JP2012156912A - Liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display capable of improving a fitting strength of sheet metal component for failure countermeasure and preventing degradation in strength of the sheet metal component, by preventing electrostatic discharge failure which is easy to occur on a remote controller light-receiving part, an illuminance sensor part, and an LED light emitting part provided to a printed wiring board on the rear face of a picture frame part of a front cabinet.SOLUTION: A printed wiring board 5 attached with a sheet metal component 9 for preventing electrostatic discharge failure that is easy to occur at a remote controller light receiving part 6, an illuminance sensor part 7, and an LED light emitting part 8, is provided on the rear face of a picture frame 1a of a front cabinet 1. Insert pieces 9g and 9i formed at a side plate part 9b at both ends in length direction of the sheet metal component 9 and a side plate part 9c at one end in width direction, are inserted into a slit hole 5b formed at the printed wiring board 5 for fitting. A slot-type opening part 9k in which a wiring board supporting rib 1b on the rear face of the picture frame 1a is fitted, is formed from a covered plate part 9a of the sheet metal component 9 over to the insert piece 9i of the side plate part 9c at one end in width direction.

Description

  The present invention relates to a liquid crystal display device such as a liquid crystal television. More specifically, the present invention relates to an electrostatic discharge failure that is likely to occur in a remote control light-receiving unit, an illuminance sensor unit, an LED light-emitting unit, etc. The present invention relates to a liquid crystal display device improved so as to be prevented.

  In recent years, liquid crystal display devices such as LCD TVs with narrow and thin frames have a strip-like printed wiring board (sensor board) attached to the back of the frame part of the front cabinet. In general, the LED mounting unit and the LED light emitting unit are mounted. However, such a liquid crystal display device has a problem that an electrostatic discharge failure easily occurs in a remote control light receiving unit, an illuminance sensor unit, an LED light emitting unit, and the like in an ESD test.

  Therefore, the present inventor tried to attach a countermeasure component for preventing electrostatic discharge failure to a printed wiring board, but it is necessary to use a small countermeasure component on a strip-shaped substrate having a small printed wiring board. Therefore, it is difficult to mount and fix the countermeasure parts with sufficient fixing strength. Therefore, when the printed wiring board is passed through the solder dip bath, the countermeasure parts may float and interfere with other parts. found. In addition, since the rib that supports the printed wiring board is formed on the back of the frame part of the front cabinet, it is necessary to form a cut groove to avoid the wiring board support rib in the countermeasure component. It has also been found that there is a disadvantage that the strength of the parts for use is reduced.

On the other hand, a remote control sensor is known in which arm portions are provided on both sides of the shield case, and the tip of the arm portion of the shield case is bent inward in a recess formed in the contour of the circuit board, and the shield case is attached to the circuit board. (Patent Document 1).
Also known are an electric device (Patent Document 2) in which the light receiving unit is covered with a shield case, and a liquid crystal television (Patent Document 3) in which a sensor substrate is attached to the back surface of the frame portion of the cabinet.

  However, in the technical contents of these Patent Documents 1 to 3, the above-described inconveniences when attaching small parts for countermeasures against electrostatic discharge to the small band-like printed wiring board (sensor board) on the back of the frame portion of the front cabinet are eliminated. It is difficult to do.

JP 2003-037276 A JP 2002-151706 A JP 2008-078745 A

The present invention has been made under the above circumstances, and a first problem to be solved is a remote control light receiving unit, an illuminance sensor unit, and an LED light emitting unit provided on a printed wiring board on the back of the frame portion of the front cabinet. It is an object of the present invention to provide a liquid crystal display device that can prevent electrostatic discharge failures that are likely to occur.
A second problem to be solved by the present invention is that a sheet metal part for countermeasures against troubles can be attached and fixed to a printed wiring board with sufficient fixing strength, and the strength of the sheet metal part is not lowered. An object of the present invention is to provide a liquid crystal display device in which the shape of a sheet metal part is devised.

  In order to solve the first problem, in the liquid crystal display device according to claim 1 of the present invention, a printed wiring board including at least a remote control light receiving portion, an illuminance sensor portion, and an LED light emitting portion is attached to the back surface of the frame portion of the front cabinet. In the liquid crystal display device, a sheet metal part for preventing an electrostatic discharge failure that is likely to occur in the remote control light receiving unit, the illuminance sensor unit, and the LED light emitting unit is attached to the printed wiring board.

  In order to solve the second problem, according to a second aspect of the present invention, in the liquid crystal display device of the first aspect, the side plate portions at both ends in the length direction and the side plate portions at one end in the width direction of the sheet metal part are provided. Insertion pieces are formed, and these insertion pieces are inserted into slit holes of the printed wiring board, and the invention according to claim 3 of the present invention is formed on the back surface of the frame portion of the front cabinet. The groove-shaped opening into which the wiring board supporting rib is fitted is formed from the covering plate portion of the sheet metal part to the insertion piece of the side plate portion at one end in the width direction of the sheet metal member. The invention according to claim 4 is characterized in that a retaining portion is formed on the insertion piece.

