Light emitting display device

Abstract

To provide a light emitting display device capable of preventing a leakage current between adjacent sub-pixels.SOLUTION: And a bank covering an edge of the first electrode and having a trench formed along a boundary between the sub-pixels adjacent to each other, wherein the trench includes a first corner groove formed in a second diagonal direction at a boundary between a corner portion protruding in a first diagonal direction of a first sub-pixel and an inclined corner portion of a third sub-pixel adjacent to the first sub-pixel, and a second corner groove formed at a boundary between the protruding corner portion of the first sub-pixel and an inclined corner portion of each of second and fourth sub-pixels adjacent to both sides of the protruding corner portion of the first sub-pixel.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a light-emitting display device. [Background technology]

[0002] 2. Description of the Related Art Recently, flat panel displays, which have excellent properties such as thinness, light weight, and low power consumption, have been widely developed and are being applied in various fields.

[0003] Among flat panel display devices, light emitting display devices use light emitting elements that emit light by injecting charges into a light emitting layer formed between a negative electrode, which is an electron injection electrode, and a positive electrode, which is a hole injection electrode, forming pairs of electrons and holes, which then disappear.

[0004] In such a light emitting display device, the light emitting layer is formed on the entire surface of the substrate through a deposition process without using a separate mask.

[0005] In this case, adjacent sub-pixels may be electrically connected through the light-emitting layer, causing leakage current to flow between the adjacent sub-pixels. The likelihood of this leakage current occurring increases as the resolution of the display device increases. The occurrence of this leakage current results in a degradation of the image quality of the display device. Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION An object of the present invention is to provide a method for preventing leakage current between adjacent sub-pixels. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a substrate on which a plurality of subpixels arranged in a matrix form along a plurality of row lines and column lines are defined; a first electrode formed on the substrate for each of the subpixels; a bank covering an edge of the first electrode and having a trench formed along a boundary between adjacent subpixels; a light-emitting layer positioned on the first electrode and separated for each of the subpixels by the trench; and a second electrode formed on the light-emitting layer of the plurality of subpixels, wherein the subpixels have a protruding quadrangular corner portion and three inclined corner portions, and the plurality of subpixels include first and second subpixels adjacent to each other in a row direction and fourth and third subpixels adjacent to each of the first and second subpixels in a column direction, and the trench is connected to the corner portion protruding in a first diagonal direction of the first subpixel. a first corner groove in a second diagonal direction formed at a boundary between the protruding corner of the first subpixel and the inclined corners of the second and fourth subpixels adjacent thereto; second corner grooves in the first diagonal direction formed at a boundary between the protruding corner of the first subpixel and the inclined corners of the second and fourth subpixels adjacent thereto on both sides, the first corner groove being connected to the first corner groove by first and second contacts, respectively; first side grooves in the column direction formed at the boundary between the first and second subpixels and the boundary between the third and fourth subpixels, respectively; and second side grooves in the row direction formed at the boundary between the second and third subpixels and the boundary between the first and fourth subpixels, respectively, wherein the second side groove formed at the boundary between the second and third subpixels is connected to the first contact and the first side groove formed at the boundary between the third and fourth subpixels is connected to the second contact.

[0008] Here, a first side groove formed at the boundary between the first and second sub-pixels may be connected to a second corner groove connected to the first contact, and a second side groove formed at the boundary between the first and fourth sub-pixels may be connected to a second corner groove connected to the second contact.

[0009] The protruding corner portions of the plurality of sub-pixels may protrude in the same direction.

[0010] The protruding directions of the protruding corner portions of the sub-pixels arranged in each of the plurality of row lines may alternate in the first and second diagonal directions.

[0011] The protruding directions of the protruding corner portions of the sub-pixels arranged on each of the plurality of column lines may alternate in the first and second diagonal directions.

[0012] The protruding corner may be a regular square.

[0013] The protruding corner portion of the subpixel is a regular square formed by combining four right-angled isosceles triangular portions, and by combining three of the right-angled isosceles triangular portions corresponding to the three inclined corner portions of the subpixel, a regular square subpixel can be formed.

[0014] The subpixel may further include a thin film transistor located at the corner portion; and at least one insulating layer located between the thin film transistor and the first electrode and having a contact hole, wherein the first electrode and the thin film transistor may be connected at the corner portion through the contact hole.

[0015] The trench may extend into the at least one insulating layer.

[0016] The at least one insulating layer may include a first insulating layer, a second insulating layer on the first insulating layer, and a third insulating layer on the second insulating layer, and the plurality of subpixels may include red subpixels, green subpixels, and blue subpixels, and the red subpixels may have a first reflector interposed between the first insulating layer and the second insulating layer, the green subpixels may have a second reflector interposed between the second insulating layer and the third insulating layer, and the blue subpixels may have a third reflector interposed between the third insulating layer and the first electrode.

[0017] The light-emitting layer is capable of emitting white light.

[0018] In another aspect, the present invention provides a pixel array including: a substrate on which a number of subpixels are defined and arranged in a matrix along a number of row lines and column lines; a first electrode formed on the substrate for each of the subpixels; a bank covering an edge of the first electrode and having a trench formed along a boundary between adjacent subpixels; a light-emitting layer positioned on the first electrode and separated into subpixels by the trench; and a second electrode formed on the light-emitting layer of the plurality of subpixels, the trenches being first trench lines along a boundary between adjacent column lines; and a second trench line along a boundary between adjacent row lines. the first trench line includes first and second corner grooves connected between a first side groove in a column direction and an adjacent first side groove, forming an isosceles portion protruding to one side in a row direction, having second and first diagonal directions, respectively, and connected to each other at a first junction; the second trench line includes second side grooves connected between a second side groove in the row direction and an adjacent second side groove, forming an isosceles portion protruding to one side in a column direction, and having the first and second corner grooves connected to each other at a second junction; and the protruding isosceles portion of the first trench line and the protruding isosceles portion of the second trench line share the first corner groove.

[0019] The second side groove may be connected to the first contact point, and the first side groove may be connected to the second contact point.

[0020] The protruding directions of the plurality of protruding isosceles portions located on the first trench line may be the same, and the protruding directions of the plurality of protruding isosceles portions located on the second trench line may be the same.

[0021] The protruding directions of the plurality of protruding isosceles portions located on the second trench line may alternate on both sides of the column direction, and the protruding directions of the plurality of protruding isosceles portions located on the first trench line may be the same.

[0022] The protruding directions of the plurality of protruding isosceles portions located on the first trench line may alternate on both sides of the row direction, and the protruding directions of the plurality of protruding isosceles portions located on the second trench line may be the same.

[0023] The protruding isosceles portion of the first trench line may be a right-angled isosceles portion, and the protruding isosceles portion of the second trench line may be a right-angled isosceles portion.

[0024] The subpixel may further include a thin film transistor located at a corner portion of the subpixel surrounded by the protruding isosceles portion of the first trench line and the protruding isosceles portion of the second trench line; and at least one insulating layer located between the thin film transistor and the first electrode and having a contact hole, wherein the first electrode and the thin film transistor may be connected at the corner portion through the contact hole.

[0025] The trench may extend into the at least one insulating layer.

[0026] The at least one insulating layer may include a first insulating layer, a second insulating layer on the first insulating layer, and a third insulating layer on the second insulating layer, and the plurality of subpixels may include red subpixels, green subpixels, and blue subpixels, and the red subpixels may have a first reflector interposed between the first insulating layer and the second insulating layer, the green subpixels may have a second reflector interposed between the second insulating layer and the third insulating layer, and the blue subpixels may have a third reflector interposed between the third insulating layer and the first electrode. [Effects of the Invention]

[0027] In the present invention, trenches are formed along the boundaries of subpixels to physically separate the light-emitting layers of adjacent subpixels, thereby preventing leakage current from flowing through the light-emitting layers between adjacent subpixels.

