| 主权项 |
1. An electronic device, comprising a light-emitting diode (LED) module and at least one backlight adjustment circuit, each backlight adjustment circuit configured to detect the luminance of the light emitted by a corresponding one LED string and adjust the luminance correspondingly, each LED string comprising a plurality of LEDs and a current control resistor connected between a positive voltage port and ground in series; wherein, the backlight adjustment circuit comprises:
a light sensing circuit, configured to sense the luminance of light emitted by one corresponding LED string and produces a corresponding light sensing signal value; a comparison unit, configured to compare the light sensing signal value produced by the light sensing circuit with a preset reference value, and produce a first signal when comparing the light sensing signal value is less than the preset reference value, and produce a second signal when comparing the light sensing signal value is greater than the preset reference value; and an adjustment unit, configured to control to decrease a current flowing through the LED string to decrease the luminance of the light emitted by the LED string, when receiving the first signal produced by the comparison unit; and to control to increase the current flowing through the LED string to increase the luminance of the light emitted by the LED string, when receiving the second signal produced by the comparison unit. |
