The invention discloses a display brightness self-adjusting device, a display brightness self-adjusting method and an intelligent wearable device. According to the display brightness self-adjusting device, a
light intensity acquisition unit is used for acquiring the
light intensity of a surrounding environment, converts the acquired
light intensity into a corresponding electrical
signal value, compares the electrical
signal value with a stored previous electrical
signal value, and stores the electrical signal value if the change quantity of the electrical signal value and the previous electrical signal value exceeds a set threshold value, generates an interrupt signal and sends the interrupt signal to a central
processing control unit; the central
processing control unit is used for reading the stored electrical signal value when receiving the interrupt signal and controls a power source
management unit according to the electrical signal value so as to make the power source
management unit output corresponding
power supply voltage to a display unit; and the display unit controls the display brightness of a display screen in accordance with the received
power supply voltage. With the display brightness self-adjusting device and the display brightness self-adjusting method of the invention adopted, the automatic and humane adjustment of the display brightness of the display screen can be realized, so that the display brightness of the display screen can be suitable for ambient light intensity, and excessive
power consumption caused by single brightness can be prevented, standby time can be prolonged, and user experience can be increased.