JP2012150366A - Light guide member and multi-display device including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light guide member capable of making a non-display area in a multi-display device inconspicuous with a simple configuration and inexpensive manufacturing cost, and a multi-display device including the same.
A light guide member 30 includes a display panel 20 capable of displaying an image, and a multi-display device configured by arranging a plurality of image display devices 10 including a bezel 21 surrounding a display region V1 on the display panel 20 in a plane. 1 has a long shape formed of a translucent material in a long shape capable of covering the bezel 21 between adjacent display areas V1, and each adjacent display area in the covered state The display light emitted from V1 is captured, and the captured light can be emitted to the outside between adjacent display areas V1.
[Selection] Figure 2

Description

  The present invention relates to a light guide member for making a non-display area such as a frame that cannot display an image in a multi-display device inconspicuous, and a multi-display device including the light guide member.

  In recent years, a multi-display device capable of displaying one large image as a whole by arranging a plurality of image display devices including a display panel capable of displaying an image as an information display and a business display adjacent to each other vertically and horizontally. It has come to be used.

  A multi-display device can easily construct a large screen by arranging a plurality of display panels, but a frame called a bezel is arranged at the joint between each image display device. Thus, a region that cannot be displayed (hereinafter referred to as “non-display region”) is formed. Due to this non-display area, a large screen displayed on the multi-display device looks like a grid-like line, and there is a problem that the quality of the displayed image is lowered.

  A conventional technique for solving such a problem is proposed in Patent Document 1, for example. In the prior art described in Patent Document 1, a plurality of projectors that project image light, a plurality of Fresnel lenses that convert image light projected from each projector into parallel light, and image light converted into parallel light And a screen portion formed of a plurality of light guides that guide image light forward, and the image light output end face is biased toward the center side with respect to the image light input end face in each light guide. As described above, there has been proposed a multi-display device in which a unified image display surface without a frame is formed on the front end surface of a screen portion by bending an optical fiber constituting each light guide.

  In the prior art described in Patent Document 1, not only the configuration for realizing the multi-display device is complicated, but in order to realize the multi-display device, a bundle of optical fibers corresponding to the number of pixels is formed. There is a problem that it is necessary and the manufacturing cost becomes high.

JP 2004-177632 A

  An object of the present invention is to provide a light guide member that can make a non-display area in a multi-display device inconspicuous with a simple structure and low manufacturing cost, and a multi-display device including the same.

The present invention relates to a light guide member that can be attached to a multi-display device in which a plurality of image display devices each including a display panel capable of displaying an image and a frame surrounding an image display area on the display panel are arranged in a plane. Because
The light guide member is formed in a long shape with a material having translucency, and has a long portion that covers a frame between adjacent display regions in a multi-display device,
The long part is formed so as to capture display light emitted from each adjacent display region in a covered state and to be able to emit the captured light to the outside between the adjacent display regions. The light guide member.

In the present invention, the long part is
A pair of light incident surfaces extending in parallel with each other along the longitudinal direction and facing each adjacent display region in the covering state;
The pair of light incident surfaces are connected to edges on the side away from each other, and are convexly formed toward one side of the width direction in which the pair of light incident surfaces are separated and the height direction perpendicular to the longitudinal direction. A light exit surface;
In the pair of light incident surfaces, including light reflecting surfaces that are continuous with the edges on the sides close to each other and formed convex toward one side in the height direction,
The light emitting surface is characterized in that irregularities are formed so as to become dense from the outside in the width direction toward the center.

In the present invention, each of the light incident surfaces is formed in a rectangular shape,
The dimension in the short direction of each light incident surface is larger than the thickness in the height direction at the center in the width direction.

Further, the invention is characterized in that the light reflecting surface is provided with a mirror surface.
In the invention, it is preferable that the unevenness has a ridge or a groove extending along the longitudinal direction.

