Display device and multi-display

Abstract

This multidisplay is provided with a first display device and a second display device. The first display device comprises a first substrate which has a first display surface and a first side surface connected thereto, a first display unit which is positioned on the first display surface, and a first side surface wiring which is positioned from the first side surface to the first display surface. The second display device comprises a second substrate which has a second display surface and a second side surface connected thereto, a second display unit which is positioned on the second display surface, and a second side surface wiring which is positioned from the second side surface to the second display surface. The first side surface and the second side surface are arranged in proximity and facing each other, and the first side surface wiring and the second side surface wiring are in positions not opposite of each other.

Description

[Technical field]

[0001] The present disclosure relates to a display device and a multi-display (composite display device). [Background technology]

[0002] A display device and a multi-display according to the prior art are described, for example, in US Pat. No. 5,399,323. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-141944 A Summary of the Invention

[0004] The multi-display of the present disclosure includes a first display device having a first substrate having a first display surface and a first side surface connected thereto, a first display section located on the first display surface, and first side surface wiring located from above the first side surface to above the first display surface; a second display device including a second substrate having a second display surface and a second side surface connected thereto, a second display section located on the second display surface, and second side surface wiring located from above the second side surface to above the second display surface; The first side surface and the second side surface are disposed adjacent to each other and facing each other, The first side surface wiring and the second side surface wiring are not opposed to each other.

[0005] The display device of the present disclosure includes a substrate having a display surface, a side surface connected to the display surface, and an opposite side surface opposite the side surface; A display unit located on the display surface; a side wiring located from the side surface to the display surface; an opposite side wiring located from above the opposite side to above the display surface, The side wiring and the opposite side wiring are not opposed to each other. [Brief description of the drawings]

[0006] The objects, features, and advantages of the present disclosure will become more apparent from the following detailed description and drawings. [Figure 1] FIG. 1 is a plan view illustrating a multi-display according to an embodiment of the present disclosure. [Diagram 2] 2 is an enlarged plan view showing a main part of the multi-display shown in FIG. 1. [Diagram 3] 3 is a cross-sectional view taken along the cutting line A1-A2 in FIG. 2. [Figure 4] 2 is an enlarged plan view showing a main part of a modified example of the multi-display of FIG. 1. [Diagram 5] 5 is a cross-sectional view taken along the line B1-B2 in FIG. 4. [Figure 6] 2 is an enlarged plan view showing a main part of a modified example of the multi-display of FIG. 1. [Figure 7] 2 is an enlarged plan view showing a main part of a modified example of the multi-display of FIG. 1. [Figure 8] FIG. 11 is a plan view showing a multi-display according to another embodiment of the present disclosure. [Figure 9] 9 is an enlarged plan view showing a main part of the multi-display of FIG. 8. [Figure 10] 10 is a cross-sectional view taken along the cutting line C1-C2 in FIG. 9. [Figure 11] 9 is an enlarged plan view showing a main part of a modified example of the multi-display of FIG. 8. [Figure 12] FIG. 11 is a plan view showing a multi-display according to another embodiment of the present disclosure. [Figure 13] FIG. 1 is a plan view illustrating a configuration of a display device according to an embodiment of the present disclosure. [Figure 14] 14 is a plan view showing a mother substrate for manufacturing the display device of FIG. 13. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] First, a display device having a configuration on which the display device of the present disclosure is based will be described.

[0008] As a display device having a configuration on which the display device of the present disclosure is based, for example, Patent Document 1 proposes combining multiple display devices to form a composite large display device, a so-called multi-display.

[0009] In the conventional multi-display, for example, the wiring La such as side wiring provided on the side of the joint (tiling side) of the display device A and the adjacent display device B may come into contact with the wiring Lb provided on the side of the joint of the display device B, resulting in an electrical short circuit. In addition, when the wiring La and the wiring Lb come into contact with each other and collide, the wiring La and the wiring Lb may be damaged, broken, peeled off, or otherwise deteriorated. In addition, when the wiring La comes into contact with the side of the display device B and when the wiring Lb comes into contact with the side of the display device A and collide, the wiring La and the wiring Lb may be damaged, broken, peeled off, or otherwise deteriorated. In addition, when the wiring La and the side of the display device B and the wiring Lb continue to be in contact with each other, the contact parts may be subjected to stress due to misalignment caused by vibration and thermal expansion, rubbing of the contact parts, compression, or the like, which may cause deterioration in the same manner. In addition, the presence of the wirings La and Lb tends to increase the gap between the display device A and the display device B, making it easier to see the joint (tiling) between the display device A and the display device B. As a result, the operational reliability and long-term reliability of the multi-display may decrease, and the display quality of the multi-display may decrease.

[0010] Hereinafter, embodiments of the display device and multi-display of the present disclosure will be described with reference to the accompanying drawings. Each of the figures referred to below shows the main components of the display device and multi-display according to the embodiment of the present disclosure. The display device and multi-display according to the embodiment of the present disclosure may include well-known components such as a circuit board, wiring conductors, control IC, and LSI, which are not shown. Each of the figures referred to below is schematic, and the shapes, arrangement positions, dimensions, etc. of the components of the display device and multi-display are not necessarily accurately illustrated.

[0011] 1 to 12 are diagrams relating to a multi-display according to various embodiments of the present disclosure. In addition, in Figs. 1, 2, 4, 6, 7, 8, and 12, an insulating base as an insulating layer laminate having internal wiring, which is located on the first surface of a substrate, is omitted. Fig. 2 shows an enlarged view of part A in Fig. 1. The plan views shown in Figs. 4, 6, and 7 correspond to the plan view shown in Fig. 2.

[0012] The multi-display 200 of this embodiment includes a first display device 1 and a second display device 2. The first display device 1 includes a first substrate 31, a first display section 4a, and a first side wiring 5. The second display device 2 includes a second substrate 32, a second display section 4b, and a second side wiring 6. Hereinafter, the first display device 1 and the second display device 2 may be collectively referred to as "display device D", the first substrate 31 and the second substrate 32 may be collectively referred to as "substrate 3", and the first display section 4a and the second display section 4b may be collectively referred to as "display section 4".

[0013] In addition, the first display surface 3a1 of the first substrate 31 and the second display surface 3a2 of the second substrate 32 may be collectively referred to as the "display surface 3a". The first opposite display surface 3b1 of the first substrate 31 and the second opposite display surface 3b2 of the second substrate 32 may be collectively referred to as the "opposite display surface 3b". The first side surface 3c1 of the first substrate 31 may be collectively referred to as the "side surface 3c". The first opposite side surface 3d1 of the first substrate 31 and the second opposite side surface 3d2 of the second substrate 32 may be collectively referred to as the "opposite side 3d". The first drive unit 15a of the first display device 1 and the second drive unit 15b of the second display device 2 may be collectively referred to as the "drive unit 15".

[0014] It can also be said that the display surface 3a is the front surface of the substrate 3, and the opposite display surface 3b is the rear surface of the substrate 3. The opposite surface 3d of the substrate 3 can also be said to be the side surface (opposing side surface) facing the side surface 3c.

[0015] 1, the multi-display 200 of the present embodiment includes a first display device 1 having a first substrate 31 having a first display surface 3a1 and a first side surface 3c1 connected thereto, a first display unit 4a located on the first display surface 3a1, and a first side surface wiring 5 located from the first side surface 3c1 to the first display surface 3a1, and a second substrate 32 having a second display surface 3a2 and a second side surface (second opposite side surface) 3d2 connected thereto, a second display unit 4b located on the second display surface 3a2, and a second side surface wiring 6 located from the second side surface 3d2 to the second display surface 3a2. The first side surface 3c1 and the second side surface 3d2 are disposed close to each other and opposed to each other, and the first side surface wiring 5 and the second side surface wiring 6 are not opposed to each other.

