CN104077996A - Gate drive circuit and display panel and display device comprising same - Google Patents
Gate drive circuit and display panel and display device comprising same Download PDFInfo
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- CN104077996A CN104077996A CN201410322865.XA CN201410322865A CN104077996A CN 104077996 A CN104077996 A CN 104077996A CN 201410322865 A CN201410322865 A CN 201410322865A CN 104077996 A CN104077996 A CN 104077996A
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Abstract
The invention provides a gate drive circuit of a display panel with a self-capacitance touch function. The drive circuit comprises a driving unit and a modulation unit. The driving unit is used for receiving multiple input signals, generating a first gate signal and outputting the first gate signal. The modulation unit comprises a control end, a first input end, a second input end and an output end, wherein the first input end is used for receiving the first gate signal; the second input end is used for receiving a modulating signal; the control end is used for receiving a control signal; the output end is used for outputting a second gate signal. The modulation unit determines whether to modulate the first gate signal through the modulating signal according to the received control signal and outputs the second gate signal to reduce a self-capacitance load. The invention further provides the display panel and a display device comprising the gate drive circuit. By the adoption of the gate drive circuit, influences of stray capacitance of the display panel or the display device on the display panel or the display device are reduced, and the performance of the display panel and the display device is improved.
Description
Technical field
The present invention relates to touch-control field, relate in particular to a kind of band from holding the gate driver circuit of display panel of touch controllable function and display panel thereof, display device.
Background technology
Current, in display panel field, with the display panel of touch controllable function, more and more become main flow and shown product, there is the integration mode of various display panels and contact panel, be of a great variety, for example outer formula (oncell) of embedded (incell), box and external hanging type.On the other hand, if classify from principle of work, with the display panel of touch controllable function, can roughly be divided into condenser type, resistance-type, infrared type etc. again, wherein capacitance type touch control display panel mainly comprises again two types of self-capacitance formula and mutual capacitance types.The touch-control display panel of every type is each have their own Pros and Cons all.For example, the embedded display panel based on self-capacitance is arranged on the electrode for touch-control the inside of display panel outermost layer substrate conventionally, thereby integral thickness is less, more frivolous.
Yet, in actual use, because touch-control electrode is arranged in display panel.Therefore the distance between other electrodes in touch-control electrode and display panel is nearer, that is to say, therefore the unnecessary stray capacitance for example, producing between touch-control electrode and other electrodes (grid) also becomes large.Conventionally, for reducing the thickness of display panel, public electrode is multiplexed with to touch-control electrode.As shown in Figure 1, common electrode layer is divided into a plurality of fritters, and when needs are realized touch controllable function, each fritter is received or sent touching signals by cabling, realize touch controllable function; When needs are realized common electrode layer, each fritter receives common electric voltage according to demand, as common electrode layer.Therefore, for example, stray capacitance between touch-control electrode (being also public electrode) and other electrode (grid) increases, and the load capacitance that is equivalent to self-capacitance has increased, and affects the overall performance of touch-control electrode.
It in prior art, is a kind of load of self-capacitance that reduces touch-control display panel; reduce the stray capacitance that touch-control electrode (public electrode) and grid form; conventionally can be from the position of public electrode, the angle of rete, consider, general technology method is by solving the excessive problem of stray capacitance forming between public electrode and grid forming specific structure between public electrode and grid.Sometimes, also can by merge processing step or jointly certain specific film layer structure reach under the prerequisite that does not increase by one light shield technique, reduce the stray capacitance forming between public electrode and grid.Industry is for such technical matters, the technical standpoint of conventionally taking be all confined to the structure of electrode or technique is made itself.
Inventor has passed through deep thinking, jumps out the inertial thinking of original thoughtcast and industry, off the beaten track, from another angle, has proposed a kind of technical scheme, to solving this technical problem.This is started with and a little itself has broken away from conventional art personnel's inertial thinking, has novelty.
