CN106646936B - Visual angle changeable liquid crystal display device and driving method - Google Patents
Visual angle changeable liquid crystal display device and driving method Download PDFInfo
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- CN106646936B CN106646936B CN201610948902.7A CN201610948902A CN106646936B CN 106646936 B CN106646936 B CN 106646936B CN 201610948902 A CN201610948902 A CN 201610948902A CN 106646936 B CN106646936 B CN 106646936B
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
Abstract
A kind of liquid crystal display device and driving method that visual angle is changeable, wherein the liquid crystal display device includes display panel, the display panel includes first substrate, the second substrate being oppositely arranged with the first substrate and the liquid crystal layer between the first substrate and the second substrate, the first substrate is equipped with viewing angle control electrode, the viewing angle control electrode switches between wide viewing angle mode and narrow viewing angle mode for controlling the display panel, it is limited in the second substrate by scan line and data line and forms multiple sub-pixels, the second substrate is equipped with pixel electrode in each sub-pixel, public electrode is additionally provided in the second substrate, the viewing angle control electrode includes mutually insulated multiple viewing angle control electrode strips spaced apart, each viewing angle control electrode strip along be parallel to scan line direction extend and it is corresponding with a line sub-pixel.Liquid crystal display device and driving method provided in this embodiment can be effectively improved Mura problem in ghost and face, image quality made to get a promotion.
Description
Technical field
The present invention relates to the technical field of liquid crystal display, a kind of can be switched more particularly to visual angle liquid crystal display device and
Driving method.
Background technique
Liquid crystal display device (liquid crystal dilay, LCD) has good, small in size, light-weight, the low driving of image quality
Voltage, low-power consumption, radiationless and relatively low manufacturing cost advantage, occupy an leading position in flat display field.
Present liquid crystal display device gradually develops towards wide viewing angle direction, such as uses in-plane-switching mode (IPS) or edge
Wider visual angle may be implemented in the liquid crystal display device of field switch mode (FFS).However, today's society people increasingly focus on
The privacy for protecting oneself has many things and does not like to take out and shares with people.In public, always wish that oneself is seeing the mobile phone
Or content is secrecy when browsing computer.Therefore, the display of single visual angle mode is no longer satisfied user's
Demand.Other than the demand of wide viewing angle, under the occasion for needing peep-proof, it is also desirable to can display device be switched or be adjusted
To narrow viewing angle mode.
In order to realize the width view angle switch of liquid crystal display device, a kind of mode is to utilize colored filter substrate side
Viewing angle control electrode give liquid crystal molecule apply a vertical electric field, to realize narrow viewing angle mode.It please join Fig. 1 and Fig. 2, liquid crystal
Showing device includes first substrate 11, the second substrate 12 and the liquid crystal layer 13 between first substrate 11 and the second substrate 12, and
One substrate 11 is colored filter substrate, and the second substrate 12 is thin-film transistor array base-plate, and wherein first substrate 11 is equipped with
Viewing angle control electrode 111, the second substrate 12 are equipped with pixel electrode (not shown) and public electrode (not shown).
As shown in Figure 1, the viewing angle control electrode 111 of first substrate 11 applies and common electrical when needing wide viewing angle to show
Extremely identical voltage makes the potential difference zero between viewing angle control electrode 111 and the public electrode of the second substrate 12, liquid crystal display
Realize that wide viewing angle is shown under face internal electric field of the device between pixel electrode and public electrode.
As shown in Fig. 2, the viewing angle control electrode 111 of first substrate 11 applies and common electrical when needing narrow viewing angle to show
Extremely different voltage, makes between viewing angle control electrode 111 and the public electrode of the second substrate 12 that there are certain potential differences, at this time
A vertical direction electric field (as shown in arrow E in figure) is generated between first substrate 11 and the second substrate 12, in liquid crystal layer 13
Face internal electric field of the liquid crystal molecule between pixel electrode and public electrode under while rotate horizontally, can be because of vertical direction electricity
And tilt and tilt, this characteristic of liquid crystal can make to occur when black state wide-angle observation light leakage, and liquid crystal display device is made to exist
Big view directions contrast reduces, final to realize that narrow viewing angle is shown.
As shown in figure 3, added voltage is generally periodically handed on viewing angle control electrode 111 in narrow viewing angle display
Galvanic electricity pressure, added voltage is direct current common voltage (i.e. DC Vcom), the alternating current of viewing angle control electrode 111 on public electrode
Pressure fluctuates up and down around the direct current common voltage of public electrode, the alternating current being applied on viewing angle control electrode 111 as shown in the figure
Pressure is sine wave and its frequency is identical as frame frequency (i.e. the frame frequency) of liquid crystal display device, that is, liquid crystal display fills
Set every refreshing 1 frame (frame) picture, on viewing angle control electrode 111 added alternating voltage equally refresh a cycle and with every frame
The refreshing of picture keeps synchronizing.
For liquid crystal display device when narrow viewing angle is shown, the voltage of pixel electrode can be by viewing angle control electrode in each sub-pixel
111 alternating voltage coupling, causes the voltage of the voltage of pixel electrode after charging to be kept for the stage change, with △ Vp_cf
Indicate the alternating voltage of viewing angle control electrode 111 to voltage deviation caused by pixel electrode coupling.Due to viewing angle control electrode
Added voltage is alternating voltage on 111, and the voltage swing on different moments, viewing angle control electrode 111 is different, to difference
Pixel electrode voltage deviation △ Vp_cf caused by capable sub-pixel couples is also different, i.e. different positions of the △ Vp_cf in panel
It is different for setting.By taking alternating voltage amplitude added on viewing angle control electrode 111 is +/- 5V as an example, due to viewing angle control electrode
The fluctuation range of △ Vp_cf different location in face caused by 111 alternating voltage changes is 0V~0.5V or so.And in face not
Same △ Vp_cf is the reason of causing ghost seriously to occur with display uneven (Mura).
