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WO2012077644A1 - Dispositif d'affichage à cristaux liquides et procédé de fabrication d'un dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides et procédé de fabrication d'un dispositif d'affichage à cristaux liquides Download PDF

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WO2012077644A1
WO2012077644A1 PCT/JP2011/078092 JP2011078092W WO2012077644A1 WO 2012077644 A1 WO2012077644 A1 WO 2012077644A1 JP 2011078092 W JP2011078092 W JP 2011078092W WO 2012077644 A1 WO2012077644 A1 WO 2012077644A1
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Prior art keywords
liquid crystal
alignment
display device
crystal display
alignment region
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English (en)
Japanese (ja)
Inventor
健史 野間
真伸 水▲崎▼
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Sharp Corp
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Sharp Corp
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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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133742—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homeotropic alignment

Definitions

  • the present invention relates to a liquid crystal display device and a method for manufacturing the liquid crystal display device. More specifically, the present invention relates to a liquid crystal display device in which a polymer layer is formed on an alignment film in order to increase the alignment regulating force of liquid crystal, and a method for manufacturing a liquid crystal display device that can suitably form a polymer layer.
  • a liquid crystal display device is a display panel that controls light transmission / blocking (display on / off) by controlling the orientation of liquid crystal molecules having birefringence.
  • a technique for aligning liquid crystal molecules for example, a rubbing method is used in which after an alignment film material is applied, grooves are formed by a roller or the like to form an alignment film.
  • alignment control structures such as a bank-like protrusion formed of a dielectric provided on the electrode and a slit provided on the electrode
  • an alignment film material having a photo-alignment functional group instead of rubbing treatment, such as a method for controlling the alignment of liquid crystal molecules using UV and UV 2 A (Ultraviolet induced multi-domain Vertical Alignment) technology
  • UV and UV 2 A Ultraviolet induced multi-domain Vertical Alignment
  • liquid crystal molecules are aligned perpendicular to the substrate surface when no voltage is applied.
  • the liquid crystal molecules become a voltage. It is tilted and oriented at an appropriate angle.
  • a plurality of regions (domains) in which the directions in which the liquid crystal molecules fall are different from each other are formed in one pixel by slits or bank-like protrusions provided on the electrodes.
  • FIG. 6 is a diagram showing the relationship between relative luminance and gradation in a conventional liquid crystal display device.
  • FIG. 6 shows the relationship between relative luminance and gradation when the screen is viewed from the front (viewing angle 0 °) and obliquely (viewing angles 30 ° and 60 °).
  • viewing angle 0 ° viewing angle 0 °
  • viewing angles 30 ° and 60 ° viewing angles 30 ° and 60 °.
  • the relative luminance is higher when viewed from the oblique direction than when viewed from the front.
  • MPD Multi-Pixel-Drive
  • a liquid crystal material containing a monomer is injected between substrates, the monomer is polymerized in a state where a voltage is applied, and a polymer in which the direction in which the liquid crystal molecules fall is memorized is stored.
  • a technique (PSA technique) for forming a film on an alignment film is known (for example, see Patent Document 1).
  • FIG. 7 is a schematic cross-sectional view of the liquid crystal display device according to Patent Document 1 before the polymerization process
  • FIG. 8 is a schematic cross-sectional view of the liquid crystal display device according to Patent Document 1 after the polymerization process.
  • the liquid crystal display device includes an electrode 113 formed on a first transparent substrate (not shown), an array substrate 110 including an alignment film 112, and a second transparent substrate (not shown).
  • the liquid crystal layer 130 is sandwiched between the electrode 123 formed thereon and the color filter substrate including the alignment film 122.
  • the color filter substrate 120 further has a protrusion 115.
  • the liquid crystal molecules 104 and the monomer 105 are present in the liquid crystal layer 130.
  • the liquid crystal layer 130 is irradiated with ultraviolet light from the side of the array substrate 110 on which the light shielding mask 125 is formed while a predetermined voltage is applied to the liquid crystal layer 130 through the electrodes 113 and 123, and the polymerization of the monomer 105 is performed.
  • the light shielding mask 125 is formed on the array substrate 110 so as to cover approximately half of one pixel.
