Liquid crystal composition and liquid crystal display

Abstract

The embodiment of the invention provides a liquid crystal composition and a liquid crystal display. The liquid crystal composition comprises the following components in parts by weight: 20-35 parts of a monomer as shown in a formula I; 12-22 parts of a monomer of a class IV; 15-30 parts of a monomer of the formula V; 20-35 parts of a monomer represented by a formula VIII; 4-15 parts of a monomer of formula IX; 0.25 to 0.36 part of a polymerizable monomer additive; and 0.015 to 0.025 part of a polymerization inhibitor. According to the liquid crystal composition and the liquid crystal display provided by the embodiment of the invention, the response time is shortened by using the neutral monomer with low rotary viscosity and large elastic constant, and the electrostatic white pill Mura can rapidly disappear.

Description

Technical Field

[0001] This application belongs to the technical field of liquid crystal displays, and particularly relates to a liquid crystal composition and a liquid crystal display. Background Technology

[0002] In the cell assembly process of Liquid Crystal Display (LCD) panels, after liquid crystal is deposited, the upper and lower glass substrates need to be aligned and bonded. This process is carried out in a vacuum chamber. Therefore, vacuum chucks cannot be used to grip and transport the upper glass substrate. The currently mature and common practice is to use electrostatic chucks. However, the strong static electricity of the electrostatic chuck itself will attract ions from the panel to the inner surface of the glass substrate where the chuck is applied. When the electrostatic chuck is removed, the accumulated ions cannot dissipate, resulting in a lateral electric field on both sides of the liquid crystal layer. This causes the liquid crystal at the chuck location to be driven by the electric field. Under backlight, the visual effect is "white spot mura" (the area where the electrostatic chuck was applied has a parasitic electric field due to ion contamination, causing the liquid crystal molecules in that area to be accidentally driven and remain lit, resulting in a circular bright spot seen in a dark screen). This phenomenon may last for more than ten days, leading to customer rejection when the panel is delivered, seriously affecting the reputation of the panel manufacturer.

[0003] Existing research has found that liquid crystal materials have a significant impact on this phenomenon, with different liquid crystal materials exhibiting different behaviors. While there are methods to improve electrostatic mutagenesis through thin-film transistor circuit design, and similar techniques to improve electrostatic chuck mutagenesis through panel design, these suffer from slow response times and limitations in achieving lower driving voltages to meet the requirements of current PSVA (Polymer Sustained Vertical Alignment) display modes. Summary of the Invention

[0004] In view of this, embodiments of this application provide a liquid crystal composition and a liquid crystal display to solve the technical problem in existing liquid crystal displays where the liquid crystal molecules in the area affected by the electrostatic chuck are accidentally driven to remain constantly lit, resulting in circular bright spots visible in dark scenes.

[0005] In a first aspect, embodiments of this application provide a liquid crystal composition comprising the following components in parts by weight: 20-35 parts of Formula I monomer; 12-22 parts of Formula IV monomer; 15-30 parts of type V monomer; 20-35 parts of Formula VIII monomer; 4 to 15 parts of Formula IX type monomer; 0.25~0.36 parts of polymerizable monomer additive; 0.015~0.025 parts of polymerization inhibitor; The structural formula of the monomers mentioned above is shown below:

[0006] Formula I monomers;

[0007] Type IV monomers;

[0008] Type V monomers;

[0009] Type VIII monomers;

[0010] Formula IX class monomer; Among them, R1 and R2 are straight-chain saturated alkanes with 2 to 5 carbon atoms, and R3 and R4 are straight-chain saturated alkanes with 2 to 5 carbon atoms or straight-chain alkenes with one alkene bond.

[0011] Secondly, embodiments of this application provide a liquid crystal display, including a backlight module, a first polarizer, an array substrate, a liquid crystal layer, a color filter substrate, and a second polarizer arranged sequentially. The liquid crystal layer therein comprises the liquid crystal composition described in the first aspect.

[0012] The liquid crystal composition and liquid crystal display provided in this application firstly, through in-depth research on the generation mechanism of "electrostatic chuck white pellets" (the formation of a parasitic electric field by ion adsorption), identified and screened negative polar monomer liquid crystals (such as type I, type IV, and type V monomers) that can fundamentally promote the rapid dissipation of charge. To address the problem of slowed response time caused by the introduction of negative polar monomers, neutral monomers with low rotational viscosity and high elastic constants (such as type VIII and type IX) were creatively selected for combination. The low rotational viscosity monomer directly reduces the internal resistance of liquid crystal molecules during rotation, effectively improving the response speed; the high elastic constant monomer enhances the ability of liquid crystal molecules to recover their initial state, which also helps to accelerate the response speed and improve contrast. This combination constitutes a "functionally complementary" system: the negative polar monomer solves the Mura problem, and the low viscoelastic neutral monomer compensates for the slow response speed. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a liquid crystal display according to an embodiment of this application.

