JP2019086761A - Liquid crystal display device - Google Patents

Abstract

To reduce the effect of deformation, in parallel with a main surface of a front panel of a backlight unit, to the front panel.SOLUTION: A liquid crystal display device comprises a bracket that is fixed to a side surface of a backlight unit and is bonded by a bonding part to a rear-side main surface of a front panel. The bracket includes: a side wall part that is fixed to the side surface of the backlight unit, rises upward from a rear side to a front side along the side surface, and extends along a side surface of the front panel; and a girder part that at least partially continues to the side wall part, protrudes along the rear-side main surface of the front panel to the outside of the side wall part, extends along the side surface of the front panel, and is bonded by the bonding part to the rear-side main surface of the front panel.SELECTED DRAWING: Figure 1D

Description

  The present disclosure relates to a liquid crystal display device.

  In liquid crystal display devices, a structure is known in which a front panel such as a decorated cover glass or touch panel is bonded with an optical elastic resin layer such as optical clear resin (OCR) or optical clear adhesive (OCA). .

  By directly bonding the front panel and the liquid crystal panel with a thin photoelastic resin layer, the image quality can be improved. In this case, the control substrate of the liquid crystal display device is fixed to the backlight unit, and the backlight unit is fixed to the front panel by bonding or double-sided tape.

  For example, Japanese Patent Application Laid-Open No. 2016-194670 discloses a structure in which a liquid crystal panel is bonded to a front surface protective plate and floated from a backlight unit. It is pointed out that this structure improves the image quality of the liquid crystal panel by preventing the reduction and distortion of the flatness of the backlight unit from applying load and distortion to the liquid crystal panel.

  Moreover, Unexamined-Japanese-Patent No. 2014-160218 discloses the structure which fixes a cover glass with a double-sided tape and an adhesive agent by the cover glass support case of a backlight unit. The double-sided adhesive tape is bonded to the center of each side, avoiding the four corners of the cover glass, so that the warp of the backlight unit is not transmitted to the cover glass.

JP, 2016-194670, A JP, 2014-160218, A

  The components of the backlight unit thermally expand due to the heat generation from the light source, causing distortion. This distortion distorts the front panel fixed with an adhesive or double-sided adhesive tape. In the configuration in which the front panel and the liquid crystal panel are bonded by the photoelastic resin layer, the distortion of the front panel causes the liquid crystal panel to be distorted. Distortion of the liquid crystal panel degrades the image quality. In a large-sized or high-brightness liquid crystal panel, distortion of the backlight unit also becomes large, and image quality deterioration (such as uneven brightness when displaying the same brightness image) becomes noticeable.

  The structure disclosed in Japanese Patent Application Laid-Open No. 2016-194670 is fixed to the front protective plate on one side of an outer chassis having an L-shaped cross section. The optical sheet, the resin light guide plate, the sheet metal parts and the like which are components of the backlight unit thermally expand due to the heat generation of the light source, so the distortion of the front protective plate and the liquid crystal panel becomes large. Moreover, in Unexamined-Japanese-Patent No. 2014-160218, the countermeasure against distortion in case a backlight unit expand | swells in the direction parallel to the main surface of a front surface protection plate (liquid crystal panel) is not shown.

  Therefore, a technique capable of reducing the influence on the front panel of distortion parallel to the main surface of the front panel of the backlight unit is desired.

  A liquid crystal display device according to an aspect of the present disclosure includes a backlight unit, a liquid crystal panel disposed on the front side of the backlight unit, and a liquid crystal panel disposed on the front side of the liquid crystal panel and having a transparent adhesive resin layer. A transparent front panel including a rear main surface bonded to the front main surface, and a bracket fixed to the side surface of the backlight unit and bonded to the rear main surface of the front panel by a bonding portion And. The bracket is fixed to the side surface of the backlight unit, rises along the side from the rear side to the front side, a side wall extending along the side of the front panel, and a girder located on the front side of the side wall Department and. The girder portion is at least partially continuous with the side wall portion, protrudes along the rear side main surface of the front panel to the outside of the side wall portion, and extends along the side surface of the front panel; It adhere | attaches with the said back side main surface of a panel, and the said adhesion part.

  According to one aspect of the present disclosure, it is possible to reduce the influence on the front panel of distortion parallel to the main surface of the front panel of the backlight unit.

The liquid crystal display device which concerns on 1st Embodiment seen from the front side is shown. It shows some elements extracted from the configuration of FIG. 1A. Arrow C in FIG. 1A indicates a side surface of the liquid crystal display device. The cross-section in the ID-ID cutting plane line in FIG. 1A is shown. The cross-section in the IE-IE cutting plane line in FIG. 1A is shown. 1 shows a first configuration example and a simulation image of a liquid crystal display device according to an embodiment. The 2nd structure and the simulation image of the liquid crystal display device which concern on embodiment are shown. The simulation result of the liquid crystal display device of two structures shown to FIG. 2A and 2B is shown. The liquid crystal display device which concerns on 2nd Embodiment seen from the front side is shown. It shows some elements extracted from the configuration of FIG. 3A. Arrow C in FIG. 3A indicates the side surface of the liquid crystal display device. The cross-section in the IIID-IIID cutting plane line in FIG. 3A is shown. Sectional structure in a IIIE-IIIE cutting line in Drawing 3A is shown. 7 shows an exemplary configuration of a liquid crystal display device according to another embodiment. 7 shows an exemplary configuration of a liquid crystal display device according to another embodiment. 7 shows an exemplary configuration of a liquid crystal display device according to another embodiment. Sectional structure in the VIB-VIB cutting line in FIG. 6A is shown. 7 shows an exemplary configuration of a liquid crystal display device according to another embodiment. 7 shows an exemplary configuration of a liquid crystal display device according to another embodiment. Arrow VIIIB in FIG. 8A indicates a side surface of the liquid crystal display device Sectional structure in a VIIIC-VIIIC cutting line in Drawing 8A is shown.

  Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the present embodiment is merely an example for realizing the present disclosure, and does not limit the technical scope of the present disclosure. The same reference numerals are given to the same configuration in each drawing.

