WO2007091477A1 - カラーフィルター付き液晶セル基板、及び液晶セル、及び液晶表示装置 - Google Patents
カラーフィルター付き液晶セル基板、及び液晶セル、及び液晶表示装置 Download PDFInfo
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- WO2007091477A1 WO2007091477A1 PCT/JP2007/051676 JP2007051676W WO2007091477A1 WO 2007091477 A1 WO2007091477 A1 WO 2007091477A1 JP 2007051676 W JP2007051676 W JP 2007051676W WO 2007091477 A1 WO2007091477 A1 WO 2007091477A1
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- liquid crystal
- crystal cell
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- color
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/288—Filters employing polarising elements, e.g. Lyot or Solc filters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
- G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
- G02F1/133565—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements inside the LC elements, i.e. between the cell substrates
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133631—Birefringent elements, e.g. for optical compensation with a spatial distribution of the retardation value
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133637—Birefringent elements, e.g. for optical compensation characterised by the wavelength dispersion
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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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1393—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
Definitions
- Liquid crystal cell substrate with color filter, liquid crystal cell, and liquid crystal display device Liquid crystal cell substrate with color filter, liquid crystal cell, and liquid crystal display device
- the present invention relates to a liquid crystal cell substrate with a color filter, a liquid crystal cell, and a liquid crystal display device used for a color liquid crystal display device.
- liquid crystal display devices have been widely used in monitors such as notebook computers and televisions, and in particular, their use in large-sized televisions has been rapidly expanding.
- a liquid crystal display device when viewed from an oblique direction, it is important to have a high contrast ratio and a small color change (increase the black display level in a black display state). In particular, improvement of viewing angle characteristics in color display liquid crystal display devices that have been widely used in recent years is an important issue.
- a liquid crystal display device includes a liquid crystal cell and polarizing plates arranged on both sides of the liquid crystal cell so that the absorption axis is substantially vertical or substantially parallel.
- a transparent substrate in which liquid crystal driving electrode elements are regularly arranged in a matrix and a transparent substrate facing the transparent substrate are held at regular intervals via a spacer.
- a liquid crystal material is filled between the pair of transparent substrates.
- a color filter is formed on the viewing side of the transparent substrate on which the electrode elements are provided.
- the liquid crystal cell filled with the liquid crystal material itself has birefringence. For this reason, when viewed from an oblique direction, the liquid crystal cell has a reduced black display level due to light leakage.
- an optical compensation layer also referred to as a compensation plate, a retardation plate, a viewing angle widening film, etc.
- the present situation is that the reduction of the black display level over a wide viewing angle can be eliminated by simply providing the optical compensation layer.
- Patent Document 1 Japanese Patent Application Publication 2001-242460
- Japanese Patent Application Publication 2001-242460 Japanese Patent Application Publication 2001-242460
- the in-plane phase difference And of the blue region of the color filter is made larger than that of the green region and the red region. This increases the rate of blue light leakage and offsets the yellow color that is complementary to blue overall.
- the method of Patent Document 1 cannot improve the black display level in a wide viewing angle.
- Patent Document 2 Japanese Patent Application Publication No. 2002-122866 discloses a TN liquid crystal display device in which a retardation layer having birefringence is provided between two substrates filled with a liquid crystal layer. ing. However, with this method, a phase difference layer must be provided for each color of the color filter.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-242460
- Patent Document 2 JP 2002-122866
- An object of the present invention is to suppress color change due to light leakage in a black display state when viewed from an oblique direction, and to provide a liquid crystal with a color filter that can realize a good image display in a wide viewing angle.
- a cell substrate, a liquid crystal cell, and a liquid crystal display device are provided.
- the present invention includes a transparent substrate and a color filter having three color regions of blue, green, and red, and the following formula (1) in the blue region, the green region, and the red region of the color filter:
- a liquid crystal cell substrate with a color filter that satisfies the following formula (2) or (3) is provided.
- nx and ny are the refractive indices in the plane of each color area (where nx ⁇ ny), nz is the refractive index in the thickness direction of each color area, and d is the thickness of each color area.
- Rth (B ) Is the thickness direction retardation value in the blue region at a wavelength of 450 nm
- Rth (G) is the thickness direction retardation value in the green region at a wavelength of 546 nm
- Rth (R) is the wavelength in the red region at 633 nm. Represents the thickness direction retardation value of each.
- the present invention also provides a liquid crystal cell comprising the above-described liquid crystal cell substrate with a color filter and an optical compensation layer.
- the optical compensation layer includes the liquid crystal cell that is at least one of a compensation layer having a relationship of nx ⁇ ny> nz and a compensation layer having a relationship of nx> nz> ny. provide.
- nx is the refractive index in the slow axis direction in the plane
- ny is the refractive index in the fast axis direction in the plane
- nz is the refractive index in the thickness direction.
- liquid crystal cell wherein the liquid crystal cell is a VA (vertical alignment) type.
- the present invention also provides a liquid crystal display device having the liquid crystal cell.
- the liquid crystal cell with a color filter of the present invention can suppress a color change due to light leakage in a black display state when viewed in an oblique direction. Therefore, by using the liquid crystal cell with one color filter of the present invention, it is possible to provide a liquid crystal display device capable of realizing good image display over a wide viewing angle.
- FIG. 1 is a reference graph showing wavelength dispersion of a conventional liquid crystal cell with a color filter.
- FIG. 2 is a reference graph showing wavelength dispersion of the liquid crystal cell with a color filter of the present invention.
- FIG. 3 is a reference graph showing wavelength dispersion of the liquid crystal cell with a color filter of the present invention.
