Display device

Abstract

A display device includes: a display panel; a circuit board disposed on a lower surface of the display panel; and an adhesive layer disposed between the circuit board and the lower surface of the display panel. A region of the circuit board having a roughness greater than a predetermined reference roughness does not overlap with the adhesive layer.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and all the benefits of Korean Patent Application No. 10-2019-0016095, filed on Feb. 12, 2019, which is hereby incorporated by reference in its entirety. Technical Field

[0003] Embodiments of the present invention relate to a display device, and more particularly, to a display device capable of substantially minimizing image quality degradation. Background Art

[0004] A flat panel display device, such as a liquid crystal display ("LCD") device or an organic light emitting diode ("OLED") display device, includes a plurality of pairs of electrodes for generating an electric field and an electro-optical active layer interposed therebetween. The LCD device includes a liquid crystal layer as the electro-optical active layer, while the OLED display device includes an organic light emitting layer as the electro-optical active layer.

[0005] In a flat panel display device, one electrode of a pair of electrodes generating an electric field is connected to a switching element to receive an electric signal, and the electro-optical active layer converts the electric signal into an optical signal to display an image. Summary of the invention

[0006] One or more embodiments of the present invention are directed to a display device capable of substantially minimizing degradation of image quality.

[0007] According to an embodiment, a display device may include: a display panel; a circuit board arranged on a lower surface of the display panel; and an adhesive layer arranged between the circuit board and the lower surface of the display panel, wherein an area of ​​the circuit board having a roughness greater than a predetermined baseline roughness may not overlap with the adhesive layer.

[0008] The circuit board may include a plurality of signal lines, and a density of the plurality of signal lines disposed at the region of the circuit board may be greater than a predetermined reference density.

[0009] The circuit board may include a plurality of signal lines, and a pitch of the plurality of signal lines disposed at the region of the circuit board may be smaller than a predetermined reference pitch.

[0010] The circuit board may be electrically connected to one edge of the display panel.

[0011] The circuit board may be electrically connected to one edge of an upper surface of the display panel.

[0012] The adhesive layer may have a hole overlapping the region.

[0013] The hole may surround the region.

[0014] The region may include a plurality of regions separated from each other, and the adhesive layer may have a plurality of holes respectively overlapping the plurality of regions.

[0015] The plurality of holes may surround the plurality of regions, respectively.

[0016] The region may include a plurality of regions separated from each other, and the adhesive layer may have holes overlapping the plurality of regions.

[0017] The hole may surround the plurality of regions.

[0018] The hole may have substantially the same shape as that of the region.

[0019] The hole may have a shape different from the shape of the area.

[0020] The holes may have a circular, oval, rectangular or square shape.

[0021] The aperture may have a plan area that is at least twice greater than a plan area of ​​the region.

[0022] The display device may further include a driving unit disposed on the circuit board.

[0023] A display device may include: a display panel; a circuit board including a first area having a first roughness and a second area different from the first area and having a second roughness, the first roughness being greater than the second roughness; and an adhesive layer located between the circuit board and the display panel and attaching the circuit board to the display panel, wherein an outer edge of the adhesive layer may be spaced apart from the first area of ​​the circuit board.

[0024] The adhesive layer may have a recess corresponding to the first region of the circuit board, and the recess of the adhesive layer may be opened toward the driving unit on the circuit board in a plan view.

[0025] The display panel may be flexible, the circuit board may be electrically connected to the display panel at the upper surface of the display panel, the curved display panel may have the adhesive layer disposed between the circuit board and a lower surface of the display panel relative to the upper surface of the display panel to attach the circuit board to the display panel at the lower surface of the display panel, and the outer edge of the adhesive layer disposed between the circuit board and the lower surface of the display panel may be spaced apart from the first area of ​​the circuit board.

[0026] The display device may further include a driving unit, which is disposed on the circuit board, and an electrical signal from the driving unit is transmitted to the display panel through the circuit board, wherein the curved display panel further disposes the driving unit to face the lower surface of the display panel, wherein, in a plan view, the first area of ​​the circuit board may be located between the adhesive layer and the driving unit.

