JP4872184B2 - Nematic liquid crystal display element display defect resolution method - Google Patents

Description

  The present invention relates to a method for solving a display defect that occurs when a liquid crystal material is injected in a nematic liquid crystal display element.

  In a nematic liquid crystal display element, a trace amount of impurities contained in various materials constituting the liquid crystal display device such as an alignment film, a sealing agent, a color filter, or liquid crystal causes a chromatographic phenomenon on the surface of the alignment film, resulting in an uneven distribution. Adsorption while it is considered to cause display defects. In order to suppress display defects, a method for preventing impurities from adsorbing to the alignment film surface by using a liquid crystal composition containing only liquid crystal molecules having an alkenyl skeleton in the terminal group (see Patent Document 1) is known. Yes. However, in this method, there is a problem that the molecular structure that can be used is limited to those having an alkenyl skeleton at the end when improving liquid crystal physical properties such as response speed and viscosity or developing a new liquid crystal for a liquid crystal display device. there were.

  Also disclosed is a method for increasing the injection rate of liquid crystal and reducing adsorption by adding amine, ether, benzene, toluene, xylene, chloroform, silicon oil or aliphatic hydrocarbon to the liquid crystal mixture (see Patent Document 2). ing. However, although this method has an effect of reducing display defects, there is a problem that display defects cannot be solved completely.

  Furthermore, a method of preventing the adsorption of impurities by deactivating the alignment film surface activated by rubbing by heat treatment (see Patent Document 3) is also disclosed. However, this method has a problem that it is not effective for a display element using an alignment film for VA that does not require rubbing.

  On the other hand, in a ferroelectric liquid crystal display element, a method of controlling alignment defects due to a chevron structure derived from a layer structure peculiar to a ferroelectric liquid crystal by applying a liquid crystal composition to the surface of an alignment film is disclosed (see Patent Document 4). Has been. This method has the function of modulating the SmA-SmC * phase transition temperature of the liquid crystal phase at the interface where the ferroelectric liquid crystal and the applied liquid crystal composition are in contact with the liquid crystal composition applied to the alignment film surface. This is to control alignment defects due to the chevron structure. However, in the case of nematic liquid crystal, since it does not have a layer structure like ferroelectric liquid crystal, it is technically important to apply a liquid crystal composition having the effect of modulating the SmA-SmC * phase transition temperature to the alignment film surface. Does not have. Further, when a liquid crystal compound having a high polarity is applied to the alignment film as described in this document, display defects of the nematic liquid crystal display element due to the chromatographic phenomenon of impurities on the alignment film surface cannot be prevented.

JP-A-9-59626 (Example 3 on page 3) JP-A-9-26582 (Example 1 on page 4, Example 3 and 5 on page 5) JP 2001-305545 A (3 page embodiment) JP2003-98553 (Example 3 on page 3)

  The problem of the present invention is that in a nematic liquid crystal display element, such as stains and unevenness due to a chromatographic phenomenon on the alignment film surface of impurities derived from the material constituting the liquid crystal display device, image sticking, or display failure due to a decrease in voltage holding ratio, etc. It is to provide a method for solving display defects.

  In order to solve the above-mentioned problems, the present inventors have made extensive studies and found that the display defects of the nematic liquid crystal display element can be solved by attaching a nonpolar organic compound to the alignment film surface of the liquid crystal display element. Completed.

  The present invention provides a nematic liquid crystal display element having an alignment film on the opposing surfaces of a pair of opposing substrates, and provides a method for resolving display defects in a nematic liquid crystal display element by attaching a nonpolar organic compound to the alignment film. In manufacturing a nematic liquid crystal display element having a structure in which a liquid crystal is sandwiched between a pair of substrates having electrodes and having an alignment film on at least one of the opposing surfaces of the pair of opposing substrates, the alignment is performed before the liquid crystal is injected. The production method is characterized by comprising a step of applying a nonpolar organic compound dissolved in an organic solvent to a film.

  The present invention also provides a display defect preventing agent for a nematic liquid crystal display device comprising a solution in which a nonpolar organic compound is dissolved in a solvent.

  The display defect solving method of the present invention is useful for improving the characteristics of the nematic liquid crystal display element and for efficient production because it can suppress the display defect that occurs in the liquid crystal injection process in the manufacture of the nematic liquid crystal display element. is there.

