JP2018170339A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of accurately arranging a plurality of types of light emitting elements having different light emitting wavelengths at predetermined positions. SOLUTION: A substrate 1 and a plurality of types of positive electrodes 13Ra, 13Ga, 13Ba made of a magnetic material and negative electrodes 13Rb, 13Gb, 13Bb made of a magnetic material, which are installed on the substrate 1, and have different emission wavelengths, respectively. It has light emitting elements 3R, 3G, 3B, and the substrate 1 is connected to the positive electrodes 13Ra, 13Ga, 13Ba facing each other, and is connected to the positive electrode terminals made of a permanent magnetic material and the negative electrodes 13Rb, 13Gb, 13Bb. It is a display device having a negative electrode terminal made of a permanent magnetic material, which is connected to face each other, and a plurality of types of light emitting elements 3R, 3G, and 3B have the same contour shape in a plan view, and each type has the same contour shape. The arrangement configurations of the positive electrodes 13Ra, 13Ga, 13Ba and the negative electrodes 13Rb, 13Gb, 13Bb are different. [Selection diagram] Fig. 2

Description

  The present invention relates to a display device in which a plurality of light emitting elements such as light emitting diodes (LEDs) are provided on a substrate.

  2. Description of the Related Art Conventionally, a self-luminous display device that includes a plurality of pixel portions including light emitting elements such as LEDs and does not require a backlight device is known. A block circuit diagram of the basic configuration of such a display device is shown in FIG. The display device is a switching element for inputting a light emission signal to each of the light emitting elements 73 (LD11, LD12, LD13, LD21, LD22, LD23, LD31, LD32, LD33) on a substrate 51 made of a glass substrate or the like. Thin film transistor (TFT) 71 and a positive voltage (anode voltage: about 3 to 5 V) and a negative voltage (cathode) according to the level (voltage) of the light emission control signal (signal transmitting the image signal line SL). A light emitting portion (also referred to as a pixel portion) 74 (P11, P12, P13, P21) including a TFT 72 as a driving element for current-driving the light emitting element 73 from a potential difference (light emission signal) of voltage: about −3V to 0V. , P22, P23, P31, P32, P33-) are arranged in large numbers.

  The TFTs 71 and 72 are p-channel TFTs. When a low signal (L signal) is input to their gate electrodes, the source and the drain are brought into conduction, and an electric current flows. The light emission control signal is input to the gate electrode of the TFT 72, and a current (light emission signal) generated by a potential difference corresponding to the level of the light emission control signal is generated by the positive electrode (anode electrode) and the negative electrode of the light emitting element 73. It flows between (cathode electrodes). A positive voltage is input to the positive electrode of the light emitting element 73 via the positive voltage input line 75, and a negative voltage is input to the negative electrode of the light emitting element 73 via the negative voltage input line 76. A through conductor 78 formed of a through hole or the like is provided at the input end of the positive voltage input line 75, and is electrically connected to a driving element or a power supply unit on the back side of the substrate 51 through the through conductor 78. . A through conductor 79 made of a through hole or the like is provided at the input end of the negative voltage input line 76, and is electrically connected to a driving element or a power supply unit on the back side of the substrate 51 through the through conductor 79. . The TFT 72 is turned on while a low signal is input to the gate electrode, and a current flows through the light emitting element 73. In addition, a capacitive element is arranged on a connection line connecting the gate electrode and the source electrode of the TFT 72, and the capacitive element uses a period (1) until the next rewriting of the voltage of the light emission control signal input to the gate electrode of the TFT 72. It functions as a holding capacity to hold).

  Further, a plurality of gate signal lines 52 (GL1, GL2, GL3˜) formed in a first direction (for example, a row direction) on the substrate 51, and a second direction intersecting the first direction. A plurality of image signal lines (source signal lines) 53 (SL1, SL2, SL3˜) formed to intersect with the gate signal line 52 (for example, in the column direction), the gate signal line 52, and the image signal line 53 And a pixel portion 74 formed corresponding to each intersecting portion. In FIG. 9, reference numeral 70 denotes a display unit, and 61 denotes a through conductor made up of a through hole or the like for transmitting a gate signal from a driving element on the back side of the substrate 51. The drive element is mounted on the back surface of the substrate 51 by means such as a COG (Chip On Glass) method. In addition, a circuit board (Flexible Printed Circuit: FPC) for inputting / outputting a drive signal, a control signal, and the like to / from the drive element via a lead line may be provided on the back side of the substrate 51. .

