Display device

Abstract

To provide a display device which ensures visibility of a boundary of a grinding surface of each glass substrate.SOLUTION: A display device according to one exemplary embodiment disclosed herein includes a first substrate having a first grinding surface at an edge thereof, a second substrate facing the first substrate and having a second grinding surface at an edge thereof, a plurality of pixels disposed on one surface of the first substrate, a display area including the plurality of pixels, a non-display area disposed outside the display area, a dam disposed between the first substrate and the second substrate in the non-display area, and a first pattern provided outside the dam.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] This specification relates to a display device.

Background Art

[0002] As the information society develops, the requirements for display devices for displaying images are increasing in various forms. As a result, in recent years, various display devices such as liquid crystal display devices (LCDs), plasma display devices (PDPs), quantum dot light emitting display devices (QLEDs), and organic light emitting display devices (OLEDs) have been utilized.

[0003] A display device includes two substrates and can display an image by providing a plurality of pixels between the two substrates. The display device can form a curved surface or an inclined surface on each edge portion of the substrate through a polishing process using a grinder. In the polishing process, after polishing each edge portion of the substrate, the polishing amount can be measured using a vision camera, and product defects can be determined based on the resulting value.

Summary of the Invention

Problems to be Solved by the Invention

[0004] This specification aims to provide a display device capable of improving the boundary recognition rate of the polished surface during polishing amount measurement using a vision camera as a technical problem.

[0005] Moreover, this specification also aims to provide a display device that can reduce the generation of greenhouse gases that may be generated in the manufacturing process and achieve ESG (Environment / Social / Governance) as another technical problem.

Means for Solving the Problems

[0006] A display device according to an embodiment of the present specification includes a first substrate having a first polished surface at an end, a second substrate having a second polished surface at an end facing the first substrate, a plurality of pixels provided on one surface of the first substrate, a display area including the plurality of pixels, a non-display area disposed on the outer periphery of the display area, a dam provided in the non-display area between the first substrate and the second substrate, and a first pattern provided on the outer periphery of the dam.

Advantages of the Invention

[0007] According to the present specification, by providing the first pattern, the boundary of each polished surface of the glass substrate can be clearly recognized in the image acquired through the vision camera.

[0008] Moreover, the present specification can prevent the boundary of the polished surface of the glass substrate from being misrecognized. As a result, the present specification can reduce the misrecognition rate with respect to the boundary of the polished surface, and further reduce the defective processing due to misrecognition. The present specification can reduce the manufacturing process cost and shorten the manufacturing process time by reducing the product defect rate, and can further reduce the production energy. In addition, a display panel according to an embodiment of the present specification can reduce the generation of greenhouse gas that may be generated during the manufacturing process and can achieve ESG (Environment / Social / Governance).

[0009] Furthermore, the present specification can block the leakage of the dam so that the dam does not flow out externally or spread to the area where the plurality of first patterns are formed by providing a second pattern between the first patterns.

[0010] Also, the present specification can form the first pattern and the second pattern through the same process as the black matrix. As a result, the present specification can form the first pattern and the second pattern without adding a separate process.

[0011] The effects obtained in this specification are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those with ordinary knowledge in the technical field to which this specification belongs from the following description.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0013] The advantages and features of this specification, as well as the methods for achieving them, will become clear by referring to the embodiments described in detail below together with the accompanying drawings. However, this specification is not limited to the embodiments disclosed below, but is embodied in various different forms, and merely these embodiments are provided to make the disclosure of this specification complete and to fully inform those with ordinary knowledge in the technical field to which this specification belongs of the scope of the invention, and this specification is only defined by the scope of the claims.

[0014] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the figures for explaining the embodiments of this specification are exemplary, and this specification is not limited to the matters shown in the figures. Throughout the specification, the same reference numerals refer to the same components. In addition, in the description of this specification, when it is determined that a specific description of related known technologies may unnecessarily obscure the gist of this specification, the detailed description thereof is omitted. When terms such as "including", "having", "consisting of", etc. mentioned in this specification are used, other parts may be added unless "only" is used. When a component is expressed in the singular, it includes the case of including a plurality unless otherwise explicitly stated.

[0015] In interpreting a component, even if there is no separate explicit description of the error range, it is interpreted as including the error range.

[0016] In the case of an explanation of the positional relationship, for example, when the positional relationship between two parts is explained by "on ~", "above ~", "below ~", "beside ~", etc., unless the expressions "immediately" or "directly" are used, one or more other parts can also be located between the two parts.

[0017] In the case of an explanation of the time relationship, for example, when the chronological relationship is explained by "after ~", "subsequent to ~", "next ~", "before ~", etc., unless the expressions "immediately" or "directly" are used, the case of not being continuous can also be included.

[0018] First, second, etc. are used to explain various components, but these components are not limited by these terms. These terms are merely used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical idea of this specification.

[0019] The term "at least one" shall be understood to include all combinations of one or more of the associated components. For example, the meaning of "at least one of the first, second, and third components" can include not only the first, second, or third component alone, but also all combinations of two or more of the first, second, and third components.

[0020] The features of each of several embodiments herein can be combined or combined with each other partially or wholly, and various linkages and drives are technically possible. Each embodiment can be implemented independently of each other or implemented together in an associated relationship.

[0021] Hereinafter, preferred examples of the display device according to this specification will be described in detail with reference to the accompanying drawings. When adding reference signs to the components of each figure, the same components can have the same signs as much as possible even if they are shown in different figures. Also, in describing this specification, if it is determined that a detailed description of a related known configuration or function makes the gist of this specification unclear, the detailed description can be omitted.

[0022] Hereinafter, preferred embodiments of this specification will be described in detail with reference to the accompanying drawings.

[0023] FIG. 1 is a perspective view schematically showing a display device according to an embodiment of this specification, and FIG. 2 is a plan view schematically showing a display panel according to an embodiment of this specification. FIG. 3 is a plan view showing an example of sub-pixels provided on the display panel according to an embodiment of this specification.

[0024] Hereinafter, the X-axis indicates a direction parallel to the gate line, the Y-axis indicates a direction parallel to the data line, and the Z-axis indicates the height direction of the display device 100.

