JP2006047704A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display for facilitating the mounting and assembling of a support stand to a large-sized unit having weight, by forming a panel unit and a backlight unit in other units. <P>SOLUTION: The liquid crystal display comprises the panel unit PU mounted on a front face plate 11 comprising one sheet of transparent material by connecting a plurality of sheets of liquid crystal display panels P1-P4; and the backlight unit BU facing the panel unit PU and mounted on a rear face plate 20 comprising one transparent material, by connecting the same number of backlights B1-B4 corresponding to each liquid crystal display panel P1-P4. The panel unit PU and the backlight unit BU are separated from each other at a constant distance to be arranged facingly, and both side parts of the front face part and the rear face plate are supported and fixed to the support stands 40a and 40b, respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device in which a plurality of liquid crystal display panels are connected to form a single large screen.

  The liquid crystal display device is lighter and thinner than other display devices such as a display device such as a cathode ray tube (CRT) or a plasma display device (PDP), and is easy to make full color with low power consumption. Therefore, taking advantage of these advantages, a large screen is formed by connecting a plurality of liquid crystal display panels, and independent images are displayed on each screen, or the same image is displayed on all the screens. A liquid crystal display device has been developed that can display a screen by a method. (For example, refer to Patent Document 1).

  16A and 16B show a liquid crystal display device described in Patent Document 1 below, in which FIG. 16A is a front view, and FIG. 16B is a cross-sectional view taken along line AA of FIG.

  As shown in FIG. 16, the liquid crystal display device 10 ′ is composed of four liquid crystal panels PNL1 to PNL4 arranged adjacent to each other, and the four liquid crystal display panels PNL1 to PNL4 are adjacent to each other on a common plane. In addition, a plurality of linear light sources CFL are arranged on the back surface of these liquid crystal display panels PNL1 to PNL4, and both ends in the vicinity of the electrodes at the edge of the light emitting area of each linear light source CFL are bent to be substantially U-shaped. And fixed to the frame REF.

  As a specific structure, as shown in FIG. 16B, a liquid crystal display panel PNL in which liquid crystal is sealed between two transparent substrates SUB1 and SUB2 and these liquid crystal display panels PNL are irradiated. A plurality of linear light sources CFL, a back frame FLB provided with inverter relay plates INV-S1, INV-S2, and INV-S3 for supplying electric power to each linear light source CFL, and these liquid crystal display panels PNL, linear light sources A holder provided with a CFL and a frame FLF having compartmented compartments for accommodating the back frame FLB, etc., each liquid crystal display panel PNL being accommodated in the respective compartment, and the linear light source CFL being provided in the intermediate frame FLR The electrode portion of each linear light source is embedded in the HLD.

  In addition, a liquid crystal display device in which a plurality of liquid crystal display panels are mounted on a single large substrate without being housed in a plurality of housing chambers is also known, as in the liquid crystal display device described above. (For example, refer to Patent Document 2).

  17A and 17B show a liquid crystal display device described in Patent Document 2 below, in which FIG. 17A is a plan view, and FIG. 17B is a K-K ′ cross-sectional view of FIG.

In this liquid crystal display device 1, as shown in FIG. 17 (b), one side of the active matrix type color liquid crystal display panels 10 A and 10 B is adjacent and sandwiched between the two reinforcing substrates 9 A and 9 B facing each other. Then, the joined portion of each display panel 10A, 10B is fixed with a resin material. Each of the liquid crystal display panels 10A and 10B includes a TFT substrate in which thin film transistors (TFTs) are formed in a matrix and a CF substrate in which color filters CF are formed in a matrix. The liquid crystal 5 is sealed between the substrates, It has a structure in which the spacers 6 are bonded together. The reinforcing substrates 9A and 9B are formed of a large substrate having a size capable of arranging two display panels 10A and 10B.
Japanese Patent Laying-Open No. 2002-91347 (FIGS. 1 and 2, paragraphs [0039] to [0043]) JP-A-8-286204 (FIGS. 1 and 2, paragraphs [0032] to [0037])

  However, the liquid crystal display devices described in these patent documents have the following problems, respectively.

  The liquid crystal display device described in Patent Document 1 includes four liquid crystal display panels PNL, a plurality (six in the embodiment) of linear light sources CFL, a back frame FLB, and the like for each of the frames FLF. In the storage room. However, if a larger screen is required, the size of each liquid crystal display panel will increase, and the number of linear light sources will increase. Accordingly, the weight of the entire device and the heat generated from the linear light sources will be increased. The amount increases, and it is extremely difficult to support and fix the frame as described above, and it cannot cope with an increase in the amount of heat generation.

  For example, when a 40-inch type liquid crystal display panel is used, about 32 linear light sources are required to irradiate a liquid crystal display panel of this size. Then, an attempt is made to manufacture a liquid crystal display device having a large screen with four such large liquid crystal display panels, 128 linear light sources (4 × 32), and a support substrate having a plate thickness capable of supporting them. Then, the total weight becomes several hundred kilograms, and the amount of heat emitted from the 128 light sources becomes enormous, and it becomes impossible to support and fix the frame as described in Patent Document 1.

  Further, since the four liquid crystal display panels are housed in a frame having compartments that are partitioned, the frame width of the portion where the outer peripheral portions of the liquid crystal display panels are adjacent to each other becomes wide. For this reason, when one image is displayed on the entire screen, the seam of the liquid crystal display panel of each display screen appears and the image is observed in a divided state, so that the sense of unity of the screen may be impaired. .

