Driving circuit and display device of using same

A driving circuit for driving a display device having a display panel, comprising:

• (a) a printed circuit board (PCB);
• (b) a transmitter disposed on the PCB for providing an input signal comprising a first Gamma reference voltage;
• (c) first and second transmission lines disposed on the PCB and electrically coupled to the transmitter for transmitting the input signal;
• wherein the first Gamma reference voltage is transmitted through the first transmission line;
• and
• (d) a plurality of source drivers formed in a chip-on-film (COF) architecture between the PCB and the display panel, wherein each source driver comprises:
• first and second Hi-z components electrically coupled to the first and second transmission lines, respectively, for preventing voltage drops of the input signal, and outputting the first and second Gamma reference voltages.

A method for driving a display device having a plurality of source drivers formed in a chip-on-film (COF) architecture, comprising the steps of:

• (a) generating first and second reference Gamma voltages of high-potential and low-potential supply, VHigh and VLow, wherein VHigh and VLow are corresponding to a highest gray-scale voltage and a lowest gray-scale supply voltage, respectively;
• (b) transmitting the Gamma voltages through first and second transmission lines by the power-line communication technology to the plurality of source drivers;
• (c) maintaining the potential levels of the Gamma voltages by operational-amplifiers (OP) embedded in each source driver so as to prevent Gamma voltage drops;
• (d) selecting Gamma voltages provided by a plurality of resistors connected in series between a highest gray-scale voltage and a lowest gray-scale supply voltage;
• and
• (e) removing Gamma amp offset voltages by Gamma switches of each source driver.