CN105609034B - Shift registor - Google Patents

Shift registor Download PDF

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Publication number
CN105609034B
CN105609034B CN201511003223.4A CN201511003223A CN105609034B CN 105609034 B CN105609034 B CN 105609034B CN 201511003223 A CN201511003223 A CN 201511003223A CN 105609034 B CN105609034 B CN 105609034B
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CN
China
Prior art keywords
signal
switch
phase inverter
shift
touch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201511003223.4A
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Chinese (zh)
Other versions
CN105609034A (en
Inventor
洪凱尉
杨创丞
陈勇志
黄正翰
张翔昇
塗俊达
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AU Optronics Corp
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AU Optronics Corp
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Filing date
Publication date
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Publication of CN105609034A publication Critical patent/CN105609034A/en
Application granted granted Critical
Publication of CN105609034B publication Critical patent/CN105609034B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2092Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11CSTATIC STORES
    • G11C19/00Digital stores in which the information is moved stepwise, e.g. shift registers
    • G11C19/28Digital stores in which the information is moved stepwise, e.g. shift registers using semiconductor elements

Abstract

The invention discloses a kind of shift registors, suitable for being embedded in a kind of Touch Screen.Shift registor includes shift logical circuit, the first phase inverter, first switch, the second phase inverter and reset circuit.First phase inverter couples shift logical circuit.First switch couples the first phase inverter.Second phase inverter couples the first phase inverter.Reset circuit couples second phase inverter.Shift logical circuit generates shift signal according to clock signal, input signal and strangulation signal.First phase inverter generates strangulation signal according to shift signal.First switch adjusts the current potential of strangulation signal to the first reference voltage according to touch-control enable signal.Second phase inverter corresponds to the output signal of strangulation signal to be generated when being enabled.Reset circuit adjusts the current potential of output signal to the first reference voltage according to touch-control enable signal.

