JP2012048964A - Led backlight unit, led module for lighting device, liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a general purpose LED backlight unit capable of being used irrespective of a size of a liquid crystal panel.SOLUTION: The LED backlight unit is provided with a plurality of LED boards 10A and one LED board 10B. The LED board 10A is mounted with a plurality of LED elements 31 connected in series between terminals 51 and 53 in a long side direction of the LED board 10A, and a terminal 55 and a terminal 57 are short-circuited. The LED board 10B is mounted with a plurality of LED elements 31 connected in series each between terminals 61 and 67 and terminals 65 and 63 in a long side direction of the LED board 10B. The terminals 61 and 63 and the terminals 65 and 67 are electrically separated each other. Since a connector 25 is engaged into connectors 21 which are provided in both of the neighboring boards, a connection between the neighboring boards is secured.

Description

  The present invention relates to an LED backlight unit that illuminates a liquid crystal panel or the like from behind and an LED module for an illumination device. Moreover, it is related with the liquid crystal display device provided with this LED backlight unit.

  The LED backlight unit is used as a light source such as a liquid crystal panel. Among these, the edge type LED backlight unit realizes a liquid crystal display by arranging an LED substrate on the peripheral portion of a light guide plate arranged on the back surface of the liquid crystal panel and guiding emitted light from the LED from the light guide plate to the liquid crystal panel. It is a structure (for example, refer patent document 1). Since the LED substrate is disposed on the peripheral portion of the light guide plate, there is an advantage that the liquid crystal display device can be made thinner than a direct type in which the LED substrate is disposed directly under the liquid crystal panel. In recent years, edge type LED backlight units have also been adopted as backlights for liquid crystal televisions.

  FIG. 12 is a schematic configuration diagram of a conventional edge type backlight unit 100. 101 is an LED substrate, 103 is a liquid crystal panel, and 105 is a connector. A light guide plate (not shown) for guiding the radiated light from the LED substrate 101 to the liquid crystal panel 103 is disposed on the back surface of the liquid crystal panel 103.

  As shown in FIG. 12, in the case of the edge type backlight unit, the LED substrate is arranged on the peripheral portion of the light guide plate arranged on the back surface of the liquid crystal panel, so the configuration of the LED substrate changes according to the size of the liquid crystal panel. . For example, in order to use as a backlight unit for a large-screen liquid crystal television, the LED substrate 101 also needs to be enlarged in accordance with the size of the liquid crystal panel 103 for the liquid crystal television.

  Such a problem also applies to a lighting device using LEDs. That is, it is assumed that the size of the annular or straight tube type LED lighting device is changed according to the user's request. In such a case, it is necessary to change and provide the size of the LED module used for the light source unit according to the desired size of the lighting device.

JP 2004-79488 A

  As described above, in the case of the conventional edge type backlight unit, it is necessary to make LED substrates according to the size of the liquid crystal panel to be mounted, which is inefficient in production. This point has the same problem even in an illumination device using an LED module in the light source unit.

  In view of the above problems, the present invention has an object to realize a general-purpose LED backlight unit that can be used regardless of the size of a liquid crystal panel.

  Another object of the present invention is to realize a general-purpose LED module for a lighting device that can be used regardless of the size of the lighting device.

In order to achieve the above object, the LED backlight unit according to the present invention includes:
An LED backlight unit in which a plurality of LED substrates on which a plurality of LED elements are mounted along a long side direction on a rectangular substrate surface is arranged in the long side direction,
The plurality of LED substrates are:
Each has first and second terminals along the first short side, and third and fourth terminals along the second short side, and the first short side and the second short side are adjacent to each other. The first terminals and the third terminals formed along the opposing short sides of the substrates to be electrically connected to each other, and the second terminal and the fourth terminal, respectively,
Among the first terminal and the third terminal and between the second terminal and the fourth terminal, one of the plurality of LED elements is connected in series with a common rectifying direction, and the other is short-circuited. One or more first LED substrates;
The first terminal and the second terminal, and the third terminal and the fourth terminal are electrically connected to each other, and at least between the first terminal and the second terminal, or the third terminal and the A plurality of LED elements includes a second LED substrate connected in series with a common rectification direction between the fourth terminals.

  In particular, in the case of a configuration having a plurality of the first LED substrates, the second LED substrates are arranged adjacent to each other so as to be sandwiched between the two first LED substrates, and a plurality of LED elements mounted on the second LED substrates. Are connected in series with a plurality of LED elements mounted on the adjacent first LED substrates in common with the rectifying direction.

  According to the above configuration, the two first LED boards are arranged so as to sandwich the second LED board, and the number of the first LED boards corresponding to the size of the liquid crystal panel is further appropriately connected to the outside of the first LED boards. be able to.

