CN101123068A - Display drive apparatus and display apparatus - Google Patents
Display drive apparatus and display apparatus Download PDFInfo
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- CN101123068A CN101123068A CNA2007101526353A CN200710152635A CN101123068A CN 101123068 A CN101123068 A CN 101123068A CN A2007101526353 A CNA2007101526353 A CN A2007101526353A CN 200710152635 A CN200710152635 A CN 200710152635A CN 101123068 A CN101123068 A CN 101123068A
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Abstract
A display pixel including a light-emitting element and a drive element for supplying current flowing in a current path to the light-emitting element is applied with a detection voltage based on a predetermined unit voltage. Based on a value of current flowing in the current path of the drive element, a specific value corresponding to an element characteristic of the drive element is detected. A gradation voltage corresponding to a luminance gradation of display data is generated. Based on the specific value and the unit voltage, a compensated voltagea is generated. By compensating the gradation voltage based on the compensated voltage, a compensated gradation voltage is generated. And the compensated gradation voltage is supplied to the display pixel.
Description
Technical field
The present invention relates to display drive apparatus and driving method thereof, and display device and driving method thereof, particularly drive the display drive apparatus of the display pixel possess the light-emitting component luminous, and possess the display panel of having arranged a plurality of these display pixels and the display device and the driving method thereof of displays image information by electric current is provided.
Background technology
In recent years, as the display of future generation after liquid crystal indicator, be rectangular arrangement if any dynamo-electric light-emitting component (organic EL), inorganic electroluminescent element (inorganic EL element) about possessing, perhaps the research and development of the self-luminous display device of the display panel that forms of light emitting diode light-emitting components such as (LED) are day by day in vogue.
Particularly in the self-luminous display that adopts the driven with active matrix mode, compare with known liquid crystal indicator, show that response speed is fast, and the visual angle interdependence is also little, when the height of can the high brightness high-contrastization, showing picture element becomes more meticulous etc., need not needs backlight and light guide plate as liquid crystal indicator, can further lightening so extremely superior feature so have.Therefore, wish to use from now in the various electronic equipments.
The pixel-driving circuit that in the self-luminous display of such driven with active matrix mode, has display pixel element, light-emitting component and constitute by a plurality of on-off elements (transistor) of the luminance that is used to control light-emitting component etc.
Gradation control method as this display pixel, there is following manner haply, the gray scale electric current that is about to have with the current value of video data correspondence offers display pixel, to remain in the pixel-driving circuit with the voltage composition of the current value correspondence of gray scale electric current, flow into light-emitting component based on the voltage that keeps by drive current, thus the electric current specific mode of control luminosity; The grayscale voltage that will have with the video data corresponding voltage value offers display pixel, to remain in the pixel-driving circuit with the voltage composition of the electric current correspondence that flows through according to the grayscale voltage that provides, flow into light-emitting component based on the voltage composition that keeps by drive current, thus the voltage specific mode of control luminosity.
When the electric current specific mode, even produce the situation of characteristic variations and deviation at the on-off element of pixel-driving circuit, also can suppress influence to the drive current that offers light-emitting component, so can realize the luminous action under the suitable brightness corresponding steadily in the long term with video data, but the gray scale electric current corresponding with the video data of the next or the lowest brightness write under the situation of each display pixel, there is following situation, promptly owing to the reason of write time constant, the duration of charging of data line is elongated, write activity needs long-time, can not fully carry out write activity in the predefined write time, produce the so-called deficiency that writes, cause display quality to worsen.
On the other hand, when the voltage specific mode, because can increase the electric current that when grayscale voltage is offered display pixel, flows into, so be difficult to produce and write deficiency, but because the characteristic variations of the on-off element of pixel-driving circuit, write the fashionable current value that flows through and change, the voltage composition that remains in the pixel-driving circuit changes, thereby the current value of the drive current that flows through in the light-emitting component changes.
Summary of the invention
The present invention drives the display drive apparatus of the display pixel with light-emitting component and has the display device of this display drive apparatus, the advantage that has is: suppress to write not enough generation, and the characteristic variations of the driving element of compensation display pixel makes light-emitting component carry out luminous action with the appropriate brightness gray scale with the video data correspondence for a long time.
In order to realize above-mentioned advantage, display drive apparatus of the present invention is that driving has the display drive apparatus of the display pixel of light-emitting component and driving element, possesses:
The particular value testing circuit in the time will being applied on the above-mentioned display pixel based on the detection voltage of the unit voltage of stipulating, based on the current value of the electric current stream that flows through above-mentioned driving element, detects the particular value corresponding with the element characteristic of above-mentioned driving element;
The grayscale voltage correcting circuit, according to grayscale voltage being proofreaied and correct based on the bucking voltage of above-mentioned particular value and above-mentioned unit voltage, generate and proofread and correct grayscale voltage, and provide above-mentioned display pixel, wherein, described grayscale voltage has and is used to make above-mentioned light-emitting component to carry out the magnitude of voltage of luminous action with the brightness corresponding with video data.
In order to realize above-mentioned advantage, the 1st display device of the present invention is to show and the display device of video data corresponding image information to possess:
Display panel near each intersection point of many selection wires that are configured to line direction and column direction and data line, is arranged with a plurality of display pixels, and the electric current that this display pixel has light-emitting component and will flow through the electric current stream provides the driving element of above-mentioned light-emitting component;
Select drive division, will select signal to be applied to each bar in above-mentioned many selection wires successively in predetermined timing (timing), above-mentioned display pixel that each is capable is set at selection mode successively;
Data-driven portion generates the grey scale signal corresponding with above-mentioned video data, and above-mentioned each display pixel of the row that is set to above-mentioned selection mode is provided by above-mentioned each data line;
Above-mentioned data-driven portion possesses at least:
The particular value testing circuit, passing through above-mentioned each data line, in the time of will being applied on above-mentioned each display pixel based on the detection voltage of the unit voltage of stipulating, based on the current value of the electric current stream of the above-mentioned driving element that flows through above-mentioned each display pixel, detect the corresponding particular value of element characteristic with each above-mentioned driving element of above-mentioned a plurality of display pixels;
The grayscale voltage correcting circuit, according to grayscale voltage being proofreaied and correct based on the bucking voltage of above-mentioned particular value and above-mentioned unit voltage, generate and proofread and correct grayscale voltage, and by above-mentioned each data line, above-mentioned display pixel is provided, as above-mentioned grey scale signal, wherein, described grayscale voltage has and is used to make above-mentioned light-emitting component to carry out the magnitude of voltage of luminous action with the brightness corresponding with above-mentioned video data.
In order to realize above-mentioned advantage, the 2nd display device of the present invention is, demonstration is corresponding to the display device of the image information of video data, possesses display panel, described display panel is arranged with a plurality of display pixels, described display pixel has the pixel-driving circuit of the luminance of light-emitting component and this light-emitting component of control, and above-mentioned pixel-driving circuit has at least:
The 1st on-off element is applied supply voltage by an end of electric current stream, and the other end of this electric current stream connects with the contact that is connected of above-mentioned light-emitting component, and applies the signal voltage based on above-mentioned video data;
The 2nd on-off element is applied above-mentioned supply voltage by an end of electric current stream, and the other end of this electric current stream is connected with the control terminal of above-mentioned the 1st on-off element; And
The voltage holding element is connected between the above-mentioned control terminal and above-mentioned connection contact of above-mentioned the 1st on-off element;
Above-mentioned supply voltage is set to have the 1st voltage and having that makes above-mentioned light-emitting component be the magnitude of voltage of non-luminance and makes above-mentioned light-emitting component be in the 2nd voltage of magnitude of voltage of luminance any one.
In order to realize above-mentioned advantage, the driving method of display drive apparatus of the present invention is, be used to realize the 1st driving method of the display device of the present invention of above-mentioned advantage, the driving method of display drive apparatus that has the display pixel of light-emitting component and driving element for driving, wherein, to be applied to above-mentioned display pixel based on the detection voltage of the unit voltage of stipulating, current value based on the electric current stream that flows through above-mentioned driving element, detect the particular value corresponding with the element characteristic of above-mentioned driving element, generation has makes above-mentioned light-emitting component carry out the grayscale voltage of the magnitude of voltage of luminous action with the brightness corresponding with video data, according to proofreading and correct above-mentioned grayscale voltage based on the bucking voltage of above-mentioned particular value and above-mentioned unit voltage, generate and proofread and correct grayscale voltage, above-mentioned display pixel is provided.
In order to realize above-mentioned advantage, the 1st driving method of display device of the present invention is, demonstration is corresponding to the driving method of the display device of the image information of video data, above-mentioned display device possesses display panel, described display panel is near each intersection point of many selection wires that are configured to line direction and column direction and data line, be arranged with a plurality of display pixels, the electric current that this display pixel has light-emitting component and will flow through the electric current stream provides the driving element of above-mentioned light-emitting component, described method comprises following actions, be about to select signal to be applied to each bar in above-mentioned many selection wires successively, the above-mentioned display pixel of each row is set at selection mode successively, by above-mentioned each data line, to be applied to above-mentioned each display pixel of the row of above-mentioned selection based on the detection voltage of the unit voltage of stipulating, current value based on the electric current stream of the above-mentioned driving element that flows through above-mentioned each display pixel, detect the particular value corresponding with the element characteristic of each above-mentioned driving element, according to grayscale voltage being proofreaied and correct based on the bucking voltage of above-mentioned particular value and above-mentioned unit voltage, generate and proofread and correct grayscale voltage, and provide above-mentioned each display pixel of the row of above-mentioned selection by above-mentioned each data line, wherein, described grayscale voltage has and is used to make above-mentioned light-emitting component to carry out the magnitude of voltage of luminous action with the brightness corresponding with above-mentioned video data.
In order to realize above-mentioned advantage, the 2nd driving method of display device of the present invention is, the driving method of the display device of demonstration and video data corresponding image information, above-mentioned display device possesses display panel, described display panel is arranged with a plurality of display pixels, described display pixel has the pixel-driving circuit of the luminance of light-emitting component and this light-emitting component of control, and above-mentioned pixel-driving circuit has at least:
The 1st on-off element is applied supply voltage by an end of electric current stream, and the other end of this electric current stream connects with the contact that is connected of above-mentioned light-emitting component, and applies the signal voltage based on above-mentioned video data;
The 2nd on-off element is applied above-mentioned supply voltage by an end of electric current stream, and the other end of this electric current stream is connected with the control terminal of above-mentioned the 1st on-off element; And
The voltage holding element is connected between the above-mentioned control terminal and above-mentioned connection contact of above-mentioned the 1st on-off element;
Above-mentioned driving method comprises following action, promptly, write activity, make the above-mentioned electric current stream conducting of above-mentioned the 2nd on-off element, one end of the above-mentioned electric current stream of the control terminal of above-mentioned the 1st on-off element and the 1st on-off element is electrically connected, above-mentioned supply voltage is set to have makes above-mentioned light-emitting component be the 1st voltage of the magnitude of voltage of non-luminance, will the data voltage corresponding be applied to the other end of this electric current stream with video data; Luminous action, make the above-mentioned electric current stream of above-mentioned the 2nd on-off element non-conduction, the one end electricity of the above-mentioned electric current stream of the control terminal of above-mentioned the 1st on-off element and the 1st on-off element is disconnected, above-mentioned supply voltage is set to have makes above-mentioned light-emitting component be the 2nd voltage of the magnitude of voltage of luminance, make drive current flow through above-mentioned light-emitting component, this drive current is based on the above-mentioned voltage composition that remains in the above-mentioned voltage holding element.
Description of drawings
Fig. 1 is the equivalent circuit diagram that expression is used in the major part structure of the display pixel in the display device of the present invention;
Fig. 2 is the signal waveforms of control action that expression is used for the display pixel of display device of the present invention;
The diagrammatic illustration figure of the operating state of display pixel when Fig. 3 A, 3B are the expression write activity;
The performance plot of the acting characteristic of the driving transistors of display pixel when Fig. 4 A is the expression write activity;
Fig. 4 B is the performance plot of the relation of expression drive current of organic EL and driving voltage;
Fig. 5 A, B are the diagrammatic illustration figure of operating state in maintenance when action of expression display pixel;
Fig. 6 is the performance plot of acting characteristic of maintenance when action driving transistors of expression display pixel;
Fig. 7 A, B are the diagrammatic illustration figure of operating state in luminous when action of expression display pixel;
Fig. 8 A, B are the performance plots of the part throttle characteristics of the acting characteristic of driving transistors of expression display pixel of luminous when action and organic EL;
Fig. 9 is the summary construction diagram of an embodiment of expression display device of the present invention;
Figure 10 is the major part structural drawing that expression can be used in an example of data driver in the display device of present embodiment and display pixel;
Figure 11 is the process flow diagram that the correction data of the display device of expression present embodiment is obtained an example of action;
Figure 12 is that the correction data of the display device of expression present embodiment is obtained the concept map of action;
Figure 13 is the timing diagram of an example of display driver action of the display device of expression present embodiment;
Figure 14 is the process flow diagram of an example of write activity of the display device of expression present embodiment;
Figure 15 is the concept map of write activity of the display device of expression present embodiment;
Figure 16 is the concept map that the maintenance of the display device of expression present embodiment is moved;
Figure 17 is the concept map of luminous action of the display device of expression present embodiment;
Figure 18 is the action timing diagram of object lesson of driving method that schematically shows the display device of present embodiment.
Embodiment
Below, based on illustrated embodiment, describe display drive apparatus of the present invention and driving method thereof in detail, and display device and driving method thereof.
The primary structure of＜display pixel 〉
At first, describe with reference to the primary structure and the control action thereof of accompanying drawing the display pixel that adopts in the display device of the present invention.
Fig. 1 is the equivalent circuit diagram that expression is used in the primary structure of the display pixel in the display device of the present invention.
Here, as the current-control type light-emitting component that is arranged in the display pixel, for simplicity, the situation that adopts organic EL is described.
As shown in Figure 1, the circuit structure of the display pixel that adopts in the display device of the present invention is to possess pixel-driving circuit DCx and the current-control type light-emitting component is organic EL OLED.
Pixel-driving circuit DCx for example has:
Driving transistors T1 (the 1st on-off element), its drain terminal is connected with contact N2 with the power supply terminal TMv that applies power source voltage Vcc respectively with source terminal, and gate terminal is connected with contact N1;
Keep transistor T 2 (the 2nd on-off element), its drain terminal is connected with contact N1 with power supply terminal TMv (drain terminal of driving transistors T1) respectively with source terminal, and gate terminal is connected with control terminal TMh;
Electric capacity (voltage holding element) Cx is connected between grid-source terminal of driving transistors T1 (between contact N1 and the contact N2).
And organic EL OLED is connected above-mentioned contact N2 on the anode terminal, and constant voltage Vss is applied on the cathode terminal TMc.
