Indicator

Abstract

To provide a display machine which can secure waterproofness even if the machine is installed outside and has a configuration which allows sound to be easily transmitted to a viewer in front of the machine.SOLUTION: In a display machine including a pair of speakers 41 and 42 which can discharge sound to the outside from respective sound emission holes 41a and 42a, the pair of sound emission holes which a pair of speakers have are arranged on a back plate in two positions which are symmetrical to each other in a first direction or a second direction orthogonal to the first direction. A pair of sound emission holes are covered by a pair of sound emission hole covers 41b and 42b having a pair of notch parts which can discharge sound to the outside. At least one of the pair of the sound emission hole covers is covered by guide covers 41c and 42c having tip openings 41e and 42e at tip parts. The guide covers extend to the outside of the back plate along a direction in which the pair of sound emission holes are arranged, and are guided along an outer face of a side plate positioned in an extending destination, and the respective tip openings are arranged to face a front side X1.SELECTED DRAWING: Figure 14

Description

[Technical Field]

[0001] The present invention relates to a display device that has a display unit capable of displaying videos or images on a front surface panel, and that is particularly suitable for installation outdoors or indoors near a window where it is exposed to direct sunlight. [Background technology]

[0002] In the electric display device described in Patent Document 1 and the display device described in Patent Document 2, a speaker is arranged on the side of the rectangular parallelepiped housing, and emits voices and sound effects related to the images and videos of advertisements, etc. displayed on the LCD monitor on the front, thereby increasing the attraction of the advertisements, etc. to the viewer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Design Registration No. 1450231 [Patent Document 2] Japanese Patent Application Publication No. 2019-15803 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the electric display device described in Patent Document 1 and the display device described in Patent Document 2 are intended to be installed outdoors or indoors in stores, etc., and therefore, in a configuration that only has sound emission holes on the side, there is a risk that the internal speaker will malfunction if rain or dew gets in, and there are also cases where the sound emitted from the speaker is not transmitted sufficiently to a person looking at the LCD monitor from the front due to the presence of surrounding noise.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a display device that can ensure waterproofing even when installed outdoors and that has a structure that allows sound to be easily transmitted to viewers in front. [Means for solving the problem]

[0006] In order to solve the above problems, the display device of the present invention is a display device comprising a housing, a square-shaped face plate covering the front of the housing, a rectangular back plate facing the face plate and covering the back of the housing, a display unit capable of displaying a video or image on the face plate, and a pair of speakers capable of emitting sound to the outside from each of the sound emission holes, wherein the housing has four side plates extending from four sides of the back plate to four sides of the face plate, and the four side plates extend along a first direction or a second direction perpendicular to the first direction, and the pair of speakers each have a pair of sound emission holes The sound output holes are arranged at two positions symmetrical to each other in the first direction or the second direction on the rear panel, and the pair of sound output holes are covered by a pair of sound output hole covers, each having a pair of cutout portions that allow sound to be emitted to the outside, and at least one of the pair of sound output hole covers is covered by a guide cover that has a sound output opening at its tip, and the guide cover extends outward from the rear panel along the direction in which the pair of sound output holes are arranged, and is guided along the outer surface of the side panel located at the end of its extension, and is arranged so that each sound output opening faces forward.

[0007] In the display device of the present invention, it is preferable that the pair of speakers are arranged along the horizontal direction, and the pair of sound emission hole covers are covered by the pair of guide covers, respectively.

[0008] In the display device of the present invention, it is preferable that the pair of sound emission hole covers have the same shape, and when fixed to the back panel, the pair of cutout portions are open in the same direction. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a display device that can ensure waterproofing even when installed outdoors and that has a structure that allows sound to be easily transmitted to a viewer in front. [Brief explanation of the drawings]

[0010] [Figure 1] 1A to 1C are diagrams showing the configuration of a display device according to an embodiment of the present invention, in which (a) is a plan view, (b) is a front view, and (c) is a bottom view. [Figure 2] 1A and 1B are diagrams showing the configuration of a display device according to an embodiment of the present invention, in which (a) is a left side view and (b) is a right side view. [Figure 3] FIG. 2 is a rear view showing the configuration of the display device according to the embodiment of the present invention. [Figure 4] 1 is an exploded perspective view of a display device according to an embodiment of the present invention. [Figure 5] FIG. 2 is a front view showing the internal configuration of the display device according to the embodiment of the present invention. [Figure 6] FIG. 6 is an enlarged view of a portion E1 in FIG. 5. [Figure 7] FIG. 2 is a functional block diagram of a display device according to an embodiment of the present invention. [Figure 8] 6 is a simplified cross-sectional view of the display device according to the embodiment of the present invention taken along line C1-C1' in FIG. 5.

[0023] FIG. [Figure 9] (a) is an exploded perspective view of the first light guide member, the second light guide member, the first stay, the second stay, and the third stay, while (b) shows the first light guide member, the second light guide member, the first stay, the second stay, and the third stay of (a) in an assembled state. [Figure 10] FIG. 1(a) is a front view showing the schematic positional relationship between the first light-guiding member and the second light-guiding member and the first light-emitting surface in an embodiment of the present invention, and FIG. 1(b) is a front view showing the schematic positional relationship between the first light-guiding member and the second light-guiding member and the first light-emitting surface in a modified example. [Figure 11] 1 is a diagram showing a schematic arrangement relationship between six light guide members and light emitting surfaces corresponding to four LEDs, as viewed from the front, in an embodiment of the present invention. FIG. [Figure 12] FIG. 2 is an exploded perspective view of a sound emission hole cover and a guide cover according to an embodiment of the present invention. [Figure 13] 1A is a perspective view showing the relative positions of the guide cover, the sound output hole cover, and the speaker, and FIG. 1B is a perspective view showing the state when the sound output hole is covered with the guide cover and the sound output hole cover. [Figure 14] 6 is a simplified cross-sectional view of the display device according to the embodiment of the present invention taken along line C2-C2' in FIG. 5.