  That is, if two types of substrates, a first LED substrate and a second LED substrate, are prepared in advance, an LED backlight unit applicable to any size liquid crystal panel can be realized. For this reason, it is not necessary to change the design according to the size of the liquid crystal panel, and productivity is improved.

  Moreover, when comprised in this way, when a some LED board is arrange | positioned in a long side direction, two sets of series circuits are comprised by making a 2nd LED board into a boundary. Therefore, since a separate drive circuit can be provided for each series circuit, the voltage required for power supply can be reduced so that the boost limit is not exceeded.

  In the above configuration, it is also preferable to use two or more types of LED substrates having different long sides as the plurality of first LED substrates.

  By adopting such a configuration, it is possible to finely adjust the lengths in the long side direction of the plurality of LED substrates according to the size of the liquid crystal panel.

In addition to the above features, the LED backlight unit according to the present invention is configured such that the plurality of LED substrates are electrically connected to the outside along the first short side and the second short side on the substrate surface. A first connector for forming
Two housing portions and their housings for each of the first connectors formed along one of the opposing first short sides and the other second short side of two adjacent LED substrates By fitting the two housing parts of the second connector comprising a housing connection part that physically and electrically connects the parts from above, the first terminal and the third terminal between the adjacent LED boards, The second terminal and the fourth terminal are electrically connected to each other.

  With this configuration, electrical connection between adjacent substrates can be easily formed. In particular, since the connectors are fitted together, it is possible to form an electrical connection between the substrates even after each LED substrate is fixed to the housing.

  Moreover, even after the electrical connection between adjacent substrates is once formed, the electrical connection can be easily eliminated by removing the second connector. For this reason, after an adjacent board | substrate is electrically connected, when generation | occurrence | production of a malfunction can be confirmed, it becomes possible to replace | exchange for LED board unit, and maintenance efficiency improves.

  In the above configuration, it is preferable that the second connector is configured to be capable of extending and contracting at least in the separating direction of the two housing portions.

  By setting it as this structure, even if it is a case where a LED board produces thermal expansion, the electrical connection of adjacent board | substrates can be ensured continuously.

In the LED backlight unit according to the present invention, each of the first LED board and the second LED board may include a plurality of the first terminals and one second terminal along the first short side. A plurality of third terminals and one fourth terminal are provided along the short side, and the first short side and the second short side are opposed to each other and adjacent to each other along the opposed short side. Each of the first terminals and the third terminals formed at positions facing each other, and the second terminal and the fourth terminal are electrically connected to each other,
In the first LED board, a plurality of LED elements are connected in series with a common rectifying direction between the first terminals and the third terminals located in the long side direction, and the second terminals and the third terminals The fourth terminal is short-circuited,
The second LED substrate is electrically connected to the first terminals and the second terminals, and the third terminals and the fourth terminals, and at least the first terminals and the second terminals. A plurality of LED elements are connected in series with a common rectifying direction between each of the third terminals and the fourth terminal.

  By setting it as this structure, the backlight of the aspect which has the structure by which the some LED element was connected in series by multiple rows is realizable. Also in this case, an LED backlight unit applicable to any liquid crystal panel can be realized by providing a plurality of first LED substrates and arranging the second LED substrate so as to be sandwiched between the two first LED substrates.

  The LED backlight unit having the above features can be used for either a direct type or an edge type. When used as an edge-type LED backlight unit, a plurality of LED substrates provided in the LED backlight unit are arranged along at least a part of the peripheral portion of the light guide plate installed on the back surface of the liquid crystal panel. A display device is realized. At this time, the emitted light from the plurality of LED elements mounted on the LED substrate is guided to the liquid crystal panel through the light guide plate.

Further, the LED module for lighting device according to the present invention includes a plurality of LED substrates in which a plurality of LED elements are mounted along the long side direction in a straight tube type LED lighting device casing. An LED module for a lighting device,
The plurality of LED substrates are:
Each has first and second terminals along the first short side, and third and fourth terminals along the second short side, and the first short side and the second short side are adjacent to each other. The first terminals and the third terminals formed along the opposing short sides of the substrates to be electrically connected to each other, and the second terminal and the fourth terminal, respectively,
Among the first terminal and the third terminal and between the second terminal and the fourth terminal, one of the plurality of LED elements is connected in series with a common rectifying direction, and the other is short-circuited. One or more first LED substrates;
The first terminal and the second terminal, and the third terminal and the fourth terminal are electrically connected to each other, and at least between the first terminal and the second terminal, or the third terminal and the A plurality of LED elements includes a second LED substrate connected in series with a common rectification direction between the fourth terminals.