Description

Shift registor
Technical field
The present invention is about a kind of shift registor, especially a kind of shift registor applied to embedded touch control panel.
Background technology
Based on considering for manufacturing cost and narrow frame effect is reduced, panel factory gradually starts to drive using grid on array now Dynamic circuit (GOA, gate driver on array) technology.GOA technologies are direct by shift scratch circuit using manufacture of semiconductor It is produced on the glass substrate of panel, and multiple gate drive signals is exported in order using the shift registor of multiple concatenations, With the pel array of driving panel.
And for embedded (in-cell) touch panel, embedded touch control panel is set simultaneously on same substrate It is equipped with gate driving circuit and touch-control circuit, it is clear that gate driving circuit is worked as with touch-control circuit can cause each other in a way Interference.Since the intensity of gate drive signal is stronger, via the capacitance coupling effect in structure, gate drive signal is often It forms noise and interferes touch control detection signal.In the case of even worse, touch control detection signal can also be done by gate drive signal It disturbs and generates erroneous judgement.
And happened in order to avoid such, it in general can be in enable touch-control circuit, it will be in shift registor Several signal specifics are pulled low to low level, interfering with each other with touch-control circuit to avoid gate driving circuit.But simultaneously, how Allow gate driving circuit is enabled in touch-control circuit this during later can rapidly normal operation again, then exist as engineer Design big project when shift registor.
Invention content
The invention reside in a kind of shift registor is provided, it can also allow displacement temporary in the multiple signals for dragging down shift registor Specific node in storage maintains desired voltage, during this to allow shift registor is enabled in touch-control circuit after, It can rapidly normal operation again.
Disclosed herein a kind of shift registor, suitable for being embedded in a kind of Touch Screen.Shift registor includes to move Bit logic circuit, the first phase inverter, first switch, the second phase inverter and reset circuit.First phase inverter couples logic with shift electricity Road.First switch couples the first phase inverter.Second phase inverter couples the first phase inverter.Reset circuit couples second phase inverter. Shift logical circuit generates shift signal according to clock signal, input signal and strangulation signal.First phase inverter is believed according to displacement Number generate strangulation signal.First switch adjusts the current potential of strangulation signal to the first reference voltage according to touch-control enable signal.The Two phase inverters correspond to the output signal of strangulation signal to be generated when being enabled.Reset circuit foundation touch-control enable signal, The current potential of output signal is adjusted to the first reference voltage.
In conclusion disclosed herein a kind of shift registor, by time at least one in shift registor The output node or input node of a phase inverter carry out charge and discharge, in the multiple input signal or output for dragging down shift registor Also the output of the phase inverter or input node can be allowed to maintain desired voltage when signal, to allow shift registor in touch-control Circuit be enabled this during after, can rapidly normal operation again.
The explanation of above explanation and the following embodiments and the accompanying drawings about the content of present invention is demonstrating and explain the present invention Spirit and principle, and provide the present invention patent claim further explain.
Description of the drawings
Fig. 1 is the function block schematic diagram of the gate driving circuit depicted in one embodiment of the invention.
Fig. 2 is the circuit diagram of the shift registor depicted in one embodiment of the invention.
Fig. 3 is the time diagram of the shift registor depicted in Fig. 2 of the present invention.
Fig. 4 is the circuit diagram of the shift registor depicted in another embodiment of the present invention.
Fig. 5 is the circuit diagram of the shift registor depicted in a more embodiment of the invention.
Fig. 6 is the circuit diagram of the shift registor depicted in yet another embodiment of the invention.
Wherein, reference numeral:
1 gate driving circuit
10_1~10_4 shift registors
102 shift logical circuits
104 first phase inverters
106 first switches
108 second phase inverters
110,110 ' reset circuit
112 enables switch
114 third phase inverters
116 the 4th phase inverters
Third switchs
CK (1)~CK (4) clock signal
G (2), G (3) shift signal
K (3) strangulation signal
Q (2), Q (3) control signal
TP_EN touch-control enable signals
~TP_EN touch-control enable inversion signals
T1~T21 transistors
T11 pull-up switch
T12 pulls down switch
T1, t2 time point
SR (1)~SR (4) gate drive signal
The second reference voltages of VGH
The first reference voltages of XDONB
Specific implementation mode
The detailed features and advantage of the narration present invention in detail in embodiments below, content are enough to make any to be familiar with Relevant art understand the present invention technology contents simultaneously implement according to this, and invented according to this specification content, apply for a patent Range and schema, it is any to be familiar with relevant art and be readily understood upon the relevant purpose of the present invention and advantage.Embodiment below The viewpoint that present invention be described in more detail, but it is non-anyways to limit scope of the invention.
