Organic light emitting display device

Abstract

An organic light-emitting display device includes: light-emitting diodes, which are respectively located in first to third sub-pixels on a substrate and respectively emit red light, green light and blue light output upward through emission areas of the first to third sub-pixels; and a reflective structure, which is located in a non-emitting area surrounded by the first to third sub-pixels and includes a reflective side surface, which is inclined and faces the emission areas of the first to third sub-pixels, respectively, wherein the reflective side surface reflects light incident thereon from the corresponding emission areas upward.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2019-0105182 filed in Korea on August 27, 2019, which is hereby incorporated by reference in its entirety for all purposes as if fully set forth herein. Technical Field

[0002] The invention relates to an organic light emitting display device. Background Art

[0003] Recently, flat panel display devices having excellent properties such as thin profile, light weight, and low power consumption have been widely developed and applied to various fields.

[0004] Among flat panel display devices, an organic light emitting display device may be referred to as an organic electroluminescent display device, and is a device in which charges are injected into an emission layer formed between a cathode as an electron injection electrode and an anode as a hole injection electrode to form electron-hole pairs, and light is emitted when the electron-hole pairs disappear.

[0005] In the case of a display device having a short viewing distance such as a virtual reality display device, a high resolution is required so that a viewer does not recognize the grid of the display device.

[0006] However, due to the limitation of manufacturing process, it is difficult to realize an organic light emitting display device with high resolution. Therefore, a solution to solve the grid recognition of organic light emitting display devices is needed. Summary of the invention

[0007] Accordingly, the present invention is directed to an organic light emitting display device that substantially overcomes one or more problems due to limitations and disadvantages of the related art.

[0008] An object of the present invention is to provide an organic light emitting display device capable of effectively reducing grid recognition thereof.

[0009] Additional features and advantages of the present disclosure will be set forth in the following description, and in part will be apparent from the description, or may be understood through the practice of the present disclosure. The advantages of the present disclosure will be realized and obtained through the structures particularly pointed out in the specification and claims and the drawings.

[0010] To achieve these and other advantages and in accordance with the purposes of the present invention, as specifically implemented and broadly described herein, an organic light-emitting display device includes: light-emitting diodes, respectively located in first to third sub-pixels on a substrate, and respectively emitting red light, green light and blue light output upward through the emission areas of the first to third sub-pixels; and a reflective structure, located in a non-emitting area surrounded by the first to third sub-pixels and including a reflective side surface, which is inclined and faces the emission areas of the first to third sub-pixels, respectively, wherein the reflective side surface reflects light incident thereon from the corresponding emission areas upward.

[0011] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings, which are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In the drawings:

[0013] Figure 1 is a plan view schematically showing a plan structure of an organic light emitting display device according to the present invention;

[0014] Figure 2 is a plan view schematically showing a plan structure of an organic light emitting display device according to a first embodiment of the present invention;

[0015] Figure 3 is a diagram schematically showing an area displaying red when the organic light emitting display device of the comparative example and the organic light emitting display device of the first embodiment each operate to display a single color of red;

[0016] Figure 4 is a diagram schematically illustrating an organic light emitting display device operating to display two colors according to a first embodiment of the present invention;

[0017] Figure 5 is a diagram schematically illustrating an organic light emitting display device operating to display three colors according to a first embodiment of the present invention;

[0018] Figure 6 is along Figure 2 A cross-sectional view taken along line VI-VI of ;

[0019] Figure 7 is along Figure 2 A cross-sectional view taken along line VII-VII;

[0020] Figure 8 is along Figure 2A cross-sectional view taken along line VIII-VIII of ;

[0021] Fig. 9 is a diagram schematically showing a reflective structure having a quadrangular pyramid shape according to a first embodiment of the present invention;

[0022] Fig.10 is a diagram schematically showing a reflective structure having a truncated quadrangular pyramid shape according to a first embodiment of the present invention;

[0023] Fig.11 is a diagram schematically showing a reflective structure having a concave reflective side surface according to a first embodiment of the present invention;

[0024] Fig.12 is a cross-sectional view showing an organic light emitting display device according to a second embodiment of the present invention;

[0025] Fig.13 is a cross-sectional view showing an organic light emitting display device according to a third embodiment of the present invention;

[0026] Fig.14 is a plan view schematically showing a plan structure of an organic light emitting display device according to a fourth embodiment of the present invention;

[0027] Fig.15 is a diagram schematically showing an area displaying red when the organic light emitting display device of the comparative example and the organic light emitting display device of the fourth embodiment each operate to display a single color of red;

[0028] Fig.16 is a diagram schematically illustrating an organic light emitting display device operating to display two colors according to a fourth embodiment of the present invention; and

[0029] Fig.17 is a diagram schematically illustrating an organic light emitting display device operating to display three colors according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0030] Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. Throughout the drawings, the same or similar reference numerals may be used to refer to the same or similar parts.

[0031] Figure 1 is a plan view schematically showing a plan structure of an organic light emitting display device according to the present invention.

[0032] refer to Figure 1The organic light emitting display device 10 of the present invention may include a reflective structure RS located in a non-emitting region surrounded by a plurality of sub-pixels SP adjacent to the reflective structure RS and including a reflective side surface RSS facing an emission region EA of the sub-pixels SP.

[0033] The sub-pixels SP arranged to surround the reflective structure RS may include three or more sub-pixels SP displaying different colors. For example, the sub-pixels SP may include at least one sub-pixel SP emitting red (R), at least one sub-pixel SP emitting blue (B), and at least one sub-pixel SP emitting green (G). Figure 1 , for the purpose of explanation, a configuration in which one red (R) sub-pixel SP, one blue (B) sub-pixel SP, and one blue (B) sub-pixel SP are arranged to surround the reflective structure RS is shown by way of example.

[0034] By using the reflective structure RS, light incident on the reflective side surface RSS is reflected and output upward, and the area where the sub-pixel SP outputs light can be substantially planarly expanded. Therefore, there is an effect as if the distance between sub-pixels SP of the same color is reduced, and thus grid recognition can be reduced.

[0035] In addition, due to the expansion of the light output area of ​​the sub-pixel SP, when the organic light emitting display device is applied to a virtual reality display device, the immersion feeling of virtual reality can be improved.

[0036] Furthermore, the non-emission region where the reflective structure RS is located serves as a light output region and acts as a display element like a sub-pixel SP. Therefore, there is an effect of increasing resolution.

[0037] An embodiment of an organic light emitting display device having a reflective structure RS is explained in detail below.

[0038] <First Embodiment>

[0039] Figure 2 is a plan view schematically showing a plan structure of an organic light emitting display device according to a first embodiment of the present invention.

[0040] refer to Figure 2 The organic light emitting display device 10 of the present embodiment may be a top emission type display device which emits light in an upward direction from a substrate to display an image. In the organic light emitting display device 10, a plurality of sub-pixels SP may be arranged in a display region to display an image.

[0041] For illustration purposes, Figure 2 The horizontal direction in the plane of may be referred to as the row direction (or the first direction), and Figure 2 The vertical direction in the plane of may be referred to as the column direction (or second direction).

[0042] The plurality of sub-pixels SP may include three sub-pixels, ie, first to third sub-pixels SP1 to SP3 that emit different colors.

