(19)
(11) EP 3 217 764 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 2 (W2 A1)

(48) Corrigendum issued on:
25.04.2018 Bulletin 2018/17

(43) Date of publication:
13.09.2017 Bulletin 2017/37

(21) Application number: 16159637.4

(22) Date of filing: 10.03.2016
(51) International Patent Classification (IPC): 
H05B 33/08(2006.01)
 G09G 3/34(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA MD

(71) Applicant: ams AG
8141 Unterpremstätten (AT)

(72) Inventor:
  • Gamperl, David
    8230 Hartberg (AT)

(74) Representative: Epping - Hermann - Fischer 
Patentanwaltsgesellschaft mbH Schloßschmidstraße 5
80639 München
80639 München (DE)

   


(54) DRIVING CIRCUIT FOR A LIGHT-EMITTING DIODE BACKLIGHT AND METHOD FOR DRIVING THE SAME


(57) In one embodiment a driving circuit for an LED backlight with at least a first and a second segment (S1, S2) has a first terminal (11), a second terminal (12) for sensing a first signal (Sg1), a third terminal (13) for connecting to a first current generating unit (T1, CS1) for providing a first driving current (I1), a first current regulation circuit (PWM1) for controlling the first current generating unit (CS1, T1), a fourth terminal (22) for sensing a second signal (Sg2), a fifth terminal (23) for connecting to a second current generating unit (CS2, T2) for providing a second driving current (I2), a second current regulation circuit (PWM2) for controlling the second current generating unit (CS2, T2), and a control unit (CTL) which is prepared to adjust the supply voltage (Vled) and to adjust the first and/or second driving current (I1, I2) in dependence on the first and the second signal (Sg1, Sg2) by means of the first and/or the second current regulation circuits (PWM1, PWM2).