WO2014190728A1 - 显示装置及显示系统 - Google Patents

显示装置及显示系统 Download PDF

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Publication number
WO2014190728A1
WO2014190728A1 PCT/CN2013/089306 CN2013089306W WO2014190728A1 WO 2014190728 A1 WO2014190728 A1 WO 2014190728A1 CN 2013089306 W CN2013089306 W CN 2013089306W WO 2014190728 A1 WO2014190728 A1 WO 2014190728A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
phase difference
difference plate
crystal phase
polarized light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/089306
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English (en)
French (fr)
Inventor
李云飞
高浩然
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BOE Technology Group Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US14/374,747 priority Critical patent/US9671629B2/en
Publication of WO2014190728A1 publication Critical patent/WO2014190728A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal 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
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • 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
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/50—Phase-only modulation

Definitions

  • Embodiments of the present invention relate to a display device and a display system. Background technique
  • TFT-LCD Thin Film Transistor Liquid Crystal Display
  • Embodiments of the present invention provide a display device and a display system for improving a privacy display effect.
  • An aspect of the invention provides a display device comprising: a liquid crystal display having a backlight and a liquid crystal panel, a first quarter retardation film disposed on a side of the liquid crystal panel facing away from the backlight, and being disposed at the first The quarter retardation film faces away from the first liquid crystal phase difference plate on the side of the liquid crystal panel.
  • the first liquid crystal phase difference plate includes two substrates and a liquid crystal layer between the two substrates, each substrate has a transparent electrode layer on a side facing the liquid crystal layer; the liquid crystal display screen emits a frame and a second type of information The second line polarized light and the first line of the first type of information are polarized, and the transparent electrode layer of each of the first liquid crystal phase difference plates is a surface electrode covering the substrate surface; when the liquid crystal display is first Applying a set voltage signal to the first liquid crystal phase difference plate when the line is polarized, a liquid crystal phase difference plate converts the emitted light of the first linear polarized light through the first quarter retardation film into a first circularly polarized light; when the liquid crystal display screen emits the second linear polarized light, a liquid crystal phase difference plate applies a voltage signal opposite to the set voltage signal, and the first liquid crystal phase difference plate converts the second line polarized light through the first quarter retardation film to the second direction Round polarized light.
  • the pattern colors of the first type information and the second type information are similar.
  • the first type of information may be a secret pattern/random mosaic pattern
  • the second type of information may be a random mosaic pattern/secret pattern.
  • One aspect of the present invention provides a display system comprising any of the above display devices and an analyzer for detecting a circularly polarized light of a first type of rotation.
  • the analyzer may include: a second liquid crystal phase difference plate, a linear polarizing plate, and a second quarter retardation film between the second liquid crystal phase difference plate and the linear polarizing plate, the linear polarizing film A direction perpendicular to a polarization direction of the first line polarization, the second liquid crystal phase difference plate includes two substrates and a liquid crystal layer between the two substrates, each of the substrates facing a side of the liquid crystal layer a transparent electrode layer, wherein the transparent electrode layer of each of the second liquid crystal phase difference plates is a surface electrode covering the substrate surface; and the control device is respectively connected to the liquid crystal display, the first liquid crystal phase difference plate and the second liquid crystal a phase difference plate signal connection, configured to control, when the liquid crystal display screen emits the first line polarization, control a voltage signal applied to the first liquid crystal phase difference plate and the second liquid crystal phase difference plate, when the liquid crystal display screen is emitted In the case of the two-line polarization, the voltage signals applied to the first liquid crystal phase difference plate
  • the analyzer may further include: a second liquid crystal phase difference plate, a linear polarizing plate, and a second quarter retardation film between the second liquid crystal phase difference plate and the linear polarizing plate, the line The polarizing plate is parallel to a polarization direction of the first linear polarization, and the second liquid crystal phase difference plate includes two substrates and a liquid crystal layer between the two substrates, each of the substrates facing the liquid crystal layer a transparent electrode layer, a transparent electrode layer of each substrate of the second liquid crystal phase difference plate is a surface electrode covering the substrate surface; and a control device respectively corresponding to the liquid crystal display, the first liquid crystal phase difference plate and the a liquid crystal phase difference plate signal connection, configured to control a voltage signal applied to the first liquid crystal phase difference plate and the second liquid crystal phase difference plate when the liquid crystal display screen emits the first line polarization, when the liquid crystal display When the second line polarization is emitted, the voltage signals applied to the first liquid crystal phase difference plate and the second liquid crystal phase difference plate are controlled to be
  • Another aspect of the present invention provides a display device including: having a backlight and a liquid crystal surface The liquid crystal display of the panel, the first quarter retardation film disposed on a side of the liquid crystal panel facing away from the backlight, and the first liquid crystal phase difference plate disposed on a side of the first quarter retardation film facing away from the liquid crystal panel.
  • the first liquid crystal phase difference plate includes two substrates and a liquid crystal layer between the two substrates, each of the substrates has a transparent electrode layer on a side facing the liquid crystal layer; a first line polarization of the class information and a second line polarization of the second type of information, wherein the transparent electrode layer of one of the substrates of the first liquid crystal phase difference plate has a plurality of row/column positions corresponding to the first type of information a first strip electrode having a plurality of second strip electrodes corresponding to the row/column position of the second type of information, and a transparent electrode layer of the other substrate is a surface electrode covering the substrate surface;
  • the first strip electrode applies a set voltage signal, and a voltage signal opposite to the set voltage signal is applied to the second strip electrode, the first liquid crystal phase difference plate polarizes the first line through the first The emitted light of one quarter retardation film is converted into the first circularly polarized light; the first liquid crystal phase difference plate converts the second linear polarized light into the first quarter
  • the pattern colors of the first type information and the second type information are similar.
  • the first type of information may be a secret pattern/random mosaic pattern
  • the second type of information may be a random mosaic pattern/secret pattern.
  • Another aspect of the present invention provides a display system comprising any of the above display devices and an analyzer for detecting a circularly polarized light of a first type of rotation.
  • the analyzer may include: a second liquid crystal phase difference plate, a linear polarizing plate, and a second quarter retardation film between the second liquid crystal phase difference plate and the linear polarizing plate, the line
  • the polarizing plate is perpendicular to a polarization direction of the first linear polarization
  • the second liquid crystal phase difference plate includes two substrates and a liquid crystal layer between the two substrates, each of the substrates facing the liquid crystal layer One side has a transparent electrode layer
  • the transparent electrode layer of one of the substrates of the second liquid crystal phase difference plate has a plurality of first strip electrodes corresponding to the row/column position of the first type of information, and has a plurality of second strip electrodes corresponding to the row/column position of the second type of information, and a transparent electrode layer of the other substrate is a surface electrode covering the substrate surface; and a control device, respectively, and the liquid crystal display,
  • the liquid crystal phase difference plate and the second liquid crystal phase difference plate are connected to each other for controlling the voltage signals of
  • the analyzer may further include: a second liquid crystal phase difference plate, a linear polarizing plate, and a bit a second quarter retardation film between the second liquid crystal phase difference plate and the linear polarizing plate, wherein the linear polarizing plate is parallel to a polarization direction of the first linear polarized light, and the second liquid crystal phase difference plate includes Two substrates and a liquid crystal layer between the two substrates, each of the substrates having a transparent electrode layer on a side facing the liquid crystal layer, and a transparent electrode layer of one of the substrates of the second liquid crystal phase difference plate Having a plurality of first strip electrodes corresponding to the row/column position of the first type of information, and having a plurality of second strip electrodes corresponding to the row/column position of the second type of information, a transparent electrode layer of a substrate is a surface electrode covering the surface of the substrate; and a control device is respectively connected to the liquid crystal display, the first liquid crystal phase difference plate and the second liquid crystal phase difference plate for controlling the
  • the analyzer may be an analyzer lens.
  • the first line polarized light of the first type of information emitted by the liquid crystal display and the second line polarized light of the second type of information are passed through the first quarter retardation film and then passed through the first liquid crystal phase difference plate. After that, it becomes the superimposed light of two kinds of circularly polarized lights, and the screen is a state in which the pattern of the first type of information and the pattern of the second type of information are superimposed, so that the observer cannot see the effective on the screen when watching the eye.
  • Image information if one of the first type of information or the second type of information is confidential information, the display device of the present invention will greatly improve the security effect of the display device.
  • FIG. 1a and 1b are respectively schematic views of the first embodiment of the display device of the present invention under different voltage states
  • FIG. 2 is a waveform diagram of a periodic voltage applied to a liquid crystal phase difference plate according to a first embodiment of the display device of the present invention
  • 3a and 3b are diagrams showing the first embodiment of the display system of the present invention in different voltage states
  • FIG. 4a is a schematic structural view of a second embodiment of the display device of the present invention.
