Display device, decorative sheet, and method for manufacturing the display device

Abstract

A display device configured so as to display a design in which wood grain, etc., is harmonized with surroundings while inactive, wherein any decrease in the brightness and quality of an image is suppressed. Therefore, this display device (101) comprises a base material (1), a printed layer (2) formed on the surface of the base material (1), a plurality of light-emitting units (3) composed of inorganic LED elements secured to the surface of the printed layer (2), and a control unit (101b) for driving the plurality of light-emitting units (3), a pictorial pattern harmonious with surroundings where the display device (101) is installed being used as the pictorial design of the printed layer (20), and an observer being caused to view the printed layer (2) while the display device (101) is inactive and view a luminous display image produced through light emission by the light-emitting units (3) while the display device (101) is active. Because all amounts of luminance of the plurality of light-emitting units (3) reach the observer without being significantly reduced, it is possible to suppress any decrease in the brightness of images and consequently suppress any decrease in image quality.

Description

Technical Field

[0001] The present invention relates to a display device, a decorative sheet, and a method for manufacturing a display device.

Background Art

[0002] A display device provided with a sheet having light transmissivity and design on the surface of a light-emitting display body can visually recognize characters, figures, symbols, etc. displayed on the light-emitting display body when the light-emitting display body is operating and emitting light, because the light from the light-emitting display body passes through the sheet. On the other hand, when the light-emitting display body is stopped, the sheet covers the light-emitting display body, so that the light-emitting display body cannot be recognized, and a design that harmonizes with the surroundings can be achieved (see, for example, Patent Documents 1 and 2 below).

[0003] As such a display device, for example, as shown in FIG. 21, a color adjustment layer 113, a pattern layer 114, and a surface protection layer 115 are sequentially provided on a sheet-like base material 112 made of resin or the like, and a sheet in which a large number of fine light passage holes 110a are formed by laser light, a drill, or the like is provided on the surface of a light-emitting display body 111 such as a liquid crystal display. In this display device 110, when the light-emitting display body 111 is operating and emitting light, the display of the light-emitting display body 111 can be recognized because light passes through the light passage holes 110a of the sheet. On the other hand, when the light-emitting display body 111 is stopped, the sheet covers the light-emitting display body 111, so that the light-emitting display body 111 cannot be recognized, and a design that harmonizes with the surroundings can be achieved.

[0004] Further, for example, as shown in FIG. 22, a sheet in which a pattern layer 122, a color adjustment layer 123, a pattern layer 124, and a surface protection layer 125 are laminated in an array by a printing method so as to form a large number of fine voids (holes) 120a through which light passes on a light-transmissive sheet-like base material 121 made of resin or the like is provided on the surface of the light-emitting display body 111. In this display device 120, when the light-emitting display element 111 is operating and emitting light, the light passes through the gap 120a in the sheet, allowing the display of the light-emitting display element 111 to be recognized. On the other hand, when the light-emitting display element 111 is not operating, the sheet covers the light-emitting display element 111, making it impossible to recognize the light-emitting display element 111, thus creating a design that harmonizes with the surroundings. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2018-128581 [Patent Document 2] Patent No. 6370519 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, in the display devices 110 and 120 described above, a sheet with numerous light-passing holes 110a or a sheet formed on a light-transmitting sheet-like substrate 121 with numerous fine voids (holes) 120a that allow light to pass through is provided on the surface of the light-emitting display body 111. As a result, of the light emitted by the light-emitting display body 111, the light that passes through the light-passing holes 110a or voids (holes) 120a reaches the observer viewing the display devices 110 and 120. Therefore, the amount of light emitted by the light-emitting display body 111 that actually reaches the observer is reduced, which may lead to a decrease in the brightness and image quality of the image seen by the observer.

[0007] Therefore, this invention has been made in view of the unresolved problems of the past, and aims to provide a display device, a decorative sheet, and a method for manufacturing a display device that can suppress a decrease in the brightness and quality of an image in a display device that displays content displayed by the display device when the display device is in operation and displays a predetermined image such as wood grain when the display device is not in operation. [Means for solving the problem]

[0008] According to one aspect of the present invention, a display device is provided comprising a substrate, a pattern layer formed on the surface of the substrate, a plurality of light-emitting units each consisting of an inorganic LED element fixed to the surface of the pattern layer, and a control unit for driving the plurality of light-emitting units. Furthermore, according to another aspect of the present invention, a display device is provided comprising a light-transmitting substrate, a pattern layer formed on the back surface of the substrate, a plurality of light-emitting units each consisting of an inorganic LED element formed on the surface of the substrate, and a control unit for driving the plurality of light-emitting units. Furthermore, according to another aspect of the present invention, a display device is provided comprising: a colored sheet; a plurality of light-emitting units each consisting of an inorganic LED element fixed to the surface of the colored sheet; a light-transmitting surface protective layer provided to cover the plurality of light-emitting units and the surface to which the plurality of light-emitting units are fixed; a pattern-applying layer provided on the surface of the surface protective layer facing the light-emitting units, which provides a pattern to the light from the plurality of light-emitting units and transmits it; and a control unit for driving the light-emitting units.

[0009] Furthermore, according to another aspect of the present invention, a decorative sheet is provided which is equipped with a display device as described above, wherein the display device is provided on a part of the surface of the decorative sheet. Furthermore, according to another aspect of the present invention, a method for manufacturing a display device is provided, comprising forming circuit wiring on the surface of a substrate, forming an ink layer on the surface of the substrate including the circuit wiring to reduce the visibility of the display device's mounting surface, the substrate, and the circuit wiring, and then, after forming the ink layer, installing a light-emitting part on the surface of the substrate. [Effects of the Invention]

[0010] According to one aspect of the present invention, a display device that displays content displayed by the display device when the display device is in operation, and displays a predetermined light-emitting image such as wood grain when the display device is not in operation, can suppress a decrease in the brightness and quality of the light-emitting image. [Brief explanation of the drawing]

