CN203311812U - Touch display drive circuit and display device - Google Patents
Touch display drive circuit and display device Download PDFInfo
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- CN203311812U CN203311812U CN2013203071090U CN201320307109U CN203311812U CN 203311812 U CN203311812 U CN 203311812U CN 2013203071090 U CN2013203071090 U CN 2013203071090U CN 201320307109 U CN201320307109 U CN 201320307109U CN 203311812 U CN203311812 U CN 203311812U
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Abstract
The utility model provides a touch display drive circuit and a display device. The touch display drive circuit comprises a drive transistor, a compensation drive unit and a touch sensing unit. The drive transistor is used for driving a pixel display device to perform pixel display. The compensation drive unit is used for driving the drive transistor to perform pixel display and adjusting the gate source voltage of the drive transistor while driving the drive transistor to perform pixel display so as to enable the compensation of the gate source voltage to offset a threshold voltage. The touch sensing unit is used for receiving a touch control signal and controlling the compensation drive unit to drive the drive transistor to perform pixel display according to the touch control signal. The drive transistor, the compensation drive unit and the touch sensing unit are connected in sequence. By adopting the technical scheme of the utility model, the technology of touch and drive display can be integrated, so that the thickness of the display screen is reduced.
Description
Technical field
The utility model relates to the display technique field, is specifically related to a kind of touch display driver circuit and display device.
Background technology
Touch-screen obtains increasing the concern on consumption electronic product market.Touch-screen has been widely used in mobile electronic device as the interface of man-machine interaction at present, as Mobile phone screen, and notebook computer, digital camera etc.Touch-screen can be divided into two classes according to technology: externally positioned type (external) touch-screen and internally-arranged type (in-cell) touch-screen.The externally positioned type touch-screen is that a touching device is set on display panel, and the externally positioned type touch-screen has been widely used in the mobile application products such as mobile phone, yet externally positioned type touch-screen cost is higher, and thickness is larger.When needs were done touch-screen increasing, above-mentioned two shortcomings of externally positioned type touch-screen just displayed all the more.Current, consumer electronics product such as mobile phone, panel computer etc. all want cube less, and thickness is thinner, and weight is lighter, and therefore the internally-arranged type touch-screen can solve above-mentioned two shortcomings well owing to being incorporated in display panel.
(Active Matrix Organic Light Emitting Diode, be called for short: application AMOLED) is more and more important for organic light emitting diode (AMOLED) panel.The pixel display device of AMOLED is Organic Light Emitting Diode (Organic Light-Emitting Diode, hereinafter to be referred as OLED), AMOLED produces drive current by driving thin film transistor (TFT) under state of saturation, this drive current driving OLED is luminous.At present, the AMOLED driving circuit adopts traditional 2T1C circuit usually, and this 2T1C circuit comprises two thin film transistor (TFT)s and 1 memory capacitance.
The inventor finds in prior art to exist at least following problem: traditional 2T1C circuit, and can only carry out OLED and drive demonstration, the function that does not have internally-arranged type to touch, can't realize that internally-arranged type touches and OLED drives show integrated, increased the thickness of display screen.
The utility model content
A kind of touch display driver circuit and display device that the utility model provides, it can be realized touching with OLED and drive show integrated, reduces the thickness of display screen.
For achieving the above object, the utility model provides a kind of touch display driver circuit, this touch display driver circuit comprises: the driving transistors that carries out the pixel demonstration be used to driving pixel display device, for driving described driving transistors to carry out the pixel demonstration and to drive described driving transistors to carry out when pixel shows regulating the gate source voltage of described driving transistors so that the compensation drive unit that the compensation rate of described gate source voltage and threshold voltage offset, for receiving the touch control signal and driving described driving transistors to carry out the touch-sensing unit of pixel demonstration according to the described compensation drive unit of the touch control signal controlling received,
Described driving transistors, described compensation drive unit and described touch-sensing unit are connected successively.
Alternatively, described compensation drive unit comprises: the first switching tube and voltage regulating module;
The grid of described the first switching tube is connected with the first control line, and first utmost point of described the first switching tube is connected with data line, and second utmost point of described the first switching tube is connected with described voltage regulating module;
The grid of described driving transistors is connected with described voltage regulating module, and first utmost point of described driving transistors is connected with described voltage regulating module, and second utmost point of described driving transistors is connected with described voltage regulating module;
Described voltage regulating module is connected with described the first control line with the first power supply, and described voltage regulating module is connected with described touch-sensing unit, and described touch-sensing unit is connected with the 3rd power supply.
Alternatively, described pixel display device is connected with first utmost point of described driving transistors, and described pixel display device is connected with second source.Alternatively, described touch-sensing unit comprises: photodiode, the 6th switching tube, the 9th switching tube and the 8th switching tube;
One end of described photodiode is connected with described the 3rd power supply, and the other end of described photodiode is connected with first utmost point of described the 9th switching tube;
The grid of described the 6th switching tube is connected with the 3rd control line, and first utmost point of described the 6th switching tube is connected with described voltage regulating module with second utmost point of described the 9th switching tube, and second utmost point of described the 6th switching tube is connected with described voltage regulating module;
The grid of described the 9th switching tube is connected with described the 4th control line, and second utmost point of described the 9th switching tube is connected with described voltage regulating module;
The grid of described the 8th switching tube is connected with the 4th control line, and first utmost point of described the 8th switching tube is connected with second utmost point of described voltage regulating module and described driving transistors, and second utmost point of described the 8th switching tube is connected with read line.
