Organic light emitting display apparatus

Abstract

An organic light emitting display apparatus is provided, including a sub-pixel including a light emitting area; a planarization layer overlapping the light emitting area, the planarization layer including a plurality of light extraction patterns having a plurality of convex portions and a plurality of concave portions; a light control pattern alternately disposed in the concave portions of the plurality of light extraction patterns; and a light emitting element disposed above the plurality of light extraction patterns and the light control pattern.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2021-0157767, filed on November 16, 2021, which is incorporated herein by reference as fully set forth herein. Technical Field

[0003] This disclosure relates to organic light-emitting display devices, and more specifically, to an organic light-emitting display device that can reduce reflectivity attributable to external light while improving internal light extraction efficiency. Background Technology

[0004] With the advancement of the information age, the attention and demand for display devices used to display images have increased in various forms, leading to rapid development in the display field. Consequently, lightweight and thin flat panel display devices of various types have been developed and are attracting attention. Recently, display devices using technologies such as liquid crystal displays (LCDs) and organic light-emitting diode (OLEDs) have emerged.

[0005] Because organic light-emitting diode (OLED) displays are self-emissive devices that project images onto a display panel by emitting light through an organic light-emitting layer inserted between two electrodes, unlike liquid crystal displays (LCDs), they do not require a separate light source (e.g., a backlight unit), allowing them to be manufactured in a lightweight and thinner form. Furthermore, OLEDs have gained attention as a next-generation display device due to their low-voltage operation, offering advantages not only in power consumption but also in color reproduction, response speed, viewing angle, and contrast.

[0006] Organic light-emitting display devices display images by emitting internal light to the outside of the display device, and research is underway to improve the efficiency of internal light. However, since external light increases reflectivity, it is difficult to improve the efficiency of internal light, and research is also being conducted on reducing the visibility of reflections. Summary of the Invention

[0007] In view of the above problems, this disclosure is made, and the purpose of this disclosure is to provide an organic light-emitting display device that can improve light extraction efficiency by emitting light that might be trapped inside and not emitted to the outside when light is emitted from the organic light-emitting layer to display an image.

[0008] Another object of this disclosure is to provide an organic light-emitting display device that can solve black gaps or reflective visibility caused by external light reflection and can solve rainbow mura by preventing incident external light from being emitted after internal reflection or by preventing incident external light from being emitted due to increased reflectivity caused by reflective electrodes.

[0009] In addition to the purposes of this disclosure described above, other purposes and features of this disclosure will be clearly understood by those skilled in the art from the following description of this disclosure.

[0010] According to one aspect of this disclosure, the above and other objectives can be achieved by providing an organic light-emitting display device comprising: a sub-pixel including a light-emitting region; a planarization layer overlapping the light-emitting region, including a plurality of light extraction patterns having a plurality of protrusions and a plurality of recesses; a light control pattern alternately disposed in the recesses of the plurality of light extraction patterns; and a light-emitting element disposed above the plurality of light extraction patterns and the light control pattern.

[0011] According to one embodiment of this disclosure, the light control pattern can fill the recess to alternately flatten the upper surface of the recess.

[0012] According to one embodiment of this disclosure, the refractive index of the light control pattern can be greater than the refractive index of the planarization layer.

[0013] According to one embodiment of this disclosure, when the central portions of four adjacent recesses are connected to each other, two corners connected by lines can have different structures, and two corners not connected by lines can have the same symmetrical structure.

[0014] According to one embodiment of the present disclosure, the light-emitting element follows the surface shape of the light extraction pattern and the light control pattern, and is disposed above the inclined portion of the light extraction pattern. It has a concave shape in the recess of the light extraction pattern where no light control pattern is disposed, and a flat upper surface in the recess of the light extraction pattern where a light control pattern is disposed.

[0015] According to one embodiment of the present invention, the light-emitting element includes a first electrode, a light-emitting element layer, and a second electrode. The second electrode follows the surface shape of the light extraction pattern and the light control pattern, and is disposed above the inclined portion of the light extraction pattern. It also has a concave shape in the recess of the light extraction pattern where no light control pattern is disposed, and a flat upper surface in the recess of the light extraction pattern where the light control pattern is disposed.

[0016] According to one embodiment of this disclosure, external light entering the organic light-emitting display device from outside the device is reflected three times by the second electrode.

[0017] According to one embodiment of the present disclosure, the organic light-emitting display device may further include: a substrate disposed in the direction of light emission of the light-emitting element; a phase film attached to the substrate in the direction of light emission; and a polarizing film attached to the phase film in the direction of light emission. Attached Figure Description

[0018] The above and other objects, features and advantages of this disclosure will become more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 This is a view illustrating an organic light-emitting display device according to one embodiment of the present disclosure;

[0020] Figure 2 This is a view showing the planar structure of a unit pixel according to one embodiment of the present disclosure;

[0021] Figure 3 It is shown Figure 2 A cross-sectional view of the cross-sectional structure of a sub-pixel;

[0022] Figure 4 It shows the basis Figure 2 An enlarged plan view of part A of one embodiment;

[0023] Figure 5A It is along Figure 4 A cross-sectional view taken from line I-I'. Figure 5B It is along Figure 4 The cross-sectional view taken from line II-II', and Figure 5C It is along Figure 4 A cross-sectional view taken from line III-III';

[0024] Figure 6 It is shown Figure 2 An enlarged plan view of another example of part A;

[0025] Figure 7A It is along Figure 6 The cross-sectional view taken from line IV-IV', and Figure 7B It is along Figure 6 A cross-sectional view taken from line V-V';

[0026] Figure 8 This is a diagram illustrating the effect of an organic light-emitting display device according to this disclosure;

[0027] Figure 9A The photograph shows a comparative example, and Figure 9B Simulation data for the comparative examples are shown;

[0028] Figure 10 Simulated data of an organic light-emitting display device according to this disclosure are shown; and

[0029] Figure 11 This is a graph showing the light efficiency of an organic light-emitting display device according to this disclosure. Detailed Implementation

[0030] In the following description, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following embodiments are provided as examples so that the spirit of the present disclosure can be fully conveyed to those skilled in the art. Therefore, the present disclosure is not limited to the embodiments described below and may be implemented in other forms. In the drawings, for convenience, the dimensions and thickness of the device may be exaggerated. Where possible, the same reference numerals will be used throughout the drawings to refer to the same or similar parts. Furthermore, in the following description, detailed descriptions will be omitted where it is determined that such detailed descriptions of relevant known art unnecessarily obscure the subject matter of the present disclosure.

[0031] When using the terms “including,” “having,” and “containing” as described in this disclosure, another part may also exist unless “only” is used. Singular terms may include plural forms unless otherwise indicated.

[0032] When describing positional relationships, for example, when the positional relationship is described as 'above', 'on top of', 'below', and 'near', one or more other parts may be arranged between two other parts unless 'only' or 'directly' is used. Spatial relative terms, such as 'below', 'under', 'lower part', 'above', 'upper part', etc., may be used herein to readily describe the relationship between one or more elements as shown in the accompanying drawings and one or more other elements. It should be understood that these terms are intended to include different orientations of the device in addition to those shown in the accompanying drawings. For example, if the device in the accompanying drawings is inverted, a device described as 'below other devices' or 'below other devices' may be arranged 'above other devices'. Thus, the exemplary terms 'below' or 'under' can include a downward direction or both a downward and upward direction. Similarly, the exemplary terms 'above' or 'on top' can include an upward direction and a downward or lower direction.

