JP5896217B2 - Display device - Google Patents

Description

  The present invention relates to a display device including a display element that displays predetermined information and a light source that supplies illumination light to the display element.

  Conventionally, as this type of display device, for example, the one described in Patent Document 1 below is known. The display device described in Patent Document 1 includes a display element that displays predetermined information, a backlight unit that backlight-illuminates the display element, and a case body that houses the display element and the backlight unit. The unit includes a plate-shaped light guide disposed behind the display element, a circuit board disposed to face one side of the plate-shaped light guide, and a light emitting surface thereof facing the one side. A light source (LED) mounted on the circuit board, a plate-shaped light guide, a resin case that accommodates the circuit board and the light source, and a heat dissipation member that can dissipate heat generated from the light source. .

  In this case, the heat dissipating member is inserted into the resin case through the flat portion disposed along the back surface of the resin case and the through hole provided in the resin case so as to contact the circuit board. The insertion portion is integrally formed.

  A plurality of openings are formed in the bottom wall portion of the case body corresponding to a part of the flat part of the heat radiating member, so that a part of the flat part of the heat radiating member is provided in the case body. It faces the plurality of openings. According to such a configuration, the heat generated from the light source when the light source is turned on passes through the circuit board, the insertion portion of the heat dissipation member, a part of the flat portion of the heat dissipation member, and the plurality of openings of the case body in the atmosphere. It has been dissipated.

JP 2011-113904 A

By the way, in the display apparatus of the above-mentioned patent document 1, it is the structure which a part of flat part in a heat radiating member faces the several opening part provided in the case body. As described above, when the heat dissipation area of the heat dissipation member is configured by only a part of the flat portion that is an area facing the opening provided in the case body, the contact area with the outside air (atmosphere) is one of the flat portions. Therefore, there is a problem that sufficient heat radiation efficiency cannot be obtained, and there is room for further improvement.
Therefore, the present invention aims to provide a display device capable of improving the heat dissipation efficiency in order to cope with the above-described problems.

  In the present invention, a display element having a display unit for displaying predetermined information, a light source for supplying illumination light to the display element, the display element and the light source are accommodated, and a display window unit is provided to correspond to the display unit. A display unit having a frame body made of a conductive material formed; a heat radiating member capable of dissipating heat generated from the light source through the frame body; and a case body containing the heat radiating member. The member has a first heat dissipation region that is a region facing the opening provided in the case body, and a second heat dissipation region that is a region not facing the opening, and the case body includes the first heat dissipation region. (2) A bent portion is provided so that a required portion of the heat radiation area is exposed to the outside air.

The present invention also includes a circuit board having a control means for operating the display element, wherein the display device comprises a vehicle instrument mounted on a vehicle, and the case body is located behind the circuit board. The bent portion having a substantially flat base portion and provided integrally with the base portion is formed of an inclined wall bent toward the circuit board side so as to form a predetermined angle with the base portion, and the bent portion The vehicle instrument is arranged on the instrument panel of the vehicle so that the direction in which the gravity is formed substantially coincides with the direction of gravity in which the gravity of the vehicle instrument acts.

  According to the present invention, a circuit board having a control means for operating the display element is provided on the rear side of the display unit so as to avoid the disposition position of the heat radiating member. And a partition wall extending toward the display unit so as to partition the circuit board and the circuit board.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus which can achieve an initial objective and can improve heat dissipation efficiency can be provided.

1 is a front view of a display device according to an embodiment of the present invention. AA sectional drawing of FIG. BB sectional drawing of FIG. CC sectional drawing of FIG. Sectional drawing which shows the state by which the display apparatus by the same embodiment was accommodated in the instrument panel of a vehicle.

  Hereinafter, a case where the display device of the present invention is applied to a vehicle instrument mounted on a vehicle will be described as an example with reference to FIGS.

  In FIG. 1, a vehicle meter D as a display device according to this embodiment includes a pointer-type display unit 10 including a speedometer that displays a vehicle speed, and a display that displays various vehicle information such as travel distance, fuel consumption, and time. A unit 20 is provided, and the pointer type display unit 10 and the display unit 20 are arranged side by side.

