JP2007265837A - Frame for lighting system, lighting system and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system and a display device capable of improving heat radiation capability and strength. <P>SOLUTION: This display device 1 is provided with a display panel 2, and this lighting system 3 arranged on the back surface of the display panel 2 for illuminating the display panel 2. The lighting system 3 is provided with a light source 7, a light guide body 6 for guiding light from the light source 7 to emit it in a planar form; and a frame 8 used for housing the light source 7 and the light guide body 6 on the inside surface side and formed with a cast metal body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an illumination device that illuminates a display panel, and a display device having the illumination device. The present invention also relates to a lighting device frame.

A display device having a display panel such as a conventional liquid crystal panel is disclosed in Patent Document 1. FIG. 6 is a side sectional view showing an outline of the display device. The display device 1 is provided with a lighting device 3 on the back surface of the display panel 2. The housing of the illuminating device 3 includes a resin frame 8, and the light source 7 and the light guide 6 are held by the frame 8. The light source 7 is composed of an LED or a cold cathode tube, and is disposed facing the side surface of the light guide 6. The light guide body 6 guides light emitted from the light source 7 from the side surface while reflecting the light inside.

The display panel 2 is attached to the lighting device 3 by an upper bezel 4 that covers the periphery. Frame 8
A metal lower bezel 5 processed by sheet metal is attached to the lower surface of the plate. The display device 1 is attached to a chassis (not shown) of a device on which the display device 1 is mounted by a screw (not shown) inserted through an attachment hole 5 a provided in the lower bezel 5.

In the display device 1 configured as described above, light emitted from the light source 7 enters the light guide 6 and is guided. Light exceeding the critical angle after being guided through the light guide 6 is uniformly emitted from the emission surface 6a facing the display panel 2. The light emitted from the light guide 6 illuminates the display panel 2. Thereby, the display panel 2
An image is displayed.

The heat of the light source 7 is transmitted to the lower bezel 5 through the frame 8 and is radiated through the chassis. Thereby, the image quality fall by the thermal deformation of the display panel 2 and the illuminating device 3 can be prevented.
JP 2002-109929 A (pages 4-6, FIG. 4)

However, according to the conventional display device 1, the heat of the light source 7 is transmitted to the lower bezel 5 through the resin frame 8 having a low thermal conductivity. For this reason, there is a problem that heat is not sufficiently radiated from the lighting device 3 and the image quality of the display device 1 is deteriorated. Further, the frame 8 made of a resin molded product and the lower bezel 5 made of sheet metal processing have a thin thickness, and there is a problem that sufficient strength of the lighting device 3 cannot be obtained.

An object of this invention is to provide the illuminating device and display apparatus which can improve heat dissipation and intensity | strength. Moreover, an object of this invention is to provide the flame | frame for illuminating devices which can improve the heat dissipation and intensity | strength of an illuminating device.

In order to achieve the above object, an illumination device of the present invention accommodates a light source, a light guide that guides light from the light source and emits it in a planar shape, and the light source and the light guide on the inner surface side. And a frame made of a cast metal body. According to this configuration
The light emitted from the light source held by the frame is guided through the light guide and is uniformly emitted from the illumination device, and the display panel arranged facing the illumination device is illuminated. The heat of the light source is dissipated through a frame made of a cast product.

According to the present invention, in the illumination device having the above configuration, a convex boss protruding from the surface is provided on the outer surface of the frame.

According to the present invention, in the illuminating device having the above-described configuration, the convex boss is an attachment portion that can be connected and fixed to the outside. According to this configuration, the mounting portion is attached to the chassis, the heat radiating plate, or the like of the device on which the lighting device is mounted by screwing or the like. The heat of the light source is dissipated through the frame and the chassis.

In the illumination device having the above-described configuration, the light source is disposed on the end face side of the light guide, and the convex boss provided on the outer surface of the frame is disposed with the light source. It is provided on the side surface of the frame.

In the illumination device having the above-described configuration, the light source is disposed on the end face side of the light guide, and the convex boss provided on the outer surface of the frame is the light source. The light source is arranged closer to the side where the light source is arranged than the side where the light source is not arranged, and is provided on the back surface of the frame.

In the illumination device having the above-described configuration, the light source is disposed on a back surface side opposite to the light exit surface of the light guide, and the frame has a curved surface on the inner surface side. The convex boss provided on the outer surface of the frame is provided on the back surface of the frame.

