KR20070066113A - Luminous element having arrayed cells for ac - Google Patents

Abstract

An AC(Alternative Current) light emitting element having arrayed cells is provided to prevent damage of light emitting cells due to excessive voltage and current by using a resistance element in light emitting cell blocks. A light emitting element includes first and second source voltage connecting terminals(191,192), and plural light emitting cell blocks(110~180). The first and second source voltage connecting terminals are connected with an external source voltage(1000). The light emitting cell blocks, which are parallel-connected between the first and second source voltage connecting terminals, are driven at different voltages. The same voltages are applied to the light emitting cell blocks. Each of the light emitting cell blocks includes plural light emitting cell arrays(101~108) and resistors(R1~R8) so as to maintain constant resistance between the blocks.

Description

Luminous element having arrayed cells for AC}

1 is a circuit diagram of a conventional light emitting device.

2 is a graph showing light emission characteristics of a conventional light emitting device.

3 is a circuit diagram illustrating an AC light emitting device according to a first embodiment of the present invention.

4 is a graph for showing light emission characteristics of the AC light emitting device according to the first embodiment;

FIG. 5 is a circuit diagram of an AC light emitting device having a rectifying part provided outside, and FIG. 5B is a circuit diagram of an AC light emitting device provided inside a rectifying part.

6 is a graph showing light emission characteristics of an AC light emitting device according to a second exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1, 100: light emitting cell 10, 1000: external power

20: light emitting cell block 400: rectifier

110, 120, 130, 140, 150, 160, 170, 180: light emitting cell array

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternating light emitting device, and more particularly, to an alternating light emitting device capable of preventing damage to a light emitting device due to a flicker phenomenon and an AC peak voltage when driven from an AC power source.

In general, the light emitting device could only be driven by a DC power supply due to diode characteristics. Therefore, the light emitting device using the conventional AC light emitting device is not only limited in use, but also needs to include a separate circuit such as a rectifier circuit in order to use the AC 220V power source used at home. Accordingly, there is a problem that the circuit of the light emitting device becomes complicated and its manufacturing cost increases.

In order to solve this problem, researches on light emitting devices capable of driving a plurality of light emitting cells in series or in parallel with AC power are being actively conducted.

1 is a circuit diagram of a conventional light emitting device, Figure 2 is a graph for showing the light emitting characteristics of a conventional light emitting device.

1 and 2, a conventional light emitting device includes an AC power supply 10, a plurality of light emitting cell arrays in two rows that are connected in series with the AC power supply 10, and each light emitting cell array is inversely connected to each other. Light emitting cell block 20 and an external resistor R1 connected between the light emitting cell block 20 and the AC power source 10.

In general, the 220V voltage of 50 to 60Hz used in the home is applied with a voltage close to the peak voltage (Peak voltage) of about 300V, as shown in (a) of FIG. This excessive applied current damages the light emitting cells of the light emitting cell block. Therefore, in order to solve this problem, an external resistor must be connected in series between the light emitting cell block and the AC power supply to drive the light emitting cell block.

However, the use of the external resistor as described above accounts for about 30% of the total power consumption, resulting in an increase in the overall power consumption and a problem of lowering the luminous efficiency of the light emitting diode.

In addition, in the light emitting device to which the AC power source of 50 to 60 Hz shown in FIG. 2A is applied, flicker occurs in which the difference between the light emitting area and the non-light emitting area is obvious. In order for the plurality of light emitting cells to emit light, a voltage value higher than a threshold voltage of the light emitting cells must be applied. For example, when ten light emitting cells having a threshold voltage of 0.5V are connected in series, the light emitting cells emit light when a voltage of 5V or more is applied. Moreover, AC voltage has the characteristic that the absolute value of the voltage changes with time.

In order to emit light of a light emitting device having a plurality of light emitting cells connected in series, the light emitting device does not emit light at a voltage lower than the threshold voltage of the light emitting cell but emits light at a voltage higher than the threshold voltage. Therefore, in the light emitting device to which the AC power source as shown in FIG. 2A is applied, when the voltage of the AC power source is the peak value as shown in FIG. 2B, the light emission amount becomes the maximum value, and the light emitting element hardly emits light in other areas. Flicker phenomenon appears. There is a problem that light flutter occurs due to the flicker phenomenon.

