JP2001126524A - Back light device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back light device which has improved assembling and working properties. SOLUTION: A back light device includes a light source unit 23 in which a linear shape light source 7 disposed at a side of a light guide plate is maintained in a lamp house 6. The light source unit 23 is disposed inside of a case 2. The case 2 mounted with the light source unit 23 is then mounted with the light guide plate 8 at its outer side. A positioning pin 27a is formed on the inner surface of the case 2, and a positioning hole 28a receiving the pin 27a is formed on the lamp house 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device and a display device having the same.

2. Description of the Related Art Conventionally, in a transmissive display device represented by a liquid crystal display device, a metal back plate is generally mounted so as to cover the entire back surface or only the vicinity of a light source for a backlight. However, in the case of realizing a demand for a thinner and lighter device, eliminating the back plate can be one of effective means. When the back plate is abolished in this way, it is conceivable to provide the lamp house with the function as the appearance component that the back plate has fulfilled. When the lamp house is configured as an external part, the length of the lamp house needs to be extended to the same extent as the width of the device. When the lengths of both end portions of the lamp house are increased as described above, when the lamp house is mounted at a predetermined position of the case from the back side of the case, the holder and the lead wire of the linear light source held by the lamp house are hidden by the lamp house. It turned out that it became invisible, and the problem of hindering the assembling work occurred.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a structure suitable for making the device thinner and lighter.
One. Another object is to increase the workability of assembling the device. Another object is to improve the appearance of the device.

According to a first aspect of the present invention, there is provided a backlight device including a light source unit in which a linear light source disposed on one side of a light guide plate is held in a lamp house. In a backlight device, a unit is mounted from the back side of a case, and the light guide plate is mounted on the case after the light source unit is mounted from the front side of the case. A hole is formed in the house for receiving the pin. According to a second aspect of the present invention, in the backlight device according to the first aspect, the positioning pins and the holes are formed near both ends of the linear light source. The backlight device of the present invention includes a light source unit holding a linear light source disposed on one side of the light guide plate in a lamp house as described in claim 3, wherein the light source unit is mounted from the back side of the case, In a backlight device configured to mount the light guide plate on the case after the light source unit is mounted from the front side of the case, a pair of lead wires of the linear light source is pulled out from one end of the light source unit, and The lead wire and the other lead wire are made substantially perpendicular to each other in an initial drawing direction, and then both the lead wires are drawn in the same direction. According to a fourth aspect of the present invention, there is provided the backlight device according to the third aspect, wherein a tube for defining an initial drawing direction is coated on a base of the lead wire. I do. The backlight device according to the present invention includes a light source unit holding a linear light source disposed on one side of the light guide plate in a lamp house, and mounting the light source unit from the back side of the case. In the backlight device, a pair of lead wires of the linear light source is pulled out from one end of the light source unit at an interval from each other, and an island-shaped portion corresponding to an interval between the pair of lead wires is formed in the case. It is characterized by being formed in. According to a sixth aspect of the present invention, in the backlight device according to the fifth aspect, a pin is formed to protrude from the island portion, and a hole for receiving the pin is formed in the light source unit. It is characterized by the following. The display device according to the present invention is a display device in which a backlight device and a display panel are stacked and arranged between a case and a front frame, as the backlight device, as described in claim 7. 6. The backlight device according to any one of 6 to 6, further comprising:

