WO2020261750A1 - Display apparatus - Google Patents

Display apparatus Download PDF

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Publication number
WO2020261750A1
WO2020261750A1 PCT/JP2020/017995 JP2020017995W WO2020261750A1 WO 2020261750 A1 WO2020261750 A1 WO 2020261750A1 JP 2020017995 W JP2020017995 W JP 2020017995W WO 2020261750 A1 WO2020261750 A1 WO 2020261750A1
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WO
WIPO (PCT)
Prior art keywords
support
diffusion sheet
display device
curved
liquid crystal
Prior art date
Application number
PCT/JP2020/017995
Other languages
French (fr)
Japanese (ja)
Inventor
雅明 宅間
久徳 川上
Original Assignee
株式会社ジャパンディスプレイ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ジャパンディスプレイ filed Critical 株式会社ジャパンディスプレイ
Publication of WO2020261750A1 publication Critical patent/WO2020261750A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods

Definitions

  • An embodiment of the present invention relates to a display device.
  • the liquid crystal display panel is formed to be curved
  • the light guide body of the backlight device is also curved along the back surface of the liquid crystal display panel. It is not easy to bend not only the liquid crystal panel but also the backlight device and maintain the state, and there is a risk that the manufacturing cost will increase.
  • the problem of the embodiment described here is to provide a curved display device capable of reducing the manufacturing cost.
  • the display device includes a backlight device having a support, a light guide plate having a flat emission surface and being supported by the support, and a light source that allows light to enter the light guide plate, and the support.
  • a diffusion sheet that is supported in a curved state on the body and faces the exit surface of the light guide plate, and a liquid crystal display panel that is arranged facing the diffusion sheet and supported in a curved state on the support.
  • FIG. 1 is a perspective view showing the appearance of the display device according to the first embodiment.
  • FIG. 2 is a perspective view showing the display device broken in the longitudinal direction.
  • FIG. 3 is a perspective view showing the display device broken in a direction orthogonal to the longitudinal direction.
  • FIG. 4 is a perspective view showing a display unit of the display device.
  • FIG. 5 is an exploded perspective view of the display device constituting the display unit.
  • FIG. 6 is a perspective view showing a support frame and a backlight device of the display device.
  • FIG. 7 is an exploded perspective view showing a support frame diffusion sheet and a liquid crystal display panel of the display device.
  • FIG. 8 is a perspective view of the display device.
  • FIG. 9 is a cross-sectional view schematically showing an example of a liquid crystal display panel of the display device.
  • FIG. 10 is a vertical sectional view of the display device along the line AA of FIG.
  • FIG. 11 is a cross-sectional view of the display device along the line BB of FIG.
  • FIG. 12 is a cross-sectional view of the display device showing a part of FIG. 11 in an enlarged manner.
  • FIG. 13 is an enlarged cross-sectional view showing a part of the display device according to the first modification.
  • FIG. 14 is a perspective view showing a display device according to the second embodiment.
  • FIG. 15 is an exploded perspective view of a display device constituting the display device according to the second embodiment.
  • FIG. 16 is a perspective view showing the display device according to the second embodiment.
  • FIG. 17 is a cross-sectional view of the display device along the line DD of FIG.
  • FIG. 18 is a vertical sectional view of the display device along the line CC of FIG.
  • FIG. 1 is a perspective view showing the appearance of the display device according to the first embodiment.
  • the display device 10 has a display unit 14 formed in a cylindrical shape, and is configured as a display device capable of displaying an image in all directions.
  • the display device 10 has a substantially cylindrical housing 12 and a substantially cylindrical display unit supported by one end of the housing 12 in the axial direction and erected substantially coaxially with the housing 12.
  • a 14 and a cylindrical protective cover 16 having light transmission are provided.
  • One end of the protective cover 16 in the axial direction is fixed to the housing 12, and the protective cover 16 is erected on the housing 12 coaxially with the display unit 14.
  • the protective cover 16 is arranged with a gap on the outer periphery of the display unit 14 and covers the entire display surface 12a of the display unit 14.
  • a disk-shaped top cover 18 is fixed to the extending end of the display unit 14 and the extending end of the protective cover 16.
  • the top cover 18 has an annular outer peripheral portion 18A that covers the space between the protective cover 16 and the display portion 14, and a disk shape that is formed of synthetic resin or the like and covers the extending end of the display portion 14. It has a central portion 18B of the.
  • FIG. 2 is a perspective view showing the display device 10 broken in the longitudinal direction
  • FIG. 3 is a perspective view showing the display device 10 broken in the direction orthogonal to the longitudinal direction
  • FIG. 4 is a perspective view showing the display unit 14. It is a figure.
  • the display unit 14 has a plurality of, for example, four display devices 40. By arranging the four display devices 40 side by side, a display unit 14 having a cylindrical display surface 20a is formed.
  • Each display device 40 includes a support frame 42, a flat backlight device 50 mounted on the support frame 42, a sheet-shaped liquid crystal display panel 60 attached to the support frame 42 and facing the backlight device 50, and the like. It has.
  • the liquid crystal display panel 60 is curved in a convex shape with respect to the backlight device 50.
  • the four display devices 40 are arranged in a cylindrical shape with the side edges abutting each other, and the four curved liquid crystal display panels 60 form a continuous cylindrical display surface 20a.
  • the ring-shaped first holding frame 22 divided into two is fitted to the lower flange portion 44 of the four support frames 42. Further, the ring-shaped second holding frame 24 is screwed and fixed to the upper flange portion 46 of the four support frames 422.
  • the four display devices 40 are held in a state of being arranged side by side in a cylindrical shape by the first and second holding frames 22 and 24.
  • the display unit 14 configured as described above is attached to the housing 12 with the lower flange portion 44 fitted to the upper opening of the housing 12.
  • the lower flange portion 44 is connected to the bottom wall of the housing 12 via a support bracket 47.
  • a control circuit board, a battery, a speaker, and the like on which electronic components such as drive elements (not shown) are mounted are housed in the housing 12.
  • the wiring (FPC) 48 derived from the liquid crystal display panel 60 and the backlight device 50 of each display device 40 extends into the housing 12 through the inside of the display unit 14 and is electrically connected to the control circuit board. Will be done.
  • FIG. 5 is an exploded perspective view of the display device.
  • the longitudinal direction of the display device 40 is defined as the X direction
  • the width direction orthogonal to the longitudinal direction is defined as the Y direction.
  • the display device 40 includes a support frame 42 as a support, a backlight device 50 attached to the support frame 42, and a curved diffusion sheet 56 arranged to face the backlight device 50.
  • the liquid crystal display panel 60 which is arranged on the diffusion sheet 56 and curved along the diffusion sheet, is provided.
  • the support frame 42 is, for example, made of a metal material such as aluminum.
  • the support frame 42 is the same as the flat rectangular plate-shaped base portion 43, the lower flange portion 44 protruding from one short side portion of the base portion 43, and the lower flange portion 44 from the other short side portion of the base portion 43. It integrally has an upper flange portion 46 projecting in the direction.
  • the base portion 43 has a flat rectangular installation surface 43a for installing the backlight device 50.
  • the base portion 43 and the installation surface 43a are not limited to the rectangular plate shape, but may be formed into a hollow rectangular frame shape.
  • the lower flange portion 44 is provided substantially perpendicular to the installation surface 43a.
  • the lower flange portion 44 is provided on both sides of an arc-shaped tip surface 44a that is curved convexly with respect to the installation surface 43a, an engagement hole 44b provided at substantially the center, and the tip surface 44a. It has a pair of open slits 44c and a first support surface 44d curved in an arc shape located between the installation surface 43a and the engagement hole 44b.
  • the first support surface 44d extends from one end to the other end on the short side side of the base portion 43, and is formed in a band shape having a constant width.
  • the first support surface 44d is curved in a convex shape with respect to the installation surface 43a.
  • the claw 22a of the first holding frame 22 described above can be engaged with the engagement hole 44b and the slit 44c.
  • the upper flange portion 46 is provided substantially perpendicular to the installation surface 43a.
  • the upper flange portion 46 faces the lower flange portion 44 substantially in parallel with the base portion 43 sandwiched between them.
  • the upper flange portion 46 has a second support surface 46a extending from one end to the other end on the other short side of the base portion 43.
  • the second support surface 46a is formed in a band shape having a constant width.
  • the second support surface 46a is curved in a convex shape with respect to the installation surface 43a.
  • the second support surface 46a is formed to have the same radius of curvature as the first support surface 44d.
  • the backlight device 50 includes a rectangular flat plate-shaped light guide plate LG having a flat first main surface (emission surface) SA1 and a light source provided so as to face one side surface (incident surface) of the light guide plate LG, for example, a plurality of light sources.
  • the light emitting element (LED) 51 of the light guide plate LG, the optical sheet (prism sheet OS1 and the diffusion sheet OS2) arranged so as to overlap the exit surface SA1 of the light guide plate LG, and the second main surface (back surface) of the light guide plate LG are opposed to each other. It has a reflective sheet (not shown) provided and a frame (not shown) that supports them.
  • the LED 51 is mounted on the circuit board 52, and the circuit board 52 is fixed to the light guide plate LG and the frame.
  • FIG. 6 is a perspective view showing a support frame and a backlight device.
  • the backlight device 50 is mounted on the installation surface 43a with the second main surface of the light guide plate LG facing the installation surface 43a.
  • the backlight device 50 is attached to the installation surface 43a with double-sided tape or an adhesive, and the light guide plate LG and the optical sheets 0S1 and S2 are arranged so as to face parallel to the installation surface 43a.
  • FIG. 7 is an exploded perspective view showing a support frame, a diffusion sheet attached to the support frame, and a liquid crystal display panel.
  • the diffusion sheet 56 is formed in a substantially rectangular shape, is attached to the support frame 42 in a curved state, and faces the exit surface SA1 of the light guide plate LG and the optical sheets OS1 and OS2. ..
  • the diffusion sheet 56 uses a milky white silicone rubber sheet.
  • the pair of upper and lower first side edge portions 55a and 55b of the diffusion sheet 56 facing in the X direction abut on the first support surface 44d and the second support surface 46a of the support frame 42, and the first support surface 44d and the second support surface 44d and the second support surface 46a.
  • the entire diffusion sheet 56 is curved convexly with respect to the installation surface 43a of the support frame 42, and faces the backlight device 50 with a gap.
  • the pair of left and right second side edge portions 56a and 56b of the diffusion sheet 56 facing in the Y direction extend beyond both side edges of the base portion 43 and are folded back to the back surface side of the base portion 43.
  • the pair of second side edge portions 56a and 56b cover the pair of opposite side edge portions of the backlight device 50.
  • the diffusion sheet 56 is attached to the support frame 42 in a curved state by, for example, attaching a pair of second side edge portions 56a and 56b to the back surface of the base portion 43.
  • FIG. 9 is a cross-sectional view schematically showing an example of a liquid crystal display panel.
  • the liquid crystal display panel 60 is formed between the rectangular first substrate SUB1 and the rectangular second substrate SUB2 arranged to face the first substrate SUB1 and between the first substrate SUB1 and the second substrate SUB2.
  • the liquid crystal layer LQ enclosed in is provided.
  • the first substrate SUB1 and the second substrate SUB2 are each composed of a flexible and light-transmitting insulating substrate made of a synthetic resin, for example, polyimide or the like.
  • the peripheral edge of the second substrate SUB2 is attached to the first substrate SUB1 by the sealing material SE.
  • the polarizing plate PL2 is attached to the surface of the second substrate SUB2 to form the display surface 20a of the liquid crystal display panel 60.
  • the polarizing plate PL1 is attached to the surface of the first substrate SUB1 (the back surface of the liquid crystal display panel 60).
  • the second substrate SUB2 is formed to have substantially the same length as the first substrate SUB1 and a width shorter than the width of the first substrate SUB1.
  • the pair of side edge portions 64a and 64b facing the width direction (Y direction) of the first substrate SUB1 project outward beyond the side edges of the second substrate SUB2, respectively.
