Display device

Abstract

The display device comprises a backlight unit, a liquid crystal layer disposed above the backlight unit, a first electrode disposed below the liquid crystal layer and overlapping at least a portion with a first light-emitting region, a second electrode disposed above the liquid crystal layer and overlapping at least a portion with a first light-emitting region, a third electrode disposed above the second electrode and overlapping at least a portion with a second light-emitting region adjacent to the first light-emitting region, a pixel defining film disposed above the third electrode and having a first opening that opens the third electrode and overlaps with the second light-emitting region, a light-emitting layer disposed within the first opening, and a fourth electrode disposed above the light-emitting layer and having a second opening that overlaps with the first light-emitting region.

Description

Technology Field

[0001] The present invention relates to a display device capable of adjusting the viewing angle. Background Technology

[0002] The display device may include a display area where an image is displayed. The image displayed in the display area may have a wide viewing angle, and the user of the display device can view the image displayed in the display area from various angles.

[0003] When a user of a display device uses the display device in public places, there is a concern that the user's privacy may be exposed. Accordingly, there is a growing need for a display device that allows the user to select between a wide-angle mode, where images are displayed with a wide viewing angle, and a narrow-angle mode, where images are displayed with a narrow viewing angle. The problem to be solved

[0004] The objective of the present invention is to provide a display device capable of selecting a wide viewing angle mode and a narrow viewing angle mode.

[0005] However, the purpose of the present invention is not limited to the aforementioned purpose and may be modified in various ways within the scope and spirit of the invention. means of solving the problem

[0006] To achieve the objectives of the present invention as described above, a display device according to embodiments may include a backlight unit, a liquid crystal layer disposed above the backlight unit, a first electrode disposed below the liquid crystal layer and overlapping at least a portion with a first light-emitting region, a second electrode disposed above the liquid crystal layer and overlapping at least a portion with the first light-emitting region, a third electrode disposed above the second electrode and overlapping at least a portion with a second light-emitting region adjacent to the first light-emitting region, a pixel defining film disposed above the third electrode and having a first opening that opens the third electrode and overlaps with the second light-emitting region, a light-emitting layer disposed within the first opening, and a fourth electrode disposed above the light-emitting layer and having a second opening that overlaps with the first light-emitting region.

[0007] In one embodiment, the display device may further include a partition pattern arranged to overlap with the first light-emitting region.

[0008] In one embodiment, the partition pattern may include a first partition pattern disposed between the second electrode and the pixel definition film.

[0009] In one embodiment, the pixel defining film may have a third opening that overlaps with the first light-emitting region.

[0010] In one embodiment, the partition pattern may include a second partition pattern disposed within the third opening.

[0011] In one embodiment, the partition pattern may include a third partition pattern disposed between the backlight unit and the first electrode.

[0012] In one embodiment, the bulkhead pattern may include a plurality of first bulkheads that extend in a first direction and are arranged in a second direction perpendicular to the first direction.

[0013] In one embodiment, the partition pattern may further include a plurality of second partitions that extend in the second direction and are arranged in the first direction.

[0014] In one embodiment, the backlight unit can emit straight light.

[0015] In one embodiment, the display device may further include an intermediate substrate disposed between the second electrode and the third electrode and including a driving transistor electrically connected to the third electrode.

[0016] In one embodiment, the intermediate substrate may further include a groove that overlaps with the first light-emitting region.

[0017] In one embodiment, the display device may further include a color filter layer disposed on the fourth electrode and overlapping with the first light-emitting region and the second light-emitting region.

[0018] To achieve the objectives of the present invention as described above, a display device according to embodiments may include a first electrode that overlaps at least a portion with a first light-emitting region, a first pixel defining film disposed on the first electrode and having a first opening that opens the first electrode and overlaps with the first light-emitting region, a first light-emitting layer disposed within the first opening, a second electrode disposed on the first light-emitting layer, a third electrode disposed on the second electrode and overlapping at least a portion with a second light-emitting region adjacent to the first light-emitting region, a second pixel defining film disposed on the third electrode and having a second opening that opens the third electrode and overlaps with the second light-emitting region, a second light-emitting layer disposed within the second opening, and a fourth electrode disposed on the second light-emitting layer and having a third opening that overlaps with the first light-emitting region.

[0019] In one embodiment, the display device may further include a partition pattern arranged to overlap with the first light-emitting region.

[0020] In one embodiment, the partition pattern may include a first partition pattern disposed between the second electrode and the second pixel defining film.

[0021] In one embodiment, the second pixel defining film may have a fourth opening that overlaps with the first light-emitting region.

[0022] In one embodiment, the partition pattern may include a second partition pattern disposed within the fourth opening.

[0023] In one embodiment, the bulkhead pattern may include a plurality of first bulkheads that extend in a first direction and are arranged in a second direction perpendicular to the first direction.

[0024] In one embodiment, the partition pattern may further include a plurality of second partitions that extend in the second direction and are arranged in the first direction.