[0015] The following are explanations of the reference numerals in the attached figures: 10. Backlight module; 20. First polarizer; 30. Array substrate; 40. Liquid crystal layer; 50. Color filter substrate; 60. Second polarizer. Detailed Implementation

[0016] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that the embodiments of this application can also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the embodiments of this application with unnecessary detail.

[0017] It should also be understood that the term "and / or" as used in the specification of embodiments of this application and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0019] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0020] Furthermore, in the description of the embodiments and the appended claims of this application, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0021] In the description of embodiments in this application, references to "some embodiments" or "some embodiments" mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in some embodiments," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiments, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. "A plurality" refers to two or more.

[0022] In the manufacturing of LCD (Liquid Crystal Display) panels using PSVA (Polymer Sustained Vertical Alignment) technology, "white spot mura" caused by electrostatic chucks (where the liquid crystal molecules in the area affected by the electrostatic chuck are accidentally driven to remain lit due to parasitic electric fields caused by ion contamination, resulting in circular bright spots visible in dark scenes) is a serious, persistent, and commercially unsustainable industry problem. While various solutions exist, such as in the materials field where current technologies primarily focus on improving the performance parameters of the liquid crystal composition (e.g., increasing Δε to reduce driving voltage and shortening response time), no specific liquid crystal material solutions have been disclosed to address the specific process defect of "electrostatic chuck white spot mura." In the panel design field, some companies have circumvented this problem by improving TFT (Thin Film Transistor) circuit design. However, this is a "back-end" solution for panel manufacturers, increasing design complexity and cost without addressing the root cause in the materials.

[0023] In this application, the inventors first screened out negatively polarized liquid crystal monomers that could rapidly dissipate static electricity, based on the mechanism. However, simply using these monomers in combination with conventional neutral monomers created a new contradiction: while Mura was resolved, the response time slowed down, and the driving voltage could not be further reduced, failing to meet the performance requirements of modern displays. This revealed a key technical contradiction: there is an irreconcilable conflict between "Mura resistance" and "low voltage / fast response." Furthermore, to solve the problem of slowed response time caused by the introduction of negatively polarized monomers, neutral monomers with low rotational viscosity and high elastic constant were creatively selected for combination. The monomer with low rotational viscosity can directly reduce the internal resistance of liquid crystal molecules during rotation, which is the most effective means to improve response speed. The monomer with high elastic constant enhances the ability of liquid crystal molecules to return to their initial state, which also helps to speed up the response speed and improve contrast. This combination constitutes a "functionally complementary" system: the negatively polarized monomer solves Mura, and the low viscoelastic neutral monomer compensates for the slow response speed. Systematic optimization and precise control of multiple performance parameters: This invention does not pursue a single performance in isolation, but achieves a balance of multiple demanding objectives in a single formulation system through the synergistic effect of the aforementioned materials: eliminating electrostatic chuck white pellet Mura, maintaining a low driving voltage (achieved by maintaining sufficient Δε) and a short response time, and precisely controlling the optical parameter Δn within a practical range of 0.095~0.111 to ensure matching with the panel design and achieve the best optical effect.

[0024] The first aspect of this application provides a liquid crystal composition comprising the following components in weight fractions: 20-35 parts of Formula I monomer; 12-22 parts of Formula IV monomer; 15-30 parts of type V monomer; 20-35 parts of Formula VIII monomer; 4 to 15 parts of Formula IX type monomer; 0.25~0.36 parts of polymerizable monomer additive; 0.015~0.025 parts of polymerization inhibitor; The structural formulas of the above monomers are shown in Table 1. In the table, R1 and R2 are straight-chain saturated alkanes with 2 to 5 carbon atoms, and R3 and R4 are straight-chain saturated alkanes with 2 to 5 carbon atoms or straight-chain alkenes with one alkene bond.