  • the monomer 105 present in the region not shielded by the light shielding mask 125 is polymerized. Thereafter, the light shielding mask 125 is removed, the entire surface of the liquid crystal panel is irradiated with ultraviolet light, and the monomer 105 remaining in the liquid crystal layer 130 is polymerized.
  • the first polymer layer 126 having a strong binding force on the liquid crystal molecules is formed in a region that is not shielded by the light shielding mask 125 (exposure region), while the region that is shielded by the light shielding mask 125 (light shielding region).
  • the second polymer layer 127 having a weak binding force on the liquid crystal molecules is formed.
  • a region having a strong binding force on the liquid crystal molecules that is, a region having a high threshold voltage
  • a region having a low binding force on the liquid crystal molecules that is, a region having a low threshold voltage
  • the above-described method for improving white spots may cause an increase in manufacturing cost and a decrease in display characteristics.
  • MPD technology requires a structure for changing the voltage applied in the dot. For this reason, there are disadvantages in that the manufacturing cost increases and the aperture ratio decreases due to an increase in wiring and the like.
  • the protrusion is used, but it is difficult to use the region where the protrusion is disposed for display. For this reason, there was room for improvement in terms of increasing the aperture ratio and improving the luminance.
  • the alignment of the liquid crystal molecules is affected by the protrusions not only in the region where the protrusions are disposed but also in the vicinity thereof, it is difficult to control the alignment to a desired orientation. For this reason, there was room for improvement in terms of improving contrast.
  • a voltage is applied when polymerization is performed, there is room for improvement in that the manufacturing cost is increased.
  • the present invention has been made in view of the above situation, and in the middle tone, while suppressing the deterioration of other display characteristics and the deterioration of reliability, such as a decrease in aperture ratio and a decrease in contrast ratio, which have been conventionally observed.
  • a liquid crystal display device capable of suppressing the occurrence of a so-called white spot phenomenon in which the luminance when the screen is viewed from above is higher than the luminance when the screen is viewed from the front, and a method for manufacturing the liquid crystal display It is for the purpose.
  • the present inventors paid attention to the PSA technology as a method for suppressing the white spot phenomenon, and conducted intensive studies on monomers used in the PSA technology.
  • specific bifunctional monomers on the vertical alignment film specifically, by forming a polymer layer using 1,6-dimethacryloxyphenanthrene represented by the following chemical formula (1) or 3,6-dimethacryloxyphenanthrene represented by the following chemical formula (2), the polymer layer It has been found that the threshold voltage of the region whose orientation is controlled can be adjusted.
  • the bifunctional monomer (1,6-dimethacryloxyphenanthrene or 3,6-dimethacryloxyphenanthrene) is a monomer that absorbs light having a long wavelength (wavelength longer than 330 nm) and causes a polymerization reaction. From this, it was found that the monomer can be polymerized without using short-wavelength light, so that damage to the liquid crystal and the alignment film can be suppressed. With the polymer layer, without deteriorating the liquid crystal or alignment film, the threshold voltage is different between the region where the alignment is controlled and the region where the alignment is not controlled by the polymer layer, and the above problem can be solved brilliantly. The present invention has been achieved.
  • one aspect of the present invention is a liquid crystal display device including a pair of substrates and a liquid crystal layer sandwiched between the pair of substrates, the liquid crystal layer having negative dielectric anisotropy. At least one of the pair of substrates is obtained by polymerization of an electrode, an alignment film for vertically aligning adjacent liquid crystal molecules, and 1,6-dimethacryloxyphenanthrene or 3,6-dimethacryloxyphenanthrene.
  • a first alignment region formed on a part of a main surface on the liquid crystal layer side of the alignment film and having a polymer layer for controlling alignment of adjacent liquid crystal molecules, and the alignment film and the liquid crystal molecules are in contact with each other;
  • a liquid crystal display device having a plurality of pixels provided with a second alignment region where a layer and a liquid crystal molecule are in contact with each other, wherein the first alignment region and the second alignment region have different threshold voltages; .
  • the upper limit of the wavelength length may be light having a wavelength at which 1,6-dimethacryloxyphenanthrene or 3,6-dimethacryloxyphenanthrene causes a polymerization reaction, and specifically, it is 380 nm or less. Further, the irradiated light is more preferably 340 nm to 380 nm.
