A display device, comprising an array substrate, a color filter substrate, a liquid crystal molecular layer located between the array substrate and the color filter substrate, and a light source located on a side of the array substrate away from the color filter substrate, wherein the array substrate comprises a plurality of pixel electrodes arranged in arrays on a base substrate, the array substrate further comprises a signal line (12, 121) located on a different layer from the plurality of pixel electrodes, a vertical projection of the signal line on the base substrate is located between vertical projections of two adjacent pixel electrodes of the plurality of pixel electrodes on the base substrate, the vertical projections of the two adjacent pixel electrodes and the vertical projection of the signal line have two gaps therebetween, wherein the array substrate further comprises at least one light-leakage-proof electrode arranged to be insulated from the pixel electrodes and the signal line, and a vertical projection of the light-leakage-proof electrode on the base substrate completely covers the two gaps between the vertical projections of the two adjacent pixel electrodes and the vertical projection of the signal line, and also completely covers the vertical projection of the signal line on the base substrate, the layer of the light-leakage-proof electrode is located on a side of the layer of the pixel electrodes away from the signal line, and the layer of the light-leakage-proof electrode and the layer of the pixel electrodes have a first insulation layer disposed therebetween, wherein the display device further comprises a lower polarizer on the array substrate and an upper polarizer on the color filter substrate, a transmission axis direction of the lower polarizer and a transmission axis direction of the upper polarizer are perpendicular to each other, wherein the color filter substrate comprises a common electrode, wherein the at least one light-leakage-proof electrode and the common electrode are configured such that when a fixed signal is input into the light-leakage-proof electrode, an electric field is formed between the light-leakage-proof electrode and the common electrode, wherein the electric field makes a long axis of liquid crystal molecules at a position corresponding to the light-leakage-proof electrode in the liquid crystal molecule layer to be perpendicular to the array substrate, so that a polarization state of light emitted from the light source passing through the lower polarizer will not be changed after passing through the liquid crystal molecules, so that the light cannot be emitted from the upper polarizer. wherein the array substrate comprises a plurality of pixel electrodes arranged in arrays on a base substrate, the array substrate further comprises a signal line (12, 121) located on a different layer from the plurality of pixel electrodes, a vertical projection of the signal line on the base substrate is located between vertical projections of two adjacent pixel electrodes of the plurality of pixel electrodes on the base substrate, the vertical projections of the two adjacent pixel electrodes and the vertical projection of the signal line have two gaps therebetween, wherein the array substrate further comprises at least one light-leakage-proof electrode arranged to be insulated from the pixel electrodes and the signal line, and a vertical projection of the light-leakage-proof electrode on the base substrate completely covers the two gaps between the vertical projections of the two adjacent pixel electrodes and the vertical projection of the signal line, and also completely covers the vertical projection of the signal line on the base substrate, the layer of the light-leakage-proof electrode is located on a side of the layer of the pixel electrodes away from the signal line, and the layer of the light-leakage-proof electrode and the layer of the pixel electrodes have a first insulation layer disposed therebetween, wherein the display device further comprises a lower polarizer on the array substrate and an upper polarizer on the color filter substrate, a transmission axis direction of the lower polarizer and a transmission axis direction of the upper polarizer are perpendicular to each other, wherein the color filter substrate comprises a common electrode, wherein the at least one light-leakage-proof electrode and the common electrode are configured such that when a fixed signal is input into the light-leakage-proof electrode, an electric field is formed between the light-leakage-proof electrode and the common electrode, wherein the electric field makes a long axis of liquid crystal molecules at a position corresponding to the light-leakage-proof electrode in the liquid crystal molecule layer to be perpendicular to the array substrate, so that a polarization state of light emitted from the light source passing through the lower polarizer will not be changed after passing through the liquid crystal molecules, so that the light cannot be emitted from the upper polarizer.