WO2012137762A1 - Dispositif d'affichage et appareil électronique muni du dispositif d'affichage - Google Patents

Dispositif d'affichage et appareil électronique muni du dispositif d'affichage Download PDF

Info

Publication number
WO2012137762A1
WO2012137762A1 PCT/JP2012/059042 JP2012059042W WO2012137762A1 WO 2012137762 A1 WO2012137762 A1 WO 2012137762A1 JP 2012059042 W JP2012059042 W JP 2012059042W WO 2012137762 A1 WO2012137762 A1 WO 2012137762A1
Authority
WO
WIPO (PCT)
Prior art keywords
light guide
liquid crystal
light
display device
guide element
Prior art date
Application number
PCT/JP2012/059042
Other languages
English (en)
Japanese (ja)
Inventor
寿史 渡辺
Original Assignee
シャープ株式会社
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 シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2012137762A1 publication Critical patent/WO2012137762A1/fr

Links

Images

Classifications

    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • 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
    • G02F1/13336—Combining plural substrates to produce large-area displays, e.g. tiled displays

Definitions

  • the present invention relates to a display device capable of reducing a decrease in transmittance of a light guide element, and an electronic apparatus including the display device.
  • the display panel has a display area composed of a plurality of pixels and a frame area formed outside the display area.
  • the frame region is provided with a seal portion for sealing and holding a display medium (electro-optical element) such as a liquid crystal material, a drive circuit mounting portion for driving the pixels, and the like, and does not contribute to display. .
  • Patent Document 1 discloses a liquid crystal display device that has an optical fiber face plate that covers the entire surface of the display panel and guides part of light emitted from the display area to the frame area by the optical fiber face plate.
  • Patent Document 2 discloses a display unit and a composite type in which an optical fiber face plate composite is provided on the entire surface of the display panel, and the light emitted from the display area is enlarged and displayed on the outer size of the display panel by the optical fiber face plate.
  • a display is disclosed.
  • Patent Document 3 has light compensation means comprising a large number of inclined thin films and a transparent body filled between the inclined thin films over almost the entire surface of the display panel.
  • a display device is disclosed in which the light is guided to the frame region by light compensation means.
  • Patent Document 4 discloses a display device in which a diffusion member including a large number of optical fibers is disposed only in a region near the frame region, and light emitted from the display region is guided to the frame region by the optical fiber. Is disclosed. By the techniques disclosed in these patent documents 1 to 4, seamless display can be realized.
  • Japanese Patent Publication Japanese Patent Laid-Open No. 7-128652 (published May 19, 1995)” Japanese Patent Publication “Japanese Patent Laid-Open No. 2000-56713 (published on February 25, 2000)” Japanese Patent Publication “Japanese Patent Laid-Open No. 2001-5414 (published on January 12, 2001)” US Pat. No. 5,129,028 (registered July 7, 1992)
  • the light guide element generally includes a metal layer and a transmission layer, and light incident on the metal layer is guided while being reflected many times in the metal layer.
  • the loss greatly affects the transmittance of the light guide element.
  • FIG. 16 is a cross-sectional view schematically showing a configuration of a main part of a liquid crystal display device including a conventional light guide element.
  • the light guide element 300 ′ has a plurality of light guide portions, and each light guide portion includes a metal layer and a transmission layer.
  • the light guide element 300 ′ has a structure in which each light guide is inclined with respect to the light incident surface 301 and the light emitting surface 302.
  • the light incident perpendicularly to the incident surface 301 of the light guide element 300 ' is emitted from the emission surface 302 by repeating reflection in the light guide (arrow R in the figure).
  • the light guide element 300 ′ has an inclination angle ⁇ of 45 degrees, a stacking pitch p of the light guide parts of 0.1 mm, and a thickness d of the light guide element 300 ′ of 1 mm.
  • the transmittance T of the light guide per thickness d is 100% and the reflectance R of the metal layer is 98% (silver)
  • the transmittance of the light guide element 300 ′ is approximately 67%. Become.
  • the transmittance T is 100% and the reflectance R of the metal layer is 90% (aluminum layer)
  • the transmittance of the light guide element 300 ′ is approximately 13%, and there is a large difference in the transmittance. Arise.
  • the loss of light amount due to the light reflection in the metal layer of the light guide portion leads to a large decrease in the transmittance of the light guide element 300 '. If the transmittance of the light guide element 300 ′ is low, it is necessary to compensate for a decrease in the luminance of the liquid crystal display device 100 ′ by increasing the luminance of the backlight device 400. As a result, there is a problem that the power consumption of the liquid crystal display device 100 ′ increases.
  • an object of the present invention is to provide a display device capable of reducing a decrease in transmittance of a light guide element, and an electronic apparatus including the display device. There is.
  • a display device is a display device including a display panel and a light guide element provided on a display surface side of the display panel in order to solve the above problem.
  • the light guide element is configured by repeatedly laminating a reflective layer made of metal and a translucent layer in parallel with each other, and includes a polarizing plate on the display surface side of the display panel, and the reflective layer and the translucent layer.
  • the direction in which the boundary surface with the optical layer extends in the plane direction of the display surface and the direction of the light transmission axis of the polarizing plate are parallel to each other.
  • the boundary surface between the light transmissive layer and the reflective layer is aligned with the direction in which the surface of the display surface extends and the direction of the light transmission axis of the polarizing plate. Since S-polarized light is incident, it is possible to suppress a decrease in reflectance in the reflective layer. That is, a decrease in the reflectance in the reflective layer is suppressed, and the light utilization efficiency can be increased. As a result, the transmittance of the light guide element is improved. Therefore, since the transmittance of the light guide element is low, it is not necessary to compensate for the decrease in luminance of the display device by increasing the luminance of the backlight, thereby eliminating the problem of increasing the power consumption of the display device. be able to.
  • an electronic device includes a plurality of any of the display devices described above, and the plurality of display devices are arranged side by side on the same plane. It is characterized by that.
  • the direction in which the boundary surface between the light-transmitting layer and the reflective layer extends in the surface direction of the display surface matches the direction of the light transmission axis of the polarizing plate, Since S-polarized light is incident on the light guide element, it is possible to suppress a decrease in reflectance in the reflective layer. That is, a decrease in the reflectance in the reflective layer is suppressed, and the light utilization efficiency can be increased. As a result, the transmittance of the light guide element is improved. Therefore, since the transmittance of the light guide element is low, it is not necessary to compensate for the decrease in luminance of the display device by increasing the luminance of the backlight, thereby eliminating the problem of increasing the power consumption of the display device. be able to.
