JP4861135B2 - LCD module - Google Patents

Description

  The present invention relates to a liquid crystal module.

  In recent years, liquid crystal display devices have been actively used to display various types of information. Such a liquid crystal display device has excellent characteristics such as thinness, light weight, and low power consumption. For example, it is used in many applications such as a small liquid crystal monitor for car navigation, a display for a video camera, and a display screen for a mobile phone. It is used for.

  Some liquid crystal modules used in these liquid crystal display devices are provided with a so-called backlight that is illuminated from the back of the liquid crystal to make the display easier to see. There are two types of backlights: a direct type backlight in which illumination means is arranged on the back surface of the liquid crystal, and an edge light type in which a transparent plate called a light guide plate is arranged on the back surface of the liquid crystal and illuminates from the side surface of the light guide plate. However, as the display device becomes thinner, an edge light type that can save installation space is becoming mainstream.

  By the way, in such a backlight, heat is generated by the light source, and the performance of the light source may be deteriorated or display unevenness of the liquid crystal may occur due to the heat. For this reason, in order to dissipate the heat generated by the light source of the backlight, a liquid crystal module that dissipates heat from a heat sink provided for heat dissipation via an aluminum heat conducting member has been proposed (see Patent Document 1).

  There has also been proposed a liquid crystal module in which a metal plate is provided on the back surface of a backlight to form a heat radiating plate (see Patent Document 2).

  In addition, a liquid crystal module has been proposed in which a large number of through holes are formed in a printed circuit board on which a light source is mounted to enhance a heat dissipation effect (see Patent Document 3).

Furthermore, a method of using a printed pattern of a substrate on which a light source is mounted as a heat radiating member is generally used.
JP 2006-156324 A JP 2002-91330 A JP 2006-190721 A

  By the way, in the liquid crystal module described in Patent Document 1, it is necessary to provide a heat conductive member made of aluminum and a heat sink for heat dissipation, which makes it difficult to reduce the size of the device and increases the number of parts and costs. was there.

  Further, the liquid crystal module described in Patent Document 2 has a problem that it is necessary to separately provide a metal plate as a heat radiating plate, resulting in an increase in the number of parts and cost.

  In addition, in the liquid crystal module described in Patent Document 3, it is necessary to provide a large number of through holes on the printed circuit board, and in an edge light type printed circuit board in which the printed circuit board has an elongated shape, the required number of positions are required. There was a problem that there was a high possibility that a space for providing a through hole could not be secured.

  Moreover, when using the printed pattern of a board | substrate as a heat radiating member, since the printed pattern was restrict | limited by wiring, there existed a problem that it was difficult to ensure sufficient heat dissipation performance.

  The subject of this invention is providing the liquid crystal module which improves the heat dissipation effect of the heat_generation | fever by the light source of a backlight by devising the shape of the board | substrate which mounts the light source of a backlight, and the housing | casing which hold | maintains a board | substrate.

  In order to solve the above-described problems, the invention described in claim 1 includes a liquid crystal unit, a backlight unit that includes a light source installed on a substrate unit and illuminates the liquid crystal unit from the back, the backlight unit, and the liquid crystal A liquid crystal module including a housing for holding the unit, wherein the substrate portion has an extending portion that extends in the rear surface direction of the housing and has a heat radiation circuit pattern that extends to the light source. And the said housing | casing was provided with the opening part which the said extension part penetrates, It is characterized by the above-mentioned.

  According to the said structure, the thermal radiation effect of the heat | fever which a light source part generate | occur | produces can be heightened by providing the extended part by which the circuit pattern for thermal radiation connected to a light source was extended.

  According to a second aspect of the present invention, in the liquid crystal module according to the first aspect of the present invention, a dustproof member is installed between the liquid crystal unit and the backlight unit.

  According to the above configuration, since the space between the liquid crystal unit and the backlight unit is hermetically sealed, it is possible to prevent external dust from being mixed and display quality from being deteriorated.

  According to a third aspect of the present invention, in the liquid crystal module according to the first or second aspect, the opening has a slit shape, and opposing edges are coupled to a plurality of locations along the longitudinal direction. It is characterized by providing a bridge part.

