Source: http://www.google.ca/patents/US20030132930
Timestamp: 2018-01-16 23:39:26
Document Index: 126574574

Matched Legal Cases: ['art 3003', 'art 3004', 'art 3003', 'art 3102', 'art 3103', 'art 3102', 'art 3203', 'art 3203', 'art 3302', 'art 3302', 'art 3405', 'art 3407', 'art 3502', 'art 3503', 'art 3502', 'art 3602', 'art 3605', 'art 3606', 'art 3608', 'art 3602', 'art 3703', 'art 3704', 'art 3705', 'art 3703', 'art 3703']

Patent US20030132930 - Electric circuit - Google Patents
The transistor suffers the variation caused in threshold voltage or mobility due to gathering of the factors of the variation in gate insulator film resulting from a difference in manufacture process or substrate used and of the variation in channel-region crystal state. The present invention provides...http://www.google.ca/patents/US20030132930?utm_source=gb-gplus-sharePatent US20030132930 - Electric circuit
Publication number US20030132930 A1
Also published as CN1433144A, CN100377494C, EP1330022A2, EP1330022A3, EP1330022B1, EP2259268A2, EP2259268A3, US7123250, US7710166, US8149043, US8253446, US8669791, US8928362, US20060290692, US20100164599, US20120139440, US20120306838, US20140152387
Publication number 10345178, 345178, US 2003/0132930 A1, US 2003/132930 A1, US 20030132930 A1, US 20030132930A1, US 2003132930 A1, US 2003132930A1, US-A1-20030132930, US-A1-2003132930, US2003/0132930A1, US2003/132930A1, US20030132930 A1, US20030132930A1, US2003132930 A1, US2003132930A1
US 20030132930 A1
1. An electric circuit for outputting an output potential at an output terminal on the basis of an input potential inputted at an input terminal, the electric circuit comprising:
a capacitance element for converting a current supplied from a constant current source into a voltage;
a transistor for supplying a current dependent upon a converted voltage;
a first switch connected between the input terminal and a gate electrode of the transistor; and
a second switch connected between a source electrode of the transistor and the output terminal,
whereby the capacitance element is connected between a gate and a source of the transistor.
2. An electric circuit according to claim 1, wherein the input voltage is a potential of a signal supplied from a photoelectric converter element.
3. An electric circuit according to claim 1, wherein an amount of a current flowing at between the source and the drain of the transistor is the same as an amount of a current to be supplied from the constant current source.
4. An electric circuit according to claim 1, wherein the electric circuit is configured with one selected from a source-follower circuit, a differential amplifier, an operational amplifier and an amplifier circuit.
5. An electric circuit for outputting an output potential at an output terminal on the basis of an input potential inputted at an input terminal, the electric circuit comprising:
first and second capacitance elements for converting a current supplied from a constant current source into a voltage;
first and second transistors for supplying a current dependent upon a converted voltage and connected in series;
whereby the first capacitance element is connected between a gate and a source of the first transistor and second capacitance element is connected between a gate and a source of the second transistor.
6. An electric circuit according to claim 5, wherein the input voltage is a potential of a signal supplied from a photoelectric converter element.
7. An electric circuit according to claim 5, wherein an amount of a current flowing at between the source and the drain of the first and second transistors is the same as an amount of a current to be supplied from the constant current source.
8. An electric circuit according to claim 5, wherein the first and second transistors are of a same conductor type.
9. An electric circuit according to claim 5, wherein the electric circuit is configured with one selected from a source-follower circuit, a differential amplifier, an operational amplifier and an amplifier circuit.
10. An electric circuit for outputting an output potential at an output terminal on the basis of an input potential inputted at an input terminal, the electric circuit comprising:
a capacitance element for converting into a voltage a current, caused by inputting a bias potential to a gate electrode of the second transistor, flowing at between the first and second power lines;
whereby a current flows at between a source and a drain of the first transistor, in an amount dependent upon a charge held between both electrodes of the capacitance element.
11. An electric circuit according to claim 10, wherein the input voltage is a potential of a signal supplied from a photoelectric converter element.
12. An electric circuit according to claim 10, wherein the first and second transistors are of a same conductor type.
13. An electric circuit according to claim 10, wherein the electric circuit is configured with one selected from a source-follower circuit, a differential amplifier, an operational amplifier and an amplifier circuit.
