JP2015011040A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of suppressing the influence of an EMC(Electro-Magnetic Compatibility) noise generated from a substrate for liquid crystal as the drive circuit of a liquid crystal panel.SOLUTION: A liquid crystal display device includes: a front cabinet 21; a back cabinet 50 for covering the back face of the front cabinet; a panel module 30 placed such that the front side peripheral edge is brought into contact with the front cabinet; a substrate 32 for liquid crystal to be extracted from the end edge of the liquid crystal panel; and a substrate cover 26 made of electromagnetic wave shield materials to be attached to the front cabinet for covering the substrate for liquid crystal.

Description

  The present invention relates to a liquid crystal display device, and more specifically to countermeasures against noise generated from a liquid crystal substrate serving as a drive circuit for a liquid crystal panel.

  In a liquid crystal display device, an optical sheet such as a diffusion plate, an optical film, or a polarizing plate is laminated on the back surface of a liquid crystal panel, and images and the like are displayed by irradiating a backlight from the back side (for example, Patent Document 1). reference).

  In a liquid crystal display device, high frequency EMC (Electro-Magnetic Compatibility) noise is generated from a liquid crystal substrate which is a drive circuit thereof, which affects the operation of the liquid crystal panel and other electronic circuits in the liquid crystal display device.

  Therefore, in Patent Document 1, the back side of the liquid crystal panel is covered with a shield case made of a conductive material to reduce the influence of EMC noise.

JP 2011-209334 A

  As the size of the liquid crystal panel increases, the structure in which the liquid crystal panel is covered with the shield case as described above leads to an increase in weight and cost of the liquid crystal display device. In addition, a configuration for attaching the shield case is required separately, which leads to an increase in the number of parts.

  An object of the present invention is to provide a liquid crystal display device capable of suppressing the influence of EMC noise generated from a liquid crystal substrate which is a drive circuit of a liquid crystal panel.

The liquid crystal display device according to the present invention is
Front cabinet,
A back cabinet covering the back of the front cabinet;
A panel module placed so that the front peripheral edge abuts the front cabinet;
A substrate for liquid crystal drawn from an edge of the liquid crystal panel;
A substrate cover made of an electromagnetic shielding material that covers the liquid crystal substrate and is attached to the front cabinet;
With

According to the liquid crystal display device of the present invention, since the substrate cover covers the liquid crystal substrate, the EMC noise generated from the liquid crystal substrate can be blocked by the substrate cover made of an electromagnetic wave shielding material. The influence can be suppressed.
Further, since the board cover also serves as a member for mounting the panel module on the front cabinet, it is possible to reduce the number of parts.

FIG. 1 is an exploded perspective view of a liquid crystal display device according to the present invention as viewed from the back side. FIG. 2 is a perspective view seen from the back side of the liquid crystal display device. FIG. 3 is an exploded perspective view of the panel unit according to the embodiment. FIG. 4 is a perspective view showing a process of attaching the substrate cover to the panel unit. FIG. 5 is a perspective view of the panel unit as viewed from the back side. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is an exploded perspective view of the back cabinet as viewed from the front side. FIG. 8 is a perspective view showing a process of mounting the reflective panel on the back cabinet. FIG. 9 is a perspective view of a back cabinet equipped with a reflective panel.

  As an overall configuration, the liquid crystal display device (10) according to the present invention includes a front-side panel unit (20) and a back-side back cabinet (50) as shown in exploded perspective views 1 and 2 as seen from the back side. ).

  The panel unit (20) is configured by attaching a panel module (30) including a liquid crystal panel (31) and the like to the front cabinet (21). The panel module (30) includes a liquid crystal panel (31). A liquid crystal substrate (32) extends from the edge.

  As shown in FIGS. 1 and 4 to 6, the present invention is provided with a substrate cover (26) made of an electromagnetic wave shielding material covering a liquid crystal substrate (32). The substrate cover (26) is a panel. Part of the structure for fixing the module (30) to the front cabinet (21).

  Hereinafter, a liquid crystal display device (10) according to an embodiment of the present invention will be described in detail with reference to the drawings.

  In the liquid crystal display device (10) according to the present invention, after the panel unit (20) is assembled in a clean room in advance, the back cabinet (50) and the like can be assembled outside the clean room. Of course, it is not limited to this.