[0011] [Figure 1]It is a schematic configuration diagram showing an example of a display device according to an embodiment of the present invention. [Figure 2] It is a cross-sectional view showing a schematic configuration of an example of a display unit according to the first embodiment. [Figure 3] It is a cross-sectional view showing a schematic configuration of a modified example of the display unit according to the first embodiment. [Figure 4] It is a cross-sectional view showing a schematic configuration of an example of a display unit according to the second embodiment. [Figure 5] It is a cross-sectional view showing a schematic configuration of a modified example of the display unit according to the second embodiment. [Figure 6] It is a cross-sectional view showing a schematic configuration of an example of a display unit according to the third embodiment. [Figure 7] It is a cross-sectional view showing a schematic configuration of a modified example of the display unit according to the third embodiment. [Figure 8] It is a cross-sectional view showing a schematic configuration of a modified example of the display unit according to the third embodiment. [Figure 9] It is a cross-sectional view of the display unit of FIG. 8 as viewed from the direction in which the circuit wiring extends. [Figure 10] It is a cross-sectional view showing a schematic configuration of a modified example of the display unit according to the third embodiment. [Figure 11] It is a cross-sectional view of the display unit of FIG. 10 as viewed from the direction in which the circuit wiring extends. [Figure 12] It is an explanatory diagram for explaining a modified example of the display unit according to the third embodiment. [Figure 13] It is a cross-sectional view showing a schematic configuration of a modified example of the display unit according to the third embodiment. [Figure 14] It is a cross-sectional view of the display unit of FIG. 13 as viewed from the direction in which the circuit wiring extends. [Figure 15] It is a cross-sectional view showing a schematic configuration of an example of a display unit according to the fourth embodiment. [Figure 16] It is a cross-sectional view showing a schematic configuration of a modified example of the display unit according to the fourth embodiment. [Figure 17] It is a cross-sectional view showing a schematic configuration of an example of a display unit according to the fifth embodiment. [Figure 18] It is a cross-sectional view showing a schematic configuration of a modified example of the display unit according to the fifth embodiment. [Figure 19] It is an explanatory diagram showing an example of a display unit according to the seventh embodiment. [Figure 20] It is an explanatory diagram for explaining circuit wiring according to the eighth embodiment. [Figure 21] It is a cross-sectional view showing a schematic configuration of an example of a conventional display device. [Figure 22] It is a cross-sectional view showing a schematic configuration of an example of a conventional display device.

Mode for Carrying Out the Invention

[0012] Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thicknesses of the respective layers, etc. are different from the actual ones. Also, there are portions where the dimensional relationships and ratios are different between the drawings. Further, the embodiments shown below illustrate devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention does not specify the arrangement of components, etc. as the following. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

[0013] 〔First Embodiment〕 First, a display device 101 according to the first embodiment of the present invention will be described. 〔Configuration〕 FIG. 1 is a schematic configuration diagram showing an example of a display device 101 according to the first embodiment, and FIG. 2 is a part of a cross-sectional view taken along the A - A' cross-section of a later-described display unit 101a shown in FIG. 1. In FIG. 1, for the sake of clarity, a later-described surface protection layer 5 is not shown. Also, in FIG. 2, for the sake of clarity, the number of later-described light-emitting units 3 does not correspond to that in FIG. 1. The display device 101 includes a display unit 101a and a control unit 101b that drives and controls the display unit 101a.

[0014] As shown in Figure 2, the display unit 101a comprises a sheet-like substrate 1, a printed layer (pattern layer) 2 printed on the surface of the substrate 1, a plurality of light-emitting units 3 fixed to the surface of the printed layer 2, circuit wiring 4 for driving the light-emitting units 3 fixed to the surface of the printed layer 2, and a surface protection layer 5 provided to cover the printed layer 2, the light-emitting units 3, and the circuit wiring 4. The base material 1 is formed from, for example, a resin film. The base material 1 is not limited to a resin film, and any material can be used. For example, if a relatively lightweight material such as a film is used as the base material 1, the overall weight of the display device 101 can be reduced, and thus a display device 101 with a relatively large screen can be realized. In addition, the placement position of the display device 101 is less constrained by the overall weight of the display device 101, thus improving versatility. Furthermore, the base material 1 may be rectangular as shown in Figure 1, or it may be any shape.

[0015] The printed layer 2 is formed by printing and coating various patterns such as wood grain or marble with ink. The pattern of the printed layer 2 is designed to harmonize with the location where the display device 101 is installed. By having such a design, the display device 101 harmonizes with its surroundings when the light-emitting part 3 is not emitting light. The printed layer 2 is not limited to being printed and coated, and may be formed by any method that provides a design that harmonizes with its surroundings.

[0016] The light-emitting unit 3 consists of, for example, a 3-in-1 chip-type surface-mount LED element in which three LED elements corresponding to each of the RGB colors are combined into one. Multiple light-emitting units 3 are arranged in a row-and-column alignment, i.e., arranged in a matrix. Inorganic LEDs, such as microLEDs, can be used as the LED elements constituting the light-emitting unit 3. The light-emitting unit 3 is not limited to a 3-in-1 chip type element; separate LED elements for RGB may be provided. Furthermore, it is not limited to surface-mount LED elements; any inorganic LED element can be used. The size and shape of the inorganic LED elements constituting the light-emitting unit 3 should be set according to the installation position of the display unit 101a, the distance between the observer viewing the display content of the display unit 101a and the display unit 101a, the size of the display unit 101a, and the image quality and brightness of the emitted image required for the display device 101. Also, the light-emitting unit 3 does not need to be color; it may be monochrome.

[0017] In Figure 1, the light-emitting units 3 are arranged in rows and columns across the entire front surface of the substrate 1. However, the light-emitting units 3 may be provided only in the locations necessary for displaying characters or other information. Furthermore, to ensure versatility and to avoid differences in the color of the display unit 101a visible to the observer depending on the presence or absence of the light-emitting units 3, the light-emitting units 3 may be arranged in a line across the entire front surface of the substrate 1, with only the light-emitting units 3 necessary for displaying characters or other information connected to the circuit wiring 4, and the other light-emitting units 3 left unconnected to the circuit wiring 4 and positioned as dummies.

[0018] As shown in Figure 1, the circuit wiring 4 is arranged on both sides of the aligned row-oriented light-emitting units 3. The circuit wiring 4 for supplying signals or power to each inorganic LED element included in each light-emitting unit 3 is connected to the control unit 101b, and the inorganic LED elements included in each light-emitting unit 3 are driven and controlled by the control unit 101b. Note that the driving method for the inorganic LED elements is not limited to this, and other methods commonly used as driving methods for LED displays can also be applied. Furthermore, the placement of the circuit wiring 4 is not limited to the placement positions shown in Figure 1, but can be placed at any position.

[0019] The surface protection layer 5 is made of, for example, a colorless or colored transparent resin and has light transmittance, protecting the light-emitting part 3 and the printed layer 2. The surface protection layer 5 may be in the form of a sheet, or a coating film may be formed by printing and applying resin to the entire surface including the light-emitting part 3 and the printed layer 2. The surface protection layer 5 may also have a coating layer on its surface for gloss adjustment or the like. Furthermore, as shown in Figure 2, the surface protection layer 5 may be provided on the light-emitting surface side of the light-emitting unit 3, while maintaining a gap between the light-emitting unit 3 and the surface protection layer 5, in order to dissipate heat from the light-emitting unit 3. Alternatively, the gaps between the light-emitting units 3 may be filled with a filler or the like, and the surface protection layer 5 may be placed on top of that.

