Abstract:
A selective call radio apparatus includes a display unit, a storage unit for storing messages, an operation unit used to input instructions and data, a message receiving unit, and a control unit. The control unit reads out the messages from the storage unit to display on the display unit in a first display attribute in a message display mode in response to a display instruction supplied from the operation unit. Also, the control unit displays a new messages on the display unit in a second display attribute different from the first display attribute when the new message is received by the message receiving unit during the display of the messages.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a radio selective call apparatus, and more particularly to a selective call radio apparatus having a function of displaying received messages on a display section. 
     2. Description of the Related Art 
     In a conventional selective call radio apparatus, received messages are stored in a storage section in the sequence of reception or in the predetermined order of priority. Instead, the received messages are classified into categories. The received messages stored in the storage section are read out and displayed on a display section upon a switching operation performed by a user of the selective call radio apparatus. Such a selective call radio apparatus is disclosed in Japanese Laid Open Patent Application (JP-A-Heisei 3-175827) and Japanese Examined Patent Application (JP-B-Heisei 6-50838). 
     Dozens of messages such as news and weather forecasts are sent per day in data receiving service to the selective call radio apparatus described above. However, those received messages are no read out and displayed each time every message is received. In ordinary use, whether any message has arrived at the receiver is checked occasionally. If there are any messages not yet read, the messages received after the previously read message are read out successively. Therefore, depending on condition, tens of messages may be read out successively. The receiver operates in such a manner that it displays the received latest message on the display section, when it receives the latest message during the readout of the messages. 
     More specifically, as shown in  FIG. 1 , in the conventional method, the messages are read out in the order of the message # 1  ( 201 )→ the message # 2  ( 202 )→ the message # 3  (# 203 )→. . . → the message #m ( 204 ). If the latest message is received during the reading of the message #m ( 204 ), the latest message ( 205 ) is displayed firstly. The next message to be displayed after the user finishes viewing the latest message is the message # 1  ( 206 ). Since the latest message is received, the message # 1  is secondary in recentness to the latest message. If the user continues the message reading, the message # 2  ( 207 ) and the message # 3  ( 203 ) are displayed in the described order. 
     In this way, the conventional selective call radio apparatus described above operates in such a manner that when it receives the latest message during the readout of the stored messages, it displays the received latest message on the display section. In this case, however, the latest message is suddenly displayed while the user is viewing the messages. Such a display operation is confusing for the user. This causes a problem in that the user cannot distinguish the latest message from other messages. That is, there is the possibility of the user mistaking the latest message for a message received in the past. 
     Also, when the user reads out the next message after the user has viewed the latest message, the message # 1  is displayed again, regardless of whether the user had viewed the messages until then. 
     SUMMARY OF THE INVENTION 
     The present invention is accomplished to solve the above problems. Therefore, an object of the present invention is to provide a selective call radio apparatus with an improved message display function, in which the user can understand that a displayed message is the latest one, when the latest message is received and displayed during display of other message. 
     Another object of the present invention is to provide a selective call radio apparatus with an improved message display function, in which messages can be effectively displayed. 
     In order to achieve an aspect of the present invention, a method of displaying messages in a selective call radio apparatus includes the steps of: 
     displaying messages, which are already received, on a display unit in a first display attribute in a message display mode in response to a display instruction; 
     when a new message is received during the display of the messages, temporarily stopping the display of the messages on the display unit in the message display mode; and 
     displaying the new message on the display unit in a second display attribute different from the first display attribute. 
     The second display attribute may be a color inversion or a highlighted display. 
     Also, the messages may be displayed on the display unit in an order in the first display attribute in the message display mode. In this case, the display of the new message is stopped in response to a display continuation instruction, and then remaining ones of the messages are displayed in the order in the first display attribute in the message display mode, after the stop of the display of the new message. 
     In the above, the order may be an order of reception of the messages. In this case, each of the messages is received and stored the received in a memory in the order of reception of the messages. Thus, the messages are sequentially read out from the memory in the order of reception of the messages. 
