CN112198724B - Liquid crystal display device having a plurality of pixel electrodes - Google Patents
Liquid crystal display device having a plurality of pixel electrodes Download PDFInfo
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- CN112198724B CN112198724B CN202011095722.1A CN202011095722A CN112198724B CN 112198724 B CN112198724 B CN 112198724B CN 202011095722 A CN202011095722 A CN 202011095722A CN 112198724 B CN112198724 B CN 112198724B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 164
- 239000000758 substrate Substances 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000010287 polarization Effects 0.000 claims description 11
- 238000005192 partition Methods 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims description 9
- 230000005684 electric field Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 abstract description 11
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- 230000003287 optical effect Effects 0.000 description 10
- 238000004088 simulation Methods 0.000 description 9
- 238000002834 transmittance Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 8
- 239000010409 thin film Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 2
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1347—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
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Abstract
The invention discloses a liquid crystal display device and a driving method thereof, wherein the liquid crystal display device comprises a display panel and a light modulator, the light modulator comprises a third substrate, a fourth substrate and a second liquid crystal layer arranged between the third substrate and the fourth substrate, the second liquid crystal layer comprises first liquid crystal and second liquid crystal, the third substrate comprises a third substrate and a first electrode, the first electrode is arranged on the third substrate, the first electrode is divided into a plurality of sub-electrodes, the fourth substrate comprises a fourth substrate and a second electrode, and the second electrode is arranged on the fourth substrate. In the liquid crystal display device and the driving method thereof, the liquid crystal display device can realize the regional control of the pressure difference between the pixel electrode and the upper common electrode, and realize the regional control of the wide and narrow visual angle display; the differential pressure between the lower common electrode and the pixel electrode can also realize regional control, realize regional dimming, improve the contrast of the liquid crystal display device and improve the display effect; the switching between single view field and double view field can be realized by utilizing the property of the second liquid crystal for absorbing light.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a liquid crystal display device.
Background
The liquid crystal display device has the advantages of good picture quality, small volume, light weight, low driving voltage, low power consumption, no radiation and relatively low manufacturing cost, and is dominant in the field of flat panel display.
With the continuous progress of the liquid crystal display technology, the viewing angle of the display has been widened from about 120 ° to over 160 °, and people want to effectively protect business confidentiality and personal privacy while enjoying the visual experience brought by a large viewing angle, so as to avoid business loss or embarrassment caused by the leakage of screen information. Therefore, in addition to the wide viewing angle, the display device is also required to have a function of switching between the wide viewing angle and the narrow viewing angle. However, the current lcd devices generally can only realize a single function such as: a display device partition control display function (Local divide function); the wide and narrow visual angle switching function of the display device; the display device has a local area wide and narrow visual angle switching function; the switching function between the common display mode and the dual-view mode cannot meet the requirement that the functions are realized on the same display device.
Disclosure of Invention
The invention aims to provide a liquid crystal display device which can perform multiple functions such as wide and narrow display, divisional dimming and the like in a divisional manner.
The embodiment of the invention provides a liquid crystal display device, which comprises a display panel and a light modulator, wherein the light modulator is arranged on one side of the display panel, the light modulator comprises a third substrate, a fourth substrate and a second liquid crystal layer arranged between the third substrate and the fourth substrate, the second liquid crystal layer comprises a first liquid crystal and a second liquid crystal, liquid crystal molecules of the second liquid crystal can absorb a large amount of light rays when no electric field exists, the absorptivity of the light rays is reduced under the action of the electric field, the third substrate comprises a third substrate and a first electrode, the first electrode is arranged on the third substrate, the first electrode is divided into a plurality of sub-electrodes, the fourth substrate comprises a fourth substrate and a second electrode, and the second electrode is arranged on the fourth substrate.
In one embodiment, the third substrate further includes a first insulating layer disposed on a side of the first electrode facing the fourth substrate; or, the fourth substrate further includes a first insulating layer disposed on a side of the second electrode facing the third substrate.
In one embodiment, the second liquid crystal is a black dye liquid crystal.
In one embodiment, the liquid crystal display device further includes a backlight module disposed on a side of the display panel away from the light modulator.
In one embodiment, one or more of the sub-electrodes are connected to a first connection line to electrically connect each of the sub-electrodes to an external circuit, and the liquid crystal display device further includes a control circuit, the first connection line being electrically connected to the control circuit; or, the liquid crystal display device further comprises a control circuit, and each sub-electrode is electrically connected or disconnected with the control circuit through a switch element, so that a corresponding voltage signal is applied to each sub-electrode.
