JP2006227076A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for reducing a body size by reducing the restrictions of a light source element substrate and a circuit board. <P>SOLUTION: The display device is provided with a conductive member 7 on the surface of the circuit board 4 functioning as a fixed board, and fixes the light source element board 6 to the circuit board 4, by inserting the light source element board 6 in the conductive member 7. By making the display device into such a structure, the conductive member 7 is arranged at an arbitrary position of the circuit board 4; and since the circuit board 4 can be arranged in that location, restrictions with the end faces of the circuit board 4 and the conductive member 7 being required to be arranged proximately is eliminated in the case of the conventional type. Accordingly; the body of the display device can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device having a light source element substrate provided with a light source element and a circuit board on which a circuit unit including electronic components used for displaying various information on a display board is formed. It is.

  Conventionally, it has a light source element substrate provided with a light source element and a drive circuit for driving the light source element, and a circuit board on which a circuit portion including electronic parts used for displaying various information on a display board is formed. There is a display device. In such a display device, for example, since the on / off control of the switching element in the drive circuit provided in the light source element substrate is performed by the circuit in the circuit substrate, the light source element substrate and the circuit board are arranged in the vicinity, These specific locations are configured to be connected via a harness or the like.

FIG. 10 is a cross-sectional view showing a fixing structure between the light source element substrate J2 and the circuit board J3 provided with the light source element J1 in the conventional display device. As shown in this figure, using a holding member J4 bent at a right angle, a light source element substrate J2 is fixed to one side of the holding member J4, and a circuit board J3 is attached to the other side perpendicular to the one side. It has a fixed structure. Then, the end face of the light source element substrate J2 and the end face of the circuit board J3 are brought close to the corner portion (bent portion) J5 of the holding member J4, and these specific portions are connected by the harness J6 (see, for example, Patent Document 1). ).
Japanese Patent Laid-Open No. 2004-291949

  However, in the conventional structure, since the holding member bent at a right angle is used to fix the light source element substrate and the circuit board, the end face of the light source element board and the end face of the circuit board are formed at the corners of the holding member. Had to be close. In addition, electrical connection between the optical element substrate and the circuit board has to be made through a harness. For this reason, there is a limitation in the arrangement of each substrate, such as the arrangement that the light source element substrate and the circuit board are combined with each other, and as a result, there is a problem that the size of the display device becomes large. .

  In view of the above points, an object of the present invention is to provide a display device that can reduce the restrictions on the arrangement of a light source element substrate and a circuit board and can reduce the physique.

  In order to achieve the above object, according to the first aspect of the present invention, a display plate (1) for displaying, a light guide plate (2) for guiding light toward the back side of the display plate (1), and light generation Circuit board (4) provided with a light source element (5) to be operated, a light source element substrate (6) to which the light source element (5) is assembled, and an electronic component (4a) for performing display on the display panel (1) ), Wherein one of the light source element substrate (6) and the circuit board (4) is a fixing substrate and the other is a fixing substrate, and the fixing substrate is sandwiched between the fixing substrates. The clip-shaped conductive member (7) is provided, and the fixed substrate is fixed to the fixing substrate by inserting the clamped substrate into the conductive member (7) and sandwiching it. It is characterized by that.

  In this way, if one of the light source element substrate (6) and the circuit board (4) is a fixing substrate and the other is a fixing substrate, the fixing substrate is fixed to the fixing substrate. The conducting member (7) can be arranged at any place on the fixing substrate. For this reason, the arrangement of the light source element substrate (6) and the circuit board (4) is limited as compared with the conventional case where the holding member is used and the fixing substrate and the fixed substrate are fixed to the holding member. Can be reduced. This makes it possible to reduce the size of the display device.

  In the invention described in claim 2, the fixing substrate is formed with slits (4c) penetrating the front and back surfaces of the fixing substrate, and corresponds to the slits (4c) on the back surface of the fixing substrate. The conducting member (7) is disposed at the position, and the substrate to be fixed is inserted into the slit (4c) from the front surface side of the fixing substrate, and is sandwiched by the conducting member (7) on the back surface side of the fixing substrate. It is characterized by.

