CN109298571A - Liquid crystal display device and driving method - Google Patents
Liquid crystal display device and driving method Download PDFInfo
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- CN109298571A CN109298571A CN201811273955.9A CN201811273955A CN109298571A CN 109298571 A CN109298571 A CN 109298571A CN 201811273955 A CN201811273955 A CN 201811273955A CN 109298571 A CN109298571 A CN 109298571A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 67
- 230000005611 electricity Effects 0.000 claims description 7
- 238000000059 patterning Methods 0.000 claims description 2
- 239000010408 film Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 15
- 230000005684 electric field Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 230000000007 visual effect Effects 0.000 description 10
- 230000001681 protective effect Effects 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 102000009565 Lysosomal-Associated Membrane Protein 2 Human genes 0.000 description 1
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- 230000009471 action Effects 0.000 description 1
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- 210000001520 comb Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004883 computer application Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 239000004744 fabric Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1323—Arrangements for providing a switchable viewing angle
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
- Geometry (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
A kind of liquid crystal display device and driving method, the liquid crystal display device includes first substrate, the second substrate and the liquid crystal layer between first substrate and the second substrate, first substrate is equipped with public electrode, liquid crystal layer is closed on first substrate equipped with the first alignment film, first alignment film has the first alignment direction, liquid crystal layer is closed in the second substrate equipped with the second alignment film, second alignment film has the second alignment direction, first alignment direction is vertical with second alignment direction, liquid crystal layer uses positive liquid crystal molecules, it is additionally provided with and is located on the same floor and the first electrode and second electrode of mutually insulated on first substrate, first electrode includes the multiple first electrode items being electrically connected, second electrode includes the multiple second electrode items being electrically connected, multiple first electrode item and multiple second electrode item are parallel to each other interval and friendship For arrangement, each first electrode item and each second electrode item are covered each by a line or a column pixel unit.
Description
Technical field
The present invention relates to the technical fields of liquid crystal display, more particularly to a kind of liquid crystal display device and driving method.
Background technique
Liquid crystal display device (liquid crystal display, LCD) has good, small in size, light-weight, the low drive of image quality
Dynamic voltage, low-power consumption, radiationless and relatively low manufacturing cost advantage, occupy an leading position in flat display field.
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, other than the demand of wide viewing angle, also needs display device to have wide view in many occasions
The function that angle and narrow viewing angle mutually switch.
The wide viewing angle and narrow viewing angle of liquid crystal display device are switched currently, there are following methods to realize.
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, causes greatly to user
Inconvenience, and a blinds Protective film can only realize a kind of visual angle, and after attaching upper blinds Protective film, visual angle is just secured,
It can only realize narrow viewing angle mode.
Second is the visual angle that double light source back light systems are arranged in liquid crystal display device and are used to adjust liquid crystal display device,
Double light source back light systems combine anti-prismatic lens to constitute by the light guide plate of two-layer laminate, and top layer light guide plate (LGP-T) combines anti-rib
Eyeglass changes the trend of light so that light is 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 will lead to the thickness of liquid crystal display device and cost increases, and does not meet the lightening development of liquid crystal display device and becomes
Gesture.
Summary of the invention
The purpose of the present invention is to provide a kind of liquid crystal display device and driving method, it can be achieved that the width view of different occasions
Angle switching, solves drawback possessed by existing view angle switch mode.
The present invention provides a kind of liquid crystal display device, including first substrate, the second base being oppositely arranged with the first substrate
Plate and the liquid crystal layer between the first substrate and the second substrate, the first substrate are equipped with public electrode, this second
It is limited on substrate by scan line and data line and forms multiple pixel units, pixel electrode is equipped in each pixel unit, this first
The liquid crystal layer is closed on substrate equipped with the first alignment film, which has the first alignment direction, faces in the second substrate
The nearly liquid crystal layer is equipped with the second alignment film, which has the second alignment direction, first alignment direction and this second
Alignment direction is vertical, which uses positive liquid crystal molecules, which is characterized in that is additionally provided with and is located on the same floor on the first substrate
And the first electrode and second electrode of mutually insulated, the first electrode include the multiple first electrode items being electrically connected, it should
Second electrode includes the multiple second electrode items being electrically connected, multiple first electrode item and multiple second electrode
Item, which is parallel to each other, to be spaced and is alternately arranged, and each first electrode item and each second electrode item are covered each by a line or a column
Pixel unit.
