KR20210085263A - Display device - Google Patents

Abstract

A display device according to one embodiment of the present invention includes: a first display panel in which a plurality of first pixels each including a light emitting unit and a transmissive unit and which is composed of a transparent display; and a second display panel in which a plurality of second pixels including the light emitting unit are disposed and which is disposed under the first display panel to overlap a portion of the first display panel. Accordingly, it is possible to provide the display device capable of improving the resolution in the same area.

Description

display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a display device capable of high resolution and large size.

Display devices used in computer monitors, TVs, and mobile phones include organic light emitting displays (OLEDs) that emit light by themselves, and liquid crystal displays (LCDs) that require a separate light source. have.

A display device is being applied to a personal portable device as well as a computer monitor and TV, and research on a display device having a large display area and reduced volume and weight is being conducted.

Meanwhile, recently, a tiling display device having a larger display area by connecting a plurality of display devices is attached to a wall or the like and used as an advertisement board.

First, the display device is used from a small-sized electronic device used in a mobile phone or the like to a large-sized electronic device such as a large-sized TV. As such, display devices have been manufactured from small sizes to large sizes of several tens of inches and are being used for various purposes. However, it is technically difficult to manufacture a display device having a size of several hundred inches or more. Instead, a tiling display device having a larger display area by connecting a plurality of display devices is used. In addition, a tiling display device composed of a plurality of display devices is attached to a wall and used as an advertisement board, or is used as a large electronic billboard in a stadium or an outdoor advertisement billboard.

As described above, a plurality of pixels may be disposed on each of the plurality of display panels constituting the tiling display device. Also, by overlapping regions in which the plurality of pixels are not disposed in the plurality of display panels, the resolution may be increased while maintaining the bezel length.

However, the inventors of the present invention have recognized a problem in that there is a limitation in increasing the resolution of a display device having a structure in which only bezels are overlapped in a plurality of display panels. Also, when a plurality of display panels are tiled on the same plane, a plurality of pixels disposed on each of the plurality of display panels are also disposed on the same plane, so that the resolution of the display device increases only in a single direction.

Accordingly, the inventors of the present invention have configured a display panel positioned on an upper portion of a plurality of display panels as a transparent display, overlapped the display panels with each other to increase the resolution in the same area, and at the same time increase the resolution in the X-axis and Y-axis. A display device that can be increased in both the axial direction has been invented.

Accordingly, an object of the present invention is to provide a display device having improved resolution in the same area.

Another object of the present invention is to provide a display device in which resolution is improved in multiple directions.

Another object of the present invention is to provide a display device capable of reducing a decrease in visibility in a region where display panels overlap.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In a display device according to an embodiment of the present invention, a plurality of first pixels each including a light emitting part and a transmissive part are disposed, a first display panel made of a transparent display, and a plurality of second pixels including a light emitting part are disposed, , a second display panel disposed under the first display panel to partially overlap the first display panel, and the light emitting portion of the plurality of second pixels may be disposed to overlap with the transmitting portion of the plurality of first pixels.

A display device according to another embodiment of the present invention provides a first display panel in which a plurality of first pixels including a light emitting part and a transmissive part are disposed, and a plurality of second display panels including a light emitting part overlapping the transmissive part of the plurality of first pixels. It may include a second display panel in which pixels are disposed, and the light emitting units of the plurality of first pixels and the light emitting units of the plurality of second pixels may be alternately arranged.

The details of other embodiments are included in the detailed description and drawings.

According to the present invention, the resolution in the same area can be improved by configuring the display panel disposed thereon as a transparent display and overlapping the display panels.

According to the present invention, pixels arranged on each display panel are alternately arranged to improve resolution in multiple directions.

According to the present invention, by arranging a portion of the sub-pixels to be spaced apart from each other, it is possible to reduce a decrease in visibility in an area where the display panel overlaps.

The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present invention.

1 is a plan view of a display device according to an exemplary embodiment.
2 is an exploded perspective view of a display device according to an exemplary embodiment.
FIG. 3 is a cross-sectional view taken along line V-V' of FIG. 1 .
4A is a plan view of a plurality of first pixels of a display device according to an exemplary embodiment.
4B is a plan view of a plurality of second pixels of a display device according to an exemplary embodiment.
5 is a cross-sectional view taken along line IV-IV' of FIGS. 3A and 3B.
FIG. 6 is an enlarged view of area A of FIG. 1 .
FIG. 7 is an enlarged view of area B of FIG. 1 .

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction 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 shapes, only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, areas, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative and the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When 'include', 'have', 'consists of', etc. mentioned in the present invention are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

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

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between the two parts unless 'directly' is used.

Reference to a device or layer “on” another device or layer includes any intervening layer or other device directly on or in the middle of another device.

Also, although the first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present invention.

Like reference numerals refer to like elements throughout.

The area and thickness of each component shown in the drawings are shown for convenience of description, and the present invention is not necessarily limited to the area and thickness of the illustrated component.

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

Hereinafter, the present invention will be described with reference to the drawings.

1 is a plan view of a display device according to an exemplary embodiment. 2 is an exploded perspective view of a display device according to an exemplary embodiment. 3 is a cross-sectional view taken along line V-V' of FIG. 1 . 4A is a plan view of a plurality of first pixels of a display device according to an exemplary embodiment. 4B is a plan view of a plurality of second pixels of a display device according to an exemplary embodiment.

