CN1918617B - Light emission drive circuit and its drive control method and display unit and its display drive method - Google Patents

Light emission drive circuit and its drive control method and display unit and its display drive method Download PDF

Info

Publication number
CN1918617B
CN1918617B CN2005800047929A CN200580004792A CN1918617B CN 1918617 B CN1918617 B CN 1918617B CN 2005800047929 A CN2005800047929 A CN 2005800047929A CN 200580004792 A CN200580004792 A CN 200580004792A CN 1918617 B CN1918617 B CN 1918617B
Authority
CN
China
Prior art keywords
voltage
light emission
current
rate sequence
electric charge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2005800047929A
Other languages
Chinese (zh)
Other versions
CN1918617A (en
Inventor
白崎友之
小仓润
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Soras Oled
Original Assignee
Casio Computer Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2004368031A external-priority patent/JP2006177988A/en
Priority claimed from JP2004368850A external-priority patent/JP4400443B2/en
Application filed by Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority claimed from PCT/JP2005/023214 external-priority patent/WO2006064943A1/en
Publication of CN1918617A publication Critical patent/CN1918617A/en
Application granted granted Critical
Publication of CN1918617B publication Critical patent/CN1918617B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)

Abstract

A light emission drive circuit includes an electric charge accumulating section for accumulating electric charges on the basis of a gradation sequence signal designating a luminance gradation sequence. A light emission control section flows a light emission drive current having a current value in accordance with an amount of the electric charges accumulated in the electric charge accumulating section. A writing control section controls a supplying state of the electric charges based on the gradation sequence signal to the electric charge accumulating section on the basis of a first control signal. A voltage control section controls a drive voltage for operating the light emission controlling section on the basis of a second control signal.

Description

Light emission drive circuit and drive controlling method thereof and display unit and display drive method thereof
Technical field
The present invention relates to a kind of light emission drive circuit and drive controlling method thereof and display unit and display drive method thereof.Particularly, the present invention relates to adopt a kind of light emission drive circuit and the drive controlling method thereof of current-control type (or current drive-type) light-emitting component, and the display unit and the display drive method thereof that offer each display pixel, this current-control type (or current drive-type) light-emitting component by provide with the corresponding electric current of video data to a plurality of display panels (pel array) and luminous with predetermined brightness rate sequence (luminance gradation sequence).
Background technology
In recent years,, be extensive use of a kind of display device, replaced adopting traditional display unit of conventional cathode ray tube (CRT) as the monitor ﹠ display of PC and video system.Especially, LCD (LCD) is popularized fast, because compare with traditional monitor, it can make thinner, lighter (lighter), bigger and low energy consumption or the like.In addition, less relatively LCD also has been widely used as the display device of having popularized very much in recent years, for example cell phone, digital camera and PDA(Personal Digital Assistant).
As the display device of future generation (display) after this type of LCD, expected the light-emitting component type display device of commercial viability of a kind of very tool and popularization, wherein organic electroluminescent (below be abbreviated as " organic EL ") and inorganic EL (below be abbreviated as " inorganic EL element ") or such as the light-emitting component (emissive type display pixel) of light emitting diode (LED) with arranged.
Especially, compare with above-mentioned LCD, adopt the light-emitting component escope of active matrix drive system to have high demonstration response speed, ignore angular dependence (-dance) (viewing angledependency), have high resolving power of high brightness, high-contrast and image quality or the like.And, the light-emitting component escope do not resemble need the LCD backlight.Therefore, the light-emitting component escope has very excellent characteristic, so can make thinlyyer and lighter, and energy consumption can be lower.
In this type of light-emitting component escope, proposed to be used to control the various drive controlling mechanism and the control method of the operation (luminance) of this light-emitting component.For example, described in Japanese Patent Application Publication No.8-330600, known a kind of structure, except that above-mentioned light-emitting component, also comprise being provided with being used for the driving circuit (below be abbreviated as " light emission drive circuit ") of a plurality of on-off elements that light emitting drive is controlled the light-emitting component of each display pixel, to constitute display panel.
Figure 22 is the schematic diagram that illustrates according to the major part of the Control of Voltage active matrix light-emitting element type display of prior art.Figure 23 illustrates the equivalent circuit diagram that can be applied to according to the configuration example of the display pixel (light emission drive circuit and light-emitting component) of the light-emitting component escope of prior art.Here, in Figure 23, the circuit arrangement that is provided with as the organic EL of light-emitting component is shown.