Further, each first electrode item and each second electrode item extend each along horizontal direction and are covered each by one
Row pixel unit；Alternatively, each first electrode item and each second electrode item extend each along vertical direction and are covered each by one
Column pixel unit.
Further, each first electrode item and each second electrode item are in position corresponding with each pixel unit shape
As patterned comb electrode.
Further, the electrode strip of the comb electrode and 0 °~45 ° of the angle of horizontal direction, first alignment direction are edge
Vertical direction, second alignment direction be along horizontal direction；Alternatively, the electrode strip of the comb electrode and the folder of vertical direction
0 °~45 ° of angle, first alignment direction are along horizontal direction, which is along vertical direction.
Further, each pixel unit includes first area and second area, each first electrode item and each second
Electrode strip is formed as patterned first comb electrode, Mei Ge in position corresponding with the first area of each pixel unit
One electrode strip and each second electrode item are formed as patterned in position corresponding with the second area of each pixel unit
0 °~45 ° of angle of second comb electrode, the electrode strip of first comb electrode and horizontal direction, the electricity of second comb electrode
0 °~45 ° of angle of pole item and vertical direction, first alignment direction be along vertical direction, second alignment direction be along
Horizontal direction.
Further, the first insulating layer, the first electrode are equipped between the public electrode and the first electrode, second electrode
With the second electrode compared to the public electrode closer to the liquid crystal layer.
Further, it is additionally provided with third electrode in the second substrate, the is equipped between the pixel electrode and the third electrode
Two insulating layers, the third electrode compared to the pixel electrode closer to the liquid crystal layer, the third electrode with each pixel unit
Corresponding position is formed as patterned pectinate texture, which is connected with the public electrode conduction.
The present invention also provides a kind of for driving the driving method of above-mentioned liquid crystal display device, which includes:
Under wide viewing angle mode, apply direct current common voltage to the public electrode, to the first electrode and the second electrode
Apply the voltage same or similar with the public electrode respectively, makes between the first electrode and the public electrode and this is second electric
Voltage difference between pole and the public electrode is respectively less than preset value；
Under narrow viewing angle mode, applies direct current common voltage to the public electrode, apply to the first electrode with the direct current
First alternating voltage of upper below-center offset centered on common voltage, applies on centered on the direct current common voltage to the second electrode
Second alternating voltage of below-center offset, make between the first electrode and the public electrode and the second electrode and the public electrode it
Between voltage difference be all larger than preset value, and the pixel unit that the polarity of ` first alternating voltage and the first electrode are covered
The polarity of the data voltage of upper application is on the contrary, on the pixel unit that the polarity of second alternating voltage and the second electrode are covered
The polarity of the data voltage of application is opposite.
Further, under wide viewing angle mode, between the first electrode and the public electrode and the second electrode with should
Voltage difference between public electrode is between 0V~0.5V；Under narrow viewing angle mode, between the first electrode and the public electrode
And the voltage difference between the second electrode and the public electrode is between 3V~7V.
Further, the polarity of first alternating voltage and the polarity of second alternating voltage are on the contrary, first alternating current
Pressure and the every frame reversion of the polarity of second alternating voltage are primary, when each first electrode item and each second electrode item are distinguished
When covering one-row pixels unit, which is line inversion driving, when each first electrode item and each second electrode
When item is covered each by a column pixel unit, which is column inversion driving.
Liquid crystal display device and driving method provided by the invention, by the way that public electrode and first are arranged on the first substrate
Electrode and second electrode can control liquid crystal display dress by controlling the voltage being applied in first electrode and second electrode
Set between wide viewing angle and narrow viewing angle realize switching, thus without using Protective film, do not increase product thickness and production substantially
Under conditions of cost realize width view angle switch, have stronger operating flexibility and convenience, reach collection entertainment video with it is hidden
Private secrecy is in the Multifunctional liquid crystal display device of one.
Detailed description of the invention
Fig. 1 is the cross section structure schematic diagram of liquid crystal display device in first embodiment of the invention.
Fig. 2 is one of the electrical block diagram of liquid crystal display device in Fig. 1.
Fig. 3 is the planar structure schematic diagram of first electrode and second electrode in Fig. 2.
Fig. 4 is two of the electrical block diagram of liquid crystal display device in Fig. 1.
Fig. 5 is the planar structure schematic diagram of first electrode and second electrode in Fig. 4.
