CN107797343A - Visual angle changeable liquid crystal display device and its driving method - Google Patents
Visual angle changeable liquid crystal display device and its driving method Download PDFInfo
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- CN107797343A CN107797343A CN201711091555.1A CN201711091555A CN107797343A CN 107797343 A CN107797343 A CN 107797343A CN 201711091555 A CN201711091555 A CN 201711091555A CN 107797343 A CN107797343 A CN 107797343A
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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
Abstract
A kind of changeable liquid crystal display device in visual angle, including first substrate, second substrate and liquid crystal layer, first substrate is provided with viewing angle control electrode, public electrode is provided with second substrate, limited on second substrate by scan line and data wire and form multiple sub-pixels, a thin film transistor (TFT) and a pixel electrode are provided with each sub-pixel, pixel electrode includes at least one first electrode portion and at least one second electrode portion being connected with first electrode portion, first electrode portion includes multiple first electrode bars, second electrode portion includes multiple second electrode bars, multiple first electrode bars are mutually perpendicular to multiple second electrode bars.By applying viewing angle control voltage on viewing angle control electrode, make to produce voltage difference between viewing angle control electrode and public electrode, the region of corresponding sub-pixel forms vertical electric field between two substrates, liquid crystal molecule is deflected under vertical electric field effect, realize switching of the liquid crystal display device between wide viewing angle and comprehensive narrow viewing angle.
Description
Technical field
The present invention relates to display technology field, and more particularly to a kind of changeable liquid crystal display device in visual angle and its drive
Dynamic method.
Background technology
Liquid crystal display device (liquid crystal display, LCD) have image quality is good, small volume, in light weight, low drive
The advantages of dynamic voltage, low-power consumption, relatively low radiationless and manufacturing cost, occupied an leading position in flat display field.
With the continuous progress of lcd technology, the visible angle of display is widened via original 120 ° or so
More than 160 °, while people bring visual experience at the big visual angle of enjoyment, it is also desirable to effectively protection trade secret and individual privacy,
Business loss or embarrassment caused by avoid screen message from leaking.
Present display device develops progressively towards the direction of wide viewing angle, either mobile terminal of mobile telephone application, shows on table
Show device or laptop computer applications, in addition to the demand of wide viewing angle, also need to display device in many occasions and possess width regard
The function that angle mutually switches with narrow viewing angle.At present, mainly have following several ways realize to the wide viewing angle of liquid crystal display device with
Narrow viewing angle switches.
The first is to attach blinds Protective film on a display screen to realize, when needing to carry out peep-proof, is blocked using blinds
Film, which covers screen, can reduce visual angle.But this mode needs additionally to prepare blinds Protective film, is caused greatly to user
Inconvenience, and a blinds Protective film can only realize a kind of visual angle, and after upper blinds Protective film is attached, visual angle just secures,
Narrow viewing angle pattern can only be realized, can not just show wide viewing function again.
Second is the visual angle for setting double light source back light systems to be used for adjustable liquid crystal display display device in liquid crystal display device,
This pair of light source back light system is made up of the light guide plate of two-layer laminate with reference to anti-prismatic lens, and top layer light guide plate (LGP-T) combines anti-rib
The trend that eyeglass changes light causes light to be limited in narrow angular range, realizes the narrow viewing angle of liquid crystal display device, and
The function of the anti-prismatic lens of bottom light guide plate (LGP-B) combination then realizes the wide viewing angle of liquid crystal display device.But this double light sources
Back light system can cause the thickness of liquid crystal display device and cost to increase, and do not meet the lightening development of liquid crystal display device and become
Gesture.
The third is to apply one to liquid crystal molecule using the viewing angle control electrode of colored filter substrate (CF) side to hang down
Straight electric field, realize narrow viewing angle pattern.It please join Fig. 1 and Fig. 2, the liquid crystal display device includes first substrate 11, the and of second substrate 12
Liquid crystal layer 13 between first substrate 11 and second substrate 12, first substrate 11 are provided with viewing angle control electrode 111.Such as
Shown in Fig. 1, when wide viewing angle is shown, the viewing angle control electrode 111 on first substrate 11 does not give voltage, and liquid crystal display device is realized
Wide viewing angle is shown.As shown in Fig. 2 when needing narrow viewing angle to show, the viewing angle control electrode 111 on first substrate 11 gives voltage,
Liquid crystal molecule in liquid crystal layer 13 sticks up while rotating horizontally because of the electric field (as shown in arrow E in figure) of vertical direction
Rise, liquid crystal display device contrast reduction because of light leak, finally realize narrow viewing angle.But this mode can only realize left and right
Width view angle switch on direction, it is impossible to while realize the width view angle switch on left and right directions and/or above-below direction.
