JP4411052B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device in which replacement of a backlight and maintenance are easy without exposing wirings connecting each component to the outside.

A liquid crystal display device is usually composed of a flange portion (also referred to as a vessel portion) and a main body portion provided on the back side thereof. Inside the liquid crystal display panel (LCD), a backlight (FL) as a light source thereof is provided. Tube), and a circuit board for driving and controlling them. And a main-body part is inserted in the panel cut provided in this from the front side of the panel, the flange part is contact | abutted to the front surface of the panel, and it is attached to the panel with a screw | thread or a mounting bracket.
In such a liquid crystal display device, the FL tube, which is a backlight, has a long lighting time and needs to be replaced periodically.

Conventionally, in this kind of liquid crystal display device, a front case attached to the front side of the panel cut provided on the panel, a rear case attached to the front case from the back side of the panel with a screw or the like, and a touch panel assembly between both cases There is one that houses a certain housing.
This chassis consists of a front chassis with a liquid crystal panel, backlight and panel body attached, and a rear chassis with a circuit board that is electrically connected to the panel body. Both chassis can be opened and closed by hinges. Concatenated. Then, with the liquid crystal display device attached to the panel, the rear chassis is opened to expose the backlight, and the liquid crystal display device is replaced (for example, see Patent Document 1).

Also, it has a liquid crystal display fixing sheet metal to which the liquid crystal display is screwed on the front side. One end of the liquid crystal display fixing sheet metal is tiltably supported on the front side, and the other end can be attached and detached with a plurality of screws. The sheet metal for the liquid crystal display device that is screwed to the panel is placed on the front side of the panel cut of the control panel and screwed to the panel, and an escutcheon is placed on the front side of the panel to cover it from the back side of the panel A liquid crystal display device that is screwed to a sheet metal for a liquid crystal display device has been proposed.
When replacing the backlight, first remove the screws from the inside of the control panel to remove the escutcheon from the front side of the control panel, and then remove the plurality of screws to be fixed to the sheet metal for the liquid crystal display device. The fixing sheet metal is tilted with the liquid crystal display about one end as an axis, and the backlight is pulled out from the other end in the horizontal direction (for example, see Patent Document 2).
JP 2001-125072 A JP 2002-277874 A

In the liquid crystal display device described in Patent Document 1, when the backlight is replaced, the back case fixed to the front case from the back side of the panel is removed by loosening the screws, and then the tongue of the housing is fixed. Loosen the screw and open the rear chassis through the hinge. Then, loosen and remove the screws that secure the backlight, attach a new backlight and secure it with screws, then close the rear chassis and fix the tongue with screws, and attach the rear case from the rear side and secure with screws. Must.
For this reason, there is a problem that the replacement work of the backlight is very troublesome and requires a great number of man-hours. Similarly, maintenance is extremely troublesome.

  In addition, when the replacement and maintenance of the backlight was completed, the flexible lead sheet provided at the bottom of the panel body of the front chassis of the housing was bent to the back side, and the connecting portion was provided on the circuit board of the back chassis. In addition to being connected to the connector, the flexible lead sheet provided on the side of the panel body is bent to the back side and connected to the other connector provided on the circuit board. Not only is the structure for electrical connection extremely complicated and expensive, but it is very cumbersome because the connecting operation of complicated flexible lead sheets must be performed every time the backlight is replaced or maintenance is performed. .

  In the liquid crystal display device of Patent Document 2, the liquid crystal display fixing sheet metal is tilted and the backlight is pulled out in the horizontal direction for replacement, so it is necessary to remove the liquid crystal display from the panel when replacing the backlight. Although it is not necessary to remove the escutcheon from the panel each time and to remove the screws that fix the other end of the sheet metal for the liquid crystal display, the replacement work is troublesome. Further, since a plurality of screw insertion holes must be provided around the panel cut in order to attach the liquid crystal display device fixing sheet metal to the panel of the control panel, processing of the control panel (panel) is troublesome.

  The present invention has been made to solve the above-described problems, and has as its object to provide a liquid crystal display device in which the replacement of the backlight is extremely easy, can be performed in a short time, and is easy to maintain. It is.