[0025] The display device 100 according to an embodiment of the present specification has been mainly described as being implemented as an organic light emitting display device. However, it can also be implemented as a liquid crystal display device, a plasma display panel (PDP), a quantum dot light emitting display device (QLED), or an electrophoresis display device.

[0026] Referring to FIGS. 1 to 3, the display device 100 according to an embodiment of the present specification includes a display panel 110, a source drive integrated circuit (hereinafter referred to as "IC") 210, a flexible film 220, a circuit board 230, and a timing control unit 240.

[0027] The display panel 110 includes a first substrate 111 and a second substrate 112 facing each other. The first substrate 111 and the second substrate 112 may be glass substrates and may be made of a transparent material. Hereinafter, the first substrate 111 will be referred to as the first glass substrate, and the second substrate 112 will be referred to as the second glass substrate.

[0028] The display panel 110 can be divided into a display area (DA) where pixels are formed to display an image and a non-display area (NDA) where no image is displayed.

[0029] The display area (DA) can include data lines (DL), gate lines (GL), and pixels (P), and the non-display area (NDA) can include a pad area (PA) where pads (PAD) are arranged and at least one gate driving unit 205.

[0030] The data lines (DL) can extend in a first direction (for example, the Y-axis direction) and can intersect the gate lines (GL) in the display area (DA). The gate lines (GL) can extend in a second direction (for example, the X-axis direction) in the display area (DA).

[0031] As shown in FIG. 3, the display area (DA) includes a transmissive area (TA) and a non-transmissive area (NTA). The transmissive area (TA) is an area that transmits most of the light incident from the outside, and the non-transmissive area (NTA) is an area that does not transmit most of the light incident from the outside. As an example, the transmissive area (TA) may be an area where the light transmittance is greater than α%, and the non-transmissive area (NTA) may be an area where the light transmittance is less than β%. Here, α is a value greater than β. The display device 100 can view things or backgrounds located on the back surface of the display device 100 through the transmissive area (TA) of the display panel 110.

[0032] The non-transmissive area (NTA) includes a plurality of pixels (P) and emits predetermined light to display an image. Each of the sub-pixels (SP1, SP2, SP3, SP4) can be any one of a first sub-pixel (SP1) that emits red light, a second sub-pixel (SP2) that emits green light, a third sub-pixel (SP3) that emits blue light, and a fourth sub-pixel (SP4) that emits white light, but is not necessarily limited thereto. The pixel (P) can include two or more sub-pixels (SP1, SP2, SP3, SP4). As an example, as shown in FIG. 3, the pixel (P) can include a first sub-pixel (SP1), a second sub-pixel (SP2), a third sub-pixel (SP3), and a fourth sub-pixel (SP4). Also, the arrangement order of the sub-pixels (SP1, SP2, SP3) can be changed in various ways.

[0033] A plurality of pads (PAD) can be arranged in the pad area (PA). The size of the first glass substrate 111 is formed larger than the size of the second glass substrate 112, and a part of the first glass substrate 111 can be exposed without being covered by the second glass substrate 112. Pads (PAD) such as power pads and data pads can be provided on a part of the first glass substrate 111 that is exposed without being covered by the second glass substrate 112.

[0034] The gate driving unit 205 is connected to a gate line (GL) to supply a gate signal. Such a gate driving unit 205 can be formed in a GIP (gate driver in panel) manner in a non-display area (NDA) outside one side or both sides of the display area (DA) of the display panel 110. Alternatively, the gate driving unit 205 can be fabricated on a driving chip, mounted on a flexible film, and attached to a non-display area (NDA) outside one side or both sides of the display area (DA) of the display panel 110 by a TAB (tape automated bonding) method.

[0035] The source drive IC 210 receives digital video data and a source control signal from the timing control unit 240. The source drive IC 210 converts the digital video data into an analog data voltage according to the source control signal and supplies it to the data line. When the source drive IC 210 is manufactured as a driving chip, it can be mounted on the flexible film 220 by a COF (Chip on Film) or COP (Chip on plastic) method.

[0036] On the flexible film 220, wirings connecting pads to the source drive IC 210 and wirings connecting pads to the circuit board 230 can be formed. The flexible film 220 can be attached onto the pads using an anisotropic conducting film, thereby connecting the pads to the wirings of the flexible film 220.

[0037] The circuit board 230 can be attached to the flexible film 220. The circuit board 230 can mount a number of circuits implemented on a driving chip. For example, the timing control unit 240 can be mounted on the circuit board 230. The circuit board 150 can be a printed circuit board or a flexible printed circuit board.

[0038] The timing control unit 240 inputs digital video data and a timing signal from an external system board (not shown). The timing control unit 240 generates a gate control signal for controlling the operation timing of the gate driving unit 205 and a source control signal for controlling the source drive IC 210 based on the timing signal. The timing control unit 240 supplies the gate control signal to the gate driving unit 205 and the source control signal to the source drive IC 210.

[0039] FIG. 4 is a plan view showing a first pattern and a second pattern provided on a display panel according to an embodiment of the present specification, FIG. 5 is a view showing an example of I-I' in FIG. 4, FIG. 6 is a view showing an example of II-II' in FIG. 4, and FIG. 7 is a view showing an example of III-III' in FIG. 4. FIG. 8 is a view showing an example of a bottom surface image acquired via a vision camera, and FIG. 9 is a view showing an example of a top surface image acquired via a vision camera.

[0040] Referring to FIGS. 4 to 7, a display panel 110 according to an embodiment of the present specification can be divided into a display area (DA) for displaying an image and a non-display area (NDA) for not displaying an image. In the display area (DA), pixels (P) can be provided to display an image.

[0041] Each of the plurality of pixels (P) can include a first sub-pixel (SP1), a second sub-pixel (SP2), a third sub-pixel (SP3), and a fourth sub-pixel (SP4). As shown in FIGS. 5 to 7, each of the first to fourth sub-pixels (SP1, SP2, SP3, SP4) can include a circuit element (T), a first electrode (E1), an organic layer (EL), and a second electrode (E2) between the first glass substrate 111 and the second glass substrate 112 to form a light-emitting element (ED).