[0033] In describing elements of this disclosure, the terms “first,” “second,” “A,” “B,” “(a),” “(b),” etc., may be used. These terms are intended to distinguish the corresponding element from other elements, and the basis, order, or number of the corresponding elements shall not be limited by these terms.

[0034] Features of various embodiments of this disclosure may be coupled or combined with each other in part or in whole, and may interoperate with each other and be technically driven in various ways, as will be fully understood by those skilled in the art. Embodiments of this disclosure may be performed independently of each other or may be performed together in an interdependent relationship.

[0035] In the following, an organic light-emitting display device according to the present disclosure will be described in detail with reference to the accompanying drawings and embodiments. Figure 1 This is a view illustrating an organic light-emitting display device according to one embodiment of the present disclosure.

[0036] Reference Figure 1 An organic light-emitting display device according to one embodiment of the present disclosure may include a display panel 10, which includes a substrate 100 and a counter substrate 300 bonded to each other.

[0037] The substrate 100 includes thin-film transistors and may be a transparent glass substrate or a transparent plastic substrate. The substrate 100 may include a display area AA and a non-display area IA.

[0038] The display area AA can be an area for displaying images, and can be a pixel array area, an active area, a pixel array unit, a display unit, or a screen. The display area AA can include multiple pixels P. The multiple pixels P can be actual light-emitting unit areas.

[0039] The non-display area IA can be an area where no image is displayed, and can be a peripheral circuit area, a signal supply area, a non-active area, or a border area. The non-display area IA can be configured to surround the display area AA. The display panel 10 or the substrate 100 may also include peripheral circuit units 50 disposed in the non-display area IA.

[0040] The opposing substrate 300 can be attached to the substrate 100 by an adhesive component (or a transparent adhesive), or it can be disposed on the substrate 100 by stacking organic or inorganic materials on top of the substrate 100. The opposing substrate 300 can be an upper substrate, a second substrate, or a packaging substrate, and can correspond to the components used to package the substrate 100.

[0041] Figure 2 This is a diagram illustrating a planar structure of a unit pixel according to one embodiment of the present disclosure. Figure 3 It is shown Figure 2 A cross-sectional view of the cross-sectional structure of a sub-pixel SP, and Figure 4 It shows the basis Figure 2 An enlarged plan view of part A of one embodiment.

[0042] Reference Figures 2 to 4 An organic light-emitting display device according to one embodiment of the present disclosure may include a plurality of unit pixels P, each unit pixel P being composed of a plurality of sub-pixels SP in a display area AA.

[0043] A subpixel SP may include a pixel region and a circuit region CA. The pixel region may include a light-emitting region EA. In the subpixel SP, the circuit region CA may be spatially separated from the light-emitting region EA. The light-emitting region EA is the region in the subpixel SP defined by the pixel region through the opening 190, and the circuit region CA may be a non-light-emitting region or a non-opening region.

[0044] A unit pixel P may include four sub-pixels SP. Sub-pixels SP may include red, white, blue, and green pixels. A gate line GL is configured to extend across the light-emitting region EA and the circuit region CA of the sub-pixel SP. Multiple data lines DL or reference lines RL are configured to extend across adjacent light-emitting regions EA or adjacent circuit regions CA, either between adjacent light-emitting regions EA or between adjacent circuit regions CA. A power line VDD extending in a direction parallel to the data lines DL is provided within a unit pixel P. The reference lines RL can be used as sensing lines for externally sensing characteristic changes of the driving thin-film transistors and / or the light-emitting element layer disposed in the circuit region CA during the sensing drive mode of the unit pixel P.

[0045] like Figure 3 As shown, the organic light-emitting display device according to this disclosure may include a substrate 100, a planarization layer 170 having a light extraction pattern 180, a light control pattern 175, a light-emitting element EP, and an optical film 120. The light-emitting element EP is driven by a driving thin-film transistor Tdr disposed between the substrate 100 and the planarization layer 170.

[0046] A buffer layer 110, a driving thin-film transistor (Tdr), a protective layer 130, a planarization layer 170, and a light-emitting element (EP) can be sequentially stacked on a first surface 100a of the substrate 100. An optical film 120 can be disposed on a second surface 100b of the substrate 100. The image is displayed in the direction of the second surface 100b of the substrate 100 to which the optical film 120 is attached. For example, the substrate 100 can be positioned in the direction of light emission of the light-emitting element EP, and the optical film 120 can be attached to the substrate in the direction of light emission.

[0047] The optical film 120 includes a phase film 123 and a polarizing film 125, with the phase film 123 disposed between the substrate 100 and the polarizing film 125. The optical film 120 may be configured to be attached to a second surface 100b of the substrate 100 by means of an adhesive material (not shown).

[0048] The polarizing film 125 can be formed as multiple layers stacked and attached to the phase film 123, and can change the direction of light transmission to a single direction. For example, the polarizing film 125 can change the phase by 90°. The phase film 123 can change the phase of the transmitted light by 45°.

[0049] A buffer layer 110 disposed on the first surface 100a of the substrate 100 may be disposed over the entire first surface 100a of the substrate 100. The buffer layer 110 may be used to prevent materials contained in the substrate 100 from diffusing into the thin-film transistor layer during the high-temperature process of manufacturing the thin-film transistor, or to prevent external water or moisture from penetrating into the light-emitting element. Optionally, depending on the situation, the buffer layer 110 may consist of multiple layers or be omitted.

[0050] A driving thin-film transistor Tdr is disposed in circuit region CA. The driving thin-film transistor Tdr may include an active layer 111, a gate insulating layer 113, a gate electrode 115, an interlayer insulating layer 117, a drain electrode 119d, and a source electrode 119s. Depending on the type of driving thin-film transistor Tdr, the drain electrode 119d and the source electrode 119s may be configured to be reversed.

[0051] The active layer 111 constituting the driving thin-film transistor Tdr can be made of a semiconductor material based on any one of amorphous silicon, polycrystalline silicon, oxide and organic materials.

[0052] The gate insulating layer 113 can be disposed in an island shape only on the channel region of the active layer 111, or it can be disposed entirely on the substrate 100 or the buffer layer 110 including the active layer 111.

[0053] The interlayer insulating layer 117 can be disposed above the gate electrode 115 and the active layer 111. The interlayer insulating layer 117 can be completely disposed in the circuit region CA and the light-emitting region EA. The interlayer insulating layer 117 can be made of inorganic materials, organic materials, or a combination thereof.

[0054] In the circuit region CA, a switching thin-film transistor and a capacitor may be disposed together with a driving thin-film transistor Tdr. A light-shielding layer 101 may also be disposed below the active layer 111 of at least one of the driving thin-film transistor Tdr or the switching thin-film transistor on the substrate 100.

[0055] A protective layer 130 may be disposed above the substrate 100 to cover the driving thin-film transistor Tdr. The protective layer 130 covers the drain electrode 119d and source electrode 119s of the driving thin-film transistor Tdr, as well as the interlayer insulating layer 117. The protective layer 130 may be completely disposed within the circuit region CA and the light-emitting region EA. The protective layer 130 may be described as a passivation layer.

[0056] The organic light-emitting display device according to this disclosure may further include a wavelength conversion layer 150 located on a first surface 100a of a substrate 100.

[0057] Wavelength conversion layer 150 may be disposed between substrate 100 and planarization layer 170 to overlap with at least one light-emitting region EA. Wavelength conversion layer 150 may be disposed between protective layer 130 and planarization layer 170 to overlap with light-emitting region EA. According to another example, wavelength conversion layer 150 may be disposed between interlayer insulating layer 117 and protective layer 130 or between substrate 100 and interlayer insulating layer 117 to overlap with light-emitting region EA.