The content of the invention
It is an object of the invention to provide a kind of liquid crystal display device, to solve to be only capable of realizing in available liquid crystal display device
The problem of width view angle switch of left and right directions.
The present invention, which solves its technical problem, to be realized using following technical scheme.
The present invention provides a kind of visual angle changeable liquid crystal display device, including first substrate, relative with first substrate sets
The second substrate put and the liquid crystal layer between first substrate and second substrate, first substrate are provided with viewing angle control electricity
Pole, public electrode is provided with second substrate, is limited on second substrate by scan line and data wire and forms multiple sub-pixels, each
A thin film transistor (TFT) is provided with sub-pixel and a pixel electrode, pixel electrode pass through thin film transistor (TFT) and corresponding scan line
Connected with data wire, at least one second electricity that pixel electrode includes at least one first electrode portion and is connected with first electrode portion
Pole portion, first electrode portion include multiple first electrode bars, and second electrode portion includes multiple second electrode bars, multiple first electrode bars
It is mutually perpendicular to multiple second electrode bars.
Further, pixel electrode includes a first electrode portion and a second electrode being connected with first electrode portion
Portion, first electrode portion are correspondingly arranged at the top half of each sub-pixel, and second electrode portion is correspondingly arranged at each sub-pixel
The latter half.
Further, pixel electrode includes a first electrode portion and two second electrodes being connected with first electrode portion
Portion, first electrode portion are correspondingly arranged at the middle part of each sub-pixel, and two second electrode portions are correspondingly arranged at every height picture respectively
The upper and lower part of element.
Further, multiple first electrode bars extend along data wire direction, and multiple second electrode bars are along scan line side
To extension.
Further, the liquid crystal molecule in liquid crystal layer is positivity liquid crystal molecule, the positivity liquid corresponding with first electrode portion
Direction extension of the alignment direction of brilliant molecule along first electrode bar, the positivity liquid crystal molecule corresponding with second electrode portion are matched somebody with somebody
Direction extension to direction along second electrode bar.
Further, the liquid crystal molecule in liquid crystal layer is negative liquid crystal molecule, and corresponding with each first electrode portion is negative
Property liquid crystal molecule alignment direction be vertical first electrode bar direction extension, the negative liquid crystal molecule corresponding with second electrode portion
Alignment direction for vertical second electrode bar direction extend.
Further, corresponding to each first electrode portion, the formula in alignment direction and second substrate on first substrate
To parallel or antiparallel；Corresponding to each second electrode portion, the orientation in alignment direction and second substrate on first substrate
Direction is parallel or antiparallel.
A kind of driving method of the changeable liquid crystal display device in visual angle as described above, the driving method include：
Under the first field-of-view mode, apply common electric voltage to public electrode, apply the relative public affairs to viewing angle control electrode
Common voltage has the first voltage compared with small magnitude, the voltage difference between viewing angle control electrode and public electrode is less than first default
Value；
Under second of field-of-view mode, apply common electric voltage to public electrode, apply the relative public affairs to viewing angle control electrode
Common voltage has the second voltage of higher magnitude, the voltage difference between viewing angle control electrode and public electrode is more than second default
Value, wherein second preset value is more than or equal to first preset value.
Further, under the first field-of-view mode, the common electric voltage that applies to public electrode and to viewing angle control electrode
The first voltage of application is DC voltage and both voltage difference is zero.
Further, liquid crystal layer uses positivity liquid crystal molecule, and the first field-of-view mode is wide viewing angle pattern, second of visual angle
Pattern is narrow viewing angle pattern；Or liquid crystal layer uses negative liquid crystal molecule, the first field-of-view mode is narrow viewing angle pattern, second
Kind field-of-view mode is wide viewing angle pattern.
The changeable liquid crystal display device in visual angle provided by the invention, it is provided for controlling regarding for visual angle on the first substrate
Angle coordination electrode, each sub-pixel is interior to be provided with a thin film transistor (TFT) and a pixel electrode, and each pixel electrode is included at least
One first electrode portion and at least one second electrode portion, multiple first electrode bars and each second electrode portion of each electrode portion
Multiple second electrode bars be mutually perpendicular to, by viewing angle control electrode apply viewing angle control voltage, make viewing angle control electrode
Voltage difference is produced between public electrode, the region of corresponding multiple sub-pixels forms vertical electricity simultaneously between two substrates
, the liquid crystal molecule in liquid crystal layer is deflected under vertical electric field effect, realize the liquid crystal display device in right and left
To the visual angle adjustment with above-below direction.
Brief description of the drawings
Fig. 1 is a kind of schematic cross-section of the existing liquid crystal display device in the case where wide viewing angle is shown.