Here, as illustrating in the aftermentioned control action, operating state according to display pixel (pixel-driving circuit DCx), to have according to operating state and the power source voltage Vcc of different magnitudes of voltage is applied on the power supply terminal TMv, supply voltage Vss is applied on the cathode terminal TMc of EL element OLED, retentive control signal Shld is applied on the control terminal TMh, the data voltage Vdata corresponding with the gray-scale value of video data is applied on the data terminal TMd that is connected with contact N2.
And capacitor C x can be formed in the stray capacitance between grid-source terminal of driving transistors T1, also can be except that this stray capacitance capacity cell further be connected in parallel between contact N1 and the contact N2 and the electric capacity that forms.For driving transistors T1 and component structure that keeps transistor T 2 and characteristic etc., be not particularly limited, what illustrate here is the situation that adopts n channel-type thin film transistor (TFT).
The control action of＜display pixel 〉
Then, the control action (driving method) to display pixel (pixel-driving circuit DCx and organic EL OLED) with foregoing circuit structure describes.
Fig. 2 is the signal waveforms of control action that expression is used for the display pixel of display device of the present invention.
As shown in Figure 2, the operating state with display pixel (pixel-driving circuit DCx) of circuit structure shown in Figure 1 can be divided into haply: write activity writes capacitor C x with the voltage composition corresponding with the gray-scale value of video data; Keep action, the voltage composition that will write in this write activity remains among the capacitor C x; Luminous action based on by this voltage composition that keeps action to keep, makes the gray scale electric current corresponding with the gray-scale value of video data flow into organic EL OLED, makes organic EL OLED luminous with the brightness corresponding with video data.Below, with reference to the timing indicator shown in Fig. 2 each operating state is specifically described.
(write activity)
In write activity, make the non-luminous turn-off of organic EL OLED, carry out the voltage composition corresponding with the gray-scale value of video data write the action of capacitor C x.
The diagrammatic illustration figure of the operating state of display pixel when Fig. 3 A, 3B are the expression write activity.
The performance plot of the acting characteristic of the driving transistors of display pixel when Fig. 4 A is the expression write activity.
Fig. 4 B is the performance plot of the relation of expression drive current of organic EL and driving voltage.
Solid line SPw shown in Fig. 4 A is that expression adopts n channel-type thin film transistor (TFT) as driving transistors T1, connect diode, leakage-voltage between source electrodes Vds, and between leakage-source electrode electric current I ds at the characteristic line of the relation of original state.And what dotted line SPw2 represented is example driving transistors T1, the characteristic line when being accompanied by driving process generation characteristic variations.Describe in detail in the back.Some PMw on the characteristic line SPw represents the operating point of driving transistors T1.
Characteristic line SPw has the threshold voltage vt h with respect to electric current I ds between leakage-source electrode, if leakage-voltage between source electrodes Vds surpasses threshold voltage vt h, then electric current I ds is accompanied by Lou-increase of voltage between source electrodes Vds and increase non-linearly between leakages-source electrode.Promptly in the drawings, the value of representing by Veff_gs be form effectively Lou-source electrode between the voltage composition of electric current I ds, shown in (1) formula, leakage-voltage between source electrodes Vds be threshold voltage vt h and voltage composition Veff_gs and.
Vds＝Vth+Veff_gs……(1)
Solid line SPe shown in Fig. 4 B is the characteristic line of the relation of expression organic EL driving voltage Voled OLED, A-stage and drive current Ioled.And dot-and-dash line SPe2 is example expression organic EL OLED, the characteristic line when being accompanied by driving process generation characteristic variations.Describe in detail in the back.Characteristic line SPe has the threshold voltage vt h_oled with respect to driving voltage Voled, and when driving voltage Voled surpassed threshold voltage vt h_oled, drive current Ioled was accompanied by the increase of driving voltage Voled and non-linearly increases.
In write activity, at first, shown in Fig. 2, Fig. 3 A, the control terminal TMh with the retentive control signal Shld of conduction level (high level) is applied to maintenance transistor T 2 makes to keep transistor T 2 to carry out turn-on action.Thereby connect between the gate-to-drain of (short circuit) driving transistors T1, driving transistors T1 is set at the diode connection status.
Then, on power supply terminal TMv terminal, apply the first power source voltage Vcc w that is used for write activity, on data terminal TMd, apply the data voltage Vdata corresponding with the gray-scale value of video data.At this moment, with leakage-source electrode between the corresponding electric current I ds of potential difference (PD) (Vccw-Vdata) flow between leakage-source electrode of driving transistors T1.This data voltage Vdata is set to make the electric current I ds that flows between the leakages-source electrode be the magnitude of voltage of following current value, described current value is in order to make organic EL OLED and the current value of needs luminous with the brightness corresponding with the gray-scale value of video data.
At this moment, because driving transistors T1 is connected by diode, so shown in Fig. 3 B, the leakage of driving transistors T1-voltage between source electrodes Vds equals grid-voltage between source electrodes Vgs, shown in (2) formula.
Vds＝Vgs＝Vccw-Vdata……(2)
Then, these grid-voltage between source electrodes Vgs is write among the capacitor C x and (is recharged).
Here, the required condition of the value of the first power source voltage Vcc w is described.Because driving transistors T1 is the n channel-type, so for flow into Lou-source electrode between electric current I ds, the grid potential of driving transistors T1 must be positive with respect to source potential, grid potential equals drain potential, be the first power source voltage Vcc w, source potential is data voltage Vdata, so the relation of (3) formula must be set up.
Vdata＜Vccw……(3)
And, contact N2 is connected with data terminal TMd, and be connected with the anode terminal of organic EL OLED, in order to write the fashionable organic EL OLED that makes is turn-off, the current potential Vdata of contact N2 must be below the value after the voltage Vss of the cathode side terminal TMc that is added in organic EL OLED of the threshold voltage vt h_oled with organic EL OLED goes up, so the current potential Vdata of contact N2 must satisfy (4) formula.
Vdata≤Vss+Vth_oled……(4)
Here, be earthing potential 0V if make Vss, then obtain (5) formula.
Vdata≤Vth_oled……(5)
Below, obtain (6) formula from (2) formula and (5) formula.
Vccw-Vgs≤Vth_oled……(6)
Further by (1) formula, because Vgs=Vds=Vth+Veff_gs, so obtain (7) formula.
Vccw≤Vth_oled+Vth+Veff_gs……(7)
Here, even because Veff_gs=0, (7) formula also must be set up, so when Veff_gs=0, then obtain (8) formula.
Vdata＜Vccw≤Vth_oled+Vth……(8)
In other words, when write activity, under the state that diode connects, the value of the first power source voltage Vcc w must be set at the value of the relation of satisfied (8) formula.Then, the influence that the characteristic variations of driving transistors T1 and organic EL OLED is subjected to along with the continuation of the process of driving describes.The threshold voltage vt h of known drive transistor T 1 increases according to the driving process.
An example of the characteristic line when the dotted line SPw2 shown in Fig. 4 A represents to produce characteristic variations owing to the driving process, Δ Vth represents the variable quantity of threshold voltage vt h.As shown in the figure, the characteristic variations that produces owing to the driving process of driving transistors T1 is so that the almost parallel mobile variation of the characteristic line at initial stage.Therefore, in order to obtain the gray scale electric current corresponding with the gray-scale value of video data (electric current I ds between leakage-source electrode), the value of needed data voltage Vdata must only increase the variation delta Vth of threshold voltage vt h.
And known organic EL OLED is according to the driving process and high impedanceization.An example of the characteristic line when the dot-and-dash line SPe2 shown in Fig. 4 B represents to produce characteristic variations according to the driving process, organic EL OLED since driving process and characteristic variations that high impedanceization causes probably change with respect to the direction that the increment rate of driving voltage Voled reduces with respect to the characteristic line at initial stage to drive current Ioled.In other words, driving voltage Voled only increases the part of characteristic line SPe2-characteristic line SPe, this driving voltage Voled be used to flow into for make organic EL OLED with the brightness corresponding with the gray-scale value of video data the luminous and drive current Ioled of needs.Shown in the Δ Voled max of Fig. 4 B, be maximal value Ioled (max) when obtaining the highest gray scale at drive current Ioled, the part maximum of this increase.
(keeping action)
Fig. 5 A, B are the diagrammatic illustration figure of operating state in maintenance when action of expression display pixel.
Fig. 6 is the performance plot of acting characteristic of maintenance when action driving transistors of expression display pixel.
In keeping action, shown in Fig. 2, Fig. 5 A, be applied to control terminal TMh by retentive control signal Shld with cut-off level (low level), make to keep transistor T 2 to end action, disconnect the gate-to-drain of (notconnect state) driving transistors T1, remove diode and connect.Thereby shown in Fig. 5 B, maintenance is to the voltage Vds (=grid-source voltage Vgs) between drain electrode-source electrode of the driving transistors T1 of capacitor C x charging in above-mentioned write activity.
Solid line SPh shown in Fig. 6 be the diode of removing driving transistors T1 connect and with grid-source voltage Vgs the characteristic line during as constant voltage.
Dotted line SPw shown in Fig. 6 is the characteristic line when making driving transistors T1 be the diode connection.The intersection point of characteristic line SPh when the characteristic line SPw when the operating point PMh during maintenance is the diode connection is connected with the releasing diode.
Dot-and-dash line SPo shown in Fig. 6 introduces as characteristic line SPw-Vth, and the intersection point Po of dot-and-dash line SPo and characteristic line SPh represents pinch-off voltage Vpo.Here, as shown in Figure 6, in characteristic line SPh, drain electrode-voltage between source electrodes Vds is unsaturated zone in the zone from 0V to pinch-off voltage Vpo, and the zone of drain electrode-voltage between source electrodes Vds more than pinch-off voltage Vpo is the zone of saturation.
(luminous action)
Fig. 7 A, B are the diagrammatic illustration figure of operating state in luminous when action of expression display pixel.
Fig. 8 A, B are the performance plots of the part throttle characteristics of the acting characteristic of driving transistors of expression display pixel of luminous when action and organic EL.
Shown in Fig. 2, Fig. 7 A, keep the state state of connection status (remove diode) that the retentive control signal Shld of cut-off level (low level) is applied to control terminal TMh, switch to from the first power source voltage Vcc w of the terminal voltage Vcc that is used to write power supply terminal TMv and be used for luminous second source voltage vcc e.Consequently, the electric current I ds corresponding with voltage composition Vgs in remaining on capacitor C x flows between drain electrode-source electrode of driving transistors T1, provide organic EL OLED with this electric current, organic EL OLED carries out luminous action with the brightness corresponding with the current value that provides.
Solid line SPh shown in Fig. 8 A is to make the characteristic line of driving transistors T1 when voltage Vgs is constant voltage between gate-to-source.And, solid line SPe represents the load line of organic EL OLED, be with the potential difference (PD) between the cathode terminal TMc of power supply terminal TMv and organic EL OLED, the value that is Vcce-Vss forms the reverse drafting of the driving voltage Voled-drive current Ioled characteristic of organic EL OLED as benchmark.
In luminous when action,, the PMh of operating point when keeping action of driving transistors T1 moved to the intersection point PMe of the load line SPe of the characteristic line SPh of driving transistors T1 and organic EL OLED.Here, shown in Fig. 8 A, what operating point PMe represented is, be applied at the voltage with Vcce-Vss under the state between the cathode terminal TMc of power supply terminal TMv and organic EL OLED, this voltage is between source electrode-drain electrode of driving transistors T1 and the point that distributes between the anode negative electrode of organic EL OLED.In other words,, voltage Vds is applied between source electrode-drain electrode of driving transistors T1, driving voltage Voled is applied between the anode negative electrode of organic EL OLED at operating point PMe.
Here, provide the drive current Ioled of organic EL OLED not change when flowing into electric current I ds (expected value electric current) between drain electrode-source electrode of driving transistors T1 and luminous action when making write activity, operating point PMe must maintain in the zone of saturation on the characteristic line.Voled becomes maximum Voled (max) when the highest gray scale.Thereby for aforesaid PMe is maintained in the zone of saturation, the value of second source voltage vcc e must satisfy the condition of (9) formula.
Vcce-Vss≥Vpo+Voled(max)……(9)
Here, when making Vss be earthing potential 0V, obtain (10) formula.
Vcce≥Vpo+Voled(max)……(10)
The variation of＜organic element characteristic and the relation of voltage-current characteristic 〉
Shown in Fig. 4 B, organic EL OLED is according to the driving process and high impedanceization, changes on the direction that drive current Ioled reduces with respect to the increment rate of driving voltage Voled.In other words, on the direction that the slope of the load line SPe of the organic EL OLED shown in Fig. 8 A reduces, change.The figure of Fig. 8 B variation that to be record take place according to the driving process of the load line SPe of this organic EL OLED, load line produces the variation of SPe → SPe2 → SPe3.Therefore, the result is that the operating point of driving transistors T1 is accompanied by the driving process and moves on the direction of PMe → PMe2 → PMe3 on the characteristic line SPh of driving transistors T1.
At this moment, operating point is positioned at zone of saturation on the characteristic line (PMe → PMe2), the value of the expected value electric current when drive current Ioled keeps write activity, but when entering unsaturated zone (PMe3), the expected value electric current of drive current Ioled during with write activity compared and reduced, produce show bad.In Fig. 8 B, pinch-off point Po is positioned on the border of unsaturated zone and zone of saturation, and operating point PMe when promptly luminous and the potential difference (PD) between Po become the compensation surplus that high impedanceization at organic EL is used to keep OLED drive current when luminous.In other words, at each Ioled level, the potential difference (PD) that is clipped on the characteristic line SPh between the load line SPe of the track SPo of pinch-off point and organic EL, driving transistors becomes the compensation surplus.Shown in Fig. 8 B, this compensation surplus be accompanied by drive current Ioled value increase and reduce, be accompanied by the increase of the voltage vcc e-Vss between the cathode terminal TMc that is applied to power supply terminal TMv and organic EL OLED and increase.
The change of＜TFT element characteristic and the relation of voltage-current characteristic 〉
But, in the transistorized voltage gray-scale Control of utilizing above-mentioned display pixel (pixel-driving circuit) to adopt, according to electric current I ds characteristic between predefined transistor drain-voltage between source electrodes Vds-drain electrode-source electrode, setting data voltage Vdata, but shown in Fig. 4 A, threshold voltage vt h increases corresponding to the driving process, provide the current value of light emission drive current of light-emitting component (organic EL OLED) not corresponding, can not carry out luminous action with the appropriate brightness gray scale with video data (data voltage).Know, particularly when adopting amorphous silicon transistor as transistor, the variation of producing component characteristic significantly.
What illustrate here is, in amorphous silicon transistor with design load shown in the table 1, when carrying out the display action of 256 gray scales, drain electrode-voltage between source electrodes Vds, an and example of the initial stage characteristic (voltage-current characteristic) of electric current I ds between drain electrode-source electrode.