[0043] For example, the first sub-pixel SP1, the second sub-pixel SP2 and the third sub-pixel SP3 can display different colors among red (R), blue (B) and green (G). In this embodiment, the first sub-pixel SP1, the second sub-pixel SP2 and the third sub-pixel SP3 display red (R), blue (B) and green (G) respectively by way of example.

[0044] In each of the first to third subpixels SP1 to SP3, an emission area EA may be defined that emits and outputs its corresponding color toward a display surface located above the substrate. Each subpixel may include a light emitting diode OD as a light emitting element that generates its corresponding color.

[0045] In this regard, in the first sub-pixel SP1, a first light emitting diode OD1 emitting red (R) may be formed and output red (R). In the second sub-pixel SP2, a second light emitting diode OD2 emitting blue (B) may be formed and output blue (B). In the third sub-pixel SP3, a third light emitting diode OD3 emitting green (G) may be formed and output green (G).

[0046] The emission area EA in each sub-pixel EA may be defined by an opening formed in a bank corresponding to each sub-pixel SP. In this regard, the bank located between the sub-pixels SP (or between the emission areas EA) may include an opening exposing a first electrode that is a lower electrode of the light emitting diode OD of each sub-pixel SP, the organic light emitting layer may be located in the opening, and an area of ​​the opening may be defined as the emission area EA of the sub-pixel SP.

[0047] The emission area EA of the sub-pixel SP may have various planar shapes. Figure 2 As shown, the emission area EA may have, but is not limited to, a diamond shape. Alternatively, the emission area EA may have a circular shape or other quadrilateral shapes. When the emission area EA has a diamond shape, a consistent distance to the reflective structure RS disposed adjacent thereto may be effectively ensured.

[0048] In the present embodiment, the first to third sub-pixels SP1 to SP3 may be arranged in a specific arrangement, for example, the first to third sub-pixels SP1 to SP3 may have a diamond pixel arrangement.

[0049] Regarding the diamond pixel arrangement, four sub-pixels SP adjacent to each other, for example, a first sub-pixel SP1 of red (R), a second sub-pixel SP2 of blue (B), and two third sub-pixels SP3 of green (G) may form a diamond arrangement unit, such as Figure 2 As shown. Alternatively, in consideration of lifespan, two second sub-pixels SP2 of blue (B) may be used in the arrangement. Alternatively, one of the two third sub-pixels SP3 may be replaced with a white sub-pixel.

[0050] The emission areas EA of the sub-pixels SP1 to SP3 of different colors may be the same or different in area. The emission areas EA being different in area means that the emission areas EA of the first to third sub-pixels SP1 to SP3 are different in area from each other, or the emission area EA of one of the first to third sub-pixels SP1 to SP3 is different in area from the emission areas EA of the other two of the first to third sub-pixels SP1 to SP3.

[0051] In the present embodiment, for the purpose of explanation, the emission areas EA of the first to third sub-pixels SP1 to SP3 having the same area are shown by way of example. Meanwhile, regarding the emission areas EA of the first to third sub-pixels SP1 to SP3 having different areas, for example, the first emission area EA1 of red (R) and the second emission area EA2 of blue (B) may have the same area or different areas, and the areas of the first emission area EA1 and the second emission area EA2 may be greater than the area of ​​the third emission area EA3 of green (G).

[0052] In this embodiment, by using a reflective structure RS, the light output area of ​​each color is output and viewed. Therefore, the area relationship of the light output areas of different colors can be formed according to the above-mentioned area relationship of the emission areas of different colors. In other words, the light output areas of different colors can be the same or different in area.

[0053] Regarding the arrangement of the subpixels SP, in one of the odd-numbered row lines and the even-numbered row lines as two adjacent row lines, for example, in the odd-numbered row lines, the first subpixel SP1 and the second subpixel SP2 may be alternately arranged, and in the even-numbered row lines, the third subpixel SP3 may be arranged. In addition, the third subpixel SP3 may be arranged in a direction diagonal to the first subpixel SP1 and the second subpixel SP2. In other words, in two adjacent row lines, the first subpixel SP1 and the second subpixel SP2 and the third subpixel SP3 may be arranged in a zigzag form along the row direction.

[0054] In addition, in one of the odd-numbered column lines and the even-numbered column lines as two adjacent column lines, the first and second sub-pixels may be alternately arranged, and in the other of the odd-numbered column lines and the even-numbered column lines, the third sub-pixel SP3 may be arranged. In other words, in two adjacent column lines, the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 may be arranged in a zigzag form along the column direction.

[0055] Since the sub-pixels SP can be arranged as above, a rhombus arrangement unit can be defined, wherein the first sub-pixel SP1 and the second sub-pixel SP2 are located on opposite sides and face each other, and the two third sub-pixels SP3 are located on opposite sides and face each other. In addition, the rhombus arrangement unit can be repeatedly arranged in a plane. For example, adjacent arrangement units can be arranged to share one side therebetween. In this regard, the arrangement units can be arranged diagonally so that two arrangement units diagonally adjacent to each other share two sub-pixels SP on one side therebetween.

[0056] In the above-mentioned diamond pixel arrangement, the third sub-pixel SP3 of green (G) and the first sub-pixel SP1 and the second sub-pixel SP2 of red (R) and blue (B) arranged diagonally to the third sub-pixel SP3 can form a pixel P as a unit for displaying a color image, and adjacent pixels P can share the first sub-pixel SP1 or the second sub-pixel SP2 therebetween to display an image. For example, Figure 2 As shown, the third sub-pixel SP3, the first sub-pixel SP1 and the second sub-pixel SP2 located in the row line adjacent to the row line of the third sub-pixel SP3 and diagonally opposite to the third sub-pixel SP3 can form a pixel P, and each pixel P can share its adjacent pixels P on both sides along the row direction. This means that each pixel SP is composed of one third sub-pixel SP3, half of the first sub-pixel SP1, and half of the second sub-pixel SP2.

[0057] As described above, in the diamond pixel arrangement, the number of the third sub-pixels SP3 may be twice the number of the first sub-pixels SP1 and the number of the second sub-pixels SP2.

[0058] In the above-mentioned diamond pixel arrangement, as an inner area of ​​the diamond arrangement unit, a non-emission area NEA surrounded by four sub-pixels SP forming the diamond arrangement unit and having no light emitting element may be defined.

[0059] In other words, each non-emission area NEA may be configured to be surrounded by two sub-pixels SP adjacent on both sides thereof in a row line thereof and two sub-pixels SP adjacent on both sides thereof in a column line thereof.

[0060] For example, the non-emission area NEA in the row line where the third subpixel SP3 is located may be surrounded by two third subpixels SP3 adjacent on both sides thereof in the row line and the first and second subpixels SP1 and SP2 adjacent on both sides thereof in the column line.

[0061] Furthermore, the non-emission area NEA in the row line where the first and second subpixels SP1 and SP2 are located may be surrounded by the first and second subpixels SP1 and SP2 adjacent on both sides thereof in the row line and two third subpixels SP3 adjacent on both sides thereof in the column line.

[0062] In the non-emission area NEA defined by its adjacent sub-pixels SP, a reflective structure RS may be constructed.

[0063] The reflective structure RS may include reflective side surfaces RSS respectively corresponding to the sub-pixels SP surrounding the reflective structure RS. In other words, in the reflective structure RS, the reflective side surfaces RSS may be arranged to face the four sub-pixels SP (ie, the emission areas EA of the four sub-pixels SP), respectively.

[0064] To improve reflection efficiency, each reflective side surface RSS may be configured to face the emission area EA of the sub-pixel SP directly in front thereof in a plan view.

