JP2007115508A - Lighting apparatus, electro-optical apparatus and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting apparatus in which an efficient heat discharging structure can be provided in a small space. <P>SOLUTION: The lighting apparatus has an LED 25 which emits light, a light guide body 19 and a first case 16. The light guide body 19 has a light-emitting face 19a and a light-incident face 19b and a rear face 19c which faces the light-emitting face. The rear face 19c has an inclined face. The first case 16 has thermal conductivity and is provided so as to contact the LED 25 and cover the rear face 19c of the light guide body 19. Between the first case 16 and the light guide body 19 is formed a wedge-shape inner space R. On the first case 16 is provided at least one of openings 23a, 23b which connects the inner space R with the outer space. Because of the conductivity of the first case 16 and air convection created in the inner space R through the opening 23a, 23b, the heat of the LED 25 can be radiated efficiently, and as a result, the LED 25 will be cooled down. As the LED 25, a power LED of a high luminance with a large input current can be used. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an illumination device that emits light generated by a light source to the outside through a light guide. The present invention also relates to an electro-optical device using the illumination device. The present invention also relates to an electronic apparatus using the electro-optical device.

  Currently, electro-optical devices such as liquid crystal display devices, organic EL (Electro Luminescence) devices, and plasma display devices are widely used in various electronic devices such as car navigation devices, mobile phones, and portable information terminals. Among electro-optical devices, as represented by a liquid crystal display device, there are devices that display images such as letters, numbers, figures, etc. by controlling light emitted from an illumination device.

  For example, regarding an electro-optical device used in a bright environment such as a car navigation device, high-luminance light is emitted from the illumination device in order to provide a clear image to the viewer. Is required. When a point light source such as an LED (Light Emitting Diode) is used as the light source of the illumination device, in order to realize the above-described high-luminance outgoing light, the input current is large, for example, the input current is about 50 mA to 350 mA. It is necessary to use LEDs, so-called power LEDs.

  Since such a power LED has a large input current, high-temperature heat is generated and the heat may adversely affect the LED itself. In order to avoid this, the lighting device must have a heat dissipation structure. is there. 2. Description of the Related Art Conventionally, an illumination device having a heat dissipation structure in which a heat sink is attached to a light guide is known (see, for example, Patent Document 1).

JP-A-2004-171948 (page 10, FIG. 7)

  However, the illumination device disclosed in Patent Document 1 requires a large space for providing a heat sink having a complicated shape. The size of the illumination device, the size of the electro-optical device using the illumination device, and therefore, the use of them. There was a problem that the size of the electronic device had to be very large.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an illumination device, an electro-optical device, and an electronic apparatus that can provide an efficient heat dissipation structure in a small space. .

  The illumination device according to the present invention includes (1) a light source that emits light, (2) a light emission surface, a light incident surface that is a side surface adjacent to the light emission surface, and a surface that faces the light emission surface. A light guide that has a back surface, introduces light emitted from the light source from the light incident surface, and emits the light from the light exit surface; and (3) the light source in contact with the light source in contact with the light source. A first case provided in a state of covering the back surface of the light guide, forming an internal space with the light guide, and having thermal conductivity; (4) the first case is the inner case It has at least one opening that connects the space to the external space of the first case.

  According to this illuminating device, an air flow, that is, convection is generated from the external space to the internal space through the opening provided in the first case, and the heat generated in the first case is generated in the light source that contacts the first case. Heat can be dissipated efficiently. Moreover, since the illuminating device of this invention utilizes the convection which flows through internal space, a large space is not required, Therefore, an illuminating device can be formed small.

  In the above configuration, the light source is preferably a light source having a large input current and a high luminance of emitted light, for example, a power LED. The power LED operates by receiving an input current of 50 mA to 350 mA, for example. The light guide is a resin molded part formed by molding a transparent resin material, for example, and is a light guide formed in a so-called wedge shape in which the opposite surface of the light emitting surface is inclined. The first case can be formed of a material having thermal conductivity, for example, aluminum (Al). One or more openings may be provided in the first case.

