WO2013047597A1 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2013047597A1
WO2013047597A1 PCT/JP2012/074735 JP2012074735W WO2013047597A1 WO 2013047597 A1 WO2013047597 A1 WO 2013047597A1 JP 2012074735 W JP2012074735 W JP 2012074735W WO 2013047597 A1 WO2013047597 A1 WO 2013047597A1
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Prior art keywords
liquid crystal
substrate
display device
electrode
crystal display
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PCT/JP2012/074735
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English (en)
Japanese (ja)
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村田　充弘
洋典 岩田
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シャープ株式会社
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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
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • 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
    • 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
    • G02F1/133738—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homogeneous alignment
    • 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
    • G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
    • G02F1/133757—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle with different alignment orientations
    • 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
    • G02F1/13787—Hybrid-alignment cells

Definitions

  • the present invention relates to a liquid crystal display device. More specifically, the present invention relates to a liquid crystal display device that can achieve both high transmittance and a wide viewing angle with a simple pixel structure.
  • a liquid crystal display device is configured by sandwiching a liquid crystal display element between a pair of glass substrates, etc., and is indispensable for daily life and business, such as mobile applications, various monitors, and televisions, taking advantage of its thin, lightweight, and low power consumption. It is impossible. In recent years, it has been widely used for electronic books, photo frames, IA (industrial equipment), PCs (personal computers), tablet PCs, smartphones, and the like. In these applications, liquid crystal display panels of various modes related to electrode arrangement and substrate design for changing the optical characteristics of the liquid crystal layer have been studied.
  • a liquid crystal display device in which a liquid crystal with positive dielectric anisotropy is sandwiched between a TFT substrate on which an electrode for driving liquid crystal is formed and a counter substrate on which a color filter is formed, and the TFT substrate includes: A pixel electrode and a common electrode are formed, one pixel is partitioned into a plurality of regions by the pixel electrode and the common electrode, and an initial alignment of the liquid crystal is perpendicular to the TFT substrate or the counter substrate, The direction of the liquid crystal molecules can be changed by applying a voltage between the pixel electrode and the common electrode, and the direction of the liquid crystal molecules when the voltage is applied is determined by the protrusions formed on the counter substrate.
  • a liquid crystal display device is disclosed in which the orientation of the liquid crystal molecules in the plurality of regions when the voltage is applied is controlled for each of the regions, and is different for each of the plurality of regions. (E.g., see Patent Document 1.).
  • a liquid crystal display device having a liquid crystal having a dielectric anisotropy singular point control is performed so that a singular point of an orientation vector field of the liquid crystal is formed at a predetermined position when a voltage is applied between the electrodes.
  • a liquid crystal display device having a portion and controlling the alignment of the liquid crystal using at least the formed singular point see, for example, Patent Document 2.
  • Patent Document 1 described above discloses widening of the viewing angle by four domains in a HAN (Hybrid Aligned Nematic) structure (a structure of a liquid crystal display device in which a liquid crystal is a hybrid alignment nematic liquid crystal). Further, Patent Document 2 described above discloses multi-domain formation in a radial alignment pattern by VA (vertical alignment; vertical alignment).
  • VA vertical alignment; vertical alignment
  • Patent Document 1 since the pixel electrode has a bowl shape, particularly in the design with a small pixel, the aperture ratio is lost due to the electrode portion, and there is room for improvement to improve the transmittance. There was also no disclosure of the type of polarizing plate. Patent Document 2 discloses a multi-domain technique in a pixel in VA. However, as in Patent Document 1, in particular, in a small pixel, the aperture ratio is reduced due to the arrangement of electrodes, and the transmittance is improved. There was room for ingenuity. In other words, as the display becomes more sophisticated, there is still a demand for a technology that maintains viewing angle performance and improves the transmittance, particularly with small pixels.
  • a liquid crystal display device having a particularly small pixel pitch e.g., 18 ⁇ m, equivalent to 470 ppi
  • the effective alignment region in the pixel is extremely lowered and the transmittance is drastically reduced.
  • two domains can be mentioned, but this deteriorates the viewing angle characteristics.
  • TBA Transverse Bend ⁇ ⁇ ⁇ Alignment
  • the present invention has been made in view of the above situation, and an object of the present invention is to provide a liquid crystal display device capable of achieving both high transmittance and a wide viewing angle.
  • the present inventors have made various studies on a liquid crystal panel capable of maintaining viewing angle performance and improving transmittance.
  • the conventional liquid crystal display device has been multi-domained by an electrode structure. I found that the rate was impaired. Then, paying attention to devising the orientation control layer, various methods for making the transmittance sufficient were examined. Then, the pixels when the main surface of the substrate is viewed in plan are divided vertically into the vertical direction, and the alignment control layer of the lower substrate (first substrate) when viewed in cross section is horizontal alignment (also referred to as parallel alignment). It was found that the orientation control layer of the upper substrate (second substrate) has a vertically oriented HAN structure.
  • the parallel alignment control region of the first substrate is set to at least two or more types, that is, the initial direction by optical alignment is 90 °, 270 ° (for example, FIG. 6), the domain is divided into two parts vertically, and the phase difference of the panel (also referred to as retardation or Re.
  • the unit is nm) and the phase difference of one wavelength in total in the same direction. It is possible to achieve both high transmittance and wide viewing angle by using a plate or a retardation plate having a retardation of the same size as the retardation of the panel in the orthogonal direction, in particular, by using a circularly polarizing plate.
  • the present inventors have found out what can be done and have conceived that the above-mentioned problems can be solved brilliantly, and have reached the present invention.