[0065] In addition, the reflective side surface RSS may be configured to be inclined. In this regard, the reflective side surface RSS may be configured as an inclined surface inclined toward the inner side of the reflective structure RS in an upward direction.

[0066] By forming the reflective side surface RSS to be inclined, light laterally output from the corresponding sub-pixel SP may be reflected on the inclined reflective side surface RSS and then directly output upward to the front of the display device.

[0067] The reflective side surface RSS may be configured to have a completely flat planar shape, or to have a concave shape that is concave toward the inner side of the reflective structure RS. In the case of a concave shape, the reflective side surface RSS may be used as a concave mirror, and the reflection efficiency may be improved. The planar shape or concave shape of the reflective side surface RSS will be described in detail below.

[0068] Thus, the reflective side surface RSS may function as a light output portion that outputs light generated from a corresponding sub-pixel SP to a display surface.

[0069] At this point, for example, light laterally emitted from each of the first subpixel SP1 and the second subpixel SP2 located at opposite sides of the reflective structure RS enters and is reflected on the reflective side surface RSS corresponding to each of the first subpixel SP1 and the second subpixel SP2, and is then output upward. Likewise, light laterally emitted from each of the two third subpixels SP3 located at opposite sides of the reflective structure RS enters and is reflected on the reflective side surface RSS corresponding to each of the two third subpixels SP1 and SP2, and is then output upward.

[0070] Due to such reflection and output of light, an effect of planar expansion of the light output area of ​​the sub-pixel SP can be achieved.

[0071] In other words, since the area of ​​each reflective side surface RSS of the reflective structure RS can be used to output light upward to the display surface like the emission area of ​​the sub-pixel SP, the non-emission area NEA where the reflective structure RS is located can be regarded as the emission area of ​​the sub-pixel SP. Therefore, the effect of extending the output area of ​​light from the sub-pixel SP to the non-emission area NEA of the reflective structure RS can be achieved.

[0072] Therefore, there may be an effect as if the distance between the sub-pixels SP of the same color is reduced, and thus the grid recognition may be reduced.

[0073] This can be further referenced Figure 3 . Figure 3 is a diagram schematically illustrating an area displaying red when the organic light emitting display device of the comparative example and the organic light emitting display device of the first embodiment each operate to display a single color (eg, red).

[0074] In the organic light emitting display device of the comparative example, no reflective structure is formed at the non-emission area NEA surrounded by the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 arranged in a diamond shape.

[0075] When the organic light emitting display device of the comparative example operates to display a single color of red, red light is output only at the emission area EA1 of the red sub-pixel SP1.

[0076] In the control example, the distance between adjacent areas showing the same color was as large as recognized by the viewer, so grid recognition occurred.

[0077] When the organic light emitting display device of this embodiment operates to display a single color of red, red light is output at the emission area EA1 of the red first subpixel SP1 and also output from the reflective side surface RSS of the reflective structure RS located at the non-emission area NEA adjacent to the emission area EA1.

[0078] Thus, in this embodiment, the output area of ​​the red light includes the emission area EA1 of the red first subpixel SP1, and can be extended to the corresponding reflection area of ​​the non-emission area NEA located in the lateral direction of the first subpixel SP1 (that is, the area of ​​the corresponding reflection side RSS of the reflection structure RS).

[0079] Compared with the control example, the distance between adjacent areas showing the same color can be reduced. Therefore, the grid recognition can be reduced by 1.5 times.

[0080] Therefore, grid recognition felt by the viewer can be significantly reduced.

[0081] In addition, by expanding the light output area of ​​the sub-pixel SP, when the organic light emitting display device is used as a virtual reality display device, the immersion feeling of virtual reality can be improved.

[0082] In addition, the non-emission region of the reflective structure RS serves as a light output region and acts as a display element like a sub-pixel SP. Therefore, there are also effects of increased light transmittance and increased resolution.

[0083] Figure 4 is a diagram schematically illustrating an organic light emitting display device operating to display two colors according to a first embodiment of the present invention. Figure 5 is a diagram schematically illustrating an organic light emitting display device operating to display three colors according to a first embodiment of the present invention.

[0084] exist Figure 4 , the operation of displaying two colors (for example, red and blue) is shown by way of example. In this case, the emission area EA1 of the first sub-pixel SP1 outputs red light, and the emission area EA2 of the second sub-pixel SP outputs blue light. In addition, the red light and the blue light are output through the corresponding reflective side surfaces RSS of the reflective structure RS, which are located at the non-emitting area NEA adjacent to the first sub-pixel SP1 and the second sub-pixel SP2, and correspond to the first sub-pixel SP1 and the second sub-pixel SP2, respectively. In this way, in the case of an operation of displaying two colors, a color light that is a mixed (or combined) color light of the two color lights emitted is output and seen.

[0085] exist Figure 5, the operation of displaying three colors (for example, red, blue, and green) is shown by way of example. In this case, the emission areas EA1, EA2, and EA3 of the first subpixel SP1 to the third subpixel SP3 output red light, blue light, and green light. In addition, the red light, the blue light, and the green light are output through the corresponding reflective side surfaces RSS of the reflective structure RS, which are located at the non-emitting areas NEA adjacent to the first subpixel SP1 to the third subpixel SP3 and correspond to the first subpixel SP1 to the third subpixel SP3, respectively. In this way, in the case of the operation of displaying three colors, a color light that is a mixed (or combined) color light of the three color lights emitted is output and seen.

[0086] As in Figures 3 to 5 In the light emitting operation of the reflective structure RS, the color of the light passing through the reflective structure RS may be changed according to a combination of light emitting states of the first to third sub-pixels SP1 to SP3 surrounding the reflective structure RS.

[0087] Return to reference Figure 2 In each sub-pixel SP, an electrode contact hole CH may be formed at a peripheral region outside the emission area EA. Through the electrode contact hole CH, a first electrode of the light emitting diode OD of each sub-pixel SP may be electrically connected to a driving element (e.g., a driving transistor) of each sub-pixel SP.

[0088] The electrode contact holes CH of the sub-pixels SP may be formed in the same direction and at the same position. Figure 2 As shown, each electrode contact hole CH may be located at a corner of a lower left side of each emission area EA.

[0089] In each non-emission area NEA surrounded by the corresponding sub-pixel SP, a dummy hole DH may be formed to have a position and structure corresponding to the electrode contact hole CH. Since the non-emission area NEA has the reflective structure RS as a non-emission element, the dummy hole DH may not require a connection structure of the driving element and the light emitting diode OD in the electrode contact hole CH, and may not have the connection structure.

[0090] In the display device, the number of the electrode contact holes CH may be equal to the number of the dummy holes DH.

[0091] The following will refer to Figures 6 to 8 The structure of the sub-pixel SP and the structure of the non-emission area NEA having the reflective structure RS are explained in further detail.

[0092] Figure 6 is along Figure 2 A cross-sectional view taken along line VI-VI. Figure 7 is along Figure 2 A cross-sectional view taken along line VII-VII. Figure 8 is along Figure 2 A cross-sectional view taken along line VIII-VIII.

[0093] refer to Figure 2 as well as Figures 6 to 8 In the organic light emitting display device 10 of the present embodiment, a light emitting diode OD and a driving element for driving the light emitting diode OD may be formed in each sub-pixel SP on the substrate 101. A driving element may be used, for example, a plurality of transistors including a driving transistor Td and a switching transistor (not shown) electrically connected to the driving transistor Td. The plurality of transistors may be configured with an N-type transistor and / or a P-type transistor.

