US20100134713A1 - Image Display Device and Production Method Thereof - Google Patents

Image Display Device and Production Method Thereof Download PDF

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Publication number
US20100134713A1
US20100134713A1 US12/452,275 US45227508A US2010134713A1 US 20100134713 A1 US20100134713 A1 US 20100134713A1 US 45227508 A US45227508 A US 45227508A US 2010134713 A1 US2010134713 A1 US 2010134713A1
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United States
Prior art keywords
image display
protective panel
panel
display device
resin composition
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Abandoned
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US12/452,275
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English (en)
Inventor
Tomoyuki Toyoda
Yoshihisa Shinya
Yusuke Kamata
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Dexerials Corp
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Sony Chemical and Information Device Corp
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Assigned to SONY CHEMICAL & INFORMATION DEVICE CORPORATION reassignment SONY CHEMICAL & INFORMATION DEVICE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAMATA, YUSUKE, SHINYA, YOSHIHISA, TOYODA, TOMOYUKI
Publication of US20100134713A1 publication Critical patent/US20100134713A1/en
Assigned to DEXERIALS CORPORATION reassignment DEXERIALS CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SONY CHEMICAL & INFORMATION DEVICE CORPORATION
Abandoned legal-status Critical Current

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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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • 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
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133311—Environmental protection, e.g. against dust or humidity
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/13332—Front frames
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133325—Assembling processes
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133331—Cover glasses
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • G02F2201/503—Arrangements improving the resistance to shock
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/54—Arrangements for reducing warping-twist
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements

Definitions

  • the present invention relates to an image display device having an image display panel such as a liquid crystal display panel, and a method for producing such an image display device. More specifically, the present invention relates to an improved image display device, and production method thereof, in which a cured resin is arranged between an image display panel and a transparent protective panel.
  • a transparent protective panel such as a glass panel or a plastic panel is arranged on the front face of the image display panel. More specifically, for example, the protective panel is mounted inside a case with a slight gap with respect to the image display panel, by arranging a spacer or the like between the image display panel and the protective panel at the peripheral edge of the image display panel.
  • the gap between the image display panel and the protective panel scatters light, resulting in decreased contrast and luminance. This leads to the problem that image quality is harmed. Furthermore, in a configuration in which a gap is present, reflection occurs at the interface between the protective panel and air due to their different refractive indices, which leads to visibility problems, especially outdoors.
  • a spacer is arranged on the periphery of a polarizing plate which is pasted on the surface of a liquid crystal display panel, and a surface protective glass is mounted on an upper portion of the spacer. Furthermore, the surface protective glass is mounted on the liquid crystal display panel by filling an adhesive so that air bubbles do not enter between the polarizing plate and the surface protective glass.
  • Patent Document 2 also describes an image display device in which an image display panel and a protective panel are closely adhered via at least one or more layers of a transparent adhesive material. Patent Document 2 describes that excellent impact resistance can be realized by having a predetermined relationship between the thickness of the transparent adhesive material and the dynamic viscoelastic properties measured based on frequency dispersion.
  • a plastic panel as a protective panel leads to problems with the protective panel warping, which becomes a cause of display quality deterioration.
  • the image display panel is subjected to stresses such as the internal stress generated due to volume shrinkage during the curing of the resin composition, the external stress generated by the plastic panel warping due to changes in the environment temperature, and the residual stress of during molding that the plastic panel itself has.
  • stresses such as the internal stress generated due to volume shrinkage during the curing of the resin composition, the external stress generated by the plastic panel warping due to changes in the environment temperature, and the residual stress of during molding that the plastic panel itself has.
  • the image display panel is a liquid crystal display panel
  • the cell gap of the liquid crystal layer fluctuates in the order of nanometers, which becomes a cause for the occurrence of image unevenness.
