WO2010143557A1 - 半導体装置 - Google Patents
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- WO2010143557A1 WO2010143557A1 PCT/JP2010/059246 JP2010059246W WO2010143557A1 WO 2010143557 A1 WO2010143557 A1 WO 2010143557A1 JP 2010059246 W JP2010059246 W JP 2010059246W WO 2010143557 A1 WO2010143557 A1 WO 2010143557A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
- H01L27/0251—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices
- H01L27/0255—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices using diodes as protective elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136204—Arrangements to prevent high voltage or static electricity failures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/01—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate comprising only passive thin-film or thick-film elements formed on a common insulating substrate
- H01L27/016—Thin-film circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/7869—Thin film transistors, i.e. transistors with a channel being at least partly a thin film having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
Definitions
- the present invention relates to a semiconductor device including a circuit including an ESD (electrostatic discharge) protection circuit.
- ESD electrostatic discharge
- FIG. 35 is a diagram illustrating an example of an ESD protection circuit provided in an IC internal circuit having a CMOS (Complementary Metal Oxide Semiconductor).
- the illustrated ESD protection circuit includes a protection resistor R formed between the input terminal and the CMOS, and two protection diodes D1 and D2 having different polarities. Both the protective diodes D1 and D2 are connected to a CMOS input signal line.
- the potential at the input terminal increases (+) or decreases (-).
- the protective diode D1 is turned on, and positive charge is released to the VCC line.
- the protective diode D2 is turned on, and the negative charge is released to the VSS line. The flowing current is limited by the protective resistance R.
- a circuit including a thin film transistor (TFT: Thin Film Transistor) provided as a switching element in each pixel is formed on the active matrix substrate of the display device using a semiconductor film such as silicon or a metal oxide semiconductor.
- a protection circuit is provided to prevent these TFTs and wirings from being damaged by static electricity (for example, Patent Document 1).
- FIG. 36 is a diagram showing a conventional active matrix substrate having a protection circuit. This configuration is disclosed in Patent Document 1.
- the active matrix substrate includes a plurality of scanning lines 203 formed on an insulating substrate, a plurality of signal lines 204, and a plurality of thin film transistors 205 formed at intersections thereof. It has an array 240.
- the source electrode of each thin film transistor 205 is connected to the signal line 204, the gate electrode is connected to the scanning line 203, and the drain electrode is connected to a pixel electrode (not shown).
- each scanning line 203 is connected to the reference potential line 231 through the protection circuit 250.
- the protection circuit 250 includes two thin film diodes 228 and 229 having different polarities.
- each signal line 204 is connected to the reference potential line 232 via the protection circuit 251. According to such a configuration, even when a positive or negative charge is applied to the scanning line 203 or the signal line 204, the charge can be released to the reference potential lines 231 and 232 by the protection circuits 250 and 251.
- the thin film diodes 226 to 229 used in the protection circuits 250 and 251 shown in FIG. 36 have a structure in which a source and a gate of a thin film transistor (for example, a thin film transistor 205 for a pixel) are short-circuited.
- a diode having a structure in which a gate and a source or drain of a thin film transistor are short-circuited is referred to as a “three-terminal diode”.
- the peripheral circuit is formed in a region (referred to as a “frame region”) other than a region including a plurality of pixels (referred to as a “display region”) on the active matrix substrate.
- a protection circuit for an element such as a thin film transistor included in the peripheral circuit for example, Patent Document 2.
- FIG. 37 is a diagram showing an insulated gate transistor circuit for inputting a clock signal to the drive circuit formed in the frame region of the active matrix substrate.
- the circuit configuration shown in FIG. 37 is disclosed in Patent Document 2.
- the circuit shown in FIG. 37 includes an insulated gate transistor circuit 1001 disposed between an electrode pad (OLB pad) 1011 to which a clock signal is input and a driver circuit portion, and protection circuits 1013 and 1016. .
- the protection circuit 1013 is provided at the input portion of the circuit 1001 and includes diodes 1014 and 1015 having different polarities.
- the protection circuit 1016 is provided at the output portion of the circuit 1001 and includes diodes 1017 and 1018 having different polarities.
- the diodes 1014 and 1017 are connected to the VDD line, and the diodes 1015 and 1018 are grounded.
- the conventional ESD protection circuit is provided mainly to protect the three-terminal type thin film transistor.
- at least two diodes having different polarities a forward bias and a forward bias
- Reverse bias it is formed at the input end, the output end, or both of the circuit including the thin film transistor to be protected. For this reason, static electricity can be prevented from entering from the input side or the output side of the circuit including a three-terminal thin film transistor formed over the insulating substrate.
- an external connection pad (input side of the driver circuit) connected to the drive circuit, or a drive circuit (monolithic driver) formed in the frame region, or Static electricity can be prevented from flowing from the scanning wiring and signal wiring (output side of the driver circuit).
- a conventional protection circuit as shown in FIGS. 35 to 37 includes at least two diodes. For this reason, there is a problem that the circuit scale is increased by providing the protection circuit.
- the conventional protection circuit is applied to, for example, a monolithic driver, the frame area of the display device is enlarged, and as a result, the display area may be reduced.
- the conventional protection circuit is arranged to protect the three-terminal type thin film transistor.
- a three-terminal diode is more easily destroyed by static electricity than a three-terminal transistor. The reason for this will be described in detail later. Therefore, according to the conventional configuration, in a circuit including a three-terminal diode as an in-circuit element, there is a possibility that deterioration of element characteristics due to static electricity or malfunction of the circuit cannot be sufficiently prevented.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a circuit formed on an insulating substrate for an element included in the circuit without significantly increasing the circuit scale. It is to efficiently suppress electrostatic breakdown.
- the semiconductor device of the present invention is a semiconductor device formed on a substrate and including a circuit including a thin film diode and a protection circuit including a protective diode, the thin film diode formed on the substrate, At least one semiconductor layer having one region, a second region, a channel region located between the first region and the second region, a gate electrode disposed so as to overlap the channel region, A gate insulating layer formed between a gate electrode and the semiconductor layer; a first electrode provided on the first region and electrically connected to the first region and the gate electrode; And a second electrode electrically connected to the second region, and (a) the conductivity type of the thin film diode is N-type, and the electrode on the anode side of the protective diode is Above Connected to the gate electrode of the membrane diode or the wiring connected to the first electrode, or (b) the conductivity type of the thin film diode is P-type, and the electrode on the cathode side of the protective diode is The thin film diode is connected to the
- the protective diode is formed on the substrate and includes at least one of a first region, a second region, and a channel region located between the first region and the second region.
- Two semiconductor layers a gate electrode disposed so as to overlap the channel region, a gate insulating layer formed between the gate electrode and the semiconductor layer, and the first region.
- a first electrode electrically connected to the region and the gate electrode; and a second electrode provided on the second region and electrically connected to the second region.
- the semiconductor layer of the thin film diode and the semiconductor layer of the protective diode may be formed from the same semiconductor film.