Fig. 6 a-6b is one of the schematic diagram in the single pixel region of liquid crystal display device in Fig. 1.
Fig. 7 a-7b is two of the schematic diagram in the single pixel region of liquid crystal display device in Fig. 1.
Fig. 8 a-8b is three of the schematic diagram in the single pixel region of liquid crystal display device in Fig. 1.
Fig. 9 a-9b is deflection schematic diagram of the liquid crystal display device under wide viewing angle mode in Fig. 1.
Figure 10 a-10b is deflection schematic diagram of the liquid crystal display device under narrow viewing angle mode in Fig. 1.
Drive waveforms schematic diagram when Figure 11 is the liquid crystal display device using framework shown in Fig. 2.
Drive waveforms schematic diagram when Figure 12 is the liquid crystal display device using framework shown in Fig. 4.
Figure 13 is the cross section structure schematic diagram of liquid crystal display device in second embodiment of the invention.
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.
Fig. 1 is the cross section structure schematic diagram of liquid crystal display device in first embodiment of the invention, please join Fig. 1, the liquid crystal
Showing device includes first substrate 20, the second substrate 30 being oppositely arranged with first substrate 20 and is located at first substrate 20 and the second base
Liquid crystal layer 40 between plate 30.First substrate 20 is, for example, colored filter substrate, and the second substrate 30 is, for example, thin film transistor (TFT)
Array substrate.
First substrate 20 is equipped with color blocking layer 21, black matrix 22,23 (common of public electrode in the side towards liquid crystal layer 40
Electrode), the first insulating layer 26, first electrode 24, second electrode 25 and the first alignment film 28.Color blocking layer 21 includes R, G, B
The color blocking material of three colors, black matrix 22 are located between the sub-pixel of tri- color of R, G, B, make to pass through black matrix between adjacent sub-pixel
22 are spaced from each other, and prevent light leakage.Public electrode 23 is arranged in color blocking layer 21 and black matrix 22, and public electrode 23 can be whole
Face structure.
Incorporated by reference to Fig. 2 to Fig. 5, first electrode 24 and second electrode 25 is located on the same floor and mutually insulated, first electrode 24
It can be made and be formed by etch patterning by same conductive layer with second electrode 25.Wherein, first electrode 24 includes electrical connection
Multiple first electrode 24a together, second electrode 25 include the multiple second electrode 25a being electrically connected, this is more
A first electrode 24a and multiple second electrode 25a, which is parallel to each other, to be spaced and is alternately arranged, each first electrode 24a
A line or a column pixel unit P are covered each by with each second electrode 25a.
As shown in Figures 2 and 3, each first electrode 24a and each second electrode 25a extends each along horizontal direction
And it is covered each by one-row pixels unit P, for example, each first electrode article 24a is covered each by positioned at odd-numbered line (the 1st, 3,5 ... row)
Pixel unit P, each second electrode article 25a is covered each by the pixel unit P positioned at even number line (the 2nd, 4,6 ... row).
Alternatively, as shown in Figure 4 and Figure 5, each first electrode 24a and each second electrode 25a are each along vertical side
To extending and be covered each by a column pixel unit P, for example, each first electrode article 24a be covered each by positioned at odd column (the 1st, 3,
5 ... column) pixel unit P, each second electrode article 25a is covered each by the pixel unit positioned at even column (the 2nd, 4,6 ... column)
P。
Further, first electrode 24 further includes the first conduction that is vertical with multiple first electrode 24a and being electrically connected
24b, so that multiple first electrode 24a is electrically connected by the first conductive bar 24b；Second electrode 25 further include with
Multiple second electrode 25a is vertical and the second conductive bar 25b of electrical connection, so that multiple second electrode article 25a passes through the
Two conductive bar 25b are electrically connected.First electrode 24 and second electrode 25 are mutually inserted cooperation like two combs.
In the present embodiment, the first insulating layer 26 is arranged between public electrode 23 and first electrode 24, second electrode 25, the
One electrode 24 and second electrode 25 are compared to public electrode 23 closer to liquid crystal layer 40.
The second substrate 30 is being equipped with scan line 31, data line 32, film crystal towards the side of liquid crystal layer 40 (i.e. inside)
Manage (TFT) 33, pixel electrode 35 (pixel electrode) and the second alignment film 38.