In the touch-control display panel of self-capacitance formula, can whether change by detecting the self-capacitance (being also ground capacitance) of touch-control electrode (common electrode layer), judge whether current location has touch.But in actual touch-control display panel, having various stray capacitances, is wherein the stray capacitance forming between touch-control electrode (public electrode) and grid than major stray capacitance.Fig. 2 is its equivalent schematic diagram, and in Fig. 2, public electrode com and ground have formed self-capacitance C between GND, simultaneously public electrode com also can and grid gate between form stray capacitance Cjs, and this stray capacitance Cjs has formed noise to self-capacitance C undoubtedly.After inventor's research, think, if the electromotive force of the two poles of the earth A of stray capacitance Cjs and B is consistent, so described stray capacitance Cjs just can equivalence be considered as not existing, so just can be in the situation that additionally not adding one deck organic film, effectively reduce the stray capacitance of public electrode com to grid gate, also reduce the load capacitance of touch-control electrode.
Concrete, can be at described touch-control display panel for realizing in the time cycle of touch controllable function, apply an electric signal the same with the touching signals carrying with touch-control electrode to described grid gate, make the two poles of the earth A of described stray capacitance Cjs the same with the electromotive force of B, can make realizing in the time cycle of described touch controllable function, described stray capacitance Cjs equivalence is considered as not existing, thereby reduces the load of self-capacitance.Therefore, apply an electric signal need to corresponding gate driver circuit (for example ASG, amorphoussilicongate), realize in the time cycle of touch controllable function, allow described gate driver circuit export the electric signal same with described touching signals.
Below by different implementations, be specifically described.
Summary of the invention
Technical matters to be solved by this invention is how can reduce the self-capacitance load of described touch-control display panel and not increase processing step.
For overcoming the above problems, the invention provides a kind of gate driver circuit, for rotating band, from the display panel that holds touch controllable function, described driving circuit comprises: driver element, described driver element is used for receiving a plurality of input signals, generates and export first grid signal; Modulating unit, comprises control end, first input end, the second input end and output terminal; Wherein, described first input end receives described first grid signal, and described the second input end receives modulation signal, described control end reception control signal, described output terminal output second grid signal; Whether described modulating unit is selected by described modulation signal, described first grid signal to be modulated according to the control signal receiving, and exports second grid signal, to reduce the described load from holding.
Preferably, described modulating unit, when described control signal is effective, outputs to described modulation signal the output terminal of described modulating unit, as second grid signal.
Preferably, described modulating unit comprises a thin film transistor (TFT), the control end of described modulating unit is the grid of described thin film transistor (TFT), the first input end of described modulating unit couples the output terminal of described modulating unit, first utmost point that the second input end of described modulating unit is described thin film transistor (TFT), second utmost point of described thin film transistor (TFT) is coupled to the output terminal of described modulating unit.
Preferably, described modulating unit comprises gating circuit and adding circuit, described gating circuit receives described control signal by the control end of described modulating unit, the second input end by described modulating unit receives described modulation signal, and when described control signal is effective, described modulation signal is exported to described adding circuit; Described adding circuit receives described first grid signal by the first input end of described modulating unit, and modulation signal and the described first grid signal of described gating circuit output are superposeed, and export described second grid signal by the output terminal of described modulating unit.
Preferably, described gating circuit is thin film transistor (TFT), the grid of described thin film transistor (TFT) is the control end of described modulating unit, the second input end of the first very described modulating unit of described thin film transistor (TFT), second utmost point of described thin film transistor (TFT) is coupled to a signal input part of described adding circuit.
The present invention also provides a kind of display panel, comprise first substrate and the second substrate arranging corresponding thereto, wherein said first substrate comprises above-mentioned arbitrary gate driver circuit and grid, described display panel also comprises the touch control electrode layer being positioned on described first substrate or described second substrate, and described touch control electrode layer and described grid form stray capacitance.