  According to the above configuration, the strength of the opening can be ensured by the bridge portion.

  According to a fourth aspect of the present invention, in the liquid crystal module according to the third aspect, a slit is provided in the extending portion of the substrate portion at a position corresponding to the bridge portion provided in the opening. The bridge portion is inserted into the slit.

  According to the said structure, a bridge | bridging part bites with a board | substrate part and the intensity | strength of a bridge | bridging part can be ensured.

  According to a fifth aspect of the present invention, in the liquid crystal module according to the first aspect, a convex portion is provided on the outer side of the casing so as to surround the extended portion inserted through the opening. It is characterized by.

  According to the above configuration, since the liquid crystal module is hermetically sealed, it is possible to prevent external dust from being mixed and display quality from being deteriorated.

  Furthermore, the invention according to claim 6 is the liquid crystal module according to any one of claims 1 to 5, wherein at least one supporting portion for supporting the substrate portion in the front-rear direction, the left-right direction, and the up-down direction is provided. It is characterized by having one.

  According to the above configuration, the substrate unit is securely fixed to the housing, and no low-frequency sound is generated by vibration.

  By devising the shape of the substrate on which the light source of the backlight is mounted and the housing that holds the substrate, a liquid crystal module that enhances the heat dissipation effect of the heat generated by the light source of the backlight can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are configuration diagrams of the embodiment of the present invention.

  The liquid crystal module 10 includes a liquid crystal unit 300, a front case 100 to which the liquid crystal unit 300 is attached, a backlight unit 400 that serves as a backlight of the liquid crystal unit 300, and a rear case 200 to which the backlight unit 400 is attached. Yes. A fitting claw 150 is formed on the side surface of the front case 100, and is fitted with the fitting convex portion 250 of the rear case 200 to be integrated with the rear case 200. The front case 100 and the rear case 200 correspond to a housing in the claims.

  FIG. 3 is a perspective view of the backlight unit 400 attached to the rear case 200.

  The backlight unit 400 includes a light source unit 410 that serves as a light source for backlighting the liquid crystal unit 300, and a light guide unit 420 that receives light from the light source unit 410 and emits surface light.

  When light is incident from the side of the light guide unit 420 in order from the opposite side of the liquid crystal unit 300, the light is reflected from the side by the reflection sheet 421 that reflects the light of the light source 411 of the light source unit 410 and the light source 411. A light guide plate 422 that emits surface light, a diffusion sheet 423 that diffuses light emitted from the light guide plate 422, and two prism sheets 424 that guide the diffused light in a certain direction.

  FIG. 4 shows a configuration diagram of the light source unit 410.

  The light source unit 410 includes a plurality of light sources 411 mounted in a line on a substrate 412 having an elongated shape, and the light sources 411 are electrically connected in parallel. Here, the substrate 412 includes a light source installation part 412A to which the light source 411 is attached and an extension part 412B in which the light source installation part 412A extends in a direction perpendicular to the direction in which the light sources 411 are arranged. The mounting surface of the light source 411 of the light source installation part 412A is covered with copper foil so that the copper foil area becomes as large as possible while maintaining insulation between adjacent light sources and insulation between terminals of the same light source. . Also, a copper foil heat dissipation circuit pattern 413 extending to the light source 411 is extended to the extended portion 412B.

  FIG. 5 is a front perspective view of the rear case 200 in the present embodiment, and FIG. 6 is a rear perspective view.

  The rear case 200 includes a slit-like opening 201 that is long in the left-right direction at the bottom. A bridge portion 202 is formed around the opening 201 in such a manner that opposing edges of the opening 201 are coupled to ensure the strength around the opening 201 and to securely hold the light source portion 410.

  The light source part 410 is attached to the rear case 200 so that the extending part 412B provided on the substrate 412 of the light source part 410 is inserted through the opening 201 from the inner side of the rear case 200 toward the back side.

  Here, as shown in FIG. 7, the right and left light sources 410 are held by the substrate left and right holding portions 203 provided inside the rear case 200 so that the light source portions 410 are securely fixed to the rear case 200. Has been. Further, the upper and lower sides thereof are supported by a substrate up-and-down pressing portion 204 provided inside the rear case 200. Further, the front and rear are supported by a substrate front and rear pressing portion 205 provided inside the rear case 200. As shown in FIG. 10, a slit 415 is provided in the extended portion 412 </ b> B of the substrate 412, and a part of the bridge 202 is inserted into the slit 415 as shown in FIGS. 8 and 9.

