| 摘要 |
PURPOSE:To prevent the visibility from decreasing as much as possible even if one group becomes in a nonlighting state by combining LED lamps at every other one or at every several lamps, connecting in series as groups, and connecting the groups in parallel. CONSTITUTION:One group G1,... are formed by connecting LED lamps L1,... disposed at the prescribed interval at every other one in four series, and these groups are connected in parallel with electrodes +, -. In other words, the first group G1 is composed of the first LED lamp L1, the third LED lamp L3, the fifth LED lamp L, the seventh LED lamp L3, the fifth LED lamp L5, the seventh LED lamp L7, and the second group G2 is composed of the second, fourth,sixth and eighth LED lamps L2, L4 L6, L8. The groups are sequentially formed in this combination. Thus, when the second group G2 becomes in a nonlighting state due to a wire disconnection, the L2, L4, L6, L8 become dark portions, but since they are formed of every other ones, the dark portions are not concentrated in the prescribed range, and the visibility is not remarkably reduced. |