Moreover, the LED module for an illuminating device according to the present invention includes an arc-shaped LED substrate in which a plurality of LED elements are mounted along a long side direction indicating an arc shape in a circular tube-shaped LED illuminating device housing. A plurality of LED modules for a lighting device arranged in the long side direction,
The plurality of LED substrates are:
Each has first and second terminals along the first short side, and third and fourth terminals along the second short side, and the first short side and the second short side are adjacent to each other. The first terminals and the third terminals formed along the opposing short sides of the substrates to be electrically connected to each other, and the second terminal and the fourth terminal, respectively,
Among the first terminal and the third terminal and between the second terminal and the fourth terminal, one of the plurality of LED elements is connected in series with a common rectifying direction, and the other is short-circuited. One or more first LED substrates;
The first terminal and the second terminal, and the third terminal and the fourth terminal are electrically connected to each other, and at least between the first terminal and the second terminal, or the third terminal and the A plurality of LED elements includes a second LED substrate connected in series with a common rectification direction between the fourth terminals.

  According to the present invention, a highly versatile LED backlight unit independent of the size of the liquid crystal panel can be realized.

  Moreover, according to this invention, the LED module for illuminating devices with high versatility independent of the magnitude | size of an illuminating device is realizable.

Schematic configuration diagram of an edge type backlight unit of the present invention Conceptual diagram for explaining a method of connecting adjacent LED substrates Schematic configuration diagram of LED board with heat spreader mounted The schematic block diagram of the LED board with which the edge type backlight unit of this invention is provided Another configuration example of LED board group Another configuration example of LED board Another conceptual diagram for explaining a method of connecting adjacent LED substrates Another configuration example of LED board Another configuration example of LED board Another configuration example of LED board Schematic block diagram of LED module for lighting device of the present invention Schematic configuration diagram of a conventional edge type backlight unit

  FIG. 1 is a schematic configuration diagram of an edge type backlight unit of the present invention. The backlight unit 1 of the present invention is realized by connecting a necessary number of standardized LED substrates 10 in series according to the size of the liquid crystal panel 15. 21 and 23 are connectors. Reference numeral 17 denotes a light guide plate, which is disposed on the back surface of the liquid crystal panel 15. The light guide plate 17 plays a role of guiding light from the LED elements mounted on the LED substrate 10 to the liquid crystal panel 15, and the size thereof depends on the size of the liquid crystal panel 15. A plurality of LED substrates 10 are arranged along the peripheral edge of the light guide plate 17.

  Note that there are two types of LED boards 10, 10 </ b> A and 10 </ b> B, depending on the difference in electrical connection between the LED elements mounted on the board and the terminals for external connection.

  FIG. 2 is a schematic configuration diagram in which a connector portion for connecting two LED boards 10 is enlarged and displayed. (A) is a figure which shows the structure of the LED board 10 in the state in which the connector 23 was engage | inserted by 21. FIG. (B) is a conceptual diagram showing how the connector 23 is fitted into the connector 21. The connector 21 corresponds to the “first connector” and the connector 23 corresponds to the “second connector”.

  As shown in FIG. 2, the connector 23 includes two housing parts 25 and a housing connection part 27 that connects them. The housing part 25 is configured to be able to fit into the connector 21 provided on the LED board 10 downward (in the d1 direction) from above. The preferred dimensions of the connector 23 are a length w of 10 mm or less and a height h from the surface of the LED substrate 10 in a state of being fitted in the connector 21 of 2 mm or less. The height h needs to be shorter than at least the distance between the LED substrate 10 and a light guide plate (not shown).

  The connector 21 has a rectangular parallelepiped shape so that the connector 23 can be easily fitted, and is formed of a hard resin material. On the surface of the connector 21, anode / cathode terminals that are electrically and physically connected to the anode / cathode wiring pattern on the LED substrate 10 are formed in a pin shape. The wiring pattern on the LED substrate 10 will be described later separately.

  An anode / cathode terminal for electrical and physical connection with the anode / cathode terminal of the connector 21 is formed inside each housing portion 25. The anode / cathode terminals of the two housing portions 25 are electrically connected by anode / cathode conductors formed in the housing connection portions 27, respectively.

  The connector 23 is made of a stretchable material in consideration of the thermal expansion coefficient of the substrate. As an example, a heat resistant resin is used for the housing portion 25 and a copper alloy is used for the terminal portion (anode / cathode terminal). Further, the housing connecting portion 27 is covered with an insulating tape (for example, a material having strong elasticity such as polyester), and the central portion is bent with a margin in length. Thereby, even when the LED board 10 is thermally expanded and the distance between the two connectors 21 of the adjacent LED boards 10 is shortened, it is possible to avoid a situation in which the housing connection portion 27 is too long and a load is applied. The electrical connection state between the two is secured.

