JPH04120256U - multicolor light emitting diode - Google Patents

Abstract

(57) [Summary] [Objective] To provide a multicolor LED capable of emitting light in a plurality of different display colors with a simple configuration. [Configuration] Three lead frames 11 and 1 extending vertically
2, 13, and LED chips 1 of mutually different display colors attached to the upper end surfaces of the first lead frame 11 and the second lead frame 12, respectively, among the lead frames.
4, 15, 16, and 17, and the LED chips 14 and 15 attached to the upper end surface of at least one of the first lead frame 11 and the second lead frame 12 are arranged in parallel with each other and have opposite polarities. The LED chips are electrically configured to have two different display colors.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses LED chips with different display colors such as red, green, blue, and yellow. Includes LED chips for each display color that can be emitted selectively or in any combination. A multicolor light emitting diode that displays multiple display colors by being illuminated. The present invention relates to LEDs (hereinafter referred to as multicolor LEDs).

0002

[Conventional technology]

Conventionally, LED chips with different display colors, for example red, green, and blue, were used. Each LED chip contains a multi-colored LED that is mounted on a lead frame independently. For each LED chip, a corresponding lead frame is attached. By applying driving voltages selectively or in any combination through the A light emitting display of a desired display color is performed.

0003

[Problem that the idea aims to solve]

However, in multicolor LEDs with such a configuration, for each LED, Since each lead frame is required, the number of parts increases. This increases component costs, complicates assembly, and impairs assembly workability. There was a problem that it became

0004 In view of the above points, the present invention has a simple configuration that allows a light emitting display with multiple different display colors to be displayed. The object of the present invention is to provide a multicolor LED that can be used for display purposes.

[0005]

[Means to solve the problem]

According to the present invention, the above purpose is to provide three lead frames extending vertically and of the lead frames, the first lead frame and the second lead frame Contains LED chips with different display colors attached to the top surface. and the upper end surface of at least one of the first lead frame and the second lead frame. The LED chips attached to the LED chips are electrically configured to have opposite polarities. A multicolor light emitting diode with two LED chips with different display colors. This will be achieved.

[0006]

[Effect]

According to the above configuration, at least one lead frame among the three lead frames Two LEDs with different display colors are placed in parallel on the upper end of the frame with opposite polarities. Attach the D chip and reverse the polarity of the driving voltage applied to the LED chip. This allows only one of the LED chips to selectively emit light. Using three lead frames, which have been widely used in the past, three- or four-color L It is possible to mount the ED chip on a lead frame.

[0007] Therefore, by making each LED chip emit light by pulse lighting drive, Adjust the peak current and duty ratio appropriately to display the desired color tone. Since the number of parts can be reduced and the configuration can be simplified, it is easier to assemble. It is easy to set up, has a compact overall structure, and reduces costs.

[0008]

【Example】

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. 1 and 2 show an embodiment of the multicolor LED according to the present invention, and FIG. 1 shows a flat LED. FIG. 2 is a side view. The multicolor LEDs 10 extend substantially vertically in parallel, as shown in FIGS. 1 and 2. three lead frames 11, 12, 13, and the third lead frame among these lead frames. Two pieces attached to the upper end surface 11a of one lead frame 11, namely, the first and The second LED chips 14 and 15 and the upper end surface 12a of the second lead frame 12 The two LED chips 16 and 17 to be attached, that is, the third and fourth LED chips 16 and 17, and Covers the upper end areas of the LED chips 14 to 17 and lead frames 11, 12, 13. Lenses molded with transparent or milky white resin (Fig. (not shown). In this case, the upper end surfaces of lead frames 11 and 12 The reflective surfaces 11a and 12a are formed into concave shapes such as paraboloids, for example.

[0009] The LED chips 14 and 15 are respectively provided on the upper end surface of the first lead frame. 11a by die bonding etc. and electrically connected to the lead frame 11. and are connected to the upper end of the second lead frame 12 respectively. They are earbonded and are therefore connected in parallel to each other. Further, the LED chips 16 and 17 are respectively mounted on the second lead frame. The lead frame 12 is fixed on the upper end surface 12a by die bonding or the like. and are electrically connected to the upper end of the third lead frame 13 respectively. wire bonded to each other, which also connects them in parallel to each other. ing.