  Next, in the lighting device according to the present invention, it is desirable that the at least one opening includes two openings, an air inflow opening and an air outflow opening. In this way, a preferable air convection can be formed in the internal space, and effective heat dissipation can be realized. In this case, it is preferable that the intake inflow opening is provided at a position closer to the light source than the air outflow opening. If it carries out like this, the heat of a light source can be thermally radiated efficiently.

  Next, in the illumination device according to the present invention, it is preferable that the air outlet opening is provided on a side surface of the first case. In this way, a preferable air convection can be formed in the internal space, and effective heat dissipation can be realized.

  Next, in the illumination device according to the present invention, it is desirable that a portion of the first case facing the light guide is parallel to the light exit surface of the light guide. In general, when an inclined portion is present in the outer shape of the lighting device, handling when the lighting device is gripped or the lighting device is attached to another device is deteriorated. On the other hand, if the outer shape portion of the first case is configured in parallel to the light exit surface of the light guide as in the present invention, the handleability of the lighting device can be improved.

  Next, the lighting device according to the present invention preferably further includes a heat transfer means for transferring heat of the first case to other portions. This heat transfer means can be, for example, a simple bar member, a plate member, a block member, or any other shape formed of a metal material having thermal conductivity. Further, the heat transfer means can be constituted by, for example, a so-called heat pipe.

  A heat pipe is a heat transfer element known per se, and a liquid medium that can be evaporated and condensed by heat is contained in a tube having a circular cross section, a tube having a square cross section, and other appropriate cross sectional shapes. A structure for liquid circulation, for example, a capillary structure is provided on the inner surface of the wall. If the heat transfer means is formed by a heat pipe, the heat dissipation effect of the first case can be further enhanced.

  Next, the illuminating device according to the present invention further includes a second case disposed between the light guide and the first case to support the light guide, and the internal space includes the second case. And the first case. By so doing, the internal space can be clearly formed by the second case.

  The second case is preferably formed of a synthetic resin, for example, a synthetic resin having light reflectivity, for example, a white synthetic resin. If it carries out like this, the light which leaks from a light guide will be reflected by this 2nd case, and it can use effectively for illumination. Further, by forming the second case from a synthetic resin, the internal space can be formed in any desired shape. Moreover, a screw hole can be easily provided in the second case. This screw hole can be used, for example, as a screw hole for mounting the wiring board on the lighting device, or as a screw hole for mounting the lighting device on an actual machine such as a car navigation device. Note that the screw holes are not necessarily limited to those formed of synthetic resin.

  Next, it is preferable that the lighting device according to the present invention further includes a third case that supports an object to be illuminated such as a liquid crystal panel and fits to a side portion of the first case. According to this configuration, the lighting device can be mounted at a simple and accurate position with respect to the object to be illuminated.

  Next, an electro-optical device according to the present invention includes an illumination device that emits light and an electro-optical panel that receives light emitted from the illumination device, and the illumination device has the configuration described above. It is characterized by being. Such an electro-optical device is, for example, a liquid crystal display device.

  According to the illuminating device of the present invention, as described above, air flows from the external space to the internal space through the opening provided in the first case, that is, convection occurs. Heat generated in the light source in contact with one case can be efficiently radiated. Moreover, since the illuminating device of this invention utilizes the convection which flows through space, a large space is not required, Therefore Therefore, an illuminating device can be formed small. Therefore, also in the electro-optical device of the present invention configured using the illumination device, heat can be efficiently radiated by a small heat radiating structure.

  Next, an electronic apparatus according to the invention includes the electro-optical device having the above-described configuration. As this electronic device, for example, a car navigation device, a mobile phone, a portable information terminal, and the like can be considered. According to the electro-optical device according to the present invention, as described above, heat can be efficiently radiated by the small heat dissipation structure. Can efficiently dissipate heat.

(First embodiment of illumination device and electro-optical device)
Hereinafter, an illumination device and an electro-optical device according to the present invention will be described based on embodiments. Of course, the present invention is not limited to this embodiment. Further, in the drawings to be used from now on, the dimensional ratio of each component may be different from the actual one.

