WO2012070513A1

WO2012070513A1 - Multi-display system

Info

Publication number: WO2012070513A1
Application number: PCT/JP2011/076753
Authority: WO
Inventors: 林　啓二
Original assignee: シャープ株式会社
Priority date: 2010-11-26
Filing date: 2011-11-21
Publication date: 2012-05-31

Abstract

A multi-display system suitable for a narrow frame is provided. The multi-display system (100), which displays images by means of a plurality of liquid crystal panels (10), is provided with a plurality of liquid crystal panels (10), and light sources (20) that radiate light on the liquid crystal panels (10). The light sources (20) are housed in backlight chassis (25). Holding members (30 (31, 32)), which hold the liquid crystal panels (10), are disposed in a non-display area (55) positioned between the plurality of liquid crystal panels, and optical members (15) are bonded to the liquid crystal panels (10) on the side of the light sources (20).

Description

Multi display system

The present invention relates to a multi-display system. In particular, the present invention relates to a multi-display system (a liquid crystal display device for multi-display) capable of realizing a narrow frame corresponding to a large screen.

Note that this application claims priority based on Japanese Patent Application No. 2010-263183 filed on November 26, 2010, the entire contents of which are incorporated herein by reference. .

There has been proposed a multi-display system in which screens of a plurality of display devices are arranged close to each other and one large screen (multi-display screen) is formed by these screens (for example, Patent Document 1). A liquid crystal display device may be used as a display device constituting the multi-display system.

FIGS. 16A and 16B are diagrams for explaining the multi-display system 2000. FIG. FIG. 16A shows one liquid crystal display device 1100. The liquid crystal display device 1100 illustrated in FIG. 16A includes a display unit 110a that displays an image 150a and a frame unit 120a that is positioned on the outer edge of the display unit 110a. FIG. 16B shows a multi-display system 2000 in which one image 150b is displayed by a plurality of display units 110b.

In the multi-display system 2000 shown in FIG. 16B, the four display units 110b can be arranged two by two in the vertical and horizontal directions, and the image 150b can be displayed on a multi-display screen that has double the vertical and horizontal widths. A frame portion 120 b is provided on the outer edge of each display unit 110 b included in the multi-display system 2000. Since the frame portion 120b in the multi-display system 2000 hinders the image 150b displayed on the multi-display system screen, the frame portion 120b is preferably as narrow as possible.

JP 2009-216809 A

As described above, in the multi-display system 2000 in which a plurality of liquid crystal display devices are arranged close to each other and displayed in conjunction with each other, it is preferable that the frame portion be narrow. However, a holding mechanism for holding the optical sheet / diffusion plate is provided in the frame area at the boundary between the individual display units. If the holding mechanism is too narrow, the optical sheet / diffusion plate is There are cases where it cannot be held. That is, there is a possibility that the member of the holding mechanism is pressed and damaged by the thermal expansion of the optical sheet / diffusion plate at a high temperature. Further, at a low temperature, the optical sheet / diffusion plate may fall off the holding mechanism due to thermal contraction of the optical sheet / diffusion plate.

Therefore, if the frame portion of the multi-display system 2000 is narrow, it is preferable that the frame portion is narrow. However, in practice, there are restrictions on narrowing the frame portion. In order to narrow the frame portion of the multi-display system 2000, it is conceivable to control the amount of thermal expansion and contraction in the optical sheet / diffusion plate. The disadvantage is that the range is constrained.

The present invention has been made in view of such a point, and a main object thereof is to narrow each display unit at a joint portion when a multi-display is formed.

A multi-display system according to the present invention is a multi-display system that displays an image by a plurality of liquid crystal panels, and includes a plurality of liquid crystal panels and a light source that irradiates light to each of the plurality of liquid crystal panels. And a holding member for holding the liquid crystal panel is provided in a non-display area located between the plurality of liquid crystal panels. The light source of each of the plurality of liquid crystal panels On this side, an optical member is adhered and disposed.

In a preferred embodiment, the holding member holds the liquid crystal panel and the optical member by sandwiching the liquid crystal panel and the optical member.

In a preferred embodiment, the holding member includes a first support part that supports the surface of the liquid crystal panel, and a second support part that supports the optical member disposed on the back surface of the liquid crystal panel. The first support part and the second support part sandwich the liquid crystal panel and the optical member.

In a preferred embodiment, the liquid crystal panel has a rectangular shape, and the optical member is formed to be smaller than the liquid crystal panel, and the liquid crystal panel is formed on all four sides in the rectangular shape of the liquid crystal panel. An area where the optical member is not provided is provided, and the liquid crystal panel and the optical member are held by the holding member sandwiching the liquid crystal panel in the area where the optical member is not provided.

In a preferred embodiment, the holding member includes a first support part that supports the surface of the liquid crystal panel, and a second support part that supports the optical member disposed on the back surface of the liquid crystal panel. The first support part and the second support part sandwich the liquid crystal panel.

In a preferred embodiment, the second support portion is disposed on a peripheral portion of the backlight chassis.

In a preferred embodiment, the liquid crystal panel and the optical member are bonded via a layered adhesive substance.

In a preferred embodiment, the optical member includes at least a diffusion material.