  In the liquid crystal display device according to claim 1 of the present invention, a sheet metal part for preventing an electrostatic discharge failure that is likely to occur in the remote control light receiving unit, the illuminance sensor unit, and the LED light emitting unit is attached to the printed wiring board. Parts can prevent electrostatic discharge failures.

  And like the invention which concerns on Claim 2 of this invention, an insertion piece is formed in the side plate part of the length direction both ends of sheet metal parts, and the side plate part of the width direction one end, These insertion pieces are slit holes of a printed wiring board. When the sheet metal part is mounted and fixed in place, the sheet metal part is attached and fixed to the printed wiring board on its three sides. Therefore, the fixing stability and fixing strength of the sheet metal part are improved, and the printed wiring board is soldered. The concern that the sheet metal part floats and interferes with other parts when passed through the tank can be eliminated.

  Further, as in the invention according to claim 3 of the present invention, the groove-shaped opening into which the wiring board support rib formed on the back surface of the frame portion of the front cabinet is fitted is changed from the covering plate portion of the sheet metal part to the width of the sheet metal member. When formed over the insertion piece of the side plate part at one end in the direction, the sheet metal part is not divided at one end of the cut groove as in the case of providing the above-mentioned cut groove, and the sheet metal part is formed at both ends of the groove-shaped opening. Since they are connected, it is possible to eliminate the concern of causing a substantial decrease in strength of the sheet metal part.

  Further, as in the invention according to claim 4 of the present invention, when the retaining portion is formed in the insertion piece of the sheet metal part, when the printed wiring board having the sheet metal part attached and fixed is passed through the solder dip tank, the sheet metal part is The lifting of the part can be prevented by the retaining portion, and the possibility that the sheet metal part interferes with other parts can be eliminated.

It is principal part sectional drawing of the liquid crystal display device which concerns on one Embodiment of this invention. It is a principal part perspective view of the liquid crystal display device. It is a fragmentary perspective view of the printed wiring board which attached the sheet-metal component. It is the perspective view which isolate | separated the printed wiring board and the sheet metal part.

  Exemplary embodiments of a liquid crystal display device according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a liquid crystal television having a narrow frame and a thin design, which is a typical example of the liquid crystal display device according to the present invention. 1 (1a) is a frame of the front cabinet (frame along the lower side), and 2 is a front cabinet. 1. A rear cabinet removably joined to 1, 3 is a liquid crystal module attached to the front opening of the front cabinet 1 (opening surrounded by a frame), 4 is a main board attached to the back of the liquid crystal module 3, Reference numeral 5 denotes a small belt-like printed wiring board (hereinafter referred to as a sensor board) attached to the back surface of the frame 1a along the lower side of the front cabinet 1.

  The liquid crystal module 3 houses a backlight unit (not shown) inside the frame 3a, and a liquid crystal panel 3b is placed on the front side of the backlight unit via an optical sheet (not shown) such as a light diffusion sheet. The backlight unit is a direct light type in which a linear light source such as a cold cathode tube is disposed behind the liquid crystal panel 3b, or a point light source such as an LED or a cold cathode on the end face of the light guide plate. An edge light type having a linear light source such as a tube is preferably used.

  As shown in FIGS. 3 and 4, at least a remote control light receiving unit 6, an illuminance sensor unit 7, and an LED light emitting unit 8 are provided on the front surface of the sensor substrate 5 to prevent electrostatic discharge failures that are likely to occur at these points. A sheet metal part 9 is attached. As shown in FIG. 1, the connector 5 a of the sensor substrate 5 and the connector 4 a of the main substrate 4 on the back surface of the liquid crystal module 3 are connected by a cable 10.

  As shown in FIGS. 3 and 4, the sheet metal part 9 for preventing the electrostatic discharge failure includes a substantially rectangular covering plate portion 9a, side plate portions 9b and 9b formed at both ends in the length direction, and one end in the width direction. It is provided with a side plate portion 9c formed and a side plate portion 9d partially formed at the other end in the width direction. The cover plate portion 9a is provided to avoid the remote control light receiving portion 6 and the illuminance sensor portion 7, respectively. In order to avoid the recessed portions 9e and 9e and the LED light emitting portion 8, a hole portion 9f is formed. Therefore, there is no concern that the functions of the remote control light receiving unit 6, the illuminance sensor unit 7, and the LED light emitting unit 8 are hindered by the cover plate 9a.

  As shown in FIG. 4, insertion pieces 9g and 9g are projected from the side plate portions 9b and 9b at both ends in the length direction of the sheet metal part 9, and a "<" shape is formed at the intermediate portion of each insertion piece 9g. A bent retaining portion 9h is formed. Further, a pair of stepped insertion pieces 9i, 9i are projected from the side plate portion 9c at one end in the lengthwise direction of the sheet metal part 9, and these insertion pieces 9i, 9i are cut out from cut-and-raised pieces. A stopper 9j is formed.