  FIG. 10 is a perspective view of a cross section of the bridge portion 202 in the left-right direction. In FIG. 10, the dark gray portion indicates a cross section. As shown in FIG. 10, a substrate left-right positioning convex portion 206 is provided on the inner bottom portion of the bridge portion 202 to eliminate the lateral displacement of the light source portion 410, and the substrate left-right positioning concave portion provided on the substrate 412. 414 is fitted.

  FIG. 11 is a side view of the rear case 200 to which the light source unit 410 and the light guide unit 420 are attached.

  As described above, the extended portion 412B is provided on the substrate 412 on which the light source 411 is mounted to increase the area of the substrate 412, and the heat radiation circuit pattern 413 is provided, thereby enhancing the heat radiation effect of the heat generated by the light source 411. The heat radiation effect can be further enhanced by the cooling effect by air cooling by inserting the opening portion 211 of the rear case 210 and projecting the extending portion 412B to the back surface side of the rear case 210.

  As shown in FIG. 12, dust is prevented between the liquid crystal unit 300 and the backlight unit 400 so that dust or the like is not mixed between the liquid crystal unit 300 and the backlight unit 400 and display quality is deteriorated. The member 500 may be installed.

  FIG. 13 shows a configuration diagram of this embodiment.

  The liquid crystal module 10 includes a liquid crystal unit 300, a front case 100 to which the liquid crystal unit 300 is attached, a backlight unit 400 that serves as a backlight of the liquid crystal unit 300, and a rear case 210 to which the backlight unit 400 is attached. Yes. A fitting claw 150 is formed on the side surface of the front case 100, and is fitted to the fitting convex portion 250 of the rear case 210 to be integrated with the rear case 210. The front case 100 and the rear case 210 correspond to a housing in the claims.

  FIG. 14 is a perspective view of the front side of the rear case 210 in this embodiment, and FIG. 15 is a perspective view of the rear side. In the present embodiment, the shape of the rear case 210 is only partially different from that of the rear case 200 in the above-described embodiment, and other configurations are the same as those in the above-described embodiment. Therefore, only the rear case 210 will be described.

  The rear case 210 includes an opening 211 that is long in the left-right direction. The rear case 210 includes a convex portion 212 that surrounds the opening 211 and has a convex shape on the back (rear) side of the rear case 210. The light source unit 410 is attached to the rear case 210 so that the provided extended portion 412B is accommodated in the convex portion 212 from the inside of the rear case 210.

  Here, as shown in FIG. 16, the light source unit 410 holds the left and right sides of the light source unit 410 on the substrate left and right holding unit 213 provided inside the rear case 210 so that the light source unit 410 is securely fixed to the rear case 210. At the same time, the upper and lower sides thereof are supported by a substrate up-and-down holding part 214 provided inside the rear case 200.

  As shown in FIG. 16, the light guide unit 420 is attached to the rear case 210 so that one side surface thereof faces the light source 411 of the light source unit 410.

  FIG. 17 is a perspective view of the cross section of the convex portion 212 in the left-right direction. As shown in FIG. 17, a substrate left-right positioning convex portion 215 for eliminating a positional deviation in the left-right direction of the light source unit 410 is provided on the inner bottom portion of the convex portion 212, and a substrate left-right positioning concave portion provided on the substrate 412. 414 is fitted.

  FIG. 18 shows a side view of the rear case 210 to which the light source unit 410 and the light guide unit 420 are attached.

  As described above, the extended portion 412B is provided on the substrate 412 on which the light source 411 is mounted, the area of the substrate 412 is enlarged to provide the heat radiation circuit pattern 413, and the convex portion including the opening 211 in the rear case 210. By providing 212 and accommodating the extended portion 412B in the convex portion 212, the heat radiation effect of the heat generated by the light source 411 can be enhanced as compared with the conventional liquid crystal module shown in FIG.