- FIG. 4 is a reference graph showing wavelength dispersion of the liquid crystal cell with a color filter of the present invention.
- FIG. 5 is a reference graph showing wavelength dispersion of a liquid crystal cell with a color filter of the present invention.
- FIG. 6 is a partially omitted reference sectional view showing the liquid crystal cell of the present invention.
- Liquid crystal modes of liquid crystal display devices include VA type, IPS type, TN type, STN type, and OCB type.
- the liquid crystal material is substantially perpendicular to the substrate when there is no voltage.
- the black display viewed from the front is equivalent to the characteristics of the cross-cor polarizer, and a very high contrast can be realized.
- a VA liquid crystal layer filled with the liquid crystal material in a substantially vertical shape exhibits a birefringence of nz> nx ny (so-called positive C plate), and thus causes a phase difference in the thickness direction. Therefore, when the VA liquid crystal display device is viewed from an oblique direction, light leakage occurs, and the black display level is lowered when the black display state is reached.
- the chromatic dispersion of the refractive index of the substance becomes a curved shape with a larger slope as the wavelength becomes shorter (this Is derived from Kosher's dispersion formula).
- the chromatic dispersion of the phase difference value of a substance is also normally in accordance with this, and when the graph is plotted with the wavelength ( ⁇ ) as the horizontal axis and the phase difference value as the vertical axis, the absolute value of the magnitude of the slope becomes a curve that becomes larger as the wavelength is shorter. .
- the chromatic dispersion of the phase difference value is a continuous (monotonically increasing or monotonically decreasing) curve at each wavelength, and the absolute value of the slope of this chromatic dispersion curve is larger on the shorter wavelength side and on longer wavelengths.
- the curve becomes smaller toward the side (hereinafter, such a wavelength dispersion curve is sometimes referred to as a “Kosi dispersion curve”).
- the slope is the slope of the tangent line drawn on the chromatic dispersion curve.
- Rth [ ⁇ (nx + ny) Z2 ⁇ —nz] Xd.
- This Rth chromatic dispersion is also the same as the Cauchy dispersion curve, as described above. Note that nx and ny are in-plane refractive indices (where nx ⁇ ny), nz is the refractive index in the thickness direction, and d is the thickness.
- the Rth of a VA liquid crystal layer with a refractive index of nz> nx ⁇ ny (so-called positive C plate) is negative, and its chromatic dispersion is positive dispersion.
- the Rth of a so-called negative C plate with a refractive index of nz to nx ⁇ ny is positive, and its chromatic dispersion is positive dispersion.
- Positive dispersion means that the absolute value of Rth (IRth I) shows a chromatic dispersion curve that is larger as the wavelength is shorter.
- Inverse dispersion refers to a chromatic dispersion curve in which the absolute value of Rth is smaller at shorter wavelengths.
- an optical compensation layer in which the absolute value of Rth at each wavelength is substantially equal is a simple method.
- An example of such an optical compensation layer is a so-called negative C plate of nz and nx ⁇ ny.
- the Rth of the VA liquid crystal cell with a color filter is influenced by the Rth of each color region of the color filter. It has been found that light leakage cannot be prevented simply by providing the optical compensation layer that cancels Rth of the liquid crystal cell without considering this effect!
- the color filter is divided into a blue region through which blue light is transmitted, a green region through which green light is transmitted, and a red region through which red light is transmitted. . Since each color region exhibits independent optical characteristics, different Rth can be generated for each color region.
- liquid crystal cell In a liquid crystal cell with a color filter (hereinafter sometimes abbreviated as “liquid crystal cell”), light is emitted from the liquid crystal layer through the color filter. Therefore, the Rth of the liquid crystal cell is a combination of the Rth of the liquid crystal layer and the Rth of the color filter.
- the chromatic dispersion of the Rth of the VA liquid crystal cell is obtained by adding the Rth chromatic dispersion of the VA liquid crystal layer to the Rth of the center wavelength of each color region (the wavelength with the maximum transmittance of each color) Become.
- the center wavelength of the blue region is 450 nm
- the center wavelength of the green region is 546 nm
- the center wavelength of the red region is 633 nm.
- Rth of wavelength 450nm in the blue region is Rth (B)
- Rth of wavelength 546nm in the green region is Rth (G)
- Rth of wavelength 633nm in the red region is Rth (R) .
- Rth (B) is negative
- Rth (G) is positive
- Rth (R) is negative is taken as an example. In this case, as shown in Fig.
- the chromatic dispersion of the Rth of the VA liquid crystal cell which is the combined force of Rth of each color region and Rth of the VA liquid crystal layer, is a long wavelength in the wavelength from the blue region to the green region.
- a general-purpose optical compensation layer cannot compensate for a liquid crystal cell having a chromatic dispersion curve having an inflection point where the inclination is reversed.
- compensation of the compensated object can be achieved by providing an optical compensation layer having a sign opposite to that of Rth of the compensated object and having substantially the same absolute value of Rth at each wavelength. Therefore, when compensating for the liquid crystal cell having the inflection point, an optical compensation layer showing a wavelength dispersion curve having the inflection point must be provided.
- the Rth wavelength dispersion of a general-purpose optical compensation layer is larger as the absolute value of the inclination is shorter at the shorter wavelength side than the above-mentioned Kosher dispersion formula. Therefore, it is practically difficult to compensate using an optical compensation layer having an inflection point at which the slope of the Rth wavelength dispersion curve is reversed.
