CN101441365B - Bistable state liquid crystal display apparatus - Google Patents
Bistable state liquid crystal display apparatus Download PDFInfo
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- CN101441365B CN101441365B CN2008101802517A CN200810180251A CN101441365B CN 101441365 B CN101441365 B CN 101441365B CN 2008101802517 A CN2008101802517 A CN 2008101802517A CN 200810180251 A CN200810180251 A CN 200810180251A CN 101441365 B CN101441365 B CN 101441365B
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- liquid crystal
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Abstract
The invention discloses a bistable crystal display device and a driving method thereof, which is an LCD with the dual-frequency liquid crystal molecules. The driving method sends a first driving signal with a first frequency for the signal source of the LCD to make the liquid crystal molecules form a stable inclined straightforward state after stopping the first driving signal, and sends a second driving signal with a second frequency which is combined with the first frequency to make the liquid crystal molecules form stable torsion state after stopping the second driving signal. The liquid crystal molecules are in the conversion of two stable states i.e. the inclined straightforward state and the torsion state through the conversion of the driving signals in the different frequency combination and further the image of the display device presents dark or bright.
Description
The application is that application number is 200510064720.5, the applying date is on April 18th, 2005, denomination of invention is divided an application for the application for a patent for invention of " a kind of bistable state liquid crystal display apparatus and driving method thereof ".
Technical field
The present invention relates to a kind of bistable state liquid crystal display apparatus and driving method thereof, it mainly is conversion by the drive signal of two kinds of different frequency combinations, make liquid crystal molecule in the liquid crystal layer present to tilt the forward conversion of state and two kinds of steady state (SS)s of twisting states, in order to the dark attitude and the bright attitude of display frame.
Background technology
(Liquid Crystal Display, LCD), particularly (Thin Film Transistor, TFT) display (TFT LCD) extensively applies on the electronic products such as personal computer, notebook computer thin film transistor (TFT) LCD at present.Though and the TFT dealer preponderates, on products such as undersized product such as PDA, e-book, still there are many problems that can't overcome such as power consumption height, thickness be big on large size panel.
It is low-voltage driving that liquid crystal display is known as, but in fact also can not lump together, under the multichannel drive condition, diminished because each pixel takes up space, the actual driving voltage of its integral panels (being Vee) sometimes up to tens volts to twenties volts.And picture PDLC, the driving voltage of multistable (MLCD) liquid crystal etc. may need up to tens volts the voltage to the hectovolt spy because of flow of liquid crystal (flow) effect.
And for example bistable nematic LCD (Bistable Twist Nematic CrystalDisplay, BTN LCD) is that a kind of changeable liquid crystal molecule is in bistable LCD, so its power consumption low (low power consumption).The bistable nematic liquid crystal molecule is needing to dispose an anchor to power layer (asymmetric anchoring energy substrates) on alignment film up and down for keeping this due form on the device.More there is the combination sample attitude that to use two kinds of voltages simultaneously to come generation level (horizontal) and vertical (vertical) electric field to make two of liquid crystal molecule reverse the attitude conversion and keeps its stable state with a kind of voltage sample attitude.
But this anchor is that the picture on surface of an exquisiteness is arranged (micro-patternedsurface) to the power layer, for requiring mass-produced display industry, this anchor is set will spends many costs at equipment with keeping on its qualification rate to the power layer.And reverse the attitude conversion because of two of liquid crystal molecule and must destroy the anchor of this anchor between power layer and liquid crystal molecule, therefore need destroy this anchor to power by a high voltage electric field to power.
Summary of the invention
For addressing the aforementioned drawbacks, fundamental purpose of the present invention is to provide a kind of type of drive, wherein convertible dual-frequency liquid crystal (dual frequency liquid crystal) molecule is in forward state (tilted-homeotropic state of a kind of inclination, TH state) and a kind of twisting states (twisted state, T state).
