CN1703731B - Panel display driving device and driving method - Google Patents

Panel display driving device and driving method Download PDF

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Publication number
CN1703731B
CN1703731B CN02828406.2A CN02828406A CN1703731B CN 1703731 B CN1703731 B CN 1703731B CN 02828406 A CN02828406 A CN 02828406A CN 1703731 B CN1703731 B CN 1703731B
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China
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light
current value
current
value
emitting component
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CN1703731A (en
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石塚真一
土田正美
越智英夫
坂本强
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Pioneer Corp
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Pioneer Corp
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Priority claimed from JP2001401815A external-priority patent/JP2003202837A/en
Priority claimed from JP2002201697A external-priority patent/JP4302945B2/en
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Priority claimed from PCT/JP2002/013374 external-priority patent/WO2003058594A1/en
Publication of CN1703731A publication Critical patent/CN1703731A/en
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Abstract

A display panel driving device and driving method for providing high quality images without irregular luminance even after long-time use. The value of the light-emission drive current flowing when causing each light-emission elements bearing each pixel to independently emit light in succession is measured, then the luminance is corrected for each input pixel data based on the above light-emission drive current values, associated with the pixels corresponding to the input pixel data. According to another aspect, the voltage value of the drive voltage is adjusted in such a manner that one value among each measured light-emission drive current value becomes equal to a predetermined reference current value. According to a further aspect, the current value is measured while an off-set current component corresponding to a leak current of the display panel is added to the current outputted from the drive voltage generator circuit and the resultant current is supplied to each of the pixel portions.

Description

Panel display driving device and driving method
Technical field
The present invention relates to active array type display panel drive spare and driving method thereof.
Background technology
In recent years, the electroluminescence display device that the organic electroluminescent device (below be called the EL display element) that contains pixel with use combines as the display board of light-emitting component (below be called the EL display device) has received great concern.Use the driving method of the FPD of these EL display devices well known in the prior art to comprise that simple matrix drives and driven with active matrix.The advantage of the EL display device of driven with active matrix is than passive matrix consumption power still less, and crosstalking between pixel is littler, is particularly suitable for giant-screen and high resolving power and shows.
Fig. 1 shows the basic structure of active matrix drive-type EL display device.
As shown in Figure 1, the EL display device comprises display board 10 and drives the driving element 100 of this display board 10 according to picture signal.
Display board 10 by B-power line 16, cathode power line 17, on a screen, constitute the sweep trace A of n bar horizontal scanning line 1To A n(scan electrode), and and A 1To A nM bar data line (data electrode) B of every sweep trace cross arrangement 1To B mConstitute.And driving voltage Vc is added on the B-power line 16, and ground potential GND is added on the cathode power line 17.In addition, the sweep trace A in above-mentioned display board 10 1To A nWith data line B 1To B mEach point of crossing form EL unit E with pixel 1,1To E N, m
Fig. 2 shows the inner structure at the embodiment of the EL unit E of the infall formation of a sweep trace A and a data line B.
In Fig. 2, the grid G of selected FET (field effect transistor) 11 is connected to sweep trace A, and drain D is connected to data line B.The grid G that is used for the transistor FET12 of light emitting drive is connected to the source S of FET11.Driving voltage Vc is added to FET12 through B-power line 16, and capacitor 13 is connected between grid G and the source S.In addition, the anode tap of EL element 15 is connected to the drain D of FET12.Ground potential GND is added to the cathode terminal of EL element 15 through cathode power line 17.
Driving element 100 is successively to every sweep trace A of display board 10 1To A nOptionally apply scanning impulse.And driving element 100 is according to the received image signal corresponding to every horizontal scanning line, with added above-mentioned scanning impulse sequential synchronized generation pixel data pulses DP 1To DP m, and they are added to data line B respectively 1To B mEach pixel data pulses DP has the pulse voltage according to the gray scale of being represented by received image signal.Each the EL unit that is connected to the sweep trace A that is added with scanning impulse becomes the target that pixel data writes.FET11 in the EL unit of the target that writes as pixel data E responds above-mentioned scanning impulse and is in conducting state, and will be added to respectively through the above-mentioned pixel data pulses DP that data line B provides on the grid G and capacitor 13 of FET12.FET12 produces light emission drive current according to the pulse voltage of pixel data pulses DP, and it is added to EL element 15.EL element 15 sends the light of being confirmed brightness by the pulse voltage of above-mentioned pixel data pulses DP according to light emission drive current.Simultaneously, capacitor 13 is according to the pulse voltage charging of above-mentioned pixel data pulses DP.Through this charging modes, keep pulse voltage, thereby realize that so-called pixel data writes according to the gray scale of representing by received image signal.When discharging the target that pixel data writes, FET11 is in off state, and stopping to provide pixel data pulses DP to the grid G of FET12.But, during this period, because the voltage that is kept by capacitor 13 as stated continues to be added to the grid G of FET12, so the FET12 maintenance sends above-mentioned light emission drive current to EL element 15.
One of characteristic of EL element 15 is that the resistance value of element itself increases gradually after prolonging fluorescent lifetime.Because at the EL unit E that supports by display board 10 1,1To E N, mIn, be different in response to the glow frequency of the received image signal of each EL element 15, so difference appears in the accumulation fluorescent lifetime.Therefore, when the driving time overtime of display board 10, the resistance of EL element becomes inhomogeneous, causes the variation of luminosity, causes irregular brightness and screen burning problems such as (screen burning) on the screen for example.
Invention is introduced
An object of the present invention is to can be used for time expand and can show equably that the display panel drive spare of high quality graphic and driving method thereof address the above problem through providing a kind of.
And, because according to the glow frequency of received image signal for above-mentioned EL unit E 1,1To E N, mIn each EL element 15 be different, so the accumulation fluorescent lifetime difference appears.Therefore, when the driving time overtime of display board 10, the resistance of EL element becomes inhomogeneous, causes the variation of luminosity, causes the problem such as irregular brightness and screen burning on the screen for example.
Also through providing a kind of display panel drive spare and driving method thereof to address the above problem, this display panel drive spare can forever keep the gray scale of screen in given range in the present invention, thereby it is irregular to prevent to occur brightness in the screen.
According to the display panel drive spare of first aspect present invention is the display panel drive spare that is used to drive the display board that the light-emitting component of a plurality of support pixels that matrix form arranges forms, and above-mentioned display panel drive spare comprises:
Drive voltage generating circuit is that each of a plurality of light-emitting components provides driving voltage through power lead;
The current measurement parts; Be used for make each light-emitting component with the timing of the fluorescent lifetime of each light-emitting component the independent successively current value that obtains in said power, flowing through in luminous; Thereby obtain current value, and it is stored in the storer as the measurement current value of distributing to each pixel corresponding to each pixel;
The brightness correction parts; Be used for according to the above-mentioned measurement current value that is stored in the storer according to a pixel of pixel data; Through revising the gray scale of representing by corresponding to the pixel data of each pixel of received image signal, obtain the pixel data of brightness correction; And
The light emitting drive parts are used for making above-mentioned light-emitting component only during showing light period corresponding to the image in each frame period of above-mentioned received image signal, corresponding to the cycle of the pixel data of brightness correction luminous.
And, be the display panel driving method that is used to drive the display board that a plurality of light-emitting components that comprise pixel that matrix form arranges form according to the display panel driving method of first aspect present invention, display panel driving method may further comprise the steps:
The current measurement step, be used for make each light-emitting component with the timing of the fluorescent lifetime of each light-emitting component the independent successively current value that obtains in said power, flowing through in luminous, thereby obtain current value corresponding to each pixel;
The brightness correction step; Be used for through being stored in the mode in the above-mentioned storer according to the above-mentioned measurement current value of a pixel of above-mentioned pixel data; Through revising the gray scale of representing by corresponding to the pixel data of each pixel of received image signal, obtain the pixel data of brightness correction; And
The light emitting drive step is used for making above-mentioned light-emitting component only showing that corresponding to the image in each frame period of above-mentioned received image signal the cycle of the above-mentioned brightness correction pixel data in the light period is luminous.
According to the display panel drive spare of second aspect present invention is the display panel drive spare that is used for driving according to received image signal the display board that a plurality of light-emitting components that comprise pixel that matrix form arranges form, and above-mentioned display panel drive spare comprises:
Drive voltage generating circuit is that each of a plurality of light-emitting components provides driving voltage through power lead;
The current measurement parts; Be used for through at the current value that makes each light-emitting component obtain in said power, flowing through when luminous with the timing independence successively of the fluorescent lifetime of each light-emitting component; Thereby obtain current value, and it is stored in the storer as the measurement current value of distributing to each pixel corresponding to each pixel; And
Driving voltage is regulated parts, is used for measuring the magnitude of voltage that mode that in the light emission drive current value one equals the predetermined reference current value is regulated above-mentioned driving voltage with each.
According to the display panel drive spare of third aspect present invention is the display panel drive spare that is used for driving according to received image signal the display board that a plurality of light-emitting components that comprise pixel that matrix form arranges form, and above-mentioned display panel driver comprises:
Drive voltage generating circuit is that each of a plurality of light-emitting components provides driving voltage through power lead;
The current measurement parts; Be used for make each light-emitting component with the timing of the fluorescent lifetime of each light-emitting component the independent successively current value that obtains in said power, flowing through in luminous; Thereby obtain current value, and it is stored in the storer as the measurement current value of distributing to each pixel corresponding to each pixel;
Driving voltage is regulated parts, is used for measuring the magnitude of voltage that mode that in the light emission drive current value one equals the predetermined reference current value is regulated above-mentioned driving voltage with each;
The brightness correction parts; Be used for through being stored in the above-mentioned measurement current value in the above-mentioned storer according to a pixel of above-mentioned pixel data; Through revising the gray scale of representing by corresponding to the pixel data of each pixel of above-mentioned received image signal, obtain the pixel data of brightness correction; And
The light emitting drive parts are used for making above-mentioned light-emitting component only during showing light period corresponding to the image in each frame period of above-mentioned received image signal, corresponding to the cycle of the pixel data of brightness correction luminous.
And; According to the display panel driving method of second aspect present invention is the display panel driving method that is used for driving according to received image signal the display board that a plurality of light-emitting components that comprise pixel that matrix form arranges form, and above-mentioned display panel driving method may further comprise the steps:
The current measurement step, be used for make each light-emitting component with the timing of the fluorescent lifetime of each light-emitting component the independent successively current value that obtains in said power, flowing through in luminous, thereby obtain current value corresponding to each pixel; And
The driving voltage regulating step is used for measuring the magnitude of voltage that mode that in the light emission drive current value one equals the predetermined reference current value is regulated above-mentioned driving voltage with each.
And; According to the display panel driving method of third aspect present invention is the display panel driving method that is used for driving according to received image signal the display board that a plurality of light-emitting components that comprise pixel that matrix form arranges form, and above-mentioned display panel driving method may further comprise the steps:
Make each light-emitting component with the timing of the fluorescent lifetime of each light-emitting component the independent successively current value that obtains in said power, flowing through in luminous, thereby obtain current value corresponding to each pixel;
Through being stored in the above-mentioned measurement current value in the above-mentioned storer,, obtain the pixel data of brightness correction through revising the gray scale of representing by corresponding to the pixel data of each pixel of received image signal according to an above-mentioned pixel of above-mentioned pixel data; And
Make above-mentioned light-emitting component only during showing light period corresponding to the image in each frame period of above-mentioned received image signal, corresponding to the cycle of the pixel data of brightness correction luminous.