Summary of the invention
The purpose of the present invention is to provide liquid crystal display devices and driving method that a kind of visual angle can be switched, to realize not
With the width view angle switch of occasion, and improves and show uneven (Mura) problem in ghost and face.
The present invention provides a kind of visual angle changeable liquid crystal display device, including display panel, which includes the
The second substrate that one substrate and the first substrate are oppositely arranged and the liquid crystal between the first substrate and the second substrate
Layer, the first substrate are equipped with viewing angle control electrode, and the viewing angle control electrode is for controlling the display panel in wide viewing angle mode
Switch between narrow viewing angle mode, is limited in the second substrate by scan line and data line and form multiple sub-pixels, second base
Plate is equipped with pixel electrode in each sub-pixel, is additionally provided with public electrode in the second substrate, which includes phase
Multiple viewing angle control electrode strips that mutual insulation gap is opened, each viewing angle control electrode strip extend along the direction for being parallel to scan line
And it is corresponding with a line sub-pixel.
Further, interval forms slit between adjacent viewing angle control electrode strip, and the slit is parallel with scan line and phase
It is corresponding.
Further, it is additionally provided with black matrix on the first substrate, the slit is corresponding with the black matrix and the slit is less than
The line width of the black matrix.
Further, the quantity of multiple viewing angle control electrode strip is identical as the line number of sub-pixel, makes every a line sub-pixel
Covered by a corresponding viewing angle control electrode strip.
Further, which further includes an at least driving chip, multiple viewing angle control electrode strip difference
By cabling, at least a driving chip is electrically connected with this.
Further, which is equipped with view angle switch key, for sending out for user to the liquid crystal display device
View angle switch signal out.
The present invention also provides a kind of driving methods of liquid crystal display device, the liquid crystal for driving above-mentioned visual angle changeable
Display device, the driving method include:
Apply unified periodic alternating voltage respectively to multiple viewing angle control electrode strips of the viewing angle control electrode；
When a scan line is opened, it is connected by each data line outputting data signals pair with this scan line
A line sub-pixel charges, and the voltage signal of that viewing angle control electrode strip corresponding with the row sub-pixel is switched
It is identical as the direct current common voltage of the public electrode；
When this scan line is closed, by the electricity of that viewing angle control electrode strip corresponding with the row sub-pixel
Pressure signal is restored to original periodic alternating voltage.
Further, the liquid crystal molecule in the liquid crystal layer is positive liquid crystal molecules, to multiple views of the viewing angle control electrode
When angle coordination electrode item applies the periodic alternating voltage respectively, which is in narrow viewing angle mode.
Further, the liquid crystal molecule in the liquid crystal layer is negative liquid crystal molecule, to multiple views of the viewing angle control electrode
When angle coordination electrode item applies the periodic alternating voltage respectively, which is in wide viewing angle mode.
Further, which fluctuates up and down around the direct current common voltage.
Visual angle provided in an embodiment of the present invention changeable liquid crystal display device and driving method, by the way that viewing angle control is electric
Multiple viewing angle control electrode strips that pole is set as pattern structure and is spaced apart including mutually insulated, make each viewing angle control electrode
Item can apply voltage signal respectively.When a scan line is opened, pass through each data line pair and this scan line phase
A line sub-pixel even charges, and by the voltage signal of that viewing angle control electrode strip corresponding with the row sub-pixel
Be switched to it is identical as the direct current common voltage of public electrode, can make every row sub-pixel charging when, corresponding viewing angle control
Voltage on electrode strip is equal, as DC Vcom.So while the alternating voltage of each viewing angle control electrode strip is to pixel electricity
Voltage change caused by pole couples is consistent in face, can be effectively improved Mura problem in ghost and face, be obtained image quality
To promotion.The present embodiment can realize the light switching between wide viewing angle and narrow viewing angle in different occasions, have stronger operation spirit
Activity and convenience reach the Multifunctional liquid crystal display device for integrating entertainment video and privacy secrecy.
Detailed description of the invention
Fig. 1 is structural schematic diagram of one of liquid crystal display device in wide viewing angle.
Fig. 2 is structural schematic diagram of the liquid crystal display device in narrow viewing angle in Fig. 1.
Fig. 3 is the voltage waveform view being applied in Fig. 2 in narrow viewing angle on viewing angle control electrode.
Fig. 4 is the electrical block diagram of liquid crystal display device in first embodiment of the invention.
Fig. 5 is liquid crystal display device in Fig. 4 along the schematic cross-section of V-V line.
Fig. 6 is structural schematic diagram of the liquid crystal display device in narrow viewing angle in Fig. 5.
Fig. 7 is the planar structure schematic diagram of the viewing angle control electrode of liquid crystal display device in Fig. 4.
Fig. 8 is that liquid crystal display device is applied to the alternating voltage schematic diagram on viewing angle control electrode strip in Fig. 4.
Fig. 9 a to Fig. 9 b is the planar structure schematic diagram of liquid crystal display device in Fig. 4.
Figure 10 is the working sequence schematic diagram of liquid crystal display device in Fig. 4.
Figure 11 is schematic cross-section of the liquid crystal display device in narrow viewing angle in second embodiment of the invention.
