KR20010064820A - Led lamp of side surface light emitting type - Google Patents

Abstract

PURPOSE: To provide a side emitting LED lamp having uniform directivity, small deviation between LED elements and reduced in size. CONSTITUTION: This side emitting LED lamp 1 comprises a red LED element 5R, a green LED element 5G and blue LED element 5b arranged in one row in a direction perpendicular to the end 2c on a board 2 for loading LED elements. In this case, the elements 5R, 5G and 5B are sealed with a convex lens 7.

Description

Side-emitting L.D.D. Lamp {LED LAMP OF SIDE SURFACE LIGHT EMITTING TYPE}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a side emitting type LED lamp suitable for a backlight of a liquid crystal display in, for example, a mobile phone, and more particularly, a side emitting type having uniform directivity, less misalignment between LED elements, and miniaturization. Relates to an LED lamp.

As a conventional side emitting type LED lamp, there is one disclosed in Japanese Patent Laid-Open No. 10-290029, for example.

Fig. 8 shows such a side emitting type LED lamp. This LED lamp 1 mounts the 1st LED element 5a and the 2nd LED element 5b on the LED element mounting board | substrate 2, as shown in FIG. 8A of the same figure, and these LED elements ( 5a and 5b are sealed with transparent mold resin 17. The common electrode 3c is formed in the front surface 2a and the back surface 2b of the board | substrate 2 for LED element mounting, respectively, and the 1st individual electrode 3a is formed in one side surface 2d of the board | substrate 2, respectively. On the other side 2b, second individual electrodes 3b are formed, respectively, and through-hole plating is half of the common electrode 3c on the surface 2a and the common electrode 3c on the back surface 2b. It is connected by connection plating 4 'cut | disconnected and divided into parts. The first and second LED elements 5a and 5b have a first electrode on the upper surface and a second electrode on the lower surface. The first electrode of the first LED element 5a is connected to the first individual electrode 3a by the bonding wire 6, and the first electrode of the second LED element 5b is connected by the bonding wire 6. It is connected to the 2nd individual electrode 3b, and the 2nd electrode of the 1st and 2nd LED element 5a, 5b is connected to the common electrode 3c of the surface 2a by the conductive adhesive.

When mounting this LED lamp 2 to the printed board 10, as shown in FIG. 8B, one end surface 2c of the board | substrate 2 for LED element mounting is faced down, and is mounted on the printed board 10. FIG. And corresponding wiring patterns 11a, 11b, and 11c on the individual electrodes 3a and 3b and the common electrode 3c and the printed board 10 that are exposed on the back surface 2b of the LED element mounting substrate 2. ) Is connected by solder 12. By flowing a current between the wiring patterns 11a, 11b and 11c, the light 8a and 8b of the first and second colors are transferred from the first and second LED elements 5a and 5b via the mold resin 17 to each other. It exits parallel to the surface of the printed board 10.

9 shows the directivity in the horizontal direction. As shown in the same figure, since it has the same directivity characteristic with respect to the two LED elements 5a and 5b, when using as a backlight of a liquid crystal display, a spot can be prevented in a liquid crystal display.

However, according to the conventional side-emitting type LED lamp, since the mold resin 17 has a rectangular shape, as shown in Fig. 9, the directivity is greatly changed by its corners, so that light is emitted to the liquid crystal display. Irradiation cannot be uniform.

Moreover, since the connection plating 4 'which connects the common electrode 3c of the front surface 2a and the back surface 2b of the board | substrate 2 is provided in the parallel direction of LED element 5a, 5b, a printed board In the case of mounting on (10), the height dimension becomes large, and since the individual electrodes 3a and 3b are provided on the side surface 2d of the substrate 2, the width dimension becomes large. Thus, in the structure which has an electrode in a circumferential end surface, when mounting three or more LED elements, an electrode structure becomes complicated and becomes large.

