IPC분류정보
국가/구분 |
United States(US) Patent
공개
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0902959
(2014-09-29)
|
공개번호 |
US-0187554
(2016-06-30)
|
우선권정보 |
KR-10-2013-0115216 (2013-09-27); KR-10-2013-0117044 (2013-09-30); KR-10-2014-0129888 (2014-09-29) |
국제출원번호 |
PCT/KR2014/009092
(2014-09-29)
|
발명자
/ 주소 |
- LEE, Dae Hee
- CHANG, Jun Won
- KIM, Young Jin
- Park, Moon Soo
- BELYAEV, Sergey
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
0 |
초록
▼
The present application relates to an optical film and a use thereof. In the present application, through control of an alignment state of a liquid crystal compound in a liquid crystal layer, the liquid crystal layer may exhibit so-called reverse-wavelength dispersion while forming a single thin lay
The present application relates to an optical film and a use thereof. In the present application, through control of an alignment state of a liquid crystal compound in a liquid crystal layer, the liquid crystal layer may exhibit so-called reverse-wavelength dispersion while forming a single thin layer. An optical film including the liquid crystal layer may show optical modulation in a display device such as a liquid crystal display (LCD), organic light emitting device (OLED), or the like, or may be used in various applications, for example, as an optical element capable of improving light utilization efficiency, an element for implementation of a stereoscopic image and quality improvement thereof, and so forth.
대표청구항
▼
1. An optical film comprising a liquid crystal layer, wherein the liquid crystal layer comprises cholesteric-aligned nematic liquid crystal compounds, wherein a thickness of the liquid crystal layer is less than a pitch of the cholesteric-aligned nematic liquid crystal compounds, wherein the liquid
1. An optical film comprising a liquid crystal layer, wherein the liquid crystal layer comprises cholesteric-aligned nematic liquid crystal compounds, wherein a thickness of the liquid crystal layer is less than a pitch of the cholesteric-aligned nematic liquid crystal compounds, wherein the liquid crystal layer has a twist angle in a range from 50 to 300 degrees and wherein the liquid crystal layer satisfies the following Expression 1: R(650)/R(550)>R(550)/R(550)>R(450)/R(550) [Expression 1]where R(650) is an in-plane retardation value of the liquid crystal layer with respect to light with a wavelength of 650 nm, R(550) is an in-plane retardation value of the liquid crystal layer with respect to light with a wavelength of 550 nm, and R(450) is an in-plane retardation value of the liquid crystal layer with respect to light with a wavelength of 450 nm. 2. The optical film of claim 1, wherein the R(650)/R(550) is in a range from 1.01 to 1.19, and the R(450)/R(550) is in a range from 0.81 to 0.99. 3. The optical film of claim 1, wherein a graph in which an x-axis is a thickness of the liquid crystal layer, and a y-axis is an angle between an optical axis of the liquid crystal compound present in the corresponding thickness and an optical axis of the liquid crystal compound present in the lowermost part of the liquid crystal layer (the position where the x is 0) is expressed as a nonlinear graph. 4. The optical film of claim 3, wherein the graph comprises a part in which a slope of the graph increases as the thickness of the liquid crystal layer increases. 5. The optical film of claim 1, wherein the in-plane retardation of the liquid crystal layer with respect to light with a wavelength of 550 nm is in a range of 110 to 220 nm, or in a range of 240 to 350 nm. 6. The optical film of claim 1, wherein the liquid crystal layer has a thickness in a range of 0.1 to 10 μm. 7. The optical film of claim 1, wherein the liquid crystal layer further comprises a chiral agent. 8. The optical film of claim 1, further comprising a base material layer formed on one surface of the liquid crystal layer. 9. An optical laminate comprising: the optical film of claim 1; anda retardation film positioned at one side of the optical film. 10. The optical laminate of claim 9, wherein an angle between a slow axis of the retardation film and an optical axis of the nematic liquid crystal compound positioned most adjacent to the retardation film in the liquid crystal layer is in a range of 5 to 90 degrees. 11. The optical laminate of claim 9, further comprising a polarizing layer. 12. The optical laminate of claim 9, sequentially comprising the polarizing layer, the retardation film, and the optical film, wherein an angle between a light absorbance axis of the polarizing layer and a slow axis of the retardation film is in a range of 10 to 20 degrees, and an angle between a slow axis of the retardation film and an optical axis of the nematic liquid crystal compound positioned most adjacent to the retardation film in the liquid crystal layer of the optical film is in a range of 8 to 16 degrees. 13. The optical laminate of claim 12, wherein a twist angle of the liquid crystal layer is in a range of 36 to 50 degrees. 14. The optical laminate of claim 9, sequentially comprising the polarizing layer, the retardation film, and the optical film, wherein a slow axis of the retardation film and a light absorbance axis of the polarizing layer are perpendicular to each other, and an optical axis of the liquid crystal compound most adjacent to the retardation film in the liquid crystal layer of the optical film is in a range of 50 to 70 degrees. 15. The optical laminate of claim 14, wherein a twist angle of the liquid crystal layer is in a range of 10 to 30 degrees. 16. The optical laminate of claim 9, sequentially comprising the polarizing layer, the retardation film, and the optical film, wherein a slow axis of the retardation film and a light absorbance axis of the polarizing layer are parallel to each other, and an angle between an optical axis of the liquid crystal compound most adjacent to the retardation film in the liquid crystal layer of the optical film and a slow axis of the retardation film is in a range of 15 to 35 degrees. 17. The optical laminate of claim 16, wherein a twist angle of the liquid crystal layer is in a range of 60 to 85 degrees. 18. A method of producing the optical film of claim 1, comprising: inducing a change in concentration according to a thickness of a coating layer of the chiral agent with respect to a liquid crystal coating layer comprising a nematic liquid crystal compound, a chiral agent, and a polymerization initiator; andpolymerizing the nematic liquid crystal compound while the change in concentration of the chiral agent is induced. 19. The method of producing the optical film of claim 18, wherein steps of inducing a change in concentration and polymerizing the liquid crystal compound comprise a process of irradiating a liquid crystal coating layer with ultraviolet rays of an ultraviolet ray A area at an intensity of radiation of 10 to 500 mJ/cm2 at 40 to 80° C.; and a process of irradiating a liquid crystal coating layer having a change in concentration of the chiral agent with ultraviolet rays. 20. A display device comprising the optical film of claim 1.
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