[0028] In the present invention, the right-angle corners of a square subpixel are modified to form a square subpixel with three chamfered corners and one protruding corner. Accordingly, the trenches formed at the boundaries between adjacent subpixels can be shaped like a "Y" with crossing angles of 90 degrees, 135 degrees, and 135 degrees. A trench of a desired width can be formed through a mask process using an OPC design, allowing the emission layers of adjacent subpixels to be separated by the trenches.

[0029] In addition, in the present invention, sub-pixels are used that have corners that are modified based on a regular square, so that a high level of aperture ratio that is substantially the same as or very close to that of a regular square can be achieved.

[0030] Furthermore, in the present invention, since sub-pixels are used that are formed by modifying the corners of a regular square, various pixel structures including an RGBW structure, a pentile structure, and a delta structure can be realized.

[0031] In addition, in the present invention, the protruding corner portions may be alternately arranged in opposite diagonal directions on row lines or column lines, which can prevent sub-pixel patterns in the same direction from being repeated, thereby improving the phenomenon of the same pattern being seen. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a plan view schematically illustrating a light emitting display device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along the line II-II′ in FIG. 1. [Figure 3] 1 is a diagram schematically illustrating a shape of a sub-pixel of a light emitting display device according to a first embodiment of the present invention. [Figure 4]2 is a diagram illustrating four adjacent sub-pixels and trenches formed at their boundaries in a light emitting display device according to a first embodiment of the present invention; [Figure 5] 5 is an enlarged view of a first corner portion and its surroundings of a protruding shape of the sub-pixel of FIG. 4. [Figure 6] 10 is a graph comparing aperture ratios of rectangular sub-pixels and square sub-pixels; [Figure 7] FIG. 10 is a plan view schematically illustrating a light emitting display device according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a plan view schematically illustrating a light emitting display device according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] The advantages and features of the present invention, as well as methods for achieving them, will become more apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various different forms. However, the present invention is only defined by the scope of the claims, and the present invention is not limited to the embodiments disclosed below.

[0034] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are merely examples, and the present invention is not limited to the illustrated matters. The same reference numerals refer to the same components throughout the specification.

[0035] Furthermore, in describing the present invention, if it is determined that a detailed description of related prior art may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When words such as "comprise," "have," and "belong to" are used in this specification, other parts may be added unless "only" is used. When a component is expressed in the singular, it also includes a plural unless otherwise explicitly stated.

[0036] When interpreting elements, they are interpreted as including a margin of error even if there is no other explicit description.

[0037] When describing a positional relationship, for example, when the positional relationship between two parts is described using "above," "on top of," "below," or "beside," one or more other parts may be located between the two parts as long as "immediately" or "directly" is not used.

[0038] When describing a temporal relationship, for example, when the temporal sequence is explained using "after," "following," "next," or "before," it can also include cases where the sequence is not consecutive, since "immediately" or "directly" is not used.

[0039] Although terms such as "first," "second," etc. are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, a first component referred to below may be a second component within the technical concept of the present invention.

[0040] The features of the various embodiments of the present invention may be partially or fully combined or combined with each other, and various technical interlocking and driving mechanisms may be possible. Each embodiment may be implemented independently of the others, or may be implemented together in a correlated manner.

[0041] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Meanwhile, in the following embodiments, the same or similar components are denoted by the same or similar drawing numbers, and detailed descriptions thereof may be omitted.

[0042] <First Example>

[0043] Fig. 1 is a plan view schematically illustrating a light emitting display device according to a first embodiment of the present invention, and Fig. 2 is a cross-sectional view taken along line II-II' in Fig. 1, illustrating a cross-sectional structure of a sub-pixel.

[0044] 1, the direction in which row lines extend is referred to as row direction (or horizontal direction) LD1, and the direction in which column lines extend that intersects with (or is perpendicular to) row direction LD1 is referred to as column direction LD2. Of the two diagonal directions between row direction LD1 and column direction LD2, the direction toward the upper left and lower right is referred to as first diagonal direction DD1, and the direction toward the lower left and upper right is referred to as second diagonal direction DD2.

[0045] 1 and 2, a light emitting display device 10 according to this embodiment may have a plurality of sub-pixels SP arranged in a matrix along a plurality of row lines and column lines in a display area for displaying an image.

[0046] The plurality of sub-pixels SP may include R, G, and B sub-pixels SP that respectively display first, second, and third colors, e.g., red, green, and blue, constituting a unit pixel that displays a color image. Alternatively, the plurality of sub-pixels SP may further include a sub-pixel that displays white.

[0047] In this embodiment, for convenience of explanation, an example in which R, G, and B sub-pixels SP are arranged will be given.

[0048] The sub-pixel SP may include a light emitting diode OD as a light emitting element, a plurality of thin film transistors TR as driving elements for driving the light emitting diode OD, and at least one storage capacitor.

[0049] Each sub-pixel SP may include a first region A1 in which a light emitting diode OD is disposed and a second region A2 in which the light emitting diode OD and the thin film transistor TR are connected. In one embodiment, the first region A1 is a region having a plurality of chamfered corners, and the second region A2 is a region extending in a diagonal direction (e.g., DD1) from the first region A1 in the plan view of the light emitting display device of FIG.

[0050] The configuration of such a sub-pixel SP will be considered in detail with reference to FIG.

[0051] 2, the light emitting display device 10 of this embodiment may be a top emission type display device, that is, configured to emit light toward the top of the substrate 101. Of course, the light emitting display device 10 of this embodiment may also be a bottom emission type display device.

[0052] An insulating substrate such as a glass substrate or a plastic substrate may be used as the substrate 101. Alternatively, a silicon substrate (or silicon wafer) made of single-crystal crystalline silicon that functions as a semiconductor may be used as the substrate 101. In this case, there is an advantage that a small display device requiring high resolution can be effectively implemented.

[0053] In this embodiment, for the sake of convenience, an example will be given in which an insulating substrate is used.

[0054] A plurality of thin film transistors TR may be formed in each sub-pixel SP on the substrate 101. In this embodiment, for the sake of convenience, one thin film transistor TR connected to a light emitting diode OD is illustrated in each sub-pixel SP. The thin film transistor TR may be, but is not limited to, a driving thin film transistor.

[0055] Although not specifically shown, the thin film transistor TR may include a semiconductor layer, a gate insulating film, a gate electrode, a source electrode, and a drain electrode. Here, the thin film transistor TR may be a so-called bottom-gate thin film transistor in which the gate electrode is located below the semiconductor layer, or a so-called top-gate thin film transistor in which the gate electrode is located above the semiconductor layer.

[0056] On the other hand, when a semiconductor substrate is used as the substrate 101, an active region functioning as a semiconductor layer can be formed inside the semiconductor substrate.

[0057] At least one insulating layer may be formed on the thin film transistor TR. For ease of explanation, this embodiment will exemplify a case in which three insulating layers, a first insulating layer 111 to a third insulating layer 113, are formed.

[0058] The first insulating layer 111 may be formed on substantially the entire surface of the substrate 101 to cover the thin film transistor TR. The first insulating layer 111 may be made of an organic insulating material or an inorganic insulating material.

[0059] A first reflector 121 may be formed on the first insulating layer 111 within the R sub-pixel SP.

[0060] A second insulating layer 112 may be formed on the first insulating layer 111 on which the first reflector 121 is formed, substantially over the entire surface of the substrate 101. The second insulating layer 112 may be made of an organic insulating material or an inorganic insulating material.

[0061] A second reflector 122 may be formed on the second insulating layer 112 within the G sub-pixel SP.

[0062] A third insulating layer 113 may be formed on the second insulating layer 112 on which the second reflector 122 is formed, substantially over the entire surface of the substrate 101. The third insulating layer 113 may be made of an organic insulating material or an inorganic insulating material.

[0063] A third reflector 123 may be formed on the third insulating layer 113 within the B subpixel SP.

[0064] Meanwhile, the first to third insulating layers 111 to 113 may have formed therein a contact hole CH exposing one electrode of the thin film transistor TR, for example, a drain electrode.

[0065] The first to third reflectors 121 to 123 may be made of various metal materials having reflective properties, such as Al, Ag, Ti, and APC (Al-Pd-Cu) alloy, but are not limited thereto.

