WO2019205976A1 - 显示面板及显示装置 - Google Patents

显示面板及显示装置 Download PDF

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Publication number
WO2019205976A1
WO2019205976A1 PCT/CN2019/082705 CN2019082705W WO2019205976A1 WO 2019205976 A1 WO2019205976 A1 WO 2019205976A1 CN 2019082705 W CN2019082705 W CN 2019082705W WO 2019205976 A1 WO2019205976 A1 WO 2019205976A1
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Prior art keywords
electrode
sub
substrate
display
electric field
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PCT/CN2019/082705
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English (en)
French (fr)
Inventor
徐宏辉
周修和
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京东方科技集团股份有限公司
京东方光科技有限公司
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Priority to US16/641,886 priority Critical patent/US11315510B2/en
Publication of WO2019205976A1 publication Critical patent/WO2019205976A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1391—Bistable or multi-stable 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
    • G02F1/137—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
    • 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
    • G02F1/133345—Insulating layers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • 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
    • G02F1/133553—Reflecting elements
    • 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
    • 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
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3651—Control of matrices with row and column drivers using an active matrix using multistable liquid crystals, e.g. ferroelectric 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134345—Subdivided pixels, e.g. for grey scale or redundancy
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/52—RGB geometrical arrangements
    • 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
    • G09G2320/10—Special adaptations of display systems for operation with variable images
    • G09G2320/103—Detection of image changes, e.g. determination of an index representative of the image change

Definitions

  • the present invention belongs to the field of display technologies, and in particular, to a display panel and a display device.
  • a driving voltage is applied to driving electrodes (such as a pixel electrode and a common electrode) in each sub-pixel to generate an electric field, which can deflect the liquid crystal in a desired manner, thereby causing each sub-pixel to have different degrees. Filtering to achieve display.
  • the present invention provides a display panel having a plurality of sub-pixels, the display panel including a first substrate and a second substrate of the pair of boxes, and a stabilization between the first substrate and the second substrate a liquid crystal; wherein each of the sub-pixels is provided with a first electrode and a second electrode for forming an electric field in the multi-stable liquid crystal, the multi-stable liquid crystal having different optical properties under different electric fields and capable of disappearing after the electric field disappears Maintain the optical properties of the electric field.
  • the first electrode is disposed on a side of the first substrate facing the second substrate; the second electrode is disposed on a side of the second substrate facing the first substrate, and the first electrode and the first pixel in the same sub-pixel
  • the two electrodes are oppositely arranged.
  • the first electrode of each sub-pixel is integrally formed as a common electrode and the second electrode is a separate electrode; or the second electrode of each sub-pixel is integrally formed to form a common electrode.
  • One electrode is a separate electrode.
  • the display panel further includes an insulating layer disposed between the separate electrode and a corresponding substrate on which the electrode is located.
  • the display panel includes a light reflecting layer disposed on a side of the multi-stable liquid crystal that is away from the light incident side of the display panel.
  • the first substrate is closer to the light incident side than the second substrate; the light reflecting layer is disposed between the second substrate and the second electrode.
  • the sub-pixels include different colors, and the sub-pixels are provided with a color filter film corresponding to the corresponding color, and the color filter film is disposed closer to the light than the reflective layer.
  • the color filter film is disposed on a side of the first substrate facing the second substrate; or the color filter film is disposed on a side of the second substrate facing the first substrate.
  • the multi-stable liquid crystals have different transmittances to light under different electric fields.
  • the present invention provides a display device comprising: the above display panel; a driving unit configured to supply a driving voltage to the first electrode and the second electrode to form an electric field; and a control unit, Connected to the driving unit, configured to determine whether to issue a control instruction to the driving unit according to whether the display content of the sub-pixel is changed, the control instruction for controlling the driving unit to stop the first of the sub-pixels that display the content unchanged at least partially An electrode and a second electrode provide a driving voltage.
  • the display device further includes a data providing unit configured to provide display data for describing what screen should be displayed; the control unit is configured to determine the sub-pixel according to the display data Whether the display content has changed.
  • the data providing unit is configured to provide new display data only when there is a change in display content
  • the control unit is configured to determine whether the display content is determined by whether the new display data is received or not Change.
  • control unit is configured to issue a control instruction to the driving unit for controlling the driving unit to stop displaying no change to at least part of the displayed content in response to the display content of the sub-pixel being unchanged.
  • the first electrode and the second electrode of the sub-pixels provide a driving voltage; in response to a change in display content of the sub-pixel, the control unit is configured not to issue the control command to the driving unit, the driving unit still to the first The electrode and the second electrode provide a driving voltage.
  • control unit is configured to issue a control command to the drive unit only when there is no change in the display content of all of the sub-pixels, the control command being used to control the drive unit to stop operating.
  • control unit is configured to control the driving unit to resume operation in response to the display content of the at least partial sub-pixel being changed.
  • the molecules of the multi-stable liquid crystal are regularly arranged under a first electric field provided by the drive unit, thereby allowing light to enter and exit the display panel; in the second provided by the drive unit Under the electric field, wherein the first electric field is different from the second electric field, the molecular arrangement of the multi-stable liquid crystal is irregular, so that the light is absorbed after being reflected inside the display panel and cannot be emitted.
  • the third electric field is between the first electric field and the second electric field
  • the light enters the display panel, and part of the light is emitted from the display panel, and the other part is emitted. Light can't be shot.
  • FIG. 1 is a partial cross-sectional structural view of a display device according to an embodiment of the present invention under a first electric field
  • FIG. 2 is a partial cross-sectional structural view of a display device according to an embodiment of the present invention under a second electric field;
  • FIG. 3 is a partial cross-sectional structural view of a display device under a first electric field according to another embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing a correspondence relationship between sub-pixel luminance and electric field in a display device according to an embodiment of the present invention.
  • a backlight is usually provided, and the backlight consumes the most energy.
  • the best solution is to use no backlight, so there is a reflective display device.