  • the alignment film whose vertical alignment is controlled means an alignment film capable of realizing a liquid crystal display in a vertical alignment mode, and the liquid crystal molecules are completely perpendicular to the film surface, that is, only an alignment film whose alignment is controlled at 90 °. And an alignment film that controls the alignment of liquid crystal molecules substantially perpendicular to the film surface.
  • Substantially perpendicular means 80 ° or more, preferably 85 ° or more.
  • the pretilt angle of the liquid crystal molecules in each alignment region may be different.
  • the threshold voltage can be made different by changing the anchoring strength in each alignment region.
  • FIG. 3 is a diagram showing a change in a VT (voltage-transmittance) curve due to a difference in pretilt angle. As shown in FIG. 3, the threshold voltage increases as the pretilt angle increases.
  • the threshold voltage means a voltage value that generates an electric field that causes an optical change in the liquid crystal layer and changes a display state in the liquid crystal display device.
  • the difference between the threshold voltage of the first alignment region and the threshold voltage of the second alignment region is preferably 0.1 V or more, and more preferably 0.5 to 1.5 V.
  • the configuration of the liquid crystal display device of the present invention is not particularly limited by other components as long as such components are essential.
  • the alignment film is preferably formed by irradiating polarized ultraviolet light onto an alignment film material containing a photoreactive functional group. Since the pretilt angle can be adjusted accurately by using polarized ultraviolet light, the liquid crystal display device of the present invention can be suitably used for a photo-alignment type liquid crystal display device.
  • the photoreactive functional group is preferably at least one selected from the group consisting of a chalcone group, a coumarin group, a cinnamate group, an azobenzene group, and a tolan group.
  • a polymer having a photoreactive functional group is used, alignment control can be performed with high precision, and therefore, it can be particularly suitably used for an alignment control light alignment type liquid crystal display device.
  • a pretilt angle of liquid crystal molecules in the first alignment region and a pretilt angle of liquid crystal molecules in the second alignment region are different from each other.
  • the difference between the pretilt angle of the liquid crystal molecules in the first alignment region and the pretilt angle of the liquid crystal molecules in the second alignment region is preferably about 0.5 ° to 15 °.
  • the pretilt angle of the liquid crystal molecules in the first alignment region is preferably 88.0 ° to 88.5 °
  • the pretilt angle of the liquid crystal molecules in the second alignment region is 73.0 ° to 87. Preferably it is 5 °.
  • the pretilt angle of the liquid crystal molecules in the first alignment region is more preferably larger than the pretilt angle of the liquid crystal molecules in the second alignment region.
  • the area of the second alignment region is preferably larger than 30% and smaller than 70% compared to the sum of the area of the first alignment region and the area of the second alignment region. If the area of the second alignment region is 30% or less, the area of the first alignment region is too large compared to the area of the second alignment region, so that white spots can be sufficiently suppressed. There is a risk that it will not be possible. On the other hand, if the area of the second alignment region is 70% or more, the area of the first alignment region is too small compared to the area of the second alignment region. You may not be able to do it. More preferably, the area of the first alignment region and the area of the second alignment region are substantially equal. Specifically, the area of the second alignment region is equal to the first alignment region. More preferably, it is larger than 45% and smaller than 55% compared to the sum of the area of the second alignment region and the area of the second alignment region.
  • Another aspect of the present invention is a method for manufacturing a liquid crystal display device including a pair of substrates and a liquid crystal layer sandwiched between the pair of substrates, the manufacturing method including at least one of the pair of substrates.
  • a step of forming an electrode, a step of forming an alignment film for controlling the alignment of adjacent liquid crystal molecules vertically, and a polymer for controlling the alignment of liquid crystal molecules adjacent to a part of the liquid crystal side main surface of the alignment film Forming the polymer layer, and the step of forming the polymer layer includes a step of shielding a part of at least one of the pair of substrates by a light shielding member and not shielding the remaining part from 330 nm.
  • the 1,6-dimethacryloxyphenanthrene or 3,6-dimethacryloxyphenanthrene added to the liquid crystal layer is polymerized by irradiating light with a long wavelength, and the alignment film and the liquid crystal molecules are in contact with each other. And a second alignment region where the polymer layer and the liquid crystal molecules are in contact with each other, wherein the first alignment region and the second alignment region have a threshold voltage of each other. It is also a manufacturing method of a different liquid crystal display device.
