CN203338718U - AMOLED drive circuit and display device - Google Patents

Abstract

The utility model provides an AMOLED drive circuit and a display device. The AMOLED drive circuit comprises a light emitting device, a drive unit for driving the light emitting device to emit light, a charging unit supplying voltage to the drive unit through a first node, and a control unit controlling the drive unit to charge the charging unit through the first node, a second node, and a third node. The control unit is connected with a data line and a control line and connected with the drive unit through the first, second, and third nodes. The charging unit is connected with the drive unit through the first node and connected with a second power supply. The drive unit is connected with one end of the light emitting device. The other end of the light emitting device is connected with a first power supply. According to the utility model, the problem that the AMOLED drive circuit is slow in speed and long in time when charging a capacitor is effectively solved and the AMOLED drive circuit is enabled to be suitable for AMOLED display of a high resolution ratio and a high refresh rate.

Description

A kind of AMOLED driving circuit and display device

Technical field

The utility model belongs to the display technique field, is specifically related to a kind of AMOLED driving circuit and display device.

Background technology

Along with the development of lcd technology, (Active Matrix Organic Light Emitting Diode, be called for short: application AMOLED) is more and more important for active matrix organic LED panel.The luminescent device of AMOLED is Organic Light Emitting Diode (Organic Light-Emitting Diode, hereinafter to be referred as OLED), AMOLED can luminously be that this drive current driving OLED is luminous by driving thin film transistor (TFT) to produce drive current under state of saturation.

At present, the AMOLED driving circuit adopts traditional 2T1C circuit usually, Fig. 1 is 2T1C circuit of the prior art, as shown in Figure 1, this 2T1C circuit comprises 1 switch transistor T 6,1 driving tube T3, luminescent device D1 and 1 capacitor C 1, and wherein the grid of switch transistor T 6 is connected with control line, and first utmost point of switch transistor T 6 is connected with data line, second utmost point of switch transistor T 6 respectively with the grid of an end of capacitor C 1 and driving tube T3 be connected, second utmost point of driving tube T3 and the first power supply V _dDconnect, first utmost point of driving tube T3 is connected with the end of luminescent device D1, the other end of luminescent device D1 and second source V _sSconnect the other end of capacitor C 1 and second source V _sSconnect.Control line is controlled voltage V for providing _sCAN, data line is for providing data voltage V _dATA.When controlling voltage V _sCANduring for high level, switch transistor T 6 is opened, and introduces data voltage, simultaneously data voltage V _dATAthe data current I produced _dATA capacitor C 1 is charged, and therefore capacitor C 1 has voltage, and when the rear control voltage that charged is low level, switch transistor T 6 is closed, and voltage when capacitor C 1 keeps charging, maintain driving tube T3 stable output electric current, i.e. drive current I _oLED, this drive current I _oLEDdrive luminescent device D1 luminous, now, the data current I that data voltage provides _dATAequal drive current I _oLED, and drive current I _oLEDbe operated in the scope of working current of luminescent device D1.

The inventor finds that in prior art, at least there are the following problems: as drive current I _oLEDwhile being operated in the current margin of OLED, be used to the data current I of capacitor charging _dATAalso less, and the electric capacity adopted due to the AMOLED driving circuit is large electric capacity, therefore AMOLED driving circuit of the prior art is slow and the duration of charging is long to the charging rate of electric capacity, thereby the AMOLED that this AMOLED driving circuit can only be applicable under low resolution shows, is not suitable for the AMOLED demonstration of high resolving power and high refreshing frequency.

The utility model content

The utility model provides a kind of AMOLED driving circuit and display device, can effectively solve the problem that the AMOLED driving circuit is slow to the charging rate of electric capacity and the duration of charging is long, the AMOLED that makes the AMOLED driving circuit be applicable under high resolving power and high refreshing frequency shows.

Provide a kind of AMOLED driving circuit for solving the utility model technical matters, this AMOLED driving circuit comprises: comprising: luminescent device, drive the luminous driver element of described luminescent device, by first node, for described driver element, provide the charhing unit of voltage, the control module described charhing unit charged by described first node, Section Point and the described driver element of the 3rd node control;

Described control module is connected with control line with data line, and described control module is connected with described driver element with described the 3rd node by described first node, described Section Point;

Described charhing unit is connected with described driver element by described first node, and described charhing unit is connected with second source;

Described driver element is connected with an end of described luminescent device; The other end of described luminescent device is connected with the first power supply.