Display panel driver according to fourth aspect present invention is to have a plurality of drive units that are arranged in the display board of pixel portion wherein; Each pixel portion comprises the series circuit of light-emitting component and on-off element; Drive unit is used for driving display board according to received image signal, comprising: the driving voltage generator that each series circuit of said a plurality of pixel portion is applied driving voltage; Measurement is added to each the current measurement parts of current value of series circuit of said a plurality of pixel portion from said driving voltage generator; In the said electric current that said driving voltage generator provides, add drift current component, and the electric current supply part of resultant current is provided for each series circuit of said a plurality of pixel portion corresponding to the leakage current of said display board; Each said on-off element through said a plurality of pixel portion of conducting respectively; Independent when luminous at each the said light-emitting component that makes said a plurality of pixel portion successively, the memory control unit of the measurement current value that storage is recorded in each the luminous timing corresponding to said a plurality of pixel portion by said current measurement parts in storer; And according to each the brightness correction device of luminosity of luminescent device output of revising said a plurality of pixel portion corresponding to one in the measurement current value that is stored in the said storer.
According to the driving method of fourth aspect present invention is the display panel driving method that is used to have the display board of a plurality of pixel portion of arranging with matrix form; Each pixel portion comprises the series circuit of light-emitting component and on-off element; Driving method is used for driving display board according to received image signal, comprising: the outputting drive voltage that each series circuit of said a plurality of pixel portion is applied the driving voltage generator; To in the said electric current that said driving voltage generator provides, add added value that the drift current component corresponding to the leakage current of said display board obtains and be added to each series circuit of said a plurality of pixel portion; Measurement is added to each the current value of series circuit of said a plurality of pixel portion from said driving voltage generator; Each said on-off element through said a plurality of pixel portion of conducting respectively; Independent when luminous at each the said light-emitting component that makes said a plurality of pixel portion successively, in storer, be stored in each the luminous timing corresponding to said a plurality of pixel portion the output current value from said driving voltage generator is recorded the measurement current value that obtains; And according to each the luminosity of luminescent device output of revising said a plurality of pixel portion corresponding to one in the measurement current value that is stored in the said storer.
The accompanying drawing summary
Fig. 1 shows the synoptic diagram of the composition of active matrix drive-type EL display device;
Fig. 2 shows the exemplary plot of the inner structure of the EL unit E that comprises pixel;
Fig. 3 shows the structural representation according to active matrix drive-type EL display device of the present invention;
Fig. 4 shows the synoptic diagram of embodiment of the inner structure of current detection circuit 2;
Fig. 5 shows the embodiment of light emitting drive form, wherein drives to comprise a frame light period is divided into three sub-frame SF1 to SF3;
Fig. 6 is a process flow diagram of introducing the light emission drive current process of measurement of being carried out by Drive and Control Circuit 4;
Fig. 7 is a process flow diagram of introducing the brightness correction value generating routine of being carried out by Drive and Control Circuit 4;
Fig. 8 shows the figure of light emitting drive form, wherein at a frame light emission drive current HT measuring period is provided in the display cycle;
Fig. 9 shows the synoptic diagram of the embodiment of the current detection circuit 2 with special drive voltage generating circuit that provides for every kind of color;
Figure 10 shows the synoptic diagram of the embodiment of the current detection circuit 2 with special drive voltage generating circuit that provides for each screen area in the display board 10;
Figure 11 shows the structural representation according to another active matrix drive-type EL display device of the present invention;
Figure 12 shows the synoptic diagram of embodiment of the inner structure of current detection circuit 2;
Figure 13 has introduced the process flow diagram of the driving voltage setting program of being carried out by Drive and Control Circuit 4;
Figure 14 shows to have and is used to obtain reference current value I REFThe embodiment of display board 10 of EL unit EX;
Figure 15 shows the structural drawing of the display device that embodies the application;
Figure 16 shows current detection circuit and the structural drawing of current providing circuit in device shown in Figure 15;
Figure 17 shows the process flow diagram of leakage current offset program;
Figure 18 shows leakage current offset procedural example figure;
Figure 19 shows another example of the structure of current detection circuit and current providing circuit in device shown in Figure 15;
Figure 20 shows another example of the structure of current detection circuit and current providing circuit in device shown in Figure 15;
Figure 21 shows the process flow diagram of light emission drive current process of measurement;
Figure 22 shows the process flow diagram of brightness correction value generating routine; And
Figure 23 shows the process flow diagram of driving voltage setting program.
Invention is introduced in detail
Introduce the preferred embodiments of the present invention in detail with reference to accompanying drawing.
Fig. 3 shows the structural representation (hereinafter being called the EL display device) according to electroluminescence active matrix drive-type EL display device of the present invention.
As shown in Figure 3, this EL display device comprises drive voltage generating circuit 1, current detection circuit 2, multiplier 3, Drive and Control Circuit 4, scan line driver 5, datawire driver 6, operating unit 7, light emission drive current storer 8, not glow current value register 9A, reference current value register 9B and display board 10.
Display board 10 by B-power line 16, cathode power line 17, have n bar horizontal scanning line A 1To A nWith m bar data line B 1To B m1 screen of arrangement intersected with each other constitutes.And driving voltage Vc is added on the B-power line 16, and ground potential GND is added on the cathode power line 17.In addition, the sweep trace A in above-mentioned display board 10 1To A nWith data line B 1To B mEach point of crossing form EL unit E with pixel 1,1To E N, mThat is introduced among the inner structure of EL unit E and Fig. 2 is identical, so no longer explanation here.
Drive voltage generating circuit 1 produces above-mentioned DC driving voltage Vc, and is added on the B-power line 16 of display board 10 through current detection circuit 2.
Current detection circuit 2 detects the electric current that in B-power line 16, flows through, and will represent that the current value data-signal CD of detected current value offers Drive and Control Circuit 4.For example, as shown in Figure 4, current detection circuit 2 comprises resistance R 1, measuring switch SW and the A/D converter AD between the B-power line 16 that is connected drive voltage generating circuit 1 and display board 10.When the current detecting enable signal CE that provides when Drive and Control Circuit 4 was logic level 1, measuring switch SW kept breaking off, when the current detecting enable signal CE that is provided is logic level 0, and the switch SW conducting, thus make two terminal shortcircuits of resistance R 1.That is, when measuring switch SW broke off, current detection circuit 2 was in detection mode, and, will offer A/D converter AD according to the voltage that current value produces at the two ends of resistance R 1.Then, A/D converter AD will be that the result that digital value obtains offers Drive and Control Circuit 4 through the voltage transitions that produces resistance R 1 two ends, as current value data-signal CD.
Then, be followed successively by multiplier 3 the pixel data PD according to each pixel of picture signal is provided, this picture intelligence has carried will be presented at the image on the display board 10.Pixel data PD has described the display brightness levels of each pixel.The pixel data PD of each pixel that multiplier 3 will provide multiply by the brightness correction value K that is provided by Drive and Control Circuit 4, obtains the pixel data LD of brightness correction, then it is offered Drive and Control Circuit 4.That is, each input successively comprises the EL unit E of the pixel of display board 10 1,1To E N, mEach pixel data PD the time, the measurement current value of each pixel of measuring before Drive and Control Circuit 4 is read in from light emission drive current value storer 8, and measure current values according to these and produce brightness correction value K, and offer multiplier 3.Below introduce in detail the current value of measuring each pixel and the operation that produces the brightness correction value.
Operating unit 7 receives user's action, and for Drive and Control Circuit 4 corresponding command signal is provided.For example, operating unit 7 provides power on signal ON according to the operational order that powers on that the user sends to Drive and Control Circuit 4, so that the display operation of initialization display board 10.Equally, operating unit 7 provides power-off signal OFF according to the power operation order that the user sends to Drive and Control Circuit 4, so that stop the display operation of display board 10.And operating unit 7 provides brightness correction control signal LAD according to the brightness correction instruction that the user sends to Drive and Control Circuit 4.
According to above-mentioned power on signal ON, Drive and Control Circuit 4 produces above-mentioned brightness correction value K (as described below), and should show that according to the pixel data LD control of above-mentioned brightness correction the classification of the display board 10 of shadow tone (half-tone) brightness drives.Classification in display board 10 drives can realize that we will introduce the embodiment that utilizes the subframe method with the stage division of any kind here.
In the subframe method, a frame display cycle is subdivided into the N sub-frame, and wherein different light periods is distributed to different subframes.According to the gray scale of representing by pixel data, and through determining the subframe combination to realize that luminous mode is with (2 N+ 1) step is realized intermediate luminance.Through the mode of this subframe method, Drive and Control Circuit 4 provides the various drive control signal that drive display board 10 for scan line driver 5 and datawire driver 6.
The operation of scan line driver 5 and datawire driver 6 is described with the mode of embodiment below, and one of them frame display cycle is divided into three sub-frame SF1 to SF3, and is as shown in Figure 5.
At three sub-frame SF1 shown in Figure 5 during each subframe of SF3, every sweep trace A of 5 pairs of display boards 10 of scan line driver 1To A nOptionally apply scanning impulse.Simultaneously, datawire driver 6 and above-mentioned scanning impulse applies sequential synchronously to every data line B 1To B mApply pixel data pulses DP corresponding to each of the pixel data LD of m the brightness correction of each in the pixel of the m in every sweep trace 1To DP mE is under situation luminous during the subframe in the EL unit, and pixel data pulses DP has high voltage pulse, is low voltage pulse (for example, 0 volt) under non-luminous situation.Now, EL unit E is connected to the sweep trace A that applies scanning impulse, becomes the target that writes of pixel data.Respond above-mentioned scanning impulse, the FET11 in becoming the EL unit E that writes target of pixel data is in conducting state, and will be added to grid G and the capacitor 13 of FET12 through the above-mentioned pixel data pulses DP that data line B provides respectively.According to the pulse voltage of pixel data pulses DP, FET12 produces light emission drive current (by the electric current of the impedance decision of EL element 15), and offers EL element 15.That is, if for EL element 15 high voltage pixel data pulses DP is provided, then above-mentioned light emission drive current makes it place luminance.If low-voltage pixel data pulses DP is provided, then is placed in not luminance.Now, if during the subframe SF1 of Fig. 5, for EL element 15 high voltage pixel data pulses DP is provided, then this EL element 15 keeps luminous during the cycle " 1 ".And if during subframe SF2, for EL element 15 high voltage pixel data pulses DP is provided, then this EL element 15 keeps luminous during the cycle " 2 ".If during subframe SF3, for EL element 15 high voltage pixel data pulses DP is provided, then this EL element 15 keeps luminous during the cycle " 4 ".
Therefore, for example, if only luminous during the subframe 3 of subframe SF1 in the SF3, then only luminous in the cycle " 4 " during the frame display cycle, and human eye perceives the brightness corresponding to light period " 4 ".And if luminous during subframe SF1 and SF3, then only luminous in cycle " 1 "+" 4 "=" 5 " during the frame display cycle, and human eye perceives the brightness corresponding to light period " 5 ".Equally, if luminous during subframe SF2 and SF3, then only luminous in cycle " 2 "+" 4 "=" 6 " during the frame display cycle, and human eye perceives the brightness corresponding to light period " 6 ".
Therefore, when using three sub-frame shown in Figure 5 to drive display board 10, can realize 9 grades of intermediate luminance.
On the other hand, the above-mentioned power-off signal OFF of Drive and Control Circuit 4 responses, the light emission drive current process of measurement that execution graph 6 is introduced.