Secondary objective of the present invention is that the type of drive that is provided can make this bistable state liquid crystal display apparatus keep liquid crystal molecule and not need to have the one dimension voltage of random sample attitude that keeps steady again when stable state, for display device power saving more.
A further object of the present invention is that the present invention only needs general friction technology (rubbingtechnique) to form alignment film, and do not need further on alignment film, to dispose an anchor to the power layer, so the present invention is suitable for a large amount of productions, simultaneously do not need a high voltage electric field to destroy the anchor of this anchor between power layer and liquid crystal molecule to power yet, will be more efficient for the utilization of display device electric energy.
A further object of the present invention is that the driving method that is provided is a kind of combination of frequency conversion, because apparatus of the present invention do not need anchor to the power layer yet, so need only want a small voltage (as voltage 5V) just can reach the conversion that liquid crystal molecule presents two kinds of steady state (SS)s, demonstrate the dark attitude and the bright attitude of picture by this.
Comprise a upper substrate and an infrabasal plate according to apparatus of the present invention, this upper substrate and the corresponding setting mutually of this infrabasal plate; Polaroid and polaroid once on one, polaroid and this time polaroid are located at the another side of corresponding of this upper substrate and infrabasal plate respectively on this; Two transparent electrode layers, two electrode layers are located at this upper substrate and this infrabasal plate corresponding respectively; Two both alignment layers, two both alignment layers are located at corresponding of two electrode layers respectively; One liquid crystal layer, this liquid crystal layer is located between two both alignment layers, and this liquid crystal layer is laid with a plurality of dual-frequency liquid crystal molecules (dualfrequency liquid crystal).Wherein, the tilt angle of two both alignment layers is between 45～89 degree, and the ratio of the thickness of this liquid crystal layer and the distortion spacing of a liquid crystal molecule is 0.8 to 1.05.
Perhaps, the liquid crystal layer between this upper and lower substrate is laid with a plurality of dual-frequency liquid crystal molecules and dichroic dye (dichromatic dye), will need not be provided with aforesaid polaroid according to liquid crystal indicator of the present invention like this.
Cooperate driving method of the present invention again, send one first drive signal, and the frequency of this first drive signal is a first frequency, and this first frequency drives the liquid crystal molecule in this liquid crystal layer by a signal source; After this signal source stops to send this first drive signal, make liquid crystal molecule in this liquid crystal layer form forward state of a stable inclination, and, this signal source is sent one second drive signal, and this second drive signal is that this first frequency is in conjunction with a second frequency that is right after thereafter, this first frequency is different frequencies with this second frequency, so that the liquid crystal molecule of this liquid crystal layer is subjected to the driving of this second drive signal; After this signal source stops to send this second drive signal, make the liquid crystal molecule in this liquid crystal layer form a stable twisting states.
The conversion of the drive signal by the combination of two kinds of different frequencies like this makes liquid crystal molecule in the liquid crystal layer present to tilt the forward conversion of state and two kinds of steady state (SS)s of twisting states, demonstrates the dark attitude and the bright attitude of pixel by this.
Description of drawings
Fig. 1 is the synoptic diagram according to liquid crystal indicator of the present invention.
Fig. 2 is the synoptic diagram according to another liquid crystal indicator of the present invention.
Fig. 3 is the conversion of two kinds of drive signals, causes liquid crystal molecule to present to tilt the forward synoptic diagram of state and twisting states conversion.
Fig. 4 is that twisting states of the present invention forwards the forward transmittance of state and the coordinate synoptic diagram of voltage to.
Fig. 5 be inclination of the present invention forward state forward the transmittance of twisting states and the coordinate synoptic diagram of voltage to.
Fig. 6 is the pixel synoptic diagram that the present invention respectively changes attitude when being light source with He-Ne laser.