Alternatively, described control module comprises: the first switching tube, second switch pipe and the 3rd switching tube;

The grid of the grid of the grid of described the first switching tube, described second switch pipe and described the 3rd switching tube is connected with described control line, first utmost point of described the first switching tube is connected with described data line with first utmost point of described second switch pipe, and second utmost point of described the first switching tube is connected with described Section Point with first utmost point with described the 3rd switching tube;

Second utmost point of described the 3rd switching tube is connected with the 3rd node; Second utmost point of described second switch pipe is connected with first node.

Alternatively, described driver element comprises: the first driving tube, the second driving tube and the 3rd driving tube;

The grid of the grid of described the first driving tube and the second driving tube is connected with described first node, and first utmost point of described the first driving tube is connected with described second source with first utmost point of the second driving tube; Second utmost point of the first driving tube is connected with described Section Point;

First utmost point of described the 3rd driving tube is connected with the 3rd node with second utmost point of described the second driving tube, and the grid of described the 3rd driving tube is connected with described first node, and second utmost point of described the 3rd driving tube is connected with an end of described luminescent device.

Alternatively, described charhing unit comprises memory capacitance, and an end of described memory capacitance connects first node, and the other end of described memory capacitance connects second source.

Alternatively, described luminescent device is organic electroluminescent device OLED.

Alternatively, described the first driving tube, described the second driving tube, described the 3rd driving tube, described the first switching tube, described second switch pipe and described the 3rd switching tube are N-type thin film transistor (TFT) or P type thin film transistor (TFT).

Alternatively, the ratio of the drive current of the data current of described data line and described luminescent device

wherein, K ₁be the current coefficient of the first driving tube, K ₂be the current coefficient of the second driving tube, K ₃be the current coefficient of the 3rd driving tube, I _dATAfor the data current that data line provides, I _oLEDfor flowing through the drive current of luminescent device.

For achieving the above object, the utility model provides a kind of display device to utility model, and this display device comprises above-mentioned AMOLED driving circuit.

A kind of AMOLED driving circuit and display device that the utility model provides, the AMOLED driving circuit comprises: control module, charhing unit, driver element and luminescent device; Control module is connected with control line with data line, and control module is connected with driver element with the 3rd node by first node, Section Point; Charhing unit is connected with driver element by first node, and charhing unit is connected with second source, and driver element is connected with an end of luminescent device, and the other end of luminescent device is connected with the first power supply; Control module is charged to charhing unit by first node, Section Point and the 3rd node control driver element, and charhing unit provides voltage by first node for driver element; The drive unit drives luminescent device is luminous, and it can effectively solve the problem that the AMOLED driving circuit is slow to the charging rate of electric capacity and the duration of charging is long, and the AMOLED that makes the AMOLED driving circuit be applicable under high resolving power and high refreshing frequency shows.

The accompanying drawing explanation

The structural representation that Fig. 1 is 2T1C driving circuit in prior art;

A kind of AMOLED driving circuit structure schematic diagram that Fig. 2 provides for the utility model embodiment mono-;

The schematic diagram that Fig. 3 is AMOLED driving circuit input voltage in embodiment mono-;

The schematic equivalent circuit that Fig. 4 is the AMOLED driving circuit charging stage in embodiment mono-;

The schematic equivalent circuit that Fig. 5 is AMOLED driving circuit discharge regime in embodiment mono-;

A kind of AMOLED driving circuit structure schematic diagram that Fig. 6 provides for the utility model embodiment bis-.

Embodiment

For making those skilled in the art understand better the technical solution of the utility model, a kind of AMOLED driving circuit and the display device that the utility model are provided below in conjunction with accompanying drawing are described in further detail.