[0094] The light emitting diode OD may be connected to one of the plurality of transistors in the sub-pixel SP, and in the present embodiment, the light emitting diode OD connected to the driving transistor Td is shown by way of example. The light emitting diode OD may be connected to the drain electrode 133 or the source electrode 131 of the driving transistor Td, and in the present embodiment, the light emitting diode OD connected to the drain electrode 133 is shown by way of example.

[0095] On the substrate 101 , a reflective structure RS may be formed at a non-emission area NEA surrounded by sub-pixels SP arranged in a diamond shape.

[0096] Specifically, the semiconductor layer 112 may be formed on the inner surface of the substrate 101. The semiconductor layer 112 may be made of polysilicon or an oxide semiconductor material, but is not limited thereto.

[0097] A gate insulating layer 115 as an insulating layer may be formed on the semiconductor layer 112. The gate insulating layer 115 may be formed of an inorganic insulating material, for example, silicon oxide (SiO2) or silicon nitride (SiNx).

[0098] A gate electrode 120 made of a conductive material such as metal may be formed on the gate insulating layer 115 corresponding to the center of the semiconductor layer 112 .

[0099] In addition, a gate line connected to a gate electrode of the switching transistor may be formed on the gate insulating layer 115 .

[0100] An interlayer insulating layer 125 as an insulating layer may be formed on the gate electrode 120. The interlayer insulating layer 125 may be entirely formed over the substrate 101.

[0101] The interlayer insulating layer 125 may be formed of an inorganic insulating material such as silicon oxide (SiO 2 ) or silicon nitride (SiN x ) or an organic insulating material such as benzocyclobutene (BCB) or photo acryl.

[0102] The interlayer insulating layer 125 may have first and second contact holes CH1 and CH2 that expose both side portions of the semiconductor layer 112 , respectively.

[0103] The first contact hole CH1 and the second contact hole CH2 may be located at both sides of the gate electrode 120 and spaced apart from the gate electrode 120. In addition, the first contact hole CH1 and the second contact hole CH2 may be formed in the gate insulating layer 115.

[0104] A source electrode 131 and a drain electrode 133 made of a conductive material such as metal may be formed on the interlayer insulating layer 125 .

[0105] In addition, a data line crossing the gate line and connected to a source electrode of the switching transistor may be formed on the interlayer insulating layer 125 .

[0106] The source electrode 131 and the drain electrode 133 may be spaced apart from each other with the gate electrode 120 therebetween, and may contact both side portions of the semiconductor layer 112 through the first and second contact holes CH1 and CH2 , respectively.

[0107] The semiconductor layer 112 , the gate electrode 120 , and the source and drain electrodes 131 and 133 may form a driving transistor Td.

[0108] Alternatively, the driving transistor Td may have an inverted staggered structure in which a gate electrode is located below a semiconductor layer, and a source electrode and a drain electrode are located on the semiconductor layer.

[0109] A passivation layer 140 as an insulating layer may be formed on the source electrode 131 and the drain electrode 133. The passivation layer 140 may be entirely formed over the substrate 101.

[0110] The passivation layer 140 may have a single-layer or multi-layer structure.

[0111] In the case of a single-layer structure, the passivation layer 140 may be formed using an inorganic insulating material or an organic insulating material. In the case of a multi-layer structure, the passivation layer 140 may be formed using at least one of an inorganic insulating material or an organic insulating material.

[0112] The inorganic material for the passivation layer 140 may be silicon oxide (SiO2) or silicon nitride (SiNx). The organic material for the passivation layer 140 may be benzocyclobutene (BCB) or photosensitive acryl.

[0113] In this embodiment, the passivation layer 140 having a double-layer structure is shown by way of example. In this case, the passivation layer 140 may include a first passivation layer 141 made of an inorganic insulating material and a second passivation layer 142 located on the first passivation layer 141 and made of an organic insulating material and having a flat top surface.

[0114] The passivation layer 140 may include an electrode contact hole (or a drain contact hole) CH formed in each sub-pixel SP.

[0115] In the non-emission area NEA, the passivation layer 140 may include a dummy hole DH. The dummy hole DH may be formed in the process of forming the electrode contact hole CH. The position of the dummy hole DH in the non-emission area NEA may be set substantially equal to the position of the electrode contact hole CH in the subpixel SP.

[0116] In this regard, the electrode contact hole CH may be located within the emission area EA in each sub-pixel SP, or at a peripheral area around the emission area EA in each sub-pixel SP. When preventing light leakage, the electrode contact hole CH is preferably located at a peripheral area around the emission area EA in each sub-pixel SP.

[0117] For example, refer to Figure 2 In a plan view, the electrode contact hole CH may be located at a portion of the lower left side of the subpixel SP, more specifically, at a lower left corner of the subpixel SP. The dummy hole DH may be located at a position corresponding to the position of the electrode contact hole CH in the non-emission area NEA.

[0118] Since the non-emission area NEA has the reflective structure RS as a non-emission element, the connection structure of the driving transistor Td and the light emitting diode OD in the electrode contact hole CH may not be formed in the dummy hole DH.

[0119] The first electrode 150 may be formed on the passivation layer 140 in each sub-pixel SP. The reflective structure RS may be formed on the passivation layer 140 in the non-emission area NEA.

[0120] The first electrode 150 as a lower electrode of the light emitting diode OD may be formed to have a patterned shape in each sub-pixel SP. The first electrode 150 may be connected to the drain electrode 133 of the driving transistor Td through the electrode contact hole CH.

[0121] The first electrode 150 may include a metal having a reflective property and serve as a reflective electrode. Therefore, light emitted from the organic light emitting layer is reflected on the first electrode 150 and then output upward to the display surface. The metal of the first electrode 150 may be, but is not limited to, Ag, Ti, APC (Al-Pd-Cu) alloy, etc.

[0122] The first electrode 150 may have a single-layer structure having a reflective layer made of a metal having reflective properties, or a multi-layer structure having a transparent layer made of a transparent conductive material such as ITO, IZO, etc. and located on the reflective layer.

[0123] In the non-emission area NEA, a protrusion pattern 160 for defining the shape of the reflective structure RS may be formed The protrusion pattern 160 may have a tapered shape protruding upward and decreasing in size (or width) in an upward direction.

[0124] The protruding pattern 160 may be a structure including inclined side surfaces 161 respectively corresponding to the sub-pixels SP surrounding the protruding pattern 160. For example, the protruding pattern 160 may have a polygonal pyramid shape with a top end as a vertex or a truncated polygonal pyramid shape with a top end as a surface. For example, the polygonal pyramid shape may be a quadrangular pyramid shape, and the truncated polygonal pyramid shape may be a truncated quadrangular pyramid shape. The quadrangular pyramid shape may refer to Fig. 9 , and the truncated tetrahedron can refer to Fig.10 .

[0125] The reflective first electrode 150 formed at one of the four sub-pixels SP surrounding the conical protruding pattern 160 may extend over the protruding pattern 160. In the present embodiment, the first electrode 150 formed on the sub-pixel SP on one side (e.g., the right side) of the non-emission area NEA may extend to cover the protruding pattern 160 of the non-emission area NEA.

