JP5343571B2 - Light source device and display device - Google Patents

Description

  The present invention relates to a light source device and a display device.

  Conventionally, for example, a light source device used in a liquid crystal display device or the like is provided with a light source, a flexible substrate on which the light source is mounted, and a light guide plate that converts light from the light source into a surface light source (for example, Patent Document 1). reference).

JP 2003-281924 A

In recent years, in order to increase the illuminance, a light source with a large number of light sources arranged on a flexible substrate has been developed. There is a possibility that the lifetime may be reduced or the luminous efficiency may be reduced.
An object of the present invention is to provide a light source device and a display device that can easily dissipate heat from a light source.

In order to solve the above problems, according to one aspect of the present invention,
Multiple light sources;
A flexible substrate on which a plurality of the light sources are mounted;
A frame for supporting the flexible substrate;
A plurality of light sources, a case for accommodating the flexible substrate and the frame,
The flexible substrate includes a wiring pattern to which a plurality of the light sources are electrically connected, and a metal heat dissipation region that is disposed apart from the wiring pattern and is electrically independent of the wiring pattern,
The heat dissipation area is formed on the first surface of the flexible substrate on which the light source is mounted,
The flexible substrate has a first part provided with the wiring pattern and a second part provided with the heat dissipation area , and the second part is in contrast to a third part on which the light source is mounted. Are arranged in parallel with the second part, and a slit is provided between the first part and the second part so that the first part and the second part can be bent separately. A light source device is provided.

In the light source device, preferably, the heat dissipation area is formed on a second surface of the flexible substrate opposite to the first surface.
In the light source device, preferably, a through hole is formed in the flexible substrate at a position facing at least one of the plurality of light sources.
In the light source device, preferably, the flexible substrate is formed with a through hole at least partially overlapping at least one of the plurality of light sources.
In the light source device, preferably, the heat dissipation area is in contact with an inner surface of the case.
In the light source device, preferably, the flexible substrate is provided so as to be drawn out of the case, and the heat dissipation region is in contact with an outer surface of the case.
In the light source device, preferably, the flexible substrate is provided so as to be drawn out of the case, and the heat dissipation area is exposed to the outside of the light source device.
In the light source device, preferably, the heat radiation area is in contact with the frame.

According to another aspect of the invention,
The light source device;
And a display panel that performs display using light emitted from the light source device.

  According to the present invention, a metal heat dissipation area that is electrically independent of the wiring pattern is formed on the flexible substrate. Therefore, a light source capable of efficiently dissipating heat generated by each light source by the heat dissipation area. An apparatus and a display device can be provided.

It is a perspective view which shows the principal part structure of the light source device of this embodiment. FIG. 2 is an exploded perspective view of a part of a light source device provided in the display device of FIG. 1. It is sectional drawing along the III-III cutting line of the light source device among the display apparatuses of FIG. It is explanatory drawing which shows the surface (1st surface) side of the flexible substrate with which the light source device of FIG. 1 is equipped. It is explanatory drawing which shows the back surface (2nd surface) side of the flexible substrate of FIG. It is a perspective view which shows the 1st modification of a light source device among the display apparatuses of FIG. It is a perspective view which shows the 2nd modification of a light source device among the display apparatuses of FIG. It is sectional drawing along the VIII-VIII cutting line of the light source device among the display apparatuses of FIG.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

  FIG. 1 is a perspective view illustrating a configuration of a main part of a display device according to the present embodiment, FIG. 2 is an exploded perspective view of a part of a light source device provided in the display device, and FIG. It is sectional drawing along a cutting line. As shown in FIGS. 1 to 3, the display device 10 includes a flexible substrate 2, a light guide plate 3 connected to the flexible substrate 2, a flexible substrate 2, a pair of glass substrates 52 and 53, and an injection between them. The display panel 54 including the liquid crystal, the light guide plate 3 and the frame 4 that supports the display panel 54, the flexible substrate 2, the light guide plate 3, the frame 4, and the lower case 5 and the upper case 55 that accommodate the display panel 54 are provided. It has been. The display panel 54 of the present embodiment is a liquid crystal display panel, and drives a liquid crystal injected between a pair of glass substrates 52 and 53 by applying a predetermined voltage from a drive circuit 56 to a thin film transistor as a switching element. Then, display is performed using the light emitted from the light source device 1. Further, the display panel 54 is provided with a protruding portion on which one of the pair of glass substrates 52 and 53 protrudes from the other substrate 52 and on which the above-described driving circuit 56 is mounted. A plurality of pixel electrodes (not shown) formed, a plurality of thin film transistors (not shown) connected to the pixel electrodes, and a plurality of wirings (not shown) for driving the thin film transistors are formed.