  As described above, the slit (4c) is provided in the fixing substrate, and the substrate to be fixed is inserted into the slit (4c) so that the conductive substrate (7) sandwiches the back surface of the fixing substrate. Is possible. With such a structure, a slit can be provided at an arbitrary location in the fixing substrate, and the substrate to be fixed can be fixed at that location. Therefore, the light source element substrate (6) and the circuit substrate ( 4) does not have to be a structure in which the end faces are aligned with each other. For this reason, restrictions on arrangement of the light source element substrate (6) and the circuit board (4) can be reduced, and the physique of the display device can be reduced.

  The invention according to claim 3 is characterized in that the fixed substrate is thinned at the end portion inserted into the conducting member (7).

  In this manner, by reducing the thickness of the end portion of the fixed substrate, it is possible to facilitate insertion when inserted into the conductive member (7). In this case, if the thickness of all the outer edge portions of the fixed substrate is made thinner than the inside thereof, the fixed substrate can be easily inserted into the conductive member (7).

  According to the fifth aspect of the present invention, an insulating member (6a) is provided at an end of the fixed substrate to be inserted into the conducting member (7), and the fixed substrate is fixed at the position of the insulating member (6a). By being fixed to the circuit board, the circuit portion provided on the fixed substrate and the conductive member (7) are electrically separated from each other. Further, in the invention described in claim 6, an insulating member (8) is provided in a portion of the fixed member that comes into contact with the conducting member (7), and the insulating member (8) is provided on the fixed substrate. The circuit portion and the conductive member (7) provided are electrically separated from each other.

  Thus, the insulating members (6a, 8) are provided at the end of the fixed substrate to be inserted into the conductive member (7), or at the portion of the fixed member that contacts the conductive member (7). For example, when the substrate to be fixed is configured by a metal base substrate, it is possible to prevent the substrate to be fixed from being electrically connected to the conductive member (7). In this case, as shown in claim 5, if the insulating member (6a) is formed at the end of the fixed substrate inserted into the conductive member (7), the fixed substrate becomes the conductive member (7). ) Can be prevented from being electrically connected. Further, as shown in claim 6, if the portion to be fixed is provided in a portion that contacts the conducting member (7), only the portion of the fixed member that does not require electrical conduction is conducted. It can be set as the structure which is not electrically connected with respect to a member (7).

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
In the present embodiment, the present invention is applied to a display device installed on an instrument panel of a vehicle. For example, examples of the display device include instruments such as a speedometer and a tachometer, and a display device of a navigation device.

  FIG. 1 is a diagram showing a cross-sectional configuration of a display device according to a first embodiment of the present invention. Hereinafter, the display device of the present embodiment will be described with reference to this figure.

  As shown in FIG. 1, the display device includes a display plate 1, a light guide plate 2, a reflection plate 3, a circuit board 4, a light emitting diode (hereinafter referred to as LED) 5, a light source element substrate 6, a conduction member 7, and the like. ing.

  The display board 1 is comprised by optical parts, such as a panel by which the information displayed on a display apparatus is displayed like a meter dial plate and a liquid crystal display, and a diffusion member. For example, when the display plate 1 is a meter dial, information such as the vehicle speed is displayed by pointing a desired position on the scale of the meter dial by a rotation pointer (not shown), and the display plate 1 is a liquid crystal display. Information such as vehicle speed is displayed by displaying numbers on the liquid crystal display.

  The light guide plate 2 is a member constituting a transparent optical waveguide made of acrylic or the like. The light guide plate 2 guides light incident from the side edge 2a to the inside and emits it as illumination light from the surface 2b of the light guide plate. In the present embodiment, light is incident from only one of the four side edges 2a. However, in implementing the present invention, the light may be incident from other opposing surfaces.

  The reflecting plate 3 functions as a reflecting member. The reflection plate 3 is disposed in close contact with the back surface 2 c of the light guide plate 2, and the light that leaks from the back surface 2 c of the light guide plate 2 out of the light incident from the side edge 2 a is reflected on the surface of the light guide plate 2. Reflected to the 2b side. The reflection plate 3 can improve the luminance of the illumination light to the display plate 1.