[table 1]
＜transistor design value 〉
| The gate insulator thickness | 300nm (3000) |
| The wide W of raceway groove | 500μm |
| The long L of raceway groove | 6.28μm |
| Threshold voltage vt h | 2.4V |
Voltage-current characteristic at n channel-type amorphous silicon transistor, be in the relation of electric current I ds between the drain electrode shown in Fig. 4 A-voltage between source electrodes Vds and drain electrode-source electrode, the increase of the Vth that generation is caused by the grid electric field neutralisation (from original state: SPw to high-voltage side: SPw2 moves), driving process and time changes, the gate insulating film carrier capture caused described grid electric field neutralisation by being accompanied by.Thereby making the drain electrode-voltage between source electrodes Vds that is applied on the amorphous silicon transistor is the situation of constant voltage, and electric current I ds reduces between drain electrode-source electrode, and the brightness of light-emitting component reduces.
In the variation of this element characteristic, because mainly be that threshold voltage vt h increases, shape after the voltage-current characteristic line of amorphous silicon transistor (V-I characteristic line) moves for the characteristic line that makes original state is almost parallel, so the V-I characteristic line SPw2 after moving can be roughly consistent with following voltage-current characteristic, described voltage-current characteristic is, for original state drain electrode-voltage between source electrodes Vds of V-I characteristic line SPw, the voltage-current characteristic of the addition constant voltage corresponding when (being equivalent to aftermentioned bias voltage Vofst) (only with the parallel mobile Δ Vth of V-I characteristic line SPw time) simply with the variation delta Vth (being about 2V in the drawings) of threshold voltage vt h.
In other words, its meaning is, when video data being write the write activity of display pixel (pixel-driving circuit DCx), data voltage (be equivalent to aftermentioned and proofread and correct grayscale voltage Vpix) after the pairing constant voltage of variation delta V (bias voltage Vofst) the phase adduction of the element characteristic (threshold voltage) by the driving transistors T1 that will be provided with in this display pixel is proofreaied and correct is applied to the source terminal (contact N2) of driving transistors T1, can compensate because the moving of the voltage-current characteristic that the variation of the threshold voltage vt h of this driving transistors T1 causes, make the drive current Iem that has with the current value of video data correspondence flow into organic EL OLED, can carry out luminous action with the brightness of expectation.
And, also can carry out simultaneously retentive control signal Shld is switched to the maintenance action of cut-off level and power source voltage Vcc switched to the luminous action of voltage vcc e from voltage vcc w from conduction level.
Below, the display device for a plurality of display pixels 2 dimensions with the primary structure that comprises above-mentioned pixel-driving circuit are arranged the display panel that forms illustrates its one-piece construction and is specifically described.
＜display device 〉
Fig. 9 is the summary construction diagram of an embodiment of expression display device of the present invention.
Figure 10 is the major part structural drawing that expression can be used in an example of data driver in the display device of present embodiment and display pixel.
And, in Figure 10, show symbol with the corresponding circuit structure of above-mentioned pixel-driving circuit DCx (with reference to Fig. 1).In Figure 10, for the convenience that illustrates, for various signals and the data sent between each structure by data driver, and electric current that applies and voltage, illustrate with arrow easily all, but as described later, these signals and data, electric current and voltage are not limited to send simultaneously or apply.
As Fig. 9, shown in Figure 10, the display device 100 of present embodiment possesses:
Select driver (selection drive division) 120, it will select signal Ssel to be applied on each selection wire Ls in predetermined timing;
Power supply driver (power drives portion) 130, itself and selection wire Ls are parallel, and in predetermined timing the power source voltage Vcc of prescribed voltage level are applied to a plurality of power voltage line Lv that dispose on line direction;
Data driver (display drive apparatus, data-driven portion) 140, it provides each data line Ld in predetermined timing with grey scale signal (proofreading and correct grayscale voltage Vpix);
Shows signal generative circuit 160, based on the picture signal that provides from for example outside of display device 100, the video data that generation is made of digital signal (brightness data), digit driver 140 is provided, and extraction or generation are used for showing on display panel 110 based on this video data the timing signal (system clock etc.) of specified image information, and said system controller 150 is provided.
Below, above-mentioned each structure is described.
(display panel)
In the display device 100 of present embodiment, as shown in Figure 9, be configured to upper area and lower zone that rectangular a plurality of display pixel PIX are grouped into display panel 110 on the substrate of display panel 110, the display pixel PIX that comprises in each group is connected respectively on each power voltage line Lv of branch.In other words, independently export power source voltage Vcc that 1st～n/2 capable display pixel PIX to the upper area of display panel 110 jointly apply and power source voltage Vcc that the 1+n/2～n of lower zone capable display pixel PIX jointly applied in different timings by different power voltage line Lv by power supply driver 130.Select driver 120 and data driver 140 also can be configured in the display panel 110, perhaps also can will select driver 120, power supply driver 130 and data driver 140 to be configured in the display panel 110.
(display pixel)
The display pixel PIX that present embodiment adopts is configured in and the selection wire Ls that selects driver 120 to be connected, near the intersection point of the data line Ld that is connected with data driver 140, for example as shown in figure 10, possess: the light-emitting component of current-control type is organic EL OLED; With the primary structure that comprises above-mentioned pixel-driving circuit DCx (with reference to Fig. 1), generate the pixel-driving circuit DC of the light emission drive current that is used for light emitting drive organic EL OLED.
Pixel-driving circuit DC possesses: transistor Tr 11 (diode connection transistor; The 2nd on-off circuit), its gate terminal is connected with selection wire Ls, and drain terminal is connected with power voltage line LV, and source terminal is connected with contact N11; Transistor Tr 12 (selection transistor), its gate terminal is connected with selection wire Ls, and source terminal is connected with data line Ld, and drain terminal is connected with contact N12; Transistor Tr 13 (driving transistorss; Driving element, the 1st on-off circuit), its gate terminal is connected with contact N11, and drain terminal is connected with power voltage line Lv, and source terminal is connected with contact N12; With capacitor C s (voltage holding element), be connected (between the grid-source terminal of transistor Tr 13) between contact N11 and the contact N12.
Here, driving transistors T1 shown in the primary structure (Fig. 1) of transistor Tr 13 and above-mentioned pixel-driving circuit DCx is corresponding, transistor Tr 11 with keep transistor T 2 corresponding, capacitor C s is corresponding with capacitor C x, contact N11 and contact N12 respectively with contact N1 and contact N2 correspondence.The selection signal Ssel that is applied to selection wire Ls from selection driver 120 is corresponding with above-mentioned retentive control signal Shld, is applied to grey scale signal (proofread and correct grayscale voltage Vpix or detect voltage Vdet) and the above-mentioned data voltage Vdata correspondence of data line Ld from data driver 140.
The anode terminal of organic EL OLED is connected with the contact N12 of above-mentioned pixel-driving circuit DC, is that reference voltage V ss is applied to cathode terminal TMc with constant low-voltage.
Here, in the drive controlling action of display device described later, during grey scale signal that will be corresponding with video data (proofreading and correct grayscale voltage Vpix) provides the write activity of pixel-driving circuit DC, be applied to during correction grayscale voltage Vpix, the reference voltage V ss that applies by data driver 140, the luminous action noble potential of power voltage line Lv power source voltage Vcc (=Vcce) satisfy the relation of above-mentioned (3)～(10), therefore write fashionable organic EL OLED and do not light.
And capacitor C s can be formed in the stray capacitance between the gate-to-source of transistor Tr 13, also can be except that this stray capacitance, and also at the capacity cell that connects between contact N11 and the contact N12 outside the transistor Tr 13, both of these case all is fine.
For transistor Tr 11～Tr13, be not particularly limited, can be all to constitute, thereby adopt the amorphous silicon film transistor of n channel-type by for example field effect transistor of n channel-type.At this moment, can utilize the amorphous silicon manufacturing technology of having determined, with the pixel-driving circuit DC of easy manufacture method manufacturing by the stable amorphous silicon film transistor formation of acting characteristic (electronics degree of excursion etc.).In the following description, to all describing by the situation of n channel-type thin film transistor (TFT) transistor formed Tr11～Tr13.
Circuit structure for display pixel PIX (pixel-driving circuit DC), be not limited to structure shown in Figure 10, it can have following structure, promptly possess with driving transistors T1 shown in Figure 1 at least, keep transistor T 2 and capacitor C x corresponding elements, the electric current stream of driving transistors T1 and current-control type light-emitting component (organic EL OLED) are connected in series, and also can have other circuit structure.And the light-emitting component for carried out light emitting drive by pixel-driving circuit DC is not limited to organic EL OLED, also can be the light-emitting component of other current-control types such as light emitting diode.
(selection driver)
(power supply driver)
Here, in the present embodiment, as shown in Figure 9, display pixel PIX is grouped into for example upper area and the lower zone of display panel 110, each power voltage line Lv of branch is configured in each group, so during above-mentioned each action,, apply power source voltage Vcc with same voltage level by power voltage line Lv in this zone branch configuration for being arranged in the display pixel PIX that (is included in same group) in the same area.
And, power supply driver 130 can adopt following structure, this structure has: timing generator (for example exporting the shift register of shift signal etc. successively), based on the power control signal that provides from system controller 150, generate the corresponding timing signal of power voltage line Lv with each zone (group); Output circuit portion, timing signal is transformed into prescribed voltage level, and (magnitude of voltage Vccw Vcce), exports each regional power voltage line Lv to as power source voltage Vcc.
(data driver)
Here, for example as shown in figure 10, data driver 140 has: shift register data register portion (gradation data transfer circuit, the particular value transfer circuit, the correction data transfer circuit) 141, grayscale voltage generating unit (grayscale voltage generative circuit) 142, bias voltage generating unit (particular value testing circuit, detect voltage setting circuit, particular value extracts circuit, the bucking voltage generative circuit) 143, voltage adjustment part (grayscale voltage correcting circuit) 144, electric current comparing section (particular value testing circuit, current comparison circuit) 145, frame memory (circuit is recalled in storage) 146.Here, grayscale voltage generating unit 142, bias voltage generating unit 143, voltage adjustment part 144 and electric current comparing section 145 are arranged on the data line Ld of each row, in the display device 100 of present embodiment, the m group are set.And, in the present embodiment, as shown in figure 10, the situation that frame memory 146 is built in the data driver 140 is illustrated, but is not limited thereto, also can be arranged on the outside of data driver 140 independently.
Shift register data register portion 141 possesses: for example, shift register based on the data controlling signal that provides from system controller 150, is exported shift signal successively; Data register, based on this shift signal, to send the grayscale voltage generating unit 142 that is provided with at each row from the video data that shows signal generative circuit 160 provides to, then, when correction data obtains action, obtain from the correction data of bias voltage generating unit 143 outputs of each row setting, export frame memory 146 to, and, when write activity and correction data obtain when action, obtain from the correction data of frame memory 146 outputs, be sent to bias voltage generating unit 143.
Shift register data register portion 141 at least optionally carries out following arbitrary action, the video data (brightness data) of display pixel PIX correspondence of per 1 row of and display panel 110 that provide successively as serial data from shows signal generative circuit described later 160 promptly is provided successively, is sent to the action of the grayscale voltage generating unit 142 that each row is provided with; The result that compares to determine based on electric current comparing section 145, obtain bias voltage generating unit 143 outputs that are provided with from each row, with the corresponding correction data of variable quantity of the element characteristic (threshold voltage) of the transistor Tr 13 of each display pixel PIX (pixel-driving circuit DC) and transistor Tr 12, be sent to the action of frame memory 146 successively; Obtain the above-mentioned correction data of the display pixel PIX of specific 1 row successively from frame memory 146, be sent to the bias voltage generating unit 143 that each row is provided with.To describe in detail in the back for these actions.
Grayscale voltage generating unit 142 is based on the video data of each the display pixel PIX that obtains by above-mentioned shift register data register portion 141, generate former grayscale voltage Vorg and output, described former grayscale voltage Vorg has the magnitude of voltage that is used to make organic EL OLED to carry out luminous action with the brightness of regulation or does not have luminous action (black display action).
Here, has structure with the former grayscale voltage Vorg of video data corresponding voltage value as generation, can adopt following structure, this structure has: for example, based on from the gray scale reference voltage (reference voltage corresponding with the grey that comprises the video data) that the illustrated power supply portion of providing provides is provided, the digital signal voltage of above-mentioned video data is transformed into the digital-to-analog converter (D/A transducer) of logical signal voltage; With the output circuit of this analog signal voltage being exported as above-mentioned former grayscale voltage Vorg in predetermined timing.
Bias voltage generating unit 143 is based on the correction data of obtaining from frame memory 146, and bias voltage (bucking voltage) Vofst that generation is corresponding with the variations in threshold voltage amount (being equivalent to the Δ Vth shown in Fig. 4 A) of the transistor Tr 13 of each display pixel PIX (pixel-driving circuit DC) also exports.Here, when pixel-driving circuit DC has circuit structure shown in Figure 10, the sense of current that flows into data line Ld when write activity is set to, flow to data driver 140 sides from data line Ld, thus bias voltage (bucking voltage) Vofst that generates also be set so that electric current from power voltage line Lv by between the drain electrode-source electrode of transistor Tr 13, between the drain electrode-source electrode of transistor Tr 12, the mode of data line Ld flows.
Particularly, when write activity, for satisfying the value of following formula (1).
Vofst＝Vunit×Minc……(11)
Here, Vunit is a unit voltage, is predefined voltage least unit and for negative potential.Minc is a bias set value, is the digital correcting data of reading from frame memory 146.Describe in detail in the back.
Like this; bias voltage Vofst is; make by the mode between drain electrode-source electrode of proofreading and correct the correction gray scale electric current inflow transistor Tr13 behind the current value that grayscale voltage Vpix is approximated to normal gray scale, proofread and correct the voltage after the variations in threshold voltage amount of the variations in threshold voltage amount of transistor Tr 13 of each display pixel PIX (pixel-driving circuit DC) and transistor Tr 12.
On the other hand, the correction data of carrying out before above-mentioned write activity obtains in the action, the value of the bias set value Minc that appropriate change and above-mentioned unit voltage Vunit multiply each other, and Minc becomes optimal value until bias set value (variable), to realize optimization.Particularly, the bias voltage Vofst of the value correspondence of the bias set value Minc at generation and initial stage, the result that compares to determine based on from 145 outputs of electric current comparing section exports this bias set value Minc to shift register data register portion 141 as above-mentioned correction data.
For example can be, inside in bias voltage generating unit 143 possesses counter, it is with the clock frequency action of regulation, when importing the signal of the assigned voltage value of obtaining according to the timing of clock rate C K, make the value of counter increase by 1, based on the above-mentioned result that compares to determine, modulate the evaluation (for example increasing) of this counter successively, set such bias set value Minc, also can provide the setting value of suitably carrying out the ovennodulation processing from system controller 150 grades based on the above-mentioned result that compares to determine.