  FIG. 1 shows an embodiment of an illumination device according to the present invention and an electro-optical device incorporating the illumination device. FIG. 2 shows the illumination device and the electro-optical device in an exploded state. FIG. 3 is a partially cutaway view of the lighting device. FIG. 4 shows a state in which the first case 16 which is the uppermost part is removed from the structure shown in FIG.

  In FIG. 1, an electro-optical device 1 according to this embodiment includes a lighting device 2 and an electro-optical panel 3. Reference numeral 4 denotes a wiring board belonging to an actual machine (for example, a car navigation device or a mobile phone). The electro-optical panel 3 and the wiring board 4 are connected by an FPC (Flexible Printed Circuit) board 5. In the present embodiment, a liquid crystal panel is used as the electro-optical panel 3. The electro-optical panel 3 is an object to be illuminated illuminated by the illumination device 2. By using a liquid crystal panel as the electro-optical panel 3, the electro-optical device of this embodiment is configured as a liquid crystal display device.

  The liquid crystal panel 3 includes a first substrate 8 and a second substrate 9. The first substrate 8 has a first translucent substrate 10 formed of translucent glass, translucent plastic, or the like, and a polarizing plate 11a is attached to the outer surface of the first translucent substrate 10. It is mounted by etc. Although not shown in detail on the inner surface of the first translucent substrate 10, a plurality of switching elements arranged in a matrix in the row direction X and the column direction Y as viewed from the direction of the arrow A, and their switching Various optical elements such as pixel electrodes and alignment films connected to the individual elements are provided.

  The second substrate 9 has a second translucent substrate 12 formed of translucent glass, translucent plastic, or the like, and a polarizing plate 11b is attached to the outer surface of the second translucent substrate 12. It is mounted by etc. Further, although not shown in detail on the inner surface of the second translucent substrate 12, each colored film of B (blue), G (green), and R (red) constituting the color filter, and a lattice surrounding them. Various optical elements such as a black mask, a counter electrode, and an alignment film are provided.

  A predetermined gap, a so-called cell gap, is formed between the first substrate 8 and the second substrate 9, and liquid crystal is injected into the cell gap to form a liquid crystal layer. In addition, a driving IC 13 is mounted on a portion of the first light transmissive substrate 10 that protrudes outside the second light transmissive substrate 12. By applying a predetermined voltage by the driving IC 13 between the pixel electrode on the first substrate 8 and the counter electrode on the second substrate 9, the orientation of the liquid crystal layer is controlled for each pixel, and the second substrate 9 Images such as letters, numbers, figures, etc. are displayed on the outside.

  The switching element provided on the first substrate 8 may be a two-terminal switching element such as a TFD (Thin Film Diode) element or a three-terminal switching element such as a TFT (Thin Film Transistor) element. The first substrate 8 may be a simple matrix type that does not use a switching element. When the TFD element is used, the counter electrode on the second substrate 9 side is a stripe electrode. When using a TFT element, the counter electrode on the second substrate 9 side is a planar common electrode. In the case of a simple matrix type liquid crystal panel, stripe electrodes are provided on both the first substrate 8 and the second substrate 9, and the stripe electrodes cross each other at right angles.

  Next, as illustrated in FIG. 2, the lighting device 2 includes a first case 16, a second case 17, and a third case 18. The second case 17 is accommodated in the first case 16. The third case 18 accommodates the first case 16 in a state where the second case 17 is accommodated. The illuminating device 2 has a substantially rectangular shape that is long in the vertical direction Y ′ corresponding to the column direction Y of the liquid crystal panel 3 and short in the horizontal direction X ′ corresponding to the row direction X of the liquid crystal panel 3. The first case 16 is made of a material having high thermal conductivity, for example, Al. Two openings 23 a and 23 b for ventilation are provided at appropriate positions of the first case 16. These openings 23a and 23b extend in the horizontal direction X 'as shown in FIG. As shown in FIG. 1, an internal space R is formed between the second case 17 and the first case 16 in a state where the second case 17 is accommodated in the first case 16. The internal space R has a shape corresponding to the shape of the second case 17 and is a wedge-shaped space in this embodiment.

