JP6904551B2 - LED display device - Google Patents

Description

The present invention relates to an LED display device.

A large number of various display devices such as LED (Light Emitting Diode) display devices are installed on the street. These display devices display various images related to advertisements, such as still images and moving images, and provide information to passers-by.

For example, Patent Document 1 states that when observing a large-sized LED display at a short distance, the light of each LED element is not perceived as a point to create a natural image, and further, a moire phenomenon occurs in re-shooting of the large-sized display. An LED display device capable of preventing the above is disclosed. Specifically, in an LED display device in which a plurality of LED elements corresponding to a plurality of pixels are arranged in a predetermined pattern to display a predetermined image, a function of diffusing light while maintaining a constant distance from each LED element is provided. A plate-shaped or film-shaped optical member to have is arranged, and an optical member having light transmittance in contact with both the LED element and the optical member is arranged between the LED element and the optical member.

Further, Patent Document 2 discloses a thin and light panel type display module. Specifically, it is a panel type display module, and is a row of first to third color LED lamps in which a large number of LED lamps are mounted on the surface of a rectangular printed wiring board in a straight line with a pitch a in the vertical direction. A total of three rows are arranged in parallel at a pitch b equal to or less than the pitch a to form a three-primary-color LED lamp row set, and a plurality of three-primary-color LED lamp row sets are arranged in parallel at predetermined intervals, and are adjacent to each other. A non-lamp band-shaped area with a width d of at least twice the pitch b between the matching three primary color LED lamp row sets is provided, and one or more integrated circuits are mounted in each of the non-lamp strip-shaped areas, and the right end and left end LED lamp rows are provided. The total dimension of the distance p and q between the right end and the left end of the wiring board is made smaller than the width d of the non-lamp band area, and the line connecting the connector or LED lamp mounted on the end of the wiring board and the integrated circuit is a pattern. It is formed.

Japanese Unexamined Patent Publication No. 2014-202816 Japanese Unexamined Patent Publication No. 2012-27484

In the LED display device of Patent Document 1, the configuration of the entire device is large. Therefore, a great deal of labor is required for the installation work of the LED display device. On the other hand, since the panel type display module of Patent Document 2 is thin and light, the labor required for the installation work is reduced. Therefore, it is conceivable to install such a panel type display module in various places such as a building wall or a window glass. When the LED display device is installed on the window glass, a passerby walking outside can view various images displayed on the LED display device. On the other hand, a person in the office cannot see the scenery outside the window because the view is obstructed by the LED display device.

In order to avoid such a situation, for example, a substrate made of a transparent material is used for the LED display device. However, since various members related to the display of various images are arranged on the substrate in addition to the LED chip, it cannot be said that the transparency of the display is sufficiently ensured.

Therefore, an object of the present invention is to provide an LED display device having improved transparency.

A brief description of typical inventions disclosed in the present application is as follows.

The LED display device according to a typical embodiment of the present invention includes a transparent LED substrate, a plurality of LED elements provided on the first main surface of the LED substrate, and a side opposite to the first main surface of the LED substrate. The data line is provided on the second main surface of the LED element and is connected to the LED element through a through hole penetrating the first main surface and the second main surface. It intersects with a plurality of LED elements and extends.

Among the inventions disclosed in the present application, the effects obtained by representative ones will be briefly described as follows.

That is, according to a typical embodiment of the present invention, it is possible to provide an LED display device having improved transparency of a substrate.

It is a top view which shows an example of the structure of the LED display apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which shows an example of the structure of the LED display apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the other example of the structure of the LED display apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which shows an example of the structure of the LED display apparatus which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the other example of the structure of the LED display apparatus which concerns on Embodiment 2 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in all the figures for demonstrating the embodiment, in principle, the same reference numerals are given to the same parts, and the repeated description thereof will be omitted.

(Embodiment 1)
<Configuration of LED display device>
FIG. 1 is a plan view showing an example of the configuration of the LED display device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing an example of the configuration of the LED display device according to the first embodiment of the present invention. FIG. 1 shows a part of the display unit 20 of the LED display device 100. Further, in FIG. 1, the data line 40 provided on a surface different from the surface on which the LED element 30 is arranged is indicated by a dotted line. In FIG. 2, a part of the LED elements 30 and the cross-sectional shape around them are schematically shown.

