JPH10173242A - All-color light-emitting diode lamp - Google Patents

Abstract

(57) [Abstract] [Problem] To uniformly distribute light of each color of red, green, and blue, improve light mixing, and increase on-axis brightness. SOLUTION: Three LED chips 11R, 11G, 11B respectively emitting red light, green light, and blue light.
A lead (lead frame) 12 electrically connected to each of the LED chips 11, an outer enclosure (resin mold) 15 that surrounds and protects and seals around the LED chips 11; It comprises three lenses 16 provided independently for each LED chip 11. The radiation light from each LED chip 11 is distributed uniformly and efficiently by the corresponding lens 16 in the same spread. In addition, by arranging the leads in a straight line and extending from the envelope, taping is enabled, and mounting by an automatic mounting machine can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an all-color light-emitting diode lamp (RGB lamp) having three light-emitting diode chips for emitting three primary colors of light, red, green and blue, respectively. In particular, the present invention relates to an all-color light emitting diode lamp having improved light distribution.

[0002]

2. Description of the Related Art Conventionally, a light emitting diode (hereinafter, simply referred to as "LED"), which is a small semiconductor light emitting element, is not only used as a pilot lamp or various indicators, but also as a light emitting diode.
A large number of these are arranged vertically and horizontally to form a dot matrix, which is also used as a display device for emitting and displaying characters, figures, and the like. In recent years, such display devices have been promoted from monochromatic to multicolor, and further to all colors including white (full color), while progress has been made from display of simple figures and the like to image display. Then, the application as a color television is also being studied.

[0003] Such a full-color (full-color) display device generally uses three types of single LED lamps that emit red, green, and blue light, which are the three primary colors of light, respectively, and a large number of these are dispersed and arranged. Formed. By selectively lighting the LED lamps of the respective colors, it is possible to perform light emission display of substantially all colors including white. However, the light emitting display surface formed of an array of a large number of single LED lamps formed in this way generally has a rough texture because the interval between each LED lamp or each LED chip is relatively wide.

On the other hand, with the recent improvement in the luminous efficiency of the blue LED chip, the blue LED chip is provided together with the red LED chip and the green LED chip to form a compact single LED lamp. All-color light emitting LED lamps (RGB lamp, three primary color lamps, full color LED lamps) are also known, for example, from JP-A-4-365382 and JP-A-5-251949. Specifically, this all-color light emitting LED lamp is formed in the same manner as a normal single-angle LED lamp except that it has these three LED chips and has a corresponding number of leads. Each of the LED chips is bonded to a lead frame as a lead and electrically connected thereto, and is sealed by a resin mold made of a transparent epoxy resin or the like. And, the resin mold as an outer enclosure that surrounds and protects and seals the LED chip is formed in a columnar shape, and together with a lens integrally provided at the tip,
The entire outer shape is formed in a shell shape.

[0005]

Incidentally, when such a full-color (full-color) display device comprising a matrix of LED lamps is applied particularly to a color television or the like, not only sufficient luminance but also display is obtained. It is important that the texture of the image is fine, that is, the resolution is good and the image is clear (clear). The characteristics such as the fineness of the displayed image are different from the use of a single lamp having one LED chip in combination with each color, as compared with the above-described all-color light emission provided by combining these three LED chips. Type LED
It can be obtained more easily by using a lamp.

However, the conventionally known all-color light emitting type L
When an ED lamp is used to actually form a display device, there is a tendency that sufficient color mixing and the like are not necessarily obtained. That is, the conventional bullet-shaped all-color LED lamp has a configuration in which each LED chip forming a point light source shares a single lens, and at least two LEs are used.
Since the D chip is necessarily disposed off the optical axis of the lens, the directions of the light distribution become non-uniform with each other, whereby the color mixture of white mixed colors is not sufficient, and There was a tendency for the emission color to differ depending on the viewing position (angle). Further, the dispersion of the light distribution is also a decrease in on-axis (front) brightness, which is not preferable.

Meanwhile, in a full-color light emitting LED lamp having three LED chips of red, green and blue, in order to control the lighting of each LED chip independently,
As the leads, six leads or at least four leads are required even when a common lead is used. However, even in the case of such an all-color light emitting LED lamp having a relatively large number of leads, it is desirable that the assembling to the display substrate can be automatically performed by an automatic mounting machine when the display device is manufactured. And for that purpose, "taping" is used as a supply method during automatic mounting.
Is advantageously applicable. That is, if the supply method by taping is possible, the automatic mounting is facilitated thereby, the assembly cost is reduced, and the display device can be mass-produced.

Accordingly, the present invention can uniformly distribute red, green, and blue light, thereby improving color mixing and eliminating color differences depending on the viewing direction (angle). Further, it is a first object of the present invention to provide an all-color LED lamp capable of increasing the on-axis (front) brightness.