  • the pair of side edge portions 64a and 64b are each blackened with a black matrix layer or the like.
  • the pair of short sides of the second substrate SUB2 are substantially flush with the pair of short sides of the first substrate SUB1.
  • the liquid crystal layer LQ is enclosed in a region surrounded by the sealing material SE in the cell gap between the first substrate SUB1 and the second substrate SUB2.
  • DA is provided.
  • a plurality of pixel electrode PEs, a plurality of wirings (signal lines, gate lines), a plurality of switching elements, and the like are provided on the inner surface of the first substrate SUB1.
  • Some wiring WLs are led out to one end in the Y direction of the first substrate SUB1 through the sealing material SE.
  • the FPC 48 described above is connected to these wiring WLs.
  • a common electrode CE In the display area DA, a common electrode CE, a color filter (not shown), and the like are provided on the inner surface of the second substrate SUB2.
  • the common electrode CE faces a plurality of pixel electrodes PE with the liquid crystal layer LQ interposed therebetween.
  • a transparent electrode formed of a transparent conductive material such as ITO (indium tin oxide) is used as the common electrode CE and the pixel electrode PE.
  • the liquid crystal display panel 60 has a transmission display function of displaying an image by selectively transmitting light from the backlight device 50 to the display area DA. Further, the liquid crystal display panel 60 constitutes a so-called sheet display which is flexible, that is, can be bent.
  • the liquid crystal display panel 60 has a pair of first panel side edge portions 61a and 61b facing in the X direction and a pair of second panel side edge portions 64a and 64b facing in the Y direction, which will be described later.
  • the second panel side edge portions 64a and 64b are formed so as to be bendable on the back surface side of the panel along the boundary of the display area DA.
  • FIG. 8 is a perspective view showing a display device to which a liquid crystal display panel is attached
  • FIG. 10 is a vertical sectional view of the display device along the line AA of FIG. 8
  • FIG. 11 is a line BB of FIG.
  • a cross-sectional view of the display device along the line, FIG. 12, is a cross-sectional view of the display device showing a part (panel side edge) of FIG. 11 in an enlarged manner.
  • the liquid crystal display panel 60 is arranged so as to be overlapped with the diffusion sheet 56, and is curved in a convex shape along the diffusion sheet 56.
  • the liquid crystal display panel 60 is arranged with the second substrate SUB2 facing the surface of the diffusion sheet 56.
  • the pair of upper and lower first panel side edges 61a and 61b of the liquid crystal display panel 60 facing in the X direction come into contact with the first support surface 44d and the second support surface 46a of the support frame 42 via the diffusion sheet 56, and the first one. It is curved along the 1 support surface 44d and the 2nd support surface 46a. As a result, the entire liquid crystal display panel 60 is supported in a state of being convexly curved with respect to the installation surface 43a of the support frame 42, and the display area DA and the display surface 12a of the liquid crystal display panel 60 cover the entire surface of the diffusion sheet 56. Facing each other. As shown in FIGS.
  • the pair of left and right second panel side edge portions 64a and 64b facing the Y direction of the liquid crystal display panel 60 extend beyond both side edges of the base portion 43, and the boundary of the display area DA. It is bent toward the back side of the base portion 43 along the above.
  • the pair of bent second panel side edge portions 64a and 64b are attached to the back surface of the base portion 43 or the diffusion sheet 56.
  • the liquid crystal display panel 60 is attached to the support frame 42 in a curved state.
  • the second panel side edge portions 64a and 64b blackened by the black matrix layer or the like cover the left and right ends of the support frame 42 that supports the so-called backlight including the diffusion sheet 56, the left and right sides of the support frame 42 are covered. The generation of unexpected leakage light from the edge is prevented.
  • the four display devices 40 configured as described above are arranged in a state in which the side edges of the display surface 20a are butted parallel to the side edges of the adjacent display surface 20a, and have a cylindrical shape.
  • the display unit 14 is configured. That is, the display surfaces 20a of the four display devices 40 are continuous with almost no gap, and form a cylindrical display surface as a whole.
  • the illumination light emitted from the light guide plate LG of the backlight device 50 passes through the optical sheets OS1 and OS2, then enters the curved diffusion sheet 56, is diffused by the diffusion sheet 56, and is displayed on the liquid crystal display.
  • the entire surface of the display area DA of the panel 60 is irradiated almost evenly.
  • the display area DA of the liquid crystal display panel 60 displays an image on the display surface 20a by selectively transmitting the incident light.
  • the display device 40 constituting the display unit 14 employs a flat backlight device 50 having a flat light guide plate LG.
  • the curved liquid crystal display panel 60 is arranged so as to face the backlight device 50.
  • a curved diffusion sheet 56 is provided between the backlight device 50 and the liquid crystal display panel 60, and the liquid crystal display panel 60 is arranged on the diffusion sheet 56.
  • a curved surface display device that suppresses the occurrence of uneven brightness and has improved display quality can be obtained. It is possible to use a flat backlight device 50 in which the light guide plate LG is flat, the light sources (LEDs) can be easily evenly arranged, and the display quality such as the brightness distribution can be easily maintained. Even if the light guide plate LG remains flat, it can be applied to a curved surface display device having a different curvature by changing the curvature of the diffusion sheet 56. Since the manufacturing cost of the flat light guide plate LG is lower than the manufacturing cost of the curved light guide plate, the manufacturing cost of the entire display device can be suppressed to the same level as that of a normal flat display device. From the above, according to the first embodiment, it is possible to obtain a display device having a curved display surface and capable of reducing the manufacturing cost.
  • the space from the light guide plate is located between the center of the screen and the vicinity of the left and right sides of the screen.
  • the distance is different (center of screen> left and right sides). Therefore, the brightness distribution of the screen (display surface 20a) may be "the center of the screen ⁇ left and right sides".
  • the distance between the light emitting elements arranged at the center of the light guide plate LG may be made wider than the distance between the light emitting elements arranged at the end of the light guide plate LG.
  • FIG. 12 is a cross-sectional view showing a part of the display device according to the first modification.
  • the first modification shows an example embodying the above-mentioned countermeasure configuration 2).
  • the second diffusion sheet 56B is provided so as to cover both side edges of the light guide plate LG.
  • the diffusion sheet 56 is arranged so as to overlap the second diffusion sheet 56B and covers the second diffusion sheet 56B.
  • the light leaking from the side edge of the light guide plate LG and the light emitted from the side edge of the light guide plate LG can be diffused by the second diffusion sheet 56B and the diffusion sheet 56, and the diffusion sheet 56,
  • the diffusion rate of the entire 56B can be set to "center of screen ⁇ left and right sides".
  • FIG. 14 is a perspective view showing the display device according to the second embodiment.
  • the display device 10 is configured by arranging a plurality of, for example, three display devices 40 side by side, and the display unit has a concavely curved display surface 20a.
  • Each display device 40 has a support frame 42 and a liquid crystal display panel 60 supported by the support frame 42 and curved in a concave shape. By arranging the side edges of the three liquid crystal display panels 60 so as to be parallel to each other, a display unit having a concavely curved display surface 20a is formed.
  • FIG. 15 is an exploded perspective view of the display device constituting the display device 10
  • FIG. 16 is a perspective view of the display device
  • FIG. 17 is a cross-sectional view of the display device along the line DD of FIG.
  • FIG. 16 is a vertical cross-sectional view of the display device along the line CC of FIG.
  • the longitudinal direction of the display device is defined as the X direction
  • the width direction orthogonal to the longitudinal direction is defined as the Y direction.
  • the display device 40 is attached to a support frame 42 made of a metal such as aluminum, a flat backlight device 50 mounted on the support frame 42, and the support frame 42.
  • a diffusion sheet 56 that faces the backlight device 50 with a gap
  • a sheet-shaped liquid crystal display panel 60 that is attached to the support frame 42 and arranged so as to overlap the diffusion sheet 56.
  • the diffusion sheet 56 and the liquid crystal display panel 60 are concavely curved with respect to the backlight device 50.
  • the support frame 42 has a flat rectangular base portion 43, a lower flange portion 44 protruding from one short side portion of the base portion 43, and a lower flange portion 44 from the other short side portion of the base portion 43 in the same direction as the lower flange portion 44. It integrally has an upper flange portion 46 protruding from the base portion 43 and a pair of side wall portions 45 extending from the left and right side edges of the base portion 43. Both ends of each side wall portion 45 in the X direction are connected to the lower flange portion 44 and the upper flange portion 46.
  • the base portion 43 has a flat rectangular installation surface 43a for installing the backlight device 50.
  • the base portion 43 and the installation surface 43a are not limited to the rectangular plate shape, but may be formed into a hollow rectangular frame shape.
  • the lower flange portion 44 is provided substantially perpendicular to the installation surface 43a.
  • the lower flange portion 44 has an arc-shaped first support surface 44d that is concavely curved with respect to the installation surface 43a.
  • the first support surface 44d extends from one side wall portion 45 to the other side wall portion 45 and is formed in a band shape having a constant width. Screw holes SC1 are provided at both ends of the first support surface 44d in the Y direction.
  • the upper flange portion 46 is provided substantially perpendicular to the installation surface 43a.
  • the upper flange portion 46 faces the lower flange portion 44 substantially in parallel with the base portion 43 sandwiched between them.
  • the upper flange portion 46 has a second support surface 46a extending from one side wall portion 45 to the other side wall portion 45.
  • the second support surface 46a is formed in a band shape having a constant width.
  • the second support surface 46a is curved in a concave shape with respect to the installation surface 43a.
  • the second support surface 46a is formed to have the same radius of curvature as the first support surface 44d. Screw holes SC2 are provided at both ends of the second support surface 46a in the Y direction.
  • the backlight device 50 includes a rectangular plate-shaped light guide plate LG having a flat emission surface SA1, a plurality of light emitting elements (LEDs) 51 provided facing one side surface (incident surface) of the light guide plate LG, and a guide.
  • An optical sheet (prism sheet OS1 and diffusion sheet OS2) arranged so as to overlap the first main surface (exit surface) SA1 of the light plate LG and a second main surface (back surface) of the light guide plate LG are not shown. It has a reflective sheet and a frame (not shown) that supports them.
  • the LED 51 is mounted on the circuit board 52, and the circuit board 52 is fixed to the light guide plate LG and the frame.
  • the backlight device 50 is mounted on the installation surface 43a with the second main surface of the light guide plate LG facing the installation surface 43a.
  • the backlight device 50 is attached to the installation surface 43a with double-sided tape or an adhesive, and the light guide plate LG and the optical sheets 0S1 and S2 are arranged so as to face parallel to the installation surface 43a.
  • the diffusion sheet 56 is formed in a substantially rectangular shape, is attached to the support frame 42 in a curved state, and faces the backlight device 50.
  • the pair of upper and lower first side edge portions 55a and 55b of the diffusion sheet 56 facing in the X direction abut on the first support surface 44d and the second support surface 46a of the support frame 42, and the first support surface 44d and the second support surface 44d and the second support surface 46a. It is curved along the surface 46a.
  • the entire diffusion sheet 56 is concavely curved with respect to the installation surface 43a of the support frame 42, and faces the backlight device 50 with a gap.
  • Through holes 57 facing the screw holes SC1 and SC2 of the support frame 42 are provided at both ends of the first side edge portions 55a and 55b in the Y direction, respectively.
  • the pair of left and right second side edge portions 56a and 56b of the diffusion sheet 56 facing in the Y direction extend beyond the side wall portion 45 and are folded back to the outer surface side of the side wall portion 45.
  • the pair of second side edge portions 56a, 56b covers the extending ends of the pair of side wall portions 45.
  • the second side edge portions 56a and 56b are attached to the outer surface of the side wall portion 45, respectively.
  • the liquid crystal display panel 60 has substantially the same configuration as the liquid crystal display panel 60 in the first embodiment described above.
  • the liquid crystal display panel 60 is arranged so as to be overlapped with the diffusion sheet 56, and is curved in a concave shape along the diffusion sheet 56.