In one embodiment, the liquid crystal display device further includes a control device, where the control device is configured to obtain brightness of each region of the display panel, determine a corresponding voltage according to the brightness in the divisional dimming mode, and send a corresponding voltage control signal to the control circuit to control voltages of the first electrode and the second electrode of the dimmer.
In one embodiment, the liquid crystal display device comprises a wide view angle mode, a narrow view angle mode, a wide and narrow view angle partition mode, a partition dimming mode and a dual view field mode; when the liquid crystal display device is in a wide viewing angle mode, applying a voltage with a voltage difference larger than or equal to a first preset value between the first electrode and the second electrode; when the liquid crystal display device is in a narrow viewing angle mode, applying a voltage with a voltage difference smaller than the first preset value and larger than or equal to a second preset value, wherein the second preset value is smaller than the first preset value, between the first electrode and the second electrode; when the liquid crystal display device is in a wide and narrow view angle partition mode, applying a voltage with a voltage difference larger than or equal to the first preset value between part of the first electrodes and the second electrodes, and applying a voltage with a voltage difference smaller than the first preset value and larger than or equal to the second preset value between the rest of the first electrodes and the second electrodes; when the liquid crystal display device is in a zone dimming mode, applying a voltage which is greater than or equal to the first preset value between the first electrode and the second electrode corresponding to a bright-state area of the liquid crystal display device, and applying a voltage which is less than or equal to a third preset value between the first electrode and the second electrode corresponding to a dark-state area, wherein the third preset value is less than the first preset value and the second preset value; when the liquid crystal display device is in a dual-field mode, a voltage which is larger than or equal to the first preset value is applied between the first electrode and the second electrode corresponding to a first area of the liquid crystal display device, a voltage which is smaller than or equal to the third preset value is applied between the first electrode and the second electrode corresponding to a second area of the liquid crystal display device, and the first areas and the second areas are distributed at intervals.
In one embodiment, the liquid crystal display device further includes a first polarizer, a second polarizer and a third polarizer, the first polarizer is located on a side of the display panel away from the light modulator, the second polarizer is located between the display panel and the light modulator, the third polarizer is located on a side of the light modulator away from the display panel, a polarization direction of the third polarizer is parallel to a polarization direction of the second polarizer, and the polarization direction of the first polarizer is perpendicular to polarization directions of the third polarizer and the second polarizer.
The present invention provides a driving method for driving the liquid crystal display device, comprising:
applying a voltage with a voltage difference larger than or equal to a first preset value between the first electrode and the second electrode to realize wide-view-angle display; applying a voltage with a voltage difference smaller than the first preset value and larger than or equal to a second preset value between the first electrode and the second electrode to realize narrow visual angle display, wherein the second preset value is smaller than the first preset value; or, applying a voltage greater than or equal to a first preset value between the first electrode and the second electrode corresponding to a bright state area of the liquid crystal display device, and applying a voltage less than or equal to a third preset value between the first electrode and the second electrode corresponding to a dark state area of the liquid crystal display device to realize a regional dimming function, wherein the third preset value is less than the first preset value; or, a voltage larger than or equal to a first preset value is applied between the first electrode and the second electrode corresponding to the first area of the liquid crystal display device, a voltage smaller than or equal to a third preset value is applied between the first electrode and the second electrode corresponding to the second area, the third preset value is smaller than the first preset value, and the plurality of first areas and the plurality of second areas are distributed at intervals along the horizontal direction or the vertical direction, so that a dual-view-field mode is realized.
In one embodiment, in the divisional dimming mode, the brightness of each region of the display panel is obtained, and the voltage difference between the first electrode and the second electrode at the corresponding position is determined according to the brightness of each region, so as to control the voltages of the first electrode and the second electrode of the dimmer; alternatively, the first and second electrodes may be,
and applying a voltage with a voltage difference larger than or equal to the first preset value between part of the first electrodes and the second electrodes, and applying a voltage with a voltage difference smaller than the first preset value and larger than or equal to the second preset value between the rest of the first electrodes and the second electrodes to realize wide and narrow view angle area display.
In the liquid crystal display device and the driving method thereof, because the lower common electrode and the pixel electrode are divided into a plurality of blocks, the liquid crystal display device can realize the regional control of the pressure difference between the pixel electrode and the upper common electrode and realize the regional control of the wide and narrow visual angle display; in addition, the differential pressure between the lower common electrode and the pixel electrode can also realize regional control, thereby realizing regional dimming, improving the contrast of the liquid crystal display device and improving the display effect of the liquid crystal display device; meanwhile, the switching between the single view field and the double view field can be realized by utilizing the performance of the second liquid crystal for absorbing light.
Drawings
Fig. 1 is a schematic structural diagram of a liquid crystal display device according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a first electrode of the lcd device shown in fig. 1.