  • the final screen cannot be maintained after the power is turned off, and the electric field must be maintained to maintain the desired deflection state of the liquid crystal. Therefore, in order to realize display, the driving voltage must be constantly supplied to the driving electrodes, resulting in driving work. High consumption. Further, in the conventional liquid crystal display device, a polarizer is required to control the polarization of light, which has a certain luminance loss and affects the utilization of light.
  • the present invention provides a high-intensity reflective display device with low power consumption to at least partially solve the above-described problems in the conventional liquid crystal display device.
  • FIG. 1 is a partial cross-sectional structural view of a display device according to an embodiment of the present invention under a first electric field
  • FIG. 2 is a partial cross-sectional structural view of the display device according to an embodiment of the present invention under a second electric field.
  • FIGS. 1 and 2 schematically show light rays.
  • the embodiment provides a display device, including:
  • a display panel having a plurality of sub-pixels 5, comprising a first substrate 91 and a second substrate 92 of the pair of boxes, and a multi-stable liquid crystal 2 disposed between the first substrate 91 and the second substrate 92; wherein each sub-pixel 5 is provided with a first electrode 11 and a second electrode 12 for forming an electric field in the multi-stable liquid crystal 2, the multi-stable liquid crystal 2 having different optical properties under different electric fields, and capable of maintaining an electric field after the electric field disappears Optical properties;
  • a driving unit configured to supply a driving voltage to the first electrode 11 and the second electrode 12 to form an electric field
  • a control unit connected to the driving unit, configured to determine whether to issue a control instruction to the driving unit according to whether the display content of the sub-pixel 5 has a change, the control instruction is used to control the driving unit to stop the sub-pixel 5 that does not change the content to at least part of the display content.
  • the first electrode 11 and the second electrode 12 in the middle provide a driving voltage.
  • the sub-pixel 5 is a minimum unit for display divided in the x direction.
  • a corresponding first electrode 11 and second electrode 12 are provided in each of the sub-pixels 5.
  • the first substrate 91 and the second substrate 92 may be a glass substrate. In other embodiments of the present invention, the first substrate 91 and the second substrate 92 may be substrates made of other materials, and may be made of the same or different materials. In an embodiment of the present invention, the first electrode 11 may be made of an ITO (Indium Tin Oxide Layer) material, and the second electrode 12 may be made of a metal material. In other embodiments of the invention, the first electrode 11 and the second electrode 12 may be electrodes made of other materials, and may be made of the same or different materials.
  • ITO Indium Tin Oxide Layer
  • the first electrodes 11 in each of the sub-pixels 5 are integrally formed as a common electrode, and the second electrode 12 is separate and serves as a pixel electrode; or, the second electrode in each sub-pixel 5
  • the 12 electrodes are integrally formed as a common electrode, and the first electrode 11 is separate and serves as a pixel electrode.
  • the display device of the present embodiment has a display panel including two opposite substrates, the multi-stable liquid crystal 2 is filled between the two substrates, and the molecular arrangement of the multi-stable liquid crystal 2 is regularly arranged; and each sub-pixel 5 is provided Two electrodes, which can form an electric field in the multi-stable liquid crystal 2 at the sub-pixel 5, thereby changing the state and optical properties of the multi-stable liquid crystal 2, and in turn causing the sub-pixel 5 to display the desired content.
  • the multi-stable liquid crystal 2 is a known liquid crystal material which has different states under different electric fields and can generate different optical properties (such as transmittance of light, change of polarization direction of light, etc.); After the electric field disappears, the multi-stable liquid crystal 2 maintains the state before the electric field is present, that is, maintains the previous optical properties, as long as no other electric field is applied or a special physical environment such as high temperature (greater than 80 degrees) is given.
  • the display device is further provided with a control unit for detecting whether there is a change in the display content of the sub-pixels 5 in the display panel (ie, whether at least part of the position is displayed as a static picture), and determining whether to issue a control command according to the determination
  • the control command can control the driving unit to stop supplying the driving voltage to the sub-pixel 5 (at least partially) displaying the static picture, thereby reducing the output of the driving unit and reducing the driving power consumption.
  • control unit is configured to issue a control instruction to the driving unit, the control instruction for controlling the driving unit to stop the first electrode and the second electrode in the sub-pixels that display the content unchanged at least partially A driving voltage is provided; if the display content of the sub-pixel is changed, the control unit is configured not to issue the control command to the driving unit, and the driving unit still supplies the driving voltage to the first electrode and the second electrode.
  • the sub-pixel 5 In the sub-pixel 5 in which the reception of the driving voltage is stopped, there is no voltage on the first electrode 11 and the second electrode 12, so the electric field between the two is also lost, but the multi-stable liquid crystal 2 is used in the display panel. Therefore, the state and optical properties of the multi-stable liquid crystal 2 at the sub-pixel 5 do not change at this time. Therefore, the sub-pixel 5 still displays the previous content (ie, the content obtained after the last change), and the display effect is not affected. .
  • the control unit controls the driving unit to stop supplying the driving voltage to the corresponding sub-pixel 5 (or to make the driving unit as a whole sleep) when the display content is unchanged, thereby reducing the output of the driving unit and reducing the driving power consumption;
  • the sub-pixel 5 can maintain the previously displayed content without an electric field, and the above manner does not affect the display effect.
  • the manner in which the control unit knows whether the display content of the sub-pixel 5 has changed is various, for example, it can display data from each frame of the data providing unit (eg, a video card) as shown in FIG. 1. (that is, data for describing what screen should be displayed) to analyze whether or not a part of the position pictures in the adjacent frame are the same; or the data providing unit can provide new display data only when the display content changes, Therefore, the control unit can determine whether the display content has changed by receiving new display data.
  • the data providing unit eg, a video card
  • the multi-stable liquid crystal 2 may have two different states under only two different electric fields and have two corresponding optical properties (such as light transmission and opacity), so that the sub-pixel 5 Only two (such as black and white) displays can be implemented.
