KR20200059551A - Organic light emitting display device and manufacturing method for cover window of the same - Google Patents

Abstract

An organic light emitting display device according to one embodiment of the present invention comprises: a display panel for displaying an image; and a cover window positioned on an upper part of the display panel. The cover window comprises an optic angle adjusting structure for adjusting a viewing range of the image displayed on the display panel and improving brightness thereof.

Description

Manufacturing method of organic light emitting display device and cover window thereof {ORGANIC LIGHT EMITTING DISPLAY DEVICE AND MANUFACTURING METHOD FOR COVER WINDOW OF THE SAME}

The present specification relates to an organic light emitting display device.

The organic light emitting display device is a device that displays an image by controlling the amount of light emitted by the organic light emitting element. The organic light emitting device (organic light emitting diode, etc.) has the advantage that it can be thinned as a self light emitting device using a thin light emitting layer between electrodes. A typical organic light emitting display device has a structure in which a pixel driving circuit and an organic light emitting device are formed on a substrate, and light emitted from the organic light emitting device passes through the substrate or the barrier layer to display an image.

Since the organic light emitting display device is implemented without a separate light source device, it can be manufactured thinner and lighter than a conventional display device such as a liquid crystal display (LCD). Therefore, the organic light emitting display device can be designed in various forms because it is easy to be implemented as a flexible, bendable, or foldable display device.

Accordingly, the organic light emitting display device, as well as traditional electronic devices such as TV, automotive instrument panel, indoor and outdoor advertising boards are expanding its scope of application in various fields. At this time, optimization for each display device use environment is required, and in some cases, a unique structure and a complementary member reflecting the use environment may be further added to the organic light emitting display device.

This specification aims to propose an organic light emitting display device and a cover window used therein. In addition, the present specification provides a viewing angle adjustment structure integrated with the cover member.

The tasks of the present specification are not limited to the above-mentioned tasks, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the object as described above, the organic light emitting display device according to an embodiment of the present invention includes a display panel for displaying an image and a cover window on the top of the display panel. The cover window includes a wide-angle adjustment structure that adjusts a viewing range of an image displayed on the display panel and increases luminance. The wide angle adjustment structure includes a light blocking unit blocking light incident at a predetermined angle or more toward the cover window, a light reflecting unit contacting one side of the light blocking unit and reflecting light incident toward the cover window, and less than the predetermined angle It includes a light transmitting portion for transmitting the incident light.

Specific details of other embodiments are included in the detailed description and drawings.

Embodiments of the present specification, it is possible to provide a cover window of the organic light emitting display device having a viewing angle adjustment function. At the same time, embodiments of the present specification may provide the viewing angle adjustment function while minimizing the increase in the thickness and manufacturing cost of the organic light emitting display device. In addition, embodiments of the present specification may provide a function capable of compensating for a decrease in luminance due to a viewing angle adjustment functional layer.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is an exploded view schematically illustrating an organic light emitting display device according to an exemplary embodiment of the present specification.
2 is a cross-sectional view illustrating a part of the display panel included in the organic light emitting display device of FIG. 1.
3A to 3D are views illustrating a cover member according to an embodiment of the present specification.
4A to 4G are views illustrating a method of manufacturing a cover member according to an embodiment of the present specification.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and the ordinary knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for describing the embodiments of the present invention are exemplary and the present invention is not limited to the illustrated matters. The same reference numerals refer to the same components throughout the specification. In addition, in the description of the present invention, when it is determined that detailed descriptions of related known technologies may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. When 'include', 'have', 'consist of', etc. mentioned in this specification are used, other parts may be added unless '~ man' is used. When a component is expressed as a singular number, the plural number is included unless otherwise specified.

In interpreting the components, it is interpreted as including the error range even if there is no explicit description.

In the case of the description of the positional relationship, for example, if the positional relationship of two parts is described as '~ top', '~ upper', '~ bottom', '~ side', etc., 'right' Alternatively, one or more other parts may be located between the two parts unless 'direct' is used.

An element or layer being referred to as being "on" another element or layer includes all instances of another layer or other element immediately above or in between.

