TW200811429A - A method and system for measuring the liquid crystal polar anchoring energy - Google Patents

Abstract

The invention discloses and develops a simple while accurate method to determine the anchoring energy by using a common-path optical heterodyne interferometer arrangement. By measuring the phase retardation of the LC cell versus the applied voltage, the polar anchoring energy of the homogeneously aligned cell can be precisely obtained.

Description

200811429 IX. Description of the Invention: [Technical Field] The present invention relates to a method and system for determining the characteristics of a p向lar anchoring energy of a nematic liquid crystal cell, and more particularly to applying a voltage to a liquid crystal cell. 'With the common optical path difference frequency interference technology, the phase change of the liquid crystal molecules of the horizontal alignment liquid crystal cell under the action of the electric sensation is analyzed, and the inclination of the liquid crystal molecules under the action of the electric φ pressure is simply and quickly obtained. Energy person. [Prior Art] (4) The age of Laihuao-side hair, research on the surface of the dragon and the wrong 迠1 is an important direction for the development of industrial science today, including the river ¥ eight vertical alignment and the weak anchor of the IPS horizontal electric field service. Constant force and so on - technology development, so the anchoring effect of liquid crystal and solid interface contact has received extensive attention. However, different pinning characteristics often cause significant differences in the electro-optic effect and display characteristics of the liquid-activating a-box, such as the starting voltage _ (Vth), light transmittance, contrast, etc., and affect whether it can be applied to a specific type of liquid crystal. a display in which the anchoring energy is mainly dependent on (1) the physicochemical forces of the alignment film, such as a hydrogen bond, a van der Waals force, and a Dipole-dipole force; (2) a mechanical force effect, That is, the groove type (Groove) or the alignment film surface type. At present, the study of liquid crystal surface tilt angle and anchor energy can be divided into destructive and non-destructive. Destructive methods include: (i) Atomic F〇rce Mier()sa), afm) observation and measurement of surface anchoring energy by direct fragmentation (eg reference: Jan. Appi. Phys., 32, ΡΡ· L1242~L1244, 1993); (2) Calculate the tilt angle of the liquid crystal with the optical double frequency signal. 200811429 The tilt angle of the molecule and the surface, the laser of the required laser will cause the damage of the alignment film (such as reference) : Phys· Rev·, A39, PP·3745~3747, 1989); (3) The orientation and friction of the alignment film molecules caused by the directional friction analysis by infrared spectroscopy, the surface anchoring energy of the liquid crystal molecules will increase as the friction intensity increases. (eg, References · M〇LCiyst.Liqe Cryst 28, pp. 755-757, 1988). Non-destructive methods include (a) Half leaky guided wave methods (eg references) · j. Appl· Phys, 85(2), ρρ·728~733, 1999), used to investigate the directoral distortion of parallel-aligned liquid crystal molecules under the action of a coplanar electric field, that is, the elastic free energy change in the liquid crystal cell before and after the applied electric field is applied. Distribution map and half leakage of liquid crystal director distortion The reflected data of the guided wave is fitted and compared to obtain the torsional elastic constant Km and the torsional anchoring energy; (2) using the excitation table (4) to remove the liquid crystal molecules at the silk angle and collapse the surface: AppL Optics, 27( 19), pp4098-4011, 1988); (3) High electric field technology (eg reference j· Αρρ1· Phys, 57, pp452〇~4526, 985) plus the electric field to cause phase delay of the liquid crystal cell The tilt error energy is obtained from the product of the phase delay magnitude and the product of voltage and capacitance (CV); (8) Simplified high electric field method (RV) (eg, reference j. Appl. Phys.K% 1999), using the extra high The electric field is measured on the liquid crystal cell, and the liquid is measured under the action of different high electric fields. The molecules are shaped by the molecule (4), and the closest anchoring energy is compared by experimental and theoretical numbers. In the research of measurement, high electric field technology is the most widely used 'but the technology often needs to measure the capacitance value and phase delay of the liquid crystal cell at the same time. In order to measure the electricity valley value', the pattern definition of the electrode must be completed before making the liquid crystal cell. , however, 200811429 needs to be defined in the electrode pattern Side process, but in addition to removing unnecessary electrode areas, the