| 摘要 |
<p>PURPOSE:To reduce a current necessary for writing an image by the quantity corresponding to that a moving light emitting spot is not only one point and becomes a plurality of the points contained in a block and to extend life by dividing some elements into blocks and performing transmission in a light emitting state at every block. CONSTITUTION:A light emitting element {T1(-1), T2(-1), T3(-1)}, a light emitting element {T1(B), T2(0), T3(0)} and a light emitting element {T1(1), T2(1), T3(1)} show blocks and the elements T1, T2, T3 in the blocks can emit lights lndivisually. The respective blocks are electrically connected to connection diodes D-1, D6, D1 and the light emitting elements are connected to power supply voltage VGK through load resistors RL. The same clock is applied the anodes of the respective blocks. For example, a transmission clock phi2 is applied to the blocks (-1), (1) and a transmission clock phi1 is applied to the block (0). Buffers are respectively provided to respective transmission clock lines phi11, phi12, phi13, phi21, phi22, phi23 so that mutual ON states are not affected each other. In order to obtain the same integrated brightness, the current allowed to flow to an ON-element may be about 1/3 and life is extented as compared with a conventional example.</p> |