  • the light shielding member is formed on one substrate so as to cover a part of one pixel region, for example.
  • a region that is not shielded by the light shielding member and a region that is shielded from light are generated in one pixel region.
  • a bifunctional monomer (1,6-dimethacryloxyphenanthrene or 3,6-dimethacryloxyphenanthrene) is polymerized by light irradiation, and the polymer layer is formed on the alignment film.
  • a second alignment region in which the alignment of liquid crystal molecules is controlled by the polymer layer is formed in the pixel.
  • the bifunctional monomer is not substantially polymerized in the light shielding region.
  • a first alignment region in which the alignment of liquid crystal molecules is controlled by the alignment film is formed. Since the alignment regulating forces of the polymer layer and the alignment film are different from each other, the first alignment region and the second alignment region have different threshold voltages.
  • the liquid crystal display device can be preferably manufactured. Further, since the irradiated light is light having a wavelength longer than 330 nm, damage to the liquid crystal and the alignment film can be suppressed as compared with irradiation with light having a short wavelength (330 nm or less).
  • the configuration of the manufacturing method of the liquid crystal display device of the present invention is not particularly limited by other components and processes as long as such components and processes are essential. A preferred embodiment in the method for producing a liquid crystal display device of the present invention will be described below.
  • a pretilt angle of liquid crystal molecules is controlled by the alignment film, and a part of the pixel is shielded from light by a light shielding member.
  • the liquid crystal layer is irradiated with light without applying voltage, and the 1,6-dimethacryloxyphenanthrene or the 3,6-dimethacryloxyphenanthrene is photopolymerized to form the polymer layer.
  • the pretilt angle of the liquid crystal molecules in the first alignment region is larger than the pretilt angle of the liquid crystal molecules in the second alignment region.
  • the threshold voltages of the respective alignment regions can be made different, and white spots can be suppressed.
  • the difference between the pretilt angle of the liquid crystal molecules in the first alignment region and the pretilt angle of the liquid crystal molecules in the second alignment region is preferably about 0.5 ° to 15 °.
  • the pretilt angle of the liquid crystal molecules in the first alignment region is preferably 88.0 ° to 88.5 °, and the pretilt angle of the liquid crystal molecules in the second alignment region is 73.0 ° to 87. Preferably it is 5 °.
  • the step of polymerizing 1,6-dimethacryloxyphenanthrene or 3,6-dimethacryloxyphenanthrene is preferably a step of irradiating non-polarized ultraviolet light.
  • the 1,6-dimethacryloxyphenanthrene or 3,6-dimethacryloxyphenanthrene can be efficiently polymerized.
  • the region that is not shielded by the light shielding member is preferably larger than 30% and smaller than 70% compared to all the regions where the liquid crystal is orientation controlled. If the area of the second alignment region is 30% or less, the area of the first alignment region is too large compared to the area of the second alignment region, so that white spots can be sufficiently suppressed. There is a risk that it will not be possible. On the other hand, if the area of the second alignment region is 70% or more, the area of the first alignment region is too small compared to the area of the second alignment region. You may not be able to do it. More preferably, the area of the first alignment region is substantially equal to the area of the second alignment region. Specifically, the area of the second alignment region is greater than 45% and less than 55% compared to the sum of the area of the first alignment region and the area of the second alignment region. More preferred.
  • the present invention it is not necessary to form protrusions on the substrate, and it is not necessary to provide MPD wiring or the like, and it is possible to form the first alignment region and the second alignment region having different threshold voltages. Therefore, it is possible to obtain a liquid crystal display device that is low in cost and has a high aperture ratio while suppressing white spots.
  • the second alignment region it is not necessary to irradiate light with a short wavelength, so that a highly reliable liquid crystal display device can be obtained.
  • FIG. 10 is a diagram showing measurement results of pretilt angles in Test Examples 3 and 4 and Comparative Example 3.
  • FIG. It is a figure which shows the relationship between the relative brightness
  • FIG. 1 It is a cross-sectional schematic diagram before the superposition
  • 4 is a schematic plan view showing a state where a light-shielding mask is provided in one pixel region of the array substrate of the liquid crystal display device according to Embodiment 1.