Fig. 3 is another schematic structural diagram of the first electrode of the liquid crystal display device shown in fig. 1.
Fig. 4 is a schematic view of the liquid crystal display device shown in fig. 1 in a dual view mode.
Fig. 5 is a voltage waveform diagram of the first electrode and the second electrode in the wide and narrow viewing angle mode of the liquid crystal display device shown in fig. 1.
Fig. 6 is a voltage waveform diagram of the first electrode and the second electrode of the liquid crystal display device shown in fig. 1 in the divisional dimming mode.
Fig. 7 is a voltage-luminance graph of the liquid crystal display device shown in fig. 1.
Fig. 8 is a voltage waveform diagram of the first electrode and the second electrode in the dual field mode of the liquid crystal display device shown in fig. 1.
Fig. 9a is a simulation diagram of full-view optical transmittance measurement of the backlight module of the lcd shown in fig. 1.
FIG. 9b is a simulation diagram of full-view optical transmittance measurement of the liquid crystal display device shown in FIG. 1 when the voltage of the first electrode is 0V.
FIG. 9c is a graph showing the transmittance simulation of the full-view optical measurement of the liquid crystal display device shown in FIG. 1 when the voltage of the first electrode is 2.5V.
FIG. 9d is a simulation diagram of full-view optical transmittance measurement of the liquid crystal display device shown in FIG. 1 when the voltage of the first electrode is 5V.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.
First embodiment
Fig. 1 is a schematic structural diagram of a liquid crystal display device according to a first embodiment of the invention. Referring to fig. 1, the lcd device of the first embodiment includes a display panel 10 and a light modulator 30, wherein the light modulator 30 is disposed on one side of the display panel 10. Specifically, in the present embodiment, the light modulator 30 is disposed on the light emitting side of the display panel 10.
In this embodiment, the display panel 10 is a liquid crystal display panel (LCD) including a first substrate 102, a second substrate 104, and a first liquid crystal layer 106 disposed between the first substrate 102 and the second substrate 104. It will be appreciated that the display panel 10 may also be other types of display panels, such as an OLED (light emitting diode display panel). Specifically, the first substrate 102 may be an array substrate, and the second substrate 104 may be a color filter substrate. More specifically, the first substrate 102 is divided into a plurality of pixel regions by data lines and scanning lines, the first substrate 102 includes a first substrate, thin film transistors, pixel electrodes and a common electrode, the thin film transistors arranged in an array are disposed on the first substrate, each pixel region is provided with one thin film transistor, the pixel electrodes and the common electrode are arranged at intervals in an insulating manner, the pixel electrodes are comb-shaped, and each pixel electrode is electrically connected to a drain electrode of one thin film transistor. The second substrate 104 includes a color resistance layer including a plurality of color resistances, and a light shielding layer is disposed between adjacent color resistances.
In the present embodiment, the dimmer 30 includes a third substrate 302, a fourth substrate 304, and a second liquid crystal layer 306 disposed between the third substrate 302 and the fourth substrate 304. In the present embodiment, the second liquid crystal layer 306 includes a first liquid crystal 3062 and a second liquid crystal 3064. Specifically, the first liquid crystals 3062 may be positive liquid crystals, and the optical path difference of the first liquid crystals 3062 may be greater than 700 nanometers (nm), and more specifically, the optical path difference of the first liquid crystals 3062 may be 1393nm. An included angle between the alignment direction of the liquid crystal molecules of the first liquid crystal 3062 and the light receiving direction of the liquid crystal display device when realizing a narrow viewing angle is 90 °. The angle between the alignment direction of the liquid crystal molecules of the second liquid crystal 3064 and the light receiving direction of the liquid crystal display device when a narrow viewing angle is achieved may also be 90 °. Specifically, the second liquid crystal 3064 is a black dye liquid crystal, and its liquid crystal molecules absorb a lot of light in the absence of an electric field, and the absorption rate of light is lower and lower as the liquid crystal molecules tilt under the action of the electric field.
In this embodiment, the third substrate 302 includes a third substrate 308 and a first electrode 312. The first electrode 312 is divided into a plurality of sub-electrodes 314. Specifically, the first electrode 312 is provided over the third substrate 308, and specifically, the first electrode 312 is provided on a side of the third substrate 308 facing the second liquid crystal layer 306. The third substrate 302 may further include a first insulating layer 316, and the first insulating layer 316 is disposed on the first electrode 312. The first insulating layer 316 may specifically be a PV layer.