[0025] In one embodiment, the display device may further include a color filter layer disposed on the fourth electrode and overlapping with the first light-emitting region and the second light-emitting region. Effects of the invention

[0026] A display device according to the embodiments may include a backlight unit, a liquid crystal layer disposed above the backlight unit, a first electrode disposed below the liquid crystal layer and overlapping at least a portion with a first light-emitting region, a second electrode disposed above the liquid crystal layer and overlapping at least a portion with the first light-emitting region, a third electrode disposed above the second electrode and overlapping at least a portion with a second light-emitting region adjacent to the first light-emitting region, a pixel defining film disposed above the third electrode and having a first opening that opens the third electrode and overlaps with the second light-emitting region, a light-emitting layer disposed within the first opening, and a fourth electrode disposed above the light-emitting layer and having a second opening that overlaps with the first light-emitting region. Accordingly, an image with a narrow viewing angle may be displayed in the first light-emitting region, and an image with a wide viewing angle may be displayed in the second light-emitting region.

[0027] A display device according to the embodiments may include a first electrode that overlaps at least a portion with a first light-emitting region, a first pixel defining film disposed on the first electrode and having a first opening that opens the first electrode and overlaps the first light-emitting region, a first light-emitting layer disposed within the first opening, a second electrode disposed on the first light-emitting layer, a third electrode disposed on the second electrode and overlapping at least a portion with a second light-emitting region adjacent to the first light-emitting region, a second pixel defining film disposed on the third electrode and having a second opening that opens the third electrode and overlaps the second light-emitting region, a second light-emitting layer disposed within the second opening, and a fourth electrode disposed on the second light-emitting layer and having a third opening that overlaps the first light-emitting region. Accordingly, an image with a narrow viewing angle may be displayed in the first light-emitting region, and an image with a wide viewing angle may be displayed in the second light-emitting region.

[0028] However, the effects of the present invention are not limited to the effects described above, and may be extended in various ways without departing from the spirit and scope of the present invention. Brief explanation of the drawing

[0029] FIGS. 1 and FIGS. 2 are plan views showing the display area of ​​a display device according to one embodiment of the present invention. FIG. 3 is a cross-sectional view for explaining a first embodiment of a pixel structure included in a display device according to one embodiment of the present invention. Figure 4 is an enlarged cross-sectional view of area A of Figure 3. FIG. 5 is a cross-sectional view illustrating a second embodiment of a pixel structure included in a display device according to one embodiment of the present invention. FIG. 6 is a cross-sectional view illustrating a third embodiment of a pixel structure included in a display device according to one embodiment of the present invention. FIG. 7 is a cross-sectional view illustrating a fourth embodiment of a pixel structure included in a display device according to one embodiment of the present invention. FIG. 8 is a plan view showing the display area of ​​a display device according to another embodiment of the present invention. FIG. 9 is a cross-sectional view illustrating a first embodiment of a pixel structure included in a display device according to another embodiment of the present invention. FIG. 10 is a plan view showing the display area of ​​a display device according to another embodiment of the present invention. FIG. 11 is a cross-sectional view illustrating a first embodiment of a pixel structure included in a display device according to another embodiment of the present invention. FIG. 12 is a cross-sectional view illustrating a second embodiment of a pixel structure included in a display device according to another embodiment of the present invention. Specific details for implementing the invention

[0030] Hereinafter, a display device according to embodiments of the present invention will be described in more detail with reference to the attached drawings. Identical or similar reference numerals are used for identical components in the attached drawings.

[0031] FIGS. 1 and FIGS. 2 are plan views showing the display area of ​​a display device according to one embodiment of the present invention.

[0032] Referring to FIG. 1, a plurality of pixels may be arranged in a display area (DA). The plurality of pixels may include a first pixel (PXR), a second pixel (PXG), and a third pixel (PXB). The first pixel (PXR) may be a pixel that emits red light, the second pixel (PXG) may be a pixel that emits green light, and the third pixel (PXB) may be a pixel that emits blue light. The plurality of pixels may be arranged in a first direction (D1) and a second direction (D2) that intersects the first direction (D1).

[0033] Each of the above plurality of pixels may include a first light-emitting region and a second light-emitting region. For example, a first pixel (PXR) may include first and second light-emitting regions (R1, R2), a second pixel (PXG) may include first and second light-emitting regions (G1, G2), and a third pixel (PXB) may include first and second light-emitting regions (B1, B2).

[0034] The first light-emitting region may be a region that emits light having a relatively narrow viewing angle. In one embodiment, a partition pattern (110) arranged in a first direction (D1) and extending in a second direction (D2) may be disposed in the first light-emitting region. The partition pattern (110) may limit the viewing angle of light emitted from the first light-emitting region in the first direction (D1). The second light-emitting region may be a region that emits light having a relatively wide viewing angle.

[0035] In one embodiment, when the display device is driven in a narrow viewing angle mode, light may be emitted in the first light-emitting region, and light may not be emitted in the second light-emitting region.

[0036] In one embodiment, when the display device is driven in a wide viewing angle mode, light may not be emitted from the first light-emitting region, and light may be emitted from the second light-emitting region. In another embodiment, when the display device is driven in a wide viewing angle mode, light may be emitted from each of the first light-emitting region and the second light-emitting region.

[0037] Referring to FIG. 2, the configurations arranged in the display area (DA) illustrated in FIG. 2 may be substantially identical to the configurations arranged in the display area (DA) illustrated in FIG. 1, except for the planar shape of the partition pattern (110) arranged in the first light-emitting area. For example, as illustrated in FIG. 2, the partition pattern (110) may include a vertical partition pattern arranged in a first direction (D1) and extending in a second direction (D2), and a horizontal partition pattern arranged in the second direction (D2) and extending in the first direction (D1). Accordingly, the partition pattern (110) may limit the viewing angle of light emitted from the first light-emitting area in the first direction (D1) and the second direction (D2).

