Display device and portable terminal

Abstract

In order to increase the continuous operating time of a display device driven by a battery or the like, and a portable information terminal using the same, the volume and weight of the battery are increased. Thus, there arises a trade-off between the increased capacity of the battery and the portability of the device/terminal. Therefore, the invention provides a display device with portability ensured, which is capable of operating continuously for long periods and a portable information terminal using the same. In the display device, TFTs and an RFID tag are formed over the same insulating substrate. The RFID tag detects signals from a reader/writer, and generates DC power based on the signals. While the RFID tag is detecting signals, the display device is driven by the DC power generated in the RFID tag.

1 . A receiver comprising:
 a device   a battery configured to supply electrical power to the device;   an antenna;   a power source circuit configured to generate electrical power from a signal received by the antenna; and   a selector circuit configured to electrically connect one of the battery and the power source circuit to the device,   wherein the receiver is provided with an identification number that can be read out by a reader/writer.   
     
     
         2 . The receiver according to  claim 1 ,
 wherein an RFID tag comprised in the receiver is assigned with the identification number.   
     
     
         3 . The receiver according to  claim 1 ,
 wherein the antenna is constructed of a resonant circuit comprising a coil and a capacitor connected in parallel;   wherein the selector circuit is configured to electrically connect the device to the power source circuit when the resonant circuit is in a resonant state.   
     
     
         4 . The receiver according to  claim 1 ,
 wherein the device is a display device.   
     
     
         5 . The receiver according to  claim 1 ,
 wherein the antenna is constructed of a resonant circuit comprising a coil and a capacitor connected in parallel;   wherein the coil, the capacitor, the power source circuit and the selector circuit are included in the RFID tag.   
     
     
         6 . The receiver according to  claim 1 ,
 wherein the receiver is configured to receive data from a portable terminal.   
     
     
         7 . The receiver according to  claim 1 ,
 wherein the battery is configured to output a first direct current power; and   wherein the power source circuit is configured to output a second direct current power.   
     
     
         8 . A receiver comprising:
 a device;   a battery configured to supply electrical power to the device;   an antenna;   a power source circuit configured to generate electrical power from a signal received by the antenna; and   a selector circuit configured to electrically connect one of the battery and the power source circuit to the device,   wherein the receiver is provided with an identification number that can be read out by a reader/writer; and   wherein the receiver is configured to receive data in accordance with the identification number.   
     
     
         9 . The receiver according to  claim 8 ,
 wherein an RFID tag comprised in the receiver is assigned with the identification number.   
     
     
         10 . The receiver according to  claim 8 ,
 wherein the antenna is constructed of a resonant circuit comprising a coil and a capacitor connected in parallel;   wherein the selector circuit is configured to electrically connect the device to the power source circuit when the resonant circuit is in a resonant state.   
     
     
         11 . The receiver according to  claim 8 ,
 wherein the device is a display device.   
     
     
         12 . The receiver according to  claim 8 ,
 wherein the antenna is constructed of a resonant circuit comprising a coil and a capacitor connected in parallel;   wherein the coil, the capacitor, the power source circuit and the selector circuit are included in the RFID tag.   
     
     
         13 . The receiver according to  claim 8 ,
 wherein the receiver is configured to receive data from a portable terminal.   
     
     
         14 . The receiver according to  claim 8 ,
 wherein the battery is configured to output a first direct current power; and   wherein the power source circuit is configured to output a second direct current power.   
     
     
         15 . A receiver comprising:
 a device;   a battery configured to supply electrical power to the device;   an antenna;   a power source circuit configured to generate electrical power from a signal received by the antenna; and   a selector circuit configured to electrically connect one of the battery and the power source circuit to the device,   wherein the receiver is provided with an identification number that be sent to reader/writer; and   wherein the receiver is configured to receive data in accordance with the identification number.   
     
     
         16 . The receiver according to  claim 15 ,
 wherein an RFID tag comprised in the receiver is assigned with the identification number.   
     
     
         17 . The receiver according to  claim 15 ,
 wherein the antenna is constructed of a resonant circuit comprising a coil and a capacitor connected in parallel;   wherein the selector circuit is configured to electrically connect the device to the power source circuit when the resonant circuit is in a resonant state.   
     
     
         18 . The receiver according to  claim 15 ,
 wherein the device is a display device.   
     
     
         19 . The receiver according to  claim 15 ,
 wherein the antenna is constructed of a resonant circuit comprising a coil and a capacitor connected in parallel;   wherein the coil, the capacitor, the power source circuit and the selector circuit are included in the RFID tag.   
     
     
         20 . The receiver according to  claim 15 ,
 wherein the receiver is configured to receive data from a portable terminal.   
     
     
         21 . The receiver according to  claim 15 ,
 wherein the battery is configured to output a first direct current power; and   wherein the power source circuit is configured to output a second direct current power.