Organic Light Emitting Diode Display

Abstract

The present disclosure relates to an organic light emitting diode display, which includes: a substrate, including a display area and a non-display area; a pixel circuit, arranged in the display area; an organic light emitting diode and a barrier, arranged on the pixel circuit; an encapsulation layer, covering the pixel circuit, the organic light emitting diode and the barrier; and a color filter, arranged on the encapsulation layer, wherein the encapsulation layer includes: an edge area, in the display area, the edge area is adjacent to the non-display area; and a central area, the central area is not directly adjacent to the non-display area and the edge area is arranged between the central area and the non-display area, the color filter includes a first color filter, a second color filter, a third color filter and an overlapping portion in which the first color filter, the second color filter and the third color filter overlap, and the overlapping portion is arranged in an area where the barrier is arranged, and the thickness of the color filter is greater in the edge area than in the central area.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2018-0110444 filed on September 14, 2018, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The inventive concept relates to an organic light emitting diode (OLED) display. Background Art

[0004] The organic light emitting diode display includes two electrodes and an organic emission layer positioned between the two electrodes, and electrons injected from a cathode and holes injected from an anode are combined with each other in the organic emission layer to generate excitons, and light is emitted by emission energy of the excitons.

[0005] Recently, a flexible organic light emitting diode (OLED) display using a light, impact-resistant, flexible and easily deformable substrate has been developed. Flexible OLED displays are attracting attention as next-generation display devices that can be used for televisions, computer monitors, portable devices, wearable devices, etc.

[0006] In addition to the function of displaying images, such an OLED display may also include a touch sensing function that can interact with the user. When the user touches a finger or a stylus pen on the screen, the touch sensing function senses changes in pressure, charge, or light applied to the screen to determine touch information such as whether an object is touched on the screen and the touch position. The OLED display may receive an image signal based on the touch information.

[0007] The above information disclosed in this Background section is only for enhancement of understanding of the background of the inventive concept and therefore the above information may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the invention

[0008] Example embodiments have been made to provide an OLED display whose optical characteristics are uniform throughout the entire viewing area and which is capable of achieving high resolution.

[0009] According to an exemplary embodiment, an OLED display includes: a substrate, the substrate including a display area and a non-display area; a pixel circuit, the pixel circuit is arranged in the display area; an organic light emitting diode and a barrier, the organic light emitting diode and the barrier are arranged on the pixel circuit; an encapsulation layer, the encapsulation layer covers the pixel circuit, the organic light emitting diode and the barrier; and a color filter, the color filter is arranged on the encapsulation layer, wherein the encapsulation layer includes: an edge area, in the display area, the edge area is adjacent to the non-display area; and a central area, the central area is not directly adjacent to the non-display area and the edge area is arranged between the central area and the non-display area, the color filter includes a first color filter, a second color filter, a third color filter and an overlapping portion where the first color filter, the second color filter and the third color filter overlap, and the overlapping portion is arranged in a region where the barrier is provided, and the thickness of the color filter is greater in the edge area than in the central area.

[0010] The organic light emitting diode may include an organic emission layer, and a difference between a distance from a top surface of the organic emission layer to a topmost portion of the overlapping portion of the color filter in the central region and a distance from the top surface of the organic emission layer to a topmost portion of the overlapping portion of the color filter in the edge region may be less than 7% of the distance from the top surface of the organic emission layer to the topmost portion of the overlapping portion of the color filter in the central region.

[0011] A thickness of the encapsulation layer in the central region may be greater than a thickness of the encapsulation layer in the edge region.

[0012] The edge region surrounds the central region, and a thickness of the encapsulation layer in the edge region may be less than 90% of a maximum thickness of the encapsulation layer in the central region.

[0013] A difference between a distance from the substrate to the top surface of the overlapping portion in the central region and a distance from the substrate to the top surface of the overlapping portion in the edge region is less than 5% of the distance from the substrate to the top surface of the overlapping portion in the central region.

[0014] The first color filter, the second color filter, and the third color filter may be a red color filter, a green color filter, and a blue color filter, respectively.

[0015] The first color filter, the second color filter, and the third color filter may be a magenta color filter, a yellow color filter, and a cyan color filter, respectively.

[0016] An OLED display according to an exemplary embodiment includes: a substrate including a display area and a non-display area; a pixel circuit disposed in the display area; an organic light emitting diode and a barrier rib disposed on the pixel circuit; an encapsulation layer covering the pixel circuit, the organic light emitting diode and the barrier rib; a touch sensing layer disposed on the encapsulation layer; and a color filter disposed on the touch sensing layer, wherein the encapsulation layer includes: an edge area adjacent to the non-display area in the display area; and a central area not directly adjacent to the non-display area and disposed between the central area and the non-display area, the touch sensing layer includes a planarization layer and a touch electrode, the thickness of the planarization layer is greater in the edge area than in the central area, and the color filter includes a first color filter, a second color filter, a third color filter, and an overlapping portion where the first color filter, the second color filter, and the third color filter overlap.

[0017] The overlapping portion may be provided in a region corresponding to the barrier rib.

[0018] The first color filter, the second color filter, and the third color filter may be a red color filter, a green color filter, and a blue color filter, respectively.

[0019] The organic light emitting diode may include an organic emission layer, and a difference between a distance from a top surface of the organic emission layer to a topmost portion of the overlapping portion of the color filter in the central region and a distance from the top surface of the organic emission layer to a topmost portion of the overlapping portion of the color filter in the edge region may be less than 7% of the distance from the top surface of the organic emission layer to the topmost portion of the overlapping portion of the color filter in the central region.

[0020] The touch sensing layer may further include an inorganic insulating layer, the touch electrode may include a first touch electrode and a second touch electrode, and each of the first touch electrode and the second touch electrode may include a plurality of unit electrode lines.

[0021] The first touch electrode may include a plurality of first touch units arranged along a first direction and a plurality of first connection portions connecting the plurality of first touch units, and the second touch electrode may include a plurality of second touch units arranged along a second direction crossing the first direction and a plurality of second connection portions connecting the plurality of second touch units.

[0022] The first connection portion may be disposed on the encapsulation layer, the planarization layer and the inorganic insulating layer may be disposed on the first connection portion in sequence, the first touch unit, the second touch unit and the second connection portion may be disposed on the inorganic insulating layer, and the first touch unit is also disposed in an opening formed in the planarization layer and the inorganic insulating layer, so that the first touch unit is connected to the first connection portion.

[0023] The first touch electrode may receive a first touch signal for sensing a coordinate value in the second direction, and the second touch electrode may receive a second touch signal for sensing a coordinate value in the first direction.

[0024] The planarization layer may include an organic material, and the inorganic insulating layer may include silicon nitride (SiN x ) or silicon oxide (SiO x ).

[0025] The encapsulation layer may have a thickness greater in the central region than in the edge region.

[0026] The touch sensing layer may further include: an inorganic insulating layer disposed on the planarization layer; and wirings connected to the touch electrodes, wherein the touch electrodes may be disposed on the inorganic insulating layer, and the touch electrodes may include a plurality of unit electrode lines.

[0027] The planarization layer may include an organic material, and the inorganic insulating layer may include silicon nitride (SiN x ) or silicon oxide (SiO x ).

[0028] An OLED display according to an exemplary embodiment includes: a substrate, the substrate including a display area and a non-display area; a pixel circuit, the pixel circuit is arranged in the display area; an organic light emitting diode and a barrier, the organic light emitting diode and the barrier are arranged on the pixel circuit; an encapsulation layer, the encapsulation layer covers the pixel circuit, the organic light emitting diode and the barrier; and a color filter, the color filter is arranged on the encapsulation layer, wherein the encapsulation layer includes: an edge area, in the display area, the edge area is adjacent to the non-display area; and a central area, the central area is not directly adjacent to the non-display area The central area and the non-display area are directly adjacent and the edge area is arranged between the central area and the non-display area, the color filter includes a first color filter, a second color filter, a third color filter and an overlapping portion where the first color filter, the second color filter and the third color filter overlap, and the overlapping portion is arranged in an area where the barrier is provided, and the difference between the distance from the substrate in the central area to the top surface of the overlapping portion and the distance from the substrate in the edge area to the top surface of the overlapping portion is less than 5% of the distance from the substrate in the central area to the top surface of the overlapping portion.

