Patent ID: 7196695
Filing Date: 2007-03-27
Classification: G02F,G06F

Abstract:
1. A backlight unit for a flat panel display (FPD) having a plurality of thin film transistors comprising: a lightguide, providing light propagating paths; a lamp, disposed beside said lightguide to emit lights into said lightguide in an edgelight form, said lights emitted into said lightguide propagate therethrough in a total reflection form; optical films, disposed on said lightguide for scattering lights emitted from said lightguide uniformly; a sensor board, attached to a lower surface of said lightguide, comprising an antenna array layer and a reflector surface layer, wherein said antenna array layer is applied to receive inputting signals from a hand-held stylus, and said reflector surface layer is applied to reflect lights dispersed from said lower surface of said lightguide; a control circuit board, attached beneath said sensor board, connected electrically for driving said thin film transistors via a flexible printed circuit board, and connected to said sensor board via a connecting bus for decoding said signals received by said sensor board; and an integrated control chip fabricated on said control circuit board to provide timing control signals for driving said thin film transistors and executing a logical function of decoding signals from said sensor board.