- the Rth of the color filter has not been considered at all. Therefore, the compensation for the liquid crystal cell could not be performed using a general-purpose optical compensation layer (for example, a negative C plate), and the reduction of the black display level of the liquid crystal display device could not be suppressed.
- a general-purpose optical compensation layer for example, a negative C plate
- the present invention provides a liquid crystal cell substrate with a color filter having a transparent substrate and a color filter having three color regions of blue, green, and red.
- the Rth of the region is configured to satisfy the following formula (2) or (3).
- nx and ny are the refractive indices in the plane of each color area (where nx ⁇ ny), nz is the refractive index in the thickness direction of each color area, and d is the thickness of each color area.
- Rth (B) is the thickness direction retardation value at a wavelength of 450 nm in the blue region
- Rth (G) is the thickness direction retardation value at the wavelength of 546 nm in the green region
- Rth (R) is in the red region. Represents the thickness direction retardation value at 633 nm.
- the Rth chromatic dispersion of the liquid crystal cell is a continuous curve (monotonically increasing or monotonically decreasing) at each wavelength, and the absolute value of the magnitude of the inclination becomes a larger curve as the wavelength is shorter.
- the liquid crystal cell can be compensated by using a general-purpose optical compensation layer according to the above-mentioned Kosher dispersion curve. As a result, light leakage in the black display state of the liquid crystal display device is prevented, and a liquid crystal display device having a high black display level when viewed from an oblique direction can be provided.
- the wavelength 450 nm, wavelength 546 nm, and wavelength 633 nm were used as a reference because the light of each color in each color region had the center wavelength with the highest transmittance. It is.
- Rth (B), Rth (G), and Rth (R) of each color region it is possible to relatively easily form each color region that satisfies the above relationship.
- Rth (B)> Rth (G)> Rth (R) is, for example, as shown in FIG. 2, Rth (B), Rth (G), Rth (R) is all minus (same sign), and as shown in FIG. 3, Rth (B), Rth (G), Rth (R) are all plus (same sign), and other V is not shown.
- Rth (B) and Rth (G) are positive and Rth (R) is negative.
- Rth (B) ⁇ Rth (G) ⁇ Rth (R) is, for example, Rth (B), Rth (G ) And Rth (R) are all negative (same sign), as shown in Fig. 5, Rth (B), Rth (G) and Rth (R) are all positive (same sign), and other figures are not shown! , But Rth (B) and Rth (G) are negative and Rth (R) is positive.
- the Rth wavelength dispersion of the VA type liquid crystal cell with the Luller filter is also a force that is the combined power of Rth of the color filter that satisfies the formula (3) and Rth of the VA type liquid crystal layer This is Kosi's dispersion curve.
- the VA type liquid crystal cell satisfying the formula (2) or the formula (3) is a Cauchy dispersion curve
- the VA type liquid crystal cell is a general-purpose optical compensation layer. (Eg negative C plate) can be used to compensate.
- Rth (B), Rth (G), and Rth (R) of the color filter are not particularly limited on condition that the above formula (2) or formula (3) is satisfied.
- I Rth (B) -Rth (G) I or I Rth (G) — Rth (R) I force If it is too large, the Rth wavelength dispersion curve force of the synthesized VA liquid crystal cell It may not fit the dispersion curve.
- Rth (B), Rth (G), and Rth (R) are appropriately designed in consideration of the Rth wavelength dispersion curve of the VA liquid crystal cell to be synthesized.
- the liquid crystal cell substrate with a color filter of the present invention adopts those of various conventionally known structures, provided that Rth of each color region of the color filter is in the relationship of the above formula (2) or formula (3). be able to.
- FIG. 6 shows a configuration example of the liquid crystal cell of the present invention.
- [0028] 1 represents a liquid crystal cell substrate with a color filter.
- the liquid crystal cell substrate 1 with a color filter has a transparent substrate 2 disposed on the viewing (display) side and a color filter 3 formed on the transparent substrate 2.
- the liquid crystal cell 10 shows a liquid crystal cell.
- the liquid crystal cell 10 includes a liquid crystal cell substrate 1 with a color filter, the other transparent substrate 4 opposed to the substrate 1 via a spacer (not shown), a transparent substrate 2 with a color filter, and the other And a liquid crystal material filled in the liquid crystal layer 5 formed between the transparent substrates 4.
- the liquid crystal cell 10 is used by being incorporated in a liquid crystal display device.
- the color filter 3 has a blue region 31, a green region 32, and a red region 33 formed in a predetermined pattern (such as a stripe shape) on the transparent substrate 2.
- a black matrix 34 having a predetermined pattern is formed between the color regions 31, 32, 33.
- an electrode element such as a TFT substrate for driving a liquid crystal material is provided.
- an optical compensation layer 6 is provided on the viewing side of the transparent substrate 1 with a color filter.
- the optical compensation layer 6 can also be provided on the other transparent substrate 4 side so as to sandwich the liquid crystal cell 10 as shown in FIG. 6 (b).
- 7 shows a pair of polarizing plates provided on both sides of the liquid crystal cell 10 (outside of the optical compensation layer 6). The pair of polarizing plates 7 and 7 are arranged so that their absorption axes are substantially vertical or substantially parallel.
- the transparent substrate 2 is not particularly limited, and is a transparent glass plate such as soda-lime glass, low alkali borosilicate glass, non-alkali aluminoborosilicate glass; optical material such as polycarbonate, methyl polymethacrylate, polyethylene terephthalate, etc.
- a transparent flexible material having flexibility, such as a resinous resin board, can be used.
