JP2011033909A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device which prevents dust from intruding into the back surface of a liquid crystal display panel through between the liquid crystal display panel and a frame for mounting the liquid crystal display panel. <P>SOLUTION: The liquid crystal display device includes the liquid crystal display panel and the frame for mounting the liquid crystal display panel. The liquid crystal display panel includes a first rubber cushion fixed so as to surround a display area on the outer side of the display area, and the frame includes a second rubber cushion fixed so as to surround the display area of the liquid crystal display panel mounted on the frame. The liquid crystal display panel is mounted on the frame through the first rubber cushion and the second rubber cushion, and the first rubber cushion and the second rubber cushion are disposed adjacently without overlapping in the planar view. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device including a frame on which a liquid crystal display panel is placed.

  The liquid crystal display panel is composed of a pair of opposed glass substrates sandwiching liquid crystal as an envelope, and is very easily damaged. For this reason, a liquid crystal display device is usually configured with a frame that protects the liquid crystal display panel from external injury.

  In addition, since the liquid crystal display panel is configured to control the light transmittance of the pixels, it is usually provided with a backlight on the back, and the frame is used to modularize the liquid crystal display panel and the backlight. Composed.

  Therefore, the frame in the liquid crystal display device includes a lower frame in which the backlight is disposed, a middle frame disposed between the backlight and the liquid crystal display panel, and an upper portion that covers the liquid crystal display panel with the display area exposed. The lower frame, the middle frame, and the upper frame are locked with each other after the backlight and the liquid crystal display panel are stored. A liquid crystal display device having such a configuration is disclosed in, for example, Patent Document 1 below.

  The liquid crystal display device disclosed in Patent Document 1 is, as shown in FIG. 8 schematically drawn, the liquid crystal display panel PNL is placed in the middle frame MFR via a rubber cushion GC fixed to the middle frame MFR. It is comprised so that it may be mounted. In this case, the rubber cushion GC is arranged along the periphery of the liquid crystal display panel PNL so as to substantially surround the display area AR. For this reason, in Patent Document 1, dust (dust) enters the back surface of the liquid crystal display panel PNL through the rubber cushion GC between the liquid crystal display panel PNL and the middle frame MFR on which the liquid crystal display panel PNL is placed. There is a statement that it can be prevented.

  FIG. 8 is a diagram corresponding to FIG. 1 showing the embodiment of the present invention, and for the detailed configuration other than the configuration described above, refer to the description in FIG.

JP 2008-191607 A

  However, in the configuration shown in FIG. 8, the liquid crystal display panel PNL is only sandwiched between the middle frame MFR and the upper frame UFR, and is in a state where mechanical fixation to the middle frame MFR is avoided. It is placed in. The reason is as follows. The liquid crystal display panel PNL has an initial warp because the polarizing plates POL1 and POL2 are attached to the respective surfaces of the pair of glass substrates SUB1 and SUB2 sandwiching the liquid crystal. For this reason, for example, a larger warp occurs due to heat of the backlight BL or the like. In this case, if the liquid crystal display panel PNL is mechanically fixed by the middle frame MFR, stress occurs in the liquid crystal display panel PNL due to warping. When the liquid crystal display panel PNL is displaying black, for example, there is a disadvantage that the phenomenon that the black luminance increases due to the stress is observed.

  For this reason, even if the liquid crystal display panel PNL is configured to be placed on the rubber cushion GC of the middle frame MFR, a gap is easily formed between the liquid crystal display panel PNL and the rubber cushion GC. As indicated by the arrows, it is inevitable that dust enters the back surface of the liquid crystal display panel PNL through the gap.

  An object of the present invention is to provide a liquid crystal display device that can reliably prevent dust (foreign matter) from entering the back of the liquid crystal display panel through the liquid crystal display panel and a frame on which the liquid crystal display panel is placed. Is to provide.

  The configuration of the present invention can be as follows, for example.

