JP2571743Y2 - Surface light collector for dot matrix light-emitting displays - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light collector for obtaining desired directional characteristics by arranging on a surface of a dot matrix light emitting display constituted by using LED light emitting elements.
About.

[0002]

2. Description of the Related Art As this type of dot matrix light emitting display, for example, those having a structure as shown in FIGS. 9 and 10 are known. That is, in this dot matrix light-emitting display body, a large number of LED light-emitting elements 7 are arranged and connected on a wiring substrate 2 in a vertical and horizontal direction, and a mask plate 3 in which a large number of mortar-shaped through holes 9 are formed in a vertical and a horizontal direction is joined. L corresponding to each through hole 9
The light emitting dots 4 are formed in an XY matrix by accommodating and disposing the ED light emitting elements 7 and sealing the inside of each through hole 9 with a light transmitting resin 10.

In such a dot matrix light emitting display, each light emitting dot 4 is connected to an external driving and lighting circuit (not shown) to perform selective lighting control, so that desired characters, figures, symbols, luminescent colors and the like can be obtained. Although it is a convenient device that can display a display pattern by light emission, it has the following problems.

[0004]

That is, in the above-described dot matrix light emitting display, the light emitted from each LED light emitting element 7 is reflected in each through hole 9 and diverged and emitted to the surroundings. When the lighting is controlled in a place where the surroundings are bright by placing it outdoors or the like, there is a problem that the relative luminance at the practical visual field position is low, the display is unclear, the display contrast is reduced, and the visibility is deteriorated. Was. Moreover, in such a dot matrix light emitting display, if the surface shape of the translucent resin 5 that seals the through hole 9 is changed to, for example, a convex lens shape, the directional characteristics of light emission can be adjusted. It is difficult to similarly seal a large number of through-holes 9 with resin so as to emit light having directional characteristics, and this is not common in terms of mass productivity.

[0005]

In order to solve the above problems, a surface light collector for a dot matrix light emitting display according to the present invention has a large number of through holes formed on a wiring board on which a large number of LED light emitting elements are arranged vertically and horizontally. A dot matrix light-emitting display element is provided on a surface of a dot matrix light-emitting element in which a plurality of light-emitting dots are formed vertically and horizontally by arranging a mask plate formed in each of the LED light-emitting elements corresponding to each through-hole. Surface light collector for

[0006] A through hole corresponding to the light emitting dot is provided vertically and horizontally, and a translucent convex lens body is disposed at an opening of each through hole.

[0007]

In the surface light-collecting plate for a dot matrix light-emitting display having the above structure, each LED light-emitting element of the dot matrix light-emitting display in which a large number of light-emitting dots are formed vertically and horizontally by housing LED light-emitting elements in respective through holes. When the desired characters and symbols are illuminated and displayed by selectively controlling lighting, the light emitted from each luminescent dot passes through the through-hole corresponding to each through-hole of the front light collector installed on the surface, and passes through the opening. The light is condensed by the lens action of the translucent convex lens body disposed on the opposite side, and light emission having sharp directional characteristics can be obtained. Therefore, the front light collector is arranged on the surface of the dot matrix light emitting display P to control the lighting of the light emitting dots, and the desired characters,
When display patterns such as figures and symbols are displayed in a dot configuration, light leakage to adjacent light emitting dots is prevented by the front light collector, and the display contrast at the time of turning on and off the light emitting dots is improved. The directivity characteristic is changed by the light-transmitting convex lens body, and the display can be changed to a dot matrix light-emitting display body having a desired display with a bright display at a practical visual field position and a good display contrast.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a surface light collector 1 according to one embodiment of the present invention and a dot matrix light emitting display P on which the surface light collector 1 is disposed, and FIG. It is a schematic expanded sectional view along a line.

The surface light collector 1 of this embodiment is, for example, a dot matrix light-emitting display P in which 8 × 8 light-emitting dots 4 are formed in a matrix by bonding a mask plate 3 on a wiring board 2.
It is arranged on the surface of.