A second object of the present invention is to provide, in addition to the first object, an all-color LED lamp capable of easily performing automatic mounting.

[0010]

The first object of the present invention is to basically provide a lens for distributing light emitted from an LED chip to each LED chip independently. This can be solved by providing.

That is, the all-color light emitting LED according to claim 1
The lamp is composed of three LED chips including a red LED chip emitting red light, a green LED chip emitting green light, and a blue LED chip emitting blue light, and each of the three LED chips is electrically connected to the lamp. A plurality of leads which are electrically connected to each other, an outer enclosure which surrounds, protects and seals around the three LED chips, and
And three lenses respectively corresponding to the LED chips and provided independently of each other.

Therefore, the three lenses are provided independently of each other, that is, in correspondence with the three LED chips of red, green, and blue, that is, in correspondence with the optical axis. The emitted light of each color emitted from is efficiently distributed in the same spread by the corresponding lens. For this reason, the color mixing property is improved, the color difference depending on the viewing direction (angle) is eliminated, and the on-axis (front) brightness is increased.

Further, the above-mentioned second object of the present invention can be basically solved by arranging a plurality of leads extending from the bottom of the envelope in a line in a plane. .

That is, an all-color light emitting LED according to claim 2
The lamp according to claim 1, wherein the plurality of leads extend in a straight line from the bottom of the envelope.

[0015] Therefore, since a relatively large number of leads are arranged in a plane, taping for automatic mounting is possible. That is, the leads arranged in a plane are placed between the adhesive tape and the tape mount. To a taping component, which can be supplied to an automatic mounting machine. Therefore, the automatic mounting can be easily performed, thereby reducing the assembling cost and producing a large number of display devices at low processing cost.

[0016]

Embodiments of the present invention will be described below.

[First Embodiment] FIGS. 1 to 4 show an all-color light emitting LED lamp according to a first embodiment of the present invention. FIG. FIG. 2 is a perspective view, and FIG. 2 is a plan view showing the all-color LED lamp as viewed from above (front). FIGS. 3 and 4 are cross-sectional views showing the all-color light emitting LED lamp by cutting along the AA cutting line and the BB cutting line in FIG. 2, respectively.

As shown in FIGS. 1 to 4, an LED (light emitting diode) lamp according to the present embodiment, which is indicated as a whole, has three LED chips made of a pn-junction optical semiconductor crystal as light emitting elements. 11, that is, a red LE that emits three primary colors of light, red light, green light, and blue light, respectively.
It is formed to include a D chip 11R, a green LED chip 11G, and a blue LED chip 11B that emits blue light. Therefore, this LED lamp 10 is “RG
B lamps ”and the like, and are formed as full-color light emitting LED lamps.
By selectively operating the G and 11B individually or by combining two or all of them, not only red, green and blue but also substantially all colors including a mixture of these colors and white can be obtained. Emit light.

The red LED chip 11R of the LED chips 11 of each color can be formed of, for example, gallium aluminum arsenide (GaAlAs). The green LED chip 11G is, for example, a relatively high luminous intensity can be obtained a group III nitride semiconductor _{(In x1 Al y1 Ga 1-} x1-y1 N, where, 0 ≦ x1, y1 ≦
From 1), the blue LED chip 11B further includes, for example,
Similar III nitride semiconductor can be obtained relatively high intensity _{(In x2 Al y2 Ga 1-} x2-y2 N, where, 0 ≦ x2, y
From 2 ≦ 1), they can be formed.

More specifically, the all-color light emitting type L of this embodiment
The ED lamp 10 is formed as a resin-sealed lead frame type, and includes red, green, and blue LED chips 11R, 1R.
1G and 11B are supported and electrically connected to a lead frame 12 which forms an external lead also serving as a frame. That is, as shown particularly in FIG. 3, the lead frame 12 is composed of a pair of a main lead frame 12a and a sub lead frame 12b which form either a cathode or an anode, respectively.
1R, 11G and 11B are the main lead frames 12
a is fixed by means of die bonding in a reflection plate (mirror) 13 formed at the tip of a, and the front surface electrode is electrically connected to the back surface electrode via a gold wire 14. By,
It is electrically connected to the sub lead frame 12b.
However, the blue LED chip 11B and the green LED chip 1
Since 1G has both electrodes on the front side, it is electrically connected to the main lead frame 12a by the gold wire 14. It should be noted that which one of the main lead frame 12a for die bonding of the LED chip 11 and the sub lead frame 12b for wire bonding is to be used as a cathode or an anode is determined by each LED chip 11.
Based on the junction structure of R, 11G, and 11B, it is determined that a forward current flows through them.

