Display device

Abstract

The present application relates to a display device. The invention describes a display having a base layer and a buffer layer having two exposed portions on top of the base layer. The exposed portions are covered with a film. A pixel layer is placed between the two films and a first substrate is attached to the pixel layer using an adhesive layer. The substrate is designed using multiple thicknesses or slots to help the radius of curvature of the end portions of the display to achieve a zero bezel display.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 201811178547.5 entitled “Display apparatus” and filed on October 10, 2018, which claims priority under Paris Convention to Korean Patent Application No. 10-2017-0143918 filed on October 31, 2017.

[0002] Cross Reference to Related Applications

[0003] This application claims the benefit of Korean Patent Application No. 10-2017-0143918, filed on October 31, 2017, the entire contents of which are incorporated herein by reference for all purposes as if fully set forth herein. TECHNICAL FIELD

[0004] The present disclosure relates to a display apparatus. BACKGROUND

[0005] As the information age advances, the demand for display apparatuses for displaying images has increased in various forms. Recently, display apparatuses of a more slim size have been introduced. In particular, a flexible display apparatus has many advantages, including that it is easy to carry and has various shaped apparatuses.

[0006] Since the flexible display apparatus includes a bending area in which a substrate can be folded, and the bezel size can be reduced by folding the substrate at the bending area, the flexible display apparatus can be implemented as a display apparatus having a narrow bezel.

[0007] However, as the bending level increases to have a narrower bezel, stress on the panel edge increases and stress within the panel becomes strong, resulting in problems such as light emitting diode layer stacking and thin film transistor short circuit. SUMMARY

[0008] Accordingly, the present disclosure relates to a display apparatus substantially obviating one or more problems due to limitations and disadvantages of the related art.

[0009] An advantage of the present disclosure is to provide a display apparatus that can have a zero bezel by facilitating bending.

[0010] Additional advantages and features of the disclosure will be set forth in part in the description which follows, and in part will become apparent to those having ordinary skill in the art upon examination of the following or can be learned from practice of the disclosure. The objectives and other advantages of the disclosure can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0011] To achieve these and other advantages and in accordance with the purposes of this disclosure, as embodied and broadly described herein, a display device is provided, comprising: a first substrate having a display area and a non-display area surrounding the display area; a pixel array layer disposed on the display area of ​​the first substrate; and a second substrate disposed on the pixel array layer, the second substrate having a first region and a second region bent from the first region, wherein the second substrate has different thicknesses in the first region and the second region.

[0012] It should be understood that the above general description and the following detailed description of this disclosure are exemplary and illustrative, and are intended to provide further explanation of the claimed disclosure. Attached Figure Description

[0013] The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention. The drawings illustrate embodiments of the present disclosure and, together with the description, serve to illustrate the principles of the disclosure. In the drawings:

[0014] Figure 1 This is a plan view showing a display device in an unbent state according to one embodiment of the present disclosure;

[0015] Figure 2 This illustrates a display device according to a first embodiment of the present disclosure. Figure 1 A cross-sectional view taken from the I-I' line;

[0016] Figure 3 It is shown Figure 2 A cross-sectional view of the display device in a bent state, as shown;

[0017] Figure 4 This illustrates a display device along a second embodiment of the present disclosure. Figure 1 A cross-sectional view taken from the I-I' line;

[0018] Figure 5 This illustrates a display device according to a third embodiment of the present disclosure. Figure 1 A cross-sectional view taken from the I-I' line;

[0019] Figure 6 This illustrates a display device according to a fourth embodiment of the present disclosure. Figure 1 A cross-sectional view taken from the I-I' line;

[0020] Figure 7 This illustrates a display device according to a fifth embodiment of the present disclosure. Figure 1 A cross-sectional view taken from the I-I' line;

[0021] Figure 8 This illustrates a display device according to a sixth embodiment of the present disclosure.Figure 1 A cross-sectional view taken from the I-I' line;

[0022] Figure 9 This illustrates a display device according to a seventh embodiment of the present disclosure. Figure 1 A cross-sectional view taken from the I-I' line; Detailed Implementation Plan

[0023] The advantages and features of this disclosure, as well as its implementation, will be illustrated by the following embodiments described with reference to the accompanying drawings. However, this disclosure may be implemented in various forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art. Furthermore, this disclosure is limited only by the scope of the claims.