  • (A) in a figure is a top view which shows the liquid crystal display device which concerns on one Embodiment of this invention
  • (b) in a figure is a boundary surface in the liquid crystal display device shown in (a) in the figure It is sectional drawing which shows an inclination direction.
  • (A) in a figure is a top view which shows the liquid crystal display device which concerns on one Embodiment of this invention
  • (b) in a figure is a boundary surface in the liquid crystal display device shown in (a) in the figure It is sectional drawing which shows an inclination direction.
  • (A) to (c) in the figure are schematic configuration diagrams showing an example of an external appearance of an electronic apparatus according to an embodiment of the present invention.
  • (A) in a figure is a top view which shows schematic structure of the principal part of the liquid crystal display device based on one Embodiment of this invention
  • (b) in a figure is the liquid crystal shown to (a) in a figure It is AA arrow directional cross-sectional view of a display apparatus.
  • (A) in a figure is the inclination direction of the boundary line of the light guide parts adjacent in the output surface of each light guide element, when the liquid crystal display device which concerns on one Embodiment of this invention is arrange
  • Is a plan view showing the relationship between the image displayed on each liquid crystal panel when the light guide element and the light guide element are line-symmetric, the image actually visible through the light guide element, and the boundary surface of the light guide unit (B) in the figure is a cross-sectional view showing the inclination direction of the boundary surface of the light guide section in the liquid crystal display device shown in (a) in the figure.
  • (A)-(c) in the figure is a diagram showing a method of manufacturing a light guide element using the sheet laminate shown in FIG.
  • (A) in a figure is a top view which shows the liquid crystal display device which concerns on one Embodiment of this invention
  • (b) in a figure is a boundary surface in the liquid crystal display device shown in (a) in the figure It is sectional drawing which shows an inclination direction.
  • (A) in a figure is a top view which shows the liquid crystal display device which concerns on one Embodiment of this invention
  • (b) in a figure is a boundary surface in the liquid crystal display device shown in (a) in the figure It is sectional drawing which shows an inclination direction. It is sectional drawing which shows schematically the structure of the principal part of a liquid crystal display device provided with the conventional light guide element.
  • Examples of electronic devices provided with the display device according to this embodiment include various electronic devices having a display unit such as a mobile phone, an electronic book, a game machine, a TV (television), or a public bulletin board for outdoor use. Can be mentioned.
  • a display unit such as a mobile phone, an electronic book, a game machine, and a mobile phone will be described as an example of an electronic device including the display device according to this embodiment, but this embodiment is not limited thereto. It is not something.
  • a liquid crystal display device will be described as an example of the display device according to the present embodiment, but the present embodiment is not limited to this.
  • FIGS. 3A to 3C are schematic configuration diagrams showing an example of the external appearance of an electronic apparatus provided with the display device according to the present embodiment.
  • the electronic devices shown in FIGS. 3A to 3C are foldable devices having two display portions. Examples of such an electronic device 1 include an electronic book, a game machine, and a mobile phone as described above, but the present embodiment is not limited to this.
  • the electronic apparatus 1 includes two liquid crystal display devices 100A and 100B provided adjacent to each other as a first display unit and a second display unit. I have.
  • the electronic device 1 is a tiling type device in which two liquid crystal display devices 100A and 100B are arranged (tiled) in a tile shape. In this way, a large screen can be displayed by tiling a plurality of liquid crystal display devices. Tiling can be performed by a known method. Further, in the following description, the case where the electronic apparatus 1 includes two liquid crystal display devices 100A and 100B will be described as an example. However, the number of liquid crystal display devices is not particularly limited, and one or There may be three or more.
  • the liquid crystal display device 100A includes a liquid crystal panel 200A (display panel) and a light guide element 300A provided on the liquid crystal panel 200A.
  • the liquid crystal display device 100B includes a liquid crystal panel 200B (display panel) and a light guide element 300B provided on the liquid crystal panel 200B.
  • the light guide element 300A may be provided on the entire display surface of the liquid crystal panel 200A. As shown by the two-dot chain lines in FIGS. 3A to 3C, one of the adjacent liquid crystal panels 200A and 200B is provided. It may be provided only in the part.
  • the light guide element 300B may be provided on the entire display surface of the liquid crystal panel 200B, and as shown by two-dot chain lines in FIGS. 3A to 3C, adjacent liquid crystal panels 200A. It may be provided only in a part of 200B.
  • the liquid crystal panels 200A and 200B may be provided so that the ends thereof are close to each other, or may be provided in contact with each other.
  • the liquid crystal display devices 100A and 100B are rotatably connected by a movable mechanism such as a hinge 2, for example. Thereby, in the electronic device 1, it can fold in the boundary part 3 of each liquid crystal display device 100A * 100B, and can change the relative angle of the display surface of these liquid crystal display devices 100A * 100B. .
  • a movable mechanism is an example, and may be omitted, and the angle formed by the two display surfaces may be fixed.
  • the configurations of the liquid crystal panels 200A and 200B and the light guide elements 300A and 300B will be described later.
  • FIG. 4 is a plan view showing a schematic configuration of a main part of the liquid crystal display device 100A according to the present embodiment, and (b) in FIG. 4 is shown in (a) in FIG. FIG. 6 is a cross-sectional view taken along line AA of the liquid crystal display device 100A.
  • the configuration of the liquid crystal display devices 100A and 100B will be described using the liquid crystal display device 100A as an example.
  • the liquid crystal display device 100A is a direct-view type display device, and includes a liquid crystal panel 200A and a light guide element 300A stacked on the liquid crystal panel 200A, as shown in FIG.
  • the liquid crystal display device 100A is a transmissive liquid crystal display device, and a backlight 400A is provided on the back side of the liquid crystal display device 100A.
  • the liquid crystal display device 100A performs display by modulating light emitted from the backlight 400A in the liquid crystal panel 200A.
  • liquid crystal panel 200A Various known liquid crystal panels can be used as the liquid crystal panel 200A.
  • An example of the liquid crystal panel 200A is, for example, a TFT type VA mode liquid crystal panel, but is not limited thereto.
  • the liquid crystal panel 200A has a configuration in which a liquid crystal layer 230 is provided as an electro-optical element between the array substrate 210 and the counter substrate 220.
  • the array substrate 210 has a configuration in which a switching element such as a thin film transistor (TFT) and a pixel electrode 212 are formed on an insulating substrate 211 such as glass.