  As mentioned above, although the Example of this invention was explained in full detail with drawing, an Example is only an illustration of this invention and this invention is not limited only to the structure of an Example. Accordingly, it is a matter of course that the present invention includes any design change within a range not departing from the gist of the present invention.

  For example, the size of the extended portion 412B is not limited to that described in the present embodiment, and an arbitrary size can be set.

  Further, the number of light sources 411 is not limited to that described in this embodiment, and an arbitrary number can be set.

  Further, the shapes of the liquid crystal unit, the front case, and the rear case are not limited to those described in the present embodiment, and arbitrary shapes can be set.

It is a perspective view of the liquid crystal module of the embodiment of the present invention. It is a block diagram of the liquid crystal module of embodiment of this invention. It is a perspective view of the rear case incorporating the backlight unit in the liquid crystal module of the embodiment of the present invention. It is a perspective view of the light source part in the liquid crystal module of the embodiment of the present invention. It is a perspective view from the front side of the rear case in the liquid crystal module of the embodiment of the present invention. It is a perspective view from the back side of the rear case in the liquid crystal module of the embodiment of the present invention. It is a perspective view from the front side of the rear case incorporating the backlight unit in the liquid crystal module of the embodiment of the present invention. It is a perspective view from the back side of the rear case incorporating the backlight unit in the liquid crystal module of the embodiment of the present invention. It is another perspective view from the back side of the rear case incorporating the backlight unit in the liquid crystal module of the embodiment of the present invention. It is a perspective view of the section of the bridge part of the back side case in the liquid crystal module of an embodiment of the present invention. It is a side view of the liquid crystal module of the embodiment of the present invention. It is the block diagram which installed the dust-proof member between the liquid crystal unit and the light source part in the liquid crystal module of embodiment of this invention. It is a block diagram of the liquid crystal module of Example 1 of this invention. It is a perspective view from the front side of the rear side case in the liquid crystal module of Example 1 of this invention. It is a perspective view from the back side of the back case in the liquid crystal module of Example 1 of this invention. It is a perspective view from the front side of the rear case incorporating the backlight unit in the liquid crystal module of Example 1 of the present invention. It is a perspective view of the section of the convex part of the back case in the liquid crystal module of Example 1 of the present invention. It is a side view of the liquid crystal module of Example 1 of this invention. It is the perspective view of the light source part in the liquid crystal module of a prior art, and the side view of a liquid crystal module.

Explanation of symbols

10 LCD module 100 Front case (housing)
200, 210 Rear case (housing)
201, 211 Opening part 202 Bridge part 203, 213 Substrate left-right holding part 204, 214 Substrate up-down pressing part (support part)
205 Front / rear holding part (support part)
206, 215 Substrate left and right positioning convex part (support part)
212 Convex part 300 Liquid crystal unit 400 Backlight unit 410 Light source part 411 Light source 412 Substrate 412A Light source installation part 412B Extension part 413 Circuit pattern for heat radiation 414 Substrate left and right positioning concave part 415 Slit 420 Light guide part 500 Dustproof member

Claims (6)

A liquid crystal unit,
A backlight unit that includes a light source installed on the substrate unit and illuminates the liquid crystal unit from the back;
A housing for holding the backlight unit and the liquid crystal unit;
A liquid crystal module comprising:
The substrate portion has an extending portion that extends in the rear surface direction of the housing and has a heat radiation circuit pattern that extends to the light source, and the housing has an opening through which the extending portion is inserted. A liquid crystal module characterized by that.   The liquid crystal module according to claim 1, wherein a dustproof member is installed between the liquid crystal unit and the backlight unit.   3. The liquid crystal module according to claim 1, wherein the opening has a slit shape, and bridge portions are provided at a plurality of locations along the longitudinal direction to connect opposing edges. 4.   4. The extension portion of the substrate portion at a position corresponding to the bridge portion provided in the opening is provided with a slit, and the bridge portion is inserted through the slit. Liquid crystal module according to.   2. The liquid crystal module according to claim 1, wherein a convex portion is provided on an outer side of the casing so as to surround the extended portion inserted through the opening. The liquid crystal module according to claim 1, further comprising at least one support portion that supports the substrate portion in the front-rear direction, the left-right direction, and the up-down direction.

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