KR101803011B1 - Light-emitting device - Google Patents

Abstract

The present invention relates to a light emitting device including a plurality of light emitting cells formed on a single substrate, the light emitting device including a first light emitting cell group and a second light emitting cell group corresponding to the first light emitting cell group, Each of the first and second light emitting cell groups includes a light-
Each pair of terminals of the same polarity includes two half-wave emitting cells electrically connected to each other, and a pair of terminals of the same polarity electrically connected to each other are connected to a pair of terminals of the same polarity electrically connected to each other, At least two pairs of half-wave emitting cells; And
And at least one light emitting cell electrically connected to two adjacent pairs of half wave light emitting cells,
Each of the half wave light emitting cells has a first terminal and a second terminal, and the wave emitting cells have a third terminal having the same polarity as the first terminal and a fourth terminal having the same polarity as the second terminal,
Each of the terminals of the propagation light emitting cells is electrically connected to the terminals of the same polarity electrically connected to each other of the half-wave emitting cells, the third terminal is connected to the second terminal, Terminal,
The nth (n is a natural number) propagation light emitting cell from one end of the first light emitting cell group and the nth (n is a natural number) propagation light emitting cell from one end of the second light emitting cell group are connected to each other And are electrically connected to each other.

Description

[0001] LIGHT-EMITTING DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device, and more particularly, to a light emitting device that can be driven by being connected to an AC power source without using an external AC-DC converter.

The light emitting diode is an electroluminescent semiconductor device having a structure in which an N-type semiconductor and a P-type semiconductor are bonded to each other and emits light by recombination of electrons and holes. Such a light emitting diode is widely used as a display device and a backlight, and consumes less power and has a longer life than a conventional light bulb or a fluorescent lamp. Thus, the light emitting diode is used instead of an incandescent lamp and a fluorescent lamp.

On the other hand, there is an ongoing effort to improve the efforts and reliability to improve the light emission output of the high voltage light emitting diode with respect to the chip area. Particularly, there is a demand for a light emitting device in which a plurality of light emitting cells are appropriately arranged within a limited area of a light emitting diode chip to increase the light emitting area and effectively connect the light emitting cells with wiring.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light emitting device in which the arrangement of light emitting cells is improved to minimize a reverse voltage applied to a single light emitting cell.

Another object of the present invention is to provide a light emitting device capable of preventing an overcurrent from flowing to a specific light emitting cell during a light emitting device operation.

A light emitting device according to an aspect of the present invention includes a plurality of light emitting cells formed on a single substrate, the light emitting device including a first light emitting cell group and a second light emitting cell group corresponding to the first light emitting cell group And each of the first and second light emitting cell groups includes a first light emitting cell group,

Each pair of terminals having the same polarity includes two half-wave emitting cells electrically connected to each other, and a pair of terminals of the same polarity electrically connected to each other are connected to the other pair of terminals of the same polarity electrically connected to each other, At least two pairs of half-wave emitting cells; And

And at least one light emitting cell electrically connected to two adjacent pairs of half wave light emitting cells,

Each of the half wave light emitting cells has a first terminal and a second terminal, and the wave emitting cells have a third terminal having the same polarity as the first terminal and a fourth terminal having the same polarity as the second terminal,

Each of the terminals of the propagation light emitting cells is electrically connected to the terminals of the same polarity electrically connected to each other of the half-wave emitting cells, the third terminal is connected to the second terminal, Terminal,

The nth (n is a natural number) propagation light emitting cell from one end of the first light emitting cell group and the nth (n is a natural number) propagation light emitting cell from one end of the second light emitting cell group are connected to each other And are electrically connected to each other.

Preferably, the light emitting device is characterized in that the one end of the first light emitting cell group and the one end of the second light emitting cell group are electrically connected to each other.

Preferably, the light emitting device is characterized in that each of the first and second light emitting cell groups includes two pairs of half wave light emitting cells and one wave light emitting cell.

Preferably, the light emitting device further comprises: a node in which a pair of half-emission cells of the two pairs of half-emission cells of the first emission cell group are commonly connected; and a pair of half- And the nodes to which the pair of half-wave emitting cells of the cells are connected in common are electrically connected to each other.

Preferably, the light emitting device has a polarity of a terminal of half-emissive cells connected to the node of the first emissive cell group and a polarity of a terminal of half-emissive cells connected to the node of the second emissive cell group .

