WO2017138364A1 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2017138364A1
WO2017138364A1 PCT/JP2017/002699 JP2017002699W WO2017138364A1 WO 2017138364 A1 WO2017138364 A1 WO 2017138364A1 JP 2017002699 W JP2017002699 W JP 2017002699W WO 2017138364 A1 WO2017138364 A1 WO 2017138364A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
display device
crystal display
transparent adhesive
adhesive member
Prior art date
Application number
PCT/JP2017/002699
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English (en)
Japanese (ja)
Inventor
貴典 奥村
岩崎　直子
俊明 藤野
太郎 熊谷
Original Assignee
三菱電機株式会社
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.)
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Publication of WO2017138364A1 publication Critical patent/WO2017138364A1/fr

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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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements

Definitions

  • the present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device capable of displaying an image on a curved screen.
  • a liquid crystal display device which is a flat display device is used in portable information devices typified by personal computers, taking advantage of light weight, thinness, and low power consumption.
  • Liquid crystal display devices include various types of liquid crystal panels, backlight units, and liquid crystal display devices in which liquid crystal is sandwiched between a pair of substrates in which an array substrate having pixel electrodes and a color filter substrate having a common electrode are bonded to each other.
  • the circuit includes a circuit and a power source for supplying an electric signal, and a housing for housing them.
  • the liquid crystal display device changes the molecular orientation direction of the liquid crystal by applying a voltage between the pixel electrode and the common electrode, and displays the image by controlling the transmittance when the light from the backlight passes through the liquid crystal. I do.
  • a substrate constituting the array substrate and the color filter substrate for example, a parallel plate substrate having a planar surface (hereinafter sometimes referred to as “planar substrate”) is used.
  • planar substrate a parallel plate substrate having a planar surface
  • various technologies such as a technology that applies a flexible material such as plastic to a substrate, a technology that thinly processes a glass substrate, and deforms and fixes the substrate and thus the liquid crystal display device into a curved shape.
  • a technology that applies a flexible material such as plastic to a substrate a technology that thinly processes a glass substrate, and deforms and fixes the substrate and thus the liquid crystal display device into a curved shape.
  • a liquid crystal display device using a casing having a side that is higher in rigidity than a liquid crystal panel and has a curved groove that holds the curvature of the liquid crystal panel, or a frame that sandwiches the liquid crystal panel together with a backlight unit or the like A liquid crystal display device having a curved shape has been proposed.
  • Patent Literature 1 discloses a technique for displaying a curved image without causing problems due to the bending.
  • Patent Document 1 includes a plurality of flat display elements arranged at a constant angle, and an optical element arranged in the vicinity of a region of adjacent display elements, thereby providing a non-planar shape.
  • a display device having the display surface is disclosed.
  • the optical element for example, an optical fiber that optically transmits image light incident on the display element to a non-planar exit surface is used.
  • a film covering the joint of the optical fibers is attached.
  • Patent Document 2 discloses a technique for making a joint between display elements inconspicuous by connecting a plurality of display elements with a sheet-like member or a transparent support substrate with a transparent adhesive. ing.
  • Patent Document 3 and Patent Document 4 a portion including an end portion between display elements is filled with an adhesive, and the refractive index of the adhesive is made equal to the refractive index of the substrate of the display element. Has been disclosed.
  • Patent Document 1 has a problem that the manufacturing process becomes complicated and expensive because there are many components. Further, since the straightness of light of the optical fiber used for the optical element is high, there is a problem that the angle of the image seen from the optical fiber is different and the display quality is lowered. Moreover, in the technique of patent document 2, since a support substrate is bent and used, there exists a problem that the bent part tends to deteriorate, and as a result, a joint is conspicuous and display quality falls.
  • the present invention has been made in view of the above problems, and an object thereof is to provide a technique capable of obtaining a good display quality with a simple structure.
  • the liquid crystal display device corresponds to a plurality of display panels each having a flat display surface, a first main surface including a bent surface composed of a plurality of flat surfaces, and a bent portion of the bent surface.
  • a front protective plate having a second main surface opposite to the first main surface, including a curved surface provided, and a display area for displaying an image among the display surfaces of each display panel
  • a transparent adhesive member in which the display surfaces of the plurality of display panels and the plurality of planar surfaces of the first main surface are bonded together in a state of being adjacent to each other.
  • the front protective plate is made of a single material, and the transparent adhesive member is continuously disposed on each of the adjacent display areas and on the bent portion of the bent surface between the adjacent display areas. ing.
  • the front protective plate is made of a single material, and the transparent adhesive member is continuously disposed in each of the adjacent display areas and the bent portion of the bent surface between the adjacent display areas. Has been. Thereby, a favorable display quality can be obtained with a simple structure.
  • FIG. 1 is a perspective view showing a configuration of a liquid crystal display device according to Embodiment 1.
  • FIG. 1 is a cross-sectional view illustrating a configuration of a liquid crystal display device according to Embodiment 1.
  • FIG. 5 is a cross-sectional view showing the method of manufacturing the liquid crystal display device according to Embodiment 1.
