CN101441365B - Bistable state liquid crystal display apparatus - Google Patents

Bistable state liquid crystal display apparatus Download PDF

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CN101441365B
CN101441365B CN 200810180251 CN200810180251A CN101441365B CN 101441365 B CN101441365 B CN 101441365B CN 200810180251 CN200810180251 CN 200810180251 CN 200810180251 A CN200810180251 A CN 200810180251A CN 101441365 B CN101441365 B CN 101441365B
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liquid crystal
frequency
signal
crystal molecules
crystal layer
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CN101441365A (en
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刘锦璋
徐芝珊
梁宝芝
王淑霞
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胜华科技股份有限公司
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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 seconddriving 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

一种双稳态液晶显示装置 A bistable liquid crystal display device

[0001] 本申请是申请号为200510064720. 5、申请日为2005年4月18日、发明名称为“一 [0001] This application is a Patent Application No. 200510064720.5, filed April 18, 2005, entitled "a

种双稳态液晶显示装置及其驱动方法”的发明专利申请的分案申请。 Species divisional application bistable liquid crystal display device and a driving method "in the invention patent application.

技术领域 FIELD

[0002] 本发明涉及一种双稳态液晶显示装置及其驱动方法,主要是通过两种不同频率组合的驱动信号的转换,使液晶层内的液晶分子呈现倾斜顺向状态及扭转状态两种稳定状态的转换,用以显示画面的暗态及亮态。 [0002] The present invention relates to a bistable liquid crystal display device and a driving method, a driving signal is converted mainly by a combination of two different frequencies, the liquid crystal molecules of the liquid crystal layer exhibits two kinds of a state inclined forward and twisted state steady state conversion for the dark state of the display screen and the bright state.

背景技术 Background technique

[0003] 目前液晶显示器(Liquid Crystal Display,LCD),特别是薄膜晶体管(Thin Film Transistor, TFT)显示器(TFT IXD),已广泛运用于个人计算机、笔记本型计算机等电子产品上。 [0003] Currently on the LCD (Liquid Crystal Display, LCD), in particular a thin film transistor (Thin Film Transistor, TFT) display (TFT IXD), has been widely used in personal computers, notebook computers and other electronic products. 而TFT业者虽在大尺寸面板上较占优势,但在小尺寸的产品如PDA、电子书等产品上仍存在耗电量高、厚度大等许多无法克服的问题。 The TFT industry is far more dominant in the large-size panels, but there are still many insurmountable problems of high power consumption, size, thickness of the small size of products such as PDA, e-books and other products.

[0004] 液晶显示号称是低压驱动,但实际上也并不能一概而论,在多路驱动条件下,由于每一像素所占空间的变小,其整体面板的实际驱动电压(即Vee)有时会高达十几伏特至二十几伏特。 [0004] The voltage driving the liquid crystal display is known, and in fact can not be generalized, in multiplex driving conditions, since each pixel becomes a small footprint, the overall practical driving voltage of the panel (i.e., Vee) may be as high as more than a dozen to two dozen volts volts. 而像PDLC,多稳态(MIXD)液晶等的驱动电压可能因为液晶的流动(flow)效应而需高达几十伏特至百伏特左右的电压。 And like PDLC, the driving voltage multistable (mixd) liquid crystal because the liquid crystal or the like may flow (Flow) required to effect a voltage of about several tens of volts to one hundred volts up.

[0005] 又如双稳态向列型液晶显示器(Bistable Twist Nematic CrystalDisplay, BTN IXD)为一种可切换液晶分子在双稳态的液晶显示器,故其功率消耗低(low power consumption)。 [0005] Another example can be switched as a bistable liquid crystal molecules in the liquid crystal display bistable nematic liquid crystal display (Bistable Twist Nematic CrystalDisplay, BTN IXD), so low power consumption (low power consumption). 双稳态向列型液晶分子为保持该应有的形态,在装置上需在上下的配向膜上配置有一ί苗向力层(asymmetric anchoring energy substrates)。 To maintain the proper bistable shape, disposed on the device need to force a vaccine ί layer (asymmetric anchoring energy substrates) nematic liquid crystal molecules in the vertical alignment film. 更有同时须使用二禾中电压的组合样态来产生水平(horizontal)与垂直(vertical)电场来使液晶分子的二扭转态转换与一种电压样态来维持其稳定态。 While more voltage shall be used in combination of two Wo like state to produce a horizontal (Horizontal) and vertical (Vertical) to make the two electric converter with a voltage-mode twisted-like liquid crystal molecules to maintain its stable state.