  In the method of the present invention, the nonpolar organic compound is preferably composed of atoms composed of carbon and hydrogen, and a hydrocarbon compound formed in combination is preferably used. Furthermore, the molecular weight of the nonpolar organic compound is preferably 180 to 500, and more preferably 200 to 400.

  The nonpolar organic compound may exist in any of a crystal phase, a liquid crystal phase, a glass, and a metastable phase in an atmosphere of 25 ° C. and 1 atm, but a temperature range from −30 ° C. to 120 ° C. It is preferable to use a compound exhibiting a liquid crystal phase, and the absolute value of the relative dielectric constant is preferably 10 or less, and more preferably 3 or less.

  Nonpolar organic compounds are represented by the following general formula (I)

Wherein R ₁ and R ₂ each independently represents an alkyl group having 1 to 18 carbon atoms or an alkenyl group having 2 to 18 carbon atoms,
A and B are each independently a trans-1,4-cyclohexylene group, a trans-1,4-cyclohexenylene group, a decahydronaphthalene-2,6-diyl group, or a 3,3′-spirobicyclobutylene group. Or a bicyclo [2.2.2] octane-1,4-diyl group,
Z ₁ and Z ₂ each independently represent a single bond, a linear or branched alkylene group having 2 to 12 carbon atoms, —CH═CH— or —C≡C—,
n represents an integer of 1 to 3, and when a plurality of B and Z ₂ are present, they may be the same or different. It is preferable that it is a compound represented by this.

In general formula (I), it is preferable that _one of R ₁ and R ₂ represents an alkyl group and the other represents an alkenyl group, R ₁ represents an alkenyl group and R ₂ represents a linear alkyl group. preferable. A and B preferably represent trans-1,4-cyclohexylene. Z ₁ and Z ₂ preferably represent a single bond or a linear alkylene group having an even number of carbon atoms. n preferably represents 1.

  More specifically, the compounds represented by the general formula (I) are particularly preferably compounds represented by the following formulas (2) to (13).

  In the method of the present invention, as a method for attaching the nonpolar organic compound, a method such as dipping, spin coating, spraying, vapor deposition or printing can be used, but spin coating, spraying or dipping is preferable, and spin coating or spraying is more preferable. Spin coating is particularly preferred.

In the case of attaching a nonpolar organic compound by immersion, a method in which one side of the substrate is coated and nonpolar liquid crystal is attached and then peeled off is preferable. In this case, the immersion time is preferably within 30 minutes, preferably within 10 minutes. It is more preferable. As a method for removing the solvent after the immersion, there is a method by heat drying, vacuum drying or gas injection. Among them, after immersion, an inert gas such as nitrogen gas or argon gas is immediately blown off with an air knife or an air gun to remove the solvent, and preferably under reduced pressure of 1.3 × 10 ³ to 1.3 Pa. It is preferable to completely remove the solvent under a reduced pressure of 6.7 × 10 ² to 1.3 Pa.