- the thin film transistor further includes a plurality of thin film transistors, wherein the plurality of thin film transistors have the same conductivity type as that of the thin film diode, and the semiconductor layers of the plurality of thin film transistors are formed of the same semiconductor film as the semiconductor layer of the thin film diode. May be.
- no protective circuit is provided on the wiring connected to the gate electrode of the thin film transistor.
- the circuit includes an input unit that inputs a signal from the outside to the circuit or an output unit that outputs a signal from the circuit to the outside, and is provided between the thin film diode and the protective diode.
- the wiring length is smaller than the wiring length between the input unit or the output unit and the protective diode.
- the wiring length between the thin film diode and the protective diode is preferably 1 mm or less.
- the conductivity type of the thin-film diode is N-type
- the electrode on the anode side of the protective diode is connected to the gate electrode or the first electrode of the thin-film diode.
- the conductivity type of the thin-film diode is N-type
- the electrode on the anode side of the protective diode is connected to the gate electrode or the first electrode of the thin-film diode.
- the electrode on the cathode side of the protection diode is connected to the wiring of the VDD power source.
- the conductivity type of the thin film diode is P type
- an electrode on the cathode side of the protective diode is connected to the gate electrode or the first electrode of the thin film diode.
- the conductivity type of the thin film diode is P type
- an electrode on the cathode side of the protective diode is connected to the gate electrode or the first electrode of the thin film diode.
- the electrode on the anode side of the protective diode is connected to the wiring of the VSS power source.
- the circuit may include a shift register.
- electrostatic breakdown of a three-terminal diode included in the circuit can be suppressed without significantly increasing the circuit scale.
- the malfunction of the circuit resulting from it can be prevented efficiently.
- the present invention is particularly effective when applied to an active matrix substrate having a drive circuit.
- FIG. 4B is a diagram for explaining an example of the relationship between the signal waveforms of the wiring 3 and the wiring 9 in these circuits.
- FIG. 4B is a diagram for explaining an example of the relationship between the signal waveforms of the wiring 3 and the wiring 8 in these circuits.
- FIG. 3 is a diagram illustrating a part of the circuit according to the first embodiment.
- FIG. 6 is a diagram illustrating a part of the circuit according to the second embodiment.
- FIG. 6 is a diagram illustrating a part of a circuit according to a third embodiment.
- FIG. 10 is a diagram illustrating a part of the circuit according to the fourth embodiment.
- FIG. 10 is a diagram illustrating a part of the circuit of Example 5.
- FIG. 10 is a diagram illustrating a part of the circuit of the sixth embodiment when the gate electrode of the in-circuit diode is connected to a plurality of wirings;
- FIG. 10 is a diagram illustrating a part of the circuit of the seventh embodiment when the gate electrode of the in-circuit diode is connected to a plurality of wirings;
- FIG. 10 is a diagram illustrating a part of the circuit in Example 8 when the gate electrode of the diode in the circuit is connected to a plurality of wirings; It is a circuit of Example 9, and is a diagram illustrating a part of the circuit when the gate electrode of the diode in the circuit is connected to a plurality of wirings.
- Example 10 It is a circuit of Example 10, Comprising: It is a figure which illustrates a part of circuit when the gate electrode of the diode in a circuit is connected to several wiring. It is a circuit of Example 11, Comprising: It is a figure which illustrates a part of circuit when the gate electrode of the diode in a circuit is connected to several wiring. It is a circuit of Example 12, Comprising: It is a figure which illustrates a part of circuit when the gate electrode of the diode in a circuit is connected to several wiring. It is a circuit of Example 13, Comprising: It is a figure which illustrates a part of circuit when the 1st electrode (source electrode) of the diode in a circuit is connected to several wiring.
- FIG. 10 It is a figure which illustrates a part of circuit when the gate electrode of the diode in a circuit is connected to several wiring.
- Example 11 Comprising: It is a figure which illustrates a part of circuit when the gate electrode of the diode in a
- FIG. 28 is a diagram illustrating a part of the circuit in Example 14 when the first electrode (source electrode) of the in-circuit diode is connected to a plurality of wirings;
- FIG. 25 is a diagram illustrating a part of the circuit in Example 15 when the conductivity type of the in-circuit diode is P type. It is a typical sectional view showing an in-circuit diode in a 1st embodiment by the present invention.
- (A) is a schematic plan view of the active matrix substrate of a liquid crystal display panel
- (b) is a top view which shows the typical structure of one pixel.
- It is a block diagram of the shift register of 2nd Embodiment by this invention. It is a block diagram of the other shift register of 2nd Embodiment by this invention.
- (A) And (b) is a figure which shows the voltage-current characteristic of the diode MM and the transistor MN in the shift register of a comparative example. It is a block diagram of the further another shift register of the 2nd Embodiment by this invention. It is a block diagram of the circuit of 3rd Embodiment by this invention. It is a block diagram of the other circuit of the 3rd Embodiment by this invention. It is a block diagram of the further another circuit of 3rd Embodiment by this invention. It is a block diagram of the further another circuit of 3rd Embodiment by this invention.
- the three-terminal thin film diode as described above is used as the thin film diode in order to form the thin film transistor and the thin film diode by a common process. May form.
- a three-terminal thin film diode in a circuit is more susceptible to static electricity than a three-terminal thin film transistor. The reason will be described below.
- a diode that is a main component of a circuit and is necessary for the circuit to perform a predetermined function is called an “in-circuit diode”, and a diode included in the protection circuit is called a “protection diode”. Distinguish between the two.
- FIG. 1 and FIG. 2 are diagrams for explaining the influence of static electricity on the in-circuit diode and the in-circuit transistor, respectively.
- an N channel type diode and a transistor will be described as an example.
- the in-circuit diode 1 shown in FIG. 1 has three terminals: a gate electrode G, a source electrode S, and a drain electrode D.
- the gate electrode G is connected to the wiring 3, and the drain electrode D is connected to another wiring (for example, VDD wiring) 5.
- the source electrode S is short-circuited to the gate electrode G.
- a positive voltage is simultaneously applied to the source electrode S connected to the gate electrode G.
- the diode 1 since the potential of the source electrode S becomes higher than the potential of the drain electrode D, the diode 1 is turned on, and a large current flows between the source electrode S and the drain electrode D. As a result, the channel layer in the diode 1 may be deteriorated.
- the source electrode S is not short-circuited to the gate electrode G and is connected to the wiring 7 different from the wirings 3 and 5.
- the electrodes G, D, and S are respectively connected to separate wirings, even if positive static electricity is input to the gate electrode G, the potential of the source electrode S and the potential of the drain electrode D are approximately Since they are kept equal, there is a high possibility that the transistor 10 is not turned on. Therefore, the in-circuit transistor 10 is not easily affected by static electricity, and the possibility that the channel layer of the in-circuit transistor 10 is deteriorated by static electricity is low.
- the present inventor provides a protection circuit to a three-terminal diode that is particularly susceptible to static electricity among the in-circuit elements, thereby deteriorating the characteristics of the in-circuit elements due to static electricity and malfunctioning of the circuit. Has been found to be able to be effectively prevented, leading to the present invention.
- FIG. 3A and FIG. 4A are diagrams for explaining the circuit configuration in the embodiment according to the present invention.