[0020] [Manufacturing method] Next, the manufacturing method of the display device 101 will be described. First, ink is printed onto the surface of the substrate 1 to form a printed layer 2. Next, the light-emitting part 3 and the circuit wiring 4 are fixed and electrically connected on the printed layer 2. The method of fixing and connecting the light-emitting part 3 and the circuit wiring 4 is not particularly limited, but for example, the circuit wiring is printed in a pattern using conductive ink containing metals such as silver or copper, and the light-emitting part 3 is electrically connected and fixed in a predetermined position using a conductive material such as solder by a method such as thermocompression bonding. Next, a surface protective layer 5 is provided by printing or applying a colorless or colored transparent ink to the entire front surface of the substrate 1, or by laminating a colorless or colored transparent resin, etc., so as to cover the light-emitting part 3, the circuit wiring 4, and the printed layer 2. This forms the display part 101a. Then, the display device 101 can be manufactured by electrically connecting the circuit wiring 4 and the control unit 101b.

[0021] [Effect] Next, the operation of the display device 101 will be explained. When an observer visually inspects the surface of the display unit 101a on which the light-emitting unit 3 is located (hereinafter also referred to as the light-emitting display surface), the control unit 101b drives the light-emitting unit 3 to emit light, allowing the observer to see the illuminated image, such as characters or figures, through the surface protective layer 5. At this time, the observer's field of view includes the light-emitting unit 3, the printing layer 2, and the circuit wiring 4 through the surface protective layer 5. However, the illuminated image from the light-emitting unit 3 is easier for the observer to see than the non-illuminating printing layer 2, and the light emitted from the light-emitting unit 3 makes it difficult to recognize the printing layer 2. Therefore, the illuminated image displayed by the light-emitting unit 3 is easier for the observer to see, and the observer can recognize the illuminated image. In particular, since all the light emitted by all the light-emitting units 3 passes only through the surface protective layer 5 and reaches the observer, the amount of light emitted by the light-emitting unit 3 that reaches the observer is only about the amount of reduction when passing through the surface protective layer 5, and the remaining light reaches the observer. Therefore, the observer can view the light-emitting image from the light-emitting unit 3 with a brightness reduced by an amount equivalent to the reduction when passing through the surface protective layer 5, resulting in relatively bright and good image quality. In this way, the reduction in brightness of the light-emitting image viewed by the observer is small, which conversely makes the printed layer 2 difficult to see, resulting in even better image quality.

[0022] On the other hand, when the control unit 101b stops the light emission of the light-emitting unit 3, the light-emitting unit 3, the printed layer 2, and the circuit wiring 4 are included in the field of view of the observer who is visually inspecting the illuminated display surface, through the surface protective layer 5. However, the light-emitting unit 3 and the circuit wiring 4, which are not emitting light, will appear to the observer as linear objects without meaning, or they may be difficult for the observer to see depending on the size of the light-emitting unit 3 and the distance from the observer. Conversely, the printed layer 2 has various patterns such as wood grain and marble, so it appears to the observer as a pattern. Therefore, the printed layer 2 becomes easier for the observer to see than the light-emitting unit 3 and the circuit wiring 4, and the display unit 101a has a design that harmonizes with its surroundings.

[0023] 〔effect〕 (1) By arranging the light-emitting unit 3 on the printed layer 2 and covering the light-emitting unit 3 and the printed layer 2 with a surface protective layer 5, the amount of light emitted from the light-emitting unit 3 that is reduced before reaching the observer can be limited to the amount of reduction due to transmission through the surface protective layer 5, allowing the observer to view the emitted image with relatively bright and good image quality. (2) This can be achieved by providing a printed layer 2 on the surface of a sheet-like substrate 1 and fixing the light-emitting part 3 and circuit wiring 4 to the surface of the printed layer 2, thus making the overall weight of the display device 101 lighter. For this reason, even a display device 101 with a relatively large screen, such as a large screen, can be easily realized.

[0024] (3) The display unit 101a can be made relatively thin and lightweight, so the display device 101 can be easily installed, and can be installed in the same way as wallpaper. Also, because the display unit 101a is relatively easy to deform, it can be easily placed on curved surfaces and other non-flat surfaces. Furthermore, because it is easy to handle in this way, any size of display unit 101a can be easily installed, from a display unit 101a with a relatively large screen such as a large screen to a display unit 101a with a relatively small screen such as an interior panel or table in a vehicle. (4) An inorganic LED element is used as the light-emitting part 3. An inorganic LED element is a point-emitting element and can be used for a long period of time with higher brightness compared to organic EL, so it is possible to achieve both improved brightness of the emitted image and durability when displaying an emitted image.

[0025] [Variation] In the display unit 101a, a printed layer 2 is provided on the surface of the substrate 1 as shown in Figure 2. However, as shown in the display unit 101aa in Figure 3, the printed layer 2 may be provided on the back surface of the substrate 1, and the light-emitting unit 3 and circuit wiring 4 may be fixed to the surface of the substrate 1. In this case, the substrate 1 is preferably made of a colorless or colored transparent material, such as a colorless or colored transparent resin film. Figure 3 is a cross-sectional view of the display unit 101aa when it is cut, corresponding to the same part as in Figure 2. Furthermore, although the display units 101a and 101aa are provided with a surface protection layer 5, the surface protection layer 5 is not necessarily required when the display device 101 is installed in an environment where it is not necessary to protect the light-emitting unit 3, etc., such as indoors.

[0026] [Second Embodiment] Next, a display device according to a second embodiment of the present invention will be described. As shown in Figure 4, the display device according to this second embodiment differs from the display device 101 according to the first embodiment in the configuration of the display unit 101a. The same reference numerals are used for the display unit 101a and its corresponding parts, and their detailed descriptions are omitted. Figure 4 is a cross-sectional view of the same part as in Figure 2, and is a part of the cross-sectional view when the display unit 102a, which will be described later, is cut. In other words, the display unit 102a of the display device according to the second embodiment, similar to the display unit 101a according to the first embodiment, has a printed layer 2 printed on the surface of the substrate 1, a light-emitting unit 3 and circuit wiring 4 fixed to the surface of the printed layer 2, and a shaping sheet 5a is provided so as to cover the printed layer 2, the light-emitting unit 3 and the circuit wiring 4. The shaping sheet 5a is made of a colorless or colored transparent resin and has light transmittance, and a plurality of recesses are formed on the surface of the shaping sheet 5a opposite to the surface facing the light-emitting unit 3. In this case, recesses are formed on the shaping sheet 5a, but protrusions may be formed, or both recesses and protrusions may be formed.