[0024] The shapes, dimensions, ratios, angles, and numbers disclosed in the accompanying drawings to describe embodiments of this disclosure are merely examples, and therefore this disclosure is not limited to the details shown. Throughout the specification, similar reference numerals indicate similar elements. In the following description, detailed descriptions identifying relevant known functions or configurations will be omitted where such omissions unnecessarily obscure the focus of this disclosure.

[0025] When using the terms "comprising," "having," and "including" as described in this specification, another component may be added unless "only" is used. Unless otherwise specified, singular terms may include plural terms.

[0026] When interpreting elements, even if not explicitly stated, elements are interpreted as including a range of error.

[0027] When describing positional relationships, such as when the positional relationship is described as "on," "above," "below," and "next to," one or more parts may be arranged between two other parts unless "immediately following" or "directly" is used.

[0028] When describing temporal relationships, such as when time sequence is described as “after,” “following,” “then,” and “before,” discontinuous cases may be included unless “exactly” or “directly” is used.

[0029] It should be understood that although the terms "first," "second," etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, a first element may be referred to as a second element without departing from the scope of this disclosure, and similarly, a second element may be referred to as a first element.

[0030] The “first horizontal axis direction,” “second horizontal axis direction,” and “vertical axis direction” should not be interpreted solely by their geometric relationship of being perpendicular to each other, but can have a wider range of directions within the scope of the functionality of this disclosure.

[0031] The term "at least one" should be understood as any and all combinations including one or more associated enumerated items. For example, "at least one of the first, second, and third items" means a combination of all items drawn from two or more of the first, second, and third items, as well as the first, second, or third item.

[0032] As will be fully understood by those skilled in the art, the features of the various embodiments of this disclosure may be coupled or combined with each other in part or in whole, and may cooperate with each other and be technically driven in various ways. The embodiments of this disclosure may be implemented independently of each other, or may be implemented together in an interdependent relationship.

[0033] In the following description, preferred embodiments of the present disclosure will be illustrated with reference to the accompanying drawings. Where possible, the same reference numerals will be used throughout the drawings to refer to the same or similar parts.

[0034] Figure 1 This is a plan view showing a display device according to one embodiment of the present disclosure in an unbent state, and Figure 2 This illustrates a display device according to a first embodiment of the present disclosure. Figure 1 A cross-sectional view taken from the I-I' line;

[0035] Reference Figure 1 and Figure 2 The display device according to a first embodiment of the present invention includes a substrate 100, a pixel array layer 120, a second substrate 140, and a cover layer 150.

[0036] The first substrate 100 is a flexible substrate serving as a base substrate. For example, the first substrate 100 may include a transparent polyimide material. The first substrate 100 made of polyimide material may be a cured polyimide resin coated with a release layer of constant thickness on the front surface of a release layer disposed on a carrier glass substrate. The carrier glass substrate is separated from the first substrate 100 by releasing the release layer using a laser release process.

[0037] The substrate 100 includes a display area DA and a non-display area NA.

[0038] The display area DA is the area in which an image is displayed, and can be defined in the middle portion of the first substrate 100. The display area DA can be defined as the area in which a pixel array layer 120 for displaying images is arranged.

[0039] The non-display area NA is the area in which no image is displayed, and can be defined as the edge portion of the substrate 100 surrounding the display area DA.

[0040] A buffer layer 110 may be formed on the first substrate 100. The buffer layer 110 is formed on the entire surface of the first substrate 100 to prevent water from penetrating through the first substrate 100 into the display area DA. According to one embodiment, the buffer layer 110 may be made of a plurality of alternately deposited inorganic films. For example, the buffer layer 110 may be formed of a multilayer film of one or more inorganic films, such as silicon oxide film (SiOx), silicon nitride film (SiNx), SiON, and SiO2, stacked alternately. The buffer layer 110 may be omitted.

[0041] The pixel array layer 120 is disposed on the display area DA of the first substrate 100. That is, the pixel array layer 120 is disposed on the buffer layer 110 that overlaps with the display area DA defined in the first substrate 100.

[0042] The pixel array layer 120 may include scan lines, data lines, driving power lines, pixel driving circuits, and a light-emitting diode layer.