- FIG. 3A shows a case where the conductivity type of the in-circuit diode to be protected is N type (N channel type)
- FIG. 4A shows a case where the conductivity type of the in-circuit diode to be protected is P type.
- a (P-channel type) circuit is illustrated.
- the circuit shown in FIG. 3A includes an N-channel type in-circuit diode 1 and a protection circuit including a protection diode 20 for protecting the in-circuit diode 1.
- the in-circuit diode 1 is a three-terminal diode having a gate electrode G1, a first electrode (source electrode) S1, and a second electrode (drain electrode) D1, and the first electrode S1 and the gate electrode G1 are short-circuited. Yes.
- the electrode that is short-circuited to the gate electrode is referred to as a “first electrode”, and the other electrode is referred to as a “second electrode”. Therefore, when current flows from the source to the drain, the source electrode is the first electrode in the N-channel type diode, and the drain electrode is the first electrode in the P-channel type diode.
- the electrode on the anode side of the protective diode 20 is connected to the wiring 3 electrically connected to the gate electrode G1 of the diode 1 in the circuit, and the electrode on the cathode side is connected to the wiring (here, VDD wiring) 9. .
- the wiring 9 is not limited to the VDD wiring, and may be a wiring having a higher potential than the VDD wiring. Further, the wiring 9 is preferably not connected to the transistor, and may be a floating line.
- the signal of the wiring 9 may be a clock signal or the like having a High waveform in synchronization with the High waveform of the wiring 3. That is, the signal potential of the wiring 9 may be higher than the signal potential of the wiring 3. As a result, no current flows from the wiring 3 to the wiring 9, and no waveform rounding or increase in current consumption occurs.
- the protective diode 20 is a three-terminal diode having a gate electrode, a first electrode, and a second electrode.
- the conductivity type of the protective diode 20 is the same N type as the in-circuit diode 1.
- the gate electrode and the first electrode of the protective diode 20 are connected to the wiring 3, and the second electrode is connected to the VDD wiring 9.
- the wiring 3 is not provided with other protective diodes arranged so that the direction of current flow is opposite to that of the protective diode 20. Therefore, when negative static electricity is input to the wiring 3, the negative static electricity enters the in-circuit diode 1, and the potential of the first electrode S1 of the in-circuit diode 1 becomes lower than the potential of the second electrode D1. However, even if the potential of the first electrode S1 becomes lower than the potential of the second electrode D1, no current flows between these electrodes, so there is a very high possibility that the diode 1 in the circuit will deteriorate due to negative static electricity. Very low. Therefore, the in-circuit diode 1 can be appropriately protected from deterioration due to ESD without providing the protection diode 20 and other protection diodes having different current flow directions.
- the protective diode 20 is an N-channel type, but a P-channel type protective diode 22 may be used instead, as shown in FIG. 3 (c).
- the circuit shown in FIG. 4A includes a P-channel type in-circuit diode 2 and a protection circuit including a protection diode 22 for protecting the in-circuit diode 2.
- the in-circuit diode 2 is a three-terminal diode having a gate electrode G2, a first electrode (drain electrode) D2, and a second electrode (source electrode) S2, and the first electrode D2 and the gate electrode G2 are short-circuited. Yes.
- the cathode side electrode of the protection diode 22 is connected to the wiring 3 electrically connected to the gate electrode G2 of the in-circuit diode 2, and the anode side electrode is connected to the wiring (here, VSS wiring) 8. .
- the wiring 8 is not limited to the VSS wiring, and may be a wiring having a potential lower than that of the VSS wiring. Further, the wiring 8 is preferably not connected to the transistor, and may be a floating line.
- the signal of the wiring 8 may be a clock signal having a Low waveform in synchronization with the Low waveform of the wiring 3. That is, the signal potential of the wiring 8 may be equal to or lower than the signal potential of the wiring 3. As a result, no current flows from the wiring 3 to the wiring 8, and no waveform rounding or increase in current consumption occurs.
- the wiring 3 is not provided with other protective diodes arranged so that the direction of current flow is opposite to that of the protective diode 22.
- the in-circuit diode 2 can be appropriately protected from degradation due to ESD.
- the protection diode 20 is a P-channel type, but an N-channel type protection diode 20 may be used instead, as shown in FIG. 4C.
- the protection diodes 20 and 22 have positive charges on the gate electrode G1 and the first electrode S1 of the in-circuit diode 1. What is necessary is just to arrange
- the in-circuit diode 2 to be protected is P-type (FIG.
- the protection diodes 20 and 22 have negative charges on the gate electrode G2 and the first electrode D2 of the in-circuit diode 2.
- position so that it may have a bias direction which suppresses being charged. That is, when a negative charge is charged on the wiring 3 connected to the gate electrode G2 or the first electrode D2 of the in-circuit diode 2, the wiring 3 is positively connected to the other wiring 8 via the protective diode 22.
- position so that an electric charge may be released.
- an ESD countermeasure can be efficiently performed without increasing the circuit scale more than necessary. It can be performed.
- the protection circuit in the present embodiment does not include the protection diodes 20 and 22 and other protection diodes arranged so that the direction of current flow is reversed.
- the number of protective diodes can be reduced by half as compared with the conventional protection circuits (FIGS. 35 to 37), so that the diodes 1 and 2 in the circuit can be appropriately protected from ESD and more effective. Therefore, the circuit scale can be reduced.
- the protective diodes 20 and 22 are protected before the diodes 1 and 2 in the circuit are turned on when a voltage higher than a specified voltage is applied to the diodes 1 and 2 in the circuit.
- its formation position is not particularly limited.
- the gate electrodes G1 and G2 and the first electrodes S1 and D2 of the in-circuit diodes 1 and 2 in the present embodiment may not be directly connected to the input / output unit by the wiring 3.
- another in-circuit element such as a transistor may be provided between the input / output unit and the in-circuit diodes 1 and 2.
- the protective diodes 20 and 22 are preferably provided in the wiring 3 at a position as close as possible to the in-circuit diodes 1 and 2. Since the conventional protection circuit is provided at the input / output section of the circuit, the wiring from the protection circuit to the element to be protected in the circuit is long, and the wiring acts as an antenna to attract static electricity. There was a possibility of static electricity. On the other hand, if a protective circuit is installed near the element to be protected (diodes 1 and 2 in the circuit), not only when static electricity enters the circuit from the input / output part of the circuit, but also during the manufacturing process, for example. Even when static electricity is generated inside the circuit and static electricity is input from the wiring 3, it is possible to prevent the deterioration of the characteristics of the diodes 1 and 2 in the circuit due to the static electricity.
- the protective diodes 20 and 22 in the present embodiment are not limited to three-terminal thin film diodes as long as the diodes are arranged so as to have the predetermined bias direction.
- the protective diodes 20 and 22 are three-terminal thin film diodes, they can be formed using the same semiconductor film as the in-circuit diodes 1 and 2, which is advantageous from the viewpoint of the manufacturing process. In that case, it is preferable that the in-circuit diodes 1 and 2 have the same conductivity type as the protection diodes 20 and 22.