  • 1,6-dimethacryloxyphenanthrene or 3,6-dimethacryloxyphenanthrene is used to form the polymer layer.
  • the polymer layer is also referred to as a PSA (Polymer Sustained Alignment) film.
  • FIG. 1 is a schematic cross-sectional view of the liquid crystal display device according to the embodiment of the present invention before the polymerization step
  • FIG. 2 is a schematic cross-sectional view of the liquid crystal display device according to the embodiment of the present invention after the polymerization step.
  • 1 and 2 are also schematic cross-sectional views of one pixel region of the liquid crystal display device.
  • the liquid crystal display device according to the embodiment of the present invention is sandwiched between a pair of substrates each including an array substrate 10, a color filter substrate 20, and the array substrate 10 and the color filter substrate 20.
  • the array substrate 10 includes an insulating transparent substrate 11 made of glass or the like, a pixel electrode 13 formed on the transparent substrate 11, various wirings, TFTs, and the like.
  • the color filter substrate 20 includes an insulating transparent substrate 21 made of glass or the like, and a common electrode 23, a color filter, a black matrix, and the like formed on the transparent substrate 21.
  • Examples of the method for forming the pixel electrode 13 and the common electrode 23 include a sputtering method, a chemical vapor deposition (CVD) method, and a vapor deposition method.
  • the pixel electrode 13 can be patterned into a shape having a slit or a comb shape by using a photolithography method, but the pixel electrode 13 is not patterned into a shape having a slit or a comb shape, It may be a flat plate electrode formed in the pixel region.
  • a transparent metal oxide film such as indium tin oxide (ITO: Indium ⁇ ⁇ Tin Oxide) is preferably used.
  • the array substrate 10 includes an alignment film 12, and the color filter substrate 20 also includes an alignment film 22.
  • the alignment film material for forming the alignment films 12 and 22 is not particularly limited.
  • a material obtained by dissolving a polymer material in a solvent is used.
  • the polymer material include polyimide, polyamide, polyvinyl, polysiloxane, and the like.
  • the polymer material preferably contains a photoreactive functional group.
  • the photoreactive functional group include a chalcone group, a coumarin group, a cinnamate group, an azobenzene group, and a tolan group.
  • the alignment film is formed by irradiating polarized ultraviolet light. By forming the alignment film, the liquid crystal molecules can be pretilt aligned (initial tilt) in a substantially vertical direction.
  • Examples of a method for forming the alignment films 12 and 22 include a rubbing method in which grooves are formed by a roller or the like after applying an alignment film material to form an alignment film. Moreover, after apply
  • the bifunctional monomer 5 (1,6-dimethacryloxyphenanthrene or 3,6-dimethacryloxyphenanthrene) is present in the liquid crystal layer 30 before the bifunctional monomer polymerization step. Yes.
  • a light shielding mask 25 is provided on the outer side of the transparent substrate 21 (opposite the liquid crystal side), and shields about half of one pixel region.
  • non-polarized ultraviolet light having a wavelength of 330 nm or less cut by a wavelength cut filter is irradiated from the normal direction of the transparent substrate 21.
  • a voltage may be applied to the liquid crystal layer 30 via the pixel electrode 13 and the common electrode 23, but it is preferable that no voltage is applied from the viewpoint of reducing manufacturing costs.
  • the bifunctional monomer 5 starts to polymerize, and as shown in FIG. 2, a PSA layer 26 is formed in the unshielded region on the alignment films 12 and 22.
  • the PSA layer 26 changes the alignment regulating force of the alignment films 12 and 22.
  • the light shielding mask 25 shields the light, the PSA layer 26 is not formed, the region where the alignment films 12 and 22 and the liquid crystal layer 30 are in contact (the first alignment region 40), and the PSA layer 26 are formed.
  • a region where the liquid crystal layer 30 is in contact with the liquid crystal layer 30 (second alignment region 41) is formed. Since the first alignment region 40 and the second alignment region 41 have different alignment regulating forces, the threshold voltages are different from each other. In the liquid crystal display device shown in FIGS. 1 and 2, no voltage is applied, and the liquid crystal molecules are aligned substantially vertically.