The structural representation of a kind of AMOLED driving circuit that Fig. 2 provides for the utility model embodiment mono-, as shown in Figure 2, this AMOLED driving circuit comprises: control module, charhing unit, driver element and luminescent device D1.Wherein, control module is connected with control line with data line, and control module is connected with driver element with the 3rd node 3 by first node 1, Section Point 2; Charhing unit is connected with driver element by first node 1, and charhing unit is connected with second source VSS, and driver element is connected with the end of luminescent device D1, and the other end of luminescent device D1 is connected with the first power vd D; Control module is controlled driver element by first node 1, Section Point 2 and the 3rd node 3 charhing unit is charged, and charhing unit provides voltage by first node 1 for driver element; D1 is luminous for the drive unit drives luminescent device.

In the present embodiment, luminescent device D1 is Organic Light Emitting Diode OLED.The first driving tube T1, the second driving tube T2, the 3rd driving tube T3, the first switch transistor T 4, second switch pipe T5 and the 3rd switch transistor T 6 are the N-type thin film transistor (TFT), and first utmost point is as drain electrode, and second utmost point is as source electrode.

Particularly, control module comprises: the first switch transistor T 4, second switch pipe T5 and the 3rd switch transistor T 6.The grid of the grid of the first switch transistor T 4, second switch pipe T5 is connected with control line with the grid of the 3rd switch transistor T 6, the drain electrode of the first switch transistor T 4 is connected with data line with the drain electrode of second switch pipe T5, and the source electrode of the first switch transistor T 4 is connected with Section Point 2 with the drain electrode with the 3rd switch transistor T 6; The source electrode of the 3rd switch transistor T 6 is connected with the 3rd node 3; The source electrode of second switch pipe T5 is connected with first node 1.

Particularly, driver element comprises: the first driving tube T1, the second driving tube T2 and the 3rd driving tube T3.Wherein, the grid of the grid of the first driving tube T1 and the second driving tube T2 is connected with first node 1, and the source electrode of the source electrode of the first driving tube T1 and the second driving tube T2 is connected with second source VSS; The drain electrode of the first driving tube T1 is connected with Section Point 2; The drain electrode of the source electrode of the 3rd driving tube T3 and the second driving tube T2 is connected with the 3rd node 3; The grid of the 3rd driving tube T3 is connected with first node 1, and the drain electrode of the 3rd driving tube T3 is connected with the end of luminescent device D1.

Particularly, charhing unit comprises memory capacitance C1, and the end of memory capacitance C1 connects first node 1, and the other end of memory capacitance C1 connects second source VSS.

In the present embodiment, when the first driving tube T1, the second driving tube T2, the 3rd driving tube T3, the first switch transistor T 4, second switch pipe T5 and the 3rd switch transistor T 6 are the N-type thin film transistor (TFT), the drain electrode of the 3rd driving tube T3 is connected with the end of luminescent device D1, and the other end of luminescent device D1 is connected with the first power supply.The voltage that the first power supply provides is V _dD, the voltage that second source provides is reference voltage V _sS, the voltage that the first power supply provides can be higher than reference voltage, wherein, and V _dDcan be high level, correspondingly, as the V of reference voltage _sSit can be low level.The voltage that data line provides is V _dATA, the voltage that control line provides is V _sCAN.

Below in conjunction with shown in Fig. 3 to Fig. 5, the course of work of AMOLED driving circuit in the present embodiment is described in detail.The schematic diagram that Fig. 3 is AMOLED driving circuit input voltage in Fig. 2, as shown in Figure 3, the a stage represents the charging stage of AMOLED driving circuit, the b stage represents the glow phase of AMOLED driving circuit, the schematic equivalent circuit that Fig. 4 is the AMOLED driving circuit charging stage in Fig. 2, the schematic equivalent circuit that Fig. 5 is AMOLED driving circuit glow phase in Fig. 2.The voltage V provided when control line _sCANduring for high level, the first switch transistor T 4, second switch pipe T5 and the 3rd switch transistor T 6 are all opened, the first switch transistor T 4, the first switch transistor T 5 and the first switch transistor T 6 conductings, now, in Fig. 2 the schematic equivalent circuit of AMOLED driving circuit charging stage as shown in Figure 4, the data current I that data line provides _dATAsimultaneously to capacitor C 1 charging.