  • the size of the protective panel is made larger than the size of the image display panel, and a shielding part is provided on the peripheral portion of the protective panel, in such cases the tendency for image unevenness to occur is pronounced. Furthermore, in extreme cases, the peripheral portion of the protective panel can warp upwards, causing light leakage and the like to occur.
  • the present invention was proposed in consideration of such problems in the conventional art. It is an object of the present invention to provide a configuration of an image display device capable of suppressing warping of a protective panel formed from a plastic as much as possible, and to provide a method for producing the image display device.
  • a first image display device is an image display device comprising an image display panel and a transparent protective panel formed from a plastic which are arranged facing each other via a cured resin, wherein an outer dimension of the protective panel is made larger than an outer dimension of the image display panel, and a peripheral edge of the protective panel is fixed with a fixing jig.
  • a first method for producing an image display device is a method for producing an image display device comprising the steps of arranging an image display panel and a transparent protective panel formed from a plastic to face each other via a resin composition, and curing the resin composition, wherein an outer dimension of the protective panel is made larger than an outer dimension of the image display panel, and the resin composition is cured in a state where a peripheral edge of the protective panel is fixed with a fixing jig.
  • a second image display device is an image display device comprising an image display panel and a transparent protective panel formed from a plastic which are arranged facing each other via a cured resin,
  • an outer dimension of the protective panel is substantially equal to an outer dimension of the image display panel, the outer dimension is equal to an inner dimension of a case of the protective panel and the image display panel, and substantially the whole face of the protective panel is adhered to the image display panel by the cured resin.
  • a second method for producing an image display device is a method for producing an image display device comprising the steps of arranging an image display panel and a transparent protective panel formed from a plastic to face each other via a resin composition, and curing the resin composition, wherein an outer dimension of the protective panel is substantially made equal to an outer dimension of the image display panel, the outer dimension is substantially made equal to an inner dimension of a case of the protective panel and the image display panel, and curing the resin composition in the case in a state where substantially the whole face of the protective panel is in contact with the resin composition.
  • an outer dimension of the protective panel is larger than an outer dimension of the image display panel” refers to the image display panel being included within the protective panel when in a plan view the protective panel and the image display panel are superimposed.
  • the resin composition is cured by UV-ray irradiation in a state where the peripheral edge of the protective panel is fixed using a fixing jig, and the peripheral edge is also fixed with the fixing jig even after the curing. Consequently, the resin composition can be cured in a state where warping of the protective panel is corrected, and a state in which the protective panel is not warped can be maintained.
  • the focus is on the size of the protective panel, the size of the image display panel, and the size of the case thereof.
  • the resin composition is cured in a state where the outer dimension of the protective panel, the outer dimension of the image display panel, and the inner dimension of the case thereof are made substantially equal. Then, the resin composition is cured in a state where substantially the whole face of the protective panel is in contact with the resin composition. Consequently, the resin curing are not carried out in a state where the peripheral edge of the protective panel is open.
  • the conventional art completely fails to describe the idea of suppressing the occurrence of warping in the protective panel by making the outer dimension of the protective panel, the outer dimension of the image display panel, and the inner dimension of the case thereof substantially equal.
  • a surface protection glass is used, and absolutely no consideration is given to warping of a plastic panel.
  • the invention of Patent Document 2 is directed to an image display device having a comparatively large screen of about 32 to 100 inches. Since the size of the protective panel is smaller than the size of the display panel, and the configuration is different from that of the present invention, the protection configuration of the image display panel cannot be produced by the simple operation of just superimposing the protective panel and the image display panel via the resin composition and fitting the resultant structure in the case.
  • the protective panel is formed from a plastic, warping of the protective panel can be reliably suppressed, and a highly reliable image display can be obtained in which image unevenness and the like do not occur. Furthermore, according to the method for producing an image display device according to the present invention, such an image display device can be provided.
  • the present invention since a cured resin is arranged between the protective panel and the image display panel, advantageous effects from such configuration can also be obtained. For example, reflection at the interface with the protective panel can be suppressed, and sufficient outdoor visibility can also be ensured.
