JP5144470B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a support member that holds or positions a backlight or an optical member.

  A liquid crystal display device includes a liquid crystal display panel having a liquid crystal layer and electrodes for applying an electric field to the liquid crystal, a backlight having a light source such as a fluorescent tube or a light emitting diode that illuminates the liquid crystal display panel from the back side, and the liquid crystal display An optical member is disposed between the panel and the backlight, and includes an diffusing plate or the like for uniformizing illumination light from the backlight. A support member that holds or positions the fluorescent tube or the optical member is attached to the frame member that houses the fluorescent tube.

As a method of attaching such a support member to the frame member, as shown in Patent Document 1, an opening is formed in the frame member, and a fixed plug is inserted into the opening, or the fixed plug is snap-fit. There are ways to use the fasteners.
US Pat. No. 7,192,149

However, when the portion protruding from the back surface of the frame member is large like a fixed plug such as a snap-fit fastener, it is difficult to reduce the thickness of the liquid crystal display device. As a method for solving such a problem, as shown in Patent Document 2 and FIG. 1, an L-shaped leg portion 6 is used as a means for fixing the support member to the frame member. Also, as in Patent Document 3 or 4, the frame member is provided with two fitting holes and a holding hole connected thereto, the engaging portion is inserted into the fitting hole, the support member is rotated, and the engaging portion is engaged with the holding hole. There has also been proposed a method for arranging and fixing.
JP 2007-189013 A JP 2001-248613 A JP 2007-180006 A

  Reference numeral 3 provided on the support member 1 shown in FIG. 1 is an optical member positioning means, and reference numeral 4 exemplifies a fluorescent tube holding means. Reference numeral 2 denotes a main body of the support member, to which an optical member positioning means 3, a fluorescent tube holding means 5, an L-shaped leg 6 and the like are attached. This main body is usually formed of a plate-like body.

  In the method of fixing the support member 1 shown in FIG. 1, an L-shaped leg portion 6 is inserted into an opening 11 formed in the frame member DFR, and the support member is formed along the surface of the frame member in which the opening is formed. Is moved in one direction (right side in the figure) to fix the support member 1. In FIG. 1, the tip 7 of the L-shaped leg is configured to engage with a recess 12 formed on the back surface of the frame member DFR so that the support member 1 is not easily detached from the frame member. Yes.

  A liquid crystal display device using the support member 1 shown in FIG. 1 is shown in FIG. FIG. 2 shows a part of a cross-sectional view of the liquid crystal display device. The liquid crystal display panel PA, a fluorescent tube FL that illuminates the liquid crystal display panel, and a space between the liquid crystal display panel and the fluorescent tube are shown. An optical member OS that is arranged and uniformizes illumination light from the fluorescent tube, a frame member DFR that accommodates the fluorescent tube, and a frame member that is attached to the backlight member or the optical member. And a support member 1 for performing the above. Further, between the frame member DFR and the support member 1, a reflection sheet RS that reflects light from the fluorescent tube FL is disposed.

  As described above, in the configuration in which the opening is formed in the frame member in order to fix the support member, the illumination of the fluorescent tube leaks to the back side of the frame member through the opening, and the luminance of this portion decreases. The problem arises. Further, there also arises a problem that foreign matters such as dust and insects enter the inside of the frame member from the outside through the opening.

  The problem to be solved by the present invention is a liquid crystal that solves the above-described problems and can suppress the leakage of backlight light to the back side of the frame member and the entry of foreign matter into the inside of the frame member. It is to provide a display device.

  In order to solve the above problems, the liquid crystal display device according to the present invention has the following characteristics.

(1) A liquid crystal display panel, a backlight that illuminates the liquid crystal display panel, and an optical member that is disposed between the liquid crystal display panel and the backlight and uniformizes illumination light from the backlight The backlight includes a plurality of fluorescent tubes, a frame member that accommodates the fluorescent tubes, and a support member that is attached to the frame member and holds or positions the fluorescent tube or the optical member. In the display device,
The frame member has a protrusion formed without a through hole in the frame member,
The support member is formed with engaging means for engaging with the protrusion.