[0016] The above configuration provides the following effects. The first display device 1 and the second display device 2 can be arranged in close proximity. Therefore, even if the pixel pitch of the multi-display 200 is relatively narrow, the pixel pitch of the multi-display 200 can be prevented from fluctuating at the joint between the first display device 1 and the second display device 2, and as a result, the display quality of the multi-display 200 is improved. In addition, the first side wiring 5 and the second side wiring 6 can be prevented from contacting each other and causing an electrical short circuit. In addition, the first side wiring 5 and the second side wiring 6 can be prevented from contacting each other and colliding with each other, causing deterioration such as damage, breakage, peeling, etc., of the first side wiring 5 and the second side wiring 6. In addition, the first side wiring 5 and the second side wiring 6 can be prevented from contacting each other and colliding with each other, and the second side wiring 6 and the first side wiring 3c1 of the first substrate 31 can be prevented from contacting each other and colliding with each other. As a result, the first side wiring 5 and the second side wiring 6 can be prevented from being damaged, broken, peeled, and other deterioration. Furthermore, when the state in which the first side surface wiring 5 and the second side surface 3d2 of the second substrate 32 and the state in which the second side surface wiring 6 and the first side surface 3c1 of the first substrate 31 are in contact continue, stress is applied to the contact portion due to misalignment caused by vibration and thermal expansion, rubbing of the contact portion, pressure, etc., and deterioration may occur similarly, but the occurrence of such problems can be suppressed. Furthermore, since the gap (joint portion) between the first display device 1 and the second display device 2 is reduced, it is possible to suppress the joint portion from being visible. Therefore, the operational reliability and long-term reliability of the multi-display 200 are improved, and the display quality of the multi-display 200 is improved.

[0017] 1, the first side surface 3c1 of the first substrate 31 is the side surface to be joined (joining portion side surface), and the second side surface (second opposite side surface) 3d2 of the second substrate 32 is the side surface to be joined (joining portion side surface), but this configuration is not necessarily required. For example, when the first substrate 31 and the second substrate 32 are square, the side surface adjacent to the second side surface 3d2 of the second substrate 32 may be the joining portion side surface. Note that the side surface 3c2 of the second substrate 32 is the non-joining portion side surface opposite the second side surface 3d2.

[0018] The substrate 3 may be, for example, a rectangular plate including a square plate and a rectangular plate, a parallelogram plate, a trapezoidal plate, a hexagonal plate, an octagonal plate, or another shape. In the following description, the substrate 3 is assumed to be in the shape of a rectangular plate.

[0019] The substrate 3 in one display device includes a display surface (one main surface) 3a, a counter display surface (the other main surface) 3b opposite to the display surface 3a, a side surface 3c continuing to the display surface 3a, and an opposite side surface 3d opposite to the side surface 3c. As shown in FIG. 1, the first side surface 3c1 of the first substrate 31 in the first display device 1 corresponds to the side surface 3c of the substrate 3, and the second side surface 3d2 of the second substrate 32 in the second display device 2 corresponds to the opposite side surface 3d of the substrate 3. The side surface 3c2 of the second substrate 32 in the second display device 2 corresponds to the side surface 3c of the substrate 3. That is, the second substrate 32 is disposed in a direction opposite to that of the first substrate 31 in a plan view. In other words, the second substrate 32 is rotated 180° with respect to the first substrate 31. In this case, however, the arrangement relationship of the light-emitting elements 71r, 71g, 71b arranged on the first display surface 3a1 of the first substrate 31 may be the same as the arrangement relationship of the light-emitting elements 71r, 71g, 71b arranged on the second display surface 3a2 of the second substrate 32. Therefore, the first side surface 3c1 of the first substrate 31 in the first display device 1 corresponds to the side surface 3c of the substrate 3 and is the joint side surface. The second side surface 3d2 of the second substrate 32 in the second display device 2 corresponds to the opposite side surface 3d of the substrate 3 and is the joint side surface.

[0020] In the following, an example will be described in which the side surface 3c and the opposite surface 3d include the long side of the display surface 3a, but the side surface 3c and the opposite surface 3d may include the short side of the display surface 3a.

[0021] The multi-display 200 may include a base substrate 17 (shown in FIG. 3). The first display device 1 may be fixed on the base substrate 17 so that the first opposite display surface 3b1 of the first substrate 31 faces one main surface 17a of the base substrate 17. The second display device 2 may be fixed on the base substrate 17 so that the second opposite display surface 3b2 of the second substrate 32 faces one main surface 17a of the base substrate 17. The first display device 1 and the second display device 2 may be fixed to one main surface 17a of the base substrate 17 by a fixing member (not shown) such as an adhesive or a screw. The first display device 1 may be fitted into a frame body, and the frame body may be bonded and fixed to the base substrate 17 by an adhesive, or the frame body may be mechanically fixed to the base substrate 17 by a screw, a fitting member, a locking member, or the like. The second display device 2 may also be fixed to the base substrate 17 by a similar fixing means.

[0022] The first display device 1 may be provided with a heat dissipation member such as a cooling pipe or a heat dissipation fin on the first counter display surface 3b1 side of the first substrate 31. The cooling pipe may be configured so that a coolant such as air or water passes through or circulates inside the pipe. The second display device 2 may also be provided with a similar heat dissipation member.

[0023] In the multi-display 200, the first display surface 3a1 and the second display surface 3a2 may be flush with each other. In addition, in the multi-display 200, the first display surface 3a1 and the second display surface 3a2 may be non-parallel. For example, the display surfaces 3a of the multiple display devices may form an overall convex curved surface or concave curved surface.

[0024] The substrate 3 may be made of, for example, a glass material, a ceramic material, a resin material, etc. Examples of glass materials used for the substrate 3 include borosilicate glass, crystallized glass, and quartz. Examples of ceramic materials used for the substrate 3 include alumina (Al2O3), zirconia (ZrO2), silicon nitride (Si3N4), silicon carbide (SiC), and aluminum nitride (AlN). Examples of resin materials used for the substrate 3 include epoxy resin, polyimide resin, polyamide resin, acrylic resin, and polycarbonate resin.

[0025] The substrate 3 may be made of, for example, a metal material, an alloy material, a semiconductor material, etc. Examples of metal materials used for the substrate 3 include aluminum (Al), magnesium (Mg) (particularly high-purity magnesium with a purity of 99.95% or more), zinc (Zn), tin (Sn), copper (Cu), chromium (Cr), nickel (Ni), etc. Examples of alloy materials used for the substrate 3 include duralumin (Al-Cu alloy, Al-Cu-Mg alloy, Al-Zn-Mg-Cu alloy), which is an aluminum alloy mainly composed of aluminum, magnesium alloy (Mg-Al alloy, Mg-Zn alloy, Mg-Al-Zn alloy), titanium boronide, stainless steel, Cu-Zn alloy, etc. Examples of semiconductor materials used for the substrate 3 include silicon (Si), germanium (Ge), gallium arsenide (GaAs), etc.

[0026] The display unit 4 is located on the display surface 3a of the substrate 3. The display unit 4 includes a plurality of pixels 7. The plurality of pixels 7 may be arranged in a matrix array in a plan view, as shown in Fig. 1 for example. The display unit 4 may include an insulating base 8 located on the display surface 3a, and a plurality of pixels 7 located in and on the insulating base 8, as shown in Fig. 3 for example.

[0027] The insulating base 8 may have a single-layer structure made of a single insulating layer, or may have a laminated structure made of a plurality of insulating layers stacked together. In this embodiment, as shown in FIG. 3, for example, the insulating base 8 has a laminated structure made of a plurality of insulating layers 81, 82, and 83 stacked together. The insulating layers 81, 82, and 83 may be made of, for example, silicon oxide (SiO2), silicon nitride (Si3N4), or the like. The insulating base 8 may include an insulating layer made of an organic resin, such as an acrylic resin layer or a polycarbonate resin layer.

[0028] Each of the multiple pixels 7 may include a light emitting element 71 and a pixel circuit 72 that drives the light emitting element 71.

[0029] The light-emitting element 71 may be a self-emitting element such as a light-emitting diode (LED) element or a semiconductor laser (LD) element. The light-emitting element 71 may be a micro light-emitting diode (μLED) element. When the light-emitting element 71 is a μLED element, the light-emitting element 71 may have a rectangular shape with a side length of about 1 μm to 100 μm or about 5 μm to 20 μm when viewed from a direction perpendicular to its light-emitting surface. Note that "~" means through, and the same applies hereinafter.

