An array substrate for a display panel, comprising: a base substrate; an array of a plurality of pixel units on the base substrate, each pixel unit comprising at least one subpixel for emitting light of a specific colour, wherein all subpixels of a pixel unit have different colours, at least some of the plurality of pixel units comprising a semiconductor photodetector in at least one subpixel for detecting biometric information; a plurality of first scan lines (Scan1) for driving image display; a plurality of second scan lines (Scan2), each second scan line (Scan2) being connected to a row of subpixels having the semiconductor photodetector in a row of pixel units; and a plurality of read lines (Read), each read line (Read) being connected to each semiconductor photodetector in a column of subpixels having the semiconductor photodetector in a column of pixel units; wherein each subpixel comprises a first transistor for driving the light emission of the subpixel; each semiconductor photodetector comprises a first polarity region connected to a common electrode (Vcom) in a same subpixel, and a second polarity region connected to an electrode configured to provide a reset voltage signal to the second polarity region, and a diode junction connecting the first polarity region and the second polarity region; and each subpixel having the semiconductor photodetector comprises a second transistor, the second transistor comprising a gate node connected to a corresponding second scan line (Scan2), a first node connected to a corresponding read line (Read), and a second node connected to the second polarity region, the electrode configured to provide the reset voltage signal is the second node of the second transistor; characterized in that, the semiconductor photodetector is on a side of the second node of the second transistor distal to the base substrate; a projection of the semiconductor photodetector in plan view of the array substrate is within a projection of the second node of the second transistor in a same subpixel, and the second node of the second transistor is made of a non-transparent material. a base substrate; an array of a plurality of pixel units on the base substrate, each pixel unit comprising at least one subpixel for emitting light of a specific colour, wherein all subpixels of a pixel unit have different colours, at least some of the plurality of pixel units comprising a semiconductor photodetector in at least one subpixel for detecting biometric information; a plurality of first scan lines (Scan1) for driving image display; a plurality of second scan lines (Scan2), each second scan line (Scan2) being connected to a row of subpixels having the semiconductor photodetector in a row of pixel units; and a plurality of read lines (Read), each read line (Read) being connected to each semiconductor photodetector in a column of subpixels having the semiconductor photodetector in a column of pixel units; wherein each subpixel comprises a first transistor for driving the light emission of the subpixel; each semiconductor photodetector comprises a first polarity region connected to a common electrode (Vcom) in a same subpixel, and a second polarity region connected to an electrode configured to provide a reset voltage signal to the second polarity region, and a diode junction connecting the first polarity region and the second polarity region; and each subpixel having the semiconductor photodetector comprises a second transistor, the second transistor comprising a gate node connected to a corresponding second scan line (Scan2), a first node connected to a corresponding read line (Read), and a second node connected to the second polarity region, the electrode configured to provide the reset voltage signal is the second node of the second transistor; characterized in that, the semiconductor photodetector is on a side of the second node of the second transistor distal to the base substrate; a projection of the semiconductor photodetector in plan view of the array substrate is within a projection of the second node of the second transistor in a same subpixel, and the second node of the second transistor is made of a non-transparent material.