JP4363288B2 - Backlight device and liquid crystal display device including the same - Google Patents

Description

  The present invention relates to a liquid crystal display device, and more particularly to the structure of the backlight device.

  As the backlight device of the liquid crystal display device, an edge light type in which a light source unit is disposed at the end of the light guide plate is mainly used in order to obtain a thin structure. For example, in Patent Document 1, the light source unit has a configuration in which a linear light source including a cold cathode tube is held via a lamp holder in a lamp house having a U-shaped cross section.

FIG. 4 shows a perspective view of a general lamp holder. The lamp holder 100 is L-shaped, and the inside thereof is formed into a cavity. A lamp and a lamp cable are inserted in the direction of arrow D from the opening 101 at one end thereof, and the direction of arrow E from the opening 102 in the other end. Pull out the lamp cable. When assembling, the lamp and the lamp cable may be soldered first and then inserted into the lamp holder. However, in general, the lamp cable is inserted into the lamp holder and the end portion is taken out from the opening 101, and the lamp cable and the lamp cable are inserted. Are assembled by pulling the lamp cable in the direction of arrow E.
JP 2001-273807 A

  However, in Patent Document 1, since there is no member for fixing the lamp cable, there is a problem that the lamp cable is separated from the lamp house and it is difficult to insert the light source unit into the case. In addition, since the lamp house has a complicated crank shape, it is difficult to obtain a desired dimension, and the cost of creating a mold becomes high.

  On the other hand, in the lamp holder shown in FIG. 4, the insertion direction of the lamp cable is perpendicular to the drawing direction. As a result, even if the lamp and the lamp house are made thinner and smaller, the end portion of the lamp holder and the lamp cable drawn from the end protrude from the outer periphery of the lamp house. As a result, thinning and miniaturization of the light source unit are hindered.

  An object of the present invention is to reduce the thickness and size of a backlight device and further a liquid crystal display device by reducing the thickness and size of a light source unit.

  In order to achieve the above object, the present invention provides a linear lamp, a lamp cable connected to the lamp, a lamp holder that covers the lamp and a connection portion of the lamp cable, and fixes the lamp holder and In a backlight device including a light source unit having a lamp reflector that reflects light emitted from a lamp, the lamp holder has a first opening and a first cavity, and supports an end of the lamp. A lamp support portion; a second cavity portion formed substantially parallel to the first cavity portion; and a second portion formed at an end portion of the second cavity portion in the same direction as the first opening portion. A lamp cable support portion that supports an end portion of the lamp cable, and wall surfaces of the first and second cavities are divided, and the first cavity portion and the second cavity portion are divided. Communicate with the club And it is characterized in that it comprises a groove and extending to said first and second openings.

  According to this configuration, the lamp and the lamp cable can be inserted into the lamp holder in a soldered state, and the lamp and the lamp cable are arranged in parallel.

  In the above backlight device, the first cavity is made longer than the second cavity, the end of the first cavity opposite to the first opening, and the second It is desirable to arrange the end of the cavity opposite to the second opening.

  Further, in the backlight device described above, between the second opening and the first opening from the end of the second cavity opposite to the second opening in the groove. It is desirable that the portion up to the predetermined position is thicker than the lamp cable.

  According to this configuration, the lamp cable passes through the second cavity portion and the thick groove portion, passes along the thin groove portion via the lamp reflector, and the lamp cable is arranged in an S shape. .

  In the above backlight device, it is preferable that the lamp reflector has a cross-sectional shape in which one of the U-shaped corners is chamfered with a straight line, and the lamp cable is put on the chamfered portion.

  According to this configuration, it is not necessary to form the lamp reflector in a complicated crank shape in order to make the lamp cable run.

  In the above backlight device, it is desirable that the lamp cable and the lamp reflector are bonded.

  The liquid crystal display device of the present invention is equipped with the above backlight device.

  According to the first aspect, since the lamp and the lamp cable are arranged in parallel, the light source unit can be reduced in thickness and size.

  According to the second aspect, the first or second cavity is not lengthened unnecessarily, and the light source unit can be reduced in size.