15. A display device according to claim 14, wherein the input voltage is a potential of a signal supplied from a photoelectric converter element.
16. A display device according to claim 14, wherein an amount of a current flowing at between the source and the drain of the transistor is the same as an amount of a current to be supplied from the constant current source.
17. A display device according to claim 14 wherein the driving circuit according is configured with one selected from a source-follower circuit, a differential amplifier, an operational amplifier and an amplifier circuit.
18. A display device according to claim 14 wherein the display device is incorporated into an electronic apparatus selected from the group consisting of a video camera, a digital camera, a goggle-type display, a navigation system, an audio reproducing apparatus, a notebook personal computer, a game apparatus, a personal digital assistant and an image reproducing apparatus.
20. A display device according to claim 19, wherein the input voltage is a potential of a signal supplied from a photoelectric converter element.
21. A display device according to claim 19, wherein an amount of a current flowing at between the source and the drain of the first and second transistors is the same as an amount of a current to be supplied from the constant current source.
22. A display device according to claim 19, wherein the first and second transistors are of a same conductor type.
23. A display device according to claim 19, wherein the driving circuit is configured with one selected from a source-follower circuit, a differential amplifier, an operational amplifier and an amplifier circuit.
24. A display device according to claim 19, wherein the display device is incorporated into an electronic apparatus selected from the group consisting of a video camera, a digital camera, a goggle-type display, a navigation system, an audio reproducing apparatus, a notebook personal computer, a game apparatus, a personal digital assistant and an image reproducing apparatus.
26. A display device according to claim 25, wherein the input voltage is a potential of a signal supplied from a photoelectric converter element.
27. A display device according to claim 25, wherein the first and second transistors are of a same conductor type.
28. A display device according to claim 25, wherein the driving circuit is configured with one selected from a source-follower circuit, a differential amplifier, an operational amplifier and an amplifier circuit.
29. A display device according to claim 25 wherein the display device is incorporated into an electronic apparatus selected from the group consisting of a video camera, a digital camera, a goggle-type display, a navigation system, an audio reproducing apparatus, a notebook personal computer, a game apparatus, a personal digital assistant and an image reproducing apparatus.
[0051]FIG. 1 is a diagram explaining the operation of a source-follower circuit of the present invention;
[0052]FIGS. 2A and 2B are diagrams explaining the operation of the source-follower circuit of the invention;
[0053]FIGS. 3A to 3D are diagrams explaining the configuration and operation of an electric circuit of the invention;
[0054]FIGS. 4A to 4H are figures of electronic apparatus to which the invention is to be applied;
[0055]FIGS. 5A to 5C are diagrams explaining the operation of the source follower circuit;
[0056]FIGS. 6A and 6B are diagrams explaining the operation of the source follower circuit;
[0057]FIGS. 7A and 7B are diagrams showing a source-follower circuit of the invention;
[0058]FIGS. 8A and 8B are diagrams showing a source-follower circuit of the invention;
[0059]FIG. 9 is a diagram showing a source-follower circuit of the invention;
[0060]FIG. 10 is a diagram showing a differential amplifier circuit of the invention;
[0061]FIG. 11 is a diagram showing a differential amplifier circuit of the invention;
[0062]FIGS. 12A and 12B are diagrams showing an operational amplifier of the invention;
[0063]FIGS. 13A and 13B are diagrams showing an operational amplifier of the invention;
[0064]FIGS. 14A to 14C are diagrams showing a semiconductor device of the invention;
[0065]FIG. 15 is a diagram showing a pixel and bias circuit of the semiconductor device of the invention;
[0066]FIGS. 16A and 16B are diagrams explaining the configuration of the electric circuit of the invention;
[0067]FIG. 17 is a diagram of a signal-line drive circuit of the invention;
[0068]FIG. 18 is a diagram of the signal-line drive circuit of the invention;
[0069]FIG. 19 is a diagram explaining the operation of the signal-line drive circuit of the invention;
[0070]FIGS. 20A and 20B are diagrams showing a reference constant-current source;
[0071]FIGS. 21A to 21F are diagrams showing a reference constant-current source;
[0072]FIGS. 22A to 22E are diagrams showing a reference constant-current source;
