WO2019009145A1 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

Info

Publication number
WO2019009145A1
WO2019009145A1 PCT/JP2018/024264 JP2018024264W WO2019009145A1 WO 2019009145 A1 WO2019009145 A1 WO 2019009145A1 JP 2018024264 W JP2018024264 W JP 2018024264W WO 2019009145 A1 WO2019009145 A1 WO 2019009145A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical compensation
compensation layer
liquid crystal
polarizer
display device
Prior art date
Application number
PCT/JP2018/024264
Other languages
English (en)
Japanese (ja)
Inventor
健治 藤田
全亮 齊藤
隆行 夏目
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2019009145A1 publication Critical patent/WO2019009145A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation

Definitions

  • the present invention relates to a liquid crystal display device. More specifically, the present invention relates to a liquid crystal display device suitable for a liquid crystal display device in a vertical alignment mode provided with a pair of circularly polarizing plates.
  • a liquid crystal display device generally includes a pair of linear polarizing plates as polarizing plates and a liquid crystal cell provided between the pair of linear polarizing plates, and various types such as vertical alignment (VA) mode and horizontal alignment mode. Display modes have been developed.
  • VA vertical alignment
  • a VA mode liquid crystal display device using a pair of circularly polarizing plates instead of a pair of linear polarizing plates as a polarizing plate has been developed.
  • a circularly polarizing plate is typically constituted by a combination of a linear polarizing plate and a ⁇ / 4 retardation plate.
  • a VA mode liquid crystal display device using a pair of circularly polarizing plates is also referred to as a VA circularly polarizing panel.
  • the VA circularly polarizing panel has room for improvement in that the contrast ratio at an oblique viewing angle is low and a sufficient viewing angle characteristic can not be obtained.
  • various techniques for improving the viewing angle characteristics using an optical compensation film have been proposed.
  • a pair of polarizers consisting of polarizer A and polarizer B and a pair of polarizers are disclosed.
  • the liquid crystal display device is provided with a liquid crystal cell of the vertical alignment type disposed in the above, and Nz represented by the following formula (1) between the liquid crystal cell and the polarizer A and between the liquid crystal cell and the polarizer B: Retarders each having a value of more than 2.0, and the in-plane slow axis of the quarter-wave retarder has a positional relationship of approximately 45 ° with the transmission axis of the adjacent polarizer, At least one of A and the adjacent 1 ⁇ 4 ⁇ retardation plate and / or between the polarizer B and the adjacent 1 ⁇ 4 ⁇ retardation plate comprises a material layer having a negative intrinsic birefringence value, And the in-plane slow axis is in a positional relationship substantially parallel or nearly orthogonal to the absorption
  • the first polarizer functions as a first polarizer and a ⁇ / 4 plate as a liquid crystal display device in which light leakage in an oblique direction is suppressed in the circular polarization mode and a viewing angle is accurately compensated.
  • a liquid crystal cell, a second optical compensation layer functioning as a ⁇ / 4 plate, a third optical compensation layer having a refractive index relationship of nz>nx> ny, and a second polarizer Of the first optical compensation layer and the second optical compensation layer, with the retardation wavelength dispersion value (Re cell [450] / Re cell [550]) of the liquid crystal cell as ⁇ cell.
  • the ⁇ ⁇ / 4 / ⁇ cell is 0.95 to 1.02.
  • a liquid crystal display device having a liquid crystal panel is disclosed.
  • the circular polarizer structure constituting the liquid crystal display element is the first for its optical compensation.
  • the circular analyzer structure has an anisotropy of refractive index nx ny ny ⁇ between the second polarizing plate and the second retardation plate for optical compensation.
  • variable retarder structure includes the uniaxial sixth retardation plate and the eighth retardation plate with nz and the uniaxial seventh retardation plate with the refractive index anisotropy of nx> ny ⁇ nz
  • a liquid crystal display device comprising a ninth retardation plate having a refractive index anisotropy of nxnxny> nz between the first retardation plate and the second retardation plate for compensation It has been disclosed.
  • Patent Document 4 wide viewing angle compensation can be performed on a liquid crystal cell, and circularly polarized light of a wide band can be obtained, which contributes to thinning, prevents thermal unevenness, and leaks light in black display.
  • the retardation Rth 2 in the thickness direction is 30 to 400 nm
  • the angle between the absorption axis of the polarizer and the slow axis of the first optical compensation layer is “+” or “ ⁇ ” 25 to 65 °
  • a polarizing plate with an optical compensation layer is disclosed.
  • Patent Document 5 as a liquid crystal display device which can be manufactured at low cost and simply and which can realize a high contrast ratio in a wide viewing angle range, a first polarizer, a first birefringence, and the like are disclosed.
  • Layer, first ⁇ / 4 plate, liquid crystal cell, second ⁇ / 4 plate, second birefringent layer, and second absorption axis orthogonal to absorption axis of first polarizer A liquid crystal display device having a polarizer in this order, wherein the first birefringent layer satisfies Nz> 0.9, and the in-plane slow axis is orthogonal to the absorption axis of the first polarizer, In the first ⁇ / 4 plate, the in-plane slow axis forms an angle of about 45 ° with the absorption axis of the first polarizer, and the liquid crystal cell makes liquid crystal molecules in the liquid crystal cell perpendicular to the substrate surface
  • the second ⁇ / 4 plate has the in-plane
  • Patent Document 6 discloses that a long polymer film continuously supplied is conveyed while being held at both ends.
  • a method for producing a retardation film which transports a molecular film while stretching it in a transverse direction orthogonal to the transport direction, in which the polymer film is stretched in the transverse direction with the polymer film slackened in the transport direction.
  • a method of making a retardation film is disclosed.
  • the characteristic change of the optical compensation layer is large in an environment such as a low temperature, a high temperature, a high temperature and high humidity environment, and a drop in display quality such as a drop in contrast or display unevenness may occur.
  • a solvent adheres to the polarizing plate peeling of the optical compensation layer from the polarizer and breakage of the optical compensation layer may occur.
  • the thickness of the polarizing plate becomes large and it is not suitable for mobile applications.
  • a third optical compensation layer having a refractive index relationship of nz> nx> ny is used, but such an optical compensation layer has a viewing angle improving effect.
  • the required optical parameters are narrow and the materials and processes that can be selected are limited. Furthermore, when materials that can be mass-produced are selected from the viewpoint of cost and production tact, the occurrence of the problems as described in (1) to (3) above can not be avoided.
  • the liquid crystal display element of patent document 3 uses many retardation plates for optical compensation, when the number of optical compensation layers increases, the thickness of the liquid crystal panel containing a polarizing plate becomes like said (3). With the increase, the manufacturing cost will increase.
  • the present invention has been made in view of the above-mentioned present situation, and can suppress deterioration of display quality even under severe environment, can suppress peeling and breakage at the time of solvent adhesion to a polarizing plate, and liquid crystal
  • An object of the present invention is to provide a liquid crystal display device capable of thinning a panel.
  • the inventors of the present invention can suppress deterioration in display quality even under severe environments, can suppress peeling and breakage at the time of solvent adhesion to a polarizing plate, and can make a liquid crystal panel thinner.
  • the first optical compensation layer having an in-plane retardation Re of 15 nm or less and a thickness direction retardation Rth of ⁇ 60 nm or less, and Two layers with a second optical compensation layer having an internal retardation Re of 40 to 120 nm and satisfying 1 ⁇ Nz ⁇ 4 are provided, and the in-plane slow axis of the second optical compensation layer is a liquid crystal cell.
  • the first polarizer, the first optical compensation layer, the second optical compensation layer, and the third optical compensation layer functioning as a ⁇ / 4 retardation plate are opposed to each other.
  • a liquid crystal cell including a pair of substrates and a liquid crystal layer between the pair of substrates, a fourth optical compensation layer functioning as a ⁇ / 4 retardation plate, and a second polarizer in this order;
  • the first polarizer has an absorption axis at an angle of substantially 90 ° to the absorption axis of the second polarizer, and the first optical compensation layer has an in-plane retardation Re of 15 nm or less
  • the thickness direction retardation Rth is ⁇ 60 nm or less
  • the second optical compensation layer has an in-plane retardation Re of 40 to 120 nm, satisfies 1 ⁇ Nz ⁇ 4, and an in-plane retardation
  • the phase axis is substantially parallel to the absorption axis of the first polarizer
  • the third optical compensation layer has an in-plan
  • the third and fourth optical compensation layers may each satisfy 1 ⁇ Nz ⁇ 2.4.
  • the liquid crystal display device does not include an optical compensation layer other than the first to third optical compensation layers between the first polarizer and the liquid crystal cell, and the liquid crystal cell and the second polarizer And the optical compensation layer other than the fourth optical compensation layer.
  • the first optical compensation layer has a thickness direction retardation Rth of ⁇ 200 to ⁇ 100 nm
  • the second optical compensation layer has an in-plane retardation Re of 60 to 110 nm, and 1 ⁇ Nz ⁇