Alternatively, described voltage regulating module comprises: memory capacitance, second switch pipe, the 3rd switching tube and the 4th switching tube;
The grid of described second switch pipe is connected with described the first control line, first utmost point of described second switch pipe is connected with first utmost point of described the 6th switching tube with second utmost point of described the 9th switching tube, and second utmost point of described second switch pipe is connected with described memory capacitance with second utmost point of described the first switching tube and is connected;
The grid of described the 3rd switching tube is connected with described the first control line, first utmost point of described the 3rd switching tube is connected with described memory capacitance, first utmost point of described the 3rd switching tube is connected with first utmost point of described the 4th switching tube, and second utmost point of the 3rd switching tube is connected with described the first power supply;
The grid of described the 4th switching tube is connected with the 5th control line, and first utmost point of described the 4th switching tube is connected with described memory capacitance, and second utmost point of described the 4th switching tube is connected with first utmost point of described the 8th switching tube and second utmost point of described driving transistors.
Alternatively, described touch display driver circuit is the multi-stage cascade circuit, described the first control line, the second control line and the 3rd control line receive the signal that touches the input of display driver circuit voltage source at the corresponding levels, and described the 4th control line is for receiving the Voltage-output signal of upper level with described the 5th control line.
Alternatively, described voltage regulating module also comprises: the 7th switching tube;
The grid of described the 7th switching tube is connected with the second control line, first utmost point of described the 7th switching tube is connected with described second source with described pixel display device, and second utmost point of described the 7th switching tube is connected with described pixel display device with first utmost point of second utmost point of described the 6th switching tube, described driving transistors.
Alternatively, the voltage that provides of described the first power supply is reference voltage;
The voltage that described the 3rd power supply provides is reference voltage;
First utmost point of described driving transistors is connected with the negative pole of described pixel display device, and the positive pole of described pixel display device is connected with described second source.
Alternatively, described the first switching tube, described the 4th switching tube, described the 8th switching tube and described the 9th switching tube are P type thin film transistor (TFT);
Described second switch pipe, described the 3rd switching tube, described the 6th switching tube, described the 7th switching tube and described driving tube are the N-type thin film transistor (TFT).
Alternatively, the voltage that provides of described second source is reference voltage;
The voltage that described the 3rd power supply provides is reference voltage;
First utmost point of described driving tube crystal is connected with the positive pole of described pixel display device, and the negative pole of described pixel display device is connected with described the first power supply.
Alternatively, described the first switching tube, described the 4th switching tube, described the 8th switching tube and described the 9th switching tube are the N-type thin film transistor (TFT);
Described second switch pipe, described the 3rd switching tube, described the 6th switching tube, described the 7th switching tube and described driving tube are P type thin film transistor (TFT).
For achieving the above object, the utility model provides a kind of display device, and this display device comprises: be used to the described control module that drives described the first control line, described the second control line, described the 3rd control line, described the 4th control line and described the 5th control line, be used to the described data line driver element that drives described data line, be used to reading the described reading unit of the signal on described read line;
Described the first control line, described the second control line, described the 3rd control line, described the 4th control line, described the 5th control line are connected with described control module;
Described data line driver element is connected with described data line;
Described reading unit is connected with described read line;
Described touch display driver circuit is connected with described data line, described control line, described read line;
Described touch display driver circuit adopts above-mentioned touch display driver circuit.
Touch display driver circuit and display device that the utility model provides, this touch display driver electricity comprises: the driving transistors that carries out the pixel demonstration be used to driving pixel display device, for driving described driving transistors to carry out the pixel demonstration and to drive described driving transistors to carry out when pixel shows regulating the gate source voltage of described driving transistors so that the compensation drive unit that the compensation rate of described gate source voltage and threshold voltage offset, for receiving the touch control signal and driving described driving transistors to carry out the touch-sensing unit of pixel demonstration according to the described compensation drive unit of the touch control signal controlling received, described driving transistors, described compensation drive unit and described touch-sensing unit are connected successively.It is integrated that the technical solution of the utility model can realize that touch and OLED drive demonstration, reduces the thickness of display screen.
The accompanying drawing explanation
The structural representation of the touch display driver circuit that Fig. 1 provides for the utility model embodiment mono-;
The structural representation of the circuit of the touch display driver that Fig. 2 the utility model embodiment bis-provides;
Fig. 3 touches the schematic diagram of the input voltage of display driver circuit in embodiment bis-;
Fig. 4 touches the equivalent circuit diagram of display driver circuit initial phase in embodiment bis-;
Fig. 5 is the equivalent circuit diagram that touches display driver circuit touch and fetch phase in embodiment bis-;
Fig. 6 touches the equivalent circuit diagram of display driver circuit buffer stage in embodiment bis-;
Fig. 7 touches the equivalent circuit diagram of display driver circuit charging stage in embodiment bis-;
Fig. 8 touches the equivalent circuit diagram of display driver circuit discharge regime in embodiment bis-;
The structural representation of the touch display driver circuit that Fig. 9 provides for the utility model embodiment tri-.
Embodiment
For making those skilled in the art understand better the technical solution of the utility model, below in conjunction with accompanying drawing, a kind of touch display driver circuit and the display device that the utility model provides is described in further detail.
A kind of structural representation that touches display driver circuit that Fig. 1 provides for the utility model embodiment mono-, as shown in Figure 1, this touch display driver circuit comprises: driving transistors, touch-sensing unit, compensation drive unit; Wherein, driving transistors carries out the pixel demonstration for driving pixel display device; The touch-sensing unit, for receiving the touch control signal, drives driving transistors to carry out the pixel demonstration according to the touch control signal controlling compensation drive unit received; Compensation drive unit is for driving driving transistors to carry out the pixel demonstration; And, when the driving driving transistors shows to carry out pixel, regulate the gate source voltage of driving transistors, the compensation rate of gate source voltage and threshold voltage are offseted.
