Method of manufacturing display device

Abstract

Disclosed is a method of manufacturing a display device, the method including: forming a display panel including pixels; a first substrate is formed on the display panel, and a polarization control layer is formed on the first substrate; the first alignment mark of a second substrate is aligned with the first alignment mark of the first substrate, and a lens layer is formed on the second substrate; forming a second substrate on the first substrate; aligning the first alignment mark of the third substrate with the first alignment mark of the second substrate; and forming a third substrate on the second substrate.

Description

[0001] This application claims the priority of Korean Patent Application No. 10-2023-0099671 filed on July 31, 2023 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] The present disclosure relates to a method of manufacturing a display device. More particularly, the present disclosure relates to a method of manufacturing a stereoscopic image display device that displays a three-dimensional (3D) image. Background Art

[0003] A stereoscopic image display device is designed to appeal to the visual senses of a viewer in a manner similar to a real object and to provide physical factors that enable the object to be perceived in three dimensions. For example, a stereoscopic image display device may provide different images to the left and right eyes of a viewer. This difference in images allows the viewer to experience a three-dimensional effect through binocular parallax between the left and right eyes.

[0004] Recently, research on glasses-free technology for viewing stereoscopic images has increased. Among these, the lens method uses a cylindrical lens array to separate the left eye image and the right eye image. Another method (barrier method) uses a barrier to separate the left eye image and the right eye image. Summary of the invention

[0005] The present disclosure provides a method of manufacturing a display device, which can form a polarization control layer and a lens layer on a display panel through three substrates.

[0006] An embodiment of the present disclosure provides a method for manufacturing a display device, the method comprising the following steps: forming a display panel including pixels; forming a first substrate on the display panel, wherein a polarization control layer is formed on the first substrate; aligning a first alignment mark of a second substrate with a first alignment mark of the first substrate, wherein a lens layer is formed on the second substrate; forming a second substrate on the first substrate; aligning a first alignment mark of a third substrate with a first alignment mark of the second substrate; and forming a third substrate on the second substrate.

[0007] A first alignment mark of the first substrate is formed on an upper portion of the first substrate.

[0008] A first alignment mark of the second substrate is formed on a lower portion of the second substrate.

[0009] A first alignment mark of the third substrate is formed on a lower portion of the third substrate.

[0010] The step of aligning the first alignment mark of the second substrate with the first alignment mark of the first substrate includes: photographing the first alignment mark of the first substrate and the first alignment mark of the second substrate with a camera; and aligning the first alignment mark of the second substrate with the first alignment mark of the first substrate by moving the second substrate based on the photographing.

[0011] The step of aligning the first alignment mark of the third substrate with the first alignment mark of the second substrate includes: photographing the first alignment mark of the second substrate with a camera set to a first focus; photographing the first alignment mark of the third substrate with a camera set to a second focus different from the first focus; and aligning the first alignment mark of the third substrate with the first alignment mark of the second substrate by moving the third substrate based on the photographing.

[0012] A first alignment mark of the first substrate, a first alignment mark of the second substrate, and a first alignment mark of the third substrate are formed in a scribe line region.

[0013] A first alignment mark of the first substrate, a first alignment mark of the second substrate, and a first alignment mark of the third substrate are formed in the active area.

[0014] A first alignment mark of the first substrate, a first alignment mark of the second substrate, and a first alignment mark of the third substrate are formed in the scribe line region and the active region.

[0015] The method further includes aligning a 2-1th alignment mark of the second substrate with a second alignment mark of the first substrate.

[0016] A tolerance for aligning the first alignment mark of the first substrate with the first alignment mark of the second substrate is greater than a tolerance for aligning the second alignment mark of the first substrate with the 2-1st alignment mark of the second substrate.

[0017] The method further includes aligning a second alignment mark of the third substrate with a 2-2 alignment mark of the second substrate, the 2-2 alignment mark of the second substrate being spaced apart from the 2-1 alignment mark of the second substrate.

[0018] A tolerance for aligning the first alignment mark of the second substrate with the first alignment mark of the third substrate is greater than a tolerance for aligning the 2-2 alignment mark of the second substrate with the second alignment mark of the third substrate.

[0019] An embodiment of the present disclosure provides a method for manufacturing a display device, the method comprising the following steps: forming a display panel including pixels; forming a first substrate on the display panel, wherein a polarization control layer is formed on the first substrate; aligning a 2-1 alignment mark of the second substrate with a second alignment mark of the first substrate, wherein a lens layer is formed on the second substrate; forming a second substrate on the first substrate; aligning the second alignment mark of the third substrate with the 2-2 alignment mark of the second substrate, the 2-2 alignment mark of the second substrate being spaced apart from the 2-1 alignment mark of the second substrate; and forming a third substrate on the second substrate.

[0020] The second alignment mark of the first substrate is formed on an upper portion of the first substrate, the 2-1st alignment mark and the 2-2nd alignment mark of the second substrate are formed on a lower portion of the second substrate, and the second alignment mark of the third substrate is formed on a lower portion of the third substrate.

[0021] The step of aligning the 2-1st alignment mark of the second substrate with the second alignment mark of the first substrate includes: photographing the second alignment mark of the first substrate and the 2-1st alignment mark of the second substrate with a camera; and aligning the 2-1st alignment mark of the second substrate with the second alignment mark of the first substrate by moving the second substrate based on the photographing.

[0022] The step of aligning the second alignment mark of the third substrate with the 2-2 alignment mark of the second substrate includes: photographing the 2-2 alignment mark of the second substrate with a camera set to a first focus; photographing the second alignment mark of the third substrate with a camera set to a second focus different from the first focus; and aligning the second alignment mark of the third substrate with the 2-2 alignment mark of the second substrate by moving the third substrate based on the photographing.

[0023] The second alignment mark of the first substrate, the 2-1 alignment mark of the second substrate, the 2-2 alignment mark of the second substrate, and the second alignment mark of the third substrate are formed in the scribe line region.

[0024] The second alignment mark of the first substrate, the 2-1 alignment mark of the second substrate, the 2-2 alignment mark of the second substrate, and the second alignment mark of the third substrate are formed in the active area.

[0025] The second alignment mark of the first substrate, the 2-1 alignment mark of the second substrate, the 2-2 alignment mark of the second substrate, and the second alignment mark of the third substrate are formed in the scribe line region and the active region.

[0026] The method of manufacturing a display device according to an embodiment of the present disclosure may perform an alignment process on the first substrate, the second substrate, and the third substrate by forming alignment marks for the first substrate, the second substrate, and the third substrate at the same position.

[0027] The method of manufacturing a display device according to an embodiment of the present disclosure may perform an alignment process on the first substrate, the second substrate, and the third substrate by forming alignment marks for the first substrate and the second substrate at the same position and forming alignment marks for the second substrate and the third substrate at the same position.

[0028] According to the method for manufacturing a display device of an embodiment of the present disclosure, a polarization control layer and a lens layer can be formed on a display panel through three substrates. Therefore, the method for manufacturing a display device omits an optical bonding process for attaching a substrate between a lens array and a polarization control layer, thereby simplifying the manufacturing process and reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A flowchart of a method for manufacturing a display device according to an embodiment of the present disclosure is shown.