- the liquid crystal layer 5 has a VA (vertical alignment) type in which the liquid crystal material is aligned substantially vertically with respect to the transparent substrate at no voltage from the viewpoint of high contrast and the like that can be filled with conventionally known liquid crystal materials. It is preferable to use a liquid crystal material. As the liquid crystal material, a rod-like liquid crystal can be used.
- the dry film thicknesses of the blue region 31, the green region 32, and the red region 33 are usually 0.2 to LO / zm, and preferably about 0.2 to 5 / ⁇ ⁇ .
- the Rth of each color area is controlled. One way to do this is to have different layer thicknesses for each color area.
- Each color region of the color filter is formed by applying a colored composition to the transparent substrate on the viewing side.
- the coloring composition has a transparent carrier and a dye carrier that also has a precursor power thereof, and a dye, and preferably further contains a photopolymerization initiator.
- the transparent resin preferably has a transmittance of 8 to all wavelengths in the visible light region of 400 to 700 nm.
- It is 0% or more, more preferably 95% or more.
- Transparent resin includes thermoplastic resin, thermosetting resin, photosensitive resin, and the like.
- the precursor of the transparent resin includes a monomer or an oligomer that is cured by irradiation to produce a transparent resin. These can be used alone or in combination of two or more.
- thermoplastic resin examples include petital resin, styrene monomaleic acid copolymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyacetic acid butyl.
- Polyurethane resin polyester resin, acrylic resin, alkyd resin, polystyrene, polyamide resin, rubber resin, cyclized rubber resin, celluloses, polyethylene, polybutadiene, polyimide resin, etc. It is done.
- thermosetting resin examples include epoxy resin, benzoguanamine resin, rosin-modified maleic acid resin, rosin-modified fumaric acid resin, melamine resin, urea resin, phenol resin and the like.
- the photosensitive resin examples include a resin in which a photocrosslinkable group such as a (meth) atalyloyl group or a styryl group is introduced into the linear polymer.
- the resin is a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group or an amino group, and a (meth) acrylic compound or a key having a reactive substituent such as an isocyanate group, an aldehyde group or an epoxy group. Examples include those obtained by reacting with an acid or the like.
- the photosensitive resin has a linear polymer containing an acid anhydride such as styrene maleic anhydride copolymer and ⁇ -olefin maleic anhydride copolymer, and has a hydroxyl group such as hydroxyalkyl (meth) atalylate.
- an acid anhydride such as styrene maleic anhydride copolymer and ⁇ -olefin maleic anhydride copolymer
- a hydroxyl group such as hydroxyalkyl (meth) atalylate.
- a half-esterified product using a (meth) acrylic compound can also be used.
- Monomers and oligomers of the above precursors include methyl (meth) acrylate, ethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, cyclo Hexyl (meth) acrylate, ⁇ -carboxyethyl (meth) acrylate, polyethylene glycol di (meth) acrylate, 1, 6-hexanediol di (meth) acrylate, triethylene glycol di (meth) ate , Tripropylene glycol di (meth) acrylate, trimethylol propane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, 1,6-hexanediol diglycidyl ether di (meth) acrylate, bisphenol ⁇ Diglycidyl ether di (meth) acrylate Neopentylglycol diglycidyl ether di (meth)
- coloring matter contained in the coloring composition examples include organic or inorganic pigments. These may be used alone or in combination of two or more.
- organic pigments are usually used because pigments with high color developability and high heat resistance are preferred, particularly pigments with high heat decomposition resistance.
- red pigment used in the red photosensitive coloring composition for forming the red region examples include CI Pigment Red 1, 2, 3, 7, 9, 14, 41, 48: 1, 48: 2. 48: 3, 48: 4, 81: 1, 81: 2, 81: 3, 97, 122, 123, 146, 149, 168, 177, 178, 179, 180, 184, 185, 187, 192, 200 202, 208, 210, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 246, 254, 255, 264, 272, 279, etc.
- a yellow pigment and an orange pigment can be used in combination with the red photosensitive coloring composition.
- examples of the green pigment used in the green photosensitive coloring composition for forming the green region include CI Pigment Green 7, 10, 36, 37, and the like.
- a yellow pigment can be used in combination with the green photosensitive coloring composition.
- blue pigment used in the blue photosensitive coloring composition for forming the blue region examples include CI Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, and 15: 6. 16, 22, 60,
- blue photosensitive coloring composition examples include C. I. Pigment Violet 1, 19, 23, 27,
- Examples thereof include carbon black, vanillin black, anthraquinone black pigment, perylene black pigment, specifically, CI Pigment Black 1, 6, 7, 12, 20, 31 and the like.
- the black photosensitive coloring composition a mixture of a red pigment, a blue pigment, and a green pigment is used.
- carbon black is preferable because of its price and light shielding properties.
- the carbon black may be surface-treated with rosin or the like.
- a blue pigment and a purple pigment can be used together in a black photosensitive coloring composition.
- Carbon black having a specific surface area of 50 to 200 m 2 Zg by the BET method is preferred from the viewpoint of the shape of the black matrix. This is because if carbon black with a specific surface area of less than 50 m 2 Zg is used, the black matrix shape may be deteriorated. On the other hand, when carbon black with a specific surface area of greater than 200 m 2 / g is used, the dispersion aid is excessively adsorbed on the carbon black, and a large amount of dispersion aid must be added in order to develop various physical properties. This is because.
- carbon black preferably has an oil absorption of dibutyl phthalate (hereinafter referred to as "DBP") of 120ccZl00g or less.
