JP5995503B2 - Video display device - Google Patents

Description

  The present invention relates to a full-color video display device that performs display by causing a number of light emitting elements such as R (red), G (green), and B (blue) to emit light.

In general, an image display apparatus is configured by arranging a large number of display units each composed of a light emitting element or the like on a plane. Light emitting diodes (LEDs) have come to be used as light emitting elements, and the arrangement and arrangement pitch of the light emitting elements can be designed arbitrarily, so that video display devices with various resolutions and brightness can be configured according to the application. It was.
In general, the display unit, which is the smallest structural unit of a video display device, blocks external light emitted from the sun or illumination on the front surface of a substrate on which a large number of RGB light emitting elements, which are single color, two colors, or the three primary colors of light, are arranged, A device in which a louver that acts so as to make it difficult for a light beam to directly enter an LED is arranged. There are louvers that have a plate shape corresponding to a plurality of solid state light sources and an arc shape that corresponds to a single solid state light source having a circular light emitting part. The shape of each louver corresponding to a single solid state light source is a circle. The arc-shaped technique is described in conventional literature (see, for example, Patent Literature 1 and Patent Literature 2).

JP-A-6-60710 Japanese Patent Laid-Open No. 11-73125

  In conventional video display devices, external light such as sunlight or indoor illumination light leaks from the gap between arcuate louvers arranged on the top of one LED or a plurality of LED assemblies, thereby degrading the contrast of the display surface. There is a problem that good image quality cannot be obtained.

  The present invention has been made to solve the above-described problems, and an image display device having good display contrast and good display characteristics without external light leaking and entering the display surface is obtained. With the goal.

An image display device according to the present invention includes a flat substrate, a plurality of solid light sources disposed on the front surface of the substrate, and a plurality of openings disposed on the front surface of the substrate and exposing the solid light sources. A louver having a flat plate shape, the louver projecting forward from the substantially flat plate front surface, partially surrounding the periphery of the opening , and outward from the periphery of the opening in the in-plane direction of the louver. The flange includes an extending flange, and the flange is formed in an arc shape that protrudes upward along the upper periphery of the opening, and has a protruding portion that protrudes upward from the arc-shaped top. Is.
The image display device according to the present invention includes a flat substrate, a plurality of solid light sources disposed on the front surface of the substrate, and a plurality of openings disposed on the front surface of the substrate to expose the solid light sources. The louver protrudes forward from the substantially flat plate front surface, partially surrounds the periphery of the opening, and extends in the in-plane direction of the louver from the periphery of the opening. An intermediate light-shielding plate that includes an eaves portion that extends outward, the plurality of openings are arranged in a matrix, and shields outside light at a position that is intermediate between the four openings arranged in two rows and two columns in the louver. Is provided.

In the video display device of the present invention, the collar provided on the louver not only partially covers the periphery of the opening, but also has a portion extending from the periphery of the louver opening to the outside in the in-plane direction of the louver . Therefore, it is possible to block external light incident on the display surface of the video display device in a wide range, and display characteristics can be improved.

It is the front view of the display unit of the video display apparatus of Embodiment 1 of this invention, a side view, and sectional drawing. It is a front view which shows the external light shielding characteristic from the directly above direction of the video display apparatus of Embodiment 1 of this invention. It is a front view which shows the external light shielding characteristic from the diagonal direction of the video display apparatus of Embodiment 1 of this invention. It is a front view which shows the drainage characteristic at the time of the rain of the video display apparatus of Embodiment 1 of this invention. It is a front view of the display unit of the video display apparatus of Embodiment 2 of this invention. It is a front view of the display unit of the video display apparatus of Embodiment 3 of this invention. It is a front view which shows the collar part modification of the louver in the video display apparatus of Embodiment 4 of this invention. It is a front view, a side view, and a cross-sectional view of a display unit necessary for explanation of the present invention. FIG. 2 is a front view of a video display apparatus necessary for explanation of the present invention, and is a diagram showing a light shielding characteristic when external light is incident from directly above. It is a front view of the video display apparatus required for description of this invention, and is the figure which showed the light-shielding characteristic when external light injects from the diagonal direction.

