JP2009237218A - Liquid crystal display and display for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display obtaining a high heat dissipation property even in a thin structure and having an excellent electromagnetic shielding property, and also to provide a display for a vehicle, which uses the liquid crystal display. <P>SOLUTION: The liquid crystal display includes a light guide plate 8, LEDs 13a arranged oppositely to side edges of the light guide plate 8 and metallic substrates 13, each of which mounts the LED 13a on its one surface, to emit light from the LEDs 13a from the light guide plate 8 to one surface of liquid crystal displays 2 to 12. The liquid crystal display further includes: heat radiators 14, 15, 18, 19 which are attached to the other surfaces of the metallic substrates 13 and arranged on the side faces of the liquid crystal displays 2 to 12; and a shield case including a first shield member 1 arranged in the front of the liquid crystal displays 2 to 12 and a second shield member 10 and a third shield member 17 arranged so as to sandwich a controlling circuit board 16 arranged on the back of the liquid crystal displays 2 to 12, wherein, the third shield member 17 is brought into contact with the heat radiators 14, 15, 18, 19 so as to act also as a heat dissipation member. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device and a vehicle display device using the liquid crystal display device.

  In recent years, a vehicle display device using a liquid crystal display device that graphically displays a dial, a pointer, and the like on a TFT-type LCD (liquid crystal display) display has been introduced (for example, see Patent Document 1). .

In such a vehicle display device, an LED (light emitting diode) is disposed as a light emitting element facing the side edge of the light guide plate of the liquid crystal display device, and light incident on the side edge of the light guide plate from the LED is transmitted to the surface of the light guide plate. As the backlight, an illuminating device that emits light to the LCD is provided, and when an LED is used as the light emitting element, the heat generation amount is large, and thus a heat radiating device is provided (see Patent Document 2, for example).
JP 2006-13951 A JP 2004-279262 A

  The above-described vehicle display device is generally provided with a heat radiating plate such as a heat radiating fin on the back side of the LCD. However, with such a structure, the entire depth of the vehicle display device including the heat radiating device becomes long. Since the heat radiating device is also a heat generating part, it is necessary to widen the rear space. Further, since the TFT type LCD is driven at a high speed, there is a problem that noise is generated.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a liquid crystal display device having a thin structure and good heat dissipation and excellent electromagnetic shielding properties, and a vehicle display device using the liquid crystal display device. It is said.

  The liquid crystal display device according to claim 1, which has been made in order to solve the above-described problems, includes a light guide plate 8, an LED 13 a disposed to face a side edge of the light guide plate 8, and the LED 13 a on one surface. And a light-incident light incident on a side edge of the light guide plate 8 from the LED 13a as illumination light to one surface of the rectangular liquid crystal displays 2 to 12 A liquid crystal display device to be mounted on the other surface of the metal substrate 13 and disposed on the side surfaces of the liquid crystal display devices 2 to 12, and the liquid crystal display device. The second shield member 10 and the third shield member 10 disposed so as to sandwich the first shield member 1 disposed on the front surfaces 2 to 12 and the control circuit board 16 disposed behind the liquid crystal displays 2 to 12. Shield Shield cases 1, 10, 17 including a material 17, wherein the third shield member 17 contacts the heat radiating devices 14, 15, 18, 19 and also acts as a heat radiating member. And.

  In order to solve the above-mentioned problem, the invention according to claim 2 is the liquid crystal display device according to claim 1, wherein the heat dissipating device is interposed on the other surface of the metal substrate 13 with heat conductive sheets 18 and 19. The heat radiating plates 14 and 15 are provided, and the heat radiating plates 14 and 15 are provided with heat radiating fins.

  The vehicle display device according to claim 3, which has been made to solve the above problem, is provided with a display 51 having a display area on which various information indicating the state of the vehicle is displayed, and provided in front of the display 51. A display partition member 54 for partitioning the display area, and a moving mechanism for moving the display partition member 54, the moving mechanism supporting the display partition member 54 and extending to the back side of the display. A vehicle display device having a member 68 and a drive source 69 for driving the movable member 68, wherein the liquid crystal display device according to claim 1 or 2 is used as the display 51.

  The reference numerals in the description of the means for solving the above-described problems correspond to the reference numerals in the following description of the best mode for carrying out the invention, but these are the interpretations of the claims. It is not intended to limit.

  According to the liquid crystal display device of the first and second aspects of the present invention, since the heat dissipating device having a thin heat dissipating plate in the front-rear direction is arranged on the side portion of the liquid crystal display device, it has a thin structure and good heat dissipation. . Moreover, since the shield cases are provided before and after the liquid crystal display, the electromagnetic shielding properties are excellent.