  • the present invention is a liquid crystal cell comprising a first substrate, a second substrate, and a liquid crystal layer sandwiched between both substrates, and a polarizing plate, wherein the liquid crystal layer comprises: Liquid crystal molecules having positive dielectric anisotropy, wherein the first substrate has an orientation control layer, a first electrode, and a second electrode, the second substrate has an orientation control layer, and The alignment control layer of the first substrate aligns liquid crystal molecules below the threshold voltage horizontally with respect to the substrate main surface. When the substrate main surface is viewed in plan, the liquid crystal molecules are unidirectionally arranged in the pixel.
  • An alignment control region for aligning liquid crystal molecules and an alignment control region for aligning liquid crystal molecules in a direction different from the direction, and the alignment control layer of the second substrate has liquid crystal molecules having a voltage lower than a threshold voltage on the main surface of the substrate.
  • the liquid crystal display device is oriented vertically.
  • the liquid crystal display device of the present invention is a high-definition pixel and can achieve a wide viewing angle and high transmittance by using photo-alignment (parallel).
  • L / S line / space
  • the aperture ratio is improved with a simple pixel structure.
  • the transmittance is remarkably high.
  • four domains can be formed and the viewing angle is good.
  • the first electrode and the second electrode usually include a plurality of linear portions.
  • the orientation of the liquid crystal is controlled by the electric field generated between the first electrode and the second electrode, and transmissive display is performed.
  • the first electrode and the second electrode are linear electrodes, and it is preferable that L / S (line / space) is substantially a pair between pixels.
  • the first electrode and the second electrode include a linear portion, and the linear portion of the first electrode and the linear portion of the second electrode are along each other.
  • the first electrode and the second electrode may constitute a pair of comb electrodes.
  • the linear portion of the first electrode and the linear portion of the second electrode are parallel to each other. The present invention can achieve a wide viewing angle with a simple pixel structure capable of improving the transmittance.
  • the first electrode and the second electrode can have different potentials at a threshold voltage or higher.
  • the threshold voltage means, for example, a voltage value that gives a transmittance of 5% when the transmittance in the bright state is set to 100%.
  • the potential different from the threshold voltage can be any voltage as long as it can realize a driving operation with a potential different from the threshold voltage. This makes it possible to suitably control the electric field applied to the liquid crystal layer. Become.
  • a preferable upper limit value of the different potential is, for example, 20V.
  • As a configuration that can be set to different potentials for example, one of the first electrode and the second electrode is driven by a certain TFT, and the other electrode is driven by another TFT.
  • the first electrode and the second electrode can be set to different potentials.
  • the width of the linear portion is preferably 2 ⁇ m or more, for example.
  • the width (also referred to as a space in this specification) between the linear portion of the first electrode and the linear portion of the second electrode is preferably 2 to 7 ⁇ m, for example.
  • the alignment control layer of the first substrate is preferably a photo-alignment film.
  • the alignment control layer of the second substrate is also preferably a photo-alignment film.
  • the liquid crystal display device includes a retardation plate on a side opposite to the liquid crystal layer of the first substrate and / or the second substrate, and the optical axis of the retardation plate is the first when the substrate main surface is viewed in plan view.
  • the orientation control layer of the substrate is along the direction in which the liquid crystal molecules are aligned at a value less than the threshold voltage, and the sum of the in-plane retardation of the retardation plate and the in-plane retardation at less than the threshold voltage of the liquid crystal cell is One wavelength, in other words, 530 to 570 nm is preferable. More preferably, the optical axis of the retardation plate is substantially parallel to the direction in which the alignment control layer of the first substrate aligns liquid crystal molecules below the threshold voltage when the substrate main surface is viewed in plan.
  • the crossed Nicol black changes to the maximum white state when the ⁇ / 2 plate is set to be shifted by 45 ° from the crossing angle.
  • Y value visible light
  • 275 nm corresponds to ⁇ / 2. That is, ⁇ is 550 nm. From this, the range of one wavelength is about 20 nm before and after that (530 to 570 nm), and if it is outside this range, it will not be black (contrast ratio [CR] is bad).
  • the liquid crystal display device includes a retardation plate on a side opposite to the liquid crystal layer of the first substrate and / or the second substrate, and the optical axis of the retardation plate is the first when the substrate main surface is viewed in plan view.
  • the alignment control layer of the substrate intersects the direction in which liquid crystal molecules are aligned below the threshold voltage, and the in-plane retardation of the retardation plate is substantially the same as the in-plane retardation of the liquid crystal cell below the threshold voltage. It is also preferred that it be.
  • the optical axis of the retardation plate is particularly preferably substantially perpendicular to the direction in which the alignment control layer of the first substrate aligns the liquid crystal molecules below the threshold voltage when the substrate main surface is viewed in plan.
  • a compensation retardation plate on the light incident side of the liquid crystal panel is preferable.
  • one retardation plate is disposed on the light incident side of the liquid crystal panel, a ⁇ / 4 plate is disposed so as to sandwich the liquid crystal panel and the retardation plate from above and below, and the ⁇ / 4 plate is sandwiched.
  • a polarizing plate is preferably disposed.
  • the distance between the first electrode and the second electrode increases as the distance from the boundary between the orientation control regions increases when the main surface of the substrate is viewed in plan. Thereby, viewing angle characteristics can be further improved.
  • the second substrate has a third electrode, and the third electrode is preferably planar and has a hole for orientation control. Thereby, viewing angle characteristics can be further improved.
  • the second substrate in the liquid crystal display device of the present invention may further include a third electrode. Thereby, an electric field can be effectively generated between the third electrode and the first electrode.
  • the second substrate may have an alignment regulation structure. Thereby, the stability of the alignment of the liquid crystal molecules can be improved.
