WO2016206130A1 - 蓝相液晶显示装置及其驱动方法 - Google Patents

蓝相液晶显示装置及其驱动方法 Download PDF

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Publication number
WO2016206130A1
WO2016206130A1 PCT/CN2015/083078 CN2015083078W WO2016206130A1 WO 2016206130 A1 WO2016206130 A1 WO 2016206130A1 CN 2015083078 W CN2015083078 W CN 2015083078W WO 2016206130 A1 WO2016206130 A1 WO 2016206130A1
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Prior art keywords
electrode
viewing angle
liquid crystal
pixel
phase liquid
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English (en)
French (fr)
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谢畅
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Wuhan China Star Optoelectronics Technology Co Ltd
TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to US14/786,051 priority Critical patent/US9963635B2/en
Publication of WO2016206130A1 publication Critical patent/WO2016206130A1/zh
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/02—Liquid crystal materials characterised by optical, electrical or physical properties of the components, in general
    • C09K19/0275—Blue phase
    • 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
    • G02F1/1323—Arrangements for providing a switchable viewing angle
    • 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
    • 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
    • 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
    • G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • 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
    • G02F1/13793—Blue phases
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a blue phase liquid crystal display device, and to a driving method of the blue phase liquid crystal display device.
  • Fig. 1 is a view showing a state in which a liquid crystal display device having a wide and narrow viewing angle conversion function in the prior art is not biased to an upper substrate electrode.
  • a liquid crystal display device of the prior art includes an upper substrate 10, a blue phase liquid crystal layer 30, and a lower substrate 20.
  • the upper substrate 10 and the lower substrate 20 are disposed in parallel with each other and each pixel structure is divided into a main pixel for display and a sub-pixel for switching a viewing angle.
  • the upper substrate 10 includes an upper substrate glass layer 11, an upper substrate quarter wave plate 12, an upper substrate half wave plate 13 and an upper substrate polarizing plate 14.
  • the lower substrate 20 includes a lower substrate glass layer 21, a lower substrate quarter wave plate 22, a lower substrate half wave plate 23, and a lower substrate polarizing plate 24.
  • the pixel electrode 25 and the common electrode 26 are arranged on the lower substrate glass layer 21 in the arrangement range of the main pixel and the sub-pixel.
  • the upper substrate electrode 15 is provided on the lower surface of the upper substrate glass layer 11 only in the layout range of the sub-pixel.
  • the bias voltage when the bias voltage is not applied to the upper substrate electrode 15, the upper substrate electrode 15, the pixel electrode 25, and the common electrode 26 are both at zero potential. At this time, the blue phase liquid crystal molecules in the main pixel region and the blue phase liquid crystal molecules in the sub-pixel region are optically isotropic.
  • the backlight incident from the lower substrate 20 cannot pass through the upper substrate polarizing plate 14 and the lower substrate polarizing plate 24. Therefore, when the bias voltage is not applied, the liquid crystal display device does not leak light in the dark state, and has a good dark state, thereby realizing a wide viewing angle.
  • the pixel electrode 25 and the common electrode 26 remain at zero potential. At this time, the blue phase liquid crystal molecules in the main pixel region are still optically isotropic. However, the upper substrate electrode 15 generates a vertical electric field between the pixel electrode 25 and the common electrode 26, respectively. The blue phase liquid crystal molecules in the vertical electric field are deflected and arranged vertically.
  • the backlight that is normally incident from the lower substrate 20 passes through the blue phase liquid crystal layer 30, the polarization state of the blue phase liquid crystal molecules does not change, and the backlight cannot pass through the liquid crystal cell.
  • the liquid crystal display device When the backlight obliquely incident from the lower substrate passes through the blue phase liquid crystal layer 30, the polarization state of the blue phase liquid crystal molecules changes, so that a part of the backlight passes through the liquid crystal cell. Therefore, when a bias voltage is applied, the liquid crystal display device leaks light in a dark state, thereby achieving a narrow viewing angle.
  • a drawback of the liquid crystal display device described above is that the display device has a viewing angle switching dead zone.
  • the view switching dead zone is the non-switchable area shown in FIG. Referring to FIG. 3, when a bias voltage is applied to the upper substrate electrode 15, the oblique light in the non-switchable region passes through the optically isotropic blue phase liquid crystal molecules in the main pixel region without passing through the sub-pixel region. Vertically aligned blue phase liquid crystal molecules. Since only the oblique light passing through the blue phase liquid crystal molecules arranged vertically in the sub-pixel region can realize the function of switching the viewing angle, the non-switchable region is the above-described viewing angle switching dead region. The existence of the viewing angle switching dead zone makes the viewing angle control effect of the above liquid crystal display device poor.
  • the present invention provides a blue phase liquid crystal display device and a driving method thereof.
  • a blue phase liquid crystal display device comprising:
  • a pixel electrode and a common electrode formed on the array substrate, wherein the pixel electrode and the common electrode are arranged in phase;
  • a plurality of viewing angle switching electrodes formed on the blue phase liquid crystal layer, and a viewing angle switching electrode is disposed directly above each of the pixel electrodes and directly above each of the common electrodes;
  • a color filter substrate polarizing plate formed on the color filter substrate is formed on the color filter substrate.