  In FIG. 2, the second case 17 is formed of synthetic resin, that is, plastic. A screw hole 15 is provided at an appropriate position of the second case 17. The screw hole 15 can be formed at the same time when the second case 17 is formed by molding using plastic as a material. As shown in FIG. 4, a plurality of screw holes 15 are provided in the lateral direction X ′, two in this embodiment. In FIG. 2, the third case 18 is formed of plastic. The third case 18 has a side wall 22 around it, and accommodates the liquid crystal panel 3 in a region surrounded by the side wall 22.

  The lighting device 2 includes a light guide 19 between the second case 17 and the third case 18. The light guide 19 is formed by molding using a translucent resin as a material. The light guide 19 has a light emitting surface 19a, a light incident surface 19b which is a side surface adjacent thereto, and a back surface 19c. The back surface 19c is inclined so that the light incident surface 19b is thick and its opposing end surface is thin. A prism pattern or a dot pattern can be applied to the back surface 19 as necessary. An optical sheet group 20 is provided on the light emitting surface 19a as necessary. The optical sheet group 20 includes, for example, a light diffusion sheet provided in contact with the light guide 19 and a prism sheet stacked thereon. Further, a light reflecting sheet 21 is provided on the back surface 19c as necessary.

  An LED substrate 24 is provided on the inner surface of the side wall (the left side wall in FIG. 2) corresponding to the light incident surface 19 b of the light guide 19 among the side walls of the first case 16. A plurality of LEDs (Light Emitting Diodes) 25 are mounted on the LED substrate 24. The LED substrate 24 extends in the direction perpendicular to the paper surface of FIG. 2, and the plurality of LEDs 25 are arranged in a line on the LED substrate 24 in the direction perpendicular to the paper surface of FIG.

  The LED 25 is a so-called power LED that has a large input current and can emit high-luminance light. The input current of the power LED is an appropriate value within a range of 50 mA to 350 mA, for example. The LED substrate 24 is formed of a thin plastic or thin metal film, and a wiring pattern for supplying a current or the like to the LED 25 is formed on the surface or inside thereof. The LED substrate 24 is preferably formed of a material having high thermal conductivity. In addition, the LED substrate 24 is desirably bonded to the side wall of the first case 16 with an adhesive.

  The two openings 23a and 23b provided in the first case 16 have projecting pieces 28a and 28b, respectively. These projecting pieces extend obliquely from one side of the openings 23a and 23b. As shown in FIG. 3, the protruding piece 28 a closer to the LED 25 is inclined toward the outside of the first case 16 with the side of the opening 23 a far from the LED 25 as a base line. Further, the projecting piece 28b far from the LED 25 is inclined toward the inside of the first case 16 (that is, the internal space R) with the side of the opening 23b far from the LED 25 as a base line.

  The openings 23a and 23b are ventilation openings. When the LED 25 generates heat and becomes high temperature, air convection is formed in the internal space R through the openings 23a and 23b. In this case, the opening 23a on the side close to the LED 25, which is at a high temperature, becomes an intake port, and the opening 23b on the side far from the LED 25 becomes an exhaust port. The projecting piece 28a projecting obliquely toward the external space is in an inclined state suitable for introducing air into the internal space R. In addition, the projecting piece 28b extending obliquely toward the internal space R is in an inclined state suitable for discharging the air in the internal space R to the outside.

  The screw hole 15 is used as a female screw when the lighting device 2 is attached to an actual machine (for example, a car navigation device or a mobile phone) with a screw. The screw holes 15 can also be used as female screws when the wiring board 4 shown in FIG.