1 to 3 , the display device 100 includes a first display panel 110 , a second display panel 120 , a first adhesive member 171 , a second adhesive member 172 , and a wire part ( 190 ) and a connection substrate 180 .

The display device 100 may be a tiling display device. That is, the display device 100 may manufacture a high-resolution and large-sized display by attaching a plurality of display panels to each other. In detail, the display device 100 displays the first display panel such that light emitted from the second display panel 120 disposed under the first display panel 110, which will be described later, is displayed through the first display panel 110 . By arranging 110 and the second display panel 120 to overlap each other, the display device 100 having a high resolution can be realized while maintaining the bezel length of the display panels 110 and 120 .

The first display panel 110 is disposed on the display device 100 . The first display panel 110 is made of a transparent display, so that the second display panel 120 disposed under the first display panel 110 can be visually recognized.

The first display panel 110 includes a substrate 111 . The substrate 111 of the first display panel 110 may be formed of a transparent material as the transparent display of the first display panel 110 is formed. For example, the substrate 111 of the first display panel 110 may be made of glass, polyimide, a transparent plastic material, or the like, but is not limited thereto.

The second display panel 120 is disposed under the first display panel 110 . The second display panel 120 may be disposed to partially overlap the first display panel 110 . For example, a portion of the second display panel 120 may be disposed under a portion of the first display panel 110 . The size of the second display panel 120 may be the same as that of the first display panel 110 , but is not limited thereto. Also, the second display panel 120 may be formed of an opaque display, but is not limited thereto, and the second display panel 120 may be formed of a transparent display in the same manner as the first display panel 110 .

The second display panel 120 includes a substrate 121 . The substrate 121 of the second display panel 120 may be formed of an opaque material as the second display panel 120 is formed of an opaque display. For example, the substrate 121 of the second display panel 120 may include an elastic polymer such as silicone rubber such as polydimethylsiloxane (PDMS), polyurethane (PU), or polytetrafluoroethylene (PTFE). (elastomer) or may be made of a plastic material having flexibility (flexibility), but is not limited thereto. Also, when the second display panel 120 is formed of a transparent display, the substrate 121 of the second display panel 120 may be formed of the same material as the substrate 121 of the first display panel 110 .

A first adhesive member 171 is disposed between the first display panel 110 and the second display panel 120 . The first adhesive member 171 may adhere the first display panel 110 and the second display panel 120 to each other. The first adhesive member 171 may be made of a material having substantially the same refractive index as the substrate of the first display panel 110 . For example, the first adhesive member 171 may include an epoxy resin, a gel-type polymer resin such as Canada balsam, or a fluid-type adhesive material such as silicone fluid. may be made, but is not limited thereto.

The first adhesive member 171 may be made of a material having the same refractive index as that of the substrate 111 of the first display panel 110 . Accordingly, the first adhesive member 171 may reduce the refracting of light emitted from the second display panel 120 at the interface between the first adhesive member 171 and the first display panel 110 .

A connection substrate 180 is disposed under the second display panel 120 . The connection substrate 180 is disposed on a surface opposite to one surface of the second display panel 120 on which the first display panel 110 is disposed, so that the first display panel 110 and the second display panel 120 are protected from external impact. ) can be protected. The connection substrate 180 may be made of the same material as the substrate 111 of the first display panel 110 or the substrate 121 of the second display panel 120 , but is not limited thereto.

A second adhesive member 172 is disposed between the second display panel 120 and the connection substrate 180 . The second adhesive member 172 fixes the connection substrate 180 to the rear surface of the second display panel 120 , so that the connection substrate 180 is tiled on the first display panel 110 and the second display panel 120 . ) can be supported. The second adhesive member 172 may be made of the same material as the first adhesive member 171 , but is not limited thereto.

A printed circuit board P is disposed on the rear surface of the second display panel 120 . The printed circuit board P may be disposed on a surface opposite to one surface of the second display panel 120 on which the first display panel 110 is disposed, and may be connected to the wire unit 190 . Specifically, the printed circuit board P is connected to the wire unit 190 connected to the first display panel 110 and the second display panel 120 , and the first display panel 110 and the second display panel 120 are connected to each other. ) can supply various control signals to each driving element.

A wire part 190 is disposed at an end of the first display panel 110 . The wire part 190 is connected to the printed circuit board P and includes a plurality of first pixels PX1 disposed on the first display panel 110 and a plurality of second pixels disposed on the second display panel 120 . A driving signal can be transmitted to (PX2). The wire part 190 may be formed through a stamping process after disposing the end of the first display panel 110 and the end of the second display panel 120 adjacent to each other, but is not limited thereto. In addition, the wire part 190 may be made of silver paste (Ag paste), but is not limited thereto.

The wire part 190 may extend from an end of the first display panel 110 and may be disposed in the non-emission part NEA of the second display panel 120 . For example, when the wire part 190 extending from the end of the first display panel 110 is disposed on the light emitting part EA2 of the plurality of second pixels PX2 of the second display panel 120 , a plurality of In addition to causing interference to light emitted from the second pixel PX2 of the display device 100 , the wire unit 190 may be visually recognized from the front surface of the display device 100 . Accordingly, it is possible to reduce interference of light emitted from the light-emitting units EA2 of the plurality of second pixels PX2 by making the wire unit 190 disposed on the non-emission portion NEA of the second display panel 120 . can

The wire part 190 may extend from the non-emission part NEA of the second display panel 120 to the rear surface of the second display panel 120 . For example, the wire part 190 may extend from the non-emission part NEA of the second display panel 120 to surround the end of the second display panel 120 . That is, the wire part 190 may be disposed on a portion of the upper surface, a side surface, and a portion of the lower surface of the end of the second display panel 120 , and may be connected to the printed circuit board P on the rear surface of the second display panel 120 . have.