[0030] Figure 2 A lens array type stereoscopic image display device is shown.

[0031] Figure 3 A stereoscopic image display device according to an embodiment of the present disclosure is schematically shown.

[0032] Figure 4 A cross-sectional view showing an example of a stereoscopic image display device.

[0033] Figure 5 Shown according to Figure 1 An example of a first alignment mark of a method of manufacturing a display device.

[0034] Figure 6 An example is shown in which a camera device photographs a first alignment mark of a first substrate and a first alignment mark of a second substrate.

[0035] Figure 7 An example is shown in which the camera device photographs the first alignment mark of the third substrate.

[0036] Figure 8 A first focus and a second focus of the camera device are shown.

[0037] Fig. 9 and Fig.10 Shows the Figure 5 An example of aligning a first alignment mark of a first substrate with a first alignment mark of a second substrate.

[0038] Fig.11 and Fig.12 Shows the Figure 5 An example of aligning the first alignment mark of the second substrate with the first alignment mark of the third substrate.

[0039] Fig.13 , Fig.14 and Fig.15 Shown according to Figure 1 An example of a position of an alignment mark of a method of manufacturing a display device.

[0040] Fig.16 A flowchart of a method for manufacturing a display device according to an embodiment of the present disclosure is shown.

[0041] Fig.17 Shown according to Fig.16 An example of a second alignment mark of a method of manufacturing a display device.

[0042] Fig.18 An example is shown in which the camera device photographs the second alignment mark of the first substrate and the 2-1st alignment mark of the second substrate.

[0043] Fig.19 An example is shown in which the camera device photographs the 2-2nd alignment mark of the second substrate.

[0044] Fig. 20 An example is shown in which the camera device photographs the second alignment mark of the third substrate.

[0045] Fig.21 and Fig. 22 Shows the Fig.17 An example of aligning the second alignment mark of the first substrate with the 2-1 alignment mark of the second substrate.

[0046] Fig.23 and Fig.24 Shows the Fig.17 An example of aligning the 2-2 alignment mark of the second substrate with the second alignment mark of the third substrate.

[0047] Fig.25 A flowchart of a method for manufacturing a display device according to an embodiment of the present disclosure is shown.

[0048] Fig.26 Shown according to Fig.25 An example of an alignment mark of a method of manufacturing a display device. DETAILED DESCRIPTION

[0049] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, it will be understood that the present disclosure can be embodied in different forms and is not limited to the embodiments set forth herein.

[0050] Throughout this specification, when describing an element "connected" to another element, this includes not only "direct connection", but also "indirect connection", and another device is between the element and the other element. The terms used here are for the purpose of describing a specific embodiment, and are not intended to limit the scope of disclosure. Throughout this specification, unless explicitly described to the contrary, the word "include" and its variations will be understood to imply the inclusion of stated elements, but do not exclude any other elements. For the purpose of this disclosure, "at least one (kind / person) of X, Y and Z" and "at least one (kind / person) selected from the group consisting of X, Y and Z" can be interpreted as any combination of only X, only Y, only Z or two or more of X, Y and Z, such as taking XYZ, XYY, YZ and ZZ as an example. As used herein, the term "and / or" includes any combination and all combinations of one or more of the relevant listed items.

[0051] Although the terms first, second, etc. can be used here to describe various constituent elements, these constituent elements should not be limited by these terms. These terms are used to distinguish one constituent element from another constituent element. Therefore, the first constituent element discussed below can be referred to as the second constituent element.

[0052] For descriptive purposes, spatially relative terms such as "under," "below," "lower," "above," "upper," etc. may be used herein to describe the relationship of one element or feature to another element or feature as shown in the accompanying drawings. In addition to the orientation depicted in the accompanying drawings, spatially relative terms are intended to cover different orientations of the device in use, operation, and / or manufacture. For example, if the device in the accompanying drawings is turned over, an element described as "under" or "beneath" other elements or features will subsequently be oriented to be "above" the other elements or features. Thus, the term "under" can cover both above and below orientations. In addition, the device can be oriented otherwise (e.g., rotated 90 degrees or in other orientations), and as such, the spatially relative descriptors used herein are interpreted accordingly.

[0053] Various embodiments are described herein with reference to cross-sectional illustrations that are schematic illustrations of idealized embodiments. As such, variations in the shapes of the illustrations due to, for example, manufacturing techniques and / or tolerances are to be expected. Therefore, the example embodiments disclosed herein should not be construed as limited to the shapes of the specific illustrated regions, but rather include deviations in shapes due to, for example, manufacturing. Therefore, the regions illustrated in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of regions of the device and are not intended to be limiting.

[0054] Figure 1 A flowchart of a method for manufacturing a display device according to an embodiment of the present disclosure is shown.

[0055] Reference Figure 1 , Figure 1 The method for manufacturing a display device in may include: forming a display panel including pixels (S100); forming a first substrate on which a polarization control layer for controlling polarization of light incident from the display panel is formed on the display panel (S200); aligning a first alignment mark of a second substrate on which a lens layer for refracting light incident from the display panel is formed with a first alignment mark of the first substrate (S310); forming a second substrate on the first substrate (S400); aligning a first alignment mark of a third substrate with a first alignment mark of the second substrate (S510); and forming a third substrate on the second substrate (S600). Figure 1 The method of manufacturing a display device shown in Figures 2 to 15 A method for manufacturing a stereoscopic image display device is described.

[0056] In the following, reference will be made to Figures 2 to 15 Detailed description.

[0057] Figure 2 A lens array type stereoscopic image display device is shown, and Figure 3 A stereoscopic image display device according to an embodiment of the present disclosure is schematically shown.

[0058] Reference Figure 2 and Figure 3 , the stereoscopic image display device 1000 may include a display panel DP and a lens array LSA.

[0059] The display panel DP may include pixels PX that emit light to display an image. In an embodiment, each of the pixels PX may output one of red light, green light, and blue light. However, this is an example, and the color of the light emitted from the pixel PX is not limited thereto, and light of various colors may be output for full color implementation.

[0060] In an embodiment, the display panel DP may be connected to a driving circuit that drives the pixel PX. The driving circuit may perform at least one of the functions of a gate driver, a data driver, and a driving controller. The driving circuit may also perform the function of an emission control driver. For example, the driving circuit may be disposed on the rear surface of the display panel DP.

[0061] In an embodiment, the pixels PX may be arranged on the front surface of the display panel DP to form a light emitting surface. An image may be displayed by the pixels PX. The pixels PX may construct a plurality of pixel rows and a plurality of pixel columns. Here, a pixel row may refer to a pixel group in which each pixel PX is connected to the same gate line, and a pixel column may refer to a pixel group in which each pixel PX is connected to the same data line. For example, the pixel rows may be arranged in the second direction DR2, and the pixel columns may be arranged in the first direction DR1.

[0062] In an embodiment, the display panel DP may include a pixel circuit layer and a display element layer disposed on a predetermined substrate to constitute a pixel PX. The display panel DP may further include an encapsulation structure encapsulating the display element layer. In addition, the display panel DP may further include a polarization layer on the encapsulation structure, the polarization layer including a phase retarder and / or a polarizer.