  • the viewing angle switching electrode is disposed in parallel with the pixel electrode or the common electrode corresponding thereto.
  • the width of the viewing angle switching electrode is equal to the width of the pixel electrode or the common electrode corresponding thereto.
  • the width of the pixel electrode and the width of the common electrode are equal, and the pixels adjacent to each other are electrically The spacing between the pole and the common electrode is equal.
  • the ratio of the width of the pixel electrode to the pitch is 1/3 - 3/4.
  • the viewing angle switching electrode, the pixel electrode, and the common electrode are all transparent electrodes.
  • the transparent electrode is one of or a combination of an indium tin oxide transparent electrode, an indium zinc oxide transparent electrode, and an indium gallium oxide transparent electrode.
  • the blue phase liquid crystal display device further includes a driving circuit
  • the driving circuit is configured to provide a first bias voltage greater than or smaller than a pixel voltage to a viewing angle switching electrode corresponding to the pixel electrode in a narrow viewing angle mode, and to provide a viewing angle switching electrode corresponding to the common electrode a second bias voltage that is greater than or less than a common voltage to form a vertical electric field between the viewing angle switching electrode and the pixel electrode or the common electrode corresponding thereto.
  • the first bias voltage and the second bias voltage are both equal to an average of the pixel voltage and the common voltage.
  • a method for driving the above-described blue phase liquid crystal display device comprising:
  • a first bias voltage greater than or less than a pixel voltage is supplied to a viewing angle switching electrode corresponding to the pixel electrode, and a viewing voltage is supplied to a viewing angle corresponding to the common electrode to be greater than or less than a common voltage a second bias voltage to form a vertical electric field between the viewing angle switching electrode and the pixel electrode or the common electrode corresponding thereto.
  • the first bias voltage and the second bias voltage are both equal to an average of the pixel voltage and the common voltage.
  • the blue phase liquid crystal display device described in this embodiment can greatly reduce the probability of occurrence of the viewing angle switching dead zone and improve the blue color.
  • the display effect of the liquid crystal display device in the narrow viewing angle mode can greatly reduce the probability of occurrence of the viewing angle switching dead zone and improve the blue color.
  • FIG. 1 shows a prior art liquid crystal display device having a wide and narrow viewing angle conversion function without applying an upper substrate electrode State diagram in the case of applying a bias voltage
  • FIG. 2 is a view showing a state in which a liquid crystal display device shown in FIG. 1 is applied with a bias voltage to an upper substrate electrode;
  • FIG. 3 is a schematic view showing a non-switchable area and a switchable area of the liquid crystal display device shown in FIG. 2;
  • FIG. 4 is a schematic view showing a state in which a bias voltage is not applied to a viewing angle switching electrode when a blue phase liquid crystal display device of the embodiment of the present invention is displayed in a dark state;
  • FIG. 5 is a schematic view showing a state in which a bias voltage is applied to a viewing angle switching electrode when a blue phase liquid crystal display device of the embodiment of the present invention is displayed in a dark state;
  • Figure 6 is a view showing a switchable area of the blue phase liquid crystal display device shown in Figure 5;
  • FIG. 7 is a flow chart showing a driving method of a blue phase liquid crystal display device according to an embodiment of the present invention.
  • the embodiment of the present invention provides a blue phase liquid crystal display device.
  • the blue phase liquid crystal display device of the present embodiment mainly includes an array substrate polarizing plate 8, an array substrate 7, a pixel electrode 5, a common electrode 6, a blue phase liquid crystal layer 4, a viewing angle switching electrode 3, a color filter substrate 2, and color Film substrate polarizing plate 1.
  • the array substrate 7 is formed on the array substrate polarizing plate 8.
  • the pixel electrode 5 and the common electrode 6 are disposed in the same layer.
  • a pattern having the pixel electrode 5 and the common electrode 6 is formed on the array substrate 7, and the pixel electrode 5 and the common electrode 6 are arranged alternately.
  • the blue phase liquid crystal layer 4 is formed on the above-described pattern having the pixel electrode 5 and the common electrode 6.
  • a pattern having a plurality of viewing angle switching electrodes 3 is formed on the blue phase liquid crystal layer 4.
  • the color filter substrate 2 is formed on the above-described pattern having a plurality of viewing angle switching electrodes 3.
  • the color filter substrate polarizing plate 1 is formed on the color filter substrate 2.
  • the setting positions of the respective viewing angle switching electrodes 3 are required to satisfy the following conditions: one viewing angle switching electrode 3 is disposed directly above each of the pixel electrodes 5 and directly above each of the common electrodes 6. In other words, there is one pixel electrode 5 or the common electrode 6 disposed directly below each of the viewing angle switching electrodes 3.
  • the viewing angle switching electrode 3 When the bias voltage is not applied to the viewing angle switching electrode 3 (ie, the viewing angle switching electrode 3 is suspended), the viewing angle is switched.
  • the pole 3 does not have any influence on the display effect of the blue phase liquid crystal display device.
