CN203300192U - Active matrix organic light-emitting diode (AMOLED) pixel unit circuit and display panel - Google Patents

Abstract

The embodiment of the utility model provides an 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, a charging module which is used for charging the threshold compensation 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

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, charging 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;

Charging module, be used to the charging of valve value compensation module;

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, increase less circuit component newly in the utility model 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, comprise light emitting module 13, driver module 11, charging module 15, valve value compensation module 14, light emitting control module 12, touch sensible module 16 and induced signal output module 17; Wherein,

Driver module 11, be used for the induced signal that touch sensible module 16 produces is amplified and passes through 17 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;

Charging module 15, be used to 14 chargings of valve value compensation module;

Touch sensible module 16, for generation of induced signal and export to driver module 11;

Induced signal output module 17, 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 described valve value compensation module 14, particularly as shown in Figure 3, connect by the P3 node, the two poles of the earth are connected with Section Point P2 with the first node P1 of described light emitting control module 12 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 and AMOLED pixel unit circuit secondary signal control line at the corresponding levels (corresponding AMOLED pixel unit circuit secondary signal CR2_n at the corresponding levels) connect, in addition the two poles of the earth respectively with power lead (corresponding power control signal POWER) be connected first node P1 and be connected; The grid of the 5th transistor T 5 is connected with AMOLED pixel unit circuit secondary signal control line at the corresponding levels, and the two poles of the earth are connected with the low voltage level signal wire with described Section Point P2 respectively in addition.

Preferably, described light emitting module 13 comprises the first light emitting diode D1, and the one end is connected with described Section Point P2, and the other end connects with low voltage level signal wire (corresponding low voltage level signal VSS).

Preferably, described valve value compensation module 14 comprises the 4th transistor T 4, the first capacitor C 1 and the second capacitor C 2;

Wherein, the grid of described the 4th transistor T 4 and AMOLED pixel unit circuit first signal control line at the corresponding levels (corresponding AMOLED pixel unit circuit first signal CR1_n at the corresponding levels) connect, in addition the two poles of the earth respectively with described first node P1 be connected the grid of the first transistor T1 and be connected; Described the first capacitor C 1 is connected between the grid and described Section Point P2 of described the first transistor T1, and described the second capacitor C 2 is connected between the grid of described charging module 15 and described the first transistor T1.

Preferably, described charging module 15 comprises the 3rd transistor T 3, its grid and AMOLED pixel unit circuit the 3rd signal control line at the corresponding levels (corresponding the 4th control signal CR3_n) connect, in addition the two poles of the earth respectively with described data line (corresponding data signal DATA_OLED﹠amp; TSP) connect with second capacitor C 2 of being connected in valve value compensation module 14.

Preferably, described touch sensible module 16 comprises the 7th transistor T 7 and the second light emitting diode D2; Wherein, the grid of described the 7th transistor T 7 and upper level AMOLED pixel unit circuit the 3rd signal control line (corresponding upper level AMOLED pixel unit circuit the 3rd signal CR3_n-1) connect, in addition the two poles of the earth respectively with described the second light emitting diode D2 be connected the grid of the first transistor T1 and be connected; The end of described the second light emitting diode D2 is connected with described the 7th transistor T 7, and the other end is connected with described low voltage level signal wire; Perhaps,

Referring to Fig. 4, described touch sensible module comprises the 7th transistor T 7 and inductance capacitance C3; Wherein, the grid of described the 7th transistor T 7 is connected with upper level AMOLED pixel unit circuit the 3rd signal control line, in addition the two poles of the earth respectively with described inductance capacitance C3 be connected the grid of the first transistor T1 and be connected.Inductance capacitance C3 one end is connected with the 7th transistor T 7, the other end need to the external world for example human body contact, rely on inductance capacitance coupling and capacitance variations to change the voltage of the first capacitor C 1.

Preferably, described induced signal output module 17 comprises the 6th transistor T 6, and its grid is connected with upper level AMOLED pixel unit circuit the 3rd signal control line, in addition the two poles of the earth respectively with described data line be connected first node P1 and be connected.

Preferably, the anode of described the second light emitting diode D2 is connected with described low voltage level signal wire, and negative electrode is connected with the 7th transistor T 7.

Preferably, the anode of described the first light emitting diode D1 is connected with described Section Point P2, and negative electrode is connected with the low voltage level signal wire.

Preferably, the first transistor T1, transistor seconds T2, the 3rd transistor T 3, the 4th transistor T 4, the 6th transistor T 6, the 7th transistor T 7 are N-type thin film transistor (TFT) TFT, and the 5th transistor T 5 is P type TFT.

Described touch sensible module 16 is amplified output through the first transistor T1 after producing induced signal, and the 6th transistor T 6 conductings this moment, to data line, are read by data line the current delivery of the first transistor T1 output to touching the signal that produces.

When the 7th transistor T 7 conducting, sensing element D2 or C3 could produce induced signal and input the first transistor T1.

Touch sensible module 16 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.

The second control signal VSS described in the utility model embodiment is cut-off level, and its level value remains unchanged.

Structure shown in Figure 4 and structure shown in Figure 3, difference comprises when described sensing element is inductance capacitance, inductance capacitance one end is connected with the 7th transistor, 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 capacitance voltage, the other parts annexation is as broad as long.

Provide the explaining of specific works principle of the circuit that the utility model embodiment provides below in conjunction with Fig. 3, Fig. 5 and Fig. 6.

As shown in Figure 5, the circuit that the utility model embodiment provides comprises six working stages to the sequential relationship of the working signal in the utility model embodiment: 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.Below stages is described respectively.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.

