KR101777285B1 - Circuit board comprising emitting elements and display apparatus comprising the circuit board - Google Patents

Abstract

A circuit board and a display device including a light emitting element are provided. The circuit board includes a substrate, a plurality of light emitting devices arranged substantially in a line on the substrate, and N different wirings (N is a natural number of 2 or more) connecting the light emitting devices of a part of the plurality of light emitting devices in series, , One branch wiring among the N branch wirings is formed in another region on the same plane with the remaining N-1 branch wirings, and the other N -1 branch wirings are not formed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a circuit board including a light emitting element,

The present invention relates to a circuit board and a display device including a light emitting element.

In recent years, light emitting diode devices (hereinafter referred to as LEDs) have been increasingly utilized as light sources in many fields due to their advantages such as low power consumption under the same luminance condition, life span and high color reproducibility. For example, in the field of display, the advantage of such an LED is in line with the direction of the product, so the demand and production of the product adopting the LED element is increasing.

In the case of a liquid crystal display (LCD), a separate light source is required because it can not self-emit light. Accordingly, the liquid crystal display device is provided with a backlight unit at a lower portion of the liquid crystal display panel, and displays an image using the light emitted from the backlight unit. Recently, a light emitting diode (LED) has been spotlighted as a light source of such a backlight unit.

On the other hand, the backlight unit can constitute a part of the circuit board by mounting a plurality of light emitting diodes on a circuit board, wherein a predetermined number of light emitting diodes constitute one block, and a predetermined number of light emitting diodes . One of the mutually connected blocks may be supplied with power for driving the light emitting diodes and the other may be the feedback node to the light emitting diode control unit. In this case, the wiring for connecting one block on the circuit board and the wiring for connecting other blocks are prevented from intersecting each other. The printed circuit board has a plurality of layers. A circuit board composed of a plurality of layers has a higher unit price than a printed circuit board composed of one layer.

A problem to be solved by the present invention is to provide a circuit board capable of reducing the production cost.

Another object to be solved by the present invention is to provide a display device including the circuit board.

According to an aspect of the present invention, there is provided a circuit board comprising a substrate, a plurality of light emitting elements arranged substantially in a line on the substrate, and a plurality of light emitting diodes of the plurality of light emitting elements, (N is a natural number of 2 or more), the N branch wirings are formed on the same plane on the substrate, and one branch wiring among the N branch wirings is connected to the remaining N-1 branch wirings and the N- And the remaining N-1 branch wirings are not formed in a region perpendicular to the same plane of the region where the branch wirings are formed. The first group of the plurality of branch wirings is located on one side of the line, the second group of the branch lines is located on the other side of the line, and the first group and the second group At least one branch wiring may connect two non-adjacent light emitting elements among the plurality of light emitting elements.

According to another aspect of the present invention, there is provided a display device including a display panel, a plurality of light emitting elements mounted on the substrate such that at least one light emitting element is connected to an internal wiring on the substrate, (N is a natural number of 2 or more) connected in series with the light emitting diodes of a part of the plurality of light emitting devices, and a backlight unit N branch wirings are formed on the same plane on the substrate, one branch wiring among the N branch wirings is formed in the remaining N-1 branch wirings and another region on the same plane, and the branch wirings are formed The remaining N-1 branch wirings are not formed in a region perpendicular to the same plane of the region to be formed. The first group of the plurality of branch wirings is located on one side of the line, the second group of the branch lines is located on the other side of the line, and the first group and the second group At least one branch wiring may connect two non-adjacent light emitting elements among the plurality of light emitting elements.

According to the circuit board and the display device according to the embodiments of the present invention, a single-layer substrate can be used in a system in which a light emitting diode is mounted on a plurality of circuit boards while maintaining luminance uniformity of a light source composed of light emitting diode elements Thereby lowering the unit cost of the substrate and the product, thereby lowering the cost of the entire product comprising the substrate on which the light emitting diode is mounted.

FIG. 1 is a circuit diagram for explaining a plurality of light emitting devices arranged on a circuit board according to an embodiment of the present invention and its connection relationship. FIG.
Figure 2 illustrates an exemplary circuit board that implements the circuit diagram of Figure 1;
3 is a circuit diagram for explaining a plurality of light emitting devices arranged on a circuit board according to another embodiment of the present invention and its connection relationship.
Figure 4 illustrates an exemplary circuit board that implements the circuit diagram of Figure 3;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely. In the drawings, the thickness is enlarged to clearly illustrate the various layers and regions, and the same reference numerals denote the same elements in the drawings. Also, where a section such as a layer, film, region, plate, or the like is referred to as being "on top" or "on" another section, not only when each section is "directly above" And includes another portion between the other portions.