  • the alignment regulating structure include an opening formed in the third electrode and a protrusion formed on the third electrode.
  • the second substrate has a third electrode, and it is particularly preferable that the third electrode is planar and has an alignment control hole.
  • the first electrode and the second electrode may be formed in different layers, but are preferably formed on the same insulating layer.
  • the first substrate preferably includes, for example, an alignment control layer from the liquid crystal layer side, first and second electrodes formed in the same layer, and an insulating layer.
  • the first electrode is a pixel electrode
  • the second electrode is a common electrode
  • the first substrate may further include a fourth electrode, and the liquid crystal layer is driven by an electric field generated by at least the first electrode, the second electrode, the third electrode, and the fourth electrode. May be.
  • the fourth electrode is preferably planar. Thereby, an electric field can be effectively generated between the fourth electrode and another electrode.
  • the liquid crystal panel of the present invention may be a horizontal alignment type liquid crystal panel, but is preferably a vertical alignment type liquid crystal panel from the viewpoint of improving contrast.
  • a general vertical alignment type liquid crystal panel has room for improvement in viewing angle characteristics.
  • the liquid crystal panel of the present invention is excellent in viewing angle characteristics. Therefore, when the liquid crystal panel of the present invention is a vertical alignment type liquid crystal panel, both a wide viewing angle and a high contrast can be achieved.
  • the liquid crystal layer includes liquid crystal molecules having positive dielectric anisotropy.
  • the liquid crystal layer is preferably composed of liquid crystal molecules having substantially positive dielectric anisotropy.
  • the polarizing plate in the present invention is preferably a circular polarizing plate. Moreover, it is also preferable that the polarizing plate in the present invention is a linear polarizing plate. According to the former, the transmittance can be improved. According to the latter, the viewing angle characteristics can be further improved. Note that a general liquid crystal panel including a circularly polarizing plate has room for improvement in viewing angle characteristics. On the other hand, the liquid crystal panel of the present invention is excellent in viewing angle characteristics. Therefore, when the liquid crystal panel of the present invention further comprises a circularly polarizing plate, high transmittance and a wide viewing angle can be made particularly excellent.
  • the kind and structure of the said circularly-polarizing plate are not specifically limited,
  • area can be used.
  • it is a laminate of a retardation plate and a linear polarizing plate (linear polarizer), but a structure (for example, cholesteric liquid crystal) having a helical structure at an optical pitch may be used.
  • the kind and structure of the said linear polarizing plate are not specifically limited,
  • area can be used.
  • the widths of the line and space of the first electrode and the second electrode, that is, the linear portion and the slit can be set as appropriate, but the width L of the linear portion is usually 1 to 8 ⁇ m (preferably 2 to 4 ⁇ m), and the slit width S is 1 to 8 ⁇ m (preferably 2 to 7 ⁇ m). It is preferable that the average value of L / S in one pixel is constant between pixels.
  • the cell gap d is about 2.8 to 4.5 ⁇ m (preferably 3.0 to 3.4 ⁇ m).
  • the pixel in the present invention is preferably a high-definition pixel, and for example, a pixel pitch of 10 to 150 ⁇ m in the vertical and horizontal directions is preferable. A more preferable upper limit value is 80 ⁇ m.
  • the liquid crystal display device of the present invention may be any of a transmissive type, a reflective type, and a transflective type.
  • the first substrate and the second substrate preferably includes a thin film transistor element, and the thin film transistor element preferably includes an oxide semiconductor.
  • the thin film transistor element included in the first substrate more preferably includes an oxide semiconductor.
  • the configuration of the liquid crystal display device of the present invention can be clarified by disassembling the liquid crystal display panel and analyzing the substrate opposite to the TFT array substrate.
  • the configuration of the liquid crystal drive device and the liquid crystal display device of the present invention is not particularly limited by other components as long as such components are formed as essential, and the liquid crystal drive device and the liquid crystal display are not limited.
  • Other configurations normally used in the apparatus can be applied as appropriate.
  • each form mentioned above may be combined suitably in the range which does not deviate from the summary of this invention.
  • liquid crystal display device that can achieve both high transmittance and a wide viewing angle.
  • FIG. 3 is a schematic cross-sectional view illustrating the liquid crystal display device with a voltage lower than the threshold voltage according to the first embodiment.
  • FIG. 5 is a schematic diagram showing tilt angle provision (alignment division) to liquid crystal molecules by photo-alignment in the vicinity of the first substrate at a voltage lower than the threshold voltage according to the first embodiment.
  • FIG. 3 is a schematic cross-sectional view showing the liquid crystal display device having a voltage equal to or higher than the threshold voltage according to the first embodiment.
  • FIG. 5 is a schematic diagram showing tilt angle provision (alignment division) to liquid crystal molecules by photo-alignment near the first substrate at a threshold voltage or higher according to Embodiment 1.
  • FIG. 6 is a simulation result showing a transmittance and a liquid crystal alignment state of a cross section of the liquid crystal display device at a threshold voltage or higher in the first embodiment.
  • 1 is a schematic plan view showing a liquid crystal display device according to Embodiment 1.
  • FIG. 3 is a schematic plan view illustrating a transmittance distribution and the like of the liquid crystal display device according to Embodiment 1.
  • FIG. 6 is a schematic plan view showing a liquid crystal display device according to Embodiment 2.
  • FIG. FIG. 6 is a schematic plan view showing a transmittance distribution and the like of a liquid crystal display device according to Embodiment 2.
  • 6 is a schematic plan view showing a liquid crystal display device according to Embodiment 3.
  • FIG. 6 is a schematic plan view showing a transmittance distribution and the like of a liquid crystal display device according to Embodiment 3.