  • optical film portions 240 and 250 including a polarizing plate and a retardation plate are respectively provided on the surfaces of the array substrate 210 and the counter substrate 220 opposite to the liquid crystal layer 230 as necessary.
  • the liquid crystal panel 200A includes a display area 202 and a frame area 203 (non-display area) formed on the periphery of the liquid crystal panel that is outside the display area 202. ).
  • a plurality of pixels 201 are arranged in a matrix along the x-axis direction and the y-axis direction that are parallel to the display surface and orthogonal to each other.
  • the pixels 201 are arranged at an equal pitch in each of the x-axis direction and the y-axis direction.
  • the horizontal direction of the display surface of liquid crystal panel 200A is the x-axis direction
  • the vertical direction of the display surface of liquid crystal panel 200A is the y-axis direction.
  • the color filter layer 222 is formed corresponding to each pixel 201.
  • the color filter layer 222 of each color of RGB (R: red, G: green, B: blue) is used as the color filter layer 222 as shown in FIG.
  • the case where it is provided along the y-axis direction of the panel 200A will be described as an example.
  • the present embodiment is not limited to this.
  • the type of the color filter layer 222 is not limited to three types of RGB, and a plurality of types are arbitrarily selected from RGBYCM (R: red, G: green, B: blue, Y: yellow, C: cyan, M: magenta). It may be a thing.
  • the light guide element 300 ⁇ / b> A has a plurality of light guide portions 310.
  • Each light guide unit 310 includes a light transmitting layer as a light transmitting unit, and includes a metal layer (reflection layer) as a reflecting unit.
  • the light transmitting part and the reflecting part are stacked in parallel with each other. Therefore, in other words, the light guide unit 310A is configured by repeatedly stacking the light transmitting unit and the reflecting unit in parallel with each other.
  • the light incident from the incident surface 301 of the light guide element 300 ⁇ / b> A propagates through the light transmitting portion and is emitted from the emission surface 302. At this time, the light incident on the light transmitting part propagates in the light transmitting part while being reflected by the reflecting part provided between the light transmitting parts. For this reason, a translucent layer functions as a light guide path (light guide layer). Note that the reflection part of the light guide element 300A does not need to be provided on the entire boundary surface of the light transmission part, and is provided so that light incident on the light transmission part can be reflected and propagated by the reflection part. It only has to be.
  • the light guide unit 310 includes a light-transmitting layer as described above, and is provided in parallel to each other in the thickness direction. Therefore, the boundary surface 303 (layer surface, contact surface) of each light guide unit 310 with another light guide unit 310 is provided in parallel with each other. Further, the boundary surfaces (layer surfaces, contact surfaces) of the layers constituting each light guide unit 310 are also provided in parallel to each other.
  • the light guide element 300A has a structure in which a boundary surface 303 is inclined with respect to an incident surface 301 on which light emitted from the liquid crystal panel 200A is incident and an output surface 302 that emits the light. .
  • the incident surface 311 of at least a part of the light guide unit 310 among the plurality of light guide units 310 overlaps a part of the display area 202 of the liquid crystal panel 200A, and the emission surface 312 of the light guide unit 310 is formed.
  • the liquid crystal panel 200 ⁇ / b> A is disposed so as to overlap at least a part of the frame region 203.
  • the inclination angle of the boundary surface 303 in other words, the inclination angle of the boundary surface (layer surface) of each layer constituting the light guide unit 310 is set to an angle that results in the above arrangement.
  • the light guide element 300A is stacked on the liquid crystal panel 200A so that the incident surface 301 and the display surface of the liquid crystal panel 200A are in close contact with each other.
  • the light guide element 300A and the liquid crystal panel 200A may be bonded together via a light-transmitting adhesive (not shown). By doing so, there is an effect that the light guide element 300A can be prevented from being displaced and the light reflection at the interface between the light guide element 300A is reduced and light can be efficiently incident on the light guide element.
  • the light guide element 300A used in the present embodiment has a flat plate shape as shown in FIG.
  • the incident surface 301 and the emission surface 302 of the light guide element 300A are provided in parallel to the display surface of the liquid crystal panel 200A. Therefore, the light guide part 310 of the light guide element 300A is formed so as to extend obliquely from the normal line direction rather than the normal line direction with respect to the display surface of the liquid crystal panel 200A.
  • the light that has entered the light guide element 300A from one end face of each light-transmitting part is reflected by the reflecting part, propagates through the light-transmitting part, and is emitted from the other end face of the light-transmitting part.
  • a part of the light emitted from the display area 202 of the liquid crystal panel 200A by the light guide part 310 provided so as to be inclined with respect to the display surface of the liquid crystal panel 200A in this way is placed on the frame area 203. Lead. Accordingly, when the liquid crystal display device 100A is viewed from above the light guide element 300A, an image can be visually recognized in the areas on the display area 202 and the frame area 203 of the liquid crystal panel 200A.
  • FIG. (A) and (b) in FIG. 5 are the boundaries between the light guide portions 310 adjacent to each other on the emission surface 302 of each light guide element 300A / 300B when the liquid crystal display devices 100A / 100B are arranged adjacent to each other in the horizontal direction.
  • the line tilt direction (in other words, the line tilt direction formed by the boundary surface 303 in plan view) is symmetrical with respect to the light guide element 300A and the light guide element 300B.
  • FIG. 5A is a plan view showing the relationship between the images displayed on the liquid crystal panels 200A and 200B at this time and the images actually visible through the light guide elements 300A and 300B.
  • (B) in FIG. 5 is a cross-sectional view showing the inclination direction of the boundary surface 303 in the liquid crystal display device 100A shown in (a) in FIG.
  • the inclination direction of the boundary surface 303 of each of the light guide elements 300A and 300B in the plan view is the boundary portion 3 of the liquid crystal display devices 100A and 100B (that is, The light guide elements 300A and 300B are arranged so as to be line-symmetric with respect to the boundary 3) of the two screens.
  • FIG. 5B in order to display an image in the frame region 203 adjacent to the liquid crystal display device 100A / 100B with the boundary portion 3 therebetween, in the cross section of each light guide element 300A / 300B.
  • the boundary surface 303 is provided to be inclined toward the boundary portion 3 so as to be line symmetric at the boundary portion 3.
  • any of the liquid crystal display devices 100A and 100B images that are actually visible with respect to the images displayed on the liquid crystal panels 200A and 200B are ⁇ x in the same direction (upward) in the vertical direction. Shift uniformly. Accordingly, the vertical shift amounts of the liquid crystal display devices 100A and 100B coincide with each other, and when the display image is viewed through the light guide elements 300A and 300B, the display image shift (display shift, image shift) that occurs between the liquid crystal display devices 100A and 100B. Offset) is offset. Therefore, since it is possible to display between the liquid crystal display devices 100A and 100B without image displacement, it is difficult to see the frame at the boundary 3.