Fig. 2 is schematic cross-section of Fig. 1 liquid crystal display device in the case where narrow viewing angle is shown.
Fig. 3 is the planar structure schematic diagram of liquid crystal display device in first embodiment of the invention.
Fig. 4 is the decomposition texture schematic diagram of liquid crystal display device in Fig. 3.
Fig. 5 is floor map of the liquid crystal display device in black state in Fig. 3.
Fig. 6 a to Fig. 6 c are arrangement schematic diagram of the positivity liquid crystal molecule of liquid crystal display device in Fig. 3 under different voltages.
Fig. 7 is the planar structure schematic diagram of liquid crystal display device in second embodiment of the invention.
Fig. 8 is planar structure schematic diagram of the liquid crystal display device in black state in third embodiment of the invention.
Fig. 9 a to Fig. 9 c are arrangement schematic diagram of the negative liquid crystal molecule of liquid crystal display device in Fig. 8 under different voltages.
Figure 10 is the planar structure schematic diagram of liquid crystal display device in fourth embodiment of the invention.
Embodiment
Further to illustrate the present invention to reach technical approach and effect that predetermined goal of the invention is taken, below in conjunction with
Drawings and Examples, to embodiment, structure, feature and its effect of the present invention, describe in detail as after.
[first embodiment]
Fig. 3 is the planar structure schematic diagram of liquid crystal display device in first embodiment of the invention, and Fig. 4 is liquid crystal in Fig. 3
The decomposition texture schematic diagram of showing device.Fig. 3 to Fig. 4 is refer to, the liquid crystal display device includes first substrate 21 and first substrate
21 second substrates 22 being oppositely arranged and the liquid crystal layer 23 between first substrate 21 and second substrate 22.
The liquid crystal display device that the present embodiment provides is applied to 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 almost parallel with substrate
Internal rotation is to obtain wider visual angle.In the present embodiment, the liquid crystal display device is entered by taking fringe field switch type (FFS) as an example
Row explanation.
First substrate 21 is, for example, colored filter substrate, and second substrate 22 is, for example, thin-film transistor array base-plate.The
One substrate 21 is being provided with the first polaroid 211 backwards to the side of liquid crystal layer 23, and second substrate 22 is backwards to the side of liquid crystal layer 23
Provided with the second polaroid 221, the light transmission shaft X1 of the first polaroid 211 and the second polaroid 221 light transmission shaft X2 are mutually perpendicular to.
Fig. 5 is floor map of the liquid crystal display device in black state in Fig. 3, and Fig. 6 a to Fig. 6 c are liquid crystal display in Fig. 3
Arrangement schematic diagram of the positivity liquid crystal molecule of device under different voltages.Incorporated by reference to Fig. 5 and Fig. 6 a to Fig. 6 c, first substrate 21
Viewing angle control electrode 212 is provided with the side towards liquid crystal layer 23, second substrate 22 is provided with the side towards liquid crystal layer 23 and swept
Retouch line 222, data wire 223, thin film transistor (TFT) (TFT) 224, public electrode 225 (common electrode), insulating barrier 226
With pixel electrode 227 (pixel electrode).
Wherein multi-strip scanning line 222 intersects with a plurality of data lines 223 and limits the more height pictures formed in array distribution
Plain SP (sub-pixel).In the present embodiment, each sub-pixel SP for example, red (R), green (G), blue (B) sub-pixel are more
Individual adjacent sub-pixel SP forms a pixel P (pixel) for being used to show.For example, pixel P can include red (R),
Green (G) and blueness (B) three sub-pixel SP, but the invention is not restricted to this.
A thin film transistor (TFT) 224 and a pixel electrode 227 are provided with each sub-pixel SP, the pixel electrode 227 is logical
Cross thin film transistor (TFT) 224 to connect with corresponding scan line 222 and data wire 223, the pixel electrode 227 includes at least one first
The electrode portion 227a and at least one second electrode portion 227b being connected with first electrode portion 227a.
In the present embodiment, a first electrode portion 227a and a second electrode portion are included with each pixel electrode 227
Exemplified by 227b, first electrode portion 227a is correspondingly arranged at each sub-pixel SP top half, and second electrode portion 227b is correspondingly set
Put in each sub-pixel SP the latter half, thin film transistor (TFT) 224 is electrically connected to first electrode portion 227a, in other embodiment
In, thin film transistor (TFT) 224 can be electrically connected to second electrode portion 227b.