  • the liquid crystal display device is displayed in a dark state, all of the blue phase liquid crystal molecules of the blue phase liquid crystal layer 4 remain optically isotropic. At this time, the blue phase liquid crystal display device operates in the wide viewing angle mode.
  • a vertical electric field can be formed between each of the viewing angle switching electrodes 3 and the pixel electrode 5 or the common electrode 6 corresponding to the viewing angle switching electrode 3.
  • Fig. 5 is a view showing a state in which a bias voltage is applied to the viewing angle switching electrode 3 when the blue phase liquid crystal display device of the embodiment of the present invention is displayed in a dark state. As shown in FIG. 5, when the pixel voltage applied to the pixel electrode 5 is equal to the common voltage applied to the common electrode 6, the blue phase liquid crystal display device is in a dark state display state.
  • a first bias voltage that is not equal to the pixel voltage is applied to the viewing angle switching electrode 3 corresponding to the pixel electrode 5 at this time, and a second bias that is not equal to the common voltage is applied to the viewing angle switching electrode 3 corresponding to the common electrode 6
  • the voltage generates a vertical electric field between each of the viewing angle switching electrodes 3 and the pixel electrode 5 or the common electrode 6 corresponding to the viewing angle switching electrode 3.
  • the blue phase liquid crystal molecules located in the vertical electric field generate a vertical phase retardation under the action of a vertical electric field, thereby causing these blue phase liquid crystal molecules to be vertically oriented in the direction of the vertical electric field.
  • the blue phase liquid crystal molecules outside the vertical electric field still remain optically isotropic.
  • an array of vertically aligned blue phase liquid crystal molecules is arranged with an array of blue phase liquid crystal molecules which maintain optical isotropy.
  • Fig. 6 is a view showing a switchable area of the blue phase liquid crystal display device shown in Fig. 4. Referring to Figure 6, almost all of the oblique light passes through the vertically aligned blue phase liquid crystal molecules. Therefore, the blue phase liquid crystal display device of the present embodiment can greatly reduce the probability of occurrence of a viewing angle switching dead zone, and improve the display effect of the blue phase liquid crystal display device in a narrow viewing angle mode.
  • the first bias voltage and the second bias voltage are both made on the basis that the first bias voltage is not equal to the pixel voltage and the second bias voltage is not equal to the common voltage. Equal to the average of the pixel voltage and the common voltage. In the present embodiment, since the same bias voltage is applied to all of the viewing angle switching electrodes 3, the driving circuit is simplified.
  • the properties and setting positions of the electrodes can be further defined.
  • the viewing angle switching electrode 3 is arranged in parallel with the pixel electrode 5 or the common electrode 6 corresponding thereto.
  • the width of the viewing angle switching electrode 3 is equal to the width of the pixel electrode 5 or the common electrode 6 corresponding thereto.
  • the viewing angle switching electrode 3 is disposed in alignment with the corresponding pixel electrode 5 or the common electrode 6 in the vertical direction. That is, the left edge of the viewing angle switching electrode 3 and the corresponding pixel electrode 5 or the common electrode The left edge of 6 is in the same vertical plane, and the right edge of the view switching electrode 3 is in the same vertical plane as the corresponding pixel electrode 5 or the right edge of the common electrode 6.
  • the width of the pixel electrode 5 and the width of the common electrode 6 are equal, and the pitch between the pixel electrode 5 and the common electrode 6 adjacent to each other is equal.
  • the ratio of the width of the pixel electrode 5 to the above pitch is 1/3 - 3/4. It has been proved by a large number of experiments that when the ratio of the width of the pixel electrode 5 to the above-mentioned pitch satisfies 1/3 to 3/4, the viewing angle switching dead zone can be completely eliminated.
  • the width of the pixel electrode 5 may be 2-3 ⁇ m, and the spacing between the pixel electrode 5 and the common electrode 6 may be 4-6 ⁇ m.
  • the width of the pixel electrode 5 is 2 ⁇ m
  • the above pitch is 4 ⁇ m.
  • the pitch is 6 ⁇ m.
  • the viewing angle switching electrode 3, the pixel electrode 5, and the common electrode 6 are all transparent electrodes.
  • the transparent electrode is preferably one of an Indium Tin Oxide (ITO) transparent electrode, an Indium Zinc Oxide (IZO) transparent electrode, and an Indium Gallium Oxide (IGO) transparent electrode. combination.
  • the blue phase liquid crystal display device further includes a driving circuit.
  • the driving circuit is for controlling the power-on state of the pixel electrode 5, the common electrode 6, and the viewing angle switching electrode 3.
  • the driving circuit controls the viewing angle switching electrode 3 to be suspended, that is, the power supply to the viewing angle switching electrode 3 is prohibited.
  • the driving circuit is disposed to supply a first bias voltage greater than or smaller than the pixel voltage to the viewing angle switching electrode 3 corresponding to the pixel electrode 5, and to switch the electrode 3 to the viewing angle corresponding to the common electrode 6.
  • a second bias voltage greater than or less than a common voltage is provided such that a vertical electric field is formed between the viewing angle switching electrode 3 and the pixel electrode 5 or the common electrode 6 corresponding to the viewing angle switching electrode 3.