[0025] Table 1. Structural formulas of each monomer

[0026] The liquid crystal compositions provided in this application alter the polarity and surface properties of liquid crystal molecules through specific monomer combinations. Some monomers with special functional groups (such as fluorine atoms) can adjust the interaction between liquid crystal molecules and the glass substrate surface, reducing ion aggregation caused by electrostatic adsorption. By optimizing the ratio of the monomers, liquid crystal molecules can more quickly return to their normal alignment after electrostatic chuck action, thereby eliminating the white ball Mura phenomenon. The polymer network formed by polymerizable monomer additives may play a certain stabilizing and regulating role in the alignment of liquid crystal molecules, helping to reduce abnormal driving of liquid crystal molecules caused by electrostatic interaction. Polar monomers such as those of Formula I contain highly electronegative fluorine atoms, and these polar groups give liquid crystal molecules a larger dipole moment, thereby increasing the dielectric anisotropy (Δε) of the liquid crystal. A larger Δε means that the liquid crystal can generate sufficient response under a lower electric field strength, thus achieving a low driving voltage. The synergistic effect of different monomers can optimize the magnitude of Δε, balancing it with other properties while meeting the low driving voltage requirement. Monomers with rigid structures such as those of Formula IV can reduce the rotational viscosity of the liquid crystal. Low rotational viscosity allows liquid crystal molecules to rearrange more quickly under an electric field, thus shortening the response time. Simultaneously, the polymer network formed by polymerizable monomer additives may guide the movement of liquid crystal molecules, further contributing to improved response speed.

[0027] In applications, different monomers have different refractive index characteristics. By precisely adjusting the proportions of monomers of formulas I, IV, V, VIII, and IX, the refractive index anisotropy (Δn) of the liquid crystal composition can be controlled. The molecular structure and electron cloud distribution of these monomers affect their ability to refract light. A reasonable ratio can make Δn reach the optimal range that matches the panel design, achieving the best optical effect.

[0028] In applications, the amount of Formula I monomer used is 20-35 parts. In a preferred embodiment, the amount of Formula I monomer used is 23-30 parts. The six-membered ring and specific substituents (such as fluorine atoms and ester groups) in the Formula I monomer structure can adjust the polarity and steric hindrance of the liquid crystal molecules. Fluorine atoms have high electronegativity and can change the dipole moment of liquid crystal molecules, thereby affecting the dielectric anisotropy (Δε) of the liquid crystal. Dielectric anisotropy is crucial for the response of liquid crystals under an electric field; a suitable Δε can enable the liquid crystal to achieve a fast response at a lower driving voltage. The presence of ester groups affects the arrangement and interaction of liquid crystal molecules, adjusting the phase transition temperature and optical anisotropy (Δn) of the liquid crystal.

[0029] In some embodiments, the monomers of Formula I include at least one of the monomers of the structural formulas shown in the table below:

[0030] The various Type I monomers described above can be used to adjust dielectric properties to achieve low driving voltages. These monomer structures typically contain polar groups such as fluorine atoms. Fluorine atoms have high electronegativity, resulting in uneven charge distribution within the molecule and generating a large dipole moment. A large dipole moment increases the dielectric anisotropy (Δε) of the liquid crystal. In liquid crystal displays, Δε is crucial for the liquid crystal's response to an electric field. Sufficient Δε allows the liquid crystal to produce significant electro-optic effects at low driving voltages, thus achieving low-driving-voltage display characteristics and meeting the requirements of energy saving and low-voltage operation. Furthermore, the combination of benzene rings, fluorine atoms, and other substituents in the monomer structure affects the electron cloud distribution of the molecule and intermolecular interactions. This allows adjustment of the refractive index anisotropy (Δn) of the liquid crystal. By rationally selecting and combining different Type I monomers, Δn can be precisely controlled within a suitable range (e.g., 0.095~0.111) to match the panel design, thereby achieving optimal optical effects, such as improving the display's contrast and viewing angle.

[0031] Furthermore, the above monomers can improve the stability and compatibility of liquid crystals. Monomers of Formula I can form good intermolecular forces with other components, such as van der Waals forces and dipole-dipole interactions. This helps improve the uniformity and stability of the liquid crystal composition, prevents adverse phenomena such as phase separation, and ensures the stability of the liquid crystal display's performance during long-term use. The polar groups and specific molecular configurations in the structure affect the interaction between liquid crystal molecules and the glass substrate surface. The adsorption and arrangement of liquid crystal molecules on the substrate surface can be adjusted, reducing the accumulation of ions on the inner surface of the substrate caused by electrostatic chucks. After the electrostatic chucks are removed, it helps the liquid crystal molecules to return to their normal alignment state more quickly, thereby eliminating the white-ball Mura phenomenon and improving display quality. In a preferred embodiment, monomers of Formula I include Formula I-2, Formula I-4, and Formula I-6. The preferred addition ratios are 10-16 parts of Formula I-2, 8-12 parts of Formula I-4, and 2-5 parts of Formula I-6.