(2) In the liquid crystal display device according to (1), the protrusion is formed by drawing a frame member.

(3) In the liquid crystal display device according to (2), the cross-sectional shape of the protrusion is a mushroom shape.

(4) In the liquid crystal display device according to (3), the engaging means is an opening formed in the support member, and the mushroom-shaped head of the protrusion can pass through the opening. A liquid crystal display device, wherein a first opening and a second opening that cannot penetrate are formed continuously.

(5) In the liquid crystal display device according to the above (3), the engaging means forms an opening into which the protrusion is inserted into the support member, protrudes to the inside of the opening, and contacts the protrusion. It is comprised from the some junction part which touches.

(6) In the liquid crystal display device according to (3), the engaging means forms an opening for inserting the protrusion in the support member, projects inside the opening, and extends in the vertical direction. It is characterized by comprising a plurality of joints having bent portions provided.

(7) In the liquid crystal display device according to the above (3), the engaging means forms an opening for inserting the protrusion in the support member, protrudes inside the opening, and has an inverted U-shape. It is comprised from the several junction part which has the following bending part.

  According to the present invention, since the frame member has the protrusion formed without having the through hole, the support member is supported by utilizing the protrusion by providing the support member with the engaging means that engages with the protrusion. The member can be fixedly disposed on the frame member. In addition, since there is no opening penetrating the frame member, it is possible to suppress the backlight illumination from leaking out to the back side of the frame member and foreign matters entering the inside of the frame member.

  Further, by forming the projections by drawing the frame member, the projections can be formed without forming the through holes in the frame member.

  Furthermore, by making the cross-sectional shape of the projection part a mushroom shape, it becomes possible to securely hold the support member on the frame member in cooperation with the engaging means of the support member.

  The engaging means is an opening formed in the support member, and the opening includes a first opening through which the mushroom-shaped head of the protrusion can penetrate and a second opening through which the penetration is impossible. It is easy to insert the protrusion into the opening and move the opening and the protrusion relative to the portion where the head of the protrusion cannot penetrate in the opening. It is possible to fix the support member to the frame member.

  In addition, the engaging means is formed of a plurality of joints that form an opening for inserting the protrusion in the support member, project inside the opening, and come into contact with the protrusion. By attaching the support member to the frame member so that is positioned inside the opening of the support member, both can be easily fixed.

  In addition, the engaging means is formed of a plurality of joints having an opening for inserting the protrusion in the support member, projecting inside the opening, and having a bent portion extending in the vertical direction. Thus, the support member can be more easily inserted into the protruding portion.

  Furthermore, the engaging means is formed of a plurality of joints that form an opening for inserting the protrusion in the support member, project inside the opening, and have an inverted U-shaped bent part. The main body portion of the support member can be placed against the frame member or the reflection sheet, and the support member can be stably fixed.

  Hereinafter, the liquid crystal display device of the present invention will be described in detail using preferred examples.

FIG. 10 is a schematic configuration diagram of a liquid crystal display device to which the present invention is applied.
First, the liquid crystal display panel PA, the optical sheet OS, and the backlight BL are sequentially arranged from the viewer side.

  The liquid crystal display panel PA includes a pair of substrates SUB1 and SUB2 made of, for example, glass arranged in parallel, and liquid crystal is sealed between the substrates SUB1 and SUB2.

  Pixels (not shown) arranged in a matrix are formed on the surface of the substrates SUB1 and SUB2 on the liquid crystal side, and the light transmittance of the liquid crystal can be controlled for each of these pixels.

  Then, an area in which each pixel is formed is defined as a liquid crystal display area AR (area surrounded by an alternate long and short dash line in the figure), and light from the backlight BL is irradiated over the entire area of the liquid crystal display area AR and transmitted through each pixel. The viewer is made to recognize the image through light.

  Substrate SUB1 disposed rearward as viewed from the viewer side has, for example, portions exposed from substrate SUB2 on the left side and the upper side in the drawing, and in these portions, one side of a plurality of driver substrates SCDh and SCDv The parts are connected. These driver substrates SCDh and SCDv are formed by a so-called tape carrier system, and are configured by mounting a semiconductor chip CH on the upper surface of a flexible substrate FB on which wiring is formed.

