JPH0521458U - Semiconductor light emitting device - Google Patents

Abstract

(57) [Summary] [Object] To make it possible to satisfactorily view a mixed intermediate color from various angle directions in a light emitting diode configured to obtain an intermediate color by combining light emitting diode chips of a plurality of colors. [Configuration] Red light emitting diode chip 1 in the center of the square
Place 3. Green light emitting diode at 4 angles
Device chips 14a and 14b and blue light emitting diode chip 1
5a and 15b are arranged alternately.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a semiconductor light emitting device configured to obtain a mixed color by combining a plurality of light emitting elements.

[0002]

[Problems to be solved by conventional techniques and devices]

 There is a light-emitting diode that mounts a plurality of light-emitting diode chips of different emission colors and realizes a large number of emission colors by mixing these colors. 9 and 10 show a conventional light emitting diode of this type. In FIG. 9, red, green and blue light emitting diode chips 2, 3 and 4 are placed on the upper surface of the support plate 1, and in FIG. 10, one red light emitting diode chip 2 and one green light emitting diode chip 3 and two are mounted. The blue light emitting diode chips 4a and 4b are arranged. Various intermediate colors can be emitted by changing the emission intensity of the plurality of light emitting diode chips 2, 3, 4 or 2, 3, 4a, 4b and the combination thereof. However, in the above-mentioned light emitting diode, when the device is viewed obliquely from above, the light emission color of the light emitting diode arranged near that direction is dominant, and it is difficult to satisfactorily recognize the intermediate color.

Therefore, an object of the present invention is to provide a semiconductor light emitting device capable of satisfactorily recognizing mixed intermediate colors from various directions.

[0004]

[Means for Solving the Problems]

 According to the present invention for achieving the above object, a light emitting element of a first color is arranged at the center of a virtual polygon, and light emitting elements of second and third colors are alternately arranged at the vertices of the virtual polygon. The present invention relates to a semiconductor light emitting device configured to simultaneously emit light from the light emitting elements of the first, second and third colors having different emission colors.

Another aspect of the present invention is that a light emitting element is arranged at each apex of a virtual polygon, and the light emitting element is located outside the virtual polygon and is approximately equal to two adjacent apices of the virtual polygon. A light emitting element is also arranged at a point at a distance, and the light emitting elements at the vertices of a plurality of triangles formed by sequentially connecting two adjacent vertices of the polygon and the equidistant points are colored with each other. The present invention relates to a semiconductor light emitting device which is configured to emit light of different first, second and third colors and simultaneously emit light.

As described in claim 3, the light emitting element is arranged at the center of the virtual polygon, and the color of this light emitting element is made the same as the color of the light emitting element at equidistant points of claim 2. be able to.

[0007]

[Action]

 In the invention of each claim, the triangular arrangement areas of the light emitting elements of the first, second and third colors occur in a plurality of angular directions. Therefore, the mixed intermediate color can be satisfactorily recognized from an angle other than the direction of the vertical line passing through the center of the arrangement surface of the light emitting element.

[0008]

[First Embodiment] Next, a multicolor light emitting diode according to a first embodiment of the present invention shown in FIGS. 1 to 4 will be described. The light emitting diode of this embodiment comprises an insulating plate 11 as a support base, a light-transmissive resin encapsulant 12, and five light emitting diode chips 13 of three primary colors arranged on the main surface of the insulating substrate 11. , 14a, 14b, 15a, 15b.

The insulating substrate 11 is made of a high-performance resin having excellent heat resistance and resin moldability, and is formed into a dish shape by a well-known resin molding method. A recess 16 is formed on one main surface of the insulating substrate 11, and a bottom surface 16a of the recess 16 constitutes a light emitting element mounting region. The side surface 16b of the recess 16 is inclined at an inclination angle of about 45 ° with respect to the bottom surface 16a. An electrode body 17 having a desired pattern is formed on the side surface 16b and the bottom surface 16a of the recess 16 as shown by hatching in FIG. The electrode body 17 is composed of a metal layer having good reflection characteristics for light of various wavelengths emitted by the light emitting diode chips 13, 14a, 14b, 15a, 15b. Of the electrode bodies 17, the electrode bodies that extend to the four corners of the insulating substrate 11 extend to the other main surface side through the side surfaces of the insulating substrate 11, and the connection electrodes 18 are formed here. To do.

The light emitting diode chips 13, 14a, 14b, 15a, 15b are fixed to a bonding pad portion 17a, in which the electrode body 17 is partially widened, with a conductive adhesive. The upper surface electrodes of the light emitting diode chips 13, 14a, 14b, 15a, 15b are electrically connected to the electrode body 17 arranged in the vicinity thereof through the respective lead thin wires 19. The light emitting diode chips 13 to 15b and the thin lead wire 19 are covered with a light-transmissive resin encapsulant 12 filled in the recess 16.