In this embodiment, the fourth substrate 304 includes a fourth substrate 320 and a second electrode 322, and the second electrode 322 is disposed on the fourth substrate 320. The second electrode 322 may be a monolithic electrode. Specifically, the second electrode 322 is provided on a side of the fourth substrate 320 facing the second liquid crystal layer 306. The first insulating layer 316 may prevent the first and second electrodes 312 and 322 on the third and fourth substrates 302 and 304 from being shorted. It is understood that the first insulating layer 316 can also be disposed on the side of the second electrode 322 facing the third substrate 302.
In this embodiment, the liquid crystal display device further includes a first polarizer 52, a second polarizer 54, and a third polarizer 56, where the first polarizer 52 is located on a side of the display panel 10 away from the light modulator 30, the second polarizer 54 is located between the display panel 10 and the light modulator 30, and the third polarizer 56 is located on a side of the light modulator 30 away from the display panel 10. The polarization direction of the third polarizer 56 is parallel to the polarization direction of the second polarizer 54, and the first polarizer 52 is perpendicular to the polarization directions of the third polarizer 56 and the second polarizer 54. Specifically, the direction of the transmission axis of the first polarizer 52 is 0 ° (0 ° refers to a direction parallel to the horizontal direction), and the directions of the transmission axes of the second and third polarizers 54 and 56 are 90 °. The directions of the transmission axes of the second and third polarizers 54 and 56 are parallel to the alignment direction of the liquid crystal molecules of the second liquid crystal 3064.
In this embodiment, the liquid crystal display device further includes a backlight module 70, and the backlight module 70 is disposed on a side of the display panel 10 away from the light modulator 30.
Fig. 2 is a schematic structural diagram of a first electrode of the lcd device shown in fig. 1. Referring to fig. 2, in the present embodiment, one or more sub-electrodes 314 are connected to a first connection line 330 to electrically connect each sub-electrode 314 with an external circuit, so as to apply a desired voltage to the first electrode 312. In the present embodiment, some of the sub-electrodes 314 are connected to a first connection line 330, some of the two sub-electrodes 314 are connected to a first connection line 330, and some of the three sub-electrodes 314 are connected to a first connection line 330, that is, if one first connection line 330 is connected to several sub-electrodes 314 at the same time, the voltages applied to the sub-electrodes 314 connected to the same first connection line 330 are the same.
In this embodiment, the lcd device may further include a control circuit (not shown) electrically connected to the first connection line 330 for applying a corresponding voltage signal to the first electrode 312 through the control circuit.
Fig. 3 is another schematic structural diagram of the first electrode of the lcd shown in fig. 1. Referring to fig. 3, in another embodiment, each sub-electrode 314 is electrically connected to or disconnected from the control circuit through a switch element 332, so as to apply a corresponding voltage signal to each sub-electrode 314. Specifically, the switching elements 322 are thin film transistors, the gates of the switching elements 332 in the same row are connected to the same scanning line 333, the drains are connected to the sub-electrodes 314, and the sources of the switching elements 332 in the same column are connected to the same data line 335, so that the number of connecting lines can be greatly reduced.
The liquid crystal display device may further include a control device, wherein the control device is configured to obtain the brightness of each region of the display panel 10, determine a corresponding voltage according to the brightness in the divisional dimming mode, and send a corresponding voltage control signal to the control circuit to control the voltages of the first electrode 312 and the second electrode 322 of the dimmer 30.
The liquid crystal display device further includes a touch control component and a control device, the control device is further connected to the touch control component and the control circuit, when a certain area of the touch control component is touched, the control device processes the touched position information and sends a corresponding voltage control signal to the control circuit, so as to control the voltage of the first electrode 312 and the second electrode 322 of the dimmer 30. When the wide and narrow viewing angle partition display is needed, the corresponding area is selected through the touch control assembly to carry out narrow viewing angle mode display, and the other areas are carried out wide viewing angle mode display. Of course, the touch control component can also be used for selecting the corresponding area to perform wide view angle mode display, and the other areas to perform narrow view angle mode display. Of course, the touch component can be replaced by a mouse or a keyboard.
The liquid crystal display device also comprises a mode switching key used for a user to send a mode switching request signal to the liquid crystal display device. The mode switching key can be a solid key, and the mode switching key can be arranged on the shell of the liquid crystal display device at the moment so as to be convenient for a user to send a mode switching request signal to the liquid crystal display device in a touch and press mode and the like; the mode switching key can also be controlled by software or an application program (APP) to realize the mode switching function, and the virtual key can be displayed on a display screen of the liquid crystal display device during software control. When the liquid crystal display device needs wide and narrow visual angle partition display, a wide and narrow visual angle key in the mode switching key can be pressed to prompt the selection of the area, and corresponding wide and narrow visual angle display is carried out according to the area selected by the touch control assembly; when the zonal dimming is required, the zonal dimming button can be pressed, and the liquid crystal display device performs control and adjustment according to the brightness of different areas of the display panel 10; when the double-view field display is needed, the double-view field key can be pressed, and the liquid crystal display device displays in a double-view field mode.
