# US 8,571,605 B2 · Mobile terminal and method of reducing power consumption for a dual display system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,571,605 B2
- Document ID: US8571605B2
- Status: Granted
- Kind: B2
- Application number: 12/507,644
- Filed: 2009-07-22
- Published: 2010-02-25
- Granted: 2013-10-29
- Earliest claimed: 2008-08-22
- Assignees: LG Electronics Inc.
- Applicants: Jun Serk Park; Na Ri Lee; Kang Min Kim; Kyoung Joung Kim; Jung Eun Kim
- Inventors: Jun Serk Park; Na Ri Lee; Kang Min Kim; Kyoung Joung Kim; Jung Eun Kim
- Web page: https://patentgrep.com/patent/US8571605B2

## CPC

- G06F 1/3265: {Power saving in display device}
- G06F 1/1613: {for portable computers (cooling arrangements therefor G06F1/203; constructional details or arrangements for pocket calculators, electronic agendas or books G06F15/0216; constructional details of portable telephone sets: with several bodies H04M1/0202)}
- G06F 1/1643: {the display being associated to a digitizer, e.g. laptops that can be used as penpads (details related to the relative motion of the display enclosure with respect to the body enclosure, e.g. to move between laptop and tablet PC configuration G06F1/1615)}
- G06F 1/1647: {including at least an additional display (G06F1/1692 takes precedence)}
- G06F 1/3203: Power management, i.e. event-based initiation of a power-saving mode
- G06F 1/3287: by switching off individual functional units in the computer system
- H04W 52/027: {by controlling a display operation or backlight unit}
- H04M 1/72445: for supporting Internet browser applications
- H04M 2250/16: including more than one display unit
- Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management
- Y02D 30/70: in wireless communication networks
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A mobile terminal and method of reducing power consumption in the mobile terminal are provided. The method includes displaying an operation screen in the first display module, determining a remaining battery power of the mobile terminal, and disabling the first display module and displaying the operation screen in the second display module in response to determining that the remaining battery power is less than a reference battery power.

## Claims

### Claim 1

A method of reducing power consumption in a mobile terminal having a first display module and a second display module, the method comprising:
displaying content of a first web page in a color mode in the first display module;
determining a remaining battery power of the mobile terminal;
disabling the first display module and displaying content of a second web page in a black-and-white mode in the second display module in response to determining that the remaining battery power is less than a reference battery power, wherein the displayed content of the second web page is the same as at least some of the displayed content of the first web page and comprises text included in the first web page without an image included in the first web page;
displaying a message in the second display module in response to determining that the remaining battery power is less than the reference battery power, wherein the displayed message comprises a first indication that the second display module is used instead of the first display module;
maintaining the display of the content of the first web page in the first display module and displaying a result screen in a black-and-white mode in the second display module in response to determining that the remaining battery power exceeds the reference battery power, wherein the result screen is obtained via a search performed via the displayed first web page; and
performing functions of a double-sided display using the first and second display modules,
wherein:
the first display module is disposed on a front side of a main body of the mobile terminal;
the second display module is disposed on a rear side of the main body; and
the first and second display modules form a symmetrical structure and face opposite directions from each other.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first and second display modules each include a touch screen and an e-paper.

### Claim 3 (depends on 1)

The method of claim 1, wherein:
the front side faces frontwardly; and
the rear side faces rearwardly.

### Claim 4 (depends on 1)

The method of claim 1, wherein displaying the content of the second web page comprises displaying a selected portion of the content included in the first web page.

### Claim 5 (depends on 1)

The method of claim 1, further comprising setting the reference butte power according to a user input.

### Claim 6 (depends on 1)

The method of claim 1, wherein the displayed message further comprises a second indication that the remaining battery power is insufficient.

### Claim 7 (depends on 1)

The method of claim 1, further comprising entering a power-save mode by the mobile terminal when the first display module is disabled.