[0023] FIG. [Figure 15] FIG. 2 is a perspective view of the display device in a horizontally placed state. DETAILED DESCRIPTION OF THE INVENTION

[0011] A display device 100 according to an embodiment of the present invention will be described in detail below with reference to the drawings. In the following description, the Z1-Z2 direction shown in FIG. 1(b) will be referred to as the longitudinal direction or up-down direction, the Y1-Y2 direction will be referred to as the width direction or left-right direction, and the X1-X2 direction shown in FIGS. 1(a) and 1(c) will be referred to as the thickness direction or front-back direction. When the display device 100 is placed vertically as shown in FIGS. 1 to 3, the up-down direction (Z1-Z2 direction) is aligned with the vertical direction. When the display device 100 is placed horizontally as shown in FIG. 15, the right side (Y2 side) is the upper side, and the width direction (Y1-Y2 direction) is aligned with the vertical direction. In addition, the direction away from the housing 10 may be referred to as the outside. In FIG. 8, the flow of exhaust air is indicated by an arrow, and in FIGS. 13 and 14, the flow of sound is indicated by an arrow. In the following description, "air" refers to air within the housing 10 as well as gas introduced for purposes such as cooling.

[0012] The display device 100 can be installed and used, for example, outdoors or in front of a store exposed to direct sunlight, as well as indoors by a window, and is installed facing a storefront or a road. As shown in FIGS. 1 to 3, the display device 100 has a vertically long rectangular shape when viewed from the front (X1 side) and the back (X2 side), and includes a metal housing 10 (see FIG. 4) with an overall flat surface. As shown in FIG. 4, a square-shaped face panel 61 is attached to cover a front opening 102 (front) of the housing 10, and as shown in FIG. 3, a back panel 63 is attached to cover a rear opening (not shown) of the housing 10. An internal board 16 is disposed in front of the back panel 63 within the housing 10 and fixed to the housing 10. The face panel 61 is made of transparent glass or resin, and the back panel 63 is made of synthetic resin or metal.

[0013] 4, the housing 10 includes a rear panel 63 that is rectangular when viewed from the front and faces the front panel 61, and four side panels that extend along the thickness direction of the rear panel 63 toward the corresponding four sides of the rectangular front panel 61 and the rear panel 63, namely, a left side panel 11 (first side panel), a bottom panel 12 (second side panel), a right side panel 13 (third side panel), and a top panel 14 (fourth side panel). Here, the left side panel 11 and the right side panel 13 extend parallel to each other in the same direction, and if this direction is defined as a first direction, the bottom panel 12 and the top panel 14 that extend parallel to each other extend in a second direction that is perpendicular to the first direction.

[0014] On the faceplate 61 side of the internal substrate 16, there are arranged six light-guiding members 21, 22, 23, 24, 25, 26, four LEDs 31, 32, 33, 34 (light-emitting diodes), a first speaker 41, a second speaker 42, six stays 51, 52, 53, 54, 55, 56, an exhaust fan 71, an exhaust duct 72, an intake duct 74, a control board including the control unit 90, and a power supply board 97. The exhaust fan 71, the exhaust duct 72, the intake duct 74, the control board including the control unit 90, and the power supply board 97 are arranged on the internal substrate 16 inside the housing 10.

[0015] As shown in Figures 1(c) and 8, an air intake port 15 is provided penetrating the bottom plate 12. As shown in Figure 5, an air intake duct 74 is provided in the lower part of the housing 10 above the air intake port 15. The air intake duct 74 penetrates the rear panel 63 at the rear (X2 side) and is connected to an air intake duct cover 75 (Figure 3) provided on the rear panel 63. With this configuration, outside air can be introduced from the bottom of the housing 10 through the air intake port 15, and from the rear of the housing 10 through the air intake duct cover 75 and the air intake duct 74.

[0016] 5 and 8, exhaust fan 71 is disposed at the top of housing 10, and is connected to exhaust duct 72 extending in the left-right direction (Y1-Y2 direction). Exhaust duct 72 penetrates rear panel 63 at the rear (X2 side) and is connected to exhaust duct cover 73 provided on rear panel 63. In the above configuration, when exhaust fan 71 is operated, outside air is drawn into housing 10 through intake port 15 and intake duct 74, flows from bottom to top within housing 10 as shown in FIG. 8, and is discharged to the outside through exhaust duct 72.

[0017] Here, because the air intake 15 is provided on the bottom plate 12 below the liquid crystal display unit 62, the outside air introduced from the air intake 15 flows mainly through the spaces in front and behind the liquid crystal display unit 62 toward the exhaust fan 71, thereby cooling the liquid crystal display unit 62. In contrast, the outside air introduced from the air intake duct 74 flows mainly toward the exhaust fan 71 in the space behind the liquid crystal display unit 62 within the housing 10, thereby cooling components whose temperatures are likely to rise, such as the control unit 90 and power supply board 96.

[0018] 4, a liquid crystal display unit 62 serving as a display unit is disposed in a portion adjacent in the front-to-rear direction (X1-X2 direction) to the central region 61a of the face plate 61. The liquid crystal display unit 62 has a screen configuration in which pixels are arranged in a matrix, and displays a predetermined image under the control of the control unit 90 (see FIG. 7). The display section is not limited to a liquid crystal display section, and organic EL elements, LEDs arranged in a matrix, etc. may also be used.