  • 6 is a schematic plan view showing a liquid crystal display device according to Embodiment 4.
  • FIG. 6 is a schematic plan view illustrating a transmittance distribution and the like of a liquid crystal display device according to a fourth embodiment.
  • FIG. 10 is a schematic plan view showing a transmittance distribution and the like of a liquid crystal display device according to Embodiment 5.
  • FIG. 10 is a schematic plan view illustrating a transmittance distribution and the like of a liquid crystal display device according to Embodiment 6.
  • FIG. 10 is a schematic plan view showing a transmittance distribution and the like of a liquid crystal display device according to Embodiment 7.
  • FIG. 10 is a schematic plan view illustrating a transmittance distribution and the like of a liquid crystal display device according to Embodiment 8.
  • FIG. It is a figure which shows another example of arrangement
  • FIG. 6 is a schematic plan view showing a liquid crystal display device according to Comparative Example 1.
  • FIG. 6 is a schematic plan view showing a transmittance distribution and the like of a liquid crystal display device according to Comparative Example 1.
  • FIG. 10 is a schematic plan view showing a liquid crystal display device according to Comparative Example 2.
  • FIG. 6 is a schematic plan view showing a liquid crystal display device according to Reference Example 1.
  • FIG. It is a plane schematic diagram which shows the transmittance
  • FIG. 10 is a schematic plan view showing a liquid crystal display device according to Comparative Example 3.
  • FIG. It is a plane schematic diagram which shows the transmittance
  • 1 is a schematic plan view illustrating one embodiment of a thin film transistor.
  • 1 is a schematic plan view illustrating one embodiment of a thin film transistor.
  • each pixel is composed of a plurality of (usually three) picture elements.
  • the pixel may be a pixel (sub-pixel).
  • “orienting horizontally (parallel)” means aligning horizontally (parallel) to the main surface of the substrate.
  • the direction is represented by an angle (°) when the clock is rotated clockwise with the 3 o'clock direction of the clock set to 0 °.
  • members and portions that exhibit the same function are denoted by the same reference numerals except that the hundreds are changed.
  • the POL axis indicates a polarizer or analyzer of a linear polarizing plate.
  • the double-dotted arrow on the picture element region indicates the domain direction.
  • FIG. 1 is a schematic cross-sectional view illustrating a liquid crystal display device having a voltage lower than the threshold voltage according to the first embodiment.
  • FIG. 2 is a schematic diagram illustrating the provision of a tilt angle (alignment division) to liquid crystal molecules by photo-alignment in the vicinity of the first substrate at a voltage lower than the threshold voltage according to the first embodiment.
  • FIG. 3 is a schematic cross-sectional view showing the liquid crystal display device at a threshold voltage or higher according to the first embodiment.
  • FIG. 4 is a schematic diagram illustrating the provision of a tilt angle (alignment division) to liquid crystal molecules by photoalignment in the vicinity of the first substrate at a threshold voltage or higher according to the first embodiment.
  • the liquid crystal display device of Embodiment 1 includes an active matrix substrate (TFT array substrate) corresponding to a first substrate 10 having a drive electrode for a lateral electric field, a color filter on the glass substrate 21 facing the first substrate 10.
  • a second substrate 20 having a columnar spacer (not shown) disposed from the color filter layer in order to laminate a (CF) layer (not shown) and maintain a distance between the substrates;
  • the liquid crystal layer 30 is sandwiched between the second substrate 20 and the second substrate 20.
  • the first substrate 10 is provided on the back side of the liquid crystal display, and the second substrate 20 is provided on the viewer side.
  • the first substrate 10 and the second substrate 20 are bonded together by a sealing material provided so as to surround the display area.
  • the liquid crystal display device of Embodiment 1 has the following features (1) to (4).
  • the first substrate 10 having the drive electrodes according to the present embodiment has a structure that generates a parallel electric field.
  • a comb-like electrode (corresponding to the pixel electrode 13 corresponding to the first electrode and the second electrode) formed by photolithography or the like using IZO (or ITO) or the like.
  • Common electrode 15 is configured.
  • the second substrate 20 having a color filter facing the first substrate 10 is configured to planarize the color filter with an overcoat layer (OC), and the inside of the overcoat layer or the upper portion (over Columnar spacers are provided on the liquid crystal layer 30 side of the coating layer.
  • a photo-alignment film (parallel) is used for the first substrate 10, and a vertical alignment film is used for the second substrate 20.
  • the orientation is divided at the center of the electrode.
  • the first substrate 10 aligns neighboring liquid crystal molecules horizontally (parallel)
  • the second substrate 20 uses neighboring liquid crystal molecules.
  • a HAN structure in which is vertically oriented.
  • the liquid crystal layer uses liquid crystal molecules having positive dielectric anisotropy and is driven by a lateral electric field.
  • the driving electrodes are formed by sputtering indium tin oxide (ITO) on the glass substrate 11 on one side to a thickness of 1400 mm.
  • ITO indium tin oxide
  • IZO indium zinc oxide
  • a positive type liquid crystal material ( ⁇ 23) manufactured by Merck Co., Ltd. was sealed by a vacuum injection method, and a circularly polarizing plate was bonded thereto to produce a liquid crystal display element.
  • the alignment state at the time of voltage application is substantially divided into four domains by obtaining complementary alignment compensation symmetrically at the center of the electrode interval and at the same time performing complementary alignment compensation at the parallel alignment division at the center of the pixel.
  • the name of this mode is also called 4D-HBA (4 domain, hybrid bend alignment).
  • the circularly polarizing plate is an optical element that transmits one of right circularly polarized light and left circularly polarized light and absorbs or reflects the other.