Embodiment 1 FIG.
First, the structural improvement of the arcuate collar portion of the louver corresponding to each LED light emitting element will be examined.
FIG. 8 is a diagram necessary for explaining the present invention, and is a front view (FIG. 8 (a)) and side view of a display unit 200 in which the louver 35 is provided with an arcuate collar portion 35a corresponding to each LED display element 2. It is a figure (FIG.8 (b)) and sectional drawing (FIG.8 (c)). FIGS. 9 and 10 are front views in the case where the video display device 2000 is configured by arranging the display units 200 in the vertical direction and the horizontal direction in the horizontal direction, and the external light 21 is applied to the display surface from directly above and obliquely, respectively. The light blocking characteristics when incident are shown.

  As shown in FIG. 8, the display unit 200 has a structure in which a louver 35 is disposed on the front surface thereof, and the LED light emitting element 2 is exposed from an opening 2 a provided in the flat plate portion 3 c of the louver 35. 2 are arranged in a matrix on a substrate (wiring substrate) 4, and the substrate 4 and the louver 35 are assembled to the housing case 5. In the conventional example, as shown in FIG. 8A, arcuate flanges 35 a corresponding to the respective LED light emitting elements 2 are arranged around the opening 2 a of the louver 35. As shown in FIGS. 9 and 10, the video display device 2000 is installed such that the gap dimension between the adjacent display units 200 and the gap dimension between the arcuate flange portions 35 a are the same or substantially the same. ing.

Here, in FIG. 9, the video display device 2000 having the arc-shaped collar portion 35 a corresponding to each LED display element 2 of FIG. 8 is placed in a sunny outdoor environment or in an indoor environment under bright illumination, and the display surface is set in the vertical direction. In the case of being installed upright, external light 21 from sunlight or illumination light (a light source is indicated by reference numeral 20) is irradiated vertically downward (from directly above) to the image display device 2000. The front view of the video display apparatus 2000 showing the surface state (light-shielding characteristic) of the video display apparatus 2000 is shown.
Further, in FIG. 10, the light shielding characteristics of the image display device 2000 when the external light 21 is incident from an oblique direction with respect to the image display device 2000 provided with the arc-shaped flange portion 35 a corresponding to each LED display element 2 of FIG. 8. The front view showing is shown.

As shown in FIG. 9, when the external light 21 is irradiated vertically downward with respect to the conventional video display device 2000, the light shielding area shielded by the arcuate collar 35 a is displayed on the display surface of the video display device 2000. 22b looks dark and dark, but the non-light-shielding region 23a where the external light 21 leaks in the vertical direction from the gaps between the plurality of arcuate flanges 35a is brightened by the external light 21 and appears white. Become.
Also, as shown in FIG. 10, when the external light 21 is irradiated obliquely upward from the conventional video display device 2000, the light shielding region 22c by the arc-shaped flange portion 35a is formed on the display surface of the video display device 2000. And the outside light 21 leaks in an oblique direction from the gaps between the plurality of arc-shaped flanges 35a to form a non-shielding region 23b. The non-shielding region 23b becomes bright and looks whitish.

  The conventional image display device 2000 shown in FIGS. 8 to 10 has insufficient external light shielding characteristics, and the display surface may appear white due to external light incident directly above or obliquely. . Therefore, when installed in an outdoor environment or an indoor environment under bright illumination, the external light 21 such as sunlight or indoor illumination light shines from directly above or obliquely, and the adjacent LED light emitting elements 2 By leaking from the gap (gap) between the arcuate flanges 35a arranged at the upper part, the dark luminance (non-lighting (black) luminance) of the display surface of the video display device 2000 increases, The contrast ratio (brightness when lit white / brightness when not lit (black)) is reduced, resulting in the loss of sharpness between white and black in the display content, resulting in problems such as deteriorating the image quality of the video display device. .

Therefore, in the present invention, the flange portion that protrudes forward on the front surface of the louver is provided as an intermediate light shielding plate not only on the upper portion of the opening portion 2a that exposes the solid light source but also on the upper portion between the two adjacent opening portions 2a. Thus, it is proposed that the incident of the external light 21 from directly above is shielded by the intermediate light shielding plate.
Further, in the present invention, the incident of the external light 21 from the oblique direction is provided with a vertical projecting portion extending vertically in addition to the conventional arc-shaped flange portion 35a, and the flange portion is formed in an inverted Y shape. It is proposed to prevent it by configuring.