A wiring board 2 constituting the dot matrix light emitting display P on which the front light collector 1 of this embodiment is disposed
Is a method in which eight conductive patterns 5a (for example, a group of Y patterns on the cathode side) are formed on the surface of a copper-clad laminate made of glass epoxy, paper phenol, or the like by etching or the like, and horizontally on the back surface. Eight conductive patterns 5b (for example, a group of X patterns on the anode side) are formed, and the conductive pattern 5b on the back surface is led out to the surface of the wiring substrate 2 for each light emitting dot 4 by a through hole 6. Then, an LED light-emitting element 7 as a light-emitting element is fixed on each lead-out portion with a conductive paste such as a silver paste, and is connected to the conductive pattern 5a on the substrate surface with a bonding wire 8 to form an XY matrix lighting circuit (dynamic lighting). Circuit).

The mask plate 3 bonded to the surface of the wiring board 2 is made of a rubber elastic material such as silicone rubber or neoprene rubber.
Corresponding to the light emitting element 7, 8 × 8 mortar-shaped through holes 9 whose inner surface is a white or silver light reflecting surface are formed vertically and horizontally.

The wiring board 2 and the mask plate 3
And the LED light emitting elements 7 are accommodated and arranged in the respective through holes 9 and are respectively resin-sealed with the translucent resin 10.
8 × 8 luminescent dots 4 are formed vertically and horizontally by making the surface concave or flat.

Such a dot matrix light emitting display P
The surface light collector 1 of the present invention, which is arranged on the surface of the present invention, has a rubber elastic body such as silicone rubber or neoprene rubber similar to the mask plate 3 or a molded plate-shaped light collector body 11 made of polycarbonate resin, noryl resin or the like. 8 × 8 cylindrical through holes 11a are formed in the mask plate 3 corresponding to the respective light emitting dots 4 in the vertical and horizontal directions, and the inner peripheral surface of the through holes 11a is white or silver light reflection. The surface of the light collector is a black or gray light non-reflective surface. A translucent convex lens body 13 formed of a rubber elastic body such as transparent silicone rubber having translucency is fitted into the upper opening 12 of the through hole 11a. The translucent convex lens body 13 is made of, for example, a transparent silicone rubber, an acrylic resin, a polycarbonate resin, or the like, formed into a substantially hemispherical shape so as to exhibit a convex lens function.

Such a front light collector 1 is used by being arranged on the surface of a dot matrix light emitting display P as shown in FIG. 3, and each conductive pattern 5a, 5
b is connected to an external drive circuit (not shown), and the lighting of the light emitting dots is controlled by a program of a controller constituted by a CPU or the like so that desired characters, figures, symbols, etc. are lighted and displayed. The light emitted from
The opening 1 is emitted into each through hole 11a of the corresponding light collector main body 11 without light leaking to the adjacent light emitting dot 4.
The light is condensed by the lens function of the light-transmitting convex lens body 13 and emitted as light having sharp directional characteristics. That is, the surface light collector 1 of the present invention
Accordingly, the directivity of each light emitting dot 4 of the dot matrix light emitting display P can be easily changed. Therefore,
If the radius of curvature of the translucent convex lens body 13 closing the through-hole 11a of the light collector main body 11, that is, the focal length of light or the arrangement distance between the lens position and the light emitting element is changed, the directional characteristics of the transmitted light are changed. Can be easily changed, and without changing the configuration of the dot matrix light-emitting display body P, the height of the front light collector 1 and the shape of the light-transmitting convex lens body 13 are changed in design to change the light-emitting display body P. By simply installing the light source on the surface of a light-collecting plate, it is possible to easily provide a dot matrix light-emitting display element having a directional characteristic that matches a desired practical visual field position, and a good display contrast due to the light non-reflective surface of the light collector surface. Become.

FIG. 4 is a schematic longitudinal sectional view showing a state in which the surface light collector 15 of another example of the present invention is disposed on the dot matrix light emitting display P. The front light-collecting plate 15 covers the entire surface of the front light-collecting plate 15 by connecting the light-transmitting convex lens bodies 13a fitted into the openings 12 of the through holes 11a of the light-collecting plate main body 11 by the connecting portions 16, respectively. It has a configuration. When the light-transmitting convex lens bodies 13a are connected by the connecting portion 16 in this manner, the moldability is improved, for example, a large number of light-transmitting convex lens bodies 13a can be integrally formed, and the surface light collector 15 can be formed efficiently. Can be. Further, the surface light collector 15a shown in FIG.
The upper inner peripheral surface 11b having a thickness T1 as a black or gray light non-reflective surface and the lower inner peripheral surface 11c having a thickness T2 as a white or silver light reflecting surface as shown in FIG. They may be distinguished. In this case, when the thickness of the surface light collector 15a is T and the light reflection surface is widened by setting T1 <T2 or T2 = T, the light reflection efficiency on the inner peripheral surface is improved and the light passes through the light-transmitting convex lens body 13a. If the light emission luminance is increased, and conversely, if T1> T2 or T1 = T and the light non-reflective surface is widened, the light emission luminance of the light emitting dot 4 is reduced, but the display contrast ratio at the time of turning on / off is increased. In this way, the design of the light emission luminance and the contrast ratio can be easily changed according to the necessity such as the brightness of the installation location. Therefore, the change of the directivity and the like can be made extremely without changing the configuration of the dot matrix light emitting display P itself. It will be easier.
It is practically preferable that T1 is in the range of T / 4≤T1≤T / 2.