  • the threshold voltage in the first alignment region is preferably larger than the threshold voltage in the second alignment region.
  • the pretilt angle of the liquid crystal molecules in the first alignment region is larger than the pretilt angle of the liquid crystal molecules in the second alignment region. It is preferable to do.
  • the threshold voltage in the first alignment region is made larger than the threshold voltage in the second alignment region. be able to.
  • a preferable range of the threshold voltage in the first alignment region is 2.0V to 2.5V.
  • a preferable range of the threshold voltage in the second alignment region is 0.5V to 2.0V.
  • the light shielding mask 25 may be formed in close contact with the transparent substrate 21 or may be formed apart from the transparent substrate 21.
  • the light shielding mask 25 is not particularly limited as long as it shields light.
  • the light shielding mask 25 may be formed of a metal such as Cr or Al, or may be formed of a resin.
  • FIG. 9 is a schematic plan view illustrating a state where a light-shielding mask is provided in one pixel region of the array substrate of the liquid crystal display device according to the first embodiment.
  • one pixel region has a substantially rectangular shape, and a plurality of pixels are arranged in a matrix or delta form to constitute one display surface.
  • the array substrate 10 intersects with a plurality of gate wirings 45 and auxiliary capacitance (Cs) wirings 43 extending in parallel with each other, and with the gate wiring 45 and auxiliary capacitance (Cs) wiring 43.
  • a plurality of source lines 42 extending in parallel to each other, and thin film transistors (TFTs) 44 provided in the vicinity of the intersections of the gate lines 45 and the source lines 42.
  • the light shielding mask 25 is formed so as to cover approximately half of one pixel region. At this time, if the direction in which the liquid crystal molecules are aligned is divided into two in the longitudinal direction of the pixels in one pixel region before the second alignment region is formed, the second alignment region is formed. Thus, the alignment direction of the liquid crystal molecules is divided into four within one pixel.
  • the shape of the light shielding mask 25 is not limited to the example of FIG. 9, and may be, for example, a shape that bisects the longitudinal direction of one pixel region, and is arranged in a checkered pattern in one pixel region. Such a shape may be used.
  • VHR was measured using a 6254 type liquid crystal property measuring system manufactured by Toyo Technica. More specifically, the liquid crystal cell is placed in an oven at 70 ° C., and charges are applied between the electrodes at an applied voltage of 1 V and 5 V for 60 ⁇ s, and then during an open period of 16.67 ms (a period in which no voltage is applied). The inter-electrode potential was measured, and the ratio of the retained charge was measured.
  • the liquid crystal cell was shaken, the retardation was measured by the Senarmont Method, and the pretilt angle was calculated by fitting using the crystal rotation method.
  • OMS-AF2 manufactured by Chuo Seiki Co., Ltd. was used.
  • a linearly polarized He—Ne laser (wavelength 632.8 nm, output 2 mW) was used as the light source, the measurement spot diameter was 1 mm, and the measurement temperature was 25 ° C.
  • Test example 1 An electrode was formed on the entire principal surface on one side of a pair of glass substrates, and an alignment film material containing polyimide having a cinnamate group that is a photoreactive functional group and an imidization ratio of 50% was applied by spin coating.
  • each glass substrate was irradiated with polarized ultraviolet light as an alignment treatment.
  • the irradiation angle and irradiation amount of polarized ultraviolet light were adjusted so that the pretilt angle was 88.1 to 88.5 °.
  • a seal is applied to one glass substrate, beads are dispersed on the other glass substrate, the two glass substrates are bonded together, and the bonded glass substrates are bonded at a pressure of 0.5 kgf / cm 2 . While applying pressure, the seal was cured by heating at 200 ° C. for 60 minutes in a nitrogen purged furnace.
  • a liquid crystal exhibiting negative dielectric anisotropy was injected into the cell produced by the above method.
  • 1,6-dimethacryloxyphenanthrene which is a bifunctional monomer, was added so as to be 0.6 wt% of the entire liquid crystal composition. After liquid crystal injection, heating and quenching were performed at 130 ° C. for 1 hour.
