JP2006235154A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display preventing defects of displaying such as blurring of the display (a puddling phenomenon), caused by the contact of a front frame and a liquid crystal display panel. <P>SOLUTION: The liquid crystal display 1 comprises: a box-shaped back case 5 opened upward; a backlight unit 4 disposed in the center of the back case 5; a resin frame body 3 which is formed in a frame shape, has a mounting surface, and is disposed at the periphery of the back case 5; a liquid crystal display panel 2 which is disposed above the backlight unit 4 and mounted on the mounting surface; and a front frame 6 which covers the periphery of the liquid crystal display panel 2 and the frame body 3, and which is fixed on the back case 5 or on the frame body 3. A plurality of ribs 34 are formed separately at a predetermined interval at the periphery of the frame body 3. A concave part 61 of a predetermined depth is disposed at the periphery of the front frame 6, and the front frame 6 is supported by the engagement of the ribs 34 and the bottom surface of the concave part 61. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display device, and more particularly to a structure of a frame provided between a backlight unit and a liquid crystal display panel.

  As display devices for electronic devices such as personal computers and televisions, liquid crystal display devices that are lightweight, thin, and have low power consumption have been rapidly spreading in recent years. Along with this, there are many items required for the liquid crystal display device, and among them, display defects due to interference caused when the liquid crystal display panel and the front frame come into contact with the thinning of the liquid crystal display device itself (so-called “so-called”). Prevention of paddling).

  The present applicant has already invented a liquid crystal display device in consideration of the display defect and has filed a patent application (see Patent Document 1 below). A liquid crystal display device 100 shown in Patent Document 1 below includes a resin frame 103 that supports a liquid crystal display panel 101, which is positioned between the liquid crystal display panel 101 and the backlight unit 102, A base portion 103 a that forms a predetermined gap, and a rib 103 b that protrudes toward the surface of the liquid crystal display device 100 and supports the front frame 104.

As a result, in the liquid crystal display device 100 disclosed in Patent Document 1, by providing the frame body 103, a gap d of a predetermined interval is provided between the backlight unit 102 and the liquid crystal display panel 101, and the front frame 104 is attached to the rib 103 b. Support with. With this configuration, contact between the front frame 104 and the liquid crystal display panel 101 is prevented.
Japanese Patent Laid-Open No. 11-160681

  The liquid crystal display device 100 shown in Patent Document 1 can prevent the front frame 104 and the liquid crystal display panel 101 from contacting each other by supporting the front frame 104 with ribs 103 b provided on the frame 103. However, since the frame 103 is made of a resin and the rib-shaped ribs 103b are continuously provided, the deformation or warpage (so-called sink marks) accompanying the volume contraction of the resin particularly in the long side portion of the ribs 103b. ) Occurs. As a result, the clearance between the front frame 104 and the liquid crystal display panel 101 may be uneven. For this reason, the front frame 104 may partially contact the liquid crystal display panel 101 to cause display defects due to interference.

  In view of the above problems, the present inventor has studied various liquid crystal display devices that can more reliably support a front frame by a resin frame. As a result, it has been found that if the ribs for supporting the front frame are separated and formed in a plurality, the long side portion of each rib can be shortened, so that the resin frame can be prevented from sinking. In addition, if the concave portion is provided on the peripheral side of the front frame and the bottom surface of the concave portion of the front frame is brought into contact with the rib, the flatness of the front frame can be ensured. As a result, the front frame and the liquid crystal display panel It has been found that the clearance between the two can be maintained, and the present invention has been completed.

  That is, an object of the present invention is to provide a liquid crystal display device that prevents display defects such as blurring display (paddling phenomenon) due to contact between a front frame and a liquid crystal display panel.

  In order to achieve the above object, a liquid crystal display device according to claim 1 of the present application includes a box-shaped back case opened upward, a backlight unit disposed on the center side of the back case, and the back side. A resin-made frame that is disposed on the peripheral side of the case and has a mounting surface, and a liquid crystal display panel that is positioned above the backlight unit and mounted on the mounting surface; The liquid crystal display panel includes a front frame fixed to the periphery of the liquid crystal display panel and the frame and fixed to the back case or the frame, and the frame is formed with a plurality of ribs separated at predetermined intervals. The front frame is provided with a recess formed at a predetermined depth on the peripheral side, and the front frame is supported by bringing the rib and the bottom surface of the recess into contact with each other. .