side solution often accidentally damages the protected electrode area, which causes uneven alignment of liquid crystal directors in nearby areas, resulting in misaligned energy. The measurement error is complicated, and the manufacturing process is complicated. In addition, the high electric field method experimentally limits the thickness of the liquid crystal cell to a range of 40 to 5 〇 flm, so for a commercial liquid crystal cell (thickness of ~50_) The measurement is not applicable; in addition, the uniformity of the thickness of the liquid crystal cell also affects the accuracy of the capacitance measurement. Due to various limitations and shortcomings of the high electric field method, the simplified high electric field method (RV) is proposed to be improved, and the simplified high electric field method (Rv) is applied to the liquid crystal cell by providing a non-discriminatory voltage to record different voltages. The optical phase delay varies, and the tilt angle is mismatched compared to the theoretical numerical simulation results. In summary, the measurement of phase retardation and voltage dependence of liquid crystal molecules is very important for the measurement of anchor energy. At present, there are (1) ellipsometers for phase measurement (eg, reference. Jan. J. AppL) Phys·, 44(2), PP. 932~939, 1993); (2) Rotary analyzer method (eg reference J. AppL Phys) 86(8), ρρ·4199~4211, 1999); 3) • Senarmont technology (eg reference: J. Appl. PhyS., 86 (8), ΡΡ 4199~4212, 1999); ellipsometer is mainly used to measure the intensity of reflected light after the light is incident on the liquid crystal cell, and utilize The detected intensity of the reflected light is converted into a refractive index change, thereby obtaining a phase delay-delay amount. However, due to the absorption and reflection of the dielectric material when the light passes through the liquid crystal cell, a serious error in the measurement is often caused, and Because the instrument is relatively expensive, it is less widely used. The rotary analyzer method uses a rotating analyzer to achieve the frequency shifting mechanism, and the reference light and the intensity of the test light are input to the lock-in amplifier to intercept two. The phase difference of the signal, due to the frequency shifting mechanism generated by the rotating analyzer Mechanized and susceptible to environmental disturbances and mechanical aging of the ring 7 200811429; Sennmont technology mainly uses the detection of light intensity and then push back the phase value, however, due to poor optical power stability, and experimental liquid crystal cell liquid crystal director The azimuth must be angled with the polarizer and the λ/4 wave plate at the same time. Therefore, the accuracy of the angle and the disturbance of the optical power often affect the experimental value. Therefore, how to overcome the environment, the age of poetry and the optical axis It is very important to measure the error and inconvenience in the measurement of the parameters of the crystal box. In view of the wide application range of the wide viewing angle technology of the display, if the optical system of the prior art is used to measure the tilting energy of the liquid crystal cell, it is often Due to external environmental disturbances, laser light stability, _ substrate unevenness or inhomogeneity and interference effects of multiple beams, the measurement of the free energy of the boundary layer of the liquid crystal layer will be - Lai Key. Based on the rich knowledge and experience, the inventor actively worked hard to research liquid crystal display technology, and after careful research and development, finally made A novel and solution _ quantity green is exhibited; the method of _ _ non-breaking common optical path heterodyne interference technology to measure the phase delay of the liquid crystal cell, _ improved Laihua high electric field (rv) technology for the action of the electric field The phase retardation caused by the birefringence of the liquid crystal cell is discussed. She discusses the delay of the addition of the cake without the crystal box, and the anchoring energy is set in the tilting angle. And the linearly polarized light of the difference frequency belongs to the common optical path (that is, the propagation path is the same), so the phase value measured by the system is completely provided by the liquid crystal cell test # itself, which can eliminate the influence of the loop and the coffee. Interference effects and other issues, so the system is a set of accurate, fast, frame, simple common light interference system, and has the progress of the system, in line with the simplified measurement of fine-grain order and industrial utilization, it is bound to The tilt angle of the liquid crystal cell is 8 200811429 and it will become the design freedom in the future measurement and display of the viewing angle of the LCD, and the development of the parameter measurement technology.