  • FIG. 3 is a front view illustrating the method for manufacturing the liquid crystal display device according to the first embodiment.
  • FIG. 6 is a rear view showing the method of manufacturing the liquid crystal display device according to the first embodiment.
  • 5 is a cross-sectional view showing the method of manufacturing the liquid crystal display device according to Embodiment 1.
  • FIG. 5 is a cross-sectional view showing the method of manufacturing the liquid crystal display device according to Embodiment 1.
  • FIG. 5 is a cross-sectional view showing the method of manufacturing the liquid crystal display device according to Embodiment 1.
  • FIG. 5 is a cross-sectional view showing the method of manufacturing the liquid crystal display device according to
  • FIG. 4 is a cross-sectional view showing the operation of the liquid crystal display device according to Embodiment 1. It is sectional drawing which shows the structure of the liquid crystal display device which concerns on a modification.
  • 6 is a cross-sectional view illustrating a configuration of a liquid crystal display device according to Embodiment 2.
  • FIG. 10 is a cross-sectional view showing the method of manufacturing the liquid crystal display device according to Embodiment 2.
  • FIG. 10 is a cross-sectional view showing the method of manufacturing the liquid crystal display device according to Embodiment 2.
  • FIG. FIG. FIG. 10 is a cross-sectional view showing the method of manufacturing the liquid crystal display device according to Embodiment 2.
  • FIG. 11 is a rear view showing the method for manufacturing the liquid crystal display device according to the second embodiment.
  • 10 is a cross-sectional view showing the method of manufacturing the liquid crystal display device according to Embodiment 2.
  • FIG. 10 is a cross-sectional view showing the method of manufacturing the liquid crystal display device according to Embodiment 2.
  • FIG. 6 is a cross-sectional view showing an operation of the liquid crystal display device according to Embodiment 2.
  • FIG. 6 is a cross-sectional view showing an operation of the liquid crystal display device according to Embodiment 2.
  • FIG. 6 is a cross-sectional view illustrating a configuration of a liquid crystal display device according to Embodiment 3.
  • FIG. 11 is a rear view showing the method for manufacturing the liquid crystal display device according to the third embodiment.
  • FIG. 10 is a cross-sectional view showing the operation of the liquid crystal display device according to the third embodiment.
  • FIG. 10 is a cross-sectional view showing the operation of the liquid crystal display device according to the third embodiment.
  • the dimensions, materials, shapes, relative arrangements, and the like of the constituent elements exemplified in the embodiments are appropriately changed depending on the configuration of the apparatus to which the present invention is applied and various conditions. Are not limited to those examples. Moreover, the dimension of each component in each figure may differ from an actual dimension.
  • FIG. 1 is a perspective view showing a configuration of the liquid crystal display device 100 according to the first embodiment
  • FIG. 2 is a cross-sectional view showing the configuration.
  • the liquid crystal display device 100 is applied to, for example, a monitor of a PC (Personal Computer), a mobile terminal such as a PDA (Personal Digital Assistant), a game machine, a television receiver, a car navigation device, an in-vehicle monitor, and the like.
  • a monitor of a PC Personal Computer
  • PDA Personal Digital Assistant
  • the liquid crystal display device 100 includes two (plural) display panels 10, a front protective plate 30, a printing layer 40, and a transparent adhesive member 50. Although not shown, the liquid crystal display device 100 includes a backlight unit, flexible wiring, an adhesive tape and screws for fixing the display panel 10 in addition to these components.
  • Each display panel 10 includes a rectangular first substrate, a rectangular second substrate disposed closer to the viewer than the first substrate, and a liquid crystal sandwiched between the first substrate and the second substrate. Is provided.
  • Each display panel 10 is a liquid crystal panel including a polarizing plate 21 attached to the surface opposite to the liquid crystal of the first substrate and a polarizing plate 20 attached to the surface opposite to the liquid crystal of the second substrate. is there.
  • Each of the plurality of display panels 10 configured in this manner has a flat display surface 10a capable of displaying an image.
  • the display surface 10a defines a display area in which a plurality of pixels are arranged and an image can be displayed.
  • a rectangular region that is the same as the polarizing plates 20 and 21 in a plan view or a rectangular region that is smaller than the polarizing plates 20 and 21 is applied to the display region (not shown).
  • a backlight (not shown) is disposed near the surface of the display panel 10 opposite to the display surface 10a.
  • a polarizing plate 20 is attached to one surface (display surface 10a) of the display panel 10, and a polarizing plate 21 is attached to the other surface.
  • the polarizing plates 20 and 21 may be polarizing films or polarizing plates.
  • a hard coat layer or an antiglare layer may be provided on the surfaces of the polarizing plates 20 and 21 as appropriate.
  • the front protective plate 30 is a transparent plate that hardly absorbs visible light.
  • the front protective plate 30 is made of a single material, and includes, for example, a glass plate, a laminated glass, a resin plate (for example, a polycarbonate-based resin, an acrylic resin) whose strength is improved by using an ion exchange method or an air cooling strengthening method. Resin plate such as a resin based on cycloolefin resin).