  • the third optical compensation layer may satisfy 1.4 ⁇ Nz ⁇ 2.4
  • the fourth optical compensation layer may satisfy 1.4 ⁇ Nz ⁇ 2.4. .
  • the liquid crystal display device has an in-plane retardation Re of 40 to 120 nm, satisfies 1 ⁇ Nz ⁇ 4, and an in-plane slow axis is substantially parallel to the absorption axis of the second polarizer.
  • a fifth optical compensation layer, and a sixth optical compensation layer having an in-plane retardation Re of 15 nm or less and a thickness direction retardation Rth of -60 nm or less, the first polarizer,
  • the layer and the second polarizer may be arranged in this order.
  • the first and sixth optical compensation layers each have a thickness direction retardation Rth of -150 to -80 nm
  • the second and fifth optical compensation layers each have an in-plane retardation Re of 40 to 90 nm and satisfy 1 ⁇ Nz ⁇ 1.4
  • the third optical compensation layer satisfies 1.4 ⁇ Nz ⁇ 2.4
  • the fourth optical compensation layer satisfies 1.4 ⁇ It may satisfy Nz ⁇ 2.4.
  • the liquid crystal display device has a seventh optical compensation layer having an in-plane retardation Re of 15 nm or less, a thickness direction retardation Rth of 50 to 300 nm, and Nz> 1, and an in-plane retardation Re of And an eighth optical compensation layer having a thickness direction retardation Rth of 50 to 300 nm and Nz> 1 and having a thickness of 15 nm or less, the first polarizer, the first optical compensation layer, The second optical compensation layer, the third optical compensation layer, the seventh optical compensation layer, the liquid crystal cell, the eighth optical compensation layer, the fourth optical compensation layer, the fifth optical compensation
  • the layer, the sixth optical compensation layer, and the second polarizer may be arranged in this order.
  • the first and sixth optical compensation layers each have a thickness direction retardation Rth of -150 to -80 nm, and the second and fifth optical compensation layers each have an in-plane retardation Re of 40 to
  • the third and fourth optical compensation layers may be 90 nm and satisfy 1 ⁇ Nz ⁇ 1.4, and each of the third and fourth optical compensation layers may satisfy 1 ⁇ Nz ⁇ 1.4.
  • the in-plane retardation Re of the third optical compensation layer may be substantially the same as the in-plane retardation Re of the fourth optical compensation layer.
  • Each of the third and fourth optical compensation layers may have an in-plane retardation Re of 100 to 175 nm.
  • the present invention it is possible to suppress deterioration in display quality even when placed under a severe environment, to suppress peeling and breakage at the time of solvent adhesion to a polarizing plate, and to reduce the thickness of the liquid crystal panel.
  • the device can be realized.
  • FIG. 1 is a schematic plan view of a liquid crystal display device according to Embodiment 1.
  • FIG. 1 is a schematic cross-sectional view of a liquid crystal display device according to Embodiment 1.
  • FIG. 1 is a schematic perspective view of a liquid crystal display device according to Embodiment 1.
  • FIG. 1 is a schematic cross-sectional view of a liquid crystal display device according to a lamination structure 1-1 of Embodiment 1.
  • FIG. 1 is a schematic cross-sectional view of a liquid crystal display device according to laminated structure 1-2 in embodiment 1.
  • FIG. 1 is a schematic perspective view of a liquid crystal display device according to a laminated structure 1-2 of Embodiment 1.
  • FIG. 1 is a schematic plan view of a liquid crystal display device according to Embodiment 1.
  • FIG. 1 is a schematic cross-sectional view of a liquid crystal display device according to Embodiment 1.
  • FIG. 1 is a schematic perspective view of a liquid crystal display device according to Embodiment 1.
  • FIG. 1 is a schematic cross-sectional view of a liquid crystal display device according to laminated structure 1-3 of embodiment 1.
  • FIG. 1 is a schematic perspective view of a liquid crystal display device according to laminated structure 1-3 of embodiment 1.
  • FIG. 1 is a schematic cross-sectional view of a liquid crystal display device according to Example 1.
  • FIG. 5 is a schematic cross-sectional view of a liquid crystal display device according to Comparative Example 1;
  • FIG. 7 is an iso-contrast ratio contour line of the liquid crystal display device according to Example 1.
  • FIG. It is an iso-contrast ratio contour line of the liquid crystal display device which concerns on the comparative example 1.
  • FIG. It is an iso-contrast ratio contour line of the liquid crystal display device which concerns on the reference example 1.
  • FIG. 6 is a schematic cross-sectional view of a liquid crystal display device according to Example 2.
  • FIG. 10 is an iso-contrast ratio contour line of the liquid crystal display device according to Example 2.
  • FIG. 7 is a schematic cross-sectional view of a liquid crystal display device according to Example 3.
  • FIG. 16 is an iso-contrast ratio contour line of the liquid crystal display device according to Example 3.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the refractive index in the in-plane direction orthogonal to the slow axis "Nz” is the refractive index in the thickness direction.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the refractive index in the in-plane direction orthogonal to the slow axis "Nz” is the refractive index in the thickness direction.
  • In-plane retardation (Re) refers to the in-plane retardation value of a layer (film) at a wavelength of 550 nm at 23 ° C., unless otherwise specified.
  • Re (nx ⁇ ny) ⁇ d, where d (nm) is the thickness of the layer (film).
  • the optical compensation layer has an in-plane retardation Re of 15 nm or more and a retardation Rth in the thickness direction of +55 nm or more or -15 nm or less for light of wavelength 550 nm unless otherwise specified. And the function and optical performance thereof are not particularly limited. That is, the optical compensation layer is a layer satisfying 15 nm ⁇ Re and Rth ⁇ ⁇ 15 nm or +55 nm ⁇ Rth.
  • the viewing surface side and the rear surface viewing surface side mean the side closer to the screen (display surface) of the liquid crystal display device, and the rear surface side is more about the screen (display surface) of the liquid crystal display device It means the far side.
  • a member (for example, an optical compensation layer) adjacent to another member (for example, an optical compensation layer) means that an optical compensation layer is not provided between both members, for example, A form in which a layer having no optical anisotropy is disposed between the two members is included.
  • the layer having no optical anisotropy means a layer satisfying Re ⁇ 15 nm and ⁇ 15 nm ⁇ Rth ⁇ +55 nm.
  • FIG. 1 is a schematic plan view of the liquid crystal display device according to the first embodiment.
  • FIG. 2 is a schematic cross-sectional view of the liquid crystal display device according to the first embodiment.
  • the liquid crystal display device 1 according to the present embodiment includes a liquid crystal panel 2, and the liquid crystal panel 2 has a display area 2 a corresponding to the shape.
  • a plurality of pixels (not shown) are arranged in a matrix in the display area 2a, and an image is displayed in the display area 2a.
  • the liquid crystal display device 1 is a transmissive or semi-transmissive liquid crystal display device, and includes a liquid crystal panel 2 and a backlight (not shown) disposed on the back side of the liquid crystal panel 2 as shown in FIG.
  • the liquid crystal panel 2 includes a first polarizer 11, a first optical compensation layer 21, a second optical compensation layer 22, and a third optical compensation layer 23 functioning as a ⁇ / 4 retardation plate.
  • a liquid crystal cell 30, a fourth optical compensation layer 24 functioning as a ⁇ / 4 retardation plate, and a second polarizer 12 are provided in this order.
  • the first circularly polarizing plate 3 including the first polarizer 11, the first optical compensation layer 21, the second optical compensation layer 22, and the third optical compensation layer 23, and the fourth optical compensation
  • a second circularly polarizing plate 4 including a layer 24 and a second polarizer 12 is provided on both sides of the liquid crystal panel 2.
  • the liquid crystal cell 30 also includes a pair of substrates 31 and 32 facing each other, and a liquid crystal layer 33 between the pair of substrates 31 and 32.
  • FIG. 3 is a schematic perspective view of the liquid crystal display device according to the first embodiment.
  • the absorption axis 11a forms an angle of substantially 90 ° with the absorption axis 12a of the second polarizer 12, and the second optical compensation layer 22
  • the in-plane slow axis 22 a is substantially parallel to the absorption axis 11 a of the first polarizer 11, and the third optical compensation layer 23 has an in-plane slow axis 23 a of the absorption of the first polarizer 11.
  • the fourth optical compensation layer 24 has an in-plane slow axis 24 a relative to the in-plane slow axis 23 a of the third optical compensation layer 23 at an angle of substantially 45 ° or 135 ° with respect to the axis 11 a.
  • the angle is substantially 90 degrees.
  • the liquid crystal cell 30 aligns liquid crystal molecules in the liquid crystal layer 33 substantially perpendicularly to the pair of substrates 31 and 32 in black display.
  • the first optical compensation layer 21 has an in-plane retardation Re of 15 nm or less, and a thickness direction retardation Rth of ⁇ 60 nm or less, and the second optical compensation layer 22 has an in-plane retardation Re of Is 40 to 120 nm, and 1 ⁇ Nz ⁇ 4 is satisfied.
  • the first to fourth optical compensation layers 21 to 24 have relatively many options for their materials.
  • the optical compensation layer 24 to 24 it is possible to use an optical compensation layer having a relatively small change in characteristics such as optical parameters even under severe environments such as low temperature, high temperature, high temperature and high humidity environment. Therefore, even after the liquid crystal display device 1 is left in a severe environment such as a low temperature, a high temperature, a high temperature and high humidity environment, it is possible to suppress a decrease in display quality (for example, contrast, display unevenness).