Preferably, each of the first and second light emitting cell groups includes a first electrode,

Half emissive cells electrically connected to one end of each of the two half-wave emitting cells, and terminals of the same polarity are electrically connected to the one end terminal; And

Further comprising a light emitting cell electrically connected between the one end terminal of each of the two pairs of half wave light emitting cells,

And the third terminal is connected to the second terminal and the fourth terminal is electrically connected to the first terminal, in which the third terminal is electrically connected to the first terminal.

According to the present invention, the reverse voltage applied to a single light emitting cell can be minimized, thereby reducing the risk of damage to the light emitting diode and improving the stability of the device against reverse voltage.

Further, according to the present invention, it is possible to prevent an overcurrent from flowing to a specific light emitting cell during a light emitting device operation.

FIG. 1 is a schematic circuit diagram for explaining a light emitting device 1000 according to an embodiment of the present invention.
2 is a diagram for explaining the operation of the light emitting device 1000 of FIG.
3 is a schematic circuit diagram for explaining a modification to the embodiment of the present invention.
4 is a schematic circuit diagram for explaining a light emitting device 100 according to a comparative example.
5 is a schematic circuit diagram for explaining a light emitting device 2000 according to another embodiment of the present invention.
6 is a schematic circuit diagram for explaining a light emitting device 3000 according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the length and thickness of layers and regions may be exaggerated for convenience. Like reference numerals throughout the specification denote like elements.

FIG. 1 is a schematic circuit diagram for explaining a light emitting device 1000 according to an embodiment of the present invention. Referring to FIG. 1, the light emitting device 1000 includes a plurality of semi-emissive cells h ₁ , h ₂ , h ₃ , h ₄ , h ₅ , h ₆ , h ₇ , h ₈ ; 100) and propagation light emission cells (a ₁ , a ₂ ; 200).

The term "half-wave emitting cell" alternately emits light in accordance with the phase of the AC power (in accordance with the first and second periods), and the term " Emitting cell to emit light. The same applies to the following.

In the figure, the half-wave light emitting cells (h ₁ to h ₈₎ and propagating the light emitting cells (a _1, a ₂₎ the operation of the light emitting device according to the embodiment, but shown as a respective one of the light emitting diode (100 or 200) A plurality of light emitting diodes may be connected in series to each of the half wave and propagation light emitting cells h ₁ to h ₈ , a ₁ and a ₂ in consideration of a reverse voltage applied to one light emitting cell. The same applies to the following.

Said half-wave light emitting cells (h ₁ to h _8), respectively a first terminal (e.g., an anode terminal) and a second terminal having a (e.g., a cathode terminal), the radio wave emitting cells (a _1, a ₂ each have a third terminal (for example, an anode terminal) having the same polarity as the first terminal and a fourth terminal (for example, a cathode terminal) having the same polarity as the second terminal. The first to fourth terminals are electrically connected to each other by wiring so that a plurality of light emitting cells are electrically connected to constitute a circuit as shown in Fig.

Here, "anode terminal" and "cathode terminal" are both terminals of a light emitting cell through which a current flows into and out of a light emitting cell, For example, the anode terminal may be a p-type semiconductor layer (not shown) or a transparent electrode layer formed on the p-type semiconductor layer, or an electrode pad formed on the p-type semiconductor layer or the transparent electrode layer, An n-type semiconductor layer (not shown) of the light emitting cell, or an electrode pad formed on the n-type semiconductor layer.

For example, the first terminal of the half-wave light-emitting cell (h ₁ to h ₈₎ is p- electrode pad and the second terminal is an n- electrode pad, the third terminal of the electric wave emitting cells (a _1, a ₂₎ May be a p-electrode pad and the fourth terminal may be an n-electrode pad. However, the present invention is not limited thereto, and the electrode pads may not be separately formed, and the wirings may be directly formed at the positions of the electrode pads.

Further, in this specification, the term "a pair of half-wave emitting cells" means that two half-wave emitting cells (for example, h ₁ and h ₂ ) are electrically connected to each other with the same terminals facing each other.

1, the light emitting device 1000 includes a first light emitting cell group and a second light emitting cell group that is configured to correspond to the first light emitting cell group and both ends thereof are electrically connected to both ends of the first light emitting cell group, The first light emitting cell group includes half wave light emitting cells h ₁ , h ₂ , h ₃ and h ₄ and a full wave light emitting cell a ₁ , and the second light emitting cell group includes half wave light emitting cells h ₅ , h ₆ , h _7, and h ₈ , and a wave emitting cell a ₂ .