[0019] A decorative portion 20 is arranged adjacent in the front-to-rear direction (X1-X2 direction) to a rectangular light-emitting region 61b that surrounds a central region 61a of the face plate 61. The decorative portion 20 includes six light-guiding members 21, 22, 23, 24, 25, and 26 that are arranged along the rectangular frame shape of the light-emitting region 61b, and four LEDs 31, 32, 33, and 34 that serve as light-emitting elements.

[0020] The four LEDs 31, 32, 33, and 34 are elements capable of emitting light in three primary colors and are arranged on the rear side of the faceplate 61 at positions corresponding to four corners 61c of the light-emitting area 61b. As shown in Fig. 11, the light-emitting surfaces 31a, 32a, 33a, and 34a of the four LEDs 31, 32, 33, and 34 are arranged so that they face inward of the rectangular frame shape of the light-emitting area 61b when viewed in the front-to-rear direction (X1-X2 direction). Furthermore, at the corners 61c (see Fig. 4) where they are arranged, the planar light-emitting surfaces form a predetermined angle of 45 degrees with respect to both directions in which two perpendicular sides of the rectangular frame shape extend (Z1-Z2 direction and Y1-Y2 direction). Specifically, when viewed from the front, light-emitting surface 31a located at the lower left faces toward the upper right, light-emitting surface 32a located at the upper left faces toward the lower right, light-emitting surface 33a located at the upper right faces toward the lower left, and light-emitting surface 34a located at the lower right faces toward the upper left. Furthermore, each light-emitting surface forms an angle of 90 degrees with respect to a plane that includes both of the directions in which the two sides of the rectangular frame shape of light-emitting area 61b extend.

[0021] As shown in FIG. 6 , the first LED 31 is supported by a metal support member 31b, which extends to the internal substrate 16. With this configuration, heat generated by the LED 31 is transferred to the internal substrate 16 through the support member 31b. The other three LEDs 32, 33, and 34 are also supported by similar support members, and heat generated by each LED is transferred to the internal substrate 16. As described above, the exhaust duct 72 circulates outside air within the housing 10 and is released to the outside through the exhaust duct cover 73 provided on the back panel 63. This effectively cools the heat transferred from the LEDs 31, 32, 33, and 34 through their respective support members. This cooling structure allows the four LEDs 31, 32, 33, and 34 to be positioned closer to the light-guiding members 21, 22, 23, 24, 25, and 26, thereby expanding the central region 61a and narrowing the light-emitting region 61b.

[0022] The light guide members 21, 22, 23, 24, 25, and 26 are each rod-shaped and formed by molding acrylic or other synthetic resin so that both ends in the extension direction thereof serve as incident surfaces and the side surfaces serve as output surfaces. As will be described later, only one end surface may be made the incident surface. In this case, it is preferable to process the other end surface during or after molding so that it is non-transparent or has low light transmittance.

[0023] The light guide members 21, 22, 23, 24, 25, and 26 have the same cross-sectional shape perpendicular to the extension direction, and are arranged within the housing 10 along four sides of the rectangular liquid crystal display unit 62 when viewed from the front, in a space sandwiched between the liquid crystal display unit 62, the left side panel 11, the bottom panel 12, the right side panel 13, and the top panel 14. Specifically, the first light guide member 21 is arranged along the bottom panel 12, the second light guide member 22 and the third light guide member 23 are arranged along the left side panel 11 at a predetermined interval as an isolated region without light guide members, the fourth light guide member 24 is arranged along the top panel 14, and the fifth light guide member 25 and the sixth light guide member 26 are arranged along the right side panel 13 at a predetermined interval as an isolated region without light guide members. As a result, the light guide members 21, 22, 23, 24, 25, and 26 are arranged in a rectangular frame shape corresponding to the light-emitting region 61b. In this embodiment, the light guide members 21, 22, 23, 24, 25, and 26 have a rectangular prism shape, but other shapes, such as a cylindrical, triangular prism, or polygonal prism, can also be used as long as they are rod-shaped overall.

[0024] As shown in Fig. 5 or 9, the first light guide member 21 is disposed so as to extend in the left-right direction (Y1-Y2 direction) along the bottom plate 12, and is fixed to a first stay 51 provided at a position corresponding to the first light guide member 21 with respect to the housing 10. The first stay 51 is a metal support member extending in the left-right direction, and its cross section perpendicular to the extension direction has a U-shape with the front side (X1 side) open. Here, Fig. 9(a) shows the state before the first light guide member 21 is inserted into the first stay 51, 9(b), the first light guide member 21 is inserted from the front and fixed using a light guide member intermediate fixing metal fitting 51a and heat-resistant double-sided tape (not shown), thereby restricting forward movement. Also, as shown in FIG. 9(b), the light guide member 22 is fixed to the second stay 52 using a light guide member end fixing metal fitting 52a and heat-resistant double-sided tape (not shown).

[0025] The first light guide member 21 is fixed to the first stay 51 with a fixing agent, such as heat-resistant double-sided tape (not shown), placed between the first stay 51 and the inner surface of the first stay 51, and the light guide member intermediate fixing metal fittings 51a restrict forward movement of the first stay 51. If the temperature inside the display unit 100 increases due to an increase in the outside temperature of the display unit 100 or exposure to direct sunlight, the first light guide member 21 will expand accordingly, and therefore the restriction by the light guide member intermediate fixing metal fittings 51a and the strength of the fixing by the double-sided tape are set according to the expected degree of expansion.

[0026] By constructing the first stay 51 from a metal material with a predetermined reflectivity as a reflector, or by applying a reflective coating to the inner surface, the light emitted from the side of the first light-guiding member 21 can be reflected and emitted to the front, thereby achieving efficient light emission as a decorative part 20.