[0042] The circuit element (T) is provided on the first glass substrate 111 and can include various signal wirings, thin film transistors, capacitors, and the like. The circuit element (T) can be provided separately for each sub-pixel (SP1, SP2, SP3, SP4). The signal wiring can include a gate wiring, a data wiring, a driving power supply wiring, a common power supply wiring, and a reference wiring, and the thin film transistor can include a switching thin film transistor, a driving thin film transistor, and a sensing thin film transistor.

[0043] On the circuit element (T), a planarization film 120 for planarizing the step generated by the circuit element (T) can be disposed. The planarization film 120 can be provided in the display area (DA). The planarization film 120 can be provided in the non-transmissive area (NTA) and may not be provided in at least a part of the transmissive area (TA). The planarization film 120 can induce refraction of light while the light passes through, thereby inhibiting transparency. Thus, the transparent display panel 110 according to an embodiment of the present specification can improve transparency by removing a part of the planarization film 120 in the transmissive area (TA).

[0044] The planarization film 120 can extend from the display area (DA) to a part of the non-display area (NDA). The planarization film 120 can be formed to cover the gate driving unit 205 provided in the non-display area (NDA).

[0045] The planarization film 120 can be formed of an organic insulating material such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0046] On the planarization film 120, a light emitting element (ED) including a first electrode (E1), an organic layer (EL), and a second electrode (E2), and a bank (BN) can be provided.

[0047] The first electrode (E1) can be provided separately for each sub-pixel (SP1, SP2, SP3, SP4) on the planarization film 120. The first electrode (E1) can be electrically connected to a circuit element (T), particularly a driving transistor. Specifically, the first electrode (E1) can be connected to one of the source electrode and the drain electrode of the driving transistor via a contact hole (CH) penetrating the planarization film 120. A bank (BN) is provided between the first electrodes (E1) adjacent to each other, and the bank (BN) can electrically insulate the adjacent first electrodes (E1) from each other.

[0048] The first electrode (E1) can be formed of a highly reflective metal material such as a laminated structure of aluminum and titanium (Ti / Al / Ti), a laminated structure of aluminum and ITO (ITO / Al / ITO), an Ag alloy, a laminated structure of an Ag alloy and ITO (ITO / Ag alloy / ITO), a MoTi alloy, and a laminated structure of a MoTi alloy and ITO (ITO / MoTi alloy / ITO). The Ag alloy can be an alloy such as silver (Ag), palladium (Pd), and copper (Cu). The MoTi alloy can be an alloy of molybdenum (Mo) and titanium (Ti). Such a first electrode (E1) can be an anode electrode.

[0049] The bank (BN) can be provided on the planarization film 120. Also, the bank (BN) can be formed to cover the end portion of the first electrode (E1) and expose a part of the first electrode (E1). Thereby, the bank (BN) can prevent the problem that current concentrates at the tip of the first electrode (E1) and the light emission efficiency decreases.

[0050] The bank (BN) can define the light-emitting regions of the respective sub-pixels (SP1, SP2, SP3, SP4). The light-emitting regions of the respective sub-pixels (SP1, SP2, SP3, SP4) indicate regions where the first electrode (E1), the organic layer (EL), and the second electrode (E2) are stacked in sequence, and holes from the first electrode (E1) and electrons from the second electrode (E2) combine with each other in the organic layer (EL) to emit light. In this case, the region where the bank (BN) is formed becomes a non-light-emitting region because it does not emit light, and the region where the bank (BN) is not formed and the first electrode (E1) is exposed can become the light-emitting region.

[0051] The organic layer (EL) can be provided on the first electrode (E1). The organic layer (EL) can include a hole transport layer, a light-emitting layer, and an electron transport layer. In this case, when a voltage is applied to the first electrode (E1) and the second electrode (E2), holes and electrons move to the light-emitting layer through the hole transport layer and the electron transport layer respectively, and combine with each other in the light-emitting layer to emit light.

[0052] In one embodiment, the organic layer (EL) can be a common layer formed commonly for the sub-pixels (SP1, SP2, SP3, SP4). Here, the light-emitting layer can be a white light-emitting layer that emits white light.

[0053] In another embodiment, the organic layer (EL) can form the light-emitting layer separately for each of the sub-pixels (SP1, SP2, SP3, SP4). As an example, a red light-emitting layer that emits red light can be formed in the first sub-pixel (SP1), a green light-emitting layer that emits green light can be formed in the second sub-pixel (SP2), and a blue light-emitting layer that emits blue light can be formed in the third sub-pixel (SP3). A white light-emitting layer that emits white light can be formed in the fourth sub-pixel (SP4).

[0054] The second electrode (E2) can be provided on the organic layer (EL) and the bank (BN). The second electrode (E2) can be formed of a transparent metal material (TCO, Transparent Conductive Material) such as ITO or IZO that allows light to pass through, or a semi-transmissive conductive material such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag). When the second electrode (E2) is formed of a semi-transmissive conductive material, the light extraction efficiency can be increased by a micro cavity. Such a second electrode (E2) can be a cathode electrode.

[0055] A sealing layer 130 can be provided on the light-emitting element (ED). The sealing layer 130 can be formed to cover the second electrode (E2) on the second electrode (E2). The sealing layer 130 serves to prevent oxygen or moisture from penetrating into the organic layer (EL) and the second electrode (E2). For this purpose, the sealing layer 130 can include at least one inorganic film. The sealing layer 130 can further include at least one organic film. In such a case, the inorganic film can be disposed at the top of the sealing layer 130. The sealing layer 130 can cover the display area (DA) and extend from the display area (DA) to a part of the non-display area (NDA). The sealing layer 130 can be formed to cover the light-emitting element (ED) as well as the planarization film 120 and the bank (BN).

