Patent ID: 8150269
Filing Date: 2012-04-03
Classification: H04B,H05B

Abstract:
1. A lighting device generating radiation including at least visible light for providing illumination, the device comprising at least one light-emitting element comprising a LED or an OLED, emitting radiation having an average light intensity for illumination purpose, a controller coupled to the light-emitting element for modulating said radiation for a data transfer simultaneously with the illumination, wherein the controller is configured in such a way, that simultaneously data signals are transmitted via the generated radiation of said light-emitting element and said modulation is not visible by an observer, wherein the data signals are transmitted to a detecting unit, wherein the controller is a hysteretic controller modulating a current with at least two hysteretic bandwidths, which drives the light-emitting element for radiation without substantially changing the mean current of the light-emitting element, a first bandwidth including a first information of data and a second bandwidth including a second information of data and wherein the hysteretic controller comprises a light modulator circuit and a light-emitting element driver.