Intersect to limit with 32 mutually insulated of multiple data lines by multi-strip scanning line 31 in the second substrate 30 and be formed in array point
Pixel electrode 35 is equipped in multiple pixel unit P of cloth, each pixel unit P, the pixel electrode 35 in each pixel unit P is logical
Thin film transistor (TFT) 33 is crossed to connect with corresponding scan line 31 and data line 32.
First alignment film 28 and the second alignment film 38 close on the setting of liquid crystal layer 40, and the first alignment film 28 has the first orientation
Direction X1, the second alignment film 38 have the second alignment direction X2, the first alignment direction X1 vertical with the second alignment direction X2.Specifically
Ground can realize that the orientation to the first alignment film 28 and the second alignment film 38 is operated by modes such as friction matching, light orientations.
Liquid crystal molecule in liquid crystal layer 40 close to first substrate 20 is arranged along the first alignment direction X1, close to the second substrate
30 liquid crystal molecule is arranged along the second alignment direction X2, since the first alignment direction X1 is vertical with the second alignment direction X2, because
90 ° of twisting gesture arrangement is presented in this liquid crystal molecule between upper and lower two substrates 20,30, as shown in Figure 1.
Further, as shown in Figure 3 and Figure 5, each first electrode 24a and each second electrode 25a with it is each
The corresponding position pixel unit P is formed as patterned electrode, is specially that comb electrode (has slit in the present embodiment
S).In other embodiments, which is also possible to the electrode of other pierced patterns.
Fig. 6 a illustrates the floor map in single pixel region on first substrate, and Fig. 6 b illustrates single pixel in the second substrate
The floor map in region please join Fig. 6 a and Fig. 6 b, in a wherein embodiment, the electrode strip of the comb electrode and level side
To angle theta 1 can be 0 °~45 °, for example, 7 °, the first alignment direction X1 be along vertical direction, the second orientation side
It is along horizontal direction to X2, the liquid crystal display device can realize the switching of wide viewing angle and narrow viewing angle in the lateral direction at this time
It has been shown that, i.e., may be implemented that wide viewing angle is shown or narrow viewing angle is shown in the lateral direction.In the present embodiment, comb electrode
The angle theta 1 of electrode strip and horizontal direction can be 0 °~45 °, and left and right directions under big visual angle can be all formed in narrow viewing angle display
Light leakage, but angle, θ 1 increases, and big visual angle light leakage degree reduces on left and right directions, narrow viewing angle effect is influenced, it is therefore preferred that folder
Angle θ 1 is 7 °.
Fig. 7 a illustrates the floor map in single pixel region on first substrate, and Fig. 7 b illustrates single pixel in the second substrate
The floor map in region please join Fig. 7 a and Fig. 7 b, in another embodiment, the electrode strip and vertical direction of the comb electrode
Angle theta 2 can be 0 °~45 °, for example, 7 °, the first alignment direction X1 be along horizontal direction, second alignment direction
X2 is that along vertical direction, the liquid crystal display device can realize that the switching of wide viewing angle and narrow viewing angle is aobvious in the up-down direction at this time
Show, i.e., may be implemented that wide viewing angle is shown or narrow viewing angle is shown in the up-down direction.In the present embodiment, the electricity of comb electrode
The angle theta 2 of pole item and vertical direction can be 0 °~45 °, and up and down direction is leaked under can all forming big visual angle in narrow viewing angle display
Light, but angle, θ 2 increases, and big visual angle light leakage degree reduces in vertical direction, narrow viewing angle effect is influenced, it is therefore preferred that angle theta
2 be 7 °.
Fig. 8 a illustrates the floor map in single pixel region on first substrate, and Fig. 8 b illustrates single pixel in the second substrate
The floor map in region please join Fig. 8 a and Fig. 8 b, and in yet another embodiment, each pixel unit P includes first area P1
With second area P2, each first electrode 24a and each second electrode 25a in the first area with each pixel unit P
The corresponding position P1 is formed as patterned first comb electrode, each first electrode 24a and each second electrode 25a
Be formed as patterned second comb electrode in position corresponding with the second area P2 of each pixel unit P, first comb
The electrode strip of shape electrode has different extending directions from the electrode strip of second comb electrode.Specifically, first pectination electricity
The electrode strip of pole and the angle theta 1 of horizontal direction can be 0 °~45 °, for example, 7 °；The electrode strip of second comb electrode and perpendicular
Histogram to angle theta 2 can be 0 °~45 °, for example, 7 °.The first alignment direction X1 is that along vertical direction, this second is matched
To direction X2 be along horizontal direction, at this time the liquid crystal display device can in left and right directions with realize wide viewing angle in up and down direction
Switching with comprehensive narrow viewing angle is shown.