  The circuit board 4 is provided with various electronic components 4 a for displaying information on the display board 1, wiring patterns (not shown), and the like. For example, when a meter dial is used for the display board 1, the circuit board 4 is provided with a motor drive circuit section for controlling a motor for driving a pointer (not shown). When a panel is used, a liquid crystal driving circuit unit for displaying on the liquid crystal panel is provided. The circuit board 4 is also provided with an LED drive circuit unit for controlling the on / off timing of energization of the LED 5 by a drive circuit provided on the light source element substrate 6 described later. The circuit board 4 includes a holding member 4b that accommodates each electronic component 4a, and the reflecting plate 3 and the like are held by the holding member 4b.

  The LEDs 5 are arranged to face the side edges 2 a of the light guide plate 2, and a plurality of LEDs 5 are arranged in a direction perpendicular to the surface 2 b of the light guide plate 2 (perpendicular to the paper surface). The LED 5 is surface-mounted on a portion of the light source element substrate 6 that faces the side edge 2 a of the light guide plate 2. The LED 5 employs a vertical light emitting diode that emits light in a direction perpendicular to the mounting surface of the light source element substrate 6.

  The light source element substrate 6 is provided with a semiconductor switching element or the like for switching on / off the energization of the LED 5. Each LED 5 is incorporated in a desired portion of the light source element substrate 6 so that energization can be controlled by the semiconductor switching element of the light source element substrate 6.

  The semiconductor switching element provided on the light source element substrate 6 is controlled by an LED drive circuit unit provided on the circuit board 4. The light source element substrate 6 is composed of a metal base substrate, glass epoxy (FR4, CEM3), or the like, and is formed on a rectangular metal base substrate via an insulating film, for example. Then, the light source element substrate 6 is fixed to the circuit board 4 via the conducting member 7 so that each LED 5 is arranged to face the side edge 2a of the light guide plate 2 as described above.

  The conducting member 7 is made of metal fixed to the surface of the circuit board 4 and is configured as a clip-like member protruding from the surface of the circuit board 4. The conducting member 7 is a connector terminal or the like, and is configured by arranging one member having a U-shaped cross section or two members having an I shape. When such a conducting member 7 is used, the light source element substrate 6 is inserted into the conducting member 7 and sandwiched therebetween, whereby the light source element substrate 6 is fixed to the circuit board 4. Since the conductive member 7 is made of metal, the specific portion of the light source element substrate 6 and the specific portion of the circuit board 4 are electrically connected. As described above, the display device of this embodiment is configured.

  Next, the operation of the display device having the above configuration will be described.

  When the LED 5 is driven by the LED drive circuit unit provided on the light source element substrate 6 and the circuit board 4, the light emitted from the LED 5 is incident on the side edge 2 a of the light guide plate 2 and guided into the light guide plate 2. Thereafter, the light is emitted as illumination light from the surface 2 b of the light guide plate 2. At this time, light that is about to leak from the back surface 2 c of the light guide plate 2 is reflected by the reflecting plate 3 toward the front surface 2 b side.

  The light emitted from the surface 2 b of the light guide plate 2 is emitted from the display plate 1. When the display plate 1 constitutes a meter dial plate by this light, the meter dial plate is illuminated. When the display plate 1 constitutes a liquid crystal display, the circuit board 4 is illuminated. The liquid crystal display is driven by the liquid crystal driving circuit unit provided in the display, whereby display on the liquid crystal display is performed.

  Next, effects of the display device configured as in the present embodiment will be described.

  In the display device according to the present embodiment, the circuit board 4 serves as a fixing substrate for fixing the light source element substrate 6, and serves as a fixed substrate on the side to which the light source element substrate 6 is fixed. In such a structure, the conductive member 7 is provided on the surface of the circuit board 4 that functions as a fixing substrate, and the light source element substrate 6 is inserted into the conductive member 7, whereby the light source element substrate 6 is connected to the circuit board 4. Is supposed to be fixed.

  With such a structure, as compared with the case where the holding member is used and the fixing substrate and the fixed substrate are fixed to the holding member as in the conventional case, the arrangement of the light source element substrate 6 and the circuit substrate 4 is restricted. Can be reduced. That is, since the conducting member 7 can be arranged at an arbitrary position of the circuit board 4 and the circuit board 4 can be arranged there, the end faces of the circuit board 4 and the conducting member 7 are arranged close to each other as in the prior art. This eliminates the restrictions that must be made. This makes it possible to reduce the size of the display device.

