JP4211438B2 - Liquid crystal display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission type, that is, a liquid crystal display device having a backlight.
[0002]
[Prior art]
Liquid crystal display devices include a transmission type having a backlight and a reflection type using reflected light such as natural light and room light without having a backlight. Here, there are a direct type and a side light type as the transmission type backlight. The large-screen liquid crystal display device mainly adopts the direct method. The direct type backlight is a surface light source in which a plurality of cold cathode tube lamps are arranged directly under a liquid crystal panel.
[0003]
On the other hand, the sidelight type backlight is composed of a condensing part composed of a lamp holder having a lamp and a reflector and a light guiding part for guiding light. The condensing unit efficiently outputs the irradiation light of the lit lamp to one side surface. In addition, the light guide unit travels while totally reflecting the light from the light collecting unit into the light guide plate to form a planar light source, and a part of the light is scattered by the white dot pattern on the back surface of the light guide plate to obtain a flat surface. It is taken out on the surface as a light source.
[0004]
By the way, the life of the lamp is exhausted by long-term use. At that time, it is necessary to replace the lamp. To do so, the main body must be disassembled and the entire backlight unit containing the lamp must be removed. This is common to transmissive liquid crystal display devices such as a direct type and a side light type.
[0005]
In Patent Document 1, in a structure in which a liquid crystal panel constituting a liquid crystal display device and a backlight structure thereof are stacked, the shape structure of the lower frame or the reflection is prevented so that the liquid crystal panel is not pushed up by the backlight. Provided is a liquid crystal display device that suppresses ripple-like display defects generated on the screen of the liquid crystal panel in the vicinity of the mounting portion of the liquid crystal display device due to keyboard operation or other external impact by improving the structure of the plate Yes.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-117084
[Problems to be solved by the invention]
However, the upper frame (front frame), the lower frame (backlight unit), and the reinforcing member (housing) of Patent Document 1 are fixed with screws. Therefore, when the lamp is cut and replaced, the screw must be removed to remove the lower frame, and the upper frame and the reinforcing member are also removed. As a result, the liquid crystal panel is also detached, and it takes much time to reassemble.
[0008]
In addition, when the upper frame, the lower frame, and the reinforcing member are overlapped and screwed, the screw holes may not match and shift.
[0009]
In view of the above problems, an object of the present invention is to provide a liquid crystal display device in which a lamp can be easily replaced by adopting a structure in which a lamp can be removed while a front frame and a housing are fixed. It is another object of the present invention to provide a liquid crystal display device that can be fixed even if the front frame and the backlight unit are slightly displaced.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a liquid crystal module comprising a liquid crystal display sandwiched between a backlight unit and a front frame, and a housing to which the liquid crystal module is fixed via a mounting support. In the display device, the backlight unit includes a frame-shaped side frame forming a side surface, a back plate that covers an opening of the side frame opposite to the liquid crystal display, and a lamp attached to the side frame. An upper surface frame having a substantially L -shaped cross section is provided between the side frame and the front frame, the front frame, the upper surface frame and the side frame are screwed together , and the liquid crystal module is mounted on the mounting support The back plate is screwed to the side frame while being attached to the side frame.
[0011]
With this configuration, the lamp can be easily removed because the lamp can be removed by removing only the back plate while the front frame and the housing are fixed.
[0012]
According to the present invention, in the liquid crystal display device described above, the front frame covers the side surface of the side frame and is provided with a through hole on the side surface, and a through hole is provided in a portion overlapping the through hole of the front frame of the mounting support. A bobbin-shaped nut is provided on the side frame side of the through hole, screwed from the mounting support side, and the back plate is bent so as to cover part of the side surface of the side frame. And the notch is loosely fitted to the nut.
[0013]
In this way, since the bobbin-shaped nut is loosely fitted in the notch of the back plate, it can be fixed even if the front frame and the backlight unit are slightly displaced, the assembling work becomes easy, and the assembling time is shortened. .
[0014]
In the above liquid crystal display device, the front frame and the side frame can be screwed, and the side frame and the back plate can be screwed.
[0015]
With this configuration, if the screw on the back plate is removed while the front frame and the housing are screwed, only the back plate can be removed, and the lamp can be easily replaced.
[0016]
In the liquid crystal display device described above, a space in which a nut can be arranged may be provided on the side surface side between the upper surface frame and the side surface frame . Furthermore, the front frame, the top frame, and the side frame may be screwed, and the side frame and the back plate may be screwed.
[0017]
Further, in the above liquid crystal display device, the attachment support portion may form the side surface of the housing.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. The present invention can be applied to a transmissive liquid crystal display device. In the present embodiment, a liquid crystal display device having a direct type backlight will be described as an example.