  The TFTs 71 and 72 have a semiconductor film made of, for example, amorphous silicon (a-Si), low-temperature polycrystalline silicon (LTPS), and the like, and have three terminals of a gate electrode, a source electrode, and a drain electrode. It is possible to adopt a configuration in which both are n-channel TFTs, both are p-channel TFTs, and one is an n-channel TFT and the other is a p-channel TFT. Then, by applying a voltage of a predetermined potential to the gate electrode, it functions as a switching element (gate transfer element) that causes a current to flow through the semiconductor film (channel) between the source electrode and the drain electrode. When the substrate 51 is made of a glass substrate and the drive element is a drive circuit configured using a TFT having a semiconductor film made of LTPS, the TFT is formed on the substrate 51 by a thin film formation method such as a CVD (Chemical Vapor Deposition) method. Can be formed directly.

  In order to obtain a full-color display device, the pixel unit 74 as a light emitting unit may include a red light emitting subpixel, a green light emitting subpixel, and a blue light emitting subpixel. The sub pixel for red light emission has a red light emitting element such as a red LED, the sub pixel for green light emission has a green light emitting element such as a green LED, and the sub pixel for blue light emission consists of a blue LED or the like. It has a blue light emitting element. For example, these subpixels are arranged in the column direction.

  The light emission control signal is input from the through conductor 64 to each light emitting unit 74 via an image signal line (also referred to as a light emission control signal line) 53.

  FIG. 10 is an enlarged view of a portion C in FIG. 9, (a) is an enlarged plan view, and (b) is a sectional view taken along line D1-D2 in (a). As shown in FIG. 10, the light emitting element 73 includes a base 73b having one surface (front surface and light emitting portion installation surface) and the other surface (back surface) on the opposite side, and a light emitting portion 73a disposed on the one surface side. And a positive electrode 83a and a negative electrode 83b each made of a magnetic material for applying a driving voltage to the light emitting portion 73a, which are arranged on the other surface side. The substrate 51 has a positive electrode terminal 81a made of a permanent magnetic material and corresponding to the positive electrode 83a, and a negative electrode terminal 81b made of a permanent magnetic material and arranged in correspondence with the negative electrode 83b. ing. The positive electrode 83a and the positive electrode terminal 81a are connected via a conductive connecting member 82a made of solder or the like, and the negative electrode 83b and the negative electrode terminal 81b are connected via a conductive connecting member 82b made of solder or the like. . The positive electrode terminal 81a is connected to the positive voltage input line 75 via the wiring 85a and the TFT 2, and the negative electrode terminal 81b is connected to the negative voltage input line 76 via the wiring 85b.

  As another conventional example, in a display device formed by arranging light emitting elements on a substrate, a magnetic film is formed on the substrate and at the bottom of the light emitting elements, and the light emitting elements are formed on the substrate. In a display device in which light emitting elements are arrayed by being scattered and a display device in which light emitting elements are arrayed on a substrate, the light emitting elements are formed with different bottom shapes on the substrate. A display device is proposed in which a fitting portion that fits into the bottom of a light emitting element is formed, and a physical external force is applied to the substrate after the light emitting elements are simultaneously scattered on the substrate, and the light emitting elements are arranged by the physical external force. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 2003-216052

  However, the conventional display device shown in FIGS. 9 and 10 has the following problems. When a large number of light emitting elements 73 are arranged in each predetermined pixel, the number of pixels is as large as about 100,000 to about 1 million, and the shape and size of the light emitting element 73 in plan view are several on a side. Since it has a rectangular shape of about 10 μm to several 100 μm, there is a problem that it is difficult to accurately arrange a large number of extremely small light emitting elements 73 at predetermined positions. In addition, since the number of light emitting elements 73 used in one display device is very large, it takes a long time to install them on the substrate 51, and the workability and efficiency of manufacturing are extremely low. there were. Further, when a plurality of light emitting elements 73 that emit light of different wavelengths, for example, a red light emitting element, a green light emitting element, and a blue light emitting element are arranged in a predetermined subpixel, the number of subpixels is about several hundred thousand. The above problem has become more prominent because of the very large number of about ~ 1 million.

  The present invention has been completed in view of the above problems, and an object of the present invention is to provide a display device in which a plurality of types of light emitting elements having different emission wavelengths can be accurately arranged at predetermined positions. Another object is to provide a display device that can be manufactured with good workability and high manufacturing efficiency.