Preferably, described touch control electrode layer is common electrode layer, and described common electrode layer comprises a plurality of independently public electrode pieces, and described in each, public electrode piece receives or send touching signals by the cabling being electrically connected to it.
Preferably, described first substrate is tft array substrate, and described display panel comprises successively along printing opacity direction: grid layer, and described grid layer comprises the grid of described TFT and the gate line being electrically connected to it; Active layer; Source-drain electrode layer, source electrode and drain electrode that described source-drain electrode layer comprises described TFT, and the data line being electrically connected to described source electrode; Insulation course; Described common electrode layer; Planarization layer; And pixel electrode layer, comprising a plurality of pixel electrodes, the drain electrode of described TFT is electrically connected to a pixel electrode.
Preferably, drive the frame time periodic packets of gate driver circuit of described display panel containing during showing and during touch-control, wherein:
During described demonstration, described gate driver circuit is exported described second grid signal, realizes the Presentation Function of described display panel, and described control signal is invalid;
During described touch-control, described gate driver circuit is exported described second grid signal, realizes the touch controllable function of described display panel, and described control signal is effective.
Preferably, during described touch-control in, described second grid signal is consistent with described touching signals.
The present invention also provides a kind of display device, comprises above-mentioned arbitrary described display panel.
Adopt band of the present invention from the gate driver circuit, display panel, display device that hold the display panel of touch controllable function in the situation that not increasing processing step, can reduce the self-capacitance load (stray capacitance) of described touch-control display panel, make the performance of described touch-control display panel better.
Accompanying drawing explanation
Fig. 1 is that a kind of common electrode layer is as the schematic diagram of touch-control electrode;
Fig. 2 is the equivalent circuit diagram of self-capacitance;
Fig. 3 is the gate driver circuit schematic diagram of the embodiment of the present invention one;
Fig. 4 is the sequential chart of described touching signals and second grid signal;
Fig. 5 is the schematic diagram of the gate driver circuit of embodiment bis-;
Fig. 6 a and Fig. 6 b are the schematic diagram of the gate driver circuit of embodiment tri-;
Fig. 7 is the schematic diagram of driver element described in the embodiment of the present invention;
Fig. 8 a be embodiment tetra-display panel overlook equivalent schematic;
Fig. 8 b is the partial cutaway schematic of irising out part in Fig. 8 a;
Fig. 9 is the first grid signal of gate driver circuit of the embodiment of the present invention and the sequential chart of control signal.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Set forth in the following description a lot of details so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here, implement, so the present invention has not been subject to the restriction of following public specific embodiment.
Embodiment mono-
The present embodiment provides a kind of band from the gate driver circuit that holds the display panel of touch controllable function, and as shown in Figure 3, described driving circuit comprises: driver element 11, for receiving a plurality of input signal Si n, generates and export first grid signal S1; Modulating unit 12, comprises control end 120, first input end 121, the second input end 122 and output terminal 123; Wherein, first input end 121 receives first grid signal S1, and the second input end 122 receives modulation signal Sa, control end 120 reception control signal Sc, output terminal 123 output second grid signal S2.Whether modulating unit 12 is selected by modulation signal Sc, first grid signal S1 to be modulated according to the control signal Sc receiving, and exports second grid signal S2, to reduce the described load from holding.
Wherein, first grid signal S1 is the original gate drive signal that the various signals that receive according to gate driver circuit generate, and in there is no the display panel of integrated touch controllable function, first grid signal S1 can be directly used in and drive each gate line.Second grid signal S2 can be consistent with the touching signals that described band provides from the display panel that holds touch controllable function, and " unanimously " described here comprises that these two signals have identical waveform, frequency, amplitude, phase place.Also can be understood as in described display panel is realized the time of described touch controllable function, any time, the voltage of these two signals (comprising voltage swing, voltage-phase etc.) is all identical.For example, in described display panel need to be realized the time of touch controllable function, as shown in Figure 4, the drive cycle of described gate line can be divided into first period T1 and second phase T2, in first period T1, the touch-control electrode of described band in the display panel that holds touch controllable function sends driving signal, and described touch-control electrode is recharged; In second phase T2, the touch-control electrode of described band in the display panel that holds touch controllable function receives detection signal, and described touch-control electrode discharges.For example, so corresponding, within described first period, second grid signal S2 can the waveform in first period T1, amplitude etc. be consistent with described touching signals Stp, are high level; In described second phase T2, also the waveform in second phase T2, amplitude etc. are consistent with described touching signals Stp for second grid signal S2, for example, be low level.