[0027] The foregoing is illustrative only and is not intended to be limiting in any way. In addition to the illustrative embodiments and features described above, further embodiments and features will become apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] A more complete understanding of the present invention will become more apparent by describing in detail embodiments of the present invention with reference to the accompanying drawings, in which:

[0029] Figure 1 is a plan view showing an embodiment of a display device;

[0030] Figure 2 is along Figure 1 A cross-sectional view taken along line II' in FIG.

[0031] Figure 3 It is shown Figure 1 A plan view of an embodiment of a driving circuit in;

[0032] Figure 4 yes Figure 3 An enlarged plan view of a portion A in FIG.

[0033] Figure 5 is shown relative to Figure 1 A plan view of an embodiment of a second adhesive layer of a driving circuit in FIG.

[0034] Figure 6 is a plan view showing another embodiment of the second adhesive layer;

[0035] Figure 7 is a plan view showing still another embodiment of the second adhesive layer;

[0036] Figure 8 is a plan view showing a modified example of the second adhesive layer; and

[0037] Fig. 9 is a plan view showing still another example of the second adhesive layer. DETAILED DESCRIPTION

[0038] Embodiments will now be described more fully below with reference to the accompanying drawings. Although the present invention can be modified in different ways and has several embodiments, embodiments are shown in the drawings and will be primarily described in the specification. However, the scope of the present invention is not limited to these embodiments, and should be understood to include all changes, equivalents and substitutions included within the spirit and scope of the present invention.

[0039] In the accompanying drawings, the thickness of multiple layers and regions is shown in an enlarged manner for clarity and ease of description. When a layer, region or plate is referred to as being associated with another element, such as "on" or "under" another layer, region or plate, it can be directly on another layer, region or plate, or there can be an intermediate layer, intermediate region or intermediate plate between them. Conversely, when a layer, region or plate is referred to as being associated with another element, such as "directly on" or "directly under" another layer, region or plate, there is no intermediate layer, intermediate region or intermediate plate therebetween.

[0040] For ease of illustration, spatially relative terms such as "under," "below," "below," "above," and "on" may be used herein to describe the relationship of one element or component to another element or component as shown in the accompanying drawings. It will be understood that the spatially relative terms are intended to cover different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, where the device shown in the accompanying drawings is flipped, a device positioned "under" or "below" another device may be placed "above" the other device. Thus, the illustrative term "under" may include an upper position and a lower position. The device may also be positioned in other directions, and therefore, the spatially relative terms may be interpreted differently depending on the orientation.

[0041] Throughout the specification, when an element is referred to as being “connected” to another element, the element is “physically in contact” with the other element, such as being in direct contact with the other element, or being “electrically connected” to the other element with one or more intermediate elements interposed therebetween.

[0042] The terms used herein are only for the purpose of describing specific embodiments, and are not intended to be limited. As used herein, unless the context clearly indicates otherwise, the singular forms "one", "a kind of" and "said" are intended to include plural forms, including "at least one". "At least one (kind)" is not interpreted as being limited to "one" or "a kind". "Or" means "and / or". As used herein, the term "and / or" includes any combination and all combinations of one or more related listed items. It will also be understood that when used in this specification, the terms "include", "comprise", "contain", and / or "have" illustrate the presence of stated features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their groups.

[0043] It will be understood that although the terms "first", "second", "third", etc. may be used to describe various elements in this article, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, without departing from the teachings of this article, the "first element" described below may be referred to as the "second element" or the "third element", and the "second element" and the "third element" may be named similarly.

[0044] As used herein, "about" or "approximately" includes the stated value and means within an acceptable range of deviation of the particular value determined by one of ordinary skill in the art, taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, or ±5% of the stated value.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art. It will also be understood that, unless explicitly defined in this specification, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formalized meaning.

[0046] Some parts that are not related to the description may not be provided in order to specifically describe certain embodiments, and the same reference numerals refer to the same elements throughout the specification.