Each pixel electrode 35 is preferably plane-shape electrode, i.e., each pixel electrode 35 is monolith planar structure, is not formed
Slit.
In the liquid crystal display device, public electrode 23 and pixel electrode 35 are respectively formed at two substrates 20,30 up and down
On, 90 ° of twisted arrangements are presented in liquid crystal molecule between upper and lower two substrates 20,30, are normal white mode when any voltage is not added
(normal white), the i.e. liquid crystal display device use the framework of twisted nematic (Twisted Nematic, TN).
It should be appreciated that in the present embodiment, only being illustrated and this implementation on first substrate 20 and the second substrate 30 in figure
The relevant film layer structure of example, is omitted with the incoherent film layer structure of the present embodiment.
Positive liquid crystal molecules, the i.e. liquid crystal molecule that is positive of dielectric anisotropy are used in liquid crystal layer 40.Original state (i.e.
Liquid crystal display device does not apply the situation of any voltage) under, the positive liquid crystal molecules in liquid crystal layer 40 are presented and substrate 20,30 bases
This parallel lying posture, the i.e. surface of long axis direction with substrate 20,30 of positive liquid crystal molecules are substantially parallel.In practical application
In, it can have lesser initial pre-tilt angle between the positive liquid crystal molecules in liquid crystal layer 40 and substrate 20,30, to accelerate liquid crystal
Response speed when molecule deflects.The range of the initial pre-tilt angle may be less than 10 degree.
First electrode 24 and second electrode 25 pass through control and apply for controlling liquid crystal display device progress view angle switch
Voltage in first electrode 24 and second electrode 25, the liquid crystal display device may be implemented in wide viewing angle mode and narrow viewing angle mould
Switching between formula.
Wide viewing angle mode: please join Fig. 9 a and Fig. 9 b, when wide viewing angle is shown, apply direct current common voltage DC to public electrode 23
Vcom (DC Vcom is, for example, 0V), at the same apply respectively to first electrode 24 and second electrode 25 it is identical as public electrode 23 or
Similar voltage makes the voltage difference between first electrode 24 and public electrode 23 and between second electrode 25 and public electrode 23
Respectively less than preset value (being, for example, less than 0.5V), i.e., between first electrode 24 and public electrode 23 and second electrode 25 and common electrical
Voltage difference is not present between pole 23 or there are small electric pressure differences, the liquid crystal display device realizes that normal wide viewing angle is shown at this time.
Under wide viewing angle mode, when not applying any data voltage on pixel electrode 35, pixel electrode 35 and common electrical
Voltage difference between pole 23 is zero, and liquid crystal molecule keeps initial twisting gesture between first substrate 20 and the second substrate 30,
The light being emitted from lower polarizer can pass through upper polarizer, which is presented white state, as illustrated in fig. 9；Work as pixel electrode
When applying data voltage on 35, voltage difference between pixel electrode 35 and public electrode 23 is greater than zero, at this time pixel electrode 35 with
Vertical direction electric field is generated between public electrode 23, liquid crystal molecule tilts under the action of vertical electric field, when pressure difference reaches certain
After value, the liquid crystal molecule tilted at a certain angle will make the light being emitted from lower polarizer can not be through upper polarizer, the liquid crystal
Black state is presented in showing device, as shown in figure 9b；Adjust the size for the data voltage being applied on pixel electrode 35, liquid crystal display dress
Different shade of gray can be shown by setting.
Under wide viewing angle mode, between first electrode 24 and public electrode 23 and second electrode 25 and public electrode 23 it
Between voltage difference can be between 0V~0.5V.Preferably, apply in first electrode 24 and second electrode 25 and public electrode
23 identical voltages, so that the electricity between first electrode 24 and public electrode 23 and between second electrode 25 and public electrode 23
Pressure difference is zero, and preferable wide viewing angle display effect may be implemented.