Like this, because the voltage on the grid in described display panel is consistent with the voltage on described touch-control electrode, therefore the two-stage electromotive force in described stray capacitance equates, so described stray capacitance can equivalence be considered as not existing, thereby reduced the load of self-capacitance, made described band better from the performance of display panel of holding touch controllable function.In addition, prior art is in order to reduce the load of self-capacitance, conventionally take increases one deck organic film between grid and touch-control electrode, and the embodiment of the present invention has reduced the impact of the stray capacitance of described display panel greatly, even if therefore additionally do not increase this layer of organic film, also it doesn't matter, thereby simplified process complexity.
It should be noted that, the control signal Sc here and modulation signal Sa be what signal specifically, does not limit.As long as can realize in the effective situation of control signal Sc, can make modulating unit 12 can export the second grid signal S2 consistent with described touching signals Stp by modulation signal Sa.Those skilled in the art can be according to grasped technical know-how, correspondingly takes specific circuit to realize the function of described modulating unit.Understanding about second grid signal S2 with described touching signals Stp " consistent ", with reference to discussing above.
Optionally, modulating unit 12, when described control signal Sc is effective, can directly output to modulation signal Sa the output terminal 123 of modulating unit 12, as second grid signal S2.
Embodiment bis-
The present embodiment is a kind of refinement to embodiment mono-.
Concrete, as shown in Figure 5, modulating unit 12 can comprise a thin film transistor (TFT) 124, the control end 120 of modulating unit 12 is the grid of thin film transistor (TFT) 124, the first input end 121 of modulating unit 12 couples the output terminal 123 of modulating unit 12, the second input end 122 of modulating unit 12 is first utmost point of thin film transistor (TFT) 124, and second utmost point of thin film transistor (TFT) 124 is coupled to the output terminal 123 of modulating unit 12.Wherein, both coupled and can represent direct electrical connection, also can represent that Indirect Electro connected.
Here, first utmost point of thin film transistor (TFT) 124 and second utmost point are respectively its source electrode and drain electrode, specifically which be source electrode which be drain electrode depend on that the type of thin film transistor (TFT) 124 is P type or N-type, at this, do not limit.Therefore, for N-type thin film transistor (TFT) (thin film transistor, TFT), when control signal Sc is high level, Sc is useful signal, and thin film transistor (TFT) 124 is opened, and modulation signal Sa can import the output terminal 123 to modulating unit 12 into by thin film transistor (TFT) 124; When control signal Sc is low level, Sc is invalid signals, and thin film transistor (TFT) 124 turn-offs, and modulation signal Sa cannot import the output terminal 123 to modulating unit 12 into.In like manner, for P type thin film transistor (TFT), when control signal Sc is low level, Sc is useful signal, and thin film transistor (TFT) 124 is opened, and modulation signal Sa can import the output terminal 123 to modulating unit 12 into by thin film transistor (TFT) 124; When control signal Sc is high level, Sc is invalid signals, and thin film transistor (TFT) 124 turn-offs, and modulation signal Sa cannot import the output terminal 123 to modulating unit 12 into.