  • FIG. 4b is a parallel strip-shaped electric device.
  • FIG. 5 is a voltage wave of a liquid crystal phase difference plate according to a second embodiment of the display device of the present invention
  • FIG. 6 is a schematic structural view of a second embodiment of the display system of the present invention
  • the liquid crystal display screen displays the first type of information and the second type of information, and the light of the backlight becomes linearly polarized after passing through the liquid crystal panel, and the linear polarized light is changed by the first quarter retardation film. It is a left-handed circularly polarized or right-handed circularly polarized light, and then becomes a superposed left-handed polarized light and right-handed polarized light after passing through a first liquid crystal phase difference plate to which a voltage is applied.
  • the effective information displayed on the screen cannot be recognized.
  • the secret person uses an analyzer having left-hand circular polarization or right-hand circular polarization, one type of information can be identified, thereby improving the effect of the secret display.
  • the linearly polarized light is linearly polarized light;
  • the circularly polarized light that is, the circularly polarized light, has two kinds of directions of rotation, which are left-handed circularly polarized light and right-handed circularly polarized light, that is, the first mentioned in the present disclosure.
  • a circularly polarized light and a second circularly polarized light are two kinds of directions of rotation, which are left-handed circularly polarized light and right-handed circularly polarized light, that is, the first mentioned in the present disclosure.
  • the display device includes a liquid crystal display having a backlight (not shown) and a liquid crystal panel 1, and further comprising: a first quarter retardation film 2 disposed on a side of the liquid crystal panel 1 facing away from the backlight, and setting The first quarter retardation film 2 faces the first liquid crystal phase difference plate 3 on the side of the liquid crystal panel 1.
  • the first liquid crystal phase difference plate 3 includes two substrates 4 and a liquid crystal layer 5 between the two substrates 4, each of which has a transparent electrode layer on a side facing the liquid crystal layer 5.
  • the liquid crystal display screen emits a second line of polarization of the second type of information and a first line of polarization of the first type of information of one frame.
  • the transparent electrode layer of each of the substrates 4 of the first liquid crystal phase difference plate 3 is a surface electrode covering the substrate surface.
  • a set voltage signal is applied to the first liquid crystal phase difference plate 3, and the first liquid crystal phase difference plate 3 polarizes the first line through the first quarter retardation film 2.
  • the emitted light is converted into the first circularly polarized light; when the liquid crystal display emits the second linear polarized light, a voltage signal opposite to the set voltage signal is applied to the first liquid crystal phase difference plate 3, and the first liquid crystal phase difference plate 3 is applied.
  • the second-line polarized light is converted into the second-direction circularly polarized light by the outgoing light of the first quarter retardation film 2.
  • FIG. 1a an optical path diagram of the first type of information is displayed for the liquid crystal panel, and the light 11 of the backlight passes through the liquid crystal panel 1 to become the linear polarized light 12, and then passes through the first quarter.
  • the retardation film 2 causes the 0-light (ordinary light) and the E-light (extra-light) of the linearly polarized light 12 to generate a phase difference of 3 ⁇ /2 or ⁇ /2 to become left-handed circular polarization or right-handed circularly polarized light.
  • the set voltage may preferably be a periodic voltage, and at a high voltage of the periodic voltage, the liquid crystal molecules are oriented parallel to the propagation direction of the incident light.
  • the direction of the circular polarization is constant; at the low voltage of the periodic voltage, the orientation of the liquid crystal molecules is deflected, and the circular polarization is rotated.
  • the period of the periodic voltage coincides with an integral multiple of the frame period of the liquid crystal panel; for example, a synchronizing means may be provided to synchronize the two.
  • a synchronizing means may be provided to synchronize the two.
  • the periodic voltage applied to the first liquid crystal phase difference plate 3 is as shown by the high voltage of FIG. 2, at which time the liquid crystal molecules in the first liquid crystal phase difference plate 3 are aligned perpendicular to the substrate, that is, the liquid crystal molecules are oriented and incident. Since the direction of propagation of the right circularly polarized light 13 is the same, the direction of the circularly polarized light emitted from the first liquid crystal phase difference plate 3 does not change, and is still the right circularly polarized light 14.
  • FIG. 1b an optical path diagram of one frame of interference information is displayed for the liquid crystal panel, and the light 11 of the backlight becomes linearly polarized light 12 through the liquid crystal panel 1, and then becomes left-handed circularly polarized light through the first quarter retardation film 2. Or right-handed circular polarized light.
  • the periodic voltage applied to the liquid crystal phase difference plate 3 is as shown by the low voltage of FIG.
  • the low voltage may be such that no voltage is applied, that is, the voltage value is zero, and the liquid crystal in the first liquid crystal phase difference plate 3 at this time
  • the molecular orientation is deflected, and the liquid crystal molecules are equivalent to one-half of the retardation film. Therefore, the direction of the circularly polarized light emitted from the first liquid crystal phase difference plate 3 is changed to become the left circularly polarized light 15.
  • the observer sees the light superimposed by the left-handed circular polarization and the right-handed circular polarization, that is, the first type of information and the second type.
  • the information is superimposed on the pattern, so the contents of the display cannot be read normally.
  • the high voltage and the low voltage applied to the liquid crystal phase difference plate corresponding to the first type information and the second type information can be converted as long as the first type information and the second type information of the interframe display are from the liquid crystal phase.
  • the direction of the circular polarized light emitted by the difference plate can be different.
  • the liquid crystal display may display the first type information of the second type information inserted into the first frame of the frame, or display the first type information of the second type information inserted into the first frame of the frame, or display the first type of information of the first frame.
  • the second type of information is inserted into the first type of information of the multiframe.
  • the embodiment of the present invention further provides a display system.
  • the first embodiment of the display system includes any of the above display devices and the detection of the circular polarization of the first type of rotation.
  • the analyzer includes: a second liquid crystal phase difference plate 6, a linear polarizing plate 8, and a second quarter retardation film 7 between the second liquid crystal phase difference plate 6 and the linear polarizing plate 8.
  • the transmission axis of the linearly polarizing plate 8 is perpendicular to the polarization direction of the first linearly polarized light 12.
  • the second liquid crystal phase difference plate 6 includes two substrates 4 and a liquid crystal layer 5 between the two substrates 4, each of which has a transparent electrode layer on one side facing the liquid crystal layer 5, and each of the second liquid crystal phase difference plates 6
  • the transparent electrode layer of one substrate 4 is a surface electrode covering the substrate surface;
  • the display system further includes a control device respectively connected to the liquid crystal display and the first liquid crystal phase difference plate
  • control device can be implemented with a general purpose or special purpose computing device (e.g., CPU, DSP, etc.).
  • the first quarter retardation film 2 and the first liquid crystal phase difference plate 3 are passed.
  • the first line polarization becomes the right circular polarization 14, and at this time, the voltage applied to the second liquid crystal phase difference plate 6 is the same as the voltage signal applied by the first liquid crystal phase difference plate 3, and the right circular polarization 14 passes through the second liquid crystal phase.
  • the difference plate 6 and the second quarter retardation film 7 become linearly polarized light 16 perpendicular to the polarization direction of the first linearly polarized light, at which time the light can pass through the linear polarizing plate 8. If the first type of information is confidential, the confidential person can see the confidential information through the analyzer.
  • the liquid crystal panel when the liquid crystal panel emits the second linear polarization of the second type of information, the first quarter retardation film 2 and the first liquid crystal phase difference plate 3 pass through, and the second linear polarization becomes the left circular polarization 15 .
  • the voltage applied to the second liquid crystal phase difference plate 6 is opposite to the voltage signal applied from the first liquid crystal phase difference plate 3, and the left circular circularly polarized light 15 passes through the second liquid crystal phase difference plate 6 and the second quarter retardation film. 7 becomes a linearly polarized light 17 parallel to the polarization direction of the second-line polarized light.
  • the light cannot pass through the linear polarizing plate 8, and the secret person cannot see the second type of information through the analyzer; that is, the secret person can only see The first type of information cannot see the second type of information.
  • the first type of information is set as the confidential information, the confidential person can see the valid information, and the non-confidential person without the analyzer can see the superimposed light of the right-handed circular polarization and the left-handed circular polarization. Identify valid information.
  • the analyzer includes: a second liquid crystal phase difference plate, a linear polarizing plate, and a second quarter retardation film between the second liquid crystal phase difference plate and the linear polarizing plate.
  • the linear polarizing plate is parallel to a polarization direction of the first linear polarized light.
  • the second liquid crystal phase difference plate includes two substrates and a liquid crystal layer between the two substrates, each of the substrates has a transparent electrode layer on a side facing the liquid crystal layer, and the second liquid crystal is in phase difference
  • the transparent electrode layer of each of the substrates of the board is a surface electrode covering the surface of the substrate.