  Furthermore, in the liquid crystal display device described in Patent Document 2, one side of two liquid crystal display panels is adjacent to each other, and is interposed between two opposing reinforcing substrates and is connected and fixed by a resin material. In order to mount the liquid crystal display panel directly on the substrate, high precision is required for processing the end face of the liquid crystal display panel and positioning on the substrate, which is an extremely difficult operation. For example, since the positioning tolerance of the liquid crystal display panel is required to be about 0.15 mm, it is very difficult to fit within such a tolerance, and advanced and skilled skills are required. It also causes a series of good products.

  Also, if the end faces of each display panel are integrally fixed to the reinforcing substrate with a resin material at the joint of the liquid crystal display panel, the individual liquid crystal display panel cannot be removed alone, and the failed display panel can be replaced or replaced alone. Maintenance becomes impossible. Further, in this liquid crystal display device, a backlight is mounted with a polarizing plate interposed on one reinforcing substrate. Such a backlight is mounted on the outer peripheral portion of two display panels. Is limited to a device having a relatively small screen such that the backlights are arranged adjacent to each other, and if a larger screen is to be formed, the backlight cannot be mounted directly below the substrate. The reason is that when the size is increased, the weight of the large liquid crystal display device and the amount of heat released cannot be accommodated.

  Furthermore, the liquid crystal display device uses a hot cathode fluorescent tube, a cold cathode fluorescent tube, or the like as a light source of the backlight, and the number of the liquid crystal display device increases as the screen size increases. Then, for example, 128 lines are required, and the power supply design for supplying power to these fluorescent tubes is not easy, and various problems appear.

  That is, since a large number of fluorescent tubes require an inverter for each fluorescent tube, the large liquid crystal display device requires 128 inverters for 128 fluorescent tubes. For this reason, those installation spaces increase, it is difficult to secure a wiring space, and there are problems such as an increase in the size of the backlight unit.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to support a heavy-duty large unit by forming the panel unit and the backlight unit as separate units. An object of the present invention is to provide a liquid crystal display device that facilitates mounting and assembly of a base.

  Furthermore, another object of the present invention is to provide a liquid crystal display in which display unevenness at a joint portion obtained by connecting a plurality of liquid crystal display panels is reduced.

In order to achieve the above object, the invention of the liquid crystal display device according to claim 1 comprises:
A panel unit that is attached to a front plate made of a transparent material by connecting a plurality of liquid crystal display panels, and the same number of backlights corresponding to the liquid crystal display panels facing the panel unit. A backlight unit mounted on a back plate made of a transparent material of
The panel unit and the backlight unit are arranged to face each other at a predetermined distance, and both side portions of the front plate and the back plate are supported and fixed by a support base, respectively.

  A second aspect of the present invention relates to the liquid crystal display device according to the first aspect, wherein each of the liquid crystal display panels is mounted on a front surface or a back surface of the front plate, and each of the backlights is a front surface of the back plate. Or it is equipped with the back surface.

Invention of Claim 3 is related with the liquid crystal display device of Claim 1 or 2,
The support base is composed of a substantially trapezoidal support substrate and a mounting substrate standing upright from one surface of the support substrate, and the outer side surface of the mounting substrate is fixed in contact with the front plate and the back plate. It is characterized by that.

  The invention according to claim 4 relates to the liquid crystal display device according to claim 3, wherein the mounting substrate is formed of two substrates facing each other at a predetermined interval from one surface of the support substrate, These attachment substrates are mounted on the support substrate in an adjustable manner.

  A fifth aspect of the invention relates to the liquid crystal display device according to the first aspect of the invention, wherein the backlight unit is characterized in that an auxiliary light source is disposed at a joint between the backlights.

  The invention according to claim 6 relates to the liquid crystal display device according to claim 5, wherein the auxiliary light source is attached to a base material made of a reflective material, and a part of the outer periphery of the auxiliary light source is covered with a diffusion plate, The base material is disposed along a seam of the backlight unit.

  According to the first aspect of the present invention, when the device has an ultra-large screen, its total weight is several hundred kilograms. In this device, the panel unit and the backlight unit are separate units. Therefore, each unit can be assembled individually, making it easy to manufacture, and after assembling each unit, both units can be fixed with a support base, so that each heavy unit can be easily transported and the device can be assembled. It will also be easy.

  Further, since each unit is a separate unit, the distance between the backlight unit and the panel unit can be changed, and the heat radiation from the backlight can be easily adjusted. In other words, as the liquid crystal display device becomes very large, the amount of heat generated from a plurality of backlights during driving becomes enormous, but the distance between each unit is adjusted and heat is dissipated using this space. It can be carried out. For this reason, display unevenness of the liquid crystal display panel due to the heat generation of the backlight can be reduced, and further adverse effects on peripheral components can be prevented.

  According to the invention of claim 2, a liquid crystal display panel is mounted on the front or back surface of the front plate, and a backlight is mounted on the front or back surface of the back plate. Therefore, it is possible to improve the heat radiation design and display quality.

  For example, when a liquid crystal display panel is mounted on the front plate surface and a backlight is mounted on the back surface of the back plate, no backlight is interposed between the front plate and the back plate. Therefore, even if the heat from the backlight is transmitted to the front surface side of the back plate through the back plate, it can be hardly transmitted to the liquid crystal display panel mounted on the front plate surface. In addition, it is not necessary to determine the distance between the front plate and the rear plate mainly for heat dissipation measures, and the adjustment of the distance can be performed mainly for display quality, for example, to prevent shadows on the rear plate from appearing on the display screen. It becomes possible. Further, since the gap between the front plate and the back plate can be widened, the light diffusing member or the auxiliary light source can be easily arranged between them.