- the circuit in this embodiment preferably includes a thin film transistor in addition to the in-circuit diodes 1 and 2. This is preferable because a thin film transistor, a protective diode, and an in-circuit diode can be manufactured using the same semiconductor film. At this time, it is more preferable that all of these elements are three-terminal types because they can be manufactured using a common manufacturing process.
- the protective circuit may not be formed in the thin film transistor (in-circuit transistor) in the circuit. This is because a three-terminal thin film transistor is less likely to deteriorate due to ESD than a thin film diode. In addition, the circuit scale can be more effectively reduced by not forming a protective circuit for protecting the thin film transistor.
- the semiconductor device of this embodiment includes a circuit including a three-terminal thin film diode (in-circuit diode) and an ESD protection circuit for protecting the thin film diode.
- the semiconductor device of this embodiment only needs to include the above-described circuit, and widely includes circuits such as a shift register, an active matrix substrate including such a circuit, a display device, and the like.
- FIGS. 5 to 18 are configuration diagrams showing a part of the circuits of Examples 1 to 14, respectively.
- the in-circuit diode 1 and the protection diode 20 are both N-channel three-terminal thin film diodes.
- the same components in these drawings are denoted by the same reference numerals and description thereof is omitted.
- the circuit according to the first embodiment illustrated in FIG. 5 includes the in-circuit diode 1 and a protection circuit including the protection diode 20.
- the first electrode and the gate electrode of the protection diode 20 are connected to the wiring 3 connected to the gate electrode of the in-circuit diode 1, and the second electrode of the protection diode 20 is connected to the VDD wiring.
- the connecting portions of the protective electrode 20 to the wiring 3 of the first electrode and the gate electrode are 3a and 3b, the first electrode of the diode 1 in the circuit is connected to the wiring 3 between the connecting portions 3a and 3b.
- a connection portion of the first electrode of the in-circuit diode 1 to the wiring 3 is 3c.
- Example 1 when a positive charge is input to the wiring 3, a current flows from the wiring 3 to the VDD wiring via the protective diode 20 as illustrated. For this reason, the amount of current flowing into the in-circuit diode 1 can be greatly reduced.
- the wiring 3 before the positive charge entered from the wiring 3 reaches the first electrode of the protection diode 20 before entering the gate electrode of the in-circuit diode 1, the wiring 3, the first electrode of the protection diode 20, and the protection
- the order of the connecting portions 3a, 3b, and 3c between the gate electrode of the diode 20 and the first electrode of the diode 1 in the circuit is not particularly limited.
- FIG. 6 and FIG. 7 show examples of circuits in which the order of the connecting portions 3a, 3b, and 3c is different.
- the gate electrode of the protective diode 20 and the connection 3c between the wiring 3 and the first electrode of the in-circuit diode 1 and the gate electrode of the in-circuit diode 1 The first electrode may be connected to the wiring 3 (3a, 3b).
- the first electrode of the in-circuit diode 1 and the wiring 3 are closer to the gate electrode side of the in-circuit diode 1 than the connection portions 3 a and 3 b between the wiring 3 and the protection diode 20.
- the connection part 3c may be arranged.
- Example 4 shown in FIG. 8 the first electrode of the in-circuit diode 1 and the wiring 3 are connected by the wiring 4, and the first electrode and the gate electrode of the protective diode 20 are connected to the wiring 4.
- the first electrode and the gate electrode of the protective diode 20 may be connected to the wiring 4 for connecting the first electrode of the in-circuit diode 1 and the wiring 3 instead of the wiring 3.
- a current flows from the wiring 4 to the VDD wiring through the protection diode 20, so that the amount of current flowing into the in-circuit diode 1 can be greatly reduced. .
- the gate electrode of the protection diode 20 is connected to the wiring 4 and the first electrode of the protection diode 20 is connected to the wiring 3. Even in this case, as indicated by an arrow, the positive charge that has entered the wiring 3 can flow from the wiring 3 to the VDD wiring.
- the first electrode and the gate electrode of the protective diode 20 are electrically connected to the gate electrode of the diode 1 in the circuit if connected to either the wiring 3 or the wiring 4. Therefore, the same effect as in the first to third embodiments can be obtained.
- the circuit of the sixth embodiment illustrated in FIG. 10 includes an in-circuit diode 1-g and a protection circuit for protecting the in-circuit diode 1-g.
- the gate electrode of the in-circuit diode 1-g is connected to the two wirings 3, 3 ′.
- a structure having a gate electrode connected to two or more wirings in this way is referred to as a “gate electrode branching structure”.
- the protection circuit includes a protection diode 20a for protecting the in-circuit diode 1-g from static electricity entering from the wiring 3 'and a protection for protecting the in-circuit diode 1-g from static electricity entering from the wiring 3.
- Example 6 when a positive charge is input to the wiring 3 ′, a current flows from the wiring 3 ′ through the wiring 3 to the VDD wiring by the protective diode 20 a.
- a current flows to the VDD wiring through the protective diode 20b as described above with reference to FIGS. Therefore, the in-circuit diode 1-g can be protected even if static electricity enters from any of the wirings 3, 3 'connected to the gate electrode of the in-circuit diode 1-g.
- Examples 7 to 11 are other circuits including the in-circuit diode 1-g having a gate electrode branching structure.
- the first electrodes and the gate electrodes of the protective diodes 20a and 20b are the wiring 3, the wiring 3 ′, and the wiring 4 (wiring for connecting the first electrode of the in-circuit diode 1 and the wiring 3). It is connected to either. In these embodiments, the same effect as in the sixth embodiment can be obtained.
- the gate electrode of the in-circuit diode 1-g may be connected to three or more wirings. In that case, in order to more reliably protect the in-circuit diode 1-g, it is preferable to provide the same number of protective diodes as the number of wirings to be connected.
- the in-circuit diode 1-g having the gate electrode branching structure may be reliably protected by one protective diode 20 in some cases.
- the wiring length L33 from the connection portion (referred to as “branch point”) between the wiring 3 and the wiring 4 to the protective diode 20 It is smaller than the wiring length L35 to the first electrode.
- the resistance from the branch point to the protective diode 20 is smaller than the resistance from the branch point to the first electrode of the in-circuit diode 1-g, positive static electricity is input from the wiring 3 ′.
- the current 31 is discharged by the protective diode 20 before reaching the first electrode of the in-circuit diode 1. For this reason, destruction by the static electricity of the diode 1 in a circuit can be prevented, without adding a protection diode.
- the circuit of the thirteenth embodiment shown in FIG. 17 includes an in-circuit diode 1-s and a protection circuit for protecting the in-circuit diode 1-s.
- the first electrode of the in-circuit diode 1-s is connected to the two wirings 4, 4 ′.
- the wiring 4 is connected to the wiring 3 connected to the gate electrode of the in-circuit diode 1-s.
- a structure having the first electrode connected to two or more wirings in this way is referred to as a “first electrode branching structure”.
- the protection circuit includes a protection diode 20a for protecting the in-circuit diode 1-s from static electricity entering from the wiring 4 'and a protection for protecting the in-circuit diode 1-s from static electricity entering from the wiring 3.