  • the display system further includes a control device respectively connected to the liquid crystal display and the first liquid crystal phase difference plate And a signal connected to the second liquid crystal phase difference plate, configured to control a voltage signal applied by the first liquid crystal phase difference plate and the second liquid crystal phase difference plate when the liquid crystal display screen emits the first line polarization, when the liquid crystal display When the screen emits the second line polarization, the voltage signals applied to the first liquid crystal phase difference plate and the second liquid crystal phase difference plate are controlled to be the same.
  • the control device can be implemented with a general purpose or special purpose computing device (e.g., CPU, DSP, etc.).
  • the display system in this embodiment differs from the display system of the first embodiment in that the polarization directions of the linearly polarizing plates are perpendicular to each other, and the voltage signals applied to the second liquid crystal phase difference plates are opposite.
  • the security personnel with the analyzer can see the second type of information, but cannot see the first type of information.
  • the second type of information is set as the confidential information;
  • the non-confidential personnel still see the superimposed state of the first type of information and the second type of information, and cannot identify valid information.
  • an analyzer for use with the display device, so that a group that needs to observe the confidential information is carried to facilitate the viewing of the confidential information.
  • the analyzer needs to have the polarization state of the outgoing light corresponding to the secret information. For example, if the emitted light with the secret information is a right-handed circular polarized light, a right-handed circular polarization analyzer is required.
  • the type of analyzer can be varied, such as an analyzer lens with a handle, as long as the human eye can view the screen of the display device through the analyzer lens.
  • a display device includes a liquid crystal display having a backlight (not shown) and a liquid crystal panel 1, and further includes: disposed on a side of the liquid crystal panel 1 facing away from the backlight
  • the first quarter retardation film 2 and the first liquid crystal phase difference plate 3 disposed on the side of the first quarter retardation film 2 facing away from the liquid crystal panel 1.
  • the first liquid crystal phase difference plate 3 includes two substrates 4 and a liquid crystal layer 5 between the two substrates 4, each of which has a transparent electrode layer on a side facing the liquid crystal layer 5.
  • the first display of the first type of information and the second line of the second type of information are listed in the liquid crystal display, and the transparent electrode layer of one of the substrates of the first liquid crystal phase difference plate 3 has the same type as the first type a plurality of first strip electrodes corresponding to the row/column position of the information, and having a plurality of second strip electrodes corresponding to the row/column position of the second type of information, and the transparent electrode layer of the other substrate is Cover the surface electrode of the substrate surface.
  • the plurality of first strip electrodes are, for example, parallel to each other and spaced apart by a distance; the plurality of second strip electrodes are, for example, parallel to each other and spaced apart by a distance.
  • the striped portions indicate strip electrode voltages formed in parallel with each other.
  • the first liquid crystal phase difference plate 3 polarizes the first line
  • the emitted light passing through the first quarter retardation film 2 is converted into the first circularly polarized light; the first liquid crystal The phase difference plate 3 converts the second line polarized light through the first quarter retardation film 2 into the second direction circularly polarized light.
  • the light 11 of the backlight (generally equivalent to natural light) becomes linearly polarized light 12 through the liquid crystal panel 1, and becomes left-handed circularly polarized or right-handed circularly polarized light through the first quarter retardation film 2.
  • a set voltage signal is applied to the first strip electrode of the first liquid crystal phase difference plate 3 if the voltage is taken as a high voltage, the liquid crystal molecules of the row/column corresponding to the first type of information are oriented parallel to the incident light.
  • the direction of the circular polarization is constant; when a voltage signal opposite to the set voltage signal is applied to the second strip electrode of the first liquid crystal phase difference plate 3, the liquid crystal molecular orientation is deflected by taking a low voltage.
  • the direction of the circular polarization is reversed.
  • only the light emitted from the first quarter retardation film is right-circularly polarized, and the display of the first type information and the second type information is exemplified by row arrangement.
  • the row in which the first type of information is displayed on the liquid crystal display corresponds to the first strip electrode of the substrate in the first liquid crystal phase difference plate 3.
  • Applying a set voltage signal to the first strip electrode the waveform of the applied voltage signal is as shown by the first voltage signal 21 in FIG. 5, and the liquid crystal molecules of the row of the liquid crystal layer 5 corresponding to the first type of information are oriented parallel to the right circular circle.
  • the row in which the second type of information is displayed on the liquid crystal display corresponds to the second strip electrode of the substrate in the first liquid crystal phase difference plate 3.
  • a voltage signal opposite to the set voltage signal is applied to the second strip electrode, such as the second voltage signal 22 in FIG.
  • the liquid crystal molecules corresponding to the second strip electrode are twisted, and at this time, the liquid crystal layer functions as a half retardation film, so that the right circular polarized light 13 entering the first liquid crystal phase difference plate 3 becomes a left circular polarized light. 15. Therefore, the observer sees the light superimposed by the right circular polarized light 14 and the left circular polarized light 15 so that the eye cannot be recognized.
  • the display device of the present invention is not limited to the two embodiments described above. As long as the first linear polarizing and the second linear polarized light are applied to the first liquid crystal phase difference plate to which the voltage is applied via the first quarter retardation film, the circularly polarized light of different directions may be changed.
  • the first type of information and the second type of information are displayed at intervals of one frame, and may also be displayed at intervals of two or more frames, as long as the human eye cannot recognize the time during multiple scanning and one frame;
  • the first type information and the second type information may be displayed not only in the interline, but also the first type information and the second type information may be displayed in the interline, or may be displayed in two rows or two columns at intervals.
  • the strip-shaped transparent electrodes are disposed in the column of the first type of information corresponding to the substrate. Therefore, various embodiments can be derived from the design concept of the present invention. In the technical solutions of the embodiments, the emitted light emitted from the liquid crystal phase difference plate is superimposed light of left-handed and right-handed circularly polarized light, which cannot be recognized by the eye, thereby improving Shows the privacy effect.
  • the embodiment of the present invention provides a display system.
  • the second embodiment of the display system of the present invention includes the display device of the second embodiment described above and the detection of the circularly polarized light for detecting the first type of rotation.
  • the analyzer includes: a second liquid crystal phase difference plate 6, a linear polarizing plate 8, and a second quarter retardation film 7 between the second liquid crystal phase difference plate 6 and the linear polarizing plate 8.
  • the linearly polarizing plate 8 is perpendicular to the polarization direction of the first linearly polarized light.
  • the second liquid crystal phase difference plate 6 includes two substrates 4 and a liquid crystal layer 5 between the two substrates 4, each of which has a transparent electrode layer on a side facing the liquid crystal layer 5,
  • the transparent electrode layer of one of the substrates 4 of the second liquid crystal phase difference plate 6 has a plurality of first strip electrodes corresponding to the row/column position of the first type of information, and has the second type information
  • a plurality of second strip electrodes corresponding to the row/column position, and a transparent electrode layer of the other substrate 4 is a surface electrode covering the substrate surface.
  • the display system of this embodiment further includes control means respectively connected to the liquid crystal display, the first liquid crystal phase difference plate 3 and the second liquid crystal phase difference plate 6 for controlling the first strip of the first liquid crystal phase difference plate 3
  • the shape electrode is the same as the voltage signal of the first strip electrode of the second liquid crystal phase difference plate 6, and is used to control the second strip electrode of the first liquid crystal phase difference plate 3 and the second strip shape of the second liquid crystal phase difference plate 6.
  • the voltage signal of the electrodes is reversed.
  • the control device can be implemented with a general purpose or special purpose computing device (e.g., CPU, DSP, etc.).
  • the first quarter retardation film 2 and the first liquid crystal phase difference plate 3 are passed.
  • the first line polarization becomes the right circular polarization 14, and at this time, the voltage applied to the first strip electrode of the second liquid crystal phase difference plate 6 and the voltage signal applied to the first strip electrode of the first liquid crystal phase difference plate 3
  • the right circularly polarized light 14 passes through the second liquid crystal phase difference plate 6 and the second quarter retardation film 7 to become a linearly polarized light 18 perpendicular to the polarization direction of the first linearly polarized light, and the light can be linearly polarized.
  • Slice 8 If the first type of information is confidential, the confidential person can see the confidential information through the analyzer.
  • the liquid crystal panel When the liquid crystal panel emits the second linear polarization of the second type of information, the first quarter retardation film 2 and the first liquid crystal phase difference plate 3 pass through, and the first linear polarization changes to the left circular polarization 15 , at this time, The voltage applied by the second strip electrode of the two liquid crystal phase difference plates 6 and the second strip electrode of the first liquid crystal phase difference plate 3 The applied voltage signal is reversed, and the left circularly polarized light 15 passes through the second liquid crystal phase difference plate 6 and the second quarter retardation film 7 to become linearly polarized light 19 parallel to the polarization direction of the second linearly polarized light, at which time the light cannot pass.