  • the direction of the boundary line between the adjacent light guide units 310 and the length of the frame region 203 for displaying an image are displayed.
  • the angle ⁇ formed by the pixel rows parallel to the direction is preferably 5 ° ⁇ ⁇ 85 °.
  • the shift direction of the display image is set to the vertical direction. Is not limited to this.
  • the shift of the display image is adjacent to the frame region 203 for displaying the image (that is, the frame region 203 at the boundary portion 3 between the liquid crystal display devices 100A and 100B adjacent to each other when tiling is performed as described above). It occurs along the arrangement pattern of the pixels 201.
  • FIG. 6 is a cross-sectional view showing a light guide element 300A according to the present embodiment.
  • the structure of the light guide elements 300A and 300B will be described using the light guide element 300A as an example.
  • the light guide part 310 of the light guide element 300 ⁇ / b> A has a multilayer structure, and includes a light transmissive part made of a light transmissive layer 324 such as a polymer film and a reflective part made of a metal layer 321. ing. Adjacent light guides 310 are bonded to each other by an adhesive layer 323.
  • FIG. 7 is a cross-sectional view showing an example of the structure of the sheet laminate 320 used in the light guide element 300A.
  • each light guide unit 310 of the light guide element 300 ⁇ / b> A includes a metal layer 321, a light transmissive layer 324, and an adhesive layer 323 as illustrated in FIG. 7.
  • the sheet laminate 320 includes the metal layer 321, the translucent layer 324, and the adhesive layer 323 in the thickness direction (that is, the thickness of the light guides 310 (thickness in the stacking direction) becomes a desired pitch (that is, The layers are stacked repeatedly in this order in parallel with each other in a direction perpendicular to the light propagation direction.
  • the sheet laminate 320 When the sheet laminate 320 is used as the light guide element 300A, the light that has entered the light guide element 300A from the incident surface 301 propagates through the light-transmitting layer 324 and is emitted from the emission surface 302 toward the viewer. At this time, the light incident on the light transmitting layer 324 propagates in the light transmitting layer 324 while being reflected by the adjacent metal layer 321. That is, in the sheet laminate 320, the light-transmitting layer 324 functions as a light guide path (light-transmitting portion), while the boundary surface (layer surface) between the light-transmitting layer 324 and the metal layer 321 functions as a reflecting surface (reflecting portion). To do. Although light is incident on the incident surface 311 from various angles, all light can be guided regardless of the incident angle because the sheet laminate 320 uses metal reflection in the metal layer 321.
  • a sheet laminate 320 in which a plurality of sheets are laminated is prepared.
  • a transparent polymer film (transparent film) to be the light-transmitting layer 324 for example, an acrylic film having a thickness of 75 ⁇ m, a TAC (triacetylcellulose) film, or a COP (cyclo-olefin polymer) is used. Resin) film etc. are prepared. In addition, it is preferable that these films are not extended
  • a silver layer having a thickness of 100 nm is formed on the polymer film as the metal layer 321.
  • the metal layer 321 can be formed by, for example, a vacuum deposition method or the like.
  • an adhesive layer 323 having a thickness of 3 ⁇ m is formed on the silver layer using, for example, a hot-melt adhesive (thermoplastic resin).
  • a hot-melt adhesive thermoplastic resin
  • a plurality of sheets (polymer film, metal layer, and hot melt adhesive) obtained in this manner are stacked and pressure bonded. Thereafter, the plurality of sheets are bonded to each other, for example, by melting the hot melt adhesive in an oven at 140 ° C.
  • the adhesive layer 323 is only required to be a material that is at least light transmissive and that allows films to adhere to each other.
  • a thermosetting adhesive, a photocurable adhesive, or an adhesive can be substituted.
  • the sheet laminate 320 shown in (a) of FIG. 8 is cut along a cutting line (cut plane) that forms a predetermined angle with respect to the boundary surface of the sheet laminate 320.
  • Cut along CL1 and CL2 to cut out a flat sheet laminate 320 having a predetermined thickness from the sheet laminate 320.
  • the sheet laminate 320 can be cut using various known cutting methods. For example, a laser cutting method or the like can be used, but it is particularly preferable to use a multi-wire saw. Since the multi-wire saw is cut using a plurality of wires arranged in parallel to each other, a plurality of flat sheet laminates 320 can be cut out simultaneously.
  • the cut surface of the sheet laminate 320 is subjected to processing such as polishing as necessary, and the surface of the cut sheet laminate 320 is washed and dried as necessary.
  • seat laminated body 320 can be obtained.
  • the surface on which processing such as polishing is performed is appropriately selected as necessary.
  • FIG. 9 is a diagram schematically showing incident light on the metal layer.
  • FIG. 10 is a diagram showing the angle characteristics of the polarization reflectance of the metal layer.
  • angle (phi) shown in FIG. 9 is an incident angle of the incident light to a metal layer.
  • S-polarized light is light polarized parallel to the reflecting surface (metal layer), and P-polarized light is light polarized perpendicular to the reflecting surface (metal layer). It is.
  • ⁇ 0 °
  • the reflectance of both S-polarized light and P-polarized light is approximately 98%, but as ⁇ increases, the reflectance of S-polarized light increases.
  • the inclination angle ⁇ of the light guide element is 45 °
  • the difference in transmittance is further increased.
  • the liquid crystal display device Since the liquid crystal display device emits light in various directions, there is much light incident on the metal layer at an incident angle of 50 ° to 80 °. Therefore, it can be seen that the polarization state of the light incident on the metal layer has a great influence on the transmittance of the light guide element.
  • the polarizing plate since the polarizing plate is disposed on the outermost surface, the emitted light is basically polarized light. Therefore, it is considered that the transmittance of the light guide element can be improved by adjusting the direction of the polarizing plate so that the polarized light incident on the reflection surface of the light guide element becomes S-polarized light.
  • the arrangement of the polarizing plates of the liquid crystal panels 200A and 200B is adjusted so that the highly polarized S-polarized light is incident on the light guide elements 300A and 300B.
  • the arrangement adjustment of the polarizing plate will be described with reference to FIG. 1 and FIG. 1A is a plan view showing the liquid crystal display device 100A, and FIG. 1B shows the inclination direction of the boundary surface 303 in the liquid crystal display device 100A shown in FIG. It is sectional drawing shown.
  • 2A is a plan view showing the liquid crystal display device 100A
  • FIG. 2B is an inclination of the boundary surface 303 in the liquid crystal display device 100A shown in FIG. It is sectional drawing which shows a direction.
  • the arrangement of the polarizing plates of the liquid crystal display devices 100A and 100B will be described.
