System of multiple timing controllers of a display panel
AssigneeNovatek Microelectronics Corp.
InventorsTzu-Chien Hsu, Yu-Lin Hsu
Life of this patent
Estimating the term…
Abstract
A timing controller of a display panel includes a spread spectrum clock generator (SSCG) and a control circuit block. The SSCG performs a spread spectrum operation on a clock signal to output a modulated clock signal having a varying frequency that varies with a fixed pattern, wherein a complete cycle of the frequency variation occurs in a frequency modulation period. The control circuit block outputs display data for the display panel within a data output period related to the modulated clock signal, and outputs a synchronization signal to another timing controller of the display panel, such that the another timing controller synchronizes a spread spectrum operation performed thereby with that performed by the SSCG.
Claims12
A timing controller of a display panel, comprising:
- a spread spectrum clock generator (SSCG) disposed to receive a clock signal, and configured to perform a spread spectrum operation on the clock signal based on a set of spreading factors, so as to output a modulated clock signal having a varying frequency that varies with a fixed pattern, wherein one complete cycle of the frequency variation of the modulated clock signal occurs in a frequency modulation period defined by the spreading factors;
- and
- a control circuit block coupled to said SSCG for receiving the modulated clock signal, and configured to output display data for the display panel within a data output period related to the modulated clock signal, and to output a synchronization signal to another timing controller of the display panel at a predefined time point in the frequency modulation period, such that the another timing controller synchronizes a spread spectrum operation performed thereby with that performed by said SSCG upon receiving the synchronization signal.
A method for synchronizing spread spectrum operations among multiple timing controllers of a display panel, comprising:
- by a timing controller of the display panel, performing a spread spectrum operation on a clock signal based on a set of spreading factors, and generating a modulated clock signal having a varying frequency that varies with a fixed pattern, wherein one complete cycle of the frequency variation of the modulated clock signal occurs in a frequency modulation period defined by the spreading factors;
- and
- by the timing controller, outputting display data for the display panel within a data output period related to the modulated clock signal, and outputting a synchronization signal to another timing controller of the display panel at a predefined time point in the frequency modulation period, such that the another timing controller synchronizes a spread spectrum operation performed thereby with that performed by the timing controller upon receiving the synchronization signal.
A system to manage output of display data for a display panel, comprising:
- a first timing controller that includes:
- a spread spectrum clock generator (SSCG) disposed to receive a first clock signal, and configured to perform a spread spectrum operation on the first clock signal based on a set of spreading factors, so as to output a modulated first clock signal having a varying frequency that varies with a fixed pattern, wherein one complete cycle of the frequency variation of the modulated first clock signal occurs in a frequency modulation period defined by the spreading factors;
- and
- a control circuit block coupled to said SSCG for receiving the modulated first clock signal, and configured to output display data for the display panel within a first data output period related to the modulated first clock signal, and to output a synchronization signal at a predefined time point in the frequency modulation period;
- and
- a second timing controller that includes:
- an SSCG disposed to receive a second clock signal, and configured to perform a spread spectrum operation on the second clock signal, so as to output a modulated second clock signal having a varying frequency that varies with a fixed pattern;
- and
- a control circuit block coupled to said SSCG of said second timing controller for receiving the modulated second clock signal, coupled to said control circuit block of said first timing controller for receiving the synchronization signal, and configured to output display data for the display panel within a second data output period related to the modulated second clock signal;
- wherein said control circuit block of said second timing controller is further configured to make said SSCG of said second timing controller synchronize the spread spectrum operation performed thereby with that performed by said SSCG of said first timing controller upon receiving the synchronization signal, so as to make the modulated second clock signal synchronized with the modulated first clock signal.
Dependencies are inferred from the claim text.