CN103268755B - Active organic light emitting array driving system and driving method - Google Patents

Abstract

The invention provides an active organic light emitting array driving system and driving method. The active organic light emitting array driving system at least comprises a driving unit, a reference signal supplying unit, a sampling unit, a modulation parameter determination unit, a modulation unit and a control unit. The driving unit is connected with a plurality of light-emitting diodes to form an active organic light emitting array, the reference signal supplying unit is used for supplying different reference signals to the driving unit repeatedly, the sampling unit is used for collecting the correlated electric signals of the light-emitting diodes on the basis of the position correlated information of the light-emitting diodes, the modulation parameter determination unit is used for confirming the modulation parameters of the light emitting units on the basis of the multiple sampling results, the modulation unit is used for modulating the electric signals related to the image data of the light emitting units on the basis of the modulation parameters and the modulation rules of the light emitting units, and the control unit is used for transmitting the reference signals or the modulated signals to the driving unit. The active organic light emitting array driving system and driving method can restrain the inconsistency caused by the fact that the threshold voltage of a driving tube is not matched with parameters such as carrier mobility and the inconsistency caused by supply voltage IR-drop.

Description

Active organic light-emitting array drive system and driving method

Technical field

The present invention relates to active organic light-emitting diode field, particularly relate to a kind of active organic light-emitting array drive system and driving method.

Background technology

Active organic light-emitting diode (AMOLED) display technique has relative to the advantage of active-matrix liquid crystal display (AMLCD) display technique: low-power consumption (not needing backlight), wide viewing angle, high brightness and response are fast, thus AMOLED display technique obtains and develops rapidly, and the share of occupying in display field is also increasing gradually.

The most frequently used AMOLED pixel-driving circuit as shown in Figure 1.During data write, signal SEL1 is high level, and switch transistor T 11 is closed, and view data V1data is directly loaded on the grid of driving transistors DTFT1, and this information of voltage is stored in electric capacity C1st; Glow phase, signal SEL1 is low level, and switch transistor T 11 disconnects, and the electric charge be stored on electric capacity C1st makes driving transistors DTFT1 conducting, and electric current flows through light emitting diode OLED1, thus makes it luminous.

The shortcoming of above-mentioned Driving technique is, the driving circuit shown in Fig. 1 is produced on polycrystalline silicon material usually, and therefore switch transistor T 11 and driving transistors DTFT1 are thin film transistor (TFT).Due to the randomness distributed in crystal boundary and the crystal orientation of polycrystalline silicon material, the threshold voltage of thin film transistor (TFT) and carrier mobility present along with the difference of locus and very significantly change, and this can cause the uneven of each OLED luminescence, affects picture quality.Secondly, along with the increase of display service time, it is aging that the OLED of different materials can occur in various degree, causes display brightness to decline; Further, when display array size is larger, supply voltage VDD also has certain pressure drop, and the supply voltage VDD signal thus in each pixel can be different, also can cause the problem of non-uniform light.

The method overcome the above problems generally has two kinds.The first realizes compensating by improving driving circuit, normally on the basis of original 2T1C, increases transistor and electric capacity, utilize the more complicated time sequential routine, realize compensating.Owing to causing the problem of OLED non-uniform light to have many aspects, this compensation way can only compensate one or two aspect mostly, compensates comprehensive not; And because each pixel cell will be equipped with a driving circuit, when driving circuit has more complicated circuit structure and time sequential routine, the area of driving circuit can be very large.

Second method is that the mode fed back by signal sampling realizes compensating, and this compensation way, its driving circuit generally all only needs traditional 2T1C structure, and compensates more comprehensive.As shown in document " A Luminance Adjusting Algorithm for High Resolution and High Image Quality AMOLED Displays of Mobile Phone Application ", adopt the method for light signal sampling feedback, but the method needs a luminance sensor, this device fabrication acquires a certain degree of difficulty, and luminance sensor is easily subject to the impact of surround lighting.

Summary of the invention

The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of active organic light-emitting array drive system, to suppress the threshold voltage due to driving tube, the inconsistency between the pixel cell that the parameters such as carrier mobility are not mated and supply voltage IR-drop etc. causes.

