CN203300193U - Active matrix organic light-emitting diode (AMOLED) pixel unit circuit and display panel - Google Patents

Abstract

The embodiment of the utility model provides an active matrix organic light-emitting diode (AMOLED) pixel unit circuit and a display panel, and the embodiment is used for integrating a touch screen circuit into an AMOLED pixel unit circuit and making an AMOLED display panel provided with a touch screen function. The AMOLED pixel unit circuit comprises a driving module which is used for amplifying an induction signal produced by a touch induction module, outputting the induction signal via an induction signal output module and driving a light-emitting module, a light-emitting control module which is used for controlling the light-emitting module to emit light, a threshold compensation module which is used for compensating a threshold voltage for the driving module, the touch induction module which is used for producing the induction signal and outputting the induction signal to the driving module, and the induction signal output module which is used for outputting the induction signal amplified by the driving module.

Description

A kind of active matrix organic light-emitting diode AMOLED pixel unit circuit and display panel

Technical field

The utility model relates to the display technique field, relates in particular to a kind of active matrix organic light-emitting diode pixel unit circuit, and display panel.

Background technology

It is with inductor Sensor and the driving circuit thereof of TSP (Touch Screen Panel, touch-screen) that touch-screen is integrated in TSP in Cell technology in liquid crystal cell, utilizes array Array technique to be produced on the Array substrate.TSP Sensor is integrated in liquid crystal display panel liquid crystal cell LCD (Liquid Crystal Display, LCDs) panel inner, can makes product lightening, functional diversities, and effectively improve the touch-screen reliability.

Fig. 1 (a), Fig. 1 (b) are basic photoinduction formula TSP in Cell circuit of the prior art, and in Fig. 1 (a), Sensor adopts photodiode D1 induction light photograph, and the generation electric leakage detects touch signal.Fig. 1 (b), Sensor adopt inductance capacitance C2 induction light photograph, rely on inductance capacitance coupling and capacitance variations to detect touch signal.TFT (Thin-Film Transistor, thin film transistor (TFT)) T1 is as amplifier transistor, for the change in voltage of amplifying after D1 detects touch signal, strengthen TSP in Cell circuit output driving force, supply the sensing circuit of outside TSP correctly to read testing result.

AMOLED(Active Matrix/Organic Light Emitting Diode, active matrix organic light-emitting diode) compare traditional liquid crystal panel, have the characteristics such as reaction velocity is very fast, contrast is higher, visual angle is wider.The pixel of AMOLED relies on associated driver circuitry on the Array substrate to drive luminescence display, and Fig. 2 is a kind of embodiment of the pixel unit circuit of AMOLED.

If simply TSP in Cell circuit shown in Fig. 1 (a) or Fig. 1 (b) is integrated in AMOLED pixel unit circuit shown in Figure 2, remove existing 5 TFT and 2 electric capacity, also need add again 3 TFT and 1 electric capacity, simultaneously control signal wire is except 3 control signals and 2 power supplys, also need add again 3 control signals, will be without enough spaces to increase these TFT and signal wire in the AMOLED pixel.Therefore, prior art can not be integrated in TSP in Cell circuit in the AMOLED pixel unit circuit.

The utility model content

The utility model embodiment provides a kind of active matrix organic light-emitting diode pixel unit circuit, and display panel, be used for realizing touch screen circuitry is integrated in the AMOLED pixel unit circuit, and make the AMOLED display panel with touch screen function.

A kind of active matrix organic light-emitting diode AMOLED pixel unit circuit that the utility model embodiment provides, comprise light emitting module, driver module, valve value compensation module, light emitting control module, touch sensible module and induced signal output module; Wherein,

Driver module, be used for the induced signal that the touch sensible module produces is amplified and passes through the output of induced signal output module, and drive light emitting module;

The light emitting control module, be used for controlling light emitting module luminous;

The valve value compensation module, be used for driver module is carried out threshold voltage compensation;

The touch sensible module, for generation of induced signal and export to driver module;

The induced signal output module, be used for the induced signal after driver module amplifies is exported.

