US 2015/0309550 A1Published application

Mobile terminal and display panel driver

AssigneeSynaptics Display Devices GK

InventorsMasaru SHIRAKAMI, Teru YONEYAMA

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Abstract

A power circuit section generates a first logic power supply voltage and an analog power supply voltage to supply to a first power supply line and a second power supply line, respectively. A regulator steps the first logic power supply voltage down to generate a second logic power supply voltage and supplies the second logic power supply voltage to a third power supply line. A logic circuit controls A source line driving section and A gate line driving section in response to a decrease of a voltage of the first power supply line so that the charge stored in the display panel is discharged. A charge transporting path is configured to transport the charge from the second power supply line to a third power supply line in response to the decrease of the voltage of the first power supply line.

Claims19

Dependent claims

A mobile terminal comprising:

a display panel provided with a source line and a gate line;
a power storage device;
a power circuit section configured to generate a first logic power supply voltage and an analog power supply voltage higher than said first logic power supply voltage, both the first logic power supply voltage and the analog power supply voltage generated from a power received from said power storage device, to provide said first logic power supply voltage to a first power supply line and to provide said analog power supply voltage to a second power supply line;
a gate line driving section configured to drive said gate line;
a source line driving section configured to drive said source line;
a first regulator provided with an input for receiving said first logic power supply voltage and configured to step said first logic power supply voltage down to generate a second logic power supply voltage, and provide said second logic power supply voltage to a third power supply line;
a logic circuit configured to receive said second logic power supply voltage from said third power supply line and control said gate line driving section and said source line driving section;
and
a charge transport path,
wherein said logic circuit is configured to control said gate line driving section and said source line driving section in response to a decrease of at least one of a voltage of said first power supply line and a voltage of said second power supply line, so as to discharge a charge stored in said display panel, and
wherein said charge transport path is configured to transport a charge from said second power supply line to said third power supply line in response to a decrease of voltage of said first power supply line.

8 more elements

A display panel driver configured to drive a display panel, said display panel driver comprising:

a first external power terminal configured to receive a first logic power supply voltage;
a second external power terminal configured to receive an analog power supply voltage;
a first power supply line connected to said first external power terminal;
a second power supply line connected to said second external power terminal;
a gate control driving circuit configured to generate a gate control signal adapted to control a gate driver that drives a gate line of said display panel or a gate drive signal adapted to drive said gate line;
a source line driving circuit configured to drive a source line of said display panel;
a first regulator provided with an input to receive said first logic power supply voltage and configured to step said first logic power supply voltage down to generate a second logic power supply voltage and provide said second logic power supply voltage to a third power supply line;
a logic circuit configured to receive said second logic power supply voltage from said third power supply line and control said source line driving circuit and said gate control driving circuit;
and
a charge transport path,
wherein said logic circuit is configured to control said source line driving circuit and said gate control driving circuit in response to a decrease of at least one of a voltage of said first external power terminal and a voltage of said second external power terminal, so as to discharge a charge stored in said display panel, and
wherein said charge transport path is configured to transport a charge from said second power supply line to said third power supply line in response to a decrease of voltage of said first external power terminal.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/692,851Filed 22 Apr 2015
Priority: JP 201408990824 Apr 2014
Published: 29 Oct 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G06F 1/30
Power supply means, e.g. regulation thereof: means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations
G09G 3/3696
Control of matrices with row and column drivers: generation of voltages supplied to electrode drivers
G09G 2330/02
Aspects of power supply; Aspects of display protection and defect management: details of power systems and of start or stop of display operation
G09G 2330/027
Details of power systems and of start or stop of display operation: arrangements or methods related to powering off a display