JP4363551B2 - Display lamp and display device - Google Patents

Description

  The present invention relates to a display lamp in which a large number of three types of LEDs (Light Emitting Diodes) emitting three primary colors (red, green, and blue) of light are housed in a housing, and a display device using the display lamp.

In the conventional LED numerical display panel, seven segments of LEDs are arranged and lit in sections. For example, Patent Document 1 discloses a display device (electric display panel) in which seven segments of LEDs and the like are arranged. Such a segment is comprised from the display lamp which combined LED as shown in patent document 2. FIG. In the display lamp disclosed in Patent Document 2, 25 LEDs are arranged in 5 rows and 5 columns.
JP 2001-51626 A JP-A-8-31221

  However, in the display lamp disclosed in Patent Document 2, 25 LEDs are configured in a single color such as red or green. A display device using such a display lamp is monochromatic and hardly catches the eye. In addition, since the display lamps are arranged in 5 rows and 5 columns, in the display device using this display lamp, “.” And the character shape become “.” And characters with emphasized corners.

  In view of the above, an object of the present invention is to construct a display lamp using three primary color LEDs and to change the display lamp to multiple colors more than three colors by selectively emitting each LED of the display lamp. Moreover, the display apparatus which displays a character or a number as a character shape close | similar to a natural body using this display lamp is provided.

  The display lamp of the present invention (referred to as an “LED cluster”) is configured as an LED assembly in which a large number of three types of LEDs emitting three primary colors of light are arranged in a single rectangular rectangular housing, and each LED is displayed as a display color. For example, four or more colors can be developed from a distance of 10 m or more, for example, by switching on and turning on correspondingly.

A display lamp according to a first aspect is a display lamp arranged in a matrix for a display unit, and includes a rectangular housing having four sides and three types of LEDs that emit three primary colors of light within the housing. LED assemblies arranged on the circumference centered on the center, and a filler filling the space between the LED assemblies and the housing, and in the vicinity of four sides of the LEDs arranged on the circumference The adjacent interval between the arranged LEDs is larger than the adjacent interval between the LEDs arranged near the four corners of the four sides.
By arranging such LEDs, the light quantity of adjacent display lamps becomes constant when the display lamps are arranged in a matrix.

The LED aggregate of the display lamp according to the second aspect is formed by dispersing and arranging the light amounts of the three types of LEDs at equal rates.
For example, if one red LED has a weak light amount, a large number of red LEDs are arranged in the housing.

  The LED assembly of the display lamp of the third aspect includes an LED disposed on a circumference of a first radius centered on the center of the housing, and a second larger than the first radius centered on the center of the housing. And LEDs arranged on the circumference of the radius.

  In the display lamp of the fourth aspect, the LEDs arranged on the circumference of the first radius are arranged at equal intervals, and arranged in the vicinity of the four sides among the LEDs arranged on the circumference of the second radius. The distance between adjacent LEDs is larger than the distance between adjacent LEDs arranged in the vicinity of the four corners of the four sides.

  In the display lamp of the fifth aspect, the LEDs arranged on the circumference of the second radius are arranged so that adjacent colors do not become the same color with three types of LEDs as one set.

The LED of the display lamp of the sixth aspect comprises a lead wire, an LED chip connected to the lead wire, and a sealing resin that covers the LED chip, and the filler has a large contact area with the sealing resin. In this way, the tip end where the filler is in contact with the sealing resin is closer to the lead wire side than the LED chip.
By adopting such a configuration, the LED has a structure having durability against wind and rain.
Further, a shader and a drip-proof shader are provided on one side of the housing.
Further, the display device of the seventh aspect arranges a plurality of display units in which the above display lamps are arranged in a required matrix. The display device can display letters or numbers.

The display device can display a plurality of colors in addition to the three primary colors at a distance of, for example, 10 m or more, and has weather resistance.
In addition, an electric display panel having a display unit in which the display lamps are arranged in a matrix can express environmental information such as temperature, humidity, wind speed, or sulfur oxide concentration in the atmosphere by changing the color with numerical values in a sensual manner. You can change the color of the numbers and display them so that you can intuitively understand the numerical characters such as the competition scores and earthquakes.