  In addition, when a liquid crystal display panel is mounted on the back of the front plate and a backlight is mounted on the surface of the back plate, the backlight is interposed between the front plate and the back plate. By adjusting, the above-described effects can be achieved.

According to the invention of claim 3, the support base is composed of a substantially trapezoidal support base and a mounting base which stands upright at a right angle from one surface thereof, and has a simple structure and stably supports and fixes a heavy unit. It becomes possible to do.

According to the invention of claim 4, in addition to the effect of claim 3, the brightness of the display screen can be adjusted by adjusting the distance between the opposing substrates, and the heat released from the backlight can be easily adjusted. Become.

  According to the invention of claim 5, by arranging the auxiliary light source at the seam of each backlight, the non-light emitting area of the seam portion is eliminated, so that the luminance unevenness of the display screen can be reduced.

  According to the invention of claim 6, the auxiliary light source along the seam of the backlight is normally a linear light source. However, with only this linear light source, the light emission width is narrow and uneven brightness occurs. By covering a part with a diffusion plate, the irradiation can be made uniform. That is, if only the auxiliary light source is provided, the shape of the auxiliary light source may be seen through the display screen or uneven brightness may occur. For example, by covering the light source with a bowl-shaped diffusion plate, these disadvantages may be avoided. Can be resolved.

  Further, by arranging the auxiliary light source on the base material made of the reflective material, the auxiliary light source can be easily attached, and the base material made of the reflective material can be used for efficient irradiation.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a liquid crystal display device for embodying the technical idea of the present invention, and is not intended to specify the present invention for this liquid crystal display device. Other embodiments within the scope of the claims are equally applicable.

  1A and 1B show a liquid crystal display device according to a first embodiment of the present invention, in which FIG. 1A is a front view, FIG. 1B is a side view as viewed from an arrow A in FIG. FIG. 2A is an external perspective view of the panel unit, FIG. 2B is a plan view of one liquid crystal display panel constituting the panel unit, and FIG. 2C is FIG. ) Of FIG. 2 is an exploded perspective view of the panel unit of FIG. 2A, and FIG. 4 is an AA sectional view of FIG. 2A.

  As shown in FIGS. 1, 2, and 3, the liquid crystal display device 10 includes a panel unit PU in which four liquid crystal display panels P <b> 1 to P <b> 4 are attached to one front plate 11 and fixed by a pressing plate 12; A backlight unit BU having four backlights B1 to B4 corresponding to the respective liquid crystal display panels P1 to P4 mounted on one back plate 20, and a light source between the panel unit PU and the backlight unit BU. The units PU and BU are erected so as to be opposed to each other with a predetermined interval through the diffusion member DP and the auxiliary light source SB, and both sides of each unit PU and BU are fixed by a pair of support bases 40a and 40b. It has a configuration.

  Hereinafter, the panel unit PU, the light diffusing member DP, the backlight unit BU, and the support bases 40a and 40b constituting the liquid crystal display device 10 will be described.

  As shown in FIGS. 2 and 3, the panel unit PU is arranged such that the outer peripheral portions of the four liquid crystal display panels P <b> 1 to P <b> 4 are adjacent to a large front plate 11 made of a transparent material and fixed with a pressing plate 12. It has a configuration.

  The front plate 11 has a substantially rectangular shape and is formed of a plate thickness and a material that does not bend even when the four liquid crystal display panels P1 to P4 are mounted and has mechanical strength that is strong against vibrations. For example, when four 40-inch (101.6 cm) liquid crystal display panels are connected to form an 80-inch (about 203.2 cm) large screen, considerable mechanical strength is required. The thickness of the face plate 11 is preferably about 15 mm. The front plate material is preferably acrylic resin.

  Further, the four liquid crystal display panels P1 to P4 have the same structure, and the attachment position of the wiring board TCP is different when they are connected. One of the liquid crystal display panels PN (N = 1, 2, 3, 4) is a rear glass substrate on which a thin film transistor (TFT) is mounted, as shown in FIGS. Liquid crystal LC is sealed between the AR and the front glass substrate CF on which the color filter is mounted, and a rear polarizing plate F1 is attached to the rear surface of the rear glass substrate AR, and a front polarizing plate F2 is attached to the front surface of the front glass substrate CF. .

  The liquid crystal LC is sealed in the space formed by the front surface of the rear glass substrate AR, the rear surface of the front glass substrate CF, and the adhesive seal material SL. Therefore, in the liquid crystal display panel PN, the peripheral areas where the adhesive seal material SL is provided become the non-display areas NE and NE ′, and the inner areas surrounded by the non-display areas NE and NE ′, that is, the liquid crystal LC The enclosed area becomes the display area Pn. Incidentally, the non-display area NE 'in the part where the wiring board TCP is provided is wider than the non-display area NE in the part where the wiring board TCP is not provided. This is because the non-display area NE in the outer peripheral portion where other liquid crystal display panels are provided in close proximity is processed to be shorter than the other parts (that is, the non-display area NE ′), so that the width is different. .

  Further, the liquid crystal display panel PN is connected to a wiring substrate TCP (Tape Carrier Package) in which a driving integrated circuit is mounted on a flexible substrate made of polyimide or the like at two edge portions of the outer peripheral portion. Further, a light diffusing member DP having substantially the same size as that of the pressing plate 12 is provided on the back surface of the pressing plate 12 of the panel unit PU, and the light diffusing member DP is constituted by a known laminated body such as a lens sheet and a diffusion sheet. Is done.