Specifically, in wiring connection of the light emitting device 1000, the pair of half-wave emitting cells h ₁ and h ₂ of the first light emitting cell group are electrically connected to each other at the node N ₄ between the second terminals , The other pair of half-wave emitting cells h ₃ and h ₄ of the first light emitting cell group are electrically connected to each other at the node N ₂ between the first terminals and the wave emitting cell a _{1 is} connected to the nodes N ₂ , and N ₄ , respectively. Here, the electric wave emitting cells (a ₁₎ a third terminal is a node (N ₄₎ The half-wave light emitting cells (h _1, h ₂₎ a second terminal in electrical light emitting cells connected and propagated in (a ₁₎ in the The fourth terminal may be electrically connected to the first terminals of the half-light-emitting cells h ₃ and h ₄ at a node N ₂ .

The first terminal of the half wave light emitting cell h ₁ and the second terminal of the half wave light emitting cell h ₃ are electrically connected at a node N _{1 which} is _one end of the first light emitting cell group, ₂ and the second terminal of the _semi- emissive cell h ₄ may be electrically connected at a node N _{3 which} is the other end of the first light emitting cell group.

Meanwhile, the pair of half-wave emitting cells h ₅ and h _{6 of} the second light emitting cell group are electrically connected to each other at the node N ₂ 'between the first terminals, electrically between the half-wave light-emitting cell (h _7, h ₈₎ of the second terminals are electrically connected to each other in each other node (N _5), the propagation light emitting cells (a ₂₎ is the node (N ₂ ', N ₅₎ . Here, the third terminal of the radio wave emitting cell a ₂ is electrically connected to the second terminals of the half wave light emitting cells h ₇ and h ₈ at the node N ₅ , and the third terminal of the radio wave emitting cell a ₂ And a fourth terminal may be electrically connected to the first terminals of the half-light emitting cells (h ₅ , h ₆ ) at a node (N ₂ ').

The second terminal of the half wave light emitting cell h ₅ and the first terminal of the half wave light emitting cell h ₇ are electrically connected at a node N ₁ 'which is _one end of the second light emitting cell group, h ₆ and the first terminal of the half emissive cell h ₈ may be electrically connected at a node N ₃ 'which is another terminal of the second emissive cell group.

That is, each of the first and second light emitting cell groups includes two pairs of half-wave emitting cells electrically connected to each other with terminals having the same polarity, and two pairs of half- And may include one radiating light emitting cell connected thereto.

Further, by electrically connecting the node N ₂ and the node N ₂ ', the propagation light-emitting cell a ₁ of the first light-emitting cell group and the propagation light-emission cell a ₂ of the second light- The terminals are electrically connected to each other.

That is, the first propagation light emitting cell a ₁ from _one end (i.e., N ₁ node) of the first light emitting cell group and the first propagation light emitting cell a ₂ from _one end (i.e., N ₁ ' (For example, the fourth terminals) of the same polarity are electrically connected to each other.

Although the node N ₂ and the node N ₂ 'are separately shown in FIG. 1 for the sake of convenience (also in the case of N ₁ and N ₃ ), these two nodes N ₂ and N ₂ ' It can be implemented with substantially the same node, and preferably, no voltage difference occurs between these two nodes (N ₂ , N ₂ ').

On the other hand, the light emitting device 1000 may have the terminals for connecting the external power supply (t _1, t _2), the terminal (t ₁₎ being electrically connected to the node (N _1, N ₁ ') , And the terminal t ₂ may be connected to the nodes N ₃ and N ₃ '.

It will also be appreciated by those skilled in the art that the circuit of Fig. 1 can be modified like the circuit of Fig. It will also be appreciated by those skilled in the art that other embodiments of the invention, which will be described hereinafter, can also be modified in the same manner as in Fig.

Hereinafter, the operation of the light emitting device 1000 will be described with reference to FIG.

2A and 2B show light emitting cells and a current path driven in a positive half period (hereinafter referred to as a first period) and a negative half period (hereinafter referred to as a second period) of an AC voltage, respectively.