1 to 4B , a plurality of first pixels PX1 are disposed on the first display panel 110 , and a plurality of second pixels PX2 are disposed on the second display panel 120 . The plurality of first pixels PX1 may include a light emitting unit EA1 , a transmission unit TA, and a driving unit CA1 , and the plurality of second pixels PX2 may include a light emitting unit EA2 and a driving unit CA2 . can

The light emitting units EA1 and EA2 may be regions in which an actual image is realized by emitting light. Accordingly, a plurality of sub-pixels SP may be disposed in the light emitting units EA1 and EA2 . The plurality of sub-pixels SP may include, but is not limited to, a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. 4A and 4B , it is illustrated that the plurality of sub-pixels SP are disposed in a 2X2 array, but the present invention is not limited thereto, and the plurality of sub-pixels SP may be disposed on the light emitting units EA1 and EA2 in a stripe shape. have.

The light emitting units EA1 and EA2 may be disposed on the upper left side in the plurality of first pixels PX1 and the plurality of second pixels PX2 .

Drivers CA1 and CA2 may be disposed below the light emitting units EA1 and EA2 of the plurality of first pixels PX1 and the plurality of second pixels PX2 . Various driving devices such as transistors, capacitors, and wires for driving the light emitting device 130 may be disposed in the driving units CA1 and CA2 . In this case, the driving element may include a switching transistor, a driving transistor, and the like. The driving element may be electrically connected to a signal line such as a gate line or a data line connected to a gate driver and a data driver disposed in the non-display area.

Referring to FIG. 4A , the plurality of first pixels PX1 includes the transmission part TA unlike the plurality of second pixels PX2 . The transmitting portion TA may be a region through which at least a portion of light incident from the second display panel 120 disposed under the first display panel 110 is transmitted. However, when the plurality of second pixels PX2 are formed of a transparent display, the plurality of second pixels PX2 may also include a transmissive part.

The transmitting portion TA of the plurality of first pixels PX1 may be disposed on the right side of the light emitting portion EA1 in the plurality of first pixels PX1 . However, the present invention is not limited thereto, and when the transmitting part TA is disposed on the left side of the first pixel PX1 , the light emitting part EA may be disposed on the right side of the first pixel PX1 .

Again, referring to FIGS. 1 to 3 , the light emitting part EA2 of the plurality of second pixels PX2 may be disposed to overlap the transmission part TA of the plurality of first pixels PX1 . Since the second display panel 120 on which the plurality of second pixels PX2 are disposed is disposed under the first display panel 110 , the light emitted from the light emitting part EA2 of the plurality of second pixels PX2 is disposed. In order to transmit through the entire surface of the display device 100 , the light emitting portion EA2 of the plurality of second pixels PX2 should be disposed to overlap the transmitting portion TA of the plurality of first pixels PX1 .

The area of the transmission part TA in the plurality of first pixels PX1 may be greater than or equal to the area of the emission part EA2 of the plurality of second pixels PX2 . For example, light emitted from the light emitting part EA2 of the plurality of second pixels PX2 may be transmitted through the transmitting part TA of the plurality of first pixels PX1 . In this case, when the area of the light emitting part EA2 of the plurality of second pixels PX2 is larger than the area of the transmission part TA of the plurality of first pixels PX1 , the light emitting part EA2 of the plurality of second pixels PX2 is An amount of light transmitted through the transmission portion TA of the plurality of first pixels PX1 among the light emitted from EA2 may decrease. Accordingly, the area of the transmission part TA of the plurality of first pixels PX1 is greater than or equal to the area of the light emitting part EA2 of the plurality of second pixels PX2 , so that The amount of light transmitted through the transmission portion TA of the plurality of first pixels PX1 among the emitted light may be increased.

The light emitting part EA2 of the plurality of second pixels PX2 is disposed on a lower side of the area overlapping the transmission part TA of the plurality of first pixels PX1 . That is, the light emitting part EA2 of the plurality of second pixels PX2 may be disposed to alternate with the light emitting part EA1 of the plurality of first pixels PX1 , and may be disposed to have a substantially zigzag pattern.

Meanwhile, the thickness T of the substrate 111 of the first display panel 110 may be less than or equal to the length L of the light emitting part EA2 of the plurality of second pixels PX2 . For example, when the substrate 111 of the first display panel 110 is longer than the length L of the light emitting part EA2 of the plurality of second pixels PX2 , the plurality of second pixels PX2 emit light. light may be blocked by the first display panel 110 . Accordingly, the thickness T of the substrate 111 of the first display panel 110 is configured to be less than or equal to the length of the light emitting part EA2 of the plurality of second pixels PX2, so that the plurality of second pixels ( The light emitted from the light emitting part EA2 of the PX2 may pass through the first display panel 110 . In this case, since the length of the light emitting part EA2 of the plurality of second pixels PX2 is 200 μm or less, the thickness of the substrate of the first display panel 110 may be 200 μm or less.