- the first electrode and the gate electrode of the protective diode 20a are connected to the wiring 4 ′.
- the first electrode and the gate electrode of the protective diode 20 b are connected to the wiring 3 or the wiring 4.
- Example 13 when a positive charge is input to the wiring 4 ', a current flows from the wiring 4' to the VDD wiring by the protective diode 20a. On the other hand, when a positive charge is input from the wiring 3, a current flows from the wiring 4 to the VDD wiring through the protective diode 20b. Therefore, the in-circuit diode 1-s can be protected even if static electricity enters from any of the wirings 3, 4, 4 'connected to the first electrode of the in-circuit diode 1-s.
- Example 14 shown in FIG. 18 is another circuit including the in-circuit diode 1-s having the first electrode branching structure.
- the fourteenth embodiment is different from the thirteenth embodiment in that the first electrode of the protective diode 20 a is connected to the wiring 4 ′ and the gate electrode is connected to the wiring 4. Even in this case, the positive charge input from the wiring 4 ′ can be released by the protective diode 20 a, so that the same effect as in the thirteenth embodiment can be obtained.
- the circuit of the fifteenth embodiment has the same configuration as the circuit of the first embodiment shown in FIG. 5 except that the in-circuit diode and the protection diode are changed to the P-channel type.
- the protective diode 22 is also a P-channel three-terminal diode.
- the first electrode and the gate electrode of the protective diode 22 are connected to the wiring 3. Assuming that the connection portions of the first electrode and the gate electrode of the protective diode 22 to the wiring 3 are 3a and 3b, the first electrode of the in-circuit diode 2 is connected to the wiring 3 and the connection portion 3c between the connection portions 3a and 3b. Connected with.
- the second electrode of the protective diode 22 is connected to the VSS wiring.
- Example 15 when negative static electricity is input to the wiring 3, a current flows from the VSS wiring to the wiring 3 through the protective diode 22 as illustrated. For this reason, the amount of current flowing between the first and second electrodes of the in-circuit diode 2 can be greatly reduced.
- the conductivity types of the in-circuit diode and the protection diode can be changed to the P type.
- FIG. 20 is a schematic cross-sectional view illustrating a three-terminal type diode.
- the diode (N-channel diode) 500 includes a gate electrode 530, a semiconductor layer 534 formed over the gate electrode 530 with a gate insulating film 532 interposed therebetween, and a first electrode electrically connected to both ends of the semiconductor layer 534.
- One electrode (source electrode) 536 and a second electrode (drain electrode) 538 are provided.
- Contact layers 540 are formed between the semiconductor layer 534 and the first and second electrodes 536 and 538, respectively.
- the first electrode 536 is connected to the gate electrode 530 in the contact hole 542.
- the semiconductor layer 534 is not particularly limited, but may be an amorphous silicon layer, a polycrystalline silicon layer, a microcrystalline silicon layer, a metal oxide semiconductor layer (for example, an IGZO layer), or the like.
- the microcrystalline silicon layer is, for example, a layer having a plurality of columnar microcrystalline grains and a crystal grain boundary composed of an amorphous phase.
- the volume fraction of the amorphous phase in the microcrystalline silicon layer is, for example, 5 to 40%.
- the peak height of the amorphous phase by Raman scattering spectrum analysis is 1/3 to 1/10 times the peak height of the microcrystalline portion.
- the metal oxide semiconductor layer can be, for example, a Zn—O based semiconductor (ZnO), an In—Ga—Zn—O based semiconductor (IGZO), an In—Zn—O based semiconductor (IZO), or a Zn—Ti—O based.
- ZnO Zn—O based semiconductor
- IGZO In—Ga—Zn—O based semiconductor
- IZO In—Zn—O based semiconductor
- Zn—Ti—O based Zn—Ti—O based.
- the first electrode (anode side) 536 of the diode 500 is connected to the wiring 3 and the second electrode (cathode side) 538 is connected to the VDD wiring. Good.
- the protective diode included in the circuit of the present embodiment is not limited to a three-terminal diode as long as it is a diode arranged to have a predetermined bias direction.
- the conductivity types of the protection diodes 20 and 22 are the same as the conductivity types of the in-circuit diodes 1 and 2, but these conductivity types may be different.
- the present embodiment is preferably applied to a circuit including a thin film transistor and a thin film diode as in-circuit elements. This is because the three-terminal type in-circuit diodes 1 and 2 in the present embodiment are manufactured by using a process common to the thin film transistor, and thus the manufacturing process can be simplified. In particular, when a three-terminal diode is formed as the protective diode 20, the manufacturing process can be further simplified.
- a circuit having a single channel structure is a circuit in which a plurality of thin film transistors and thin film diodes included in the circuit all have the same conductivity type, that is, all are N-type or all are P-type.
- the semiconductor device of this embodiment is a shift register.
- the shift register of this embodiment is provided, for example, on an active matrix substrate of a display device.
- FIG. 21A is a schematic plan view of an active matrix substrate 601 of a liquid crystal display panel
- FIG. 21B shows a schematic structure of one pixel.
- a gate driver 610 and a source driver 620 are integrally formed on the active matrix substrate 601.
- a plurality of pixels are formed in the display area of the liquid crystal display panel 600, and the area of the active matrix substrate 601 corresponding to the pixels is indicated by reference numeral 632.
- the source driver 620 is not necessarily formed integrally with the active matrix substrate 601.
- a separately produced source driver IC or the like may be mounted by a known method.
- the active matrix substrate 601 has a pixel electrode 601P corresponding to one pixel of the liquid crystal display panel 600.
- the pixel electrode 601P is connected to the source bus line 601S through the pixel TFT 601T.
- the gate electrode of the TFT 601T is connected to the gate bus line 601G.
- the pixel may have a pixel auxiliary capacitor (not shown).
- the gate bus line 601G is connected to the output of the gate driver 610, and is scanned line-sequentially.
- the output of the source driver 620 is connected to the source bus line 601S, and a display signal voltage (grayscale voltage) is supplied.
- the gate driver 610 includes a shift register.
- the shift register is supported by an insulating substrate such as a glass substrate that forms the active matrix substrate 601.
- the shift register of this embodiment includes a TFT and a TFD. These TFTs and TFDs are a three-terminal type formed using the same process as the pixel TFT 601T formed in the display region of the active matrix substrate 601.
- FIG. 22 is a configuration diagram illustrating the shift register of this embodiment.
- the shift register 50 has a plurality of stages. Here, only three of the first stage, the n ⁇ 1 stage, and the n stage are schematically shown.
- the plurality of stages have substantially the same structure and are cascaded.
- the output Gout from each stage of the shift register 50 is given to each gate bus line of the liquid crystal display panel.
- the first stage of the shift register 50 is connected to the external connection pad 51 by the S signal input line 52.
- the S signal is input from the external connection pad 51 to the first stage.
- the output signal Gout (Gout (n ⁇ 1)) of the previous stage is input as the S signal (Gout (n ⁇ 1) S).