  • non-polarized UV (0.33 mW / cm 2 ) light having a wavelength of 330 nm or less cut by a wavelength cut filter is irradiated for 4 hours from the normal direction of the main surface of the glass substrate to polymerize the bifunctional monomer. It was.
  • Test example 2 Test Example, except that 1,6-dimethacryloxyphenanthrene was added to the liquid crystal instead of adding 6,6-dimethacryloxyphenanthrene to 0.6 wt% of the total liquid crystal composition In the same manner as in Example 1, a liquid crystal cell was produced.
  • Test example 3 A liquid crystal cell was produced in the same manner as in Test Example 1 except that the amount of 1,6-dimethacryloxyphenanthrene added to the liquid crystal was changed from 0.6 wt% to 0.3 wt% of the entire liquid crystal composition. .
  • Test example 4 A liquid crystal cell was produced in the same manner as in Test Example 2 except that the amount of 3,6-dimethacryloxyphenanthrene added to the liquid crystal was changed from 0.6 wt% to 0.3 wt% of the entire liquid crystal composition. .
  • Comparative Example 1 A liquid crystal cell was produced in the same manner as in Test Example 1 except that the bifunctional monomer was not added to the liquid crystal.
  • Comparative Example 3 The same liquid crystal cell as in Comparative Example 2 was produced except that the amount of 2,7-dimethacryloxyphenanthrene added in the liquid crystal was changed from 0.6 wt% to 0.3 wt% of the entire liquid crystal composition.
  • Table 1 shows monomer conditions and non-polarized ultraviolet light irradiation conditions in the liquid crystal display devices according to Test Examples 1 and 2 and Comparative Examples 1 and 2.
  • Table 2 shows monomer conditions and non-polarized ultraviolet light irradiation conditions in the liquid crystal display devices according to Test Examples 3 and 4 and Comparative Example 3.
  • the measurement results of the pretilt angle in the liquid crystal cells according to Test Examples 1 and 2 and Comparative Examples 1 and 2 are shown in FIG.
  • the measurement result of the pretilt angle in the liquid crystal cells according to Test Examples 3 and 4 and Comparative Example 3 is shown in FIG.
  • FIG. 4 is a diagram illustrating the measurement results of the pretilt angle in Test Examples 1 and 2 and Comparative Examples 1 and 2. As shown in FIG. 4, in Test Example 1 in which 0.6 wt% of 1,6-dimethacryloxyphenanthrene was added, the pretilt angle was 84.7 °, and 0.6 wt% of 3,6-dimethacryloxyphenanthrene was added. In Test Example 2 in which% was added, the pretilt angle was 61.4 °.
  • FIG. 5 is a diagram illustrating the measurement results of the pretilt angle in Test Examples 3 and 4 and Comparative Example 3.
  • Test Example 3 in which 0.3 wt% of 1,6-dimethacryloxyphenanthrene was added, the pretilt angle was 85.5 °, and 3,6-dimethacryloxyphenanthrene was 0.3 wt%.
  • Test Example 4 in which% was added, the pretilt angle was 70.6 °.
  • Comparative Example 2 in which 0.3 wt% of 2,7-dimethacryloxyphenanthrene was added, the pretilt angle was 88.1 °.
  • the initial VHR was 99% or more in any of Test Examples 3, 4 and Comparative Example 3.
  • the PSA layer formed by polymerizing 1,6-dimethacryloxyphenanthrene or 3,6-dimethacryloxyphenanthrene represented by the chemical formulas (1) to (2) has a pretilt angle of 88. It has been found that the pretilt angle can be reduced as compared with the alignment film having an angle of 0.1 to 88.5 °. It was also found that the pretilt angle can be reduced by increasing the monomer concentration of 1,6-dimethacryloxyphenanthrene and 3,6-dimethacryloxyphenanthrene. Furthermore, it has been found that 3,6-dimethacryloxyphenanthrene can have a smaller pretilt angle than 1,6-dimethacryloxyphenanthrene.
  • the pretilt angle in the second alignment region can be controlled and the threshold voltage of the second alignment region can be adjusted.
  • white spots can be suitably suppressed and contrast can be improved even if the voltage applied to all pixels is constant without changing the voltage applied to each pixel as in MPD.
  • the cost can be reduced and the aperture ratio can be increased.