  When the nonpolar organic compound is adhered by dipping, spin coating or spraying, it is preferable to use a solution in which the nonpolar organic compound is dissolved in a solvent. As long as the solvent used has a solubility capable of dissolving at least 0.2% of the nonpolar organic compound, one kind or two or more kinds of solvents may be mixed and used, and the higher the flash point, the more preferable the specific resistance value. Is preferably as low as possible. For example, acetonitrile, dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N-methyl-2-pyrrolidinone (NMP), γ-butyrolactone (GBL), ethanol, methanol, isopropyl alcohol, acetone, ethyl acetate, dichloromethane, tetrahydrofuran ( THF), chloroform, benzene, toluene, ethylbenzene, xylene, hexane, cyclohexane, cyclohexene, cyclopentane, methylcyclopentane, 2-methylhexane, heptane, octane, nonane, decane, undecane, dodecane, petroleum benzine, ligroin, petroleum There are ether, gasoline or kerosene, but benzene, toluene, ethylbenzene, xylene, hexane, cyclohexane, cyclohexene, cyclopentane, methylcyclopentane , Hydrocarbon solvents such as 2-methylhexane, heptane, octane, nonane, dodecane, petroleum benzine, ligroin, petroleum ether, gasoline or kerosene are preferred, and toluene, hexane and kerosene are more preferred. The hydrocarbon solvent may be a single component or a mixture. The hydrocarbon organic solvent may be either aliphatic or aromatic. Polar solvents such as acetonitrile, dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N-methyl-2-pyrrolidinone (NMP), γ-butyrolactone (GBL), ethanol, methanol, isopropyl alcohol, acetone, and benzene, toluene, ethylbenzene , Xylene, hexane, cyclohexane, cyclohexene, cyclopentane, methylcyclopentane, 2-methylhexane, heptane, octane, nonane, dodecane, petroleum benzine, ligroin, petroleum ether, gasoline or kerosene The solvent obtained is superior in flammability, specific resistance value, or printing characteristics as compared with the case where only the hydrocarbon organic solvent is used. Regarding the polarity of the solvent constituting the display defect preventing agent of the present invention, the absolute value of the relative dielectric constant at 25 ° C. is preferably 10 or less, and more preferably 3 or less. The concentration of the organic solvent solution of the nonpolar organic compound is preferably 0.2 to 10% by mass, and more preferably 0.2 to 2% by mass.

  In the method of the present invention, the alignment film may be applied to any of an organic material, an inorganic material, or a composite material of an organic material and an inorganic material. Specifically, a polyimide alignment film, a polyimide LB film, a cellulose alignment film, and an alignment of a silane coupling agent. Applicable to film, polyvinyl alcohol alignment film, polyamide alignment film, epoxy acrylate alignment film, silanol oligomer alignment film, polyacrylonitrile alignment film, phenol resin alignment film, polyoxazole alignment film, cyclized polyisoprene alignment film or SiO vapor deposition film In particular, it is preferably applied to a polyimide alignment film or a polyamide alignment film.

  The method of the present invention is effective both in the vertical direction and in the horizontal direction as the direction in which the alignment film aligns the liquid crystal molecules. The alignment film is applied to an alignment film that is not subjected to alignment treatment by rubbing or photo-alignment. Although it is effective, it is most preferably applied to a vertical alignment film.

  The method of the present invention can be applied to the case where the liquid crystal material injection method of the nematic liquid crystal display element is either the vacuum injection method or the dropping method, but is most preferably applied to the dropping method.

  The method of the present invention can be applied to any case where the nematic liquid crystal display element is a TN method, STN method, IPS method or VA method, but is most preferably applied to the VA method.

  In the display defect preventing agent of the present invention, it is preferable to use a hydrocarbon compound formed by combining the nonpolar organic compound to be composed of atoms composed of carbon and hydrogen. Furthermore, the molecular weight of the nonpolar organic compound is preferably 180 to 500, and more preferably 200 to 400.

  The nonpolar organic compound may exist in any of a crystal phase, a liquid crystal phase, a glass, and a metastable phase in an atmosphere of 25 ° C. and 1 atm, but a temperature range from −30 ° C. to 120 ° C. It is preferable to use a compound exhibiting a liquid crystal phase, and the absolute value of the relative dielectric constant is preferably 10 or less, and more preferably 3 or less.

More specifically, the nonpolar organic compound is preferably a compound represented by the general formula (I). In general formula (I), it is preferable that _one of R ₁ and R ₂ represents an alkyl group and the other represents an alkenyl group, R ₁ represents an alkenyl group and R ₂ represents a linear alkyl group. preferable. A and B preferably represent trans-1,4-cyclohexylene. Z ₁ and Z ₂ preferably represent a single bond or a linear alkylene group having an even number of carbon atoms. n preferably represents 1.

  The compound represented by the general formula (I) is particularly preferably a compound represented by the formula (2) to the formula (13). Two or more of these compounds can be used.