The LED chips 11 for each color are
R, 11G, and 11B, and 6 connected to them, respectively.
The tip of the lead frame 12 is made of a light-transmissive resin, for example, a transparent epoxy resin, to protect and seal them, and has a draft angle but a substantially cylindrical resin mold. Covered by 15 and surrounded. Further, a substantially semi-elliptical sphere (a rugby ball-like elliptical sphere (a rotating elliptical sphere, a spindle) obtained by stretching a sphere along one axis) is formed on the tip end of the resin mold 15 to be approximately half or less. Cut lenses], each of which has a respective one of the LED chips 11R, 11G,
The LED chips 11 are formed integrally with each other, that is, with their optical axes substantially aligned with each other. The three lenses 16 are formed in the same shape, and have the same aperture and the same focal length. Therefore, the red, green, and blue radiated lights emitted from the LED chips 11R, 11G, and 11B pass through the light-transmissive resin mold 15, are distributed by the corresponding lenses 16, and are coextensive with each other. (Upper side in the figure). However, in the present embodiment, since the lenses 16 are formed in a substantially semi-elliptical shape, each of the radiated lights of red, green, and blue is transmitted to the lens 1.
The light is distributed on the side of the lengthened direction 6, that is, on the long axis side. The approximately semi-elliptical lenses 16 are arranged in the same direction, that is, with their major axes aligned so that the directions in which the spreads of the respective radiated lights are deviated coincide with each other.

Here, each of the LED chips 11R, 11G,
11B are arranged in a plane, that is, at the same height, and so as to be as close to each other as possible. In other words, when these are connected to each other as points,
The triangles having these vertices are arranged so as to be as close as possible to a regular triangle. However, this LED
The arrangement of the chips 11 and their mutual spacing are also based on the arrangement of the three lenses 16. That is, as shown in FIG. 2, each of the three lenses 16 composed of substantially semi-elliptical convex lenses has an elliptical shape in plan view, but one lens 1
One lens 16 on each side of the
Are circumscribed in parallel to the major axis and are shifted in the major axis direction. The arrangement is such that a circle formed by the cylindrical resin mold 15 in a plan view has three lenses 1 having the smallest possible diameter.
6 is inscribed. That is, the LED chips 11R, 11G, and 11B are arranged so that the distance between the LED chips 11R, 11G, and 11B is as equal as possible, while the cylindrical resin mold 15 can be formed with the smallest possible diameter. The three semi-ellipsoidal lenses 16 respectively corresponding to the chip 11 are arranged so that when they are arranged in parallel, the circles inscribed therein have the smallest possible diameter.

In this embodiment, a pair of lead frames 1 corresponding to each LED chip 11 composed of a main lead frame 12a and a sub lead frame 12b.
Numerals 2 are arranged in parallel along the long axis direction of each lens 16 and extend from the bottom of the resin mold 15 as it is. The arrangement of the six lead frames 12 is the most preferable in that the lead ends are distributed in a well-balanced manner. However, other appropriate arrangements may be made according to the specific shape of the lead frame 12 itself. It can also be. The arrangement of the LED chips 11 corresponding to the three lenses 16 arranged in parallel is centered on the red LED chip 11R here, but may be in any other appropriate order.

As described above, the all-color light emitting LED lamp 10 according to the first embodiment includes a red LED chip 11R and a green LED chip which respectively emit red, green and blue light, which are the three primary colors of light. 11G and blue LED chips 11B, and six lead frames 1 as leads electrically connected to the three color LED chips 11R, 11G, and 11B.
2, a resin mold 15 which surrounds and protects and seals around the three LED chips 11, and is formed integrally with the resin mold 15 to form an LE.
A lens 16 composed of a substantially elliptical convex lens for distributing light emitted from the D chip 11 is basically provided, and the lens 16 is provided with each of the LED chips 11R, 11G, 11
B is provided independently for each of three.

Therefore, according to the all-color light emitting type LED lamp 10, since it has three LED chips 11 which respectively emit red, green and blue light which are three primary colors of light, a compact single light emitting LED lamp 10 is provided. By selectively lighting these LED chips 11 while having the shape of an LED lamp, substantially all colors including a mixed color of white by simultaneous lighting can be emitted. Therefore, this L
The ED lamp 10 can also be used as a pilot lamp or various indicators, but can be used particularly advantageously to arrange a large number of units to form a display panel or a display device such as a color television. A bright (high resolution) light-emitting display surface can be formed with luminance.

Particularly, in this all-color light emitting LED lamp 10, since three lenses 16 are provided independently corresponding to each of the LED chips 11R, 11G, and 11B, these LED chips are provided. 11R, 11
The red light, the green light, and the blue light emitted from the G and 11B can be independently distributed in the same spread by the lenses 16. Therefore, since the light distribution of each color is uniform, the color mixing property is improved, and the difference in emission color depending on the viewing position (direction) is prevented. In addition, compared to the conventional case in which light is distributed by a single lens, the light emitted from each LED chip can be more efficiently distributed, so that the on-axis (front) brightness can be further increased. Can be.