[0029] A height of a top surface of the encapsulation layer in the central region may be uniform, and may gradually decrease in the edge region.

[0030] According to exemplary embodiments, an OLED display capable of achieving high resolution and having uniform optical characteristics throughout an entire area may be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic layout diagram of an OLED display according to an exemplary embodiment of the inventive concept.

[0032] Figure 2 It is along Figure 1 A schematic cross-sectional view of an OLED display taken along line II-II'.

[0033] Figure 3 It is in the central area Figure 1 and Figure 2 A cross-sectional view of an OLED display.

[0034] Figure 4 yes Figure 1 and Figure 2 Cross-sectional view of the central area and edge area of ​​an OLED display.

[0035] Figure 5 is a graph showing transmittance according to the wavelength of light for each color filter.

[0036] Figure 6is a schematic layout diagram of an OLED display according to another exemplary embodiment of the inventive concept.

[0037] Figure 7 It is along Figure 6 Schematic cross-sectional view of the OLED display taken along line VII-VII'.

[0038] Figure 8 yes Figure 7 A top plan view of a touch sensing layer.

[0039] Fig. 9 yes Figure 8 An enlarged layout diagram of portion A.

[0040] Fig.10 yes Figures 6 to 9 Cross-sectional view of the central area and edge area of ​​an OLED display.

[0041] Fig.11 is a top plan view of a touch sensing layer included in an OLED display according to another exemplary embodiment.

[0042] Fig.12 Yes Fig.11 A cross-sectional view of the central and edge regions of an OLED display with a touch sensing layer. DETAILED DESCRIPTION

[0043] Hereinafter, the inventive concept will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. As will be appreciated by those skilled in the art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the inventive concept.

[0044] The drawings and description are to be regarded as illustrative in nature and not restrictive.Throughout the specification, like reference numerals refer to like elements.

[0045] In addition, for the sake of understanding and ease of description, the size and thickness of each configuration shown in the figures are arbitrarily shown, but the inventive concept is not limited thereto. In the figures, for the sake of clarity, the thickness of layers, films, panels, regions, etc. are exaggerated. In the figures, for better understanding and ease of description, the thickness of some layers and regions is exaggerated.

[0046] It will be understood that when an element such as a layer, film, region, or substrate is described as being "on" another element, the element may be directly on the other element, or intervening elements may also be present. In contrast, when an element is described as being "directly on" another element, there are no intervening elements. Furthermore, throughout the specification, the term "on" a target element means being positioned above or below the target element, and does not necessarily mean being positioned "at the upper side" based on the direction of gravity.

[0047] In addition, unless explicitly described to the contrary, the word “comprise” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0048] Further, throughout the specification, the phrase "on a plane" means viewing a target portion from the top, and the phrase "on a cross section" means viewing a cross section formed by vertically cutting the target portion from the side.

[0049] Reference Figures 1 to 4 , an organic light emitting diode (OLED) display according to an exemplary embodiment will be described.

[0050] Figure 1 is a schematic layout diagram of an OLED display according to an exemplary embodiment of the inventive concept. Figure 2 It is along Figure 1 A schematic cross-sectional view of an OLED display taken along line II-II'.

[0051] Reference Figure 1 , the OLED display includes a display panel 10. The display panel 10 includes a display area DA and a non-display area PA. The display area DA is an area in which a plurality of pixels PX are formed, and an image is displayed. In the display area DA, a plurality of signal lines including a plurality of gate lines 173, a plurality of data lines 171, and a plurality of driving voltage lines 172 are formed. The non-display area PA is an area in which elements or wirings are disposed, which generate or transmit various signals applied to the display area DA.

[0052] Reference Figure 2 , the display panel 10 includes a substrate 110 , a display layer 200 , an encapsulation layer 300 , a color filter 410 and a cover layer 420 .

[0053] The substrate 110 may include a flexible material such as plastic that can be bendable, foldable, and rollable, etc. For example, the substrate 110 may include polyimide (PI), polyethylene naphthalate (PEN), polycarbonate (PC), polyarylate (PAR), polyetherimide (PEI), or polyethersulfone (PES), etc. The substrate 110 is also divided into a display area DA and a non-display area PA.

[0054] The display layer 200 is disposed in the display area DA of the substrate 110. The display layer 200 includes a pixel circuit including at least one thin film transistor, an organic light emitting element that controls light emission through the pixel circuit, and a barrier separating the emission areas. According to an exemplary embodiment, the display layer 200 may further include a touch sensing layer (not shown) for sensing touch, and the touch sensing layer may be disposed above or below the organic light emitting element.

[0055] The encapsulation layer 300 is disposed on the display layer 200 to cover the display layer 200. The encapsulation layer 300 may seal the display layer 200 by covering not only the top surface of the display layer 200 but also the side surface of the display layer 200. Since the organic light-emitting element is susceptible to moisture and oxygen, the encapsulation layer 300 blocks the intrusion of external moisture and oxygen by sealing the display layer 200. The encapsulation layer 300 includes a plurality of layers, and may be formed of a composite layer including both an inorganic layer and an organic layer, or may be formed of three layers in which an inorganic layer, an organic layer, and an inorganic layer are sequentially stacked. Here, the inorganic layer may include at least one of a metal oxide, a metal nitride oxide, a silicon oxide, a silicon nitride, and a silicon oxynitride, and the organic layer may be formed of a polymer-based material, but this is not restrictive.

[0056] The encapsulation layer 300 is disposed in the entire display area DA, and extends from the display area DA so that the end of the encapsulation layer 300 can be disposed in the non-display area PA. On a plane, the encapsulation layer 300 includes: a central area CA, which is disposed at the center of the encapsulation layer 300 in the display area DA; and an edge area EA, which is disposed at the edge of the encapsulation layer 300 in the display area DA. The edge area EA of the encapsulation layer 300 is disposed in an area of ​​the display area DA that contacts the non-display area PA and / or is directly adjacent to the non-display area PA, and the central area CA is spaced apart from the non-display area PA while inserting the edge area EA between the central area CA and the non-display area PA. The edge area EA can be disposed in an area surrounding the central area CA, that is, the edge area EA can be disposed at the periphery of the central area CA.

[0057] In the central area CA, the encapsulation layer 300 has a substantially flat upper surface. That is, the encapsulation layer 300 may have a uniform thickness throughout the entire area of ​​the central area CA, and the distance from the substrate 110 to the top surface of the encapsulation layer 300 may be uniform. Hereinafter, the thickness of the encapsulation layer 300 in the central area CA is referred to as a first thickness. For example, the first thickness may be about 8 μm to about 9 μm. However, this is an example, and the thickness of the encapsulation layer 300 is not limited thereto.

[0058] In the edge area EA, the thickness of the encapsulation layer 300 gradually decreases. The edge area EA may be an area where the thickness of the encapsulation layer 300 is 90% or less of the maximum thickness in the central area CA. For example, the length of the edge area EA from the end of the display layer 200 may be about 3.5 mm to 4.5 mm. That is, the edge area EA may be arranged along the edge of the display layer 200, and the width of the edge area EA may be about 3.5 mm to 4.5 mm. Hereinafter, the thickness of the encapsulation layer 300 at the edge area EA is referred to as the second thickness. The second thickness of the encapsulation layer 300 gradually decreases toward the end of the encapsulation layer, and therefore, the top surface of the encapsulation layer 300 gradually decreases in the edge area EA. The top surface of the encapsulation layer 300 is curved and therefore tilted in the edge area EA. In the edge area EA, the top surface of the encapsulation layer 300 may be curved, but is not limited thereto. The second thickness of the encapsulation layer 300 is less than the first thickness. For example, the maximum thickness of the second thickness of the encapsulation layer 300 in the edge area EA may be less than 8 μm.