  4 is an explanatory view showing the front surface (first surface) side of the flexible substrate 2, and FIG. 5 is an explanatory view showing the back surface (second surface) side. As illustrated in FIGS. 2 and 3, the flexible substrate 2 includes a light source mounting portion 21 on which the light source 6 is mounted, and a connection portion 22 that extends from one end portion of the light source mounting portion 21 and is connected to an external connection terminal. . The light source mounting portion 21 includes a first step portion 211 having a width corresponding to the length of one side of the light guide plate 3 and a second step portion 212 having a width shorter than the first step portion 211. The connecting portion 22 extends from the second step portion 212.

  A plurality of light sources 6 are mounted on the surface 211 a of the first step portion 211 in the light source mounting portion 21 via solder 61. The plurality of light sources 6 are LEDs, and are arranged in a line at a predetermined interval. For example, a cold cathode tube or the like is used as the light source 6 in addition to the LED. In addition, a wiring pattern 23 to which a plurality of light sources 6 are electrically connected is formed on the surface 211a of the first step portion 211, the surface 212a of the second step portion 212, and the surface 22a of the connection portion 22 in the light source mounting portion 21. Has been. On the surface 212 a of the second step portion 212, metal films 24 and 25 that are arranged apart from the wiring pattern 23 and electrically independent from the wiring pattern 23 are formed.

  On the other hand, as shown in FIG. 5, a metal film 26 is formed on the entire back surface 21 b of the light source mounting portion 21. The metal films 24, 25, and 26 formed on the light source mounting portion 21 are heat radiating areas that radiate heat from the light source 6. A through hole 27 is formed in the light source mounting portion 21 at a position facing each of the plurality of light sources 6. The heat of the light source 6 is conducted through the through hole 27 to the metal film 26 on the back surface 21b.

  The light guide plate 3 diffuses the light emitted from the light source 6 that is a point light source to form a surface light source. As shown in FIGS. 1 to 3, the light guide plate 3 is formed in a rectangular plate shape, and the first step portion 211 of the flexible substrate 2 is connected to one end portion thereof via the adhesive layer 8. Under the present circumstances, it arrange | positions so that the light source 6 on the flexible substrate 2 may contact one side of the light-guide plate 3 (refer FIG. 3). Thereby, the light emitted from the light source 6 enters the light guide plate 3. If it arrange | positions so that the one side surface of the light-guide plate 3 and the light source 6 may contact directly, it can suppress that the emitted light from the light source 6 diffusely reflects in one side surface of the light-guide plate 3, and the emitted light from the light source 6 is efficiently light source Can be used as However, since the light emitted from the light source 6 may be incident on the light guide plate 3, one side surface of the light guide plate 3 and the light source 6 may be separated from each other.

  The frame 4 includes a resin lower frame 41 and an upper frame 42. The lower frame 41 is provided with an opening 411 in which the light guide plate 3 is accommodated. The flexible substrate 2 is connected to one end portion of the lower frame 41 via the adhesive layer 9. The upper frame 42 is provided with an opening 421 that exposes the light emitting portion of the light guide plate 3. The display panel 54 is disposed in the opening 421. A protrusion 422 for positioning the light guide plate 3 is formed on the lower surface of the upper frame 42 over the periphery of the opening 421.