One element is referred to as being "connected to " or" coupled to "another element, either directly connected or coupled to another element, One case. On the other hand, when one element is referred to as being "directly connected to" or "directly coupled to " another element, it does not intervene another element in the middle. Like reference numerals refer to like elements throughout the specification. "And / or" include each and every combination of one or more of the mentioned items.

Although the first, second, etc. are used to describe various elements, components and / or sections, it is needless to say that these elements, components and / or sections are not limited by these terms. These terms are only used to distinguish one element, element or section from another element, element or section. Therefore, it goes without saying that the first element, the first element or the first section mentioned below may be the second element, the second element or the second section within the technical spirit of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

FIG. 1 is a circuit diagram for explaining a plurality of light emitting devices arranged on a circuit board according to an embodiment of the present invention and its connection relationship. FIG. Figure 2 illustrates an exemplary circuit board that implements the circuit diagram of Figure 1;

First, referring to FIG. 1, a plurality of light emitting devices are shown and all M (M is a natural number of 2 or more, for example, M in the embodiment of FIG. The light emitting device may be a light emitting diode or a chip.

The M light emitting devices are connected in series to M / Q (where N is a natural number of 2 or more, Q is 4 in the embodiment of FIG. 1, and thus M / Q is 8 in the embodiment of FIG. 1) 504 are formed. The branch wirings are connected to the power supply wirings 31 in one end direction and connected to the feedback wirings 401 to 404 in opposite ends of the one end of the branch wirings, respectively. 1, one feedback wiring may be connected to one branch wiring or may be connected to two or more branch wiring (refer to FIG. 3 or FIG. 4). The feedback wirings 401 to 404 may be used to control an electrical signal to be transmitted to the power supply wiring by transmitting an electrical signal of the feedback signal to a control unit (not shown in the drawing) for controlling the light emitting element.

The light emitting devices may be configured as a light source of a display device (e.g., a liquid crystal display device), and may constitute a part of a backlight unit for supplying light to the display device.

Here, since FIG. 1 is a circuit diagram (or a conceptual diagram) for showing the connection state of the light emitting devices, the actual arrangement of the actual light emitting devices may not be a matrix form as shown in FIG.

On the other hand, the plurality of light emitting elements shown in Fig. 1 may be arranged substantially in a substantially substantially line-like manner as shown in Fig. The method for arranging in a row may be arranged in a line, for example, along a placement order path 61 shown by a dotted line.

1 and 2, starting from the light emitting element LED_01 of the first branch wiring 501, the light emitting element LED_02 of the second branch wiring 502, the third branch wiring 503 (LED_03) of the fourth branch wiring 504, and a light emitting element (LED_04) of the fourth branch wiring 504 in this order. Next, the light emitting element (LED_05) of the fourth branch wiring 504, the light emitting element (LED_06) of the third branch wiring 503, the light emitting element (LED_07) of the second branch wiring 502, ) LEDs (LED_08).

In an embodiment of the present invention, in order to arrange the circuit board so as to have a single layer without having a plurality of layers, care should be taken in wiring configuration.

If there are N kinds of wirings (N is a natural number of 2 or more) connecting the light emitting elements of a part of the plurality of light emitting elements (LED_01 to LED_20 of FIG. 2) in series, N kinds of wirings are formed on the same plane on the substrate 101 One branch wiring out of the N branch wirings is formed in another area on the same plane as the remaining N-1 branch wirings, and the remaining N-1 branches are formed in the same area on the same plane of the area where one branch wiring is formed Wiring is not formed. That is, the branch lines are not formed of a plurality of layers but may be formed of a single layer.

For example, the wiring can be positioned as follows. A plurality of light emitting elements (LED_01 to LED_20 in FIG. 2) arranged substantially in a line can be divided into a plurality of light emitting groups. Here, each light emitting group may include a plurality of neighboring light emitting elements, for example, a plurality of light emitting groups may include immediately adjacent first and second light emitting groups, LED_01 to LED08, and the second light emitting group may include LED_09 to LED_16.

The light emitting elements (for example, LED_01, LED_08) in the first light emitting group are connected to branch wirings 514 located at one side (for example, in the downward direction in Fig. On the other hand, the light emitting element (for example, LED_07) in the first light emitting group and the light emitting element (for example, LED_10 in the second light emitting group) And is connected to the branch wiring 515 located at the bottom.

The positions of the branch wires used for connecting the light emitting elements belonging to the same light emitting group and the light emitting elements belonging to another light emitting group are different from each other (that is, the lower direction in the case of the same light emitting group and the upper direction in the case of the other light emitting group) It is possible to prevent twisting of branch wiring. Thus, a circuit board composed of a single layer can be formed.

More specifically, it is as follows.