  By additionally providing the intermediate light shielding plate and the vertical protrusion on the louver as described above, even if the outside light 21 such as sunlight or indoor illumination light is irradiated from directly above the louver, the intermediate light shielding plate Shadows remain on the display surface, and even when irradiated from diagonally above the louver, the shadows shielded by the arcuate collar 3a and the vertical protrusions remain on the display surface, so the display surface becomes blacker As a result, compared with the conventional video display device, the darkness of the display surface (non-lighting (black) brightness) decreases, and the contrast ratio of the display surface when lit (white brightness / non-lighting). When the lighting (black brightness) is increased, the white and black of the display content are sharpened, so that a high-quality full-color video display device can be provided.

Hereinafter, Embodiment 1 of the present invention will be described in detail. FIG. 1 is a diagram showing a display unit 10 which is the minimum structural unit of the video display device of the present invention. FIG. 1 (a) is a schematic front view of the display unit 10, and FIG. 1 (b) is a right side of the display unit 10. FIG. 1C is a sectional view taken along the line AA, which is a vertical section of FIG.
As shown in FIG. 1, the display unit 10 includes a substrate (wiring substrate) 4 in which a plurality of LED display elements (solid light sources) 2 made of LEDs or a plurality of LED aggregates are arranged in a matrix. It is mainly composed of a louver (matrix louver) 3 that shields external light from sunlight, illumination, or the like corresponding to the two LED light emitting elements 2 and a housing case 5, and the louver 3 has a substantially flat plate shape and has a base portion. And has an arc-shaped flange 3aa protruding forward from the front surface of the flat plate portion 3c so as to partially surround the periphery (upper portion) of the opening 2a exposing the LED light emitting element 2. around the top parts 2a (arc position corresponding to the top of the arc-shaped eaves portion 3aa.) above the direction vertical protrusion extending (outside the plane direction of the louver 3) (projecting portion) Having ab, it is characterized by comprising a reverse Y-shaped eaves portion 3a.
Further, the plurality of openings 2a of the louver 3 are arranged in a matrix, and an intermediate for blocking the external light 21 at a position (center) between the four openings 2a arranged in 2 rows and 2 columns in the louver 3 The light-shielding plate 3b is provided.

Here, when the outer peripheral shape of the opening portion 2a of the louver 3 is substantially circular, the example in which the flange portion 3a has the arc-shaped flange portion 3aa surrounding a part of the outer periphery has been shown. Is not limited to a circle, and may have various shapes. In this case, the shape of the flange 3a is also deformed in accordance with the outer peripheral shape of the opening.
The LED light-emitting element 2 is an RGB three-color cannonball type 1 in 1 LED light-emitting element that is the three primary colors. The light emitting element is constituted by a light emitting diode.
The louver 3 is formed of a black resin having a high external light shielding property and high weather resistance, such as a polycarbonate resin, an acrylic resin, and an epoxy resin.

  Next, operations and effects of the video display apparatus according to Embodiment 1 of the present invention will be described. As shown in FIG. 2, in the video display device 1 in which the display units 10 of FIG. 1 according to Embodiment 1 of the present invention are configured by arranging two vertical units × two horizontal units, the video display device 1 is placed on a sunny day or When installed in an indoor environment under bright illumination, the display screen of the video display device 1 when the external light 21 is irradiated vertically downward on the video display device 1 is arranged side by side in the lateral direction. The external light 21 that has entered the gap between the intermediate light shielding plates 3b is a collar (a collar 3a having an arcuate collar 3aa and a vertical protrusion 3ab) positioned below the gap between the intermediate light shielding plates 3b. Arc-shaped louver with a vertical louver.) By the shadow shielded by 3a, almost the entire area of the display surface becomes the light-shielding area 22a, and the dark luminance of the louver 3 is lowered (blackish) as a whole. .

Further, as shown in FIG. 3, when the external light 21 from sunlight or illumination light is irradiated on the video display device 1 obliquely from above, the display surface of the video display device 1 is adjacent to the louver 3. The external light 21 that has entered the gap between the two corresponding flanges 3a is shielded by the flange 3a formed below the gap between the intermediate light shielding plates 3b, and almost the entire display surface is shielded by the shielded shadow. The region 22a is reached, and the louver dark brightness is reduced (becomes dark).
Accordingly, when installed outdoors or in an indoor environment under bright illumination, the darkness of the display surface of the image display device 1 (the luminance when not lit (black)) decreases, and the contrast ratio of the display surface when lit (white) The brightness at the time of lighting / the brightness at the time of non-lighting (black) increases, and as a result, a high-quality image in which white and black of the display content are effective can be displayed.