  The invention according to claim 2 relates to the liquid crystal display device according to claim 1, wherein the recesses have the same depth and are provided on the four sides on the peripheral side of the front frame. And

  According to a third aspect of the invention, there is provided the liquid crystal display device according to the first aspect, wherein the frame body has a recess formed adjacent to or in the vicinity of the rib.

  According to a fourth aspect of the invention, there is provided the liquid crystal display device according to the third aspect, wherein the frame body has a projection that is taller than the rib at a location adjacent to the recess. The upper surface is formed at a height that does not contact the front frame.

  The invention according to claim 5 relates to the liquid crystal display device according to claim 4, wherein the frame body is provided with a mounting surface for mounting the liquid crystal display panel on its inner peripheral side, The rib, the recess, and the protrusion are formed in order on the outer peripheral surface in the outward direction.

  The invention according to claim 6 relates to the liquid crystal display device according to claim 4, wherein the frame body is provided with a mounting surface for mounting the liquid crystal display panel on its inner peripheral side, The rib, the projecting portion, the recess, and the projecting portion are formed in order on the outer peripheral surface in the outward direction.

  The invention according to claim 7 relates to the liquid crystal display device according to claim 4, wherein the frame body is provided with a mounting surface for mounting the liquid crystal display panel on its inner peripheral side, The protrusions, recesses, ribs and protrusions are formed on the outer peripheral surface in order outward.

  By having the above configuration, the present invention has the following excellent effects. That is, according to the invention described in claim 1 of the present application, since the plurality of ribs are separately formed around the frame at a predetermined interval, the long side portion of each rib can be shortened. In addition, it is possible to prevent the occurrence of sink marks due to the volume shrinkage of the resin frame, and to prevent the non-uniformity of the clearance between the front frame and the liquid crystal display panel. In addition, a concave portion formed at a predetermined depth is provided on the peripheral side of the front frame, and since the rib and the bottom surface of the concave portion are in contact with each other, the flatness of the front frame can be secured. A clearance between the frame and the liquid crystal display panel can be maintained. In addition, the mechanical strength of the front frame is improved due to the presence of the recess.

  According to the invention described in claim 2, since the recesses are provided at the same depth on the four sides on the peripheral side of the front frame, the flatness of the front frame is further increased, and the front frame And the liquid crystal display panel can be more stably maintained.

  According to the invention described in claims 3, 5, 6, and 7, the frame is formed with a recess at or near the rib, so that excess meat around the rib is removed. In addition, it is possible to further reduce the occurrence of sink marks due to volume shrinkage of the resin frame.

  According to the invention described in claim 4, the frame body is formed with a protruding portion that is taller than the rib at a location adjacent to the recess, and the upper surface of the protruding portion is a height that does not contact the front frame. Therefore, the protrusion does not contact the inner surface of the front frame, and as a result, only the plurality of ribs contact the bottom surface of the recess, which further increases the clearance between the front frame and the liquid crystal display panel. It can be maintained stably.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiments described below exemplify liquid crystal display devices for embodying the technical idea of the present invention, and are not intended to specify the present invention. Other embodiments included are equally applicable.

  1 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a frame provided in the liquid crystal display device of FIG. 1, and FIG. 3 is an enlarged view of a portion A in FIG. 4 is an enlarged view of part B of FIG. 2, FIG. 5 is an enlarged view of part C of FIG. 2, FIG. 6 is an enlarged view of part D of FIG. 2, and FIG. 8 is a cross-sectional view taken along line EE in FIG. 7, FIG. 9 is a cross-sectional view taken along line FF in FIG. 7, and FIG. 10 is a cross-sectional view taken along line GG in FIG. 11 is a cross-sectional view taken along line HH in FIG.

  As shown in FIG. 1, the liquid crystal display device 1 of this embodiment includes a liquid crystal display panel 2, a frame body 3, a backlight unit 4, a back case 5, and a front frame 6.