According to the present invention, in the illuminating device having the above-described configuration, the light guide has a back surface facing the light exit surface inclined with respect to the light exit surface, and the frame has an inclined surface facing the back surface. Yes. According to this configuration, the light emitted from the light source enters the light guide and is guided, and the light reflected by the inclined surface is emitted from the light emission surface of the light guide.

According to the present invention, in the illumination device configured as described above, the frame is made of aluminum.

The display device of the present invention is characterized in that a display panel is provided on the exit surface side of the illumination device having the above-described configuration.

The lighting device frame of the present invention is characterized in that it is made of a cast metal body in the lighting device frame that forms a housing of the lighting device that illuminates the display panel and holds the light source.

The present invention is also characterized in that the lighting device frame configured as described above is made of aluminum.

According to the present invention, since the frame of the lighting device is made of a cast metal, it is not necessary to provide a metal frame on the back surface of the lighting device, the number of parts can be reduced, the strength of the frame can be improved, and the strength of the lighting device can be improved. . Further, the heat of the light source is radiated to the outside through a mounting portion provided on the metal frame, and the volume of the frame is increased, so that the heat capacity is increased and the heat from the light source is not easily accumulated. Therefore, the heat dissipation of the lighting device can be improved. In addition, it is possible to mass-produce frames having the same shape by casting at a low cost, and it is possible to suppress an increase in costs of the frame, the lighting device, and the display device.

Further, according to the present invention, since the mounting portion for supporting or fixing the frame is provided on the outer surface of the frame, the lighting device can be easily attached to the chassis or the like by avoiding the circuit board disposed around the lighting device. Can do.

Further, according to the present invention, the light source is arranged on the side of the side end face of the light guide, and the boss is provided on the side of the frame on the side where the light source is arranged, so that the heat of the light source can be radiated more reliably through the boss. be able to.

Further, according to the present invention, the light source is disposed on the side of the side end surface of the light guide, and the boss is provided on the back surface of the frame while being biased toward the side where the light source is disposed. It can dissipate heat.

According to the present invention, since the light source is provided on the back surface side of the light guide and the boss is provided on the back surface of the frame, the heat of the light source can be radiated more reliably through the boss.

According to the present invention, since the frame has an inclined surface facing the back surface of the light guide, the volume of the frame is further increased and the heat dissipation of the lighting device can be further improved.

According to the present invention, since the frame is made of aluminum, a cast frame can be easily realized, and the heat conductivity of the frame is high and the heat dissipation can be further improved.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing a display device according to the first embodiment. For convenience of explanation, the same parts as those of the conventional example shown in FIG. The display device 1 includes a display panel 2 such as a liquid crystal display and an illumination device 3 that emits light from the back side of the display panel. The display panel 2 is attached to the lighting device 3 by a frame-shaped upper bezel 4 that covers the outer peripheral portion (end portion) of the panel from the display surface side.

The illuminating device 3 includes a light source 7, a light guide 6 that collects light emitted from the light source 7 from an end surface (side surface), diffuses the light inside, and converts the light into a surface light source, and the light source 7 and the light guide 6. A housing frame 8 is provided. The frame 8 has a volume larger than that of the light guide 6. Therefore, the side surface of the light guide 6 is surrounded by the frame 8 to be accommodated. As shown in FIG.
Is arranged on the end face of the light guide 6 in the frame 8 and is composed of, for example, a plurality of LEDs mounted on the FPC 9, and the FPC 9 is attached to the side wall of the frame 8. Accordingly, the light source 7 is disposed adjacent to the side wall of the frame 8 and faces the side surface of the light guide 6.

The light guide 6 has an exit surface 6a facing the display panel 2, and a back surface 6b facing the exit surface 6a.
The cross section inclined with respect to the exit surface 6a is wedge-shaped. A surface 8c of the frame 8 facing the back side of the light guide 6 is a reflective surface that reflects light incident from the light guide 6 side and can be emitted to the light guide 6 and the display panel 2 side. Light emitted from the light source 7 and incident on the light guide 6 is guided in the light guide 6. In addition, one or a plurality of optical sheets (not shown) such as a lens (prism) sheet, a diffusing plate, and a reflective polarizer are arranged on the light exiting surface 6 a side of the light guide 6. A reflective sheet (not shown) is provided on the back surface 6b side as necessary.