<Configuration of LED cluster>
1A is a front view of the high-intensity first LED cluster 10, and FIG. 1B is a side view of the first LED cluster 10. The first LED cluster 10 includes an LED aggregate 1G composed of a number of LEDs 1 that emit any one of the three primary colors (R, G, B), and a polycarbonate housing 2. In the LED assembly 1G, for example, 21 LEDs 1 are housed in a polycarbonate casing 2. In FIG. 1B, only five LEDs 1 are drawn to help understanding, and the colors of the LEDs 1 are indicated by R, G, and B.

  A polycarbonate casing 2 shown in FIG. 1A has a rectangular shape of 4 cm × 4 cm. As shown in FIG. 1 (B), the polycarbonate housing 2 has a shader 5 extending long on the upper side of the housing 2, and has side walls 3 on the other three sides. Since the first LED cluster 10 is often used outdoors, it is provided to prevent sunlight from directly hitting the LED aggregate 1G as much as possible. An attachment base 4 is provided on the back surface of the polycarbonate housing 2. When the first LED cluster 10 is used outdoors, the mounting base 4 is inclined with respect to the side wall 3 because it may be disposed at a position higher than the human eye. Depending on the installation height of the first LED cluster 10, the inclination angle of the mounting base 4 may be changed or made flat. A wiring cable 9 connected to the terminal of each LED 1 is disposed on the mounting base 4.

  As shown in FIG. 1A, in the LED assembly 1G, one red (R) LED 1 is arranged in the center of the housing 2, and the first radius centered on the red (R) LED 1 has a first radius. The LEDs 1 are arranged at equal intervals on the circumference C1. The LED 1 is arranged on the circumference C2 of the second radius centered on the red (R) LED 1.

  On the circumference C2 of the second radius, three primary color (R, G, B) LEDs 1 constitute one set to form an RGB set 1S, and four RGB sets 1S are arranged. The distance between the LEDs 1 on the circumference C2 of the second radius is wide in the region close to the four sides of the housing 2. That is, in the region close to the side, the distance between the adjacent LEDs 1 is the distance X1 or the distance Y1, which is wider than the distance between the adjacent LEDs 1 in the RGB set 1S.

  Further, the arrangement of the LED 1 on the circumference C1 of the second radius and the LED 1 on the circumference C2 of the second radius is such that the red (R), green (G) and blue (B) LEDs 1 are not adjacent to each other as much as possible. To place. For example, when the blue (B) LED 1 is caused to emit light, the brightness from the entire first LED cluster 10 is equalized. In FIG. 1A, the red (R) LED 1 is arranged at the center, but one LED is not necessarily arranged at the center.

For example, the LED assembly 1G shown in FIG. 1A includes nine red (R), six green (G), and six blue (B), which are red (R), green (G) It is because each light quantity (candela: cd) of blue (B) LED1 is different even if it is the same current voltage. If an equal amount of light can be obtained with the same current voltage, the LED assembly 1G may be composed of 18 red (R), 6 green (G), and 6 blue (B). As will be described later, colors such as orange, magenta, cyan, and white can be created by equalizing the light amounts of red (R), green (G), and blue (B) in the LED assembly 1G. In this embodiment, when all of the red (R) 9, green (G) 6 and blue (B) 6 (all manufactured by Nichia) are turned on, the amount of light of each color becomes equal. , It is displayed in white as a whole. In the white display, the first LED cluster 10 can obtain a luminance of 6500 cd / m ² .

  By arranging the LEDs 1 in the housing 2 as described above, the first LED cluster 10 can color orange, magenta, cyan, white, and the like in addition to primary color emission of blue, green, and red. That is, the relationship between the display color of the first LED cluster 10 in FIG. 1A and the number of selected lights is as shown in Table 1 so that it can be clearly identified and visually recognized even at a distance.

Table 1
In addition to the display colors shown in Table 1, the first LED cluster 10 lights six blue (B) and three green (G) to emit cyan near blue or red (R). Nine and three green (G) can be lit to emit orange near red.

  If the distance between the first LED cluster 10 and the human eye is, for example, 10 m or less, the light of each LED 1 is recognized, but the distance between the first LED cluster 10 and the human eye is 10 m or more. If so, it is difficult for the human eye to individually identify the red (R), green (G), and blue LEDs 1 in the first LED cluster 10, and the first LED cluster 10 has orange, magenta, cyan, and white colors. Is recognized as colored. Note that the distance between the first LED cluster 10 and the human eye varies depending on human visual acuity and the like between nighttime and daytime, but is 3 to 4 m when short and about 20 m when long.