  FIG. 4 is a front view of the video display device 1 showing a path trajectory through which the rainwater 24 flows down in rainy weather, showing the drainage characteristics during the rain of the video display device 1 of the present invention. Even when rainwater 24 pours into the image display device 1 in the rain, water drops do not accumulate on the upper portion of the flange portion 3a and the intermediate light shielding plate 3b of the louver 3, and the flow path of the rainwater 24 to the flat plate portion 3c of the louver 3 in FIG. As shown by the locus 25, the rainwater 24 flows down along the arcuate louver shape of the collar portion 3 a and the intermediate light shielding plate 3 b, so that even when the image display device 1 is turned on, the light emitted from the solid light source 2 emits water droplets. High-quality video can be displayed without being scattered by.

The louver 3 is preferably formed of a black resin in order to improve the light shielding characteristics.
Further, by applying a transparent matte coating or a black matte coating on the front surface of the louver 3, it is possible to prevent the display surface from being shining as compared with a case where the matte coating is not used.
Further, by applying hydrophilic coating to the front surface of the louver 3, when there is rain on the display surface, the rain does not have a shape of raindrops, and water smoothly flows along the display surface. Therefore, the video display device 1 having good display characteristics can be obtained.
Further, by applying a hydrophilic coating on the back surface of the louver 3, rainwater can flow along the back surface of the louver 3 even when rainwater enters the back surface of the louver 3. Since rainwater does not easily collect between the two and the front surface of the louver 2 does not easily leak out, high-quality images can be displayed without scattering light emitted from the solid light source 2 by water droplets.

In the first embodiment, the intermediate light shielding plate 3b has an arc shape as shown in FIG. 1, but is not limited to this shape, and is not limited to this shape. It can be used in various ways as long as the light shielding characteristics and drainage characteristics are obtained.
Further, the DIP type bullet-type LED light emitting element has been described as an example. However, the present invention is not limited to this, and a surface-mount type LED light emitting element may be adopted. For example, three primary colors R, G, B, A similar effect can be obtained with a 3-in-1 LED light-emitting element on which three-color LED chips are mounted.
Further, in the first embodiment, a display unit 10 in which a total of 16 bullet-shaped LED light emitting elements 2 that are solid light sources are arranged in a vertical direction and a horizontal direction in FIG. 1 and FIG. 2 will be described as an example. However, the present invention is not limited to this, and the same effect can be obtained even when an arbitrary number of solid light sources are arranged in both the vertical and horizontal directions.

Embodiment 2. FIG.
In the above-described first embodiment, the example in which the flange 3a having the intermediate light shielding plate 3b and the vertical protrusion 3ab is provided in the louver 3 has been described. However, in the second embodiment, FIG. As shown in the front view, the louver 31 is characterized in that the intermediate light shielding plate 3 b is not provided, and only the flange 3 a is formed around the opening 2 a of the louver 31.
In the first embodiment described above, the intermediate light shielding plate 3b is necessary to prevent the external light 21 from entering the gap region between the two openings 2a from directly above. For example, in the case where the video display device 1 is installed in a place where only the external light 21 from the oblique direction is assumed, the external light from the oblique direction can be prevented even when the intermediate light shielding plate 3b is omitted as in the louver 31. It is possible to obtain a video display device with good display characteristics.
Further, when the installation location is a location where external light incidence from directly above is assumed, both end portions of the arc-shaped flange portion 3aa surrounding the upper periphery of the opening 2a are respectively narrowed in the direction of narrowing the gap region. Needless to say, it is possible to prevent the incidence of external light from directly above by changing the protrusions so that the ends of adjacent arc-shaped flanges 3aa are brought into contact with each other.