  • a material having high durability to a solvent can be selected as the material of the first to fourth optical compensation layers 21 to 24, so that the solvent to the polarizing plate (circularly polarizing plates 3 and 4) Of the first to fourth optical compensation layers 21 to 24 can be suppressed from peeling from the first or second polarizer 11 or 12 and the first to fourth optical compensation layers 21 to 24 The occurrence of 24 fractures can be suppressed. Furthermore, according to the liquid crystal display device 1, the number of optical compensation layers can be reduced to a minimum of four (first to fourth optical compensation layers 21 to 24), thereby improving productivity (that is, reducing manufacturing costs). At the same time, the overall thickness of the liquid crystal display device 1 can be reduced.
  • the liquid crystal display device 1 can further include an optical compensation layer in addition to the first to fourth optical compensation layers 21 to 24 as described later, but the second optical compensation layer 22 is a first optical
  • the third optical compensation layer 23 is preferably disposed adjacent to the second optical compensation layer 22.
  • each member may be disposed such that the first polarizer 11 and the second polarizer 12 are on the viewing surface side and the back surface, respectively.
  • the respective members may be arranged such that the second polarizer 12 and the first polarizer 11 are on the viewing surface side and the back surface side, respectively.
  • the liquid crystal display device 1 is a normally black mode liquid crystal display device which performs black display when no voltage is applied.
  • the polarizers 11 and 12 are arranged in crossed nicols, and as described above
  • One polarizer 11 has an absorption axis 11 a substantially at an angle of 90 ° with respect to the absorption axis 12 a of the second polarizer 12.
  • the fact that the absorption axis 11a forms an angle of substantially 90 ° with respect to the absorption axis 12a means that, more specifically, the angle (absolute value) between the two axes is within a range of 90 ⁇ 2 °. This is preferably within the range of 90 ⁇ 0.6 °, and particularly preferably 90 ° (perfectly orthogonal).
  • the in-plane slow axis 22 a is substantially parallel to the absorption axis 11 a of the first polarizer 11.
  • that the in-plane slow axis 22a is substantially parallel to the absorption axis 11a more specifically means that the angle x between the two axes satisfies -5 ° ⁇ x ⁇ 5 °.
  • Preferably satisfies -3 ° ⁇ x ⁇ 3 °, more preferably satisfies ⁇ 1 ° ⁇ x ⁇ 1 °, still more preferably satisfies ⁇ 0.5 ° ⁇ x ⁇ 0.5 °, particularly preferably x 0 (perfectly parallel). If the angle x satisfies x ⁇ ⁇ 5 ° or 5 ° ⁇ x, the normal contrast and the viewing angle characteristics may be degraded.
  • the in-plane slow axis 23a forms an angle of substantially 45 ° or 135 ° with the absorption axis 11a of the first polarizer 11.
  • that the in-plane slow axis 23a makes an angle of substantially 45 ° or 135 ° with the absorption axis 11a means that the angle (absolute value) between the two axes is 45 ⁇ 5 ° or 135 ⁇ 5.
  • the in-plane slow axis 24a forms an angle of substantially 90 ° with the in-plane slow axis 23a of the third optical compensation layer 23.
  • the fact that the in-plane slow axis 24a forms an angle of substantially 90 ° with the in-plane slow axis 23a means that the angle (absolute value) between the two axes is 90 ⁇ , more specifically. It means within the range of 2 °, preferably within the range of 90 ⁇ 0.6 °, and particularly preferably 90 ° (completely orthogonal).
  • polarizer Any appropriate polarizer may be employed as the first polarizer 11 and the second polarizer 12 depending on the purpose.
  • a hydrophilic polymer film such as a polyvinyl alcohol-based film (hereinafter, also referred to as a PVA film), a partially formalized polyvinyl alcohol-based film, or an ethylene / vinyl acetate copolymer-based partially saponified film
  • a dichromatic substance dichroic dye
  • a polarizer obtained by adsorbing a dichroic substance (dichroic dye) such as iodine to a polyvinyl alcohol-based film and uniaxially stretching it is particularly preferable because the polarization dichroic ratio is high.
  • the thickness of these polarizers is not particularly limited, but in general, it is about 5 to 30 ⁇ m.
  • a polarizer obtained by adsorbing iodine to a polyvinyl alcohol-based film and uniaxially stretching it can be produced, for example, by dyeing polyvinyl alcohol by immersing it in an aqueous solution of iodine and stretching it to 3 to 7 times its original length. . If necessary, it may contain boric acid, zinc sulfate, zinc chloride or the like, or it may be immersed in an aqueous solution such as potassium iodide. Furthermore, if necessary, the polyvinyl alcohol-based film may be dipped in water and rinsed before dyeing.
  • Stretching may be carried out after dyeing with iodine, may be stretched while dyeing, or may be dyed with iodine after being stretched. It can also be stretched in an aqueous solution of boric acid or potassium iodide or in a water bath.
  • the first polarizer 11 and the second polarizer 12 may each be provided with a protective layer on the viewing surface side and the back surface side.
  • the protective layer is formed of any suitable film that can be used as a protective layer of a polarizer.
  • Specific examples of the material that is the main component of the film include, for example, cellulose resins such as triacetyl cellulose (TAC), and transparent resins such as cycloolefin resins. The cycloolefin resin will be described in detail later.
  • a film having triacetyl cellulose as a main component is also referred to as a TAC film
  • a film having a cycloolefin resin, in particular, a cycloolefin polymer (COP) as a main component is also referred to as a COP film.
  • COP cycloolefin polymer
  • the protective layer when a protective layer is provided on the liquid crystal cell 30 side of the first polarizer 11 and / or the second polarizer 12, the protective layer (inner protective layer) preferably has optical isotropy.
  • the retardation Rth in the thickness direction of the inner protective layer is preferably more than -15 nm and less than +15 nm, more preferably -10 nm or more and +10 nm or less, still more preferably -6 nm or more and +6 nm or less, particularly preferably -3 nm or more and +3 nm or less.
  • the in-plane retardation Re of the inner protective layer is preferably 0 nm or more and less than 15 nm, more preferably 0 nm or more and 10 nm or less, still more preferably 0 nm or more and 6 nm or less, and particularly preferably 0 nm or more and 3 nm or less.
  • an optical compensation layer for example, the first optical compensation layer 21 or the fourth optical compensation layer 21 immediately adjacent to the liquid crystal cell 30 side of the first polarizer 11 and the second polarizer 12.
  • the optical compensation layer 24 or the like may be used as a protective layer.
  • the first optical compensation layer 21 satisfies Re ⁇ 15 nm and Rth ⁇ ⁇ 60 nm.
  • the in-plane retardation Re of the first optical compensation layer 21 is preferably 0 to 10 nm, more preferably 0 to 5 nm, still more preferably 0 to 3 nm, and still more preferably 0 to 1 nm. Is particularly preferred.
  • the thickness direction retardation Rth of the first optical compensation layer 21 can be appropriately set within the above range according to the optical parameters of the other members.
  • the first optical compensation layer 21 can be regarded as substantially optically isotropic in the plane when the in-plane retardation Re is sufficiently small, such as 15 nm or less, so the surface of the first optical compensation layer 21 is
  • the arrangement direction in the inside is not particularly limited.
  • the second optical compensation layer 22 satisfies 40 nm ⁇ Re ⁇ 120 nm and 1 ⁇ Nz ⁇ 4.
  • the in-plane retardation Re of the second optical compensation layer 22 can be appropriately set within the above range according to the optical parameters of the other members.
  • the third optical compensation layer 23 and the fourth optical compensation layer 24 function as ⁇ / 4 retardation plates as described above.
  • the ⁇ / 4 retardation plate is an electron optical birefringence plate that serves to rotate the polarization plane of the light beam, and has an optical path of 1 ⁇ 4 wavelength between linearly polarized light vibrating in directions perpendicular to each other.
  • the phase between the ordinary ray component and the extraordinary ray component acts so as to be shifted by a quarter cycle, and circularly polarized light is converted to linearly polarized light (or linearly polarized light to circularly polarized light). Therefore, the first polarizer 11 and the third optical compensation layer 23, and the second polarizer 12 and the fourth optical compensation layer 24 function as left and right circularly polarizing plates orthogonal to each other.
  • the third optical compensation layer 23 and the fourth optical compensation layer 24 each have an in-plane retardation Re of approximately 137.5 nm, but may be 100 to 175 nm, and 110 to 165 nm. Is preferable, and 130 to 145 nm is more preferable. From the viewpoint of maintaining high contrast, the in-plane retardation Re of the third optical compensation layer 23 is preferably substantially the same as the in-plane retardation Re of the fourth optical compensation layer 24.
  • the in-plane retardation Re of the third optical compensation layer 23 and the fourth optical compensation layer 24 is substantially the same, more specifically, the difference between the two in-plane retardations Re ( It means that the absolute value) is 7.64 nm or less, preferably 2 nm or less, more preferably 1 nm or less, and particularly preferably 0 nm (completely the same).
  • the third optical compensation layer 23 and the fourth optical compensation layer 24 each satisfy 1 ⁇ Nz ⁇ 2.4.
  • the material and formation method of the first to fourth optical compensation layers 21 to 24 there is no particular limitation on the material and formation method of the first to fourth optical compensation layers 21 to 24.
  • the polymer film is processed by stretching or the like, the orientation of the liquid crystalline material is fixed, and it is composed of an inorganic material.