Further, the invention is characterized in that the light emitting surface is formed as a curved surface.
In addition, the present invention controls a display panel capable of displaying an image, a frame that surrounds an image display area on the display panel, a backlight that irradiates light to the display panel, and driving of the backlight A plurality of image display devices that are arranged side by side in a plane,
Covering the frame between adjacent display areas, the light guide member,
The backlight control unit controls driving of the backlight such that the amount of light emitted from a region facing the light incident surface of the light guide member in the display region is increased. A display device.

In addition, the present invention includes a display panel capable of displaying an image, a frame surrounding an image display area on the display panel, and a display control unit that controls driving of the display panel, and is arranged side by side in a plane. A plurality of image display devices,
Covering the frame between adjacent display areas, the light guide member,
The display control unit controls driving of the display panel so that the amount of light emitted from a region facing the light incident surface of the light guide member in the display region is increased. Device.

  According to the present invention, a non-display area in a multi-display device can be made inconspicuous with a simple configuration and an inexpensive manufacturing cost. Thereby, it can prevent that the quality of the image displayed on a multi-display apparatus falls.

It is a perspective view which shows the multi-display apparatus 1 provided with the light guide member 30 which concerns on one Embodiment of this invention. It is a figure which simplifies and shows the cross section seen from the cut surface line II-II of FIG. FIG. 2 is a front view of the multi-display device 1 and shows the multi-display device 1 with the light guide member 30 removed. It is sectional drawing which expands and shows a cross section when the light guide member 30 is cut | disconnected by the virtual plane perpendicular | vertical to the longitudinal direction Y. As shown in FIG. FIG. 5A is a front view showing a display state of the multi-display device 1. FIG. 5A shows a display state of a screen when the light guide member 30 is not attached to the image display device 10, and FIG. FIG. 4 is a diagram illustrating a display state of a screen when a light guide member 30 is attached to the image display device 10. It is sectional drawing which expands and shows the cross section when light guide member 30A which concerns on other embodiment is cut | disconnected by the virtual plane perpendicular | vertical to the longitudinal direction Y. It is sectional drawing which looked at the multi-display apparatus 1 in a present Example from the cut surface line II-II of FIG. It is a block diagram of the liquid crystal display device 10 which comprises the multi-display apparatus 1 in a present Example.

  FIG. 1 is a perspective view showing a multi-display device 1 including a light guide member 30 according to an embodiment of the present invention. FIG. 2 is a simplified view of the cross section viewed from the section line II-II in FIG. FIG. 3 is a front view of the multi-display device 1 and shows the multi-display device 1 with the light guide member 30 removed.

  The multi-display device 1 includes a plurality of image display devices 10 each including a display panel 20 capable of displaying an image according to image information so that the display panels 20 are arranged in a matrix or in a plane along one direction. The display panels 20 are arranged close to each other, and each of the display panels 20 is provided with image information of divided images obtained by dividing one image according to the arrangement of the display panels 20. As a whole, the one image can be displayed.

  As shown in FIG. 1, the multi-display device 1 according to the present embodiment is configured by arranging four image display devices 10 so as to be arranged in a 2 × 2 matrix. In another embodiment, for example, 16 image display devices 10 may be arranged and arranged in a 4 × 4 matrix, and three image display devices 10 are arranged in one direction. They may be arranged and configured as described above.

  Each image display device 10 constituting the multi-display device 1 has a surface on one side in the thickness direction of the display panel 20 configured in a rectangular flat plate shape and a surface on which an image is displayed (hereinafter referred to as “display surface”). The bezel 21 which is a frame is provided so as to cover the peripheral area of the rectangular frame shape in the 20a. The bezel 21 is formed in a rectangular frame shape corresponding to the shape of the peripheral area on the display surface 20 a of the display panel 20. Hereinafter, an area that is not covered by the bezel 21 and is exposed to the outside on the display surface 20a of the display panel 20 is referred to as a “display area”. That is, the divided image is displayed in the display area V1 of each image display device 10.