Figure 12 is schematic cross-section of the liquid crystal display device in wide viewing angle in Figure 11.
Specific embodiment
It is of the invention to reach the technical approach and effect that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Accompanying drawings and embodiments, to a specific embodiment of the invention, structure, feature and its effect, detailed description is as follows.
[first embodiment]
Fig. 4 is the electrical block diagram of liquid crystal display device in first embodiment of the invention, and Fig. 5 is liquid crystal in Fig. 4
For showing device along the schematic cross-section of V-V line, Fig. 6 is structural schematic diagram of the liquid crystal display device in narrow viewing angle in Fig. 5, Fig. 7
For the planar structure schematic diagram of the viewing angle control electrode of liquid crystal display device in Fig. 4, Fig. 4 to Fig. 7, the liquid in the present embodiment please be join
Crystal device includes display panel 20, which includes first substrate 21, be oppositely arranged with first substrate 21 the
Two substrates 22 and the liquid crystal layer 23 between first substrate 21 and the second substrate 22.Wherein, first substrate 21 is colorized optical filtering
Plate base, the second substrate 22 are thin-film transistor array base-plate.
Under normal circumstances, when screen of the user from different visual angle viewing liquid crystal display devices, the contrast meeting of image
Reduce with the increase at visual angle.The liquid crystal display device of traditional twisted nematic (Twisted Nematic, TN), it is public
Electrode and pixel electrode are respectively formed on upper and lower two different substrates, and liquid crystal molecule is in a plane vertical with substrate
Rotation.However, the visual angle of TN type liquid crystal display device is narrow.To realize wide viewing angle, changed using the in-plane of horizontal component of electric field
Type (In-Plane Switching, IPS) and fringe field switch type (the Fringe Field for using fringe field
Switching, FFS) liquid crystal display device just become the market mainstream.It is public for IPS type or the liquid crystal display device of FFS type
Common electrode and pixel electrode are formed on same substrate (i.e. thin-film transistor array base-plate), liquid crystal molecule with substrate substantially
Parallel plane internal rotation is to obtain wider array of visual angle.
Liquid crystal display device provided in this embodiment is suitable for plane inner switching type (IPS), fringe field switch type (FFS)
The liquid crystal display device of isotype, public electrode and pixel electrode are both formed in same substrate (i.e. thin-film transistor array base-plate)
On, when applying the electric field of display between public electrode and pixel electrode, liquid crystal molecule is in the plane substantially parallel with substrate
Interior rotation is to obtain wider visual angle.In the present embodiment, by taking fringe field switch type (FFS) as an example to the liquid crystal display device into
Row explanation.
First substrate 21 is equipped with color blocking layer 212, black matrix (BM) 213, viewing angle control electricity in the side towards liquid crystal layer 23
Pole 214 and flatness layer 215.Color blocking layer 212 and black matrix 213 are formed in surface of the first substrate 21 towards 23 side of liquid crystal layer
On, color blocking material of the color blocking layer 212 for example including red (R), green (G), blue (B).Viewing angle control electrode 214 is formed in color
In resistance layer 212 and black matrix 213, switch between wide viewing angle mode and narrow viewing angle mode for controlling the display panel 20.Visual angle
Coordination electrode 214 includes multiple viewing angle control electrode strip 214a that mutually insulated is spaced apart.Flatness layer 215 is covered on viewing angle control
On electrode 214.It should be appreciated that the film layer structure and sequence on first substrate 21 are without being limited thereto, it can according to need and be adjusted.
The second substrate 22 is equipped with scan line 222, data line 223, thin film transistor (TFT) (TFT) in the side towards liquid crystal layer 23
224, the first insulating layer 225, public electrode 226 (common electrode), second insulating layer 227 and pixel electrode 228
(pixel electrode).It should be appreciated that only illustrating and the present invention on first substrate 21 and the second substrate 22 in the present embodiment
Relevant film layer structure omits incoherent film layer structure.
As shown in figure 4, intersected with multiple data lines 223 in the second substrate 22 by multi-strip scanning line 222 limit formed it is multiple
Sub-pixel (sub-pixel), multiple sub-pixel are arranged in array into multirow and multiple row.Sub-pixel is, for example, red (R), green
(G) or blue (B) sub-pixel, multiple adjacent sub-pixels constitute a display pixels (pixel), such as a display pixel can
Including red (R), green (G) and blue (B) three sub-pixels.Pixel electrode 228 and film crystal are equipped in each sub-pixel
(TFT) 224 is managed, thin film transistor (TFT) 224 is located near scan line 222 and 223 crossover location of data line.Each thin film transistor (TFT)
224 include grid, source electrode and drain electrode (figure is not marked), and wherein grid is electrically connected corresponding scan line 222, and source electrode electrical connection is corresponding
Data line 223, drain electrode are electrically connected corresponding pixel electrode 228.
In the present embodiment, pixel electrode 228 is located at 226 top of public electrode, i.e., pixel electrode 228 is compared to public electrode
226, closer to liquid crystal layer 23, are equipped at intervals with second insulating layer 227 between pixel electrode 228 and public electrode 226, but are not limited to
This.In other embodiments, pixel electrode 228 can also be located at 226 lower section of public electrode.In addition, working as the liquid crystal display device
When using plane inner switching type (IPS) mode, public electrode 226 and pixel electrode 228 be may be located in same layer, public at this time
Common electrode 226 and pixel electrode 228 can be respectively prepared the structure with multiple electrodes item and be mutually inserted cooperation.
Viewing angle control electrode 214, public electrode 226 and pixel electrode 228 can use ITO (tin indium oxide), IZO (oxygen
Change indium zinc) etc. electrically conducting transparents material be made.