  • FIG. 5 is a simulation result showing the transmittance and the liquid crystal alignment state of the cross section of the liquid crystal display device above the threshold voltage of the first embodiment. The simulation was performed using LCD-Master 3D manufactured by Shintech. D represents a director.
  • the liquid crystal display device of the present embodiment includes a liquid crystal panel, a backlight unit (not shown) provided behind the liquid crystal panel, and a control unit (see FIG. 5) for driving and controlling the liquid crystal panel and the backlight unit. (Not shown).
  • a thin film transistor TFT
  • a pixel electrode corresponding to the first electrode 13 and provided in each pixel
  • a common electrode corresponding to the second electrode 15 and provided in each pixel
  • An alignment film is formed.
  • a region divided by the gate bus line and the source bus line is approximately one picture element region.
  • a color filter layer (not shown) and a vertical alignment film are laminated in this order.
  • a counter electrode corresponding to the third electrode may be provided between the color filter layer and the vertical alignment film.
  • the counter electrode has a planar shape and is formed without a cut so as to cover at least the entire display area.
  • the vertical alignment film is formed without a break so as to cover at least the entire display region.
  • the vertical alignment film can align liquid crystal molecules in the vicinity in a direction substantially perpendicular to the film surface.
  • the material of the vertical alignment film may be an organic alignment film formed using an organic material including polyimide or the like, or an inorganic alignment film formed using an inorganic material including silicon oxide. Also good.
  • the vertical alignment film of the second substrate using the photo-alignment film material for example, a method of irradiating the photo-alignment film with ultraviolet rays from the vertical direction to develop a pretilt angle of approximately 90 °, etc. It is done.
  • the vertical alignment film may be subjected to an alignment treatment such as rubbing treatment or ultraviolet irradiation, but it is preferable that the alignment treatment is not performed, and the vertical alignment property is merely formed. It is more preferable to express Thereby, an orientation process process can be abbreviate
  • Each picture element has two horizontal orientation control areas that divide the picture element area into approximately two equal parts.
  • the pixel electrode 13 and the common electrode 15 are provided so as to overlap each other along the arrangement direction of both horizontal alignment control regions.
  • a planar lower electrode may be provided below the first electrode 13 and the second electrode 15.
  • the first electrode 13 and the second electrode 15 include a plurality of linear portions arranged in parallel with each other with a gap therebetween.
  • the slit and the linear portion extend substantially parallel to the source bus line.
  • the width of the linear portion means the length of the linear portion in the direction orthogonal to the longitudinal direction
  • the width of the slit means the slit in the direction orthogonal to the longitudinal direction.
  • the color filter layer includes a plurality of color layers (color filters) provided corresponding to each picture element.
  • the color layer is used for color display and is formed of a transparent organic insulating film such as an acrylic resin containing a pigment.
  • Each pixel is composed of, for example, three picture elements that output light of each color of R (red), G (green), and B (blue).
  • the kind and number of the color of the picture element which comprises each pixel are not specifically limited, It can set suitably.
  • FIG. 6 is a schematic plan view illustrating the liquid crystal display device according to the first embodiment.
  • FIG. 7 is a schematic plan view illustrating the transmittance distribution and the like of the liquid crystal display device according to the first embodiment.
  • the ⁇ / 4 plate is disposed with its retardation plate axis shifted by 45 ° from the compensation retardation plate axis so as to sandwich the liquid crystal panel and the compensation retardation plate from above and below.
  • the phase difference plate axis of the ⁇ / 4 plate is shown.
  • the polarizing plate is arranged in such a manner as to sandwich the ⁇ / 4 plate, and the orientation of the polarizer or the analyzer of the polarizing plate is indicated as “POL axis”.
  • POL axis Such a positional relationship among the compensation retardation plate, the ⁇ / 4 plate, and the polarizing plate is the same in the later-described embodiments (FIGS. 9, 11, 13, and 18).
  • the pixel layout using the TBA type 18 ⁇ m pitch comb-teeth electrodes is used to positively form four domains, so that the center portion of the pixel electrode 13 (the vertical division portion of the photo-alignment) is applied to the pixel shown in FIG.
  • the orientation was controlled in the direction of the arrow. That is, as shown in FIG. 6, the liquid crystal molecules in the display region surrounded by the one-dot chain line are aligned in the direction indicated by the one-dot chain line by the photo-alignment film, and the liquid crystal molecules in the display region surrounded by the broken line are aligned. Orientation is in the direction indicated by the dashed arrow.
  • the compensation retardation plate axis is substantially parallel to the direction in which the photo-alignment film of the first substrate aligns the liquid crystal molecules below the threshold voltage when the substrate main surface is viewed in plan.
  • the orientation direction shown in FIG. 6 is also referred to as a domain axis in this specification.
  • the space between the pair of comb electrodes at this time changes from 4.5 ⁇ m to 6 ⁇ m at the center toward the pixel end.
  • L / S is 3 ⁇ m / 5.5 ⁇ m on average in one pixel, and this is constant between pixels.
  • the tilt angle for controlling the parallel orientation was set at 3 °. Since the retardation of the panel is parallel on one side, the retardation at the off time is 206 nm.
  • the additional retardation plate may be placed either above or below the liquid crystal panel, and a 360 nm retardation plate is arranged so that the total wavelength is 1 (560 nm). Under these conditions, the transmittance of circularly polarized light and linearly polarized light was simulated. The transmittance in the first embodiment was 22.5%.
  • FIG. 8 is a schematic plan view showing the liquid crystal display device according to the second embodiment.
  • FIG. 9 is a schematic plan view illustrating the transmittance distribution and the like of the liquid crystal display device according to the second embodiment.
  • L / S 3 ⁇ m / 5.5 ⁇ m.