Particularly, the grid of the first switch transistor T 1 is connected with the first control line CR1, and first utmost point of the first switch transistor T 1 is connected with data line, and second utmost point of the first switch transistor T 1 is connected with voltage regulating module; The grid of the 8th switching tube T8 is connected with the 4th control line CR1_N-1, and first utmost point of the 8th switching tube T8 is connected with second utmost point of voltage regulating module and driving transistors T5, and second utmost point of the 8th switching tube T8 is connected with read line; The grid of driving transistors T5 is connected with voltage regulating module, and first utmost point of driving transistors T5 is connected with voltage regulating module, and second utmost point of driving transistors T5 is connected with voltage regulating module; Voltage regulating module is connected with the first control line CR1 with the first power supply, and voltage regulating module is connected with the touch-sensing unit, and the touch-sensing unit is connected with the 3rd power supply.Pixel display device D1 is connected with first utmost point of driving transistors T5, and pixel display device D1 is connected with second source.
In the present embodiment, pixel display device can be OLED.The first switch transistor T 1 and the 8th switching tube T8 are P type thin film transistor (TFT), and driving transistors T5 is the N-type thin film transistor (TFT), and the voltage that the first power supply provides is reference voltage VSS, and the voltage that second source provides is VDD, and the voltage that the 3rd power supply provides is reference voltage VSS.Alternatively, the first switch transistor T 1 in the present embodiment and the 8th switching tube T8 also can be the N-type thin film transistor (TFT), driving transistors T5 is P type thin film transistor (TFT), the voltage that second source provides is reference voltage VSS, the voltage that the first power supply provides is VDD, and the voltage that the 3rd power supply provides is reference voltage VSS.
In the utility model, if when the voltage that the first power supply provides is reference voltage, correspondingly, the voltage that second source provides is higher than reference voltage; When if the voltage that second source provides is reference voltage, correspondingly, the voltage that the first power supply provides is higher than reference voltage.Wherein, VDD can be high level, correspondingly, can be low level as the VSS of reference voltage.
In the present embodiment, in touching display driver circuit, be provided with touch-sensing unit and compensation drive unit, the touch-sensing unit can utilize the variation of illumination generation current signal to cause the variation of voltage signal, by driving transistors T5 and the 8th switching tube T8, the voltage signal of variation is delivered to external control circuit, thereby make external control circuit can judge the generation of touch, after the generation of judging touch, compensation drive unit can be regulated the gate source voltage V of driving transistors T5
Gs, make drive current and its threshold voltage V of driving transistors T5 under state of saturation touched in display driver circuit
ThIrrelevant.Particularly, voltage regulating module can be regulated V
ThSize, make V
GsThe composition component in comprise V
ThThereby, make V
ThAt drive current I=K (V
Gs-V
Th)
2In be cancelled, finally make drive current and threshold voltage V
ThIrrelevant.Wherein, driving transistors T5 refers to the transistor that drive current is provided for pixel display device D1, and threshold voltage refers to the threshold voltage of this driving transistors T5, and gate source voltage refers to gate source voltage and the source voltage V of driving transistors T5
sBetween difference.
The touch display driver circuit that the present embodiment provides comprises: driving transistors, touch-sensing unit, compensation drive unit; Wherein, described driving transistors carries out the pixel demonstration for driving pixel display device; Described touch-sensing unit, be used to receiving the touch control signal, drive described driving transistors to carry out the pixel demonstration according to the described compensation drive unit of the touch control signal controlling received; Described compensation drive unit is used for: drive described driving transistors to carry out the pixel demonstration; And, when the described driving transistors of driving shows to carry out pixel, regulate the gate source voltage of described driving transistors, compensation rate and the threshold voltage of described gate source voltage are offseted, it can realize touching and the pixel display device driving shows integrated, reduce the thickness of display screen, improve brightness and the homogeneity of display screen, reduce costs.
A kind of structural representation that touches display driver circuit that Fig. 2 provides for the utility model embodiment bis-, as shown in Figure 2, the present embodiment is on the basis of above-described embodiment one, and the touch-sensing unit comprises: photodiode, the 6th switch transistor T 6, the 9th switch transistor T 9 and the 8th switching tube T8.
Photodiode also can change makes to touch electric capacity.In the present embodiment, photodiode is photodiode (English: photoelectric diode, abbreviation PD).Photodiode changes in the situation map 2 of making touch electric capacity not shown.Wherein, an end of photodiode is connected with the 3rd power supply VSS, and the other end of photodiode is connected with first utmost point of the 9th switch transistor T 1; The grid of the 6th switch transistor T 6 is connected with the 3rd control line CR3, and first utmost point of the 6th switch transistor T 6 is connected with voltage regulating module with second utmost point of the 9th switch transistor T 9, and second utmost point of the 6th switch transistor T 6 is connected with voltage regulating module; The grid of the 9th switch transistor T 9 is connected with the 4th control line CR1_N-1, and second utmost point of the 9th switch transistor T 9 is connected with voltage regulating module.
In the present embodiment, voltage regulating module comprises: memory capacitance Cs, second switch pipe T2, the 3rd switch transistor T 3 and the 4th switch transistor T 4; The grid of second switch pipe T2 is connected with the first control line CR1, first utmost point of second switch pipe T2 is connected with first utmost point of the 6th switch transistor T 6 with second utmost point of the 9th switch transistor T 9, second utmost point of second switch pipe T2 with memory capacitance Cs, be connected with second utmost point of the first switch transistor T 1 be connected; The grid of the 3rd switch transistor T 3 is connected with the first control line CR1, and first utmost point of the 3rd switch transistor T 3 is connected with memory capacitance Cs, and first utmost point of the 3rd switch transistor T 3 is connected with first utmost point of the 4th switch transistor T 4, and second utmost point of the 3rd switch transistor T 3 is connected with the first power supply.