First Embodiment
FIGS. 1A to 1E schematically show configuration examples of the liquid crystal display device 10 according to the first embodiment. FIG. 1A shows the liquid crystal display 10 viewed from the front side, and FIG. 1B shows some elements extracted from the configuration of FIG. 1A. FIG. 1C shows the side surface of the liquid crystal display device 10 indicated by the arrow C in FIG. 1A. FIG. 1D and FIG. 1E respectively show the cross-sectional structure in ID-ID cutting plane line and IE-IE cutting plane line in FIG. 1A. Hereinafter, the side of the user who views the image displayed on the liquid crystal display device 10 is referred to as the front side, and the opposite side is referred to as the rear side or the back side.

  1A shows the entire configuration of the liquid crystal display device 10, and FIG. 1B shows base plates 120A to 120D, side plates (L-shaped parts or angles) 130A to 130D, and screws extracted from the liquid crystal display device 10 shown in FIG. It shows 127. 1A and 1B show some of the components in solid lines and the other in broken lines.

  The liquid crystal display device 10 includes a rectangular backlight unit 140 and a rectangular liquid crystal panel 145 disposed on the front side of the backlight unit 140. A rectangular transparent cover panel 110 is disposed on the front side of the liquid crystal panel 145. As described later, the rear main surface of the cover panel 110 and the front main surface of the liquid crystal panel 145 are bonded by a transparent adhesive resin layer therebetween.

  The cover panel 110 is an example of a front panel, for example, a front plate formed of glass or resin. Instead of the cover panel 110, for example, a touch panel may be mounted. The liquid crystal panel 145 and the backlight unit 140 may have a polygonal shape different from a rectangular shape.

  In the present example, the cover panel 110 has four sides (side surfaces) 115A to 115D that define the outer shape. The outer shape of the cover panel 110 is larger than the outer shapes of the liquid crystal panel 145 and the backlight unit 140. The cover panel 110 covers the whole of the liquid crystal panel 145 and the backlight unit 140 as viewed from the front side. The outer shape of the liquid crystal panel 145 is smaller than the outer shape of the backlight unit 140. The liquid crystal panel 145 is included in the outline of the backlight unit 140 as viewed from the front side.

  Liquid crystal display device 10 includes base plates 120 </ b> A to 120 </ b> D along the sides of liquid crystal panel 145. The base plates 120A to 120D are plate-like parts having a rectangular shape when viewed from the front side. The widest principal surfaces face each other. The base plates 120A to 120D are disposed on the rear side of the cover panel 110, and when viewed from the front side, the cover panel 110 covers the entire base plates 120A to 120D. The side of each of the base plates 120A to 120D is located inside the side of the cover panel 110 as viewed from the front side.

  The base plates 120A to 120D are arranged along the periphery of the main surface of the cover panel 110. That is, the base plates 120 </ b> A to 120 </ b> D are arranged to overlap the peripheral region of the main surface of the cover panel 110. In the present example, base plates 120A and 120C opposed in the direction along the main surface of cover panel 110 have the same shape. Further, base plates 120B and 120D opposed in the direction along the main surface of cover panel 110 have the same shape.

  The base plates 120A and 120C extend along the left side and the right side of the cover panel 110 in FIG. 1A, respectively. The base plates 120B and 120D extend along the upper side and the lower side of the cover panel 110 in FIG. 1A, respectively. The base plates 120B and 120D are sandwiched by the base plates 120A and 120C in the direction along the main surface of the cover panel 110.

  The base plates 120 </ b> A to 120 </ b> D are arranged outside the liquid crystal panel 145 so as to surround the outer periphery thereof. When viewed from the front side, the base plates 120A to 120D cover the side indicating the outline of the backlight unit 140.

  Side plates 130A to 130D are disposed on the rear sides of the base plates 120A to 120D, respectively. 1A and 1B show only a part of each of the side plates 130A to 130D by a broken line. Specifically, a side wall portion 131 described later of the side plates 130A to 130D is shown.

  The side plates 130A and 130C are fixed to the base plates 120A and 120C by two screws 127, respectively. The side plates 130B and 130D are fixed to the base plates 120B and 120D with three screws 127, respectively. FIG. 1A indicates only one screw at 127. As described above, the base plates 120A to 120D are fixed to the side plates 130A to 130D in the regions arranged apart from each other along the side surfaces (side edges) of the cover panel 110, respectively.

  FIG. 1C shows the side surface of the liquid crystal display device 10 on which the side plate 130A and the base plate 120A are disposed. The structure of the other side is also the same. A side base plate 120A is disposed in front of the side plate 130A. The side plate 130A is fixed to the side surface of (the housing of) the backlight unit 140 by a screw 128. In the example of FIG. 1C, three screws 128 arranged along the side (side) of the cover panel 110 fix the side plate 130A to the side of the backlight unit 140.

  An adhesive layer (adhesive portion) 162 exists between the base plate 120A and the cover panel 110, and the adhesive layer (adhesive portion) 162 bonds the front side of the base plate 120A and the rear side of the cover panel 110. . The adhesive layer 162 can be formed of, for example, a double-sided adhesive tape, or a silicone-based resin or an acrylic resin that is cured by UV light, heat, moisture or the like.

  FIG. 1D shows a cross-sectional structure taken along the line ID-ID in FIG. 1A. Specifically, a cross-sectional structure of a portion where side plate 130A and base plate 120A are fixed by screw 127 is shown. FIG. 1E shows a cross-sectional structure taken along the line IE-IE in FIG. 1A. Specifically, a cross-sectional structure of a portion in which the side plate 130A and the base plate 120A are not fixed by the screw 127 is shown. The cross-sectional structure of the other side surface of the liquid crystal display device 10 is also similar to the structure shown in FIGS. 1D and 1E.

  From the rear side, a TFT (Thin Film Transistor) substrate 451, a CF (color filter) substrate 452, an adhesive resin layer 161, and a cover panel 110 are stacked. The TFT substrate 451 and the CF substrate 452 constitute a liquid crystal panel 145. The TFT substrate 451 and the CF substrate 452 are disposed on the front side of the backlight unit 140.