  FIG. 2 is a cross-sectional view of the first LED cluster 10 shown in FIG. Note that five LEDs 1 are not arranged in a certain section, but five LEDs 1 are drawn in FIG. 2 to help understanding.

  The LED 1 includes a mold resin 13 and lead wires 8 including an anode lead and a cathode lead. In the LED assembly 1G of the first LED cluster 10, the terminals of the lead wires 8 of the respective LEDs 1 are soldered to an epoxy substrate 6 that is an insulating material. The epoxy substrate 6 is fixed within the region surrounded by the shader 5 and the side wall 3 of the housing 2 with the bottom surface 2B of the housing 2 as the Z plane. The surface of the epoxy substrate 6 is filled with the mold resin 13 and the lead wires 8 with the filler 7 in order to prevent water droplets and dust. The filler 7 is preferably a black resin for preventing reflection of sunlight and for highlighting the colors of the red (R), green (G) and blue (B) LEDs 1. As such a filler 7, a heat-resistant / light-resistant adhesive silicone resin is suitable.

  FIG. 3 is an enlarged cross-sectional view showing one LED 1, and FIG. 3 (B) is a view showing a state in which the force of the arrow AR in FIG. is there.

  The LED 1 is a so-called radial type (also called a cannonball type), and an LED chip 11 is connected to the tips of two lead wires 8, and the lead wire 8 and the LED chip 11 are covered with a mold resin 13 made of epoxy resin. It has been broken. The filler 7 between the adjacent LEDs 1 is applied so that the cross section is U-shaped. The uppermost point 7T at which the filler 7 is in contact with the mold resin 13 covers up to a position Z1 that is substantially the same height as the LED chip 11 or slightly lower. When the uppermost point 7T of the filler 7 becomes higher than the height of the LED chip 11, it becomes difficult to see the light of the LED 1 from the oblique direction of the first LED cluster 10, and there is a possibility that it can be seen only from the front of the first LED cluster 10.

  Further, the lowest point 7B of the filler 7 may be a position higher than the lowest point 13B of the mold resin 13. The distance Z2 between the uppermost point 7T and the lowermost point 7B of the filler 7 should be as large as possible. This is to make it easy for water drops such as rain on the first LED cluster 10 to flow.

  As shown in FIG. 3B, when a large force is applied to the arrow AR in FIG. 3A, the filler 7 may be cracked. When such a crack occurs, dust and water droplets accumulate in the crack and shorten the life of the first LED cluster 10. The filler 7 is preferably an elastic silicone resin so that such cracks do not occur.

  FIG. 4A is a diagram showing the second LED cluster 31, and uses a polycarbonate casing 2 of 5 cm × 5 cm. The second LED cluster 31 constitutes an LED assembly 1G using 45 LEDs 1.

  As shown in FIG. 4A, in the LED assembly 1G, one red (R) LED 1 is disposed in the center of the housing 2, and the first radius of the LED assembly 1G is centered on the red (R) LED 1. The LEDs 1 are arranged at equal intervals on the circumference C1. The LED 1 is arranged on the circumference C2 of the second radius centered on the red (R) LED 1. In addition, on the circumference C2 of the second radius, the LEDs 1 of the three primary colors (R, G, B) constitute one set to form an RGB set 1S, and the RGB sets 1S are evenly arranged. Many LEDs 1 can be arranged in a large case such as a polycarbonate case 2 of 5 cm × 5 cm. In such a case, on the circumference outside the circle C2 on the circumference of the second radius, the configuration of the RGB set 1S makes it easy to emit colors such as orange, magenta, cyan, and white as LED clusters.

  On the circumference C3 of the third radius, eight sets of RGB sets 1S of the three primary colors (R, G, B) are arranged. The LED 1 on the circumference C3 of the third radius is wider than the interval between the adjacent LEDs 1 in the RGB set 1S in the region close to the four sides of the housing 2. That is, only the outermost periphery is not evenly spaced.