     Also, each of the messages may be received and stored in a memory together with a reception time. Thus, the messages are sequentially read out from the memory based on the reception times of the messages. In this case, the messages may be sequentially read out from the memory based on the reception times of the messages and a reference time. The reference time may be designated. In this case, the reference time and the reception time of each of the messages are compared with each other and ones of the messages previous to the reference time may be sequentially read out from the memory. 
     In order to achieve another aspect of the present invention, a selective call radio apparatus includes a display unit, a storage unit for storing messages, an operation unit used to input instructions and data, a message receiving unit, and a control unit. The control unit reads out the messages from the storage unit to display on the display unit in a first display attribute in a message display mode in response to a display instruction supplied from the operation unit. The control unit displays a new messages on the display unit in a second display attribute different from the first display attribute when the new message is received by the message receiving unit during the display of the messages. 
     The control unit displays the messages on the display unit in an order of reception of the messages in the first display attribute in the message display mode. Also, the control unit displays remaining ones of the messages in the order of reception in the first display attribute, in response to a display continuation instruction supplied from the operation unit. In this case, the control unit sequentially stores the messages received by the message receiving unit in the storage unit in the order of reception of the messages. The control unit includes a read pointer and a write pointer, and stores the message received by the message receiving unit in the storage unit using the write pointer and sequentially reads the messages from the storage unit using read pointer. 
     Also, the control unit may include a timer and a reference time register for holding a reference time. In this case, the control unit stores the message received by the message receiving unit in the storage unit together with a reception time from the timer, and sequentially reads out the messages from the storage unit based on the reception times of the messages and the reference time. The control unit sets the reference time in the reference time register when the reference time is supplied from the operation unit. The control unit sequentially reads ones of the messages previous to the reference time from the storage unit. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a diagram to explain a conventional message display function; 
         FIG. 2  is a block diagram illustrating the structure of a selective call radio apparatus with a message display function according to an embodiment of the present invention; 
         FIG. 3  is a diagram to explain the message display function according to the embodiment of the present invention; and 
         FIGS. 4 and 5  are flowcharts showing a message display operation according to the embodiment of the present invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A selective call radio apparatus of the present invention will be described below in detail with reference to the attached drawings. 
       FIG. 2  is a block diagram illustrating the structure of the selective call radio apparatus with a message display function such as a pager according to the embodiment of the present invention. Referring to  FIG. 1 , the selective call radio apparatus according to the embodiment of the present invention is composed of an antenna  1 , a radio section  2 , a waveform shaping circuit  3 , a control section  4 , a rewritable ROM (Read-Only Memory)  5 , a RAM (Random Access Memory)  6 , a display driver  7 , a display section  8 , amplifier circuits  9  and  11 , a speaker  10 , an LED (Light-Emitting Diode)  12 , a power supply switch  13 , a clock generating circuit  14 , a power supply  15 , a switch  16  and a counter  17  as a read pointer. The power supply switch  13  and the switch  16  are contained in an operation section (not shown) which is used to input instruction and data. 
     The antenna  1  receives a radio signal. The received radio signal is amplified and demodulated by the radio section  2 . The demodulated signal is converted by the waveform shaping circuit  3  to one having such a waveform as can be read by the control section  4 . 
     The control section  4  includes a write pointer (not shown) and operates based on a program stored in the ROM  5 . The control section  4  compares its own call number, which has been written in advance in the ROM  5 , with the signal supplied from the waveform shaping circuit  3 . When there is a coincidence between them, the control section  4  controls the amplifier circuit  9  to drive the speaker  10  such that alarm sound is sent out from the speaker  10 . Also, the control section  4  controls the amplifier circuit  10  to drive the LED  12  such that the LED  12  is lighted. Thus, a call arrival is informed to the user. 
