Abstract:
A method, and device incorporating the method, permits adjustment of the on time of a light source that illuminates a display within a handheld wireless communications device. The on time may be adjusted by the amount of information to be displayed, the font size of the information, the behavioral characteristics of the end user, the type of viewing activity, and the like. An optional dim mode permits the end user to be made aware that the light illuminating the display is about to be shut off.

Description:
FIELD OF THE INVENTION 
   The present invention relates to the field of wireless communications devices and, especially, to wireless communications devices having an electronic display of information. 
   BACKGROUND OF THE INVENTION 
   Wireless communications device users in a business environment need to have information comfortably and reliably. A major determiner of the effectiveness of a wireless communications device is the weight of the battery powering the device. Much research has occurred to try to optimize battery performance. There are three major techniques used to optimize battery performance: reducing the weight of the battery, increasing the energy density of the battery, and using less energy per unit time from the battery. 
   Lighting, data processing, alarm operation, and wireless transmission are all power consuming activities. Current techniques use a dumb timer to determine the amount of time power is applied to the light for a display. These techniques have been inadequate in many cases, such as when there is a great amount of text to read or when the material displayed requires careful reading. In these cases, the viewer needs to exercise a key board or thumb wheel to keep the light from turning off before the viewer is finished viewing the display screen. In other cases, where the material is quickly understood by the viewing, energy is wasted while the display remains lit beyond the point of usefulness. 
   Thus, there is a need for a lighting method for a display that optimizes the use of power and optimizes the understanding of the displayed information by a user of the wireless communications device. 
   SUMMARY OF THE INVENTION 
   The present invention relates to a method and device that optimizes the amount of time a display is lit. 
   In the present invention, the device firmware determines the amount of information on the display screen and then sets the light inactivity timer to be proportional to the amount of determined information. One or more factors are taken into consideration by a processing algorithm in the wireless communications device. Chief amongst the factors is the amount of information displayed within the view screen. The duration of power being applied to the light for the display may be established through the amount of information to be displayed. Other factors that may be used to establish the time of duration are the font size of the characters to be displayed, the type of activity, and the amount of ambient light. Examples of types of activity include e-mail composition, browser use, calendar use, phone usage, e-mail reading, task lists, and e-mail message searches. 
   Additional aspects and features of the invention will be apparent to those skilled in the art and include a computer program product having a computer readable medium tangibly embodying computer executable code for composing a destination for an outgoing communication generated by a wireless communications device for use in a wireless network. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Embodiments of present invention will now be described by way of example with reference to attached figures, wherein: 
       FIG. 1  is a block diagram that illustrates pertinent components of a wireless communications device that communicates within a wireless communication network according to the present invention; 
       FIG. 2  is a more detailed diagram of a preferred wireless communications device of  FIG. 1  according to the present invention; 
       FIG. 3  illustrates an embodiment of a backlit liquid crystal display; 
       FIG. 4  illustrates a first embodiment of the method of the present invention; 
       FIG. 5  illustrates a second embodiment of the method of the present invention; 
       FIG. 6  illustrates an embodiment of a light source timer-setting menu; 
       FIG. 7  illustrates a submenu of the menu of  FIG. 6  for setting the time out value; 
       FIG. 8  illustrates a submenu of the menu of  FIG. 6  for setting a dim mode; 
       FIG. 9  illustrates an embodiment of a user profile; and 
       FIG. 10  illustrates an embodiment of the general method of the present invention. 
   

   DETAILED DESCRIPTION 
   The present invention relates to a method, and wireless communications device that incorporates this method, for optimizing the time a display is in a lit state. The present invention offers a light power technique that is adaptive to a setting. Generally, in the present invention, the greater the amount of information on a display, the longer the time the display screen of the wireless communications device will be lit to permit a user to read a screen of information. Also, in the present invention, display lighting times will be increased when smaller font characters are to be displayed if the amount of information increases. In an embodiment of the present invention, a lighting timing learning mode may be implemented to accommodate users with varying reading capabilities. 
   A user interface for wireless communications device includes a component to compose a destination for an outgoing communication generated by the device. The component provides alternative composition means comprising a prompt for receiving the destination from a user; and a hot list of candidate destinations from which the user may select the destination. The component may be invoked directly from a home screen of the user interface by keying the destination. Entry from the main screen may populate the prompt with the keyed destination to speed calling operations. 