  As the solvent constituting the display defect preventing agent of the present invention, one or two or more kinds of solvents may be mixed and used as long as the solvent has a solubility capable of dissolving at least 0.2% of the nonpolar organic compound. For example, acetonitrile, ethanol, methanol, isopropyl alcohol, acetone, ethyl acetate, dichloromethane, tetrahydrofuran (THF), chloroform, benzene, toluene, ethylbenzene, xylene, hexane, cyclohexane, cyclohexene, cyclopentane, methylcyclopentane, 2-methyl There are xane, heptane, octane, nonane, decane, undecane, dodecane, petroleum benzine, ligroin, petroleum ether, gasoline or kerosene, but benzene, toluene, ethylbenzene, xylene, hexane, cyclohexane, cyclohexene, cyclopentane, methylcyclopentane 2-methylhexane, heptane, octane, nonane, dodecane, petroleum benzine, ligroin, petroleum ether, gasoline or kerosene Hydrocarbon solvents are preferred, such as down, toluene, hexane, kerosene is more preferable.

If there is a need for a high flash point, acetonitrile, dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N-methyl-2-pyrrolidinone (NMP), γ-butyrolactone (GBL), ethanol, methanol, isopropyl alcohol, Polar solvents such as acetone and benzene, toluene, ethylbenzene, xylene, hexane, cyclohexane, cyclohexene, cyclopentane, methylcyclopentane, 2-methylhexane, heptane, octane, nonane, dodecane, petroleum benzine, ligroin, petroleum ether, gasoline Alternatively, a solvent in which a hydrocarbon organic solvent such as kerosene is mixed is preferable because it has lower flammability than that used only with the hydrocarbon organic solvent.

  If the polarity of the solvent is low, there may be a problem in printing characteristics. Therefore, the polarity of the solvent constituting the display defect preventing agent of the present invention is preferably 10 or less in absolute value of relative dielectric constant at 25 ° C. The following is more preferable.

  In the display defect preventing agent of the present invention, the absolute value of the relative dielectric constant of the nonpolar organic compound at 20 ° C. is preferably 10 or less, more preferably 3 or less, and the organic solvent solution of the nonpolar organic compound The concentration is preferably 0.2 to 10% by mass or less, and more preferably 0.2 to 2% by mass.

Two glass substrates with ITO transparent electrodes were prepared (hereinafter referred to as “substrate A” and “substrate B”).
A vertical alignment film with a thickness of about 100 nm was applied to the transparent electrode surface by spin coating. The applied alignment film was baked at 80 ° C. for 5 minutes, and further baked at 220 ° C. for 2 hours.
Formula (2) as non-polar organic compound

The display defect prevention agent 1 which melt | dissolved the liquid crystal compound represented by this in the toluene organic solvent so that it might become 2 mass% was prepared. The adjusted display defect preventing agent 1 was immersed in the glass substrates A and B with the vertical alignment film for 10 minutes, and the nonpolar organic compound represented by the formula (2) was adsorbed on the surface of the alignment film. After 10 minutes, the glass substrate was pulled up and nitrogen gas was blown to remove the toluene organic solvent, followed by further vacuum drying (6.7 × 10 ² Pa) for 1 hour (hereinafter referred to as alignment film with display defect preventing agent 1). The treated glass substrates are referred to as glass substrate A ₁ ′ and glass substrate B ₁ ′, respectively).

The following nematic liquid crystal composition A using a micro syringe on B ₁ ′ on the glass substrate

2.5 μl was added dropwise. An ultraviolet curable adhesive was applied to the four corners of the glass substrate B ₁ ′, and the glass substrate A ₁ ′ was bonded to the glass substrate B ₁ ′.
The applied voltage of the produced liquid crystal display element 1 was changed, and the liquid crystal display element 1 was observed under crossed Nicols. The produced liquid crystal display element 1 had no uniform display and had a uniform orientation.

In the display failure prevention agent 1 prepared in Example 1, a display failure prevention agent 2 in which the concentration of the nonpolar organic compound represented by the formula (2) was changed to 0.2% by mass was prepared. A liquid crystal display element 2 was produced in the same manner. The applied voltage of the liquid crystal display element 2 was changed, and the liquid crystal cell was observed under crossed Nicols. The liquid crystal display element 2 had a uniform orientation without display defects.
(Comparative Example 1)
In Example 2, the nonpolar organic compound is represented by the formula (14)

In the same manner as in Example 1, a comparative liquid crystal display element 1 was produced. The applied voltage of the comparative liquid crystal display element 1 was changed, and the comparative liquid crystal display element 1 was observed under crossed Nicols. In the comparative liquid crystal display element 1, dripping marks generated at the portion where the liquid crystal was dripped were observed.