Accordingly, in order to solve the above problem, the present invention applies the same voltage value between a plurality of light emitting cell arrays capable of emitting light in different voltage regions and individual light emitting cells in the plurality of light emitting cell arrays. This applied voltage causes a voltage change through the resistance and sequentially emits each of the light emitting cells in the light emitting cell block, thereby minimizing the flicker phenomenon and damaging the individual light emitting cells due to excessive applied voltage and current. It is an object to provide a light emitting element that can be prevented.

A first and second power connection terminals connected to an external power source according to the present invention, and a plurality of light emitting cell blocks connected in parallel between the first and second power connection terminals and emitting light at different voltages; The light emitting device to which the same voltage is applied is provided to the plurality of light emitting cell blocks connected in parallel between the first and second power supply connecting terminals.

In addition, the rectifying unit for rectifying the external power source according to the present invention, and a plurality of light emitting cell blocks connected in parallel between the positive power supply terminal and the negative power supply terminal of the rectifier and driven at different voltages, the positive power supply terminal and the negative power supply Provided are light emitting devices in which the same voltage is applied to the plurality of light emitting cell blocks connected in parallel between terminals.

Here, each of the plurality of light emitting cell blocks includes a plurality of light emitting cell arrays connected in series and a resistance member which makes the resistance value between the plurality of light emitting cell blocks constant.

The resistance value of the resistance member has a larger value as the number of series-connected light emitting cells in the light emitting cell block is smaller, and as the number is larger, the resistance value is smaller.

The light emission voltage of the light emitting cell block is varied according to the number of light emitting cells connected in series in the light emitting cell block.

The plurality of light emitting cell blocks may include a plurality of positive voltage light emitting cell arrays and a negative voltage light emitting cell array, and the plurality of positive voltage light emitting cell arrays and the plurality of negative voltage light emitting cell arrays may include first and second power sources. Anti-parallel connection is made between the connection terminals.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. Like numbers refer to like elements in the figures.

3 is a circuit diagram illustrating an AC light emitting device according to a first embodiment of the present invention.

Referring to FIG. 3, the light emitting device according to the present embodiment includes first and second power connection terminals 191 and 192 connected to an external power source 1000, and first and second power connection terminals 191 and 192. ) And a plurality of light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180 connected in parallel and driven at different voltages. In the present embodiment, the same voltage is applied to the plurality of light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180 connected in parallel between the first and second power connection terminals 191 and 192. .

Each of the plurality of light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180 includes a light emitting cell array 101, 102, 103, 104, 105 in which a plurality of light emitting cells 100 are connected in series. And resistance members R1 to R8 for constant resistance values between the 106, 107, and 108 and the plurality of light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180. The plurality of light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180 have different numbers of light emitting cells 100 connected in series therein. The resistance members R1 to R8 may use various resistance elements that hinder the flow of current.

The plurality of light emitting cell arrays 101, 102, 103, 104, 105, 106, 107, and 108 provided in the plurality of light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180 are single. Is formed on the wafer. The light emitting cell arrays 101, 102, 103, 104, 105, 106, 107, and 108 sequentially form an N-type semiconductor layer, an active layer, and a P-type semiconductor layer on a wafer, and individually form a predetermined patterning process. Electrically and physically insulated between the light emitting cells 100, and exposes the N-type semiconductor layer of each light emitting cell 100. Thereafter, the N-type semiconductor layer of the light emitting cell 100 and the P-type semiconductor layer of the light emitting cell 100 adjacent thereto are electrically connected between the light emitting cells 100 by using a conductive metal. As a result, the plurality of light emitting cell arrays 101, 102, 103, 104, 105, 106, 107, and 108 may be formed on a single wafer. In this case, the light emitting cells may be electrically connected through an air bridge process or a step cover process.

Here, an electrode may be formed on each semiconductor layer. Either an N-type electrode or a P-type electrode of the light emitting cell 100 positioned at the edge of each light emitting cell array 101, 102, 103, 104, 105, 106, 107, 108 is the first power connection terminal 191 ) Can be connected.