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to a transmission type liquid crystal display device having a built-in backlight device. First, the general configuration of the liquid crystal display device 1 will be described with reference to FIGS.
The backlight device will be described in detail with reference to FIGS. Note that the present invention can be applied to other display devices including a backlight device. FIG. 1 is a rear view of the liquid crystal display device 1, and FIG. 2 is a cross-sectional view along a portion indicated by II in FIG. As shown in these figures, the liquid crystal display 1
Has a configuration in which a backlight device 4 and a liquid crystal display panel 5 are stacked and arranged between a case 2 and a front frame 3.
The case 2 is made of resin and includes an outer peripheral frame portion having a frame-like contour along the outer periphery of the liquid crystal display device 1 and a central frame portion for mounting the backlight device 4, a circuit board, and the like. The front frame 3 is made of metal, and has a configuration in which an angle portion having an L-shaped cross section is arranged in a frame shape along the outer periphery of the liquid crystal display device 1. The backlight device 4 holds a linear light source 7 in a lamp house 6 having a U-shaped section, and the linear light source 7
The light incident surface 9 is sandwiched between the light guide surfaces 8 so as to face the light incident surface 9. The lamp house 6 is made of sheet metal having a predetermined length, and is arranged along one side of the liquid crystal display device 1, in this example, the long side. The linear light source 7 is composed of a cold cathode tube or the like, and is held integrally with the lamp house 6 by holding the lamp holders 10 provided at both ends thereof at both ends of the lamp house 6. . The lamp holder 10 is
It is made of an insulating elastic member such as rubber. Linear light source 7
A part of the wiring of the lamp house 6 is formed as a flexible substrate 11 and an adhesive member such as a double-sided adhesive tape 12 is used.
It is fixed to the back. The light guide plate 8 is slightly smaller than the planar shape of the liquid crystal display device 1 and is formed of an acrylic plate or the like having a planar shape equivalent to that of the liquid crystal display panel 5. An optical sheet 13 is provided, and a reflection sheet 14 is provided on the back surface.
As shown in FIG. 1, the back surface of the backlight device 4 is exposed from the gap of the case 2 because no back plate is provided on the back surface of the liquid crystal display device 1 as shown in FIG. FIG. 1
, 15 is a circuit board bent and arranged on the back side of the case 3, 16 is a circuit board held on the front side of the case 3,
Reference numeral 17 denotes a protective sheet that covers the circuit board 15. Further, the rear side surface of the lamp house 6 is exposed from the rear surface of the liquid crystal display device 1 as shown in FIG. As described above, in the liquid crystal display device 1, the back plate which is conventionally provided is not provided, and the lamp house 6 is made of a sheet metal having insufficient strength. It is necessary to reinforce the peripheral part. Therefore, the strength of the peripheral portion of the lamp house 6 is increased by attaching and fixing parts having insufficient strength to each other, thereby enhancing the bending rigidity and the impact resistance. First, the reinforcing tape 18 extends over substantially the entire length of the lamp house 6 so as to extend over the lamp house 6 and the outer surface of the front frame 3.
Is affixed. In this manner, by attaching the reinforcing tape 18, the lamp house 6 and the front frame 3 can be reliably fixed with the side surface of the case 2 sandwiched therebetween, thereby increasing the strength around the lamp house 6 and In addition, the intrusion of dust can be prevented. Further, in order to mount the front frame 3, a plurality of projections 19 are discretely formed at appropriate places on the side surface of the case 2, and the front frame 3 is provided with a hook 20 which engages with the projection 19. However, these protrusions 1
The reinforcing tape 18 is stuck so as to cover the engagement portion between the hook 9 and the hook portion 20. Thus, lamp house 6
By covering the bottom surface of the front frame 3 and the side surfaces of the front frame 3 with the reinforcing tape 18 attached thereto, in addition to increasing the strength, the appearance can be improved, and the dust and the like pass through the engagement portion and the clearance around it. It is possible to prevent dust from entering inside. Further, the lamp house 6 and the case 2 are adhered to each other using an adhesive member, in this example, a double-sided adhesive tape 21 over substantially the entire length of the lamp house 6, thereby increasing the strength. Here, since the mounting of the lamp house 6 is performed from the back side of the case 2 to the front side, that is, with the movement from the bottom to the top, the upper surface of the lamp house 6 is fixed to the case 2 with the double-sided adhesive tape 21. Will be. Correspondingly, the cross-sectional shape of a part of the case 2, that is, the part to which the lamp house 6 is fixed is an inverted L-shape. Further, the reverse L-shaped section of the case 2 and the edge of the liquid crystal display panel 5 are bonded to the back surface of the front frame 3 by an adhesive member.
In this example, the strength is increased by sticking using the double-sided adhesive tape 22. As described above, by fixing components having relatively low strength to each other, it is possible to increase the strength, particularly the bending rigidity and the impact resistance. In particular, when a sheet metal lamp house 6 suitable for thinning is used, the strength of the peripheral portion can be increased, so that the device can be made thinner and lighter. Next, details of the backlight device 4 will be described below with reference to FIGS. Here, FIG. 3 is a plan view of a unit (hereinafter, light source unit 23) in which the linear light source 7 and its related components are incorporated in the lamp house 6, FIG. 4 is a plan view of the lamp house 6, and FIG. FIG. 6 is a partially broken plan view of the related parts, and FIG.
