Radio message display system

A radio message display system for transmitting a message entered on an input device over a radio link which is set up by a paging transmitter and a paging receiver, the message being displayed on a display panel. A transmit side is provided with an encoder for coding the message entered on the input device, and the paging transmitter adapted to modulate a carrier by the coded message and transmitting the modulated carrier. A receive side, on the other hand, is provided with the display panel in which the paging receiver is accommodated for receiving and demodulating the carrier. The receiver may display the message on a display section thereof or deliver it to an external output terminal thereof. The display panel supplied with the message via the output terminal of the receiver displays it on another display section.

BACKGROUND OF THE INVENTION 
The present invention relates to a message display system for displaying on 
a display panel an entered message and, more particularly, to a radio 
message display system for displaying a message on a display panel by 
transmitting it over a radio link which is established by a paging 
transmitter and a paging receiver. 
Two different systems have heretofore been available to display messages in 
alphanumeric and other characters and graphics, i.e., a system in which a 
message entered on an input device is transmitted by wire to a display 
panel, and a system in which messages are stored in an exclusive data 
storage built in a display panel and selectively read therefrom. Both of 
the wired connection type scheme and the built-in storage type scheme, 
have drawbacks in that the installation, layout modification and other 
tasks require troublesome work, and that the contents to be displayed 
cannot be changed. 
SUMMARY OF THE INVENTION 
It is therefore an object of the present invention to provide a radio 
message display system in which a display panel for displaying messages 
can be installed and modified in layout with ease. 
It is another object of the present invention to provide a radio message 
display system in which messages to be displayed on a display panel can be 
changed easily. 
It is another object of the present invention to provide a generally 
improved radio message display system. 
A radio message display system for displaying a message entered by 
transmitting the message over a radio link of the present invention 
comprises an input device for entering a message, an encoder for coding an 
output of the input device, a paging transmitter for modulating a carrier 
by an output of the encoder and transmitting the carrier modulated as a 
radio carrier, a paging receiver for receiving and demodulating the radio 
carrier to produce the message, the message being displayed on a display 
of the receiver or delivered to an external output terminal of the 
receiver, and a display panel having a display section for displaying the 
message which is outputted via the external output terminal of the 
receiver, the receiver being accommodated in the display panel. 
The above and other objects, features and advantages of the present 
invention will become more apparent from the following detailed 
description taken with the accompanying drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIG. 1 of the drawings, a radio message display system 
embodying the present invention is shown. In this particular embodiment, a 
message inputted on an input device 1 is coded by an encoder 2 and then 
fed to a paging transmitter 3. The transmitter 3 modulates a carrier by 
the coded information and transmits the modulated carrier as an 
electromagnetic wave. On the other hand, a paging receiver 4 which is 
installed in a a generally T-shaped display panel 5 receives and 
demodulates the radio carrier transmitted and delivers it to the display 
panel 5 via an external output terminal 41 thereof. As a result, the 
message entered on the input device 1 is displayed on a display 51 of the 
display panel 5. 
FIG. 2 shows the input device 1, encoder 2 and transmitter 3 in a system 
block diagram. As a person manipulates an operating section 11 of the 
input device 1 to enter a desired message, the message is displayed on a 
display section 12 of the device 1 and, at the same time, applied to a 
control section 21 of the encoder 2. In response, the encoder 2 converts 
the message into a message signal having a particular signal format which 
will be described. The message signal is fed to a modulating section 31 of 
the transmitter 3 so as to modulate a subcarrier. The subcarrier modulated 
is applied to a transmitting section 32 of the transmitter 3 to modulate a 
carrier. The output of the section 32 is transmitted as an electromagnetic 
wave via an antenna 33. 
Referring to FIG. 3, the display panel 5 and the paging receiver 4 which is 
accommodated in the display panel 5 are shown in a block diagram. An 
antenna 42 is installed in the receiver 4 to receive the electromagnetic 
wave which is sent from the transmitter 3. The electromagnetic wave 
received is fed as a carrier to a receiving section 43 of the receiver 4. 
The receiving section 43 demodulates the input carrier to produce a 
subcarrier which is then applied to a demodulating section 44. This 
section 44 further demodulates the subcarrier to convert it into logical 
data the format of which is described below (see FIG. 4), the logical data 
being routed to a control section 45. In response, the control section 45 
determines whether the data matches with a particular address number which 
is stored in a read only memory (ROM) 46 and, if matched, produces an 
alert tone through a speaker 47 while displaying the content of the 
message on a displaying section 48. 
Where the receiver 4 is mounted in the display panel 5, the signal from the 
control section 45 of the receiver 4 is applied to a storage control 
section 53 of the display panel 5 via the external output terminal 41 of 
the receiver 4 and an input terminal 52 of the display panel 5. The 
storage control section 53 transforms the logical data into dot data by 
means of a character generator 54 and supplies a display control section 
55 with the dot data to be displayed, whereby the message is displayed 
simultaneously on the displaying section 48 and on the display section 51. 
The display section 51 of the display panel 5 may be implemented with a 16 
by 16 dots display by way of example. Controlled by the control section 
55, the display section 51 displays thereon messages in alphanumeric and 
other characters, graphics and others. 
Referring to FIG. 4, the message signal format is shown to consist of a BIT 
SYNC area, a FRAME SYNC area, an ADDRESS area, a COMMAND area, a DATA 
area, and an ERROR CORRECTION CODE area. The BIT SYNC area is 
representative of a signal for synchronizing a demodulator while the FRAME 
SYNC area is adapted to synchronize a frame and indicate that necessary 
data follows it. The ADDRESS area is representative of an address number 
assigned to an individual paging receiver and used to call a particular 
receiver. The COMMAND area is adapted to control a display mode and 
others; the display mode may be either a still display mode or a running 
display mode. The DATA area contains data to be displayed. As regards 
kanas (Japanese syllabary) and kanjis (Chinese characters), for example, 
character addresses as specified by JIS (Japanese Industrial Standards) C 
6226 correspond to the DATA area. Further, the ERROR CORRECTION CODE area 
contains a self-correction code which may be the check bit of Bose 
Chaudkuri Hocquenghem (BCH) code. 
Referring to FIG. 5, there is shown the receiver 4 which is mounted in a 
casing 56 of the display panel 5. As shown, the receiver 4 is fastened by 
a rubber strip 6 to a connector box 7 which is built in the casing 56. 
Installed in the connector box 7 is the input terminal 52 of the display 
panel 5 which is connected to the output terminal 41 of the receiver 4, as 
shown in FIG. 3. 
In FIG. 3, it is to be noted that each of the connecting lines and 
terminals is representative of a plurality of connecting lines or 
terminals adapted for data, clock and others. 
In summary, it will be seen that the present invention provides a radio 
message display system which achieves a message display function with a 
display panel in addition to a call message display function which is 
particular to a paging receiver. Such a capability is derived from a radio 
link which is established by a paging receiver and a paging transmitter 
between an encoder of a transmit side and a display panel of a receive 
side. In accordance with the present invention, therefore, the display 
panel can be installed and changed in layout with ease and, moreover, the 
contents to be displayed can be modified easily. 
Various modifications will become possible for those skilled in the art 
after receiving the teachings of the present disclosure without departing 
from the scope thereof.