  • the front protective plate 30 has a first main surface 30a and a second main surface 30b opposite to the first main surface 30a.
  • the first main surface 30a includes a bent surface composed of two surfaces 30a1 and 30a2 (a plurality of planar surfaces). For example, one side of the surface 30a1 and one side of the surface 30a2 are connected at an angle of about 90 to 170 degrees, so that a bent surface that is bent at the bent portion 31 is formed.
  • the display surfaces 10a of the two display panels 10 are bonded to the two surfaces 30a1 and 30a2 of the first main surface 30a by the transparent adhesive member 50, respectively.
  • the total area of the two planar surfaces 30a1 and 30a2 of the first main surface 30a is larger than the total area of the display surfaces 10a of the two display panels 10.
  • the number of display panels 10 is two, but may be three or more.
  • the second main surface 30b includes a curved surface provided corresponding to the bent portion 31 of the bent surface of the first main surface 30a.
  • the second main surface 30b is a non-planar image display surface for viewing an image, which is disposed on the side (observer side) viewing the image from the display panel 10.
  • the second main surface 30b is subjected to an anti-glare process, an anti-reflection process, a hard coat process for preventing scratches, and the like as necessary to improve visibility.
  • the front protective plate 30 viewed from the viewpoint 1 shown in FIG. 2 is assumed to be rectangular as shown in FIG.
  • the shape is not particularly limited, and may be, for example, a triangle shape, an n-corner shape (n is an integer of 5 or more), a shape including an arc, or the like.
  • the display panel 10 and the transparent adhesive member 50 can have any desired shape, similar to the shape of the front protective plate 30.
  • the touch sensor may be attached in advance to the second main surface 30b or the first main surface 30a of the front protective plate 30 via a transparent adhesive or the like.
  • the touch sensor generally uses a film substrate or a glass substrate, but is not particularly limited as long as it has a touch sensor function.
  • the surface of the touch sensor is hard-coated for anti-glare treatment, anti-reflection treatment, anti-fouling treatment and scratch prevention for improving visibility. Processing or the like is performed as necessary.
  • the print layer 40 may or may not be disposed on the first main surface 30a or the second main surface 30b of the front protective plate 30.
  • the presence or absence of the print layer 40 is not particularly limited.
  • the printed layer 40 is a layer for decoration (for decoration), for example, but is not limited to decoration (for decoration), and may be a layer for other purposes.
  • the print layer 40 is made of, for example, a material that almost shields light having a wavelength in the visible region, or a paint that includes a colorant pigment. More specifically, the printing layer 40 is made of, for example, an acrylic resin blended with carbon black. In this case, the color of the print layer 40 is black or the like, but the color of the print layer 40 may be a color other than black having light shielding properties.
  • the printing layer 40 is arranged according to the display area of the display panel 10, and is arranged in a closed loop surrounding the display area, for example. From the viewpoint of design, the positions of the end of the element that displays the image of the display panel 10 (end of the display area) and the open end of the print layer 40 (open end 41 and 42 in FIG. 4). It is preferable to apply a size that minimizes the difference between the two to the dimension of the printing layer 40.
  • the printed layer 40 only needs to satisfy desired performance in terms of design properties, light shielding properties, and the like, and the formation method is not particularly limited.
  • the print layer 40 is formed, for example, by applying a resin using a screen printing method.
  • the thickness of the printing layer 40 is generally about 3 to 70 ⁇ m, for example, but the thickness design is changed according to the intensity of the light source to be shielded from light.
  • the thickness of the coating film of the printing layer 40 is preferably about 10 to 70 ⁇ m so that sufficient light shielding properties can be obtained.
  • the thickness of the coating film of the printing layer 40 is preferably about 3 to 40 ⁇ m.
  • the transparent adhesive member 50 has translucency.
  • the transparent adhesive member 50 includes the display surfaces 10a of the two display panels 10 and the first main surface 30a of the front protective plate 30 in a state where the above-described display areas of the display surfaces 10a of the display panels 10 are adjacent to each other.
  • the two surfaces 30a1 and 30a2 are bonded to each other.
  • the transparent adhesive member 50 is continuously arrange
  • the transparent adhesive member 50 may be formed of one layer or a plurality of layers.
  • the transparent adhesive member 50 may be formed by sticking a transparent adhesive sheet that has been processed into a sheet shape, or a plurality of layers (transparent adhesive) may be substantially uniformly surfaced with a predetermined thickness by a slit coating method. You may form by forming in a shape.
  • the transparent adhesive member 50 is described as being formed of a single layer of transparent adhesive sheet.
  • the refractive index of the transparent adhesive member 50 is substantially the same (substantially the same) as the refractive index of the front protective plate 30. According to such a configuration, it is possible to suppress a reflection and a decrease in transmittance due to different refractive indexes, and thus it is possible to suppress a decrease in display quality.
  • the transparent adhesive member 50 is made of a transparent adhesive resin.