  • both the first bias voltage and the second bias voltage are equal to an average of the pixel voltage and the common voltage.
  • the blue phase liquid crystal display device of the present embodiment has the following three revolutionary features.
  • the blue phase liquid crystal molecules are always optically isotropic without applying a bias voltage, so that the blue phase liquid crystal display device has a large viewing angle and a good dark state.
  • the theoretical response time of the blue phase liquid crystal display device can reach below milliseconds, which greatly improves the response speed.
  • the blue phase liquid crystal display device does not need to be provided with the alignment layer, thereby reducing the manufacturing cost while reducing the manufacturing cost. Simplifies the manufacturing process.
  • an embodiment of the present invention also provides a method for driving the above-described blue phase liquid crystal display device.
  • FIG. 7 is a schematic flow chart of a driving method of a blue phase liquid crystal display device according to an embodiment of the present invention.
  • the method for driving the liquid crystal display device of the embodiment mainly includes step 101, step 102 and step 103.
  • step 101 it is determined whether the blue phase liquid crystal display device is in the wide viewing angle mode.
  • step 102 when it is determined that the blue phase liquid crystal display device is in the wide viewing angle mode, the viewing angle switching electrode 3 is controlled. Hanging. Then quit.
  • the blue phase liquid crystal display device operates in the wide viewing angle mode, and since the viewing angle switching electrode 3 is in a floating state, the viewing angle switching electrode 3 does not have any influence on the display effect of the blue phase liquid crystal display device.
  • step 103 when it is determined that the blue phase liquid crystal display device is not in the wide viewing angle mode, it is determined that the blue phase liquid crystal display device is in the narrow viewing angle mode.
  • the first bias voltage that is greater than or less than the pixel voltage is supplied to the viewing angle switching electrode 3 corresponding to the pixel electrode 5, and is supplied to the viewing angle switching electrode 3 corresponding to the common electrode 6 to be larger or smaller.
  • the second bias voltage of the common voltage is such that a vertical electric field is formed between the viewing angle switching electrode 3 and the pixel electrode 5 or the common electrode 6 corresponding to the viewing angle switching electrode 3.