As shown in FIGS. 1 and 2, the LED display device 100 includes an LED substrate 10, a display unit 20, a data line 40, a power supply line 50, an LED protective layer 60, an adhesive layer 70, a protective layer 80, and the like. ..

The LED substrate 10 is, for example, a flat transparent substrate. The shape of the LED substrate 10 in a plan view is, for example, a rectangle, a circle, an ellipse, or the like, but is not limited to these shapes. For example, the shape of the LED substrate 10 may be any shape in consideration of the installation location of the LED display device 100 and the like.

The LED substrate 10 is made of a material having high heat resistance. In the present specification, "having high heat resistance" means that the LED substrate 10 does not deteriorate even when the temperature of the LED substrate 10 reaches, for example, 160 ° C., and the LED display device 100 is operating normally. say. Further, it is preferable that the LED substrate 10 has flexibility. As a result, the LED substrate 10 can be deformed into an arbitrary shape according to the installation location of the LED display device 100.

The LED substrate 10 is made of, for example, PCB (Polychlorinated Biphenyl), PET (PolyEthylene Polyethylene terephthalate), PEN (PolyEthylene Polyethylene terephthalate), PI (polyethylene terephthalate), PI (polychlorinated biphenyl), PET (polyethylene terephthalate), PI (polyethylene terephthalate), PI (polychlorinated biphenyl), PET (polyethylene terephthalate), PI (polyethylene terephthalate), PI (polychlorinated biphenyl), PET (polyethylene terephthalate), It is composed of a resin such as polyethylene).

A display unit 20, a power supply line 50, and the like are provided on the first main surface 10a of the LED substrate 10. As shown in FIG. 1, a plurality of pixels 25 are arranged in a matrix on the display unit 20 along each of the X-axis direction (first direction) and the Y-axis direction (second direction).

Each pixel 25 is composed of a plurality of LED elements 30 that emit different colors. Specifically, as shown in FIG. 1, the pixel 25 includes an LED element 30R that emits red, an LED element 30G that emits green, an LED element 30B that emits blue, and an LED element 30X. Here, the LED element 30X may be an LED element that emits a color different from these colors, or may be an LED element that emits the same color as any of these colors.

In one pixel 25, as shown in FIG. 1, LED elements 30R and 30G are arranged adjacent to each other along the X-axis direction, and LED elements 30X and 30B are arranged adjacent to each other along the X-axis direction. Has been done. Further, the LED elements 30R and 30X are arranged adjacent to each other along the Y-axis direction, and the LED elements 30G and 30B are arranged adjacent to each other along the Y-axis direction. Although FIG. 1 shows an example of the color arrangement of the LED element 30, the color arrangement of the LED element 30 in the pixel 25 is not limited to this. Further, the color arrangement of the LED element 30 may be changed for each pixel 25.

As shown in FIG. 2, the LED element 30 is connected to the lead wire 45 and the power supply line 50 via a wire 46, respectively. For example, gold is used as the material of the wire 46.

As shown in FIG. 2, the power supply line 50 is formed on the first main surface 10a of the LED substrate 10. As shown in FIG. 1, the power supply line 50 is commonly provided for the plurality of LED elements 30. The power supply line 50 extends along the X-axis direction of FIG. 1, for example, and is commonly provided for one line of pixels 25 arranged in the X-axis direction. Specifically, the power supply line 50 is provided for each of the row in which the LED elements 30R and 30G shown in FIG. 1 are arranged and the row in which the LED elements 30X and 30B are arranged. As described above, the power supply line 50 is provided with two power supply lines 50 in parallel with respect to one pixel 25.

As shown in FIG. 2, for example, the LED substrate 10 is formed with a through hole 15 penetrating the first main surface 10a and the second main surface 10b. The through hole 15 is provided for each LED element 30. For example, the through hole 15 is formed so that an opening is provided in the wiring region of the lead wire 45 connected to the corresponding LED element 30.

FIG. 3 is a cross-sectional view showing another example of the configuration of the LED display device according to the first embodiment of the present invention. Chamfered portions 15a and 15b may be formed at the end of the through hole 15, for example, as shown in FIG. A chamfered portion 15a is formed at the end of the through hole 15 on the first main surface 10a side. A chamfered portion 15b is formed at the end of the through hole 15 on the second main surface 10b side. The chamfered portions 15a and 15b are formed so that the through hole 15 and the first main surface 10a and the second main surface 10b are gently connected.