  The second LED cluster 31 includes an LED assembly 1G including 17 red (R), 14 green (G), and 14 blue (B). The LED 1 of the second LED cluster 31 is the same LED as the LED 1 of the first LED cluster 10 shown in FIG. For this reason, since the ratio of the amount of red light in the second LED cluster 31 increases, the light amount of the red (R) LED 1 is lowered by a current regulator such as a variable resistor (not shown). Further, when the brightness of green (G) is too weak or the brightness of blue (B) is too weak, the light amount of the green (G) or blue (B) LED 1 may be increased by the current adjuster, or the RGB set Several green (G) LEDs 1 or blue (B) LEDs 1 may be added to 1S.

  FIG. 4B shows the third LED cluster 33, which uses a 7 cm × 7 cm polycarbonate casing 2. The second LED cluster 31 constitutes an LED assembly 1G using 69 LEDs 1.

  As shown in FIG. 4 (B), the LED assembly 1G includes a red (R) LED 1 at the center of the housing 2 and an LED 1 having a second radius on the circumference C2. The second LED in FIG. Arranged in the same manner as the cluster 31. On the circumference C3 of the third radius, the LEDs 1 of the three primary colors (R, G, B) form one set, and the RGB set 1S is evenly arranged. The third LED cluster 33 further has an RGB set 1S arranged on the circumference C4 of the fourth radius, and eight sets of RGB sets 1S are arranged. The LED 1 on the circumference C4 of the fourth radius is wider than the interval between the adjacent LEDs 1 in the RGB set 1S in the region close to the four sides of the housing 2. That is, only the outermost periphery is not evenly spaced.

  The third LED cluster 33 also uses the same LED 1 as the second LED cluster 31 to increase the light amount of red (R) LED 1 with a current regulator such as a variable resistor (not shown) when the proportion of the red light amount increases. Is lowered. Thereby, when all the three primary color (R, G, B) LEDs 1 are lit, the third LED cluster 33 emits white light.

<Configuration of lightning display panel>
FIG. 5A is an example of the electronic display panel 100 that displays numbers. The electronic display panel 100 has three number display units 50 arranged therein. In the number display unit 50, the first LED clusters 10 are arranged in five rows and seven columns. The number display unit 50 shown in FIG. 5 displays “23%”.

  FIG. 5B is an enlarged view of the circular portion of FIG. 5A, and shows a state where the first LED clusters 10 are arranged in 2 columns and 2 rows. As shown in FIG. 5B, in the state where the first LED clusters 10 are arranged in two columns and two rows, a space SS is formed on the diagonal line of the first LED clusters 10. It is necessary to increase the amount of light in this space SS. On the other hand, if the space SP is not formed in the X direction or the Y direction, the amount of light is excessively increased in the LEDs 1 of the adjacent first LED clusters 10. Therefore, in the area close to the four sides of the shader 5 and the side wall 3, the interval between the adjacent LEDs 1 in the first LED cluster 10 is wide.

  FIG. 6 is a control system diagram of the number display unit 50 using the first LED cluster 10. This number display unit 50 is an example of displaying the outside air temperature and humidity on a road, for example. The temperature sensor S is a sensor that detects the outside air temperature and humidity. The AD conversion circuit 21 converts an analog signal into a digital signal. The CPU 22 outputs numeric information and color information previously associated with the numeric information to the drive circuit 23.

  The drive circuit 23 sends a signal to the LED cluster 10 in the numeric display unit 50 based on the numeric information. The drive circuit 23 is connected to an optical sensor 24 that measures the amount of external light. The light sensor 24 measures whether it is night or day according to the brightness of the surroundings.

With such a configuration, the numeric display unit 50 performs the following operations.
First, the temperature sensor S detects the outside air temperature or humidity. The detected analog signal is converted into a digital signal by the AD conversion circuit 21 and input to the CPU 22. The CPU 22 sends a signal indicating the detected temperature numerical information and display color according to the temperature to the drive circuit 23. Table 2 shows examples of display colors that are output according to the outside air temperature input by the CPU 22. For example, when the outside air temperature is minus 3 degrees, only the blue LED 1 emits light in the LED cluster 10, and a signal for displaying “−1” is sent to the drive circuit 23. For example, if the outside air temperature is 23 degrees, the red and green LEDs 1 emit light and a signal for displaying “23” is sent to the drive circuit 23. The drive circuit 23 sends a signal for driving the LED cluster 10 based on these signals. At that time, the drive circuit 23 determines whether it is nighttime or daytime based on a signal from the light sensor 24, and if it is nighttime, the LED cluster 10 is driven with a small current.