  Since the illumination device 2 and the liquid crystal display device 1 of the present embodiment are configured as described above, in FIG. 1, when the LED 25 is turned on, light from the LED 25 is guided from the light incident surface 19 b of the light guide 19. It is introduced into the body 19. When the introduced light exceeds a critical angle with respect to the light emitting surface 19a, the light is emitted from the light emitting surface 19a to the outside. The emitted light becomes planar light and illuminates the liquid crystal panel 3. The light supplied to the liquid crystal panel 3 is modulated for each pixel by the liquid crystal layer sandwiched between the first substrate 8 and the second substrate 9, and as a result, an image is displayed on the outer surface of the polarizing plate 11b. .

  Since the LED 25 is a power LED in this embodiment, it can emit light with high brightness. Therefore, the illumination device 2 can emit planar light with high luminance. The display by the liquid crystal panel 3 performed using the emitted light having high luminance can be clearly seen even when viewed in a bright environment. This is very advantageous for display in a car navigation device, for example.

  When the LED 25 is lit as described above, the LED 25 generates heat to a high temperature. If this heat generation is left unattended, the LED 25 is damaged and normal illumination processing cannot be performed. Therefore, in this embodiment, the heat radiation processing is performed as follows. That is, in FIG. 3, heat generated in the LED 25 is transmitted to the first case 16 via the LED substrate 24, and is radiated from the first case 16 to the outside. In addition, an internal space R is provided between the first case 16 and the second case 17, and the internal space R is connected to the external space through the openings 23a and 23b. As a result, the heat radiation from the first case 16 is performed very efficiently. As a result, the LED 25 is reliably cooled and protected from damage due to heat.

  In particular, in the present embodiment, air intake / exhaust is performed by the air inlet 23a provided on the side closer to the LED 25 and the air outlet 23b provided on the side far from the LED 25, so that a preferable convection is formed in the internal space R. Therefore, the LED 25 can be reliably cooled.

  The internal space R can be formed without necessarily using the second case 17. For example, the internal space R can also be formed by adhering the light guide 19 to the third case 18. However, if the second case 17 is used, the internal space R having a certain shape can be reliably formed in the liquid crystal display device 1.

  In the present embodiment, since the second case 17 is formed by molding using a synthetic resin as a material, the shape of the second case 17, and thus the shape of the internal space R, can be accurately set to any desired shape. If this shaping | molding process is employ | adopted, the screw hole 15 of FIG. 4 can be easily formed in a predetermined position. In the present embodiment, the second case 17 is preferably formed of a light-reflecting synthetic resin, such as a white synthetic resin. If the second case 17 has light reflectivity in this way, light leaking from the light guide 19 in FIG. 1 can be reflected toward the liquid crystal panel 3, so that the light can be used effectively.

  In the present embodiment, as shown in FIG. 1, an inverted wedge-shaped internal space R is formed by the first case 16 with respect to the wedge-shaped light guide 19, and as a result, the first case A portion of the light guide 19 facing the light guide 19 is parallel to the light exit surface 19 a of the light guide 19. This shape makes it very easy to handle the liquid crystal display device 1 when grasping the liquid crystal display device 1 by hand or attaching the liquid crystal display device 1 to an actual machine.

(Modification)
In the above-described embodiment, the first case 16 is provided with the protruding piece 28a protruding outward, but the protruding piece 28a may not be provided. By doing so, the outer surface of the first case 16 becomes a smooth flat surface without any undulations, so that it is possible to freely determine how to place any member around the lighting device 2.

  In the above embodiment, the two openings 23a and 23b are provided in the first case 16, but the number of openings may be one. This one opening can promote air circulation. Also, the number of openings can be three or more. The openings are not limited to a rectangular shape that is long horizontally, and short rectangular shapes, square shapes, and other polygonal openings may be appropriately distributed within the bottom surface of the first case 16.

(Second embodiment of illumination device and electro-optical device)
FIG. 5 shows another embodiment of the illumination device and the electro-optical device according to the present invention. This embodiment differs from the previous embodiment shown in FIG. 3 in that in addition to providing openings 23a and 23b in the bottom wall of the first case 16, another opening 23c is also provided in the side wall of the first case 16. It is provided. In this case, an opening is also formed in the corresponding part of the second case 17 and the third case 18.