  • both the first bias voltage and the second bias voltage are equal to an average of the pixel voltage and the common voltage.
  • a first bias voltage that is greater than or less than a pixel voltage is supplied to the viewing angle switching electrode 3 corresponding to the pixel electrode 5, and a viewing voltage that is greater than or less than a common voltage is supplied to the viewing angle switching electrode 3 corresponding to the common electrode 6.
  • the second bias voltage causes a vertical electric field to be generated between each of the viewing angle switching electrodes 3 and the pixel electrode 5 or the common electrode 6 corresponding to the viewing angle switching electrode 3.
  • the blue phase liquid crystal molecules located in the vertical electric field generate a vertical phase retardation under the action of a vertical electric field, thereby causing these blue phase liquid crystal molecules to be vertically oriented in the direction of the vertical electric field.
  • the blue phase liquid crystal molecules outside the vertical electric field still remain optically isotropic.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
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  • Liquid Crystal Display Device Control (AREA)

Abstract

一种蓝相液晶显示装置及其驱动方法。在显示装置中，每个视角切换电极（3）均有一像素电极（5）或公共电极（6）与之正对设置。在窄视角模式下，正对设置的电极间产生的竖直电场使电场内的液晶分子竖直排列。由于几乎所有的斜射光线都会穿过竖直排列的液晶分子，因此能大幅减少出现视角切换死区的机率。

Description

蓝相液晶显示装置及其驱动方法
本申请要求享有2015年6月25日提交的名称为“蓝相液晶显示装置及其驱动方法”的中国专利申请CN201510359121.X的优先权，其全部内容通过引用并入本文中。
技术领域
本发明涉及显示技术领域，尤其涉及一种蓝相液晶显示装置，还涉及一种该蓝相液晶显示装置的驱动方法。
背景技术
目前，手机、掌上电脑、笔记本电脑等采用液晶显示器的便携式电子设备越来越多地被人们使用。有时用户需要与他人分享便携式电子设备显示的图像，而有时用户出于保护个人隐私而不希望他人看到显示的图像。由此，就需要一种能实现宽、窄视角转换的显示装置来同时满足这两种需求。
图1示出了现有技术中具有宽、窄视角转换功能的液晶显示装置在未对上基板电极施加偏置电压的情况下的状态示意图。参照图1，现有技术中的液晶显示装置包括上基板10、蓝相液晶层30和下基板20。上基板10和下基板20彼此平行设置且每个像素结构都被分成用于显示的主像素和用于切换视角的次像素。上基板10包括上基板玻璃层11、上基板四分之一波片12、上基板二分之一波片13和上基板偏振片14。类似地，下基板20包括下基板玻璃层21、下基板四分之一波片22、下基板二分之一波片23和下基板偏振片24。在主像素和次像素的布设范围内，像素电极25和公共电极26相间排列在下基板玻璃层21上。仅在次像素的布设范围内，在上基板玻璃层11的下表面设置有上基板电极15。使用上述液晶显示装置时，通过控制是否向上基板电极15施加偏置电压，来实现液晶显示装置的宽、窄视角的切换。
具体地，仍参照图1，当未向上基板电极15施加偏置电压时，上基板电极15、像素电极25和公共电极26均为零电势。此时主像素区域内的蓝相液晶分子和次像素区域内的蓝相液晶分子均呈光学各向同性。从下基板20入射的背光无法穿过上基板偏振片14和下基板偏振片24。因此，在未施加偏置电压时，液晶显示装置在暗态时没有漏光，具有很好的暗态，从而实现了宽视角。
参照图2，当向上基板电极15施加偏置电压时，像素电极25与公共电极26仍保持零电势。此时主像素区域内的蓝相液晶分子仍呈光学各向同性。然而，上基板电极15分别与像素电极25和公共电极26之间产生竖直电场。竖直电场内的蓝相液晶分子均发生偏转，呈竖直排列状态。从下基板20正入射的背光经过蓝相液晶层30时，蓝相液晶分子的偏振状态不发生变化，背光无法穿过液晶盒。而从下基板斜入射的背光经过蓝相液晶层30时，蓝相液晶分子的偏振状态将发生变化，从而将有部分背光穿过液晶盒。因此，在施加偏置电压时，液晶显示装置在暗态时有漏光，从而实现了窄视角。