2A, when a positive voltage is applied to the terminal t ₁ (i.e., the first period), the current flows from the terminal t ₁ to the half-wave emitting cell h ₁ , the propagating light emitting cell a ₁₎ and the half-wave light-emitting cell (h _4), the through terminal (t ₂₎ half-wave light-emitting cell (h from the current path, and a terminal (t ₁₎ flowing to _7), the electric wave emitting cells (a ₂₎ and a half-wave light-emitting cell (h ₆₎ and the via formed in a current path flowing to the terminal (t _2), thereby a half-wave light emitting cells _{(h 1, h 4, h} 6, h 7) and the light from the electric wave emitting cells (a _1, a ₂₎ Lt; / RTI >

In this case, the same current flows through the half wave light emitting cells h ₁ , h ₄ , h ₆ , and h ₇ and the propagation light emitting cells a ₁ and a ₂ . That is, for example, if a current of 2i to the terminal (t ₁₎ flows, the light emitting cells are the operating current of _{(h 1, h 4, h} 6, h 7, a 1, a 2) has both i is So that the overcurrent can be prevented from flowing to the specific light emitting cell.

That is, between the node (N ₂₎ and a node (N ₂ '), by electrically connected to the node (N ₂₎ and the node (N ₃₎ the potential difference between the node (N _2') and a node (N ₃ ') The electric currents flowing into the nodes N ₂ and N ₂ 'are divided into the half-wave LED h ₄ and the half-wave LED h ₆ , and the half-wave LEDs h ₄ and h ₆ ), the current of i can flow as in the other half-wave light-emitting diode and the light-emitting diode (h ₁ , h ₇ , a ₁ and a ₂ ).

Therefore, according to an embodiment of the present invention, when the light emitting device 1000 is driven, an overcurrent can be prevented from flowing to the specific light emitting diodes h ₄ and h ₆ in the first period. This will be described later.

Next, as shown in FIG. 2B, when positive voltage is applied to the terminal t ₂ (i.e., the second period), the current flows from the terminal t ₂ to the half-wave emitting cell h ₂ , _The current path from the terminal t ₂ to the half light emitting cell h ₈ , the light emitting cell a ₂ and the half light emitting cell h ₂ through the half-wave emitting cell h ₃ and the terminal t ₁ , ₅₎ via the terminal (t ₁₎ of the half-wave emitting cells thus form a current path, and flows to _{(h 2, h 3, h} 5, h 8) and the light from the electric wave emitting cells (a _1, a ₂₎ Lt; / RTI > That is, since light is emitted from six light emitting cells among the total light emitting cells, the use efficiency of the light emitting cells is 6/10 = 60%.

In this case, the same current flows through the half wave light emitting cells h ₂ , h ₃ , h ₅ , and h ₈ and the propagation light emitting cells a ₁ and a ₂ . That is, for example, if a current of 2i to the terminal (t ₂₎ flows, the light-emitting cell is operating current _{(h 2, h 3, h} 5, h 8, a 1, a 2) has both i is So that the overcurrent can be prevented from flowing to the specific light emitting cell.

That is, between the node (N ₂₎ and a node (N ₂ '), by an electrical connection, the node (N ₂₎ and the node (N ₁₎ the potential difference between the node (N _2') and a node (N ₁ ') Since the potentials of the half-wave LEDs h ₃ and h ₅ become equal to each other, the current flowing into the node N ₂ or N ₂ 'is divided into the half-wave LED h ₃ and the half- ₅ ), the currents of i can be flowed as in the other half-wave light-emitting diodes and the light-emitting diodes (h ₂ , h ₈ , a ₁ and a ₂ ).

Therefore, according to an embodiment of the present invention, when the light emitting device 1000 is driven, an overcurrent can be prevented from flowing to the specific light emitting diodes h ₃ and h ₅ in the second period. This will be described later.

As described above, the half-wave emitting cells h ₁ , h ₄ , h ₆ , h ₇ and all the wave emitting cells a ₁ , a ₂ emit light during the first period, The half wave light emitting cells (h ₂ , h ₃ , h ₅ , h ₈ ) and all the wave emitting cells (a ₁ , a ₂ ) emit light. Thus, the half-wave light-emitting cell _{(h 1, h 4, h} 6, h 7) and the half-wave light-emitting cell _{(h 2, h 3, h} 5, h 8) is in accordance with the phase of the AC power supply (i.e., the first and (According to the second period), and the propagation light emission cells (a ₁ , a ₂ ) emit light in all the periods irrespective of the phase change of the alternating current power source. In both the half wave and the propagation light emission cell The same current can flow.

Therefore, according to an embodiment of the present invention, the efficiency of use of the light emitting cells can be increased to 60% than the reverse polarity arrangement (50%) of the conventional AC driving type LED array, It is possible to prevent the overcurrent from flowing in the light emitting cells, thereby enhancing the safety and reliability of the device.

Meanwhile, according to an embodiment of the present invention, a reverse voltage applied to the half-wave emitting cells will be described.

