The invention relates to the technical field of an intelligent switch / socket panel, especially to a backlight button, capable of automatically adjusting brightness according to ambient
light intensity change, of the switch / socket panel. The backlight button comprises a touch button arranged on the switch / socket panel; the touch button is internally provided with a backlight lamp
control circuit; and the backlight lamp
control circuit comprises a backlight lamp, a
triode, a photosensitive sensor and a power supply, wherein one end of the backlight lamp is connected to the power supply via a first
resistor, the other end of the back lamp is grounded, the emitter
electrode of the
triode is connected with the power supply, the collector
electrode of the
triode is connected between the first
resistor and the backlight lamp via a current-limiting
resistor, the base
electrode of the triode is connected with one end of the photosensitive sensor via a second resistor, the other end of the photosensitive sensor is grounded, and a biasing resistor is connected between the emitter electrode and the base electrode of the triode in parallel. The backlight button can adjust the brightness of the touch button automatically according to ambient light change, so that the switch button can be brightened in
daytime to make the button more beautiful, and the switch button is darkened automatically at night when light is dark and does not influence sleeping of users.