[0038] The planar shape of the partition pattern (110) is not limited to the planar shape of the partition pattern (110) shown in FIGS. 1 and FIGS. 2. The partition pattern (110) may have any planar shape that can limit the viewing angle of light emitted from the first light-emitting region. For example, the partition pattern (110) may have a circular or polygonal planar shape.

[0039] FIG. 3 is a cross-sectional view for explaining a first embodiment of a pixel structure included in a display device according to one embodiment of the present invention.

[0040] Referring to FIG. 3, the first pixel (PXR) may include a backlight unit (BLU), a first base substrate (BS1), a first polarizing layer (POL1), a first insulating layer (IL1), a second insulating layer (IL2), a liquid crystal layer (LC), a first buffer layer (BUF), a second polarizing layer (POL2), a second buffer layer (BUF2), a second base substrate (BS2), a third insulating layer (IL3), a fourth insulating layer (IL4), a fifth insulating layer (IL5), a pixel defining layer (PDL), an emitting layer (EL), an encapsulation layer (EN), a color filter layer (CF), a first active layer (ATV1), a first gate electrode (GE1), a first source-drain electrode (SDE1), a first electrode (E1), a second electrode (E2), a second active layer (ATV2), a second gate electrode (GE2), a second source-drain electrode (SDE2), a third electrode (E3), a fourth electrode (E4), and a first barrier pattern (100).

[0041] The backlight unit (BLU) may include a light-emitting material. For example, the backlight unit (BLU) may include an LED. The backlight unit (BLU) may emit light in the direction of the liquid crystal layer (LC).

[0042] A first base substrate (BS1) may be disposed on the backlight unit (BLU). The first base substrate (BS1) may include a transparent material. For example, the first base substrate (BS1) may include glass, plastic, etc.

[0043] A first polarizing layer (POL1) may be disposed on the first base substrate (BS1). The first polarizing layer (POL1) can polarize light emitted from a backlight unit (BLU).

[0044] A first gate electrode (GE1) may be disposed on the first polarization layer (POL1). The first gate electrode (GE1) may include a conductive material.

[0045] A first insulating layer (IL1) covering a first gate electrode (GE1) may be disposed on the first polarizing layer (POL1).

[0046] A first active layer (ATV1) may be disposed on the first insulating layer (IL1). The first active layer (ATV1) may include a semiconductor material.

[0047] A first source-drain electrode (SDE1) may be disposed on the first active layer (ATV1). The first source-drain electrode (SDE1) may be electrically in contact with at least a portion of the first active layer (ATV1). The first gate electrode (GE1), the first active layer (ATV1), and the first source-drain electrode (SDE1) may define a first driving transistor.

[0048] A second insulating layer (IL2) may be disposed on the first insulating layer (IL1). The second insulating layer (IL2) may cover the first active layer (ATV1) and the first source-drain electrode (SDE1).

[0049] A first electrode (E1) may be disposed on the second insulating layer (IL2). The first electrode (E1) may be electrically in contact with the first source-drain electrode (SDE1). At least a portion of the first electrode (E1) may overlap with the first light-emitting region (R1). In one embodiment, the first electrode (E1) may not overlap with the second light-emitting region (R2).

[0050] A liquid crystal layer (LC) may be disposed on the first electrode (E1). The liquid crystal layer (LC) can change the phase of light according to the electrical signals of the first electrode (E1) and the second electrode (E2).

[0051] A second electrode (E2) may be disposed on the liquid crystal layer (LC). At least a portion of the second electrode (E2) may overlap with the first light-emitting region (R1). In one embodiment, the second electrode (E2) may not overlap with the second light-emitting region (R2).

[0052] A first buffer layer (BUF) may be disposed on the liquid crystal layer (LC). The first buffer layer (BUF) may cover the second electrode (E2). The first buffer layer (BUF1) may include an inorganic insulating material.

[0053] A second polarization layer (POL2) may be disposed on the first buffer layer (BUF). The second polarization layer (POL2) can selectively transmit light having a specific phase among the light passing through the liquid crystal layer (LC).

[0054] A second buffer layer (BUF2) may be disposed on the second polarization layer (POL2). The second buffer layer (BUF2) may include an inorganic insulating material.

[0055] A second base substrate (BS2) may be disposed on the second buffer layer (BUF2). The second base substrate (BS2) may include a transparent material. For example, the second base substrate (BS2) may include glass, plastic, etc.

[0056] A second active layer (ATV2) may be disposed on the second base substrate (BS2). The second active layer (ATV2) may include a semiconductor material.

[0057] A third insulating layer (IL3) may be disposed on the second base substrate (BS2). The third insulating layer (IL3) may cover the second active layer (ATV2).

[0058] A second gate electrode (GE2) may be disposed on the third insulating layer (IL3). The second gate electrode (GE2) may include a conductive material.

[0059] A fourth insulating layer (IL4) may be disposed on the third insulating layer (IL3). The fourth insulating layer (IL4) may cover the second gate electrode (GE2).