Although the first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another component. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

The same reference numerals refer to the same components throughout the specification.

The size and thickness of each component shown in the drawings are illustrated for convenience of description, and the present invention is not necessarily limited to the size and thickness of the illustrated component.

Each of the features of the various embodiments of the present invention may be partially or totally combined or combined with each other, and technically various interlocking and driving may be possible as those skilled in the art can fully understand, and each of the embodiments may be implemented independently of each other. It can also be implemented together in an associative relationship.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The organic light emitting display device `1000 may include a display panel 100 for displaying an image, a functional member 200, a cover member 300, and various mechanical parts (frame, case, etc.).

The display panel 100 includes at least one active area, and pixels, which are a basic unit of display, are arranged in an array in the display area. One or more inactive areas may be disposed around the display area. That is, the non-display area may be adjacent to one or more side surfaces of the display area. The display area and the non-display area may be in a form (pentagonal, hexagonal, circular, elliptical, etc.) suitable for the design of the electronic device on which the organic light emitting display device 1000 is mounted.

Each pixel in the display area may be associated with a pixel circuit. The pixel circuit may include one or more switching transistors and one or more driving transistors on a backplane. Each pixel circuit may be electrically connected to a gate line and a data line to communicate with one or more driving circuits such as a gate driver and a data driver located in the non-display area. The driving circuit may be implemented as a thin film transistor (TFT) in the non-display area. Such a driving circuit may be referred to as a gate-in-panel (GIP). In addition, some components, such as data driver ICs, are mounted on separate printed circuit boards, and are used for circuit films such as flexible printed circuit board (FPCB), chip-on-film (COF), and tape-carrier-package (TCP). It may be combined with a connection interface (pad / bump, pin, etc.) disposed in the non-display area. The display panel 100 may also include various additional elements for generating various signals or driving pixels in the display area. The additional elements may include inverter circuits, multiplexers, electro static discharge circuits, and the like.

The functional member 200 may be provided to reinforce mechanical / mechanical and optical properties required for the organic light emitting display device 1000. The functional member 200 may also include additional elements associated with functions other than pixel driving. For example, the functional member 200 may include additional elements that provide a touch sensing function, a user authentication function (eg, fingerprint recognition), a multi-level pressure sensing function, a tactile feedback function, and the like. In addition, the functional member 200 may include a polarizer or the like that controls display characteristics (eg, external light reflection, color accuracy, luminance, etc.). The functional member 200 may be attached to the top surface of the display panel 100 by an adhesive.

The cover member 300 is attached to protect the display panel 100 and the functional member 200 thereon. The cover member 300 may be made of a transparent material (glass, plastic, etc.) so that the display area is visible. However, an opaque shield (see 350 in FIG. 3A) is provided on the cover member 300 in a portion (eg, non-display area) that is not desired to be viewed by the user. The cover member 300 is attached to the upper surface of the functional member 200 by a transparent adhesive such as OCA (Optical Clear Adhesive) to transmit light emitted from the display panel 100 to the outside and display from external impact The panel 100 and the functional member 200 are protected. The cover member 300 according to the exemplary embodiment of the present specification may further include a wide-angle adjustment structure for adjusting a viewing range of an image displayed on the display panel 100, details of which will be described below with reference to FIG. 3. .

2 is a cross-sectional view illustrating a part of the display panel included in the organic light emitting display device of FIG. 1.

In the display panel 100, thin film transistors 102, 104, 106, 108, organic light emitting devices 112, 114, 116 and various functional layers are positioned on the base layer 101.

The base layer 101 supports various components of the display panel 100. The base layer 101 may be formed of a transparent insulating material, for example, an insulating material such as glass or plastic. When the base layer 101 is made of plastic, it may be referred to as a plastic film or plastic substrate. For example, the base layer 101 may be in the form of a film including one selected from the group consisting of polyimide polymers, polyester polymers, silicone polymers, acrylic polymers, polyolefin polymers, and copolymers thereof. Among these materials, polyimide is widely used as a plastic substrate because it can be applied to high temperature processes and is a material that can be coated. The substrate (array substrate) is also referred to as a concept including a device and a functional layer formed on the base layer 101, for example, a switching TFT, a driving TFT connected to the switching TFT, an organic light emitting element connected to the driving TFT, a protective film, and the like. do.