[0032] In applications, the amount of Formula IV monomer used is 12 to 22 parts. In a preferred embodiment, the amount of Formula IV monomer used is 15 to 19 parts. Formula IV monomer is mainly used to adjust the physical properties of liquid crystals, such as viscosity and elastic constant. The multiple six-membered ring structures in its structure increase the rigidity of the molecules, which is beneficial for reducing the rotational viscosity of the liquid crystal. Lower rotational viscosity helps liquid crystal molecules rearrange more quickly under the action of an electric field, thereby shortening the response time. In addition, this structure has good compatibility with other monomers, improving the uniformity and stability of the overall liquid crystal composition.

[0033] In some embodiments, the monomer of formula IV includes at least one of the monomers of the structural formulas shown in the table below:

[0034] The various Type IV monomers described above affect the interaction between liquid crystal molecules and the glass substrate surface, as well as the molecular arrangement order within the liquid crystal. To a certain extent, they adjust the recovery process of liquid crystal molecules after electrostatic adsorption. This helps reduce the interference of ion aggregation caused by electrostatic adsorption on the liquid crystal molecule arrangement, assists in eliminating the white pellet Mura phenomenon caused by electrostatic adsorption, and improves the quality of the displayed image. The multiple six-membered ring structures in Type IV monomers give the molecules a certain degree of rigidity. This rigid structure helps reduce the rotational viscosity of the liquid crystal. Under the action of an electric field, liquid crystal molecules need to rearrange to achieve the switching of display states. Lower rotational viscosity allows the molecules to respond more quickly to changes in the electric field, thereby significantly shortening the response time of the liquid crystal display and meeting the needs of high-speed displays, such as reducing ghosting in dynamic image displays. In a preferred embodiment, Type IV monomers include Type IV-1, Type IV-2, and Type IV-3. The preferred addition ratios are 2-5 parts of Type IV-1, 2-8 parts of Type IV-2, and 7-10 parts of Type IV-3.

[0035] In applications, the amount of monomer of formula V is 15 to 30 parts. In a preferred embodiment, the amount of monomer of formula V is 18 to 28 parts. Monomer of formula V has a regulating effect on the optical properties and electro-optic characteristics of liquid crystals, which helps to optimize the display effect of liquid crystal displays. The benzene ring structure in its structure can provide a certain conjugated system, affecting the electron cloud distribution of liquid crystal molecules, and thus affecting its optical properties, such as refractive index and birefringence. Through synergistic effects with other monomers (formulas IV, VIII, and IX), the overall optical properties of the liquid crystal can be adjusted to meet the requirements of the display.

[0036] In some embodiments, the V-type monomer includes at least one of the monomers with the following structural formulas:

[0037] Both of the above-mentioned type V monomers contain conjugated systems such as benzene rings. The π electron cloud of the benzene ring has specific distribution and movement characteristics. This conjugated structure can affect the electron cloud distribution of liquid crystal molecules, thereby regulating the refractive index anisotropy (Δn) of the liquid crystal. Through synergistic effects with other monomers, the value of Δn can be precisely controlled to be within a suitable range (e.g., 0.095~0.111) to meet the optical performance requirements of panel design and achieve good display effects, such as improving the contrast and color performance of the display. Substituents and conjugated structures in the molecule affect the polarity of the molecule. Suitable polarity helps to regulate the dielectric anisotropy (Δε) of the liquid crystal. To a certain extent, type V monomers can cooperate with other polar monomers to maintain sufficient Δε, thereby ensuring that the liquid crystal can effectively respond to changes in electric field at a lower driving voltage, realizing low-voltage driven display and reducing the power consumption of the display. In a preferred embodiment, type V monomers include type V-1 and type V-2. The preferred addition ratio is 5~12 parts of type V-1 and 11~15 parts of type V-2.

[0038] In applications, the amount of the type VIII monomer used is 20 to 35 parts. In a preferred embodiment, the amount of the type VIII monomer used is 22 to 30 parts. The type VIII monomer can regulate the phase transition behavior and physical stability of the liquid crystal, ensuring that the liquid crystal maintains good performance over a wide temperature range. Its specific molecular structure affects the interaction forces between liquid crystal molecules, thereby regulating the phase transition temperature of the liquid crystal. A suitable phase transition temperature range is crucial for the normal operation of the liquid crystal display under different ambient temperatures. In addition, this monomer helps maintain the uniform alignment of the liquid crystal, improving display quality.