In a preferred embodiment, the diffusing material is dispersed in a resin medium, and the diffusing material is a particle having a refractive index higher than that of the medium.

In a preferred embodiment, the diffusing material is applied to a surface on a side opposite to a surface that is in close contact with the panel of the optical material.

In a preferred embodiment, the optical member includes a diffusion layer in which the diffusion material is dispersed in a resin medium, and a transparent resin film, and one surface of the diffusion layer is formed of the transparent resin film. Bonded or laminated on one side.

In a preferred embodiment, the transparent resin film includes a plurality of concave or convex structures on the surface facing the surface in contact with the diffusion layer.

In a preferred embodiment, the light source is a backlight light source including an LED element.

In a preferred embodiment, the width of the non-display area is 10 mm or less.

In a preferred embodiment, a support pin that supports the optical member is disposed in the backlight chassis, and an impact absorbing member is provided at a tip of the support pin.

In a preferred embodiment, the optical member is a sheet-like member containing bubbles.

In a preferred embodiment, the optical member is bonded to the liquid crystal panel via the layered adhesive substance, and the layered adhesive substance contains bubbles.

According to the present invention, the holding member is provided in the non-display area located between the plurality of liquid crystal panels, and the optical member is disposed on the light source side of each of the plurality of liquid crystal panels. Since the optical member is disposed in close contact with the liquid crystal panel, the optical member can be supported by the liquid crystal panel. Therefore, even when the optical member (for example, the diffusion plate) is thermally expanded / contracted, it is possible to prevent the holding member from being deformed or the optical member from coming off, and as a result, a multi-frame suitable for narrowing the frame. A display system can be realized.

1 is a perspective view schematically showing a configuration of a multi-display system 100 according to an embodiment of the present invention. 4 is an enlarged cross-sectional view of a region 50 including a non-display region 55. FIG. (A) is sectional drawing which shows the structure of the comparative example 1000. FIG. (B) is sectional drawing which shows the structure of the multi-display system 100 of embodiment of this invention. FIGS. 9A to 9C are cross-sectional views illustrating thermal contraction / expansion of the optical member 115 in the comparative example 1000. FIG. (A) to (c) are cross-sectional views illustrating thermal contraction / expansion of the optical member 15 in the configuration of the embodiment of the present invention. 2 is a top view of the liquid crystal panel 10 in the multi-display system 100. FIG. FIG. 7 is a cross-sectional view of the multi-display system 100 taken along line VII-VII in FIG. 3 is an exploded perspective view of a first support part 31. FIG. 4 is a perspective view of a second support part 32. FIG. (A) And (b) is sectional drawing of the liquid crystal panel 10 and the optical member 15 in the multi-display system 100 of embodiment of this invention. (A) is sectional drawing which shows the structure of the support pin 60 which concerns on embodiment of this invention. FIG. 6B is a top view showing the contact member 62 of the support pin 60. (A) is sectional drawing which shows the modification of the liquid crystal panel 10 and the sheet-like optical member 15 of embodiment of this invention. FIG. 4B is a bottom view of the optical member 15. It is sectional drawing which shows the modification of the optical member 15 in embodiment of this invention. It is sectional drawing which shows the modification of the optical member 15 in embodiment of this invention. It is sectional drawing which shows the modification of the multi display system 100 in embodiment of this invention. (A) And (b) is a figure for demonstrating the one liquid crystal display device 1100 and the multi-display system 2000, respectively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, components having substantially the same function are denoted by the same reference numerals for the sake of brevity. In addition, this invention is not limited to the following embodiment.

FIG. 1 is a perspective view schematically showing a configuration of a multi-display system 100 according to an embodiment of the present invention. The multi-display system 100 of the present embodiment is an image display device that displays an image using a plurality of liquid crystal panels 10. There is a non-display area between the adjacent liquid crystal panels 10.

FIG. 2 is an enlarged cross-sectional view of the region 50 including the non-display region 55. As shown in FIG. 2, the multi-display system 100 according to the present embodiment includes a plurality of liquid crystal panels 10 and a light source 20 that irradiates light to each of the plurality of liquid crystal panels 10. The light source 20 is accommodated in the backlight chassis 25. A holding member 30 that holds the liquid crystal panel 10 is provided in the non-display area 55 located between the plurality of liquid crystal panels 10.

An optical member (for example, a diffusing plate) 15 is adhered and disposed on the light source 20 side (back surface 10b side) of each liquid crystal panel 10 of the present embodiment. In the configuration of the present embodiment, the holding member 30 holds the liquid crystal panel 10 and the optical member 15 by sandwiching the liquid crystal panel 10 and the optical member 15.

The holding member 30 of the present embodiment is a member that holds the outer edge portion of each liquid crystal panel 10. The holding member 30 includes a first support portion (for example, a metal bezel) 31 that supports the front surface 10 a of the liquid crystal panel 10 and a second support portion that supports the optical member 15 disposed on the back surface 10 b of the liquid crystal panel 10. For example, a plastic chassis) 32 is included. The first support part 31 and the second support part 32 sandwich the liquid crystal panel 10 and the optical member 15. The optical member 15 in close contact with the back surface 10b of the liquid crystal panel 10 is a sheet-like optical member, and in the configuration of the present embodiment, includes at least a layer containing a diffusing material. The diffusion material may be, for example, high refractive index particles dispersed inside the resin material constituting the optical member 15. Alternatively, the diffusion material may be a diffusion layer applied to the surface of the optical material 15 that faces the surface that is in close contact with the liquid crystal panel 10. The optical member 15 may be a combination of a diffusion plate and an optical sheet (for example, a lens sheet or a prism sheet).