  • the first substrate SUB1 of the liquid crystal display panel 60 has a pair of upper and lower first panel side edges 61a and 61b facing each other in the X direction, and the upper and lower side edges 61a and 61b project in the X direction from the upper and lower side edges of the second substrate SUB2.
  • Through holes 62 facing the screw holes SC1 and SC2 of the support frame 42 are provided at both ends of the side edge portions 61a and 61b of the first panel in the Y direction, respectively.
  • the pair of upper and lower first panel side edges 61a and 61b abut on the first support surface 44d and the second support surface 46a of the support frame 42 via the diffusion sheet 56, and the first support surface 44d and the second support surface 46a. It is curved along. As a result, the entire liquid crystal display panel 60 is supported in a state of being convexly curved with respect to the installation surface 43a of the support frame 42, and the display area DA and the display surface 12a of the liquid crystal display panel 60 cover the entire surface of the diffusion sheet 56. Facing each other.
  • a pair of left and right second panel side edge portions 64a and 64b of the liquid crystal display panel 60 facing in the Y direction extend beyond the side wall portion 45 of the support frame 42, and extend along the boundary of the display area DA on the outer surface side of the side wall portion 45. It is folded into.
  • the pair of bent second panel side edge portions 64a and 64b are attached to the outer surface of the side wall portion 45 or the second side edge portions 56a and 56b of the diffusion sheet 56.
  • the support frame 42 includes a pair of holding plates 70a and 70b.
  • the pressing plates 70a and 70b are formed in a strip shape, and have a width and a length corresponding to the first support surface 44d and the second support surface 46a of the support frame 42, respectively.
  • the pressing plates 70a and 70b are curved with substantially the same curvature as the first support surface 44d and the second support surface 46a, respectively.
  • One holding plate 70a is arranged so as to be overlapped with the first panel side edge portion 61a of the liquid crystal display panel 60, and is screwed and fixed to the first support surface 44d by a pair of fixing screws.
  • Each fixing screw is screwed into the screw hole SC1 of the support frame 42 through the holding plate 70a, the through hole 62 at the side edge of the first panel, and the through hole 57 of the diffusion sheet 56.
  • the first panel side edge portion 61a of the liquid crystal display panel 60 and the first side edge portion 55a of the diffusion sheet 56 are pressed against the first support surface 44d by the pressing plate 70a and are held in a concavely curved state.
  • the other holding plate 70b is arranged so as to overlap the first panel side edge portion 61b of the liquid crystal display panel 60, and is screwed and fixed to the second support surface 46a by a pair of fixing screws.
  • Each fixing screw is screwed into the screw hole SC2 of the support frame 42 through the through hole 62 of the holding plate 70b, the side edge portion 61b of the first panel, and the through hole 57 of the diffusion sheet 56.
  • the first panel side edge 61b of the liquid crystal display panel 60 and the first side edge 55b of the diffusion sheet 56 are pressed against the second support surface 46a by the pressing plate 70b and are held in a concavely curved state.
  • the liquid crystal display panel 60 and the diffusion sheet 56 are attached to the support frame 42 in a concavely curved state with respect to the backlight device 50.
  • the three display devices 40 configured as described above are arranged in a state where the side edges of the display surface 20a are butted parallel to the side edges of the adjacent display surface 20a, and there is almost no gap. It constitutes a display device having a continuous concave curved display surface.
  • the display device 40 includes a flat backlight device 50 having a flat light guide plate LG, a diffusion sheet 56 curved in a concave shape, and a liquid crystal display. It has a panel 60.
  • the flat backlight device it is easy to evenly arrange the light sources (LEDs), and it is easy to maintain the display quality such as the brightness distribution. Since the manufacturing cost of the flat light guide plate is lower than the manufacturing cost of the curved light guide plate, the manufacturing cost of the entire display device can be suppressed to the same level as that of a normal flat display device. Therefore, according to the second embodiment, it is possible to obtain a display device having a curved display surface and capable of reducing the manufacturing cost.
  • the number of display devices constituting the display device is not limited to three or four, and can be increased or decreased as needed.
  • the support of the display device is not limited to the support frame described above, and may be any support having a shape and structure capable of supporting the diffusion sheet and the liquid crystal display panel in a curved state.
  • the support surface of the support is not limited to the continuous support surface, but may be an intermittently provided support surface.
  • the material of the constituent members of the display device is not limited to the above-mentioned example, and various materials can be selected.

Abstract

A display apparatus according to an embodiment of the present invention is provided with: a support body 42; a backlight device 50 having a light-guiding plate LG that has a flat light-outgoing surface SA1 and that is supported by the support body, and a light source that allows light to be incident on the light-guiding plate; a curved diffusion sheet 56 that is supported, in a state of being curved, by the support body and that opposes the light-outgoing surface of the light-guiding plate LG; and a liquid crystal display panel 60 that is disposed so as to oppose the diffusion sheet and that is supported, in a state of being curved, by the support body.

Description

表示装置Display device
　この発明の実施形態は、表示装置に関する。 An embodiment of the present invention relates to a display device.
　近年、表示面が湾曲した湾曲表示装置が提案されている。湾曲表示装置では、液晶表示パネルが湾曲して形成されているため、バックライト装置の導光体も液晶表示パネルの背面に沿うように湾曲している。
　液晶パネルのみならずバックライト装置まで湾曲させ、その状態を維持するのは容易ではなく、製造コストが増大する虞がある。 In recent years, a curved display device having a curved display surface has been proposed. In the curved display device, since the liquid crystal display panel is formed to be curved, the light guide body of the backlight device is also curved along the back surface of the liquid crystal display panel.
It is not easy to bend not only the liquid crystal panel but also the backlight device and maintain the state, and there is a risk that the manufacturing cost will increase.
特表２０１０－５０９７０７号公報Special Table 2010-509707 特開２００５－１３４４６１号公報Japanese Unexamined Patent Publication No. 2005-134461 国際公開第２００９／１５７１６１号International Publication No. 2009/157161
　ここで述べる実施形態の課題は、製造コストの低減を図ることが可能な湾曲した表示装置を提供することにある。 The problem of the embodiment described here is to provide a curved display device capable of reducing the manufacturing cost.
　実施形態に係る表示装置は、支持体と、平坦な出射面を有し前記支持体に支持された導光板と、前記導光板に光を入射する光源と、を有するバックライト装置と、前記支持体に湾曲した状態で支持され前記導光板の出射面に対向する拡散シートと、前記拡散シートに対向して配置され、前記支持体に湾曲した状態で支持される液晶表示パネルと、を備えている。 The display device according to the embodiment includes a backlight device having a support, a light guide plate having a flat emission surface and being supported by the support, and a light source that allows light to enter the light guide plate, and the support. A diffusion sheet that is supported in a curved state on the body and faces the exit surface of the light guide plate, and a liquid crystal display panel that is arranged facing the diffusion sheet and supported in a curved state on the support. There is.
図１は、第１実施形態に係る表示デバイスの外観を示す斜視図。FIG. 1 is a perspective view showing the appearance of the display device according to the first embodiment. 図２は、前記表示デバイスを長手方向に破断して示す斜視図。FIG. 2 is a perspective view showing the display device broken in the longitudinal direction. 図３は、前記表示デバイスを長手方向と直交する方向に破断して示す斜視図。FIG. 3 is a perspective view showing the display device broken in a direction orthogonal to the longitudinal direction. 図４は、前記表示デバイスの表示部を示す斜視図。FIG. 4 is a perspective view showing a display unit of the display device. 図５は、前記表示部を構成する表示装置の分解斜視図。FIG. 5 is an exploded perspective view of the display device constituting the display unit. 図６は、前記表示装置の支持フレームおよびバックライト装置を示す斜視図。FIG. 6 is a perspective view showing a support frame and a backlight device of the display device. 図７は、前記表示装置の支持フレーム拡散シートおよび液晶表示パネルを示す分解斜視図。FIG. 7 is an exploded perspective view showing a support frame diffusion sheet and a liquid crystal display panel of the display device. 図８は、前記表示装置の斜視図。FIG. 8 is a perspective view of the display device. 図９は、前記表示装置の液晶表示パネルの一例を概略的に示す断面図。FIG. 9 is a cross-sectional view schematically showing an example of a liquid crystal display panel of the display device. 図１０は、図８の線Ａ－Ａに沿った前記表示装置の縦断面図。FIG. 10 is a vertical sectional view of the display device along the line AA of FIG. 図１１は、図８の線Ｂ－Ｂに沿った前記表示装置の横断面図。FIG. 11 is a cross-sectional view of the display device along the line BB of FIG. 図１２は、図１１の一部を拡大して示す前記表示装置の断面図。FIG. 12 is a cross-sectional view of the display device showing a part of FIG. 11 in an enlarged manner. 図１３は、第１変形例に係る表示装置の一部を拡大して示す断面図。FIG. 13 is an enlarged cross-sectional view showing a part of the display device according to the first modification. 図１４は、第２実施形態に係る表示デバイスを示す斜視図。FIG. 14 is a perspective view showing a display device according to the second embodiment. 図１５は、第２実施形態に係る表示デバイスを構成する表示装置の分解斜視図。FIG. 15 is an exploded perspective view of a display device constituting the display device according to the second embodiment. 図１６は、第２実施形態に係る前記表示装置を示す斜視図。FIG. 16 is a perspective view showing the display device according to the second embodiment. 図１７は、図１６の線Ｄ－Ｄに沿った前記表示装置の横断面図。FIG. 17 is a cross-sectional view of the display device along the line DD of FIG. 図１８は、図１６の線Ｃ－Ｃに沿った前記表示装置の縦断面図。FIG. 18 is a vertical sectional view of the display device along the line CC of FIG.
　以下、図面を参照しながら、この発明の実施形態について詳細に説明する。　
　なお、開示はあくまで一例にすぎず、当業者において、発明の主旨を保っての適宜変更であって容易に想到し得るものについては、当然に本発明の範囲に含有されるものである。また、図面は説明をより明確にするため、実際の態様に比べ、各部の幅、厚さ、形状等について模式的に表される場合があるが、あくまで一例であって、本発明の解釈を限定するものではない。また、本明細書と各図において、既出の図に関して前述したものと同様の要素には、同一の符号を付して、詳細な説明を適宜省略することがある。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
It should be noted that the disclosure is merely an example, and those skilled in the art who are appropriately modified while maintaining the gist of the invention and which can be easily conceived are naturally included in the scope of the present invention. Further, in order to clarify the explanation, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the actual embodiment, but this is just an example, and the interpretation of the present invention is used. It is not limited. Further, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures may be designated by the same reference numerals, and detailed description thereof may be omitted as appropriate.
　（第１実施形態）　
　図１は、第１実施形態に係る表示デバイスの外観を示す斜視図である。
　本実施形態によれば、表示デバイス１０は、一例として、円筒状に形成された表示部１４を有し、全方位に向かって画像を表示可能な表示デバイスとして構成されている。
　図１に示すように、表示デバイス１０は、ほぼ円柱形状の筐体１２と、筐体１２の軸方向一端に支持され、筐体１２とほぼ同軸的に立設されたほぼ円筒状の表示部１４と、光透過性を有する円筒形状の保護カバー１６と、を備えている。保護カバー１６は、軸方向一端が筐体１２に固定され、表示部１４と同軸的に筐体１２に立設されている。保護カバー１６は、表示部１４の外周に隙間を置いて配置され、表示部１４の表示面１２ａ全体を覆っている。表示部１４の延出端および保護カバー１６の延出端に円盤状のトップカバー１８が固定されている。トップカバー１８は、保護カバー１６と表示部１４との間の空間部を覆った光透過性を有する環状の外周部１８Ａと、合成樹脂等で形成され表示部１４の延出端を覆う円盤状の中心部１８Ｂと、を有している。 (First Embodiment)
FIG. 1 is a perspective view showing the appearance of the display device according to the first embodiment.