In Fig. 6, at first, Drive and Control Circuit 4 provides to scan line driver 5 and datawire driver 6 and makes whole EL unit E 1,1To E N, mFET12 be in the drive control signal (step S1) of off state.Then, Drive and Control Circuit 4 provides the current detecting enable signal CE (step 2) of logic level 1 for current detection circuit 2.Thus, current detection circuit 2 detects the voltage that between resistance R 1 two ends, produces according to the electric current that in B-power line 16, flows through, and will have the current value data-signal CD that detects magnitude of voltage and offer Drive and Control Circuit 4.That is, when interrupting whole EL unit E 1,1To E N, mOperation the time, detect the electric current that flows through in the B-power line 16.Then, Drive and Control Circuit 4 will be stored in by the current value that current value data-signal CD representes not among the glow current value register 9A, flow to the not glow current value (step 3) of display board 10 when being in display mode not.Then, Drive and Control Circuit 4 is expert at the middle storage of number register (not illustrating in the drawings) " 1 " as the initial row number, and storage " 1 " is as initial column number (step 4) in column number register (not illustrating in the drawings).Then, Drive and Control Circuit 4 provides drive control signal to scan line driver 5 and datawire driver 6, and this drive control signal only is used to drive EL unit E 1,1To E N, mIn corresponding to the EL unit E of capable number of storing among the number register X that is expert at and the column number in column number register Y, stored X, YLuminous (step S5).When carrying out step S5, scan line driver 5 is only to sweep trace A 1To A nIn by the sweep trace A of the capable number appointment of storing among the row number register X XApply scanning impulse.Simultaneously, datawire driver 6 is only to data line B 1To B mIn by those data lines B of the column number appointment of storing among the column number register Y YHigh voltage pulse is provided, and low-voltage pixel data pulses DP is provided other group among the data line B.Through aforesaid operations, light emission drive current only flows into the E in the EL unit 1,1To E N, mIn EL unit E X, YThe middle EL element 15 that forms is so that this EL element 15 is luminous.Therefore, has only EL unit E X, YEL element 15 consumed current that form flow through B-power line 16.Now, current detection circuit 2 provides the current value data-signal that is illustrated in the electric current that flows through in the B-power line 16 CD to Drive and Control Circuit 4.
Here, Drive and Control Circuit 4 obtains the current value represented by above-mentioned current value data-signal CD, and with it as measuring (step 6) in the address [X, Y] that current value is stored in light emission drive current value storer 8.Then, Drive and Control Circuit 4 column number that will be stored among the column number register Y adds 1 (step S7).Next step, Drive and Control Circuit 4 checks that whether the column number that is stored among the column number register Y is greater than last column number m (step 8).In step 8, if the column number that is stored among the column number register Y is not more than last column number m, then Drive and Control Circuit 4 jumps back to above-mentioned steps S5, and the operation that repeats here to be introduced.
Through repeating above-mentioned steps S5, measure the sweep trace A that flows through the capable number appointment of in by row number register X, storing one by one to S8 XIn whole EL unit E 1,1To E N, mIn the light emission drive current of the EL element 15 that forms, and their value is stored in the light emission drive current value storer 8.
On the other hand; In above-mentioned steps S8; If be stored in column number Y empirical tests in the column number register greater than last column number m; Then Drive and Control Circuit 4 only adds 1 (step S7) with the capable number X that storage is expert in the number register, and rewrites and be stored in the column number Y (step S9) in the column number register through writing 1.That is, through execution in step 9, the sweep trace AX that is formed by the group of the EL unit E that will measure light emission drive current moves to next bar sweep trace A X+1Drive and Control Circuit 4 checks that whether the capable number X that stores in the number register of being expert at is greater than last capable number n (step 10).In step 8, if the capable number X that stores in the number register of being expert at is not more than last capable number n, then Drive and Control Circuit 4 jumps back to above-mentioned steps S5, and the operation that repeats here to be introduced.
Through repeating above-mentioned steps S5 to S10, measure to flow through the whole EL unit E that forms display board 10 1,1To E N, mIn the light emission drive current of the EL element 15 that forms, and measurement result is stored in the light emission drive current value storer 8 relevant with each pixel.
And; In above-mentioned steps S10; The capable number X that stores in the number register if be expert at is greater than last capable number n; Then search for minimum current value in the measurement current value of Drive and Control Circuit 4 each pixel of in above-mentioned light emission drive current value storer 8, storing, and this value is stored among the reference current value register 9B (step S11).Then, Drive and Control Circuit 4 is 0 current detecting enable signal CE (step S12) for current detection circuit 2 provides logic level.Thus, the two ends of the resistance R 1 that short circuit provides in current detection circuit 2, thus the driving voltage Vc that is produced by drive voltage generating circuit 1 directly is added to B-power line 16.After accomplishing above-mentioned steps S12, Drive and Control Circuit 4 withdraws from the light emission drive current process of measurement, returns master routine (not illustrating in the drawings).
The electric current that the response user stops display operation in the display board 10 turn-offs the above-mentioned light emission drive current process of measurement of operation execution.That is, though also do not accomplish based on the display operation of view data, if independent luminous, then measurement flows into the light emission drive current of the EL element 15 of each pixel, and measurement result is stored in the light emission drive current value storer 8 as measuring current value.
Now, when the user uses operating unit 7 operation that powers on, during with the display operation of initialization display board 10, operating unit 7 provides power on signal ON for Drive and Control Circuit 4.Response power on signal ON, the brightness correction value generating routine of introducing in Drive and Control Circuit 4 execution graphs 7 is so that produce brightness correction value K.
In Fig. 7, at first, whether Drive and Control Circuit 4 inspections input pixel data PD; Repeat this inspection up to effective input pixel data PD (step S21).In step 21, when input pixel data PD, Drive and Control Circuit 4 from light emission drive current value storer 8, read corresponding to input pixel data PD measurement current value (step S22).Then, Drive and Control Circuit 4 is confirmed brightness correction value K, and this value is stored in the reference current value I among the reference current value register 9B through using REFObtain (step S23) divided by above-mentioned measurement current value.This K value offers multiplier 3 (step S24).Thus, multiplier 3 produces the pixel data LD of brightness correction for each pixel through following expression:
LD=pixel data PD brightness correction value K
=pixel data PD (reference current value I REF/ measurement current value)
Then, whether Drive and Control Circuit 4 inspections provide power-off signal OFF (step S25) by operating unit 7.In step S25, if power-off signal OFF is not provided, then Drive and Control Circuit 4 is returned and is carried out above-mentioned steps S21, and the operation that repeats here to be introduced.On the other hand, if power-off signal OFF is provided in step S25, then Drive and Control Circuit 4 withdraws from this brightness correction value generating routine, and then the light emission drive current process of measurement of execution graph 6 introductions.
Through carrying out above-mentioned brightness correction value generating routine, when being that each pixel luminescence measured drive current is with respect to above-mentioned reference current value I REFWhen becoming big, the brightness correction value that is produced makes the light period corresponding to the EL element 15 in the EL unit of each pixel shorten with respect to the cycle that pixel data PD representes.Thus, the pixel data that obtains brightness correction is as pixel data PD that provides for pixel and the product of above-mentioned brightness correction value K.
For example, if in the EL unit E 1,1The measurement current value of the middle EL element 15 that forms is 120% of a reference current value, and then the brightness correction value is 0.83, and brightness correction pixel data LD will be this EL unit E that is provided 1,1Pixel data PD multiply by 0.83.If E in the EL unit 1,2The measurement current value of the middle EL element 15 that forms is 110% of a reference current value, and then the brightness correction value is 0.91, and brightness correction pixel data LD will be this EL unit E that is provided 1,2Pixel data PD multiply by 0.91.
That is, compare the brightness correction that the mode that shortens is carried out pixel data PD with the light period in each frame of the light period in each frame of the EL element 15 of big light emission drive current and the EL element 15 of little light emission drive current.Promptly; The luminosity of the EL element 15 of big light emission drive current is greater than the luminosity of the EL element 15 of little light emission drive current; When only reducing the quantity at the light period of every frame according to the pixel data PD corresponding to EL element 15, the brightness of screen can have uniform demonstration.
Thus,, brightness in each EL element, occurs and change, also can access the demonstration of the high quality graphic that does not have irregularity in brightness corresponding to each pixel even drive the result of display board as time expand.
In addition, in the above-described embodiments, be employed in the light emission drive current value storer 8 the minimum current value current value I as a reference in the measurement current value of each pixel of storage REF, but also can adopt lowest high-current value current value I as a reference REFNow; Introduced among the step S11 as shown in figure 6; Search for lowest high-current value in the measurement current value of each pixel that Drive and Control Circuit 4 is stored in above-mentioned light emission drive current value storer 8, and be worth this as a reference that current value is stored among the reference current value register 9B.Thus, extending to its light emission drive current with the light period of each frame of EL element 15 is that pixel data PD revises brightness less than the mode of the degree of the benchmark EL element 15 with maximum light emission drive current.In this case, brightness correction value K is always greater than 1.Now, in order to confirm brightness correction pixel data LD, further add the product of pre-determined factor (being not more than 1) as the product of brightness correction value K and input pixel data.For example, if coefficient is 0.7, then can obtain brightness correction pixel data LD through following expression:
LD=pixel data PD0.7 brightness correction value K
=pixel data PD0.7 (reference current value I REF/ measurement current value)
In the above-described embodiments; The value of the light emission drive current of actual each pixel that records is stored in the light emission drive current value storer 8 as measuring current value, measures current value and above-mentioned reference current value I but also can in the light emission drive current value storer 8 relevant with each pixel, store REFPoor.
And, in display board 10, except the light emission drive current itself that flows through EL element 15, also consume some Weak currents.In this case; In order accurately to measure the light emission drive current itself that flows through EL element 15, from the current value of current detection circuit 2 detections, deduct the result who is stored in the not glow current value among the glow current value register 9A not and also can be stored in the light emission drive current value storer 8 as final measurement current value.
And; If the current value that flows through the above-mentioned measurement electric current that the light emission drive current of each pixel obtains through measurement is outside particular current value scope; Then Drive and Control Circuit 4 thinks that this EL unit E that contains pixel corresponding to this measurement current value has fault, and provides " 0 " as the brightness correction value K corresponding to this pixel to multiplier 3.Now, pixel data PD multiply by 0, and the brightness correction pixel data LD that obtains becomes 0, and forever extinguishes corresponding to the EL element 15 of this pixel.That is, Drive and Control Circuit 4 is forbidden the light emission operation corresponding to the EL unit E of failed pixel.
Still in the above-described embodiments, response user's power operation, the light emission drive current process of measurement shown in Fig. 6 is only carried out once, but also can regularly repeat.And the timing that begins to carry out above-mentioned light emission drive current process of measurement is not necessarily limited to user's power operation.For example; If the EL display device shown in Fig. 3 is integrated in the portable information terminal device of any kind, for example, mobile phone etc.; Then above-mentioned light emission drive current process of measurement also can carry out when the portable information terminal device charges, and perhaps when closing the display surface of display board 10, carries out.And the brightness correction instruction that also can respond the user is executed.Here; Desired as the brightness correction commanding apparatus, if operating unit 7 provides brightness correction control signal LAD to Drive and Control Circuit 4, then Drive and Control Circuit 4 responds above-mentioned brightness correction control signal LAD; Carry out the light emission drive current process of measurement, as shown in Figure 6.And above-mentioned light emission drive current process of measurement can carry out during light emission drive current HT measuring period in above-mentioned subframe SF1 each frame to the SF3, and is as shown in Figure 8.That is, comprising that in each frame the pixel of subframe SF1 to SF3 shows the light emission drive current of carrying out each pixel of light emission drive current process of measurement measurement in the cycle the light period.
In the above-described embodiments; The current detection circuit 2 of actual detected light emission drive current is provided between drive voltage generating circuit 1 and B-power line 16; But; Comprise at drive voltage generating circuit 1 under the situation of a plurality of independently drive voltage generating circuits, also can current detection circuit be provided for each drive voltage generating circuit.
For example, in Fig. 9, independently provide red emission drive voltage generating circuit 1R, green emission drive voltage generating circuit 1G and blue emission drive voltage generating circuit 1B as drive voltage generating circuit.Red emission drive voltage generating circuit 1R is the EL unit E in display board 10 through B-power line 16R 1,1To E N, mIn each EL unit E of glowing driving voltage is provided.Green emission drive voltage generating circuit 1G is the EL unit E in display board 10 through B-power line 16G 1,1To E N, mEach EL unit E of middle green light provides driving voltage.Blue emission drive voltage generating circuit 1B is the EL unit E in display board 10 through B-power line 16B 1,1To E N, mEach EL unit E of middle blue light-emitting provides driving voltage.Through current detection circuit 2R being provided between red emission drive voltage generating circuit 1R and the B-power line 16R, current detection circuit 2G being provided between green emission drive voltage generating circuit 1G and the B-power line 16G and between blue emission drive voltage generating circuit 1B and B-power line 16B, providing current detection circuit 2B can detect this electric current respectively.