  • the secret person cannot see the second type of information through the analyzer; that is, the secret person can only see the first type of information, and cannot see the second type of information.
  • the first type of information is set as the confidential information
  • the confidential person can see the valid information
  • the non-confidential person without the analyzer can see the superimposed light of the right-handed circular polarization and the left-handed circular polarization. Identify valid information.
  • the embodiment of the invention further provides a display system comprising the display device of the second embodiment and an analyzer for detecting a circularly polarized light of the first type of rotation.
  • the analyzer includes: a second liquid crystal phase difference plate, a linear polarizing plate, and a second quarter retardation film between the second liquid crystal phase difference plate and the linear polarizing plate, the linear polarizing film and the The polarization direction of the first linear polarization is parallel, and the second liquid crystal phase difference plate includes two substrates and a liquid crystal layer between the two substrates, each of the substrates having transparency on a side facing the liquid crystal layer
  • the electrode layer, the transparent electrode layer of one of the substrates of the second liquid crystal phase difference plate has a plurality of first strip electrodes corresponding to the row/column position of the first type of information, and has the second A plurality of second strip electrodes corresponding to the row/column position of the class information, and a transparent electrode layer of the other substrate is a surface electrode covering the substrate surface.
  • the display system of this embodiment further includes control means respectively connected to the liquid crystal display, the first liquid crystal phase difference plate and the second liquid crystal phase difference plate signal for controlling the first strip shape of the first liquid crystal phase difference plate
  • the electrode is opposite to the voltage signal of the first strip electrode of the second liquid crystal phase difference plate, and is used for controlling the voltage signal of the second strip electrode of the first liquid crystal phase difference plate and the second strip electrode of the second liquid crystal phase difference plate the same.
  • the control device can be implemented with a general purpose or special purpose computing device (e.g., CPU, DSP, etc.).
  • the difference between the display system of the present embodiment and the second embodiment of the display system is that the linear polarizing plate is parallel to the polarization direction of the first linear polarized light, and the voltage signals applied to the first strip electrodes of the two are opposite.
  • the second strip electrode applies the same voltage signal.
  • the security personnel with the analyzer can see the second type of information, but cannot see the first type of information.
  • the second type of information is set as the confidential information;
  • the non-confidential personnel still see the superimposed state of the first type of information and the second type of information, and cannot identify valid information.
  • the pattern colors of the first type information and the second type information described in all of the above embodiments are similar.
  • the second type of information is an interference signal.
  • the pattern of the interference information can be appropriately selected. In principle, a pattern similar to or similar to the pattern color of the confidential information should be selected, so that a good interference effect can be obtained. If improperly selected, the color pattern of the secret pattern and the interference pattern are greatly different, which makes the observer of the eye can see the confidential information faintly.
  • the first type of information is a secret pattern/random mosaic pattern
  • the second type of information is a random mosaic pattern/secret pattern