[0027] In this way, by using the shaping sheet 5a as the surface protective layer 5, the light-emitting display surface of the display unit 102a can be given a design feature such as an uneven shape, and the harmony between the display unit 102a and its surroundings when the light-emitting unit 3 is not emitting light can be further improved. In the display unit 102a, a printed layer 2 is provided on the surface of the base material 1 as shown in Figure 4. However, as shown in the display unit 102aa in Figure 5, the printed layer 2 may be provided on the back surface of the base material 1, and the light-emitting unit 3 and circuit wiring 4 may be fixed to the surface of the base material 1. In this case, the base material 1 is preferably made of a colorless or colored transparent material, such as a colorless or colored transparent resin film. Figure 5 is a cross-sectional view of the display unit 102aa when it is cut, corresponding to the same part as in Figure 2.

[0028] [Third Embodiment] Next, a display device according to a third embodiment of the present invention will be described. As shown in Figure 6, the display device according to this third embodiment differs from the display device 101 according to the first embodiment in the configuration of the display unit 101a. The same reference numerals are used for the display unit 101a and its corresponding parts, and their detailed descriptions are omitted. Figure 6 is a cross-section corresponding to the same part as in Figure 2, and is a part of the cross-sectional view when the display unit 103a, which will be described later, is cut. In the display unit 103a of the third embodiment of the display device, a colored sheet 1a is used instead of a base material 1, and the light-emitting unit 3 and circuit wiring 4 are fixed to the surface of the colored sheet 1a. Furthermore, a pattern printing layer 6 is printed on the side of the shaping sheet 5a used in Figure 4 that is opposite to the side on which the shaping is formed, and the shaping sheet 5a is arranged so as to cover the light-emitting unit 3, circuit wiring 4 and colored sheet 1a, with the pattern printing layer 6 and the light-emitting unit 3 facing each other. The shaping sheet 5a may be arranged so as to be in contact with the pattern printing layer 6 and the light-emitting unit 3, or it may be arranged so that there is a gap between them.

[0029] The colored sheet 1a is preferably a color that complements the color tone of the pattern on the pattern printing layer 6, such as white or silver. In other words, even when the light-emitting part 3 is not illuminated, and the color of the colored sheet 1a overlaps with the pattern on the pattern printing layer 6 and is perceived by the observer, it is possible to suppress the observer from perceiving it as a dull color, thereby suppressing a decrease in the degree of harmony with the surroundings given to the observer, and giving the observer a sense of design that blends in with the surrounding environment. The colored sheet 1a is composed of a sheet made of resin mixed with pigment, for example. The pattern printing layer 6 is formed by printing and coating various patterns such as wood grain pores and marble with ink so as to be light-transmitting, and the pattern is formed by light-transmitting ink, a pattern that leaves areas where the ink is not printed (hereinafter referred to as a transparent pattern), or a combination thereof.

[0030] Thus, by providing a pattern printing layer 6 consisting of a light-transmitting ink, a transparent pattern including areas where the ink is not printed or coated, or a combination thereof, on the surface of the shaping sheet 5a facing the light-emitting part 3, when the light-emitting part 3 is illuminated, the light emitted from the light-emitting part 3 passes through the shaping sheet 5a. Within the field of view of an observer viewing the illuminated display surface, the light-emitting part 3, the pattern printing layer 6, the circuit wiring 4, and the colored sheet 1a are all included through the shaping sheet 5a. However, the observer can more easily recognize the light emitted from the light-emitting part 3, and therefore can recognize the illuminated image formed by the light emitted from the light-emitting part 3. In this case, in the case of the display unit 103a according to the third embodiment, since the light emitted from the light-emitting part 3 passes through the shaping sheet 5a through the light-transmitting ink or areas where the ink is not coated, only a portion of the total amount of light emitted from all the light-emitting parts 3 reaches the observer. Comparing the conventional method of providing a transparent pattern on the display surface side of a light-emitting display with the display unit 103a, which has a light-transmitting ink, a transparent pattern including an area where ink is not printed or coated, or a combination thereof (pattern printing layer 6) on the light-emitting surface side of the light-emitting unit 3, the light transmittance of the display unit 103a is higher, so the amount of light that reaches the observer is greater with the display unit 103a compared to when using a conventional light-emitting display.

[0031] Therefore, although some of the emitted light is blocked by the pattern printing layer 6, the amount of light reaching the observer can be improved compared to conventional methods, thereby improving the brightness and image quality of the emitted image. On the other hand, when the light-emitting part 3 is not illuminated, the observer viewing the illuminated display surface will have the light-emitting part 3, the pattern printing layer 6, the circuit wiring 4, and the colored sheet 1a within their field of view through the shaping sheet 5a. However, to the observer, the light-emitting part 3 and the circuit wiring 4 may appear meaningless, or they may not be visible at all depending on the size of the areas where ink is not applied to the pattern printing layer 6. As a result, the colored sheet 1a and the pattern printing layer 6 will be perceived as a design that harmonizes with the surrounding area of ​​the display part 103a.

[0032] Thus, the display unit 103a according to the third embodiment emits less light to the observer compared to the display units 101a and 102a according to the first and second embodiments, where no pattern printing layer is provided on the light-emitting surface side of the light-emitting unit 3. However, compared to the case where a pattern printing layer is provided on the surface of a conventional light-emitting display body, it is possible to improve the brightness and image quality of the emitted image. Furthermore, since it appears to the observer as a design represented by the pattern printing layer 6 and the colored sheet 1a, it is possible to broaden the variations in design. Although the case in which the light-emitting part 3 etc. is covered with the shaping sheet 5a has been described, it is also possible to use the surface protection layer 5 according to the first embodiment instead of the shaping sheet 5a.

[0033] Furthermore, in the display unit 103a, the light-emitting unit 3 and circuit wiring 4 are fixed to the surface of the colored sheet 1a as shown in Figure 6. However, as shown in the display unit 103aa in Figure 7, a transparent sheet 7a may be provided on the surface of the colored sheet 1a, and the light-emitting unit 3 and circuit wiring 4 may be fixed to the surface of the transparent sheet 7a. This makes it easy to change and modify the color of the colored sheet 1a. The transparent sheet 7a is made of, for example, a colorless or colored transparent resin that has light transmittance. Note that Figure 7 is a cross-sectional view of the display unit 103aa when it is cut, corresponding to the same part as in Figure 2. Furthermore, in the display unit 103a according to the third embodiment, the colored sheet 1a may have the following configuration.