  • the cured resin is arranged between the protective panel and the image display panel, compared with when a gap is provided between these panels, sufficient impact resistance and the like can be ensured even if the clearance between the protective panel and the image display panel is thin. Therefore, the present invention is also useful in making the device thinner.
  • FIG. 1 is a schematic diagram of a panel configuration of a liquid crystal display device according to an embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional diagram illustrating a pasting step of a protective panel according to the embodiment illustrated in FIG. 1 .
  • FIG. 3 is a schematic diagram of a panel configuration of a liquid crystal display device according to another embodiment of the present invention.
  • FIG. 4 is a schematic cross-sectional diagram illustrating a pasting step of a protective panel according to the embodiment illustrated in FIG. 3 .
  • FIG. 5 is a schematic cross-sectional diagram illustrating a pasting step of a protective panel in a liquid crystal display device according to another embodiment of the present invention.
  • FIG. 6 is a schematic cross-sectional diagram illustrating warping of a protective panel.
  • FIG. 1 is a schematic diagram of a panel configuration of a liquid crystal display device according to an embodiment of a first aspect of the present invention.
  • This liquid crystal display device is used in a mobile phone, a portable game device or the like.
  • the liquid crystal display device includes a liquid crystal display panel 1 for displaying images and a protective panel 2 for protecting the surface of the liquid crystal display panel 1 .
  • the liquid crystal display panel 1 and the protective panel 2 are arranged facing each other via a cured resin 3 . Furthermore, the liquid crystal display panel 1 and protective panel 2 are respectively adhered with substantially the whole face of the surface or the back face of the cured resin 3 . Consequently, the liquid crystal display device has improved visibility and impact resistance.
  • a liquid crystal layer LC is formed such that a liquid crystal material is sandwiched between a pair of substrates 11 and 12 . Images are displayed by controlling the orientation of the liquid crystal material in this liquid crystal layer LC. More specifically, provided on the pair of substrates 11 and 12 are a not-illustrated color filter and black matrix, pixel electrodes and counter electrodes, as well as drive transistors and the like. A polarizing plate is pasted on the surface and back face of the pair of substrates 11 and 12 . Image display is performed by controlling the drive of each pixel by an active matrix system, for example. A gap g between the pair of substrates 11 and 12 is a so-called cell gap.
  • a shielding part 2 a is formed on the peripheral edge of the protective panel 2 .
  • the outer dimension W 2 of the protective panel 2 which includes the shielding part 2 a , is slightly larger than the outer dimension W 1 of the liquid crystal display panel 1 , so that the shielding part 2 a protrudes towards the exterior side from the interior side of the peripheral edge of the liquid crystal display panel 1 . Light leakage from the peripheral portion of the liquid crystal display panel 1 can be reliably shielded by the shielding part 2 a.
  • the peripheral edge of the protective panel 2 protrudes from the peripheral edge of the liquid crystal display panel 1
  • the resin composition is simply arranged between these panels, and the protective panel 2 and the liquid crystal display panel 1 are pasted by curing the resin composition, as illustrated in FIG. 6
  • the cured resin 3 warps upwards especially at the peripheral portion of the protective panel 2 due to the internal stress (arrow A) generated during the curing of the resin composition and the external stress (arrow B) generated on the peripheral portion when the protective panel 2 warps due to changes in the environment temperature. Consequently, these stresses are applied on the upper face of the liquid crystal display panel 1 .
  • the gap g between the substrates 11 and 12 of the liquid crystal display panel 1 fluctuates in the order of nanometers between the center portion and the peripheral portion, for example, which may cause image unevenness to occur.
  • the curing of the resin composition is carried out in a state where the upper face of the shielding part 2 a of the protective panel 2 (i.e., the face of the protective panel 2 on the opposite side of the liquid crystal display panel 1 ) is held on the liquid crystal display panel 1 side by a fixing jig 5 .