[0030] In this embodiment, as shown in Fig. 1, each pixel 7 includes a plurality of light-emitting elements 71. The plurality of light-emitting elements 71 may be, for example, a light-emitting element 71r that emits red light, a light-emitting element 71g that emits green light, and a light-emitting element 71b that emits blue light. This allows the multi-display 200 to perform full-color gradation display.

[0031] Each pixel 7 may have at least one of the light-emitting element 71 that emits yellow light and the light-emitting element 71 that emits white light, in addition to the light-emitting elements 71r, 71g, and 71b. This makes it possible to improve the color rendering and color reproducibility of the multi-display 200. Each pixel 7 may have a light-emitting element 71 that emits orange light, reddish-orange light, reddish-purple light, or purple light, instead of the light-emitting element 71r that emits red light. Each pixel may have a light-emitting element 71 that emits yellow-green light, instead of the light-emitting element 71g that emits green light.

[0032] The pixel circuit 72 includes a thin film transistor (TFT), a wiring conductor, and the like. FIG. 3 illustrates only the TFT included in the pixel circuit 72. The TFT may have a semiconductor film made of, for example, amorphous silicon (a-Si), low-temperature polysilicon (LTPS), or the like, and may have three terminals, a gate electrode, a source electrode, and a drain electrode. The TFT functions as a switching element that switches between conduction and non-conduction between the source electrode and the drain electrode according to a voltage applied to the gate electrode. The pixel circuit 72 may be disposed on the display surface 3a of the substrate 3, or may be disposed between a plurality of insulating layers 81, 82, and 83 of the insulating base 8. The pixel circuit 72 may be formed using a thin film formation method such as a chemical vapor deposition (CVD) method.

[0033] When the light-emitting element 71 is a two-terminal element such as a μLED element, the light-emitting element 71 may be flip-chip connected to the anode electrode 84 and the cathode electrode 85 located on the insulating base 8. The anode electrode 84 and the cathode electrode 85 may have their surfaces facing the light-emitting element 71 covered with a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO). The light-emitting element 71 and the anode electrode 84 and the cathode electrode 85 may be electrically and mechanically connected to each other by flip-chip connection using a conductive connection member such as an anisotropic conductive film (ACF), a solder ball, a metal bump, or a conductive adhesive. The light-emitting element 71 and the anode electrode 84 and the cathode electrode 85 may be electrically connected to each other by a conductive connection member such as a bonding wire.

[0034] When the substrate 3 is made of a metal material, an alloy material, or a semiconductor material, an insulating layer made of silicon oxide (SiO2), silicon nitride (Si3N4), or the like may be disposed between the display surface 3a of the substrate 3 and the display unit 4. This makes it possible to prevent the TFTs and wiring conductors of the pixel circuits 72 from shorting out with each other through the substrate 3.

[0035] The first display device 1 may include a first wiring 9 located on the first display surface 3a1. The first wiring 9 may be located at an edge portion on the first side surface 3c1 side, for example, as shown in Figs. 1 and 2. The first wiring 9 may be located within the insulating base 8 or may be located on the insulating base 8. The first wiring 9 may be a single wiring located within the insulating base 8, or may be a plurality of first wirings 91, 92 located between different layers of a plurality of insulating layers 81, 82, and 83, for example, as shown in Fig. 3.

[0036] The first wiring 9 may be electrically connected to at least one of the pixels 7 of the first display device 1. One first wiring 9 may be connected in parallel to the pixels 7 of the first display device 1. In this case, the pixels 7 may be arranged in a row direction or in a column direction. Each of the first wirings 9 may be connected in parallel to the pixels 7 arranged in each of the rows. Each of the first wirings 9 may be connected in parallel to the pixels 7 arranged in each of the columns. The first wiring 9 may be a wiring for supplying a power supply voltage to at least one of the pixels 7 of the first display device 1, or may be a wiring for supplying a light emission control signal to at least one of the pixels 7 of the first display device 1. When the light emitting element 71 is a μLED element, the power supply voltage may be a first power supply voltage VDD of, for example, about 10V to 15V, or a second power supply voltage VSS of, for example, about 0V to 3V.

[0037] The second display device 2 may include second wiring 10 located on the second display surface 3a2. The second wiring 10 may be located at an edge portion on the second side surface 3d2 side, for example, as shown in FIGS. 1 and 2. The second wiring 10 may be located within the insulating base 8 or on the insulating base 8. The second wiring 10 may be a single wiring located within the insulating base 8, or may be a plurality of wirings located between different layers of the plurality of insulating layers 81, 82, and 83.

[0038] The second wiring 10 may be electrically connected to at least one of the pixels 7 of the second display device 2. One second wiring 10 may be connected in parallel to the pixels 7 of the second display device 2. In this case, the pixels 7 may be arranged in the row direction or in the column direction. Each of the second wirings 10 may be connected in parallel to the pixels 7 arranged in each of the rows. Each of the second wirings 10 may be connected in parallel to the pixels 7 arranged in each of the columns. The second wiring 10 may be a wiring for supplying a power supply voltage (first power supply voltage VDD or second power supply voltage VSS) to at least one of the pixels 7 of the second display device 2, or may be a wiring for supplying a light emission control signal to at least one of the pixels 7 of the second display device 2.

[0039] The first wiring 9 and the second wiring 10 may be made of, for example, Mo / Al / Mo, MoNd / AlNd / MoNd, etc. Here, "Mo / Al / Mo" indicates a layered structure in which an Al layer is layered on a Mo layer, and a Mo layer is layered on an Al layer. The same applies to the others.

[0040] The first wiring 9 may have a wiring pad 9b at an end 9a on the first side surface 3c1 side. The second wiring 10 may have a wiring pad 10b at an end 10a on the second side surface 3d2 side. The wiring pads 9b, 10b may be made of a transparent conductor such as ITO or IZO.

[0041] The first side surface wiring 5 is located from above the first side surface 3c1 to above the first display surface 3a1. The second side surface wiring 6 is located from above the second side surface 3d2 to above the second display surface 3a2. Hereinafter, the first side surface wiring 5 of the first display device 1 may be referred to as "first side surface wiring 51," and the second side surface wiring 6 of the second display device 2 may be referred to as "second side surface wiring 62."

[0042] The first side wiring 51 may be connected to the wiring pad 9b and electrically connected to the first wiring 9, as shown in FIG. 3, for example. Furthermore, the first side wiring 51 may be located from the first side surface 3c1 to the first opposite display surface 3b1, as shown in FIG. 3, for example, and may be connected to the first driving unit 15a (shown in FIG. 1) located on the first opposite display surface 3b1 via the back wiring 14 located on the first opposite display surface 3b1. The first driving unit 15a may generate a power supply voltage and a light emission control signal to be supplied to the multiple pixels 7 of the first display device 1. In addition, the back wiring 14 may be covered by a protective layer 21, as shown in FIG. 3, for example. The protective layer 21 may be made of an inorganic insulating material such as silicon oxide (SiO2) or silicon nitride (Si3N4), or may be made of an organic insulating material such as an acrylic resin or an epoxy resin.

[0043] The second side surface wiring 62 may be connected to the wiring pad 10b and electrically connected to the second wiring 10. Furthermore, the second side surface wiring 62 may be located from the second side surface 3d2 onto the second counter-display surface 3b2, and may be connected to a second drive unit 15b (shown in FIG. 1) located on the second counter-display surface 3b2 via a back surface wiring 14 located on the second counter-display surface 3b2. The second drive unit 15b may generate a power supply voltage and a light emission control signal to be supplied to the plurality of pixels 7 of the second display device 2.

[0044] The first side wiring 5 may be formed by applying a conductive paste containing conductive particles such as Ag, Cu, Al, stainless steel, uncured resin components, alcohol solvent, water, etc., to a desired portion from the side 3c of the substrate 3 to the display surface 3a and the opposite display surface 3b, followed by a heating method, a photocuring method in which the paste is cured by irradiation with light such as ultraviolet light, a photocuring heating method, or the like. The first side wiring 5 may be formed by a thin film forming method such as plating, vapor deposition, or CVD. A groove may be formed in advance in the portion of the side 3c where the first side wiring 5 is to be formed. This makes it easier to arrange the conductive paste that becomes the first side wiring 5 in the desired portion of the side 3c. The method of forming the second side wiring 6 is the same as the method of forming the first side wiring 5, and therefore a description thereof will be omitted.