Embodiment
Relevant detailed content of the present invention and technical descriptioon, existing accompanying drawings is as follows:
Seeing also shown in Figure 1ly, is the synoptic diagram of liquid crystal indicator of the present invention.The present invention is a kind of bistable state liquid crystal display apparatus, is the liquid crystal indicator that is driven by the drive signal that different frequency makes up, and this device comprises: a upper substrate 11 and an infrabasal plate 12, this upper substrate 11 and these infrabasal plate 12 mutual corresponding settings; And this upper substrate 11 and the corresponding surface of infrabasal plate 12 respectively are respectively equipped with tin indium oxide (indium tinoxide, ITO) electrode layer 21,22 of Xing Chenging of a transparent sample attitude; And coating (Coated) two is arranged at this electrode layer 21,22 apparent surfaces' both alignment layers 31,32 materials (as the RN-1338 of NissanChemicals Co. production) respectively, these both alignment layers 31,32 materials can be one of them of friction matching material and light alignment materials, and wherein the tilt angle of this both alignment layers 31,32 is between 45～89 degree.
Polaroid 41 and polaroid 42 once on one, polaroid 41 and this time polaroid 42 are located at the another side of 12 corresponding of this upper substrate 11 and infrabasal plates respectively on this.Wherein the absorption axes angle of this upper and lower polaroid 41,42 is between 80～100 degree.And the alignment direction angle of the both alignment layers 31 of the absorption axes of this last polaroid 41 and upper substrate 11 is between 0～180 degree.
One liquid crystal layer 50, this liquid crystal layer 50 are located between two both alignment layers 31,32, and this liquid crystal layer 50 is laid with a plurality of dual-frequency liquid crystal molecules 51.This liquid crystal layer 50 can be the MLC-2048 that is produced as Merck Co., wherein this MLC-2048 a kind ofly has when frequency is low frequency (1KHz), permitivity aeolotropic (dielectric anisotropy) Δ ε=3.22, and when frequency is high-frequency (100KHz), the material of permitivity aeolotropic Δ ε=-3.4 characteristics.
(pitch is between ratio (d/p) p) can be 0.8 to 1.05 (0.8 ≦ d/p ≦ 1.05) according to the distortion spacing of the liquid crystal molecule 51 in the thickness (d) of this liquid crystal layer 50 of the present invention and the liquid crystal layer 50 again.
Please consulting shown in Figure 2ly again, is the synoptic diagram of another liquid crystal indicator of the present invention.This device comprises: a upper substrate 11 and an infrabasal plate 12, this upper substrate 11 and these infrabasal plate 12 mutual corresponding settings; And this upper substrate 11 and the corresponding surface of infrabasal plate 12 respectively are respectively equipped with the electrode layer 21,22 that the tin indium oxide of a transparent sample attitude forms; And coating two is arranged at this electrode layer 21,22 apparent surfaces' both alignment layers 31,32 materials (as the RN-1338 of NissanChemicals Co. production) respectively, these both alignment layers 31,32 materials can be one of them of friction matching material and light alignment materials, and wherein the tilt angle of this both alignment layers 31,32 is between 45～89 degree.
Be that with Fig. 1 difference this device need not be provided with polarisation equipment, but liquid crystal layer 50 materials of the MLC-2048 that will be produced as Merck Co. become another kind of liquid crystal layer 50 ' after adding dichroic dye, and promptly this liquid crystal layer 50 ' is laid with a plurality of dual-frequency liquid crystal molecules 51 and dichroic dye.Certainly, this liquid crystal layer 50 ' is possessed and is a kind ofly had when frequency is low frequency (1KHz) as described above, permitivity aeolotropic Δ ε=3.22, and when frequency is high-frequency (100KHz), the material of permitivity aeolotropic Δ ε=-3.4 characteristics.
Just utilize the guest_host effect in the photoelectric effect, has characteristic by this dichroic dye (for guest) at molecular long axis direction and short-axis direction visible absorption anisotropy, when being dissolved in the liquid crystal (being host) of certain arrangement with about 1/10 ratio, because of the dichroic dye that generally has long rod shape can be arranged in parallel with liquid crystal molecule 51, if when changing into liquid crystal molecule 51 arrangements of host, also can make as the dichroic dye molecules align of guest and do relevant variation, and the visible light absorption of may command and adjusting dyestuff, so this display device can not need to be provided with polarisation equipment.
