Semiconductor device and display device

• US 20060238135A1
• Filed: 03/29/2006
• Published: 10/26/2006
• Est. Priority Date: 04/20/2005
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kimura, Hajime
• Granted Patent: US 8,300,031 B2
• Time in Patent Office: Days
• US Class Current: 315/169.300
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2300/0847 being a dynamic memory without any storage capacitor, i.e. with use of parasitic capacitances as storage elements
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/0262 The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2330/04 Display protection
• CPC Class Codes: G09G 2330/08 Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/30 using electroluminescent panels
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

When a signal inputted to a pixel is erased by setting potentials of a gate terminal and a source terminal of a driving transistor to be equal, a current slightly flows through the driving transistor in some cases, which leads to occur a display defect. The invention provides a display device which improves the yield while suppressing the increase in manufacturing cost. When a potential of a scan line for erasure is raised, a potential of the gate terminal of the driving transistor is raised accordingly. For example, the scan line and the gate terminal of the driving transistor are connected through a rectifying element.

Claims

1. A semiconductor device comprising:

an electrode;

a current-voltage converter element;

a first transistor comprising;

a first terminal connected to a first wire;

a second terminal; and

a first gate terminal connected to a second wire;

a second transistor comprising;

a third terminal connected to a third wire;

a fourth terminal connected to the electrode; and

a second gate terminal connected to the second terminal; and

a third transistor comprising;

a fifth terminal connected to the second gate terminal;

a sixth terminal connected to a fourth wire through the current-voltage converter element; and

a third gate terminal connected to the fourth wire.

2. The semiconductor device according to claim 1,

wherein the current-voltage converter element comprises at least one of a resistor, a rectifying element, a transistor, and a diode-connected transistor.

3. The semiconductor device according to claim 2,

wherein the a rectifying element is any one of a PN junction diode, a PIN junction diode, and a Schottky diode.

4. The semiconductor device according to claim 1,

wherein the first transistor and the third transistor are N-channel transistors and the second transistor is a P-channel transistor.

5. The semiconductor device according to claim 1,

wherein the electrode is comprised in an electroluminescence element.

6. A display device comprising the semiconductor device according to claim1.

7. A electronic device comprising the display device according to claim 6, wherein the electronic device is one selected from the group consisting of a camera, a computer, a mobile computer, a portable image reproducing device provided with a recording medium, a goggle type display, a video camera and a portable phone.

8. A semiconductor device comprising:

an electrode;

a current-voltage converter element;

a capacitor element;

a first transistor comprising;

a first terminal connected to a first wire;

a second terminal; and

a first gate terminal connected to a second wire;

a second transistor comprising;

a third terminal connected to a third wire;

a fourth terminal connected to the electrode; and

a second gate terminal connected to the second terminal, and to the third wire through the capacitor element; and

a third transistor comprising;

a fifth terminal connected to the second gate terminal;

a sixth terminal connected to a fourth wire through the current-voltage converter element; and

a third gate terminal connected to the fourth wire.

9. The semiconductor device according to claim 8,

wherein the current-voltage converter element comprises at least one of a resistor, a rectifying element, a transistor, and a diode-connected transistor.

10. The semiconductor device according to claim 9,

wherein the a rectifying element is any one of a PN junction diode, a PIN junction diode, and a Schottky diode.

11. The semiconductor device according to claim 8,

wherein the first transistor and the third transistor are N-channel transistors and the second transistor is a P-channel transistor.

12. The semiconductor device according to claim 8,

wherein the electrode is comprised in an electroluminescence element.

13. A display device comprising the semiconductor device according to claim8.

14. A electronic device comprising the display device according to claim 13, wherein the electronic device is one selected from the group consisting of a camera, a computer, a mobile computer, a portable image reproducing device provided with a recording medium, a goggle type display, a video camera and a portable phone.

15. A semiconductor device comprising:

an electrode;

a current-voltage converter element;

a first transistor comprising;

a first terminal connected to a first wire;

a second terminal; and

a first gate terminal connected to a second wire;

a second transistor comprising;

a third terminal connected to a third wire;

a fourth terminal connected to the electrode; and

a second gate terminal connected to the second terminal; and

a third transistor comprising;

a fifth terminal connected to the second gate terminal;

a sixth terminal connected to a fourth wire through the current-voltage converter element; and

a third gate terminal connected to the fourth wire,

wherein the current-voltage converter element is a resistor.