  • the multi-stable liquid crystal 2 may also have a plurality of different states under a plurality of different electric fields and have a plurality of corresponding optical properties (such as different degrees of light transmission), so that the sub-pixels 5 can realize a plurality of different Grayscale display (such as 16 grayscale).
  • the relationship between the actual brightness of the sub-pixel 5 and the electric field (electric field strength) can be as shown in FIG. 4, and FIG. 4 is a correspondence relationship between the brightness of the sub-pixel and the electric field in the display device according to the embodiment of the present invention.
  • schematic diagram When the electric field intensity between the first electrode 11 and the second electrode 12 is raised from 0 to M, the brightness of the sub-pixel 5 also rises from A to B, and when the electric field strength drops to 0 (ie, no longer the first electrode) When 11 and the second electrode 12 supply a driving voltage, the luminance of the sub-pixel 5 is slightly lowered to C. However, since the difference in brightness between B and C is small and is in the inevitable error range, the human eye does not perceive it, so it can be considered that the state and optical properties of the multi-stable liquid crystal 2 do not change after the electric field disappears.
  • control unit and the driving unit may be independent integrated circuits, chips, processors, etc., or may be integrated in one integrated circuit, chip, and processor.
  • the driving unit can provide a driving voltage for the electrodes in each sub-pixel 5 through separate leads (only the driving unit and the first electrode 11 and one are schematically shown in FIGS. 1 and 2).
  • the second electrode 12 of the pixel 5 is connected).
  • the driving unit may also provide a driving voltage for the electrodes in each sub-pixel 5 in a scanning manner by a structure of "gate line + data line".
  • the first electrode 11 is disposed on a side of the first substrate 91 facing the second substrate 92; the second electrode 12 is disposed on a side of the second substrate 92 facing the first substrate 91 and the first electrode 11 Relative settings.
  • the two electrodes can be respectively disposed on the inner side of the two substrates to form an electric field in the multi-stable liquid crystal 2 most effectively.
  • the sub-pixels 5 are divided into different colors, and the sub-pixels 5 are provided with color filter films corresponding to their colors.
  • each of the sub-pixels 5 of the display panel may be respectively provided with a color filter film of a corresponding color (such as a red filter film R, a green filter film G, and a blue filter film B).
  • the light emitted from the pixel 5 is filtered into a corresponding color to realize color display. If each sub-pixel 5 can also realize display of different gray scales, the final display device can realize full color display.
  • a plurality of adjacent sub-pixels 5 of different colors may constitute one pixel, and the pixel serves as a minimum visible point in the display panel.
  • control unit is operative to issue control commands to the drive unit only when there is no change in the display content of all of the sub-pixels 5, the control commands being used to control the drive unit to stop operating.
  • control unit issues a control command only when the display content of the entire display panel is a static picture to control the overall stop operation of the drive unit (ie, sleep); and if only the display panel is If some of the pictures are static (that is, only part of the sub-pixels 5 display no change in content), no control command is issued, so the drive unit will still supply the driving voltage to the sub-pixels 5 whose display contents are changed and unchanged.
  • the above method can significantly reduce the driving power consumption and reduce the difficulty of control.
  • the control unit should control the driving unit to restart the operation (ie, wake up). Therefore, at this time, the drive unit is actually in the "half-sleep" state, and the work can be restarted at any time instead of the "completely closed” state when the display device is completely turned off.
  • control unit issues a control command to control the driving unit to stop supplying the driving voltage to the sub-pixel 5 whose display content is unchanged, which is also possible (of course At this time, if the display contents of all the sub-pixels 5 are unchanged, the driving unit also stops supplying the driving voltage to all the sub-pixels 5). This way you can minimize drive power consumption.
  • the first electrode 11 is disposed on a side of the first substrate 91 facing the second substrate 92; the second electrode 12 is disposed on the second substrate 92 toward the first substrate.
  • a first electrode 11 of the same sub-pixel 5 is disposed opposite to the second electrode 12; wherein the first electrode 11 of each sub-pixel 5 is integrally formed as a common electrode, or in each sub-pixel 5
  • the second electrodes 12 are connected together to form a common electrode.
  • the electrode may be a common electrode, that is, the first electrode 11 of the plurality of sub-pixels 5 may be integrated and loaded with the same driving voltage, which simplifies the preparation process and makes The circuit powered by one electrode 11 has a simple structure.
  • the display panel is a reflective display panel having a light incident side and a light exiting side (not shown), and both are the same side (ie, light is incident from one side and from the same side) The side is emitted, and the light reflecting layer 3 is provided at a position farther from the light incident side than the multi-stable liquid crystal 2.
  • the display panel is reflective, that is, as shown in FIG. 1, light may pass through the multi-stable liquid crystal 2 after being incident from the light incident side of the display panel and on the reflective layer 3. Reflection occurs on the upper portion, and then passes through the multi-stable liquid crystal 2 again and is emitted from the light incident side to realize display.
  • the advantage of the reflective display panel is that it does not need to use a backlight to provide light, so there is no power consumption of the backlight, which can further reduce power consumption.
  • the first substrate 91 is closer to the light incident side than the second substrate 92; the first electrode 11 is disposed on the side of the first substrate 91 facing the second substrate 92.
  • the second electrode 12 is disposed on the side of the second substrate 92 facing the first substrate 91, and the first electrode 11 and the second electrode 12 in the same sub-pixel 5 are oppositely disposed; the reflective layer 3 is disposed on the second substrate 92 and the second Between the electrodes 12.
  • the light reflecting layer 3 is disposed on the substrate (the second substrate 92) far from the light incident side, and The two electrodes 12 are further away from the multi-stable liquid crystal 2 to avoid an influence on the electric field and to make the electrode most effective to form an electric field in the multi-stable liquid crystal 2.
  • the light reflecting layer 3 is made of a conductive material such as metal
  • at least one insulating layer 8 should be disposed between the second electrode 12 and the second electrode 12, as shown in FIG. 1 and FIG. The electrode 12 is turned on.