[0056] The inorganic film provided in the sealing layer 130 can be formed of a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multilayer film thereof. The organic film provided in the sealing layer 130 can be formed of an organic insulating material such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0057] A capping layer (CPL) can be further provided between the light-emitting element (ED) and the encapsulation layer 130. The capping layer (CPL) can be provided to cover the second electrode (E2) on the second electrode (E2). The capping layer (CPL) can improve the viewing angle characteristics and improve the external light emission efficiency. Such a capping layer (CPL) can include at least one of an inorganic substance and an organic substance having light transmissivity.

[0058] A color filter (CF) can be provided on one surface of the second glass substrate 112 facing the first glass substrate 111. The color filter (CF) can be patterned for each sub-pixel (SP1, SP2, SP3, SP4). As an example, the color filter (CF) can include a first color filter, a second color filter, a third color filter, and a fourth color filter. The first color filter can be arranged to correspond to the first sub-pixel (SP1) and can be, for example, a red color filter that transmits red light. The second color filter can be arranged to correspond to the second sub-pixel (SP2) and can be a green color filter that transmits green light. The third color filter (CF3) can be arranged to correspond to the third sub-pixel (SP3) and can be a blue color filter that transmits blue light. The fourth color filter can be arranged to correspond to the fourth sub-pixel (SP4) and can be a white color filter that transmits white light. The white color filter can be made of a transparent organic substance that transmits white light, but is not necessarily limited thereto.

[0059] A black matrix (BM) can be provided between color filters (CF). The black matrix (BM) is provided between sub-pixels (SP1, SP2, SP3, SP4) and can prevent color mixing from occurring between adjacent sub-pixels (SP1, SP2, SP3, SP4). Also, the black matrix (BM) can prevent light incident from the outside from being reflected by a plurality of signal lines provided between the sub-pixels (SP1, SP2, SP3, SP4). Such a black matrix (BM) can contain a light-absorbing substance, for example, a black dye that absorbs all light in the visible light wavelength band.

[0060] A filling material 140 can be provided between a first glass substrate 111 including a light-emitting element (ED) and a second glass substrate 112 including a color filter (CF) and a black matrix (BM). Here, as the filling material 140, a thermosetting resin or a UV curable resin can be used, and it can be made of an organic substance having adhesiveness. In one embodiment, the filling material 140 can contain a substance that absorbs hydrogen.

[0061] In a non-display area (NDA), a pad area (PA) where pads (PAD) are arranged, dams (DAM), and a first pattern (PTN1) can be provided. In one embodiment, a second pattern (PTN2) can be further provided in the non-display area (NDA).

[0062] The dam (DAM) can be provided between the first glass substrate 111 and the second glass substrate 112 in the non-display area (NDA). By forming the dam (DAM) so as to be in contact with each of the first glass substrate 111 and the second glass substrate 112 between the first glass substrate 111 and the second glass substrate 112, the first glass substrate 111 and the second glass substrate 112 can be joined together.

[0063] Also, the dam (DAM) can be provided so as to surround the display area (DA) at a distance from the display area (DA). The dam (DAM) can be arranged so as to be separated from the ends (EG1, EG2, EG3, EG4) of the second glass substrate 112. That is, the dam (DAM) can be formed so as to surround the display area (DA) between the ends (EG1, EG2, EG3, EG4) of the second glass substrate 112 and the display area (DA).

[0064] Also, the dam (DAM) can be separated from the display area (DA) with the gate driving unit 205 sandwiched therebetween in the non-display area (NDA). Here, the dam (DAM) can be provided so as not to overlap with the gate driving unit 205 provided in the non-display area (NDA).

[0065] The dam (DAM) can block the leakage of the filling material 140 so that the filling material 140 filled inside does not flow out. The inner surface (IS) of the dam (DAM) may be in contact with the filling material 140, and the outer surface (OS) may be exposed to the outside and not in contact with the filling material 140. Such a dam (DAM) can be made of various substances known in the art, such as a thermosetting resin or a UV curable resin.

[0066] The first pattern (PTN1) is provided on the outer contour of the dam (DAM). That is, the first pattern (PTN1) can be provided between the ends (EG1, EG2, EG3, EG4) of the second glass substrate 112 and the dam (DAM). Here, as shown in FIG. 5, the first pattern (PTN1) can be arranged adjacent to the ends (EG1, EG2, EG3, EG4) of the second glass substrate 112 and arranged at a distance from the dam (DAM).

[0067] Further, the first pattern (PTN1) can be provided so as to at least partially overlap with the first polished surface (GE1) of the first glass substrate 111 and the second polished surface (GE2) of the second glass substrate 112. The first polished surface (GE1) provided on the first glass substrate 111 and the second polished surface (GE2) provided on the second glass substrate 112, which are arranged to face each other, can be formed by polishing the first glass substrate 111 and the second glass substrate 112 respectively using a polishing machine.

[0068] Specifically, the first glass substrate 111 includes a first upper surface (US1), a first lower surface (BS1), and a first polished surface (GE1) at an end portion. The first upper surface (US1) of the first glass substrate 111 is a surface facing the second glass substrate 112 and can be a surface on which a light-emitting element (ED) is provided. The first lower surface (BS1) of the first glass substrate 111 can be a surface exposed to the outside. The first polished surface (GE1) of the first glass substrate 111 is formed by polishing the end portion of the first glass substrate 111 using a polishing machine, and can be an inclined surface inclined from the first lower surface (BS1) toward the first upper surface (US1) as shown in FIGS. 5 to 7, but is not necessarily limited thereto. The first polished surface (GE1) may also be a curved surface depending on the polishing form.

[0069] Such a first polished surface (GE1) can be provided at at least one side end portion of the first glass substrate 111. As an example, the first polished surface (GE1) can be provided at all side end portions of the first glass substrate 111, but is not necessarily limited thereto.

[0070] At the end of the first glass substrate 111, a first edge (SE1) can be further provided. The first edge surface (SE1) is disposed between the first polishing surface (GE1) and the first upper surface (US1), and can connect the first polishing surface (GE1) and the first upper surface (US1). The first edge surface (SE1) is provided on the outermost contour of the first glass substrate 111, and as shown in FIGS. 5 to 7, it can extend perpendicularly from the outermost contour of the upper surface (US1) in the direction of the first lower surface (BS1), but is not necessarily limited thereto. The first edge surface (SE1) may extend so as to be inclined from the outermost contour of the first upper surface (US1) in the direction of the first lower surface (BS1).