  According to the third aspect, since the lamp cable is arranged in an S shape, the outer periphery of the lamp holder and the outer periphery of the lamp cable are flush with each other. This prevents the lamp cable from being caught when the light source unit is inserted into the case during assembly or lamp replacement. Further, since the lamp cable does not protrude, the light source unit can be thinned and the installation area of the light source unit can be reduced, so that the backlight device can be thinned and miniaturized.

  According to claim 4, since it is not formed into a complicated crank shape, it is easy to obtain a desired dimension, and the mold preparation cost is also low.

  According to the fifth aspect, since the lamp cable and the lamp reflector are bonded, it is possible to prevent the lamp cable from being caught when the light source unit is inserted into the case at the time of assembly or lamp replacement.

  According to the sixth aspect, since the backlight device that is thin and small is mounted, the liquid crystal display device can also be thin and small.

  1 is a cross-sectional view of a liquid crystal display device, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a perspective view of a lamp holder. The liquid crystal display device 10 includes a backlight device 11 having a light source, a liquid crystal panel 12, a control unit (not shown) that controls the liquid crystal display device 10, a front frame 13 and a protective sheet 14 that cover the front surfaces thereof, And a back cover 15 that covers the back surface.

  The backlight device 11 is housed in a frame-shaped case 16 having an opening, various optical sheets 17 fitted in the opening of the case 16, a light source unit 18 housed in the case 16, and the case 16. The light guide plate 19 and the reflection sheet 20, and the back cover 21 that covers the light source unit 18, the light guide plate 19, and the reflection sheet 20 and fits into the case 16.

  The light source unit 18 fixes a linear lamp 22 made of a cold cathode tube, a lamp cable 23 connected to the lamp 22, a lamp holder 24 that covers the lamp 22 and the connection portion of the lamp cable 23, and the lamp holder 24. And a lamp reflector 25 that reflects light emitted from the lamp 22.

  The lamp 22 and the lamp cable 23 are connected by solder 26. The lamp holder 24 supports the end of the lamp 22, so that the lamp holder 24 c having the first opening 24 a and the first cavity 24 b and the end of the lamp cable 23 are supported by the first cavity 24 c. A lamp having a second cavity portion 24d formed substantially parallel to the portion 24b and a second opening portion 24e formed at an end in the same direction as the first opening portion 24a of the second cavity portion 24d. The cable support 24f and the wall surfaces of the first and second cavities 24b and 24d are divided, the first cavity 24b and the second cavity 24d communicate with each other, and the first and second openings. 24a, 24e and the groove part 24g extended. In addition, as a material of the lamp holder 24, it is preferable to use an elastic body, for example, rubber can be used.

  The first cavity 24b is longer than the second cavity 24d, the end 24h of the first cavity 24b opposite to the first opening 24a, and the second cavity 24d. The end 24i opposite to the opening 24e is preferably arranged in parallel as shown in FIG. Thereby, the 1st or 2nd cavity part 24b, 24d is no longer lengthened, and the light source unit 18 can be reduced in size.

  Further, a portion of the groove 24g from the end 24i to a predetermined position between the second opening 24e and the first opening 24a (hereinafter referred to as a thick groove 24g1) is a lamp cable 23 as shown in FIG. It is desirable to be thicker. On the other hand, the groove portions (thin groove portions 24g2) other than the thick groove portion 24g1 are desirably thinner than the lamp cable 23 as shown in FIG. In the state where the lamp holder 24 is inserted into the lamp reflector 25, the ratio of the thick groove portion 24g1 and the narrow groove portion 24g2 is designed so that the end of the lamp reflector 25 reaches the thick groove portion 24g1.

  At the time of assembly, after the lamp cable 23 is soldered to the lamp 22, the end of the lamp 22 and the end of the lamp cable 23 are inserted into the lamp holder 24 in the direction of arrow B in FIG. At this time, the lamp cable 23 is inserted into the second cavity 24d through the groove 24g. The inserted lamp cable 23 is pulled out in the direction of arrow C in FIG. Then, the lamp holder 24 is inserted into the lamp reflector 25 and fixed. This can be fixed by fitting a projection (not shown) provided on the outer periphery of the lamp holder 24 with a hole (not shown) formed in the lamp reflector 25.