     FIG. 1  is a block diagram of a communication system  100  that includes a mobile station  102  that communicates through a wireless communication network symbolized by station  104 . Mobile station  102  preferably includes a visual display  112 , a keyboard  114 , and perhaps one or more auxiliary user interfaces (UI)  116 , each of which is coupled to a controller  106 . Controller  106  is also coupled to radio frequency (RF) transceiver circuitry  108  and an antenna  110 . 
   Typically, controller  106  is embodied as a central processing unit (CPU) that runs operating system software in a memory component (not shown). Controller  106  will normally control overall operation of mobile station  102 , whereas signal-processing operations associated with communication functions are typically performed in RF transceiver circuitry  108 . Controller  106  interfaces with device display  112  to display received information, stored information, user inputs, and the like. Keyboard  114 , which may be a telephone type keypad or full alphanumeric keyboard, is normally provided for entering data for storage in mobile station  102 , information for transmission to network  104 , a telephone number to place a telephone call, commands to be executed on mobile station  102 , and possibly other or different user inputs. 
   Mobile station  102  sends communication signals to and receives communication signals from the wireless network  104  over a wireless link via antenna  110 . RF transceiver circuitry  108  performs functions similar to those of a base station and a base station controller (BSC) (not shown), including for example modulation/demodulation and possibly encoding/decoding and encryption/decryption. It is also contemplated that RF transceiver circuitry  108  may perform certain functions in addition to those performed by a BSC. It will be apparent to those skilled in art that RF transceiver circuitry  108  will be adapted to particular wireless network or networks in which mobile station  102  is intended to operate. 
   Mobile station  102  includes a battery interface (IF)  134  for receiving one or more rechargeable batteries  132 . Battery  132  provides electrical power to electrical circuitry in mobile station  102 , and battery IF  132  provides for a mechanical and electrical connection for battery  132 . Battery IF  132  is coupled to a regulator  136  that regulates power to the device. When mobile station  102  is fully operational, an RF transmitter of RF transceiver circuitry  108  is typically keyed or turned on only when it is sending to network, and is otherwise turned off to conserve resources. Similarly, an RF receiver of RF transceiver circuitry  108  is typically periodically turned off to conserve power until it is needed to receive signals or information (if at all) during designated time periods. 
   Mobile station  102  operates using a Subscriber Identity Module (SIM)  140  which is connected to or inserted in mobile station  102  at a SIM interface (IF)  142 . SIM  140  is one type of a conventional “smart card” used to identify an end user (or subscriber) of mobile station  102  and to personalize the device, among other things. Without SIM  140 , the mobile station terminal is not fully operational for communication through the wireless network. By inserting SIM  140  into mobile station  102 , an end user can have access to any and all of his/her subscribed services. SIM  140  generally includes a processor and memory for storing information. Since SIM  140  is coupled to SIM IF  142 , it is coupled to controller  106  through communication lines  144 . In order to identify the subscriber, SIM  140  contains some user parameters such as an International Mobile Subscriber Identity (INISI). An advantage of using SIM  140  is that end users are not necessarily bound by any single physical mobile station. SIM  140  may store additional user information for the mobile station as well, including date book (or calendar) information and recent call information. 
   Mobile station  102  may consist of a single unit, such as a data communication device, a multiple-function communication device with data and voice communication capabilities, a personal digital assistant (PDA) enabled for wireless communication, or a computer incorporating an internal modem. Alternatively, mobile station  102  may be a multiple-module unit comprising a plurality of separate components, including but in no way limited to a computer or other device connected to a wireless modem. In particular, for example, in the mobile station block diagram of  FIG. 1 , RF transceiver circuitry  108  and antenna  110  may be implemented as a radio modem unit that may be inserted into a port on a laptop computer. In this case, the laptop computer would include display  112 , keyboard  114 , one or more auxiliary UIs  116 , and controller  106  embodied as the computer&#39;s CPU. It is also contemplated that a computer or other equipment not normally capable of wireless communication may be adapted to connect to and effectively assume control of RF transceiver circuitry  108  and antenna  110  of a single-unit device such as one of those described above. Such a mobile station  102  may have a more particular implementation as described later in relation to mobile station  202  of  FIG. 2 . 
