IC card

[0068]FIG. 2 is a schematic block diagram of a hardware configuration of the IC card according to the The IC card 12 has an antenna 20, a liquid crystal display 21, a liquid crystal display control IC 22, a communication control IC 23, and a card control IC 24.

[0069] The antenna 20 and the communication control IC 23 correspond to the communication unit 13 shown in FIG. 1. The liquid crystal display 21 and the liquid crystal display control IC 22 correspond to the information display unit 15 shown in FIG. 15, and the card control IC 24 corresponds to the storage unit 14 and the controller 16 shown in FIG. 1.

[0070] The antenna 20 is a metal wire that emits radio waves to the air or receives radio waves from the air, at a time of communicating with the reader / writer 11. The liquid crystal display 21 displays data and messages in color. The liquid crystal display control IC 22 controls the liquid crystal display 21, to display data and messages in color.

[0071] The communication cont...

[0131] In the second embodiment, at least two cholesteric liquid crystal layers, respectively, reflecting light of a different wavelength in the planar state are arranged in parallel, for each of the segments 1401 to 1407 or 1411 to 1417 forming the data display pattern, the orientation of the cholesteric liquid crystals are changed by applying a voltage to the cholesteric liquid crystal layers arranged in parallel, so as to transmit or reflect light, thereby displaying predetermined information. Accordingly, the display color can be changed corresponding to the displayed data, to improve the convenience of the IC card. Furthermore, an IC card with a liquid crystal display capable of color display with high lightness can be manufactured at a low cost.

[0132] In the second embodiment, the parallel structure of the cholesteric liquid crystals is applied to the IC card with the liquid crystal display, however, the present invention is not limited thereto, and the similar technique can b...

[0157] the input receiving unit 176 that receives input of switching request for changing the display from the single data display to simultaneous multiple data display is provided. Upon reception of the input of a display switching request, the information display unit 175 switches the display from the single data display to simultaneous multiple data display. Accordingly, a plurality of data can be immediately confirmed, thereby improving the convenience of the IC card 220.

[0158] In the third embodiment, a case that single data display and two data display are switched by pressing the display switch button 222 has been explained. However, the present invention is not limited thereto, and switchover of display can be performed by rotating a rotary dial. By using the rotary dial instead of the display switch button 222, it can be prevented that the display switch button 222 is unexpectedly pressed, and unnecessary display is performed.

[0159] In this case, for example, when the rot...