  The liquid crystal display panel 2 is a known liquid crystal display panel in which a pair of glass substrates are bonded together with a sealing material and a liquid crystal layer is formed therein, and a driver IC (not shown) for performing display control is mounted on one side surface thereof. The plurality of wiring boards 8 (TCP: Tape Carrier Package) are provided, and the wiring boards 8 are connected to a control board (not shown) on which a controller and the like are mounted. The backlight unit 4 is composed of a plurality of optical sheets (not shown), a light guide plate (not shown), and a light source (not shown). While being attached to the bottom of the optical plate, a reflection sheet (not shown) is attached so as to cover the light source, and assembled by placing a plurality of optical sheets made of a diffusion sheet, a prism sheet, etc. on the light guide plate, The description is omitted in FIG.

  Next, a method for assembling the liquid crystal display device 1 will be described below. First, the backlight unit 4 is accommodated in a box-shaped back case 5, and the frame unit 3 is covered with a frame-like frame 3. A mounting hook or the like is provided inside the frame 3, and the outside of the side wall of the back case 5 is provided. The backlight unit 4 is fixed to the back case 5 by engaging with the provided mounting holes. Next, the liquid crystal display panel 2 is placed on the frame 3, the wiring board 8 is drawn around the back surface of the back case 5, and the control board is attached to the back surface of the back case 5.

  Then, the front frame 6 is attached so as to cover the liquid crystal display panel 2, and a hook (not shown) formed on the side surface of the back case 5 is inserted into the attachment hole 6 a provided inside the side wall of the front frame 6. Thus, the front frame 6 is fixed to the back case 5. Alternatively, the front frame 6 may be fixed to the frame 3 by inserting a hook (not shown) formed on the side surface of the frame 3 into the attachment hole 6a. Further, an insulating sheet is attached so as to cover the control board and the wiring board 8 attached to the back surface of the back case 5 to protect the wiring board and the control board.

  The frame 1 and the front frame 6 of the liquid crystal display device 1 assembled in this way will be described below with reference to FIGS. First, as shown in FIGS. 1 and 7, the front frame 6 is formed in a frame shape, and concave portions 61 having predetermined widths, depths, and lengths are provided on the four sides in a side groove shape. .

  As shown in FIG. 2, the frame 3 is made of a frame-shaped resin material having a window 31 at the center, and is composed of a pair of long side frames 3a and 3c and a pair of short side frames 3b and 3d. The frame 3 is provided with a rib 34 having a predetermined height having a recess 32 having a predetermined depth and a projection 33 at an adjacent location or in the vicinity thereof. Further, a mounting surface 35 for mounting the liquid crystal display panel 2 is provided inside the frame 3 and is maintained at a predetermined height so as not to cause a display defect. The mounting surface 35 has a predetermined thickness, and holds the liquid crystal display panel 2 and forms a predetermined gap between the lower backlight unit 4 and the liquid crystal display panel 2. This prevents paddling of the liquid crystal display panel 2 due to contact with the backlight unit 4 and prevents heat generated from the backlight unit 4 from being transmitted to the liquid crystal display panel 2.

  The ribs 34 are separated at predetermined intervals and are formed at a plurality of locations. The ribs 34 are formed on both the long side frames 3a and 3c and the short side frames 3b and 3d. It may be different on the side. In this way, the ribs 34 are not formed continuously, but are formed separately, so that so-called sinks such as deformation and warpage accompanying volume contraction of the resin ribs 34 are less likely to occur, and display defects such as paddling are not caused. Will be prevented.

  At the time of assembly, the upper surface of the rib 34 contacts the bottom surface of the recess 61 of the front frame 6. By supporting the front frame 6 using such a concavo-convex configuration, the physical strength of the frame 3 can be increased, and the liquid crystal display mounted on the mounting surface 35 of the frame 3 Since it is supported at a position where it does not come into contact with the panel 2, display defects such as paddling can be prevented even when the front frame 6 is warped. Furthermore, the flatness of the front frame 6 can be obtained by maintaining the depth of the recess 61 and the height of the rib 34 at each side at predetermined values.