  • the transparent adhesive member 50 is made of a highly transparent material such as acrylic, silicone, or urethane.
  • the formation method and thickness of the transparent adhesive member 50 are not specifically limited, it is suitably adjusted according to other structural members.
  • one type or a plurality of types of ultraviolet curable adhesive resins may be used as the adhesive resin of the transparent adhesive member 50.
  • the adhesive resin of the transparent adhesive member 50 may be, for example, a thermosetting adhesive resin or an adhesive resin that uses both thermosetting and ultraviolet curable.
  • thermosetting pressure-sensitive adhesive resins are limited in how they are stored and handled during production, it is assumed that UV-curable pressure-sensitive adhesive resins are often used.
  • one adhesive sheet is used as the transparent adhesive member 50.
  • the storage elastic modulus measured under the conditions of a temperature of 25 degrees and a frequency of 1 hertz was on the order of 0.1 to 1 megapascal.
  • the transparent adhesive member 50 has a high value. Flexibility is required. Further, when the flexibility of the transparent adhesive member 50 is low, it is difficult to adhere at the interface with the polarizing plate 20 of the display panel 10, and there is a problem that bubbles are generated and the bubbles are visually recognized. For these reasons, the transparent adhesive member 50 needs high flexibility. It should be noted that the flexibility of the transparent adhesive member 50 is appropriately adjusted so that the flexibility is suitable depending on the size and type of the display panel 10 and other components.
  • FIGS. 3, 6, and 7 are cross-sectional views illustrating the manufacturing method.
  • FIG. 4 is a front view of the image display surface of the liquid crystal display device 100 as viewed from the viewpoint 1 in FIG.
  • FIG. 5 is a back view of the image display surface of the liquid crystal display device 100 as viewed from the viewpoint 2 in FIG. 2 in the direction of the arrow.
  • the front protective plate 30 is made of a single material made only of acrylic resin and is manufactured by an injection molding method.
  • the material of the front protective plate 30 is preferably a transparent single material having a light transmittance of 80% or more.
  • the type of the material is not particularly limited.
  • a polycarbonate resin, a cycloolefin resin, or the like should be used. You can also.
  • an appropriate preparation method is selected for the front protective plate 30 so that optical anisotropy does not occur within a range in which the optical characteristics of the liquid crystal do not change. Optimized fabrication conditions are used.
  • the refractive index of an arbitrary portion of the front protective plate 30 becomes constant. For this reason, generation
  • the first main surface 30a of the front protective plate 30 includes a bent surface formed of two planar surfaces 30a1 and 30a2 connected at a constant angle (for example, 120 degrees). . That is, the first main surface 30a is bent at an angle of 120 degrees at the bent portion 31.
  • the number of the first main surface 30a is not limited to two, and there may be a plurality of surfaces. When there are three or more surfaces of the first main surface 30a, a plurality of bent portions 31 are formed.
  • the shape of the bent portion 31 in cross-section is not a square shape but an arc shape having a radius of curvature of about 0.5 to 5 mm, which is smaller than the curved surface of the second main surface 30b, due to the influence of manufacturing accuracy. There is.
  • the second main surface 30b of the front protective plate 30 includes a curved surface that is recessed with a uniform curvature radius (for example, 500 mm) toward the bent portion 31 of the first main surface 30a.
  • a uniform curvature radius for example, 500 mm
  • a desired curvature radius according to the application and design of the liquid crystal display device 100 is used.
  • the second main surface 30b may be formed by appropriately combining a plurality of curved surfaces of arcs having a plurality of radii of curvature, a plurality of curved surfaces in an uneven direction, and a flat surface.
  • a printing layer 40 is formed on the front protective plate 30. As shown in FIG. 4, the printing layer 40 is formed around the first main surface 30 a of the front protective plate 30 and in the central portion, and has two closed loop shapes. As a result, the printing layer 40 is provided with two openings. In FIG. 4, the print layer 40 is located on the back side of the front protective plate 30, but the print layer 40 is illustrated because the front protective plate 30 is transparent.
  • the opening end portions 41 and 42 of the printing layer 40 are respectively arranged outside the display area of the display panel 10, and the opening of the printing layer 40 is larger than the display area of the corresponding display panel 10.
  • the printed layer 40 is also disposed on both side surfaces 30c of the front protective plate 30 (the front and rear surfaces of the front protective plate 30 in FIG. 2).
  • an acrylic paint blended with light-shielding carbon black is applied as a material of the printing layer 40.
  • the transparent adhesive member 50 is attached to the first main surface 30a of the front protective plate 30 as shown in FIG. 3 (step 1).
  • the transparent adhesive member 50 is, for example, an acrylic sheet that is a plate-shaped, semi-curable transparent adhesive sheet having a thickness of 250 ⁇ m.
  • the transparent adhesive member 50 has semi-curability, when the front protective plate 30 is attached, the step of the printed layer 40 can be embedded because the transparent adhesive member 50 is highly flexible, and the display panel 10 is attached. Later, since the transparent adhesive member 50 can be cured by UV or heat, long-term reliability can be improved. For this reason, applying a semi-curing member to the transparent adhesive member 50 is effective for products that require high display quality and long-term reliability.