When K (K is a natural number) light emitting element among the plurality of light emitting elements (LED_01 to LED_20) is connected in series through a K + 2N + 1th (where N is a natural number) + L (where L is a natural number greater than or equal to 1 and equal to or smaller than N) light emitting devices may be connected in series through the (K + 2N + 1-L) th light emitting device and branch wiring.

Referring to FIG. 2, for example, K = 1, N = 3, and L = 1 to 3 are as follows. If the first light emitting device LED_01 and the eighth light emitting device LED_08 are connected in series through the branch wiring lines 514, the second light emitting device LED_02 is connected to the third wiring And the third light emitting device LED_03 may be connected in series through the branch wirings 512. The fourth light emitting device LED_04 may be connected in series through the branch wiring 512, (LED_05) may be connected in series through branch wires 511. [ In particular, branch lines 511 to 514 are located on the same side (for example, lower side) about the above-mentioned line.

If the (K + 2N + 1) th light emitting device is connected in series with the (K + 2N + 2) th light emitting device, Can be connected in series through the fifth wiring.

Referring to FIG. 2, for example, K = 1, N = 3, and L = 1 to 3 are as follows. If the eighth light emitting device LED_08 and the ninth light emitting device LED_09 are connected in series through the branch wires 516, the seventh light emitting device LED_07 may be connected to the third light emitting device 515 and the sixth light emitting device LED_06 may be connected in series through the branch wiring 517 and the fifth light emitting device LED_05 may be connected in series through the branch wiring 517. [ Th light emitting device LED_12 may be connected in series through branch wirings 518. [ The branch wirings 515, 517, and 518 may be located on the other side (that is, the upper side and the lower side) about the center line of the branch wirings 511 to 514.

The substrate 101 is not limited in form and material, and may be, for example, a printed circuit board (PCB), or a flexible printed circuit (FPC).

3 is a circuit diagram for explaining a plurality of light emitting devices arranged on a circuit board according to another embodiment of the present invention and its connection relationship. Figure 4 illustrates an exemplary circuit board that implements the circuit diagram of Figure 3;

First, referring to FIG. 3, a plurality of light emitting devices are shown and all M (M is a natural number of 2 or more, for example, M is 32 in the embodiment of FIG. The light emitting device may be a light emitting diode or a chip.

In the embodiment of FIG. 3, the M light emitting devices are connected in series to form N pieces of wirings 521 - 524 are formed. The branch wirings are connected to the power supply wirings 42 in one end direction and are connected to the feedback wirings 421 and 422 in the opposite end directions of the other ends of the branch wirings, respectively. As shown, the feedback wirings 421 and 422 may be connected to two or more branch wirings. The feedback wiring lines 421 and 422 may be used to control an electrical signal to be transmitted to the power wiring by transmitting an electrical signal of the feedback signal to a control unit (not shown in the figure) for controlling the light emitting element.

The light emitting devices may be configured as a light source of a display device (e.g., a liquid crystal display device), and may constitute a part of a backlight unit for supplying light to the display device.

Here, since FIG. 3 is a circuit diagram (or a conceptual diagram) for showing the connection state of the light emitting devices, the actual arrangement of the actual light emitting devices may not be a matrix form as shown in FIG.

On the other hand, the plurality of light emitting elements shown in Fig. 3 may be arranged substantially in a substantially substantially line-like manner as shown in Fig. The method for arranging in a row can be arranged in a line, for example, along the arrangement order path 62 shown by the dashed lines.

3 and 4, starting from the light emitting element LED_01 of the first branch wiring 521, the light emitting element LED_02 of the second branch wiring 522, the third branch wiring 523 (LED_03) of the fourth branch wiring 524, and a light emitting element (LED_04) of the fourth branch wiring 524 in this order. Next, the light emitting element (LED_05) of the first branch wiring 521, the light emitting element (LED_06) of the second branch wiring 522, the light emitting element (LED_07) of the third branch wiring 523, ) LEDs (LED_08).

In an embodiment of the present invention, in order to arrange the circuit board so as to have a single layer without having a plurality of layers, care should be taken in wiring configuration.

For example, you can place the wiring as follows.

The (K + 1) -th light emitting device is connected in series through a K + P (where P is a natural number of 4 or more) light emitting devices and a branch wiring among the plurality of light emitting devices, Th light emitting device and the branch wiring, the branch wiring structure is as follows. Branch wires connecting the (K + 1) th and (K + P) th light emitting devices are located on one side of the row, and branch wires connecting the (K + P + 1) th light emitting device in the other direction of the row, passing between the (K + P) th light emitting device and the (K + P-1) th light emitting device.