A buffer layer may be located on the base layer 101. The buffer layer is a functional layer for protecting a thin film transistor (TFT) from impurities such as alkali ions flowing out of the base layer 101 or lower layers. The buffer layer may be made of silicon oxide (SiOx), silicon nitride (SiNx), or multiple layers thereof.

A thin film transistor is placed on the base layer 101 or the buffer layer. The thin film transistor may have a form in which the semiconductor layer 102, the gate insulating film 103, the gate electrode 104, the interlayer insulating film 105, and the source and drain electrodes 106 and 108 are sequentially arranged. The semiconductor layer 102 is located on the base layer 101 or the buffer layer. The semiconductor layer 102 may be made of polysilicon (p-Si), in which case a predetermined region may be doped with impurities. Further, the semiconductor layer 102 may be made of amorphous silicon (a-Si), or may be made of various organic semiconductor materials such as pentacene. Furthermore, the semiconductor layer 102 may be made of oxide. The gate insulating layer 103 may be formed of an insulating inorganic material such as silicon oxide (SiOx) or silicon nitride (SiNx), or may be formed of an insulating organic material. The gate electrode 104 may be made of various conductive materials, such as magnesium (Mg), aluminum (Al), nickel (Ni), chromium (Cr), molybdenum (Mo), tungsten (W), gold (Au), or alloys thereof. And the like.

The interlayer insulating layer 105 may be formed of an insulating material such as silicon oxide (SiOx) or silicon nitride (SiNx), or may be formed of an insulating organic material. Selective removal of the interlayer insulating layer 105 and the gate insulating layer 103 may cause contact holes in which source and drain regions are exposed.

The source and drain electrodes 106 and 108 are formed of a single layer or a multi-layer shape as an electrode material on the interlayer insulating layer 105.

The planarization layer 107 can be located on the thin film transistor. The planarization layer 107 protects the thin film transistor and planarizes the top. The planarization layer 107 may be formed in various forms, such as an organic insulating film such as Benzocyclobutene (BCB) or acrylic (Acryl), or an inorganic insulating film such as a silicon nitride film (SiNx) or a silicon oxide film (SiOx). Various modifications are possible, such as being formed in a single layer or composed of double or multiple layers.

The organic light emitting device may have a shape in which the first electrode 112, the organic light emitting layer 114, and the second electrode 116 are sequentially arranged. That is, the organic light emitting device includes a first electrode 112 formed on the planarization layer 107, an organic light emitting layer 114 positioned on the first electrode 112, and a second electrode located on the organic light emitting layer 114 ( 116).

The first electrode 112 is electrically connected to the drain electrode 108 of the driving thin film transistor through the contact hole. When the display panel 100 is a top emission method, the first electrode 112 may be made of an opaque conductive material having high reflectance. For example, the first electrode 112 may be formed of silver (Ag), aluminum (Al), gold (Au), molybdenum (Mo), tungsten (W), chromium (Cr), or alloys thereof. .

The bank 110 is formed in regions other than the emission region. Accordingly, the bank 110 has a bank hole exposing the first electrode 112 corresponding to the emission region. The bank 110 may be made of an inorganic insulating material such as a silicon nitride film (SiNx) or a silicon oxide film (SiOx) or an organic insulating material such as BCB, acrylic resin or imide resin.

The organic light emitting layer 114 is positioned on the first electrode 112 exposed by the bank 110. The organic light emitting layer 114 may include a light emitting layer, an electron injection layer, an electron transport layer, a hole transport layer, a hole injection layer, and the like. The organic light emitting layer may have a single light emitting layer structure that emits one light, or may include a plurality of light emitting layers, and may have a structure that emits white light by mixing light emitted from these multiple light emitting layers.

The second electrode 116 is positioned on the organic light emitting layer 114. When the display panel 100 is a top emission type, the second electrode 116 is a transparent conductive material such as Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO), or It is formed of a reflective transmissive metal alloy such as an MgAg alloy to emit light generated from the organic light emitting layer 114 onto the second electrode 116.