And, shown in figure 10, can independently be provided at drive voltage generating circuit 1a that is used for showing in first district and the drive voltage generating circuit 1b that is used to show in second district as drive voltage generating circuit 1.The drive voltage generating circuit 1a in first district provides driving voltage through B-power line 16a for each the EL unit E that in the first screen area GM1, comprises the pixel demonstration.The drive voltage generating circuit 1b in second district provides driving voltage through B-power line 16b for each the EL unit E that in the second screen area GM2, comprises the pixel demonstration.Through current detection circuit 2a being provided between the drive voltage generating circuit 1a in first district and the B-power line 16a and between the drive voltage generating circuit 1b in second district and B-power line 16b, providing current detection circuit 2b can detect this electric current respectively.In addition, a display board not only can image pattern 10 that kind be divided into two districts, and can be divided into several districts arbitrarily according to the scale and the detection speed of current detection circuit.
As stated; In first aspect of the present invention; Measurement makes the independent luminous successively driving current value of each light-emitting component that contains pixel, then, the mode through above-mentioned light emission drive current value be each with corresponding to the relevant input pixel data correction brightness of the pixel of input pixel data.
Thus, according to a first aspect of the invention, change, also can obtain not having the demonstration of the high quality graphic of brightness scrambling even brightness in each EL element, occurs corresponding to each pixel as the result who prolong to drive display board.
Introduce other embodiments of the invention in detail with reference to accompanying drawing below.
Figure 11 shows the synoptic diagram of use according to another structure of the electroluminescence display device (hereinafter being called the EL display device) that is used for the display panel driving method of display image of the present invention.
Similar with shown in Fig. 3 of the EL display device shown in Figure 11, difference is to use variable drive generation circuit 1A to replace drive voltage generating circuit 1 here.
Variable drive voltage produces the above-mentioned DC driving voltage Vc that circuit 1A produces the magnitude of voltage with the driving voltage specification signal VD appointment that is provided by Drive and Control Circuit 4, and is added on the B-power line 16 of display board 10.
Current detection circuit 2 detects the electric current that in B-power line 16, flows through, and will represent that the current value data-signal CD of detected current value offers Drive and Control Circuit 4.Shown in figure 12, current detection circuit 2 is similar to Fig. 4, comprises resistance R 1, measuring switch SW and A/D converter AD between the B-power line 16 that is connected variable drive voltage generation circuit 1 and display board 10, so its operation no longer is described here.
Drive and Control Circuit 4 is passed through; For example, the sub-field method shown in Fig. 5 carries out classification (gradation display) and shows, then; After carrying out light emitting drive process of measurement shown in Figure 6, the driving voltage setting program of being introduced in Drive and Control Circuit 4 execution graphs 7.
In Figure 13, at first, Drive and Control Circuit 4 inspections are stored in the reference current value I among the above-mentioned reference current value register 9B REFWhether less than the preset upper limit current value I MAX(step S31).Upper bound current value I MAXBe the higher limit that makes the scope of the luminous light emission drive current of EL element 15, this scope makes and when being no more than predetermined power consumption number, guarantees the minimum brightness that requires.In above-mentioned steps S31, if checking reference current value I REFBe not less than upper bound current value I MAXThen Drive and Control Circuit 4 will from by before the magnitude of voltage of driving voltage specification signal VD appointment deduct result that assigned voltage value α obtains new given voltage value as driving voltage specification signal VD, then this magnitude of voltage is added to variable drive voltage and produces circuit 1 (step S32).Through execution in step S32, variable drive voltage produces circuit 1 and will only reduce to be added to B-power line 16 corresponding to the driving voltage Vc of assigned voltage value α part.Then, Drive and Control Circuit 4 is carried out the light emission drive current process of measurement of in Fig. 6, introducing (step S33) again.That is, in step S32, under situation about from the driving voltage Vc that is added to B-power line 16, deducting, carry out E again in the EL unit corresponding to assigned voltage value α result partly 1,1To E N, mIn the measurement of light emission drive current of each EL element 15.After accomplishing above-mentioned steps S33, Drive and Control Circuit 4 is returned and is carried out above-mentioned steps S31, and the process that repeats here to be introduced.That is, the driving voltage Vc that Drive and Control Circuit 4 continuation will be added to B-power line 16 reduces assigned voltage value α, up to reference current value I REFLess than upper bound current value I MAX
In above-mentioned steps S31, if checking reference current value I REFLess than upper bound current value I MAX, then Drive and Control Circuit 4 is then checked reference current value I REFWhether greater than the lower bound current value I of regulation MIN(step S34).Lower bound current value I MINBe to make EL element 15 with the luminous minimum light emission drive current value of the minimum brightness that requires.In above-mentioned steps S34, if inspection reference current value I REFBe not more than lower bound current value I MINThen Drive and Control Circuit 4 will from by before the magnitude of voltage of driving voltage specification signal VD appointment add result that assigned voltage value α obtains new given voltage value as driving voltage specification signal VD, then this magnitude of voltage is added to variable drive voltage and produces circuit 1 (step S35).Through execution in step S35, the driving voltage Vc that variable drive voltage produces circuit 1 will only have been increased corresponding to assigned voltage value α part is added to B-power line 16.After completing steps S35, Drive and Control Circuit 4 continues again the light emission drive current process of measurement of execution in step S33.That is, under situation about from the driving voltage Vc that is added to B-power line 16, adding, carry out E again in the EL unit corresponding to assigned voltage value α result partly 1,1To E N, mIn the measurement of light emission drive current of each EL element 15.After accomplishing above-mentioned steps S33, Drive and Control Circuit 4 is returned and is carried out above-mentioned steps S31, and the process that repeats here to be introduced.That is, Drive and Control Circuit 4 continues to be added to the driving voltage Vc increase assigned voltage value α of B-power line 16, up to reference current value I REFGreater than lower bound current value I MIN
In above-mentioned steps S34, as checking reference current value I REFGreater than lower bound current value I MINThe time, reference current value I REFRemain on by lower bound current value I MINWith upper bound current value I MAXIn the scope of definition, then Drive and Control Circuit 4 withdraws from the driving voltage setting program, returns and carries out master routine (not illustrating in the drawings).
Thus, through carrying out above-mentioned drive current voltage setting program, to flow through EL unit E 1,1To E N, mIn the light emission drive current of each EL element 15 in minimum light emission drive current value become and make the mode of EL element 15 luminous needed light emission drive current value in desirable brightness range regulate driving voltage Vc.
Therefore; Even as; For example, perhaps because the variation of the internal resistance value of EL element 15 appears in the result of the accumulation of luminescent lifetime etc., the gray scale of the whole screen of display board 10 also can remain in the desirable brightness range for the variation of manufacture process, the variation of environment temperature.
And; In the above-described embodiments; Produce the current detection circuit 2 that the actual detected light emission drive current is provided between circuit 1A and the B-power line 16 at variable drive voltage, still, comprise that a plurality of independently variable drive voltages produce circuit if variable drive voltage produces circuit 1; As shown in Figure 9, then also can current detection circuit be provided for each variable drive voltage produces circuit.
And, shown in figure 10, can independently be provided at drive voltage generating circuit 1a that is used for showing in first district and the drive voltage generating circuit 1b that is used to show in second district and the variable drive voltage shown in Figure 11 and produce circuit 1A.
In addition, in the above-described embodiments, carry out the driving voltage setting program that Figure 13 introduces after the light emission drive current process of measurement of in execution graph 6, introducing, but it can repeat regularly also.
And, in above-mentioned drive current process of measurement, with E in the EL unit 1,1To E N, mIn each EL element 15 in the current value that records in the minimum current value of measuring remain on by lower bound current value I MINWith upper bound current value I MAXMode in the scope of definition is carried out the adjusting of driving voltage Vc.But, also can remain on by lower bound current value I with these mean value of measuring current value MINWith upper bound current value I MAXMode in the scope of definition is carried out the adjusting of driving voltage Vc.In this case, Drive and Control Circuit 4 is the definite mean value of measuring current value of each pixel that is stored in the light emission drive current value storer 8, and is worth current value I as a reference with this REFStep S31 among execution Figure 13 is to the operation of S35.
In the present invention, if desired, can be with each EL unit E 1,1To E N, mIn minimum measure current value or each and measure the mean value of electric current and equal the predetermined reference current value (from lower bound current value I MINTo upper bound current value I MAXScope) mode regulate driving voltage Vc.
Above-mentioned reference current value I is being set REFIn, the mean value that also can adopt the glow current value that a plurality of EL elements 15 to appointment among all EL unit E that form display board 10 record is current value I as a reference REFIn addition, reference current value I REFAlso can be to a glow current value that specific EL unit E records in display board 10.In addition, this specific EL unit can be EL unit E 1,1To E N, mIn one, or specially in order to obtain reference current value I REFAnd the EL unit EX (having inner structure shown in Figure 2) that provides is shown in figure 14.In this case, EL unit EX is as EL unit E 1,1To E N, mThe same, receive the driving voltage that is provided through B-power line 16.In order to obtain current value I as a reference REFThe light emission drive current value of EL unit EX, Drive and Control Circuit 4 provides current measurement signal for datawire driver 6 and scan line driver 5.Respond this current measurement signal, datawire driver 6 is through data line B EXFor above-mentioned EL unit EX provides pixel data pulses, scan line driver 5 is through sweep trace A EXFor above-mentioned EL unit EX provides scanning impulse.Thus, light emission drive current flows through the EL element 15 among the EL unit EX, makes it luminous, and light emission drive current flows through B-power line 16.Now, current detection circuit 2 detects and flows through the light emission drive current of B-power line 16, and will represent that the current value data-signal CD of current value offers Drive and Control Circuit 4.Drive and Control Circuit 4 obtains the current value represented by current value data-signal CD, and it is stored among the reference current value register 9B current value I as a reference REF
Thus, as of the present invention second with the third aspect in introduced, for each pixel measure flow through each light-emitting component that contains pixel successively make pixel luminous each light emission drive current value [for further use] separately.According to input pixel data; Carry out the brightness correction of input pixel data based on the light emission drive current value relevant, and measure the magnitude of voltage that mode that a value in light emission drive current value equals the predetermined reference current value is adjusted to the driving voltage that each light-emitting component provides with each with pixel.
Thus, through of the present invention second and the third aspect, can prevent in screen, to occur the irregular of brightness, and the gray scale that keeps whole screen in all moment is in specific scope.
With reference to description of drawings an alternative embodiment of the invention.
Figure 15 shows the display device as an alternative embodiment of the invention.Display device is by comprising that display board 21, controller 22, pixel current value storer 23, data-signal provide circuit 24, scanning impulse to provide circuit 25, current detection circuit 26, power circuit 27, electric current to provide the element of circuit 28 and electric current summing circuit 29 to constitute.
Display board 21 comprises many data line Y 1To Y m(m is the integer greater than) and multi-strip scanning line X 1To X n(n is the integer greater than) and many power lead Z1 are to Zn.Shown in figure 15, multi-strip scanning line X 1To X nAnd many power lead Z1 are arranged in parallel with each other to Zn.Many data line Y 1To Y mWith multi-strip scanning line X 1To X nWith many power lead Z1 to the Zn cross arrangement.At many data line Y 1To Y mWith multi-strip scanning line X 1To X nPoint of crossing place arrange each pixel portion PL 1,1To PL N, mThereby, form the matrix type display board.Power lead Z1 connects mutually to Zn, forms single supply line Z, is connected to electric current summing circuit 29 subsequently.A plurality of pixel portion PL 1,1To PL N, mEach have structure shown in Figure 2.