[0063] The pixel circuit layer may include a pixel circuit configured to drive a light emitting element of the pixel PX. For example, the pixel circuit layer may include a transistor and a signal line / power line connected to the transistor. The pixel circuit layer may have a stacked structure to form a transistor.

[0064] The display element layer may be disposed on the pixel circuit layer. The display element layer may include a light emitting element. The light emitting element may be electrically connected to the pixel circuit of the pixel circuit layer. In an embodiment, the light emitting element may be a self-luminous element. The self-luminous element may include an organic light emitting element, an inorganic light emitting element, or a light emitting element composed of a combination of an inorganic material and an organic material. For example, the display panel DP may be a self-luminous display panel. However, this is an example, and the light emitting element may include a light emitting element (e.g., a quantum dot display element) that emits light by changing the wavelength of light emitted using quantum dots.

[0065] In addition, the display panel DP may be implemented as a liquid crystal display panel, a plasma display panel, or a display panel that displays an image using quantum dots.

[0066] The lens array LSA may be disposed on the display panel DP and may include lenses LS that refract light incident from the pixels PX. For example, the lens array LSA may be implemented as a lenticular lens array, a micro lens array, or the like.

[0067] A light field display is a three-dimensional (3D) display that uses a flat display and optical elements (e.g., a lens array LSA) to achieve stereoscopic images by forming a light field represented as a vector distribution (e.g., intensity or direction) of light in space. A light field display is a display technology that can be used in various ways by combining with augmented reality (AR) technology because it allows viewing the depth and side surfaces of an object, thereby achieving a more natural stereoscopic image.

[0068] The light field can be implemented in various ways. For example, the light field can be formed by a method of generating a light field in various directions using multiple projectors, a method of controlling the direction of light using a diffraction grating, a method of controlling the direction and intensity (e.g., brightness) of light according to a combination of individual pixels using two or more panels, a method of controlling the direction of light using a pinhole or a barrier, and a method of controlling the direction of light refraction through a lens array.

[0069] In an embodiment, Figure 3 As shown in , the lens array type stereoscopic image display device 1000 can display a stereoscopic image (eg, a 3D image) by forming a light field.

[0070] A series of pixels PX may be assigned to each lens LS, and light emitted from each pixel PX may be refracted by the lens LS to travel only in a specific direction to form a light field represented by the intensity and direction of light. When a viewer views the stereoscopic image display device in the light field formed as described above, the viewer may feel a stereoscopic effect of the corresponding image.

[0071] Image information according to the viewpoint of the viewer in the light field may be processed in units of voxels. A voxel may be understood as graphic information defining a predetermined point (or pixel) of a 3D space.

[0072] In an embodiment, the lens array LSA may include semi-cylindrical lenses LS (eg, biconvex lenses) extending in one direction. Figure 3 As shown in , the lens LS may be arranged and extended obliquely with respect to the first direction DR1. In other words, the lens LS may be arranged obliquely. However, this is an example, and the extending direction (and arrangement direction) of the lens LS is not limited thereto.

[0073] The size and arrangement of the lens LS may be determined by conditions such as the size of the pixel area, the viewing distance, the pixel size, the resolution, and the pixel arrangement structure.

[0074] In an embodiment, the lens LS may include a microlens instead of a lenticular lens. When viewed in a plan view, the microlens may have a shape such as a hexagonal shape, a circular shape, or an elliptical shape.

[0075] Figure 4 A cross-sectional view showing an example of a stereoscopic image display device.

[0076] Reference Figures 2 to 4 , the stereoscopic image display device 1000 may include a display panel DP, a polarization control layer PCL, and a lens array LSA.

[0077] The polarization control layer PCL may be disposed between the lens array LSA and the display panel DP. For example, the polarization control layer PCL may be disposed between the lowermost portion of the lens array LSA and the uppermost portion of the display panel DP. The polarization control layer PCL may control polarization of light incident from the display panel DP.

[0078] The polarization control layer PCL may be formed on the first substrate SUB1. The polarization control layer PCL may include a lower electrode layer LE, a liquid crystal layer LCL, and an upper electrode layer UE.

[0079] The first substrate SUB1 may be disposed on the display panel DP. The first substrate SUB1 may be disposed on the display panel DP by optical bonding. In an embodiment, the first substrate SUB1 may be attached to the display panel DP by a transparent adhesive material AD. The transparent adhesive material AD may include an optically clear adhesive (OCA) or an optically clear resin (OCR).

[0080] The first substrate SUB1 may be made of a transparent insulating material. For example, the first substrate SUB1 may be an organic material selected from the group consisting of polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyarylate, polyimide, polycarbonate (PC), cellulose triacetate (SAC), and cellulose acetate propionate (CAP).

[0081] In an embodiment, the first substrate SUB1 may be an inorganic material. For example, the first substrate SUB1 may include a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer.

[0082] The lower electrode layer LE may be disposed on the first substrate SUB1. The lower electrode layer LE may include a transparent conductive material such as ITO. A reference voltage used as a reference for turning on / off the operation of the liquid crystal layer LCL may be supplied to the lower electrode layer LE.

[0083] In an embodiment, at least one of a lower alignment film and a lower insulating layer covering the lower electrode layer LE may be further disposed on the lower electrode layer LE.

[0084] The upper electrode layer UE may be arranged to face the lower electrode layer LE. In other words, the upper electrode layer UE may be positioned opposite to the lower electrode layer LE. The upper electrode layer UE may include a transparent conductive material such as ITO. A driving voltage for turning on / off the operation of the liquid crystal layer LCL may be supplied to the upper electrode layer UE. Depending on whether the driving voltage is applied, an electric field may be formed between the upper electrode layer UE and the lower electrode layer LE, and the orientation direction of the liquid crystal molecules LC included in the liquid crystal layer LCL may be controlled.

[0085] However, this is an example, and the driving voltage may be supplied to the lower electrode layer LE, and the reference voltage may be supplied to the upper electrode layer UE.

[0086] In an embodiment, at least one of an upper alignment layer and an upper insulating layer may also be disposed between the upper electrode layer UE and the liquid crystal layer LCL.

[0087] The liquid crystal layer LCL may be disposed between the lower electrode layer LE and the upper electrode layer UE. The liquid crystal layer LCL may include liquid crystal molecules LC whose alignment directions are controlled according to a voltage applied to the upper electrode layer UE.

[0088] In an embodiment, the liquid crystal layer LCL may be driven in a twisted nematic (TN) liquid crystal mode with a λ / 2 phase difference. However, this is an example, and the liquid crystal layer LCL may be driven in a liquid crystal mode such as vertical alignment (VA), optically compensatory bend (OCB), or electrically controlled birefringence (ECB).

[0089] For example, in a state where an electric field is not applied to the liquid crystal molecules LC in the TN liquid crystal mode, the liquid crystal molecules LC are arranged (e.g., oriented) to rotate the linear polarized light in the vertical direction of the incident light by 90° to change the linear polarized light in the vertical direction into the linear polarized light in the horizontal direction. Therefore, the liquid crystal layer LCL can linearly polarize the light incident from the display panel DP in the horizontal direction to transmit it. The linearly polarized light in the horizontal direction is provided to the lens array LSA, and an image can be displayed in a two-dimensional (2D) image mode.