A plurality of data lines 40 are provided on the second main surface 10b opposite to the first main surface 10a of the LED substrate 10. The data line 40 is provided for each LED element 30, for example. As shown in FIG. 1, the data line 40 intersects and extends the plurality of LED elements 30 in a plan view. As shown in FIG. 1, for example, the data line 40 intersects with the LED element 30 in a plan view and extends in the Y-axis direction. Specifically, the data lines 40 (40R, 40X) extend along the row in which the LED elements 30R and 30X shown in FIG. 1 are arranged. Further, the data line 40 connected to the other LED elements 30 arranged in this row also extends so as to intersect with the LED elements 30R and 30X in a plan view.

Further, the data lines 40 (40G, 40B) extend along the row in which the LED elements 30G, 30B shown in FIG. 1 are arranged. Further, the data line 40 connected to the other LED elements 30 arranged in this row also extends so as to intersect with the LED elements 30G and 30B in a plan view. As described above, in each LED element 30, at most, the same number of data lines 40 as the number of LED elements 30 arranged in the same row intersect and extend in a plan view.

The data line 40 is connected to the LED element 30 via the through hole 15. Specifically, the data line 40 is connected to the LED element 30 via a through hole 15, a lead wire 45, and a wire 46.

The metal layer (not shown) of the data line 40, the power supply line 50, the lead wire 45, and the through hole 15 is composed of, for example, copper as a main component. Here, "copper as a main component" means that these wirings and the like are mostly composed of copper, but impurities may be mixed therein.

The data line 40 (40R, 40G, 40B, 40X) and the power supply line 50 are connected to a control unit (controller) (not shown). A predetermined signal (for example, electric potential) is output from the control unit to the data line 40 (40R, 40G, 40B, 40X) and the power supply line 50. Each LED element 30 is switched on and off based on a signal (for example, an electric potential) supplied from a data line 40 (40R, 40G, 40B, 40X) and a power supply line 50. By switching the on / off state of each LED element 30, a still image or a moving image is displayed on the display unit 20.

The transparency of the LED display device 100 is the ratio obtained by subtracting the area of the LED element 30, the data line 40, the power supply line 50, etc. provided on the LED substrate 10 from the area of the LED substrate 10 in the plan view. Say that.

The outline of the process of forming the through hole 15, the data line 40, the lead wire 45, and the power supply line 50 will be described below. First, the through hole 15 is formed by irradiating the LED substrate 10 with a laser, for example. The through hole 15 is formed at a predetermined position determined in consideration of the position where the LED element 30 is arranged and the position where the lead wire 45 is formed. A step of forming chamfered portions 15a and 15b may be provided in the through hole 15 as needed.

Next, for example, by a plating step, a metal layer containing, for example, copper as a main component is formed on the side wall of the through hole 15. In the plating step, a metal layer may be formed so as to fill not only the side wall but also the entire through hole 15.

Next, the lead wire 45 and the power supply line 50 are formed on the first main surface 10a. For example, a metal layer containing, for example, copper as a main component is formed on the first main surface 10a by a film forming step such as sputtering. After that, the lead wire 45 and the power supply line 50 are formed by patterning the metal layer based on the wiring pattern defined in advance.

Next, the data line 40 is formed on the second main surface 10b. Since the data line 40 is formed in the same process as that performed on the first main surface 10a, for example, detailed description thereof will be omitted. After performing the step of forming the data line 40 on the second main surface 10b, the step of forming the lead wire 45 and the power supply line 50 on the first main surface 10a may be performed.

An LED protective layer 60 that covers the LED element 30 is provided on the first main surface 10a side of the LED substrate 10. For example, as shown in FIG. 2, the LED protective layer 60 is provided so as to cover the LED element 30 and the wire 46. The LED protective layer 60 is made of a material having transparency, insulation, and ductility (for example, silicon epoxy resin or the like).

The LED protective layer 60 may be provided for each pixel 25 or for each LED element 30, for example. Alternatively, the LED protective film 60 may be provided over a plurality of pixels 25.