(1) A liquid crystal display device of the present invention is a liquid crystal display device comprising a liquid crystal display panel and a frame on which the liquid crystal display panel is placed,
The liquid crystal display panel includes a first rubber cushion fixed so as to surround the display area outside the display area,
The frame includes a second rubber cushion fixed so as to surround a display area of the liquid crystal display panel placed on the frame,
The liquid crystal display panel is placed on the frame via the first rubber cushion and the second rubber cushion,
The first rubber cushion and the second rubber cushion are arranged adjacent to each other without overlapping when viewed in a plan view.

(2) The liquid crystal display device according to the present invention is the liquid crystal display device according to (1), wherein a lower frame in which a backlight is disposed, a middle frame disposed between the backlight and the liquid crystal display panel, and the liquid crystal display panel An upper frame arranged to expose the display area,
The frame on which the liquid crystal display panel is placed is the middle frame.

(3) In the liquid crystal display device of the present invention, in (1), each of the first rubber cushion and the second rubber cushion includes a plurality of linear rubber cushions arranged in the circumferential direction of the display area of the liquid crystal display panel. It is characterized by being configured.

(4) In the liquid crystal display device of the present invention, in any one of (1) to (3), each of the first rubber cushion and the second rubber cushion is made of silicon rubber. .

(5) The liquid crystal display device of the present invention is a liquid crystal display device comprising a liquid crystal display panel and a frame on which the liquid crystal display panel is placed,
The liquid crystal display panel includes a first cushion fixed so as to surround the display area outside the display area,
The frame includes a second cushion fixed so as to surround a display area of the liquid crystal display panel placed on the frame,
The liquid crystal display panel is placed on the frame via the first cushion and the second cushion,
The first cushion and the second cushion are composed of a member in which one cushion is softer than the other cushion,
The first cushion and the second cushion are arranged so as to partially overlap each other in a plan view.

(6) The liquid crystal display device according to the present invention is the liquid crystal display device according to (5), wherein a lower frame in which a backlight is disposed, a middle frame disposed between the backlight and the liquid crystal display panel, and the liquid crystal display panel An upper frame arranged to expose the display area,
The frame on which the liquid crystal display panel is placed is the middle frame.

(7) In the liquid crystal display device of the present invention, in (5), each of the first cushion and the second cushion has a plurality of linear cushions juxtaposed in the circumferential direction of the display area of the liquid crystal display panel. It is configured.

(8) In the liquid crystal display device of the present invention, in any one of (5) to (7), one of the first cushion and the second cushion is made of silicon rubber, and the other is made of sponge. It is characterized by being.

(9) In the liquid crystal display device according to any one of (5) to (8), the width of the one cushion is larger than the width of the other cushion, and the other cushion is seen in plan view. The entire region is arranged so as to overlap with the one cushion.

  The above-described configuration is merely an example, and the present invention can be modified as appropriate without departing from the technical idea. Further, examples of the configuration of the present invention other than the above-described configuration will be clarified from the entire description of the present specification or the drawings.

  The liquid crystal display device thus configured reliably prevents dust (foreign matter) from entering the back of the liquid crystal display panel through the liquid crystal display panel and the frame on which the liquid crystal display panel is placed. become able to.

  Other effects of the present invention will become apparent from the description of the entire specification.

It is the figure which expanded and showed the dotted-line frame (alpha) of FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic sectional drawing which showed the whole Example 1 of the liquid crystal display device of this invention. It is the top view which showed the liquid crystal display panel shown in Example 1 of this invention. It is the top view which showed the middle frame shown in Example 1 of this invention. It is a figure explaining the positional relationship of the liquid crystal display panel shown in Example 1 of this invention, and the 1st rubber cushion formed in a middle frame. It is sectional drawing which showed Example 3 of the liquid crystal display device of this invention. It is sectional drawing which showed Example 4 of the liquid crystal display device of this invention. It is sectional drawing which showed the example of the conventional liquid crystal display device.