Display board 21 is through sweep trace X 1To X nBe connected to scanning impulse circuit 25 is provided, also through data line Y 1To Y mBe connected to data-signal circuit 24 is provided.Controller 22 produces scan control signal and data controlling signal, so that under the gray level drive controlling, drive display board according to the picture signal of introducing.Scan control signal is added to scanning impulse and produces circuit 25, and data controlling signal is added to data-signal circuit 24 is provided.
Scanning impulse provides circuit 25 to be connected to sweep trace X 1To X n, and be sweep trace X according to scan control signal with predetermined order 1To X nScanning impulse is provided.
Data-signal provides circuit 24 to be connected to data line Y 1To Y m, and be to be arranged in the pixel portion that the pixel portion on the sweep trace that applies scanning impulse will drive to luminance pixel data pulses is provided through data line.
The gray scale drive scheme of display board 21 is identical with the scheme of introducing with reference to figure 2, so no longer repeat specification.
When using three sub-frame as shown in Figure 4 to drive display board, can show the shadow tone (half tone) of eight rank gray scales with the various combination of three sub-frame.
In pixel memories 23, by controller with pixel portion PL 1,1To PL N, mEach pixel current value write as data.Introduce the process of this write operation below.
Current detection circuit 26 detects from the current value of power circuit 27 to power lead Z output.Electric current provides circuit 28 according to the current value that is detected by current detection circuit 26 the drift current value to be set, and the off-set value that will detect current value offers electric current summing circuit 29.
Shown in figure 16, current detection circuit 26 comprises current measurement circuit 31 and A/D converter 32.Electric current provides circuit 28 to comprise decision circuitry 36, D/A converter 37 and current generating circuit 38, and is still shown in figure 16.
Current measurement circuit 31 is inserted between power circuit 27 and the electric current summing circuit 29.Current measurement circuit 31 has resistance R and the switch SW that is connected in parallel; Thereby when switch SW is closed; Electric current from power circuit 27 offers power circuit through switch SW, when switch SW is broken off, offers power circuit from the electric current of power circuit 27 through resistance R.The on off state of switch SW is by controller 22 controls.The voltage that current measurement circuit 31 is exported corresponding to the current value that flows through resistance R, that is, and the voltage at resistance R two ends.
A/D converter 32 converts the output voltage of current measurement circuit 31 into digital signal, and this digital signal is offered controller 22 and decision circuitry 36.Decision circuitry 36 judges whether by the leakage current values of representing from the digital signal of A/D converter 32 outputs be in preset range.In addition, decision circuitry 36 is provided with the drift current value according to judged result.Output to D/A converter 37 by the drift current value of decision circuitry 36 appointments with the form of digital signal.D/A converter 37 converts digital signal the voltage signal of analog form into, and this simulating signal is offered current generating circuit 38.The instruction control of the output voltage origin self-controller 22 of D/A converter 37.Export thus as the current generating circuit 38 of the V/I change-over circuit that voltage signal is converted into electric current and to have drift current by decision circuitry 36 designated values.
Electric current summing circuit 29 will be by current measurement circuit 31 current summation with current generating circuit 38 outputs, and total current is offered power lead Z1 to Zn.
Controller 22 is carried out leakage current and is eliminated program and light emission drive current process of measurement.Leakage current elimination program is to work as at all pixel portion PL 1,1To PL N, mIn when stopping light emitting drive, measure the program of the electric current that in display board 21, flows through as leakage current, and be used for drive current and produce the electric current of circuit 38 outputs corresponding to leakage current.The light emission drive current process of measurement is to measure pixel portion PL 1,1To PL N, mEach the program of drive current.Though need timing that carry out these programs be set at any specific time point,, can, for example, when closing the power supply of display device, when not having input image data, perhaps carry out in the interval between a sub-field and next sub-field.
In leakage current elimination program, shown in figure 17, controller 22 makes all the pixel portion PL on it of display board 21 places 1,1To PL N, mStop the state (step S41) of light emitting drive.Concrete, controller 22 stops to produce above-mentioned scan control signal and data controlling signal.Then, the output voltage that controller 22 is provided with D/A converter 37 is 0V, thereby the drift current value equals zero (step S42).When the output voltage of D/A converter 37 is 0V, turn-off thus from the output of the drift current of current generating circuit 38.In addition, controller 22 switch that current measurement circuit 31 is set is in open position (step S43).
In this state of a control, the power lead Z1 that the resistance R of the output voltage of power circuit 27 (supply voltage) Vc through current measurement circuit 31 and electric current summing circuit 29 is added to display board 21 is between Zn and the ground wire, thereby in display board 21, flows through leakage current.The output voltage of current measurement circuit 31 converts digital value into by A/D converter 32, and offers decision circuitry 36.Controller 22 drives decision circuitry 36 and makes the whether judgement (step S44) in preset range of the leakage current values represented by the digital signal of A/D converter 32 outputs.As the judged result of decision circuitry 36, if leakage current values greater than preset range, then the digital signal corresponding to the current increment that equals predetermined current value Ir outputs to D/A converter 37 (step S45).Digital signal can offer D/A converter 37 by in controller 22 and the decision circuitry 36.D/A converter 37 converts the digital signal that is provided into simulating signal, and this simulating signal is offered current generating circuit 38.Current generating circuit 38 increases predetermined current value Ir with current value, and the electric current of output increase.The output current of current generating circuit 38 offers electric current summing circuit 29.The mode of the output current through current generating circuit 38 reduces current value I r from the electric current of power circuit output.That is, flowing to display board 21 current values own from electric current summing circuit 29 remains unchanged.
When decision circuitry 36 judged that measured leakage current is in preset range, controller 22 made current generating circuit 38 keep output current value at this moment as drift current value (step S46).
Figure 18 showed before the current value of measured leakage current reaches preset range, and this measured leakage current shifts gears.The leakage current values of measuring for the first time is the value of the actual leakage current that in display board 21, flows through.For the first time, there is not electric current from current generating circuit 38 outputs.Secondary leakage current values is the value that the actual leakage current value reduces current value I r.In the second time, the output current value of current generating circuit 38 equals Ir.Like this, the j time leakage current values is from actual leakage current value I 0In deduct the value of current value (j-1) Ir.Decision circuitry 36 judges whether current value satisfies 0≤I 0-(j-1) Ir≤Ia, wherein 0 with Ia be the end value of the preset range of current value 0 to Ia.
In Figure 18, the 6th time is measured leakage current values is from the actual leakage current value, to deduct the value of current value 5Ir, and is expressed as I 0-5Ir.In the 6th time was measured, the output current value of current generating circuit 38 was 5Ir.Measure for the 6th time leakage current values at preset range 0 in Ia.Holding current produces the output current value of circuit 38 as drift current.
Shown in figure 19, electric current provides circuit 28 to be made up of analog operational circuit 39 and current generating circuit 38.Analog operational circuit 39 is offered the voltage level of current generating circuit 38 by the voltage calculating of the leakage current values of current measurement circuit 31 outputs according to expression.In brief, analog operational circuit 39 drive currents produce circuit 38 output currents (j-1) Ir, thereby satisfy condition: 0≤I 0-(j-1) Ir≤Ia.
Shown in figure 20, electric current provides circuit 28 only to be made up of current generating circuit 38.Electric current in Figure 20 provides in the circuit 28, and its output current value can be regulated by manually-operated.Utilize this characteristic, the output current of manual adjustments current generating circuit 38, thus make the measurement leakage current values of current measurement circuit 31 outputs become the current value in preset range 0 to Ia.
In addition, in Figure 16, each embodiment shown in 19 and 20, to constituting the pixel portion PL of display board 1,1To PL N, mThe EL element of the light-emitting component situation of sending same color light be illustrated.In the multiple color of luminous generation, for example, under the situation of RGB (red, green and blue), possibly be different for the driving voltage VC of every kind of glow color.In this case, can provide power circuit 27, current detection circuit 26 and electric current that circuit 28 is provided for each pixel portion that has different glow colors respectively.
The output current that holding current provides circuit 28 in above-mentioned leakage current elimination program as the drift current value after, controller 22 is pixel portion PL 1,1To PL N, mEach carry out light emission drive current process of measurement.
Shown in figure 21, controller 22 at first is expert in the number register X (not shown) storage " 1 " as the initial row number, and in column number register Y (not shown) storage " 1 " as initial column number (step S51).Subsequently, controller 22 provides circuit 25 and data-signal to provide circuit 24 to be provided for only making at pixel portion PL to scanning impulse 1,1To PL N, mIn corresponding to storage be expert at capable number and the pixel portion PL that is stored in the column number among the column number register Y among the number register X X, YLuminous drive control signal (step S52).As the execution result of step S52, scanning impulse provides 25 in circuit to sweep trace X 1To X nIn by the storage sweep trace X that capable number among the number register X representes that is expert at XScanning impulse is provided.Simultaneously, data-signal provides 24 in circuit to data line Y 1To Y mIn the data line Y that representes by the column number that is stored among the column number register Y YThe data-signal of low level (for example, earth potential) is provided, simultaneously to removing data line Y YRemaining data line in addition provides high-tension current potential.Through above-mentioned processing operation, light emission drive current only flows through pixel portion PL 1,1To PL N, mPixel portion PL X, YIn EL element, thereby this EL element is luminous.Correspondingly, has only pixel portion PL X, YIn the light emission drive current of EL element consumption flow through power lead Z YAnd Z.Current detection circuit 26 provides representative to flow through the current value data-signal CD of the current value of power lead Z to controller 22.
In this process, controller 22 obtains the current value represented by above-mentioned current value data-signal CD, and it is stored in the address [X, Y] in the pixel current value storer 23 (step S53).Then, controller 22 column number that will be stored among the column number register Y adds one (step S54).Subsequently, controller 22 judges that whether the column number that is stored among the column number register Y is greater than last column number m (step S55).If judge that in step S55 the column number that is stored among the column number register Y is not more than last column number m, then controller 22 returns and carries out above-mentioned steps S52, and repeats aforesaid operations.
Through carrying out above-mentioned steps S52 repeatedly, measure respectively successively to flow through and be arranged in by the storage sweep trace X that the capable number of number register X representes that is expert to S55 YOn pixel portion PL 1, YTo PL N, YIn the light emission drive current of EL element, and be stored in the light emission drive current storer 8.
In step S55; If by the column number of controller 22 detection of stored in column number register Y greater than last column number m; The capable number of then storing among the number register X that is expert at adds one, and the column number that is stored among the column number register Y is rewritten as 1 (step S56).In brief, through execution in step S56, move to next sweep trace X from sweep trace XX as the pixel portion of the measuring object of light emission drive current X+1On pixel portion.Controller 22 judges that also whether the capable number of storing among the number register X that is expert at is greater than last capable number n (step S57).If judge that in step S57 the capable number of storing among the number register X that is expert at is not more than last capable number n, then controller 22 returns execution in step S52, repeats aforesaid operations.
Through repeated execution of steps S52 to S57, to the pixel portion PL that in display board 21, forms 1,1To PL N, mIn all EL elements measure light emission drive currents, and measurement result is stored in the pixel current value storer 23 that corresponds respectively to pixel.
If judge that in above-mentioned steps S57 the capable number of storing among the number register X that is expert at is greater than last capable number n; Minimum current value in each pixel current value of controller 22 search pixel of storage in above-mentioned pixel current storer 23 then; And the current value that searches out is stored in the internal register (not shown), as typical electrical flow valuve (step S58).Then, controller 22 executivecontrol functions close at the switch SW (step S59) in the current measurement circuit 31.
Through this operation, the two ends of the resistance R that in current measurement circuit 31, provides are short-circuited, thereby the driving voltage Vc that power circuit 27 produces directly is added on the power lead Z.After execution in step S59, controller 22 withdraws from the light emission drive current process of measurement, and returns and carry out the master routine (not shown).