[0045] 2, the first side wiring 51 may have a height (thickness) h1 from the first side surface 3c1 in a plan view of, for example, about 5 μm to 50 μm, about 10 μm to 30 μm, or about 15 μm to 20 μm. The second side wiring 62 may have a height (thickness) h2 from the second side surface 3d2 in a plan view of, for example, about 5 μm to 50 μm, about 10 μm to 30 μm, or about 15 μm to 20 μm. When an overcoat layer such as a protective layer is provided on the surface of the first side wiring 51 and the surface of the second side wiring 62, the height h1 of the first side wiring 51 and the height h2 of the second side wiring 62 may include the thickness of the overcoat layer.

[0046] The first side wiring 5 and the second side wiring 6 may have a multi-layer laminated structure. This allows the thicknesses of the wirings to be increased and the resistances to be reduced. In addition, it is easy to adjust the resistances of the first side wiring 5 and the second side wiring 6 to desired values. When the first side wiring 5 and the second side wiring 6 are formed by applying and baking a conductive paste, the process of applying and baking the conductive paste may be performed multiple times. When the first side wiring 5 and the second side wiring 6 are formed by a thin film formation method, the formation process may be performed multiple times. The thickness of the upper layer side of the first side wiring 5 and the second side wiring 6 of the multi-layer laminated structure may be made thinner than the thickness of the lower layer side. This makes it easier to adjust the resistances of the first side wiring 5 and the second side wiring 6 to desired values. For example, if the first side wiring 5 and the second side wiring 6 are two-layered, the thickness of the second layer (upper layer) may be made thinner than the thickness of the first layer (lower layer). The thickness of the second layer may be 0.1 times or more and less than 1 times the thickness of the first layer, but is not limited to this range.

[0047] In the multi-display 200, as shown in, for example, FIGS. 1 and 2, the first side surface 3c1 of the first display device 1 and the second side surface 3d2 of the second display device 2 are disposed close to each other and facing each other. The first side surface 3c1 and the second side surface 3d2 may be parallel. The distance d between the first side surface 3c1 and the second side surface 3d2 may be equal to or greater than the height h1 of the first side surface wiring 51 and equal to or greater than the height h2 of the second side surface wiring 62. The distance d may be equal to or less than about 100 μm, or equal to or less than about 50 μm. The distance d may be equal to or less than about 2×h1 or equal to or less than about 2×h2.

[0048] In the multi-display 200, the first side-surface wiring 51 of the first display device 1 and the second side-surface wiring 62 of the second display device 2 are positioned so as not to face each other. In other words, when viewed from a direction perpendicular to the first side surface 3c1, the first side-surface wiring 51 and the second side-surface wiring 62 are positioned so as not to overlap each other. With this configuration, the first display device 1 and the second display device 2 can be arranged close to each other while preventing the first side-surface wiring 51 and the second side-surface wiring 62 from being short-circuited. As a result, even if the pixel pitch of the display device D is relatively narrow, it is possible to prevent the pixel pitch of the multi-display 200 from fluctuating at the joint between the first display device 1 and the second display device 2, and as a result, the display quality of the multi-display 200 can be improved.

[0049] The pixel pitch may be, for example, about 40 μm to 400 μm, about 40 μm to 120 μm, about 60 μm to 100 μm, or about 80 μm.

[0050] Furthermore, in the multi-display 200, the first side surface wiring 51 and the second side surface wiring 62 are positioned so as not to face each other, and therefore it is possible to prevent the first side surface wiring 51 and the second side surface wiring 62 from colliding with each other even if vibrations, thermal expansion, and the like occur during use of the multi-display 200. As a result, it is possible to prevent damage or peeling of the first side surface wiring 51 and the second side surface wiring 62, and it is possible to improve the operational reliability and long-term reliability of the multi-display 200.

[0051] The first side surface wiring 51 and the second side surface wiring 62 may be separated from each other by a distance (defined as distance g) in a direction along the first side surface 3c1 (second side surface 3d2) in a plan view. In this case, the first side surface wiring 51 and the second side surface wiring 62 can be reliably prevented from contacting or colliding with each other. The distance g may be equal to or larger than the width (defined as width w) of one of the first side surface wiring 51 or the second side surface wiring 62 in a direction along the first side surface 3c1 (second side surface 3d2). In this case, the first side surface wiring 51 and the second side surface wiring 62 can be more reliably prevented from contacting or colliding with each other. The distance g may be from about 1 to about 10 times the width w, but is not limited to this range.

[0052] As shown in FIG. 1, the multi-display 200 may have a configuration in which the first display device 1 includes a plurality of first side wirings 51 and the second display device 2 includes a plurality of second side wirings 62. In this case, the plurality of first side wirings 51 and the plurality of second side wirings 62 are not opposed to each other. This can improve the display quality of the multi-display 200, and can improve the operational reliability and long-term reliability of the multi-display 200. The adjacent first side wirings 51 may be spaced apart by about twice the pixel pitch of the first display device 1 or more, and the adjacent second side wirings 62 may be spaced apart by about twice the pixel pitch of the second display device 2 or more. This can facilitate the routing of wiring around the periphery of the first substrate 31 and the periphery of the second substrate 32.

[0053] 2, the first side surface wiring 51 may be out of contact with the second side surface 3d2, and the second side surface wiring 62 may be out of contact with the first side surface 3c1. In other words, the distance d between the first side surface 3c1 and the second side surface 3d2 may be greater than the height h1 of the first side surface wiring 51 and greater than the height h2 of the second side surface wiring 62. This configuration can prevent the first side surface wiring 51 from colliding with the second side surface 3d2 or the second side surface wiring 62 from colliding with the first side surface 3c1 during use of the multi-display 200. As a result, damage or peeling of the first side surface wiring 51 and the second side surface wiring 62 can be prevented, and thus the operational reliability and long-term reliability of the multi-display 200 can be improved.

[0054] 4 and 5, the multi-display 200 may include a first protective layer 11 covering the first side wiring 51 and a second protective layer 12 covering the second side wiring 62. This can further suppress damage or peeling of the first side wiring 51 and the second side wiring 62, and therefore can further improve the operational reliability and long-term reliability of the multi-display 200.

[0055] The first protective layer 11 may be located from the first side surface 3c1 to the first display surface 3a1, but the portion of the first protective layer 11 located on the first display surface 3a1 does not have to extend beyond the wiring pad 9b to the center side of the first display surface 3a1, as shown in Fig. 4 for example. With this configuration, it is possible to prevent the first protective layer 11 from interfering with the mounting of the light-emitting element 71 (light-emitting element 71r in Fig. 4), so that the light-emitting element 71 can be mounted efficiently.

[0056] The second protective layer 12 may be located from the second side surface 3d2 to the second display surface 3a2, but the portion of the second protective layer 12 located on the second display surface 3a2 does not have to extend beyond the wiring pad 10b to the center side of the second display surface 3a2, as shown in Fig. 4 for example. This makes it possible to prevent the second protective layer 12 from interfering with the mounting of the light-emitting element 71, and therefore makes it possible to mount the light-emitting element 71 efficiently.

[0057] The first protective layer 11 and the second protective layer 12 may be made of an insulating material. The first protective layer 11 and the second protective layer 12 may be made of an inorganic insulating material or an organic insulating material. Examples of inorganic insulating materials used for the first protective layer 11 and the second protective layer 12 include silicon oxide (SiO2) and silicon nitride (Si3N4). Examples of organic insulating materials used for the first protective layer 11 and the second protective layer 12 include acrylic resin, epoxy resin, polycarbonate resin, etc.

[0058] For example, as shown in FIG. 4, the first protective layer 11 may be out of contact with the second side surface 3d2, and the second protective layer 12 may be out of contact with the first side surface 3c1. This can prevent the first side surface wiring 51 covered by the first protective layer 11 from colliding with the second side surface 3d2 and the second side surface wiring 62 covered by the second protective layer 12 from colliding with the first side surface 3c1, even if vibrations and thermal expansion occur during use of the multi-display 200. In addition, even if the first side surface wiring 51 comes into contact with and collides with the second side surface 3d2, the first side surface wiring 51 is protected by the first protective layer 11, and therefore damage to the first side surface wiring 51 can be effectively prevented. The same applies to the second side surface wiring 62. Therefore, damage to the first side surface wiring 5 and the second side surface wiring 6 can be further prevented, and the operational reliability and long-term reliability of the multi-display 200 can be further improved.

