JP2007042338A - Lighting system, electro-optic device, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system excellent in heat dissipation while achieving thinning and a narrow frame. <P>SOLUTION: This lighting system is composed of a light guide plate, a plurality of light sources, and a metal frame. LEDs are used for the plurality of light sources. The metal frame is to house the light guide plate, and a plurality of insertion ports for inserting the plurality of light sources are provided on its end face. The plurality of light sources are inserted into the plurality of insertion ports from the outside. Since the lighting system is structured so that the plurality of light sources are inserted from the outside, the total lighting system can be narrowly framed, and the thickness of the light guide plate can be also thinned. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lighting device that can be narrowed and thinned.

  In the liquid crystal display device, a backlight is provided on the back side of the liquid crystal display panel in order to perform transmissive display. In general, the backlight is configured as a lighting device including a light source such as an LED (Light Emitting Diode) and a light guide plate that irradiates the back surface of the liquid crystal display panel with light from the light source as planar light. . As such a backlight method, a method called an “edge light method” in which a light source is provided on an end face of a light guide plate is the mainstream.

  Among backlights, an in-vehicle backlight is larger than a portable backlight, and high luminance is required. However, an LED used as a light source for an existing portable backlight has a small amount of light and is uneasy in terms of reliability. Therefore, it is not appropriate to use such an LED as a light source for a vehicle-mounted backlight. For this reason, a power LED (hereinafter referred to as an LED) is a power LED that can increase the input current and thereby emit a high luminance. Is used).

  However, when this input current is increased, the junction temperature in the LED rises in proportion thereto, causing a change in LED characteristics and a decrease in reliability. Therefore, in order to lower the junction temperature, it is necessary to provide the backlight with a structure for radiating the heat generated in the LED.

  In Patent Document 1, instead of the edge light method, the LEDs are dispersed and arranged directly below the light guide plate, thereby preventing a local temperature increase that has occurred in the edge light method.

JP 2002-298629 A

  In order to dissipate the heat generated in the LED by the edge light method, it is necessary to dissipate the heat by mounting the LED on a metal substrate such as aluminum, but if a metal substrate is used, the wiring of the LED formed on the metal substrate Since the pattern needs to be protected, the outer shape of the metal substrate inevitably increases. Therefore, when a metal substrate is stored in a metal frame, there is a problem that the metal frame itself becomes large.

  This invention is made | formed in view of said point, and makes it a subject to provide the illuminating device excellent in heat dissipation while aiming at thickness reduction and a narrow frame.

  In one aspect of the present invention, an illumination device includes a light source, a light guide plate, and a metal frame that houses the light guide plate and has an insertion port for inserting the light source into an end surface thereof, Is inserted into the outlet.

  Said illuminating device is comprised from a light source, a light-guide plate, and a metal frame. An LED is used as the light source. The said metal frame is for accommodating the said light-guide plate, The insertion port for inserting the said light source is provided in the end surface. The light source is inserted into the insertion port. As described above, by adopting a structure in which the light source is inserted from the outside of the metal frame, it is possible to narrow the frame of the entire lighting device, and also to reduce the thickness of the light guide plate.

  In one aspect of the illumination device, the light source is detachable from the insertion port. By doing in this way, even if some trouble occurs in the light source, it becomes possible to replace only the light source from the illumination device.

  In one aspect of the above illumination device, the light source is mounted on a metal substrate. By doing in this way, the heat generated in the light source can be radiated by the metal substrate.

  In another aspect of the above lighting device, the metal substrate is adhered and adhered to the metal frame by an adhesive sheet having insulating properties and thermal conductivity. By doing in this way, the heat generated by the light source is transmitted from the metal substrate to the metal frame, and the heat transmitted to the metal frame is radiated to the outside. That is, in the illuminating device of the present invention, the heat generated by the light source can be radiated to the outside by the entire illuminating device.

  In the other one aspect | mode of said illuminating device, the cover plate which has a frame-shaped planar shape is attached to the said metal frame. The lid plate is for fixing the light guide plate to the metal frame. Since the cover plate is attached to the metal frame, the heat generated in the light source can be radiated by the cover plate.

  In another aspect of the illumination device, a planar shape of an edge of the metal frame between the insertion ports is formed in a substantially triangular shape, and the lid plate is formed in the substantially triangular shape. Fixed to the edge of the frame. Accordingly, the lid plate can be fixed to the metal frame without changing the overall size of the lighting device and without affecting the light path in the lighting device.

