JPH0533185U - LED luminous display - Google Patents

Abstract

(57) [Abstract] [Purpose] The LE with a clear contour of the light emitting part and good display quality
An object is to provide a D light emitting display. [Structure] From the center on the wiring board 1 to form a triple concentric circle
The LED lamps 2 serving as ED light emitters are arranged. 18 LED lamps 2 are provided on the outermost circumference of the wiring board 1, 6 LED lamps 2 are provided on the intermediate circumference, and 3 pieces are provided on the inner circumference. LED
The lamps 2 are arranged at regular intervals to form the light emitting section 11, and the wiring board 1 is housed in the case frame 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an LED light emitting display used as, for example, a light emitting pixel (dot) of a large display device installed outdoors.

[0002]

[Prior Art]

 As the LED light emitting display 100, for example, as shown in FIGS. 6 and 7, a large number of LED lamps 2 are arranged concentrically on the wiring board 1 as LED light emitting bodies, and a case frame 6 having an open front surface is formed. In some cases, a circular light emitting portion 110 is formed by being housed in. This LED lamp 2 is formed by encapsulating an LED chip 4 with a transparent resin 3 whose tip is formed into a spherical shape and which functions as a circular convex lens, and an electrode lead 5 for external wiring is led out. The lead wire 7 extending from the wiring board 1 to the outside is connected to a power source (not shown) to turn on / off the LED lamps 2 at the same time.

Such an LED light emitting display 100 can be used alone, or can be arranged in a large number vertically and horizontally on an outer wall of a building such as an outdoor to form a large screen in a dot matrix form. It becomes possible to display desired characters, symbols, etc. by controlling the lighting of each body 100 as one light emitting part (dot) by an external controller.

[0004]

[Problems to be solved by the device]

 However, in the above LED light-emitting display 100, the LED lamps 2 having the same luminous intensity are arranged on the wiring board 1 in a substantially uniform manner, although the arrangement is different depending on the shape of the light-emitting portion such as concentric circles. Generally, when the LED lamps 2 are evenly arranged on the wiring board 1 in this way, the LED lamps 2 are evenly lit over the entire surface, which corresponds to the ambient brightness. In order to secure the display image quality, there is a problem that the number of the LED lamps 2 to be installed is inevitably increased, which is disadvantageous in cost. In addition, when a large-screen display body is configured to display desired characters and symbols by light emission, there is a problem that the outline when viewed as one dot as a light emitting portion tends to be blurred.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the LED light-emitting display body of the present invention has the same grade of luminous intensity in the LED light-emitting display body in which a large number of LED light-emitting bodies are arranged on a wiring board to form a light-emitting portion. When arranging the LED light emitters, the density of the LED light emitters on the periphery of the light emitting portion is reduced in the vicinity of the center so that the light emission brightness in the periphery of the light emitter is the It is characterized in that it is higher than the light emission brightness in the vicinity. Or, when arranging LED luminous bodies having different luminous intensity, the luminous intensity near the center should be lower than the luminous intensity of the LED luminous bodies on the periphery of the above-mentioned light emitting part, It is characterized in that the emission brightness of is higher than that near the center.

[0006]

[Action]

 In the LED light-emitting display body having the above configuration, by reducing the arrangement density of the LED light-emitters arranged near the center with respect to the arrangement density of the LED light-emitters arranged near the periphery of the wiring board, The number of LED light-emitting bodies provided is smaller than that of the conventional LED light-emitting display, and the cost can be reduced. Further, if the number of LED light-emitting bodies provided is the same as the number of conventional light-emitting display bodies, the density of arrangement of light-emitting parts near the periphery can be made higher, and an LED light-emitting display body that is brighter than that in appearance can be obtained. .. Moreover, when each LED light-emitting body is turned on, the light emission brightness near the periphery of the light-emitting portion is higher than the light emission brightness near the center, so that it is possible to perform a display in which the contour portion is brighter and clearer than the center. Accordingly, when a large number of dot matrix light emitting display bodies are formed by arranging a large number of these LED light emitting display bodies vertically and horizontally, the contours of the respective LED light emitting display bodies become bright and clear. When the characters and symbols having a dot configuration are displayed by using as a light emitting part, the outline of each dot is relatively bright and clear even in a bright place, and the contrast is good, and the display image quality is good.