On the other hand, it is also possible to reduce the height dimension by arranging the two LED elements 5a and 5b as viewed from the light emitting side, but staining occurs on the liquid crystal display because the directivity in the horizontal direction is different between the colors.

Accordingly, it is an object of the present invention to provide a side-emitting type LED lamp having a uniform directivity and little deviation between LED elements.

In addition, another object of the present invention is to provide a side-emitting type LED lamp aimed at miniaturization.

1A is a perspective view of a side-emitting LED lamp according to a first embodiment of the present invention, seen from the surface side thereof,

1B is a perspective view of the side emitting type LED lamp viewed from the back side;

2 is a diagram showing the circuit configuration of a side emitting type LED lamp according to a first embodiment;

3A is a plan view showing a plurality of manufacturing substrates according to the first embodiment,

3B is a recessed surface view,

3C is a back view of the main portion projected from the surface side;

4A is a diagram showing the directivity characteristic in the horizontal direction of the side-emitting LED lamp of the first embodiment,

4B is a view showing the directivity characteristic of the resin direction of this side-emitting LED lamp;

5A is a perspective view of the mounting state of the side-emitting LED lamp of the first embodiment as seen from the front,

5B is a perspective view of the mounting state of the side-emitting LED lamp viewed from the rear;

6 is a view showing a side emitting type LED lamp and a directivity characteristic in a horizontal direction thereof according to a second embodiment of the present invention;

7 is a side view showing a side emitting type LED lamp according to a third embodiment of the present invention;

8A is a perspective view of a conventional side-emitting LED lamp viewed from the surface side,

8B is a perspective view showing a mounting state of the side-emitting LED lamp;

9 is a view showing the directivity characteristics in the horizontal direction of a conventional side-emitting type LED lamp.

Explanation of symbols on the main parts of the drawings

1: Side emitting type LED lamp 2: Board for LED element mounting

2a: surface 2b: back side

2c: one side 2d: side

2e: top surface 3B: blue electrode

3C: common electrode 3G: green electrode

3R: red electrode 3a: first individual electrode

3b: second individual electrode 3c: common electrode

4: through-hole plating 4 ': connection plating

5B: Blue LED Device 5G: Green LED Device

5R: red LED element 5a: first LED element

5b: second LED element 6: bonding wire

7: convex lens 8B: blue light

8G: Green System Light 8R: Red System Light

8a: light of the first color 8b: light of the second color

10: printed circuit board 11: wiring pattern

12: solder 17: mold resin

15C: Common terminal 15G, 15R, 15B: Terminal

20: substrate for manufacturing a plurality 21: substrate portion

The present invention, in order to achieve the above object, a plurality of LED elements arranged in the form of a column on the surface of the substrate, extending in the column direction of the plurality of LED elements are commonly installed in the plurality of LED elements, Provided is a side emitting type LED lamp comprising a convex lens for shaping and emitting the emitted light of a plurality of LED elements into light having a predetermined spreading angle.

According to the above configuration, by disposing a plurality of LED elements in a column form, the deviation of the directivity characteristics between the LED elements is reduced. In addition, uniform directional characteristics are obtained by shaping the emitted light of a plurality of LED elements into light having a predetermined spreading angle with a convex lens and emitting the light.

In order to achieve the above object, the present invention provides a through-connecting substrate comprising an insulating member, a surface electrode formed on the surface of the substrate, a back electrode formed on the rear surface of the substrate, and the surface electrode and the back electrode. Provided is a side-emitting LED lamp comprising hole plating and a plurality of LED elements connected to the surface electrodes.

According to the above configuration, by connecting the surface electrode and the back electrode by through-hole plating, the size is smaller than that of the connection between the surface electrode and the back electrode by metal provided on the side surface of the substrate.