- each stage of the shift register 50 includes a three-terminal type diode MM connected to the S signal input line 52, a first transistor MG that outputs an output signal Gout, and a source region or a drain thereof.
- the region has a plurality of second transistors (MN, MK, MH) electrically connected to the gate electrode of the first transistor MG.
- the first transistor MG is a so-called pull-up transistor, and a wiring connected to the gate electrode of the first transistor MG is referred to as netA.
- the gate electrode and the first electrode of the diode MM are connected to the S signal input line 52, and the second electrode is connected to the netA.
- the conductivity types of these diodes and transistors are all N-type.
- the S signal input line 52 is provided with a protection circuit 53 for protecting the diode MM.
- the protection circuit 53 is disposed in the vicinity of the diode MM.
- the protection circuit 53 includes a protection diode in which an anode side electrode is connected to the S signal input line 52 and a cathode side electrode is connected to the VDD wiring.
- the configuration of the protection diode in this embodiment is an N-channel diode having the configuration described above with reference to FIG. Further, as described above with reference to FIGS. 5 to 9, they are arranged so that a current flows from the S signal input line 52 to the VDD wiring.
- the output signal Gout is output from each stage to the gate bus line only during the pixel writing time. Focusing on one stage, the potential of Gout remains at VSS over most of the time in one frame period (a period until all the gate bus lines are sequentially selected and again selected). It is configured to be fixed.
- the S signal (signal S from the external connection pad 51 or signal Gout (n ⁇ 1) S from the previous stage) is sent from the S signal input line 52 to the netA via the diode MM, and precharges the netA.
- the transistors MN, MK and MH whose source or drain is connected to netA are off.
- the capacitor CAP1 keeps the potential of netA and assists the output.
- the transistor MJ sets the potential of the output signal Gout to Low.
- the transistor ML sets the potential of the output signal Gout to Low in response to the clock signal CKB.
- the clear signal CLR is transmitted to all stages of the shift register once in one frame (vertical scanning period) and in the vertical blanking period (from the output of the last stage of the shift register to the output of the first stage). Supplied, netA of all stages is set to Low.
- the clear signal CLR also serves as a reset signal for the final stage of the shift register.
- the shift register of this embodiment may further include a protection circuit in the input unit and the output unit of each stage.
- FIG. 23 is a diagram showing another configuration of the shift register of the present embodiment.
- the same components as those in FIG. 22 are denoted by the same reference numerals, and description thereof is omitted.
- the shift register 60 includes, in addition to the protection circuit 53, a protection circuit 61 provided in the vicinity of the external connection pad 51, and a protection circuit 63 provided in the gate bus line at each stage. Other configurations are the same as those of the shift register 50 shown in FIG.
- Each of the protection circuits 61 and 63 includes two protection diodes D1 and D2 having different bias directions. Therefore, when a positive charge is input from the external connection pad 51 to the S signal input line 52, a current flows through the diode D1 of the protection circuit 61, and the positive charge is released to the VDD wiring. On the other hand, when a negative charge is input from the external connection pad 51, a current flows through the diode D2 of the protection circuit 61, and the negative charge is released to the VSS wiring.
- the shift registers 50 and 60 shown in FIG. 22 and FIG. 23 include the protection circuit 53 for protecting the diode MM from ESD, they have the following advantages.
- FIG. 24 shows a shift register 70 in which protection circuits 61 and 63 are provided only in the input / output section.
- the shift register 70 has the same configuration as the shift register 60 shown in FIG. 23 except that the shift register 70 does not have the protection circuit 53 for protecting the diode MM.
- the protection circuit 61 can protect the elements in the circuit included in the first stage of the shift register 70 from static electricity input from the external connection pad 51 to the S signal input line 52.
- the protection circuit 63 provided in the gate bus line of the (n ⁇ 1) th stage is connected to the rear stage (nth stage) of the shift register 70 from static electricity inputted to the gate bus line from the outside (pixel area side).
- In-circuit elements included in the circuit can be protected.
- the wiring from the protection circuits 61 and 63 to the in-circuit elements for example, the diode MM and the transistor MN
- the wiring acts as an antenna and draws static electricity (arrows 71 and 72).
- the three-terminal type diode MM among the elements in the circuit is likely to be deteriorated or destroyed.
- the present inventor examined changes in characteristics of the diode MM and the transistor MN in the shift transistor 70, and will be described below.
- FIGS. 25A and 25B are diagrams showing voltage (Vg) -current (Id) characteristics of the diode MM and the transistor MH in the 69th to 78th stages (LINE69 to LINE78) of the shift register 70 shown in FIG. is there.
- Vg voltage
- Id current
- the protection circuit 53 for protecting the diode MM is provided closer to the diode MM than the protection circuits 61 and 63 of the input / output unit.
- the wiring length between the protection diode of the protection circuit 53 and the diode MM is larger than the wiring length (for example, 10 mm) between the input / output unit such as the external connection pad 51 and the protection diode of the protection circuit 53. Is preferably sufficiently small (for example, 1 mm or less).
- the wiring from the first electrode and the gate electrode of the protective diode is connected to the S signal input line 52 so as to sandwich the connection portion between the first electrode of the diode MM and the S signal input line 52.
- the wiring length between the protection circuit 53 and the diode MM is substantially zero.
- the protection circuit 53 in this embodiment does not need to be arranged in the input / output part of the circuit as in the prior art, and is preferably formed at a position closer to the diode to be protected. Therefore, it may not be directly connected to the wiring from the input / output unit, and another in-circuit element may be provided between the input / output unit and the protection circuit 53.
- the configuration of the shift register of the present embodiment is not limited to the configurations shown in FIGS.
- the present embodiment can be applied to various shift registers including a thin film diode as an in-circuit element.
- FIG. 26 is a diagram for explaining another shift register 80 of the present embodiment.
- the shift register 80 is composed of a plurality of stages, and each stage has a configuration as shown in FIG.
- Each stage of the shift register 80 includes a diode 81 disposed between the S signal input line 84 and the wiring NetA, and a protection circuit 83 for protecting the diode 81.
- the gate electrode and the first electrode of the diode 81 are connected to the S signal input line 84, and the second electrode is connected to the wiring NetA.
- the protection circuit 83 includes a protection diode having an anode-side electrode connected to the S signal input line 84 and a cathode-side electrode connected to the VDD wiring.
- the first transistor M5 and the transistor M2 connected to the CK signal input line are each connected to the VDD wiring.
- the second transistors in the shift registers 50, 60, 80 described above all have a single channel structure, but may instead have a multichannel structure (for example, a dual channel structure).
- these transistors preferably have a multichannel structure. The reason for this will be described below.
- the leakage currents of these TFTs are relatively large, so that there is a high possibility that the above-described defects occur due to the leakage current.
- the leakage current in the subthreshold region of the microcrystalline silicon TFT having the multi-channel structure is smaller than that of the microcrystalline silicon TFT having the single channel structure, it is possible to suppress the rounding of the waveforms of the netA and the output signal Gout. Note that if a dual channel structure is introduced into at least one TFT of the plurality of second transistors, leakage current of the transistor can be reduced.