An adhesive layer 70 is provided on the first main surface 10a side of the LED substrate 10. The adhesive layer 70 is provided in the space between the adjacent LED protective layers 60, for example, as shown in FIG. The LED protective layer 60 and the adhesive layer 70 are configured to be at the same height from the first main surface 10a of the LED substrate 10. The adhesive layer 70 is also preferably made of a transparent and ductile material.

As shown in FIG. 2, a protective layer 80 is provided on the second main surface 10b side of the LED substrate 10. The protective layer 80 is provided to protect the data line 40 and the LED substrate 10. The protective layer 80 is preferably made of, for example, a transparent and ductile material.

<Effect of this embodiment>
According to the present embodiment, the data line 40 is provided on the second main surface 10b, which is different from the LED element 30 arranged on the first main surface 10a, and extends so as to intersect the LED element 30 in a plan view. Exists.

According to this configuration, the combined area of the data line 40 and the LED element 30 in a plan view is reduced, so that the LED display device 100 with improved transparency is provided. As a result, when the LED display device 100 is installed on a window glass, for example, the visibility of the scenery outside the window is improved. Therefore, this makes it possible to improve the visibility of the scenery while displaying the image by the LED display device 100.

Further, according to the present embodiment, the display unit 20 is configured by arranging a plurality of pixels 25 composed of a plurality of LED elements 30 in a matrix, and the data lines 40 are arranged in the column direction of the display unit 20 (second). It extends along the direction).

According to this configuration, since the data line 40 can intersect with the adjacent pixel 25 at the shortest distance, the length of the data line 40 is suppressed and the wiring load is reduced. Further, as a result, the power consumption of the LED display device 100 can be suppressed.

Further, according to this configuration, the display unit 20 arranges the pixels 25 at regular intervals, so that the quality of the displayed image can be improved.

Further, according to the present embodiment, the data line 40, the lead wire 45, and the power supply line 50 are composed mainly of copper. According to this configuration, inexpensive materials are used for these wirings, so that the manufacturing cost is reduced.

Further, according to the present embodiment, the LED substrate 10 is made of a material having high heat resistance. According to this configuration, the LED substrate 10 does not deteriorate even when the LED element 30 is in a high temperature state, so that the LED display device 100 with improved operating performance is provided.

Further, according to the present embodiment, the LED substrate 10 is made of a flexible material.

According to this configuration, since it is arbitrarily deformed according to the installation location, an LED display device with an improved degree of freedom in the installation location is provided.

Further, according to the present embodiment, the LED substrate 10 is composed of a PCB. According to this configuration, since an inexpensive material is used, the manufacturing cost is reduced.

Further, according to the present embodiment, chamfered portions 15a and 15b are formed at the end portions of the through holes 15.

According to this configuration, since the end portion of the through hole 15 has a gentle shape, disconnection between the through hole 15 and the lead wire 45 and disconnection between the through hole 15 and the data wire 40 can be suppressed. Further, as a result, the LED display device 100 having an improved reliability line is provided.

Further, according to the present embodiment, the pixel 25 is composed of a plurality of LED elements 30 that emit different colors.

According to this configuration, it is possible to display various colors on each pixel 25, so that the LED display device 100 with improved display quality is provided.

Further, according to the present embodiment, the LED protective layer 60 that covers the LED element 30 and the wire 46 is provided on the first main surface 10a side of the LED substrate 10.

According to this configuration, the impact on the LED element 30 and the wire 46 is alleviated, so that the LED display device 100 with improved reliability is provided.

Further, according to the present embodiment, the adhesive layer 70 is provided in the space between the adjacent LED protective layers 60.

According to this configuration, since the LED display device 100 is fixed at an arbitrary place, the LED display device 100 with an improved degree of freedom in the installation place is provided.

Further, according to the present embodiment, the LED protective layer 60 and the adhesive layer 70 are provided so as to be at the same height from the first main surface 10a of the LED substrate 10.

According to this configuration, since the LED display device 100 can be brought into close contact with the installation location, the LED display device 100 that is stably fixed to the installation location is provided.

(Embodiment 2)
Next, the second embodiment will be described. In the second embodiment, a case where a plurality of substrates are laminated will be described. In the following description, the description of the content overlapping with the first embodiment will be omitted in principle.

