JP2006258887A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which the positioning of a liquid crystal display panel is correctly performed and also the area of a non-display area is small and a display area is large with respect to the outside dimension of the main body of the liquid crystal display device. <P>SOLUTION: The liquid crystal display device is equipped with; a liquid crystal display panel 1; and a frame-shaped holding case 10 which consists of a plurality of frame pieces 11a to 11d holding the liquid crystal display panel 1, and the liquid crystal display device is characterized in that a mounting base 12 on which the peripheral part of the liquid crystal display panel 1 is to be mounted is formed in the inner side of the frame pieces 11a to 11d, and side walls 14a to 14d are erected vertically from respective peripheral sides of a face on which the panel 1 is to be mounted of the mounting base 12 so as to be abutted on side faces of the panel 1, and, in the mounting base 12, elastic parts 20a, 20b respectively composed of a hollow part 21a and a hollow part 21b are formed at inner sides near positions where the side walls 14a to 14d are erected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display device, and in particular, a liquid crystal in which a non-display area is reduced by devising a shape of a holding case for holding a liquid crystal display panel, thereby increasing a display area with respect to the outer dimensions of the liquid crystal display apparatus body. The present invention relates to a display device.

  Conventionally, a liquid crystal display panel in a liquid crystal display device is housed in a rear case and a front frame with an outer peripheral portion fixed by a resin holding case. The liquid crystal display panel is positioned by a holding case so that the display area is accurately positioned on the display window of the front frame.

  Since this holding case is made of resin, a clearance is provided in consideration of expansion and contraction due to temperature changes in the usage environment. However, after assembly, the liquid crystal display panel moves due to some external factor such as vibration. Display area may be displaced from the display window of the front frame. However, various methods for solving such problems have already been devised, and are also introduced in patent publications (see, for example, Patent Documents 1 and 2).

  6 is a plan view showing a display panel holding frame disclosed in Patent Document 1, and FIG. 7 is a diagram showing a display device disclosed in Patent Document 2. FIG. FIG. 7B is a partial perspective view, and FIG.

  As shown in FIG. 6, a liquid crystal panel holding frame 101 disclosed in the following Patent Document 1 includes a panel fixing plate 102 that supports a liquid crystal panel that displays an image, and a support member 103 that supports the panel fixing plate 102 ( Or a case) and an elastic member 106 that joins the end of the panel fixing plate 102 and the opening of the support member 103. The shape of the elastic member 106 is, for example, a hollow shape of an oval 107 so that it can be easily followed by deformation under load. Thereby, the liquid crystal panel holding frame 101 disclosed in the following Patent Document 1 can obtain sufficient elasticity for the elastic member, and can reduce the impact and vibration applied to the liquid crystal panel.

Further, the liquid crystal display device 150 disclosed in the following Patent Document 2 is formed by fixing a display panel 152 such as a liquid crystal panel or a plasma display panel to an apparatus housing 158 as shown in FIG. The device housing 158 is formed by connecting upper and lower covers 181 and 182, and a display window 180 having a size substantially matching the display area of the display panel 152 is opened on the upper cover 181. In the attached state to the housing 158, the display panel 152 is biased toward the adjustment screw 154 provided on the screw receiving portion 160 by the elastic restoring force of the leaf spring 153 provided on the spring receiving portion 161. It is held in a predetermined posture in a state where the side wall is sandwiched between the tip of the shaft portion 154 and the leaf spring 153. When the lighting test is performed in this state and the display area of the display panel 152 is shifted from the display window 180 of the upper cover 181, the position of the display panel 152 can be adjusted by adjusting the adjustment screw 154. With the above configuration, the liquid crystal display device disclosed in Patent Document 2 described below can adjust the displacement of the display panel with a simple structure, and thus can improve manufacturing efficiency.
JP-A-9-5722 (paragraphs [0010] to [0011], [0016]) JP 11-190974 A (paragraphs [0009], [0011], [0017])

  However, in the prior art disclosed in Patent Documents 1 and 2, since the holding case or the leaf spring and the adjusting screw are located on the same plane with respect to the liquid crystal display panel, the outer peripheral portion of the liquid crystal display panel is covered. The area of the frame-like non-display area increases, and the size of the liquid crystal display device itself increases. This problem is particularly problematic when the installation area of the liquid crystal display device is limited. For example, when the liquid crystal display device is used for in-vehicle use, the display area of the liquid crystal display device cannot be increased.

  In view of the above problems, the present inventors have made various studies to obtain a liquid crystal display device in which the liquid crystal display panel can be accurately positioned and the non-display area of the liquid crystal display device itself is small. It has been found that if the liquid crystal display panel is held by this holding case provided on a different plane from the display panel, and a side wall is provided on the holding case, all of the above problems can be solved. .