[0059] At the edge of the encapsulation layer 300, the top surface of the encapsulation layer 300 contacts the plane of the substrate 110, and the top surface of the encapsulation layer 300 may form an acute angle with the bottom surface of the encapsulation layer 300 at a portion where the top surface of the encapsulation layer 300 contacts the plane of the substrate 110. The top surface of the encapsulation layer 300 may have a shape inclined from the edge area EA toward the end of the encapsulation layer 300, and may be curved.

[0060] The color filter 410 is disposed on the encapsulation layer 300. The color filter 410 suppresses reflection of external light and minimizes loss of light discharged to the outside. In addition, since the color filter 410 transmits light having only a wavelength band of the emitted color, a desired color can be realized more realistically.

[0061] In the OLED display according to an exemplary embodiment, the thickness of the color filter 410 gradually increases toward the end of the color filter 410. Therefore, the thickness of the color filter 410 in the edge area EA is greater than the thickness of the color filter 410 in the central area CA. In addition, in the edge area EA, the thickness of the color filter 410 may gradually increase toward the end of the display area DA. Since the top surface of the encapsulation layer 300 gradually decreases toward the edge in the edge area EA, the bottom surface of the color filter 410 also gradually decreases toward the end of the color filter 410. As the bottom surface of the color filter 410 decreases, the thickness of the color filter 410 increases, thereby compensating for the step difference.

[0062] Therefore, the distance from the substrate 110 or the display layer 200 to the top surface of the color filter 410 is almost uniform not only in the central area CA but also in the edge area EA. For example, the difference between the distance from the substrate 110 or the display layer 200 to the top surface of the color filter 410 in the central area CA and the distance from the substrate 110 or the display layer 200 to the top surface of the color filter 410 in the edge area EA may be less than 5% of the distance from the substrate 110 or the display layer 200 to the top surface of the color filter 410 in the central area CA.

[0063] The overcoat layer 420 is disposed on the color filter 410. The overcoat layer 420 is formed on the color filter 410 to protect the color filter 410 and planarize the surface of the layer in which the color filter 410 is formed.

[0064] The cover layer 420 may include an organic insulating layer. The organic insulating layer may include a general polymer (e.g., polymethyl methacrylate (PMMA) and polystyrene (PS)), a polymer derivative having a phenol group, an acrylic polymer, an imine polymer, an aryl ether polymer, an amide polymer, a fluoropolymer, a p-xylene polymer, a vinyl alcohol-based polymer, or a mixture thereof. The cover layer 420 may be provided as a mixed stack of an inorganic insulating layer and an organic insulating layer. The inorganic insulating layer may include SiO 2 、SiN x 、SiON、Al 2 O 3 、TiO 2 、 2 O 5 , HfO 2 、ZrO 2 , BST and PZT, etc.

[0065] Figure 3 is a cross-sectional view of a central area CA of an OLED display according to an exemplary embodiment.

[0066] Reference Figure 3 , an OLED display according to an exemplary embodiment includes a substrate 110 , a pixel circuit 250 , an organic light emitting diode (OLED), a barrier rib 361 , an encapsulation layer 300 , a color filter 410 , and a cover layer 420 .

[0067] The substrate 110 may include a flexible material such as plastic that is bendable, foldable, or rollable. Figure 2 The above description is the same, so the detailed description will be omitted.

[0068] A buffer layer 121 is disposed on the substrate 110. The buffer layer 121 may include silicon nitride (SiN x ) or silicon oxide (SiOx The buffer layer 121 is disposed between the substrate 110 and the semiconductor layer 154 and improves the characteristics of polysilicon by blocking impurities from the substrate 110 during a crystallization process for forming polysilicon, and the stress of the semiconductor layer 154 formed on the buffer layer 121 can be relieved by planarizing the substrate 110.

[0069] A semiconductor layer 154 is provided on the buffer layer 121. The semiconductor layer 154 may be formed of polysilicon or an oxide semiconductor.

[0070] The semiconductor layer 154 may be formed of polycrystalline silicon and include a channel region 152, a source region 151, and a drain region 153. The source region 151 and the drain region 153 are respectively disposed at opposite sides of the channel region 152. The channel region 152 is an intrinsic semiconductor in which impurities are not doped, and the source region 151 and the drain region 153 are impurity semiconductors in which conductive impurities are doped. The semiconductor layer 154 may be formed of an oxide semiconductor, in which case an additional passivation layer may be added to protect the oxide semiconductor that is susceptible to the external environment.

[0071] The gate insulating layer 122 is disposed on the semiconductor layer 154 to cover the semiconductor layer 154. The gate insulating layer 122 may include silicon nitride (SiN x ) and silicon oxide (SiO x ) is a single layer or multiple layers of at least one of ).

[0072] A gate electrode 155 is provided on the gate insulating layer 122. The gate electrode 155 may be a multilayer in which a metal layer including one of copper (Cu), a copper alloy, aluminum (Al), an aluminum alloy, molybdenum (Mo), and a molybdenum alloy is stacked.

[0073] An interlayer insulating layer 123 is provided on the gate electrode 155 and the gate insulating layer 122. The interlayer insulating layer 123 may include silicon nitride (SiN x ) or silicon oxide (SiO x Openings that expose the source region 151 and the drain region 153 , respectively, are formed in the interlayer insulating layer 123 .

[0074] A source electrode 161 and a drain electrode 162 are formed on the interlayer insulating layer 123. The source electrode 161 and the drain electrode 162 are connected to the source region 151 and the drain region 153 of the semiconductor layer 154 through openings formed in the interlayer insulating layer 123 and the gate insulating layer 122, respectively.

[0075] A passivation layer 180 is provided on the interlayer insulating layer 123, the source electrode 161, and the drain electrode 162. The passivation layer 180 flattens the interlayer insulating layer 123, the source electrode 161, and the drain electrode 162 by covering the interlayer insulating layer 123, the source electrode 161, and the drain electrode 162, so that the pixel electrode 191 can be formed on the passivation layer 180 without a step difference. The passivation layer 180 may be formed of an organic material such as a polyacrylate resin or a polyimide resin, or may be formed of a stacked layer of an organic material and an inorganic material.

[0076] The pixel electrode 191 is disposed on the passivation layer 180. The pixel electrode 191 is connected to the drain electrode 162 through an opening formed in the passivation layer 180.

[0077] A driving transistor formed of the gate electrode 155, the semiconductor layer 154, the source electrode 161, and the drain electrode 162 is connected to the pixel electrode 191, thus supplying a driving current to the organic light emitting diode OLED. Figure 3 The driving transistor shown in the figure, the OLED display according to the present exemplary embodiment may also include: a switching transistor (not shown), which is connected to the data line and transmits a data voltage in response to a scan signal; and a compensation transistor (not shown), which is connected to the driving transistor and compensates for a threshold voltage of the driving transistor in response to the scan signal.

[0078] The barrier 361 is disposed on the passivation layer 180 and the pixel electrode 191 and covers the passivation layer 180 and the pixel electrode 191, and the barrier 361 includes a pixel opening 365 exposing the pixel electrode 191. The barrier 361 may include an organic material such as a polyacrylate resin or a polyimide resin or an inorganic material based on silicon dioxide. On a plane, the pixel opening 365 may be formed in a rhombus shape, but is not limited thereto. The pixel opening 365 may have any shape such as a quadrilateral or a polygon.

[0079] An organic emission layer 370 is provided on a portion of the pixel electrode 191 exposed by the pixel opening 365. The organic emission layer 370 may be formed of a low molecular weight organic material or a high molecular weight organic material such as poly 3,4-ethylenedioxythiophene (PEDOT). In addition, the organic emission layer 370 may be a multilayer including one or more of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL).

[0080] The organic emission layer 370 includes a red organic emission layer 370R that emits red light, a green organic emission layer 370G that emits green light, and a blue organic emission layer 370B that emits blue light. The red organic emission layer 370R, the green organic emission layer 370G, and the blue organic emission layer 370B are respectively formed in red pixels, green pixels, and blue pixels for realizing color images. The organic emission layer 370 includes a red organic emission layer 370R, a green organic emission layer 370G, and a blue organic emission layer 370B, but the organic emission layer 370 can also emit magenta light, yellow light, and cyan light.