A feature of the light emitting diode of the present embodiment is the arrangement relationship of the five light emitting diode chips 13 to 15b. That is, FIG. 4 shows the connection of the five light emitting diode chips 13 to 15b in FIG. The red light emitting diode chip 13 is connected between the first terminal T1 and the ground terminal T0. The two green light emitting diode chips 14a and 14b are connected between the second terminal T2 and the ground terminal T0. The two blue light emitting diode chips 15a and 15b are connected between the third terminal T3 and the ground terminal T0. When a mixed intermediate color is obtained, a voltage is applied to the first to third terminals T0 to T3 at the same time. As can be understood from FIG. 3 which conceptually shows the relative arrangement relationship of the light emitting diode chips 13 to 15b, in the light emitting diode of this embodiment, the five light emitting diode chips 13 to 15b are provided with the concave portions 16. Are arranged at the center point A of the polygon (quadrangle) on the bottom surface 16a and the points B to E that are equidistant from the center point A and form the vertices of a regular square. Further, the chip 13 arranged at the point A is a red light emitting diode chip, the chips 14a and 14b arranged at the points B and D are green light emitting diode chips, and the chips arranged at the points C and E. Reference numerals 15a and 15b are blue light emitting diode chips. As a result, four triangles (A-B-C, A-C) obtained by connecting the center point A and two adjacent square points (B and C, C and D, D and E, E and B) are connected. -D, A-D-E, A-E-B) have light emitting diode chips of three primary colors of red, green, and blue at their vertices, respectively, and form a light emitting source region of a mixed intermediate color of three primary colors. ..

When a voltage is applied to all the light emitting diode chips 13 to 15b at the same time to cause them to emit light at the same time, four mixed intermediate color lights are emitted at 90 degree intervals in the circumferential direction with the center of the bottom surface 16a of the recess 16 as the center of the circle. The area can be obtained. Therefore, the mixed intermediate color of red, green, and blue can be recognized well from various directions. That is, not only when the light emitting diode is viewed from the direction of the vertical line passing through the center of the bottom surface 16a, but also when the light emitting diode is viewed from the direction inclined to the vertical line, the red, green, and blue It is possible to recognize mixed neutral colors.

[0013]

Second Embodiment Next, a multicolor light emitting diode according to a second embodiment of the present invention shown in FIG. 5 will be described. The light emitting diode of this embodiment is different from the light emitting diode of the first embodiment shown in FIGS. 1 to 3 only in the part relating to the arrangement relationship of the light emitting diode chip, and the other parts are configured the same. Has been done. Therefore, FIG. 5 shows only the planar arrangement of the six light emitting diode chips 13a, 13b, 14a, 14b, 15a, 15b. In the light emitting diode of this embodiment, the device mounting area, that is, equilateral distances from the vertices A, B and C of the equilateral triangle (polygon) on the bottom surface 16a of the recess 16 shown in FIG. Therefore, six light emitting diode chips 13a to 15b are arranged at the vertices D, E, and F of three equilateral triangles circumscribing the above triangle ABC, and are configured to emit light at the same time. That is, the red light emitting diode chips 13a and 13b are arranged at the vertices A and E, the green light emitting diode chips 14a and 14b are arranged at the vertices B and F, and the vertices C and D are formed. Is provided with blue light emitting diode chips 15a, 15b. As a result, equilateral triangles (A-B-D, B-C-E) obtained from adjacent apexes of inner equilateral triangles (A-B-C) and vertices of outer equilateral triangles equidistant from them. , C-A-F) each have a light emitting diode chip of three primary colors at its apex, and form a light emitting source region of a mixed intermediate color of the three primary colors.

Therefore, according to the light emitting diode of this embodiment, the three mixed intermediate color light emitting regions are arranged at 120 ° intervals around the central mixed intermediate color region formed by the central triangle ABC. Therefore, the same effect as that of the first embodiment can be obtained.

[0015]

[Third Embodiment] FIG. 6 shows a chip arrangement in a light emitting diode according to a third embodiment. In this embodiment, the light emitting diode chips 14a, 13a, 14b and 13b are arranged in a virtual quadrangle (polygon) formed by connecting points B, C, D and E, and the center point A of this quadrangle is also arranged. The light emitting diode chip 15a is arranged, and further on the outer points F, G, H, and I, which are at equal distances from two adjacent vertexes B and C, C and D, D and E, and E and B, which are adjacent to each other. Also, light emitting diode chips 15b, 15c, 15d and 15e are arranged. In addition, 13a and 13b are red light emitting diode chips, 14a and 14b are green light emitting diode chips, and 15a to 15e are blue light emitting diode chips. Since the blue light emitting diode chips 15a to 15e emit less light than the red and green light emitting diode chips 13a to 14b, the balance of the three primary colors does not deteriorate even if this number is large.