Alternatively, in the present embodiment, voltage regulating module can also comprise: the 7th switching tube.The grid of the 7th switching tube T7 is connected with the second control line CR2, first utmost point of the 7th switching tube T7 is connected with second source with pixel display device, and second utmost point of the 7th switching tube T7 is connected with pixel display device D1 with second utmost point of the 6th switch transistor T 6, first utmost point of driving transistors T5.First utmost point of the 7th switching tube T7 and second utmost point are connected to the two ends of pixel display device D1, when the 7th switching tube T7 is used in driving transistors T5 and produces incorrect drive current by pixel display device D1 short circuit, in order to avoid pixel display device D1 is luminous under incorrect drive current effect, thereby produce incorrect luminous intensity to cause the demonstration mistake; And when driving transistors T5 produces correct drive current, pixel display device D1 is communicated with driving transistors T5, and make pixel display device D1 luminous under correct drive current effect, guarantee normally to show.
The voltage that the first power supply in the present embodiment provides is reference voltage VSS; The voltage that the 3rd power supply provides is reference voltage VSS; First utmost point of driving transistors T5 is connected with the negative pole of pixel display device D1, and the positive pole of pixel display device D1 is connected with second source VDD.
Wherein, the first switch transistor T 1, the 4th switch transistor T 4, the 8th switching tube T8 and the 9th switch transistor T 9 are P type thin film transistor (TFT); Second switch pipe T2, the 3rd switch transistor T 3, the 6th switch transistor T 6, the 7th switching tube T7 and driving transistors T5 are the N-type thin film transistor (TFT).
Below in conjunction with Fig. 3, to shown in Figure 8, the course of work that touches display driver circuit in the present embodiment is described in detail.Fig. 3 touches the schematic diagram of the input voltage of display driver circuit in embodiment bis-, wherein: a is initial phase, and b is for touching fetch phase, and c is buffer stage, and d is the charging stage, and e is glow phase.Fig. 4 touches the schematic equivalent circuit of display driver circuit initial phase in embodiment bis-, as shown in Figure 3 and Figure 4, at initial phase, the voltage that the first control line CR1 provides is high level, the voltage that the second control line CR2 provides is high level, the voltage that the 3rd control line CR3 provides is high level, the 4th control line CR1_N-1 is high level, the 5th control line CR2_N-1 is high level, now, second switch pipe T2, the 3rd switch transistor T 3, the 6th switch transistor T 6 and the 7th switching tube T7 open, the first switch transistor T 1, the 4th switch transistor T 4, the 8th switching tube T8 and the 9th switch transistor T 9 are closed.Therefore in Fig. 2, touch the schematic equivalent circuit of display driver circuit initial phase as shown in Figure 4, now, VDD writes the A point, VA=VB=VDD, and VC=VSS, memory capacitance Cs both end voltage is VCs=VA-VC=VDD-VSS.Wherein, the reference voltage that VSS provides for the first power supply, the reference voltage VSS that the voltage VDD that the voltage that VDD provides for second source, second source provide provides higher than the first power supply.
Fig. 5 is the schematic equivalent circuit that touches display driver circuit touch and fetch phase in embodiment bis-, as shown in Figure 3 and Figure 5, the touch-sensing unit is being touched and external drive circuit while reading, the voltage that the first control line CR1 provides is high level, the voltage that the second control line CR2 provides is high level, the voltage that the 3rd control line CR3 provides is low level, the 4th control line CR1_N-1 is low level, the 5th control line CR2_N-1 is high level, now, second switch pipe T2, the 3rd switch transistor T 3, the 7th switching tube T7, the 8th switching tube T8 and the 9th switch transistor T 9 are opened, the first switch transistor T 1, the 4th switch transistor T 4 and the 6th switch transistor T 6 are closed.Therefore in Fig. 2, touch the schematic equivalent circuit of display driver circuit initial phase as shown in Figure 5, now the A point is connected with photodiode by the 9th switch transistor T 9.Photodiode in no touch with that the leakage current while touching is arranged is different.Particularly, when no touch occurs, photodiode can produce leakage current while being subject to the irradiation of light, now leakage current is larger, when the generation of touch is arranged, the light shone on photodiode is blocked, the leakage current now produced in photodiode is less, when no touch occurs and have the variation that while touch occurring, leakage current occurs to make A point voltage signal change, after amplifying, the driven transistor T 5 of the variation that A point voltage signal occurs transfers to read line, read line is connected with external control circuit, external control circuit is resolved the voltage signal changed, the leakage current that photodiode produces under the irradiation of light is larger than the leakage current that the photodiode without irradiation the time produces, thereby can judge to touch, occur.
Fig. 6 touches the schematic equivalent circuit of display driver circuit buffer stage in embodiment bis-, as shown in Figure 3 and Figure 6, the voltage that the first control line CR1 provides is high level, the voltage that the second control line CR2 provides is high level, the voltage that the 3rd control line CR3 provides is low level, the 4th control line CR1_N-1 is high level, the 5th control line CR2_N-1 is low level, second switch pipe T2 now, the 3rd switch transistor T 3, the 4th switch transistor T 4 and the 7th switching tube T7 open, the first switch transistor T 1, the 6th switch transistor T 6, the 8th switching tube T8 and the 9th switch transistor T 9 are closed.Therefore in Fig. 2, touch the schematic equivalent circuit of display driver circuit initial phase as shown in Figure 6, now the A point is discharged to by memory capacitance Cs the voltage VSS that the first power supply provides, and A level point step-down, be down to VSS+V
Th, wherein, V
ThFor the threshold voltage of driving transistors T5, thereby eliminate the impact touched on last stage.