For achieving the above object and other relevant objects, the invention provides a kind of active organic light-emitting array drive system, it at least comprises:

Driver element, is connected to form active organic light-emitting array with multiple light emitting diode, for driving each lumination of light emitting diode based on the signal of access;

Reference signal providing unit, for repeatedly providing different reference signals to driver element;

Sampling unit, for when each light emitting diode comes luminous based on reference signal, the location dependent information based on each light emitting diode gathers the associated electrical signals of each light emitting diode;

Modulation parameter determining unit, for determining the modulation parameter of each luminescence unit based on described sampling unit sampled result repeatedly;

Modulating unit, for modulating, so that driver element drives each luminescence unit luminous based on the signal after each modulation based on the respective modulation parameter of each luminescence unit and the modulating rule electric signal relevant to view data separately to each luminescence unit; And

Control module, for the location dependent information based on each light emitting diode, the signal after the modulation of the reference signal that Reference Signal providing unit exports or modulating unit output sends into driver element.

Preferably, described driver element comprises multiple driving circuit be made up of switching tube, driving tube and energy-storage travelling wave tube.

Preferably, described location dependent information comprises the line number of light emitting diode in active organic light-emitting array and row number.

The present invention also provides a kind of active organic light-emitting array driving method, and it at least comprises:

1) control module is based on the location dependent information of each light emitting diode, and the reference signal that Reference Signal providing unit exports is supplied to driver element, makes each light emitting diode come luminous based on respective reference signal;

2), after sampling unit gathers the associated electrical signals of each light emitting diode based on the location dependent information of each light emitting diode, modulation parameter determining unit is exported to;

3) step 1 is repeated at least one times) and 2);

4) described modulation parameter determining unit determines the modulation parameter of each luminescence unit based on the associated electrical signals of each light emitting diode repeatedly;

5) modulating unit is modulated based on the respective modulation parameter of each luminescence unit and the modulating rule electric signal relevant to view data separately to each luminescence unit, to obtain each luminescence unit modulation signal separately;

6) control module is based on the location dependent information of each light emitting diode, and each luminescence unit modulation signal is separately supplied to driver element, makes each light emitting diode come luminous based on respective modulation signal.

Preferably, when described associated electrical signals is the current signal of light emitting diode and modulation parameter is $\left\{\begin{array}{c}X=\frac{V_{\mathrm{ref}2}-V_{\mathrm{ref}1}}{\sqrt{I_{d1}}-\sqrt{I_{d2}}}\\ Y=\frac{V_{\mathrm{ref}2}\sqrt{I_{d1}}-V_{\mathrm{ref}1}\sqrt{I_{d2}}}{\sqrt{I_{d1}}-\sqrt{I_{d2}}}\end{array}\right.$ Time, described modulating rule is adopt the following formula couple electric signal V relevant to view data _incarry out modulation to obtain modulation signal V _mod:

wherein, p ₁, α ₁, and β ₁for predetermined constant, I _d2for reference voltage is V _ref2the current signal gathered, I _d1for reference voltage is V _ref1the current signal gathered.

Preferably, when described associated electrical signals is the voltage signal of light emitting diode and modulation parameter is $\left\{\begin{array}{c}{X}^{\′}=\frac{V_{\mathrm{ref}2}-V_{\mathrm{ref}1}}{\sqrt{V_{\mathrm{oled}1}}-\sqrt{V_{\mathrm{oled}2}}}\\ Y^{\′}=\frac{V_{\mathrm{ref}2}\sqrt{V_{\mathrm{oled}1}}-V_{\mathrm{ref}1}\sqrt{V_{\mathrm{oled}2}}}{\sqrt{V_{\mathrm{oled}1}}-\sqrt{V_{\mathrm{oled}2}}}\end{array}\right.$ Time, described modulating rule is adopt the following formula couple electric signal V relevant to view data _incarry out modulation to obtain modulation signal V _mod': wherein, p ₂, α ₂, and β ₂for predetermined constant, c is the coefficient relevant with voltage to the electric current of light emitting diode, V _oled2for reference voltage is V _ref2the voltage signal gathered, V _oled1for reference voltage is V _ref1the voltage signal gathered.