[0059] For example, as shown in FIG. 6, a portion of the first protective layer 11 located on the first side surface 3c1 may cover not only the first side surface wiring 51 but also the first side surface 3c1. This can prevent the first side surface wirings 51 from shorting with other wirings of the multi-display 200, even if there are multiple first side surface wirings 51, thereby improving the operational reliability of the multi-display 200. A portion of the first protective layer 11 located on the first side surface 3c1 may cover a part of the first side surface 3c1 or may cover the entire first side surface 3c1. In addition, when there are multiple first side surface wirings 51, the first protective layer 11 may cover at least a part of the first side surface 3c1 across the multiple first side surface wirings 51.

[0060] 6, for example, the portion of the second protective layer 12 located on the second side surface 3d2 may cover not only the second side surface wiring 62 but also the second side surface 3d2. This makes it possible to suppress the second side surface wirings 62 from being short-circuited with other wirings of the multi-display 200, even if there are multiple second side surface wirings 62, thereby improving the operational reliability of the multi-display 200. The portion of the second protective layer 12 located on the second side surface 3d2 may cover a part of the second side surface 3d2, or may cover the entire second side surface 3d2. Furthermore, when there are multiple second side surface wirings 62, the second protective layer 12 may cover at least a part of the second side surface 3d2 across the multiple second side surface wirings 62.

[0061] The first side wiring 51 and the second side wiring 62 may have a convex curved outer surface as shown in, for example, FIGS. 2 to 5. The outer surface of the first side wiring 51 and the outer surface of the second side wiring 62 are rounded and have no corners. Therefore, even if vibrations and thermal expansion occur during use of the multi-display 200, the first side wiring 51 or the second side wiring 62 can be prevented from being caught on other components of the multi-display 200 and being damaged. As a result, the operational reliability and long-term reliability of the multi-display 200 can be improved. In addition, the first side wiring 51 and the second side wiring 62 can be further prevented from contacting each other. The first side wiring 51 and the second side wiring 62 can be arranged closer to each other.

[0062] 7, the first side surface 3c1 and the second side surface 3d2 of the multi-display 200 may be joined via a joining member 13. The joining member 13 may be, for example, an epoxy resin-based adhesive, an acrylic resin-based adhesive, or the like.

[0063] The joint member 13 may have a light-shielding property, which makes it difficult for a viewer to see the joint portion between the first display device 1 and the second display device 2, thereby improving the display quality of the multi-display 200.

[0064] The bonding member 13 itself does not need to have light-shielding properties. In this case, by attaching a tape having light-shielding properties or forming an insulating resin layer having light-shielding properties on the surface of the bonding member 13, it is possible to make it difficult for a viewer to see the bonding portion between the first display device 1 and the second display device 2.

[0065] The bonding member 13 may bond the entire surface of the first side surface 3c1 and the entire surface of the second side surface 3d2. The bonding member 13 may bond a part of the first side surface 3c1 and a part of the second side surface 3d2. In this case, even if the first substrate 31 and the second substrate 32 are misaligned due to vibration, thermal expansion, or the like, the bonding member 13 can accommodate the misalignment to some extent, thereby preventing extra stress from being applied to the joint between the first substrate 31 and the second substrate 32 and preventing the joint from being damaged. The bonding member 13 may bond 10% to 90% of the entire surface of the first substrate 3c1 and the entire surface of the second substrate 3d2, but is not limited to this range.

[0066] The bonding between the first display device 1 and the second display device 2 is not limited to bonding with an adhesive, and may be bonding with a mechanical means such as screwing. In this case, after bonding the first display device 1 and the second display device 2, it is possible to adjust the relative positions of the first display device 1 and the second display device 2. For example, the first display device 1 and the second display device 2 may each be fitted into a frame body, and the frame bodies may be connected to each other by a mechanical means such as a screw, a fitting member, or an engagement member.

[0067] The pixels 7 of the first display device 1 and the pixels 7 of the second display device 2 may be arranged in a matrix in plan view. At least a portion of the first side surface wiring 51 may be located between pixels 7p located close to the first side surface 3c1 among the pixels (also called outermost pixels) 7p located at the outermost periphery of the matrix arrangement in plan view, as shown in Fig. 8 for example. Also, at least a portion of the second side surface wiring 62 may be located between pixels 7p located close to the second side surface 3d2 among the pixels 7p located at the outermost periphery of the matrix arrangement in plan view.

[0068] 8, it is possible to reduce the area of ​​the peripheral region (also called the frame region) of the display unit 4 in the display device D. As a result, even if the pixel pitch of the display device D is narrow, it is possible to prevent the pixel pitch of the multi-display 200 from varying at the joint between the first display device 1 and the second display device 2, and as a result, it is possible to improve the display quality of the multi-display 200.

[0069] 8, even when the pixel pitch of the display device D is narrow, the reduction in the connection area between the first side surface wiring 51 and the wiring pad 9b can be suppressed, and the reduction in the connection area between the second side surface wiring 62 and the wiring pad 10b can be suppressed. This makes it possible to reliably fix the first side surface wiring 51 and the wiring pad 9b while suppressing an increase in the connection resistance (contact resistance) between the first side surface wiring 51 and the wiring pad 9b. Furthermore, it makes it possible to reliably fix the second side surface wiring 62 and the wiring pad 10b while suppressing an increase in the connection resistance (contact resistance) between the second side surface wiring 62 and the wiring pad 10b. This makes it possible to improve the operational reliability and long-term reliability of the multi-display 200.

[0070] 9, the first wiring 9 may have an end surface 9aa on the first side surface 3c1 side located inside the first side surface 3c1 (i.e., toward the center of the first display surface 3a1) in plan view. Similarly to the first wiring 9, the second wiring 10 may have an end surface 10aa on the second side surface 3d2 side located inside the second side surface 3d2 (i.e., toward the center of the second display surface 3a2) in plan view. In these cases, it is possible to improve the manufacturing yield of the first display device 1 and the second display device 2, as will be described later.

[0071] The end surface 9aa of the first wiring 9 may be covered by the first side wiring 51 and / or the first protective layer 11, for example, as shown in Figs. 9 and 10, or may be covered by the first side wiring 51, for example, as shown in Fig. 11. This makes it possible to suppress deterioration of the quality of the first wiring 9 due to corrosion or the like, and as a result, the operational reliability and long-term reliability of the multi-display 200 can be improved. The end surface 9aa of the first wiring 9 may be covered by the first side wiring 51 and the first protective layer 11 covering it. In this case, the effect of suppressing deterioration of the quality of the first wiring 9 is further improved.

[0072] The end surface 10aa of the second wiring 10 may be covered by the second side wiring 62 and / or the second protective layer 12, for example, as shown in Figs. 9 and 10, or may be covered by the second side wiring 62, for example, as shown in Fig. 11. This makes it possible to suppress deterioration of the quality of the second wiring 10 due to corrosion or the like, and as a result, the operational reliability and long-term reliability of the multi-display 200 can be improved. The end surface 10aa of the second wiring 10 may be covered by the second side wiring 62 and the second protective layer 12 covering it. In this case, the effect of suppressing deterioration of the quality of the second wiring 10 is further improved.

[0073] The first wiring 9 may have a tapered shape in which the end 9a on the first side surface 3c1 side becomes thinner toward the first side surface 3c1, as shown in, for example, FIGS. 9 and 11. This makes it easy to cover the end surface 9aa of the first wiring 9 with the first side surface wiring 51 and / or the first protective layer 11 while suppressing a decrease in the connection area between the first side surface wiring 51 and the wiring pad 9b, even when the pixel pitch of the first display device 1 is narrow. In addition, the first side surface wiring 51 and the wiring pad 9b can be reliably fixed while suppressing an increase in the connection resistance (contact resistance) between the first side surface wiring 51 and the wiring pad 9b. In addition, deterioration of the quality of the first wiring 9 due to corrosion or the like can be suppressed. As a result, the operational reliability and long-term reliability of the multi-display 200 can be improved.

