CN116643421A - Display device with switchable viewing angle and driving method thereof - Google Patents

Display device with switchable viewing angle and driving method thereof Download PDF

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Publication number
CN116643421A
CN116643421A CN202310497996.0A CN202310497996A CN116643421A CN 116643421 A CN116643421 A CN 116643421A CN 202310497996 A CN202310497996 A CN 202310497996A CN 116643421 A CN116643421 A CN 116643421A
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CN
China
Prior art keywords
liquid crystal
viewing angle
substrate
display
electrode
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Pending
Application number
CN202310497996.0A
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Chinese (zh)
Inventor
钟德镇
廖家德
刘涛
姜丽梅
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InfoVision Optoelectronics Kunshan Co Ltd
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InfoVision Optoelectronics Kunshan Co Ltd
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Priority to CN202310497996.0A priority Critical patent/CN116643421A/en
Publication of CN116643421A publication Critical patent/CN116643421A/en
Pending legal-status Critical Current

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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
    • G02F1/1323—Arrangements for providing a switchable viewing angle
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated 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
    • G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
    • G02F1/13345—Network or three-dimensional gels
    • 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
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—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
    • G02F1/13476—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 at least one liquid crystal cell or layer assumes a scattering state
    • 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
    • G02F1/13706—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 the liquid crystal having positive dielectric anisotropy
    • 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
    • G02F1/13712—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 the liquid crystal having negative dielectric anisotropy
    • 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
    • G02F1/13718—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 a change of the texture state of a cholesteric liquid crystal
    • 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

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention discloses a display device with switchable visual angles and a driving method thereof, wherein the display device comprises a backlight module and a display panel, and the display panel can be switched between a wide visual angle and a narrow visual angle; the backlight module comprises a backlight source and a first liquid crystal box, wherein the first liquid crystal box is used for controlling the light scattering range of the backlight module and comprises a first substrate, a second substrate and a polymer liquid crystal layer positioned between the first substrate and the second substrate; when the display panel is switched to a wide viewing angle mode during wide viewing angle display, the astigmatism range of the backlight module is adjusted to control the viewing angle range of the wide viewing angle display; when the display panel is switched to the narrow viewing angle mode during the narrow viewing angle display, the astigmatism range of the backlight module is adjusted to control the viewing angle range of the narrow viewing angle display. By arranging the first liquid crystal box in the backlight module, the astigmatism range of the backlight module can be adjusted at will, so that the display device has a larger adjustable visual angle range when displaying in a wide visual angle and displaying in a narrow visual angle.

Description

Display device with switchable viewing angle and driving method thereof
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display device with switchable viewing angles and a driving method thereof.
Background
With the continuous progress of the liquid crystal display technology, the visual angle of the display is widened to more than 160 degrees from about 120 degrees originally, and people want to effectively protect business confidentiality and personal privacy while enjoying the visual experience brought by a large visual angle so as to avoid business loss or embarrassment caused by the leakage of screen information. In addition to the wide viewing angle requirement, there are many occasions where the display device is required to have a function of switching between wide and narrow viewing angles.
At present, a shutter shielding film is attached to a display screen to realize wide and narrow viewing angles, when peep prevention is needed, the viewing angles can be reduced by shielding the screen by using the shutter shielding film, but the shutter shielding film is additionally prepared in the mode, so that great inconvenience is caused to a user, one shutter shielding film can only realize one viewing angle, once the shutter shielding film is attached, the viewing angle is fixed in a narrow viewing angle mode, free switching between the wide viewing angle mode and the narrow viewing angle mode is not realized, and the peep prevention sheet can cause brightness reduction to influence grade.
There are also prior art double box structures for switching between wide and narrow viewing angles using a dimming box and a display panel, wherein the display panel is used for normal picture display and the dimming box is used for controlling the viewing angle switching. The dimming box comprises an upper substrate, a lower substrate and a liquid crystal layer between the upper substrate and the lower substrate, wherein a vertical electric field is applied to liquid crystal molecules by visual angle control electrodes on the upper substrate and the lower substrate, so that the liquid crystal deflects towards the vertical direction, a narrow visual angle mode is realized, and the switching between a wide visual angle and a narrow visual angle can be realized by controlling the voltage on the visual angle control electrodes. However, the ratio of the left and right 45 ° brightness to the center brightness is about 1.1% when the wide viewing angle is used, the side view effect is poor when the wide viewing angle is used, and the adjustable viewing angle ranges of the wide viewing angle and the narrow viewing angle are small.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a display device with switchable viewing angles and a driving method thereof, so as to solve the problem that the adjustable viewing angle range of a wide viewing angle and a narrow viewing angle in the prior art is smaller.
The aim of the invention is achieved by the following technical scheme:
the invention provides a display device with a switchable viewing angle, which comprises a backlight module and a display panel arranged on the light emitting side of the backlight module, wherein the display panel can be switched between a wide viewing angle and a narrow viewing angle;
the backlight module comprises a backlight source and a first liquid crystal box which is laminated on the light emitting side of the backlight source, wherein the first liquid crystal box is used for controlling the light scattering range of the backlight module and comprises a first substrate, a second substrate which is arranged opposite to the first substrate and a polymer liquid crystal layer which is arranged between the first substrate and the second substrate, a first electrode is arranged on the first substrate, and a second electrode which is matched with the first electrode is arranged on the second substrate;
when the display panel is in wide-view angle display, the display panel is switched to a wide-view angle mode, and the astigmatism range of the backlight module is adjusted to control the view angle range of the wide-view angle display;
When the display panel is in the narrow viewing angle display, the display panel is switched to the narrow viewing angle mode, and the astigmatism range of the backlight module is adjusted to control the viewing angle range of the narrow viewing angle display.
Further, the polymer liquid crystal layer is polymer dispersed liquid crystal, polymer network liquid crystal or polymer stabilized cholesteric liquid crystal.
Further, the backlight module further comprises a diffusion sheet, wherein the diffusion sheet is laminated between the backlight source and the first liquid crystal box; or the diffusion sheet is laminated on one side of the first liquid crystal box away from the backlight source.
Further, the display panel comprises a dimming box and a display liquid crystal box which are mutually overlapped, wherein the dimming box is used for controlling the display panel to switch between a wide viewing angle and a narrow viewing angle;
the dimming box comprises a third substrate, a fourth substrate and a first liquid crystal layer, wherein the fourth substrate is arranged opposite to the third substrate, the first liquid crystal layer is positioned between the third substrate and the fourth substrate, a viewing angle auxiliary electrode is arranged on the third substrate, and a viewing angle control electrode matched with the viewing angle auxiliary electrode is arranged on the fourth substrate;
the display liquid crystal box comprises a color film substrate, an array substrate arranged opposite to the color film substrate and a second liquid crystal layer arranged between the color film substrate and the array substrate.
Further, a first prism structure is arranged on the third substrate, and the first prism structure has an astigmatism function; and/or a second prism structure is arranged on the fourth substrate, and the second prism structure has an astigmatism function.
Further, the first liquid crystal layer adopts positive liquid crystal molecules, the positive liquid crystal molecules are aligned parallel to the third substrate and the fourth substrate, and the alignment direction of one side of the first liquid crystal layer close to the third substrate and the alignment direction of one side of the first liquid crystal layer close to the fourth substrate are mutually parallel; or, the first liquid crystal layer adopts negative liquid crystal molecules, and the negative liquid crystal molecules are inclined to the third substrate and the fourth substrate for alignment.