[0058] The wavelength conversion layer 150 can have a wider dimension than the light-emitting region EA. Because the wavelength conversion layer 150 is wider than the light-emitting region EA, its size can be wider than the light extraction pattern 180 of the planarization layer 170. When the size of the wavelength conversion layer 150 is wider than the size of the light extraction pattern 180, internal light leakage to adjacent sub-pixels SP can be reduced.

[0059] The wavelength conversion layer 150 includes a color filter that transmits only the wavelength of light of a color specified for the sub-pixel SP from the light-emitting element EP emitted to the substrate 100. The wavelength conversion layer 150 can transmit red, green, or blue wavelengths. In the organic light-emitting display device according to this disclosure, when a unit pixel P includes first to fourth adjacent sub-pixels SP, the wavelength conversion layer 150 disposed in the first sub-pixel may include a red color filter, the wavelength conversion layer 150 disposed in the second sub-pixel may include a green color filter, and the wavelength conversion layer 150 disposed in the third sub-pixel may include a blue color filter. Because the wavelength conversion layer 150 is not disposed in the fourth sub-pixel, the fourth sub-pixel can emit white light.

[0060] The planarization layer 170 can be disposed above the substrate 100 and covered by the protective layer 130. When the protective layer 130 is omitted, the planarization layer 170 can be disposed above the substrate 100 and cover the driving thin-film transistor Tdr, the wavelength conversion layer 150, and various circuits. The planarization layer 170 can be completely disposed within the circuit region CA and the light-emitting region EA. Furthermore, the planarization layer 170 can be disposed within... Figure 1 The planarization layer 170 is positioned above the entire display area AA. It can be configured to extend to a non-display area that is relatively wider than the display area AA.

[0061] The planarization layer 170 can be made relatively thick to provide a flat surface on the display area AA. The planarization layer 170 can be made of organic materials such as photoacrylic acid, benzocyclobutene, polyimide, and fluoropolymers.

[0062] The planarization layer 170 may include a light extraction pattern 180 disposed in the pixel region PA. A portion of the light extraction pattern 180 may be disposed above the upper surface 170a of the planarization layer 170 to overlap with the light-emitting region EA of the pixel region. The light extraction pattern 180 is formed on the planarization layer 170 of the light-emitting region EA with a curved (or uneven) shape, thereby changing the movement path of light emitted from the light-emitting element EP to improve light extraction efficiency.

[0063] The light extraction pattern 180 includes a plurality of recesses 181 and a plurality of protrusions 183 located between the recesses 181, with the protrusions 183 and recesses 181 alternately arranged and connected. The plurality of recesses 181 of the light extraction pattern 180 are recessed based on the upper surface 170a of the planarization layer 170, but a plurality of protruding surfaces may be provided to connect in a lens-like manner in the direction toward the substrate 100. The plurality of recesses 181 may have the same depth based on the upper surface 170a of the planarization layer 170, but some of the plurality of recesses 181 may have different depths. Figure 3 As shown, the recess 181 is configured to extend through the thickness of the planarization layer 170, but not through the entire thickness of the planarization layer 170.

[0064] The light extraction pattern 180 can have a wider size than the size of the emitting region EA of the sub-pixel SP. When the size of the light extraction pattern 180 is wider than the size of the emitting region EA, the light efficiency in the emitting region EA can be further improved. The light extraction pattern 180 can be an uneven pattern, a microlens, or a light scattering pattern.

[0065] Reference Figures 4 to 5C According to one embodiment (Embodiment 1), each of the plurality of recesses 181 in an organic light-emitting display device can be arranged parallel to each interval of a light extraction pattern 180 along a first direction X, and can also be arranged along a second direction Y at each interval of the light extraction pattern 180. The light extraction pattern 180 can be arranged at predetermined intervals. Each of the plurality of recesses 181 can be arranged in a grid shape with predetermined intervals. Adjacent recesses 181 arranged along the first direction X can be connected to each other in a straight line, and adjacent recesses 181 arranged along the second direction Y can be connected to each other in a straight line.

[0066] The central portion of each of the four adjacent recesses 181 can form a square shape SS. Furthermore, each of the plurality of recesses 181 can be surrounded by eight recesses 181 arranged around it, in which case the shape of the central portions of the four adjacent recesses 181 connected sequentially can form a planar square shape. Although the recesses 181 shown in this disclosure have a planar appearance with a circular structure, the outer periphery of each of the plurality of recesses 181 can be arranged or configured as a honeycomb structure or a circular structure.

[0067] The spacing (or interval) between the recesses 181 respectively set in multiple sub-pixels SP can be the same or different from each other. In this case, the spacing between the recesses 181 can be the distance (or interval) between the center portions of two adjacent recesses 181.

[0068] The protrusion 183 can be disposed in the planarization layer 170 overlapping with the light-emitting region EA, having a shape that can maximize (e.g., increase) the external extraction efficiency of light generated in the sub-pixel SP based on the effective light-emitting region of the light-emitting element EP.

[0069] The protrusion 183 can alter the path of light emitted from the light-emitting element EP toward the light-emitting surface. According to one embodiment of this disclosure, the protrusion 183 alters the path of light emitted from the light-emitting element EP toward the substrate 100 to prevent or at least reduce light emitted from the light-emitting element EP from being trapped therein, thereby emitting light to the outside and thus improving light extraction efficiency.

[0070] The protrusion 183 can be implemented around each of a plurality of recesses 181. The plurality of protrusions 183 surrounding a recess 181 can be connected to form a honeycomb shape.

[0071] The protrusion 183 can be formed to be connected to each other among a plurality of recesses 181. The upper portion of the protrusion 183 may include having, for example, Figures 5A to 5C The dome or bell-shaped structure with a convex cross-section is shown, but is not limited to this. The inclined portion between the convex portion 183 and the concave portion 181 may have a curved shape. The inclined portion between the convex portion 183 and the concave portion 181 may have a tangent slope that gradually increases and then gradually decreases from the bottom of the concave portion 181 to the top of the convex portion 183.

[0072] like Figure 3 As shown, a light control pattern 175 is disposed above the light extraction pattern 180 of the planarization layer 170 and within a recess 181 of the light extraction pattern 180. The light control pattern 175 is configured in multiple ways to alternately planarize the upper surface of the recess 181 by alternately filling it with the light extraction pattern 180. Therefore, a subset of the recesses 181 are filled with the light control pattern 175. The light control pattern 175 is made of an organic material with a refractive index higher than that of the planarization layer 170. The refractive index of the light control pattern 175 can be 1.57 or greater. The light control pattern 175 can be made of a transparent material and can have a transmittance of 90% or higher. The light control pattern 175 may include particles. The light control pattern 175 can control the linear directionality of light by refracting internal light.

[0073] like Figure 4As shown, light control patterns 175 can be alternately disposed in adjacent recesses 181 of light extraction patterns 180, such that light control patterns 175 can be spaced apart from each other in at least one direction. For example, two light control patterns 175 are spaced apart from each other in at least one direction, wherein the protrusions 183, recesses 181, and protrusions 183 of light extraction patterns 180 are located between the two light control patterns 175.

[0074] The central portions of four adjacent recesses 181 can be connected to each other to form a square shape SS, and the two corners connected by the lines of the square shape SS have their own distinct structures, while the two corners not connected by lines have the same symmetrical structure.