  Each of these driver substrates SCDh and SCDv is a circuit for driving each pixel independently. For example, the driver substrate SCDv arranged in parallel in the y direction in the figure is a scanning signal drive circuit, and is a driver arranged in parallel in the x direction in the figure. The substrate SCDh is a video signal driving circuit.

  The printed circuit board PCB is connected to the plurality of driver boards SCDh that are video signal driving circuits on the other side opposite to the side connected to the board SUB1, and an external input signal is input through the printed circuit board PCB.

  The plurality of driver boards SCDv, which are scanning signal driving circuits, are provided with a board corresponding to the printed circuit board PCB because an external input signal is inputted through a wiring (not shown) formed on the surface of the board SUB1. Not.

  On the back surface of the liquid crystal display panel PA thus configured, a backlight BL is disposed via an optical sheet means (optical member) OS made of a laminated body such as a prism sheet and a diffusion plate. The optical member OS diffuses and collects light from the backlight BL and guides it to the liquid crystal display panel PA side.

  The backlight BL is referred to as a so-called direct type, and has a configuration in which a plurality of fluorescent tubes FL as light sources are arranged in parallel in a box-shaped housing (frame member DFR).

  FIG. 9 is a part of a cross section in the y direction of the liquid crystal display device of FIG. As shown in FIG. 9, the liquid crystal display device according to the present invention includes a liquid crystal display panel PA, a fluorescent tube FL, and a liquid crystal display panel PA and the fluorescent tube FL, and illumination light from the backlight. An optical member OS for equalizing, a frame member DFR that accommodates the fluorescent tube FL, and a support member 1 that is attached to the frame member and holds or positions the fluorescent tube FL or the optical member OS. Have. Note that a reflection sheet RS that reflects the light from the fluorescent tube FL may be disposed between the frame member FL and the support member 1.

  As shown in FIG. 9, the feature of the present invention is that the frame member DFR has a protrusion 4 formed without a through hole, and the support member 1 is an engagement means that engages with the protrusion 4. Is formed. As described above, since there is no opening that communicates the inside and the back side of the frame member DFR, the backlight illumination leaks to the back side of the frame member DFR, or foreign matter enters the inside of the frame member DFR. Is also suppressed. Reference numeral 2 denotes a main body constituting the support member 1, and various members for holding or positioning the fluorescent tube FL or the optical member OS are arranged in the main body, as in the example shown in FIG. ing. Further, as will be described later, the main body 2 is also formed with engaging means for engaging with the protrusion 4.

  FIG. 3 is an enlarged view of the arrangement relationship between the protrusion 4 formed on the frame member DFR and the main body 2 of the support member 1. The frame member is usually formed of a metal plate such as steel, and the protrusion 4 having no through hole or opening is formed by drawing the frame member. In order to ensure that the engaging means (the main body portion indicated by reference numeral 2 in FIG. 3) that engages with the protrusion 4 maintains the engagement, the shape of the protrusion 4 is as shown in FIG. Preferably, the cross-sectional shape is set to a mushroom shape. Such a drawing process can be easily realized by a plurality of drawing processes using a plurality of types of dies. In addition, when the frame member is press-molded from the metal plate, simplification of the manufacturing process can be realized by simultaneously forming the protrusion 4 as well. FIG. 3A is a plan view of the head of the mushroom-shaped protrusion as viewed from above.

  4 to 8 are diagrams for explaining various engaging means provided on the support member 1, particularly the main body 2. 4 shows a first embodiment relating to the engaging means, FIG. 5 shows a second embodiment, FIGS. 6 and 7 show a third embodiment, and FIG. 8 shows a fourth embodiment.

  The engagement means 20 of Example 1 in FIG. 4 is formed with an opening for inserting the protrusion 4 in the support member (main body 2), projects inside the opening and abuts against the protrusion. It is comprised from the junction part 201 of this. As shown in FIG. 4B, by inserting the projection 4 of the frame member DFR into the opening of the main body 2 where the junction 201 is formed, the tip of the junction 201 is attached to the constricted portion of the projection 4. It is arranged and engagement can be performed more reliably.