[0039] In some embodiments, the monomer of formula VIII includes at least one monomer of the following structural formulas:

[0040] The monomers of Formula VIII exhibit diverse cyclic structures and substituent combinations. Different cyclic structures (such as benzene rings, alicyclic rings, etc.) and the type and position of substituents significantly affect the spatial configuration of the molecule and intermolecular forces. By altering the strength and type of intermolecular forces, these monomers can adjust the phase transition temperature range of liquid crystals. A suitable phase transition temperature range is crucial for the normal operation of liquid crystal displays under different ambient temperatures. For example, in some wide-temperature-range applications, Formula VIII monomers can ensure that the liquid crystal maintains the nematic phase at low temperatures and does not exhibit premature clearing at high temperatures, guaranteeing stable display under various temperature conditions. The combination of rigid cyclic segments and flexible segments in its molecular structure endows the monomers with unique physical properties. The rigid segments help maintain the uprightness and order of the molecules, while the flexible segments increase the flexibility and fluidity of the molecules. This structural characteristic allows Formula VIII monomers to adjust the viscosity, elastic constant, and other physical properties of liquid crystals. Lower viscosity and a suitable elastic constant facilitate the rapid response of liquid crystal molecules under an electric field, shortening the display's response time and improving dynamic display effects. The conjugated system and substituents in the molecular structure affect the light absorption and refraction properties. Interacting with other liquid crystal monomers, the VIII-type monomers can synergistically adjust optical parameters such as refractive index anisotropy (Δn) and birefringence of the liquid crystal. By precisely adjusting these parameters, the optical properties of the liquid crystal composition can be better matched with the panel design, achieving higher contrast, wider viewing angles, and more vibrant color display. In a preferred embodiment, the VIII-type monomers include VIII-1, VIII-3, VIII-4, and VIII-6. The preferred addition ratios are 9-18 parts of VIII-1, 2-8 parts of VIII-3, 1-5 parts of VIII-4, and 1-8 parts of VIII-6.

[0041] In applications, the amount of the IX-type monomer used is 4 to 15 parts. In a preferred embodiment, the amount of the IX-type monomer used is 5 to 12 parts. The IX-type monomer mainly functions to adjust the electrical properties and response characteristics of the liquid crystal, and may also have a certain impact on the stability of the liquid crystal. Its structural characteristics may give it specific response behavior under the action of an electric field. In combination with other monomers, it can optimize the driving voltage and response time of the liquid crystal. In addition, this monomer may participate in the interaction between liquid crystal molecules, affecting the overall stability of the liquid crystal. The structural formula of the IX-type monomer is shown below:

[0042] Type IX monomers, working in conjunction with other liquid crystal monomers, can fine-tune optical parameters such as the refractive index anisotropy (Δn) of the liquid crystal. By precisely controlling their dosage, it helps to keep Δn within a suitable range (e.g., 0.095~0.111) to match the panel design and achieve optimal optical effects, such as improved display contrast and viewing angle characteristics.

[0043] In some embodiments, the polymerizable monomer additive is used in a maximum amount of 0.25 to 0.36 parts. The polymerizable monomer additive undergoes a polymerization reaction in the liquid crystal composition to form a network structure, thereby improving the performance of the liquid crystal, such as increasing response speed and enhancing stability. Under appropriate conditions, the polymerizable monomer additive can undergo a polymerization reaction to form a polymer network. This network structure can restrict the movement of liquid crystal molecules, reduce the rotational viscosity of the liquid crystal, and thus accelerate the response speed. Simultaneously, the polymer network can also improve the mechanical and thermal stability of the liquid crystal, preventing performance degradation during long-term use.

[0044] In some embodiments, the polymerizable monomer additive includes at least one RM monomer as shown below:

[0045] RM-1 and RM-2 polymerizable monomers are used in the polymerization reaction to form a three-dimensional polymer network in the liquid crystal assembly. This polymer network, dispersed within the liquid crystal matrix, restricts the range of motion of the liquid crystal molecules. On one hand, it reduces the rotational viscosity of the liquid crystal, allowing the liquid crystal molecules to respond more quickly under an electric field, thereby significantly shortening the response time of the display and improving dynamic display effects. On the other hand, the polymer network also enhances the mechanical strength and stability of the liquid crystal, preventing it from flowing or deforming during long-term use or under external forces. In a preferred embodiment, RM-1 is selected as the polymerizable monomer.

[0046] In some embodiments, the amount of polymerization inhibitor used is 0.015 to 0.025 parts. The polymerization inhibitor is mainly used to control the polymerization rate of polymerizable monomer additives, preventing premature polymerization during storage or use. The polymerization inhibitor can react with free radicals or other active substances to inhibit the polymerization reaction. By adding an appropriate amount of polymerization inhibitor, it can be ensured that the polymerizable monomer additives only undergo polymerization when needed, guaranteeing the stability and performance consistency of the liquid crystal composition.