  A transparent adhesive resin layer 161 is present between the rear major surface 111 of the cover panel 110 and the front side 453 of the CF substrate 452. The adhesive resin layer 161 adheres to the rear main surface 111 of the cover panel 110 and the front side surface 453 of the CF substrate 452, and adheres and fixes the cover panel 110 and the CF substrate 452. The adhesive resin layer 161 is adhered to the front surface of the display area of the liquid crystal panel 145 (CF substrate 452), for example.

  The adhesive resin layer 161 is formed of, for example, an optical clear resin (OCR), which is a liquid resin that cures with UV light, heat, moisture, or the like. The adhesive resin layer 161 may be formed by OCA (Optical Clear Adhesive).

  The TFT substrate 451 and the CF substrate 452 are stacked and adhered to each other by a sealing material (adhesive) not shown. The CF substrate 452 is an opposing substrate of the TFT substrate 451. A liquid crystal material is sealed between the TFT substrate 451 and the CF substrate 452. The CF substrate 452 is disposed on the front side of the TFT substrate 451.

  In the present example, the TFT substrate 451 and the CF substrate 452 are rectangular. These may have other shapes. The TFT substrate 451 and the CF substrate 452 respectively have a main surface on the front side and a main surface on the back side, and four side end faces that surround the main surface.

  The TFT substrate 451 includes a substrate, a TFT array circuit formed on the front main surface of the insulating substrate, and a polarizing plate fixed to the rear main surface of the insulating substrate. The CF substrate 452 includes color filter layers of multiple colors formed on the back main surface of the insulating substrate, and a polarizing plate fixed to the front main surface of the insulating substrate.

  The TFT substrate 451 and the CF substrate 452 are disposed on the front side of the backlight unit 140. The liquid crystal panel 145 is separated from the backlight unit 140, and is suspended and supported by the cover panel 110 bonded by the adhesive resin layer 161. The liquid crystal panel 145 is also separated from the base plate 120A and the side plate 130A. The liquid crystal panel 145 may be in contact with the backlight unit 140, for example.

  The backlight unit 140 includes, for example, a stacked light guide plate, a diffusion plate, a light collector, and the like in addition to the light source. These components of the backlight unit 140 are housed in a housing. The backlight unit 140 emits planar light toward the liquid crystal panel 145.

  The TFT substrate 451 controls the amount of light transmitted from the backlight unit 140 for each pixel of the display area under the control of a controller (not shown). The color filter layer of each pixel of the CF substrate 452 selectively passes light of a specific color from the light from the TFT substrate 451.

  The CF substrate 452 may be an opposite substrate not having a color filter layer. The liquid crystal control method may be any of TN (Twisted Nematic), VA (Vertical Alignment), IPS (In-Plane-Switching), FFS (Fringe Field Switching), and the like.

  As shown in FIGS. 1D and 1E, the side plate 130A is a component having an L-shaped cross section. And a front end portion 132 continuous with the side wall portion 131 and the side wall portion 131 at a front end. The front end 132 projects outward (leftward in FIGS. 1D and 1E) from the front end 132. The angle between the side wall 131 and the front end 132 is approximately perpendicular in this example.

  The side plate 130A can be formed, for example, by pressing a single metal plate such as iron or stainless steel. In this case, the side wall portion 131 and the front end portion 132 both have a plate shape having the same thickness, are continuous, and are formed of the same material.

  The inner main surface of the side wall portion 131 faces the outer side surface 141 of the backlight unit 140, and the side wall portion 131 is fixed to the side surface 141 by a screw 128. The screw 128 is a male screw, and is screwed into a female screw formed in the housing of the backlight unit 140. The main surface of the side wall portion 131 is the surface having the largest area. The side wall portion 131 rises from the rear side to the front side along the side surface 141 of the backlight unit 140.

  As shown in FIGS. 1B and 1C, the side wall portion 131 extends along the side surface 115A of the cover panel 110. In the present example, the side surface 115 </ b> A viewed from the front side coincides with the side of the rear main surface 111.

  The front end portion 132 protrudes along the rear main surface 111 of the cover panel 110 to the outer side than the outer side surface (outer main surface) 133 of the side wall portion 131. The front end 132 extends along the side surface 115A of the cover panel 110. The width of the front end 132 is, for example, smaller than the width of the side wall 131.

  The base plate 120A is disposed on the front side of the front end portion 132. The front side surface (front side main surface) 321 of the front end portion 132 is opposed to the rear side surface (rear side main surface) 202 of the base plate 120A. The screw 127 penetrates a through hole formed in the front end portion 132 from the rear side surface of the front end portion 132 toward the front side surface 321. The screw 127 is a male screw and is screwed to a female screw formed in the base plate 120A.

  The base plate 120A is a plate formed of metal such as iron or stainless steel, for example. As will be described later, the flexural rigidity of the portion (stirred portion) constituted by the screw-fixed base plate 120A and the front end portion 132 is larger than the flexural rigidity of the side wall portion 131. Thereby, the deformation of the cover panel 110 due to the distortion in the in-plane direction of the backlight unit 140 can be suppressed.

  In the range which satisfy | fills the said conditions, the thickness of the base board 120A, the area of a main surface, and material are arbitrary. The thickness of the base plate 120A is the same as or different from the thickness of the front end portion 132. For example, the base plate 120A, the front end portion 132 and the side wall portion 131 are formed of the same material (for example, stainless steel: SUS 304) and have the same thickness.

  In this case, the thickness of the girder (the portion formed by the base plate 120A and the front end 132) is approximately twice that of the side wall 131 formed of the same material. As a result, the bending rigidity of the girder portion becomes greater than the bending rigidity of the side wall portion 131. The backlight unit 140 is heated and causes expansion when used for a long time. The deformation of the cover panel 110 caused by the backlight unit 140 pressing the side wall can be suppressed by the flexural rigidity of the girder being larger than that of the side wall.