  In a preferred embodiment of the above lighting device, the planar shape of the edge of the metal frame between the insertion ports is formed in a substantially triangular shape, and the edge of the metal frame formed in the substantially triangular shape is A screw hole is provided at the center, and the cover plate is attached to the metal frame by inserting a screw through the screw hole from the bottom surface of the metal frame to the cover plate.

  In a preferred embodiment of the above lighting device, the edge of the metal frame between the insertion openings is formed in a substantially triangular shape and a recess is provided, and the lid plate is formed of the metal frame. A convex portion is provided at a portion corresponding to the edge of the metal frame, and the concave portion of the metal frame is fitted with the convex portion of the lid plate.

  In the other one aspect | mode of said illuminating device, the said cover plate is formed in the crown shape which covers the said metal frame and the said light source, and the said metal substrate and the said metal frame are covered with the said cover plate. Thereby, the heat generated by the light source can be directly transmitted to the lid plate, and the heat radiation efficiency can be improved.

  In the other one aspect | mode of said illuminating device, the said metal frame is provided with the said insertion port in the both ends. Thereby, the said light source which can be attached or detached can be inserted with respect to the insertion port of both ends.

  In another aspect of the present invention, an electro-optical device having a display panel and an illumination device used as a backlight of the display panel can be configured. Here, the electro-optical device is, for example, a liquid crystal display device. The lighting device of the present invention can be used as the lighting device.

  In still another aspect of the present invention, an electronic apparatus including the above liquid crystal display device in a display portion can be configured.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the present invention is applied to a liquid crystal display device.

[Configuration of liquid crystal display device]
First, the configuration of a liquid crystal display device according to an embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a cross-sectional view showing a cross-sectional configuration of a liquid crystal display device 100 according to the present embodiment. In FIG. 1, the liquid crystal display device 100 includes a liquid crystal display panel 10 and an illumination device 30 that functions as a backlight of the liquid crystal display panel 10.

  First, the liquid crystal display panel 10 will be described. The liquid crystal display panel 10 is configured by forming a cell structure by bonding an upper substrate 1 and a lower substrate 2 such as glass through a sealing material 3 and enclosing a liquid crystal layer 4 therein. In addition, the liquid crystal display panel 10 includes many other components such as a black matrix, a color filter, electrodes, and the like, which are formed in a matrix (lattice) or a stripe (line). These components are formed substantially in parallel on the four sides of the rectangular liquid crystal display panel 10. In the liquid crystal display device 100 according to the present embodiment, the configuration of the liquid crystal display panel 10 is not limited to a specific one.

Next, the lighting device 30 will be described. The illumination device 30 mainly includes a light source unit 20 and a light guide plate 11. The light guide plate 11 is made of a transparent resin such as an acrylic resin, and has a rectangular planar shape. The light source unit 20 is installed on the end surface 11 c at one end of the light guide plate 11. The light source unit 20 is mainly composed of a plurality of LEDs (Light Emitting Diodes) 15 which are light sources of the lighting device 30 and a metal substrate 14 on which a circuit of the LEDs 15 is mounted. As the LED 15, a thin top view type power LED is used.
The LED 15 emits light L, and the emitted light L enters the light guide plate 11 from the end face 11c. As shown in FIG. 1, the light guide plate 11 has a wedge-shaped cross-sectional shape in which the plate thickness decreases as the distance from an end surface (hereinafter referred to as a light incident end surface) 11 c where light emitted from the LED 15 enters is increased. Yes. The light L incident on the inside of the light guide plate 11 from the light incident end surface 11 c is repeatedly reflected on the reflection surface 11 b and the light exit surface 11 a of the light guide plate 10. When the angle between the light exit surface 11a and the light L exceeds the critical angle, the light L passes through the light exit surface 11a and exits to the outside. The light L emitted from the light exit surface 11 a passes through the liquid crystal display panel 10. At this time, by controlling the orientation of the liquid crystal layer 4, a desired display image is visually recognized by an observer.