     When the received radio signal contains a message, the control section  4  stores the message in the RAM  6  using the write pointer. Also, when the message is displayed, the control section  4  reads out the message from the RAM  6  using the read pointer and controls the display driver  7  to drive the display section  8  such that the message is displayed. 
     In the selective call radio apparatus according to the embodiment of the present invention, the power supply is turned on in response to the operation of the power supply switch  13 . At this time, the selective call radio apparatus operates in accordance with the clock signal supplied from the clock generating circuit  14 , when the power supply  15  is turned on. Message selection is performed using the switch  16 , and the counter  17  counts messages read out at the message readout time. The control section  4  reads messages stored in the RAM  6  using the read pointer to display on the display section  8 . While the user is reading the messages successively, the counter  17  counts how many messages are read out. 
     When the latest message is received during the reading operation of the messages, the current message display is temporarily stopped or interrupted. Then, the latest message is displayed in such a way that it is distinguishable from other messages. When the display of the latest message is completed in response to a display continuation instruction supplied from the operation unit, the message next to the message which has been displayed immediately before the latest message is displayed based on the count of the counter  17  as the read pointer. 
       FIG. 3  is a diagram illustrating a message display function according to the embodiment of the present invention. A difference between the message display function according to the embodiment of the present invention and the conventional message display function will now be described with reference to  FIGS. 1 ,  2  and  3 . 
     When the user reads out the messages, the messages are displayed in the order of their reception times, namely in the order from the latest message up to the oldest message. According to the embodiment of the present invention, the messages are read out in the order of a message # 1  ( 101 )→ a message # 2  ( 102 )→ a message # 3  ( 103 )→ . . . → a message #m ( 104 ). 
     If the latest message is received during the reading of the message #m ( 104 ), the display of message #m is interrupted and the latest message is displayed. The latest message ( 105 ) is displayed in a color inversion so that the latest message can be distinguished from the messages which the user has viewed until then. Thus, the latest message is displayed in a display attribute different from that of the messages which the user has viewed until then. The latest message may be displayed in a highlighted display or in boldface display or by way of varying the typeface. 
     When the user attempts to view the next message to input a display continuation instruction from the operation unit, the control returns to the message display state in which the user had viewed last. That is, following the latest message, the message #m ( 106 ), a message #m+1 ( 107 ), a message #m+2 ( 108 ) . . . are displayed in the described order. 
       FIGS. 4 and 5  are flowcharts showing a message display operation of the selective call radio apparatus according to the embodiment of the present invention. The message display operation according to the embodiment of the present invention will now be described with reference to  FIGS. 2  to  5 . 
     According to the selective call radio apparatus, a message wait screen is initially displayed (a step S 1  shown in FIG.  4 ). When attempting to read the messages stored in the RAM  6 , the user inputs a message display instruction from the operation unit. At this time, the screen is switched from the message wait screen to a message display screen (step S 2  shown in FIG.  4 ). Then, the message # 1  having the most recent reception time among the messages received up to the present time is displayed (step S 3  shown in FIG.  4 ). 
     After the above message # 1  is displayed, it is determined whether the user wants to read the next message, based on a next message display instruction. The next message display instruction is inputted as the operation of the switch  16  of the operation unit. When the user performs no operation (No at a step S 4  shown in FIG.  4 ), a step S 5  is executed. At the step S 5 , it is determined whether a manual reset instruction as a message wait instruction is inputted through an operation of a reset switch (not shown) of the operation unit. If the manual reset instruction is not inputted (No at the step S 5 ), the control returns to the step S 4 . If the manual reset instruction is inputted (Yes at the step S 5 ), the control returns to the step S 1 . Also, when a predetermined time elapses without any operation of the operation unit after the message # 1  has been displayed, an automatic reset instruction is issued as the message wait instruction (Yes at the step S 5 ). As a result, the control returns to the step S 1 . 