And, unit voltage Vunit can be set in any constant voltage, but set the absolute value of voltage of this unit voltage Vunit more little, then can make the mutual voltage difference of bias voltage Vofst more little, so in write activity, the approximate bias voltage Vofst of variations in threshold voltage amount can be generated, grey scale signal can be meticulousr and more suitably proofreaied and correct according to the transistor Tr 13 of each display pixel PIX (pixel-driving circuit DC).
As the magnitude of voltage that is set at this unit voltage Vunit, can adopt in for example transistorized voltage-current characteristic (for example, the performance chart shown in Fig. 4 A) drain electrode of the adjacent gray scale-mutual voltage difference of voltage between source electrodes Vds.Such unit voltage Vunit can be stored in the bias voltage generating unit for example 143 and in the storeies that are provided with in the data driver 140, also can provide from for example system controller 150 grades, temporarily is kept in the registers that are provided with in the data driver 140.
At this moment, preferably unit voltage Vunit is set at, deduct drain electrode-voltage between source electrodes Vds_k+1 (minimum potential difference (PD) in＞the potential difference (PD) after Vds_k) of (k+1) gray scale at the drain electrode-voltage between source electrodes Vds_k (positive magnitude of voltage) of the k gray scale (k is an integer, and big more brightness is high more) of transistor Tr 13.For the such thin film transistor (TFT) of transistor Tr 13, non-crystalline silicon tft particularly, if with the organic EL OLED combination of luminosity with respect to the current density substantially linear increase of the electric current that flows through, then in general, gray scale is high more, promptly drain electrode-voltage between source electrodes Vds is high more, that is to say that electric current I ds is big more between drain electrode-source electrode, and the potential difference (PD) between then adjacent gray scale is more little.In other words, under the situation of the voltage gray-scale Control of carrying out 256 gray scales (make the 0th gray scale not luminous), the potential difference (PD) between the voltage Vds of maximum brightness gray scale (for example the 255th gray scale) and the voltage Vds of the 254th gray scale is minimum in the potential difference (PD) between adjacent gray scale.Therefore, preferred unit voltage Vunit is that the drain electrode-voltage between source electrodes Vds of next brightness of maximum brightness gray scale (near the perhaps rank it) deducts drain electrode-voltage between source electrodes Vds value afterwards of this maximum brightness gray scale (near the perhaps rank it).
And in write activity, proofreading and correct grayscale voltage Vpix is the value that satisfies following formula (2).
Vpix＝Vorg+Vofst……(12)
Promptly, the bias voltage Vofst of will be based on the correction data of taking out from frame memory 146 and being generated by bias voltage generating unit 143 is (when grayscale voltage generating unit 142 has D/A converter) or digitally add corresponding to the former grayscale voltage Vorg from the video data of grayscale voltage generating unit 142 outputs logically, and the voltage composition that its summation is constituted exports data line Ld to when write activity as proofreading and correct grayscale voltage Vpix.
The inside of electric current comparing section 145 has galvanometer (amperometric determination circuit), obtain in the action in correction data, by being applied to data line Ld by the detection voltage Vdet that above-mentioned voltage adjustment part 144 generates, utilize and be applied to power source voltage Vcc on the power voltage line the Lv (=potential difference (PD) that produces between Vccw), measure the current value of the detection electric current I det that flows into this data line Ld, relatively the expectation electric current I ref_x that constitutes of the rated current value of this current value and predefined regulation gray scale x (for example maximum brightness gray scale) (for example in order to make organic EL OLED and the current value that need luminous with the maximum brightness gray scale) exports its magnitude relationship (relatively judged result) to above-mentioned bias voltage generating unit 143.
This expectation current value I ref_x and following current value correspondence, described current value is, driving transistors (driving element, the 1st on-off circuit) Tr13 at pixel-driving circuit DC is in original state, keep hardly can be owing to the state of the initial characteristic of the variation of the process of driving producing component characteristic the time current value of the electric current I ds between will drain electrode-source electrode of driving transistors Tr13 when detecting voltage Vdet and deduct voltage behind the unit voltage Vunit and be applied to data line Ld, that flow into pixel-driving circuit DC.As mentioned above, under the mutual situation of voltage difference as unit voltage Vunit of the drain electrode-voltage between source electrodes Vds that adopts adjacent gray scale, the current value of the electric current I ds between leakage-source electrode in the time of will being applied to data line Ld than the grayscale voltage that detects low 1 gray scale of voltage Vdet, that flow into the driving transistors Tr13 that keeps initial behavior regime is expectation current value I ref.
Here, expectation current value I ref can be stored in and for example be arranged in the electric current comparing section 145 or in the storer in the data driver 140, also can be provided by for example system controller 150 grades, is kept in the register that is arranged in the data driver 140 temporarily.And when write activity, the correction grayscale voltage Vpix that is generated by above-mentioned voltage adjustment part 144 is applied to display pixel PIX by data line Ld, do not detect electric current mensuration and with the comparison process of expectation electric current.Therefore, for example, also can further have the structure of bypass current comparing section 145 when write activity.
The correction data of carrying out before at the write activity that video data (proofreading and correct grayscale voltage Vpix) is write each the display pixel PIX that arranges on the display panel 110 obtains in the action, frame memory 146 obtains successively by shift register data register portion 141 to be set in the bias voltage generating unit 143 that is arranged on each row, the bias set value Minc of the display pixel PIX of every row, as correction data, be stored in each zone of each display pixel PIX of each picture of display panel (1 frame), and in write activity, export the correction data of display pixel PIX of per 1 row to bias voltage generating unit 143 successively by shift register data register portion 141.
(system controller)
At selecting driver 120, power supply driver 130 and data driver 140 wait each device, system controller 150 generates control action State Selection control signal respectively, power control signal and data controlling signal and output, thereby each driver is moved with predetermined timing, generate and export selection signal Ssel with prescribed voltage level, power source voltage Vcc, detect voltage Vdet and proofread and correct grayscale voltage Vpix, (correction data obtains action to carry out a series of drive controlling action at each display pixel PIX (pixel-driving circuit DC), write activity, keep action and luminous action), carry out on display panel 110 demonstration based on the control of the image information of the regulation of picture signal.
(shows signal generative circuit)
Shows signal generative circuit 160 extracts the brightness signal content from the picture signal that for example outside of display device 100 provides, per 1 row at display panel 110, provide data driver 140 with this brightness signal content, as the video data that constitutes by digital signal (brightness data).Here, the situation of timing signal composition that as TV sending signal (synthesized image signal), comprises the Displaying timer of specified image information in above-mentioned picture signal, shows signal generative circuit 160 is except the function of extracting above-mentioned brightness signal content, can also have the timing signal of extraction composition, and the function of system controller 150 is provided.At this moment, said system controller 150 is based on the timing signal that provides from shows signal generative circuit 160, and generating to divide provides each control signal of selecting driver 120, power supply driver 130 and data driver 140 indescribably.
The driving method of＜display device 〉
Below, the driving method of the display device of present embodiment is described.
The drive controlling action of the display device 100 of present embodiment has following action haply: correction data is obtained action, promptly detect on the display panel 110 transistor Tr 13 (driving transistors) that the light emitting drive of each the display pixel PIX (pixel-driving circuit DC) that arranges uses element characteristic (threshold voltage) the pairing bias voltage Vofst of variation (strictly speaking, be to detect voltage Vdet and detect electric current I det), as the correction data of each display pixel PIX, the bias set value (particular value) that will be used for generating this bias voltage Vofst is stored in frame memory 146; The display driver action, promptly based on the correction data that in each display pixel PIX, obtains, proofread and correct the former grayscale voltage Vorg corresponding with video data, write among each display pixel PIX as proofreading and correct grayscale voltage Vpix, preserve as the voltage composition, based on this voltage composition, the light emission drive current Iem that will have the pairing current value of video data of the influence that the element characteristic of compensation transistor Tr13 changes provides organic EL OLED, makes its brightness with regulation luminous.These correction datas obtain action and display driver and move and the various control signals that provide from system controller 150 to be provided to carry out.
Below, each action is specifically described.
(correction data obtains action)
Figure 11 is the process flow diagram that the correction data of the display device of expression present embodiment is obtained an example of action.
Figure 12 is that the correction data of the display device of expression present embodiment is obtained the concept map of action.
As shown in figure 11, the correction data of present embodiment obtains action, and (bias voltage detects action: the 1st step) at first by shift register data register portion 141 the bias set value Minc of the display pixel PIX of i capable (positive integer of 1≤i≤n) (initially time Minc=0) is read in bias voltage generating unit 143 (step S111) from frame memory 146, afterwards, identical with the write activity of above-mentioned pixel-driving circuit DCx, with the write activity level power source voltage Vcc (=Vccw≤reference voltage V ss of electronegative potential from power supply driver 130; The 1st voltage) be applied to power voltage line Lv that the display pixel PIX of capable with i (positive integer of 1≤i≤n) is connected (in the present embodiment, be connected the power voltage line Lv of the whole display pixel PIX that comprise the capable group of i jointly) state under, from selecting driver 120 will select the selection signal Ssel of level (high level) to be applied to the capable selection wire Ls of i, the display pixel pix setup that i is capable is selection mode (step S112).
Thereby, the transistor Tr 11 that is provided with among the pixel-driving circuit DC of the display pixel PIX that i is capable is carried out turn-on action, transistor Tr 13 (driving transistors) is set at the diode connection status, with above-mentioned power source voltage Vcc (=Vccw) be applied to the drain terminal and gate terminal (the contact N11 of transistor Tr 13; Capacitor C s's is one distolateral), and transistor Tr 12 also becomes conducting state, the source terminal of transistor Tr 13 (contact N12; The other end of capacitor C s) and each column data line Ld be electrically connected.
Then, based on the bias set value Minc that inputs to bias voltage generating unit 143, shown in above-mentioned formula (1), set bias voltage Vofst (step S113).Here, the bias voltage Vofst that generates in bias voltage generating unit 143 multiplies each other bias set value Minc and unit voltage Vunit and calculates (Vofst=Vunit * Minc), so, when initial, do not having under the situation of threshold shift, from the bias set value Minc=0 of frame memory 146 outputs, the initial value of bias voltage Vofst is 0V.
Vdet(p)＝Vofst(p)+Vorg_x……(13)
Here, the p of Vdet (p) and Vofst (p) is the offset control number of times that correction data obtains action, and is natural number, and according to the change of aftermentioned bias set value, value increases successively.Therefore, Vofst (p) is the increase along with p, the variable that the negative value that absolute value also increases constitutes, and Vdet (p) is the increase along with Vofst (p), promptly along with the increase of p, the variable that the negative value that absolute value also increases constitutes.
Therefore, by transistor Tr 12 with above-mentioned detection voltage Vdet (=Vofst+Vorg_x) be applied on the source terminal (contact N12) of transistor Tr 13, and the power source voltage Vcc w of electronegative potential is applied to the gate terminal (contact N11) and the drain terminal of transistor Tr 13, so will and detect the suitable voltage composition of the difference of voltage Vdet and power source voltage Vcc w (| Vdet-Vccw|) be applied between the gate-to-source of transistor Tr 13 (two ends of power supply Cs), transistor Tr 13 is carried out turn-on action.
Here, if the magnitude of voltage (theoretical value) of the former grayscale voltage Vorg_x that grayscale voltage generating unit 142 is exported in the design, can make the indicated display pixel PIX (organic EL OLED) of the detected object of the bias voltage Vofst corresponding carry out luminous action with brightness (for example x gray scale) arbitrarily with the variation of the threshold voltage vt h of transistor Tr 13, add that then the detection voltage Vdet that obtains after the bias voltage Vofst is set to, be applied to the magnitude of voltage (Vdet=Vofst+Vorg_x＜Vccw≤0) that the power source voltage Vcc w of the write activity level (low level) of display pixel PIX has negative polarity from power supply driver 130 relatively.The video data that is used to specify the gray scale (x gray scale) of former grayscale voltage Vorg_x can be stored in the inside of grayscale voltage generating unit 142 in advance, also can be from the outside input of data driver 140.
Then, will detect from above-mentioned voltage adjustment part 144 under the state that voltage Vdet is applied to data line Ld, and utilize the galvanometer that is arranged in the electric current comparing section 145 to measure the current value (step S116) that flows into the detection electric current I det among this data line Ld.Here, the voltage relationship of display pixel PIX is, the detection voltage Vdet that current potential is lower than the low potential power source voltage vcc w that is applied to power voltage line Lv is applied to data line Ld, so above-mentioned detection electric current I det flows to data driver 140 (voltage adjustment part 144) direction by data line Ld from display pixel PIX side.
Then, carry out the electric current comparison process, the current value that compares the detection electric current I det that in electric current comparing section 145, measures by galvanometer, with make display pixel PIX (organic EL OLED) carry out luminous when action to flow into the design load (current value of expectation electric current I ref) of the electric current of data line Ld, should compare judged result (magnitude relationship) and export bias voltage generating unit 143 (step S117) to above-mentioned brightness arbitrarily (for example x gray scale).Here, the comparison process of the expectation electric current I ref of the detection electric current I det of electric current comparing section 145 and x gray scale is relatively to judge to detect electric current I det whether also less than expectation electric current I ref (Idet＜Iref).
When detecting electric current I det also less than expectation electric current I ref_x, be applied to data line Ld as proofreading and correct grayscale voltage Vpix if when write activity, will detect voltage Vdet (p) with remaining unchanged, then since the influence of the threshold shift that the V-I characteristic line SPw2 of transistor Tr 12 and transistor Tr 13 causes might be lower than between drain electrode-source electrode of the electric current inflow transistor Tr13 that wants gray-scale displayed originally.
Therefore, when detecting electric current I det less than expectation electric current I ref_x, electric current comparing section 145 exports the comparison judged result (for example positive voltage signal) of the evaluation increase by 1 of the counter of bias voltage generating unit 143 in the counter of bias voltage generating unit 143.
If the evaluation of the counter of bias voltage generating unit 143 increases by 1, then bias voltage generating unit 143 adds 1 (step S118) with the value of bias set value Minc, and the bias set value Minc based on after the addition gets back to step S113 once more, generates Vofst (p+1).Therefore, Vofst (p+1) is the negative value that satisfies following formula (14).
Vofst(p+1)＝Vofst(p)+Vunit…(14)
Afterwards, repeat the following step of step S114, until in step S117, detecting electric current I det greater than till expecting electric current I ref_x.
In step S117, when detecting electric current I det greater than expectation electric current I ref_x, the comparison judged result (for example negative voltage signal) that the evaluation of the counter of bias voltage generating unit 143 is not increased exports the counter of bias voltage generating unit 143 to.