[0060] A second source-drain electrode (SDE2) may be disposed on the fourth insulating layer (IL4). The second source-drain electrode (SDE2) may be electrically in contact with at least a portion of the second active layer (ATV2). The second active layer (ATV2), the second gate electrode (GE2), and the second source-drain electrode (SDE2) may define a second driving transistor.

[0061] A fifth insulating layer (IL5) may be disposed on the fourth insulating layer (IL4). The fifth insulating layer (IL5) may cover the second source-drain electrode (SDE2).

[0062] A third electrode (E3) may be placed on the fifth insulating layer (IL5). The third electrode (E3) may be electrically in contact with the second source-drain electrode (SDE2).

[0063] A pixel defining film (PDL) may be disposed on the fifth insulating layer (IL5). The pixel defining film (PDL) may include a first opening that opens the third electrode (E3). The first opening may overlap with the second light-emitting region (R2).

[0064] A light-emitting layer (EL) may be disposed within the first opening. The light-emitting layer (EL) may also be disposed on the pixel defining film (PDL). The light-emitting layer (EL) may be disposed to overlap with the first light-emitting region (R1) and the second light-emitting region (R2). In one embodiment, the light-emitting layer (EL) may include an organic light-emitting material. In this case, the light-emitting layer (EL) may further include at least one of an electron injection layer, an electron transport layer, a hole injection layer, and a hole transport layer.

[0065] A fourth electrode (E4) may be disposed on the light-emitting layer (EL). The fourth electrode (E4) may have a second opening in which at least a portion overlaps with the first light-emitting region (R1).

[0066] A sealing layer (EN) may be disposed on the fourth electrode (E4). In one embodiment, the sealing layer (EN) may include a first inorganic sealing layer, an organic sealing layer, and a second inorganic sealing layer stacked in sequence.

[0067] A color filter layer (CF) may be placed on top of the encapsulation layer (EN). The color filter layer (CF) can selectively transmit light of a specific wavelength.

[0068] The first barrier pattern layer (100) may be positioned to overlap with the first light-emitting region (R1). The first barrier pattern layer (100) may be positioned between the second base substrate (BS2) and the pixel defining film (PDL). For example, as shown in FIG. 3, the first barrier pattern layer (100) may be formed on the fourth insulating layer (IL4) to penetrate the fifth insulating layer (IL5).

[0069] The first partition pattern layer (100) may include a first partition pattern (110). Light emitted from the backlight unit (BLU) and passing through the liquid crystal layer (LC) may pass through the first partition pattern (110) and have a relatively narrow viewing angle. Accordingly, an image with a narrow viewing angle may be displayed in the first light-emitting region (R1).

[0070] FIG. 3 illustrates an embodiment in which the first partition pattern layer (100) penetrates the fifth insulating layer (IL5) and is formed on the fourth insulating layer (IL4), but the present invention is not limited thereto. For example, the first partition pattern layer (100) may be formed on the second base substrate (BS2) by penetrating the fourth insulating layer (IL4) and the third insulating layer (IL3).

[0071] Figure 4 is an enlarged cross-sectional view of area A of Figure 3.

[0072] Referring to FIG. 4, the first partition pattern layer (100) may include the first partition pattern (110) and the organic layer (OL).

[0073] The first barrier pattern (110) may be positioned substantially perpendicular to the upper surface of the fourth insulating layer (IL4). The first barrier pattern (110) may include a material capable of blocking light. For example, the first barrier pattern (110) may include an inorganic insulating material with a relatively high light absorption rate.

[0074] The organic layer (OL) may be disposed adjacent to the first partition pattern (110). The organic layer (OL) may include an organic material with a relatively high light transmittance.

[0075] In one embodiment, the first partition pattern (110) may include a first lower partition pattern (111) and a first upper partition pattern (112), and the organic layer (OL) may include a first organic layer (OL), a second organic layer (OL2) and a third organic layer (OL3).

[0076] The first partition pattern (110) may come into contact with the side of the first organic layer (OL1). In one embodiment, after forming the first organic layer (OL1) on the fourth insulating layer (IL4), an inorganic insulating material covering the fourth insulating layer (IL4) and the first organic layer (OL1) may be formed, and the inorganic insulating material may be anisotropically dry-etched to form the first lower partition pattern (111).

[0077] A portion of the first upper partition pattern (112) may be placed on the first lower partition pattern (111), and the first upper partition pattern (112) may be in contact with the side of the second organic layer (OL2). In one embodiment, after forming the first lower partition pattern (111), the second organic layer (OL2) may be formed on the fourth insulating layer (IL4), an inorganic insulating material covering the fourth insulating layer (IL4) and the second organic layer (OL2) may be formed, and the second upper partition pattern (112) may be formed by anisotropic dry etching of the inorganic insulating material.

[0078] A third organic layer (OL3) can be placed on top of a first organic layer (OL1). In one embodiment, after forming a second upper partition pattern (112), a third organic layer (OL3) can be formed on top of the first organic layer (OL1).

[0079] In FIG. 4, an embodiment is illustrated in which the partition pattern (110) includes a first lower partition pattern (111) and a first upper partition pattern (112), but the invention is not limited thereto. For example, the partition pattern (110) may include three partition patterns stacked in sequence so as to be substantially perpendicular to the upper surface of the fourth insulating layer (IL4).