(Configuration of lighting device)
Next, a specific configuration of the lighting device 30 will be described with reference to FIG. FIG. 2 is a perspective view of the illumination device 30 according to the present embodiment. As shown in FIG. 2, the light guide plate 11 is housed in a metal frame 12 that is a box-shaped container made of metal such as aluminum. After the light guide plate 11 is accommodated in the metal frame 12, a lid plate 13 that functions as a lid of the metal frame 12 is attached to the metal frame 12. The planar shape of the cover plate 13 is a frame shape in order to emit light L from the light guide plate 11 toward the liquid crystal display panel 10. The light guide plate 11 is fixed to the metal frame 12 by attaching the cover plate 13 to the metal frame 12. As a material of the cover plate 13, a metal such as plastic or aluminum is used.

The metal frame 12 is provided with a plurality of insertion ports 12a on its end face. The size of one insertion port 12a is set to a size that allows one LED 15 to be inserted. The light source unit 20 is attached to the end surface of the metal frame 12 by inserting the plurality of LEDs 15 into the plurality of insertion ports 12 a from the outside of the metal frame 12. As shown in FIG. 2, by attaching the light source unit 20 to the end surface of the metal frame 12, the light exit of the LED 15 is directed to the light incident end surface 11 c of the light guide plate 11 inside the metal frame 12. Become.
Since the LED 15 is detachable from the insertion port 12 a, the light source unit 20 can be detached from the metal frame 12. Therefore, even if some trouble occurs in the light source unit 20, it is possible to remove and replace only the light source unit 20 from the illumination device 30. In addition, since the size of the lighting device used in the vehicle is determined to some extent, the light source unit 20 can be used in a plurality of types of lighting devices by making it an independent module in this way. Can do. Furthermore, since the LED can be purchased separately from the backlight manufacturer, the cost can be reduced.
Next, the size of the lighting device 30 according to the present embodiment will be described in comparison with the size of a general lighting device.

  Fig.3 (a) has shown sectional drawing of the illuminating device 30 which concerns on this embodiment. FIG.3 (b) has shown sectional drawing of the general illuminating device 30a. FIG. 4 shows an enlarged view of the light source unit 20 in the illumination device 30 according to the present embodiment.

  As will be described in detail later, as shown in FIG. 4, the LED 15 is bonded to the metal substrate 14 by an adhesive sheet 16. The metal substrate 14 is formed by cutting out in advance a portion where the circuit pattern of the LED 15 is formed on the surface from a sheet metal on which the circuit pattern of the LED 15 is formed. At this time, it is necessary to protect the circuit pattern of the LED 15 formed on the surface so as not to be crushed. Therefore, the size Ph of the outer shape of the metal substrate 14 to which the LED 15 is attached is formed larger than the size Lh of the LED 15.

  As shown in FIG. 3B, the general lighting device 30 a has a structure in which the light source unit 20 is housed in the metal frame 12 together with the light guide plate 11. Therefore, in the general lighting device 30a, it is necessary to form the metal frame 12 in accordance with the size of the outer shape of the metal substrate 14.

  On the other hand, the illuminating device 30 according to the present embodiment has a structure in which the LED 15 is inserted from the insertion port 12a of the metal frame 12 as shown in FIG. Therefore, as shown in the enlarged view of the light source unit 20 in FIG. 4, the thickness Ld of the LED 15 absorbs the thickness d1 of the edge of the metal frame 12 by inserting the LED 15 through the insertion port 12a of the metal frame 12. can do. In addition, the size Ph of the outer shape of the metal substrate 14 can absorb the thickness d2 of the bottom surface of the metal frame 12 by attaching the metal substrate 14 from the outside of the metal frame 12.

  Here, with respect to the general lighting device 30a and the lighting device 30 according to the present embodiment, specific comparative examples of dimensions when both the same metal substrate 14 and LED 15 are used will be described. As shown in FIG. 3B, when the length from the end face of the general lighting device 30a, that is, the end face of the metal frame 12 to the light incident end face 11c of the light guide plate 11, is about 3.0 mm. The length from the end face in the illumination device 30 according to the present embodiment shown in FIG. 5A, that is, the length from the metal substrate 14 to the light incident end face 11c of the light guide plate 11, is the thickness Ld of the LED 15 and the thickness d1 of the edge of the metal frame 12. Is about 2.0 mm. Further, as shown in FIG. 3B, when the height from the bottom surface of the metal frame 12 to the LED 15 in the general lighting device 30a is about 1.5 mm, the book shown in FIG. In the lighting device 30 according to the embodiment, the height from the bottom surface of the metal frame 12 to the LED 15 is about 0.5 mm because the size Ph of the outer shape of the metal substrate 14 absorbs the thickness d2 of the bottom surface of the metal frame 12. It becomes. Therefore, in the illuminating device 30 according to the present embodiment, by adopting a structure in which the LED 15 is inserted from the outside, the thickness of the entire illuminating device and the size of the frame can be reduced as compared with a general illuminating device. In addition, the frame of the entire lighting device 30 can be reduced. Moreover, in the illuminating device 30 which concerns on this embodiment, as shown in FIG.3 (b), compared with a general illuminating device, the position of LED15 becomes a low position, ie, the position of LED15 is the metal frame 12. Accordingly, the light guide plate 11 can be made thinner accordingly.