Next seeing also shown in Figure 3ly, is the conversion of two kinds of drive signals, causes liquid crystal molecule to present to tilt the forward synoptic diagram of state and twisting states conversion.This liquid crystal indicator is provided with a signal source, and liquid crystal molecule 51 fall into disarray in the liquid crystal layer 50,50 ' at the beginning are because liquid crystal molecule 51 will be to tilt the sample attitude that forward state and twisting states coexist.But if send one first drive signal with this signal source, and the frequency of this first drive signal is a first frequency f
1, and this first frequency f
1Drive this and begin liquid crystal molecule 51 in the liquid crystal layer 50,50 '; After this signal source stops to send this first drive signal, make liquid crystal molecule 51 in this liquid crystal layer 50,50 ' form forward state of a stable inclination.
And if this signal source is sent one second drive signal, and this second drive signal is this first frequency f
1In conjunction with a second frequency f who is right after thereafter
2(f
1With f
2), this first frequency f
1With this second frequency f
2Be different frequencies, so that this liquid crystal layer 50,50 ' liquid crystal molecule 51 are subjected to the driving of this second drive signal; After this signal source stops to send this second drive signal, make this liquid crystal layer 50,50 ' interior liquid crystal molecule 51 form a stable twisting states (twisting states).This first frequency f wherein
1Frequency than this second frequency f
2Low (as f
1=1KHz, f
2=100KHz), and this first frequency f
1The permitivity aeolotropic (Δ ε) that can cause the liquid crystal molecule 51 in this liquid crystal layer 50,50 ' on the occasion of.And the frequency of this second frequency f2 is than this first frequency f
1Height, and this second frequency f
2Can cause the permitivity aeolotropic (Δ ε) of the liquid crystal molecule 51 in this liquid crystal layer 50,50 ' to be negative value.
Cooperate two kinds of different frequency (f by aforesaid device
1, f
2) be combined into (f
1), (f
1With f
2) the conversion of two driving signal, will make liquid crystal molecule 51 in the liquid crystal layer 50,50 ' present to tilt the conversion of state forward and two kinds of steady state (SS)s of twisting states, with dark attitude and the bright attitude that demonstrates picture.
See also Fig. 4, existing is light source (wavelength 632.8nm) with a He-Ne laser, when using method and apparatus of the present invention to measure the pixel of display panel, when with a first frequency f
1First drive signal (5V) of (as: 1KHz) puts on the liquid crystal indicator, at this first frequency f
1Stage liquid crystal layer 50,50 ' interior liquid crystal molecule 51 will experience the variation of the transfer process formation optical phase difference of a bit of time, cause variation on the transmittance (transmittance) (as partially forward state (the bias homeotropicstate among Fig. 4, BH state)), and after first drive signal stops to apply, the liquid crystal molecule 51 in the liquid crystal layer 50,50 ' will form forward state of a stable inclination.As shown in Figure 4, can find partially forward state and tilt that forward state transmittance separately is very low, and all level off to 0 that just pixel presents black sample attitude (dark attitude).
The image of state presents shown in Fig. 6 (a) and (b) the liquid crystal molecule 51 that penetrates a pixel place at microscopically when white light with tilting forward for state partially forward, and picture is dark attitude.As for the state that why tilts forward not as partially forward state is black, be that state is a kind of form of approximate spiral inclination because tilt forward, and partially forward state is a kind of homeotropic alignment, and forward state is dark so the picture that forward state presented partially that should blink is than the inclination of stable state.