[0006] 但该锚向力层是一细腻的表面图案排列(micro-patternedsurface),对于要求大量生产的显示器工业来说,设置该锚向力层在设备与维持其合格率上将会花费不少成本。 [0006] However, the anchor is a surface arranged in a pattern of fine (micro-patternedsurface) force layer, the requirements for the industrial mass production of displays, is provided to force the anchor layer on the device to maintain its passing rate will not take less cost. 并且因为液晶分子的二扭转态转换须破坏此锚向力层与液晶分子间的锚向力,因此需要一高电压电场来破坏该锚向力。 And because the two twisted state transition of the liquid crystal molecules to be damaged mooring force to force the anchor layer between the liquid crystal molecules, a high voltage electric field is required to destroy the anchoring force.

发明内容 SUMMARY

[0007] 为解决上述缺陷,本发明的主要目的在于提供一种驱动方式,其中可转换双频液晶(dual frequency liquid crystal)分子处于一禾中倾斜顺向状态(tilted—homeotropic state, TH state)禾口一种扭转状态(twisted state, T state)。 [0007] In order to solve the above drawbacks, the main object of the present invention is to provide a driving mode, wherein the dual frequency conversion crystal (dual frequency liquid crystal) molecule is in a forward inclined state Wo (tilted-homeotropic state, TH state) Wo port one kind of twisted state (twisted state, T state).

[0008] 本发明的次要目的在于所提供的驱动方式可使该双稳态液晶显示装置维持液晶分子于稳定态时不需要再有一维持稳定样态的电压,对显示装置而言将会更加省电。 [0008] Secondary object of the present invention is provided by way can drive the bistable liquid crystal molecules of the liquid crystal display device does not need to maintain a steady state Note that a voltage to maintain a stable state like, for the display device will be more power.

[0009] 本发明的再一目的在于本发明只需一般的磨擦技术(rubbingtechnique)来形成配向膜,而不需进一步在配向膜上配置一锚向力层,所以本发明适合于大量生产,同时也不需一高电压电场来破坏该锚向力层与液晶分子间的锚向力,对显示装置而言电能的利用将会更有效率。 [0009] A further object of the present invention, the present invention is generally simply rubbing technique (rubbingtechnique) to form an alignment film, without further configured to anchor a force to the film layer is equipped, so the present invention is suitable for mass production, while nor do they need a high-voltage electric field to break the anchor force to the anchoring force between the molecules of the liquid crystal layer, of display devices would be more efficient use of power.

[0010] 本发明的再一目的在于所提供的驱动方法为一种频率组合转换,也因为本发明装置不需要锚向力层,所以只须要一小电压(如电压5V)就可达到液晶分子呈现两种稳定状态的转换,藉此显示出画面的暗态以及亮态。 [0010] A further object of the present invention is to provide a driving method as a combination of a frequency converter, because the present invention does not require the device to force the anchor layer, only to a small voltage (such as voltage 5V) can reach the liquid crystal molecules conversion exhibits two stable states, whereby the display screen is dark state and bright state.

[0011] 根据本发明装置包括一上基板及一下基板,该上基板与该下基板相互对应设置; 一上偏光片及一下偏光片,该上偏光片及该下偏光片分别设于该上基板及下基板相对应面的另一面;两透明的电极层,两电极层分别设于该上基板与该下基板的相对应面;两配向层,两配向层分别设于两电极层的相对应面;一液晶层,该液晶层设于两配向层之间,且该液晶层布设有多个双频液晶分子(dualfrequency liquid crystal) 0其中,两配向层的预倾角介于45〜89度,并且该液晶层的厚度与一液晶分子的扭曲间距的比是0. 8至1. 05。 [0011] The present invention includes an upper substrate and a lower substrate, the upper substrate and the lower substrate corresponding to each set; respectively disposed on the upper substrate, an upper polarizer and a lower polarizer, the upper polarizer and the lower polarizer and the other surface of the lower substrate corresponding to a surface; two transparent electrode layer, two electrode layers are provided on the corresponding surface of the upper substrate and the lower substrate; two alignment layer, two with respectively disposed on two electrode layers to the layer corresponding to surface; a liquid crystal layer, the liquid crystal layer is disposed between the two distribution layers and the liquid crystal layer is laid with a plurality of liquid crystal molecules dual frequency (dualfrequency liquid crystal) 0 wherein, with two degrees in the pretilt angle between 45~89 layer, and a thickness of twist of the liquid crystal molecules in the liquid crystal layer than the pitch is 0.8 to 1.05.

[0012] 或者,该上、下基板之间的液晶层布设有多个双频液晶分子及二色性染料(dichromatic dye),这样根据本发明的液晶显示装置将不需设有前述的偏光片。 [0012] Alternatively, the upper liquid crystal layer laid between the lower substrate of liquid crystal molecules and a plurality of dual frequency dichroic dye (dichromatic dye), so that the liquid crystal display device of the present invention need not be provided with the polarizing plate .