Fig. 7 touches the schematic equivalent circuit of display driver circuit charging stage in embodiment bis-, as shown in Figure 3 and Figure 7, the voltage that the first control line CR1 provides is low level, the voltage that the second control line CR2 provides is high level, the voltage that the 3rd control line CR3 provides is high level, the 4th control line CR1_N-1 is high level, and the 5th control line CR2_N-1 is low level.Therefore in Fig. 2, touch the schematic equivalent circuit of display driver circuit initial phase as shown in Figure 7, now the first switch transistor T 1, the 4th switch transistor T 4, the 6th switch transistor T 6 and the 7th switching tube T7 open, and second switch pipe T2, the 3rd switch transistor T 3, the 8th switching tube T8 and the 9th switch transistor T 9 are closed.The data voltage V that data line provides
DataThe voltage input, memory capacitance Cs is recharged, and now the A point voltage is VDD, and the B point voltage is V
Data, the C point voltage is VDD-V
Th, the voltage at memory capacitance Cs two ends is VCs=VB-VC=V
Data-VDD+V
Th.Wherein, V
ThThreshold voltage for driving transistors T5.
Fig. 8 touches the schematic equivalent circuit of display driver circuit discharge regime in embodiment bis-, as Fig. 3 and shown in Figure 8, the voltage that the first control line CR1 provides is high level, the voltage that the second control line CR2 provides is low level, the voltage that the 3rd control line CR3 provides is low level, the 4th control line CR1_N-1 is high level, the 5th control line CR2_N-1 is low level, second switch pipe T2 now, the 3rd switch transistor T 3 and the 4th switch transistor T 4 are opened, the first switch transistor T 1, the 6th switch transistor T 6, the 7th switching tube T7, the 8th switching tube T8 and the 9th switch transistor T 9 are closed.Therefore in Fig. 2, touch the schematic equivalent circuit of display driver circuit initial phase as shown in Figure 8, now utilize the driving transistors T5 of the voltage driving pixel display device D1 at memory capacitance Cs two ends, pixel display device D1 starts luminous.The grid A point of driving transistors T5 is directly connected to the B end of memory capacitance Cs, and VA=VB, C point voltage are VSS, the gate source voltage V of driving transistors T5
Gs=VAC=VBC=VCs=V
Data-VDD+V
Th, the voltage VDD that the data voltage that data line provides provides higher than second source.The electric current that now flows through pixel display device D1 is: I=K (V
Gs-V
Th)
2=K (V
Data-VDD+V
Th-V
Th)
2=K (V
Data-VDD)
2.Wherein, K=μ
eff* C
OX* (W/L)/2, wherein, μ
effFor the effective mobility of the charge carrier of driving transistors T5, C
OXFor the channel width of driving transistors T5, L is the channel length of driving transistors T5.
In the present embodiment, touch the touch-sensing unit of display driver circuit under the control of driving transistors and the 8th switching tube, the voltage signal of variation is transferred to external control circuit, thereby judge the generation of touch, after the generation of judging touch, memory capacitance Cs is recharged, the voltage V that data line is provided
DataThreshold voltage V with driving tube
ThWrite memory capacitance, that is, in the charging stage, make the voltage VCs=V at memory capacitance two ends
Data-VDD+V
Th, then to driving transistors, provide gate source voltage by memory capacitance, with the threshold voltage of compensation for drive transistor.Driving transistors drives pixel display device under the control of voltage regulating module, flow through the drive current of driving transistors and the threshold voltage V of driving transistors
ThIrrelevant, the drive current of having avoided flowing through pixel display device is subject to threshold voltage V
ThThe impact of inhomogeneous and drift, simultaneously, the drive current that flows through driving transistors also with self cut-in voltage V of pixel display device
Th-oledIrrelevant, avoided drive current to be subject to self cut-in voltage V that pixel display device is degenerated and caused
Th-oledThe impact raise, thus the homogeneity of the drive current that flows through pixel display device improved.
The touch display driver circuit structural representation that Fig. 9 provides for the utility model embodiment tri-, as shown in Figure 9, the present embodiment is on the basis of above-described embodiment one, and the touch-sensing unit comprises: photodiode, the 6th switch transistor T 6, the 9th switch transistor T 9 and the 8th switching tube T8.
In the present embodiment, and photodiode (English: photoelectric diode, be called for short PD) can be changed to touch electric capacity.Photodiode is changed in the situation map 2 that touches electric capacity not shown.Wherein, an end of photodiode is connected with the voltage VDD that the 3rd power supply provides, and the other end of photodiode is connected with first utmost point of the 9th switch transistor T 1; The grid of the 6th switch transistor T 6 is connected with the 3rd control line CR3, and first utmost point of the 6th switch transistor T 6 is connected with voltage regulating module with second utmost point of the 9th switch transistor T 9, and second utmost point of the 6th switch transistor T 6 is connected with voltage regulating module; The grid of the 9th switch transistor T 9 is connected with the 4th control line CR1_N-1, and second utmost point of the 9th switch transistor T 9 is connected with voltage regulating module.