  As shown in FIG. 2, the connector 23 is fitted downward (upward in the direction d1) from the upper side with respect to the connector 21, thereby realizing electrical connection between the two connectors. At this time, in order to facilitate the mounting, it is preferable that the connector 21 and 23 have a concave portion on one side and a convex portion on the other side, and the convex portion is fitted into the concave portion so that the mounting can be performed. Further, at this time, for example, by providing a lock mechanism on the side surface of the connector 21, it is preferable that the concavity and convexity are not easily detached at the time of locking, but can be easily detached when the lock is released.

  The LED substrate 10 is finally screwed to the heat spreader 70 for heat dissipation for each substrate (see FIG. 3). In FIG. 3, 71 is a screw and 73 is a screw hole. FIG. 3 is a schematic illustration only.

  The screw holes 73 provided on each LED substrate 10 have an oval shape with a large diameter in the long side direction of the substrate surface so that the LED substrate 10 can be fixed to the heat spreader 70 even if there is thermal expansion. The LED substrate 10 mounted on the heat spreader 70 is adjusted in position so that the radiation surface of the LED element faces the light guide plate provided on the back side of the liquid crystal panel 15, and is screwed to the housing of the LED backlight. The

  As shown in FIG. 2, the connector 23 is connected to the connector 21 on the LED board 10 from above by connecting the LED boards 10 to each other, so that no complicated process is required to secure the connection. . Further, since the connector 23 has elasticity, the LED substrate 10 is mounted on the heat spreader 70, and even after screwed to the housing, the connector 23 is fitted to ensure the connection between the substrates. be able to. It is also possible to take out only one LED board 10 from the connected LED board group and replace it. In particular, as shown in FIG. 1, in an LED board group in which three or more LED boards are connected, it is also possible to take out and replace an LED board located closer to the center than the end.

  Moreover, the connection between adjacent LED boards 10 is securable by fitting the housing part 25 in the connector 21 in the way of fitting a cap. For this reason, the housing part 25 does not need to have thickness in the short side direction (direction parallel to the substrate surface and orthogonal to the long side direction) of the substrate surface of the LED substrate 10. Therefore, in a state where the LED substrates 10 are connected to each other, a thin backlight can be realized without increasing the thickness in the short side direction of the substrate surface. The connector 21 is formed so as to be smaller than the width in the short side direction of the substrate surface of the LED substrate 10 and to be located inside the outer periphery of the substrate surface.

  4A and 4B are diagrams showing the configuration of the backlight unit in FIG. 1 in more detail. FIG. 4A is a circuit diagram, and FIG. In FIG. 1, in the peripheral part of the light-guide plate 17, it was set as the structure provided with the LED board group by which the several LED board 10 was connected in series along two opposing sides, but in FIG. The LED board group provided along is shown in figure. In the present embodiment, the LED board group includes two LED boards 10A and one LED board 10B.

  In FIG. 4, for the convenience of explanation, in order to distinguish the two LED boards 10 </ b> A, reference numerals “10Aa” and “10Ab” are assigned respectively. In addition, when it demonstrates without distinguishing both, the code | symbol "10A" is used.

  Each LED substrate 10 has a plurality of LED elements 31 mounted on a rectangular substrate surface along the long side direction. A plurality of LED substrates 10 are arranged in the long side direction.

  The LED substrate 10A has a terminal pair including an anode terminal 51 and a cathode terminal 57 along one short side (corresponding to “first short side”), and corresponds to the other short side (corresponding to “second short side”). ) Along with a terminal pair including an anode terminal 55 and a cathode terminal 53. Each terminal pair is mounted on the surface of the connector 21 as a pin for external connection. The anode terminal 51 corresponds to the “first terminal”, the cathode terminal 57 corresponds to the “second terminal”, the cathode terminal 53 corresponds to the “third terminal”, and the anode terminal 55 corresponds to the “fourth terminal”.

  Between the anode terminal 51 and the cathode terminal 53, a plurality of LED elements 31 connected in series in the long side direction of the LED substrate 10A are mounted. The anode terminal 55 and the cathode terminal 57 are short-circuited.

  In practice, a plurality of lands are formed on the LED substrate 10A between the anode terminal 51 and the cathode terminal 53, and these are connected in series. The LED elements 31 are mounted at each land position, so that the plurality of LED elements 31 are connected in series between the anode terminal 51 and the cathode terminal 53.

