| 摘要 |
<p>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).</p> |