  • thin plates or the like to be used can be used, among them, one obtained by processing a polymer film by drawing or the like and one obtained by fixing the orientation of a liquid crystalline material are preferable.
  • the liquid crystal compound is preferably a polymerizable liquid crystal.
  • the first to fourth optical compensation layers 21 to 24 in the case of a polymer film, for example, a solvent cast method, a melt extrusion method or the like can be used. It may be a method of simultaneously forming a plurality of birefringent layers by a co-extrusion method. As long as the desired retardation is developed, it may be non-stretching or may be stretched.
  • the stretching method is also not particularly limited, and it is a special stretching in which stretching is performed under the action of the shrinking force of the heat shrinkable film, in addition to the inter-roll tensile stretching method, inter-roll compression stretching method, tenter transverse uniaxial stretching method, longitudinal and transverse biaxial stretching method. A law etc. can be used.
  • a method of applying a liquid crystalline material on a substrate film subjected to alignment treatment, and orienting and fixing can be used. Even if there is a method in which the substrate film is not subjected to special orientation processing as long as the desired phase difference is expressed, or a method in which the film is peeled off from the substrate film and transferred to another film after orientation fixation. Good. Furthermore, a method in which the orientation of the liquid crystal material is not fixed may be used. Also in the case of a non-liquid crystal material, the same formation method as the liquid crystal material may be used.
  • the liquid crystalline material may be coated on the second optical compensation layer 22.
  • transparent resin such as cycloolefin system resin, cellulose system resin, (meth) acrylic resin
  • (meth) acrylic resin is mentioned, for example.
  • (meth) acrylic-type resin represents at least 1 sort (s) chosen from the group which consists of acrylic resin and methacrylic resin. The same applies to other terms with "(meth)”.
  • the above cycloolefin resin is not particularly limited as long as it is a resin having a monomer unit consisting of cyclic olefin (cycloolefin), and may be any of cycloolefin polymer (COP) or cycloolefin copolymer (COC) .
  • the cycloolefin copolymer refers to a non-crystalline cyclic olefin resin which is a copolymer of a cyclic olefin and an olefin such as ethylene.
  • polycyclic cyclic olefin examples include norbornenes such as norbornene, methyl norbornene, dimethyl norbornene, ethyl norbornene, ethylidene norbornene and butyl norbornene, dicyclopentadiene, dihydrodicyclopentadiene, methyldicyclopentadiene, dimethyldicyclopentadiene and the like
  • Examples include tetracyclododecenes such as dicyclopentadienes, tetracyclododecene, methyltetracyclododecene and dimethyltetracyclododecene, and polymers of cyclopentadienes such as tricyclopentadiene and tetracyclopentadiene.
  • examples of monocyclic cyclic olefins include cyclobutene, cyclopentene, cyclooctene, cyclooctadiene, cyclooctatriene and cyclododecatriene.
  • norbornenes are preferable in terms of transparency, moisture resistance, and retardation control.
  • cellulose resin part or all of hydrogen atoms in hydroxyl groups of cellulose obtained from raw material cellulose such as cotton linta and wood pulp (hardwood pulp and softwood pulp) are substituted with acetyl group, propionyl group and / or butyryl group
  • Cellulose organic acid ester or cellulose mixed organic acid ester For example, those composed of cellulose acetate, propionate, butyrate, mixed esters thereof and the like can be mentioned. Among them, triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate and cellulose acetate butyrate are preferable.
  • the (meth) acrylic resin is a polymer containing a structural unit derived from a (meth) acrylic monomer.
  • the polymer is typically a polymer containing a methacrylic acid ester.
  • the proportion of constituent units derived from methacrylic acid ester is a polymer containing 50% by weight or more based on all constituent units.
  • the (meth) acrylic resin may be a homopolymer of methacrylic acid ester, or may be a copolymer containing a structural unit derived from another polymerizable monomer. In this case, the proportion of constituent units derived from other polymerizable monomers is preferably 50% or less based on all constituent units.
  • methacrylic acid alkyl ester which can comprise the said (meth) acrylic-type resin
  • methacrylic acid alkyl ester is preferable.
  • alkyl methacrylate methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate
  • methacrylic acid alkyl esters having 1 to 8 carbon atoms in the alkyl group such as 2-hydroxyethyl methacrylate.
  • the carbon number of the alkyl group contained in the methacrylic acid alkyl ester is preferably 1 to 4.
  • the (meth) acrylic resin only one kind of methacrylic acid ester may be used alone, or two or more kinds thereof may be used in combination.
  • Examples of the other polymerizable monomer which can constitute the (meth) acrylic resin include acrylic acid esters and compounds having a polymerizable carbon-carbon double bond in another molecule.
  • the other polymerizable monomers may be used alone or in combination of two or more.
  • acrylic acid ester acrylic acid alkyl ester is preferable.
  • alkyl acrylate methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate
  • alkyl acrylates having 1 to 8 carbon atoms in the alkyl group such as 2-hydroxyethyl acrylate.
  • the carbon number of the alkyl group contained in the acrylic acid alkyl ester is preferably 1 to 4. In the (meth) acrylic resin, only one acrylic ester may be used alone, or two or more acrylic esters may be used in combination.
  • Examples of the other compound having a polymerizable carbon-carbon double bond in the molecule include vinyl compounds such as ethylene, propylene and styrene, and vinyl cyan compounds such as acrylonitrile.
  • vinyl compounds such as ethylene, propylene and styrene
  • vinyl cyan compounds such as acrylonitrile.
  • the compound having a polymerizable carbon-carbon double bond in the other molecule one type may be used alone, or two or more types may be used in combination.
  • the polymerizable liquid crystal is a compound having a polymerizable group and having liquid crystallinity.
  • the polymerizable group means a group involved in the polymerization reaction, and is preferably a photopolymerizable group.
  • the photopolymerizable group refers to a group capable of participating in the polymerization reaction by active radicals or acids generated from the photopolymerization initiator.
  • Examples of the polymerizable group include vinyl group, vinyloxy group, 1-chlorovinyl group, isopropenyl group, 4-vinylphenyl group, acryloyloxy group, methacryloyloxy group, oxiranyl group, oxetanyl group and the like.
  • the liquid crystallinity may be a thermotropic liquid crystal or a lyotropic liquid crystal. If the thermotropic liquid crystals are classified according to the degree of order, they may be nematic liquid crystals or smectic liquid crystals, but from the viewpoint of easiness of film formation, thermotropic nematic liquid crystals are preferred. .
  • polymerizable liquid crystal examples include “3.8.6 Network (fully cross-linked type)”, “6. .5.1 Liquid Crystal Materials b. Compounds Having a Polymerizable Group Among the Compounds Described in the Polymerizable Nematic Liquid Crystal Material], compounds disclosed in JP 2010-31223 A, JP 2010-270108 A, JP 2011-6360 A And polymerizable liquid crystals described in JP-A-2011-207765.
  • All of these materials are materials in which the problems as described in the above (1) to (3) are solved or the influence is small, but among them, as the first optical compensation layer 21, a polymerizable liquid crystal It is preferable that the polymer is oriented in parallel to the base material (substrate) and polymerized, and as the second to fourth optical compensation layers 22 to 24, those obtained by drawing a cycloolefin resin, It is preferable to use one obtained by stretching acetyl cellulose, one obtained by stretching a (meth) acrylic resin, and one obtained by orientating and polymerizing a polymerizable liquid crystal in parallel to a substrate (substrate).
  • optical compensation layer formed by the above-mentioned material and forming method as the first to fourth optical compensation layers 21 to 24, occurrence of peeling and breakage even if the solvent adheres to the circularly polarizing plates 3 and 4 Can be suppressed.
  • the liquid crystal cell 30 includes the pair of substrates 31 and 32 facing each other, and the liquid crystal layer 33 between the pair of substrates 31 and 32.
  • a color filter substrate On one of the substrates 31 and 32 (color filter substrate), a color filter, a black matrix and a common electrode are provided.
  • a switching element typically, a TFT for controlling the electro-optical characteristics of liquid crystal, and a scanning line for applying a gate signal to the switching element And a pixel electrode.
  • the color filter may have a thickness direction retardation Rth of about 10 to 50 nm.
  • the color filter may be provided on the active matrix substrate side. The distance between the substrates 31 and 32 (cell gap) is controlled by the spacer.
  • an alignment film made of polyimide is provided on the side of each of the substrates 31 and 32 in contact with the liquid crystal layer 33.
  • the liquid crystal molecules in the liquid crystal layer 33 are substantially perpendicular to the pair of substrates 31 and 32 during black display (black display of the liquid crystal display device 1). Orientation in the normal direction).
  • substantially perpendicular also includes the case where the alignment vector of the liquid crystal molecules is tilted with respect to the normal direction of each substrate 31, 32, that is, the case where the liquid crystal molecules have a tilt angle.
  • the tilt angle (angle from the normal) is at least 0 ° and preferably at all positions of the displayable portion of the liquid crystal panel 2 (the modulatable portion of the light except for the light shielding portion in the display area 2a).
  • the liquid crystal molecules are aligned substantially perpendicular (normal direction) to the surfaces of the substrates 31 and 32 when no voltage is applied.