[0034] [Variation 1 of colored sheet 1a] As shown in Figures 8 and 9, the colored sheet 1a may be formed from a substrate having an ink layer 1ab on the surface of a substrate 1aa, such as a substrate or a sheet-like member. Figure 8 is a cross-section corresponding to the same portion as in Figure 2, showing a part of the cross-section when the colored sheet 1a is cut from the display section 103a-1, which consists of the substrate 1aa and the ink layer 1ab. Figure 9 is a cross-section corresponding to the same portion as the BB' cross-section of the display section 101a shown in Figure 1, showing a part of the cross-section when the display section 103a-1 is cut. In this case, after forming the circuit wiring 4 on the surface of the substrate 1aa, ink is applied to the entire front surface of the substrate 1aa including the circuit wiring 4 to form an ink layer 1ab. Then, the light-emitting part 3 is fixed onto the substrate 1aa on which the ink layer 1ab has been formed.

[0035] The color of the ink layer 1ab is preferably white or silver, for example, a color that makes it difficult for an observer to see the mounting surface of the display unit 103a-1, the substrate 1aa, and the circuit wiring 4 when looking at the display unit 103a-1. In this way, by providing an ink layer 1ab so as to cover the base material 1aa and the circuit wiring 4, it is possible to suppress the viewer from seeing the installation surface of the display unit 103a-1, the base material 1aa, and the circuit wiring 4, and at the same time, the constraints on the color of the materials that can be used as the installation surface of the display unit 103a-1, the base material 1aa, and the circuit wiring 4 can be reduced, thereby expanding the range of materials that can be used as the installation surface of the display unit 103a-1, the base material 1aa, and the circuit wiring 4.

[0036] [Variation 2 of colored sheet 1a] The colored sheet 1a may be formed from a base material 1aa, such as a substrate or sheet-like member, and a concealing sheet 1ac formed to cover the area excluding the light-emitting part 3, as shown in Figures 10 and 11. Figure 10 is a cross-section corresponding to the same part as in Figure 2, showing a part of the cross-section when the display part 103a-2, which consists of the base material 1aa and the concealing sheet 1ac, is cut. Figure 11 is a cross-section corresponding to the same part as the BB' cross-section of the display part 101a shown in Figure 1, showing a part of the cross-section when the display part 103a-2 is cut.

[0037] As shown in Figures 10 and 11, the concealing sheet 1ac is large enough to cover the entire front surface of the base material 1aa, and has through-holes 1ac' formed at a position opposite the light-emitting part 3, which are approximately the same size as the light-emitting part 3 in a plan view and through which the light-emitting part 3 can pass. With the circuit wiring 4 and the light-emitting part 3 fixed to the surface of the base material 1aa, the concealing sheet 1ac is placed over the base material 1aa, passing each light-emitting part 3 through each through-hole 1ac', so that in a plan view, all parts of the base material 1aa except the light-emitting part 3 are covered by the concealing sheet 1ac. Preferably, at least the side of the concealing sheet 1ac opposite to the base material 1aa is a color such as white or silver, which makes it difficult for an observer to see the mounting surface of the display unit 103a-2, the base material 1aa, and the circuit wiring 4. By providing a concealing sheet 1ac so as to cover the entire front surface of the base material 1aa excluding the light-emitting part 3, it is possible to suppress the viewer from seeing the installation surface of the display unit 103a-2, the base material 1aa, and the circuit wiring 4, and at the same time reduce the color constraints on the materials that can be used for the installation surface of the display unit 103a-2, the base material 1aa, and the circuit wiring 4, thereby expanding the range of materials that can be used for the installation surface of the display unit 103a-2, the base material 1aa, and the circuit wiring 4.

[0038] In this case, as shown in Figure 12, the upper edge of the concealing sheet 1ac may be lower than the upper edge of the light-emitting unit 3 when viewed from the side (Figure 12(a)), or conversely, it may be higher than the upper edge of the light-emitting unit 3 (Figure 12(c)), and furthermore, the thickness may be such that the concealing sheet 1ac and the upper edge of the light-emitting unit 3 are flush (Figure 12(b)). When the upper edge of the concealing sheet 1ac is higher than the upper edge of the light-emitting unit 3, the light emitted by the light-emitting unit 3 is restricted by the concealing sheet 1ac, thereby giving the light directionality. For example, when an observer views the display unit 103a from a position oblique to the position facing the light-emitting surface of the light-emitting unit 3, the illuminated image can be made less visible. Conversely, when the upper edge of the concealing sheet 1ac is lower than the upper edge of the light-emitting unit 3, the light emitted by the light-emitting unit 3 is not restricted by the concealing sheet 1ac, so the illuminated image of the display unit 103a can be seen from a wider range. When the upper edge of the concealing sheet 1ac and the upper edge of the light-emitting unit 3 are flush, the light-emitting unit 3 can be protected by the concealing sheet 1ac from external impacts of any kind.

[0039] [Variation 3 of colored sheet 1a] The colored sheet 1a may be formed from a base material 1aa, such as a substrate or sheet-like member, and a resin layer 1ad formed on the base material 1aa to fill the gaps between the light-emitting parts 3, as shown in Figures 13 and 14. Figure 13 is a cross-section corresponding to the same part as in Figure 2, showing a part of the cross-section when the display part 103a-3, which consists of the base material 1aa and the resin layer 1ad, is cut. Figure 14 is a cross-section corresponding to the same part as the BB' cross-section of the display part 101a shown in Figure 1, showing a part of the cross-section when the display part 103a-3 is cut. In this case, after forming the circuit wiring 4 on the surface of the substrate 1aa, a resin layer 1ad is formed on the entire front surface of the substrate 1aa including the circuit wiring 4, so as to fill the gaps between the light-emitting parts 3. Preferably, the resin layer 1ad is a color such as white or silver, which makes it difficult for an observer to see the mounting surface of the display part 103a-3, the substrate 1aa, or the circuit wiring 4 when looking at the display part 103a-3.

[0040] In this way, by forming a resin layer 1ad so as to cover the base material 1aa and the circuit wiring 4, it is possible to make it difficult for the observer to see the installation surface of the display unit 103a-3, and to reduce the constraints on the color of the materials that can be used as the installation surface of the display unit 103a-3, the base material 1aa, and the circuit wiring 4, thereby expanding the range of materials that can be used as the base material 1aa and the circuit wiring 4. In this case as well, similar to the case of modification 2, the thickness of the resin layer 1ad may be adjusted so that the upper end of the resin layer 1ad and the upper end of the light-emitting part 3 are flush, or the upper end of the light-emitting part 3 is lower or higher than the upper end of the resin layer 1ad, thereby providing directionality or protection.