  Further, the conductive wire connecting the anode terminal 51 and the cathode terminal 53 and the conductive wire connecting the anode terminal 55 and the cathode terminal 57 are mounted on the LED substrate 10A with a gap.

  The LED substrate 10B has a terminal pair including an anode terminal 61 and a cathode terminal 67 along one short side (corresponding to “first short side”), and corresponds to the other short side (corresponding to “second short side”). ) Along with a terminal pair including an anode terminal 65 and a cathode terminal 63. Each terminal pair is mounted on the surface of the connector 21 as a pin for external connection. The anode terminal 61 corresponds to the “first terminal”, the cathode terminal 67 corresponds to the “second terminal”, the cathode terminal 63 corresponds to the “third terminal”, and the anode terminal 65 corresponds to the “fourth terminal”.

  A plurality of LED elements 31 connected in series in the long side direction of the LED substrate 10B are mounted between the anode terminal 61 and the cathode terminal 67 and between the anode terminal 65 and the cathode terminal 63, respectively. The anode terminal 61 is electrically separated from the cathode terminal 63, and the anode terminal 65 is electrically separated from the cathode terminal 67.

  That is, in the case of the LED substrate 10B, the anode terminal 61 and the cathode terminal 67 constituting one terminal pair are electrically connected to each other, and similarly, the anode terminal 63 and the cathode terminal 65 constituting one terminal pair. Are electrically connected to each other.

  The anode terminal 61 of the LED board 10B is connected to the cathode terminal 53 of the LED board 10Aa adjacent to the terminal, and the cathode terminal 67 of the LED board 10B is connected to the anode terminal 55 of the LED board 10Aa. The anode terminal 65 of the LED board 10B is connected to the cathode terminal 57 of the LED board 10Ab adjacent to the opposite side of the LED board 10Aa. The cathode terminal 63 of the LED substrate 10B is connected to the anode terminal 51 of the LED substrate 10Ab.

  More specifically, a connector 23 is provided for a connector 21 disposed at a position close to the LED substrate 10B on the LED substrate 10Aa and a connector 21 disposed at a position close to the LED substrate 10Aa on the LED substrate 10B. The housing part 25 provided is fitted. Thus, the anode terminal 55 of the LED board 10Aa and the cathode terminal 67 of the LED board 10B, and the LED board 10Aa cathode terminal 53 and the anode terminal 61 of the LED board 10B are connected via the connector 23.

  Similarly, a housing part provided in the connector 23 with respect to the connector 21 arranged at a position close to the LED board 10B on the LED board 10Ab and the connector 21 arranged at a position close to the LED board 10Aa on the LED board 10B. 25 is inserted. Thus, the anode terminal 51 of the LED board 10Ab and the cathode terminal 63 of the LED board 10B, and the cathode terminal 57 of the LED board 10Ab and the anode terminal 65 of the LED board 10B are connected via the connector 23.

  In the example of FIG. 4, the LED board group is composed of two LED boards 10A and one LED board 10B, but the size of the LED board group can be adjusted by changing the number of LED boards 10A. FIG. 5 illustrates a case where four LED boards 10A and one LED board 10B are provided. As in the case of FIG. 4, (a) is a circuit diagram, and (b) is a conceptual diagram in top view.

  As shown in FIGS. 4 and 5, the LED board group (a configuration in which a plurality of LED boards 10 are connected in series) assumed by the backlight unit of the present invention includes one LED board 10B and two or more LED boards. 10A.

  And LED board 10B is arrange | positioned so that it may be pinched | interposed into LED board 10A which exists on both sides, and is connected with these LED boards 10A.

  Further, in the case of the LED board 10A, one arranged at a position adjacent to the LED board 10B is connected to the LED board 10B and the other is connected to another LED board 10A or the drive circuit 40. Moreover, what is arrange | positioned in the position which is not adjacent to LED board 10B connects one side with LED board 10A, and connects the other with another LED board 10A or the drive circuit 40. The LED substrate 10A connected to the drive circuit 40 is an LED substrate located at the end of the LED substrate group.

  The connection state between the terminals is not changed with respect to the LED board 10A, and an LED board 10A ′ in which the length in the long side direction and the number of LED elements 31 to be arranged is changed is prepared. It can also be arranged instead (see FIG. 6). FIG. 6 shows an LED substrate 10A having a length L1 in the long side direction of the substrate surface and 10B having a length L2. For example, in the configuration shown in FIG. 5, the length of the entire LED board group can be changed by replacing a part of the LED board 10 </ b> A with 10 </ b> A ′.

