| 摘要 |
A monitoring circuit includes a first detecting unit, a second detecting unit, a comparing unit and an indicating unit. The first detecting unit is configured for detecting a temperature of a vehicular lamp and sending out a first signal. The second detecting unit is configured for detecting the surrounding temperature and sending out a second signal. The comparing unit is configured for comparing the first signal with the second signal, and controls the indicating unit to show the state of the vehicular lamp according to the compared result. When the first signal is higher than the second signal, the comparing unit controls the indicating unit to show that the vehicular lamp is unlit. When the first signal is equal to or lower than the second signal, the comparing unit controls the indicating unit to show that the vehicular lamp is lit.
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