Circuit arrangement and method for driving segmented LED backlights in particular
AssigneeAms AG
InventorManfred Pauritsch
Life of this patent
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Abstract
A circuit arrangement for controlling a segmented LED backlight in particular, comprises a generator (50) with a first input (10) to be supplied with a synchronizing signal (SYNC) that comprises image frequency information and/or line frequency information of a display unit, a second input (20) to be supplied with a data signal (DATA) that comprises image information of the display unit, and with an output (30) for providing a modulated signal (MOD).
Claims20
A circuit arrangement for controlling a segmented LED backlight for a display unit, having a generator with at least one input adapted to be supplied with one or more synchronizing signals comprising line frequency information and image frequency information of the display unit, an additional input to be supplied with a data signal that comprises an image delay information item and an image brightness information item of a respective segment of the segmented LED backlight, and with an output for providing a modulated signal for controlling the segmented LED backlight,
- wherein the generator is configured to provide the modulated signal as a function of the data signal such that the image frequency information is delayed by the image delay information item, a leading edge of the modulated signal is synchronized with the line frequency information and a pulse of the delayed image frequency information, and a trailing edge of the modulated signal is synchronized with the line frequency information and a pulse of the image frequency information.
A method for generating a modulated signal for controlling a segmented LED backlight for a display unit, the method comprising:
- supplying a synchronizing signal that comprises line frequency information and image frequency information of the display unit;
- supplying a data signal that has at least an image delay information item and an image brightness information item of a respective segment of the segmented LED backlight;
- and
- providing a modulated signal for controlling the segmented LED backlight such that the image frequency information is delayed by the image delay information item, a leading edge of the modulated signal is synchronized with the line frequency information and a pulse of the delayed image frequency information, and a trailing edge of the modulated signal is synchronized with the line frequency information and a pulse of the image frequency information.
A circuit arrangement for controlling a segmented LED backlight for a display unit, having a generator with at least one input adapted to be supplied with one or more synchronizing signals comprising line frequency information and image frequency information of the display unit, an additional input to be supplied with a data signal that comprises an image delay information item and an image brightness information item of a respective segment of the segmented LED backlight, and with an output for providing a modulated signal for controlling the segmented LED backlight,
- wherein the generator is configured to provide a delayed signal such that the image frequency information is delayed by the image delay information item and the delayed image frequency information is synchronized with the line frequency information, and
- wherein the generator is further configured to provide the modulated signal by combining the delayed image frequency information with the image brightness information item in a pulse-width modulation such that a leading edge of the modulated signal is synchronized with a pulse of the delayed image frequency information and a trailing edge of the modulated signal is synchronized with a pulse of the image frequency information.
A method for generating a modulated signal for controlling a segmented LED backlight for a display unit, the method comprising:
- supplying a synchronizing signal that comprises line frequency information and image frequency information of the display unit;
- supplying a data signal that has at least an image delay information item and an image brightness information item of a respective segment of the segmented LED backlight;
- providing a delayed signal such that the image frequency information is delayed by the image delay information item and the delayed image frequency information is synchronized with the line frequency information;
- and
- providing a modulated signal for controlling the segmented LED backlight by combining the delayed image frequency information with the image brightness information item in a pulse-width modulation such that a leading edge of the modulated signal is synchronized with a pulse of the delayed image frequency information and a trailing edge of the modulated signal is synchronized with the image frequency information.
A circuit arrangement for controlling a segmented LED backlight for a display unit, the circuit arrangement comprising:
- a generator comprising:
- at least one input adapted to be supplied with one or more synchronizing signals comprising line frequency information and image frequency information of the display unit;
- an additional input adapted to be supplied with a data signal comprising an image delay information item and an image brightness information item of a respective segment of the segmented LED backlight;
- and
- an output for providing a modulated signal for controlling the segmented LED backlight;
- wherein the generator is configured to:
- delay the image frequency information based on the image delay information item,
- generate a leading edge of a pulse of the modulated signal to allow the leading edge to be synchronized with the line frequency information and allow the leading edge to be synchronized with a pulse of the delayed image frequency information, and
- generate a trailing edge of the pulse of the modulated signal to allow the trailing edge to be synchronized with the line frequency information and to allow the trailing edge to be synchronized with a pulse of the image frequency information.
Dependencies are inferred from the claim text.