  • the second electrode 12 itself is composed of a reflective material, the second electrode 12 can also serve as the light-reflecting layer 3 at the same time, that is, there is no separate light-reflecting layer in the display panel. And since the second substrate 92 is insulated, the insulating layer 8 can be omitted at the same time.
  • the first electrode 11 on the first substrate 91 is a common electrode as an example, whereby the common electrode is closer to the light incident side than the pixel electrode (second electrode 12). .
  • the second electrode 12 is in the form of a common electrode such that the common electrode is farther from the light incident side than the pixel electrode.
  • the sub-pixels 5 are divided into different colors, and the sub-pixels 5 are provided with color filter films (R, G, B) corresponding to the colors thereof, and the color filter films are closer to the reflective layer 3 than the reflective layer 3
  • the light filter is disposed on the side of the first substrate 91 facing the second substrate 92; or the color filter film is disposed on the side of the second substrate 92 facing the first substrate 91.
  • the above display device using the reflective display panel and the opposite electrode it may also be provided with a color filter film to realize color display; obviously, the color filter film must be farther from the light exit side than the light reflecting layer 3 at this time. To ensure that the reflected light can pass through the color filter. Since the light incident side and the light exiting side are the same in the embodiment of the present invention, the color filter film is closer to the light incident side than the light reflecting layer 3 to ensure that the reflected light can pass through the color filter film.
  • the color filter film may be disposed on the side of the first electrode 11 facing the second substrate 92 as shown in FIGS. 1 and 2 .
  • FIG. 3 is a partial cross-sectional structural view of a display device according to another embodiment of the present invention under a first electric field. 3 differs from the embodiment shown in FIG. 1 in that, in FIG. 3, a color filter film is disposed on the side of the second electrode 12 facing the first substrate 91, and light is not shown therein.
  • a color filter film is disposed on the side of the second electrode 12 facing the first substrate 91, and light is not shown therein.
  • the same reference numerals are given to the same elements, and the repeated description is omitted.
  • the color filter film is located between the substrate and the electrode (the first substrate and the first electrode or the second substrate and the second electrode), or on the side of the first substrate near the light incident side It is also feasible.
  • the multi-stable liquid crystal 2 has a different transmittance to light under different electric fields.
  • the multi-stable liquid crystals 2 may have different degrees of transparency under different electric fields, so that the sub-pixels 5 have different brightnesses.
  • the molecules of the multi-stable liquid crystal 2 are regularly arranged, so that the multi-stable liquid crystal 2 is substantially transparent as a whole, allowing light to pass through (including reflection through the reflective layer 3).
  • the sub-pixel 5 has the highest brightness. That is, the display device is in a bright state.
  • the molecular arrangement of the multi-stable liquid crystal 2 is irregular, and the incident light can be randomly scattered. Since a large amount of internal reflection is absorbed and cannot be emitted, the multi-stable liquid crystal 2 is opaque as a whole, and the sub-pixel 5 has the smallest brightness. That is, the display device is in a dark state. Note that, for the sake of simplicity, the light rays in FIGS. 1 and 2 are only states schematically showing incidence and reflection of light.
  • the third electric field is between the first electric field and the second electric field, the light enters the display panel, and part of the light is emitted from the display panel, and the other part of the light cannot be emitted.
  • the above multi-stable liquid crystal 2 having different transmittances is not limited to use in the above reflective display panel, and it can also be used in a transmissive display panel.
  • a polarizer is required to control the polarization of light, but the light is reduced by at least 50% after passing through the polarizer, resulting in a decrease in luminance.
  • the advantage of using the above multi-stable liquid crystal 2 is that the polarizer is not required to control the polarization of the light, and the light emitted from the sub-pixel 5 does not have to be filtered by the polarizer, so there is no inevitable brightness loss, and the light utilization rate can be improved.
  • the structure of the display panel can be simplified (that is, it is not necessary to set a polarizer in the display panel).
  • the display device is any one of an electronic calendar, an electronic watch, an electronic gas meter, an electronic electricity meter, and an electronic water meter.
  • the display device of the present embodiment mainly obtains an energy-saving effect when the display content is unchanged; compared with a computer display or the like, the display content of each of the above devices changes relatively little (for example, the display content of the electronic calendar may change every day)
  • This embodiment is particularly suitable for use with the present embodiment so that the display device can maintain the final picture even after power is turned off.