Narrow viewing angle mode: please join Figure 10 a and Figure 10 b, when narrow viewing angle is shown, apply direct current common voltage to public electrode 23
DC Vcom (DC Vcom is, for example, 0V), while applying on centered on direct current common voltage DC Vcom to first electrode 24
First alternating voltage V1 of below-center offset applies the upper below-center offset centered on direct current common voltage DC Vcom to second electrode 25
The second alternating voltage V2, make between first electrode 24 and public electrode 23 and between second electrode 25 and public electrode 23
Voltage difference is all larger than preset value (being greater than 3V), i.e., between first electrode 24 and public electrode 23 and second electrode 25 and public
There are larger voltage differences between common electrode 23, can form stronger level close to the region of liquid crystal layer 40 in first substrate 20 at this time
Electric field, and the data voltage applied on the pixel unit P that is covered of the polarity of first alternating voltage V1 and first electrode 24
Polarity on the contrary, the data electricity applied in the polarity and the pixel unit P that is covered of second electrode 25 of second alternating voltage V2
The polarity of pressure is on the contrary, can increase between first electrode 24 and pixel electrode 35 and between second electrode 25 and pixel electrode 35
Voltage difference, stronger vertical electric field can be also further formed between first substrate 20 and the second substrate 30, liquid crystal molecule exists
It deflects under the collective effect of the horizontal component of electric field and the vertical electric field, leads to light leakage phenomena occur under the big visual angle of screen, compare
Degree reduces and visual angle reduces, and the liquid crystal display device is made to realize that narrow viewing angle is shown.
Under narrow viewing angle mode, when not applying any data voltage on pixel electrode 35, pixel electrode 35 and common electrical
Voltage difference between pole 23 is zero, and the liquid crystal molecule with 25 opposite position of first electrode 24 and second electrode can be with certain angle
Degree tilts, and the liquid crystal molecule in remaining region still keeps initial twisting gesture, which is presented white state, such as Figure 10 a
It is shown；When applying data voltage on pixel electrode 35, the voltage difference between pixel electrode 35 and public electrode 23 is greater than zero, this
When pixel electrode 35 and public electrode 23 between generate vertical direction electric field so that the electric-field enhancing in vertical direction, entire area
Liquid crystal molecule in domain tilts angle and increases, which is presented black state, as shown in fig. lob；Adjustment is applied to pixel
The size of data voltage on electrode 35, the liquid crystal display device can show different shade of gray.
Under narrow viewing angle mode, between first electrode 24 and public electrode 23 and second electrode 25 and public electrode 23 it
Between voltage difference can be between 3V~7V.For example, between first electrode 24 and public electrode 23 and second electrode 25 and public
Voltage difference between common electrode 23 can be 6V, and preferable narrow viewing angle display effect may be implemented.
Incorporated by reference to Figure 11 and Figure 12, under narrow viewing angle mode, the polarity and second alternating current of first alternating voltage V1
Press the polarity of V2 on the contrary, and the first alternating voltage V1 and second alternating voltage V2 the every frame reversion of polarity it is primary.
As shown in figure 11, under narrow viewing angle mode, when using the liquid crystal display device of framework shown in Fig. 2, each first
Electrode strip 24a and each second electrode 25a are covered each by one-row pixels unit P, and the liquid crystal display device takes row at this time
It is driven reverse.Wherein, in nth frame, the polarity of first alternating voltage V1 is negative polarity, at this time each first electrode 24a institute
The polarity of the data voltage applied on each row pixel unit P of covering is positive polarity；In N+1 frame, first alternating voltage V1
It is transformed to positive polarity, the data voltage applied on each row pixel unit P that each first electrode 24a is covered at this time is transformed to
Negative polarity.Therefore, the number applied on each row pixel unit P that the polarity Yu first electrode 24 of first alternating voltage V1 is covered
It is exactly the opposite according to the polarity of voltage, it can so increase the voltage difference between first electrode 24 and pixel electrode 35.Likewise, should
The polarity of the data voltage applied on each row pixel unit P that the polarity and second electrode 25 of second alternating voltage V2 is covered
It is exactly the opposite, the voltage difference between second electrode 25 and pixel electrode 35 can be increased, to be conducive under narrow viewing angle mode
Stronger vertical electric field is formed between first substrate 20 and the second substrate 30, enhances narrow viewing angle display effect.