  Each of the lower case 5 and the upper case 55 is a box formed of sheet metal, and a part of the flexible substrate 2, the lower frame 41, and the guide are formed in a casing formed by the lower case 5 and the upper case 55. The optical plate 3 and the display panel 54 are stored. Further, notches 51a and 51b for drawing the flexible substrate 2 to the outside are formed on one side wall of the lower case 5 and the upper case 55, respectively. An upper frame 42 is attached to an opening portion of the lower case 5, and an upper case 55 is attached on the upper frame 42 so as to be fitted to the lower case 5.

  Here, with reference to FIG. 3, the contact state of the flexible substrate 2 and each part when the lower case 5 is stored will be described. When stored in the lower case 5, the portion of the flexible substrate 2 that contacts the light source 6 and the light guide plate 3 contacts the protrusion 422 of the upper frame 42. In addition, the second step portion 212 and the connection portion 22 of the light source mounting portion 21 of the flexible substrate 2 are pulled out from the notch 51 a of the lower case 5, bent, and in contact with the lower surface of the lower case 5. More specifically, the metal films 24 and 25 formed on the front surface 211a of the flexible substrate 2 are in contact with the lower surface of the lower case 5, and the metal film 26 formed on the back surface 21b is a protrusion of the upper frame 42. It is in contact with 422 and exposed to the outside of the lower case 5.

Next, the operation of this embodiment will be described.
The amount of heat generated from each light source 6 is conducted to the flexible substrate 2 through the solder 61 and to the metal film 26 on the back surface 21b through the through hole 27. The amount of heat conducted to the flexible substrate 2 is conducted to the metal film 26 on the back surface 21b and the metal films 24 and 25 on the front surface 211a. In the metal film 26 on the back surface 21 b, heat is radiated from the protrusion 422 to the upper frame 42 or radiated to the outside of the lower case 5. On the other hand, heat is radiated to the lower case 5 in the metal films 24 and 25 on the surface 211a.

  As described above, according to the present embodiment, the heat radiation area (metal films 24, 25, and 26) made of metal that is electrically independent from the wiring pattern 23 is formed on the flexible substrate 2. Thus, it is possible to efficiently dissipate the heat generated by each light source 6. Therefore, the heat generation from the light source 6 can be prevented from adversely affecting the light source 6 itself, and the life of the light source can be extended.

In addition, since the light source 6 and the heat dissipation area (metal films 24 and 25) are provided on the surface 211a of the flexible substrate 2, the amount of heat from the light source 6 can be easily conducted to the heat dissipation area.
Further, since the heat radiation area (metal film 26) is also provided on the back surface 21b of the flexible substrate 2, the heat radiation area can be set in a wide range, and the heat radiation efficiency can be increased.
Moreover, since the through-hole 27 is formed in the position which opposes the at least 1 light source 6 among the several light sources 6 in the flexible substrate 2, the heat | fever amount of the light source 6 is made into the back surface 21b through the through-hole 27. It becomes easy to conduct to the heat dissipation area.
Moreover, since the heat radiation area is in contact with the lower case 5 made of metal, the heat radiation efficiency can be further increased.

Note that the present invention is not limited to the above embodiment, and can be modified as appropriate. In the following drawings, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
For example, in the present embodiment, the case where the metal films 24 and 25 on the surface 211a of the flexible substrate 2a and the wiring pattern 23 are formed in the same region (second step portion 212) is illustrated, but FIG. As shown in the light source device 1A, a wiring pattern 23a is formed on the connection portion 22 that directly extends from the light source mounting portion 21a of the flexible substrate 2a, and the first light source mounting portion 21a is arranged in parallel with the connection portion 22. The heat radiation area 24a (not shown) may be formed on the front surface 211a and the heat radiation area 26a may be formed on the back surface 21b of the two-stage portion 212a. In FIG. 6, the display panel and the upper case are not shown. In this case, the degree of freedom in design of the heat dissipation region 24a is increased, so that the heat dissipation region 24a can be formed in a wider range. A plurality of through holes 27a may be formed from the front surface 211a to the back surface 21b of the flexible substrate 2a.