Also, the all-color light emitting type L of the first embodiment is described.
In the ED lamp 10, three lenses 16 corresponding to each LED chip 11 are formed in a substantially semi-ellipsoidal shape, and are arranged in parallel with their long axes aligned in the same direction. Therefore, the red color from the LED chip 11
Since the green and blue emitted lights are spread by the lenses 16 in the direction of their long axes and distributed, by arranging the LED lamps 10 in the same direction, a display having a wide angle in that direction is provided. The device can be configured.

However, this lens 16 consisting of a convex lens
The shape of is not only a semi-ellipsoid (semi-fusiform) whose planar view is an ellipse as described above, but also, for example, a substantially hemispherical shape whose planar view is a perfect circle as in the following embodiment. It can also be shaped. And in this case, the LED chip 11R,
The arrangement of 11G and 11B can be appropriately arranged within a range in which the three hemispherical lenses can be independently formed corresponding to them, but it is most preferable to arrange them in a regular triangular shape with an equal interval between them. Also, it is most preferable that these three lenses be arranged so as to circumscribe each other. As a result, it is possible to obtain an all-color light-emitting LED lamp with uniform light distribution in any direction, no directionality, and the best color mixing. Further, the lens 16 may have a pyramid shape such as a triangular pyramid, or a polyhedral shape such as a turtle shell. Thereby, various interesting light distributions can be obtained.

In the present embodiment, the linear 6
The lead frames 12 are directly extended from the bottom of the resin mold 15.
By bending the intermediate member 2 in the middle, it is also possible to extend the resin mold 15 from the lower portion of the resin mold 15 as an outer envelope in a state of being linearly and planarly aligned. And by doing so, it becomes possible to supply by taping when automatic mounting is performed by an automatic mounting machine,
The display device can be efficiently produced in large quantities, and the assembly cost and the processing cost can be reduced. However, in practice, it is difficult to align as many as six lead frames in a straight line because the LED lamp 10 itself is formed compactly, and the manufacturing cost is relatively increased. Therefore, when the lead frames are aligned in a straight line to enable taping, the number of lead frames may be reduced to four using a common lead frame as in the following second embodiment. preferable.

[Second Embodiment] FIGS. 5 to 7 show an all-color light emitting LED lamp according to a second embodiment of the present invention. FIG. 5 shows the all-color light emitting LED lamp. 6 is a cross-sectional view taken along the line CC of FIG. 5, and FIG. 7 is viewed from the right side of FIG. 5, that is, is orthogonal to the line CC. It is the side view seen from the direction. In these drawings, the same or corresponding components as those of the all-color light emitting LED lamp 10 of the first embodiment shown in FIGS. Omitted.

As shown in FIGS. 5 to 7, the all-color LED lamp of the second embodiment, which is indicated as a whole by 20, is formed as a lead frame type similarly to the first embodiment. However, the lead frame is composed of four lead frames: a main lead frame (individual main lead frame) individual to each LED chip, and a common sub lead frame (common sub lead frame). Here, the lens made of a convex lens is formed in a substantially hemispherical shape, which is the shape of a normal convex lens.

That is, the all-color light emitting LED lamp 20 of the present embodiment includes a red LED chip 11R, a green LED chip 11G, and a blue LED chip 11B as in the first embodiment, and these are circular. Columnar resin mold 15
And three lenses 16 each formed of a substantially hemispherical convex lens corresponding to each of the LED chips 11 are integrally formed at the upper end of the resin mold 15. Have been.

As shown in FIGS. 6 and 7, in particular, each of the LED chips 11 is connected to the reflection plate 1 of the main lead frame 22a serving as either a cathode or an anode.
3 and one side of the electrode is electrically connected to it directly or via a gold wire 14. This point is the same as that of the first embodiment, except that the subframe forming the other of the cathode and the anode is formed as a single common sublead frame 22b, and the other electrode of each LED chip 11 is connected to this frame. 22b are connected together via the gold wire 14. Therefore, a total of four lead frames 22 are provided.

Here, red, green, and blue LEDs
The chips 11R, 11G, and 11B are arranged planarly, that is, at the same height, and at equal intervals. In other words, when these are connected to each other as points,
They are arranged so that an equilateral triangle having these as vertices is formed. In addition, the interval between them is the minimum interval between the corresponding substantially hemispherical lenses 16 circumscribing each other. That is, as shown in FIG. 5, the three lenses 16 form circumscribed circles circumscribing each other in a plan view, and the LED chips 11R, 11G, and 11B are arranged at their centers (optical axes). Then, the cylindrical resin mold 15 has a minimum diameter, that is, those three in a plan view.
The shape is an inscribed circle surrounding the lenses 16.