In addition, the diffusion plate in the present embodiment is not only the one used in a typical liquid crystal display device (a one in which a diffusion material is dispersed in a resin plate of 1 to several mm), but also a resin film having a thickness of 50 to 500 μm. In which bead-like particles are coated on the surface (typically referred to as a “diffusion sheet”). Furthermore, when the diffusion plate and the optical sheet are combined, the two members are integrated by laminating or bonded with an adhesive substance, so that individual members are rubbed or scratched by dust entering between the members. Can be prevented.

The liquid crystal panel 10 constituting the multi-display system 100 has a size of, for example, 20 inches to 110 inches (typically 32 inches to 60 inches). In the configuration shown in FIG. 1, the multi-display system 100 includes twelve liquid crystal panels 10 that are 4 × 3 in length and width. However, the liquid crystal panel 10 is not limited to this number or arrangement example. For example, two liquid crystal panels 10 may be arranged horizontally (long sides are in the horizontal direction) or two vertically arranged (long sides are in the vertical direction). Alternatively, the liquid crystal panels 10 can be arranged in, for example, 4 × 2 × 2, 9 × 3 × 3, 16 × 4 × 4, and 25 × 5 × 5. Alternatively, the liquid crystal panels 10 may be arranged vertically and arranged in 3 × 1 × 3, 1 × 9 × 9, 2 × 6 × 12, and 2 × 9 × 18.

The liquid crystal panel 10 of this embodiment generally has a rectangular shape as a whole, and is composed of a pair of translucent substrates (glass substrates). The pair of substrates are arranged to face each other, and a liquid crystal layer (not shown) is provided between them. The liquid crystal layer is made of a liquid crystal material whose optical characteristics change with application of an electric field between the two substrates. A sealing agent (not shown) is provided on the outer edge portions of both substrates to seal the liquid crystal layer. In addition, polarizing plates are attached to the outer surfaces of both substrates. In the present embodiment, of the pair of substrates, the back side is an array substrate (TFT substrate), and the front side is a color filter substrate (CF substrate).

The light source (backlight) 20 of the present embodiment is a backlight light source including an LED element. The light source 20 of this embodiment is a direct type LED backlight. As the light source 20, an edge light type LED backlight having a light guide plate can be used. Alternatively, a backlight light source (direct type or edge light type) including a cold cathode tube (CCFL) can be used as the light source 20. In addition, when the light source 20 is a direct type LED backlight, there exists an advantage that a brightness | luminance uniformity can be improved compared with the backlight of a CCFL system.

The multi-display system 100 of this embodiment includes a backlight chassis 25 that houses the light source 20. The backlight chassis 25 of the present embodiment is made of a metal material (for example, aluminum, iron, etc.) and covers the back surface of the single liquid crystal panel 10. A connecting member 22 that connects the adjacent backlight chassis 25 is provided on the back surface of the backlight chassis 25. The connecting member 22 is, for example, a metal plate-like member (reinforcing plate), and is connected to the backlight chassis 25 by fastening members (for example, screws and bolts) (see arrow 24). Secure to each other.

The shielding plate 35 is disposed in the non-display area 55 of the present embodiment. Specifically, the shielding plate 35 is disposed on the upper surface of the first support portion 31 in the holding member 30. The shielding plate 35 is made of, for example, a resin material or a metal material, and is disposed so as to extend along the boundary portion of the liquid crystal panel 10 as shown in FIG. The length of the non-display area 55 (or the width of the shielding plate 35) of the present embodiment is, for example, 10 mm or less, typically 7.1 mm or 6.5 mm, or less (for example, 3 mm or less). The following). That is, the multi-display system 100 of the present embodiment has a system frame width of 10 mm or less (the width dimension of the non-display area 55). In other words, each of the liquid crystal panels 10 has a narrow frame configuration. is doing. In the multi-display system 100 of the present embodiment, since the width dimension of the non-display area 55 is small, the number of joints in the multi-display configuration is reduced, and a large-screen display with more expressive power can be configured. Note that the upper surface of the first support portion 31 may be the surface of the non-display area 55 without arranging the shielding plate 35.

The illustrated holding member 30 has the following structure. Both the first support part 31 and the second support part 32 include a horizontal part extending in parallel with the liquid crystal panel 10 and a vertical part extending perpendicularly to the horizontal part. A shielding plate 35 is placed on the surface of the horizontal portion of the first support portion 31. Further, the horizontal portion of the first support portion 31 and the horizontal portion of the second support portion 32 sandwich the liquid crystal panel 10 and the optical member (for example, a diffusion plate) 15. More specifically, the horizontal portion of the first support portion 31 presses the upper surface of the liquid crystal panel 10 from above, while the horizontal portion of the second support portion 32 presses the lower surface of the optical member 15 from below. 10 and the optical member 15 are held.