Fig. 1 is please referred to, Fig. 1 is the function block signal of the gate driving circuit depicted in one embodiment of the invention Figure.There is gate driving circuit 1 shift registor 10_1~10_4, shift registor 10_1~10_4 sequentially to concatenate.With displacement For for buffer 10_1,10_2, shift registor 10_1 generates gate drive signal SR (1) according to clock signal CK (1). And shift registor 10_2 generates gate drive signal SR (2) according to clock signal CK (2) and gate drive signal SR (1).Extremely In the related start of shift registor 10_3,10_4 when can from the discussion above, in this, it is no longer repeated.It is chatted to ask Simplicity is stated, has only been painted shift registor 10_1~10_4 in Fig. 1 to illustrate, but herein not to gate driving circuit The 1 shift registor quantity that can have limits.The explanation in its structure is carried out with shift registor 10_3 below, and is moved Position buffer 10_1~10_2, the structure of 10_4 and shift registor 10_3 are similar, therefore it will not go into details in this.
It is please the circuit diagram of the shift registor depicted in one embodiment of the invention referring next to Fig. 2, Fig. 2. Shift registor 10_3 is suitable for being embedded in a kind of Touch Screen.Shift registor 10_3 includes that shift logical circuit 102, first is anti- Phase device 104, first switch 106, the second phase inverter 108 and reset circuit 110.First phase inverter 104 is electrically connected logic with shift Circuit 102.First switch 106 is electrically connected the first phase inverter 104.Second phase inverter 108 is electrically coupled to the first phase inverter 104.Reset circuit 110 is electrically connected to the second phase inverter 108.In this embodiment, reset circuit 110 is transistor T21.And First phase inverter 104 includes pull-up switch T11 and the T12 that pulls down switch.In fact, the shift registor 10_3 depicted in Fig. 2 is only It demonstrates for citing, each module or unit are not limited merely to the state sample implementation depicted in Fig. 2, all in similar similar to having in sequential Function person all belongs to the scope of this case.
Shift logical circuit 102 generates shift signal G according to clock signal CK (3), input signal and strangulation signal K (3) (3).In this embodiment, input signal is gate drive signal SR (2), but is not limited thereto.First phase inverter, 104 foundation Shift signal G (3) generates strangulation signal K (3).First switch 106 is according to touch-control enable signal TP_EN by strangulation signal K's (3) Current potential is adjusted to the first reference voltage XDONB.Second phase inverter 108 corresponds to strangulation signal K (3) to be generated when being enabled Output signal.Reset circuit 110 is according to touch-control enable signal TP_EN, the current potential of adjustment gate drive signal SR (3) to first Reference voltage XDONB.
More specifically, when 1 normal operation of gate driving circuit, the voltage of gate drive signal SR (1)~SR (4) Level can sequentially be pulled to high potential.For shift registor 10_2,10_3, shift registor 10_2 is first by gate driving The voltage level of signal SR (2) is drawn high to a transient state current potential, and transistor T1, T2 are thus connected, the voltage electricity of control signal Q (3) It is flat thus be raised, then transistor T8 because current potential increase after control signal Q (3) and be connected.
Then, gate drive signal SR (2) is pulled low to low potential, and transistor T1, T2 are not turned on.At this point, clock signal CK (3) is changed into high potential, and transistor T8 still maintains conducting state.Shift signal G (3) via transistor T8 guiding path With the short circuit paths of transistor T9 and as clock signal CK (3) is pulled to high potential.Due to circuit wiring pattern, transistor T9 can also be taken as capacitance to use, therefore when shift signal G (3) is raised with clock signal CK (3), due to transistor T9 Capacitance coupling effect, control signal Q (3) jointly pushed away to obtain higher, and shift signal G (3) made to be pulled to again such as Fig. 3 institutes The current potential shown.Then, shift signal G (3) is inverted into strangulation signal K (3) via the first phase inverter 104, and strangulation signal K (3) is again It is inverted into gate drive signal SR (3) and is exported by the second phase inverter 108.And when clock signal CK (3) is pulled low by high potential For low potential when, gate drive signal SR (3) is also jointly pulled low as low potential.Wherein, first switch 106 is controlled by touch-control Enable signal TP_EN and the conduction impedance that is connected are less than pull-up switch T11 and are controlled by shift signal G (3) and the conducting resistance that is connected It is anti-.
And as shown in Fig. 2, shift registor 10_3 also has enable switch 112.Enable switch 112 is electrically connected to second Phase inverter 108, and according to gate drive signal SR (2) selectively the second phase inverters of enable 108.In this embodiment, enable Switch 112 is P type metal oxide semiconductor field-effect transistor, and control terminal receives gate drive signal SR (2).When grid drives When dynamic signal SR (2) is low voltage level, enable switch 112 is switched on and the second phase inverter of enable 108.
When the touch-control scanning to be carried out of the touch-control circuit of embedded touch control panel, clock signal CK (3), the first reference voltage XDONB and the second reference voltage VGH are pulled low to low potential, so that the pause a period of time of gate driving circuit 1, touch-control circuit Touch-control scanning is then carried out in this time.Please with reference to Fig. 3 with illustrate shift registor 10_3 touch-control display panel into Make flowing mode when row touch-control scans, Fig. 3 is the time diagram of the shift registor depicted in Fig. 2 of the present invention.