FIG. 4 is a cross-sectional view showing an example of the configuration of the LED display device according to the second embodiment of the present invention. The LED display device 200 according to the present embodiment is configured by laminating a wiring board 110 on the LED display device 100 of the first embodiment. Specifically, the LED display device 200 is configured by laminating a transparent wiring board 110 on the second main surface 10b side of the LED board 10.

Since the wiring board 110 has the same properties as the LED board 10 described in the above-described embodiment, detailed description of the material and the like will be omitted. A data line 140 is provided on the first main surface 110a of the wiring board 110. The data line 140 is connected to the LED element 30 via the through hole 15 of the LED substrate 10.

Specifically, as shown in FIG. 4, a lead wire 145 connected to the through hole 15 is provided on the second main surface 10b of the LED substrate 10. Further, on the second main surface 10b of the LED substrate 10, a protective layer 80 is provided so that the lead wire 145 is exposed. On the other hand, as shown in FIG. 4, the LED substrate 10 and the wiring board 110 are laminated so that the data line 140 and the lead wire 145 are in contact with each other. In this way, the data line 140 is connected to the lead wire 145. In this way, the data line 140 is connected to the LED element 30. The protective layer 80 in the present embodiment is electrically used between the wiring provided on the second main surface 10b of the LED substrate 10 and the wiring provided on the first main surface 110a of the wiring board 110. Functions as an insulating layer to prevent short circuits.

In the display unit 20, the data line 140 provided on the first main surface 110a of the wiring board 110 extends so as to intersect with the LED element 30 in a plan view as shown in FIG. Since the arrangement of the data lines 140 is the same as that of the data lines 40 in the first embodiment, detailed description thereof will be omitted here.

FIG. 5 is a cross-sectional view showing another example of the configuration of the LED display device according to the second embodiment of the present invention. The second main surface 110b opposite to the first main surface 110a of the wiring board 110 has a through hole 115 penetrating the first main surface 110a and the second main surface 110b of the wiring board 110, and an LED. A data line 150 connected to the LED element 30 via a through hole 15 of the substrate 10 is provided.

Since the through hole 115 is the same as the through hole 15 of the first embodiment, detailed description thereof will be omitted here.

As shown in FIG. 4, a lead wire 145 connected to the through hole 15 is provided on the second main surface 10b of the LED substrate 10. A lead wire 155 connected to the through hole 115 is provided on the first main surface 110a of the wiring board 110. On the other hand, as shown in FIG. 4, the LED substrate 10 and the wiring board 110 are laminated so that the lead wires 155 and the lead wires 145 are in contact with each other. As a result, the lead wire 155 is connected to the lead wire 145. In this way, the data line 150 is connected to the LED element 30.

In the display unit 20, the data line 150 provided on the second main surface 110b of the wiring board 110 extends so as to intersect with the LED element 30 in a plan view as shown in FIG. Since the arrangement of the data lines 150 is the same as the data lines 40 in the first embodiment and the data lines 140 in the present embodiment, detailed description thereof will be omitted here.

The lead wire 145 and the data wire 40 may be mixed on the second main surface 10b of the LED substrate 10. Further, the lead wire 155 and the data line 140 may be mixed on the first main surface 110a of the wiring board 110. A protective layer 180 is provided on the second main surface 110b side of the wiring board 110. Since the material and the like of the protective layer 180 are the same as those of the protective layer 80 described above, detailed description thereof will be omitted here.

<Effect of this embodiment>
According to the present embodiment, in addition to the effects described in the first embodiment, the following effects are exhibited.

According to the present embodiment, the data line 140 connected to the LED element 30 is provided on the first main surface 110a of the transparent wiring board 110 laminated on the second main surface 10b side of the LED substrate 10. In the display unit 20, the data line 140 of the wiring board 110 intersects with the LED element 30 in a plan view and extends.

According to this configuration, the data line 140 can be provided on the wiring board 110 in addition to the LED board 10, so that more data lines can be provided with the LED element 30 together with the data line 40 provided on the LED board 10. Can be arranged crossing. As a result, even if more pixels 25 or LED elements 30 are provided, the LED display device 200 with improved transparency is provided.

Further, according to the present embodiment, the data line 150 connected to the LED element 30 is also provided on the second main surface 110b of the wiring board 110, and the data line 150 of the wiring board 110 is displayed on the display unit 20. It intersects with the LED element 30 in a plan view and extends.

