A smoke detecting system comprising a display panel and a smoke detecting circuit, the display panel comprising an adaptor, wherein the smoke detecting circuit is configured to detect smoke inside the display panel and to control the disconnection between the adaptor and a first power source (VCCIN) in case of detecting smoke; wherein the smoke detecting circuit comprises: a smoke sensor, a smoke detecting module and a first switch module; the smoke sensor set within the display panel is connected to an input terminal of the smoke detecting module; an output terminal of the smoke detecting module is connected to a controlling terminal of the first switch module, characterized in that, a first terminal of the first switch module is connected with the display panel (1 10a) via the adaptor of the display panel (1 10a), and a second terminal of the first switch module is connected to the first power source (VCCIN); the smoke sensor is configured to generate an electric signal upon detecting smoke inside the display panel and to transmit the electric signal to the smoke detecting module; the smoke detecting module is configured to control the first switch module to provide disconnection between the adaptor and the first power source (VCCIN) according to the electric signal of the smoke sensor; the first switch module comprises a first switch and a second switch; wherein the first switch is a bipolar NPN transistor, the second switch is a PMOS field-effect transistor; wherein a base electrode of the bipolar NPN transistor is connected to the controlling terminal of the first switch module; a collector electrode of the bipolar NPN transistor is connected to a driving power source via a first resistor; an emitting electrode of the bipolar NPN transistor is connected to ground; the collector electrode of the bipolar NPN transistor is further connected to a gate electrode of the PMOS field-effect transistor; a source electrode of the PMOS field-effect transistor is connected to the first power source (VCCIN); and a drain electrode of the PMOS field-effect transistor is connected to the first terminal of the first switch module. a smoke sensor, a smoke detecting module and a first switch module; the smoke sensor set within the display panel is connected to an input terminal of the smoke detecting module; an output terminal of the smoke detecting module is connected to a controlling terminal of the first switch module, characterized in that, a first terminal of the first switch module is connected with the display panel (1 10a) via the adaptor of the display panel (1 10a), and a second terminal of the first switch module is connected to the first power source (VCCIN); the smoke sensor is configured to generate an electric signal upon detecting smoke inside the display panel and to transmit the electric signal to the smoke detecting module; the smoke detecting module is configured to control the first switch module to provide disconnection between the adaptor and the first power source (VCCIN) according to the electric signal of the smoke sensor; the first switch module comprises a first switch and a second switch; wherein the first switch is a bipolar NPN transistor, the second switch is a PMOS field-effect transistor; wherein a base electrode of the bipolar NPN transistor is connected to the controlling terminal of the first switch module; a collector electrode of the bipolar NPN transistor is connected to a driving power source via a first resistor; an emitting electrode of the bipolar NPN transistor is connected to ground; the collector electrode of the bipolar NPN transistor is further connected to a gate electrode of the PMOS field-effect transistor; a source electrode of the PMOS field-effect transistor is connected to the first power source (VCCIN); and a drain electrode of the PMOS field-effect transistor is connected to the first terminal of the first switch module.