Scanning backlight for a matrix display

US7737937B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Nebojsa Fisekovic · Eindhoven, NL
• Jeroen Hubert Christoffel Jacobus Stessen · Eindhoven, NL
• Franciscus Johannes Stommels · Eindhoven, NL
• Carsten Deppe · Aachen, DE
• Ulrich Boeke · Eschweiler, DE
• Peter Luerkens · Aachen, DE

Key dates

• Filing date: May 9, 2005
• Grant date: Jun 15, 2010
• Expiry date: Oct 9, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G09G2360/145
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A scanning backlight unit (BU) for a matrix display comprises a plurality of light sources (L1, . . . , Ln). A driver (2) supplies drive signals (D1, . . . , Dn) to the light sources (L1, . . . , Ln). A controller (3) controls the driver (2) to separately activate the light sources (L1, . . . , Ln) to obtain light-emitting regions (5) being active. A light sensor (4) is associated with a group of at least two of the light sources (L1, . . . , Ln) to supply a sensor signal (SES) which indicates a luminance (LU) of the group. The controller (3) reads the sensor signal (SES) at different instants (ts1, . . . , tsn) at which mutually different subsets of the light sources (L1, . . . , Ln) of the group are active to control the driver (2) to supply power levels to the light sources (L1, . . . , Ln) of the group to obtain a luminance (LU1, . . . , LUn) of each one of the light sources (L1, . . . , Ln) of the group in dependence on the sensor signal (SES).