In the present embodiment, as shown in FIG. 3, eight light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180 are included, and individual light emitting cell blocks 110, 120, 130, and 140 are provided. , 150, 160, 170, 180 are connected to different numbers of light emitting cells 100 to emit light at different voltages. Accordingly, resistance members R1 to R8 having different capacities are provided in the respective light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180 so that the same voltage is applied. This is because the voltages and currents applied to the circuit elements connected in parallel when the resistance values of the circuit elements are the same are divided and applied to the same values.

In addition, the plurality of light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180 are positive voltage light emitting cell blocks 110, 120, 130, 140, and negative voltage light emitting cell blocks 150, 160, 170, 180, and they are antiparallel connected between the first and second power connection terminals 191, 192, respectively. That is, the individual light emitting cells 100 in the first to fourth light emitting cell blocks 110, 120, 130, and 140 are connected in series in different numbers, and the second power connection terminal 192 and the first power connection terminal ( 191 is forward connected.

The individual light emitting cells 100 in the fifth to eighth light emitting cell blocks 150, 160, 170, and 180 are connected in series in different numbers, and the second power connection terminal 192 and the first power connection terminal 191 are connected in series. Are connected in reverse order.

In this case, the forward and the reverse direction refer to the current flow between the two terminals, and the current flows from the second power connection terminal 192 to the first power connection terminal 191 based on the second power connection terminal 192. The direction is referred to as the forward direction, and the direction when the current flows from the first power connection terminal 191 to the second power connection terminal 192 is referred to as the reverse direction. Once again, the cathodes of the first to fourth light emitting cell blocks 110, 120, 130, and 140 are commonly connected to the first power connection terminal 191, and the anodes are provided through the resistance members R1 to R8. It is connected to the second power connection terminal 192. The anodes of the fifth to eighth light emitting cell blocks 150, 160, 170, and 180 are commonly connected to the first power connection terminal 191, and the cathodes are connected to the second power connection terminal through the resistance members R1 to R2. 192 are respectively connected.

Here, in the second light emitting cell block 120, a larger number of light emitting cells 100 are connected in series than the first light emitting cell block 110, and the third light emitting cell block 130 is the second light emitting cell block 120. A greater number of light emitting cells 100 are connected in series, and the fourth light emitting cell block 140 is connected in series to a greater number of light emitting cells 100 than the third light emitting cell block 130. In addition, in the sixth light emitting cell block 160, a greater number of light emitting cells 100 are connected in series than the fifth light emitting cell block 150, and the seventh light emitting cell block 170 is the sixth light emitting cell block 160. More light emitting cells 100 are connected in series, and in the eighth light emitting cell block 180, a larger number of light emitting cells 100 are connected in series than the seventh light emitting cell block 170. In this case, the same number of light emitting cells 100 are included in the first and fifth light emitting cell blocks 110 and 150, and the same number of light emitting cells (120 and 160) is included in the second and six light emitting cell blocks 120 and 160. 100 and the same number of light emitting cells 100 in the third and seventh light emitting cell blocks 130 and 170, and the same number in the fourth and eighth light emitting cell blocks 140 and 180. Light emitting cell 100.

As a result, the individual light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180 may be driven at different voltages.

For example, when an AC power source of 220V is used as an external power source, the first and fifth light emitting cell blocks 110 and 150 may emit light within an absolute value of 1 to 70V in the range of the voltage of the AC power source. The second and sixth light emitting cell blocks 120 and 160 adjust the number of the light emitting cells 100 so that the absolute value of the AC power is within the range of 71 to 140 V, and the third and the third light emitting cell blocks 120 and 160 are adjusted. 7 The light emitting cell blocks 130 and 170 adjust the number of light emitting cells 100 so that the absolute voltage of the AC power is within the range of 141 to 210V, and the fourth and eighth light emitting cell blocks 140 and 180 are The number of light emitting cells 100 is adjusted so that the absolute value of the voltage of the AC power is emitted in the range of 211 to 280V.

The above-described voltage range is an example, and the above-described voltage is varied by varying the number of light emitting cells 100 connected in series to one light emitting cell block 110, 120, 130, 140, 150, 160, 170, 180. The range can be adjusted freely.

By changing the number of light emitting cells 100, the light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180 may be driven at different voltages. Here, the number of light emitting cells 100 may vary in accordance with the operating voltage and the breakdown voltage of each light emitting cell 100. This causes the light emitting cell 100 to emit light when a voltage higher than the threshold voltage of each light emitting cell 100 is applied to both ends of the light emitting cell. In addition, when the light emitting cells 100 are connected in series, an applied voltage is applied to one light emitting cell 100 by the light emitting cells 100 connected in series. Therefore, when the light emitting cells 100 are connected in series, the breakdown voltage of the light emitting cells 100 also increases.

