TW201022420A - Liquid crystal composite composition and method thereof - Google Patents

Abstract

A composition for a liquid crystal composite is provided. The composition comprises a liquid crystal compound and a nanoparticle. The liquid crystal compound is an optical compensated bend (OCB) liquid crystal. The main chain or the side chain of the nanoparticle has at least one acrylic functional group. The nanoparticle is 0.1 to 2 weight% by weight of the liquid crystal composite.

Description

201022420 VI. Description of the Invention: [Technical Field] The present invention relates to a formulation of a liquid crystal composite, and more particularly to a composition formula of an optically compensated curved liquid crystal composite. [Prior Art] In recent years, the development of related technologies in the flat panel display industry, such as liquid crystal displays (LCDs), has matured. At present, liquid crystal display (LCD) has been widely used in various electronic products, such as a personal computer, a notebook computer, etc., using a thin film transistor display (Thin_Film).

Transistor LCDs, TFT-LCDs) Large-size products, or PDAs, language translators, mobile phones and other small-sized products using Super Twist Nematic (STN) technology can be seen using liquid crystal products. Although the liquid crystal display has the advantages of low radiation and small size and shortness, when the user views the liquid crystal display from different angles, the contrast ratio decreases as the viewing angle increases, and the viewing angle is limited. In addition to ®, the speed of liquid crystal display devices currently on the market is still too small, so that the display of motion pictures is often blurred due to image retention. Therefore, how to increase the viewing angle of the liquid crystal display and increase its response speed to improve the image quality of the liquid crystal display is one of the topics of the industry today. In order to solve the above problems, a liquid crystal display device using optically compensated birefringence (OCC) has been developed. In the OCB operation mode, the display device has a high reaction rate and a wide viewing angle, and thus is extremely high. Developmental. 201022420 'However, the liquid crystal display device of the optical compensation mode currently on the market has a long-term problem. For example, the 0CB mode has no electric field and its liquid

The crystal molecules are parallel to the splaym〇de of the panel, and in the case of the preferred 〇CB.Mode operation, the liquid crystal molecules must be in their bent state (bendm〇de). In order to realize the curved arrangement of the liquid crystal molecules, it is necessary to set a predetermined time for each liquid crystal molecule to twist the liquid crystal molecules from the divergent state to the bent position at the proper position for the normal operation. ❿ ′′′ In order to make the liquid crystal molecules twist from the divergent state to the bent state at the appropriate position, the cost of the driving voltage and its relative response speed will cause the optical compensation mode liquid crystal display device to have a delayed reaction effect. . SUMMARY OF THE INVENTION In view of the above, in order to solve the above problems, it is a primary object of the present invention to provide a composition formula of a liquid crystal composite which can improve the response speed of a liquid crystal display. Further, another object of the present invention is to provide a liquid crystal composite manufacturing method which improves the response speed of a liquid crystal display. Furthermore, another object of the present invention is to provide a liquid crystal display device for improving the response speed of a conventional liquid crystal display. In order to achieve the above object of the present invention, a composition formula of the liquid crystal composite of the present invention comprises a liquid crystal compound and a nanoparticle, wherein the liquid crystal compound is an optically compensated curved liquid crystal compound (〇CB Hquid crystal) And the nanoparticle has at least one acryl functional group on the main chain or the side chain. 201022420' The content of the nanoparticle in the composition of the liquid crystal composite composition in the above invention example is 0.1 to 2 wt% '% by weight Based on the weight of the liquid crystal composite. In the above embodiment of the invention, the acryl functional group is a structure represented by the formula (1). -O-C-C-CHa Formula (1)

