CN209417475U - A kind of passive drive liquid crystal display and passive drive liquid crystal display module - Google Patents
A kind of passive drive liquid crystal display and passive drive liquid crystal display module Download PDFInfo
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- CN209417475U CN209417475U CN201821843861.6U CN201821843861U CN209417475U CN 209417475 U CN209417475 U CN 209417475U CN 201821843861 U CN201821843861 U CN 201821843861U CN 209417475 U CN209417475 U CN 209417475U
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Abstract
The utility model relates to a kind of passive drive liquid crystal display and passive drive liquid crystal display module, including the first polaroid with optical compensation, the first ITO electrically-conductive backing plate, the first vertically oriented layer, liquid crystal layer, the second vertically oriented layer, the 2nd ITO electrically-conductive backing plate and the second polaroid with optical compensation set gradually from top to bottom.The utility model forms that anaclasis is oval or the optical compensation films of ball with liquid crystal molecule the first polaroid and the second polaroid are laminating, chiral molecules is adulterated in liquid crystal, there is distorted-structure between liquid crystal molecule, liquid crystal layer has certain optical path delay amount, higher steepness and contrast are shown, meets passive high number driving and requires.
Description
Technical field
The utility model relates to a kind of liquid crystal display more particularly to a kind of passive drive liquid crystal display and passive drives
Liquid crystal display die set.
Background technique
Negative aobvious vertical alignment-type liquid crystal display has ater background, the display effect of high contrast, by consumer
Like, be widely applied in the fields such as industry control, smart home electric appliance, vehicle-mounted, the early stage display technology of vertical orientation vertically takes from TFT
To (active matrix driving) shifting value in passive drive field, the limitation of the technology of former TFT vertical orientation can not promote passive drive
Number is driven, causes to be confined to segment encode mode, display information content is very limited.As the application of intelligence and Internet of Things is added, to aobvious
Show that information content is put forward new requirements, needs increase resolution to 240*128 (i.e. 128 tunnels driving), it is existing vertically oriented aobvious
Show that technology is obviously unable to satisfy, needs to restudy and design the vertically oriented display technology for matching passive high route driving.
Existing liquid crystal display mode has very much, e.g., vertically aligned liquid crystal display (i.e. Vertical Alignment
Liquid Crystal Display, abbreviation vertical orientation-LCD), this liquid crystal display device is between two orthogonal polarizers
When work, available extremely perfect black state.But after applying voltage more than threshold voltage, the director of liquid crystal molecule only has
Deformation is tilted without twist distortion, so its steepness is poor, and in the chiral homeotropic alignment liquid crystal box of doping, chiral molecules
With the effect of surface orientation, so that liquid crystal molecule is from a surface to the existing inclination deformation in another surface, and there is distortion to rotate.
So the perfect blackness of the existing vertical alignment liquid crystal display part of chiral vertical alignment liquid crystal display part, and have aligned twisted
The high steepness of liquid crystal display device makes it possible in the display device application for passive high driving number.But this device
Part light leakage on angle of squint is serious, so to solve the leakage problem of compensation angle of squint.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is to provide a kind of passive drive liquid crystal displays
And passive drive liquid crystal display module, compensate the light leakage of angle of squint, available good view effect.
To achieve the above object, the utility model can be achieved by the following technical programs:
A kind of passive drive liquid crystal display, including set gradually from top to bottom the first polaroid with optical compensation,
First ITO electrically-conductive backing plate, the first vertically oriented layer, liquid crystal layer, the second vertically oriented layer, the 2nd ITO electrically-conductive backing plate and with optics
Second polaroid of compensation, first polaroid and the second polaroid include the first polarisation successively pasted from top to bottom
Layer, the first optical compensation films and the second optical compensation films.