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Abstract

一种显示面板和显示装置，属于液晶显示技术领域。显示面板，其具有多个子像素(5)，且包括对盒的第一基板(91)和第二基板(92)，以及设于第一基板(91)与第二基板(92)间的多稳态液晶(2)；其中，每个子像素(5)中设有用于在多稳态液晶(2)中形成电场的第一电极(11)和第二电极(12)，多稳态液晶(2)在不同电场下具有不同光学性质，且能在电场消失后保持电场存在时的状态。显示装置，其包括：显示面板；驱动单元，被配置成向第一电极(11)和第二电极(12)提供驱动电压以形成电场；控制单元，其连接到驱动单元，被配置成根据子像素(5)的显示内容是否有变化决定是否向驱动单元发出控制指令，控制指令用于控制驱动单元停止向至少部分显示内容无变化的子像素(5)中的第一电极(11)和第二电极(12)提供驱动电压。

Description

显示面板及显示装置
相关申请的交叉引用
本申请要求于2018年4月26日提交的中国专利申请No.201810385416.8的优先权，所公开的内容以引用的方式合并于此。
技术领域
本发明属于显示技术领域，具体涉及一种显示面板及显示装置。
背景技术
相关技术的液晶显示装置中，给各子像素中的驱动电极(如像素电极和公共电极)施加驱动电压而产生电场，该电场可使液晶按所需方式偏转，进而使各子像素产生不同程度的滤光，实现显示。
发明内容
在一个方面中，本发明提供一种显示面板，其具有多个子像素，所述显示面板包括对盒的第一基板和第二基板，以及设于第一基板与第二基板之间的多稳态液晶；其中，每个子像素中设有用于在多稳态液晶中形成电场的第一电极和第二电极，所述多稳态液晶在不同电场下具有不同光学性质，且能在电场消失后保持电场存在时的光学性质。
在本发明的一个实施例中，第一电极设于第一基板朝向第二基板一侧；第二电极设于第二基板朝向第一基板一侧，且同一子像素中的第一电极与第二电极相对设置。
在本发明的一个实施例中，各子像素中的第一电极连为一体形成公共电极而第二电极为单独的电极；或者，各子像素中的第二电极连为一体形成公共电极而第一电极为单独的电极。
在本发明的一个实施例中，显示面板还包括绝缘层，其设置在所述单独的电极与该电极所处在的相应的基板之间。
在本发明的一个实施例中，显示面板包括反光层，其设置在比所述多稳态液晶的远离所述显示面板的入光侧的一侧。
在本发明的一个实施例中，所述第一基板比第二基板更靠近入光侧；所述反光层设于第二基板与第二电极之间。
在本发明的一个实施例中，所述子像素包括不同颜色，所述子像素中设有与相应颜色对应的彩色滤光膜，所述彩色滤光膜被设置为比反光层更靠近入光侧；其中，所述彩色滤光膜设于第一基板朝向第二基板一侧；或者，所述彩色滤光膜设于第二基板朝向第一基板一侧。
在本发明的一个实施例中，在不同电场下，所述多稳态液晶具有对光的不同的透过率。
在一个方面中，本发明提供一种显示装置，其包括：上述的显示面板；驱动单元，被配置成向所述第一电极和所述第二电极提供驱动电压以形成电场；和控制单元，其连接到驱动单元，被配置成根据子像素的显示内容是否有变化决定是否向驱动单元发出控制指令，所述控制指令用于控制驱动单元停止向至少部分显示内容无变化的子像素中的第一电极和第二电极提供驱动电压。
在本发明的一个实施例中，显示装置还包括数据提供单元，其被配置成提供用于描述应显示什么画面的显示数据；所述控制单元被配置成根据所述显示数据，确定子像素的显示内容是否有变化。
在本发明的一个实施例中，所述数据提供单元被配置成仅在显示内容有变化时才提供新的显示数据，控制单元被配置成通过是否接收到所述新的显示数据确定显示内容是否有变化。
在本发明的一个实施例中，响应于子像素的显示内容无变化，所述控制单元被配置成向驱动单元发出控制指令，所述控制指令用于控制驱动单元停止向至少部分显示内容无变化的子像素中的第一电极和第二电极提供驱动电压；响应于子像素的显示内容有 变化，所述控制单元被配置成不向驱动单元发出该控制指令，驱动单元仍向所述第一电极和所述第二电极提供驱动电压。
在本发明的一个实施例中，所述控制单元被配置成仅在所有子像素的显示内容均无变化时向驱动单元发出控制指令，所述控制指令用于控制驱动单元停止工作。
在本发明的一个实施例中，所述驱动单元整体停止工作后，响应于存在至少部分子像素的显示内容发生变化，控制单元被配置成控制驱动单元重新开始工作。
在本发明的一个实施例中，在由驱动单元提供的第一电场下，多稳态液晶的分子规则排布，从而允许光进入显示面板并从显示面板射出；在由驱动单元提供的第二电场下，其中，第一电场与第二电场不同，多稳态液晶的分子排布不规则，使得光在显示面板内部反射后被吸收，无法射出。
在本发明的一个实施例中，在由驱动单元提供的第三电场下，第三电场在第一电场与第二电场之间，光进入显示面板，且部分光从显示面板射出，而另一部分光无法射出。
附图说明
图1为本发明的实施例的显示装置在第一电场下的局部剖面结构示意图；
图2为本发明的实施例的显示装置在第二电场下的局部剖面结构示意图；
图3为本发明的另一实施例的显示装置在第一电场下的局部剖面结构示意图；和
图4为本发明的实施例的显示装置中子像素亮度与电场的对应关系示意图。
具体实施方式
为使本领域技术人员更好地理解本发明的技术方案，下面结合附图和具体实施方式对本发明作进一步详细描述。
相关技术的液晶显示装置中，通常设置有背光源，而背光源的能耗最大。最好的方案就是不用背光源，所以就有了反射式显示装置。
并且在现有液晶显示装置中，断电后无法维持最终画面，必须保持电场才能使液晶维持所需的偏转状态，故若要实现显示，则必须不断向驱动电极提供驱动电压，导致其驱动功耗高。另外，在现有液晶显示装置中，需要偏光片来控制光的偏振性，这存在必然的亮度损失，影响光的利用率。