The protective layer 118 and the encapsulation layer 120 are positioned on the second electrode 116. The encapsulation layer 120 prevents oxygen and moisture penetration from outside in order to prevent oxidation of the light emitting material and the electrode material. When the organic light emitting device is exposed to moisture or oxygen, a pixel shrinkage phenomenon in which the light emitting region is reduced may occur, or a dark spot in the light emitting region may occur. The encapsulation layer may be made of an inorganic film made of a glass, metal, aluminum oxide (AlOx) or silicon (Si) -based material, or may have a structure in which an organic film and an inorganic film are alternately stacked. The inorganic film serves to block the penetration of moisture or oxygen, and the organic film serves to flatten the surface of the inorganic film. The reason for forming the encapsulation layer as a multi-layered thin film layer is to make the movement path of moisture or oxygen longer and more complicated than a single layer, making it difficult to penetrate moisture / oxygen to the organic light emitting device.

In order to increase the strength and / or rigidity of the display panel 100, one or more support layers 180 may be provided below the base layer 101. The support layer 180 is attached to the opposite side (second side) of the side (first side) where the organic light emitting element is located on both sides of the base layer 101. The support layer 180 is polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyethylene ether phthalate (polyethylene ether phthalate), polycarbonate (polycarbonate), polyarylate (polyarylate), poly It may be made of a thin film composed of a combination of polyether imide, polyether sulfonate, polyimide, polyacrylate or other suitable polymer. Other suitable materials that may be used to form the support layer 180 may be thin glass, a metal foil shielded with a dielectric, a multi-layer polymer, a polymer film containing a polymer material in combination with nanoparticles or microparticles, and the like. have.

3A and 3B are diagrams illustrating a cover member according to an embodiment of the present specification.

3A is a plan view of the cover member 300 according to one embodiment of the present specification, and FIG. 3B is a cross-sectional view thereof. The cover member 300 is on a display surface where a viewer views the image, and is also called a cover window in that the image is transmitted as a kind of transparent film or glass. The cover member 300 is positioned on an upper portion of the display panel displaying an image. In addition, the cover member 300 may include wide-angle adjustment structures 320 and 330 provided to adjust a viewing range of an image displayed on the display panel. In other words, the wide angle adjustment structures 320 and 330 adjust the viewing angle of the organic light emitting display device to suit the use environment.

Some display devices need to have a large viewing angle so that multiple users can see them together, but for certain display devices, the viewing angle may be limited to a specific range. For example, in the case of a vehicle display device, the viewing angle needs to be adjusted so that the image appearing on the display screen does not appear on the (front or side) window. The range and level of the viewing angle adjustment (especially in the upper direction) of the display device varies depending on the manufacturer's request to make the device employing the display device.

In the case of an organic light emitting display device that requires adjustment of a viewing angle in a specific direction, including a vehicle display device, an attempt has been made to meet the requirements by additionally disposing an optical film. However, attaching a separate optical film to the organic light emitting display device as described above is accompanied by a difficulty of adding a material (film, adhesive, etc.) as well as a lamination process. Therefore, it is necessary to accept the possibility of defects in the bonding process. Moreover, the thickness of the organic light emitting display device is also significantly increased due to the addition of the optical film and adhesive, and the luminance of the display device is reduced due to a decrease in transmittance due to the film and adhesive.

Accordingly, the inventors of the present invention have studied a solution (an angle-of-view adjustment method) that minimizes an increase in manufacturing cost and process time / complexity and improves luminance reduction. The cover member 300 according to an embodiment of the present specification, which is derived according to the study as described above, may integrate a wide angle adjustment structure therein.

Referring to Figure 3a, the wide-angle adjustment structure (320, 330) is arranged to extend the wide-angle adjustment structure 320 in the horizontal direction to adjust the viewing angle in the vertical direction. If you want to adjust the viewing angle in the left and right direction, the wide angle adjustment structure 320 will extend in the vertical direction.