Further, the second support portion 32 is placed on a part (26) of the backlight chassis 25. Specifically, a portion on which the holding member 30 is placed is provided on the peripheral portion 26 of the backlight chassis 25, and the second support portion 32 is disposed on the peripheral portion 26 of the backlight chassis 25. Has been. A wiring 40 for driving the liquid crystal panel 10 extends from the liquid crystal panel 10.

Here, a flexible cable (FPC) 40 is attached to the upper side of the array substrate (TFT substrate) constituting the liquid crystal panel 10, and a voltage corresponding to the transmittance of each pixel is applied to the other end of the FPC 40 for screen scanning. A circuit board (for example, a control board) 42 for supplying in synchronization with the timing is arranged. In the illustrated example, the control board 42 is disposed between the first support part 31 and the second support part 32. More specifically, the control board 42 is disposed between the vertical part of the first support part 31 and the vertical part of the second support part 32. The control board 42 is connected to an image control unit (not shown) that converts an image signal and provides a signal corresponding to the transmittance of each pixel to the control board. The image control unit can display an image on each liquid crystal panel 10 and can display an image on the entire multi-display system 100.

FIG. 3A shows a structure that is a comparative example 1000 of the multi-display system of the present embodiment. FIG. 3B shows the structure of the multi-display system 100 of this embodiment. The structure shown in FIG. 3B is the same as the structure shown in FIG. FIGS. 3A and 3B also show the cross-sectional structure around the

non-display areas

155 and 55.

3A, the first support part 131 and the second support part 132 of the holding member 130 hold the liquid crystal panel 110 by sandwiching the liquid crystal panel 110. In the comparative example 1000 shown in FIG. An optical member (for example, a diffusion plate) 115 is held by the second support portion 132 and the peripheral edge portion 126 of the backlight chassis 125. The circuit board (control board) 142 of the cable (FPC) 140 extending from the liquid crystal panel 110 is disposed between the first support part 131 and the second support part 132. A shielding plate 135 is disposed on the upper surface of the first support part 131.

In the structure of the comparative example 1000 illustrated in FIG. 3A, the optical member 115 needs to be placed on the peripheral edge 126 of the backlight chassis 125 in order to support or position the optical member (for example, the diffusion plate) 115. . During the operation of the comparative example 1000, the optical member 115 is thermally expanded / contracted, so that it is necessary to take a relatively large number of portions on which the optical member 115 is placed on the peripheral edge 126. In particular, if the optical member 115 is thermally contracted and is removed from the peripheral portion 126, the optical member 115 stops functioning. Therefore, the portion where the optical member 115 is placed on the peripheral portion 126 is taken with a margin. There is a need.

On the other hand, in the structure of the present embodiment shown in FIG. 3B, the optical member 15 is disposed in close contact with the liquid crystal panel 10, so that the optical member 15 is supported by the liquid crystal panel 10. . More specifically, in the configuration of the present embodiment, since the optical member 15 is fixed to the liquid crystal panel 10, the support or positioning of the optical member 15 is performed using the first support portion 31 and the second support portion 32 (or the peripheral portion). 26). Therefore, compared with the structure of the comparative example 1000 shown in FIG. 3A, the part where the optical member 15 is placed on the peripheral edge portion 26 can be made smaller.

Therefore, the non-display area 55 of the present embodiment shown in FIG. 3B can be made smaller than the non-display area 155 in the comparative example 1000 shown in FIG. That is, with the configuration of the present embodiment, a narrower frame structure can be realized. Further, since the non-display area 55 can be reduced, the display area 52 of the present embodiment shown in FIG. 3B is made larger than the display area 152 of the comparative example 1000 having the same dimensions. Can do.

Furthermore, according to the structure of the present embodiment, since the optical member 15 is fixedly supported by the liquid crystal panel 10, it is relatively easy to make the outer shape of the optical member 15 smaller than the outer shape of the liquid crystal panel 10. It can be carried out. On the other hand, according to the structure of the comparative example 1000, since the optical member 115 needs to be placed on the peripheral edge 126, the outer shape of the optical member 115 is based on the outer shape of the liquid crystal panel 110 as compared with the structure of the present embodiment. There are restrictions on making it smaller.

In the structure of this embodiment, since the optical member 15 is fixed to the liquid crystal panel 10, the liquid crystal panel 10 and the optical member 15 are substantially integrated. Therefore, even if the optical member 15 may be detached from the second support portion 32, as long as the liquid crystal panel 10 is supported by the peripheral edge portion 26, the first support portion 31, the second support portion 32, and the like, Since the optical member 15 is in close contact with the liquid crystal panel 10, it can be avoided that the optical member 15 does not function.

In order to produce the optical member 15 in the liquid crystal panel 10 in the present embodiment, the following can be performed. For example, when a laminated structure in which a diffusion material (diffusion element) is applied to the back surface of the liquid crystal panel 10 is manufactured, the diffusion plate 15 is bonded to the polarizing plate attached to the back surfaces of the pair of transparent substrates with an adhesive (or an adhesive). ). Further, by interposing an adhesive sheet (or a fixing sheet) between the liquid crystal panel 10 and the diffusion plate 15, a laminated structure in which the liquid crystal panel 10 and the diffusion plate 15 are integrated can be manufactured. When the thermal expansion coefficients of the liquid crystal panel 10 and the diffusion plate 15 are different, an intermediate thermal expansion coefficient is set so that the adhesive sheet (or adhesive) can relieve the difference between the thermal expansion coefficients of the two. It is preferable to comprise from the material which has. Note that not only the diffusion plate 15 but also other sheet-like optical members (for example, optical sheets such as lens sheets and prism sheets) are brought into close contact with the liquid crystal panel 10, a substantially similar method can be used. .