Charging stage, i.e. charging stage of AMOLED driving circuit, referring to Fig. 4, the first driving tube T1 and the second driving tube T2 conducting in parallel, V _{g_T3}be the grid voltage of the 3rd driving tube T3, V _{g_T2}be grid voltage, the V of the second driving tube T2 _{d_T2}be the drain voltage of the second driving tube T2, V _{s_T3}be the source voltage of the 3rd driving tube T3, V _{g_T3}=V _{g_T2}=V _{d_T2}=V _{s_T3}, now, the 3rd driving tube T3 closes,

wherein, K ₁be the current coefficient of the first driving tube T1, K ₂the current coefficient that the second driving tube is T2, I _dATAfor the data current that data line provides, I _oLEDfor flowing through the drive current of luminescent device D1, V _gSbe the public grid voltage of the first driving tube T1 and the second driving tube T2, the threshold voltage of the first driving tube T1, the second driving tube T2, the 3rd driving tube T3 equates, is V _tH.

Glow phase, referring to Fig. 5, the second driving tube T2 and the 3rd driving tube T3 series connection conducting, wherein the second driving tube T2 is operated in linear zone, and the 3rd driving tube is operated in saturation region.I _oLED=I _{dS_T2}=I _{dS_T3}, I wherein _oLEDfor flowing through the drive current of luminescent device D1, I _{dS_T2}for flowing through the source-drain current of the second driving tube T2, I _{dS_T3}for flowing through the source-drain current of the 3rd driving tube T3;

Now, $I_{\mathrm{DS}\_\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}2}={\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2\&CenterDot;(V_{\mathrm{GS}}-V_{\mathrm{TH}})\&CenterDot;V_{\mathrm{DS}\_T2}-\frac{1}{2}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2\&CenterDot;{V_{\mathrm{DS}\_\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}2}}^2,$ Wherein, V _{dS_T2}it is the source-drain voltage of the second driving tube;

wherein, V _{gS_T3}be the gate source voltage of the 3rd driving tube, K ₃be the current coefficient of the 3rd driving tube T3;

, ${\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2\&CenterDot;(V_{\mathrm{GS}}-V_{\mathrm{TH}})\&CenterDot;V_{\mathrm{DS}\_T2}-\frac{1}{2}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2\&CenterDot;{V_{\mathrm{DS}\_\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}2}}^2=\frac{1}{2}{\mathrm{<figure-callout\; id="3"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_3\&CenterDot;{(V_{\mathrm{GS}\_T3}-V_{\mathrm{TH}})}^2$

Because, V _{gS_T3}+ V _{dS_T2}=V _gS, V _{dS_T2}=V _gS-V _{gS_T3},

So, $I_{\mathrm{DS}\_\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}2}={\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2\&CenterDot;(V_{\mathrm{GS}}-V_{\mathrm{TH}})\&CenterDot;(V_{\mathrm{GS}}-V_{\mathrm{GS}\_T3})-\frac{1}{2}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2\&CenterDot;{(V_{\mathrm{GS}}-V_{\mathrm{GS}\_T3})}^2$

$=\frac{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}{2}\&CenterDot;[2\&CenterDot;(V_{\mathrm{GS}}-V_{\mathrm{TH}})\&CenterDot;(V_{\mathrm{GS}}-V_{\mathrm{GS}\_T3})-{(V_{\mathrm{GS}}-V_{\mathrm{GS}\_T3})}^2]$

$=\frac{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}{2}\&CenterDot;[2\&CenterDot;({V_{\mathrm{GS}}}^2-V_{\mathrm{TH}}\&CenterDot;V_{\mathrm{GS}}-V_{\mathrm{GS}}\&CenterDot;V_{\mathrm{GS}\_\mathrm{<figure-callout\; id="3"\; label="T"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}3}+V_{\mathrm{GS}\_\mathrm{<figure-callout\; id="3"\; label="T"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}3}\&CenterDot;V_{\mathrm{TH}})-({V_{\mathrm{GS}}}^2-2\&CenterDot;V_{\mathrm{GS}\_\mathrm{<figure-callout\; id="3"\; label="T"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}3}\&CenterDot;V_{\mathrm{GS}}+{V_{\mathrm{GS}\_\mathrm{<figure-callout\; id="3"\; label="T"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}3}}^2)$