  The engaging means of the second embodiment in FIG. 5 are openings 21 and 22 formed in the support member (main body part 2), and the opening is the first through which the mushroom-shaped head of the protrusion 4 can penetrate. One opening 21 and a second opening 22 that cannot be penetrated are continuously formed. Due to the shape of the opening, the protrusion 4 is inserted into the first opening 21 which can be penetrated as shown in FIG. 5B, and then the main body of the support member as shown in FIG. 5C. The support member can be securely fixed to the frame member by sliding the portion 2 in the direction of the arrow A and disposing the protrusion 4 in the second opening 22 that cannot be penetrated.

  Further, by making the opening width of the portion connected from the second opening 22 to the first opening 21 slightly narrower than the thickness of the constricted portion of the protrusion 4, the protrusion 4 in the second opening 22 is formed. It is also possible to configure so as not to easily move to the first opening 21 side.

  6 and 7 show the engagement means 23 of the third embodiment, and particularly show an example in which the shape of the joint portion 201 of the first embodiment is modified. In the third embodiment, the engaging means 23 forms an opening for inserting the protrusion 4 in the support member (main body 2), and has a bent portion that protrudes inside the opening and extends in the vertical direction. It has a plurality of joint portions 231.

  When the protrusion 4 is arranged inside the engaging means 23, the joint is once outward (radial direction) of the opening so that the head (mushroom-shaped head) of the protrusion can pass. Moving. In FIG. 4, since the joint portion 201 extends on the radiation of the opening, it is difficult for the joint portion to move in the radial direction (the direction along the bottom surface of the frame member DFR). Since a joint portion 231 having a bent portion as shown in FIG. 7 is provided in 23, it is possible to bend in the radial direction. FIG. 6B shows a state in which the support member (main body portion 2) is arranged and fixed on the frame member FL.

  However, as shown in FIG. 7, in Example 3, the main body 2 of the support member and the frame member DFR are in contact with each other only by the engaging means 23, so that the support member is reliably and stably on the frame member DFR. It is difficult to maintain 1. In addition, it is difficult to reduce the thickness of the liquid crystal display device. For this reason, as shown in FIG. 8, it is preferable that at least a part of the main body portion 2 excluding the engaging means 24 has a portion that can contact the frame member DFR. The fluorescent tube holding means, the optical component positioning means, and the like are preferably arranged on the main body 2 close to or in contact with the frame member.

  The engaging means of the fourth embodiment shown in FIG. 8 has an opening for inserting the protrusion 4 in the support member (main body 2), projects inside the opening, and has an inverted U-shaped bent portion. It is comprised from the some junction part 241-243. In the engaging means 24, the reverse U-shaped joining parts 241 to 243 are used, and the most part of the main body part 2 of the support member can come into contact with the frame member (reflective sheet when a reflective sheet is arranged). It is configured as follows. As described above, it is possible to secure a large number of portions to be grounded with the frame member, and it is also possible to arrange various attachment means and positioning means close to the frame member. FIG. 8B is a cross-sectional view taken along arrow XX in FIG.

  With regard to the engagement means shown in the first, third, or fourth embodiment, the engagement state can be maintained as long as there is at least one joint (claw), but more preferably three or more openings are provided. It is possible to stably arrange the projection of the frame member at the center of the frame.

  As described above, according to the present invention, it is possible to provide a liquid crystal display device capable of suppressing leakage of backlight light to the back side of the frame member and entry of foreign matter into the inside of the frame member. It becomes possible.

It is a figure which shows the supporting member 1 using the conventional L-shaped leg part. It is sectional drawing of the liquid crystal display device which uses the conventional supporting member 1. FIG. It is a figure explaining the engagement condition of the frame member used for the liquid crystal display device which concerns on this invention, and a supporting member. It is a figure of Example 1 explaining the engaging means of the supporting member used for the liquid crystal display device which concerns on this invention. It is a figure of Example 2 explaining the engaging means of the supporting member used for the liquid crystal display device which concerns on this invention. It is a figure of Example 3 explaining the engaging means of the supporting member used for the liquid crystal display device which concerns on this invention. It is a cross-sectional perspective view which shows the engagement state of the engaging means shown in FIG. 6, and a projection part. It is a figure of Example 4 explaining the engaging means of the supporting member used for the liquid crystal display device which concerns on this invention. It is sectional drawing of the liquid crystal display device which concerns on this invention. 1 is an overall configuration diagram of a liquid crystal display device according to the present invention.