[0090] On the other hand, in a stereoscopic image mode (or 3D image mode), a driving voltage is applied to the upper electrode layer UE, and an electric field may be formed between the upper electrode layer UE and the lower electrode layer LE. The liquid crystal molecules LC may be arranged (e.g., oriented) to transmit the incident light through the formed electric field. For example, light having a polarization axis in a vertical direction incident from the display panel DP may be directly incident on the lens array LSA. The light refracted from the lens array LSA may be divided into an optical path corresponding to the right eye image and an optical path corresponding to the left eye image, and may converge to different focal points to achieve a stereoscopic image.

[0091] The lens array LSA may be formed on the second substrate SUB2. For example, the second substrate SUB2 may be used as a substrate (e.g., a mother substrate) for forming / manufacturing the lens array LSA. In an embodiment, the second substrate SUB2 may be made of a transparent insulating material. The second substrate SUB2 may include a transparent organic material or a transparent inorganic material that may constitute the above-mentioned first substrate SUB1. For example, the second substrate SUB2 may have the same material as the first substrate SUB1.

[0092] The lens array LSA may shape the light field by refracting the light provided from the polarization control layer PCL. The lens array LSA may include a lens layer LSL and a planarization layer PLL. The planarization layer PLL may be stacked with the lens layer LSL. The lens array LSA may be directly disposed on the polarization control layer PCL without an intermediate medium.

[0093] In an embodiment, the lens layer LSL may be directly disposed on the upper electrode layer UE. For example, the material constituting the upper electrode layer UE may be directly deposited on the lower surface of the lens layer LSL.

[0094] In an embodiment, the lens layer LSL may include an array of lenses LS having a semi-cylindrical convex shape. For example, the lens LS may be a double convex lens. However, this is an example, and the lens LS may be formed as a micro lens having each area having a micro size.

[0095] The lens layer LSL may include an optically anisotropic material. For example, the interior of the lens layer LSL may be made of reactive mesogens. In other words, the lens layer LSL has a mesogen structure, so the lens layer LSL may form a liquid crystal phase.

[0096] The material filling the lens layer LSL may be cured by reacting with light such as ultraviolet light to form a liquid crystal phase. Therefore, the interior of the lens layer LSL may have an optically anisotropic fixed phase. For example, the lens layer LSL may have different long-axis refractive indices and short-axis refractive indices.

[0097] The planarization layer PLL may cover the lens layer LSL. The planarization layer PLL may be in direct contact with the lens layer LSL. The planarization layer PLL has a substantially flat upper surface and may be made of an optically isotropic polymer.

[0098] For example, the planarization layer PLL may include an optically isotropic material having a refractive index substantially equal to a major-axis refractive index or a minor-axis refractive index of the lens layer LSL.

[0099] When light incident from the polarization control layer PCL vibrates along the axial direction with a refractive index different from that of the planarization layer PLL, the light can be refracted and emitted at the interface between the lens layer LSL and the planarization layer PLL based on the refractive index difference between them. In this case, a stereoscopic image can be displayed by the refraction of the emitted light.

[0100] When light incident from the polarization control layer PCL vibrates along the axis direction with the same refractive index as those of the lens layer LSL and the planarization layer PLL, the incident light may be emitted as is (eg, without change) in the vibration direction of the incident light.

[0101] In this manner, a 3D image may be realized by providing a relationship between the vibration direction of incident light to the lens array LSA and the refractive indices of the lens layer LSL and the planarization layer PLL.

[0102] In an embodiment, the third substrate SUB3 may be disposed on the planarization layer PLL. For example, the third substrate SUB3 may protect the lens array LSA disposed thereunder from external contamination, impact, and scratching.

[0103] In an embodiment, the third substrate SUB3 may be made of a transparent insulating material. The third substrate SUB3 may include a transparent organic material or a transparent inorganic material that may constitute the above-mentioned first substrate SUB1. For example, the third substrate SUB3 may have the same material as the first substrate SUB1.

[0104] In an embodiment, the lens array LSA including the lens layer LSL having the photo-curable reactive mesogen and the planarization layer PLL and the third substrate SUB3 may be provided in the form of a film.

[0105] In contrast, when a fluid liquid crystal polymer is used to construct the lens layer LSL, the liquid crystal polymer flows outside the lens LS, and to prevent this, an additional substrate (or additional base layer) is placed between the lens layer LSL and the upper electrode layer UE. The fluid liquid crystal polymer of the lens layer LSL can be oriented according to the electric field formed in the lens layer LSL. Such a lens array can be understood as a liquid crystal lens array. The liquid crystal lens array may have reliability issues such as crystallization of liquid crystal under low temperature conditions.

[0106] In addition, in the stereoscopic image display device having the liquid crystal lens array, the thickness of the lens array LSA increases due to the additional substrate, and thus the focal length, which is the distance from the pixel PX to the lens LS, increases.

[0107] The focal length is a major factor in determining optical properties such as the viewing angle of a stereoscopic image. For example, as the focal length decreases, the viewing angle increases, which can improve the image quality of the stereoscopic image. Specifically, the viewing angle can be increased by reducing the focal length according to the reduction in the thickness of the lens array LSA.

[0108] In an embodiment, the polarization control layer PCL may be formed on the first substrate SUB1, the second substrate SUB2 may be formed on the polarization control layer PCL, the lens array LSA may be formed on the second substrate SUB2, and the third substrate SUB3 may be formed on the lens array LSA. For example, the first substrate SUB1, the polarization control layer PCL, the second substrate SUB2, the lens array LSA, and the third substrate SUB3 may be arranged in sequence. In an embodiment, the second substrate SUB2 having the lens array LSA formed thereon may be formed on the polarization control layer PCL.

[0109] Compared with the case where a polarization control layer PCL is formed between two substrates, a lens array LSA is formed between the two substrates, and then the substrates are bonded, the method for manufacturing a display device according to an embodiment of the present invention can reduce the number of optical bonding and scribing cuts. In other words, the method for manufacturing a display device omits the optical bonding process of attaching the substrate between the lens array LSA and the polarization control layer PCL, thereby simplifying the manufacturing process and reducing the manufacturing cost.

[0110] Figure 5 Shown according to Figure 1 An example of a first alignment mark of a method of manufacturing a display device, Figure 6 An example in which a camera device photographs a first alignment mark of a first substrate and a first alignment mark of a second substrate is shown, Figure 7 An example is shown in which a camera device photographs a first alignment mark of a third substrate, and Figure 8 A first focus and a second focus of the camera device are shown.

[0111] For ease of understanding and description, Figures 5 to 7 The alignment marks SUB1_A1, SUB2_A1 and SUB3_A1 of each substrate are shown to overlap, but as Figures 9 to 12 As shown in FIG. 8 , the alignment marks SUB1_A1 , SUB2_A1 , and SUB3_A1 may not overlap.