[0126] The first electrode 150 of each sub-pixel SP may include an electrode extending portion 153 extending from the emission area EA to four non-emission areas NEA adjacent to each sub-pixel SP. The electrode extending portion 153 extending to the non-emission area NEA on one side (e.g., the left side) of the sub-pixel SP may include a portion covering the protruding pattern 160 along a surface of the protruding pattern 160, and this portion of the electrode extending portion 153 may be referred to as a reflective portion 155.

[0127] The protrusion pattern 160 and the reflective portion 155 located on the protrusion pattern 160 and completely covering the surface of the protrusion pattern 160 may form a reflective structure RS.

[0128] Since the reflective portion 155 can cover the protruding pattern 160, the reflective structure RS can include reflective side surfaces RSS, each of which corresponds to each sub-pixel SP surrounding the reflective structure RS. In other words, the side surface of the reflective portion 155 located on the inclined side surface 161 of the protruding pattern 160 can serve as the reflective side surface RSS.

[0129] The tilt angle of the reflective side surface RSS with respect to the surface of the substrate 101 may be in the range of, for example, about 30 degrees to about 60 degrees in order to effectively achieve upward reflection.

[0130] As shown, the reflective side RSS can be flat. Alternatively, Fig.11 As shown, the reflective side surface RSS may be concave.

[0131] The reflective portion 155 of the reflective structure RS may be formed such that the reflective portion 155 does not extend from the first electrode 150 of the sub-pixel SP but is patterned separately from the first electrode 150 and spaced apart from the first electrode 150 .

[0132] The electrode contact hole CH and the dummy hole DH may be covered and filled with a light shielding pattern 170 having a light shielding property.

[0133] The light shielding pattern 170 may be formed using a black light shielding material (eg, black resin).

[0134] When the light shielding pattern 170 is formed at the electrode contact hole CH and the dummy hole DH, light leakage of color light of each sub-pixel SP into its adjacent sub-pixel SP may be prevented, and undesired color mixing may be prevented.

[0135] In this regard, in the arrangement of the present embodiment, the sub-pixels SP are arranged so that each sub-pixel SP and four sub-pixels SP disposed diagonally to each sub-pixel SP are different in color. In this case, two electrode contact holes CH and two dummy holes DH may be disposed in four directions diagonally to each sub-pixel SP, and a light shielding pattern 170 may be formed at each of the two electrode contact holes CH and the two dummy holes DH.

[0136] In other words, for each sub-pixel SP (or for each emission area EA), two electrode contact holes CH and two dummy holes DH may be respectively located at four separate areas between four reflective structures RS surrounding each sub-pixel SP.

[0137] Therefore, the color light of each sub-pixel SP may be prevented from entering the adjacent sub-pixel SP through the light shielding pattern 170 disposed diagonally to each sub-pixel SP.

[0138] As described above, since the electrode contact hole CH and the dummy hole DH having a structure corresponding to the electrode contact hole CH are formed, light leakage from each sub-pixel SP to its adjacent sub-pixel SP may be effectively prevented.

[0139] In addition, the electrode extension portion 153 located in the non-emission area NEA having the dummy hole DH may not be formed in the dummy hole DH. Alternatively, similar to the electrode contact hole CH, the electrode extension portion 153 may be formed in the dummy hole DH. In the present embodiment, it is shown by way of example that the electrode extension portion 153 is not formed in the dummy hole DH.

[0140] On the substrate 101 having the reflective structure RS, the first electrode 150, and the shielding pattern 170, a bank 175 defining an emission area EA of each sub-pixel SP may be formed.

[0141] The bank 175 may be formed at an edge (or boundary) of each sub-pixel SP and serve as a partition wall to separate (or divide) the sub-pixels SP (or emission areas EA) from each other. The bank 175 may include an opening 176 exposing a portion of the first electrode 150 of each sub-pixel SP.

[0142] A large amount of light emission through the organic light emitting layer may be generated at a portion of the first electrode 150 exposed through the opening 176. Therefore, a region of the exposed portion of the first electrode may be substantially defined as an emission area EA.

[0143] The bank 175 may be formed to cover the edge region except the emission region EA in each sub-pixel SP. In addition, the bank 175 may be formed to cover the non-emission region NEA surrounded by the sub-pixel SP. The edge region of each sub-pixel SP may be a region that does not emit light and is considered a non-emission region.

[0144] In the present embodiment, the bank 175 of the present embodiment may be formed of an inorganic insulating material and / or an organic insulating material having a transparent property so that light is transmitted from the sub-pixel SP to its adjacent non-emission area NEA.

[0145] At the opening 176 of each sub-pixel SP, an organic insulating layer emitting color light of each sub-pixel SP may be formed on the exposed portion of the first electrode 150. For example, a first organic light-emitting layer 180a, a second organic light-emitting layer 180b, and a third organic light-emitting layer 180c emitting red (R), blue (B), and green (G) light may be formed in the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3, respectively.

[0146] The first, second, and third organic light emitting layers 180a, 180b, and 180c may include first, second, and third emission material layers 181a, 181b, and 181c that generate red (R), blue (B), and green (G) light, respectively.

[0147] Each of the first, second, and third emission material layers 181a, 181b, and 181c may be formed in the opening 176 of the corresponding sub-pixel SP using, for example, a fine metal mask (FMM) method. Alternatively, each emission material layer may be formed using other methods including a soluble process method.

[0148] Regarding the FMM method, for example, a red first emission material can be deposited using an FMM mask having an opening corresponding to the first sub-pixel SP1 to form a first emission material layer 181a. In a similar manner, a second emission material layer 181b and a third emission material layer 181c can be formed at the second sub-pixel SP2 and the third sub-pixel SP3, respectively, using an FMM mask.

[0149] When the emission material layers 181a, 181b, and 181c are formed by the FMM method, there may be a limitation on resolution due to the nature of the method, and thus grid recognition may occur. Thus, the reflective structure RS may be effective in improving the performance of an organic light emitting display device manufactured using an FMM mask.

[0150] On the substrate 101 having the organic light emitting layer, the second electrode 185 as the upper electrode of the light emitting diode OD may be completely formed. The second electrode 185 may be formed in the opening 176 and on the bank 175.

[0151] One of the first electrode 150 and the second electrode 185 may function as an anode, and the other of the first electrode 150 and the second electrode 185 may function as a cathode. In the present embodiment, the first electrode 150 functioning as an anode and the second electrode 185 functioning as a cathode are described by way of example.

[0152] The organic light emitting layer of each sub-pixel SP may further include a charge transfer layer as an organic material layer, which is located below and above the emission material layer and improves the transfer (e.g., injection, transport, etc.) of holes and electrons from the first electrode 150 and the second electrode 185 to the emission material layer. For example, a first charge transfer layer 182 may be formed below each emission material layer to improve the transfer of holes, and a second charge transfer layer 183 may be formed on each emission material layer to improve the transfer of electrons. The first charge transfer layer 182 may include, for example, a hole injection layer, a hole transport layer, etc. The second charge transfer layer 183 may include, for example, an electron injection layer, an electron transport layer, etc.

[0153] The first charge transfer layer 182 and the second charge transfer layer 183 may be formed completely above the substrate 101. In other words, the first charge transfer layer 182 and the second charge transfer layer 183 may be formed in the opening 176 and on the bank 175. For the organic light emitting layer of each sub-pixel SP, an emission stack unit having the first charge transfer layer 182 and the second charge transfer layer 183 and an emission material layer therebetween, or a plurality of stacked emission stack units may be formed. In other words, the organic light emitting layer may be configured as a single-stacked emission stack structure or a multi-stacked emission stack structure.