As mentioned above, active organic light-emitting array drive system of the present invention and driving method, there is following beneficial effect: effectively can suppress the threshold voltage due to driving tube, the inconsistency between the pixel cell that the parameters such as carrier mobility are not mated and supply voltage IR-drop etc. causes.

Accompanying drawing explanation

Fig. 1 is shown as active organic light-emitting diode driving circuit schematic diagram of the prior art.

Fig. 2 is shown as active organic light-emitting array drive system schematic diagram of the present invention.

Fig. 3 is shown as a kind of preferred circuit figure of the driver element of active organic light-emitting array drive system of the present invention.

Element numbers explanation

1 active organic light-emitting array drive system

11 driver elements

111 driving circuits

12 reference signal providing unit

13 sampling units

14 modulation parameter determining units

15 modulating units

16 control modules

Embodiment

Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.

Refer to Fig. 2 to Fig. 3.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.

As shown in Figure 2, the invention provides a kind of active organic light-emitting array drive system.This active organic light-emitting array drive system 1 at least comprises: driver element 11, reference signal providing unit 12, sampling unit 13, modulation parameter determining unit 14, modulating unit 15 and control module 16.

Described driver element 11 is connected to form active organic light-emitting array with multiple light emitting diode, for driving each lumination of light emitting diode based on the signal of access.

As shown in Figure 3, this driver element 11 comprises multiple driving circuit 111 to a kind of preferred driver element, and every one drive circuit 111 drives a light emitting diode.Wherein, every one drive circuit 111 is made up of the first switch transistor T 1, driving tube DTFT and energy-storage travelling wave tube Cst, and the connected mode of each components and parts as shown in Figure 3, is no longer described in detail at this.

It should be noted that, it should be appreciated by those skilled in the art that above-mentioned shown circuit only just lists, but not limitation of the present invention, in fact, anyly the driver element of active organic light-emitting array can be connected to form with multiple light emitting diode, all within the scope of the present invention.

Described reference signal providing unit 12 is for repeatedly providing different reference signals to driver element 11, so that driver element 11 drives each lumination of light emitting diode based on reference signal.

Preferably, described reference signal providing unit 12 can adopt reference voltage generator to realize.

Described sampling unit 13 is for when each light emitting diode comes luminous based on reference signal, and the location dependent information based on each light emitting diode gathers the associated electrical signals of each light emitting diode, and the connection of itself and each light emitting diode as shown in Figure 3.

Wherein, described associated electrical signals comprises any electric signal relevant to light emitting diode, preferably, includes but not limited to: the current signal of light emitting diode, the voltage signal etc. of light emitting diode.

Wherein, described location dependent information comprises any information relevant to the position of light emitting diode in active organic light-emitting array, preferably, includes but not limited to: the line number of light emitting diode in active organic light-emitting array and row number, address information etc.

Such as, when each light emitting diode comes luminous based on reference voltage, described sampling unit 13 gathers the current signal of each light emitting diode line by line, forms current signal matrix thus.

Preferably, described sampling unit 13 can adopt current sampler or voltage sample device to realize.

Described modulation parameter determining unit 14 is for determining the modulation parameter of each luminescence unit based on the sampled result of described sampling unit more than 13 time.

Particularly, as the reference voltage V that a certain light emitting diode provides based on reference signal providing unit 12 _ref1when coming luminous, the sample associated electrical signals of this light emitting diode of described sampling unit 13 be current signal is I _d1; As the reference voltage V that this light emitting diode OLED provides based on reference signal providing unit 12 _ref2when coming luminous, the sample current signal of this light emitting diode OLED of described sampling unit 13 is I _d2, then described modulation parameter determining unit 14 is preferably based on following formula to determine modulation parameter X and the Y of this light emitting diode:

$\left\{\begin{array}{c}X=\frac{V_{\mathrm{ref}2}-V_{\mathrm{ref}1}}{\sqrt{I_{d1}}-\sqrt{I_{d2}}}\\ Y=\frac{V_{\mathrm{ref}2}\sqrt{I_{d1}}-V_{\mathrm{ref}1}\sqrt{I_{d2}}}{\sqrt{I_{d1}}-\sqrt{I_{d2}}}\end{array}\right.---\left(1\right)$