  Therefore, when the multi-display device 1 is viewed from the front (that is, the side facing the display surface 20a), the surface of the bezel 21 is exposed in a region sandwiched between the display regions V1 arranged in a plane. The image cannot be displayed. Thus, when the multi-display device 1 is viewed from the front, an area where an image cannot be displayed is referred to as a “non-display area”.

  As shown in FIG. 3, not only the display area V <b> 1 (hereinafter referred to as “first non-display area”) V <b> 21 but also all display areas V <b> 1 and the first non-display are included in the non-display area V <b> 2. A rectangular frame region (hereinafter referred to as “second non-display region”) V22 surrounding the region V21 is also included.

  As shown in FIGS. 1 and 2, the multi-display device 1 according to the present embodiment includes a light guide member 30 that covers the non-display area V <b> 2, particularly the bezel 21 arranged in the first non-display area V <b> 21. Is done. The light guide member 30 is formed as a long member extending in one direction, and the extending direction of the bezel 21 disposed between a pair of adjacent display regions V1 and the longitudinal direction of the light guide member 30 are matched. In addition, the edge region V11 (see FIG. 4) of one display region V1 adjacent to the bezel 21 extends from the edge region V11 of the other display region V1 across the bezel 21 arranged between the edge regions V11. It is provided as follows.

Hereinafter, the configuration of the light guide member 30 will be described in detail.
FIG. 4 is an enlarged cross-sectional view of the light guide member 30 taken along a virtual plane perpendicular to the longitudinal direction Y thereof. In FIG. 4, a state in which the light guide member 30 is attached is shown, and a pair of adjacent image display devices 10 are illustrated by virtual lines.

  As shown in FIG. 4, the light guide member 30 is formed so that the shape of a cross section perpendicular to the longitudinal direction Y is substantially an arch shape. Here, in the cross section of the light guide member 30 perpendicular to the longitudinal direction Y, the direction extending from one end of the arch to the other end (that is, the left-right direction in FIG. 4) is defined as the width direction X of the light guide member 30, and the width A direction perpendicular to both the direction X and the longitudinal direction Y (that is, the vertical direction in FIG. 4) is defined as the height direction Z of the light guide member 30. That is, as shown in FIG. 4, the light guide member 30 is attached to a pair of adjacent image display devices 10 so that the width direction X thereof matches the width direction of the bezel 21.

  The light guide member 30 is made of a light-transmitting material, and is made of, for example, polycarbonate resin, acrylic resin, ABS (Acrylonitrile-Butadiene-Styrene) resin, glass, or the like.

  The light guide member 30 has a flat light incident surface 31 for taking display light emitted from each edge region V11 of a pair of adjacent display regions V1 at one end and the other end in the width direction X. Each is formed. The two light incident surfaces 31 are both formed in a rectangular shape, and extend in parallel with each other along the longitudinal direction Y and on a virtual plane that is perpendicular to the height direction Z of the light guide member 30. Is formed.

  In addition, the light guide member 30 is connected to the outer edge 31a of each of the two light incident surfaces 31, and has a light emitting surface 32 that is convex toward one side in the height direction Z, and each of the two light incident surfaces 31. It has a light reflecting surface 33 that is continuous with the inner edge 31b and that is convex toward one side in the height direction Z. Here, the outer edge 31a is an edge (an edge on the side away from each other) arranged outside the light guide member 30 in the width direction X on each light incident surface 31, and the inner edge 31b. In each light incident surface 31, it is an edge (end edge on the side close to each other) arranged on the side of the central portion 35 in the width direction X of the light guide member 30.

  The light emitting surface 32 is a surface formed so that the display light taken into the light guide member 30 is emitted to the outside through each light incident surface 31. In the present embodiment, the light emitting surface 32 is shown in FIG. As shown, a plurality of protrusions 34 that protrude outward and extend along the longitudinal direction Y are integrally formed on the light emitting surface 32. More specifically, the plurality of protrusions 34 are formed on the light emission surface 32 such that the distance between the plurality of protrusions 34 decreases toward the center portion 35 in the width direction X of the light guide member 30. That is, the protrusions 34 are densely provided on the light emitting surface 32 toward the central portion 35 in the width direction X of the light guide member 30. The light guide member 30 having such a plurality of protrusions 34 can be easily manufactured by, for example, extrusion molding.