[0112] Reference Figure 5 , before forming the substrate, the substrate must be set in the correct position. Therefore, alignment marks can be formed on each substrate to ensure that the substrate is set in the correct position. The producer can check whether each substrate is set in the correct position by checking whether the alignment marks of each substrate are aligned with the alignment marks of another substrate. A detailed description of this will be described later.

[0113] The first alignment mark SUB1_A1 of the first substrate SUB1, the first alignment mark SUB2_A1 of the second substrate SUB2, and the first alignment mark SUB3_A1 of the third substrate SUB3 may be formed at the same position. For example, the first alignment mark SUB3_A1 of the third substrate SUB3 may be aligned with the first alignment mark SUB2_A1 of the second substrate SUB2, and the first alignment mark SUB2_A1 of the second substrate SUB2 may be aligned with the first alignment mark SUB1_A1 of the first substrate SUB1. For example, the first alignment mark SUB1_A1 of the first substrate SUB1, the first alignment mark SUB2_A1 of the second substrate SUB2, and the first alignment mark SUB3_A1 of the third substrate SUB3 may overlap each other in the vertical direction.

[0114] The first alignment mark SUB1_A1 of the first substrate SUB1 may be formed on the upper portion of the first substrate SUB1. The first alignment mark SUB2_A1 of the second substrate SUB2 may be formed on the lower portion of the second substrate SUB2. This configuration allows the first alignment mark SUB1_A1 of the first substrate SUB1 to be adjacent to the first alignment mark SUB2_A1 of the second substrate SUB2. The first alignment mark SUB3_A1 of the third substrate SUB3 may be formed on the lower portion of the third substrate SUB3.

[0115] In this manner, the method of manufacturing the display device may form the second substrate SUB2 at a more accurate position by forming the first alignment mark SUB1_A1 of the first substrate SUB1 and the first alignment mark SUB2_A1 of the second substrate SUB2 as closely as possible.

[0116] However, the present disclosure is not limited thereto. For example, the first alignment mark SUB1_A1 of the first substrate SUB1 may be formed on the lower portion of the first substrate SUB1. For example, the first alignment mark SUB2_A1 of the second substrate SUB2 may be formed on the upper portion of the second substrate SUB2. For example, the first alignment mark SUB3_1 of the third substrate SUB3 may be formed on the upper portion of the third substrate SUB3.

[0117] Reference Figures 6 to 8 , the method of manufacturing the display device may check whether the first alignment marks SUB1_A1, SUB2_A1, and SUB3_A1 are aligned through the camera device 2000. A detailed description of whether the alignment is performed will be described later.

[0118] In the manufacturing method of the display device, the first alignment mark SUB1_A1 of the first substrate SUB1 and the first alignment mark SUB2_A1 of the second substrate SUB2 may be photographed with the camera device 2000, and the second substrate SUB2 may be moved so that the first alignment mark SUB2_A1 of the second substrate SUB2 is aligned with the first alignment mark SUB1_A1 of the first substrate SUB1. In the manufacturing method of the display device, the first alignment mark SUB2_A1 of the second substrate SUB2 and the first alignment mark SUB3_A1 of the third substrate SUB3 may be photographed with the camera device 2000, and the third substrate SUB3 may be moved so that the first alignment mark SUB3_A1 of the third substrate SUB3 is aligned with the first alignment mark SUB2_A1 of the second substrate SUB2.

[0119] For example, the first alignment mark SUB1_A1 of the first substrate SUB1 and the first alignment mark SUB2_A1 of the second substrate SUB2 may be photographed by using the camera device 2000 set to the first focus F1. Figure 6 For example, the first alignment mark SUB3_A1 of the third substrate SUB3 may be photographed by using the camera device 2000 set to a second focus F2 different from the first focus F1, as shown in FIG. Figure 7 as shown in .

[0120] The camera device 2000 may include a camera lens CL and a camera sensor CS. The camera lens CL may refract light incident on the camera device 2000 to provide the incident light to the camera sensor CS. The camera sensor CS may receive the incident light to provide an image to a user.

[0121] like Figure 8 As shown in , the depth of field DOF of the camera device 2000 may include a first focus F1 and a second focus F2. For example, the depth of field DOF may be a range in which the image quality desired by the user is maintained when the position of the object moves closer or farther.

[0122] Fig. 9 and Fig.10 Shows the Figure 5 An example in which a first alignment mark of the first substrate is aligned with a first alignment mark of the second substrate, and Fig.11 and Fig.12 Shows the Figure 5 An example of aligning the first alignment mark of the second substrate with the first alignment mark of the third substrate.

[0123] Reference Figures 9 to 12 , the alignment of the alignment marks can be determined in a preset manner.

[0124] In embodiments, according to a method of manufacturing a display device, the first alignment mark SUB1_A1 of the first substrate SUB1 may be included in the first alignment mark SUB2_A1 of the second substrate SUB2 so that the first alignment mark SUB2_A1 of the second substrate SUB2 may be aligned with the first alignment mark SUB1_A1 of the first substrate SUB1.

[0125] For example, Fig. 9 As shown in FIG. 1 , the first alignment mark SUB1_A1 of the first substrate SUB1 and the first alignment mark SUB2_A1 of the second substrate SUB2 may have a quadrilateral shape. Fig. 9 In the configuration of , the first alignment mark SUB1_A1 of the first substrate SUB1 may be surrounded by the first alignment mark SUB2_A1 of the second substrate SUB2. Fig.10 As shown in FIG. 1 , the first alignment mark SUB1_A1 of the first substrate SUB1 and the first alignment mark SUB2_A1 of the second substrate SUB2 may have a cross shape. Fig.10 In the configuration of FIG. 1 , the first alignment mark SUB1_A1 of the first substrate SUB1 may be surrounded by the first alignment mark SUB2_A1 of the second substrate SUB2 .

[0126] when Fig.10 The maximum width (eg, the second width W2) that can be formed when the first alignment mark SUB1_A1 of the first substrate SUB1 is aligned with the first alignment mark SUB2_A1 of the second substrate SUB2 may be smaller than when Fig. 9The maximum width (eg, first width W1) that can be formed when the first alignment mark SUB1_A1 of the first substrate SUB1 is aligned with the first alignment mark SUB2_A1 of the second substrate SUB2. Fig.10 Compared with the alignment of Fig. 9 In other words, it is easier to align Fig. 9 Therefore, according to Fig. 9 The tolerance of aligning the first alignment mark SUB1_A1 of the first substrate SUB1 with the first alignment mark SUB2_A1 of the second substrate SUB2 may be greater than Fig.10 The tolerance of aligning the first alignment mark SUB1_A1 of the first substrate SUB1 with the first alignment mark SUB2_A1 of the second substrate SUB2 is Fig. 9 The alignment marks are compared according to Fig.10 The alignment mark may be more suitable for fine adjustment. Here, the tolerance may be the allowable error of the position of the substrate set by the designer.

[0127] In an embodiment, according to a method of manufacturing a display device, the first alignment mark SUB2_A1 of the second substrate SUB2 may be included in the first alignment mark SUB3_A1 of the third substrate SUB3 so that the first alignment mark SUB3_A1 of the third substrate SUB3 may be aligned with the first alignment mark SUB2_A1 of the second substrate SUB2.