[0019]
1A is a plan view of the front frame, FIG. 1B is a side view of the front frame, FIG. 1C is a bottom view of the front frame, FIG. 2 is a side view of the back plate, and FIG. 4 is a sectional view taken along the line BB of FIG. 1, FIG. 5 is a sectional view taken along the line CC of FIG. 1, FIG. 6A is a side view of the nut, and FIG. 7 is a plan view of the nut, FIG. 7A is a side view of the other nut, FIG. 7B is a plan view of the other nut, and FIG. 8 is a view with the back plate removed in FIG.
[0020]
As shown in FIG. 1, the front frame 11 of the liquid crystal display device has a substantially rectangular frame shape, and an opening 12 is formed in the size of the liquid crystal screen. And the front frame 11 is shape | molded by the shape which bent the outer edge part of the frame to the back side, ie, a cross section, L shape. As a result, the front frame has a front surface portion 11a shown in a plan view and a side surface portion 11b shown in a side view. The front frame 11 can be integrally formed by metal molding or resin molding.
[0021]
The front frame 11 has a plurality of through holes. Through holes 11c (12 in FIG. 1) through which screws for fixing to a backlight unit (to be described later) are formed are formed in the front surface portion 11a, and through holes through which screws for fixing to a housing (to be described later) are passed are formed in the side surface portion 11b. Holes 11d (12 in FIG. 1) are formed. The shape of the through holes 11c and 11d is not particularly limited, and may be, for example, a circle or a long axis circle.
[0022]
The front frame 11 is fixed to the backlight unit. At this time, a back plate 20 which is opposed to the front frame 11 and serves as the bottom of the backlight unit is provided. As shown in FIG. 2, the back plate 20 is bent at an end portion, and a side surface portion 20 a is formed so as to partially overlap the front frame 11. And the U-shaped notch 20b is formed in the part which overlaps with the through-hole 11d of the front frame 11 of this side part 20a. Further, a through hole 20c (see FIG. 3) is formed in the back plate 20 at a portion overlapping a screw hole 22b of the side frame 22 described later. The back plate 20 can be integrally formed by metal molding or resin molding.
[0023]
FIG. 3 shows the configuration of the liquid crystal display device 10 taken along the line AA in FIG. The liquid crystal display device 10 includes a liquid crystal module 30 and a housing that houses the liquid crystal module 30. For example, the casing is a resin case constituting the appearance of a notebook computer, a liquid crystal monitor, or the like. The liquid crystal module is fixed to the housing via the mounting support 40. Note that the mounting support 40 may be provided separately from the housing, or may serve as the mounting support 40 itself. The liquid crystal module 30 is arranged in the order of the liquid crystal display 50 and the front frame 11 on the front surface of the backlight unit 21, and the liquid crystal display 50 is sandwiched between the backlight unit 21 and the front frame 11.
[0024]
The backlight unit 21 includes a frame-shaped side frame 22 that forms a side surface, a removable back plate 20 that covers an opening on the side frame 22 opposite to the liquid crystal display 50, and a liquid crystal display 50 on the side frame 22. A translucent reinforcing plate 23 covering the side opening and the side frame 22 on the liquid crystal display 50 side, sandwiching the reinforcing plate 23 between the side frame 22 and liquid crystal between the front frame 11. An upper frame 24 that holds the display 50 and a lamp 25 attached to the side frame 22 are provided.
[0025]
In addition, it is desirable to provide a reflecting plate (not shown) or the like on the back plate 20 and the side frame 22 on the lamp 25 side so that light is used effectively.
[0026]
On the front side of the side frame 22, a screw hole 22a is formed in a portion overlapping the through hole 11c of the front frame 11, and on the back side of the side frame 22, a screw hole 22b is formed in a portion overlapping the through hole 20c of the back plate 20. Form. Then, the side frame 22 and the back plate 20 are screwed with screws 60. The fixing means for the back plate 20 is not limited to the screw 60, and may be a fitting type, for example.
[0027]
The upper frame 24 is a substantially L-shaped frame that covers a part of the front surface and side surfaces of the side frame 22. A through hole 24 a is formed in the upper surface frame 24 at a portion overlapping the through hole 11 c of the front frame 11 and the screw hole 22 b of the side frame 22. Then, the front frame 11, the upper surface frame 24, and the side frame 22 are screwed with screws 61.
[0028]
The side frame 22 and the top frame 24 can be integrally formed by metal molding or resin molding.
[0029]
The reinforcing plate 23 is a support that prevents the liquid crystal display 50 from being bent, and has a plate thickness of about 2 to 3 mm and is made of a light-transmitting resin such as acrylic or polycarbonate. It is also possible to add a light diffusion function by processing the surface of the reinforcing plate 23.