According to this configuration, in addition to the first main surface 110a of the LED board 10 and the wiring board 110, the data line 150 can be provided on the second main surface 110b of the wiring board 110, so that the data line 150 can be provided on the LED board 10. In addition to the data line 40 and the data line 140 provided on the first main surface 110a of the wiring board 110, more data lines can be arranged so as to intersect the LED element 30. As a result, even if more pixels 25 or LED elements 30 are provided, the LED display device 200 with improved transparency is provided.

(Other embodiments)
The LED display device of the present invention may have other embodiments. For example, the LED display device may be configured by sequentially laminating a plurality of wiring boards 110 on the second main surface side 10b of the LED board 10.

According to this configuration, in addition to the first main surface 110a and the second main surface 110b of the LED board 10 and the wiring board 110, data lines can be provided on the wiring board further provided, so that the LED board 10 can be provided. 40, the data line 140 provided on the first main surface 110a of the wiring board 110, and the data line 150 provided on the first main surface 110a of the wiring board 110 are combined with even more data lines. Can be arranged so as to intersect the LED element 30. As a result, even if more pixels 25 or LED elements 30 are provided, the LED display device 200 with improved transparency is provided.

Although the invention made by the present inventor has been specifically described above based on the embodiments, the present invention is not limited to the embodiments described so far, and various modifications can be made without departing from the gist thereof. Needless to say.

10 ... LED substrate, 10a ... 1st main surface, 10b ... 2nd main surface, 15 ... through hole, 20 ... display unit, 25 ... pixel, 30, 30R, 30G, 30B, 30X ... LED element, 40, 40R, 40G, 40B, 40X ... Data line, 50 ... Power line, 60 ... LED protective layer, 70 ... Adhesive layer, 80 ... Protective layer, 100 ... LED display device, 110 ... Wiring board, 110a ... First main surface , 110b ... Second main surface, 115 ... Through hole, 140, 150 ... Data line

Claims (13)

With a transparent LED board
A display unit composed of a plurality of LED elements provided on the first main surface of the LED substrate, and a display unit.
The LED element is connected to the LED element through a through hole provided on a second main surface of the LED substrate opposite to the first main surface and penetrating the first main surface and the second main surface. With data lines,
In the display unit, the data line extends so as to intersect with the LED element in a plan view.
A transparent wiring board is laminated on the second main surface side of the LED board.
A data line connected to the LED element via the through hole of the LED substrate is provided on the first main surface of the wiring board facing the second main surface of the LED substrate.
In the display unit, the data line of the wiring board intersects with the LED element in a plan view and extends.
LED display device. In the LED display device according to claim 1,
On the second main surface of the wiring board opposite to the first main surface, a through hole penetrating the first main surface and the second main surface of the wiring board, and the LED substrate. A data line connected to the LED element via the through hole of the above is provided.
The data line on the second main surface of the wiring board intersects with the LED element in a plan view and extends.
LED display device. In the LED display device according to claim 1,
A plurality of the wiring boards are sequentially laminated on the second main surface side of the LED substrate.
LED display device. In the LED display device according to any one of claims 1 to 3.
The display unit is configured by arranging a plurality of pixels composed of the plurality of LED elements in a matrix along the first direction and the second direction.
The data lines extend along the second direction, respectively.
LED display device. In the LED display device according to any one of claims 1 to 3.
The data line is composed mainly of copper.
LED display device. In the LED display device according to any one of claims 1 to 3.
The LED substrate is made of a material having high heat resistance.
LED display device. In the LED display device according to any one of claims 1 to 3.
The LED substrate is made of a flexible material.
LED display device. In the LED display device according to any one of claims 1 to 3.
The LED substrate is composed of PCB.
LED display device. In the LED display device according to any one of claims 1 to 3.
A chamfered portion is formed at the end of the through hole.
LED display device. In the LED display device according to claim 4,
The pixel is composed of a plurality of the LED elements that emit different colors.
LED display device. In the LED display device according to any one of claims 1 to 3.
An LED protective layer covering the LED element is provided on the first main surface side of the LED substrate.
LED display device. In the LED display device according to claim 11,
An adhesive layer is provided in the space between the adjacent LED protective layers.
LED display device. In the LED display device according to claim 12,
The LED protective layer and the adhesive layer are provided so as to be at the same height from the first main surface of the LED substrate.
LED display device.

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