When control signal Sc is invalid, thin film transistor (TFT) 124 turn-offs, now first grid signal S1 can be directly by output terminal 123 outputs of modulating unit 12 after entering the first input end 121 of modulating unit 12, become second grid signal S2, thereby drive described gate line, make described band can realize normally Presentation Function from the display panel that holds touch controllable function.When the control signal Sc of modulating unit 12 is effective, can directly modulation signal Sa be outputed to the output terminal 123 of modulating unit 12, as second grid signal S2, now because second grid signal S2 is consistent with the touching signals Stp on described touch-control electrode, therefore can be so that the stray capacitance Cjs equivalence in Fig. 2 be considered as not existing, thus the load of self-capacitance reduced.
Hence one can see that, and modulation signal Sa will output to the output terminal 123 of modulating unit 12 by thin film transistor (TFT) 124, with first grid signal S1 acting in conjunction, forms second grid signal S2.Therefore can be according to parameters such as the waveform of the second grid signal S2 that wants to obtain, frequency, amplitude, phase places, each parameters such as the waveform of setting modulation signal Sa, frequency, amplitude, phase place, to guarantee in any time of realizing touch controllable function.For example, realizing in the time of touch controllable function, in a certain moment, the output voltage of first grid signal S1 is-10V, and now need the voltage of the second grid signal S2 of output, is-6V, and so just can set the voltage that the modulation signal Sa in this moment exports is 4V.Certainly, be only to give an example with voltage signal here, in fact other electric signal such as current signal may be used to generate required second grid signal S2, at this, its specific works mode, numerical value etc. are not limited.
Embodiment tri-
The present embodiment is also a kind of concrete refinement to embodiment mono-.
As shown in Figure 6 a, modulating unit 12 can further specifically comprise gating circuit 125 and adding circuit 126, gating circuit 125 is by the control end 120 reception control signal Sc of modulating unit 12, and receive modulation signal Sa by the second input end 122 of modulating unit 12, and when control signal Sc is effective, modulation signal Sa is exported to adding circuit 126.Adding circuit 126 receives first grid signal S1 by the first input end 121 of modulating unit 12, and modulation signal Sa and the first grid signal S1 of gating circuit 12 outputs are superposeed, and by the output terminal 123 output second grid signal S2 of modulating unit 12.
The present embodiment has provided a kind of optional structure of concrete modulating unit 12, to realize when described display panel need to be realized touch controllable function, to first grid signal, S1 modulates, and to export the second grid signal S2 suiting the requirements, thereby reduces the load of self-capacitance.Concrete effect is similar to the effect of embodiment bis-, can use for reference understanding.
Preferably, gating circuit 125 can be thin film transistor (TFT), as shown in Figure 6 b, the grid of thin film transistor (TFT) 125 is the control end 120 of modulating unit 12, first the second input end 122 of modulating unit 12 very of thin film transistor (TFT) 125, second utmost point of thin film transistor (TFT) 125 is coupled to a signal input part of adding circuit 126.The first grid signal S1 that adding circuit 126 receives by stack and from the modulation signal Sa of thin film transistor (TFT) 125, output second grid signal S2 is to output terminal 123, for in described display panel is realized the time of touch controllable function, give electric signal of corresponding grid, stray capacitance Cjs shown in Fig. 2 is equivalent to and does not exist, thereby reduce the load of self-capacitance.
It should be noted that, in all embodiment of the present invention, described driver element is for generating first grid signal S1 according to various input signals, and described driver element can be ASG circuit.Fig. 7 has provided a kind of concrete structure of ASG circuit, visible described driver element can comprise a plurality of input signals, such as the first clock signal clk, second clock signal CLKB, initial level STV, reset signal Reset, first signal DIR1, secondary signal DIR2 etc., these input signals are unified in the above-described embodiments to be represented by input signal Si n; And, the concrete structure of described driver element is not described in detail in above embodiment yet, Fig. 7 has provided a kind of 9T1C, and (T represents transistor, C represents electric capacity) ASG circuit connection structure, those skilled in the art can, according to existing knowledge, easily learn 7T1C, 7T2C, 8T1C, 8T2C ... the concrete structure of ASG circuit.Due to ASG circuit as driver element be not the present invention the emphasis that will discuss in detail, so the present invention does not limit the concrete structure of described driving circuit.Those skilled in the art can understand in conjunction with existing knowledge voluntarily, and a kind of example that Fig. 7 just provides for the embodiment of the present invention is described, should not limit the present invention with this.