Please consult Fig. 5 again, same is light source (wavelength 632.8nm) with a He-Ne laser, when using method and apparatus of the present invention to measure the pixel of display panel, when having first frequency f earlier with one
1Again in conjunction with a second frequency f who is right after thereafter
2(f
1With f
2) second drive signal (5V) put on the liquid crystal indicator, at this first frequency f
1In (as: 1KHz) stage liquid crystal layer 50,50 ' liquid crystal molecule 51 will state transfers partially forward state to by tilting forward, this moment, transmittance was almost constant; Second drive signal that is right after enters second frequency f
2(as: 100KHz) stage, this frequency variation initially will cause the phenomenon that backflow (backflow) arranged in the liquid crystal layer 50,50 ', this backflow will cause the rotation of this liquid crystal layer 50,50 ' middle layer liquid crystal molecule 51, form the variation of optical phase difference, cause the projection phenomenon (optical bounce) on the transmittance.As shown in Figure 5, transmittance through the change of a utmost point short time after liquid crystal molecule 51 in this liquid crystal layer 50,50 ' will form and reverse sample attitude (bias twisted state partially, the BT state), and after second drive signal stops to apply, this liquid crystal layer 50,50 ' interior liquid crystal molecule 51 will form a stable twisting states, as shown in Figure 5, transmittance is all greater than 0 separately can to find to reverse partially sample attitude and twisting states, and just pixel is bright state (bright attitude).
The liquid crystal molecule 51 that penetrates a pixel place at microscopically when white light presents shown in Fig. 6 (c), (d) for the image that reverses sample attitude and twisting states partially, and picture is bright attitude.Again because He-Ne laser is a kind of laser of red, yellow, green three kinds of colors, wherein ruddiness is maximum, and reverse sample attitude band pink partially, and twisting states band green, so this reverses the sample attitude partially higher transmittance is arranged, and the picture that the sample attitude presented of reversing partially that should blink is bright than the twisting states of stable state.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (4)
1. bistable state liquid crystal display apparatus is characterized in that described device comprises:
One upper substrate (11) and an infrabasal plate (12), described upper substrate (11) and described infrabasal plate (12) corresponding setting mutually;
Polaroid on one (41) and polaroid (42) are once describedly gone up the another side that polaroid (41) and described polaroid (42) down are located at corresponding of described upper substrate (11) and infrabasal plate (12) respectively;
Two transparent electrode layers (21,22), described two electrode layers (21,22) are located at described upper substrate (11) and described infrabasal plate (12) corresponding respectively;
Two both alignment layers (31,32), described two both alignment layers (31,32) are located at corresponding of two electrode layers (21,22) respectively;
One liquid crystal layer (50), described liquid crystal layer (50) is located between described two both alignment layers (31,32), and described liquid crystal layer (50) is laid with a plurality of dual-frequency liquid crystal molecules (51),
The tilt angle of wherein said both alignment layers (31,32) between 45～89 the degree,
And the ratio of the distortion spacing of the thickness of described liquid crystal layer (50) and a liquid crystal molecule (51) is 0.8 to 1.05;
Wherein, described bistable state liquid crystal display apparatus sends one first drive signal by a signal source, and the frequency of described first drive signal is a first frequency (f1), and described first frequency (f1) drives the liquid crystal molecule (51) in the described liquid crystal layer (50);
After described signal source stops to send described first drive signal, make liquid crystal molecule (51) in the described liquid crystal layer (50) form forward state of a stable inclination;
Described signal source is sent one second drive signal, and described second drive signal is that described first frequency (f1) is in conjunction with a second frequency (f2) that is right after thereafter, described first frequency (f1) is different frequencies with described second frequency (f2), so that the liquid crystal molecule (51) of described liquid crystal layer (50) is subjected to the driving of described second drive signal;
After described signal source stops to send described second drive signal, make the liquid crystal molecule (51) in the described liquid crystal layer (50) form a stable twisting states.
2. bistable state liquid crystal display apparatus according to claim 1 is characterized in that the described absorption axes angle of polaroid (41) and following polaroid (42) of going up is between 80～100 degree.
3. bistable state liquid crystal display apparatus according to claim 1, the alignment direction angle that it is characterized in that the described absorption axes of going up polaroid (41) and the both alignment layers (31) that is disposed at described upper substrate (11) between 0～180 spend between.