[0075] The light control pattern 175 is disposed in one of the recesses 181 at two corners of the square SS that are connected by a straight line and face each other, but not in the other recess 181. The light control pattern 175 may be disposed above the two recesses 181 at the two corners of the square SS that face each other based on the diagonal direction, or the light control pattern 175 may not be disposed above the two recesses 181 at the two corners that face each other based on the diagonal direction opposite to that diagonal direction. In this case, the light control pattern 175 may be alternately disposed in the recesses 181 of the light extraction pattern 180.

[0076] like Figures 5A to 5C As shown, the light control pattern 175 fills the recess 181 between two protrusions 183 of the light extraction pattern 180 in the first direction X to flatten the recess 181, but it is not provided in the recess 181 immediately adjacent to the recess 181 filled by the light control pattern 175. For example, the light control pattern 175 in one row in the first direction X does not overlap with the light control pattern 175 in the next row or adjacent row in the first direction X. The recess 181 filled with the light control pattern 175 in one row in the first direction X is provided to overlap with the recess 181 in the next row or adjacent row in the first direction X that is not filled with the light control pattern 175.

[0077] like Figures 5A to 5C As shown, the light control pattern 175 fills the recess 181 between two protrusions 183 of the light extraction pattern 180 in the second direction Y to flatten the recess 181, but is not provided in the recess 181 immediately adjacent to the recess 181 filled by the light control pattern. For example, the light control pattern 175 in a column in the second direction Y does not overlap with the light control pattern 175 in the next column or adjacent column in the second direction Y (e.g., they do not overlap). The column of recesses 181 filled with the light control pattern 175 in the second direction Y is configured to overlap with the recesses 181 in the next column or adjacent column in the second direction Y that are not filled with the light control pattern 175.

[0078] When the recesses 181 of four adjacent light extraction patterns 180 are symmetrical about each other along the diagonal direction, the light control pattern 175 is disposed in the recess 181 in one diagonal direction but not in the recess 181 in the other diagonal direction. In this case, the light control pattern 175 can be disposed alternately in the recesses 181 of the light extraction pattern 180.

[0079] Figure 6 This is a plan view illustrating another embodiment. (Refer to...) Figures 6 to 7B According to another embodiment (Embodiment 2) of the present disclosure, the planarization layer 270 of the organic light-emitting display device may include a light extraction pattern 280 disposed in a pixel region according to another embodiment of the present disclosure. A portion of the light extraction pattern 280 is configured to overlap with the light-emitting region EA of the pixel region to change the movement path of light emitted from the light-emitting element EP, thereby improving the light extraction efficiency.

[0080] The light extraction pattern 280 includes a plurality of recesses 281 and a plurality of protrusions 283 between the plurality of recesses 281. The plurality of protrusions 283 and the plurality of recesses 281 are alternately arranged to connect with each other. The plurality of recesses 281 may have the same depth based on the upper surface of the planarization layer 270, but some of the plurality of recesses 281 may have different depths.

[0081] The light extraction pattern 280 can have a wider size than the size of the emitting region EA of the sub-pixel SP. When the size of the light extraction pattern 280 is wider than the size of the emitting region EA, the light efficiency in the emitting region EA can be further improved. The light extraction pattern 280 can be an uneven pattern, a microlens, or a light scattering pattern.

[0082] A plurality of recesses 281 may be spaced parallel to each other along a first direction X to have a predetermined gap between them, and may be arranged at each interval of the light extraction pattern 280 along a second direction Y. The light extraction pattern 280 may be arranged at predetermined intervals. Each of the plurality of recesses 281 may be arranged as a rhomboid or diamond shape (DS) with a predetermined interval. Adjacent recesses 281 arranged along the second direction Y may be connected to each other in a zigzag shape, and adjacent recesses 281 arranged along the first direction X may be connected to each other in a straight line.

[0083] The central portion of each of the four adjacent recesses 281 can be formed into a square shape, a rhomboid shape, or a diamond shape DS. Furthermore, each of the plurality of recesses 281 can be surrounded by recesses 281 of six light extraction patterns 280 disposed around it. In this case, the central portion of each of the six recesses 281 surrounding a recess 281 can have a planar hexagonal shape. Although the light extraction patterns 280 of the recesses 281 shown in this disclosure are shown in a circular structure, the outer periphery of the light extraction patterns 280 of each of the plurality of recesses 281 can be configured or arranged in a honeycomb structure or a circular structure.

[0084] The spacing (or interval) between the recesses 281 respectively set in multiple sub-pixels SP can be the same or different from each other. In this case, the spacing between the recesses 281 can be the distance (or interval) between the center portions of two adjacent recesses 281.

[0085] The protrusion 283 can be disposed in the planarization layer 270 overlapping with the light-emitting region EA, having a shape that maximizes the external extraction efficiency of light generated in the sub-pixel SP based on the effective light-emitting region of the light-emitting element EP.

[0086] The protrusion 283 can alter the path of light emitted from the light-emitting element EP toward the light-emitting surface. According to one embodiment of this disclosure, the protrusion 283 alters the path of light emitted from the light-emitting element EP toward the substrate 100 to prevent light emitted from the light-emitting element EP from being trapped therein, thereby emitting the light to the outside and improving light extraction efficiency.

[0087] The plurality of protrusions 283 can be implemented around each of the plurality of recesses 281. The plurality of protrusions 183 surrounding a recess 281 can be connected to form a honeycomb shape.

[0088] The protrusion 283 can be formed to be connected to each other among a plurality of recesses 281. The upper portion of the protrusion 283 may include having, for example, Figure 7A and Figure 7B The dome or bell-shaped structure with a convex cross-section is shown, but is not limited to this. The inclined portion between the convex portion 283 and the concave portion 281 may have a curved shape. The inclined portion between the convex portion 283 and the concave portion 281 may have a tangent slope that gradually increases and then gradually decreases from the bottom of the concave portion 281 to the top of the convex portion 283.

[0089] A light control pattern 275 is disposed above the light extraction pattern 280 of the planarization layer 270 and within a recess 281 of the light extraction pattern 280. Multiple light control patterns 275 are configured to alternately planarize the recesses 281 by alternately filling them. The light control pattern 275 is made of an organic material with a refractive index higher than that of the planarization layer 270. The refractive index of the light control pattern 275 can be 1.57 or greater. The light control pattern 275 can be made of a transparent material and can have a transmittance of 90% or higher. The light control pattern 275 may include particles. The light control pattern 275 can control the linear directionality of light by refracting internal light.

[0090] like Figure 6 As shown, light control patterns 275 are alternately disposed in adjacent recesses 281 of light extraction pattern 280, these recesses 281 being adjacent to each other in at least one direction, such that the light control patterns 275 are spaced apart from each other in at least one direction. For example, two light control patterns 275 are spaced apart from each other in at least one direction, wherein the protrusions 283, recesses 281, and convexities 283 of light extraction pattern 280 are located between the two light control patterns 275.

[0091] The central portions of four adjacent recesses 281 can be connected to each other to form a rhomboid or diamond shape DS, and the two corners connected by the line of the rhomboid shape DS have their own distinct structures, while the two corners not connected by the line have the same symmetrical structure.

[0092] The light control pattern 275 is disposed in one of the recesses 281 at two opposite corners of the rhomboid shape DS connected by lines, but not in the other recess 281. The light control pattern 275 is disposed above the recesses 281 at two opposite corners of the rhomboid shape DS along diagonal directions, but not above the recesses 281 at two opposite corners along diagonal directions opposite to the rhomboid shape DS. In this case, the light control pattern 275 can be alternately disposed in the recesses 281 of the light extraction pattern 280.