(Example)

1A and 1B show a side emitting type LED lamp according to a first embodiment of the present invention. This side-emitting type LED lamp 1 is arranged in a line in a direction orthogonal to one end surface 2c on the LED element mounting substrate 2 and the surface 2a of the LED element mounting substrate 2. The red LED element 5R, the green LED element 5g, and the blue LED element 5B, and the LED element 5R, 5G, 5B, and the LED element 5R, 5G, 5B. It has a convex lens (shown as a tangent in the same figure 1A) 7 which emits emitted light by shaping it into light having a predetermined spreading angle.

The LED element mounting substrate 2 is made of a material having high heat resistance, for example, glass epoxy resin, alumina, or the like, and the common electrode 3C, red electrode 3R, and green electrode are formed on the surface 2a. 3G and a blue electrode 3B are formed, and on the rear surface 2b thereof, through-hole plating 4 is applied to the red electrode 3R, the green electrode 3G, and the blue electrode 3B. Connected blue electrode 3R, green electrode 3G and blue electrode 3B are formed, common electrode 3C on surface 2a and green electrode 3G on back surface 2b. The red electrode 3R and the blue electrode 3B extend to the edge of one end surface 2c in order to facilitate mounting on the printed board. In the LED mounting substrate 2, it is preferable that the surface 2a has a high light reflectance with respect to the entire emission wavelength of each LED element 5R, 5G, 5B, for example, a white one. Do. As a result, the luminous efficiency is increased, so that the power consumption can be reduced. At this time, 2e represents an upper surface of the substrate 2, and 2d represents a side surface of the substrate 2, respectively.

The red LED element 5R emits red light having a main emission wavelength of about 600 to 700 nm. For example, the red LED element 5R is formed of an InGaAlP (indium gallium aluminum phosphorus) semiconductor. The first electrode and the lower surface are provided with a second electrode. In the red LED element 5R, the first electrode on the upper surface is electrically connected to the red electrode 3R by the bonding wire 6, and the second electrode on the lower surface is electrically connected to the common electrode 3C by the conductive adhesive. And mechanically connected.

The green LED element 5G emits green light having a main emission wavelength of about 510 to 580 nm. The green LED element 5G is made of, for example, a GaN (gallium nitride) semiconductor element, and has a first electrode on the upper surface thereof. And a second electrode. In the green LED element 5G, the lower surface is mechanically connected to the common electrode 3C by an adhesive, the first electrode is electrically connected to the green electrode 3G by the bonding wire 6, and the second The electrode is electrically connected to the common electrode 3C by the bonding wire 6.

The blue LED element 5B emits blue light having a main emission wavelength of about 420 to 505 nm. The blue LED element 5B is made of, for example, a GaN (gallium nitride) semiconductor, and has a first electrode on the upper surface thereof. A second electrode is provided. The blue LED element 5B has a lower surface mechanically connected to the common electrode 3C by an adhesive, and the first electrode is electrically connected to the blue electrode 3B by the bonding wire 6. The two electrodes are electrically connected to the common electrode 3C by the bonding wires 6.

The convex lens 7 has a semi-circular shape composed of a transparent epoxy resin or a semi-transparent epoxy resin in which a filler having a light scattering effect or the like is blended. 5R, 5G, and 5B) have the same directivity. In addition, the convex lens 7 has a focus behind the light emitting surface of each LED element 5R, 5G, 5B. As a result, it is possible to diffuse and emit the light emitted from each of the LED elements 5R, 5G, and 5B. At this time, when light of a narrow angle is required, what has the focus of the convex lens 7 in front of the light emitting surface of each LED element 5R, 5G, 5B may be used.

2 shows a circuit configuration. As shown in the same figure, this LED lamp 1 has a four-terminal configuration in which one end of each of the LED elements 5R, 5G, and 5B is a common terminal. That is, the anode of each LED element 5R, 5G, 5B is connected to common terminal 15C, and the cathode of each LED element 5R, 5G, 5B is connected to terminal 15G, 15R, 15B, respectively. . By emitting each LED element 5R, 5G, 5B at the same time, individually, or in combination of the two, seven kinds of colors can be emitted.