[0027] The second light guide member 22 is disposed to extend in the vertical direction (Z1-Z2 direction) along the left side panel 11 and is fixed to a second stay 52 provided at a position corresponding to the second light guide member 22 with respect to the housing 10. As shown in FIG. 5 , the range over which the second light guide member 22 extends is from near the center in the vertical direction downward with respect to the left side panel 11. The third light guide member 23 extends upward from near the center in the vertical direction with respect to the left side panel 11 at a fixed distance from the second light guide member 22. The third light guide member 23 is fixed to a third stay 53 provided at a position corresponding to the third light guide member 23 with respect to the housing 10.

[0028] As shown in FIGS. 5 and 9 , the second stay 52 and the third stay 53 are metal support members similar to the first stay 51, and are fixed to the housing 10 so as to extend vertically. The cross sections of the second stay 52 and the third stay 53 perpendicular to the extension direction are U-shaped with the front side (X1 side) open. Here, FIG. 9( a) shows the state before the second light guide member 22 is inserted into the second stay 52, while FIG. 9( b) shows the second light guide member 22 inserted from the front side, similar to the first light guide member 21. The light guide member end fixing metal fittings 52a restrict forward movement of the second light guide member 22, and the second light guide member 22 is fixed to the second stay 52 using heat-resistant double-sided tape (not shown). Although not shown in FIGS. 9( a) and 9(b), the configuration in which the light guide member end fixing metal fittings 53a restrict movement of the third light guide member 23 to the third stay 53 is similar to the configuration in which the light guide member end fixing metal fittings 52a of the second stay 52 are used.

[0029] Similarly to the first stay 51, the second stay 52 and the third stay 53 also have a structure that allows them to function as reflectors.

[0030] 5, the fourth light guide member 24 is disposed so as to extend in the left-right direction (Y1-Y2 direction) along the top panel 14, and is fixed to a fourth stay 54 provided at a position corresponding to the fourth light guide member 24 with respect to the housing 10. The fourth stay 54 is a metal support member similar to the first stay 51, and has a similar configuration. The method for fixing the fourth light guide member 24 to the fourth stay 54 is similar to the method for fixing the first light guide member 21 to the first stay 51. Furthermore, like the first stay 51, the fourth stay 54 also has a configuration for functioning as a reflector.

[0031] The fifth light guide member 25 is disposed to extend in the up-down direction (Z1-Z2 direction) along the right side panel 13, and is fixed to a fifth stay 55 that is fixed to the housing 10 at a position corresponding to the fifth light guide member 25. The range over which the fifth light guide member 25 extends is from near the center in the up-down direction to the upper side with respect to the right side panel 13. The sixth light guide member 26 extends from near the center in the up-down direction to the lower side with respect to the right side panel 13 at a certain distance from the fifth light guide member 25. The sixth light guide member 26 is fixed to a sixth stay 56 that is provided at a position corresponding to the sixth light guide member 26 with respect to the housing 10.

[0032] The fifth stay 55 and the sixth stay 56 are metal support members similar to the second stay 52 and the third stay 53, have the same configuration, and extend in the vertical direction. The method of fixing the fifth light guide member 25 to the fifth stay 55 and the method of fixing the sixth light guide member 26 to the sixth stay 56 are similar to the methods of fixing the second light guide member 22 to the second stay 52 and the third light guide member 23 to the third stay 53. Furthermore, like the first stay 51, the fifth stay 55 and the sixth stay 56 also have a configuration that allows them to function as reflectors.

[0033] As described above, each of the rod-shaped light guide members 21, 22, 23, 24, 25, and 26 has both ends in the extension direction as incident surfaces and side surfaces as exit surfaces. Specifically, as shown in Fig. 11, the left end surface of the first light guide member 21 in the left-right direction (Y1-Y2 direction) is the first incident surface 21a, the right end surface is the second incident surface 21c, and the side surface 21b between these left and right end surfaces is the exit surface. The fourth light guide member 24 extending parallel to the first light guide member 21 also has the left end surface in the left-right direction as the first incident surface 24a, the right end as the second incident surface 24c, and the side surface 24b between these left and right end surfaces is the exit surface.

[0034] The third light guiding member 23 has an upper end face in the vertical direction (Z1-Z2 direction) as a first incident surface 23a, and a side surface 23b between the upper and lower end faces as an exit surface. The second light guiding member 22 located below the third light guiding member 23 has a lower end face in the vertical direction as a first incident surface 22a, and a side surface 22b between the upper and lower end faces as an exit surface.

[0035] The fifth light guide member 25 is disposed parallel to the third light guide member 23, and its upper end surface in the vertical direction (Z1-Z2 direction) serves as a first incident surface 25a, and its side surface 25b between the upper and lower end surfaces serves as an exit surface. The sixth light guide member 26 is disposed below the fifth light guide member 25, and its lower end surface in the vertical direction serves as a first incident surface 26a, and its side surface 26b between the upper and lower end surfaces serves as an exit surface.

[0036] As shown in FIG. 4, four LEDs 31, 32, 33, and 34 shown in FIG. 5 are disposed at positions corresponding to the four corners 61c, respectively. Also, as shown in FIG. 11, the incident surfaces of two light-guiding members extending in mutually orthogonal directions are disposed. The incident surface of one of the two light-guiding members is notched at an angle parallel to the light-emitting surface of the corresponding LED, and the two light-guiding members are disposed parallel to each other with a predetermined distance from the light-emitting surface. The incident surface of the other light-guiding member is disposed so as to contact the side surface of the first light-guiding member. The angle at which the incident surface is notched is 45 degrees, matching the angle of the light-emitting surface of the LED, and is also an angle relative to the extension direction of the light-guiding member. The angle of the incident surface of the light-guiding member facing the LED can be formed by cutting or milling the incident surface perpendicular to the extension direction to the desired angle. Alternatively, for example, when forming the light-guiding member by molding, a molding die corresponding to the desired angle can be used.