Seeing the technique of the customary gamma, the affliction of the 轴 569 569 569 063 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 569 As for the measurement of the declining energy, the measurement system based on optical power has its shortcomings, such as environmental disturbance, laser light power stability and interference caused by interference scale riding, which makes the development process difficult. And affect the nature and effectiveness of the product. In addition, the Japanese patent No. 89 patent pending case - measuring the physical properties of liquid crystal materials transposed two systems using - light _ gamma, through the silk after her creep money to take the size of its optical power and then push back the liquid crystal box parameters ' However, the structure of the silk tree and silk measurement structure is more complicated. In addition, Japan's announcement No. 3413G5 project - secrets (such as device f〇 revaluating interface, which uses polarizing plates orthogonal to the liquid crystal cell, and records the light in the price of the official crystal money Wei _ her crystal fine energy However, the performance of the laser light source and the environmental disturbance will also affect the accuracy of the disturbance. As described above, the conventional technical feature method is different from the present invention. [Summary of the Invention] The main features of the present invention are directed to The light intensity detection technology proposed by the conventional measurement technology is improved, and the measurement of the energy of the collinearity difference (four) line of the liquid crystal cell is lazy, and the technique is not affected by light, and the stability of the f-ray is determined. Absorption and other factors are shocked; therefore, it can reduce the measurement error value caused by external disturbances, improve the accuracy of industrial measurement, and record; I Wei Lai Lai and operation simply meet the simplified measurement operation 9 200811429 Procedures and production (four) gallery Benton's miscellaneous zee_ bistable frequency laser to design - common optical path heterodyne interference measurement system, this line is measured by liquid crystal birefringence s and P light haze hawdation), therefore Instant and accurate analysis of levels (4) The phase change of the optical phase under the influence of the electric field' is supplemented by a numerical theory simulation method to analyze the correlation curve between voltage and phase delay, and then the experimental results are compared with the theoretical analysis values to obtain the liquid crystal molecules under the action of externally applied electricity. The dip angle is the wrong energy. [Embodiment] The technical principle of the present invention and the implementation of the basic characteristics of the method for determining the energy characteristics of the nematic liquid crystal cell are as follows: a liquid crystal cell with parallel alignment as a test object, and in the liquid crystal cell The voltage is applied, and the phase change of the liquid crystal molecules of the liquid crystal cell under the action of voltage is analyzed by the common optical path difference frequency interference technique, and the phase change under the specific liquid crystal cell parameters is analyzed by theoretical numerical simulation, and the experimental results are compared with the experimental results. The theoretical analysis is fitted and compared to obtain the tilt anchoring energy of the liquid crystal molecules under the voltage of the liquid crystal cell. In order to enable the examiner and those of ordinary skill in the art to have a more specific understanding of the principles, features and operation modes of the present invention, the theory of the interferometric system, the theory of the tilt anchoring energy, and the embodiment and the schema are separately performed. The description and the possible embodiments are described below with reference to the drawings. (1) Inclination anchoring theory The liquid crystal molecules have elasticity. Generally speaking, the elastic coefficient of liquid crystal can be defined as the splay and κ22 twist of the liquid crystal under the action of different external moments from 200811429. And Κ: 33 bend west (bend) the ability to return to the original equilibrium state after three different deformations. Therefore, according to the Oseen-Frank liquid crystal continuous elastic deformation theory, the elastic potential energy density per unit volume of liquid crystal molecules due to deformation can be expressed. Cheng: where ^ is the average director of the liquid crystal molecules. Here we assume that the liquid crystal molecules near the surface of the alignment film belong only to the tilt mode without the twist pattern, so the formula (〖) can be rewritten as ^^=^n(V^)2+^33^xVxn)2 (2) When the applied electric field and the force of the liquid crystal molecules and the boundary exist, we can express the elastic free energy as: U ^ EL+U EM)dz + U Sl+U S2 (3) where UEM is the applied electric field in the liquid crystal cell, The potential energy felt by the liquid crystal molecules, Usi and US2 are the surface free energy densities between the liquid crystal and the alignment film interfaces, respectively. The surface free energy usl, uS2 here can be expressed as a Rapini_Papoular approximation:

Us, a =^wesin2 Αθ + ^ψφύη2 Αφ (4) where we and respectively represent the inclination anchoring energy and the torsion angle anchoring energy. It indicates the deviation of the liquid crystal molecules from the tilt angle to the azimuthal direction (200811429), respectively. However, in essence, in the Rapini_Papoular approximation, the actual tilt angle and torsion angle in the liquid crystal cell are matched. Here we are the liquid crystal cell (no twist) arranged for the balance, so the liquid crystal cell inside is not twisted. We can express the formula (4) as: us =-Wesm2A0 (3)

In the equilibrium state, the total free energy reaches the minimum value, ie δυ=〇, and the free energy is obtained by the variational method. The two-surface moment balance equation of the simultaneous _lapLagrange wire type can be obtained: r by j cos2 θ-\- K33 sin2 θ) άθ dz -sin 2^ (Κη -Κ33)θ2-ι-ε0ΑεΕΐ\ϊ 2=0 1 sin 2(6^--^) 2cos2 sin2 θ) άθ dz

Wosin2(0r0D) z=d 2Ψη^θ)^(κ, 3ύη2θ) (6) The Θ in the formula (6) is the titer angle of the liquid crystal molecules, and ~ is the pretilt angle of the liquid crystal molecules. Since the liquid crystal molecules have dielectric anisotropy, the electric field applied to the wall is expressed by electric displacement, and the relationship between the applied voltage and the electric displacement under the applied electric field is ·· ν^Ε^^ί~^-θ (7) It is considered that the electric displacement in the ζ direction, & ε// is a dielectric constant perpendicular to and parallel to the liquid crystal axis, and Α ε:= ε / Γ ε χ. Since the distribution of the liquid crystal directors will be different under different electric displacements, please refer to the numerical analysis diagram of the figure, and the applied electric field changes the director angle of the liquid crystal, thus causing the directors of the liquid crystal tissue to be oriented. Variety. In the boundary liquid crystal pointing theory is not ambiguous. In the low electric field, it is easy to change the liquid crystal of the middle layer, but the change of the liquid crystal layer pointing near the boundary is small. However, in the case of a high electric field, the liquid crystal director has an angle of inclination with the electric field, and the inclination angle of the liquid crystal layer of the boundary continues to increase as the electric field increases, although the electric field applied to the liquid crystal cell reaches. When a certain saturation voltage (non-operating voltage) is included, the boundary with the liquid crystal layer refers to the direction of the f field; therefore, we change the vine voltage; M, the way to observe the liquid crystal director change With the phase delay, you can know the size of the financial resources. - The limb θ(8) is made, and the optical phase delay can be easily calculated by the formula (8): Γ: 2π ~λ •|% “outside)) “±]^ (8) nnn, sin2 θ + nl cos2 θ (9) (2) Interferometric System Theory The optical phase retardation amount of the liquid crystal required by the present invention can be measured by the device of the present invention (refer to the second figure), and the specific implementation manner of the differential frequency interference technique of the present invention adopts a A bistable frequency laser heterodyne interference measurement system comprising: a dual-stabilized laser source (10) (Zeeman Laser wavelength 632.8 nm) system for generating 13 200811429 two different frequencies of s and p Line polarized light; a beam splitter (11), splitting the light into two paths 'respectively reference light and test light respectively; second detecting plate (12) (13), the penetration axis and horizontal direction of the analyzer Clip 45. The angle causes the s and p-line polarized light to generate an interference beat (M) Beat; the second photodetector (14) (15) receives the test light and the reference light respectively; and a phase meter (16) ) for capturing the phase difference between the test light and the reference light; the liquid crystal cell (20) of the object to be tested is a horizontally arranged nematic liquid crystal cell. The present invention utilizes Zeeman bistable The laser establishes a Heter〇dyne Interferometer measurement system to accurately measure the phase retardation of the liquid crystal cell, and the Zeeman laser emits two channels each having a frequency of ωι, 〇 > And mutually orthogonal linearly polarized light, when the light passes through the beam splitter (η), two different paths of light are generated as reference light and test light path, respectively. First, two mutually orthogonal linearly polarized lights in the reference light After the analyzer (13) is detected, interference occurs, and then enters the photodetector (14) to be received; the other test light passes through the liquid crystal cell to be tested (2〇), because the liquid crystal has birefringence characteristics, resulting in passing through the liquid crystal cell. (20) The two orthogonal linearly polarized light produces phase _ delay Γ 'Subsequent interference is generated by the analyzer (12), which is finally detected by the photodetector (15), and then the light is used by the phase meter (16). The signals received by the detectors (14) and (15) are processed and compared to obtain the phase difference between the two signals. First, we use equations to represent two of the reference beams with different frequencies of s - polarization and p The electric field of polarization is expressed as:

Erl(t) = Arl exp(/^〇 nm (11)