### Claim 8

A mobile terminal comprising:
a main body;
a first display module located on a front surface of the main body and a second display module located on a rear surface of the main body; and
a controller configured to:
enable a display of content of a first web page in a color mode in the first display module;
determine a remaining battery power of the mobile terminal;
disable the first display module and display content of a second web page in a black-and-white mode in the second display module in response to determining that the remaining battery power is less than a reference battery power, wherein the displayed content of the second web page is the same as at least some of the displayed content of the first web page, and wherein the displayed content of the second web page comprises text included in first web page without an image included in the first web page;
enable display of a message in the second display module in response to determining that the remaining battery power is less than the reference battery power, wherein the displayed message comprises an indication that the second display module is used instead of the first display module;
maintain the enabled display of the content of the first web page in the first display module and display a result screen in a black-and-white mode in the second display module in response to determining that the remaining battery power exceeds the reference battery power, wherein the result screen is obtained via a search performed via the first web page; and
perform functions of a double-sided display using the first and second display modules,
wherein:
the first display module is disposed on the front surface of a main body of the mobile terminal;
the second display module is disposed on the rear surface of the main body; and
the first and second display modules form a symmetrical structure and face opposite directions from each other.

### Claim 9 (depends on 8)

The mobile terminal of claim 8, wherein the first and second display modules each include a touch screen and an e-paper.

### Claim 10 (depends on 8)

The mobile terminal of claim 8, wherein the controller is further configured to cause the mobile terminal to enter a power-save mode after the first display module is disabled.

### Claim 11

A method of reducing power consumption in a mobile terminal comprising a main body, the method comprising:
performing functions of a double-sided display using a first display module located on a front surface of the main body and a second display module located on a rear surface of the main body, wherein the first display module and the second display module form a symmetrical structure and face opposite directions from each other;
displaying an operation screen in a color mode in the first display module;
determining that a remaining battery power of the mobile terminal is less than reference battery power;
disabling the first display module and entering a power-save mode;
displaying one or more menu items that can be executed in the power-save mode, wherein the one or more menu items are displayed in a black-and-white mode in the second display module;
displaying content of a second web page in the second display module, the displayed content comprising text included in a first web page without an image included in the first web page; and
displaying a message in the second display module in response to determining that the remaining battery power is less than the reference battery power, wherein the displayed message comprises an indication that the second display module is being used instead of the first display module.

### Claim 12 (depends on 11)

The method of claim 11, wherein the first and second display modules each include a touch screen and an e-paper.

### Claim 13 (depends on 11)

The method of claim 11, further comprising performing an operation corresponding to the displayed one or more menu items in response to an input received at the mobile terminal.

### Claim 14 (depends on 13)

The method of claim 13, further comprising displaying information in the second display module to indicate a period of time during which the operation can be performed according to the determined remaining battery power.

### Claim 15

A mobile terminal comprising:
a main body;
a first display module located on a front surface of the main body and a second display module located on a rear surface of the main body; and
a controller configured to:
perform functions of a double-sided display using the first and second display modules, wherein the first and second display modules form a symmetrical structure and face opposite directions from each other;
enable display of an operation screen in a color mode in the first display module;
determine that a remaining battery power of the mobile terminal is less than a reference battery power;
disable the first display module, cause the mobile terminal to enter a power-save mode, and enable display of one or more menu items that can be executed in the power-save mode, the one or more items displayed in a black-and-white mode in the second display module;
enable display of content of a second web page in the second display module, the displayed content comprising text included in the first web page without displaying an image included in the first web page;
enable display of a message in the second display module in response to determining that the remaining battery power is less than the reference battery power, wherein the displayed message comprises an indication that the second display module is being used instead of the first display module.

### Claim 16 (depends on 15)

The mobile terminal of claim 15, wherein the first and second display modules each include a touch screen and an e-paper.

### Claim 17 (depends on 15)

The mobile terminal of claim 15, wherein the controller is further configured to control an operation corresponding to the displayed one or more menu items in response to an input received by the mobile terminal.