(Second Embodiment)
A second embodiment of the present invention will be described. Since the basic structure of the display device of this embodiment is the same as that of the first embodiment, only the parts different from the first embodiment will be described here.

  FIG. 2 shows a cross-sectional structure of the display device according to the present embodiment. As shown in this figure, the circuit board 4 is formed with slits (through holes) 4 c penetrating from the front surface to the back surface of the circuit board 4. The light source element substrate 6 is inserted from the front surface of the circuit board 4 through the slit 4c and is sandwiched between the conductive members 7 on the back surface side.

  With such a structure, the slit 4c can be provided at an arbitrary position in the circuit board 4 serving as the fixing substrate, and the light source element substrate 6 serving as the fixed substrate can be fixed at that position. Therefore, the light source element substrate 6 and the circuit substrate 4 do not have to have a structure in which the end surfaces are aligned with each other. For this reason, restrictions on the arrangement of the light source element substrate 6 and the circuit board 4 can be reduced, and the physique of the display device can be reduced as in the first embodiment.

(Third embodiment)
A third embodiment of the present invention will be described. Since the basic structure of the display device of this embodiment is the same as that of the first embodiment, only the parts different from the first embodiment will be described here.

  FIG. 3 shows a cross-sectional structure of the display device according to the present embodiment. As shown in this figure, the light source element substrate 6 serving as the fixed substrate has a reduced thickness at the end inserted into the conducting member 7. Specifically, the thickness of the end portion of the light source element substrate 6 is continuously reduced to sharpen the tip.

  In this way, by reducing the thickness of the end portion of the light source element substrate 6, it is possible to prevent the occurrence of a catch or the like when inserting the conductive member 7 and to facilitate the insertion.

  In addition, although the structure which made the thickness of the edge part of the light source element board | substrate 6 thin was shown here with respect to 1st Embodiment, as FIG. 4 shows, similarly to 2nd Embodiment, the light source element board | substrate 6 is shown. It is also possible to adopt a configuration in which the thickness of the end of the is reduced.

(Fourth embodiment)
A fourth embodiment of the present invention will be described. Since the basic structure of the display device of this embodiment is the same as that of the first embodiment, only the parts different from the first embodiment will be described here.

  FIG. 5 shows a cross-sectional structure of the display device according to the present embodiment. As shown in this figure, a portion of the light source element substrate 6 that does not need to be electrically connected to the conducting member 7 is covered with an insulating member 8. Further, a portion of the circuit board 4 that contacts the end of the light source element substrate 6 (between the conductive members 7) is also covered with the insulating member 9.

  As described above, when the insulating member 8 is provided in a portion of the light source element substrate 6 that is to be fixed to be in contact with the conductive member 7, for example, when the light source element substrate 6 is formed of a metal base substrate, the light source It is possible to prevent the element substrate 6 from being electrically connected to the conducting member 7. Further, with respect to the circuit board 4 serving as the fixing substrate, the light source element substrate 6 is configured as a circuit when the light source element substrate 6 is formed of a metal base substrate by covering the portion that contacts the light source element substrate 6 with the insulating member 9. Electrical connection to the substrate 4 can be prevented.

(Fifth embodiment)
A fifth embodiment of the present invention will be described. Since the basic structure of the display device of this embodiment is the same as that of the first embodiment, only the parts different from the first embodiment will be described here.

  FIG. 6 shows a cross-sectional structure of the display device according to the present embodiment. As shown in this figure, the end of the light source element substrate 6 to be fixed to the fixing member 7 is constituted by the insulating member 6a, and the tip is continuously reduced in thickness. Is.

  Even with such a configuration, the same effect as in the fourth embodiment can be obtained. Furthermore, in this embodiment, since the tip of the light source element substrate 6 on the side fixed to the conducting member 7 is thinned, the same effect as that of the second embodiment can be obtained.

  In this case, as shown in FIG. 7, the entire outer edge of the light source element substrate 6 can be made the insulating member 6a.

(Sixth embodiment)
A fifth embodiment of the present invention will be described. Since the basic structure of the display device of the present embodiment is the same as that of the first embodiment, only the parts different from the fifth embodiment will be described here.