For example, when the threshold voltage of one light emitting cell 100 is 0.7V, the light emitting cell 100 emits light when the voltage at both ends of the light emitting cell 100 is 0.7V or more. However, when the two light emitting cells 100 are connected in series, the light emitting cells 100 emit light only when a voltage of 1.4 V or more is applied across the two light emitting cells 100 connected in series. In addition, when the breakdown voltage of one light emitting cell 100 is 5V, a breakdown phenomenon occurs when a voltage of 5V or more is applied to one light emitting cell 100. However, when two light emitting cells 100 are connected in series, a breakdown phenomenon may occur when a voltage of 10 V or more is applied.

In addition, as described above, the first to eighth light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180 connected in parallel between the first and second external power terminals 191 and 192. The same power is applied to each. To this end, the resistance values of the first to fourth resistance members R1 to R4 in the first to fourth light emitting cell blocks 110, 120, 130, and 140 are different from each other, and the fifth to eighth light emitting cell blocks 150 are different from each other. , The resistance values of the fifth to eighth resistance members R5 to R8 in, 160, 170, and 180 are different from each other. However, at this time, the resistance values of the first and fifth resistance members R1 and R5 and the resistance values of the second and sixth resistance members R2 and R6 are the same, and the third and seventh resistance members R3, It is preferable that the resistance value of R7) and the resistance values of the fourth and eighth resistance members R4 and R8 are the same.

As a result, the same power may be applied to the first to eighth light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180. At this time, when the AC power source is used as an external power source, the first light emitting cell block 110 emits light due to a low voltage in the forward direction, and then the second light emitting cell block 120 and the third light emitting cell block 120 gradually. Finally, a high voltage is applied to the fourth light emitting cell block 140 to emit light. In this embodiment, since the light emitting cell 100 included in the first light emitting cell block 110 is destroyed due to a high voltage applied when the fourth light emitting cell block 140 emits light, the first light emitting cell according to the present exemplary embodiment. This problem can be solved by increasing the resistance value of the first resistance member R1 in the block 110. That is, since more voltage is applied to the first resistance member R1, a stable light emission voltage can be applied to the light emitting cell 100 in the first light emitting cell block 110. Therefore, the resistance value also has the smallest value for the fourth resistance member R4 because the first resistance member R1 is largest and gradually decreases.

Hereinafter, an operation of the light emitting device according to the present embodiment will be described with reference to the drawings.

4 is a graph showing light emission characteristics of the AC light emitting device according to the first embodiment.

4A is a waveform diagram of an AC power supply, and FIG. 4B is a view showing the amount of light emitted by the light emitting element.

In the light emitting device of the present exemplary embodiment, the plurality of light emitting cell blocks 110, 120, 130, 140, 150, 160, whose voltage levels of the external power supply 1000 are connected between the first and second external power supply terminals 191 and 192. Equally applied to 170, 180). Therefore, when the AC power source shown in FIG. 4A is used as the external power source 1000, the light emission amount of FIG. 4B is shown. As such, since the light is emitted in almost all areas to which the external power source 1000 is applied, the loss of the external power source 1000 can be prevented and the flicker shape can be improved.

As shown in the drawing, when the AC power source is in the forward direction, the voltage level of the forward power source is defined as areas A, B, C, and D, and the light emitting cell blocks 110, 120, 130, and 140 that emit light according to the respective areas are respectively. Will be different. That is, when an external power source 1000 using an AC power source is applied from outside and the voltage of the power source is within the A region, the first to eighth light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, Although the same voltage is applied to the region A of 180, only the first light emitting cell block 110 emits light (see A ′ of FIG. 4B). Since the small number of light emitting cells 100 are connected in series at the wafer level in the first light emitting cell block 110, the light emitting cells 100 may easily emit light even at a small voltage.