  • the direction of the boundary surface 303 of the light guide element 300A and the polarizing plate are arranged so that the directions of the light transmission axis (arrow ⁇ in the figure) are parallel to each other. Therefore, the direction in which the boundary surface 303 extends in the plane direction coincides with the direction of the light transmission axis of the polarizing plate. Accordingly, since S-polarized light is incident on the light guide element 300A, it is possible to suppress a decrease in reflectance in the metal layer 321.
  • the transmittance of the light guide elements 300A and 300B is improved. Therefore, since the transmittance of the light guide elements 300A and 300B is low, it is not necessary to compensate for the decrease in the luminance of the liquid crystal display devices 100A and 100B by increasing the luminance of the backlight device 400, and thus the liquid crystal display devices 100A and 100B. It is possible to solve the problem that the power consumption increases.
  • the direction of the boundary surface 303 between the light guide portions 310 adjacent to each other in plan view that is, when the liquid crystal display device 100A is viewed from above.
  • a pixel row parallel to the longitudinal direction of the frame region 203 for displaying an image is inclined at an angle ⁇ with respect to the longitudinal direction of the frame region 203. It is preferable to set the direction of the light transmission axis. That is, also in this case, the direction in which the boundary surface 303 extends in the surface direction coincides with the direction of the light transmission axis of the polarizing plate. Accordingly, since S-polarized light is incident on the light guide element 300A, it is possible to suppress a decrease in reflectance in the metal layer 321.
  • the material used for the translucent layer 324 has a characteristic (birefringence) that changes the polarization state of light, the polarization state of the light changes as light is guided through the translucent layer 324 (that is, However, the reflectivity of the metal layer also decreases. Therefore, it is preferable to use a material with little birefringence for the light-transmitting layer 324, and it is more preferable to use a material with little birefringence (non-birefringent material).
  • a PET film generally used industrially has a relatively large birefringence, and therefore has a great influence on the reflectance.
  • an acrylic film, a TAC film, a COP film, or the like is preferably used as the light-transmitting layer 324 because of low birefringence and high transmittance.
  • a glass substrate may be used for the light-transmitting layer 324 as a non-birefringent material.
  • stretching with respect to said film, since there exists a possibility that birefringence may arise in an extending
  • a PET film and a PC (polycarbonate) film having a relatively large birefringence have a retardation of about 20 nm or more in a general thickness (for example, 100 ⁇ m).
  • an acrylic film, a TAC film, and a COP film having relatively small birefringence have a retardation of about 10 nm or less at a general thickness (for example, 80 to 100 ⁇ m).
  • the retardation of the TAC film and the COP film is 5 nm or less. Since the glass substrate is basically isotropic, birefringence is zero. From the above, it can be said that the preferable condition for the material used for the light-transmitting layer 324 is a retardation of 10 nm or less, more preferably 5 nm or less.
  • Example 1 and Comparative Example 1 The liquid crystal display device 100A including the light guide element 300A manufactured based on the first embodiment described above is referred to as Example 1, and a liquid crystal display device including the following light guide element is manufactured as Comparative Example 1, and Example 1 is performed. And Comparative Example 1 was examined.
  • FIG. 11 is a cross-sectional view showing a light guide element manufactured as Comparative Example 1.
  • Example 1 a liquid crystal display device 100A including a light guide element 300A as shown in FIG. A light guide element 300A using a silver layer as the metal layer 321 and an acrylic film as the light-transmitting layer 324 was manufactured.
  • Comparative Example 1 a liquid crystal display device including a light guide element 300E using a PET film as the light-transmitting layer 324 was produced.
  • a light guide element 300E using a silver layer as the metal layer 321 was manufactured in the same manner as in Example 1 except that a PET film was used as the light transmissive layer 324.
  • Example 1 The luminance of each liquid crystal display device of Example 1 and Comparative Example 1 was measured using a luminance meter (MB-5A manufactured by Topcon Corporation). When the luminance before and after the light guide element was measured and the ratio was determined as the transmittance, it was as shown in Table 1.
  • Example 1 As shown in Table 1, in Example 1, a very high transmittance was obtained. On the other hand, in Comparative Example 1, the decrease in luminance was remarkably large.
  • Example 1 and Comparative Example 1 will be described in detail.
  • Example 1 Comparative Example 1
  • the transmittance was lowered by using a PET film as the light-transmitting layer.
  • the PET film has a relatively large birefringence and changes the polarization state of light. If the polarization state of the light changes, the light incident on the light guide element is not S-polarized light, which greatly affects the reflectance. Therefore, it was found that the transmittance can be improved by using an acrylic film, a TAC film, a COP film or the like having a small birefringence as the light transmitting layer.
  • FIG. 12 is a plan view showing liquid crystal display devices 100C and 100D manufactured as Comparative Example 2
  • FIG. 12 is a liquid crystal display device 100C shown in (a) in FIG. -It is sectional drawing which shows the inclination direction of the boundary surface 303 in 100D.
  • the direction of the boundary surface 303 of the light guide elements 300C and 300D and the direction of the light transmission axis of the polarizing plate are parallel to each other in plan view (that is, when the liquid crystal display devices 100C and 100D are viewed from above).
  • the polarizing plate is arranged so as not to become. Therefore, the direction in which the boundary surface 303 extends in the surface direction does not match the direction of the light transmission axis of the polarizing plate.
  • Example 2 when the angle between the direction of the boundary surface 303 of the light guide element 300D and the direction of the light transmission axis of the polarizing plate (arrow ⁇ in the figure) is ⁇ ′, the comparison is made.
  • FIG. 13 shows data of transmittance corresponding to the angle ⁇ ′ in the configuration of Comparative Example 2.
  • FIG. 13 is a diagram showing the results of luminance measurement using a luminance meter (MB-5A manufactured by Topcon) from the normal direction of the liquid crystal display devices 100C and 100D.
  • the polarizing plate it is most preferable to dispose the polarizing plate so that the direction of the boundary surface 303 of the light guide elements 300C and 300D is parallel to the direction of the light transmission axis of the polarizing plate.
  • the amount of decrease in transmittance is in the range of about 10%.
  • FIG. 14 is a plan view showing liquid crystal display devices 100A and 100B according to the present embodiment
  • FIG. 14 is liquid crystal display device 100A shown in (a) in FIG. It is sectional drawing which shows the inclination direction of the boundary surface 303 in FIG.
  • the case where the flat light guide elements 300A and 300B are provided on the entire display surface of the liquid crystal panels 200A and 200B has been described as an example.
  • the case where the light guide elements 300 ⁇ / b> A and 300 ⁇ / b> B are provided only in the part area will be described as an example.
  • an image is displayed on the frame region 203 adjacent to each other with the boundary 3 between the liquid crystal display devices 100A and 100B.