上述液晶显示装置的缺陷在于：该显示装置存在视角切换死区。视角切换死区即为图3中所示的不可切换区域。参照图3，当向上基板电极15施加偏置电压时，不可切换区域内的斜射光线只穿过主像素区域内呈光学各向同性的蓝相液晶分子，而不会穿过次像素区域内呈竖直排列的蓝相液晶分子。由于只有穿过次像素区域内呈竖直排列的蓝相液晶分子的斜射光线才能实现视角切换的功能，因此不可切换区即为上述视角切换死区。视角切换死区的存在使得上述液晶显示装置的视角控制效果差。
发明内容
为了克服现有技术中的具有宽、窄视角转换功能的液晶显示装置存在视角切换死区的缺陷，本发明提供了一种蓝相液晶显示装置及其驱动方法。
根据本发明的一个方面，提供了一种蓝相液晶显示装置，其包括：
阵列基板偏振片；
形成在所述阵列基板偏振片上的阵列基板；
形成在所述阵列基板上的像素电极和公共电极，所述像素电极和公共电极相间排列；
形成在所述像素电极和公共电极上的蓝相液晶层；
形成在所述蓝相液晶层上的多个视角切换电极，每个所述像素电极的正上方和每个所述公共电极的正上方均对应设置有一所述视角切换电极；
形成在所述视角切换电极上的彩膜基板；以及
形成在所述彩膜基板上的彩膜基板偏振片。
优选的是，所述视角切换电极和与其相对应的所述像素电极或者所述公共电极平行设置。
优选的是，所述视角切换电极的宽度和与其相对应的所述像素电极或者所述公共电极的宽度相等。
优选的是，所述像素电极的宽度和所述公共电极的宽度相等，彼此相邻的所述像素电 极和所述公共电极之间的间距相等。
优选的是，所述像素电极的宽度与所述间距的比值为1/3-3/4。
优选的是，所述视角切换电极、所述像素电极和所述公共电极均为透明电极。
优选的是，所述透明电极为氧化铟锡透明电极、氧化铟锌透明电极和氧化铟镓透明电极中的一种或其组合。
优选的是，上述蓝相液晶显示装置还包括驱动电路；
所述驱动电路设置为在窄视角模式下向与所述像素电极相对应的视角切换电极提供大于或者小于像素电压的第一偏置电压，并向与所述公共电极相对应的视角切换电极提供大于或者小于公共电压的第二偏置电压，以使所述视角切换电极和与其相对应的所述像素电极或者所述公共电极之间形成竖直电场。
优选的是，所述第一偏置电压和所述第二偏置电压均等于所述像素电压和所述公共电压的平均值。
根据本发明的另一个方面，提供了用于驱动上述蓝相液晶显示装置的方法，其包括：
在窄视角模式下，向与所述像素电极相对应的视角切换电极提供大于或者小于像素电压的第一偏置电压，并向与所述公共电极相对应的视角切换电极提供大于或者小于公共电压的第二偏置电压，以使所述视角切换电极和与其相对应的所述像素电极或者所述公共电极之间形成竖直电场。
优选的是，所述第一偏置电压和所述第二偏置电压均等于所述像素电压和所述公共电压的平均值。
与现有技术相比，上述方案中的一个或多个实施例可以具有如下优点或有益效果：
由于在窄视角模式下几乎所有的斜射光线都会穿过竖直排列的蓝相液晶分子，因此，本实施例所述的蓝相液晶显示装置能够大幅减少出现视角切换死区的机率，提高了蓝相液晶显示装置在窄视角模式下的显示效果。
本发明的其它特征和优点将在随后的说明书中阐述，并且部分地从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
附图用来提供对本发明的进一步理解，并且构成说明书的一部分，与本发明的实施例共同用于解释本发明，并不构成对本发明的限制。在附图中：
图1示出了现有技术中具有宽、窄视角转换功能的液晶显示装置在未对上基板电极施 加偏置电压的情况下的状态示意图；
图2示出了图1中所示的液晶显示装置在对上基板电极施加偏置电压的情况下的状态示意图；
图3示出了图2中所示的液晶显示装置的不可切换区域和可切换区域的示意图；
图4示出了本发明实施例蓝相液晶显示装置在暗态显示时，在未对视角切换电极施加偏置电压的情况下的状态示意图；
图5示出了本发明实施例蓝相液晶显示装置在暗态显示时，在对视角切换电极施加偏置电压的情况下的状态示意图；
图6示出了图5中所示的蓝相液晶显示装置的可切换区域的示意图；以及
图7示出了本发明实施例蓝相液晶显示装置的驱动方法的流程示意图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。需要说明的是，只要不构成冲突，本发明中的各个实施例以及各实施例中的各个特征可以相互结合，所形成的技术方案均在本发明的保护范围之内。
为了克服现有技术中的具有宽、窄视角转换功能的液晶显示装置存在视角切换死区的缺陷，本发明实施例提供了一种蓝相液晶显示装置。
如图4所示，是本发明实施例蓝相液晶显示装置在未对视角切换电极施加偏置电压的情况下的状态示意图。参照图4，本实施例的蓝相液晶显示装置主要包括阵列基板偏振片8、阵列基板7、像素电极5、公共电极6、蓝相液晶层4、视角切换电极3、彩膜基板2和彩膜基板偏振片1。
具体地，阵列基板7形成在阵列基板偏振片8上。像素电极5和公共电极6同层设置。具有像素电极5和公共电极6的图形形成在阵列基板7上，并且像素电极5和公共电极6相间排列。蓝相液晶层4形成在上述具有像素电极5和公共电极6的图形上。具有多个视角切换电极3的图形形成在蓝相液晶层4上。彩膜基板2形成在上述具有多个视角切换电极3的图形上。彩膜基板偏振片1形成在彩膜基板2上。
在本实施例中，各个视角切换电极3的设置位置需满足以下条件：每个像素电极5的正上方和每个公共电极6的正上方均对应设置有一个视角切换电极3。换言之，每个视角切换电极3的正下方都存在一个像素电极5或者公共电极6与其对应设置。
当不对视角切换电极3施加偏置电压(即控制视角切换电极3悬空)时，视角切换电 极3不会对蓝相液晶显示装置的显示效果产生任何影响。参照图4，当液晶显示装置为暗态显示时，蓝相液晶层4的所有蓝相液晶分子都保持光学各向同性。此时，蓝相液晶显示装置工作在宽视角模式下。