As stated, the response user stops the shutoff operation execution light emission drive current process of measurement of display board 21 display images.In other words, in the time period of the display operation that does not carry out view data, at individual drive pixel portion PL 1,1To PL N, mIn the luminous situation of each EL element under, measure the light emission drive current that flows through.Measurement result is stored in the pixel current value storer 23.Because under the situation that the leakage current component is almost removed, carry out the measurement of pixel current value, so can be to pixel portion PL 1,1To PL N, mEach carry out high precision pixel current value and measure.In addition, when using above-mentioned leakage current to eliminate program and light emission drive current process of measurement, be respectively display board the drift current value is set, can be to pixel portion PL 1,1To PL N, mEach carry out high precision pixel current value and measure.
Then,, carry out the brightness correction value generating routine shown in Figure 22, so that be the above-mentioned brightness correction value K of each pixel generation corresponding to the pixel data in the input image data in order to begin the demonstration of display board 21.
Controller 22 at first judges whether to have imported view data, and has obtained pixel data PD (step S61).Execution in step S61 repeatedly is up to obtaining pixel data PD.Then, controller 22 is read the pixel current value (step S62) corresponding to pixel data PD from pixel current value storer 23.Then, controller obtains being stored in representative value in the internal register divided by the result of above-mentioned pixel current value, as brightness correction value K (step S63), and calculates brightness correction pixel data LD (step S64) through multiply by pixel data PD with brightness correction value K.In step S64, obtain brightness correction pixel data LD through following formula.
LD=pixel data PD brightness correction value K
=pixel data PD (typical electrical flow valuve/pixel current value)
Controller 22 repeating step S61 are to the process of S64, up to the demonstration of closing screen, thereby obtain the brightness correction pixel data LD of each pixel.
Through carrying out above-mentioned brightness correction value generating routine; The light emission drive current that records with each pixel is big more with respect to above-mentioned typical electrical flow valuve, is obtaining brightness correction value K corresponding to the light period of the EL element in the pixel portion of the pixel mode short more with respect to the cycle of being represented by the pixel data of pixel.Thus, through above-mentioned brightness correction value K being multiply by result that the pixel data PD that provides corresponding to pixel obtains as brightness correction pixel data LD.
For example, if pixel portion PL 1,1Current value be 120% of above-mentioned representative value, then brightness correction value K is 0.83, thereby will be pixel portion PL 1,1The pixel data that provides multiply by 0.83 value that obtains as brightness correction pixel data LD.Equally, as pixel portion PL 1,2Current value be 110% o'clock of above-mentioned representative value, brightness correction value K equals 0.91, thereby will be pixel portion PL 1,2The pixel data that provides multiply by 0.91 value that obtains as brightness correction data LD.
That is, brightness correction influences pixel data PD with the light period in each frame of pixel portion of EL element with big drive current less than the mode of the EL element of little drive current.Briefly; Though it is bigger to have the brightness of the light that the EL element of big drive current sends; But, make in screen the apparent brightness of EL element even through shortening corresponding to the light period in the frame of the pixel data PD of EL element to the degree that overcomes the brightness increase with big drive current.
Even, also can access the high-quality demonstration that avoids irregularity in brightness according to the present invention owing to long-term use the brightness of the light that display board 21 causes sending from each EL element between different devices, to occur variation.
In the above-described embodiments, the minimum current value in the pixel current value of storage is used as the typical electrical flow valuve in pixel current value storer 23.But lowest high-current value also can be used as the typical electrical flow valuve.In this case; In step S58 shown in Figure 21; Search for lowest high-current value in each pixel current value of the pixel of controller 22 from be stored in pixel current storer 23, and the current value that searches is stored in the internal register, as the typical electrical flow valuve.Through this process, when using the maximum EL element of light emission drive current as benchmark, brightness correction is more little with light emission drive current, and the long more mode of the light period of EL element influences pixel data.Brightness correction value K always has the value greater than 1.Therefore, when brightness correction value K multiply by pixel data PD and obtains brightness correction pixel data LD, the result of multiplication multiply by the pre-determined factor less than 1 more for the first time.For example, when pre-determined factor is 0.7, calculate brightness correction pixel data LD according to following formula.
LD=pixel data PD0.7 brightness correction value K
=pixel data PD0.7 (typical electrical flow valuve/pixel current value)
In addition, in the above-described embodiments, in pixel current value storer 23, be stored as the pixel current value of each pixel actual measurement.But, also can in pixel current value storer 23, store poor corresponding between the pixel current value of each pixel and the above-mentioned typical electrical flow valuve.
After carrying out the light emission drive current process of measurement, also can adopt controller 22 to continue to carry out the scheme of the driving voltage setting program shown in Figure 23.
In Figure 23, at first, controller 22 is carried out and is stored in the typical electrical flow valuve I in the above-mentioned internal register REFWhether less than predetermined upper bound current value I MAXThe judgement of (step S71).Upper bound current value I MAXBe to make the EL element in the pixel portion luminous, keep power consumption to be lower than the higher limit of the light emission drive current of predetermined value simultaneously to be higher than other brightness of minimum necessary level.If in step S71, judge typical electrical flow valuve I REFBe not less than predetermined upper bound current value I MAX, then controller 22 will from by before the magnitude of voltage of driving voltage specification signal VD appointment deduct the driving voltage specification signal VD that scheduled voltage α obtains and offer power circuit 27 (step S72).As the result that step S72 carries out, the driving voltage Vc that power circuit 27 will reduce scheduled voltage α is added to power lead Z.Then, controller 22 is carried out above-mentioned light emission drive current process of measurement (step S73) once more.This means,, in being added to the driving voltage Vc of power lead Z, deduct under the situation of predetermined voltage α, be pixel portion PL through execution in step S72 1,1To PL N, mIn each EL element remeasure light emission drive current respectively.After execution in step S73, controller 22 returns execution in step S71, repeats said process.Briefly, controller 22 repeats said process, the driving voltage Vc that is added to power lead Z is reduced predetermined value, up to typical electrical flow valuve I REFLess than upper bound current value I MAX
In above-mentioned steps S71, if judge typical electrical flow valuve I REFLess than upper bound current value I MAX, then controller 22 is judged typical electrical flow valuve I REFWhether greater than lower bound current value I MIN(step S74).Lower bound current value I MINBe to make the lower limit of EL element with the luminous light emission drive current of the necessary gray scale of minimum.If in step S74, judge typical electrical flow valuve I REFBe not more than lower bound current value I MINThen controller 22 offers power circuit 27 (step S75) with a driving voltage specification signal VD, and this driving voltage specification signal VD is added to scheduled voltage α on the magnitude of voltage by said driving voltage specification signal VD appointment through the very short in front moment to obtain.As the result of execution in step S75, the driving voltage Vc that power circuit 27 will increase scheduled voltage α is added to power lead Z.After execution in step S75, the light emission drive current process of measurement that controller 22 continues among the execution in step S73.This means,, in being added to the driving voltage Vc of power lead Z, add under the situation of predetermined voltage α, be pixel portion PL through execution in step S72 1,1To PL N, mIn each EL element remeasure light emission drive current respectively.After execution in step S73, controller 22 returns execution in step S71, repeats said process.Briefly, controller 22 repeats this process, and the driving voltage Vc that is added to power lead Z is reduced scheduled voltage α, up to typical electrical flow valuve I REFGreater than lower bound current value I MIN
In above-mentioned steps S74, if judge typical electrical flow valuve I REFGreater than lower bound current value I MIN, mean typical electrical flow valuve I REFBe positioned at by lower bound current value I MINWith upper bound current value I MAXBetween scope in, then controller 22 withdraws from the driving voltage setting program, returns and carries out the master routine (not shown).
As stated, through carrying out the driving voltage setting program, regulate driving voltage, thereby flowing through pixel portion PL 1,1To PL N, mIn each light emission drive current in minimum one equal in desirable brightness range, to drive the luminous needed light emission drive current of EL element.
And, can the upper limit be set for driving voltage Vc, so that the protection display board.
Had above-mentioned characteristic, even, also can keep the gray scale of the whole viewing area of display board 21 because the accumulation of temperature variation or light period causes the fluctuation of the internal resistance of EL element.
As stated, according to the present invention,, can there be the display image in high quality of brightness fluctuation even use display device for a long time yet.

Claims (67)

1. display panel drive spare is used to drive the display board that the light-emitting component of a plurality of support pixels that matrix form arranges forms, and comprising:
Drive voltage generating circuit is that each of said a plurality of light-emitting components provides driving voltage through power lead;
The current measurement parts; Be used for make said light-emitting component with said light-emitting component in each the timing of fluorescent lifetime independent successively luminous in; The value of the electric current that measurement is flow through in said power lead, thus each current value obtained in the said light-emitting component; When the said light-emitting component of all that in said display board, form extinguishes; The value of the electric current that measurement is flow through in said power lead; As glow current value not; And will from said current value, deduct the result that said not glow current value obtains and be stored in the storer, as measurement current value corresponding to each pixel;
The brightness correction parts; Be used for through according to be stored in the said storer corresponding to one in the said pixel of pixel data said measurement current value; Correction is by the gray scale of representing corresponding to the pixel data of each pixel of received image signal, and obtains the pixel data of brightness correction; And
The light emitting drive parts, be used for making said light-emitting component only the image in each frame period of said received image signal show during the light period, luminous in cycle corresponding to said brightness correction pixel data.
2. according to the display panel drive spare of claim 1; Wherein said current measurement parts are in the cycle except that said image shows light period; Make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in; The value of the electric current of said power lead is flow through in measurement, as said current value.
3. according to the display panel drive spare of claim 1; Wherein said current measurement unit response is instructed in brightness correction; Make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in; The value of the electric current of said power lead is flow through in measurement, as said current value.
4. according to the display panel drive spare of claim 1, wherein said current measurement parts comprise:
Scanning light emitting drive parts make said light-emitting component independent successively luminous;
Current detection circuit, the value of the electric current that detection is flow through in said power lead; And
Parts are used for value that the timing with the fluorescent lifetime of each said light-emitting component obtains the detected electric current of said current detection circuit successively as said current value.
5. according to the display panel drive spare of claim 4, wherein said current detection circuit comprises:
Be connected in series to the resistance of said power lead;
Parts are used for the magnitude of voltage that produces at said resistance two ends is output as the digital value that can be used as said current value; And
A switch is used for the said resistance of short circuit two ends when not measuring.
6. according to the display panel drive spare of claim 1, wherein said brightness correction parts comprise:
Brightness correction value calculating unit is used to calculate the brightness correction value, thereby confirms the brightness correction value by the said measurement current value of distributing to corresponding in the said pixel of said pixel data; And
Multiplier obtains the product that said pixel data multiply by said brightness correction value, as said brightness correction pixel data.
7. according to the display panel drive spare of claim 6, wherein said brightness correction value calculating unit obtains said brightness correction value, and said brightness correction value diminishes along with the increase of said measurement current value.
8. according to the display panel drive spare of claim 6, wherein said brightness correction value calculating unit obtains said brightness correction value, and said brightness correction value becomes big along with reducing of said measurement current value.
9. according to the display panel drive spare of claim 1, comprise parts, be used for the detection failure pixel, said failed pixel is corresponding to the measurement current value of the outer said measurement current value that is stored in said storer of the current value range that is arranged in appointment; Wherein
Said light emitting drive parts comprise the parts of forbidding corresponding to the light emission operation of those light-emitting components of said failed pixel.
10. according to the display panel drive spare of claim 4, wherein said drive voltage generating circuit comprises:
First drive voltage generating circuit of driving voltage is provided for each light-emitting component that glows in the said light-emitting component that in said display board, forms through first power lead;
Second drive voltage generating circuit of driving voltage is provided for each light-emitting component of blue light-emitting in the said light-emitting component that in said display board, forms through the second source line; And
The 3rd drive voltage generating circuit of driving voltage is provided for each light-emitting component of green light in the said light-emitting component that in said display board, forms through the 3rd power lead; And
Wherein said current detection circuit comprises first current detection circuit of the electric current that detection is flow through in said first power lead; Second current detection circuit of the electric current that detection is flow through in said second source line; And the 3rd current detection circuit that detects the electric current that in said the 3rd power lead, flows through.