Further, the anaclasis elliptical shape ball of first optical compensation films meets nz> nx> ny, parameter is according to formula
Re1=(nx1-ny1) * d1,Re1 is 0nm~60nm, and Rth1 is -120nm~-180nm；
The anaclasis elliptical shape ball of second optical compensation films meets nz> nx=ny, parameter is according to formula Re2=(nx2-ny2) * d2,Re2 is that 0, Rth2 is -180nm~-250nm；Wherein Re1 and Re2 is respectively the first light
Phase difference in the face of compensation film and the second optical compensation films is learned, Rth1 and Rth2 are respectively the first optical compensation films and the second optics
The film thickness phase difference of compensation film, nx1 and nx2 be respectively the direction the x refractive index of the first optical compensation films and the second optical compensation films
Component, ny1 and ny2 be respectively the direction the y refractive index component of the first optical compensation films and the second optical compensation films, nz1 and nz2
The direction the z refractive index component of respectively the first optical compensation films and the second optical compensation films, d1 and d2 are respectively that the first optics is mended
Repay film and the second optical compensation effective film.
Further, the liquid crystal layer is vertically oriented negative liquid crystal.
Further, the optical path delay amount Δ nd of the liquid crystal layer is 440nm~1400nm.
Further, the liquid crystal layer adulterates chiral molecules.
A kind of passive drive liquid crystal display module, including above-mentioned passive drive liquid crystal display, the of the display
The both ends of one ITO electrically-conductive backing plate pass through connector respectively and passive high number driving IC is electrically connected, and the passive high number is driven
Dynamic IC setting is on the control unit.
A kind of passive drive liquid crystal display module, including above-mentioned passive drive liquid crystal display, the of the display
One end of one ITO electrically-conductive backing plate and passive high number driving IC are electrically connected, one end of connector and the first ITO conductive base
Plate is electrically connected, and the other end and control unit are electrically connected.
Compared with prior art, the utility model is formed with liquid crystal molecule the first polaroid and the second polaroid are laminating
The optical compensation films of anaclasis ellipse or ball, chiral molecules is adulterated in liquid crystal, there is distorted-structure, liquid crystal layer between liquid crystal molecule
With certain optical path delay amount, higher steepness and contrast are shown, meets passive high number driving and requires, realize high-resolution
Rate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the passive drive liquid crystal display of the utility model；
Fig. 2 (a) Fig. 2 (b) is two kinds of structural schematic diagrams of the first polaroid/second polaroid of the utility model；
Fig. 3 (a) Fig. 3 (b) is liquid crystal molecule working principle diagram；
Fig. 4 is the working principle diagram of Fig. 1；
Fig. 5 (a) is the electro-optical characteristic curves figure of 88 ° of distortions of the passive drive liquid crystal display of the utility model；
Fig. 5 (b) is the electro-optical characteristic curves figure of 88 ° of distortions of prior art liquid crystal display；
Fig. 6 (a) is the response time figure of 88 ° of distortions of the passive drive liquid crystal display of the utility model；
Fig. 6 (b) is the response time figure of 88 ° of distortions of prior art liquid crystal display；
Fig. 7 (a) be 88 ° of the passive drive liquid crystal display of the utility model distortions etc. contrasts visual angle figure；
Fig. 7 (b) be 88 ° of prior art liquid crystal display distortions etc. contrasts visual angle figure；
Fig. 8 is the structural schematic diagram one of the passive drive liquid crystal display module of the utility model；
Fig. 9 is the passive drive liquid crystal display module structural schematic diagram two of the utility model；
In figure: 1, the first polaroid；2, the first ITO electrically-conductive backing plate；3, the first vertically oriented layer；4, liquid crystal layer；5, second
Vertically oriented layer；6, the 2nd ITO electrically-conductive backing plate；7, the second polaroid；8, the first polarizing layer；9, the first optical compensation films；10,
Two optical compensation films；11, connector；12, passive high number drives IC；13, control unit.
