| 摘要 |
PURPOSE:To reduce the number of current sources as few as possible while using plural luminous diodes, and to prevent an influence from being given to other luminous diodes as much as possible even though some luminous diode has a trouble. CONSTITUTION:To the members of M (6) sets of luminous diode groups 311 to 366 in which N (6) numbers of luminous diodes are connected in series, current sources 410 to 466 feed the current. Bias circuits 50 to 64 generate control biases to control the current values of the current sources. NXM numbers of luminous diodes are divided into N groups of M numbers respectively, and one luminous diode belonging to each of the M sets of luminous diode groups is provided in each of the N groups, and N groups of luminous diodes are arranged continuously. |