  Next, a method for assembling the panel unit PU will be described with reference to FIGS.

  The panel unit PU uses four liquid crystal display panels PN having the above-described structure, and as shown in FIG. 3, first, an auxiliary substrate 15 made of a transparent material is used. Openings 15a and 15b large enough to accommodate the liquid crystal display panels P1 and P4 are provided, the auxiliary substrate 15 is placed on the pressing plate 12, and the liquid crystal display panel P1 is placed in each of the openings 15a and 15b. , P4. When such an auxiliary substrate is used, the display panel can be easily positioned and fixed.

  After mounting the two liquid crystal display panels P1 and P4 on the diagonal line in the auxiliary substrate 15, the opening 17a capable of accommodating the other two liquid crystal display panels P2 and P3 in the same procedure as the auxiliary substrate 15. , 17b, the liquid crystal display panels P2, P3 are placed. However, since the liquid crystal display panels P1 and P4 placed on the auxiliary substrate 15 are placed on the upper left and lower right in the figure, the liquid crystal display panels P2 and P3 placed on the auxiliary substrate 17 are The openings 17a and 17b of the auxiliary substrate 17 are provided so as not to overlap with the liquid crystal display panels P1 and P4, that is, in the lower left and upper right in the drawing. Thus, by installing the liquid crystal display panels P1 to P4 using the auxiliary substrates 15 and 17, replacement and maintenance of the liquid crystal display panel are facilitated.

  After the four liquid crystal display panels P1 to P4 are arranged as described above, the liquid crystal display panels P1 to P4 are placed on the back surface 11b of the front plate 11 and sandwiched between the press plates 12 to fix them. For this fixing, it is preferable to fix the pressing plate 12 using a detachable fixing means. Accordingly, of the four liquid crystal display panels P1 to P4, the two liquid crystal display panels P1 and P4 are arranged through a step without any seam hitting the diagonal line, so that the other two liquid crystal display panels P2 and P3 are also arranged through a step without diagonally joining the seam, and when viewed from the side, the two liquid crystal display panels P1 and P2 are arranged in two stages, and the other two liquid crystal display panels P3, P4 is also arranged in two stages.

  That is, as shown in FIG. 4, the two liquid crystal display panels P <b> 2 and P <b> 4 are not joined at the closest sides of the liquid crystal display panels, and the non-display areas NE do not overlap. Similarly, in the other two liquid crystal display panels P1 and P3, the closest sides are not joined to each other and are not stepped, and the non-display areas NE do not overlap.

  Therefore, the parallax (difference in distance when the liquid crystal display device is viewed from the front) between the first-stage liquid crystal display panels P1 and P4 and the second-stage liquid crystal display panels P2 and P3 on the holding plate 12 is one stage. The total thickness of the front glass substrate of the eye and the back glass substrate of the second stage, that is, substantially the same as the thickness of one liquid crystal panel excluding the polarizing plate. Further, the length of the non-display area of the seam is almost twice the non-display area NE of the seam portion of each liquid crystal display panel. However, the non-display area NE of the joint portion of each of the liquid crystal display panels P1 to P4 is provided to be as small as possible than the non-display areas of the other peripheral portions. For example, the non-display area NE of the joint portion has a peripheral edge. It is about half the size of the non-display area.

  If it is arranged like the above display panel, each liquid crystal display panel can be positioned and fixed with high accuracy, and any liquid crystal display panel can be easily replaced or maintained independently. Moreover, since each liquid crystal display panel P1-P4 is arrange | positioned in two steps with a level | step difference, since the end surfaces which each display panel opposes do not collide, the chip | tip of an end surface can be prevented. In this embodiment, four liquid crystal display panels are used. However, the number is not limited to four, and the number of the liquid crystal display panels may be less than or greater than that.

  In the following, a panel unit PU 'that can reduce the width of the non-display area by partially cutting off the corners facing each of the display panels P1 to P4 will be described as a modification of the liquid crystal display panel.

  FIG. 5 shows a panel unit of this modification, FIG. 5A is an external perspective view, FIG. 5B is a plan view of one liquid crystal display panel constituting the panel unit, and FIG. FIG. 5B is an xx cross-sectional view, FIG. 6 is an exploded perspective view of the panel unit of FIG. 5A, and FIG. 7 is a BB cross-sectional view of FIG.

  Since the front plate 11 and the holding plate 12 are the same as those described above, the same reference numerals are given, and detailed descriptions thereof are omitted. In the liquid crystal display panels P1 to P4 used here, as shown in FIG. 5 (b), portions where the display panels face each other, that is, a corner located at the center of the panel is cut off at an angle of 45 degrees. The cut end face PS (hereinafter referred to as cut portion) PS is a liquid crystal display panel (P1 and P4 in the figure, or P2 in the figure) positioned on the diagonal line when the panel unit PU ′ is assembled as shown in FIG. A combination of P3).

  Next, a method for assembling the panel unit PU 'will be described.

  First, the cut portions PS of the liquid crystal display panels P1 and P4 located on the diagonal line are brought into contact with each other, and the rectangular auxiliary substrate 15A having a thickness equal to the thickness of the liquid crystal display panel and side lengths of LA and LB. , 15B are provided so as to come into contact with the sides of the liquid crystal display panels P1 and P4 where the sides are joined, where the TCP is not provided. Further, the liquid crystal display panels P2 and P3 are assembled together with the auxiliary substrates 17A and 17B by the same method so that the liquid crystal display panels P2 and P3 do not overlap the liquid crystal display panels P1 and P4. The two-stage liquid crystal display panels assembled in this way are stacked and sandwiched between the front plate 11 and the pressing plate 12 to assemble the panel unit PU '.