[0080] FIG. 5 is a cross-sectional view illustrating a second embodiment of a pixel structure included in a display device according to one embodiment of the present invention. Description of a configuration substantially identical to the configuration described with reference to FIG. 3 may be omitted.

[0081] Referring to FIG. 5, in the first light-emitting region (R1), the light-emitting layer (EL) can be removed. Accordingly, light emitted from the backlight unit (BLU) and passing through the liquid crystal layer (LC) and the first partition pattern layer (100) in sequence may not pass through the light-emitting layer (EL).

[0082] FIG. 6 is a cross-sectional view illustrating a third embodiment of a pixel structure included in a display device according to an embodiment of the present invention. Description of a configuration substantially identical to the configuration described with reference to FIG. 3 may be omitted.

[0083] Referring to FIG. 6, a third opening may be formed in the pixel defining film (PLD) that overlaps with the first light-emitting region (R1). A second partition pattern layer (200) may be disposed inside the third opening formed in the pixel defining film (PDL). The second partition pattern layer (200) may include a second partition pattern (210). The second partition pattern layer (200) and the second partition pattern (210) may be substantially identical to the first partition pattern layer (100) and the first partition pattern (110) described with reference to FIG. 3 and FIG. 4. Accordingly, the viewing angle of light emitted from the backlight unit (BLU) and passing through the liquid crystal layer (LC) can be controlled by the second partition pattern (210), and an image with a narrow viewing angle can be displayed in the first light-emitting region (R1).

[0084] FIG. 7 is a cross-sectional view illustrating a fourth embodiment of a pixel structure included in a display device according to an embodiment of the present invention. Description of a configuration substantially identical to the configuration described with reference to FIG. 3 may be omitted.

[0085] Referring to FIG. 7, a third partition pattern layer (300) may be disposed between a backlight unit (BLU) and a first base substrate (BS1). The third partition pattern layer (300) may include a third partition pattern (310). The third partition pattern layer (300) may overlap with a first light-emitting region (R1). The third partition pattern layer (300) and the third partition pattern (310) may be substantially identical to the first partition pattern layer (100) and the first partition pattern (110) described with reference to FIG. 3 and FIG. 4. Accordingly, the viewing angle of light emitted from the backlight unit (BLU) can be controlled by the third partition pattern (310), and a narrow viewing angle image can be displayed in the first light-emitting region (R1).

[0086] FIG. 8 is a plan view showing the display area of ​​a display device according to another embodiment of the present invention.

[0087] Referring to FIG. 8, a plurality of pixels may be arranged in a display area (DA'). The plurality of pixels may include a first pixel (PXR'), a second pixel (PXG'), and a third pixel (PXB'). The first pixel (PXR') may be a pixel that emits red light, the second pixel (PXG') may be a pixel that emits green light, and the third pixel (PXB') may be a pixel that emits blue light. The plurality of pixels may be arranged in a first direction (D1) and a second direction (D2) that intersects the first direction (D1).

[0088] Each of the above plurality of pixels may include a first light-emitting region and a second light-emitting region. For example, a first pixel (PXR') may include first and second light-emitting regions (R1', R2'), a second pixel (PXG') may include first and second light-emitting regions (G1', G2'), and a third pixel (PXB') may include first and second light-emitting regions (B1', B2').

[0089] The first light-emitting region may be a region that emits light having a relatively narrow viewing angle. The second light-emitting region may be a region that emits light having a relatively wide viewing angle.

[0090] In one embodiment, when the display device is driven in a narrow viewing angle mode, light may be emitted in the first light-emitting region, and light may not be emitted in the second light-emitting region.

[0091] In one embodiment, when the display device is driven in a wide viewing angle mode, light may not be emitted from the first light-emitting region, and light may be emitted from the second light-emitting region. In another embodiment, when the display device is driven in a wide viewing angle mode, light may be emitted from each of the first light-emitting region and the second light-emitting region.

[0092] FIG. 9 is a cross-sectional view illustrating a first embodiment of a pixel structure included in a display device according to another embodiment of the present invention. Description of a configuration substantially identical to the configuration described with reference to FIG. 3 may be omitted.

[0093] Referring to FIG. 9, the first pixel (PXR') comprises a backlight unit (BLU'), a first base substrate (BS1'), a first polarizing layer (POL1'), a first insulating layer (IL1'), a second insulating layer (IL2'), a liquid crystal layer (LC'), a first buffer layer (BUF'), a second polarizing layer (POL2'), a second buffer layer (BUF2'), a second base substrate (BS2'), a third insulating layer (IL3'), a fourth insulating layer (IL4'), a fifth insulating layer (IL5'), a pixel defining layer (PDL'), an emitting layer (EL'), an encapsulation layer (EN'), a color filter layer (CF'), a first active layer (ATV1'), a first gate electrode (GE1'), a first source-drain electrode (SDE1'), a first electrode (E1'), a second electrode (E2'), a second active layer (ATV2'), a second gate electrode (GE2'), a second source-drain electrode (SDE2'), and a third It may include an electrode (E3') and a fourth electrode (E4').

[0094] The light emitted from the backlight unit (BLU) may be straight light. The straight light may be light traveling in a direction perpendicular to the first direction (D1 in FIG. 1 and 2) and the second direction (D2 in FIG. 1 and 2).