Specific embodiment
The utility model is further described below in conjunction with attached drawing and specific embodiment:
As shown in Figure 1, passive drive liquid crystal display described in the utility model, including the band set gradually from top to bottom
First polaroid 1 of optical compensation, the first the 2, first vertically oriented layer 3 of ITO electrically-conductive backing plate, the vertically oriented layer of liquid crystal layer 4, second
5, the 2nd ITO electrically-conductive backing plate 6 and the second polaroid 7 with optical compensation.
As shown in Fig. 2 (a), the first polaroid 1 and the second polaroid 7 include the first polarisation successively pasted from top to bottom
The 8, first optical compensation films 9 of layer and the second optical compensation films 10.The position of first optical compensation films 9 and the second optical compensation films 10
It can be interchanged, therefore as shown in Fig. 2 (b), the structure of the first polaroid 1 and the second polaroid 7 be can also be including from top to bottom
The first polarizing layer 1, the second optical compensation films 10 and the first optical compensation films 9 successively pasted.Wherein, the first optical compensation films 9
Anaclasis elliptical shape ball meet nz> nx> ny, parameter is according to formula Re1=(nx1-ny1) * d1,Wherein Re1 is phase difference in the face of the first optical compensation films 9, and Rth1 is the first optics benefit
The film thickness phase difference of film 9 is repaid, Re1 is 0nm~60nm, and Rth1 is -120nm~-180nm；The light of second optical compensation films 10 is rolled over
It penetrates elliptical shape ball and meets nz> nx=ny, parameter is according to formula Re2=(nx2-ny2) * d2,Re2 is phase difference in the face of the second optical compensation films 10, and Rth2 is the second optics benefit
The film thickness phase difference of film 10 is repaid, Re2 0, Rth2 are -180nm~-250nm, wherein nx1 and nx2 be respectively the first optical compensation
The direction the x refractive index component of film 9 and the second optical compensation films 10, ny1 and ny2 be respectively the first optical compensation films 9 and the second optics
The direction the y refractive index component of compensation film 10, nz1 and nz2 be respectively the side z of the first optical compensation films 9 and the second optical compensation films 10
To refractive index component, d1 and d2 are respectively the effective thickness of the first optical compensation films 9 and the second optical compensation films 10.
Optical compensation films are mainly that (angle of squint refers to direction of observation to light leakage of the compensation liquid crystal display in dark-state angle of squint
There is certain angle with vertical display normal to a surface).Liquid crystal molecule is perpendicular to substrate, according to optical indicatrix principle, nz
> nx=ny, when incident light vertical incidence, phase delay is not generated, so the light by the polarizer can not be by perpendicular
Analyzer, obtain perfect black state；When being powered on, when liquid crystal molecule electric field action overturns oblique incidence, light passes through liquid crystal
Layer 4 generates phase delay, becomes elliptically polarized light, and at this moment analyzer can not all absorb emergent light, will generate light leakage.It is right
In this light leakage.The refracting characteristic of the laminating upper optical compensation films of polaroid needs to meet nz< nx=ny, according to the following formula:
Repol=(nx pol-ny pol)*dpol,
WithWherein, Δ n=ne-noFor the birefringent system of liquid crystal
Number, neAnd noRespectively extraordinary ray refractive index and ordinary refraction index, d is the thickness of liquid crystal layer, when in the face of optical compensation films
Phase difference RepolWith film thickness phase difference RthpolWith the birefringent last and ovalisation of liquid crystal layer or ball, when light oblique incidence
When, light generates phase delay by liquid crystal layer, becomes elliptically polarized light, and at this moment analyzer can not all absorb emergent light, this
When optical compensation films will generate phase difference nz< nx=nyLight be modified, make emergent light still be linearly polarized light, analyzer will go out
It penetrates light all to absorb, so that angle of squint also available more perfect black state.
