JP7601626B2 - Illumination device, display device, and television receiving device - Google Patents

Description

The present invention relates to a lighting device, a display device, and a television receiving device.

Lighting devices equipped with optical elements are known. The optical elements include a light diffusion plate and an optical sheet. In the lighting device disclosed in Patent Document 1, support pins are provided on an LED (Light Emitting Diode) substrate, and the optical element is supported by the support pins.

International Publication WO2012/023458

In the lighting device disclosed in Patent Document 1, a large number of support pins must be provided in addition to the LED board to support the optical components, which creates the problem of an increased number of parts.

One aspect of the present invention aims to reduce the number of parts.

The lighting device according to one aspect of the present invention includes a substrate having a light source mounting surface on which a light source is provided, and an optical member that diffuses the light emitted by the light source, and the substrate has a bent portion that is bent toward the optical member, and the bent portion supports the optical member.

A display device according to one aspect of the present invention includes a lighting device according to one aspect of the present invention.

A television receiving device according to one aspect of the present invention includes a display device according to one aspect of the present invention.

According to one aspect of the present invention, the number of parts can be reduced.

1 is an exploded perspective view showing a schematic configuration of a television receiving device according to each embodiment of the present invention. 1 is a partial cross-sectional view of a display device according to a first embodiment of the present invention. FIG. 6 is a partial cross-sectional view of a display device according to a second embodiment of the present invention. FIG. 11 is a partial cross-sectional view of a display device according to a third embodiment of the present invention. FIG. 11 is a partial cross-sectional view of a display device according to a fourth embodiment of the present invention.

The following describes the mode for carrying out the present invention. For ease of explanation, the same reference numerals are used for components having the same functions as those previously described, and their explanations may not be repeated.

Figure 1 is an exploded perspective view showing the schematic configuration of a television receiver 300 according to each embodiment of the present invention. The television receiver 300 includes a display device 200, a cabinet 201, a power source 202, and a tuner 203. The cabinet 201 is made up of a front housing 201a and a rear housing 201b. The display device 200 is sandwiched between the housings 201a and 201b and is housed in the cabinet 201.

[Embodiment 1]
2 is a partial cross-sectional view of a display device 200a according to the first embodiment of the present invention. The display device 200a is a first example of the display device 200. The display device 200a includes an illumination device 100a, a panel 101, a chassis 102, and a frame 103. The illumination device 100a includes a substrate 1, a plurality of light sources 2, an optical member 3, and a light source driver 4.

The substrate 1 has a light source mounting surface 1a on which a plurality of light sources 2 are provided. The light sources 2 are, for example, LEDs, but are not limited thereto and may be any known light source.

The optical member 3 is composed of a light diffusion plate 5 and an optical sheet 6. The optical sheet 6 is provided by being overlaid on the light diffusion plate 5. The light diffusion plate 5 has a function of transmitting and diffusing the light emitted by the multiple light sources 2. Examples of the optical sheet 6 include a diffusion sheet that diffuses the light incident from the light diffusion plate 5, a lens sheet that focuses the light, a polarizing sheet that polarizes the light, and a combination of two or more of these.

The light source driver 4 drives the multiple light sources 2. When each of the multiple light sources 2 is an LED, the light source driver 4 can be configured by a well-known LED driver. Of course, a well-known light source driver according to the type of light source 2 can be applied as the light source driver 4.

The panel 101 is a translucent panel provided so as to cover the optical member 3 from the side opposite the substrate 1. The chassis 102 houses the lighting device 100a. The frame 103 is provided to fix the panel 101 at the edge of the panel 101, and may be, for example, a part or all of a well-known bezel, or a part or all of a frame provided separately from the bezel.