[0066] Each of the first to third reflectors 121 to 123 can function to reflect, in an upward direction, light generated by an LED OD located above the corresponding sub-pixel SP and traveling downward.

[0067] In this regard, the first to third reflectors 121 to 123 may be formed to correspond to the first area A1 of the corresponding subpixel. For example, the first to third reflectors 121 to 123 may be formed to be disposed to correspond to the light-emitting area EA in the first area A1 of the corresponding subpixel.

[0068] A first electrode 140 of the light emitting diode OD for each sub-pixel SP may be formed on the substrate 101 on which the third reflector 123 is formed. The first electrode 140 may be formed in a patterned form for each sub-pixel SP.

[0069] Here, the first electrode 140 may be formed in both the first area A1 and the second area A2 of each sub-pixel SP.

[0070] The first electrode 140 may be formed of a transparent conductive material such as ITO, IZO, or ITZO.

[0071] The first electrodes 140 formed in the R subpixel SP(R) and the G subpixel SP(G) may be formed on the third insulating layer 113. The first electrode 140 formed in the B subpixel SP(B) may be formed on the third reflector 123 of the subpixel SP(B). As another example, an insulating layer may be formed on substantially the entire surface of the substrate on the third reflector 123, and the first electrodes 140 for each subpixel SP may be formed on the insulating layer.

[0072] The first electrode 140 formed in each subpixel SP may be connected to the drain electrode of the thin film transistor TR of the corresponding subpixel SP through a contact hole CH. As another example, at least one conductive connection pattern (or metal pattern) may be located between the first electrode 140 and the thin film transistor TR, electrically connecting the first electrode 140 and the thin film transistor TR. In this regard, for example, a connection pattern formed in the same layer and using the same material as at least one of the first to third reflectors 121 to 123 may be provided, and the first electrode 140 and the thin film transistor TR may be connected to each other via this connection pattern.

[0073] A bank (or partition) 143 surrounding each sub-pixel SP may be formed along the edge of each sub-pixel SP on the first electrode 140. The bank 143 may be made of an inorganic insulating material or an organic insulating material.

[0074] Such a bank 143 may have an opening exposing the first electrode 140 of each subpixel SP and may be configured to cover the edge of the first electrode 140. The opening of such a bank 143 may define (demarcate) an emitting area EA in the first area A1, where light is substantially generated in the subpixel SP.

[0075] The bank 143 may be formed to cover the second region A2 of each sub-pixel SP.

[0076] In this way, the portion of the sub-pixel SP where the bank 143 is located corresponds to a substantially non-light-emitting region.

[0077] Meanwhile, in the light emitting display device 10 of this embodiment, trenches TC may be formed in the bank 143. The trenches TC may be formed along the boundaries of the sub-pixels SP to surround the sub-pixels SP, thereby dividing the sub-pixels SP.

[0078] In other words, the trenches TC can be formed at the boundaries between adjacent sub-pixels SP to physically separate the sub-pixels SP from each other.

[0079] Furthermore, the trench TC may extend into the insulating layer located below the bank 143. For example, the trench TC may be formed in at least one of the first to third insulating layers 111 to 113, including the third insulating layer 113. In this embodiment, the case where the trench TC is formed in the first to third insulating layers 111 to 113 will be exemplified.

[0080] An emitting layer 145 may be formed on the bank 143 and on the first electrode 140 exposed through the opening. The emitting layer 145 may be, for example, an organic emitting layer formed using an organic material. The emitting layer 145 may be formed as a multi-layer structure including a emitting material layer.

[0081] The light-emitting layer 145 may be separated (or interrupted or divided) into subpixels SP by trenches TC surrounding each subpixel SP and formed in a pattern corresponding to each subpixel SP. Here, the light-emitting layer 145 may have a single-layer stack structure or a multi-layer stack structure. If the light-emitting layer 145 has a single-layer stack structure, it may be completely separated into subpixels by the trenches TC. If the light-emitting layer 145 has a multi-layer stack structure, for example, a two-layer stack structure of first and second stacks, the charge generation layer between the lower first stack and the first and second stacks may be completely separated by the trenches TC, and the upper second stack may be partially or completely separated.

[0082] In this regard, for example, the light emitting layer material for forming the light emitting layer 145 is deposited through a deposition process substantially over the entire display area of ​​the substrate 101. In this case, the light emitting layer material may not be deposited in the trench TC portion, but may be deposited in a form surrounding the inner surface of the trench TC.

[0083] Accordingly, since the light emitting layer material has a disconnected shape at the trench TC, the light emitting layers 145 are separated from each other at the boundary of the trench TC and formed in a pattern shape in each sub-pixel SP, and the light emitting layer 145 may be formed over the entirety of each sub-pixel SP. At this time, although not specifically shown, the light emitting layer material may remain in the form of a deposit on the bottom of the trench TC.

[0084] Meanwhile, since the light-emitting layer 145 may be formed substantially along the inner surface of the trench TC on the side of the corresponding sub-pixel SP, the distance between adjacent light-emitting layers 145 may be substantially smaller than the width of the trench TC.

[0085] The light-emitting layer 145 may be, for example, a white light-emitting layer that emits white light, so that all the sub-pixels SP can emit the same white light.

[0086] As described above, in this embodiment, the trenches TC are formed along the boundaries of the sub-pixels SP, so that the light-emitting layers 145 between adjacent sub-pixels SP can be physically separated from each other, thereby preventing leakage current from occurring through the light-emitting layers 145 between adjacent sub-pixels SP.

[0087] A second electrode 150 may be formed on the light emitting layer 145 over substantially the entire surface of the substrate 101 .

[0088] In this regard, as described above, trenches TC exist at the boundaries between the subpixels SP, and the distance between the light-emitting layers 145 in the trenches TC is narrower than the width of the trenches TC. Accordingly, the second electrode 150 can be formed without interruption in the trenches TC, and as a result, the second electrode 150 can be formed continuously along all the subpixels SP.

[0089] The second electrode 150 may be formed of a metallic material having semi-transparent properties, such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag) (Mg:Ag).

[0090] In this manner, in each sub-pixel SP, the corresponding reflectors 121, 122, and 123 and the second electrode 150 are located above and below the light-emitting layer 145, thereby realizing a micro-cavity structure.

[0091] In this regard, since the R sub-pixel SP(R), the G sub-pixel SP(G), and the B sub-pixel SP(B) emit light of different colors, i.e., different wavelengths, they may have different cavity thicknesses (or resonance distances) (i.e., distances between the corresponding reflectors and the second electrodes).

[0092] In contrast, the R, G, and B sub-pixels SP that display red, green, and blue have cavity thicknesses proportional to the wavelengths (or half wavelengths) of the corresponding colors, and the cavity thickness of each sub-pixel SP can be matched to an integer multiple of the half wavelength of the corresponding color.

[0093] In this regard, the red R subpixel SP(R), which has the largest wavelength, can have the corresponding first cavity thickness by arranging the first reflector 121 closest to the substrate, the green G subpixel SP(G), which has the intermediate wavelength, can have the corresponding second cavity thickness by arranging the second reflector 122 higher than the first reflector 121, and the blue B subpixel SP(B), which has the smallest wavelength, can have the corresponding third cavity thickness by arranging the third reflector 123 at the highest position.

[0094] Thus, by utilizing the microcavity structure, color purity and light efficiency can be improved.

[0095] Furthermore, since the positions of the corresponding reflectors 121, 122, and 123 are differentiated for the sub-pixels SP of different colors to achieve the corresponding microcavity thicknesses, the light emitting diodes OD of the sub-pixels SP can have substantially the same thickness and the light emitting diodes OD can have substantially the same characteristics.

[0096] A sealing layer 160 for encapsulating the substrate 101 on which the second electrode 150 is formed may be formed along the entire surface of the substrate 101. The sealing layer 160 may improve reliability by blocking the penetration of moisture or oxygen from the outside.

[0097] Furthermore, the sealing layer 160 can planarize the substrate 101 on which the second electrode 150 is formed.