  That is, an object of the present invention is to provide a liquid crystal display device that accurately positions the liquid crystal display panel, has a small non-display area, and has a large display area with respect to the external dimensions of the liquid crystal display device body. .

In order to achieve the above object, a liquid crystal display device according to claim 1 of the present invention includes a liquid crystal display panel and a frame-shaped holding case made of a plurality of frame pieces for holding the liquid crystal display panel. A device,
A mounting table on which the peripheral portion of the liquid crystal display panel is mounted is formed inside the frame piece, and a side wall is perpendicular to each periphery of a surface of the mounting table on which the liquid crystal display panel is mounted. It is erected so as to be in contact with the side surface of the display panel, and the mounting table is formed with an elastic structure having a hollow structure on the inner side near the position where the side wall is erected.

  The invention according to claim 2 relates to the liquid crystal display device according to claim 1, wherein the elastic structure is provided on one adjacent two sides of the plurality of frame pieces. To do.

The invention according to claim 3 relates to the liquid crystal display device according to claim 1 or 2, wherein the side wall has one or more protrusions for pressing the side surface of the liquid crystal display panel against the inner side surface thereof. The invention according to claim 4 relates to the liquid crystal display device according to claim 1 or 2, wherein the side surface of the side wall facing the hollow structure has a front side. A protrusion-shaped holding table on which a peripheral part of the liquid crystal display panel is mounted is provided at the same height as the mounting table.

  The invention according to claim 5 relates to the liquid crystal display device according to claim 2, wherein the two adjacent sides of the liquid crystal display panel have the elastic structure out of the frame pieces. The two adjacent sides of the liquid crystal display panel are pressed by the two side walls provided with the elastic structure in the frame piece while being in contact with the two side walls not provided. In the state, it is fixed in the holding case.

  The invention according to claim 6 relates to the liquid crystal display device according to any one of claims 1 to 5, wherein at least one of the side walls provided upright on the frame piece provided with the elastic structure. A protective wall is provided on the outside via another hollow structure.

  By providing the above configuration, the present invention has the following excellent effects. That is, according to the first aspect of the present invention, in the liquid crystal display device, the mounting table on which the peripheral portion of the liquid crystal display panel is mounted is formed inside the holding case, and the side wall is in contact with the side surface of the liquid crystal display panel. An elastic structure having a hollow structure is formed on the inside of the mounting table close to the position where the side wall is erected, so that the liquid crystal display panel is pressed by pressing the liquid crystal display panel with the side wall. Since the liquid crystal display panel is fixed and can prevent displacement, only the side wall is provided on the same plane of the liquid crystal display panel, and the elastic structure is achieved by the hollow structure provided on the mounting table. The area of the frame portion can be reduced without providing an elastic structure in the frame portion (non-display area) that surrounds the outer periphery of the device. For example, the installation area is limited as in an in-vehicle liquid crystal display device. Possible to provide a liquid crystal display device which can also secure a wide display area in a case where there.

  Further, the invention of claim 2 can achieve the effect of claim 1 even when the elastic structure is provided only on one adjacent two sides of the frame piece, and therefore when the holding case is processed. Can be omitted.

  In the invention of claim 3, by providing a protrusion on the inner side surface of the side wall, the liquid crystal display panel is pressed by this protrusion, so that the liquid crystal display panel can be fixed more firmly than pressing the entire side wall. it can.

  In the invention of claim 4, the physical strength of the side wall itself can be improved by the protruding holding base inside the side wall having an elastic structure.

  According to a fifth aspect of the present invention, one adjacent two sides of the liquid crystal display panel are in contact with the side wall of the frame piece not provided with an elastic structure, and the other two adjacent sides of the liquid crystal display panel are provided with an elastic structure. Since the frame is pressed by the side wall of the frame piece and fixed in the holding case, the side wall of the frame piece provided with this elastic structure can be easily deformed to attach and remove the liquid crystal display panel. It can be carried out.

  In the invention of claim 6, a protective wall is provided on the outer side of at least one of the side walls of the frame piece provided with an elastic structure through a hollow structure, so that an external impact is prevented by the protective wall. Since the side wall is surrounded by the hollow structure, the liquid crystal display panel can be fixed more flexibly without any obstacle to deformation of the side wall.

  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 in are equally applicable.