[0013] 再配合本发明的驱动方法,由一信号源发出一第一驱动信号,且该第一驱动信号的频率是一第一频率,而该第一频率驱动该液晶层内的液晶分子;当该信号源停止发出该第一驱动信号后,使该液晶层内的液晶分子形成一稳定的倾斜顺向状态,及,该信号源发出一第二驱动信号,且该第二驱动信号是该第一频率结合其后紧接的一第二频率,该第一频率与该第二频率为不同的频率,以使该液晶层的液晶分子受该第二驱动信号的驱动;当该信号源停止发出该第二驱动信号后,使该液晶层内的液晶分子形成一稳定的扭转状态。 [0013] coupled with the driving method of the present invention, a first driving signal emitted by a signal source, and the frequency of the first driving signal is a first frequency, the first frequency while driving the liquid crystal molecules in the liquid crystal layer; when the signal source stops emitting the first driving signal, the liquid crystal molecules within the liquid crystal layer is inclined forward in a stable state, and the signal source emits a second drive signal, and the second driving signal is the binding a first frequency immediately following second frequency, the first frequency and the second frequency are different frequencies, so that the liquid crystal molecules of the liquid crystal layer is driven by the second driving signal; stopped when the signal source after issuing the second driving signal, the liquid crystal molecules within the liquid crystal layer is twisted to form a stable state.

[0014] 这样通过两种不同频率组合的驱动信号的转换,使液晶层内的液晶分子呈现倾斜顺向状态及扭转状态两种稳定状态的转换,藉此显示出像素的暗态以及亮态。 [0014] In this way two different frequencies into the drive signal of the combination, the liquid crystal molecules in the liquid crystal layer exhibits a tilted forward state and a twisted state of the two stable switching states, whereby the display pixel bright state and a dark state.

附图说明 BRIEF DESCRIPTION

[0015] 图1是根据本发明的液晶显示装置的示意图。 [0015] FIG. 1 is a schematic diagram of the liquid crystal display device according to the present invention.

[0016] 图2是根据本发明的另一液晶显示装置的示意图。 [0016] FIG. 2 is a schematic view of another liquid crystal display device according to the present invention.

[0017] 图3是两种驱动信号的转换,导致液晶分子呈现倾斜顺向状态与扭转状态转换的示意图。 [0017] FIG. 3 is a two drive switching signal, the liquid crystal molecules resulting in a state transition schematic diagram presented and twisted along the inclined state.

[0018] 图4是本发明的扭转状态转到倾斜顺向状态的透射比与电压的坐标示意图。 [0018] FIG. 4 is a twisted state to coordinate a schematic view of the present invention to the state of the voltage transmittance inclined forward.

[0019] 图5是本发明的倾斜顺向状态转到扭转状态的透射比与电压的坐标示意图。 [0019] FIG. 5 is a schematic view of the transmittance and the voltage coordinate twisted state inclined forward to a state of the present invention.

[0020] 图6是本发明以He-Ne激光为光源时各转换态的像素示意图。 [0020] FIG. 6 is a schematic view of a pixel in a He-Ne laser as a light source of the present invention, each transition state.

具体实施方式 Detailed ways

[0021] 有关本发明的详细内容及技术说明,现结合附图说明如下: [0021] and detailed technical description of the present invention is now described in conjunction with the accompanying drawings as follows:

[0022] 请参阅图1所示,是本发明的液晶显示装置的示意图。 [0022] Referring to FIG. 1 is a schematic view of a liquid crystal device according to the present invention. 本发明是一种双稳态液晶显示装置,是通过不同频率组合的驱动信号加以驱动的液晶显示装置,该装置包括:一上基板11及一下基板12,该上基板11与该下基板12相互对应设置;且该上基板11与下基板12 的相对应表面各分别设有一透明样态的氧化铟锡(indium tinoxide, IT0)形成的电极层2U22 ;及涂布(Coated) 二分别设置于该电极层21、22相对表面的配向层31、32材料(如NissanChemicals Co.生产的RN-1338),该配向层31、32材料可为摩擦配向材料及光配向材料的其中之一,其中该配向层31、32的预倾角介于45〜89度。 The present invention is a bistable liquid crystal display device, a driving signal is to be combined with different driving frequency of the liquid crystal display device, the apparatus comprising: an upper substrate 11 and lower substrate 12, the upper substrate 11 and the lower substrate 12 are the corresponding settings; and the upper substrate 11 and the lower surface of the substrate 12 corresponding to each of the electrode layers are provided with a transparent indium tin oxide like state (indium tinoxide, IT0) formed 2U22; and coating (coated) respectively disposed on the two 21 and 22 with opposing surfaces of layers 31, 32 to the electrode layer material (manufactured as NissanChemicals Co. RN-1338), the alignment layer material 31 and 32 may be equipped with one of the friction material and wherein the material of the light distribution, wherein the alignment layers 31, 32 between a pretilt angle of 45~89 degrees.