[0037] 10(a), at the corner 61c where the first LED 31 is disposed, the incident surface 21a of the first light guide member 21 extending in the left-right direction (Y1-Y2 direction) is notched at an angle of 45 degrees and is disposed at a distance D1 from the light-emitting surface 31a. In contrast, the incident surface 22a of the second light guide member 22 extending in the up-down direction (Z1-Z2 direction) is notched, and its entire surface is in contact with the side surface 21b at the left end of the first light guide member 21.

[0038] 11, the distance D1 is set to be the same for the light-emitting surfaces 31a, 32a, 33a, and 34a of the four LEDs 31, 32, 33, and 34 and the light-guiding members facing them, respectively, and is set appropriately depending on conditions such as the lengths of the light-guiding members 21, 22, 23, 24, 25, and 26 and the luminance of the four LEDs 31, 32, 33, and 34. For example, if the lengths of the first light-guiding member 21 and the fourth light-guiding member 24 are 436 mm, the lengths of the second light-guiding member 22, the third light-guiding member 23, the fifth light-guiding member 25, and the sixth light-guiding member 26 are 360 ​​mm, and the luminance of the four LEDs 31, 32, 33, and 34 is 20 cd / m2, the distance D1 is set to 2.5 mm.

[0039] Here, the incident surface 22a of the second light guide member 22 may be disposed at a position shifted to the right of the left end of the first light guide member 21, as long as the entire surface of the incident surface 22a is in contact with the side surface 21b of the first light guide member 21. The same applies to the incident surface 23a of the third light guide member 23, the incident surface 25a of the fifth light guide member 25, and the incident surface 26a of the sixth light guide member 26.

[0040] 10(b), the incident surface 22a of the second light guide member 22 may be cut out at a 45-degree angle so as to be parallel to the light-emitting surface 31a and face the light-emitting surface 31a, while the incident surface 21a of the first light guide member 21 may not be cut out and may be in full contact with the side surface 22b of the second light guide member 22. In this case, the incident surface 23a of the third light guide member 23, the incident surface 25a of the fifth light guide member 25, and the incident surface 26a of the sixth light guide member 26 may also be made to face the light-emitting surfaces of the corresponding LEDs.

[0041] In this embodiment, the upper and lower sides of the rectangular frame shape of the light-emitting region 61b are respectively constituted by the first light-guiding member 21 and the fourth light-guiding member 24, while the left side is constituted by two light-guiding members 22 and 23 arranged vertically at a distance from each other, and the right side is constituted by two light-guiding members 25 and 26 arranged vertically at a distance from each other. Additionally or instead of this, each of the upper and lower sides may be constituted by two light-guiding members arranged horizontally at a distance from each other.

[0042] The angle (predetermined angle) between the light-emitting surfaces 31a, 32a, 33a, and 34a of the four LEDs 31, 32, 33, and 34 and the cutout angle of one of the incident surfaces of the two light-guiding members disposed at the corresponding corners 61c are not limited to 45 degrees. The angle may be any angle other than 45 degrees as long as the light-emitting surfaces and the incident surfaces are parallel to each other at the corners 61c. The range of these angles is preferably 23 degrees to 67 degrees. In this angle range, for example, in the configuration shown in FIG. 10(a), light incident through the incident surface 21a parallel to the light-emitting surface 31a travels in the extension direction (Y1-Y2 direction) of the first light-guiding member 21 having the incident surface 21a. Furthermore, the amount of light entering the second light-guiding member 22 from the incident surface 22a in contact with the side surface 21b of the first light-guiding member 21 increases. Furthermore, when the angle ranges from 40 degrees to 50 degrees, approximately half of the traveling direction of the incident light from the incident surface 21a of the first light guide member 21 heads toward the incident surface 22a of the second light guide member 22, thereby ensuring a sufficient amount of light entering the second light guide member 22 from the incident surface 22a. Similarly, each light-emitting surface may be at an angle other than 90 degrees with respect to a plane that includes both directions in which two sides of the rectangular frame shape of the light-emitting region 16b extend.

[0043] A pattern that changes light transmittance may be formed on the light-emitting region 61b or on a surface or area that is mainly in the front of the light-guiding member in order to adjust the balance of light emission intensity in the light-emitting region 61b, set the light-emitting range, add design features to the light emission, etc. The pattern is formed by, for example, silkscreen printing, and the non-transparent pattern is formed so that it gradually decreases or increases along the extension direction of the light-guiding member.

[0044] In the second light guide member 22 and the third light guide member 23, which are arranged with a predetermined interval (separation region) between them, the opposing end faces 22c, 23c are coated with a non-transparent coating or roughened so as not to function as incident or emitting surfaces. This is preferable because it prevents light from being emitted toward adjacent light guide members or prevents unexpected light from entering from the outside, making them less susceptible to disturbance light, allowing light to be emitted in a desired state. Similarly, the fifth light guide member 25 and the sixth light guide member 26 can also have a similar effect by coating or otherwise preventing light from entering their opposing end faces 25c, 26c at a distance from each other.

[0045] It is also possible to use light-guiding members with different light-guiding performance for the light-guiding members arranged to extend in the vertical direction and the light-guiding members arranged to extend in the horizontal direction. This allows the light-emitting intensity of the light-guiding members extending in the vertical direction and the light-guiding members extending in the horizontal direction to be the same or to have a desired intensity ratio. Furthermore, the same effect can be achieved by changing the light-guiding performance of the light-guiding member whose incident surface faces the LED and the light-guiding member into which the light emitted from the exit surface, which is the side surface of the light-guiding member, is incident.