  The liquid crystal display device according to the present invention has a peripheral wall (4) provided with metal fittings (5, 5,...) For penetrating through a panel cut (36) provided on the panel (35) and being locked to the back of the panel. ) And a first opening (2a) that passes from the front side of the panel to the back side through the panel cut, and is fitted to the flange mounting portion (2) that covers the panel cut edge and the fitting mounting portion. And mounting members (25, 25...) That sandwich the panel (35) with the flange portion (2) by pressing the panel back surface with screws (31, 31...), And the first opening. The touch panel (13) and the LCD (14) that can be viewed or contacted from the front side of the panel (35) via the part (2a), and the control unit (20) that controls the touch panel (13) and the LCD (14). A backlight accommodating portion (16a, 16b) for accommodating the FL tube (15a, 15b) for causing the LCD (14) to have an illuminance visible from the front surface of the panel (35), and the FL tube (15a, 15b). ), And a detachable engagement with studs (9, 9...) Provided in the first opening (2a) toward the back side of the flange (2). A main body case (12) to be stopped.

  In the liquid crystal display device according to the present invention, the first opening (2a) includes a hinge portion (37) that rotatably supports one end portion of the main body case (12) on the back side of the flange portion (2). 37).

  In the liquid crystal display device according to the present invention, when the main body case (12) is detached from the first opening (2a), the backlight housing portions (16a, 16b) are connected by the connectors (18, 18). It has the 2nd opening (17a, 17b) which accommodates said FL pipe (15a, 15b) electrically connected with the said drive part (22) so that insertion or extraction is possible.

  According to the present invention, with the liquid crystal display device attached to the panel, the backlight can be replaced simply by removing the main body from the flange or opening it through the hinge. Since it is not necessary to separate the control unit from the control circuit, it is not necessary to remove the wiring, and the circuit part of the printed circuit board is not exposed on the surface. Therefore, the replacement work is extremely easy and can be performed in a short time. Can be greatly improved. In addition, a wiring connection error does not occur. Further, the maintenance of the main body can be easily performed according to the above.

[Embodiment 1]
1 is a perspective view of a liquid crystal display device according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along line BB in FIG. It is a perspective view.
In the figure, reference numeral 1 denotes a liquid crystal display device, which includes a frame-like flange portion 2 made of, for example, a synthetic resin molded product, and a main body portion 11 that is detachably attached to the back side of the flange portion 2.

  A packing mounting groove 3 is provided on the outer peripheral edge of the back surface of the flange portion 2, and a peripheral wall 4 protruding from the packing mounting groove 3 to the back side is further provided inside thereof. Each side of the peripheral wall 4 is integrally formed with a fitting mounting portion 5 that protrudes outward to a position substantially equal to the inner peripheral edge of the packing mounting groove 3 and protrudes further to the back side than the peripheral wall 4. A pair of locking holes 6a and 6b each having a window hole 7 and a slit 8 extending in the same direction are provided in the vicinity of both end portions of each metal mounting portion 5. In addition, the opening part 2a of the flange part 2 has the case where the surface sheet is provided and the case where it is not provided.

  The bracket mounting portion 5 may be provided only on the two opposite sides (left and right or top and bottom) of the peripheral wall 4, and the bracket mounting portion 5 is omitted, and the locking hole 6a is provided in the peripheral wall 4 provided over the entire circumference. , 6b may be provided directly. 9 is a stud provided inside the four corners of the peripheral wall 4 and is provided with screw holes 10.

  The main body 11 has a main body case 12 that is substantially the same size as the inner peripheral edge of the peripheral wall 4 of the flange 2, and a touch panel 13 and an LCD 14 that is a liquid crystal display panel are provided on the front side of the main body case 12. The LCD 14 is provided with backlight accommodating portions 16a and 16b having openings 17a and 17b on the side thereof on the upper and lower sides (or one of them). In the backlight accommodating portions 16a and 16b, FL tubes 15a and 15b, which are backlights, are removably accommodated from the openings 17a and 17b, and a light guide plate is provided on the back side of the LCD 14. ing.