By making the luminous intensity of the LED luminous body arranged near the center lower than the luminous intensity of the LED luminous body arranged at the periphery of the light emitting portion, the vicinity of the center has a low grade. Since it can be used as an LED light emitter, the cost can be reduced. In addition, since the light emission luminance near the periphery of the light emitting portion is higher than the light emission luminance near the center, it is possible to perform a display in which the contour portion is brighter and clearer than the center.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of an LED light emitting display according to an embodiment of the present invention, and FIG. 2 is a schematic vertical sectional view taken along the line AA of FIG. The LED light-emitting display body 10 shown in the figure, like the LED light-emitting display body 100 described above, has a large number of LED lamps 2 having substantially the same luminous intensity as the LED light-emitting body arranged on the wiring board 1 and having an opening at the front. The light emitting portion 11 having a circular shape is formed by being housed in the case frame body 6, and since the respective configurations are substantially the same as those described above, the same members are designated by the same reference numerals. The description will be omitted, and the arrangement of the LED lamp 2 on the wiring board 1, which is a feature of the present invention, will be described.

That is, in the LED light-emitting display 10 of the present invention, the LED lamps 2 serving as LED light-emitting bodies are arranged in a triple concentric shape from the center on the wiring board 1, and the circular light-emitting portion 11 is provided. 18 LED lamps 2 are arranged on the outermost circumference, 6 LED lamps 2 are arranged on the middle circumference, and 3 LED lamps 2 are arranged on the inner circumference at regular intervals. Has been done. Therefore, the number of the LED lamps 2 arranged on the wiring board 1 is smaller than the conventional LED light-emitting display 100 except for the outermost circumference, and the number of the LED lamps 2 arranged on the inner side is smaller, and the number of parts is reduced accordingly. Has been planned. Further, the disposition density near the periphery of the wiring board 1, that is, the luminance density is higher than that near the center of the wiring board 1, and the light emission luminance near the periphery is higher than the light emission luminance near the center. Becomes a slightly darkened LED light-emitting display 10 that is lit and displayed.

However, in the LED light-emitting display 10 of the present invention, although the number of LED lamps 2 arranged is reduced and the illuminance as a whole is slightly lowered, when all the LED lamps 2 are turned on, light is emitted. Since the light emission brightness near the periphery of the part 11 is higher than the light emission brightness near the center, the display body has a bright and clear outline, and if the outline is bright and clear, it is practically dark even if the vicinity of the center is slightly dark. It is difficult to perceive, and the decrease in brightness of the LED light-emitting display 10 as a whole cannot be realized, and on the contrary, a clear display with little glare is obtained.

As described above, the LED light-emitting display body 10 which is displayed with a bright and clear outline is used by turning it on and off independently, and is also arranged outdoors vertically and horizontally to form a large dot matrix light-emitting display body. Can be used even if the LED is formed, and each LED light-emitting display 10 is used as one light-emitting portion to form one light-emitting dot, and when a desired character or symbol is selectively lighted and displayed in a dot structure, the light is turned on. Since the outline of each LED light-emitting display body 10 is bright and clear, each dot that constitutes a desired character or symbol to be displayed looks bright and clear, is easy to see, has good contrast, and has a good display quality. Will be good.

Here, in the LED light emitting display 10 of the present invention, the shape of the light emitting portion 11 may be circular or rectangular as in the embodiment, or may be another shape. Good. Further, in this case, the boundary between the periphery and the center of the light emitting portion 11 is set regardless of whether the shape of the light emitting portion is circular or rectangular as shown in FIGS. 3 and 4. The distance L2 (same as L2 ') to the boundary between the periphery and the center with respect to the diameter or width L1 (same as L1') is set within the range of 3L2 ≤ L1 and preferably 5L2 ≤ L1. Also, the distance L2 to the boundary depends on the diameter size of the LED lamp 2, but at least about 3 mm is required. Therefore, based on the above-mentioned conditions, the LED light-emitting display 10 of the present invention is suitable for a large size with L1 of at least 15 mm or more, and more preferably 40 mm or more where the number of LED lamps 2 is increased.

Further, the shaded portions in FIGS. 3 and 4 are the portions where the emission luminance near the periphery of the light emitting portion 11 is calculated, and the unmarked portions are the portions where the emission luminance near the center is calculated. The ratio of the emission brightness H1 near the periphery to the emission brightness H2 near the center is preferably in the range of 0.3 <H2 / H1 <0.7. If the ratio is 0.3 or less, the area near the center will be dark and only the contours will be noticeable, resulting in a reduction in the display image quality. If the ratio is 0.7 or more, it will approach the conventional product and the LED lamp 2 will be installed. Since the effect of reducing the number is small, the above range is preferable. Since the LED lamp 2 is essentially a point light source for the light emission brightness near the periphery and the center, the average light emission brightness (specifically, LED lamps having the same light emission intensity) is used. Needless to say, when two LED lamps are arranged, the density of the LED lamps 2 is arranged.

If the same number of LED lamps 2 as those of the conventional LED light-emitting display body 100 are used, the arrangement density near the periphery of the light-emitting portion can be made higher, so that the LEDs are brighter than they seem. It can be a light emitting display.