[0047] In the following, reference will be made to Figures 1 to 9 A display device is described in detail.

[0048] Figure 1 is a plan view showing an embodiment of a display device, and Figure 2is along Figure 1 A cross-sectional view taken along line II'. Figure 1 A view of a lower surface (eg, rear side) of a display device is shown.

[0049] like Figure 1 and Figure 2 As shown, the display device may include a display panel 400, a first adhesive layer 411 (see Figure 2 ), the window 100 (eg, the window layer 100), the driving circuit 530 and the second adhesive layer 700. The driving circuit 530, the second adhesive layer 700, the display panel 400, the first adhesive layer 411 and the window 100 may be arranged along the Z-axis direction, for example, the thickness direction. Figure 1 and Figure 2 The display device in FIG. 4 is bent to position the end of the display panel 400 and components attached thereto on the rear side of the display device (eg, opposite the front or viewing side thereof).

[0050] The display panel 400 generates and / or displays an image. The display panel 400 may be bendable or foldable to have a curved shape. In an embodiment, for example, the curved or folded display panel 400 is configured such that a portion of the display panel 400 is disposed to face the lower surface 401a of the display panel 400 (see Figure 2 ).

[0051] like Figure 2 As shown, the display panel 400 may include a display element unit 450 (eg, a display element layer 450 ), a touch sensing unit 407 (eg, a touch sensing layer 407 ), and a polarizing plate 409 .

[0052] The display element unit 450 may include a first substrate 401, a display layer 403, and a second substrate 402. The display layer 403 may be disposed on the first substrate 401, and the second substrate 402 may be disposed on the display layer 403 and the first substrate 401. In such an embodiment, the display layer 403 may be disposed between the first substrate 401 and the second substrate 402.

[0053] The first substrate 401 may be bendable or foldable to have a curved shape. In an embodiment, for example, the first substrate 401 that is bent or folded sets a portion of the first substrate 401 to face the lower surface 401a of the first substrate 401, and the lower surface 401a of the first substrate 401 defines the lower surface 401a of the display panel 400.

[0054] The display layer 403 may include an organic light emitting element. In addition to the organic light emitting element, any of the multiple elements used to display an image and / or emit light in the display device may constitute the display layer 403. In an embodiment, for example, the display layer 403 may include liquid crystal instead of the above-mentioned organic light emitting element. In other words, the display device according to one or more embodiments may be an OLED display device including an organic light emitting element or an LCD device including a liquid crystal.

[0055] The second substrate 402 is positioned opposite to the first substrate 401. The second substrate 402 may be attached to the first substrate 401 by a sealant (not shown). The second substrate 402 protects the display layer 403. As a material for the second substrate 402, a glass substrate or a transparent synthetic resin film including, for example, acrylic may be used. In addition, a metal plate may be used as a material for the second substrate 402. In an embodiment, for example, the second substrate 402 may include at least one of a polyethylene (PET) film, a polypropylene ("PP") film, a polyamide ("PA") film, a polyacetal ("POM") film, a polymethyl methacrylate ("PMMA") film, a polybutylene terephthalate ("PBT") film, a polycarbonate ("PC") film, a cellulose film, and a moisture-proof glass paper.

[0056] The second substrate 402 may have a planar area smaller than that of the first substrate 401. The planar area may be defined by the product of the dimensions along the first direction and the second direction intersecting each other. Figure 2 , the X-axis direction and the Y-axis direction may represent the first direction and the second direction differently, but are not limited thereto. Therefore, a partial plane area (e.g., a pad area) of the first substrate 401 may be exposed to the outside of the second substrate 402 without being covered by the second substrate 402. In an embodiment, the second substrate 402 may be a sealing member and may have a thin film structure in which an organic film and an inorganic film are alternately stacked.