According to the present embodiment, as an example, the display device 10 has a display unit 14 formed in a cylindrical shape, and is configured as a display device capable of displaying an image in all directions.
As shown in FIG. 1, the display device 10 has a substantially cylindrical housing 12 and a substantially cylindrical display unit supported by one end of the housing 12 in the axial direction and erected substantially coaxially with the housing 12. A 14 and a cylindrical protective cover 16 having light transmission are provided. One end of the protective cover 16 in the axial direction is fixed to the housing 12, and the protective cover 16 is erected on the housing 12 coaxially with the display unit 14. The protective cover 16 is arranged with a gap on the outer periphery of the display unit 14 and covers the entire display surface 12a of the display unit 14. A disk-shaped top cover 18 is fixed to the extending end of the display unit 14 and the extending end of the protective cover 16. The top cover 18 has an annular outer peripheral portion 18A that covers the space between the protective cover 16 and the display portion 14, and a disk shape that is formed of synthetic resin or the like and covers the extending end of the display portion 14. It has a central portion 18B of the.
　図２は、表示デバイス１０を長手方向に破断して示す斜視図、図３は、表示デバイス１０を長手方向と直交する方向に破断して示す斜視図、図４は、表示部１４を示す斜視図である。
　図２、図３、図４に示すように、表示部１４は、複数、例えば、４つの表示装置４０を有している。４つの表示装置４０を並べて配置することにより、円筒形状の表示面２０ａを有する表示部１４を構成している。各表示装置４０は、支持フレーム４２と、支持フレーム４２上に載置された平坦なバックライト装置５０と、支持フレーム４２に取付けられバックライト装置５０に対向したシート状の液晶表示パネル６０と、を備えている。液晶表示パネル６０は、バックライト装置５０に対し凸状に湾曲している。
　４つの表示装置４０は、側縁同士を突き合わせた状態で円筒状に配列され、４つの湾曲した液晶表示パネル６０により、連続した円筒状の表示面２０ａを構成している。２分割されたリング状の第１保持枠２２が４つの支持フレーム４２の下部フランジ部４４に嵌合されている。また、リング状の第２保持枠２４が４つの支持フレーム４２２の上部フランジ部４６にねじ止め固定されている。４つの表示装置４０は、これら第１および第２保持枠２２、２４により、円筒状に並べて配置された状態に保持されている。 FIG. 2 is a perspective view showing the display device 10 broken in the longitudinal direction, FIG. 3 is a perspective view showing the display device 10 broken in the direction orthogonal to the longitudinal direction, and FIG. 4 is a perspective view showing the display unit 14. It is a figure.
As shown in FIGS. 2, 3 and 4, the display unit 14 has a plurality of, for example, four display devices 40. By arranging the four display devices 40 side by side, a display unit 14 having a cylindrical display surface 20a is formed. Each display device 40 includes a support frame 42, a flat backlight device 50 mounted on the support frame 42, a sheet-shaped liquid crystal display panel 60 attached to the support frame 42 and facing the backlight device 50, and the like. It has. The liquid crystal display panel 60 is curved in a convex shape with respect to the backlight device 50.
The four display devices 40 are arranged in a cylindrical shape with the side edges abutting each other, and the four curved liquid crystal display panels 60 form a continuous cylindrical display surface 20a. The ring-shaped first holding frame 22 divided into two is fitted to the lower flange portion 44 of the four support frames 42. Further, the ring-shaped second holding frame 24 is screwed and fixed to the upper flange portion 46 of the four support frames 422. The four display devices 40 are held in a state of being arranged side by side in a cylindrical shape by the first and second holding frames 22 and 24.
　図２および図３に示すように、上記のように構成された表示部１４は、下部フランジ部４４を筐体１２の上部開口に嵌合した状態で筐体１２に取付けられている。下部フランジ部４４は支持ブラケット４７を介して筐体１２の底壁に連結されている。筐体１２内には、図示しない駆動素子等の電子部品が実装された制御回路基板、バッテリ、スピーカ等が収容されている。各表示装置４０の液晶表示パネル６０およびバックライト装置５０から導出している配線（ＦＰＣ）４８は、表示部１４の内部を通って筐体１２内に延出し、制御回路基板に電気的に接続される。 As shown in FIGS. 2 and 3, the display unit 14 configured as described above is attached to the housing 12 with the lower flange portion 44 fitted to the upper opening of the housing 12. The lower flange portion 44 is connected to the bottom wall of the housing 12 via a support bracket 47. A control circuit board, a battery, a speaker, and the like on which electronic components such as drive elements (not shown) are mounted are housed in the housing 12. The wiring (FPC) 48 derived from the liquid crystal display panel 60 and the backlight device 50 of each display device 40 extends into the housing 12 through the inside of the display unit 14 and is electrically connected to the control circuit board. Will be done.
　次に、表示装置４０について詳細に説明する。
　図５は表示装置の分解斜視図である。図において、表示装置４０の長手方向をＸ方向、長手方向と直交する幅方向をＹ方向と定義している。　
　図５に示すように、表示装置４０は、支持体としての支持フレーム４２と、支持フレーム４２に取付けられるバックライト装置５０と、バックライト装置５０に対向して配置される湾曲した拡散シート５６と、拡散シート５６に重ねて配置され拡散シートに沿って湾曲した液晶表示パネル６０と、を備えている。 Next, the display device 40 will be described in detail.
FIG. 5 is an exploded perspective view of the display device. In the figure, the longitudinal direction of the display device 40 is defined as the X direction, and the width direction orthogonal to the longitudinal direction is defined as the Y direction.
As shown in FIG. 5, the display device 40 includes a support frame 42 as a support, a backlight device 50 attached to the support frame 42, and a curved diffusion sheet 56 arranged to face the backlight device 50. The liquid crystal display panel 60, which is arranged on the diffusion sheet 56 and curved along the diffusion sheet, is provided.
　支持フレーム４２は、一例では、アルミニウム等の金属材料で形成されている。支持フレーム４２は、平坦な矩形板状のベース部４３と、ベース部４３の一方の短辺部から突出した下部フランジ部４４と、ベース部４３の他方の短辺部から下部フランジ部４４と同一方向に突出した上部フランジ部４６と、を一体に有している。ベース部４３は、バックライト装置５０を設置するための平坦な矩形状の設置面４３ａを有している。なお、ベース部４３および設置面４３ａは、矩形板状に限らず、中空の矩形枠状に形成してもよい。
　下部フランジ部４４は設置面４３ａに対してほぼ垂直に設けられている。下部フランジ部４４は、設置面４３ａに対して凸状に湾曲した円弧状の先端面４４ａと、ほぼ中央に設けられた係合孔４４ｂと、係合孔４４ｂの両側に設けられ先端面４４ａに開口した一対のスリット４４ｃと、設置面４３ａと係合孔４４ｂとの間に位置する円弧状に湾曲した第１支持面４４ｄと、を有している。第１支持面４４ｄは、ベース部４３の短辺側の一端から他端まで延在し、一定の幅を有する帯状に形成されている。第１支持面４４ｄは、設置面４３ａに対して凸状に湾曲している。係合孔４４ｂおよびスリット４４ｃに前述した第１保持枠２２の爪２２ａを係合することができる。 The support frame 42 is, for example, made of a metal material such as aluminum. The support frame 42 is the same as the flat rectangular plate-shaped base portion 43, the lower flange portion 44 protruding from one short side portion of the base portion 43, and the lower flange portion 44 from the other short side portion of the base portion 43. It integrally has an upper flange portion 46 projecting in the direction. The base portion 43 has a flat rectangular installation surface 43a for installing the backlight device 50. The base portion 43 and the installation surface 43a are not limited to the rectangular plate shape, but may be formed into a hollow rectangular frame shape.
The lower flange portion 44 is provided substantially perpendicular to the installation surface 43a. The lower flange portion 44 is provided on both sides of an arc-shaped tip surface 44a that is curved convexly with respect to the installation surface 43a, an engagement hole 44b provided at substantially the center, and the tip surface 44a. It has a pair of open slits 44c and a first support surface 44d curved in an arc shape located between the installation surface 43a and the engagement hole 44b. The first support surface 44d extends from one end to the other end on the short side side of the base portion 43, and is formed in a band shape having a constant width. The first support surface 44d is curved in a convex shape with respect to the installation surface 43a. The claw 22a of the first holding frame 22 described above can be engaged with the engagement hole 44b and the slit 44c.
　上部フランジ部４６は、設置面４３ａに対してほぼ垂直に設けられている。上部フランジ部４６は、ベース部４３を間に挟んで下部フランジ部４４とほぼ平行に対向している。上部フランジ部４６は、ベース部４３の他方の短辺側の一端から他端まで延在する第２支持面４６ａを有している。第２支持面４６ａは、一定の幅を有する帯状に形成されている。第２支持面４６ａは、設置面４３ａに対して凸状に湾曲している。第２支持面４６ａは、第１支持面４４ｄと同一の曲率半径に形成されている。 The upper flange portion 46 is provided substantially perpendicular to the installation surface 43a. The upper flange portion 46 faces the lower flange portion 44 substantially in parallel with the base portion 43 sandwiched between them. The upper flange portion 46 has a second support surface 46a extending from one end to the other end on the other short side of the base portion 43. The second support surface 46a is formed in a band shape having a constant width. The second support surface 46a is curved in a convex shape with respect to the installation surface 43a. The second support surface 46a is formed to have the same radius of curvature as the first support surface 44d.
　バックライト装置５０は、平坦な第１主面（出射面）ＳＡ１を有する矩形平板状の導光板ＬＧと、導光板ＬＧの一側面（入射面）に対向して設けられた光源、例えば、複数の発光素子（ＬＥＤ）５１と、導光板ＬＧの出射面ＳＡ１に重ねて配置される光学シート（プリズムシートＯＳ１および拡散シートＯＳ２）と、導光板ＬＧの第２主面（背面）に対向して設けられる図示しない反射シートと、これらを支持する図示しないフレームと、を有している。ＬＥＤ５１は回路基板５２に実装され、この回路基板５２は導光板ＬＧおよびフレームに固定されている。
　図６は、支持フレームおよびバックライト装置を示す斜視図である。図示のように、バックライト装置５０は、導光板ＬＧの第２主面が設置面４３ａに対向した状態で、設置面４３ａ上に載置されている。バックライト装置５０は、両面テープあるいは接着剤により設置面４３ａに貼付され、導光板ＬＧおよび光学シート０Ｓ１、Ｓ２は、設置面４３ａと平行に対向して配置されている。 The backlight device 50 includes a rectangular flat plate-shaped light guide plate LG having a flat first main surface (emission surface) SA1 and a light source provided so as to face one side surface (incident surface) of the light guide plate LG, for example, a plurality of light sources. The light emitting element (LED) 51 of the light guide plate LG, the optical sheet (prism sheet OS1 and the diffusion sheet OS2) arranged so as to overlap the exit surface SA1 of the light guide plate LG, and the second main surface (back surface) of the light guide plate LG are opposed to each other. It has a reflective sheet (not shown) provided and a frame (not shown) that supports them. The LED 51 is mounted on the circuit board 52, and the circuit board 52 is fixed to the light guide plate LG and the frame.
FIG. 6 is a perspective view showing a support frame and a backlight device. As shown in the figure, the backlight device 50 is mounted on the installation surface 43a with the second main surface of the light guide plate LG facing the installation surface 43a. The backlight device 50 is attached to the installation surface 43a with double-sided tape or an adhesive, and the light guide plate LG and the optical sheets 0S1 and S2 are arranged so as to face parallel to the installation surface 43a.