Viewing angle control electrode 214 on first substrate 21 is the pattern structure of horizontal stripe shape, and viewing angle control electrode 214 includes
Mutually insulated multiple viewing angle control electrode strip 214a spaced apart, each viewing angle control electrode strip 214a are along being parallel to scan line
222 direction extends and corresponding with a line sub-pixel.In the present embodiment, the quantity of multiple viewing angle control electrode strip 214a with
The line number of sub-pixel is identical in panel, covers every a line sub-pixel (such as by a corresponding viewing angle control electrode strip 214a
Shown in Fig. 4).The length of each viewing angle control electrode strip 214a can be greater than display panel 20 across entire display panel 20
Effective display area (i.e. Active Area) width.
Interval forms slit 214b between adjacent viewing angle control electrode strip 214a, and slit 214b is parallel with scan line 222
And it is corresponding.Moreover, slit 214b is corresponding with black matrix 213 and slit 214b is less than the line width of black matrix 213, make each view
The two sides of angle coordination electrode 214a are covered in black matrix 213 (as shown in Figure 5).
As shown in fig. 7, the liquid crystal display device, which further comprises an at least driving chip 30, (only illustrates a drive in figure
Dynamic chip 30, but not limited to this, the quantity of driving chip 30 can be multiple), multiple viewing angle control electrode strip 214a difference
By cabling 31, at least a driving chip 30 is electrically connected with this.Due to mutually insulated between these viewing angle control electrode strips 214a,
Therefore voltage signal can be applied to these viewing angle control electrode strips 214a by an at least driving chip 30 respectively.
Liquid crystal molecule is generally divided into positive liquid crystal molecules and negative liquid crystal molecule.Liquid in the present embodiment, in liquid crystal layer 23
Brilliant molecule is positive liquid crystal molecules, and positive liquid crystal molecules, which have, responds fast advantage.In original state, (i.e. display panel 20 is not applied
Add the situation of any voltage) under, the lying posture parallel with substrate 21,22 is presented in the positive liquid crystal molecules in liquid crystal layer 23, just
The long axis direction of property liquid crystal molecule is substantially parallel with the surface of substrate 21,22 (such as Fig. 5).In practical applications, in liquid crystal layer 23
Positive liquid crystal molecules and substrate 21,22 between can have the initial pre-tilt angle of very little, the range of the initial pre-tilt angle can be
More than or equal to 0 degree and it is less than or equal to 5 degree, it may be assumed that 0 θ≤5 ° ≦.
Viewing angle control electrode 214 is regarded between wide viewing angle mode and narrow viewing angle mode for controlling the display panel 20
Angle switching.As shown in Figure 5 and Figure 6, it by applying voltage on each viewing angle control electrode strip 214a, can be controlled at each visual angle
Between electrode strip 214a and public electrode 226 processed generate voltage difference (i.e. bias), make the display panel 20 wide viewing angle mode with
Switch between narrow viewing angle mode.
It please join Fig. 5, when the direct current public voltage signal of application and public electrode 226 on each viewing angle control electrode strip 214a
When (DC Vcom) identical d. c. voltage signal, each viewing angle control electrode strip 214a is identical as the current potential of public electrode 226,
There is no bias between each viewing angle control electrode strip 214a and public electrode 226, there is no vertical electric field between two substrates 21,22
It is formed, it is still lying posture that the tilt angle of the liquid crystal molecule in liquid crystal layer 23, which hardly happens variation, by being located at the second substrate
The face internal electric field driving liquid crystal molecule formed between pixel electrode 228 and public electrode 226 on 22 is parallel with substrate 21,22
Plane internal rotation, liquid crystal molecule is traditional face internal electric field driving method, and wide view is realized under the effect of stronger face internal electric field
Angle mould formula.
Please join Fig. 6, when apply respectively to each viewing angle control electrode strip 214a unified periodic alternating voltage (such as with
For the square wave of Fig. 8) between each viewing angle control electrode strip 214a and public electrode 226 generate bias when, two substrates
21, vertical electric field (as shown in arrow E in figure) is formed between 22, since positive liquid crystal molecules will be along parallel under electric field action
It is rotated in the direction of electric field line, positive liquid crystal molecules will deflect under vertical electric field effect, make liquid crystal molecule and substrate
21, the tilt angle between 22 increases.Since liquid crystal molecule is deflected, so that in the screen strabismus side of the display panel 20
Upwards, there is light leakage phenomena since phase delay and upper down polaroid (not shown) mismatch across the light of liquid crystal molecule,
When the strabismus side from the display panel 20 being caused to look up screen, the contrast on screen reduces and influences viewing effect, makes
Visual angle reduces, to realize narrow viewing angle mode.
Fig. 9 a to Fig. 9 b is the planar structure schematic diagram of liquid crystal display device in Fig. 4, please join Fig. 9 a to Fig. 9 b, the liquid crystal
Showing device is equipped with view angle switch key 50, for issuing view angle switch signal to the liquid crystal display device for user.View angle switch
Key 50 can be physical button (as illustrated in fig. 9), can also be software control or application program (APP) to realize switching function
(visual angle size as shown in figure 9b, can be arranged by slider bar).Under normal circumstances, on each viewing angle control electrode strip 214a
Apply the identical d. c. voltage signal of direct current public voltage signal (DC Vcom) with public electrode 226, each viewing angle control electricity
There is no bias between pole 214a and public electrode 226, there is no vertical electric field to be formed between two substrates 21,22, the liquid crystal
Showing device is under wide viewing angle mode.When having peep-proof demand and need to switch to narrow viewing angle mode, user can pass through operation
The view angle switch key 50 issues view angle switch signal, starts to apply periodically exchange to each viewing angle control electrode strip 214a
Voltage generates bias between each viewing angle control electrode strip 214a and public electrode 226, is formed between two substrates 21,22
Vertical electric field, to switch to narrow viewing angle mode.When not needing narrow viewing angle display, user can be by operating the visual angle again
Switching key 50, to be back to wide viewing angle mode.To the changeable liquid crystal display dress in visual angle provided in an embodiment of the present invention
It sets with stronger operating flexibility and convenience.