  As shown in FIG. 1 and FIG. 2, the pointer-type display unit 10 as a speedometer includes a pointer 11, a driving device 12 including an instrument movement for operating the pointer 11, and a circuit formed by electrically mounting the driving device 12. It is mainly comprised from the board | substrate 13, and the index board 14 which is located between the pointer | guide 11 and the circuit board 13, and has the index parts 14a, such as a scale and a numerical value which the pointer | guide 11 instruct | indicates, and is provided in the back side of the indicator board 14. A plurality of light emitting elements (LEDs) 15 corresponding to the pointer 11 and the indicator plate 14 are mounted on the circuit board 13 to be mounted.

  In this case, the pointer 11 is formed of a light-transmitting material that can receive and emit light when the light emitting element 15 is turned on, and the indicator portion 14a of the indicator plate 14 receives the irradiation light when the light emitting element 15 is turned on. It is made of a light transmissive material so as to emit light. It should be noted that a substantially rectangular opening for exposing a required portion of the display unit 20 (specifically, a display area of a display element described later provided in the display unit 20) is provided at 14 locations on the indicator plate corresponding to the display unit 20. A window 14b is formed.

  The circuit board 13 is made of, for example, a hard wiring board in which a wiring pattern (not shown) is provided on a glass epoxy base material. For example, the driving device 12, the light emitting element 15, the driving device 12, the light emitting element 15, and the display element. The control means 13a for operating the first connector 13b, and circuit components (not shown) such as a resistor and a capacitor are conductively connected to the wiring pattern.

  In this case, the circuit board 13 is provided on the back side of the pointer-type display unit 10 and the back side of the display unit 20 so as to avoid the disposition position of the heat radiating member described later (FIGS. 2 and 3). reference).

  A meter housing 16 made of, for example, white synthetic resin is provided on the front side of the circuit board 13. The meter housing 16 houses a light emitting element 15 and transmits the light to the pointer 11 and the indicator plate 14 side. A plurality of illumination chambers are formed for guiding. The instrument housing 16 has a function as a holding body for holding the indicator plate 14 and the display unit 20 (see FIGS. 2 and 3).

  A turning member 17 is arranged in front of the instrument housing 16, and the turning member 17 has a first window portion 17 a that exposes a visible region of the pointer-type display unit 10 (that is, the pointer 11 and the indicator portion 14 a). In order to expose the display area of the display element, a second window portion 17b having substantially the same opening shape as the opening window 14b is formed, and in front of the turning member 17, for example, a curved shape is formed. A transparent or translucent transparent panel 18 is disposed.

  Reference numeral 19 denotes a case body made of, for example, black light-shielding synthetic resin that accommodates the driving device 12, the circuit board 13, the indicator plate 14, the light emitting element 15, the instrument housing 16, the display unit 20, the heat dissipation member, and the like.

  The case body 19 is formed in a substantially bottomed cup shape, and has a substantially flat base 19 a located behind the circuit board 13 so as to be separated from the circuit board 13, and an indicator plate 14 from the periphery of the base 19. A side wall portion 19b having a standing wall shape extending toward the peripheral edge of the circuit board and a plurality of projections (not shown) for holding the circuit board 13 are integrally formed.

  As shown in FIG. 3, the display unit 20 includes a display element 21, a source line driving circuit (not shown) that drives a source line (signal line) of the display element 21, and a gate line (scanning line) of the display element 21. And a light source 22a, a light source 22b, a first flexible wiring board 22c, etc., and illumination means 22 for guiding illumination light to the display element 21, A frame made of a conductive material that constitutes an outer case of the display unit 20, which includes a resin case 23 made of a substantially flat white resin that holds the display element 21 and the light guide 22 a, a front frame 24, and a rear frame 25. And a timing controller (not shown) for generating various timing signals for controlling the timing of the body 26, the source line driving circuit, and the gate line driving circuit. And a printed circuit board 27.

  In this case, the frame body 26 composed of the front frame 24 and the rear frame 25 that forms a pair with the front frame 24 includes the display element 21, the light guide 22a, the light source 22b, the resin case 23, and the like. The printed circuit board 27 is housed and is fixed to the back surface of a second main body portion (described later) of the back frame 25 using a fixing means as appropriate.