FIG. 7 is a bottom view of a main part of the case 2 in a state where the lamp house 6 is seen through in a state where the lamp housing 6 is incorporated. The light source unit 23 has a planar shape as shown in FIG. 3 by holding the linear light source 7 in a lamp house 6 made of sheet metal. The plan shape of the lamp house 6 is as shown in FIG. 4, and mounting portions 6b and 6c are provided at both ends of the main plate 6a, and a portion 6d having a U-shaped cross section is formed by bending one end between them.
Is formed. As shown in these figures, the lamp house 6 has a configuration in which mounting portions 6b and 6c at both ends thereof are extended to both sides of a U-shaped section 6d in order to constitute an external part instead of the back plate. Thus, the display device 1 is formed to have the same length as one side. The arrangement of the linear light source 7 and the related components is as shown in FIG. A pair of lead wires 7a and 7b for supplying power to the linear light source
A part of the wiring is extended to one end of the linear light source 7 via the flexible substrate 11 as described above. The first lead wire (low voltage side) 7a connected to the flexible substrate 11 is a linear light source 7
Are pulled out in the same direction as the longitudinal direction. A second lead wire (high voltage side) 7b connected to one end of the linear light source 7 is
Elbow structure 10a formed on rubber lamp holder 10
Is drawn once in a direction orthogonal to the longitudinal direction of the linear light source 7, and then an initial drawing that is bent at substantially a right angle is performed and drawn out in the same direction as the first lead wire 7a. The bases of the first and second lead wires 7a and 7b are covered with tubes 24a and 24b.
The tubes 24a and 24b are heat-shrinkable insulating tubes that are shrink-formed by applying heat, and have two functions of shaping the initial shape of the ends of the lead wires 7a and 7b and insulating the leads. Further, the tubes 24a, 24
b is set to a length such that its ends are located outside the lamp house 6 so that the lead wires 7a and 7b are not damaged by the edge of the sheet metal lamp house 6. Then, when the tube is thermally contracted, the lead wires 7a and 7b and the tubes 24a and 24b before contraction are arranged in a mold corresponding to the shape as shown in FIG. In addition, the base shape of the second lead wires 7a and 7b can be formed and held in a desired shape. The light source unit 23 is positioned and arranged from the back side of the case 2. Here, on the back side of case 2, as shown in FIG.
A groove-shaped storage portion 25 for storing a linear light source, a lamp holder, and a lead wire is formed. As shown in FIG. 7, the bases of the lead wires 7a and 7b and the groove for accommodating the lamp holder 10 correspond to the lead wire shape shown in FIG. 5 and are located on an extension of the linear light source accommodating portion 25a. And an L-shaped second groove 25c branched from the groove 25b. A lead wire 7 is provided between these grooves 25b and 25c.
An island 26 is formed to prevent the lamp holder 10 and the linear light source 7 from coming out of the lamp house 6 and coming out of the lamp house 6 by a and 7b being pulled in the drawing direction. In the vicinity of both ends of the linear light source 7, a pair of positioning pins 27a and 27b and a corresponding through hole 28 are provided.
a and 28b are arranged. The one pin 27a is formed so as to protrude from the island-shaped portion 26. These pins 2
Holes 29a and 29b for screwing the lamp house 6 are formed near 7a and 27b. The other pin 27b is located on the back side of the case 2 so as to be located near the end of the linear light source 7 opposite to the side on which the pin 27a is provided. The through holes 28a and 28b are
At the time of mounting, the pins 27a and 27b are positioned and formed on the main plate 6a of the lamp house 6 so that the pins 27a and 27b can be mounted while being checked. When the light source unit 23 is mounted upside down on the case 2 which is arranged upside down (front and back), the holder 10 of the linear light source 7 and the bases of the lead wires 7a and 7b are covered by the lamp house 6 and become invisible. As described above, since the bases of the lead wires 7a and 7b are covered with the tubes 24a and 24b and are formed into a predetermined shape, the bases of the lead wires 7a and 7b are formed in the storage portion 25 of the case 2 in comparison with the case where no processing is performed. Workability at the time of storage can be improved. Further, since the pins 27a and 27b are protruded from the rear side of the case 2 and the holes 28a and 28b for pin penetration are formed in the lamp house corresponding to the pins 27a and 27b, the lamp house 6 may be blind as described above. However, both can be accurately positioned.
In particular, at the end on the side where there are two lead wires and positioning is difficult, the positioning pin 27a is formed on the island 26 where the lead wire branches, so that the groove portion which faces the light source unit 23 is located. 25b, 25c lead wire 7a,
The positioning when arranging 7b becomes very easy. When the positioning of the light source unit 23 is completed, the screws 31, 3
1 through holes 29a. The light source unit 23 is fixed by screwing to the light sources 29b, 30a, and 30b. When the fixing is completed, the light guide plate 8 and the reflection sheet 14 are mounted from the front side of the case 2. Here, one ends of the light guide plate 8 and the reflection sheet 14 are inserted into the U-shaped section 6 d of the lamp house 6. When the mounting of the light guide plate 8 is completed, the optical sheet 13 and the liquid crystal display panel 5 are sequentially laminated thereon, and then the front frame 3 is mounted so as to cover from above. The front frame 3 is fixed by engaging a hook portion 20 formed at an appropriate position on the side surface thereof with the projection 19 of the case 2. Thereafter, the reinforcing tape 18 is attached as necessary.