[0023] 一上偏光片41及一下偏光片42,该上偏光片41及该下偏光片42分别设于该上基板11及下基板12相对应面的另一面。 [0023] 41 an upper polarizer and a lower polarizer 42, and the other surface 41 of the lower polarizer 42 are disposed on the upper substrate 11 and lower substrate 12 corresponding to the surfaces of the upper polarizer. 其中该上、下偏光片41、42的吸收轴夹角介于80〜 100度之间。 Wherein the upper, the angle between the absorption axis of the polarizer is between 41 and 42 80~ 100 degrees. 而该上偏光片41的吸收轴与上基板11的配向层31的配向方向夹角介于0〜 180度之间。 And the upper polarizer 41 and the absorption axis of the upper substrate 11 with the alignment layer 31 in the direction of the angle between 0~ 180 degrees.

[0024] 一液晶层50,该液晶层50设于两配向层31、32之间,且该液晶层50布设有多个双频液晶分子51。 [0024] a liquid crystal layer 50, the liquid crystal layer 50 disposed between the layers 31 and 32 with two, and the liquid crystal layer 50 is laid with a plurality of dual frequency liquid crystal molecules 51. 该液晶层50可为如Merck Co.所生产的MLC-2048,其中该MLC-2048是一种具有当频率为低频率(IKHz)时,诱电率异方向性(dielectric anisotropy) Δ ε = 3. 22,及当频率为高频率(ΙΟΟΚΗζ)时,诱电率异方向性Δ ε =-3.4特性的材料。 When the liquid crystal layer 50 may be as produced Merck Co. MLC-2048, MLC-2048 wherein the having a frequency when the frequency is low (IKHz), Dielectric rate with anisotropic (dielectric anisotropy) Δ ε = 3 22, and when the frequency of high frequency (ΙΟΟΚΗζ), rate Dielectric material with anisotropic Δ ε = -3.4 characteristics.

[0025] 又根据本发明的该液晶层50的厚度(d)与液晶层50内的一液晶分子51的扭曲间距(pitch, ρ)的比(d/p)可为0. 8 至1. 05 之间(0. 8 ^ d/p ^ 1. 05)。 [0025] According to a further liquid crystal molecules 51 twist pitch (pitch, ρ) in the thickness (d) of the liquid crystal layer 50 of the present invention and the liquid crystal layer 50 ratio (d / p) may be 0.8 to 1. between 05 (0. 8 ^ d / p ^ 1. 05).

[0026] 请再参阅图2所示,是本发明的另一液晶显示装置的示意图。 [0026] Please refer to FIG. 2 is a schematic view of another liquid crystal device according to the present invention. 该装置包括:一上基板11及一下基板12,该上基板11与该下基板12相互对应设置;且该上基板11与下基板12的相对应表面各分别设有一透明样态的氧化铟锡形成的电极层21、22 ;及涂布二分别设置于该电极层21、22相对表面的配向层31、32材料(如NissanChemicals Co.生产的RN-1338),该配向层31、32材料可为摩擦配向材料及光配向材料的其中之一,其中该配向层31、32的预倾角介于45〜89度。 The apparatus comprising: an upper substrate 11 and lower substrate 12, the upper substrate 11 and the lower substrate 12 corresponding to each other is provided; and the upper substrate 11 and lower substrate corresponding to the surface 12 of each are provided as indium tin oxide, a transparent-like state electrode layer 21, 22; and 21, 22 respectively disposed on two coated surface of the opposing electrode layer 31 alignment layer material (manufactured as NissanChemicals Co. RN-1338), with the layer of material 31 to be with one of the friction material and wherein the material of the light distribution, wherein the pretilt angle of the alignment layer 31 is between 45~89 degrees.

[0027] 与图1不同之处在于该装置不需设置偏光设备,而是将如Merck Co.所生产的MLC-2048的液晶层50材料加入二色性染料后成为另一种液晶层50',即该液晶层50'布设有多个双频液晶分子51及二色性染料。 After [0027] that differs from the apparatus of FIG. 1 without polarizing device is provided, but the material 50 as produced by Merck Co. MLC-2048 liquid crystal layer of dichroic dye was added to another liquid crystal layer 50 becomes' , i.e., the liquid crystal layer 50 'is laid with a plurality of liquid crystal molecules 51 and the dual frequency dichroic dye. 当然,如前述该液晶层50'保有一种具有当频率为低频率(IKHz)时,诱电率异方向性Δ ε = 3. 22,及当频率为高频率(ΙΟΟΚΗζ)时,诱电率异方向性Δ ε = -3. 4特性的材料。 Of course, as the liquid crystal layer 50 'having retained when the frequency is low frequency (IKHz), with anisotropic Dielectric rate Δ ε = 3. 22, and when the frequency of high frequency (ΙΟΟΚΗζ), rate Yuden Δ material with anisotropic -3. 4 characteristic ε =.