  If necessary, one or more optical members (for example, a diffusion sheet or a prism sheet) for backlighting the display element 21 substantially uniformly may be disposed between the display element 21 and the light guide 22a. Good.

  The display element 21 includes, for example, a TFT-type liquid crystal display element having a plurality of pixels, and displays vehicle information (predetermined information) such as travel distance and fuel consumption based on detection signals from various sensors mounted on the vehicle. The display unit 21a is provided (see FIG. 1). The display unit 21 is displayed in a display area (not shown) of the display element 21.

  The light guide 22 a is made of a substantially flat transparent translucent synthetic resin, and is disposed along the back surface of the display element 21. In other words, the light guide 22a is disposed in the illumination optical path from the light source 22b to the display element 21.

  The light sources 22b are formed of chip-type light emitting diodes that emit colors as appropriate. In FIG. 3, a plurality of light sources 22b are arranged in a line along one side surface 22d located above the light guide 22a, and illuminate the display elements 21 with illumination light. It consists of the luminous body to supply.

  The front frame 24 is made of a conductive material, is press-molded into a substantially frame shape, and is formed so as to hang downward from the periphery of the first main body portion 24a. The first peripheral wall portion 24b is integrally formed. A display window portion 24c formed of a substantially rectangular opening window is formed at a substantially central portion of the first main body portion 24a so as to correspond to the display portion 21a.

  Similar to the front frame 24, the back frame 25 is made of a conductive material and is formed in a substantially concave shape in cross section. The second frame 25a that forms the main part of the back frame 25 and the periphery of the second frame 25a The first peripheral wall portion 25b is formed integrally with a second peripheral wall portion 25b that protrudes toward the peripheral wall portion 24b.

  And in FIG. 3, the 1st flexible wiring board 22c is suitably fixed to the inner wall surface 25c of the 2nd surrounding wall part 25b located upward using a fixing means, and each light source 22b is the light guide 22a. It is mounted on a conductive path (not shown) provided in the first flexible wiring board 22c so as to face the one side surface 22d.

  In FIG. 3, reference numeral 27a denotes a second connector mounted on the printed circuit board 27. The second connector 27a and the first connector 13b mounted on the circuit board 13 are the second flexible wiring board. Conductive connection is established by F.

  In FIG. 3, a heat radiating member 30, which is a heat sink, is disposed on the upper side of the circuit board 13 so as to face the opening 19 c provided in the case body 19.

  In this case, the heat radiating member 30 is made of a metal material having high thermal conductivity such as aluminum, and is fixed to the bottom surface on the upper end side of the second main body portion 25a in FIG. A large number of radiating fins 31 that can contact outside air (atmosphere) outside the case body 19 are provided on the tip side (see FIG. 4). In addition, you may interpose the heat conductive sheet (not shown) which is a heat conductive member between the 2nd main-body part 25a and the thermal radiation member 30 as needed.

  Moreover, the heat radiating member 30 is installed behind each light source 22b, and the heat | fever emitted from each light source 22b at the time of lighting of each light source 22b can be thermally radiated through the back frame 25 (frame body 26). Specifically, the heat generated from each light source 22b is generated by the first flexible wiring board 22c, the second peripheral wall portion 25b located above in FIG. 3, the upper end side of the second main body portion 25a, and the heat radiating member. 30 (radiating fins 31) are sequentially reached, and then diffused to the outside of the case body 19 (opening 19c).

  By the way, in this example, the front-end | tip part of the radiation fin 31 which is an area | region facing the opening part 19c of the case body 19 is defined as the 1st thermal radiation area | region H1 with which the thermal radiation member 30 is equipped, On the other hand, the opening part of the case body 19 A portion of the heat dissipating fin 31 (heat dissipating member 30) that is a region not facing 19c is defined as a second heat dissipating region H2 provided in the heat dissipating member 30.

  In the case of this example, the distal end portion of the radiating fin 31 is positioned substantially on the same plane as the bottom surface of the base portion 19a of the case body 19. For example, the distal end portion of the radiating fin 31 is protruded from the bottom surface of the base portion 19a. May be.

  In FIG. 3, reference numeral 19d denotes a bent portion provided integrally with the substantially flat base 19 at the base 19a in the vicinity of the opening 19c. The bent portion 19d is connected to the base 19a. It consists of an inclined wall bent toward the circuit board 13 so as to form a predetermined angle.

