Audio signal processing circuit and a display device incorporating the same

• US 20040201056A1
• Filed: 04/12/2004
• Published: 10/14/2004
• Est. Priority Date: 04/14/2003
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.), Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.), Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Miyata, Kazuhiko, Miyake, Hiroyuki, Takahashi, Kei, Koyama, Jun
• Granted Patent: US 7,769,190 B2
• Time in Patent Office: Days
• US Class Current: 257/303
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: H01C 7/006 Thin film resistors
• CPC Class Codes: H01G 4/40 Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/10136 Liquid Crystal display [LCD]
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits

Abstract

An audio signal processing circuit for processing an audio signal which is compact and small is provided. For the audio signal processing circuit of the invention, an input circuit, a feedback circuit, and a smoothing circuit are formed using a chip capacitor with small mounting space and a thin film resistor on an insulating substrate. Accordingly, the audio signal processing circuit that is small and further a display device incorporating the audio signal processing circuit are provided.

Claims

1. An audio signal processing circuit comprising:

a thin film element formed over an insulating substrate;

a thin film resistor formed over the insulating substrate; and

a chip capacitor mounted over the insulating substrate.

2. The audio signal processing circuit according to claim 1, wherein the audio signal processing circuit comprises an input circuit and the input circuit comprises thin film resistor and the chip capacitor.

3. The audio signal processing circuit according to claim 1, wherein the audio signal processing circuit comprises a feedback circuit and the feedback circuit comprises thin film resistor and the chip capacitor.

4. The audio signal processing circuit according to claim 1, wherein the audio signal processing circuit comprises a smoothing circuit and the smoothing circuit comprises thin film resistor and the chip capacitor.

5. The audio signal processing circuit according to claim 1, wherein P-type impurities are doped in the thin film resistor.

6. The audio signal processing circuit according to claim 1, wherein the thin film resistor has a resistance value of 80 kΩ

or more.

7. An electronic equipment comprising the audio signal processing circuit according to claim 1, wherein the electronic equipment is one selected from the group consisting of a video camera, a digital camera, a head mounted display, a game machine, a car navigation system, a personal computer and a portable information terminal.

8. An audio signal processing circuit comprising:

a thin film element formed over an insulating substrate;

a thin film resistor formed over the insulating substrate; and

a chip capacitor mounted over a flexible substrate connected to the insulating substrate.

9. The audio signal processing circuit according to claim 8, wherein the audio signal processing circuit comprises an input circuit and the input circuit comprises thin film resistor and the chip capacitor.

10. The audio signal processing circuit according to claim 8, wherein the audio signal processing circuit comprises a feedback circuit and the feedback circuit comprises thin film resistor and the chip capacitor.

11. The audio signal processing circuit according to claim 8, wherein the audio signal processing circuit comprises a smoothing circuit and the smoothing circuit comprises thin film resistor and the chip capacitor.

12. The audio signal processing circuit according to claim 8, wherein P-type impurities are doped in the thin film resistor.

13. The audio signal processing circuit according to claim 8, wherein the thin film resistor has a resistance value of 80 kΩ

or more.

14. An electronic equipment comprising the audio signal processing circuit according to claim 8, wherein the electronic equipment is one selected from the group consisting of a video camera, a digital camera, a head mounted display, a game machine, a car navigation system, a personal computer and a portable information terminal.

15. An audio signal processing circuit comprising:

a thin film element formed over an insulating substrate;

a thin film resistor formed over the insulating substrate; and

a chip capacitor mounted over a printed circuit board electrically connected to the insulating substrate.

16. The audio signal processing circuit according to claim 15, wherein the audio signal processing circuit comprises an input circuit and the input circuit comprises thin film resistor and the chip capacitor.

17. The audio signal processing circuit according to claim 15, wherein the audio signal processing circuit comprises a feedback circuit and the feedback circuit comprises thin film resistor and the chip capacitor.

18. The audio signal processing circuit according to claim 15, wherein the audio signal processing circuit comprises a smoothing circuit and the smoothing circuit comprises thin film resistor and the chip capacitor.

19. The audio signal processing circuit according to claim 15, wherein P-type impurities are doped in the thin film resistor.

20. The audio signal processing circuit according to claim 15, wherein the thin film resistor has a resistance value of 80 kΩ

or more.

21. An electronic equipment comprising the audio signal processing circuit according to claim 15, wherein the electronic equipment is one selected from the group consisting of a video camera, a digital camera, a head mounted display, a game machine, a car navigation system, a personal computer and a portable information terminal.

22. A display device comprising:

a thin film element formed over an insulating substrate;

a thin film resistor formed over the insulating substrate; and

a chip capacitor mounted over the insulating substrate.

23. The display device according to claim 22, wherein the display device comprises an input circuit and the input circuit comprises thin film resistor and the chip capacitor.

24. The display device according to claim 22, wherein the display device comprises a feedback circuit and the feedback circuit comprises thin film resistor and the chip capacitor.

25. The display device according to claim 22, wherein the display device comprises a smoothing circuit and the smoothing circuit comprises thin film resistor and the chip capacitor.

26. The display device according to claim 22, wherein P-type impurities are doped in the thin film resistor.

27. The display device according to claim 22, wherein the thin film resistor has a resistance value of 80 kΩ

or more.

28. An electronic equipment comprising the display device according to claim 22, wherein the electronic equipment is one selected from the group consisting of a video camera, a digital camera, a head mounted display, a game machine, a car navigation system, a personal computer and a portable information terminal.

29. A display device comprising:

a thin film element formed over an insulating substrate;

a thin film resistor formed over the insulating substrate; and

a chip capacitor mounted over a flexible substrate connected to the insulating substrate.

30. The display device according to claim 29, wherein the display device comprises an input circuit and the input circuit comprises thin film resistor and the chip capacitor.

31. The display device according to claim 29, wherein the display device comprises a feedback circuit and the feedback circuit comprises thin film resistor and the chip capacitor.

32. The display device according to claim 29, wherein the display device comprises a smoothing circuit and the smoothing circuit comprises thin film resistor and the chip capacitor.

33. The display device according to claim 29, wherein P-type impurities are doped in the thin film resistor.

34. The display device according to claim 29, wherein the thin film resistor has a resistance value of 80 kΩ

or more.

35. An electronic equipment comprising the display device according to claim 29, wherein the electronic equipment is one selected from the group consisting of a video camera, a digital camera, a head mounted display, a game machine, a car navigation system, a personal computer and a portable information terminal.

36. A display device comprising:

a thin film element formed over an insulating substrate;

a thin film resistor formed over the insulating substrate; and

a chip capacitor mounted over a printed circuit board electrically connected to the insulating substrate.

37. The display device according to claim 36, wherein the display device comprises an input circuit and the input circuit comprises thin film resistor and the chip capacitor.

38. The display device according to claim 36, wherein the display device comprises a feedback circuit and the feedback circuit comprises thin film resistor and the chip capacitor.

39. The display device according to claim 36, wherein the display device comprises a smoothing circuit and the smoothing circuit comprises thin film resistor and the chip capacitor.

40. The display device according to claim 36, wherein P-type impurities are doped in the thin film resistor.

41. The display device according to claim 36, wherein the thin film resistor has a resistance value of 80 kΩ

or more.

42. An electronic equipment comprising the display device according to claim 36, wherein the electronic equipment is one selected from the group consisting of a video camera, a digital camera, a head mounted display, a game machine, a car navigation system, a personal computer and a portable information terminal.