     FIG. 2  is a detailed block diagram of a preferred mobile station  202 . Mobile station  202  is preferably a two-way wireless communication device having at least voice and advanced data communication capabilities, including the capability to communicate with other computer systems. Depending on the functionality provided by mobile station  202 , it may be referred to as a data messaging device, a two-way pager, a cellular telephone with data messaging capabilities, a wireless Internet appliance, or a data communication device (with or without telephony capabilities). Mobile station  202  may communicate with any one of a plurality of fixed transceiver stations  200  within its geographic coverage area. 
   Mobile station  202  will normally incorporate a communication subsystem  211 , which includes a receiver, a transmitter, and associated components, such as one or more (preferably embedded or internal) antenna elements and, local oscillators (LOs), and a processing module such as a digital signal processor (DSP) (all not shown). Communication subsystem  211  is analogous to RF transceiver circuitry  108  and antenna  110  shown in  FIG. 1 . As will be apparent to those skilled in field of communications, particular design of communication subsystem  211  depends on the communication network in which mobile station  202  is intended to operate. 
   Network access is associated with a subscriber or user of mobile station  202  and therefore mobile station  202  requires a Subscriber Identity Module or “SIM” card  262  to be inserted in a SIM IF  264  in order to operate in the network. SIM  262  includes those features described in relation to  FIG. 1 . Mobile station  202  is a battery-powered device so it also includes a battery IF  254  for receiving one or more rechargeable batteries  256 . Such a battery  256  provides electrical power to most if not all electrical circuitry in mobile station  202 , and battery IF  254  provides for a mechanical and electrical connection for it. The battery IF  254  is coupled to a regulator (not shown) that provides power V+ to all of the circuitry. 
   Mobile station  202  includes a microprocessor  238  (which is one implementation of controller  106  of  FIG. 1 ) that controls overall operation of mobile station  202 . Communication functions, including at least data and voice communications, are performed through communication subsystem  211 . Microprocessor  238  also interacts with additional device subsystems such as a display  222 , a flash memory  224 , a random access memory (RAM)  226 , auxiliary input/output (I/O) subsystems  228 , a serial port  230 , a keyboard  232 , a speaker  234 , a microphone  236 , a short-range communications subsystem  240 , and any other device subsystems generally designated at  242 . Some of the subsystems shown in  FIG. 2  perform communication-related functions, whereas other subsystems may provide “resident” or on-device functions. Notably, some subsystems, such as keyboard  232  and display  222 , for example, may be used for both communication-related functions, such as entering a text message for transmission over a communication network, and device-resident functions such as a calculator or task list. Operating system software used by microprocessor  238  is preferably stored in a persistent store such as flash memory  224 , which may alternatively be a read-only memory (ROM) or similar storage element (not shown). Those skilled in the art will appreciate that the operating system, specific device applications, or parts thereof, may be temporarily loaded into a volatile store such as RAM  226 . 
   Microprocessor  238 , in addition to its operating system functions, preferably enables execution of software applications on mobile station  202 . A predetermined set of applications that control basic device operations, including at least data and voice communication applications, will normally be installed on mobile station  202  during its manufacture. A preferred application that may be loaded onto mobile station  202  may be a personal information manager (PIM) application having the ability to organize and manage data items relating to the user such as, but not limited to, instant messaging (IM), e-mail, calendar events, voice mails, appointments, and task items. Naturally, one or more memory stores are available on mobile station  202  and SIM  256  to facilitate storage of PIM data items and other information. 
   The PIM application preferably has the ability to send and receive data items via the wireless network. In a preferred embodiment, PIM data items are seamlessly integrated, synchronized, and updated via the wireless network, with the mobile station user&#39;s corresponding data items stored and/or associated with a host computer system thereby creating a mirrored host computer on mobile station  202  with respect to such items. This is especially advantageous where the host computer system is the mobile station user&#39;s office computer system. Additional applications may also be loaded onto mobile station  202  through network  200 , an auxiliary I/O subsystem  228 , serial port  230 , short-range communications subsystem  240 , or any other suitable subsystem  242 , and installed by a user in RAM  226  or preferably a non-volatile store (not shown) for execution by microprocessor  238 . Such flexibility in application installation increases the functionality of mobile station  202  and may provide enhanced on-device functions, communication-related functions, or both. For example, secure communication applications may enable electronic commerce functions and other such financial transactions to be performed using mobile station  202 . 