Next, the manufacturing method of the LED lamp 1 is demonstrated with reference to drawings.

3A, 3B and 3C show a plurality of substrates for production. First, as illustrated in FIG. 3A, a plurality of production substrates 20 for manufacturing a plurality of LED device mounting substrates 2 are manufactured. The plurality of production substrates 20 includes m elements (for example, 42) in the longitudinal direction and n elements (for example, 15) in total in the lateral direction, mxn LEDs (for example, 630) in total. It has a board | substrate part 21 used as the board | substrate 2 for mounting, and one board | substrate part 21 has a magnitude | size of 3.65x2.15mm, for example, as a whole several board | substrate 20 for manufacture, for example For example, it has a size of 68x101 mm. As shown in FIG. 3B, the common electrode 3C, the red electrode 3R, the green electrode 3G, and the blue electrode (on the surface 2a of each substrate portion 21 of the substrate 20) 3B is formed, and the red electrode 3R, the green electrode 3G, and the blue electrode 3B are formed on the back surface 2b of each substrate portion 21, as shown in FIG. 3C. The red electrode 3R, the green electrode 3G, and the blue electrode 3B on the front and rear surfaces of the substrate portions 21 are connected to each other by the through hole plating 4. Next, each LED element 5R, 5G, 5B is mounted on each board | substrate part 21 as shown in 1, and each LED element 5R, 5G, 5B etc. is mounted by printing or a transfer mold etc. method. After sealing with the convex lens 7, each board | substrate part 21 is cut | disconnected and the mxn LED lamp 1 is manufactured.

4A and 4B show directivity characteristics. As shown in Fig. 4A, the LED lamp 1 widens the directivity angle (half-angle angle) θ by 140 degrees by the characteristic of the convex lens 7 in the horizontal direction characteristic. In addition, as the directivity characteristic in the vertical direction, a slight change is seen by the influence of the edge portion 7a of the convex lens 7 as shown in Fig. 4B of the same drawing.

5A and 5B show a state in which the LED lamp 1 of the present invention is mounted on a printed board. The one end surface 2c of the substrate 2 is placed down on the printed substrate 10, and the common electrode 3C and the common electrode line 11C, the green electrode 3G and the green electrode line 11G, The red electrode 3R, the red electrode line 11R, the blue electrode 3B, and the blue electrode line 11B are connected by solder 12, respectively. Thereby, electrode lines 11C, 11G, 11R. By passing a current between 11Bs, green light 8G, red light 8R, and blue light 8B pass through the convex lens 7 from the respective LED elements 5R, 5G, and 5B. It exits parallel to the surface of the printed board 10.

According to the LED lamp 1 of the first embodiment described above, since the respective LED elements 5R, 5G, and 5B are arranged in a line in a direction orthogonal to one end surface 2c, the horizontal direction is directed between the LED elements. When there is little deviation of a characteristic and is used as a backlight of a liquid crystal display, a spot can be prevented in a liquid crystal display.

In addition, since the light emitted by the LED elements 5R, 5G, and 5B is shaped and emitted by the convex lens 7, uniform directing characteristics can be obtained.

In addition, since the convex lens 7 which focuses behind the light emitting surface of each LED element 5R, 5G, 5B is used, since light is emitted from a wide angle, when using it as a backlight of a liquid crystal display, The inside of the surface can be easily and uniformly diffused, and the entire liquid crystal display can be uniformly emitted.

Further, electrodes 3C, 3G, 3R, and 3B are formed on the surface 2a and the back surface 2b of the substrate 2, and the electrodes 3G, 3R, 3B on the surface 2a and the back surface 2b. Is connected by the through-hole plating 4, and the LED elements 5R, 5G, and 5B are arranged close to each other at a pitch of 0.5 mm so as to have an interval smaller than the needle size, so that the size and weight can be reduced. . For example, the size can be reduced to 3.5 mm in width, 2 mm in thickness, and 2 mm in height, and the weight can be reduced to 0.018 g.

