JP3869120B2 - LED display device and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an LED (Light Emitting Diode) display device and a manufacturing method thereof.
[0002]
[Prior art]
FIG. 14 is an exploded perspective view showing a simplified LED display device 1 of the prior art. The LED display device 1 is configured by arranging a plurality of modules 2 in which chip-type LED elements are arranged in a matrix, in a matrix. The chip-type LED element has a reflective surface behind the light emitting element in order to increase the luminance. However, the reflective surface not only reflects light from the light emitting element but also reflects external light from outside the LED display device 1, so that the contrast between when the LED element is turned on and when the LED element is turned off decreases. . In order to solve this problem, the LED display device 1 is provided with a semi-transparent filter 3 made of a synthetic resin such as acrylic on the surface side of the LED display element to make it difficult for external light to enter.
[0003]
FIG. 16 is a cross-sectional view showing another prior art LED display device 5, which is disclosed in Japanese Patent Laid-Open No. 6-186917. The LED display device 5 includes a cylinder 7 having a reflective inner surface facing the surface of the chip-shaped LED element 6 in order to improve the visibility, and a sheet 8 that transmits visible light is connected to the LED element 6 of the cylinder 7. In the opening on the opposite side. In this way, the light from the LED element 6 is diffusely reflected on the inner surface of the tube 7, and the entire inner surface of the tube 7 becomes a light source, illuminates the sheet on the upper surface of the tube, and the illuminated portion of the sheet emits light. The visibility from an oblique direction is good.
[0004]
FIG. 17 is a side view showing still another conventional LED display device 10, which is disclosed in Japanese Patent Laid-Open No. 4-7590. In the LED display device 10, a filter 13 having a ridge-shaped protrusion 12 is provided in front of a plurality of lamp-shaped LED elements 11 arranged in a matrix. The filter 13 includes a polycarbonate molded plate 14 having protrusions 12, a flat polycarbonate molded plate 15, and an electromagnetic shielding cloth 16 interposed between the molded plates 14 and 15. The filter 13 is configured to be able to block external light from the direction intersecting the protrusion 12 by the protrusion 12.
[0005]
[Problems to be solved by the invention]
In the LED display device 1 shown in FIG. 14, the filter 3 not only makes it difficult for external light to enter, but also blocks light from the LED element, so that there is a problem that the luminance is lowered. Similarly to the device 1 shown in FIG. 14 described above, the display device 5 disclosed in the special opening / closing 6-186717 shown in FIG. 15 also has the same problem when the LED element has a reflecting surface to improve the luminance. Occurs.
[0006]
Further, in the device 10 disclosed in the special opening / closing 4-7590 shown in FIG. 16, the filter 13 is inserted through the through hole 17 formed in the molding plate 14 of the filter 13 as shown in FIG. It must be attached by screwing a screw member 19 into a screw hole 18 formed in a substrate on which the display element 11 is mounted. The molded plate 15 must also be attached in a similar configuration. Thus, the filter 13 requires a space for arranging screws between the LED elements in order to be attached to the substrate 18, and cannot be densely arranged with a small interval between the LED elements 11, It cannot be applied to an LED display device that displays a detailed display. In FIG. 17, in order to facilitate understanding, a part of the LED element 11 and the protrusion 12 is omitted.
[0007]
Accordingly, an object of the present invention is to provide an LED display device that has a high contrast between lighting and extinguishing, and does not require a region for attaching means for increasing the contrast around the LED element.
[0008]
[Means for Solving the Problems]
  The present inventionA plurality of LED elements;Louver film having a light shielding layer having a louver that blocks light in a direction intersecting the thickness directionAnd
  A louver film is attached to each LED element individually.It is the LED display device characterized by this.
[0009]
According to the present invention, a louver film is attached to the surface of the LED element, and this louver film has a light shielding layer including a louver that blocks light in a direction intersecting the thickness direction. Thereby, it can prevent that the external light from the direction which cross | intersects the thickness direction of a louver film is irradiated to a LED element. Therefore, it can be prevented that the LED element is irradiated with external light, and the light is reflected by the LED element, and the LED element is close to the lighting state, and the contrast between when the LED element is turned on and when the LED element is turned off can be reduced. Can be high.