Er2(t) = Ar2 exp(iw2t) 200811429

Among them, Arl, Ar2, and ωι, kiss are respectively the vibration _ and frequency of two orthogonally polarized lights in the reference light. When the beam passes through the analyzer (13), the two polar lights generate the beat frequency (bJ interference. fL5 tiger, The light intensity can be expressed as follows: /r=/〇+Ar cosKa, ^〇}2)t] -/〇+Ar cos(^i) (12) where IG is DC DC component and % is two orthogonal line offset The frequency difference of the aurora. After the test light signal is passed through the liquid crystal cell, due to the birefringence of the liquid crystal molecules, the phase shift delay amount is obtained, and the electric field of the two-line polarized light is expressed as follows: (13)

Esi(t) = As2 txp(iw2t + V) (14) where Asl, A. And Γ!, ΓΖ respectively test the amplitude of the second-line polarized light in the light and the phase induced by the liquid crystal molecules. After the analyzer (12), a beat frequency interference signal is also generated, and the light intensity can be expressed as ·· ' 八=/0+ac〇s[(6;广%) ί+(η—Γ2)] = h+As cos(^i + J) (15) where I〇 is DC straight flow, Γ To test the phase delay caused by light passing through anisotropic liquid crystal molecules, it can be expressed as Γ2=(2; γ//1) Δ heart j. The phase difference 即 (ie, the message to be tested) is recorded in the phase term of the beat signal, so that the interference signal can be compared with a reference signal of the same frequency, and the phase delay amount can be obtained by using the electronic circuit processing technique. Γ Analyzed. 15 200811429 The phase difference measured by the common optical path interference system of the present invention (as shown in the second figure) is simply contributed by the phase delay caused by the refractive index distribution of the liquid crystal molecules, so the stray light and the light source introduced by the outside party are not The intensity is unstable; the interference system can accurately, quickly and sensitively obtain the slight phase change caused by the rearrangement of the liquid crystal molecules by the electric field under different voltages. Please refer to the third figure. . With the difference frequency interference technology of this system, we can investigate the change of optical phase characteristics of liquid crystal molecules under the influence of electric field, and observe the optical phase delay caused by changing the voltage mode and supplemented by theoretical numerical simulation. Using the experimentally obtained phase delay and the reciprocal (1/v) relationship between the maximum voltage and the theoretical simulation results, the anchoring energy can be inferred. Please refer to the fourth and fifth figures. (3) Specific Embodiments In order to more specifically understand the hybrid mode of the present invention, please refer to the first to fifth figures to illustrate that the device of the present invention takes care of the liquid crystal cell. First of all, we first make a horizontal touch-contact liquid crystal cell with substrate cleaning, liquid coating and brushing, _ sub-spraying, transfer coating, hot pressing and other techniques. The thickness of the gap used in this experiment is 8.75, the liquid crystal material of Lishun is poured into the liquid crystal cell, ^^ n±==L52l? ^ Κιι=1Ζ8χΐ^ Κ33 20·6χ1〇N, %=19 3 and £丄=5 2, The liquid crystal cell is the test piece we want to measure at the company. The completed liquid crystal cell (10) is placed in the experimental device of Figure 2. 16 ϋ Λ Λ: 乂 j 三 - 乂 ·:, .: c 22:-,. 200811429