[0028] 也就是利用光电效应中的gueSt_h0St效应,通过该二色性染料(为guest)具有在分子长轴方向和短轴方向可见光吸收异方性的特性,以约1/10比例溶解于一定排列的液晶(为host)时,因一般具有长棒形状的二色性染料会与液晶分子51平行排列,若改变为host的液晶分子51排列时,也会使作为guest的二色性染料分子排列作相关的变化,而可控制及调节染料的可见光吸收量,所以此显示装置将可不需要设置偏光设备。 [0028] i.e. the use of the photoelectric effect gueSt_h0St effect, having a visible light absorption characteristics of anisotropy in the molecular long axis direction and short axis direction of the dichroic dye (The Guest), was dissolved in the proportion of about 1/10 to certain when the liquid crystal alignment (as host), because generally having a long rod shape 51 arranged parallel dichroic dye and liquid crystal molecules will, if changed to the liquid crystal molecules 51 arranged in the host, but also make the dichroic dye molecules as a guest arranged as a relative change, while the amount of visible light absorbing dye may be controlled and adjusted, so that this display device may be necessary to provide a polarizing device.

[0029] 接下来请参阅图3所示,是两种驱动信号的转换,导致液晶分子呈现倾斜顺向状态与扭转状态转换的示意图。 [0029] Next, please refer to FIG. 3, it is a two drive switching signal, resulting in a schematic view of a state inclined forward and convert the twisted liquid crystal molecules exhibit. 该液晶显示装置设有一信号源,一开始液晶层50、50'内的液晶分子51排列混乱,因为液晶分子51将会呈一倾斜顺向状态与扭转状态共存的样态。 The liquid crystal display device is provided with a signal source, a start alignment liquid crystal layer 51 liquid crystal molecules 50, 50 'of confusion, because the liquid crystal molecules 51 will form a forward inclined state to coexist with twisted state like state. 但是,如果以该信号源发出一第一驱动信号,且该第一驱动信号的频率是一第一频率,而该第一频率&驱动该开始液晶层50、50'内的液晶分子51 ;当该信号源停止发出该第一驱动信号后,使该液晶层50、50'内的液晶分子51形成一稳定的倾斜顺向状态。 However, if the signal source to emit a first driving signal, and the frequency of the first driving signal is a first frequency and the first frequency & drive liquid crystal molecules in the liquid crystal layer starts 50 '51; when after the source stops emitting the first driving signal to the liquid crystal molecules of the liquid crystal layer 50, 50 'in a stable form 51 forward inclined state.

[0030] 而如果该信号源发出一第二驱动信号,且该第二驱动信号是该第一频率结合其后紧接的一第二频率f2(f\与f2),该第一频率f\与该第二频率f2为不同的频率,以使该液晶层50、50'的液晶分子51受该第二驱动信号的驱动;当该信号源停止发出该第二驱动信号后,使该液晶层50、50'内的液晶分子51形成一稳定的扭转状态(扭转状态)。 [0030] If the signal emitted by the source and a second driving signal, and the second driving signal is the frequency of the first frequency and a second binding f2 (f \ and f2) immediately following, the first frequency F \ and the second frequency f2 are different frequencies, so that the liquid crystal layer 50, 50 'of the liquid crystal molecules 51 driven by the second driving signal; when the source stops emitting the second driving signal to the liquid crystal layer the liquid crystal molecules 50, 50 'formed in a stable 51 twisted state (twisted state). 其中该第一频率的频率较该第二频率f2低(如= IKHz, f2 = ΙΟΟΚΗζ),且该第一频率可致使该液晶层50、50'内的液晶分子51的诱电率异方向性(Δ ε)为正值。 Wherein liquid crystal molecules of the first frequency is a frequency lower than the second frequency f2 (e.g. = IKHz, f2 = ΙΟΟΚΗζ), and the first frequency may cause the liquid crystal layer 50, 50 'of the rate with anisotropic Dielectric 51 (Δ ε) is positive. 而该第二频率f2的频率较该第一频率高,且该第二频率f2可致使该液晶层50、50'内的液晶分子51的诱电率异方向性(Δε)为负值。 And the frequency of the second frequency f2 higher than the first frequency and the second frequency f2 may cause the liquid crystal layer of the liquid crystal molecules with anisotropic Dielectric 50, 50 'of 51 (Delta] [epsilon) is negative.

[0031] 通过前述的装置配合两种不同频率(f\、f2)组合成(f\)、(f\与f2)的二驱动信号的转换,将使液晶层50、50'内的液晶分子51呈现倾斜顺向状态以及扭转状态两种稳定状态的转换,以显示出画面的暗态以及亮态。 [0031] with the two different frequencies by means (F \, f2) combined to (f \), (f \ and f2) of the second drive switching signal, the liquid crystal molecules will cause 'of the liquid crystal layer 50, 50 51 presents a forward inclined state, and transition state twisted two stable states, a screen to show a dark state and a bright state.