  FIG. 8 shows a cross-sectional structure of the display device according to the present embodiment. As shown in this figure, when the end of the light source element substrate 6 on the side fixed to the conducting member 7 is constituted by the insulating member 6a, the specific portion of the circuit board 4 and the specific portion of the light source element substrate 6 Are electrically connected using a harness 10.

  As described above, the circuit board 4 and the light source element substrate 6 are not electrically connected to each other at the place where the circuit board 4 and the light source element board 6 are fixed, that is, at the conductive member 7. And a specific portion of the light source element substrate 6 can be electrically connected using the harness 10.

(Other embodiments)
In each of the above embodiments, the circuit board 4 is used as a fixing board and the light source element board 6 is a fixed board. However, these may be reversed. For example, as shown in FIG. 9, a conductive member 7 is provided on the surface of the light source element substrate 6, and the end of the circuit board 4 is inserted into the conductive member 7, so that the circuit board 4 is attached to the light source element substrate 6. It is good also as a structure fixed.

It is the figure which showed the cross-sectional structure of the display apparatus in 1st Embodiment of this invention. It is the figure which showed the cross-sectional structure of the display apparatus in 2nd Embodiment of this invention. It is the figure which showed the cross-sectional structure of the display apparatus in 3rd Embodiment of this invention. It is the figure which showed the cross-sectional structure of the display apparatus demonstrated as another example of 3rd Embodiment of this invention. It is the figure which showed the cross-sectional structure of the display apparatus in 4th Embodiment of this invention. It is the figure which showed the cross-sectional structure of the display apparatus in 5th Embodiment of this invention. It is the figure which showed the cross-sectional structure of the display apparatus demonstrated as another example of 5th Embodiment of this invention. It is the figure which showed the cross-sectional structure of the display apparatus in 6th Embodiment of this invention. It is the figure which showed the cross-sectional structure of the display apparatus demonstrated by other embodiment of this invention. It is the figure which showed a partial cross-sectional structure of the conventional display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Display board, 2 ... Light guide plate, 2a ... Side edge, 2b ... Front surface, 2c ... Back surface,
3 ... reflector, 4 ... circuit board, 4a ... electronic component, 4b ... holding member, 4c ... slit,
5 ... LED, 6 ... light source element substrate, 6a ... insulating member, 7 ... conducting member, 8 ... insulating member,
9 ... Insulating member ... 10 ... Harness.

Claims (6)

A display board (1) for displaying,
A light guide plate (2) for guiding light toward the back side of the display plate (1);
A light source element (5) for generating the light;
A light source element substrate (6) on which the light source element (5) is assembled;
A display device comprising a circuit board (4) provided with an electronic component (4a) for performing display on the display board (1),
Either one of the light source element substrate (6) and the circuit substrate (4) is a fixing substrate, the other is a fixing substrate, and a clip-like conducting member (7) that holds the fixing substrate to the fixing substrate. ), And the fixed substrate is fixed to the fixing substrate by inserting the clamped substrate into the conductive member (7) and holding the fixed substrate. Display device. The fixing substrate is formed with slits (4c) penetrating the front and back surfaces of the fixing substrate, and the conductive member (7) is located at a position corresponding to the slit (4c) on the back surface of the fixing substrate. ) Is placed,
The fixed substrate is inserted into the slit (4c) from the front surface side of the fixing substrate, and is sandwiched between the conductive members (7) on the back surface side of the fixing substrate. The display device described. 3. The display device according to claim 1, wherein a thickness of the fixed substrate is reduced at an end portion inserted into the conductive member. The display device according to claim 3, wherein all outer edge portions of the fixed substrate are thinner than an inner side of the fixed substrate. An insulating member (6a) is provided at an end of the fixed substrate to be inserted into the conducting member (7), and the fixed substrate is fixed to the fixing substrate at the position of the insulating member (6a). Thus, the circuit portion provided on the fixed substrate and the conductive member (7) are configured to be electrically separated from each other. Display device. An insulating member (8) is provided in a portion of the fixed member that contacts the conductive member (7), and the circuit portion and the conductive member provided on the fixed substrate by the insulating member (8). The display device according to claim 1, wherein the display device is electrically separated from the display device.

Images