Because: for light emitting diode, when respectively based on reference voltage V _ref1, V _ref2when coming luminous, flow through the electric current I of light emitting diode _d1, I _d2be respectively:

$\left\{\begin{array}{c}{I}_{d1}=\frac{k}{2}{(V_{\mathrm{DD}}-V_{\mathrm{ref}1}-V_{\mathrm{th}})}^2\\ I_{d2}=\frac{k}{2}{(V_{\mathrm{DD}}-V_{\mathrm{ref}2}-V_{\mathrm{th}})}^2\end{array}\right.---\left(2\right)$

Wherein, V _thfor the threshold voltage of the driving tube DTFT that light emitting diode connects, k is the parameter relevant to the channel dimensions of this driving tube DTFT etc., if setting:

$\left\{\begin{array}{c}X=\sqrt{\frac{2}{k}}\\ Y=V_{\mathrm{DD}}-V_{\mathrm{th}}\end{array}\right.---\left(3\right)$

The then current-voltage correlation formula of light emitting diode, namely above formula (2) is converted to:

$\left\{\begin{array}{c}{I}_{d1}=\frac{1}{X^2}{(Y-V_{\mathrm{ref}1})}^2\\ I_{d2}=\frac{1}{X^2}{(Y-V_{\mathrm{ref}2})}^2\end{array}\right.---\left(4\right)$

Formula (4) is solved, obtains modulation parameter X and Y, namely as shown in previously described formula (1).

If the reference voltage V that light emitting diode provides based on reference signal providing unit 12 _ref1when coming luminous, the sample associated electrical signals of this light emitting diode of described sampling unit 13 be voltage signal is V _oled1; As the reference voltage V that this light emitting diode provides based on reference signal providing unit 12 _ref2when coming luminous, the sample voltage signal of this light emitting diode of described sampling unit 13 is V _oled2, then described modulation parameter determining unit 14 is preferably based on following formula to determine modulation parameter X' and the Y' of this light emitting diode OLED:

$\left\{\begin{array}{c}{X}^{\′}=\frac{V_{\mathrm{ref}2}-V_{\mathrm{ref}1}}{\sqrt{V_{\mathrm{oled}1}}-\sqrt{V_{\mathrm{oled}2}}}\\ Y^{\′}=\frac{V_{\mathrm{ref}2}\sqrt{V_{\mathrm{oled}1}}-V_{\mathrm{ref}1}\sqrt{V_{\mathrm{oled}2}}}{\sqrt{V_{\mathrm{oled}1}}-\sqrt{V_{\mathrm{oled}2}}}\end{array}\right.---\left(5\right)$

Because light emitting diode is when normal luminous works, and its voltage-current characteristic belongs to linear relationship substantially, and the electric current flowing through light emitting diode is equal with the electric current flowing through respective drive pipe DTFT, then:

$\left\{\begin{array}{c}{V}_{\mathrm{oled}1}={\mathrm{cI}}_{\mathrm{oled}1}={\mathrm{cI}}_{d1}\\ V_{\mathrm{oled}2}={\mathrm{cI}}_{\mathrm{oled}2}={\mathrm{cI}}_{d2}\end{array}\right.---\left(6\right)$

Wherein, V _oled1, V _oled2, I _oled1, I _oled2be respectively voltage and the electric current of driving tube DTFT, reference voltage V _ref1, V _ref2, I _d1, I _d2for flowing through the electric current of light emitting diode, c is constant.And, for light emitting diode, when respectively based on reference voltage V _ref1, V _ref2when coming luminous, flow through the electric current I of light emitting diode _d1, I _d2as front formula (2), be namely respectively:

$\left\{\begin{array}{c}{I}_{d1}=\frac{k}{2}{(V_{\mathrm{DD}}-V_{\mathrm{ref}1}-V_{\mathrm{th}})}^2\\ I_{d2}=\frac{k}{2}{(V_{\mathrm{DD}}-V_{\mathrm{ref}2}-V_{\mathrm{th}})}^2\end{array}\right.---\left(7\right)$

If setting:

$\left\{\begin{array}{c}{X}^{\′}=\sqrt{\frac{2}{k}}\\ Y^{\′}=V_{\mathrm{DD}}-V_{\mathrm{th}}\end{array}\right.---\left(8\right)$

Then based on above formula (6) and (8), above formula (7) is converted to:

$\left\{\begin{array}{c}\frac{V_{\mathrm{oled}1}}{c}=\frac{1}{X^{\′2}}{(Y^{\′}-V_{\mathrm{ref}1})}^2\\ \frac{V_{\mathrm{oled}2}}{c}=\frac{1}{X^{\′2}}{(Y^{\′}-V_{\mathrm{ref}2})}^2\end{array}\right.---\left(9\right)$

Formula (9) is solved, obtains modulation parameter X' and Y', namely as shown in previously described formula (5).

It should be noted that, it should be appreciated by those skilled in the art that above-mentioned shown in only just list, but not limitation of the present invention.

Described modulating unit 15 is for modulating, so that driver element 11 drives each luminescence unit luminous based on the signal after each modulation based on the respective modulation parameter of each luminescence unit and the modulating rule electric signal relevant to view data separately to each luminescence unit.

Particularly, when the described associated electrical signals current signal that is light emitting diode, modulation parameter are such as formula shown in (1), namely $\left\{\begin{array}{c}X=\frac{V_{\mathrm{ref}2}-V_{\mathrm{ref}1}}{\sqrt{I_{d1}}-\sqrt{I_{d2}}}\\ Y=\frac{V_{\mathrm{ref}2}\sqrt{I_{d1}}-V_{\mathrm{ref}1}\sqrt{I_{d2}}}{\sqrt{I_{d1}}-\sqrt{I_{d2}}}\end{array}\right.,$ A kind of preferred modulating rule is: adopt the following formula couple electric signal V relevant to view data _incarry out modulation to obtain modulation signal V _mod:

$V_{\mathrm{mod}}=Y-{{\mathrm{Xp}}_1}^{{\mathrm{\α}}_1}{V_{\mathrm{in}}}^{{\mathrm{\β}}_1}---\left(10\right)$

Wherein, p ₁, α ₁, and β ₁for predetermined constant, I _d2for reference voltage is V _ref2the current signal gathered, I _d1for reference voltage is V _ref1the current signal gathered.

In addition, if the voltage signal that associated electrical signals is light emitting diode and modulation parameter are such as formula shown in (5), namely $\left\{\begin{array}{c}{X}^{\′}=\frac{V_{\mathrm{ref}2}-V_{\mathrm{ref}1}}{\sqrt{V_{\mathrm{oled}1}}-\sqrt{V_{\mathrm{oled}2}}}\\ Y^{\′}=\frac{V_{\mathrm{ref}2}\sqrt{V_{\mathrm{oled}1}}-V_{\mathrm{ref}1}\sqrt{V_{\mathrm{oled}2}}}{\sqrt{V_{\mathrm{oled}1}}-\sqrt{V_{\mathrm{oled}2}}}\end{array}\right.,$ A kind of preferably modulating rule is: adopt the following formula couple electric signal V relevant to view data _incarry out modulation to obtain modulation signal V _mod':

${V_{\mathrm{mod}}}^{\′}=Y^{\′}-X^{\′}\sqrt{c}{p_2}^{{\mathrm{\α}}_2}{V_{\mathrm{in}}}^{{\mathrm{\β}}_2}---\left(11\right)$

Wherein, p ₂, α ₂, and β ₂for predetermined constant, c is the coefficient relevant with voltage to the electric current of light emitting diode, V _oled2for reference voltage is V _ref2the voltage signal gathered, V _oled1for reference voltage is V _ref1the voltage signal gathered.

Described control module 16 is for the location dependent information based on each light emitting diode, and the signal after the modulation of the reference signal that Reference Signal providing unit 12 exports or modulating unit 15 output sends into driver element 11.