$=\frac{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}{2}[{V_{\mathrm{GS}}}^2-2V_{\mathrm{TH}}\&CenterDot;V_{\mathrm{GS}}+{V_{\mathrm{TH}}}^2-{{\mathrm{<figure-callout\; id="2"\; label="V\; TH"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">V</figure-callout>}}_{\mathrm{TH}}}^2+2V_{\mathrm{GS}\_\mathrm{<figure-callout\; id="3"\; label="T"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}3}\&CenterDot;V_{\mathrm{TH}}-{V_{\mathrm{GS}\_\mathrm{<figure-callout\; id="3"\; label="T"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}3}}^2]$

$=\frac{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}{2}{(V_{\mathrm{GS}}-V_{\mathrm{TH}})}^2-\frac{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}{2}{(V_{\mathrm{GS}\_T3}-V_{\mathrm{TH}})}^2$

$=\frac{K_2}{({\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2+K_1)}\&CenterDot;\frac{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2+{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_1}{2}{(V_{\mathrm{GS}}-V_{\mathrm{TH}})}^2-\frac{K_2}{{\mathrm{<figure-callout\; id="3"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_3}\&CenterDot;\frac{{\mathrm{<figure-callout\; id="3"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_3}{2}{(V_{\mathrm{GS}\_T3}-V_{\mathrm{TH}})}^2$

$=\frac{K_2}{{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}\&CenterDot;I_{\mathrm{DATA}}-\frac{K_2}{{\mathrm{<figure-callout\; id="3"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_3}\&CenterDot;I_{\mathrm{DS}\_\mathrm{<figure-callout\; id="3"\; label="T"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}3}$

Thereby, $I_{\mathrm{DS}\_\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}2}=\frac{K_2}{{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}\&CenterDot;I_{\mathrm{DATA}}-\frac{K_2}{{\mathrm{<figure-callout\; id="3"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_3}\&CenterDot;I_{\mathrm{DS}\_\mathrm{<figure-callout\; id="3"\; label="T"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}3}$

$I_{\mathrm{OLED}}=\frac{K_2}{{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}\&CenterDot;I_{\mathrm{DATA}}-\frac{K_2}{{\mathrm{<figure-callout\; id="3"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_3}\&CenterDot;I_{\mathrm{DS}\_\mathrm{<figure-callout\; id="3"\; label="T"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">T</figure-callout>}3}$

Due to, I _oLED=I _{dS_T2}=I _{dS_T3},

$\frac{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2+K_3}{{\mathrm{<figure-callout\; id="3"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_3}\&CenterDot;I_{\mathrm{OLED}}=\frac{K_2}{{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2}\&CenterDot;I_{\mathrm{DATA}}$

$I_{\mathrm{DATA}}/I_{\mathrm{OLED}}=\frac{({\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2+K_1)\&CenterDot;({\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2+K_3)}{{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA00003361748800012.png,HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_2\&CenterDot;{\mathrm{<figure-callout\; id="3"\; label="K"\; filenames="HDA00003361748800041.png"\; state="\{\{state\}\}">K</figure-callout>}}_3}$

Wherein, K ₁be the current coefficient of the first driving tube, K ₂be the current coefficient of the second driving tube, K ₃be the current coefficient of the 3rd driving tube, I _dATAfor the data current that data line provides, I _oLEDfor flowing through the drive current of luminescent device.

Derivation from above-mentioned formula, because the second driving tube T2, the 3rd driving tube T3 and luminescent device D1 connect mutually, the source-drain current that flows through the second driving tube T2 and the source-drain current that flows through the 3rd driving tube T3 and the drive current that flows through luminescent device D1 equate, i.e. I _oLED=I _{dS_T2}=I _{dS_T3}, the public grid voltage of the first driving tube T1 and the second driving tube T2 equals the source-drain voltage sum of gate source voltage and the second driving tube T2 of the 3rd driving tube T3, i.e. V _{gS_T3}+ V _{dS_T2}=V _gS, therefore, in above-mentioned derivation, V _gS, V _tHbe cancelled, i.e. I _dATAwith I _oLEDratio depend on the current coefficient K of the first driving tube T1 ₁, the second driving tube T2 current coefficient K ₂current coefficient K with the 3rd driving tube ₃value.

