Patent · US Active

Active-matrix display, the emitters of which are supplied by voltage-controlled current generators

US7548222B2 · kind B2 · utility

1Cited by

2References

11Claims

0Family size

Assignee

Thomson Licensing · FR

Inventors

Philippe Le Roy · Singapore, SG
Christophe Prat · Couëron, FR
Pierrick Martin · Rennes, FR

Key dates

Filing date	Apr 13, 2006
Grant date	Jun 16, 2009
Priority date	—
Expiry date	Dec 9, 2027

Classification

Technology area (CPC G)Physics
CPC primaryG09G2300/0842
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The display comprises an array of pixel circuits each comprising an emitter 1 in series with a current modulation transistor, and at least one address circuit, which integrates, for each column, a differential amplifier and a passive element preferably a resistive element, which cooperate with the current modulation transistors so as to form, during address phases in which the emitters are switched “out of the circuit”, a voltage-programmable current generator. After the address phases, thanks to a suitable switch, the emitters are switched “into the circuit” and supplied with the preprogrammed current. Such a display allows the image display quality to be inexpensively improved.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.