[0071] The first polishing surface (GE1) is disposed between the first edge surface (SE1) and the first lower surface (BS1), and can connect the first edge surface (SE1) and the first lower surface (BS1). The first edge surface (SE1) is not necessarily provided and can be omitted depending on the design. In such a case, the first polishing surface (GE1) can connect the first upper surface (US1) and the first lower surface (BS1) between the first upper surface (US1) and the first lower surface (BS1) of the first glass substrate 111.

[0072] The second glass substrate 112 may include a second upper surface (US2), a second lower surface (BS2), and a second polishing surface (GE2) at the end. The second upper surface (US2) of the second glass substrate 112 can be a surface that is exposed to the outside, unlike the first glass substrate 112. The second lower surface (BS2) of the second glass substrate 112 is a surface facing the first glass substrate 111, and can be a surface on which a color filter (CF) and a black matrix (BM) are provided. The second polishing surface (GE2) of the second glass substrate 112 is formed by polishing the end of the second glass substrate 112 using a polishing machine, and can be an inclined surface inclined from the second upper surface (US2) in the direction of the second lower surface (BS2) as shown in FIGS. 5 to 7, but is not necessarily limited thereto. The second polishing surface (GE2) may be a curved surface depending on the polishing form.

[0073] Such a second polishing surface (GE2) can be provided at at least one side end of the second glass substrate 112. However, the second polishing surface (GE2) may not be provided at the end (EG1) adjacent to the pad region (PA). The second glass substrate 112 can include a first end (EG1) arranged adjacent to the pad region (PA) as shown in FIG. 4, a second end (EG2) arranged opposite to the first end (EG1), a third end (EG3) and a fourth end (EG4) connecting the first end (EG1) and the second end (EG2). The second polishing surface (GE2) can be provided on at least one of the second to fourth ends (EG2, EG3, EG4) excluding the first end (EG1).

[0074] The first end (EG1) of the second glass substrate 112 can be configured such that the pad (PAD) provided on the first glass substrate 111 is exposed. When the first end (EG1) of the second glass substrate 112 is polished, the exposed pad (PAD) may be damaged by the polishing machine. Therefore, in order to prevent the pad (PAD) from being damaged, the first end (EG1) of the second glass substrate 112 may not be polished by the polishing machine. As an example, the second polishing surface (GE2) can be provided on all of the second to fourth ends (EG2, EG3, EG4) of the second glass substrate 112, but is not necessarily limited thereto.

[0075] The second glass substrate 112 can further include a second edge surface (SE2) at the end. The second edge surface (SE2) can connect the second polishing surface (GE2) and the second lower surface (BS2) between the second polishing surface (GE2) and the second lower surface (BS2). The second edge surface (SE2) is provided on the outermost contour of the second glass substrate 112 and can extend perpendicularly from the outermost contour of the second lower surface (BS2) in the direction of the second upper surface (US2) as shown in FIGS. 5 to 7, but is not necessarily limited thereto. The second edge surface (SE2) may extend so as to be inclined from the outermost contour of the second lower surface (BS2) in the direction of the second upper surface (US2).

[0076] The second grinding surface (GE2) is provided between the second edge surface (SE2) and the second upper surface (US2), and can connect the second edge surface (SE2) and the second upper surface (US2). The second edge surface (SE2) does not necessarily have to be provided and can be omitted depending on the design. In such a case, the second grinding surface (GE2) can connect the second upper surface (US2) and the second lower surface (BS2) between the second upper surface (US2) and the second lower surface (BS2) of the second glass substrate 112.

[0077] The first pattern (PTN1) can be provided on at least one surface of the first glass substrate 111 and the second glass substrate 112. The first pattern (PTN1) is provided on the first upper surface (US1) of the first glass substrate 111 and can overlap at least a part of the first grinding surface (GE1) of the first glass substrate 111. Alternatively, as shown in FIG. 5, the first pattern (PTN1) is provided on the second lower surface (BS2) of the second glass substrate 112 and can overlap at least a part of the second grinding surface (GE2) of the second glass substrate 112.

[0078] In one embodiment, the first pattern (PTN1) can contain the same substance as the black matrix (BM). The first pattern (PTN1) can contain a light-absorbing substance such as the black matrix (BM), for example, a black dye that absorbs all light in the visible light wavelength band. The first pattern (PTN1) can be formed through the same process as the black matrix (BM). Thus, in the embodiment where the first pattern (PTN1) is formed in the same process as the black matrix (BM), since a separate process for forming the first pattern (PTN1) is not required, the first pattern (PTN1) can be formed in a simple process.

[0079] The end of the first pattern (PTN1) can be provided at the same position on a perpendicular line to the second edge surface (SE2) of the second glass substrate. Specifically, as shown in FIG. 5, the first pattern (PTN1) can be provided at the same position on a perpendicular line to the second edge surface (SE2) of the second glass substrate with an edge surface (SE3) provided at the outer end.

[0080] The first pattern (PTN1) can be formed to have a predetermined width (W3) from the same position on a perpendicular line to the second edge surface (SE2) of the second glass substrate toward the dam (DAM). Here, the width (W3) of the first pattern (PTN1) can be made larger than the first width (W1) of the first polishing surface (GE1) of the first glass substrate 111 and the second width (W2) of the second polishing surface (GE2) of the second glass substrate 112. The first width (W1) of the first polishing surface (GE1) of the first glass substrate 111 and the second width (W2) of the second polishing surface (GE2) of the second glass substrate 112 can be the same as each other or can be different from each other. As an example, the first width (W1) of the first polishing surface (GE1) of the first glass substrate 111 may be larger than the second width (W2) of the second polishing surface (GE2) of the second glass substrate 112. In this way, even if the first width (W1) of the first polishing surface (GE1) of the first glass substrate 111 and the second width (W2) of the second polishing surface (GE2) of the second glass substrate 112 are different from each other, the third width (W3) of the first pattern (PTN1) may be larger than not only the second width (W2) of the second polishing surface (GE2) of the second glass substrate 112 but also the first width (W1) of the first polishing surface (GE1) of the first glass substrate 111.