[0074] The second wiring 10 may have a tapered shape in which the end 10a on the second side surface 3d2 side becomes thinner toward the second side surface 3d2, as shown in, for example, FIGS. 9 and 11. This allows the end surface 10aa of the second wiring 10 to be covered with the second side surface wiring 62 and / or the second protective layer 12 while suppressing a decrease in the connection area between the second side surface wiring 62 and the wiring pad 10b, even when the pixel pitch of the second display device 2 is narrow. In addition, the second side surface wiring 62 and the wiring pad 10b can be reliably fixed while suppressing an increase in the connection resistance (contact resistance) between the second side surface wiring 62 and the wiring pad 10b. In addition, deterioration of the quality of the second wiring 10 due to corrosion or the like can be suppressed. As a result, the operational reliability and long-term reliability of the multi-display 200 can be improved.

[0075] The first display device 1 and the second display device 2 each include a driving unit 15 located on the opposite display surface 3b of the substrate 3. The driving unit 15 may be connected to an external power supply (not shown) and generate a first power supply voltage VDD and a second power supply voltage VSS based on power supplied from the external power supply. The driving unit 15 may be connected to an external circuit (not shown) and generate control signals CS such as a light emission control signal and a scanning signal based on an image signal or the like input from the external circuit.

[0076] The driving unit 15 may be, for example, a driving element such as an IC or an LSI mounted on the opposite display surface 3b of the substrate 3 by a COG (Chip On Glass) method. The driving unit 15 may also be a thin-film circuit including a thin-film transistor (TFT) having a semiconductor layer made of low temperature polysilicon (LTPS) formed on the opposite display surface 3b of the substrate 3 by a thin-film formation method such as a chemical vapor deposition (CVD) method. The driving unit 15 may also be a driving element provided on a flexible wiring board connected to an external connection terminal located on the opposite display surface 3b of the substrate 3. The driving unit 15 may also be an external driving element electrically connected to the wiring of the flexible wiring board.

[0077] The first driving section 15a of the first display device 1 may be electrically connected to at least one of the multiple pixels 7 of the first display device 1 via the back surface wiring 14 (shown in FIGS. 3 and 5) and the first side surface wiring 51. The first driving section 15a may supply the first power supply voltage VDD, the second power supply voltage VSS, or a control signal CS to at least one of the multiple pixels 7 of the first display device 1 via the first side surface wiring 51.

[0078] The second driving section 15b of the second display device 2 may be electrically connected to at least one of the multiple pixels 7 of the second display device 2 via the back surface wiring 14 and the second side surface wiring 62. The second driving section 15b may supply the first power supply voltage VDD, the second power supply voltage VSS, or a control signal CS to the display section 4 of the second display device 2 via the second side surface wiring 62.

[0079] The driving unit 15 of the display device D and at least one pixel 7 of the display device D may be electrically connected to each other via a penetrating conductor such as a through hole penetrating the substrate 3 from the display surface 3a to the opposite display surface 3b. When the driving unit 15 and at least one pixel 7 are electrically connected to each other via the first side surface wiring 51 or the second side surface wiring 62, it is possible to reduce the area of ​​the frame region of the display device D.

[0080] The first side wiring 51 and the second side wiring 62 may be configured to be electrically connectable. In this configuration, the first display device 1 and the second display device 2 can exchange signals via the first side wiring 51 and the second side wiring 62. The first side wiring 51 and the second side wiring 62 may be electrically connected via a side connection wiring and a side connection pad connected to the side connection wiring, which are located on the first side 3c1 of the first substrate 31 and / or the second side 3d2 of the second substrate 32. The first side wiring 51 and the second side wiring 62 may be electrically connected via a counter display surface connection wiring, a side connection wiring, a side connection pad, etc. provided on the first counter display surface 3b1 of the first substrate 31 and / or the second counter display surface 3b2 of the second substrate 32. The first side surface wiring 51 and the second side surface wiring 62 may be electrically connected via a display surface connecting wiring, a side surface connecting wiring, a side surface connecting pad, or the like provided on the first display surface 3a1 of the first substrate 31 and / or the second display surface 3a2 of the second substrate 32. The first side surface wiring 51 and the second side surface wiring 62 may be electrically connected by a connecting wire, a connecting cable, a connector, or the like.

[0081] In the above embodiment, an example has been described in which the multi-display 200 includes two display devices D, but the multi-display 200 may include three or more display devices D, for example, as shown in Fig. 12. In this case, by configuring two adjacent display devices D in the same manner as the first display device 1 and the second display device 2 of the above-mentioned multi-display 200, it is possible to provide a multi-display 200 that includes three or more display devices D and has improved display quality, operational reliability, and long-term reliability.

[0082] The display device D may be configured to include, for example, side wiring 19 located from above the side surface 3e onto the display surface 3a, and side wiring 20 located from above the side surface 3f onto the display surface 3a, as shown in FIG. 12. Here, the side surface 3e is another side surface of the rectangular substrate 3 that is different from the side surface 3c and the opposite side surface 3d, and the side surface 4f is the side surface opposite to the side surface 3e. When the multi-display 200 includes three or more display devices D arranged vertically and horizontally, one display device D and the other display device D adjacent thereto may be arranged such that the side surface 3e of the one display device and the side surface 3f of the other display device D are close to each other and face each other. The side surface wiring 19 of the one display device D and the side surface wiring 20 of the other display device D may be arranged so as not to face each other.

[0083] Next, a display device according to an embodiment of the present disclosure will be described. Fig. 13 is a plan view showing a display device according to an embodiment of the present disclosure, and Fig. 14 is a plan view showing a mother substrate for manufacturing the display device of Fig. 13. In Figs. 13 and 14, an insulating base located on a first surface of the substrate is omitted.

[0084] The display device D1 of this embodiment is a display device that constitutes the multi-display 200 and has a similar configuration to the display device D described above, so parts with similar configurations are given the same reference symbols as the display device D and detailed descriptions are omitted.

[0085] Display device D1 includes a substrate 3, a display unit 4, a first side surface wiring 5, and a second side surface wiring (hereinafter, may be referred to as "opposite side wiring") 6. The opposite side surface wiring 6 can also be referred to as an opposite side surface wiring located on the side of substrate 3 opposite to first side surface wiring 5.

[0086] The first side surface wiring 5 is located from above the side surface 3c of the substrate 3 to above the display surface 3a. Furthermore, the first side surface wiring 5 may be located from above the side surface 3c to above the opposite display surface 3b. The opposite side surface wiring 6 is located from above the opposite side surface 3d to above the display surface 3a. Furthermore, the opposite side surface wiring 6 may be located from above the opposite side surface 3d to above the opposite display surface 3b.

[0087] In the display device D1, the first side surface wiring 5 and the opposite side surface wiring 6 are not positioned opposite to each other. In other words, when viewed from a direction perpendicular to the side surface 3c, the first side surface wiring 5 and the opposite side surface wiring 6 do not overlap. For this reason, a multi-display 200 can be configured by arranging the multiple display devices D1 including a first display device D1a (not shown) and a second display device D1b (not shown) such that the side surface 3c of the first display device D1a and the opposite side surface 3d of the second display device D1b are closely opposed to each other and the first side surface wiring 5 of the first display device D1a and the opposite side surface wiring 6 of the second display device D1b are not opposed to each other.

[0088] The display device D1 may include a first wiring (hereinafter, also simply referred to as wiring) 9 located on the display surface 3a. The first wiring 9 may have a configuration similar to that of the first wiring 9 shown in Figures 9 to 11. This makes it possible to provide a multi-display 200 with improved display quality, operational reliability, and long-term reliability, even when the pixel pitch of the display device D1 is narrow.

[0089] The display device D1 may include second wiring 10 located on the display surface 3a. The second wiring 10 may have a configuration similar to that of the second wiring 10 shown in FIGS. 9 to 11. This makes it possible to provide a multi-display 200 with improved display quality, operational reliability, and long-term reliability, even when the pixel pitch of the display device D1 is narrow.