[0057] The touch sensing unit 407 may be disposed on the second substrate 402. The touch sensing unit 407 may correspond to the display area of ​​the first substrate 401, and the display panel 400 displays an image in the display area. Although not shown, the touch sensing unit 407 may include a plurality of first electrodes and a plurality of second electrodes that cross each other. The first electrode and the second electrode may include a touch sensor pattern. In an embodiment, the first electrode and the second electrode may be directly disposed on the second substrate 402 in a matrix form (e.g., in an external hanging method) or directly patterned on the second substrate 402. When the second substrate 402 is used as a sealing member, this external hanging method may be applied. In an embodiment, for example, when the display device is an OLED display device, the second substrate 402 may be used as a sealing member.

[0058] In an embodiment, the touch sensing unit 407 may be a touch panel that is manufactured or provided separately from the display panel 400, and is then disposed on the display panel 400. In such an embodiment, the touch sensing unit 407 may be disposed on the second substrate 402. When a pattern is already disposed on one surface of the second substrate 402, such a method of separately manufacturing a touch panel may be applied. In an embodiment, for example, when the display device is an LCD device, patterns such as a black matrix and a color filter may already be disposed on one surface of the second substrate 402, and the touch sensing unit 407 may be subsequently disposed on the second substrate 402.

[0059] The touch sensing unit 407 recognizes a touch as an input from outside the touch sensing unit 407 by an input tool or a touch device (e.g., a pen or a user's body part such as a finger), and transmits a signal corresponding to the position of the touch input to a touch controller (not shown) of the display device. The touch sensing unit 407 can be used as an input device of the display device. The touch sensing unit 407 can recognize a touch in a resistive manner or a capacitive manner.

[0060] The polarizing plate 409 may be disposed on the touch sensing unit 407. In an embodiment, for example, the polarizing plate 409 may be disposed between the touch sensing unit 407 and the first adhesive layer 411. The polarizing plate 409 may substantially reduce or effectively prevent reflection of external light incident thereon from outside the display device.

[0061] The first adhesive layer 411 may be disposed between the display panel 400 and the window 100. In an embodiment, for example, the first adhesive layer 411 may be disposed between the polarizing plate 409 of the display panel 400 and the window 100. The first adhesive layer 411 may attach the display panel 400 and the window 100 to each other. In addition, the first adhesive layer 411 may improve the brightness, transmittance, reflectivity, and visibility of the display device. The first adhesive layer 411 may include a resin. The resin may be a photocurable resin.

[0062] The window 100 may be disposed on the first adhesive layer 411 so as to overlap with the display panel 400. The window 100 may include a light-transmitting area overlapping with a display area of ​​the display panel 400 displaying an image, and a light-shielding area overlapping with a non-display area of ​​the display panel 400 not displaying an image. The window 100 may be used for its outer surface on the viewing side of the display device, but is not limited thereto. A light-shielding portion 222 may be provided in the light-shielding area of ​​the window 100. In an embodiment, for example, a light-shielding portion 222 may be provided along an edge or edge portion of the lower surface of the window 100. In such an embodiment, in a top view, the light-transmitting area of ​​the window 100 is surrounded by the light-shielding portion 222. The window 100 may include a transparent material such as a glass material.

[0063] The driving circuit 530 drives the display panel 400. The driving circuit 530 may be connected to the display panel 400. In an embodiment, for example, the driving circuit 530 may be electrically connected to the first substrate 401 of the display panel 400. As a more specific example, the driving circuit 530 may be electrically connected to the upper surface 401b of the first substrate 401 opposite to the lower surface 401a of the first substrate 401.

[0064] The driving circuit 530 may include a circuit board 300 and a driving unit 500 (eg, a driver or a driving member).

[0065] The circuit board 300 may be electrically connected to the first substrate 401 of the display panel 400. The circuit board 300 may be a film including a plurality of signal lines through which various electrical signals (e.g., driving signals, control signals, power signals, gate signals, data signals, etc.) are transmitted from the driving unit 500 to the display panel 400. In such an embodiment, the film may be a bendable film, for example, a flexible film.