  • the light guide elements 300A and 300B are provided only in the frame regions 203 at the ends adjacent to each other in the liquid crystal display devices 100A and 100B and in the vicinity thereof. Is provided. Accordingly, the area where the light guide elements 300A and 300B are provided can be reduced, and the manufacturing cost of the liquid crystal display devices 100A and 100B can be reduced.
  • light guide elements 300A and 300B can be provided as in the liquid crystal display devices 100A and 100B shown in FIG. (A) in FIG. 15 is a plan view showing the liquid crystal display devices 100A and 100B according to the present embodiment, and (b) in FIG. 15 is a liquid crystal display device 100A shown in (a) in FIG. It is sectional drawing which shows the inclination direction of the boundary surface 303 in FIG.
  • the light guide elements 300A and 300B used in the present embodiment have the incident surfaces 301 parallel to the display surfaces of the liquid crystal panels 200A and 200B, but the exit surfaces 302 are in relation to the display surfaces of the liquid crystal panels 200A and 200B. Is inclined. More specifically, the exit surfaces of the light guide elements 300A and 300B have a thickness that increases toward the end facing the adjacent ends of the liquid crystal panels 200A and 200B. It is inclined with respect to the display surface of 200B.
  • the light guide elements 300A and 300B have a rectangular shape (square shape or rectangular shape) in plan view.
  • the incident surfaces 301 of the light guide elements 300A and 300B are formed flat (that is, flat).
  • the liquid crystal display devices 100A and 100B emit light from the display regions 202 of the liquid crystal panels 200A and 200B and the light guide elements 300A and 300B, as indicated by dotted lines in FIG. 14B and FIG. 15B.
  • the translucent cover sheets 350A and 350B are formed, for example, along the shapes of the emission surfaces 302 of the light guide elements 300A and 300B and the display surfaces of the liquid crystal panels 200A and 200B.
  • the light guide elements 300A and 300B and the translucent cover sheets 350A and 350B are bonded to each other through, for example, an adhesive layer.
  • the adhesive layer is not necessarily required, and the light guide elements 300A and 300B and the translucent cover sheets 350A and 350B may be fixed via an air layer.
  • the display surfaces of the light guide elements 300A and 300B and the liquid crystal panels 200A and 200B are protected by bonding the light-transmitting cover sheets 350A and 350B to the light guide elements 300A and 300B to form a flat sheet. can do.
  • the surfaces of the liquid crystal display devices 100A and 100B are flattened, the uncomfortable appearance is reduced.
  • the translucent cover sheets 350A and 350B are formed of a transparent resin such as an acrylic resin, for example. By providing the translucent cover sheets 350A and 350B, the display quality of the liquid crystal display devices 100A and 100B can be improved.
  • the translucent cover sheets 350A and 350B are not always necessary. That is, according to the present embodiment, it is not necessary to use a light guide element having the same size as the liquid crystal panels 200A and 200B. Therefore, it is possible to reduce the weight of the liquid crystal display devices 100A and 100B and the electronic devices using the liquid crystal display devices 100A and 100B, and to manufacture these devices or devices at low cost.
  • the light guide element 300A as described above can be provided, for example, in two opposing frame regions 203 in one liquid crystal panel, and the inclination angle and the inclination direction of the boundary surface 303 of the light guide unit 310. Can be set for each light guide element 300A. Therefore, for example, by providing a light guide element in each of two opposing frame regions 203 in one liquid crystal panel, whether or not a plurality of liquid crystal display devices are used, or a boundary portion between the liquid crystal display devices An image can be displayed in each frame area 203 regardless of whether or not. For this reason, a much larger display screen can be realized.
  • the direction of the boundary surface 303 of the light guide element 300A and the direction of the light transmission axis of the polarizing plate are arranged so that are parallel to each other. Therefore, the direction in which the boundary surface 303 extends in the plane direction coincides with the direction of the light transmission axis of the polarizing plate. Accordingly, since S-polarized light is incident on the light guide element 300A, it is possible to suppress a decrease in reflectance in the metal layer 321.
  • the transmittance of the light guide elements 300A and 300B is improved. Therefore, since the transmittance of the light guide elements 300A and 300B is low, it is not necessary to compensate for the decrease in the luminance of the liquid crystal display devices 100A and 100B by increasing the luminance of the backlight device 400, and thus the liquid crystal display devices 100A and 100B. It is possible to solve the problem that the power consumption increases.
  • the display device As described above, the display device according to one embodiment of the present invention is characterized in that the retardation of the light-transmitting layer is 10 nm or less.
  • the display device is characterized in that the retardation of the light transmitting layer is 5 nm or less.
  • the polarization state of incident light can be prevented from changing due to the characteristics (birefringence) of the light transmitting layer. Therefore, by using a material with low birefringence for the light-transmitting layer, the polarization state of the light incident on the light guide element does not change, and S-polarized light is incident. Therefore, it is possible to suppress a decrease in reflectance in the reflective layer. .
  • the display device is characterized in that the light-transmitting layer is any one of an acrylic film, a triacetyl cellulose film, a cycloolefin resin film, and a glass substrate.
  • acrylic film, triacetyl cellulose film, cycloolefin resin film, and glass substrate are materials with relatively little birefringence, according to the above configuration, the change in the polarization state of light incident on the light guide element can be suppressed. Can do.
  • an incident surface of the light guide element is parallel to the display surface of the display panel, and an output surface of the light guide element is at an end of the display panel.
  • the display panel is inclined with respect to the display surface so as to increase in thickness, and the light guide element has a triangular triangular cross section in a direction perpendicular to the end of the display panel. It is characterized by.
  • the light guide element is provided only in the display area and the vicinity thereof. Accordingly, the area where the light guide element is provided can be reduced, so that the manufacturing cost of the display device can be reduced. Moreover, since it is possible to make it difficult to see the regions on the left and right sides of the display device, a tile display in which display devices having three or more screens are arranged can be configured.
  • the electronic device is characterized in that it can be folded at a boundary portion between the adjacent display devices.
  • the display device can be folded at the boundary between the display devices, and the relative angle of the display surfaces of these display devices can be changed.
  • the present invention can be used for various electronic devices having a display unit such as a mobile phone, an electronic book, a game machine, a TV (television), or a public bulletin board for outdoor use.
  • a display unit such as a mobile phone, an electronic book, a game machine, a TV (television), or a public bulletin board for outdoor use.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