     On the other hand, when wanting to read the next message, the user performs the switching operation of the switch  16  while the message # 1  is displayed (Yes at the step S 4 ), so that the counter  17  is incremented by “1”. Then, message # 2  having reception time recent next to the message # 1  is read from the RAM  6 , and displayed on the display section  8  through the display driver  7  (a step S 6  shown in FIG.  3 ). 
     After the message # 2  is displayed, it is determined whether the user wants to read the next message. When the user performs no operation (No at the step S 7  shown in FIG.  4 ), a step S 8  is executed, as in the above step S 4 . At the step S 8 , it is determined whether a manual reset instruction as the message wait instruction is inputted from the operation unit. If the manual reset instruction is not inputted (No at the step S 8 ), the control returns to the step S 7 . If the manual reset instruction is inputted (Yes at the step S 8 ), the control returns to the step S 1 . Also, when a predetermined time elapses without any operation of the operation unit after the message # 2  has been displayed, the automatic reset instruction is issued as the message wait instruction (Yes at the step S 8 ), as in the step S 5 . As a result, the control returns to the step S 1 . 
     On the other hand, when wanting to read the next message, the user performs the switching operation of the switch  16  while the message # 2  is displayed (Yes at the step S 7 ), the counter  17  is incremented by “1”. Then, message # 3  having reception time recent next to the message # 2  is read from the RAM  6 , and displayed on the display section  8  through the display driver  7 . 
     It is supposed that the latest message is received while a message #m is displayed at a step S 9  through the above-mentioned operations. If the latest message is not received (No at a step S 10  shown in FIG.  5 ), the control advances to a step S 11 . In case where the latest message has been received, the control advances to a step S 13  to display the latest message on the display section  8 . The latest message is displayed in a display attribute different from those of the messages # 1  to #m to be distinguishable from other messages (the step S 13  shown in FIG.  5 ). 
     After the latest message is displayed, it is determined whether the user wants to read the next message. When the user performs no operation (No at a step S 14  shown in FIG.  5 ), a step S 15  is executed, as in the above step S 4 . At the step S 15 , it is determined whether the manual reset instruction as the message wait instruction is inputted from the operation unit. If the manual reset instruction is not inputted (No at the step S 15 ), the control returns to the step S 14 . If the manual reset instruction is inputted (Yes at the step S 15 ), the control advances to the step S 1 . Also, when the predetermined time elapses without any operation of the operation unit after the latest message has been displayed, the automatic reset instruction is issued as the message wait instruction (Yes at the step S 15 ), as in the step S 5 . As a result, the control advances to the step S 1 . 
     On the other hand, when wanting to read the next message, the user performs the switching operation of the switch  16  while the latest message is displayed (Yes at the step S 14 ), the counter  17  is incremented by “1”. In this case, however, since the latest message is stored in the RAM  6 , the number of messages stored in the RAM  6  increases by “1”. Therefore, a message #m is read out from the RAM  6  again and displayed on the display section  8  through the display driver  7  (a step S 16  shown in FIG.  5 ). Thus, the switching operation of the switch  16  functions as a display continuation instruction. 
     After the message #m is displayed, it is determined whether the user wants to read the next message. When the user performs no operation (No at the step S 17  shown in FIG.  5 ), a step S 18  is executed, as in the above step S 4 . At the step S 18 , it is determined whether the manual reset instruction as the message wait instruction is inputted from the operation unit. If the manual reset instruction is not inputted (No at the step S 18 ), the control returns to the step S 17 . If the manual reset instruction is inputted (Yes at the step S 18 ), the control returns to the step S 1 . Also, when a predetermined time elapses without any operation of the operation unit after the message #m has been displayed, the automatic reset instruction is issued as the message wait instruction (Yes at the step S 18 ), as in the step S 5 . As a result, the control returns to the step S 1 . 
     On the other hand, when wanting to read the next message, the user performs the switching operation of the switch  16  while the message #m is displayed (Yes at the step S 17 ), the counter  17  is incremented by “1”. Then, message #(m+1) having reception time recent next to the message #m is read from the RAM  6 , and displayed on the display section  8  through the display driver  7 . 