Hereinafter, structures of the plurality of first pixels PX1 and the plurality of second pixels PX2 will be described in detail with reference to FIG. 5 .

5 is a cross-sectional view taken along line IV-IV' of FIGS. 3A and 3B.

Referring to FIG. 5 , each of the first display panel 110 and the second display panel 120 includes substrates 111 and 121 , a transistor TR, a light emitting device 130 , and a color filter 150 .

The substrates 111 and 121 are substrates for supporting and protecting various components of the first display panel 110 and the second display panel 120 . The substrates 111 and 121 may be made of glass or flexible plastic.

A buffer layer 112 is disposed on the substrates 111 and 121 . The buffer layer 112 may improve adhesion between the layers formed on the buffer layer 112 and the substrates 111 and 121 , and block alkali components leaking from the substrates 111 and 121 . The buffer layer 112 may be formed of a single layer of silicon nitride (SiNx) or silicon oxide (SiOx) or a multilayer of silicon nitride (SiNx) and silicon oxide (SiOx). The buffer layer 112 may be omitted. For example, the buffer layer 112 may be omitted based on the type and material of the substrates 111 and 121 , the structure and type of the transistor TR, and the like.

The transistor TR may be disposed on the buffer layer 112 to drive the light emitting device 130 . The transistor TR includes an active layer AC, a gate electrode GE, a source electrode SE, and a drain electrode DE. The transistor TR illustrated in FIG. 5 is a driving transistor and is a thin film transistor having a top gate structure in which the gate electrode GE is disposed on the active layer AC. However, the present invention is not limited thereto, and the transistor TR may be implemented as a thin film transistor having a bottom gate structure.

The active layer AC of the transistor TR is disposed on the buffer layer 112 . The active layer AC is a region in which a channel is formed when the transistor TR is driven. The active layer AC may be formed of an oxide semiconductor, amorphous silicon (a-Si), polycrystalline silicon (poly-Si), or an organic semiconductor. have.

A gate insulating layer 113 is disposed on the active layer AC. The gate insulating layer 113 may be formed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx) or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx). A contact hole is formed in the gate insulating layer 113 through which the source electrode SE and the drain electrode DE respectively contact the source region and the drain region of the active layer AC. The gate insulating layer 113 may be formed over the entire surface of the substrates 111 and 121 as shown in FIG. 5 or may be patterned to have the same width as the gate electrode GE, but is not limited thereto.

The gate electrode GE is disposed on the gate insulating layer 113 . The gate electrode GE is disposed on the gate insulating layer 113 to overlap the channel region of the active layer AC. The gate electrode GE is formed of various metal materials, for example, molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and It may be any one of copper (Cu), an alloy of two or more, or a multilayer thereof.

An interlayer insulating layer 114 is disposed on the gate electrode GE. The interlayer insulating layer 114 may be formed of a single layer of inorganic silicon nitride (SiNx) or silicon oxide (SiOx) or a multilayer of silicon nitride (SiNx) or silicon oxide (SiOx). A contact hole is formed in the interlayer insulating layer 114 so that the source electrode SE and the drain electrode DE respectively contact the source region and the drain region of the active layer AC.

The source electrode SE and the drain electrode DE are disposed on the interlayer insulating layer 114 . The source electrode SE and the drain electrode DE are electrically connected to the active layer AC through contact holes of the gate insulating layer 113 and the interlayer insulating layer 114 . The source electrode SE and the drain electrode DE may include various metal materials, for example, molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), It may be made of any one of neodymium (Nd) and copper (Cu), an alloy of two or more, or a multilayer thereof.

5 shows only the driving transistor among the various transistors TR included in the first display panel 110 and the second display panel 120 for convenience of explanation, but other transistors such as a switching transistor may also be disposed. have.

Referring to FIG. 5 , a passivation layer 115 for protecting the transistor TR is disposed on the transistor TR. A contact hole for exposing the drain electrode DE of the transistor TR is formed in the passivation layer 115 . In FIG. 5 , a contact hole for exposing the drain electrode DE is formed in the passivation layer 115 , but a contact hole for exposing the source electrode SE may be formed. The passivation layer 115 may be formed of a single layer of silicon nitride (SiNx) or silicon oxide (SiOx) or multiple layers of silicon nitride (SiNx) or silicon oxide (SiOx). However, the passivation layer 115 may be omitted in some embodiments.

An overcoat layer 116 for planarizing an upper portion of the transistor TR is disposed on the passivation layer 115 . A contact hole for exposing the drain electrode DE of the transistor TR is formed in the overcoat layer 116 . In FIG. 5 , a contact hole for exposing the drain electrode DE is formed in the overcoat layer 116 , but a contact hole for exposing the source electrode SE may be formed. The overcoat layer 116 is an acrylic resin, an epoxy resin, a phenol resin, a polyamide resin, a polyimide resin, an unsaturated polyester resin, a polyphenylene ( polyphenylene) resin, polyphenylene sulfide resin, benzocyclobutene, and photoresist, but is not limited thereto.

Referring to FIG. 5 , the light emitting device 130 is disposed on the overcoat layer 116 . The light emitting device 130 is formed on the overcoat layer 116 and electrically connected to the drain electrode DE of the transistor TR 131 , the first electrode 131 , and the light emitting layer 132 disposed on the first electrode 131 . and a second electrode 133 formed on the emission layer 132 . Here, the first electrode 131 may be an anode electrode, and the second electrode 133 may be a cathode electrode.