When the nine light emitting diode chips 13a to 15e of FIG. 6 are made to emit light at the same time, eight triangles A-B-D, A-C-D, A-D-E, A-E-B, Eight mixed intermediate color regions are generated based on BFC, CGD, DHE, and BEI, and the same effects as those of the first and second embodiments are obtained. be able to.

[0017]

[Modification]

 The present invention is not limited to the above-mentioned embodiment, and the following modifications are possible, for example. (1) As shown in FIG. 7, green light emitting diode chips 14a, 14b and 14c and blue light emitting diode chip 15a are provided at each vertex of a hexagon (polygon) centering on the red light emitting diode chip 13. 15b and 15c can be alternately arranged to emit light at the same time. In addition, a light emitting diode chip for one of the three primary colors (for example, red) is placed at the center of the polygon with a larger number of angles, and the light emitting diodes for the remaining two colors (for example, green and blue) are arranged at the corners. The parts can be arranged alternately. (2) As shown in FIG. 8, vertices A, B, C, D of a quadrangle and points E, F, G, H equidistant from two adjacent vertices of the quadrangle, that is, points on the perpendicular bisector. The diode chips 13a, 14a, 13b, 14b, 15a, 15b, 15c, and 15d can be arranged to emit light at the same time. Here, 13a and 13b are red light emitting diode chips, 14a and 14b are green light emitting diode chips, and 15a to 15d are blue light emitting diode chips. The arrangement of FIG. 8 is equivalent to the arrangement in which the blue light emitting diode chip at the center point A of FIG. 6 is removed. (3) In the light emitting diodes of FIGS. 1 to 4, the chip arranged at the center point A is not limited to red. However, when the blue or green light emitting diode chips, which do not provide a relatively high luminous efficiency, are placed outside and the number of mounted chips is increased, a good mixed intermediate color can be obtained and a good intermediate color can be recognized. Large directional angle can be obtained. (4) The present invention is also effective when applied to a conventional light-emitting diode of the type in which a light-emitting diode chip is mounted on a conventional metal support plate on a plate or a printed circuit board. (5) The present invention can realize a wide-angle multicolor light emitting diode with sufficiently small directivity by itself, but of course, a light scattering agent or the like may be added to the sealing resin to enhance the mixing effect. (6) The resin encapsulation body 12 may be formed in a cylindrical shape or a lens shape. (7) The three sides of the triangular region, that is, the mixed neutral color light emitting source region, which is composed of the red, green, and blue light emitting diode chips, need not necessarily have the same length. (8) In the case of the light emitting diode of the type shown in FIGS. 4 and 7, when the red light emitting diode arranged at the central point has a sufficiently high luminous intensity as compared with other chips or is composed of a plurality of chips. The distance between the chips in the diagonal direction may be longer than one side of the polygon. (9) All the light emitting diode chips can be connected in series, or all the light emitting diode chips can be connected in parallel.

[0018]

[Effect of the device]

 As described above, according to the present invention, it is possible to provide a multicolor light emitting type semiconductor light emitting device capable of satisfactorily recognizing mixed colors in a wide angle range.

[Brief description of drawings]

FIG. 1 is a plan view showing a light emitting diode according to a first embodiment of the present invention.

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

3 is a plan view showing an arrangement of the light emitting diode chip of FIG. 1. FIG.

FIG. 4 is a circuit diagram showing a connection of light emitting diode chips.

FIG. 5 is a plan view showing an arrangement of a light emitting diode chip according to a second embodiment of the present invention.

FIG. 6 is a plan view showing an arrangement of light emitting diode chips of a third embodiment.

FIG. 7 is a plan view showing an arrangement of light emitting diode chips of a modified example.

FIG. 8 is a plan view showing an arrangement of light emitting diode chips of a modified example.

FIG. 9 is a plan view showing an arrangement of a conventional light emitting diode chip.

FIG. 10 is a plan view showing another arrangement of a conventional light emitting diode chip.

[Explanation of symbols]

 13 red light emitting diode chips 14a, 14b green light emitting diode chips 15a, 15b blue light emitting diode chips

Claims (3)

[Scope of utility model registration request] 1. A light emitting element of a first color is arranged at the center of a virtual polygon, and light emitting elements of second and third colors are alternately arranged at the vertices of the virtual polygon. A semiconductor light emitting device, wherein the light emitting elements of the first, second and third colors are configured to emit light at the same time. 2. A light emitting element is arranged at each apex of the virtual polygon, and light is emitted also at a point outside the virtual polygon and substantially equidistant from two adjacent apexes of the virtual polygon. Light-emitting elements at respective vertices of a plurality of triangles formed by connecting two adjacent vertices of the polygon and the equidistant points in order are arranged in the first, second and A semiconductor light emitting device which is a light emitting element of a third color and is configured to emit light at the same time. 3. A light emitting element is arranged at the center of the virtual polygon, and the light emitting element at the center is a light emitting element of the same color as the light emitting elements at the equidistant points. The semiconductor light emitting device according to claim 2.