  Embodiments of the present invention will be described with reference to the drawings. In each drawing and each example, the same or similar components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 2 is a view showing a cross section of the first embodiment of the liquid crystal display device of the present invention.

In FIG. 2, first, there is a lower frame DFR, and a backlight BL is arranged in the lower frame DFR. The lower frame DFR is made of stainless steel, for example, and has a box shape that can accommodate the backlight BL. The backlight BL includes a light guide plate CLB, a cold cathode ray tube LT disposed on the side wall surface of the light guide plate CLB, and a reflection plate REB that guides light from the cold cathode ray tube LT to the side wall surface side of the light guide plate CLB. And a reflective sheet RES disposed on the back surface of the light guide plate CLB. The backlight BL configured as described above functions as a surface light source in which light from the cold cathode ray tube LT is emitted from a surface (indicated by reference sign SF) in the light guide plate CLB facing a liquid crystal display panel PNL described later. become. Further, an optical sheet OPS such as a prism sheet is disposed on the surface SF of the light guide plate CLB, and a viewing angle of light emitted from the light guide plate CLB is set by the optical sheet OPS, for example.

  The middle frame MFR is disposed on the lower frame DFR while being locked to the lower frame DFR. The middle frame MFR is made of a resin, for example, and is formed as a frame having an opening OP in the center excluding the periphery. The opening OP of the middle frame MFR is provided to guide light from the backlight BL to a liquid crystal display panel PNL described later. The periphery of the opening OP of the middle frame MFR is formed so as to overlap the periphery of the optical sheet OPS, and the optical sheet OPS can be disposed in close contact with the backlight BOL side by this peripheral portion. A liquid crystal display panel PNL is arranged in the middle frame MFR. The liquid crystal display panel PNL is arranged so that the periphery thereof faces the periphery of the opening OP of the middle frame MFR, so that the display area AR of the liquid crystal display panel PNL is positioned on the opening OP of the middle frame MFR. It has become.

  The liquid crystal display panel PNL is formed by using, for example, glass substrates SUB1 and SUB2, which are arranged to face each other with a liquid crystal (not shown) interposed therebetween, and displays a central portion excluding the periphery when viewed in a plan view. The area AR is configured (see FIG. 3). A large number of pixels arranged in a matrix are formed on the liquid crystal side surface of the substrates SUB1 and SUB2 in the display area AR. Further, polarizing plates POL1 and POL2 are disposed on the surfaces of the substrates SUB1 and SUB2 opposite to the liquid crystal so as to cover at least the display area AR.

  In the first embodiment, the liquid crystal display panel PNL is configured to be placed on the middle frame MFR via the first rubber cushion GC1 and the second rubber cushion GC2 outside the display area AR. Yes. Details of the first rubber cushion GC1 and the second rubber cushion GC2 will be described later with reference to FIG.

  Further, the upper frame UFR is disposed on the middle frame MFR while being locked to the middle frame MFR. The upper frame UFL is made of stainless steel, for example, and is provided with a window (opening) WD that exposes the display area AR of the liquid crystal display panel PNL. A rubber cushion GC is fixed to the surface on the liquid crystal display panel PNL side around the window WD of the upper frame UFR. The rubber cushion GC is formed so as to be in contact with the liquid crystal display panel PNL, and the liquid crystal display panel PNL can be disposed in close contact with the middle frame MFR side.

  FIG. 1 is an enlarged view of the inside of the dotted frame α in FIG. In FIG. 1, a first rubber cushion GC1 made of, for example, silicon rubber is fixed to the surface on which the liquid crystal display panel PNL of the middle frame MFR is placed. The first rubber cushion GC1 is formed so as to surround the display area AR of the liquid crystal display panel PNL, as will be apparent later.