  That is, by preparing in advance the LED substrates 10A and 10A ′ having different lengths in the long side direction, it becomes possible to finely adjust the length of the LED substrate group according to the size of the liquid crystal panel 15. . In FIG. 6, two types of LED boards (10A, 10A ′) are assumed. However, the connection state between the terminals is the same as that of the LED board 10A, and the lengths in the long side direction are different by three or more types. An LED substrate may be prepared.

  Further, the LED board 10B may be prepared by replacing the LED board 10B with an LED board 10B 'having a changed size and the number of LED elements 31 to be arranged.

[Another embodiment]
Another embodiment of the present invention will be described.

  <1> FIG. 7 is a schematic configuration diagram in which a connector portion that connects two LED boards 10 is enlarged and displayed, and is a configuration different from that of FIG. 2. As shown to (a), in this Example, the connector 81 is provided on the LED board 10, and both board | substrates are connected by inserting the housing part 85 of the connector 83 in the connector 81. FIG. The connector 83 has two housing portions 85 and a housing connection portion 87 that connects them.

  The connector 81 protrudes perpendicularly from the LED substrate 10 and has a configuration in which a concave portion 82 is provided on the upper surface in the depth direction as shown in FIG. On the other hand, the housing part 85 is a structure on a flat plate and has a convex part in part. By fitting the convex portion of the housing portion 85 into the concave portion 82 of the connector 81 downward from above, the adjacent LED substrates 10 are electrically connected to each other.

  In addition, as shown in (b), the connector 81 has two concave portions 82 for anode connection and cathode connection. In this case, also in the housing part 85, two convex parts for anode connection and cathode connection are formed, and the adjacent LED substrates 10 are electrically connected by fitting each convex part of the housing part 85 into each concave part 82. Connected to.

  <2> In FIG. 4, the anode terminal 61 of the LED substrate 10B is connected to the cathode terminal 53 of the LED substrate 10A, and the cathode terminal 67 of the LED substrate 10B is connected to the anode terminal 55 of the LED substrate 10A. On the other hand, the anode terminal 61 of the LED board 10B may be connected to the cathode terminal 57 of the LED board 10A, and the cathode terminal 67 of the LED board 10B may be connected to the anode terminal 51 of the LED board 10A (see FIG. 8). . In this case, in the LED substrate 10Aa, the anode terminal 55 corresponds to the “first terminal”, the cathode terminal 53 corresponds to the “second terminal”, the cathode terminal 57 corresponds to the “third terminal”, and the anode terminal 51 corresponds to the “fourth terminal”. Will be.

  <3> In the configuration shown in FIGS. 4 and 5, each LED board 10 </ b> A has four terminals, among which a plurality of LED elements are connected in series, and another two terminals are short-circuited. The configuration. On the other hand, it is good also as a structure further provided with a terminal along each short side, and connecting a some LED element in series between two corresponding terminals (refer FIG. 9). In addition, in FIG. 9, although illustrated about the case where six terminals are provided, the case where eight or more terminals are provided can be similarly realized.

  In the case of FIG. 9, the LED boards 10Aa and 10Ab include a plurality of anode terminals 51 as third terminals and cathode terminals 53 as first terminals. A plurality of LED elements 31 are connected in series between the corresponding anode terminal 51 and cathode terminal 53. The LED substrate 10B includes a plurality of anode terminals 61 as third terminals and cathode terminals 63 as first terminals.

  In the LED substrate 10B, each anode terminal 61 is connected to each cathode terminal 53 that exists at an opposing position, and each cathode terminal 63 is connected to each anode terminal 51 that exists at an opposing position. The cathode terminal 67 is connected to the anode terminal 55, and the anode terminal 65 is connected to the cathode terminal 57.

  If more LED boards 10A are arranged, the first short side where the first terminal (anode terminal 51) and the second terminal (cathode terminal 57) are arranged, and the fourth terminal (anode terminal 55). ) And the third terminal (cathode terminal 53) are arranged at positions where the second short sides facing each other are opposed to each other along the opposed short sides of the adjacent substrates. What is necessary is just to set it as the structure which electrically connects a terminal, each 3rd terminal, and a 2nd terminal and a 4th terminal, respectively.

  <4> The LED substrate 10B shown in FIG. 4 has a configuration in which the line is folded back in the vicinity of the center in the long side direction on the substrate, but the folding position is not limited to the vicinity of the center. For example, it is also possible to make a left-right asymmetrical configuration by folding back in the vicinity of one end as in the LED board 10Ba shown in FIG.

  <5> In the above-described embodiment, the description has been made assuming the edge type in which the backlight unit is provided at the edge of the panel. However, the backlight unit with high versatility that does not depend on the size of the liquid crystal panel is also applicable to the direct type. Can be realized.