  • it concerns a circularly polarized light system, and the transmittance T (%) was as high as 20.0%.
  • the wavelength of transmitted light in the simulation is 550.0 nm.
  • the counter substrate has a counter electrode.
  • a hole (indicated by a white dotted line in FIG. 8) in the counter electrode, an oblique electric field is generated from the pixel electrode of the lower substrate to the upper portion, and four domains can be more actively formed.
  • the alignment control hole may be a pinhole-shaped hole used for controlling the liquid crystal in the radial alignment mode.
  • Other configurations in the second embodiment are the same as those in the first embodiment.
  • the cell thickness is 3.2 ⁇ m
  • the cell thickness and the liquid crystal used are the same in all embodiments, reference examples, and comparative examples described later.
  • FIG. 10 is a schematic plan view illustrating the liquid crystal display device according to the third embodiment.
  • FIG. 11 is a schematic plan view illustrating the transmittance distribution and the like of the liquid crystal display device according to the third embodiment.
  • L / S 3 ⁇ m / 5.5 ⁇ m.
  • the transmittance T (%) was as high as 21.8%.
  • the wavelength of transmitted light in the simulation is 550.0 nm.
  • comb-teeth electrodes with a pitch of 18 ⁇ m are used, but the pixel electrodes are laid out so as to be symmetrical above and below the pixels. For this reason, the balance of four domains is good.
  • Other configurations in the third embodiment are the same as those in the first embodiment.
  • FIG. 12 is a schematic plan view showing the liquid crystal display device according to the fourth embodiment.
  • FIG. 13 is a schematic plan view illustrating the transmittance distribution and the like of the liquid crystal display device according to the fourth embodiment.
  • the transmittance T (%) was as high as 22.4%.
  • the wavelength of transmitted light in the simulation is 550.0 nm.
  • the fourth embodiment comb-shaped electrodes with a pitch of 18 ⁇ m are used, and the pixel electrodes are laid out so that the pixel electrodes are symmetrical above and below the pixels.
  • the configuration of the fourth embodiment is the same as that of the second embodiment except that there is no electrode on the counter substrate side of the second embodiment in which four domains are balanced. Other configurations in the fourth embodiment are the same as those in the first embodiment. In both Embodiments 3 and 4, multi-domaining in four directions is achieved for improved transmittance and viewing angle.
  • the optical film configuration of the circularly polarizing plate is as described above.
  • one retardation plate is disposed on the light incident side of the liquid crystal for liquid crystal compensation cancellation, and the liquid crystal and the retardation plate are arranged.
  • ⁇ / 4 plates (45 ° shifted from the compensation retardation plate axis and intersecting at right angles) are arranged above and below, respectively, and a linear polarizing plate is arranged so as to sandwich the ⁇ / 4 plate.
  • FIG. 14 is a schematic plan view illustrating the transmittance distribution and the like of the liquid crystal display device according to the fifth embodiment.
  • Embodiment 5 is the same as the configuration of Embodiment 1 except that the orientation of the POL axis is changed and the circular polarization system is changed to a linear polarization system.
  • FIG. 6 a schematic plan view showing the liquid crystal display device of Embodiment 5 is shown in FIG. This is the same as in the first embodiment (FIG. 6).
  • the transmittance T (%) was as high as 20.7%.
  • the wavelength of transmitted light in the simulation is 550.0 nm.
  • the orientation of the polarizer in the linearly polarizing plate is 135.0 °
  • the orientation of the analyzer is 45.0 °.
  • FIG. 15 is a schematic plan view illustrating the transmittance distribution and the like of the liquid crystal display device according to the sixth embodiment.
  • the sixth embodiment is the same as the configuration of the second embodiment except that the orientation of the POL axis is changed and the circularly polarized light system is changed to a linearly polarized light system.
  • a schematic plan view showing the liquid crystal display device of the sixth embodiment is shown in FIG. This is the same as in the second embodiment (FIG. 8).
  • the transmittance T (%) was as high as 20.2%.
  • the wavelength of transmitted light in the simulation is 550.0 nm.
  • the orientation of the polarizer in the linearly polarizing plate is 135.0 °
  • the orientation of the analyzer is 45.0 °.
  • FIG. 16 is a schematic plan view illustrating the transmittance distribution and the like of the liquid crystal display device according to the seventh embodiment.
  • Embodiment 7 is the same as the configuration of Embodiment 3 except that the direction of the POL axis is changed and the circular polarization system is changed to a linear polarization system.
  • the schematic plan view showing the liquid crystal display device of Embodiment 7 is shown in FIG. This is the same as in Embodiment 3 (FIG. 10).
  • the transmittance T (%) was as high as 21.4%.
  • the wavelength of transmitted light in the simulation is 550.0 nm.
  • the orientation of the polarizer in the linearly polarizing plate is 135.0 °
  • the orientation of the analyzer is 45.0 °.
  • FIG. 17 is a schematic plan view illustrating the transmittance distribution and the like of the liquid crystal display device according to the eighth embodiment.
  • Embodiment 8 is the same as the configuration of Embodiment 4 except that the orientation of the POL axis is changed and the circular polarization system is changed to a linear polarization system.
  • FIG. 12 a schematic plan view showing a liquid crystal display device of Embodiment 8 is shown in FIG. This is the same as in the fourth embodiment (FIG. 12).
  • the transmittance T (%) was as high as 19.4%.
  • the wavelength of transmitted light in the simulation is 550.0 nm. As shown in FIG.
  • the orientation of the polarizer in the linearly polarizing plate is 135.0 °, and the orientation of the analyzer is 45.0 °.