Embodiment tetra-
The present embodiment has provided a kind of display panel, and as shown in Fig. 8 a, Fig. 8 b, wherein Fig. 8 b is the partial cutaway schematic of irising out a kind of concrete structure of part with ellipse in the equivalent electrical circuit of Fig. 8 a.Described display panel comprises first substrate 21 and the second substrate 22 arranging corresponding thereto, wherein first substrate 21 can comprise the gate driver circuit described in arbitrary embodiment 211 and grid 212 in above-described embodiment, and the second grid signal S2 of gate driver circuit 211 outputs is loaded on grid 212.Described display panel also comprises the touch control electrode layer 213 being positioned on first substrate 21 or second substrate 22, between touch control electrode layer 213 and grid 21, forms stray capacitance, and described stray capacitance i.e. the described load from holding.
It should be noted that, still using common electrode layer as touch control electrode layer 213 in the present embodiment, that is to say, touch controllable function is realized by receiving or send described touching signals by public electrode, and public electrode itself can be used as described touch-control electrode and uses.In addition, in the present embodiment, described common electrode layer 213 is positioned on first substrate 21, but common electrode layer also can be positioned on second substrate 22, and it can form stray capacitance with the grid 212 being positioned on first substrate 21 too, becomes the described load from holding.
Concrete, described touch control electrode layer (common electrode layer) 213, can comprise a plurality of independently public electrode pieces, as shown in fig. 1, described in each, public electrode piece can be received or be sent described touching signals by the cabling being electrically connected to it, thereby realizes the function of described touch-control electrode.Here " independence ", refer to that described common electrode layer is divided into the fritter cutting off mutually one by one, being connected or contact physically not between each fritter and adjacent fritter, each fritter receives or sends described touching signals separately by the cabling being electrically connected to it, when not applying any signal, between these fritters, can be considered as being electrically insulated mutually.
It must be noted that, common electrode layer described here (touch control electrode layer) 213 can be divided into a plurality of fritters, thereby realize reception and the transmission of described touching signals, but as touch control electrode layer itself, annexation between the shape of described touch-control electrode, layout, position, electrode can be diversified, and this is a kind of preferred implementation wherein just; And no matter how the electrode in common electrode layer 213 (touch control electrode layer) is laid, described touch-control electrode all can form stray capacitance with grid 212, cause the described load from holding, therefore, should not using the structure of the touch control electrode layer 213 specifically enumerated in the present embodiment as the restriction to the present embodiment.In addition, touch control electrode layer in Fig. 8 a (common electrode layer) 213 is divided into a plurality of independently fritters, remove outer peripheral areas, each fritter covers 4 grids, but in the present embodiment, for the several grids of the concrete corresponding covering of a fritter, do not limit, the concrete quantity that should not show with Fig. 8 a is not limited.
Further concrete, as shown in Figure 8 b, first substrate in described display panel can be tft array substrate, described display panel can comprise successively along printing opacity direction: grid layer, and described grid layer comprises the grid 212 of described TFT and the gate line being electrically connected to grid 212 (not shown in Fig. 8 b); Active layer 214, active layer 214 is also semiconductor layer, generally can be by amorphous silicon or low temperature polycrystalline silicon, or oxide semiconductor etc. makes, and active layer 214 need be electrically insulated with described grid layer (in Fig. 8 b, with a rete that plays insulating effect, schematically representing); Source-drain electrode layer 215, the source electrode that source-drain electrode layer 215 comprises described TFT and drain electrode, and the data line being electrically connected to described source electrode (not shown in Fig. 8 b); Insulation course 216; Described common electrode layer 213.Also be touch control electrode layer; Planarization layer 217; And pixel electrode layer 218, pixel electrode layer 218 comprises a plurality of pixel electrodes, and described in each, the drain electrode of TFT is electrically connected to a described pixel electrode.