As shown in figure 3, before time point t1, gate driving circuit 1 normally operates, therefore controls signal Q (2) and drawn Up to high potential, and shift signal G (2) is jointly pulled to high potential due to (2) signal Q in order to control, and control letter at this time Number Q (3) is pulled to transient state current potential.And since in time point t1, touch-control circuit proceeds by touch control detection, clock signal CK (3) it is pulled low to low potential, and touch-control enable signal TP_EN is pulled to high potential.At this point, since clock signal CK (3) is Low potential, shift signal G (3) can not jointly be drawn high via transistor T8, T9 by clock signal CK (3), therefore control signal Q (3) high potential can not be adjusted to by capacitance coupling effect above-mentioned, to no decree shift signal G (3) be adjusted it is supreme Current potential.
At this point, first switch 106 is connected because of the touch-control enable signal TP_EN of high potential, strangulation signal K (3) is drawn It is unlikely to down to low potential via transistor T3 conducting transistors T5, T6, T7.And reset circuit 110 is also according to high potential Touch-control enable signal TP_EN the current potential of grid touching signals SR (3) is adjusted to the first reference voltage XDONB.It is event, by Above-mentioned start, in time point t1 between time point t2, gate drive signal SR (3) and other shift registors generate Gate drive signal be adjusted to low potential, without interfere with touch-control circuit carry out touch control detection.
Other than state sample implementation as described in Figure 2, shift registor 10_3 can also have following several state sample implementations.
Fig. 4 is please referred to, Fig. 4 is the circuit diagram of the shift registor depicted in another embodiment of the present invention. In embodiment corresponding to Fig. 4, reset circuit 110 ' is a multiplexer.The first input end of reset circuit 110 ' is electrically connected to Second reference voltage VGH.Second input terminal of reset circuit 110 ' is electrically connected to the output end of the first phase inverter 104.Resetting The selection signal end of circuit 110 ' is receiving touch-control enable signal TP_EN.The output end of reset circuit 110 ' is electrically connected the The input terminal of two phase inverters 108.Reset circuit 110 ' is selectively exported according to the current potential height of touch-control enable signal TP_EN Second reference potential VGH or the strangulation signal of the first phase inverter 104 output.In one embodiment, as touch-control enable signal TP_EN For low level when, reset circuit 110 ' exports gate drive signal according to the second reference voltage VGH, and works as touch-control enable signal When TP_EN is high level, reset circuit 110 ' exports gate driving according to the strangulation signal K (3) of the first phase inverter 104 output Signal.Also that is, in another embodiment, reset circuit 110 ' according to the touch-control enable signal TP_EN of reverse phase current potential height and Selectively export the second reference voltage VGH or the strangulation signal of the first phase inverter 104 output.
Fig. 5 is please referred to, Fig. 5 is the circuit diagram of the shift registor depicted in a more embodiment of the invention. In embodiment corresponding to Fig. 5, shift registor 10_3 has more third phase inverter 114 and the 4th phase inverter 116.Third reverse phase Device 114 is electrically connected at the output end of the second phase inverter 108.4th phase inverter 116 is electrically connected at the defeated of third phase inverter 114 Outlet.In addition.
In embodiment corresponding to Fig. 5, shift registor 10_3 more may include third switch 118.118, third switch Such as it is transistor T22.The first end of third switch 118 is electrically connected at the output end of third phase inverter 114, third switch 118 Second end be electrically connected at the second reference voltage VGH, touch-control cause of the third switch 118 according to the control terminal of third switch 118 Can inversion signal~TP_EN, it is selective to be established between the first end and the second end of third switch 118 of third switch 118 Current path.Wherein, the transistor T22 of third switch 118 is, for example, P type metal oxide semiconductor field-effect transistor (metal Oxide semiconductor field effect transistor, MOSFET) or N-type metal oxide semiconductcor field effect Transistor.And with the type of transistor T22 difference, transistor T22 is according to touch-control enable signal TP_EN or touch-control enable reverse phase Signal~TP_EN and be connected.This has usually intellectual for technical field and can freely be designed after readding this specification in detail, This is not limited.
Fig. 6 is please referred to, Fig. 6 is the circuit diagram of the shift registor depicted in yet another embodiment of the invention.Phase Compared with Fig. 5, as shown in fig. 6, in fact shift registor 10_3 can not have transistor T21 yet.
In summary, disclosed herein a kind of shift registor, it is in time temporary to shifting by a switching circuit The output node or input node of at least one of storage phase inverter carry out charge and discharge, in order not to interfering embedded touch Panel carries out touch-control scanning when dragging down the multiple input signal or output signal of shift registor, can also allow described at least one The output of a phase inverter or input node maintain desired voltage.Thereby, in addition to allowing shift registor in embedded touch control panel It carries out except will not being malfunctioned in a period of touch-control scanning, is also able to that shift registor is allowed in embedded touch control panel to terminate It, can rapidly normal operation again after touch-control scanning.
Although the present invention is disclosed above with embodiment above-mentioned, however, it is not to limit the invention.This hair is not being departed from In bright spirit and scope, carried out by change and retouch, belong to the present invention scope of patent protection.It is defined about the present invention Protection domain please refers to appended claim.

