Low-power display control method and associated display controller
AssigneeMStar Semiconductor, Inc.
InventorsJen-Tang Chang, Yu-Chieh Hung, Hung-Yi Lin
Life of this patent
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Abstract
A low-power display control method and associated display controller is provided. The low-power display control method detects a sensing signal to generate a sensing result. A control signal is generated according to the sensing result to control a power conversion controller to operate in a low-power power saving mode. In response to a wake-up event, the control signal is deasserted and an associated auxiliary circuit is also turned off, and then the display controller is woken up to restore to a normal operating mode.
Claims18
A display controller, comprising:
- a voltage detecting circuit, configured for detecting a voltage level of a sensing signal associated with a voltage signal of a secondary side of a transformer, thereby powering the display controller in accordance with the sensing signal;
- a low-power control circuit, coupled to the voltage detecting circuit, configured for generating a first control signal according to the voltage level of the sensing signal;
- a power management unit, configured for receiving a wake-up event and generating a second control signal in response to the wake-up event;
- a microcontroller;
- a crystal input/output (I/O) circuit;
- and
- a selector, coupled to the low-power control circuit and the power management unit, configured for selectively outputting either the first control signal or the second control signal;
- wherein, when the selector outputs the second control signal, the power management unit deactivates the low-power control circuit, the microcontroller, and the crystal I/O circuit, and then reactivates the microcontroller and the crystal I/O circuit when either the voltage level of the sensing signal reaches a predetermined level or said display controller has charged for a predetermined period of time.
A low-power display control method, applied to a display controller, comprising:
- converting AC voltage received at a primary side of a transformer to a lower AC voltage at the secondary side of a transformer;
- detecting a sensing signal associated with a voltage signal of the secondary side of the transformer to generate a sensing result, thereby powering the display controller in accordance with the sensing signal;
- generating a control signal according to the sensing result to control a power conversion controller to control the display controller to operate in a low-power power saving mode by activating a low-power control circuit;
- deasserting the control signal and deactivating an associated auxiliary circuit in the display controller in response to a wake-up event, which deactivates the low-power control circuit, a microcontroller, and a crystal I/O circuit in the display controller;
- and
- waking-up the display controller to restore to a normal operating mode which reactivates the microcontroller and the crystal I/O circuit when either the voltage level of the sensing signal reaches a predetermined level or said display controller has charged for a predetermined period of time.
Dependencies are inferred from the claim text.