Liquid crystal layer 4 is preferably vertically oriented negative liquid crystal, i.e., the liquid crystal being negative using dielectric anisotropy.The light of liquid crystal layer
Journey retardation Δ nd is 440nm~1400nm.
The transmissivity formula of vertical alignment liquid crystal display are as follows:
I=I0[sin2(2β)sin2(Δψ/2)]
Wherein, I0For the incident intensity of polaroid, β is the folder between incident polarizing axis and liquid crystal cell front surface frictional direction
Angle, the π of Δ ψ=2 Δ nd/ λ are phase delay.Vertical alignment liquid crystal display work can obtain between two orthogonal polarizers
To relatively perfect black state and very high contrast.As shown from the above formula, to make output intensity reach maximum,(m
For odd number),(m is odd number) usually requires that optical path delay amount Δ nd increases a bit since driving voltage is limited, one
As be(m is odd number).So when incident light is 550nm, m=1, Δ nd=330nm；M=3, Δ nd
=880nm ... can choose appropriate retardation as needed.
Some researches show that when the parameter of liquid crystal determines, with the increase of thickness of liquid crystal layer, the steepness of electrooptic effect is more next
It is steeper, so the retardation of liquid crystal device is larger, but liquid crystal layer is blocked up to influence whether device to for driving under high duty ratio
The response speed of part, so thickness of liquid crystal layer is selected, then the double refractive inde of liquid crystal then need it is bigger.Liquid crystal layer it is total
Retardation Δ nd=800nm~1100nm is preferable.
Preferably, liquid crystal layer 4 adulterates chiral molecules.More demanding, the voltage of illuminated state and dark-state of height driving number driving
Window is very narrow, this just needs liquid crystal device to have good steepness, and general negative liquid crystal is extremely difficult to, so needing to add chiral point
Son makes it that can possess STN mode preferable steepness in the state of making alive.Chiral molecules is to vertically oriented liquid crystal molecule
It does not work, when liquid crystal molecule is no longer vertical, chiral molecules will be such that liquid crystal molecule distorts, liquid crystal layer schematic diagram such as Fig. 3
(a) Fig. 3 (b).The steepness of electrooptic effect is related with torsion characteristic in liquid crystal molecule splay, it is well known that the liquid crystal cell of STN mode
Steepness with the increase of distortion angle and steepening, substantially liquid crystal be doped with after twist chiral material splay and torsion characteristic to
The variation that advantageous steepness is promoted.The chiral existing splay deformation of vertical liquid crystal display has twist distortion, steepness and distortion bullet again
Property coefficient is related with the ratio of Splay elastic constant, i.e., steepness withBecome smaller and steepening.So aobvious in homeotropic alignment liquid crystal
Show and chiral molecules is added in device, it is made to generate distortion rotation to improve its high number driving capability.The pass of steepness and driving number
System such as following formula:Wherein, N indicates that row driving electrodes number, γ indicate steepness.From the above equation, we can see that as row drives
The increase of number of electrodes, steepness can tend to 1, when such as N=128, γ ≈ 1.09.
As shown in figure 4, the polarization direction of the first polaroid 1 and the angle of the first 3 frictional direction of vertically oriented layer are 45 °
(or -45 °), the polarization direction of the second polaroid 7 are vertical with the polarization direction of the first polaroid 1.When not applying driving voltage,
Liquid crystal molecule is arranged perpendicular to substrate surface, and incident light penetrates the first polaroid 1, becomes linearly polarized light, polarization direction and first
The polarization direction of polaroid 1 is consistent, because the optical axis of uniaxial liquid crystal is consistent with the long axis of liquid crystal molecule, the direction of propagation of light
It is parallel with the long axis of liquid crystal molecule, do not occur birefringent, cannot penetrate the second polaroid 7 yet.But when applied voltage is more than
When threshold voltage, other than the liquid crystal molecule near the first vertically oriented layer 3 and the second 5 surface of vertically oriented layer, remaining fluid
The long axis of brilliant molecule can all tilt certain angle, θ, which increases with the increase of voltage, simultaneously because the work of chiral molecules
With also liquid crystal molecule being made to distort certain angle by the hand of spiral of chiral moleculesThe folder of total distortion angle and friction
Angle is consistent, at this moment incident light through the first polaroid 1 generate linearly polarized light enter liquid crystal layer 4 when can occur it is birefringent, then
Through the second polaroid 7 it will become linearly polarized light again, only 90 ° of change of polarized direction.When this display combines off state
The high steepness of STN-LCD when the blackness and on state of vertical orientation-LCD, so being suitble to the driving of higher row driving electrodes number.
