Led illumination source/display with individual led...

G - Physics – 09 – G

Patent

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G09G 3/32 (2006.01)

Patent

CA 2522396

An LED area illumination source/display (10) such as an electronic billboard is made up of a number of individual pixels with each pixel including a number of LEDs, e.g., a red (18), blue (19) and green LED (20), with each LED representing a primary color being arranged to be energized separately. At least one light sensor (22) is incorporated into the display for providing a measure of the light emitted from each LED representing a primary color in each pixel. The source/display (10) is susceptible of being self-calibrated by initially energizing the LEDs (18, 19, 20) at less than a maximum level and increasing the energization level as necessary during use to restore the original light output of degraded LEDs.

La présente invention concerne un affichage/source d'éclairage à DEL (10) tel qu'un tableau d'affichage électronique, composé d'un certain nombre de pixels individuels, chaque pixel comprenant un certain nombre de DEL, par exemple une DEL rouge (18), une DEL bleue (19) et une DEL verte (20), chaque DEL représentant une couleur primaire et étant disposée pour être alimentée séparément. Au moins un détecteur optique (22) est incorporé à l'affichage pour fournir une mesure de la lumière émise par chaque DEL représentant une couleur primaire dans chaque pixel. L'affichage/source (10) est susceptible d'être auto-calibrée en fournissant aux DEL (18, 19, 20) une alimentation initiale à un niveau inférieur au niveau maximum, puis en augmentant le niveau d'alimentation selon les besoins en cours d'utilisation, afin de rétablir la sortie lumineuse d'origine des DEL qui ont subi la dégradation.

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