Described band can be display panels from the display panel that holds touch controllable function, now, second substrate 22 is color film (color filter, CF) substrates, between first substrate 21 and second substrate 22, be also mingled with liquid crystal, forming liquid crystal layer (not shown in Fig. 8 b).
Described band will be divided into two stages from the work period of holding the display panel of touch controllable function, be respectively used to realize Presentation Function and touch controllable function, accordingly, drive a frame time cycle T of the gate driver circuit of described display panel also to comprise during demonstration t2 during t1 and touch-control, wherein, during demonstration, in t1, described display panel is realized Presentation Function, during touch-control, in t2, described display panel is realized touch controllable function.
As shown in Figure 9, during showing, in t1, described gate driver circuit is exported second grid signal S2, realizes the Presentation Function of described display panel.Now, in conjunction with consulting Fig. 3, the control signal Sc that modulating unit 12 receives should be for invalid, therefore the first grid signal S1 that driver element 11 generates will directly pass through output terminal 123 outputs of modulating unit 12, as second grid signal S2, send on the grid being electrically connected to this gate line, thereby realize Presentation Function.In Fig. 9, with low level, represent that control signal Sc is invalid, in this time, the first grid signal S1 receiving on gate line has a square wave, and all TFT that are electrically connected to described gate line in the high level time section of this square wave will open, and receives the data-signal on data line separately.
During touch-control, in t2, described gate driver circuit is exported second grid signal S2, realizes the touch controllable function of described display panel, and now, control signal Sc is effective.In conjunction with consulting Fig. 3, the control signal Sc that modulating unit 12 receives is effective (with high level, representing that control signal Sc is effective temporarily), therefore modulating unit 12 will be modulated the first grid signal S1 receiving by modulation signal Sa, first grid signal S1 and modulation signal Sa for example superpose, then export second grid signal S2, send on the grid being electrically connected to this gate line, thereby in described display panel is realized the time of touch controllable function, two electrode potentials of the stray capacitance that formed by grid and described touch-control electrode are equated, reduce the impact that described stray capacitance is brought.In during this t2, the second grid signal S2 carrying on described gate line needs consistent (about the understanding of " unanimously " with the touching signals applying on described touch-control electrode (public electrode), please refer to above), also can experience the process discharging and recharging as shown in Figure 4, but should be noted the size of the signal applying on gate line, guarantee not affect the image of described display panel, for example described second grid signal S2 (or touching signals) is low level or negative voltage, can not make like this TFT being electrically connected to corresponding gate line open, thereby affect the image of display frame.As front narrated, the parameters such as the waveform of concrete modulation signal Sa, amplitude, frequency, phase place can be set according to second grid signal S2 and first grid signal S1, at this, also repeat no more.
Further, when modulating unit 12 is thin film transistor (TFT) 124 (as shown in Figure 5), or when gating unit 125 is thin film transistor (TFT) (as shown in Figure 6 b), can determine when control signal Sc is effective according to the type of thin film transistor (TFT).When thin film transistor (TFT) 124 or thin film transistor (TFT) 125 are N-type TFT, in the time that control signal Sc is high level, control signal Sc is effective, invalid in all the other times; When thin film transistor (TFT) 124 or thin film transistor (TFT) 125 are P type TFT, control signal Sc is that in the low level time, control signal Sc is effective, and all the other times are invalid.
The present invention also provides a kind of display device, can comprise the display panel described in above-mentioned arbitrary embodiment, or comprise the gate driver circuit described in arbitrary embodiment.Display device provided by the invention can be in the situation that additionally not increasing structure, not increasing by one technique, reduces band impact on described display panel from the stray capacitance of display panel of holding touch controllable function, improved the performance of described display panel.