[0010]
  Furthermore, since the louver film is attached to the surface of the LED element, there is no need to use a screw member or the like for attaching the louver film, and a screw member or the like for attaching the louver film around the LED element is arranged. Does not require space. In particular, in an LED display device having a plurality of LED elements, it is possible to arrange the LED elements adjacent to each other as much as possible by reducing the interval between the LED elements.AhHigh-detail display is possible.And since a louver film is not stuck between each LED element, the quantity of a required louver film can be decreased. Thus, a liquid crystal display device capable of high-detail display and high contrast can be realized using a small amount of louver film.
[0013]
Furthermore, the invention is characterized in that the louver of the louver film is formed in parallel with the thickness direction.
[0014]
According to the present invention, since the louver is formed in parallel with the thickness direction, the light perpendicular to the surface of the LED element is not blocked, and the display content can be easily confirmed from the direction perpendicular to the surface of the LED element. be able to.
[0015]
Furthermore, the present invention is characterized in that the louver of the louver film is formed at a predetermined angle with respect to the thickness direction.
[0016]
According to the present invention, since the louver is formed at a predetermined angle with respect to the thickness direction, light in a direction at a predetermined angle with respect to the thickness direction is not blocked, and from this direction, display is not performed. The contents can be easily confirmed.
[0017]
Furthermore, the present invention is characterized in that the louver film has a protective layer made of a synthetic resin having translucency on at least the light shielding layer opposite to the LED element.
[0018]
According to this invention, the said louver film has the protective layer which consists of a synthetic resin which has translucency at least on the opposite side to the LED element of a light shielding layer. Thereby, the light shielding layer can be protected by this protective layer, the effect of shielding the outside light by the light shielding layer can be maintained for a long period of time, and the maintainability is excellent.
[0019]
Furthermore, the present invention provides an LED element after a louver film having a light shielding layer having a louver that blocks light in a direction intersecting the thickness direction is attached to the surface of a panel on which a plurality of LED elements are arranged in a matrix. An LED display device manufacturing method characterized by dividing an LED element.
[0020]
According to the present invention, the LED element and the LED element are divided after the louver film is attached to the surface of the panel on which the plurality of LED elements are arranged. Compared with the case where a louver film is attached to an LED element, the LED element to which the louver film is attached can be easily manufactured.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view showing a module 30 constituting an LED display device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the module 30, and FIG. 3 is a front view showing the module 30. The LED display device includes a plurality of modules 30 arranged in a matrix. The module 30 is configured by mounting a plurality of chip-shaped LED elements 32 in a matrix on a wiring board 31 and attaching a louver film 33 to the surface of each LED element 32. Each LED element 32 is selectively lit by a signal from a control means (not shown) provided in the LED display device, whereby the LED display device can display images such as characters and pictures.
[0022]
The louver film 33 is provided over the entire area of the module 30, and is adhered to each LED element 32 by the adhesive material 34. The louver film 33 includes a light shielding layer 36, and the light shielding layer 36 includes louvers 35 that are parallel to the thickness direction X of the louver film 33 and extend parallel to each other. The louver film 33 can block light in a direction intersecting the thickness direction of the louver film 33 by the light shielding layer 36. 1 and 2 show the thickness of the louver film 33 and the light shielding layer 36 with emphasis.
[0023]
FIG. 4 is an enlarged cross-sectional view showing the louver film 33, and FIG. 5 is a perspective view showing the louver 35. Referring also to FIGS. 1 to 3, the louver film 33 includes a light shielding layer 36 and protective layers 37 and 38 provided on both sides of the light shielding layer 36 in the thickness direction. In the light shielding layer 36, louvers 35 made of cellulose having a thickness of 15 μm are provided at equal intervals at intervals D = 110 μm, and the LED elements 32 of the modules 30 in the horizontal direction in FIG. Extending in the direction perpendicular to the entire length of the module 30. The louver 35 has a light shielding property and blocks light that intersects the louver 35. The light shielding layer 36 including the louver 35 has a thickness of 210 μm, and the height H of the louver 35 is 210 μm. Such a louver film 33 can block light whose angle θ along the plane perpendicular to the louver 35 is more than 30 degrees between the axis L parallel to the thickness direction X. . Between the louvers 35, a light-transmitting synthetic resin such as polyethylene terephthalate is interposed. In the drawing, the thickness of the louver 35 is omitted for easy understanding.