The wide angle adjustment structures 320 and 330 are disposed on one surface of the transparent substrate 310 made of glass or plastic. The wide-angle adjustment structure (320, 330), when viewed in cross-section, as shown in Figure 3b, the light blocking unit 321 for blocking light incident at a predetermined angle or more toward the cover member, the light incident less than the predetermined angle It may include a light reflection unit 322 that is below the light transmission unit 330 and the light blocking unit 321 that transmits light and reflects light incident on the cover member 300 from the display panel. The light reflection unit 322 is positioned closer to the display panel 100 than the light blocking unit 321 to reflect light incident from the display panel toward the cover member 300 at the bottom of the wide-angle adjustment structure 320. . The light blocking unit 321 may be a polymer material (resin, etc.) including a light absorbing material (black pigment, dye, etc.) capable of blocking (or absorbing) light. The light reflector 322 may be a polymer material (resin, etc.) including a reflective material (titanium oxide, zinc emulsion, light white, lithopone, etc.) that can reflect light, and has a reflectivity of a predetermined or higher (eg, 90% or higher) Can have In addition, the light transmitting portion 330 may be a polymer material (eg, acrylic, etc.) having a transmittance of a predetermined or more (eg, 80 percent or more). The light transmitting unit 330 includes a light blocking unit 321 for blocking light incident over a predetermined angle and a light reflecting unit 322 that transmits reflection of the incident light. It is filled in the rest of the area except for the shielding layer 350 forming portion to shield.

Light traveling in parallel or below a certain angle with respect to the height direction (the vertical direction in FIG. 3B) of the light blocking unit 321 passes through the wide angle adjustment structure (and the transparent substrate). However, light traveling at a predetermined angle or higher with respect to the height direction of the light blocking unit 321 is blocked by the light blocking unit 321. Therefore, as shown in FIG. 3C, as the viewing angle increases in the vertical direction, the amount of light emitted in the corresponding direction decreases. Therefore, in view of the view, the screen is not recognized above a specific viewing angle. That is, an image emitted from the display device is not reflected at a viewing angle greater than a specific criterion (eg, an upper 45 °).

The light blocking unit 321, which performs a main role of blocking light, may have a column shape having a circle, ellipse, or polygonal horizontal cross section. Particularly, the light blocking unit 321 may have a column shape in which a cross-sectional area becomes smaller as the display panel 100 moves toward the transparent substrate 310. At this time, the light blocking unit 321 may have a trapezoidal cross section in the height direction (vertical direction). The trapezoidal hypotenuse has a slope in consideration of blocking and transmission of light. When the viewing angle in the vertical (or left and right) directions is differently implemented, the trapezoid of the trapezoid may have asymmetry, that is, different slopes.

The light blocking unit 321 has a height and an arrangement pitch based on a predetermined angle to block or transmit. That is, the larger the wide angle to be blocked (the smaller the viewing angle is to be implemented), the higher the light blocking portion 321 may be or the narrower the arrangement interval may be. In addition, the light blocking unit 321 has a width of about 20 to 30 micrometers (μm), which is hardly recognized by the human visual field. For example, the light blocking portion 321 may be arranged at a height of about 100 μm and an interval of about 39 μm to provide a viewing angle of about 30 °.

The light reflection unit 322 is positioned to contact one side of the light blocking unit 321. For example, the light reflection unit 322 may be disposed between the light blocking unit 321 and the display panel to contact the lower surface of the light blocking unit. The thickness of the light reflection unit 322 may be determined in a range in which the characteristics of the corresponding viewing angle do not change after the height and the arrangement interval based on a predetermined angle to be blocked or transmitted by the light blocking unit 321 are determined. Referring to FIG. 3D, the light reflection unit 322 reflects light emitted from the display panel 100 and incident toward the cover member 300. The light reflected from the light reflection unit 322 is reflected back from the display panel 100 and then enters the cover member 300 again. That is, the light reflected by the light reflection unit 322 is recycled to increase the brightness of the display device. In addition, when maintaining the same luminance, the power consumption of the organic light emitting device can be reduced, and the power consumption reduction can lead to an improvement in the life of the organic light emitting device.