B stage as shown in Figure 3, i.e. the discharge regime of AMOLED driving circuit, now luminescent device is luminous, the voltage V that control line provides _sCANfor low level, the 4th switch transistor T 4, the 5th switch transistor T 5 and the 6th switch transistor T 6 are all closed, and now, in Fig. 2, the schematic equivalent circuit of AMOLED driving circuit discharge regime as shown in Figure 5.Ratio according to above-mentioned data current and drive current

from formula, by selecting K ₁, K ₂and K ₃value, can be so that I _dATAwith I _oLEDlarge ratio is arranged, when guaranteeing that drive current is operated in the current margin of luminescent device D1, larger data current I can be arranged _dATAthereby, accelerate the charging rate to capacitor C 1.

The AMOLED driving circuit that the present embodiment provides comprises: control module, charhing unit, driver element and luminescent device; Control module is connected with control line with data line, and control module is connected with driver element with the 3rd node by first node, Section Point; Charhing unit is connected with driver element by first node, and charhing unit is connected with second source, and driver element is connected with an end of luminescent device, and the other end of luminescent device is connected with the first power supply; Control module is charged to charhing unit by first node, Section Point and the 3rd node control driver element, and charhing unit provides voltage by first node for driver element; The drive unit drives luminescent device is luminous, and it can effectively solve the AMOLED pixel because the slow problem of charging rate of the little generation of charging current makes AMOLED show and goes for high resolving power and high refreshing frequency environment.

Fig. 6 implements the two a kind of AMOLED driving circuits that provide for the utility model, and as shown in Figure 6, this driving circuit comprises: this AMOLED driving circuit comprises: control module, charhing unit, driver element and luminescent device D1.Particularly, control module comprises: the first switch transistor T 4, second switch pipe T5 and the 3rd switch transistor T 6; Charhing unit comprises memory capacitance C1; Driver element comprises: the first driving tube T1, the second driving tube T2 and the 3rd driving tube T3.Wherein, control module is connected with control line with data line, and control module is connected with driver element with the 3rd node 3 by first node 1, Section Point 2; Charhing unit is connected with driver element by first node 1, and charhing unit is connected with second source VDD, and driver element is connected with the end of luminescent device D1, and the other end of luminescent device D1 is connected with the first power supply VSS; Control module is controlled driver element by first node 1, Section Point 2 and the 3rd node 3 charhing unit is charged, and charhing unit provides voltage by first node 1 for driver element; D1 is luminous for the drive unit drives luminescent device.

In the present embodiment, luminescent device D1 is Organic Light Emitting Diode OLED.The first driving tube T1, the second driving tube T2, the 3rd driving tube T3, the first switch transistor T 4, second switch pipe T5 and the 3rd switch transistor T 6 are P type thin film transistor (TFT), and first utmost point is as source electrode, and second utmost point is as drain electrode.

Particularly, control module comprises: the first switch transistor T 4, second switch pipe T5 and the 3rd switch transistor T 6.The grid of the grid of the first switch transistor T 4, second switch pipe T5 is connected with control line with the grid of the 3rd switch transistor T 6, the source electrode of the first switch transistor T 4 is connected with data line with the source electrode of second switch pipe T5, and the drain electrode of the first switch transistor T 4 is connected with Section Point 2 with the source electrode with the 3rd switch transistor T 6; The drain electrode of the 3rd switch transistor T 6 is connected with the 3rd node 3; The drain electrode of second switch pipe T5 is connected with first node 1.

Particularly, driver element comprises: the first driving tube T1, the second driving tube T2 and the 3rd driving tube T3.Wherein, the grid of the grid of the first driving tube T1 and the second driving tube T2 is connected with first node 1, and the drain electrode of the drain electrode of the first driving tube T1 and the second driving tube T2 is connected with second source VDD; The source electrode of the first driving tube T1 is connected with Section Point 2; The source electrode of the drain electrode of the 3rd driving tube T3 and the second driving tube T2 is connected with the 3rd node 3; The grid of the 3rd driving tube T3 is connected with first node 1, and the source electrode of the 3rd driving tube T3 is connected with the end of luminescent device D1.