Next, the problem of thermal expansion / contraction of the optical member 115 (for example, a diffusion plate) in the comparative example 1000 will be further described with reference to FIGS. 4 (a) to 4 (c).

FIG. 4A is a cross-sectional view substantially similar to the structure 1000 shown in FIG. However, the non-display area 155a shown in FIG. 4A is a non-display area 55 having the same width as the configuration of the present embodiment shown in FIG. 3B, that is, as shown in FIG. The width of the non-display area 155 is narrower. FIG. 4B is a cross-sectional view showing a state where the optical member 115 is thermally contracted. On the other hand, FIG. 4C is a cross-sectional view showing a state where the optical member 115 is thermally expanded.

As shown in FIG. 4A, when the width of the non-display area 155a is narrowed, the frame can be narrowed similarly to the structure shown in FIG. The part on the top becomes narrow.

Then, as shown in FIG. 4B, when the optical member 115 is thermally contracted by the low temperature operation (see the arrow 115a), there is a high possibility that the optical member 115 is detached from the peripheral edge 126 (arrow 116). reference). The multi-display system (100 or 1000) displays an image as a digital advertisement / signboard in a room where the temperature is well controlled, and often displays an image at a temperature similar to that of the outside air (for example, in an airport) Display, outdoor display). Here, it is necessary to make the optical member 115 unusable at a temperature at which the optical member 115 is removed due to heat shrinkage or to increase the width of the non-display area 155a.

On the other hand, as shown in FIG. 4C, when the optical member 115 thermally expands due to the high temperature operation (see arrow 115b), the optical member 115 presses the second support portion (holding member) 132, and the second There is a possibility that the support part 132 is deformed (see arrow 117). If the optical member 115 deforms the second support part 132, a structural problem may occur. At a temperature at which the optical member 115 deforms the second support part 132 due to thermal expansion. It is necessary to make it unusable or to increase the width of the non-display area 155a.

Next, the problem of thermal expansion / contraction of the optical member 15 (for example, a diffusion plate) in the multi-display system 100 of the present embodiment will be described with reference to FIGS.

FIG. 5A is a cross-sectional view similar to the structure 100 shown in FIG. FIG. 5B is a cross-sectional view showing a state where the optical member 15 is thermally contracted. On the other hand, FIG.5 (c) is sectional drawing which shows a mode that the optical member 15 expanded thermally.

As shown in FIG. 5B, the optical member 15 is not supported by the surface of the peripheral edge portion 26 but is supported in close contact with the liquid crystal panel 10. Therefore, when the optical member 15 is thermally contracted by the low temperature operation (see the arrow 15a), it is possible to avoid the optical member 15 being detached from the peripheral edge portion 26 and falling. Further, even if the optical member 15 is detached from the second support portion 32 and the peripheral edge portion 26, the liquid crystal panel 10 is supported on the second support portion 32, so that the optical member 15 is in close contact with the liquid crystal panel 10. Will be supported. Therefore, the restriction due to the thermal contraction of the optical member 15 can be relaxed, and the temperature use range can be substantially expanded.

On the other hand, as shown in FIG. 5C, even when the optical member 15 is thermally expanded due to a high-temperature operation (see arrow 15b), the optical member 15 is prevented from pressing the second support portion (holding member) 32. can do. That is, in the structure of the present embodiment, since the upper surface of the second support portion 32 supports the bottom surface of the optical member 15, even if the optical member 15 expands (arrow 15b), the second support portion 32 is deformed. Can be avoided. More specifically, even if the optical member 15 expands, the optical member 15 deforms the second support portion 32 in order to extend between the horizontal portion of the first support portion 31 and the horizontal portion of the second support portion 32. There is nothing to do. Therefore, restrictions due to thermal expansion of the optical member 15 can be relaxed, and the temperature use range can be substantially expanded.

In the multi-display system 100 of the present embodiment, the holding member 30 is provided in the non-display area 55 located between the plurality of liquid crystal panels 10, and an optical member is provided on the light source 20 side (back surface 10 b side) of each liquid crystal panel 10. 15 is closely arranged. The holding member 30 holds the liquid crystal panel 10 and the optical member 15 by sandwiching the liquid crystal panel 10 and the optical member 15. Since the optical member 15 is disposed in close contact with the liquid crystal panel 10, the optical member 15 can be supported by the liquid crystal panel 10. Therefore, even when the optical member 15 is thermally expanded / contracted, it is possible to prevent the holding member 30 from being deformed and the optical member 15 from being detached. As a result, according to the configuration of the present embodiment, the multi-display system 100 suitable for narrowing the frame can be realized.