  • the upper face of the shielding part 2 a continues to be held and fixed with the fixing jig 5 . Therefore, according to the present embodiment, the peripheral edge of the protective panel 2 can be maintained in a state free from warping. A method for pasting the protective panel according to the present embodiment will now be described.
  • FIG. 2 illustrates the pasting step of the protective panel 2 in the method for producing the liquid crystal display device of the present embodiment.
  • a resin composition 4 is coated between the liquid crystal display panel 1 and the protective panel 2 .
  • the resin composition 4 may be coated on the upper face of the liquid crystal display panel 1 and the protective panel 2 is then superimposed thereon.
  • the resin composition 4 may also be coated on the protective panel 2 side, and then the protective panel 2 is flipped over and is superimposed on the liquid crystal display panel 1 .
  • the resin composition 4 to be used may include thermosetting and photocurable (for example, UV-ray curable) resin compositions. However, from the perspective of avoiding a high-temperature state during curing as much as possible, it is preferred to use a UV-ray curable or similar photocurable resin composition. In the present embodiment, a UV-ray curable resin composition is used as the resin composition 4 .
  • the resin composition 4 is prepared so as to have a curing shrinkage ratio of preferably 5% or less, more preferably 4.5% or less, even more preferably 4.0% or less, and most preferably 0 to 2%. By doing so, the internal stress that builds up in the cured resin 3 during curing of the resin composition 4 can be reduced, and the generation of distortion at the interface between the cured resin 3 and the liquid crystal display panel 1 , or at the interface between the cured resin 3 and the protective panel 2 , can be prevented.
  • the resin composition 4 is prepared so that the storage modulus (25° C.) of the cured resin 3 is preferably 1 ⁇ 10 7 Pa or less, and more preferably of 1 ⁇ 10 3 Pa to 1 ⁇ 10 6 Pa. By doing so, the stress that is applied on the liquid crystal display panel 1 after the curing of the resin composition 4 can be reduced.
  • the magnitude of the internal stress that builds up in the cured resin 3 during curing of the resin composition 4 can be evaluated based on the average surface roughness of the cured resin obtained by dropping the resin composition onto a flat plate and curing the dropped resin composition.
  • the distortion generated at the interface with the liquid crystal display panel 1 and the protective panel 2 can be ignored if, for example, a cured resin has an average surface roughness of 6.0 nm or less, preferably 5.0 nm or less, and more preferably from 1 to 3 nm.
  • the cured resin can be obtained by dropping 2 mg of the resin composition onto a glass plate forming the substrate of a liquid crystal display panel or an acrylic plate forming a protective panel and curing the resin composition by UV-ray irradiation to a 90% or higher cure ratio.
  • the average surface roughness of the glass plate or the acrylic plate is usually 1.0 nm or less. Therefore, the resin composition 4 used in the present invention is a resin composition which when dropped onto the glass plate or acrylic plate forming the substrate of a liquid crystal display panel and then cured, yields a cured resin having an average surface roughness in the above-described range.
  • the resin composition 4 also has to have excellent optical properties.
  • the refractive index it is preferred that the refractive index of the cured resin 3 formed by curing the resin composition 4 and the refractive indices of the liquid crystal display panel 1 and the protective panel 2 are equal.
  • the refractive index (nD) is 1.49 to 1.50, and if the substrate is formed from hardened glass, the refractive index is about 1.55.
  • the protective panel 2 is formed from an acrylic resin, this refractive index (nD) is 1.51 to 1.52.
  • the refractive index (nD) of the cured resin 3 is preferably 1.45 or more to 1.55 or less, and more preferably 1.51 or more to 1.52 or less.
  • the transmittance of light in the visible wavelength region is preferably 90% or higher.