[0066] The driving unit 500 drives the display panel 400. In an embodiment, for example, the driving unit 500 may provide an electrical signal (e.g., a gate signal and a data signal) to the display panel 400 to drive the gate line and the data line of the first substrate 401, respectively. The driving unit 500 is disposed on the circuit board 300. In an embodiment, for example, the driving unit 500 may be mounted on a mounting area of ​​the circuit board 300. The driving unit 500 may include an integrated circuit. The driving unit 500 may have a bar shape in a top view, and the bar shape defines a length of the driving unit 500 extending along the X-axis direction.

[0067] The second adhesive layer 700 may be disposed on the lower surface 401a of the display panel 400. In an embodiment, for example, the second adhesive layer 700 may be disposed on the lower surface 401a of the first substrate 401 of the display panel 400. As a more specific example, the second adhesive layer 700 may be disposed between the driving circuit 530 and the display panel 400. In an embodiment, for example, the second adhesive layer 700 may be disposed between the circuit board 300 and the lower surface 401a of the first substrate 401. The second adhesive layer 700 may be, for example, a pressure sensitive adhesive ("PSA").

[0068] The second adhesive layer 700 overlaps with the display area of ​​the display panel 400 (e.g., corresponds to the display area of ​​the display panel 400). The circuit board 300 may be attached to the lower surface 401a of the first substrate 401 through the second adhesive layer 700. The curved display panel 400 disposes the second adhesive layer 700 between the circuit board 300 and the lower surface 401a of the display panel 400 to attach the circuit board 300 to the display panel 400 at the lower surface 401a of the display panel 400. In such an embodiment, the second adhesive layer 700 does not overlap with a certain area of ​​the circuit board 300, which will be referred to as Figure 3 Detailed description.

[0069] Figure 3 It is shown Figure 1 A plan view of an embodiment of a driving circuit 530, Figure 4 yes Figure 3 an enlarged plan view of section A in FIG. 1 , and Figure 5 is shown relative to Figure 1 FIG. 5 is a plan view of an embodiment of a second adhesive layer 700 of a driving circuit 530 .

[0070] like Figure 3 As shown in , the circuit board 300 of the driving circuit 530 may include a plurality of signal lines 600 .

[0071] The driving unit 500 of the driving circuit 530 is disposed in the mounting area of ​​the circuit board 300. The mounting area of ​​the circuit board 300 may be located in the central portion of the circuit board 300.

[0072] The plurality of signal lines 600 may include a first signal line 601 provided in plurality (eg, a plurality of first signal lines 601 ) and a second signal line 602 provided in plurality (eg, a plurality of second signal lines 602 ).

[0073] The plurality of first signal lines 601 and the plurality of second signal lines 602 are connected to the driving unit 500. In an embodiment, for example, the plurality of first signal lines 601 may be connected to the plurality of first terminals of the driving unit 500, and the plurality of second signal lines 602 may be connected to the plurality of second terminals of the driving unit 500, respectively.

[0074] The first end portion of each of the plurality of first signal lines 601 may be disposed at the first pad region of the circuit board 300. Figure 3 For example, such a first end of the first signal line 601 may have a planar area greater than a planar area of ​​another portion of the first signal line 601 (eg, the remainder of the first signal line 601 and / or a portion of the first signal line 601 adjacent to the first end).

[0075] The first end of each of the plurality of second signal lines 602 may be disposed at the second pad region of the circuit board 300. Such second end of the second signal line 602 may have a planar area greater than a planar area of ​​another portion of the second signal line 602 (e.g., the remaining portion of the second signal line 602 and / or a portion of the second signal line 602 adjacent to the first end). The first end of the second signal line 602 and the first end of the first signal line 601 face each other along the Y-axis direction.

[0076] Although not shown, the first end of each of the plurality of first signal lines 601 may be connected to another circuit board (e.g., a printed circuit board). Another drive unit (hereinafter referred to as a "second drive unit") may be provided on the printed circuit board. The electrical signal from the second drive unit may be applied to the drive unit 500 through the first signal line 601.

