Abstract:
The terminal apparatus includes input keys configured to detect pressing conducted thereon respectively, key backlights each of which emits a plurality of colors of light to shine corresponding one of the input keys, and a backlight controller configured to control the plurality of colors of light independently for each of the key backlights. The backlight controller causes the key backlights to emit light of a first color in a case where an input key out of the input keys detects pressing thereon, and changes an emission color of a key backlight corresponding to the input key detecting the pressing from the first color to a second color when a state of the pressing becomes a predetermined state.

Description:
TECHNICAL FIELD 
     The present invention relates to a terminal apparatus, and backlight emission method and computer readable medium for the terminal apparatus. 
     BACKGROUND ART 
     In general, a user uses an input key to manipulate a mobile terminal apparatus such as a mobile phone, a personal handy phone system (PHS) terminal, a personal digital assistant (PDA), and a digital audio player (DAP). For example, usage of a mobile phone provided with a key backlight, which shines key input unit, is becoming more common considering manipulation carried out in the darkness. 
     Providing the key backlight for manipulation using the input key is especially important for the mobile terminal apparatus having down sized keys. 
     As a relating technique, PL 1 discloses a technique that causes an operation key unit to function as unconventional notifying means by making the operation key unit in a main body to emit or blink light in various manners or various colors according to phone operations of the mobile phone. 
     PL 2 discloses a technique that causes keys in an operation unit to emit different colors of light to improve efficiency for key discrimination and key manipulation based on the emission colors at the time of the key backlight emission. 
     As above, regarding the key backlight which emits the light on the key input unit of the mobile phone terminal, the usage of the techniques causing the key backlight to emit light can help key input by the user and enhance the usability. 
     {Citation List} 
     {Patent Literature} 
     
         
         {PL 1} JP-A-2001-217904 
         {PL 2} JP-A-2005-134998 
       
    
     SUMMARY OF INVENTION 
     {Technical Problem} 
     In general, key operations carried out on the mobile terminal apparatus, such as a mobile phone, include a normal operation of pressing a key briefly (hereinafter this operation is referred to as “short-time press”) and a long-time pressing operation (hereinafter this operation is referred to as “long-time press”), that is, pressing a key longer (e.g., pressing for 2 seconds). In view of this point, how long period of pressing the long-time press requires may not be explicit. A period of time required for detecting the long-time press may vary depending on functions, and the user may be confused. 
     However, in the above described techniques, the key backlight which shines the light on the key input unit can be utilized to determine whether the short-time press is conducted but not to determine whether the ling-time press is conducted. 
     It is thus an exemplary object of the present invention is to provide a terminal apparatus and back light emission method and computer readable medium for the terminal apparatus, which helps key input using the key backlight of the terminal apparatus. 
     {Solution to Problem} 
     According to a first aspect of the invention, there is provided a terminal apparatus comprising input keys configured to detect pressing conducted thereon respectively, key backlights each of which emits a plurality of colors of light to shine corresponding one of the input keys, and a backlight controller configured to control the plurality of colors of light independently for each of the key backlights, wherein the backlight controller causes the key backlights to emit light of a first color in a case where an input key out of the input keys detects pressing thereon, and changes an emission color of a key backlight corresponding to the input key detecting the pressing from the first color to a second color when a state of the pressing becomes a predetermined state. 
     According to a second aspect of the invention, there is provided a backlight emission method for a terminal apparatus comprising input keys configured to detect pressing conducted thereon respectively, key backlights each of which emits a plurality of colors of light to shine corresponding one of the input keys, and a backlight controller configured to control the plurality of colors of light independently for each of the key backlights, the method comprising causing the key backlights to emit light of a first color in a case where an input key out of the input keys detects pressing thereon, and changing an emission color of a key backlight corresponding to the input key detecting the pressing from the first color to a second color when a state of the pressing becomes a predetermined state. 
     According to a third aspect of the invention, there is provided a computer readable medium having stored thereon a program which, when executed by a computer, causes a computer to function as a terminal apparatus, the terminal apparatus comprising input keys configured to detect pressing conducted thereon respectively, key backlights each of which emits a plurality of colors of light to shine corresponding one of the input keys, and a backlight controller configured to control the plurality of colors of light independently for each of the key backlights, wherein the backlight controller causes the key backlights to emit light of a first color in a case where an input key out of the input keys detects pressing thereon, and changes an emission color of a key backlight corresponding to the input key detecting the pressing from the first color to a second color when a state of the pressing becomes a predetermined state. 
     {Advantageous Effects of Invention} 
     According to the present invention, the operability of the terminal apparatus can be improved because the key input can be helped using the key backlight of the terminal apparatus. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a view showing a basic configuration according to an embodiment of the invention. 
         FIG. 2  is a view showing an example of installation of a key backlight LED  301  and a basic configuration of a light  302  according to the embodiment of the invention. 
         FIG. 3  is a view showing state transition of the key backlight LED  301  according to the embodiment of the invention. 
         FIG. 4  is a flowchart showing basic operation according to the embodiment of the invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. 
       FIG. 1  shows an example of a circuitry configuration of a mobile phone  1000  which represents an exemplary embodiment of the present invention. 
     The mobile phone  1000  according to the present embodiment includes a CPU  100 , a bus  110 , an input unit  120 , an input key unit  121 , a display controller  130 , a display unit  131 , a transmission/reception unit  140 , a receiver  150 , a backlight controller  160 , a liquid crystal backlight  161 , a key backlight  162 , a working memory  170 , a nonvolatile memory  180 , a read only memory (ROM)  190 , a speaker  200 , and a microphone  210 . 
     The CPU (central processing unit)  100  is an element which executes operational processing and connected with other components of the apparatus via the bus  110 . The input unit  120  includes a circuit which detects key input from the input key unit  121 . A combination of the input unit  120  and the input key unit  121  may function as “input keys” of the invention. 
     The display controller  130  includes a control circuit which controls display on the display unit  131 . The display unit  131  includes a display device which provides user with information, is installed at the front of the main body of the apparatus as shown in  FIG. 2  for example, and may be a display device such as a black and white or color liquid crystal panel or an organic EL (Electro-Luminescence) electronic fluorescent display. 
     The transmission/reception unit  140  includes a portion for transmitting and receiving audio signal and data, and includes a circuit to execute transmission, calling, and communication wirelessly. 
     The receiver  150  includes a device to output sound of a calling party when conducting a call or the like. 
     The working memory  170  includes a storage device to store data which is temporarily required for the CPU  100  to execute a program. As the working memory  170 , for example, a random access memory (RAM) may be employed. 
     The nonvolatile memory  180  includes a semiconductor memory on which data writing and erasing are arbitrarily possible and the contents are not erased if the power is off. Phonebook data, various setting values and user data can also be stored therein. 
     The ROM (read only memory)  190  includes a memory which stores stable data such as a variety of controlling programs to be executed by the CPU  100 . 
     The speaker  200  includes a device to output ringtone, voice sound, beep sound and the like. 
     The microphone  210  includes a device to convert audio sound into an electrical signal for audio transmission. 
     The backlight controller  160  includes a circuit to control the liquid crystal backlight  161  and the key backlight  162 . In the present embodiment. The backlight controller  160  includes an RGB controller  160 - 1 . 
     In addition, the key backlight  162  includes a lighting device such as a light emitting diode (LED) or the like, and includes respective three lighting elements of R, G and B. 
       FIG. 2  shows an example of installation position of the key backlight  162 . In the present embodiment, it is assumed that the key backlight  162  includes an LED-using light, which, hereinafter and in the drawings, is to be referred to as key backlight LED  301 . 
     In  FIG. 2 , a light  302  used in the key backlight LED  301  includes a tricolor LED. 
     The light  302  includes three lighting elements of R, G, and B for example, and connected to the RGB controller  160 - 1 . 
     The RGB controller  160 - 1  controls brightness and emission times of the lighting elements of R, G, and B. It is possible that the user arbitrarily sets certain emission and extinction patterns. 
     The key backlight LED  301  is installed under every or an arbitrary key of the mobile phone  1000 , or installed nearby. In the figure, such an example is shown that a plurality of the key backlight LEDs  301  are positioned horizontally in three rows and vertically in seven columns. The respective  21  key backlight LEDs  301  can be independently controlled by the backlight controller  160 . 
       FIG. 3  shows a change of emission color of an LED which is positioned directly under “#” key. In the left portion of the figure, A- 1  shows a state before the change of emission color, and A- 2  in the right portion of the figure shows a state after the change of the emission color of the LED directly under “#” key. Referring to  FIG. 3 , it can be understood that only the emission color of the LED  301 , which is positioned directly under “#” key, is changed from a color A to a color B. 
     Next, operation of the present embodiment will be described. Throughout the description, it is assumed by way of example that when “#” key is pressed in the long-time press manner, a manner mode is started. 
       FIG. 4  shows a flowchart expressing a procedure of processing according to the present embodiment. To be specific, such procedure is shown that in the case where a key backlight emits light in response to key pressing (i.e., light is once emitted in the state in which the short-time press is conducted), when the key pressing is determined to be the long-time press, the color of light from the key backlight is changed, and when the key is released, the color of light returns to the original color. 
     First, the mobile phone  1000  is set in a waiting state for pressing of the input key unit  121  (step S 101 ). 
     Subsequently, when “#” key, which is an exemplary key in the input key unit  121  to be pressed under the state of step S 101 , is pressed, the input unit  120  detects key input. Then, in response, every key backlight LED  301  emits light of color A under the control of the backlight controller  160  (step S 102 ). 
     What color the emission color A is may be set by the user or the setting may be settled at default. The state in which every key backlight LED  301  emits light of color A in step S 102  is shown as the state of A- 1  in  FIG. 3 . 
     Next, it is determined whether the key input is the long-time press or not based on the key input detected by the input unit  120  (step S 103 ). 
     When the long-time press is detected (Yes in step S 103 ), the color of a key backlight LED  301  corresponding to a key which is under the long-time press is changed from color A to color B under the control of the backlight controller  160 . Similarly to the color A, the emission color B may be set by the user or may be fixed. Then, at the time, the CPU  100  executes “transition to the manner mode,” which is assigned to the long-time press of “#” key (step S 104 ). This state is shown as the state A- 2  in  FIG. 3 . 
     Next, the mobile phone  1000  gets into a waiting state for key release (step S 105 ). After the waiting state for key release of step S 105  is set, when the input key unit  121  being pressed is released, the emission color of the key back light LED  301  being changed into the color B in step S 104 , is returned to the original color i.e., color A under the control of the backlight controller  160 . This state is shown as the state of A- 1  in  FIG. 3 . 
     On the other hand, when the key pressing is not determined as the long-time press (No in step S 103 ) the CPU  100  executes a function which is assigned to the short-time press. For example, when “a” key is pressed in the short-time press manner, processing is executed under the condition that dialing input for “#” key is conducted (step S 107 ). 
     As described above, when the long-time press is detected, emission color of a corresponding key backlight LED is changed, and it is easy for user to see that the long-time press is conducted, so that the usability can be enhanced according to the present embodiment. 
     In addition, such an advantage can be realized that more entertaining mobile terminal apparatus in which a key coloring is changed depending on key operation can be provided. 
     The components of the embodiment can be variously changed or altered. Hereinafter, some examples of the changing and altering will be shown. Only examples of the embodiment will be described below, and it will be understood for a person skilled in the art to make other changing or altering than the description below within the technical scope of the invention. 
     In the above description, the mobile phone terminal is employed for describing the embodiment of the invention; however, similar advantage can be realized in another mobile terminal apparatus such as a PHS, PDA, and DAP by changing an emission color of a light emitting element in response to the long time press of a key for helping key operation. 
     In the above description, every key backlight LED  301  emits light of color A at step S 102  in  FIG. 4 ; however, emission color may vary among the light emission elements as the light emission elements are independently controllable. If only an emission color of a key backlight LED corresponding to the pressed key is changed, the similar advantage can be realized. Not only causing every key back light LED  301  to emit, such configuration is possible that plural keys are arbitrarily selected in advance and key backlight LEDs  301  corresponding to the selected keys are caused to emit light. For example, only key backlight LEDs  301  corresponding to numeral keys may be caused to emit light. 
     In the above description, when the long-time press is determined in step S 103  (Yes in step S 103 ), the color change from color A to color B is executed. In this regard, when the color change to color B is conducted gradually until step S 104  after the key back light LEDs  301  are caused to emit light of color A in step S 102 , the similar advantage can be achieved. As an example of gradual change of the emission color, when the emission color is changed from red to blue, such gradual change is available as “red→red-purple→purple→bluish-purple→blue.” 
     In the above description, when the long-time press is determined in step S 103  (Yes in step S 103 ), the color change from color A to color B is executed; however, instead of the color change from color A to color B, light extinction provides the similar advantage. 
     In the above description, when the long-time press is determined in step S 103  (yes in step S 103 ), the color change from color A to color B is executed; however, the similar advantage can be realized when the emission color is fixed to color A but the brightness is raised. 
     In the above description, the long-time press of “#” key is described by way of example; however the embodiment can be applied to key operation of other key than “#” key. 
     In the above description, only a key backlight LED  301  corresponding to a pressed key is subjected to the color change; however, an emission color corresponding to a surrounding key such as a key on the left, right, up, or below of the pressed key can also be changed. Alternatively, emission color of key backlight LEDs  301  corresponding to keys other than the pressed key can be changed. 
     The emission color of the key backlight LED  301  corresponding to the pressed key and the emission color of all of the remaining key backlight LEDs  301  can be changed. In such a case, emission colors of all of the key backlight LEDs  301  are subjected to the color change. 
     In the above description, every key backlight LED  301  is independently RGB controllable; however, even in the case where merely some (or one) of the key backlight LEDs  301  are independently RGB controllable, when the embodiment is applied to those keys, the similar advantage can be achieved. That is, it is not necessarily required that the LED  301  of every key is set to be independently RGB controllable. 
     In the above description, the embodiment is applied to confirm acceptance of the long-time press; however, the color change can also be applied to the short-time press. In such a case, it can be embodied that the emission color of the key backlight LED corresponding to the pressed key is changed for a given period (for example, 500 msec) as well as executing the function assigned to the short-time press in step S 107  in  FIG. 4 . 
     The terminal apparatus according to the embodiment can be implemented by hardware, software, or combination thereof. The terminal apparatus according to the embodiment can be implemented by a computer readable medium having stored thereon a program to be executed by a computer causing the computer to function as the terminal apparatus. 
     This application is the National Phase of PCT/JP2009/063219, filed Jul. 23, 2009, which is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2008-207854, filed on Aug. 12, 2008. The contents of Japanese Patent Application No. 2008-207854 will be incorporated in the contents of description of this application. Although the exemplary embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions and alternatives can be made therein without departing from the sprit and scope of the invention as defined by the appended claims. Further, it is the inventor&#39;s intent to retain all equivalents of the claimed invention even if the claims are amended during prosecution. 
     {Industrial Applicability} 
     The present invention is preferably applicable to helping key input for a mobile terminal apparatus such as a mobile phone terminal, a PHS terminal, a PDA, and a DAP, provided with a key backlight which shines a key input unit. 
     {Reference Signs List} 
     
         
         
           
               100 : CPU 
               110 : bus 
               120 : input unit 
               121 : input key unit 
               130 : display controller 
               131 : display unit 
               140 : transmission/reception unit 
               150 : receiver 
               160 : backlight controller 
               160 -I: RGB controller 
               161 : liquid crystal backlight 
               162 : key backlight 
               170 : working memory 
               180 : nonvolatile memory 
               190 : ROM 
               200 : speaker 
               210 : microphone 
               301 : key backlight LED 
               302 : light 
               1000 : mobile phone