  • Such alignment can be realized, for example, by arranging a nematic liquid crystal having negative dielectric anisotropy between substrates on which a vertical alignment film is formed as an alignment film.
  • the major axes of the liquid crystal molecules are aligned parallel to the surface of each substrate.
  • the liquid crystal molecules in this state exhibit birefringence with respect to linearly polarized light that has entered the liquid crystal layer through the polarizer on the back side, and the polarization state of the incident light changes in accordance with the inclination of the liquid crystal molecules.
  • a predetermined maximum voltage is applied, light passing through the liquid crystal layer becomes, for example, linearly polarized light whose polarization direction is rotated by 90 °. Therefore, light passing through the polarizer on the viewing surface side is displayed in a bright state (white display) Is obtained.
  • gradation display can be performed by changing the applied voltage to control the inclination of the liquid crystal molecules and changing the transmitted light intensity from the polarizer on the observation surface side.
  • the polarizer axis orientation and the tilt orientation of liquid crystal molecules at the time of voltage application are set to form an angle of 45 °.
  • the transmittance when a birefringent medium is sandwiched between crossed Nicol polarizers is sin 2 (2 ⁇ ), where the angle between the axis of the polarizer and the slow axis of the birefringent medium is ⁇ (unit: rad)
  • ⁇ unit: rad
  • the tilt orientation of liquid crystal molecules can be divided into four domains of 45 °, 135 °, 225 °, and 315 °. Even in the MVA mode divided into such four domains, Schlieren orientation or orientation in an unintended direction is often observed in the vicinity of domain boundaries or orientation control means, which causes transmittance loss. There is.
  • the transmittance when the birefringent medium is sandwiched between the left and right circularly polarizing plates 3 and 4 orthogonal to each other is Because it does not depend on the angle between the axes of the polarizers 11 and 12 and the slow axis of the birefringent medium, the liquid crystal molecules are not inclined at 45 °, 135 °, 225 °, 315 °, If the inclination can be controlled, the desired transmittance can be secured. Therefore, for example, a circular protrusion may be disposed at the center of the pixel, and liquid crystal molecules may be inclined in all directions, or may be inclined in random directions without controlling the inclination direction at all. May be
  • the retardation (panel retardation) ⁇ n ⁇ d of the liquid crystal layer 33 represented by the product of ⁇ n and cell thickness (cell gap, ie, thickness of the liquid crystal layer 33) d of the liquid crystal material is not particularly limited. Usually, it is 200 to 500 nm, preferably 250 to 450 nm, and more preferably 300 to 400 nm.
  • FIG. 4 is a schematic cross-sectional view of the liquid crystal display device according to the multilayer structure 1-1 of the first embodiment.
  • the liquid crystal display device 1 of this embodiment does not include an optical compensation layer other than the first to third optical compensation layers 21 to 23 between the first polarizer 11 and the liquid crystal cell 30.
  • an optical compensation layer other than the fourth optical compensation layer 24 may not be provided between the liquid crystal cell 30 and the second polarizer 12.
  • the first optical compensation layer 21 has a thickness direction retardation Rth of -200 to -100 nm (more preferably -180 to -120 nm), and the second optical compensation layer 22 has an in-plane position.
  • the third optical compensation layer 23 has a phase difference Re of 60 to 110 nm (more preferably 70 to 100 nm) and satisfies 1 ⁇ Nz ⁇ 1.4 (more preferably 1 ⁇ Nz ⁇ 1.2).
  • the fourth optical compensation layer 24 satisfies 1.4 ⁇ Nz ⁇ 2.4 (more preferably 1.5 ⁇ Nz ⁇ 1.8), and 1.4 ⁇ Nz ⁇ 2.4 (more preferably 2 ⁇ ). It is preferable to satisfy Nz ⁇ 2.3).
  • the first polarizer 11 may be disposed adjacent to the first optical compensation layer 21, and the third optical compensation layer 23 and the fourth optical compensation layer 24 may be disposed in the liquid crystal cell 30.
  • the second polarizer 12 may be disposed adjacent to the fourth optical compensation layer 24.
  • FIG. 5 is a schematic cross-sectional view of the liquid crystal display device according to the multilayer structure 1-2 in the first embodiment.
  • FIG. 6 is a schematic perspective view of the liquid crystal display device according to the layered structure 1-2 of the first embodiment.
  • the liquid crystal display device 1 of the present embodiment further includes a fifth optical compensation layer 25 and a sixth optical compensation layer 26, and the first polarizer 11 and the first optical compensation.
  • the two polarizers 12 may be arranged in this order.
  • the fifth optical compensation layer 25 has an in-plane retardation Re of 40 to 120 nm and satisfies 1 ⁇ Nz ⁇ 4.
  • the fifth optical compensation layer 25 has the in-plane slow axis 25 a substantially parallel to the absorption axis 12 a of the second polarizer 12.
  • the sixth optical compensation layer 26 has an in-plane retardation Re of 15 nm or less and a thickness direction retardation Rth of -60 nm or less.
  • the laminated structure 1-1 it is possible to exhibit more excellent viewing angle characteristics than the laminated structure 1-1.
  • the laminated structure 1-1 is more preferable than the present laminated structure.
  • the material having high durability to the solvent can be selected as the material of the fifth to sixth optical compensation layers 25 to 26, the solvent is attached to the polarizing plates (circularly polarizing plates 3 and 4)
  • peeling of the first to sixth optical compensation layers 21 to 26 from the first or second polarizer 11 or 12 can be suppressed, and peeling and the first to sixth optical compensation layers 21 can be suppressed. It is possible to suppress the occurrence of breakage of ⁇ 26.
  • the first and sixth optical compensation layers 21 and 26 each have a thickness direction retardation Rth of ⁇ 150 to ⁇ 80 nm (more preferably ⁇ 120 to ⁇ 90 nm), and
  • the fifth optical compensation layers 22 and 25 each have an in-plane retardation Re of 40 to 90 nm (more preferably 40 to 60 nm), and 1 ⁇ Nz ⁇ 1.4 (more preferably 1 ⁇ Nz ⁇ ).
  • the third optical compensation layer 23 satisfies 1.4 ⁇ Nz ⁇ 2.4 (more preferably 1.5 ⁇ Nz ⁇ 1.8), and the fourth optical compensation layer 24 It is preferable to satisfy 1.4 ⁇ Nz ⁇ 2.4 (more preferably 2 ⁇ Nz ⁇ 2.3).
  • the fifth optical compensation layer 25 is preferably disposed adjacent to the sixth optical compensation layer 26, and the fourth optical compensation layer 24 is disposed adjacent to the fifth optical compensation layer 25.
  • the first polarizer 11 may be disposed adjacent to the first optical compensation layer 21, and the third optical compensation layer 23 and the fourth optical compensation layer 24 are disposed adjacent to the liquid crystal cell 30.
  • the second polarizer 12 may be disposed adjacent to the sixth optical compensation layer 26.
  • the in-plane slow axis 25 a is substantially parallel to the absorption axis 12 a of the second polarizer 12.
  • that the in-plane slow axis 25a is substantially parallel to the absorption axis 12a more specifically means that the angle between the two axes is in the range of 0 ⁇ 3 °, It is preferably in the range of 0 ⁇ 1 °, more preferably in the range of 0 ⁇ 0.5 °, and particularly preferably 0 ° (perfectly parallel).
  • the fifth optical compensation layer 25 satisfies 40 nm ⁇ Re ⁇ 120 nm and 1 ⁇ Nz ⁇ 4.
  • the in-plane retardation Re of the fifth optical compensation layer 25 can be appropriately set within the above range according to the optical parameters of the other members.
  • the sixth optical compensation layer 26 satisfies Re ⁇ 15 nm and Rth ⁇ ⁇ 60 nm.
  • the in-plane retardation Re of the sixth optical compensation layer 26 is preferably 0 to 10 nm, more preferably 0 to 5 nm, still more preferably 0 to 3 nm, and further preferably 0 to 1 nm. Is particularly preferred.
  • the thickness direction retardation Rth of the sixth optical compensation layer 26 can be appropriately set within the above range according to the optical parameters of the other members.
  • the sixth optical compensation layer 26 can be regarded as substantially optically isotropic in the plane when the in-plane retardation Re is sufficiently small, such as 15 nm or less, so the surface of the sixth optical compensation layer 26 is
  • the arrangement direction in the inside is not particularly limited.
  • Examples of materials and formation methods of the fifth to sixth optical compensation layers 25 to 26 include the same ones as those of the first to fourth optical compensation layers 21 to 24 described above.
  • the fifth optical compensation layer 25 one obtained by drawing a cycloolefin resin, one obtained by drawing a cellulose resin, particularly triacetyl cellulose, one obtained by drawing a (meth) acrylic resin, and It is preferable that the liquid crystal is aligned and parallel to the base material (substrate) and polymerized
  • the sixth optical compensation layer 26 one obtained by aligning and polymerizing the polymerizable liquid crystal parallel to the base material (substrate) It is suitable.
  • FIG. 7 is a schematic cross-sectional view of the liquid crystal display device according to the layered structure 1-3 of the first embodiment.
  • FIG. 8 is a schematic perspective view of the liquid crystal display device according to the layered structure 1-3 of the first embodiment.
  • the liquid crystal display device 1 of the present embodiment further includes a seventh optical compensation layer 27 and an eighth optical compensation layer 28, and the first polarizer 11, the first optical compensation.
  • the optical compensation layer 25, the sixth optical compensation layer 26, and the second polarizer 12 may be disposed in this order.
  • the seventh optical compensation layer 27 and the eighth optical compensation layer 28 each have an in-plane retardation Re of 15 nm or less, a thickness direction retardation Rth of 50 to 300 nm, and satisfy Nz> 1.
  • the laminated structure 1-1 compared to the laminated structure 1-1, it is possible to exhibit viewing angle characteristics with less omnidirectional bias.