  • the pattern of the interference information may be various, preferably a random Marseille pattern, and the mosaic pattern has a good shielding effect, and is suitable as a dry information.
  • display modes of display devices mainly include TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, IPS (In-Plane-Switching) mode, and AD-SDS (ADvanced Super).
  • TN Transmission Nematic
  • VA Very Alignment
  • IPS In-Plane-Switching
  • AD-SDS ADvanced Super
  • Dimension Switch advanced super-dimensional field conversion technology, also known as ADS) mode
  • OCB Optically Compensated Bend
  • the OCB mode is widely used because of its improved viewing angle characteristics and high response speed.
  • the liquid crystal phase difference plate can adopt the above display mode, but the liquid crystal phase difference of the OCB mode is preferred. board.
  • the analyzer may be an analyzer lens.
  • the analyzer in order to make the analyzer more convenient to use, can be designed as an analyzer lens, and the observer can conveniently observe the confidential information in the display device by wearing the analyzer glasses.

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Abstract

一种显示装置及显示系统，显示装置包括：具有背光源和液晶面板（1）的液晶显示屏，设置于液晶面板（1）背离背光源一侧的第一四分之一相位差膜（2），以及设置于第一四分之一相位差膜（2）背离液晶面板（1）一侧的第一液晶相位差板（3）；液晶显示屏出射第一类信息的第一线偏光和第二类信息的第二线偏光，当对液晶相位差板（3）施加电压时，第一线偏光和第二线偏光经过第一四分之一相位差膜（2）再经第一液晶相位差板（3）的出射光变为不同旋向的圆偏光的叠加光。显示装置使人裸眼不能识别有效的图像信息，大大提高了保密显示效果。

Description

显示装置及显示系统 技术领域
本发明的实施例涉及一种显示装置及显示系统。 背景技术
在平板显示装置中， 薄膜晶体管液晶显示器（Thin Film Transistor Liquid Crystal Display, TFT-LCD )具有体积小、 功耗低、 制造成本相对较低和无辐 射等特点， 在当前的平板显示器市场占据了主导地位。
使用液晶显示器显示保密信息也逐步进入人们的视线。 保密信息需要对 一定群体保密， 而保密信息也需要在一定的场合进行查看。 在查看保密信息 的时候， 如果有不能查看保密信息的群体在场， 则最好使得这些群体无法看 到保密信息， 才能达到最好的保密效果。
目前， 已有通过减小液晶显示器的视角来实现保密显示的装置， 即将显 示器的视角做得很小， 使坐在显示器正前方的人能看到显示器上的内容， 而 坐在周围的人不能看到显示器上的内容。 但是这种保密显示装置存在一定的 缺陷， 即若周围的人站在观察者的后方， 还是能看到显示器的内容的， 因此 这种保密显示装置的保密效果较差。 发明内容
本发明的实施例提供一种显示装置及显示系统，用以提高保密显示效果。 本发明的一个方面提供了一种显示装置， 包括： 具有背光源和液晶面板 的液晶显示屏， 设置于液晶面板背离背光源一侧的第一四分之一相位差膜， 以及设置于第一四分之一相位差膜背离液晶面板一侧的第一液晶相位差板。 所述第一液晶相位差板包括两个基板以及位于两个基板之间的液晶层， 每个 基板在朝向液晶层的一面具有透明电极层； 所述液晶显示屏间隔出射一帧第 二类信息的第二线偏光和一帧第一类信息的第一线偏光， 所述第一液晶相位 差板的每一个基板的透明电极层为覆盖基板面的面电极； 当所述液晶显示屏 出射第一线偏光时， 对所述第一液晶相位差板施加设定的电压信号， 所述第 一液晶相位差板将第一线偏光经第一四分之一相位差膜的出射光转变为第一 种旋向的圓偏光； 当所述液晶显示屏出射第二线偏光时， 对所述第一液晶相 位差板施加与设定的电压信号相反的电压信号， 所述第一液晶相位差板将第 二线偏光经第一四分之一相位差膜的出射光转变为第二种旋向的圓偏光。
例如， 该显示装置中， 所述第一类信息和第二类信息的图案色彩相近。 例如， 该显示装置中， 所述第一类信息可以为保密图案 /随机的马赛克图 案， 对应地所述第二类信息可以为随机的马赛克图案 /保密图案。
本发明的一个方面提供了一种显示系统， 包括上述任一种显示装置及用 于检偏第一种旋向的圓偏光的检偏器。
例如， 所述检偏器可以包括： 第二液晶相位差板、 线偏振片以及位于第 二液晶相位差板和线偏振片之间的第二四分之一相位差膜， 所述线偏振片与 所述第一线偏光的偏振方向垂直， 所述第二液晶相位差板包括两个基板以及 位于两个所述基板之间的液晶层， 每个所述基板在朝向所述液晶层的一面具 有透明电极层， 所述第二液晶相位差板的每一个基板的透明电极层为覆盖基 板面的面电极； 控制装置， 分别与所述液晶显示屏、 第一液晶相位差板和第 二液晶相位差板信号连接， 用于当所述液晶显示屏出射第一线偏光时， 控制 对第一液晶相位差板和第二液晶相位差板施加的电压信号相同， 当所述液晶 显示屏出射第二线偏光时， 控制对第一液晶相位差板和第二液晶相位差板施 加的电压信号相反。
又例如， 所述检偏器也可以包括： 第二液晶相位差板、 线偏振片以及位 于第二液晶相位差板和线偏振片之间的第二四分之一相位差膜， 所述线偏振 片与所述第一线偏光的偏振方向平行， 所述第二液晶相位差板包括两个基板 以及位于两个所述基板之间的液晶层， 每个所述基板在朝向所述液晶层的一 面具有透明电极层， 所述第二液晶相位差板的每一个基板的透明电极层为覆 盖基板面的面电极； 控制装置， 分别与所述液晶显示屏、 第一液晶相位差板 和第二液晶相位差板信号连接， 用于当所述液晶显示屏出射第一线偏光时， 控制对第一液晶相位差板和第二液晶相位差板施加的电压信号相反， 当所述 液晶显示屏出射第二线偏光时， 控制对第一液晶相位差板和第二液晶相位差 板施加的电压信号相同。
本发明的另一个方面提供了一种显示装置， 包括： 具有背光源和液晶面 板的液晶显示屏、 设置于液晶面板背离背光源一侧的第一四分之一相位差膜 以及设置于第一四分之一相位差膜背离液晶面板一侧的第一液晶相位差板。 所述第一液晶相位差板包括两个基板以及位于两个基板之间的液晶层， 每个 基板在朝向液晶层的一面具有透明电极层；所述液晶显示屏间行 /列出射第一 类信息的第一线偏光和第二类信息的第二线偏光， 所述第一液晶相位差板的 其中一个基板的透明电极层具有与所述第一类信息所在行 /列位置相对应的 多个第一条形电极，并具有与所述第二类信息所在行 /列位置相对应的多个第 二条形电极， 另一个基板的透明电极层为覆盖基板面的面电极； 当对所述第 一条形电极施加设定的电压信号， 并对所述第二条形电极施加与设定的电压 信号相反的电压信号时， 所述第一液晶相位差板将第一线偏光经第一四分之 一相位差膜的出射光转变为第一种旋向的圓偏光； 所述第一液晶相位差板将 第二线偏光经第一四分之一相位差膜的出射光转变为第二种旋向的圓偏光。
例如， 该显示装置中， 所述第一类信息和第二类信息的图案色彩相近。 例如， 该显示装置中， 所述第一类信息可以为保密图案 /随机的马赛克图 案， 对应地所述第二类信息可以为随机的马赛克图案 /保密图案。
本发明的另一个方面提供了一种显示系统， 包括上述任一种显示装置及 用于检偏第一种旋向的圓偏光的检偏器。
例如， 所述检偏器可以包括： 第二液晶相位差板、 线偏振片以及位于所 述第二液晶相位差板和线偏振片之间的第二四分之一相位差膜， 所述线偏振 片与所述第一线偏光的偏振方向垂直， 所述第二液晶相位差板包括两个基板 以及位于两个所述基板之间的液晶层， 每个所述基板在朝向所述液晶层的一 面具有透明电极层， 所述第二液晶相位差板的其中一个基板的透明电极层具 有与所述第一类信息所在行 /列位置相对应的多个第一条形电极，并具有与所 述第二类信息所在行 /列位置相对应的多个第二条形电极，另一个基板的透明 电极层为覆盖基板面的面电极； 控制装置， 分别与所述液晶显示屏、 第一液 晶相位差板和第二液晶相位差板信号连接， 用于控制第一液晶相位差板的第 一条形电极与第二液晶相位差板的第一条形电极的电压信号相同， 并用于控 制第一液晶相位差板的第二条形电极与第二液晶相位差板的第二条形电极的 电压信号相反。