  As shown in FIG. 4, the sensor board 5 has four slit holes 5b corresponding to the insertion pieces 9g, 9g, 9i, 9i, and the insertion pieces 9g are formed in these slit holes 5b. , 9g, 9i, 9i are attached to the sensor board 5 by inserting the sheet metal parts 9 therein. Thus, since the sheet metal part 9 is attached and fixed to the sensor substrate 5 on its three sides, the sheet metal part 9 has good fixing stability and high fixing strength, and the retaining portions 9h and 9j have slit holes 5b. In order to prevent the insertion pieces 9g, 9g, 9i, 9i from slipping out by engaging with the edge of the sheet metal component 9 floats from the sensor substrate 5 when the sensor substrate 5 is passed through the solder dip tank, and other components. The possibility of interference can be eliminated.

  On the back surface of the frame 1 a along the lower side of the front cabinet 1, as shown in FIG. 2, a pair of substrate support ribs 1 b and 1 b that support the front surface of the sensor substrate 5, and a holding protrusion that holds one side edge of the sensor substrate 5 1c (see FIG. 1) is formed, and the substrate support ribs 1b and 1b also serve as a partition member that partitions the remote control light receiving unit 6, the LED light emitting unit 8, and the illuminance sensor unit 7. When such substrate support ribs 1b and 1b are present, it is necessary to prevent the substrate support ribs 1b and 1b from coming into contact with the sheet metal part 9. In this case, the width from the covering plate portion 9a of the sheet metal part 9 is reduced. If a cut groove into which the substrate support rib 1b is fitted is provided over the side plate portion 9c at one end in the direction, the sheet metal component 9 is divided at one end of the cut groove, so that the strength of the sheet metal component 9 is greatly reduced. The inconvenience arises. Therefore, in this embodiment, as shown in FIGS. 3, 4, and 5, the board supporting rib 1 b extends from the covering plate portion 9 a of the sheet metal part 9 to the insertion pieces 9 i and 9 i of the side plate portion 9 c at one end in the width direction. , 1b are formed in the closed groove-shaped openings 9k, 9k at both ends so that the sheet metal member 9 is connected without being divided at both ends of the groove-shaped openings 9k, 9k. Prevents strength reduction.

  As shown in FIG. 1, the small strip-shaped sensor substrate 5 to which the sheet metal part 9 is attached as described above is disposed on the back surface of the frame 1a along the lower side of the front cabinet 1 with the sheet metal member 9 facing forward. While being held by 1c and being supported from the front side by a substrate support rib (not shown in FIG. 1), it is screwed and attached. In such a mounted state, the remote control light-receiving unit 6, the LED light-emitting unit 8, and the illumination sensor unit 7 all face the holes formed in the frame 1a of the front cabinet 1, so that the respective functions can be exhibited. .

As can be understood from the above description, the liquid crystal television can sufficiently prevent the electrostatic discharge failure that is likely to occur in the remote control light-receiving unit 6, the illuminance sensor unit 7, and the LED light-emitting unit 8 by the sheet metal part 9. The insertion pieces 9g, 9i formed on the side plate portions 9b, 9b at both ends in the length direction of the sheet metal component 9 and the side plate portion 9c at one end in the width direction are inserted into the slit holes 5b of the sensor substrate 5, and at the three sides of the sheet metal component 9 Since the fixing parts 9h and 9j are formed on the insertion pieces 9g and 9i, the fixing stability and strength of the sheet metal part 9 are improved, and the sheet metal part 9 is fixed when the sensor board 5 is soldered. There is no need to worry about floating and interfering with other parts.
Further, the closed groove-shaped openings 9k at both ends into which the wiring board support ribs 1b formed on the back surface of the frame portion 1a of the front cabinet 1 are fitted from the covering plate portion 9a of the sheet metal component 9 to the width direction of the sheet metal component. Since the sheet metal part 9 is not divided by being formed over the insertion piece 9i of the side plate part 9c at one end, the substantial strength reduction of the sheet metal part 9 can be eliminated.

1 Front cabinet 1a Frame along the lower side of the front cabinet 5 Printed wiring board (sensor board)
5b Slit hole 6 Remote control light receiving part 7 Illuminance sensor part 8 LED light emitting part 9 Sheet metal part 9a Cover plate part 9b Side plate part at both ends in length direction of sheet metal part 9c Side plate part at one end of sheet metal part in width direction 9g, 9i Insert piece 9h, 9j retaining part 9k channel opening

Claims (4)

  In a liquid crystal display device in which a printed wiring board having at least a remote control light receiving portion, an illuminance sensor portion, and an LED light emitting portion is attached to the back surface of the frame portion of the front cabinet, the remote control light receiving portion, the illuminance sensor portion and the LED light emitting portion are likely to occur A liquid crystal display device, wherein a sheet metal part for preventing an electrostatic discharge failure is attached to a printed wiring board.   The insertion piece is formed in the side plate part of the length direction both ends of a sheet-metal component, and the side plate part of the width direction one end, These insertion pieces are inserted in the slit hole of the printed wiring board, It is characterized by the above-mentioned. The liquid crystal display device described.   A groove-shaped opening for fitting a wiring board support rib formed on the back surface of the frame portion of the front cabinet is formed from the covering plate portion of the sheet metal component to the insertion piece of the side plate portion at one end in the width direction of the sheet metal component. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device.   The liquid crystal display device according to claim 2, wherein a retaining portion is formed on the insertion piece.

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