当向与像素电极5相对应的视角切换电极3施加不等于像素电压的第一偏置电压，且向与公共电极6相对应的视角切换电极3施加不等于公共电压的第二偏置电压时，就可在每个视角切换电极3和与该视角切换电极3相对应的像素电极5或者公共电极6之间形成竖直电场。
图5示出了本发明实施例蓝相液晶显示装置在暗态显示时，在对视角切换电极3施加偏置电压的情况下的状态示意图。如图5所示，当向像素电极5施加的像素电压等于向公共电极6施加的公共电压时，蓝相液晶显示装置处于暗态显示状态。如果此时向与像素电极5相对应的视角切换电极3施加不等于像素电压的第一偏置电压，且向与公共电极6相对应的视角切换电极3施加不等于公共电压的第二偏置电压，就会在每个视角切换电极3和与该视角切换电极3相对应的像素电极5或者公共电极6之间产生竖直电场。
位于竖直电场中的蓝相液晶分子在竖直电场的作用下产生竖直方向的相位延迟，从而使得这些蓝相液晶分子沿竖直电场的方向垂直取向。竖直电场外的蓝相液晶分子仍然保持光学各向同性。从图5中可以清楚地看出，由竖直排列的蓝相液晶分子构成的阵列与由保持光学各向同性的蓝相液晶分子构成的阵列相间排列。图6示出了图4中所示的蓝相液晶显示装置的可切换区域的示意图。参照图6，几乎所有的斜射光线都会穿过竖直排列的蓝相液晶分子。因此，本实施例所述的蓝相液晶显示装置能够大幅减少出现视角切换死区的机率，提高了蓝相液晶显示装置在窄视角模式下的显示效果。
在本发明一优选的实施例中，在保证第一偏置电压不等于像素电压，并保证第二偏置电压不等于公共电压的基础上，使第一偏置电压和第二偏置电压都等于像素电压和公共电压的平均值。在本实施例中，由于向所有视角切换电极3施加同一偏置电压，因此简化了驱动电路。
为了进一步减少出现视角切换死区的机率，可以对电极的属性及设置位置做进一步限定。
在本发明一优选的实施例中，视角切换电极3和与其相对应的像素电极5或者公共电极6平行设置。
在本发明一优选的实施例中，视角切换电极3的宽度和与其相对应的像素电极5或者公共电极6的宽度相等。特别地，视角切换电极3与相对应的像素电极5或者公共电极6沿竖直方向对齐设置。即视角切换电极3的左侧边缘与相对应的像素电极5或者公共电极 6的左侧边缘在同一竖直平面内，并且视角切换电极3的右侧边缘与相对应的像素电极5或者公共电极6的右侧边缘在同一竖直平面内。
在本发明一优选的实施例中，像素电极5的宽度和公共电极6的宽度相等，彼此相邻的像素电极5和公共电极6之间的间距相等。特别地，像素电极5的宽度与上述间距的比值为1/3-3/4。经大量试验证明，当像素电极5的宽度与上述间距的比值满足1/3-3/4时，能够完全消除视角切换死区。在具体实施过程中，像素电极5的宽度可选为2-3μm，像素电极5和公共电极6之间的间距可选为4-6μm。例如，像素电极5的宽度为2μm时，上述间距为4μm。再例如，像素电极5的宽度为3μm时，上述间距为6μm。
进一步地，视角切换电极3、像素电极5和公共电极6均为透明电极。这里，透明电极优选为氧化铟锡(Indium Tin Oxide,ITO)透明电极、氧化铟锌(Indium Zinc Oxide,IZO)透明电极和氧化铟镓(Indium Gallium Oxide,IGO)透明电极中的一种或其组合。
在本发明一优选的实施例中，上述蓝相液晶显示装置还包括驱动电路。驱动电路用于控制像素电极5、公共电极6和视角切换电极3的上电状态。
具体地，在宽视角模式下，驱动电路控制视角切换电极3悬空，即禁止向视角切换电极3供电。
在窄视角模式下，驱动电路设置为向与像素电极5相对应的视角切换电极3提供大于或者小于像素电压的第一偏置电压，并向与所述公共电极6相对应的视角切换电极3提供大于或者小于公共电压的第二偏置电压，从而使得视角切换电极3和与该视角切换电极3相对应的像素电极5或者公共电极6之间形成竖直电场。特别地，第一偏置电压和第二偏置电压均等于像素电压和公共电压的平均值。
值得注意的是，由于采用蓝相液晶层4，因此本实施例的蓝相液晶显示装置具有以下三条革命性的特点。第一，在未施加偏置电压的情况下，蓝相液晶分子始终保持光学各向同性，使得蓝相液晶显示装置具有视野角大，暗态好的特点。第二，蓝相液晶显示装置的理论响应时间可达到毫秒级以下，大大提高了响应速度。第三，在未施加偏置电压的情况下，由于具有高分子稳定性的蓝相液晶分子始终保持光学各向同性，因此蓝相液晶显示装置无需配置取向层，从而在降低了制造成本的同时简化了制造工艺。
相应地，本发明实施例还提供了一种用于驱动上述蓝相液晶显示装置的方法。
如图7所示，是本发明实施例蓝相液晶显示装置的驱动方法的流程示意图。本实施例用于驱动液晶显示装置的方法，主要包括步骤101、步骤102和步骤103。
在步骤101中，判断蓝相液晶显示装置是否处于宽视角模式。
在步骤102中，判断出蓝相液晶显示装置处于宽视角模式时，控制视角切换电极3 悬空。然后退出。
具体地，在本步骤中，蓝相液晶显示装置工作在宽视角模式下，由于视角切换电极3处于悬空状态，因此视角切换电极3不会对蓝相液晶显示装置的显示效果产生任何影响。
在步骤103中，判断出蓝相液晶显示装置未处于宽视角模式时，确定蓝相液晶显示装置处于窄视角模式。在窄视角模式下，向与像素电极5相对应的视角切换电极3提供大于或者小于像素电压的第一偏置电压，并向与所述公共电极6相对应的视角切换电极3提供大于或者小于公共电压的第二偏置电压，以使视角切换电极3和与该视角切换电极3相对应的像素电极5或者公共电极6之间形成竖直电场。特别地，第一偏置电压和第二偏置电压均等于像素电压和公共电压的平均值。