  • the transparent adhesive member 50 may not have semi-curing characteristics. Moreover, there is no restriction
  • the transparent adhesive member 50 there is no restriction
  • a transparent adhesive resin is formed into a surface with a thickness of 250 micrometers by a slit coating method
  • the transparent adhesive resin is irradiated with ultraviolet light having an integrated light amount of 0.3 Joule / square centimeter from the second main surface 30b side.
  • the transparent adhesive member 50 may be formed by temporary curing at a curing degree of 50% or more.
  • ozone treatment, plasma treatment, etc. generally known as wettability improvement processing are generally performed on the surface of the front protective plate 30 and the printing layer 40 on which the transparent adhesive member 50 is affixed.
  • the process of may be implemented.
  • the transparent adhesive member 50 is pasted so as to cover the opening end 41 and the opening end 42 of the printing layer 40 without any seam. That is, the transparent adhesive member 50 which is one adhesive sheet is affixed so that the opening edge part 41 and the opening edge part 42 of the printing layer 40, and the printing layer 40 of the center part may be covered. Thereby, the transparent adhesive member 50 is continuously formed in the display area of the two adjacent display panels 10 and the bent portion 31 of the bent surface between the display areas of the two display panels 10. Therefore, as shown in FIG. 5, the peripheral edge 501 of the transparent adhesive member 50 is disposed on the print layer 40 in the back view, and the peripheral edge 401 of the print layer 40, the open end 41 and the open end 42. Between the two.
  • the plurality of display panels 10 are bonded to the first main surface 30a to which the transparent adhesive member 50 is bonded in the front protective plate 30.
  • the two display panels 10 are bonded to the two planar surfaces 30a1 and 30a2 by one transparent adhesive member 50.
  • the bonding is performed by aligning the two display panels 10 and the two surfaces 30a1 and 30a2 to which the transparent adhesive member 50 is bonded in a low pressure environment of about 100 Pascals, and applying the pressure of about 1 MegaPascal. I stuck together.
  • step 2 a structure in which the display panel 10 and the front protective plate 30 are bonded together is obtained (step 2).
  • the degree of vacuum and the pressure at the time of bonding are not particularly limited, and the pressure is determined according to, for example, the performance of the apparatus to be used and the processing time, the size of the display panel 10 and the front protective plate 30 to be bonded. It is decided appropriately.
  • the pressing time and the pressure change during pressing are, for example, the performance of the apparatus to be used and the processing time, the display panel 10 to be bonded, and the front protective plate 30. It is determined appropriately according to the size.
  • the display panels 10 may be bonded one by one.
  • the method of bonding there is no particular limitation on the method of bonding, and for example, a method of bonding the display panel 10 to the front protective plate 30 by warping the front protective plate 30 in the atmosphere while aligning can be used.
  • a method of bonding the display panel 10 to the front protective plate 30 by warping the front protective plate 30 in the atmosphere while aligning can be used.
  • the transparent adhesive member 50 may be deformed when pasting while the front protective plate 30 is warped, a method of pasting in a low pressure environment is preferable.
  • the pressure defoaming treatment is not necessary when bubbles do not remain after bonding, but bubbles may or may not come out due to manufacturing errors, so whether or not bubbles remain, It is preferable to perform a pressure defoaming treatment for the stability of production.
  • a pressure defoaming treatment for example, a process of heating at 50 ° C. was performed for about 30 minutes while pressurizing to 5 MPa.
  • the pressure defoaming treatment conditions are not particularly limited, and are appropriately determined according to the flexibility of the transparent adhesive member 50, the sizes of the display panel 10 and the front protective plate 30, and the like.
  • the transparent adhesive member 50 is fully cured by irradiating from the second main surface 30 b side of the front protective plate 30 with ultraviolet light 60 having an integrated light quantity of 3 joules / square centimeter. Then, after the main curing, the side surface of the transparent adhesive member 50 is irradiated with ultraviolet light having an integrated light quantity of 3 Joules / square centimeter as described above, and is not cured by being blocked by the printing layer 40 during the main curing. The part is also cured (step 3). In addition, ultraviolet irradiation is not implemented when the adhesive sheet which is not semi-curable is used for the transparent adhesive member 50, or when a thermosetting adhesive sheet or a transparent adhesive resin is used.
  • the irradiation of the ultraviolet light to the side surface of the transparent adhesive member 50 is carried out when a transparent adhesive of a type that cures even if the printing layer 40 is present at the time of main curing is used for the transparent adhesive member 50. It does not have to be.
  • the order of the irradiation of the ultraviolet light for the main curing and the irradiation of the ultraviolet light to the side surface of the transparent adhesive member 50 may be switched.
  • the liquid crystal display device 100 shown in FIGS. 1 and 2 is completed.