Specifically, thin film transistor (TFT) 224 is located near the position that scan line 222 is intersected with data wire 223.Thin film transistor (TFT)
224 are electrically connected with corresponding scan line 222 and data wire 223 and first electrode portion 227a.Each thin film transistor (TFT) 224 wraps
Include grid, semiconductor layer, source electrode and drain electrode (not shown), wherein scan line 222, source electrode and drain electrode corresponding to grid electric connection
Spaced and connection is contacted with semiconductor layer, the corresponding data wire 223 of one of source electrode and drain electrode electrics connection, source electrode is with leaking
First electrode portion 227a corresponding to the electric connection of one of pole, such as data wire 223 corresponding to source electrode electric connection, drain electrode electrically connect
First electrode portion 227a corresponding to connecing.
First electrode portion 227a includes spaced multiple first electrode bars 2271, adjacent first electrode bar 2271 it
Between formed with the first slit 2274.Second electrode portion 227b includes spaced multiple second electrode bars 2272, and adjacent
Formed with the second slit 2275 between two pixel electrode bars 2272.The first electrode portion 227a is electrically connected with second electrode portion 227b
Connect, i.e. the first electrode portion 227a and second electrode portion 227b receives the same data voltage for being used to show all the time
Signal.
Further, the plurality of first electrode bar 2271 is mutually perpendicular to the plurality of second electrode bar 2272.The present embodiment
In, multiple first pixel electrode bars 2271 extend along the direction of data wire 223, and multiple second pixel electrode bars 2272 are along scanning
The direction of line 222 extends.
It refer to Fig. 3 and Fig. 4, in the present embodiment, viewing angle control electrode 212 can be plane-shape electrode, and sub-pixel SP is along sweeping
Retouch line 222 and the place direction of data wire 223 is arranged together in going.
Viewing angle control electrode 212, public electrode 225 and pixel electrode 227 can specifically use tin indium oxide (ITO), oxidation
The electrically conducting transparent materials such as indium zinc (IZO) are made for transparency electrode.Viewing angle control electrode 212 is used to control view angle switch.Common electrical
Pole 225 is used to apply the common electric voltage (Vcom) that picture is shown.Pixel electrode 227 is used to receive data-signal to control progress
Picture is shown.
In the present embodiment, pixel electrode 227 is located at the top of public electrode 225, between the two provided with insulating barrier 226, but this
Invention not limited to this, in other embodiments, pixel electrode 227 can also be located at the lower section of public electrode 225.In addition, work as the liquid
When crystal device uses plane inner switching type pattern (IPS), public electrode 225 and pixel electrode 227 may be located on same
In layer and mutually insulated is spaced apart, such as public electrode 225 and pixel electrode 227 can be respectively prepared with multiple electrodes bar
Pectinate texture and it is mutually inserted cooperation.
Liquid crystal molecule is generally divided into positivity liquid crystal molecule and negative liquid crystal molecule.In the present embodiment, the liquid in liquid crystal layer 23
Brilliant molecule is preferably positivity liquid crystal molecule, and positivity liquid crystal molecule possesses the advantages of response is fast.With each first on first substrate 21
The alignment direction of electrode portion 227a opposite positions is A1, position corresponding with each first electrode portion 227a on second substrate 22
The alignment direction put is B1, and the alignment direction on first substrate 21 with each second electrode portion 227b opposite positions is A2,
With the alignment direction of each second electrode portion 227b opposite positions it is B2 on two substrates 22.In the present embodiment, first substrate 21
It is along first electrode bar with alignment direction A1, B1 on second substrate 22 with each first electrode portion 227a opposite positions
2271 directions extend, the orientation side on first substrate 21 and second substrate 22 with each second electrode portion 227b opposite positions
It is to extend along the direction of second electrode bar 2272 to A2, B2.Liquid crystal molecule in liquid crystal layer 23 is along first substrate 21 and
Alignment direction arrangement on two substrates 22, initial arrangement of the liquid crystal molecule in first electrode portion 227a and second electrode portion 227b
Direction is orthogonal.
The present embodiment can carry out orientation to first substrate 21 and second substrate 22 respectively by way of light orientation, and light is matched somebody with somebody
To the modes such as mask can be used to realize respectively orientation is carried out to first electrode portion 227a and second electrode portion 227b points.
Further, corresponding to each first electrode portion 227a, alignment direction A1 and second substrate on first substrate 21
Alignment direction B1 parallel or antiparallel (being antiparallel in the present embodiment) on 22；Corresponding to each second electrode portion
227b, the alignment direction A2 on first substrate 21 be parallel with the alignment direction B2 on second substrate 22 or antiparallel (this reality
It is antiparallel for applying in example).
By applying voltage on viewing angle control electrode 212, can viewing angle control electrode 212 and public electrode 225 it
Between produce voltage difference, the liquid crystal display device is switched between wide viewing angle pattern and narrow viewing angle pattern, it is specific if Fig. 6 a are to scheming
Shown in 6c.
