to each other in a first undercut structure region in which the first undercut structure is disposed,
The second electrode provided in the second sub-pixel is disconnected by the second undercut structure, and the third electrode provided in the second sub-pixel is connected in a second undercut structure region provided with the second undercut structure. Display device. The method of claim 14,
In the first sub-pixel, the first emission layer provided between the first electrode and the second electrode emit light,
In the second sub-pixel, the second emission layer provided between the second electrode and the third electrode emits light. The method of claim 13,
The number of layers constituting the first lower layer of the first undercut structure is greater than the number of layers constituting the second lower layer of the second undercut structure. The method of claim 13,
A display device wherein the first upper layer of the first undercut structure and the second upper layer of the second undercut structure are made of different materials. The method of claim 13,
The first upper layer of the first undercut structure is made of a conductive material, and the second upper layer of the second undercut structure is made of a non-conductive material.

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