   In a data communication mode, a received signal such as a text message, an e-mail message, or web page download will be processed by communication subsystem  211  and input to microprocessor  238 . Microprocessor  238  will preferably further process the signal for output to display  222 , to auxiliary I/O device  228  or both as described further herein below with reference to  FIGS. 3–7 . A user of mobile station  202  may also compose data items, such as e-mail messages, for example, using keyboard  232  in conjunction with display  222  and possibly auxiliary I/O device  228 . Keyboard  232  is preferably a complete alphanumeric keyboard and/or telephone-type keypad. These composed items may be transmitted over a communication network through communication subsystem  211 . 
   For voice communications, the overall operation of mobile station  202  is substantially similar, except that the received signals would be output to speaker  234  and signals for transmission would be generated by microphone  236 . Alternative voice or audio I/O subsystems, such as a voice message recording subsystem, may also be implemented on mobile station  202 . Although voice or audio signal output is preferably accomplished primarily through speaker  234 , display  222  may also be used to provide an indication of the identity of a calling party, duration of a voice call, or other voice call related information, as some examples. 
   Serial port  230  in  FIG. 2  is normally implemented in a personal digital assistant (PDA)-type communication device for which synchronization with a user&#39;s desktop computer is a desirable, albeit optional, component. Serial port  230  enables a user to set preferences through an external device or software application and extends the capabilities of mobile station  202  by providing for information or software downloads to mobile station  202  other than through a wireless communication network. The alternate download path may, for example, be used to load an encryption key onto mobile station  202  through a direct and thus reliable and trusted connection to thereby provide secure device communication. 
   Short-range communications subsystem  240  of  FIG. 2  is an additional optional component that provides for communication between mobile station  202  and different systems or devices, which need not necessarily be similar devices. For example, subsystem  240  may include an infrared device and associated circuits and components, or a Bluetooth™ communication module to provide for communication with similarly-enabled systems and devices. Bluetooth™ is a registered trademark of Bluetooth SIG, Inc. 
   In accordance with an embodiment of the invention, mobile station  202  is a multi-tasking wireless communications device configured for sending and receiving data items and for making and receiving voice calls. To provide a user-friendly environment to control the operation of mobile station  202 , an operating system resident on station  202  (not shown) provides a GUI having a main screen and a plurality of sub-screens navigable from the main screen. The tasks performed by the multi-tasking wireless communications device may include e mail composition, e mail message display, web based browsing, calendar, phone list, and e mail message search. 
   In the preferred embodiment, the display on the wireless communications device is a liquid crystal display (LCD), as illustrated in  FIG. 3 . In a general construction, the LCD is composed of three layers: a top substrate, a liquid crystal layer, and a bottom substrate. A liquid crystal display may operate in a light reflective mode when ambient light is sufficient or may be lit by a light source within or on the wireless communications device. When the LCD is illuminated by a light source  308  in a back lighting mode, the top and bottom substrates  302 ,  306  must be sufficiently transparent to provide a viewable display. At least one of the substrates may be an active matrix substrate with thin film transistors. Alternatively, the LCD may be a passive matrix device. Included as part of one or both of the substrates may be one or more brightness enhancing, light scattering, colour filter, black matrix, retarder, and/or adhesive layers. The liquid crystal layer  304  may be twisted nematic, super twisted nematic, cholesteric, discoidal, nematic, or the like. Where feasible, two or more liquid crystals may be used together as a mixture or in adjacent regions of the liquid crystal display. The light source  308  is preferably a light emitting diode (LED) for reasons of cost, compactness, luminance, and weight. The LED is preferably placed behind the liquid crystal display in relation to a viewer, but may be placed, additionally or optionally, at the edge or on the viewer&#39;s side of the liquid crystal display. To maximize the amount of light utilized, a reflector  310  is preferably is disposed beneath the light source  308 . 