[0093] The light control pattern 275 fills the recess 281 between the two protrusions 283 of the light extraction pattern 280 in the first direction X to flatten the recess 281, but it is not provided in the recess 281 immediately adjacent to the recess 281 filled by the light control pattern 275. At this time, as... Figure 6As shown, for example, the light control pattern 275 disposed in one row in the first direction X at least partially overlaps with the light control pattern 275 disposed in the next row or adjacent row in the first direction X. The recess 281 filled with the light control pattern 275 in one row in the first direction X is configured to at least partially overlap with the recess 281 not filled with the light control pattern 275 in the next row or adjacent row in the first direction X.

[0094] like Figure 7B As shown, the light control pattern 275 fills the recess 281 between the two protrusions 283 of the light extraction pattern 280 in the second direction Y to flatten the recess 281, but it is not provided in the recess 281 immediately adjacent to the recess 281 filled by the light control pattern 275. At this time, as Figure 6 As shown, for example, at least a portion of the light control pattern 275 disposed in a column in the second direction Y does not overlap with (e.g., does not overlap with) the light control pattern 275 disposed in the next column or adjacent column in the second direction Y. At least a portion of the recess 281 in a column in the second direction Y filled with the light control pattern 275 is configured to overlap with the recess 281 in the next column or adjacent column in the second direction Y that is not filled with the light control pattern 275.

[0095] When the recesses 281 of four adjacent light extraction patterns 280 are symmetrical about each other along the diagonal direction, the light control pattern 275 is disposed in the recess 281 in one diagonal direction but not in the recess 281 in the other diagonal direction. In this case, the light control pattern 275 can be disposed alternately in the recesses 281 of the light extraction pattern 280.

[0096] like Figure 3 As shown, the light-emitting element EP can be disposed above the light extraction pattern 180 of the light-emitting region EA, and emits light toward the substrate 100 according to the bottom light emission method. The light-emitting element EP is disposed along the surface shape (or morphology) of the light extraction pattern 180 and the light control pattern 175, such that the light-emitting element EP is disposed above the inclined portion of the light extraction pattern 180, and has a concave shape in the recess 181 of the light extraction pattern 180 where the light control pattern 175 is not disposed, and the light-emitting element EP has a cross-sectional structure with a flat upper surface in the recess 181 of the light extraction pattern 180 where the light control pattern 175 is disposed. Depending on the arrangement structure of the light control pattern 175, the light-emitting element EP may alternatively have a concave shape, a curved shape, or a planar shape.

[0097] According to one example, the light-emitting element EP may include a first electrode E1, a light-emitting element layer EDL, and a second electrode E2. The light-emitting element EP is also applicable to another embodiment shown. Figure 6 and Figure 7BThe implementation method is described in detail below, therefore its detailed description will be omitted. The following description will be used instead of the light-emitting element EP.

[0098] The first electrode E1 can be disposed above the planarization layer 170 on the pixel region and is therefore electrically connected to the drain electrode 119d of the driving thin-film transistor Tdr. One end of the first electrode E1 adjacent to the circuit region CA can be electrically connected to the drain electrode 119d of the driving thin-film transistor Tdr through the electrode contact hole CH disposed in the planarization layer 170 and the protective layer 130.

[0099] Since the first electrode E1 is in direct contact with the light extraction pattern 180 and the light control pattern 175, the first electrode E1 has a shape that follows the shape of the light extraction pattern 180 and the light control pattern 175. That is, the surface shape of the first electrode E1 substantially matches the shape of the light extraction pattern 180 and the light control pattern 175. Since the first electrode E1 is disposed (or deposited) on the planarization layer 170 and the light control pattern 175 with a relatively thin thickness, the first electrode E1 can have a shape that follows the light control pattern 175 and the light extraction pattern 180 including protrusions 183 and a plurality of recesses 181 (or a first shape) (or a second shape).

[0100] The first electrode E1 is configured to follow the surface shape (or morphology) of the light extraction pattern 180 and the light control pattern 175 through a transparent conductive material deposition process. This allows the first electrode E1 to follow the concave shape within the recess 181 of the light extraction pattern 180 where the light control pattern 175 is not present, and the first electrode E1 has a flat cross-sectional structure within the recess 181 of the light extraction pattern 180 where the light control pattern 175 is present. Depending on the arrangement of the light control pattern 175, the first electrode E1 may alternatively have a concave shape or a flat shape. In other words, the first electrode includes multiple portions disposed within the recesses 181 / 281 lacking the light control pattern 175, and multiple portions not disposed within the recesses 181 / 281 filled with the light control pattern 175.

[0101] The light-emitting element layer EDL can be disposed on the first electrode E1 and thus in direct contact with the first electrode E1. The light-emitting element layer EDL can be disposed (or deposited) on the first electrode E1 to be relatively thicker than the first electrode E1, such that the light-emitting element layer EDL can have a shape different from the shape of each of the protrusions 183 and the plurality of recesses 181, and can have a shape that follows the shape of the first electrode E1.

[0102] The light-emitting element layer (EDL) can be configured through a deposition process to follow the surface shape (or morphology) of the first electrode E1, such that the EDL follows the concave shape in the recess 181 of the light extraction pattern 180 where the light control pattern 175 is not disposed, and has a flat cross-sectional structure in the recess 181 of the light extraction pattern 180 where the light control pattern 175 is disposed. That is, the surface shape of the EDL substantially matches the shapes of the light extraction pattern 180 and the light control pattern 175. Depending on the arrangement of the light control pattern 175, the EDL alternately has concave and flat shapes. The EDL can also be configured through a deposition process to have a non-conformal shape that does not follow the surface shape (or morphology) of the first electrode E1, thereby having a cross-sectional structure different from that of the first electrode E1. That is, the EDL includes multiple portions disposed in the recesses 181 / 281 lacking the light control pattern 175, and multiple portions not disposed in the recesses 181 / 281 filled with the light control pattern 175.

[0103] The light-emitting element layer (EDL) can be configured to have a thickness that gradually increases towards the bottom surface of the recess 181 where the light control pattern 175 is not disposed. The EDL can be disposed with a first thickness on the inclined portion of the light extraction pattern 180 where the light control pattern 175 is not disposed, and can be disposed with a second thickness greater than the first thickness above the bottom surface of the recess 181 where the light control pattern 175 is disposed. The EDL can be disposed with a third thickness above the recess 181 of the light extraction pattern 180 where the light control pattern 175 is disposed, and the second and third thicknesses on the bottom surface of the recess 181 where the light control pattern 175 is not disposed can be the same. The first thickness of the EDL disposed above the inclined portion of the light extraction pattern 180 where the light control pattern 175 is not disposed can be less than the third thickness above the recess 181 of the light extraction pattern 180 where the light control pattern 175 is disposed.

[0104] The light-emitting element layer (EDL) includes two or more light-emitting layers for emitting white light. As an example, the EDL may include a first light-emitting layer and a second light-emitting layer for emitting white light by mixing a first light with a second light. The first light-emitting layer may include any one of a blue light-emitting layer, a green light-emitting layer, a red light-emitting layer, a yellow light-emitting layer, and a yellow-green light-emitting layer to emit the first light. The second light-emitting layer may include a light-emitting layer that emits a second light to achieve white light from the light-emitting element EP by mixing the first light with the blue, green, red, yellow, and yellow-green light-emitting layers. According to another example, the EDL may include any one of a blue light-emitting layer, a green light-emitting layer, and a red light-emitting layer.