[0024]
Each of the protective layers 37 and 38 is made of a synthetic resin having translucency, such as polyethylene terephthalate, and has a thickness T1 of 50 μm, for example. The protective layers 37 and 38 are bonded to the light shielding layer 36 using curable adhesives 40 and 41, and the louver film 33 has a total thickness T2 of 360 μm. Thus, by using a thin film as the louver film 33, it is possible to prevent the thickness of the LED display device from increasing.
[0025]
The material of each layer 36; 37, 38; 40, 41 constituting such a louver film 33 and the material in the region between the louvers 35 in the light shielding layer 36 are materials having a high light transmittance of, for example, about 90%. The material is selected so as to easily transmit light from each LED element 32, and is selected as a material having a refractive index close to each other, so that reflection of light at the interface of each layer 36; 37, 38; 40, 41 is reduced. In addition, the light from each LED element 32 is easily transmitted. Further, by selecting the adhesive material 34 for attaching the louver film 33 to a material having a refractive index close to that of each of the layers 36; 37, 38; 40, 41 of the louver film 33, at the interface between the louver film 33 and the adhesive material 34. Reflection can be suppressed. More preferably, reflection at the interface between the LED element 32 and the adhesive material 34 can also be suppressed by selecting a filler 50 of each LED element 32 described later as a material having a refractive index close to each other.
[0026]
Thus, by attaching the louver film 33 to the surface of each LED element 32, the angle θ along the plane perpendicular to the louver 35 can be obtained with respect to the thickness direction of the module 30 which is the thickness direction of the louver film 33. It is possible to prevent external light from a direction exceeding 30 degrees from being applied to each LED element 32, and display contents can be easily confirmed from the direction in which the angle θ is 30 degrees or less. Thus, the module 30 has a viewing angle of 60 degrees as a whole, 30 degrees on each side along the plane perpendicular to the louver 35 from the thickness direction of the module 30. In the direction parallel to the louver 35, the field of view is not limited by the louver 35.
[0027]
Of course, as another embodiment of the present invention, a louver extending in a direction intersecting the louver 35 is formed, such as a louver 35 having a lattice shape, and the viewing angle is set along a plane parallel to the louver 35. May be.
[0028]
FIG. 6 is a cross-sectional view illustrating the manufacturing procedure of the module 30. First, as shown in FIG. 6A, an integrated plate 46 in which the chip substrates 45 of the chip-type LED elements 32 are arranged in a matrix is formed. The plate 46 is made of a white liquid crystal polymer, and electrodes 47 made of a conductive material are formed at portions located at the four corners of each portion. Next, two light emitting elements 48 of, for example, red and green composed of light emitting diodes are mounted for each chip substrate 45, and one and the other of each light emitting element 48 are attached to each electrode 47 positioned at four corners of the chip substrate 45. Are electrically connected individually. The light emitting element 48 emits red or green light when energized and lights up. Further, by mounting the light emitting element 48 on the chip substrate 45 made of a white material, the surface of the chip substrate 45 on the side where each light emitting element 48 is mounted functions as a reflecting surface, and the luminance of each LED element 32 is improved. is doing.
[0029]
Next, as shown in FIG. 3 (3), a light-transmitting material, for example, a filler 50 made of an epoxy resin is filled so as to enclose each light-emitting element 48, and in a state of being integrally connected to each other, LED elements 32 are formed respectively. Thereafter, as shown in FIG. 4, the LED element 32 and the LED element 32, that is, the chip substrate 45 and the chip substrate 45 together with the filler 50 are divided, and independent LED elements 32 are respectively formed. Each such LED element 32 is mounted in a matrix on the wiring board 31 constituting the module 30, and a louver film 33 is adhered to the surface of each LED element 32 by an adhesive material 34. In this way, the module 30 is manufactured.
[0030]
The LED display device including such a module 30 is arranged and used along the vertical plane with the louver 35 extending in the horizontal direction outdoors, for example, so that the LED element 32 is irradiated with sunlight as external light. It is possible to prevent the light from being reflected by the LED element 32 and close to the lighting state of the LED element 32, and to increase the contrast between when the LED element 32 is turned on and when the LED element 32 is turned off. Similarly, by arranging the louver 35 along the vertical plane in a state where the louver 35 extends horizontally, the LED element 32 is prevented from being irradiated with light from the illumination provided on the ceiling, which is external light. The effect of can be achieved.