The phase shift of the liquid crystal cell under the action of an external helmet is measured by the common optical path heterodyne interference measuring system of the present invention. A Zeeman laser light source emits a line-biased laser beam having two different frequencies and perpendicular to each other, the laser beam passing through a beam splitter (11) to generate a reference light and passing through the liquid crystal cell (20) The test light is applied, and the interference plate (12) (13) is used to respectively generate the interference phenomenon of the beat signal by the two mutually perpendicularly polarized light of the reference light and the test light signal, respectively, and respectively by the light detector (14) and (15) Received and then input the signal into the phase meter (16) for phase measurement, and then the dependence of the applied voltage on the phase change can be obtained. Since the two mutually orthogonal differential-frequency linearly polarized light in the signal light is a common optical path transmission, the phase obtained by the phase meter is completely derived from the refraction characteristics of the liquid crystal cell. The relationship between the phase delay and the applied voltage is measured by the apparatus of the present invention. The range of the applied voltage in this experimental example is from 〇v to 7〇v. Wherein, the heterodyne interference 1 measuring device of the present invention is also applicable to the reflection of a reflective horizontally arranged liquid crystal cell. When the test light passes through the mirror in the liquid crystal cell, the light is reflected, and then the light is detected. For the purpose of receiving, it can also achieve the purpose of phase detection. After measuring the change of the voltage generated by the addition of the voltage, the magnitude of the anchor energy is determined by the _bit delay of the experiment and the reciprocal of the maximum voltage (1). /v earning a graph to compare with the theoretical number of results, we can infer the value of the misalignment coefficient of the dip. Therefore, using ^|^(Mouse = thickness and face angle of the film, the Kede people will be checked and analyzed; Therefore, starting with the second, only the relationship diagram of the electric phase phase, the maximum phase delay can be obtained by extrapolation techniques to determine the thickness of the liquid crystal cell (eg, References, Dirty EjWpTe, (9), 17 -; ι 200811429 PP. 77~81, 2005); As for the pretilt angle measurement, the crystal rotation method is used, and the dependence of the phase on the incident angle of the light is measured by the method of the present invention, and the measurement result of the experiment is found. The angle of incidence of the maximum phase delay can be accurately measured for the pretilt value of the cell (eg, Reference: Society for Information Display, IDW/AD, 05, 1, pp. 209-210, 2005) Related parameters of the material (n//, n±, K11, k33, %, and ε±) and The amount of liquid crystal cell thickness and pretilt angle are substituted into the Mouse LCD software, and different tilt anchoring energies are given to simulate the correlation between different voltages and dip distributions. As shown in Figure 1, 'the voltage is different from the dip distribution. The phase change caused. Since the reciprocal (R4/V) of the phase applied voltage of the liquid crystal cell will be linear when the high voltage is applied, the high voltage range of the comparative example of the experimental example of the present invention is taken at 40-65v. Within the interval (this segment is a linear region), the phase dependence of the simulated phase change and the reciprocal of the voltage with a given dip anchoring energy is compared with the experimental phase _1/v curve, as shown in the figure. The comparison between the R4/V experimental curve and the simulation results of the four is shown in the figure. The simulated tilt angle energy range is 5.8*l (R-1/V curve of T3J/m2~6.3*HT3J/m2 and this The results of the experimental example are the closest. Therefore, we will enlarge the graph in Fig. 4 and intercept the partial results measured under the high voltage for the second comparison. It is hoped that the simulated phase delay and voltage curve (R4) /V) and experimental data west line ratio The most reasonable angle of the pinning energy is obtained. As shown in the R4/v flut curve of Figure 5, the anchoring energy of the liquid crystal cell test piece can be successfully obtained to be 5.95*1〇-3J/m2. Energy is a model of strong kinetic energy. 18 200811429 贰·Technical characteristics of the invention, 1 • Phase-domain technique: This (four) needle crystal box _ liquid crystal molecular dielectric anisotropy with the applied voltage changes The amount of delay variation is directly intercepted by the phase difference of the molecular orientation in the liquid crystal cell by means of the common optical path heterodyne interference, instead of the light intensity and then converted back to the phase. Therefore, the technology provided by the invention can accurately obtain the phase delay amount, and then use the theoretical analysis and the experimental result to push back the liquid crystal cell (four) constant energy, which is in the progress of the industrial measurement, the precision and the high sensitivity application. Great development potential. 