The first electrode 131 is disposed on the overcoat layer 116 and is electrically connected to the drain electrode DE through a contact hole formed in the passivation layer 115 and the overcoat layer 116 . The first electrode 131 may be made of a conductive material having a high work function in order to supply holes to the emission layer 132 . For example, the first electrode 131 may include indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide ( It may be formed of a transparent conductive oxide based on zinc oxide (ZnO) and tin oxide (TO), but is not limited thereto.

Meanwhile, when the first display panel 110 and the second display panel 120 are top emission display panels, the light emitting device 130 is also configured in the top emission type. The first display panel 110 and the second display panel 120 according to the present invention may be a top emission type display panel for viewing an image through the front or rear side of the display device 100 . In the case of the top emission method, a reflective layer for reflecting the light emitted from the emission layer 132 toward the second electrode 133 may be disposed under the first electrode 131 . The reflective layer may be made of a material having excellent reflectivity, such as silver (Ag) or a silver alloy (Ag alloy), but is not limited thereto.

In FIG. 5 , the first electrode 131 is electrically connected to the drain electrode DE of the transistor TR through a contact hole, but the first electrode 131 is electrically connected to the drain electrode DE of the transistor TR. The electrode 131 may be configured to be electrically connected to the source electrode SE of the transistor TR through a contact hole.

A bank 117 is disposed on the first electrode 131 and the overcoat layer 116 . The bank 117 may cover a portion of the first electrode 131 of the light emitting device 130 to define a light emitting region. The bank 117 may be formed of an organic material. For example, the bank 117 may be formed of a polyimide resin, an acryl resin, or a benzocyclobutene resin, but is not limited thereto.

The emission layer 132 is disposed on the first electrode 131 . The emission layer 132 may be a white emission layer. The emission layer 132 may further include various layers such as a hole transport layer, a hole injection layer, a hole blocking layer, an electron injection layer, an electron blocking layer, an electron transport layer, and the like.

The second electrode 133 is disposed on the emission layer 132 . The second electrode 133 supplies electrons to the emission layer 132 . The second electrode 133 may be formed of a conductive material having a low work function. Since the transparent display panel 400 is a top emission type, the second electrode 133 has a transparent or semi-transmissive characteristic so that the light emitted from the emission layer 132 can pass through the second electrode 133 to be emitted to the outside. can have For example, the second electrode 133 may include indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), or zinc oxide (Zinc). Oxide, ZnO) and tin oxide (Tin Oxide, TO) may be made of a transparent conductive oxide or a ytterbium (Yb) alloy. Alternatively, the second electrode 133 may be made of a very thin metal material. However, the second electrode 133 is not limited to the above-described materials.

Referring to FIG. 5 , the encapsulation unit 140 is disposed on the light emitting device 130 . For example, the encapsulation unit 140 is disposed on the second electrode 133 to cover the organic light emitting diode 130 . The encapsulation unit 140 protects the organic light emitting diode 130 from moisture penetrating from the outside of the organic light emitting diode display 100 . The encapsulation unit 140 includes a first encapsulation layer 141 , a foreign material cover layer 142 , and a second encapsulation layer 143 .

The first encapsulation layer 141 may be disposed on the second electrode 133 to suppress penetration of moisture or oxygen. The first encapsulation layer 141 may be formed of an inorganic material such as silicon nitride (SiNx), silicon oxynitride (SiNxOy), or aluminum oxide (AlyOz), but is not limited thereto.

The foreign material cover layer 142 is disposed on the first encapsulation layer 141 to planarize the surface. In addition, the foreign material cover layer 142 may cover foreign materials or particles that may be generated during the manufacturing process. The foreign material cover layer 142 may be made of an organic material, for example, silicon oxycarbon (SiOxCz), acrylic or epoxy-based resin, but is not limited thereto.

The second encapsulation layer 143 is disposed on the foreign material cover layer 142 , and may suppress penetration of moisture or oxygen like the first encapsulation layer 141 . The second encapsulation layer 143 may be formed of an inorganic material such as silicon nitride (SiNx), silicon oxynitride (SiNxOy), silicon oxide (SiOx), or aluminum oxide (AlyOz), but is not limited thereto. The second encapsulation layer 143 may be made of the same material as the first encapsulation layer 141 or a different material.

Referring to FIG. 5 , the color filter 150 is disposed on the encapsulation unit 140 . The color filter 150 is in direct contact with the upper surface of the encapsulation unit 140 . A plurality of color filters 150 are provided to respectively correspond to the plurality of sub-pixels SP. The color filter 150 converts the light emitted from the light emitting unit (EA) 132 into light of a specific color. For example, the color filter 150 may include one selected from a red color filter, a green color filter, and a blue color filter. For example, it may be composed of a red color filter, a green color filter, and a blue color filter. That is, when the sub-pixel SP is the red sub-pixel SP, the color filter 150 may be a red color filter. Also, when the sub-pixel SP is a green sub-pixel SP, the color filter 150 may be a green color filter. Also, when the sub-pixel SP is a blue sub-pixel SP, the color filter 150 may be a blue color filter.