Explanation of symbols

1 Support member 2 Main body (support member)
3 Optical member positioning means 4 Protrusion 5 Fluorescent tube holding means 6 L-shaped legs 20, 23, 24 Engaging means 21, 22 Opening (engaging means)
PA Liquid crystal display panel OS Optical member DFR Frame member RS Reflective sheet FL Fluorescent tube

Claims (4)

A liquid crystal display panel, a backlight that illuminates the liquid crystal display panel, and an optical member that is disposed between the liquid crystal display panel and the backlight and uniformizes illumination light from the backlight; In the liquid crystal display device, the backlight includes a plurality of fluorescent tubes, a frame member that accommodates the fluorescent tubes, and a support member that is attached to the frame member and holds or positions the fluorescent tube or the optical member. ,
The frame member has a protrusion formed without a through hole in the frame member,
The support member is formed with an engagement means for engaging with the protrusion,
The protrusion is formed by drawing the frame member,
The cross-sectional shape of the protrusion is a mushroom shape,
The engaging means is an opening formed in the support member, and the opening includes a first opening through which the mushroom-shaped head of the protrusion can penetrate and a second opening through which the penetration is impossible. A liquid crystal display device characterized by being formed continuously. A liquid crystal display panel, a backlight that illuminates the liquid crystal display panel, and an optical member that is disposed between the liquid crystal display panel and the backlight and uniformizes illumination light from the backlight; In the liquid crystal display device, the backlight includes a plurality of fluorescent tubes, a frame member that accommodates the fluorescent tubes, and a support member that is attached to the frame member and holds or positions the fluorescent tube or the optical member. ,
The frame member has a protrusion formed without a through hole in the frame member,
The support member is formed with an engagement means for engaging with the protrusion,
The protrusion is formed by drawing the frame member,
The cross-sectional shape of the protrusion is a mushroom shape,
The engaging means is formed of a plurality of joints that form an opening into which the protrusion is inserted into the support member, project inside the opening, and abut against the protrusion. Liquid crystal display device. A liquid crystal display panel, a backlight that illuminates the liquid crystal display panel, and an optical member that is disposed between the liquid crystal display panel and the backlight and uniformizes illumination light from the backlight; In the liquid crystal display device, the backlight includes a plurality of fluorescent tubes, a frame member that accommodates the fluorescent tubes, and a support member that is attached to the frame member and holds or positions the fluorescent tube or the optical member. ,
The frame member has a protrusion formed without a through hole in the frame member,
The support member is formed with an engagement means for engaging with the protrusion,
The protrusion is formed by drawing the frame member,
The cross-sectional shape of the protrusion is a mushroom shape,
The engaging means is formed of a plurality of joints that form an opening into which the protrusion is inserted into the support member, projecting inside the opening, and having a bent portion extending in the vertical direction. A liquid crystal display device. A liquid crystal display panel, a backlight that illuminates the liquid crystal display panel, and an optical member that is disposed between the liquid crystal display panel and the backlight and uniformizes illumination light from the backlight; In the liquid crystal display device, the backlight includes a plurality of fluorescent tubes, a frame member that accommodates the fluorescent tubes, and a support member that is attached to the frame member and holds or positions the fluorescent tube or the optical member. ,
The frame member has a protrusion formed without a through hole in the frame member,
The support member is formed with an engagement means for engaging with the protrusion,
The protrusion is formed by drawing the frame member,
The cross-sectional shape of the protrusion is a mushroom shape,
The engaging means is formed of a plurality of joint portions that form an opening for inserting the protrusion in the support member, project inside the opening, and have an inverted U-shaped bent portion. A liquid crystal display device.

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