If above-mentioned relatively judged result (negative voltage signal) is put into counter, then bias voltage generating unit 143 is considered as detecting the threshold shift current potential that V-I characteristic line SPw2 that voltage Vdet (p) proofreaied and correct transistor Tr 12 and transistor Tr 13 causes, as the correction grayscale voltage Vpix that is applied to data line Ld, gray scale bias set value Minc is at this moment exported detection voltage Vdet (p) at this moment to shift register data register portion 141 as correction data.In shift register data register portion 141, the gray scale bias set value Minc that constitutes the correction data of each row is sent to frame memory 146, finish obtain (the step S119) of correction data.
And frame memory 146 exports the gray scale bias set value Minc that accumulates to bias voltage generating unit 143 carrying out correction data when obtaining in action and the write activity any one.
Then, after obtaining correction data at the capable display pixel PIX of above-mentioned i, for the display pixel PIX to next line (i+1 is capable) also carries out above-mentioned a series of processing action, increase the processing (i=i+1) (step S120) that is used to specify capable variable " i ".Here, judge that relatively whether the variable " i " be carried out after increment is handled is less than total line number n (i＜n) (the step S121) that sets on the display panel 110.
In the comparison of the capable variable of being used to specify of step S121, under the situation of judgment variable " i " less than line number n (i＜n), carry out processing once more from above-mentioned steps S112 to step S121, repeat same processing, until in step S121, judge till the variable " i " consistent with line number n (i=n).
In step S121, when judging variable " i " consistent with line number n (i=n), all row to display panel 110 carry out the correction data of each row display pixel PIX is obtained action, the correction data of each display pixel PIX is stored in respectively in the regulation storage area of frame memory 146, finishes above-mentioned a series of correction data and obtain action.
And during this correction data obtained action, the current potential of each terminal satisfied the relation of above-mentioned (3)～(10), did not therefore have electric current to flow in organic EL OLED, did not carry out luminous action.
Like this, obtain when action carrying out correction data, as shown in figure 12, mensuration will detect the detection electric current I det that flows through when voltage Vdet is applied to data line Ld, when electric current I ds_x is as expected value between the drain electrode-source electrode of transistor Tr 13 under with the x gray scale of the V-I characteristic line SPw correspondence of original state, be used to when setting write activity to flow through and the drain electrode-source electrode of the transistor Tr 13 that this expected value is approximate between the bias voltage Vofst of electric current I ds, the gray scale bias set value Minc under the bias voltage Vofst is stored in the frame memory 146 as correction data.
In a word, voltage adjustment part 144 will be corresponding to the bias voltage Vofst (p) of the negative potential of the gray scale bias set value Minc that comes self-bias voltage generating unit 143 with from the former grayscale voltage Vorg_x addition of the negative potential of the x gray scale of grayscale voltage generating unit 142 according to formula (13), generate and detect voltage Vdet (p), if when write activity with and the drain electrode-source electrode of the expected value of transistor Tr 13 between the approximate mode correct detection voltage Vdet (p) of electric current I ds_x, the mode of handling as the correction grayscale voltage Vpix that is applied to data line Ld with the current potential that will detect voltage Vdet (p) then, the gray scale bias set value Minc that will detect voltage Vdet (p) is stored in the frame memory 146.
In addition, for foregoing, although grayscale voltage generating unit 142 generates former grayscale voltage Vorg_x based on each the video data of each the display pixel PIX that provides from shows signal generative circuit 160, but also can set for and make the former grayscale voltage Vorg_x that adjusts usefulness is fixed value, do not provide video data from shows signal generative circuit 160, this adjusts the mode of the former grayscale voltage Vorg_x of usefulness by 142 outputs of grayscale voltage generating unit.As previously mentioned, the adjustment of preferred this moment is to make that expectation electric current I ref_x is being that organic EL OLED is with the luminous such electric current of maximum brightness gray scale (near the perhaps gray scale it) during the luminous action with the current potential of former grayscale voltage Vorg_x.
And, in the above-described embodiment, display device 100 is that electric current I ds flows into the electric current introducing type display device of data drivers 140 from showing transistor Tr 13 between the drain electrode-source electrode of transistor Tr 13, therefore unit voltage Vunit is a negative value, but if electric current I ds is pressed into the type display device from data driver towards the electric current that the transistor that is connected in series with organic EL OLED flows between this transistor drain-source electrode, then unit voltage Vunit be on the occasion of.
(display driver action)
Then the display driver action to the display device of present embodiment describes.
Figure 13 is the timing diagram of an example of display driver action of the display device of expression present embodiment.
Here, for the convenience that illustrates, what illustrate is among the display pixel PIX of rectangular configuration on display panel 110, make the capable j of i row and (i+1) timing diagram when go luminous action of display pixel PIX of j row (i is the positive integer of 1≤i≤n, and j is the positive integer of 1≤j≤m) with the brightness corresponding with video data.
And Figure 14 is the process flow diagram of an example of write activity of the display device of expression present embodiment.
Figure 15 is the concept map of write activity of the display device of expression present embodiment.
Figure 16 is the concept map that the maintenance of the display device of expression present embodiment is moved.
Figure 17 is the concept map of luminous action of the display device of expression present embodiment.
The display driver action of the display device 100 of present embodiment, identical with the driving method of above-mentioned pixel-driving circuit DCx, for example as shown in figure 13, during the display driver of regulation in (during 1 cycle of treatment) Tcyc, set for and carry out following action at least: write activity (Twrt during the write activity), to be kept at that above-mentioned correction data in the frame memory 146 is set at bias set value Minc and each the pairing former grayscale voltage Vorg of the video data addition of bias voltage Vofst that generates and each the display pixel PIX that provides from shows signal generative circuit 160, generate and proofread and correct grayscale voltage Vpix, provide to each display pixel PIX by each data line Ld; Keep action (keep action during Thld), write by this write activity between the gate-to-source of the transistor Tr 13 that is provided with among the pixel-driving circuit DC of display pixel PIX and the pairing voltage composition of setting of correction grayscale voltage Vpix to capacitor C s charging and keep this voltage composition; Luminous action (Tem during the luminous action), based on the voltage composition that remains on by this maintenance action among the capacitor C s, make the light emission drive current Iem that has with the current value of video data correspondence flow into organic EL OLED, make the luminous (Tcyc 〉=Twrt+Thld+Tem) of its brightness with regulation.
Here, be configured to during 1 cycle of treatment that Tcyc adopts during the display driver of present embodiment, for example, during display pixel PIX shows that the image information of 1 pixel in 1 two field picture is needed.In other words, on line direction and column direction in the display panel 110 of a plurality of display pixel PIX of arranged, when showing 1 two field picture, during Tcyc is configured to 1 row display pixel PIX and shows that the row of 1 in 1 two field picture image is needed during above-mentioned 1 cycle of treatment.
(write activity)
In write activity (Twrt during the write activity), as shown in figure 13, at first, for the power voltage line Lv that is connected with the capable display pixel PIX of i, identical with the write activity of above-mentioned pixel-driving circuit DCx, (=Vccw≤Vss: under the state the 1st voltage), will select the selection signal Ssel of level (high level) to be applied to the capable selection wire Ls of i, the display pixel pix setup that i is capable is at selection mode in the power source voltage Vcc that applies write activity level (0V or negative voltage).Therefore, transistor Tr 11 that is provided with among the pixel-driving circuit DC (maintenance transistor) and transistor Tr 12 conductings, transistor Tr 13 (driving transistors) is set to the diode connection status, power source voltage Vcc is applied to the drain terminal and the gate terminal of transistor Tr 13, and this source terminal is connected with data line Ld.
At one time, will be applied to data line Ld with the correction grayscale voltage Vpix of video data correspondence.Here, proofreading and correct grey scale signal Vpix is based on a series of processing actions (grayscale voltage corrective action) for example shown in Figure 14 and generates.
In other words, as shown in figure 14, at first, obtaining from the video data that is provided by shows signal generative circuit 160 becomes the brightness value of the display pixel of write activity object PIX (step S211), judges whether this brightness value is " 0 " (step S212).Judge in the action at the gray-scale value of step S212, when the brightness value is " 0 ", from grayscale voltage generating unit 142 output be used to not have luminous action grayscale voltage (black voltage) Vzero of regulation of (perhaps black display action), not in voltage adjustment part 144 with bias voltage Vofst addition (promptly not carrying out compensation deals) for the threshold voltage variation of transistor Tr 13, be applied to data line Ld (step S213) with remaining unchanged.Here, be used to not have the magnitude of voltage that the grayscale voltage Vzero of luminous action is configured to have following relation, promptly have the voltage Vgs (≈ Vccw-Vzero) that applies between the gate-to-source of the transistor Tr 13 that diode connects than the low relation of the threshold voltage vt h of this transistor Tr 13 (magnitude of voltage of Vgs＜Vth) (Vzero＜Vth-Vccw).Here, in order to suppress the threshold shift of transistor Tr 12, transistor Tr 13, preferred Vzero=Vccw.
In step S212, when the brightness value is not " 0 ", generate by grayscale voltage generating unit 142 and to have and the former grayscale voltage Vorg and the output (the 2nd step) of this brightness value (video data) corresponding voltage value, and from frame memory 146, read correction data (step S214) with each display pixel PIX corresponding stored of this row successively by shift register data register portion 141, export each column data line Ld to and go up the bias voltage generating unit 143 that is provided with, with this correction data as bias set value Minc, Vunit multiplies each other with unit voltage, generates the bias voltage Vofst corresponding with the threshold voltage variation amount of the transistor Tr 13 of each display pixel PIX (pixel-driving circuit DC) ((the step S215 of=Vunit * Minc); The 3rd step).
Then, as shown in figure 15, in voltage adjustment part 144, will be according to formula (12) from the former grayscale voltage Vorg of the negative potential of above-mentioned grayscale voltage generating unit 142 outputs with from the bias voltage Vofst addition of the negative potential of bias voltage generating unit 143 outputs, generate the correction grayscale voltage Vpix (step S216) of negative potential, be applied to data line Ld (step S217) afterwards.Here, the correction grayscale voltage Vpix that generates in voltage adjustment part 144 is configured to, will from power supply driver 130 be applied to the write activity level (electronegative potential) of power voltage line Lv power source voltage Vcc (=Vccw) as benchmark, have the voltage amplitude of relative negative potential.Proofread and correct grayscale voltage Vpix and reduce (the absolute value increase of voltage amplitude) along with the raising of gray scale in the negative potential side.
Thereby, because the correction grayscale voltage Vpix that will be corrected with the variation pairing bias voltage Vofst addition of the threshold voltage vt h of this transistor Tr 13 is applied to the source terminal (contact N12) of transistor Tr 13, so the voltage Vgs after proofreading and correct is written into (two ends of capacitor C s) (the 4th step) between the gate-to-source of transistor Tr 13.In such write activity, gate terminal and source terminal for transistor Tr 13, not to flow through the electric current corresponding and the setting voltage composition, but directly apply the voltage of expectation, so the state that can apace the potential setting of each terminal or contact expected with video data.
And, Twrt during write activity, the magnitude of voltage of correction grayscale voltage Vpix of contact N12 that is applied to the anode terminal side of organic EL OLED is set to, lower (in other words than the reference voltage V ss that is applied to cathode terminal TMc, organic EL OLED is set at reverse-bias state), so do not flow through electric current among the organic EL OLED, do not carry out luminous action.
(keeping action)
Then, in the maintenance action after Twrt finishes during above-mentioned write activity (Thld during keeping moving), as shown in figure 13, be applied to the capable selection wire Ls of i by selection signal Ssel with non-selection level (low level), as shown in figure 16, transistor Tr 11 and transistor Tr 12 conductings, the diode connection status of transistor Tr 13 is removed, and the correction grayscale voltage Vpix that is applied to the source terminal (contact N12) of transistor Tr 13 disconnects, be applied to voltage composition between the gate-to-source of transistor Tr 13 (| Vpix-Vccw|) to capacitor C s charging and be held.
And, at this regularly, because from selecting driver 120 will select the selection signal Ssel of level (high level) to be applied to the selection wire Ls that (i+1) goes, so in the display pixel PIX of (i+1) row, identical with above-mentioned situation, write the write activity of proofreading and correct grayscale voltage Vpix.Like this, Thld during the maintenance of the capable display pixel PIX of i action proceeds to keep action, till the display pixel PIX to other row writes voltage composition (proofreading and correct grayscale voltage Vpix) with the video data correspondence successively.
(luminous action)
Then, the luminous action (Tem during the luminous action after Thld finishes at Twrt during the write activity with during keeping moving; The 5th step) in, as shown in figure 13, be applied at selection signal Ssel under the state of each selection wire Ls that goes, with noble potential (positive voltage) supply voltage (the 2nd voltage) the Vcc (=Vcce＞0V: the 2nd voltage) be applied to the power voltage line Lv that is connected with each row display pixel PIX of luminous keying level non-selection level (low level).
Here, identical with Fig. 7, situation shown in Figure 8, be applied to power voltage line Lv the high potential power voltage vcc (=Vcce) be configured to saturation voltage (pinch-off voltage Vpo) greater than transistor Tr 13, with driving voltage (Voled) sum of organic EL OLED, so transistor Tr 13 is moved in the zone of saturation.And, anode-side (contact N12) at organic EL OLED, apply by above-mentioned write activity write between the gate-to-drain of transistor Tr 13 and the voltage composition of setting (| Vpix-Vccw|) pairing positive voltage, on the other hand, on cathode terminal TMc, apply reference voltage V ss (for example earthing potential), thereby organic EL OLED is set in the forward bias state, so as shown in figure 17, make and have and video data (is grayscale voltage after proofreading and correct strictly speaking; Correction grayscale voltage Vpix) the light emission drive current Iem (electric current I ds between the gate-to-drain of transistor Tr 13) of corresponding current value flows into organic EL OLED by transistor Tr 13 from power voltage line Lv, makes its brightness with regulation carry out luminous action.
Proceed this luminous action, from power supply driver 130 apply write activity level (negative voltage) power source voltage Vcc (=Vccw), up to the beginning next display driver cycle (1 cycle of treatment cycle) Tcyc time till.
Utilize this a series of display drivers action, as shown in figure 13, each the row display pixel PIX that arranges on to display panel 110 applies the power source voltage Vcc of write activity level (under=Vccw) the state, write in each each row of going proofreading and correct grayscale voltage Vpix, the voltage composition that keeps successively stipulating (| action Vpix-Vccw|), to this write activity and keep release the display pixel PIX of row apply luminous keying level power source voltage Vcc (=Vcce), thereby can make the display pixel PIX of this row carry out luminous action.
And, after the write activity of the display pixel PIX of all row in following, each group for example finishes, when making all interior display pixel PIX of this group carry out luminous action simultaneously, above-mentioned maintenance moved be arranged between write activity and the luminous action.At this moment, the length difference of the maintenance action cycle Thld of each row.And, do not carrying out under the situation of such drive controlling, also can not keep action.