Further, on the back side of the main body case 12, a control unit 20 having a control circuit and the like formed on the printed circuit board 19 is provided. The control unit 20 includes external wiring (not shown) and FL tubes 15a and 15b. Are provided with connectors 21a, 21b and 21c. Reference numeral 22 denotes a drive unit. The touch panel 13 and the LCD 14 provided on the front surface side of the main body case 12 and the control unit 20 provided on the rear surface side are electrically connected directly or through an opening (not shown) provided in the main body case 12. It is not exposed to the outside at all. The FL pipes 15a and 15b are connected to the control unit 20 by a cable connector 18 (see FIG. 9) connected thereto.
Reference numerals 23 denote screw insertion holes provided at the four corners of the main body case 12 corresponding to the screw holes 10 provided in the stud 9 of the flange portion 2. The positions of the stud 9 having the screw hole 10 provided in the flange portion 2 and the screw insertion holes 23 provided in the main body case 12 of the main body portion 11 are not limited to the four corners, but are provided in other places. Also good. Further, the number may be increased as appropriate. In addition, although the case where the control part 20 was provided in the back side of the main body case 12 was shown, you may provide in the front side of the main body case 12, and in this case, LCD14 etc. and the control part 20 are directly connected.

  Such a main body 11 is configured such that the main body case 12 is fitted into the peripheral wall 4 from the back side of the flange portion 2 and placed on the stud 9, and the screw 24 inserted through the screw insertion hole 23 is inserted into the screw hole 10 of the stud 9. By screwing into the flange portion 2, the flange portion 2 is integrally fixed. At this time, the LCD 14 including the touch panel 13 is positioned to face the opening 2 a of the flange portion 2.

  Reference numeral 25 denotes a mounting bracket formed by bending a metal plate for mounting the liquid crystal display device 1 on the panel 35 (see FIG. 6). The bottom plate 26 and both side plates 27a and 27b perpendicular to the bottom plate 26 have a substantially U-shaped cross section. A pair of locking pieces 28a which are slightly projected from the side edge and then bent inward at a substantially right angle above and below one side plate 27a (located on the peripheral wall 4 side of the flange portion 2), 28b is provided. The locking pieces 28a and 28b are formed in a size that can be inserted into the window holes 7 of the locking holes 6a and 6b.

  29a and 29b are screw holes provided in the side plate 29a in the vicinity of the locking pieces 28a and 28b, and 30a and 30b are screw insertion holes provided in the other side plate 27b opposite to the screw holes 29a and 29b. . When the plate thickness of the mounting bracket 25 is thin, nuts communicating with the screw holes 28a, 28b may be attached by welding on the inner surface side of the side plate 27a, or holes may be formed by burring.

Next, an example of a procedure for attaching the liquid crystal display device 1 according to the present embodiment to the panel will be described with reference to FIGS. In both figures, reference numeral 35 denotes a panel, and 36 denotes a panel cut provided on the panel 35, which is formed to have the same size as the outer periphery of the peripheral wall 4 of the flange portion 2 (including the metal fitting mounting portion 5).
First, the peripheral wall 4 including the main body portion 11 of the liquid crystal display device 1 and the metal fitting mounting portion 5 of the flange portion 2 is inserted into the panel cut 36 provided on the panel 35 from the front side, and packing (not shown) is inserted into the packing mounting groove 3. ) Is brought into contact with the front surface of the panel 35.

And the flange part 2 is hold | maintained from the front side of the panel 35, and the upper and lower latching | locking part of the metal fitting part 5 (henceforth right and left) which opposes the flange part 2 provided in the back side of the panel 35 is demonstrated. The locking pieces 28 a and 28 b of the mounting bracket 25 are inserted into the window holes 7 of 6 a and 6 b, and then the mounting bracket 25 is slid downward, and the base portions of the locking pieces 28 a and 28 b are inserted into the slit 8. At this time, the metal fitting mounting part 5 is held by the inner wall surfaces of the locking pieces 28a and 28b and the side edges of the side plates 27b. As a result, the mounting bracket 25 is mounted on the bracket mounting portion 5, and hence the flange portion 2, the side wall 27 a is positioned with a slight gap g (FIG. 7) from the back surface of the panel 35, and the liquid crystal display device 1 is mounted on the panel 35. Temporarily fixed.
In this way, by attaching the mounting brackets 25 to both sides of the flange portion 2 and temporarily fixing the liquid crystal display device 1, the liquid crystal display device 1 does not fall off even if the hand supporting the flange portion 2 is released from the front side. Held in that position.