[0077] In an embodiment, the interval between the signal lines 600 arranged at a specific area (e.g., area a1 and a2) of the circuit board 300 may be less than a predetermined reference interval. In such an embodiment, the interval between the signal lines 600 may be defined as a line spacing. The line spacing of a specific area being less than the predetermined reference spacing means that the interval between the signal lines 600 adjacent to each other and arranged at the specific area is less than the reference interval.

[0078] In an embodiment, for example, Figure 4 Each of the line spacings P1 in the first area a1 and the second area a2 in the first area a1 may be smaller than the aforementioned reference spacing. Therefore, the density of the first signal lines 601 in the first area a1 and the density of the first signal lines 601 in the second area a2 are both greater than the reference density. Therefore, the roughness (e.g., surface roughness) in the first area a1 and the roughness in the second area a2 are both greater than a predetermined reference roughness. In such an embodiment, the reference roughness may be, for example, substantially equal to or greater than approximately 0.2a (i.e., 0.2Ra) micrometers (μm) and substantially equal to or less than approximately 6.3a (i.e., 6.3Ra) micrometers (μm).

[0079] Therefore, more wrinkles are generated at the first area a1 and the second area a2 of the circuit board 300 than at other areas of the circuit board 300. Since more wrinkles are generated at the first area a1 and the second area a2 of the circuit board 300 due to the increased density of the signal line 600, if the second adhesive layer 700 is disposed at the first area a1 and the second area a2, the surface of the second adhesive layer 700 contacting the first area a1 and the second area a2 may be wrinkled.

[0080] When the surface of the second adhesive layer 700 in contact with the first area a1 and the second area a2 is wrinkled, the surface of the first substrate 401 in contact with the second adhesive layer 700 is also wrinkled. Since the second adhesive layer 700 corresponds to the display area of ​​the display panel 400, the wrinkles of the first substrate 401 may affect the image on the display area. In an embodiment, for example, due to the wrinkles in the first substrate 401, the image visible at the display area from outside the display device may be distorted. To solve this problem, in one or more embodiments, as shown in FIG. Figure 5 As shown, the second adhesive layer 700 does not overlap the first area a1 and the second area a2. Therefore, the wrinkles of the circuit board 300 will not propagate to the display area of ​​the display panel 400, thereby improving the display quality of the image in the display area.

[0081] Reference Figure 5 , the second adhesive layer 700 may have an overall rectangular shape in a plan view. A notch may be defined on one side of the second adhesive layer 700. The notch may be open in a direction toward the first area a1 and the second area a2, so that the second adhesive layer 700 does not correspond to the first area a1 and the second area a2. That is, the outer edge of the second adhesive layer 700 at the notch may be adjacent to or spaced apart from the boundary of the first area a1 and the second area a2, so that the second adhesive layer 700 does not correspond to (e.g., overlap) the first area a1 and the second area a2.

[0082] In an embodiment, Figure 4 As shown, each of the line spacing P2 in the third area a3 of the circuit board 300, the line spacing P2 in the fourth area a4 of the circuit board 300, and the line spacing P2 in the fifth area a5 of the circuit board 300 can be greater than the above-mentioned reference spacing. Therefore, since the density of the first signal line 601 in the third area a3, the fourth area a4, and the fifth area a5 of the circuit board 300 is less than the reference density, the roughness in each of the third area a3, the fourth area a4, and the fifth area a5 is less than the above-mentioned reference roughness. That is, the first area a1 and the second area a2 (for example, collectively referred to as the "first area") have a first roughness, and the third area a3, the fourth area a4, and the fifth area a5 (for example, collectively referred to as the "second area different from the first area") have a second roughness, and the first roughness is greater than the second roughness.

[0083] When the surface of the second adhesive layer 700 contacts the third area a3, the fourth area a4, and / or the fifth area a5, each of which has a roughness lower than the above-mentioned reference roughness, the second adhesive layer 700 may not be wrinkled, and thus, the surface of the first substrate 401 in contact with the second adhesive layer 700 may not be wrinkled. Therefore, wrinkles are substantially not generated in the third area a3, the fourth area a4, and the fifth area a5, and an image visible at the display area from the outside of the display device is not distorted due to the wrinkles in the first substrate 401.