  • the transmittance of circularly polarized light and linearly polarized light is almost the same, but this is achieved more effectively in the 4-domain configuration, and the liquid crystal molecules have a linearly polarized light extraction efficiency. The reason is that many are aligned in the good 45 ° direction.
  • FIG. 18 and 19 are diagrams showing another arrangement example of the retardation plates.
  • FIG. 18 shows another arrangement example of the retardation plates in the circular polarization system
  • FIG. 19 shows another arrangement example of the retardation plates in the linear polarization system.
  • the retardation plates may be arranged such that the retardation plate axis is in the 0-180 ° azimuth perpendicular to the domain axis.
  • the compensation retardation plate axis is substantially perpendicular to the direction in which the photo-alignment film of the first substrate aligns the liquid crystal molecules below the threshold voltage when the main surface of the substrate is viewed in plan.
  • a 206 nm retardation plate can be used so as to eliminate the retardation of the panel. Even if the retardation plate shaft is arranged in this manner, the effects of the present invention can be exhibited.
  • the optical film configuration itself of the circularly polarizing plate shown in FIG. 18 is the same as the optical film configuration of the circularly polarizing plate described above, and the circularly polarizing plate system has one retardation plate for liquid crystal compensation cancellation. Placed on the light incident side of the liquid crystal, ⁇ / 4 plates (45 ° shifted from the compensation retardation plate axis and intersected at right angles) above and below the liquid crystal and the retardation plate, respectively, In this structure, the ⁇ / 4 plates are sandwiched.
  • FIG. 20 is a schematic plan view showing a liquid crystal display device according to Comparative Example 1.
  • FIG. 21 is a schematic plan view showing the transmittance distribution and the like of the liquid crystal display device according to Comparative Example 1.
  • the transmittance T (%) was 19.3%.
  • Reference numeral 41 represents a glass substrate
  • reference numeral 43 represents a first electrode
  • reference numeral 45 represents a second electrode. The following also represents the same members except that the hundreds are changed.
  • FIG. 41 represents a glass substrate
  • reference numeral 43 represents a first electrode
  • reference numeral 45 represents a second electrode. The following also represents the same members except that the hundreds are changed.
  • FIG. 1 represents a glass substrate
  • reference numeral 43 represents a first electrode
  • reference numeral 45 represents a second electrode. The following also represents the same members except that the hundreds are changed
  • FIG. 22 is a schematic plan view showing a liquid crystal display device according to Comparative Example 2.
  • FIG. 23 is a schematic plan view showing the transmittance distribution and the like of the liquid crystal display device according to Comparative Example 2.
  • 24 is a schematic plan view showing a liquid crystal display device according to Reference Example 1.
  • FIG. FIG. 25 is a schematic plan view illustrating the transmittance distribution and the like of the liquid crystal display device according to Reference Example 1.
  • the transmittance when the pixel layout using the TBA-type comb-teeth electrode is reduced to a high-definition pixel (from 146 ppi to 470 ppi) was calculated with LCD-Master3D manufactured by Shintec.
  • the arrangement area of the comb electrodes is reduced, and the transmittance (linearly polarized light) is drastically reduced.
  • the transmittance is greatly improved by using two domains, the viewing angle becomes poor because of almost two domains as shown in the figure below.
  • FIG. 26 is a schematic plan view showing a liquid crystal display device according to Comparative Example 3.
  • FIG. 27 is a schematic plan view showing the transmittance distribution and the like of the liquid crystal display device according to Comparative Example 3.
  • the pixel pitch is 18 ⁇ m ⁇ 54 ⁇ m
  • TBA is divided into two domains
  • L / S 3 ⁇ m / 5.5 ⁇ m.
  • it concerns a linearly polarized light system, and the transmittance T (%) was 24.0%.
  • FIG. 28 is a schematic plan view showing the transmittance distribution and the like of the liquid crystal display device according to Comparative Example 4.
  • the pixel pitch is 18 ⁇ m ⁇ 54 ⁇ m
  • TBA is made into two domains
  • L / S 3 ⁇ m / 5.5 ⁇ m.
  • it concerns a circularly polarized light system, and the transmittance T (%) was 25.2%.
  • the transmittance was simulated by circularly polarized light in a pixel having a two-domain structure in a pixel layout using a TBA type 18 ⁇ m pitch comb electrode.
  • the molecular axis at an angle of 45 ° from the absorption axis determines the transmitted light intensity
  • molecules in an orientation state deviating from the orientation are also converted into transmitted light. Because it is.
  • the transmittance is improved, the viewing angle is not improved due to the originally two domains.
  • a liquid crystal display device in MB As seen in a tablet or the like, pixels have been increased in definition and the pixel size has been reduced.
  • the transmittance can also be achieved in 4 domains, but in the 4-domain TBA of the comparative example 2 in which the pixel pitch is small, the gap is increased due to the arrangement of the comb teeth (increase in the transmission loss portion). As a result, the transmittance decreases.
  • To satisfy the transmittance with a pixel size of 18 ⁇ m pitch there are a method of forming two domains as in Comparative Example 3 and eliminating the loss part, and a method of improving the transmittance by using circularly polarized light. The viewing angle is poor because there are no four directions.
  • a horizontal (parallel) photo-alignment film is disposed on the lower substrate, and the initial alignment is divided in the vertical direction (90/270 ° azimuth). Therefore, in addition to the complementary compensation between the comb electrodes in the transverse electric field of TBA, complementary compensation is realized also in the upper and lower electrodes, so that four domains can be realized, and the transmittance is improved by circular polarization (linear polarization). However, there is an effect, but circularly polarized light is even more effective).
  • a lateral electric field is generated between the pixel electrode and the common electrode of the lower layer substrate, and in the second embodiment, the four-domain is more actively formed by the oblique electric field generated by the slit electrode of the counter substrate.