  Next, the screws 31 inserted into the screw insertion holes 30 a and 30 b of the mounting bracket 25 are screwed into the screw holes 29 a and 29 b, respectively, and the screws 31 are tightened until the tip ends abut against the back surface of the panel 35. Accordingly, the panel 35 is held by the flange portion 2 of the liquid crystal display device 1 and the two screws 31, and the liquid crystal display device 1 is fixed to a predetermined position of the panel 35 and is securely attached. In this case, after attaching the flange part 2 to the panel 35 first, you may attach the main-body part 11 to the flange part 2 from the back side. In addition, the fixing means of the flange part 2 to the panel 35 by the mounting bracket 25 as described above is an example, and is not limited thereto. For example, the flange part 2 is fixed to the panel 35 with screws, etc. Other means may be used.

Next, a procedure for replacing the FL tubes 15a and 15b of the liquid crystal display device 1 attached to the panel 35 as described above will be described.
First, the external wiring connected to each connector 21a-21c is removed. Next, as shown in FIG. 8, with the liquid crystal display device 1 attached to the panel 35, the screws 24 that attach the main body portion 11 to the flange portion 2 are loosened from the back side of the panel 35, and the main body portion 11 is moved. Remove from flange part 2. Next, the connectors 18 of the FL pipes 15a and 15b connected to the control unit 20 are removed, and the hooks (not shown) provided in the openings 17a and 17b are released, and as shown in FIG. The FL tubes 15a and 15b accommodated in the portions 16a and 16b are pulled out from the openings 17a and 17b, and the new FL tubes 15a and 15b are inserted into the backlight accommodating portions 16a and 16b from the openings 17a and 17b. After locking and installing in a predetermined position, the connector 18 is connected to the control unit 20.
Then, when the main body case 12 of the main body portion 11 is fitted into the peripheral wall 4 of the flange portion 2 and positioned on the stud 9 and the main body case 12 is fixed to the stud 9 with the screws 24, the main body portion 11 again becomes the flange portion 2. To replace the FL pipes 15a and 15b.

  As described above, according to the present invention, the FL pipes 15a and 15b can be exchanged by simply removing the main body 11 from the flange 2 while the liquid crystal display device 1 is still attached to the panel 35. When replacing the tubes 15a and 15b, there is no need to consider the connection between the touch panel 13, the LCD 14 and the control unit 20, and the circuit of the printed circuit board is not exposed on the surface, so that the replacement work is very easy. Can be performed in a short time, and work efficiency can be greatly improved. Further, maintenance of the main body 11 and the like can be easily performed according to the above.

[Embodiment 2]
10 is a perspective view showing a state in which the liquid crystal display device according to Embodiment 2 of the present invention is attached to a panel and the main body is opened, and FIG. 11 is a perspective view of FIG. 10 viewed from the opposite side. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the present embodiment, the FL tubes 15a and 15b are inserted into and removed from the backlight accommodating portions 16a and 16b on the upper and lower sides or one of the LCD 14 provided on the main body 11 (for example, the drive unit 22 side). Openings 17a and 17b are provided, and the other side of the main body 11 is attached to the peripheral wall 4 of the flange 2 by a hinge 37 so as to be freely opened and closed.

  In the present embodiment configured as described above, when replacing the FL tubes 15a and 15b, first, the external wiring connected to the connectors 21a to 21c is removed. Next, with the liquid crystal display device 1 attached to the panel 35, the screw 24 (see FIG. 8) is loosened, and the main body portion 11 is rotated about the hinge portion 37 to be opened. Then, after replacing the FL pipes 15 a and 15 b, the main body 11 is rotated and closed, and fixed to the flange 2 with screws 24.