  Further, the illumination device 30 according to the present embodiment has a structure in which only the light guide plate 11 is accommodated in the metal frame 12, unlike a general illumination device 30 a that accommodates the light guide plate 11 together with the metal substrate 14 and the LEDs 15. Therefore, since the metal frame 12 is formed in accordance with the size of the light guide plate 11, when the light guide plate 11 is housed in the metal frame 12, it is stably fixed.

  Next, the detailed structure of the light source unit 20 will be specifically described with reference to FIG. As described above, the light source unit 20 is mainly composed of the plurality of LEDs 15 and the metal substrate 14. A wiring circuit of the LED 15 is mounted on one substrate surface 14 a of the metal substrate 14.

  In order to emit high-luminance light from the LED 15, it is necessary to increase the input current flowing through the LED 15. However, as described above, when the input current passed through the LED 15 is increased, the junction temperature in the LED 15 is increased in proportion thereto, causing a change in characteristics and a decrease in reliability. Therefore, in order to lower the junction temperature, it is necessary to provide the lighting device 30 with a structure for radiating the heat generated in the LED 15.

  In the lighting device 30 according to the present embodiment, the metal substrate 14 is formed of a metal having high thermal conductivity such as aluminum. An adhesive sheet 16 that insulates electricity and has high thermal conductivity is attached to one substrate surface 14a of the metal substrate 14. The LED 15 is adhered and adhered to the metal substrate 14 by the adhesive sheet 16. Further, the metal substrate 14 is adhered and adhered to the metal frame 12 by the adhesive sheet 16. The reason why the adhesive sheet 16 needs to be insulated is that the circuit pattern of the LED 15 is formed on one substrate surface 14 a of the metal substrate 14, so that the space between the metal substrate 14 and the metal frame 12 is electrically connected. This is because it is necessary to insulate. In FIG. 4, the flow of heat generated in the LED 15 in the lighting device 30 configured as described above is indicated by broken-line arrows. The heat generated in the LED 15 is transmitted from the LED 15 to the metal substrate 14 via the adhesive sheet 16 and further from the metal substrate 14 to the metal frame 12. Further, since the LED 15 is in direct contact with the metal frame 12 at the insertion port 12a, the heat generated in the LED 15 is transmitted to the metal frame 12 also from a portion where the LED 15 and the metal frame 12 are in contact with each other. Furthermore, since the cover 12 is attached to the metal frame 12 as shown in FIG. Therefore, the heat transmitted to the metal frame 12 is also transmitted to the cover plate 13. Since the metal substrate 14, the metal frame 12, and the cover plate 13 are in contact with the outside air, the heat transmitted to the metal substrate 14, the metal frame 12, and the cover plate 13 is radiated to the outside of the lighting device 30. Therefore, as the material of the cover plate 13, a metal such as aluminum is preferable to plastic because it has a higher thermal conductivity than plastic. Thus, the illuminating device 30 according to the present embodiment can dissipate the heat generated in the LEDs 15 by the metal substrate 14, the metal frame 12, and the cover plate 13, that is, the entire surface of the illuminating device 30.

(How to attach the lid to the metal frame)
Next, a method for fixing the cover plate 13 to the metal frame 12 in which the light guide plate 11 is housed will be described in detail. As a method of fixing the lid plate 13 to the metal frame 12, a general method such as adhesion or welding is naturally conceivable, but here, the reusability of the light guide plate 11, the metal frame 12 and the lid plate 13 is considered. In consideration of the above, a method for fixing the cover plate 13 to the metal frame 12 with screws will be described.