Under narrow viewing angle mode, the voltage signal needs being applied on each viewing angle control electrode strip 214a are periodic
Alternating voltage overturns the polarity of voltage of each viewing angle control electrode strip 214a alternately relative to public electrode 226, two such
The vertical electric field direction formed between substrate 21,22 changes back and forth, can polarize to avoid liquid crystal.
In the present embodiment, under narrow viewing angle mode, the periodic friendship that is applied on each viewing angle control electrode strip 214a
Galvanic electricity pressure can be square wave (as shown in Figure 8), but not limited to this, the periodic alternating voltage waveform may be trapezoidal wave,
Sine wave, triangular wave or sawtooth wave etc., in figure only by taking square wave as an example.The periodic alternating voltage is around output to common electrical
Direct current common voltage (DC Vcom) on pole 226 fluctuates up and down.In this respect it is to be noted that either in width in the present embodiment
Under field-of-view mode or narrow viewing angle mode, the voltage applied on public electrode 226 is direct current common voltage (DC Vcom).
In the present embodiment, it is applied to the frequency and display panel 20 of the alternating voltage on each viewing angle control electrode strip 214a
Frame frequency (i.e. frame frequency) it is identical (such as being 60Hz), that is, 1 frame of every refreshing of display panel 20 (frame) draw
Face, the alternating voltage on each viewing angle control electrode strip 214a equally refresh a cycle and keep same with the refreshing of every frame picture
Step.In other embodiments, the frequency of the alternating voltage can also be different from the frame frequency of display panel 20.
Under narrow viewing angle mode, since the voltage signal being applied on each viewing angle control electrode strip 214a is alternating current
Pressure causes the sub-pixel that do not go together in charging as the voltage fluctuation on each viewing angle control electrode strip 214a changes, right
The viewing angle control electrode strip 214a voltage answered is different, and then causes the voltage of pixel electrode 228 in the sub-pixel that do not go together by coupling
The degree of conjunction is different, causes image retention and different (i.e. mura) problems of different zones picture brightness.To improve in ghost and face
Mura is horizontal, in the present embodiment, will be used to control the patterned phase of viewing angle control electrode 214 of view angle switch on first substrate 21
Multiple viewing angle control electrode strip 214a that mutual insulation gap is opened, each viewing angle control electrode strip 214a are along being parallel to scan line
222 direction extends and corresponding with a line sub-pixel respectively, and therefore, each viewing angle control electrode strip 214a can apply respectively
Voltage signal.
In the present embodiment, under narrow viewing angle mode, display panel 20 can be driven in the following way:
Unified periodic alternating current is exported respectively to multiple viewing angle control electrode strip 214a of viewing angle control electrode 214
Pressure, the periodic alternating voltage can be square wave, trapezoidal wave, sine wave, triangular wave or sawtooth wave etc.；
When a scan line 222 is opened, pass through each 223 outputting data signals pair of data line and this scan line
222 connected a line sub-pixels charge, and will that viewing angle control electrode strip 214a corresponding with the row sub-pixel
Voltage signal be switched to it is identical as the direct current common voltage of public electrode 226 (DC Vcom)；
It, will that viewing angle control electrode strip corresponding with the row sub-pixel when this scan line 222 is closed
The voltage signal of 214a is restored to original periodic alternating voltage.
According to above-mentioned driving method, every row sub-pixel can be made in charging, corresponding viewing angle control electrode strip
Voltage on 214a is equal, i.e. DC Vcom.So while the alternating voltage on viewing angle control electrode strip 214a is to pixel electrode
228 couple caused voltage change △ Vp_cf is consistent in face, can be effectively improved Mura in ghost level and face and ask
Topic, makes image quality get a promotion.
In the present embodiment, the liquid crystal molecule in liquid crystal layer 23 is positive liquid crystal molecules, to the more of viewing angle control electrode 214
When a viewing angle control electrode strip 214a exports periodic alternating voltage respectively, which is in narrow viewing angle mode.
As shown in figure 8, the periodic AC voltage exported respectively to multiple viewing angle control electrode strip 214a surrounds common electrical
The direct current common voltage (DC Vcom) of pole 226 fluctuates up and down, in figure only by taking square wave as an example, with high potential VHAnd low potential
VL, but not limited to this, the waveform of the periodic alternating voltage can also be trapezoidal wave, sine wave, triangular wave or sawtooth wave
Deng.
In addition, be also provided with blank time section (blanking time) Tx between two adjacent frame pictures, when blank
Between section Tx be transit time section in consecutive frame picture, the viewing angle control electrode 214 after each end cycle on first substrate 21
Voltage waveform switch in blank time section Tx, in blank time section Tx to viewing angle control electrode 214 export voltage
It can not be required with waveform.
It please join Figure 10, below in conjunction with periodic square wave shown in Fig. 8, there was only the liquid crystal of 4 scan lines (G1~G4)
It elaborates again for showing device to above-mentioned driving method, but the present invention is suitable for any periodic AC voltage waveform,
It is also applied for the liquid crystal display device of any resolution ratio.
