JP2002099886A5 - - Google Patents

Description

[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the configuration according to claim 1, when performing wireless communication with an external device, a wireless communication unit that operates by wireless power supplied from the external device, and the wireless communication unit a storage unit for storing various data associated with a display unit which performs various displays based on the data stored in the storage unit, and a power supply unit for supplying the display power to the display unit, the display on the display unit An operation unit for giving an instruction, and a power supply control unit for permitting the supply of the display power only for a predetermined period after the display instruction is issued are provided.

[0031]
In FIG. 2, when the switch 41 is operated by the user and the switch 41 is turned on, the activation circuit 42 operates.
The operation of the activation circuit 42 will be described in detail with reference to FIG. When the switch 41 is turned on, the gate terminal of the transistor N1 becomes high level, so that the transistor N1 is turned on. At this time, the potential Vb of the drain terminal of the transistor N1 is equal to the potential VSS of the source terminal, so that the potential of Vb drops to Vss (low level).
Therefore, the gate terminal of the transistor P1 goes low, so that the transistor P1 is turned on. Therefore, since the voltage Va of the voltage Vdd and the drain terminal of the source terminal of the transistor P1 is equal, power from the battery 50 to the integrated circuit 20 as a result will be supplied.

[0034]
As described above, the user of the non-contact IC card 100 according to the present embodiment can display the content stored in the non-contact IC card 100 on the display device 30 at any time. Therefore, even in the case of using the contactless IC card 100 for a train, it is possible to use the card after confirming the contents of the card in advance, and it becomes clear that the balance is insufficient only after passing through the ticket gate. It is possible to provide an easy-to-use non-contact IC card 100 in which such an inconvenient situation cannot occur.
Further, since it is made to include a display driving circuit 11 for driving a display equipment 30 in a non-contact card 100, there is no need to always to supply the power to the display driving circuit 11 from the battery 50, the battery 50 is small Even with capacity, there is no need for frequent battery replacement.

[0035]
B: Second Embodiment FIG. 4 is a block diagram showing a configuration of a non-contact IC card 200 according to the present embodiment. The non-contact IC card 200 is different from the non-contact IC card 100 according to the first embodiment in that the physical characteristics of the display device 230 and the point that the counter circuit 81 is provided in the control circuit 208 are different. In the following description, only the portions different from the above-described first embodiment will be described.

[0038]
Next, the counter circuit 81 will be described.
The counter circuit 81 is a circuit that outputs a timing signal at predetermined intervals. The length of this cycle can be arbitrarily changed by adjusting the circuit configuration of the counter circuit 81.
In the present embodiment, each time a timing signal is output from the counter circuit 81, the control circuit 208 controls the display drive circuit 211 to operate for tp (several tens of μsec). That is, the display drive circuit 211 is driven by the timing signal output from the counter circuit 81 as necessary to display one screen on the display device 230 .
The cycle of the counter circuit 81 is set to a time tp2 slightly shorter than the display holding period tw.

[0039]
FIG. 6 is a diagram for explaining the operation of the present embodiment. As shown in FIG. 6, once a display of one screen is performed on the display device 230, the display drive circuit 211 operates before a period during which the display is held (display holding period tw) elapses, and a new one is displayed. Since the display for one screen is performed, the display operation is always performed on the display device 230.
In addition, since the display driving circuit 211 only needs to be driven for a short period of time, power consumption can be suppressed to a very small value. Even if the battery 250 has a small capacity, the battery must be replaced frequently. A troublesome situation, such as no, cannot occur.

[0040]
In the present embodiment, the display on the display device 230 is performed not only when the timing signal is output from the counter circuit 81 but also when data communication with the read / write device 80 is performed. It may be good. By performing such control, even when the storage content of the non-contact IC card 200 changes, new content is always displayed on the display device 230.

[0041]
C: Third Embodiment FIG. 7 is a block diagram showing a configuration of a non-contact IC card 300 according to the present embodiment. The non-contact IC card 300 is different from the above-described non-contact IC card 100 in that a solar cell 350 is used instead of the battery 50 and that a voltage detection circuit 318 is provided in the control circuit 308. ing. Therefore, in the following description, only the portions different from the above-described embodiment will be described.

[0045]
As described above, when the solar cell 350 is irradiated with an amount of light equal to or more than a predetermined amount, the display driving circuit 311 operates and the display device 330 performs display. Therefore, by irradiating the solar cell 350 with light, the user can display and recognize the contents of the non-contact IC card 300 when desired.
The storage of the power for the capacitor C2 may be performed even when the IC card 300 is performing wireless communication with an external device (the read / write device 80 ). In this case, the wireless power supplied from the external device is stored in the capacitor C2 via the rectifier circuit in the integrated circuit 320. Then, it functions as a power supply source for the display drive circuit 311.

Claims (1)

When performing wireless communication with an external device, a wireless communication unit that operates with wireless power supplied from the external device,
A storage unit that stores various data associated with the wireless communication,
A display unit for performing various displays based on the data stored in the storage unit,
A power supply unit for supplying display power to the display unit;
An operation section for performing display instruction of the display unit,
A power supply control unit that permits supply of the display power only during a predetermined period after the display instruction is made;
A portable information processing device comprising:

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