  • the display state of the liquid crystal display device 100 according to the first embodiment thus manufactured and the display state of a liquid crystal display device related thereto (hereinafter referred to as “related liquid crystal display device”) were compared and evaluated.
  • FIG. 8 is a cross-sectional view showing the configuration of the related liquid crystal display device 200.
  • the related liquid crystal display device 200 is different from the liquid crystal display device 100 according to the first embodiment in the shape of the transparent adhesive member 50.
  • the related liquid crystal display device 200 includes two transparent adhesive members 50 that are spaced apart from each other, and one side of each transparent adhesive member 50 is in contact with the printed layer 40 of the bent portion 31 of the front protective plate 30. Are arranged as follows.
  • FIG. 9 shows the direction of travel of the stray light 80 that is the backlight light of the display panel 10 and the external light from the image display surface of the front protective plate 30 (solid line arrows), and the connection, for the related liquid crystal display device 200. It is sectional drawing which shows the advancing direction (broken arrow) of the light 90 corresponding to a certain bright line.
  • FIG. 10 is a cross-sectional view similar to FIG. 9 relating to the liquid crystal display device 100 according to the first embodiment.
  • the stray light 80 reaches the end of the transparent adhesive member 50 in the vicinity of the bent portion 31 of the front protective plate 30, and then is reflected or scattered at the end.
  • the observer reaches 90 as 90.
  • the bright line is easily visually recognized by the observer.
  • one transparent adhesive member 50 is seamlessly attached to the front protective plate 30, and the front protective plate There is no end portion of the front protective plate 30 in the vicinity of the bent portion 31 of the 30. For this reason, it can suppress that an observer visually recognizes a bright line, and can obtain a substantially favorable display quality.
  • the transparent adhesive member 50 is exposed from the outline of the display panel 10 as viewed from the viewpoint 2 side in FIG. If the transparent adhesive member 50 is exposed, dust, foreign matter, and the like may be attached, which may affect long-term reliability.
  • the liquid crystal display device 100 may further include a protective cover 70.
  • the protective cover 70 covers the portion of the transparent adhesive member 50 that is exposed from the outline of the display panel 10 and is in contact with the bent portion 31.
  • the protective cover 70 is a region other than the display image of the display panel 10 in the region covering the vicinity of the bent portion 31 of the front protective plate 30, that is, between the opening end 41 and the opening end 42 of the printing layer 40. Arranged in the area. According to such a protective cover 70, it is possible to suppress dust and foreign matter from adhering to the transparent adhesive member 50.
  • the protective cover 70 may be disposed so that dust, foreign matter, and the like do not adhere to the transparent adhesive member 50, and the material and type thereof are not particularly limited.
  • a general tape such as polyethylene or polyvinyl chloride is used for the protective cover 70, and preferably a black or gray tape is used.
  • the protective cover 70 may also be disposed on the non-light-emitting side of the backlight of the display panel 10.
  • FIG. 12 is a cross-sectional view showing the configuration of the liquid crystal display device according to the second embodiment.
  • components that are the same as or similar to those in the first embodiment are denoted by the same reference numerals, and different components are mainly described.
  • the liquid crystal display device 100 of the second embodiment is different from the liquid crystal display device 100 of the first embodiment in the shape and arrangement of the polarizing plate 20 positioned on the transparent adhesive member 50 side.
  • each of the two display panels 10 adjacent to each other in the display area includes the polarizing plate 20 that is not in contact with each other.
  • the two display panels 10 adjacent to each other in the display area are continuous to each of the adjacent display areas and the area between the adjacent display areas.
  • One polarizing plate 22 is provided.
  • components other than the polarizing plates 21 and 22 in the display panel 10 in a plan view for example, the first substrate or the second substrate of the display panel 10). The same or smaller area is applied.
  • FIGS. 13, FIG. 14, FIG. 16 and FIG. 17 are cross-sectional views showing the manufacturing method.
  • FIG. 15 is a back view of the image display surface of the liquid crystal display device 100 as viewed from the viewpoint 3 of FIG. It is.
  • step 1 While applying a certain pressure using a rubber roller, the transparent adhesive member 50 is attached to the first main surface 30a of the front protective plate 30 as shown in FIG. 13 (step 1).
  • the process up to step 1 is the same as the manufacturing method of the liquid crystal display device 100 according to the first embodiment, and thus detailed description thereof is omitted.
  • one polarizing plate 22 is attached to the transparent adhesive member 50 attached to the first main surface 30a of the front protective plate 30 as shown in FIG. (Step 2).
  • one polarizing plate 22 has no seam and is pasted so as to cover the opening end 41 and the opening end 42 of the printing layer 40. That is, the peripheral portion 221 of the polarizing plate 22 is disposed on the printing layer 40, and in the back view, the peripheral portion 501 of the transparent adhesive member 50, and each of the opening end 41 and the opening end 42 of the printing layer 40. Between the two.
  • step 3 components other than the polarizing plate 22 of the display panel 10 are attached to the polarizing plate 22 attached to the transparent adhesive member 50 with an adhesive (not shown) having a thickness of about 25 ⁇ m.