As another example, the base plate 120A is made of a zinc steel plate (with a Young's modulus of about 205 × 10E9N / m ² ) having a large flexural rigidity, and the front end portion 132 (side wall part 131) is made of stainless steel (a Young's modulus of about 197 × 10E9N / m 2) May be If the two have the same thickness, the flexural rigidity of the girder becomes significantly greater than the flexural rigidity of the side wall 131. This configuration can further suppress the deformation of the cover panel 110. Further, by reducing the thickness of the base plate 120A in consideration of the Young's modulus, it is possible to suppress the deformation of the cover panel 110 and to reduce the weight of the material of the base plate 120A.

  In the example of FIGS. 1D and 1E, the front side 201 and the rear side 202 of the base plate 120A each have a wider width than the front side 321 of the front end 132. The base plate 120A protrudes inward (right side in FIGS. 1D and 1E) than (the inner main surface of) the side wall portion 131, and overlaps with a part of the backlight unit 140. The bonding area between the base plate 120A and the cover panel 110 can be expanded toward the inside of the backlight unit 140 (to the liquid crystal panel 145), and the width of the front end 132, that is, the frame area of the liquid crystal display device 10 can be reduced. .

  The front side surface 201 of the base plate 120A faces the rear side main surface 111 of the cover panel 110, and an adhesive layer 162 exists between them. The adhesive layer 162 adheres to the front side surface 201 of the base plate 120A and the rear main surface 111 of the cover panel 110. The continuous adhesion area by the adhesion layer 162 includes an area inside the inner major surface of the side wall portion 131 and an area outside the outer major surface 133.

  In the present example, the adhesive layer 162 is formed outside the adhesive resin layer 161 so as to be separated from the adhesive resin layer 161. By separately forming the adhesive layer 162 and the adhesive resin layer 161, more appropriate materials and shapes can be selected according to the respective required characteristics. The adhesive layer 162 may be a portion of the same material continuous with the adhesive resin layer 161.

  In the example of FIGS. 1D and 1E, the side plate 130, the base plate 120A, and the screws 127 for screwing them together constitute an example of a bracket for fixing the cover panel 110 to the backlight unit 140. Although the said structural example screw-fixes a base plate and a side plate, you may fix a base plate and a side plate with the adhesive agent of the some adhesion | attachment area | region spaced apart. The base plate and the side plate may be fixed by an adhesive in a continuous bonding area.

  With reference to FIGS. 2A, 2B, and 2C, the simulation results of the deformation amount of the front panel caused by the distortion of the backlight unit in liquid crystal display devices having different configurations will be described. FIG. 2A shows a first configuration example and a simulation image of the liquid crystal display device according to the embodiment. FIG. 2B shows a second configuration and a simulation image of the liquid crystal display device according to the embodiment. FIG. 2C shows the simulation results of the liquid crystal display device of the above two configurations.

  The first configuration example shown in FIG. 2A includes a cover spring 11 and a side plate 130 adhered to the cover panel 110 and screwed to the backlight unit 140. That is, in the configuration described with reference to FIGS. 1A to 1E, the base plate is omitted. The thickness of the side wall portion of the side surface plate 130 is represented by t1, and the thickness of the front end portion (the beam portion) is represented by t2. Further, the deformation amount of the cover panel 110 is represented by Δ1. The stress due to the deformation of the backlight unit 140 is applied to the side wall portion of the side plate 130 on the outside.

  The second configuration example shown in FIG. 2B is screwed to the cover spring 11, the base plate 120 bonded to the cover panel 110, the base plate 120 and the backlight unit 140 in the configuration described with reference to FIGS. 1A to 1E. And the side plate 130.

  The thickness of the side wall portion of the side plate 130 is represented by t1. The total thickness of the stacked front end portion and base plate 120 (shear portion) is represented by t2. The amount of deformation of the cover panel 110 is represented by Δ2. The stress due to the deformation of the backlight unit 140 is applied to the side wall portion of the side plate 130 on the outside.

  FIG. 2C shows simulation results of the configuration shown in FIGS. 2A and 2B. The vertical axis represents the ratio of the deformation amounts Δt1 and Δt2 of the cover panel 110 to the reference value. The reference value is the amount of deformation Δt1 when the thickness t1 of the side wall and the thickness t2 of the front end are the same in the first configuration example. A line 271 indicates a simulation result of the first configuration example. A line 272 shows the simulation result of the second configuration example. The line 273 shows an example of the maximum deformation of the cover panel 110 that is allowed.

  A line 271 indicates the relationship between the deformation amount Δt1 of the first configuration example and the ratio of the thickness t1 of the side wall portion to the thickness t2 of the girder portion. As the thickness t2 of the girder portion with respect to the thickness t1 of the side wall portion increases, the deformation amount Δt1 of the cover panel 110 decreases.

  A line 272 indicates the relationship between the deformation amount Δt2 of the second configuration example and the ratio of the thickness t1 of the side wall portion to the thickness t2 of the girder portion. In the simulation, the thickness t2 was changed by maintaining the thickness of the front end equal to the thickness of the side wall and changing the thickness of the base plate 120. As the thickness t2 of the girder portion with respect to the thickness t1 of the side wall portion increases, the deformation amount Δt2 of the cover panel 110 decreases. When the ratio between the thickness t1 of the side wall portion and the thickness t2 of the girder portion is the same, the deformation amount of the second configuration example is smaller than the deformation amount of the first configuration example.

  As apparent from the simulation result shown in FIG. 2C, as the gage thickness t2 increases relative to the sidewall thickness t1, the amount of deformation of the cover panel 110 decreases. Further, by fixing the base plate 120 to the front end portion of the side plate 130 in a plurality of spaced areas, the amount of deformation of the cover panel 110 can be further reduced.

  When the backlight unit 140 is deformed by thermal expansion, external stress is applied to the side surface plate 130 fixed to the side surface 141 of the backlight unit 140 in the direction parallel to the main surface of the cover panel 110.

  In the first configuration example, the side surface plate 130 is directly bonded to the cover panel 110 in a plane parallel to the main surface of the cover panel 110 (the front side surface 321 of the front end portion 132). In the second configuration example, the side surface plate 130 is partially fixed to the base plate 120 at a surface parallel to the main surface of the cover panel 110 (the front side surface 321 of the front end portion 132). The base plate 120 is adhered to or through the cover panel 110.