• II ΟΗέ ❹ The above invention is a group of nanoparticles selected from the group consisting of zinc oxide, oxidized organisms, and cerium oxide or higher cerium oxide derivatives. In the above embodiments of the invention, the liquid crystal composite can be applied to an optical compensation curved alignment type (OCB) liquid crystal display device. In order to achieve the other object of the present invention, the method for producing a liquid crystal composite of the present invention includes the following steps: first, mixing a liquid crystal compound with one nano particle, the liquid crystal compound is an optical compensation liquid crystal compound, a primary bond of a nano particle or The side button has at least one acryl functional group, wherein the content of the nanoparticles is 〇1 to 2 wt%. After that, the liquid crystal compound and the nano particles are mixed in a liquid crystal cell. Finally, energy is supplied to cause polymerization of the nanoparticle with the liquid crystal compound. In the above embodiment of the invention, the acrylic functional group is a structure represented by the general formula (1). 0 Formula (1) Λ II. -O-C-C-GHa

II CH2 201022420 In the above embodiment of the invention, the nanoparticles are selected from the group consisting of zinc oxide, a derivative of zinc oxide, and a derivative of cerium oxide or higher. In the above embodiment of the invention, the method of injecting the mixed liquid crystal compound and the nanoparticle into the liquid crystal cell is a one-dip pfming process or a vacuum capillary injection process. In the above embodiments of the invention, the energy is an ultraviolet light or an applied voltage. In order to achieve another object of the present invention, a liquid crystal display device of the present invention comprises a first substrate, a second substrate, and a liquid crystal layer. The liquid crystal layer is disposed between the first substrate and the second substrate, and the liquid crystal layer has a liquid crystal composite, wherein the liquid crystal composite is formed by polymerizing a liquid crystal compound and a nano particle, wherein the liquid crystal compound is an optical compensation liquid crystal compound And the nanoparticle has at least one acryl functional group on the main chain or the side chain, and the content of the nanoparticle is 〜1 to 2 wt%. In the above invention examples, the nanoparticles are selected from the group consisting of zinc oxide, a derivative of zinc oxide, and a derivative of cerium oxide or more. In the above embodiment of the invention, the liquid crystal display device is an optical compensation curved alignment type liquid crystal display device. - When nano particles are added to the original liquid crystal compound, the liquid crystal can be quickly turned from the sag state to the curved state, so that the liquid crystal display device can quickly reach the steady state during the initial driving, and the drive circuit without special high voltage is required. Faster response speed (lower response time). The above features and advantages of the present invention will become more apparent and obvious. The following detailed description of the embodiments and the accompanying drawings are set forth below. Cattle 6 201022420 [Embodiment] According to a preferred embodiment of the present invention, an optical compensation curved alignment type liquid crystal display device is disclosed which synthesizes a novel liquid crystal complex by polymerization reaction, and thus, new The liquid crystal composite can greatly reduce the time and power supply required for the optically compensated double-bend type liquid crystal display device to switch from the divergent state to the curved state at the initial driving, and can eliminate the instability between the divergent state and the curved state. The phenomenon is faster than the conventional liquid crystal display device. Referring to FIG. 1, the liquid crystal display device 1A includes a first substrate 2, a aligning layer 22, a second substrate 50, a second alignment layer 52, and a liquid crystal layer 40. The first substrate 20 has a first surface 21, and the second substrate 50 has a second surface 51, wherein the first substrate 20 is disposed in parallel with the second substrate 50, and the first surface 21 is opposed to the second surface 51. The first alignment layer 22 is formed over the first surface 21. The second alignment layer 52 is formed over the second surface 51. The liquid crystal layer 40 is disposed between the first substrate 20 and the second substrate 5 , and the liquid crystal layer has a plurality of liquid crystal composites 42 , wherein the liquid crystal composite 42 is mixed with a liquid crystal compound by a polymerization reaction. It is obtained by reacting with one nanometer particle. The method for producing a liquid crystal composite described above includes the following steps: first, mixing a liquid crystal compound and one nano particle; then, injecting the mixed liquid crystal compound and the nano particle in a liquid crystal cell; finally providing an energy to the nano particle A polymerization reaction occurs with the liquid crystal compound. Further, the above liquid crystal compound is an optical compensation liquid crystal compound, and the above-mentioned nano particles have at least one acrylic functional group on a primary bond or a side chain, and the acrylic functional group is represented by the general formula (1). Structure. 201022420 ο -0-C-C-GH3 Formula (1) ch2 wherein the nanoparticles are selected from the group consisting of an oxidized word, a derivative of zinc oxide, and a derivative of a dioxide dioxide or a cerium oxide. The content of the particles is 0.1 to 3 wt%, and the weight percentage is based on the weight of the liquid crystal composition. Referring to the table, a series of nanoparticles having an acryl functional group as described in the present invention can be cited. The nanoparticles of the invention are exemplified by derivatives of zinc oxide and derivatives of cerium oxide.