The frame 8 is formed by casting aluminum having a high thermal conductivity. For this reason, since the frame 8 has a predetermined thickness that can be cast, the frame 8 has a large volume and a large heat capacity.
Further, an inclined surface 8c facing the back surface 6b of the light guide 6 is formed on the inner surface side of the frame. Thereby, the thickness on the side away from the light source 7 is further increased, and the heat capacity of the frame 8 is further increased. The material of the frame 8 has a low thermal conductivity, but stainless steel or brass may be used.

An attachment portion (convex boss) 8a that protrudes outward from the surface is provided on the back surface of the frame 8 (the side opposite to the side on which the display panel 2 is disposed). The mounting portion 8a is provided with a screw hole 8b, and the frame 8 is fixed by screws (not shown) to a metal chassis 10 or a heat radiating plate provided in a device such as a mobile phone or a car navigation system on which the display device 1 is mounted. Is done. Further, since the mounting portion 8a protrudes from the back surface of the frame 8, the circuit board 11 and the like of the display panel 2 are attached to the frame 8
The frame 8 and the chassis 10 can be easily connected while avoiding the circuit board 11 and the like even if they are arranged around the frame.

In the display device 1 having the above-described configuration, light emitted from the light source 7 enters the light guide 6 and is guided, and irradiates the display panel 2 as a planar light source that is planarly light diffused. The light guided through the light guide 6 and reflected by the inclined back surface 6b is uniformly emitted from the emission surface 6a. The light emitted from the light guide 6 illuminates the display panel 2. Thereby, an image is displayed on the display panel 2.

The heat of the light source 7 is transmitted to the metal frame 8, and the chassis 10 is connected via the mounting portion 8a.
Since heat is radiated from the heat dissipation efficiency, the heat dissipation efficiency can be improved.

According to this embodiment, since the frame 8 that holds the light source 7 for the lighting device 3 is made of a cast metal, there is no need to provide a metal frame such as the lower bezel 5 (see FIG. 6) on the back surface of the lighting device 3. The number of parts can be reduced, and the strength of the frame 8 can be improved to improve the strength of the lighting device 3. Further, the heat of the light source 7 is radiated through the metal frame 8 and the frame 8
Therefore, the heat capacity increases and the heat from the light source 7 is difficult to accumulate. Therefore,
The heat dissipation of the lighting device 3 can be improved. In addition, the frame 8 of the same shape by casting
Can be produced in large quantities at a low cost, and an increase in the cost of the frame 8, the illumination device 3, and the display device 1 can be suppressed.

Next, FIG. 3 is a side sectional view showing an outline of the display device of the second embodiment. For convenience of explanation,
The same parts as those in the first embodiment shown in FIGS. 1 and 2 are given the same reference numerals. The difference from the first embodiment is that the mounting portion 8a provided on the frame 8 is provided at a position close to the light source 7 serving as a heat generating portion. Other parts are the same as those in the first embodiment.

According to the present embodiment, the same effects as those of the first embodiment can be obtained, and the mounting portion 8a and the light source 7 are provided close to each other, so that the heat of the light source 7 can be radiated more reliably through the mounting portion 8a. be able to. In the first and second embodiments, when a cold cathode tube is arranged instead as the light source 7, the amount of heat radiation is larger than that of the LED, which is effective.

Next, FIG. 4 is a side sectional view schematically showing the display device of the third embodiment. For convenience of explanation,
The same parts as those in the first embodiment shown in FIGS. 1 and 2 are given the same reference numerals. The difference from the first embodiment is that the light source 7 is formed of a cold cathode tube, and the mounting portion 8a is protruded from the side wall of the frame 8 on the side where the light source 7 is located. In other words, the mounting portion 8 c that protrudes from the surface of the frame 8 is provided on the side opposite to the side where the light guide 6 is disposed with respect to the light source 7 (the side where the light source 7 emits light toward the light guide 6). ing. Other parts are the same as those in the first embodiment.