  In this way, by providing the bent portion 19d that is bent toward the circuit board 13 at the base portion 19a located in the vicinity of the opening portion 19c, the heat generated from each light source 22b passes through the heat dissipation member 30. It is dissipated into the atmosphere from the opening 19c part facing the first heat radiation area H1, and at the same time, it is dissipated from the part (required part) of the second heat radiation area H2 facing the bent part 19d to the atmosphere. It becomes the composition which becomes.

  Therefore, by providing the case body 19 (base portion 19a) with a bent portion 19d made of an inclined wall so that a part (required portion) of the second heat radiation region H2 is exposed to the outside air, the bent portion is compared with the conventional case. Due to the increase in the area where the outside air comes into contact with the heat radiating member 30 by the amount provided by 19d, the heat generated by each light source 22b is efficiently dissipated into the atmosphere through the heat radiating member 30 to improve the heat radiating efficiency. Can do.

  In addition, it extends to the display unit 20 side so as to partition (partition) the heat dissipation member 30 and the circuit board 13 on the distal end side of the bent part 19d located on the circuit board 13 side opposite to the base part 19a side. A partition wall 19e is formed to extend, and this partition wall 19e has a function as a heat shielding wall that suppresses heat transfer from the heat radiating member 30 side to the circuit board 13 side.

  Accordingly, for example, the heat dissipated from the second heat radiation region H2 located on the bent portion 19d side is not easily transmitted to the circuit component mounted on the circuit board 13 by the partition wall 19e. Can be prevented from malfunctioning. Further, the provision of the partition wall 19e has an advantage that dust and the like can be prevented from entering the case body 19.

  In FIG. 4, reference numeral 19 f denotes a plurality of slits provided at the side wall portion 19 b of the case body 19 adjacent to the heat radiating member 30, and these slits 19 f communicate with the non-formation region of the heat radiating fins 31. Is provided.

  A vehicle meter D is configured by the above-described units. FIG. 5 shows a state in which the vehicle meter D is stored in a storage portion 41 provided in the instrument panel 40 of the vehicle. Here, the vehicle instrument D is connected to the instrument panel 40 so that the gravity direction G in which the gravity of the vehicle instrument D acts and the direction in which the bent portion 19d provided in the case body 19 is formed substantially coincide with each other. It is set as the structure arrange | positioned by inclination in the (storage part 41).

  According to such a configuration, since the bent portion 19d is formed along the gravity direction G, the heat transmitted from each light source 22b to the heat radiating member 30 when each light source 22b is turned on is bent 19d. The air (outside air) is efficiently dissipated using the air (outside air) air passage from the side toward the slit 19f located above the bent portion 19d.

  That is, the air which goes to the slit 19f side located above the bending part 19d from the bending part 19d side rises along the bending part 19d, and the non-formation area | region of the radiation fin 31 and the radiation fin 31 after that Is raised through a plurality of slits 19f provided so as to communicate with the vehicle, and finally dissipated to the outside of the case body 19 (vehicle instrument D). Device).

  Note that the side wall portion 19b itself located in the vicinity of the heat radiating member 30 may be eliminated without providing the slit 19f in the side wall portion 19b located in the vicinity of the heat radiating member 30. In this case, the air from the bent portion 19d toward the upper side of the bent portion 19d rises along the bent portion 19d, and then passes through the radiation fin 31 to the outside of the vehicle instrument D. Since it is dissipated, the vehicle instrument D (display device) with good heat dissipation can be provided.

  As described above, in the present embodiment, the display element 21 including the display unit 21a that displays predetermined information, the light source 22b that supplies illumination light to the display element 21, the display element 21, and the light source 22b are housed and the display unit 21a. The display unit 20 having the front frame 24 (frame body 26) made of a conductive material with the display window 24c formed so as to correspond to the above, and heat dissipation that enables heat generated from the light source 22b to be radiated through the frame body 26 The member 30 and a case body 19 that accommodates the heat radiating member 30 are provided. The heat radiating member 30 includes a first heat radiating area H1 that is an area facing the opening 19c provided in the case body 19, and an opening 19c. The case body 19 has a second heat radiating region H2 that is not opposed, and the case body 19 has a bent portion so that a part (required portion) of the second heat radiating region H2 is exposed to the outside air. By providing 9d, the heat generated by each light source 22b is generated by the heat dissipation member 30 because the area where the outside air contacts the heat dissipation member 30 is increased by the amount of the bent portion 19d compared to the conventional case. It is efficiently dissipated into the atmosphere through and heat dissipation efficiency can be improved.

