| 摘要 |
<p>PROBLEM TO BE SOLVED: To attempt to increase the speed a clock due to no necessity of the consideration of propagation delay since clock signal is directly inputted to respective driver IC's and easily work out an EMI measure since the level of the clock signal is low even when the clock is increased the speed. SOLUTION: A data transfer clock signal HD-CLK is fed from a controlling part 3 through an interface cable 13 to an LED head 1. Since the interface cable 13 is terminated by a resistor 54, the HD-CLK is transferred nonreflectively and distortionlessly. The comparator 51 of each driver IC directly receives each clock signal in enough low signal level so as to be fed to the shift resistor in each internal circuit 52.</p> |