Shown in Figure 22 is rough, active matrix organic EL display unit described in the Japanese Patent Application Publication No.8-330600 is configured to comprise: display panel 110P, wherein a plurality of display pixel EMp are arranged in respectively the multi-strip scanning line (selection wire of arranging on horizontal and vertical; Signal wire on the Y direction) SLp and data line (signal wire; Signal wire on directions X) near the matrix each intersection point of DLp; Be connected to scanner driver (peripheral drive circuit on the Y direction) 120P of every sweep trace SLp; With the data driver that is connected to every data line DL (peripheral drive circuit on the directions X) 130P.
As shown in figure 23, each display pixel EMp is configured to have: the light emission drive circuit DCp that comprises thin film transistor (TFT) (TFT) Tr 111 and thin film transistor (TFT) Tr 112, in this thin film transistor (TFT) (TFT) Tr 111, gate terminal is connected to sweep trace SLp, source terminal and drain terminal are connected respectively to data line DL and contact N111, in this thin film transistor (TFT) Tr 112, gate terminal is connected to contact N111, and predetermined power source voltage Vdd puts on source terminal; And organic EL (current-control type light-emitting component) OEL, in this organic EL, anode terminal is connected to the drain terminal of the thin film transistor (TFT) Tr 112 of light emission drive circuit DCp, and the earth potential Vgnd that current potential is lower than supply voltage Vdd puts on cathode terminal.Here, in Figure 23, reference number C p represents to be formed on the capacitor between the gate-source of thin film transistor (TFT) Tr 112.
In the display unit that comprises the display panel 110P that disposes by display pixel EMp with this class formation, at first, apply the scanning voltage signal Ssel of conduction level continuously to each sweep trace SLp from scanner driver 120P, thereby the thin film transistor (TFT) Tr 111 of the every capable display pixel EMp of conducting (light emission drive circuit DCp), and display pixel EMp is set to selection mode.
Select regularly synchronously with this, give each row of data line DLp by applying by data driver 130P, apply the current potential of corresponding this grade sequence signal voltage Vpix via the thin film transistor (TFT) Tr 111 of each display pixel EMp (light emission drive circuit DCp) to contact N111 (being the gate terminal of thin film transistor (TFT) Tr 112) with the corresponding rate sequence signal voltage of video data Vpix.
Thereby, descending conducting membrane transistor Tr 112 with the corresponding conducting state of the current potential of contact N111 (that is, with the corresponding conducting state of rate sequence signal voltage Vpix).Then, via thin film transistor (TFT) Tr 112 and organic EL OEL from supply voltage Vdd to the predetermined light emission drive current of earth potential Vgnd supply, and this organic EL OEL with and the corresponding brightness degree sequence of video data (rate sequence signal voltage Vpix) carry out light emission operation.
Below, by apply the scanning voltage signal Ssel of cut-off level to sweep trace SLp from scanner driver 120P, the thin film transistor (TFT) Tr 111 of every capable display pixel EMp ends, and display pixel EMp is set to nonselection mode, and data line DLp and light emission drive circuit DCp are by electric shield.In this case, when the current potential of the gate terminal that puts on thin film transistor (TFT) Tr 112 (contact N111) remains among the capacitor Cp, predetermined potential is applied between the grid and source electrode of this thin film transistor (TFT) Tr 112, and this causes thin film transistor (TFT) Tr 112 to keep conducting state.
Therefore, the same with light emission operation in the above-mentioned selection mode, via thin film transistor (TFT) Tr112 from supply voltage Vdd to the predetermined light emission drive current of organic EL OEL supply, and continue light emission operation.The control light emission operation is for example continued it, up to the rate sequence signal voltage Vpix that applies (writing) corresponding next video data in every capable display pixel EMp on a frame.
Because put on the magnitude of voltage (rate sequence signal voltage Vpix) of the voltage of each display pixel EMp (gate terminal of the thin film transistor (TFT) Tr 112 of light emission drive circuit DCp specifically) by control, control the current value of the light emission drive current that is supplied to organic EL OEL, thereby carry out light emission operation by the predetermined brightness rate sequence, so this type of driven control method is called as electric pressure sequence flag system (or the electric pressure sequence flag drives).