It please join Fig. 6 a, under the original state that the liquid crystal display device does not apply any voltage, the positivity in liquid crystal layer 23
Liquid crystal molecule arranges along alignment direction and the lie low posture parallel with first substrate 21, second substrate 22 is presented, wherein first
Between substrate 21, second substrate 22 correspond to each first electrode portion 227a regions in liquid crystal molecule along alignment direction A1,
B1 arrange, between first substrate 21, second substrate 22 correspond to each second electrode portion 227b regions in liquid crystal molecule along
Alignment direction A2, B2 arranges.The long axis direction of positivity liquid crystal molecule is put down substantially with first substrate 21, the surface of second substrate 22
OK.In actual applications, can have between the positivity liquid crystal molecule and first substrate 21, second substrate 22 in liquid crystal layer 23
The initial pre-tilt angle of very little, the scope of the initial pre-tilt angle may be less than or equal to 5 degree, i.e.,：0°≦θ≦5°.Now, due to
The voltage of display is not applied on pixel electrode 227, liquid crystal molecule is in the plane parallel with first substrate 21, second substrate 22
Do not rotate inside, black state is presented in the liquid crystal display device.
It please join Fig. 6 b, when the voltage for applying display on pixel electrode 227, and in viewing angle control electrode 212 and common electrical
When no applied voltage is poor between pole 225 or applies very little voltage difference (such as less than 0.5v), the positivity liquid crystal point in liquid crystal layer 23
The angle of inclination of son hardly changes, and is still the posture that lies low, liquid crystal molecule is traditional face internal electric field type of drive, by position
In the pixel electrode 227 (including first electrode portion 227a and second electrode portion 227b) on same substrate (i.e. second substrate 22) with
The face internal electric field formed between public electrode 225 drives liquid crystal molecule in the plane parallel with first substrate 21, second substrate 22
Internal rotation, liquid crystal molecule realize wide viewing angle under stronger face internal electric field effect.
It please join Fig. 6 c, when the voltage for applying display on pixel electrode 227, and in viewing angle control electrode 212 and common electrical
When applying a certain size voltage difference between pole 225, due to the viewing angle control electrode 212 on first substrate 21 and second substrate 22
On public electrode 225 between voltage difference be present, therefore each first electrode portion 227a can be corresponded between two substrates 21,22
Vertical electric field (as shown in arrow E in figure) is formed with each second electrode portion 227b region, because positivity liquid crystal molecule is in electricity
There is along the trend rotated parallel to electric field line direction long axis direction under field action, therefore with each first electrode portion 227a and often
Positivity liquid crystal molecule corresponding individual second electrode portion 227b the vertical electric field effect under deflect, with first substrate 21,
Angle of inclination increase between second substrate 22, and deflect to lateral attitude from the posture that lies low.Each first electrode portion 227a and
Positivity liquid crystal molecule in each second electrode portion 227b deflects under vertical electric field effect, fills the liquid crystal display
The visual angle put on left and right directions and above-below direction reduces, so that the liquid crystal display device is in left and right directions and above-below direction
On switch to narrow viewing angle.
In the present embodiment, the voltage exported to public electrode 225 is direct current common electric voltage (i.e. DC Vcom), is controlled to visual angle
The voltage that electrode 212 processed exports is the periodic AC voltage fluctuated up and down centered on the direct current common electric voltage.The exchange
The waveform of voltage is specifically as follows square wave, sine wave, triangular wave or sawtooth waveforms etc..
It is non-on the periphery of the liquid crystal display device in order to apply voltage to the viewing angle control electrode 212 on first substrate 21
Viewing area, viewing angle control electrode 212 can be electrically conducted to second substrate from first substrate 21 by conducting resinl (not shown)
22, provided by driving chip (not shown) on voltage to second substrate 22, then by second substrate 22 by conducting resinl by voltage
It is applied on the viewing angle control electrode 212 of first substrate 21.
[second embodiment]
Fig. 7 is the planar structure schematic diagram of liquid crystal display device in second embodiment of the invention.It refer to Fig. 7, this implementation
In example, the liquid crystal molecule in liquid crystal layer 23 is negative liquid crystal molecule, and each sub-pixel SP includes a thin film transistor (TFT) 224 and one
Individual pixel electrode 227, each pixel electrode 227 include a first electrode portion 227a and two second electrode portion 227b, and this two
Individual second electrode portion 227b is connected with first electrode portion 227a, and first electrode portion 227a is correspondingly arranged at each sub-pixel
SP middle part, two second electrode portion 227b are correspondingly arranged at each sub-pixel SP upper and lower part.Thin film transistor (TFT)
224 are electrically connected to second electrode portion 227b, and in other embodiments, thin film transistor (TFT) 224 can be electrically connected to the first electricity
Pole portion 227a.
