Research on light intensity distribution uniformity of dynamic speed limit signs based on dot matrix LED

Jianping Hu; Bing Wang; Dudu Guo; Zhengfang Xu

doi:10.1117/12.2645692

23 November 2022 Research on light intensity distribution uniformity of dynamic speed limit signs based on dot matrix LED

Jianping Hu, Bing Wang, Dudu Guo, Zhengfang Xu

Author Affiliations +

Proceedings Volume 12302, Seventh International Conference on Electromechanical Control Technology and Transportation (ICECTT 2022); 123020F (2022) https://doi.org/10.1117/12.2645692
Event: Seventh International Conference on Electromechanical Control Technology and Transportation (ICECTT 2022), 2022, Guangzhou, China

Abstract

Aiming at the problem of uneven illuminance distribution of light source array on the surface of dot matrix LED dynamic speed limit sign. In this paper, the distribution threshold of single LED effective illumination value and the superposition distribution model of lattice light source illumination are established through the derivation of basic optical theory and the experimental test of grating aperture isolation method, and then the influence of the theoretical and measured distance between two LEDs on the illumination distribution uniformity of LED array light source is simulated and analyzed by using optical software Trace/Pro. The rectangular LED dot matrix and the 8-shaped LED dot matrix, which is a common element in the speed limit value of the dynamic speed limit sign, are simulated and analyzed with the established lamp bead spacing. The results show that the distance between two light beads plays a key role in the distribution uniformity of illumination. When the central distance between two light beads is 22 mm, the distribution uniformity of illuminance in the central area of the light source and the overlapping area of radiation light from two LED light beads reaches 95.2%, which meets the requirement that the unevenness of speed limit signs should not be greater than 10%.

Citation Download Citation

Jianping Hu, Bing Wang, Dudu Guo, and Zhengfang Xu "Research on light intensity distribution uniformity of dynamic speed limit signs based on dot matrix LED", Proc. SPIE 12302, Seventh International Conference on Electromechanical Control Technology and Transportation (ICECTT 2022), 123020F (23 November 2022); https://doi.org/10.1117/12.2645692

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Light emitting diodes

Light sources

Lamps

Light

Superposition

Distance measurement

Optical simulations

Show All Keywords

Keywords/Phrases

Search In:

Publication Years