| 摘要 |
An active matrix liquid crystal display ( 1 ) comprises a display substrate ( 2 ) on which are formed a pixel matrix ( 3 ) and source and gate line drivers ( 4, 5 ) formed with polysilicon thin film transistors. A DC-DC converter ( 9 ) is also formed on the substrate ( 2 ) and converts an incoming supply voltage to a higher voltage needed to operate the transistors and the pixels formed on the substrate ( 2 ). The converter ( 9 ) comprises a voltage-boosting circuit ( 11 ) which is powered, at least during a start-up phase of operation of the display ( 1 ) by a photovoltaic cell ( 10 ) illuminated by a backlight ( 8 ) of the display ( 1 ). The cell ( 10 ) supplies sufficient power to the converter ( 9 ) so that it can convert the incoming supply voltage to the higher supply voltage required by the circuitry on the substrate ( 2 ). The output voltage of the circuit ( 11 ) may subsequently be used to power the circuit itself so that the backlight ( 8 ) may be switched off if it is not required for display purposes following the start-up operation.
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