  FIG. 1 is a plan view showing a holding case of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is an enlarged view of each part of the holding case, and FIG. 2 (a) is an enlarged view of part A of FIG. FIG. 2 (b) is an enlarged view of the main portion showing the portion B of FIG. 1 in an enlarged manner, FIG. 3 is a sectional view of the holding case, and FIG. 3 (a) is a cross-sectional view taken along the line CC in FIG. FIG. 3B is a sectional view taken along the line DD in FIG. 2, FIG. 4 is a plan view showing a state where the liquid crystal display panel is mounted on the holding case, and FIG. 5 is a sectional view taken along the line EE in FIG.

  The liquid crystal display device of the present invention includes at least a liquid crystal display panel 1, a backlight unit, a back case, and a front frame. However, since these are known ones, description thereof is omitted here, and only the holding case 10 used in the liquid crystal display device will be described below.

  As shown in FIG. 1, the holding case 10 is composed of a plurality of (here, four) frame pieces 11a to 11d. The frame pieces 11a to 11d have a pair of long sides 11a and 11c and a pair of the same. It consists of short sides 11b and 11d and forms a frame-like frame. These are formed of an elastic resin material, and a central portion serves as a window 13 for irradiating the liquid crystal display panel 1 with light from a backlight unit (not shown). A mounting table 12 on which the peripheral part of the liquid crystal display panel 1 is mounted is formed in a frame shape on the inner portions of the frame pieces 11a to 11d, and the mounting table 12 is mounted on the mounting table 12 described above. Side walls 14 a to 14 d are vertically erected so as to surround the mounting table 12. The side walls 14a to 14d are set to a height at which the liquid crystal display panel 1 can be securely fixed, and the lengths of the side walls 14a to 14d are appropriately set to a length capable of stably fixing the liquid crystal display panel 1. The wall thickness is thin enough to fix the liquid crystal display panel 1.

  Of the frame pieces 11a to 11d, the short side 11b is located on the outer side surface of the wiring board (not shown) of the liquid crystal display panel 1 when the liquid crystal display panel 1 is placed. A notch 15 having a width substantially the same as the width of is provided. Further, on the outside of the pair of long sides 11a and 11c, when the holding case 10 is fixed in the liquid crystal display device, protective walls 16a and 16c are provided for protecting the liquid crystal display panel 1 from an external impact or the like. The protective walls 16a and 16c are provided higher than the side walls 14a to 14d and wider.

  Next, the structure of one long side 11a and one short side 11b of the holding case 10 will be described with reference to FIGS.

  Among the frame pieces 11a to 11d of the holding case 10, one long side 11a and one short side 11b are respectively provided with elastic portions 20a for mounting the liquid crystal display panel 1 as shown in FIGS. , 20b are provided. Since the elastic portions 20a and 20b have substantially the same configuration, the elastic portion 20b having the short side 11b will be described below as a representative. As shown in FIG. 2 (a), a part of the elastic portion 20b is enlarged, and the mounting table 12 of the frame piece 11b has a hollow portion 21b on the inner side near the position where the side wall 14b is erected. The outer portion of the side wall 14b is provided with a cutout 15. As a result, the side wall 14b has a relatively higher elasticity in the horizontal direction than the other portions. As shown in FIG. 2B, the elastic part 20a of the long side 11a is similarly provided with a hollow part 21a on the inner side close to the position where the side wall 14a on the mounting table 12 is erected. By forming another hollow portion 21a ′ between the side wall 14a and the protective wall 16a, the side wall 14a has relatively high elasticity in the horizontal direction. 1 to 2 are hatched for easy understanding of the hollow portions 21a, 21b, 21a '.

  Further, as shown in FIGS. 2A and 3, projections 22b and 22b (22a and 22a) for pressing and fixing the liquid crystal display panel 1 with a larger elastic force are provided on the side wall 14b (14a). 14a) inside. The protrusions 22b and 22b (22a and 22a) are provided at a predetermined number, for example, four (only two of them are shown in FIG. 2A) at a predetermined interval, and are integrated with the side wall 14b (14a). Molded. Further, the side wall 14b (14a) is provided with a semicircular holding table 23b (23a) on the inner side surface thereof at the same height as the adjacent mounting table 12 on which the peripheral portion of the liquid crystal display panel 1 is mounted. The holding base 23b (23a) is integrally formed with the side wall 14b (14a), thereby improving the strength of the elastic portion 20b (20a) itself. The hollow portion 21b (21a) is partially curved in a semicircular shape in accordance with the shape of the holding base 23b (23a).

  A process of placing the liquid crystal display panel 1 in the holding case 10 having the above-described configuration will be described with reference to FIGS.