  With this configuration, the lamp cable 23 passes through the second cavity portion 24d and the thick groove portion 24g1 and passes along the narrow groove portion 24g2 via the lamp reflector 25. That is, the lamp cable 23 is arranged in an S shape as shown in FIG. As a result, the outer periphery of the lamp cable support 24f and the outer periphery of the lamp cable 23 are flush with each other. This prevents the lamp cable 23 from being caught when the light source unit 18 is inserted into the case 16 during assembly or lamp replacement. Further, since the lamp cable 23 and the lamp cable support portion 24f do not protrude, the light source unit 18 can be made thin and small, and the installation area of the light source unit 18 can be reduced. Therefore, the backlight device 11 and the liquid crystal display device 10 can be reduced. Can be reduced in thickness and size.

  The lamp reflector 25 is formed by processing a metal such as aluminum into a sheet metal, and the inner surface thereof is subjected to reflection plating. The cross section of the lamp reflector 25 is a shape in which one corner of the U-shape is chamfered with a straight line, and the lamp cable 23 is held on the chamfered portion. Thus, since the lamp cable 23 is put on the straight chamfered portion, it is not formed into a complicated crank shape as in Patent Document 1, so that a desired dimension can be easily obtained and the cost for creating a mold is low.

  Note that the lamp cable 23 and the lamp reflector 25 are preferably bonded with an adhesive or a double-sided tape. This is to prevent the lamp cable 23 from being caught when the light source unit 18 is inserted into the case 16 during assembly or lamp replacement.

  The backlight device of the present invention is equipped with a light source unit using a linear lamp made of a cold cathode tube or the like. Further, the liquid crystal display device of the present invention is equipped with the backlight device, and can be used for both a direct view type and a projection type.

It is sectional drawing of the liquid crystal display device of this invention. It is the sectional view on the AA line of FIG. It is a perspective view of the lamp holder of this invention. It is a perspective view of the conventional lamp holder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Liquid crystal display device 11 Backlight apparatus 18 Light source unit 22 Lamp 23 Lamp cable 24 Lamp holder 24a 1st opening part 24b 1st cavity part 24c Lamp support part 24d 2nd cavity part 24e 2nd opening part 24f Lamp cable Support portion 24g Groove portion 24h End portion of first cavity portion opposite to first opening portion 24i End portion of second cavity portion opposite to second opening portion 25 Lamp reflector

Claims (6)

A linear lamp; a lamp cable connected to the lamp; a lamp holder that covers the lamp and the connection portion of the lamp cable; and a lamp reflector that fixes the lamp holder and reflects light emitted from the lamp. In the backlight device including the light source unit, the lamp holder includes a first opening and a first cavity, a lamp support that supports an end of the lamp, and the first cavity. A second cavity formed substantially parallel to the first cavity, and a second opening formed at an end of the second cavity in the same direction as the first opening, and the lamp cable A lamp cable supporting portion for supporting the end portion of the lamp cable, and wall surfaces of the first and second cavities, and the first and second cavities communicate with each other, and the first and second cavities communicate with each other. Extends to the second opening Backlight apparatus characterized by comprising a groove. The first cavity is longer than the second cavity, the end of the first cavity opposite to the first opening, and the second opening of the second cavity The backlight device according to claim 1, wherein an end portion opposite to the portion is arranged in parallel. Of the groove, the portion from the end of the second cavity opposite to the second opening to a predetermined position between the second opening and the first opening is The backlight device according to claim 1, wherein the backlight device is thicker than the lamp cable. 4. The back according to claim 1, wherein a cross-section of the lamp reflector has a shape in which one corner of a U-shape is chamfered with a straight line, and the lamp cable is put on the chamfered portion. Light equipment. The backlight device according to claim 1, wherein the lamp cable and the lamp reflector are bonded to each other. A liquid crystal display device equipped with the backlight device according to claim 1.

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