As shown in figure 12, under narrow viewing angle mode, when using the liquid crystal display device of framework shown in Fig. 4, each first
Electrode strip 24a and each second electrode 25a is covered each by a column pixel unit P, and the liquid crystal display device takes column at this time
It is driven reverse.Wherein, in nth frame, the polarity of first alternating voltage V1 is negative polarity, at this time each first electrode 24a institute
The polarity of the data voltage applied on each column pixel unit P of covering is positive polarity；In N+1 frame, first alternating voltage V1
It is transformed to positive polarity, the data voltage applied on each column pixel unit P that each first electrode 24a is covered at this time is transformed to
Negative polarity.Therefore, the number applied on each column pixel unit P that the polarity Yu first electrode 24 of first alternating voltage V1 is covered
It is exactly the opposite according to the polarity of voltage, it can so increase the voltage difference between first electrode 24 and pixel electrode 35.Likewise, should
The polarity of the data voltage applied on each column pixel unit P that the polarity and second electrode 25 of second alternating voltage V2 is covered
It is exactly the opposite, the voltage difference between second electrode 25 and pixel electrode 35 can be increased, to be conducive under narrow viewing angle mode
Stronger vertical electric field is formed between first substrate 20 and the second substrate 30, enhances narrow viewing angle display effect.
Under narrow viewing angle mode, the first ac voltage signal V1 and second ac voltage signal V2 can be identical class
The waveform of type, for example, square wave.
Figure 13 is the cross section structure schematic diagram of liquid crystal display device in second embodiment of the invention, please join Figure 13, this implementation
Example and the main distinction of above-mentioned first embodiment be, is additionally provided with third electrode 36 in the second substrate 30, pixel electrode 35 and the
Second insulating layer 37 is equipped between three electrodes 36, for third electrode 36 compared to pixel electrode 35 closer to liquid crystal layer 40, third is electric
Pole 36 is formed as patterned pectinate texture, third electrode 36 and public electrode in position corresponding with each pixel unit P
23 are conductively connected, such as in periphery non-display area, can be by conducting resinl (not shown) by third electrode 36 and public electrode 23
Conductive communication applies direct current common voltage DC Vcom identical with public electrode 23 always that is, on third electrode 36, in this way can be with
Electric field is further enhanced on the basis of the framework of above-mentioned first embodiment, promotes narrow viewing angle display effect.About the present embodiment
Other structures and view angle switch working principle may refer to above-mentioned first embodiment, and details are not described herein.
Liquid crystal display device and driving method provided by the invention, by the way that public electrode and first are arranged on the first substrate
Electrode and second electrode can control liquid crystal display dress by controlling the voltage being applied in first electrode and second electrode
Set between wide viewing angle and narrow viewing angle realize switching, thus without using Protective film, do not increase product thickness and production substantially
Under conditions of cost realize width view angle switch, have stronger operating flexibility and convenience, reach collection entertainment video with it is hidden
Private secrecy is in the Multifunctional liquid crystal display device of one.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
It is right according to the technical essence of the invention for the equivalent embodiment of equivalent variations, but without departing from the technical solutions of the present invention
Any simple modification, equivalent change and modification made by above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of liquid crystal display device, including first substrate (20), the second substrate being oppositely arranged with the first substrate (20)
(30) and the liquid crystal layer (40) between the first substrate (20) and the second substrate (30) it, is set on the first substrate (20)
There are public electrode (23), is limited by scan line (31) and data line (32) in the second substrate (30) and formed multiple pixel units
(P), pixel electrode (35) are equipped in each pixel unit (P), the liquid crystal layer (40) is closed on the first substrate (20) and is equipped with the
One alignment film (28), first alignment film (28) have the first alignment direction (X1), close on the liquid crystal in the second substrate (30)
Layer (40) is equipped with the second alignment film (38), which has the second alignment direction (X2), first alignment direction
(X1) vertical with the second alignment direction (X2), which uses positive liquid crystal molecules, which is characterized in that first base
It is additionally provided with and is located on the same floor and the first electrode of mutually insulated (24) and second electrode (25) on plate (20), the first electrode (24)
Including the multiple first electrode items (24a) being electrically connected, which includes multiple to be electrically connected
Two electrode strips (25a), multiple first electrode item (24a) and multiple second electrode item (25a) be parallel to each other interval and
It is alternately arranged, each first electrode item (24a) and each second electrode item (25a) are covered each by a line or a column pixel list
First (P).
2. liquid crystal display device according to claim 1, which is characterized in that each first electrode article (24a) and each
Two electrode strips (25a) extend each along horizontal direction and are covered each by one-row pixels unit (P)；Alternatively, each first electrode item
(24a) and each second electrode item (25a) extend each along vertical direction and are covered each by a column pixel unit (P).