又例如， 所述检偏器也可以包括： 第二液晶相位差板、 线偏振片以及位 于第二液晶相位差板和线偏振片之间的第二四分之一相位差膜， 所述线偏振 片与所述第一线偏光的偏振方向平行， 所述第二液晶相位差板包括两个基板 以及位于两个所述基板之间的液晶层， 每个所述基板在朝向所述液晶层的一 面具有透明电极层， 所述第二液晶相位差板的其中一个基板的透明电极层具 有与所述第一类信息所在行 /列位置相对应的多个第一条形电极，并具有与所 述第二类信息所在行 /列位置相对应的多个第二条形电极，另一个基板的透明 电极层为覆盖基板面的面电极； 控制装置， 分别与所述液晶显示屏、 第一液 晶相位差板和第二液晶相位差板信号连接， 用于控制第一液晶相位差板的第 一条形电极与第二液晶相位差板的第一条形电极的电压信号相反， 并用于控 制第一液晶相位差板的第二条形电极与第二液晶相位差板的第二条形电极的 电压信号相同。
例如， 所述检偏器可以为检偏眼镜。
在本发明的实施例中， 由于液晶显示屏出射的第一类信息的第一线偏光 和第二类信息的第二线偏光经第一四分之一相位差膜再经第一液晶相位差板 后变为两种旋向的圓偏光的叠加光， 屏幕上为第一类信息的图案和第二类信 息的图案叠加的状态， 因此， 观察者棵眼观看时， 无法看到屏幕上的有效的 图像信息， 若第一类信息或第二类信息中一种为保密信息， 则采用本发明的 显示装置将大大提高显示装置的保密效果。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例的附图作 筒单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例， 而非对本发明的限制。
图 la和图 lb分别为本发明的显示装置第一实施例在不同电压状态下的 示意图；
图 2为本发明的显示装置第一实施例对液晶相位差板施加的周期性电压 的波形图；
图 3a和图 3b分别为本发明的显示系统第一实施例在不同电压状态下示 意图；
图 4a为本发明的显示装置第二实施例结构示意图； 图 4b为平行条状电 极的示意图
图 5 为本发明的显示装置第二实施例对液晶相位差板施加的电压波开; 图 6为本发明的显示系统第二实施例结构示意图
附图标记：
1-液晶面板 2-第一四分之一相位差膜 ； -第一液晶相位差板
4-基板 5-液晶层 6-第二液晶相位差板
7-第二四分之一相位差膜 8-线偏振片 11-背光源的光
12-线偏光 13-右旋圓偏光 14-右旋圓偏光
15-左旋圓偏光 16-线偏光 17-线偏光
18-线偏光 21-第一电压信号 22-第二电压信号 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例的附图，对本发明实施例的技术方案进行清楚、 完整地描述。显然， 所描述的实施例是本发明的一部分实施例， 而不是全部的实施例。 基于所描 述的本发明的实施例， 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例， 都属于本发明保护的范围。
除非另作定义， 此处使用的技术术语或者科学术语应当为本发明所属领 域内具有一般技能的人士所理解的通常意义。本公开中使用的 "第一"、 "第 二" 以及类似的词语并不表示任何顺序、 数量或者重要性， 而只是用来区分 不同的组成部分。 同样， "一个" 、 "一" 或者 "该" 等类似词语也不表示 数量限制， 而是表示存在至少一个。 "包括" 或者 "包含" 等类似的词语意 指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及 其等同， 而不排除其他元件或者物件。 "连接" 或者 "相连" 等类似的词语 并非限定于物理的或者机械的连接， 而是可以包括电性的连接， 不管是直接 的还是间接的。
为了提高显示装置的保密效果， 本发明的实施例提供了一种显示装置及 显示系统。 在本发明中， 液晶显示屏显示第一类信息和第二类信息， 背光源 的光通过液晶面板后变为线偏光， 该线偏光通过第一四分之一相位差膜后变 为左旋圓偏光或右旋圓偏光， 再经过施加电压的第一液晶相位差板后变为叠 加的左旋偏振光和右旋偏振光。 由于棵眼不能识别既有左旋圓偏光又有右旋 圓偏光的光线， 因此， 屏幕中显示的有效信息不能被识别。 当保密人员使用 具有左旋圓偏光或右旋圓偏光的检偏器时， 可以识别其中的一类信息， 从而 提高了保密显示的效果。
在本发明下述实施例中， 线偏光即为线偏振光； 圓偏光， 即圓偏振光， 具有两种旋向， 分别为左旋圓偏光和右旋圓偏光， 即本公开所提及的第一种 旋向的圓偏光和第二种旋向的圓偏光。
如图 la和图 lb所示， 本发明的显示装置第一实施例在不同电压状态下 的示意图。 该显示装置包括具有背光源 （图中未标出）和液晶面板 1的液晶 显示屏， 还包括： 设置于液晶面板 1背离背光源一侧的第一四分之一相位差 膜 2, 以及设置于第一四分之一相位差膜 2背离液晶面板 1一侧的第一液晶 相位差板 3。 第一液晶相位差板 3包括两个基板 4以及位于两个基板 4之间 的液晶层 5, 每个基板 4在朝向液晶层 5的一面具有透明电极层。
液晶显示屏间隔出射一帧第二类信息的第二线偏光和一帧第一类信息的 第一线偏光。 第一液晶相位差板 3的每一个基板 4的透明电极层为覆盖基板 面的面电极。
当液晶显示屏出射第一线偏光时， 对第一液晶相位差板 3施加设定的电 压信号， 第一液晶相位差板 3将第一线偏光经第一四分之一相位差膜 2的出 射光转变为第一种旋向的圓偏光； 当液晶显示屏出射第二线偏光时， 对第一 液晶相位差板 3施加与设定的电压信号相反的电压信号， 第一液晶相位差板 3将第二线偏光经第一四分之一相位差膜 2的出射光转变为第二种旋向的圓 偏光。
在本实施例技术方案中，如图 la所示， 为液晶面板显示一帧第一类信息 的光路图， 背光源的光 11经过液晶面板 1变为线偏光 12, 再经过第一四分 之一相位差膜 2使得线偏振光 12的 0光（寻常光）和 E光（非常光）产生 3π/2或 π/2的相位差变为左旋圓偏光或右旋圓偏光。 当对第一液晶相位差板 3 的面电极施加设定的电压信号时， 设定的电压可以优选为周期性电压， 在 周期性电压的高电压时， 液晶分子取向平行于入射光的传播方向， 圓偏光的 旋向不变； 在周期性电压的低电压时， 液晶分子取向发生偏转， 圓偏光的旋 向翻转。 例如， 所述周期性电压的周期与液晶面板的帧周期的整数倍一致； 例如， 还可以提供一个同步装置使得二者同步。 在此， 仅以从第一四分之一 相位差膜出射光为右旋圓偏光 13为例进行说明。此时，对第一液晶相位差板 3施加的周期性电压如图 2的高电压所示， 这时第一液晶相位差板 3中的液 晶分子垂直于基板排列，即液晶分子取向与入射的右旋圓偏光 13的传播方向 相同， 因此， 从第一液晶相位差板 3出射的圓偏光的旋向不变， 仍为右旋圓 偏光 14。
如图 lb所示， 为液晶面板显示一帧干扰信息的光路图， 背光源的光 11 经过液晶面板 1变为线偏光 12,再经过第一四分之一相位差膜 2变为左旋圓 偏光或右旋圓偏光。 在此， 仅以从第一四分之一相位差膜出射光为右旋圓偏 光 13为例进行说明。此时，对液晶相位差板 3施加的周期性电压如图 2的低 电压所示， 该低电压也可以为不施加电压即电压值为零， 这时第一液晶相位 差板 3中的液晶分子取向发生偏转， 液晶分子相当于二分之一相位差膜。 因 此， 从第一液晶相位差板 3出射的圓偏光的旋向改变， 变为左旋圓偏光 15。
因此， 由于显示每一帧的时间 4艮短， 而人眼具有视觉暂留现象， 所以观 察者看到的是左旋圓偏光和右旋圓偏光叠加的光线， 即第一类信息和第二类 信息叠加的图案， 因此不能正常阅读显示屏的内容。 当然， 在本方案中， 第 一类信息和第二类信息对应的对液晶相位差板施加的高电压和低电压可以转 换， 只要间帧显示的第一类信息和第二类信息从液晶相位差板出射的圓偏光 的旋向不同即可。 在本发明的实施例中， 液晶显示屏可以显示多帧第二类信 息插入一帧第一类信息， 也可以显示一帧第二类信息插入一帧第一类信息， 也可以显示一帧第二类信息插入多帧第一类信息。
本发明实施例还提供一种显示系统， 如图 3a或图 3b所示， 该显示系统 的第一实施例包括上述任一种显示装置及用于检偏第一种旋向的圓偏光的检 偏器。 该检偏器包括： 第二液晶相位差板 6、 线偏振片 8, 以及位于第二液晶 相位差板 6和线偏振片 8之间的第二四分之一相位差膜 7。 线偏振片 8的透 射轴与第一线偏光 12的偏振方向垂直。第二液晶相位差板 6包括两个基板 4 以及位于两个基板 4之间的液晶层 5 , 每个基板 4在朝向液晶层 5的一面具 有透明电极层， 第二液晶相位差板 6的每一个基板 4的透明电极层为覆盖基 板面的面电极； 该显示系统还包括控制装置， 其分别与液晶显示屏、 第一液晶相位差板
3和第二液晶相位差板 6信号连接， 用于当所述液晶显示屏出射第一线偏光 时，控制对第一液晶相位差板 3和第二液晶相位差板 6施加的电压信号相同， 当所述液晶显示屏出射第二线偏光时， 控制对第一液晶相位差板 3和第二液 晶相位差板 6施加的电压信号相反。 例如， 该控制装置可以用通用或专用计 算装置（例如 CPU、 DSP等） 实现。
在本实施例的显示系统中，如图 3a所示， 当液晶屏出射第一类信息的第 一线偏光时， 经过第一四分之一相位差膜 2和第一液晶相位差板 3 , 第一线 偏光变为右旋圓偏光 14, 此时， 对第二液晶相位差板 6施加的电压与第一液 晶相位差板 3施加的电压信号相同，右旋圓偏光 14经过第二液晶相位差板 6 和第二四分之一相位差膜 7后变为与第一线偏光的偏振方向垂直的线偏光 16, 此时光线可以通过线偏振片 8。 若第一类信息为保密信息， 从而保密人 员可以透过检偏器看到保密信息。