  The light reflecting surface 33 is configured to reflect light with a high reflectance. For example, a metal thin film such as an aluminum alloy is formed by vapor deposition, and the metal thin film is subjected to various processes such as white mirror finishing, mirror processing, and plating treatment. It is processed into a mirror surface by performing the above process.

  As shown in FIG. 4, in the light guide member 30 of the present embodiment, both the light emitting surface 32 and the light reflecting surface 33 are formed by convex curved surfaces on one side in the height direction Z. More specifically, the light guide member 30 is formed by a curved surface whose inclination angle with respect to an imaginary line extending in the width direction X becomes smaller toward the central portion 35 in the width direction X of the light guide member 30. Accordingly, the central portion 35 in the width direction X of the light guide member 30 corresponds to the top portion of the arch.

  Furthermore, in the light guide member 30 of the present embodiment, the light emitting surface 32 and the light reflecting surface 33 are formed so as to approach each other toward the central portion 35 in the width direction X. Therefore, the light guide member 30 is formed such that the thickness (dimension in the height direction Z) T is the smallest at the central portion 35 in the width direction X, that is, at the top of the arch.

  As shown in FIG. 4, the light guide member 30 formed in this way is arranged so that the width direction X of the light guide member 30 and the width direction of the bezel 21 coincide, that is, the two light incident surfaces 31 are display panels. It attaches to a pair of adjacent image display apparatus 10 so that it may become parallel with respect to 20 display surfaces 20a. Therefore, in the state attached to the image display device 10, the light reflecting surface 33 of the light guide member 30 faces the bezel 21 in the pair of image display devices 10, and the light emitting surface 32 of the light guide member 30 is the display surface. Facing the side facing 20a.

  Attachment of the light guide member 30 to the image display device 10 may be realized by bonding and fixing to the bezel 21 using an adhesive such as a double-sided adhesive tape, for example. However, it is not limited to the attachment method by such adhesion | attachment, The attachment method based on a well-known technique may be used.

  The dimension of the light guide member 30 is appropriately determined according to the configuration of the image display device 10 to be attached. For example, the distance W2 between the two light incident surfaces 31 in the width direction X is a pair of adjacent image display devices. It is determined according to the width of each of the ten bezels 21.

  In addition, the dimension W1 in the width direction X of each light incident surface 31 is the area of the light incident surface 31 from the viewpoint of increasing the amount of display light guided to the first non-display region V21 through the light incident surface 31. In order to increase, it is preferable to take as large as possible. However, since the dimension W1 in the width direction X of the light incident surface 31 corresponds to the width of the edge region V11 in the display region V1 of the image display device 10, the dimension W1 in the width direction X of the light incident surface 31 increases. The light guide member 30 increases the area where the image is unclear. Therefore, the dimension W1 in the width direction X of each light incident surface 31 is preferably determined in consideration of the size of the display area V1 of the image display device 10 to be attached, the screen resolution, the pixel size, and the like. You may determine so that it may become equal to the dimension corresponded to 5 pixels.

  In the present embodiment, as shown in FIG. 4, the light incident surface 31 and the display panel 20 are in contact with each other when attached to the image display device 10. It may be formed so that a gap is provided between the display panel 20 and the display panel 20.

  In forming the light guide member 30, as shown in FIG. 4, the dimension W1 in the width direction X of each light incident surface 31 is greater than the thickness T of the central portion 35 in the width direction X of the light guide member 30. It is preferable to form so as to be large. With such a configuration, the amount of display light guided to the first non-display area V21 is increased, and the amount of protrusion of the light guide member 30 from the display surface 20a when the light guide member 30 is attached to the image display device 10 is increased. Can be reduced.