The cover member 300 has a shielding layer 350 covering an outer portion of a portion where an image is displayed on one surface on which the wide-angle adjustment structures 320 and 330 are disposed. The shielding layer 350 may be an opaque mask layer such as black ink (eg, a polymer filled with carbon black). At this time, the shielding layer 350 and the light blocking unit 321 may be substantially the same color black, and the shielding layer 350 and the light blocking unit 321 implemented as described above hardly feel a difference in color. . For example, a color difference between the shielding layer 350 and the light blocking unit 321 may be 3 or less. Here, the color difference is a difference between two colors defined according to the difference ΔL *, Δa *, Δb * of the coordinate L * a * b * in the L * a * b * color display, as ΔE as shown in Equation 1 below. Is displayed.

Here, L * is reflected luminance, and a * and b * are CIE color coordinates.

The cover member 300 is adhered to the display panel 100 or the functional member 200 with an adhesive such as OCA.

The cover member 300 according to the above-described embodiment of the present specification can adjust the viewing angle of the organic light emitting display device without the need to add a separate optical film. Accordingly, an increase in the thickness and manufacturing cost of the organic light emitting display device is effectively suppressed. In addition, since the manufacturing process of the organic light emitting display device using the cover member 300 is simple compared to the process of adding a separate optical film, manufacturing defects may be significantly reduced. In addition, the light reflected by the light reflection unit 322 is recycled to increase the luminance of the display device.

4A to 4G are views illustrating a method of manufacturing a cover member according to an embodiment of the present specification.

The cover member 300 is positioned on the top surface of the organic light emitting display device to protect the display panel 100 and / or the functional member 200 from external impact. Furthermore, the cover member 300 is provided with a wide-angle adjustment structure (320, 330) to maintain the viewing angle of the organic light emitting display device below a certain range. The cover member may also be referred to as a cover window.

An example of a method for manufacturing a cover window of an organic light emitting display device is as follows. First, as shown in FIG. 4A, a shielding layer 350 is formed on one surface of the transparent substrate 310 to cover the outside of the portion where the image is displayed. The shielding layer 350 is disposed to correspond to the non-display area of the display panel 100, so that various additional elements (circuit, wiring, etc.) placed in the non-display area may be hidden. The transparent substrate 310 may be glass or plastic, and the shielding layer 350 may be placed on one surface in the direction of the display panel. The shielding layer 350 is also called a black matrix.

Next, as shown in FIG. 4B, a first transparent resin 330a is applied to one surface of the transparent substrate 310 surrounded by the shielding layer 350. The first transparent resin 330a is the same material as the light transmitting portion 330 described in FIG. 3B, and is, for example, a polymer material (eg, polyester-based, acrylic, etc.) having a transmittance of a predetermined or more (eg, 80 percent or more). Can be. At this time, the first transparent resin 330a may be formed up to the surface of the shielding layer 350 and, as shown in FIG. 4B, covers the shielding layer 350 and has a certain thickness over the shielding layer 350. It may be.

Next, as shown in FIG. 4C, the first transparent resin 330a is pressed into the molding frame 400 to form a groove to be filled with a wide angle adjustment pattern. The wide angle adjustment pattern is the same as the light blocking unit 321 described in FIG. 3B. The groove to be filled with the light blocking material has a predetermined height and spacing, and the predetermined height and spacing is determined based on an angle at which emission from the light incident toward the cover window 300 is blocked. . The detailed description thereof is substantially the same as the description of the light blocking unit 321 described in FIG. 3B. As can be seen from the drawing, the separation groove after compression of the molding frame 400, that is, the molding frame (mold) presses the transparent resin to make the groove shape and then increases the convenience of the movement to move upward as shown in the groove It is good to be trapezoidal. This trapezoidal groove shape is likely to be maintained even during separation of the forming mold.

Next, as shown in FIG. 4D, the transparent resin 330 in which the groove is formed is cured. The curing may be performed by ultraviolet curing or thermal curing according to a method suitable for the properties of the transparent resin 330.

When the transparent resin 330 is cured, as shown in FIG. 4E, the opaque resin 321 is filled in the groove and cured as shown in FIG. 4E to complete the light blocking unit 321. Similarly, the curing may be performed by ultraviolet curing, thermal curing, etc. in a manner suitable for the properties of the opaque resin constituting the light blocking portion 321.

