JPH0432890A - Light emitting diode display element - Google Patents

Abstract

PURPOSE:To properly change the arrays and combination of plural kinds of light emitting diode lamps, to properly adjust light distribution characteristics and to improve generality by properly combining and arraying plural light emitting diode lamps having respectively different light emitting quantity. CONSTITUTION:Plural kinds of light emitting diode lamps 14, 15 having respectively different light emitting quantity are properly combined and arrayed. The lamps 14 having high light emitting quantity and the lamps 15 having low light emitting quantity are properly combined and arrayed to adjust light distribution characteristics. Since the light distribution characteristics corresponding to various purposes such as characteristics having high center luminance intensity and characteristics having a large half angle can be adjusted, the display device can be allowed to easily correspond to each purpose and the generality can be improved.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a light emitting diode display element forming one pixel of an electronic display panel, etc., and in particular, the present invention relates to a light emitting diode display element forming one pixel of an electronic display panel, etc. The present invention relates to a light emitting diode display element that can be used.

(Prior Art) Generally, a large number of light emitting diode display elements of this type are arranged on an electronic display panel, etc., for example, 16 rows and 16 columns (16×1
6=256) in a matrix-like arrangement, one character, figure, etc. is displayed in λ.

Therefore, one light emitting diode display element shows one dot of one character, figure, etc. displayed with 256 dots.

Conventionally, as this type of light emitting diode display element, the 13th
There is one constructed as shown in the figure and FIG. 14.

This light emitting diode display element 1 is made of, for example, polycarbonate and has a plurality of light emitting diode lamps (hereinafter referred to as LED lamps) 3 arranged in a matrix of, for example, three rows and three columns and housed in a rectangular tube-shaped main body case 2.

As shown in FIG. 15, each LED lamp 3 has an LED chip 3d built into a cylindrical resin lens 3a made of, for example, transparent epoxy resin and whose tip is chamfered into a dome shape, and an anode and a cathode of the LED chip 3d. An anode lead wire 3c and a cathode lead wire 3d, which are connected to each other, are made into a pair and protrude outward from the disc-shaped substrate 3e.

The anode lead wire 3C is formed longer than the cathode lead wire 3d, so that both 3c and 3d can be distinguished from each other in appearance.

A plurality of LED lamps 3 configured in this manner are erected in a matrix shape on, for example, a rectangular plate-shaped printed circuit board 4.

The printed circuit board 4 is fitted and fixed into the main body case 2, and the entirety thereof and the lower half of the head of each LED lamp 3 are buried in a black sealing material 5 such as resin, and the adjacent LED lamps 3 are
, 3... are sealed, and the upper part of the head of each LED lamp 3 is exposed on the front opening end 2a side of the main body case 2.

The main body case 2 has a back opening on the opposite side to the front opening end 2a, and pulls out the harness 6 connected to the printed circuit board 4 to the outside, and also attaches it to a pair of upper and lower mounting ears 7a and 7b in the figure using mounting screws or the like (not shown). They are attached to the main body of a display panel, such as an electronic display panel, so that they are arranged in a matrix.

Incidentally, the light distribution characteristics of the light emitting diode display element 1 configured as shown in FIG. 13 are as shown in FIG.
It is.

Here, the half-value angle is defined as 100% of the central luminous intensity, which is the luminous intensity at the center of the light emitting diode display element 1, and the proportion of the luminous intensity visible from a direction tilted at a required angle θ with respect to the central axis is reduced by approximately 50%. The angle at which

(Problem to be Solved by the Invention) Generally, the light distribution characteristics required for the light emitting diode display element 1 used for information purposes such as an electronic display board are such that the central luminous intensity is 6 cd or more, and the horizontal luminous intensity is 32°
In some cases, more than LCD is required.

However, although the above-mentioned conventional light emitting diode display element 1 has a high central luminous intensity and excellent visibility from the front, there is a problem in that the visibility from the left and right directions of 18 degrees is extremely poor when the luminous intensity is reduced to below LCD. be.

The present invention has been made in consideration of the above circumstances, and its object is to provide a light emitting diode display element whose light distribution characteristics can be adjusted as appropriate.