In the present liquid crystal display device, when a wide viewing angle display mode needs to be implemented, a voltage difference between the first electrode 312 and the second electrode 322 is greater than or equal to a first preset value, preferably, the first preset value is 5V, and at this time, liquid crystal molecules of the second liquid crystal layer 306 do not tilt, so as to implement wide viewing angle display. It should be noted that, the liquid crystal molecules in the second liquid crystal layer 306 are deflected in a part of the period of time in one cycle, so that the state of the liquid crystal molecules can be active to prepare for the deflection in the next period of time, but the deflection of the liquid crystal molecules is very slight and does not affect the display of the wide viewing angle image of the liquid crystal display device. When the narrow viewing angle display mode needs to be implemented, the voltage difference between the first electrode 312 and the second electrode 322 is smaller than the first preset value and is greater than or equal to a second preset value, and the second preset value is smaller than the first preset value, preferably, the voltage difference between the first electrode 312 and the second electrode 322 may be 2.5V, and at this time, the liquid crystal molecules of the second liquid crystal layer 306 deflect, so that the large viewing angle light receiving is implemented, and the narrow viewing angle display is implemented. When the divisional dimming is required, a voltage (for example, 5V) greater than or equal to a first preset value is applied between the first electrode 312 and the second electrode 322 corresponding to the bright-state area of the liquid crystal display device, a voltage (for example, 0V or 0.2V) less than or equal to a third preset value is applied between the first electrode 312 and the second electrode 322 corresponding to the dark-state area, and the third preset value is less than the first preset value and the second preset value, so that the bright area of the liquid crystal display device is brighter, the dark area is darker, the divisional dimming function (i.e., the local dimming) is realized, and the contrast of the liquid crystal display device is improved. When the wide and narrow viewing angle display mode of a certain local region needs to be switched, voltages corresponding to the wide and narrow viewing angle display mode are applied to the first electrode 312 and the second electrode 322 corresponding to the local region. When the Dual View function is required, applying a voltage (for example, 5V) greater than or equal to a first preset value between the first electrode 312 and the second electrode 322 corresponding to the first region 100 of the liquid crystal display device, applying a voltage (for example, 0V or 0.2V) less than or equal to a third preset value between the first electrode 312 and the second electrode 322 corresponding to the second region 101, where the third preset value is less than the first preset value and the second preset value, please refer to fig. 4, where the plurality of first regions 100 and the plurality of second regions 101 are distributed at intervals along the horizontal direction, so that the second region 101 is in a dark state, and the corresponding pixel region of the display panel 10 is shielded, and the pixel region of the display panel 10 includes a first pixel region forming a first image and a second pixel region forming a second image, and light rays of the first pixel region and the second pixel region respectively exit from the first region 100 in a bright state to the left and right sides, so that users respectively seeing the left and right fields respectively see the first image and the second image, and form a Dual View mode (Dual View mode); when the same voltage is applied between the first electrode 312 and the second electrode 322 corresponding to the first region 100 and the second region 101, a single View mode (One View) is formed. It is understood that the first area 100 and the second area 101 may be spaced apart in the vertical direction. Specifically, in order that the width of the first electrode 312 may be designed to be relatively small, it is preferable that the pixel regions are arranged laterally, i.e., the left-right dimension of each pixel region is larger than the up-down dimension. Specifically, in the present embodiment, the sum of the widths of the adjacent first and second regions 100 and 101 is 1.5 to 2.5 times the width P of one pixel region of the display panel 10.
Specifically, in an embodiment, fig. 5 is a voltage waveform diagram of the first electrode and the second electrode of the lcd shown in fig. 1 in the wide viewing angle mode and the narrow viewing angle mode; fig. 6 is a voltage waveform diagram of the first electrode and the second electrode in the divisional dimming mode of the liquid crystal display device shown in fig. 1; FIG. 7 is a voltage-luminance graph of the LCD device shown in FIG. 1; fig. 8 is a voltage waveform diagram of the first electrode and the second electrode in the single view field and the dual view field modes of the liquid crystal display device shown in fig. 1. Referring to fig. 5, when the wide viewing angle display mode needs to be implemented, an ac voltage with an amplitude of 5V is applied to the first electrode 312, a voltage with a waveform of 0V is applied to the second electrode 332, and when the narrow viewing angle display mode needs to be implemented, an ac voltage with an amplitude of 2.5V is applied to the first electrode 312, a voltage with a waveform of 0V is applied to the second electrode 332, the waveform may be a trapezoidal waveform, and a time of a half cycle of the voltage applied to the first electrode 312 is substantially equal to a time of one frame of a frame of the lcd device.