In the present embodiment, the four lead frames 22 are attached from the bottom of the resin mold 15.
It extends in a straight line about its diameter, that is, in a line in a plane, and extends downward (in a direction opposite to the direction of light emission). Specifically, the common sub-lead frame 22b formed in a single straight line as usual has three LEs.
The three main lead frames 22a, which are positioned slightly offset from the center of the arrangement of the equilateral triangle formed by the D chips 11 (FIG. 5) and each LED chip 11 is bonded to the tip, are shown in FIGS. As shown in FIG.
It is bent in the resin mold 15 so that the lower portion is positioned in a plane on the diameter including the common sub-lead frame 22b, and is arranged substantially evenly in the plane. That is, in the plan view of FIG. 5, the three main lead frames 22a and the common sub-lead frames 22b are arranged such that lower portions (not shown) are arranged at substantially constant intervals on the left-right diameter of the resin mold 15. ing.

As described above, the all-color light emitting LED lamp 20 according to the second embodiment includes a red LED chip 11R and a green LED chip which respectively emit red, green, and blue light, which are the three primary colors of light. 11G and three LED chips 11 including a blue LED chip 11B, and a lead frame 22 as a lead electrically connected to the three LED chips 11R, 11G, and 11B.
A resin mold 15 as an outer enclosure that surrounds and protects and seals around these three LED chips 11.
And a lens 16 formed of a substantially hemispherical convex lens that is formed integrally with the resin mold 15 and distributes the light emitted from the LED chip 11.
Are independently provided for each of the LED chips 11R, 11G, and 11B. More specifically, the lead frame 22 includes three main lead frames 22a to which the respective LED chips 11 are bonded, and a single common sub-lead frame 22b common to the respective LED chips 11. I have.

Therefore, according to the all-color LED lamp 20, since the three lenses 16 are provided independently in correspondence with the respective LED chips 11R, 11G and 11B, these LEDs 16 are provided. Chip 11R, 1
The red light, the green light, and the blue light emitted from 1G and 11B can be independently distributed in the same spread by the lenses 16. Therefore, similarly to the first embodiment, there is an effect that the color mixing property is improved, the difference in the emission color depending on the viewing position is eliminated, and the on-axis (front) brightness can be further increased.

In the present embodiment, in particular,
Red, green, and blue LED chips 11R, 11G, 11B
Are arranged at regular intervals in an equilateral triangular shape, and three hemispherical lenses 16 corresponding to these are formed circumscribing each other. Therefore, an all-color LED lamp having the best color mixing can be obtained, and the LED lamp can be formed most compactly.

Further, in the all-color light emitting LED lamp 20 of the present embodiment, four lead frames 22 as external leads are arranged in a straight line and in a planar manner.
It extends from the bottom of the resin mold 15 as an outer enclosure. Therefore, when a display device is manufactured by assembling a large number of the LED lamps 20 on a mounting substrate using an automatic mounting machine, taping can be applied as a supply unit. That is, as in the case of a normal single LED lamp, the aligned lead frame 22 can be attached to an adhesive tape to form a taping component, and supplied to an automatic mounting machine in that form. Therefore, automatic mounting by an automatic mounting machine is possible, so that a large number of display devices can be efficiently produced, and assembling costs and processing costs can be reduced. In addition, since the LED lamps 20 can be optimally arranged by such automatic mounting, a high-quality display device having a good balance between color mixture and brightness can be formed.

In the above-described embodiment, in order to align the four lead frames 22 in a straight line, specifically, each main lead frame 22a is bent by a predetermined amount to form a common sub-lead frame 22b. Are located in the plane on the diameter including However, in this type of embodiment, the means for aligning the lead frames 22 in a straight line may be any other suitable means, for example, by bending all four lead frames 22 in the resin mold 15, They can also be aligned in an appropriate plane. The pitch of the lead frames 22 to be aligned is desirably constant in terms of mounting, and the pitch value (mm)
Is preferably 2.54, 1.76, or 1.27. However, this pitch is not necessarily required to be constant in view of the relationship between the arrangement of the LED chip 11 and the lead frame 22, and the value is not limited.

In this embodiment, the three lenses 16 have not only a substantially hemispherical circular shape in plan view but also other shapes, for example, elliptical shape in plan view as in the first embodiment. The shape may be a substantially semi-elliptical spherical shape.
Also, the three LED chips 11R, 11G, 11B are:
In addition to the regular triangular arrangement, the three lenses 16 can be appropriately arranged as long as they can be independently formed corresponding to them. Then, the arrangement of the common sub lead frame 22b can be appropriately determined in accordance with them.