　図７は、支持フレーム、支持フレームに取付けられた拡散シート、および液晶表示パネルを示す分解斜視図である。図５および図７に示すように、拡散シート５６は、ほぼ矩形状に形成され、湾曲した状態で支持フレーム４２に取付けられ導光板ＬＧの出射面ＳＡ１および光学シートＯＳ１、ＯＳ２と対向している。拡散シート５６は、一例として、乳白色のシリコンゴムシートを用いている。拡散シート５６のＸ方向に対向する上下一対の第１側縁部５５ａ、５５ｂは、支持フレーム４２の第１支持面４４ｄおよび第２支持面４６ａに当接し、第１支持面４４ｄおよび第２支持面４６ａに沿って湾曲している。これにより、拡散シート５６全体は、支持フレーム４２の設置面４３ａに対して凸状に湾曲し、バックライト装置５０に隙間を置いて対向している。また、拡散シート５６のＹ方向に対向する左右一対の第２側縁部５６ａ、５６ｂは、ベース部４３の両側縁を越えて延出し、ベース部４３の背面側に折り返されている。一対の第２側縁部５６ａ、５６ｂは、バックライト装置５０の対向する一対の側縁部を覆っている。拡散シート５６は、例えば、一対の第２側縁部５６ａ、５６ｂをベース部４３の背面に貼付することにより、湾曲した状態で支持フレーム４２に取付けられている。 FIG. 7 is an exploded perspective view showing a support frame, a diffusion sheet attached to the support frame, and a liquid crystal display panel. As shown in FIGS. 5 and 7, the diffusion sheet 56 is formed in a substantially rectangular shape, is attached to the support frame 42 in a curved state, and faces the exit surface SA1 of the light guide plate LG and the optical sheets OS1 and OS2. .. As an example, the diffusion sheet 56 uses a milky white silicone rubber sheet. The pair of upper and lower first side edge portions 55a and 55b of the diffusion sheet 56 facing in the X direction abut on the first support surface 44d and the second support surface 46a of the support frame 42, and the first support surface 44d and the second support surface 44d and the second support surface 46a. It is curved along the surface 46a. As a result, the entire diffusion sheet 56 is curved convexly with respect to the installation surface 43a of the support frame 42, and faces the backlight device 50 with a gap. Further, the pair of left and right second side edge portions 56a and 56b of the diffusion sheet 56 facing in the Y direction extend beyond both side edges of the base portion 43 and are folded back to the back surface side of the base portion 43. The pair of second side edge portions 56a and 56b cover the pair of opposite side edge portions of the backlight device 50. The diffusion sheet 56 is attached to the support frame 42 in a curved state by, for example, attaching a pair of second side edge portions 56a and 56b to the back surface of the base portion 43.
　次に、液晶表示パネル６０の構成について説明する。図９は、液晶表示パネルの一例を模式的に示す断面図である。図示のように、液晶表示パネル６０は、矩形状の第１基板ＳＵＢ１と、第１基板ＳＵＢ１に対向配置された矩形状の第２基板ＳＵＢ２と、第１基板ＳＵＢ１と第２基板ＳＵＢ２との間に封入された液晶層ＬＱと、を備えている。第１基板ＳＵＢ１および第２基板ＳＵＢ２は、それぞれ、合成樹脂、例えば、ポリイミド等で形成された可撓性および光透過性を有する絶縁基板により構成されている。第２基板ＳＵＢ２の周縁部は、シール材ＳＥにより第１基板ＳＵＢ１に貼り合わされている。第２基板ＳＵＢ２の表面に偏光板ＰＬ２が貼付され、液晶表示パネル６０の表示面２０ａを形成している。第１基板ＳＵＢ１の表面（液晶表示パネル６０の背面）に偏光板ＰＬ１が貼付されている。 Next, the configuration of the liquid crystal display panel 60 will be described. FIG. 9 is a cross-sectional view schematically showing an example of a liquid crystal display panel. As shown in the figure, the liquid crystal display panel 60 is formed between the rectangular first substrate SUB1 and the rectangular second substrate SUB2 arranged to face the first substrate SUB1 and between the first substrate SUB1 and the second substrate SUB2. The liquid crystal layer LQ enclosed in is provided. The first substrate SUB1 and the second substrate SUB2 are each composed of a flexible and light-transmitting insulating substrate made of a synthetic resin, for example, polyimide or the like. The peripheral edge of the second substrate SUB2 is attached to the first substrate SUB1 by the sealing material SE. The polarizing plate PL2 is attached to the surface of the second substrate SUB2 to form the display surface 20a of the liquid crystal display panel 60. The polarizing plate PL1 is attached to the surface of the first substrate SUB1 (the back surface of the liquid crystal display panel 60).
　図示の例では、第２基板ＳＵＢ２は、第１基板ＳＵＢ１とほぼ同一の長さおよび第１基板ＳＵＢ１の幅よりも短い幅に形成されている。貼り合わせた状態において、第１基板ＳＵＢ１の幅方向（Ｙ方向）に対向する一対の側縁部６４ａ、６４ｂは、それぞれ第２基板ＳＵＢ２の側縁を越えて外側に突出している。一対の側縁部６４ａ、６４ｂは、それぞれブラックマトリクス層等で黒色化されている。長手方向Ｘにおいては、第２基板ＳＵＢ２の一対の短辺は、第１基板ＳＵＢ１の一対の短辺とほぼ面一に整列している。
　液晶層ＬＱは、第１基板ＳＵＢ１と第２基板ＳＵＢ２との間のセルギャップにおいて、シール材ＳＥによって囲まれた領域に封入されている。 In the illustrated example, the second substrate SUB2 is formed to have substantially the same length as the first substrate SUB1 and a width shorter than the width of the first substrate SUB1. In the bonded state, the pair of side edge portions 64a and 64b facing the width direction (Y direction) of the first substrate SUB1 project outward beyond the side edges of the second substrate SUB2, respectively. The pair of side edge portions 64a and 64b are each blackened with a black matrix layer or the like. In the longitudinal direction X, the pair of short sides of the second substrate SUB2 are substantially flush with the pair of short sides of the first substrate SUB1.
The liquid crystal layer LQ is enclosed in a region surrounded by the sealing material SE in the cell gap between the first substrate SUB1 and the second substrate SUB2.
　平面視（液晶表示パネル６０の表面に垂直な方向から液晶表示パネル６０の表面中央部を視認する状態を言う）でシール材ＳＥの内側となる領域に、画像を表示する表示領域（アクティブ領域）ＤＡが設けられている。表示領域ＤＡにおいて、第１基板ＳＵＢ１の内面上に複数の画素電極ＰＥ、図示しない複数の配線（信号線、ゲート線）、複数のスイッチング素子等が設けられている。一部の配線ＷＬは、シール材ＳＥを通して第１基板ＳＵＢ１のＹ方向の一端まで導出している。これらの配線ＷＬに前述したＦＰＣ４８が接続される。
　表示領域ＤＡにおいて、第２基板ＳＵＢ２の内面上に共通電極ＣＥ、図示しないカラーフィルタ等が設けられている。共通電極ＣＥは、液晶層ＬＱを挟んで複数の画素電極ＰＥに対向している。共通電極ＣＥおよび画素電極ＰＥは、ＩＴＯ（インジウム・ティン・オキサイド）等の透明な導電材料で形成された透明電極を用いている。
　液晶表示パネル６０は、バックライト装置５０からの光を表示領域ＤＡに選択的に透過させることで画像を表示する透過表示機能を備えている。また、液晶表示パネル６０は、可撓性を有する、すなわち、曲げることが可能な、いわゆるシートディスプレイを構成している。更に、液晶表示パネル６０は、後述するＸ方向に対向した一対の第１パネル側縁部６１ａ、６１ｂとＹ方向に対向する一対の第２パネル側縁部６４ａ、６４ｂとを有している。第２パネル側縁部６４ａ、６４ｂは、表示領域ＤＡの境界に沿って、パネルの背面側に折曲げ可能に形成されている。 A display area (active area) for displaying an image in a region inside the sealing material SE in a plan view (a state in which the central portion of the surface of the liquid crystal display panel 60 is visually recognized from a direction perpendicular to the surface of the liquid crystal display panel 60). DA is provided. In the display area DA, a plurality of pixel electrode PEs, a plurality of wirings (signal lines, gate lines), a plurality of switching elements, and the like (not shown) are provided on the inner surface of the first substrate SUB1. Some wiring WLs are led out to one end in the Y direction of the first substrate SUB1 through the sealing material SE. The FPC 48 described above is connected to these wiring WLs.
In the display area DA, a common electrode CE, a color filter (not shown), and the like are provided on the inner surface of the second substrate SUB2. The common electrode CE faces a plurality of pixel electrodes PE with the liquid crystal layer LQ interposed therebetween. As the common electrode CE and the pixel electrode PE, a transparent electrode formed of a transparent conductive material such as ITO (indium tin oxide) is used.
The liquid crystal display panel 60 has a transmission display function of displaying an image by selectively transmitting light from the backlight device 50 to the display area DA. Further, the liquid crystal display panel 60 constitutes a so-called sheet display which is flexible, that is, can be bent. Further, the liquid crystal display panel 60 has a pair of first panel side edge portions 61a and 61b facing in the X direction and a pair of second panel side edge portions 64a and 64b facing in the Y direction, which will be described later. The second panel side edge portions 64a and 64b are formed so as to be bendable on the back surface side of the panel along the boundary of the display area DA.
　図８は、液晶表示パネルが取り付けられた表示装置を示す斜視図、図１０は図８の線Ａ－Ａに沿った表示装置の縦断面図、図１１は、図８の線Ｂ－Ｂに沿った表示装置の横断面図、図１２は、図１１の一部（パネル側縁部）を拡大して示す表示装置の断面図である。
　図７、図８、図１０、図１１に示すように、液晶表示パネル６０は、拡散シート５６に
重ねて配置され、拡散シート５６に沿って凸状に湾曲している。液晶表示パネル６０は、第２基板ＳＵＢ２が拡散シート５６の表面に対向した状態で配置されている。液晶表示パネル６０のＸ方向に対向する上下一対の第１パネル側縁部６１ａ、６１ｂは、拡散シート５６を介して支持フレーム４２の第１支持面４４ｄおよび第２支持面４６ａに当接し、第１支持面４４ｄおよび第２支持面４６ａに沿って湾曲している。これにより、液晶表示パネル６０全体は、支持フレーム４２の設置面４３ａに対して凸状に湾曲した状態に支持され、液晶表示パネル６０の表示領域ＤＡおよび表示面１２ａは、拡散シート５６の全面に対向している。図１１および図１２に示すように、液晶表示パネル６０のＹ方向に対向する左右一対の第２パネル側縁部６４ａ、６４ｂはベース部４３の両側縁を越えて延出し、表示領域ＤＡの境界に沿ってベース部４３の背面側に折り曲げられている。折り曲げられた一対の第２パネル側縁部６４ａ、６４ｂは、ベース部４３の背面あるいは拡散シート５６に貼付される。これにより、液晶表示パネル６０は、湾曲した状態で支持フレーム４２に取付けられている。また、ブラックマトリクス層等で黒色化された第２パネル側縁部６４ａ、６４ｂにより拡散シート５６を含んで所謂バックライトを支持する支持フレーム４２の左右端を覆っているため、支持フレーム４２の左右端からの不測の漏れ光の発生が防止される。 8 is a perspective view showing a display device to which a liquid crystal display panel is attached, FIG. 10 is a vertical sectional view of the display device along the line AA of FIG. 8, and FIG. 11 is a line BB of FIG. A cross-sectional view of the display device along the line, FIG. 12, is a cross-sectional view of the display device showing a part (panel side edge) of FIG. 11 in an enlarged manner.