In the lighting device 100a, the substrate 1 has a bent portion 7. The bent portion 7 is a portion of the substrate 1 that is bent toward the optical member 3. In other words, the bent portion 7 is a portion of the substrate 1 that is bent in the emission direction D1 of the light from the multiple light sources 2. In the lighting device 100a, the bent portion 7 is aligned along a direction D2 perpendicular to the light source mounting surface 1a. The portion of the substrate 1 other than the bent portion 7 is a non-bent portion 8.

One method for forming bent portion 7 in substrate 1 is to apply force to a single piece of substrate 1 to bend it. Another method for forming bent portion 7 in substrate 1 is to construct substrate 1 from two or more pieces and connect two adjacent pieces with a hinge or the like.

The substrate 1 supports the optical element 3 by means of the bent portion 7. Specifically, the bent portion 7 supports the surface 3a of the optical element 3 that faces the substrate 1.

The lighting device 100a eliminates the need to provide support pins in addition to the substrate 1 to support the optical element 3, thereby reducing the number of parts. In addition, the lighting device 100a eliminates the need to form holes in the substrate 1 for providing support pins, thereby preventing a decrease in the heat dissipation effect of the substrate 1.

In the lighting device 100a, the light source driver 4 is provided on the surface 7b of the bent portion 7 opposite the light source mounting surface 1a. In addition, the surface 7a is the surface of the bent portion 7 on the light source mounting surface 1a side. Specifically, the surface 7a is the surface belonging to the light source mounting surface 1a in the state before the bent portion 7 is formed on the substrate 1. Specifically, the surface 7b is the surface belonging to the surface 1b of the substrate 1 opposite the light source mounting surface 1a in the state before the bent portion 7 is formed on the substrate 1. As a result, the light source driver 4 can be arranged between the non-bent portion 8 and the optical member 3 in the thickness direction of the lighting device 100a. Therefore, the lighting device 100a can be made thinner. This also prevents the light emitted by the multiple light sources 2 from hitting the light source driver 4. Therefore, it is possible to suppress the light source driver 4 from absorbing the light or reflecting the light in an unexpected direction.

In the lighting device 100a, it is assumed that the surface 3a is flat (in other words, there is no bending of the optical member 3). Under this assumption, the length L1 from the bent portion 9 of the substrate 1 to the tip 10 of the bent portion 7 is the same as the distance L2 between the light source mounting surface 1a and the surface 3a along the direction D2. The distance L2 under this assumption is, for example, 5 mm. On the other hand, when the optical member 3 bends toward the substrate 1, the distance L2 becomes smaller depending on the position within the surface 3a, and the length L1 may be smaller than the maximum value of the distance L2 (i.e., the distance L2 under the assumption). From this, it can be seen that the bent portion 7 may be formed shorter than the distance L2 under the assumption depending on the allowable amount of bending of the optical member 3.

[Embodiment 2]
3 is a partial cross-sectional view of a display device 200b according to a second embodiment of the present invention. The display device 200b is a second example of the display device 200.

The difference between the display device 200a and the display device 200b is that the display device 200a is equipped with the lighting device 100a, while the display device 200b is equipped with the lighting device 100b. The differences between the lighting device 100a and the lighting device 100b are as follows.

In the lighting device 100a, the bent portion 7 is aligned along a direction D2 perpendicular to the light source mounting surface 1a. On the other hand, in the lighting device 100b, the bent portion 7 is inclined from the direction D2 perpendicular to the light source mounting surface 1a.

The inclination angle of the bent portion 7 with respect to the direction D2 is defined as angle θ. The magnitude of angle θ is not particularly limited and is within the range of 0°<θ<90°. The larger the angle θ, the longer the length of the bent portion 7 in cross-sectional view (e.g., length L1 in FIG. 2 ). Therefore, for example, angle θ may be set depending on how long the length can be increased.

In FIG. 3, the bent portion 7 is inclined so that it is located further out from the lighting device 100b as it approaches the optical member 3. On the other hand, the bent portion 7 may be inclined so that it is located further out from the lighting device 100b as it moves away from the optical member 3. In other words, if the angle θ is set to an angle that increases counterclockwise from the direction D2, the angle θ is positive in FIG. 3, but the angle θ may also be negative.