[0043] The scan lines can be arranged parallel to the first direction X of the first substrate 100 and spaced apart from each other along the second direction Y of the first substrate 100.

[0044] The data lines can be arranged parallel to the second direction Y of the first substrate 100 and spaced apart from each other along the first direction X of the first substrate 100.

[0045] The power supply line and data line are arranged in parallel.

[0046] A pixel driving circuit is disposed in a pixel region defined by the intersection between scan lines and data lines, and may include at least two thin-film transistors and at least one capacitor. The pixel driving circuit drives the light-emitting diode layer to emit light according to a scan signal provided by an adjacent scan line, a drive power provided by an adjacent drive power line, and a data signal provided from the data line.

[0047] The light-emitting diode (LED) layer emits light according to a data signal provided from the pixel driving circuit of the corresponding pixel. The light emitted from the LED layer is emitted to the outside by passing through the first substrate 100. The LED layer may include a first electrode connected to the pixel driving circuit of the corresponding pixel, a light-emitting layer formed on the first electrode, and a second electrode formed on the light-emitting layer.

[0048] The first electrode can be a separately patterned anode electrode within the pixel. The first electrode is formed of a transparent metallic material that can transmit light, such as ITO and IZO.

[0049] According to one embodiment, the light-emitting layer may include a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, each of which emits light corresponding to a color set for that pixel.

[0050] According to another embodiment, the light-emitting layer can be a common layer formed together in the pixel. In this case, the manufacturing process can be simplified. The light-emitting layer can include any one of an organic light-emitting layer, an inorganic light-emitting layer, and a quantum dot light-emitting layer, or can include a deposited or hybrid structure of an organic light-emitting layer (or an inorganic light-emitting layer) and a quantum dot light-emitting layer. The light-emitting layer includes two or more light-emitting portions for emitting white light. For example, the light-emitting layer can include a first light-emitting portion and a second light-emitting portion for emitting white light by mixing a first light and a second light. In this case, the first light-emitting portion emits the first light and can include any one of a blue light-emitting portion, a green light-emitting portion, a red light-emitting portion, a yellow light-emitting portion, and a yellow-green light-emitting portion. The second light-emitting portion can include a light-emitting portion for emitting light having a complementary color to the first light having the blue light-emitting portion, green light-emitting portion, red light-emitting portion, yellow light-emitting portion, and yellow-green light-emitting portion.

[0051] The second electrode is a cathode electrode and can be a common layer formed together in the pixel. The second electrode can include a metallic material with high reflectivity. For example, the second electrode can be formed as a multilayer structure, such as a deposition structure of Al and Ti (Ti / Al / Ti), a deposition structure of Al and ITO (ITO / Al / ITO), an APC alloy (Ag / Pd / Cu), and a deposition structure of APC alloy and ITO (ITO / APC / ITO), or it can include a single-layer structure of any one material or alloy of two or more materials selected from Ag, Al, Mo, Au, Mg, Ca, or Ba.

[0052] A second substrate 140 is disposed on the pixel array layer 120 and has a first surface adjacent to the pixel array layer 120 and a second surface opposite to the first surface. The first surface of the second substrate 140 is attached to the pixel array layer 120. The second substrate 140 is primarily used to prevent oxygen or water from penetrating into the light-emitting diode layer. According to one embodiment, the second substrate 140 may be a metal foil, a metal sheet, or a metal plate. For example, the second substrate 140 may be made of an alloy material of iron and nickel with a low coefficient of thermal expansion, but is not limited thereto.

[0053] The second substrate 140 includes a first region A1 and a second region A2 that is bent from the first region.

[0054] The first region A1 is a planar region and can be defined as the region that overlaps with the front display region of the first substrate 100.

[0055] The second region A2 is a curved region and can be defined as the region that overlaps with the edge display region of the first substrate 100. The second region A2 can be a curved portion.

[0056] According to one embodiment, the second substrate 140 can be formed to have respective thicknesses in the first region A1 and the second region A2. For example, the second substrate 140 can be formed to be thicker in the first region A1 than it is thicker in the second region A2. The second substrate 140 can be formed by a partial etching process of the second region A2. For example, a process including etching and laser processing can be used to partially etch the second region A2.