Terminal voltage of the amount (t ₁₎ is applied to the half-wave light-emitting cell _{(h 1, h 4, h} 6, h 7) during the first period to emit light, the half-wave light-emitting cell (h _1, h _4, h _6, h ₇₎ and to propagate the light emitting cells (a _1, a ₂₎ is applied to the voltage of the forward, the half-wave light-emitting cell _{(h 2, h 3, h} 5, h 8) is applied with a reverse voltage.

Here, the magnitude of the reverse voltage applied to each of the half wave light emitting cells h ₂ , h ₃ , h ₅ , and h ₈ is a forward voltage applied to one half-wave emitting cell connected to one terminal thereof, (For example, Vf + Vf = 2Vf) applied to one of the light emitting cells connected to the light emitting cell.

Similarly, during the terminal (t ₂₎ of the half-wave light-emitting cell is applied with a positive voltage to _{(h 2, h 3, h} 5, h 8) of the second period for emitting light, the half-wave light-emitting cell (h _1, h ₄ , h ₆ , and h ₇ are applied to the half-wave emission cells h ₁ , h ₄ , h ₆ , and h ₇ , and the magnitude of the reverse voltage applied to the half- (For example, 2 Vf) of a forward voltage and a forward voltage applied to one half-wave emitting cell.

In addition, the half-wave light emitting cells (h ₁ to h ₈₎ of the case to be made of the same light-emitting diode, a reverse voltage is applied to each of these half-wave light-emitting cell is the number of propagating light emitting cells are connected between the half-wave light-emitting cells of two adjacent pairs Lt; / RTI > Accordingly, it is possible to provide a light emitting device which is safe to the reverse voltage by controlling the number of the light emitting cells connected in series between the two pairs of half wave emitting cells adjacent to each other. For example, the number of the series-connected light emitting cells is selected in consideration of the reverse voltage of the half-wave emitting cell, and may be selected in a range of preferably 1 to 10.

As described above, according to one embodiment of the present invention, the half wave light emission cells h ₁ to h ₈ and the wave propagation light cells a ₁ and a ₂ are adopted, and the number of the series- Thereby providing a light emitting device that is safe to the reverse voltage and can increase the use efficiency.

Hereinafter, an overcurrent phenomenon applied to a specific light emitting diode in operation of the light emitting device will be described with reference to FIG.

Referring to FIG. 4, the light emitting device 100 includes three pairs of semi-emissive cells 100 and two emissive cells 200 electrically connected by wiring on a single substrate.

That is, three pairs of half wave light emitting cells (i.e., half wave light emitting cells of the first row, the second row and the third row) are located between the nodes n ₁ and n ₃ , The terminals of the half-wave emitting cells are electrically connected to each other, and a pair of the half-wave emitting cells are electrically connected to each other and the terminals of the same polarity are connected to the other pair of half- And the opposite polarity.

Further, each of the propagation light-emitting cells is electrically connected to two pairs of half-wave light emission cells adjacent to each other. That is, one radiowave cell 200 is connected between the half-wave luminescent cell pairs of the first row and the second row, and another radiowave cell 200 ).

Here, the third terminal of the propagation light-emitting cells is electrically connected to the second terminal of the pair of half-wave-emission cells of the first row and the third row, respectively, while the fourth terminal of the propagation- And are electrically connected to the first terminals of the light emitting cells, respectively.

Further, the two end terminals of one pair of adjacent two pairs of half-wave emitting cells are electrically connected to the other end terminals of the other pair at the nodes n ₁ and n ₃ , respectively. For example, the second terminal of the half wave light emitting cells of the second row is electrically connected to the first terminal of the other half wave light emitting cells of the first row and the third row at the nodes (n ₁ , n ₃ ), respectively.

When so doing, the light emitting device 100 of FIG. 4, for example, when the positive voltage from the node (n ₁₎ side is applied, whereby the current from the node (n ₂₎ from the node (n ₁₎ And flows as indicated by a dotted line.

Specifically, for example, the node (n ₁₎ in the case between the flows and a current of 2i, the node (n _1), each connected to the first line and the second half-wave light-emitting cell and the respective propagation light emitting cell current i in the line for And the two current flows at the node n ₂ are combined so that a total of 2 i current flows in the half-wave emitting cell 100 of the second row electrically connected between the node n ₂ and the node n ₃ .