- DBP dibutyl phthalate
- the average primary particle size of carbon black is preferably 20 to 50 nm. flat This is because when carbon black having an average primary particle size of less than 20 nm is used, it is difficult to disperse it at a high concentration, and it is difficult to obtain a photosensitive black composition having good temporal stability. On the other hand, if carbon black having an average primary particle size of more than 50 nm is used, the black matrix shape may be deteriorated.
- examples of inorganic pigments include metal oxide powders such as bengara (red iron oxide (III)), cadmium red, ultramarine blue, bitumen, acid chrome green, cobalt green, amber, titanium black, and synthetic iron black. , Metal sulfide powder, metal powder and the like.
- Inorganic pigments are used in combination with organic pigments in order to ensure good coatability, sensitivity, developability, etc. while balancing saturation and lightness.
- the coloring composition of the present invention may contain a dye within a range that does not reduce heat resistance for color matching.
- Each coloring composition may contain a solvent. This is because the dye is sufficiently dispersed in the dye carrier and coated on the transparent substrate so as to have a predetermined dry film thickness. If a colored composition containing a solvent is used, each color region or black matrix having a predetermined thickness can be easily formed.
- Solvents include, for example, cyclohexanone, ethyl acetate sorb acetate, butyl cellosolve acetate, 1-methoxy-2-propyl acetate, diethylene glycol dimethyloleneateol, ethinorebenzene, ethyleneglycololecinoleethenole, xylene, ethylacetate sorb, methyl-n
- Examples thereof include amyl ketone, propylene glycol monomethyl ether toluene, methyl ethyl ketone, ethyl acetate, methanol, ethanol, isopropyl alcohol, butanol, isoptyl ketone, and petroleum solvents. These may be used alone or in combination of two or more.
- the coloring composition may be a dye or two or more kinds of dyes that are finely dispersed in a dye carrier and a solvent, preferably together with a photopolymerization initiator.
- the components constituting the coloring composition can be finely dispersed using various dispersing means such as a three-roll mill, a two-roll mill, a sand mill, an adder, and an attritor.
- the photosensitive coloring composition containing two or more dyes can be produced by mixing finely dispersed dyes in a dye carrier and a solvent separately.
- the oleaginous pigment dispersant When dispersing the dye in the dye carrier and the solvent, the oleaginous pigment dispersant, interface A dispersing aid such as an activator or a pigment derivative can be contained.
- the dispersion aid is excellent in dispersing the pigment and has a great effect of preventing reaggregation of the pigment after dispersion. For this reason, a photosensitive coloring composition obtained by dispersing a pigment in a dye carrier and a solvent using a dispersion aid can form a color filter having excellent transparency.
- the slag type pigment dispersant has a pigment affinity part having a property of adsorbing to the pigment and a part compatible with the dye carrier, and adsorbs to the pigment to disperse the pigment on the dye carrier. It works to stabilize.
- oil-based pigment dispersants examples include polyurethanes, polycarboxylic acid esters such as polyatarylates, unsaturated polyamides, polycarboxylic acids, polycarboxylic acid (partial) amine salts, polycarboxylic acid ammonium salts, and polycarboxylic acids.
- Alkylamine salts polysiloxanes, long-chain polyaminoamide phosphates, hydroxyl group-containing polycarboxylic acid esters, their modified products, and poly (lower alkylene imines) by reaction with polyesters with free carboxyl groups
- Oil-based dispersants such as formed amides and salts thereof; (meth) acrylic acid styrene copolymer, (meth) acrylic acid (meth) acrylic acid ester copolymer, styrene maleic acid copolymer, polyvinyl alcohol, polyvinyl Water-soluble resin such as pyrrolidone water-soluble polymer compounds; polyester-based; modified polyata Rate system; ethylene oxide Z propylene O hexa Id additional I ⁇ thereof; phosphate ester-based, and the like. These may be used alone or in combination of two or more.
- Surfactants include sodium lauryl sulfate, polyoxyethylene alkyl ether sulfate, sodium dodecylbenzene sulfonate, alkali salt of styrene acrylic acid copolymer, sodium stearate, sodium alkylnaphthalene sulfonate, alkyl diphenol- Sodium ether disulfonate, monoethanolamine lauryl sulfate, triethanolamine lauryl sulfate, ammonium lauryl sulfate, monoethanolamine stearate, sodium stearate, sodium lauryl sulfate, styrene-acrylic acid copolymer
- Phenol surfactants such as monoethanolamine and polyoxyethylene alkyl ether phosphates; polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, polyoxyethylene Lennonyl phenyl ether, polyoxyethylene alkyl ether phosphate, polyoxyethylene
- a dye derivative is a compound in which a substituent is introduced into an organic dye, and the organic dye is not generally called a dye, for example, a pale yellow aromatic polycycle such as naphthalene or anthraquinone Also included are compounds.
- dye derivatives include Japanese Patent Application Publication No. 63-305173, Japanese Patent Application Publication No. 57-15620, Japanese Patent Application Publication No. 59-40172, Japanese Patent Application Publication No. 63-17102. No. 5-9469 and Japanese Patent Application Publication No. 5-9469. These can be used alone or in combination of two or more.
- Examples of the photopolymerization initiator include 4 phenoxydichloroacetophenone, 4-t-butyldichloroacetophenone, jetoxyacetophenone, 1- (4-isopropylphenol) — 2 —Hydroxy 2-methylpropane 1-one, 1-hydroxycyclohexyl phenol ketone, 2-benzyl-1-2-dimethylamino 1- (4-morpholinophenol) butane—acetophenone compounds such as 1-one; benzoin Benzoin compounds such as benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzyl dimethyl ketal; benzophenone, benzoylbenzoic acid, benzoylbenzoic acid methyl, 4-phenol penzophenone, hydroxybenzophenone, acrylate Nzophenone, 4-benzoyl-4'-methyl Benzophenone compounds such as phenol sulfide, 3, 3 '
- photopolymerization initiators can be used alone or in combination of two or more.