It should be noted that, above embodiment can use for reference mutually, Integrated using.Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement to make possible change and modification to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection domain of technical solution of the present invention.
Claims (11)
1. a gate driver circuit, holds the display panel of touch controllable function certainly for rotating band, and described driving circuit comprises:
Driver element, described driver element is used for receiving a plurality of input signals, generates and export first grid signal;
Modulating unit, comprises control end, first input end, the second input end and output terminal; Wherein, described first input end receives described first grid signal, and described the second input end receives modulation signal, described control end reception control signal, described output terminal output second grid signal;
Whether described modulating unit is selected by described modulation signal, described first grid signal to be modulated according to the control signal receiving, and exports described second grid signal, to reduce the described load from holding.
2. gate driver circuit as claimed in claim 1, is characterized in that, described modulating unit, when described control signal is effective, outputs to described modulation signal the output terminal of described modulating unit, as second grid signal.
3. gate driver circuit as claimed in claim 1, it is characterized in that, described modulating unit comprises a thin film transistor (TFT), the control end of described modulating unit is the grid of described thin film transistor (TFT), the first input end of described modulating unit couples the output terminal of described modulating unit, first utmost point that the second input end of described modulating unit is described thin film transistor (TFT), second utmost point of described thin film transistor (TFT) is coupled to the output terminal of described modulating unit.
4. gate driver circuit as claimed in claim 1, is characterized in that,
Described modulating unit comprises gating circuit and adding circuit, described gating circuit receives described control signal by the control end of described modulating unit, the second input end by described modulating unit receives described modulation signal, and when described control signal is effective, described modulation signal is exported to described adding circuit;
Described adding circuit receives described first grid signal by the first input end of described modulating unit, and modulation signal and the described first grid signal of described gating circuit output are superposeed, and export described second grid signal by the output terminal of described modulating unit.
5. gate driver circuit as claimed in claim 4, it is characterized in that, described gating circuit is thin film transistor (TFT), the grid of described thin film transistor (TFT) is the control end of described modulating unit, the second input end of the first very described modulating unit of described thin film transistor (TFT), second utmost point of described thin film transistor (TFT) is coupled to a signal input part of described adding circuit.
6. a display panel, comprise first substrate and the second substrate arranging corresponding thereto, wherein said first substrate comprises gate driver circuit and the grid as described in any one in claim 1-5, described display panel also comprises the touch control electrode layer being positioned on described first substrate or described second substrate, and described touch control electrode layer and described grid form stray capacitance.
7. display panel as claimed in claim 6, it is characterized in that, described touch control electrode layer is common electrode layer, and described common electrode layer comprises a plurality of independently public electrode pieces, and described in each, public electrode piece receives or send touching signals by the cabling being electrically connected to it.
8. display panel as claimed in claim 7, is characterized in that, described first substrate is tft array substrate, and described display panel comprises successively along printing opacity direction:
Grid layer, described grid layer comprises the grid of described TFT and the gate line being electrically connected to it;
Active layer;
Source-drain electrode layer, source electrode and drain electrode that described source-drain electrode layer comprises described TFT, and the data line being electrically connected to described source electrode;
Insulation course;
Described common electrode layer;
Planarization layer, and
Pixel electrode layer, comprises a plurality of pixel electrodes, and the drain electrode of described TFT is electrically connected to a pixel electrode.
9. display panel as claimed in claim 7, is characterized in that, drives the frame time periodic packets of gate driver circuit of described display panel containing during showing and during touch-control, wherein:
During described demonstration, described gate driver circuit is exported described second grid signal, realizes the Presentation Function of described display panel, and described control signal is invalid;
During described touch-control, described gate driver circuit is exported described second grid signal, realizes the touch controllable function of described display panel, and described control signal is effective.
10. display panel as claimed in claim 9, is characterized in that, during described touch-control in, described second grid signal is consistent with described touching signals.
11. 1 kinds of display device, comprise the display panel as described in any one claim in claim 6-10.
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