Referring to fig. 6, when the divisional Dimming is required, the ac voltage with a trapezoidal waveform is applied to the first electrodes 312, for the bright state area, the amplitude of the voltage corresponding to the first electrodes 312 is 5V, for the dark state area, the amplitude of the voltage corresponding to the first electrodes 312 is 0.2V, and the voltage of the second electrodes 322 is always 0V, that is, the amplitude of the voltage of the first electrodes 312 is adjusted according to the brightness of the corresponding area of the display panel 10, when the brightness of a certain area of the display panel 10 is brighter, the amplitude of the voltage of the first electrodes 312 is larger, and when the brightness of a certain area of the display panel 10 is darker, the amplitude of the voltage of the first electrodes 312 is smaller, so as to implement the Dimming of the certain area (i.e., local Dimming). In the process of dimming, as shown in fig. 7, when the amplitude of the voltage of the first electrode 312 is larger, the brightness of the liquid crystal display device is brighter, and when the amplitude of the voltage of the first electrode 312 is smaller, the brightness of the liquid crystal display device is also darker, so that by controlling the voltage, the bright area of the display panel 10 is brighter, the dark area is darker, and the contrast of the liquid crystal display device is improved. Referring to fig. 8, when the field of view needs to be switched, an ac voltage with a trapezoidal waveform is applied to the first electrodes 312, the amplitude of the voltage corresponding to the first electrodes 312 is 5V for the first region 100, the amplitude of the voltage corresponding to the first electrodes 312 is 0.2V for the second region 101, and the voltage of the second electrodes 322 is always 0V, so that the second liquid crystal 3064 corresponding to the first region 100 absorbs less light, and the second liquid crystal 3064 corresponding to the second region 101 absorbs more light, thereby implementing a dual field of view mode.
Fig. 9a is a simulation diagram of full-view optical transmittance measurement of the backlight module of the lcd device shown in fig. 1, and fig. 9b to 9d are simulation diagrams of transmittance of the lcd device shown in fig. 1 under different voltages. FIG. 9b is a simulation diagram of the full-view optical transmittance measurement of the liquid crystal display device shown in FIG. 1 when the voltage of the first electrode 312 is 0V. Fig. 9c is a simulation diagram of the full-view optical transmittance measurement of the lcd device shown in fig. 1 when the voltage of the first electrode 312 is 2.5V. FIG. 9d is a simulation diagram of the full-view optical transmittance measurement of the liquid crystal display device shown in FIG. 1 when the voltage of the first electrode 312 is 5V.
In the liquid crystal display device, the lower common electrode and the pixel electrode are divided into a plurality of blocks, so that the liquid crystal display device can realize the regional control of the pressure difference between the pixel electrode and the upper common electrode and the regional control of wide and narrow visual angle display; in addition, the differential pressure between the lower common electrode and the pixel electrode can also realize regional control, thereby realizing regional Dimming (namely local Dimming), improving the contrast of the liquid crystal display device and improving the display effect of the liquid crystal display device; meanwhile, the performance of the second liquid crystal for absorbing light can be utilized to realize the switching between the single view field and the double view field.
Second embodiment
The present invention also provides a driving method of a liquid crystal display device for driving the liquid crystal display device, in one embodiment, the driving method of the liquid crystal display device includes the following steps:
s11, applying a voltage (e.g., 5V) with a voltage difference greater than or equal to a first preset value between the first electrode 312 and the second electrode 322 to implement wide viewing angle display; applying a voltage (e.g., 2.5V) with a voltage difference smaller than a first preset value and greater than or equal to a second preset value between the first electrode 312 and the second electrode 322 to realize narrow viewing angle display; or, a voltage (e.g., 5V) greater than or equal to the first preset value is applied between the first electrode 312 and the second electrode 322 corresponding to the bright state area of the liquid crystal display device, and a voltage (e.g., 2.5V) less than or equal to the third preset value is applied between the first electrode 312 and the second electrode 322 corresponding to the dark state area, so as to implement the zone dimming function; alternatively, a voltage (e.g., 5V) greater than or equal to a first preset value is applied between the first electrode 312 and the second electrode 322 corresponding to the first region 100 of the liquid crystal display device, a voltage (e.g., 0V or 0.2V) less than or equal to a third preset value is applied between the first electrode 312 and the second electrode 322 corresponding to the second region 101, the third preset value is less than the first preset value and the second preset value, and the plurality of first regions 100 and the plurality of second regions 101 are distributed at intervals along the horizontal direction or the vertical direction, so that the dual-field mode is implemented.