[0098] The sealing layer 160 may be formed in a single layer structure or a multi-layer structure using at least one of an inorganic insulating material and an organic insulating material.

[0099] A color filter layer 170 may be formed on the sealing layer 160 to implement a corresponding color corresponding to each sub-pixel SP.

[0100] In contrast, the color filter layer 170 may include R, G, and B color filter patterns 170r, 170g, and 170b for generating red, green, and blue colors corresponding to the R, G, and B sub-pixels SP, respectively.

[0101] As a result, the R, G, and B sub-pixels SP can display the corresponding colors with higher purity.

[0102] Meanwhile, although not specifically shown, a black matrix may be formed on the sealing layer 160 between adjacent color filter patterns.

[0103] As described above, in the light emitting display device 10 of this embodiment, the trenches TC can be formed along the boundaries of the sub-pixels SP to physically separate the light emitting layers 145 for each sub-pixel SP.

[0104] Such trenches TC must be formed to a certain width or less in order to separate the deposition material for each subpixel SP, and are preferably formed to a width of, for example, approximately 200 nm or less.

[0105] The fine trenches TC of nanometer size are formed through a mask process, and the trenches TC can be formed by exposing and etching through an exposure mask having a pattern corresponding to the shape of the trenches TC.

[0106] On the other hand, due to the influence of diffraction during the exposure process, the pattern shape is not transferred as is, and the shape of the trench TC is distorted. To improve this, an OPC (optical proximity correction) design is used to calculate the deformation value in advance and correct the pattern.

[0107] Generally, the sub-pixels SP are formed in a rectangular shape and are repeatedly arranged in the row and column directions. In this case, a cross-shaped trench is formed at the location where four adjacent sub-pixels in the row and column directions are gathered (or contacted).

[0108] However, since the cross-shaped trench has four corners with cross angles of 90 degrees, there is a limit to the application of OPC design, and therefore it is very difficult to achieve a desired width.

[0109] For this reason, in this embodiment, sub-pixels SP and trenches TC formed along the boundaries thereof to define the shape thereof are configured so that the OPC design can be applied.

[0110] The structure and arrangement of such subpixels SP and trenches TC will be described in more detail with further reference to FIGS. 3 to 5 in addition to FIG.

[0111] Figure 3 is a diagram illustrating a schematic configuration of a subpixel of an organic light emitting display device according to a first embodiment of the present invention. Figure 4 is a diagram illustrating four adjacent subpixels and trenches formed at their boundaries in an organic light emitting display device according to a first embodiment of the present invention. Figure 5 is an enlarged diagram of a first corner portion and its surroundings of a protruding shape of the subpixel of Figure 4.

[0112] Meanwhile, for convenience of explanation, in the subpixel SP of this embodiment, the right edge portion (or corner portion or edge portion) is referred to as the first side portion, the opposite left edge portion is referred to as the third side portion, the lower edge portion is referred to as the second side portion, and the opposite upper edge portion is referred to as the fourth side portion. That is, the right, lower, left, and upper edge portions located in the clockwise direction are referred to as the first, second, third, and fourth side portions.

[0113] First, referring to FIG. 3 regarding the shape of the sub-pixel SP of this embodiment, the sub-pixel SP of this embodiment may be configured based on the sub-pixel SPo having a square shape.

[0114] In contrast, a square sub-pixel SPo is shown on the left side of FIG. 3, and a sub-pixel SP of this embodiment, which is a modification of this square sub-pixel SP, is shown on the right side.

[0115] The subpixel SPo has a first corner a1 and a third corner a3 of a right-angled isosceles triangle with right angles (i.e., 90 degrees) located on opposite sides, the lower right and upper left, of the first diagonal direction DD1, and a second corner a2 and a fourth corner a4 of a right-angled isosceles triangle with right angles located on opposite sides, the lower left and upper right, of the second diagonal direction DD2.

[0116] For such a regular square subpixel SPo, the three corner portions, for example, the second, third, and fourth corner portions a2, a3, and a4, can be cut out and placed to the right, diagonally, and below the first corner portion a1.

[0117] In this way, the sub-pixel SP of this embodiment can be formed as shown in the right part of Fig. 3. Such a sub-pixel SP of this embodiment can be seen as being formed in the shape of a table tennis racket with a handle on one side, for example, the lower right side, in the first diagonal direction DD1.

[0118] In contrast, the subpixel SP of this embodiment has three corners, namely the second, third and fourth corners C2, C3 and C4, each of which has a shape in which a right-angled isosceles triangle portion is cut off and can have a chamfered shape (or trapezoid).

[0119] In this regard, a second corner C2 located between a lower second side portion and a left third side portion adjacent to each other in a subpixel SP may have a chamfered shape with a boundary line (or boundary surface) inclined in the first diagonal direction DD1. A third corner C3 located between a left third side portion and an upper fourth side portion adjacent to each other may have a chamfered shape with a boundary line inclined in the second diagonal direction DD2. A fourth corner C4 located between an upper fourth side portion and a right first side portion adjacent to each other may have a chamfered shape with a boundary line inclined in the first diagonal direction DD1.

[0120] The first corner portion C1, which is the remaining corner portion of the subpixel SP and is located between the first and second side portions adjacent to each other, may have a protruding shape of a regular square formed by combining four right-angled isosceles triangles.

[0121] In contrast, the first corner portion C1 has a substantially square shape that complements the deformed chamfered shapes of the second, third, and fourth corner portions C2, C3, and C4, and therefore can be said to have three boundary lines that correspond to (or are substantially identical to) the boundary lines of the second, third, and fourth corner portions C2, C3, and C4.

[0122] That is, the first corner portion C1 may have a boundary line that corresponds to the boundary line of the third corner portion C3 and is located forward in the protruding direction (e.g., forward of a3 in the drawings) and inclined in the second diagonal direction DD2, a boundary line that corresponds to the boundary line of the second corner portion C2 and is located on one side of the first corner portion C1 (e.g., on one side of a2 in the drawings) and inclined in the first diagonal direction DD1, and a boundary line that corresponds to the boundary line of the fourth corner portion C4 and is located on the other side of the first corner portion C1 (e.g., on one side of a4 in the drawings) and inclined in the first diagonal direction DD1.

[0123] As described above, in the subpixel SP of this embodiment, one of the four corner portions, the first corner portion C1, has a shape that protrudes to one side in the first diagonal direction DD1, and the remaining second, third, and fourth corner portions C2, C3, and C4 may have chamfered shapes that are inclined in the corresponding diagonal direction.

[0124] According to the shape of the sub-pixel SP, the sub-pixel SP can be divided into a first region A1 having second, third and fourth corner portions C2, C3 and C4 and a second region A2 having the first corner portion C1.

[0125] In this regard, the area occupied by the first corner portion C1 of the sub-pixel SP may be substantially defined as the second area A2, and the second area A2 may be configured in the shape of a regular square on one diagonal side of the sub-pixel SP.

[0126] The first region A1 of the subpixel SP may have four substantially beveled chamfered corners, where the first region A1 has the second, third, and fourth corners C2, C3, and C4 of the subpixel SP as its three outer corners, and the beveled corner located at the boundary with the second region A2 as its one inner corner.

[0127] The sub-pixels SP having this structure may be repeatedly arranged in a row direction LD1 and a column direction LD2 in a display area to form a matrix.

[0128] The arrangement of the sub-pixels SP and the structure and arrangement of the trenches TC will be considered in detail with reference to FIGS.

[0129] A trench TC may be formed at the boundary of each sub-pixel SP, i.e., at the boundary between adjacent sub-pixels SP, thereby separating each sub-pixel SP from the adjacent sub-pixels SP.

[0130] In this embodiment, the sub-pixels SP may be arranged such that all of their protruding corners have the same direction (or the same orientation). In other words, the protruding corner of the sub-pixel SP may be a first corner C1 located on the lower right side of the first diagonal direction DD1.