A kind of display panel that the utility model embodiment provides comprises described AMOLED pixel unit circuit.

As seen through the above technical solutions, the utility model is newly-increased less circuit component in existing AMOLED pixel unit circuit,, by shared data line, circuit component and control signal etc., realized integrated TSP in Cell circuit in the AMOLED pixel unit circuit.

Description of drawings

Fig. 1 (a), Fig. 1 (b) are touch screen circuitry schematic diagram of the prior art;

Fig. 2 is AMOLED pixel unit circuit schematic diagram of the prior art;

Fig. 3 is a kind of AMOLED pixel unit circuit schematic diagram that the utility model embodiment provides;

Fig. 4 is a kind of AMOLED pixel unit circuit schematic diagram that another embodiment of the utility model provides;

Fig. 5 is the sequential chart of the control signal of the AMOLED pixel unit circuit that provides of the utility model embodiment;

Fig. 6 is the level graph of a relation of the control signal of the AMOLED pixel unit circuit that provides of the utility model embodiment.

Embodiment

The utility model embodiment provides a kind of active matrix organic light-emitting diode pixel unit circuit, and display panel, be used for realizing touch screen circuitry is integrated in the AMOLED pixel unit circuit, and make the AMOLED display panel with touch screen function.

Referring to Fig. 3, a kind of active matrix organic light-emitting diode AMOLED pixel unit circuit that the utility model embodiment provides, comprising: light emitting module 13, driver module 11, valve value compensation module 14, light emitting control module 12, touch sensible module 15 and induced signal output module 16; Wherein,

Driver module 11, be used for the induced signal that touch sensible module 15 produces is amplified and passes through 16 outputs of induced signal output module, and drive light emitting module 13;

Light emitting control module 12, be used for controlling light emitting module 13 luminous;

Valve value compensation module 14, be used for driver module 11 is carried out threshold voltage compensation;

Touch sensible module 15, for generation of induced signal and export to driver module 11;

Induced signal output module 16, be used for the induced signal output after driver module 11 amplifies.

Preferably, described driver module 11 comprises the first transistor T1, and its grid is connected with the first node P1 of this circuit, and the two poles of the earth are connected with the 3rd node P3 with the Section Point P2 of this circuit respectively in addition.

Preferably, described light emitting control module 12 comprises transistor seconds T2 and the 5th transistor T 5, wherein, the grid of transistor seconds T2 is connected with AMOLED pixel unit circuit the first control signal wire at the corresponding levels (corresponding to AMOLED pixel unit circuit the first control signal CR1_n at the corresponding levels), and the two poles of the earth are connected with the Section Point P2 of power lead (corresponding to power supply POWER) and this circuit respectively in addition; The grid of the 5th transistor T 5 is connected with AMOLED pixel unit circuit the second control signal wire at the corresponding levels (corresponding to AMOLED pixel unit circuit the second control signal CR2_n at the corresponding levels), in addition the two poles of the earth respectively with the 3rd node P3 of this circuit be connected light emitting module 13 and be connected.

Preferably, described light emitting module 13 comprises the first light emitting diode D1, and the one end is connected with described the 5th transistor T 5, and the other end is connected with low voltage level signal wire (corresponding to low voltage level signal VSS).

Preferably, described valve value compensation module 14 comprises the 3rd transistor T 3 and the first capacitor C 1;

Wherein, the grid of described the 3rd transistor T 3 is connected with AMOLED pixel unit circuit the 3rd control signal wire at the corresponding levels (corresponding to AMOLED pixel unit circuit the 3rd control signal CR3_n at the corresponding levels), in addition the two poles of the earth respectively with described Section Point P2 be connected first node P1 and be connected; Described the first capacitor C 1 is connected between described first node P1 and low voltage level signal wire (corresponding to low voltage level signal VSS).