  Thus, by providing the opening 23c also on the side wall of the first case 16, a more preferable air convection can be generated in the internal space R, and the heat dissipation effect by the first case 16 can be further enhanced. . It is also possible to eliminate the opening 23b in the bottom wall and provide the side wall opening 23c instead.

(Third embodiment of illumination device and electro-optical device)
FIG. 6 shows still another embodiment of the illumination device and the electro-optical device according to the present invention. This embodiment is different from the previous embodiment shown in FIGS. 3 and 5 in that the first case 16 is provided with a heat pipe 31 as heat transfer means. The heat pipe 31 is a known heat transfer element. For example, as shown in FIG. 7, the liquid medium 33 is enclosed in a tube container 32 and a reflux member 34 is provided on the inner wall surface of the tube container 32. .

  One end portion of the heat pipe 31 is a heat input portion Ni, and the other end portion is a heat output portion No. When the heat input portion Ni reaches a high temperature, the liquid medium 32 boils and evaporates at that portion, and the evaporation heat flows toward the heat output portion No, which is a low temperature, and is released to the outside at the heat output portion No. The liquid medium 32 that has released the heat is then returned to the heat input portion Ni by the action of the annular member 34.

  In the present embodiment, the heat pipe 31 is inserted into the internal space R through the opening 23b on the side far from the LED 25 in FIG. An end portion of the heat pipe 31 inserted into the internal space R is the heat input portion Ni, and an end portion in the external space is the heat output portion No. With this configuration, in addition to the heat dissipation action using the openings 23a and 23b and the internal space R, the heat dissipation action using the heat pipe 31 is performed. As a result, the first case 16 and thus the LED 25 can be cooled very efficiently. Can do.

  The heat input portion Ni of the heat pipe 31 may be disposed in the inner space R away from the wall inner surface of the first case 16, or may be brought into contact with the wall inner surface of the first case 16 in the inner space R. May be. Further, the shape of the tube container 32 of the heat pipe 31 is not limited to a simple rod-like tube shape as in the present embodiment, and may be any shape as necessary. For example, the heat input portion Ni may be flattened to increase the area. Further, the number of heat pipes 31 is not limited to one, and a plurality of heat pipes 31 may be used. Further, the heat pipe 31 does not necessarily have to be inserted into the internal space R through the opening 23b, and may be provided in contact with the outer surface of the bottom wall of the first case 16.

(Fourth embodiment of illumination device and electro-optical device)
FIG. 8 shows still another embodiment of the illumination device and the electro-optical device according to the present invention. In this embodiment, a modification is added to the first case 16 in the vicinity of the LED 25, that is, the portion indicated by the arrow B with respect to the previous embodiment shown in FIG. Specifically, in FIG. 8, the vicinity of the side wall of the first case 16 is processed to provide a cut and raised portion 35, and the tip of the second case 17 is received by the cut and raised portion 35. With this configuration, the second case 17 can always be stably disposed at a fixed position.

(Other embodiments of electro-optical device)
The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to the embodiments, and various modifications can be made within the scope of the invention described in the claims.
For example, the present invention relates to an electro-optical panel other than a liquid crystal panel, for example, an organic EL panel, an inorganic EL panel panel, a plasma display (PDP) panel, an electrophoretic display (EPD) panel, a field emission display ( It can also be formed using a FED (Field Emission Display) panel or the like.

(Embodiment of electronic device)
Hereinafter, an electronic device according to the present invention will be described with reference to embodiments. In addition, this embodiment shows an example of this invention and this invention is not limited to this embodiment.

  FIG. 9 shows an embodiment of an electronic apparatus according to the invention. The electronic apparatus shown here includes a liquid crystal display device 101 and a control circuit 100 that controls the liquid crystal display device 101. The control circuit 100 includes a display information output source 104, a display information processing circuit 105, a power supply circuit 106, and a timing generator 107. The liquid crystal display device 101 includes a liquid crystal panel 102 and a drive circuit 103.