  Here, as an example of specific dimensions of the light guide member 30, the multi-display device 1 has an image display device in which the screen resolution is 1920 × 1080 pixels, the screen size is 60 inches, and the width of the bezel 21 is 3 mm. 10 are arranged side by side, each light incident surface 31 of the light guide member 30 has a width direction X dimension W1 of about 5 mm, and the light guide member 30 has a central portion 35 in the width direction X of The thickness T is formed to about 1 mm.

  FIG. 5 is a front view showing a display state of the multi-display device 1, and FIG. 5A shows a display state of the screen when the light guide member 30 is not attached to the image display device 10. (B) is a figure which shows the display state of a screen when the light guide member 30 is attached to the image display apparatus 10. FIG.

  As shown in FIG. 4, the light guide member 30 as described above is attached to a pair of adjacent image display devices 10 so as to straddle the bezel 21 arranged in the first non-display area V <b> 21. The display light emitted from the edge region V11 of V1 is incident on the inside of the light guide member 30 via each light incident surface 31 facing the edge region V11, and the display light incident on the inside of the light guide member 30 is incident on the display light. The light is reflected from the light emitting surface 32 of the light guide member 30 and reflected from the light reflecting surface 33 so as to be guided toward the central portion 35 in the width direction X of the light guide member 30. The light can be emitted outward.

  Therefore, according to the present embodiment, light can be emitted from the first non-display area V21 using a part of the display light emitted from the display area V1. More specifically, the light where the image is interrupted between the adjacent image display devices 10 can be guided to emit light from the first non-display area V21. As a result, in the multi-display device to which the light guide member 30 according to the present embodiment is not attached, although the grid-like line 21L is visually recognized at the part where the divided image is interrupted, as illustrated in FIG. On the other hand, by attaching the light guide member 30, the first non-display area V21 is complemented by the display color of the portion where the image is interrupted, and as shown in FIG. it can. Therefore, it is possible to prevent the quality of the image displayed on the entire multi-display device 1 from being deteriorated.

  In addition, according to the present embodiment, since the plurality of protrusions 34 are formed on the light emitting surface 32 so as to become denser toward the central portion 35, the display light that has entered the light guide member 30. Can be uniformly emitted from one end portion in the width direction X to the other end portion. Thereby, the grid-like line 21L can be reliably made inconspicuous.

  In addition, according to the present embodiment, it is only necessary to attach the light guide member 30 configured as described above to a pair of adjacent image display devices 10, with a simple configuration and an inexpensive manufacturing cost, as described above. The effect can be achieved.

  In the light guide member 30 according to the above-described embodiment, the light emission surface 32 is formed by a curved surface. However, the light emission surface 32 is not limited to this, and is convex toward one side in the height direction Z by connecting the planes. You may form so that it may become. Even in such a case, the same effect can be achieved.

  Moreover, in said embodiment, although the light guide member 30 is attached so that only the bezel 21 arrange | positioned in the 1st non-display area V21 among the non-display areas V2 may be covered, not only the 1st non-display area V21, Furthermore, you may attach the light guide member 30 so that the bezel 21 arrange | positioned in the 2nd non-display area | region V22 may be covered.

  In another embodiment, the light guide member 30 is made of a light-transmitting synthetic resin particle, a hollow particle made of glass and acrylic resin, or a bubble in a light-transmitting material. You may comprise by mixing a light-diffusion material. Thereby, the display light incident through the light incident surface 31 can be diffused inside the light guide member 30.

  FIG. 6 is an enlarged cross-sectional view of a light guide member 30A according to another embodiment cut along a virtual plane perpendicular to the longitudinal direction Y thereof. Since the light guide member 30A according to the present embodiment is configured substantially the same as the light guide member 30 according to the above-described embodiment, the corresponding portions are denoted by the same reference numerals, and redundant description is omitted. To do.

  In the light emitting surface 32 of the light guide member 30A according to the present embodiment, a plurality of concave grooves 36 extending along the longitudinal direction Y are introduced instead of the protrusions 34 in the light guide member 30 according to the above-described embodiment. It forms so that a mutual space | interval may become narrow as it goes to the center part 35 of the width direction X of 30 A of optical members. Thus, even when the concave groove 36 is formed on the light emitting surface 32, the same effect as that of the above-described embodiment can be achieved.