Each of the surface light collectors 1, 15,
15a collects the light emitted from each light emitting dot 4 of the dot matrix light emitting display P through the corresponding through hole 11a by the translucent convex lens body 13, 13a.
As a preferable range in design, the surface light collector 15a shown in FIG.
As shown in the figure, considering the focal length of the translucent convex lens body 13a as the outer diameter R of the through hole 11a,
The distance H (see FIG. 4) to the LED light-emitting element 7 in FIG.
7R <H <1.5R, this translucent convex lens element 1
The radius of curvature r of 3a can be changed within the range of 0.5H <r <H so that the dot matrix light emitting display P has a desired directional characteristic. At this time, the thickness T of the light collector main body 11 of the front light collector 15a is preferably in a range of about 0.5H <T <0.7H.

Further, if the thickness t1 of the connecting portion 16 of the light collector main body 11 is large, light leaks into the adjacent through-hole 11a or the display contrast is reduced, so that the thickness t1 of the connecting portion 16 is outside the through-hole 11a. It is preferable that the diameter R be in the range of t1 <R / 4, and practically, it is 1 mm or less, and the thickness is as thin as possible. Also, if the protruding length t2 of the translucent convex lens body 13a becomes longer (higher), the protruding portion of the lens body blocks the light non-reflective surface, which causes a reduction in display contrast. For this reason, it is preferable to set t2 <R / 4 in the range, since the display contrast becomes good. In this case, in order to limit the projection length t2 of the translucent convex lens body in order to maintain good display contrast and to shorten the focal length of the lens body, a convex lens body 13b shown in FIG. Good.

As the front light collector 15b, the horizontal direction is shown in FIG.
6. The translucent convex lens body 1 of the composite lens body, which is the same as the schematic sectional view shown in FIG.
3b may be provided in the corresponding through-hole 11a. In the surface light collector 15b in which the translucent convex lens body 13b is such a compound lens body, the focal length of the convex lens body 13b is short, and each viewing angle when the luminance at the 0 ° position in front is 100%. In the left-right direction, the relationship of the relative luminance ratio is the luminance distribution of the characteristic curve (a) shown in FIG. 8, and in the up-down direction, the luminance distribution is the characteristic curve (b) of FIG. As a result, the directional characteristics in the vertical direction can be further narrowed and adjusted so as to obtain good visibility at a desired practical visual field position.

The front light collector 15 can be used by arranging it on the surface of a dot matrix light emitting display Pa as shown in FIG. The dot matrix light-emitting display element Pa has an outer diameter R of the through hole 11a of the front light collector 15.
A light emitting dot 41 whose outer diameter R1 satisfies R1 ≦ 2R / 3 is formed. Through holes 91 having a diameter smaller than the through hole 11a are provided vertically and horizontally, and the surface has a black or gray light. The mask plate 31 serving as a reflection surface and the wiring board 2 are integrally joined. When the surface light-collecting plate 15 is arranged on the surface corresponding to each small-diameter light-emitting dot 41 of such a dot matrix light-emitting display body Pa, most of the light emitted from the small-diameter light-emitting dot 41 directly Since the light is emitted to the translucent convex lens body 13 and condensed, the directivity becomes sharper, and since the total area of the light non-reflection surface of the surface of the mask plate 3 is large, it is difficult to display the light when displaying. There is an advantage that the display contrast ratio is improved.

Here, as a specific design example of the surface light collector 15 of the present invention, R = φ6.5 mm of the light collector body 11,
The radius of curvature r of the translucent convex lens bodies 13 and 13a is 5.5.
mm, and the thickness H1 of the mask plate 3 (see FIG. 4) is H1 =
When 2.0 mm and H = 7.0 mm were arranged on the surface of the dot matrix light emitting display P, the luminance distribution was as shown by the characteristic curve (a) shown in FIG. 8, and the dot matrix light emitting display P was used alone. It can be seen that the luminance half-value angle is narrower than when the luminance distribution at this time becomes the characteristic curve (c) in FIG.