In the configuration of the comparative example 1000 shown in FIG. 4A, in order to avoid the influence of the thermal contraction / expansion of the optical member 115, the width of the peripheral edge 126 of the backlight chassis 125 is, for example, 60 inches of liquid crystal. In the panel, it is necessary to provide at least 3.7 mm in the longitudinal direction. On the other hand, according to the configuration of the present embodiment, the width of the peripheral edge portion 26 of the backlight chassis 25 can be made less than 3.7 mm in the longitudinal direction in a 60-inch liquid crystal panel, for example.

Next, the position change of the liquid crystal panel 10 and the optical member 15 that occurs when the internal temperature of the multi-display system 100 is between −20 ° C. (low temperature storage temperature at which the module does not operate) and 80 ° C. (the upper limit temperature at which the module operates). The amount will be described.

The diffusion coefficient (PS (polystyrene)) which is an example of the optical member 15 has a linear expansion coefficient of 6.8 × 10 ⁻⁵ , and the linear expansion coefficient of the glass constituting the liquid crystal panel is 3.3 × 10 ^−5. It is. Moreover, the linear expansion coefficient of the steel material which comprises a backlight chassis is 1.2 * 10 <^-5> . The difference from the backlight chassis (steel material) is 5.6 × 10 ⁻⁵ for the diffusion plate (PS) and 2.1 × 10 ⁻⁵ for the glass.

Under such conditions, in the 60-inch liquid crystal panel 10 unit, the position change (one side) of the diffusion plate (PS) is 3.7 mm, and the glass position change (one side) is 1.3 mm. Become. Therefore, in the case of the comparative example 1000 in which the change in the position of the diffusion plate 115 is affected, a displacement of 3.7 mm is caused on one side when it expands in the center symmetry. Therefore, in the case of the comparative example 1000, it is necessary to provide a non-display area 155 of at least 7.4 mm at the joint of the liquid crystal panel 110 units. On the other hand, in the configuration of this embodiment, the influence of the thermal expansion of the diffusion plate 15 can be avoided and the influence of the thermal expansion of the liquid crystal panel 10 can be taken into account, so the position change on one side is 1.3 mm. Therefore, the non-display area 55 of about 3 mm may be provided at the joint of the liquid crystal panel 10 units. As a result, the multi-display system 100 suitable for narrowing the frame can be realized.

Next, the structure of the multi-display system 100 of this embodiment will be further described with reference to FIGS. FIG. 6 is a top view schematically showing the configuration of the liquid crystal panel 10 and the first support portion (for example, bezel) 31. FIG. 7 is a cross-sectional view taken along line VII in FIG. FIG. 8 is an exploded perspective view of the first support portion 31. FIG. 9 is a perspective view of the second support portion (for example, chassis) 32.

As shown in FIG. 6, a first support portion (bezel) 31 is disposed on the outer edge portion of one liquid crystal panel 10 in the multi-display system 100. As shown in FIG. 7, the liquid crystal panel 10 and the optical member 15 are held by the first support portion 31 and the second support portion (chassis) 32. The 1st support part 31 and the 2nd support part 32 are mutually fixed by the fastening member (screw or screw) 37 shown in FIG.

In the configuration shown in FIG. 7, the liquid crystal panel 10 is connected to

circuit boards

42a and 42b via a cable (for example, FPC) 40. In the illustrated example, the circuit board 42a is a source board, and the circuit board 42b is a control board. Note that a gate substrate can be provided as the circuit substrate. The light source 20 is accommodated in the backlight chassis 25, and the second support portion 32 can be placed on the peripheral edge portion 26 of the backlight chassis 25.

The first support portion (bezel) 31 shown in FIG. 8 is configured by connecting metal members 31a having four independent sides. Each metal member 31a is fixed by passing a fastening member (screw) through the

screw holes

38a, 38b, thereby constructing the first support portion 31. The second support portion 32 shown in FIG. 9 is an integrally molded plastic chassis. The second support portion 32 is formed with an opening portion 32 a for transmitting light from the light source 20. Note that the structures shown in FIGS. 6 to 9 are examples, and the multi-display system 100 of the present embodiment may be constructed by other structures.

Next, a modified example of the multi-display system 100 according to the present embodiment will be described with reference to FIGS. 10A and 10B are cross-sectional views of the liquid crystal panel 10 and the sheet-like optical member 15 in the multi-display system 100 of the present embodiment.

As shown in FIG. 10A, the liquid crystal panel 10 is composed of a pair of

translucent substrates

11 and 12. In this example, the front substrate 11 is a color filter substrate (CF substrate), and the back substrate 12 is an array substrate (TFT substrate). Polarizing plates 13 are attached to the outer surfaces of both the

substrates

11 and 12, respectively. An optical member (for example, a polarizing plate) 15 is closely attached to the polarizing plate 13 located below.

The light source 20 that irradiates the liquid crystal panel 10 is housed in the backlight chassis 25. The light source 20 is, for example, an LED element. The backlight chassis 25 can accommodate a substrate on which LED elements are arranged. In the backlight chassis 25, support pins 60 are provided at predetermined intervals in order to prevent the sheet-like optical member 15 from bending downward. The support pin 60 can secure an appropriate distance between the optical member 15 and the light source 20, and can suppress excessive deflection due to vibration during transportation.