  The deformation of the side plate 130 applies a bending moment to the front end 132 with the corner between the side wall 131 and the front end 132 as an axis. This causes distortion in the cover panel 110 and the base plate 120.

  However, by increasing the thickness of the front end portion 132 in the first configuration example, the bending rigidity of the front end portion 132 (the girder portion) can be increased. Further, in the second configuration example, by increasing the thickness of the base plate 120, the bending rigidity of the screw fixed front end portion 132 and the base plate 120 (the beam portion) is increased.

  When the bending rigidity of the girder portion is larger than the bending rigidity of the side wall portion 131, the girder portion is less likely to be deformed as compared with the side wall portion 131. The relatively deformable side wall portion 131 is largely deformed, and the deformation of the girder portion and the deformation of the cover panel 110 due to the deformation are reduced. As a result, it is possible to suppress the deterioration of the image quality due to the deformation of the liquid crystal panel 145 bonded to the cover panel 110 by the adhesive resin layer 161.

  Further, from the simulation results, by partially fixing the base plate 120 to the side plate 130, the amount of deformation of the girder portion and the cover panel 110 can be further reduced. By changing the thickness difference and the material of the side plate 130 and the base plate 120, it is possible to easily adjust the difference in rigidity of the side wall portion and the girder portion (difference in strength to withstand distortion).

Second Embodiment
3A to 3E show an example of the configuration of the liquid crystal display device 10 according to the second embodiment. The bracket of this configuration further includes a female screw stud projecting rearward from the rear side of the base plate 120. The male screw 127 passes through the hole of the front end portion 132 of the side plate 130 and is screwed into the female screw stud. Thus, the base plate 120 and the front end portion 132 of the side plate 130 can be more securely screwed. The differences from the first embodiment will be mainly described below.

  FIG. 3A shows the liquid crystal display 10 viewed from the front side, and FIG. 3B shows some elements extracted from the configuration of FIG. 1A. FIG. 3C shows the side surface of the liquid crystal display device 10 indicated by the arrow C in FIG. 3A. FIG. 3D and FIG. 3E show cross-sectional structures along IIID-IIID cutting line and IIIE-IIIE cutting line in FIG. 3A, respectively.

  3A shows the entire configuration of the liquid crystal display device 10, and FIG. 3B shows base plates 120A to 120D, side plates 130A to 130D, external threads 127, and internal thread studs 137 extracted from the liquid crystal display device 10 shown in FIG. Indicates 3A and 3B show some of the components in solid lines and the other in broken lines.

  FIG. 3C shows the side surface of the liquid crystal display device 10 on which the side plate 130A and the base plate 120A are disposed. The structure of the other side is also the same. The front end 132 of the side plate 130A includes a plurality of spaced apart front portions 323A, 323B, 323C. The front end 132 further includes spaced apart rear portions 324A, 324B.

  The posterior portions 324A, 324B are posterior to the anterior portions 323A, 323B, 323C (lower in FIG. 3C). Each rear side portion is present between the front side portions in a direction (left and right direction in FIG. 3C) along the side surface 151A of the cover panel 110 (the side of the rear side main surface 111). Specifically, the back portion 324A is between the front portions 323A, 323B and the back portion 324B is between the front portions 323B, 323C.

  A plurality of female screw studs 137 are embedded in and fixed to the base plate 120A. In the example of FIG. 3C, two female screw studs 137 are fixed to the base plate 120A. In FIG. 3C, only one female threaded stud is indicated at 137. The female screw studs 137 are located on the front side of the rear portions 324A, 324B, respectively. The number of internally threaded studs 137 and the number of rear portions 324A, 324B coincide, and their positions as viewed from the front also coincide.

  The male threads 127 penetrate the holes formed in the rear portions 324A and 324B from the rear side to the front side and are screwed into the female screw studs 137, respectively. The base plate 120A and the side plate 130A are fixed only by the male screw 127. The number of fixed positions of the base plate 120A and the side plate 130A (the number of male threads 127 or female threaded studs 137) is any one or more.

  FIG. 3D shows a cross-sectional structure taken along the line IIID-IIID in FIG. 3A. Specifically, a cross-sectional structure of a portion where side plate 130A and base plate 120A are fixed by screw 127 is shown. FIG. 3E shows a cross-sectional structure taken along the line IIIE-IIIE in FIG. 3A. Specifically, a cross-sectional structure of a portion in which the side plate 130A and the base plate 120A are not fixed by the screw 127 is shown. The cross-sectional structure on the other side surface of the liquid crystal display device 10 is also similar to the structure shown in FIGS. 3D and 3E.

  As shown in FIG. 3D, the female screw stud 137 is made of metal such as stainless steel or iron, for example, and is embedded in the base plate 120A. The female screw stud 137 protrudes rearward from the base plate 120A, and the side surface 371 is on the rear side of the rear side surface 202 of the base plate 120A. The rear portion 324A of the front end portion 132 of the side plate 130A is in contact with the rear side 371 of the female screw stud 137.

  The rear portion 324A is separated from the base plate 120A. The male screw 127 penetrates the hole formed in the rear portion 324A from the rear side to the front side and is screwed into the female screw stud 137. The male screw 127 and the female screw stud 137 screw-fix the rear portion 324A (side plate 130A) and the base plate 120A.

  As shown in FIG. 3E, the front portion 323B of the front end portion 132 of the side plate 130A faces the base plate 120A in the portion where the screw is not fixed. The front side portion 323B is in contact with the rear side surface 202 of the base plate 120A or there is a clearance between the front side portion 323B and the rear side surface 202 of the base plate 120A.

  When an external stress that deforms the side plate is applied by the thermal expansion of the backlight unit 140, the stress is concentrated at the screwed point. As described with reference to FIG. 3D, in the present embodiment, the side plate and the base plate are fixed by the female screw stud and the male screw that project rearward from the base plate, and It is separated from the base plate.