11. according to the display panel drive spare of claim 4, wherein said drive voltage generating circuit comprises:
When said display board is divided into a plurality of district, first drive voltage generating circuit of driving voltage is provided for the said light-emitting component of in first screen area, supporting image to show through first power lead; And
Second drive voltage generating circuit of driving voltage is provided for the said light-emitting component of in being different from second screen area in said first district, supporting image to show through the second source line; And
Wherein said current detection circuit comprises first current detection circuit at least, is used for detecting the electric current that flows through at said first power lead; With second current detection circuit, be used for detecting the electric current that flows through at said second source line.
12. a display panel driving method is used to drive the display board that the light-emitting component of a plurality of support pixels that matrix form arranges forms, and comprising:
The current measurement step; Be used for make said light-emitting component with said light-emitting component in each the timing of fluorescent lifetime independent successively luminous in; The value of the electric current that measurement is flow through in said power lead, thus each current value obtained in the said light-emitting component; When the said light-emitting component of all that in said display board, form extinguishes; The value of the electric current that measurement is flow through in said power lead; As glow current value not; And, will deduct the result that said not glow current value obtains from said current value and be stored in the storer, as measuring current value corresponding to each pixel;
The brightness correction step is used for through according to corresponding to one in the pixel of pixel data said measurement current value, revises the gray scale of representing by corresponding to the pixel data of each pixel of received image signal, and obtains the pixel data of brightness correction; And
The light emitting drive step is used for making said light-emitting component only luminous in the cycle corresponding to the said brightness correction pixel data during the demonstration of the image in each frame period of said received image signal the light period.
13. display panel driving method according to claim 12; Wherein said current measurement step comprises; In the cycle except that said image shows light period; Make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in, measure the value of the electric current that flows through said power lead, as said current value.
14. display panel driving method according to claim 12; Wherein said current measurement step comprises; Instruct in response to brightness correction; Make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in, measure the value of the electric current that flows through said power lead, as said current value.
15. according to the display panel driving method of claim 12, wherein said brightness correction step comprises:
Brightness correction value calculation procedure is confirmed the brightness correction value by the said measurement current value of distributing to corresponding in the said pixel of said pixel data; And
The step that multiplies each other is used for the product that obtains said pixel data and said brightness correction value is confirmed as said brightness correction pixel data.
16. according to the display panel driving method of claim 15, wherein said brightness correction value calculation procedure obtains said brightness correction value, said brightness correction value diminishes along with the increase of said measurement current value.
17. according to the display panel driving method of claim 15, wherein said brightness correction value calculation procedure obtains said brightness correction value, said brightness correction value becomes big along with reducing of said measurement current value.
18. display panel driving method according to claim 12; Comprising the step that is used for the detection failure pixel, said failed pixel is corresponding to the said measurement current value outside the current value range that is positioned at appointment in the said measurement current value in being stored in said storer; And
Wherein said light emitting drive step comprises the light emission operation of forbidding corresponding to the said light-emitting component of said failed pixel.
19. a display panel drive spare is used for driving the display board that the light-emitting component of a plurality of support pixels that matrix form arranges forms according to received image signal, comprising:
Drive voltage generating circuit is that each of said a plurality of light-emitting components provides driving voltage through power lead;
The current measurement parts; Be used for make said light-emitting component with said light-emitting component in each the timing of fluorescent lifetime independent successively luminous in; The value of the electric current that measurement is flow through in said power lead, thus each current value obtained in the said light-emitting component; When the said light-emitting component of all that in said display board, form extinguishes; The value of the electric current that measurement is flow through in said power lead; As glow current value not; And will from said current value, deduct the result that said not glow current value obtains and be stored in the storer, as measurement current value corresponding to each pixel; And
Driving voltage is regulated parts, is used for regulating with the mode that one of them of said measurement current value is set at the predetermined reference current value magnitude of voltage of said driving voltage.
20. display panel drive spare according to claim 19; Also comprise luminous displaing part spare, be used for making said light-emitting component only luminous in the cycle corresponding to said received image signal during the image in each frame period of said received image signal shows light period;
Wherein said current measurement parts are in the cycle outside said image shows light period; Make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in, measure flow through said power lead current value as said current value.
21. display panel drive spare according to claim 19; Wherein said current measurement unit response is instructed in brightness correction; Make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in, the value of measuring the electric current that flows through said power lead is as said current value.
22. according to the display panel drive spare of claim 19, wherein said current measurement parts comprise:
Scanning light emitting drive parts are used to make said light-emitting component independent successively luminous;
Current detection circuit is used for detecting the current value that flows through at said power lead; And
Parts are used for obtaining, with the timing of the fluorescent lifetime of each said light-emitting component, by the detected current value of said current detecting part as said current value.
23. according to the display panel drive spare of claim 22, wherein said current detection circuit comprises:
Be connected in series to the resistance of said power lead;
The magnitude of voltage that will produce at said resistance two ends is output as the parts of the digital value that can be used as said current value; And
Switch when not measuring, is used for the formation short circuit current at said resistance two ends.
24. according to the display panel drive spare of claim 19, wherein said driving voltage is regulated parts and is comprised:
The search minimum current value is measured the parts of current value in the said measurement current value in being stored in said storer as minimum; And
With the said minimum parts that mode that current value and said reference current value have the same electrical flow valuve is regulated the magnitude of voltage of said driving voltage of measuring.
25. display panel drive spare according to claim 19; Wherein said driving voltage is regulated parts and is comprised parts, is used for regulating with the mean value of the said measurement current value that is stored in said storer and mode that said reference current value has the same electrical flow valuve magnitude of voltage of said driving voltage.
26. according to the display panel drive spare of claim 19, wherein said driving voltage is regulated parts and is comprised:
Parts; Be used for regulating by this way the magnitude of voltage of said driving voltage; Promptly; Make in the said measurement current value in being stored in said storer one of them measurement current value corresponding to predetermined said pixel, perhaps mean value and the said reference current value corresponding to the measurement current value of predetermined a plurality of said pixels has the same electrical flow valuve.
27. according to the display panel drive spare of claim 22, wherein said drive voltage generating circuit comprises:
First drive voltage generating circuit is used for in the said light-emitting component that said display board forms, supporting each light-emitting component that glows driving voltage being provided through first power lead;
Second drive voltage generating circuit is used for in the said light-emitting component that said display board forms, supporting each light-emitting component of blue light-emitting driving voltage being provided through the second source line; And
The 3rd drive voltage generating circuit is used for for each light-emitting component of green light in the said support light-emitting component that said display board forms driving voltage being provided through the 3rd power lead; And
Wherein said current detection circuit comprises:
First current detection circuit is used for detecting the electric current that flows through at said first power lead; Second current detection circuit is used for detecting the electric current that flows through at said second source line; And the 3rd current detection circuit, be used for detecting the electric current that flows through at said the 3rd power lead.
28. according to the display panel drive spare of claim 22, wherein said drive voltage generating circuit comprises:
First drive voltage generating circuit when said display board is divided into a plurality of district, is used for for each said light-emitting component of supporting image to show at first screen area at least driving voltage being provided through first power lead; And
Second drive voltage generating circuit is used for for each said light-emitting component of supporting image to show at second screen area that is different from said first district driving voltage being provided through the second source line; And wherein
Said current detection circuit comprises:
At least the first current detection circuit is used for detecting the electric current that flows through at said first power lead; And
Second current detection circuit is used for detecting the electric current that flows through at said second source line.
29. a display panel driving method is used for comprising according to the display board of received image signal driving with the light-emitting component formation of a plurality of support pixels of matrix form arrangement:
The current measurement step; Be used for make said light-emitting component with said light-emitting component in each the timing of fluorescent lifetime independent successively luminous in; The value of the electric current that measurement is flow through in said power lead, thus each current value obtained in the said light-emitting component; When the said light-emitting component of all that in said display board, form extinguishes; The value of the electric current that measurement is flow through in said power lead; As glow current value not; And said current value is deducted the result that said not glow current value obtains be stored in the storer, as measurement current value corresponding to each pixel; And
The driving voltage regulating step is used for regulating with the mode that one of them of said measurement current value is set at the predetermined reference current value magnitude of voltage of said driving voltage.
30. display panel driving method according to claim 29; Also comprise luminous step display, be used for making said light-emitting component only the image in each frame period of said received image signal show during the light period luminous in the cycle corresponding to said received image signal;
Wherein said current measurement step comprises; In the cycle except that said image shows light period; Make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in, measure the value of the electric current that flows through said power lead, as said current value.
31. display panel driving method according to claim 29; Wherein said current measurement step comprises; Instruct in response to brightness correction; Make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in, measure the value of the electric current that flows through said power lead, as said current value.
32. according to the display panel driving method of claim 29, wherein said driving voltage regulating step also comprises:
The search minimum current value is measured the step of current value as minimum in said measurement current value; And
With the said minimum step that mode that current value and said reference current value have the same electrical flow valuve is regulated said driving voltage value of measuring.
33. according to the display panel driving method of claim 29, wherein said driving voltage regulating step comprises, the step that the mode that has the same electrical flow valuve with the mean value and the said reference current value of said measurement current value is regulated the magnitude of voltage of said driving voltage.
34. display panel driving method according to claim 29; Wherein said driving voltage regulating step comprises; With measurement current value corresponding to an intended pixel in the said measurement current value, the step of perhaps regulating the magnitude of voltage of said driving voltage corresponding to the mean value of the measurement current value of predetermined a plurality of pixels and mode that said reference current value has the same electrical flow valuve.
35. a display panel drive spare is used for driving the display board that the light-emitting component of a plurality of support pixels that matrix form arranges forms according to received image signal, comprising:
Drive voltage generating circuit, being used for through power lead is that each of said a plurality of light-emitting components provides driving voltage;
The current measurement parts; Be used for make said light-emitting component with said light-emitting component in each the timing of fluorescent lifetime independent successively luminous in; The value of the electric current that measurement is flow through in said power lead, thus each glow current value obtained in the said light-emitting component; When the said light-emitting component of all that in said display board, form extinguishes; The value of the electric current that measurement is flow through in said power lead; As glow current value not; And said glow current value is deducted the result that said not glow current value obtains be stored in the storer, as measurement current value corresponding to each pixel;
Driving voltage is regulated parts, is used for regulating said driving voltage value with the mode that one of them of said measurement current value is set at the predetermined reference current value;
The brightness correction parts; Be used for through according to the said measurement current value that is stored in the said storer corresponding to the said pixel of pixel data; Correction obtains the brightness correction pixel data by the gray scale of representing corresponding to the pixel data of each pixel of said received image signal; And
The light emitting drive parts, be used for making said light-emitting component only the image in each frame period of said received image signal show during the light period luminous in the cycle corresponding to said brightness correction pixel data.
36., also comprise according to the display panel drive spare of claim 35:
Luminous displaing part spare, make said light-emitting component only the image in each frame period of said received image signal show during the light period luminous in the cycle corresponding to said received image signal;
Wherein said current measurement parts comprise:
Parts; In the cycle except that said image shows light period; Make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in, measure the value of the electric current that flows through said power lead, as said glow current value.
37. according to the display panel drive spare of claim 35, wherein said current measurement parts comprise:
Parts, in response to brightness correction instruction, make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in, measure the value of the electric current that flows through said power lead, as said glow current value.
38. according to the display panel drive spare of claim 35, wherein said current measurement parts comprise:
Scanning light emitting drive parts are used to make said light-emitting component independent successively luminous;
Current detection circuit is used for detecting the current value that flows through at said power lead; And
Parts are used to obtain by the value of said current detecting part with the detected electric current of timing of the fluorescent lifetime of each said light-emitting component, as said glow current value.
39. according to the display panel drive spare of claim 38, wherein said current detection circuit comprises:
Be connected in series to the resistance of said power lead;
The magnitude of voltage that the current value that flows through in the said power lead when independence is luminous successively with said light-emitting component produces at said resistance two ends converts the parts as the digital value of said glow current value into; And
When not measuring, produce the switch of short circuit current at said resistance two ends.
