JP2582865Y2 - display - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display which is provided in a control device or an information guide device and displays various variable information.

[0002]

2. Description of the Related Art Hitherto, various types of displays have been known. For example, the display shown in FIG. 5 includes a circuit board 61 on which a plurality of light emitting elements 62 are mounted, and a transparent resin case body 63 adhered and provided on the upper surface of the circuit board 61.
A plurality of through holes (accommodation vacancies) 64 corresponding to the light emitting elements 62 for one dot are formed in the transparent resin case body 63. In each of the through holes 64, the light emitting elements 62 forming a pair of a red light emitting element 62a and a green light emitting element 62b are fitted and individually accommodated. A transparent film sheet 65 that covers the upper opening surface of each through-hole 62a is attached to the upper surface of the transparent resin case body 62. FIG.
The display indicated by is a circuit board 71 on which a plurality of light emitting elements 72 are mounted, and an upper surface of the circuit board 71, that is, a surface including a plurality of light emitting elements 72 forming a pair of a red light emitting element 72a and a green light emitting element 72b. And a transparent resin coating layer 73 integrally coated. Each of the above-mentioned displays displays various information by blinking the light-emitting element by a signal of the circuit board.

[0003]

In each of the above conventional displays, the light emitting element is covered with a cover (transparent resin film layer) made of a transparent resin. For this reason, the shape of the light-emitting element itself, the pattern of the circuit board,
The appearance is unfavorable as a display. Further, in a color display in which a plurality of light-emitting elements having different emission colors are the same display dot, for example, when it is necessary to light up a red light-emitting element and a green light-emitting element at the same time and display with a composite color orange light, a conventional method is used. In a structure in which a light-emitting element is simply surrounded by a transparent cover, the red and green light-emitting points (light source points) are directly visible. That is, in addition to the orange light, red and green light source points can be seen in the details, and the orange light, which is the original luminescent color, is incomplete, and there is a disadvantage that the display feeling as a whole deteriorates. Furthermore, in recent years, there has been a demand for a small and accurate display having a large number of dots with the same area. By the way, with the current light emitting diode mounting technology, it is easy to mount small light emitting elements densely. However, the conventional transparent resin cover shown in FIG. 5 has a configuration in which a large number of through-holes are formed in the plane, and therefore, there is a limit in the dot density due to the resin molding technology, and it is not possible to realize a desirable miniaturization. On the other hand, the method of forming a transparent resin coating layer shown in FIG. 6 does not cause a problem of difficulty in miniaturization because the resin is simply applied, but the coating layer is transparent, There is a disadvantage that the light emission between the dense light-emitting elements interferes with each other, not only because of the appearance of the dots and the inability to obtain perfect mixed color light.

This invention solves the above-mentioned problems, and makes it difficult for the shape of the light-emitting element or the like to have an external appearance, to obtain a clear light emission display of a completely combined color, and to achieve a high dot density and a compact size. The purpose is to provide.

[0005]

In order to achieve this object, the display of the present invention has the following configuration. The display includes a circuit board on which a plurality of light emitting elements are mounted, and a light-transmitting cover disposed on the upper surface of the circuit board. Are provided, and the surface of each of the concave portions is a rough surface for unevenness for light diffusion.

In the display having such a structure, a large number of concave portions are formed in the surface of the transparent resin cover body, and the concave portions are formed with a rough surface. Light emitting elements for one dot (for example, two light emitting elements for red and green) are accommodated in each of the concave portions. Therefore, the form of the light emitting element or the like surrounded by the concave portion of the rough surface cannot be visually observed accurately. Also, the lighting light of each light emitting element is directly
The light is not transmitted through the transparent cover but diffused on the rough surface of the concave portion and emitted to the outside of the transparent cover. Therefore, the light source point at which the light emitting element is turned on cannot be seen, and when the two light emitting elements are turned on at the same time, a completely mixed color light of red and green (orange light) is obtained, and the overall display feeling is excellent. In addition, since the surface has a structure in which the light emitting element is surrounded by the concave portion of the rough surface, the display directivity angle is wide and the display can be seen well from the lateral direction, and the directivity of the display is improved. Furthermore, since a plurality of recesses are formed on the inner surface of the transparent resin plate, resin molding is easier, dot density can be increased, and a compact and accurate display can be obtained as compared with the formation of through holes. .

[0007]

FIG. 1 is an explanatory perspective view of a main part showing a specific embodiment of a display device according to the present invention.