  FIG. 3 is an enlarged view of a portion A in FIG. Ribs 34, recesses 32, and U-shaped protrusions 33 are formed on the outer peripheral surface of the mounting surface 35 provided inside the frame 3. Since this recess 32 is formed at a location adjacent to the rib 34, excess meat of the rib 34 is removed, and the sink of the frame 3 can be made more unlikely to occur. Further, a protrusion 33 that is taller than the rib 34 is formed at a location adjacent to the recess 32, and the upper surface of the protrusion 33 is formed at a position that does not contact the front frame 6. Does not contact the inner surface of the front frame 6, and as a result, only the plurality of ribs 34 contact the bottom surface of the recess 61. Thereby, the clearance between the front frame 6 and the liquid crystal display panel 2 can be maintained more stably. In FIG. 3, a rib 34, a recess 32, and a protrusion 33 are formed in order from the mounting surface 35 outward. Further, the wiring board 8 (see FIG. 1) is routed between the plurality of ribs. Since the rib 34 and the protrusion 33 have a predetermined height with respect to the mounting surface 35, the wiring board 8 does not interfere with the rib 34.

  FIG. 4 is an enlarged view of a portion B in FIG. 2, in which a rib 34, a projecting portion 33, a recess 32, and a projecting portion 33 are formed in order from the placement surface 35 to the outside. In this configuration, since the protrusion 33 is formed in a square shape so that the recess 32 cuts out the protrusion 33, the physical strength of the frame 3 by the protrusion 33 is further increased, and the extra rib 34 is provided. Can prevent the occurrence of sink marks due to the removal of fresh meat. Moreover, since the mounting surface 35 is formed to be relatively wide, the mounting of the liquid crystal display panel 2 can be stabilized. The wiring board 8 is routed between other ribs 34 (not shown).

  FIG. 5 is an enlarged view of a portion C in FIG. 2, and a rib 34, a recess 32, and a protruding portion 33 are formed in order from the placement surface 35 outward as in FIG. 3. In this configuration, the recess 32 is formed to be relatively wide, and the excess meat of the ribs 34 is further removed, so that the occurrence of sink marks can be further prevented and the overall weight of the apparatus can be reduced.

  FIG. FIG. 3 is an enlarged view of a portion D in FIG. 2, and a protrusion 33, a recess 32, a rib 34, and a protrusion 33 are formed in order from the placement surface 35 toward the outside. In this configuration, the rib 34 is formed continuously for a relatively long time. However, since the recess 32 and the inner protrusion 33 are formed with steps, it is considered that no sink marks occur.

  Note that the protrusion 33 is located on the outer edge of the recess 61 of the front frame 6 on either side, but this is for increasing the physical strength of the frame 3 and is provided in any order. Also good.

  Next, a specific configuration of the liquid crystal display device of this embodiment will be described with reference to FIGS. 7 is a plan view showing a state in which the liquid crystal display device 1 of this embodiment is assembled, FIG. 8 is a cross-sectional view showing a state cut along line EE in FIG. 7, and FIG. 10 is a cross-sectional view showing a state cut along the line EE, FIG. 10 is a cross-sectional view showing a state cut along the line EE in FIG. 7, and FIG. 11 is a cross-sectional view taken along the line EE in FIG. It is sectional drawing which shows a state. In addition, since all show the figure cut | disconnected on the rib 34, the recessed part 32 does not appear in FIG. 8, FIG.

  FIG. 8 shows a configuration in which the liquid crystal display panel 2 is placed on the placement surface 35 and the ribs 34 and the recesses 61 of the front frame 6 are in contact with each other. Since the ribs 34 and the recesses 61 of the front frame 6 maintain a predetermined height and depth, and the surfaces thereof are secured flat, the plane of the frame 3 on which the liquid crystal display panel 2 is placed. Can hold the degree. Further, since only the ribs 34 are in contact with the front frame 6 and the protrusions 33 are not in contact with the front frame 6, the flatness is further increased. Therefore, the clearance between the front frame 6 and the liquid crystal display panel 2 can be maintained constant.

  The backlight unit 4 is located below the frame body 3 and is supported by the back case 5. Since the mounting surface 35 of the frame 3 has a predetermined thickness, the liquid crystal display panel 2 and the backlight unit 4 do not interfere with each other to cause a display defect. A cover for the control board 8 is provided below the back case 5.

  FIG. 9 shows a configuration in which a protrusion 33, a recess 32, a protrusion 33, and a rib 34 are formed in order from the outside. The liquid crystal display panel 2 is mounted on the mounting surface 35, and the rib 34 and the concave portion 61 of the front frame 6 are in contact with each other as shown in FIG. As shown in FIG. 9, since the recess 32 is formed relatively deeply, excess meat of the frame 3 is removed, and sink marks are less likely to occur.

