Please select the most similar patent number from A, B, C and D. Which number is?
A smart base (200) for a watch and a smart watch. The smart base (200) comprises a card holder assembly (210) for installing a SIM card (270), a card cover (220) covering the card holder assembly (210), and a sensor assembly (230) provided on the card cover (220), the sensor assembly (230) being provided to overlap with the SIM card (270); the card holder assembly (210) is used for installing the SIM card (270); and as the sensor assembly (230) is provided on the card cover (220), and when the card cover (220) covers the card holder assembly (210), the sensor assembly (230) is provided to overlap with the SIM card (270). By providing the sensor assembly (230) to overlap with the SIM card (270), the sensor assembly (230) can be installed in the middle of the smart watch without changing the area of the bottom of the smart watch, allowing for a more reasonable structure of the smart watch.
A: A fingerprint recognition apparatus (200) and an electronic device. The fingerprint recognition apparatus (200) has an ultra-thin thickness and good fingerprint recognition performance, and is applicable to an electronic device in an ultra-thin under-screen space. The fingerprint recognition apparatus (200) comprises: a fingerprint sensor (220); an optical component (210) provided above the fingerprint sensor (220) and used for guiding a fingerprint optical signal to enter the fingerprint sensor (220); a processing unit (240) provided on one side of the fingerprint sensor (220); a circuit board (230) provided with at least one circuit board window (2301, 2302), at least one of the fingerprint sensor (220) and the processing unit (240) being provided in the at least one circuit board window (2301, 2302); the circuit board (230) being used for transmitting signals of the fingerprint sensor (220) and the processing unit (240); and a reinforcing plate (250) provided below the circuit board (230) and used for supporting the circuit board (230). An intermediate frame (101) of the electronic device is provided with a through hole (104). An edge area of an upper surface of the reinforcing plate (250) is fixedly connected to an edge area of a lower surface of the intermediate frame (101) in the through hole (104), so that the fingerprint sensor (220) and the processing unit (240) are mounted in the through hole (104) of the intermediate frame (101) by means of the reinforcing plate (250) and the circuit board (230).
B: Provided are a smart watch and a method for assembling the same. The smart watch comprises a watchband and a dial plate (30). The watchband is used for assembling a detachable function module (40). The dial plate (30) is built-in with a micro-processor MCU (301). The detachable function module (40) and the MCU (301) can be electrically connected by connecting the dial plate (30) and the watchband through snap pins (501, 502, 503, 601, 602, 603, 701, 702, 801, 802). A detachable function module can be expanded and installed in the smart watch.
C: A fingerprint recognition apparatus (200) and an electronic device. The fingerprint recognition apparatus (200) comprises: a fingerprint sensor (220); an optical assembly (210) provided on the fingerprint sensor (220) and configured to guide a fingerprint optical signal into the fingerprint sensor (220); a processing unit (240) provided on one side of the fingerprint sensor (220); a circuit board (230) provided with at least one circuit board (230) window, at least one of the fingerprint sensor (220) and the processing unit (240) being provided in the circuit board (230) window; and a reinforcement board (250) provided under the circuit board (230) and configured to support the circuit board (230), the edge of the reinforcement board (250) being bent upward to form an inverted step structure (2501). The upper surface of a middle frame (101) of the electronic device extends downward to form an accommodation area (104). The inverted step structure (2501) of the reinforcement board (250) is configured to be mounted on the edge of the accommodation area (104), such that the fingerprint sensor (220), the processing unit (240), and the circuit board (230) are mounted in the accommodation area (104) of the middle frame (101) by means of the reinforcement board (250).
D: A liquid crystal display assembly and an electronic device. The liquid crystal display assembly comprises: a touch screen (200), an upper substrate (210) arranged in parallel to the touch screen (200), a lower substrate (220) arranged in parallel to the upper substrate (210), an upper polarizer (240) encapsulated between the upper substrate (210) and the lower substrate (220) and attached to one face, not adjacent to a liquid crystal layer (230), of the upper substrate (210) , and a lower polarizer (250) attached to one face, not adjacent to the liquid crystal layer (230), of the lower substrate (220). The liquid crystal display assembly further comprises: at least one fingerprint recognition sensor (260), at least one proximity light sensor (270) and a control chip (280), wherein the at least one fingerprint recognition sensor (260) and the at least one proximity light sensor (270) are arranged between the upper polarizer (240) and the lower polarizer (250), and each fingerprint recognition sensor (260) is electrically connected to the control chip (280) respectively. The problem of resource waste caused due to the fact that all the fingerprint recognition sensors (260) on the whole liquid crystal display screen are controlled to perform fingerprint recognition can be solved, thereby achieving the effect of saving resources.
Answer: B