[0041] [Fourth Embodiment] Next, a display device according to a fourth embodiment of the present invention will be described. As shown in Figure 15, the display device according to this fourth embodiment differs from the display device according to the third embodiment in the configuration of the display unit 103a. The same reference numerals are used for the same parts as the display unit 103a, and their detailed descriptions are omitted. Figure 15 is a cross-sectional view of the same part as in Figure 2, showing a part of the cross-section when the display unit 104a is cut. As shown in Figure 15, the display unit 104a of the display device according to the fourth embodiment is provided with a transparent sheet 7 to protect the light-emitting unit 3 and circuit wiring 4 fixed to the surface of the colored sheet 1a, as in the display unit 103a of the third embodiment. On the side of the transparent sheet 7 opposite to the light-emitting unit 3, a pattern printing layer 6 formed by printing and coating, for example, ink, and a shaping sheet 5a made of a transparent sheet that protects the pattern printing layer 6 are laminated. The transparent sheet 7 is made of, for example, a colorless or colored transparent resin that has light transmittance.

[0042] In this case as well, similar to the display unit 103a according to the third embodiment, the amount of light reaching the observer is less compared to the case where a pattern printing layer is not provided on the light-emitting surface side of the light-emitting unit 3, as in the display units 101a and 102a of the display devices according to the first and second embodiments. However, compared to the case where a pattern printing layer is provided on the surface of a conventional light-emitting display body, it is possible to improve the brightness and image quality of the emitted image. In this case as well, similar to the display unit 103aa in Figure 7, a transparent sheet 7a may be provided on the surface of the colored sheet 1a, as shown in the display unit 104aa in Figure 16, and the light-emitting unit 3 and circuit wiring 4 may be fixed to the surface of the transparent sheet 7a. It is also possible to use the colored sheets shown in Modifications 1 to 3 of the colored sheet 1a as the colored sheet 1a.

[0043] [Fifth Embodiment] Next, a display device according to the fifth embodiment of the present invention will be described. As shown in Figure 17, the display device according to this fifth embodiment differs from the display device according to the fourth embodiment in the configuration of the display unit 104a. The same reference numerals are used for the same part as the display unit 104a, and their detailed explanation is omitted. Figure 17 is a cross-sectional view of the same part as in Figure 2, when the display unit 105a, which will be described later, is cut. As shown in Figure 17, the display unit 105a according to the fifth embodiment is the same as the display unit 104a according to the fourth embodiment, but with a surface protective layer 8 instead of the shaping sheet 5a. In this case as well, the same effects and advantages as the display device according to the fourth embodiment can be obtained. In this case as well, similar to the display unit 103aa in Figure 7, a transparent sheet 7a may be provided on the surface of the colored sheet 1a, as shown in the display unit 105aa in Figure 18, and the light-emitting unit 3 and circuit wiring 4 may be fixed to the surface of the transparent sheet 7a. Figure 18 is a cross-sectional view of the same part as in Figure 2, showing the display unit 105aa described later when cut.

[0044] [Sixth Embodiment] Next, a display device according to the sixth embodiment of the present invention will be described. The display device according to this sixth embodiment defines the proportion of the light-emitting part 3 and the circuit wiring 4 on the light-emitting display surface of the display unit in the display devices according to the first to fifth embodiments. In other words, for example, in the display unit 105a of the display device according to the fifth embodiment, when an observer visually views the light-emitting display surface of the display unit 105a, the observer's field of view includes the pattern printing layer 6, light-emitting part 3, circuit wiring 4, base material 1, and colored sheet 1a, etc., through the surface protection layers 5 and 8 and the shaping sheet 5a, etc. At this time, for example, if the area occupied by the light-emitting part 3 and the circuit wiring 4 on the colored sheet 1a increases, the area occupied by the colored sheet 1a in the viewing screen seen by the observer relatively decreases. As a result, the surface area ratio, which represents the proportion of the colored sheet 1a occupied in the viewing screen, decreases, and the color of the colored sheet 1a may appear to be a different color from its actual color. As a result, when the light-emitting unit 3 is off and not emitting light, the color of the colored sheet 1a may appear different to the observer in areas of the viewing screen where both the colored sheet 1a and the light-emitting unit 3 are present, and in areas where neither is present. Therefore, when the light-emitting unit 3 is off and not emitting light, there is a difference in how the observer perceives the area where both the colored sheet 1a and the light-emitting unit 3 are present and in areas where neither is present. Because areas with different appearances coexist, the observer may perceive the presence of the display unit 105a, and despite the colored sheet 1a and the pattern printing layer 6 being provided to harmonize with the space, the design that harmonizes with the space is compromised.

[0045] Therefore, in the display unit 105a according to the sixth embodiment, the surface area ratio between the light-emitting unit 3 and the circuit wiring 4 is set to 70% or less, preferably 50% or less, more preferably 30% or less, and even more preferably 20% or less. By limiting the surface area ratio of the light-emitting unit 3 and the circuit wiring 4 in this way, the area occupied by the colored sheet 1a on the viewing screen can be secured. As a result, the area occupied by the colored sheet 1a on the viewing screen is reduced, which suppresses the situation in which colored sheets 1a with different display colors are mixed on the viewing screen, making it less likely for the observer to notice the presence of the display unit 101a.

[0046] [Seventh Embodiment] Next, a display device according to a seventh embodiment of the present invention will be described. The display device according to this seventh embodiment defines the size of the light-emitting part 3 and the distance between the observer and the light-emitting display surface of the display unit in the display device according to the first to sixth embodiments. In other words, as explained in the sixth embodiment, for example, when an observer visually inspects the light-emitting display surface of the display unit 105a in the display device according to the fifth embodiment, if the size of the light-emitting part 3 is large, or if the circuit wiring 4 is thick, the observer may perceive the color of the colored sheet 1a as different colors in areas where the light-emitting part 3 and circuit wiring 4 are present and areas where they are not. As a result, the presence of the display unit 105a may be perceived due to the difference in perceived colors, which would detract from the design that harmonizes with the space.

[0047] Therefore, the relationship shown in equation (1) below is set to hold between the size a of the light-emitting unit 3 and the predicted distance A between the light-emitting display surface of the display unit 105a and the observer. The predicted distance A is obtained by measuring the distance between the position where the display unit 105a is planned to be installed and the predicted position of the observer who will observe the display unit 105a. The size a of the light-emitting unit 3 refers to the distance at which the distance between two points on the outer circumference of the chip is maximized when the light-emitting unit 3 is formed of a 3-in-1 chip type LED element. For a circular chip, the size a is the diameter of the chip, and for a rectangular chip, the length of the diagonal is used as the size of the light-emitting unit 3. Furthermore, when the light-emitting unit 3 is formed of three LED elements, the size is the distance at which the distance between two points on the outer circumference of each individual LED element is maximized when viewed from the light-emitting surface side.