  • an adhesive not shown
  • step 3 pressure-sensitive adhesives with different flexibility and thickness or laminated pressure-sensitive adhesives are applied as appropriate.
  • the portions other than the polarizing plate 22 of the two display panels 10 and the polarizing plate 22 attached to the transparent adhesive member 50 are aligned. However, they were bonded together at a pressure of about 1 megapascal.
  • the transparent adhesive member 50 is fully cured by irradiating from the second main surface 30 b side of the front protective plate 30 with ultraviolet light 60 having an integrated light amount of 3 joules / square centimeter. Then, after the main curing, the side surface of the transparent adhesive member 50 is irradiated with ultraviolet light having an integrated light quantity of 3 Joules / square centimeter as described above, and is not cured by being blocked by the printing layer 40 during the main curing. The part is also cured (step 4). In addition, ultraviolet irradiation is not implemented when the adhesive sheet which is not semi-curable is used for the transparent adhesive member 50, or when a thermosetting adhesive sheet or a transparent adhesive resin is used.
  • the irradiation of the ultraviolet light to the side surface of the transparent adhesive member 50 is carried out when a transparent adhesive of a type that cures even if the printing layer 40 is present at the time of main curing is used for the transparent adhesive member 50. It does not have to be.
  • the order of the irradiation of the ultraviolet light for the main curing and the irradiation of the ultraviolet light to the side surface of the transparent adhesive member 50 may be switched. Thus, the liquid crystal display device 100 shown in FIG. 12 is completed.
  • the display state of the liquid crystal display device 100 according to the second embodiment thus manufactured and the display state of the related liquid crystal display device 200 shown in FIG. 9 were compared and evaluated.
  • one transparent adhesive member 50 and one polarizing plate 22 are bonded to the front protective plate 30 without a joint (a gap). It is possible to further suppress the bright line from being visually recognized by the observer, and to obtain a generally good display quality.
  • stray light 80 that has passed through the transparent adhesive member 50 and the polarizing plate 22 is generated at the end face of the first substrate or the second substrate of the display panel 10.
  • the intensity of the stray light 80 that has passed through the transparent adhesive member 50 and the polarizing plate 22 indicated by the solid line arrows in FIGS.
  • the total light transmittance of the polarizing plate 22 corresponds to 25 to 50%.
  • FIG. 20 is a cross-sectional view showing the configuration of the liquid crystal display device according to the third embodiment.
  • the same or similar components as those of the first embodiment are denoted by the same reference numerals, and different components will be mainly described.
  • the liquid crystal display device 100 of the third embodiment is different from the liquid crystal display device 100 of the first embodiment in the shape and arrangement of the polarizing plate 20 located on the transparent adhesive member 50 side.
  • each of the two display panels 10 adjacent to each other in the display area includes the polarizing plate 20 that is separated in the area between the adjacent display areas.
  • the two display panels 10 adjacent to each other in the display area include a relatively large polarizing plate 23 in the vicinity of the bent portion 31 of the front protective plate 30. .
  • each of the two display panels 10 adjacent to each other in the display area includes the polarizing plates 23 that are in contact with each other in an area between the adjacent display areas (an area near the bent portion 31).
  • the polarizing plate 23 is formed so as to cover the transparent adhesive member 50 in the vicinity of the bent portion 31 of the front protective plate 30 (the vicinity where the display panel 10 is in contact).
  • the polarizing plate 23 in the display area (not shown), components other than the polarizing plates 21 and 23 in the display panel 10 in plan view (for example, the first substrate or the second substrate of the display panel 10). The same or smaller area is applied.
  • the number of display panels 10 is two, but may be three or more, and it is sufficient that at least two of the plurality of polarizing plates 23 of the plurality of display panels 10 are in contact with each other.
  • the two display panels 10 according to the third embodiment include components other than the polarizing plate 23 of each display panel 10 (for example, the first display panel 10) at a portion corresponding to the bent portion 31 of the front protective plate 30 with which the display panel 10 is in contact.
  • a polarizing plate 23 having a size larger than that of the component is attached so as to protrude from the outline of the first substrate or the second substrate.
  • FIG. 21 is a back view of the image display surface of the liquid crystal display device 100 according to the third embodiment viewed from the viewpoint 4 of FIG. 20 in the direction of the arrow after the step corresponding to the step 2 of the second embodiment.
  • each of the peripheral edge portions 231 of the two polarizing plates 23 is disposed on the printing layer 40, and when viewed from the back, the peripheral edge portion 501 of the transparent adhesive member 50 and the opening end portion of the printing layer 40. 41 and the open end 42.
  • the peripheral edge portions 231 of the two polarizing plates 23 are disposed in the vicinity of the bent portion 31 of the front protective plate 30 and in contact with each other between the opening end portion 41 and the opening end portion 42 of the printing layer 40. ing.
  • the display state of the liquid crystal display device 100 according to the second embodiment thus manufactured and the display state of the related liquid crystal display device 200 shown in FIG. 9 were compared and evaluated.