本发明提供一种功耗低的高亮度的反射式显示装置，以至少部分解决现有的液晶显示装置中存在的上述问题。
图1为本发明的实施例的显示装置在第一电场下的局部剖面结构示意图；图2为本发明的实施例的显示装置在第二电场下的局部剖面结构示意图。其中，图1和图2示意性的示出了光线。如图1和图2所示，本实施例提供一种显示装置，其包括：
具有多个子像素5的显示面板，其包括对盒的第一基板91和第二基板92，以及设于第一基板91与第二基板92之间的多稳态液晶2；其中，每个子像素5中设有用于在多稳态液晶2中形成电场的第一电极11和第二电极12，多稳态液晶2在不同电场下具有不同光学性质，且能在电场消失后保持电场存在时的光学性质；
驱动单元，被配置成向第一电极11和第二电极12提供驱动电压以形成电场；和
控制单元，其连接到驱动单元，被配置成根据子像素5的显示内容是否有变化决定是否向驱动单元发出控制指令，控制指令用于控制驱动单元停止向至少部分显示内容无变化的子像素5中的第一电极11和第二电极12提供驱动电压。
如图1所示，子像素5是沿x方向划分的用于显示的最小单元。每个子像素5中设有对应的第一电极11和第二电极12。
在本发明的一个实施例中，第一基板91和第二基板92可以为玻璃基板。在本发明的其他实施例中，第一基板91和第二基板92可以为用其他材料制成的基板，且可以由相同或不同材料制成。 在本发明的一个实施例中，第一电极11可以由ITO(氧化铟锡层)材料制成，且第二电极12可以由金属材料制成。在本发明的其他实施例中，第一电极11和第二电极12可以为用其他材料制成的电极，且可以由相同或不同材料制成。在本发明的一个实施例中，各子像素5中的第一电极11连为一体形成公共电极，而第二电极12为单独的且作为像素电极；或者，各子像素5中的第二电极12连为一体形成公共电极，而第一电极11为单独的且作为像素电极。
本实施例的显示装置具有显示面板，其包括两个对置的基板，两基板之间填充有多稳态液晶2，多稳态液晶2的分子规则排布；且每个子像素5中设有两个电极，这两个电极可在该子像素5处的多稳态液晶2中形成电场，从而改变多稳态液晶2的状态和光学性质，并进而使子像素5显示所需内容。其中，多稳态液晶2是已知的液晶材料，其在不同电场下具有不同的状态，并可产生不同的光学性质(如光的透过率、对光偏振方向的改变等)；而当电场消失后，只要不给予其它电场或在高温(大于80度)等特殊物理环境，多稳态液晶2仍保持之前电场存在时的状态，也就是保持之前的光学性质。
显示装置中还设置有控制单元，其用于检测显示面板中的子像素5显示内容是否有变化(即是否有至少部分位置显示的是静态画面)，并据此决定是否发出控制指令，若发出控制指令，则可控制驱动单元停止向(至少部分)显示静态画面的子像素5提供驱动电压，从而减少驱动单元的输出，降低驱动功耗。如果子像素的显示内容无变化，则控制单元被配置成向驱动单元发出控制指令，该控制指令用于控制驱动单元停止向至少部分显示内容无变化的子像素中的第一电极和第二电极提供驱动电压；如果子像素的显示内容有变化，则控制单元被配置成不向驱动单元发出该控制指令，驱动单元仍向所述第一电极和所述第二电极提供驱动电压。
在停止接收驱动电压的子像素5中，其第一电极11和第二电极12上均不再有电压，故二者间的电场也消失，但由于显示面板中使用的是多稳态液晶2，故此时该子像素5处的多稳态液晶2 的状态和光学性质并不改变，因此，子像素5仍保持显示此前的内容(即最后一次变化后得到的内容)，显示效果不受影响。
本实施例的显示装置中，控制单元在显示内容无变化时控制驱动单元停止向相应的子像素5提供驱动电压(或使驱动单元整体休眠)，从而减少驱动单元的输出，降低驱动功耗；同时，由于其中采用多稳态液晶2，故子像素5可在无电场的情况下保持此前显示的内容，以上方式并不影响显示效果。
本实施例的显示装置中，控制单元获知子像素5显示内容是否有变化的方式是多样的，例如其可对来自如图1所示的数据提供单元(如，显卡)的各帧的显示数据(即用于描述应显示什么画面的数据)进行分析，判断相邻帧的画面中是否有部分位置画面相同；或者，数据提供单元也可仅在显示内容有变化时才提供新的显示数据，故控制单元可通过是否接收到新的显示数据确定显示内容是否有变化。
本实施例的显示装置中，多稳态液晶2可以是在仅两个不同电场下具有两种不同状态，并具有两种对应的光学性质(如透光和不透光)，从而子像素5只可实现两种(如黑白)显示。替代地，多稳态液晶2也可以是在多个不同电场下具有多个不同的状态，并具有多种对应的光学性质(如不同程度的透光)，从而子像素5可实现多个不同灰阶的显示(如16灰阶)。
在本发明的一个实施例中，子像素5的实际亮度与电场(电场强度)关系曲线可如图4所示，图4为本发明的实施例的显示装置中子像素亮度与电场的对应关系示意图。当第一电极11和第二电极12之间的电场强度由0升到M时，子像素5的亮度也由A升至B，而当电场强度降为0时(即不再为第一电极11和第二电极12提供驱动电压时)，子像素5的亮度会稍微降低至C。但由于B和C的亮度区别很小，处于不可避免的误差范围之内，人眼不会察觉，故仍可认为在电场消失后，多稳态液晶2的状态和光学性质并未发生变化。
在本发明的一个实施例中，控制单元和驱动单元可以是相互 独立的集成电路、芯片、处理器等，也可集成在一个集成电路、芯片、处理器中。
在本发明的一个实施例中，驱动单元可通过单独的引线为各子像素5中的电极提供驱动电压(如图1和2中仅示意性的画出驱动单元与第一电极11和一个子像素5的第二电极12连接)。在本发明的其他实施例中，驱动单元也可通过“栅线+数据线”的结构以扫描方式为各子像素5中的电极提供驱动电压。在本发明的一个实施例中，第一电极11设于第一基板91朝向第二基板92一侧；第二电极12设于第二基板92朝向第一基板91一侧且与第一电极11相对设置。
也就是说，两种电极可分别设于两基板的内侧并对置，从而最有效的在多稳态液晶2中形成电场。