  Further, in the present embodiment, the display device includes the vehicle instrument D mounted on the vehicle, and the direction in which the bent portion 19d is formed and the gravity direction G in which the gravity of the vehicle instrument D acts substantially coincide. In addition, since the vehicle instrument D is arranged in the instrument panel 40 (inside the storage portion 41) of the vehicle, the air traveling from the bent portion 19d side to the upper side of the bent portion 19d becomes the bent portion 19d. , And then dissipates to the outside of the vehicle meter D through the heat dissipating fins 31, so that a display device with good heat dissipation can be provided.

  Further, in the present embodiment, the circuit board 13 having the control means 13a for operating the display element 21 is provided on the back side of the display unit 20 so as to avoid the disposition position of the heat dissipation member 30, and the bent portion 19d includes Since the partition wall 19e extending toward the display unit 20 is extended so as to partition the heat dissipation member 30 and the circuit board 13, the heat dissipated from the second heat dissipation region H2 located on the bent portion 19d side is Since the partition wall 19e is difficult to be transmitted to the circuit component mounted on the circuit board 13, malfunction of the circuit component can be prevented.

  Further, in the present embodiment, the example in which the bent portion 19d is formed of an inclined wall for exposing the required portion of the second heat dissipation area H2 to the outside air has been described. However, for example, the required portion of the second heat dissipation area H2 should be exposed to the outside air. The bent portion 19d may be formed by a plurality of inclined walls having different inclination angles, or the bent portion 19d made of a curved wall that exposes a required portion of the second heat radiation area H2 to the outside air may be formed. Alternatively, the shape of the bent portion 19d may be a shape in which the plurality of inclined walls having the different inclination angles and the curved wall described above are mixed in order to expose the required portion of the second heat radiation area H2 to the outside air. .

D Vehicle instrument (display device)
DESCRIPTION OF SYMBOLS 10 Pointer type display part 13 Circuit board 13a Control means 19 Case body 19a Base part 19b Side wall part 19c Opening part 19d Bending part 19e Partition wall 19f Slit 20 Display unit 21 Display element 21a Display part 22 Illumination means 22a Light guide 22b Light source 22c 1st flexible wiring board 23 Resin case 24 Front frame 24c Display window part 25 Back frame 26 Frame body 30 Heat radiation member 31 Heat radiation fin 40 Instrument panel 41 Storage part G Gravitational direction H1 1st heat radiation area H2 2nd heat radiation area

Claims (3)

A display element having a display unit for displaying predetermined information, a light source for supplying illumination light to the display element, a conductive element in which the display element and the light source are accommodated and a display window is formed so as to correspond to the display unit A display unit having a frame body made of a conductive material;
A heat dissipating member capable of dissipating heat generated from the light source through the frame body;
A case body that houses the heat dissipation member,
The heat dissipating member has a first heat dissipating region that is a region facing an opening provided in the case body, and a second heat dissipating region that is a region not facing the opening.
The display device, wherein the case body is provided with a bent portion so that a required portion of the second heat radiation area is exposed to the outside air. A circuit board having control means for operating the display element;
The display device comprises a vehicle instrument mounted on a vehicle,
The case body has a substantially flat base located on the back side of the circuit board,
The bent portion provided integrally with the base portion is composed of an inclined wall bent toward the circuit board so as to form a predetermined angle with the base portion,
The vehicle instrument is arranged on an instrument panel of the vehicle so that a direction in which the bent portion is formed and a gravity direction in which the gravity of the vehicle instrument acts substantially coincide. The display device according to claim 1. A circuit board having a control means for operating the display element is provided on the back side of the display unit so as to avoid the disposition position of the heat dissipation member,
The display device according to claim 1, wherein a partition wall extending toward the display unit is extended to the bent portion so as to partition the heat radiating member and the circuit board.

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