Here, in the display device 100 of present embodiment, as shown in Figure 9, because the display pixel PIX that arranges on the display panel 110 is grouped in 2 groups that are made of the upper area of display panel 110 and lower zone, each power voltage line Lv by branch is applied to each group with power source voltage Vcc, so can make the multirow display pixel PIX that comprises in each group carry out luminous action simultaneously.Below, the concrete drive controlling action of this moment is described.
Figure 18 is the action timing diagram of object lesson of driving method that schematically shows the display device of present embodiment.
And in Figure 18, for the convenience that illustrates, what illustrate is to arrange 12 row (n=12 on display panel; The 1st row～the 12 row) display pixel, with the display pixel of the 1st～6 row (corresponding) and the 7th～12 row (corresponding) with above-mentioned lower zone with above-mentioned upper area respectively as one group, thereby be divided into the action timing diagram of 2 groups of situations.
As shown in figure 18, the drive controlling action that possesses the display device 100 of display panel shown in Figure 9 110 is, for all display pixel PIX that are arranged on the display panel 110, in predetermined timing each each row of going is carried out above-mentioned correction data successively and obtain action, after the correction data that all row to display panel 110 carry out obtains release (being after correction data obtains action cycle Tdet end), in 1 frame period Tfr, the element characteristic that display pixel PIX (pixel-driving circuit DC) of each row of each row of display panel 110 is write the driving transistors (transistor Tr 13) of the former grayscale voltage Vorg of video data correspondence and each display pixel PIX changes the correction grayscale voltage Vpix that pairing bias voltage Vofst addition obtains, the voltage composition that all row are repeated to keep to stipulate successively (| action Vpix-Vccw|), and the timing that the above-mentioned write activity that carries out at the 1st～6 row or the 7th～12 display pixel PIX (organic EL OLED) that goes to grouping in advance finishes, repeat to make the whole display pixel PIX that are included in this group to carry out the display driver action (display driver period T cyc shown in Figure 13) of luminous action simultaneously, thereby show the image information of 110 1 pictures of display panel with the brightness corresponding with video data (proofreading and correct grayscale voltage Vpix).
Particularly, for the above-mentioned display pixel PIX that is arranged on the display panel 110, in the group that the display pixel PIX by the 1st～6 row and the 7th～12 row constitutes, by the power voltage line Lv that is connected jointly with display pixel PIX with the power source voltage Vcc of electronegative potential (=Vccw) be applied under state of each group, display pixel PIX since the 1st row, carry out above-mentioned correction data successively and obtain action (correction data obtain action during Tdet), for all display pixel PIX that are arranged on the display panel 110, to go up the corresponding correction data of threshold voltage variation of the transistor Tr 13 (driving transistors) that is provided with pixel-driving circuit DC, for each display pixel PIX each, store (storage) respectively in the regulation zone of frame memory 146.
Then, after Tdet finishes during above-mentioned correction data obtains action, in the group that the display pixel PIX by the 1st～6 row constitutes, by applying the power source voltage Vcc of electronegative potential (under=Vccw) the state with the power voltage line Lv that the display pixel PIX of this group is connected jointly, display pixel PIX since the 1st row, carry out above-mentioned write activity (Twrt during the write activity) successively and keep action (Thld during keeping moving), the timing that the write activity that carries out at the display pixel PIX to the 6th row finishes, switch, make by the power voltage line Lv of this group apply noble potential power source voltage Vcc (=Vcce), thereby, make 6 row display pixel PIX of this group carry out luminous action simultaneously with brightness based on the video data that writes each display pixel PIX (proofreading and correct grayscale voltage Vpix).This luminous action is proceeded, and begins to carry out up to the display pixel PIX to the 1st row (Tem during the luminous action of the 1st～6 row) till the timing of next write activity.
And, the timing that the write activity that carries out at the display pixel PIX to above-mentioned the 1st～6 row finishes, in the group that the display pixel PIX by the 7th～12 row constitutes, by with the power voltage line Lv that the display pixel PIX of this group is connected jointly apply electronegative potential power source voltage Vcc (=Vccw), display pixel PIX since the 7th row, carry out above-mentioned write activity (Twrt during the write activity) successively and keep action (Thld during keeping moving), the timing that the write activity that carries out at the display pixel PIX to the 12nd row finishes, switch, make by the power voltage line Lv of this group apply noble potential power source voltage Vcc (=Vcce), thereby, make 6 row display pixel PIX of this group carry out luminous action (Tem during the luminous action of the 7th～12 row) simultaneously with brightness based on the video data that writes each display pixel PIX (proofreading and correct grayscale voltage Vpix).During the display pixel PIX to the 7th～12 row carries out write activity and keeps action, as mentioned above, by power voltage line Lv to the display pixel PIX of the 1st～6 row apply noble potential power source voltage Vcc (=Vcce), proceed luminous simultaneously action.
Like this, carrying out after correction data obtains action being arranged in whole display pixel PIX on the display panel 110, carry out write activity successively and keep action at predetermined timing each row each row display pixel PIX, for predefined each group, the timing that the write activity that the display pixel PIX of all row that comprise in to this group carries out finishes, carry out drive controlling, make whole display pixel PIX of this group carry out luminous action simultaneously.
Therefore, utilize such display-apparatus driving method (display driver action), in 1 image duration Tfr, each row display pixel in to same group carries out during the write activity, can not carry out the luminous action of the whole display pixels (light-emitting component) in this group, be set at no luminance (black show state).Here, in action timing diagram shown in Figure 180, the 12 row display pixel PIX that constitute display panel 110 are divided into 2 groups, control, make each group carry out luminous action simultaneously, so the ratio (black insertion rate) during the black demonstration of the above-mentioned no luminous action of 1 frame period Trf can be set at 50% in different timings.Here, in order not blur visually having of the mankind and to watch dynamic image brightly, in general target is to have about black insertion rate more than 30%, so utilize this driving method, can realize having the display device of display quality preferably.
And, in present embodiment (Fig. 9), what illustrate is that each continuous row that will be arranged in a plurality of display pixel PIX on the display panel 110 is divided under 2 groups the situation, but the present invention is not limited thereto, also can be divided into group numbers arbitrarily such as 3 groups, 4 groups, and, can also as even number line and odd-numbered line, discontinuous row be divided in groups mutually.Therefore, can set luminous timing arbitrarily and during black the demonstration (black show state), can realize the improvement of display quality according to the group number of grouping.
And, can also not a plurality of display pixel PIX groupings that will be arranged in like that as mentioned above on the display panel 110, but by (connection) power voltage line being set respectively at each row, independently apply power source voltage Vcc in different timings, thereby exercise display pixel PIX at each and carry out luminous action, can also make whole display pixels of a picture on the display panel 110 carry out luminous action simultaneously by the whole display pixel PIX that are arranged in a picture on the display panel 110 are applied public power source voltage Vcc simultaneously.
As mentioned above, the display device of present embodiment and driving method thereof, can adopt the gray scale method of voltage appointment type (perhaps voltage applies type), promptly by during the write activity of video data, between the gate-to-source of driving transistors (transistor Tr 13), directly apply the correction grayscale voltage Vpix of variation corresponding voltage value of the element characteristic (threshold voltage) of appointment and video data and driving transistors, the voltage composition of regulation is remained in the electric capacity (capacitor C s), based on this voltage composition, control flows into the light emission drive current Iem of light-emitting component (organic EL OLED), makes its brightness with expectation luminous.
Therefore, with the electric current corresponding with video data is provided, carrying out the electric current appointment type gray scale method of write activity (keeping the voltage composition corresponding with video data) compares, even maximize and high situation about becoming more meticulous at display panel, or hang down the situation that gray scale shows, grey scale signal (correction grayscale voltage) that also can rapidly and reliably will be corresponding with video data writes each display pixel, write not enough generation so can suppress video data, carry out luminous action with the appropriate brightness gray scale corresponding, can realize superior display quality with video data.
And, at the write activity that display pixel (pixel-driving circuit) is carried out by video data, before the display driver that keeps action and luminous action to constitute moves, obtain with each display pixel in the corresponding correction data of threshold voltage variation of the driving transistors that is provided with, and when carrying out write activity, can generate and apply grey scale signal (correction grayscale voltage) after the correction of each display pixel based on this correction data, so can compensate the influence (displacement of the voltage-current characteristic of driving transistors) that above-mentioned variations in threshold voltage is brought, make each display pixel (light-emitting component) luminous with the appropriate brightness gray scale corresponding with video data, can suppress the deviation of the characteristics of luminescence of each display pixel, improve display quality.
Claims (57)
1. a display drive apparatus drives the display pixel that possesses light-emitting component and driving element, it is characterized in that possessing:
The particular value testing circuit in the time will being applied on the above-mentioned display pixel based on the detection voltage of the unit voltage of stipulating, according to the current value of the electric current stream that flows through above-mentioned driving element, detects the particular value corresponding with the element characteristic of above-mentioned driving element;
The grayscale voltage correcting circuit, according to bucking voltage based on above-mentioned particular value and above-mentioned unit voltage, grayscale voltage is proofreaied and correct, generate and proofread and correct grayscale voltage, and offer above-mentioned display pixel, wherein, above-mentioned grayscale voltage has and is used to make above-mentioned light-emitting component to carry out the magnitude of voltage of luminous action with the brightness corresponding with video data.
2. display drive apparatus according to claim 1 is characterized in that also possessing:
Memory circuit will be stored as correction data by the above-mentioned particular value that above-mentioned particular value testing circuit detects.
3. display drive apparatus according to claim 2 is characterized in that:
Above-mentioned grayscale voltage correcting circuit is read above-mentioned correction data from above-mentioned memory circuit, generates above-mentioned correction grayscale voltage according to the above-mentioned correction data of reading.
4. display drive apparatus according to claim 3 is characterized in that also possessing:
The grayscale voltage generative circuit generates above-mentioned grayscale voltage, and above-mentioned grayscale voltage has and is used to make above-mentioned light-emitting component with the luminous magnitude of voltage of the brightness corresponding with video data;
The bucking voltage generative circuit according to the pairing particular value of reading from above-mentioned memory circuit of above-mentioned correction data, generates the above-mentioned bucking voltage of the said elements characteristic of the above-mentioned driving element of compensation;
Above-mentioned bucking voltage generative circuit above-mentioned particular value and above-mentioned unit voltage are multiplied each other and the voltage composition that generates as above-mentioned bucking voltage;
Above-mentioned grayscale voltage correcting circuit, the value that above-mentioned bucking voltage that will be generated by above-mentioned bucking voltage generative circuit and the above-mentioned grayscale voltage addition that is generated by above-mentioned grayscale voltage generative circuit obtain is as above-mentioned correction grayscale voltage.
5. display drive apparatus according to claim 2 is characterized in that, above-mentioned particular value testing circuit possesses:
Current comparison circuit detects the current value of the electric current of the above-mentioned electric current stream flow through above-mentioned driving element when above-mentioned detection voltage is applied to above-mentioned display pixel, and the expectation current value of detected current value and regulation is compared;
The bias voltage initialization circuit, read above-mentioned correction data from above-mentioned memory circuit, generation is based on the pairing bias set value of reading of above-mentioned correction data and the bias voltage of above-mentioned unit voltage, and according to the above-mentioned comparative result of above-mentioned current comparison circuit, change the processing of above-mentioned bias set value, generate based on the bias set value after changing and the above-mentioned bias voltage of above-mentioned unit voltage value;
Detect voltage setting circuit, the magnitude of voltage of above-mentioned detection voltage is set at value based on above-mentioned bias voltage value;
Particular value extracts circuit, and the above-mentioned comparative result according to above-mentioned current comparison circuit extracts above-mentioned bias set value, as above-mentioned particular value.
6. display drive apparatus according to claim 5 is characterized in that:
Above-mentioned particular value extracts circuit, at above-mentioned comparative result according to above-mentioned current comparison circuit, judge that the current value of above-mentioned detection and above-mentioned expectation current value equate or during greater than above-mentioned expectation current value, extract above-mentioned bias set value, as above-mentioned particular value.
7. display drive apparatus according to claim 5 is characterized in that:
Above-mentioned bias voltage initialization circuit, in the above-mentioned comparison of above-mentioned current comparison circuit, the current value of judging above-mentioned detection is during less than above-mentioned expectation current value, the value of above-mentioned bias set value is changed to value after the increment, this bias set value and above-mentioned unit voltage voltage composition that obtains that multiplies each other after changing is set at above-mentioned bias voltage.
8. display drive apparatus according to claim 7 is characterized in that:
Above-mentioned detection voltage setting circuit is set at the magnitude of voltage of above-mentioned detection voltage, with multiply each other value after the initial value addition of the voltage composition that obtains and this detection voltage of above-mentioned bias set value and above-mentioned unit voltage.
9. display drive apparatus according to claim 8 is characterized in that:
The initial value of the above-mentioned detection voltage of above-mentioned detection voltage setting circuit is to be used to make above-mentioned light-emitting component to carry out the magnitude of voltage of the above-mentioned grayscale voltage of luminous action with the 1st specific gray scale;
Above-mentioned unit voltage is and above-mentioned the 1st gray scale of above-mentioned grayscale voltage and than the pairing voltage of potential difference (PD) between the 2nd gray scale of low 1 gray scale of this specific gray scale;
Above-mentioned expectation current value is, when above-mentioned driving element is kept under the state of initial characteristic above-mentioned grayscale voltage with above-mentioned the 2nd gray scale and is applied to above-mentioned display pixel, with the pairing value of current value of the above-mentioned electric current stream that flows through above-mentioned driving element.
10. display drive apparatus according to claim 9 is characterized in that:
Above-mentioned the 1st gray scale is the highest gray scale that above-mentioned light-emitting component is set.
11. a display device shows and the video data corresponding image information, it is characterized in that possessing:
Display panel, near each intersection point of many selection wires that are configured in line direction and column direction and data line, be arranged with a plurality of display pixels, this display pixel comprises light-emitting component and the electric current that flows in the electric current stream is offered the driving element of above-mentioned light-emitting component;
Select drive division, will select signal to be applied to successively among each bar in above-mentioned many selection wires in predetermined timing, and above-mentioned display pixel that each is capable is set at selection mode successively;
Data-driven portion generates the grey scale signal corresponding to above-mentioned video data, and offers above-mentioned each display pixel of the row that is set at above-mentioned selection mode by above-mentioned each data line;
Above-mentioned data-driven portion possesses at least:
The particular value testing circuit, passing through above-mentioned each data line, in the time of will being applied to above-mentioned each display pixel based on the detection voltage of unit voltage of regulation, according to the current value of the electric current stream of the above-mentioned driving element that flows through above-mentioned each display pixel, detect the corresponding particular value of element characteristic with each above-mentioned driving element of above-mentioned a plurality of display pixels;
The grayscale voltage correcting circuit, according to grayscale voltage being proofreaied and correct based on the bucking voltage of above-mentioned particular value and above-mentioned unit voltage, generate and proofread and correct grayscale voltage, and by above-mentioned each data line, offer above-mentioned display pixel, as above-mentioned grey scale signal, wherein, above-mentioned grayscale voltage has and is used to make above-mentioned light-emitting component to carry out the magnitude of voltage of luminous action with the brightness corresponding with above-mentioned video data.