Such as, if described control module 16 is based on the line number of each light emitting diode in active organic light-emitting array and row number, by each light emitting diode modulation signal V separately _mod(namely based on each modulation signal that previously described formula (10) obtains) is supplied to driver element 11, then flow to the electric current I of each light emitting diode _dcan calculate in the following manner:

$I_d=\frac{k}{2}{(V_{\mathrm{DD}}-V_{\mathrm{mod}}-V_{\mathrm{th}})}^2---\left(12\right)$

Based on setting and the formula (10) of previously described formula (3), formula (12) is converted to:

$I_d=\frac{k}{2}{(V_{\mathrm{DD}}-V_{\mathrm{mod}}-V_{\mathrm{th}})}^2=\frac{1}{X^2}{[Y-(Y-{{\mathrm{Xp}}_1}^{{\mathrm{\α}}_1}{V_{\mathrm{in}}}^{{\mathrm{\β}}_1})]}^2={p_1}^{2{\mathrm{\α}}_1}{V_{\mathrm{in}}}^{{2\mathrm{\β}}_1}.$

If wherein, I _maxfor the maximum drive current of light emitting diode, V _maxfor the maximum input voltage signal of light emitting diode, then: visible, the electric current flowing through light emitting diode only with view data V _inrelevant, and with view data V _inbecome once linear relationship.

Again such as, control module 16 based on the line number of each light emitting diode in active organic light-emitting array and row number, by each light emitting diode modulation signal V separately _mod' (namely based on each modulation signal that previously described formula (11) obtains) be supplied to driver element 11, then flow to the electric current I of each light emitting diode _d' can calculate in the following manner:

${I_d}^{\′}=\frac{k}{2}{(V_{\mathrm{DD}}-{V_{\mathrm{mod}}}^{\′}-V_{\mathrm{th}})}^2---\left(13\right)$

Based on previously described formula (7), (8) and (11), formula (13) is converted to:

If wherein, I _maxfor the maximum drive current of light emitting diode, V _maxfor the maximum input voltage signal of light emitting diode, then: visible, the electric current flowing through light emitting diode only with view data V _inrelevant, and become once linear relationship.

Below by as follows for the driving process being described in further detail above-mentioned active organic light-emitting array drive system 1:

The first step: control module 16 is based on the location dependent information of each light emitting diode, and the reference signal that Reference Signal providing unit 12 exports is supplied to driver element 11, makes each light emitting diode come luminous based on respective reference signal.

Such as, control module 16 based on the line number of each light emitting diode in active organic light-emitting array and row number, the reference voltage V that Reference Signal providing unit 12 exports _ref1be supplied to each driving circuit 111 in driver element 11 respectively, make each light emitting diode respectively based on reference voltage V _ref1come luminous.

Second step: sampling unit 13 exports modulation parameter determining unit 14 to after gathering the associated electrical signals of each light emitting diode based on the location dependent information of each light emitting diode.

Particularly, sampling unit 13, based on the line number of each light emitting diode in active organic light-emitting array and row number, gathers current signal or the voltage signal of each light emitting diode one by one.

3rd step: with reference voltage V _ref2come the repetition first step and second step.

4th step: described modulation parameter determining unit 14 determines the modulation parameter of each luminescence unit based on the associated electrical signals of each light emitting diode repeatedly.

Such as, described modulation parameter determining unit 14 is based on each light emitting diode current signal I separately _d1, I _d2, determine each light emitting diode modulation parameter X and Y separately (specifically see previously described formula (1)).

Again such as, described modulation parameter determining unit 14 is based on each light emitting diode voltage signal V separately _oled1, V _oled2, determine that each light emitting diode modulation parameter X' and Y'(is separately specifically see previously described formula (5)).

5th step: modulating unit 15 is modulated based on the respective modulation parameter of each luminescence unit and the modulating rule electric signal relevant to view data separately to each luminescence unit, to obtain each luminescence unit modulation signal separately.

Such as, modulating unit 15 based on each luminescence unit modulation parameter X and Y separately, the electric signal V relevant to view data separately to each luminescence unit _incarry out modulation and obtain each luminescence unit modulation signal V separately _mod(specifically see previously described formula (10)).

Again such as, modulating unit 15 based on each luminescence unit modulation parameter X' and Y' separately, the electric signal V relevant to view data separately to each luminescence unit _incarry out modulation and obtain each luminescence unit modulation signal V separately _mod' (specifically see previously described formula (12)).