[0105] The second electrode E2 can be disposed on the light-emitting element layer EDL and thus in direct contact with the light-emitting element layer EDL. The second electrode E2 can have a surface shape that follows the surface shape of the light-emitting element layer EDL. The second electrode E2 can be configured by a deposition process to conform to the surface shape (or morphology) of the light-emitting element layer EDL, so as to have the same cross-sectional structure as the light-emitting element layer EDL.

[0106] The second electrode E2 has a shape that follows the concave shape in the recess 181 of the light extraction pattern 180 where the light control pattern 175 is not provided, and a flat cross-sectional structure in the recess 181 of the light extraction pattern 180 where the light control pattern 175 is provided. That is, the surface shape of the second electrode E2 substantially matches the shapes of the light extraction pattern 180 and the light control pattern 175. Depending on the arrangement of the light control pattern 175, the second electrode E2 alternately has concave and flat shapes. In other words, the second electrode E2 includes multiple portions provided in the recesses 181 / 281 where the light control pattern 175 is absent, and multiple portions not provided in the recesses 181 / 281 filled with the light control pattern 175.

[0107] Since the second electrode E2 is disposed above the inclined portion of the light extraction pattern 180 where the light control pattern 175 is not disposed, and the second electrode E2 is disposed above the upper surface of the light control pattern 175 filling the recess 181 of the adjacent light extraction pattern 180, the light emitted from the light-emitting element layer EDL can be reflected by the second electrode E2 disposed above the inclined portion of the light extraction pattern 180 where the light control pattern 175 is not disposed, and will not dissipate after moving to the next light extraction pattern 180, even if it is refracted by the light control pattern 175.

[0108] The organic light-emitting display device according to this disclosure has light control patterns 175 alternately disposed in recesses 181 of a light extraction pattern 180, such that a second electrode E2 is disposed above an inclined portion of the light extraction pattern 180 to prevent light emitted from the interior from dissipating or being trapped after moving to the next light extraction pattern 180, and to cause light to be reflected internally and emitted externally, thereby improving light concentration efficiency to improve light extraction efficiency.

[0109] Furthermore, the organic light-emitting display device according to this disclosure has light control patterns 175 alternately disposed in recesses 181 of a light extraction pattern 180, such that a second electrode E2 is disposed above an inclined portion of the light extraction pattern 180 with a slope, and disposed above the recesses 181 to alternately have flat surfaces.

[0110] Since the second electrode E2 is sequentially disposed above the inclined portion of the light extraction pattern 180, the upper surface of the light control pattern 175 on the recess 181, and the inclined portion of the adjacent light extraction pattern 180, the incident external light can be reflected three times from the inclined portion of the light extraction pattern 180, the upper surface of the light control pattern 175 on the recess 181, and the inclined portion of the adjacent light extraction pattern 180.

[0111] When external light incident through the second electrode E2 is reflected three times internally, the organic light-emitting display device according to this disclosure can solve the visibility problem caused by reflection of external light because it can prevent the light from being emitted to the outside again. Therefore, the organic light-emitting display device can prevent black gaps caused by the reflection of external light, thereby achieving pure black in the non-driven or off state.

[0112] Since the organic light-emitting display device according to this disclosure can prevent external light from being emitted to the outside again, rainbow unevenness caused by the refraction of external light during emission can be avoided.

[0113] The second electrode E2 may include a metallic material with high reflectivity to reflect incident light emitted from the light-emitting element layer EDL back to the substrate 100. For example, the second electrode E2 may include a single-layer or multi-layer structure made of any one or an alloy of two or more materials selected from aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), magnesium (Mg), calcium (Ca), and barium (Ba). The second electrode E2 may also include an opaque conductive material with high reflectivity.

[0114] The organic light-emitting display device also includes a dam 190 for defining the light-emitting area EA and an encapsulation portion 200 for protecting the light-emitting element EP.

[0115] A dam layer 190 may be disposed above the edge of the first electrode E1 and on the planarization layer 170. A portion of the dam layer 190 may overlap with the edge portion of the wavelength conversion layer 150. The dam layer 190 may be made of an organic material such as a benzocyclobutene (BCB)-based resin, an acrylic resin, or a polyimide resin. The dam layer 190 may be configured as a photoresist comprising black pigment, and in this case, the dam layer 190 may serve as a light-shielding member between adjacent pixels.

[0116] A dam layer 190 is disposed above the upper surface 170a of the planarization layer 170 to cover the edge of the first electrode E1 extending onto the circuit region CA, and may be configured to cover the edge of the light extraction pattern 180. The light-emitting region EA defined by the dam layer 190 may be configured to have a narrower dimension than the region of the light extraction pattern 180 of the planarization layer 170.

[0117] The encapsulation portion 200 can be disposed above the substrate 100, covering the light-emitting element EP. The encapsulation portion 200 can surround the display area. The encapsulation portion 200 can be used to protect the thin-film transistor and the light-emitting element EP from external impacts and to prevent oxygen and / or moisture from penetrating into the light-emitting element EP.

[0118] The encapsulation portion 200 may include multiple inorganic encapsulation layers. The encapsulation portion 200 may also include at least one organic encapsulation layer interposed between the multiple inorganic encapsulation layers. The organic encapsulation layer may be represented by a particulate overlay layer.

[0119] According to another embodiment of this disclosure, the encapsulation portion can become a filler surrounding the display area, and in this case, the opposing substrate 300 can be bonded to the substrate 100 via the filler. The filler may include a getter material that absorbs oxygen and / or moisture.

[0120] The opposing substrate 300 can be coupled to the packaging portion 200. The opposing substrate 300 can be made of plastic, glass, or metal. For example, when the packaging portion 200 includes multiple inorganic packaging layers, the opposing substrate 300 can be omitted.

[0121] Alternatively, when the encapsulation section 200 is replaced with a filler, the opposing substrate 300 can be coupled to the filler, and in this case, the opposing substrate 300 can be made of plastic, glass or metal.

[0122] Figure 8 This is a view illustrating the effect of an organic light-emitting display device according to this disclosure.

[0123] When external light enters the organic light-emitting display device from outside, the external light is converted into left-handed or right-handed circularly polarized light through the optical film 120. Specifically, the external light becomes linearly polarized light when passing through the polarizing film 125, and the linearly polarized light is converted into left-handed or right-handed circularly polarized light through the phase film 123.

[0124] First, left-handed circularly polarized light will be described. The first left-handed circularly polarized light is reflected by the second electrode E2, which is disposed above the inclined portions of the light extraction patterns 180 and 280 where the light control patterns 175 and 275 are not disposed, and becomes first right-handed circularly polarized light. The first right-handed circularly polarized light is refracted by the light control patterns 175 and 275 disposed in the recesses 181 and 281 of the light extraction patterns 180 and 280, and is again reflected towards the light-emitting element EP by the flat second electrode E2 on the light control patterns 175 and 275, thereby transforming the first right-handed circularly polarized light into second left-handed circularly polarized light.

[0125] At this time, since the refractive index of the light control patterns 175 and 275 is greater than that of the planarization layers 170 and 270 with light extraction patterns 180 and 280, the emission angle θ2 is smaller than the incident angle θ1. Therefore, the first right-hand circularly polarized light is guided into the direction of the light-emitting element EP by the second electrode E2 disposed above the inclined portion of the light extraction patterns 180 and 280 where the light control patterns 175 and 275 are not disposed. The first right-hand circularly polarized light is again reflected by the planar second electrode E2 on the light control patterns 175 and 275 and becomes the second left-hand circularly polarized light.