[0128] For example, Fig.11 As shown in , the first alignment mark SUB2_A1 of the second substrate SUB2 and the first alignment mark SUB3_A1 of the third substrate SUB3 may have a quadrilateral shape. Fig.11 In the configuration of , the first alignment mark SUB2_A1 of the second substrate SUB2 may be surrounded by the first alignment mark SUB3_A1 of the third substrate SUB3. Fig.12 As shown in FIG. 1 , the first alignment mark SUB2_A1 of the second substrate SUB2 and the first alignment mark SUB3_A1 of the third substrate SUB3 may have a cross shape. Fig.12 In the configuration of FIG. 1 , the first alignment mark SUB2_A1 of the second substrate SUB2 may be surrounded by the first alignment mark SUB3_A1 of the third substrate SUB3 .

[0129] when Fig.12 The maximum width (eg, the fourth width W4) that can be formed when the first alignment mark SUB2_A1 of the second substrate SUB2 is aligned with the first alignment mark SUB3_A1 of the third substrate SUB3 may be smaller than when Fig.11The maximum width (eg, third width W3) that can be formed when the first alignment mark SUB2_A1 of the second substrate SUB2 is aligned with the first alignment mark SUB3_A1 of the third substrate SUB3. Fig.12 Compared with the alignment of Fig.11 In other words, it is easier to align Fig.11 Therefore, according to Fig.11 The tolerance of aligning the first alignment mark SUB2_A1 of the second substrate SUB2 with the first alignment mark SUB3_A1 of the third substrate SUB3 may be greater than Fig.12 The tolerance of aligning the first alignment mark SUB2_A1 of the second substrate SUB2 with the first alignment mark SUB3_A1 of the third substrate SUB3 is Fig.11 The alignment marks are compared according to Fig.12 The alignment marks may be more suitable for fine tuning.

[0130] However, the present disclosure is not limited to the shape of the alignment mark and the alignment method.

[0131] Figures 13 to 15 Shown according to Figure 1 An example of a position of an alignment mark of a method of manufacturing a display device.

[0132] Reference Figure 5 and Fig.13 In an embodiment, an alignment area ALA in which the first alignment mark SUB1_A1 of the first substrate SUB1, the first alignment mark SUB2_A1 of the second substrate SUB2, and the first alignment mark SUB3_A1 of the third substrate SUB3 are formed may be included in the scribe area SLA.

[0133] Reference Figure 5 and Fig.14 In an embodiment, an alignment area ALA in which the first alignment mark SUB1_A1 of the first substrate SUB1, the first alignment mark SUB2_A1 of the second substrate SUB2, and the first alignment mark SUB3_A1 of the third substrate SUB3 are formed may be included in the active area AA.

[0134] Reference Figure 5 and Fig.15In an embodiment, an alignment area ALA1 in which a first alignment mark SUB1_A1 of the first substrate SUB1, a first alignment mark SUB2_A1 of the second substrate SUB2, and a first alignment mark SUB3_A1 of the third substrate SUB3 are formed may be included in the scribe area SLA, and an alignment area ALA2 in which a first alignment mark SUB1_A1 of the first substrate SUB1, a first alignment mark SUB2_A1 of the second substrate SUB2, and a first alignment mark SUB3_A1 of the third substrate SUB3 are formed may be included in the active area AA.

[0135] Here, the scribing area SLA is an area outside the scribing line and is an area removed during the manufacturing process. For example, the display device may include only an active area AA in which the scribing area SLA is removed from the first substrate SUB1, the second substrate SUB2, and the third substrate SUB3. For example, after forming the first substrate SUB1, the second substrate SUB2, and the third substrate SUB3, the scribing area SLA of each of the first substrate SUB1, the second substrate SUB2, and the third substrate SUB3 may be removed.

[0136] Fig.16 A flowchart of a method for manufacturing a display device according to an embodiment of the present disclosure is shown.

[0137] Since the method for manufacturing a display device according to the present embodiment is different from the method for manufacturing a display device according to the present embodiment except for the alignment mark, Figure 1 The method of manufacturing a display device is substantially the same, and thus the same reference numerals and reference numerals are used for the same or similar constituent elements, and redundant descriptions are omitted.

[0138] Reference Fig.16 , Fig.16 The method for manufacturing a display device may include: forming a display panel including pixels (S100); forming a first substrate on which a polarization control layer for controlling polarization of light incident from the display panel is formed on the display panel (S200); aligning a 2-1 alignment mark of a second substrate on which a lens layer for refracting light incident from the display panel is formed with a second alignment mark of the first substrate (S320); forming a second substrate on the first substrate (S400); aligning the second alignment mark of the third substrate with the 2-2 alignment mark of the second substrate (S520); and forming a third substrate on the second substrate (S600).

[0139] In the following, reference will be made to Figures 17 to 24 Detailed Description Fig.16 method.

[0140] Fig.17 Shown according to Fig.16 An example of a second alignment mark of a method of manufacturing a display device, Fig.18 An example in which a camera device photographs a second alignment mark of a first substrate and a 2-1st alignment mark of a second substrate is shown, Fig.19 An example in which a camera device photographs a 2-2 alignment mark of a second substrate is shown, and Fig. 20 An example is shown in which the camera device photographs the second alignment mark of the third substrate.

[0141] For ease of understanding and description, Figures 17 to 20 A case is shown in which the second alignment mark SUB1_A2 of the first substrate SUB1 overlaps the 2-1 alignment mark SUB2_A2-1 of the second substrate and the 2-2 alignment mark SUB2_A2-2 of the second substrate SUB2 overlaps the second alignment mark SUB3_A2 of the third substrate SUB3. The 2-1 alignment mark SUB2_A2-1 and the 2-2 alignment mark SUB2_A2-2 are collectively referred to as the second alignment mark of the second substrate SUB2. However, it will be understood that in other embodiments, some or all of these alignment marks may not overlap.

[0142] Reference Fig.17 , the second alignment mark SUB1_A2 of the first substrate SUB1 and the 2-1 alignment mark SUB2_A2-1 of the second substrate SUB2 may be formed at the same position. Specifically, the second alignment mark SUB1_A2 of the first substrate SUB1 and the 2-1 alignment mark SUB2_A2-1 of the second substrate SUB2 may be adjacent to each other. The second alignment mark SUB2_A2-2 of the second substrate SUB2 and the second alignment mark SUB3_A2 of the third substrate SUB3 may be formed at the same position. For example, the 2-1 alignment mark SUB2_A2-1 of the second substrate SUB2 may be used to align the second alignment mark SUB1_A2 of the first substrate SUB1, and the 2-2 alignment mark SUB2_A2-2 of the second substrate SUB2 may be used to align the second alignment mark SUB3_A2 of the third substrate SUB3.

[0143] The second alignment mark SUB1_A2 of the first substrate SUB1 may be formed on the upper portion of the first substrate SUB1. The 2-1st alignment mark SUB2_A2-1 and the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 may be formed on the lower portion of the second substrate SUB2. The second alignment mark SUB3_A2 of the third substrate SUB3 may be formed on the lower portion of the third substrate SUB3. For example, the 2-1st alignment mark SUB2_A2-1 and the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 may be formed by the same photoresist process.

