Patent · US Active

Adaptive noise reduction for digital display panels

US7742109B2 · kind B2 · utility

1Cited by

12References

10Claims

0Family size

Assignee

Thomson Licensing · FR

Inventors

Sebastien Weitbruch · Kirchberg, DE
Rainer Zwing · Villingen-Schwenningen, DE
Carlos Correa · Villingen-Schwenningen, DE

Key dates

Filing date	Aug 5, 2003
Grant date	Jun 22, 2010
Priority date	—
Expiry date	Sep 25, 2026

Classification

Technology area (CPC G)Physics
CPC primaryG09G2320/0276
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A plasma display panel is a pure linear display and does not provide a non-linear gamma behavior like a CRT so that an artificial gamma function has to be applied to the signal in digital form. This gamma function increases the quantization steps in the dark areas whereas the quantization steps will be reduced in the luminous areas. The basic idea is to apply an adaptive noise filtering after the gammatization process. The adaptive filtering is a specific filtering which is adapted to the gammatization quantization noise. In other words, the filtering will be maximum for dark areas and its efficacy will be automatically decreased when the luminance of the area is increasing.

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