  As shown in FIG. 3, the panel unit (20) includes a front cabinet (21), a panel module (30) placed so that a front peripheral edge abuts the front cabinet (21), and a panel module (30). A middle frame (40) (40a) that covers at least a part of each side surface, a back frame (43) (43a) that is in contact with the peripheral edge on the back side of the panel module (30) and fixed to the front cabinet (21); With

  The front cabinet (21) is a frame in which a rectangular window (22) is formed, and a stepped portion (23) into which the panel module (30) is fitted is formed on the rear peripheral edge of the window (22). . In addition, a plurality of bottomed screw holes for screwing (70) (74) are provided on the periphery of the step portion (23), and a liquid crystal substrate (32 described later) is provided below the window (22). ) And a plurality of ribs (25) on which the substrate cover (26) can be mounted.

  The panel module (30) includes a liquid crystal panel (31) and one or more optical sheets (35) stacked on the back side of the liquid crystal panel (31). In addition to these, a protective sheet or the like may be attached or laminated.

  As shown in FIG. 6, a TCP (tape carrier package) tape (34) is led out from the edge of the liquid crystal panel (31). They are connected to a liquid crystal substrate (32) provided on the liquid crystal panel (31). As shown in FIGS. 3 and 4, the liquid crystal substrate (32) is electrically connected to the substrate (53) of the liquid crystal display device (10) through a central connector (33).

  The optical sheet (35) is a sheet having approximately the same size as the liquid crystal panel (31), and can be formed by laminating one or a plurality of diffusion plates, optical films, polarizing plates, and the like. The type and the number of laminated optical sheets (35) are not limited to these.

  As shown in FIG. 3, the panel unit (20) first places the front cabinet (21) so that the back face is upward, and the liquid crystal panel (31) is placed in the window (22) of the front cabinet (21). It arrange | positions so that a front surface periphery may contact | abut to the periphery. In the illustrated example, the liquid crystal panel (31) is disposed on the liquid crystal substrate (32) so as to be on the lower side when the liquid crystal display device (10) is installed so that its longitudinal direction is horizontal.

  Next, the middle frame (40) (40a) is disposed on the periphery of the liquid crystal panel (31). The middle frame (40) (40a) is a frame that covers each side surface of the liquid crystal panel (31), and preferably has a length that covers the entire length of each side surface as illustrated.

  The middle frame (40) (40a) is preferably made of metal in order to prevent the liquid crystal panel (31) from being affected by EMC (Electro-Magnetic Compatibility) noise. In the drawing, the middle frames (40) and (40a) have a length substantially equal to the length on each side of the liquid crystal panel (31). A rectangular frame connecting the frames (40) and (40a) can also be used.

  The middle frames (40) and (40a) cover the side surfaces of the liquid crystal panel (31) and the optical sheet (35) to be placed next to prevent contamination of dust and dirt, and the liquid crystal panel (31 ) To prevent the influence of the EMC noise described above.

  It is desirable that the middle frame (40) (40a) is provided with a spacer (41) projecting inwardly so as to have a substantially T-shaped cross section along the longitudinal direction. The spacer (41) is sandwiched between the back surface of the liquid crystal panel (31) and the optical sheet (35), thereby maintaining a predetermined distance between the liquid crystal panel (31) and the optical sheet (35). it can.

  After the middle frames (40) and (40a) are arranged on the periphery of the liquid crystal panel (31), the optical sheets (35) are sequentially stacked on the back side of the liquid crystal panel (31). In the case where the spacer portion (41) is provided in the middle frame (40) (40a), the optical sheet (35) close to the liquid crystal panel (31) comes into contact with the spacer portion (41).

  After placing the optical sheet (35), the back frames (43) and (43a) are arranged so as to abut on the peripheral edge of the rear surface of the optical sheet (35) on the rearmost surface. The back frame (43) (43a) can be L-shaped in cross section. The back frame (43) (43a) has a plurality of projecting pieces (44) projecting outward, each projecting piece (44) has a screw hole, and is screwed to the front cabinet (21) (74 ). In FIG. 3, hooks (45) projecting from the lower back frame (43) toward the back side are for holding the liquid crystal substrate (32).