[0048] a ≤ A / 500 Preferably a ≤ A / 1000 comfortably a ≤ A / 2000 Furthermore, a ≤ A / 5000 …(1)

[0049] Thus, since the size a of the light-emitting unit 3 is set to be equal to or less than a threshold value (e.g., A / 500) corresponding to the predicted distance A, in the display device according to each of the above embodiments, in an environment where an observer visually observes the light-emitting display surface of the display unit 105a at a relatively close position to the display unit 105a, for example, the size a is restricted to a relatively small value, and it is possible to suppress the display unit 105a from being visually recognized by the observer. Conversely, in an environment where the observer visually observes the display unit 105a from a relatively distant position from the display unit 105a, since the size a is restricted to a relatively large value, in an environment where it is difficult for the observer to visually recognize the display unit 105a, by increasing the size a, the number of the light-emitting units 3 can be reduced, and the selection range of the LED elements as the light-emitting units 3 can be widened.

[0050] In the above seventh embodiment, the size a of the light-emitting unit 3 is set according to the predicted distance A. However, the size a of the light-emitting unit 3 may be further set in consideration of the visual acuity of the observer. That is, a relationship shown in the following formula (2) is established among the size a of the light-emitting unit 3, the predicted distance A, and the visual acuity value n (0 < n) assumed as the visual acuity of the observer. Note that θ in the formula (2) means the gap of the Landolt ring "C" used in a visual acuity test. θ is represented by the following formula (3). a = Asinθ ÷ n ……(2) θ = (2π ÷ 360) × (1 ÷ 60); one-sixtieth of 1° ……(3)

[0051] As shown in FIG. 19, the size a is the value of a when the formula (2) is satisfied and the visual acuity value n representing a visual acuity of 1.0 is 1.0 or less, preferably n is 1.5 or less, more preferably n is 2.0 or less, and even more preferably n is 2.5 or less. That is, even for a person with a visual acuity of 1.0, preferably a person with a visual acuity of 1.5, more preferably a person with a visual acuity of 2.0, it is preferable to make it difficult to recognize the presence of the display unit, and it is preferable to make it difficult to recognize the presence of the display unit regardless of whether the visual acuity is good or bad. In this case as well, in the display device according to the above embodiment, by further setting the size a of the light-emitting unit 3 considering the predicted distance A and the visual acuity value n, it is possible to suppress the observation of the presence of the display unit (e.g., 105a) by visually inspecting the light-emitting display surface of the display unit, while increasing the size a in environments where it is difficult for the observer to see the display unit.

[0052] [Eighth Embodiment] Next, a display device according to the eighth embodiment of the present invention will be described. The display device according to this eighth embodiment defines the wiring used as circuit wiring 4 in the first to seventh embodiments. In other words, for example, in the display unit 105a of the display device according to the fifth embodiment, when an observer visually inspects the light-emitting display surface of the display unit 105a, the observer's field of view includes the pattern printing layer 6, light-emitting unit 3, circuit wiring 4, substrate 1, and colored sheet 1a, etc., through the surface protection layers 5 and 8 and the shaping sheet 5a, etc. However, the light-emitting unit 3 is composed of inorganic LED elements, and inorganic LED elements are driven by current, so the circuit wiring 4 becomes thicker compared to a display device using a liquid crystal display (LCD), for example. Also, if the light-emitting unit 3 is to emit light more brightly, it is necessary to flow more current, so the circuit wiring 4 needs to be made thicker. If the circuit wiring 4 is made thicker in this way, there is a possibility that the observer may be able to see the circuit wiring 4 when the light-emitting unit 3 is turned off and not emitting light. Furthermore, when the light-emitting unit 3 is off, there is a possibility that the observer may perceive the color of the colored sheet 1a differently depending on whether the light-emitting unit 3 and circuit wiring 4 are present or not. Due to this difference in appearance, the observer may be able to see the display unit 105a, thus compromising the design's harmony with the surrounding space.

[0053] Therefore, in the display device according to the eighth embodiment, multiple thin wires are used to form the circuit wiring 4. Each circuit wiring 4 in Figure 1 is an example, and it shows the circuit wiring for the current used to light up each inorganic LED element, connecting the control unit 101b to the anode and cathode sides of the inorganic LED element which serves as the light-emitting unit 3. Each circuit wiring 4 is electrically connected to the anode terminal and cathode terminal of the individual inorganic LED element in the vicinity of the inorganic LED element, and the control unit 101b controls the timing of short-circuiting or opening the circuit composed of each inorganic LED element, thereby causing each inorganic LED element constituting each row to light up or not light up, and thus the display is performed. If this circuit wiring 4 is thick and there are few of them, it will be visible to the observer, and if it is broken, the current will fluctuate, which may prevent the inorganic LED element from lighting up or cause it to become dim. On the other hand, by thinning the wires and using multiple wires, the design is not impaired by making the wiring invisible, and even if some of the multiple wires are broken, the change in the electrical resistance of the circuit wiring is small, and the impact on the display can be reduced.

[0054] Therefore, a single wire for supplying a signal or power to each inorganic LED element included in the light-emitting unit 3, that is, a wire for supplying a signal or power from the control unit 101b to the inorganic LED element, is formed from a plurality of thin wires, and the circuit wiring 4 connected between the control unit 101b and the inorganic LED element is formed from a plurality of thin wires.

[0055] For example, the circuit wiring 4a in Figure 1 consists of multiple circuit wirings 4 connected to inorganic LED elements included in multiple light-emitting units 3 arranged in the same row, as shown in Figure 20(a). Each of these circuit wirings 4 connected to inorganic LED elements is formed from multiple thin wires. For example, it can be formed from multiple parallel wires as shown in Figure 20(b), or from a grid-like wiring where multiple wires are formed in a grid pattern as shown in Figure 20(c), or from a mesh-like wiring where multiple wires are formed in a woven pattern as shown in Figure 20(d). By forming the circuit wiring 4 using multiple thin wires in this way, it is possible to pass the amount of current necessary to drive the light-emitting unit 3, and because the wires are thin, they can be made difficult for observers to see. In addition, although thin wires may be prone to breakage, by connecting each thin wire at various points, even if a break occurs, there is still an electrical connection somewhere, so current can continue to flow.