[0046] With the above configuration, in the display device 100 having the liquid crystal display unit 62 that can display images and videos that are easy to see whether the display device is installed indoors or outdoors, the width of the light-emitting area 61b (frame-shaped area) around the liquid crystal display unit 62 can be narrowed, allowing the liquid crystal display unit 62 to be arranged over a wider area, and the light-guiding members 21, 22, 23, 24, 25, 26 and the four LEDs 31, 32, 33, 34 as light-emitting elements can be efficiently arranged so that the light-guiding members 21, 22, 23, 24, 25, 26 can emit light over a wider range of the light-emitting area 61b as the frame-shaped area around the liquid crystal display unit 62, thereby further enhancing the attraction effect on viewers.

[0047] As shown in Fig. 5, a pair of speakers 41, 42 are provided symmetrically at the same position in the vertical direction (Z1-Z2 direction). As shown in Fig. 12, sound emission holes 41a, 42a of speakers 41, 42 are respectively arranged so as to communicate with two holes penetrating rear panel 63, and sound is emitted rearward from these sound emission holes 41a, 42a.

[0048] As shown in Figures 12 and 14, the pair of sound emission holes 41a and 42a are covered by a pair of sound emission hole covers 41b and 42b, respectively, and the pair of sound emission hole covers 41b and 42b are covered by a pair of guide covers 41c and 42c, respectively.

[0049] As shown in FIG. 13(a), the first sound emission hole cover 41b has a hollow shape with an opening on the front side and a flange surface 41b1 that is fixed to the rear panel 63 with screws or the like. A corner of the flange surface 41b1 that is on the lower side (Z2 side) and left side (Y1 side) when the first sound emission hole cover 41b is placed on the rear panel 63 is cut out, including the side surface, to form a first cutout portion 41d that is an opening. Because the first sound emission hole cover 41b is tightly fixed to the rear panel 63, the portions other than the first cutout portion 41d have a tight fit that prevents water from entering. The second sound emission hole cover 42b also has the same shape as the first sound emission hole cover 41b, and when tightly fixed to the rear panel 63, a second cutout portion (not shown) similar to the first cutout portion 41d is located on the lower side (Z2 side) and left side (Y1 side). In other words, the first sound emission hole cover 41b and the second sound emission hole cover 42b are arranged so that when fixed onto the back panel 63, the first cutout portion 41d and the second cutout portion open in the same direction.

[0050] As shown in FIG. 13(a), the first guide cover 41c has a hollow shape with an opening at the front and a shape that is bent forward halfway along its extension in the left-right direction (Y1-Y2 direction). The left (Y1-side) end of the guide cover 41c forms a leading end opening 41e that opens in the extension direction. The bent shape of the guide cover 41c conforms to the outer surface shape of the rear panel 63 from the rear to the left side surface 11 (see FIGS. 2(a) and 3). As shown in FIG. 13(b), the guide cover 41c is fixed to the rear panel 63 in a state in which the first sound emission hole cover 41b fixed to the rear panel 63 is positioned so as to accommodate the first sound emission hole cover 41b in the internal space. With this positioning, the leading end opening 41e is positioned outside the left side panel 11 and faces forward (see FIG. 1(b)). The guide cover 41c is tightly fixed to prevent air from entering or leaving the outside, except for the leading end opening 41e. With the guide cover 41c fixed in this manner, the sound emitted from the first sound emission hole 41a of the first speaker 41 travels through the first cutout portion 41d of the first sound emission hole cover 41b into the guide cover 41c and is emitted forward from the tip opening 41e (Figures 13(b) and 14).

[0051] The second guide cover 42c has a symmetrical shape to the first guide cover 41c, a hollow shape with an opening at the front, and a shape that is bent forward halfway along its extension in the left-right direction (Y1-Y2 direction). The second guide cover 42c has a tip opening 42e on the right side (Y2 side) that opens in the extension direction. The bent shape of the second guide cover 42c follows the outer surface shape of the back panel 63 from the back to the right side surface 13 (see FIG. 2(b)). Similar to the first guide cover 41c, the second guide cover 42c is fixed to the back panel 63 in a state in which the second sound emission hole cover 42b fixed to the back panel 63 is positioned so as to accommodate the second sound emission hole cover 42b in the internal space. With this positioning, the tip opening 42e is positioned outward from the right side panel 13 and faces forward. The second guide cover 42c is tightly fixed to prevent air from entering or leaving the outside, except for the tip opening 42e. When the second guide cover 42c is fixed in this manner, the sound emitted from the second sound emission hole 42a of the second speaker 42 travels through the second cutout portion (not shown) of the second sound emission hole cover 42b, into the second guide cover 42c, and is emitted forward from the tip opening 42e (Figure 14).

[0052] As shown in Fig. 3, the first guide cover 41c and the second guide cover 42c are disposed at the same position in the up-down direction (Z1-Z2 direction) and are disposed so as to be spaced apart from each other in the left-right direction. Therefore, as shown in Fig. 1(b), the first tip opening 41e and the second tip opening 42e are disposed so as to face forward at symmetrical positions on the outside of the left side panel 11 and the outside of the right side panel 13. Therefore, sounds generated by the first speaker 41 and the second speaker 42 are emitted forward in a balanced manner from the left and right directions.

[0053] 1(b), when the display device 100 is placed vertically, the first speaker 41 and the second speaker 42 are arranged horizontally, and the sound generated by both speakers is emitted forward in a balanced manner from the left and right. In the vertical position, the cutouts 41d and 42b of the sound output hole covers 41b and 42b (the cutout of the second sound output hole cover 42b is not shown) are located at the lower left and are covered by the guide covers 41c and 42c that are tightly fixed to the back panel 63, making it difficult for moisture such as rain and dew to penetrate.