Here, 4 scan lines (G1~G4) have been connected respectively four row sub-pixels, it is assumed that corresponding with four row sub-pixels
Four viewing angle control electrode strip 214a be respectively ITO1, ITO2, ITO3, ITO4.
Firstly, being exported respectively to four viewing angle control electrode strips ITO1, ITO2, ITO3, ITO4 of viewing angle control electrode 214
Unified periodic alternating voltage, i.e., square wave shown in Fig. 8；
When scan line is progressively scanned from G1 to G4, by each data line outputting data signals to be scanned
(i.e. voltage becomes VGH) the connected a line sub-pixel of scan line charge, and will it is corresponding with the row sub-pixel that
The voltage of viewing angle control electrode strip is switched to direct current common voltage (that is, DC Vcom), the viewing angle control electrode strip of remaining position
Still apply set periodic alternating voltage (square wave i.e. shown in Fig. 8)；
When every scan line is pent, by that viewing angle control electrode strip corresponding with the row sub-pixel
Voltage is restored to original periodic alternating voltage (square wave i.e. shown in Fig. 8).
Specifically, it when scan line G1 is scanned, charges to the first row sub-pixel being connected with scan line G1,
And the voltage of first piece viewing angle control electrode strip ITO1 corresponding with the first row sub-pixel is switched to direct current common voltage (i.e.
DC Vcom)；It, will first viewing angle control electrode strip corresponding with the first row sub-pixel when line G1 to be scanned is pent
The voltage of ITO1 is restored to original periodic alternating voltage (square wave i.e. shown in Fig. 8).
It when scan line G2 is scanned, charges to the second row sub-pixel being connected with scan line G2, and will be with
The voltage of the corresponding second viewing angle control electrode strip ITO2 of second row sub-pixel is switched to direct current common voltage (i.e. DC
Vcom)；It, will second piece viewing angle control electrode strip ITO2 corresponding with the second row sub-pixel when line G2 to be scanned is pent
Voltage be restored to original periodic alternating voltage (square wave i.e. shown in Fig. 8).
It when scan line G3 is scanned, charges to the third line sub-pixel being connected with scan line G3, and will be with
The voltage of the corresponding third root viewing angle control electrode strip ITO3 of the third line sub-pixel is switched to direct current common voltage (i.e. DC
Vcom)；It, will third root viewing angle control electrode strip ITO3 corresponding with the third line sub-pixel when line G3 to be scanned is pent
Voltage be restored to original periodic alternating voltage (square wave i.e. shown in Fig. 8).
It when scan line G4 is scanned, charges to the fourth line sub-pixel being connected with scan line G4, and will be with
The voltage of the corresponding 4th viewing angle control electrode strip ITO4 of fourth line sub-pixel is switched to direct current common voltage (i.e. DC
Vcom)；It, will four piece viewing angle control electrode strip ITO4 corresponding with fourth line sub-pixel when line G4 to be scanned is pent
Voltage be restored to original periodic alternating voltage (square wave i.e. shown in Fig. 8).
In this way, the pixel electrode 228 in every row sub-pixel is while charging, corresponding viewing angle control on first substrate 21
The voltage of electrode strip 214a is equal (as DC Vcom), so while being applied to the exchange on viewing angle control electrode strip 214a
Voltage change △ Vp_cf caused by voltage change bring couples pixel electrode 228 is consistent in face, so as to improve residual
Mura is horizontal in shadow and face.
[second embodiment]
Figure 11 is schematic cross-section of the liquid crystal display device in wide viewing angle in second embodiment of the invention, Figure 12 Figure 11
Schematic cross-section of the middle liquid crystal display device in narrow viewing angle please join Figure 11 and Figure 12, the present embodiment and above-mentioned first embodiment
Difference be, the liquid crystal layer 23 in the present embodiment use negative liquid crystal molecule.In original state, (i.e. display panel 20 does not apply
The situation of any voltage) under, the negative liquid crystal molecule in liquid crystal layer 23 has initial pre-tilt angle relative to substrate 21,22, i.e., negative
Property liquid crystal molecule is relative to substrate 21,22 inclined postures (such as Figure 11).
It please join Figure 11, believe when applying on each viewing angle control electrode strip 214a with the direct current common voltage of public electrode 226
When number (DC Vcom) identical d. c. voltage signal, the current potential phase of each viewing angle control electrode strip 214a and public electrode 226
Together, there is no bias between each viewing angle control electrode strip 214a and public electrode 226, do not have between two substrates 21,22 vertical
Electric field is formed, and since the pre-tilt angle of liquid crystal molecule in liquid crystal layer 23 is larger, squints direction in the screen of the display panel 20
On, there is light leakage phenomena, causes due to phase delay and upper down polaroid (not shown) mismatch in the light across liquid crystal molecule
When looking up screen from the strabismus side of the display panel 20, the contrast of screen reduces and influences viewing effect, subtracts visual angle
It is small, to realize narrow viewing angle mode.
Please join Figure 12, when apply respectively to each viewing angle control electrode strip 214a unified periodic alternating voltage with
When generating bias between each viewing angle control electrode strip 214a and public electrode 226, vertical electricity is formed between two substrates 21,22
Field (as shown in arrow E in figure), since negative liquid crystal molecule will rotate under electric field action along the direction perpendicular to electric field line,
Negative liquid crystal molecule will deflect under vertical electric field effect, make the tilt angle between liquid crystal molecule and substrate 21,22
Reduce.When the inclination angle of liquid crystal molecule reduce to it is substantially parallel with substrate 21,22 when, in the screen strabismus side of the display panel 20
Upwards, light leakage phenomena can be reduced accordingly, and the visual angle of the display panel 20 increases with it, to realize wide viewing angle mode.