[0095] In this case, a groove (GR) overlapping with a first light-emitting region (R1') may be formed in an intermediate substrate defined by a second buffer layer (BUF2'), a second base substrate (BS2'), a third insulating layer (IL3'), a fourth insulating layer (IL4'), and a fifth insulating layer (IL5'). In one embodiment, when the pixel defining film (PDL') has a third opening that overlaps with the first light-emitting region (R1'), the groove (GR) may overlap with the third opening.

[0096] The straight light emitted from the backlight unit (BLU') can pass through the liquid crystal layer (LC') and the groove (GR) in sequence. Accordingly, a narrow viewing angle image can be displayed in the first light-emitting region (R1').

[0097] FIG. 10 is a plan view showing the display area of ​​a display device according to another embodiment of the present invention.

[0098] Referring to FIG. 10, a plurality of pixels may be arranged in a display area (DA``). The plurality of pixels may include a first pixel (PXR``), a second pixel (PXG``), and a third pixel (PXB``). The first pixel (PXR``), the second pixel (PXG``), and the third pixel (PXB``) may be substantially identical to the first pixel (PXR), the second pixel (PXG), and the third pixel (PXB) described with reference to FIG. 1 and FIG. 2.

[0099] Each of the plurality of pixels may include a first light-emitting region and a second light-emitting region. For example, a first pixel (PXR) may include first and second light-emitting regions (R1, R2), a second pixel (PXG) may include first and second light-emitting regions (G1, G2), and a third pixel (PXB) may include first and second light-emitting regions (B1, B2).

[0100] The first light-emitting region may be a region that emits light having a relatively narrow viewing angle. In one embodiment, the first light-emitting region may have a partition pattern (110``) arranged in a first direction (D1) and extending in a second direction (D2), and a horizontal partition pattern arranged in the second direction (D2) and extending in the first direction (D1). The partition pattern (110``) may be substantially the same as the partition pattern (110) described with reference to FIG. 2.

[0101] In one embodiment, when the display device is driven in a narrow viewing angle mode, light may be emitted in the first light-emitting region, and light may not be emitted in the second light-emitting region.

[0102] In one embodiment, when the display device is driven in a wide viewing angle mode, light may not be emitted from the first light-emitting region, and light may be emitted from the second light-emitting region. In another embodiment, when the display device is driven in a wide viewing angle mode, light may be emitted from each of the first light-emitting region and the second light-emitting region.

[0103] The planar shape of the partition pattern (110'') is not limited to the planar shape of the partition pattern (110) shown in FIG. 10. The partition pattern (110'') can have any planar shape that can limit the viewing angle of light emitted from the first light-emitting region. For example, the partition pattern (110'') can have a circular or polygonal planar shape.

[0104] FIG. 11 is a cross-sectional view illustrating a first embodiment of a pixel structure included in a display device according to another embodiment of the present invention.

[0105] Referring to FIG. 11, the first pixel (PXR) comprises a first base substrate (BS1), a first insulating layer (IL1), a second insulating layer (IL2), a third insulating layer (IL3), a first pixel defining layer (PDL1), a first emitting layer (EL1), a first encapsulating layer (EN1), a first buffer layer (BUF), a light-blocking layer (LBL), a second base substrate (BS2), a fourth insulating layer (IL4), a fifth insulating layer (IL5), a sixth insulating layer (IL6), a second pixel defining layer (PDL2), a second emitting layer (EL2), a second encapsulating layer (EN2), a color filter layer (CF), a first active layer (ATV1), a first gate electrode (GE1), a first source-drain electrode (SDE1), a first electrode (E1), a second electrode (E2), and a second It may include an active layer (ATV2''), a second gate electrode (GE2''), a second source-drain electrode (SDE2''), a third electrode (E3'') and a fourth electrode (E4'').

[0106] The first base substrate (BS1'') may include a transparent material. For example, the first base substrate (BS1'') may include glass, plastic, etc.

[0107] A first active layer (ATV1) may be disposed on a first base substrate (BS1). The first active layer (ATV1) may include a semiconductor material.

[0108] A first insulating layer (IL1) may be disposed on the first base substrate (BS1). The first insulating layer (IL1) may cover the first active layer (ATV1).

[0109] A first gate electrode (GE1) may be disposed on the first insulating layer (IL1). The first gate electrode (GE1) may include a conductive material.

[0110] A second insulating layer (IL2'') may be disposed on the first insulating layer (IL1''). The second insulating layer (IL2'') may cover the first gate electrode (GE1'').

[0111] A first source-drain electrode (SDE1) may be disposed on the second insulating layer (IL2). The first source-drain electrode (SDE1) may be electrically in contact with the first active layer (ATV1). The first active layer (ATV1), the first gate electrode (GE1), and the first source-drain electrode (SDE1) may define a first driving transistor.

[0112] A third insulating layer (IL3'') may be disposed on the second insulating layer (IL2''). The third insulating layer (IL3'') may cover the first source-drain electrode (SDE1'').

[0113] A first electrode (E1'') may be disposed on the third insulating layer (IL3''). The first electrode (E1'') may be electrically in contact with the first source-drain electrode (SDE1''). At least a portion of the first electrode (E1'') may overlap with the first light-emitting region (R1'').

[0114] A first pixel defining film (PDL1``) may be disposed on the first electrode (E1``). The first pixel defining film (PDL1``) may include a first opening that opens the first electrode (E1``). The first opening may overlap with a first light-emitting region (R1``).