  The display defect solving method of the present invention realized a liquid crystal display element having a uniform alignment without display defects, whereas the method of the comparative example could not suppress the occurrence of dripping marks.

  Formulas (2) to (9) as nonpolar organic compounds

Using the compounds represented by the formulas, display defect preventing agents 4 to 10 each consisting of a 0.2 mass% toluene solution were prepared, and liquid crystal display elements 4 to 10 were prepared in the same manner as in Example 1 below. The applied voltage of the liquid crystal display elements 4 to 10 was changed, and the liquid crystal cell was observed under crossed Nicols. As a result, display unevenness and the like were not observed in the liquid crystal display elements 4 to 10, and a liquid crystal display element having a uniform orientation as in Example 1 was realized.

  As the nonpolar organic compound, a display defect preventing agent 11 composed of a 0.2% by mass hexane solution of the compound represented by the formula (2) and a display defect preventing agent 12 composed of a 0.2% by mass benzene solution were prepared, Thereafter, liquid crystal display elements 11 and 12 were produced in the same manner as in Example 1. As a result of changing the applied voltage of the liquid crystal display elements 11 and 12 and observing the liquid crystal cell under crossed Nicols, a liquid crystal display element having a uniform orientation as in Example 1 was realized.

Two glass substrates with alignment films (glass substrate A and glass substrate B) produced in the same manner as in Example 1 were subjected to alignment film surface treatment in the same manner as in Example 1 using display defect prevention agent 2 ( Glass substrate A ₂ ′, glass substrate B ₂ ′). Nematic liquid crystal composition B for VA shown below on glass substrate B ₂ ′

Then, 2.5 μl of the solution was dropped, and a liquid crystal display element 13 was produced in the same manner as in Example 1. As a result of changing the applied voltage of the liquid crystal display element 13 and observing the liquid crystal cell under crossed Nicols, a VA liquid crystal display element having a uniform orientation as in Example 1 was realized.

  The polyimide alignment film was apply | coated to the glass substrate with a comb-tooth IPS electrode, and the opposing glass substrate, respectively with the spin coat method. The applied alignment film was baked at 80 ° C. for 5 minutes, and further baked at 180 ° C. for 1 hour.

  The nematic liquid crystal composition C for IPS shown below is applied to a glass substrate with a comb-field IPS electrode which has been subjected to surface treatment of an alignment film on a glass substrate with an alignment film in the same manner as in Example 1 using the display defect preventing agent 1.

Was added dropwise in the same manner as in Example 1 to prepare a liquid crystal display element 14. As a result of changing the applied voltage of the liquid crystal display element 14 and observing the liquid crystal cell under crossed Nicols, a liquid crystal display element having a uniform orientation as in Example 1 was realized.

Two glass substrates with ITO transparent electrodes similar to those in Example 1 were prepared (glass substrate A and glass substrate B).
A polyimide alignment film for TN was applied to the transparent electrode surface by spin coating. The applied alignment film was baked at 80 ° C. for 5 minutes, and further baked at 180 ° C. for 1 hour (glass substrate A _TN , glass substrate B _TN ).
The glass substrate _BTN was subjected to alignment film surface treatment in the same manner as in Example 1 using the display defect preventing agent 1 (glass substrate _BTN1 ′). Nematic liquid crystal composition D for TN shown below on glass substrate B _TN 1 ′

Was added dropwise in the same manner as in Example 1 to prepare a liquid crystal display element 15. As a result of changing the applied voltage of the liquid crystal display element 15 and observing the liquid crystal cell under crossed Nicols, a liquid crystal display element having a uniform orientation as in Example 1 was realized.