[0081] A common electrode 270 is disposed on the organic emission layer 370. The common electrode 270 may be disposed above a plurality of pixels. The pixel electrode 191, the organic emission layer 370, and the common electrode 270 may form an organic light emitting diode OLED.

[0082] Here, the pixel electrode 191 may be an anode as a hole injection electrode, and the common electrode 270 may be a cathode as an electron injection electrode. However, exemplary embodiments of the inventive concept are not limited thereto, and according to a driving method of the OLED display, the pixel electrode 191 may be a cathode and the common electrode 270 may be an anode. Holes and electrons are injected from the pixel electrode 191 and the common electrode 270 into the organic emission layer 370, respectively, and excitons generated by combining the injected holes and electrons transition from an excited state to a ground state to emit light.

[0083] Therefore, the display panel 10 includes an emission area LA in which the organic emission layer 370 is disposed so that the organic emission layer 370 emits light and a non-emission area NLA in which the barrier rib 361 is disposed so that no light is emitted.

[0084] An encapsulation layer 300 is disposed on the common electrode 270 . Figure 3 The encapsulation layer 300 shown in FIG. 1 is disposed in the central area CA and thus has a uniform thickness. That is, the distance from the substrate 110 to the top surface of the encapsulation layer 300 is consistent. Figure 2 The encapsulation layer 300 is the same as that of the encapsulation layer 300 , and thus no further detailed description will be provided.

[0085] A color filter 410 is provided on the encapsulation layer 300. The color filter 410 includes a red color filter 410R, a green color filter 410G, and a blue color filter 410B. The red color filter 410R transmits light of a wavelength in the red region, the green color filter 410G transmits light of a wavelength in the green region, and the blue color filter 410B transmits light of a wavelength in the blue region. The color filter 410 is formed to correspond to the emission region LA and extends to the adjacent non-emission region NLA of the emission region LA.

[0086] When forming the color filter 410, the green color filter 410G, the red color filter 410R, and the blue color filter 410B are sequentially formed in the order of the green color filter 410G, the red color filter 410R, and the blue color filter 410B. The green color filter 410G is disposed in the emission area LA corresponding to the green organic emission layer 370G, and extends to the non-emission area NLA adjacent to the green organic emission layer 370G. The green color filter 410G is disposed in a portion of the non-emission area NLA, and a portion of the non-emission area NLA is disposed between the red organic emission layer 370R and the blue organic emission layer 370B. In this case, the green color filter 410G is not disposed in the portion of the emission area LA corresponding to the red organic emission layer 370R, or is not disposed in the portion of the emission area LA corresponding to the blue organic emission layer 370B.

[0087] The red color filter 410R is disposed in a portion of the emission area LA corresponding to the red organic emission layer 370R, and extends to the non-emission area NLA adjacent to the red organic emission layer 370R, thereby overlapping the green color filter 410G. The red color filter 410R is also disposed in a portion of the non-emission area NLA, which is disposed between the green organic emission layer 370G and the blue organic emission layer 370B. In this case, the red color filter 410R is not disposed in a portion of the emission area LA corresponding to the green organic emission layer 370G or the blue organic emission layer 370B.

[0088] The blue color filter 410B is disposed in a portion of the emission area LA corresponding to the blue organic emission layer 370B and extends to the non-emission area NLA adjacent to the blue organic emission layer 370B, thereby overlapping the red color filter 410R. The blue color filter 410B is also disposed in a portion of the non-emission area NLA between the red organic emission layer 370R and the green organic emission layer 370G. In this case, the blue color filter 410B is not disposed in a portion of the emission area LA corresponding to the red organic emission layer 370R and a portion of the emission area LA corresponding to the green organic emission layer 370G.

[0089] The red color filter 410R, the green color filter 410G, and the blue color filter 410B overlap with each other in the non-emission area NLA corresponding to the portion in which the barrier 361 is provided. Hereinafter, the portion in which the red color filter 410R, the green color filter 410G, and the blue color filter 410B overlap with each other is referred to as the overlapping portion of the color filter 410. The red color filter 410R, the green color filter 410G, and the blue color filter 410B transmit only red light, green light, and blue light, respectively, and therefore visible light including red light, green light, and blue light cannot be transmitted in the portion in which the red color filter 410R, the green color filter 410G, and the blue color filter 410B overlap with each other. When forming the color filter 410 , the green filter 410G, the red filter 410R, and the blue filter 410B are sequentially formed in the order of the green filter 410G, the red filter 410R, and the blue filter 410B, but the stacking order of the color filter 410 is not limited thereto.

[0090] The color filter 410 includes a red color filter 410R, a green color filter 410G, and a blue color filter 410B, but is not limited thereto. The color filter 410 may include any color that forms the three primary colors. For example, the color filter 410 may include a magenta color filter that transmits magenta light, a yellow color filter that transmits yellow light, and a cyan color filter that transmits cyan light.

[0091] The overcoat layer 420 is disposed on the color filter 410 to protect the color filter 410 and planarize the layer in which the color filter 410 is formed.

[0092] Figure 4 is a cross-sectional view of a central area CA and an edge area EA of an OLED display according to an exemplary embodiment. Figures 1 to 3 The content of the description.

[0093] Reference Figure 4 , the thickness h2-1 of the color filter 410 in the edge area EA is greater than the thickness h1-1 of the color filter 410 in the central area CA. The top surface of the encapsulation layer 300 is flat in the central area CA, but gradually decreases in the edge area EA. Therefore, when the thickness h2-1 of the color filter 410 in the edge area EA is formed to be thicker than the thickness h1-1 of the color filter 410 in the central area CA, the distance h1-2 from the top surface of the organic emission layer 370 to the topmost of the overlapping portion of the color filter 410 in the central area CA may be almost equal to the distance h2-2 from the top surface of the organic emission layer 370 to the topmost of the overlapping portion of the color filter 410 in the edge area EA. The distances h1-2 and h2-2 from the top surface of the organic emission layer 370 to the overlapping portion of the color filter 410 are vertical distances from a plane including the top surface of the organic emission layer 370 to the topmost of the overlapping portion of the color filter 410.

[0094] For example, the difference between the distance h1-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 in the central area CA and the distance h2-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 in the edge area EA may be less than 7% of the distance h1-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 in the central area CA. Alternatively, the difference between the distance h1-3 from the top surface of the substrate 110 to the topmost portion of the overlapping portion of the color filter 410 in the central area CA and the distance h2-3 from the top surface of the substrate 110 to the topmost portion of the overlapping portion of the color filter 410 in the edge area EA may be less than 5% of the distance h1-3.

[0095] exist Figure 4 , the region in which the overlapping portion of the single color filter 410 is provided in the central area CA and the edge area EA is described, but this is an example and the above contents may be similarly applied to the entire region of the central area CA and the edge area EA.

[0096] When the distance from the organic emission layer 370 to the overlapping portion of the color filter 410 is different, the brightness and viewing angle characteristics of the light emitted from the organic emission layer 370 and then transmitted through the color filter 410 may be changed. Therefore, the height of the overlapping portion of the color filter 410 from the organic emission layer 370 is formed uniformly to ensure uniform light characteristics.

[0097] The overlapping area of ​​the color filter 410 is disposed in the non-emission area NLA in which the barrier rib 361 is disposed. The overlapping area of ​​the color filter 410 is smaller than the non-emission area NLA in which the barrier rib 361 is disposed, and the width of the overlapping area of ​​the color filter 410 is smaller than the width of the non-emission area NLA. This is for the purpose of ensuring a wider viewing angle and improving brightness.