Further, the first liquid crystal layer comprises liquid crystal molecules and dye molecules which are mixed with each other, the liquid crystal molecules are positive liquid crystal molecules, the liquid crystal molecules and the dye molecules are aligned parallel to the third substrate and the fourth substrate, and the alignment direction of one side of the first liquid crystal layer close to the third substrate is parallel to the alignment direction of one side of the first liquid crystal layer close to the fourth substrate; or, the first liquid crystal layer includes liquid crystal molecules and dye molecules mixed with each other, the liquid crystal molecules are negative liquid crystal molecules, and the liquid crystal molecules and the dye molecules are aligned obliquely to the third substrate and the fourth substrate.
Further, a common electrode and a pixel electrode are arranged on the array substrate, and the common electrode and the pixel electrode are positioned on different layers and are insulated; or, the array substrate is provided with a pixel electrode, and the color film substrate is provided with a common electrode matched with the pixel electrode.
The present application also provides a driving method of a display device for driving the display device as described above, the driving method comprising:
when the display panel is switched to a wide viewing angle mode, the light scattering range of the backlight module is adjusted to control the viewing angle range of the wide viewing angle display;
when the display panel is in the narrow viewing angle display, the display panel is switched to a narrow viewing angle mode, and the astigmatism range of the backlight module is adjusted to control the viewing angle range of the narrow viewing angle display;
and when the display device displays in a wide view angle and a narrow view angle, the luminous brightness of the backlight module is adjusted according to the astigmatism range of the backlight module, so that the central brightness of the display device is maintained within a preset range.
Further, the driving method further includes: monitoring the ambient light level;
when the ambient light brightness is greater than or equal to the preset brightness, the display device is controlled to be switched to display with a wide viewing angle; and when the ambient light brightness is smaller than the preset brightness, controlling the display device to switch to display with a narrow viewing angle.
The application has the beneficial effects that: the backlight module is provided with a first liquid crystal box, the first liquid crystal box comprises a first substrate, a second substrate which is arranged opposite to the first substrate, and a polymer liquid crystal layer which is arranged between the first substrate and the second substrate, a first electrode is arranged on the first substrate, a second electrode which is matched with the first electrode is arranged on the second substrate, and the haze of the polymer liquid crystal layer is adjusted by controlling the pressure difference between the first electrode and the second electrode, so that the astigmatism range of the backlight module can be adjusted at will, and a display panel which can be switched between a wide viewing angle and a narrow viewing angle is matched, so that the display device can be switched between wide viewing angle display and narrow viewing angle display, and has a larger adjustable viewing angle range when the wide viewing angle display and the narrow viewing angle display are carried out; in addition, the scheme of the application has no influence on the box thickness of the display panel, and the box thickness of the display panel is not required to be additionally increased.
Drawings
Fig. 1 is a schematic structural diagram of a display device in an initial state according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of a polymer dispersed liquid crystal according to the first embodiment of the present application;
FIG. 3 is a schematic diagram of a polymer network liquid crystal according to the first embodiment of the present application;
FIG. 4 is a schematic diagram of the first embodiment of the present invention in which a polymer is used to stabilize cholesteric liquid crystals;
FIG. 5 is a schematic diagram of a prism structure according to a first embodiment of the present invention;
FIG. 6 is a schematic view of a display device with a maximum viewing angle according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a display device with a wide viewing angle in the middle according to the first embodiment of the invention;
FIG. 8 is a schematic diagram of a display device with a minimum wide viewing angle according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a display device with a maximum narrow viewing angle according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a display device with a narrow viewing angle in the middle according to the first embodiment of the invention;
FIG. 11 is a schematic view of a display device with a minimum narrow viewing angle according to an embodiment of the present invention;
FIG. 12 is a schematic diagram showing control signal transmission of a display device according to an embodiment of the invention;
FIG. 13 is a schematic diagram of a display device with a wide viewing angle according to a second embodiment of the present invention;
FIG. 14 is a simulation diagram of the contrast ratio and the viewing angle of dye molecules with different doping ratios at a wide viewing angle in a display device according to a second embodiment of the present invention;
fig. 15 is a schematic structural diagram of a display device with a narrow viewing angle according to a second embodiment of the present invention;
FIG. 16 is a simulation diagram of the contrast ratio and the viewing angle of dye molecules with different doping ratios at a narrow viewing angle in a display device according to a second embodiment of the present invention;
FIG. 17 is a schematic view showing a planar structure of a display device according to the present invention;
FIG. 18 is a schematic diagram showing a second planar structure of the display device according to the present invention;
fig. 19 is a schematic perspective view of a display device according to the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention to achieve the preset purpose, the following detailed description is given of the specific implementation, structure, characteristics and effects of the display device and driving method thereof according to the present invention, which are provided by the present invention, with reference to the accompanying drawings and the preferred embodiments, wherein:
example one
Fig. 1 is a schematic diagram of a display device in an initial state according to a first embodiment of the present invention. As shown in fig. 1, a display device with switchable viewing angles according to an embodiment of the invention includes a backlight module 40 and a display panel disposed on a light emitting side of the backlight module 40. Wherein the display panel is capable of switching between a wide viewing angle and a narrow viewing angle.
The backlight module 40 includes a backlight 41 and a first liquid crystal cell 42 laminated on the light emitting side of the backlight 41, wherein the first liquid crystal cell 42 is used for controlling the light scattering range of the backlight module 40. The backlight 41 may be a side-in backlight or a collimated backlight. The first liquid crystal cell 42 includes a first substrate 421, a second substrate 422 disposed opposite to the first substrate 421, and a polymer liquid crystal layer 423 disposed between the first substrate 421 and the second substrate 422. The first substrate 421 is provided with a first electrode 421a, the second substrate 422 is provided with a second electrode 422a cooperating with the first electrode 421a, and the polymer liquid crystal layer 423 is controlled to switch between a fog state and a transparent state by controlling the voltages on the first electrode 421a and the second electrode 422a, i.e. the haze of the polymer liquid crystal layer 423 is controlled. Since the first liquid crystal cell 42 uses the polymer liquid crystal layer 423 with a thickness of about 100um, the first liquid crystal cell 42 may also be referred to as a polymer liquid crystal film for assembly in the backlight module 40.
When displaying at a wide viewing angle, the display panel is switched to a wide viewing angle mode, and the light scattering range of the backlight module 40 is adjusted to control the viewing angle range of the wide viewing angle display; when the display panel is switched to the narrow viewing angle mode during the narrow viewing angle display, the light scattering range of the backlight module 40 is adjusted to control the viewing angle range of the narrow viewing angle display.