  The liquid crystal display panel PNL is formed with a second rubber cushion GC2 made of, for example, silicon rubber fixed to a surface facing the middle frame MFR around the liquid crystal display panel PNL. The second rubber cushion GC2 is formed so as to surround the display area AR of the liquid crystal display panel PNL, as will be apparent later. In this case, the first rubber cushion GC1 may have a height equal to the height of the second rubber cushion GC2, or may have a slight height difference from the second rubber cushion GC2. In either case, the liquid crystal display panel PNL is placed on the middle frame MFR via at least one of the first rubber cushion GC1 and the second rubber cushion GC2.

  In the case of the first embodiment, the first rubber cushion GC1 and the second rubber cushion GC2 are arranged adjacent to each other without overlapping each other. That is, FIG. 3 shows a plan view of the liquid crystal display panel PNL as viewed from the observation side surface (surface opposite to the backlight BL). On the surface of the observer of the liquid crystal display panel PNL, a polarizing plate POL2 is arranged in the display area AR in the center portion excluding the periphery of the envelope made of the substrates SUB1 and SUB2. Around the back surface of the liquid crystal display panel PNL, a second rubber cushion GC2 composed of, for example, four rubber cushions (indicated by GC2a, GC2b, GC2c, and GC2d in the drawing) is fixed. Each of the rubber cushions GC2a, GC2b, GC2c, and GC2d is arranged to be positioned outside each side of the display area AR, and has a separation portion of a slight distance at the corner of the display area AR, but surrounds the display area AR. It is firmly fixed. FIG. 4 is a plan view of the middle frame MFR as viewed from the mounting surface of the liquid crystal display panel PNL. The middle frame MFR is configured as a frame having an opening OP in the central portion excluding the periphery thereof. A first rubber cushion GC1 composed of, for example, four rubber cushions (indicated by GC1a, GC1b, GC1c, and GC1d in the figure) having a linear shape is fixed around the opening OP of the middle frame FR. The rubber cushions GC1a, GC1b, GC1c, and GC1d are positioned and arranged outside each side of the display area AR of the liquid crystal display panel PNL (shown by a dotted line in the figure) placed on the middle frame MFR. The corner portion has a separation portion at a slight distance, but is fixed so as to surround the display area AR. In this case, FIG. 5 is a diagram showing a location where the first rubber cushion GC1 is disposed with respect to the liquid crystal display panel PNL placed on the middle frame MFR. As is apparent from FIG. 5, the second rubber cushion GC2 is arranged adjacent to the first rubber cushion GC1 of the liquid crystal display panel PNL without overlapping.

  In the case of such a configuration, as shown in FIG. 1, when a gap (indicated by the symbol GPi in the figure) is generated between the liquid crystal display panel PNL and the first rubber cushion GC1, this gap GPi is separated from the rubber cushion GC1. It will be connected to the gap (indicated by the symbol GPm in the figure) between the second rubber cushion GC2. Even if a gap (indicated by the symbol JPo in the figure) is generated between the middle frame MFR and the second rubber cushion GC2, continuous gaps GPi, GPm, GPo reaching the back side of the liquid crystal display panel PNL. Is formed with a gap GPm and a gap GPm serving as a path bent with respect to the gap GPo interposed therebetween. This means that it is extremely difficult for dust that has passed through the gap GPi to enter the gap GPo due to the presence of the gap GPm. Accordingly, even when the liquid crystal display panel PNL is not mechanically fixed to the middle frame MFR, it is possible to make it difficult for dust to pass between the middle frame MFR and the liquid crystal display panel PNL. When warpage occurs in the liquid crystal display panel PNL, normally, the gap GPi between the liquid crystal display panel PNL and the first rubber cushion GC1 and the gap JPo between the middle frame MFR and the second rubber cushion GC2 are generated at the same time. Rarely, a continuous gap reaching the back side of the liquid crystal display panel PNL is unlikely to occur.