  In order to prevent the influence of EMC noise on the liquid crystal panel (31) by the liquid crystal substrate (32), the liquid crystal substrate (32) is made of an electromagnetic wave shielding material as shown in FIGS. Covered by a cover (26). A metal can be exemplified as the electromagnetic wave shielding material, and the substrate cover (26) can be produced, for example, by sheet metal processing. By covering the liquid crystal substrate (32) with the substrate cover (26), the substrate cover (26) serves as a shield member that suppresses the influence of EMC noise.

  As shown in FIG. 6, the substrate cover (26) may have a U-shaped cross section with a bottomed groove. Further, the substrate cover (26) is formed such that one side wall (28) of the bottomed groove (27) is longer than the other side wall (29), and the front end of the side wall (28) is bent outward. Part (28a). A screw hole (28b) for fixing the substrate cover (26) to the front cabinet (21) is formed through the flange portion (28a). The front cabinet (21) has a bottomed screw hole (21a) at a position facing the screw hole (28b).

  The other side wall (29) of the substrate cover (26) is in contact with the middle frame (40). More preferably, the substrate cover (26) is fixed to the middle frame (40) by screwing or engagement. In the illustrated embodiment, the tip of the side wall (29) is also bent outward.

  Thus, the substrate cover (26) is attached to the panel unit (20) from the back side as shown in FIGS. More specifically, as shown in FIG. 6, the substrate cover (26) is arranged so that the liquid crystal substrate (32) and the rib (25) of the front cabinet (21) fit into the bottomed groove (27). The flange portion (28a) is in contact with the front cabinet (21), and the tip of the other side wall (29) is in contact with the middle frame (40).

  In this state, as shown in FIG. 6, the board cover (26) is attached to the front cabinet (21) by fastening the flange (28a) and the front cabinet (21) with screws (28c). At this time, since the middle frame (40) is pressed against the front cabinet (21) by the side wall (29) of the board cover (26), the board cover (26) is attached to the front cabinet (21) of the panel module (30). Part of the mounting structure.

  FIG. 5 is a perspective view of the panel unit (20) assembled as described above, as viewed from the back side. Since the assembly of the panel unit (20) is performed in a clean room, no dust or dirt is mixed between the liquid crystal panel (31) and the optical sheet (35) and between the optical sheets (35).

  The assembled panel unit (20) becomes a liquid crystal display device (10) by mounting the back cabinet (50). The subsequent assembly process can be performed outside the clean room. Of course, it can also be performed in a clean room.

  FIG. 7 is an exploded perspective view of the back cabinet 50 viewed from the front side. In addition, it demonstrates, referring also to the exploded perspective view which looked at the back cabinet (50) contained in FIG. 1 from the back side.

  As shown in FIG. 7, the back cabinet (50) has a concave shape on the back side, and is assembled to the panel unit (20) described above.

  As shown in FIG. 1, the back cabinet (50) has an opening (51) formed in the center of the back side, and a plate (53) mounted on the back side (51) is mounted on the opening (51). 54) is installed. The back cabinet (50) can be made of metal, for example, by press working, thereby increasing the strength of the housing. Moreover, heat dissipation efficiency can be improved by making the plate (54) also made of metal. The substrate (53) and the opening (51) are covered with a back cover (55) as shown in FIG.

  The bottom surface of the back cabinet (50) has a shape in which the left and right sides swell toward the back surface, and the speaker (14) is disposed therein as shown in FIG. As shown in FIG. 1, the back cabinet (50) has a plurality of audio output holes (52) on the lower surface facing the speaker (14).

  As shown in FIG. 7, a backlight (60) is arranged on the front side of the back cabinet (50). As the backlight (60), an LED (light emitting diode) (61) can be adopted. The LEDs (61) can be arranged at predetermined intervals on a plurality of bridges (62) suspended in the left-right direction of the back cabinet (50). The LED (61) is electrically connected to the substrate (53) to control light emission.

  As shown in FIGS. 8 and 9, the front side of the back cabinet (50) is covered with the reflective panel (63) so that the panel module (30) is efficiently irradiated with the light emitted from the LED (61). . The reflective panel (63) is white on the front side in order to increase the light reflection efficiency, and a plurality of LED holes (65) through which the LEDs (61) protrude are opened. The reflection panel (63) has a horizontal length that is substantially the same as the back cabinet (50), and the vertical length is equivalent to the amount of the speaker (14) and the like placed in the back cabinet (50). Shorter than the back cabinet (50).