  The display information output source 104 includes a memory such as a random access memory (RAM), a storage unit such as various disks, a tuning circuit that tunes and outputs a digital image signal, and various clock signals generated by the timing generator 107. Based on the above, display information such as an image signal in a predetermined format is supplied to the display information processing circuit 105.

  Next, the display information processing circuit 105 includes a number of well-known circuits such as an amplification / inversion circuit, a rotation circuit, a gamma correction circuit, a clamp circuit, and the like, executes processing of input display information, and outputs an image signal. It is supplied to the drive circuit 103 together with the clock signal CLK. Here, the drive circuit 103 is a generic term for an inspection circuit and the like together with a scanning line drive circuit and a data line drive circuit. The power supply circuit 106 supplies a predetermined power supply voltage to each of the above components.

  The liquid crystal display device 101 can be configured using, for example, the liquid crystal display device 1 shown in FIG. In the liquid crystal display device 1 of FIG. 1, the heat of the LED 25 that generates heat to a high temperature is efficiently radiated mainly using the first case 16 and the internal space R, thereby causing the LED 25 to emit light stably and with high brightness. As a result, bright display can be stably performed. Therefore, bright display can be stably performed in the electronic apparatus using the liquid crystal display device 1.

  FIG. 10 shows a car navigation apparatus as another embodiment of the electronic apparatus according to the invention. The car navigation device 110 includes a main body 111 that is mounted on, for example, a console box in a driver's seat of an automobile, and a display body 112 that extends from the main body 111 and extends upward. A display device 113 is provided inside the display body 112. The display device 113 can be configured using, for example, the liquid crystal display device 1 shown in FIG. In the liquid crystal display device 1 of FIG. 1, the heat of the LED 25 that generates heat to a high temperature is efficiently radiated mainly using the first case 16 and the internal space R, thereby causing the LED 25 to emit light stably and with high brightness. As a result, bright display can be stably performed. Therefore, even in the car navigation device 110 using the liquid crystal display device 1, bright display can be stably performed.

  FIG. 11 shows a mobile phone which is still another embodiment of the electronic apparatus according to the present invention. A cellular phone 120 shown here has a main body 121 and a display body 122 provided on the main body 121 so as to be opened and closed. A display device 123 configured by an electro-optical device such as a liquid crystal display device is disposed inside the display body portion 122, and various displays related to telephone communication can be visually recognized on the display body portion 122 on the display screen 124. Operation buttons 125 are arranged on the main body 121.

  An antenna 126 is attached to one end portion of the display body portion 122 so as to be stretchable. A speaker (not shown) is arranged inside the receiver 127 provided at the upper part of the display body 122. In addition, a microphone (not shown) is built in the transmitter 128 provided at the lower end of the main body 121. A control unit for controlling the operation of the display device 123 is stored in the main body unit 121 or the display body unit 122 as a part of the control unit that controls the entire mobile phone or separately from the control unit. The

  The display device 123 can be configured using, for example, the liquid crystal display device 1 shown in FIG. In the liquid crystal display device 1 of FIG. 1, the heat of the LED 25 that generates heat to a high temperature is efficiently radiated mainly using the first case 16 and the internal space R, thereby causing the LED 25 to emit light stably and with high brightness. As a result, bright display can be stably performed. Accordingly, bright display can be stably performed even in the cellular phone 120 using the liquid crystal display device 1.

(Modification)
In addition to the above-described mobile phones and the like as electronic devices, personal computers, liquid crystal televisions, viewfinder type or monitor direct view type video tape recorders, car navigation devices, pagers, electronic notebooks, calculators, word processors, Examples include workstations, video phones, and POS terminals.