[0098] Figure 5 is a graph showing the transmittance according to the wavelength of light used for each color filter. In the case of the blue color filter BLUE, light with a wavelength of about 450nm to 480nm corresponding to blue light is transmitted. In the case of the green color filter GREEN, light with a wavelength of about 490nm to 570nm corresponding to green light is transmitted. In the case of the red color filter RED, light with a wavelength of more than about 640nm corresponding to red light is transmitted. When the red color filter, the green color filter, and the blue color filter overlap each other (R / G / B), the transmittance of light in the entire region of the wavelength of visible light does not exceed 5%. Therefore, when the red color filter, the green color filter, and the blue color filter overlap each other, light can be blocked.

[0099] When a polarizer is used in an OLED display to reduce the reflection of external light, the brightness ratio can be constant regardless of the thickness of the encapsulation layer, but the OLED display becomes thicker, resulting in a decrease in luminous efficiency. In addition, applying a polarizer to a flexible display device may cause damage. In order to solve this problem, an alternative polarizer structure using a light blocking member and a color filter has been developed to reduce the reflection of external light and improve the luminous efficiency while also being applicable to flexible displays.

[0100] However, in a polarizer alternative structure using a light blocking member and a color filter, as the resolution increases, the light blocking member is reduced in size, and therefore, it is difficult to form a pattern, and defective patterns in the light blocking member pattern increase. In addition, in a polarizer alternative structure using a light blocking member and a color filter, since the distance from the organic emission layer to the light blocking member varies according to the thickness of the encapsulation layer, the brightness ratio varies according to the thickness of the encapsulation layer. When the brightness dispersion increases due to the brightness difference of each area in the OLED display, the desired image may be distortedly presented on the entire surface of the OLED display, or consistent optical characteristics may not be ensured.

[0101] In the OLED display according to the exemplary embodiment, color filters overlap each other instead of using a light blocking member, thereby preventing the transmission of light in the non-emission area. As a result, the number of masks is reduced, thereby simplifying the process, and high resolution can be achieved.

[0102] In addition, the distance from the organic emission layer to the overlapping portion is formed uniformly without a step, so that the optical characteristics over the entire area of ​​the display area can be uniformly maintained. Therefore, in an OLED display, regardless of how the thickness of the encapsulation layer of each area varies, a uniform brightness ratio can be expected in the entire area.

[0103] In the following, reference will be made to Figures 6 to 10 An OLED display according to another exemplary embodiment of the inventive concept is described.

[0104] Figure 6 is a schematic layout diagram of an OLED display according to another exemplary embodiment of the present invention. Figures 1 to 5 Same content.

[0105] Reference Figure 6 , the OLED display includes a display panel 20. The display panel 20 includes a display area DA, a non-display area PA disposed at a periphery of the display area DA, and a touch area TA in which a touch may be sensed.

[0106] The touch area TA is an area in which a touch or motion can be sensed not only when an object directly contacts the display panel 20 but also when an object approaches the touch area TA or moves close to the touch area TA. The touch area TA may overlap the display area DA. Figure 6 In FIG. 1 , the touch area TA is shown as matching the display area DA, but is not limited thereto. The touch area TA may not match the display area DA.

[0107] The touch sensing function can be implemented by a capacitive touch sensor including touch electrodes. The touch electrodes in the capacitive touch sensor form a capacitor and sense the change in capacitance of the capacitor generated when a touch occurs. Touch information can be generated based on the change in capacitance.

[0108] Figure 7 It is along Figure 6 A schematic cross-sectional view of an OLED display taken along line VII-VII'. Figure 7 The display panel 20 includes a substrate 110, a display layer 200, an encapsulation layer 300, a touch sensing layer 350, a color filter 410, and a cover layer 420. In addition to the touch sensing layer 350, Figure 7 The OLED display of the exemplary embodiment is similar to Figure 2 The OLED display of the exemplary embodiment is described above, and thus description of the same contents will be omitted.

[0109] The encapsulation layer 300 includes: a central area CA, which is disposed at the center of the encapsulation layer 300 on a plane in the display area DA; and an edge area EA, which is disposed at the edge of the encapsulation layer 300 in the display area DA. In the display area DA, the edge area EA of the encapsulation layer 300 is disposed at an area contacting the non-display area PA, and the central area CA is disposed at intervals from the non-display area PA, while the edge area EA is disposed between the central area CA and the non-display area PA. The edge area EA may be disposed at a peripheral portion surrounding the central area CA.

[0110] In the central area CA, the encapsulation layer 300 may have a substantially flat top surface. The thickness of the encapsulation layer 300 in the edge area EA is less than the thickness of the encapsulation layer 300 in the central area CA. The thickness of the encapsulation layer 300 gradually decreases in the edge area EA, and thus, the top surface of the encapsulation layer 300 gradually decreases.

[0111] The touch sensing layer 350 is disposed on the encapsulation layer 300. The thickness of the touch sensing layer 350 gradually increases toward the end of the touch sensing layer 350. Since the top surface of the encapsulation layer 300 gradually decreases toward the end, the bottom surface of the touch sensing layer 350 also gradually decreases toward the end of the touch sensing layer 350. As the bottom surface of the touch sensing layer 350 decreases, the thickness of the touch sensing layer 350 is formed large so that the distance from the substrate 110 to the top surface of the touch sensing layer 350 is almost the same not only in the central area CA but also in the edge area EA.

[0112] The touch sensing layer 350 uses the substrate 110 as a substrate, rather than having its own substrate. Such a touch sensing layer 350 can be very thin overall, so that the display panel 20 can be formed thin and is suitable for a flexible display.

[0113] The color filter 410 is disposed on the touch sensing layer 350. Figure 2 , the color filter 410 may have the same thickness in the central area CA and in the edge area EA. Since the height from the substrate 110 to the top surface of the touch sensing layer 350 is consistent, in the display area DA, even if the color filter 410 has a uniform thickness, the height from the substrate 110 or the display layer 200 to the color filter 410 may be generally consistent. For example, the difference between the distance from the substrate 110 or the display layer 200 to the top surface of the color filter 410 in the central area CA and the distance from the substrate 110 or the display layer 200 to the top surface of the color filter 410 in the edge area EA may be less than 5% of the distance from the substrate 110 or the display layer 200 to the top surface of the color filter 410 in the central area CA.

[0114] Figure 8 yes Figure 7 FIG. 3 is a schematic top plan view of a touch sensing layer 350 . The touch sensing layer 350 includes a first touch electrode 351 and a second touch electrode 352 .

[0115] The first touch electrode 351 includes: a plurality of first touch units 351a, each of which is formed in a rhombus shape; and a plurality of first connection parts 351b, which connect the plurality of first touch units 351a along the first direction x. The first touch electrode 351 may be a transmitter (Tx) touch electrode to which a first touch signal is transmitted to sense a coordinate value in the second direction y. The shape of the first touch unit 351a is not limited to a rhombus and may be modified variously.

[0116] The second touch electrode 352 may include: a plurality of second touch units 352a, each of which is formed in a rhombus shape; and a plurality of second connecting portions 352b, the plurality of second connecting portions 352b connecting the plurality of second touch units 352a along the second direction y. The second touch electrode 352 may be a receiver (Rx) touch electrode to which a second touch signal is transmitted to sense a coordinate value in the first direction x. The shape of the second touch unit 352a is shown as a rhombus, but is not limited thereto. On a plane, the first touch unit 351a and the second touch unit 352a are adjacent to each other, and the first connecting portion 351b and the second connecting portion 352b cross each other.

[0117] The first touch electrode 351 and the second touch electrode 352 are disposed to be separated from each other, and capacitance may be formed between the first touch electrode 351 and the second touch electrode 352. When there is a touch by a user, the capacitance between the first touch electrode 351 and the second touch electrode 352 changes, and a controller (not shown) senses this change and detects a touched position.

[0118] The first touch unit 351a, the second touch unit 352a and the second connection portion 352b may be arranged on the same layer. In addition, the first connection portion 351b may be arranged on a layer different from the layer in which the first touch unit 351a, the second touch unit 352a and the second connection portion 352b are arranged. Specifically, the first connection portion 351b may be arranged below the first touch unit 351a, the second touch unit 352a and the second connection portion 352b. However, this is not restrictive. The first connection portion 351b may be arranged above the first touch unit 351a, the second touch unit 352a and the second connection portion 352b. As described below, the first connection portion 351b may be connected to the first touch unit 351a through an opening.