[Structure of the invention]

(Means for Solving the Problems) The present invention solves the problem of the conventional example, which is configured by arranging a plurality of light emitting diode lamps of a single type with the same amount of light emission. or almost single,
This was done in view of the fact that the light distribution characteristics cannot be adjusted appropriately, and is constructed as follows.

In other words, the present invention is characterized in that a plurality of light emitting diode lamps of a plurality of types having different amounts of light emitted are arranged in appropriate combinations.

Further, the present invention is characterized in that the light emitting diode lamp is configured to increase the amount of light emitted by increasing the number of light emitting diode pellets contained therein.

(Operation) <First invention> The light distribution characteristics can be adjusted by appropriately changing the combination and arrangement of a light emitting diode lamp that emits a large amount of light and a light emitting diode lamp that emits a small amount of light.

Therefore, according to the present invention, it is possible to adjust various light distribution characteristics according to the application, such as light distribution characteristics with high central luminous intensity and light distribution characteristics with a large half-value angle, so that it can be quickly adapted to the application, and is also versatile. You can improve your sexuality.

<Second invention> In addition, the light emitting diode lamp increases the amount of light emitted by increasing the number of light emitting diode pellets,
Since the number of light emitting diode lamps themselves does not increase,
It is possible to prevent the light emitting diode display element from increasing in size and to reduce costs.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 3 is a plan view of one embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along the TV-TV line in FIG. Inside the cylindrical main body case 12, a plurality of LED lamps 13. ... are arranged and accommodated in a matrix of, for example, 3 rows and 3 columns.

These LED lamps 13 consist of a first LED lamp 14, which has a large amount of light emitted, as shown in FIGS. 1 and 2, for example, and an LED lamp 3, which has a smaller amount of light emitted, as shown in FIGS. 15 and 16, for example. 2nd LED lamp 15
The types are appropriately combined and arranged on the printed circuit board 16.

As shown in FIGS. 1 and 2, the first LED lamp 14 is a solid cylindrical resin lens 14a made of transparent epoxy resin and whose tip is beveled into a dome shape. Two planar semicircular LED chips 14b and 14c are electrically connected in series with their semicircular flat surfaces facing each other, and the light is focused by the convex lens effect of the resin lens 14a. It is designed to let you do so.

The first LED lamp 14 has a larger amount of light emitted than the second LED lamp 15 made up of the LED lamp 3 shown in FIG. 15 because it has one more LED chip 14b, 14c.

The first LED lamp 14 has one LED chip 14b.
The outer end length of the anode side lead wire 14d connected to the anode side of the other LED chip 14c is made slightly longer than the outer end length of the cathode side lead wire 14e connected to the cathode side of the other LED chip 14c, Both 14d and 14e can be distinguished from each other in appearance.

The printed circuit board 16 on which the two types of LED lamps 14 and 15 are erected in this manner is coaxially fitted into the main body case 12 and fixed at its axially intermediate portion.

These LED lamps 13 are buried below the lower half of their heads with a black sealing material 17 made of resin to fill the gaps between adjacent LED lamps 13 and 13 and fix them.

On the other hand, the main body case 12 has a pair of upper and lower outward locking claws 18a, 1.8b for temporary fixing protruding from the outer surface of its rear surface, and a harness 19 electrically connected to the printed circuit board 16. is pulled out of the main body case 12 through the through hole 20.

Two types of first and second LED lamps 14.1 in the light emitting diode display element 11 configured in this way
For example, as shown in FIG. 5(A), by appropriately combining 5.
A first LED lamp 14 is installed in each corner and center of a matrix arrangement of 3 rows and 3 columns, and a second LED lamp is installed in the other parts.
As shown in FIG. 5(B), the light distribution characteristics when the D lamps 15 are arranged are such that the central luminous intensity is about 6.5 cd or more, and the horizontal luminous intensity is about lcd or more at 32 degrees or more.

This light distribution characteristic matches the light distribution characteristic for information display described above, indicating that this arrangement is suitable for an information display panel.

In other words, this embodiment shows that by appropriately combining the first and second LED lamps 14, 15 and changing their arrangement as appropriate, the light distribution characteristics can be adjusted as appropriate.

