Circuit configuration and method for controlling particularly segmented LED background illumination

1. A circuit arrangement for controlling a first and a second segment of a segmented LED backlight for a display unit, the circuit arrangement comprising:

a first generator with an input adapted to be supplied with a synchronizing signal that comprises image frequency information of the display unit or an integer multiple thereof,

an additional input to be supplied with a first data signal that comprises image information of a first segment of a display of the display unit, wherein the first data signal comprises an image brightness information item and an image delay information item, the brightness information item and the image delay information item both being generated by means of a digital video processor for the first segment of the segmented LED backlight being controlled by the circuit arrangement,

an output for providing a first modulated signal for controlling the first segment of the segmented LED backlight, wherein the first generator is configured to provide the first modulated signal as a function of a modulation of the synchronizing signal with the first data signal such that the image frequency information is delayed by the image delay information item generated for the first segment and that a pulse-width of the first modulated signal is defined as a function of the image brightness information item generated for the first segment,

a second generator with an input adapted to be supplied with the synchronizing signal that comprises image frequency information of the display unit or an integer multiple thereof,

an additional input to be supplied with a second data signal—differing from the first data signal—that comprises image information of a second segment of the display of the display unit, wherein the second data signal comprises an image brightness information item and an image delay information item, the brightness information item and the image delay information item both being generated by, means of a digital video processor for the second segment of the segmented LED backlight being controlled by the circuit arrangement, and

an output for providing a second modulated signal for controlling the second segment of the segmented LED backlight, wherein

the second generator is configured to provide the second modulated signal as a function of a modulation of the synchronizing signal with the second data signal such that the image frequency information is delayed by the image delay information item generated for the second segment and that a pulse-width of the second modulated signal is defined as a function of the image brightness information item generated for the second segment.

2. The circuit arrangement according to claim 1 , wherein the synchronizing signal comprises image frequency information and line frequency information of the display unit.

3. The circuit arrangement according to claim 1 , wherein the input adapted to be supplied with the synchronizing signal of the first or second generator is coupled to a phase-locked loop.

4. The circuit arrangement according to claim 1 , wherein the first or second generator is configured so that the first or second modulated signal is clocked to the synchronizing signal.

5. The circuit arrangement according to claim 1 , wherein the first or second generator is configured to provide the first or second modulated signal as a function of a modulation of the synchronizing signal with the first or second data signal.

6. The circuit arrangement according to claim 1 , wherein the first or second data signal comprises at least an image brightness information item of the display.

7. The circuit arrangement according to claim 1 , wherein the first or second data signal further comprises a respective image delay information item for an LED backlight, controlled segment by segment, of the display.

8. The circuit arrangement according to claim 1 , wherein the first or second generator comprises a pulse-width modulator.

9. The circuit arrangement according to claim 1 , wherein the first or second generator comprises a sigma-delta modulator.

10. A display driving unit with a circuit arrangement according to claim 1 , comprising a driver with an input that is coupled to the output of the first generator, and to an output adapted to be connected to the first segment of the segmented LED backlight in particular.

11. A display driving unit according to claim 10 , comprising:

an additional one of said driver with an input to be supplied with the second modulated signal and an output adapted to be coupled to the second segment of the segmented LED backlight.

12. The display driving unit according to claim 11 , wherein the synchronizing signal comprises image frequency information and line frequency information of the display unit.

13. A display unit with a display driving unit according to claim 11 , wherein

the outputs of the digital video processor are coupled to associated inputs of the display driving unit, and wherein

each of the first and second segments is connected to the outputs of the display driving unit.

14. A method for generating modulated signals for controlling a first and second segment of a segmented LED backlight for a display unit, the method comprising:

supplying a synchronizing signal that comprises image frequency information of the display unit or an integer multiple thereof,

supplying a first data signal that has at least image information of the first segment of a display of the display unit, wherein the first data signal comprises an image brightness information item and an image delay information item, the brightness information item and the image delay information item both being generated by means of a digital video processor for the first segment of the segmented LED backlight being controlled by the circuit arrangement,

providing a first, modulated signal for controlling the first segment of the segmented LED backlight in such a way that the first modulated signal is modulated as a function of the synchronizing signal with the first data signal wherein the image frequency information is delayed by the image delay information item generated for the first segment and that a pulse-width of the first modulated signal is defined as a function of the image brightness information item generated for the first segment,

supplying a second data signal—differing from the first data signal—that has at least image information of the second segment of the display unit, wherein the second data signal comprises an image brightness information item and an image delay information item, the brightness information item and the image delay information item both being generated by means of a digital video processor for the second segment of the segmented LED backlight being controlled by the circuit arrangement, and

providing a second modulated signal for controlling the second segment of the segmented LED backlight in such a way that the second modulated signal is modulated as a function of the synchronizing signal with the second data signal wherein the image frequency information is delayed by the image delay information item generated for the second segment and that a pulse-width of the second modulated signal is defined as a function of the image brightness information item generated for the second segment.

15. The method according to claim 14 , wherein the synchronizing signal comprises image frequency information and line frequency information of the display unit.

16. The method according to claim 14 , wherein the synchronizing signal is supplied via a phase-locked loop.

17. The method according to claim 14 , wherein the first or second data signal further comprises image delay information for an LED backlight, controlled segment by segment, of the display.

18. The method according to claim 14 , wherein the step of providing the first or second modulated signal is performed by pulse-width modulation.

19. The method according to claim 14 , wherein the step of providing the first or second modulated signal is performed by sigma-delta modulation.

20. The method according to claim 14 , wherein the first modulated signal is supplied to at least the first segment of a segmented LED backlight.