After the light blocking unit 321 is completed, the light blocking unit 321 is contacted to form the light reflection unit 322, which will be described with reference to FIGS. 4F to 4G.

The light reflection unit 322 is formed to be smaller than the height of the light blocking unit 321 so that the viewing angle characteristic of the completed wide angle adjustment pattern is not changed. The second transparent resin 330b is applied to the upper portion of the light blocking unit 321 completed in FIG. 4E by the same process described in FIG. 4B. The second transparent resin 330b is the same material as the first transparent resin 330a described with reference to FIG. 4B, and may be, for example, a polymer material having a transmittance of a predetermined or more (eg, 80 percent or more). After the transparent resin is applied, the portion on which the light reflection unit 322 is to be formed, that is, the second transparent resin 330b on the light blocking unit 321 is removed through mask exposure and development.

Next, as described in FIG. 4D, the second transparent resin 330b from which the portion where the light reflection unit 322 is to be formed is removed is cured. Curing may be performed by light (UV) curing or thermal curing according to an appropriate method to suit the properties of the transparent resin. When the second transparent resin 330b is cured, since it is the same material as the transparent resin 330 of FIG. 4E, it is not distinguished by other layers after curing.

Next, as shown in FIG. 4G, the second transparent resin 330b is filled with a resin having reflective properties and cured to complete the light reflecting portion 322. Likewise, curing may be performed by ultraviolet curing or thermal curing according to an appropriate method to suit the characteristics of a resin having reflective properties. The surface of the wide angle adjustment pattern 320 on which the light reflection unit 322 is formed may be uneven. Therefore, it is possible to planarize the surface by performing a grinding process.

The cover window 300 manufactured as shown in FIGS. 4A to 4G is attached to the display panel 100 or a functional member 200 on the top thereof with the configuration shown in FIG. 4G reversed upside down, and the organic light emitting display device 1000. To complete. The organic light emitting display device 1000 adjusts the angle at which an image is viewed through the wide angle adjustment pattern included in the cover window and increases the luminance of the organic light emitting display device 1000.

An organic light emitting display device according to an exemplary embodiment of the present invention may be described as follows.

An organic light emitting display device according to an exemplary embodiment of the present invention includes a display panel for displaying an image; And a cover window positioned on the display panel. The cover window may include a wide-angle adjustment structure that adjusts a viewing range of an image displayed on the display panel and increases luminance. The wide angle adjustment structure includes: a light blocking unit blocking light incident at a predetermined angle or more toward a cover window; It may be in contact with one side of the blocking portion, and may include a light reflecting portion reflecting light incident toward the cover window and a light transmitting portion transmitting light incident below a predetermined angle.

The light blocking unit may adjust a viewing angle of an image displayed on the display panel in a column shape having a height and an arrangement interval based on a predetermined angle. The light reflector may be provided to increase luminance by reflecting light incident on the display panel from the display panel and then reflecting the light again on the display panel.

The light blocking unit and the light reflection unit may have a smaller cross-sectional area toward the direction away from the display panel, and the cross-section in the height direction may have a trapezoidal shape. The trapezoidal hypotenuse has a slope in consideration of blocking and transmitting light, and may be asymmetric.

The light blocking unit may be a polymer including a light absorbing material, and the light reflecting unit may be a polymer including a material that reflects light. The light reflector may have a reflectance of at least 95 percent. The polymer of the light reflection unit may include at least one or more of titanium oxide, zinc emulsion, light white, and lithopone. The light transmitting portion may be a polymer material having a transmittance of at least 80 percent.

The cover window may have a wide-angle adjustment structure disposed on one surface of a transparent base material made of glass or plastic, and may have a shielding layer covering an outer surface of a portion where an image is displayed on the surface where the wide-angle adjustment structure is disposed. That is, the wide-angle adjustment structure is integrated with the cover window, so that the viewing angle of the organic light emitting display device can be adjusted without the need to add a separate optical film.