  The display device of the present invention includes a substrate and a plurality of types of light-emitting elements that are provided on the substrate and each have a positive electrode made of a magnetic material and a negative electrode made of a magnetic material, and having different emission wavelengths. And the substrate has a positive electrode terminal made of a permanent magnetic material and connected to the positive electrode, and a negative electrode terminal made of a permanent magnetic material and connected to the negative electrode. In the apparatus, the plurality of types of light emitting elements have the same outline shape in plan view, and the arrangement configuration of the positive electrode and the negative electrode is different for each type.

  In the display device of the present invention, it is preferable that the plurality of types of light emitting elements have an asymmetric shape in plan view.

  In the display device of the present invention, it is preferable that the plurality of types of light emitting elements are in positions where the positive electrodes do not overlap each other when the different types of light emitting elements are viewed in plan with overlapping outlines, and the negative electrodes overlap each other. It is in a position that cannot be.

  In the display device of the present invention, preferably, when each of the plurality of types of light-emitting elements installed on the substrate is viewed in plan, the positive electrode terminal is inside the positive electrode, and the negative electrode terminal Is inside the negative electrode.

  The display device of the present invention includes a substrate and a plurality of types of light-emitting elements that are provided on the substrate and each have a positive electrode made of a magnetic material and a negative electrode made of a magnetic material, and having different emission wavelengths. And the substrate has a positive electrode terminal made of a permanent magnetic material and connected to the positive electrode, and a negative electrode terminal made of a permanent magnetic material and connected to the negative electrode. The plurality of types of light-emitting elements have the same contour shape in plan view, and the arrangement configuration of the positive electrode and the negative electrode is different for each type. Play. Since a plurality of types of light emitting elements have different arrangement configurations of positive electrodes and negative electrodes for each type, a certain type of light emitting element is misplaced (missed) at a position where another type of light emitting element is to be disposed. Setting) can be effectively suppressed. Accordingly, a plurality of types of light emitting elements having different emission wavelengths are accurately arranged at predetermined positions. In addition, a display device can be manufactured with good workability and high manufacturing efficiency.

  In the display device according to the present invention, when the plurality of types of light emitting elements have an asymmetric shape in plan view, it becomes easy to confirm the directionality of the light emitting elements arranged on the substrate. It becomes easy to confirm the arrangement state of the positive electrode and the negative electrode of the element. Therefore, it is possible to more effectively suppress the occurrence of misplacement of the light emitting elements.

  In the display device of the present invention, when the plurality of types of light emitting elements are viewed in plan with different types of overlapping, the positive electrodes do not overlap each other and the negative electrodes do not overlap each other. In some cases, it is possible to more effectively suppress the misplacement of the light emitting elements.

  In the display device of the present invention, when each of the plurality of types of light-emitting elements installed on the substrate is viewed in plan, the positive electrode terminal is inside the positive electrode, and the negative electrode terminal is the negative electrode terminal. When it exists inside an electrode, it can suppress more effectively that incorrect arrangement | positioning of a light emitting element arises.

FIG. 1 is a diagram showing an example of an embodiment of a display device of the present invention, and is a plan view of a plurality of types of light emitting elements installed on a substrate. FIG. 2 is a plan view of the light-emitting device showing the arrangement of the positive and negative electrodes of each type of light-emitting element in the display device of FIG. FIG. 3 is a diagram showing another example of the embodiment of the display device of the present invention, and shows the arrangement of the positive electrode and the negative electrode of each type of light emitting element in a plurality of types of light emitting elements installed on the substrate. It is a top view of a light-emitting device. FIG. 4 is a diagram showing another example of the embodiment of the display device of the present invention, and shows the arrangement of the positive electrode and the negative electrode of each type of light-emitting element in a plurality of types of light-emitting elements installed on a substrate. It is a top view of a light-emitting device. FIG. 5 is a diagram showing another example of the embodiment of the display device of the present invention. In the configuration of FIG. 4, the relationship between the size and arrangement of the positive electrode and the positive electrode terminal of the light emitting element, the negative electrode and the negative electrode, It is a top view of the light-emitting device which shows the magnitude | size and arrangement | positioning relationship with an electrode terminal. 6A and 6B are diagrams showing a method for manufacturing the light-emitting device shown in FIG. 4, and FIG. 6A shows light emitted from the opening of the alignment jig for aligning and arranging the light-emitting elements. The top view which shows the light emitting element of the state which has inserted the element, (b) is sectional drawing in the A1-A2 line of (a). FIGS. 7A and 7B are views showing the light emitting element installed on the substrate by the manufacturing method of FIG. 6, and FIG. 7A is a plan view showing the light emitting element in a state where the alignment jig is removed. (B) is sectional drawing in the B1-B2 line of (a). FIG. 8 is a diagram relating to a method for manufacturing the light emitting device shown in FIG. 6, in which a plurality of light emitting elements are sprayed from above the alignment jig so that the light emitting elements are dropped and inserted into the openings of the alignment jig. It is sectional drawing which shows a manufacturing method. FIG. 9 is a block circuit diagram of a basic configuration of a conventional display device. FIG. 10 is an enlarged view of a portion C in FIG. 9, (a) is an enlarged plan view, and (b) is a sectional view taken along line D1-D2 in (a).