[0081] The display panel 110 according to an embodiment of the present specification can measure the polishing amount of each of the first polishing surface (GE1) of the first glass substrate 111 and the second polishing surface (GE2) of the second glass substrate 112 using the first pattern (PTN1). Specifically, generally, the polishing amount can be measured using a vision camera system after the polishing process. The vision camera system can photograph an end region including the first polishing surface (GE1) of the first glass substrate 111 and can identify the boundary of the first polishing surface (GE1) of the first glass substrate 111 in the photographed image. The vision camera system can measure the polishing amount based on the identified boundary of the first polishing surface (GE1).

[0082] For example, after arranging the vision camera system under the display panel 110, the vision camera system can capture an end region including the first polished surface (GE1) of the first glass substrate 111 to obtain a bottom surface image as shown in FIG. 8. The vision camera system can identify a boundary with a large difference in brightness in the bottom surface image as the boundary of the first polished surface (GE1). The vision camera system can recognize a first boundary (GB1a) and a second boundary (GB1b) with a large difference in brightness in the bottom surface image as shown in FIG. 8 as the boundaries of the first polished surface (GE1), respectively. Depending on the form of the first polished surface (GE1), the first boundary (GB1a) can be the boundary of the first glass substrate 111 and also the boundary of the first polished surface (GE1). The vision camera system can determine the polishing amount based on the distance between the first boundary (GB1a) and the second boundary (GB1b), that is, the first width (W1) of the first polished surface (GE1).

[0083] In addition, the vision camera system can capture an end region including the second polished surface (GE2) of the second glass substrate 112 and identify the boundary of the second polished surface (GE2) of the second glass substrate 112 in the captured image. The vision camera system can measure the polishing amount based on the identified boundary of the second polished surface (GE2).

[0084] For example, after arranging the vision camera system with the vision camera on the display panel 110, an upper surface image can be acquired by photographing an end region including the second polished surface (GE2) of the second glass substrate 112 as shown in FIG. 9. The vision camera system can identify a boundary with a large difference in brightness in the upper surface image as the boundary of the second polished surface (GE2). The vision camera system can recognize a first boundary (GB2a) and a second boundary (GB2b) with a large difference in brightness in the upper surface image as shown in FIG. 9 as the boundaries of the second polished surface (GE2), respectively. Depending on the form of the second polished surface (GE2), the first boundary (GB2a) can be the boundary of the second glass substrate 112 and also the boundary of the second polished surface (GE2). The vision camera system can determine the polishing amount based on the distance between the first boundary (GB2a) and the second boundary (GB2b), that is, the second width (W2) of the second polished surface (GE2).

[0085] The display panel 110 according to an embodiment of the present specification can be formed by overlapping the first pattern (PTN1) with the first polished surface (GE1) of the first glass substrate 111 and the second polished surface (GE2) of the second glass substrate 112, so that the boundaries of the first polished surface (GE1) of the first glass substrate 111 and the second polished surface (GE2) of the second glass substrate 112 in the image acquired through the vision camera appear more clearly.

[0086] According to an embodiment of the present specification, the display panel 110 can be configured such that in the bottom surface image acquired through the vision camera, the first pattern (PTN1) has a third width (W3) that is larger than the first width (W1) of the first polishing surface (GE1) in order to prevent other boundaries from occurring inside the first polishing surface (GE1). When the first pattern (PTN1) has a width smaller than the first width (W1) of the first polishing surface (GE1), the bottom surface image acquired through the vision camera can include a boundary between a region where the first polishing surface (GE1) and the first pattern (PTN1) overlap inside the first polishing surface (GE1) and a region where the first polishing surface (GE1) and the first pattern (PTN1) do not overlap. As a result, the vision camera system can misrecognize the boundary between the region where the first polishing surface (GE1) and the first pattern (PTN1) overlap and the region where the first polishing surface (GE1) and the first pattern (PTN1) do not overlap as the boundary of the first polishing surface (GE1). To prevent this, the display panel 110 according to an embodiment of the present specification can be configured such that the first pattern (PTN1) has a third width (W3) that is larger than the first width (W1) of the first polishing surface (GE1). Through this, the bottom surface image acquired through the vision camera may not have a boundary generated inside the first polishing surface (GE1).

[0087] Also, the display panel 110 according to an embodiment of the present specification can be configured such that in the top surface image acquired by the vision camera, the first pattern (PTN1) has a third width (W3) that is larger than the second width (W2) of the second polishing surface (GE2) in order to prevent other boundaries from occurring inside the second polishing surface (GE2). When the first pattern (PTN1) has a width smaller than the second width (W2) of the second polishing surface (GE2), the top surface image acquired through the vision camera can include a boundary between a region where the second polishing surface (GE2) and the first pattern (PTN1) overlap and a region where the second polishing surface (GE2) and the first pattern (PTN1) do not overlap inside the second polishing surface (GE2). As a result, the vision camera system can misrecognize the boundary between the region where the second polishing surface (GE2) and the first pattern (PTN1) overlap and the region where the second polishing surface (GE2) and the first pattern (PTN1) do not overlap as the boundary of the second polishing surface (GE2). To prevent this, the display panel 110 according to an embodiment of the present specification can be configured such that the first pattern (PTN1) has a third width (W3) that is larger than the first width (W1) of the second polishing surface (GE2).