  In the liquid crystal display panel 1 placed on the holding case 10, liquid crystal is sealed between at least a pair of substrates 2a and 2b having different sizes and bonded together with a sealing material. Is mounted with an IC chip 3 for controlling the transparent electrode for driving the liquid crystal. When the liquid crystal display panel 1 is attached to the holding case 10, first, the corner of the liquid crystal display panel 1 is placed on the placement table 12 at the intersection where the long side 11 c and the short side 11 d intersect. And in the state which mounted this corner | angular part, it fixes by pushing in while pressing the protrusions 22a and 22b of the elastic parts 20a and 20b on the two sides of the board | substrate 2b located on the opposite side of this corner | angular part.

  As shown in FIG. 4, the liquid crystal display panel 1 fixed to the holding case 10 in this way has an outer peripheral edge on each of the side walls 14 c and 14 d of the two sides 11 c and 11 d of the holding case 10 and the other two. The plurality of protrusions 22a and 22b provided on the side walls 14a and 14b of the sides 11a and 11b are in contact with each other, and as shown in FIG. ) Is fixed while being sandwiched between the side walls 14c and 14d and the protrusions 22a and 22b.

  With the above-described configuration, the holding case 10 of the liquid crystal display device of the present invention is configured such that the liquid crystal display panel 1 is pressed and fixed by the elastic portions 20a and 20b, so that there is no backlash even if vibration or the like is generated from the outside. It can return to the position. Further, only the side walls 14a to 14d are provided on the same plane of the liquid crystal display panel 1, and the elastic structure is formed by providing the hollow portions 21a and 21b on the mounting table 12 on which the liquid crystal display panel 1 is mounted. Therefore, since there is no elastic structure on the outer periphery of the liquid crystal display panel 1 and the elastic structure itself is provided at a position overlapping the peripheral portion of the liquid crystal display panel 1, the display area is increased with respect to the external dimensions of the liquid crystal display device. A large liquid crystal display device can be obtained.

FIG. 1 is a plan view showing a holding case of a liquid crystal display device according to an embodiment of the present invention, 2 is an enlarged view of each part of the holding case, FIG. 2 (a) is an enlarged view of a main part showing an enlarged portion A of FIG. 1, and FIG. 2 (b) is an enlarged view of a portion B of FIG. Enlarged view of the main part, 3 shows a sectional view of the holding case, FIG. 3 (a) is a sectional view taken along the line CC in FIG. 2, FIG. 3 (b) is a sectional view taken along the line DD in FIG. FIG. 4 is a plan view showing a state where the liquid crystal display panel is mounted on the holding case, 5 is a cross-sectional view taken along line EE in FIG. FIG. 6 is a plan view showing a conventional display panel holding frame; 7A and 7B are diagrams showing a conventional display device. FIG. 7A is a perspective view of a main part, and FIG. 7B is a cross-sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 10 Holding case 11a, 11c Long side (frame piece)
11b, 11d Short side (frame piece)
12 mounting table 13 window 14a-14d side wall 15 notch 16a, 16c protective wall 20a, 20b elastic part 21a, 21b hollow part 21a 'hollow part 22a, 22b protrusion 23a, 23b holding stand

Claims (6)

A liquid crystal display device comprising a liquid crystal display panel and a frame-shaped holding case composed of a plurality of frame pieces for holding the liquid crystal display panel,
A mounting table on which the peripheral portion of the liquid crystal display panel is mounted is formed inside the frame piece, and a side wall is perpendicular to each periphery of a surface of the mounting table on which the liquid crystal display panel is mounted. A liquid crystal display, wherein the liquid crystal display is erected so as to be in contact with a side surface of the display panel, and an elastic structure having a hollow structure is formed on an inner side of the mounting table close to a position where the side wall is erected. apparatus.   The liquid crystal display device according to claim 1, wherein the elastic structure is provided on one adjacent two sides of the plurality of frame pieces.   The liquid crystal display device according to claim 1, wherein the side wall is provided with one or more protrusions for pressing the side surface of the liquid crystal display panel on an inner side surface thereof.   The side surface of the side wall facing the hollow structure is provided with a protrusion-like holding table on which the peripheral portion of the liquid crystal display panel is mounted at the same height as the mounting table. Item 3. A liquid crystal display device according to item 1 or 2.   The liquid crystal display panel is in a state in which one adjacent two sides of the liquid crystal display panel are in contact with the side walls of two sides of the frame piece where the elastic structure is not provided. The two adjacent sides of the frame piece are fixed in the holding case in a state of being pressed by the side walls of the two sides of the frame piece on which the elastic structure is provided. Liquid crystal display device. The protective wall is provided on at least one outer side of the side wall provided upright on the frame piece provided with the elastic structure via another hollow structure. The liquid crystal display device according to any one of the above.

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