Patent ID: 6974940

Claim:
A monitoring assembly for use in a vehicle, comprising: a monitor device changing the reflectance thereof in response to a control signal; a first light sensor for receiving a first light from a first specified range, and outputting a first signal in response to the intensity of said first light; a second light sensor for receiving a second light from a second specified range partially overlapping with said first specified range, and outputting a second signal in response to the intensity of said second light; and a comparative controller in communication with said first light sensor and said second light sensor, receiving and operating said first signal and said second signals to obtain a first result, and asserting said control signal to adjust the reflectance of said monitor device according to said first result, wherein said comparative controller includes a comparator receiving said first signal and said second signal, comparing said first signal at a first time point and said first signal at a second time point to obtain a first light variation, comparing said second signal at said first time point and said second signal at said second time point to obtain a second light variation, and further comparing said first signal and said second signal at said second time point to obtain a light difference on a condition that said first light variation or said second light variation exceeds a first threshold value.