2·Optical Miscellaneous··································································································· The measurement of the phase delay 造成 caused by the applied voltage; therefore, it conforms to the invention of simplifying the measurement operation procedure and industrial applicability. 3 · Optical theory · ♦ In the traditional high-field technology, the capacitor term is retained. Therefore, it is necessary to measure the capacitance of the liquid crystal cell in order to obtain the value of the liquid crystal cell capacitor. The wrong energy theory of the present invention is improved by using a simplified high electric field (RV) technology, and the applied voltage is in a voltage range corresponding to more than six times the threshold voltage and causing 80% of the maximum phase difference. ' 纟 Delay is inversely related to the voltage reciprocal. In this linear interval, the experiment is performed and the value of the Ficing H(10) Xiao Caineng is considered; so that there is no need to advance the amount in the alignment process. Measure the size of the capacitor. The method is simple and easy to operate, and the method is also applicable to the measurement of a commercial thin liquid crystal cell. Meanwhile, the common optical path design of the present invention can accurately measure the phase of the liquid crystal cell 19 200811429, thereby providing an industrial application. The technical effect of the present invention is as follows: 1. The optical system of the present invention belongs to the common optical path interference, and since the traveling paths of the two mutually orthogonal linear polarized lights are the same, the phase difference between the two polarized lights is completely composed of liquid crystal molecules. Caused by the refraction anisotropy. In addition, because the signal captured by the system is phase rather than light intensity, it can avoid the influence of external environment disturbance, laser power instability and multi-beam interference, so it can achieve high precision and high sensitivity measurement. 2. The optical system used in the present invention is simple and highly precise, and its laser stability and phase resolution (up to nm) are superior to conventional measurement systems; and no complicated optical correction, optical power detection, and no The tilt anchor energy measurement of the liquid crystal cell is performed under the sample cell. 3 · The Benton device can measure the thickness of the box at the same time without replacing or adding any optical components. In contrast, the conventional technology often has different devices for different Lc parameters, so the technology is different. The lining is superior to the conventional technology, so it can reach the benefits of multi-functionality. The invention of the present invention is a low-priced, simple structure of the common light material 轩 involved in the phase of the city to take the 'nothing, such as the knowledge of the optical power of the complex experimental procedures and difficult to disturb the interference. In addition, we can simultaneously perform the phase change caused by the liquid B hurricane and the electric disturbance by the skirt of the present invention, and the phase of the incident angle and the phase retardation of the material, and the material needs to be as known. Technology must be private _ parameter quantity _ Qian Shuo's optical system so 20 200811429 The device of the invention has a shirt ship _ benefits. The thickness of the obtained _ 纽 纽 带 模拟 模拟 模拟 模拟 模拟 模拟 模拟 模拟 亚 亚 亚 亚 亚 亚 亚 亚 亚 亚 亚 亚 亚 亚 亚 亚 给 给 给 给 给 给 给 给 给 给 给 给 给 给 给 给 给 给 给 给 给 给 给(R 1/V) and Beacon 1 compare the results to obtain the most reasonable tilt anchoring energy. The above is only one of the possible embodiments of the present invention, and is not intended to limit the scope of the patents of the present invention. All should be included in the scope of the patent of the present invention. The invention is specific to the structural features of the application, and is not found in the same technology' and has practicality, advancement and industrial applicability, and has met the requirements of the invention patent, and has been submitted according to law (4) The patent is based on the lawful interest of the applicant. [Simple description of the diagram] The following is a brief description: (1) Schematic part: The first figure is a schematic diagram of the inclination distribution of liquid crystal molecules of the liquid crystal cell of the present invention at different voltages; Schematic diagram of the structure of the interference system; the third figure is a schematic diagram of the relationship between the phase change and the voltage of the measuring liquid crystal cell of the present invention; the fourth figure is a comparison chart of the experimental results and the theoretical simulation of the R-1/V of the present invention; and the fifth figure is the R- of the present invention. 1/V experimental and theoretical ratio chart. [Description of main component symbols] (10) Dual-frequency laser light source (11) Beam splitter 21 200811429 (12) (13) analyzer board (14) (15) photodetector* (16) phase meter (20) liquid crystal Box 22

