Display apparatus and power supply device for displaying

A display apparatus comprising:

• a display panel having a plurality of pixel parts arranged in a matrix, each pixel part including a pixel electrode connected to a data line and a scan line, and a common electrode opposed to the pixel electrode;
• a data driver for applying a gray scale voltage corresponding to display data to the pixel electrode of the pixel part, via the data line;
• a gate driver for applying a gate-on voltage and a gate-off voltage to the pixel electrode of the pixel part, via the scan line;
• and
• a power supply device for generating a reference voltage for the gray scale voltage, the gate-on voltage and the gate-off voltage, and a common voltage for the common electrode,
• wherein the power supply device includes a capacitor for holding an electric charge corresponding to the common voltage, and a selector for selecting between the charge of the capacitor and the discharge of the capacitor depending on a polarity of the pixel part.

A display apparatus comprising:

• a display panel having a plurality of pixel parts arranged in a matrix, each pixel part including a pixel electrode connected to a data line and a scan line, and a common electrode opposed to the pixel electrode;
• a data driver for applying a gray scale voltage corresponding to display data to the pixel electrode of the pixel part, via the data line;
• a gate driver for applying a gate voltage for scanning the pixel parts, to the pixel electrode of the pixel part, via the scan line;
• and
• a power supply device for generating a reference voltage for the gray scale voltage, the gate voltage, and a common voltage for the common electrode,
• wherein the power supply device includes a capacitor for holding an electric charge corresponding to the common voltage, and the gate voltage is generated from the common voltage held in the capacitor.

A display apparatus comprising:

• a display panel;
• a data driver for applying a gray scale voltage corresponding to display data to the display panel, via a data line;
• a gate driver for applying a gate-on voltage and a gate-off voltage to the display panel via a scan line;
• and
• a power supply device for generating a reference voltage for the gray scale voltage, the gate-on voltage and the gate-off voltage, and a common voltage for a common electrode,
• wherein the power supply device includes a holding circuit for holding an electric charge corresponding to the common voltage, and the gate-off voltage is generated from the electric charge held in the holding circuit.

A display apparatus comprising:

• a display panel;
• a data driver for applying a gray scale voltage corresponding to display data to the display panel, via a data line;
• a gate driver for applying a gate-on voltage and a gate-off voltage to the display panel, via a scan line;
• and
• a power supply device for generating a reference voltage for the gray scale voltage, the gate-on voltage and the gate-off voltage, and a common voltage for a common electrode,
• wherein the power supply device includes a capacitor for holding an electric charge corresponding to the common voltage, and a selector for selecting between the charge of the capacitor and the discharge of the capacitor depending on a polarity of the display panel.

A display apparatus comprising:

• a display panel;
• a data driver for applying a gray scale voltage corresponding to display data to the display panel, via a data line;
• a gate driver for applying a gate voltage, to the display panel, via a scan line;
• and
• a power supply device for generating a reference voltage for the gray scale voltage, the gate voltage, and a common voltage for a common electrode,
• wherein the power supply device includes a capacitor for holding an electric charge corresponding to the common voltage, and the gate voltage is generated from the common voltage held in the capacitor.