  • each embodiment of the present invention is preferably combined with an oxide semiconductor TFT.
  • the semiconductor in the thin film transistor used for the pixel electrode of the present invention is preferably an oxide semiconductor (such as indium gallium zinc composite oxide [IGZO]).
  • IGZO indium gallium zinc composite oxide
  • 29 and 30 are schematic plan views illustrating one embodiment of a thin film transistor. s represents a source, d represents a drain, and g represents a gate.
  • FIG. 29 shows the case where an amorphous silicon semiconductor layer (Si) is used, but as shown in FIG. 30, an oxide semiconductor layer OS (IGZO or the like) is used as the semiconductor layer instead of the Si semiconductor layer. It can be used suitably.
  • An oxide semiconductor shows higher carrier mobility than amorphous silicon. For this reason, the area of the transistor using the oxide semiconductor layer OS can be smaller than that of amorphous silicon in one pixel. Specifically, the size can be reduced by about 40 to 50%.
  • This miniaturization contributes as it is as an aperture ratio, so that the light transmittance per pixel can be increased. Therefore, by using the oxide semiconductor TFT, the transmittance improving effect which is the effect of the present invention can be obtained more remarkably.
  • the mainstream is about 300 ppi (pixel per inch).
  • the pixel pitch is about 30 ⁇ m.
  • IGZO As a result of the improvement of the aperture ratio by the TFT using the above, a synergistic effect is obtained with respect to the improvement of the transmittance.
  • the aperture ratio (transmittance) of 5% can be increased by reducing the area of the TFT by adopting IGZO, as shown in Table 4 below.
  • Table 4 below l ( ⁇ m) is an example of the distance (channel length) between the source s and the drain d shown in FIGS. 29 and 30, respectively, and w1 ( ⁇ m) is shown in FIG. It is an example of the length (channel width) of one side of the illustrated amorphous silicon semiconductor layer Si, and w2 ( ⁇ m) is an example of the length (channel width) of one side of the oxide semiconductor layer OS illustrated in FIG. .
  • the area ( ⁇ m 2 ) refers to the area of the TFT when the width of the source s and drain d is calculated to be 5 ⁇ m.
  • the aperture ratio refers to the ratio of the area of the opening to the pixel area in one pixel.
  • the liquid crystal display device has a certain function and effect in combination with the above-described oxide semiconductor TFT, but is driven using a known TFT element such as an amorphous silicon TFT or a polycrystalline silicon TFT. Is also possible.

Abstract

La présente invention se rapporte à un dispositif d'affichage à cristaux liquides qui permet à la fois une vitesse de transmission élevée et un large angle de visualisation. Ce dispositif d'affichage à cristaux liquides est un dispositif d'affichage à cristaux liquides qui comprend : une couche de cristaux liquides qui comprend des molécules de cristaux liquides qui présentent une anisotropie diélectrique positive ; un premier substrat qui comprend une couche de commande d'orientation, une première électrode et une seconde électrode ; un second substrat qui comprend une couche de commande d'orientation, la couche de commande d'orientation du premier substrat orientant horizontalement, par rapport à la surface principale du substrat, des molécules de cristaux liquides à une tension inférieure à une tension de seuil et présentant, dans un pixel, une zone de commande d'orientation qui oriente les molécules de cristaux liquides dans une direction qui est différente de ladite direction ; et la couche de commande d'orientation du second substrat orientant verticalement, par rapport à la surface principale du substrat, des molécules de cristaux liquides à une tension inférieure à une tension de seuil.
PCT/JP2012/074735 2011-09-29 2012-09-26 Dispositif d'affichage à cristaux liquides WO2013047597A1 (fr)

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Citations (7)

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Publication number Priority date Publication date Assignee Title
JPH09105941A (ja) * 1995-10-13 1997-04-22 Stanley Electric Co Ltd 液晶表示装置
JPH11295740A (ja) * 1998-04-16 1999-10-29 Nec Corp 液晶表示装置、その製造方法およびその駆動方法
JP2000267104A (ja) * 1999-03-19 2000-09-29 Fujitsu Ltd 液晶表示装置
JP2002229032A (ja) * 2000-12-05 2002-08-14 Hyundai Display Technology Inc 反射型フリンジフィールド駆動モード液晶表示装置
JP2009237554A (ja) * 2008-03-03 2009-10-15 Hitachi Displays Ltd 電気光学素子および表示装置
JP2010054835A (ja) * 2008-08-28 2010-03-11 Toshiba Mobile Display Co Ltd 液晶表示装置
JP2011029373A (ja) * 2009-07-24 2011-02-10 Sharp Corp 薄膜トランジスタ基板及びその製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09105941A (ja) * 1995-10-13 1997-04-22 Stanley Electric Co Ltd 液晶表示装置
JPH11295740A (ja) * 1998-04-16 1999-10-29 Nec Corp 液晶表示装置、その製造方法およびその駆動方法
JP2000267104A (ja) * 1999-03-19 2000-09-29 Fujitsu Ltd 液晶表示装置
JP2002229032A (ja) * 2000-12-05 2002-08-14 Hyundai Display Technology Inc 反射型フリンジフィールド駆動モード液晶表示装置
JP2009237554A (ja) * 2008-03-03 2009-10-15 Hitachi Displays Ltd 電気光学素子および表示装置
JP2010054835A (ja) * 2008-08-28 2010-03-11 Toshiba Mobile Display Co Ltd 液晶表示装置
JP2011029373A (ja) * 2009-07-24 2011-02-10 Sharp Corp 薄膜トランジスタ基板及びその製造方法

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