[0057] Since the second substrate 140 is formed to have its own thickness in the first region A1 and the second region A2, a step difference is formed at the boundary between the first region A1 and the second region A2. For example, the step difference ranges from 40 μm to 60 μm.

[0058] The display device according to this disclosure is easily bendable because the second substrate 140 is formed with a different thickness. If the thickness of the bending region of the display device is reduced, the stress generated during bending is reduced, and homeostasis of the display panel can be maintained. In this way, if the first region A1 in the second substrate 140 is formed to be thicker than the second region, the stress applied to the display panel can be reduced, and a wide range of curvature radii can be selected, thereby reducing the bezel size of the display panel.

[0059] The first surface of the second substrate 140 is attached to the pixel array layer 120 via the adhesive layer 130. The adhesive layer 130 may be a thermosetting adhesive or a naturally curing adhesive. For example, the adhesive layer 130 may be made of a material such as a pressure-reducing adhesive or a moisture-absorbing barrier pressure-reducing adhesive.

[0060] A cover layer 150 is disposed on the non-display area NA of the first substrate 100 to adjoin the side of the second substrate 140. The cover layer 150 may be made of urethane or acrylic, comprising a polymer material. According to one embodiment, the cover layer 150 may be configured to be higher than the adhesive layer 130 in the non-display area NA adjacent to the display area DA of the first substrate 100, thereby preventing water penetration of the adhesive layer 130.

[0061] According to one embodiment, the cover layer 150 is configured to prevent the first substrate 100 from rolling up during the process of separating the carrier glass substrate from the first substrate 100 by releasing the release layer using a laser release process. Specifically, since the second substrate 140 is not disposed in the non-display area NA of the first substrate 100, the flexible and thin first substrate 100 can roll up. The cover layer 150 can be disposed on the non-display area NA of the first substrate 100 to prevent the first substrate 100 from rolling up, thereby facilitating the lamination process for forming the light-transmitting layer 160 for supporting the first substrate 100.

[0062] In addition, the display device according to this disclosure also includes a display driving circuit section 200.

[0063] The display driving circuit section 200 is connected to a pad portion disposed on a non-display area NA of the first substrate 100 to display an image corresponding to image data provided from the display driving system on each pixel. According to one embodiment, the display driving circuit section 200 includes a plurality of flexible circuit films 210, a plurality of data driving integrated circuits 220, a printed circuit board 230, and a timing controller 240.

[0064] The input terminal located on one side of each of the plurality of flexible circuit films 210 is attached to the printed circuit board 230 by means of a film attachment process, and the output terminal located on the other side of each of the plurality of flexible circuit films 210 is attached to the pad portion located on the first substrate 100 by means of a film attachment process.

[0065] Each of the plurality of data driver integrated circuits 220 is encapsulated within each of the plurality of flexible circuit films 210. Each of the plurality of data driver integrated circuits 220 receives pixel data and data control signals provided from the timing controller 240, converts the pixel data into analog pixel data according to the data control signals, and then provides the converted data to the data line.

[0066] The printed circuit board 230 is used to support the timing controller 240 and to transmit signals and power between the components of the display driving circuit section 200.

[0067] The timing controller 240 is packaged in a printed circuit board 230 and receives image data and timing synchronization signals from the display driving system via a user connector disposed in the printed circuit board 230. The timing controller 240 generates pixel data by aligning the image data to be matched with the pixel arrangement structure of the pixel array layer 120 based on the timing synchronization signals, and provides the generated pixel data to the corresponding data driver integrated circuit 220. Furthermore, the timing controller 240 generates each of a data control signal and a scan control signal based on the timing synchronization signals, controlling the driving timing of each of the plurality of data driver integrated circuits 220 via the data control signals, and controlling the driving timing of the scan driving circuit via the scan control signals. In this case, the scan control signals can be provided to the corresponding scan driving circuits via the first and / or last flexible circuit films 210 of the plurality of flexible circuit films 210.

[0068] Furthermore, the display device according to this disclosure also includes a light-transmitting layer 160 attached to the first substrate 100 to overlap with the first substrate 100.

[0069] The light-transmitting layer 160 is attached to a second surface opposite to the first surface on the first substrate 100 where the buffer layer 110 is disposed, via a transparent adhesive layer. According to one embodiment, the light-transmitting layer 160 may be made of at least one of a flexible film, such as a polyethylene terephthalate film, an antireflective film, a polarizing film, and a transmittance-controllable film. The light-transmitting layer 160 may be attached to the second surface of the first substrate 100, which is separate from the carrier glass substrate. The transparent adhesive layer may be an optically transparent resin (OCR) or an optically transparent adhesive (OCA).