[0073]FIGS. 23A and 23B are diagrams showing a reference constant-current source;
[0074]FIG. 24 is a diagram showing a source-follower circuit of the invention;
[0075]FIGS. 25A and 25B are diagrams showing a source-follower circuit of the invention;
[0076]FIGS. 26A an 26B are diagrams showing a source-follower circuit of the invention;
[0077]FIG. 27 is a diagram showing a source-follower circuit of the invention;
[0078]FIGS. 28A and 28B are diagrams showing a source-follower circuit of the invention;
[0079]FIG. 29 is a diagram showing a source-follower circuit of the invention;
[0080]FIG. 30 is a diagram showing a differential amplifier circuit of the invention;
[0081]FIG. 31 is a diagram showing a differential amplifier circuit of the invention;
[0082]FIG. 32 is a diagram showing a differential amplifier circuit of the invention;
[0083]FIG. 33 is a diagram showing a differential amplifier circuit of the invention;
[0084]FIG. 34 is a diagram showing a differential amplifier circuit of the invention;
[0085]FIG. 35 is a diagram showing a differential amplifier circuit of the invention;
[0086]FIG. 36 is a diagram showing a differential amplifier circuit of the invention;
[0087]FIG. 37 is a diagram showing a differential amplifier circuit of the invention;
[0088]FIGS. 38A and 38B are diagrams showing an operational amplifier of the invention;
[0089]FIGS. 39A and 39B are diagrams showing an operational amplifier of the invention;
[0090]FIG. 40 is a diagram of a signal-line drive circuit of the invention;
[0091]FIG. 41 is a diagram of a signal-line drive circuit of the invention; and
[0092]FIG. 42 is a diagram explaining the operation of the signal-line drive circuit of the invention.
In FIGS. 1, 2A and 2B, 111 is an n-channel amplifier transistor, and 112 is an n-channel bias transistor. 113 and 114 are capacitance elements. Meanwhile, 115-118, 120, 127, 128 are elements having switching functions, which preferably use semiconductor elements, such as analog switches, configured by transistors. In this case, the semiconductor devices are merely switches and hence not especially limited in their polarities. 126 is a reference constant-current source having a capability to flow a constant current. The reference constant-current source 126 is configured by a semiconductor element of a transistor or the like. In the present specification, a reference constant-current source 126 configured by transistor will be explained in its one example in Embodiment 6. This can be made reference to conveniently.
[0097]123-125 are power lines, i.e. the power line 123 is applied with a power source potential Vdd1 while the power line 124 is with a ground potential Vss. The power line 125 is applied with a power source potential Vdd2. The power source potential Vdd1 applied to the power line 123 and the power source potential Vdd2 applied to the power line 125 may be the same or different in value. However, the power source potential Vdd2 applied to the power line 125 is required to be set at a value that the reference constant-current source 126 is allowed to normally operate as a constant-current source. For example, where the reference constant-current source 126 utilizes a saturation region of a transistor to configure the current source, there is a need to set at a value in a range the transistor is allowed to operate in the saturation region.
In FIG. 9, 131 is a p-channel bias transistor while 132 is a p-channel amplifier transistor. 133 and 134 are capacitance elements. Meanwhile, 135, 136, 138-142 are elements having switching functions, which preferably use semiconductor elements, such as analog switches, configured by transistors. 146 is a reference constant-current source having a capability to flow a constant current. The reference constant-current source 146 is configured by a semiconductor element, such as a transistor. In the present specification, the reference constant-current source 146 configured by a transistor will be explained in its one example in Embodiment 6. This can be made reference to conveniently. 143-145 are power lines. The power line 143 is applied with a power-source potential Vdd1 while the power line 144 is applied with a ground potential Vss. The power line 145 is applied with a power source potential Vdd2. Incidentally, the power source potential Vdd1 applied to the power line 143 and the power source voltage Vdd2 applied to the power line 145 may be the same or different in value. However, the power source potential Vdd2 applied to the power line 145 is required to be set at a value that the reference constant-current source 146 is allowed to normally operate as a constant-current source. For example, where the reference constant-current source 146 utilizes a saturation region of a transistor to configure the current source, there is a need to set at a value that the transistor is allowed to operate in the saturation region.