[0056] [Variation] In the embodiments described above, the case in which the light-emitting part 3 is arranged on the entire front surface of the substrate 1 has been explained, but the invention is not limited to this. For example, the light-emitting part 3 may be arranged in a matrix on only a part of the printed layer 2 to form a light-emitting display surface. In other words, a decorative sheet may be constructed in which a light-emitting display surface is provided on only a part of the decorative sheet such as wallpaper.

[0057] The embodiments described above are merely examples of the present invention, and the present invention is not limited to the embodiments described above. Various modifications can be made to forms other than those described above, as long as they do not depart from the technical spirit of the present invention, depending on the design and other factors. [Explanation of Symbols]

[0058] 1 Base material 1a Colored sheet 1aa base material 1ab ink layer 1ac Concealing Sheet 1ad resin layer 2 printing layers 3. Light-emitting part 4 Circuit wiring 5 Surface protective layer 5a Shaping sheet 6. Pattern printing layer 7 Transparent Sheet 8 Surface protective layer 101 Display device 101a~105a Display section 101b Control Unit

Claims

1. Substrate and A pattern layer formed on the surface of the substrate, Multiple light-emitting units, each consisting of an inorganic LED element fixed to the surface of the pattern layer, A control unit that drives the plurality of light-emitting units, The plurality of light-emitting units and the surface on which the plurality of light-emitting units are fixed are provided with a light-transmitting surface protective layer, A display device characterized by having the following features.

2. A substrate having light transmittance, The pattern layer formed on the back surface of the substrate, Multiple light-emitting units, each consisting of an inorganic LED element formed on the surface of the substrate, A control unit that drives the plurality of light-emitting units, A display device characterized by having the following features.

3. The display device according to claim 2, characterized in that it comprises a plurality of light-emitting units and a light-transmitting surface protective layer provided so as to cover the surface on which the plurality of light-emitting units are fixed.

4. The display device according to claim 3, characterized in that the surface protective layer consists of a light-transmitting shaped sheet on the side of the surface protective layer opposite to the side facing the light-emitting portion, with a concave or convex shape provided on that side.

5. Colored sheet and Multiple light-emitting units, each consisting of an inorganic LED element fixed to the surface of the colored sheet, The plurality of light-emitting units and the surface on which the plurality of light-emitting units are fixed are provided with a light-transmitting surface protective layer, A pattern-applying layer is provided on the surface of the surface protective layer facing the light-emitting portion, which imparts a pattern to the light from the plurality of light-emitting portions and transmits it; A control unit that drives the light-emitting unit, Equipped with, The display device is characterized in that the surface protective layer consists of a light-transmitting shaped sheet with a concave or convex shape on the side opposite to the side facing the light-emitting portion.

6. The display device according to claim 5, characterized in that a light-transmitting transparent sheet is provided between the surface of the shaping sheet on which the pattern-applying layer is provided and the light-emitting portion.

7. The display device according to claim 5 or 6, characterized in that the colored sheet comprises a base material and an ink layer applied on the base material to reduce the visibility of the mounting surface of the display device and the base material.

8. The light-emitting part is provided on the surface of the substrate, The substrate surface is provided with circuit wiring that electrically connects the light-emitting unit and the control unit. The display device according to claim 7, wherein the ink layer has a color that reduces the visibility of the mounting surface of the display device, the substrate, and the circuit wiring, and is formed on the substrate and the circuit wiring.

9. The aforementioned colored sheet comprises a base material and an opaque sheet placed on the base material. The light-emitting part is provided on the surface of the substrate, The substrate surface is provided with circuit wiring that electrically connects the light-emitting unit and the control unit. The display device according to claim 5 or 6, wherein the concealing sheet is a sheet that reduces the visibility of the mounting surface of the display device, the substrate, and the circuit wiring, and has a through hole through which the light-emitting part passes at a position facing the light-emitting part, and is arranged on the circuit wiring so that the light-emitting part and the through hole face each other.

10. The colored sheet comprises a base material and an opaque sheet placed on the base material to reduce the visibility of the mounting surface of the display device and the base material. The light-emitting part is provided on the surface of the substrate, The substrate surface is provided with circuit wiring that electrically connects the light-emitting unit and the control unit. The display device according to claim 5 or 6, characterized in that the concealing sheet is a resin layer formed to cover the substrate, the circuit wiring, and the side surface of the light-emitting part.

11. The display device according to claim 10, characterized in that the concealing sheet and the light-emitting part are flush with each other.

12. The display device according to claim 10, characterized in that, in a front view, the upper end of the concealing sheet is lower than the upper end of the light-emitting portion.

13. The display device according to claim 10, characterized in that, when viewed from the front, the upper end of the concealing sheet is higher than the upper end of the light-emitting portion.

14. The light-emitting part is provided on a fixed surface, and the circuit wiring is provided to electrically connect the light-emitting part and the control unit. The display device according to claim 1 or 3, characterized in that the surface area ratio, which is the ratio of the area occupied by the light-emitting part and the circuit wiring on the surface to which the light-emitting part is fixed, is 70% or less.

15. The light-emitting part is provided on a fixed surface, and the circuit wiring is provided to electrically connect the light-emitting part and the control unit. The display device according to claim 1 or 3, characterized in that one wire that supplies a signal or power to each inorganic LED element included in the light-emitting section is formed from a plurality of thin wires.

16. The display device according to claim 1 or 3, characterized in that the light-emitting parts are arranged in a matrix.

17. The display device according to claim 1 or 3, characterized in that the predicted distance A between the light-emitting unit and an observer viewing the light emitted from the light-emitting unit, and the size a of the light-emitting unit as seen from the light-emitting surface side, satisfy the following formula (1). a ≤ A / 500 ……(1)

18. The display device according to claim 1 or 3, characterized in that the estimated visual acuity value n of an observer viewing the light emitted from the light-emitting unit, using a Landolt ring, satisfies the following equation (2) and 0 < n ≤ 1.

0. a=Asinθ÷n...(2) θ=(2π÷360)×(1÷60) A: The predicted distance between the light-emitting unit and the observer who is viewing the light emitted from the unit. a: Size of the light-emitting part as seen from the light-emitting surface side.

19. A decorative sheet equipped with the display device described in claim 1 or claim 3, The decorative sheet is characterized in that the display device is provided on a part of the surface of the decorative sheet.

20. A decorative sheet equipped with the display device described in claim 5, The decorative sheet is characterized in that the display device is provided on a part of the surface of the decorative sheet.

21. A method for manufacturing a display device according to claim 8, The circuit wiring is formed on the surface of the substrate. An ink layer is formed on the surface of the substrate including the circuit wiring to reduce the visibility of the mounting surface of the display device, the substrate, and the circuit wiring. A method for manufacturing a display device, characterized by forming the ink layer and then installing the light-emitting part on the surface of the substrate.

Images