[0131] In this case, the remaining corners of the tilted shape of each subpixel SP, i.e., the second, third and fourth corners C2, C3 and C4, may be arranged, for example, along a clockwise direction, and may be located at the bottom left of the second diagonal direction DD2, the top left of the first diagonal direction DD1 and the top right of the second diagonal direction DD2, respectively.

[0132] Of course, the first corner portion C1 and corner portions at other positions may be configured to protrude.

[0133] In this way, the first corner portion C1 of each subpixel SP may have a regular square shape formed by combining four right-angled isosceles triangles, as described above with reference to Figure 3. Accordingly, the first corner portion C1 may have a shape that fits like a puzzle piece into a space (or area) surrounded by the tilted second, third, and fourth corner portions C2, C3, and C4 of the adjacent subpixels SP.

[0134] In contrast, for example, the first corner portion C1 of the first subpixel SP1 may be located in a recessed space surrounded by the second corner portion C2 of the second subpixel SP2, the third corner portion C3 of the third subpixel SP3, and the fourth corner portion C4 of the fourth subpixel SP4.

[0135] From another perspective, the first corner portion C1 of the first subpixel SP1 can be said to be located in an internal space defined by the inner corner portions of the first region A1 of the adjacent first subpixel SP1 and the second, third, and fourth corner portions C2, C3, and C4 of the first region A1 of the second, third, and fourth subpixels SP2, SP3, and SP4.

[0136] In this way, the first corner portion C1 of the first sub-pixel SP1 can be seen as having a protruding regular square shape by occupying three isosceles triangular portions that are left when the three corner portions C2, C3, and C4 of the three adjacent sub-pixels SP2, SP3, and SP4 are transformed into chamfer shapes.

[0137] The first corner portion C1 is an edge portion corresponding to (butting against) the second, third, and fourth corner portions C2, C3, and C4 of the second, third, and fourth sub-pixels SP2, SP3, and SP4, respectively, and may have an in-corner side portion.

[0138] In contrast, for example, the first corner portion C1 may have a first inner corner side portion facing the third corner portion C3 of the third subpixel SP3 to form a boundary line in the second diagonal direction DD2, a second inner corner side portion facing the second corner portion C2 of the second subpixel SP2 to form a boundary line in the first diagonal direction DD1, and a third inner corner side portion facing the fourth corner portion C4 of the fourth subpixel SP4 to form a boundary line in the first diagonal direction DD1.

[0139] Meanwhile, a boundary line in the column direction LD2 may be formed between the first and second subpixels SP1 and SP2 adjacent in the row direction LD1 (more specifically, between their facing first and third side portions) and between the third and fourth subpixels SP3 and SP4 (more specifically, between their facing first and third side portions).

[0140] Furthermore, a boundary line in the row direction LD1 may be formed between the first and fourth subpixels SP1 and SP4 adjacent to each other in the column direction LD2 (more specifically, between their opposing second and fourth side portions) and between the second and third subpixels SP2 and SP3 (more specifically, between their opposing second and fourth side portions).

[0141] According to the above-described structure and arrangement of the sub-pixels SP, the boundary line (or the boundary line between adjacent column lines) located on one side, for example, the right side, of each column line sub-pixel SP may have a shape that protrudes to the right along the first corner C1 of the column line. That is, the boundary line of the column line may be composed of a portion that extends in the column direction LD2 and a portion that protrudes in the shape of a right-angled isosceles connected therebetween.

[0142] A boundary line (or a boundary line between adjacent row lines) located on one side, for example, the lower side, of each row line sub-pixel SP may have a shape that protrudes downward along the row line at a first corner C1. That is, the boundary line of the row line may be composed of a part that extends in the row direction LD1 and a part that protrudes in a right-angled isosceles shape connected therebetween.

[0143] At this time, the row line boundary line and the column line boundary line can share the front boundary portion of the first corner portion C1, that is, the boundary portion in the second diagonal direction DD2.

[0144] As a result of the crossing of the partially protruding column line boundary line and the row line boundary line, a sub-pixel SP surrounded by these boundary line boundaries can be defined.

[0145] The trench TC formed along the boundary of the sub-pixel SP having the above-described structure and arrangement so as to surround it may include a side groove TCS and a corner groove TCC.

[0146] The side grooves TCS can be located at the outer boundaries of the side portions of the sub-pixel SP, and the corner grooves TCC can be located at the outer boundaries of the corner portions of the sub-pixel SP.

[0147] In this regard, the side grooves TCS can be located at the boundaries of both sides, i.e., the right and left side portions, of the subpixel SP in the row direction LD1, and can be located at the boundaries of both sides, i.e., the lower and upper side portions, of the subpixel SP in the column direction LD2.

[0148] In other words, the side grooves TCS can be located at the boundary between the side portions of the sub-pixels SP adjacent in the row direction LD1, and can be located at the boundary between the side portions of the sub-pixels SP adjacent in the column direction LD2.

[0149] Here, for ease of explanation, the side groove TCS located on the boundary line between both side portions in the row direction LD1 in each subpixel SP is referred to as the first side groove TCS1, and the side groove TCS located on the boundary line between both side portions in the column direction LD2 is referred to as the second side groove TCS2.

[0150] In contrast, for example, first side grooves TCS1 extending in the column direction LD2 may be formed at the boundary lines of the right and left sides of each of the first to fourth subpixels SP1 to SP4. That is, the first side grooves TCS1 may be interposed between the first and second subpixels SP1 and SP2 and between the third and fourth subpixels SP3 and SP4 adjacent to each other in the row direction LD1.

[0151] Second side grooves TCS2 extending in the row direction LD1 may be formed at the boundaries of the lower and upper sides of each of the first to fourth sub-pixels SP1 to SP4. That is, the second side grooves TCS2 may be interposed between the first and fourth sub-pixels SP1 and SP4 and between the second and third sub-pixels SP2 and SP3 adjacent to each other in the column direction LD2.

[0152] The corner grooves TCC may be located on the boundary lines between the first and third corner portions C1 and C3 on both sides of the first diagonal direction DD1 of the subpixel SP, and may be located on the boundary lines between the second and fourth corner portions C2 and C4 on both sides of the second diagonal direction DD2.

[0153] In contrast, the corner groove TCC can be located on the boundary line between the corner portions of adjacent subpixels SP in the first diagonal direction DD1, and can also be located on the boundary line between the corner portions of adjacent subpixels SP in the row direction LD1, and can also be located on the boundary line between the corner portions of adjacent subpixels SP in the column direction LD2.

[0154] For ease of explanation, the corner groove TCC located on the boundary between the first and third corner portions C1 and C3 in the first diagonal direction DD1 and extending in the second diagonal direction DD2 is referred to as the first corner groove TCC1, and the corner groove TCC located between the first and second corner portions C1 and C2 and between the first and fourth corner portions C1 and C4 in the second diagonal direction DD2 is referred to as the second corner groove TCC2.

[0155] In each subpixel SP, the second corner groove TCC2 in the first diagonal direction DD1 may be disposed on the inclined boundary line of the corresponding chamfered second and fourth corner portions C2 and C4. For example, a second corner groove TCC2 may be disposed between the chamfered second corner portion C2 of the second subpixel SP2 and the first corner portion C1 of the first subpixel SP1, and another second corner groove TCC2 may be disposed between the chamfered fourth corner portion C4 of the fourth subpixel SP4 and the first corner portion C1 of the first subpixel SP1. In addition, the first corner groove TCC1 may be disposed on the inclined boundary line of the corresponding chamfered third corner portion C3.

[0156] Meanwhile, the first corner portion C1 of each subpixel SP may have a boundary line in the second diagonal direction DD2 and boundary lines in the first diagonal direction DD1 that are perpendicular to both ends of the boundary line in the second diagonal direction DD2 due to its protruding rectangular shape. Accordingly, a first corner groove TCC1 in the second diagonal direction DD2 and two second corner grooves TCC2 in the first diagonal direction DD1 that are adjacent to one end and the other end of the first corner portion C1 and face each other may be disposed at the boundary of the first corner portion C1.