  The cutouts PS of the liquid crystal display panels P1 to P4 are preferably provided in the vicinity of the display area as shown in FIG. 5, and the liquid crystal display panel is arranged so that the outer peripheral part is adjacently provided by providing such cutouts PS. The cross-shaped non-display area P0 (see X1 and Y1 in FIG. 12) of P1 to P4 can be reduced. More specifically, in the panel unit PU shown in FIG. 4, the width (Y1) of the non-display area in the vertical direction is the width of the combined area of the non-display areas NE of the liquid crystal display panels P2 and P4. In the panel unit PU ′ shown in FIG. 2, the non-display area NE of the liquid crystal display panel P4 located at the rear in the figure overlaps the liquid crystal display panel P2 located at the front in the figure, so that the width (Y1) of the actual non-display area is This is the width corresponding to one non-display area NE of the liquid crystal display panel P2 (P3) located in the front in the figure. For this reason, the width (Y1) of the non-display area of the panel unit PU 'can be suppressed to about half that of the panel unit PU. Although the width (Y1) of the non-display area in the vertical direction has been described here, the width of the non-display area in the horizontal direction can be similarly reduced.

  In addition, the panel unit PU ′ assembled in this way reduces the risk of the panel or the auxiliary substrate itself shifting due to the weight of the liquid crystal display panel itself, etc., by providing the cut-out portions PS in the liquid crystal display panels P1 to P4. In addition, since the auxiliary substrate can be a rectangular plate as described above, processing of the auxiliary substrate is facilitated.

  Further, although the panel unit PU (PU ′) includes a plurality of liquid crystal display panels using an auxiliary substrate, the liquid crystal display panels may be connected to each other without using the auxiliary substrate.

  FIG. 8 shows a panel unit PU ″ in which four liquid crystal display panels are connected to each other without using an auxiliary substrate as another modified example, FIG. 8A is an external perspective view, and FIG. 8B is a panel. FIG. 8C is a cross-sectional view taken along line yy of FIG. 8B, FIG. 9 is an exploded perspective view of the panel unit of FIG. 8A, and FIG. 10 is a cross-sectional view taken along the line C-C in FIG.

  The four liquid crystal display panels used in this modification have the same structure as the liquid crystal display panels P1 to P4. Therefore, in order to simplify the description, the same reference numerals are used for explanation. As shown in FIG. 8C, each liquid crystal display panel encloses a liquid crystal LC between a rear glass substrate AR on which a thin film transistor is mounted and a front glass substrate CF on which a color filter is mounted, and the rear surface of the rear glass substrate AR. And a front polarizing plate F2 on the front surface of the front glass substrate CF. And wiring board TCP is connected to the edge part of two sides which are not close to other liquid crystal display panels among each sides of the perimeter part of a liquid crystal display panel.

  When the four liquid crystal display panels P1 to P4 are connected to each other, the liquid crystal display panels P1 to P4 are arranged so that the respective sides of the outer peripheral portion to which the wiring board TCP is not connected are in contact with each other, and the front plate 11 is pressed. The plate 12 is sandwiched and held. With this configuration, the panel unit PU ″ can be formed without using the auxiliary substrate that supports the liquid crystal display panels P1 to P4, the number of components can be reduced, and the panel unit PU ″ can be reduced at a low cost. Can be manufactured. Incidentally, for example, two of the four display panels P1 and P4 are arranged so that one corner is substantially in contact with each other on a diagonal line that is lower right in FIG. Next, the other display panels P2 and P3 are arranged upside down on the diagonal line that crosses the diagonal line, and is sandwiched between the front plate 11 and the holding plate 12, and the wiring of each panel P2 and P3 is arranged. It is also possible to connect the four panels P1 to P4 so as to be positioned on the outer peripheral edge of the panel unit to which the substrate TCP is connected. By connecting together in this way, it is not necessary to prepare a liquid crystal display panel with a different mounting position of the wiring board TCP, and this panel unit PU "can be manufactured with only one type of liquid crystal display panel, and the liquid crystal display can be manufactured at a lower cost. The device can be manufactured.

  Next, the backlight unit BU will be described with reference to FIGS. 1, 11, 12 (b), and 13.

  11 shows a backlight unit, FIG. 11 (a) is a plan view of the backlight unit, and FIG. 11 (b) is a perspective view showing one backlight constituting the backlight unit of FIG. 11 (a). FIG. 11C is a zz cross-sectional view of FIG. 11B, and FIG. 12B is a plan view of a state where an inverter is connected to the backlight.

  As shown in FIGS. 1 and 11, the backlight unit BU has four backlights B1 to B4 corresponding to the four liquid crystal display panels P1 to P4, respectively, and a size capable of mounting these backlights. It consists of a back plate 20.

  The back plate 20 has substantially the same size as the front plate 11 and has a thickness and a size that can maintain mechanical strength even when the backlight unit BU is attached. For example, it is preferable to use an acrylic plate having a thickness of 15 mm.

  The backlight unit BU is composed of four backlights B1 to B4 corresponding to the four liquid crystal display panels P1 to P4, respectively, so that the sides of the outer peripheral portion are close to each other. Each of the backlights B1 to B4 has the same structure. Each of these backlights uses a rectangular and shallow housing H having an opening slightly larger than the liquid crystal display panel PN, as shown in FIGS. 11 (b) and 11 (c). A reflector R is laid on the bottom wall of H, and a plurality of linear light sources L0 and a plurality of optical sheets (lens sheets, diffusion sheets, etc.) O are disposed above the reflector R. Yes.