[0070] Figure 3 It is shown Figure 2 The diagram shows a cross-sectional view of the display device in a bent state.

[0071] Reference Figure 3 According to this disclosure, the display device 100 is bent into a curved shape. That is, the edge display area of ​​the first substrate 100 is bent toward the second surface of the second substrate 140 to have a certain radius of curvature, and thus surrounds the side of the second substrate 140. At this time, the edge display area of ​​the first substrate 100 can be bent to have a radius of curvature of 1 mm to 5 mm.

[0072] An edge display (or secondary display) is positioned at the edge of the curved display area DA as described above. On the other hand, a front display (or main display), which is generally flat, is positioned within the uncurved display area DA.

[0073] As described above, the display device according to this disclosure is easy to bend because the second region A2 of the second substrate 140 is formed to be thinner than the first region A1. Moreover, a bezel width of 10 μm or less can be obtained by bending, and damage to the thin-film transistor and / or light-emitting diode layers can be avoided during bending.

[0074] Figure 4 This illustrates a display device along a second embodiment of the present disclosure. Figure 1 A cross-sectional view taken from line I-I'. Figure 5 This illustrates a display device according to a third embodiment of the present disclosure. Figure 1 A cross-sectional view taken from the I-I' line.

[0075] Reference Figure 4 and Figure 5 The display device according to the second and third embodiments of this disclosure includes a first substrate 100, a pixel array layer 120, a second substrate 140, a cover layer 150, and a passivation layer 170. Repeated descriptions will be omitted, and the passivation layer 170 will be described in detail.

[0076] A passivation layer 170 is disposed on a second region A2 of the second substrate 140. The passivation layer 170 is formed to cover the second region A2 of the second substrate 140, thereby preventing the second substrate 140 from being oxidized. The passivation layer 170 can be formed by, but is not limited to, atmospheric pressure plasma processing and low temperature deposition processes.

[0077] According to one embodiment, the second region A2 of the second substrate 140 is a region partially etched by an etching process and is exposed to external water and oxygen. Since the second substrate 140 is made of a metallic material, it may be susceptible to corrosion, and if the surface of the second substrate 140 is removed by the etching process, the second substrate is easily exposed to external water and oxygen, thereby causing oxidation (rusting). If oxidation (rusting) occurs in the second substrate 140, the surface thickness changes, and a rough surface may be produced due to the step difference caused by the thickness change.

[0078] According to one embodiment, a passivation layer 170 may be disposed on the second surface A2 of the second substrate 140 to prevent oxidation of the etched portion. The passivation layer 170 can prevent corrosion of the second substrate 140 by blocking oxygen and / or water from penetrating into it. The passivation layer 170 may be made of a single layer or multiple layers. For example, the passivation layer 170 may be formed of any one of SiOx, SiNx, and SiON, or may be formed of multiple layers of alternating deposited inorganic films.

[0079] The passivation layer 170 can be formed with a thickness of 1 μm or less. Since the second region A2 of the second substrate 140 corresponds to a region where the thickness is reduced to facilitate bending, the passivation layer 170 is formed with a thin thickness to maintain the thin thickness of the second region. For example, since the second substrate 140 can be formed in the second region A2 with a thickness of 20 μm to 80 μm, the passivation layer 170 is formed with a thickness thinner than that of the second substrate 140. Therefore, the thickness of the second substrate 140 and the passivation layer 170 in the second region A2 are thinner than the thickness of the second substrate 140 in the first region A1. In this way, since the passivation layer 170 is formed with a thin thickness, the stress applied to the display panel is not increased, and oxidation of the second substrate 140 can be avoided at the same time.

[0080] Refer again Figure 5 According to one embodiment, the passivation layer 170 can be configured to cover the boundary between the first region A1 and the second region A2.