Wherein there is following point in the display unit of the light emission drive circuit of corresponding voltage rate sequence designation system being set for each display pixel.
In light emission drive circuit DCp as shown in figure 23, current path is connected in series to organic EL OEL, and be used for optical drive and change (running modification) along with service time or the like for the operating characteristic (especially threshold voltage value characteristic) of the thin film transistor (TFT) Tr 112 of optical drive electric current that should corresponding video data (rate sequence signal voltage). in this type of situation, be changed (for example reducing) with predetermined grid voltage (current potential of contact N111) at the current value of the light emission drive current that flows between source electrode and the drain electrode (electric current between source electrode and the drain electrode)., be difficult to long-term and stably to realize light emission operation with the corresponding suitably brightness degree sequence of video data for this reason.
In addition, under the variable situation of the element characteristic (threshold voltage characteristic) of the thin film transistor (TFT) Tr 111 of display panel 110P inside for each light emission drive circuit DCp and 112, perhaps under the variable situation of the element characteristic of thin film transistor (TFT) Tr111 for each display panel 110P of production lot decision and 112, in the light emission drive circuit of electric pressure sequence flag system, the above-mentioned variation of the current value of light emission drive current becomes big.For this reason, can't carry out suitable rate sequence control, and the displayed image quality descends.
Summary of the invention
The display unit and the display drive method thereof that the purpose of this invention is to provide a kind of light emission drive circuit and drive controlling method thereof and have good displayed image quality, this light emission drive circuit can be by supply of current value and the corresponding light emission drive current of video data, and realizes by being used for the operation of light emitting drive light-emitting component with the corresponding suitably brightness degree sequence of video data.
According to a first aspect of the invention, be provided for supplying light emission drive current and make light-emitting component carry out luminous a kind of light emission drive circuit, comprising:
The electric charge sump portion is used for according to indicating that the rate sequence signal of brightness degree sequence gathers electric charge;
The light emitting control part, being used for flowing has light emission drive current with the quantity of electric charge respective electrical flow valuve of gathering at the electric charge sump portion;
Write control section, be used for according to first control signal, control is fed to the supply status of electric charge sump portion based on the electric charge of rate sequence signal; And
The Control of Voltage part is used for according to second control signal, and control is used for the driving voltage of operating light-emitting control section.
According to a second aspect of the invention, provide a kind of illuminating circuit, comprising:
Selection wire;
Retention wire;
Data line;
Supply voltage line;
Have the grid of the retention wire of being electrically connected to and the maintenance transistor of current path;
Driving transistors with grid and current path, the grid of this driving transistors are electrically connected to an end that keeps transistorized current path, and an end of the current path of driving transistors is connected to supply voltage line; And
Selection transistor with grid and current path, select transistorized grid to be electrically connected to selection wire, select an end of transistorized current path to be connected to the other end of the current path of driving transistors, select the other end of transistorized current path to be connected to data line.
According to a third aspect of the invention we, provide a kind of drive controlling method of light emission drive circuit, this drive controlling method provides light emission drive current so that light-emitting component carries out luminously to light-emitting component, and this drive controlling method comprises:
Thereby first potential difference (PD) is set between the grid of transistor unit and source electrode to light-emitting component supply light emission drive current, this first potential difference (PD) equals the threshold value of transistor unit, or equals to produce and make light-emitting component carry out the minimum brightness voltage that the required light emission drive current of light emission operation needs by the minimum brightness rate sequence;
Apply the rate sequence signal to transistor unit and make light-emitting component carry out light emission operation, and between the grid of transistor unit and source electrode, be provided with and corresponding second potential difference (PD) of brightness degree sequence by the brightness degree sequence; And
With predetermined conducting state turn-on transistor element, produce current value and the corresponding light emission drive current of brightness degree sequence according to second potential difference (PD), and it supplied with light-emitting component.