[0054] In contrast, the display device 100 shown in FIG. 1(b) can also be used in a horizontal position as shown in FIG. 15. In the horizontal position, the first speaker 41 and the second speaker 42 are aligned vertically. In this case, the cutouts 41d and 42b of the sound hole covers 41b and 42b (the cutout of the second sound hole cover 42b is not shown) are both located at the bottom right, which makes it difficult for moisture such as rain and dew to penetrate. In addition, the tip opening 41e of the guide cover 41c faces downward, further reducing the penetration of moisture such as rain and dew. The tip opening 42e of the guide cover 42c faces upward, but even if rain or dew does penetrate, a small hole (not shown) is provided at the bottom surface of the guide cover 42c that allows water to drain and minimizes sound leakage, making it difficult for moisture such as rain and dew to penetrate into the interior of the display device 100.

[0055] 7, the display device 100 further includes a control unit 90, an input device 92, a storage device 93, a temperature sensor 94, and an illuminance sensor 95. The control unit 90 includes an internal storage device 91a, a fan controller 91b, a liquid crystal controller 91c, and an LED controller 91d. Some or all of these may be provided inside the housing 10, or they may be provided externally and send and receive signals to and from circuits and the like provided inside the housing 10 via wireless or wired connections.

[0056] The operation of the liquid crystal display unit 62 is controlled by a liquid crystal controller 91c provided in the control unit 90. The liquid crystal controller 91c generates a control signal based on an instruction signal input from the input device 92 and provides it to the liquid crystal display unit 62. It is also possible to store instruction signals and signals related to screen display input from the input device 92 in advance in the storage device 93, and provide a control signal based on this signal to the liquid crystal controller 91c to generate a control signal.

[0057] The operation of the four LEDs 31, 32, 33, and 34 is controlled by an LED controller 91d included in the control unit 90. The LED controller 91d generates control signals based on instruction signals input from the input device 92 and provides them to each LED. Alternatively, instruction signals and screen display-related signals input from the input device 92 can be stored in advance in the storage device 93, and control signals based on these signals can be provided to the LED controller 91d to generate control signals. The LED controller 91d can control the four LEDs 31, 32, 33, and 34 to emit light of the same color and intensity, or to emit different colors or flash. Furthermore, by emitting light of any color on each side of the light-emitting area 61b or by varying the timing of light emission on each side, it is possible to create a display that appears to emit light in a rotating manner on all four sides, thereby enhancing the effect of attracting the viewer's attention.

[0058] The control unit 90 operates using power supplied from the power supply board 97, and generates drive signals for the LCD display unit 62 and the four LEDs 31, 32, 33, and 34 based on signals provided from the input device 92 and detection signals from the temperature sensor 94 and the illuminance sensor 95, and generates control signals to be provided to the fan controller 91b.

[0059] The fan controller 91b built into the control unit 90 controls the on / off operation of the exhaust fan 71. Specifically, the display device 100 is equipped with a temperature sensor 94 and an illuminance sensor 95, and the results of detection by these sensors are compared with thresholds pre-stored in the fan controller 91b to automatically drive or stop the fan. For example, when the temperature or illuminance is low, the drive current can be reduced by driving the fan intermittently or stopping it. Furthermore, by changing the drive conditions of the exhaust fan 71 based on the changes over time in the detection results of the temperature sensor 94 and the illuminance sensor 95, the drive current can be reduced while ensuring the desired cooling performance under optimal conditions.

[0060] 5, the temperature sensor 94 is provided on the internal substrate 16, below the exhaust fan 71 and above the control unit 90 and power supply substrate 97. Any number of temperature sensors can be provided at any position within the display device 100, but it is preferable to provide them near heat-generating components such as the four LEDs 31, 32, 33, and 34, the LCD display unit 62, the control unit 90, and the power supply substrate 97. Furthermore, if a temperature sensor is provided on the outside of the display device 100, the temperatures inside and outside the display device 100 can be detected.

[0061] The illuminance sensor 95 is provided on the internal substrate 16 and detects external light entering through an intake hole 95a (see FIG. 1(b)) provided on the underside of the face plate 61. The illuminance sensor can be provided at any position on the display device 100 as long as it can take in external light. Furthermore, the installation of the illuminance sensor 95 may be omitted, and the drive of the exhaust fan 71 may be controlled based on the detection result of the temperature sensor 94.

[0062] The driving conditions of the exhaust fan 71 can be changed by using the input device 92 to send a control signal from the fan controller 91b to the storage device 93, thereby overwriting the corresponding data stored in the storage device 93. In addition, it is also possible to determine a threshold value in advance taking into consideration the driving time period and driving time interval, and change the driving conditions depending on the season, weather, installation environment, operating temperature of the liquid crystal display unit 62, orientation of the display device 100 relative to sunlight, etc.

[0063] (Example) As an example, as shown in Figures 1(b), 3, etc., the volume of sound emitted from the two speakers 41, 42 was measured on a display device 100 that was installed with left and right guide covers 41c, 42c and placed vertically.

[0064] As a comparative example, in a configuration in which the guide covers 41c and 42c were not provided and two sound emission hole covers 41b and 42b were provided on the two sound emission holes 41a and 42a, respectively, the volume of sound emitted from the two speakers 41 and 42 was measured.

[0065] The sound level meter was placed 1.5 m away from the front panel 61, left panel 11, back panel 63, or right panel 13, facing the display unit 100, and the sound level was measured under the following conditions. (1) Sound level meter: CEM, model number DT-85A (2) Sound generation: A sample sound source with a frequency of 400 Hz, which is close to the international standard sound (440 Hz), was prepared and emitted from speakers 41 and 42.