The Init stage: the T7 conducting, will amplify the grid of the T1 of TFT as the photodiode D2 access conduct of TSP Sensor, C1 is for amplifying the memory capacitance of TFT T1.T2 and T4 conducting, POWER level are V _INI, carry out the initialization of TSP, be about to connect the memory capacitance C1 precharge level initialization level V of the grid of T1 _INI, to guarantee last stages T1, work in the saturation amplification state.

Photo stage: T2, T4 cut-off, the T7 conducting.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, T6 was conducting, T3, T4 cut-off, DATA_OLED﹠amp; TSP is at this moment as the sense wire of TSP Output rusults, and T1 outputs to its grid voltage amplification to read line taking, 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.After TSP in Cell working stage finished, this circuit entered the AMOLED circuit working stage.

Charge stage: T6, the T7 cut-off; At first, T2, T4 conducting, POWER is than V _DDSlightly low V _INI, C1 voltage is V _INIThen, T2, T4 cut-off, C1 is discharged to the threshold voltage V that voltage is T1 _TH

The Write stage: at first T3 conducting, data line input gray scale voltage V _DATA, then input V _INIC1 voltage is that the T1 grid voltage becomes $V_{\mathrm{TH}}+(V_{\mathrm{INI}}-V_{\mathrm{DATA}})\&CenterDot;\frac{C_2}{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA00003412689700031.png,HDA00003412689700041.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+C_2}.$

The OLED stage: the T2 conducting, T3, T5 cut-off, T1 work, D1 is luminous.The size of current of T1 output is:

$I_{\mathrm{Tl}}=k\&CenterDot;{\&lsqb;V_{\mathrm{TH}}+(V_{\mathrm{INI}}-V_{\mathrm{DATA}})\&CenterDot;\frac{C_2}{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA00003412689700031.png,HDA00003412689700041.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+C_2}-V_{\mathrm{TH}}\&rsqb;}^2=k\&CenterDot;{\&lsqb;(V_{\mathrm{INI}}-V_{\mathrm{DATA}})\&CenterDot;\frac{C_2}{{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HDA00003412689700031.png,HDA00003412689700041.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+C_2}\&rsqb;}^2;$

Wherein, k is the constant that sets in advance, V _DATASpan be V _DLTo V _DH

The utility model embodiment also provides a kind of display panel, comprises above-mentioned 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 (12)

1. an active matrix organic light-emitting diode AMOLED pixel unit circuit, is characterized in that, comprising: light emitting module, driver module, charging 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;

Charging module, be used to the charging of valve value compensation module;

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

3. circuit as claimed in 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 secondary signal control line at the corresponding levels, in addition the two poles of the earth respectively with power lead be connected first node and be connected; The 5th transistorized grid is connected with AMOLED pixel unit circuit secondary signal control line at the corresponding levels, and the two poles of the earth are connected with the low voltage level signal wire with described Section Point respectively in addition.

4. circuit as claimed in claim 3, is characterized in that, described light emitting module comprises the first light emitting diode, and the one end is connected with described Section Point, and the other end is connected with the low voltage level signal wire.

5. circuit as claimed in claim 4, is characterized in that, described valve value compensation module comprises the 4th transistor, the first electric capacity and the second electric capacity;

Wherein, the described the 4th transistorized grid is connected with AMOLED pixel unit circuit first signal control line at the corresponding levels, in addition the two poles of the earth respectively with described first node be connected the grid of the first transistor and be connected; Described the first electric capacity is connected between the grid and described Section Point of described the first transistor, and described the second electric capacity is connected between the grid of described charging module and described the first transistor.

6. circuit as claimed in claim 5, it is characterized in that, described charging module comprises the 3rd transistor, and its grid is connected with AMOLED pixel unit circuit the 3rd signal control line at the corresponding levels, and the two poles of the earth are connected with second electric capacity of being connected in the valve value compensation module with described data line respectively in addition.

7. circuit as claimed in claim 6, is characterized in that, described touch sensible module comprises the 7th transistor and the second light emitting diode; Wherein, the described the 7th transistorized grid is connected with upper level AMOLED pixel unit circuit the 3rd signal control line, in addition the two poles of the earth respectively with described the second light emitting diode be connected the grid of the first transistor and be connected; One end of described the second light emitting diode is connected with described the 7th transistor, and the other end is connected with described low voltage level signal wire; Perhaps,

Described touch sensible module comprises the 7th transistor and inductance capacitance; Wherein, the described the 7th transistorized grid is connected with upper level AMOLED pixel unit circuit the 3rd signal control line, in addition the two poles of the earth respectively with described inductance capacitance be connected the grid of the first transistor and be connected; Described inductance capacitance.

8. circuit as claimed in claim 7, it is characterized in that, described induced signal output module comprises the 6th transistor, and its grid is connected with upper level AMOLED pixel unit circuit the 3rd signal control line, in addition the two poles of the earth respectively with described data line be connected first node and be connected.

9. circuit as claimed in claim 7, 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 7th transistor.

10. circuit as claimed in claim 4, is characterized in that, the anode of described the first light emitting diode is connected with described Section Point, and negative electrode is connected with the low voltage level signal wire.

11. the described circuit of claim as arbitrary in claim 2-10 is characterized in that the first transistor, transistor seconds, the 3rd transistor, the 4th transistor, the 6th transistor, the 7th transistor are N-type thin film transistor (TFT) TFT, the 5th transistor is P type TFT.

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

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