[0088] In addition, the display panel 110 according to an embodiment of the present specification can have an edge surface (SE3) provided at an outer end of the first pattern (PTN1) at the same position on a vertical line as a second edge surface (SE2) of the second glass substrate 112. When the edge surface (SE3) of the first pattern (PTN1) is arranged closer to the dam (DAM) than the second edge surface (SE2) of the second glass substrate 112, the top surface image acquired through the vision camera can include a boundary between a region where the second polishing surface (GE2) and the first pattern (PTN1) overlap inside the second polishing surface (GE2) and a region where the second polishing surface (GE2) and the first pattern (PTN1) do not overlap. As a result, the vision camera system can misrecognize the boundary between the region where the second polishing surface (GE2) and the first pattern (PTN1) overlap and the region where the second polishing surface (GE2) and the first pattern (PTN1) do not overlap as the boundary of the second polishing surface (GE2). To prevent this, the display panel 110 according to an embodiment of the present specification can have the edge surface (SE3) of the first pattern (PTN1) at the same position on a vertical line as the second edge surface (SE2) of the second glass substrate 112. Thereby, the top surface image acquired through the vision camera may not have a boundary generated inside the second edge surface (SE2).

[0089] In addition, the display panel 110 according to an embodiment of the present specification can identify the boundary of the first pattern (PTN1) in the image acquired through the vision camera by arranging the first pattern (PTN1) at a distance from the dam (DAM). When the first pattern (PTN1) and the dam (DAM) overlap, the image acquired through the vision camera has an image that is all dark in the area where the first pattern (PTN1) and the dam (DAM) are formed, and the area where the first pattern (PTN1) and the dam (DAM) overlap can have a relatively darker image. As a result, the vision camera system cannot clearly identify the boundary of the first pattern (PTN1) and the boundary of the dam (DAM), and may misrecognize a relatively dark area, such as the area where the first pattern (PTN1) and the dam (DAM) overlap, as the boundary of the first polishing surface (GE1) of the first glass substrate 111 or misrecognize it as the boundary of the second polishing surface (GE2) of the second glass substrate 112.

[0090] To prevent this, the display panel 110 according to an embodiment of the present specification can arrange the first pattern (PTN1) at a distance from the dam (DAM). In this case, since the image acquired through the vision camera has a bright image in the area where the first pattern (PTN1) and the dam (DAM) are separated, the boundary of the first pattern (PTN1) and the boundary of the dam (DAM) can appear clearly. The vision camera system can identify the boundary of the first pattern (PTN1) and identify the boundary of the first polishing surface (GE1) of the first glass substrate 111 and the boundary of the second polishing surface (GE2) of the second glass substrate 112 within the first pattern (PTN1).

[0091] As a result, the display panel 110 according to an embodiment of the present specification includes a first pattern (PTN1), and thus, in a vision camera system, the boundaries of the first polished surface (GE1) of the first glass substrate 111 and the boundaries of the second polished surface (GE2) of the second glass substrate 112 during polishing amount measurement can be accurately identified. The display panel 110 according to an embodiment of the present specification can reduce the misrecognition rate of the boundaries of the first polished surface (GE1) of the first glass substrate 111 and the boundaries of the second polished surface (GE2) of the second glass substrate 112, and further reduce defective processing due to misrecognition. The display panel 110 according to an embodiment of the present specification can reduce the manufacturing process cost by reducing the product defect rate, shorten the manufacturing process time, and further reduce production energy. In addition, the display panel 110 according to an embodiment of the present specification can reduce the generation of greenhouse gases that may be generated during the manufacturing process and achieve ESG (Environment / Social / Governance).

[0092] The first pattern (PTN1) may be provided at at least one side end of the first glass substrate 111 or the second glass substrate 112. Since the first pattern (PTN1) is used during the polishing amount measurement of the first polished surface (GE1) of the first glass substrate 111 and the second polished surface (GE2) of the second glass substrate 112 as described above, it can be arranged at the end where the first polished surface (GE1) of the first glass substrate 111 and the second polished surface (GE2) of the second glass substrate 112 are formed.

[0093] As shown in FIG. 5, the first pattern (PTN1) can be formed on one surface of the second glass substrate 112 and can be provided at at least one side end where the second polishing surface (GE2) of the second glass substrate 112 is formed. As an example, the second polishing surface (GE2) of the second glass substrate 112 can be provided at the second to fourth ends (EG2, EG3, EG4) excluding the first end (EG1) adjacent to the pad region (PA). In this case, the first pattern (PTN1) can be provided at the second to fourth ends (EG2, EG3, EG4) excluding the first end (EG1) of the second glass substrate 112. The first pattern (PTN1) may not be arranged between the pad region (PA) and the display region (DA).

[0094] A plurality of the first patterns (PTN1) can be spaced apart along at least one side end of the first glass substrate 111 or the second glass substrate 112. The first pattern (PTN1) can be formed as a pattern having a predetermined size in the region photographed by the vision camera. As shown in FIG. 4, the first pattern (PTN1) can include a plurality at one side end, and the plurality of first patterns (PTN1) can be arranged spaced apart from each other. As an example, a plurality of the first patterns (PTN1) can be spaced apart and arranged along each of the second to fourth ends (EG2, EG3, EG4) of the second glass substrate 112.

[0095] The display panel 110 according to an embodiment of the present specification can further include a second pattern (PTN2) between the plurality of first patterns (PTN1).

[0096] The second pattern (PTN2) is provided on the outer contour of the dam (DAM) like the plurality of first patterns (PTN1), and can block the leakage of the dam (DAM) so that the dam (DAM) does not flow out externally or spread to the region where the plurality of first patterns (PTN1) are formed.

[0097] The second pattern (PTN2) can be arranged in plurality and spaced apart along at least one side end of the first glass substrate 111 or the second glass substrate 112, like the plurality of first patterns (PTN1). Here, the plurality of first patterns (PTN1) and the plurality of second patterns (PTN2) can be arranged alternately along at least one side end of the first glass substrate 111 or the second glass substrate 112.

[0098] As an example, as shown in FIGS. 6 and 7, the second pattern (PTN2) can be formed on one surface of the second glass substrate 112 like the first pattern (PTN1), and can be provided at at least one side end of the second glass substrate 112. However, the first pattern (PTN1) is not provided at the first end (EG1) of the second glass substrate 112, but the second pattern (PTN2) can also be provided at the first end (EG1) of the second glass substrate 112. The second pattern (PTN2) can be provided at the first to fourth ends (EG1, EG2, EG3, EG4) of the second glass substrate 112. That is, the first pattern (PTN1) may not be arranged between the pad region (PA) and the display region (DA), but the second pattern (PTN2) can be arranged between the pad region (PA) and the display region (DA). The second pattern (PTN2) extends long along the first end (EG1) to block the leakage of the dam (DAM) so that the dam (DAM) does not spread to the pad region (PA).