Selon l'invention, un élément de guidage de lumière (300A) est monté sur un dispositif d'affichage à cristaux liquides (100A) constituant un mode de réalisation de la présente invention et comporte une pluralité de sections de guide de lumière (310). Par ailleurs, chaque section de guide de lumière (310) comprend : une section transparente comprenant une couche transparente (324) ; et une section réfléchissante comprenant une couche métallique (321). Dans le dispositif d'affichage à cristaux liquides (100A), une lame polarisante est disposée de telle manière que, dans une vue en plan (c'est-à-dire lorsqu'on observe le dispositif d'affichage à cristaux liquides (100A) de dessus), la direction de la surface de bord (303) de l'élément de guide de lumière (300A) et la direction (flèche alpha sur la figure) de l'axe de transmission de la lumière de la lame polarisante soient parallèles l'une à l'autre. Par conséquent, la direction d'extension de la surface de bord (303) dans la direction du plan et la direction de l'axe de transmission de la lumière de la lame polarisante concordent.
PCT/JP2012/059042 2011-04-06 2012-04-03 Dispositif d'affichage et appareil électronique muni du dispositif d'affichage WO2012137762A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-084430 2011-04-06
JP2011084430 2011-04-06

Publications (1)

Publication Number Publication Date
WO2012137762A1 true WO2012137762A1 (fr) 2012-10-11