[0119] The second touch unit 352a and the second connection portion 352b of the second touch electrode 352 may be formed integrally. Therefore, the first touch unit 351a, the second touch unit 352a, and the second connection portion 352b may be formed simultaneously by the same process. However, it is not required that the second connection portion 352b be formed simultaneously with the first touch unit 351a and the second touch unit 352a, and the second connection portion 352b and the first touch unit 351a and the second touch unit 352a may be formed separately by different processes using different materials.

[0120] In addition, in the present exemplary embodiment, the first connection portion 351b is formed on a layer different from the layer in which the first touch unit 351a, the second touch unit 352a and the second connection portion 352b are formed, and the first touch unit 351a, the second touch unit 352a and the first connection portion 351b can be formed on the same layer, and the second connection portion 352b can be formed on a layer different from the layer in which the first touch unit 351a, the second touch unit 352a and the first connection portion 351b are formed.

[0121] In addition, the first touch unit 351a and the first connection portion 351b of the first touch electrode 351 may be arranged on the same layer, the second touch unit 352a and the second connection portion 352b of the second touch electrode 352 may be arranged on the same layer, and the first touch electrode 351 and the second touch electrode 352 may be arranged on different layers.

[0122] The first touch electrode 351 and the second touch electrode 352 may include a low resistance metal such as silver (Ag), aluminum (Al), copper (Cu), chromium (Cr) or nickel (Ni), or may include a conductive nanomaterial such as silver nanowire or carbon nanotube. Such a first touch electrode 351 has a low resistance, and thus, RC delay can be reduced, and since the first touch electrode 351 has excellent flexibility, cracks are not easily generated even when deformation such as twisting occurs repeatedly.

[0123] The first touch sensing layer 350 includes a first wiring 21 and a second wiring 22. The first wiring 21 and the second wiring 22 are respectively connected to the first touch electrode 351 and the second touch electrode 352 and transmit touch signals. The first touch electrode 351 and the second touch electrode 352 may be disposed in the touch area TA, and the first wiring 21 and the second wiring 22 may be disposed in the non-display area PA outside the touch area TA.

[0124] Fig. 9 yes Figure 8 An enlarged layout diagram of part A. Fig. 9 , the first connection portion 351 b disposed on a layer different from a layer in which the first touch unit 351 a of the first touch electrode 351 and the second touch electrode 352 are disposed is separately illustrated.

[0125] Reference Fig. 9, the first touch electrode 351 and the second touch electrode 352 may be arranged in a grid pattern. In this case, the first touch electrode 351 and the second touch electrode 352 include a plurality of unit electrode lines 3511 and 3521, each of which has a small width and is arranged in parallel in a third direction and a fourth direction intersecting the third direction. The unit electrode line 3511 of the first touch electrode 351 includes a unit electrode line 3511a of the first touch unit 351a and a unit electrode line 3511b of the first connection portion 351b. The unit electrode line 3521 of the second touch electrode 352 includes a unit electrode line 3521a of the second touch unit 352a and a unit electrode line 3521b of the second connection portion 352b. Some of the unit electrode lines 3511 and 3521 arranged parallel to the third direction and the remaining unit electrode lines 3511 and 3521 arranged parallel to the fourth direction intersecting the third direction are perpendicular to each other, so that a rhombus-shaped opening is formed. That is, according to the arrangement of the unit electrode lines 3511 and 3521, the mesh pattern of the first touch electrode 351 and the second touch electrode 352 may have a constant lattice shape.

[0126] The first touch electrode 351 and the second touch electrode 352 are formed by a plurality of unit electrode lines 3511 and 3521 and thus do not block light emitted from the OLED display and can minimize parasitic capacitance by reducing an area where the first touch electrode 351 and the second touch electrode 352 overlap with a conductive wiring of the display panel.

[0127] The first touch electrode 351 and the second touch electrode 352 include openings in a rhombus shape, but are not limited thereto. The openings may have any shape such as a quadrilateral or a polygon. In addition, the third direction and the fourth direction in which the unit electrode lines 3511 and 3521 extend are not limited to the oblique directions, and the third direction and the fourth direction may be parallel to the first direction or the second direction.

[0128] The first connection portion 351b may be disposed under the first touch unit 351a, the second touch unit 352a, and the second connection portion 352b. Fig. 9 , the first connection portion 351b is disposed at a portion indicated by a dotted line, thereby partially overlapping the first touch unit 351a and the second connection portion 352b. The second connection portion 352b is insulated from the first connection portion 351b by an inorganic insulating layer to be described later. The first connection portion 351b is connected to the first touch unit 351a in an area overlapping with the first touch unit 351a.

[0129] Fig.10 is based on Figures 6 to 91 is a cross-sectional view of a central area CA and an edge area EA of an OLED display of an exemplary embodiment of the present invention. The description of the configurations identical to those described above will be omitted. Specifically, Fig.10 The cross sections of the unit electrode line 3511 a of the first touch unit 351 a and the unit electrode line 3511 b of the first connection portion 351 b are shown.

[0130] The OLED display according to an exemplary embodiment may further include an inorganic layer 301 on the encapsulation layer 300. The inorganic layer 301 may include at least one of metal oxide, metal nitride oxide, silicon oxide, silicon nitride, and silicon oxynitride. The inorganic layer 301 protects the encapsulation layer 300 by covering the encapsulation layer 300 and may prevent moisture from penetrating. In addition, the inorganic layer 301 may reduce the parasitic capacitance between the common electrode 270 and the touch sensing layer 350.

[0131] The touch sensing layer 350 is disposed on the inorganic layer 301. The touch sensing layer 350 includes a first touch electrode 351, a planarization layer 362, an inorganic insulating layer 363, and a second touch electrode 352. Fig.10 , a portion in which the unit electrode line 3511a of the first touch unit 351a and the unit electrode line 3511b of the first connection portion 351b in a region in which the first touch unit 351a and the first connection portion 351b of the first touch electrode 351 overlap each other is shown.

[0132] Reference Fig.10 , the unit electrode line 3511b of the first connection portion 351b is disposed on the inorganic layer 301, and the planarization layer 362 is disposed on the unit electrode line 3511b of the first connection portion 351b. The planarization layer 362 may include an organic material such as an acrylic-based resin. The thickness h4-1 of the planarization layer 362 in the edge area EA is greater than the thickness h3-1 of the planarization layer 362 in the central area CA. In the edge area EA, the thickness of the encapsulation layer 300 gradually decreases. However, the thickness h4-1 of the planarization layer 362 increases in the edge area EA so that the distance from the substrate 110 to the top surface of the planarization layer 362 can be constant in the central area CA and the edge area EA.

[0133] The inorganic insulating layer 363 is disposed on the planarization layer 362. The inorganic insulating layer 363 may include silicon nitride (SiN x ) or silicon oxide (SiO x ) of inorganic materials.

[0134] The unit electrode line 3511a of the first touch unit 351a is disposed on the inorganic insulating layer 363. In addition, although not shown, the second touch unit 352a and the second connection portion 352b connected to the second touch unit 352a are disposed on the inorganic insulating layer 363. In a plan view, the first touch unit 351a and the second touch unit 352a are disposed adjacent to each other. In a plane, the first connection portion 351b and the second connection portion 352b overlap each other, but the first connection portion 351b and the second connection portion 352b are insulated from each other by the inorganic insulating layer 363.

[0135] like Fig. 9 As shown in , the first touch unit 351a of the first touch electrode 351 overlaps with a portion of the first connection portion 351b. In the region where the first touch unit 351a and the first connection portion 351b overlap each other, the first touch unit 351a and the first connection portion 351b are connected to each other by contacting each other. Specifically, the planarization layer 362 and the inorganic insulating layer 363 may include an opening 25, which is a region through which the first connection portion 351b is exposed, and when the unit electrode line 3511a of the first touch unit 351a is formed, the material forming the unit electrode line 3511a of the first touch unit 351a fills the opening 25 so that the first touch unit 351a can be connected to the unit electrode line 3511b of the first connection portion 351b by directly contacting the unit electrode line 3511b of the first connection portion 351b. That is, the first touch unit 351a is disposed not only on the inorganic insulating layer 363 but also in the opening 25 through which the first connection portion 351b is exposed, and thus the first touch unit 351a may be connected with the first connection portion 351b.

[0136] On a plane, the unit electrode lines 3511 of the first touch electrode 351 and the unit electrode lines 3521 of the second touch electrode 352 may be formed in a shape corresponding to an overlapping portion of the color filter 410 or the barrier 361. The unit electrode lines 3511 of the first touch electrode 351 and the unit electrode lines 3521 of the second touch electrode 352 may be disposed in a region where the overlapping portion of the barrier 361 or the color filter 410 is disposed.

[0137] The pixel opening 365 may overlap with the openings of the first touch electrode 351 and the second touch electrode 352. In this case, the plurality of unit electrode lines 3511 and 3521 may not be disposed in the entire region of the overlapping portion or barrier 361 in which the color filters 410R, 410G, and 410B are disposed, and may overlap with the overlapping portion or barrier 361 of some color filters 410. That is, only one pixel opening 365 may be disposed between the plurality of unit electrode lines 3511 and 3521, but this is not restrictive. A plurality of pixel openings 365 may be disposed between the plurality of unit electrode lines 3511 and 3521.

[0138] The color filter 410 is disposed on the first touch unit 351a and the inorganic insulating layer 363. Figure 4 An exemplary embodiment of Fig.10 In an exemplary embodiment of the present invention, the color filter 410 may have a constant thickness in the central area CA and the edge area EA. Although the color filter 410 has a constant thickness, when the thickness h4-1 of the planarization layer 362 in the edge area EA is formed to be greater than the thickness h3-1 of the planarization layer 362 in the central area CA, the distance h3-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 in the central area CA and the distance h4-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 in the edge area EA may be approximately the same. The distances h3-2 and h4-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 are vertical distances of the topmost portion of the overlapping portion of the color filter 410 relative to the plane including the top surface of the organic emission layer 370.

[0139] For example, the difference between the distance h3-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 in the central area CA and the distance h4-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 in the edge area EA may be less than 7% of the distance h3-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 in the central area CA. Alternatively, the difference between the distance h3-3 from the top surface of the substrate 110 to the topmost portion of the overlapping portion of the color filter 410 in the central area CA and the distance h4-3 from the top surface of the substrate 110 to the topmost portion of the overlapping portion of the color filter 410 in the edge area EA may be less than 5% of the distance h3-3.

[0140] The overlapped area of ​​the color filter 410 is disposed in the non-emission area NLA where the barrier rib 361 is disposed. The overlapped area of ​​the color filter 410 is smaller than the non-emission area NLA where the barrier rib 361 is disposed, and the width of the overlapped area of ​​the color filter 410 is smaller than the width of the non-emission area NLA.

[0141] exist Fig.10 , areas in which the unit electrode lines 3511 are respectively provided in the central area CA and the edge area EA are shown, but this is an example and the above contents may be similarly applied to the entire areas of the central area CA and the edge area EA.

[0142] At the same time, the first touch unit 351a, the second touch unit 352a, and the second connection portion 352b can be switched in position with the first connection portion 351b. That is, the first touch unit 351a, the second touch unit 352a, and the second connection portion 352b can be disposed on the inorganic layer 301, and can be covered by the planarization layer 362 and the inorganic insulating layer 363. In this case, the first connection portion 351b can be disposed on the inorganic insulating layer 363.

[0143] Reference Fig.11 and Fig.12 , an OLED display according to another exemplary embodiment will be described. Fig.11 is a top plan view of a touch sensing layer included in an OLED display of another exemplary embodiment. The schematic layout and cross-sectional view of the OLED display of this exemplary embodiment are similar to Figure 6 and Figure 7 The schematic layout diagram and cross-sectional view are the same.

[0144] The touch sensing layer 350 includes a plurality of touch electrodes 356 all formed on the same layer and a plurality of wirings 31 respectively connected to the touch electrodes 356. The touch sensing layer 350 detects whether a touch occurs and the touch coordinates based on the capacitance formed between the touch electrode 356 and a pointed object such as a finger or a pen.

[0145] The touch area TA is an area where a touch is applied and can be sensed, and may overlap with the display area DA where an image is displayed. A plurality of touch electrodes 356 may be arranged in a matrix form and, in a cross-sectional view, may be formed on the same layer.

[0146] Each of the touch electrodes 356 may be formed in a quadrilateral shape, but is not limited thereto. In the touch area TA, the plurality of touch electrodes 356 are separated from each other, and the touch electrodes 356 may be connected to a sensing signal controller (not shown) through different wirings 31, respectively.

[0147] The touch electrode 356 may be formed in a grid pattern. In this case, the touch electrode 356 includes a plurality of unit electrode lines 3561, each of which has a small width and is arranged in parallel in a third direction and a fourth direction intersecting the third direction. The unit electrode lines 3561 arranged in the third direction and the unit electrode lines 3561 arranged in the fourth direction cross each other perpendicularly, so as to form a rhombus-shaped opening. That is, according to the arrangement of the unit electrode lines 3561, the grid pattern of the touch electrode 356 may have a constant lattice shape. The touch electrode 356 includes a rhombus-shaped opening, but this is not restrictive. The shape of the opening may be any shape such as a quadrilateral or a polygon. In addition, the third direction and the fourth direction in which the unit electrode lines 3561 extend are not limited to the inclined direction.

[0148] The touch electrode 356 of this exemplary embodiment receives a sensing input signal from a sensing signal controller (not shown) through wiring 31, and generates a sensing output signal according to the contact, and transmits the generated signal to the sensing signal controller. Each touch electrode 356 forms a self-sensing capacitor, thereby receiving a sensing input signal and then being charged with a predetermined charge. When touched by an external object such as a finger, the amount of charge charged into the self-sensing capacitor changes, so that a sensing output signal different from the sensing input signal can be output. Based on the sensing output signal, contact information such as whether contact is made and the contact position can be provided.

[0149] The wiring 31 may be provided on the same layer in which the touch electrode 356 is provided, and may be formed of the same material as the touch electrode 356. However, this is not restrictive, and the wiring 31 may be provided on a layer different from the layer in which the touch electrode 356 is provided, and thus may be connected to the touch electrode 356 through an additional connection portion.

[0150] Fig.12 Yes Fig.11 A cross-sectional view of a central area CA and an edge area EA of another OLED display of a touch sensing layer. Specifically, Fig.12 There is shown a cross section of a unit electrode line 3561 of the touch electrode 356. Description of the same configuration as that described above will be omitted.

[0151] Reference Fig.12 , an inorganic layer 301 is provided on the encapsulation layer 300, and a planarization layer 362 is provided on the inorganic layer 301. The planarization layer 362 may include an organic material such as an acrylic-based resin. The thickness of the planarization layer 362 is greater in the edge area EA than in the central area CA. In the central area CA and the edge area EA, the distance from the substrate 110 to the top surface of the planarization layer 362 is constant.

[0152] An inorganic insulating layer 363 is provided on the planarization layer 362. The inorganic insulating layer 363 may include, for example, silicon nitride (SiN x ) or silicon oxide (SiO x ) of inorganic materials.

[0153] The unit electrode line 3561 of the touch electrode 356 is arranged on the inorganic insulating layer 363. On the plane, the unit electrode line 3561 of the touch electrode 356 may have a shape corresponding to the overlapping portion or the barrier 361 of the color filter 410. The unit electrode line 3561 of the touch electrode 356 may be arranged in a region where the barrier 361 or the overlapping portion of the color filter 410 is provided. The pixel opening 365 may overlap with the opening of the touch electrode 356. In this case, the plurality of unit electrode lines 3561 may not be arranged in the entire region where the overlapping portion or the barrier 361 of the color filters 410R, 410G and 410B are provided, and may overlap with the overlapping portion or the barrier 361 of some color filters 410. That is, only one pixel opening 365 may be provided between the plurality of unit electrode lines 3561, but this is not restrictive. A plurality of pixel openings 365 may be provided between the plurality of unit electrode lines 3561.

[0154] The color filter 410 is disposed on the touch electrode 356. Figure 4 According to the present exemplary embodiment, the thickness of the color filter 410 may be constant in the central area CA and the edge area EA.

[0155] Although color filter 410 has a constant thickness, when thickness h6-1 of planarization layer 362 in edge area EA is formed to be greater than thickness h5-1 of planarization layer 362 in central area CA, distance h5-2 from the top surface of organic emission layer 370 to the topmost portion of overlapped portion of color filter 410 in central area CA and distance h6-2 from the top surface of organic emission layer 370 to the topmost portion of overlapped portion of color filter 410 in edge area EA may be approximately the same. Distances h5-2 and h6-2 from the top surface of organic emission layer 370 to the topmost portion of overlapped portion of color filter 410 are vertical distances of the topmost portion of overlapped portion of color filter 410 relative to a plane including the top surface of organic emission layer 370.

[0156] For example, the difference between the distance h5-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 in the central area CA and the distance h6-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 in the edge area EA may be less than 7% of the distance h5-2 from the top surface of the organic emission layer 370 to the topmost portion of the overlapping portion of the color filter 410 in the central area CA. Alternatively, the difference between the distance h5-3 from the top surface of the substrate 110 to the topmost portion of the overlapping portion of the color filter 410 in the central area CA and the distance h6-3 from the top surface of the substrate 110 to the topmost portion of the overlapping portion of the color filter 410 in the edge area EA may be less than 5% of the distance h5-3.

[0157] exist Fig.12, an area in which a single unit electrode line 3561 is provided in the central area CA and the edge area EA is shown, but this is an example and the above contents may be similarly applied to the entire area of ​​the central area CA and the edge area EA.

[0158] While the inventive concept has been described in conjunction with what are presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the disclosure.

[0159] <Description of Reference Signs>

[0160] 10, 20: display panel 110: substrate

[0161] 191: Pixel electrode 200: Display layer

[0162] 250: Pixel circuit 270: Common electrode

[0163] 300: Encapsulation layer 301: Inorganic layer

[0164] 350: touch sensing layer 351: first touch electrode

[0165] 352: second touch electrode 356: touch electrode

[0166] 361: Barrier 362: Planarization layer

[0167] 363: Inorganic insulating layer 370: Organic emission layer

[0168] 410: Color filter 420: Overlay

[0169] CA: Central Area EA: Edge Area

Claims

1. An organic light emitting diode display, wherein: The organic light emitting diode display comprises: A substrate, the substrate comprising a display area and a non-display area; A pixel circuit, wherein the pixel circuit is arranged in the display area; An organic light emitting diode and a barrier rib, wherein the organic light emitting diode and the barrier rib are arranged on the pixel circuit; an encapsulation layer, the encapsulation layer covering the pixel circuit, the organic light emitting diode and the barrier; and a color filter, wherein the color filter is disposed on the encapsulation layer, The encapsulation layer includes: an edge region, in the display region, the edge region is adjacent to the non-display region; and a central region, the central region is not directly adjacent to the non-display region and the edge region is disposed between the central region and the non-display region. The edge region and the central region include a plurality of emission regions, The color filter includes a first color filter, a second color filter, a third color filter, and an overlapping portion where the first color filter, the second color filter, and the third color filter overlap, The overlapping portion is provided in a region in which the barrier is provided, A thickness of a first portion of the encapsulation layer in the central region is greater than a thickness of a second portion of the encapsulation layer in the edge region, and A thickness of the color filter overlapping the second portion in the edge region is greater than a thickness of the color filter overlapping the first portion in the central region.

2. The organic light emitting diode display according to claim 1, wherein: The organic light emitting diode includes an organic emission layer, and The difference between the distance from the top surface of the organic emission layer to the topmost portion of the overlapping portion of the color filter in the central area and the distance from the top surface of the organic emission layer to the topmost portion of the overlapping portion of the color filter in the edge area is less than 7% of the distance from the top surface of the organic emission layer to the topmost portion of the overlapping portion of the color filter in the central area.

3. The organic light emitting diode display according to claim 2, wherein: The edge region surrounds the central region, and The thickness of the encapsulation layer in the edge region is less than 90% of the maximum thickness of the encapsulation layer in the central region.

4. The organic light emitting diode display according to claim 1, wherein: A difference between a distance from the substrate to the top surface of the overlapping portion in the central region and a distance from the substrate to the top surface of the overlapping portion in the edge region is less than 5% of the distance from the substrate to the top surface of the overlapping portion in the central region.

5. An organic light emitting diode display, wherein: The organic light emitting diode display comprises: A substrate, the substrate comprising a display area and a non-display area; A pixel circuit, wherein the pixel circuit is arranged in the display area; An organic light emitting diode and a barrier rib, wherein the organic light emitting diode and the barrier rib are arranged on the pixel circuit; an encapsulation layer, the encapsulation layer covering the pixel circuit, the organic light emitting diode and the barrier; a touch sensing layer, the touch sensing layer being disposed on the encapsulation layer; and a color filter, the color filter being disposed on the touch sensing layer, The encapsulation layer includes: an edge region, in the display region, the edge region is adjacent to the non-display region; and a central region, the central region is not directly adjacent to the non-display region and the edge region is disposed between the central region and the non-display region. The edge region and the central region include a plurality of emission regions, The touch sensing layer includes a planarization layer and a touch electrode. The thickness of a first portion of the encapsulation layer in the central region is greater than the thickness of a second portion of the encapsulation layer in the edge region, The thickness of the planarization layer overlapping the second portion in the edge region is greater than the thickness of the planarization layer overlapping the first portion in the central region, and The color filter includes a first color filter, a second color filter, a third color filter, and an overlapping portion where the first color filter, the second color filter, and the third color filter overlap.

6. The organic light emitting diode display according to claim 5, wherein: The organic light emitting diode includes an organic emission layer, and The difference between the distance from the top surface of the organic emission layer to the topmost portion of the overlapping portion of the color filter in the central area and the distance from the top surface of the organic emission layer to the topmost portion of the overlapping portion of the color filter in the edge area is less than 7% of the distance from the top surface of the organic emission layer to the topmost portion of the overlapping portion of the color filter in the central area.

7. The organic light emitting diode display according to claim 6, wherein: The touch sensing layer also includes an inorganic insulating layer, The touch electrodes include first touch electrodes and second touch electrodes, The first touch electrode and the second touch electrode each include a plurality of unit electrode lines, The first touch electrode includes a plurality of first touch units arranged along a first direction and a plurality of first connection parts connecting the plurality of first touch units, and The second touch electrode includes a plurality of second touch units arranged along a second direction crossing the first direction and a plurality of second connection parts connecting the plurality of second touch units.

8. The organic light emitting diode display according to claim 7, wherein: The first connecting portion is arranged on the packaging layer, The planarization layer and the inorganic insulating layer are sequentially disposed on the first connecting portion, The first touch unit, the second touch unit and the second connection portion are disposed on the inorganic insulating layer, The first touch unit is also disposed in an opening formed in the planarization layer and the inorganic insulating layer so that the first touch unit is connected to the first connection portion. The first touch electrode receives a first touch signal for sensing a coordinate value in the second direction, and The second touch electrode receives a second touch signal for sensing a coordinate value in the first direction.

9. The organic light emitting diode display according to claim 8, wherein: The planarization layer includes an organic material, and The inorganic insulating layer includes silicon nitride or silicon oxide.

10. The organic light emitting diode display according to claim 6, wherein: The touch sensing layer further comprises: an inorganic insulating layer disposed on the planarization layer; and wiring, the wiring being connected to the touch electrode, Wherein, the touch electrode is arranged on the inorganic insulating layer, The touch electrode includes a plurality of unit electrode lines. The planarization layer includes an organic material, and The inorganic insulating layer includes silicon nitride or silicon oxide.

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