具体地，向与像素电极5相对应的视角切换电极3提供大于或者小于像素电压的第一偏置电压，并向与所述公共电极6相对应的视角切换电极3提供大于或者小于公共电压的第二偏置电压，会使得各个视角切换电极3和与该视角切换电极3相对应的像素电极5或者公共电极6之间产生竖直电场。位于竖直电场中的蓝相液晶分子在竖直电场的作用下产生竖直方向的相位延迟，从而使得这些蓝相液晶分子沿竖直电场的方向垂直取向。竖直电场外的蓝相液晶分子仍然保持光学各向同性。参照图6，几乎所有的斜射光线都会穿过竖直排列的蓝相液晶分子。因此，应用本实施例所述的驱动方法，能够大幅减少蓝相液晶显示装置出现视角切换死区的机率，提高了蓝相液晶显示装置在窄视角模式下的显示效果。
虽然本发明所公开的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所公开的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本发明的保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (20)

  1. 一种蓝相液晶显示装置，包括：
    阵列基板偏振片；
    形成在所述阵列基板偏振片上的阵列基板；
    形成在所述阵列基板上的像素电极和公共电极，所述像素电极和公共电极相间排列；
    形成在所述像素电极和公共电极上的蓝相液晶层；
    形成在所述蓝相液晶层上的多个视角切换电极，每个所述像素电极的正上方和每个所述公共电极的正上方均对应设置有一所述视角切换电极；
    形成在所述视角切换电极上的彩膜基板；以及
    形成在所述彩膜基板上的彩膜基板偏振片。
  2. 根据权利要求1所述的蓝相液晶显示装置，其中，所述视角切换电极、所述像素电极和所述公共电极均为透明电极。
  3. 根据权利要求1所述的蓝相液晶显示装置，其中，还包括驱动电路；
    所述驱动电路设置为在窄视角模式下向与所述像素电极相对应的视角切换电极提供大于或者小于像素电压的第一偏置电压，并向与所述公共电极相对应的视角切换电极提供大于或者小于公共电压的第二偏置电压，以使所述视角切换电极和与其相对应的所述像素电极或者所述公共电极之间形成竖直电场。
  4. 根据权利要求3所述的蓝相液晶显示装置，其中，所述第一偏置电压和所述第二偏置电压均等于所述像素电压和所述公共电压的平均值。
  5. 根据权利要求1所述的蓝相液晶显示装置，其中，所述视角切换电极和与其相对应的所述像素电极或者所述公共电极平行设置。
  6. 根据权利要求5所述的蓝相液晶显示装置，其中，所述视角切换电极、所述像素电极和所述公共电极均为透明电极。
  7. 根据权利要求5所述的蓝相液晶显示装置，其中，还包括驱动电路；
    所述驱动电路设置为在窄视角模式下向与所述像素电极相对应的视角切换电极提供大于或者小于像素电压的第一偏置电压，并向与所述公共电极相对应的视角切换电极提供大于或者小于公共电压的第二偏置电压，以使所述视角切换电极和与其相对应的所述像素电极或者所述公共电极之间形成竖直电场。
  8. 根据权利要求7所述的蓝相液晶显示装置，其中，所述第一偏置电压和所述第二偏置电压均等于所述像素电压和所述公共电压的平均值。
  9. 根据权利要求5所述的蓝相液晶显示装置，其中，所述视角切换电极的宽度和与 其相对应的所述像素电极或者所述公共电极的宽度相等。
  10. 根据权利要求9所述的蓝相液晶显示装置，其中，所述视角切换电极、所述像素电极和所述公共电极均为透明电极。
  11. 根据权利要求9所述的蓝相液晶显示装置，其中，还包括驱动电路；
    所述驱动电路设置为在窄视角模式下向与所述像素电极相对应的视角切换电极提供大于或者小于像素电压的第一偏置电压，并向与所述公共电极相对应的视角切换电极提供大于或者小于公共电压的第二偏置电压，以使所述视角切换电极和与其相对应的所述像素电极或者所述公共电极之间形成竖直电场。
  12. 根据权利要求11所述的蓝相液晶显示装置，其中，所述第一偏置电压和所述第二偏置电压均等于所述像素电压和所述公共电压的平均值。
  13. 根据权利要求9所述的蓝相液晶显示装置，其中，所述像素电极的宽度和所述公共电极的宽度相等，彼此相邻的所述像素电极和所述公共电极之间的间距相等。
  14. 根据权利要求13所述的蓝相液晶显示装置，其中，所述视角切换电极、所述像素电极和所述公共电极均为透明电极。
  15. 根据权利要求13所述的蓝相液晶显示装置，其中，还包括驱动电路；
    所述驱动电路设置为在窄视角模式下向与所述像素电极相对应的视角切换电极提供大于或者小于像素电压的第一偏置电压，并向与所述公共电极相对应的视角切换电极提供大于或者小于公共电压的第二偏置电压，以使所述视角切换电极和与其相对应的所述像素电极或者所述公共电极之间形成竖直电场。
  16. 根据权利要求15所述的蓝相液晶显示装置，其中，所述第一偏置电压和所述第二偏置电压均等于所述像素电压和所述公共电压的平均值。
  17. 根据权利要求16所述的蓝相液晶显示装置，其中，所述像素电极的宽度与所述间距的比值为1/3-3/4。
  18. 根据权利要求17所述的蓝相液晶显示装置，其特征在于，还包括驱动电路；
    所述驱动电路设置为在窄视角模式下向与所述像素电极相对应的视角切换电极提供大于或者小于像素电压的第一偏置电压，并向与所述公共电极相对应的视角切换电极提供大于或者小于公共电压的第二偏置电压，以使所述视角切换电极和与其相对应的所述像素电极或者所述公共电极之间形成竖直电场。
  19. 一种用于驱动如权利要求1所述的蓝相液晶显示装置的方法，包括：
    在窄视角模式下，向与所述像素电极相对应的视角切换电极提供大于或者小于像素电压的第一偏置电压，并向与所述公共电极相对应的视角切换电极提供大于或者小于公共电 压的第二偏置电压，以使所述视角切换电极和与其相对应的所述像素电极或者所述公共电极之间形成竖直电场。
  20. 根据权利要求19所述的方法，其中，所述第一偏置电压和所述第二偏置电压均等于所述像素电压和所述公共电压的平均值。
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