Preferably, described touch sensible module 15 comprises the 6th transistor T 6 and the second light emitting diode D2; Wherein, the grid of described the 6th transistor T 6 is connected with upper level AMOLED pixel unit circuit the first control signal wire (corresponding to upper level AMOLED pixel unit circuit the first control signal CR1_n-1), in addition the two poles of the earth respectively with described the second light emitting diode D2 be connected first node P1 and be connected; The end of described the second light emitting diode D2 is connected with described the 6th transistor T 6, and the other end is connected with described low voltage level signal wire (corresponding to low voltage level signal VSS); Perhaps,

Referring to Fig. 4, described touch sensible module 15 comprises the 6th transistor T 6 and inductance capacitance C2; Wherein, the grid of described the 6th transistor T 6 is connected with upper level AMOLED pixel unit circuit the first control signal wire (corresponding to upper level AMOLED pixel unit circuit the first control signal CR1_n-1), in addition the two poles of the earth respectively with described inductance capacitance C2 be connected first node P1 and be connected.Inductance capacitance C2 one end is connected with the 6th transistor T 6, the other end need to the external world for example human body contact, rely on inductance capacitance coupling and capacitance variations to change the first capacitor C 1 voltage.

When the 6th transistor T 6 conducting, sensing element D2 or C2 could produce induction current and input the first transistor T1, and by the first transistor T1, are amplified and exported to data line through induced signal output module 16.

Touch sensible module 15 also shares capacitor C 1 as memory capacitance, and the common source line, and power lead is alternately inputted TSP in cell circuit and the required level of AMOLED circuit working.

In the utility model, sensing element has two kinds of embodiments, and as shown in Figure 3, described sensing element is photodiode to the first embodiment; As shown in Figure 4, described sensing element is inductance capacitance to the second embodiment.

Preferably, described induced signal output module 16 comprises the 4th transistor T 4, its grid is connected with AMOLED pixel unit circuit the second control signal wire at the corresponding levels (corresponding to AMOLED pixel unit circuit the second control signal CR2_n at the corresponding levels), in addition the two poles of the earth respectively with described data line (corresponding to data-signal DATA_OLED﹠amp; TSP) be connected the 3rd node P3 and connect.

Preferably, the anode of described the second light emitting diode D2 is connected with described low voltage level signal wire (corresponding to low voltage level signal VSS), and negative electrode is connected with the 6th transistor T 6.

Preferably, the anode of described the first light emitting diode D1 is connected with described the 5th transistor T 5, and negative electrode is connected with low voltage level signal wire (corresponding to low voltage level signal VSS).

Preferably, the first transistor T1, transistor seconds T2, the 3rd transistor T 3, the 5th transistor T 5 are N-type thin film transistor (TFT) TFT, and the 4th transistor T 4, the 6th transistor T 6 are P type TFT.

In the utility model, the value of the 3rd control signal VSS remains unchanged, and is specifically as follows the cut-off level of N-type TFT.

CR1_n-1 in the utility model embodiment, be the first control signal CR1_n-1 of the AMOLED pixel unit circuit at the corresponding levels first control signal wire input of lastrow pixel cell corresponding to current pixel unit.

The principle of work of the circuit that the utility model embodiment provides is described below in conjunction with Fig. 3, Fig. 5 and Fig. 6.

Be illustrated in figure 5 as the sequential of the control signal of the circuit that the utility model embodiment provides, the work of this circuit comprises six stages: initial Init stage, sensing Photo stage, read Read stage, charging Charge stage, write Write stage, Organic Light Emitting Diode OLED stage.V in Fig. 5 _DATAData line DATA_OLED﹠amp; The gray scale voltage of TSP, span are [V _DL, V _DH], under different gray scale voltages, D1 brightness is different.The magnitude relationship of the level value of each signal shown in Figure 5 as shown in Figure 6, VSS＜V _DL＜V _DH＜VINI＜VDD, the value of these level all pre-sets, and occurrence can arrange according to actual needs.Below stages is described respectively.