- FIG. 27 is a diagram illustrating a gate-on voltage generation circuit 90.
- a protection circuit 93 for protecting the in-circuit diode 91 is provided in a conventional gate-on voltage generation circuit (for example, disclosed in JP-A-8-262407).
- FIG. 28 is a diagram illustrating the gate-off voltage generation circuit 100.
- a protection circuit 103 for protecting the in-circuit diode 101 is provided in a conventional gate-off voltage generation circuit (for example, disclosed in JP-A-8-262407).
- FIG. 29 is a diagram illustrating the screen erase circuit 110.
- a protection circuit 113 for protecting the in-circuit diode 111 is provided in a conventional screen eraser circuit (for example, disclosed in Japanese Patent Laid-Open No. 9-127486).
- FIG. 30 is a diagram illustrating the off-voltage generation circuit 120.
- protection circuits 123A and 123B for protecting the in-circuit diode 121 are provided in a conventional off-voltage generation circuit (for example, disclosed in Japanese Patent Laid-Open No. 9-225591).
- protection circuits 123A and 123B are arranged on the input side and output side of the in-circuit diode 121, respectively, but the protection circuit is provided only on either the input side or the output side of the in-circuit diode 121. It may be done.
- FIG. 31 is a diagram illustrating the input signal correction circuit 130.
- a protection circuit 133 for protecting the in-circuit diode 131 is provided in a conventional input signal correction circuit (for example, disclosed in Japanese Patent Application Laid-Open No. 2007-822391).
- FIG. 32 is a diagram illustrating the level shift circuit 140.
- a protection circuit 143 for protecting the in-circuit diode 141 is provided in a conventional level shift circuit (for example, disclosed in Japanese Patent Laid-Open No. 2008-22539).
- the protection circuit of this embodiment is applied to various circuits including the in-circuit diode, and the same effect as that of the above-described embodiment can be obtained. Further, as in the examples shown in FIGS. 27 to 32, the present invention is suitably applied not only to the in-circuit diode but also to a circuit including the VDD wiring. This is because it is not necessary to route the VDD wiring for the purpose of forming the protection circuit, and thus the protection circuit can be formed without increasing the circuit scale.
- the protection diode in the present invention refers to a diode included in a protection circuit that protects a diode in the circuit, and does not include a diode for protecting the protection diode.
- a diode for protecting the protective diode is disclosed in, for example, Japanese Patent Laid-Open No. 3-206666.
- FIG. 33A is a diagram showing a circuit 300 disclosed in Japanese Patent Laid-Open No. 3-206666, and FIG. 32B is an enlarged view of a part of the circuit 300.
- the circuit 300 includes parasitic diodes 304, 305, and 306 for protecting the thin film transistor 10. Protection diodes 308 and 309 for protecting the parasitic diodes 305 and 306 are connected in parallel with the protection diodes 305 and 306, respectively.
- the protective diodes 308 and 309 protect the protective diodes (parasitic diodes) 305 and 306, not the in-circuit diodes (diodes that are the main components of the circuit). Further, since the protective diode 308 and the parasitic diode 305 are connected in parallel, for example, when a voltage is applied to the parasitic diode 305 to turn it on, the protective diode 308 is also turned on and current flows. Thus, the parasitic diode 305 and the protection diode 308 are simultaneously turned on, and both output currents flow through the same wiring (VCC wiring).
- the parasitic diode 305 is not a main component of the circuit, there is no problem even if the parasitic diode 305 and the protection diode 308 are connected to a common wiring. Assuming that the parasitic diode 305 is an in-circuit diode, the protection diode 308 may cause a malfunction of the circuit. Since the in-circuit diode and the protection diode are connected in parallel, only the in-circuit diode cannot be turned on, and the output currents of the in-circuit diode and the protection diode both flow through the common output line. Because.
- the diode to be protected is an in-circuit diode.
- the in-circuit diode 1 and the protection diode 20 to be protected are connected to separate output lines, respectively. For this reason, even if the optimum voltage is applied to the in-circuit diode 1 and it is turned on, the protective diode 20 is not turned on. Therefore, the protective diode 20 does not affect the current value of the output line of the in-circuit diode 1 and thus does not cause the circuit to malfunction.
- the present invention can be applied to various semiconductor devices including a circuit formed on an insulating substrate.