FIG. 2 is a schematic diagram of the first embodiment of the present invention using a polymer dispersed liquid crystal. As shown in fig. 2, in the present embodiment, the polymer liquid crystal layer 423 employs polymer dispersed liquid crystal (PDLC, polymer dispersed liquid crystal). As shown in fig. 2a, the optical axis of small droplets of polymer dispersed liquid crystal molecules is in a free orientation, the refractive index of which does not match that of the matrix, and when light passes through the matrix, it is strongly scattered by the liquid crystal droplets to assume an opaque milky or translucent state. As shown in fig. 2b, the application of an electric field adjusts the optical axis orientation of the liquid crystal droplets, and when the refractive indices of the two are matched, a transparent state is assumed. The liquid crystal droplets, upon removal of the electric field, resume the original astigmatic state (haze) and display. That is, in the scattering mode, the pressure difference between the first electrode 421a and the second electrode 422a is smaller than a first preset value, so that the polymer dispersed liquid crystal is in a fog state and has a light scattering effect; in the transmissive mode, the pressure difference between the first electrode 421a and the second electrode 422a is greater than a second predetermined value, so that the polymer dispersed liquid crystal is in a transparent state. Thereby controlling the switching of the polymer dispersed liquid crystal between the haze state and the transparent state by controlling the electric signals applied to the first electrode 421a and the second electrode 422 a. The smaller the pressure difference between the first electrode 421a and the second electrode 422a, the closer the polymer dispersed liquid crystal is to the haze state, whereas the larger the pressure difference between the first electrode 421a and the second electrode 422a, the closer the polymer dispersed liquid crystal is to the transparent state. The polymer dispersed liquid crystal has a light scattering effect in a fog state, and does not change an emitting angle of light in a transparent state, so that the haze of the polymer dispersed liquid crystal can be adjusted by adjusting a pressure difference between the first electrode 421a and the second electrode 422a to control a light scattering range of the backlight module 40.
Fig. 3 is a schematic diagram of a polymer network liquid crystal according to the first embodiment of the present invention. In another embodiment, as shown in fig. 3, the polymer liquid crystal layer 423 may also employ Polymer Network Liquid Crystal (PNLC) that mixes low molecular liquid crystal with prepolymer, and the liquid crystal molecules are contained in the network through polymerization under certain conditions. As shown in fig. 3a, the liquid crystal will be uniformly aligned due to the alignment induction, and the polymer monomer will also have a liquid crystal phase, which is also uniformly aligned under guest host effect. At this time, the polymer network liquid crystal with consistent arrangement is obtained by performing polymerization phase separation, and the polymer network liquid crystal is in a transparent state when no voltage is applied. As shown in fig. 3b, when the electric field is applied, the negative liquid crystals tend to be aligned in parallel, and at this time, the anchoring action of the polymer network to the liquid crystal molecules rotates the structure, and the liquid crystal alignment is disordered and scattered, so that a haze is generated. That is, in the scattering mode, the pressure difference between the first electrode 421a and the second electrode 422a is greater than a third preset value, so that the polymer network liquid crystal is in a fog state and has a light scattering effect; in the transmissive mode, the pressure difference between the first electrode 421a and the second electrode 422a is less than the fourth predetermined value, so that the polymer network liquid crystal is in a transparent state. Thereby controlling the switching of the polymer network liquid crystal between the fog state and the transparent state by controlling the electrical signals applied to the first electrode 421a and the second electrode 422 a. The larger the pressure difference between the first electrode 421a and the second electrode 422a, the closer the polymer network liquid crystal is to the haze state, whereas the smaller the pressure difference between the first electrode 421a and the second electrode 422a, the closer the polymer network liquid crystal is to the transparent state. The polymer network liquid crystal has a light scattering effect in a fog state, and the polymer network liquid crystal does not change the light emitting angle in a transparent state, so that the haze of the polymer network liquid crystal can be adjusted by adjusting the pressure difference between the first electrode 421a and the second electrode 422a so as to control the light scattering range of the backlight module 40.
FIG. 4 is a schematic diagram of the first embodiment of the present invention in which a polymer is used to stabilize cholesteric liquid crystal. In another embodiment, as shown in fig. 4, the polymer liquid crystal layer 423 may also employ polymer stabilized cholesteric liquid crystals (PSCT). As shown in fig. 4a, the cholesteric phase of the polymer stabilized cholesteric liquid crystal is P-state, i.e. transparent state, when the power is removed: as shown in fig. 4b, when power is applied, under the action of voltage, the cholesteric phase changes to FC state, i.e. fog state, and scattering occurs. That is, in the scattering mode, the pressure difference between the first electrode 421a and the second electrode 422a is greater than a fifth preset value, so that the polymer stabilizes the cholesteric liquid crystal to be in a fog state and has an astigmatic effect; in the transmissive mode, the pressure difference between the first electrode 421a and the second electrode 422a is less than a sixth predetermined value, so that the polymer stabilized cholesteric liquid crystal is in a transparent state. Thereby controlling the switching of the polymer stabilized cholesteric liquid crystal between the haze state and the transparent state by controlling the electrical signals applied to the first electrode 421a and the second electrode 422 a. The greater the pressure difference between the first electrode 421a and the second electrode 422a, the closer the polymer stabilized cholesteric liquid crystal is to the haze state, whereas the smaller the pressure difference between the first electrode 421a and the second electrode 422a, the closer the polymer stabilized cholesteric liquid crystal is to the transparent state. The polymer stabilized cholesteric liquid crystal has a light scattering effect in a fog state, and the polymer stabilized cholesteric liquid crystal does not change the light emitting angle in a transparent state, so that the haze of the polymer network liquid crystal can be adjusted by adjusting the pressure difference between the first electrode 421a and the second electrode 422a so as to control the light scattering range of the backlight module 40.
In this embodiment, the backlight module 40 further includes a diffusion sheet 43, where the diffusion sheet 43 is laminated on one side of the first liquid crystal cell 42 away from the backlight 41, and the diffusion sheet 43 can diffuse the light of the backlight 41, so that the light of the backlight 41 is more uniform. Of course, in other embodiments, the diffusion sheet 43 is laminated between the backlight 41 and the first liquid crystal cell 42.
As shown in fig. 1, the display panel includes a dimming box 10 and a display liquid crystal box 20 that are stacked on each other, where the dimming box 10 is used to control the display panel to switch between a wide viewing angle and a narrow viewing angle, and the display liquid crystal box 20 is used to control gray scale of the display of the picture, that is, the display liquid crystal box 20 may be a common display panel, and light intensity of each sub-pixel may be controlled, so as to control gray scale of the display of the picture. The dimming box 10 may be disposed at a side of the display liquid crystal box 20 away from the backlight module 40, or may be disposed at a side of the display liquid crystal box 20 facing the backlight module 40.
The dimming box 10 includes a third substrate 11, a fourth substrate 12 disposed opposite to the third substrate 11, and a first liquid crystal layer 13 between the third substrate 11 and the fourth substrate 12. The third substrate 11 is provided with a viewing angle auxiliary electrode 111, the fourth substrate 12 is provided with a viewing angle control electrode 121 matched with the viewing angle auxiliary electrode 111, and the voltage on the viewing angle auxiliary electrode 111 and the voltage on the viewing angle control electrode 121 are controlled to control the dimming box 10 to switch between a wide viewing angle and a narrow viewing angle.
In this embodiment, the first liquid crystal layer 13 employs positive liquid crystal molecules, that is, liquid crystal molecules having positive dielectric anisotropy. As shown in fig. 1, in the initial state, the positive liquid crystal molecules are aligned parallel to the third and fourth substrates 11 and 12, and the alignment direction of the first liquid crystal layer 13 on the side close to the third substrate 11 and the alignment direction on the side close to the fourth substrate 12 are parallel to each other (forward parallel or reverse parallel), so that the dimming cartridge 10 is in a wide viewing angle state in the initial state. The positive liquid crystal molecules in the first liquid crystal layer 13 may have a small initial pretilt angle between the third substrate 11 and the fourth substrate 12, and the range of the initial pretilt angle may be less than or equal to 5 degrees, that is: 0 DEG.ltoreq.0.ltoreq.5 DEG to reduce the response time of the vertical deflection of the positive liquid crystal molecules, i.e. to reduce the response time of switching between wide viewing angles and narrow viewing angles. Of course, in other embodiments, the first liquid crystal layer 13 may also use negative liquid crystal molecules, that is, liquid crystal molecules having negative dielectric anisotropy. The negative liquid crystal molecules are aligned obliquely to the third and fourth substrates 11 and 12, so that the dimming cell 10 is in a narrow viewing angle state at the initial state.