在本发明的一个实施例中，子像素5分为不同颜色，子像素5中设有与其颜色对应的彩色滤光膜。
也就是说，显示面板的各子像素5中可分别设有相应颜色的彩色滤光膜(如红色滤光膜R、绿色滤光膜G、蓝色滤光膜B)，以将从各子像素5射出的光过滤为相应颜色，实现彩色显示。若各子像素5还可实现不同灰度的显示，则最终显示装置可实现全彩显示。
其中，多个相邻的不同颜色的子像素5(如红色子像素、绿红色子像素、蓝色子像素)可组成一个像素，而像素则作为显示面板中一个最小的可见点。
在本发明的一个实施例中，控制单元用于仅在所有子像素5的显示内容均无变化时向驱动单元发出控制指令，控制指令用于控制驱动单元停止工作。
也就是说，在本发明的一个实施例中，控制单元仅在显示面板整体的显示内容全是静态画面时发出控制指令，以控制驱动单元整体停止工作(即休眠)；而如果显示面板中仅有部分画面为静态(即仅部分子像素5显示内容无变化)，则并不发出控制指令， 故驱动单元此时仍会向显示内容变化和不变的子像素5都提供驱动电压。
对驱动单元而言，即使仅向部分子像素提供驱动电压，其也仍处于工作状态，仍有较高的功耗，而当其停止工作并进入休眠状态时，则几乎无功耗，节能效果最明显。因此，以上方式既可较明显的降低驱动功耗，又可降低控制的难度。
当然，应当理解，驱动单元整体停止工作后，若又有至少部分子像素5的显示内容发生变化，则控制单元应控制驱动单元重新开始工作(即唤醒)。因此，此时驱动单元实际处于“半休眠”状态，随时可重新开始工作，而不是显示装置完全关机时的“完全关闭”状态。
当然，应当理解，如果是只要有部分子像素5的显示内容不变，则控制单元就发出控制指令，以控制驱动单元停止向显示内容不变的子像素5提供驱动电压，也是可行的(当然此时若所有子像素5的显示内容均不变，则驱动单元也是停止向所有子像素5提供驱动电压)。这样的方式可最大限度的降低驱动功耗。
在本发明的一个实施例中，如图1和图2所示，第一电极11设于第一基板91朝向第二基板92一侧；第二电极12设于第二基板92朝向第一基板91一侧，且同一子像素5中的第一电极11与第二电极12相对设置；其中，各子像素5中的第一电极11连为一体形成公共电极，或者，各子像素5中的第二电极12连为一体形成公共电极。
如图1和图2所示，在以上仅有显示内容完全无变化时才提供控制指令的显示装置中，若第一电极11和第二电极12采用以上对置的形式被设置，则其中一种电极(以第一电极11为例)可为公共电极，即多个子像素5中的第一电极11可连为一体，并加载相同的驱动电压，这样可简化其制备工艺，并使为第一电极11供电的电路结构简单。
在本发明的一个实施例中，显示面板为反射式显示面板，其 具有入光侧和出光侧(图中未示出)，且二者为同一侧(即，光从一侧入射并从相同侧射出)，且在比多稳态液晶2更远离入光侧的位置设有反光层3。
也就是说，在本发明的一个实施例中，显示面板为反射式，即，如图1所示，光可从显示面板的入光侧射入后经过多稳态液晶2并在反光层3上发生反射，之后再次经过多稳态液晶2并从入光侧射出，实现显示。反射式显示面板的优点在于不用采用背光源为其提供光，故其中也就不存在背光源的功耗，可进一步降低功耗。
在本发明的一个实施例中，如图1和图2所示，第一基板91比第二基板92更靠近入光侧；第一电极11设于第一基板91朝向第二基板92一侧；第二电极12设于第二基板92朝向第一基板91一侧，且同一子像素5中的第一电极11与第二电极12相对设置；反光层3设于第二基板92与第二电极12之间。
也就是说，在本发明的一个实施例中，对于以上采用反射式显示面板和对置电极的显示装置，反光层3设于远离入光侧的基板(第二基板92)上，且比第二电极12更远离多稳态液晶2，以避免对电场产生影响且使电极最有效的在多稳态液晶2中形成电场。
当然，应当理解，若反光层3是由金属等导电材料构成的，则其与第二电极12之间至少应设有一个绝缘层8，如图1和图2所示，以免将各第二电极12导通。
当然，应当理解，如果第二电极12本身就是由反光材料构成的，则第二电极12同时也可作为反光层3，即显示面板中可没有单独的反光层。并且由于第二基板92是绝缘的，且可同时省略绝缘层8。
当然，在如图1和图2中，是以第一基板91上的第一电极11是公共电极为例进行说明的，由此公共电极比像素电极(第二电极12)更靠近入光侧。但应当理解，如果是第二电极12采用公共电极的形式，从而公共电极比像素电极更远离入光侧，也是可行的。
在本发明的一个实施例中，子像素5分为不同颜色，子像素5中设有与其颜色对应的彩色滤光膜(R、G、B)，彩色滤光膜比反光层3更靠近入光侧；彩色滤光膜设于第一基板91朝向第二基板92一侧；或者，彩色滤光膜设于第二基板92朝向第一基板91一侧。
也就是说，对于以上采用反射式显示面板和对置电极的显示装置，其也可设有彩色滤光膜以实现彩色显示；显然，此时彩色滤光膜必须比反光层3更远离出光侧，以保证反射光可经过彩色滤光膜。由于在本发明的实施例中，入光侧和出光侧相同，因此，彩色滤光膜比反光层3更靠近入光侧，以保证反射光可经过彩色滤光膜。
具体的，彩色滤光膜可如图1、图2所示设于第一电极11朝向第二基板92一侧。
图3为本发明的另一实施例的显示装置在第一电场下的局部剖面结构示意图。图3与图1所示的实施例的区别在于，在图3中，色滤光膜设于第二电极12朝向第一基板91一侧，并且其中未示出光线。为了简单起见，相同附图标记表示相同元件，并省略重复描述。
在本发明的其他实施例中，如果彩色滤光膜位于基板与电极(第一基板与第一电极或第二基板与第二电极)之间，或位于第一基板靠近入光侧的一侧，也是可行的。
在本发明的一个实施例中，在不同电场下，多稳态液晶2具有对光的不同的透过率。
也就是说，在不同电场下，多稳态液晶2可具有不同的透明程度，从而使子像素5具有不同亮度。例如，如图1所示，在第一电场下，多稳态液晶2的分子规则排布，从而多稳态液晶2整体上基本透明，允许光通过(包括经由反射层3反射)，此时，子像素5亮度最大。即，显示装置处于亮态。