[0047] In some embodiments, the polymerization inhibitor includes at least one antioxidant as shown below:

[0048] In applications, polymerizable monomer additives (such as RM-1 and RM-2) may spontaneously generate free radicals during storage or processing due to factors such as heat, light, or impurities, thus initiating polymerization reactions. Antioxidant-1 and Antioxidant-2 can react rapidly with these free radicals and eliminate them. This effectively prevents polymerizable monomers from polymerizing unnecessarily, ensuring the stability of the liquid crystal composition during storage and extending its shelf life. It also ensures that during subsequent processing and use, the polymerizable monomers can polymerize under appropriate conditions (such as specific wavelengths of light or after the addition of an initiator) as designed, forming a high-performance polymer network. Premature polymerization can alter key properties of the liquid crystal composition, such as viscosity and dielectric properties. Antioxidants maintain the original state and interactions of the components in the liquid crystal composition by inhibiting polymerization reactions. This ensures the consistency of the liquid crystal composition's performance during storage and processing, such as maintaining suitable rotational viscosity to allow the liquid crystal to respond correctly to changes in electric field in the display; maintaining stable dielectric anisotropy (Δε) to ensure accurate grayscale control and low-voltage drive in the display, thereby improving the production yield and performance reliability of the display. Furthermore, in addition to inhibiting polymerization reactions, antioxidants also have antioxidant properties. Some components in the liquid crystal composition may react with oxygen, leading to changes in molecular structure and performance degradation. Antioxidant-1 and Antioxidant-2 can preferentially react with oxygen or capture free radicals generated during oxidation. This protects other components in the liquid crystal composition from oxidation, maintaining the optical properties (such as refractive index anisotropy Δn), electrical properties, and physical stability of the liquid crystal. It also prevents display defects caused by oxidation, such as color changes and reduced contrast, ensuring that the display provides high-quality display effects throughout its entire lifespan.

[0049] In some embodiments, the liquid crystal composition comprises the following components in weight fractions: 23-30 parts of Formula I monomers; 15-19 parts of Formula IV monomers; 18-28 parts of Formula V monomers; 22-30 parts of Formula VIII monomers; 5-12 parts of Formula IX monomers; 0.25-0.36 parts of polymerizable monomer additives; 0.015-0.025 parts of polymerization inhibitors. In some embodiments, the liquid crystal composition comprises the following components in parts by weight: 10-16 parts of Formula I-2; 8-12 parts of Formula I-4; 2-5 parts of Formula I-6; 2-5 parts of Formula IV-1; 2-8 parts of Formula IV-2; 7-10 parts of Formula IV-3; 5-12 parts of Formula V-1; 11-15 parts of Formula V-2; 9-18 parts of Formula VIII-1; 2-8 parts of Formula VIII-3; 1-5 parts of Formula VIII-4; 1-8 parts of Formula VIII-6; 5-12 parts of Formula IX; 0.25-0.36 parts of RM-1; and 0.015-0.025 parts of antioxidant-1. By rationally adjusting the amounts of the above components, the liquid crystal composition can achieve low driving voltage and short response time, while effectively solving the problem of accidental driving of liquid crystal molecules caused by electrostatic chuck action, thereby improving the display quality of the liquid crystal display.

[0050] In order to screen out the above monomers, the inventors conducted the following research: A suitable parent liquid crystal was selected, and the monomers under investigation (Formulas I to VII) were added to the parent liquid crystal at a mass ratio of 10%. The mixture of monomers and parent liquid crystal was poured into a 4-micron vertically aligned liquid crystal test cell. Polarizing films were attached to both surfaces of the liquid crystal test cell, with the absorption axes of the two polarizing films orthogonally aligned. The test cell filled with liquid crystal was bombarded with an electrostatic gun, and the change in transmittance during the process of static electricity dissipation was monitored. When the transmittance of the test cell returned to the transmittance level before bombardment, it was considered that the static electricity had completely disappeared, and the time (s) was recorded. The transmittance was tested using an INSTEC liquid crystal comprehensive parameter tester.

[0051] The names and quantities of the selected parent liquid crystals are shown in Table 2.

[0052] Table 2. Names and Dosage of Parent Liquid Crystal

[0053] The physical properties of the parent liquid crystal are shown in Table 3.

[0054] Table 3. Physical properties of the parent liquid crystal

[0055] The time for the static electricity of the parent liquid crystal to completely disappear is shown in Table 4.

[0056] Table 4. Timeline for complete disappearance of static electricity in the parent liquid crystal

[0057] The names and structural formulas of the monomers are shown in the table below:

[0058] R1 and R2 are both straight-chain saturated alkanes with 2-5 carbon atoms.

[0059] The static electricity disappearance effect of the above monomers in the parent body is shown in Table 5.

[0060] Table 5. Effect of the above monomers on the static electricity disappearance in the parent compound.