- the amount of the photopolymerization initiator used is preferably 0.5 to 45% by mass, more preferably 3 to 30% by mass, and still more preferably 4 to 10% by mass, based on the total solid content of the photosensitive coloring composition. It is.
- a sensitizer can be used in combination.
- sensitizers triethanolamine, methyljetanolamine, triisopropanolamine, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, 2-dimethylaminoethyl benzoate, 4 dimethylamino 2-ethylhexyl benzoate, N, N-dimethylbalatoluidine, 4,4'bis (dimethylamino) benzophenone, 4,4'bis (jetylamino) benzophenone, 4,4,1bis (ethylmethylamino) benzophenone, etc. And the like.
- These sensitizers can be used alone or in combination of two or more.
- the sensitizer is preferably 4,4'-bis (dimethylamino) benzophenone or 4,4, -bis (jetylamino) benzophenone, more preferably 4,4, -bis (jetylamino) benzophenone. Used.
- the amount of the sensitizer used is 0.5 to 55 mass based on the total amount of the photopolymerization initiator and the sensitizer. % Is more preferably 2.5 to 40% by mass, and still more preferably 3.5 to 25% by mass.
- the photosensitive coloring composition may contain a compound that functions as a chain transfer agent.
- examples of the compound include polyfunctional thiols.
- the polyfunctional thiol may be a compound having two or more thiol groups.
- hexanedithionore, decandiothionore, 1,4 butanediolebisthiopropionate, 1,4 butanediolbisiote Glycolate ethylene glycol bisthioglycolate, ethylene glycol bisthiopropionate, trimethylolpropane tristyglycolate, trimethylolpropane tristhiopropionate, trimethylolpropane tris (3-mercaptobutyrate), Pentaerythritol tetrakisthioglycolate, pentaerythritol tetrakisthiopropionate, trimercaptopropionic acid tris (2-hydroxide) isocyanurate, 1,4 dimethylmercaptobenzene, 2, 4, 6 trimercapto-s tri Jin, 2-(N, N-Jibuchiruamino
- the amount of the polyfunctional thiol used is preferably 0.1 to 30% by mass, more preferably 1 to 20% by mass, based on the total solid content of the photosensitive coloring composition.
- the photosensitive coloring composition can be prepared in the form of a solvent development type or alkali development type colored resist material.
- the colored resist material has a dye dispersed in a colored composition containing a thermoplastic resin, a thermosetting resin or a photosensitive resin, a monomer, a photopolymerization initiator, and a solvent.
- dye in the ratio of 5-70 mass% on the basis of the total amount of solids of the photosensitive coloring composition. More preferably, the pigment is contained in a proportion of 20 to 50% by mass, and the remainder is substantially constituted by the resin binder provided by the pigment carrier.
- the photosensitive coloring composition may be coarse particles of 5 m or more, preferably coarse particles of 1 ⁇ m or more, more preferably 0.5 ⁇ m by means of centrifugation, sintered filter, membrane filter or the like. It is preferable to remove the coarse particles and mixed dust.
- Each color region and black matrix is formed by solvent development type or alkali development type.
- a photosensitive coloring composition prepared as a color resist material is applied on a transparent substrate so as to have a predetermined dry thickness. Examples of the coating method include spray coating, spin coating, slit coating, and roll coating. If necessary, the dried film is exposed to ultraviolet rays through a mask having a predetermined pattern provided in contact with or not in contact with the film. Thereafter, the developer is sprayed with a force immersed in a solvent or an alkaline developer or spraying to remove an uncured portion of the film to form a desired pattern. Furthermore, in order to accelerate the polymerization of the colored resist material, heating may be performed as necessary.
- a color filter can be formed on a transparent substrate by sequentially forming a black matrix and each color region on the transparent substrate. According to a powerful photolithography method, each color region and black matrix can be formed with higher accuracy than the printing method.
- an aqueous solution such as sodium carbonate or sodium hydroxide is used as the alkaline developer.
- organic alkalis such as dimethylbenzylamine and triethanolamine can also be used as the developer.
- defoaming agents and surfactants can be added to the developer.
- a shower development method As a development processing method, a shower development method, a spray development method, a dip (immersion) development method, a paddle (liquid accumulation) development method, or the like can be applied.
- the colored resist material is applied and dried, and then water-soluble or alkali-soluble resin (for example, polybulal alcohol or water-soluble acrylic resin) is applied and dried to prevent polymerization inhibition by oxygen. After the film to be formed is formed, it is necessary to perform UV exposure.
- water-soluble or alkali-soluble resin for example, polybulal alcohol or water-soluble acrylic resin
- Rth (B), Rth (G) and Rth (R) satisfy the above formula (2) or formula (3), so that the blue region, the green region, A red area is formed.
- a method for controlling Rth (B), Rth (G), and Rth (R) in each color region will be described below.
- Examples of the method include changing the Rth of the transparent resin of the dye carrier in the red region, the green region, and the blue region.
- the transparent resin of the dye carrier used in at least one color region is different from the transparent resin of the dye carrier in other color regions.
- Transparent resin with is used.
- transparent resins having different Rths are used as transparent resins for the dye carriers used in the red region, the green region, and the blue region, respectively.