而如图2所示，在第二电场下，其中，第一电场与第二电场不同，多稳态液晶2的分子排布不规则，可对射入的光进行无规 则的散射，光在其内部大量反射后被吸收，无法射出，故此时多稳态液晶2整体上不透明，子像素5亮度最小。即，显示装置处于暗态。注意，为了简单起见，图1和图2中的光线仅是示意性示出光线入射与反射的状态。
在由驱动单元提供的第三电场下，第三电场在第一电场与第二电场之间，光进入显示面板，且部分光从显示面板射出，而另一部分光无法射出。
当然，应当理解，以上具有不同透过率的多稳态液晶2并不限于用在以上的反射式显示面板中，其也可用于透射式显示面板中。
在现有液晶显示装置中，需要偏光片来控制光的偏振性，但经过偏光片后光线至少减少50％以上，造成亮度下降。采用以上多稳态液晶2的优点在于，不需要偏光片来控制光的偏振性，从子像素5射出的光不必经过偏光片的过滤，故不存在必然的亮度损失，可提高光的利用率，同时可简化显示面板的结构(即显示面板中不必设置偏光片)。
在本发明的一个实施例中，显示装置为电子日历、电子表、电子煤气表、电子电表、电子水表中任意一种。
如前，本实施例的显示装置主要在显示内容不变时获得节能效果；而与电脑显示器等相比，以上的各器件的显示内容变化相对较少(如电子日历的显示内容可能每天才改变一次)，故特别适于采用本实施例，以使得显示装置在断电后仍能维持最终画面。
可以理解的是，以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式，然而本发明并不局限于此。对于本领域内的普通技术人员而言，在不脱离本发明的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本发明的保护范围。

Claims (16)

  1. 一种显示面板，其具有多个子像素，所述显示面板包括对盒的第一基板和第二基板，以及设于第一基板与第二基板之间的多稳态液晶；其中，每个子像素中设有用于在多稳态液晶中形成电场的第一电极和第二电极，所述多稳态液晶在不同电场下具有不同光学性质，且能在电场消失后保持电场存在时的光学性质。
  2. 根据权利要求1所述的显示面板，其中，
    所述第一电极设于第一基板朝向第二基板一侧；
    所述第二电极设于第二基板朝向第一基板一侧，且同一子像素中的第一电极与第二电极相对设置。
  3. 根据权利要求2所述的显示面板，其中，
    各子像素中的第一电极连为一体形成公共电极而第二电极为单独的电极；或者，各子像素中的第二电极连为一体形成公共电极而第一电极为单独的电极。
  4. 根据权利要求3所述的显示面板，还包括绝缘层，其设置在所述单独的电极与该电极所处在的相应的基板之间。
  5. 根据权利要求2所述的显示面板，包括反光层，其设置在比所述多稳态液晶的远离所述显示面板的入光侧的一侧。
  6. 根据权利要求5所述的显示面板，其中，
    所述第一基板比第二基板更靠近入光侧；
    所述反光层设于第二基板与第二电极之间。
  7. 根据权利要求6所述的显示面板，其中，
    所述子像素包括不同颜色，所述子像素中设有与相应颜色对 应的彩色滤光膜，所述彩色滤光膜被设置为比反光层更靠近入光侧；
    其中，
    所述彩色滤光膜设于第一基板朝向第二基板一侧；或者，所述彩色滤光膜设于第二基板朝向第一基板一侧。
  8. 根据权利要求1至7中任意一项所述的显示面板，其中，在不同电场下，所述多稳态液晶具有对光的不同的透过率。
  9. 一种显示装置，其包括：
    如权利要求1至8中任意一项所述的显示面板；
    驱动单元，被配置成向所述第一电极和所述第二电极提供驱动电压以形成电场；和
    控制单元，其连接到驱动单元，被配置成根据子像素的显示内容是否有变化决定是否向驱动单元发出控制指令，所述控制指令用于控制驱动单元停止向至少部分显示内容无变化的子像素中的第一电极和第二电极提供驱动电压。
  10. 根据权利要求9所述的显示装置，还包括数据提供单元，其被配置成提供用于描述应显示什么画面的显示数据；所述控制单元被配置成根据所述显示数据，确定子像素的显示内容是否有变化。
  11. 根据权利要求10所述的显示装置，其中，所述数据提供单元被配置成仅在显示内容有变化时才提供新的显示数据，控制单元被配置成通过是否接收到所述新的显示数据确定显示内容是否有变化。
  12. 根据权利要求11所述的显示装置，其中，响应于子像素的显示内容无变化，所述控制单元被配置成向驱动单元发出控制 指令，所述控制指令用于控制驱动单元停止向至少部分显示内容无变化的子像素中的第一电极和第二电极提供驱动电压；响应于子像素的显示内容有变化，所述控制单元被配置成不向驱动单元发出该控制指令，驱动单元仍向所述第一电极和所述第二电极提供驱动电压。
  13. 根据权利要求12所述的显示装置，其中，所述控制单元被配置成仅在所有子像素的显示内容均无变化时向驱动单元发出控制指令，所述控制指令用于控制驱动单元停止工作。
  14. 根据权利要求13所述的显示装置，其中，所述驱动单元整体停止工作后，响应于存在至少部分子像素的显示内容发生变化，控制单元被配置成控制驱动单元重新开始工作。
  15. 根据权利要求9所述的显示装置，其中，
    在由驱动单元提供的第一电场下，多稳态液晶的分子规则排布，从而允许光进入显示面板并从显示面板射出，
    在由驱动单元提供的第二电场下，其中，第一电场与第二电场不同，多稳态液晶的分子排布不规则，使得光在显示面板内部反射后被吸收，无法射出。
  16. 根据权利要求15所述的显示装置，其中，在由驱动单元提供的第三电场下，第三电场在第一电场与第二电场之间，光进入显示面板，且部分光从显示面板射出，而另一部分光无法射出。
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