  • the second alignment region can be formed without damaging the liquid crystal or the alignment film.
  • the PSA layer formed by polymerizing 2,7-dimethacryloxyphenanthrene represented by the above chemical formula (3) has a pretilt angle substantially equal to the pretilt angle of the alignment film, and 2,7-dimethacryloxy It has been found that a suitable PSA film cannot be obtained by using only phenanthrene.
  • the PSA film may or may not affect the pretilt angle. It was also found that when the pretilt angle is affected, the amount of change in the pretilt angle varies depending on the replacement position.
  • the liquid crystal display device according to the embodiment may be in the form of a color filter on array having a color filter on the array substrate 10.
  • the liquid crystal display device according to the embodiment may be a monochrome display. In that case, the color filter does not need to be arranged.
  • Liquid crystal molecules 5 Bifunctional monomer (1,6-dimethacryloxyphenanthrene or 3,6-dimethacryloxyphenanthrene) 10, 110: Array substrate 11, 21: Transparent substrate 12, 22, 112, 122: Alignment film 13: Pixel electrode 20, 120: Color filter substrate 23: Common electrode 25, 125: Shading mask 26: PSA layers 30, 130 : Liquid crystal layer 40: first alignment region 41: second alignment region 42: source wiring 43: auxiliary capacitance (Cs) wiring 44: TFT 45: Gate wiring 105: Monomer 113, 123: Electrode 115: Protrusion 126: First polymer layer 127: Second polymer layer

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Abstract

La présente invention concerne : un dispositif d'affichage à cristaux liquides capable de limiter l'apparition d'une tache blanche tout en limitant la détérioration de caractéristiques de l'affichage, notamment la diminution de l'ouverture relative et la diminution du rapport de contraste ; ainsi qu'un procédé de fabrication d'un dispositif d'affichage à cristaux liquides. Plus précisément, la présente invention concerne un dispositif d'affichage à cristaux liquides doté d'une paire de substrats et une couche de cristaux liquides maintenue entre la paire de substrats. Le dispositif d'affichage à cristaux liquides est caractérisé en ce que : la couche de cristaux liquides présente une anisotropie diélectrique négative ; au moins un des substrats de la paire de substrats est muni d'une électrode, d'un film d'alignement qui aligne verticalement des molécules adjacentes de cristaux liquides et d'une couche de polymère qui est formée sur une partie de la surface principale côté couche de cristaux liquides du film d'alignement en polymérisant du 1,6-diméthacryloxy phénanthrène ou du 3,6- diméthacryloxy phénanthrène et qui régule l'alignement de molécules adjacentes de cristaux liquides ; le dispositif d'affichage à cristaux liquides comprend une pluralité de pixels dont chacun est muni d'une première région d'alignement où le film d'alignement et les molécules de cristaux liquides sont en contact entre eux et d'une deuxième région d'alignement où la couche de polymère et les molécules de cristaux liquides sont en contact entre eux ; la première région d'alignement et la deuxième région d'alignement présentant des tensions seuils différentes l'une de l'autre.
PCT/JP2011/078092 2010-12-07 2011-12-05 Dispositif d'affichage à cristaux liquides et procédé de fabrication d'un dispositif d'affichage à cristaux liquides Ceased WO2012077644A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101008784A (zh) * 2007-02-06 2007-08-01 友达光电股份有限公司 感光性单体、液晶材料、液晶面板及其制作方法、光电装置及其制作方法
WO2009118086A1 (fr) * 2008-03-25 2009-10-01 Merck Patent Gmbh Afficheur à cristaux liquides
WO2010079703A1 (fr) * 2009-01-09 2010-07-15 シャープ株式会社 Dispositif d'affichage à cristaux liquides et composition pour former une couche de cristaux liquides

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101008784A (zh) * 2007-02-06 2007-08-01 友达光电股份有限公司 感光性单体、液晶材料、液晶面板及其制作方法、光电装置及其制作方法
WO2009118086A1 (fr) * 2008-03-25 2009-10-01 Merck Patent Gmbh Afficheur à cristaux liquides
WO2010079703A1 (fr) * 2009-01-09 2010-07-15 シャープ株式会社 Dispositif d'affichage à cristaux liquides et composition pour former une couche de cristaux liquides

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