According to the present embodiment, the same effect as that of the first embodiment can be obtained, and since the mounting portion 8a and the light source 7 are provided close to each other, the heat from the generated light source 7 is more reliably transmitted through the mounting portion 8a. Can dissipate heat. In addition, you may comprise the light source 7 by LED similar to 1st, 2nd embodiment. In the first to third embodiments, the light guide 6 may have a rectangular cross section similar to the conventional example shown in FIG.

Next, FIG. 5 is a side sectional view schematically showing the display device of the fourth embodiment. For convenience of explanation,
The same parts as those in the first embodiment shown in FIGS. 1 and 2 are given the same reference numerals. The difference from the first embodiment is a direct-type illumination device 3 in which a light source 7 composed of a cold cathode tube is arranged on the back surface of a light guide 6 having a rectangular cross section. Accordingly, the light source 7 composed of a cold cathode tube is disposed on the opposite side of the light guide 6 from the side on which the display panel 2 is disposed. On the bottom surface on the inner side of the frame 8, a reflection surface that collects the light emitted from the light source 7 and reflects it to the light guide 6 side is formed. The surface of the reflecting surface has a parabolic surface (curved surface) 8d bent in the direction of the curved surface of the tube of the cold cathode tube, and the light emitted from the light source 7 arranged at the focal point of the parabolic surface 8d is parabolic surface 8d. And is guided to the light guide 6. Accordingly, the portion of the frame 8 having the paraboloid (curved surface) 8d has a continuously different thickness, and the mounting portion 8a has a portion with a small thickness (or a portion thereof that overlaps the arranged light source in plan view). In the rear surface of the frame). Other parts are the first
This is the same as the embodiment.

According to the present embodiment, the same effect as that of the first embodiment can be obtained, and the mounting portion 8a and the light source 7 disposed in the central portion of the frame 8 are provided close to each other, so that the heat of the light source 7 is transferred to the mounting portion. 8a
It is possible to radiate heat more reliably through the.

The present invention can be used for an illumination device that illuminates a display panel and a display device having the illumination device.

Side surface sectional drawing which shows the display apparatus of 1st Embodiment of this invention. The partial perspective view which shows the display apparatus of 1st Embodiment of this invention. Side surface sectional drawing which shows the display apparatus of 2nd Embodiment of this invention. Side surface sectional drawing which shows the display apparatus of 3rd Embodiment of this invention. Side surface sectional drawing which shows the display apparatus of 4th Embodiment of this invention. Side sectional view showing a conventional display device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Display panel 3 Illumination apparatus 4 Upper bezel 5 Lower bezel 6 Light guide 6a Output surface 6b Opposing surface 7 Light source 8 Frame 8a Mounting part 8c Inclined surface 10 Chassis 11 Circuit board

Claims (11)

A light source, a light guide that guides light from the light source and emits the light in a planar shape, and a frame formed of a cast metal body that houses the light source and the light guide on the inner surface side, A lighting device comprising: The lighting device according to claim 1, wherein a convex boss protruding from the surface is provided on an outer surface of the frame. The lighting device according to claim 2, wherein the convex boss is an attachment portion provided to be connected and fixed to the outside. The light source is disposed on the end surface side of the light guide, and the convex boss provided on the outer surface of the frame is provided on the side surface of the frame on the side where the light source is disposed. The lighting device according to claim 2 or claim 3, wherein The light source is disposed on the side of the end face of the light guide, and the convex boss provided on the outer surface of the frame has the light source more than the side of the light guide on which the light source is not disposed. 4. The lighting device according to claim 2, wherein the lighting device is provided on a back surface of the frame so as to be brought close to a side where the frame is disposed. The light source is disposed on the back surface side opposite to the light exit surface of the light guide, and the frame has a curved surface on the inner surface side, and has a convex shape provided on the outer surface of the frame. The boss
The lighting device according to claim 2, wherein the lighting device is provided on a back surface of the frame. 7. The light guide according to claim 1, wherein a back surface facing the light exit surface is inclined with respect to the light output surface, and the frame has an inclined surface facing the back surface. The lighting device described. 8. The frame according to claim 1, wherein the frame is made of aluminum.
The lighting device according to item. 9. A display device comprising a display panel on an exit surface side of the illumination device according to claim 1. An illuminating device frame comprising an illuminating device frame that illuminates a display panel and holds a light source, wherein the illuminating device frame is made of a cast metal body.   The frame for lighting device according to claim 10, wherein the frame is made of aluminum.

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