In the present embodiment, when the main body portion 11 is fixed to the flange portion, as in the case of the first embodiment, the screw 24 inserted into the screw insertion hole 23 provided in the main body case 12 is replaced with the stud 9 of the flange portion 2. For example, a locking portion or the like is provided on the free side of the main body portion 11 (opposite side of the hinge portion 37), and the flange portion is used by using this locking portion. You may make it fix to 2.
Further, in the present embodiment, since the relatively heavy main body 11 is opened and supported by the hinge 37, the flange 2 and the main body case 12 are made of a material having high rigidity. Is desirable.

In each of the above embodiments, although not shown in the drawings, a switch such as a limit switch is provided between the flange portion 2 and the main body portion 11 to replace the FL pipes 15a and 15b or perform maintenance. If the power is automatically turned off by this switch when the part 11 is removed from the flange part 2, the replacement and maintenance of the FL pipes 15a and 15b can be performed safely.
In the above description, the FL pipes 15a and 15b are inserted / removed from the openings 17a and 17b provided on the side of the LCD 14, but the upper and lower surfaces (or either one) of the LCD 14 are opened. The FL pipes 15a and 15b may be taken in and out from the opening.

1 is a perspective view of a liquid crystal display device according to Embodiment 1 of the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. FIG. 2 is an exploded perspective view of FIG. 1. It is a perspective view of the attachment metal fitting of FIG. It is a back perspective view which shows the state which attached the liquid crystal display device of FIG. 1 to the panel. It is a typical longitudinal cross-sectional view of FIG. It is explanatory drawing of the replacement | exchange procedure of FL pipe | tube of a liquid crystal display device. It is explanatory drawing of the replacement | exchange procedure of FL pipe | tube of a liquid crystal display device. It is a perspective view which shows the state which attached the liquid crystal display device which concerns on Embodiment 2 of this invention to the panel, and opened the main-body part. It is the perspective view which looked at FIG. 10 from the reflective side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device, 2 Flange part, 4 Perimeter wall, 5 Metal fitting part, 6a, 6b Locking part, 9 Stud, 10 Screw hole, 11 Main body part, 12 Main body case, 14 LCD, 15a, 15b FL tube (backlight ), 17a, 17b Opening, 20 Control, 21a-21c Connector, 23 Screw insertion hole, 24 Screw, 25 Mounting bracket, 28a, 28b Locking piece, 29a, 29b Screw hole, 35 Panel, 36 Panel cut, 37 Hinge part.

Claims (3)

A peripheral wall (4) provided with metal fittings (5, 5,...) That penetrates the panel cut (36) provided in the panel (35) and is locked to the back of the panel, and the panel cut. A first opening (2a) that passes from the front surface of the panel to the back surface, and a flange portion (2) that covers the panel cut edge;
Mounting members (25, 25,...) For fitting the panel (35) between the flange portions (2) by fitting the brackets and pressing the back of the panel with screws (31, 31...). When,
The touch panel (13) and LCD (14) that can be viewed or contacted from the front side of the panel (35) through the first opening (2a), and the control for controlling the touch panel (13) and LCD (14). A backlight housing portion (16a, 16b) for housing a portion (20), an FL tube (15a, 15b) for bringing the LCD (14) to an illuminance visible from the front surface of the panel (35), and the FL tube (15a, 15b) and a drive portion (22) for driving the stud (9, 9 ...) provided in the first opening (2a) toward the back side of the flange portion (2). A body case (12) which is detachably locked;
A liquid crystal display device comprising: Said 1st opening part (2a) has a hinge part (37, 37) which supports the one end part of said main body case (12) on the back side of said flange part (2), enabling free rotation. The liquid crystal display device according to claim 1. When the main body case (12) is detached from the first opening (2a), the backlight housing portions (16a, 16b) are electrically connected to the driving unit (22) by connectors (18, 18). 3. The liquid crystal display device according to claim 1, further comprising a second opening (17 a, 17 b) in which the FL pipe (15 a, 15 b) connected to the slidable member is detachably accommodated .

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