As shown in FIGS. 7, 8, 10, and 11, the liquid crystal display panel 60 is arranged so as to be overlapped with the diffusion sheet 56, and is curved in a convex shape along the diffusion sheet 56. The liquid crystal display panel 60 is arranged with the second substrate SUB2 facing the surface of the diffusion sheet 56. The pair of upper and lower first panel side edges 61a and 61b of the liquid crystal display panel 60 facing in the X direction come into contact with the first support surface 44d and the second support surface 46a of the support frame 42 via the diffusion sheet 56, and the first one. It is curved along the 1 support surface 44d and the 2nd support surface 46a. As a result, the entire liquid crystal display panel 60 is supported in a state of being convexly curved with respect to the installation surface 43a of the support frame 42, and the display area DA and the display surface 12a of the liquid crystal display panel 60 cover the entire surface of the diffusion sheet 56. Facing each other. As shown in FIGS. 11 and 12, the pair of left and right second panel side edge portions 64a and 64b facing the Y direction of the liquid crystal display panel 60 extend beyond both side edges of the base portion 43, and the boundary of the display area DA. It is bent toward the back side of the base portion 43 along the above. The pair of bent second panel side edge portions 64a and 64b are attached to the back surface of the base portion 43 or the diffusion sheet 56. As a result, the liquid crystal display panel 60 is attached to the support frame 42 in a curved state. Further, since the second panel side edge portions 64a and 64b blackened by the black matrix layer or the like cover the left and right ends of the support frame 42 that supports the so-called backlight including the diffusion sheet 56, the left and right sides of the support frame 42 are covered. The generation of unexpected leakage light from the edge is prevented.
　上記のように構成された４つの表示装置４０は、図４に示したように、表示面２０ａの側縁を隣の表示面２０ａの側縁と平行に突き合わせた状態に配列され、円筒形状の表示部１４を構成している。すなわち、４つの表示装置４０の表示面２０ａは、ほぼ隙間なく連続し、全体として円筒形状の表示面を構成している。
　上記構成の表示装置４０において、バックライト装置５０の導光板ＬＧから出射した照明光は、光学シートＯＳ１、ＯＳ２を透過した後、湾曲した拡散シート５６に入射し、拡散シート５６により拡散され液晶表示パネル６０の表示領域ＤＡの全面にほぼ均等に照射される。液晶表示パネル６０の表示領域ＤＡは、入射した光を選択的に透過させることで表示面２０ａに画像を表示する。 As shown in FIG. 4, the four display devices 40 configured as described above are arranged in a state in which the side edges of the display surface 20a are butted parallel to the side edges of the adjacent display surface 20a, and have a cylindrical shape. The display unit 14 is configured. That is, the display surfaces 20a of the four display devices 40 are continuous with almost no gap, and form a cylindrical display surface as a whole.
In the display device 40 having the above configuration, the illumination light emitted from the light guide plate LG of the backlight device 50 passes through the optical sheets OS1 and OS2, then enters the curved diffusion sheet 56, is diffused by the diffusion sheet 56, and is displayed on the liquid crystal display. The entire surface of the display area DA of the panel 60 is irradiated almost evenly. The display area DA of the liquid crystal display panel 60 displays an image on the display surface 20a by selectively transmitting the incident light.
　以上のように構成された第１実施形態に係る表示デバイス１０によれば、表示部１４を構成している表示装置４０は、平坦な導光板ＬＧを有する平面型のバックライト装置５０を採用し、湾曲した液晶表示パネル６０をバックライト装置５０に対向して配置している。バックライト装置５０と液晶表示パネル６０との間に湾曲した拡散シート５６を設け、この拡散シート５６に重ねて液晶表示パネル６０を配置している。
　このように平坦な導光板ＬＧと湾曲した液晶表示パネル６０とを組み合わせた場合でも、バックライト装置５０から出射された照明光を湾曲した拡散シート５６により拡散し、液晶表示パネル６０全体にほぼ均一な照明光を照射することができる。これにより、輝度ムラの発生を抑制し、表示品位の向上した曲面表示装置が得られる。
　導光板ＬＧが平面である平面型のバックライト装置５０を用いることが可能となり、光源（ＬＥＤ）の均等配置が容易で、輝度分布などの表示品位を維持しやすい。導光板ＬＧが平坦のままでも、拡散シート５６の曲率を変えることにより、曲率の異なる曲面表示装置に適用することができる。平坦な導光板ＬＧの製造コストは湾曲した導光板の製造コストに比較して安価であることから、表示装置全体の製造コストを通常の平面表示装置と同等程度に抑えることができる。　
　以上のことから、第１実施形態によれば、湾曲した表示面を有し、製造コストの低減を図ることが可能な表示装置が得られる。 According to the display device 10 according to the first embodiment configured as described above, the display device 40 constituting the display unit 14 employs a flat backlight device 50 having a flat light guide plate LG. , The curved liquid crystal display panel 60 is arranged so as to face the backlight device 50. A curved diffusion sheet 56 is provided between the backlight device 50 and the liquid crystal display panel 60, and the liquid crystal display panel 60 is arranged on the diffusion sheet 56.
Even when the flat light guide plate LG and the curved liquid crystal display panel 60 are combined in this way, the illumination light emitted from the backlight device 50 is diffused by the curved diffusion sheet 56 and is substantially uniform over the entire liquid crystal display panel 60. It is possible to irradiate various illumination lights. As a result, a curved surface display device that suppresses the occurrence of uneven brightness and has improved display quality can be obtained.
It is possible to use a flat backlight device 50 in which the light guide plate LG is flat, the light sources (LEDs) can be easily evenly arranged, and the display quality such as the brightness distribution can be easily maintained. Even if the light guide plate LG remains flat, it can be applied to a curved surface display device having a different curvature by changing the curvature of the diffusion sheet 56. Since the manufacturing cost of the flat light guide plate LG is lower than the manufacturing cost of the curved light guide plate, the manufacturing cost of the entire display device can be suppressed to the same level as that of a normal flat display device.
From the above, according to the first embodiment, it is possible to obtain a display device having a curved display surface and capable of reducing the manufacturing cost.
　なお、上述した表示装置４０において、平面型のバックライト装置５０と湾曲した拡散シート５６および液晶表示パネル６０とを組み合わせた場合、画面中央部と画面の左右辺付近とでは、導光板からの空間距離が異なる（画面中央部＞左右辺）。そのため、画面（表示面２０ａ）の輝度分布が「画面中央部＜左右辺」となる場合がある。このような場合、次のような対策構成を用いることが望ましい。　
　１）導光板ＬＧの輝度分布を「画面中央部＞左右辺」とすることにより、表示面２０ａの輝度分布を均一に調整することが有効である。より具体的には、導光板ＬＧの中央に配置される発光素子間の間隔を導光板ＬＧの端部に配置される発光素子間の間隔よりも広くすることが挙げられる。　
　２）複数の拡散シートを重ねて配置し、拡散シートの拡散率を「画面中央部＜左右辺」とすることが有効である。別の対策として、単一の拡散シートについて、中央部の拡散率を左右辺側の拡散率よりも小さくすることが挙げられる。 In the above-mentioned display device 40, when the flat backlight device 50, the curved diffusion sheet 56, and the liquid crystal display panel 60 are combined, the space from the light guide plate is located between the center of the screen and the vicinity of the left and right sides of the screen. The distance is different (center of screen> left and right sides). Therefore, the brightness distribution of the screen (display surface 20a) may be "the center of the screen <left and right sides". In such a case, it is desirable to use the following countermeasure configuration.
1) It is effective to uniformly adjust the brightness distribution of the display surface 20a by setting the brightness distribution of the light guide plate LG to "center of screen> left and right sides". More specifically, the distance between the light emitting elements arranged at the center of the light guide plate LG may be made wider than the distance between the light emitting elements arranged at the end of the light guide plate LG.
2) It is effective to arrange a plurality of diffusion sheets on top of each other and set the diffusion rate of the diffusion sheets to "center of screen <left and right sides". Another measure is to make the diffusion rate in the central part smaller than the diffusion rate on the left and right sides for a single diffusion sheet.
　（第１変形例）　
　図１２は、第１変形例に係る表示装置の一部を示す断面図である。第１変形例は、上記対策構成２）を具体化した一例を示している。　
　図示のように、第１変形例によれば、導光板ＬＧの両側縁部を覆うように第２拡散シート５６Ｂを設けている。拡散シート５６は、第２拡散シート５６Ｂに重ねて配置され、第２拡散シート５６Ｂを覆っている。
　上記構成によれば、導光板ＬＧの側縁から漏れ出る光および導光板ＬＧの側縁部から出射される光を第２拡散シート５６Ｂおよび拡散シート５６により拡散することができ、拡散シート５６、５６Ｂ全体の拡散率を「画面中央部＜左右辺」とすることができる。 (First modification)
FIG. 12 is a cross-sectional view showing a part of the display device according to the first modification. The first modification shows an example embodying the above-mentioned countermeasure configuration 2).
As shown in the figure, according to the first modification, the second diffusion sheet 56B is provided so as to cover both side edges of the light guide plate LG. The diffusion sheet 56 is arranged so as to overlap the second diffusion sheet 56B and covers the second diffusion sheet 56B.
According to the above configuration, the light leaking from the side edge of the light guide plate LG and the light emitted from the side edge of the light guide plate LG can be diffused by the second diffusion sheet 56B and the diffusion sheet 56, and the diffusion sheet 56, The diffusion rate of the entire 56B can be set to "center of screen <left and right sides".
　次に、他の実施形態に係る表示装置について説明する。なお、以下に説明する他の実施形態において、前述した第１実施形態と同一の部分には、同一の参照符号を付してその詳細な説明を省略あるいは簡略化し、第１実施形態と異なる部分を中心に詳しく説明する。
（第２実施形態）
　図１４は、第２実施形態に係る表示デバイスを示す斜視図である。図示のように、表示デバイス１０は、複数、例えば、３つの表示装置４０を並べて配置することにより構成され、表示部は、凹状に湾曲した表示面２０ａを有している。各表示装置４０は、支持フレーム４２と、支持フレーム４２に支持され凹状に湾曲した液晶表示パネル６０とを有している。３つの液晶表示パネル６０の側縁を平行に突き合わせて配列することにより、凹状に湾曲した表示面２０ａを有する表示部を構成している。 Next, the display device according to another embodiment will be described. In addition, in other embodiments described below, the same parts as those in the first embodiment described above are designated by the same reference numerals to omit or simplify the detailed description thereof, and parts different from those in the first embodiment. Will be explained in detail.
(Second Embodiment)
FIG. 14 is a perspective view showing the display device according to the second embodiment. As shown in the drawing, the display device 10 is configured by arranging a plurality of, for example, three display devices 40 side by side, and the display unit has a concavely curved display surface 20a. Each display device 40 has a support frame 42 and a liquid crystal display panel 60 supported by the support frame 42 and curved in a concave shape. By arranging the side edges of the three liquid crystal display panels 60 so as to be parallel to each other, a display unit having a concavely curved display surface 20a is formed.
　図１５は、表示デバイス１０を構成する表示装置の分解斜視図、図１６は、表示装置の斜視図、図１７は図１６の線Ｄ－Ｄに沿った表示装置の横断面図、図１８は、図１６の線Ｃ－Ｃに沿った表示装置の縦断面図である。図において、表示装置の長手方向をＸ方向、長手方向と直交する幅方向をＹ方向と定義している。
　図１５ないし図１８に示すように、表示装置４０は、アルミニウム等の金属で形成された支持フレーム４２と、支持フレーム４２上に載置された平坦なバックライト装置５０と、支持フレーム４２に取付けられバックライト装置５０に隙間をおいて対向する拡散シート５６と、支持フレーム４２に取付けられ拡散シート５６に重ねて配置されたシート状の液晶表示パネル６０と、を備えている。拡散シート５６および液晶表示パネル６０は、バックライト装置５０に対し凹状に湾曲している。 15 is an exploded perspective view of the display device constituting the display device 10, FIG. 16 is a perspective view of the display device, FIG. 17 is a cross-sectional view of the display device along the line DD of FIG. , FIG. 16 is a vertical cross-sectional view of the display device along the line CC of FIG. In the figure, the longitudinal direction of the display device is defined as the X direction, and the width direction orthogonal to the longitudinal direction is defined as the Y direction.
As shown in FIGS. 15 to 18, the display device 40 is attached to a support frame 42 made of a metal such as aluminum, a flat backlight device 50 mounted on the support frame 42, and the support frame 42. It is provided with a diffusion sheet 56 that faces the backlight device 50 with a gap, and a sheet-shaped liquid crystal display panel 60 that is attached to the support frame 42 and arranged so as to overlap the diffusion sheet 56. The diffusion sheet 56 and the liquid crystal display panel 60 are concavely curved with respect to the backlight device 50.