[0032] 请参阅图4,现以一He-Ne激光为光源(波长632. 8nm),当使用本发明的方法与装置来测量显示面板的像素,当以一第一频率&(如:1ΚΗζ)的第一驱动信号(5V)施加于液晶显示装置上,在此第一频率阶段液晶层50、50'内的液晶分子51将会经历一小段时间的转换过程形成光学相位差值的变化,导致透射比(transmittance)上的变化(如图4中的偏顺向状态(bias homeotropicstate,BH state)),而当第一驱动信号停止施加后,液晶层50、50'内的液晶分子51将形成一稳定的倾斜顺向状态。 [0032] Referring to FIG. 4, is to a He-Ne laser light source (wavelength 632. 8nm), when using the method and apparatus of the present invention to measure the pixels of the display panel, at a first frequency when the & (eg: 1ΚΗζ ) a first drive signal (5V) applied to the liquid crystal display device, optical phase difference change value is formed in this first stage frequency crystal molecules of the liquid crystal layer 50, 50 'in the conversion process 51 will experience a short time, resulting in transmittance (transmittance) changes (bias along a state shown in FIG. 4 (bias homeotropicstate, BH state)), and when the first drive signal is stopped is applied, the liquid crystal molecules 51 of the liquid crystal layer 50, 50 'in the forming a stable state inclined forward. 如图4所示,可发现偏顺向状态与倾斜顺向状态各自的透射比非常低,且都趋近于0,也就是像素呈现黑色样态(暗态)。 4, can be found in the forward biased state inclined forward state is lower than their transmittance, and converges to 0, that is, the pixel appears black like state (dark state).

[0033] 在显微镜下当白光穿透一像素处的液晶分子51为偏顺向状态与倾斜顺向状态的图像呈现如图6(a)、(b)所示,画面为暗态。 [0033] When white light penetrating the liquid crystal molecules under the microscope at a 51-pixel rendering for the partial cis FIG 6 (a), (b) state to the image shown in a state inclined forward, the screen is dark state. 至于为何倾斜顺向状态不如偏顺向状态黑,是因为倾斜顺向状态为一种近似螺旋倾斜的形态,而偏顺向状态为一种垂直排列,所以该短暂时间的偏顺向状态所呈现的画面较稳态的倾斜顺向状态暗。 As to why cis inferior oblique forward bias state to the black state, since the forward inclined state to form an approximate spiral inclined, the forward biased state as a vertical arrangement, so that the forward bias short time to the presented state a screen inclined forward than the steady state to the dark state.

[0034] 请再参阅图5,同样的以一He-Ne激光为光源(波长632. 8nm),当使用本发明的方法与装置来测量显示面板的像素时,当以一先具有第一频率再结合其后紧接的一第二频率f2(f\与f2)的第二驱动信号(5V)施加于液晶显示装置上,在此第一频率(如:1ΚΗζ) 阶段液晶层50、50'内的液晶分子51将会由倾斜顺向状态转为偏顺向状态,此时透射比几乎不变;紧接的第二驱动信号进入第二频率f2 (如:100KHz)阶段,该频率变动初始将会造成液晶层50、50'内有回流(backflow)的现象,此回流将导致该液晶层50、50'中间层液晶分子51的旋转,形成光学相位差值的变化,导致透射比上的突起现象(optical bounce) 0 如图5所示,透射比经过一极短时间的变动后该液晶层50、50'内的液晶分子51将会形成偏扭转样态(bias twisted state,BT状态),而当第二驱动信号停止施加后,该液晶层50、 50' [0034] Please refer to FIG. 5, the same with a He-Ne laser light source (wavelength 632. 8nm), when the pixels of the display panel is measured using a method and apparatus according to the present invention, when having a first frequency with a first combined with a second frequency f2 immediately following (F \ and f2) a second drive signal (5V) applied to the liquid crystal display device, in this first frequency (eg: 1ΚΗζ) phase liquid crystal layer 50, 50 ' the liquid crystal molecules 51 will be in a state inclined forward into a forward bias state, when the transmission ratio is almost constant; immediately second driving signal into a second frequency f2 (eg: 100KHz) stage, the initial frequency variation will cause 'phenomenon reflux (backflow) in, this will result in reflux of the liquid crystal layer 50, 50' of rotation of the liquid crystal molecules of the liquid crystal layer 50, 50 of the intermediate layer 51, optical phase difference change value is formed, resulting in the transmittance projection phenomenon (optical bounce) 0 5, the transmittance ratio of the liquid crystal layer formed of liquid crystal molecules 50, 50 'will be 51 in an extremely short time after a change of the biasing torsion like state (bias twisted state, BT state) , and when the second driving signal is stopped is applied, the liquid crystal layer 50, 50 ' 的液晶分子51将形成一稳定的扭转状态,如图5所示,可发现偏扭转样态与扭转状态各自透射比均大于0,也就是像素呈光亮状态(亮态)。 The liquid crystal molecules 51 form a stable twisted state, shown in Figure 5, the biasing may be found in twisted state and the twist state of each sample transmittance greater than 0, i.e. pixels are bright state (bright state).