  According to the vehicle display device of the third aspect of the present invention, when there is a moving member on the front side of the liquid crystal display screen and a movable member for moving a moving object on the rear side, By using the liquid crystal display device described above, a vehicle display device having a thin structure can be realized without increasing the depth.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a perspective view, and FIGS. 3A, 3B, and 3C are a plan view, a front view, and FIG. It is a right view.

  The liquid crystal display device includes an upper shield case 1, a TFT type LCD cell 2, an upper case 3, a first prism sheet 4, a second prism sheet 5, a third prism sheet 6, a diffusion sheet 7, a light guide plate 8, a reflection sheet 9, The intermediate shield plate 10, the spring 11, the lower case 12, the LED board 13, the heat radiating plate 14, the heat radiating plate 15, the control board 16, the lower shield case 17, the heat conductive sheet 18 and the heat conductive sheet 19 are configured.

  The first prism sheet 4, the second prism sheet 5, the third prism sheet 6, the diffusion sheet 7, the light guide plate 8, and the reflection sheet 9 are sequentially stacked and disposed between the upper case 3 and the lower case 12 made of resin. The optical structure is accommodated. The first prism sheet 4 is, for example, a DBEF (Dual Rightness Enhancement Film) sheet manufactured by Sumitomo 3M, and the second prism sheet 5 and the third prism sheet 6 are BEF sheets. A metal intermediate shield plate 10 is inserted between the reflection sheet 9 and the lower case 12.

  The TFT type LCD cell 2, the optical structure, and the control substrate 16 are laminated in order, and are accommodated between the metal upper shield case 1 and the metal lower shield case 17, so that a rectangular parallelepiped TFT type is obtained. Configure the liquid crystal display.

  The LED substrate 13 is a metal substrate such as rectangular aluminum having a size matched to the side edge 8a of the light guide plate 8. An LED circuit is formed on an insulating film formed thereon, and a plurality of LED substrates are formed. The LED 13 a is mounted so as to face the side edge 8 a of the light guide plate 8.

  The heat radiating plate 14 and the heat conductive sheet 18, and the heat radiating plate 15 and the heat conductive sheet 19 respectively constitute a heat radiating device. The heat radiating plates 14 and 15 are respectively rectangular mounting portions 14a and 15a for mounting on the LED substrate 13, L-shaped members 14b and 15b integrally formed with the mounting portions 14a and 15a, and a plurality of heat radiating fins 14c and 15c.

  The LED board 13 is fixed to the heat radiating plates 14 and 15 by screwing with screws 22 via the heat conductive sheets 18 and 19. The heat sinks 14 and 15 to which the LED substrate 13 is attached are fixed to the lower case 12 by screws with screws 20 and 21. The plurality of heat radiation fins 14c and 15c are arranged so as to extend rearward from the substantially same plane as the back surface of the lower shield case 17 slightly longer than the thickness of the liquid crystal display and parallel to the vertical direction. As the distance from the liquid crystal display device increases, the dimension in the vertical direction gradually decreases.

  The lower shield case 17 acts together with the upper shield case 1 and the intermediate shield plate 10 to ensure good electromagnetic shielding properties of the TFT LCD cell 2 and the control substrate 16, and is also a heat sink fixed to the lower case. It contacts with 14 and 15 and also acts as a heat radiating member, which is useful for enhancing the heat radiating effect.

  With such a structure, the liquid crystal display device according to the present embodiment has a heat dissipation device with a thin configuration because of the configuration in which a heat dissipation device having a thin heat dissipation plate in the front-rear direction is disposed on the side of the liquid crystal display. Moreover, since the shield cases are provided before and after the liquid crystal display, the electromagnetic shielding properties are excellent.

  Further, in the L-shaped members 14b and 15b of the heat radiating plates 14 and 15, there is a space between the surface opposite to the surface where the heat radiating fins 14c and 15c are provided and the same plane as the screen of the liquid crystal display. Using this space, other things that require heat dissipation may be arranged.

  Next, a vehicle display device in which the liquid crystal display device of the present invention is used will be described.

  4, 5, and 6 are a front view, a perspective view showing an internal structure, and a left side view, respectively, of the vehicle display device. In the vehicle display device, a full graphic meter 50 is arranged in the center of the front surface thereof. Further, warning display portions 91 and 92 are arranged on the left and right sides of the full graphic meter 50, respectively.

