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Low-power driven display device

  • US 20040113903A1
  • Filed: 08/27/2003
  • Published: 06/17/2004
  • Est. Priority Date: 12/11/2002
  • Status: Active Grant
First Claim
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1. A display device comprising a power supply unit for supplying power, a display unit for displaying an image, a data input circuit for inputting display data corresponding to an image to be displayed on the display unit and a control circuit, wherein:

  • said power supply unit includes a power supply which varies a power supply ability with time, switches a plurality of different power supply abilities or has average produced power lower than average power required to rewrite one screen, a power storage unit which has a capacity of stored electric power for holding power higher than the average power required to rewrite one screen and a stored power detecting circuit which detects an amount of electric power stored in said power storage unit;

    said power supply is connected to said display unit via said power storage unit;

    said display unit includes a matrix display area, in which a large number of pixels having an optical modulating function capable of changing brightness, a reflectance, a transmittance and colors by a voltage or a current are arranged in a matrix, and a driving circuit including a sequence circuit for driving the matrix display area;

    an input of said data input circuit is connected to a data input terminal, and an output is connected to said driving circuit of the display unit;

    said pixels have a pixel memory for holding display data and are driven according to a pixel rewrite period for rewriting a display content of said display unit and a pixel holding period for holding the display content; and

    said control circuit controls said driving circuit to rewrite said display content of said display unit in response to output of a stored power detection signal indicative of a detected amount of stored electric power not less than the average power required for at least rewriting of an image screen from said stored power detecting circuit to rewrite the screen of said display unit.

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