  Further, the light emitting surface 32 of the light guide member according to still another embodiment is formed so as to be interspersed with protrusions or recesses instead of the protrusions 34 and the recess grooves 36 extending along the longitudinal direction Y. Also good. In this case, the protrusions or the recesses are formed on the light emitting surface 32 so as to be denser toward the central portion 35 in the width direction X of the light guide member. Thus, even when the protrusions or the recesses are formed, the same effect as that of the above-described embodiment can be achieved.

  Hereinafter, the case where the image display device 10 constituting the multi-display device 1 is a liquid crystal display device will be described as an example.

  FIG. 7 is a cross-sectional view of the multi-display device 1 according to the present embodiment as seen from the section line II-II in FIG. The multi-display device 1 includes a plurality of liquid crystal display devices 10 arranged side by side and the light guide member 30 described above.

  The liquid crystal display device 10 includes a liquid crystal panel 20 that is a non-light emitting display panel, a bezel 21 that covers a rectangular frame-shaped peripheral region on the display surface 20 a of the liquid crystal panel 20, and a backlight provided on the back side of the liquid crystal panel 20. The unit 22 includes a plurality of optical members 23 provided between the liquid crystal panel 20 and the backlight unit 22, and a frame 24.

  The liquid crystal panel 20 encloses a pair of translucent glass substrates formed in a horizontally long rectangular shape, and liquid crystal molecules that are substances whose optical characteristics change with application of an electric field between the pair of substrates. And a pair of substrates are bonded together with a sealant in a state where a gap corresponding to the thickness of the liquid crystal layer is maintained. When the screen size of the liquid crystal display device 10 is 60 inches, the rectangular liquid crystal panel 20 has a short side dimension of about 760 mm and a long side dimension of about 1340 mm.

  Of the pair of substrates, one substrate is a CF (Color Filter) substrate, and the other substrate is a TFT (Thin Film Transistor) substrate. The TFT substrate is provided with a large number of TFTs and pixel electrodes, which are switching elements, arranged side by side on the inner surface facing the liquid crystal layer, and around these TFTs and pixel electrodes, gate wirings and source wirings forming a lattice shape are provided. It is arranged so as to surround it. The pixel electrode is made of a transparent electrode such as ITO (Indium Tin Oxide) or ZnO (Zinc Oxide).

  On the other hand, on the inner surface side facing the liquid crystal layer, a large number of color filters are arranged side by side on the CF substrate at positions corresponding to the respective pixels. The color filter is arranged so that subpixels of three colors of R (red), G (green), and B (blue) are alternately arranged. A light shielding layer (black matrix) for preventing color mixture is formed between the color filters. A counter electrode facing the pixel electrode on the TFT substrate side is provided on the surface of the color filter and the light shielding layer. In addition, an alignment film for aligning liquid crystal molecules contained in the liquid crystal layer is formed on the inner surface side of each substrate, and a polarizing plate is pasted on the outer surface side opposite to the inner surface side of each substrate. It is attached.

  The backlight unit 22 includes a backlight chassis 22a formed in a substantially box shape opened on one side, a light source 22b accommodated in the backlight chassis 22a, and a reflection sheet (not shown) laid in the backlight chassis 22a. Prepare.

  The backlight chassis 22a is made of metal and is formed in a substantially box shape opened to one side by a bottom plate formed in a horizontally long rectangular shape similar to the liquid crystal panel 20 and a side plate rising from the peripheral edge of the bottom plate. Yes.

  The light source 22b is installed on the inner surface of the bottom plate in the backlight chassis 22a and emits light to illuminate the liquid crystal panel 20. In the present embodiment, the light source 22b is configured by arranging a plurality of LED (Light Emitting Diode) lamps in a matrix on the inner surface of the bottom plate, and further, by controlling each LED lamp individually, for each area. It is configured so that the amount of light can be controlled.