In the present embodiment, voltage regulating module comprises: memory capacitance Cs, second switch pipe T2, the 3rd switch transistor T 3 and the 4th switch transistor T 4; The grid of second switch pipe T2 is connected with the first control line CR1, first utmost point of second switch pipe T2 is connected with first utmost point of the 6th switch transistor T 6 with second utmost point of the 9th switch transistor T 9, second utmost point of second switch pipe T2 with memory capacitance Cs, be connected with second utmost point of the first switch transistor T 1 be connected; The grid of the 3rd switch transistor T 3 is connected with the first control line CR1, and first utmost point of the 3rd switch transistor T 3 is connected with memory capacitance Cs, and first utmost point of the 3rd switch transistor T 3 is connected with first utmost point of the 4th switch transistor T 4, and second utmost point of the 3rd switch transistor T 3 is connected with the first power supply.
Alternatively, in the present embodiment, voltage regulating module can also comprise: the 7th switching tube.The grid of the 7th switching tube T7 is connected with the second control line CR2, first utmost point of the 7th switching tube T7 is connected with second source with pixel display device, and second utmost point of the 7th switching tube T7 is connected with pixel display device D1 with second utmost point of the 6th switch transistor T 6, first utmost point of driving transistors T5.First utmost point of the 7th switching tube T7 and second utmost point are connected to the two ends of pixel display device D1, when the 7th switching tube T7 is used in driving transistors T5 and produces incorrect drive current by pixel display device D1 short circuit, in order to avoid pixel display device D1 is luminous under incorrect drive current effect, thereby produce incorrect luminous intensity to cause the demonstration mistake; And when driving transistors T5 produces correct drive current, pixel display device D1 is communicated with driving transistors T5, and make pixel display device D1 luminous under correct drive current effect, guarantee normally to show.
The voltage that the first power supply in the present embodiment provides is reference voltage VSS; The voltage that the 3rd power supply provides is VDD; First utmost point of driving transistors T5 is connected with the positive pole of pixel display device D1, and the negative pole of pixel display device D1 is connected with the reference voltage VSS that the first power supply provides.
Wherein, the first switch transistor T 1, the 4th switch transistor T 4, the 8th switching tube T8 and the 9th switch transistor T 9 are the N-type thin film transistor (TFT); Second switch pipe T2, the 3rd switch transistor T 3, the 6th switch transistor T 6, the 7th switching tube T7 and driving transistors T5 are P type thin film transistor (TFT).
The principle of work of the touch display driver circuit in the present embodiment refers to above-described embodiment two, is not described in detail herein.
Embodiment bis-is with the difference of the touch display driver circuit of embodiment tri-: in embodiment tri-, an end of photodiode is connected with the voltage VDD that the 3rd power supply provides, and the other end of photodiode is connected with first utmost point of the 9th switch transistor T 1; The first switch transistor T 1, the 4th switch transistor T 4, the 8th switching tube T8 and the 9th switch transistor T 9 are the N-type thin film transistor (TFT); Second switch pipe T2, the 3rd switch transistor T 3, the 6th switch transistor T 6, the 7th switching tube T7 and driving transistors T5 are P type thin film transistor (TFT).And first the voltage that provides of power supply be reference voltage VSS, the voltage that second source provides is VDD, the voltage that the 3rd power supply provides is VDD; First utmost point of driving transistors T5 is connected with the positive pole of pixel display device D1, and the negative pole of pixel display device D1 is connected with the reference voltage VSS that the first power supply provides.The voltage that second source provides can be higher than reference voltage.Wherein, VDD can be high level, correspondingly, can be low level as the VSS of reference voltage.
In the touch display driver circuit that the present embodiment provides, the touch-sensing unit is under the control of driving transistors and the 8th switching tube, the voltage signal of variation is transferred to external control circuit, thereby judge the generation of touch, after the generation of judging touch, memory capacitance Cs is recharged, the voltage V that data line is provided
DataThreshold voltage V with driving tube
ThWrite memory capacitance, that is, in the charging stage, make the voltage VCs=V at memory capacitance two ends
Data-VDD+V
Th, then to driving transistors, provide gate source voltage by memory capacitance, with the threshold voltage of compensation for drive transistor.Driving transistors drives pixel display device under the control of voltage regulating module, flow through the drive current of driving transistors and the threshold voltage V of driving transistors
ThIrrelevant, the drive current of having avoided flowing through pixel display device is subject to threshold voltage V
ThThe impact of inhomogeneous and drift, simultaneously, the drive current that flows through driving transistors also with self cut-in voltage V of pixel display device
Th-oledIrrelevant, avoided drive current to be subject to self cut-in voltage V that pixel display device is degenerated and caused
Th-oledThe impact raise, thus the homogeneity of the drive current that flows through pixel display device improved.
The touch display driver circuit that above-described embodiment two and embodiment tri-provide, in actual applications, be not only applicable to polycrystalline SiTFT, applicable to other transistors yet.
It should be noted that, in the utility model, in the first switch transistor T 1, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4, driving transistors T5, the 6th switch transistor T 6, the 7th switching tube, the 8th switching tube and the 9th each transistor of switching tube, first utmost point and second utmost point are as source-drain electrode.In described transistor, the structure of first utmost point and second utmost point is identical.First utmost point and second extremely in, send a utmost point of charge carrier as source electrode, receive a utmost point of charge carrier as drain electrode.During practical application, for a transistor, position and effect according to this transistor in circuit, first utmost point can be used as source electrode, and correspondingly, second utmost point is as drain electrode; Perhaps, first utmost point can be used as drain electrode, and correspondingly, second utmost point is as source electrode.
The utility model embodiment tetra-provides a kind of display device, this display device comprises: control module, the first control line, the second control line, the 3rd control line, the 4th control line, the 5th control line, the data line driver element, data line, reading unit, read line and touch display driver circuit, control module is for driving the first control line, the second control line, the 3rd control line, the 4th control line and the 5th control line, the data line driver element is for driving data lines, reading unit is for reading the signal on read line, touch display driver circuit and the first control line, the second control line, the 3rd control line, the 4th control line, the 5th control line, data line and read line connect.
