JPS636760Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light emitting diode display without light leakage.

In recent years, as various devices have become more multi-functional, displays have become more diverse.Among them, audio equipment uses numbers to represent frequency and volume to multiple points, and clocks use digital displays to display the time, as shown in Figure 1. Combinations of so-called numeric displays and bar-shaped multi-point displays, which display and selectively light up the days of the week, are increasing. When such a composite display is performed using a display device using a light emitting diode as a light source, since the light emitting diode is small, the reflective frames 13 and 14 and the light diffusion sheet 19 are used to display the desired shape and uniformly over the entire display surface. However, the reflective frames 13 and 14
There are the following differences between the case where the through holes are combined in a diagonal shape or the like to display numbers and the like, and the case where the through holes in the shape of a square pyramid are lined up to perform a multi-point display. That is, since the picture elements for displaying numbers and the like are long and narrow, the transparent side walls tend to have a complicated shape. On the other hand, a square pyramid-shaped through hole has a large opening area but a simple shape, and the light diffusion sheet used for it is a color different from that of the numerical display, or characters are printed on it. Because of these differences, it is easier to manufacture the reflective frames and to assemble them by separating the reflective frame 14 for number display and the reflective frame 13 for multi-point display. However, since the reflective frame 13 for multi-point display is elongated, it is difficult to fix it to the substrate 11. In other words, since the reflective frame is a white resin molded product, normally a protruding pin is provided on the reflective frame, a through hole is provided on the substrate, the protruding pin is inserted into the through hole, and the tip is welded and fixed. If it becomes long and thin, not only will there be no room for the protruding pin in the center of the bottom surface, but if the protruding pin is somehow removed, a recess called a sink will be formed at the position corresponding to the protruding pin on the surface, and even if the light diffusion sheet 19 is pasted, the The recess becomes noticeable. In addition, if the protruding pins are not provided, a gap approximately the height of the light emitting diode (200 to 400 μm) will be created between the board and the bottom of the reflective frame, resulting in large light leakage, resulting in a dark display and the presence of adjacent objects. It is inconvenient that the picture elements that are supposed to be lights appear to be lit. When an adhesive is used, the adhesive layer acts as a light pipe, so this light leakage increases over time.

The present invention has been made to correct the above-mentioned drawbacks, and will be described in detail below based on embodiments.

FIG. 2 is a perspective view of a light emitting diode display according to an embodiment of the present invention, in which reference numeral 1 denotes a substrate having printed wiring (not shown), on which a large number of light emitting diodes 2, 2, . . . 2 are arranged and fixed. Reference numerals 3 and 4 denote reflective frames made of white resin molded products, and the reflective frame 3 surrounds the light emitting diode 2 and has through holes 5, 5...5 whose surface openings are approximately square.
It has an elongated shape and is arranged on the substrate 1. The reflective frame 3 has a stepped portion 6 projecting downward from the side surface in the longitudinal direction, and is latched to the substrate 1 at only the end portion or welded with a protruding pin as required. On the other hand, a light emitting diode 2 is mounted on the reflective frame 4.
Through holes 7, 7 surrounding the surface and having a substantially rectangular opening on the surface...
7 are arranged in a diagonal shape so that numbers etc. can be displayed, and are fixed to the substrate 1 by welding with protruding pins (not shown), but the reflective frame 4 is sufficiently large. Therefore, sink marks will not occur even if a protruding pin is provided. This reflective frame 4 is provided with a stepped portion 8 that engages with the stepped portion 6 of the reflective frame 3. When the reflective frame 4 is fixed to the substrate 1, the stepped portion 8 comes into contact with the stepped portion 6, and the reflective frame Press the body 3 against the substrate 1. Reference numerals 9 and 9 denote light diffusion sheets which are attached or laid on the surfaces of the reflective frames 3 and 4 with an adhesive or the like. The light diffusion sheets 9, 9 are colored or printed in different colors as necessary.

As described above, the present invention comprises a first resin molded product having a substrate, a plurality of light emitting diodes placed and fixed on the substrate, and a resin molded product placed on the substrate and having a through hole surrounding the light emitting diodes. and a light emitting diode display having a second reflective frame and a light diffusion sheet laid on the surface of the reflective frame, wherein the first reflective frame is elongated and protrudes downward from the side surface in the longitudinal direction. A light emitting diode display device having a stepped portion, and the second reflective frame is provided with a stepped portion that engages with the stepped portion of the first reflective frame and presses the first reflective frame against the substrate. Therefore, there are no surface irregularities,
Furthermore, there is no light leakage not only at the ends but also at approximately the center.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional display, and FIG. 2 is a perspective view of a light emitting diode display according to an embodiment of the present invention. 1... Substrate, 2, 2... 2... Light emitting diode, 3, 4... Reflective frame, 5, 5... 5, 7, 7
...7...Through hole, 6,8...Step part, 9,9...Light diffusion sheet.

Claims (1)

[Scope of utility model registration request] first and second reflective frames comprising a substrate, a plurality of light emitting diodes placed and fixed on the substrate, and a resin molded product placed on the substrate and having a through hole surrounding the light emitting diodes; and a light emitting diode display having a light diffusion sheet laid on the surface of the reflective frame, wherein the first reflective frame is elongated and has a step portion protruding downward from the side surface in the longitudinal direction, and A light emitting diode display characterized in that the second reflective frame is provided with a stepped portion that engages with the stepped portion of the first reflective frame and presses the first reflective frame against the substrate.