Then, as shown in FIG. 5, the LED chip 4 as an LED light emitter is arranged as shown in FIG. 1 on the wiring board 1 having the through holes 1c and the conductive patterns 1a and 1b formed on the front and back surfaces. After wire bonding and wiring directly on the substrate 1, they are each resin-sealed with a translucent resin 8 such as silicon rubber, and corresponding to each LED chip 4, for example, a circular protrusion is formed on the front side thereof. The lens body 9 may be integrally formed. Even when the LED chip 4 is directly disposed and resin-sealed, and the convex lens body 9 is integrally molded, the wiring board 1 constituting each LED light emitter is housed in the case frame body 6, the above LED light emission is also performed. Similar to the display body 10, when the light is turned on, the light emission luminance near the periphery is higher than the light emission luminance near the center, so that the light emitting display body has a bright and clear outline, and it is almost impossible to realize a decrease in the overall brightness of the LED. It becomes a light emitting display.

In each of the above-described embodiments, the LED light-emitting display body configured by resin-sealing the LED lamp 2 or the LED chip 4 having the same luminous intensity and arranging the LED chip 4 on the wiring board 1 has been described. By disposing an LED lamp having a higher luminous intensity than each LED lamp near the center near the periphery of the part, the same action and effect as described above can be obtained. For example, the conventional arrangement of LED lamps as shown in FIGS. 6 and 7 is adopted as it is, and only the 18 LED lamps near the periphery of the light emitting portion, that is, the outermost circumference are assumed to have high luminous intensity. By substituting to make the luminous intensity of other LED lamps brighter, the luminance of light emission at the periphery of the light emitting portion is higher than that near the center, and similar to the LED light emitting display 10, the periphery of the light emitting portion is near the center when lighting. A brighter and clearer luminescence display will be possible. In this case, the setting of the boundary between the periphery and the center of the light emitting portion, the preferable conditions for the ratio of the emission brightness, and the like are exactly the same as those in the above embodiment.

It should be noted that the light emitting portion is composed of a large number of LED light emitters having different light emission colors, for example, LED light emitters emitting red and green, and selective lighting control (three-color display) is possible for each light emission color. In this case, it goes without saying that the LED light emitters for each emission color may be arranged so that the emission brightness at the peripheral edge of the light emitting portion becomes higher than the emission brightness near the center for each emission color. ..

Further, in each embodiment, the LED light emitting display body 10 in which one light emitting portion 11 is configured by one case frame body 6 and one wiring board 1 is shown. However, for example, a plurality of light emitting portions are arranged in a horizontal row. The light emitting portion may be integrally formed, or an LED light emitting display (not shown) may be formed by forming a plurality of light emitting portions in a vertical and horizontal dot matrix.

[0020]

[Effect of the device]

 As is clear from the above description, in the LED light-emitting display 10 of the present invention, the number of LED light-emitters provided is reduced and the light-emission brightness near the periphery of the light-emitting portion is compared with the light-emission brightness near the center. This makes it possible to display brighter and clearer contours by increasing the height, and it is possible to achieve clear lighting with less glare, with brightness that does not hinder practical use as a whole even if the center area is slightly dark.

[Brief description of drawings]

FIG. 1 is a front view of an LED light emitting display according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the same embodiment taken along the line AA of FIG.

FIG. 3 is a schematic explanatory view for explaining a peripheral portion and a central portion of the present invention in a circular shape.

FIG. 4 is a schematic explanatory diagram illustrating a rectangular shape around the periphery and the center of the present invention.

FIG. 5 is an enlarged schematic cross-sectional view of a main part according to another embodiment of the present invention.

FIG. 6 is a front view of a conventional LED light emitting display.

7 is a schematic cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiring board 2 LED light-emitting body 6 Case 10 LED light-emitting display body 11 Light-emitting part

Claims (2)

[Scope of utility model registration request] 1. An LED light-emitting display body in which a large number of LED light-emitting bodies are arranged on a wiring board to form a light-emitting portion, wherein the arrangement density of the LED light-emitting bodies at the periphery of the light-emitting portion is
An LED light-emitting display body, characterized in that the arrangement density in the vicinity of the center is reduced and the emission brightness in the vicinity of the periphery of the light-emitting portion is made higher than the emission brightness in the vicinity of the center. 2. An LED light emitting display in which a large number of LED light emitting bodies are arranged on a wiring board to form a light emitting portion, wherein the luminous intensity of the LED light emitting bodies arranged at the periphery of the light emitting portion is An LED light-emitting display body, characterized in that the light-emission intensity of an LED light-emitter disposed near the center is low and the light-emission brightness near the periphery of the light-emitting portion is higher than the light-emission brightness near the center.