[0031]
Furthermore, since the louver film 33 is adhered to the surface of the LED element 32, there is no need to use a screw member or the like for attaching the louver film 33, and a screw member for attaching the louver film 33 around the LED element 32 or the like. Does not require space for placing. In particular, in an LED display device including a plurality of LED elements 32 as in this embodiment, the LED elements 32 can be arranged as close as possible, and high-detail display can be achieved.
[0032]
Further, the adhesive 34 for adhering the louver film 33 is also filled between the LED elements 32, and the louver film 33 is attached to each LED element 32 in a state where no air bubbles are interposed between the substrate 31 and the louver film 33. Affixed. Thus, when bubbles are interposed, the air without bubbles expands due to the influence of the ambient temperature and the like, and the louver film 33 is peeled off or the louver film 33 is partially raised to be separated from the LED element 32. The light is undesirably refracted, and the display content is not distorted. By interposing bubbles, it is possible to prevent a problem that light is easily reflected at the interface with the bubbles.
[0033]
Further, since the louver 35 is formed in parallel with the thickness direction X of the louver film 33, the louver film 33 does not block light perpendicular to the surface of the LED element 32, and from a direction perpendicular to the surface of the LED element, The display contents can be easily confirmed.
[0034]
Further, the louver film 33 has a protective layer 37 on the side opposite to the LED element 32 of the light shielding layer 36, can protect the light shielding layer 36, and maintains the effect of shielding the outside light by the light shielding layer 36 for a long period of time. It can be easily maintained. In this embodiment, the protective layers 37 and 38 are provided on both sides of the light shielding layer 36, and the strength of the louver film 33 can be further increased.
[0035]
As another embodiment of the present invention, the angle θ1 along the plane perpendicular to the louver 35 from the axis L is set by reducing the height H1 of the louver 35 and setting it to 160 μm as shown by the phantom line in FIG. Can block light from a direction exceeding 45 degrees, and a viewing angle of 90 degrees can be obtained along a plane perpendicular to the louver 35. Thus, the viewing angle can be selected by selecting the thickness of the light shielding layer 36, specifically, the height of the louver 35.
[0036]
FIG. 7 is a side view showing a module 30a constituting an LED display device according to another embodiment of the present invention, FIG. 8 is an enlarged sectional view showing a louver film 33a of the module 30a, and FIG. 9 is a louver. It is a perspective view which shows the louver 35a with which the film 33a is provided. The module 30a of the present embodiment is similar to the module 30 of the embodiment described with reference to FIGS. 1 to 6, and only different configurations will be described, and parts having the same configurations are denoted by the same reference numerals. The description is omitted. The louver film 33a of the module 30a is formed such that the louver 35a of the light shielding layer 36a forms an angle α with respect to the thickness direction X of the louver film 33a.
[0037]
Such a louver film 33a blocks light whose angle θ along the plane perpendicular to the louver 35a exceeds 30 degrees with respect to the axis La forming the angle α with respect to the thickness direction X. Is possible.
[0038]
By sticking the louver film 33a to the surface of each LED element 32 in this way, the axis line La forming the angle α is perpendicular to the louver 35 with respect to the thickness direction of the module 30a which is the thickness direction of the louver film 33a. It is possible to prevent the external light from the direction in which the angle θ along the surface exceeds 30 degrees from being irradiated to each LED element 32, and confirm the display contents from the direction in which the angle θ is 30 degrees or less. can do. The module 30 has a viewing angle of 60 degrees as a whole, 30 degrees on each side along a plane perpendicular to the louver 35 from the thickness direction of the module 30. In the direction parallel to the louver 35, the field of view is not limited by the louver 35. Thus, by tilting the louver 35a in a predetermined direction, it is possible to easily confirm the display contents from around the predetermined direction with the predetermined direction as a center. Even in the configuration in which the louver 35a is inclined as described above, the viewing angle can be selected by selecting the height of the louver 35a. Further, the inclination angle α of the louver 35a may be selected at different angles by a plurality of modules used in one LED display device.