Family

ID=46969159

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/059042 WO2012137762A1 (fr) 2011-04-06 2012-04-03 Dispositif d'affichage et appareil électronique muni du dispositif d'affichage

Country Status (1)

Country Link
WO (1) WO2012137762A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07128652A (ja) * 1993-10-28 1995-05-19 Hewlett Packard Co <Hp> 液晶表示装置
JP2000056713A (ja) * 1998-08-04 2000-02-25 Sharp Corp ディスプレイユニットおよび複合型ディスプレイ、並びに、ディスプレイモジュール
JP2001005414A (ja) * 1999-05-31 2001-01-12 Samsung Sdi Co Ltd マルチディスプレイ装置
JP2009198688A (ja) * 2008-02-20 2009-09-03 Sharp Corp 表示装置
WO2009122691A1 (fr) * 2008-03-31 2009-10-08 シャープ株式会社 Dispositif d’affichage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07128652A (ja) * 1993-10-28 1995-05-19 Hewlett Packard Co <Hp> 液晶表示装置
JP2000056713A (ja) * 1998-08-04 2000-02-25 Sharp Corp ディスプレイユニットおよび複合型ディスプレイ、並びに、ディスプレイモジュール
JP2001005414A (ja) * 1999-05-31 2001-01-12 Samsung Sdi Co Ltd マルチディスプレイ装置
JP2009198688A (ja) * 2008-02-20 2009-09-03 Sharp Corp 表示装置
WO2009122691A1 (fr) * 2008-03-31 2009-10-08 シャープ株式会社 Dispositif d’affichage

Similar Documents

Publication Publication Date Title
KR102046152B1 (ko) 편광판 및 이를 포함하는 액정 표시 장치
TWM570442U (zh) 顯示裝置
CN107942571B (zh) 线栅偏光器以及使用此线栅偏光器的显示面板
US20090040440A1 (en) Color compensation multi-layered member for display apparatus, optical filter for display apparatus having the same and display apparatus having the same
WO2018096569A1 (fr) Dispositif d&#39;affichage à cristaux liquides
WO2011132528A1 (fr) Dispositif et système d&#39;affichage, procédé de commande d&#39;affichage associé, dispositif électronique, programme, support d&#39;enregistrement lisible par ordinateur et élément guide de lumière
WO2013179813A1 (fr) Dispositif d&#39;affichage
KR20060052259A (ko) 액정 표시 장치
US9478158B2 (en) Display apparatus with transmissive and reflective subpixels
JP2014182280A (ja) 表示装置
US20120293744A1 (en) Light guide sheet and display device
JP2007034308A (ja) 液晶表示装置とその製造方法
JP2009289592A (ja) 表示装置
WO2001033290A1 (fr) Afficheur a cristaux liquides a reflexion, afficheur a cristaux liquides semi-emetteur et dispositif electronique
KR20090058992A (ko) 다중시각 표시장치
CN212461009U (zh) 一种显示屏、拼接显示屏和显示装置
KR20150000743A (ko) 표시장치 및 이의 제조방법
JP2013214070A (ja) ディスプレイパネル及びこれを有するディスプレイ装置
US20210263352A1 (en) Display device
WO2018181079A1 (fr) Panneau d&#39;affichage à cristaux liquides et procédé de fabrication de panneau d&#39;affichage à cristaux liquides
WO2015166833A1 (fr) Afficheur à miroir
JPWO2019116618A1 (ja) 画像表示装置
JP5114853B2 (ja) 表示装置
US20050157231A1 (en) Transflective mode liquid crystal display
WO2012137762A1 (fr) Dispositif d&#39;affichage et appareil électronique muni du dispositif d&#39;affichage

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12767794

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12767794

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP