Abstract:
A portable electronic apparatus has light sources that can be controlled to produce decorative or informational effects. Each light source is controlled by the combination of an enable signal from a 1-bit port of a controller and a PWM signal from a PWM signal from the controller. Each PWM signal is used to control a plurality of light sources in parallel whereas each 1-bit enabled signal controls, generally, only one. The light sources are preferably arranged to shine through soft structures on the apparatus.

Description:
FIELD OF THE INVENTION  
       [0001]     The present invention relates to a portable electronic apparatus such as a mobile phone, a personal digital assistant (PDA) or the like.  
       BACKGROUND TO THE INVENTION  
       [0002]     Conventionally mobile phones and the like indicate events, such as incoming calls or text messages, using audible alerts.  
       SUMMARY OF THE INVENTION  
       [0003]     It is an object of the present invention to provide a mobile phone, PDA or the like with informative and/or decorative lighting effects.  
         [0004]     According to the present invention, there is provided a portable electronic apparatus, for example a personal communication apparatus such as a mobile phone or a communicator, comprising: 
        a group of, preferably externally visible, light sources, e.g. LE Ds emitting light in the visible spectrum, and     a programmable controller device having a plurality of 1-bit outputs connected for controlling the light sources and a pulse width modulated signal output for controlling said group of light sources,     wherein each light source is controlled by means of one of said 1-bit outputs and said PWM output.        
 
         [0008]     Each light source may be controlled by a respective one of said 1-bit outputs.  
         [0009]     The apparatus may include a plurality of bipolar transistors connected to receive a signal from respective 1-bit outputs of the controller device at their bases, with each light source being controlled by one of said transistors. Such an apparatus may also include an insulated-gate FET, connected to receive a signal from the PWM output of the controller, with the emitters of said transistors are connected to the drain of the FET via respective emitter resistors.  
         [0010]     The light sources may be controlled individually by respective first switching means, connected to be controlled from said 1-bit outputs, and collectively by second switching means, connected to the controlled from said PWM signal output, in which case, the second switching means, is connected in series with all of said first switching means.  
         [0011]     According to the present invention, there is also provided a portable electronic, for example a personal communication apparatus such as a mobile phone or a communicator, apparatus comprising: 
        a plurality of groups of, preferably externally visible, light sources, e.g. LEDs emitting light in the visible spectrum, and     a programmable controller device having a plurality of 1-bit outputs connected for controlling the light sources and a plurality of pulse width modulated signal outputs for controlling respective ones of said groups of light sources,     wherein each light source is controlled by means of one of said 1-bit outputs and one of said PWM outputs.        
 
         [0015]     Each light source may be controlled by a respective one of said 1-bit outputs.  
         [0016]     The apparatus may include a plurality of bipolar transistors connected to receive signals from respective 1-bit outputs of the controller device at their bases, with each light source being controlled by one of said transistors. Such an apparatus may include a plurality of insulated-gate FET, connected to receive a signal from one of said PWM outputs of the controller, with the emitters of said transistors being connected to the drain of one or other of the FETs via respective emitter resistors according to the groups to which the light sources, controlled by the transistors, belong.  
         [0017]     The light sources may be controlled individually by respective first switching means, e.g. bipolar transistors or field-effect transistors, connected to be controlled from said 1-bit outputs, and groupwise by second switching means e.g. bipolar transistors or field-effect transistors, connected to the controlled from said PWM signal outputs, with each second switching means being connected in series with all of said first switching means associated with the same group of light sources.  
         [0018]     According to the present invention, there is also provided a portable electronic apparatus, for example a personal communication device, comprising a body and a soft structure on the body, wherein the soft structure is visible light transmissive, e.g. fully or partially transparent or translucent, and a light source is mounted to the body so as to shine light through said structure.  
         [0019]     The light source may comprise at least one device, for example an LED.  
         [0020]     A plurality of soft structures may be included on the body; in which case, each soft structure will be visible light transmissive and a group of light sources is mounted to the body to shine light through said structures.  
         [0021]     The light sources may be controlled using the 1-bit and PWM controller outputs mentioned above. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0022]      FIG. 1  is a front view of a mobile phone embodying the present invention;  
         [0023]      FIG. 2  is a side view of the mobile phone shown in  FIG. 1 ;  
         [0024]      FIG. 3  is a block diagram of the mobile phone shown in  FIG. 1 ; and  
         [0025]      FIG. 4  is a schematic diagram of the light source controlling circuit of the mobile phone shown in  FIG. 1 . 
     