Therefore, when the light emitting device is constructed as in the configuration of Fig. 4, an overcurrent flows to a specific half wave light emitting cell (for example, half wave light emitting cell of the second row) at the time of driving the light emitting device, Is high.

On the other hand, light emission in accordance with an embodiment of the invention the device 1000 has a node (N ₂₎ (or the node (N2 ')), the half-wave light-emitting diode by a current flow to a plurality of the specific half-wave light-emitting diode in, as described above It is possible to prevent the overcurrent from flowing to the semiconductor device.

Hereinafter, a light emitting device 2000 according to another embodiment of the present invention will be described with reference to FIG. However, for the sake of simplicity of explanation, the description of the parts overlapping with the light emitting device 1000 will be omitted.

The light emitting device 2000 includes a plurality of semi-light emitting cells (h ₁ to h ₁₂ ; 100) and propagating light emitting cells (a ₁ to a ₄ ; 200). However, the light emitting device 1000 includes two wave emitting cells a ₁ and a ₂ and eight half wave emitting cells h ₁ to h ₈ , Cell and 12 half-wave emitting cells.

Specifically, the light emitting device 2000 includes a first light emitting cell group and a second light emitting cell group that is configured to correspond to the first light emitting cell group and both ends thereof are electrically connected to both ends of the first light emitting cell group, is the half-wave light emitting cells _{(h 1, h 2, h} 3, h 4, h 9, h 10) and propagating the light emitting cells (a _1, a _3), and the second light emitting cell group is half-wave light-emitting cell including (h ₅ , h ₆ , h ₇ , h ₈ , h ₁₁ , h ₁₂ ) and a light emitting cell (a ₂ , a ₄ ).

That is, unlike the first light emitting cell group of the light emitting device 1000, the first light emitting cell group of the light emitting device 2000 is divided into a half wave signal electrically connected to one end terminal of the pair of half wave light emitting cells h ₁ and h ₂ A half light emitting cell h ₁₀ electrically connected to one end terminal of the light emitting cell h ₉ and another pair of half light emitting cells h ₃ and h ₄ , Unlike between the second light emitting cell group of the radio wave emitting cells (a _3), further comprising, the light emitting device 1000 is electrically connected to (that is, the node N ₃ and N between ₇₎ and the of the light-emitting devices (2000) second light emitting cell group includes a pair half-wave light-emitting cells of (h _5, h ₆₎ half-wave light emitting cells electrically connected to one end terminal of the (h _11), one pair on one side of the half-wave light-emitting cell (h _7, h ₈₎ electrically opened to the end terminal electrically half-wave light-emitting cells ₍₁₂ h) is connected, and between the respective one terminal of the half-wave, two pairs of light emitting cells (that is, the node N ₃ 'and between ₈ N) The propagation light emitting cells (a ₄₎ may be further included.

The half-wave emitting cell h ₉ is electrically connected to the half-wave emitting cell h ₂ at the node N ₇ and the first terminals. The half-wave emitting cell h ₁₀ is electrically connected at the node N ₃ to the half- (h ₄₎ and the second being electrically connected to each other terminal, a half-wave light-emitting cell (h ₁₁₎ is electrically connected to the node (N ₃ ') the second terminal and the half-wave light-emitting cell (h ₆₎ from each other, a half-wave light-emitting cell ( h ₁₂ are electrically connected to the half-wave emitting cell h ₈ and the first terminals at the node N ₈ .

The third terminal of the propagation light emitting cells a ₃ and a ₄ is electrically connected to the second terminal of the adjacent half wave light emitting cells and the fourth terminal of the propagation light emitting cells a ₃ and a _{4 is} connected to the adjacent half- Lt; RTI ID = 0.0 > terminal < / RTI >

Further, by electrically connecting the node N ₂ and the node N ₂ 'and electrically connecting the node N ₃ and the node N ₃ ', the propagation light emission cell a ₁ and the propagation light emission cell a a ₂ ) may be electrically connected to each other through the fourth terminals, and the third terminal may be electrically connected to the propagation emission cell a ₃ and the propagation emission cell a ₄ .

The first propagation light emitting cell a ₁ from _one end (i.e., N ₁ node) of the first light emitting cell group and the first propagation light emitting cell a ₂ from _one end (i.e., N ₁ ' are the terminals of the same polarity to each other (e.g., the fourth terminals) is electrically connected to each other, the first end of the light emitting cell group, (that is, N _first nodes), the second radio wave emission cells (a ₃₎ and the second from (For example, third terminals) of the same polarity are electrically connected to each other from _one end (i.e., N ₁ 'node) of the light emitting cell group to the second light emitting cell a ₄ .