In addition, by adjoining each of the LED elements 5R, 5G, and 5B, the color mixture becomes high, the height of the LED lamp 1 can be made low, and the light guide plate can be made thin.

In addition, since the LED elements 5R, 5G, and 5B which emit light of three primary colors of RGB are mounted, coloration of the display can be realized when used as a backlight of a liquid crystal display.

Moreover, since many board | substrates for manufacture 20 are used, LED lamps can be manufactured at a high productivity and relatively inexpensive.

Fig. 6 shows a side emitting type LED lamp according to a second embodiment of the present invention. In this second embodiment, the convex lens 7 has a substantially hemispherical shape. As a result, the directivity in the vertical direction is largely eliminated as shown in Fig. 4B.

7 shows a side emitting type LED lamp according to a third embodiment of the present invention. In this third embodiment, the edge 7a of the convex lens 7 is rounded. As a result, the directivity in the vertical direction can be equalized.

In this case, in the above-described embodiment, the case of using three LED elements has been described, but the present invention can be applied to the case of using two LED elements. In addition, in the above-described embodiment, a combination of the LED elements emitting red, green, and blue light is described. However, other wavelengths (including infrared rays and ultraviolet rays) such as 380 nm (purple) and 590 nm (yellow) are included. You may combine the LED element which emits the light of. In addition to the first and second electrodes on the upper surface, the first electrode on the upper surface, and the second electrode on the lower surface, the LED element may also be used having the first and second electrodes on the lower surface.

As described above, according to the side-emitting type LED lamp of the present invention, since the plurality of LED elements are arranged in the form of a column, deviations in the directivity characteristics between the LED elements are reduced, and light emission of the plurality of LED elements is achieved. Since light is shaped by the convex lens, uniform directing characteristics are obtained.

In addition, since the surface electrode and the back electrode are connected by through hole plating, miniaturization can be achieved.

Claims (9)

A plurality of LED elements arranged in the form of a column on the surface of the substrate, And a convex lens extending in a column direction of the plurality of LED elements and commonly installed in the plurality of LED elements, and configured to emit light emitted from the plurality of LED elements into light having a predetermined spreading angle. Side emitting type LED lamp. The method of claim 1, The convex lens has a semi-circular shape in the column direction, characterized in that the side-emitting type LED lamp. The method of claim 1, The convex lens is a side-emitting LED lamp, characterized in that having a hemispherical shape. The method of claim 1, The convex lens has a focus on the rear side than the light emitting surface of the plurality of LED elements, side-emitting type LED lamp. The method of claim 1, The plurality of LED elements is a side-emitting type LED lamp, characterized in that it comprises a first, a second non-LED third LED element for emitting light of different colors, respectively. The method of claim 5, The first LED device is a red LED device for emitting red light, The second LED device is a green LED device for emitting green light, The third LED device is a side-emitting type LED lamp, characterized in that the blue-based LED device that emits blue light. The method of claim 1, The substrate includes a surface electrode formed on the surface, a back electrode formed on the back surface opposite to the surface, and through hole plating for connecting the surface electrode and the back electrode, And said plurality of LED elements is connected to said surface electrode. A substrate made of an insulating member, A surface electrode formed on the surface of the substrate, A back electrode formed on the back surface of the substrate, Through hole plating for connecting the surface electrode and the back electrode, And a plurality of LED elements connected to the surface electrodes. The method of claim 8, The plurality of LED elements have a first electrode and a second electrode, The surface electrode includes a plurality of individual electrodes to which the first electrodes of the plurality of LED elements are connected, and a common electrode to which the second electrodes of the plurality of LED elements are connected, The back electrode includes a plurality of individual electrodes, And said through-hole plating connects said plurality of individual electrodes of said surface electrode and said plurality of individual electrodes of said back electrode.