Trans-polymer-dispersed liquid crystal material composition, substrate, and display device

Abstract

Disclosed is a trans-PDLC liquid crystal material composition, including a vertical alignment agent, a liquid crystal material, and an acrylic monomer. Molecules of the vertical alignment agent include polar groups and non-polar groups. The vertical alignment agent can reduce surface energy of liquid crystal molecules in a polymer matrix and increase contact angle, so that the liquid crystal molecules can be arranged in a vertical way.

Claims

1. A trans-polymer-dispersed liquid crystal material composition, comprising a vertical alignment agent, a liquid crystal material, and an acrylic monomer, wherein molecules of the vertical alignment agent comprise polar groups and non-polar groups; wherein the acrylic monomer is selected from compounds shown in formula (ii) or formula (iii) ##STR00005##

2. The liquid crystal material composition according to claim 1, comprising 0.01%-5 wt % of the vertical alignment agent, 78%-90 wt % of the liquid crystal material, and 8%-20 wt % of the acrylic monomer.

3. The liquid crystal material composition according to claim 1, wherein a general formula of the vertical alignment agents is Q-A-R (I), wherein: Q is a polar group, selected from amino, OH, COOH, SH, CN, Si(CH3)3, Si(OCH3)3, or SiCl3; A is a linking group, comprising flexible linking groups and/or rigid linking groups; and R is a non-polar group, selected from substituted or un-substituted straight-chain or branched-chain alkyl groups of C3-20, wherein one or more CH2- groups can be optionally substituted by O, CONH, COO, OCO, CO, or CHCH groups, and wherein one or more hydrogen atoms can be optionally substituted by fluorine atoms or chlorine atoms.

4. The liquid crystal material composition according to claim 3, wherein a general formula of the flexible linking groups is (CH2)m-(II), wherein: 1m8; and one or more CH2- groups can be optionally substituted by O, S, CO, COO, OCO, OCOO, OCH2-, or CH2O groups.

5. The liquid crystal material composition according to claim 3, wherein a general formula of the rigid linking groups is ##STR00006## wherein: A is one or more kinds of five-membered rings, six-membered rings, benzene rings or aromatic fused rings; 1n6; and one or more hydrogen atoms in ring A can be optionally substituted by halogen atoms, alkyl groups, alkoxy groups or ester groups.

6. The liquid crystal material composition according to claim 3, wherein the vertical alignment agent comprises one or more compounds shown in formula (IV) to formula (VIII): ##STR00007##

7. The liquid crystal material composition according to claim 1, wherein the liquid crystal material is a negative liquid crystal material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The drawings are provided for further understanding of the present disclosure, and constitute one part of the description. They serve to explain the present disclosure in conjunction with the embodiments, rather than to limit the present disclosure in any manner. In the drawings:

(2) FIG. 1 schematically shows transmission of light in a PDLC display device when no external voltage is applied;

(3) FIG. 2 schematically shows transmission of light in a PDLC display device when an external voltage is applied;

(4) FIG. 3 schematically shows transmission of light in a trans-PDLC display device when no external voltage is applied; and

(5) FIG. 4 schematically shows transmission of light in a trans-PDLC display device when an external voltage is applied.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(6) Technical solutions of the present disclosure will be illustrated further hereinafter in combination with specific embodiments.

Embodiment 1

(7) (1) A trans-PDLC liquid crystal material composition is prepared, using 3 wt % of a vertical alignment agent, 85 wt % of a negative liquid crystal material, and 12 wt % of an acrylic monomer.

(8) The vertical alignment agent is OHCH.sub.2CH.sub.2OOCH.sub.2CH.sub.2OOCH.sub.2CH.sub.2OC.sub.12H.sub.15. The negative liquid crystal material is a compound shown in formula (IX). The acrylic monomer is a compound shown in formula (i).

(9) (2) The trans-PDLC liquid crystal material composition is coated on a CF substrate, so as to form a CF substrate material.

(10) (3) In a vacuum environment, the CF substrate material and a TFT substrate are fitted together and sealed with a sealant which is then cured by heating, so as to form a liquid crystal cell.

(11) (4) The liquid crystal cell is treated with ultraviolet irradiation, so as to form a trans-PDLC display device. A wavelength of ultraviolet light used is 365 nm, illuminance thereof is 85 mW/cm.sup.2, and radiation time is 15 min.

Embodiment 2

(12) (1) A trans-PDLC liquid crystal material composition is prepared, using 1 wt % of a vertical alignment agent, 84 wt % of a negative liquid crystal material, and 15 wt % of an acrylic monomer.

(13) The vertical alignment agent is a compound shown in formula (V). The negative liquid crystal material is a compound shown in formula (X). The acrylic monomer is a compound shown in formula (ii).

(14) (2) The trans-PDLC liquid crystal material composition is coated on a TFT substrate, so as to form a TFT substrate material.

(15) (3) In a vacuum environment, a CF substrate and the TFT substrate material are fitted together and sealed with a sealant which is then cured by ultraviolet irradiation, so as to form a liquid crystal cell.