No. Λ I. l,4f —---- 1 — a --- . gh2 2 OH 〇@-〇-CH2 -CH —CH2〇-CG-CH3 ch2 士 1 ---—I Table 1 In addition The liquid crystal compound and the green pigment in the liquid crystal cell are formed by a drip-type injection process or a vacuum capillary injection process. In addition, the liquid minus wire and the naprox can be self-assembled by light or heat under the condition of adding a pure starter, wherein the energy source can be ultraviolet light or - applied voltage. In this way, the liquid crystal display can avoid image sticking or delay caused by the residue of the initiator. In addition, the liquid crystal display device of the invention of 201022420 has a faster response speed (lower response time) than the conventional optical compensation double-bend liquid crystal display. The following specific examples and examples are given to illustrate. In the first embodiment, the pure optically compensated curved liquid crystal compound A (ZCE_5〇96) and its liquid crystal compound (ZCE-5096) are doped with liquid crystal compounds B, c, D of different ratios of reactive semiconductor zinc oxide (ΖιιΟ) nanoparticles. E, F as crystal

The liquid crystal layer of the device was not tested, and the zinc oxide (ZnC) nanoparticle was revealed as shown in No. 1 of Table 1, and the particle size of the nanoparticles was 3 to 1. The gap of the liquid crystal cell was 3.90 μιη, and the test results are shown in Table 2. As shown in Table 2 and Table 3, when the nanoparticle is a reactive semiconductor oxidized sputum, it can be found that the optimal condition is 2 wt%, and the response time is determined by The 4 94 coffee (average value) of the unblended Nailai particles increased to 3.77 ms (red contains 2 wt% Zn〇), and its driving voltage was reduced from h93 v (average value) of the unmixed oxygen nanoparticles to (7) v (after mixed). ▲ ΎτλΓΛ -v~Γ____\ I -—— ratio of ΖηΟ r on (ms) r off (ms) r total (ms)