Specifically, thin film transistor (TFT) 224 is located near the position that scan line 222 is intersected with data wire 223.Thin film transistor (TFT)
224 are electrically connected with corresponding scan line 222 and data wire 223 and second electrode portion 227b.Each thin film transistor (TFT) 224 wraps
Include grid, semiconductor layer, source electrode and drain electrode (not shown), wherein scan line 222, source electrode and drain electrode corresponding to grid electric connection
Be spaced from each other and contact connection with semiconductor layer, the corresponding data wire 223 of one of source electrode and drain electrode electrics connection, source electrode and
Second electrode portion 227b corresponding to one of drain electrode electric connection, such as data wire 223 corresponding to source electrode electric connection, drain electrode are electrical
Second electrode portion 227b corresponding to connection.
The difference of the present embodiment and first embodiment is that each pixel electrode 227 includes a first electrode portion 227a
With two second electrode portion 227b, the also included other structures of the present embodiment refer to first embodiment.
[3rd embodiment]
Fig. 8 is planar structure schematic diagram of the liquid crystal display device in black state in third embodiment of the invention, and Fig. 9 a extremely scheme
9c is arrangement schematic diagram of the negative liquid crystal molecule of liquid crystal display device in Fig. 8 under different voltages.Please incorporated by reference to Fig. 8 and Fig. 9 a
To 9c, a thin film transistor (TFT) 224 and a pixel electrode 227 are provided with each sub-pixel SP, the pixel electrode 227 is by thin
Film transistor 224 connects with corresponding scan line 222 and data wire 223, and the pixel electrode 227 includes at least one first electrode
The portion 227a and at least one second electrode portion 227b being connected with first electrode portion 227a.
In the present embodiment, a first electrode portion 227a and a second electrode portion are included with each pixel electrode 227
Exemplified by 227b, first electrode portion 227a is correspondingly arranged at each sub-pixel SP top half, and second electrode portion 227b is correspondingly set
Put in each sub-pixel SP the latter half, thin film transistor (TFT) 224 is electrically connected to first electrode portion 227a, in other embodiment
In, thin film transistor (TFT) 224 can be electrically connected to second electrode portion 227b.
Liquid crystal molecule is generally divided into positivity liquid crystal molecule and negative liquid crystal molecule.In the present embodiment, the liquid in liquid crystal layer 23
Brilliant molecule is negative liquid crystal molecule.Alignment direction on first substrate 21 with each first electrode portion 227a opposite positions is
A1, is B1 with the alignment direction of each first electrode portion 227a opposite positions on second substrate 22, on first substrate 21 with it is every
The alignment direction of individual second electrode portion 227b opposite positions is A2, relative with each second electrode portion 227b on second substrate 22
The alignment direction for answering position is B2.In the present embodiment, on first substrate 21 and second substrate 22 with each first electrode portion 227a
Alignment direction A1, B1 of opposite position is to extend perpendicular to the direction of first electrode bar 2271, first substrate 21 and second substrate
Alignment direction A2, B2 on 22 with each second electrode portion 227b opposite positions is perpendicular to the side of second electrode bar 2272
To extension.Liquid crystal molecule in liquid crystal layer 23 arranges along the alignment direction on first substrate 21 and second substrate 22, liquid crystal point
Initial arrangement direction of the son in first electrode portion 227a and second electrode portion 227b is orthogonal.
The also included miscellaneous part of the present embodiment, please with specific reference to first embodiment.
, can be in viewing angle control electrode 212 and public affairs by applying voltage on viewing angle control electrode 212 in the present embodiment
Voltage difference is produced between common electrode 225, the liquid crystal display device is switched between wide viewing angle pattern and narrow viewing angle pattern, specifically
As shown in Fig. 9 a to Fig. 9 c.
Please join Fig. 9 a, when the voltage for not applying display on pixel electrode 227, and viewing angle control electrode 212 with it is public
When applying a certain size voltage difference simultaneously between electrode 225, each first electrode can be corresponded between two substrates 21,22
Portion 227a and each second electrode portion 227b region are respectively formed vertical electric field (as shown in arrow E in figure), due to negative liquid crystal
Molecule has under electric field action along the trend rotated perpendicular to electric field line direction, therefore under vertical electric field effect, negativity
Liquid crystal molecule deflects so that and the angle of inclination between negative liquid crystal molecule and first substrate 21, second substrate 22 reduces,
The posture that lies low is deflected to from lateral attitude.Now due to not applying the voltage of display on pixel electrode 227, liquid crystal molecule exists
Do not rotated in the plane parallel with first substrate 21, second substrate 22, the liquid crystal display device is shown as black state.