  • resin compositions which satisfy the above conditions include a resin composition containing at least one kind of polymer selected from a polyurethane acrylate, a polyisoprene-based acrylate or an ester thereof, a hydrogenated terpene resin, a butadiene polymer and the like; at least one kind of acrylate monomer selected from isobornyl acrylate, dicyclopentenyl oxyethyl methacrylate, 2-hydroxybutyl methacrylate and the like; and a photopolymerization initiator such as 1-hydroxycyclohexyl-phenyl-ketone.
  • the kind and proportion of the polymer and the acrylate monomer are adjusted so that the values for the curing shrinkage ratio, storage modulus, and optical properties fall within the above-described ranges.
  • the protective panel 2 is often provided with a function for cutting light in the UV region to protect the liquid crystal display panel 1 against UV rays. Therefore, it is preferred to combine the photopolymerization initiator with a photopolymerization initiator that can cure even in the visible region (for example, trade name: SpeedCure TPO, manufactured by Nihon SiberHegner KK).
  • a spacer is formed on the periphery of the liquid crystal display panel 1 , for example, before the coating of the resin composition 4 is carried out. Obviously, the spacer may be omitted.
  • the thickness of the coated resin composition 4 is arbitrary, preferably the coating is carried out so that the layer thickness of the cured resin 3 will be about 50 ⁇ m to 200 ⁇ m.
  • the protective panel 2 is a transparent panel made of a plastic.
  • an acrylic resin panel or the like, such as a polymethyl methacrylate panel may be used.
  • the protective panel 2 has on its peripheral edge a shielding part 2 a which shields light.
  • the shielding part 2 a may be formed by pasting a light-shielding tape or by printing a light-shielding coating.
  • the outer dimension of the protective panel 2 is larger than the outer dimension of the liquid crystal display panel 1 . Therefore, when these panels are superimposed, the peripheral edge of the protective panel 2 protrudes from the peripheral edge of the liquid crystal display panel 1 . If the joining with the protective panel 2 is carried out by simply irradiating UV rays in this state to cure the resin composition 4 , the problem of warping of the protective panel 2 arises. Thus, in the present embodiment, as illustrated in FIG. 2 , the resin composition 4 is cured in a state where the peripheral edge of the protective panel 2 is fixed using the fixing jig 5 so as to be held from the upper face of the protective panel 2 .
  • the fixing jig 5 may have, for example, a frame shape capable of housing in its interior the liquid crystal display panel 1 and the protective panel 2 , in which the upper end portion is folded over to form an eaves-shaped holding part 5 a.
  • the resin composition 4 is cured by UV-ray irradiation in a state where the upper face of the peripheral edge of the protective panel 2 , which serves as the shielding part 2 a , is held by this holding part 5 a. Consequently, since the curing of the resin composition 4 is carried out in a state in which the warping of the protective panel 2 is corrected, the flatness of the protective panel 2 is maintained.
  • the protective panel 2 is exposed to heat rays.
  • the shielding part 2 a is fixed with the holding part 5 a, the warping will not expand even if the protective panel 2 becomes hot.
  • the fixing jig 5 may be a dedicated jig used only during the curing of the resin composition 4
  • the case housing the liquid crystal display panel 1 on which the protective panel 2 is pasted may also be used for this purpose.
  • the above-described held state can be obtained by forming the eaves-shaped holding part 5 a in the case of the liquid crystal display device into which the liquid crystal display panel 1 and the like is to be mounted, and mounting the liquid crystal display panel 1 in the case.
  • the case can be used as is, and the mounting of the liquid crystal display panel 1 is completed simultaneously with the completion of the curing of the resin composition 4 .
  • the liquid crystal display device has the exact same structure as the state illustrated in FIG. 2 .
  • the upper face of the protective panel 2 continues to be supported and fixed with the case even after the curing of the resin composition 4 , whereby the warping of the protective panel 2 over time can also be prevented.
  • the thus-produced liquid crystal display device is a highly reliable liquid crystal display device in which warping of the protective panel 2 is reliably suppressed, and display unevenness and the like does not occur. Furthermore, since the cured resin 3 is filled between the protective panel 2 and the liquid crystal display panel 1 , outdoor visibility can be sufficiently ensured, and impact resistance can also be ensured.
  • FIG. 3 is a schematic diagram of a panel configuration of an image display device according to another embodiment of the first aspect of the present invention.
  • This image display device differs from the image display device illustrated in FIG. 1 in that the lower face of the peripheral edge of the protective panel 2 formed from a plastic, that is, the face on the liquid crystal display panel 1 side of the protective panel 2 , is adhered and fixed to the upper end face of a fixing jig 6 .
  • Other features are formed in the same manner as the image display device illustrated in FIG. 1 .
  • the pasting method of the protective panel 2 in this embodiment is, similar to as described above, to coat the liquid crystal display panel 1 with the resin composition 4 and then superimpose the protective panel 2 over the liquid crystal display panel 1 with the resin composition 4 interposed therebetween.
  • a frame-shaped fixing jig 6 having roughly the same outer dimension as the protective panel 2 is used.
  • the peripheral edge of the protective panel 2 is fixed with the upper end face of this fixing jig 6 .
  • the protective panel 2 is adhesively fixed by pasting an adhesive tape 7 on the upper end face of the fixing jig 6 . If the resin composition 4 is cured by carrying out the UV-ray irradiation in this state, similar to in the embodiment of FIG. 1 , the warping of the protective panel 2 can be reliably suppressed.
  • the fixing jig 6 may be a dedicated jig used only during the curing of the resin composition 4 , or the case housing the liquid crystal display panel 1 may also be used for this purpose. In the latter case, the liquid crystal display device has the exact same structure as the state illustrated in FIG. 3 .
  • FIG. 5 is a schematic diagram of a method for producing a panel configuration of a liquid crystal display device according to an embodiment of a second aspect of the present invention.
  • the present embodiment is characterized in that the outer dimension of the protective panel 2 is made substantially the same as the outer dimension of the liquid crystal display panel 1 , the outer dimensions of these panels are made substantially the same as the inner dimension of the case 8 thereof, and the curing of the resin composition 4 is carried out in a state where the resin composition 4 is in contact with substantially the whole surface of the protective panel 2 .
  • the method is the same as that of the above embodiments according to the first aspect of the present invention as far as the coating of the resin composition 4 . Thus, such a description is omitted here.
  • the protective panel 2 is superimposed thereon.
  • the outer dimension of the protective panel 2 is made substantially the same as the outer dimension of the liquid crystal display panel 1 . Consequently, the whole face of the protective panel 2 contacts the resin composition 4 , and is in a so-called “warping margin-less” state.
  • the liquid crystal display panel 1 and the protective panel 2 are housed in the case 8 .
  • the inner dimension of the case 8 is set to be substantially the same as the outer dimension of the protective panel 2 and the liquid crystal display panel 1 , and so that the protective panel 2 superimposed on the liquid crystal display panel 1 fits precisely in the case 8 .
  • the shielding part has to be separately provided.
  • the present invention is obviously not limited to those embodiments.
  • Various modifications may be made to the embodiments discussed above without departing from the scope of the present invention.
  • the shielding part may be omitted on the peripheral edge of the protective panel.
  • the present invention may also be applied in a device other than a liquid crystal display device.
  • the present invention may also be applied in an organic EL display device, a plasma display and the like.
  • a protective panel was pasted on a liquid crystal display panel according to the method illustrated in FIG. 2 to produce a liquid crystal display device.
  • the used protective panel was a transparent plastic panel formed from polymethyl methacrylate (PMMA).
  • a case housing the liquid crystal display panel was used as a fixing jig.
  • An upper face of a light shielding part formed on a peripheral edge of the protective panel was held and fixed with forming an eaves-shaped holding part on this case.