     In this way, if the user wants to continue the message display, the same operations as those described above are repeated such that the message #m+1, the message #m+2, . . . are displayed on the display section  8  in the order of recentness of their reception times. 
     AS described above, in the case where no latest message is received during the message display (the step S 10  shown in FIG.  5 ), the control advances to the step S 11 . In this case, after the message #m is displayed, it is determined whether the user wants to read the next message. When the user performs no operation (No at the step S 11  shown in FIG.  5 ), a step S 12  is executed, as in the above step S 4 . At the step S 12 , it is determined whether the manual reset instruction as the message wait instruction is inputted from the operation unit. If the manual reset instruction is not inputted (No at the step S 12 ), the control returns to the step S 10 . If the manual reset instruction is inputted (Yes at the step S 12 ), the control returns to the step S 1 . Also, when the predetermined time elapses without any operation of the operation unit after the message #m has been displayed, the automatic reset instruction is issued as the message wait instruction (Yes at the step S 12 ), as in the step S 5 . As a result, the control returns to the step S 1 . 
     On the other hand, when wanting to read the next message, the user performs the switching operation of the switch  16  while the message #m is displayed (Yes at the step S 11 ), the counter  17  is incremented by “1”. Then, the control advance to a step S 19  to read message #(m+1) having reception time recent next to the message #m from the RAM  6  to display on the display section  8  through the display driver  7 . 
     When the messages from message # 1  to the last message #n in this case have been all read in the above-described manner (a step S 20  shown in FIG.  5 ), the message display operation is terminated and the control returns to the initial wait screen at the step S 1  (a step S 21  shown in FIG.  5 ). If the remaining messages are present, the same operations as those of the step S 9  to S 19  are repeated. 
     Thus, under the condition that the ROM  6  contains n messages stored therein, if the latest message is received at the time the user has read the m messages from message # 1  to message #m, the latest message is firstly displayed on the display section  8  as shown in FIG.  3 . At this time point, the number of messages stored in the ROM  6  becomes n+1. Therefore, when the user attempts to read the next message by operating the switch  16  thereafter, the (m+1)-th message, which is the message #m which has been read immediately before the latest message, is displayed. 
     Therefore, even if the latest message is received while the user reads the messages, the latest message is displayed on the display section  8  so as to be distinguishable from other messages, under the control performed by the control section  4 . Since the latest message is displayed so that the user can clearly distinguish the latest message from other messages, the user can read the latest message without confusion with the messages received in the past. 
     Furthermore, when the user desires to read the message next to the latest message, the user can read the message #m which has been read immediately before the latest message. This eliminates the inconveniences of having to repeatedly read the messages which the user has read once. 
     In the description, the messages stored in the RAM  6  are all displayed on the display section  8 . However, when the message display instruction is inputted, a display number may inputted from the operation unit to the counter  17  at the same time. In this case, the control section  4  controls the display driver  7  to drive the display section  8  such that the message having the display number is first displayed and then the subsequent messages are displayed. 
     Also, the control section  4  may have a reception time register and timer (both not shown) instead of the counter  17 . In this case, when a message is received, the control section  4  stores the message in the RAM  6  together with a reception time. Also, the control section  4  reads the messages stored in the RAM  6  in order based on the reception times of the messages. When the message is displayed and read, the reception time the displayed message is held and next the message having the reception time most closest to the held reception time and older than the held reception time is displayed and read. 
     In this case, as in the above, a reference time may be set in the reception time register. The control section  4  controls the display driver  7  to drive the display section  8  such that the message having the reception time most closest to the reference reception time and older than the reference reception time is first displayed and then the subsequent messages are displayed. 
     As described above, according to the selective call radio apparatus with the message display function of the present invention, when the latest message is received during the display of the stored messages, the latest message is displayed so as to be distinguishable from the stored messages. This makes it possible for the user to understand that when the latest message is received and displayed, the displayed message is the latest one.