[0126] The second left-hand circularly polarized light is refracted again by the light control patterns 175 and 275 and reflected by the second electrode E2, which is disposed above the inclined portion of the adjacent light extraction patterns 180 and 280. Since the light control patterns 175 and 275 are not disposed in the adjacent light extraction patterns 180 and 280, the second left-hand circularly polarized light becomes the second right-hand circularly polarized light and is guided toward the substrate 100.

[0127] At this time, since the refractive index of the light control patterns 175 and 275 is greater than the refractive index of the planarization layers 170 and 270 with light extraction patterns 180 and 280, when the light in the light control patterns 175 and 275 passes through the adjacent light extraction patterns 180 and 280, the emission angle θ2' is greater than the incident angle θ1'. Thus, the second left-handed circularly polarized light can be guided toward the tilted portion of the adjacent light extraction patterns 180 and 280, and is reflected by the second electrode E2 because no light control patterns 175 and 275 are provided in the adjacent light extraction patterns 180 and 280.

[0128] The second left-hand circularly polarized light is reflected by the second electrode E2 and becomes the second right-hand circularly polarized light. The phase of the light guided toward the substrate 100 is changed to 90° by the second right-hand circular polarization, so that the light can be prevented from being emitted to the outside by the polarizing film 125.

[0129] As another example, the case where external light becomes linearly polarized light as it passes through polarizing film 125, and the linearly polarized light becomes right-handed circularly polarized light as it passes through phase film 123, will be described. The first right-handed circularly polarized light is reflected by the second electrode E2 disposed above the inclined portions of light extraction patterns 180 and 280 where light control patterns 175 and 275 are not disposed, and becomes first left-handed circularly polarized light. The first left-handed circularly polarized light is refracted by light control patterns 175 and 275 disposed above the recesses 181 and 281 of light extraction patterns 180 and 280, and is again reflected towards the light-emitting element EP by the flat second electrode E2 on the light control patterns 175 and 275, and then becomes second right-handed circularly polarized light.

[0130] At this time, since the refractive index of the light control patterns 175 and 275 is greater than that of the planarization layers 170 and 270 with light extraction patterns 180 and 280, the emission angle θ2 is smaller than the incident angle θ1. Therefore, the first left-handed circularly polarized light is guided towards the light-emitting element EP by the second electrode E2 disposed above the inclined portion of the light extraction patterns 180 and 280 where the light control patterns 175 and 275 are not disposed. The first left-handed circularly polarized light is again reflected by the planar second electrode E2 on the light control patterns 175 and 275 and becomes the second right-handed circularly polarized light.

[0131] Because no light control patterns 175 and 275 are provided in the adjacent light extraction patterns 180 and 280, the second right-hand circularly polarized light is refracted again by the light control patterns 175 and 275, and is reflected again by the second electrode E2 provided above the inclined portion of the adjacent light extraction pattern 180, becoming the second left-hand circularly polarized light, and is guided toward the substrate 100.

[0132] At this time, since the refractive index of the light control patterns 175 and 275 is greater than the refractive index of the planarization layers 170 and 270 with light extraction patterns 180 and 280, when the light in the light control patterns 175 and 275 passes through the adjacent light extraction patterns 180 and 280, the emission angle θ2' is greater than the incident angle θ1'. As a result, the second right-hand circularly polarized light can be guided toward the tilted portion of the adjacent light extraction patterns 180 and 280, and is reflected by the second electrode E2 because no light control patterns 175 and 275 are provided in the adjacent light extraction patterns 180 and 280.

[0133] The second right-hand circularly polarized light is reflected again by the second electrode E2 and becomes the second left-hand circularly polarized light. The phase of the light guided towards the substrate 100 by the second left-hand circularly polarized light becomes 0° through the phase film 123, thereby preventing the light from being emitted to the outside through the polarization film 125.

[0134] As described above, in the organic light-emitting display device according to the present disclosure, the incident light and emitted light of the external light have different or opposite phases, such that the external light does not pass through the display device through the optical film 120 having the polarizing film 125, thereby preventing the external light from being emitted.

[0135] In the organic light-emitting display device according to this disclosure, light control patterns 175 and 275 are alternately disposed in the recesses 181 and 281 of light extraction patterns 180 and 280, such that incident external light is internally reflected three times through the second electrode E2 and prevented from being emitted, thereby solving the visibility problem caused by external light reflection. Therefore, the organic light-emitting display device can prevent black gaps caused by external light reflection, thereby achieving pure black in the non-driven or off state.

[0136] Light emitted from the light-emitting element EP in the organic light-emitting display device is emitted toward the substrate 100 or refracted by the light control patterns 175 and 275 filled in the recesses 181 and 281 of the light extraction patterns 180 and 280, and the refracted light is guided toward the adjacent light extraction patterns 180 and 280 or the substrate 100.

[0137] When refracted light is guided toward adjacent light extraction patterns 180 and 280, light control patterns 175 and 275 are not provided in the recesses 181 and 281 of adjacent light extraction patterns 180 and 280, so the second electrode E2 is positioned above the inclined portions of adjacent light extraction patterns 180 and 280. The light refracted by light control patterns 175 and 275 is reflected by the second electrode E2 positioned above the inclined portions of adjacent light extraction patterns 180 and 280, guided toward the substrate, and then emitted to the outside. In this case, since the light emitted from the light-emitting element EP is not polarized, its phase does not change even if the light is reflected by the second electrode E2, thus the light can be emitted to the outside without being blocked by the optical film 120.

[0138] In the organic light-emitting display device according to this disclosure, light control patterns 175 and 275 are alternately disposed in the recesses 181 and 281 of light extraction patterns 180 and 280, thereby preventing light emitted from the light-emitting element EP from dissipating or being trapped by moving to the next light extraction pattern 180 and 280, and allowing it to be reflected internally and emitted externally. As described above, the organic light-emitting display device according to this disclosure can improve light extraction efficiency by improving light-gathering efficiency.

[0139] like Figure 9A As shown, in the organic light-emitting display device according to the comparative example, external light is reflected inside the display device and refracted while being emitted to the outside of the display device, which may result in uneven rainbow colors. As a simulation result of the organic light-emitting display device according to the comparative example, a strong red brightness appears in the center and is distributed in a star shape, as shown... Figure 9B As shown. In this way, notice Figure 9B The simulation results are similar to those based on Figure 9A The photograph shows a comparative example of an organic light-emitting display device, which exhibits strong reflective visibility and rainbow inconsistency.

[0140] On the other hand, in the organic light-emitting display device according to this disclosure, as Figure 10The simulation results show a brightness distribution in the form of wide concentric circles, with no red in the center. In the organic light-emitting display device according to this disclosure, even if external light enters the display device, it prevents light from being emitted and instead reflects three times within the display device. Furthermore, it prevents brightness from being strongly concentrated only at the center and allows for a wide distribution in the form of concentric circles to reduce visual perception intensity. Therefore, in the organic light-emitting display device according to this disclosure, the visibility of reflections caused by external light can be resolved, and rainbow unevenness can be addressed.

[0141] As described above, in the organic light-emitting display device according to this disclosure, external light reflected internally can be prevented from being emitted, while light emitted from the organic light-emitting layer and trapped inside the organic light-emitting display device can be emitted to the outside. For example... Figure 11 As shown, compared with the organic light-emitting display device according to the comparative example, in the organic light-emitting display devices according to one embodiment (Embodiment 1) and another embodiment (Embodiment 2) of the present disclosure, it is noted that the light efficiency based on the 0° viewing angle is improved by 29%.