Further, the third substrate 11 is provided with a first prism structure 112, and the first prism structure 112 has an astigmatism effect; and/or, the fourth substrate 12 is provided with a second prism structure 122, and the second prism structure 122 has an astigmatic effect. In the present embodiment, the third substrate 11 is provided with the first prism structure 112, and the fourth substrate 12 is provided with the second prism structure 122, and both the first prism structure 112 and the second prism structure 122 have a light-diffusing effect on the light source emitted by the backlight module 40, so as to increase the viewing angle range of the wide viewing angle. Of course, in other embodiments, only the first prism structure 112 may be disposed on the third substrate 11; alternatively, only the second prism structure 122 is provided on the fourth substrate 12.
Fig. 5 is a schematic structural diagram of a prism structure in the first embodiment of the present invention, wherein a in fig. 5 is a schematic structural diagram of a first prism structure, and B in fig. 5 is a schematic structural diagram of a second prism structure. As shown in fig. 5, the first prism structure 112 includes a first refractive layer 112a and a second refractive layer 112b that are stacked on each other, and the first refractive layer 112a is located on a side of the second refractive layer 112b away from the first liquid crystal layer 13. The second prism structure 122 includes a third refractive layer 122a and a fourth refractive layer 122b disposed on top of each other, the fourth refractive layer 122b being located on a side of the third refractive layer 122a facing the first liquid crystal layer 13. The first refractive layer 112a and the third refractive layer 122a are provided with a plurality of convex structures, wherein the refractive index of the first refractive layer 112a is smaller than that of the second refractive layer 112b, and the refractive index of the third refractive layer 122a is smaller than that of the fourth refractive layer 122b, so that the first prism structure 112 and the second prism structure 122 have astigmatism effects.
Further, the cross section of the protruding structure is in a semicircular structure, a trapezoid structure or a triangular structure, and the protruding structure is in a columnar structure, namely, the protruding structure is in an inverted semi-cylinder, trapezoid column or triangular prism. Of course, in other embodiments, the prism structure is not limited to be disposed in the dimming box 10, and a prism structure with a light scattering effect may be disposed on the color film substrate 21 and/or the array substrate 22 of the display liquid crystal box 20.
As shown in fig. 1, the display liquid crystal cell 20 includes a color film substrate 21, an array substrate 22 disposed opposite to the color film substrate 21, and a second liquid crystal layer 23 disposed between the color film substrate 21 and the array substrate 22. In this embodiment, positive liquid crystal molecules, that is, liquid crystal molecules with positive dielectric anisotropy, are used in the second liquid crystal layer 23, and as shown in fig. 1, in the initial state, the positive liquid crystal molecules in the second liquid crystal layer 23 are aligned parallel to the color film substrate 21 and the array substrate 22, and the positive liquid crystal molecules near the color film substrate 21 are antiparallel to the alignment direction of the positive liquid crystal molecules near the array substrate 22.
The color film substrate 21 is provided with a color resist layer 212 and a Black Matrix (BM) 211 that separates the color resist layers 212 on a side facing the second liquid crystal layer 23. The color resist layer 212 includes, for example, red (R), green (G), and blue (B) color resist materials, and respectively corresponds to pixel units of red, green, and blue colors. The black matrix 211 is positioned between pixel units of three colors of red, green and blue, so that adjacent pixel units are spaced apart from each other by the black matrix 211.
The array substrate 22 is defined by a plurality of scan lines and a plurality of data lines on a side facing the second liquid crystal layer 23 in an insulating and crossing manner to form a plurality of pixel units, the black matrix 211 corresponds to the scan lines and the data lines up and down, a pixel electrode 222 and a thin film transistor are arranged in each pixel unit, and the pixel electrode 222 is electrically connected with the data line adjacent to the thin film transistor through the thin film transistor. The thin film transistor includes a gate electrode, an active layer, a drain electrode, and a source electrode, wherein the gate electrode and the scan line are disposed on the same layer and electrically connected, the gate electrode and the active layer are separated by an insulating layer, the source electrode and the data line are electrically connected, and the drain electrode and the pixel electrode 222 are electrically connected by a contact hole.
In this embodiment, a common electrode 221 is further disposed on a side of the array substrate 22 facing the second liquid crystal layer 23, and the common electrode 221 and the pixel electrode 222 are located on different layers and are insulated and isolated by an insulating layer. The common electrode 221 may be located above or below the pixel electrode 222 (the common electrode 221 is shown below the pixel electrode 222 in fig. 1). Preferably, the common electrode 221 is a planar electrode disposed entirely, and the pixel electrode 222 is a block electrode disposed entirely within each pixel unit or a slit electrode having a plurality of electrode bars to form a fringe field switching pattern (Fringe Field Switching, FFS). Of course, in other embodiments, the pixel electrode 222 and the common electrode 221 are located at the same layer, but are insulated from each other, each of the pixel electrode 222 and the common electrode 221 may include a plurality of electrode bars, and the electrode bars of the pixel electrode 222 and the electrode bars of the common electrode 221 are alternately arranged with each other to form an In-Plane Switching (IPS). Of course, in other embodiments, the pixel electrode 222 is disposed on the side of the array substrate 22 facing the second liquid crystal layer 23, and the common electrode 221 is disposed on the side of the color film substrate 21 facing the second liquid crystal layer 23 to form a TN display mode or a VA display mode, and other descriptions of the TN display mode and the VA display mode are omitted herein.
In this embodiment, a first polarizer 31 is disposed between the light modulation box 10 and the display liquid crystal box 20, a second polarizer 32 is disposed on a side of the display liquid crystal box 20 away from the light modulation box 10, and a third polarizer 33 is disposed on a side of the light modulation box 10 away from the display liquid crystal box 20. The light transmission axes of the first polarizer 31 and the second polarizer 32 are perpendicular to each other, and the light transmission axes of the third polarizer 33 and the first polarizer 31 are parallel to each other. Of course, a compensation film, such as a viewing angle compensation film, a brightness compensation film, etc., may be further provided between the dimming cell 10 and the display liquid crystal cell 20, so that the viewing angle effect of the display may be increased.
The first substrate 421, the second substrate 422, the third substrate 11, the fourth substrate 12, the color film substrate 21, and the array substrate 22 may be made of transparent substrates such as glass, acrylic, and polycarbonate. The viewing angle auxiliary electrode 111, the viewing angle control electrode 121, the first electrode 421a, the second electrode 422a, the common electrode 221, and the pixel electrode 222 may be made of a transparent electrode such as Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO).
There is also provided in the present embodiment a driving method of a display device for driving the display device as described above, the driving method including:
Fig. 6 is a schematic structural diagram of a display device at a maximum viewing angle according to a first embodiment of the present invention. Fig. 7 is a schematic diagram of a display device with a wide viewing angle in the middle according to the first embodiment of the invention. Fig. 8 is a schematic structural diagram of a display device at a minimum wide viewing angle according to a first embodiment of the present invention. As shown in fig. 6 to 8, in the wide viewing angle display, the display panel is controlled to switch to the wide viewing angle mode, the light scattering range of the backlight module 40 is adjusted to control the viewing angle range of the wide viewing angle display, and the polymer liquid crystal layer 423 in the present embodiment is exemplified by polymer dispersed liquid crystal.