  As described with reference to FIG. 3E, the side plate and the base plate are separated only with contact or with a clearance at the non-screwed portion. Therefore, the base plate is hard to be directly subjected to the deformation stress, so that the stress on the cover panel and the liquid crystal panel can be reduced and the image quality deterioration can be suppressed.

  The above configuration example includes four separate brackets for fixing the backlight unit 140 and the cover panel 110. Four brackets surround the backlight unit 140 and the cover panel 110. Each bracket includes a side plate and a base plate. Alternatively, the base plates of the four brackets may be continuous to form a ring.

[Other embodiments]
Below, the structural example of the liquid crystal display device 10 which concerns on other embodiment is demonstrated. Mainly, differences from the embodiments described above will be described. FIG. 4 shows a configuration example of a liquid crystal display device 10 according to another embodiment. FIG. 4 shows the end face structure of the side end of the liquid crystal display device 10 as shown in FIG. 1D or 1E. The cross-sectional structure in the other side surface of the liquid crystal display device 10 is also the same.

  Compared with the configuration described with reference to FIGS. 1A to 1E, the configuration shown in FIG. 4 omits screws for fixing the base plate and the base plate to the side plate. The front side surface of the front end portion 132 of the side surface plate 130A and the rear side surface of the cover panel 110 are bonded by an adhesive layer 162. The front end portion 132 of the side surface plate 130A has higher bending rigidity than the side wall portion 131. In the example shown in FIG. 4, the thickness t 2 of the front end portion 132 is thicker than the thickness t 1 of the side wall portion 131. The thickness of the front end portion 132 and the thickness of the side wall portion 131 are constant.

  As described with reference to FIGS. 2A and 2C, the deformation of the front end 132 is suppressed by making the bending rigidity of the front end 132 higher than the bending rigidity of the side wall 131, and as a result, the cover panel 110. And stress on the liquid crystal panel 145 can be reduced. The side plate 130A can be made, for example, by extrusion of aluminum, magnesium or the like. According to this configuration, the number of parts of the liquid crystal display device 10 can be reduced.

  FIG. 5 shows a configuration example of a liquid crystal display device 10 according to another embodiment. FIG. 5 shows the end face structure of the side end of the liquid crystal display device 10 as shown in FIG. 1D or 1E. The cross-sectional structure in the other side surface of the liquid crystal display device 10 is also the same. As compared with the configuration described with reference to FIGS. 1A to 1E, the configuration shown in FIG. 5 omits screws for fixing the base plate and the base plate to the side plate. Furthermore, the front end is bent so that the cross section of the side plate is T-shaped.

  In the configuration example shown in FIG. 5, the side surface plate 180 includes a side wall portion 181 and a front end portion 182. The side wall portion 181 is similar to the side wall portion 131 described with reference to FIGS. 1A to 1E. The front end portion 182 is bent continuously to the side wall portion 181. The front end portion 182 protrudes along the rear main surface 111 of the cover panel 110 to the outside of the side wall portion 181. The front end portion 182 further protrudes along the rear main surface 111 of the cover panel 110 to the inside of the side wall portion 181.

  The front end portion 182 is continuous with the side wall portion 181, and a portion 183 projecting outward (left side in FIG. 5) and a portion 184 continuous with the portion 183 and projecting inward (right side in FIG. 5) And. The portion 184 is in front of the portion 183. The front surface of the portion 184 is adhered to the back major surface 111 of the cover panel 110 by an adhesive layer 162.

  In the configuration example shown in FIG. 5, the base plate and screws for fixing the base plate and the side plate are omitted. The front end portion 182 protrudes inward from (the inner main surface of) the side wall portion 181 and overlaps a part of the backlight unit 140. The bonding area between the front end portion 182 and the cover panel 110 can be expanded toward the inside of the backlight unit 140 (to the liquid crystal panel 145), and the frame area of the liquid crystal display device 10 can be reduced.

  6A and 6B show a configuration example of a liquid crystal display device 10 according to another embodiment. FIG. 6A shows a plan view of the liquid crystal display device 10. In FIG. 6A, the backlight unit 140 is omitted. FIG. 6B shows a cross-sectional structure taken along the line VIB-VIB in FIG. 6A. The cross-sectional structure in the other side surface of the liquid crystal display device 10 is also the same. As compared with the configuration described with reference to FIGS. 1A to 1E, portions of the base plates 120A and 120B are cut away.

  By passing the flexible cable 456 connected to the liquid crystal panel 145 through the notch, contact between the flexible cable 456 and the base plate can be avoided, and stress on the flexible cable 456 can be reduced. The flexible cable 456 is, for example, a COF (Chip On Film) polyimide film substrate.

  As shown in FIG. 6A, the base plate 120A has three notches 126 spaced apart on the inner side facing the liquid crystal panel 145. The base plate 120A has two notches 126 spaced apart on the inner side opposite to the liquid crystal panel 145. The base plate 120 B has four notches 126 on the inner side facing the liquid crystal panel 145. Only one notch is indicated at 126 and only one flexible cable is indicated at 456.

  Each notch 126 is opposed to the connection area of the flexible cable 456 with the liquid crystal panel 145. The notch 126 makes the space between the liquid crystal panel 145 and the base plate wider than the portion where the notch 126 does not exist. The width (the length in the direction along the side surface of the liquid crystal panel 145) of the notch 126 is larger than the width of the flexible cable 456.

  As shown in FIG. 6B, the flexible cable 456 extending from the TFT substrate 451 of the liquid crystal panel 145 passes through the notch 126 of the base plate 120A, the space between the backlight unit 140 and the side plate 130, and back light unit. It is connected to a control board (not shown) fixed to the rear side surface of 140.

  The notch 126 is formed to avoid interference between the flexible cable 456 and the base plate, and the region not facing the flexible cable 456 is bonded to the cover panel 110 without being cut away. For this reason, the adhesion | attachment area | region required for adhesion | attachment of a base board and the cover panel 110 is securable.

  FIG. 7 shows a configuration example of a liquid crystal display device 10 according to another embodiment. FIG. 7 shows the end face structure of the side end of the liquid crystal display device 10 as shown in FIG. 1D or 1E. The cross-sectional structure in the other side surface of the liquid crystal display device 10 is also the same. The configuration shown in FIG. 7 differs from the configuration described with reference to FIGS. 1A to 1E in the method of attaching the base plate to the side plate.

  In the configuration shown in FIG. 7, the base plate 120A is attached to the side plate 130A slidably on the front side surface of the front end portion 132 of the side plate 130A. Thereby, the deformation of the base plate 120A and the cover panel 110 due to the deformation of the backlight unit 140 is suppressed.

  Referring to FIG. 7, female screw studs 139 are press-fit into base plate 120A. The female screw studs 139 project rearward from the rear side of the base plate 120A. The front end portion 132 of the side plate 130A has a hole 325 larger than the outer diameter of the female screw stud 139. There is a clearance that does not come off between the inner periphery of the hole 325 and the female screw stud 139.

  The female screw stud 139 passes through the hole 325 of the front end portion 132 of the side plate 130A. The male screw 127 is screwed into the female screw stud 139 from the rear side of the front end portion 132. A washer 129 is sandwiched between the front side of the head portion of the male screw 127 and the rear side of the female screw stud 139. The male screw 127 and the female screw stud 139 are screwed with the washer 129 interposed therebetween. If the outer diameter of the head portion of the male screw 127 is larger than the diameter of the hole 325 of the front end portion 132, the washer 129 may be omitted.

  The height (length in the front-rear direction) of the female screw stud 139 is larger than the thickness of the front end portion 132 of the side plate 130A. The female screw stud 139 protrudes rearward from the hole 325. The rear side of the female threaded stud 139 is on the rear side of the front side 132 from the rear side. The outer diameter of the washer 129 is larger than the diameter of the hole 325. There is a clearance that does not come off between the front side of the head of the external thread 127 and the washer 129 and the rear side of the front end 132.

  The side plate 130A is not completely fixed to the base plate 120A, and the side plate 130A can slide in the direction parallel to the main surface of the cover panel 110 as the backlight unit 140 deforms. The flexural rigidity of the girder including the base plate 120A and the front end 132 may be equal to or less than the flexural rigidity of the side wall 131.

  When an external stress that deforms the side plate 130A is applied by the thermal expansion of the backlight unit 140, the side plate 130A follows the deformation of the backlight unit 140 and slides relative to the base plate 120A. Therefore, no distortion occurs in the base plate 120A. Therefore, no stress is generated on the cover panel 110 and the liquid crystal panel 145, and the image quality deterioration can be suppressed.

  8A to 8C show configuration examples of a liquid crystal display device 10 according to another embodiment. Compared with the configuration example described with reference to FIGS. 1A to 1E, the structure for attaching the side plate to the base plate is different, and the screws for fixing the base plate and the side plate are omitted.

  FIG. 8A shows a plan view of the liquid crystal display device 10. In FIG. 8A, the backlight unit 140 is omitted. FIG. 8B shows the side surface of the liquid crystal display device 10 indicated by the arrow VIIIB in FIG. 8A. The structure on the other side surface of the liquid crystal display device 10 is also similar to the structure shown in FIG. 8B.

  FIG. 8C shows a cross-sectional structure taken along line VIIIC-VIIIC of FIG. 8A. Specifically, the cross-sectional structure of the part to which side plate 130A and base plate 120A are fixed is shown. The cross-sectional structure of the other side surface of the liquid crystal display device 10 is also similar to the structure shown in FIG. 8C.

  In the side view shown in FIG. 8B, the base plate 120A has a plurality of spaced apart spars 502A, 502B. The side wall portion 511 of the side plate 130A has holes 512A, 512B larger than the outline of the girder portions 502A, 502B of the base plate.

  In the cross-sectional structure shown in FIG. 8C, base plate 120A has side wall portion 501 vertically formed from front side surface 201, formed by bending, and girder portion 502A projecting outward (left side in FIG. 8C). . The front end portion 503 of the girder portion protrudes more than the side wall portion 511 of the side surface plate 130A.

  The front side 504 of the girder portion 502A of the base plate 120A is in contact with the rear side 513 of the front end 132 of the side plate 130A, or a clearance exists therebetween. The side plate 130A is attached to the base plate 120A in a slidable manner on the rear side of the girder portion 502A of the base plate. In assembly, since the side plate 130A follows the position of the base plate 120A, no distortion occurs in the base plate 120A. The flexural rigidity of the base plate 120A may be equal to or less than the flexural rigidity of the side plate 130A.

  When an external stress that deforms the side plate 130A is applied by the thermal expansion of the backlight unit 140, the side plate 130A follows the deformation of the backlight unit 140 and slides relative to the base plate 120A. Therefore, no distortion occurs in the base plate 120A. Therefore, stress on the cover panel 110 and the liquid crystal panel 145 does not occur, and image quality degradation can be suppressed.

  As mentioned above, although embodiment of this indication was described, this indication is not limited to said embodiment. Those skilled in the art can easily change, add, or convert the elements of the above-described embodiment within the scope of the present disclosure. It is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment.

10 Liquid Crystal Display, 110 Cover Panel, 111 Cover Panel Back Side Main Surface, 115
A-115D side of cover panel, 120, 120A-120D base plate, 126 notched portion of base plate, 127 male screw, 128 male screw, 129 washer, 130A-130D side plate, 131 side plate side wall portion, 132 side Front end of face plate, 133 Side plate outer main surface, 137 female screw stud, 139 female screw stud, 140 backlight unit, 141 backlight unit side, 145 liquid crystal panel, 161 adhesive resin layer, 162 adhesive layer, 180 side Face plate, side wall portion of 181 side plate, front end portion of 182 side plate, portion of front end portion of 183, portion of front end portion of 184, front side of 201 base plate, rear side of 202 base plate, 321 front side, side of 323A-323C Front portion of front end of face plate, 324A, 324B Rear portion of front end of side plate, 325 holes, 3 71 rear surface of female screw stud, 451 TFT substrate, 452 CF substrate, 453 CF substrate front side, 456 flexible cable, 501 base plate side wall portion, 502A-502B base plate girder portion, 503 base plate girder portion Tip, front side of girder of 504 base plate, side wall of 511 side plate, hole of side plate of 512A-512B, rear side of front end of 513 side plate