Claims (1)

200811429 X. Patent application scope: 1. The method for determining the anchoring energy characteristics of the nematic liquid crystal cell, including · using the liquid crystal cell as the object to be tested; applying voltage to the liquid crystal cell; The interference technique analyzes the phase change of the liquid crystal molecules of the liquid crystal cell under the action of voltage, and measures the relationship between the phase change of the liquid crystal and the reciprocal of the voltage (1/V) under the action of the electric field; and analyzes the phase change by mathematical simulation And comparing the measured result with the theoretical value, thereby obtaining the misalignment energy of the tilt angle of the liquid crystal molecule under the voltage of the liquid crystal cell. 2. The method described in the patent application item i, wherein the result of the high voltage is intercepted for the second alignment, and the misaligned energy is accurately obtained. 3. The method of claim 1, wherein the liquid crystal cell has been subjected to frictional alignment processing, so that the Wei Jing New Energy can be defined as the tin level of the lower county. The method of claim 1, wherein the measured phase change is mathematically calculated to obtain a thickness and a face angle of the crystal box, and the theoretical tilt angle of the liquid crystal cell is calculated by the thickness and the pre-tilt angle. The method of claim 4, wherein the method of calculating the theoretically determined energy by the thickness and the pretilt angle of the liquid crystal cell is to substitute the thickness and the pretilt angle. The Mouse LCD software is used to obtain the theoretical tilt anchoring energy. 6. The method of claim 2, wherein the resulting phase change is calculated by Math 23 200811429 to obtain a thick sound of the liquid crystal cell and a pretilt angle. Then, the theoretical tilt angle of the liquid crystal cell is calculated by the thickness and the pretilt angle, and the phase change of the voltage and the dip distribution calculated by different tilt anchor energies is given. The phase change Compared with the phase curve obtained by the measurement, the second comparison is performed on the results measured by the anthropomorphic, human & alpha re-intercepting voltage, and the anchoring energy is accurately obtained. The method of claim 6, wherein the thickness of the liquid crystal cell and the pre- The dip meter Μ 论 论 缺 缺 缺 缺 缺 缺 缺 缺 缺 缺 缺 缺 缺 缺 缺 Mouse Mouse Mouse Mouse Mouse Mouse Mouse Mouse Mouse Mouse Mouse Mouse Mouse Mouse Mouse 8. As claimed in the patent _ the financial method, the towel, wherein the button is subjected to frictional alignment, so that the liquid crystal cell can be defined in the measurement of the inclination depth of the depression. 9. If the patent application scope The method according to Item 6 or 4, wherein the relevant parameters of the liquid crystal cell n" ru, Kn, 1C33, ε ", ε 〇 _ and the measured liquid crystal cell thickness and pretilt angle 鸠 _ LCD software ' and respectively Given the absence of _, the lack of energy to simulate the addition of different voltages and storage distribution, and then the distribution of different voltages caused by the phase change. 10. The method of claim 1, wherein the towel is stored by varying the magnitude of the voltage applied to the liquid crystal cell and the phase retardation and change caused by the change in the liquid crystal orientation of the liquid crystal cell due to different voltages. The phase change is analyzed by mathematical simulation, and the measured result is compared with the theoretical value, thereby obtaining the tilt anchoring energy of the liquid crystal molecule under the voltage of the liquid crystal cell. . 11. The method of claim 1, wherein the difference frequency interference technique is to measure the liquid crystal cell by using a heterodyne interferometry system of 24 200811429 to obtain the liquid crystal cell under the applied voltage. Phase change. 12. The method of claim 11, wherein the heterodyne interference measurement system measures the phase change of the liquid crystal cell by first emitting a polarized light having two different frequencies and being perpendicular to each other. a laser beam, which generates a reference light and a test light passing through the liquid crystal cell through a beam splitter, and uses the analyzer to respectively generate two mutually perpendicularly polarized light of the reference light and the test light signal. The frequency difference heterodyne interference _ image 'is separately received by the photodetector and then input to the phase meter to determine the phase change. 13. The method of claim U, wherein the heterodyne interference measurement system comprises: a dual frequency laser source for generating a frequency stabilized laser having two different frequencies simultaneously And a polarizing light perpendicular to each other; a beam splitter for generating a reference pupil and a test light acting on the liquid crystal cell by the two mutually perpendicular polarized lights; and the second detecting plate respectively making the reference light And the two vertical lights in the signal light are at 45. The direction generates beat frequency interference; - the two photodetectors respectively receive the test light and the reference light; and - at least one phase meter for determining a phase difference between the test light and the reference light. 14. The method of claim i, wherein the liquid crystal cell is a horizontally arranged liquid crystal cell. The method of claim 1, wherein the range of the fitted high power > 1 is taken within the range of 40-70V. 16·-Determination of the energy characteristics of the nematic data recording system. The system bite-false is used to act on the heterodyne interference measuring device of the liquid crystal cell. The heterodyne interference measuring device comprises: a dual-frequency laser light source, For generating a frequency-stabilized laser, the laser has two polarized lights of different frequencies and perpendicular to each other; a beam splitter for separating the beams containing two mutually perpendicular polarized lights to generate a reference light and a function a test light on the liquid crystal cell; a second detecting plate, and causing the two polarized lights to generate a beat signal heterodyne interference phenomenon, the two photodetectors respectively receiving the test light and the reference light; and at least one phase And determining a phase difference between the test light and the reference light. 17. The assay system of claim 16, wherein the heterodyne interference measuring device is also adapted for anchor energy measurement of a reflective horizontally arranged liquid crystal cell. 26