[0081] If the second substrate 140 is partially etched using an etching process, oxidation of the second substrate 140 may occur even at the boundary between the first region A1 and the second region A2, as well as at the second region A2. A passivation layer 170 can be formed at some areas of the boundary between the end of the first region A1 and the second region A2, to completely cover the boundary between the first region A1 and the second region A2. In this way, the passivation layer 170 can be formed to completely cover the boundary between the first region A1 and the second region A2, preventing oxidation from occurring at some areas of the end of the first region A1 and at the second region A2.

[0082] Figure 6 This illustrates a display device according to a fourth embodiment of the present disclosure. Figure 1 A cross-sectional view taken from line I-I'. Figure 7 This illustrates a display device according to a fifth embodiment of the present disclosure. Figure 1 The cross-sectional view taken from the I-I' line, and Figure 8 This illustrates a display device according to a sixth embodiment of the present disclosure. Figure 1 A cross-sectional view taken from the I-I' line.

[0083] Reference Figure 6 to Figure 8 The display device according to the fourth to sixth embodiments of the present invention includes a first substrate 100, a pixel array layer 120, a second substrate 140, a cover layer 150, a passivation layer 170, and a trench 180. Repeated descriptions will be omitted, and the trench 180 will be described in detail.

[0084] A groove 180 is disposed in a second region A2 of the second substrate 140. The groove 180 is disposed between the boundary of the first region A1 and the second region A2 and the end portion DP of the second substrate 140. The end portion DP may be defined at both ends of the second substrate 140 and may be a portion included in the second region A2.

[0085] According to one embodiment, a display device is configured such that a second substrate 140 is not completely etched in a second region A2 and has a groove 180. Since the second region A2 corresponds to the regions located at the two ends of the second substrate 140, during the etching of the second substrate 140 in the second region A2, the sides of the second substrate 140 can be etched together with the second substrate 140. However, according to this disclosure, the display device can be configured such that regions of the second substrate 140 in the second region A2, except for the end portions DP, are etched to form the groove 180.

[0086] In a display device according to one embodiment, since the second substrate 140 at the end portion DP is not etched, the problem caused by the etching of the sides of the second substrate 140 can be solved. The width of the end portion DP is smaller than the width of the second region A2, and corresponds to a portion that is less affected by stress during bending compared to the central portion of the second region A2. Therefore, if the second substrate 140 is etched in the second region A2 except for the end portion DP, the stress generated during bending can be reduced even if the end portion DP in the second substrate 140 is not etched.

[0087] According to one embodiment, the display device may further include a passivation layer 170 for covering the groove 180. In this case, the passivation layer 170 may be disposed inside the groove 180 and may be configured to cover the boundary and end portions DP of the first region A1 and the second region A2. Since the passivation layer 170 has the same characteristics as the aforementioned passivation layer, a repeated description will be omitted.

[0088] Figure 9 This illustrates a display device according to a seventh embodiment of the present disclosure. Figure 1 A cross-sectional view taken from the I-I' line;

[0089] Reference Figure 9 The display device according to a seventh embodiment of the present invention includes a first substrate 100, a pixel array layer 120, a second substrate 140, a cover layer 150, a passivation layer 170, and a trench 180. Repeated descriptions will be omitted, and descriptions will be given based on the differences between the aforementioned embodiments.

[0090] The passivation layer 170 is configured to cover the entire surface of the second substrate 140. Since the second substrate 140 is made of a metallic material, oxidation may occur even in areas that are not etched. In the display device according to this disclosure, because the passivation layer 170 is formed to cover the entire surface of the second substrate 140, oxidation that may occur in areas that are not etched or in partially etched areas can be avoided. In this way, if the passivation layer 170 is provided on the entire surface of the second substrate 140, oxidation in all areas of the second substrate 140 can be avoided, thereby achieving reliability.

[0091] As described above, the advantage of the display device according to this disclosure is that it is optimized for stress to facilitate bending of the curved portion and can prevent the pixel array layer disposed on the curved portion from being damaged during bending.

[0092] It will be apparent to those skilled in the art that various modifications and variations may be made to this disclosure without departing from its spirit or scope. Therefore, this disclosure is intended to cover such modifications and variations as long as they fall within the scope of the appended claims and their equivalents. Consequently, the above embodiments are to be considered illustrative rather than restrictive in all respects. The scope of this disclosure must be determined by a reasonable interpretation of the appended claims, and all changes falling within the scope of their equivalents are included within the scope of this disclosure.