[0115] The first light-emitting layer (EL1'') may be disposed within the first opening. In one embodiment, the first light-emitting layer (EL'') may include an organic light-emitting material.

[0116] A second electrode (E2'') can be placed on the first light-emitting layer (EL1'').

[0117] A first encapsulation layer (EN1``) may be disposed on the second electrode (E2``). In one embodiment, the first encapsulation layer (EN1``) may include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in sequence.

[0118] A first buffer layer (BUF) may be disposed on the first encapsulation layer (EN1). The first buffer layer (BUF) may include an insulating material.

[0119] A second base substrate (BS2'') may be disposed on the first buffer layer (BUF''). The second base substrate (BS2'') may include a transparent material. For example, the second base substrate (BS2'') may include glass, plastic, etc.

[0120] A light-blocking layer (LBL) may be disposed on the first buffer layer (BUF). The light-blocking layer (LBL) may include an opening that overlaps with the first light-emitting region (R1). The light-blocking layer (LBL) may block a portion of the light emitted from the first light-emitting layer (EL) so that the light emitted from the first light-emitting layer (EL) does not proceed to the second light-emitting region (R2). In one embodiment, the light-blocking layer (LBL) may be omitted.

[0121] A second active layer (ATV2'') may be disposed on the second base substrate (BS2''). The second active layer (ATV2'') may include a semiconductor material.

[0122] A fourth insulating layer (IL4'') may be disposed on the second base substrate (BS2''). The fourth insulating layer (IL4'') may cover the second active layer (ATV2'').

[0123] A second gate electrode (GE2) may be disposed on the fourth insulating layer (IL4). The second gate electrode (GE2) may include a conductive material.

[0124] A fifth insulating layer (IL5'') may be disposed on the fourth insulating layer (IL4''). The fifth insulating layer (IL5'') may cover the second gate electrode (GE2'').

[0125] A second source-drain electrode (SDE2'') may be disposed on the fifth insulating layer (IL5''). The second source-drain electrode (SDE2'') may be electrically in contact with the second active layer (ATV2''). The second active layer (ATV2''), the second gate electrode (GE2''), and the second source-drain electrode (SDE2'') may define a second driving transistor.

[0126] A sixth insulating layer (IL6'') may be disposed on top of the fifth insulating layer (IL5''). The sixth insulating layer (IL6'') may cover the second source-drain electrode (SDE2'').

[0127] A third electrode (E3'') may be disposed on the sixth insulating layer (IL6''). At least a portion of the third electrode (E3'') may overlap with the second light-emitting region (R2'').

[0128] A second pixel defining film (PDL2'') may be disposed on the third electrode (E3''). The second pixel defining film (PDL2'') may include a second opening that opens the third electrode (E3''). The second opening may overlap with a second light-emitting region (R2'').

[0129] The second light-emitting layer (EL2'') may be disposed within the second opening. In one embodiment, the second light-emitting layer (EL2'') may include an organic light-emitting material. In one embodiment, the second light-emitting layer (EL2'') may be removed in the first light-emitting region (R1'').

[0130] A fourth electrode (E4'') may be disposed on the second light-emitting layer (EL2''). The fourth electrode (E4'') may include a third opening that overlaps with the first light-emitting region (R1'').

[0131] A second encapsulation layer (EN2'') may be disposed on the fourth electrode (E4''). In one embodiment, the second encapsulation layer (EN2'') may include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in sequence.

[0132] A color filter layer (CF) can be disposed on the second encapsulation layer (EN2). The color filter layer (CF) can selectively transmit light of a specific wavelength.

[0133] The first barrier pattern layer (100'') may be positioned to overlap with the first light-emitting region (R1''). Specifically, the first barrier pattern layer (100'') may be positioned between the second base substrate (BS2'') and the second pixel defining film (PDL''). The first barrier pattern layer (100'') may include a first barrier pattern (110''). The first barrier pattern layer (100'') and the first barrier pattern (110'') may be substantially identical to the first barrier pattern layer (100) and the first barrier pattern (110) described with reference to FIGS. 3 and 4.

[0134] Light emitted from the first light-emitting layer (EL1'') passes through the first barrier pattern (110'') and can have a relatively narrow viewing angle. Accordingly, an image with a narrow viewing angle can be displayed in the first light-emitting region (R1'').

[0135] FIG. 11 illustrates an embodiment in which the first partition pattern layer (100'') penetrates the sixth insulating layer (IL6') and is formed on the fifth insulating layer (IL5''), but the present invention is not limited thereto. For example, the first partition pattern layer (100'') may be formed on the second base substrate (BS2'') by penetrating the fifth insulating layer (IL5'') and the fourth insulating layer (IL4'').

[0136] In one embodiment, the second light-emitting layer (EL2'') may be removed in the first light-emitting region (R1''). Accordingly, light emitted from the first light-emitting layer (EL1'') may not pass through the second light-emitting layer (EL2'').

[0137] FIG. 12 is a cross-sectional view illustrating a second embodiment of a pixel structure included in a display device according to another embodiment of the present invention. Description of a configuration substantially identical to the configuration described with reference to FIG. 11 may be omitted.