[0157] Here, the point where the second corner groove TCC2 and the first corner groove TCC1, located on the boundary line with the second sub-pixel SP2, meet is defined as a first contact point (or first intersection point) IC1, and the point where the second corner groove TCC2 and the first corner groove TCC1, located on the boundary line with the fourth sub-pixel SP4, meet is defined as a second contact point (or second intersection point) IC2. These first contact point IC1 and second contact point IC2 can be considered to correspond to two vertices located in front of the first corner portion C1 in the protruding direction.

[0158] In one embodiment, the second corner groove TCC2 can have a first end connected to an end of the first side groove TCS1 and a second end connected to the first end of the first corner groove TCC1 at a first contact point IC1. The second end of the first corner groove TCC1 can be connected to a first end of another second corner groove TCC2 at a second contact point IC2. The second end of the other second corner groove TCC2 can be connected to an end of the second side groove TCS2.

[0159] The first contact IC1 of the first corner portion C1 may be connected to a second side groove TCS2 between adjacent subpixels in the column direction, for example, the second and third subpixels SP2 and SP3, located around the first corner portion C1. That is, one end of the second side groove TCS2 may be connected to the first contact IC1.

[0160] The second contact IC2 of the first corner portion C1 may be connected to a first side groove TCS1 between adjacent subpixels in the row direction, for example, the third and fourth subpixels SP3 and SP4, located around the first corner portion C1. That is, one end of the first side groove TCS1 may be connected to the second contact IC2.

[0161] According to the above-described structure and arrangement of the trenches TC, the trenches TC located on one side, for example, the right side, of each column sub-pixel SP along the boundary line of the column line (or the boundary line between adjacent column lines) may have a shape that protrudes to the right along this shape at the first corner C1. The trenches TC extending along the boundary line of the column line in this manner can be referred to as first trench lines.

[0162] The first trench line may be formed of a first side groove TCS1 in the column direction LD2 and first and second corner grooves TCC1 and TCC2 connected between adjacent first side grooves TCS1 and forming protruding portions in the shape of a right-angled isosceles.

[0163] The trench TC located on one side, for example, the lower side, of each row sub-pixel SP along the boundary line of the row line (or the boundary line between adjacent row lines) may have a shape that protrudes downward along this shape at the first corner C1. The trench TC extending along the boundary line of the row line in this way can be referred to as a second trench line.

[0164] The second trench line may be formed of first and second corner grooves TCC1 and TCC2 that are connected between adjacent second side grooves TCS2 in the row direction LD1 and form protruding portions in the shape of a right-angled isosceles.

[0165] At this time, the first trench line and the second trench line that intersect with each other can share the first corner groove TCC1 of the first corner portion C1.

[0166] In this manner, the first trench line and the second trench line, each having a protruding shape, intersect with each other, thereby defining a sub-pixel SP surrounded by these lines.

[0167] As described above, in this embodiment, the first to fourth sub-pixels SP1 to SP4, which are adjacent to each other and include the first sub-pixel SP1 to which the first corner portion C1 belongs, may be arranged around the protruding first corner portion C1.

[0168] Accordingly, the first to fourth corner portions C1 to C4 of the first to fourth sub-pixels SP1 to SP4, which are adjacent to each other, may be arranged in a form in which the protruding first corner portion C1 is at the center and the second, third, and fourth corner portions C2, C3, and C4 surround the periphery of the first corner portion C1.

[0169] With this arrangement, the second and fourth sub-pixels SP2 and SP4 adjacent to each other in the second diagonal direction DD2 are spaced apart with the first corner portion C1 of the first sub-pixel SP1 interposed therebetween.

[0170] Accordingly, the first corner C1 of the first subpixel SP1 and the second and third corners C2 and C3 of the second and third subpixels SP2 and SP3 located on the adjacent column line are arranged adjacent to each other around the first contact IC1, and the first corner C1 of the first subpixel SP1 and the third and fourth corners C3 and C4 of the third and fourth subpixels SP3 and SP4 located on the adjacent row line are arranged adjacent to each other around the second contact IC2.

[0171] As a result, the boundaries between the first, second, and third sub-pixels SP1, SP2, and SP3 have a "Y" shape, and the trenches TC located at these boundaries also have a "Y" shape.

[0172] In contrast, referring to FIG. 5, the first contact IC1 has three different trench TC portions, namely, the first corner groove TCC1, the second corner groove TCC2, and the second side groove TCS2, which meet to form a “Y”-shaped trench TC, and the intersection angles (or included angles) between these three trench portions are 90 degrees, 135 degrees, and 135 degrees.

[0173] Similarly, the boundaries between the second, third and fourth sub-pixels SP2, SP3 and SP4 have a "Y" shape, and the trenches TC located at these boundaries also have a "Y" shape.

[0174] In contrast, at the second contact IC2, the first corner groove TCC1, the second corner groove TCC2, and the first side groove TCS1, which are the trench TC portions in three different directions, meet to form a "Y"-shaped trench TC, and the intersection angles between these three trench portions are 90 degrees, 135 degrees, and 135 degrees.

[0175] In this embodiment, the trench TC formed at the boundary between adjacent subpixels may be formed in a "Y" shape with crossing angles of 90 degrees, 135 degrees, and 135 degrees. These crossing angles correspond to levels applicable to OPC design, so trenches TC with a desired width can be formed through a mask process to which the OPC design is applied.

[0176] In this regard, as mentioned above, in a display device in which rectangular sub-pixels are arranged, four corners, all of which have cross angles of 90 degrees, are gathered together, which limits the application of OPC design.

[0177] On the other hand, in this embodiment, only one corner has a crossing angle of 90 degrees, and the remaining two corners have a wide crossing angle of 135 degrees, so OPC design is applicable.

[0178] Meanwhile, in this embodiment, as described above, the sub-pixels SP are modified from squares and have substantially the same area as squares, which has the advantage of increasing the aperture ratio compared to rectangular sub-pixels.

[0179] This will be further discussed with reference to Figure 6. Figure 6 is a graph comparing the aperture ratios of rectangular sub-pixels and square sub-pixels.

[0180] 6, the rectangular sub-pixel SPc shown on the left side includes a light-emitting area EAc and a surrounding non-light-emitting area NEAc, and the square sub-pixel SPa shown on the right side includes a light-emitting area EAa and a surrounding non-light-emitting area NEAa.

[0181] Here, the area of ​​the rectangular subpixel SPc is set to be the same as the area of ​​the square subpixel SPa, and the width of the non-light-emitting region NEAc of the rectangular subpixel SPc is set to be the same as the width of the non-light-emitting region NEAa of the square subpixel SPa.

[0182] In this case, the perimeter of the non-emitting region NEAc of the rectangular subpixel SPc is larger than the perimeter of the non-emitting region NEAa of the square subpixel SPa, so the area of ​​the non-emitting region NEAc of the rectangular subpixel SPc is larger than the area of ​​the non-emitting region NEAa of the square subpixel SPa.

[0183] Accordingly, the area of ​​the light-emitting region EAa of the square sub-pixel SPa is larger than the area of ​​the light-emitting region EAc of the rectangular sub-pixel SPc.

[0184] In this regard, for example, if the width and length of the rectangular subpixel SPc are 2.42 μm and 7.26 μm, the width of the non-emissive region NEAc is 0.41 μm, and the width and length of the square subpixel SPa are both 4.19 μm, and the width of the non-emissive region NEAa is 0.41 μm, the areas of the subpixels SPc and SPa are the same, 17.56 μm. 2 The area of ​​the rectangular light-emitting region EAc is 10.30 μm 2 The area of ​​the square light-emitting region EAa is 11.35 μm 2 Accordingly, the aperture ratio of the rectangular sub-pixel SPc is 58.6%, and the aperture ratio of the square sub-pixel SPa is 64.6%, which means that the aperture ratio of the square sub-pixel SPa is much higher than that of the rectangular sub-pixel SPc.

[0185] As described above, the sub-pixel of this embodiment is a square with its corners modified, so that it has an aperture ratio that is substantially the same as or very close to that of a square.