  After filling the display defect preventing agent 1 from the injection port of the liquid crystal cell for image sticking measurement, it was left for 10 minutes. After vacuum drying for 2 hours to remove the solvent, TFT liquid crystal composition E

The liquid crystal cell 1 for burn-in measurement was manufactured by vacuum injection, and burn-in measurement was performed with the autronic LCCS 107 (autronic LCCS 107; drive waveform setting: voltage: 2.06 V, offset voltage: 0.5 V, frequency: 30 Hz, voltage application Time: 120 minutes, transmission cell setting item: voltage: 50 V, voltage application cell: 1, measurement temperature 70 ° C.). As a result, the burn-in value was 0.992.
(Comparative Example 2)
The liquid crystal cell 2 for burn-in measurement was manufactured by vacuum injection of the TFT liquid crystal composition E from the injection port of the liquid crystal cell for burn-in measurement, and burn-in measurement was performed (autronic LCCS107; drive waveform setting: voltage: 2.06 V, offset) Voltage: 0.5 V, frequency: 30 Hz, voltage application time: 120 minutes, transmission cell setting item: voltage: 50 V, voltage application cell: 1, measurement temperature 70 ° C.). The display element of Comparative Example 2 has a burn-in value of 0.972, and it can be seen that the effect of suppressing display defects due to burn-in is inferior to 0.992 of the display element of Example 8.

After filling the display defect preventing agent 1 from the inlet of the liquid crystal cell for measuring the retention rate, it was left for 10 minutes. After performing vacuum drying for 2 hours to remove the solvent, TFT liquid crystal composition E was injected by vacuum to produce a retention rate measurement liquid crystal cell 1, and the retention rate was measured (Toyo Technica VHR-1A, 80 ° C.). . The retention rate of this display element was 90.1%.
(Comparative Example 3)
The TFT liquid crystal composition E was vacuum-injected from the inlet of the liquid crystal cell for holding rate measurement to prepare the liquid crystal cell 2 for holding rate measurement, and the holding rate was measured (Toyo Technica VHR-1A, 80 ° C.). The retention rate of the display element of Comparative Example 3 was 82.6%, which was worse than 90.1% of Example 9. Furthermore, display defects due to a decrease in the retention rate were observed in the display element of Comparative Example 3.

The following formulas (10) to (13) as nonpolar organic compounds

The liquid crystal display elements 16 to 19 were prepared in the same manner as in Example 1 by adjusting the display defect preventing agents 13 to 16 dissolved in 0.2% by mass toluene organic solvent. The applied voltage of the liquid crystal display elements 16 to 19 was changed, and the liquid crystal cell was observed under crossed Nicols. As a result, a liquid crystal display device having a uniform alignment as in Example 1 could be realized by the alignment film surface treatment method of the present invention.

  In the same manner as in Example 1, alignment films were formed on the substrates A and B.

Display defect preventing agents 17 and 18 were prepared by dissolving the nonpolar organic compound represented by the formula (2) in kerosene as a hydrocarbon-based organic solvent so as to be 0.5 and 4% by mass. The adjusted display defect preventing agents 17 and 18 were spin-coated on the glass substrates A and B with the vertical alignment film, and the nonpolar organic compound represented by the formula (2) was adsorbed on the surface of the alignment film. Further, vacuum drying (6.7 × 10 ² Pa) was performed for 1 hour (hereinafter, the glass substrates that had been subjected to the alignment film treatment with the display defect preventing agents 17 and 18 were glass substrate A ₁ ″ and glass substrate B ₁ , respectively. '').

Using a microsyringe, 2.5 μl of the following nematic liquid crystal composition A was dropped onto B ₁ ″ on the glass substrate. The ultraviolet curable adhesive was applied to the four corners of the glass substrate B ₁ ″, and the glass substrate A ₁ ″ was laminated.
The applied voltage of the produced liquid crystal display element 1 was changed, and the liquid crystal display elements 20 and 21 were observed under crossed Nicols. The produced liquid crystal display elements 20 and 21 had no display defect and had a uniform orientation.

In the display failure prevention agent 1 prepared in Example 1, a display failure prevention agent 19 in which the toluene organic solvent was changed to a kerosene organic solvent was prepared, and a liquid crystal display element 22 was produced in the same manner as in Example 1. The applied voltage of the liquid crystal display element 22 was changed, and the liquid crystal cell was observed under crossed Nicols. The liquid crystal display element 22 had no uniform display and had a uniform orientation.