The display device that the present embodiment four provides, by adopting the touch display driver circuit in above-described embodiment two or embodiment tri-, its embodiment refers to above-described embodiment two or embodiment tri-, no longer specifically describes herein.
The display device that the present embodiment four provides comprises: be used to the control module that drives the first control line, the second control line, the 3rd control line, the 4th control line and the 5th control line, for the data line driver element of driving data lines, be used to reading the reading unit of the signal on read line; The first control line, the second control line, the 3rd control line, the 4th control line, the 5th control line are connected with control module; The data line driver element is connected with data line; Reading unit is connected with read line; Touching display driver circuit is connected with data line, control line, read line; Touch display driver circuit and adopt above-mentioned touch display driver circuit.It is integrated that it can realize that touch and OLED drive demonstration, reduces the thickness of display screen.
The embodiment of the present invention five provides a kind of touch display drive method, this touches display drive method based on touching display driver circuit, this touch display driver circuit comprises: pixel display device, the first switching tube, voltage regulating module, driving transistors, touch-sensing unit, and the method comprises:
Step 101, the first switching tube are closed under the control of the first control line, so that data line provides voltage by the first switching tube to memory capacitance;
Step 102, the 8th switching tube are closed under the control of the 4th control line, the transistorized electric current so that the read line reading flow is overdrived, and judgement has the generation of no touch;
Step 103, voltage regulating module are under the control of the first control line, the second control line, the 3rd control line, the 4th control line and the 5th control line, so that driving tube driving pixel display device is luminous.
The touch display drive method of the present embodiment five can be based on the realization of the touch display driver circuit in above-described embodiment two or embodiment tri-, and its embodiment refers to above-described embodiment two or embodiment tri-, no longer specifically describes herein.
The touch display drive method that the present embodiment provides, this touches display drive method based on touching display driver circuit, driving transistors, touch-sensing unit, compensation drive unit; Wherein, described driving transistors carries out the pixel demonstration for driving pixel display device; Described touch-sensing unit, be used to receiving the touch control signal, drive described driving transistors to carry out the pixel demonstration according to the described compensation drive unit of the touch control signal controlling received; Described compensation drive unit is used for: drive described driving transistors to carry out the pixel demonstration; And, when the described driving transistors of driving shows to carry out pixel, regulate the gate source voltage of described driving transistors, the compensation rate of described gate source voltage and threshold voltage are offseted, it can be realized touching with pixel display device and drive show integrated, reduces the thickness of display screen.
In the utility model, described touch display driver circuit can be the multi-stage cascade circuit, in every one-level, described the first control line, the second control line and the 3rd control line receive the signal that touches the input of display driver circuit voltage source at the corresponding levels, and described the 4th control line and described the 5th control line receive the Voltage-output signal of upper level; Certainly, the input signal access way of present embodiment is not limited to this, as, also can be described the 4th control line and described the 5th control line mono signal input end external power supply voltage signal, rather than receive the Voltage-output signal of upper level.
Be understandable that, above embodiment is only the illustrative embodiments adopted for principle of the present utility model is described, yet the utility model is not limited to this.For those skilled in the art, in the situation that do not break away from spirit of the present utility model and essence, can make various modification and improvement, these modification and improvement also are considered as protection domain of the present utility model.
Claims (12)
1. one kind touches display driver circuit, it is characterized in that, comprise: the driving transistors that carries out the pixel demonstration be used to driving pixel display device, for driving described driving transistors to carry out the pixel demonstration and to drive described driving transistors to carry out when pixel shows regulating the gate source voltage of described driving transistors so that the compensation drive unit that the compensation rate of described gate source voltage and threshold voltage offset, for receiving the touch control signal and driving described driving transistors to carry out the touch-sensing unit of pixel demonstration according to the described compensation drive unit of the touch control signal controlling received,
Described driving transistors, described compensation drive unit and described touch-sensing unit are connected successively.
2. touch display driver circuit according to claim 1, is characterized in that
Described compensation drive unit comprises: the first switching tube and voltage regulating module;
The grid of described the first switching tube is connected with the first control line, and first utmost point of described the first switching tube is connected with data line, and second utmost point of described the first switching tube is connected with described voltage regulating module;
The grid of described driving transistors is connected with described voltage regulating module, and first utmost point of described driving transistors is connected with described voltage regulating module, and second utmost point of described driving transistors is connected with described voltage regulating module;
Described voltage regulating module is connected with described the first control line with the first power supply, and described voltage regulating module is connected with touch-sensing unit, described touch-sensing unit, and touch-sensing unit, described touch-sensing unit is connected with the 3rd power supply.
3. touch display driver circuit according to claim 2, is characterized in that, described pixel display device is connected with first utmost point of described driving transistors, and described pixel display device is connected with second source.
4. touch display driver circuit according to claim 1, is characterized in that, described touch-sensing unit comprises: photodiode, the 6th switching tube, the 9th switching tube and the 8th switching tube;
One end of described photodiode is connected with described the 3rd power supply, and the other end of described photodiode is connected with first utmost point of described the 9th switching tube;
The grid of described the 6th switching tube is connected with the 3rd control line, and first utmost point of described the 6th switching tube is connected with described voltage regulating module with second utmost point of described the 9th switching tube, and second utmost point of described the 6th switching tube is connected with described voltage regulating module;
The grid of described the 9th switching tube is connected with described the 4th control line, and second utmost point of described the 9th switching tube is connected with described voltage regulating module;
The grid of described the 8th switching tube is connected with the 4th control line, and first utmost point of described the 8th switching tube is connected with second utmost point of described voltage regulating module and described driving transistors, and second utmost point of described the 8th switching tube is connected with read line.