[0030]
The lamp 25 is supported by a lamp support 27 (see FIGS. 4 and 5) attached to the side frame 22 and an O-ring 26 fitted into the outer periphery of the lamp 25. As the lamp 25, for example, a cold cathode fluorescent lamp can be used. The lamp support 27 and the O-ring 26 are preferably made of an elastic body such as rubber in order to prevent the lamp 25 from being damaged. A lead wire 25 a from the lamp 25 passes through the lamp support 27 and the side frame 22 and is guided to the back side of the back plate 20.
[0031]
The liquid crystal display 50 includes a liquid crystal panel in which liquid crystal is sealed between two glass substrates with transparent electrodes, and a polarizing plate attached to the front and back surfaces of these glass substrates.
[0032]
A through hole 40 a is formed on the side surface of the mounting support 40 at a portion overlapping the through hole 11 d of the front frame 11. A bobbin-like nut 62 is loosely fitted into the notch 20b of the back plate 20. Then, a screw 63 is inserted from the outside of the mounting support 40 and fixed with a nut 62 through the through holes 40a and 11d. Thereby, the attachment support body 40 and the front frame 11 are fixed. Since the front frame 11 is fixed to the backlight unit 21 as described above, that is, the liquid crystal display device 10 is integrated.
[0033]
Since the nut 62 is loosely fitted in the notch of the back plate 20 in this way, the front frame 11 and the backlight unit 21 can be fixed even if they are slightly displaced, the assembling work is facilitated, and the assembling time is shortened. The
[0034]
Here, the nut 62 may have a shape shown in FIGS. The nut 62a in FIG. 6 has circular flanges on both sides, and has a straight portion at a portion that contacts the back plate 20. In this case, the notch 20b of the back plate 20 abuts on the nut 62a, so that the nut 62a can be prevented from idling when the screw is detached. Moreover, the nut 62b of FIG. 7 has the flange which cut off the circular flange with the parallel straight line on both sides. In this case, since the straight portion of the flange comes into contact with the side frame 22 and the top frame 24, it is possible to prevent idle rotation at the time of screw removal.
[0035]
In the operation of replacing the lamp 25 in the liquid crystal display device 10 having the above-described configuration, as shown in FIG. At this time, the other screws 61 and 63 do not need to be loosened.
[0036]
【The invention's effect】
According to the present invention, since the back plate of the backlight unit is only fixed to the side frame, if the screws of the back plate are removed while the front frame and the housing are screwed, only the back plate can be removed and the lamp can be easily replaced. Can do.
[0037]
Further, according to the present invention, since the bobbin-shaped nut is loosely fitted in the notch of the back plate, it can be fixed even if the front frame and the backlight unit are slightly displaced, the assembling work becomes easy, and the assembling time is increased. Shortened.
[Brief description of the drawings]
FIG. 1 is a plan view (a), a side view (b), and a bottom view (c) of a front frame of the present invention.
FIG. 2 is a side view of the back plate of the present invention.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along line BB in FIG. 1. FIG.
5 is a cross-sectional view taken along line CC in FIG. 1. FIG.
FIG. 6 is a side view (a) and a plan view (b) of the nut of the present invention.
FIG. 7 is a side view (a) and a plan view (b) of another nut of the present invention.
8 is a view with the back plate removed in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Liquid crystal display device 11 Front frame 11c, 11d, 20c, 24a, 40a Through hole 12 Opening part 20 Back plate 20b Notch 21 Backlight unit 22 Side frame 23 Reinforcement plate 24 Upper surface frame 25 Lamp 30 Liquid crystal module 40 Case 50 Liquid crystal Indicator 60, 61, 63 Screw 62, 62a, 62b Nut

Claims (4)

In a liquid crystal display device comprising a liquid crystal module in which a liquid crystal display is sandwiched between a backlight unit and a front frame, and a housing to which the liquid crystal module is fixed via a mounting support, the backlight unit has a side surface A frame-shaped side frame, a back plate that covers an opening of the side frame opposite to the liquid crystal display, and a lamp attached to the side frame , the side frame and the front frame, An upper surface frame having a substantially L -shaped cross section is provided between the front frame, the upper surface frame, and the side frame, and the back plate is mounted on the side surface with the liquid crystal module attached to the mounting support. A liquid crystal display device characterized by being screwed to a frame. The front frame covers the side surface of the side frame and has a through hole on the side surface side, a through hole is provided in a portion overlapping the through hole of the front frame of the mounting support, and the side frame of the through hole of the front frame A bobbin-shaped nut is provided on the side, screwed from the mounting support side, the back plate is bent so as to cover a part of the side surface of the side frame, and a notch is provided in a portion overlapping the nut The liquid crystal display device according to claim 1, wherein the notch is loosely fitted to the nut. The liquid crystal display device according to claim 1 , wherein a space in which the nut can be disposed is provided between the upper surface frame and the side surface frame on a side surface side . The liquid crystal display device according to claim 1, wherein the mounting support portion forms a side surface of the housing.

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