It is sectional drawing which shows one Embodiment of the illuminating device and electro-optical apparatus which concern on this invention. FIG. 2 is an exploded cross-sectional view of the apparatus of FIG. FIG. 2 is a perspective view illustrating a main part of the apparatus of FIG. It is a partially broken perspective view which shows the state which removed the 1st case which is the uppermost components from the apparatus shown in FIG. FIG. 6 is a perspective view showing another embodiment of the illumination device and the electro-optical device according to the present invention, partially broken away. FIG. 14 is a perspective view showing still another embodiment of the illumination device and the electro-optical device according to the present invention in a partially broken view. It is sectional drawing which shows an example of the heat pipe used with the apparatus of FIG. It is sectional drawing which shows the principal part of further another embodiment of the illuminating device and electro-optical apparatus which concern on this invention. It is a block diagram which shows one Embodiment of the electronic device which concerns on this invention. It is a perspective view which shows the car navigation apparatus which is other embodiment of the electronic device which concerns on this invention. It is a perspective view which shows the mobile telephone which is other embodiment of the electronic device which concerns on this invention.

Explanation of symbols

1. 1. liquid crystal display device (electro-optical device), Lighting equipment,
3. 3. Liquid crystal panel (electro-optical panel) 4. a wiring board; FPC board,
8). First substrate, 9. Second substrate, 10. 1st translucent board | substrate, 11a, 11b. Polarizer,
12 12. a second translucent substrate; Driving IC, 15. Screw holes, 16. First case,
17. Second case, 18. Third case, 19. Light guide, 19a. Light exit surface,
19b. Light incident surface, 19c. Back, 20. 20. Optical sheet group Light reflection sheet,
22. Side walls, 23a, 23b, 23c. Opening, 24. LED substrate, 25. LED,
28a, 28b. Protrusion, 31. Heat pipe (heat transfer means), 32. Tube container,
33. Liquid medium, 34. Reflux member, 35. Cut-and-raised part,
101. Liquid crystal display device (electro-optical device), 102. LCD panel (electro-optical panel),
110. Car navigation apparatus (electronic device), 120. Mobile phones (electronic devices),
R. Interior space

Claims (13)

A light source that emits light;
A light emitting surface, a light incident surface that is a side surface adjacent to the light emitting surface, and a back surface that is a surface facing the light emitting surface, and the light emitted from the light source is introduced from the light incident surface. A light guide that emits from the light exit surface and the back surface is an inclined surface;
A first case provided in a state of contacting the light source and covering the back surface of the light guide, forming an internal space with the light guide, and having thermal conductivity;
The lighting device according to claim 1, wherein the first case has at least one opening that connects the internal space to the external space of the first case.   2. The lighting device according to claim 1, wherein the at least one opening includes an air inflow opening and an air outflow opening.   3. The lighting device according to claim 2, wherein the air inflow opening is provided at a position closer to the light source than the air outflow opening.   4. The lighting device according to claim 2, wherein the air outflow opening is provided on a side surface of the first case.   5. The lighting device according to claim 1, wherein a portion of the first case that faces the light guide is parallel to a light exit surface of the light guide. A lighting device.   6. The lighting device according to claim 1, further comprising a heat transfer means for transferring heat of the first case to another portion. 7.   7. The lighting device according to claim 6, wherein the heat transfer means is a heat pipe in which a liquid medium is accommodated in a container having a heat input portion and a heat dissipation portion, and the heat input portion of the heat pipe is the inner portion. An illuminating device, wherein the illuminating device is disposed in a space, and a heat radiating portion of the heat pipe is disposed outside the first case.   The lighting device according to any one of claims 1 to 7, further comprising a second case disposed between the light guide and the first case to support the light guide, The lighting device according to claim 1, wherein the internal space is formed between the second case and the first case.   9. The lighting device according to claim 8, wherein the second case is made of a synthetic resin having light reflectivity.   The lighting device according to claim 8 or 9, wherein the second case has at least one screw hole.   The lighting device according to any one of claims 1 to 10, further comprising a third case that supports an object to be illuminated and fits to a side portion of the first case. .   12. An electro-optical device comprising: an illumination device that emits light; and an electro-optical panel that receives the light emitted from the illumination device, wherein the illumination device is the illumination device according to claim 1. apparatus. An electronic apparatus comprising the electro-optical device according to claim 12.

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