Backlighting Automotive Telltales with LED Indicators Hewlett Packard

Format:

Conference/Event

Author/Creator:

Hodapp, Mark, author.

Conference Name:

International Congress & Exposition (1990-02-26 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1990

Summary:

AbstractLED technology offers many reliability advantages over incandescent bulbs for the backlighting of automotive telltales. However, up until recently, LED solutions were not practical due to the high cost. In order to get sufficient legend brightness, automotive designers were forced to either use expensive multiple chip LED indicators or expensive metalized reflectors. This paper describes how a single chip LED indicator can be used to illuminate a 15 mm by 15 mm automotive telltale with an inexpensive white molded plastic optical cavity. Using this indicator and cavity, luminous sterances of over 1000 cd/m2 are achievable in the center of the legend and luminous sterances of over 400 cd/m2 are achievable in the corners of the legend. The paper describes a complete telltale solution including this new LED indicator, the reflector design, and optical test results

Notes:

Vendor supplied data

Publisher Number:

900474

Access Restriction:

Restricted for use by site license