[0090] The first side surface wiring 5 and the opposite side surface wiring 6 may be configured to be electrically connectable. In this configuration, the first display device D1a and the second display device D1b can exchange signals via the first side surface wiring 5 and the opposite side surface wiring 6. The configuration that allows the first side surface wiring 5 and the opposite side surface wiring 6 to be electrically connectable may be the same as the various configurations described above.

[0091] The manufacturing method of the display device D1 may include, for example, a step of cutting a mother substrate 16 having a plurality of display device precursors DP to become the display device D1, and dividing the mother substrate 16 into a plurality of display device precursors DP. As shown in FIG. 14, for example, the mother substrate 16 includes one main surface 16a corresponding to the display surface 3a of the substrate 3, and the other main surface 16b corresponding to the opposite display surface 3b of the substrate 3. On the one main surface 16a of the mother substrate 16, precursors of the display section 4 and the first wiring 9 except for the light-emitting element 71 (hereinafter, also referred to as display section precursors) are formed. In addition, the mother substrate 16 has a cutting margin 16c surrounding each display device precursor DP, and a cutting line L is set at the boundary between each display device precursor DP and the cutting margin 16c.

[0092] In the mother substrate 16 before cutting, the wiring precursor 9P that becomes the first wiring 9 may extend from inside the display device precursor DP toward the outside of the display device precursor DP (the cutting margin 16c). The wiring precursor 9P may be connected to the test pad 18 located outside the display device precursor DP (the cutting margin 16c). Before cutting the mother substrate 16, the electrical characteristics of the display device precursor DP may be inspected by contacting the test pad 18 with a test element such as a test probe terminal of a test device (not shown) and supplying a test signal from the test device to the test pad 18. The first wiring 9 is a wiring for electrically connecting the driving unit 15 and at least one pixel 7, that is, a wiring used to drive the display device D1. By performing the inspection using the wiring precursor 9P that becomes the first wiring 9, the display device precursor DP can be inspected with high accuracy, and the operational reliability of the display device D1 can be improved.

[0093] Since the wiring precursor 9P extends from inside the display device precursor DP to outside the display device precursor DP, an end face 9aa of the first wiring 9 is exposed on a side face (corresponding to the side face 3c) of the singulated display device precursor DP. By covering the end face 9aa with the first side face wiring 5 and / or the first protective layer 11, deterioration in quality of the first wiring 9 due to corrosion or the like can be suppressed. As a result, the operational reliability and long-term reliability of the display device D1 can be improved, and ultimately the operational reliability and long-term reliability of the multi-display 200 can be improved.

[0094] The mother substrate 16 can be cut by, for example, irradiating a laser beam along a cutting line L from the other main surface 16b side of the mother substrate 16. Before cutting the mother substrate 16, among the portions (hereinafter also referred to as cutting portions) C located in the vicinity of the cutting line L in the display unit precursor, the cutting portions C located in the outer periphery (periphery) of the mother substrate 16 may be removed. This can prevent the material constituting the cutting portions C located in the outer periphery (periphery) of the mother substrate 16 from being evaporated or scattered by irradiation with the laser beam and adhering as foreign matter to electrodes such as the anode electrode 84 and the cathode electrode 85 formed in the display unit precursor, wiring conductors, and the like. As a result, the manufacturing yield of the display device D1 can be improved, and the operational reliability of the display device D1 can be improved. Note that, when cutting the mother substrate 16 using a wheel cutter or the like, the cutting portions C do not need to be removed in advance.

[0095] A plurality of display device precursors DP can be produced by cutting the mother substrate 16 along the cutting line L. A plurality of light emitting elements 71 are mounted on each display device precursor DP, and a back surface wiring 14, a driving section 15, a first side surface wiring 5, an opposite side wiring 6, and the like are formed, thereby producing a plurality of display devices D1. Furthermore, a multi-display 200 can be produced by arranging the side surface 3c of one display device D1 and the opposite side surface 3d of another display device D1 so as to be close to and opposite each other.

[0096] The multi-display according to the present disclosure can have the following embodiments (1) to (13).

[0097] (1) A first display device including a first substrate having a first display surface and a first side surface connected thereto, a first display section located on the first display surface, and first side surface wiring located from above the first side surface to above the first display surface; a second display device including a second substrate having a second display surface and a second side surface connected thereto, a second display section located on the second display surface, and second side surface wiring located from above the second side surface to above the second display surface; The first side surface and the second side surface are disposed adjacent to each other and facing each other, A multi-display, wherein the first side wiring and the second side wiring are not positioned opposite each other.

[0098] (2) the first side surface wiring is not in contact with the second side surface, The multi-display according to (1) above, wherein the second side wiring is not in contact with the first side.

[0099] (3) The multi-display according to (1) or (2) above, further comprising a first protective layer covering the first side wiring and a second protective layer covering the second side wiring.

[0100] (4) the first protective layer is not in contact with the second side surface, The multi-display according to (3) above, wherein the second protective layer is not in contact with the first side surface.

[0101] (5) the first protective layer covers the first side surface, The multi-display according to (3) or (4) above, wherein the second protective layer covers the second side surface.

[0102] (6) the first side wiring has an outer surface that is a convex curved surface, The multi-display according to any one of (1) to (5) above, wherein the second side surface wiring has an outer surface which is a convex curved surface.

[0103] (7) The multi-display according to any one of (1) to (6) above, wherein the first side surface and the second side surface are joined via a joining member.

[0104] (8) The multi-display according to (7) above, wherein the joining member has a light-blocking property.

[0105] (9) A base substrate is provided, The multi-display according to any one of (1) to (8) above, wherein the first display device and the second display device are fixed on the base substrate.

[0106] (10) The first display unit and the second display unit each include a plurality of pixels arranged in a matrix on the first display surface and the second display surface, the pixels including a light-emitting element and a pixel circuit that drives the light-emitting element, the first side surface wiring is at least partially located between pixels located close to the first side surface among a plurality of outermost pixels located on the outermost periphery of a matrix array in a plan view; A multi-display as described in any one of (1) to (9) above, wherein at least a portion of the second side wiring is located between pixels located close to the second side among a plurality of outermost pixels located at the outermost periphery of a matrix-like arrangement, when viewed in a planar view.

[0107] (11) The first display device includes a first wiring connected to at least one of the plurality of pixels at an edge portion of the first side surface on the first display surface, the first wiring having a first end surface on the first side surface side located inside the first side surface, the first end surface being covered by the first side surface wiring or covered by the first side surface wiring and a first protective layer covering the first side surface wiring, The multi-display described in (1) or (2) above, wherein the second display device has a second wiring connected to at least one of the plurality of pixels at an edge portion of the second side surface on the second display surface, and the second wiring has a second end surface on the second side surface side that is located inside the second side surface, and the second end surface is covered by the second side surface wiring or is covered by the second side surface wiring and a second protective layer that covers the second side surface wiring.

[0108] (12) The first display device and the second display device each include a first drive unit located on a first counter-display surface opposite to the first display surface and a second drive unit located on a second counter-display surface opposite to the second display surface, the first display device is configured such that at least one of the plurality of pixels is electrically connected to the first driving unit via the first side wiring; The multi-display according to any one of (1) to (11) above, wherein the second display device has at least one of the plurality of pixels electrically connected to the second driving section via the second side wiring.

[0109] (13) The multi-display according to any one of (1) to (12) above, wherein the first side-surface wiring and the second side-surface wiring are electrically connectable.

[0110] The display device according to the present disclosure can have the following embodiments (14) and (15).

[0111] (14) A substrate having a display surface, a side surface connected to the display surface, and an opposite side surface opposite the side surface; A display unit located on the display surface; a side wiring located from the side surface to the display surface; an opposite side wiring located from above the opposite side to above the display surface; The display device, wherein the side wiring and the opposite side wiring are not positioned opposite to each other.

[0112] (15) The substrate includes wiring located on an edge portion of the side surface of the display surface, the wiring has an end surface on the side surface side located inside the side surface, The display device according to (14) above, wherein the end face is covered by the side wiring, or is covered by the side wiring and a protective layer covering the side wiring.

[0113] The multi-display according to the present disclosure can have the following embodiments (16) to (19).