   As the light source  308  for the display consumes power as a function of being turned on and intensity when turned on, it is important to optimize the on time and, optionally, intensity. This is accomplished by relating turn on time (and, optionally, intensity) to one or more factors. Factors used in determining the on time for the light source may include the amount of information to be displayed, font size of the characters to be displayed, the type of task being performed, and ambient light levels. Ambient light levels may be sensed by a light sensor and may be used to determine a particular intensity of lighting and/or a particular duration of the lighting. This sensor, if implemented, is preferably placed at the edge of the LCD to minimize a user&#39;s risk of covering up the sensor and to more accurately sense the light level received by the LCD.  FIG. 10  illustrates an embodiment of a method of the present invention in which the light is turned on  902 . If no light has been turned on, other processing continues  904 . When the light is turned on, as by the user hitting the backlight key or from hitting any key in an automatic mode, multiple factors selected by a manufacturer or end user  906  may be incorporated into an algorithm or may be simply multiplied together with a default time to establish a time on value to be loaded into a timer register  908 . The time on value is loaded into the timer  910  for a count down operation or is used in a comparator operation for a count up operation  912 . The timer count up/down continues  914  until the timer times out  912  unless the user scrolls a thumbwheel or pushes a key  922  causing the timer to reload the time on value. An optional dim mode may be implemented  916  such that when a light on timer time out occurs, the end user is not left in the dark but has some warning that the light will be extinguish within a short period of time  918 . That is, the dim mode may cause the light to dim for a preselected time before shutting the light off completely. The dim mode time may be selectable by the manufacturer or end user or both. 
     FIGS. 4 and 5  illustrate more specific embodiments of the method of the present invention. In  FIG. 4 , activity typing  402  and amount of information to be displayed  404  determine a timer quantity. A default time value may also be used to determine the timer quantity. For example, if the activity typing factor were 2, the amount of information were 5, and the default time value were 10 seconds, the resulting time on product would be 100 seconds. The wireless communications device may have a learning mode in which behavioral heuristics of the end user may be kept as to how often a user forces the backlight on or off to determine if time outs need to be lengthened or shortened. In  FIG. 4 , if a behavioral factor were present or selected  406 , the behavioral factor may be multiplied with the timer quantity to determine a new timer quantity. In the embodiment of the method illustrated by  FIG. 5 , the type of activity  502 , the amount of information (or, content)  504 , and the font size (or type)  506  are used to derive the time on of the light source  508 . The amount of information may be determined through the number of ASCII characters to be displayed on the screen, the number of informative ASCII characters to be displayed on the display screen (e.g., characters that are not the space character), the number of data words retrieved from memory for the display, the number of data words buffered representing characters contemporaneously displayed as determined by the selected font size, and the like. 
     FIGS. 6–8  illustrate an embodiment of the method of the present invention in which menus are used to set the light source time on value with an optional dim mode. In  FIG. 6 , the end user or manufacturer may choose to set the time on factors and/or the dim mode duration time from a lighting options menu. In  FIG. 7 , when the time on factors menu is selected, the end user or manufacturer may choose to set the light on timing to the amount of data to be displayed, font size (or type), behavioral heuristics, activity, and the like. The behavioral heuristics may include the keeping of a log file of backlight usage duration for an activity in which the backlight usage duration is averaged and/or is weighted more heavily for recent activity of a user. The log file of backlight usage duration may also be set to cutoff consideration of any usage before a predetermined date such as any activity more than a month old. In  FIG. 8 , a dim mode duration time menu permits the dim mode to be used as a warning to the end user that the lighting is to be timed out. If the dim mode warning is selected, the dim mode warning time out may be set. This could be a value of only one second or two or may be a higher value, such as 30 seconds or one minute. 
   In an embodiment of the present invention, as illustrated in  FIG. 9 , a user profile may be established. The user profile, unique to each user if there are more than one users, may provide a unique default time for illumination duration for an activity, such e mail, calendar, and the main screen. A reset to default may be provided as an option in case for a new user or a user who wishes to have his or her use activity recalibrated. 
   The present invention may be practiced in a variety of ways. The on time may also be made determinable by the type of information on the display, e.g., graphs or photographs. Since some activities, such as e mail composition and message reading, are more likely to benefit than other activities for light source on time adjustability, the invention may be practiced such that only certain activities entered by an end user result in adjustment to the on time for the light source while others require no special adjustment. Although a dim power mode has been described, other power modes may be implemented instead or in addition, such as an idle mode, a screen saver mode, a standby mode, and a power down mode. The light source illuminating the LCD may use discrete levels, as described above, or may have continuously variable light intensity. A dedicated button may be provided on the body of the wireless communications device to permit a user to step through various states, such as high to dim to off to high. 
   The above-described embodiments of the present application are intended to be examples only. Those of skill in the art may effect alterations, modifications and variations to the particular embodiments without departing from the scope of the application. The invention described herein in the recited claims intends to cover and embrace all suitable changes in technology.