A display panel comprising a color filter substrate and an array substrate arranged opposite to the color filter substrate, wherein the color filter substrate comprises a display region and a peripheral region (R2') corresponding to a dummy pixel region around the display region, wherein a black matrix of the color filter substrate comprises a light transmitting section in a portion of the peripheral region (R2') corresponding to a dummy pixel unit, and the light transmitting section comprises a first set of light transmitting sections and a second set of light transmitting sections, wherein, each of the first set of light transmitting sections is in a portion that extends along a first side of the display region and corresponds to the dummy pixel unit, and each of the second set of light transmitting sections is in a portion that extends along a second side, opposite to the first side, of the display region and corresponds to the dummy pixel unit, characterised in that: the light transmitting section of the color filter substrate and a light-transmitting region in the dummy pixel region of the array substrate are aligned such that light from the light-transmitting region can pass through the black matrix of the color filter substrate, wherein the array substrate comprises a display region and a dummy pixel region around the display region, the display region having a plurality of pixel units defined by gate lines and data lines intersecting one another, the dummy pixel region having a plurality of dummy pixel units defined by the gate lines and the data lines intersecting one another, wherein the dummy pixel region has marks for identification located in the dummy pixel unit, and the marks include a first set of marks (G1') and a second set of marks (G2'), wherein, each mark in the first set of marks (G1') is in the dummy pixel unit extending along the first side of the display region, and each mark in the second set of marks (G2') is in the dummy pixel unit extending along the second side, opposite to the first side, of the display region, wherein, the light transmitting section of the color filter substrate is aligned with the mark in the array substrate, so that the light from the mark can transmit through the black matrix. wherein, each of the first set of light transmitting sections is in a portion that extends along a first side of the display region and corresponds to the dummy pixel unit, and each of the second set of light transmitting sections is in a portion that extends along a second side, opposite to the first side, of the display region and corresponds to the dummy pixel unit, characterised in that: the light transmitting section of the color filter substrate and a light-transmitting region in the dummy pixel region of the array substrate are aligned such that light from the light-transmitting region can pass through the black matrix of the color filter substrate, wherein the array substrate comprises a display region and a dummy pixel region around the display region, the display region having a plurality of pixel units defined by gate lines and data lines intersecting one another, the dummy pixel region having a plurality of dummy pixel units defined by the gate lines and the data lines intersecting one another, wherein the dummy pixel region has marks for identification located in the dummy pixel unit, and the marks include a first set of marks (G1') and a second set of marks (G2'), wherein, each mark in the first set of marks (G1') is in the dummy pixel unit extending along the first side of the display region, and each mark in the second set of marks (G2') is in the dummy pixel unit extending along the second side, opposite to the first side, of the display region, wherein, the light transmitting section of the color filter substrate is aligned with the mark in the array substrate, so that the light from the mark can transmit through the black matrix. the light transmitting section of the color filter substrate and a light-transmitting region in the dummy pixel region of the array substrate are aligned such that light from the light-transmitting region can pass through the black matrix of the color filter substrate, wherein the array substrate comprises a display region and a dummy pixel region around the display region, the display region having a plurality of pixel units defined by gate lines and data lines intersecting one another, the dummy pixel region having a plurality of dummy pixel units defined by the gate lines and the data lines intersecting one another, wherein the dummy pixel region has marks for identification located in the dummy pixel unit, and the marks include a first set of marks (G1') and a second set of marks (G2'), wherein, each mark in the first set of marks (G1') is in the dummy pixel unit extending along the first side of the display region, and each mark in the second set of marks (G2') is in the dummy pixel unit extending along the second side, opposite to the first side, of the display region, wherein, the light transmitting section of the color filter substrate is aligned with the mark in the array substrate, so that the light from the mark can transmit through the black matrix.