5. touch display driver circuit according to claim 2, is characterized in that, described voltage regulating module comprises: memory capacitance, second switch pipe, the 3rd switching tube and the 4th switching tube;
The grid of described second switch pipe is connected with described the first control line, first utmost point of described second switch pipe is connected with first utmost point of described the 6th switching tube with second utmost point of described the 9th switching tube, and second utmost point of described second switch pipe is connected with described memory capacitance with second utmost point of described the first switching tube and is connected;
The grid of described the 3rd switching tube is connected with described the first control line, first utmost point of described the 3rd switching tube is connected with described memory capacitance, first utmost point of described the 3rd switching tube is connected with first utmost point of described the 4th switching tube, and second utmost point of the 3rd switching tube is connected with described the first power supply;
The grid of described the 4th switching tube is connected with the 5th control line, and first utmost point of described the 4th switching tube is connected with described memory capacitance, and second utmost point of described the 4th switching tube is connected with first utmost point of described the 8th switching tube and second utmost point of described driving transistors.
6. touch display driver circuit according to claim 5, it is characterized in that, described touch display driver circuit is the multi-stage cascade circuit, described the first control line, the second control line and the 3rd control line receive the signal that touches the input of display driver circuit voltage source at the corresponding levels, and described the 4th control line and described the 5th control line receive the Voltage-output signal of upper level.
7. touch display driver circuit according to claim 5, is characterized in that, described voltage regulating module also comprises: the 7th switching tube;
The grid of described the 7th switching tube is connected with the second control line, first utmost point of described the 7th switching tube is connected with described second source with described pixel display device, and second utmost point of described the 7th switching tube is connected with described pixel display device with first utmost point of second utmost point of described the 6th switching tube, described driving transistors.
8. touch display driver circuit according to claim 5, is characterized in that, the voltage that described the first power supply provides is reference voltage;
The voltage that described the 3rd power supply provides is reference voltage;
First utmost point of described driving transistors is connected with the negative pole of described pixel display device, and the positive pole of described pixel display device is connected with described second source.
9. touch display driver circuit according to claim 8, is characterized in that, described the first switching tube, described the 4th switching tube, described the 8th switching tube and described the 9th switching tube are P type thin film transistor (TFT);
Described second switch pipe, described the 3rd switching tube, described the 6th switching tube, described the 7th switching tube and described driving tube are the N-type thin film transistor (TFT).
10. touch display driver circuit according to claim 5, is characterized in that, the voltage that described second source provides is reference voltage;
The voltage that described the 3rd power supply provides is reference voltage;
First utmost point of described driving tube crystal is connected with the positive pole of described pixel display device, and the negative pole of described pixel display pixel display device is connected with described the first power supply.
11. touch display driver circuit according to claim 10, is characterized in that, described the first switching tube, described the 4th switching tube, described the 8th switching tube and described the 9th switching tube are the N-type thin film transistor (TFT);
Described second switch pipe, described the 3rd switching tube, described the 6th switching tube, described the 7th switching tube and described driving tube are P type thin film transistor (TFT).
12. display device, it is characterized in that, comprising: be used to the described control module that drives described the first control line, described the second control line, described the 3rd control line, described the 4th control line and described the 5th control line, be used to the described data line driver element that drives described data line, be used to reading the described reading unit of the signal on described read line;
Described the first control line, described the second control line, described the 3rd control line, described the 4th control line, described the 5th control line are connected with described control module;
Described data line driver element is connected with described data line;
Described reading unit is connected with described read line;
Described touch display driver circuit is connected with described data line, described control line, described read line;
Described touch display driver circuit adopts arbitrary described touch display driver circuit in the claims 1-11.
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| CN2013203071090U CN203311812U (en) | 2013-05-30 | 2013-05-30 | Touch display drive circuit and display device |
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| CN2013203071090U CN203311812U (en) | 2013-05-30 | 2013-05-30 | Touch display drive circuit and display device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104464625A (en) * | 2014-12-10 | 2015-03-25 | 合肥鑫晟光电科技有限公司 | Pixel circuit, driving method of pixel circuit, array substrate and display device |
| CN104751793A (en) * | 2013-12-26 | 2015-07-01 | 乐金显示有限公司 | Organic light emitting diode display and method for sensing driving characteristics thereof |
| CN105390093A (en) * | 2014-09-01 | 2016-03-09 | 乐金显示有限公司 | Organic light emitting display device with touch sensing function |
| WO2019105118A1 (en) * | 2017-11-29 | 2019-06-06 | 京东方科技集团股份有限公司 | Pixel circuit and drive method thereof, and display panel and display apparatus |
| WO2021203475A1 (en) * | 2020-04-09 | 2021-10-14 | 深圳市华星光电半导体显示技术有限公司 | Pixel compensation driving circuit and driving method therefor, and display device |
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2013
- 2013-05-30 CN CN2013203071090U patent/CN203311812U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104751793A (en) * | 2013-12-26 | 2015-07-01 | 乐金显示有限公司 | Organic light emitting diode display and method for sensing driving characteristics thereof |
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| CN105390093A (en) * | 2014-09-01 | 2016-03-09 | 乐金显示有限公司 | Organic light emitting display device with touch sensing function |
| CN105390093B (en) * | 2014-09-01 | 2018-01-30 | 乐金显示有限公司 | Organic light-emitting display device with touch-sensing function |
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| WO2019105118A1 (en) * | 2017-11-29 | 2019-06-06 | 京东方科技集团股份有限公司 | Pixel circuit and drive method thereof, and display panel and display apparatus |
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