The display comprises a circuit board 1 and a light-transmitting cover 2 provided on the upper surface of the circuit board 1. The circuit board 1 is a known wiring printed board, having a wiring pattern in a plane, and a plurality of light emitting elements (light emitting diodes) 3 mounted on the wiring pattern. In the embodiment, the red light emitting diode 3a and the green light emitting diode 3b are set as one set and have the same display dot. Each light emitting diode 3a, 3b
Are electrically connected to an electrode portion 31 and a wiring pattern of the substrate 1 by wire bonding 32. As shown in FIGS. 1 and 3, common and individual leads (pins) 33 protrude outward from the substrate 1 for each light emitting element 3.

The light-transmitting cover 2 is made of a hard or soft transparent resin plate (eg, an acrylic resin plate or a polycarbonate resin plate) and has a size substantially the same as that of the circuit board 1. The transparent resin cover 2 is a transparent plate having a certain thickness, and has a plurality of inward concave portions 21 provided in a plane. In the embodiment, as shown in FIG.
Sixteen concave portions 21 are provided, and a total of 256 concave portions 21 are formed. The surface of each concave portion 21 has a rough surface 2
1a (see FIG. 2). That is, each recess 21
Is surface-processed in a satin shape, and, for example, a portion corresponding directly above the light emitting element 3 is set in a concave lens shape. The concave portion 21 has a hemispherical cross section and has a light emitting element (3a, 3b) 3
And is set to individually surround each light emitting element 3.

In the display having such a configuration, a large number of concave portions 21 are formed in the surface of the transparent resin cover body 2 and are recessed inward, and the surface of the concave portion 21 is formed as a rough surface 21a.
The light-emitting elements (red light-emitting element 3a and green light-emitting element 3b) 3 for one dot are accommodated in each of the recesses 21a. Therefore, the form of the light emitting element 3 itself, which is surrounded by the concave part (rough surface 21a) 21, the wiring pattern of the circuit board 1, and the bonding wire 32
Is not accurately seen from the outside, and has a good appearance as a display. The red light emitting element 3a and the green light emitting element 3
When b is turned on at the same time, the projection light from each of the light emitting elements 3a and 3b does not directly pass through the transparent cover body 2 but becomes diffused light on the roughened rough surface 21a of the concave portion 21 and becomes outside the transparent cover body 2. Emits toward Therefore, not only the lighting light source points of the light emitting elements 3a and 3b cannot directly appear, but also complete mixed color light (orange light) is projected outward, and the overall display feeling is improved. In addition, since the surface has a structure in which the light emitting element 3 is surrounded by the concave portion 21 having a rough surface, the display direction angle is wide and the display can be seen well from the lateral direction, and the directivity of the display is improved. Further, since a plurality of recesses 21 are formed on the inner surface of the transparent resin plate, resin molding is easier and dot density can be increased as compared with formation of through holes, and a small and accurate display device can be obtained. it can.

In the embodiment, a concave portion 2 having a hemispherical cross section is used.
1 is shown, but it is needless to say that the concave portion 21 may be formed as a substantially rectangular hole instead of a hemispherical shape in practice.

[0012]

According to the present invention, as described above, a plurality of recesses for accommodating one dot of light emitting element are provided on the inner surface of the light transmitting cover which covers the upper surface of the circuit board on which the plurality of light emitting elements are mounted. Since the surface of the concave portion is made to be a rough surface, the concave portion of the rough surface cannot show the appearance of the light emitting element itself, the wiring pattern, the existence of the bonding wires, and the like, so that the appearance of the display is good. Also, since the light emitted from the light emitting element is diffused by the rough surface, it is projected outward,
The light source point of the light emitting element is not allowed to be seen from the outside, but perfectly mixed color light (orange light) is projected outward, and the overall display feeling is improved. In addition, since the surface has a structure in which the light emitting element is surrounded by the concave portion of the rough surface, the display directivity angle is wide and the display can be seen well from the lateral direction, and the directivity of the display is improved. Furthermore, since only a large number of recesses are formed in the transparent resin plate, the resin molding technique is simple, the dot density can be increased, and a compact and highly accurate display device can be obtained. Has excellent effect achieved.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a partial cross section of an embodiment display device.

FIG. 2 is a cross-sectional view of a main part showing an example display.

FIG. 3 is a side view showing the embodiment display.

FIG. 4 is a plan view showing a transparent resin cover body of the example display.

FIG. 5 is a sectional view of a main part showing a conventional display.

FIG. 6 is a sectional view of a main part showing another conventional display.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit board 2 Transparent resin cover 3 Light emitting element 21 Concave part 21a Rough surface

Claims (1)

(57) [Scope of request for utility model registration] 1. A circuit board on which a plurality of light-emitting elements are mounted, and a light-transmitting cover disposed on an upper surface of the circuit board. A display device comprising: a plurality of recesses for accommodating an element; and the surface of each of the recesses is a rough surface for light diffusion.