US 6,384,804 B1 · Display comprising organic smart pixels

Abstract

A display apparatus according to our invention comprises a multiplicity of nominally identical smart pixels, a given pixel comprising an organic light emitting diode and an organic or inorganic (e.g., amorphous or polycrystalline Si) pixel FET. The display also comprises drive/compensation circuitry adapted for mitigating or eliminating non-idealities associated with the organic components. Among the non-idealities are variations in mobility and/or threshold voltage of the pixel FET from transistor to transistor, change in mobility and/or threshold voltage with time in a given pixel FET, change over time of the LED characteristics, capacitive signal feed-through through the gate insulator of the pixel FETs by short rise/fall time pulses, poor on-off ratio of the pixel FET, and charge leakage through the gate dielectric. Exemplary drive/compensation circuitry is disclosed.

Claims16

Dependent claims

Display apparatus comprising:

a first substrate region having a multiplicity of nominally identical smart pixels;
and
a smart pixel-free second substrate region;
and
wherein each smart pixel comprises:
a) an organic light emitting diode;
and
b) pixel circuitry for providing a current through the organic light emitting diode, the pixel circuitry comprising at least one field effect transistor connected in series with the organic light emitting diode;
characterized in that
c) the field effect transistors are organic transistors;
and
d) the display apparatus comprises drive/compensation circuitry that mitigates one of transistor gate capacitive signal feed-through and transistor gate leakage currents that produce adverse effects on said smart pixels, a portion of said drive/compensation circuitry being disposed in said second substrate region.

9 more elements

Dependencies are inferred from the claim text.

Display comprising organic smart pixels

Life of this patent

Display comprising organic smart pixels

Life of this patent

Abstract

Claims16