Timing controller board, main control board, display device, and detection method thereof

A main control board, comprising a plurality of second connection pins which are correspondingly connected to first connection pins of a timing controller board through a flexible flat cable, and further comprising:

• a switching circuit;
• wherein
• the plurality of second connection pins comprise a second data signal pin, a clock signal pin, and a second fixed potential signal pin, and the switching circuit is electrically connected to the second data signal pin, the clock signal pin, and the second fixed potential signal pin respectively;
• the switching circuit comprises an input end connected to an output end of a detection circuit in the timing controller board through the flexible flat cable;
• and
• the switching circuit is configured to, when the input end receives a second level signal output by the timing controller board, load a second level signal transmitted by the second fixed potential signal pin to the second data signal pin and the clock signal pin to cause the main control board to stop outputting a signal to the timing controller board;
• wherein the switching circuit comprises:
• a JK trigger and a third triode;
• an end J of the JK trigger serves as the input end of the switching circuit, an end K of the JK trigger is grounded, an end Q of the JK trigger is electrically connected to a base of the third triode, and an end SD of the JK trigger is electrically connected to the second fixed potential signal pin;
• and
• a first electrode of the third triode is electrically connected to the second fixed potential signal pin, and a second electrode of the third triode is electrically connected to the second data signal pin and the clock signal pin respectively.

A display device, comprising a timing controller board and a main control board, first connection pins of the timing controller board being correspondingly connected to second connection pins of the main control board through a flexible flat cable;

• wherein
• the timing controller board comprises a detection circuit;
• the plurality of first connection pins comprise a first data signal pin and a first fixed potential signal pin, and the detection circuit is electrically connected to the first data signal pin and the first fixed potential signal pin respectively;
• the detection circuit comprises an output end connected to an input end of a switching circuit in the main control board through the flexible flat cable;
• the detection circuit is configured to, when the first data signal pin outputs a first level signal, output a second level signal transmitted by the first fixed potential signal pin to cause the main control board to stop outputting a signal to the timing controller board;
• and
• the main control board comprises a switching circuit;
• the plurality of second connection pins comprise a second data signal pin, a clock signal pin, and a second fixed potential signal pin, and the switching circuit is electrically connected to the second data signal pin, the clock signal pin, and the second fixed potential signal pin respectively;
• the switching circuit comprises an input end connected to the output end of the detection circuit in the timing controller board through the flexible flat cable;
• the switching circuit is configured to, when the input end receives a second level signal output by the timing controller board, load a second level signal transmitted by the second fixed potential signal pin to the second data signal pin and the clock signal pin to cause the main control board to stop outputting the signal to the timing controller board;
• wherein the detection circuit comprises:
• a first light emitting diode, a photoelectric triode, a first triode, and a second triode;
• a positive electrode of the first light emitting diode is electrically connected to the first fixed potential signal pin, and a negative electrode of the first light emitting diode is electrically connected to the first data signal pin;
• the first light emitting diode is turned on to emit light when the first data signal pin outputs the first level signal;
• a first electrode of the photoelectric triode is electrically connected to the first fixed potential signal pin, and a second electrode of the photoelectric triode is electrically connected to a base of the first triode;
• the photoelectric triode transmits a signal from the first electrode to the second electrode under illumination by the light emitted from the first light emitting diode;
• a first electrode of the first triode is electrically connected to the first fixed potential signal pin, and a second electrode of the first triode is grounded;
• a base of the second triode is electrically connected to the first electrode of the first triode, a first electrode of the second triode is electrically connected to the first fixed potential signal pin, and a second electrode of the second triode is grounded;
• and
• the output end of the detection circuit is connected to the first electrode of the second triode.