A planarization layer 160 is disposed on the color filter 150 . The planarization layer 160 is in direct contact with the upper surface and side surfaces of the color filter 150 and the upper surface of the encapsulation unit 140 . The planarization layer 160 planarizes the upper portion of the substrate 110 on which the color filter 150 is disposed. Similar to the overcoat layer 116 , the planarization layer 160 includes an acrylic resin, an epoxy resin, a phenol resin, a polyamide-based resin, a polyimide-based resin, an unsaturated polyester-based resin, a polyphenylene-based resin, and a polyphenylene sulfide-based resin. , benzocyclobutene, and photoresist, but is not limited thereto.

Referring to FIG. 5 , the transistor TR and the light emitting device 130 are not disposed in the transmission portion TA. That is, the transmission portion TA should be configured so that the second display panel 120 disposed under the first display panel 110 can be recognized. Accordingly, the light emitted from the second display panel 120 should be able to pass through the substrate 111 of the first display panel 110 in the transmission portion TA. Accordingly, since the transistor TR and the light emitting device 130 are not disposed in the transmissive part TA, transparency or translucency of the transmissive part TA may be implemented.

A transistor TR, a light emitting device 130 , and a color filter 150 are disposed in the light emitting units EA1 and EA2 . That is, the light emitting units EA1 and EA2 may be defined as regions in which a driving device such as the transistor TR, the light emitting device 130 , and the color filter 150 are disposed. In particular, as shown in FIGS. 4A and 4B , the light emitting units EA1 and EA2 may include a plurality of sub-pixels SP.

FIG. 6 is an enlarged view of area A of FIG. 1 . FIG. 7 is an enlarged view of area B of FIG. 1 .

Referring to FIG. 6 , some of the plurality of sub-pixels SP disposed in the second pixel PX2 overlapping the end of the first display panel 110 among the plurality of second pixels PX2 are spaced apart from each other. can be For example, the first sub-pixel SP1 , the third sub-pixel SP3 , and the second sub-pixel SP2 and the fourth sub-pixel SP4 may be disposed to be spaced apart from each other.

Referring to FIG. 6 , an end of the first display panel 110 is disposed to overlap the second sub-pixel SP2 and the fourth sub-pixel SP4 among the plurality of sub-pixels SP of the second pixel PX2 . can be Accordingly, the boundary L1 of the first display panel 110 is between the first sub-pixel SP1 and the third sub-pixel SP3 and the second sub-pixel SP2 and the fourth sub-pixel SP4 spaced apart from each other. is disposed in the , so that visibility deterioration in the plurality of second pixels PX2 overlapping the end of the first display panel 110 may be reduced.

Also, referring to FIG. 7 , each of the plurality of sub-pixels SP disposed in the second pixel PX2 overlapping the end of the first display panel 110 among the plurality of second pixels PX2 is spaced apart from each other. can be placed. For example, the first sub-pixel SP1 and the third sub-pixel SP3 and the second sub-pixel SP2 and the fourth sub-pixel SP4 are spaced apart from each other, and the first sub-pixel SP1 and the second sub-pixel SP4 are spaced apart from each other. The third sub-pixel SP3 and the second sub-pixel SP2 and the fourth sub-pixel SP4 may be spaced apart from each other.

Referring to FIG. 7 , each of the plurality of sub-pixels SP of the second pixel PX2 is disposed to overlap with ends of different first display panels 110 , and is disposed between each of the plurality of sub-pixels SP. A boundary of the first display panel 110 may be disposed. For example, the boundary L1 of the first display panel 110 disposed in the Y-axis direction is the first sub-pixel SP1, the third sub-pixel SP3, and the second sub-pixel of the second pixel PX2. A boundary L2 of the first display panel 110 disposed between SP2 and the fourth sub-pixel SP4 and disposed in the X-axis direction is disposed between the first sub-pixel SP1 and the third sub-pixel SP3. It may be disposed between and between the second sub-pixel SP2 and the fourth sub-pixel SP4 . Accordingly, a decrease in visibility in the plurality of second pixels PX2 overlapping the end of the first display panel 110 may be reduced.

In a typical tiling display device, a tiled display device is implemented by arranging a plurality of pixels respectively disposed on a first display panel and a second display panel that overlap each other to overlap on the same plane. For example, the plurality of first pixels of the first display panel and the plurality of second pixels of the second display panel overlap on the same plane, and the second display panel is formed between the plurality of first pixels of the first display panel. 2 pixels were placed. However, when the plurality of first pixels of the first display panel and the plurality of second pixels of the second display panel overlap on the same plane, only the first pixel and the second pixel are arranged side by side in a specific direction. There was a problem in that the resolution was increased.

Accordingly, in the display device 100 according to the exemplary embodiment of the present invention, the light emitting units EA1 of the plurality of first pixels PX1 and the light emitting units EA2 of the plurality of second pixels PX2 are alternately arranged, A high-resolution display device 100 can be implemented in the same area. For example, the light emitting part EA2 of the plurality of second pixels PX2 may be disposed to overlap the transmission part TA of the plurality of first pixels PX1 under the first display panel 110 . In this case, the light emitting part EA2 of the plurality of second pixels PX2 may be disposed on a lower side of the area overlapping the transmission part TA of the plurality of first pixels PX1 . Accordingly, the light emitting part EA2 of the plurality of second pixels PX2 is disposed to have a substantially zigzag pattern with the light emitting part EA1 of the plurality of first pixels PX1 , so that the display device 100 can move in a single direction. It is possible to reduce the increase in resolution only by Accordingly, the light emitting unit EA1 of the plurality of first pixels PX1 and the light emitting unit EA2 of the plurality of second pixels PX2 are alternately arranged to adjust the resolution of the display device 100 along the X and Y axes. direction, and thus, the display device 100 having a high resolution in the same area can be realized.