Specifically, when the wide viewing angle display mode needs to be implemented, an ac voltage having an amplitude of 5V is applied to the first electrode 312, a voltage of 0V is applied to the second electrode 332, and the waveform may be a trapezoidal wave, and when the narrow viewing angle display mode needs to be implemented, an ac voltage having an amplitude of 2.5V is applied to the first electrode 312, a voltage of 0V is applied to the second electrode 332, and a waveform may be a trapezoidal wave, and a time of a half cycle of the voltage applied to the first electrode 312 is substantially equal to a time of one frame of a screen of the liquid crystal display device. When the divisional dimming is required, an alternating voltage with a trapezoidal waveform is applied to the first electrodes 312, the amplitude of the voltage corresponding to the first electrodes 312 is 5V for a bright state region, the amplitude of the voltage corresponding to the first electrodes 312 is 0.2V for a dark state region, and the voltage of the second electrodes 322 is always 0V. When the field of view needs to be switched, an ac voltage with a trapezoidal waveform is applied to the first electrodes 312, the amplitude of the voltage corresponding to the first electrodes 312 is 5V for the first region 100, the amplitude of the voltage corresponding to the first electrodes 312 is 0.2V for the second region 101, and the voltage of the second electrodes 322 is always 0V.
The liquid crystal display device driving method further includes the steps of:
s13, in the divisional dimming mode, the brightness of each region of the display panel 10 is obtained, and the voltage difference between the first electrode 312 and the second electrode 322 at the corresponding position is determined according to the brightness of each region, so as to control the voltages of the first electrode 312 and the second electrode 322 of the dimmer 30.
The liquid crystal display device driving method further includes the steps of:
a voltage (for example, 5V) with a voltage difference larger than or equal to a first preset value is applied between a part of the first electrodes 312 and the second electrodes 322, and a voltage (for example, 2.5V) with a voltage difference smaller than the first preset value and larger than or equal to a second preset value is applied between the rest of the first electrodes 312 and the second electrodes 322, so that wide and narrow viewing angle split display is realized.
By the driving method of the liquid crystal display device, the liquid crystal display device can realize the regional control of the pressure difference between the pixel electrode and the upper common electrode, and realize the regional control of wide and narrow visual angle display; in addition, the differential pressure between the lower common electrode and the pixel electrode can also realize regional control, thereby realizing regional Dimming (namely local Dimming), improving the contrast of the liquid crystal display device and improving the display effect of the liquid crystal display device; meanwhile, the performance of the second liquid crystal for absorbing light can be utilized to realize the switching between the single view field and the double view field.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A liquid crystal display device, comprising a display panel (10) and a light modulator (30), wherein the light modulator (30) is disposed on one side of the display panel (10), the light modulator (30) comprises a third substrate (302), a fourth substrate (304) and a second liquid crystal layer (306) disposed between the third substrate (302) and the fourth substrate (304), the second liquid crystal layer (306) comprises a first liquid crystal (3062) and a second liquid crystal (3064), liquid crystal molecules of the second liquid crystal (3064) absorb a large amount of light in the absence of an electric field, and the absorption rate of the light is reduced under the action of the electric field, the third substrate (302) comprises a third substrate (308) and a first electrode (312), the first electrode (312) is disposed on the third substrate (308), the first electrode (312) is divided into a plurality of sub-electrodes (314), the fourth substrate (304) comprises a fourth substrate (320) and a second electrode (322), and the second electrode (322) is disposed on the fourth substrate (320).
2. The lcd device of claim 1, wherein the third substrate (302) further comprises a first insulating layer (316), the first insulating layer (316) being disposed on a side of the first electrode (312) facing the fourth substrate (304); alternatively, the fourth substrate (304) further comprises a first insulating layer (316), and the first insulating layer (316) is disposed on a side of the second electrode (322) facing the third substrate (302).
3. A liquid crystal display device as claimed in claim 1, characterized in that the second liquid crystal (3064) is a black dye liquid crystal.
4. The lcd apparatus of claim 1, further comprising a backlight module (70), wherein the backlight module (70) is disposed on a side of the display panel (10) away from the light modulator (30).
5. The liquid crystal display device according to claim 1, wherein one or more of the sub-electrodes (314) are connected to a first connection line (330) for electrically connecting each of the sub-electrodes (314) to an external circuit, the liquid crystal display device further comprising a control circuit, the first connection line (330) being electrically connected to the control circuit; alternatively, the liquid crystal display device further comprises a control circuit, and each sub-electrode (314) is electrically connected or disconnected with the control circuit through a switch element (332), so that a corresponding voltage signal is applied to each sub-electrode (314).
