Active matrix substrate including setting thin film transistor and resetting thin film transistor and display device including same

An active matrix substrate including a display region having a plurality of pixel regions and a peripheral region located in a periphery of the display region, the active matrix substrate comprising:

• a substrate;
• a plurality of gate bus lines and a plurality of source bus lines on the substrate;
• a source driver disposed in the peripheral region and including a plurality of output terminals;
• a plurality of signal output lines each connected to a corresponding one of the plurality of output terminals of the source driver;
• and
• a demultiplexer circuit which includes a plurality of unit circuits supported by the substrate and which is disposed in the peripheral region, wherein:
• each of the plurality of unit circuits of the demultiplexer circuit distributes a display signal from one signal output line of the plurality of signal output lines to n source bus lines of the plurality of source bus lines, where n is an integer larger than or equal to 2;
• each of the plurality of unit circuits includes
• n branch lines connected to the one signal output line, and
• n switching Thin Film Transistors (TFTs) each connected to a corresponding one of the n branch lines, the n switching TFTs being configured to perform individual on/off control of electrical connections of the n branch lines to the n source bus lines;
• the demultiplexer circuit further includes a plurality of boost circuits each configured to boost a voltage applied to a gate electrode of a corresponding one of the n switching TFTs;
• each of the plurality of boost circuits includes
• a set unit configured to pre-charge a first node connected to the gate electrode,
• a boost unit configured to boost a potential of the first node pre-charged by the set unit, and
• a reset unit configured to reset the potential of the first node;
• and
• each of the set unit and the reset unit includes a plurality of TFTs connected in series to each other.

An active matrix substrate including a display region having a plurality of pixel regions and a peripheral region located in a periphery of the display region, the active matrix substrate comprising:

• a substrate;
• a plurality of gate bus lines and a plurality of source bus lines on the substrate;
• a source driver disposed in the peripheral region and including a plurality of output terminals;
• a plurality of signal output lines each connected to a corresponding one of the plurality of output terminals of the source driver;
• and
• a demultiplexer circuit which includes a plurality of unit circuits supported by the substrate and which is disposed in the peripheral region, wherein:
• each of the plurality of unit circuits of the demultiplexer circuit distributes a display signal from one signal output line of the plurality of signal output lines to n source bus lines of the plurality of source bus lines, where n is an integer larger than or equal to 2;
• each of the plurality of unit circuits includes
• n branch lines connected to the one signal output line, and
• n switching Thin Film Transistors (TFTs) each connected to a corresponding one of the n branch lines, the n switching TFTs being configured to perform individual on/off control of electrical connections of the n branch lines to the n source bus lines;
• the demultiplexer circuit further includes a plurality of boost circuits each configured to boost a voltage applied to a gate electrode of a corresponding one of the n switching TFTs;
• and
• the demultiplexer circuit includes a plurality of clear circuits each connected to a corresponding one of the plurality of boost circuits and each configured to initialize the corresponding one of the plurality of boost circuits at a prescribed timing.