  <6> In the above-described embodiment, description has been made on the assumption that it is used for a backlight of a liquid crystal panel. However, if the configuration shown in FIGS. 4 and 5 is applied, it can be used for a straight tube type LED lighting device. Is possible.

  Moreover, it replaces with LED board 10A, 10B, and can employ | adopt LED board 11A, 11B which changed the long side direction into the circular arc shape, and can implement | achieve the circular tube type LED illuminating device 2 like FIG. In FIG. 11, reference numeral 41 denotes a power supply unit for the lighting device 2.

  As shown in FIG. 11, LED boards 11A and 11B are arranged in a circumferential direction in a housing (circular tube) having an annular shape, and opposing terminals between adjacent boards are connected to each other. Similar to the backlight unit as shown in FIGS. 4 and 5, it can be handled by changing the number of LED boards 11A to be arranged in accordance with the size of the illumination device.

  In other words, as long as the LED substrates 11A and 11B whose long side direction has an arc shape are prepared, it is possible to cope with any size of circular tube type LED lighting device.

  <7> In the above-described embodiment, a configuration having a plurality of LED substrates 10A and one LED substrate 10B is assumed. However, depending on the size of the liquid crystal panel 15, one LED substrate 10A and one LED substrate 10B may be used for LED. It goes without saying that a backlight unit may be realized.

  Similarly, in the embodiment of the circular tube type LED lighting device shown in FIG. 11, it may be realized by one LED substrate 11A and one LED substrate 11B.

  <8> When the technology of the present invention is applied to an LED lighting device, the lower half of the casing (tube) in which the substrate is accommodated is arranged so that the LED substrate (10A, 10B, 11A, 11B) can be easily replaced. It is preferable to be detachable.

  According to the technique of the present invention, adjacent LED boards are connected by the connector 23 and the connector 83. Then, as described above, these connectors are connected to the connectors 21 and 81 on the substrate by meshing of irregularities and pin fixing. And the housing connection parts 27 and 87 which are connection locations have a structure suitable for replacement, and can be easily replaced even by general users.

  Therefore, when a problem occurs in the light emission of a part of the LED lighting device of the present invention, it is possible to remove the lower half of the case where the problem occurs and replace only the corresponding LED substrate. . This makes it possible to continuously emit stable light at a low cost.

  In the case of a conventional fluorescent lamp, it is necessary to replace the fluorescent lamp by one unit when the illuminance decreases due to the use over time or a phenomenon such as darkening of the end of the tube or discoloration of the tube surface occurs. Further, at this time, the difference in illuminance occurs between the fluorescent lamp at the adjacent position that has not been replaced and the replaced fluorescent lamp, and thus it is necessary to replace a plurality of fluorescent lamps at a time in order to achieve uniform illuminance. There was also a case.

  According to the LED lighting device to which the technology of the present invention is applied, it is sufficient to replace the LED substrate unit, and the amount of work required for the replacement is a level that is sufficiently possible for general users. It is cheap and stable and can maintain a stable illuminance.

  In addition, when applying the technique of this invention to an LED lighting apparatus, it is possible to sell separately the LED board, the connector which connects the board | substrate, and the illumination tube (housing | casing) which accommodates a some LED board. As described above, since the LED substrate of the present invention does not depend on the size of the lighting device and has high versatility, such a sales form can be realized.

1: Backlight unit 2: LED lighting device 10 (10A, 10B, 10Aa, 10Ab, 10A ′, 10Ba): LED substrate 11 (11A, 11B): LED substrate 15: Liquid crystal panel 17: Light guide plate 21: Connector 23: Connector 25: Housing part 27: Housing connection part 31: LED element 40: Drive circuit 41: Power supply unit 51, 55: Anode terminal 53 of LED board 10A 53, 57: Cathode terminal 61A of LED board 10A, 65: LED board 10B ( 10Ba) anode terminal 63, 67: LED substrate 10B (10Ba) cathode terminal 70: heat spreader 71: screw 73: screw hole 81: connector 82: recess 83: connector 85: housing portion 87: housing connection portion 100: conventional Edge of Type backlight unit 101: LED substrate 103: liquid crystal panel 105: connector

Claims (9)