0010 Here, each of the LED chips 14 to 17 is an LED chip 14 as shown in FIG. is red, the LED chip 15 is green, and the LED chips 16 and 17 are blue, The red LED chip 14 and the green chip 15 have opposite polarity, and the blue LED Chips 16 and 17 have the same polarity.

[0011] The multicolor LED 10 according to the present invention is constructed as described above, and consists of three lead-offs. A second lead is connected to the frame 11, 12, 13 through the lower lead portion (not shown). The frame 12 is used as a common electrode for the first or third lead frame 11, 13. When power is selectively supplied, the first and second LED chips 14, 15 or The driving voltage is applied to the third and fourth LED chips 16 and 17. becomes. At this time, the circuit configuration of the multicolor LED 10 is as shown in FIG. When power is supplied to the first and second LED chips 14 and 15, their driving Depending on the polarity of the dynamic voltage, the first LED chip 14 or the second LED chip 15 Either one of them will be made to selectively emit light. In this way, each LED chip 14, 15 or 16 and 17, respectively By selectively emitting light, red, green, or blue display is performed. It can be done.

0012 Furthermore, as shown in the time chart of FIG. By driving the to 17 with pulse lighting, its peak current, duty ratio, etc. can be adjusted. By appropriately controlling the display color, it is possible to adjust the display color to a desired tone.

[0013] In the case shown in the figure, the blue LED chips 16 and 17 have relatively low luminance. By making two lights emit light at the same time, in the case of light emitting display of other display colors, However, the luminance is not balanced. If this is not a problem, as shown in Figure 5, one blue LED chip, e.g. For example, the blue LED chip 17 may be omitted, or other examples may be used, as shown in FIG. At the same time, replace the yellow LED chip 16 with the other blue LED chip 16. By connecting the polarities, a multicolor LED capable of displaying four colors can be provided. It becomes.

[0014]

[Effect of the idea]

As described above, according to the present invention, at least one of the three lead frames Also, on the top end surface of one lead frame, two tables are placed in parallel with opposite polarity to each other. Attach LED chips with different color indications and adjust the driving voltage applied to the LED chips. By reversing the polarity, only one of the LED chips selectively emits light. Therefore, by using three lead frames that have been widely used in the past, It is possible to mount colored or four-colored LED chips on a lead frame. Therefore, by causing each LED chip to emit light by pulse lighting drive, Adjust the peak current and duty ratio appropriately to emit light with the desired display color. Since the display can be performed, the number of parts can be reduced. It also simplifies configuration. Because it is easy to assemble, the overall structure is compact and costs are reduced. can be done. Thus, according to the present invention, light emission of a plurality of different display colors can be achieved with a simple configuration. An extremely superior multi-color LED is provided for display purposes.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the structure of an embodiment of a multicolor LED according to the present invention.

FIG. 2 is a side view of the multicolor LED of FIG. 1;

FIG. 3 is a circuit diagram showing the electrical configuration of the multicolor LED in FIG. 1;

FIG. 4 is a time chart showing an example of a method for driving each LED chip of the multicolor LED of FIG. 1;

FIG. 5 is a circuit diagram showing a modification of the multicolor LED of FIG. 1;

FIG. 6 is a circuit diagram showing another modification of the multicolor LED of FIG. 1;

[Explanation of symbols]

10...Multicolor LED, 11...first lead frame, 12... second lead frame, 13...Third lead frame, 14...first LED chip, 15... second LED chip, 16...Third LED chip, 17...Fourth LED chip.

Claims (1)

[Scope of utility model registration request] 1. Three lead frames extending substantially vertically, and LEDs with different display colors attached to the upper end surfaces of a first lead frame and a second lead frame, respectively. Two displays including a chip and electrically configured such that the LED chips attached to the upper end surface of at least one of the first lead frame and the second lead frame are parallel to each other and have opposite polarities. A multicolor light emitting diode characterized by LED chips with different colors.