  Further, FIG. 10 shows a configuration in which the protrusions 33 and the ribs 34 are formed in order from the outside, and other configurations are substantially the same as those shown in FIG.

  Further, FIG. 11 shows a configuration in which the projection 33, the rib 34, the recess 32, and the projection 33 are formed in order from the outside, and the other configurations are almost the same as those shown in FIG. It is.

  The characteristics of the above configuration are summarized. The box-shaped back case 5 opened upward, the backlight unit 4 disposed on the center side of the back case 5, and the peripheral side of the back case 5 are formed in a frame shape having a placement surface. A resin frame 3 is provided. Further, the liquid crystal display panel 2 placed above the backlight unit 4 and placed on the placement surface, the periphery of the liquid crystal display panel 2 and the frame 3 are covered, and fixed to the back case 5 or the frame 3. A front frame 6 is provided. The frame 3 is formed with a plurality of ribs 34 separated at predetermined intervals on the periphery. The front frame 6 has a recess 61 formed at a predetermined depth on the peripheral side. The front frame 6 is supported by bringing the rib 34 and the bottom surface of the recess 61 into contact with each other.

  As described above, according to the liquid crystal display device 1 of the present embodiment, the frame 3 is formed with a plurality of ribs 34 separated at predetermined intervals on the periphery, and the front frame 6 has predetermined intervals on the peripheral side. Since the recess 61 is formed to a depth of 50 mm, it is possible to prevent the occurrence of sink due to the volume shrinkage of the resin frame and to prevent the non-uniformity of the clearance between the front frame and the liquid crystal display panel. it can. In addition, the rib 34 and the bottom surface of the recess 61 are in contact with each other, so that the front frame 6 is supported, thereby increasing the flatness and maintaining the clearance between the front frame and the liquid crystal display panel.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention. It is a perspective view which shows the frame with which a liquid crystal display device is provided. It is the A section enlarged view of FIG. It is the B section enlarged view of FIG. It is the C section enlarged view of FIG. It is the D section enlarged view of FIG. It is a top view which shows the liquid crystal display device based on one Example of this invention. It is sectional drawing cut | disconnected by the EE line | wire of FIG. It is sectional drawing cut | disconnected by the FF line | wire of FIG. It is sectional drawing cut | disconnected by the GG line of FIG. It is sectional drawing cut | disconnected by the HH line | wire of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal display panel 3 Frame 4 Backlight unit 5 Back case 6 Front frame 32 Recess 33 Protrusion part 34 Rib 35 Mounting surface 61 Recessed part

Claims (7)

A box-shaped back case opened upward, a backlight unit arranged on the center side of the back case, and a resin made in a frame shape arranged on the peripheral side of the back case and having a placement surface A frame body, a liquid crystal display panel positioned above the backlight unit and placed on the mounting surface, the periphery of the liquid crystal display panel and the frame body, and the back case or the frame body A fixed front frame, the frame body is formed with a plurality of ribs separated at a predetermined interval on the periphery, and the front frame is provided with a recess formed at a predetermined depth on the periphery side. A liquid crystal display device, wherein the front frame is supported by contacting the rib and the bottom surface of the recess. The liquid crystal display device according to claim 1, wherein the recesses have the same depth and are provided on four sides on the peripheral side of the front frame. 2. The liquid crystal display device according to claim 1, wherein the frame body has a recess formed adjacent to or in the vicinity of the rib. The frame body is formed with a projecting portion taller than the rib at a location adjacent to the recess, and an upper surface of the projecting portion is formed at a height that does not contact the front frame. 3. A liquid crystal display device according to 3. The frame body is provided with a mounting surface for mounting the liquid crystal display panel on the inner peripheral side thereof, and the rib, the recess, and the protrusion are formed on the outer peripheral surface in order toward the outer side. The liquid crystal display device according to claim 4. The frame body is provided with a mounting surface for mounting the liquid crystal display panel on the inner peripheral side thereof, and the rib, the protruding portion, the recess, and the protruding portion are formed on the outer peripheral surface in order toward the outer side. The liquid crystal display device according to claim 4. The frame body has a mounting surface for mounting the liquid crystal display panel on the inner peripheral side thereof, and the protrusions, recesses, ribs and protrusions are formed on the outer peripheral surface in order toward the outer side. The liquid crystal display device according to claim 4, wherein the liquid crystal display device is a liquid crystal display device.

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