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS  
       [0026]     Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings.  
         [0027]     Referring to  FIGS. 1 and 2 , a mobile phone comprises a body  1  having a liquid crystal display  8  in the upper part of its front face and keypad  9  in the lower part of its front face. A speaker  5  is located above the display  8  and a microphone  6  is located below the key pad  9 . Two soft, transparent pads  12 , forming grips, are formed on each of the left and right sides of the body  1 , one above the other. The pads  12  may be coloured. The pads  12  comprise polyurethane shells filled with a gel. The pads  12  help users hold the mobile phone securely and comfortably.  
         [0028]     Two light emitting diodes  13  (LEDs) are located behind each of the pads  12 . The LEDs are controlled, as will be described below, to provide decorative and/or informative lighting effects.  
         [0029]     Referring to  FIG. 3 , the mobile phone additionally comprises an antenna  15 , an rf subsystem  2 , a baseband DSP (digital signal processing) subsystem  3 , an analogue audio subsystem  4 , a controller  7 , memory  10 , a SIM card  11  and an LED driver circuit  14  for energising the LEDs  13  under the control of the controller  7 .  
         [0030]     The rf subsystem  2  contains if and rf circuits of the mobile telephone&#39;s transmitter and receiver and a frequency synthesizer for tuning the mobile station&#39;s transmitter and receiver. The antenna  15  is coupled to the rf subsystem  2  for the reception and transmission of radio waves.  
         [0031]     The baseband DSP subsystem  3  is coupled to the rf subsystem  2  to receive baseband signals therefrom and for sending baseband modulation signals thereto. The baseband D SP subsystems  3  includes codec functions which are generally well-known in the art. However, the codec functions include a novel Viterbi decoder, which is described in more detail below, for channel decoding. The output of the Viterbi decoder is then further decoded to regenerate the original speech signal in the case of telephony.  
         [0032]     The analogue audio subsystem  4  is coupled to the baseband DSP subsystem  3  and receives demodulated audio therefrom. The analogue audio subsystem  4  amplifies the demodulated audio and applies it to the speaker  5 . Acoustic signals, detected by the microphone  6 , are pre-amplified by the analogue audio subsystem  4  and sent to the baseband DSP subsystem  3  for coding.  
         [0033]     The controller  7  controls the operation of the mobile telephone. It is coupled to the rf subsystem  2  for supplying tuning instructions to the frequency synthesizer and to the baseband DSP subsystem  3  for supplying control data and management data for transmission. The controller  7  operates according to a program stored in the memory  10 . The memory  10  is shown separately from the controller  7 . However, it may be integrated with the controller  7 .  
         [0034]     The display device  8  is connected to the controller  7  for receiving control data and the keypad  9  is connected to the controller  7  for supplying user input data signals thereto.  
         [0035]     The controller  7  is programmed to control the mobile station for speech and data communication and with application programs, e.g. a WAP browser, which make use of the mobile station&#39;s data communication capabilities. The controller  7  is also programmed to produced different lighting effects by selectively energising the LEDs  12 .  
         [0036]     Referring to  FIG. 4 , in which pull-up and biasing resistors and other common ancillary components are omitted for clarity&#39;s sake, the controller  7  has first to eighth independently controllable 1-bit output ports  7   a , . . . ,  7   h  and first and second independently controllable pulse with modulated (PWM) signal outputs  7   i ,  7   j.    
         [0037]     The LED driver circuit  14  comprises first to eighth bipolar transistors  14   a , . . . ,  14   h . The bases of the bipolar transistors  14   a , . . . ,  14   h  are connected to respective output ports  7   a , . . . ,  7   h  of the controller  7 . The collectors of the bipolar transistors are connected to the cathodes of respective ones  13   a   1 , . . . ,  13   a   4 ,  13   b   1 , . . . ,  13   b   4  of the diodes  13 . The anodes of the diodes  13  are connected to Vcc.  
         [0038]     The first to fourth bipolar transistors  14   a , . . . ,  14   d  have respective emitter resistors  14   k , . . . ,  14   n . The emitter resistors  14   k , . . . ,  14   n  connect the emitters of the first to fourth bipolar transistors  14   a , . . . ,  14   d  to the drain of a first MOSFET  14   o . The source of the first MOSFET  14   o  is connected to ground and its gate is connected to the first PWM signal output  7   i  of the controller  7 .  
         [0039]     The fifth to eighth bipolar transistors  14   e , . . . ,  14   h  are similarly arranged with respective emitter resistors  14   p , . . . ,  14   s  and a second MOSFET  14   t . The gate of the second MOSFET  14   t  is connected to the second PWM signal output  7   j  of the controller  7 .  
         [0040]     The LEDs  13   a   1 , . . . ,  13   a   4 ,  13   b   1 , . . . ,  13   b   4  can be individually and independently enabled by the controller  7  using the signals at the 1-bit output ports  7   a . However, the intensities of the LEDs  13   a   1 , . . . ,  13   a   4 ,  13   b   1 , . . . ,  13   b   4  are controlled by the PWM signals from the first and second PWM signal outputs  7   i ,  7   j . It can be seen that for the purpose of control, the LEDs  13   a   1 , . . . ,  13   a   4 ,  13   b   1 , . . . ,  13   b   4  are divided into two groups  13   a ,  13   b  controlled respectively from the first and second PWM signal outputs  7   i ,  7   j . The LED intensities can set by the duty cycles of the PWM signals when the frequencies of the PWM signals are greater than about 25 Hz. Below about 25 Hz the on/off operation of LEDs  13   a   1 , . . . ,  13   a   4 ,  13   b   1 , . . . ,  13   b   4  in response to the PWM signals is perceptible and, at these lower frequencies, the PWM signals can be used to generate complex LED flashing sequences in combination with suitable LE D enable signals from the 1-bit outputs  7   a , . . . ,  7   h.    
         [0041]     The controller  7  is a program controlled device and the programming required to control the LEDs  13   a   1 , . . . ,  13   a   4 ,  13   b   1 , . . . ,  13   b   4  will be readily apparent to the skilled person from the foregoing. Different patterns of illumination using the LEDs  13  may be used to signal different events such as incoming calls or text messages or to accompany games, being played on the mobile phone, or other apparatus, in which the present invention is embodied.  
         [0042]     The grouping of the LEDs  13   a   1 , . . . ,  13   a   4 ,  13   b   1 , . . . ,  13   b   4  for control purposes is independent of their physical arrangement on the mobile phone&#39;s body  1 . For example, the LE Ds  13  on the left side of the mobile phone&#39;s body may all be in one group  13   a  and the LEDs  13  on the other side of the mobile phone may all be in the other group  13   b . Alternatively, the LEDs  13  may be arranged such that alternate LE Ds  13  belong to different groups  13   a ,  13   b.    
         [0043]     The skilled person will appreciate that the present invention may be applied to other portable electronic devices where the number of PWM signals is limited and that various alternatives and equivalents to the elements described above may be used without departing from the spirit or scope of the claims appended hereto.