[0114] (16) A display device according to (14) or (15) above is provided, The plurality of display devices include a first display device and a second display device; the side surface of the first display device and the opposite side surface of the second display device are disposed close to each other and opposed to each other; A multi-display, in which the side wiring of the first display device and the opposite side wiring of the second display device are not positioned opposite to each other.

[0115] (17) The multi-display according to (16) above, wherein the side wiring and the opposite side wiring are electrically connectable.

[0116] (18) The multi-display according to any one of (1) to (13) above, wherein the first display section and the second display section each include at least one light-emitting element.

[0117] (19) The multi-display according to (16) or (17) above, wherein the display unit includes at least one light-emitting element.

[0118] The multi-display of the present disclosure can prevent the side wiring provided on the side of the joint of each of the display device and the adjacent display device from coming into contact and electrically shorting. The side wiring provided on the side of the joint of each of the display device and the adjacent display device can be prevented from being scratched, broken, or peeled off due to contact, collision, etc. The gap (joint) between the display device and the adjacent display device can be reduced. As a result, the operational reliability and long-term reliability of the multi-display are improved, and the display quality is also improved. The display device of the present disclosure can produce the above multi-display with improved operational reliability, long-term reliability, and display quality.

[0119] Although each embodiment of the present disclosure has been described in detail above, the present disclosure is not limited to the above-described embodiments, and various modifications and improvements are possible within the scope of the gist of the present disclosure. It goes without saying that all or part of the components of each of the above-described embodiments can be appropriately combined within the scope of not being inconsistent. [Industrial Applicability]

[0120] The display device and multi-display of the present disclosure can be applied to various electronic devices, such as lighting devices, automobile route guidance systems (car navigation systems), ship route guidance systems, aircraft route guidance systems, indicators for vehicles such as automobiles, instrument panels, smartphone terminals, mobile phones, tablet terminals, personal digital assistants (PDAs), video cameras, digital still cameras, electronic organizers, electronic books, electronic dictionaries, personal computers, copiers, game terminals, televisions, product display tags, price display tags, industrial programmable display devices, car audio, digital audio players, facsimiles, printers, automated teller machines (ATMs), vending machines, medical display devices, digital display watches, smart watches, guidance display devices installed in stations and airports, and advertising signage (digital signage). [Explanation of symbols]

[0121] 200 Multi-display 1 1st display device 2 2nd display device 3. Substrate 31 First board 32 Second board 3a Display surface of the board 3a1 First display surface of first substrate 3a2 Second display surface of second substrate 3b Opposite side of the board 3b1: First opposite display surface of first substrate 3b2 Second opposite display surface of second substrate 3c Side of the board 3c1: First side surface of first substrate (joint side surface) 3c2 Side of the second board (non-bonding side) 3d Board other side 3d1: First opposite side of first substrate 3d2: Second side surface of the second substrate (second opposite side surface and joining portion side surface) 3e side 3f Side 4. Display unit of display device 4a First display unit of first display device 4b Second display unit of the second display device 5,51 1st side wiring 6,62 2nd side wiring 7 pixels 7p pixels (outermost pixels) 71, 71r, 71g, 71b Light emitting element 72 Pixel circuit 8 Insulating substrate 81, 82, 83 Insulating layer 84 Anode Electrode 85 Cathode Electrode 9,91,92 1st wiring (wiring) 9P Wiring precursor 9a end 9aa end face 9b Wiring pad 10 2nd wiring 10a end 10aa end face 10b Wiring pad 11 First protective layer 12 Second protective layer 13 Joining materials 14 Back wiring 15a First driving unit of first display device 15b Second driving section of second display device 16 Motherboard 16a One main surface 16b Other main surface 16c Cutting allowance 17 Base Board 17a One main surface 18 Test Pad 19 Side wiring 20 Side wiring 21 Protective layer D,D1 Display device DP Display Precursor

Claims

1. a first display device including a first substrate having a first display surface and a first side surface connected thereto, a first display section located on the first display surface, and first side surface wiring located from above the first side surface to above the first display surface; a second display device including a second substrate having a second display surface and a second side surface connected thereto, a second display unit located on the second display surface, and second side surface wiring located from above the second side surface to above the second display surface; The first side surface and the second side surface are disposed adjacent to each other and facing each other, A multi-display, wherein the first side wiring and the second side wiring are not positioned opposite each other.

2. the first side surface wiring is not in contact with the second side surface, The multi-display according to claim 1 , wherein the second side wiring is not in contact with the first side wiring.

3. The multi-display according to claim 1 , further comprising a first protective layer covering the first side wiring, and a second protective layer covering the second side wiring.

4. the first protective layer is not in contact with the second side surface, The multi-display according to claim 3 , wherein the second protective layer is not in contact with the first side surface.

5. the first protective layer covers the first side surface, The multi-display according to claim 3 , wherein the second protective layer covers the second side surface.

6. the first side wiring has an outer surface which is a convex curved surface, 6. The multi-display according to claim 1, wherein the second side surface wiring has an outer surface that is a convex curved surface.

7. The multi-display according to any one of claims 1 to 6, wherein the first side surface and the second side surface are joined via a joining member.

8. The multi-display according to claim 7 , wherein the joining member has a light-shielding property.

9. A base substrate is provided. The multi-display according to any one of claims 1 to 8, wherein the first display device and the second display device are fixed on the base substrate.

10. the first display unit and the second display unit are each configured such that a plurality of pixels, each including a light-emitting element and a pixel circuit that drives the light-emitting element, are arranged in a matrix on the first display surface and the second display surface, the first side surface wiring is at least partially located between pixels located close to the first side surface among a plurality of outermost pixels located on the outermost periphery of a matrix array in a plan view; A multi-display as described in any one of claims 1 to 9, wherein at least a portion of the second side wiring, when viewed in a planar view, is located between pixels located close to the second side among a plurality of outermost pixels located at the outermost periphery of a matrix-shaped array.

11. the first display device includes a first wiring connected to at least one of the plurality of pixels at an edge portion of the first side surface on the first display surface, the first wiring having a first end surface on the first side surface side located inside the first side surface, the first end surface being covered by the first side surface wiring or covered by the first side surface wiring and a first protective layer covering the first side surface wiring; The multi-display of claim 10, wherein the second display device has a second wiring connected to at least one of the plurality of pixels at an edge portion of the second side surface on the second display surface, and the second wiring has a second end face on the second side surface side located inside the second side surface, and the second end face is covered by the second side surface wiring or is covered by the second side surface wiring and a second protective layer covering the second side surface wiring.

12. The first display device and the second display device each include a first drive unit located on a first counter display surface opposite to the first display surface and a second drive unit located on a second counter display surface opposite to the second display surface, the first display device is configured such that at least one of the plurality of pixels is electrically connected to the first driving unit via the first side wiring; 12. The multi-display according to claim 10, wherein in the second display device, at least one of the plurality of pixels is electrically connected to the second drive section via the second side wiring.

13. 13. The multi-display according to claim 1, wherein the first side wiring and the second side wiring are electrically connectable to each other.

14. a substrate having a display surface, a side surface connected to the display surface, and an opposite side surface opposite the side surface; A display unit located on the display surface; a side wiring located from the side surface to the display surface; an opposite side wiring located from above the opposite side to above the display surface; The display device, wherein the side wiring and the opposite side wiring are not positioned opposite to each other.

15. the substrate includes wiring located at an edge portion of the side surface on the display surface, the wiring has an end surface on the side surface side located inside the side surface, The display device according to claim 14 , wherein the end face is covered by the side wiring, or is covered by the side wiring and a protective layer covering the side wiring.

16. A display device according to claim 14 or 15, The plurality of display devices include a first display device and a second display device; The side surface of the first display device and the opposite side surface of the second display device are disposed close to each other and opposed to each other, A multi-display, wherein the side wiring of the first display device and the opposite side wiring of the second display device are not positioned opposite to each other.

17. A multi-display as described in claim 16, wherein the side wiring of the first display device and the opposite side wiring of the second display device are electrically connectable.

18. The multi-display according to any one of claims 1 to 13, wherein the first display section and the second display section each include at least one light-emitting element.

19. The multi-display according to claim 16 or 17, wherein the display section includes at least one light-emitting element.

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