  The full graphic meter 50 includes a liquid crystal display 51 as a display, a turning plate 52 that covers a part of the display screen of the liquid crystal display 51, and a display partition mechanism 53 that is disposed in front of the liquid crystal display 51 and the turning plate 52. Including. The liquid crystal display 51 has a rectangular display screen as shown by a two-dot chain line in FIG. 5, but a part of the display screen is covered with a facing plate 52 having an approximately oval opening, It can be seen as an oval screen. Various information indicating the running state of the vehicle can be displayed on the display screen of the liquid crystal display 51.

  A display partition mechanism 53 is disposed at substantially the center of the substantially oval display screen. The display partition mechanism 53 includes a substantially ring-shaped display partition member 54 made of an opaque synthetic resin having a circular opening at the center, and a magnifying lens 55 fitted in the opening. The magnifying lens 55 may have any shape such as a convex shape or a concave shape, but here a convex lens is used. The ring-shaped display partition member 54 is provided with a plurality of (for example, twelve) light emitting portions 81a to 81l at predetermined intervals (for example, equal intervals).

  A liquid crystal display surrounded by the opening of the ring-shaped display partition member 54 as a first display area which is a part of the entire display area on the display screen of the liquid crystal display 51 except the area hidden by the facing plate 52 In the display area of the device 51, a display design 56 corresponding to a substantially circular dial indicating the measured amount of the running state of the vehicle is displayed. The display design 56 is a tachometer for instructing the engine speed as the first vehicle-related information, and a tachometer scale is displayed near the outer periphery thereof. In addition, a pointer 57 that rotates in accordance with the actual measured amount of engine speed when the engine is started and indicates the tachometer scale is also displayed. The display of the display design 56 and the pointer 57 constitutes an analog indicating instrument.

  The tachometer scale displayed near the outer periphery of the display design 56 includes a numeric scale of 0 to 10 and a line scale provided between the numeric scales. The numerical scales each represent a rotational speed of x1000 rpm, for example, the numerical scale “1” represents 1000 rpm, and the numerical scale “8” represents 8000 rpm. Further, the background color between the number scale “7” and the number scale “8” is different from the background color from the number scale “0” to the number scale “7”, and is red indicating the red zone of the engine speed. It is displayed.

  The light emitting portions 81a to 81l provided at predetermined intervals (for example, equal intervals) on the ring-shaped display partition member 54 are aligned with the positions of the numbers on the number scales 0 to 10 of the display design 56. It serves as a scale corresponding to. The light emitting portions 81c to 81i located at the positions corresponding to the numerical scales “0” to “6” emit white light, and the light emitting portions 81j located at the positions corresponding to the numerical scales “7” and “8” indicating the red zone. 81k emits light in red, and the light-emitting portions 81a, 81b, 81l located at positions where there are no numerical scales are turned off. That is, the light emitting units 81j and 81k are different in light emitting form from the other light emitting units so that the light emitting units 81j and 81k emit light in a different color from the other light emitting units.

  Near the center of the display design 56, a sub display area 58 for displaying information other than the tachometer is provided. The sub display area 58 includes, for example, a speedometer display area 59 that displays a speedometer that digitally displays the travel speed of the vehicle, and an od / tripmeter display area that displays an odometer / tripmeter that digitally displays the travel distance of the vehicle. 61 is provided.

  On the display screen of the liquid crystal display 51 surrounded by the outer periphery on the left side of the ring-shaped display partition member 54 and the facing plate 52, for example, a hydraulic gauge display area 62 for displaying a hydraulic gauge instructing the oil pressure of the engine oil, An oil temperature gauge display region 63 for displaying an oil temperature gauge that indicates the oil temperature of the engine oil is provided.

  Further, on the display screen of the liquid crystal display 51 surrounded by the outer periphery on the right side of the ring-shaped display partition member 54 and the facing plate 52, for example, a fuel gauge display for displaying a fuel gauge for instructing the remaining amount of fuel such as gasoline. A region 64 and a water temperature meter display region 65 for displaying a water temperature meter that indicates the temperature of the cooling water are provided.

  Further, the vehicle display device 1 is configured such that the display partition mechanism 53 can be moved by the moving mechanism 67 in the long axis direction of the substantially oval display screen of the liquid crystal display 51. The moving mechanism 67 has both ends on the back side of the facing plate 52 and the upper and lower portions of the liquid crystal display 51 and the upper and lower portions of the back surface of the ring-shaped display partition member 54 are joined. The frame 68 as a movable member that is bent and extended to the frame 68, the motor 69 as a drive source disposed on the back surface of the substrate 83 to which the liquid crystal display 51 is attached, and the driving force of the motor 69 to the frame 68 A transmission device 70 for communicating. Further, the moving mechanism 67 is parallel to the first support portion 71 that supports a part of the frame body 68 in the upper part of the liquid crystal display 51 and the major axis direction of the oval display screen on the housing of the vehicle display device 1. A shaft 72 in which the first support 71 is slidably fitted so as to be slidable, and a rail member 73 arranged in parallel to the major axis direction of the oval display screen on the back surface side of the substrate 83; The second support portion 74 is also included, which is fixed to the frame body 68 and has a guide groove that guides the rail member 73.