In addition, in the display device 100 according to an embodiment of the present invention, some of the plurality of sub-pixels SP of the second pixel PX2 overlapping the end of the first display panel 110 are disposed to be spaced apart from each other. , a decrease in visibility of the second pixel PX2 overlapping the end of the first display panel 110 may be reduced. When the end of the first display panel 110 is disposed on the light emitting part EA2 of the plurality of second pixels PX2 , that is, the plurality of sub-pixels SP, the first display panel 110 is disposed on the front surface of the display device 100 . The boundary L1 of the display panel 110 may be visually recognized. Accordingly, some of the plurality of sub-pixels SP of the second pixel PX2 may be spaced apart from each other with respect to the end of the first display panel 110 . For example, the ends of the first display panel 110 are the first sub-pixel SP1 and the third sub-pixel SP3 and the second sub-pixel SP2 and the fourth sub-pixel SP2 of the second pixel PX2 . SP4 , the first sub-pixel SP1 and the third sub-pixel SP3 , and the second sub-pixel SP2 and the fourth sub-pixel SP4 may be spaced apart from each other. In this case, the boundary of the first display panel 110 is the first sub-pixel SP1 and the third sub-pixel SP3 and the second sub-pixel SP2 and the fourth sub-pixel SP4 of the second pixel PX2 . can be placed between them. Accordingly, the plurality of second pixels PX2 overlapping the end of the first display panel 110 so that the boundary of the first display panel 110 and the plurality of sub-pixels SP of the second pixel PX2 do not overlap. By disposing some of the sub-pixels SP to be spaced apart from each other, a decrease in visibility in the plurality of second pixels PX2 overlapping the end of the first display panel 110 may be reduced.

A display device according to various embodiments of the present disclosure may be described as follows.

In a display device according to an embodiment of the present invention, a plurality of first pixels each including a light emitting part and a transmissive part are disposed, a first display panel made of a transparent display, and a plurality of second pixels including a light emitting part are disposed, , a second display panel disposed under the first display panel to partially overlap the first display panel, and the light emitting portion of the plurality of second pixels may be disposed to overlap with the transmitting portion of the plurality of first pixels.

According to another feature of the present invention, the light emitting units of the plurality of first pixels and the light emitting units of the plurality of second pixels may be alternately disposed.

According to another feature of the present invention, the area of the transmission portion of the plurality of first pixels may be greater than or equal to the area of the emission portion of the plurality of second pixels.

According to another feature of the present invention, the first display panel may include a substrate on which a plurality of first pixels are disposed, and the thickness of the substrate of the first display panel may be less than or equal to the length of the light emitting portions of the plurality of second pixels. have.

According to another feature of the present invention, the length of the light emitting portion of the plurality of second pixels may be 200 μm or less.

According to another feature of the present invention, the display device may further include an adhesive member for bonding the first display panel and the second display panel and made of a material having the same refractive index as that of the substrate of the first display panel.

According to another feature of the present invention, the second display panel may be formed of a transparent display.

According to another feature of the present invention, the light emitting part of the plurality of first pixels is disposed on the left side in the plurality of first pixels, and the transmitting part of the plurality of first pixels is on the right side of the plurality of first pixels in the plurality of first pixels can be placed in

According to another feature of the present invention, the display device may further include a wire part for driving the plurality of first pixels and the plurality of second pixels, and the wire part may be disposed at an end of the first display panel.

According to another feature of the present invention, the second display panel further includes a non-emission portion disposed in an area excluding the emission portion of the plurality of second pixels, and the electric wire portion extends from the first display panel to include the non-emission portion of the second display panel. can be placed in

According to another aspect of the present invention, the display device further includes a printed circuit board disposed on a surface opposite to one surface of the second display panel on which the first display panel is disposed, and the electric wire unit is disposed on the opposite surface of the one surface of the second display panel. may be connected to a printed circuit board.

According to another feature of the present invention, the electric wire portion may include silver paste (Ag paste).

According to another feature of the present invention, the plurality of second pixels includes a plurality of sub-pixels, and among the plurality of second pixels, at least one of the plurality of sub-pixels included in the second pixel overlapping the end of the first display panel Some may be spaced apart from each other.

According to another aspect of the present invention, the boundary of the first display panel may be disposed between sub-pixels spaced apart from each other among a plurality of sub-pixels included in the second pixel overlapping the end of the first display panel.

According to another aspect of the present invention, the display device may further include a connection substrate disposed on a surface opposite to one surface of the second display panel on which the first display panel is disposed.

A display device according to another embodiment of the present invention provides a first display panel in which a plurality of first pixels including a light emitting part and a transmissive part are disposed, and a plurality of second display panels including a light emitting part overlapping the transmissive part of the plurality of first pixels. A second display panel in which pixels are disposed may be included, and the light emitting units of the plurality of first pixels and the light emitting units of the plurality of second pixels may be alternately disposed.