Although the inside of each through hole 11a of the light collector main body 11 of the surface light collectors 1, 15, 15a is illustrated as being hollow, the light transmitting resin 10 or the light transmitting It may be filled with a translucent resin or the like having substantially the same light refractive index as the convex lens bodies 13 and the like, and in this case, the directional characteristics and the like are not particularly affected.

The light-transmitting convex lens members 13 are not limited to being transparent, and may have a light transmittance of 60 to 90% and may be colored with smoke or smoke brown to have a light-transmitting property. The display contrast can be improved even when the display is lit in a relatively bright place.

The present invention has been described with reference to one embodiment. However, the present invention is not limited to the above embodiment. For example, the number of light emitting dots 4 may be 16 × 16 or 24 ×.
In the case of a dot matrix light-emitting display element such as 24 dots, a surface light collector having a through-hole provided with a light-transmitting convex lens element may be used, and various design changes are acceptable. It is.

The dot-matrix light-emitting display device according to the present invention, in which the surface light collector is mounted and used, is a device in which one light-emitting dot is provided with a plurality of LED light-emitting elements having different emission colors such as red and green. In this case, it is preferable to dispose each LED light emitting element as close to the center of the light emitting dot as possible, because the color separation (difference in directivity) for each light emitting color is small. In addition, it is practically preferable to arrange the LED light emitting elements having different emission colors so that the vertical direction is symmetrical at the time of mounting within one light emitting dot, because the color separation in the left and right direction is small.

[0026]

As is apparent from the above description, in the surface light collector for the dot matrix light emitting display of the present invention, light transmitted through the through-hole is condensed by the lens function of the translucent convex lens body. Therefore, by installing on the surface of the dot matrix light emitting display, light from each light emitting dot is emitted into the through hole without leaking to the adjacent light emitting dot, and the contrast of each light emitting dot is improved, and the light emitting display is This has the effect that the directional characteristics and the like can be changed without changing the configuration of itself.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view illustrating a use state of a surface light collector for a dot matrix light emitting display according to an embodiment of the present invention.

FIG. 2 is a schematic enlarged sectional view taken along line AA of FIG.

FIG. 3 is a schematic enlarged cross-sectional view showing a state in which the surface light collector of the embodiment is arranged on a dot matrix light emitting display.

FIG. 4 is a schematic enlarged cross-sectional view showing a state in which a surface light collector according to another example of the present invention is disposed on a dot matrix light emitting display;

FIG. 5 is a schematic enlarged sectional view of a surface light collector according to still another example of the present invention.

FIG. 6 is a schematic enlarged cross-sectional view showing a state in which still another example of the front light collector of the present invention is arranged on a dot matrix light emitting display.

FIG. 7 is a schematic enlarged cross-sectional view showing a state in which the surface light collector of the present invention is arranged on a dot matrix light emitting display of another configuration.

FIG. 8 is a directional pattern diagram showing a range of directional characteristics of the dot matrix light emitting display using the surface light collector of the present invention shown in FIGS. 1, 3, and 6;

FIG. 9 is a schematic perspective view showing a conventional dot matrix light emitting display.

FIG. 10 is a schematic enlarged sectional view taken along line BB of FIG. 9;

[Explanation of symbols]

 1,15,15a Surface light collector 2 Wiring board 3 Mask plate 4 Light emitting dot 7 LED light emitting element 9 Through hole 11a Through hole 12 Opening 13,13a, 13b Translucent convex lens body

Claims (1)

(57) [Scope of request for utility model registration] 1. A mask board in which a large number of through holes are formed vertically and horizontally is arranged on a wiring board on which a large number of LED light emitting elements are arranged vertically and horizontally, and the LED light emitting elements corresponding to each through hole are accommodated and arranged. A dot matrix light emitting display surface light collector provided on a surface of a dot matrix light emitting display in which a number of light emitting dots are formed vertically and horizontally, wherein through holes corresponding to the light emitting dots are provided vertically and horizontally, and each through hole is provided. A light-collecting plate for a dot-matrix light-emitting display, wherein a light-transmitting convex lens body is arranged for each of the openings.