With the above configuration, the angle at which the light emitted by the multiple light sources 2 strikes the bent portion 7 can be controlled depending on the magnitude of the angle θ, making it possible to control the light distribution characteristics of the lighting device 100b.

[Embodiment 3]
4 is a partial cross-sectional view of a display device 200c according to a third embodiment of the present invention. The display device 200c is a third example of the display device 200.

The difference between the display device 200a and the display device 200c is that the display device 200a is equipped with the lighting device 100a, while the display device 200c is equipped with the lighting device 100c. The differences between the lighting device 100a and the lighting device 100c are as follows.

In the lighting device 100a, the light source driver 4 is provided on the surface 7b of the bent portion 7, opposite the light source mounting surface 1a. On the other hand, in the lighting device 100c, the light source driver 4 is provided on the surface 7a of the bent portion 7, on the side of the light source mounting surface 1a.

With the above configuration, the light source driver 4 can be positioned further inside the bent portion 7 in the lighting device 100c when viewed from above. This makes it possible to realize a display device 200c with a narrow frame.

[Embodiment 4]
5 is a partial cross-sectional view of a display device 200d according to a fourth embodiment of the present invention. The display device 200d is a fourth example of the display device 200.

The difference between display device 200a and display device 200d is that display device 200a includes lighting device 100a, while display device 200d includes lighting device 100d. The differences between lighting device 100a and lighting device 100d are as follows:

In the lighting device 100a, the light source driver 4 is provided on the surface 7b of the bent portion 7, opposite the light source mounting surface 1a. On the other hand, in the lighting device 100d, the light source driver 4 is provided outside the bent portion 7 of the substrate 1. That is, in the lighting device 100d, the light source driver 4 is provided in the non-bent portion 8. Note that in the lighting device 100d, the light source driver 4 is provided on surface 1b, but may be provided on the light source mounting surface 1a.

With the above configuration, the light source driver 4 can be positioned further inside the bent portion 7 in the lighting device 100d when viewed from above. This makes it possible to realize a display device 200d with a narrow frame.

The lighting device 100d also includes a heat diffusion member 11. The heat diffusion member 11 diffuses heat generated in the display device 200d, such as heat generated by the light emitted by the multiple light sources 2 and heat emitted by the light source driver 4. The heat diffusion member 11 is provided on the surface 1b. The heat diffusion member 11 is provided in a form that covers the light source driver 4.

The above configuration allows the heat generated by the light source driver 4 to be sufficiently diffused while realizing the narrow-frame display device 200d as described above.

[Additional Notes]
In each of the lighting devices 100a to 100d, the end of the substrate 1 is bent at a bent portion 7, and the bent portion 7 supports the optical member 3 near the edge of the optical member 3, but this is not limited to this. It is arbitrary which portion of the substrate 1 is to be the bent portion 7, and which portion of the optical member 3 is to be supported by the bent portion 7.

When the support form of the optical member 3 by the bent portion 7 in the category shown in each of Figs. 2 to 5 is considered to be point-like, if the depth direction in each of Figs. 2 to 5 is also taken into consideration, the support form of the optical member 3 by the bent portion 7 is not limited to point-like but can also be linear. In particular, if the bent portion 7 supports the optical member 3 in a line surrounding the non-bent portion 8, leakage of light emitted by multiple light sources 2 can be prevented, which is particularly suitable for a local dimming method in which illumination is provided for each of multiple areas.

The display devices 200a to 200d have the same effects as the lighting devices 100a to 100d, respectively. Both the lighting devices 100a to 100d and the display devices 200a to 200d are included in the scope of the present invention.

The television receiving device 300 includes one of the display devices 200a to 200d as the display device 200, and therefore has the same effects as one of the display devices 200a to 200d. The television receiving device 300 is also included in the scope of the present invention.

