Liquid Crystal Switchable Light Filter With Adjustable Contrast and Wide Visual Angle
| Publication Number: | SI22066A |
| Application Date: | 20. 5. 2005 |
| Assignee/Applicant: | Jožef Stefan Institute [SI] |
| Inventor: | Bojan Marin, Janez Pirš, Silvija Pirš, Andrej Vrečko |
| Title: | Tekoče kristalni preklopni svetlobni filter s spremenljivim kontrastom in širokim vidnim kotom [SL], Liquid Crystal Switchable Light Filter With Adjustable Contrast and Wide Visual Angle [EN] |
| Description: | The invention describes a new concept of TK switchable light filters which generate high level blanking, which is continuously adjustable under the control of an electric field (up to at least 100.000), optimised/symmetrically balanced for the incidence of light along the perpendicular of the TK switcher level. The new TK switchable light filter also features little dependence from the incidence of light under angles smaller than 90 degrees within the 15 degrees cone as stipulated by the EN 379 international safety standard for personal protection equipment. According to the invention the problem is solved by a modification of the general TN principle of TK displays with a high rotation angle of the TK structure, which enables not only the adjustment of the curve featuring the dependence of light permeability from the control voltage to the specific requirements of the control electronics but also symmetrical balance of the double-refraction properties and thus a high level of angle compensation of the switchable light filter. |
| Drawings: |  |
| Category: | Physical Sciences |
| Technology application codes: | Physical and exact sciences, Protecting man and environment |
| Market application codes: | Other electronics related, Other |
| www: | https://worldwide.espacenet.com/patent/search/family/036694475/publication/SI22066A?q=si22066 |
| Patent offices: | UIL RS |
Extended patent application
| Publication Number: | EP1883854B1 |
| Application Date: | 9. 5. 2006 |
| Assignee/Applicant: | Jožef Stefan Institute [SI] |
| Inventor: | Bojan Marin, Janez Pirš, Silvija Pirš, Andrej Vrečko |
| Title: | Variable Contrast, Wide Viewing Angle Liquid Crystal Light Attenuation Filter |
| www: | https://worldwide.espacenet.com/patent/search/family/036694475/publication/EP1883854B1?q=EP1883854B1 |
Extended patent application
| Publication Number: | WO2006122679A1 |
| Application Date: | 9. 5. 2006 |
| Assignee/Applicant: | Jožef Stefan Institute [SI], Bojan Marin [SI], Janez Pirš [SI], Silvija Pirš [SI], Andrej Vrečko [SI] |
| Inventor: | Bojan Marin, Janez Pirš, Silvija Pirš, Andrej Vrečko |
| Title: | Variable Contrast, Wide Viewing Angle Liquid Crystal Light Attenuation Filter |
| www: | https://worldwide.espacenet.com/patent/search/family/036694475/publication/WO2006122679A1?q=si22066 |
Extended patent application
| Publication Number: | US8026998B2 |
| Application Date: | 9. 5. 2006 |
| Assignee/Applicant: | Jožef Stefan Institute [SI] |
| Inventor: | Bojan Marin, Janez Pirš, Silvija Pirš, Andrej Vrečko |
| Title: | Variable Contrast, Wide Viewing Angle Liquid Crystal Light Attenuation Filter |
| www: | https://worldwide.espacenet.com/patent/search/family/036694475/publication/US8026998B2?q=%20US8026998B2 |