[0035] 在显微镜下当白光穿透一像素处的液晶分子51为偏扭转样态与扭转状态的图像呈现如图6 (c)、(d)所示,画面为亮态。 [0035] When white light penetrating the liquid crystal molecules under the microscope at a pixel 51 is biased torsional twist like state image presentation state in FIG. 6 (c), (d), the screen is bright state. 又因为He-Ne激光为一种红、黄、绿三种颜色的激光, 其中红光最多,且偏扭转样态带桃红色,而扭转状态带绿色,所以该偏扭转样态有较高的透射比,而该短暂时间的偏扭转样态所呈现的画面较稳态的扭转状态为亮。 And because as a He-Ne laser of red, yellow, and green laser light, wherein the red light up, and the torsion biasing pinkish like state, and the greenish twisted state, so that the torsional bias like state higher transmittance, and the short period of time like state torsional biasing picture presented more twisted state as a bright homeostasis.

[0036] 以上所述仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。 [0036] The above description is only preferred embodiments of the present invention, it is not intended to limit the invention to those skilled in the art, the present invention may have various changes and variations. 凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包括在本发明的权利要求范围之内。 Any modification within the spirit and principle of the present invention, made, equivalent substitutions, improvements, claimed in the present invention should be included within the scope of the claims.

7 7

Claims (4)