[0154] The second electrode 185 may be formed of a transparent conductive material such as ITO, IZO, etc. and have a transparent property. Therefore, light propagating upward through the emission area EA in each sub-pixel SP may pass through the second electrode 185 and be output to the outside.

[0155] In the present embodiment, in order to effectively guide the light generated at the sub-pixel SP to the reflective structure RS located at one side of the sub-pixel SP, a reflective pattern 195 may be formed. The reflective pattern 195 may be a preferred component for improving the effect of the function of guiding the light to the reflective structure RS. However, the reflective pattern 195 may not be necessary and may not be adopted.

[0156] The reflective pattern 195 may be formed on a top surface of the bank 175 and below the second electrode 185 and the charge transfer layers 182 and 183 .

[0157] The reflective pattern 195 and the electrode extension portion 153, each having a reflective property and facing each other, may be respectively located on and below the bank 175 to form a light guide structure along the lateral direction. Therefore, light laterally emitted from the sub-pixel SP may be effectively transmitted to the reflective structure RS along the bank 175 by a light guiding function through reflection of the reflective pattern 195 and the electrode extension portion 153.

[0158] A through hole 196 may be formed in the reflective pattern 195 above the reflective structure RS to output reflected light. Considering efficient output of light through the through hole 196, the area of ​​the through hole 196 may be equal to or greater than the area of ​​the reflective structure RS.

[0159] Therefore, the light of the sub-pixel SP may be reflected on the corresponding reflective side surface RSS of the reflective structure RS, then pass through the through hole 196, and then be output upward.

[0160] In the present embodiment, the light shielding layer 197 may be formed on the reflective pattern 195. The light shielding layer 197 may be formed under the second electrode 185 and the charge transfer layers 182 and 183. The light shielding layer 197 may be formed using a black light shielding material.

[0161] Therefore, light emitted from the emission area EA in an oblique direction and laterally propagating by total reflection on the top surface of the second electrode 185 and reflection on the reflective pattern 195 may be shielded. Therefore, undesirable color mixing may be prevented.

[0162] The light shielding layer 197 may be formed to have the same shape in a plane as the reflective pattern 195. The light shielding layer 197 together with the reflective pattern 195 may have a through hole 196 corresponding to the reflective structure RS.

[0163] Although not shown in the drawings, an encapsulation layer may be formed on the second electrode 185 to encapsulate the organic light emitting display device. The encapsulation layer may be formed entirely over the substrate 101. The encapsulation layer may block penetration of moisture and / or air from the outside and improve reliability.

[0164] <Second Embodiment>

[0165] Fig.12 is a cross-sectional view showing an organic light emitting display device according to a second embodiment of the present invention. Fig.12 Shown with Figure 6 The part corresponding to the part shown.

[0166] Description of the same or similar parts as those of the first embodiment may be omitted.

[0167] refer to Fig.12 The organic light emitting display device 10 of the present embodiment may be a display device having a structure that can realize a microcavity effect (ie, having a microcavity structure). The microcavity structure can improve color purity and light output efficiency through constructive interference of light.

[0168] In the microcavity structure, the second electrode 185 as the upper electrode of the light emitting diode OD may be formed to have a semi-transparent property.

[0169] In this case, in each sub-pixel SP, the color light reflected and constructively interfered between the first electrode 150 and the second electrode 185 located below and above the organic light emitting layer may pass through the translucent second electrode 185 and be output upward. Each sub-pixel SP may be disposed so that the distance between the first electrode 150 and the second electrode 185 (i.e., the cavity thickness) corresponds to the color wavelength of each sub-pixel SP.

[0170] The second electrode 185 may be formed of a metal, for example, Mg, Ag, or an alloy of Mg and Ag.

[0171] In the microcavity structure, the second electrode 185 may have a semi-transparent property, that is, both a reflective property and a transparent property.

[0172] Therefore, instead of the reflection pattern ( Figure 6 195), a translucent second electrode 185 that can be formed substantially over the entire surface of the substrate 101 can be used to laterally guide light.

[0173] In this regard, the translucent second electrode 185 and the reflective electrode extension portion 153 facing each other may be respectively located on and below the bank 175 to form a light guide structure along the lateral direction. Therefore, light laterally emitted from the sub-pixel SP may be sufficiently transmitted to the reflective structure RS along the bank 175 by a light guiding function through reflection of the second electrode 185 and the electrode extension portion 153.

[0174] A through hole 186 may be formed in the second electrode 185 above the reflective structure RS to output reflected light. Considering efficient output of light through the through hole 186, the area of ​​the through hole 186 may be equal to or greater than the area of ​​the reflective structure RS.

[0175] Therefore, the light of the sub-pixel SP may be reflected on the corresponding reflective side surface RSS of the reflective structure RS, then pass through the through hole 186, and then be output upward.

[0176] As described above, in the present embodiment, there is no reflective pattern of the first embodiment, and there is an advantage that the semi-transparent second electrode 185 can be used as a light guiding member.

[0177] <Third Embodiment>

[0178] Fig.13 is a cross-sectional view showing an organic light emitting display device according to a third embodiment of the present invention. Fig.13 Shown with Figure 6 The part corresponding to the part shown.

[0179] Description of the same or similar parts of the first and second embodiments may be omitted.

[0180] refer to Fig.13 In the organic light-emitting display device 10 of the present embodiment, the first height (or first thickness) h1 as the height (or thickness) of the reflective structure RS may be greater than the second height (or second thickness) h2 as the height (or thickness) of the embankment 175 .

[0181] In other words, the reflective structure RS may have a portion protruding upward from the top surface of the bank 175 .

[0182] When the reflective structure RS is formed to be higher than the bank 175 , lateral leakage of light through the bank 175 may be effectively prevented.

[0183] In this regard, when the reflective structure RS is lower than the bank 175 as in the first embodiment, light may pass through a portion between the reflective structure RS and the top surface of the bank 175 and leak.

[0184] In the present embodiment, since the reflective structure RS is higher than the bank 175 , light leakage through a portion between the reflective structure RS and a top surface of the bank 175 may be prevented.

[0185] In this embodiment, for the purpose of explanation, a display device similar to the first embodiment having a transparent second electrode 185 is shown by way of example. Alternatively, the above configuration of the reflective structure RS may be applied to a display device similar to the second embodiment having a semi-transparent second electrode.

[0186] <Fourth Embodiment>

[0187] Fig.14 FIG. 4 is a plan view schematically showing a plan structure of an organic light emitting display device according to a fourth embodiment of the present invention.

[0188] Description of the same or similar parts of the first to third embodiments may be omitted.

[0189] refer to Fig.14 In the organic light emitting display device 10 of the present embodiment, the sub-pixels SP may be arranged in a manner different from that of the first to third embodiments. For example, the sub-pixels SP may be arranged in a triangle arrangement.

[0190] The emission area EA of each sub-pixel SP may be in various planar shapes. Fig.14 As shown, the emission area EA may have, but is not limited to, a triangular shape.

[0191] Regarding the delta arrangement, three sub-pixels SP adjacent to each other, for example, a first sub-pixel SP1 of red (R), a second sub-pixel SP2 of blue (B), and a third sub-pixel SP3 of green (G) may form a delta arrangement unit.