  In the first embodiment, in plan view, the second rubber cushion GC2 provided on the liquid crystal display panel PNL side is arranged on the inner side of the first rubber cushion GC1 provided on the middle frame MFR side. is there. However, the present invention is not limited to this, and the first rubber cushion GC1 provided on the middle frame MFR side may be arranged on the inner side of the second rubber cushion GC2 provided on the liquid crystal display panel PNL side. Furthermore, the plurality of rubber cushions constituting the second rubber cushion GC2 are each arbitrarily arranged inside or outside the plurality of rubber cushions constituting the first rubber cushion GC2 and adjacent rubber cushions. It may be.

  FIG. 6 is a block diagram showing Embodiment 3 of the liquid crystal display device of the present invention, which is drawn in association with FIG.

  In FIG. 6, different configurations from FIG. 1 are first a first cushion CSH1 fixed to the middle frame MFR and a second cushion CSH2 fixed to the liquid crystal display panel PNL. The second cushion CSH2 is made of, for example, silicon rubber, and the first cushion CSH1 is made of a softer member than the second cushion CSH2, and is made of, for example, a sponge. The first cushion CSH1 is formed to have a relatively large width with respect to the second cushion CSH2, and the first cushion CSH1 and the second cushion CSH2 overlap the second cushion CSH1 in the middle of the width direction of the first cushion CSH2. It is arranged in the positional relationship arranged as described above. That is, as viewed in a plan view, the entire area of the second cushion CSH2 is disposed so as to overlap the first cushion CSH1. In this case, as shown in FIG. 6, the first cushion CSH1 is deformed so that the second cushion CSH2 is embedded in the first cushion CSH1. This is because, as described above, the first cushion CSH1 is made of a softer member than the second cushion CSH2.

  In this case, the contact surface of the first cushion CSH1 and the second cushion CSH2 is bent with respect to the surface together with a surface parallel to the substrate SUB of the liquid crystal display panel PNL, for example, as is apparent from FIG. Will have a face. For example, the first cushion CSH1 made of sponge or the like has elasticity while it is new, and it is difficult to form a gap on the contact surface with the second cushion CSH2, thereby reliably preventing dust from entering. However, when the first cushion CSH1 is deteriorated with time, the first cushion CSH1 is hardly deformed, and a gap is easily generated between the first cushion CSH1 and the second cushion CSH2. In this case, even if dust enters through this gap, a gap that is bent with respect to the gap is also formed. Therefore, the bent gap causes the dust to reach the back side of the liquid crystal display panel PNL. Be blocked. That is, the first cushion CSH1 in the third embodiment has the same function as the first rubber cushion GC1 used in the first embodiment. For this reason, the same effects as those of the first embodiment can be obtained by the configuration shown in the third embodiment.

  As described in the first embodiment, the first cushion CSH1 and the second cushion CSH2 are formed so as to surround the display area AR of the liquid crystal display panel PNL.

  FIG. 7 is a block diagram showing Embodiment 4 of the liquid crystal display device of the present invention, which is drawn in association with FIG.

  In FIG. 7, the configuration different from that in FIG. 6 is the first cushion CSH1 fixed to the middle frame MFR. The first cushion CSH1, for example, is overlapped with the second cushion CSH2 fixed to the liquid crystal display panel PNL on the side on the liquid crystal display panel PNL side, and the second cushion CSH2 on the side opposite to the liquid crystal display panel PNL. Are not overlaid. That is, the overlapping of the first cushion CSH1 and the second cushion CSH2 only needs to be partially overlapped in the width direction when viewed in plan.

  Even in this case, as shown in the third embodiment, even if dust enters from the gap between the first cushion CSH1 and the second cushion CSH2, a gap that is bent with respect to the gap is also formed. The bent gap prevents the dust from reaching the back side of the liquid crystal display panel PNL.

  In each of Example 3 and Example 4, the second cushion CSH2 fixed to the liquid crystal display panel PNL is made of silicon rubber, and the first cushion CSH1 fixed to the middle frame MFR is made of a softer material than silicon rubber. It is. However, the present invention is not limited to this, and the first cushion CSH1 may be made of silicon rubber and the second cushion CSH2 may be made of a softer material than silicon rubber.