That is, in the above-described first embodiment, liquid crystal layer 23 uses positive liquid crystal molecules, in the initial state, just
Property liquid crystal molecule is in lying posture and display panel 20 is wide viewing angle mode；When needing to switch to narrow viewing angle mode, each
Apply periodic ac voltage signal on viewing angle control electrode strip 214a, forms vertical electric field simultaneously between two substrates 21,22
Driving positive liquid crystal molecules deflect to lateral attitude, and display panel 20 is made to show that switching to narrow viewing angle shows from wide viewing angle.
In the present embodiment, liquid crystal layer 23 uses negative liquid crystal molecule, and in the initial state, negative liquid crystal molecule is inclined
Posture and display panel 20 are narrow viewing angle mode；When needing to switch to wide viewing angle mode, in each viewing angle control electrode strip
Apply periodic ac voltage signal on 214a, forms vertical electric field between two substrates 21,22 and drive negative liquid crystal point
Son deflects to lying posture, and display panel 20 is made to show that switching to wide viewing angle shows from narrow viewing angle.
In the present embodiment, the liquid crystal molecule in liquid crystal layer 23 is negative liquid crystal molecule, to the more of viewing angle control electrode 214
When a viewing angle control electrode strip 214a applies periodic alternating voltage respectively, which is in wide viewing angle mode.Cause
This, the present embodiment under wide viewing angle mode, display panel 20 can using driving method described in above-mentioned first embodiment into
Row driving, to improve Mura problem in ghost level and face.
About the other structures feature and driving working principle of the present embodiment, above-mentioned first embodiment may refer to, herein
It repeats no more.
To sum up, visual angle provided in an embodiment of the present invention changeable liquid crystal display device and driving method, by by visual angle
Multiple viewing angle control electrode strips that coordination electrode is set as pattern structure and is spaced apart including mutually insulated control each visual angle
Electrode strip processed can apply voltage signal respectively.When a scan line is opened, swept by each data line pair with this
It retouches the connected a line sub-pixel of line to charge, and by the electricity of that viewing angle control electrode strip corresponding with the row sub-pixel
It presses signal to be switched to identical as the direct current common voltage of public electrode, every row sub-pixel can be made in charging, corresponding view
Voltage on the coordination electrode item of angle is equal, as DC Vcom.So while the alternating voltage pair of each viewing angle control electrode strip
Voltage change caused by pixel electrode couples is consistent in face, can be effectively improved Mura problem in ghost and face, be made
Image quality gets a promotion.The present embodiment can realize the light switching between wide viewing angle and narrow viewing angle in different occasions, have stronger
Operating flexibility and convenience reach the Multifunctional liquid crystal display device for integrating entertainment video and privacy secrecy.
The above is only presently preferred embodiments of the present invention, are not intended to limit the present invention in any form, although this
Invention has been disclosed in a preferred embodiment above, and however, it is not intended to limit the invention, any person skilled in the art,
It does not depart within the scope of technical solution of the present invention, when the technology contents using the disclosure above make a little change or are modified to equivalent
The equivalent embodiment of variation, but without departing from the technical solutions of the present invention, according to the technical essence of the invention to the above reality
Any simple modification, equivalent change and modification made by example are applied, all of which are still within the scope of the technical scheme of the invention.
Claims (9)
1. a kind of changeable liquid crystal display device in visual angle, including display panel (20), which includes the first base
The second substrate (22) and be located at the first substrate (21) and second base that plate (21) and the first substrate (21) are oppositely arranged
Liquid crystal layer (23) between plate (22), which is characterized in that the first substrate (21) is equipped with viewing angle control electrode (214), the view
Angle coordination electrode (214) switches between wide viewing angle mode and narrow viewing angle mode for controlling the display panel (20), this second
It is limited by scan line (222) and data line (223) on substrate (22) and is formed multiple sub-pixels, the second substrate (22) is in every height
Pixel electrode (228) are equipped in pixel, are additionally provided with public electrode (226) in the second substrate (22), the viewing angle control electrode
It (214) include mutually insulated multiple viewing angle control electrode strips (214a) spaced apart, each viewing angle control electrode strip (214a) edge
Be parallel to scan line (222) direction extend and, multiple viewing angle control electrode strip (214a) corresponding with a line sub-pixel
Quantity it is identical as the line number of sub-pixel, cover every a line sub-pixel by a corresponding viewing angle control electrode strip (214a)
Lid.
2. the changeable liquid crystal display device in visual angle according to claim 1, which is characterized in that adjacent viewing angle control electricity
Interval forms slit (214b) between pole item (214a), and the slit (214b) and scan line (222) are parallel and corresponding.
3. the changeable liquid crystal display device in visual angle according to claim 2, which is characterized in that on the first substrate (21)
Black matrix (213) are additionally provided with, the slit (214b) is corresponding with black matrix (213) and the slit (214b) is less than the black matrix
(213) line width.
4. the changeable liquid crystal display device in visual angle according to claim 1, which is characterized in that the liquid crystal display device is also
Including an at least driving chip (30), multiple viewing angle control electrode strip (214a) passes through cabling (31) and at least one drive respectively
Dynamic chip (30) electrical connection.
5. the changeable liquid crystal display device in visual angle according to claim 1, which is characterized in that the liquid crystal display device is set
There are view angle switch key (50), for issuing view angle switch signal to the liquid crystal display device for user.