According to a forth aspect of the invention, provide a kind of display unit, comprising:
A plurality of display pixels, each display pixel comprises light-emitting component and light emission drive circuit, this light emission drive circuit has respectively: the electric charge sump portion, indicate and the corresponding brightness degree sequence of video data thereby be used for gathering electric charge according to the rate sequence signal; The light emitting control part is used for producing the light emission drive current that has with the corresponding predetermined current value of gathering at the electric charge sump portion of electric charge, and provides light emission drive current to light-emitting component; Write control section, be used to control based on the electric charge of rate sequence signal supply status to the electric charge sump portion; With the Control of Voltage part, be used to control the driving voltage that makes light emitting control part executable operations;
Selection wire wherein applies the write control signal of the mode of operation that writes control section that is used to control each display pixel;
Retention wire wherein applies the voltage control signal of the mode of operation of the Control of Voltage part that is used to control each display pixel; With
Be supplied the data line of rate sequence.
According to a fifth aspect of the invention, provide a kind of display, have:
Selection wire;
Retention wire;
Data line;
Supply voltage line;
Keep transistor, this keeps transistorized grid to be connected to retention wire;
Driving transistors with grid and current path, the grid of this driving transistors are connected to an end that keeps transistorized current path, and an end of the current path of driving transistors is connected to supply voltage line;
Selection transistor with grid and current path, select transistorized grid to be connected to selection wire, select an end of transistorized current path to be connected to the other end of the current path of driving transistors, and select the other end of transistorized current path to be connected to data line;
Be connected to the light-emitting component of the other end of the current path of driving transistors;
The selection driver of signal to selection wire selected in output;
The output holding signal is to the maintenance driver of retention wire;
The Class Of Supply sequence signal is to the data driver of data line; And
The output supply voltage is to the supply voltage driver of supply voltage line.
According to a sixth aspect of the invention, a kind of display drive method of display unit is provided, this display unit comprises the display panel with a plurality of display pixels, by supply indicate with the rate sequence signal of the corresponding brightness degree sequence of video data to each display pixel, make each display pixel carry out light emission operation by the predetermined brightness rate sequence, and show the image information of expection on display panel, this method comprises:
At least a portion of these a plurality of display pixels is set to selection mode, and between grid one end of transistor unit and current path one end, first potential difference (PD) is set, thereby give the current-control type light-emitting component supply that is provided with in each display pixel light emission drive current, this first potential difference (PD) equals the threshold voltage of transistor unit, or equals to produce the minimum brightness voltage that light-emitting component is needed by the required light emission drive current of minimum brightness rate sequence execution light emission operation;
Sequentially the every capable display pixel of display panel is set to selection mode, sequentially apply the light-emitting component that is used to make each display pixel by carrying out the rate sequence signal of light emission operation, and between the grid of transistor unit and current path one end, be provided with and corresponding second potential difference (PD) of brightness degree sequence with the corresponding predetermined luminance rate sequence of video data; And
At least a portion of a plurality of display elements of arranging on the display panel is set to nonselection mode, transistor unit according to second each display element of potential difference (PD) conducting, and separately for each light-emitting component produces current value and the corresponding light emission drive current of brightness degree sequence, and glow current is supplied to each light-emitting component.
This light emitting control part can have the driving transistors that comprises current path and control terminal, and the current value of light emission drive current wherein is set by the potential difference (PD) between an end of control terminal and current path.
This light emitting control part can have the driving transistors that comprises current path and control terminal, in the write operation time cycle, the flow light emission drive current of this current value of this driving transistors, the current value of this light emission drive current are based on the rate sequence signal of conduct, flow through the current value of the write current of this current path in light emission operation in the time cycle.
This light emitting control part can have the driving transistors that comprises current path and control terminal, and in the time cycle, this driving transistors applies an end and the other end of the voltage of the scope of reaching capacity to current path in light emission operation.
In the time cycle of precharge operation, apply pre-charge voltage can for the electric charge sump portion above the threshold value of light emitting control part.
In time cycle, by make the electric charge partial discharge of gathering in the electric charge sump portion according to pre-charge voltage, voltage is provided with part can keep predetermined electric charge in the light emitting control part at correct operation.
After time cycle, voltage is provided with part and can also gathers in the electric charge sump portion and rate sequence electric current corresponding charge at correct operation.
This voltage is provided with partly can be provided with and writes control section and Control of Voltage part, this writes control section and is used for according to the electric charge supply status of rate sequence signal controlling to the electric charge sump portion, and the voltage that this Control of Voltage partly is used to control the driving transistors control terminal applies state.
