Patent ID: 7791287

Claim:
A multiple-cell LED arrangement comprising: a plurality of cells ( 0 , 1 , 2 , 3 ) each including at least one respective LED having a binning class as a function of its emission wavelength (Li, L 2 ) and brightness (Bi, B 2 ) characteristics; a plurality of impedance elements (R 0 , R 1 , R 2 , R 3 ) respectively coupled with said cells ( 0 , 1 , 2 , 3 ), each said impedance element (R 0 , R 1 , R 2 , R 3 ) having an impedance value indicative of the binning class of said at least one LED included in the respective cell ( 0 , 1 , 2 , 3 ); and a controller ( 5 ) configured for sensing ( 6 , 80 , 81 , 82 , 83 ) the impedance values of said impedance elements (R 0 , R 1 , R 2 , R 3 ) and adaptively drive each said cell ( 0 , 1 , 2 , 3 ) as a function of its binning class as indicated by the impedance element (R 0 , R 1 , R 2 , R 3 ) coupled to the cell.