[0144] As described above, the method of manufacturing the display device may form the second substrate SUB2 at a more accurate position by forming the second alignment mark SUB1_A2 of the first substrate SUB1 and the 2-1st alignment mark SUB2_A2-1 of the second substrate SUB2 as close as possible.

[0145] However, the present disclosure is not limited thereto. For example, the second alignment mark SUB1_A2 of the first substrate SUB1 may be formed on the lower portion of the first substrate SUB1. For example, the 2-1st alignment mark SUB2_A2-1 and the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 may be formed on the upper portion of the second substrate SUB2. For example, the 2-1st alignment mark SUB2_A2-1 of the second substrate SUB2 may be formed on the lower portion of the second substrate SUB2, and the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 may be formed on the upper portion of the second substrate SUB2. For example, the second alignment mark SUB3_A2 of the third substrate SUB3 may be formed on the upper portion of the third substrate SUB3.

[0146] Reference Figures 18 to 20 , the method of manufacturing the display device may check whether the second alignment marks SUB1_A2 , SUB2_A2 - 1 , SUB2_A2 - 2 , and SUB3_A2 are aligned through the camera device 2000 .

[0147] In the manufacturing method of the display device, the second alignment mark SUB1_A2 of the first substrate SUB1 and the 2-1 alignment mark SUB2_A2-1 of the second substrate SUB2 may be photographed by the camera device 2000, and the second substrate SUB2 may be moved so that the 2-1 alignment mark SUB2_A2-1 of the second substrate SUB2 is aligned with the second alignment mark SUB1_A2 of the first substrate SUB1, as shown in FIG. Fig.18 In the manufacturing method of the display device, the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 and the second alignment mark SUB3_A2 of the third substrate SUB3 may be photographed by the camera device 2000, and the third substrate SUB3 may be moved so that the second alignment mark SUB3_A2 of the third substrate SUB3 is aligned with the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2, as shown in FIG. Fig.19 and Fig. 20 as shown in .

[0148] For example, the second alignment mark SUB1_A2 of the first substrate SUB1, the 2-1 alignment mark SUB2_A2-1 of the second substrate SUB2, and the 2-2 alignment mark SUB2_A2-2 of the second substrate SUB2 may be photographed using the camera device 2000 set to the first focus F1. For example, the second alignment mark SUB3_A2 of the third substrate SUB3 may be photographed using the camera device 2000 set to the second focus F2 different from the first focus F1.

[0149] Fig.21 and Fig. 22 Shows the Fig.17 An example in which the second alignment mark of the first substrate is aligned with the 2-1 alignment mark of the second substrate, and Fig.23 and Fig.24 Shows the Fig.17 An example of aligning the 2-2 alignment mark of the second substrate with the second alignment mark of the third substrate.

[0150] Reference Figure 21 to Figure 24 , the alignment of the alignment marks can be determined in a preset manner.

[0151] In an embodiment, according to a method of manufacturing a display device, the second alignment mark SUB1_A2 of the first substrate SUB1 may be included in the 2-1st alignment mark SUB2_A2-1 of the second substrate SUB2 so that the 2-1st alignment mark SUB2_A2-1 of the second substrate SUB2 may be aligned with the second alignment mark SUB1_A2 of the first substrate SUB1.

[0152] For example, Fig.21 As shown in FIG. 1 , the second alignment mark SUB1_A2 of the first substrate SUB1 and the 2-1st alignment mark SUB2_A2-1 of the second substrate SUB2 may have a quadrilateral shape. Fig.21 In the embodiment, the second alignment mark SUB1_A2 of the first substrate SUB1 may be surrounded by the 2-1 alignment mark SUB2_A2-1 of the second substrate SUB2. Fig. 22 As shown in FIG. 1 , the second alignment mark SUB1_A2 of the first substrate SUB1 and the 2-1st alignment mark SUB2_A2-1 of the second substrate SUB2 may have a cross shape. Fig. 22 , the second alignment mark SUB1_A2 of the first substrate SUB1 may be surrounded by the 2-1th alignment mark SUB2_A2-1 of the second substrate SUB2.

[0153] when Fig. 22The maximum width (eg, the sixth width W6) that can be formed when the second alignment mark SUB1_A2 of the first substrate SUB1 is aligned with the 2-1st alignment mark SUB2_A2-1 of the second substrate SUB2 may be smaller than the maximum width W6 when the second alignment mark SUB1_A2 of the first substrate SUB1 is aligned with the 2-1st alignment mark SUB2_A2-1 of the second substrate SUB2 Fig.21 The maximum width (eg, the fifth width W5) that can be formed when the second alignment mark SUB1_A2 of the first substrate SUB1 is aligned with the 2-1 alignment mark SUB2_A2-1 of the second substrate SUB2. Fig. 22 Compared with the alignment of Fig.21 The alignment can have a larger alignment margin. Fig.21 The tolerance of aligning the second alignment mark SUB1_A2 of the first substrate SUB1 with the 2-1st alignment mark SUB2_A2-1 of the second substrate SUB2 may be greater than the tolerance of aligning the second alignment mark SUB1_A2 of the first substrate SUB1 with the 2-1st alignment mark SUB2_A2-1 of the second substrate SUB2. Fig. 22 The tolerance of aligning the second alignment mark SUB1_A2 of the first substrate SUB1 with the 2-1 alignment mark SUB2_A2-1 of the second substrate SUB2 is Fig.21 Compared with the alignment of Fig. 22 The alignment may be more suitable for fine tuning.

[0154] In an embodiment, according to a method of manufacturing a display device, the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 may be included in the second alignment mark SUB3_A2 of the third substrate SUB3 so that the second alignment mark SUB3_A2 of the third substrate SUB3 may be aligned with the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2.

[0155] For example, Fig.23 As shown in , the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 and the second alignment mark SUB3_A2 of the third substrate SUB3 may have a quadrilateral shape. Fig.23 In the embodiment, the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 may be surrounded by the second alignment mark SUB3_A2 of the third substrate SUB3. Fig.24 As shown in FIG. 1 , the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 and the second alignment mark SUB3_A2 of the third substrate SUB3 may have a cross shape. Fig.24 , the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 may be surrounded by the second alignment mark SUB3_A2 of the third substrate SUB3.

[0156] when Fig.24The maximum width (eg, the eighth width W8) that can be formed when the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 is aligned with the second alignment mark SUB3_A2 of the third substrate SUB3 may be smaller than the width W8 of the Fig.23 The maximum width (eg, the seventh width W7) that can be formed when the 2-2 alignment mark SUB2_A2-2 of the second substrate SUB2 is aligned with the second alignment mark SUB3_A2 of the third substrate SUB3. Fig.24 Compared with the alignment of Fig.23 The alignment can have a larger alignment margin. Fig.23 The tolerance of aligning the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 with the second alignment mark SUB3_A2 of the third substrate SUB3 may be greater than the tolerance of aligning the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 with the second alignment mark SUB3_A2 of the third substrate SUB3. Fig.24 The tolerance of aligning the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 with the second alignment mark SUB3_A2 of the third substrate SUB3 is Fig.23 Compared with the alignment of Fig.24 The alignment may be more suitable for fine tuning.