Claims (17)

A backlight unit,
A liquid crystal panel disposed on the front side of the backlight unit;
A transparent front panel including a rear main surface disposed on the front side of the liquid crystal panel and bonded to the front main surface of the liquid crystal panel by a transparent adhesive resin layer;
A bracket fixed to a side surface of the backlight unit and adhered to the rear main surface of the front panel by an adhesive portion;
Including
The bracket is
A side wall portion fixed to the side surface of the backlight unit, rising from the rear side to the front side along the side surface, and extending along the side surface of the front panel;
And a girder portion on the front side of the side wall portion,
The said digit part is
At least a portion is continuous with the side wall, protrudes along the rear main surface of the front panel to the outside of the side wall, extends along the side of the front panel, and the rear of the front panel Bonded by the main surface and the bonding portion,
Liquid crystal display device. The liquid crystal display device according to claim 1, wherein
The bracket is
L-shaped parts having an L-shaped cross section;
And a base plate fixed to the L-shaped part.
The side wall portion;
A front end portion which is a part of the girder portion and is continuous with the side wall portion and protrudes along the rear side main surface of the front panel to the outside of the side wall portion;
Including
The base plate is
The rear side opposite to the front side of the front end, and the front side adhering to the bonding portion;
It projects along the rear side main surface of the front panel to the outside of the side wall portion,
Liquid crystal display device. The liquid crystal display device according to claim 2,
The Young's modulus of the L-shaped component is less than or equal to the Young's modulus of the base plate,
Liquid crystal display device. The liquid crystal display device according to claim 2,
The material of the L-shaped part and the material of the base plate are identical,
Liquid crystal display device. The liquid crystal display device according to any one of claims 1 to 4, wherein a bending rigidity of the girder portion is larger than a bending rigidity of the side wall portion.
Liquid crystal display device. The liquid crystal display device according to claim 3, wherein
The base plate is fixed to the front end portion of the L-shaped component in each of the regions arranged spaced apart along the side surface of the front panel.
Liquid crystal display device. The liquid crystal display device according to claim 6, wherein
The bracket further includes a female screw stud projecting rearward from the rear side of the base plate,
The front end of the base plate is
A plurality of front portions,
And a rear portion located between the plurality of front portions in a direction along the side of the front panel, the rear portion being posterior to the front portion;
The base plate is screwed to the front end portion by the female screw stud and a male screw passing through a hole of the rear portion.
Liquid crystal display device. The liquid crystal display device according to claim 3, wherein
The base plate is
It projects along the rear side main surface of the front panel to the inside of the side wall portion,
The continuous region bonded to the bonding portion at the front side surface of the base plate includes a region inside the side wall and a region outside the side wall.
Liquid crystal display device. The liquid crystal display device according to claim 3, wherein
The side wall portion and the front end portion of the L-shaped component have the same thickness.
Liquid crystal display device. The liquid crystal display device according to claim 3, wherein
A notch is formed on the inner side surface of the base plate at a position opposite to the position where the flexible cable is connected to the liquid crystal panel.
Liquid crystal display device. The liquid crystal display device according to claim 2,
The said digit part is
It is a portion bent continuously to the side wall portion,
It projects along the back side main surface of the front panel to the outside of the side wall portion, and further projects along the back side main surface of the front panel to the inside of the side wall portion.
Liquid crystal display device. The liquid crystal display device according to claim 2,
A plurality of brackets fixed to each of a plurality of side surfaces of the backlight unit;
Each bracket of the plurality of brackets is
A side wall portion fixed to the corresponding side surface of the backlight unit, rising from the rear side to the front side along the corresponding side surface, and extending along the side of the rear side main surface of the front panel;
And a girder portion on the front side of the side wall portion,
The said digit part is
At least a portion is continuous with the side wall portion, protrudes along the rear side main surface of the front panel to the outside of the side wall portion, and extends along the side of the rear side main surface of the front panel; The rear main surface of the front panel and the bonding portion are bonded.
Liquid crystal display device. The liquid crystal display device according to claim 12, wherein the bending rigidity of the girder portion is larger than the bending rigidity of the side wall portion.
Liquid crystal display device. A backlight unit,
A liquid crystal panel disposed on the front side of the backlight unit;
A transparent front panel including a rear main surface disposed on the front side of the liquid crystal panel and bonded to the front main surface of the liquid crystal panel by a transparent adhesive resin layer;
A bracket fixed to the side surface of the backlight unit and adhered to the rear main surface of the front panel by an adhesive;
Including
The bracket is
L-shaped parts having an L-shaped cross section;
A base plate and the L-shaped component is
A side wall portion fixed to the side surface of the backlight unit, rising from the rear side to the front side along the side surface, and extending along the side surface of the front panel;
A front end portion which is continuous with the side wall portion, protrudes along the rear main surface of the front panel to the outside of the side wall portion, and extends along the side surface of the front panel;
Including
The base plate is present on the front side of the front end, protrudes along the rear main surface of the front panel to the outside of the side wall, and extends along the side surface of the front panel.
The bonding portion is bonded to the front side surface of the base plate.
Liquid crystal display device. The liquid crystal display device according to claim 14, wherein
The base plate is slidably attached to the L-piece on the front side of the front end,
Liquid crystal display device. The liquid crystal display device according to claim 14, wherein
The base plate is fixed to the front end of the L-shaped component in a region spaced apart and arranged along the side surface of the front panel.
Liquid crystal display device. The liquid crystal display device according to claim 16, wherein
The bracket further includes a female screw stud projecting rearward from the rear side of the base plate,
The front end of the base plate is
A plurality of front portions,
And a rear portion located between the plurality of front portions in a direction along the side of the front panel, the rear portion being posterior to the front portion;
The base plate is fixed to the front end by the female screw stud and an external thread passing through a hole in the rear portion.
Liquid crystal display device.