[0138] Referring to FIG. 12, an opening may be formed in the second pixel defining film (PDL2'') that overlaps with the first light-emitting region (R1''). A second barrier pattern layer (200'') may be disposed inside the opening formed in the second pixel defining film (PDL''). The second barrier pattern layer (200'') may include a second barrier pattern (210''). The second barrier pattern layer (200'') and the second barrier pattern (210'') may be substantially identical to the first barrier pattern layer (100) and the first barrier pattern (110) described with reference to FIG. 3 and FIG. 4. Accordingly, the viewing angle of light emitted from the first organic light-emitting layer (EL1'') can be controlled by the second barrier pattern (210''), and a narrow viewing angle image can be displayed in the first light-emitting region (R1'').

[0139] Although the foregoing description refers to exemplary embodiments of the present invention, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the invention as set forth in the following claims. Industrial applicability

[0140] The present invention can be applied to various display devices that may be equipped with a display device. For example, the present invention can be applied to high-resolution smartphones, smartpads, smartwatches, tablet PCs, vehicle navigation systems, televisions, computer monitors, etc. Explanation of the symbols

[0141] BLU: Backlight Unit LC: Liquid Crystal Layer E1: First electrode E2: Second electrode E3: Third electrode E4: Fourth electrode PDL: Pixel Defined Layer EL: Emitting Layer R1, B1, G1: First light-emitting region R2, B2, G2: Second light-emitting region

Claims

Claim 1 A display device comprising: a backlight unit; a liquid crystal layer disposed above the backlight unit; a first electrode disposed below the liquid crystal layer and overlapping at least a portion with a first light-emitting region; a second electrode disposed above the liquid crystal layer and overlapping at least a portion with the first light-emitting region; a third electrode disposed above the second electrode and overlapping at least a portion with a second light-emitting region adjacent to the first light-emitting region; a pixel defining film disposed above the third electrode and having a first opening that opens the third electrode and overlaps with the second light-emitting region; a light-emitting layer disposed within the first opening; and a fourth electrode disposed above the light-emitting layer and having a second opening that overlaps with the first light-emitting region, wherein the second electrode does not overlap with the second light-emitting region. Claim 2 A display device according to claim 1, further comprising a partition pattern arranged to overlap with the first light-emitting region. Claim 3 A display device according to paragraph 2, wherein the partition pattern comprises a first partition pattern disposed between the second electrode and the pixel definition film. Claim 4 A display device according to paragraph 2, wherein the pixel defining film has a third opening that overlaps with the first light-emitting region. Claim 5 A display device according to claim 4, wherein the above partition pattern includes a second partition pattern disposed within the third opening. Claim 6 A display device according to paragraph 2, characterized in that the partition pattern includes a third partition pattern disposed between the backlight unit and the first electrode. Claim 7 A display device according to paragraph 2, wherein the above-mentioned partition pattern includes a plurality of first partitions that extend in a first direction and are arranged in a second direction perpendicular to the first direction. Claim 8 A display device according to claim 7, wherein the above-mentioned partition pattern further comprises a plurality of second partitions that extend in the second direction and are arranged in the first direction. Claim 9 A display device according to claim 1, wherein the backlight unit emits straight light. Claim 10 A display device according to claim 9, further comprising an intermediate substrate disposed between the second electrode and the third electrode and including a driving transistor electrically connected to the third electrode. Claim 11 A display device according to claim 10, wherein the intermediate substrate further comprises a groove that overlaps with the first light-emitting region. Claim 12 A display device according to claim 1, further comprising a color filter layer disposed on the fourth electrode and overlapping with the first light-emitting region and the second light-emitting region. Claim 13 A display device comprising: a first electrode having at least a portion of a first light-emitting region overlapping with the first light-emitting region; a first pixel defining film disposed on the first electrode and having a first opening that overlaps with the first light-emitting region and opens the first electrode to directly cover the edge of the first electrode; a first light-emitting layer disposed within the first opening and comprising an organic light-emitting material; a second electrode disposed on the first light-emitting layer; a third electrode disposed on the second electrode and having at least a portion of a second light-emitting region adjacent to the first light-emitting region; a second pixel defining film disposed on the third electrode and having a second opening that overlaps with the second light-emitting region and opens the third electrode; a second light-emitting layer disposed within the second opening; and a fourth electrode disposed on the second light-emitting layer and having a third opening that overlaps with the first light-emitting region. Claim 14 A display device according to claim 13, further comprising a partition pattern arranged to overlap with the first light-emitting region. Claim 15 A display device according to claim 14, wherein the above-mentioned barrier pattern includes a first barrier pattern disposed between the second electrode and the second pixel defining film. Claim 16 A display device according to claim 14, wherein the second pixel defining film has a fourth opening that overlaps with the first light-emitting region. Claim 17 A display device according to claim 16, characterized in that the above bulkhead pattern includes a second bulkhead pattern disposed within the fourth opening. Claim 18 A display device according to claim 14, wherein the above-mentioned partition pattern comprises a plurality of first partitions that extend in a first direction and are arranged in a second direction perpendicular to the first direction. Claim 19 A display device according to claim 18, wherein the above-mentioned partition pattern further comprises a plurality of second partitions that extend in the second direction and are arranged in the first direction. Claim 20 A display device according to claim 13, further comprising a color filter layer disposed on the fourth electrode and overlapping with the first light-emitting region and the second light-emitting region.

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