Refer to Fig. 9 b, when on pixel electrode 227 apply display voltage, and viewing angle control electrode 212 with it is public
When applying a certain size voltage difference simultaneously between electrode 225, each first electrode can be corresponded between two substrates 21,22
Portion 227a and each second electrode portion 227b region are respectively formed vertical electric field (as shown in arrow E in figure), in the vertical electric field
Under effect, negative liquid crystal molecule deflects so that inclining between negative liquid crystal molecule and first substrate 21, second substrate 22
Rake angle reduces, and the posture that lies low is deflected to from lateral attitude.Now due to being applied with the electricity of display on pixel electrode 227
Pressure, negative liquid crystal molecule are squinted on direction in the plane internal rotation parallel with substrate 21,22, the liquid crystal display device in screen,
Light leakage phenomena can be reduced accordingly, and visual angle is optimal, and the liquid crystal display device is rendered as wide viewing angle and shown.
Refer to Fig. 9 c, when on pixel electrode 227 apply display voltage, and viewing angle control electrode 212 with it is public
Equal no applied voltage difference or when applying voltage difference (the such as less than 0.5v) of very little between electrode 225, in first substrate 21, the
Corresponding each first electrode portion 227a and each second electrode portion 227b region does not have vertical electric field between two substrates 22, should
The inclination angle of negative liquid crystal molecule in region hardly changes, and remains as heeling condition.So that the liquid crystal display
Visual angle of the device on left and right directions and above-below direction reduces, and makes the liquid crystal display device on left and right directions and above-below direction
Switch to narrow viewing angle.
[fourth embodiment]
Figure 10 is the planar structure schematic diagram of liquid crystal display device in fourth embodiment of the invention.It refer to Figure 10, this reality
Apply in example, each sub-pixel SP includes a thin film transistor (TFT) 224 and a pixel electrode 227, and each pixel electrode 227 wraps
Include a first electrode portion 227a and two second electrode portion 227b, two second electrode portion 227b with the first electrode portion
227a connections, first electrode portion 227a are correspondingly arranged at each sub-pixel SP middle part, two 227b pairs of second electrode portions
Each sub-pixel SP upper and lower part should be arranged on.Thin film transistor (TFT) 224 is electrically connected to second electrode portion 227b, at other
In embodiment, thin film transistor (TFT) 224 can be electrically connected to first electrode portion 227a.
Specifically, thin film transistor (TFT) 224 is located near the position that scan line 222 is intersected with data wire 223.Thin film transistor (TFT)
224 are electrically connected with corresponding scan line 222 and data wire 223 and second electrode portion 227b.
The difference of the present embodiment and 3rd embodiment is that each pixel electrode 227 includes a first electrode portion 227a
With two second electrode portion 227b, the also included other structures of the present embodiment refer to 3rd embodiment.
The present invention is applied to the voltage on viewing angle control electrode 212 by control, makes first electrode 212 and public electrode
A certain size voltage difference is produced between 225, each first electrode portion 227a is corresponded between first substrate 21, second substrate 22
Vertical electric field is formed with each second electrode portion 227b region, the liquid crystal molecule in liquid crystal layer 23 is acted in the vertical electric field
Under deflect, cause light leakage phenomena occur and reduce the contrast of screen, make the liquid crystal display device in left and right directions and
The visual angle of above-below direction reduces, and so as to realize the wide viewing angle on above-below direction and left and right directions and narrow viewing angle free switching, has
Stronger operating flexibility and convenience.
Herein, term " comprising ", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, are removed
Those listed key elements are included, but also the other element being not expressly set out can be included.
Herein, the involved noun of locality such as forward and backward, upper and lower is to be located at parts in accompanying drawing in figure and zero
The mutual position of part is intended merely to the clear of expression technology scheme and conveniently come what is defined.It should be appreciated that the noun of locality
Use should not limit the claimed scope of the application.
In the case where not conflicting, the feature in embodiment and embodiment herein-above set forth can be combined with each other.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (10)
1. a kind of changeable liquid crystal display device in visual angle, including first substrate (21), relative with the first substrate (21) set
The second substrate (22) put and the liquid crystal layer (23) between the first substrate (21) and the second substrate (22), institute
State first substrate (21) and be provided with viewing angle control electrode (212), public electrode (225) is provided with the second substrate (22),
Limited on the second substrate (22) by scan line (222) and data wire (223) and form multiple sub-pixels (SP), each sub-pixel
(SP) thin film transistor (TFT) (224) and a pixel electrode (227) are provided with, the pixel electrode (227) passes through described thin
Film transistor (224) connects with corresponding scan line (222) and data wire (223), it is characterised in that the pixel electrode
(227) at least one second electricity for including at least one first electrode portion (227a) and being connected with the first electrode portion (227a)
Pole portion (227b), the first electrode portion (227a) include multiple first electrode bars (2271), the second electrode portion (227b)
Including multiple second electrode bars (2272), the multiple first electrode bar (2271) and the multiple second electrode bar (2272) phase
It is mutually vertical.