Particularly, charhing unit comprises memory capacitance C1, and the end of memory capacitance C1 connects first node 1, and the other end of memory capacitance C1 connects second source VDD.

In the present embodiment, when the first driving tube T1, the second driving tube T2, the 3rd driving tube T3, the first switch transistor T 4, second switch pipe T5 and the 3rd switch transistor T 6 are P type thin film transistor (TFT), the drain electrode of the 3rd driving tube T3 is connected with the end of luminescent device D1, and the other end of luminescent device D1 is connected with the first power supply.The voltage that the first power supply provides is reference voltage V _sS, the voltage that second source provides is V _dD, the voltage that second source provides can be higher than reference voltage, wherein, and V _dDcan be high level, correspondingly, as the V of reference voltage _sSit can be low level.The voltage that data line provides is V _dATA, the voltage that control line provides is V _sCAN.

The charging stage of the AMOLED driving circuit of the present embodiment AMOLED driving circuit in the principle of work of charging stage and discharge regime refers to embodiment mono-and the principle of work of discharge regime repeat herein no longer one by one.

The difference of the AMOLED driving circuit in embodiment mono-and embodiment bis-is, the thin film transistor (TFT) in embodiment bis-is P type thin film transistor (TFT), and the voltage that second source provides is V _dD, the voltage that the first power supply provides is reference voltage V _sS, the voltage that second source provides can be higher than reference voltage.Wherein, V _dDcan be high level, correspondingly, as the V of reference voltage _sSit can be low level.

The AMOLED driving circuit that the present embodiment provides comprises: control module, charhing unit, driver element and luminescent device, it can effectively solve the AMOLED pixel because the slow problem of charging rate of the little generation of charging current makes AMOLED show and goes for high resolving power and high refreshing frequency environment.

The AMOLED driving circuit that above-described embodiment one and embodiment bis-provide is mainly used in driving AMOLED.The AMOLED driving circuit provided for above-described embodiment one and embodiment bis-, in practical application, be not only applicable to polycrystalline SiTFT, applicable to other transistors yet.

It should be noted that, in the utility model, in the first driving tube T1, the second driving tube T2, the 3rd driving tube T3, the first switch transistor T 4, second switch pipe T5 and the 3rd switch transistor T 6 each transistors, 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.During practical application, for a transistor, the position according to this transistor in circuit and effect, 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 tri-provides a kind of driving method, and this driving method can be based on the AMOLED driving circuit, and this AMOLED driving circuit comprises control module, charhing unit, driver element and luminescent device, and this driving method comprises:

Step 101, described control module are controlled described driver element described charhing unit are charged.

Particularly, control module comprises the first switching tube, second switch pipe and the 3rd switching tube; Driver element comprises the first driving tube, the second driving tube and the 3rd driving tube; Charhing unit comprises memory capacitance.Control module is controlled described driver element described charhing unit is charged and specifically comprises: the first switching tube, second switch pipe, the 3rd switching tube are opened under the control of control line, the first driving tube and the second driving tube conducting, the 3rd driving tube is closed, so that data line charges to memory capacitance by the first driving tube and the second driving tube parallel connection.

Step 102, described charhing unit provide voltage, the described luminescent device of described drive unit drives luminous for described driver element.

Particularly, control module comprises the first switching tube, second switch pipe and the 3rd switching tube; Driver element comprises the first driving tube, the second driving tube and the 3rd driving tube; Charhing unit comprises memory capacitance.Charhing unit specifically comprises for driver element provides voltage, the drive unit drives luminescent device is luminous: the first switching tube, second switch pipe, the 3rd switching tube are closed under the control of control line, memory capacitance provides grid voltage for the second driving tube and the 3rd driving tube, and the second driving tube and the 3rd driving tube tandem drive luminescent device are luminous.

