Estimation of the louvers influence on LED video display image visibility

Author

Svilainis, Linas ; Dumbrava, Vytautas

Author_Institution

Dept. of Signal Process., Kaunas Univ. of Technol., Kaunas, Lithuania

fYear

2009

fDate

22-25 June 2009

Firstpage

571

Lastpage

576

Abstract

Sun and ambient light is a serious problem for outdoor LED video displays. Shading the front-face surface by louvers implementation is used in majority of LED displays, but louvers influence the LED directivity. The analytical method is developed for image visibility estimation. The louver geometry and position are taken into account. LED FFP goniometry is used for large LED batch and results later averaged. The averaged FFP is then approximated by Gaussian analytical function. Obtained function can be used to calculate the visibility of display image at various viewing distances.

Keywords

Gaussian distribution; LED displays; video equipment; visibility; Gaussian analytical function; LED FFP goniometry; LED video display image visibility; image visibility estimation; louver geometry; louvers influence; outdoor LED video displays; Coordinate measuring machines; Geometry; Goniometers; Image analysis; Image quality; Large screen displays; Light emitting diodes; Shape; Sun; Video signal processing; LED directivity approximation; LED display directivity; LED video display; display louvers;

fLanguage

English

Publisher

ieee

Conference_Titel

Information Technology Interfaces, 2009. ITI '09. Proceedings of the ITI 2009 31st International Conference on

Conference_Location

Dubrovnik

ISSN

1330-1012

Print_ISBN

978-953-7138-15-8

Type

conf

DOI

10.1109/ITI.2009.5196149

Filename

5196149