Third Embodiment FIGS. 8 and 9 show an all-color light emitting LED lamp according to a third embodiment of the present invention. FIG. 8 shows the all-color light emitting LED lamp. FIG. 9 is a plan view as viewed from above, and FIG. 9 is a cross-sectional view taken along line DD in FIG. In these figures, FIG.
The same or corresponding components as those of the all-color light emitting LED lamps 10 and 20 of the first and second embodiments shown in FIG. 7 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 8 and 9, the all-color LED lamp according to the third embodiment, which is designated by the reference numeral 30 in its entirety, is configured as a so-called "parabolic type".
The ED chip 11R, the green LED chip 11G, and the blue LED chip 11B are all bonded to a relatively large parabolic reflector plate 31. More specifically, in the present embodiment, the reflecting dish 31 is formed in an elongated elliptical shape, and the three LED chips 11 are
The reflectors 31 are arranged in a row in the elongated reflector 31 at substantially equal intervals along the length direction thereof.

Accordingly, as shown in FIG. 9, the lead frame 32 serving as a lead forms one of a cathode and an anode, and has a parabolic reflection plate 3 at its tip.
The LED chip 11 is composed of a common main lead frame 32a forming a single lead frame on which 1 is formed, and three sub lead frames 32b forming the other of the cathode and the anode and being individual for each LED chip 11. And each L
In the ED chips 11R, 11G, and 11B, one side electrode is electrically connected to the reflection plate 31 of the common main lead frame 32a directly or via the gold wire 14, and the other side electrode is connected to each sub lead frame 32b. Are electrically connected via gold wires 14 so that their respective LED chips 11 can be turned on independently of each other. Further, the tip portions of the LED chip 11 and the lead frame 32 are sealed and protected by a resin mold 15 as an outer casing, as in the first and second embodiments. Although the resin mold 15 is formed in a substantially cylindrical shape, an annular locking portion 33 for vertical positioning is integrally formed at the lower end thereof, and a part thereof is formed. A flat notch 34 is provided for positioning in the circumferential direction.

Here, in the present embodiment, 3
Each sub lead frame 32b of the book is orthogonal to the length direction of the reflection plate 31 of the common main lead frame 32a,
It is arranged separately on both sides. Therefore, a total of four lead frames 32 as external leads are linearly aligned substantially on the diameter of the cylindrical resin mold 15 and extend from the bottom thereof.

In the same manner as in the first and second embodiments, three upper portions of the resin mold 15 are independently provided on the upper end of the resin mold 15 corresponding to the respective LED chips 11R, 11G, and 11B. The lens 16 is provided integrally. However, in the present embodiment in which the LED chips 11 are arranged in one row, these lenses 16 are formed in a substantially semi-elliptical spherical shape similar to the first embodiment, the top view being an elliptical shape. , And are arranged in parallel with the short axis sides in contact with each other. That is, the three lenses 16 are LEDs
The chips 11 are arranged in a stacked form with their long axes directed in a direction orthogonal to the rows of the chips 11. Therefore, the emission light of each color from each LED chip 11 is transmitted to the lens
In this embodiment, since the lenses 16 are semi-ellipsoidal, the light distribution is more distributed with respect to the major axis direction of the lenses 16. It will be greatly expanded.

As described above, the all-color LED lamp 30 of the third embodiment is different from the specific mode of the lead frame 32 and the specific mode of the arrangement of the LED chip 11 and the lens 16. However, as in the previous embodiments, the red LED chip 11R and the green LE respectively emit the three primary colors of light, red, green, and blue, respectively.
Three LED chips 11 each including a D chip 11G and a blue LED chip 11B, and these three color LEDs
A lead frame 32 serving as a lead electrically connected to the chips 11R, 11G, and 11B;
A resin mold 15 that surrounds and protects and seals the periphery of the ED chip 11, and three lenses 16 provided independently corresponding to each of the LED chips 11R, 11G, and 11B. Is provided.

Therefore, the effect of this all-color light emitting LED lamp 30 is the same as that of the previous embodiments,
The radiated light from the ED chip 11 is distributed by the corresponding lenses 16 so as to be aligned in the same spread, so that the color mixture is improved, and the difference in emission color depending on the viewing position is eliminated.
On-axis (front) brightness can be further increased.

In this embodiment, three lenses 1
Numeral 6 is formed in a semi-elliptical shape that is long in a direction orthogonal to the direction of the row, corresponding to the LED chips 11 arranged in a row. Therefore, as in the case of the first embodiment, a light distribution with a wide angle in the length direction can be obtained,
In addition, when all the LED chips 11 are turned on to emit white light which is a mixed color of them, a light distribution having a wider spread as a whole is obtained instead of a streak-like light distribution according to the row. In other words, the lens 16 can be formed in a substantially hemispherical shape having a circular shape in plan view as in the second embodiment. However, when the LED chips 11 are arranged in a row, As in the form, it is more preferable to form a substantially semi-elliptical sphere that is long in a direction perpendicular to the direction of the row. When the lens 16 is formed in a substantially hemispherical shape, it is preferable to arrange the LED chips 11 in a regular triangle or a triangle close thereto, as in the second embodiment. In this case, the parabolic reflector plate 3
1 is formed in such a substantially regular triangle, and each LED chip 11 is arranged near each corner thereof and bonded.