如图 3b所示， 当液晶屏出射第二类信息的第二线偏光时，经过第一四分 之一相位差膜 2和第一液晶相位差板 3 , 第二线偏光变为左旋圓偏光 15, 此 时， 对第二液晶相位差板 6施加的电压与第一液晶相位差板 3施加的电压信 号相反，左旋圓偏光 15经过第二液晶相位差板 6和第二四分之一相位差膜 7 后变为与第二线偏光的偏振方向平行的线偏光 17,此时光线不能通过线偏振 片 8, 则保密人员透过检偏器不能看到第二类信息； 即保密人员只能看到第 一类信息， 不能看到第二类信息。 此时， 将第一类信息设定为保密信息， 则 保密人员可以看到有效的信息， 而没有检偏器的非保密人员看到的是右旋圓 偏光和左旋圓偏光的叠加光， 不能识别有效的信息。
本发明实施例还提供另一种显示系统， 包括上述的任一种显示装置及用 于检偏第一种旋向的圓偏光的检偏器。 该检偏器包括： 第二液晶相位差板、 线偏振片， 以及位于第二液晶相位差板和线偏振片之间的第二四分之一相位 差膜。 所述线偏振片与所述第一线偏光的偏振方向平行。 所述第二液晶相位 差板包括两个基板以及位于两个所述基板之间的液晶层， 每个所述基板在朝 向所述液晶层的一面具有透明电极层， 所述第二液晶相位差板的每一个基板 的透明电极层为覆盖基板面的面电极。
该显示系统还包括控制装置， 其分别与液晶显示屏、 第一液晶相位差板 和第二液晶相位差板信号连接， 用于当所述液晶显示屏出射第一线偏光时， 控制第一液晶相位差板和第二液晶相位差板施加的电压信号相反， 当所述液 晶显示屏出射第二线偏光时， 控制对第一液晶相位差板和第二液晶相位差板 施加的电压信号相同。 例如， 该控制装置可以用通用或专用计算装置（例如 CPU, DSP等） 实现。
在本实施例中的显示系统与第一实施例的显示系统的区别在于， 线偏振 片的偏振方向相互垂直， 并且对第二液晶相位差板施加的电压信号相反。 在 本实施例中， 具有检偏器的保密人员能看到第二类信息， 但是不能看到第一 类信息， 此时， 就将第二类信息设定为保密信息； 而不具有检偏器的非保密 人员仍然看到的是第一类信息和第二类信息的叠加状态，不能识别有效信息。
在本发明的显示系统实施例中，需要设置与显示装置配套使用的检偏器， 让需要观察到保密信息的群体携带， 以方便看到保密信息。 该检偏器需要与 保密信息对应的出射光的偏振态一致， 比如具有保密信息的出射光为右旋圓 偏光， 则需要配备右旋圓偏振检偏器。 检偏器的形式可以多样， 如具有手柄 的检偏镜片， 只要人眼能透过检偏镜片观察显示装置的屏幕即可。
如图 4a所示， 本发明第二实施例提供的显示装置， 包括具有背光源（图 中未示出）和液晶面板 1的液晶显示屏， 还包括： 设置于液晶面板 1背离背 光源一侧的第一四分之一相位差膜 2, 以及设置于第一四分之一相位差膜 2 背离液晶面板 1一侧的第一液晶相位差板 3。 第一液晶相位差板 3包括两个 基板 4以及位于两个基板 4之间的液晶层 5 , 每个基板 4在朝向液晶层 5的 一面具有透明电极层。液晶显示屏间行 /列出射第一类信息的第一线偏光和第 二类信息的第二线偏光， 第一液晶相位差板 3的其中一个基板的透明电极层 具有与所述第一类信息所在行 /列位置相对应的多个第一条形电极，并具有与 所述第二类信息所在行 /列位置相对应的多个第二条形电极，另一个基板的透 明电极层为覆盖基板面的面电极。 该多个第一条形电极例如彼此平行且间隔 开一定距离分布；该多个第二条形电极例如彼此平行且间隔开一定距离分布。 如图 4b所示， 条紋部分表示彼此平行形成的条状电极电压。
当对所述第一条形电极施加设定的电压信号， 并对所述第二条形电极施 加与设定的电压信号相反的电压信号时， 第一液晶相位差板 3将第一线偏光 经第一四分之一相位差膜 2的出射光转变为第一种旋向的圓偏光； 第一液晶 相位差板 3将第二线偏光经第一四分之一相位差膜 2的出射光转变为第二种 旋向的圓偏光。
在本实施例中， 背光源的光 11 (一般等同于自然光）经过液晶面板 1变 为线偏光 12 ,再经过第一四分之一相位差膜 2变为左旋圓偏光或右旋圓偏光。 当对第一液晶相位差板 3的第一条形电极施加设定的电压信号时， 若取该电 压为高电压，则第一类信息对应的行 /列的液晶分子取向平行于入射光的传播 方向， 圓偏光的旋向不变； 当对第一液晶相位差板 3的第二条形电极施加与 设定的电压信号相反的电压信号时， 取低电压， 则液晶分子取向发生偏转， 圓偏光的旋向翻转。 在此， 仅以从第一四分之一相位差膜出射光为右旋圓偏 光、 且第一类信息和第二类信息的显示以行排列为例进行说明。
液晶显示屏中显示第一类信息的行与第一液晶相位差板 3中基板的第一 条形电极对应。 对第一条形电极施加设定的电压信号， 施加的电压信号波形 如图 5中第一电压信号 21所示，第一类信息对应的液晶层 5的行的液晶分子 取向平行于右旋圓偏光 13的传播方向。 因此，在第一条形电极对应的行的右 旋圓偏光 13的旋向不发生改变， 从第一液晶盒 3 出射出来仍为右旋圓偏光 14。 液晶显示屏中显示第二类信息的行与第一液晶相位差板 3中基板的第二 条形电极对应。 对第二条形电极施加与设定的电压信号相反的电压信号， 如 图 5中第二电压信号 22。 这时与第二条形电极对应的液晶分子扭转， 此时液 晶层相当于二分之一相位差膜的作用， 使得进入第一液晶相位差板 3的右旋 圓偏光 13变为左旋圓偏光 15。 因此， 观察者看到的是右旋圓偏光 14和左旋 圓偏光 15叠加的光线， 进而棵眼不能识别。
本发明显示装置并不受限于上述的两个实施例。 只要对第一线偏光和第 二线偏光经第一四分之一相位差膜再经施加电压的第一液晶相位差板后变为 不同旋向的圓偏光即可。 对于第一实施例， 采取间隔一帧显示第一类信息和 第二类信息， 也可以间隔两帧或多帧显示， 只要在多个扫描一帧的时间内， 人眼无法识别即可； 对于第二实施例， 不仅可以采取间行显示第一类信息和 第二类信息， 也可以采取间列显示第一类信息和第二类信息， 也可以采取间 隔两行或间隔两列显示， 也可以间隔多行或多列显示， 也可以采用一个亚像 素对应两个小行的方式， 一个小行显示第一类信息， 另一个小行显示第二类 信息， 如果采取间列显示第一类信息和第二类信息， 相应的液晶相位差板的 条形透明电极设置于基板对应的第一类信息所在列。 因此， 由本发明的设计 构思可以得出多种实施例， 在这些实施例技术方案中， 从液晶相位差板出射 的出射光为左旋和右旋圓偏光的叠加光， 不能被棵眼识别， 提高了显示保密 效果。
本发明实施例提供一种显示系统， 如图 6所示， 本发明显示系统的第二 实施例包括上述的第二实施例的显示装置及用于检偏第一种旋向的圓偏光的 检偏器。 所述检偏器包括： 第二液晶相位差板 6、 线偏振片 8 , 以及位于第二 液晶相位差板 6和线偏振片 8之间的第二四分之一相位差膜 7。 所述线偏振 片 8与所述第一线偏光的偏振方向垂直。 所述第二液晶相位差板 6包括两个 基板 4以及位于两个所述基板 4之间的液晶层 5 , 每个所述基板 4在朝向所 述液晶层 5的一面具有透明电极层， 所述第二液晶相位差板 6的其中一个基 板 4 的透明电极层具有与所述第一类信息所在行 /列位置相对应的多个第一 条形电极，并具有与所述第二类信息所在行 /列位置相对应的多个第二条形电 极， 另一个基板 4的透明电极层为覆盖基板面的面电极。
本实施例的显示系统还包括控制装置， 其分别与液晶显示屏、 第一液晶 相位差板 3和第二液晶相位差板 6信号连接， 用于控制第一液晶相位差板 3 的第一条形电极与第二液晶相位差板 6的第一条形电极的电压信号相同， 并 用于控制第一液晶相位差板 3的第二条形电极与第二液晶相位差板 6的第二 条形电极的电压信号相反。例如，该控制装置可以用通用或专用计算装置（例 如 CPU、 DSP等） 实现。
在本实施例的显示系统中， 当液晶显示屏一些行 /列出射第一类信息的第 一线偏光时， 经过第一四分之一相位差膜 2和第一液晶相位差板 3 , 第一线 偏光变为右旋圓偏光 14, 此时， 对第二液晶相位差板 6的第一条形电极施加 的电压与第一液晶相位差板 3的第一条形电极施加的电压信号相同， 右旋圓 偏光 14经过第二液晶相位差板 6和第二四分之一相位差膜 7后变为与第一线 偏光的偏振方向垂直的线偏光 18 , 此时光线可以通过线偏振片 8。 若第一类 信息为保密信息， 从而保密人员可以透过检偏器看到保密信息。
当液晶屏出射第二类信息的第二线偏光时， 经过第一四分之一相位差膜 2和第一液晶相位差板 3 , 第一线偏光变为左旋圓偏光 15 , 此时， 对第二液 晶相位差板 6第二条形电极施加的电压与第一液晶相位差板 3第二条形电极 施加的电压信号相反，左旋圓偏光 15经过第二液晶相位差板 6和第二四分之 一相位差膜 7后变为与第二线偏光的偏振方向平行的线偏光 19,此时光线不 能通过线偏振片 8, 则保密人员透过检偏器不能看到第二类信息； 即保密人 员只能看到第一类信息， 不能看到第二类信息。 此时， 将第一类信息设定为 保密信息， 则保密人员可以看到有效的信息， 而没有检偏器的非保密人员看 到的是右旋圓偏光和左旋圓偏光的叠加光， 不能识别有效的信息。
本发明实施例还提供一种显示系统， 包括第二实施例的显示装置及用于 检偏第一种旋向的圓偏光的检偏器。 所述检偏器包括： 第二液晶相位差板、 线偏振片， 以及位于第二液晶相位差板和线偏振片之间的第二四分之一相位 差膜， 所述线偏振片与所述第一线偏光的偏振方向平行， 所述第二液晶相位 差板包括两个基板以及位于两个所述基板之间的液晶层， 每个所述基板在朝 向所述液晶层的一面具有透明电极层， 所述第二液晶相位差板的其中一个基 板的透明电极层具有与所述第一类信息所在行 /列位置相对应的多个第一条 形电极， 并具有与所述第二类信息所在行 /列位置相对应的多个第二条形电 极， 另一个基板的透明电极层为覆盖基板面的面电极。
