The LED chip is an LED chip provided by the present disclosure, and the related description is not repeated herein.

In this exemplary embodiment, the first extension electrode 111 is electrically connected to the first contact electrode 106, and the first contact electrode 106 is electrically connected to the first semiconductor layer 101. Therefore, the circuit unit applies a voltage to the first semiconductor layer 101 by the first electrical terminal 21. Correspondingly, the second extension electrode 121 is electrically connected to the second contact electrode 107, and the second contact electrode 107 is electrically connected to the second semiconductor layer 103. Therefore, the circuit applies a voltage to the second semiconductor layer 103 by the second electrical terminal 22. After the voltage is applied to the first semiconductor layer 101 and the second semiconductor layer 103, the active layer 102 emits light, and light is emitted from a side close to the first semiconductor layer 101.

In this exemplary embodiment, the first semiconductor layer 101 is an N-type semiconductor layer, and the second semiconductor layer 102 is a P-type semiconductor layer. Correspondingly, the first electrical terminal 21 is a negative connection terminal, and the second electrical terminal 22 is a positive connection terminal.