Table 2

  FIG. 7 shows an example of an electric display panel 110 that displays characters. The electric display panel 110 has two character display units 55 arranged therein. The character display unit 55 is configured by arranging the first LED clusters 10 in 12 rows and 12 columns.

  The character display unit 55 can display Chinese characters because the first LED clusters 10 are arranged in 12 rows and 12 columns. Also, as described above, a plurality of colors can be displayed. For example, “hot” can be displayed in red and “cold” can be displayed in blue.

The number display unit 50 and the character display unit 55 described above use the first LED cluster 10, but the same applies when the second LED cluster 31 or the third LED cluster 33 is used.

  Although LED1 demonstrated above was what is called a radial type, LED for surface mounting (SMD) is also marketed. When such a surface-mounting LED is used, the arrangement of the LED aggregates and the like may be arranged in the same manner as in the present embodiment only by reducing the thickness of the filler 7.

FIG. 2 is a front view and a side view of the first LED cluster 10. 2 is a cross-sectional view of the first LED cluster 10. FIG. It is an enlarged view of LED1, the filler 7, and the epoxy substrate 6. FIG. 3 is a front view of a second LED cluster 31 and a third LED cluster 33. FIG. 1 is a front view of a numeric light display panel 100 provided with a numeric display unit 50. FIG. FIG. 4 is a control system diagram of the numerical display unit 50. FIG. 6 is a front view of a character electro-optical display board 110 provided with a character display unit 55.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... LED, 1S ... LED set, 1G ... LED assembly 2 ... Case 3 ... Side wall 4 ... Mounting base 5 ... Shader 6 ... Epoxy substrate 7 ... Filler 8 ... Lead wire 9 ... Wiring cable 10 ... 1st LED cluster 11 ... LED chip 13 ... Mold resin 21 ... AD conversion circuit 22 ... CPU
DESCRIPTION OF SYMBOLS 23 ... Drive circuit 24 ... Optical sensor 31 ... 2nd LED cluster 33 ... 3rd LED cluster 50 ... Number display unit 55 ... Character display unit 100 ... Electric display panel 110 for numbers ... Electric display panel S for characters ... Temperature sensor or humidity Sensors C1, C2, C3, C4 ... circumferences with different radii

Claims (8)

A display lamp arranged in a matrix for the display unit,
A rectangular housing having four sides;
An LED assembly in which three kinds of LEDs emitting three primary colors of light are arranged in a circle around the center of the case in the case;
A filler that fills a space between the LED assembly and the housing;
Among the LEDs arranged on the circumference, the adjacent interval of the LEDs arranged in the vicinity of the four sides is larger than the adjacent interval of the LEDs arranged in the vicinity of the four corners by the four sides. An indicator lamp characterized by.   The display lamp according to claim 1, wherein the LED aggregate is dispersedly arranged at a rate at which the light amounts of the three kinds of LEDs are equal to each other. The LED assembly, the a first radius LED arranged on a circumference of around the center of the housing, the housing circumferential center to center and the large second radius than the first radius The display lamp according to claim 1, further comprising an LED disposed on the display lamp. The LEDs arranged on the circumference of the first radius are arranged at equal intervals,
Among the LEDs arranged on the circumference of the second radius, the adjacent intervals of the LEDs arranged in the vicinity of the four sides are the adjacent intervals of the LEDs arranged in the vicinity of the four corners by the four sides. The display lamp according to claim 3, wherein the display lamp is larger .   4. The display lamp according to claim 3, wherein the LEDs arranged on the circumference of the second radius are arranged so that adjacent colors do not become the same color as a set of the three kinds of LEDs. 5. . The LED comprises a lead wire, an LED chip connected to the lead wire, and a sealing resin that covers the LED chip,
The filler is filled in such a way as to increase the contact area with the sealing resin, and the tip of the filler in contact with the sealing resin is closer to the lead wire than the LED chip. The display lamp according to any one of claims 1 to 5.   The display lamp according to any one of claims 1 to 6, wherein a shader and a drip-proof shader are provided on one side of the housing.   A plurality of the display units in which the display lamps according to any one of claims 1 to 7 are arranged in a required matrix are arranged to display characters or numbers recognized as a plurality of colors other than the three primary colors from a position separated by a predetermined distance. Display device.