The Init stage: the T6 conducting, will amplify as the photodiode D2 access conduct of TSP Sensor the grid of the T1 of TFT.C1 is the memory capacitance of T1.T2～T4 conducting, POWER level are V _INI, carry out the initialization of TSP in cell circuit, be about to the grid memory capacitance precharge level initialization level V of amplifier transistor T1 _INI, to guarantee last stages T1, work in the saturation amplification state.

Photo stage: T3 cut-off, photodiode D2 detects the touch condition of panel Panel.By finger touch, external light source can't shine photodiode D2 as Panel, D2 be subjected to light less, the photoinduction leakage current is little, PHOTO stage C1 voltage is because the level that electric leakage produces changes less; Not by finger touch, external light source can shine photodiode D2 as Panel, and D2 is subjected to light, produces larger photoinduction leakage current, and PHOTO stage C1 voltage changes because electric leakage produces larger level.Therefore, if be touched, the relative initial voltage variation of the grid voltage of T1 is little; If be not touched, the relative initial voltage variation of the grid voltage of T1 is large.

The READ stage: PHOTO stage result is stored on C1.This moment the T3 remain off, T4 conducting, DATA_OLED﹠amp; TSP is at this moment as the sense wire of TSP in cell circuit output voltage, and T1 amplifies its grid voltage to output to sense wire, exports to peripheral TSP reading circuit.

Above 3 stages are TSP in Cell work, can respond to the extraneous induced signal that touches and export.Because T5 keeps closing, the current affects of D1 when above 3 stages can not be subject to the T2 unlatching is luminous.After TSP in Cell working stage finished, the T6 remain off, disconnected photodiode D2 and be connected with the T1 grid, and this circuit enters the AMOLED circuit working stage.

Charge stage: T5 cut-off, T2, T3 and T4 conducting, memory capacitance C1 is recharged, and the T1 grid level is V _DD, T1 can regard a diode as, enters state of saturation.

Write stage: T2, T5 cut-off, T3 and T4 conducting, DATA_OLED﹠amp at this moment; TSP is as the input of AMOLED data-signal, DATA_OLED﹠amp; TSP inputs V _DATAVoltage, namely the T1 source level is V _DATAC1 starts discharge through T1, T3, T4, until the T1 grid level is V _TH+ V _DATA, the gate source voltage V of T1 _GSReach the threshold voltage V of T1 _TH

OLED stage: T3 and T4 cut-off, T2 and T5 conducting, OLED starts luminous, and the T1 source level is the threshold voltage of D1 The electric current that flow through OLED this moment is

$I_{\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="HDA00003414243100031.png,HDA00003414243100041.png"\; state="\{\{state\}\}">T</figure-callout>}1}=\frac{k}{2}\&CenterDot;{[V_{\mathrm{TH}}+V_{\mathrm{DATA}}-V_{{\mathrm{TH}}_{\mathrm{OLED}}}-V_{\mathrm{TH}}-V_{\mathrm{SS}}]}^2$

$=\frac{k}{2}\&CenterDot;{[V_{\mathrm{DATA}}-V_{{\mathrm{TH}}_{\mathrm{OLED}}}-V_{\mathrm{SS}}]}^2$

Wherein, V _DATASpan be V _DLTo V _DH

The utility model embodiment also provides a kind of display panel, comprises described AMOLED pixel unit circuit.

In sum, the utility model embodiment is by sequential and the level value of each working signal of redesign, newly-increased less circuit component in existing AMOLED pixel unit circuit,, by shared data line, circuit component and control signal etc., realized integrated TSP in Cell circuit in the AMOLED pixel unit circuit.

Obviously, those skilled in the art can carry out various changes and modification and not break away from spirit and scope of the present utility model the utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model also is intended to comprise these changes and modification interior.