Further, in the all-color light emitting LED lamp 30 of the present embodiment, three sub-lead frames 32b are provided for the common main lead frame 32a having the elongated and elliptical parabolic reflector 31. Are arranged at right angles to the length direction of the reflection plate 31 and on both sides thereof. Therefore, the cylindrical resin mold 15 is
Since it can be formed with a diameter corresponding to the length of the reflection plate 31 or the height of the stack of three substantially semi-elliptical lenses 16 provided corresponding to the respective LED chips 11, the smallest diameter can be obtained. , And the LED lamp 30 as the all-color light emitting type can be formed most compactly.

At the same time, a total of the four lead frames 32 are connected to the resin mold 1 as an enclosure.
5 extend in a straight line from the bottom. Therefore, taping at the time of automatic mounting becomes possible, and it is possible to mass-produce a display device in which a large number of all-color light emitting LED lamps 30 are assembled, and to reduce the assembly cost and the processing cost.

Fourth Embodiment FIGS. 10 to 12 show an all-color light emitting LED lamp according to a fourth embodiment of the present invention. FIG. FIG. 11 is a plan view seen from above, and FIG.
FIG. 12 is a sectional view taken along the line E-E.
It is sectional drawing which followed the -F cutting line. In these drawings, the same reference numerals are used for the same or corresponding components as those of the first to third embodiments.

As shown in FIGS. 10 to 12, the all-color light emitting LED lamp of the third embodiment, which is indicated as a whole by 40, is formed as a reflection type (reflect type). That is, the all-color LED lamp 40 includes a base (stem) 41 formed of a heat-resistant hard resin or a ceramic material, and a lead frame 42 integrally joined on the surface of the base 41. 3 that emits red, green, and blue light on the lead frame 42.
The LED chips 11R, 11G, and 11B are arranged in an equilateral triangle at equal intervals.

More specifically, as shown particularly in FIG. 12, the lead frame 42 is a single common lead frame 42a having three terminals formed of a conductive thin plate.
And three individual lead frames 42b, the terminals of which are formed in grooves 41a (see FIG.
It extends downward through 1). Each of the terminal portions of these lead frames 42 as external leads is bent horizontally at the lower portion of the base 41 so that it can be surface-mounted on the LED mounting board. And each LED chip 11R, 11G, 11
B is bonded to each of the three individual lead frames 42b, one of the electrodes is connected thereto, and the other electrode is electrically connected to the common lead frame 42a via the gold wire 14. I have.

Also, the base 41 is inclined in a mortar shape on the base 41,
The reflector 43 having a white light-reflective inner surface has three LEs.
The D chips 11R, 11G, and 11B are integrally joined so as to surround the periphery thereof, and a resin mold 44 made of a light transmitting resin material such as an epoxy resin is potted in an inner space of the reflector 43. The LED chip 11 is sealed and protected. Note that the base 41 and the reflector 43 are formed in a substantially equilateral triangular cross-sectional shape corresponding to the arrangement of the three LED chips 11, and are thus constituted by the base 41, the reflector 43, and the resin mold 44. Here, the enclosed body is formed in a substantially equilateral triangular prism shape. That is, each LED chip 11 is disposed near each corner of the reflector 43 having a substantially equilateral triangular cross section, whereby the all-color LED lamp 40 is formed most compactly.

The lens 16 formed of a substantially hemispherical convex lens is integrally formed on the upper surface of the resin mold 44 so as to correspond to each of the LED chips 11R, 11G, and 11B. The arrangement of the three lenses 16 is the same as that of the second embodiment in FIG. 5, and the three lenses 16 which are circular in plan view are arranged so as to circumscribe each other. Therefore, the radiated light from each LED chip 11 passes through the resin mold 44, and a part thereof is reflected by the reflector 4.
3 is directed forward by being reflected by the wall surface of the third lens, and is efficiently and forwardly directed forward by the corresponding lenses 16 immediately above.
Light distribution is uniform.

As described above, the all-color light emitting LED lamp 40 of the fourth embodiment is embodied as a reflection type, but basically, the three primary colors of light, red, green, and Three LED chips 11 each including a red LED chip 11R, a green LED chip 11G, and a blue LED chip 11B that respectively emit blue light, and are electrically connected to these three color LED chips 11R, 11G, and 11B. A lead frame 42 as a lead,
A base 41 and a reflector 43 as a surrounding body for surrounding and protecting and sealing these three LED chips 11, a resin mold 44, and each LED chip 11
It has three lenses 16 provided independently corresponding to R, 11G, and 11B.