[0156]FIG. 8B shows a source-follower circuit in a case not provided with the bias transistor 131, the capacitance element 133 and the switch 135. The operation of the source-follower circuit of FIG. 8B is similar to the foregoing operation of FIGS. 1, 2A and 2B in Embodiment 1, and hence omittedly explained in this embodiment.
[0165]268 is a reference constant-current source having a capability to flow a constant current. The reference constant-current source 268 is configured by a semiconductor element, such as a transistor. In the present specification, the reference constant-current source 268 configured by a transistor will be explained in its one example in Embodiment 6. This can be made reference to conveniently.
[0166]267, 271 and 291 are power lines. The power line 271 is applied with a power source potential Vdd1 while the power line 291 is with a ground potential Vss. The power line 267 is applied with a power source potential Vdd2. The power source potential Vdd1 applied to the power line 271 and the power source potential Vdd2 applied to the power line 267 may be the same or different in value. However, the power source potential Vdd2 applied to the power line 267 is required to be set at a value that the reference constant-current source 268 is allowed to normally operate as a constant-current source. For example, where the reference constant-current source 268 utilizes a saturation region of a transistor to configure the current source, there is a need to set at a value that the transistor is allowed to operate in the saturation region.
[0176]FIG. 10 used a current supplied, as a current during a setting operation, from the current source 268. In FIG. 31, a setting operation is made by using the transistor 286. The transistor 286 operates as a current source, which determines a magnitude of current depending upon a bias voltage Vb applied to the gate thereof.
Consequently, FIG. 35 shows a diagram in a case that a transistor 506 is arranged parallel with the transistor 286 as another method for obtaining the similar effect. The transistor 506 is desirably in a size made the same as the transistor 286.
During a usual operation, the gate of the transistor 506 is applied by a voltage same as that of the transistor 286. During a setting operation, a current is not allowed to flow through the transistor 506.
[0182]FIG. 36 shows a circuit diagram in a case the magnitude of a current is changed upon between a usual operation and a setting operation by the switch 507, as a circuit similar to that of FIG. 35. During a setting operation, the switch 507 is turned off thereby reducing the amount of current to a half. During a usual operation, the switch 507 is turned on. This can carry out a setting operation in a state approximate to a state of an actual operation, thus enhancing the effect of setting operation.
In the differential amplifier of FIG. 1I, reference numerals 272, 273 are n-channel transistors while reference numerals 274, 275 and 286 are p-channel transistors. The switch 281 has one terminal as an input terminal to input an input potential Vin1 to one terminal of the capacitance element 276. Also, the switch 284 has one terminal as an input terminal to input an input potential Vin2 to one terminal of the capacitance element 277. The potential on the source region of the transistor 275 provides an output potential Vout.
[0201]FIGS. 39A and 39B show an operational amplifier in a case that the region surrounded by the dotted line shown at 305 in FIG. 13B uses the same configuration as the differential amplifier circuit of FIG. 31. In FIGS. 39A and 39B, the source-follower circuit part is made as a push-pull circuit and hence a bias current source does not exist. Consequently, the current of a current source of the differential amplifier circuit is utilized as a current for use in a setting operation of the source-follower circuit (push-pull circuit). Namely, the transistor 286 is connectable to the push-pull circuit.
First explained is the configuration of the circuit of the pixel 713 arranged at i-th column and i-th row and the bias circuit 714 at around the i-th column.
[0218]247 is a reference constant-current source having a capability to flow a constant current. The reference constant-current source 247 is configured by a semiconductor element such as a transistor. In the present specification, the reference constant-current source 247 configured by a transistor will be explained in its one example in Embodiment 6. This can be made reference to conveniently.
[0248]FIG. 17 shows a signal-line drive circuit. The signal-line drive circuit has a sift register 321, a first latch circuit 322, a second latch circuit 323, a D/A converter circuit 324 and a signal amplifier circuit 325.