In addition, when the voltage of the AC power supply rises to be in the region B, not only the first light emitting cell block 110 but also the second light emitting cell block 120 emit light (see B ′ of FIG. 4B). In addition, when the AC power is in the C region, the first to third light emitting cell blocks 110, 120, and 130 emit light (see C ′ in FIG. 4B), and when the AC power is in the D region. All of the first to fourth light emitting cell blocks 110, 120, 130, and 140 emit light (see D ′ in FIG. 4B).

On the other hand, when AC power is applied in the reverse direction, the light emitting cell blocks 150, 160, 170, and 180 are defined as E, F, G, and H areas according to the voltage level of the reverse power source, and emit light according to each area. Will be different. That is, when the external power source 1000 using the AC power is externally applied and the voltage of the power source is within the E region, only the fifth light emitting cell block 150 emits light (see E ′ in FIG. 4B). ). In addition, when the voltage of the AC power supply is within the F region, the fifth and sixth light emitting cell blocks 150 and 160 emit light (see F ′ in FIG. 4B). In addition, when the AC power source is in the G region, the fifth to seventh light emitting cell blocks 150, 160, and 170 emit light (see G ′ in FIG. 4B), and when the AC power source is in the H region. All of the fifth to eighth light emitting cell blocks 150, 160, 170, and 180 emit light (see H ′ in FIG. 4B).

As described above, when the external AC power is applied with a voltage having a high potential at a low potential in the forward direction, the same voltage is applied to the first to eighth light emitting cell blocks 110, 120, 130, 140, 150, 160, 170, and 180. Is applied, but the first to fourth light emitting cell blocks 110, 120, 130, and 140 sequentially emit light according to the voltage level, and when the voltage of the low potential is applied at a high potential, the fourth according to the voltage state. The first light emitting cell blocks 140, 130, 120, and 110 sequentially emit light. In addition, when the high potential voltage is applied at the low potential in the reverse direction, the fifth to eighth light emitting cell blocks 150, 160, 170, and 180 sequentially emit light, and when the voltage at the low potential is applied at the high potential. The eighth to fifth light emitting cell blocks 180, 170, 160, and 150 sequentially emit light.

In the above-described embodiment, a light emitting cell block which is directly connected to an external AC power source and driven according to the forward and reverse voltages of the AC power source is divided. However, the present invention is not limited thereto, and a separate bridge circuit may be formed such that only an AC power applied to the light emitting cell block is applied in the forward direction. Hereinafter, a light emitting device according to another embodiment of the present invention including a bridge circuit will be described with reference to the drawings. In the following description, a description overlapping with the previous embodiment will be omitted.

FIG. 5 illustrates a second embodiment of the present invention. FIG. 5A is a circuit diagram of an AC light emitting device having a rectifying part provided outside, and FIG. 5B is a circuit diagram of an AC light emitting device provided inside an rectifying part.

5 and 6, the light emitting device according to the present exemplary embodiment includes a rectifier 400 for rectifying the external power source 1000, and a positive power terminal Q2 and a negative power terminal Q4 of the rectifier 400. And a plurality of light emitting cell blocks 110, 120, and 130 connected in parallel to each other and driven at different voltages. In this case, the same voltage is applied to the plurality of light emitting cell blocks 110, 120, and 130 connected in parallel between the two terminals of the rectifier 400. Each of the light emitting cell blocks 110, 120, and 130 includes cell blocks 110, 120, and 130 in which a plurality of light emitting cells 100 are connected in series, and resistance members R1, R2, and R3.

As shown in FIG. 5, the rectifier 400 is connected to a bridge circuit in which a plurality of diodes 410 to 440 are disposed between the first to fourth nodes Q1 to Q4. That is, the anode terminal of the first diode unit 410 is connected to the first node Q1, and the cathode terminal is connected to the second node Q2 which is a positive power supply terminal. The anode terminal of the second diode unit 420 is connected to the third node Q3 and the cathode terminal is connected to the second node Q2. The anode terminal of the third diode unit 430 is connected to the fourth node Q4, which is a negative power supply terminal, and the cathode terminal is connected to the third node Q3. The anode terminal of the fourth diode unit 440 is connected to the fourth node Q4 and the cathode terminal is connected to the first node Q1. The first to fourth diode parts 410 to 440 are preferably formed outside the light emitting cell blocks 110, 120, and 130 using light emitting cells. In this case, the first and third nodes Q1 and Q3 of the rectifier 400 are connected to the external power source 1000, and the second node Q2 is a resistor member R1 of the light emitting cell blocks 110, 120, and 130. , R2 and R3 are connected, and the fourth node Q4 is connected to the light emitting cell 100. Of course, it can also be manufactured using a separate rectifying diode outside the light emitting device.