  • the resin composition to be arranged between the liquid crystal display panel and the protective panel was prepared by kneading in a kneader 70 parts by weight of an ester compound formed from a maleic anhydride adduct of a polyisoprene polymer and 2-hydroxyethyl methacrylate, 30 parts by weight of dicyclopentenyl oxyethyl methacrylate, 10 parts by weight of 2-hydroxybutyl methacrylate, 30 parts by weight of a hydrogenated terpene resin, 140 parts by weight of a butadiene polymer, 4 parts by weight of a photopolymerization initiator, and 0.5 parts by weight of a visible region photopolymerization initiator.
  • the curing shrinkage ratio of this resin composition was 1.8%, and the storage modulus (25° C.) of the cured resin obtained by curing this resin composition was 1 ⁇ 10 4 Pa. Furthermore, the average surface roughness of the cured resin obtained by dropping 2 mg of the resin composition onto a glass plate for a liquid crystal cell, and curing the resin composition by UV-ray irradiation at a cure ratio of 90% or higher, was 2.7 nm. In addition, the transmittance in the visible region of a 100 ⁇ m-thick cured resin formed from the above resin composition was measured by a UV-Visible Spectrophotometer (model name: V-560, manufactured by JASCO Corporation) to be 90% or higher.
  • the elastic modulus (Pa) 25° C. was measured at a measurement frequency of 1 Hz using a viscoelastometer (model name: DMS6100, manufactured by Seiko Instruments Inc.).
  • the curing shrinkage ratio was determined by measuring the specific gravities of the uncured resin solution and the cured solid using an electronic densimeter (model name: SD-120L, manufactured by Mirage), and calculating the difference between them from the following equation.
  • Curing shrinkage ratio (%) (Cured product specific gravity ⁇ Resin solution specific gravity)/Cured product specific gravity ⁇ 100
  • the average surface roughness was determined by measuring the distortion (Ra: average surface roughness) in a given region (2.93 mm ⁇ 2.20 mm) of a glass plate surface using a three-dimensional non-contact surface roughness meter manufactured by Zygo Corporation.
  • a liquid crystal display device could be obtained which had hardly any warping of the protective panel, no display unevenness, and excellent outdoor visibility and impact resistance.
  • a liquid crystal display device was produced in the same manner as in Example 1, except that the resin composition to be arranged between the liquid crystal display panel and the protective panel was changed as follows. In the present example too, a liquid crystal display device could be obtained which had hardly any warping of the protective panel, no display unevenness, and excellent outdoor visibility and impact resistance.
  • the resin composition in the present example was prepared by kneading in a kneader 100 parts by weight of an ester compound formed from a maleic anhydride adduct of a polyisoprene polymer and 2-hydroxyethyl methacrylate, 30 parts by weight of dicyclopentenyl oxyethyl methacrylate, 10 parts by weight of 2-hydroxybutyl methacrylate, 30 parts by weight of a hydrogenated terpene resin, 210 parts by weight of a butadiene polymer, 7 parts by weight of a photopolymerization initiator, and 1.5 parts by weight of a visible region photopolymerization initiator.
  • the curing shrinkage ratio of this resin composition was 1.0%, and the storage modulus (25° C.) of a cured resin obtained by curing this resin composition was 4 ⁇ 10 3 Pa. Furthermore, the average surface roughness of the cured resin obtained by dropping 2 mg of the resin composition onto a glass plate for a liquid crystal cell, and curing the resin composition by UV-ray irradiation at a cure ratio of 90% or higher, was 1.5 nm. In addition, the transmittance in the visible region of a 100 ⁇ m-thick cured resin formed from this resin composition was measured by a UV-Visible Spectrophotometer (model name: V-560, manufactured by JASCO Corporation) to be 90% or higher.
  • a liquid crystal display device was produced in the same manner as in Example 1, except that the resin composition to be arranged between the liquid crystal display panel and the protective panel was changed as follows. In the present example too, a liquid crystal display device could be obtained which had hardly any warping of the protective panel, no display unevenness, and excellent outdoor visibility and impact resistance.