Specifically, in the wide viewing angle display, no electric signal is applied to both the viewing angle auxiliary electrode 111 and the viewing angle control electrode 121, and at this time, the liquid crystal molecules in the first liquid crystal layer 13 are in a lying posture, and the display panel is in the wide viewing angle mode. By adjusting the pressure difference between the first electrode 421a and the second electrode 422a, the haze of the polymer liquid crystal layer 423 may be adjusted to control the light scattering range of the backlight module 40, thereby controlling the viewing angle range of the wide viewing angle display. As shown in fig. 6, when no electric signal is applied to the first electrode 421a and the second electrode 422a at the maximum viewing angle, the polymer liquid crystal layer 423 is in a fog state and has the highest haze, and at this time, the polymer liquid crystal layer 423 has the strongest light scattering effect, and the light of the backlight 41 is scattered through the polymer liquid crystal layer 423 and then emitted through the display panel, so that the viewing angle of the display device with a wide viewing angle is wider. As shown in fig. 8, when the voltage signal of the maximum voltage difference (e.g., greater than 15V) is applied to the first electrode 421a and the second electrode 422a at the minimum wide viewing angle, the polymer liquid crystal layer 423 is transparent and has the minimum haze, and at this time, the polymer liquid crystal layer 423 has no light scattering effect, and the light of the backlight 41 is not scattered substantially through the polymer liquid crystal layer 423 and exits through the display panel, so that the viewing angle range of the display device during wide viewing angle display is not substantially affected. Of course, as shown in fig. 7, at the middle wide viewing angle, the haze of the polymer dispersed liquid crystal may be adjusted by adjusting the pressure difference (e.g., 0-15V) between the first electrode 421a and the second electrode 422a, so as to control the light scattering range of the backlight module 40, thereby controlling the viewing angle range of the display device for displaying at the wide viewing angle.
In the wide viewing angle display, a common voltage is applied to the common electrode 221, a corresponding gray scale voltage is applied to the pixel electrode 222, a voltage difference is formed between the pixel electrode 222 and the common electrode 221, and a horizontal electric field (E1 in fig. 6 to 8) is generated, and the positive liquid crystal molecules in the second liquid crystal layer 23 are deflected in the horizontal direction, so that gray scale display is realized while controlling the intensity of light passing through the second liquid crystal layer 23. The gray scale voltages include 0 to 255 gray scale voltages, and when the pixel electrode 222 applies different gray scale voltages, the pixel unit presents different brightness, so that different pictures are displayed under a wide viewing angle, and normal display of the display device under the wide viewing angle is realized.
Fig. 9 is a schematic structural diagram of a display device according to a first embodiment of the invention at a maximum narrow viewing angle. Fig. 10 is a schematic diagram of a display device according to a first embodiment of the present invention at a middle narrow viewing angle. Fig. 11 is a schematic structural diagram of a display device at a minimum narrow viewing angle according to a first embodiment of the present invention. As shown in fig. 9 to 11, in the case of the narrow viewing angle display, the display panel is switched to the narrow viewing angle mode, and the light scattering range of the backlight module 40 is adjusted to control the viewing angle range of the narrow viewing angle display, and the polymer liquid crystal layer 423 in the present embodiment is exemplified by polymer dispersed liquid crystal.
Specifically, in the case of narrow viewing angle display, corresponding electrical signals are applied to the viewing angle auxiliary electrode 111 and the viewing angle control electrode 121, a strong vertical electric field is formed between the viewing angle auxiliary electrode 111 and the viewing angle control electrode 121, and positive liquid crystal molecules in the first liquid crystal layer 13 deflect in the vertical direction and take an inclined posture, and at this time, the display panel takes a light receiving state under a large viewing angle (i.e., the brightness under a large viewing angle is reduced), so that a narrow viewing angle mode is realized. By adjusting the pressure difference between the first electrode 421a and the second electrode 422a, the haze of the polymer liquid crystal layer 423 may be adjusted to control the light scattering range of the backlight module 40, thereby controlling the viewing angle range of the narrow viewing angle display. As shown in fig. 9, at the maximum narrow viewing angle, the first electrode 421a and the second electrode 422a both apply a voltage signal with the maximum voltage difference (e.g., greater than 15V), the polymer liquid crystal layer 423 is transparent and has the minimum haze, at this time, the polymer liquid crystal layer 423 has no light scattering effect, and the light of the backlight 41 is not scattered substantially through the polymer liquid crystal layer 423 and exits through the display panel, so that the viewing angle range of the display device during the narrow viewing angle display is not substantially affected. As shown in fig. 11, when no electric signal is applied to the first electrode 421a and the second electrode 422a at the minimum narrow viewing angle, the polymer liquid crystal layer 423 is in a fog state and has the highest haze, and at this time, the polymer liquid crystal layer 423 has the strongest light scattering effect, and the light of the backlight 41 is scattered through the polymer liquid crystal layer 423 and then emitted through the display panel, so that the viewing angle of the display screen of the display device with the narrow viewing angle becomes wider. Of course, as shown in fig. 10, at the middle narrow viewing angle, the haze of the polymer dispersed liquid crystal may be adjusted by adjusting the pressure difference (e.g., 0-15V) between the first electrode 421a and the second electrode 422a, so as to control the light scattering range of the backlight module 40, thereby controlling the viewing angle range of the display device for narrow viewing angle display.
In the case of the narrow viewing angle display, a common voltage is applied to the common electrode 221, a corresponding gray scale voltage is applied to the pixel electrode 222, a voltage difference is formed between the pixel electrode 222 and the common electrode 221 and a horizontal electric field is generated (E1 in fig. 9 to 11), and the positive liquid crystal molecules in the second liquid crystal layer 23 are deflected in the horizontal direction, thereby realizing gray scale display while controlling the intensity of light passing through the second liquid crystal layer 23. The gray scale voltages include 0 to 255 gray scale voltages, and when the pixel electrode 222 applies different gray scale voltages, the pixel unit presents different brightness, so that different pictures are displayed under the narrow viewing angle, and normal display of the display device under the narrow viewing angle is realized.
During the wide viewing angle display and the narrow viewing angle display, the light-emitting brightness of the backlight module 40 is adjusted according to the light scattering range of the backlight module 40, so that the central brightness of the display device is maintained within a preset range. Since the polymer liquid crystal layer 423 has different light scattering effects at different haze values, the center luminance of the display device may be affected by the haze of the polymer liquid crystal layer 423, and the higher the haze of the polymer liquid crystal layer 423, the lower the center luminance of the display device, the more transparent the polymer liquid crystal layer 423, and the higher the center luminance of the display device. The following table one shows the effect of the polymer liquid crystal layer 423 on the center luminance of the display device and the effect of the 45 ° luminance to center luminance ratio at different haze values when displaying a wide viewing angle, as shown in the following table one:
45 DEG brightness/center brightness Voltage (V) Center brightness
10％ 2V～3V 350nits
5％ 5V 500nits
3％ 6V～7V 750nits
1％～2％ 15V 850nits
As can be seen from the above table, the smaller the pressure difference between the first electrode 421a and the second electrode 422a, the higher the haze of the polymer liquid crystal layer 423, and the lower the center luminance of the display device. Therefore, the light-emitting brightness of the backlight module 40 is adjusted according to the light-diffusing range of the backlight module 40, and the light of the backlight module 40 is compensated, so that the central brightness of the display device can be maintained within the preset range, and a better use feeling can be provided for the user. Moreover, as can be seen from the above table, in the present application, by disposing the polymer liquid crystal layer 423 in the backlight module, the ratio of the 45 ° brightness to the center brightness can be adjusted in the range of about 1% -15% during the wide viewing angle display, and compared with the prior art in which the ratio of the 45 ° brightness to the center brightness is fixed at about 1.1% during the wide viewing angle display, the present application can adjust the ratio of the 45 ° brightness to the center brightness by adjusting the haze of the polymer liquid crystal layer 423, thereby adjusting the display effect of the wide viewing angle. Similarly, the present application can also adjust the display effect of the narrow viewing angle by adjusting the haze of the polymer liquid crystal layer 423.