[0093] This application also includes the following technical solutions.

[0094] 1. A display device, comprising:

[0095] A first substrate having a display area and a non-display area;

[0096] A pixel array layer disposed on the display area of ​​the first substrate; and

[0097] A second substrate disposed on the pixel array layer has a first region and a second region bent from the first region, wherein the thickness of the second region is different from the thickness of the first region.

[0098] 2. The display device according to claim 1, wherein the thickness of the second region is thinner than the thickness of the first region.

[0099] 3. The display device according to claim 2 further includes a passivation layer disposed on the second region of the second substrate.

[0100] 4. The display device according to claim 3, wherein the thickness of the first region is thicker than the sum of the thickness of the second region and the thickness of the passivation layer.

[0101] 5. The display device according to claim 3, wherein the passivation layer is thinner than the second region.

[0102] 6. The display device according to claim 3, wherein the passivation layer covers the boundary between the first region and the second region of the second substrate.

[0103] 7. The display device according to claim 3, wherein the passivation layer is formed of a single layer or multiple layers of SiNx and SiOx.

[0104] 8. A display device, comprising:

[0105] A first substrate having a display area and a non-display area;

[0106] A pixel array layer disposed on the display area of ​​the first substrate; and

[0107] A second substrate disposed on the pixel array layer has: a first region having a first groove and a second region having a second groove, wherein the first groove and the second groove include curved regions.

[0108] 9. The display device according to claim 8, further comprising:

[0109] A passivation layer covering the first and second trenches.

[0110] 10. The display device according to claim 9, wherein the passivation layer covers a first boundary between the first groove and the curved region and a second boundary between the second groove and the curved region.

[0111] 11. The display device according to claim 9, wherein the passivation layer covers the entire surface of the second substrate.

[0112] 12. A display device, comprising:

[0113] base layer;

[0114] A first cover layer covering a first end of the base layer and a second cover layer covering a second end of the base layer;

[0115] A pixel array layer on top of the base layer, the pixel array layer extending between the first cover layer and the second cover layer; and

[0116] A first substrate on top of the pixel array layer, the first substrate having: a first portion adjacent to the first cover layer; a second portion connecting the first portion and the third portion; and the third portion adjacent to the second cover layer, the first portion and the third portion of the first substrate having a first thickness, the second portion having a second thickness, wherein the first thickness is different from the second thickness.

[0117] 13. The display device according to claim 12, wherein the first thickness is thinner than the second thickness.

[0118] 14. The display device according to claim 12, further comprising:

[0119] A base layer having a first end and a second end, the first end having a radius of curvature capable of encompassing a first portion of the first substrate, and the second end having a radius of curvature capable of encompassing a third portion of the first substrate.

[0120] 15. The display device according to claim 14, wherein the radius of curvature is in the range of 1 mm to 5 mm.

[0121] 16. The display device according to claim 14, further comprising:

[0122] The second portion of the first substrate that is not bent.

[0123] 17. The display device according to claim 12, further comprising:

[0124] The vertical offset portion between the first portion and the second portion, and the second vertical offset portion between the third portion and the second portion.

[0125] 18. The display device according to claim 12, further comprising:

[0126] A first passivation layer covering the first portion of the first substrate; and

[0127] A second passivation layer covering the third portion of the first substrate.

[0128] 19. The display device according to claim 17, further comprising:

[0129] The first passivation layer covering the vertical offset portion; and

[0130] The second passivation layer covers the second vertical offset portion.

[0131] 20. A display device, comprising:

[0132] base layer;

[0133] A first cover layer covering a first end of the base layer and a second cover layer covering a second end of the base layer;

[0134] A pixel array layer on top of the base layer, the pixel array layer extending between the first cover layer and the second cover layer; and

[0135] A first substrate on top of the pixel array layer, the first substrate having: a first end adjacent to the first cover layer; and a second end adjacent to the second cover layer, the first end having a first groove and the second end having a second groove.

[0136] 21. The display device according to claim 20, further comprising:

[0137] The base layer has a first end and a second end, the first end of the base layer having a radius of curvature that can encompass the first end of the first substrate, and the second end of the base layer having a radius of curvature that can encompass the second end of the first substrate.