In the case of the structure of the comparative example 1000 shown in FIG. 3A, the liquid crystal panel 110 and the optical member 115 are separated from each other, so that the tip of the support pin 60 is in contact with the optical member 115 and the liquid crystal panel 110 is shocked. Did not give. In addition, since the liquid crystal panel 110 and the optical member 115 are separated from each other, even if an impact at the tip of the support pin 60 is applied to the optical member 115, the impact can be avoided by bending the optical member 115 upward. it can.

On the other hand, in the case of the structure of the present embodiment, as shown in FIG. 10B, when the liquid crystal panel 10 and the optical member 15 are bent downward, the optical member 15 is in close contact with the liquid crystal panel 10, so that support is provided. When the tip of the pin 60 comes into contact with the optical member 15, there is a possibility of giving an impact to the liquid crystal panel 10 together with the optical member 15. In such a case, the optical member 15 may be chipped or holed, and the surface of the liquid crystal panel 10 may be scratched.

Therefore, in the configuration shown in FIG. 10A, it is desirable that the support pin 60 is made of at least the tip from a material having elasticity. Alternatively, it is also preferable to modify the support pin 60 so as to increase the surface area by rounding the tip of the support pin 60 compared to the pointed tip.

Furthermore, as shown in FIGS. 11A and 11B, an impact absorbing member (61, 62) can be provided at the tip of the support pin 60. FIG. 11A is a schematic cross-sectional view of the tip of the support pin 60, and FIG. 11B is a schematic top view of the support pin 60 shown in FIG. 11A.

As shown in FIG. 11 (a), a shock absorbing buffer member 61 is connected to the tip of the support pin 60, and a contact member 62 is provided at the tip of the buffer member 61. As shown in FIG. 11B, the contact member 62 has an annular structure, but other configurations (for example, a disk shape, a polygonal ring shape, etc.) may be adopted. Further, the shock absorbing member 61 is not limited to the one shown in FIG. 11A as long as it can absorb the impact caused by the tip of the support pin 60, but may have another configuration (for example, a spring-like structure). I do not care.

Furthermore, the elasticity of the optical member 15 may be improved. FIG. 12A is a cross-sectional view showing a modified example of the liquid crystal panel 10 and the sheet-like optical member 15 of the present embodiment. FIG. 12B is a cross-sectional view (or an enlarged cross-sectional view) of the optical member 15 shown in FIG.

As shown in FIG. 12B, the illustrated optical member 15 is a sheet-like member containing bubbles 17, and is configured so that the elasticity is improved by the bubbles 17 included in the optical member 15. The optical member 15 in this example is a diffusing plate having scattering properties due to the bubbles 17. For example, the bubble-containing optical member 15 is a member in which bubbles 17 are present inside a sheet-like member mainly composed of polycarbonate.

FIG. 13 is a cross-sectional view showing an example of the optical member 15 in the embodiment of the present invention. The optical member 15 shown in FIG. 13 includes a diffusion layer (for example, an acrylic foam layer, film thickness of 200 μm) 18 having bubbles 17 and a transparent resin film (for example, a transparent polystyrene layer, film thickness of 700 μm) 16a. . On the upper surface of the diffusion layer 18 having the bubbles 17, a layered adhesive substance (for example, acrylic adhesive layer, film thickness 50 μm) 14a is provided, and the diffusion layer is interposed via the adhesive substance (adhesive layer) 14a. The optical member 15 including 18 is bonded to the liquid crystal panel 10.

On the lower surface of the translucent resin material (foam layer) 18, a layered adhesive substance (for example, acrylic adhesive layer, film thickness 50 μm) 14 b is provided. A transparent resin layer (for example, a transparent polystyrene layer) 16a is formed on the translucent resin material (foam layer) 18 via an adhesive substance (adhesive layer) 14b. A plurality of concave or convex structures 16b are formed on the lower surface of the transparent resin layer 16a. In this example, on the surface (lower surface) of the transparent resin layer 16a made of transparent polystyrene, a quadrangular pyramidal protrusion-shaped structure 16b is formed by transfer during production. The structure 16b can improve the diffusibility or scattering of light passing through the optical member 15.

Further, as shown in FIG. 14, an optical member 15 may be configured. The optical member 15 shown in FIG. 14 includes a diffusion layer (for example, a polyester foam layer) 18 having bubbles 17 and a bead layer 19 made of beads 19a. An adhesive layer (for example, an acrylic adhesive material layer) 14 is formed on the upper surface of the diffusion layer (foamed layer) 18 by application. The optical member 15 including the diffusion layer 18 is bonded to the liquid crystal panel 10 via the adhesive layer 14. A bead layer 19 is formed on the lower surface of the diffusion layer (foaming layer) 18 by applying beads 19a. The bead layer 19 can improve the diffusibility or scattering of light passing through the optical member 15.

Further, in the above-described embodiment, the liquid crystal panel 10 and the optical member 15 are sandwiched between the first support portion 31 and the second support portion 32. However, as shown in FIG. You may make it pinch | interpose. More specifically, since the optical member 15 is bonded to the liquid crystal panel 10, the optical member 15 bonded to the liquid crystal panel 10 can be held together with the liquid crystal panel 10 when the liquid crystal panel 10 is sandwiched and fixed.