That is, the nth (n is a natural number) propagation light emitting cell from one end of the first light emitting cell group and the nth (n is a natural number) propagation light emitting cell from one end of the second light emitting cell group are connected to each other And are electrically connected to each other.

In this case, when AC power is applied to the terminals t ₁ and t ₂ of the light emitting device 2000, the luminous efficiency of the light emitting device 2000 in each of the first and second periods is 10/16 = 62.5% .

In FIG. 5, the current flow in the first period is indicated by a dotted line. When a current of 2i flows through the terminal t ₁ , the current flowing through each of the light emitting diodes on the current flow path is i same. In contrast, if via the terminal in the second period (t ₂₎ from entering a current of 2i flows similarly the light emitting diodes flows to the current i.

Therefore, in the light emitting device 2000 according to another embodiment of the present invention, it is possible to increase the use efficiency of the light emitting device while preventing the over current from flowing to the specific light emitting diode during the operation of the light emitting device 2000.

Hereinafter, a light emitting device 3000 according to another embodiment of the present invention will be described with reference to FIG. However, for the sake of simplicity of explanation, a description of a part overlapping with the light emitting device 1000 or 2000 will be omitted.

The light emitting device 3000 includes a plurality of semi-light emitting cells 100 and the light emitting cells 200 electrically connected by wiring on a single substrate in a manner similar to the light emitting device 1000 or 2000. However, unlike the light emitting device 2000, the light emitting device 3000 differs in that it includes six wave emitting cells and sixteen half wave emitting cells.

Specifically, the light emitting device 3000 includes a first light emitting cell group and a second light emitting cell group that is configured to correspond to the first light emitting cell group and both ends thereof are electrically connected to both ends of the first light emitting cell group, comprises the half-wave light-emitting cell _{(h 1, h 2, h} 3, h 4, h 9, h 10, h 13, h 14) and propagating the light emitting cells _{(a 1, a 3, a} 5), and wherein The two light emitting cell groups include the half wave light emitting cells (h ₅ , h ₆ , h ₇ , h ₈ , h ₁₁ , h ₁₂ , h ₁₅ and h ₁₆ ) and the light emitting cells a ₂ , a ₄ and a ₆ can do.

Here, each of the half-wave light emission cells h ₁₃ and h ₁₄ of the first light emission cell group is electrically connected to each of the half-wave light emission cells h ₉ and h ₁₀ having the same polarity (for example, the second terminals) And each of the half-wave emitting cells h ₁₅ and h ₁₆ of the second light emitting cell group is connected to each of the half-wave emitting cells h ₁₁ and h ₁₂ of the same polarity (for example, first terminals) do. Further, the radio wave emitting cell a ₅ is electrically connected to two pairs of adjacent half wave light emitting cells between the nodes N ₄ and N ₁₀ and the radio wave emitting cell a _{6 is} connected to the nodes N ₄ ' _{RTI ID = 0.0} > ₁₁ , < / RTI >

The third terminal of the propagation light emitting cells a ₅ and a ₆ is electrically connected to the second terminal of the adjacent half wave light emitting cells and the fourth terminal of the propagation light emitting cells a ₅ and a _{6 is} connected to the adjacent half- Lt; RTI ID = 0.0 > terminal < / RTI >

A node (N ₂₎ and a node (N ₂ ') for electrically connecting and node (N ₃₎ and a node (N _3') to and electrically connected to a node (N ₄₎ and a node (N ₄ ') The fourth terminals are electrically connected to each other and the propagation emission cell a ₃ and the propagation emission cell a ₄ are electrically connected to each other by electrically connecting the propagation emission cell a ₁ and the propagation emission cell a ₂ , 3 terminals are electrically connected to each other, and the fourth terminal may be electrically connected to the propagation emission cell a ₅ and the propagation emission cell a ₆ .

That is, unlike the first light emitting cell group of the light emitting device 2000, the first light emitting cell group is half-wave light-emitting cell (h _9, h ₁₀₎ and the half-wave electrically connected between terminals of the same polarity light emitting each light emitting device (3000) cells (h _13, h ₁₄₎ and nodes (N ₄ and N ₁₀₎ further comprises a radio wave emitting cells (a ₅₎ electrically coupled between and, unlike the second light emitting cell group of the light emitting device 2000, the light emitting The second light emitting cell group of the device 3000 includes half emissive cells h ₁₅ and h ₁₆ electrically connected to terminals having the same polarity as half emissive cells h ₁₁ and h ₁₂ and nodes N ₄ ' the spread light emitting cells (a ₆₎ electrically coupled between ₁₁₎ may further include.