[0039]
FIG. 10 is a front view showing a module 130 constituting an LED display device according to still another embodiment of the present invention, and FIG. 11 is an enlarged perspective view showing a part of the module 130. The module 130 has a configuration similar to that of the module 30 having the form described with reference to FIGS. 1 to 6, only different configurations will be described, and parts having the same configuration are denoted by the same reference numerals. The description is omitted. In the module 30 of the above-described form, the louver film 33 is provided over the entire area of the module 30, but in the module 130 of the present form, the louver film 33 is individually attached to each LED element 32. Although the louver film 33 is stuck to each LED element 32 by the same adhesive material 34, the thickness of the adhesive material 34 layer is abbreviate | omitted and shown in FIG.
[0040]
The LED display device including such a module 130 can also achieve the same effect as the LED display device including the module 30 described above. Furthermore, by sticking the louver film 33 for each LED element 32, a useless louver film 33 is not required between the LEDs, and the required amount of the louver film 33 can be reduced. Compared with the configuration in which the louver film 33 is provided between the LED elements 32, bubbles are less likely to be interposed between the wiring board 31 and the louver film 33, and the above-described problems due to the bubbles are less likely to occur. Further, unlike the case where the louver film 33 is pasted over the entire area of the module 30, it is not necessary to fill the narrow space between the LED elements 32 with the sticking material 34, and there is a bubble in such a difficult space to fill. And the occurrence of defects due to bubbles as described above can be reduced.
[0041]
Moreover, in the structure which sticks a louver film separately to such an LED element 32, you may use the louver film in which a louver inclines with respect to the thickness direction as a louver film. Furthermore, you may change the inclination-angle and inclination direction of a louver for every LED element.
[0042]
FIG. 12 is a cross-sectional view showing the manufacturing procedure of the module 130, and FIG. 13 is a perspective view for explaining the manufacturing procedure of the module 130. First, as shown in FIG. 12A, an integrated plate 46 in which the chip substrates 45 of the chip-type LED elements 32 are arranged in a matrix is formed. The plate 46 is made of a white liquid crystal polymer, and electrodes 47 made of a conductive material are formed at portions located at the four corners of each portion. Next, two light emitting elements 48 of, for example, red and green composed of light emitting diodes are mounted for each chip substrate 45, and one and the other of each light emitting element 48 are attached to each electrode 47 positioned at four corners of the chip substrate 45. Are electrically connected individually. Thus, by mounting the light emitting element 48 on the chip substrate 45 made of a white material, the surface of the chip substrate 45 on which each light emitting element 48 is mounted functions as a reflecting surface, and the brightness of each LED element 32 is increased. Has improved.
[0043]
Next, a light-transmitting material, for example, a filler 50 made of an epoxy resin is filled so as to enclose each light emitting element 48, and each LED element 32 is formed in a state of being integrally connected to each other. Thus, the louver film 33 having the same size as the plate 46 is connected to each LED element 32 from above the filler 50 as shown in FIGS. 12 (3) and 13 (1). Stick to the surface. Thereafter, as shown in FIGS. 12 (4) and 13 (2), for example, using the blade 55, the LED element 32 and the LED element 32, that is, together with the louver film 33 and the filler 50, The chip substrate 45 is separated from each other to form independent LED elements 32 as shown in FIG. Such LED elements 32 are mounted in a matrix on the wiring board 31 constituting the module 130. In this way, the module 130 is manufactured.
[0044]
Thus, after sticking the louver film 33 on the surface of the panel 46 on which the plurality of LED elements 32 are arranged, the LED element 32 and the LED element 32 are divided, so that the panel 46 is divided and then divided. Compared to the case where the louver film 33 is attached to the small LED element 32, the LED element 32 to which the louver film 33 is attached can be easily manufactured.
[0045]
The above-described embodiment is merely an example of the present invention, and the configuration can be changed within the scope of the present invention. For example, the louver film has a protective layer only on one side in the thickness direction of the light-shielding layer, and an adhesive material is formed on the other side by applying an adhesive material. You may make it stick and reduce the effort of sticking work. Further, the material such as the louver and the dimensions such as the louver interval can be appropriately changed.