Referring to FIG. 4, for example, K = 1 and P = 4 are as follows. The first light emitting device LED_01 and the fifth light emitting device LED_05 are connected in series through branch wires 534 and the second light emitting device LED_02 and the sixth light emitting device LED_06 are connected in series through the wirings 533). At this time, the branch wirings 534 are located on one side (for example, the lower side) of the row, the branch wirings 533 extend from the second light emitting element LED_02 to one side (for example, May be connected to the sixth light emitting device LED_06 from the other side (e.g., upper side) of the row through the fifth light emitting device LED_05 and the fourth light emitting device LED_04.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

101, 102: circuit board
401 to 404, 421 to 422: feedback wiring
501 to 504, 511 to 518, 521 to 524, and 531 to 534:
61, 62: Batch order path

Claims (14)

Board;
A plurality of light emitting elements arranged substantially in a line on the substrate; And
And a plurality of branch wirings for connecting some of the plurality of light emitting elements in series,
Wherein a first group of the plurality of branch wirings is located at one side with respect to the one row, a second group of the plurality of branch wirings is located at the other side with respect to the row,
Wherein at least one branch wiring in the first group connects two non-adjacent light emitting elements among the plurality of light emitting elements,
Wherein at least one branch wiring in the second group connects two non-adjacent light emitting elements among the plurality of light emitting elements,
Wherein when the three light emitting elements among the plurality of light emitting elements are serially connected in series through two of the plurality of branch wirings, the two branch wirings are located on different sides with respect to the series. The circuit board according to claim 1, wherein the light emitting device is a light emitting diode device. The circuit board according to claim 1, wherein the substrate is formed as a single layer. The method according to claim 1,
Wherein the plurality of light emitting elements arranged in a substantially line are divided into a plurality of light emitting groups, and when each of the light emitting groups includes a plurality of neighboring light emitting elements successively,
Wherein the plurality of light emitting groups include immediately adjacent first light emitting groups and second light emitting groups,
The first and second light emitting elements in the first light emitting group are connected by a first branch wiring located at one side of the column,
Wherein the first light emitting element in the first light emitting group and the third light emitting element in the second light emitting group are connected to a second branch wiring located on the other side of the column. The method according to claim 1,
When the Kth light emitting element among the plurality of light emitting elements is serially connected through the (K + 2N + 1) th light emitting element (where N is a natural number) and the third branch wiring,
(K + 2N + 1-L) -th light emitting device and the fourth branch wiring through a K + L (where L is a natural number equal to or greater than 1 and equal to or smaller than N) Board. 6. The method of claim 5,
And said third branch wiring and said fourth branch wiring are located on the same side with respect to said row. The circuit board according to claim 1, wherein a power supply line for supplying power to the light emitting device is formed, and one end of the plurality of branch lines is connected to the power supply line. The circuit board according to claim 7, wherein a feedback wiring is formed, and an opposite end portion of one end portion of the plurality of branch wirings connected to the power supply wiring is connected to the feedback wiring for controlling an electrical signal. Display panel; And
And a backlight unit including a plurality of light emitting elements mounted so that at least one light emitting element is connected to an internal wiring on the substrate to supply light to the display panel,
Wherein the plurality of light emitting elements are arranged substantially in a line on the substrate,
And a plurality of branch wirings for connecting some of the plurality of light emitting elements in series,
Wherein a first group of the plurality of branch wirings is located at one side with respect to the one row, a second group of the plurality of branch wirings is located at the other side with respect to the row,
Wherein at least one branch wiring in the first group connects two non-adjacent light emitting elements among the plurality of light emitting elements,
Wherein at least one branch wiring in the second group connects two non-adjacent light emitting elements among the plurality of light emitting elements,
Wherein when the three light emitting elements among the plurality of light emitting elements are serially connected in series through two of the plurality of branch wirings, the two branch wirings are positioned on different sides with respect to the center line. 10. The display device according to claim 9, wherein the light emitting element is a light emitting diode element. The display device according to claim 9, wherein the substrate is formed as a single layer. 10. The method of claim 9,
Wherein the plurality of light emitting elements arranged in a substantially line are divided into a plurality of light emitting groups, and when each of the light emitting groups includes a plurality of neighboring light emitting elements successively,
Wherein the plurality of light emitting groups include immediately adjacent first light emitting groups and second light emitting groups,
The first and second light emitting elements in the first light emitting group are connected by a first branch wiring located at one side of the column,
Wherein the first light emitting element in the first light emitting group and the third light emitting element in the second light emitting group are connected by a second branch wiring located on the other side of the column. 10. The light emitting device according to claim 9, wherein, when the Kth light emitting device among the plurality of light emitting devices is serially connected through the (K + 2N + 1)
(K + 2N + 1-L) -th light emitting device and the fourth branch wiring through a K + L (where L is a natural number equal to or greater than 1 and equal to or smaller than N) Device. 14. The method of claim 13,
And the third branch wiring and the fourth branch wiring are located on the same side with respect to the series.

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