  As a general method for fixing the cover plate 13 to the metal frame 12, a method of fixing the cover plate 13 by providing a screw hole in the edge of the metal frame 12 and inserting a screw into the provided screw hole is considered. In this case, however, a certain thickness is required as the thickness of the edge of the metal frame 12. If the thickness is not constant, the metal frame 12 is cracked when the screw is passed through. In the worst case, the crack causes the cover plate 13 to drop off. However, increasing the thickness of the edge of the metal frame 12 is not preferable from the viewpoint of reducing the size and weight of the entire lighting device 30.

  5A and 5B are plan views of the lighting device 30. FIG. Here, the alternate long and short dash line in the figure indicates the direction in which the light L emitted from the LED 15 diffuses. In addition, illustration of the light-guide plate 11 is abbreviate | omitted for convenience of explanation. As shown in FIG. 5A, the light L emitted from the LED 15 does not diffuse immediately. Therefore, unevenness of light occurs between the plurality of LEDs 15, that is, between the plurality of insertion openings 12 a of the metal frame 12, and a shadow Ba called a so-called hot spot phenomenon occurs. Therefore, in the illumination device 30 according to the present embodiment, a screw hole for fixing the lid plate 13 is formed using the portion of the shadow Ba generated by this hot spot phenomenon. Specifically, as shown in FIG. 5B, the thickness of the edge of the metal frame 12 between the plurality of insertion openings 12a in the metal frame 12 is increased, and the planar shape of the edge portion is further increased. It is formed in a substantially triangular shape. The reason why the planar shape of the edge of the metal frame 12 between the plurality of insertion openings 12a is substantially triangular is that it is matched with the shape of the portion of the shadow Ba caused by the hot spot phenomenon. A screw hole 17 penetrating to the bottom surface of the metal frame 12 is formed at the center of the edge of the metal frame 12 between the plurality of insertion openings 12a formed in a substantially triangular shape.

  FIG. 6 is a schematic diagram when the cover plate 13 is fixed to the metal frame 12. In FIG. 6, illustration of the light guide plate 11 and the light source unit 20 is omitted for convenience of explanation. As shown in FIG. 6, after the lid plate 13 is placed on the metal frame 12, the screw 18 is inserted into the screw hole 17 from the bottom surface of the metal frame 12 and penetrates to the lid plate 13. Thus, by fixing the cover plate 13 to the edge of the metal frame 12 formed in a substantially triangular shape, the size of the light L in the lighting device 30 can be changed without changing the overall size of the lighting device 30. The lid plate 13 can be fixed to the metal frame 12 without affecting the path.

  Further, instead of the method of attaching the cover plate 13 to the metal frame 12 with a screw, a recess is provided in the edge portion of the metal frame 12 whose planar shape is formed in a substantially triangular shape, and corresponds to the edge portion of the metal frame 12. It is good also as providing a convex part in the part of the cover board 13, and fitting the recessed part of the metal frame 12 to the convex part of the cover board 13. FIG.

  Furthermore, the method of attaching the cover plate 13 to the metal frame 12 is not limited to the method described above. Instead of the method described above, the lid plate 13 may be formed in a crown shape, and the entire metal frame 12 and the light source unit 20 may be covered with the lid plate 13. FIG. 7 shows a schematic diagram when the crown-shaped lid plate 13 is attached to the metal frame 12, and FIG. 8 shows a cross-sectional view of the illumination device 30 when the crown-shaped lid plate 13 is attached to the metal frame 12. . As shown in FIGS. 7 and 8, in this case, the cover plate 13 is put on the metal frame 12 to which the light source unit 20 is attached. As a result, the substrate surface 14 b opposite to the substrate surface 14 a of the metal substrate 14 comes into contact with the cover plate 13. Thereby, the heat generated by the LED 15 can be transmitted to the cover plate 13 through the substrate surface 14 b of the metal substrate 14, and can be radiated by the cover plate 13. Thereby, the thermal radiation efficiency of the illuminating device 30 whole can be improved more.

[Modification]
In the lighting device 30 according to this embodiment described above, the light guide plate 11 is a light guide plate having a so-called wedge-shaped cross-sectional shape. However, the light guide plate 11 is not limited to a light guide plate having a wedge-shaped cross-sectional shape, but a light guide plate having a rectangular cross-sectional shape can be used instead.