6. The LCD device as claimed in claim 5, further comprising a control device for obtaining brightness of each region of the display panel (10), determining a corresponding voltage according to the brightness in a divisional dimming mode, and sending a corresponding voltage control signal to the control circuit to control the voltages of the first electrode (312) and the second electrode (322) of the dimmer (30).
7. The liquid crystal display device of claim 1, wherein the liquid crystal display device comprises a wide viewing angle mode, a narrow viewing angle mode, a wide and narrow viewing angle partition mode, a partition dimming mode, a dual field of view mode; when the liquid crystal display device is in a wide viewing angle mode, applying a voltage with a voltage difference larger than or equal to a first preset value between the first electrode (312) and the second electrode (322); when the liquid crystal display device is in a narrow viewing angle mode, applying a voltage with a voltage difference smaller than the first preset value and larger than or equal to a second preset value which is smaller than the first preset value to the first electrode (312) and the second electrode (322); when the liquid crystal display device is in a wide and narrow viewing angle partition mode, applying a voltage with a voltage difference larger than or equal to the first preset value between a part of the first electrodes (312) and the second electrodes (322), and applying a voltage with a voltage difference smaller than the first preset value and larger than or equal to the second preset value between the rest of the first electrodes (312) and the second electrodes (322); when the liquid crystal display device is in the zone dimming mode, applying a voltage which is greater than or equal to the first preset value between the first electrode (312) and the second electrode (322) corresponding to a bright-state area of the liquid crystal display device, and applying a voltage which is less than or equal to a third preset value between the first electrode (312) and the second electrode (322) corresponding to a dark-state area, wherein the third preset value is less than the first preset value and the second preset value; when the liquid crystal display device is in a dual-view mode, a voltage larger than or equal to the first preset value is applied between the first electrode (312) and the second electrode (322) corresponding to a first area (100) of the liquid crystal display device, a voltage smaller than or equal to the third preset value is applied between the first electrode (312) and the second electrode (322) corresponding to a second area (101), and a plurality of first areas (100) and a plurality of second areas (101) are distributed at intervals.
8. The lcd device of claim 1, further comprising a first polarizer (52), a second polarizer (54), and a third polarizer (56), wherein the first polarizer (52) is located on a side of the display panel (10) away from the light modulator (30), the second polarizer (54) is located between the display panel (10) and the light modulator (30), the third polarizer (56) is located on a side of the light modulator (30) away from the display panel (10), a polarization direction of the third polarizer (56) is parallel to a polarization direction of the second polarizer (54), and a polarization direction of the first polarizer (52) is perpendicular to polarization directions of the third polarizer (56) and the second polarizer (54).
9. A driving method for driving the liquid crystal display device according to any one of claims 1 to 8, comprising:
applying a voltage with a voltage difference larger than or equal to a first preset value between the first electrode (312) and the second electrode (322) to realize wide-view display; applying a voltage with a voltage difference smaller than the first preset value and larger than or equal to a second preset value to the first electrode (312) and the second electrode (322) to realize narrow-view-angle display, wherein the second preset value is smaller than the first preset value; or, a voltage which is larger than or equal to a first preset value is applied between the first electrode (312) and the second electrode (322) corresponding to a bright state area of the liquid crystal display device, a voltage which is smaller than or equal to a third preset value is applied between the first electrode (312) and the second electrode (322) corresponding to a dark state area, and a partition dimming mode is realized, wherein the third preset value is smaller than the first preset value; or, the liquid crystal display device comprises a plurality of first areas (100) and a plurality of second areas (101), the plurality of first areas (100) and the plurality of second areas (101) are distributed at intervals, a voltage which is larger than or equal to a first preset value is applied between the first electrode (312) and the second electrode (322) corresponding to the first areas (100) of the liquid crystal display device, a voltage which is smaller than or equal to a third preset value is applied between the first electrode (312) and the second electrode (322) corresponding to the second areas (101), the third preset value is smaller than the first preset value, and the plurality of first areas (100) and the plurality of second areas (101) are distributed at intervals along the horizontal direction or the vertical direction, so that the dual-field mode is realized.
10. The driving method of the liquid crystal display device according to claim 9, wherein in the divisional dimming mode, the brightness of each area of the display panel (10) is obtained, and the voltage difference between the first electrode (312) and the second electrode (322) at the corresponding position is determined according to the brightness of each area, thereby controlling the voltages of the first electrode (312) and the second electrode (322) of the dimmer (30); alternatively, the first and second electrodes may be,
and applying a voltage with a voltage difference larger than or equal to the first preset value between part of the first electrodes (312) and the second electrodes (322), and applying a voltage with a voltage difference smaller than the first preset value and larger than or equal to the second preset value between the rest of the first electrodes (312) and the second electrodes (322), so that wide-narrow view angle split area display is realized.
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