| 摘要 |
<p>PURPOSE:To improve the reproducibility of dot with increase of a luminous intensity and unify the luminous intensity in the direction of horizontal scanning by connecting in parallel a plurality of switch circuits for controlling lighting per block to respective blocks through matrix wiring means. CONSTITUTION:Individual LED elements 1a in each LED block 1A are connected in parallel with corresponding switch elements 13a, so that a luminous intensity of the LED element 1a increases and the reproducibility of dot will be improved. In order to provide a plurality of he switch circuits 13A, 13B, the LED blocks 1A are connected to each switch circuit 13A, 13B through matrix wiring means 3 respectively in such a manner, for example, that a LED block 1N at the remotest end position from a switch circuit 13A becomes a LED block 1N at the nearest start position to other switch circuit 13B, so that sums of lengths of the wiring lines among the LED elements 1a corresponding to the switch elements 13a in the switch circuits 13A, 13B can be made to be nearly the same. As a result, currents flowing to all LED elements 1a in the clocks 1A become constant, so that uniform dot patterns can be formed.</p> |