The liquid crystal display of high row driving electrodes number has the advantages that low-voltage high contrast, the electricity of this liquid crystal display
Pressure can accomplish lower threshold voltage, saturation voltage also with threshold voltage very close to.And vertical alignment-type liquid crystal shows utensil
There is good blackness, in the lower situation of voltage, this blackness is best, and illuminated state also has higher brightness, it is possible to obtain
Good contrast.
The utility model is laminating oval or round with liquid crystal molecule formation anaclasis in the first polaroid and the second polaroid
The optical compensation films of ball adulterate chiral molecules in liquid crystal, there is distorted-structure between liquid crystal molecule, and there is liquid crystal layer certain light path to prolong
Chi Liang shows higher steepness and contrast, meets passive high number driving and requires.
Illustrate the present embodiment in order to clearer, will test according to the above description below.
The parameter of liquid crystal display is as follows:
The frictional direction of the vertically oriented layer of the first of liquid crystal display is 45 °, and a first vertically oriented layer frictional direction is
45 °, the direction of the first polaroid is 0 °, and the direction of the second polaroid is 90 °, structure chart such as Fig. 4.This display combines vertical
The perfect blackness of straight alignment-type liquid crystal display and the high steepness of STN type liquid crystal display.When driving is gone on our 128 tunnels Yong,
Good illuminated state has been arrived on state, has also obtained preferable black state in off state.
Use the photoelectric curve of LCT-V2000 (manufactured by the liquid crystal ray machine of Changchun) photoelectricity test instrument test display, response
Time, contrast and contrasts visual angle figure is waited, as shown in Fig. 5 (a) -7 (a), test data is as follows:
Photoelectric characteristic curve such as Fig. 5 (a) Fig. 5 (b), it can be seen from the figure that the liquid crystal display of the utility model is steep
Very steep, steepness 1.24 is spent, the steepness than general negativity vertical alignment-type liquid crystal display is steep, can be adapted for high driving
The liquid crystal device of circuit.
Response time such as Fig. 6 (a) Fig. 6 (b), it can be seen from the figure that when the response of the liquid crystal display of the utility model
Between be also than faster, response time 265.2ms, so the utility model does not influence the response time of display.
Etc. contrasts visual angle such as Fig. 7 (a) Fig. 7 (b), it can be seen from the figure that the contrast of the utility model centre visual angle
Maximum, maximum-contrast 600:1, contrast or very high, while being made by compensation way used in the utility model
The liquid crystal display for obtaining the utility model possesses preferable visual angle.
A kind of passive drive liquid crystal display module, including above-mentioned passive drive liquid crystal display, the first ITO of display
The both ends of electrically-conductive backing plate 2 pass through connector 11 respectively and passive high number driving IC12 is electrically connected (bonding), passive high number
Drive IC12 setting (bonding) in control unit 13.
A kind of passive drive liquid crystal display module, including above-mentioned passive drive liquid crystal display, the first ITO of display
One end of electrically-conductive backing plate 2 and passive high number driving IC12 are electrically connected (bonding), and one end of connector 11 is led with the first ITO
Electric substrate is electrically connected (bonding), and the other end and control unit 13 are electrically connected (bonding).
It is two kinds of control modes of passive liquid crystal display mould group above.