12. display device according to claim 11 is characterized in that:
Above-mentioned particular value testing circuit detects above-mentioned particular value at the whole display pixels in above-mentioned a plurality of display pixels;
Above-mentioned display device also possesses memory circuit, and this memory circuit is stored detected above-mentioned particular value, as correction data corresponding to each display pixel in above-mentioned a plurality of display pixels.
13. display device according to claim 12 is characterized in that:
Above-mentioned grayscale voltage correcting circuit is read the above-mentioned correction data corresponding with each above-mentioned display pixel of the row that is set at above-mentioned selection mode from above-mentioned memory circuit, generates above-mentioned correction grayscale voltage according to the above-mentioned correction data of reading.
14. display device according to claim 13 is characterized in that, also possesses:
The grayscale voltage generative circuit generates above-mentioned grayscale voltage, and above-mentioned grayscale voltage has and is used to make above-mentioned light-emitting component with the luminous magnitude of voltage of the brightness corresponding with video data;
The bucking voltage generative circuit according to the particular value of reading from above-mentioned memory circuit corresponding with above-mentioned correction data, generates the above-mentioned bucking voltage of the said elements characteristic of the above-mentioned driving element of compensation;
Above-mentioned bucking voltage generative circuit, above-mentioned particular value corresponding with above-mentioned correction data that will read from above-mentioned memory circuit and above-mentioned unit voltage multiply each other and the voltage composition that generates, as above-mentioned bucking voltage;
Above-mentioned grayscale voltage correcting circuit, the value that above-mentioned bucking voltage that will be generated by above-mentioned bucking voltage generative circuit and the above-mentioned grayscale voltage addition that is generated by above-mentioned grayscale voltage generative circuit obtain is as above-mentioned correction grayscale voltage.
15. display device according to claim 12 is characterized in that, above-mentioned particular value testing circuit possesses:
Current comparison circuit, the current value of the electric current that detection is flowed when above-mentioned detection voltage being applied to above-mentioned each display pixel by above-mentioned data line, in the above-mentioned electric current stream of the above-mentioned driving element of above-mentioned each display pixel, and the expectation current value of detected current value and regulation compared;
The bias voltage initialization circuit, read above-mentioned correction data from above-mentioned memory circuit, each of the above-mentioned display pixel of above-mentioned correction data and the row that is set at above-mentioned selection mode by above-mentioned memory circuit is corresponding, generation is based on the pairing bias set value of reading of above-mentioned correction data and the bias voltage of above-mentioned unit voltage, and according to the above-mentioned comparative result of above-mentioned current comparison circuit, change the processing of the value of above-mentioned bias set value, generate based on the bias set value after this change and the bias voltage of above-mentioned unit voltage value;
Detect voltage setting circuit, the magnitude of voltage of above-mentioned detection voltage is set at value based on above-mentioned bias voltage value;
Particular value extracts circuit, according to the comparative result of above-mentioned current comparison circuit, extracts above-mentioned bias set value, as above-mentioned particular value.
16. display device according to claim 15 is characterized in that:
Above-mentioned particular value extracts circuit, according to the above-mentioned comparison of above-mentioned current comparison circuit, judges that above-mentioned detected current value and above-mentioned expectation current value equate or during greater than above-mentioned expectation current value, extracts above-mentioned bias set value, as above-mentioned particular value.
17. display device according to claim 15 is characterized in that:
Above-mentioned bias voltage initialization circuit, in the above-mentioned comparison of above-mentioned current comparison circuit, when judging above-mentioned detected current value less than above-mentioned expectation current value, the value of above-mentioned bias set value is updated to value after increasing, the unit voltage of bias set value after this renewal and the regulation voltage composition that obtains that multiplies each other is set at above-mentioned bias voltage.
18. display device according to claim 17 is characterized in that:
Above-mentioned detection voltage setting circuit is set at the magnitude of voltage of above-mentioned detection voltage, with multiply each other value after the initial value addition of the voltage composition that obtains and this detection voltage of above-mentioned bias set value and above-mentioned unit voltage.
19. display device according to claim 18 is characterized in that:
The initial value of the above-mentioned detection voltage of above-mentioned detection voltage setting circuit is to be used to make above-mentioned light-emitting component to carry out the magnitude of voltage of the above-mentioned grayscale voltage of luminous action with the 1st specific gray scale;
Above-mentioned unit voltage is the pairing voltage of potential difference (PD) between above-mentioned the 1st gray scale of above-mentioned grayscale voltage and the 2nd gray scale of hanging down 1 gray scale than this specific gray scale;
Above-mentioned expectation current value is, when above-mentioned driving element is kept under the state of initial characteristic above-mentioned grayscale voltage with above-mentioned the 2nd gray scale and is applied to above-mentioned display pixel, flows through the pairing value of current value of the above-mentioned electric current stream of above-mentioned driving element.
20. display device according to claim 19 is characterized in that:
Above-mentioned the 1st gray scale is the highest gray scale that above-mentioned light-emitting component is set.
21. display device according to claim 11 is characterized in that:
Above-mentioned light-emitting component is an organic electroluminescent device.
22. display device according to claim 11 is characterized in that:
Above-mentioned each display pixel possesses pixel-driving circuit at least, and above-mentioned pixel-driving circuit has:
The 1st on-off element is applied in supply voltage at an end of electric current stream, and the other end of this electric current stream connects with the contact that is connected of above-mentioned light-emitting component, and and above-mentioned data line be electrically connected, form above-mentioned driving element;
The 2nd on-off element, an end of electric current stream is applied in above-mentioned supply voltage, and the control terminal of the other end of this electric current stream and above-mentioned the 1st on-off element is connected; And
The voltage holding element is connected between the above-mentioned control terminal and above-mentioned connection contact of above-mentioned the 1st on-off element;
The power drives of the above-mentioned supply voltage portion that provides is provided above-mentioned display device,
This power drives portion, during during detecting above-mentioned particular value and by above-mentioned grayscale voltage correcting circuit, providing above-mentioned each display pixel with above-mentioned correction grayscale voltage by above-mentioned particular value testing circuit, above-mentioned supply voltage is set at the 1st voltage that makes above-mentioned light-emitting component be non-luminance, above-mentioned light-emitting component is set at non-luminance
After this regularly, above-mentioned supply voltage is set at above-mentioned the 2nd voltage that makes above-mentioned light-emitting component be luminance, above-mentioned light-emitting component is set at luminance.
23. display device according to claim 22 is characterized in that:
The the above-mentioned the 1st and the 2nd on-off element is the field effect transistor that possesses the semiconductor layer that is made of amorphous silicon.
24. display device according to claim 22 is characterized in that:
Above-mentioned display pixel also possesses the 3rd on-off element, and an end of its electric current stream is connected with above-mentioned data line, and the other end of electric current stream connects with the above-mentioned contact that is connected.
25. display device according to claim 24 is characterized in that:
Above-mentioned the 3rd on-off element is the field effect transistor that possesses the semiconductor layer that is made of amorphous silicon.
26. the display device above-mentioned according to claim 22 is characterized in that:
Above-mentioned a plurality of display pixel is divided into a plurality of groups that have multirow respectively,
Above-mentioned power drives portion, timing behind the above-mentioned multirow display pixel of each group that above-mentioned correction grayscale voltage is offered above-mentioned each group, the above-mentioned supply voltage of electric current stream one end of above-mentioned the 1st on-off element of above-mentioned multirow display pixel that is applied to each group of this each group is set at above-mentioned the 2nd voltage, the above-mentioned multirow display pixel of each group of each group is set at luminance simultaneously.
27. display device according to claim 22 is characterized in that, also possesses:
The connection status control part is controlled the conducting state of the above-mentioned electric current stream of above-mentioned the 2nd on-off element,
This connection status control part is controlled by this way, promptly, when providing above-mentioned the 1st voltage by above-mentioned power drives portion and above-mentioned light-emitting component be set at non-luminance, make the above-mentioned electric current stream conducting of above-mentioned the 2nd on-off element, an end of the above-mentioned electric current stream of above-mentioned the 1st on-off element is connected with control terminal;
When providing above-mentioned the 2nd voltage by above-mentioned power drives portion and above-mentioned light-emitting component be set at luminance, make the above-mentioned electric current stream of above-mentioned the 2nd on-off element non-conduction, remove being connected of control terminal of the end of above-mentioned electric current stream of above-mentioned the 1st on-off element and the 1st on-off element.
28. a display device shows and the video data corresponding image information, it is characterized in that possessing:
Display panel, above-mentioned display panel is arranged with a plurality of display pixels, and above-mentioned display pixel has the pixel-driving circuit of the luminance of light-emitting component and this light-emitting component of control, and above-mentioned pixel-driving circuit has at least:
The 1st on-off element has control terminal and electric current stream, and an end of above-mentioned electric current stream is applied in supply voltage, and the other end connects with the contact that is connected of above-mentioned light-emitting component, and is applied in the signal voltage based on above-mentioned video data;
The 2nd on-off element has control terminal and electric current stream, and an end of above-mentioned electric current stream is applied in above-mentioned supply voltage, and the other end is connected with the above-mentioned control terminal of above-mentioned the 1st on-off element;
The voltage holding element is connected between the above-mentioned control terminal and above-mentioned connection contact of above-mentioned the 1st on-off element;
Above-mentioned supply voltage is set to have the 1st voltage and having that makes above-mentioned light-emitting component be the magnitude of voltage of non-luminance and makes above-mentioned light-emitting component be in the 2nd voltage of magnitude of voltage of luminance any one.
29. display device according to claim 28 is characterized in that:
In the above-mentioned display panel, above-mentioned a plurality of display pixels are arranged near each intersection point of many selection wires being disposed at line direction and column direction and data line;
Above-mentioned display device possesses:
Select drive division, will select signal to be applied to each bar in above-mentioned many selection wires successively in predetermined timing, above-mentioned display pixel that each is capable is set at selection mode successively;
Data-driven portion generates and the grey scale signal of above-mentioned video data correspondence, offers above-mentioned each display pixel of the row that is set at above-mentioned selection mode by above-mentioned each data line;
Power drives portion provides above-mentioned supply voltage;
The other end of the above-mentioned electric current stream of above-mentioned the 1st on-off element is electrically connected with above-mentioned data line.
30. display device according to claim 29 is characterized in that:
Above-mentioned display pixel also possesses the 3rd on-off element, and an end of its electric current stream is connected with above-mentioned data line, and the other end of this electric current stream connects with the above-mentioned contact that is connected.
31. display device according to claim 28 is characterized in that:
Also possess the connection status control part, control the conducting state of the above-mentioned electric current stream of above-mentioned the 2nd on-off element,
This connection status control part is controlled by this way, promptly, when providing above-mentioned the 1st voltage by above-mentioned power drives portion and above-mentioned light-emitting component be set at non-luminance, make the above-mentioned electric current stream conducting of above-mentioned the 2nd on-off element, an end of the above-mentioned electric current stream of above-mentioned the 1st on-off element is connected with control terminal;
When providing above-mentioned the 2nd voltage by above-mentioned power drives portion and above-mentioned light-emitting component be set at luminance, make the above-mentioned electric current stream of above-mentioned the 2nd on-off element non-conduction, the end of above-mentioned electric current stream of above-mentioned the 1st on-off element and the control terminal electricity of the 1st on-off element are disconnected.
32. the driving method of a display drive apparatus drives the display pixel with light-emitting component and driving element, it is characterized in that:
To be applied to above-mentioned display pixel based on the detection voltage of the unit voltage of stipulating;
Based on the current value of the electric current stream that flows through above-mentioned driving element, detect the particular value corresponding with the element characteristic of above-mentioned driving element,
Generate grayscale voltage, described grayscale voltage has and is used to the magnitude of voltage that makes above-mentioned light-emitting component carry out luminous action with the brightness corresponding with video data,
According to based on above-mentioned particular value and above-mentioned unit voltage according to bucking voltage, proofread and correct above-mentioned grayscale voltage, generate to proofread and correct grayscale voltage, offer above-mentioned display pixel.
33. driving method according to claim 32 is characterized in that:
Comprise storage action, this storage action is stored in detected above-mentioned particular value in the memory circuit as correction data.
34. driving method according to claim 33 is characterized in that:
The action that generates above-mentioned correction grayscale voltage comprises following actions,, reads above-mentioned correction data from above-mentioned memory circuit that is;
Generate above-mentioned correction grayscale voltage based on the above-mentioned correction data of reading.
35. driving method according to claim 34 is characterized in that:
The action that generates above-mentioned correction grayscale voltage comprises following actions,, will multiply each other the voltage composition that obtains as above-mentioned bucking voltage from the pairing above-mentioned particular value of the above-mentioned correction data that above-mentioned memory circuit reads and above-mentioned unit voltage that is;
The value that the grayscale voltage addition of above-mentioned bucking voltage and above-mentioned generation is obtained is as above-mentioned correction grayscale voltage.
36. driving method according to claim 33 is characterized in that:
The action that detects above-mentioned particular value comprises following actions, promptly
Read above-mentioned correction data from above-mentioned memory circuit;
According to pairing bias set value of above-mentioned correction data and the above-mentioned unit voltage read, generate bias voltage,
The magnitude of voltage of above-mentioned detection voltage is set at value based on above-mentioned bias voltage value, is applied to above-mentioned display pixel;
The current value of electric current of the electric current stream of above-mentioned driving element is flow through in detection;
The current value of detected above-mentioned electric current and the expectation current value of regulation are compared;
In above-mentioned comparison, the current value of judging detected above-mentioned electric current changes the value of bias set value during less than above-mentioned expectation current value;
The value of above-mentioned bias voltage is updated to based on after changing the above-mentioned bias set value and the value of above-mentioned unit voltage value;
The magnitude of voltage of above-mentioned detection voltage is updated to value based on the above-mentioned bias voltage after the above-mentioned renewal;
The current value and the above-mentioned expectation current value that compare the above-mentioned electric current that goes out based on the above-mentioned detection voltage detecting after this renewal, this relatively in, when the current value of judging detected above-mentioned electric current and above-mentioned expectation current value equate or during greater than above-mentioned expectation current value, do not change the value of above-mentioned bias set value, the value of extracting this bias set value is as above-mentioned particular value.