  Embodiments of a display device of the present invention will be described below with reference to the drawings. However, each drawing referred to below shows a main part for explaining the display device of the present invention among the constituent members in the embodiment of the display device of the present invention. Therefore, the display device according to the present invention may include known constituent members such as a circuit board, a wiring conductor, a control IC, and an LSI that are not shown in the drawing.

  FIGS. 1-8 is a figure which shows the example of various embodiment about the display apparatus of this invention. As shown in FIGS. 1 and 2, the display device of the present invention includes a substrate 1, a positive electrode 13Ra, 13Ga, 13Ba made of a magnetic material and a negative electrode 13Rb, 13Gb made of a magnetic material. Each of the light emitting elements 3R, 3G, and 3B has a light emission wavelength different from each other, and the substrate 1 is connected to be opposed to the positive electrodes 13Ra, 13Ga, and 13Ba, and is made of a permanent magnetic material. A positive electrode terminal (indicated by reference numerals of 11Ra, 11Ga, and 11Ba in FIG. 5) and a negative electrode terminal made of a permanent magnetic material and connected to the negative electrodes 13Rb, 13Gb, and 13Bb (in FIG. 5, of 11Rb, 11Gb, and 11Bb) The plurality of types of light emitting elements 3R, 3G, and 3B have the same outline shape in plan view, and each type has a positive power supply. 13Ra, 13Ga, 13Ba and the negative electrode 13Rb, 13Gb, a configuration in which arrangement of 13Bb are different. With this configuration, the plurality of types of light-emitting elements 3R, 3G, and 3B have different arrangements of the positive electrodes 13Ra, 13Ga, and 13Ba and the negative electrodes 13Rb, 13Gb, and 13Bb for each type. , It is possible to effectively suppress the occurrence of misplacement in which the light emitting element 3R) is disposed at a portion where another type of light emitting element (for example, the light emitting element 3G) is to be disposed. Therefore, for example, in one display device, 100,000 to several million small light emitting elements are accurately arranged at predetermined positions. In addition, a display device can be manufactured with good workability and high manufacturing efficiency.

  In the display device of the present invention, the substrate 1 may be a transparent substrate such as a glass substrate or a plastic substrate, but may be opaque. When the substrate 1 is opaque, the substrate 1 may be a colored glass substrate, a glass substrate made of frosted glass, a plastic substrate, a ceramic substrate, a metal substrate, or a composite substrate in which these substrates are laminated. The thickness of the substrate 1 is, for example, about 0.3 mm to 5 mm.

  As the light-emitting elements 3R, 3G, and 3B, any self-light-emitting element such as a microchip light-emitting diode (LED), a monolithic light-emitting diode, an organic EL, an inorganic EL, or a semiconductor laser element can be adopted.

  When the light-emitting element is a microchip light-emitting diode (LED), as shown in FIG. 6, the light-emitting element 3 has one surface (the surface and the light-emitting portion installation surface) and the other surface (the back surface) on the opposite side. A base 3b made of resin, ceramic, etc., a light emitting portion 3a arranged on one side, and a positive electrode made of a magnetic material for applying a driving voltage to the light emitting portion 3a arranged on the other side. An electrode 13a and a negative electrode 13b. The substrate 1 is disposed corresponding to the positive electrode 13a and has a positive electrode terminal 11a made of a permanent magnetic material, and a negative electrode terminal 11b made of a permanent magnetic material and arranged corresponding to the negative electrode 13b. ing. The positive electrode 13a and the positive electrode terminal 11a are connected via a conductive connecting member 12a made of solder or the like, and the negative electrode 13b and the negative electrode terminal 11b are connected via a conductive connecting member 12b made of solder or the like. . The positive electrode terminal 11a is connected to the positive voltage input line via the wiring 15a and the TFT, and the negative electrode terminal 11b is connected to the negative voltage input line via the wiring 15b.