[0192] In this regard, in one of the odd-numbered row lines and the even-numbered row lines as two adjacent row lines, for example, in the odd-numbered row lines, the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 may be arranged alternately, and in the even-numbered row lines, the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 may be arranged. In addition, the sub-pixels SP in the odd-numbered row lines may be arranged in a direction diagonal to the sub-pixels SP in the even-numbered row lines, and the sub-pixels SP in the even-numbered row lines are different in color from the sub-pixels SP in the odd-numbered row lines. In other words, in two adjacent row lines, the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 may be arranged in a zigzag form along the row direction.

[0193] In addition, in each column line, sub-pixels SP of the same color may be arranged. For example, the first sub-pixel SP1, the second sub-pixel SP2, and the third sub-pixel SP3 may be arranged in three consecutive column lines, respectively. In addition, in two adjacent column lines, two sub-pixels SP with different colors may be arranged in a zigzag form along the column direction.

[0194] Since the sub-pixels SP can be arranged as above, a triangular arrangement unit can be defined, wherein the first sub-pixel SP1 to the third sub-pixel SP3 are respectively located at the three vertices of the triangle. In addition, the triangular arrangement unit can be repeatedly arranged in a plane, and adjacent arrangement units can be arranged to share a vertex therebetween. For example, adjacent arrangement units in the row direction can be arranged to share a sub-pixel SP therebetween, and adjacent arrangement units in the diagonal direction can be arranged to share a sub-pixel SP therebetween. Therefore, for each sub-pixel SP, three triangular arrangement units (i.e., the arrangement unit on the lower side, the arrangement unit on the upper left side, and the arrangement unit on the upper right side) can share each sub-pixel SP.

[0195] In the above-mentioned delta arrangement, the first to third sub-pixels SP1 to SP3 constituting the delta arrangement unit may form a pixel P as a unit for displaying a color image. In this case, adjacent pixels P may not share any sub-pixel SP. Fig.14 As shown, in two adjacent row lines as pixel array units, pixels P having first to third sub-pixels SP1 to SP3 arranged in a triangle and adjacent pixels P in the row direction having first to third sub-pixels SP1 to SP3 arranged in other triangles (i.e., inverted triangles, the direction of which is opposite to the triangle of the pixels P) may be alternately arranged in the row direction. In addition, pixels P having first to third sub-pixels SP1 to SP3 arranged in a triangle may be repeatedly arranged in the column direction.

[0196] As described above, in the delta arrangement, the number of the first sub-pixels SP1 , the number of the second sub-pixels SP2 , and the number of the third sub-pixels SP3 may be the same.

[0197] In the above-mentioned delta arrangement, as an inner area of ​​the delta arrangement unit, a non-emission area NEA surrounded by three sub-pixels SP forming the delta arrangement unit and having no light emitting element may be defined.

[0198] In other words, each non-emission area NEA may be configured to be surrounded by three sub-pixels SP1 to SP3 arranged in a triangle in two rows.

[0199] In the non-emission area NEA defined by its adjacent sub-pixels SP, a reflective structure RS may be disposed The reflective structure RS may have a polygonal pyramid shape (eg, a triangular pyramid shape) or a truncated polygonal pyramid shape (eg, a truncated triangular pyramid shape).

[0200] The reflective structure RS may include reflective side surfaces RSS respectively corresponding to the sub-pixels SP surrounding the reflective structure RS. In other words, in the reflective structure RS, the reflective side surfaces RSS may be arranged to face the three sub-pixels SP (ie, the emission areas EA of the three sub-pixels SP), respectively.

[0201] To improve reflection efficiency, each reflective side surface RSS may be configured to face the emission area EA of the sub-pixel SP directly in front thereof in a plan view.

[0202] In addition, the reflective side surface RSS may be configured to be inclined. In this regard, the reflective side surface RSS may be configured as an inclined surface inclined toward the inner side of the reflective structure RS in an upward direction.

[0203] By forming the reflective side surface RSS to be inclined, light laterally output from the corresponding sub-pixel SP may be reflected on the inclined reflective side surface RSS and then directly output upward to the front of the display device.

[0204] As such, the reflective side surface RSS may function as a light output portion that outputs light generated from a corresponding sub-pixel SP to a display surface.

[0205] Due to such reflection and output of light, an effect of planar expansion of the light output area of ​​the sub-pixel SP can be achieved.

[0206] Therefore, there may be an effect as if the distance between the sub-pixels SP of the same color is reduced, and thus the grid recognition may be reduced.

[0207] This can be further referenced Fig.15 . Fig.15 is a diagram schematically illustrating an area displaying red when the organic light emitting display device of the comparative example and the organic light emitting display device of the fourth embodiment each operate to display a single color (eg, red).

[0208] In the organic light emitting display device of the comparative example, no reflective structure is formed at the non-emission area NEA surrounded by the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 arranged in a triangle.

[0209] When the organic light emitting display device of the comparative example operates to display a single color of red, red light is output only at the emission area EA1 of the red sub-pixel SP1.

[0210] In the control example, the distance between adjacent areas showing the same color is as large as recognized by the viewer, and thus grid recognition occurs.

[0211] When the organic light emitting display device of this embodiment operates to display a single color of red, red light is output at the emission area EA1 of the red first subpixel SP1 and also output from the reflective side surface RSS of the reflective structure RS located at the non-emission area NEA adjacent to the emission area EA1.

[0212] Thus, in this embodiment, the output area of ​​the red light includes the emission area EA1 of the red first subpixel SP1, and can be extended to the corresponding reflection area of ​​the non-emission area NEA located in the lateral direction of the first subpixel SP1 (that is, the area of ​​the corresponding reflection side RSS of the reflection structure RS).

[0213] Compared with the control example, the distance between adjacent areas showing the same color can be reduced. Therefore, the grid recognition can be reduced by 2 times.

[0214] Therefore, grid recognition felt by the viewer can be significantly reduced.

[0215] In addition, by expanding the light output area of ​​the sub-pixel SP, when the organic light emitting display device is used as a virtual reality display device, the immersion feeling of virtual reality can be improved.

[0216] In addition, the non-emission region of the reflective structure RS is used as a light output region and acts as a display element like a sub-pixel SP. Therefore, there are effects of increased light transmittance and increased resolution.

[0217] Fig.16 is a diagram schematically illustrating an organic light emitting display device operating to display two colors according to a fourth embodiment of the present invention. Fig.17 is a diagram schematically illustrating an organic light emitting display device operating to display three colors according to a fourth embodiment of the present invention.

[0218] exist Fig.16 , the operation of displaying two colors (for example, red and blue) is shown by way of example. In this case, the emission area EA1 of the first sub-pixel SP1 outputs red light, and the emission area EA2 of the second sub-pixel SP outputs blue light. In addition, the red light and the blue light are output through the corresponding reflective side surfaces RSS of the reflective structure RS, which are located at the non-emitting area NEA adjacent to the first sub-pixel SP1 and the second sub-pixel SP2, and correspond to the first sub-pixel SP1 and the second sub-pixel SP2, respectively. In this way, in the case of an operation of displaying two colors, a color light that is a mixed (or combined) color light of the two color lights emitted is output and seen.