  • the laminated structure 1-1 is more preferable than the present laminated structure.
  • the material having high durability to the solvent can be selected as the material of the seventh to eighth optical compensation layers 27 to 28, the solvent is attached to the polarizing plates (circularly polarizing plates 3 and 4)
  • peeling of the first to eighth optical compensation layers 21 to 28 from the first or second polarizer 11 or 12 can be suppressed, and peeling and the first to eighth optical compensation layers 21 can be suppressed. It is possible to suppress the occurrence of breakage of ⁇ 28.
  • the first and sixth optical compensation layers 21 and 26 each have a thickness direction retardation Rth of ⁇ 150 to ⁇ 80 nm (more preferably ⁇ 120 to ⁇ 90 nm), and
  • the fifth optical compensation layers 22 and 25 each have an in-plane retardation Re of 40 to 90 nm (more preferably 45 to 60 nm), and 1 ⁇ Nz ⁇ 1.4 (more preferably 1 ⁇ Nz ⁇ ). It is preferable to satisfy 1.2), and the third and fourth optical compensation layers 23 and 24 each satisfy 1 ⁇ Nz ⁇ 1.4 (more preferably 1 ⁇ Nz ⁇ 1.2).
  • the fifth optical compensation layer 25 is preferably disposed adjacent to the sixth optical compensation layer 26, and the fourth optical compensation layer 24 is disposed adjacent to the fifth optical compensation layer 25.
  • the seventh optical compensation layer 27 is preferably disposed adjacent to the third optical compensation layer 23, and the eighth optical compensation layer 28 is disposed adjacent to the fourth optical compensation layer 24. Is preferred.
  • the first polarizer 11 may be disposed adjacent to the first optical compensation layer 21, and the seventh and eighth optical compensation layers 27 and 28 may be disposed adjacent to the liquid crystal cell 30.
  • the second polarizer 12 may be disposed adjacent to the sixth optical compensation layer 26.
  • the seventh and eighth optical compensation layers 27 and 28 satisfy Re ⁇ 15 nm, 50 nm ⁇ Rth ⁇ 300 nm, and Nz> 1.
  • the in-plane retardation Re of each of the seventh and eighth optical compensation layers 27 and 28 is preferably 0 to 10 nm, more preferably 0 to 5 nm, and still more preferably 0 to 3 nm. Particularly preferred is 0 to 1 nm.
  • the thickness direction retardation Rth of the seventh and eighth optical compensation layers 27 and 28 can be appropriately set within the above range according to the optical parameters of the other members.
  • the seventh and eighth optical compensation layers 27 and 28 can be regarded as substantially optically isotropic in the plane when the in-plane retardation Re is sufficiently small, such as 15 nm or less.
  • the arrangement direction of the eight optical compensation layers 27 and 28 in the plane is not particularly limited.
  • the thickness direction retardations Rth of the seventh and eighth optical compensation layers 27 and 28 may be different from each other or may be the same, and in any case, the sum of the thickness direction retardations Rth of the both is the same. It can function as well.
  • the total of the thickness direction retardations Rth of the seventh and eighth optical compensation layers 27 and 28 is preferably 100 nm or more and 300 nm or less, and more preferably 150 nm or more and 250 nm or less.
  • Examples of materials and forming methods of the seventh to eighth optical compensation layers 27 to 28 include the same ones as those of the first to fourth optical compensation layers 21 to 24 described above. Among them, as the seventh to eighth optical compensation layers 27 to 28, those obtained by stretching a cycloolefin resin, and those obtained by stretching a cellulose resin, particularly triacetyl cellulose, and a (meth) acrylic resin are preferred.
  • each axial direction is represented by an angle when the right direction of the display area of the liquid crystal panel is 0 ° and the counterclockwise direction is positive when viewed from the viewing surface side. .
  • FIG. 9 is a schematic cross-sectional view of the liquid crystal display device according to the first embodiment.
  • a front polarizer a first optical compensation layer as a positive C plate, a second optical compensation layer as a positive A plate, a third optical compensation layer as a ⁇ / 4 retardation plate, A liquid crystal cell, a fourth optical compensation layer as a ⁇ / 4 retardation plate, a liquid crystal panel in which a back polarizer is disposed in this order from the observation surface side, and a backlight (not shown) of the liquid crystal panel
  • the optical parameters of the respective members and the axial directions of the respective polarizers and the respective optical compensation layers are as shown in FIG.
  • the front polarizer corresponds to the first polarizer
  • the back polarizer corresponds to the second polarizer.
  • the liquid crystal cell As the liquid crystal cell, a VA mode liquid crystal cell was used.
  • the dielectric anisotropy ⁇ n of the liquid crystal material is 0.113, and the cell thickness (cell gap) d is 3.2 ⁇ m. That is, the retardation ⁇ n ⁇ d of the liquid crystal layer was 360 nm.
  • the second to fourth optical compensation layers films in which predetermined optical parameters shown in FIG. 9 were obtained by biaxially stretching a COP film were used.
  • the first optical compensation layer a film having a predetermined optical parameter shown in FIG. 9 obtained by applying a liquid crystalline material on the second optical compensation layer was used.
  • the COP film used did not contain cycloolefin copolymer (COC).
  • a front polarizer and a back polarizer what laminated
  • the COP films of the front polarizer and the back polarizer were produced so as not to have optical anisotropy.
  • the front polarizer and the back polarizer were disposed such that the COP film was on the liquid crystal cell side and the TAC film was on the opposite side to the liquid crystal cell.
  • a PVA film of a front polarizer and a back polarizer what has a polarization performance by adding iodine after extending
  • a TAC film is widely used as a support body of a PVA film, adhere
  • a COP film is widely used as a broad-band retardation film or as a support of a PVA film, and has birefringence by stretching.
  • first and second optical compensation layers are disposed on the viewing surface side in the first embodiment, they may be disposed on the back surface side.
  • each polarizer and each optical compensation layer may be rotated while maintaining the relative angle of the axes, or may be moved in line symmetry.
  • FIG. 10 is a schematic cross-sectional view of a liquid crystal display device according to Comparative Example 1.
  • a ninth optical compensation layer as a positive B plate was used instead of the first and second optical compensation layers.
  • a liquid crystal display was produced.
  • the ninth optical compensation layer a film having predetermined optical parameters shown in FIG. 10 by stretching and relaxing the COP film was used.
  • Example 1 and Comparative Example 1 The dark room contrast of the liquid crystal display of Example 1 and Comparative Example 1 was measured.
  • the dark room contrast is obtained by measuring the luminance of white display and black display without external light, and dividing the white display luminance by the black display luminance. The higher the display device, the better. Furthermore, from the viewpoint of durability, it is preferable that the change in this numerical value be as small as possible when exposed to a severe environment such as high temperature.
  • Table 1 below shows dark room contrast at the center of the screen before and after aging for 12 hours at 85 ° C. for Example 1 and Comparative Example 1. Although there is not much difference with the value before the aging, the value in Comparative Example 1 is greatly reduced by the aging. On the other hand, in Example 1, the change was small and it was shown that the durability was improved.
  • the black display uniformity of the liquid crystal display devices of Example 1 and Comparative Example 1 was measured.
  • the black display uniformity is an index indicating the intensity of so-called unevenness of black display, which is obtained by dividing the minimum luminance by the maximum luminance by scanning the luminance of the display area when a black solid screen is displayed. As this value is closer to 100%, there is no luminance distribution, that is, the unevenness is weak, which is preferable as a display device. The lower the value, the stronger the unevenness and the lower the quality as a display device.
  • Table 2 below shows black display uniformity before and after aging for 12 hours at 85 ° C. for Example 1 and Comparative Example 1. Although there is not much difference with the value before the aging, the value in Comparative Example 1 is greatly reduced by the aging. On the other hand, in Example 1, the change was small and it was shown that the durability was improved.
  • FIGS. 11 and 12 show the simulation results (isocontrast ratio contour lines) of the viewing angle characteristics of the liquid crystal display according to Example 1 and Comparative Example 1, respectively.
  • portions where the contrast is 100 or 1000 are indicated by solid lines.
  • FIGS. 11 and 12 although the direction in which the viewing angle characteristics are excellent is different, it can be adjusted by, for example, the rotation of the axis of the polarizer. In consideration of that, it is shown that Example 1 has a viewing angle characteristic which is almost equal to or slightly superior to Comparative Example 1.
  • FIG. 13 is an iso-contrast ratio contour line of the liquid crystal display device according to the first reference example.
  • the reference example 1 has the same configuration as that of the example 1 except that the slow axis of the second optical compensation layer is disposed in a direction forming an angle of 90 ° with the absorption axis of the front polarizer.
  • the relative angle is 0 ° (or 180 °)
  • the viewing angle characteristics will be good, but as shown in FIG. 13, if the relative angle is 90 °, the viewing angle Properties are not suitable for practical use because of deterioration.
  • the angle X between the slow axis of the second optical compensation layer and the absorption axis of the front polarizer (first polarizer) is -5. It is preferable to set the range of ° ⁇ X ⁇ 5 °.