[0138] 22. The display device according to claim 20, further comprising:

[0139] A first passivation layer covers the first trench, and a second passivation layer covers the second trench. The present invention also provides the following technical solutions:

[0140] Option 1. A display device, comprising:

[0141] A first substrate having a display area and a non-display area;

[0142] A pixel array layer disposed on the display area of ​​the first substrate; and

[0143] A second substrate is disposed on the pixel array layer, the lower surface of the second substrate faces the pixel array layer, and the second substrate has a first region and a second region.

[0144] The thickness of the second region is thinner than that of the first region.

[0145] Option 2. The display device according to Option 1, wherein the lower surface of the second substrate is parallel to the pixel array layer.

[0146] Option 3. The display device according to Option 2, wherein the first substrate has a flat lower surface and a flat upper surface facing the pixel array layer.

[0147] Solution 4. The display device according to Solution 1, wherein the first substrate has the same thickness in the region where the first region and the second region overlap the second substrate.

[0148] Option 5. The display device according to Option 1, wherein the second substrate is configured to overlap with the pixel array layer and does not extend beyond the pixel array layer.

[0149] Solution 6. The display device according to Solution 5 further includes an adhesive layer between the second substrate and the pixel array layer, wherein the second substrate does not extend beyond the adhesive layer.

[0150] Solution 7. The display device according to Solution 1, wherein the pixel array layer is disposed within the display area.

[0151] The first region and the second region of the second substrate are disposed on the pixel array layer.

[0152] Solution 8. The display device according to Solution 1, wherein the device further includes a cover layer disposed on the first substrate, and

[0153] The second substrate is surrounded by the pixel array layer and the cover layer.

[0154] Solution 9. The display device according to Solution 8 further includes a buffer layer on the first substrate, and the cover layer and the pixel array layer are disposed on the buffer layer.

[0155] Solution 10. The display device according to Solution 1 further includes a passivation layer disposed on the second region of the second substrate.

[0156] Solution 11. The display device according to Solution 10, wherein the thickness of the first region is thicker than the sum of the thickness of the second region and the thickness of the passivation layer.

[0157] Option 12. The display device according to Option 11, wherein the thickness of the passivation layer is thinner than the thickness of the second region.

[0158] Solution 13. The display device according to Solution 10, wherein the passivation layer covers the boundary between the first region and the second region of the second substrate.

[0159] Option 14. The display device according to Option 10, wherein the passivation layer is formed by multiple or single layers of SiNx and SiOx.

Claims

1. A display device, comprising: A first substrate having a display area and a non-display area; A pixel array layer disposed on the display area of ​​the first substrate; as well as A second substrate is disposed on the pixel array layer, the lower surface of the second substrate faces the pixel array layer, and the second substrate has a first region and a second region. The thickness of the second region is thinner than that of the first region; and The second substrate is configured to overlap with the pixel array layer, but does not extend beyond the pixel array layer.

2. The display device according to claim 1, wherein, The lower surface of the second substrate is parallel to the pixel array layer.

3. The display device according to claim 2, wherein, The first substrate has a flat lower surface and a flat upper surface facing the pixel array layer.

4. The display device according to claim 1, wherein, The first substrate has the same thickness in the region where the first region and the second region overlap the second substrate.

5. The display device according to claim 1, further comprising an adhesive layer between the second substrate and the pixel array layer, wherein, The second substrate does not extend beyond the adhesive layer.

6. The display device according to claim 1, wherein, The pixel array layer is disposed within the display area. The first region and the second region of the second substrate are disposed on the pixel array layer.

7. The display device according to claim 1, wherein, The device further includes a cover layer disposed on the first substrate, and The second substrate is surrounded by the pixel array layer and the cover layer.

8. The display device according to claim 7, further comprising a buffer layer on the first substrate, and the cover layer and the pixel array layer disposed on the buffer layer.

9. The display device according to claim 1, further comprising a passivation layer disposed on the second region of the second substrate.

10. The display device according to claim 9, wherein, The thickness of the first region is greater than the sum of the thickness of the second region and the thickness of the passivation layer.

11. The display device according to claim 10, wherein, The passivation layer is thinner than the second region.

12. The display device according to claim 9, wherein, The passivation layer covers the boundary between the first region and the second region of the second substrate.

13. The display device according to claim 9, wherein, The passivation layer is formed by multiple or single layers of SiNx and SiOx.

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