本实施例的显示系统还包括控制装置， 其分别与所述液晶显示屏、 第一 液晶相位差板和第二液晶相位差板信号连接， 用于控制第一液晶相位差板的 第一条形电极与第二液晶相位差板的第一条形电极的电压信号相反， 并用于 控制第一液晶相位差板的第二条形电极与第二液晶相位差板的第二条形电极 的电压信号相同。例如，该控制装置可以用通用或专用计算装置（例如 CPU、 DSP等） 实现。
在本实施例的显示系统与显示系统的第二实施例的区别在于， 线偏振片 与第一线偏光的偏振方向平行，对两者的第一条形电极施加的电压信号相反， 对两者的第二条形电极施加的电压信号相同。 在该实施例中， 具有检偏器的 保密人员能看到第二类信息， 但是不能看到第一类信息， 此时， 就将第二类 信息设定为保密信息； 而不具有检偏器的非保密人员仍然看到的是第一类信 息和第二类信息的叠加状态， 不能识别有效信息。
例如， 上述所有实施例中所述的第一类信息和第二类信息的图案色彩相 近。
在本发明实施例中， 如果第一类信息为保密信息， 第二类信息为干扰信 息， 则干扰信息的图案可以适当选取， 原则上应选取和保密信息的图案色彩 相似或相近的图案， 这样可以获得很好的干扰效果。 若选取不当， 导致保密 图案和干扰图案色彩相差较大， 会使棵眼的观察者能够依稀看到保密信息。
例如， 第一类信息为保密图案 /随机的马赛克图案， 相对应地， 第二类信 息为随机的马赛克图案 /保密图案。
在本发明实施例中， 干扰信息的图案形式可以有多种， 优选随机的马赛 克图案， 马赛克图案的屏蔽效果好， 适于作为干 4尤信息。
目前， 显示装置的显示模式主要有 TN ( Twisted Nematic, 扭曲向列 )模 式、 VA ( Vertical Alignment, 垂直取向）模式、 IPS ( In-Plane-Switching, 平 面方向转换 )模式和 AD-SDS ( ADvanced Super Dimension Switch, 高级超维 场转换技术， 又筒称 ADS )模式， 以及 OCB ( Optically Compensated Bend, 光学补偿弯曲）模式等。 OCB模式因其具有改进的视角特性以及较高的响应 速度而得到了广泛的应用， 在本发明的实施例中， 液晶相位差板都可以采用 上述的显示模式， 但优选 OCB模式的液晶相位差板。
例如， 所述检偏器可以为检偏眼镜。
在本发明实施例中， 为了使检偏器使用更为方便， 可以将检偏器设计为 检偏眼镜， 观察者可以通过佩戴检偏眼镜方便地观察到显示装置中的保密信 息。
以上所述仅是本发明的示范性实施方式， 而非用于限制本发明的保护范 围， 本发明的保护范围由所附的权利要求确定。

Claims

权利要求书
1、 一种显示装置， 包括：
具有背光源和液晶面板的液晶显示屏，
设置于所述液晶面板背离所述背光源一侧的第一四分之一相位差膜， 以 及
设置于所述第一四分之一相位差膜背离所述液晶面板一侧的第一液晶相 位差板，
其中， 所述第一液晶相位差板包括两个基板以及位于两个所述基板之间 的液晶层， 每个所述基板在朝向所述液晶层的一面具有透明电极层；
所述液晶显示屏间隔出射一帧第二类信息的第二线偏光和一帧第一类信 息的第一线偏光， 所述第一液晶相位差板的每一个基板的透明电极层为覆盖 基板面的面电极；
当所述液晶显示屏出射第一线偏光时， 对所述第一液晶相位差板施加设 定的电压信号， 所述第一液晶相位差板将第一线偏光经第一四分之一相位差 膜的出射光转变为第一种旋向的圓偏光； 当所述液晶显示屏出射第二线偏光 时， 对所述第一液晶相位差板施加与设定的电压信号相反的电压信号， 所述 第一液晶相位差板将第二线偏光经第一四分之一相位差膜的出射光转变为第 二种旋向的圓偏光。
2、如权利要求 1所述的显示装置， 其中， 所述第一类信息和第二类信息 的图案色彩相近。
3、如权利要求 1或 2所述的显示装置， 其中， 所述第一类信息为保密图 案 /随机的马赛克图案， 所述第二类信息为随机的马赛克图案 /保密图案。
4、 一种显示系统， 包括如权利要求 1~3 中任一项所述的显示装置及用 于检偏第一种旋向的圓偏光的检偏器。
5、 如权利要求 4所述的显示系统， 其中， 所述检偏器包括：
第二液晶相位差板、 线偏振片以及位于所述第二液晶相位差板和所述线 偏振片之间的第二四分之一相位差膜， 所述线偏振片与所述第一线偏光的偏 振方向垂直， 所述第二液晶相位差板包括两个基板以及位于两个所述基板之 间的液晶层， 每个所述基板在朝向所述液晶层的一面具有透明电极层， 所述 第二液晶相位差板的每一个基板的透明电极层为覆盖基板面的面电极； 控制装置， 分别与所述液晶显示屏、 第一液晶相位差板和第二液晶相位 差板信号连接， 用于当所述液晶显示屏出射第一线偏光时， 控制对第一液晶 相位差板和第二液晶相位差板施加的电压信号相同， 当所述液晶显示屏出射 第二线偏光时， 控制对第一液晶相位差板和第二液晶相位差板施加的电压信 号相反。
6、 如权利要求 4所述的显示系统， 其中， 所述检偏器包括：
第二液晶相位差板、 线偏振片以及位于所述第二液晶相位差板和所述线 偏振片之间的第二四分之一相位差膜， 所述线偏振片与所述第一线偏光的偏 振方向平行， 所述第二液晶相位差板包括两个基板以及位于两个所述基板之 间的液晶层， 每个所述基板在朝向所述液晶层的一面具有透明电极层， 所述 第二液晶相位差板的每一个基板的透明电极层为覆盖基板面的面电极； 控制装置， 分别与所述液晶显示屏、 第一液晶相位差板和第二液晶相位 差板信号连接， 用于当所述液晶显示屏出射第一线偏光时， 控制对第一液晶 相位差板和第二液晶相位差板施加的电压信号相反， 当所述液晶显示屏出射 第二线偏光时， 控制对第一液晶相位差板和第二液晶相位差板施加的电压信 号相同。
7、 一种显示装置， 包括：
具有背光源和液晶面板的液晶显示屏，
设置于所述液晶面板背离所述背光源一侧的第一四分之一相位差膜， 以 及
设置于所述第一四分之一相位差膜背离所述液晶面板一侧的第一液晶相 位差板，
其中， 所述第一液晶相位差板包括两个基板以及位于两个所述基板之间 的液晶层， 每个所述基板在朝向所述液晶层的一面具有透明电极层；
所述液晶显示屏间行 /列出射第一类信息的第一线偏光和第二类信息的 第二线偏光， 所述第一液晶相位差板的其中一个基板的透明电极层具有与所 述第一类信息所在行 /列位置相对应的多个第一条形电极，并具有与所述第二 类信息所在行 /列位置相对应的多个第二条形电极，另一个基板的透明电极层 为覆盖基板面的面电极； 当对所述第一条形电极施加设定的电压信号， 并对所述第二条形电极施 加与设定的电压信号相反的电压信号时， 所述第一液晶相位差板将第一线偏 光经第一四分之一相位差膜的出射光转变为第一种旋向的圓偏光； 所述第一 液晶相位差板将第二线偏光经第一四分之一相位差膜的出射光转变为第二种 旋向的圓偏光。
8、如权利要求 7所述的显示装置， 其中， 所述第一类信息和第二类信息 的图案色彩相近。
9、如权利要求 7或 8所述的显示装置， 其中， 所述第一类信息为保密图 案 /随机的马赛克图案， 所述第二类信息为随机的马赛克图案 /保密图案。
10、 一种显示系统， 包括如权利要求 7~9中任一项所述的显示装置及用 于检偏第一种旋向的圓偏光的检偏器。
11、 如权利要求 10所述的显示系统， 其中， 所述检偏器包括： 第二液晶相位差板、 线偏振片以及位于所述第二液晶相位差板和所述线 偏振片之间的第二四分之一相位差膜， 所述线偏振片与所述第一线偏光的偏 振方向垂直， 所述第二液晶相位差板包括两个基板以及位于两个所述基板之 间的液晶层， 每个所述基板在朝向所述液晶层的一面具有透明电极层， 所述 第二液晶相位差板的其中一个基板的透明电极层具有与所述第一类信息所在 行 /列位置相对应的多个第一条形电极， 并具有与所述第二类信息所在行 /列 位置相对应的多个第二条形电极， 另一个基板的透明电极层为覆盖基板面的 面电极；
控制装置， 分别与所述液晶显示屏、 第一液晶相位差板和第二液晶相位 差板信号连接， 用于控制第一液晶相位差板的第一条形电极与第二液晶相位 差板的第一条形电极的电压信号相同， 并用于控制第一液晶相位差板的第二 条形电极与第二液晶相位差板的第二条形电极的电压信号相反。
12、 如权利要求 10所述的显示系统， 其中， 所述检偏器包括： 第二液晶相位差板、 线偏振片， 以及位于所述第二液晶相位差板和所述 线偏振片之间的第二四分之一相位差膜， 所述线偏振片与所述第一线偏光的 偏振方向平行， 所述第二液晶相位差板包括两个基板以及位于两个所述基板 之间的液晶层， 每个所述基板在朝向所述液晶层的一面具有透明电极层， 所 述第二液晶相位差板的其中一个基板的透明电极层具有与所述第一类信息所 在行 /列位置相对应的多个第一条形电极， 并具有与所述第二类信息所在行 / 列位置相对应的多个第二条形电极， 另一个基板的透明电极层为覆盖基板面 的面电极；
控制装置， 分别与所述液晶显示屏、 第一液晶相位差板和第二液晶相位 差板信号连接， 用于控制第一液晶相位差板的第一条形电极与第二液晶相位 差板的第一条形电极的电压信号相反， 并用于控制第一液晶相位差板的第二 条形电极与第二液晶相位差板的第二条形电极的电压信号相同。
PCT/CN2013/089306 2013-05-30 2013-12-12 显示装置及显示系统 Ceased WO2014190728A1 (zh)

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