  • FIG. 14 is a schematic cross-sectional view of the liquid crystal display device according to the second embodiment.
  • a front polarizer a first optical compensation layer as a positive C plate, a second optical compensation layer as a positive A plate, a third optical compensation layer as a ⁇ / 4 retardation plate, Liquid crystal cell, fourth optical compensation layer as ⁇ / 4 retardation plate, fifth optical compensation layer as positive A plate, sixth optical compensation layer as positive C plate, and back polarizer
  • a liquid crystal display device of Example 2 provided with a liquid crystal panel arranged in this order from the side and a back light (not shown) on the back side of the liquid crystal panel was produced.
  • the optical parameters of the respective members and the axial directions of the respective polarizers and the respective optical compensation layers are as shown in FIG.
  • the front polarizer corresponds to the first polarizer
  • the back polarizer corresponds to the second polarizer.
  • the present embodiment is substantially the same as the first embodiment, but in the present embodiment, the viewing angle characteristics are further enhanced by similarly arranging the optical compensation layer on the viewing surface side and the back surface side. Can.
  • the liquid crystal cell As the liquid crystal cell, a VA mode liquid crystal cell was used.
  • the dielectric anisotropy ⁇ n of the liquid crystal material is 0.113, and the cell thickness (cell gap) d is 3.2 ⁇ m. That is, the retardation ⁇ n ⁇ d of the liquid crystal layer was 360 nm.
  • films in which predetermined optical parameters shown in FIG. 14 were obtained by biaxially stretching a COP film were used.
  • films obtained by applying the liquid crystalline material on the second and fifth optical compensation layers and using the predetermined optical parameters shown in FIG. 14 were used. .
  • a front polarizer and a back polarizer what laminated
  • the COP films of the front polarizer and the back polarizer were produced so as not to have optical anisotropy.
  • the front polarizer and the back polarizer were disposed such that the COP film was on the liquid crystal cell side and the TAC film was on the opposite side to the liquid crystal cell.
  • a PVA film of a front polarizer and a back polarizer what has a polarization performance by adding iodine after extending
  • first and second optical compensation layers are disposed on the viewing surface side in the second embodiment, they may be disposed on the back surface side.
  • each polarizer and each optical compensation layer may be rotated while maintaining the relative angle of the axes, or may be moved in line symmetry.
  • Example 2 and Comparative Example 1 The same thing as in the above ⁇ Comparison of Example 1 and Comparative Example 1> applies to Example 2 and Comparative Example 1.
  • Table 5 below shows black display uniformity before and after aging for 12 hours at 85 ° C. for Example 2 and Comparative Example 1.
  • Example 1 the change in dark room contrast and black display uniformity before and after aging is also smaller in Example 2 than in Comparative Example 1, indicating that the durability is excellent.
  • the change is larger than in the first embodiment, it is presumed that the layer structure is increased and the characteristic change is more likely to occur.
  • FIG. 15 shows the simulation results (isocontrast ratio contour lines) of the viewing angle characteristics of the liquid crystal display device according to the second embodiment.
  • the present embodiment is greatly improved as compared with the embodiment 1 and the comparative example 1, and it is possible to select the present embodiment depending on the requirement of the viewing angle characteristics. It is possible. However, with regard to the manufacturing cost, this embodiment is expected to be higher than the first embodiment.
  • FIG. 16 is a schematic cross-sectional view of the liquid crystal display device according to the third embodiment.
  • a front polarizer a first optical compensation layer as a positive C plate, a second optical compensation layer as a positive A plate, a third optical compensation layer as a ⁇ / 4 retardation plate, Seventh optical compensation layer as negative C plate, liquid crystal cell, eighth optical compensation layer as negative C plate, fourth optical compensation layer as ⁇ / 4 retardation plate, fifth as positive A plate
  • the viewing angle characteristics of the liquid crystal display device of Example 3 including the above were simulated.
  • the optical parameters of the respective members and the axial directions of the respective polarizers and the respective optical compensation layers are as shown in FIG.
  • the front polarizer corresponds to the first polarizer
  • the back polarizer corresponds to the second polarizer.
  • FIG. 17 shows the simulation results (isocontrast ratio contour lines) of the viewing angle characteristics of the liquid crystal display device according to the third embodiment.
  • the present embodiment has viewing angle characteristics with less omnidirectional bias as compared to Embodiment 1 and Comparative Example 1, and this embodiment can be used depending on the requirement of the viewing angle characteristics. It is also possible to choose However, with regard to the manufacturing cost, this embodiment is expected to be higher than the first embodiment.
  • One aspect of the present invention is a third polarizer functioning as a first polarizer (11), a first optical compensation layer (21), a second optical compensation layer (22), and a ⁇ / 4 retardation plate.
  • a fourth optical compensation layer (24) functioning as a four-retardation plate and a second polarizer (12) are provided in this order, and the first polarizer (11) has an absorption axis (11a)
  • the first optical compensation layer (21) has an in-plane retardation Re of 15 nm or less at an angle of substantially 90 ° to the absorption axis (12a) of the second polarizer (12).
  • the thickness direction retardation Rth is ⁇ 60 nm or less
  • the second optical compensation layer (22) has an in-plane retardation Re of 40 to 12 nm, satisfying 1 ⁇ Nz ⁇ 4, and the in-plane slow axis (22a) is substantially parallel to the absorption axis (11a) of the first polarizer (11), and the third In the optical compensation layer (23), the in-plane slow axis (23a) forms an angle of substantially 45 ° or 135 ° with the absorption axis (11a) of the first polarizer (11), and the liquid crystal
  • the cell (30) aligns liquid crystal molecules in the liquid crystal layer (33) substantially perpendicularly to the pair of substrates (31, 32) during black display
  • the fourth optical compensation layer ( 24) is a liquid crystal display in which the in-plane slow axis (24a) makes an angle of substantially 90 ° with the in-plane slow axis (23a) of the third optical compensation layer (23); It is also good.
  • Patent Document 3 may disclose a circularly polarizing plate using a positive C plate and a positive A plate
  • the slow axis of the positive A plate is a polarizer close to it. It is orthogonal to the absorption axis.
  • the first optical compensation layer (21) satisfying 1 ⁇ Nz ⁇ 4 has the in-plane slow axis (22a) of the first polarizer ( It is substantially parallel to the absorption axis (11a) of 11), and the design concept is different. The difference in the design concept makes it possible to reduce the number of used optical compensation layers in the liquid crystal display device (1).
  • the third and fourth optical compensation layers (23, 24) may each satisfy 1 ⁇ Nz ⁇ 2.4.
  • the liquid crystal display (1) includes an optical compensation layer other than the first to third optical compensation layers (21 to 23) between the first polarizer (11) and the liquid crystal cell (30).
  • an optical compensation layer other than the fourth optical compensation layer (24) may not be provided between the liquid crystal cell (30) and the second polarizer (12).
  • the first optical compensation layer (21) has a thickness direction retardation Rth of -200 to -100 nm
  • the second optical compensation layer (22) has an in-plane retardation Re of 60 to 110 nm.
  • 1 ⁇ Nz ⁇ 1.4 is satisfied
  • the third optical compensation layer (23) satisfies 1.4 ⁇ Nz ⁇ 2.4
  • the in-plane retardation Re is 40 to 120 nm, 1 ⁇ Nz ⁇ 4 is satisfied, and the in-plane slow axis (25a) substantially corresponds to the absorption axis (12a) of the second polarizer (12)
  • the first and sixth optical compensation layers (21, 26) each have a thickness direction retardation Rth of -150 to -80 nm, and the second and fifth optical compensation layers (22, 25) have The in-plane retardation Re is 40 to 90 nm, and 1 ⁇ Nz ⁇ 1.4, and the third optical compensation layer (23) satisfies 1.4 ⁇ Nz ⁇ 2.4, The fourth optical compensation layer (24) may satisfy 1.4 ⁇ Nz ⁇ 2.4.
  • the liquid crystal display device (1) can exhibit viewing angle characteristics with less omnidirectional bias.
  • the first and sixth optical compensation layers (21, 26) each have a thickness direction retardation Rth of -150 to -80 nm, and the second and fifth optical compensation layers (22, 25) have The in-plane retardation Re is 40 to 90 nm, and 1 ⁇ Nz ⁇ 1.4 is satisfied, and the third and fourth optical compensation layers (23, 24) are each 1 ⁇ Nz ⁇ 1. .4 may be satisfied.
  • the in-plane retardation Re of the third optical compensation layer (23) may be substantially the same as the in-plane retardation Re of the fourth optical compensation layer (24). Thereby, the liquid crystal display device (1) can maintain high contrast.
  • Each of the third and fourth optical compensation layers (23, 24) may have an in-plane retardation Re of 100 to 175 nm.
  • Liquid crystal display 2 Liquid crystal panel 2a: Display area 3: First circularly polarizing plate 4: Second circularly polarizing plate 11: First polarizer 11a: Absorption axis 12: Second polarizer 12a: Absorption Axis 21: first optical compensation layer 22: second optical compensation layer 22a: in-plane slow axis 23: third optical compensation layer ( ⁇ / 4 retardation plate) 23a: in-plane slow axis 24: fourth optical compensation layer ( ⁇ / 4 retardation plate) 24a: in-plane slow axis 25: fifth optical compensation layer 25a: in-plane slow axis 26: sixth optical compensation layer 27: seventh optical compensation layer 28: eighth optical compensation layer 30: liquid crystal cell 31, 32: substrate 33: liquid crystal layer

