An electric device comprising: a first group comprising: a first LED (light-emitting diode) and a second LED wherein the first LED and the second LED are coupled in series; and a first control circuit coupled to the first LED and the second LED; wherein the first control circuit is configured to disable the first LED and enable the second LED in a first mode, and enable the first LED and the second LED in a second mode; and the electric device further comprises: a first signal line coupled to the first group and configured to receive a first voltage in the first mode and the second mode; characterized in that the electric device further comprises: a second group comprising: a third LED and a fourth LED wherein the third LED and the fourth LED are coupled in series; and a second control circuit coupled to the third LED and the fourth LED and configured to disable the third LED and the fourth LED in the first mode, and enable the third LED and the fourth LED in the second mode; and a second signal line coupled to the second group and configured to receive a second voltage in the first mode and receive the first voltage in the second mode; wherein the first group is disposed adjacent to the second group, the first group is connected to the second group, the first group is in a bright state and the second group is in a dark state in the first mode; and the first group and the second group are in the bright state in the second mode. a first group comprising: a first LED (light-emitting diode) and a second LED wherein the first LED and the second LED are coupled in series; and a first control circuit coupled to the first LED and the second LED; wherein a first LED (light-emitting diode) and a second LED wherein the first LED and the second LED are coupled in series; and a first control circuit coupled to the first LED and the second LED; wherein the first control circuit is configured to disable the first LED and enable the second LED in a first mode, and enable the first LED and the second LED in a second mode; and the electric device further comprises: a first signal line coupled to the first group and configured to receive a first voltage in the first mode and the second mode; characterized in that the electric device further comprises: a second group comprising: a third LED and a fourth LED wherein the third LED and the fourth LED are coupled in series; and a second control circuit coupled to the third LED and the fourth LED and configured to disable the third LED and the fourth LED in the first mode, and enable the third LED and the fourth LED in the second mode; and a second signal line coupled to the second group and configured to receive a second voltage in the first mode and receive the first voltage in the second mode; a first signal line coupled to the first group and configured to receive a first voltage in the first mode and the second mode; characterized in that the electric device further comprises: a second group comprising: a third LED and a fourth LED wherein the third LED and the fourth LED are coupled in series; and a second control circuit coupled to the third LED and the fourth LED and configured to disable the third LED and the fourth LED in the first mode, and enable the third LED and the fourth LED in the second mode; and a third LED and a fourth LED wherein the third LED and the fourth LED are coupled in series; and a second control circuit coupled to the third LED and the fourth LED and configured to disable the third LED and the fourth LED in the first mode, and enable the third LED and the fourth LED in the second mode; and a second signal line coupled to the second group and configured to receive a second voltage in the first mode and receive the first voltage in the second mode; wherein the first group is disposed adjacent to the second group, the first group is connected to the second group, the first group is in a bright state and the second group is in a dark state in the first mode; and the first group and the second group are in the bright state in the second mode.