For those skilled in the art, it is various corresponding that other can be made according to above technical scheme and design
Change and deformation, and all these change and modification all should belong to the utility model claims protection scope it
It is interior.
Claims (7)
1. a kind of passive drive liquid crystal display, it is characterised in that: including with optical compensation set gradually from top to bottom
One polaroid, the first ITO electrically-conductive backing plate, the first vertically oriented layer, liquid crystal layer, the second vertically oriented layer, the 2nd ITO electrically-conductive backing plate
With the second polaroid with optical compensation, first polaroid and the second polaroid include successively pasted from top to bottom
One polarizing layer, the first optical compensation films and the second optical compensation films.
2. passive drive liquid crystal display according to claim 1, it is characterised in that: the light of first optical compensation films
Refraction elliptical shape ball meets nz> nx> ny, parameter is according to formula Re1=(nx1-ny1) * d1,Re1 is 0nm~60nm, and Rth1 is -120nm~-180nm；The light of second optical compensation films
Refraction elliptical shape ball meets nz> nx=ny, parameter is according to formula Re2=(nx2-ny2) * d2,Re2 is that 0, Rth2 is -180nm~-250nm；Wherein Re1 and Re2 is respectively the first light
Phase difference in the face of compensation film and the second optical compensation films is learned, Rth1 and Rth2 are respectively the first optical compensation films and the second optics
The film thickness phase difference of compensation film, nx1 and nx2 be respectively the direction the x refractive index point of the first optical compensation films and the second optical compensation films
Amount, ny1 and ny2 be respectively the direction the y refractive index component of the first optical compensation films and the second optical compensation films, nz1 and nz2 difference
For the direction the z refractive index component of the first optical compensation films and the second optical compensation films, d1 and d2 are respectively the first optical compensation films
With the second optical compensation effective film.
3. passive drive liquid crystal display according to claim 1, it is characterised in that: the liquid crystal layer is vertically oriented negative
Property liquid crystal.
4. passive drive liquid crystal display according to claim 1, it is characterised in that: the optical path delay amount of the liquid crystal layer
Δ nd is 440nm~1400nm.
5. passive drive liquid crystal display according to claim 1-4, it is characterised in that: the liquid crystal layer doping
Chiral molecules.
6. a kind of passive drive liquid crystal display module, it is characterised in that: including the described in any item passive drives of claim 1-4
Liquid crystal display, the both ends of the first ITO electrically-conductive backing plate of the display pass through connector and passive high number driving IC respectively
It is electrically connected, the passive high number driving IC setting is on the control unit.
7. a kind of passive drive liquid crystal display module, it is characterised in that: including the described in any item passive drives of claim 1-4
Liquid crystal display, one end of the first ITO electrically-conductive backing plate of the display and passive high number driving IC are electrically connected, connector
One end and the first ITO electrically-conductive backing plate be electrically connected, the other end and control unit are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821843861.6U CN209417475U (en) | 2018-11-09 | 2018-11-09 | A kind of passive drive liquid crystal display and passive drive liquid crystal display module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821843861.6U CN209417475U (en) | 2018-11-09 | 2018-11-09 | A kind of passive drive liquid crystal display and passive drive liquid crystal display module |
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| Publication Number | Publication Date |
|---|---|
| CN209417475U true CN209417475U (en) | 2019-09-20 |
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ID=67933551
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| CN201821843861.6U Active CN209417475U (en) | 2018-11-09 | 2018-11-09 | A kind of passive drive liquid crystal display and passive drive liquid crystal display module |
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| Country | Link |
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| CN (1) | CN209417475U (en) |
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2018
- 2018-11-09 CN CN201821843861.6U patent/CN209417475U/en active Active
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Inventor after: Wu Zirong Inventor after: Wang Qiusheng Inventor before: Wu Zirong Inventor before: Wang Qiusheng Inventor before: Chen Congxin |
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