US 9,541,981 B2 · Mobile terminal and display panel driver

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.

Drawings

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Drawings

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.

Description15,633 words

Summary1,157 words

#This application claims priority of Japanese Patent Application No. 2014-089908, filed on Apr. 24, 2014, the disclosure which is incorporated herein by reference.

#The present invention is related to a mobile terminal and a display panel driver. The present invention is related in particular to an optimization of operations of a display panel driver when a power supply from a power storage device (e.g. a battery) is stopped.

#Mobile terminals, such as a cell phone, a smart phone, a tablet terminal and others, are generally provided with a power storage device such as a battery, and each device mounted on a mobile terminal receives a power from the power storage device to operate.

Brief description of the drawings24 figures

#FIG. 1 is a block diagram showing an example of configuration of a mobile terminal.

#FIG. 2 is an exemplary diagram showing an example of operation of an LCD controller driver of the mobile terminal in FIG. 1.

#FIG. 3 is an exemplary an exemplary diagram showing an example of operation of a display panel driver in a case where an abnormal shutdown occurs due to a cutoff of a power supply from a power storage device such as a battery.

Detailed description13,920 words

#It will be described below, firstly for an easier comprehension of the technical significance of the present invention, about an exemplary configuration of a mobile terminal and an example of an operation of a display panel driver in a case where an abnormal shutdown occurs due to a cutoff of power supply from a power storage device (most typically, a battery).

#FIG. 1 is a block diagram showing an example of configuration of a mobile terminal (e.g. a cellular phone, a smart phone, a tablet device). The mobile terminal 1 in FIG. 1 includes a main board 2, a battery 3, a microphone 4, a speaker 5, an antenna module 6 and an LCD display panel 7. On the main board 2 are mounted an audio interface 11, a baseband/application processor 12, a DSP (Digital Signal Processor) 13, an ASIC (Application Specific Integrated Circuit) 14, a micro-computer 15, a high-frequency interface 16, a memory 17, a system PMIC (Power Management IC) 18 and an LCD controller driver 20. Herein, the LCD controller driver 20 is a display panel driver that drives the LCD display panel 7, and the display device is configured from a LCD display panel 7 and a LCD controller driver 20.

#Each of devices mounted on the main board 2 receives the supply of power from the battery 3 to operate. In particular, the system PMIC 18 generates a power supply voltage to be supplied to each device of the main board 2, from the power received from the battery 3. The system PMIC 18 also has a function to charge the battery 3 when the mobile terminal 1 is connected to an external power supply (e.g. a commercial AC (Alternative Current) power).

Facts

Application

14/692,851Filed 22 Apr 2015

Priority

JP 2014-08990824 Apr 2014

Published

US 2015/0309550 A129 Oct 2015

Granted

10 Jan 2017

Term ends

5 Aug 2035

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 105 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

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

Timeline

24 Apr 2014Priority claimedJP 2014-089908
22 Apr 2015Application filedUS 14/692,851
22 Apr 2015Assigned to Synaptics Display Devices Kkassignment of assignor's interest
29 May 2015Assigned to Synaptics Display Devices Gkchange of name
29 Oct 2015PublishedUS 2015/0309550 A1
8 Aug 2016Assigned to Synaptics Japan Gkchange of name
10 Jan 2017GrantedUS 9,541,981 B2
27 Sep 2017Assigned to Wells Fargo Bank, National Associationsecurity interest
20 Jun 2024Assigned to Synaptics Incorporatedassignment of assignor's interest
12 Oct 2026TodayWithin its term
5 Aug 2035Term endsEstimated, includes 105 days of adjustment

Mobile terminal and display panel driver

Life of this patent

Mobile terminal and display panel driver

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims19

Description15,633 words

Drawings

Classification7 codes

Life of this patent

Description15,633 words