  The positive electrode 13a made of a magnetic material and the negative electrode 13b made of a magnetic material are preferably made of a ferromagnetic material such as iron, cobalt, nickel, an alloy thereof, or ferrite. In this case, the attracting force due to the magnetic force between the positive electrode 13a and the positive electrode terminal 11a and the attracting force due to the magnetic force between the negative electrode 13b and the negative electrode terminal 11b are increased, and the arrangement of the light emitting element 3 is facilitated. Among the ferromagnetic materials, a soft magnetic material having a small coercive force is more preferable. For example, iron, silicon steel, permalloy, sendust, permendur, soft ferrite, amorphous magnetic alloy, nanocrystal magnetic alloy, and the like are preferable. The positive electrode 13a and the negative electrode 13b are formed on the substrate 3b by a thin film forming method such as vapor deposition, sputtering, or CVD (Chemical Vapor Deposition) using a ferromagnetic material. Alternatively, a paste containing ferromagnetic powder, resin, alcohol, water or the like is applied to a predetermined portion of the substrate 3b, dried and fired to form the substrate 3b.

  The positive electrode terminal 11a made of a permanent magnetic material and the negative electrode terminal 11b made of a permanent magnetic material are made of a hard magnetic material having a large coercive force and used as a permanent magnet, for example, an alnico magnetic material, a ferrite magnetic material, and a samarium cobalt magnetic material. , Neodymium iron boron magnetic material, samarium iron nitrogen magnetic material and the like. The positive electrode terminal 11a and the negative electrode terminal 11b are formed into a permanent magnetic block by applying an external magnetic field to the hard magnetic block, and the permanent magnetic block has a predetermined size and shape by a cutting method or the like. The terminal body is formed on the substrate 1 by fixing the terminal body on the substrate 1. Alternatively, an external magnetic field may be applied to the positive electrode terminal 11a and the negative electrode terminal 11b, which are formed in the same manner as the positive electrode 13a and the negative electrode 13b and are not made permanent magnetic, so that the permanent magnetic material can be obtained.

  A plurality of types of light emitting elements 3R, 3G, 3B having different emission wavelengths are, for example, a red light emitting element 3R (emission wavelength of about 660 nm), a green light emitting element 3G (emission wavelength of about 520 nm), and a blue light emitting element 3B. Although not limited to this, a yellow light emitting element, an amber light emitting element, a violet light emitting element, a white light emitting element, or the like may be used. The light emitting portion of the red light emitting element 3R is made of a material such as aluminum gallium arsenide (AlGaAs), gallium arsenide phosphorus (GaAsP), gallium phosphide (GaP), or a perovskite semiconductor. The light emitting part of the green light emitting element 3G includes indium gallium nitride (InGaN), gallium nitride (GaN), aluminum gallium nitride (AlGaN), gallium phosphide (GaP), zinc selenide (ZnSe), aluminum indium gallium phosphide ( (AlGaInP) and a perovskite semiconductor. The light emitting portion of the blue light emitting element 3B is made of a material such as indium gallium nitride (InGaN), gallium nitride (GaN), aluminum gallium nitride (AlGaN), or zinc selenide (ZnSe).