6th step: each light emitting diode modulation signal separately, based on the location dependent information of each light emitting diode, is supplied to driver element 11 by control module 16, makes each light emitting diode come luminous based on respective modulation signal.

Such as, control module 16 based on the line number of each light emitting diode in active organic light-emitting array and row number, by each light emitting diode modulation signal V separately _modbe supplied to driver element 11, make each light emitting diode based on respective modulation signal V _modcome luminous.

Again such as, control module 16 based on the line number of each light emitting diode in active organic light-emitting array and row number, by each light emitting diode modulation signal V separately _mod' be supplied to driver element 11, make each light emitting diode based on respective modulation signal V _mod' next luminous.

Based on Such analysis, when each luminescence unit comes luminous based on respective modulation signal, the electric current flowing through each light emitting diode is only relevant with input voltage data, with the threshold voltage of driving tube, the parameters such as carrier mobility and supply voltage are all irrelevant, therefore the threshold voltage due to driving tube can just be suppressed completely, the inconsistency between the pixel cell that the parameters such as carrier mobility are not mated and supply voltage IR-drop etc. causes.

In sum, active organic light-emitting array drive system of the present invention and driving method adopt the mode of electric signal sampling feedback to realize compensating, and owing to can adopt the driving circuit of 2T1C structure, therefore driving circuit structure is simple, sequential operation is easy, and area is less, and, the size of OLED drive current is only relevant with input voltage signal, and exponent function relation (the best can be once linear relationship), with the threshold voltage of driving tube, the parameters such as carrier mobility and supply voltage are all irrelevant, therefore, the threshold voltage due to driving tube can be suppressed completely, the parameters such as carrier mobility are not mated and supply voltage IR-drop (when display array size is larger, power lead VDD also has certain pressure drop, thus the VDD signal in each pixel is different) etc. the unevenness of luminosity between the pixel cell that causes.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.

Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.

Claims (8)

1. an active organic light-emitting array drive system, described active organic light-emitting array drive system at least comprises driver element, active organic light-emitting array is connected to form, for driving each lumination of light emitting diode based on the signal of access with multiple light emitting diode; It is characterized in that, described active organic light-emitting array drive system also comprises:

Reference signal providing unit, for repeatedly providing different reference signals to driver element;

Sampling unit, for when each light emitting diode comes luminous based on reference signal, the location dependent information based on each light emitting diode gathers the associated electrical signals of each light emitting diode;

Modulation parameter determining unit, for determining the modulation parameter of each luminescence unit based on described sampling unit sampled result repeatedly;

Modulating unit, for modulating, so that driver element drives each luminescence unit luminous based on the signal after each modulation based on the respective modulation parameter of each luminescence unit and the modulating rule electric signal relevant to view data separately to each luminescence unit;

Control module, for the location dependent information based on each light emitting diode, the signal after the modulation of the reference signal that Reference Signal providing unit exports or modulating unit output sends into driver element.

2. active organic light-emitting array drive system according to claim 1, is characterized in that: when described associated electrical signals be the current signal of light emitting diode, modulation parameter is $\left\{\begin{array}{c}X=\frac{V_{\mathrm{ref}2}-V_{\mathrm{ref}1}}{\sqrt{I_{d1}}-\sqrt{I_{d2}}}\\ Y=\frac{V_{\mathrm{ref}2}\sqrt{I_{d1}}-V_{\mathrm{ref}1}\sqrt{I_{d2}}}{\sqrt{I_{d1}}-\sqrt{I_{d2}}}\end{array}\right.$ Time, described modulating rule is adopt the following formula couple electric signal V relevant to view data _incarry out modulation to obtain modulation signal V _mod: wherein, p ₁, α ₁, and β ₁for predetermined constant, I _d2for reference voltage is V _ref2the current signal gathered, I _d1for reference voltage is V _ref1the current signal gathered.