  1. 一种双稳态液晶显示装置,其特征在于所述装置包括:一上基板(11)及一下基板(12),所述上基板(11)与所述下基板(12)相互对应设置;一上偏光片(41)及一下偏光片(42),所述上偏光片(41)及所述下偏光片(42)分别设于所述上基板(11)及下基板(12)相对应面的另一面;两透明的电极层(21,22),所述两电极层(21,22)分别设于所述上基板(11)与所述下基板(12)的相对应面;两配向层(31,32),所述两配向层(31,32)分别设于两电极层(21,22)的相对应面;一液晶层(50),所述液晶层(50)设于所述两配向层(31,32)之间,且所述液晶层(50)布设有多个双频液晶分子(51),其中所述配向层(31,32)的预倾角介于45~89度,并且,所述液晶层(50)的厚度与一液晶分子(51)的扭曲间距的比是0.8至1.05;其中,所述双稳态液晶显示装置由一信号源发出一第一驱动信号,且所述第一驱动信号的频率是一 A bistable liquid crystal display device, characterized in that said apparatus comprises: an upper substrate (11) and a lower substrate (12), said substrate (11) and the lower base plate (12) provided corresponding to each other; a a polarizer (41) and a lower polarizer (42), said upper polarizer (41) and said lower polarizer (42) are disposed on the upper substrate (11) and a lower substrate (12) corresponding to the plane the other side; two transparent electrode layer (21, 22), the electrode layers (21, 22) are provided on the upper substrate (11) and said lower substrate (12) corresponding to the surface; two alignment layer (31, 32), the two alignment layers (31, 32) are provided in the electrode layers (21, 22) corresponding to the surface; a liquid crystal layer (50), said liquid crystal layer (50) is provided to the between said two alignment layers (31, 32), and said liquid crystal layer (50) laid with a plurality of dual-frequency liquid crystal molecules (51), wherein said alignment layer with a pretilt angle (31, 32) is between 45 to 89 degrees, and the thickness of the twisted liquid crystal layer (50) with a liquid crystal molecules (51) of the pitch ratio is from 0.8 to 1.05; wherein the bistable liquid crystal display device of a first driving signal emitted by a signal source and the driving frequency of the first signal is a 一频率(f1),而所述第一频率(f1)驱动所述液晶层(50)内的液晶分子(51);当所述信号源停止发出所述第一驱动信号后,使所述液晶层(50)内的液晶分子(51)形成一稳定的倾斜顺向状态;所述信号源发出一第二驱动信号,且所述第二驱动信号是所述第一频率(f1)结合其后紧接的一第二频率(f2),所述第一频率(f1)与所述第二频率(f2)为不同的频率,以使所述液晶层(50)的液晶分子(51)受所述第二驱动信号的驱动;当所述信号源停止发出所述第二驱动信号后,使所述液晶层(50)内的液晶分子(51)形成一稳定的扭转状态。 A frequency (f1), and the first frequency (f1) to drive the liquid crystal molecules (51) in the liquid crystal layer (50); when said signal source stops emitting the first drive signal, the liquid crystal layer of liquid crystal molecules is inclined (51) in (50) forming a forward steady state; the signal source emits a second drive signal and the second driving signal is said first frequency (f1) followed by binding a second frequency (f2) immediately, the first frequency (f1) and the second frequency (f2) different frequencies, so that the liquid crystal layer (50) of the liquid crystal molecules (51) by the said second driving signal; liquid crystal molecules when the signal source stops emitting the second drive signal, said liquid crystal layer (50) inside (51) forming a stable twisted state.
  2. 2.根据权利要求1所述的双稳态液晶显示装置,其特征在于所述上偏光片(41)与下偏光片(42)的吸收轴夹角介于80〜100度之间。 The said bistable liquid crystal display device of claim 1, characterized in that the angle between the absorption axis of the upper polarizer (41) and a lower polarizer (42) is between 80 ~ 100 degrees.
  3. 3.根据权利要求1所述的双稳态液晶显示装置,其特征在于所述上偏光片(41)的吸收轴与配置于所述上基板(11)的配向层(31)的配向方向夹角介于0〜180度之间。 The said bistable liquid crystal display device of claim 1, wherein the absorption axis of the polarizer (41) and disposed on the upper substrate (11) with the interposed layer alignment direction (31) angle between 0~180 degrees.
  4. 4. 一种双稳态液晶显示装置,其特征在于所述装置包括:一上基板(11)及一下基板(12),所述上基板(11)与所述下基板(12)相互对应设置; 两透明的电极层(21,22),所述两电极层(21,22)分别设于所述上基板(11)与所述下基板(12)的相对应面;两配向层(31,32),所述两配向层(31,32)分别设于两电极层(21,22)的相对应面; 一液晶层(50'),所述液晶层(50' )设于所述两配向层(31,32)之间,且所述液晶层(50' )布设有多个双频液晶分子(51)及二色性染料, 其中,所述配向层(31,32)的预倾角介于45〜89度,并且,所述液晶层(50' )的厚度与一液晶分子(51)的扭曲间距的比是0.8至1.05 ; 其中,所述双稳态液晶显示装置由一信号源发出一第一驱动信号,且所述第一驱动信号的频率是一第一频率(fl),而所述第一频率(fl)驱动所述液晶层(50' )内的液晶分子 A bistable liquid crystal display device, characterized in that said apparatus comprises: an upper substrate (11) and a lower substrate (12), said substrate (11) and the lower base plate (12) provided corresponding to each other ; two transparent electrode layer (21, 22), the electrode layers (21, 22) are provided on the upper substrate (11) and said lower substrate (12) corresponding to the surface; two alignment layers (31 , 32), are disposed with the said two layers (31, 32) to the electrode layers (21, 22) corresponding to the surface; a liquid crystal layer (50 '), said liquid crystal layer (50') provided in the between two alignment layers (31, 32), and said liquid crystal layer (50 ') laid a plurality of liquid crystal molecules dual frequency (51) and a dichroic dye, wherein the alignment layer (31, 32) of the pre angle between 45~89 degrees, and the thickness of the twisted liquid crystal layer (50 ') with a liquid crystal molecules (51) of the pitch ratio is from 0.8 to 1.05; wherein said bistable liquid crystal display device consists of a signal a source emitting a first driving signal and the driving frequency of the first signal is a first frequency (fl), and the first frequency (fl) drives the liquid crystal molecules in the liquid crystal layer (50 ') (51);当所述信号源停止发出所述第一驱动信号后,使所述液晶层(50)内的液晶分子(51) 形成一稳定的倾斜顺向状态;所述信号源发出一第二驱动信号,且所述第二驱动信号是所述第一频率(Π)结合其后紧接的一第二频率(f2),所述第一频率(fl)与所述第二频率(f2)为不同的频率,以使所述液晶层(50' )的液晶分子(51)受所述第二驱动信号的驱动;当所述信号源停止发出所述第二驱动信号后,使所述液晶层(50')内的液晶分子(51) 形成一稳定的扭转状态。 (51); when said signal source stops emitting the first drive signal, the liquid crystal layer of liquid crystal molecules (51) in (50) forming a stable forward inclined state; a first of the signal emitted by the source second driving signal and the second driving signal is said first frequency ([pi) binding a second frequency (f2) immediately following said first frequency (fl) and the second frequency (f2 ) for different frequencies, so that the liquid crystal layer (50 ') of the liquid crystal molecules (51) driven by said second driving signal; when the signal source stops emitting the second drive signal, the liquid crystal molecules in the liquid crystal layer (50 ') (51) forming a stable twisted state.
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US4909603A (en) 1987-03-14 1990-03-20 Sharp Kabushiki Kaisha Liquid crystal display element

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