[0046]
【The invention's effect】
According to the present invention, a louver film is attached to the surface of the LED element, and the louver film has a light shielding layer including a louver that blocks light in a direction intersecting the thickness direction. Thereby, it can prevent that the external light from the direction which cross | intersects the thickness direction of a louver film is irradiated to a LED element. Therefore, it can be prevented that the LED element is irradiated with external light, and the light is reflected by the LED element, and the LED element is close to the lighting state, and the contrast between when the LED element is turned on and when the LED element is turned off can be reduced. Can be high.
[0047]
  Furthermore, since the louver film is attached to the surface of the LED element, there is no need to use a screw member or the like for attaching the louver film, and a screw member or the like for attaching the louver film around the LED element is arranged. Does not require space. In particular, in an LED display device having a plurality of LED elements, it is possible to arrange the LED elements adjacent to each other as much as possible by reducing the interval between the LED elements.AhHigh-detail display is possible.And since a louver film is not stuck between each LED element, the quantity of a required louver film can be decreased. Thus, a liquid crystal display device capable of high-detail display and high contrast can be realized using a small amount of louver film.
[0049]
Furthermore, according to the present invention, since the louver is formed in parallel with the thickness direction, it does not block light perpendicular to the surface of the LED element, and the display content can be easily confirmed from the direction perpendicular to the surface of the LED element. can do.
[0050]
Furthermore, according to the present invention, since the louver is formed at a predetermined angle with respect to the thickness direction, light in a direction at a predetermined angle with respect to the thickness direction is not blocked, and from this direction, The display contents can be easily confirmed.
[0051]
Furthermore, according to this invention, the said louver film has the protective layer which consists of a synthetic resin which has translucency at least on the opposite side to the LED element of a light shielding layer. Thereby, the light shielding layer can be protected by this protective layer, the effect of shielding the outside light by the light shielding layer can be maintained for a long period of time, and the maintainability is excellent.
[0052]
Furthermore, according to the present invention, the LED element and the LED element are divided after the louver film is pasted on the surface of the panel on which the plurality of LED elements are arranged. Compared with the case where a louver film is attached to a small LED element, an LED element attached with a louver film can be easily manufactured.
[Brief description of the drawings]
FIG. 1 is a side view showing a module 30 constituting an LED display device according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a module 30. FIG.
3 is a front view showing a module 30. FIG.
4 is an enlarged cross-sectional view of a louver film 33. FIG.
5 is an enlarged perspective view showing a louver 35. FIG.
6 is a cross-sectional view showing the procedure for manufacturing the module 30. FIG.
FIG. 7 is a side view showing a module 30a constituting an LED display device according to another embodiment of the present invention.
FIG. 8 is an enlarged sectional view showing a louver film 33a.
FIG. 9 is an enlarged perspective view showing a louver 35a.
FIG. 10 is a front view showing a module 130 constituting an LED display device according to still another embodiment of the present invention.
11 is an enlarged perspective view showing a part of the module 130. FIG.
12 is a cross-sectional view showing the procedure for manufacturing the module 130. FIG.
13 is a perspective view for explaining a manufacturing procedure of the module 130. FIG.
14 is an exploded perspective view showing a conventional LED display device 1. FIG.
FIG. 15 is a cross-sectional view showing another conventional LED display device 5;
FIG. 16 is a side view showing still another conventional LED display device 10;
17 is a perspective view showing the manufacturing procedure of the LED display device 10. FIG.
[Explanation of symbols]
30 modules
31 Wiring board
32 Chip LED element
33 louver film
34 Adhesive material
35 louvers
36 Shading layer
37,38 Protective layer
α Inclination angle of louver
θ, θ1 Viewing angle

Claims (5)

A plurality of LED elements, and a louver film having a light shielding layer including a louver that blocks light in a direction intersecting the thickness direction,
A louver film is individually attached to each LED element. The LED display device according to claim 1 , wherein the louver of the louver film is formed in parallel with a thickness direction . The louver of the louver film, LED display device according to claim 1 Symbol mounting, characterized in that the thickness direction is formed at an angle. The louver film, at least the light-shielding layer opposite to the LED element with respect to, LED display device according to any one of claims 1-3, characterized in Rukoto that having a protective layer made of a synthetic resin having translucency . After attaching a louver film having a light shielding layer with a louver that blocks light in a direction intersecting the thickness direction on the surface of a panel in which a plurality of LED elements are arranged in a matrix, the LED element and the LED element are divided. method for producing L ED display you characterized by.

Images