DC/DC converter and liquid crystal display

A liquid crystal display comprising:

• an insulating substrate having a first area and a second area adjacent to the first area;
• a pixel array formed in the first area of the insulating substrate;
• a driver formed in the second area of the insulating substrate to drive the pixel array;
• and
• a DC/DC converter formed in the second area of the insulating substrate to supply a driving voltage to the driver,
• wherein the DC/DC converter comprises a charge pump comprising:
• a thin film transistor formed in the second area of the insulating substrate, having a first main electrode connected to an output terminal outputting an output voltage, and a control electrode receiving a control signal, and comprising a non-monocrystal semiconductor;
• a capacitor having a first electrode directly connected to a second main electrode of the thin film transistor and a second electrode receiving a variable voltage;
• and
• a first diode electrically connected between the second main electrode of the thin film transistor, the first electrode of the capacitor, and a power terminal in series, and comprising a mono-crystal semiconductor, and
• wherein the first main electrode is distinct from the second main electrode.

A liquid crystal display comprising:

• an insulating substrate including a first area and a second area adjacent to the first area;
• a pixel array formed in the first area of the insulating substrate;
• a driver driving the pixel array;
• a DC/DC converter formed in the second area of the insulating substrate
• to supply a driving voltage to the driver;
• and
• a flexible printed wiring substrate adjacent to the insulating substrate,
• wherein the DC/DC converter comprises a charge pump comprising:
• a thin film transistor formed in the second area of the insulating substrate, having a first main electrode connected to an output terminal outputting an output voltage, and a control electrode receiving a control signal, and comprising a non-monocrystal semiconductor;
• a capacitor having a first electrode directly connected to a second main electrode of the thin film transistor and a second electrode receiving a variable voltage;
• and
• a first diode disposed on the flexible printed wiring substrate, electrically connected between the second main electrode of the thin film transistor, the first electrode of the capacitor, and a power terminal in series, and comprising a mono-crystal semiconductor,
• wherein the first main electrode is distinct from the second main electrode.

A liquid crystal display comprising:

• an insulating substrate including a first area and a second area adjacent to the first area;
• a pixel array formed in the first area of the insulating substrate;
• a driver driving the pixel array;
• a DC/DC converter formed in the second area of the insulating substrate to supply a driving voltage to the driver;
• and
• a printed circuit board controlling the pixel array, the driver, and the DC/DC converter,
• wherein the DC/DC converter comprises a charge pump comprising:
• a thin film transistor formed in the second area of the insulating substrate, having a first main electrode connected to an output terminal outputting an output voltage, and a control electrode receiving a control signal, and comprising a non-monocrystal semiconductor;
• a capacitor having a first electrode directly connected to a second main electrode of the thin film transistor and a second electrode receiving a variable voltage;
• and
• a first diode disposed on the printed circuit board, electrically connected between the second main electrode of the thin film transistor, the first electrode of the capacitor, and a power terminal in series, and comprising a mono-crystal semiconductor, and
• wherein the first main electrode is distinct from the second main electrode.