3. liquid crystal display device according to claim 1, which is characterized in that each first electrode article (24a) and each
Two electrode strips (25a) are formed as patterned comb electrode in position corresponding with each pixel unit (P).
4. liquid crystal display device according to claim 3, which is characterized in that the electrode strip and horizontal direction of the comb electrode
0 °~45 ° of angle, first alignment direction (X1) be along vertical direction, second alignment direction (X2) be along level side
To；Alternatively, the electrode strip of the comb electrode and 0 °~45 ° of angle of vertical direction, which is along dampening
Square to, second alignment direction (X2) be along vertical direction.
5. liquid crystal display device according to claim 1, which is characterized in that each pixel unit (P) includes first area
(P1) and second area (P2), each first electrode item (24a) and each second electrode item (25a) with each pixel unit
(P) the corresponding position in first area (P1) is formed as patterned first comb electrode, each first electrode item (24a) and
Each second electrode item (25a) is formed as patterning in position corresponding with second area (P2) of each pixel unit (P)
The second comb electrode, 0 °~45 ° of angle of the electrode strip of first comb electrode and horizontal direction, second comb electrode
0 °~45 ° of angle of electrode strip and vertical direction, first alignment direction (X1) are second alignment direction along vertical direction
(X2) for along horizontal direction.
6. liquid crystal display device according to claim 1, which is characterized in that the public electrode (23) and the first electrode
(24), between second electrode (25) be equipped with the first insulating layer (26), the first electrode (24) and the second electrode (25) compared to
The public electrode (23) is closer to the liquid crystal layer (40).
7. liquid crystal display device according to claim 1, which is characterized in that be additionally provided with third electricity in the second substrate (30)
Pole (36) is equipped with second insulating layer (37) between the pixel electrode (35) and the third electrode (36), third electrode (36) phase
Compared with the pixel electrode (35) closer to the liquid crystal layer (40), the third electrode (36) is corresponding with each pixel unit (P)
Position be formed as patterned pectinate texture, the third electrode (36) and the public electrode (23) are conductive to be connected.
8. a kind of for driving the driving method of liquid crystal display device as described in any one of claim 1 to 7, feature exists
In the driving method includes:
Under wide viewing angle mode, apply direct current common voltage (DC Vcom) to the public electrode (23), to the first electrode (24)
Apply respectively with the second electrode (25) with the same or similar voltage of the public electrode (23), make the first electrode (24) with should
Voltage difference between public electrode (23) and between the second electrode (25) and the public electrode (23) is respectively less than preset value；
Under narrow viewing angle mode, apply direct current common voltage (DC Vcom) to the public electrode (23), to the first electrode (24)
The first alternating voltage (V1) for applying the upper below-center offset centered on the direct current common voltage (DC Vcom), to the second electrode
(25) the second alternating voltage (V2) for applying the upper below-center offset centered on the direct current common voltage (DC Vcom) makes first electricity
Voltage difference between pole (24) and the public electrode (23) and between the second electrode (25) and the public electrode (23) is big
It is applied in preset value, and on the pixel unit (P) that is covered with the first electrode (24) of the polarity of first alternating voltage (V1)
The polarity of the data voltage added is on the contrary, the pixel list that the polarity of second alternating voltage (V2) and the second electrode (25) are covered
The polarity of the data voltage applied on first (P) is opposite.
9. driving method according to claim 8, which is characterized in that under wide viewing angle mode, the first electrode (24) with
Voltage difference between the public electrode (23) and between the second electrode (25) and the public electrode (23) 0V~0.5V it
Between；Under narrow viewing angle mode, between the first electrode (24) and the public electrode (23) and the second electrode (25) and the public affairs
Voltage difference between common electrode (23) is between 3V~7V.
10. driving method according to claim 8, which is characterized in that the polarity of first alternating voltage (V1) and this
The polarity of two alternating voltages (V2) is on the contrary, the every frame of the polarity of first alternating voltage (V1) and second alternating voltage (V2) is anti-
Turn primary, when each first electrode item (24a) and each second electrode item (25a) are covered each by one-row pixels unit (P),
The liquid crystal display device is line inversion driving, when each first electrode item (24a) and each second electrode item (25a) are covered respectively
When one column pixel unit (P) of lid, which is column inversion driving.
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