  The reflection sheet is made of a synthetic resin exhibiting white having excellent light reflectivity, and is laid so as to cover the inner surface of the bottom plate and the inner surface of the frame 24 attached to the side plate in the backlight chassis 22a. By this reflection sheet, most of the light emitted from the light source 22b can be guided to the opening side of the backlight chassis 22a.

  The optical member 23 includes an optical sheet 40 and a diffusion plate 41. In the present embodiment, the optical sheet 40 includes two optical sheets 40a and 40b. The optical sheet 40 is composed of a functional resin sheet to which various functions for improving display image quality are given. For example, it has a function of directing the traveling direction of light reaching from the back side through the diffusion plate 41 to the front side.

  The diffusion plate 41 prevents the luminance from being locally biased by diffusing the light emitted from the light source 22b in the surface direction. In the diffusing plate 41, in order to prevent the luminance from being biased in the surface direction, the traveling direction of light includes many components in the surface direction as vector components. On the other hand, the optical sheet 40 converts the traveling direction of light including a lot of vector components in the plane direction into the traveling direction of light including many components in the thickness direction. Specifically, the optical sheet 40 is formed with a large number of lens or prism-shaped portions arranged side by side in the surface direction, thereby reducing the degree of diffusion of light traveling in the thickness direction.

  The frame 24 is made of resin, is generally cylindrical, and is formed in a shape that covers the inner surface of the side plate in the backlight chassis 22a. The frame 24 is attached to the side plate and fixed to the side plate by a fastener such as a screw.

  As described above, the light guide member 30 is arranged so that the extending direction of the bezel 21 disposed between the pair of adjacent display regions V1 and the longitudinal direction of the light guide member 30 coincide with each other and the bezel 21 It is provided so as to straddle the bezel 21 disposed between the edge regions V11 from the edge region V11 of the adjacent display region V1 to the edge region V11 of the other display region V1.

  FIG. 8 is a block diagram of the liquid crystal display device 10 constituting the multi-display device 1 in the present embodiment. The RGB digital signal obtained by decoding the video signal of the divided image is sent to the video signal processing circuit 51 in the video circuit board 50. The video signal processing circuit 51 converts this signal into a signal suitable for display on the liquid crystal panel 20 and transmits it to the area active control circuit 61 in the control circuit board 60.

  A memory 62 for storing various parameters is provided in the control circuit board 60. The area active control circuit 61 analyzes the input RGB digital signal and generates a plurality of PWM signals and RGB corrected video signals while referring to the memory 62. The PWM signal is transmitted to the LED board 70 and input to the enable terminal of each LED drive circuit 71. By this enable terminal, the operation / stop of the LED drive circuit 71 as a switching converter is switched. Therefore, by changing the duty of the PWM signal from 0% to 100%, the LED lamp 90 can be arbitrarily dimmed from fully turned off to fully turned on.

  The RGB corrected video signal is transmitted to the liquid crystal controller 80, and then transmitted to a source driver and a gate driver (not shown) on the liquid crystal panel 20 at an appropriate timing, and displayed on the liquid crystal panel 20 as an image.

  In each liquid crystal display device 10 of the multi-display device 1 in the present embodiment, the area active control circuit 61 is the LED drive circuit 71 of each LED lamp 90 arranged corresponding to the edge region V11 covered by the light guide member 30. On the other hand, a PWM signal with increased duty is transmitted. In this case, the area active control circuit 61 and the LED drive circuit 71 correspond to a backlight control unit.

  Thereby, the light quantity of the display light radiate | emitted from the edge area | region V11 covered with the light guide member 30 increases, and the light quantity of the display light guide | induced to the 1st non-display area | region V21 can be increased. Therefore, the grid-like line 21L as shown in FIG. 5A can be reliably made inconspicuous.

