Analog driver for led or similar display element

Details Analog driver for led or similar display element Analog driver for led or similar display element

G - Physics

09

G

G09G 3/32 (2006.01) G09G 3/36 (2006.01)

Patent

CA 2368386

The analog driver (10) for a display device which is controlled by current, such as an LED, includes a strobed analog input which charges a storage capacitor (18). The voltage across the storage capacitor (18) is fed to the positive input of a comparator (22). The negative input of the comparator (22) receives the voltage from a feedback resistor (30) which is in series with the drive voltage, the drive FET (28) (with a gate connected to the output of the comparator (22)) and the light emitting device. Additionally, a reset FET (32) is provided in parallel with the storage capacitor (18). Displays can be manufactured by a series of panels, each of the panels including an array of these drivers and light emitting devices, along with appropriate control circuitry.

L'invention concerne un circuit d'attaque analogique (10) destiné à un dispositif d'affichage commandé par le courant, par exemple, à une diode lumineuse LED. Le circuit comprend une entrée analogique à effet stroboscopique qui charge un condensateur de stockage (18). La tension dans le condensateur de stockage (18) alimente l'entrée positive d'un comparateur (22). L'entrée négative du comparateur (22) reçoit la tension provenant d'une résistance à rétroaction (30) qui est couplée en série à la tension d'alimentation, au transistor à effet de champ FET (28) d'alimentation (dont une grille est connectée à la sortie du comparateur (22)) et au dispositif lumineux. En outre, un transistor à effet de champ FET de mise à zéro (32) est connecté en parallèle avec un condensateur de stockage (18). Cette invention permet de fabriquer des afficheurs à partir de plusieurs séries de panneaux, chaque panneau comprenant un réseau de dispositifs lumineux et de circuits d'attaque faisant l'objet de l'invention et possédant des circuits de commande appropriés.

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