Fig. 12 is a control signal transmission schematic diagram of a display device according to a first embodiment of the application. As shown in fig. 12, the driving method further includes:
Ambient light levels are monitored. Specifically, the display device is also provided with a light-sensitive sensor, and the light-sensitive sensor is used for monitoring the brightness of the environment.
When the ambient light brightness is greater than or equal to a preset brightness (for example, 300 nits), the display device is controlled to switch to display with a wide viewing angle; when the ambient light brightness is less than the preset brightness (for example, 300 nits), the display device is controlled to switch to display with a narrow viewing angle. Because the dimming box 10 has a light receiving effect when the viewing angle is narrow, the brightness of the display device can be reduced to a certain extent, and therefore, when the ambient light brightness is greater than or equal to the preset brightness (for example, 300 nits), the brightness of the display device can be increased by switching to the wide viewing angle display, so that the user can see the displayed picture clearly under the brighter ambient light; when the ambient light brightness is less than the preset brightness (for example, 300 nits), the brightness of the display device can be reduced by switching to the narrow-view display, so that a certain protection effect is provided for eyes of a user under darker ambient light. Of course, after automatically switching to the wide-angle display or the narrow-angle display, the user can also manually switch between the wide-angle display and the narrow-angle display.
Example two
Fig. 13 is a schematic diagram of a display device with a wide viewing angle according to a second embodiment of the present invention. Fig. 15 is a schematic structural diagram of a display device with a narrow viewing angle according to a second embodiment of the present invention. As shown in fig. 13 and 15, the display device with switchable viewing angle and the driving method thereof according to the second embodiment of the present invention are substantially the same as those of the first embodiment (fig. 1 to 12), except that in the present embodiment:
The first liquid crystal layer 13 includes liquid crystal molecules 131 and dye molecules 132 mixed with each other, and the liquid crystal molecules 131 are positive liquid crystal molecules, that is, liquid crystal molecules having positive dielectric anisotropy. Referring to fig. 13, at the initial state, the liquid crystal molecules 131 and the dye molecules 132 are aligned parallel to the third and fourth substrates 11 and 12, and the alignment direction of the first liquid crystal layer 13 near the third substrate 11 side and the alignment direction near the fourth substrate 12 side are parallel to each other (forward parallel or anti-parallel), so that the dimming cartridge 10 is in a wide viewing angle state at the initial state. The liquid crystal molecules 131 and the dye molecules 132 may have a small initial pretilt angle between the third substrate 11 and the fourth substrate 12, and the range of the initial pretilt angle may be less than or equal to 5 degrees, that is: 0 DEG.ltoreq.0.ltoreq.5 DEG to reduce the response time of the vertical deflection of the positive liquid crystal molecules, i.e. to reduce the response time of switching between wide viewing angles and narrow viewing angles. Of course, in other embodiments, the first liquid crystal layer 13 includes the liquid crystal molecules 131 and the dye molecules 132 mixed with each other, and the liquid crystal molecules 131 may be negative liquid crystal molecules, that is, liquid crystal molecules having negative dielectric anisotropy. The liquid crystal molecules 131 and the dye molecules 132 are aligned obliquely to the third and fourth substrates 11 and 12, so that the dimming cell 10 is in a narrow viewing angle state at the time of an initial state. The dye molecule 132 has the characteristic that the long axis has strong light absorption capability and the short axis has weak light absorption capability, so that when the display is performed at a narrow viewing angle, the dye molecule 132 can absorb part of light, thereby increasing the light receiving effect at the narrow viewing angle and improving the effect at the narrow viewing angle.
There is also provided in the present embodiment a driving method of a display device for driving the display device as described above, the driving method including:
as shown in fig. 13, in the wide viewing angle display, the display panel is controlled to switch to the wide viewing angle mode, and the light scattering range of the backlight module 40 is adjusted to control the viewing angle range of the wide viewing angle display, and the polymer liquid crystal layer 423 in the present embodiment is exemplified by polymer dispersed liquid crystal.
Specifically, in the wide viewing angle display, no electric signal is applied to both the viewing angle auxiliary electrode 111 and the viewing angle control electrode 121, and at this time, the liquid crystal molecules in the first liquid crystal layer 13 are in a lying posture, and the display panel is in the wide viewing angle mode. By adjusting the pressure difference between the first electrode 421a and the second electrode 422a, the haze of the polymer liquid crystal layer 423 may be adjusted to control the light scattering range of the backlight module 40, thereby controlling the viewing angle range of the wide viewing angle display. When the viewing angle is maximum, no electric signal is applied to the first electrode 421a and the second electrode 422a, the polymer liquid crystal layer 423 is in a fog state and has the highest haze, and at this time, the polymer liquid crystal layer 423 has the strongest light scattering effect, and the light of the backlight 41 is scattered through the polymer liquid crystal layer 423 and then emitted through the display panel, so that the viewing angle of the display device with a wide viewing angle is wider. In the minimum wide viewing angle, the first electrode 421a and the second electrode 422a both apply the voltage signal of the maximum voltage difference (e.g. greater than 15V), the polymer liquid crystal layer 423 is transparent and has the minimum haze, at this time, the polymer liquid crystal layer 423 has no light scattering effect, and the light of the backlight 41 is not scattered through the polymer liquid crystal layer 423 and exits through the display panel, so that the viewing angle range of the display device in the wide viewing angle display is not affected. Of course, in the middle wide viewing angle, the haze of the polymer dispersed liquid crystal can be adjusted by adjusting the pressure difference (e.g., 0-15V) between the first electrode 421a and the second electrode 422a, so as to control the light scattering range of the backlight module 40, thereby controlling the viewing angle range of the display device for displaying the wide viewing angle.
In the wide viewing angle display, a common voltage is applied to the common electrode 221, a corresponding gray scale voltage is applied to the pixel electrode 222, a voltage difference is formed between the pixel electrode 222 and the common electrode 221 and a horizontal electric field is generated (E1 in fig. 13), and the positive liquid crystal molecules in the second liquid crystal layer 23 are deflected in the horizontal direction, so that gray scale display is realized while controlling the intensity of light passing through the second liquid crystal layer 23. The gray scale voltages include 0 to 255 gray scale voltages, and when the pixel electrode 222 applies different gray scale voltages, the pixel unit presents different brightness, so that different pictures are displayed under a wide viewing angle, and normal display of the display device under the wide viewing angle is realized.
As shown in fig. 15, in the case of the narrow viewing angle display, the display panel is switched to the narrow viewing angle mode, and the light scattering range of the backlight module 40 is adjusted to control the viewing angle range of the narrow viewing angle display, and the polymer liquid crystal layer 423 in the present embodiment is exemplified by polymer dispersed liquid crystal.