  The reflection panel (63) is attached to the back cabinet (50) so that the LED (61) is exposed from the LED hole (65) (see FIGS. 8 and 9).

  At this time, as shown in FIG. 8, the panel holder (56) can be attached at a predetermined interval from the lower surface of the back cabinet (50) so that the reflective panel (63) can be mounted without bending. it can. When the back cabinet (50) is manufactured by press working, it is difficult to integrally form the panel holder (56) .Therefore, a plurality of bosses (57) are erected on the back cabinet (50), and the bosses ( It is desirable to attach a bowl-shaped panel holder (56) to 57).

  After mounting the reflective panel (63), it is preferable that a plurality of presser pins (58) are erected from above the reflective panel (63) so that the reflective panel (63) does not tilt to the front side. .

  The manufactured back cabinet (50) and panel unit (20) electrically connect the connector (33) of the liquid crystal substrate (32) of the panel unit (20) to the substrate (53). As shown in FIG. 2, the assembly of the liquid crystal display device (10) is completed by screwing the back cabinet (50) and the front cabinet (21) with screws (70) or the like. If necessary, the stand (12) can be screwed (72) to the lower surface of the back cabinet (50).

  According to the present invention, the influence of EMC noise from the liquid crystal substrate (32) can be suppressed by the substrate cover (26). Also, since the board cover (26) forms part of the mounting structure for mounting the panel module (30) to the front cabinet (21), it is possible to reduce the number of parts when the panel unit (20) is assembled. it can.

  In the liquid crystal display device (10) described in the above embodiment, only the assembly of the panel unit (20) is performed in a clean room, and other processes can be performed outside the clean room. As a result, the assemblability can be improved. Therefore, application to a large liquid crystal display device (10) having a size of 39 inches or more is particularly suitable.

  Further, since the liquid crystal panel (31) and the like are unitized, it is not necessary to disassemble the panel unit (20) during maintenance such as replacement of the backlight (60). Accordingly, there is an advantage that the maintenance does not need to be returned to the clean room and can be performed at the installation location.

  The above description is for explaining the present invention, and should not be construed as limiting the invention described in the claims or limiting the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims.

  For example, the shape of the substrate cover (26) is not limited to the above. Further, the substrate cover (26) is not limited to the one made by sheet metal processing as long as it is an electromagnetic wave shielding material, and may be one in which the surface of the resin is subjected to metal plating or the like.

  The configuration of the panel module (30) is not limited to the above. For example, the optical sheet (35) in the above-mentioned embodiment has a tongue piece having through holes formed at one or a plurality of positions on the end edge, and the middle frame (40) (40a) or the back frame (43) (43a ), The optical sheet (35) can be easily positioned when the panel unit (20) is assembled.

(10) Liquid crystal display device
(20) Panel unit
(21) Front cabinet
(26) Board cover
(30) Panel module
(31) LCD panel
(32) LCD substrate
(50) Back cabinet

Claims (4)

Front cabinet,
A back cabinet covering the back of the front cabinet;
A panel module placed so that the front peripheral edge abuts the front cabinet;
A liquid crystal substrate drawn out from an edge of the panel module;
A substrate cover made of an electromagnetic shielding material that covers the liquid crystal substrate and is attached to the front cabinet;
A liquid crystal display device comprising: The substrate cover is formed with a bottomed groove,
The substrate cover is fitted to the liquid crystal substrate from the back side with the bottomed groove,
The liquid crystal display device according to claim 1. The substrate cover is formed such that one of the side walls of the bottomed groove is longer than the other, and the front end of the side wall formed long has an outward flange portion,
The flange portion is screwed to the front cabinet.
The liquid crystal display device according to claim 2. The panel module is
LCD panel,
One or more optical sheets laminated on the back side of the liquid crystal panel;
A middle frame covering at least a part of each side surface of the liquid crystal panel and the optical sheet;
A back frame that abuts on the back side periphery of the optical sheet and is fixed to the front cabinet;
Contains
The substrate cover is attached to the middle frame;
The liquid crystal display device according to claim 1.

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