  In the present embodiment, as described above, the area active control circuit 61 is configured to increase the luminance of each LED lamp 90 arranged corresponding to the edge region V11. However, in the other embodiments, The area active control circuit 61 may be configured to generate an RGB corrected video signal in which the pixel value is corrected so as to increase the contrast of the image displayed in the edge region V11. In this case, the area active control circuit 61 and the liquid crystal controller 80 correspond to a display control unit.

  Even in such a case, the amount of display light emitted from the edge region V11 covered by the light guide member 30 can be increased, and the amount of display light guided to the first non-display region V21 can be increased. . Therefore, the grid-like line 21L as shown in FIG. 5A can be reliably made inconspicuous.

  In the above embodiment, the liquid crystal display device 10 is used as the image display device constituting the multi-display device 1. However, the image display device includes a display panel capable of displaying an image, and the image display on the display panel is performed. As long as the bezel is provided so as to surround the region, not only the liquid crystal display device 10, for example, a plasma display device including a plasma display panel that is a self-luminous display panel, Alternatively, an organic EL display device including an organic EL (Electroluminescence) panel which is a self-luminous display panel may be used.

  In the above embodiment, the multi-display device 1 including the light guide member 30 has been described. However, the light guide member 30 as described above may be attached to a bezel of a single image display device.

DESCRIPTION OF SYMBOLS 1 Multi-display apparatus 10 Image display apparatus 20 Display panel 20a Display surface 21 Bezel 30 Light guide member 31 Light incident surface 32 Light output surface 33 Light reflection surface 34 Projection 35 Central part 36 Groove V1 Display area V11 Edge area V2 Non-display Area V21 First non-display area V22 Second non-display area

Claims (8)

A light guide member that can be attached to a multi-display device configured by arranging a plurality of image display devices in a plane in a plane, the display panel being capable of displaying an image, and a frame surrounding an image display area on the display panel,
The light guide member is formed in a long shape with a material having translucency, and has a long portion that covers a frame between adjacent display regions in a multi-display device,
The long part is formed so as to capture display light emitted from each adjacent display region in a covered state and to be able to emit the captured light to the outside between the adjacent display regions. A light guide member. The long part is
A pair of light incident surfaces extending in parallel with each other along the longitudinal direction and facing each adjacent display region in the covering state;
The pair of light incident surfaces are connected to edges on the side away from each other, and are convexly formed toward one side of the width direction in which the pair of light incident surfaces are separated and the height direction perpendicular to the longitudinal direction. A light exit surface;
In the pair of light incident surfaces, including light reflecting surfaces that are continuous with the edges on the sides close to each other and formed convex toward one side in the height direction,
2. The light guide member according to claim 1, wherein unevenness is formed on the light emitting surface so as to become denser from an outer side in the width direction toward a central part. Each of the light incident surfaces is formed in a rectangular shape,
3. The light guide member according to claim 2, wherein a dimension in a lateral direction of each light incident surface is larger than a thickness in the height direction at a central portion in a width direction.   The light guide member according to claim 2, wherein a mirror surface is provided on the light reflecting surface.   The light guide member according to any one of claims 2 to 4, wherein the unevenness includes a protrusion or a groove extending along the longitudinal direction.   The light guide member according to claim 2, wherein the light emitting surface is formed as a curved surface. A display panel capable of displaying an image, a frame that surrounds an image display area on the display panel, a backlight that irradiates light to the display panel, and a backlight control unit that controls driving of the backlight A plurality of image display devices arranged side by side in a plane,
The light guide member according to any one of claims 2 to 6, which covers a frame between adjacent display regions,
The backlight control unit controls driving of the backlight such that the amount of light emitted from a region facing the light incident surface of the light guide member in the display region is increased. Display device. A plurality of image displays arranged side by side in a plane, comprising a display panel capable of displaying an image, a frame surrounding an image display area on the display panel, and a display control unit for controlling driving of the display panel Equipment,
The light guide member according to any one of claims 2 to 6, which covers a frame between adjacent display regions,
The display control unit controls driving of the display panel so that the amount of light emitted from a region facing the light incident surface of the light guide member in the display region is increased. apparatus.

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