6. a kind of driving method of liquid crystal display device, for driving as visual angle described in any one of claim 1 to 5 is changeable
Liquid crystal display device, which is characterized in that the driving method includes:
Apply unified periodic exchange respectively to multiple viewing angle control electrode strips (214a) of the viewing angle control electrode (214)
Voltage；
When a scan line (222) is opened, pass through each data line (223) outputting data signals pair and this scan line
(222) connected a line sub-pixel charges, and will that viewing angle control electrode strip corresponding with the row sub-pixel
The voltage signal of (214a) is switched to identical as the direct current common voltage of the public electrode (226) (DC Vcom)；
It, will that viewing angle control electrode strip corresponding with the row sub-pixel when this scan line (222) are closed
The voltage signal of (214a) is restored to original periodic alternating voltage.
7. the driving method of liquid crystal display device according to claim 6, which is characterized in that the liquid in the liquid crystal layer (23)
Brilliant molecule is positive liquid crystal molecules, is applied respectively to multiple viewing angle control electrode strips (214a) of the viewing angle control electrode (214)
When the periodic alternating voltage, which is in narrow viewing angle mode.
8. the driving method of liquid crystal display device according to claim 6, which is characterized in that the liquid in the liquid crystal layer (23)
Brilliant molecule is negative liquid crystal molecule, is applied respectively to multiple viewing angle control electrode strips (214a) of the viewing angle control electrode (214)
When the periodic alternating voltage, which is in wide viewing angle mode.
9. the driving method of liquid crystal display device according to claim 6, which is characterized in that the periodic alternating voltage
It is fluctuated up and down around the direct current common voltage (DC Vcom).
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| CN107132676B (en) * | 2017-05-15 | 2021-03-02 | Tcl华星光电技术有限公司 | Visual angle mode switching method of liquid crystal display device and liquid crystal display device |
| CN107229163B (en) * | 2017-06-28 | 2019-12-20 | 昆山龙腾光电有限公司 | Liquid crystal display device with switchable wide and narrow viewing angles and driving method |
| US11187928B2 (en) | 2017-07-04 | 2021-11-30 | Infovision Optoelectronics (Kunshan) Co., Ltd. | Method for driving liquid crystal display device capable of switching between wide viewing angle and narrow viewing angle |
| CN107219653B (en) * | 2017-07-26 | 2020-03-24 | 昆山龙腾光电股份有限公司 | Liquid crystal display device and driving module for switching wide and narrow visual angles thereof |
| CN107490884B (en) * | 2017-09-04 | 2020-04-03 | 昆山龙腾光电股份有限公司 | Selector, array substrate, liquid crystal display device and driving method |
| CN108563078B (en) * | 2018-01-24 | 2021-08-17 | 昆山龙腾光电股份有限公司 | Liquid crystal display device and driving method |
| CN108694922B (en) * | 2018-04-03 | 2020-11-03 | 昆山龙腾光电股份有限公司 | Common voltage driving method and device and display device |
| CN108732827B (en) * | 2018-08-08 | 2021-10-26 | 昆山龙腾光电股份有限公司 | Liquid crystal display device and driving method thereof |
| CN108983462A (en) * | 2018-08-27 | 2018-12-11 | 昆山龙腾光电有限公司 | The driving method of liquid crystal display device |
| CN108873417B (en) * | 2018-08-28 | 2021-06-22 | 昆山龙腾光电股份有限公司 | Driving method of liquid crystal display device |
| CN110032009A (en) * | 2018-08-29 | 2019-07-19 | 京东方科技集团股份有限公司 | Display panel, display device and anti-peeping method |
| CN109243394B (en) * | 2018-10-30 | 2022-02-15 | 昆山龙腾光电股份有限公司 | Narrow viewing angle display method |
| JP6903147B2 (en) * | 2018-11-05 | 2021-07-14 | インフォビジョン オプトエレクトロニクス （クンシャン） シーオー．，エルティーディー．Ｉｎｆｏｖｉｓｉｏｎ Ｏｐｔｏｅｌｅｃｔｒｏｎｉｃｓ （Ｋｕｎｓｈａｎ） Ｃｏ．， Ｌｔｄ． | How to drive the liquid crystal display device |
| CN109298557B (en) * | 2018-11-13 | 2021-07-13 | 昆山龙腾光电股份有限公司 | Display panel, peep-proof display method and display device |
| CN111458943B (en) * | 2020-04-22 | 2022-05-13 | 昆山龙腾光电股份有限公司 | Liquid crystal display device with switchable viewing angle and driving method |
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| CN112748611B (en) * | 2021-01-19 | 2023-07-07 | 北京京东方显示技术有限公司 | Display assembly and electronic equipment |
| CN114360465B (en) * | 2021-12-27 | 2023-05-26 | 厦门天马微电子有限公司 | Liquid crystal display device and driving method thereof |
| CN114280826A (en) * | 2021-12-30 | 2022-04-05 | Oppo广东移动通信有限公司 | Liquid crystal display panel, display screen, electronic equipment and control method |
| CN114740644A (en) * | 2022-04-19 | 2022-07-12 | 武汉华星光电技术有限公司 | Display panel and display terminal |
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| KR100671509B1 (en) * | 2000-06-01 | 2007-01-19 | 비오이 하이디스 테크놀로지 주식회사 | Fringe field switching mode lcd device |
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| JP5485742B2 (en) * | 2010-02-16 | 2014-05-07 | セイコーインスツル株式会社 | Liquid crystal display |
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