[0084] In an embodiment, in addition to the first area a1 and the second area a2, the recess in the second adhesive layer 700 may correspond to one or more of the third area a3, the fourth area a4, and the fifth area a5. In another embodiment, portions of the second adhesive layer 700 may correspond to one or more of the third area a3, the fourth area a4, and the fifth area a5, but not to the first area a1 and the second area a2.

[0085] Although Figure 5 The first area a1 and the second area a2 in the plan view are shown to have a straight line shape, but the present invention is not limited thereto. In an embodiment, although not shown, at least one of the first area a1 and the second area a2 may have a circular shape or an elliptical shape in a plan view.

[0086] Figure 6 is a plan view showing another embodiment of the second adhesive layer 700 .

[0087] like Figure 6 As shown, the second adhesive layer 700 may have a first hole 71 and a second hole 72 defined therein. The first hole 71 and the second hole 72 may be defined through the second adhesive layer 700 along the Z-axis direction.

[0088] The first hole 71 may be positioned corresponding to the first area a1 of the circuit board 300 described above. The first hole 71 may overlap the first area a1. In such an embodiment, the first hole 71 may surround the first area a1. In an embodiment, for example, the first hole 71 may have a closed shape (or a closed loop shape) surrounding the first area a1. The first hole 71 may have a planar area substantially equal to or greater than the planar area of ​​the first area a1. Figure 6 , for example, the planar shape of the first area a1 is completely within the closed planar shape of the first hole 71 , so that the first hole 71 surrounds the first area a1 .

[0089] The second hole 72 may be positioned corresponding to the second area a2 of the circuit board 300 described above. The second hole 72 may overlap the second area a2. In such an embodiment, the second hole 72 may surround the second area a2. In an embodiment, for example, the second hole 72 may have a closed shape surrounding the second area a2. The second hole 72 may have a planar area substantially equal to or greater than the planar area of ​​the second area a2.

[0090] Each of the first hole 71 and the second hole 72 may have a circular shape in a plan view. In addition, although not shown, each of the first hole 71 and the second hole 72 may have an elliptical shape in a plan view. The first hole 71 and the second hole 72 may each be a discrete opening defined by several portions of the second adhesive layer 700.

[0091] Figure 7 is a plan view showing still another embodiment of the second adhesive layer 700 .

[0092] like Figure 7 As shown, the second adhesive layer 700 may have a hole 73 defined therein. The hole 73 may be defined through the second adhesive layer 700 along the Z-axis direction.

[0093] The hole 73 may be a discrete opening defined by several portions of the second adhesive layer 700. The hole 73 as a single discrete opening may be positioned corresponding to each of the first area a1 and the second area a2 of the circuit board 300 described above. The hole 73 overlaps each of the first area a1 and the second area a2. In such an embodiment, the hole 73 may surround the first area a1 and the second area a2. In an embodiment, for example, the same hole 73 may have a closed shape that surrounds both the first area a1 and the second area a2. The hole 73 may have a planar area greater than the total planar area of ​​the first area a1 and the second area a2.

[0094] The hole 73 may have a quadrilateral shape (eg, a rectangular shape). In addition, although not shown, the hole 73 may have a square shape. In such an embodiment, the hole 73 may have a shape substantially the same as that of the first area a1 or the second area a2.

[0095] Figure 8 is a plan view showing a modified example of the second adhesive layer 700 .

[0096] like Figure 8 As shown, the second adhesive layer 700 may have a hole 74 defined therein. The hole 74 may be defined through the second adhesive layer 700 along the Z-axis direction.