(16) (4) The liquid crystal cell is treated with ultraviolet irradiation, so as to form a trans-PDLC display device. A wavelength of ultraviolet light used is 330 nm, illuminance thereof is 70 mW/cm.sup.2, and radiation time is 20 min.

Embodiment 3

(17) (1) A trans-PDLC liquid crystal material composition is prepared, using 0.01 wt % of a vertical alignment agent, 90 wt % of a negative liquid crystal material, and 9.99 wt % of an acrylic monomer.

(18) The vertical alignment agent is a compound shown in formula (VI). The negative liquid crystal material is a compound shown in formula (XI). The acrylic monomer is a compound shown in formula (iii).

(19) (2) The trans-PDLC liquid crystal material composition is coated on a CF substrate and a TFT substrate, so as to form a CF substrate material and a TFT substrate material.

(20) (3) in a vacuum environment, the CF substrate material and the TFT substrate material are fitted together and sealed with a sealant which is then cured by ultraviolet irradiation, so as to form a liquid crystal.

(21) (4) The liquid crystal cell is treated with ultraviolet irradiation, so as to form a trans-PDLC display device. A wavelength of ultraviolet light used is 320 nm, illuminance thereof is 80 mW/cm.sup.2 and radiation time is 30 min.

Embodiment 4

(22) (1) A trans-PDLC liquid crystal material composition is prepared, using 2 wt % of a vertical alignment agent, 78 wt % of a negative liquid crystal material, and 20 wt % of an acrylic monomer.

(23) The vertical alignment agent is a compound shown in formula (VII). The negative liquid crystal material is a compound shown in formula (XI). The acrylic monomer is a compound shown in formula (iii).

(24) (2) The trans-PDLC liquid crystal material composition is coated on a CF substrate and a TFT substrate, so as to form a CF substrate material and a TFT substrate material.

(25) (3) In a vacuum environment, the CF substrate material and the TFT substrate material are fitted together and sealed with a sealant which is then cured by ultraviolet irradiation, so as to form a liquid crystal cell.

(26) (4) The liquid crystal cell is treated with ultraviolet irradiation, so as to form a trans-PDLC display device. A wavelength of ultraviolet light used is 380 nm, illuminance thereof is 100 mW/cm.sup.2 and radiation time is 25 min.

Embodiment 5

(27) (1) A trans-PDLC liquid crystal material composition is prepared, using 5 wt % of a vertical alignment agent, 87 wt % of a negative liquid crystal material, and 8 wt % of an acrylic monomer.

(28) The vertical alignment agent is a compound shown in formula (VIII). The negative liquid crystal material is a mixture of compounds shown in formula (X) and formula (XI). The acrylic monomer is a compound shown in formula (ii).

(29) (2) The trans-PDLC liquid crystal material composition is coated on a CF substrate, so as to form a CF substrate material.

(30) (3) In a vacuum environment, the CF substrate material and a TFT substrate are fitted together and sealed with a sealant which is then cured by heating, so as to form a liquid crystal cell.

(31) (4) The liquid crystal cell is treated with ultraviolet irradiation, so as to form a trans-PDLC display device. A wavelength of ultraviolet light used is 400 nm, illuminance thereof is 90 mW/cm.sup.2, and radiation time is 5 min.

(32) It is found through tests that contrast of trans-PDLC display devices in the present disclosure is 13-14 and penetration rate thereof is 89%-92%. Contrast of traditional PDC display devices is 5-6 and penetration rate thereof is 75%. It can be seen that trans-PDLC in the present disclosure can remarkably increase the contrast and the penetration rate.

(33) Values mentioned in the present disclosure comprise all the values at one-unit intervals between minimum ones and maximum ones, if there are only two units therebetween. For example, if quantity of a component, or technical variables such as temperature, pressure, time, etc. are declared to be 50-90, it means that values such as 51-89, 52-88, . . . , 69-71, etc. are enumerated in detail in the description. As for values that are not integers, it can be considered to choose 0.1, 0.01, 0.001, or 0.0001 as a unit. These are only some examples which are particularly pointed out. In the present disclosure, all possible combinations of values enumerated between minimum ones and maximum ones in a similar way are deemed as open to the public.

(34) It should be noted that, the above embodiments are only used for illustrating, rather than restricting the present disclosure. The present disclosure is illustrated in detail in combination with typical embodiments hereinabove, but it should be understood that, words used therein are descriptive and explanatory words, rather than restrictive words. Those skilled in the art can make revisions to the present disclosure without departing from the protection scope of claims and make amendments to the present disclosure without departing from the spirit and scope of the present disclosure. Though the present disclosure involves particular methods, materials and embodiments, it does not mean that the present disclosure is limited by the specific embodiments disclosed herein. On the contrary, the present disclosure can be extended to all other methods and applications with identical functions.

DESCRIPTION OF THE REFERENCE SIGNS

(35) 1 substrate 2 polymer 3 positive liquid crystal material 4 transmitted light 5 negative liquid crystal material