[0157] However, the present disclosure is not limited to the shape of the alignment mark and the alignment method.

[0158] Fig.25 A flowchart of a method for manufacturing a display device according to an embodiment of the present disclosure is shown, and Fig.26 Shown according to Fig.25 An example of an alignment mark of a method of manufacturing a display device.

[0159] Since in addition to including Figure 5 The first alignment mark and Fig.17 In addition to the second alignment mark in the embodiment, the method for manufacturing a display device according to the present embodiment is Figure 1 The method of manufacturing a display device is substantially the same, and thus the same reference numerals and reference numerals are used for the same or similar constituent elements, and redundant descriptions are omitted.

[0160] Reference Fig.25 , Fig.25The method for manufacturing a display device in may include: forming a display panel including pixels (S100); forming a first substrate on which a polarization control layer for controlling polarization of light incident from the display panel is formed on the display panel (S200); aligning a first alignment mark of a second substrate on which a lens layer for refracting light incident from the display panel is formed with a first alignment mark of the first substrate (S310); aligning a 2-1 alignment mark of the second substrate on which a lens layer for refracting light incident from the display panel is formed with a second alignment mark of the first substrate (S320); forming a second substrate on the first substrate (S400); aligning a first alignment mark of a third substrate with a first alignment mark of the second substrate (S510); aligning a second alignment mark of the third substrate with a 2-2 alignment mark of the second substrate (S520); and forming a third substrate on the second substrate (S600).

[0161] Reference Fig.26 , the tolerance of aligning the first alignment mark SUB1_A1 of the first substrate SUB1 with the first alignment mark SUB2_A1 of the second substrate SUB2 may be greater than the tolerance of aligning the second alignment mark SUB1_A2 of the first substrate SUB1 with the 2-1 alignment mark SUB2_A2-1 of the second substrate SUB2. Fig. 9 and Fig. 22 As shown in FIG, the first alignment mark SUB1_A1 of the first substrate SUB1 and the first alignment mark SUB2_A1 of the second substrate SUB2 may have a quadrangular shape, and the second alignment mark SUB1_A2 of the first substrate SUB1 and the 2-1st alignment mark SUB2_A2-1 of the second substrate SUB2 may have a cross shape.

[0162] The tolerance of aligning the first alignment mark SUB2_A1 of the second substrate SUB2 with the first alignment mark SUB3_A1 of the third substrate SUB3 may be greater than the tolerance of aligning the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 with the second alignment mark SUB3_A2 of the third substrate SUB3. Fig.11 and Fig.24 As shown in FIG. 1 , the first alignment mark SUB2_A1 of the second substrate SUB2 and the first alignment mark SUB3_A1 of the third substrate SUB3 may have a quadrangular shape, and the 2-2nd alignment mark SUB2_A2-2 of the second substrate SUB2 and the second alignment mark SUB3_A2 of the third substrate SUB3 may have a cross shape.

[0163] according to Fig.25In the method of manufacturing a display device, after roughly moving the first substrate SUB1, the second substrate SUB2 and the third substrate SUB3 using the first alignment marks SUB1_A1, SUB2_A1 and SUB3_A1, the positions of the first substrate SUB1, the second substrate SUB2 and the third substrate SUB3 can be finely adjusted using the second alignment marks SUB1_A2, SUB2_A2-1, SUB2_A2-2 and SUB3_A2.

[0164] The present disclosure can be applied to display devices and electronic devices including display devices. For example, the present disclosure can be applied to digital TVs, 3D TVs, mobile phones, smart phones, tablet computers, virtual reality (VR) devices, personal computers (PCs), home electronic devices, laptop computers, personal digital assistants (PDAs), portable multimedia players (PMPs), digital cameras, music players, portable game consoles, navigation devices, etc.

[0165] While the disclosure has been described in connection with what are presently considered to be practical embodiments, it is to be understood that the disclosure 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 appended claims.

Claims

1. A method for manufacturing a display device, the method comprising the following steps: forming a display panel including pixels; forming a first substrate on the display panel, wherein a polarization control layer is formed on the first substrate; aligning a first alignment mark of a second substrate with a first alignment mark of the first substrate, wherein a lens layer is formed on the second substrate; forming the second substrate on the first substrate; aligning a first alignment mark of a third substrate with the first alignment mark of the second substrate; and The third substrate is formed on the second substrate.

2. The method for manufacturing a display device according to claim 1, wherein: The first alignment mark of the first substrate is formed on an upper portion of the first substrate.

3. The method for manufacturing a display device according to claim 1, wherein: The first alignment mark of the second substrate is formed on a lower portion of the second substrate.

4. The method for manufacturing a display device according to claim 1, wherein: The first alignment mark of the third substrate is formed on a lower portion of the third substrate.

5. The method for manufacturing a display device according to claim 1, wherein: The step of aligning the first alignment mark of the second substrate with the first alignment mark of the first substrate comprises: photographing the first alignment mark of the first substrate and the first alignment mark of the second substrate with a camera; and The first alignment mark of the second substrate is aligned with the first alignment mark of the first substrate by moving the second substrate based on the photographing.

6. The method for manufacturing a display device according to claim 1, wherein: The step of aligning the first alignment mark of the third substrate with the first alignment mark of the second substrate comprises: photographing the first alignment mark of the second substrate with a camera set to a first focus; photographing the first alignment mark of the third substrate with the camera set to a second focus different from the first focus; and The first alignment mark of the third substrate is aligned with the first alignment mark of the second substrate by moving the third substrate based on the photographing.

7. The method for manufacturing a display device according to claim 1, wherein: The first alignment mark of the first substrate, the first alignment mark of the second substrate, and the first alignment mark of the third substrate are formed in a scribe line region.

8. The method for manufacturing a display device according to claim 1, wherein: The first alignment mark of the first substrate, the first alignment mark of the second substrate, and the first alignment mark of the third substrate are formed in an active area.

9. The method for manufacturing a display device according to claim 1, wherein: The first alignment mark of the first substrate, the first alignment mark of the second substrate, and the first alignment mark of the third substrate are formed in a scribe line region and an active region.

10. The method for manufacturing a display device according to claim 1, further comprising: The 2-1 alignment mark of the second substrate is aligned with the second alignment mark of the first substrate.

11. The method for manufacturing a display device according to claim 10, wherein: A tolerance for aligning the first alignment mark of the first substrate with the first alignment mark of the second substrate is greater than a tolerance for aligning the second alignment mark of the first substrate with the 2-1 th alignment mark of the second substrate.

12. The method for manufacturing a display device according to claim 10, further comprising: The second alignment mark of the third substrate is aligned with a 2-2 alignment mark of the second substrate, and the 2-2 alignment mark of the second substrate is spaced apart from the 2-1 alignment mark of the second substrate.

13. The method for manufacturing a display device according to claim 12, wherein: A tolerance for aligning the first alignment mark of the second substrate with the first alignment mark of the third substrate is greater than a tolerance for aligning the 2-2nd alignment mark of the second substrate with the second alignment mark of the third substrate.

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