　支持フレーム４２は、平坦な矩形状のベース部４３と、ベース部４３の一方の短辺部から突出した下部フランジ部４４と、ベース部４３の他方の短辺部から下部フランジ部４４と同一方向に突出した上部フランジ部４６と、更に、ベース部４３の左右の側縁から延出した一対の側壁部４５と、を一体に有している。各側壁部４５のＸ方向の両端は、下部フランジ部４４および上部フランジ部４６に連結されている。ベース部４３は、バックライト装置５０を設置するための平坦な矩形状の設置面４３ａを有している。なお、ベース部４３および設置面４３ａは、矩形板状に限らず、中空の矩形枠状に形成してもよい。
　下部フランジ部４４は設置面４３ａに対してほぼ垂直に設けられている。下部フランジ部４４は、設置面４３ａに対して凹状に湾曲した円弧状の第１支持面４４ｄを有している。第１支持面４４ｄは、一方の側壁部４５から他方の側壁部４５まで延在し、一定の幅を有する帯状に形成されている。第１支持面４４ｄのＹ方向の両端部にねじ孔ＳＣ１が設けられている。
　上部フランジ部４６は、設置面４３ａに対してほぼ垂直に設けられている。上部フランジ部４６は、ベース部４３を間に挟んで下部フランジ部４４とほぼ平行に対向している。上部フランジ部４６は、一方の側壁部４５から他方の側壁部４５まで延在する第２支持面４６ａを有している。第２支持面４６ａは、一定の幅を有する帯状に形成されている。第２支持面４６ａは、設置面４３ａに対して凹状に湾曲している。第２支持面４６ａは、第１支持面４４ｄと同一の曲率半径に形成されている。第２支持面４６ａのＹ方向の両端部にねじ孔ＳＣ２が設けられている。 The support frame 42 has a flat rectangular base portion 43, a lower flange portion 44 protruding from one short side portion of the base portion 43, and a lower flange portion 44 from the other short side portion of the base portion 43 in the same direction as the lower flange portion 44. It integrally has an upper flange portion 46 protruding from the base portion 43 and a pair of side wall portions 45 extending from the left and right side edges of the base portion 43. Both ends of each side wall portion 45 in the X direction are connected to the lower flange portion 44 and the upper flange portion 46. The base portion 43 has a flat rectangular installation surface 43a for installing the backlight device 50. The base portion 43 and the installation surface 43a are not limited to the rectangular plate shape, but may be formed into a hollow rectangular frame shape.
The lower flange portion 44 is provided substantially perpendicular to the installation surface 43a. The lower flange portion 44 has an arc-shaped first support surface 44d that is concavely curved with respect to the installation surface 43a. The first support surface 44d extends from one side wall portion 45 to the other side wall portion 45 and is formed in a band shape having a constant width. Screw holes SC1 are provided at both ends of the first support surface 44d in the Y direction.
The upper flange portion 46 is provided substantially perpendicular to the installation surface 43a. The upper flange portion 46 faces the lower flange portion 44 substantially in parallel with the base portion 43 sandwiched between them. The upper flange portion 46 has a second support surface 46a extending from one side wall portion 45 to the other side wall portion 45. The second support surface 46a is formed in a band shape having a constant width. The second support surface 46a is curved in a concave shape with respect to the installation surface 43a. The second support surface 46a is formed to have the same radius of curvature as the first support surface 44d. Screw holes SC2 are provided at both ends of the second support surface 46a in the Y direction.
　バックライト装置５０は、平坦な出射面ＳＡ１を有する矩形板状の導光板ＬＧと、導光板ＬＧの一側面（入射面）に対向して設けられた複数の発光素子（ＬＥＤ）５１と、導光板ＬＧの第１主面（出射面）ＳＡ１に重ねて配置される光学シート（プリズムシートＯＳ１および拡散シートＯＳ２）と、導光板ＬＧの第２主面（背面）に対向して設けられる図示しない反射シートと、これらを支持する図示しないフレームと、を有している。ＬＥＤ５１は回路基板５２に実装され、この回路基板５２は導光板ＬＧおよびフレームに固定されている。
　バックライト装置５０は、導光板ＬＧの第２主面が設置面４３ａに対向した状態で、設置面４３ａ上に載置されている。バックライト装置５０は、両面テープあるいは接着剤により設置面４３ａに貼付され、導光板ＬＧおよび光学シート０Ｓ１、Ｓ２は、設置面４３ａと平行に対向して配置されている。 The backlight device 50 includes a rectangular plate-shaped light guide plate LG having a flat emission surface SA1, a plurality of light emitting elements (LEDs) 51 provided facing one side surface (incident surface) of the light guide plate LG, and a guide. An optical sheet (prism sheet OS1 and diffusion sheet OS2) arranged so as to overlap the first main surface (exit surface) SA1 of the light plate LG and a second main surface (back surface) of the light guide plate LG are not shown. It has a reflective sheet and a frame (not shown) that supports them. The LED 51 is mounted on the circuit board 52, and the circuit board 52 is fixed to the light guide plate LG and the frame.
The backlight device 50 is mounted on the installation surface 43a with the second main surface of the light guide plate LG facing the installation surface 43a. The backlight device 50 is attached to the installation surface 43a with double-sided tape or an adhesive, and the light guide plate LG and the optical sheets 0S1 and S2 are arranged so as to face parallel to the installation surface 43a.
　拡散シート５６は、ほぼ矩形状に形成され、湾曲した状態で支持フレーム４２に取付けられバックライト装置５０と対向している。拡散シート５６のＸ方向に対向する上下一対の第１側縁部５５ａ、５５ｂは、支持フレーム４２の第１支持面４４ｄおよび第２支持面４６ａに当接し、第１支持面４４ｄおよび第２支持面４６ａに沿って湾曲している。これにより、拡散シート５６全体は、支持フレーム４２の設置面４３ａに対して凹状に湾曲し、バックライト装置５０に隙間を置いて対向している。各第１側縁部５５ａ、５５ｂのＹ方向の両端部に、それぞれ支持フレーム４２のねじ孔ＳＣ１、ＳＣ２に対向する透孔５７が設けられている。
　拡散シート５６のＹ方向に対向する左右一対の第２側縁部５６ａ、５６ｂは、側壁部４５を越えて延出し、側壁部４５の外面側に折り返されている。一対の第２側縁部５６ａ、５６ｂは、一対の側壁部４５の延出端を覆っている。第２側縁部５６ａ、５６ｂは、それぞれ側壁部４５の外面に貼付されている。 The diffusion sheet 56 is formed in a substantially rectangular shape, is attached to the support frame 42 in a curved state, and faces the backlight device 50. The pair of upper and lower first side edge portions 55a and 55b of the diffusion sheet 56 facing in the X direction abut on the first support surface 44d and the second support surface 46a of the support frame 42, and the first support surface 44d and the second support surface 44d and the second support surface 46a. It is curved along the surface 46a. As a result, the entire diffusion sheet 56 is concavely curved with respect to the installation surface 43a of the support frame 42, and faces the backlight device 50 with a gap. Through holes 57 facing the screw holes SC1 and SC2 of the support frame 42 are provided at both ends of the first side edge portions 55a and 55b in the Y direction, respectively.
The pair of left and right second side edge portions 56a and 56b of the diffusion sheet 56 facing in the Y direction extend beyond the side wall portion 45 and are folded back to the outer surface side of the side wall portion 45. The pair of second side edge portions 56a, 56b covers the extending ends of the pair of side wall portions 45. The second side edge portions 56a and 56b are attached to the outer surface of the side wall portion 45, respectively.
　液晶表示パネル６０は、前述した第１実施形態における液晶表示パネル６０とほぼ同一の構成を有している。液晶表示パネル６０は、拡散シート５６に重ねて配置され、拡散シート５６に沿って凹状に湾曲している。液晶表示パネル６０の第１基板ＳＵＢ１は、Ｘ方向に対向する上下一対の第１パネル側縁部６１ａ、６１ｂは、第２基板ＳＵＢ２の上下の側縁からＸ方向に突出している。第１パネル側縁部６１ａ、６１ｂのＹ方向の両端部に、それぞれ支持フレーム４２のねじ孔ＳＣ１、ＳＣ２に対向する透孔６２が設けられている。上下一対の第１パネル側縁部６１ａ、６１ｂは、拡散シート５６を介して支持フレーム４２の第１支持面４４ｄおよび第２支持面４６ａに当接し、第１支持面４４ｄおよび第２支持面４６ａに沿って湾曲している。これにより、液晶表示パネル６０全体は、支持フレーム４２の設置面４３ａに対して凸状に湾曲した状態に支持され、液晶表示パネル６０の表示領域ＤＡおよび表示面１２ａは、拡散シート５６の全面に対向している。　
　液晶表示パネル６０のＹ方向に対向する左右一対の第２パネル側縁部６４ａ、６４ｂは
支持フレーム４２の側壁部４５を越えて延出し、表示領域ＤＡの境界に沿って側壁部４５の外面側に折り曲げられている。折り曲げられた一対の第２パネル側縁部６４ａ、６４ｂは、側壁部４５の外面あるいは拡散シート５６の第２側縁部５６ａ、５６ｂに貼付される。 The liquid crystal display panel 60 has substantially the same configuration as the liquid crystal display panel 60 in the first embodiment described above. The liquid crystal display panel 60 is arranged so as to be overlapped with the diffusion sheet 56, and is curved in a concave shape along the diffusion sheet 56. The first substrate SUB1 of the liquid crystal display panel 60 has a pair of upper and lower first panel side edges 61a and 61b facing each other in the X direction, and the upper and lower side edges 61a and 61b project in the X direction from the upper and lower side edges of the second substrate SUB2. Through holes 62 facing the screw holes SC1 and SC2 of the support frame 42 are provided at both ends of the side edge portions 61a and 61b of the first panel in the Y direction, respectively. The pair of upper and lower first panel side edges 61a and 61b abut on the first support surface 44d and the second support surface 46a of the support frame 42 via the diffusion sheet 56, and the first support surface 44d and the second support surface 46a. It is curved along. As a result, the entire liquid crystal display panel 60 is supported in a state of being convexly curved with respect to the installation surface 43a of the support frame 42, and the display area DA and the display surface 12a of the liquid crystal display panel 60 cover the entire surface of the diffusion sheet 56. Facing each other.
A pair of left and right second panel side edge portions 64a and 64b of the liquid crystal display panel 60 facing in the Y direction extend beyond the side wall portion 45 of the support frame 42, and extend along the boundary of the display area DA on the outer surface side of the side wall portion 45. It is folded into. The pair of bent second panel side edge portions 64a and 64b are attached to the outer surface of the side wall portion 45 or the second side edge portions 56a and 56b of the diffusion sheet 56.
　支持フレーム４２は一対の押え板７０ａ、７０ｂを含んでいる。押え板７０ａ、７０ｂは、帯状に形成され、かつ、支持フレーム４２の第１支持面４４ｄおよび第２支持面４６ａに対応する幅および長さをそれぞれ有している。押え板７０ａ、７０ｂは、それぞれ第１支持面４４ｄおよび第２支持面４６ａとほぼ同一の曲率で湾曲している。
　一方の押さえ板７０ａは、液晶表示パネル６０の第１パネル側縁部６１ａに重ねて配置され、一対の固定ねじにより、第１支持面４４ｄにねじ止め固定されている。各固定ねじは、押さえ板７０ａ、第１パネル側縁部の透孔６２、拡散シート５６の透孔５７を通して、支持フレーム４２のねじ孔ＳＣ１にねじ込まれる。液晶表示パネル６０の第１パネル側縁部６１ａおよび拡散シート５６の第１側縁部５５ａは、押さえ板７０ａにより第１支持面４４ｄに押付けられ、凹状に湾曲した状態に保持されている。 The support frame 42 includes a pair of holding plates 70a and 70b. The pressing plates 70a and 70b are formed in a strip shape, and have a width and a length corresponding to the first support surface 44d and the second support surface 46a of the support frame 42, respectively. The pressing plates 70a and 70b are curved with substantially the same curvature as the first support surface 44d and the second support surface 46a, respectively.