  Moreover, although the insertion port 12a which attaches the light source part 20 shall be formed in the end surface of the metal frame 12, it is not restricted to this. FIG. 9 is a schematic diagram when insertion holes are provided on both end faces of the metal frame. As shown in FIG. 9, the insertion port 12 a may be provided not only on one end surface of the metal frame 12 but also on both end surfaces of the metal frame 12. Thereby, the removable light source part 20 can be attached to the insertion port 12a provided in the both end surfaces of the metal frame 12.

[Electronics]
Next, a specific example of an electronic apparatus to which the liquid crystal display device 100 according to this embodiment can be applied will be described with reference to FIG.

  First, an example in which the liquid crystal display device 100 according to the present embodiment is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 10A is a perspective view showing the configuration of this personal computer. As shown in the figure, the personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the electro-optical device 100 according to the present invention is applied.

  Next, an example in which the liquid crystal display device 100 according to the present embodiment is applied to a display unit of a mobile phone will be described. FIG. 10B is a perspective view showing the configuration of this mobile phone. As shown in the figure, the mobile phone 720 includes a plurality of operation buttons 721, a receiver 722, a transmitter 723, and a display unit 724 to which the liquid crystal display device 100 according to the present embodiment is applied.

  Electronic devices to which the liquid crystal display device 100 according to the present embodiment can be applied include a liquid crystal television, a view, in addition to the personal computer shown in FIG. 10A and the mobile phone shown in FIG. Examples include a finder type / monitor direct-view type video tape recorder, a car navigation device, a pager, an electronic notebook, a calculator, a word processor, a workstation, a videophone, a POS terminal, and a digital still camera.

1 is a cross-sectional view illustrating a configuration of an electro-optical device according to an embodiment. It is a perspective view of the illuminating device which concerns on this embodiment. Sectional drawing of the illuminating device which concerns on this embodiment, and a general illuminating device is shown. The enlarged view of the light source in the illuminating device which concerns on this embodiment is shown. The top view of the illuminating device which concerns on this embodiment is shown. It is a schematic diagram of an illuminating device when a cover plate is fixed to a metal frame. It is a schematic diagram of an illuminating device when a crown-shaped cover plate is attached. It is sectional drawing of the illuminating device in FIG. It is a schematic diagram when an insertion port is provided in the both end surfaces of the metal frame. It is a figure which shows the example of the electronic device to which the liquid crystal display device of this embodiment is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 Light guide plate, 12 Gold frame, 13 Cover plate, 14 Metal substrate, 15 LED, 20 Light source part, 30 Illumination device, 100 Liquid crystal display device

Claims (12)

A light source;
A light guide plate;
A metal frame that houses the light guide plate and is provided with an insertion port for inserting the light source into an end surface;
The illumination device, wherein the light source is inserted into the insertion port.   The lighting device according to claim 1, wherein the light source is detachable from the insertion port.   The lighting device according to claim 1, wherein the light source is mounted on a metal substrate.   The lighting device according to claim 3, wherein the metal substrate is adhered and adhered to the metal frame by an adhesive sheet having insulating properties and thermal conductivity.   The lighting apparatus according to claim 1, wherein a cover plate having a frame-like planar shape is attached to the metal frame. The plane shape of the edge of the metal frame between the insertion ports is formed in a substantially triangular shape,
The lighting device according to claim 5, wherein the cover plate is fixed to an edge of the metal frame formed in the substantially triangular shape. The plane shape of the edge of the metal frame between the insertion ports is formed in a substantially triangular shape,
The edge of the metal frame formed in the substantially triangular shape has a screw hole at the center thereof,
The lighting device according to claim 5, wherein the cover plate is attached to the metal frame by inserting a screw from the bottom surface of the metal frame to the cover plate through the screw hole. The edge of the metal frame between the insertion openings is formed in a substantially triangular shape and a recess is provided,
The cover plate is provided with a convex portion at a portion corresponding to the edge of the metal frame,
The illumination device according to claim 5, wherein the concave portion of the metal frame is fitted with the convex portion of the lid plate. The lid plate is formed in a crown shape covering the metal frame and the light source,
The lighting device according to claim 5, wherein the metal substrate and the metal frame are covered with the lid plate.   The lighting device according to claim 1, wherein the insertion hole is provided at both ends of the metal frame. A display panel;
An illuminating device according to any one of claims 1 to 10, which is used as a backlight of a display panel.   An electronic apparatus comprising the electro-optical device according to claim 11 in a display unit.

Images