  As shown in FIG. 2, the light-emitting elements of the present invention have the same outline shape in plan view for each type of light-emitting elements 3R, 3G, 3B, and center points such as squares, rectangles, hexagons, circles, ellipses, etc. The shape may be point-symmetric with respect to P. In this case, for example, regarding the light emitting element 3R, it is preferable that the positive electrode 13Ra and the negative electrode 13Rb are not in a point-symmetrical position with respect to the center point P. This is because it is convenient when the light emitting element 3 is arranged at a predetermined position on the substrate 1 by the method of manufacturing the light emitting device shown in FIGS. In the manufacturing method shown in FIGS. 6 to 8, the light emitting elements 3 are scattered and inserted into the openings 20 a of the alignment jig 20 for aligning and arranging the light emitting elements 3. And when the planar view shape of the light emitting element 3 is a rectangle which is a point-symmetrical shape with respect to the center point P, there is no anisotropy in the directionality of the arrangement, and thus the light emitting element 3 may be arranged in the opposite direction. . That is, in FIG. 6B, the positive electrode 13a faces and is connected to the negative electrode terminal 11b, and the negative electrode 13b faces and is connected to the positive electrode terminal 11a. The voltage applied to is opposite in polarity to normal. However, as shown in FIG. 2, when the positive electrode 13Ra and the negative electrode 13Rb are not point-symmetric with respect to the center point P, even if the light emitting element 3R is inserted and arranged in the opposite direction to the opening 20a, It is possible to prevent the electrode 13Ra from being connected to the negative electrode terminal 11b and the negative electrode 13Rb from being connected to the positive electrode terminal 11a. Even if the light emitting element 3R is inserted and arranged in the opposite direction to the opening 20a, the positive electrode 13Ra does not oppose the negative electrode terminal 11b, so they are not attracted by magnetic force, and the negative electrode 13Rb opposes the positive electrode terminal 11a. They do not adsorb by magnetic force. As a result, the light emitting element 3R inserted and arranged in the reverse direction in the opening 20a can be easily removed from the substrate 1 by means such as vacuum suction means and means for dropping from the substrate 1.

  More preferably, neither the positive electrode 13Ra nor the negative electrode 13Rb is on the center line passing through the center point P and parallel to the side of the rectangle. In this case, even if the light emitting element 3R is inserted and arranged in the opposite direction to the opening 20a, the positive electrode 13Ra is not opposed to the negative electrode terminal 11b, and the negative electrode 13Rb is not opposed to the positive electrode terminal 11a. Can be done reliably.

  In the display device of the present invention, as shown in FIGS. 3 and 4, it is preferable that the plurality of types of light emitting elements 3R, 3G, and 3B have asymmetric shape in plan view. In this case, since it becomes easy to confirm the directionality of the light emitting elements 3R, 3G, 3B arranged on the substrate 1, the positive electrodes 13Ra, 13Ga, 13Ba and the negative electrodes 13Rb of the light emitting elements 3R, 3G, 3B, It becomes easy to confirm the arrangement state of 13Gb and 13Bb. Accordingly, it is possible to more effectively suppress the misplacement of the light emitting elements 3R, 3G, and 3B. Further, when the light emitting element 3 is arranged at a predetermined position on the substrate 1 by the method for manufacturing the light emitting device shown in FIGS. 6 to 8, the directionality of the arrangement of the light emitting elements 3R, 3G, 3B has anisotropy. Therefore, it is not arranged in the reverse direction. That is, the shape of the opening 20a of the alignment jig 20 is complementary to the planar view shape of the light emitting elements 3R, 3G, 3B, that is, the light emitting element 3R is similar to the planar view shape of the light emitting elements 3R, 3G, 3B. This is because the light emitting elements 3R, 3G, and 3B cannot be inserted in the reverse direction into the opening 20a because the shape is slightly larger than the planar view shape of 3G, 3B.

  Therefore, in the case of the light emitting elements 3R, 3G, and 3B shown in FIGS. 3 and 4, the positive electrodes 13Ra, 13Ga, and 13Ba and the negative electrodes 13Rb, 13Gb, and 13Bb may be in point-symmetrical positions with respect to the center point P. .

  The light emitting elements 3R, 3G, and 3B shown in FIG. 3 have a trapezoidal shape in plan view, and are symmetrical with respect to the vertical center line passing through the center point P. The shape is asymmetric with respect to the direction center line. Thus, it is sufficient that the shape is asymmetric in a certain direction, and the light emitting elements 3R, 3G, 3B can be prevented from being inserted into the opening 20a in the opposite direction. However, the light emitting elements 3R, 3G, and 3B shown in FIG. 3 can be turned upside down and inserted into the opening 20a. In this case, the light emitting elements 3R, 3G, and 3B turned upside down and inserted into the opening 20a are attracted by magnetic force. Since it is not done, it can be easily removed from the substrate 1.

  The light-emitting elements 3R, 3G, and 3B shown in FIG. 4 have a rectangular shape in which a protrusion 3c (shown in FIGS. 6 and 7) is added to a rectangle, and the planes of the light-emitting elements 3R, 3G, and 3B A shape that can reliably impart asymmetry to the visual shape is preferable. That is, asymmetry can be reliably imparted to the planar view shapes of the light emitting elements 3R, 3G, and 3B by imparting a slight protrusion to a point-symmetric shape such as a square, rectangle, hexagon, or circle. The protrusion may be a recess.