First explained is the scheme of a reference constant-current source, by using FIGS. 20A and 20B. In FIG. 20A, 401 is a reference constant-current source. The reference constant-current source 401 has a terminal-A, a terminal-B and a terminal-C. The terminal-A is inputted by a setting signal. T he terminal-B is supplied by a current from a current feed line 405. Through the terminal-C, a current set by the reference constant-current source 401 is supplied to the external. Namely, the reference constant-current source 401, under control of a set signal inputted to the terminal-A, is supplied with a current at the terminal B, to supply a current through the terminal-C.
Incidentally, in the electric circuit of FIGS. 21A-21F, a current is flowing from the terminal-C toward a ground potential Vss. FIG. 22 shows a circuit configuration in a case that the transistors 52, 65, 66 have a p-channel type of polarity wherein a current is flowing from the terminal-C toward a ground potential Vss.
[0293]FIG. 4A is a light-emitting apparatus including a housing 3001, a support base 3002, a display part 3003, a speaker part 3004 and a video-input terminal 3005. The present invention can be used in an electric circuit configuring the display part 3003. Also, the light-emitting apparatus of FIG. 4A can be completed by the invention. Because the light-emitting apparatus is of a spontaneous emission type, a backlight is not required. Thus, the display part can be made smaller in thickness than the liquid crystal display. Incidentally, the light-emitting apparatus includes a display unit for displaying all the pieces of information for personal computers, TV broadcast reception, displaying advertisement and so on.
[0294]FIG. 4B is a digital still camera, including a main body 3101, a display part 3102, an image receiving part 3103, an operation key 3104, an external-connection port 3105 and a shutter 3106. The invention can be used in an electric circuit configuring the display part 3102. Also, the digital still camera of FIG. 4B is to be completed by the invention.
[0295]FIG. 4C is a notebook personal computer, including a main body 3201, a housing 3202, a display part 3203, a keyboard 3204, an external-connection port 3205 and a pointing mouse 3206. The invention can be used in an electric circuit configuring the display part 3203. Also, the light emitting device of FIG. 4C is to be completed by the invention.
[0296]FIG. 4D is a mobile computer, including a main body 3301, a display part 3302, a switch 3303, an operation key 3304 and an infrared ray port 3305. The invention can be used in an electric circuit configuring the display part 3302. Also, the mobile computer of FIG. 4D is completed by the invention.
[0297]FIG. 4E is a portable image reproducing apparatus having a recording medium (specifically, DVD reproducing apparatus), including a main body 3401, a housing 3402, a display part-A 3403, a display part-B 3404, a recording-medium (DVD or the like) reading part 3405, an operation key 3406 and a speaker part 3407. The display part-A 3403 is to display, mainly, image information while the display part-B 3404 is to display, mainly, character information. The invention can be used in an electric circuit configuring the display parts A and B 3403, 3404. Incidentally, the image reproducing apparatus having a recording medium includes a home-use game apparatus. Also, the DVD reproducing apparatus of FIG. 4E is to be completed by the invention.
[0298]FIG. 4F is a goggle-type display (head-mount display), including a main body 3501, a display part 3502 and an arm part 3503. The invention can be used in an electric circuit configuring the display part 3502. Also, the goggle-type display of FIG. 4F is to be completed by the invention.
[0299]FIG. 4G is a video camera, including a main body 3601, a display part 3602, a housing 3603, an external-connection port 3604, a remote-control receiving part 3605, an image receiving part 3606, a battery 3607, a sound input part 3608, an operation key 3609, and eyepiece 3610. The invention can be used in an electric circuit configuring the display part 3602. Also, the video camera of FIG. 4G is to be completed by the invention.
[0300]FIG. 4H is a cellular phone, including a main body 3701, a housing 3702, a display part 3703, a sound input part 3704, a sound output part 3705, an operation key 3706, an external-connection port 3707 and an antenna 3708. The invention can be used in an electric circuit configuring the display part 3703. Incidentally, the display part 3703 can suppress the cellular phone from consuming current by displaying white characters on a black background. Also, the cellular phone of FIG. 4H is to be completed by the invention.
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International Classification H03F1/30, H03F3/50, G11C27/02, H03F3/45, H03F3/08, H03K19/003
Cooperative Classification H03K19/00384, H03F3/45183, H03F3/082, G11C27/028, H03F3/45179
European Classification G11C27/02C2, H03F3/08B, H03K19/003K4, H03F3/45S1B1