Display driving circuit having half VDD power supply circuit built therein and display driving system including the same

A display driving system comprising:

• a display panel;
• a plurality of display driving circuits for driving the display panel;
• and
• a printed circuit board, on which a power supply circuit for supplying power to the display driving circuit is formed,
• wherein the display driving circuit includes:
• a first buffer, which includes a terminal of a first voltage VDD, having a highest voltage, a terminal of a second voltage VSS, having a lowest voltage, and a terminal of a half voltage H-VDD, which is driven within a range between the first voltage VDD and the half voltage H-VDD;
• a second buffer, which includes the terminal of the first voltage VDD, the terminal of the second voltage VSS and the terminal of the half voltage H-VDD for driving within a range between the half voltage H-VDD and the second voltage VSS;
• and
• a half voltage power supply circuit, which supplies the half voltage power to the first buffer and the second buffer, wherein:
• the first voltage VDD and the second voltage VSS are supplied from a power supply circuit on an outside of the display driving circuit, and the half voltage H-VDD is supplied from the half voltage power supply circuit on an inside of the display driving circuit, and
• respective output of the half voltage power supply circuits provided on the plurality of display driving circuits are connected to one another via a common line formed on the printed circuit board.