Landscapes

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

Abstract

La présente invention concerne un dispositif d'affichage à cristaux liquides qui permet de supprimer une détérioration de la qualité d'affichage dans des conditions environnementales difficiles et de supprimer le pelage et la rupture d'un solvant lorsque celui-ci est lié à une plaque de polarisation, et grâce auquel un panneau à cristaux liquides plus fin peut être obtenu. Ce dispositif d'affichage à cristaux liquides comprend, dans cet ordre, un premier polariseur, une première couche de compensation optique, une deuxième couche de compensation optique, une troisième couche de compensation optique fonctionnant comme plaque à différence de phase λ/4, une cellule à cristaux liquides, une quatrième couche de compensation optique fonctionnant comme plaque à différence de phase λ/4, et un second polariseur. La première couche de compensation optique est conçue de sorte que la différence de phase dans le plan Re est inférieure ou égale à 15 nm et la différence de phase Rth dans une direction d'épaisseur est inférieure ou égale à 60 nm. La deuxième couche de compensation optique est conçue de sorte que la différence de phase dans le plan Re est de 40 à 120 nm, la relation 1 ≤ Nz ≤ 4 est satisfaite, et l'axe lent dans le plan est sensiblement parallèle à l'axe d'absorption du premier polariseur. La cellule à cristaux liquides aligne des molécules de cristaux liquides sensiblement verticalement par rapport à une paire de surfaces de substrat tout en affichant le noir.
PCT/JP2018/024264 2017-07-04 2018-06-27 Dispositif d'affichage à cristaux liquides WO2019009145A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017131416 2017-07-04
JP2017-131416 2017-07-04

Publications (1)

Publication Number Publication Date
WO2019009145A1 true WO2019009145A1 (fr) 2019-01-10

Family

ID=64951029

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/024264 WO2019009145A1 (fr) 2017-07-04 2018-06-27 Dispositif d'affichage à cristaux liquides

Country Status (1)

Country Link
WO (1) WO2019009145A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112505817A (zh) * 2020-12-14 2021-03-16 深圳市盛波光电科技有限公司 一种用于近眼显示的偏光片及显示器件
US20220382091A1 (en) * 2019-10-01 2022-12-01 Sony Group Corporation Optical compensation element, liquid-crystal display device, and electronic apparatus
EP4339664A1 (fr) * 2022-09-16 2024-03-20 Samsung Display Co., Ltd. Dispositif d'affichage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006251050A (ja) * 2005-03-08 2006-09-21 Toshiba Matsushita Display Technology Co Ltd 液晶表示素子
JP2007003668A (ja) * 2005-06-22 2007-01-11 Nitto Denko Corp 液晶パネルおよびそれを用いた液晶表示装置
JP2008129176A (ja) * 2006-11-17 2008-06-05 Nippon Oil Corp 楕円偏光板およびそれを用いた垂直配向型液晶表示装置
JP2008176259A (ja) * 2006-12-22 2008-07-31 Nitto Denko Corp 積層光学フィルム、積層光学フィルムを用いた液晶パネルおよび液晶表示装置
JP2009300760A (ja) * 2008-06-13 2009-12-24 Nippon Oil Corp 楕円偏光板およびそれを用いた垂直配向型液晶表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006251050A (ja) * 2005-03-08 2006-09-21 Toshiba Matsushita Display Technology Co Ltd 液晶表示素子
JP2007003668A (ja) * 2005-06-22 2007-01-11 Nitto Denko Corp 液晶パネルおよびそれを用いた液晶表示装置
JP2008129176A (ja) * 2006-11-17 2008-06-05 Nippon Oil Corp 楕円偏光板およびそれを用いた垂直配向型液晶表示装置
JP2008176259A (ja) * 2006-12-22 2008-07-31 Nitto Denko Corp 積層光学フィルム、積層光学フィルムを用いた液晶パネルおよび液晶表示装置
JP2009300760A (ja) * 2008-06-13 2009-12-24 Nippon Oil Corp 楕円偏光板およびそれを用いた垂直配向型液晶表示装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220382091A1 (en) * 2019-10-01 2022-12-01 Sony Group Corporation Optical compensation element, liquid-crystal display device, and electronic apparatus
CN112505817A (zh) * 2020-12-14 2021-03-16 深圳市盛波光电科技有限公司 一种用于近眼显示的偏光片及显示器件
EP4339664A1 (fr) * 2022-09-16 2024-03-20 Samsung Display Co., Ltd. Dispositif d'affichage

Similar Documents

Publication Publication Date Title
JP5311605B2 (ja) 液晶パネルおよび液晶表示装置
KR100757718B1 (ko) 광학필름 및 액정표시장치
US20100045910A1 (en) Laminated optical film, and liquid crystal panel and liquid crystal display apparatus using the laminated optical film
JP5127046B2 (ja) 積層光学フィルム、積層光学フィルムを用いた液晶パネルおよび液晶表示装置
JP4228004B2 (ja) 透過型液晶表示装置
JP5259824B2 (ja) 液晶表示装置
JP2008134587A (ja) マルチギャップ構造を有する液晶セルを備える液晶パネル、及び液晶表示装置
JP2007206605A (ja) 液晶パネルおよび液晶表示装置
KR20080096753A (ko) 액정표시장치
JP2008129177A (ja) 透過型液晶表示装置
KR20080106409A (ko) 투과형 액정표시장치
JP2009075533A (ja) 楕円偏光板および液晶表示装置
JP2005099475A (ja) 光学フィルムおよび画像表示装置
WO2019009145A1 (fr) Dispositif d'affichage à cristaux liquides
JP2005321528A (ja) 液晶表示装置
JP2009053614A (ja) 積層光学フィルム、積層光学フィルムを用いた液晶パネルおよび液晶表示装置
US9618795B2 (en) Liquid crystal panel and liquid crystal display
JP2003015134A (ja) 液晶表示装置
JP4911777B2 (ja) 液晶パネルおよび液晶表示装置
JP2007225862A (ja) 液晶パネルおよび液晶表示装置
JP2012252084A (ja) 液晶パネルおよび液晶表示装置
JP5084029B2 (ja) 積層光学フィルム、積層光学フィルムを用いた液晶パネルおよび液晶表示装置
JP4761399B2 (ja) 積層光学フィルム、積層光学フィルムを用いた液晶パネルおよび液晶表示装置
JP2007114762A (ja) 光学補償層付偏光板、光学補償層付偏光板を用いた液晶パネル、液晶表示装置、および画像表示装置
JP2008139806A (ja) 積層光学フィルム、積層光学フィルムを用いた液晶パネルおよび液晶表示装置

Legal Events

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

Ref document number: 18828418

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18828418

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP