Display apparatus and power supplying method performed by display apparatus in different power modes
View Patent ↗A display apparatus and a power providing method performed by the display apparatus including a panel that operates in a normal mode or a low power display mode; a power supplying unit that outputs a first high voltage and a first low voltage to the panel in the normal mode, wherein the first high voltage and the first low voltage are first power voltages; and a driving integrated circuit that selectively receives a plurality of input voltages according to a display mode, and that outputs a second high voltage and a second low voltage to the panel in the low power display mode, wherein the second high voltage and the second low voltage are second power voltages.
1. A display apparatus, comprising:
a panel to operate in a normal mode and a low power display mode;
a power supplying source that outputs a first high voltage and a first low voltage to the panel in the normal mode, wherein the first high voltage and the first low voltage are first power voltages; and
a driving integrated circuit to select at least one input voltage from among a plurality of input voltages according to the display mode of the panel, and output a second high voltage and a second low voltage to the panel in the low power display mode, wherein the second high voltage and the second low voltage are second power voltages generated based on the selected at least one input voltage wherein the driving integrated circuit generates the second power voltages based on a panel power voltage and a logic voltage, wherein the driving integrated circuit comprises:
a mode determination unit that determines the display mode; and
a voltage conversion unit that generates a first driving voltage and a second driving voltage based on the panel power voltage in the normal mode, and that generates the second power voltages, a third driving voltage, and a fourth driving voltage based on the panel power voltage and the logic voltage in the low power display mode,
wherein the voltage conversion unit comprises:
a charge pump that boosts an input voltage and then outputs a positive voltage and a negative voltage that are a multiple of the input voltage; and
an amplifier that amplifies the positive voltage and the negative voltage output from the charge pump, and then generates the first driving voltage, the second driving voltage, the second power voltages, the third driving voltage, and the fourth driving voltage, and wherein the charge pump comprises:
a first booster that outputs a positive first output voltage boosted to a predetermined level by using panel power voltages input via a first input line and a second input line in the normal mode, and that outputs a positive first output voltage boosted to a predetermined level by using the panel power voltage input via the first input line, and a logic voltage input via the second input line in the low power display mode;
a second booster that outputs a positive second output voltage boosted to a predetermined level by using the positive first output voltages input via a first input line and a second input line in the normal mode, and that outputs a positive second output voltage boosted to a predetermined level by using the panel power voltage input via the first input line, and a logic voltage input via the second input line in the low power display mode; and
a third booster that outputs a negative third output voltage stepped down to a predetermined level by using the positive first output voltages input via a first input line and a second input line in the normal mode, and that outputs a negative third output voltage stepped down to a predetermined level by using the panel power voltage input via the first input line in the low power display mode.
2. The display apparatus as claimed in claim 1 , wherein the power supplying source is to generate the first power voltages based on a panel power voltage which corresponds to one of the input voltages into the driving integrated circuit.
3. The display apparatus as claimed in claim 1 , wherein a difference between the second high voltage and the second low voltage is less than a difference between the first high voltage and the first low voltage.
4. The display apparatus as claimed in claim 1 , wherein the driving integrated circuit further comprises a gamma corrector that receives a voltage as a gamma correction voltage, wherein the voltage is obtained by amplifying the first output voltage.
5. The display apparatus as claimed in claim 1 , further comprising:
a first switching device that is arranged between the power supplying source and the panel, and that cuts the first high voltage; and
a second switching device that is arranged between the power supplying source and the panel, and that cuts the first low voltage.