A display device comprising a display panel having a plurality of red pixels, a plurality of green pixels and a plurality of blue pixels and a test circuit for the display panel, the test circuit comprising: one or more shorting bars, a plurality of signal lines, and a switch circuit connected with the shorting bars and the signal lines; the switch circuit being configured to establish a connection between the signal lines and the corresponding shorting bar when the display panel is tested; and the switch circuit being configured to cut off the connection between the signal lines and the corresponding shorting bar when the display panel is not tested; the switch circuit comprising a control signal line and a plurality of switch transistors, each of the switch transistors comprising a control end coupled to the control signal line, an output end coupled to the corresponding shorting bar, and an input end coupled to multiple ones of the signal lines corresponding to the shorting bar; wherein the switch transistors are configured to be turned off to cut off the connection between the signal lines and the corresponding shorting bar in response to a first control signal transmitted by the control signal line; wherein the switch transistors are configured to be turned on to establish the connection between the plurality of signal lines and the corresponding shorting bar in response to a second control signal transmitted by the control signal line; wherein the plurality of signal lines comprise red pixel signal lines connected to the plurality of red pixels, green pixel signal lines connected to the plurality of green pixels and blue pixel signal lines connected to the plurality of blue pixels, the plurality of switch transistors comprise a first switch transistor, a second switch transistor, and a third switch transistor, and the shorting bars comprise a first shorting bar, a second shorting bar, and a third shorting bar; an input end of the first switch transistor is coupled to the red pixel signal lines, and an output end of the first switch transistor is coupled to the first shorting bar; an input end of the second switch transistor is coupled to the green pixel signal lines, and an output end of the second switch transistor is coupled to the second shorting bar; an input end of the third switch transistor is coupled to the blue pixel signal lines, and an output end of the third switch transistor is coupled to the third shorting bar. one or more shorting bars, a plurality of signal lines, and a switch circuit connected with the shorting bars and the signal lines; the switch circuit being configured to establish a connection between the signal lines and the corresponding shorting bar when the display panel is tested; and the switch circuit being configured to cut off the connection between the signal lines and the corresponding shorting bar when the display panel is not tested; the switch circuit comprising a control signal line and a plurality of switch transistors, each of the switch transistors comprising a control end coupled to the control signal line, an output end coupled to the corresponding shorting bar, and an input end coupled to multiple ones of the signal lines corresponding to the shorting bar; wherein the switch transistors are configured to be turned off to cut off the connection between the signal lines and the corresponding shorting bar in response to a first control signal transmitted by the control signal line; wherein the switch transistors are configured to be turned on to establish the connection between the plurality of signal lines and the corresponding shorting bar in response to a second control signal transmitted by the control signal line; wherein the plurality of signal lines comprise red pixel signal lines connected to the plurality of red pixels, green pixel signal lines connected to the plurality of green pixels and blue pixel signal lines connected to the plurality of blue pixels, the plurality of switch transistors comprise a first switch transistor, a second switch transistor, and a third switch transistor, and the shorting bars comprise a first shorting bar, a second shorting bar, and a third shorting bar; an input end of the first switch transistor is coupled to the red pixel signal lines, and an output end of the first switch transistor is coupled to the first shorting bar; an input end of the second switch transistor is coupled to the green pixel signal lines, and an output end of the second switch transistor is coupled to the second shorting bar; an input end of the third switch transistor is coupled to the blue pixel signal lines, and an output end of the third switch transistor is coupled to the third shorting bar.