4. bistable state liquid crystal display apparatus is characterized in that described device comprises:
One upper substrate (11) and an infrabasal plate (12), described upper substrate (11) and described infrabasal plate (12) corresponding setting mutually;
Two transparent electrode layers (21,22), described two electrode layers (21,22) are located at described upper substrate (11) and described infrabasal plate (12) corresponding respectively;
Two both alignment layers (31,32), described two both alignment layers (31,32) are located at corresponding of two electrode layers (21,22) respectively;
One liquid crystal layer (50 '), described liquid crystal layer (50 ') are located between described two both alignment layers (31,32), and described liquid crystal layer (50 ') is laid with a plurality of dual-frequency liquid crystal molecules (51) and dichroic dye,
Wherein, the tilt angle of described both alignment layers (31,32) between 45～89 the degree,
And the ratio of the distortion spacing of the thickness of described liquid crystal layer (50 ') and a liquid crystal molecule (51) is 0.8 to 1.05;
Wherein, described bistable state liquid crystal display apparatus sends one first drive signal by a signal source, and the frequency of described first drive signal is a first frequency (f1), and described first frequency (f1) drives the liquid crystal molecule (51) in the described liquid crystal layer (50 ');
After described signal source stops to send described first drive signal, make liquid crystal molecule (51) in the described liquid crystal layer (50) form forward state of a stable inclination;
Described signal source is sent one second drive signal, and described second drive signal is that described first frequency (f1) is in conjunction with a second frequency (f2) that is right after thereafter, described first frequency (f1) is different frequencies with described second frequency (f2), so that the liquid crystal molecule of described liquid crystal layer (50 ') (51) is subjected to the driving of described second drive signal;
After described signal source stops to send described second drive signal, make the liquid crystal molecule (51) in the described liquid crystal layer (50 ') form a stable twisting states.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101802517A CN101441365B (en) | 2005-04-18 | 2005-04-18 | Bistable state liquid crystal display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101802517A CN101441365B (en) | 2005-04-18 | 2005-04-18 | Bistable state liquid crystal display apparatus |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100647205A Division CN100510858C (en) | 2005-04-18 | 2005-04-18 | Double steady-state liquid-crystal display device and driving method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101441365A CN101441365A (en) | 2009-05-27 |
| CN101441365B true CN101441365B (en) | 2010-11-03 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5647875B2 (en) * | 2010-11-29 | 2015-01-07 | スタンレー電気株式会社 | Liquid crystal element, liquid crystal display device |
| CN102662274B (en) * | 2012-05-22 | 2015-07-01 | 深圳市华星光电技术有限公司 | Liquid crystal panel and liquid crystal alignment method thereof |
| CN109270750B (en) * | 2018-10-22 | 2021-08-27 | 信利半导体有限公司 | Pen-segment type bistable liquid crystal display screen and driving method thereof |
| CN109448661A (en) * | 2019-01-04 | 2019-03-08 | 深圳市华星光电技术有限公司 | Liquid crystal display device and its local dimming driving method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0131216A2 (en) * | 1983-07-12 | 1985-01-16 | BBC Brown Boveri AG | Liquid crystal display |
| CN87106251A (en) * | 1986-09-12 | 1988-05-04 | 霍夫曼-拉罗奇有限公司 | Lcd |
| US4909603A (en) * | 1987-03-14 | 1990-03-20 | Sharp Kabushiki Kaisha | Liquid crystal display element |
-
2005
- 2005-04-18 CN CN2008101802517A patent/CN101441365B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0131216A2 (en) * | 1983-07-12 | 1985-01-16 | BBC Brown Boveri AG | Liquid crystal display |
| CN87106251A (en) * | 1986-09-12 | 1988-05-04 | 霍夫曼-拉罗奇有限公司 | Lcd |
| US4909603A (en) * | 1987-03-14 | 1990-03-20 | Sharp Kabushiki Kaisha | Liquid crystal display element |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2004-163683A 2004.06.10 |
| JP特开平6-6222332A 1994.08.12 |
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