[0142] Based on this disclosure, the following beneficial effects can be obtained.

[0143] In the organic light-emitting display device according to this disclosure, the light extraction efficiency of light emitted from the organic light-emitting element can be improved.

[0144] The organic light-emitting display device according to this disclosure can solve the problem of reflective visibility caused by the reflection of external light, can prevent the appearance of black gaps, and can achieve pure black in a non-driven or off state.

[0145] The organic light-emitting display device according to this disclosure can solve the problem of uneven rainbow.

[0146] It will be apparent to those skilled in the art that the present disclosure is not limited to the described embodiments and drawings, and that various substitutions, modifications, and variations may be made in the present disclosure without departing from its spirit or scope. Therefore, the scope of the present disclosure is defined by the appended claims, and all variations or modifications intended to be derived from the meaning, scope, and equivalent concepts of the claims fall within the scope of the present disclosure.

Claims

1. An organic light-emitting display device, comprising: Including sub-pixels of the luminescent region; A planarization layer overlapping the light-emitting region, the planarization layer comprising multiple light extraction patterns having multiple protrusions and multiple recesses; A light control pattern is alternately disposed in the recesses of the plurality of light extraction patterns, such that two recesses are spaced apart by a recess without the light control pattern in at least one direction along the light-emitting region; as well as A light-emitting element is disposed above the plurality of light-extracting patterns and the light-controlling pattern. The recess on which the light control pattern is set has a flat upper surface.

2. The organic light-emitting display device according to claim 1, wherein, The light-controlled pattern fills the recess to alternately flatten the upper surface of the recess.

3. The organic light-emitting display device according to claim 1, wherein, The refractive index of the light control pattern is greater than that of the planarization layer.

4. The organic light-emitting display device according to claim 1, wherein, The central portions of four adjacent recesses are connected in sequence to form a square shape, a rhombus shape, or a diamond shape.

5. The organic light-emitting display device according to claim 4, wherein, When the central parts of four adjacent concave parts are connected in sequence, two corners connected by lines have different structures, and two corners not connected by lines have the same symmetrical structure.

6. The organic light-emitting display device according to claim 4, wherein, With the central portions of four adjacent recesses connected in sequence, the light control pattern is set in one recess of the two corner recesses connected by lines, but not in the other recess.

7. The organic light-emitting display device according to claim 4, wherein, With the central portions of four adjacent recesses connected in sequence, the light control pattern is either set in two recesses at two corners facing each other based on the diagonal direction, or not set in two recesses at two corners facing each other based on the opposite diagonal direction.

8. The organic light-emitting display device according to claim 1, wherein, The light control pattern fills a recess in the light extraction pattern to flatten the recess, and is not located in a recess adjacent to the recess.

9. The organic light-emitting display device according to claim 1, wherein, The light control pattern does not overlap with another light control pattern disposed in the next row or adjacent row in the first direction.

10. The organic light-emitting display device according to claim 1, wherein, The light control pattern does not overlap with another light control pattern disposed in the next column or adjacent column in the second direction.

11. The organic light-emitting display device according to claim 1, wherein, The light-emitting element follows the surface shape of the light extraction pattern and the light control pattern, is disposed above the inclined portion of the light extraction pattern, has a concave shape in the recess of the light extraction pattern where the light control pattern is not disposed, and has a flat upper surface in the recess of the light extraction pattern where the light control pattern is disposed.

12. The organic light-emitting display device according to claim 11, wherein, The light-emitting element alternately has the concave shape and the flat shape.

13. The organic light-emitting display device according to claim 11, wherein, The light-emitting element includes a first electrode, a light-emitting element layer, and a second electrode. The second electrode follows the surface shape of the light extraction pattern and the light control pattern, is disposed above the inclined portion of the light extraction pattern, has a concave shape in the recess of the light extraction pattern where the light control pattern is not disposed, and has a flat upper surface in the recess of the light extraction pattern where the light control pattern is disposed.

14. The organic light-emitting display device according to claim 13, wherein, External light entering the organic light-emitting display device from outside is reflected three times by the second electrode.

15. The organic light-emitting display device according to claim 14, wherein, The external light is reflected by a second electrode positioned above an inclined portion of the light extraction pattern in the organic light-emitting display device, reflected again by a second electrode positioned on the flat upper surface of a recess of the light extraction pattern on which the light control pattern is provided, and reflected by a second electrode positioned above an inclined portion of a recess of an adjacent light extraction pattern on which the light control pattern is not provided.

16. The organic light-emitting display device according to claim 13, further comprising: A substrate, which is disposed in the direction of light emission from the light-emitting element; A phase film, which is attached to the substrate in the direction of light emission; as well as A polarizing film, which is attached to the phase film in the direction of light emission.

17. The organic light-emitting display device according to claim 16, wherein, External light entering the organic light-emitting display device from outside is first circularly polarized to the left by the phase film. First, the left-hand circularly polarized light is reflected by the second electrode positioned above the inclined portion of the light extraction pattern (where no light control pattern is set), and becomes the first right-hand circularly polarized light. The first right-hand circularly polarized light is reflected by a flat second electrode positioned above the upper surface of the light control pattern, which is located above the recess of the light extraction pattern, and becomes the second left-hand circularly polarized light. The second left-hand circularly polarized light is reflected by a second electrode positioned above the inclined portion of an adjacent light extraction pattern that does not have the light control pattern, and becomes the second right-hand circularly polarized light. The second right-hand circularly polarized light is prevented from being emitted by the polarizing film.

18. The organic light-emitting display device according to claim 1, wherein, The light-emitting element includes a first electrode, a light-emitting element layer, and a second electrode. The light-emitting element layer is disposed with a first thickness above the inclined portion of the light extraction pattern where the light control pattern is not disposed, and with a second thickness greater than the first thickness above the bottom surface of the recess where the light control pattern is not disposed.

19. The organic light-emitting display device according to claim 18, wherein, The light-emitting element layer is disposed with a third thickness above the recess of the light extraction pattern on which the light control pattern is disposed, and The second thickness is the same as the third thickness.

20. A display device, comprising: A substrate containing a light-emitting region; The sub-pixel on the substrate includes a light-emitting element configured to emit light toward the substrate in the light-emitting region; A planarization layer in the light-emitting region, the planarization layer comprising a plurality of recesses extending toward the substrate and overlapping the light-emitting element; as well as A light control pattern is disposed in a first plurality of recesses from the plurality of recesses, but not in a second plurality of recesses from the plurality of recesses, wherein the first plurality of recesses and the second plurality of recesses are alternately disposed. The first plurality of recesses on which the light control pattern is disposed have a flat upper surface.

21. The display device according to claim 20, wherein, The refractive index of the light control pattern is greater than that of the planarization layer.

22. The display device according to claim 21, wherein, A recess from a first plurality of recesses filled with the light control pattern is disposed between a pair of recesses from a second plurality of recesses not filled with the light control pattern.

23. The display device according to claim 22, wherein, The recesses from the first plurality of recesses and a pair of recesses from the second plurality of recesses are arranged in the same row or the same column in a plan view of the display device.

24. The display device according to claim 20, wherein, The planarization layer also includes a plurality of protrusions extending away from the substrate, each protrusion being disposed between a pair of recesses from the plurality of recesses.

Images