  • the resin composition in the present example was prepared by kneading in a kneader 70 parts by weight of an ester compound formed from a maleic anhydride adduct of a polyisoprene polymer and 2-hydroxyethyl methacrylate (trade name: UC-203, manufactured by Kuraray Co., Ltd.), 30 parts by weight of dicyclopentenyl oxyethyl methacrylate (trade name: FA512M, manufactured by Hitachi Chemical Co., Ltd.), 10 parts by weight of 2-hydroxybutyl methacrylate (trade name: Light Ester HOB, manufactured by Kyoeisha Chemical Co., Ltd.), 30 parts by weight of a hydrogenated terpene resin (trade name: Clearon P-85, manufactured by Yasuhara Chemical Co., Ltd.), 35 parts by weight of a butadiene polymer (trade name: Polyoil 110, manufactured by Zeon Corporation), 5 parts by weight of a photopolymerization initiator trade name Irg
  • the curing shrinkage ratio of this resin composition was 3.8%, and the storage modulus (25° C.) of a cured resin obtained by curing this resin composition was 4 ⁇ 10 5 Pa. Furthermore, the average surface roughness of the cured resin obtained by dropping 2 mg of the resin composition onto a glass plate for a liquid crystal cell, and curing the resin composition by UV-ray irradiation at a cure ratio of 90% or higher, was 5.0 nm. In addition, the transmittance in the visible region of a 100 ⁇ m-thick cured resin formed from this resin composition was measured by a UV-Visible Spectrophotometer (model name: V-560, manufactured by JASCO Corporation) to be 90% or higher.
  • a liquid crystal display device was produced using the same protective panel as in Example 1, by pasting the protective panel on the liquid crystal display panel according to the method illustrated in FIG. 3 .
  • the used resin composition was also the same as that in Example 1.
  • a liquid crystal display device could be obtained which had hardly any warping of the protective panel, no display unevenness, and excellent outdoor visibility and impact resistance.
  • a liquid crystal display device was produced using the same protective panel as in Example 1, by pasting the protective panel on the liquid crystal display panel according to the method illustrated in FIG. 3 .
  • the used resin composition was the same as that in Example 2.
  • a liquid crystal display device could be obtained which had hardly any warping of the protective panel, no display unevenness, and excellent outdoor visibility and impact resistance.
  • a liquid crystal display device was produced using the same protective panel as in Example 1, by pasting the protective panel on the liquid crystal display panel according to the method illustrated in FIG. 3 .
  • the used resin composition was the same as that in Example 3.
  • a liquid crystal display device could be obtained which had hardly any warping of the protective panel, no display unevenness, and excellent outdoor visibility and impact resistance.
  • a liquid crystal display device was produced using the same protective panel as in Example 1, by carrying out the resin curing during the pasting of the protective panel according to the method illustrated in FIG. 5 .
  • the used resin composition was the same as that in Example 1.
  • a liquid crystal display device could be obtained which had hardly any warping of the protective panel, no display unevenness, and excellent outdoor visibility and impact resistance.
  • a liquid crystal display device was produced using the same protective panel as in Example 1, by carrying out the resin curing during the pasting of the protective panel according to the method illustrated in FIG. 5 .
  • the used resin composition was the same as that in Example 2.
  • a liquid crystal display device could be obtained which had hardly any warping of the protective panel, no display unevenness, and excellent outdoor visibility and impact resistance.
  • a liquid crystal display device was produced using the same protective panel as in Example 1, by carrying out the resin curing during the pasting of the protective panel according to the method illustrated in FIG. 5 .
  • the used resin composition was the same as that in Example 3.
  • a liquid crystal display device could be obtained which had hardly any warping of the protective panel, no display unevenness, and excellent outdoor visibility and impact resistance.
US12/452,275 2007-07-17 2008-07-16 Image Display Device and Production Method Thereof Abandoned US20100134713A1 (en)

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