3. active organic light-emitting array drive system according to claim 1, is characterized in that: when described associated electrical signals is the voltage signal of light emitting diode and modulation parameter is $\left\{\begin{array}{c}{X}^{\′}=\frac{V_{\mathrm{ref}2}-V_{\mathrm{ref}1}}{\sqrt{V_{\mathrm{oled}1}}-\sqrt{V_{\mathrm{oled}2}}}\\ Y^{\′}=\frac{V_{\mathrm{ref}2}\sqrt{V_{\mathrm{oled}1}}-V_{\mathrm{ref}1}\sqrt{V_{\mathrm{oled}2}}}{\sqrt{V_{\mathrm{oled}1}}-\sqrt{V_{\mathrm{oled}2}}}\end{array}\right.$ Time, described modulating rule is adopt the following formula couple electric signal V relevant to view data _incarry out modulation to obtain modulation signal V _mod': wherein, p ₂, α ₂, and β ₂for predetermined constant, c is the coefficient relevant with voltage to the electric current of light emitting diode, V _oled2for reference voltage is V _ref2the voltage signal gathered, V _oled1for reference voltage is V _ref1the voltage signal gathered.

4. active organic light-emitting array drive system according to claim 1, is characterized in that: described driver element comprises multiple driving circuit be made up of switching tube, driving tube and energy-storage travelling wave tube.

5. active organic light-emitting array drive system according to claim 1, is characterized in that: described location dependent information comprises the line number of light emitting diode in active organic light-emitting array and row number.

6. an active organic light-emitting array driving method, is characterized in that, described active organic light-emitting array driving method at least comprises:

1) control module is based on the location dependent information of each light emitting diode, and the reference signal that Reference Signal providing unit exports is supplied to driver element, makes each light emitting diode come luminous based on respective reference signal;

2), after sampling unit gathers the associated electrical signals of each light emitting diode based on the location dependent information of each light emitting diode, modulation parameter determining unit is exported to;

3) step 1 is repeated at least one times) and 2);

4) described modulation parameter determining unit determines the modulation parameter of each luminescence unit based on the associated electrical signals of each light emitting diode repeatedly;

5) modulating unit is modulated based on the respective modulation parameter of each luminescence unit and the modulating rule electric signal relevant to view data separately to each luminescence unit, to obtain each luminescence unit modulation signal separately;

6) control module is based on the location dependent information of each light emitting diode, and each light emitting diode modulation signal is separately supplied to driver element, makes each light emitting diode come luminous based on respective modulation signal.

7. active organic light-emitting array driving method according to claim 6, is characterized in that: when described associated electrical signals is the current signal of light emitting diode and modulation parameter is $\left\{\begin{array}{c}X=\frac{V_{\mathrm{ref}2}-V_{\mathrm{ref}1}}{\sqrt{I_{d1}}-\sqrt{I_{d2}}}\\ Y=\frac{V_{\mathrm{ref}2}\sqrt{I_{d1}}-V_{\mathrm{ref}1}\sqrt{I_{d2}}}{\sqrt{I_{d1}}-\sqrt{I_{d2}}}\end{array}\right.$ Time, described modulating rule is adopt the following formula couple electric signal V relevant to view data _incarry out modulation to obtain modulation signal V _mod: wherein, p ₁, α ₁, and β ₁for predetermined constant, I _d2for reference voltage is V _ref2the current signal gathered, I _d1for reference voltage is V _ref1the current signal gathered.

8. active organic light-emitting array driving method according to claim 6, is characterized in that: when described associated electrical signals is the voltage signal of light emitting diode and modulation parameter is $\left\{\begin{array}{c}{X}^{\′}=\frac{V_{\mathrm{ref}2}-V_{\mathrm{ref}1}}{\sqrt{V_{\mathrm{oled}1}}-\sqrt{V_{\mathrm{oled}2}}}\\ Y^{\′}=\frac{V_{\mathrm{ref}2}\sqrt{V_{\mathrm{oled}1}}-V_{\mathrm{ref}1}\sqrt{V_{\mathrm{oled}2}}}{\sqrt{V_{\mathrm{oled}1}}-\sqrt{V_{\mathrm{oled}2}}}\end{array}\right.$ Time, described modulating rule is adopt the following formula couple electric signal V relevant to view data _incarry out modulation to obtain modulation signal V _mod': wherein, p ₂, α ₂, and β ₂for predetermined constant, c is the coefficient relevant with voltage to the electric current of light emitting diode, V _oled2for reference voltage is V _ref2the voltage signal gathered, V _oled1for reference voltage is V _ref1the voltage signal gathered.