〔summary〕
The lighting device according to aspect 1 of the present invention comprises a substrate having a light source mounting surface on which a light source is provided, and an optical element that diffuses light emitted by the light source, the substrate having a bent portion that is bent toward the optical element, and the optical element is supported by the bent portion.

With the above configuration, there is no need to provide support pins in addition to the substrate to support the optical element, which reduces the number of parts.

The lighting device according to aspect 2 of the present invention is the same as the lighting device according to aspect 1, but includes a light source driver that drives the light source, and the light source driver is provided on the surface of the bent portion opposite the surface on which the light source is mounted.

The above configuration allows the lighting device to be made thinner. In addition, the above configuration can prevent the light emitted by the light source from hitting the light source driver. This can prevent the light source driver from absorbing the light or reflecting it in an unexpected direction.

The lighting device according to aspect 3 of the present invention is the same as in aspect 1, but includes a light source driver that drives the light source, and the light source driver is provided on the surface of the bent portion that faces the light source mounting surface.

With this configuration, the light source driver can be positioned further inside the bent portion of the lighting device when viewed from above. This makes it possible to realize a display device with a narrow frame.

The lighting device according to aspect 4 of the present invention is the same as in aspect 1, except that it includes a light source driver that drives the light source, and the light source driver is provided outside the bent portion of the substrate.

With this configuration, the light source driver can be positioned further inside the bent portion of the lighting device when viewed from above. This makes it possible to realize a display device with a narrow frame.

The lighting device according to aspect 5 of the present invention is the same as in aspect 4, except that it is provided with a heat diffusion member that covers the light source driver.

The above configuration makes it possible to realize a display device with a narrow frame while sufficiently diffusing the heat generated by the light source driver.

The lighting device according to aspect 6 of the present invention is any one of aspects 1 to 5, in which the bent portion is inclined from a direction perpendicular to the light source mounting surface.

With the above configuration, the angle at which the light emitted by the light source strikes the bent portion can be controlled depending on the magnitude of the inclination angle of the bent portion relative to the direction perpendicular to the light source mounting surface, making it possible to control the light distribution characteristics of the lighting device.

The display device according to aspect 7 of the present invention is equipped with the illumination device according to any one of aspects 1 to 6.

The above configuration allows the display device to achieve the effects of the lighting device of the present invention.

A television receiver according to aspect 8 of the present invention is equipped with the display device according to aspect 7.

The above configuration allows the effects of the display device of the present invention to be obtained in a television receiving device.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Furthermore, new technical features can be formed by combining the technical means disclosed in the respective embodiments.

REFERENCE SIGNS LIST 1 Substrate 1a Light source mounting surface 2 Light source 3 Optical member 4 Light source driver 7 Bending portion 7a Surface 7b of the bending portion on the light source mounting surface side Surface 11 of the bending portion opposite to the light source mounting surface Thermal diffusion members 100a, 100b, 100c, and 100d Illumination devices 200, 200a, 200b, 200c, and 200d Display device 300 Television receiver D2 Direction perpendicular to the light source mounting surface

Claims (4)

a substrate having a light source mounting surface on which a light source is provided;
an optical member that diffuses light emitted by the light source ;
a light source driver that drives the light source ,
the substrate has a bent portion bent toward the optical member, and the bent portion supports the optical member;
the bent portion is a portion where the substrate is bent,
The bent portion is provided on the outer side of the light source mounting surface,
The light source driver is provided on a surface of the bent portion on the side of the light source mounting surface . The lighting device according to claim 1 , wherein the bent portion is inclined from a direction perpendicular to the light source mounting surface. The lighting device according to claim 1 ;
and a chassis that houses the lighting device,
The display device, wherein the bent portion has a surface opposite to the light source mounting surface in contact with the chassis. A television receiving device comprising the display device according to claim 3 .

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