  As the linear light source L0, a cold cathode fluorescent tube or a hot cathode fluorescent tube is used. As shown in FIG. 12 (b), lamp holders LH are respectively attached to both ends of each fluorescent tube. The linear light source L0 is attached to the housing H using the lamp holder. Further, lead wires are led out from the respective fluorescent tubes and connected to power sources (not shown).

  12A and 12B are explanatory diagrams for explaining the relationship between the panel unit and the backlight unit. FIG. 12A is a plan view of the panel unit, and FIG. 12B is a plan view of the backlight unit. In FIGS. 12A and 12B, the front plate and the rear plate are omitted, and in FIG. 12B, the optical sheet is also omitted.

  Since the panel unit PU is arranged so that the four liquid crystal display panels P1 to P4 are close to each other, the outer peripheral portions of the display panels P1 to P4 are arranged as shown in FIG. A cross-shaped non-display area P0 having a predetermined width at adjacent locations is formed in the effective display area. The cross-shaped non-display area P0 has a width of Y1 in the vertical direction and a width of X1 in the horizontal direction. Each width Y1, X1 corresponds to the width of the adhesive seal material SL of two adjacent liquid crystal display panels. To do. Accordingly, as shown in FIG. 4, the non-display areas X1 and Y1 have a total width of the non-display areas NE.

  The total non-display area width length 2NE is such that the width NE of each adhesive seal material SL is narrow, and each of the liquid crystal display panels P1 to P4 is connected to the joined seam portion as shown in FIG. As shown in FIGS. 16 and 17, since no resin material is used, the width is relatively narrow.

  Further, as shown in FIG. 12B, the backlight unit BU has a cross-shaped non-light-emitting area B0 having a predetermined width at a position where the outer peripheral parts of the backlights B1 to B4 are adjacent to each other. I can do it inside. This cross-shaped non-light-emitting region B0 has a width of Y2 in the vertical direction and a width of X2 in the horizontal direction. It is the length between the linear light sources (cold cathode fluorescent lamps) L0 provided at the ends, and the width length X2 is on the side of the backlight B1 (B3) and the backlight B2 (B4) adjacent to the linear light source L0. This is the length between the lamp holders LH.

  These width lengths X2 and Y2 are usually such that both ends of the linear light source L0 are supported by the lamp holder LH, and the linear light sources at both ends are fixed at positions slightly apart from the housing H. The length is relatively wide.

  Therefore, when the cross-shaped non-display area P0 in the panel unit PU is compared with the cross-shaped non-light-emitting area B0 in the backlight unit BU, the relationship between the respective width lengths Y1, Y2 and X1, X2 is Y1 <Y2. , X1 <X2.

  When the cross-shaped non-light emitting area B0 becomes large, there is no light source in the cross-shaped non-display area P0. Therefore, when the panel unit PU is irradiated with the backlight unit BU, each of the liquid crystal display panels P1 to P4. The non-display area PO at the seam portion becomes dark, resulting in variations in luminance on the display screen, making it difficult to see.

  In order to eliminate such inconvenience, the auxiliary light source unit SB is disposed at the joint of the backlight unit BU.

  13A and 13B show a backlight unit to which an auxiliary light source is attached. FIG. 13A is a plan view, and FIG. 13B is a cross-sectional view taken along the line DD in FIG.

  As shown in FIG. 13, the auxiliary light source L1 includes two linear light sources from the outer periphery of the backlight unit BU toward the center along the joints of the backlights B1 to B4 of the backlight unit BU. Arrange in pairs. Each auxiliary light source L1 is attached by a predetermined fixture (not shown) within the joint width of the backlight unit BU using the lamp holders LH at both ends.

  Around the outer periphery of the backlight unit BU, a power source IV (inverter) for lighting each linear light source is disposed, and the power source IV and each auxiliary light source L1 are connected. The number of light sources is not limited to two, and one or a plurality of light sources may be provided in accordance with the joint width length.

  Further, it is preferable to cover a part of the outer periphery of the auxiliary light source L1 with the diffusion plate 32. By covering the auxiliary light source L1 with the diffusion plate 32, it becomes difficult to see the shape of the light source, and the light emitted from the light source can be diffused to uniformly irradiate the cross-shaped non-display area P0 of the liquid crystal display panel. Furthermore, it is preferable that the diffusion plate 32 has a structure in which a diffusion sheet, a lens film, or the like is wound.

  Further, the auxiliary light source L1 may be directly attached to the joint portion of the backlight unit BU, and as shown in FIG. 13B, the width of the auxiliary light source L1 is substantially equal to the non-light emitting area of the joint on the surface side of the backlight unit BU. A base material (hereinafter simply referred to as a reflective material) 33 made of a long reflective material may be provided, and an auxiliary light source unit in which an auxiliary light source is disposed on the reflective material 33 may be provided. By doing in this way, attachment of an auxiliary light source becomes easy and the panel unit PU can be efficiently irradiated using a reflecting material.

  As the auxiliary light source L1, a cold cathode fluorescent tube is used, and when connected to the inverter IV of the power source, the high-voltage side output of the inverter IV is connected to the electrode of each cold cathode fluorescent tube located on the outer peripheral side of the backlight unit. Is preferred. According to this connection, the length of the lead wire led out from the high voltage side of each inverter IV is shortened, and the power of the inverter can be saved.