[0097] The hole 74 may be a discrete opening defined by several portions of the second adhesive layer 700. The hole 74 as a single discrete opening may be positioned corresponding to each of the first area a1 and the second area a2 of the circuit board 300 described above. The hole 74 overlaps each of the first area a1 and the second area a2. In such an embodiment, the hole 74 may surround the first area a1 and the second area a2. In an embodiment, for example, the same hole 74 may have a closed shape that surrounds both the first area a1 and the second area a2. The hole 74 may have a planar area greater than the total planar area of ​​the first area a1 and the second area a2.

[0098] The hole 74 may have an elliptical shape. In addition, although not shown, the hole 74 may have a circular shape. Figure 8 , the hole 74 defined in the second adhesive layer 700 has a shape different from that of the first area a1.

[0099] Fig. 9 is a plan view showing still another embodiment of the second adhesive layer 700 .

[0100] like Fig. 9 As shown, the second adhesive layer 700 may have a first hole 75 and a second hole 76 defined in the second adhesive layer 700. The first hole 75 and the second hole 76 may be defined through the second adhesive layer 700 along the Z-axis direction. The first hole 75 and the second hole 76 may each be a discrete opening defined by portions of the second adhesive layer 700.

[0101] The first hole 75 may be positioned corresponding to the first area a1 of the circuit board 300 described above. The first hole 75 may overlap the first area a1. In such an embodiment, the first hole 75 may surround the first area a1. In an embodiment, for example, the first hole 75 may have a closed shape surrounding the first area a1. The first hole 75 may have a planar area greater than the planar area of ​​the first area a1. In an embodiment, for example, the first hole 75 may have a planar area greater than twice the planar area of ​​the first area a1.

[0102] The second hole 76 may be positioned corresponding to the second area a2 of the circuit board 300 described above. The second hole 76 may overlap with the second area a2. In such an embodiment, the second hole 76 may surround the second area a2. In an embodiment, for example, the second hole 76 may have a closed shape surrounding the second area a2. The second hole 76 may have a planar area greater than the planar area of ​​the second area a2. In an embodiment, for example, the second hole 76 may have a planar area greater than twice the planar area of ​​the second area a2.

[0103] Each of the first hole 75 and the second hole 76 may have a square shape. In another embodiment, although not shown, each of the first hole 75 and the second hole 76 may have a quadrilateral shape (e.g., a rectangular shape). In such an embodiment, the first hole 75 may have a shape substantially the same as that of the first area a1, and the second hole 76 may have a shape substantially the same as that of the second area a2.

[0104] As described above, the display device according to one or more embodiments may substantially minimize image quality degradation.

[0105] While the invention has been shown and described with reference to embodiments thereof, it will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. A display device, wherein: The display device comprises: Display panel; a circuit board disposed on a lower surface of the display panel; and an adhesive layer disposed between the circuit board and the lower surface of the display panel, the adhesive layer overlapping the display area of ​​the display panel, Wherein, a region of the circuit board having a roughness greater than a predetermined reference roughness does not overlap with the adhesive layer.

2. The display device according to claim 1, wherein: The circuit board includes a plurality of signal lines, and The density of the plurality of signal lines arranged at the area of ​​the circuit board is greater than a predetermined reference density.

3. The display device according to claim 1, wherein: The circuit board includes a plurality of signal lines, and A pitch of the plurality of signal lines disposed at the region of the circuit board is smaller than a predetermined reference pitch.

4. The display device according to claim 1, wherein: The circuit board is electrically connected to one edge of the display panel.

5. The display device according to claim 1, wherein: The adhesive layer has a hole overlapping the area.

6. The display device according to claim 1, wherein: The region includes a plurality of regions separated from each other, and The adhesive layer has a plurality of holes respectively overlapping the plurality of regions.

7. The display device according to claim 1, wherein: The region includes a plurality of regions separated from each other, and The adhesive layer has holes overlapping the plurality of regions. 8 . The display device according to claim 1 , further comprising a driving unit disposed on the circuit board.

9. The display device according to any one of claims 5 to 7, wherein: The hole has the same shape as that of the area.

10. The display device according to any one of claims 5 to 7, wherein: The hole has a shape different from a shape of the region.

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