An LED backlight unit in which a plurality of LED substrates on which a plurality of LED elements are mounted along a long side direction on a rectangular substrate surface is arranged in the long side direction,
The plurality of LED substrates are:
Each has first and second terminals along the first short side, and third and fourth terminals along the second short side, and the first short side and the second short side are adjacent to each other. The first terminals and the third terminals formed along the opposing short sides of the substrates to be electrically connected to each other, and the second terminal and the fourth terminal, respectively,
Among the first terminal and the third terminal and between the second terminal and the fourth terminal, one of the plurality of LED elements is connected in series with a common rectifying direction, and the other is short-circuited. One or more first LED substrates;
The first terminal and the second terminal, and the third terminal and the fourth terminal are electrically connected to each other, and at least between the first terminal and the second terminal, or the third terminal and the A LED backlight unit comprising a plurality of LED elements connected in series with a common rectifying direction between fourth terminals. A plurality of the first LED substrates;
The second LED substrate is disposed adjacently so as to be sandwiched between the two first LED substrates, and a plurality of LED elements mounted on the second LED substrate are mounted on the adjacent first LED substrate. The LED backlight unit according to claim 1, wherein the LED backlight unit is connected in series with a plurality of LED elements having a common rectifying direction.   The LED backlight unit according to claim 2, wherein the plurality of first LED boards include LED boards having different long sides. The plurality of LED substrates have a first connector for forming an electrical connection with the outside along the first short side and the second short side on the substrate surface,
Two housing portions and their housings for each of the first connectors formed along one of the opposing first short sides and the other second short side of two adjacent LED substrates By fitting the two housing parts of the second connector comprising a housing connection part that physically and electrically connects the parts from above, the first terminal and the third terminal between the adjacent LED boards, The LED backlight unit according to any one of claims 1 to 3, wherein the second terminal and the fourth terminal are electrically connected to each other.   5. The LED backlight unit according to claim 4, wherein the second connector is configured to be expandable and contractible in at least a separation direction of the two housing portions. Each of the first LED substrate and the second LED substrate includes a plurality of the first terminals and one second terminal along the first short side, and a plurality of the third terminals along the second short side. And the one fourth terminal, and the first short side and the second short side are opposed to each other and are formed at positions facing each other along the opposed short side. Each of the first terminals and the third terminals, and the second terminal and the fourth terminal are electrically connected,
In the first LED board, a plurality of LED elements are connected in series with a common rectifying direction between the first terminals and the third terminals located in the long side direction, and the second terminals and the third terminals The fourth terminal is short-circuited,
The second LED substrate is electrically connected to the first terminals and the second terminals, and the third terminals and the fourth terminals, and at least the first terminals and the second terminals. The plurality of LED elements are connected in series with a common rectification direction between each of the third terminals and the fourth terminals. LED backlight unit. The LED backlight unit according to any one of claims 1 to 6, a liquid crystal panel, and a light guide plate installed on a back surface of the liquid crystal panel,
The liquid crystal display device, wherein the plurality of LED substrates included in the LED backlight unit are arranged along at least a part of a peripheral edge of the light guide plate. In a straight tube type LED lighting device housing, a plurality of LED substrates on which a plurality of LED elements are mounted along the long side direction are a plurality of LED modules for the lighting device arranged in the long side direction,
The plurality of LED substrates are:
Each has first and second terminals along the first short side, and third and fourth terminals along the second short side, and the first short side and the second short side are adjacent to each other. The first terminals and the third terminals formed along the opposing short sides of the substrates to be electrically connected to each other, and the second terminal and the fourth terminal, respectively,
Among the first terminal and the third terminal and between the second terminal and the fourth terminal, one of the plurality of LED elements is connected in series with a common rectifying direction, and the other is short-circuited. One or more first LED substrates;
The first terminal and the second terminal, and the third terminal and the fourth terminal are electrically connected to each other, and at least between the first terminal and the second terminal, or the third terminal and the An LED module for an illuminating device, comprising: a second LED substrate in which a plurality of LED elements are connected in series with a common rectifying direction between fourth terminals. For a lighting device in which a plurality of arc-shaped LED substrates on which a plurality of LED elements are mounted along a long side direction indicating an arc shape are arranged in the long side direction in a circular tube type LED lighting device case An LED module,
The plurality of LED substrates are:
Each has first and second terminals along the first short side, and third and fourth terminals along the second short side, and the first short side and the second short side are adjacent to each other. The first terminals and the third terminals formed along the opposing short sides of the substrates to be electrically connected to each other, and the second terminal and the fourth terminal, respectively,
Among the first terminal and the third terminal and between the second terminal and the fourth terminal, one of the plurality of LED elements is connected in series with a common rectifying direction, and the other is short-circuited. One or more first LED substrates;
The first terminal and the second terminal, and the third terminal and the fourth terminal are electrically connected to each other, and at least between the first terminal and the second terminal, or the third terminal and the An LED module for an illuminating device, comprising: a second LED substrate in which a plurality of LED elements are connected in series with a common rectifying direction between fourth terminals.

Images