- the Rth of the transparent resin as a simple pigment is, for example, a) a method for controlling the viscosity of the resin, b) a method for controlling the ⁇ of the resin, c) a method for controlling the thickness of the resin. It can be controlled by each method.
- One transparent resin having a different molecular weight distribution is a large Rth V transparent resin, and the other is a small Rth transparent resin.
- a cured product with controlled Rth can be obtained by crosslinking the resin with electron beam, heat, or other methods.
- a transparent resin having a molecular weight higher than that of a green region or a red region is used as a pigment carrier of a coloring composition that forms a blue region.
- a transparent resin having a molecular weight higher than that of the dye carrier in the red region may be used as the pigment carrier of the coloring composition that forms the green region.
- a) method for controlling the viscosity at the time of dissolution of the resin two types of transparent resins having different intermolecular interactions are used.
- One of the transparent resins with different intermolecular interactions is a transparent resin with a large Rth and the other is a transparent resin with a small Rth.
- the resin having a functional group in the side chain is compared with a resin having no functional group, the resin having a functional group has higher intermolecular interaction and thus has a higher viscosity. For this reason, for the same reason as described above, a relatively large Rth occurs in the direction of the resin having a functional group.
- Rth can also be controlled by a method in which a part of the resin is replaced with a hydrogen group or a hydrocarbon group with a fluorine group.
- polyimide transparent resin
- Japanese Patent No. 3211108, Japanese Patent Application Publication No. 2-14365, Japanese Patent Application Publication No. 2-14366, Japanese Patent No. 2785 359, Japanese Patent Fluorine-containing crosslinkable polyimides disclosed in Japanese Patent Application Publication No. 2003-520878 can be suitably used.
- These publications disclose polyamides having similar structures and various polyimides in which hydrogen or hydrocarbon groups are substituted with fluorine.
- the fluorine-substituted polyimide has a small Rth.
- ⁇ of the resin As a method for controlling ⁇ of the resin, first, it is possible to exemplify using different types of transparent resin.
- epoxy resin generally has a smaller Rth force S than polyimide resin.
- Rth of each color region can be controlled by using different transparent resins as the transparent resin of the dye carrier of the coloring composition of each color region.
- the Rth of the coagulant is reduced by substituting the side chain with an element having a higher electroabsorption property. be able to.
- the Rth of rosin can be increased.
- a method of controlling the thickness of the resin is to control Rth of each color region to a desired phase difference value by simply changing the film thickness of each color region. For example, if the film thickness of a certain color region is increased, the Rth of that color region can be increased.
- the optical compensation layer has the opposite sign of Rth of the liquid crystal cell and the absolute value of Rth at each wavelength of the optical compensation layer so as to eliminate the Rth wavelength dispersion of the VA liquid crystal cell.
- a liquid crystal cell having a wavelength dispersion substantially equal to Rth of each wavelength is appropriately selected and used.
- optical compensation layer used in the VA type liquid crystal cell examples include an optical compensation layer (so-called negative C plate) having a relationship of nx ⁇ ny> nz, and a relationship of n X >nz> ny
- An optical compensation layer whose refractive index is controlled in the thickness direction can be exemplified.
- Nx and ny indicate in-plane refractive indexes (nx> ny), nx indicates the refractive index in the slow axis direction, ny indicates the refractive index in the fast axis direction, and nz indicates the refractive index in the thickness direction.
- An optical compensation layer with a refractive index controlled in the thickness direction having a relationship of nx> nz> ny has a blue screen or the like due to the fact that the axis of the polarizer deviates from the cross-coll force when viewed in an oblique direction. It has the effect of preventing coloring.
- the optical compensation layer having the relationship of nx ⁇ ny> nz is preferably disposed adjacent to the liquid crystal cell. In the present invention, the optical compensation layer may be a single layer or two or more different layers.
- Examples of the material forming the negative C plate include non-liquid crystal polymers described in paragraphs (0022) to (0076) of Japanese Patent Application Publication 2005-1 48545.
- examples of the material forming the negative C plate include polyamide, polyimide, polyester, polyetherketone, polyamideimide, and polyesterimide.
- a so-called negative C plate having a relationship of nx ⁇ ny> nz is obtained by applying a coating liquid of the above material on a transparent substrate and curing it.
- the material that forms the negative C plate is not limited to these materials!
- the transparent substrate examples include polyolefin such as polyethylene and polypropylene, polyimide, polyamideimide, polyamide, polyetherimide, polyetheretherketone, polyetherketone, polyketonesulfide, polyethersulfone, polysulfone, and polyphenylenesulfide.
- Polyphenylene oxide Polyethylene terephthalate, Polybutylene terephthalate, Polyethylene naphthalate, Polyacetal, Polycarbonate, Polyacrylate, Acrylic resin, Polybulal alcohol, Polypropylene, Cellulose polymer, Epoxy resin, Phenolic resin, Norbornene Resin, isobutene ZN-methylmaleimide copolymer and styrene Z acrylic-tolyl copolymer mixture It can gel.
- the transparent substrate is made of polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, cenorelose polymer, norbornene resin, isobutene ZN-methylmaleimide copolymer and styrene Z acryl-tolyl copolymer mixture, etc.
- a polymer film comprising is particularly preferred.
- the transparent substrate is A film obtained by subjecting the surface of these polymer films to a treatment such as a hydrophilization treatment, a hydrophobization treatment, or a treatment for reducing the solubility of the substrate can also be used.
- examples of the solvent used for the coating liquid include chlorophenol, dichloromethane, carbon tetrachloride, dichloroethane, tetrachloroethane, trichloroethylene, tetrachloroethylene, black benzene, onole dichroic benzene.
