Display device and portable terminal

• US 20060209060A1
• Filed: 03/14/2006
• Published: 09/21/2006
• Est. Priority Date: 03/17/2005
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Tanada, Yoshifumi, Yamazaki, Shunpei
• Granted Patent: US 7,659,892 B2
• Time in Patent Office: Days
• US Class Current: 345/211
• CPC Class Codes: G06F 3/147 using display panels
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2380/06 Remotely controlled electronic signs other than labels

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.

Claims

1. A portable terminal comprising:

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; and

a power source circuit for generating DC power for driving the display device by rectifying the AC power.

25. The portable terminal according to claim 1, further comprising a battery.

26. The portable terminal according to claim 1, further comprising a display portion.

2. A portable terminal comprising:

a display device for displaying images by controlling multiple pixels arranged in matrix; and

a battery for supplying a first DC power for driving a part of or the entire circuits that constitute the display device,

wherein the display device comprises 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, and

a power source circuit for generating a second DC power for driving a part of or the entire circuits that constitute the display device by rectifying the AC power

3. The portable terminal according to claim 2,

wherein the display device further comprises a selector circuit for selecting the first DC power or the second DC power;

wherein the selector circuit selects the first DC power when the resonant circuit is not in the resonant state; and

wherein the selector circuit selects the second DC power when the resonant circuit is in the resonant state.

4. The portable terminal according to claim 2, wherein the display device further comprises a source driver and a gate driver for controlling the multiple pixels.

5. The portable terminal according to claim 3, wherein the display device further comprises a source driver and a gate driver for controlling the multiple pixels.

6. The portable terminal according to claim 2, wherein the multiple pixels, the resonant circuit and the power source circuit are formed over the same insulating substrate.

7. The portable terminal according to claim 3, wherein the multiple pixels, the resonant circuit and the power source circuit are formed over the same insulating substrate.

8. The portable terminal according to claim 3, wherein the multiple pixels, the resonant circuit, the power source circuit and the selector circuit are formed over the same insulating substrate.

9. The portable terminal according to claim 4, wherein the multiple pixels, the resonant circuit, the power source circuit, the selector circuit, the source driver and the gate driver are formed over the same insulating substrate.

10. The portable terminal according to claim 5, wherein the multiple pixels, the resonant circuit, the power source circuit, the selector circuit, the source driver and the gate driver are formed over the same insulating substrate.

11. The portable terminal according to claim 2, wherein the multiple pixels and the power source circuit comprise thin film transistors, and are provided over an insulating substrate formed of glass or plastic.

12. The portable terminal according to claim 3, wherein the multiple pixels and the power source circuit comprise thin film transistors, and are provided over an insulating substrate formed of glass or plastic.

13. The portable terminal according to claim 3, wherein the multiple pixels, the power source circuit and the selector circuit comprise thin film transistors, and are provided over an insulating substrate formed of glass or plastic.

14. The portable terminal according to claim 4, wherein the multiple pixels, the power source circuit, the selector circuit, the source driver and the gate driver comprise thin film transistors, and are provided over an insulating substrate formed of glass or plastic.

15. The portable terminal according to claim 5, wherein the multiple pixels, the power source circuit, the selector circuit, the source driver and the gate driver comprise thin film transistors, and are provided over an insulating substrate formed of glass or plastic.

16. The portable terminal according to claim 2, wherein each of the multiple pixels comprises a liquid crystal element or a self-luminous element.

17. The portable terminal according to claim 3, wherein each of the multiple pixels comprises a liquid crystal element or a self-luminous element.

18. A display device comprising:

multiple pixels arranged in matrix;

a resonant circuit having a coil and a capacitor for inducing AC power by bringing the resonant circuit into a resonant state, the coil and the capacitor connected in parallel; and

a power source circuit for generating DC power for driving the display device by rectifying the AC power.

19. The display device according to claim 18, further comprising a source driver and a gate driver for controlling the multiple pixels.

20. The display device according to claim 18, wherein the multiple pixels, the resonant circuit and the power source circuit are formed over the same insulating substrate.

21. The display device according to claim 19, wherein the multiple pixels, the resonant circuit, the power source circuit, the source driver and the gate driver are formed over the same insulating substrate.

22. The display device according to claim 18, wherein the multiple pixels and the power source circuit comprise thin film transistors, and are provided over an insulating substrate formed of glass or plastic.

23. The display device according to claim 19, wherein the multiple pixels, the power source circuit, the source driver and the gate driver include thin film transistors, and are provided over an insulating substrate formed of glass or plastic.

24. The display device according to claim 18, wherein each of the multiple pixels comprises a liquid crystal element or a self-luminous element.