37. driving method according to claim 36 is characterized in that:
The action of changing the value of above-mentioned bias set value comprises following actions, promptly
In above-mentioned comparison, the current value of above-mentioned electric current of judging detection is during less than above-mentioned expectation current value, and the value of above-mentioned bias set value is changed to value after the increment;
The action of upgrading the value of above-mentioned bias voltage comprises following actions, promptly
Above-mentioned bias set value and the above-mentioned unit voltage voltage composition that obtains that multiplies each other after changing is set at above-mentioned bias voltage.
38. driving method according to claim 36 is characterized in that:
The action of upgrading the magnitude of voltage of above-mentioned detection voltage comprises following actions, promptly
The magnitude of voltage of above-mentioned detection voltage is set at, with above-mentioned bias set value and multiply each other value after the initial value addition of the voltage composition that obtains and this detection voltage of above-mentioned unit voltage after changing.
39., it is characterized in that according to the described driving method of claim 38:
The initial value of above-mentioned detection voltage is to be used to make the magnitude of voltage of above-mentioned light-emitting component with the luminous above-mentioned grayscale voltage of the 1st specific gray scale;
Above-mentioned unit voltage is, above-mentioned the 1st gray scale of above-mentioned grayscale voltage and than the pairing voltage of potential difference (PD) between the 2nd gray scale of low 1 gray scale of this specific gray scale;
Above-mentioned expectation current value is, when above-mentioned driving element is kept under the state of initial characteristic above-mentioned grayscale voltage with above-mentioned the 2nd gray scale and is applied to above-mentioned display pixel, flows through the pairing value of current value of the above-mentioned electric current stream of above-mentioned driving element.
40. the driving method of a display device shows and the video data corresponding image information, it is characterized in that:
Above-mentioned display device possesses display panel, above-mentioned display panel is near each intersection point of many selection wires that are disposed at line direction and column direction and data line, arrange a plurality of display pixels, the electric current that this display pixel has light-emitting component and will flow through the electric current stream offers the driving element of above-mentioned light-emitting component;
Said method comprises following actions, that is:
To select signal to be applied to each bar in above-mentioned many selection wires successively, above-mentioned display pixel of each row is set at selection mode successively;
By above-mentioned each data line, will be applied to above-mentioned each display pixel of the row of above-mentioned selection based on the detection voltage of the unit voltage of stipulating;
Current value based on the electric current stream of the above-mentioned driving element that flows through above-mentioned each display pixel detects the particular value corresponding with the element characteristic of each above-mentioned driving element;
Generate grayscale voltage, this grayscale voltage has and is used to make above-mentioned light-emitting component to carry out the magnitude of voltage of luminous action with the brightness corresponding with above-mentioned video data;
Generation is based on the bucking voltage of above-mentioned particular value and above-mentioned unit voltage;
According to above-mentioned bucking voltage above-mentioned grayscale voltage is proofreaied and correct, generated and proofread and correct grayscale voltage, offer above-mentioned each display pixel of the row of above-mentioned selection by above-mentioned each data line.
41., it is characterized in that according to the described driving method of claim 40:
Above-mentioned a plurality of display pixels are all detected the action of above-mentioned particular value, also comprise storage action, described storage action as correction data, stores detected above-mentioned particular value in the memory circuit into corresponding to each pixel in above-mentioned a plurality of display pixels,
To the action of above-mentioned memory circuitry stores, the timing before the action that above-mentioned correction grayscale voltage is offered above-mentioned each display pixel is carried out.
42., it is characterized in that according to the described driving method of claim 41:
The action that generates above-mentioned correction grayscale voltage and offer above-mentioned each display pixel comprises following actions, promptly
Read the pairing above-mentioned correction data of each above-mentioned display pixel of the row that is set at above-mentioned selection mode from above-mentioned memory circuit,
Generate above-mentioned correction grayscale voltage based on above-mentioned correction data.
43., it is characterized in that according to the described driving method of claim 42:
The action that generates above-mentioned correction grayscale voltage and offer above-mentioned each display pixel comprises following actions, that is,
To multiply each other resulting voltage composition as above-mentioned bucking voltage from pairing above-mentioned particular value of the above-mentioned correction data that above-mentioned memory circuit is read and above-mentioned unit voltage; The value that generation obtains above-mentioned bucking voltage and above-mentioned grayscale voltage addition is as above-mentioned correction grayscale voltage.
44., it is characterized in that according to the described driving method of claim 41:
The action that detects above-mentioned particular value comprises following actions, that is:
Read the pairing above-mentioned correction data of each above-mentioned display pixel of the row that is set at above-mentioned selection mode from above-mentioned memory circuit;
Generate bias voltage, this bias voltage is based on the pairing bias set value of reading of above-mentioned correction data,
The magnitude of voltage of above-mentioned detection voltage is set at value based on above-mentioned bias voltage value, should detects voltage and be applied to above-mentioned each display pixel;
The current value of electric current of electric current stream of the above-mentioned driving element of above-mentioned each display pixel is flow through in detection;
The current value of detected above-mentioned electric current and the expectation current value of regulation are compared;
In above-mentioned comparison, the current value of judging detected above-mentioned electric current changes the value of bias set value during less than above-mentioned expectation current value;
The value of above-mentioned bias voltage is updated to value based on after changing above-mentioned bias set value;
The magnitude of voltage of above-mentioned detection voltage is updated to value based on the bias voltage after the above-mentioned renewal;
Based on the above-mentioned detection voltage after this renewal, the current value of more detected above-mentioned electric current and above-mentioned expectation current value, this relatively in, when the current value of judging detected above-mentioned electric current and above-mentioned expectation current value equate or during greater than above-mentioned expectation current value, do not change the value of above-mentioned bias set value, extract the value of this bias set value, as above-mentioned particular value.
45., it is characterized in that according to the described driving method of claim 44:
The action of changing the value of above-mentioned bias set value comprises following actions, promptly
In above-mentioned comparison, the current value of judging detected above-mentioned electric current is during less than above-mentioned expectation current value, and the value of above-mentioned bias set value is changed to value after the increment;
The action of upgrading the value of above-mentioned bias voltage comprises following actions, promptly
Above-mentioned bias set value and the above-mentioned unit voltage voltage composition that obtains that multiplies each other after changing is set at above-mentioned bias voltage.
46., it is characterized in that according to the described driving method of claim 45:
The action of upgrading the magnitude of voltage of above-mentioned detection voltage comprises following actions, promptly
The magnitude of voltage of above-mentioned detection voltage is set at, with above-mentioned bias set value and multiply each other value after the initial value addition of the voltage composition that obtains and this detection voltage of above-mentioned unit voltage after changing.
47., it is characterized in that according to the described driving method of claim 46:
The initial value of above-mentioned detection voltage is to be used to make above-mentioned light-emitting component with the 1st specific gray scale magnitude of voltage luminous, above-mentioned grayscale voltage;
Above-mentioned unit voltage is with above-mentioned the 1st gray scale of above-mentioned grayscale voltage with than the corresponding voltage of potential difference (PD) between the 2nd gray scale of low 1 gray scale of this specific gray scale;
Above-mentioned expectation current value is, when above-mentioned driving element is kept under the state of initial characteristic above-mentioned grayscale voltage with above-mentioned the 2nd gray scale and is applied to above-mentioned display pixel, with the corresponding value of current value of the above-mentioned electric current stream that flows through above-mentioned driving element.
48., it is characterized in that according to the described driving method of claim 47:
Above-mentioned the 1st gray scale is the highest gray scale that above-mentioned light-emitting component is set.
49., it is characterized in that according to the described driving method of claim 44:
Above-mentioned each display pixel possesses pixel-driving circuit, and above-mentioned pixel-driving circuit has at least:
The 1st on-off element, an end of its electric current stream is applied in supply voltage, and the other end of this electric current stream connects with the contact that is connected of above-mentioned light-emitting component, and is electrically connected with above-mentioned data line, constitutes above-mentioned driving element;
The 2nd on-off element, an end of its electric current stream is applied in above-mentioned supply voltage, and the other end of this electric current stream is connected with the control terminal of above-mentioned the 1st on-off element;
The voltage holding element is connected between the above-mentioned control terminal and above-mentioned connection contact of above-mentioned the 1st on-off element;
Above-mentioned driving method comprises following actions:
Carrying out the action that above-mentioned particular value detects and generating above-mentioned correction grayscale voltage, and offering during the action of above-mentioned each display pixel, above-mentioned supply voltage is set at is having that to make above-mentioned light-emitting component be the 1st voltage of the magnitude of voltage of non-luminance;
In timing after this, set above-mentioned supply voltage, it is switched to have that to make above-mentioned light-emitting component be the 2nd voltage of the magnitude of voltage of luminance, above-mentioned each light-emitting component is set at luminance.
50., it is characterized in that according to the described driving method of claim 49:
The action of carrying out above-mentioned particular value detection comprises following actions, promptly
Make the above-mentioned electric current stream conducting of above-mentioned the 2nd on-off element, an end of the above-mentioned electric current stream of the control terminal of above-mentioned the 1st on-off element and the 1st on-off element is electrically connected;
Above-mentioned supply voltage is set at above-mentioned the 1st voltage;
Above-mentioned detection voltage is applied to the other end of the electric current stream of above-mentioned the 1st on-off element.
51., it is characterized in that according to the described driving method of claim 49:
The action that above-mentioned correction grayscale voltage is offered above-mentioned each display pixel comprises following write activity, promptly
Make the above-mentioned electric current stream conducting of above-mentioned the 2nd on-off element, an end of the above-mentioned electric current stream of the control terminal of above-mentioned the 1st on-off element and the 1st on-off element is electrically connected;
Above-mentioned supply voltage is set at above-mentioned the 1st voltage;
Above-mentioned correction grayscale voltage is applied to the other end of the electric current stream of above-mentioned the 1st on-off element.
52., it is characterized in that according to the described driving method of claim 51:
The action that above-mentioned correction grayscale voltage is offered above-mentioned each display pixel also comprises following maintenance action, promptly
Timing after having carried out above-mentioned write activity makes the above-mentioned electric current stream of above-mentioned the 2nd on-off element non-conduction, and the end electricity of the above-mentioned electric current stream of the above-mentioned control terminal of above-mentioned the 1st on-off element and the 1st on-off element is disconnected;
Above-mentioned supply voltage is set at above-mentioned the 1st voltage;
To remain in the above-mentioned voltage holding element by suitable voltage composition with the potential difference (PD) at the two ends of the electric current stream that is applied to above-mentioned the 1st on-off element.
53., it is characterized in that according to the described driving method of claim 49:
The action that above-mentioned each light-emitting component is set in luminance comprises following luminous action, promptly
Make the above-mentioned electric current stream of above-mentioned the 2nd on-off element non-conduction, the end electricity of the above-mentioned electric current stream of the above-mentioned control terminal of above-mentioned the 1st on-off element and the 1st on-off element is disconnected;
Above-mentioned supply voltage is set at above-mentioned the 2nd voltage, the pairing electric current of voltage composition that keeps in the above-mentioned voltage holding element is offered above-mentioned each light-emitting component.
54., it is characterized in that according to the described driving method of claim 49:
The action that above-mentioned each light-emitting component is set in luminance comprises following actions, that is:
Above-mentioned a plurality of display pixels are divided into a plurality of groups that have multirow respectively, the above-mentioned supply voltage of electric current stream one end of above-mentioned the 1st on-off element that is applied to the above-mentioned multirow display pixel of this each group is set at above-mentioned the 2nd voltage, the light-emitting component of the above-mentioned multirow display pixel of each group is set at luminance simultaneously.
55. the driving method of a display device shows and the video data corresponding image information, it is characterized in that:
Above-mentioned display device possesses display panel, and above-mentioned display panel is arranged with a plurality of display pixels, and above-mentioned display pixel has light-emitting component and controls the pixel-driving circuit of the luminance of this light-emitting component;
Above-mentioned pixel-driving circuit has at least:
The 1st on-off element, it has control terminal and electric current stream, and an end of above-mentioned electric current stream is applied in supply voltage, and the other end connects with the contact that is connected of above-mentioned light-emitting component, and applies the signal voltage based on above-mentioned video data;
The 2nd on-off element, it has control terminal and electric current stream, and an end of this on-off element is applied in above-mentioned supply voltage, and the other end is connected with the control terminal of above-mentioned the 1st on-off element;
The voltage holding element is connected between the above-mentioned control terminal and above-mentioned connection contact of above-mentioned the 1st on-off element;
Above-mentioned driving method comprises following action, promptly
Write activity, make the above-mentioned electric current stream conducting of above-mentioned the 2nd on-off element, one end of the above-mentioned electric current stream of the control terminal of above-mentioned the 1st on-off element and the 1st on-off element is electrically connected, above-mentioned supply voltage is set at has that to make above-mentioned light-emitting component be the 1st voltage of the magnitude of voltage of non-luminance, will the data voltage corresponding be applied to the other end of this electric current stream with video data;
Luminous action, make the above-mentioned electric current stream of above-mentioned the 2nd on-off element non-conduction, the one end electricity of the above-mentioned electric current stream of the control terminal of above-mentioned the 1st on-off element and the 1st on-off element is disconnected, above-mentioned supply voltage is set at has that to make above-mentioned light-emitting component be the 2nd supply voltage of the magnitude of voltage of luminance, make drive current flow through above-mentioned light-emitting component, this drive current is based on the above-mentioned voltage composition that remains in the above-mentioned voltage holding element.
56., it is characterized in that according to the described driving method of claim 55:
Also comprise and keep action, promptly
Timing after having carried out above-mentioned write activity, make the above-mentioned electric current stream of above-mentioned the 2nd on-off element non-conduction, the one end electricity of the above-mentioned electric current stream of the above-mentioned control terminal of above-mentioned the 1st on-off element and the 1st on-off element is disconnected, above-mentioned supply voltage is set at above-mentioned the 1st voltage, the voltage composition suitable with potential difference (PD) that is applied to the two ends of this electric current stream remained in the above-mentioned voltage holding element.
57., it is characterized in that according to the described driving method of claim 55:
Above-mentioned luminous action also comprises following actions, promptly
Above-mentioned a plurality of display pixels are divided into a plurality of groups that have multirow respectively, the above-mentioned supply voltage of electric current stream one end of above-mentioned the 1st on-off element of above-mentioned multirow display pixel that is applied to each group of each group is set at above-mentioned the 2nd voltage, the light-emitting component of the above-mentioned multirow display pixel of each group of each group is set at luminance simultaneously.
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| JP2006209534A JP4314638B2 (en) | 2006-08-01 | 2006-08-01 | Display device and drive control method thereof |
| JP209534/2006 | 2006-08-01 | ||
| JP218805/2006 | 2006-08-10 | ||
| JP2006218805A JP4284704B2 (en) | 2006-08-10 | 2006-08-10 | Display drive device and drive control method thereof, and display device and drive control method thereof |
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|---|---|
| JP4314638B2 (en) | 2009-08-19 |
| JP2008039799A (en) | 2008-02-21 |
| CN101123068B (en) | 2011-10-26 |
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