Claims (11)

1. an active matrix organic light-emitting diode AMOLED pixel unit circuit, is characterized in that, comprising: light emitting module, driver module, valve value compensation module, light emitting control module, touch sensible module and induced signal output module; Wherein,

Driver module, be used for the induced signal that the touch sensible module produces is amplified and passes through the output of induced signal output module, and drive light emitting module;

The light emitting control module, be used for controlling light emitting module luminous;

The valve value compensation module, be used for driver module is carried out threshold voltage compensation;

The touch sensible module, for generation of induced signal and export to driver module;

The induced signal output module, be used for the induced signal after driver module amplifies is exported.

2. circuit according to claim 1, it is characterized in that, described driver module comprises the first transistor, its grid is connected with the first node of this circuit, the two poles of the earth are connected with the 3rd node with the Section Point of this circuit respectively in addition, wherein, described first node is the tie point of driver module and valve value compensation module, described Section Point is the common tie point of driver module and light emitting control module, valve value compensation module, and described the 3rd node is the common tie point of driver module and light emitting control module, induced signal output module.

3. circuit according to claim 2, it is characterized in that, described light emitting control module comprises transistor seconds and the 5th transistor, wherein, the grid of transistor seconds is connected with AMOLED pixel unit circuit the first control signal wire at the corresponding levels, and the two poles of the earth are connected with the Section Point of power lead and this circuit respectively in addition; The 5th transistorized grid is connected with AMOLED pixel unit circuit the second control signal wire at the corresponding levels, in addition the two poles of the earth respectively with the 3rd node of this circuit be connected light emitting module and be connected.

4. circuit according to claim 3, is characterized in that, described light emitting module comprises the first light emitting diode, and the one end is connected with described the 5th transistor, and the other end is connected with the low voltage level signal wire.

5. circuit according to claim 4, is characterized in that, described valve value compensation module comprises the 3rd transistor and the first electric capacity;

Wherein, the described the 3rd transistorized grid is connected with AMOLED pixel unit circuit the 3rd control signal wire at the corresponding levels, in addition the two poles of the earth respectively with described Section Point be connected first node and be connected; Described the first electric capacity is connected between described first node and low voltage level signal wire.

6. circuit according to claim 5, is characterized in that, described touch sensible module comprises the 6th transistor and the second light emitting diode; Wherein, the described the 6th transistorized grid is connected with upper level AMOLED pixel unit circuit the first control signal wire, in addition the two poles of the earth respectively with described the second light emitting diode be connected first node and be connected; One end of described the second light emitting diode is connected with described the 6th transistor, and the other end is connected with described low voltage level signal wire; Perhaps,

Described touch sensible module comprises the 6th transistor and inductance capacitance; Wherein, the described the 6th transistorized grid is connected with upper level AMOLED pixel unit circuit the first control signal wire, in addition the two poles of the earth respectively with described inductance capacitance be connected first node and be connected; Described inductance capacitance.

7. circuit according to claim 6, it is characterized in that, described induced signal output module comprises the 4th transistor, and its grid is connected with AMOLED pixel unit circuit the second control signal wire at the corresponding levels, in addition the two poles of the earth respectively with described data line be connected the 3rd node and be connected.

8. circuit according to claim 6, is characterized in that, the anode of described the second light emitting diode is connected with described low voltage level signal wire, and negative electrode is connected with the 6th transistor.

9. circuit according to claim 4, is characterized in that, the anode of described the first light emitting diode is connected with described the 5th transistor, and negative electrode is connected with the low voltage level signal wire.

10. according to claim 2-9 described circuit of arbitrary claim, is characterized in that, the first transistor, transistor seconds, the 3rd transistor, the 5th transistor are N-type thin film transistor (TFT) TFT, and the 4th transistor, the 6th transistor are P type TFT.

11. a display panel, is characterized in that, comprises the described active matrix organic light-emitting diode AMOLED of the arbitrary claim of claim 1-10 pixel unit circuit.

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