Specifically, in the case of narrow viewing angle display, corresponding electrical signals are applied to the viewing angle auxiliary electrode 111 and the viewing angle control electrode 121, a strong vertical electric field is formed between the viewing angle auxiliary electrode 111 and the viewing angle control electrode 121, and positive liquid crystal molecules in the first liquid crystal layer 13 deflect in the vertical direction and take an inclined posture, and at this time, the display panel takes a light receiving state under a large viewing angle (i.e., the brightness under a large viewing angle is reduced), so that a narrow viewing angle mode is realized. By adjusting the pressure difference between the first electrode 421a and the second electrode 422a, the haze of the polymer liquid crystal layer 423 may be adjusted to control the light scattering range of the backlight module 40, thereby controlling the viewing angle range of the narrow viewing angle display. At the maximum narrow viewing angle, the first electrode 421a and the second electrode 422a both apply a voltage signal with the maximum voltage difference (e.g. greater than 15V), the polymer liquid crystal layer 423 is transparent and has the minimum haze, at this time, the polymer liquid crystal layer 423 has no light scattering effect, and the light of the backlight 41 is not scattered substantially through the polymer liquid crystal layer 423 and exits through the display panel, so that the viewing angle range of the display device during the display at the narrow viewing angle is not affected substantially. When the minimum viewing angle is narrow, no electric signal is applied to the first electrode 421a and the second electrode 422a, the polymer liquid crystal layer 423 is in a fog state and has the highest haze, and at this time, the polymer liquid crystal layer 423 has the strongest light scattering effect, and the light of the backlight 41 can be scattered through the polymer liquid crystal layer 423 and then emitted through the display panel, so that the viewing angle of the display screen of the display device with the narrow viewing angle is wider. Of course, in the middle of the narrow viewing angle, the haze of the polymer dispersed liquid crystal may be adjusted by adjusting the pressure difference (e.g., 0-15V) between the first electrode 421a and the second electrode 422a, so as to control the light scattering range of the backlight module 40, thereby controlling the viewing angle range of the display device for displaying the narrow viewing angle.
Since the first liquid crystal layer 13 in this embodiment includes the liquid crystal molecules 131 and the dye molecules 132 mixed with each other, the dye molecules 132 have the characteristics of strong light absorption capability of the long axis and weak light absorption capability of the short axis, and the dye molecules 132 can absorb part of the light during the display at the narrow viewing angle, thereby increasing the light receiving effect at the narrow viewing angle, and improving the narrow viewing angle effect.
Fig. 14 is a simulation diagram of dye molecular lower viewing angle and contrast ratio of different doping ratios at a wide viewing angle for a display device according to the second embodiment of the present invention. Fig. 16 is a simulation diagram of dye molecular down view angle and contrast ratio of different doping ratios at a narrow view angle for a display device according to the second embodiment of the invention. As shown in fig. 14 and 16, a shows a graph of actual measurement when the doping ratio of the dye molecules 132 in the first liquid crystal layer 13 is 0, b shows a graph of actual measurement when the doping ratio of the dye molecules 132 in the first liquid crystal layer 13 is 1%, c shows a graph of actual measurement when the doping ratio of the dye molecules 132 in the first liquid crystal layer 13 is 2%, and d shows a graph of actual measurement when the doping ratio of the dye molecules 132 in the first liquid crystal layer 13 is 3%. As can be seen from fig. 14, the doping ratio of dye molecules has little effect on the wide viewing angle; as can be seen from fig. 16, the doping ratio of dye molecules has a large influence on the effect of the narrow viewing angle.
The following table II is experimental data showing that the doping ratio of dye molecules is 0-3%, please refer to the following table II:
as can be seen from the above table two, when the doping ratio of the dye molecules is 3%, the transmittance is 2.8% when the viewing angle is 45 °, that is, when the viewing angle is 45 °, the display device is basically in a black state, and has a good peep-proof effect.
In the case of the narrow viewing angle display, a common voltage is applied to the common electrode 221, a corresponding gray scale voltage is applied to the pixel electrode 222, a voltage difference is formed between the pixel electrode 222 and the common electrode 221 and a horizontal electric field is generated (E1 in fig. 9 to 11), and the positive liquid crystal molecules in the second liquid crystal layer 23 are deflected in the horizontal direction, thereby realizing gray scale display while controlling the intensity of light passing through the second liquid crystal layer 23. The gray scale voltages include 0 to 255 gray scale voltages, and when the pixel electrode 222 applies different gray scale voltages, the pixel unit presents different brightness, so that different pictures are displayed under the narrow viewing angle, and normal display of the display device under the narrow viewing angle is realized.
During the wide viewing angle display and the narrow viewing angle display, the light-emitting brightness of the backlight module 40 is adjusted according to the light scattering range of the backlight module 40, so that the central brightness of the display device is maintained within a preset range. Since the polymer liquid crystal layer 423 has different light scattering effects at different haze values, the center luminance of the display device may be affected by the haze of the polymer liquid crystal layer 423, and the higher the haze of the polymer liquid crystal layer 423, the lower the center luminance of the display device, the more transparent the polymer liquid crystal layer 423, and the higher the center luminance of the display device.
The driving method further includes:
ambient light levels are monitored. Specifically, the display device is also provided with a light-sensitive sensor, and the light-sensitive sensor is used for monitoring the brightness of the environment.
When the ambient light brightness is greater than or equal to a preset brightness (for example, 300 nits), the display device is controlled to switch to display with a wide viewing angle; when the ambient light brightness is less than the preset brightness (for example, 300 nits), the display device is controlled to switch to display with a narrow viewing angle. Because the dimming box 10 has a light receiving effect when the viewing angle is narrow, the brightness of the display device can be reduced to a certain extent, and therefore, when the ambient light brightness is greater than or equal to the preset brightness (for example, 300 nits), the brightness of the display device can be increased by switching to the wide viewing angle display, so that the user can see the displayed picture clearly under the brighter ambient light; when the ambient light brightness is less than the preset brightness (for example, 300 nits), the brightness of the display device can be reduced by switching to the narrow-view display, so that a certain protection effect is provided for eyes of a user under darker ambient light. Of course, the display is automatically switched to the wide viewing angle display or.
Those skilled in the art will understand that the other structures and working principles of the present embodiment are the same as those of the first embodiment, and will not be described herein.
Fig. 17 and 18 are schematic plan view structures of a display device according to an embodiment of the present invention, please refer to fig. 17 and 18, wherein the display device is provided with a viewing angle switching key 50 for a user to send a viewing angle switching request to the display device. The view angle switching key 50 may be a physical key (as shown in fig. 17), or may be a software control or Application (APP) to implement a switching function (as shown in fig. 18, for example, by setting a wide and narrow view angle by a slider bar). When a user needs to switch between a wide viewing angle and a narrow viewing angle, a viewing angle switching request can be sent to the display device by operating the viewing angle switching key 50, and finally, the driving chip 60 controls the electric signals applied to the viewing angle auxiliary electrode 111, the viewing angle control electrode 121, the first electrode 421a, the second electrode 422a and the backlight 41, so that the display device can realize the switching between the wide viewing angle and the narrow viewing angle, and when the display device is switched to the wide viewing angle, the driving method adopts the driving method corresponding to the wide viewing angle mode, and when the display device is switched to the narrow viewing angle, the driving method adopts the driving method corresponding to the narrow viewing angle mode. In addition, in the wide viewing angle display and the narrow viewing angle display, the haze of the polymer liquid crystal layer 423 is adjusted to control the light scattering range of the backlight module 40, thereby controlling the viewing angle range under the wide viewing angle display and the narrow viewing angle display.