2. the changeable liquid crystal display device in visual angle as claimed in claim 1, it is characterised in that the pixel electrode (227)
A second electrode portion (227b) being connected including a first electrode portion (227a) and with the first electrode portion (227a), institute
The top half that first electrode portion (227a) is correspondingly arranged at each sub-pixel (SP) is stated, the second electrode portion (227b) is corresponding
It is arranged on each sub-pixel (SP) the latter half.
3. the changeable liquid crystal display device in visual angle as claimed in claim 1, it is characterised in that the pixel electrode (227)
Two second electrode portions (227b) being connected including a first electrode portion (227a) and with the first electrode portion (227a), institute
The middle part that first electrode portion (227a) is correspondingly arranged at each sub-pixel (SP) is stated, described two second electrode portions (227b) are respectively
It is correspondingly arranged at each sub-pixel (SP) upper and lower part.
4. the changeable liquid crystal display device in visual angle as claimed in claim 1, it is characterised in that the multiple first electrode bar
(2271) extend along the data wire (223) direction, the multiple second electrode bar (2272) is along the scan line (222)
Direction extends.
5. the changeable liquid crystal display device in visual angle as claimed in claim 1, it is characterised in that in the liquid crystal layer (23)
Liquid crystal molecule is positivity liquid crystal molecule, the alignment direction of the positivity liquid crystal molecule corresponding with the first electrode portion (227a)
The direction extension of (A1, B1) along the first electrode bar (2271), the positivity corresponding with the second electrode portion (227b)
Direction extension of the alignment direction (A2, B2) of liquid crystal molecule along the second electrode bar (2272).
6. the changeable liquid crystal display device in visual angle as claimed in claim 1, it is characterised in that in the liquid crystal layer (23)
Liquid crystal molecule is negative liquid crystal molecule, the alignment direction of the negative liquid crystal molecule corresponding with each first electrode portion (227a)
(A1, B1) extends for vertical first electrode bar (2271) direction, the negativity corresponding with the second electrode portion (227b)
The alignment direction (A2, B2) of liquid crystal molecule is the direction extension of the vertical second electrode bar (2272).
7. the changeable liquid crystal display device in visual angle as claimed in claim 1, it is characterised in that corresponding to each first electrode
Portion (227a), the alignment direction (A1) on the first substrate (21) are parallel with direction (B1) with the second substrate (22)
It is or antiparallel；Corresponding to each second electrode portion (227b), alignment direction (A2) on the first substrate (21) with it is described
Alignment direction (B2) on second substrate (22) is parallel or antiparallel.
8. a kind of driving method of the changeable liquid crystal display device in visual angle as described in any one of claim 1 to 7, its feature
It is, the driving method includes：
Under the first field-of-view mode, apply common electric voltage to the public electrode (225), to the viewing angle control electrode
(212) apply relative first voltage of the common electric voltage with compared with small magnitude, make the viewing angle control electrode (212) and the public affairs
Voltage difference between common electrode (225) is less than the first preset value；
Under second of field-of-view mode, apply common electric voltage to the public electrode (225), to the viewing angle control electrode
(212) applying the relative common electric voltage has the second voltage of higher magnitude, makes the viewing angle control electrode (212) and the public affairs
Voltage difference between common electrode (225) is more than the second preset value, wherein the second preset value is more than or equal to the first preset value.
9. the driving method of the changeable liquid crystal display device in visual angle as claimed in claim 8, it is characterised in that at the first
Under field-of-view mode, the common electric voltage applied to the public electrode (225) and apply to the viewing angle control electrode (212) the
One voltage is DC voltage and both voltage difference is zero.
10. the driving method of the changeable liquid crystal display device in visual angle as claimed in claim 8, it is characterised in that liquid crystal layer
(23) positivity liquid crystal molecule is used, the first described field-of-view mode is wide viewing angle pattern, and second of field-of-view mode regards to be narrow
Angle mould formula；Or the liquid crystal layer (23) uses negative liquid crystal molecule, the first described field-of-view mode is narrow viewing angle pattern, institute
It is wide viewing angle pattern to state second of field-of-view mode.
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| CN110673407A (en) * | 2019-10-11 | 2020-01-10 | 昆山龙腾光电股份有限公司 | Liquid crystal display device having a plurality of pixel electrodes |
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