  In the present embodiment, the case where the metal film 26 on the back surface 21 b of the flexible substrate 2 is in contact with the back surface of the lower case 5 is exemplified, but a configuration in which the metal film 26 is in contact with the inner surface of the lower case 5 is also possible. . In this case, as in FIG. 6, as in the light source device 1B shown in FIGS. 7 and 8, the wiring pattern 23b is formed in the connection portion 22 that directly extends from the light source mounting portion 21b of the flexible substrate 2b, and the light source mounting portion 21b is formed. On the other hand, a heat radiation area 24b (see FIG. 8) is formed on the front surface 211a and a heat radiation area 26b (see FIG. 8) is formed on the back surface 21b of the second step part 212a arranged in parallel with the connection part 22. 7 and 8, the display panel and the upper case are not shown. The connection part 22 in which the wiring pattern 23b is formed is drawn out of the lower case 5b (see FIG. 7), and the second step part 212b in which the heat radiation area 24b is formed is wound around the lower frame 41 (FIG. 8). reference). Here, the heat dissipation area 24b formed on the front surface 211a of the flexible substrate 2b is in contact with the outer surface of the lower frame 41, and the heat dissipation area 26b formed on the back surface 21b of the flexible substrate 2b is in contact with the inner surface of the lower case 5. become. Moreover, you may make it form the some through-hole 27b from the surface 211a of the flexible substrate 2b to the back surface 21b, respectively.

  Moreover, in the above-described embodiment and each modification, the case where the entire through-hole 27 overlaps with the plurality of light sources 6 is illustrated, but at least a part of the through-holes 27 is at least one of the plurality of light sources 6. It is also possible to provide them so as to overlap. By so doing, the amount of heat from the light source 6 can be easily conducted to the through hole 27, so that the heat radiation effect can be enhanced as compared with the case where the through hole 27 does not overlap the light source 6.

1, 1A, 1B Light source device 2 Flexible substrate 3 Light guide plate 4 Frame 5 Lower case 6 Light source 10 Display device 21 Light source mounting portion 22 Connection portion 21b Back surface (second surface)
22a Surface (first side)
23 Wiring pattern 24, 25, 26 Metal film (radiation area)
27 Through-hole 41 Lower frame 42 Upper frame 54 Display panel 55 Upper case 211a Surface (first surface)
212a Surface (first side)

Claims (9)

Multiple light sources;
A flexible substrate on which a plurality of the light sources are mounted;
A frame for supporting the flexible substrate;
A plurality of light sources, a case for accommodating the flexible substrate and the frame,
The flexible substrate includes a wiring pattern to which a plurality of the light sources are electrically connected, and a metal heat dissipation region that is disposed apart from the wiring pattern and is electrically independent of the wiring pattern,
The heat dissipation area is formed on the first surface of the flexible substrate on which the light source is mounted,
The flexible substrate has a first part provided with the wiring pattern and a second part provided with the heat dissipation area , and the second part is in contrast to a third part on which the light source is mounted Are arranged in parallel with the second part, and a slit is provided between the first part and the second part so that the first part and the second part can be bent separately. A light source device characterized by that. The light source device according to claim 1,
The heat radiation area is formed on a second surface of the flexible substrate opposite to the first surface. The light source device according to claim 2,
The flexible substrate has a through hole formed at a position facing at least one of the light sources among the plurality of light sources. The light source device according to claim 2,
The flexible substrate is formed with a through hole in which at least a part of at least one of the plurality of light sources overlaps with the light source. In the light source device according to any one of claims 1 to 4,
The light source device, wherein the heat radiation area is in contact with an inner surface of the case. In the light source device according to any one of claims 1 to 5,
The flexible substrate is provided to be pulled out of the case,
The heat radiation area is in contact with the outer surface of the case. In the light source device according to any one of claims 1 to 5,
The flexible substrate is provided to be pulled out of the case,
The heat radiation area is exposed to the outside of the light source device. In the light source device according to any one of claims 1 to 7,
The light source device, wherein the heat radiation area is in contact with the frame. The light source device according to any one of claims 1 to 8,
And a display panel that performs display using light emitted from the light source device.

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