Therefore, the all-color LED lamp 4
According to 0, as in the first to third embodiments, the radiated light from each LED chip 11 is distributed efficiently and coextensively by the corresponding lens 16 because it is distributed. In addition, there is an effect that the color mixing property is improved, there is no difference in the emission color depending on the viewing position, and the on-axis (front) brightness is further increased.

In the above-described embodiment, the lead frame 42 is bent at the lower end of the base 41 to form a surface mount type LED.
Although the lamp is used, the lead frame 42 can be appropriately changed so as to extend downward from the bottom of the base 41 as the outer enclosure. In that case, by aligning the extending lead frames 42 in a straight line, taping during automatic mounting can be performed as described above.

The all-color light emitting LED lamp of the present invention can be embodied in various forms as described above. In addition, for example, a printed wiring board is used as a support base instead of a lead frame, and a red , Green and blue LED chips can be bonded and arranged, and the envelope can be formed as a hollow housing.
However, also in these cases, a lens for distributing the emitted light is provided independently for each LED chip.

[0061]

As described above, the all-color LED lamp according to claim 1 is a red LED chip emitting red light, a green LED chip emitting green light, and a blue LED chip emitting blue light. , And a plurality of leads electrically connected to each of the three LED chips, and protects and seals around these three LED chips. And an enclosure
Corresponding to each of those three LED chips, and
And three lenses provided independently of each other.

Therefore, according to this all-color light emitting LED lamp, since the lens is provided independently for each LED chip, each radiated light of red, green and blue from each LED chip is Light is distributed uniformly and efficiently by the corresponding lenses. Because the light distribution of each color is aligned, the viewing direction (angle)
As a result, the color of emitted light does not become non-uniform, the light-mixing properties of mixed colors including white are improved, and the on-axis (front) luminous intensity is increased, thereby giving the effect of making the image appear brighter.

An all-color light emitting LED according to claim 2
The lamp according to claim 1, wherein the plurality of leads extend in a straight line from the bottom of the envelope.

Therefore, according to this all-color light emitting LED lamp, since the plurality of leads extending from the bottom of the envelope are linearly aligned in a plane, the all-color light emitting LED can be used.
When an ED lamp is automatically mounted on a display substrate by an automatic mounting machine, taping as a supply method can be applied. Therefore, automatic mounting is facilitated, so that a large number of displays in which a large number of all-color light emitting LED lamps are assembled can be produced, and the processing cost can be reduced. In addition, since the mounting is easy, it is possible to optimally arrange the LED lamps, and there is an effect that the color mixture and the brightness are improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an all-color LED lamp according to a first embodiment of the present invention.

FIG. 2 is a plan view showing the all-color light emitting LED lamp of FIG. 1 as viewed from above (front).

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2;

FIG. 4 is a sectional view taken along the line BB of FIG. 2;

FIG. 5 is a plan view showing an all-color LED lamp according to a second embodiment of the present invention as viewed from above (front).

FIG. 6 is a sectional view taken along the line CC of FIG. 5;

FIG. 7 is a side view shown from the right side of FIG.

FIG. 8 is a plan view showing an all-color LED lamp according to a third embodiment of the present invention as viewed from above (front).

FIG. 9 is a sectional view taken along the line DD in FIG. 8;

FIG. 10 is a plan view showing an all-color LED lamp according to a fourth embodiment of the present invention as viewed from above (front).

FIG. 11 is a sectional view taken along section line EE in FIG. 10;

FIG. 12 is a sectional view taken along the line FF of FIG. 11;

[Explanation of symbols]

 10, 20, 30, 40 All-color LED lamp 11 LED chip 11R Red LED chip 11G Green LED chip 11B Blue LED chip 12, 22, 32, 42 Lead frame (lead) 15 Resin mold (enclosure) 16 Lens 41 Base (outer enclosure) 43 Reflector (outer enclosure) 44 Resin mold (outer enclosure)

Claims (2)

[Claims] 1. three light-emitting diode chips including a red light-emitting diode chip that emits red light, a green light-emitting diode chip that emits green light, and a blue light-emitting diode chip that emits blue light; A plurality of leads electrically connected to each of the diode chips; an outer enclosure surrounding and protecting and sealing the periphery of the three light emitting diode chips; and the three light emitting diode chips. An all-color light emitting diode lamp, comprising: three lenses respectively corresponding to each other and provided independently of each other. 2. The all-color light emitting diode lamp according to claim 1, wherein the plurality of leads extend in a straight line from the bottom of the envelope.