According to another aspect of the present invention, the display device includes a wire part electrically connected to the plurality of first pixels and the plurality of second pixels, and the wire part extends from the end of the first display panel to connect the end of the second display panel. It may be arranged to wrap.

According to another feature of the present invention, the plurality of second pixels may include a plurality of sub-pixels, and some of the plurality of sub-pixels may be disposed to be spaced apart from each other with respect to a boundary of the first display panel.

According to another aspect of the present invention, a display device includes a connection substrate supporting a first display panel and a second display panel, a first adhesive member bonding the first display panel and the second display panel, and a second display panel; A second adhesive member for bonding the connection substrate may be further included.

According to another feature of the present invention, the first display panel may include a substrate on which a plurality of first pixels are disposed, and the first adhesive member may be made of a material having the same refractive index as that of the substrate of the first display panel.

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 within the scope without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to illustrate, and the scope of the technical spirit 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 not restrictive. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: display device
110: first display panel
120: second display panel
111, 121: substrate
112: buffer layer
113: gate insulating layer
114: interlayer insulating layer
115: passivation layer
116: over coating layer
117: bank
130: light emitting element
131: first electrode
132: light emitting layer
133: second electrode
140: encapsulation unit
141, 143: encapsulation layer
142: foreign material cover layer
150: color filter
160: planarization layer
171: first adhesive member
172: second adhesive member
180: connection board
190: wire part
TR: transistor
AC: active layer
GE: gate electrode
SE: source electrode
DE: drain electrode
P: printed circuit board
PX1: first pixel
PX2: second pixel
SP: sub pixel
TA: Transmissive part
EA1, EA2: light emitting part
CA1, CA2: drive
L1, L2: boundary of the first display panel

Claims (20)

a first display panel having a plurality of first pixels each including a light emitting part and a transmissive part and formed of a transparent display; and
a second display panel including a plurality of second pixels including a light emitting part and disposed under the first display panel to partially overlap the first display panel;
The light emitting part of the plurality of second pixels is disposed to overlap the transmissive part of the plurality of first pixels. According to claim 1,
The light emitting part of the plurality of first pixels and the light emitting part of the plurality of second pixels are alternately disposed. According to claim 1,
An area of the transmission portion of the plurality of first pixels is greater than or equal to an area of the emission portion of the plurality of second pixels. According to claim 1,
the first display panel includes a substrate on which the plurality of first pixels are disposed;
The thickness of the substrate of the first display panel is less than or equal to the length of the light emitting portion of the plurality of second pixels. 5. The method of claim 4,
A length of the light emitting portion of the plurality of second pixels is 200 μm or less. 5. The method of claim 4,
and an adhesive member bonding the first display panel and the second display panel and made of a material having the same refractive index as a substrate of the first display panel. According to claim 1,
and the second display panel is formed of a transparent display. According to claim 1,
The light emitting unit of the plurality of first pixels is disposed on a left side in the plurality of first pixels,
The transparent portion of the plurality of first pixels is disposed on a right side of the plurality of first pixels in the plurality of first pixels. According to claim 1,
Further comprising an electric wire for driving the plurality of first pixels and the plurality of second pixels,
and the electric wire part is disposed at an end of the first display panel. 10. The method of claim 9,
The second display panel further includes a non-light emitting part disposed in an area excluding the light emitting part of the plurality of second pixels,
The electric wire portion extends from the first display panel and is disposed on a non-emission portion of the second display panel. 11. The method of claim 10,
a printed circuit board disposed on a surface opposite to one surface of the second display panel on which the first display panel is disposed;
and the electric wire part is connected to the printed circuit board on a surface opposite to one surface of the second display panel. 10. The method of claim 9,
The electric wire portion includes silver paste (Ag paste). According to claim 1,
The plurality of second pixels includes a plurality of sub-pixels,
and at least some of a plurality of sub-pixels included in a second pixel overlapping an end of the first display panel among the plurality of second pixels are disposed to be spaced apart from each other. 14. The method of claim 13,
and a boundary of the first display panel is disposed between sub-pixels spaced apart from each other among a plurality of sub-pixels included in a second pixel overlapping an end of the first display panel. According to claim 1,
The display device of claim 1 , further comprising: a connection substrate disposed on a surface opposite to one surface of the second display panel on which the first display panel is disposed. a first display panel in which a plurality of first pixels including a light emitting part and a transmissive part are disposed; and
a second display panel in which a plurality of second pixels including a light emitting portion overlapping the transmission portion of the plurality of first pixels are disposed;
The light emitting part of the plurality of first pixels and the light emitting part of the plurality of second pixels are alternately disposed. 17. The method of claim 16,
a wire part electrically connected to the plurality of first pixels and the plurality of second pixels;
and the electric wire part extends from an end of the first display panel and is disposed to surround an end of the second display panel. 17. The method of claim 16,
The plurality of second pixels includes a plurality of sub-pixels,
a portion of the plurality of sub-pixels is disposed to be spaced apart from each other with respect to a boundary of the first display panel. 17. The method of claim 16,
a connection substrate supporting the first display panel and the second display panel;
a first adhesive member bonding the first display panel and the second display panel; and
The display device of claim 1 , further comprising a second adhesive member bonding the second display panel and the connection substrate to each other. 20. The method of claim 19,
the first display panel includes a substrate on which the plurality of first pixels are disposed;
and the first adhesive member is made of a material having the same refractive index as that of the substrate of the first display panel.

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