Display device and portable terminal
First Claim
1. A portable terminal comprising:
- a battery for supplying a first DC power;
a resonant circuit comprising a coil and a capacitor for inducing AC power by bringing the resonant circuit into a resonant state, the coil and the capacitor being connected in parallel;
a power source circuit for generating a second DC power by rectifying the AC power; and
a selector circuit for selecting the first DC power or the second DC power,wherein the selector circuit selects the first DC power when signals from a reader/writer are not detected and selects the second DC power when signals from the reader/writer are detected.
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Accused Products
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.
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Citations
11 Claims
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1. A portable terminal comprising:
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a battery for supplying a first DC power; a resonant circuit comprising a coil and a capacitor for inducing AC power by bringing the resonant circuit into a resonant state, the coil and the capacitor being connected in parallel; a power source circuit for generating a second DC power by rectifying the AC power; and a selector circuit for selecting the first DC power or the second DC power, wherein the selector circuit selects the first DC power when signals from a reader/writer are not detected and selects the second DC power when signals from the reader/writer are detected. - View Dependent Claims (2)
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3. A portable terminal comprising:
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a display device for displaying images by controlling multiple pixels arranged in matrix comprising a resonant circuit and a selector circuit; and a battery for supplying a first DC power, wherein the selector circuit selects the first DC power when signals from a reader/writer are not detected and selects a second DC power when signals from the reader/writer are detected, and wherein the resonant circuit comprises; a coil and a capacitor for inducing AC power by bringing the resonant circuit into a resonant state, the coil and the capacitor being connected in parallel, and a power source circuit for generating the second DC power by rectifying the AC power. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. A portable terminal comprising:
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a battery for supplying a first DC power; a resonant circuit comprising a coil and a capacitor for inducing AC power by bringing the resonant circuit into a resonant state, the coil and the capacitor being connected in parallel; a power source circuit for generating a second DC power by rectifying the AC power; and a selector circuit for selecting the first DC power or the second DC power. - View Dependent Claims (11)
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Specification