  • one transparent adhesive member 50 and two polarizing plates 23 that are in contact with each other in the vicinity of the bent portion 31 are connected to the front protective plate 30. Since it is pasted without any gap, it is possible to further suppress the bright line from being visually recognized by the observer, and to obtain a generally good display quality.
  • stray light 80 that has passed through the transparent adhesive member 50 and the polarizing plate 23 is generated at the end face of the first substrate or the second substrate of the display panel 10.
  • the light intensity of the stray light 80 that has passed through the transparent adhesive member 50 and the polarizing plate 23 indicated by solid line arrows in FIGS. Since the amount of light is reduced to about 25 to 50% from the light when the light source is used, the bright line can be made less visible than the related liquid crystal display device 200, and a good display quality can be obtained.
  • the present invention can be freely combined with each embodiment and each modification within the scope of the invention, or can be appropriately modified and omitted with each embodiment and each modification.
  • 10 display panel 10a display surface, 20, 22, 23 polarizing plate, 30 front protective plate, 30a first main surface, 30a1, 30a2 surface, 30b second main surface, 31 bent portion, 50 transparent adhesive member, 70 protective cover , 100 liquid crystal display device.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

La présente invention vise à fournir une technologie permettant d'obtenir une qualité d'affichage satisfaisante avec une structure simple. À cet effet, l'invention concerne un dispositif d'affichage à cristaux liquides comportant: une plaque de protection avant comprenant une première surface principale comprenant une surface cintrée et une seconde surface principale comprenant une surface incurvée; et un élément adhésif transparent qui relie les surfaces d'affichage d'une pluralité de panneaux d'affichage à la première surface principale avec des zones d'affichage sur la surface d'affichage de chaque panneau d'affichage disposées mutuellement adjacentes. La plaque de protection avant comporte un matériau unique. L'élément adhésif transparent est disposé en continu sur chacune des zones d'affichage adjacentes et la partie cintrée sur la surface cintrée entre les zones d'affichage adjacentes.
PCT/JP2017/002699 2016-02-08 2017-01-26 Dispositif d'affichage à cristaux liquides WO2017138364A1 (fr)

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JP2016021446A JP2019056718A (ja) 2016-02-08 2016-02-08 液晶表示装置
JP2016-021446 2016-02-08

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WO2017138364A1 true WO2017138364A1 (fr) 2017-08-17

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Publication number Priority date Publication date Assignee Title
WO2019187735A1 (fr) * 2018-03-29 2019-10-03 ソニー株式会社 Dispositif d'affichage
CN111937057A (zh) * 2018-03-29 2020-11-13 株式会社日本显示器 压接装置及显示装置的制造方法

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JP2005091873A (ja) * 2003-09-18 2005-04-07 Seiko Epson Corp 電気光学装置、電子機器、および電気光学装置の製造方法
JP2005091872A (ja) * 2003-09-18 2005-04-07 Seiko Epson Corp 電気光学装置、電子機器、および電気光学装置の製造方法
JP2006058753A (ja) * 2003-08-22 2006-03-02 Asahi Glass Co Ltd 表示装置及び表示装置の製造方法
JP2007078870A (ja) * 2005-09-12 2007-03-29 Asahi Glass Co Ltd 調光装置
JP2008040277A (ja) * 2006-08-08 2008-02-21 Nippon Zeon Co Ltd 偏光板
JP2015099285A (ja) * 2013-11-20 2015-05-28 日本精機株式会社 表示装置
WO2015190164A1 (fr) * 2014-06-11 2015-12-17 三菱電機株式会社 Dispositif d'affichage à cristaux liquides

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Publication number Priority date Publication date Assignee Title
JP2006058753A (ja) * 2003-08-22 2006-03-02 Asahi Glass Co Ltd 表示装置及び表示装置の製造方法
JP2005091873A (ja) * 2003-09-18 2005-04-07 Seiko Epson Corp 電気光学装置、電子機器、および電気光学装置の製造方法
JP2005091872A (ja) * 2003-09-18 2005-04-07 Seiko Epson Corp 電気光学装置、電子機器、および電気光学装置の製造方法
JP2007078870A (ja) * 2005-09-12 2007-03-29 Asahi Glass Co Ltd 調光装置
JP2008040277A (ja) * 2006-08-08 2008-02-21 Nippon Zeon Co Ltd 偏光板
JP2015099285A (ja) * 2013-11-20 2015-05-28 日本精機株式会社 表示装置
WO2015190164A1 (fr) * 2014-06-11 2015-12-17 三菱電機株式会社 Dispositif d'affichage à cristaux liquides

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019187735A1 (fr) * 2018-03-29 2019-10-03 ソニー株式会社 Dispositif d'affichage
CN111937061A (zh) * 2018-03-29 2020-11-13 索尼公司 显示装置
CN111937057A (zh) * 2018-03-29 2020-11-13 株式会社日本显示器 压接装置及显示装置的制造方法
JPWO2019187735A1 (ja) * 2018-03-29 2021-04-15 ソニー株式会社 表示装置

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