As described above, according to the present invention, it is possible to provide a structure suitable for making the device thinner and lighter. Further, the workability of assembling the device can be improved. Further, the appearance of the device can be improved.

[Brief description of the drawings]

FIG. 1 is a rear view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a portion taken along a line II of FIG.

FIG. 3 is a plan view of the light source unit 23.

4 is a plan view of the lamp house 6. FIG.

FIG. 5 is a partially broken plan view of the linear light source 7 and its related components.

FIG. 6 is a bottom view of a main part in a partially transparent state.

FIG. 7 is a bottom view of a main part of the case 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Case 3 Front frame 4 Backlight device 5 Liquid crystal display panel 6 Lamp house 23 Light source unit 27 Pin 28 hole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) // F21Y 103: 00 G02F 1/1335 530 (72) Inventor Kenji Hirao 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Address Tottori Sanyo Electric Co., Ltd. (72) Inventor Yuichi Tsubaki 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd.F-term (reference) AA18 BB12 BB15 EE26 KK03 KK05

Claims (7)

[Claims] A light source unit that holds a linear light source disposed on one side of a light guide plate in a lamp house; the light source unit is mounted from the back side of a case; and the light guide unit is mounted on the case after the light source unit is mounted. A backlight device having a configuration in which a light plate is mounted from the front side of a case, wherein a positioning pin is formed on a back surface of the case, and a positioning hole for receiving the pin is formed in the lamp house. apparatus. 2. The backlight device according to claim 1, wherein the positioning pins and holes are formed near both ends of the linear light source. 3. A light source unit which holds a linear light source disposed on one side of a light guide plate in a lamp house. The light source unit is mounted from the back side of a case, and the light guide unit is mounted on the case after the light source unit is mounted. In a backlight device having a configuration in which a light plate is mounted from the front side of a case, a pair of lead wires of the linear light source is drawn out from one end of the light source unit, and an initial lead-out direction of one lead wire and the other lead wire. The backlight device is characterized in that the two lead wires are drawn out in the same direction after making the two substantially orthogonal. 4. The backlight device according to claim 3, wherein the base of the lead wire is covered with a tube for defining an initial drawing direction. 5. The backlight device according to claim 1, further comprising a light source unit holding a linear light source disposed on one side of the light guide plate in a lamp house, wherein the light source unit is mounted from the back side of a case. A backlight device comprising: a pair of lead wires extending from one end of the light source unit at an interval from each other; and an island-shaped portion corresponding to a space between the pair of lead wires is formed in the case. . 6. The backlight device according to claim 5, wherein a pin is formed in the island-shaped portion so as to protrude, and a hole for receiving the pin is formed in the light source unit. 7. A display device in which a backlight device and a display panel are stacked and arranged between a case and a front frame,
A display device comprising the backlight device according to any one of claims 1 to 6 as the backlight device.