Although the embodiments of the present specification have been described in detail with reference to the accompanying drawings, the present specification is not necessarily limited to these embodiments, and may be variously modified without departing from the technical spirit. Therefore, the embodiments disclosed in the present specification are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. Each of the features of the various embodiments of the present invention may be partially or wholly combined with or combined with each other, and may be technically interlocked and driven by a person skilled in the art, and each of the embodiments may be implemented independently of each other or together in an associative relationship. It may be practiced. The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present invention.

100: display panel
101: base layer
102: semiconductor layer
103: gate insulating film
104: gate electrode
105: interlayer insulating film
106: source electrode
107: flattening layer
108: drain electrode
110: bank
112: first electrode
114: organic light emitting layer
116: second electrode
118: protective layer
120: sealing layer
200: functional layer
300: cover member

Claims (19)

A display panel for displaying an image;
It includes a cover window located on the top of the display panel,
The cover window is an organic light emitting display device having a wide-angle adjustment structure that adjusts a viewing range of an image displayed on the display panel and increases luminance. According to claim 1,
The wide angle adjustment structure,
Light blocking unit for blocking light incident at a predetermined angle or more toward the cover window,
A light reflecting part contacting one side of the light blocking part and reflecting light incident toward the cover window;
An organic light emitting display device including a light transmitting portion that transmits light incident below the predetermined angle. According to claim 2,
The light blocking unit is an organic light emitting display device having a column shape having a height and an arrangement interval based on the predetermined angle. According to claim 2,
The light reflection unit, an organic light emitting display device provided to increase the brightness by being reflected back from the display panel after the light incident on the cover window is reflected. According to claim 3,
The light blocking unit and the light reflection unit are smaller in cross-sectional area toward the direction away from the display panel, and the cross-section in the height direction is a trapezoidal organic light emitting display device. The method of claim 5,
The trapezoidal hypotenuse has an inclination in consideration of blocking and transmitting the light. The method of claim 5,
The trapezoidal hypotenuse is an asymmetric organic light emitting display device. According to claim 2,
The light blocking portion is an organic light emitting display device that is a polymer containing a light absorbing material. According to claim 2,
The light reflector is a polymer that includes a material that reflects light, an organic light emitting display device. The method of claim 9,
The light reflection portion is an organic light emitting display device that is a polymer having a reflectivity of at least 95 percent. The method of claim 9,
The polymer is an organic light emitting display device comprising at least one or more of titanium oxide, zinc emulsion, light white and lithopone. According to claim 2,
The light transmitting portion is an organic light emitting display device that is a polymer having a transmittance of at least 80 percent. According to claim 2,
The cover window is an organic light emitting display device in which the wide angle control structure is disposed on one surface of a transparent base material made of glass or plastic. The method of claim 13,
An organic light emitting display device having a shielding layer covering an outer portion of a portion where the image is displayed on a surface on which the wide angle adjustment structure is disposed. A method for manufacturing a cover window of an organic light emitting display device,
Forming a shielding layer on one surface of the transparent substrate to cover the outer periphery of the portion where the image is displayed;
Applying a first transparent resin on one surface of the transparent substrate surrounded by the shielding layer;
Forming a groove to be filled with a wide-angle control pattern by pressing the first transparent resin into a molding mold;
Curing the first transparent resin in which the groove is formed;
Filling the groove with an opaque resin and curing;
Coating a second transparent resin on the top of the opaque resin;
Removing a portion of the second transparent resin that comes into contact with the opaque resin; And
Filling a resin containing a reflective material in a portion from which the second transparent resin is removed;
How to include. The method of claim 15,
The step of applying the first transparent resin,
Applying the first transparent resin to the top of the shielding layer. The method of claim 15,
The groove in which the wide-angle adjustment pattern is to be filled has a predetermined height and an arrangement interval, and the predetermined height and arrangement interval is determined based on an angle at which emission to the outside is blocked from light incident toward the cover window. The method of claim 15,
The resin containing the reflective material is a resin containing at least one or more of titanium oxide, zinc emulsion, light white and lithopone. The method of claim 15,
The resin containing the reflective material, the reflectance is 90% or more, the method.

Images