The driving method of the present embodiment three can be based in above-described embodiment one or embodiment bis-the AMOLED driving circuit realize, its embodiment refers to above-described embodiment one or embodiment bis-, repeats no more herein.

The AMOLED driving method that the present embodiment three provides, this AMOLED driving method is based on the AMOLED driving circuit, the AMOLED driving circuit comprises: control module, charhing unit, driver element and luminescent device, control module is controlled driver element charhing unit is charged, charhing unit provides voltage, drive unit drives luminescent device luminous for driver element, it can effectively solve the problem that the AMOLED driving circuit is slow to the charging rate of electric capacity and the duration of charging is long, and the AMOLED that makes the AMOLED driving circuit be applicable under high resolving power and high refreshing frequency shows.

The utility model embodiment tetra-provides a kind of display device, adopts the AMOLED driving circuit in above-described embodiment one or embodiment bis-, and its embodiment refers to above-described embodiment one or embodiment bis-, no longer specifically describes herein.

The display device that the present embodiment provides, adopt the AMOLED driving circuit, this AMOLED driving circuit comprises: control module, charhing unit, driver element and luminescent device, it can effectively solve the AMOLED pixel because the slow problem of charging rate of the little generation of charging current makes AMOLED show and goes for high resolving power and high refreshing frequency environment.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 (8)

1. an AMOLED driving circuit, it is characterized in that, comprising: luminescent device, drive the luminous driver element of described luminescent device, by first node, for described driver element, provide the charhing unit of voltage, the control module described charhing unit charged by described first node, Section Point and the described driver element of the 3rd node control;

Described control module is connected with control line with data line, and described control module is connected with described driver element with described the 3rd node by described first node, described Section Point;

Described charhing unit is connected with described driver element by described first node, and described charhing unit is connected with second source;

Described driver element is connected with an end of described luminescent device; The other end of described luminescent device is connected with the first power supply.

2. AMOLED driving circuit according to claim 1, is characterized in that, described control module comprises: the first switching tube, second switch pipe and the 3rd switching tube;

The grid of the grid of the grid of described the first switching tube, described second switch pipe and described the 3rd switching tube is connected with described control line, first utmost point of described the first switching tube is connected with described data line with first utmost point of described second switch pipe, and second utmost point of described the first switching tube is connected with described Section Point with first utmost point with described the 3rd switching tube;

Second utmost point of described the 3rd switching tube is connected with the 3rd node; Second utmost point of described second switch pipe is connected with first node.

3. AMOLED driving circuit according to claim 2, is characterized in that, described driver element comprises: the first driving tube, the second driving tube and the 3rd driving tube;

The grid of the grid of described the first driving tube and the second driving tube is connected with described first node, and first utmost point of described the first driving tube is connected with described second source with first utmost point of the second driving tube; Second utmost point of the first driving tube is connected with described Section Point;

First utmost point of described the 3rd driving tube is connected with the 3rd node with second utmost point of described the second driving tube; The grid of described the 3rd driving tube is connected with described first node, and second utmost point of described the 3rd driving tube is connected with an end of described luminescent device.

4. AMOLED driving circuit according to claim 3, is characterized in that, described charhing unit comprises memory capacitance, and an end of described memory capacitance connects first node, and the other end of described memory capacitance connects second source.

5. AMOLED driving circuit according to claim 4, is characterized in that, described luminescent device is Organic Light Emitting Diode OLED.

6. AMOLED driving circuit according to claim 5, it is characterized in that, described the first driving tube, described the second driving tube, described the 3rd driving tube, described the first switching tube, described second switch pipe and described the 3rd switching tube are N-type thin film transistor (TFT) or P type thin film transistor (TFT).

7. AMOLED driving circuit according to claim 6, is characterized in that, the ratio of the data current of described data line and the drive current of described luminescent device

wherein, K ₁be the current coefficient of the first driving tube, K ₂be the current coefficient of the second driving tube, K ₃be the current coefficient of the 3rd driving tube, I _dATAfor the data current that data line provides, I _oLEDfor flowing through the drive current of luminescent device.

8. a display device, is characterized in that, comprises the arbitrary described AMOLED driving circuit of claim 1 to 7.

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