[0186] Therefore, the light emitting display device of this embodiment can improve the aperture ratio.

[0187] Meanwhile, in this embodiment, the subpixels are squares with modified corner shapes, and various pixel structures including an RGBW structure, a pentile structure, and a delta structure can be implemented. For example, an RGBW structure can be implemented by arranging the subpixels of this embodiment as R, G, B, and W subpixels in a 2x2 matrix. An RGBG pentile structure can be implemented by arranging the subpixels of this embodiment as R and B subpixels in two rows and one column, and as G and G subpixels in two rows and two columns.

[0188] <Second Example>

[0189] FIG. 7 is a plan view schematically illustrating a light emitting display device according to a second embodiment of the present invention.

[0190] In the following description, detailed descriptions of configurations that are the same as or similar to those in the first embodiment described above may be omitted.

[0191] Referring to FIG. 7, in the light emitting display device 10 of this embodiment, each subpixel SP may be composed of a first region A1 having a light emitting region and a protruding second region A2 located on one side of a diagonal direction of the first region A1.

[0192] The sub-pixel SP has four corners, three of which have a slanted chamfer shape and the remaining corner Cp has a protruding square shape.

[0193] The first area A1 may have three chamfered corners, and the second area A2 may have one protruding corner Cp.

[0194] The light-emitting region in the first area A1 may include a light-emitting diode, and the light-emitting diode and the thin film transistor may be connected in the second area A2.

[0195] A trench TC may be formed along the boundary of each sub-pixel SP so as to surround it. In this way, the trench TC may be formed at the boundary between adjacent sub-pixels SP to separate them.

[0196] In this embodiment, the protruding corner portions Cp may be configured such that their directions alternate along the row lines.

[0197] In this regard, in the first embodiment described above, all the sub-pixels SP are configured so that the protruding corner portions have the same direction.

[0198] Alternatively, in this embodiment, the directions of the protruding corner portions Cp of the sub-pixels SP arranged along each row line may be configured to alternate between the first diagonal direction DD1 and the second diagonal direction DD2.

[0199] For example, for the subpixels SP arranged in two rows in FIG. 7, the protruding corners of the subpixels SP located on odd-numbered column lines are located on the lower right side and face the first diagonal direction DD1, while the protruding corners of the subpixels SP located on even-numbered column lines are located on the upper right side and face the second diagonal direction DD2.

[0200] According to this structure and arrangement of the subpixels SP, the first trench line corresponding to the trench TC located on one side, for example, the right side, of each column line subpixel SP and arranged on the boundary line extending along the column line (or the boundary line between adjacent column lines) can have a shape that protrudes to the right along this shape at the protruding corner portion Cp.

[0201] The first trench line may be formed of a first side groove TCS1 in the column direction LD2 and first and second corner grooves TCC1 and TCC2 connected between adjacent first side grooves TCS1 and forming protruding portions in the shape of a right-angled isosceles.

[0202] The second trench line corresponding to the trench TC located on one side, for example, the lower side, of each row line sub-pixel SP and arranged on the boundary line extending along the row line (or the boundary line between adjacent row lines) may have a shape in which the protruding corner portion Cp protrudes alternately downward and upward along this shape.

[0203] The second trench line may be formed of first and second corner grooves TCC1 and TCC2 that are connected between adjacent second side grooves TCS2 in the row direction LD1 and form protruding portions in the shape of a right-angled isosceles.

[0204] At this time, the first trench line and the second trench line can alternately share the first and second corner grooves TCC1 and TCC2 of the protruding corner portion Cp.

[0205] As a result of the first trench line and the second trench line, each having a protruding shape, intersecting with each other, a sub-pixel SP may be defined.

[0206] In the present embodiment configured as described above, the protruding corner portions Cp may be alternately arranged in opposite diagonal directions along the row lines, thereby preventing sub-pixel patterns from being repeated in the same direction, thereby improving the phenomenon of the same pattern being seen.

[0207] Of course, the light emitting display device 10 of this embodiment can have the effects and advantages mentioned in the first embodiment.

[0208] <Third Example>

[0209] FIG. 8 is a plan view schematically illustrating a light emitting display device according to a third embodiment of the present invention.

[0210] In the following description, detailed description of the same or similar configurations as those in the first and second embodiments may be omitted.

[0211] Referring to FIG. 8, in the light emitting display device 10 of this embodiment, each subpixel SP may be composed of a first region A1 having a light emitting region and a protruding second region A2 located on one side of the first region A1 in a diagonal direction.

[0212] The sub-pixel SP has four corners, three of which have a slanted chamfer shape and the remaining corner Cp has a protruding square shape.

[0213] The first area A1 may have three chamfered corners, and the second area A2 may have one protruding corner Cp.

[0214] The light-emitting region in the first area A1 may include a light-emitting diode, and the light-emitting diode and the thin film transistor may be connected in the second area A2.

[0215] A trench TC may be formed along the boundary of each sub-pixel SP so as to surround it. In this way, the trench TC may be formed at the boundary between adjacent sub-pixels SP to separate them.

[0216] In this embodiment, the protruding corner portions Cp may be configured such that their directions alternate along the column lines.

[0217] In this regard, in the first embodiment described above, all the sub-pixels SP are configured so that the protruding corner portions have the same direction.

[0218] Alternatively, in this embodiment, the sub-pixels SP arranged along each column line may be configured such that the directions of the protruding corner portions Cp alternate between the first diagonal direction DD1 and the second diagonal direction DD2.

[0219] For example, in FIG. 8, for the subpixels SP arranged in two columns, the protruding corners of the subpixels SP located on odd-numbered rows are located on the lower right side and face the first diagonal direction DD1, while the protruding corners of the subpixels SP located on even-numbered rows are located on the lower left side and face the second diagonal direction DD2.

[0220] According to this structure and arrangement of the subpixels SP, the first trench line corresponding to the trench TC located on one side, for example, the right side, of each column line subpixel SP and arranged on the boundary line extending along the column line (or the boundary line between adjacent column lines) can have a shape in which the protruding corner portion Cp protrudes alternately to the right and left along this shape.

[0221] The first trench line may be formed of a first side groove TCS1 in the column direction LD2 and first and second corner grooves TCC1 and TCC2 connected between adjacent first side grooves TCS1 and forming protruding portions in the shape of a right-angled isosceles.

[0222] The second trench line corresponding to the trench TC located on one side, for example, the lower side, of each row line sub-pixel SP and arranged on the boundary line extending along the row line (or the boundary line between adjacent row lines) may have a protruding corner portion Cp that protrudes downward along this shape.

[0223] The second trench line may be formed of first and second corner grooves TCC1 and TCC2 that are connected between adjacent second side grooves TCS2 in the row direction LD1 and form protruding portions in the shape of a right-angled isosceles.

[0224] At this time, the first trench line and the second trench line can alternately share the first and second corner grooves TCC1 and TCC2 of the protruding corner portion Cp.

[0225] As a result of the first trench line and the second trench line, each having a protruding shape, intersecting with each other, a sub-pixel SP may be defined.

[0226] In this embodiment, the protruding corner portions Cp may be alternately arranged in opposite diagonal directions along the column lines, thereby preventing sub-pixel patterns from being repeated in the same direction, thereby improving the phenomenon of the same pattern being seen.

[0227] Of course, the light emitting display device 10 of this embodiment can have the effects and advantages mentioned in the first embodiment.

[0228] As described above, according to an embodiment of the present invention, the trenches are formed along the boundaries of the subpixels, so that the light-emitting layers between adjacent subpixels can be physically separated from each other, thereby preventing leakage current from occurring through the light-emitting layers between adjacent subpixels.

[0229] Then, by modifying the right-angle corners of a square subpixel, three corners are chamfered and the remaining corner is protruded to form a square subpixel. Accordingly, trenches formed at the boundaries between adjacent subpixels can be formed in a "Y" shape with crossing angles of 90 degrees, 135 degrees, and 135 degrees. A trench of a desired width can be formed through a mask process using an OPC design, and as a result, the emitting layers of adjacent subpixels can be separated by the trench.