- circuit boards such as active matrix substrates, liquid crystal display devices, display devices such as organic electroluminescence (EL) display devices and inorganic electroluminescence display devices, imaging devices such as flat panel X-ray image sensor devices, and image input
- the present invention can be widely applied to devices including thin film transistors, such as electronic devices such as devices and fingerprint readers.
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Abstract
Description
本発明による半導体装置の第1実施形態を説明する。本実施形態の半導体装置は、3端子型の薄膜ダイオード(回路内ダイオード)と、その薄膜ダイオードを保護するためのESD保護回路とを含む回路を備える。なお、本実施形態の半導体装置は、上記のような回路を備えていればよく、シフトレジスタなどの回路、そのような回路を含むアクティブマトリクス基板、表示装置などを広く含む。
図5に示す実施例1の回路は、回路内ダイオード1と、保護用ダイオード20を含む保護回路とを有している。保護用ダイオード20の第1電極およびゲート電極は、回路内ダイオード1のゲート電極に接続された配線3に接続され、保護用ダイオード20の第2電極は、VDD配線に接続されている。また、保護用ダイオード20の第1電極およびゲート電極の配線3に対する接続部を3a、3bとすると、接続部3aおよび接続部3bの間で、回路内ダイオード1の第1電極が配線3と接続されている。回路内ダイオード1の第1電極の配線3に対する接続部を3cとする。
図8に示す実施例4では、回路内ダイオード1の第1電極と配線3とが配線4によって接続されており、この配線4に対して、保護用ダイオード20の第1電極およびゲート電極が接続されている。このように、保護用ダイオード20の第1電極およびゲート電極は、配線3の代わりに、回路内ダイオード1の第1電極と配線3と接続するための配線4に接続されてもよい。実施例4の回路でも、配線3にプラス電荷が入力されると、配線4から保護用ダイオード20を介してVDD配線へ電流が流れるので、回路内ダイオード1に流れ込む電流の量を大幅に低減できる。
図10に示す実施例6の回路は、回路内ダイオード1-gと、回路内ダイオード1-gを保護するための保護回路とを含んでいる。回路内ダイオード1-gのゲート電極は、2つの配線3、3’に接続されている。このように、2以上の配線に接続されたゲート電極を有する構造を「ゲート電極枝分かれ構造」と称する。保護回路は、配線3’から入ってくる静電気から回路内ダイオード1-gを保護するための保護用ダイオード20aと、配線3から入ってくる静電気から回路内ダイオード1-gを保護するための保護用ダイオード20bとを含む少なくとも2つの保護用ダイオードを有している。
図17に示す実施例13の回路は、回路内ダイオード1-sと、回路内ダイオード1-sを保護するための保護回路とを含んでいる。回路内ダイオード1-sの第1電極は、2つの配線4、4’に接続されている。配線4は、回路内ダイオード1-sのゲート電極に接続された配線3に接続されている。このように、2以上の配線に接続された第1電極を有する構造を「第1電極枝分かれ構造」と称する。保護回路は、配線4’から入ってくる静電気から回路内ダイオード1-sを保護するための保護用ダイオード20aと、配線3から入ってくる静電気から回路内ダイオード1-sを保護するための保護用ダイオード20bとを含む少なくとも2つの保護用ダイオードを有している。ここでは、保護用ダイオード20aの第1電極およびゲート電極は、配線4’に接続されている。また、保護用ダイオード20bの第1電極およびゲート電極は、配線3または配線4に接続されている。
実施例15の回路は、回路内ダイオードおよび保護用ダイオードをPチャネル型に変更したこと以外は、図5に示す実施例1の回路と同様の構成を有している。
ここで、回路内ダイオードまたは保護用ダイオードとして用いられる3端子型のダイオードの構成を、Nチャネル型ダイオードを例に説明する。
以下、図面を参照しながら、本発明による半導体装置の第2実施形態を説明する。本実施形態の半導体装置はシフトレジスタである。本実施形態のシフトレジスタは、例えば表示装置のアクティブマトリクス基板に設けられる。
以下、図面を参照しながら、本発明による半導体装置の第3実施形態を説明する。ここでは、図27~図32を参照しながら、本発明における保護回路をシフトレジススタ以外の回路に適用する例を説明する。本実施形態における保護回路の構成および配置(バイアス方向)は、第1および第2実施形態で前述した構成および配置と同様である。なお、一部の図では、保護回路を形成する位置のみを示し、保護回路の構成を省略している。
20 保護用ダイオード(Nチャネル型)
22 保護用ダイオード(Pチャネル型)
MM 回路内ダイオード
1 回路内ダイオード(Nチャネル型)
2 回路内ダイオード(Pチャネル型)
3、8、9 配線
MK、MH、MJ、ML、MN 薄膜トランジスタ
50、60、70、80 シフトレジスタ
52 S信号入力ライン
53 保護回路
61、63 保護回路
Claims (12)
- 基板上に形成され、薄膜ダイオードと、保護用ダイオードを含む保護回路とを含む回路を備えた半導体装置であって、
前記薄膜ダイオードは、
前記基板上に形成され、第1領域と、第2領域と、前記第1領域および前記第2領域の間に位置するチャネル領域とを有する少なくとも1つの半導体層と、
前記チャネル領域と重なるように配置されたゲート電極と、
前記ゲート電極と前記半導体層との間に形成されたゲート絶縁層と、
前記第1領域上に設けられ、前記第1領域および前記ゲート電極に電気的に接続された第1電極と、
前記第2領域上に設けられ、前記第2領域に電気的に接続された第2電極と
を備え、
(a)前記薄膜ダイオードの導電型はN型であり、前記保護用ダイオードのアノード側の電極は、前記薄膜ダイオードの前記ゲート電極または前記第1電極に接続された配線に接続されている、または、(b)前記薄膜ダイオードの導電型はP型であり、前記保護用ダイオードのカソード側の電極は、前記薄膜ダイオードの前記ゲート電極または前記第1電極に接続された配線に接続されており、
前記保護用ダイオードは前記薄膜ダイオードと並列に接続されておらず、
前記保護回路は、前記保護用ダイオードと電流の流れる方向が逆になるように前記配線に接続された他のダイオードを有していない半導体装置。 - 前記保護用ダイオードは、
前記基板上に形成され、第1領域と、第2領域と、前記第1領域および前記第2領域の間に位置するチャネル領域とを有する少なくとも1つの半導体層と、
前記チャネル領域と重なるように配置されたゲート電極と、
前記ゲート電極と前記半導体層との間に形成されたゲート絶縁層と、
前記第1領域上に設けられ、前記第1領域および前記ゲート電極に電気的に接続された第1電極と、
前記第2領域上に設けられ、前記第2領域に電気的に接続された第2電極と
を備える請求項1に記載の半導体装置。 - 前記薄膜ダイオードの半導体層および前記保護用ダイオードの半導体層は、同一の半導体膜から形成されている請求項2に記載の半導体装置。
- 複数の薄膜トランジスタをさらに含み、前記複数の薄膜トランジスタの導電型は前記薄膜ダイオードの導電型と同じであり、前記複数の薄膜トランジスタの半導体層は、前記薄膜ダイオードの半導体層と同一の半導体膜から形成されている請求項1から3のいずれかに記載の半導体装置。
- 前記薄膜トランジスタのゲート電極に接続された配線上には保護回路は設けられていない請求項4に記載の半導体装置。
- 前記回路は、外部から前記回路に信号を入力する入力部または前記回路から外部へ信号を出力する出力部を含んでおり、
前記薄膜ダイオードと前記保護用ダイオードとの間の配線長は、前記入力部または前記出力部と前記保護用ダイオードとの間の配線長よりも小さい請求項1から5のいずれかに記載の半導体装置。 - 前記薄膜ダイオードと前記保護用ダイオードとの間の配線長は1mm以下である請求項6に記載の半導体装置。
- (a)前記薄膜ダイオードの導電型はN型であり、前記保護用ダイオードのアノード側の電極は、前記薄膜ダイオードの前記ゲート電極または前記第1電極に接続された配線に接続されており、
前記保護用ダイオードの前記アノード側の電極がHigh状態のとき、前記保護用ダイオードのカソード側の電極もHigh状態となる請求項1に記載の半導体装置。 - (a)前記薄膜ダイオードの導電型はN型であり、前記保護用ダイオードのアノード側の電極は、前記薄膜ダイオードの前記ゲート電極または前記第1電極に接続された配線に接続されており、
前記保護用ダイオードのカソード側の電極がVDD電源の配線に繋がっている請求項1に記載の半導体装置。 - (b)前記薄膜ダイオードの導電型はP型であり、前記保護用ダイオードのカソード側の電極は、前記薄膜ダイオードの前記ゲート電極または前記第1電極に接続された配線に接続されており、
前記保護用ダイオードの前記カソード側の電極がLow状態のとき、前記保護用ダイオードのアノード側の電極もLow状態となる請求項1に記載の半導体装置。 - (b)前記薄膜ダイオードの導電型はP型であり、前記保護用ダイオードのカソード側の電極は、前記薄膜ダイオードの前記ゲート電極または前記第1電極に接続された配線に接続されており、
前記保護用ダイオードのアノード側の電極がVSS電源の配線に繋がっている請求項1に記載の半導体装置。 - 前記回路はシフトレジスタを含む請求項1から11のいずれかに記載の半導体装置。
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US20120086081A1 (en) | 2012-04-12 |
CN102460711B (zh) | 2014-10-08 |
BRPI1011202A2 (pt) | 2016-03-15 |
EP2442366B1 (en) | 2018-10-17 |
EP2442366A1 (en) | 2012-04-18 |
EP2442366A4 (en) | 2013-06-05 |
CN102460711A (zh) | 2012-05-16 |
RU2011154093A (ru) | 2013-07-20 |
US8598667B2 (en) | 2013-12-03 |
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