  In the first to fifth embodiments, the backlight BL of the liquid crystal display device uses a light guide plate. However, it is not limited to this. For example, it may be a so-called direct type backlight in which a plurality of cold cathode ray tubes or light emitting diodes are arranged in parallel in a surface facing the liquid crystal display panel.

  The present invention has been described using the embodiments. However, the configurations described in the embodiments so far are only examples, and the present invention can be appropriately changed without departing from the technical idea. Further, the configurations described in the respective embodiments may be used in combination as long as they do not contradict each other.

DFR: Lower frame, BL: Backlight, LT: Cold cathode ray tube, CLB ... Light guide plate, REB ... Reflector plate, RES ... Reflective sheet, OPS ... Optical sheet, MFR ... Middle frame, OP ... Opening, GC1 ... First rubber cushion, PNL ... Liquid crystal display panel PNL, GC2 ... Second rubber cushion, SUB1, SUB2 ... Substrate, AR ... Display area, POL1, POL2 ... Polarizing plate, UFR ... upper frame, WD ... window (opening) GPi, GPm, GPo ... gap, CSH1 ... first cushion, CSH2 ... second cushion.

Claims (9)

A liquid crystal display device comprising a liquid crystal display panel and a frame on which the liquid crystal display panel is placed,
The liquid crystal display panel includes a first rubber cushion fixed so as to surround the display area outside the display area,
The frame includes a second rubber cushion fixed so as to surround the display area of the liquid crystal display panel placed on the frame,
The liquid crystal display panel is placed on the frame via the first rubber cushion and the second rubber cushion,
The liquid crystal display device, wherein the first rubber cushion and the second rubber cushion are arranged adjacent to each other without overlapping when viewed in a plan view. A lower frame for arranging a backlight, a middle frame arranged between the backlight and the liquid crystal display panel, and an upper frame arranged to expose the display area of the liquid crystal display panel,
The liquid crystal display device according to claim 1, wherein the frame on which the liquid crystal display panel is placed is the middle frame.   The first rubber cushion and the second rubber cushion are each configured by arranging a plurality of linear rubber cushions side by side in the circumferential direction of the display area of the liquid crystal display panel. 2. A liquid crystal display device according to 1.   4. The liquid crystal display device according to claim 1, wherein each of the first rubber cushion and the second rubber cushion is made of silicon rubber. A liquid crystal display device comprising a liquid crystal display panel and a frame on which the liquid crystal display panel is placed,
The liquid crystal display panel includes a first cushion fixed so as to surround the display area outside the display area,
The frame includes a second cushion fixed so as to surround the display area of the liquid crystal display panel placed on the frame,
The liquid crystal display panel is placed on the frame via the first cushion and the second cushion,
The first cushion and the second cushion are composed of a member in which one cushion is softer than the other cushion,
The liquid crystal display device, wherein the first cushion and the second cushion are arranged so as to partially overlap each other in a plan view. A lower frame in which a backlight is disposed, a middle frame disposed between the backlight and the liquid crystal display panel, and an upper frame disposed to expose the display area of the liquid crystal display panel,
The liquid crystal display device according to claim 5, wherein the frame on which the liquid crystal display panel is placed is the middle frame.   The said 1st cushion and the said 2nd cushion are respectively comprised by juxtaposing several linear cushions in the circumferential direction of the said display area | region of the said liquid crystal display panel. Liquid crystal display device.   8. The liquid crystal display device according to claim 5, wherein one of the first cushion and the second cushion is made of silicon rubber and the other is made of a sponge. 9. The width of the one cushion is larger than the width of the other cushion,
9. The liquid crystal display device according to claim 5, wherein the entire area of the other cushion is arranged so as to overlap with the one cushion in a plan view.

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