[0061] Based on the above data, Formula I and Formula IV are preferred components of the present invention for adjusting the Δε of the liquid crystal composition. However, since display panels generally require a refractive index anisotropy (Δn) between 0.095 and 0.111, which cannot be achieved by Formula I and Formula IV alone, a portion of Formula V monomers, although not as effective as Formula I and Formula IV in eliminating static electricity, are further selected and added to increase the absolute value of Δε and the Δn of the composition.

[0062] Based on the above polar monomers, a neutral monomer, VIII, with the following structure is added to reduce the rotational viscosity (γ1) of the entire system and accelerate the response speed.

[0063] In other embodiments, a neutral monomer with the following structure is added to the above monomer: Formula X; R5 and R6 are each a straight-chain saturated alkane with 2-5 carbon atoms. The preferred addition ratio of the monomer of formula X in this invention is 1-15 parts, and a more preferred addition ratio is 2-12 parts.

[0064] The preferred structures of monomers of type X are shown in the table below:

[0065] Furthermore, in order to obtain a steeper voltage transmittance curve for better low-voltage drive, this application also introduces a monomer of type IX with a larger ratio of flexural elastic constant to developmental elastic constant (K33 / K11) and smaller γ1 compared to formula X.

[0066] The core contribution of this application lies in providing a systematic liquid crystal formulation design approach. By functionally combining polar monomers with specific low viscoelastic neutral monomers, it cleverly balances and simultaneously achieves three crucial yet mutually restrictive properties in PSVA mode: antistatic Mura, low driving voltage, and fast response. This solves a long-standing industry pain point for panel manufacturers.

[0067] This application also provides a liquid crystal display, such as... Figure 1 As shown, it includes a backlight module 10, a first polarizer 20, an array substrate 30, a liquid crystal layer 40, a color filter substrate 50, and a second polarizer 60 arranged sequentially. The liquid crystal layer 40 includes the liquid crystal composition described in the first aspect.

[0068] The liquid crystal display provided in this application embodiment, since it contains the liquid crystal composition described in the first aspect, naturally possesses all the beneficial effects described in the first aspect, namely, the rapid disappearance of static white spots, low driving voltage, and short response time.

[0069] Examples 1-3 Examples 1-3 of this application provide three liquid crystal composition formulations, and the amount and type of each component are shown in Table 6.

[0070] Table 6. Dosage and Component Types of Each Example and Comparative Example

[0071] Comparative Examples 1-2 This comparative example provides two liquid crystal composition formulations, and the amounts and types of each component are shown in the table above. The names and structural formulas of the additional monomers used in the comparative example are as follows; the rest are monomers mentioned above and will not be elaborated upon here.

[0072]

[0073] The physical properties of Comparative Example 1 are shown below:

[0074] The time for complete static electricity dissipation in Comparative Example 1 is shown in the table below:

[0075] The physical properties of Comparative Example 2 are as follows:

[0076] The time for the static electricity to completely disappear in Comparative Example 2 is shown in the table below:

[0077] The physical properties of Example 1 are as follows:

[0078] The time for complete disappearance of static electricity in Example 1 is shown in the table below:

[0079] The physical properties of Example 2 are as follows:

[0080] The time for complete disappearance of static electricity in Example 2 is shown in the table below:

[0081] The physical properties of Example 3 are as follows:

[0082] The time for complete disappearance of static electricity in Example 3 is shown in the table below:

[0083] The data above shows that Δn is 0.1002 for Comparative Example 1, 0.1007 for Comparative Example 2, 0.1000 for Example 1, 0.1110 for Example 2, and 0.0950 for Example 3. These examples can more precisely control Δn within the practical range of 0.095 to 0.111, better matching the panel design and achieving optimal optical effects, such as improved display contrast and viewing angle.

[0084] Regarding response speed, the total response time (TRT) for Comparative Example 1 is 11.0 ms, and for Comparative Example 2 it is 11.1 ms. The TRT for Example 1 is 10.5 ms, for Example 2 it is 10.8 ms, and for Example 3 it is 10.0 ms. The significantly shorter response times of these examples mean that during dynamic image display, screen switching can be faster, reducing ghosting and providing a smoother visual experience. Parameters such as clearing point, viscosity, threshold voltage, dielectric constant, and elastic constant remain relatively stable and within a reasonable range across different examples, indicating that the liquid crystal compositions of these examples maintain good overall performance stability while ensuring optimization of key performance characteristics. For example, the threshold voltage is maintained at approximately 2.04~2.07V, which meets the requirements for low-voltage driving.