[0066] As shown in Table 1, the example in which guide covers 41c and 42c were provided had a louder sound volume detected in the front (X1 side) than the comparative example in which guide covers 41c and 42c were not provided, demonstrating the effect of arranging tip openings 41e and 42e facing forward. Also, the sound volumes detected on the left and right sides were almost the same, confirming the effect of arranging tip openings 41e and 42e symmetrically.

[0067] [Table 1]

[0068] With this configuration, even when installed outdoors, the waterproofing of the two speakers 41, 42 can be ensured, and a display device 100 can be realized that can easily transmit well-balanced sound to viewers in front. Although the present invention has been described with reference to the above-described embodiment, the present invention is not limited to the above-described embodiment, and improvements or modifications are possible within the scope of the purpose of improvement or the concept of the present invention. [Explanation of symbols]

[0069] 10. Cabinet 11 Left side plate (1st side plate) 12 Bottom plate (second side plate) 13 Right side plate (3rd side plate) 14 Top plate (fourth side plate) 15 Air intake 16 Internal board 20 Decorative Section 21 First light guide member 21a, 21c entrance plane 21b Output surface 22 Second light guide member 22a Incidence plane 22b Output surface 22c end face 23 Third light guide member 23a Incidence plane 23b Output surface 23c end face 24 Fourth light-guiding member 24a, 24c entrance plane 24b Output surface 25 Fifth light-guiding member 25a Incidence plane 25b Output surface 25c end face 26 Sixth light-guiding member 26a Incidence plane 26b Output surface 26c end face 31 1st LED 31a First light-emitting surface 31b Support member 32 Second LED 32a Second light-emitting surface 33 3rd LED 33a Third light-emitting surface 34 4th LED 34a Fourth light-emitting surface 41 1st Speaker 41a 1st sound emission hole 41b 1st sound emission hole cover 41c First guide cover 41d Notch 41e Tip opening 42 Second Speaker 42a 2nd sound emission hole 42b 2nd sound emission hole cover 42c 2nd guide cover 42d Notch 42e Tip opening 51 First Stage 51a Light guide member intermediate fixing metal fitting 52 Second Stay 52a Light guide member end fixing metal fitting 53 Third Stage 53a Light guide member end fixing metal fitting 54 4th Stage 54a Light guide member intermediate fixing bracket 61 Surface plate 61a central area 61b Light-emitting area 61c Corner 62 Liquid crystal display section (display section) 63 Back plate 71 Exhaust fan 72 Exhaust duct 73 Exhaust duct cover 74 Intake duct 75 Intake duct cover 90 Control Unit 91a Internal storage device 91b Fan Controller 91c LCD controller 91d LED Controller 92 Input Devices 93 Storage device 94 Temperature Sensor 95 Illuminance sensor 95a Intake hole 97 Power supply board 100 display 102 Front opening 120 Side cover

Claims

1. The housing and a rectangular surface plate covering the front surface of the housing; a rectangular back plate facing the front plate and covering the back surface of the housing; a display unit that displays a video or image in a central region of the faceplate; a pair of speakers capable of emitting sound to the outside from each sound emission hole; a decorative portion arranged along the rectangular frame shape to illuminate a rectangular frame-shaped light-emitting area around the central area on the front panel, the housing includes four side panels extending from four sides of the rear panel to four sides of the front panel, respectively; The four side panels extend along a first direction or a second direction perpendicular to the first direction, the pair of speakers have a pair of the sound emission holes respectively disposed at two positions symmetrical to each other in the first direction or the second direction on the rear panel, The pair of sound emission holes are covered by a pair of sound emission hole covers, each of which has a pair of cutout portions that allow sound to be emitted to the outside, At least one of the pair of sound emission hole covers is covered by a guide cover having a sound emission opening at a tip end thereof, the guide cover extends outward from the rear panel in a direction in which the pair of sound emission holes are arranged, and is guided along the outer surface of the side panel at the end of its extension, and is arranged so that each of the sound emission openings faces forward, The decorative part is a plurality of light guide members each extending in a rod shape, having the same cross-sectional shape perpendicular to the extending direction, and arranged along the rectangular frame shape of the light emitting region; Four light-emitting elements arranged at four corners of the light-emitting area, respectively; Equipped with Each of the plurality of light guide members is configured so that light enters from an incident surface serving as at least one end surface in the extension direction thereof, and light exits from a side surface serving as an exit surface thereof, the four light-emitting elements are arranged to face inward of the rectangular frame shape, and the light-emitting surfaces, which are flat, form a predetermined angle with respect to the four corresponding corners and with respect to both directions in which two sides of the rectangular frame shape that are orthogonal to each other extend; at the four corners, one of the two light-guiding members extending in directions perpendicular to each other is arranged such that an incident surface, which is cut out at an angle corresponding to the predetermined angle with respect to the extension direction of the light-guiding member, faces parallel to each other at a predetermined interval with respect to the light-emitting surface, and the other of the two light-guiding members is arranged such that the entire incident surface perpendicular to the extension direction of the light-guiding member is in contact with a side surface of the one of the light-guiding members, and the predetermined angle is an angle within a range in which light can be incident from the side surface of the one of the light-guiding members to the other of the two light-guiding members, the plurality of light guide members are arranged such that, on at least two opposing sides of the four sides of the rectangular frame shape of the decorative part, an isolated region in which no light guide members are arranged is formed midway along the extension direction of the sides, and The light guide member extends along one side of the light emitting region without sandwiching the isolation region, and both end faces of the light guide member serve as the light incident surface.

2. the display is configured such that the pair of speakers are arranged along a horizontal direction; The display device according to claim 1 , wherein the pair of sound emission hole covers are covered by the pair of guide covers, respectively.

3. 3. The display device according to claim 2, wherein the pair of sound emission hole covers have the same shape, and when fixed to the back panel, the pair of notches open in the same direction.

Images