  As shown in FIGS. 2 to 4, the display device according to the present invention has a plurality of types of light emitting elements 3 </ b> R, 3 </ b> G, and 3 </ b> B having positive electrodes 13 </ b> Ra, 13 </ b> Ga, It is preferable that 13Ba is in a position where they do not overlap each other, and the negative electrodes 13Rb, 13Gb, 13Bb are in a position where they do not overlap each other. In this case, it is possible to more effectively suppress the misplacement of the light emitting elements 3R, 3G, and 3B. For example, even if the light emitting element 3R is mistakenly disposed at a position where the light emitting element 3G is to be disposed, the positive electrode 13Ra and the positive electrode terminal 11a of the light emitting element 3R are not opposed to each other, so that they are not adsorbed by magnetic force, and the negative electrode Since 13Rb and the positive electrode terminal 11b do not face each other, they are not attracted by magnetic force. As a result, the misplaced light emitting element 3R can be easily removed.

  As shown in FIG. 5, in the display device of the present invention, the positive electrode terminals 11Ra, 11Ga, and 11Ba are positive when the plurality of types of light-emitting elements 3R, 3G, and 3B installed on the substrate 1 are viewed in plan. It is preferable that the electrodes 13Ra, 13Ga, and 13Ba are inside, and the negative electrode terminals 11Rb, 11Gb, and 11Bb are inside the negative electrodes 13Rb, 13Gb, and 13Bb. In this case, it is possible to more effectively suppress the misplacement of the light emitting elements 3R, 3G, and 3B. That is, the range in which the magnetic force of the positive electrode terminals 11Ra, 11Ga, and 11Ba is narrowed and the range of the magnetic force in the negative electrode terminals 11Rb, 11Gb, and 11Bb is narrowed. Even if it is mistakenly arranged, it is possible to more reliably prevent the light emitting element 3R from being attracted by a magnetic force.

  The manufacturing method of the display device of the present invention shown in FIGS. 6 to 8 has the following configuration. A plurality of light emitting element installation regions including a positive electrode terminal 11a and a negative electrode terminal 11b are disposed on the upper surface side, and are disposed above the upper surface of the substrate 1, and have a shape complementary to the planar view shape of the light emitting element 3. A first step of preparing an alignment jig 20 in which a plurality of openings 20a are formed corresponding to each of the light emitting element installation regions, and the light emitting element 3 and the positive electrode 13a in each of the plurality of openings 20a. And the positive electrode terminal 11a and the negative electrode 13b and the negative electrode terminal 11b are inserted in a second state, the positive electrode 13a and the positive electrode terminal 11a, the negative electrode 13b and the negative electrode terminal 11b, It is the structure which has a 3rd process connected through the electroconductive connection members 12a and 12b, respectively. With this configuration, for example, a large number of small light emitting elements 3 ranging from 100,000 to several million can be accurately arranged at predetermined positions, respectively. Therefore, the display device can be manufactured with good workability and high manufacturing efficiency.

  As shown in FIG. 8, the light emitting element 3 is inserted into each of the plurality of openings 20a in a state where the positive electrode 13a and the positive electrode terminal 11a face each other and the negative electrode 13b and the negative electrode terminal 11b face each other. In the second step, it is preferable that the same number or more of the light emitting elements 3 as the number of the openings 20 a be dispersed from above the alignment jig 20. In this case, since the light emitting element 3 inserted into the opening 20a is adsorbed by magnetic force, it is not removed from the substrate 1, and the light emitting element 3 not inserted into the opening 20a is not adsorbed by magnetic force. Can be easily removed from. In order to insert and arrange a plurality of types of light emitting elements 3R, 3G, and 3B in the opening 20a, first, for the light emitting element 3 having a predetermined emission wavelength, for example, the light emitting element 3R, in the second step, a spreading process and a removing process are performed. In some cases, the spraying step and the removing step are repeated and inserted into all the openings 20a for the light emitting element 3R. Next, the light emitting elements 3 having different emission wavelengths, for example, the light emitting element 3G, are similarly inserted and arranged in all the openings 20a for the light emitting elements 3G. Next, light emitting elements 3 having different emission wavelengths, for example, the light emitting element 3B, are similarly inserted and arranged in all the openings 20a for the light emitting element 3B. Then, as shown in FIG. 7, the alignment jig 20 is removed, and the conductive connecting members 12a and 12b are melted and solidified by passing the substrate 1 through a reflow apparatus, so that all the light emitting elements 3R, 3G, and 3B are assembled. It is installed on the substrate 1. With this configuration, the operation of inserting one light emitting element 3 into each opening 20a is omitted, so that a display device can be manufactured with better workability and higher manufacturing efficiency.