15, the outer shape of the optical member 15 is formed to be smaller than the outer shape of the liquid crystal panel 10. And the area | region 19 in which the optical member 15 is not arrange | positioned is provided in all four sides in the rectangular shape of the liquid crystal panel 10. FIG. And in the area | region 19 in which the optical member is not arrange | positioned, the holding member 30 (31, 32) pinches | interposes the liquid crystal panel 10, and is holding the liquid crystal panel 10 and the optical member 15 adhere | attached on it. In the example shown in FIG. 15, the first support portion 31 presses the polarizing plate 13 of the liquid crystal panel 10, while the second support portion 32 presses the glass substrate (array substrate) 12 of the liquid crystal panel 10. An optical member 15 is bonded and fixed to the glass substrate 12 via an adhesive layer 14. According to this configuration, since the holding member 30 (31, 32) is configured to selectively sandwich the liquid crystal panel 10 without sandwiching the optical member 15, a thinner multi-display system 100 can be constructed.

As mentioned above, although this invention has been demonstrated by suitable embodiment, such description is not a limitation matter and, of course, various modifications are possible. For example, as a method of configuring an optical film, a polarizing plate is handled as a component of a liquid crystal panel. However, in realizing the configuration of the embodiment of the present invention, the polarizing plate and the optical film are integrated into a liquid crystal. A method of attaching to a panel is also possible. In this configuration, it is possible to make the base film on the incident side thinner or to eliminate the base film as compared with a polarizing plate used as a component in a normal liquid crystal panel.

According to the present invention, a multi-display system with a narrow frame can be provided.

10 Liquid crystal panel 11 CF substrate 12 Array substrate 13 Polarizing plate 14 Adhesive layer 15 Optical member (diffuser plate)
16a Transparent resin layer 16b Projection-shaped structure 17 Air bubble 18 Diffusion layer (foaming layer)
19 Bead layer 20 Light source 22 Connecting member 25 Backlight chassis 26 Peripheral part 30 Holding member (bezel)
31 1st support part 32 2nd support part 35 Shielding plate 40 Cable (FPC)
42 Circuit board (control board)
52 display area 55 non-display area 60 support pin 61 buffer member 62 contact member 100 multi-display system 2000 multi-display system

Claims

A multi-display system for displaying images by a plurality of liquid crystal panels,
Multiple LCD panels,
A light source for irradiating light to each of the plurality of liquid crystal panels;
The light source is housed in a backlight chassis,
A non-display area located between the plurality of liquid crystal panels is provided with a holding member for holding the liquid crystal panel,
An optical member is adhered and arranged on each light source side of each of the plurality of liquid crystal panels.
The multi-display system according to claim 1, wherein the holding member holds the liquid crystal panel and the optical member by sandwiching the liquid crystal panel and the optical member.
The holding member includes a first support portion that supports the surface of the liquid crystal panel, and a second support portion that supports the optical member disposed on the back surface of the liquid crystal panel.
The multi-display system according to claim 2, wherein the first support part and the second support part sandwich the liquid crystal panel and the optical member.
The liquid crystal panel has a rectangular shape,
The optical member is formed smaller than the liquid crystal panel,
On all four sides in the rectangular shape of the liquid crystal panel is provided a region where the optical member is not disposed,
The multi-display system according to claim 1, wherein the holding member holds the liquid crystal panel and the optical member by sandwiching the liquid crystal panel in a region where the optical member is not disposed. .
The holding member includes a first support portion that supports the surface of the liquid crystal panel, and a second support portion that supports the optical member disposed on the back surface of the liquid crystal panel.
5. The multi-display system according to claim 1, wherein the first support part and the second support part sandwich the liquid crystal panel. 6.
The multi-display system according to any one of claims 1 to 5, wherein the second support part is disposed on a peripheral part of the backlight chassis.
The multi-display system according to any one of claims 1 to 6, wherein the liquid crystal panel and the optical member are bonded via a layered adhesive substance.
The multi-display system according to any one of claims 1 to 7, wherein the optical member includes at least a diffusion material.
The diffusion material is dispersed in a resin medium;
The multi-display system according to claim 8, wherein the diffusion material is a particle having a refractive index higher than that of the medium.
The multi-display system according to claim 8, wherein the diffusing material is applied to a surface on a side opposite to a surface in close contact with the panel of the optical material.
The optical member includes a diffusion layer formed by dispersing the diffusion material in a resin medium, and a transparent resin film.
9. The multi-display system according to claim 8, wherein one surface of the diffusion layer is integrated by being bonded or laminated to one surface of the transparent resin film.
The multi-display system according to claim 11, wherein the transparent resin film includes a plurality of concave or convex structures on a surface opposite to a surface in contact with the diffusion layer.
The multi-display system according to any one of claims 1 to 12, wherein the light source is a backlight light source including an LED element.
The multi-display system according to any one of claims 1 to 13, wherein a width of the non-display area is 10 mm or less.
A support pin that supports the optical member is disposed in the backlight chassis,
The multi-display system according to claim 1, wherein a shock absorbing member is provided at a tip of the support pin.
The multi-display system according to any one of claims 1 to 15, wherein the optical member is a sheet-like member containing bubbles.
The multi-display according to claim 7, wherein the optical member is bonded to the liquid crystal panel via the layered adhesive substance, and the layered adhesive substance contains bubbles. system.