  The transmission device 70 includes a gear 70a fixed to the rotation shaft of the motor 69, a gear 70b meshing with the gear 70a, a pinion gear 70d to which the rotation of the gear 70b is transmitted by a belt 70c, and a frame body 68 fixed to the pinion gear. A rack 70e that converts the rotational motion of 70d into a linear motion parallel to the major axis direction.

  In the vehicle display device shown in FIGS. 4 and 5, the movable member such as the frame body 68 for moving the display partition member 54 is on the back side of the liquid crystal display 51, so that the backlight of the liquid crystal display 51 is illuminated. If a device including an LED and a heat dissipation device is to be adopted as the device, it is difficult to dispose the heat dissipation device on the back side of the liquid crystal display 51 as in the prior art. In addition, if forcibly adopted, the heat dissipating device must be disposed further rearward of the movable member, resulting in a problem that the depth of the vehicle surface display device becomes large and the entire device becomes large.

  Therefore, in such a vehicle display device, the liquid crystal display device shown in FIGS. In this case, the heat radiating plates 14 and 15 are located behind the warning display portions 91 and 92 not on the side of the liquid crystal display 51 but on the side, so that the movable members are not obstructed and the depth is increased. I will not let you.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation and application are possible.

  For example, in the above-described embodiment, the radiating fins 14c and 15c in the radiating plates 14 and 15 are arranged so as to extend rearward from the substantially same plane as the back surface of the lower shield case 17 slightly longer than the thickness of the liquid crystal display. However, as another embodiment, the heat dissipating fins 14c and 15c may be provided on the surface of the L-shaped members 14b and 15b on the liquid crystal display screen side so as to extend forward approximately the same as the thickness of the liquid crystal display. good.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention. 1 is a perspective view showing a liquid crystal display device according to an embodiment of the present invention. (A), (B), and (C) are respectively a plan view, a front view, and a right side view showing a liquid crystal display device according to an embodiment of the present invention. It is a front view of the display apparatus for vehicles in which the liquid crystal display device of the present invention is used. It is a perspective view which shows the internal structure of the display apparatus for vehicles. It is a left view of the display apparatus for vehicles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper shield case 2 TFT type LCD cell 3 Upper case 4 1st prism sheet 5 2nd prism sheet 6 3rd prism sheet 7 Diffusion sheet 8 Light guide plate 9 Reflective sheet 10 Intermediate shield plate (second shield member)
12 Lower case 13 LED substrate (metal substrate)
14 heat sink 15 heat sink 16 control board (control circuit board)
17 Lower shield case (third shield member)
18 heat conduction sheet 19 heat conduction sheet 51 display 54 display partition member 68 frame (movable member)
69 Motor (drive source)

Claims (3)

A light guide plate, an LED disposed opposite to the side edge of the light guide plate, and a metal substrate on which the LED is mounted on one surface, and light incident on the side edge of the light guide plate from the LED A liquid crystal display device for emitting light from the surface of the light guide plate as illumination light to one surface of a cuboid liquid crystal display,
A radiator plate attached to the other surface of the metal substrate and disposed on a side surface of the liquid crystal display;
A first shield member disposed in front of the liquid crystal display, and a second shield member and a third shield member disposed so as to sandwich a control circuit board disposed behind the liquid crystal display. A shield case that includes the shield case, wherein the third shield member is in contact with the heat dissipation device and also acts as a heat dissipation member;
A liquid crystal display device comprising: The liquid crystal display device according to claim 1.
The heat radiating device includes a heat radiating plate attached to the other surface of the metal substrate via a heat conductive sheet, and the heat radiating plate includes heat radiating fins. A display provided with a display area on which various information indicating the state of the vehicle is displayed; a display partition member provided on the front surface of the display for partitioning the display area; and a moving mechanism for moving the display partition member 54 The moving mechanism is a vehicle display device having a movable member that supports the display partition member and extends to the back side of the display, and a drive source that drives the movable member,
A liquid crystal display device according to claim 1 or 2 as the display.

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