[0085] Under different voltages, the time for complete static electricity dissipation in Examples 1-3 was significantly shorter than that in the comparative examples. For example, at 10KV, the average time for complete static electricity dissipation in Comparative Example 1 was 532s, in Comparative Example 2 it was 52s, while in Example 1 it was 27s, in Example 2 it was 27s, and in Example 3 it was 26s. This indicates that the liquid crystal compositions of the examples can eliminate the static electricity effects caused by the electrostatic chuck more quickly, reduce the problem of accidental driving of liquid crystal molecules due to static electricity, avoid display defects such as circular bright spots in dark scenes, and improve the quality and stability of the display image.

[0086] Overall, the liquid crystal compositions of Examples 1-3 exhibit significant advantages in terms of optical performance matching, improved response speed, and static electricity elimination capability, and can better meet the high-performance requirements of liquid crystal displays.

[0087] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0088] The above-described embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them. Although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of the embodiments of this application.

Claims

1. A liquid crystal composition, characterized in that, The components include the following parts by weight: 20-35 parts of Formula I monomer; 12-22 parts of Formula IV monomer; 15-30 parts of type V monomer; 20-35 parts of Formula VIII monomer; 4 to 15 parts of Formula IX type monomer; 0.25~0.36 parts of polymerizable monomer additive; 0.015~0.025 parts of polymerization inhibitor; The structural formula of the monomers mentioned above is shown below: Formula I monomers; Type IV monomers; Type V monomers; Type VIII monomers; Formula IX class monomer; Among them, R1 and R2 are straight-chain saturated alkanes with 2 to 5 carbon atoms, and R3 and R4 are straight-chain saturated alkanes with 2 to 5 carbon atoms or straight-chain alkenes with one alkene bond.

2. The liquid crystal composition according to claim 1, characterized in that, The components include the following parts by weight: 23-30 parts of Formula I monomer; 15-19 parts of Formula IV monomer; 18-28 parts of type V monomer; 22-30 parts of Formula VIII monomer; 5-12 parts of Formula IX type monomer; 0.25~0.36 parts of polymerizable monomer additive; 0.015 to 0.025 parts of polymerization inhibitor.

3. The liquid crystal composition according to claim 1 or 2, characterized in that, The type I monomer includes at least one of the following structural formulas: Formula I-1; Formula I-2; Formula I-3; Formula I-4; Formula I-5; Formula I-6; Formula I-7; Formula I-8.

4. The liquid crystal composition according to claim 1 or 2, characterized in that, The type IV monomer includes at least one of the following structural formulas: Formula IV-1; Formula IV-2; Formula IV-3; Formula IV-4.

5. The liquid crystal composition according to claim 1 or 2, characterized in that, The type V monomer includes at least one of the following structural formulas: Formula V-1; Formula V-2.

6. The liquid crystal composition according to claim 1 or 2, characterized in that, The type VIII monomer includes at least one of the following structural formulas: Formula VIII-1; Formula VIII-2; Formula VIII-3; Formula VIII-4; Formula VIII-5; Formula VIII-6; Formula VIII-7.

7. The liquid crystal composition according to claim 1 or 2, characterized in that, The structural formula of the IX class monomer is shown below: Formula IX.

8. The liquid crystal composition according to claim 1, characterized in that, The polymerizable monomer additive includes at least one RM monomer as shown below: RM-1; RM-2; And / or, the polymerization inhibitor comprises at least one antioxidant as shown below: Antioxidant-1; Antioxidant-2.

9. The liquid crystal composition according to claim 1, characterized in that, Includes the following components in parts by weight: 10 to 16 portions of Formula I-2; Formula I-4, 8 to 12 parts; Formula I-6, 2 to 5 parts; 2 to 5 doses of Formula IV-1; 2 to 8 doses of Formula IV-2; 7-10 doses of Formula IV-3; 5 to 12 portions of Formula V-1; Formula V-2, 11 to 15 parts; Formula VIII-1, 9 to 18 parts; Formula VIII-3, 2 to 8 parts; Formula VIII-4, 1 to 5 parts; Formula VIII-6, 1 to 8 parts; Formula IX, 5-12 copies; RM-1 for 0.25~0.36 servings; 0.015~0.025 parts of antioxidant-1; The structural formulas of the above components are shown below: Formula I-2; Formula I-4; Formula I-6; Formula IV-1; Formula IV-2; Formula IV-3; Formula V-1; Formula V-2; Formula VIII-1; Formula VIII-3; Formula VIII-4; Formula VIII-6; Formula IX; RM-1; Antioxidant-1.

10. A liquid crystal display, characterized in that, It includes a backlight module, a first polarizer, an array substrate, a liquid crystal layer, a color filter substrate, and a second polarizer arranged in sequence. The liquid crystal layer comprises the liquid crystal composition according to any one of claims 1 to 9.

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