[0099] The second pattern (PTN2) can have a fourth width (W4) smaller than the third width (W3) of the first pattern (PTN1). As shown in FIGS. 6 and 7, an edge surface (SE4) provided at an outer end of the second pattern (PTN2) can be located inside the second edge surface (SE2) of the second glass substrate in the dam (DAM) direction. That is, the second pattern (PTN2) can be formed to have a predetermined width (W4) toward the dam (DAM) at a position inside the second edge surface (SE2) of the second glass substrate 112 in the dam (DAM) direction. Here, the fourth width (W4) of the second pattern (PTN2) may be smaller than the third width (W3) of the first pattern (PTN1).

[0100] In one embodiment, as shown in FIG. 4, the second pattern (PTN2) can be composed of a plurality of sub-patterns (SUBP) between two adjacent first patterns (PTN1). Here, as shown in FIGS. 6 and 7, the plurality of sub-patterns (SUBP) provided between two adjacent first patterns (PTN1) each have a fifth width (W5) and can be arranged spaced apart from the dam (DAM) in the external direction. The display panel 110 can form an uneven surface by the plurality of sub-patterns (SUBP) arranged spaced apart from the dam (DAM) in the external direction, and the uneven surface can more effectively block the leakage of the dam (DAM).

[0101] On the other hand, the second pattern (PTN2) can be arranged closer to the dam (DAM) than the first pattern (PTN1). Specifically, the first pattern (PTN1) can have a first separation distance (S1) from the dam (DAM). The second pattern (PTN2) can have a second separation distance (S2) smaller than the first separation distance (S1) from the dam (DAM). Thereby, the display panel 110 according to an embodiment of the present specification can block the leakage by the second pattern (PTN2) before the dam (DAM) spreads to the region where the first pattern (PTN1) is formed.

[0102] In one embodiment, the second pattern (PTN2) can contain the same material as the black matrix (BM), similar to the first pattern (PTN1). The second pattern (PTN2) can contain a light-absorbing material such as a black dye that absorbs all light in the visible light wavelength band, like the black matrix (BM). The second pattern (PTN2) can be formed through the same process as the black matrix (BM). Thus, in an embodiment where the first pattern (PTN1) and the second pattern (PTN2) are formed in the same process as the black matrix (BM), the first pattern (PTN1) and the second pattern (PTN2) can be formed without adding a separate process.

[0103] As described above, the embodiments of this specification have been described in more detail with reference to the accompanying drawings. However, this specification is not necessarily limited to such embodiments, and various modifications can be made and implemented without departing from the technical idea of this specification. Therefore, the embodiments disclosed in this specification are for the purpose of explaining rather than limiting the technical idea of this specification, and do not limit the scope of the technical idea of this specification by such embodiments. Therefore, it must be understood that the above-described embodiments are exemplary in all respects and not restrictive. The protection scope of this specification must be interpreted by the scope of the claims, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of this specification.

Claims

1. a first substrate having a first polishing surface at an end; a second substrate facing the first substrate and having a second polishing surface at an end; a plurality of pixels provided on one surface of the first substrate; a display area including the plurality of pixels; a non-display area disposed on the outer periphery of the display area; a dam provided between the first substrate and the second substrate in the non-display area; a display device including a first pattern provided on the outer periphery of the dam.

2. The display device according to claim 1, wherein the first pattern is disposed spaced apart from the dam.

3. The display device according to claim 1, wherein the first pattern overlaps at least a part of the first polishing surface and at least a part of the second polishing surface.

4. The display device according to claim 1, wherein the first pattern has a third width that is larger than a first width of the first polishing surface and a second width of the second polishing surface.

5. The display device according to claim 4, wherein the first width of the first polishing surface is different from the second width of the second polishing surface.

6. The display device according to claim 1, wherein a plurality of the first patterns are spaced apart along an end of at least one side of the first substrate or the second substrate.

7. The display device according to claim 1, wherein the first pattern is disposed on one surface of the second substrate.

8. the second substrate includes an edge surface disposed at an end, The display device according to claim 7, wherein the first pattern includes an edge surface formed at the same position on a perpendicular line to the edge surface of the second substrate.

9. further including a pad area where a plurality of pads are disposed, The display device according to claim 1, wherein the first pattern is not disposed between the display area and the pad area.

10. The display device according to claim 1, further including a second pattern provided on the outer periphery of the dam and disposed between adjacent first patterns.

11. The display device according to claim 10, wherein the second pattern has a fourth width that is smaller than the third width of the first pattern.

12. the second substrate includes an edge surface disposed at an end, The display device according to claim 10, wherein the second pattern has an edge surface formed at a position inside the dam in a direction from the edge surface of the second substrate.

13. The display device according to claim 10, wherein the second pattern is disposed closer to the dam than the first pattern.

14. The display device according to claim 10, wherein the second pattern is provided along at least one end portion of the second substrate and is disposed apart from the first pattern.

15. The display device according to claim 10, wherein the second pattern includes a plurality of sub-patterns disposed between two adjacent first patterns.

16. Further including a pad region in which a plurality of pads are disposed, The display device according to claim 10, wherein the second pattern is disposed between the display region and the pad region.

17. Further including a color filter provided on one surface of the second substrate, and a black matrix provided between the color filters on one surface of the second substrate, The display device according to claim 1, wherein the first pattern is made of the same material as the black matrix on one surface of the second substrate.

18. Further including a gate driving unit provided on one surface of the first substrate and disposed on at least one side of the display region, The display device according to claim 1, wherein the gate driving unit is disposed between the dam and the display region.

19. The display device according to claim 1, wherein the display region includes a light emitting region provided with a plurality of light emitting elements and a transmissive region for transmitting external light.

20. The display device according to claim 1, wherein the first substrate includes a first glass substrate and the second substrate includes a second glass substrate.

Images