Fullcolor led display system

Details Fullcolor led display system Fullcolor led display system

G - Physics

09

G

G09G 3/32 (2006.01) G09G 5/02 (2006.01)

Patent

CA 2367145

A gradation control circuit of a fullcolor LED display, wherein a high-speed pulse train the pulse intervals of which gradually increase in a constant period is read out of a waveform memory (40) so as to subject gradation data A on each color to inverse gamma correction, the high-speed pulse train is counted by a counter (41), the count B outputted from the counter (41) is compared with the gradation data A on each color by comparators (51, 52, 53), and drive pulses, if A>=B, are generated to turn on constant-current drivers (21, 22, 23).

Cette invention concerne un circuit de commande de gradation pour un affichage à diodes électroluminescentes (LED) tout en couleur, dans lequel un train d'impulsions à grande vitesse, où l'intervalle entre les impulsions augmente graduellement pendant une période constante, est lu d'une mémoire de formes d'ondes (40) de manière à soumettre les données de gradation A de chaque couleur à une correction gamma inverse. Le train d'impulsions à grande vitesse est compté à l'aide d'un compteur (41), le compte B fourni par le compteur (41) est comparé aux données de gradation A de chaque couleur à l'aide de comparateurs (51, 52, 53) et, si A >= B, des impulsions d'actionnement sont générées afin d'activer les actionneurs à courant constant (21, 22, 23).

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