  Moreover, it is preferable that the lead wires at the cross-shaped center portion of the backlight unit BU are connected together.

  The linear light source is not limited to a cold cathode fluorescent tube, and a hot cathode fluorescent tube or other light source may be used. Moreover, as the shape, you may use the thing of arbitrary shapes, such as a long fluorescent tube, a U-shaped, an L-shaped fluorescent tube.

  14A and 14B are diagrams showing a support base of the liquid crystal display device of the present invention. FIG. 14A is a front view, FIG. 14B is a plan view, and FIG. 14C is a right side view.

  Each unit PU, BU is fixed by a pair of support bases 40a, 40b. Each support base 40a, 40b has the same structure, and one support base is shown as the support base 40 in FIG. Incidentally, since one support base 40b is in a position facing the other support base 40a and has the same shape, the illustration is omitted.

  The support base 40 includes a substantially trapezoidal support substrate 43 having a predetermined height and a bottom side, and mounting substrates 41 and 42 that stand up at a right angle from one surface of the support substrate 43 and have a predetermined length. It is made of a thick plate so that it can support the units PU and BU in kilograms. For example, the support substrate 43 is preferably made of an acrylic material having a height and a bottom length that are approximately one half of the height of the front plate 11 raised and a plate thickness of 20 mm.

  The mounting substrates 41 and 42 are composed of two substrates separated by a predetermined distance. These substrates 41 and 42 have a predetermined length and the outer surface of each substrate is joined to the front plate 11 and the back plate 20. Then, each unit PU, BU is fixed. Further, the number of the mounting substrates is not limited to two, but may be one, for example, or may be fixed so that it can be removed by using an integral fixing method or an arbitrary fixing means.

  When fixing so that it can be removed, it is preferable to be able to adjust the space | interval of each board | substrate. By adjusting the interval between the units, it is easy to adjust the heat dissipation of the heat emitted from the backlight, and the brightness of the display screen can be adjusted.

  The assembly of the liquid crystal display device 10 will be described with reference to FIG. 1, FIG. 2, and FIG. As an assembly method, the panel unit PU and the backlight unit BU assembled as described above are used, a pair of support bases 40a and 40b are provided on both sides of each unit PU and BU, and the units PU and BU are fixed. To do.

  When attaching the units PU and BU to the support bases 40a and 40b, first, the outer surfaces of the mounting boards 41a and 42a (41b and 42b) of the support bases 40a and 40b are brought into contact with the front plate 11 and the back plate 20, respectively. Then, the panel unit PU and the backlight unit BU are fixed. And when assembling panel unit PU and backlight unit BU, the distance between each unit is adjusted to predetermined length by changing the position of attachment board | substrate 41a, 42a (41b, 42b). The predetermined length means that if the auxiliary light source is in contact with or too close to the liquid crystal display panel, the shape of the auxiliary light source will appear as a shadow from the display screen of the front plate. Length is preferred.

  Since this distance varies depending on the size of the liquid crystal panel and the wattage, size, shape, etc. of the light source, it is preferably adjusted at the time of assembly.

  Further, in order to more reliably assemble each unit, as shown in FIG. 1, it is also possible to attach a fixing rod 45 that supports and fixes the end portions of each unit at an appropriate position.

  15A and 15B show a liquid crystal display device according to a second embodiment of the present invention, in which FIG. 15A is a front view and FIG. 15B is a side view as seen from an arrow B in FIG.

  The liquid crystal display device 101 is different from the liquid crystal display device 10 in that the liquid crystal display panel and the backlight are provided outside the front plate and the back plate, not between the front plate and the back plate. That is, in the liquid crystal display device 10 of the first embodiment, the liquid crystal display panel and the backlight are provided between the front plate and the back plate facing each other. However, the liquid crystal display device 101 of the second embodiment uses these as the front plate. It is provided outside the back plate. Therefore, the same reference numerals are given to configurations common to both apparatuses, the description thereof is used, duplicate description of the portions is omitted, and different portions are described.

  The liquid crystal display device 101 has a configuration in which the panel unit PU is mounted on the front surface 11 a of the front plate 11 and the backlight unit BU is mounted on the back surface 20 b of the back plate 20. The front plate 11 and the back plate 20 are made of a transparent material.

  As the attachment method of the liquid crystal display panels P1 to P4 to the front plate 11 and the attachment method to the backlights B1 to B4 to the rear plate 20, the method employed in the first embodiment or known attachment means is adopted. .

  A light diffusion member DP is provided on the back surface 11 b of the front plate 11. Further, an auxiliary light source SB is provided on the surface 20a of the back plate. That is, when four backlights B1 to B4 are mounted on the back surface 20b of the back plate 20, non-light emitting areas are formed at the joints of the backlights B1 to B4 on the back surface 20b side of the back plate 20. In this non-light emitting area, since the illuminance is lower on the surface 20a side of the back plate 20 as compared with the area irradiated with each backlight, the auxiliary light source is provided along the non-light emitting area from the surface 20a side of the back plate. A light source is provided. Each backlight arrangement / fixing and attachment of the auxiliary light source is the same as in the first embodiment.