A 0 wt% 1.22

B

C

D 0.1 wt% 0.5 wt% wt% 1.1 0.86 1.03 3.72 X47 3.76 ~4~01 4.94 4.57 4.62 5.1 ^ 2 wt% 1.16 ο 61 ~~—--- F 3 wt% ~〇.99 Τνΐ—~ --~ ~~-_ ~L-_L _Γ〇/ 4.36 201022420 ZnO proportional voltage value (V) A 0 wt% 1.93 _ B 0.1 wt% 1.98 _ C 0.5 wt% 1.85 — D 1 wt% T83 E 2 wt% 1.73 ' F 3 wt% 1.85 Table 3 : Driving voltage data values of ZCE-5096 liquid crystal mixed doped ZnO nanoparticles. The examples were respectively doped with pure optically compensated curved liquid crystal compound A (ZCE-5096) and its liquid crystal compound (ZCE-5096). Liquid crystal compounds of different proportions of reactive semiconductor dioxin (Si〇2) nanoparticles are tested as liquid crystal layers of a crystal display device, wherein the structure of the dioxide (Si〇2) nanoparticle is as shown in The particle size of the nylon is 1G~2G, and the cell gap is 9.9〇. The test results are shown in Table 2. (Si〇 such as f too 1 7 ^ # nanoparticle is - reaction material conductor dioxide oxidation d: sub-time 'can be found mixed with the best conditions for the ο.1 secret particles of 5. 6 dishes (average Value) 2 ms (incorporating 〇. 1 % Si〇2). 201022420 Ratio of SiO2 r on (ms) r off (ms) r total (ms) A 0 wt% 1.24 3.82 5.06 B 0.1 wt% 1.33 2.99 4.32 C 0.5 wt% 1.27 3.08 4.35 D 1 wt% 1.2 ^ 3.18 4.38 E 3 wt% 1.09 3.4 4.49 ❹ Table 4: ZCE-5096 liquid crystal mixed SiO 2 nanoparticles particle response speed value The liquid crystal display device of the present invention The manufacturing method thereof uses a liquid crystal composition containing the added nanoparticle to reduce the time and power supply required for the optical compensation type liquid crystal display device to switch from the divergent state to the curved state at the initial driving, and the radiation supply can be eliminated. The instability between the scattered state and the curved state results in a faster response than the conventional liquid crystal display device. Further, by comparing Table 2, Table 3, and Table Q 4, the liquid crystal display device of the present invention can be known. It is indeed faster than the general optical compensation curved alignment type liquid crystal display device, This invention also has a better competitive ability. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art, without departing from the present invention, The scope of protection of the present invention is defined by the scope of the appended claims. 11 201022420 ^ [Simplified Schematic] FIG. 1 is a schematic cross-sectional view of an optical compensation liquid crystal display of the present invention. [Main component symbol description] 10 liquid crystal display device 20 first substrate 21 first surface 22 first alignment layer 40 liquid crystal layer 42 liquid crystal composite 50 second substrate 51 second surface 52 second alignment layer 12

Claims (1)

201022420 * VII. Patent application scope: 1. A composition formula of a liquid crystal composite, comprising: a liquid crystal compound which is an optically compensated curved liquid crystal compound (〇CB liquid crystal); and a nanoparticle whose main chain Or at least one acrylic functional group on the side chain, wherein the content of the nanoparticle is 〇丨~2 wt〇/〇. 2. The composition according to claim 1, wherein the acrylic functional system is a structure represented by the general formula (1). II 0 II -O-C-C-GHs Formula (1) CHz 13 201022420 provides an energy to cause the nanoparticle to react with the liquid crystal compound to form the liquid crystal composite. 6. The method of claim 5, wherein the Longkeli functional group is a structure represented by the formula (1). The method of claim 5, wherein the nanoparticle is selected from the group consisting of zinc oxide, zinc oxide derivatives, and cerium oxide. A group consisting of derivatives of cerium oxide. 8. The method of claim 5, wherein the method of injecting the mixed liquid crystal compound and the nanoparticle in the liquid crystal cell is a one-drop filling process or vacuum capillary The phenomenon is injected into the process. 10. The method of claim 5, wherein the energy is an ultraviolet light or an applied voltage. 10. A liquid crystal display device comprising: a first substrate; a second substrate; and a liquid crystal layer disposed between the first substrate and the second substrate, the liquid crystal layer having a liquid crystal composite The liquid crystal composite is formed by polymerizing a liquid crystal compound and a nano particle, wherein the liquid crystal compound is an optical compensation 201022420 liquid crystal compound, wherein the nanoparticle has at least one acryl functional group on a primary bond or a side bond, and the nanoparticle The content of the rice particles is 0.1 to 2 wt%. 11. The liquid crystal display device of claim 10, wherein the acrylic functional group is a structure represented by the general formula (1). 〇0 II General formula (1) CC-CHa II CHi 12. The display device according to claim 1G, wherein the nanometer is selected from the group consisting of zinc oxide, an oxidized derivative, and a dioxygen cut. A group consisting of the above derivatives of cerium oxide. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is an optical compensation material array type (〇CB) liquid crystal display device. 15