16. The semiconductor device according to claim 15,

wherein the first transistor and the third transistor are N-channel transistors and the second transistor is a P-channel transistor.

17. The semiconductor device according to claim 15,

wherein the electrode is comprised in an electroluminescence element.

18. A display device comprising the semiconductor device according to claim 15.

19. A electronic device comprising the display device according to claim 18, wherein the electronic device is one selected from the group consisting of a camera, a computer, a mobile computer, a portable image reproducing device provided with a recording medium, a goggle type display, a video camera and a portable phone.

20. A semiconductor device comprising:

an electrode;

a current-voltage converter element;

a first transistor comprising;

a first terminal connected to a first wire;

a second terminal; and

a first gate terminal connected to a second wire;

a second transistor comprising;

a third terminal connected to a third wire;

a fourth terminal connected to the electrode; and

a second gate terminal connected to the second terminal; and

a third transistor comprising;

a fifth terminal connected to the second gate terminal;

a sixth terminal connected to a fourth wire through the current-voltage converter element; and

a third gate terminal connected to the fourth wire,

wherein the current-voltage converter element is a resistor, and

wherein the fifth terminal, the sixth terminal and the resistor are included in one island-shaped semiconductor layer.

21. The semiconductor device according to claim 20,

wherein the first transistor and the third transistor are N-channel transistors and the second transistor is a P-channel transistor.

22. The semiconductor device according to claim 20,

wherein the electrode is comprised in an electroluminescence element.

23. A display device comprising the semiconductor device according to claim 20.

24. A electronic device comprising the display device according to claim 23, wherein the electronic device is one selected from the group consisting of a camera, a computer, a mobile computer, a portable image reproducing device provided with a recording medium, a goggle type display, a video camera and a portable phone.

26. The semiconductor device according to claim 21,

wherein the a rectifying element is any one of a PN junction diode, a PIN junction diode, and a Schottky diode.

25. A semiconductor device comprising:

an electrode;

a current-voltage converter element;

a first transistor comprising;

a first terminal connected to a first wire;

a second terminal; and

a first gate terminal connected to a second wire;

a second transistor comprising;

a third terminal connected to a third wire;

a fourth terminal connected to the electrode; and

a second gate terminal connected to the second terminal; and

a third transistor comprising;

a fifth terminal connected-to the second gate terminal;

a sixth terminal connected to a fourth wire through the current-voltage converter element; and

a third gate terminal connected to the fourth wire,

wherein the current-voltage converter element is a rectifying element.

27. The semiconductor device according to claim 25,

wherein the first transistor and the third transistor are N-channel transistors and the second transistor is a P-channel transistor.

28. The semiconductor device according to claim 25,

wherein the electrode is comprised in an electroluminescence element.

29. A display device comprising the semiconductor device according to claim 25.

30. A electronic device comprising the display device according to claim 29, wherein the electronic device is one selected from the group consisting of a camera, a computer, a mobile computer, a portable image reproducing device provided with a recording medium, a goggle type display, a video camera and a portable phone.

31. A semiconductor device comprising:

an electrode;

a current-voltage converter element;

a first transistor comprising;

a first terminal connected to a first wire;

a second terminal; and

a first gate terminal connected to a second wire;

a second transistor comprising;

a third terminal connected to a third wire;

a fourth terminal connected to the electrode; and

a second gate terminal connected to the second terminal; and

a third transistor comprising;

a fifth terminal connected to the second gate terminal;

a sixth terminal connected to a fourth wire through the current-voltage converter element; and

a third gate terminal connected to the fourth wire,

wherein the current-voltage converter element is PN junction diode having a first doped region and a second doped region,

wherein the fifth terminal, the sixth terminal, the first doped region and the second doped region are included in one island-shaped semiconductor layer,

wherein the fifth terminal, the sixth terminal and the first doped region comprise a first dopant, and

wherein the second doped region comprises a second dopant.

32. The semiconductor device according to claim 31,

wherein the first transistor and the third transistor are N-channel transistors and the second transistor is a P-channel transistor.

33. The semiconductor device according to claim 31,

wherein the electrode is comprised in an electroluminescence element.

34. A display device comprising the semiconductor device according to claim 31.

35. A electronic device comprising the display device according to claim 34, wherein the electronic device is one selected from the group consisting of a camera, a computer, a mobile computer, a portable image reproducing device provided with a recording medium, a goggle type display, a video camera and a portable phone.