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Active matrix type display apparatus and drive circuit thereof

  • US 6,501,466 B1
  • Filed: 11/13/2000
  • Issued: 12/31/2002
  • Est. Priority Date: 11/18/1999
  • Status: Expired due to Fees
First Claim
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1. An active matrix type display apparatus comprising:

  • a scanning line drive circuit for sequentially selecting scanning lines;

    a data line drive circuit containing a current source for generating signal current having current level corresponding to an intensity information and for sequentially supplying thus generated signal current to “

    data lines”

    ; and

    a plurality of picture elements provided at each cross point of said “

    data line” and

    said scanning line and each of the picture elements having a current drive type light emitting device which emits light in response to drive current, wherein each of said picture element comprises;

    an accept section for accepting said signal current from the corresponding data line when a corresponding scanning line is selected;

    a converting section for converting a current level of thus accepted signal current once into corresponding voltage and restoring the converted voltage; and

    a drive section for supplying the drive current having a current level corresponding to the restored voltage to the corresponding light emitting device, said converting section includes;

    a conversion thin film transistor having a gate electrode, a source electrode, a drain electrode and a channel; and

    a capacitor connected to said gate electrode of the conversion thin film transistor, wherein said conversion thin film transistor generates at the gate electrode the voltage converted by flowing through said channel the signal current taken through said accept section and said capacitor holds the voltage generated at the gate electrode, said drive section contains;

    a drive thin film insulated gate type field effect transistor including a gate electrode, a drain electrode, a source electrode and a channel, wherein said drive thin film insulated gate type field effect transistor supplies the drive current through the channel to the light emitting device and the drive current has the current level corresponding to the voltage restored in said capacitor and accepted at the gate electrode of the drive thin film insulated gate type field effect transistor, and a threshold voltage of said drive thin film insulated gate type field effect transistor is set not to become lower than a threshold voltage of said conversion thin film insulated gate type field effect transistor corresponding to the picture element.

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