Embodiment 3 FIG.
In the above-described first embodiment, the case where the ridge portion 3a of the louver 32 includes the arc-shaped ridge portion 3aa and is disposed at the upper periphery of the opening 2a of the louver 32 is illustrated. Then, as shown in the display unit 12 in FIG. 6, not only the upper part around the opening 2a of the louver 32 but also the extending parts extending downward from both ends of the arcuate flange 3aa on both sides around the opening 2a ( An example in which an extended portion 3d is additionally provided will be described. The extending portion 3d, which is a vertical louver extending downward from the left and right end portions of the arc-shaped flange portion 3aa, can block the external light 21 from the lateral direction, further improving the display characteristics of the video display device 1. Can be improved.
Further, it goes without saying that the length of the protruding portion 3ab of the flange portion 3a of the louver 32 and the length of the extended extension portion 3d are optimized according to the characteristics of the video display device 1 such as contrast and viewing angle. Yes. Furthermore, the extending portion 3d is not extended only in the vertical direction, but is deformed in a range that does not impair the light shielding characteristics and drainage characteristics, extends in an oblique direction, and is not limited to a straight line. It is also possible to form the shape.

Embodiment 4 FIG.
In the first embodiment described above, the flange 3a formed around the opening 2a of the louver 3 is formed by the arc-shaped flange 3aa and the protrusion 3ab that protrudes upward from the top of the arc. When viewed, it shows an inverted Y-shape, and an example in which the arc-shaped flange 3aa and the protruding portion 3ab are integrally formed without the flat plate portion 3c is shown.
In the fourth embodiment, an enlarged view of the display surface of the display unit 13 is shown in FIG. 7, and as shown in a modification of the flange 33 a, the flange 33 a has an arc shape surrounding the upper periphery of the opening 2 a of the louver 33. It is characterized by having an arcuate flange 3aa which is a portion and a vertical protrusion 3e extending downward from the lower end of the opening 2a. In the case of the flange portion 33a of FIG. 7, the shape observed from the front is not an inverted Y shape, and the arc-shaped flange portion 3aa and the protruding portion 3e are arranged apart from each other. As described above, the protruding portion 3e is not directly connected to the arc-shaped flange portion 3aa and is integrated with the flat plate portion 3c, but can block the external light 21 incident from an oblique direction. It is possible to obtain good display characteristics.

FIG. 7 shows an example in which the protrusion 3e protrudes straight downward from the lower end of the opening 2a when the display surface is viewed from the front. However, the protrusion 3e has a curved shape. It can be used with various deformations in consideration of the direction of incident external light depending on the installation environment, such as increasing the number of lines, or forming a shape in which a single line branches off from the middle. As long as the light shielding characteristics and the drainage characteristics can be maintained, such a modified example can be used in correspondence with the light shielding plates of the first to third embodiments.
In the present invention, it is needless to say that the embodiments can be freely combined within the scope of the invention, and that the embodiments can be appropriately modified and omitted.

1, 2000 Video display device 2 LED display element (solid light source)
2a Opening part 3, 31, 32, 33, 35 Louver 3a, 33a Ridge part 3aa, 35a Arc-shaped saddle part 3ab, 3e Protruding part (protruding part)
3b Intermediate light shielding plate 3c Flat plate part 3d Extension part (extension part)
4 Board (wiring board)
5 Housing case 10, 11, 12, 13, 200 Display unit 20 Light source 21 External light 22a, 22b, 22c Light-shielding area 23a, 23b Non-light-shielding area 24 Rainwater 25 Flow path locus.

Claims (4)

A flat substrate, a plurality of solid light sources disposed on the front surface of the substrate, a louver having a substantially flat plate shape formed with a plurality of openings disposed on the front surface of the substrate and exposing the solid light sources, The louver protrudes forward from the front surface of the substantially flat plate, partially surrounds the periphery of the opening , and includes a flange extending outward from the periphery of the opening in the in-plane direction of the louver ,
The collar is formed in an arc shape projecting upward along the upper periphery of the opening, and has a projecting portion projecting upward from the top of the arc shape. Display device. A flat substrate, a plurality of solid light sources disposed on the front surface of the substrate, a louver having a substantially flat plate shape formed with a plurality of openings disposed on the front surface of the substrate and exposing the solid light sources, The louver protrudes forward from the front surface of the substantially flat plate, partially surrounds the periphery of the opening, and includes a flange extending outward from the periphery of the opening in the in-plane direction of the louver,
A plurality of the openings are arranged in a matrix, and an intermediate light shielding plate for shielding outside light is provided at a position intermediate between the four openings arranged in two rows and two columns in the louver. be that movies image display device. The visor portion is formed in an arc shape protruding upward along the periphery upper portion of the opening, characterized in that it has a projecting portion formed to project upward from the top of the arcuate claims Item 3. The video display device according to Item 2 . The video display device according to claim 1 , wherein the flange has an extending portion extending downward from both ends.

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