  In the above method for manufacturing a display device, a plurality of types of alignment jigs 20 may be used to manufacture the display device. For example, three kinds of alignment jigs 20 for arranging the light emitting elements 3R, 3G, 3B may be used, and the alignment jig 20 for arranging the light emitting elements 3R, 3G and the light emitting element 3B. Two types of alignment jigs 20, i.e., alignment jigs 20 for disposing the components, may be used. For example, when the three kinds of alignment jigs 20 for arranging the light emitting elements 3R, 3G, and 3B are the alignment jigs 20R, 20G, and 20B, first, the light emitting element 3R is used by using the alignment jig 20R. Is disposed on the substrate 1, the alignment jig 20R is removed from above the substrate 1, the light emitting element 3G is disposed on the substrate 1 using the alignment jig 20G, and the alignment jig 20G is disposed above the substrate 1. It is possible to employ a manufacturing method in which the light emitting element 3B is disposed on the substrate 1 by using the alignment jig 20B.

  When a multi-display is manufactured using the display device of the present invention, a plurality of substrates 1 on which a plurality of types of light emitting elements 3R, 3G, 3B are mounted are arranged vertically and horizontally on the same surface, and the side surfaces are bonded to each other. By combining (tiling) with a connecting conductor or the like, a composite and large multi-display can be obtained.

  The display device of the present invention is not limited to the above-described embodiment, and appropriate changes and improvements may be made. For example, a light receiving element such as a photodiode may be installed on the substrate with basically the same structure as the light emitting element in the display device of the present invention. In that case, a touch panel using the light receiving element for the display device, fingerprint authentication, etc. Can be added. For example, a light receiving element having the same configuration as the light emitting element 3 except that the light emitting part 3a is changed to a light receiving part is added to the light emitting elements 3R, 3G, and 3B as a fourth type element by the above-described manufacturing method. What is necessary is just to install on a board | substrate.

  The display device of the present invention can be applied to various electronic devices. The electronic devices include a composite and large multi-display, an automobile route guidance system (car navigation system), a ship route guidance system, an aircraft route guidance system, a smartphone terminal, a mobile phone, a tablet terminal, a personal digital assistant (PDA), Video cameras, digital still cameras, electronic notebooks, electronic books, electronic dictionaries, personal computers, copying machines, terminal devices for game machines, televisions, product display tags, price display tags, industrial programmable display devices, car audio, digital There are various indicators such as an audio player, a facsimile, a printer, an automatic teller machine (ATM), a vending machine, a digital display wristwatch, a smart watch, a direction indicator, and a traffic light.

DESCRIPTION OF SYMBOLS 1 Board | substrate 3, 3R, 3G, 3B Light emitting element 3a Light emission part 3b Base | substrate 3c Protrusion part 11a, 11Ra, 11Ga, 11Ba Positive electrode terminal 11b, 11Rb, 11Gb, 11Bb Negative electrode terminal 12a, 12b Conductive connection member 13a, 13Ra, 13Ga, 13Ba Positive electrode 13b, 13Rb, 13Gb, 13Bb Negative electrode 20 Positioning jig 20a Opening

Claims (4)

A substrate,
A plurality of types of light-emitting elements, each having a positive electrode made of a magnetic material and a negative electrode made of a magnetic material and having different emission wavelengths, installed on the substrate;
The substrate is a display device having a positive electrode terminal made of a permanent magnetic material and connected to the positive electrode, and a negative electrode terminal made of a permanent magnetic material and connected to the negative electrode. There,
The plurality of types of light-emitting elements have the same outline shape in plan view, and the arrangement configuration of the positive electrode and the negative electrode is different for each type.   2. The display device according to claim 1, wherein the plurality of types of light emitting elements have an asymmetric shape in plan view.   3. The plurality of types of light emitting elements are located at positions where the positive electrodes do not overlap each other and the negative electrodes do not overlap each other when the different types of light emitting elements are viewed in plan with overlapping outlines. The display device described in 1.   The positive electrode terminal is inside the positive electrode and the negative electrode terminal is inside the negative electrode when each of the plurality of types of light emitting elements installed on the substrate is viewed in plan. The display device according to any one of claims 3 to 3.