Claims (18)

In the manufacture of a nematic liquid crystal display element having a structure in which a liquid crystal is sandwiched between a pair of substrates having transparent electrodes and having an alignment film on at least one of the opposing surfaces of the pair of opposing substrates, the liquid crystal is injected before the liquid crystal is injected. General formula (I) dissolved in organic solvent in alignment film

(In the formula, R ₁ and R ₂ each independently represent an alkyl group having 1 to 18 carbon atoms or an alkenyl group having 2 to 18 carbon atoms, and these substituents are branched even if they are linear. The shape may be
A and B are each independently trans-1,4-cyclohexylene group, 1,4-phenylene group, trans-1,4-cyclohexenylene group, decahydronaphthalene-2,6-diyl group, 3, Represents a 3′-spirobicyclobutylene group or a bicyclo [2.2.2] octane-1,4-diyl group,
Z ₁ and Z ₂ each independently represent a single bond, a linear or branched alkylene group having 2 to 12 carbon atoms, —CH═CH— or —C≡C—,
n represents an integer of 1 to 3, and when a plurality of B and Z ₂ are present, they may be the same or different. The manufacturing method characterized by including the process of apply | coating the compound represented by this. A method for resolving a display defect in a nematic liquid crystal display element by removing the organic solvent after adhering the compound represented by the general formula (I) in a state dissolved in the organic solvent to the alignment film according to claim 1. The method according to claim 3, wherein the compound represented by the general formula (I) has a molecular weight of 180 to 500. The method according to claim 1, wherein the absolute value of the relative dielectric constant of the compound represented by the general formula (I) at 20 ° C is 10 or less. The method according to claim 1, wherein n represents 1 in the general formula (I). The method according to claim 1, wherein the method for attaching the compound represented by the general formula (I) is dipping, spin coating, spraying, vapor deposition or printing. The method according to claim 6, wherein an organic solvent solution of the compound represented by the general formula (I) is used in dipping, spin coating or spraying. The method according to claim 7, wherein the organic solvent is a hydrocarbon-based organic solvent. The method according to claim 8, wherein the concentration of the nonpolar organic compound in the organic solvent solution is 10% by mass or less. The method according to claim 1, wherein the alignment film is an organic material, an inorganic material, or a composite material of an organic material and an inorganic material. The method according to claim 1, wherein the alignment direction of the liquid crystal molecules by the alignment film is a direction perpendicular to the substrate surface. The method according to claim 1, wherein the alignment direction of the liquid crystal molecules by the alignment film is a horizontal direction with respect to the substrate surface. The method according to claim 1, wherein the liquid crystal material injection method of the nematic liquid crystal display element is a dropping method. The method according to claim 1, wherein the nematic liquid crystal display element is a TN system, an STN system, an IPS system, or a VA system. In the manufacture of a nematic liquid crystal display element having a structure in which a liquid crystal is sandwiched between a pair of substrates having transparent electrodes and having an alignment film on at least one of the opposing surfaces of the pair of opposing substrates, General formula (I) dissolved in organic solvent in alignment film

(In the formula, R ₁ and R ₂ each independently represent an alkyl group having 1 to 18 carbon atoms or an alkenyl group having 2 to 18 carbon atoms, and these substituents are branched even if they are linear. The shape may be
A and B are each independently trans-1,4-cyclohexylene group, 1,4-phenylene group, trans-1,4-cyclohexenylene group, decahydronaphthalene-2,6-diyl group, 3, Represents a 3′-spirobicyclobutylene group or a bicyclo [2.2.2] octane-1,4-diyl group,
Z ₁ and Z ₂ each independently represent a single bond, a linear or branched alkylene group having 2 to 12 carbon atoms, —CH═CH— or —C≡C—,
n represents an integer of 1 to 3, and when a plurality of B and Z ₂ are present, they may be the same or different. The display defect prevention agent of the nematic liquid crystal display element which consists of a solution which melt | dissolved the compound represented by general formula (I) used for the manufacturing method which has the process of apply | coating the compound represented by this in organic solvent . 16. The display defect preventing agent according to claim 15, wherein the molecular weight of the compound represented by the general formula (I) is from 180 to 500. The display defect preventing agent according to claim 15, wherein the absolute value of the relative dielectric constant at 20 ° C of the nonpolar organic compound in the organic solvent solution is in the range of 10 or less. The display defect preventing agent according to claim 15, wherein the concentration of the nonpolar organic compound in the organic solvent solution is 10% by mass or less.