[0219] exist Fig.17, the operation of displaying three colors (for example, red, blue, and green) is shown by way of example. In this case, the emission areas EA1, EA2, and EA3 of the first subpixel SP1 to the third subpixel SP3 output red light, blue light, and green light. In addition, the red light, the blue light, and the green light are output through the corresponding reflective side surfaces RSS of the reflective structure RS, which are located at the non-emitting areas NEA adjacent to the first subpixel SP1 to the third subpixel SP3 and correspond to the first subpixel SP1 to the third subpixel SP3, respectively. In this way, in the case of the operation of displaying three colors, a color light that is a mixed (or combined) color light of the three color lights emitted is output and seen.

[0220] As in Figures 15 to 17 In the light emitting operation, the color of the light passing through the reflective structure RS may be changed according to a combination of emission states of the first to third sub-pixels SP1 to SP3 surrounding the reflective structure RS.

[0221] Return to reference Fig.14 In each sub-pixel SP, an electrode contact hole CH may be formed outside the emission area EA. Through the electrode contact hole CH, the first electrode of the light emitting diode OD of each sub-pixel SP may be electrically connected to the driving transistor of each sub-pixel SP.

[0222] The electrode contact holes CH of the sub-pixels SP may be formed in the same direction and at the same position. Fig.14 As shown, each electrode contact hole CH may be located at a corner of a lower left side of each emission area EA. The electrode contact hole CH may be filled with a light shielding pattern 170.

[0223] In the present embodiment using the delta arrangement, the organic light emitting display device 10 may not include any of the dummy holes of the first to third embodiments.

[0224] In the present embodiment, for each sub-pixel SP (or for each emission area EA), three electrode contact holes CH each having a light shielding pattern 170 therein may be respectively located at three separate regions between three reflective structures RS surrounding each sub-pixel SP. Therefore, light leakage of the color light of each sub-pixel SP into its adjacent sub-pixel SP may be prevented, and undesirable color mixing may be prevented.

[0225] The structure of each sub-pixel PS and the structure of the non-emission area NEA having the reflective structure RS may be similar to those of the first, second, or third embodiment.

[0226] For example, similar to the first embodiment, the second electrode may be transparent, a reflective pattern may be formed on the top surface of the bank, and a light shielding layer may be formed on the reflective pattern.

[0227] Furthermore, similar to the second embodiment, the second electrode may be semi-transparent, and the reflective pattern may not be formed in the display device.

[0228] Furthermore, similar to the third embodiment, the reflective structure may be formed to be higher than the bank and may protrude upward from the bank.

[0229] According to the above-described embodiment, the reflective structure is located in a non-emission region surrounded by a sub-pixel adjacent to the reflective structure, and includes a reflective side surface facing the emission region of the sub-pixel.

[0230] Since the reflective structure is used to reflect and output light incident on the reflective side surface, the area of ​​light output of the sub-pixel can be expanded substantially in a plane.

[0231] Therefore, there is an effect as if the distance between sub-pixels of the same color is reduced, and thus grid recognition can be reduced.

[0232] In addition, due to the expansion of the light output area of ​​the sub-pixel, when the organic light emitting display device is applied to a virtual reality display device, the immersion of the virtual reality can be improved.

[0233] In addition, the non-emission area where the reflective structure is located serves as a light output area and acts as a display element like a sub-pixel. Therefore, there is an effect of increasing resolution.

[0234] It is obvious to those skilled in the art that various modifications and variations can be made to the display device of the present invention without departing from the spirit or scope of the present disclosure. Therefore, the present invention is intended to cover modifications and variations of the present disclosure as long as they are within the scope of the attached claims and their equivalents.

Claims

1. An organic light emitting display device, comprising: Light emitting diodes, respectively located in the first to third sub-pixels on the substrate, and emitting light passing through emission areas of the first to third sub-pixels respectively; a reflective structure located in a non-emitting area surrounded by the first to third sub-pixels and comprising a reflective side surface, the reflective side surface being inclined and facing the emitting areas of the first to third sub-pixels, respectively; as well as a bank formed at the non-emission region and including openings defining the emission regions of the first to third sub-pixels, respectively, Wherein, the light emitting diode comprises: a first electrode having a reflective property, exposed through the opening, and including an electrode extension portion located below the bank and extending to the non-emitting region; an organic light-emitting layer, which is located on the first electrode; and A second electrode is located on the organic light-emitting layer. wherein the second electrode is located on the bank and is transparent, and Wherein, the reflective pattern is formed on the bank and includes a through hole corresponding to the reflective structure.

2. The display device according to claim 1, in, The reflective structure includes a protruding pattern having a cone shape and protruding upward, and a reflective portion covering the protruding pattern, and The reflective portion is a portion of an electrode extension portion of the first electrode included in one of the first to third sub-pixels.

3. The display device according to claim 1, wherein: The light shielding layer is formed on the reflective pattern and includes the through holes corresponding to the reflective structure.

4. The display device according to claim 1, wherein: The reflective structure has a height greater than a height of the bank.

5. The display device according to claim 1, wherein: The first to third sub-pixels respectively emit red light, green light, and blue light which are output upward through the emission areas of the first to third sub-pixels, and The first to third sub-pixels are arranged in a diamond pixel arrangement or a triangle pixel arrangement.

6. The display device according to claim 5, wherein: When the first to third sub-pixels are arranged in a diamond pixel arrangement, the non-emission area is surrounded by the first and second sub-pixels disposed opposite to each other and the two third sub-pixels disposed opposite to each other.

7. The display device according to claim 5, wherein: When the first to third sub-pixels are arranged in a triangle arrangement, the non-emission area is surrounded by the first to third sub-pixels forming a triangle.

8. The display device according to claim 5, further comprising: a transistor in each of the first to third sub-pixels; as well as a passivation layer located between the transistor and the light emitting diode and comprising an electrode contact hole, through which the transistor is connected to the reflective first electrode of the light emitting diode, Wherein, the electrode contact hole is filled with a light shielding pattern.

9. The display device according to claim 8, wherein: The electrode contact hole is located at a corner on one side of the corresponding sub-pixel.

10. The display device according to claim 9, wherein: When the first to third sub-pixels are arranged in a diamond pixel arrangement, a dummy hole is formed in the passivation layer, the dummy hole is located at a corner on one side of the non-emitting area and is filled with another light shielding pattern, and The position of the dummy hole in the non-emitting area corresponds to the position of the electrode contact hole in the sub-pixel.

11. The display device according to claim 1, wherein: The color of light output through the reflective structure is consistent with a combination of emission states of the first to third sub-pixels.

12. The display device according to claim 1, wherein: The emission regions of the first to third sub-pixels have different areas.

13. The display device according to claim 1, wherein: The reflective side surfaces reflect upwardly light incident thereon from the corresponding emission areas.

14. An organic light emitting display device, comprising: Light emitting diodes, respectively located in the first to third sub-pixels on the substrate, and emitting light passing through emission areas of the first to third sub-pixels respectively; a reflective structure located in a non-emitting area surrounded by the first to third sub-pixels and comprising a reflective side surface, the reflective side surface being inclined and facing the emitting areas of the first to third sub-pixels, respectively; as well as a bank formed at the non-emission region and including openings defining the emission regions of the first to third sub-pixels, respectively, Wherein, the light emitting diode comprises: a first electrode having a reflective property, exposed through the opening, and including an electrode extension portion located below the bank and extending to the non-emitting region; an organic light-emitting layer, which is located on the first electrode; and A second electrode is located on the organic light-emitting layer. The second electrode is located on the bank, is semi-transparent, and includes a through hole corresponding to the reflective structure.

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