Fig. 19 is a schematic perspective view of a display device according to the present application. As shown in fig. 19, the display device is a computer, and the viewing angle switching key 50 may be a key on a keyboard of the computer, for example:
click the F2 key 1 time: entering an NVA (narrow view angle) mode; click the F2 key 2 times: a WVA (wide view) mode is entered.
After entering WVA mode, click the F3 button: switching to WVA gear 1; clicking the F4 key: switching to WVA gear 2; clicking the F5 key: switching to WVA gear 3.
After entering NVA mode, click F3 button: switching to NVA gear 1; clicking the F4 key: switching to NVA gear 2; clicking the F5 key: switching to NVA gear 3.
Further, the brightness fine adjustment or the visual angle range fine adjustment can be performed through the + key and the-key on the computer keyboard.
In this document, terms such as up, down, left, right, front, rear, etc. are defined by the positions of the structures in the drawings and the positions of the structures with respect to each other, for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the claimed application. It should also be understood that the terms "first" and "second," etc., as used herein, are used merely for distinguishing between names and not for limiting the number and order.
The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.

Claims (10)

1. The display device with the switchable viewing angle is characterized by comprising a backlight module (40) and a display panel arranged on the light emitting side of the backlight module (40), wherein the display panel can be switched between a wide viewing angle and a narrow viewing angle;
the backlight module (40) comprises a backlight source (41) and a first liquid crystal box (42) which is laminated on the light emitting side of the backlight source (41), the first liquid crystal box (42) is used for controlling the light scattering range of the backlight module (40), the first liquid crystal box (42) comprises a first substrate (421), a second substrate (422) which is arranged opposite to the first substrate (421) and a polymer liquid crystal layer (423) which is arranged between the first substrate (421) and the second substrate (422), a first electrode (421 a) is arranged on the first substrate (421), and a second electrode (422 a) which is matched with the first electrode (421 a) is arranged on the second substrate (422);
When the display panel is switched to a wide viewing angle mode during wide viewing angle display, the light scattering range of the backlight module (40) is adjusted to control the viewing angle range of the wide viewing angle display;
when the display panel is switched to the narrow viewing angle mode during the narrow viewing angle display, the astigmatism range of the backlight module (40) is adjusted to control the viewing angle range of the narrow viewing angle display.
2. The viewing-angle switchable display device according to claim 1, wherein the polymer liquid crystal layer (423) is a polymer dispersed liquid crystal, a polymer network liquid crystal or a polymer stabilized cholesteric liquid crystal.
3. The viewing-angle switchable display device according to claim 1, wherein the backlight module (40) further comprises a diffuser (43), the diffuser (43) being laminated between the backlight (41) and the first liquid crystal cell (42);
or the diffusion sheet (43) is laminated on the side of the first liquid crystal cell (42) away from the backlight (41).
4. A viewing angle switchable display device according to any of claims 1-3, characterized in that the display panel comprises a dimming cell (10) and a display liquid crystal cell (20) arranged one above the other, the dimming cell (10) being adapted to control the display panel to switch between a wide viewing angle and a narrow viewing angle;
The dimming box (10) comprises a third substrate (11), a fourth substrate (12) arranged opposite to the third substrate (11) and a first liquid crystal layer (13) arranged between the third substrate (11) and the fourth substrate (12), wherein a viewing angle auxiliary electrode (111) is arranged on the third substrate (11), and a viewing angle control electrode (121) matched with the viewing angle auxiliary electrode (111) is arranged on the fourth substrate (12);
the display liquid crystal box (20) comprises a color film substrate (21), an array substrate (22) arranged opposite to the color film substrate (21) and a second liquid crystal layer (23) arranged between the color film substrate (21) and the array substrate (22).
5. The viewing-angle switchable display device according to claim 4, wherein the third substrate (11) is provided with a first prism structure (112), the first prism structure (112) having an astigmatic effect;
and/or, a second prism structure (122) is arranged on the fourth substrate (12), and the second prism structure (122) has an astigmatism effect.
6. The viewing-angle switchable display device according to claim 4, wherein the first liquid crystal layer (13) employs positive liquid crystal molecules aligned parallel to the third substrate (11) and the fourth substrate (12), and an alignment direction of a side of the first liquid crystal layer (13) close to the third substrate (11) and an alignment direction of a side close to the fourth substrate (12) are mutually parallel;
Or, the first liquid crystal layer (13) adopts negative liquid crystal molecules which are aligned obliquely to the third substrate (11) and the fourth substrate (12).
7. The viewing-angle switchable display device according to claim 4, wherein the first liquid crystal layer (13) comprises liquid crystal molecules (131) and dye molecules (132) mixed with each other, the liquid crystal molecules (131) being positive liquid crystal molecules, the liquid crystal molecules (131) and the dye molecules (132) being aligned parallel to the third substrate (11) and the fourth substrate (12), an alignment direction of a side of the first liquid crystal layer (13) near the third substrate (11) and an alignment direction of a side near the fourth substrate (12) being parallel to each other;
or, the first liquid crystal layer (13) includes liquid crystal molecules (131) and dye molecules (132) mixed with each other, the liquid crystal molecules (131) are negative liquid crystal molecules, and the liquid crystal molecules (131) and the dye molecules (132) are aligned obliquely to the third substrate (11) and the fourth substrate (12).
8. The viewing-angle switchable display device according to claim 4, wherein a common electrode (221) and a pixel electrode (222) are disposed on the array substrate (22), and the common electrode (221) and the pixel electrode (222) are located at different layers and are insulated from each other;
Or, the array substrate (22) is provided with a pixel electrode (222), and the color film substrate (21) is provided with a common electrode (221) matched with the pixel electrode (222).
9. A driving method of a display device, characterized in that the driving method is for driving the display device according to any one of claims 1 to 8, the driving method comprising:
when the wide-view angle display is performed, the display panel is controlled to be switched into a wide-view angle mode, and the astigmatism range of the backlight module (40) is adjusted to control the view angle range of the wide-view angle display;
when the display panel is switched to a narrow viewing angle mode during narrow viewing angle display, the astigmatism range of the backlight module (40) is adjusted to control the viewing angle range of the narrow viewing angle display;
and when the display is performed at a wide viewing angle and a narrow viewing angle, the luminous brightness of the backlight module (40) is adjusted according to the astigmatism range of the backlight module (40), so that the central brightness of the display device is maintained within a preset range.
10. The driving method according to claim 9, characterized in that the driving method further comprises:
monitoring the ambient light level;
when the ambient light brightness is greater than or equal to the preset brightness, the display device is controlled to be switched to display with a wide viewing angle; and when the ambient light brightness is smaller than the preset brightness, controlling the display device to switch to display with a narrow viewing angle.
CN202310497996.0A 2023-05-05 2023-05-05 Display device with switchable viewing angle and driving method thereof Pending CN116643421A (en)

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CN202310497996.0A CN116643421A (en) 2023-05-05 2023-05-05 Display device with switchable viewing angle and driving method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310497996.0A CN116643421A (en) 2023-05-05 2023-05-05 Display device with switchable viewing angle and driving method thereof

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