For example, as shown in FIG. 6(A), the first LED lamp 1
When only 4 is arranged in a matrix of 3 rows and 3 columns, the light distribution characteristics are distributed as shown in FIG. 6(B), and the half-value angle can be significantly increased.

Similarly, as shown in FIG. 7(A), FIG. 8(A) and FIG. 9(A), the first and second LED lamps 14.1
7 (B), 8.
It is possible to obtain the light distribution characteristics shown in FIG. 9(B) and FIG. 9(B), respectively.

10(A) to 10(C) respectively show a main body case 21 that is an improved version of the main body case 12 shown in FIGS. 3 and 4, and this main case 21 is attached to an electronic display panel (not shown), etc. An eaves 22 protruding forward is integrally provided on the top plate located above, and the main body case 2
The feature is that a plurality of hemispherical protrusions 23, 23, . . . are provided protruding from each outer surface of 1.

Therefore, according to this embodiment, when the main body case 21 is gripped and held manually, the plurality of hemispherical protrusions 23 catch the fingers or the like, so that the gripping and holding can be carried out reliably.

For this reason, when the main body case 21 is manually grasped and held in order to replace the light emitting diode display element, etc., it is possible to prevent the main body case 21 from slipping from the hand, and it is possible to improve the efficiency of the attachment/detachment work. .

In addition, since the hemispherical protrusion 23 is provided on the main body case 21,
The surface area of the main body case 21 is expanded, and the heat dissipation effect can be improved.

Note that the hemispherical protrusion 23 is not limited to its shape; for example, it may be a rectangular piece-shaped rectangular protrusion 23a as shown in FIGS. ~
As shown in (C), the slit 23b may be a rectangular long hole.

These also make it possible to increase the reliability of gripping and holding the main body case 21, and it is possible to achieve the same effects as in the embodiments described above.

〔Effect of the invention〕

As explained above, in the present invention, a plurality of light emitting diode lamps of a plurality of types having different light emission amounts are appropriately combined and arranged, so that the light distribution characteristics can be adjusted as appropriate by appropriately changing the arrangement and combination. It is possible to increase versatility.

In addition, since the amount of light emitted by a light emitting diode lamp is increased by increasing the number of light emitting diode pellets, the number of light emitting diode lamps themselves is increased to prevent the size of the light emitting diode display element and to reduce costs. be able to.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the first LED lamp shown in FIG.
2 is a rear view of FIG. 1, FIG. 3 is a plan view of an embodiment of the light emitting diode display element according to the present invention, FIG. 4 is a sectional view taken along the line ■-IV of FIG. 3, and FIG. A) is a plan view showing one arrangement method of LED lamps in the embodiment shown in FIG. 3, FIG. 5(B) is a light distribution characteristic diagram of FIG. A) is a plan view showing other arrangement methods of LED lamps, and Figures 6 (B) to 9 (B) are each figure (A).
FIGS. 10(A) to 10(C) are a plan view, a side view, a bottom view, and a side view showing a modification of the embodiment shown in FIG.
1 and 12 (A) to (C) are a plan view, a side view, and a bottom view showing other modified examples, respectively. FIG. 13 is a plan view of a conventional light emitting diode display element, and FIG. 14 is a plan view of a conventional light emitting diode display element. Fig. 13 is a cross-sectional view along the Ju-Bosan line, Fig. 15 is a vertical cross-sectional view of the LED lamp shown in Fig. 13, Fig. 16 is a plan view of Fig. 15, and Fig. 17 is the light emission shown in Fig. 13. FIG. 3 is a light distribution characteristic diagram of a diode display element. DESCRIPTION OF SYMBOLS 11... Light emitting diode display element, 12... Main body case, 13... LED lamp, 14... First lamp, 14b, 14c・LED chip, 15...
Second lamp, 23... hemispherical projection, 23a... rectangular projection, 23b... slit.

Claims (1)

[Scope of Claims] 1. A light emitting diode display element characterized by being formed by appropriately combining and arranging a plurality of light emitting diode lamps of a plurality of types having different amounts of light emission. 2. The light emitting diode display element according to claim 1, wherein the light emitting diode lamp is adapted to increase the amount of light emitted by increasing the number of light emitting diode pellets contained therein.