40. according to the display panel drive spare of claim 35, wherein said brightness correction parts comprise:
Brightness correction value calculating unit is used for confirming the brightness correction value by distributing to corresponding to one of them said measurement current value of the said pixel of said pixel data; And
Multiplier is used to obtain the said brightness correction pixel data as the result of the product of said pixel data and said brightness correction value.
41. according to the display panel drive spare of claim 40, wherein said brightness correction value calculating unit obtains the said brightness correction value that diminishes along with the increase of said measurement current value.
42. according to the display panel drive spare of claim 40, wherein said brightness correction value calculating unit obtains becoming along with reducing of said measurement current value big said brightness correction value.
43., comprising according to the display panel drive spare of claim 35:
Parts are used in being stored in the said measurement current value of said storer, detecting the failed pixel corresponding to the measurement current value outside the current value range that is positioned at appointment;
Wherein said light emitting drive parts comprise the parts of forbidding corresponding to the light emission operation of the said light-emitting component of said failed pixel.
44. according to the display panel drive spare of claim 35, wherein said driving voltage is regulated parts and is comprised:
Parts are used in being stored in the said measurement current value of said storer, searching for minimum current value and measure current value as minimum; And
Parts are used for the said minimum magnitude of voltage that mode that current value and said reference current value have the same electrical flow valuve is regulated said driving voltage of measuring.
45. display panel drive spare according to claim 35; Wherein said driving voltage is regulated parts and is comprised, the mode that has the same electrical flow valuve with the mean value that is stored in each the said measurement current value in the said storer and said reference current value is regulated the parts of the magnitude of voltage of said driving voltage.
46. according to the display panel drive spare of claim 35, wherein said driving voltage is regulated parts and is comprised:
Parts; Be used for regulating as follows the magnitude of voltage of said driving voltage; Promptly; Corresponding to one of them measurement current value of the predetermined said pixel in the said measurement current value that is stored in the said storer, perhaps mean value and the said reference current value corresponding to the measurement current value of predetermined a plurality of pixels has the same electrical flow valuve.
47. according to the display panel drive spare of claim 38, wherein said drive voltage generating circuit comprises:
First drive voltage generating circuit is used for in the said light-emitting component that said display board forms, supporting each light-emitting component that glows driving voltage being provided through first power lead;
Second drive voltage generating circuit is used for in the said light-emitting component that said display board forms, supporting each light-emitting component of blue light-emitting driving voltage being provided through the second source line; And
The 3rd drive voltage generating circuit is used for in the said light-emitting component that said display board forms, supporting each light-emitting component of green light driving voltage being provided through the 3rd power lead; And
Wherein said current detection circuit comprises:
First current detection circuit is used for detecting the electric current that flows through at said first power lead; Second current detection circuit is used for detecting the electric current that flows through at said second source line; And the 3rd current detection circuit, be used for detecting the electric current that flows through at said the 3rd power lead.
48. according to the display panel drive spare of claim 38, wherein said drive voltage generating circuit comprises:
First drive voltage generating circuit is used for for each said light-emitting component of in first screen area of the screen of said display board, supporting image to show driving voltage being provided through first power lead; And
Second drive voltage generating circuit is used for for each said light-emitting component of supporting image to show at second screen area that is different from said first district driving voltage being provided through the second source line; And
Wherein said current detection circuit comprises first current detection circuit of the electric current that detection is flow through in said first power lead; And second current detection circuit that detects the electric current that in said second source line, flows through.
49. a display panel driving method drives the display board that the light-emitting component of a plurality of support pixels that matrix form arranges forms according to received image signal, comprising:
The current measurement step; Be used for make said light-emitting component with said light-emitting component in each the timing of fluorescent lifetime independent successively luminous in; The value of the electric current that measurement is flow through in said power lead, thus each current value obtained in the said light-emitting component; When the said light-emitting component of all that in said display board, form extinguishes; The value of the electric current that measurement is flow through in said power lead; As glow current value not; And will from said current value, deduct the result that said not glow current value obtains and be stored in the storer, as measurement current value corresponding to each pixel; And
The driving voltage regulating step is used for regulating with the mode that one of them of said measurement current value is set at the predetermined reference current value magnitude of voltage of said driving voltage;
The brightness correction step; Be used for through according to one of them the said measurement current value that is stored in the said storer corresponding to the said pixel of pixel data; Correction obtains the brightness correction pixel data by the gray scale of representing corresponding to the pixel data of each pixel of said received image signal; And
The light emitting drive step, be used for making said light-emitting component only the image in each frame period of said received image signal show during the light period luminous in the cycle corresponding to said brightness correction pixel data.
50. display panel driving method according to claim 49; Also comprise luminous step display, be used for making said light-emitting component only the image in each frame period of said received image signal show during the light period luminous in the cycle corresponding to said received image signal; And
Wherein said current measurement step comprises; In the cycle except that said image shows light period; Make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in, measure the value of the electric current that flows through said power lead, as said current value.
51. display panel driving method according to claim 49; Wherein said current measurement step comprises; Instruct in response to brightness correction; Make said light-emitting component with the timing of the fluorescent lifetime of each said light-emitting component independent successively luminous in, measure the value of the electric current that flows through said power lead, as said current value.
52. according to the display panel driving method of claim 49, wherein said brightness correction step comprises:
Brightness correction value calculation procedure is calculated the brightness correction value by one of them the said measurement current value of distributing to corresponding to the said pixel of said pixel data; And
Multiplier obtains the product of said pixel data and said brightness correction value, as said brightness correction pixel data.
53. according to the display panel driving method of claim 52, wherein said brightness correction value correction step obtains the said brightness correction value that diminishes along with the increase of said measurement current value.
54. according to the display panel driving method of claim 52, wherein said brightness correction value correction step obtains becoming along with reducing of said measurement current value big said brightness correction value.
55., also be included in the step that detects in the said measurement current value that is stored in the said storer corresponding to the failed pixel of the outer measurement current value of the current value range that is positioned at appointment according to the display panel driving method of claim 49;
Wherein said light emitting drive step comprises the step of forbidding corresponding to the light emission operation of the said light-emitting component of said failed pixel.
56. according to the display panel driving method of claim 49, wherein said driving voltage regulating step is further comprising the steps of:
The search minimum current value is measured current value as minimum in said measurement current value; And
With the said minimum magnitude of voltage that mode that current value and said reference current value have the same electrical flow valuve is regulated said driving voltage of measuring.
57. according to the display panel driving method of claim 49, wherein said driving voltage regulating step comprises, the step that the mode that has the same electrical flow valuve with the mean value and the said reference current value of said measurement current value is regulated the magnitude of voltage of said driving voltage.
58. display panel driving method according to claim 49; Wherein said driving voltage regulating step comprises; Regulate the step of the magnitude of voltage of said driving voltage as follows; That is, be stored in the said measurement current value in the said storer measurement current value corresponding to an intended pixel, perhaps mean value and the said reference current value corresponding to the measurement current value of predetermined a plurality of pixels has the same electrical flow valuve.
59. one kind has a plurality of drive units that are arranged in the display board of pixel portion wherein, each pixel portion comprises the series circuit of light-emitting component and on-off element, and this drive unit is used for driving display board according to received image signal, comprising:
The driving voltage generator is used for each series circuit of said a plurality of pixel portion is applied driving voltage;
The current measurement parts are used to measure each the current value of series circuit that is added to said a plurality of pixel portion from said driving voltage generator;
The electric current supply part, the said electric current that is used for providing at said driving voltage generator adds the drift current component corresponding to the leakage current of said display board, and resultant current is provided for each series circuit of said a plurality of pixel portion;
Memory control unit; To from current value, deduct the result that glow current value not obtains is stored in the storer as measuring current value; Wherein said current value is at each the said on-off element through said a plurality of pixel portion of conducting respectively; When making each said light-emitting component of said a plurality of pixel portion separately luminous successively; Said current measurement parts are with each luminous timing and the current value that records corresponding to said a plurality of pixel portion, and said not glow current value is all said light-emitting components of in said display board, forming when extinguishing, and measure the value of said electric current and the not glow current value that obtains; And
The brightness correction device is used for according to measuring each the luminosity output of luminescent device that current value is revised said a plurality of pixel portion corresponding to being stored in one of said storer.
60. according to the display panel driver of claim 59, wherein when the luminescent device of all said a plurality of pixel portion was in not luminance, said drift current component had selecteed value, is used for controlling the electric current from said driving voltage generator output.
61. display panel driver according to claim 59; Wherein said electric current supply part comprises to be read and decision means; When the luminescent device of all said a plurality of pixel portion is in not luminance; This is read with decision means and reads from the current value of drive current production part output as measuring leakage current, and judges that the leakage current measured is whether within predetermined current range; Also comprise controller; When the said decision means of reading when judging that said measurement leakage current is outside predetermined current range; This controller increases the control operation of the output current of said electric current supply part; And make said reading carry out said read operation and decision operation once more with decision means; And when the said decision means of reading when judging that said measurement leakage current is outside predetermined current range, said controller keeps the value of the output current of said electric current supply part as said drift current component.
62. according to the display panel driver of claim 61, wherein said reading with decision means is to convert said measurement leakage current values into numerical data, the line of numbers of going forward side by side is handled to be used for the circuit of said decision operation.
63. according to the display panel driver of claim 61, thereby wherein said reading with decision means is to carry out the circuit that simulation process is used for said decision operation according to the said measurement leakage current values of having read.
64. according to the display panel driver of claim 59, wherein said brightness correction device comprises:
The brightness data corrector; Be used for according to being stored in the measurement current value of the measurement current value of a plurality of pixel portion described in the said storer corresponding to said each pixel; Revise the gray scale of representing by pixel data of each pixel in the said incoming video signal; Thereby obtain the brightness correction pixel data, and
Emission driver is used for driving said light-emitting component each frame period at said incoming video signal, and luminous in image demonstration light period, the wherein said cycle is corresponding to said brightness correction pixel data.
65. according to the display panel driver of claim 59, wherein said brightness correction utensil has the driving voltage regulator, is used to regulate the magnitude of voltage of said driving voltage, thereby one is set at preset reference voltage with said measurement current value.
66., wherein driving voltage generator, said current measurement parts and said electric current supply part are provided for every kind of glow color of said light-emitting component according to the display panel driver of claim 59.
67. a display panel driving method, the display board that is used to have a plurality of pixel portion of arranging with matrix form, each pixel portion comprises the series circuit of light-emitting component and on-off element, is used for driving display board according to received image signal, this method comprises:
Each series circuit of said a plurality of pixel portion is applied the outputting drive voltage of driving voltage generator;
The added value that summation is obtained offers each series circuit of said a plurality of pixel portion, and the value that said summation obtains is to obtain through the drift current component that will in the said electric current that said driving voltage generator provides, add corresponding to the leakage current of said display board;
Measurement is added to each the current value of series circuit of said a plurality of pixel portion from said driving voltage generator;
The resulting result of glow current value will be stored in the storer as measuring current value will from current value, deducting not; Wherein said current value is at each the said on-off element through said a plurality of pixel portion of conducting respectively; When making each said light-emitting component of said a plurality of pixel portion separately luminous successively; Output current value to measure from said driving voltage generator corresponding to each luminous timing of said a plurality of pixel portion obtains; Said not glow current value is all said light-emitting components of in said display board, forming when extinguishing, and the value of measuring at said electric current obtains; And
According to being stored in the said storer one the corresponding current value of measuring, revise each the luminosity output of luminescent device of said a plurality of pixel portion.
CN02828406.2A 2001-12-28 2002-12-20 Panel display driving device and driving method Expired - Fee Related CN1703731B (en)

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JP2002201697A JP4302945B2 (en) 2002-07-10 2002-07-10 Display panel driving apparatus and driving method
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