One holding plate 70a is arranged so as to be overlapped with the first panel side edge portion 61a of the liquid crystal display panel 60, and is screwed and fixed to the first support surface 44d by a pair of fixing screws. Each fixing screw is screwed into the screw hole SC1 of the support frame 42 through the holding plate 70a, the through hole 62 at the side edge of the first panel, and the through hole 57 of the diffusion sheet 56. The first panel side edge portion 61a of the liquid crystal display panel 60 and the first side edge portion 55a of the diffusion sheet 56 are pressed against the first support surface 44d by the pressing plate 70a and are held in a concavely curved state.
　他方の押さえ板７０ｂは、液晶表示パネル６０の第１パネル側縁部６１ｂに重ねて配置され、一対の固定ねじにより、第２支持面４６ａにねじ止め固定されている。各固定ねじは、押さえ板７０ｂ、第１パネル側縁部６１ｂの透孔６２、拡散シート５６の透孔５７を通して、支持フレーム４２のねじ孔ＳＣ２にねじ込まれる。液晶表示パネル６０の第１パネル側縁部６１ｂおよび拡散シート５６の第１側縁部５５ｂは、押さえ板７０ｂにより第２支持面４６ａに押付けられ、凹状に湾曲した状態に保持されている。
　これにより、液晶表示パネル６０および拡散シート５６は、バックライト装置５０に対して凹状に湾曲した状態で支持フレーム４２に取付けられている。 The other holding plate 70b is arranged so as to overlap the first panel side edge portion 61b of the liquid crystal display panel 60, and is screwed and fixed to the second support surface 46a by a pair of fixing screws. Each fixing screw is screwed into the screw hole SC2 of the support frame 42 through the through hole 62 of the holding plate 70b, the side edge portion 61b of the first panel, and the through hole 57 of the diffusion sheet 56. The first panel side edge 61b of the liquid crystal display panel 60 and the first side edge 55b of the diffusion sheet 56 are pressed against the second support surface 46a by the pressing plate 70b and are held in a concavely curved state.
As a result, the liquid crystal display panel 60 and the diffusion sheet 56 are attached to the support frame 42 in a concavely curved state with respect to the backlight device 50.
　上記のように構成された３つの表示装置４０は、図１４に示したように、表示面２０ａの側縁を隣の表示面２０ａの側縁と平行に突き合わせた状態に配列され、ほぼ隙間なく連続した凹曲面状の表示面を有する表示デバイスを構成している。 As shown in FIG. 14, the three display devices 40 configured as described above are arranged in a state where the side edges of the display surface 20a are butted parallel to the side edges of the adjacent display surface 20a, and there is almost no gap. It constitutes a display device having a continuous concave curved display surface.
　以上のように構成された第２実施形態に係る表示デバイス１０によれば、表示装置４０は、平坦な導光板ＬＧを有する平面型のバックライト装置５０と凹状に湾曲した拡散シート５６および液晶表示パネル６０を備えている。このように、平面型のバックライト装置を用いることにより、光源（ＬＥＤ）の均等配置が容易で、輝度分布などの表示品位を維持しやすい。平坦な導光板の製造コストは湾曲した導光板の製造コストに比較して安価であることから、表示装置全体の製造コストを通常の平面表示装置と同等程度に抑えることができる。従って、第２実施形態によれば、湾曲した表示面を有し、製造コストの低減を図ることが可能な表示装置が得られる。 According to the display device 10 according to the second embodiment configured as described above, the display device 40 includes a flat backlight device 50 having a flat light guide plate LG, a diffusion sheet 56 curved in a concave shape, and a liquid crystal display. It has a panel 60. As described above, by using the flat backlight device, it is easy to evenly arrange the light sources (LEDs), and it is easy to maintain the display quality such as the brightness distribution. Since the manufacturing cost of the flat light guide plate is lower than the manufacturing cost of the curved light guide plate, the manufacturing cost of the entire display device can be suppressed to the same level as that of a normal flat display device. Therefore, according to the second embodiment, it is possible to obtain a display device having a curved display surface and capable of reducing the manufacturing cost.
　本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。新規な実施形態および変形例は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。実施形態やその変形例は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. The new embodiments and modifications can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The embodiments and variations thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalent scope thereof.
　本発明の実施形態として上述した各構成を基にして、当業者が適宜設計変更して実施し得る全ての構成も、本発明の要旨を包含する限り、本発明の範囲に属する。例えば、表示デバイスを構成する表示装置は、３つあるいは４つに限定されることなく、必要に応じて増減可能である。表示装置の支持体は、上述した支持フレームに限定されることなく、拡散シートおよび液晶表示パネルを湾曲した状態に支持できる形状および構造を有する支持体であればよい。支持体の支持面は、連続した支持面に限らず、間欠的に設けられた支持面としてもよい。表示装置の構成部材の材料は、上述した例に限らず、種々選択可能である。 All configurations that can be implemented by those skilled in the art with appropriate design changes based on the configurations described above as embodiments of the present invention also belong to the scope of the present invention as long as the gist of the present invention is included. For example, the number of display devices constituting the display device is not limited to three or four, and can be increased or decreased as needed. The support of the display device is not limited to the support frame described above, and may be any support having a shape and structure capable of supporting the diffusion sheet and the liquid crystal display panel in a curved state. The support surface of the support is not limited to the continuous support surface, but may be an intermittently provided support surface. The material of the constituent members of the display device is not limited to the above-mentioned example, and various materials can be selected.

Claims (8)

  1. 　支持体と、
    　平坦な出射面を有し前記支持体に支持された導光板と、前記導光板に光を入射する光源と、を有するバックライト装置と、
    　前記支持体に湾曲した状態で支持され前記導光板の出射面に対向する拡散シートと、
    　前記拡散シートに対向して配置され、前記支持体に湾曲した状態で支持される液晶表示パネルと、
    　を備える表示装置。     With the support
    A backlight device having a light guide plate having a flat emitting surface and being supported by the support, and a light source for incident light on the light guide plate.
    A diffusion sheet that is supported by the support in a curved state and faces the exit surface of the light guide plate.
    A liquid crystal display panel that is arranged to face the diffusion sheet and is supported in a curved state on the support.
    A display device comprising.
  2. 　前記支持体は、前記バックライト装置が載置された設置面を有するベース部と、前記ベース部から同一方向に突出し前記設置面を挟んで互いに対向して設けられ第１フランジ部および第２フランジ部と、を備え、
    　前記第１フランジ部および第２フランジ部は、それぞれ前記設置面に対して湾曲した第１支持面および第２支持面を有し、
    　前記拡散シートは、それぞれ前記第１支持面および第２支持面に当接し前記第１支持面および第２支持面に沿って湾曲した一対の第１側縁部を有し、
    　前記液晶表示パネルは、それぞれ前記拡散シートの前記一対の第1側縁部に重ねて配置され前記第１支持面および第２支持面に沿って湾曲した一対の第１パネル側縁部を有している請求項１に記載の表示装置。     The support has a base portion having an installation surface on which the backlight device is mounted, and a first flange portion and a second flange portion that project in the same direction from the base portion and are provided so as to face each other with the installation surface interposed therebetween. With a part,
    The first flange portion and the second flange portion have a first support surface and a second support surface that are curved with respect to the installation surface, respectively.
    The diffusion sheet has a pair of first side edges that are in contact with the first support surface and the second support surface and are curved along the first support surface and the second support surface, respectively.
    Each of the liquid crystal display panels has a pair of first panel side edges that are arranged so as to overlap the pair of first side edges of the diffusion sheet and are curved along the first support surface and the second support surface. The display device according to claim 1.
  3. 　前記第１支持面、前記第２支持面、前記拡散シート、および前記液晶表示パネルは、前記設置面に対して凸状に湾曲している請求項２に記載の表示装置。 The display device according to claim 2, wherein the first support surface, the second support surface, the diffusion sheet, and the liquid crystal display panel are curved in a convex shape with respect to the installation surface.
  4. 　前記拡散シートは、それぞれ前記第１側縁部と交差する方向に延在する一対の第２側縁部を有し、前記一対の第２側縁部は、前記導光板の側縁を越えて外側に延出し、前記ベース部の背面側に折り曲げられ、前記導光板の前記側縁を覆っている請求項３に記載の表示装置。 Each of the diffusion sheets has a pair of second side edges extending in a direction intersecting the first side edges, and the pair of second side edges extend beyond the side edges of the light guide plate. The display device according to claim 3, wherein the display device extends outward, is bent toward the back surface side of the base portion, and covers the side edge of the light guide plate.
  5. 　前記液晶表示パネルは、それぞれ前記第１パネル側縁部と交差する方向に延在する一対の第２パネル側縁部を有し、前記一対の第２パネル側縁部は、前記導光板の側縁を越えて外側に延出し、前記ベース部の背面側に折り曲げられている請求項４に記載の表示装置。 Each of the liquid crystal display panels has a pair of second panel side edges extending in a direction intersecting the first panel side edges, and the pair of second panel side edges are on the side of the light guide plate. The display device according to claim 4, wherein the display device extends outward beyond the edge and is bent toward the back surface side of the base portion.
  6. 　前記第１支持面、前記第２支持面、前記拡散シート、および前記液晶表示パネルは、前記設置面に対して凹状に湾曲している請求項２に記載の表示装置。 The display device according to claim 2, wherein the first support surface, the second support surface, the diffusion sheet, and the liquid crystal display panel are concavely curved with respect to the installation surface.
  7. 　前記支持体は、前記拡散シートの第１側縁部および前記液晶表示パネルの第１パネル側縁部に重ねて前記第１支持面に固定され前記第１側縁部および前記第１パネル側縁部を湾曲状態に保持する第１押え部材と、前記拡散シートの第１側縁部および前記液晶表示パネルの第１パネル側縁部に重ねて前記第２支持面に固定され前記第１側縁部および前記第１パネル側縁部を湾曲状態に保持する第２押え部材と、を含んでいる請求項６に記載の表示装置。 The support is overlapped with the first side edge portion of the diffusion sheet and the first panel side edge portion of the liquid crystal display panel and fixed to the first support surface, and the first side edge portion and the first panel side edge portion. The first holding member that holds the portion in a curved state, the first side edge portion of the diffusion sheet, and the first panel side edge portion of the liquid crystal display panel are overlapped and fixed to the second support surface, and the first side edge portion is fixed. The display device according to claim 6, further comprising a portion and a second pressing member that holds the side edge portion of the first panel in a curved state.
  8. 　それぞれ湾曲した表示面し、前記表示面が連続して並ぶように配列された複数の表示装置を備えた表示デバイスであって、
    　前記表示装置の各々は、
    　支持体と、
    　平坦な出射面を有し前記支持体に支持された導光板と、前記導光板に光を入射する光源と、を有するバックライト装置と、
    　前記支持体に支持され前記導光板の出射面に対向する湾曲した拡散シートと、
    　前記拡散シートに対向して前記支持体に支持され、前記拡散シートに沿って湾曲した前記表示面を有する液晶表示パネルと、を備えている、
    　表示デバイス。     A display device including a plurality of display devices each having a curved display surface and arranged so that the display surfaces are continuously arranged.
    Each of the display devices
    With the support
    A backlight device having a light guide plate having a flat emitting surface and being supported by the support, and a light source for incident light on the light guide plate.
    A curved diffusion sheet supported by the support and facing the exit surface of the light guide plate, and
    A liquid crystal display panel having a display surface that is supported by the support and curved along the diffusion sheet so as to face the diffusion sheet.
    Display device.
PCT/JP2020/017995 2019-06-27 2020-04-27 Display apparatus WO2020261750A1 (en)

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