In addition, as illustrated in FIG. 6, the light emitting cell blocks 110, 120, and 130 may be disposed in the rectifier 400. In the manufacturing of the light emitting cell arrays 101, 102, and 103 in which a plurality of light emitting cells 100 are connected in series, the rectifying unit 400 using the light emitting cells 100 is manufactured at the outer side thereof, and the fourth of the rectifying units 400 is formed. The node Q4 is connected to one terminal of the light emitting cell 100 of the light emitting cell arrays 101, 102, 103. Subsequently, the second terminal Q2 of the rectifier 400 is connected to the other terminal of the light emitting cell 100 of the light emitting cell arrays 101, 102, and 103 using the resistance members R1, R2, and R3. An example light emitting device is produced.

The operation of the light emitting device having the above-described structure will be described below.

6 is a graph illustrating light emission characteristics of an AC light emitting device according to a second exemplary embodiment of the present invention.

6A is a waveform diagram of a power source applied to the second node of the rectifying unit, and FIG. 6B is a view showing the amount of light emitted by the light emitting element.

In the present embodiment, when an external power source such as the sine wave of FIG. 4A is applied, a power source having a reversed voltage as shown in FIG. 7A through a rectifying action by the rectifying unit 400 is applied. Is generated.

Therefore, as in the above-described embodiment, the light emitting cell blocks 110, 120, in which the voltage whose voltage level changes every second in the forward direction are connected in parallel between the positive power supply terminal Q2 and the negative power supply terminal Q4 of the rectifier 400. 130 may be applied in the same manner, and light emission may be performed according to voltage levels applied thereto.

That is, the voltage level of the external power source 1000 rectified by the rectifier 400 emits the first light emitting cell block 110 in the X region, and the first and second light emitting cell blocks 110 and 120 in the Y region. Emits light and the first to third light emitting cell blocks 110, 120, and 130 emit light in the Z region.

Through the operation as described above, the light emitting cell blocks continue to emit light for each section according to the voltage level, thereby improving flicker and preventing eye strain.

Although the invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the invention is not limited thereto, but is defined by the claims that follow. Accordingly, one of ordinary skill in the art may variously modify and modify the present invention without departing from the spirit of the following claims.

As described above, the present invention provides a plurality of light emitting cell blocks capable of emitting light in different voltage regions and light emitting cells caused by transient voltages and currents of an AC power supply through resistance members for applying the same voltage to each of the light emitting cell blocks. Can prevent the damage.

In addition, the flicker phenomenon in which the light emitting device flickers due to the swing of the domestic AC voltage can be improved, thereby eliminating annoying phenomenon.

Claims (6)

First and second power connection terminals connected to an external power source; A plurality of light emitting cell blocks connected in parallel between the first and second power connection terminals and emitting light at different voltages; The same voltage is applied to the plurality of light emitting cell blocks connected in parallel between the first and second power supply connecting terminals. Rectifier for rectifying the external power source; A plurality of light emitting cell blocks connected in parallel between the positive and negative power terminals of the rectifying unit and driven at different voltages; The same voltage is applied to the plurality of light emitting cell blocks connected in parallel between the positive power supply terminal and the negative power supply terminal. The method according to claim 1 or 2, wherein each of the plurality of light emitting cell blocks, A plurality of light emitting cell arrays connected in series; A light emitting device comprising a resistance member for maintaining a constant resistance value between the plurality of light emitting cell blocks. The method according to claim 1 or 2, The resistance value of the resistance member has a larger value as the number of series-connected light emitting cells in the light emitting cell block is larger, and the larger the number is a smaller value. The method according to claim 1 or 2, And a light emitting voltage of the light emitting cell block varies according to the number of light emitting cells connected in series in the light emitting cell block. The method of claim 1, wherein the plurality of light emitting cell blocks, A plurality of positive voltage light emitting cell arrays and negative voltage light emitting cell arrays, And the plurality of positive voltage light emitting cell arrays and the plurality of negative voltage light emitting cell arrays are anti-parallel connected between first and second power connection terminals.

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