[0230] In addition, since sub-pixels are used in which the corners of a square are modified, a high aperture ratio that is substantially the same as or very close to that of a square can be achieved.

[0231] In addition, since sub-pixels are used that are formed by modifying the corners of a regular square, various pixel structures including an RGBW structure, a pentile structure, and a delta structure can be realized.

[0232] In addition, the protruding corners may be alternately arranged in opposite diagonal directions on row lines or column lines, which may prevent sub-pixel patterns in the same direction from being repeated, thereby improving the phenomenon of the same pattern being seen.

[0233] The above-described embodiments of the present invention are merely examples of the present invention, and modifications can be made freely within the spirit and scope of the present invention. Therefore, the present invention includes modifications of the present invention provided they come within the scope of the appended claims and their equivalents. [Explanation of symbols]

[0234] 10: Light-emitting display device 101: Circuit board 111: First insulating layer 112: Second insulating layer 113: Third insulating layer 121: 1st reflector 122:Second reflector 123: Third reflector 140: 1st electrode 143: Bank 160: Sealing layer 170: Color filter layer SP: Subpixel SP1, SP2, SP3, SP4: 1st, 2nd, 3rd, 4th subpixels A1, A2: 1st and 2nd area EA: Emitting area C1, C2, C3, C4: 1st, 2nd, 3rd, 4th corners Cp: ​​protruding corner TC: Trench TCS: Side grooves TCS1, TCS2: 1st and 2nd side grooves TCC: Corner groove TCC1, TCC2: 1st and 2nd corner grooves

Claims

1. a substrate on which a number of sub-pixels are defined, the sub-pixels being arranged in a matrix along a number of row lines and column lines; a first electrode formed on the substrate for each of the subpixels; a bank covering an edge of the first electrode and having a trench formed along a boundary between adjacent sub-pixels; a light-emitting layer located on the first electrode and separated into subpixels by the trench; a second electrode formed on the light-emitting layers of the plurality of sub-pixels; The subpixel has a protruding corner portion and three inclined corner portions of a square, the plurality of sub-pixels include first and second sub-pixels adjacent to each other in a row direction, and fourth and third sub-pixels adjacent to the first and second sub-pixels in a column direction, The trench is a first corner groove in a second diagonal direction formed at a boundary between a protruding corner portion in a first diagonal direction of the first sub-pixel and an inclined corner portion of the third sub-pixel adjacent thereto; second corner grooves in a first diagonal direction, which are formed at boundaries between the protruding corner portion of the first sub-pixel and the inclined corner portions of the second and fourth sub-pixels adjacent thereto on both sides, and which are connected to the first corner groove by first and second contact points, respectively; first side grooves formed in the column direction at a boundary between the first and second sub-pixels and at a boundary between the third and fourth sub-pixels; second side grooves in the row direction formed at a boundary between the second and third sub-pixels and a boundary between the first and fourth sub-pixels, respectively; a second side groove formed at a boundary between the second and third sub-pixels is connected to the first contact, and a first side groove formed at a boundary between the third and fourth sub-pixels is connected to the second contact.

2. a first side groove formed at a boundary between the first and second sub-pixels is connected to a second corner groove connected to the first contact; The light emitting display device of claim 1 , wherein a second side groove formed at a boundary between the first and fourth sub-pixels is connected to a second corner groove connected to the second contact.

3. The light emitting display device of claim 1 , wherein the protruding corner portions of the plurality of sub-pixels protrude in the same direction.

4. 2. The light emitting display device of claim 1, wherein the protruding corners of the sub-pixels arranged in each of the plurality of row lines alternate in the first and second diagonal directions.

5. 2. The light emitting display device of claim 1, wherein the protruding corners of the sub-pixels arranged on each of the plurality of column lines alternate in the first and second diagonal directions.

6. The light emitting display device according to claim 1 , wherein the protruding corner portion is a square.

7. the protruding corner portion of the sub-pixel is a regular square formed by combining four right-angled isosceles triangle portions, The light emitting display device of claim 6 , wherein a square subpixel is formed by combining three of the right-angled isosceles triangular portions with three of the inclined corners of the subpixel.

8. a thin film transistor located at the corner of the subpixel; the thin film transistor further includes at least one insulating layer positioned between the thin film transistor and the first electrode and having a contact hole; 8. The light emitting display device according to claim 1, wherein the first electrode and the thin film transistor are connected to each other through the contact hole at the corner portion.

9. The light emitting display device of claim 8 , wherein the trench extends into the at least one insulating layer.

10. the at least one insulating layer includes a first insulating layer, a second insulating layer on the first insulating layer, and a third insulating layer on the second insulating layer; the plurality of sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel; The red sub-pixel includes a first reflector interposed between the first insulating layer and the second insulating layer, The green sub-pixel includes a second reflector interposed between the second insulating layer and the third insulating layer, The light emitting display device of claim 9 , wherein a third reflector is disposed between the third insulating layer and the first electrode in the blue subpixel.

11. 8. The light-emitting display device according to claim 1, wherein the light-emitting layer emits white light.

12. a substrate on which a number of sub-pixels are defined, the sub-pixels being arranged in a matrix along a number of row lines and column lines; a first electrode formed on the substrate for each of the subpixels; a bank covering an edge of the first electrode and having a trench formed along a boundary between adjacent sub-pixels; a light-emitting layer located on the first electrode and separated into subpixels by the trench; a second electrode formed on the light-emitting layers of the plurality of sub-pixels; The trench is a first trench line along the boundary between adjacent column lines; a second trench line along a boundary between adjacent row lines; the first trench line includes a first side groove in a column direction and first and second corner grooves connected between adjacent first side grooves, forming an isosceles portion protruding to one side in a row direction, having second and first diagonal directions, respectively, and connected to each other at a first junction; the second trench line includes a second side groove in a row direction and the first and second corner grooves connected between adjacent second side grooves, forming an isosceles portion protruding to one side in a column direction, and connected to each other at a second junction; The light emitting display device, wherein the protruding isosceles portion of the first trench line and the protruding isosceles portion of the second trench line share the first corner groove.

13. The light emitting display device of claim 12 , wherein the second side groove is connected to the first contact point, and the first side groove is connected to the second contact point.

14. The protruding directions of the plurality of protruding isosceles portions located on the first trench line are the same, The light emitting display device of claim 12 , wherein the protruding isosceles portions located on the second trench line protrude in the same direction.

15. The protruding directions of the plurality of protruding isosceles portions located on the second trench line are alternately arranged on both sides of the column direction, The light emitting display device of claim 12 , wherein the protruding isosceles portions located on the first trench line protrude in the same direction.

16. The protruding directions of the plurality of protruding isosceles portions located on the first trench line alternate on both sides of the row direction, The light emitting display device of claim 12 , wherein the protruding isosceles portions located on the second trench line protrude in the same direction.

17. the protruding isosceles portion of the first trench line is a right-angled isosceles portion, The light emitting display device of claim 12 , wherein the protruding isosceles portion of the second trench line is a right-angled isosceles portion.

18. a thin film transistor located at a corner of the sub-pixel surrounded by the protruding isosceles portion of the first trench line and the protruding isosceles portion of the second trench line; the thin film transistor further includes at least one insulating layer positioned between the thin film transistor and the first electrode and having a contact hole; 18. The light emitting display device according to claim 12, wherein the first electrode and the thin film transistor are connected to each other through the contact hole at the corner portion.

19. 20. The light emitting display device of claim 18, wherein the trench extends into the at least one insulating layer.

20. the at least one insulating layer includes a first insulating layer, a second insulating layer on the first insulating layer, and a third insulating layer on the second insulating layer; the plurality of sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel; The red sub-pixel includes a first reflector interposed between the first insulating layer and the second insulating layer, The green sub-pixel includes a second reflector interposed between the second insulating layer and the third insulating layer, The light emitting display device of claim 19, wherein a third reflector is disposed between the third insulating layer and the first electrode in the blue subpixel.

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