Claims (7)

1. a kind of shift registor, which is characterized in that suitable for being embedded in a kind of Touch Screen, the shift registor includes:
One shift logical circuit generates a shift signal according to a clock signal, an input signal and a strangulation signal;
One first phase inverter, is electrically connected the shift logical circuit, and the strangulation signal is generated according to the shift signal;
One first switch is electrically connected first phase inverter, adjusts the current potential of the strangulation signal according to a touch-control enable signal To one first reference voltage;
One second phase inverter is electrically coupled to first phase inverter, to be generated corresponding to the strangulation signal when being enabled One output signal;And
One reset circuit is electrically connected to second phase inverter, according to the touch-control enable signal, adjusts the current potential of the output signal To first reference voltage.
2. shift registor according to claim 1, which is characterized in that the reset circuit is a second switch, this second Switch is electrically connected at second reverse phase with a first end, a second end and a control terminal, the first end of the second switch The output end of device, the second end of the second switch are electrically connected at first reference voltage, the second switch according to this second The touch-control enable signal of the control terminal of switch, selective first end in the second switch should with the second switch Current path is established between second end.
3. shift registor according to claim 1, which is characterized in that the reset circuit is a multiplexer, the multiplexer Including:
One first input end is electrically connected to one second reference voltage;
One second input terminal, is electrically connected to the output end of first phase inverter;
One selection signal end, to receive a touch-control enable inversion signal;And
One output end is electrically connected the input terminal of second phase inverter.
4. shift registor according to claim 1 or 2, which is characterized in that further include:
One third phase inverter, is electrically connected at the output end of second phase inverter;And
One the 4th phase inverter, is electrically connected at the output end of the third phase inverter.
5. shift registor according to claim 4, which is characterized in that further include third switch, third switch tool There are a first end, a second end and a control terminal, the first end of third switch to be electrically connected at the defeated of the third phase inverter The second end of outlet, third switch is electrically connected at one second reference voltage, and third switch is switched according to the third The touch-control enable signal of the control terminal, the second end of selective first end in third switch and third switch Between establish current path.
6. the shift registor according to one of claims 1 to 3, which is characterized in that first phase inverter includes one Pull-up switch pulls down switch with one, and the conduction impedance that the first switch is controlled by the touch-control enable signal and is connected is less than on this Drag switch is controlled by the shift signal and the conduction impedance that is connected.
7. the shift registor according to one of claims 1 to 3, which is characterized in that further include enable switch, electricity Property is connected to second phase inverter, according to the input signal selectively enable second phase inverter.
CN201511003223.4A 2015-11-04 2015-12-28 Shift registor Expired - Fee Related CN105609034B (en)

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TW104136346 2015-11-04
TW104136346A TWI576738B (en) 2015-11-04 2015-11-04 Shift register

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TWI602168B (en) * 2016-11-28 2017-10-11 友達光電股份有限公司 Shift register and timimg control method thereof
TWI646779B (en) * 2017-07-21 2019-01-01 義隆電子股份有限公司 Processing circuit of reset signal
TWI637371B (en) * 2017-12-28 2018-10-01 友達光電股份有限公司 Shift register circuit
TWI709886B (en) * 2019-05-02 2020-11-11 友達光電股份有限公司 Touch and display device
JP2022000833A (en) * 2020-06-19 2022-01-04 凸版印刷株式会社 Shift register, and display device

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CN105609034A (en) 2016-05-25
TW201716944A (en) 2017-05-16

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