- Non-hydrogenated hydrocarbons such as phenol, phenols such as phenol and parachlorophenol, aromatic hydrocarbons such as benzene, toluene, xylene, methoxybenzene, 1,2-dimethoxybenzene, acetone, ethyl acetate, t —Butyl alcohol, glycerin, ethylene glycol, triethylene glycol, ethylene glycol monomethyl ether, diethylene glycol glycol dimethylol ether, propylene glycol, dipropylene glycol, 2-methylolene 2, 4 pen Tandiol, Ethyl Cellosolve, Butyl Cellosolve, 2-Pyrrolidone, N-Methyl-2-Pyrrolidone, Pyridine, Triethylamine, Dimethylformamide, Dimethylacetamide, Acetonitrile, Buthiguchi-Tolyl, Methylisobutylketone, Methyletherketone, Cyclo
- the solution concentration of the coating solution can be determined as appropriate. However, in consideration of coating properties to the base material layer (prevention of foreign matter contamination, unevenness and streaks during coating), it is usually 0.5 mass. % To 50% by mass, preferably 1% to 40% by mass, and more preferably 2% to 30% by mass. If the solution concentration is 0.5% by mass or less, the solution viscosity is too low, so that it is difficult to apply up to a predetermined film thickness at a time. On the other hand, if the solution concentration is 30% by mass or more, the solution viscosity is too high, and problems such as rough coating may occur.
- the method for forming the optical compensation layer is a method in which a shrinkable film is bonded to one or both sides of a resin film to form a laminate, and the film is stretched while being heated.
- Examples of the resin film include films having positive or negative birefringence characteristics.
- Examples of the film exhibiting positive birefringence characteristics include polycarbonate, polyvinyl alcohol, cellulose acetate, polyester, polyarylate, polyimide, and polyolefin.
- Examples of such films include films containing
- Examples of the film having negative birefringence include a film containing polystyrene, a styrene copolymer, polymethyl methacrylate, a methyl methacrylate copolymer, or the like.
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Abstract
Description
Claims
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KR1020087015875A KR101047725B1 (ko) | 2006-02-08 | 2007-02-01 | 액정 표시 장치 |
US12/278,418 US7872714B2 (en) | 2006-02-08 | 2007-02-01 | Liquid crystal cell substrate with color filter, liquid crystal cell and liquid crystal display |
EP07707862A EP1983366A4 (en) | 2006-02-08 | 2007-02-01 | LIQUID CRYSTAL CELL SUBSTRATE WITH COLOR FILTER, LIQUID CRYSTAL CELL AND LIQUID CRYSTAL DISPLAY ARRANGEMENT |
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JP2006030561A JP4726130B2 (ja) | 2006-02-08 | 2006-02-08 | 液晶表示装置 |
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US7965353B2 (en) * | 2006-12-19 | 2011-06-21 | Toppan Printing Co., Ltd. | Color filter with perpendicular optical retardation and liquid crystal display device |
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JP4897341B2 (ja) * | 2006-04-28 | 2012-03-14 | 富士フイルム株式会社 | 液晶表示装置 |
JP5189899B2 (ja) * | 2007-09-27 | 2013-04-24 | 富士フイルム株式会社 | 光学補償フィルム、偏光板、及び液晶表示装置 |
JP5082761B2 (ja) * | 2007-10-24 | 2012-11-28 | 凸版印刷株式会社 | カラーフィルタおよび液晶表示装置 |
JP4930394B2 (ja) * | 2008-01-31 | 2012-05-16 | 凸版印刷株式会社 | 液晶表示装置 |
JP5428198B2 (ja) * | 2008-05-12 | 2014-02-26 | 凸版印刷株式会社 | カラーフィルタおよび液晶表示装置 |
CN102084274B (zh) * | 2008-07-04 | 2012-09-26 | 凸版印刷株式会社 | 滤色器及液晶显示装置 |
JP2010032870A (ja) * | 2008-07-30 | 2010-02-12 | Toppan Printing Co Ltd | カラーフィルタおよび液晶表示装置 |
JP2010085696A (ja) * | 2008-09-30 | 2010-04-15 | Fujifilm Corp | 液晶表示装置 |
CN101952750B (zh) | 2008-12-18 | 2012-05-30 | 凸版印刷株式会社 | 液晶显示装置用滤色器及液晶显示装置 |
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- 2007-02-01 CN CNA2007800049393A patent/CN101379427A/zh active Pending
- 2007-02-01 WO PCT/JP2007/051676 patent/WO2007091477A1/ja active Application Filing
- 2007-02-01 EP EP07707862A patent/EP1983366A4/en not_active Withdrawn
- 2007-02-01 KR KR1020087015875A patent/KR101047725B1/ko active IP Right Grant
- 2007-02-01 CN CN2010102236947A patent/CN101893781B/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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EP1983366A4 (en) | 2009-11-04 |
CN101893781B (zh) | 2013-07-17 |
CN101379427A (zh) | 2009-03-04 |
TW200736675A (en) | 2007-10-01 |
KR101047725B1 (ko) | 2011-07-08 |
CN101893781A (zh) | 2010-11-24 |
KR20080072958A (ko) | 2008-08-07 |
US7872714B2 (en) | 2011-01-18 |
JP4726130B2 (ja) | 2011-07-20 |
US20090096966A1 (en) | 2009-04-16 |
TWI358555B (ja) | 2012-02-21 |
JP2007212603A (ja) | 2007-08-23 |
EP1983366A1 (en) | 2008-10-22 |
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