  According to this configuration, since the liquid crystal display panels P1 to P4 and the backlights B1 to B4 are not disposed between the front plate 11 and the back plate 20, the heat radiation design between the front plate 11 and the back plate 20 is facilitated. . That is, even if heat from the backlight is transmitted from the back surface 20b of the back plate to the surface 20a side of the back plate through the back plate, it is hardly transmitted to the liquid crystal display panel mounted on the surface 11a of the front plate. Further, the distance between the front plate 11 and the rear plate 20 does not need to be determined mainly by heat dissipation measures. The display quality, for example, the display screen is not affected by shadows of the rear plate, and the like. Adjustment is possible. Furthermore, since the space between the front plate 11 and the back plate 20 can be widened, the light diffusing member or the auxiliary light source can be easily disposed between them.

  In the liquid crystal display device 101 of the second embodiment, the liquid crystal display panels P1 to P4 and the backlights B1 to B4 are provided outside the front plate 11 and the back plate 20 facing each other. To P4 and the backlights B1 to B4 may be mounted on the front surface 20a of the back plate 20, or the liquid crystal display panels P1 to P4 are mounted on the back surface 11b of the front plate 11 and the backlights B1 to B4 are mounted. You may mount | wear with the back surface 20b of a backplate.

  With these configurations, it is possible to achieve substantially the same operational effects as the liquid crystal display device 101.

1 shows a liquid crystal display device according to Embodiment 1 of the present invention, FIG. 1A is a front view, FIG. 1B is a side view as viewed from an arrow A in FIG. 2A is an external perspective view of the panel unit, FIG. 2B is a plan view of one liquid crystal display panel constituting the panel unit, and FIG. 2C is FIG. 2B. WW sectional view of 2 is an exploded perspective view of the panel unit of FIG. AA sectional view of FIG. FIG. 5 (a) is an external perspective view, FIG. 5 (b) is a plan view of one liquid crystal display panel constituting the panel unit, and FIG. 5 (c) is FIG. 5 (b). Xx sectional view of FIG. 5A is an exploded perspective view of the panel unit in FIG. BB sectional drawing of Fig.5 (a), FIG. 8 (a) is an external perspective view, FIG. 8 (b) is a plan view of one liquid crystal display panel constituting the panel unit, and FIG. 8 (c) is FIG. yy sectional view of b), FIG. 8A is an exploded perspective view of the panel unit of FIG. CC sectional drawing of Fig.8 (a), 11A shows a backlight unit, FIG. 11A is a plan view of the backlight unit, FIG. 11B is a perspective view showing one backlight constituting the backlight unit of FIG. c) is a zz cross-sectional view of FIG. It is explanatory drawing explaining the relationship between a panel unit and a backlight unit, Comprising: Fig.12 (a) is a top view of a panel unit, FIG.12 (b) is a top view of a backlight unit, The backlight unit which attached the auxiliary light source is shown, FIG.13 (a) is a top view, FIG.13 (b) is DD sectional drawing of Fig.13 (a), It is a figure which shows the support stand of the liquid crystal display device of this invention, FIG.14 (a) is a front view, FIG.14 (b) is a top view, FIG.14 (c) is a right view, FIG. 15A shows a liquid crystal display device according to Embodiment 2 of the present invention, FIG. 15A is a front view, FIG. 15B is a side view as seen from an arrow B in FIG. FIG. 16A shows a liquid crystal display device described in Patent Document 1, FIG. 16A is a front view, FIG. 16B is a cross-sectional view taken along line AA in FIG. FIG. 17A is a plan view and FIG. 17B is a cross-sectional view taken along the line K-K ′ of FIG. 17A.

Explanation of symbols

10, 101 Liquid crystal display devices P1 to P4 Liquid crystal display panel P0 Non-display area PU Panel unit 11 Front panel B1 to B4 Backlight B0 Non-light emission area BU Backlight unit SB Auxiliary light source 20 Rear panels 40a and 40b Support bases 41a to 42b Mounting Substrate CF Front glass substrate AR Rear glass substrate LC Liquid crystal F1, F2 Polarizing plate NE Non-display area SL Adhesive seal material Pn Display area L0 Linear light source (cold cathode fluorescent tube)
LH Lamp holder IV Inverter a, b Lead wire SBU Auxiliary light source unit L1 Auxiliary light source 30 Substrate 32 Diffusion plate 33 Base material made of a reflector (reflector)
DP Light diffusing members 41 and 42 Mounting substrate 43 Support substrate

Claims (6)

A panel unit, which is formed by connecting a plurality of liquid crystal display panels to a front plate made of a transparent material, and the same number of backlights facing the panel unit and corresponding to the liquid crystal display panels. A backlight unit mounted on a back plate made of a transparent material of
The liquid crystal display device, wherein the panel unit and the backlight unit are arranged to face each other at a predetermined distance, and both side portions of the front plate and the back plate are supported and fixed by a support base, respectively.   2. The liquid crystal display device according to claim 1, wherein each of the liquid crystal display panels is mounted on a front surface or a back surface of the front plate, and each of the backlights is mounted on a front surface or a back surface of the back plate.   The support base is composed of a substantially trapezoidal support substrate and a mounting substrate standing upright from one surface of the support substrate, and the outer side surface of the mounting substrate is fixed in contact with the front plate and the back plate. 3. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device.   The mounting substrate is formed of two substrates facing each other with a predetermined distance from one surface of the supporting substrate, and these mounting substrates are mounted on the supporting substrate in an adjustable manner. The liquid crystal display device according to claim 3.   The liquid crystal display device according to claim 1, wherein the backlight unit has an auxiliary light source disposed at a joint of the backlights.   The auxiliary light source is attached to a base material made of a reflective material, a part of the outer periphery of the auxiliary light source is covered with a diffusion plate, and the base material is disposed along a seam of the backlight unit. The liquid crystal display device according to claim 5.

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