In addition, the first end of the light emitting cell group, (that is, N _first nodes), the first propagation light emitting cells (a ₁₎ and the second light emitting cell group once (i.e., N ₁ 'node), the first propagation light emitting cells from (a from ₂₎ among the fourth terminals are electrically connected to each other, first the second radio wave emission cells (a of the light emitting cell group ₃₎ and the second second radio wave emission cells (a _fourth of the light emitting cell group) is a third terminal to each other And the third terminal of the first light emitting cell group a ₅ and the third terminal of the second light emitting cell group a ₆ are electrically connected to each other.

That is, the nth (n is a natural number) propagation light emitting cell from one end of the first light emitting cell group and the nth (n is a natural number) propagation light emitting cell from one end of the second light emitting cell group are connected to each other And are electrically connected to each other.

In this case, when AC power is applied to the terminals t ₁ and t ₂ of the light emitting device 3000, the luminous efficiency of the light emitting device 3000 in each of the first and second periods is about 63.6% Lt; / RTI >

In FIG. 6, the current flow in the first period is indicated by a dotted line. When a current of 2i flows through the terminal t ₁ , the current flowing through each of the light emitting diodes on the current flow path is i same. In contrast, if via the terminal in the second period (t ₂₎ from entering a current of 2i flows similarly the light emitting diodes flows to the current i.

Therefore, in the light emitting device 3000 according to another embodiment of the present invention, it is possible to further increase the luminous efficiency while preventing the over current from flowing to the specific light emitting diode during the operation of the light emitting device 3000.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Therefore, it should be understood that the above-described embodiments are not intended to limit the scope of the present invention, but merely to facilitate a better understanding thereof. The scope of the present invention is not limited by these embodiments, but should be construed according to the following claims, and technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

100: Half wave light emitting cell
200: a light emitting cell
1000, 2000: Light emitting device

Claims (6)

A light emitting device comprising a plurality of light emitting cells formed on a single substrate,
A first light emitting cell group, and a second light emitting cell group corresponding to the first light emitting cell group, wherein each of the first and second light emitting cell groups includes:
Each pair of terminals of the same polarity includes two half-wave emitting cells electrically connected to each other, and a pair of terminals of the same polarity electrically connected to each other are connected to a pair of terminals of the same polarity electrically connected to each other, At least two pairs of half-wave emitting cells; And
And at least one light emitting cell electrically connected to two adjacent pairs of half wave light emitting cells,
Each of the half wave light emitting cells has a first terminal and a second terminal, and the wave emitting cells have a third terminal having the same polarity as the first terminal and a fourth terminal having the same polarity as the second terminal,
Each of the terminals of the propagation light emitting cells is electrically connected to the terminals of the same polarity electrically connected to each other of the half-wave emitting cells, the third terminal is connected to the second terminal, Terminal,
The nth propagation light emitting cell from one end of the first light emitting cell group and the nth propagation light emitting cell from one end of the second light emitting cell group are electrically connected to each other with terminals having the same polarity,
Wherein n is a natural number. The light emitting device of claim 1, wherein the one end of the first light emitting cell group and the one end of the second light emitting cell group are electrically connected to each other. The organic light emitting display according to claim 1, wherein each of the first and second light emitting cell groups includes:
Two pairs of half wave light emitting cells and one full wave light emitting cell. [Claim 4] The organic light emitting display of claim 3, further comprising: a node in which a pair of half-emission cells of the two pairs of half-emission cells of the first emission cell group are commonly connected; And the nodes to which the pair of half-wave emitting cells are commonly connected are electrically connected to each other. 5. The light emitting device according to claim 4, wherein the polarity of the terminal of the half-emissive cells connected to the node of the first light emitting cell group is the same as the polarity of the terminal of the semi-emissive cells connected to the node of the second light emitting cell group. 4. The light emitting device of claim 3, wherein each of the first and second light emitting cell groups includes:
Half emissive cells electrically connected to one end of each of the two half-wave emitting cells, and terminals of the same polarity are electrically connected to the one end terminal; And
Further comprising a light emitting cell electrically connected between the one end terminal of each of the two pairs of half wave light emitting cells,
And the third terminal is connected to the second terminal and the fourth terminal is electrically connected to the first terminal, the third terminal being electrically connected to the first terminal.

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