This voltage is provided with part can have the pre-charge voltage applying portion and write control section, the pre-charge voltage applying portion is used for applying pre-charge voltage above the threshold value of light emitting control part to the electric charge sump portion, and this writes control section and is used for according to the electric charge supply status of rate sequence signal controlling to the electric charge sump portion.In addition, this pre-charge voltage and this grade sequence signal can impose on the electric charge sump portion selectively via writing control section.
This voltage is provided with part can have the selection transistor, and this selects an end of transistorized current path to be connected to an end of electric charge sump portion.
This voltage is provided with part can have the maintenance transistor, and this keeps an end of transistorized current path to be connected to the control terminal of driving transistors and the other end of electric charge sump portion.
This voltage is provided with part can have the transistor of selection and keep transistor, this selects an end of transistorized current path to be connected to an end of electric charge sump portion and an end of driving transistors, and the other end of the transistorized current path of this selection is connected to the rate sequence signal wire that the rate sequence signal flow is crossed, and this keeps an end of transistorized current path to be connected to the control terminal of driving transistors and the other end of electric charge sump portion.
Select transistor to operate, and can operate by the secondary signal different with first control signal by first control signal.
According to an eighth aspect of the invention, provide a kind of drive controlling method of light emission drive circuit, this light emission drive circuit is used for flowing light emission drive current so that the light-emitting component execution is luminous, and this drive controlling method comprises:
The first potential difference (PD) step, therein between the control terminal and current path one end of the driving transistors that is provided with by the potential difference (PD) between control terminal and current path one end of the current value of light emission drive current, according to pre-charge voltage first potential difference (PD) is set, this pre-charge voltage makes the minimum brightness rate sequence of light-emitting component by the required light emission drive current needs of minimum brightness rate sequence execution light emission operation greater than being used to produce, and is perhaps poor greater than threshold potential;
The second potential difference (PD) step by coming the conducting driving transistors according to first potential difference (PD), is provided with second potential difference (PD) between the control terminal of driving transistors and current path one end, this second potential difference (PD) equal the minimum brightness potential difference (PD) or threshold potential poor; With
The 3rd potential difference (PD) step, be used to make light-emitting component to carry out the rate sequence signal of light emission operation by the predetermined luminance rate sequence by applying, and make the rate sequence signal flow to the current path of driving transistors, between the control terminal of driving transistors and current path one end, the 3rd potential difference (PD) that equals the brightness degree sequence is set.
The step that the 3rd potential difference (PD) is set can have predetermined current value by applying as the rate sequence signal, be used to make light-emitting component to carry out the rate sequence electric current of light emission operation by the predetermined luminance rate sequence, thereby the electric charge of causing for control terminal and second current potential between current path one end by driving transistors adds and gathers electric charge based on the rate sequence electric current.
According to a ninth aspect of the invention, provide a kind of display unit, comprising:
Light-emitting component; With
The a plurality of display pixels that comprise light emission drive circuit, this light emission drive circuit has the electric charge sump portion respectively, light emitting control part and voltage are provided with part, thereby the electric charge sump portion is used for gathering electric charge sign and the corresponding brightness degree sequence of video data according to rate sequence, light emitting control partly is used for producing the light emission drive current that has with the corresponding predetermined current value of gathering at the electric charge sump portion of electric charge, and this light emission drive current is supplied to light-emitting component, voltage is provided with part and is used for making the electric charge partial discharge of gathering at the electric charge sump portion, thereby makes light emitting control part light emission drive current be set to predetermined current value.
This light emitting control part can be provided with current path and control terminal, and can have driving transistors, in this driving transistors, the current value of light emission drive current is set by the potential difference (PD) between control terminal and current path one end.
This light emitting control part can be provided with current path and control terminal, and can have driving transistors, this driving transistors to be at the light emission operation light emission drive current that is used in the time cycle flowing, this light emission drive current based on as the rate sequence signal in the write operation time cycle, flow through the current value of the write current of this current path.
This light emitting control part can be provided with current path and control terminal, and can have driving transistors, and in this driving transistors, the voltage that reaches capacity in the time cycle in light emission operation imposes on an end and the other end of current path.
At precharge operation in the time cycle, apply pre-charge voltage can for the electric charge sump portion above the threshold value of driving transistors.
In time cycle, by partly be released in the electric charge that gathers in the electric charge sump portion according to pre-charge voltage, voltage is provided with part can keep predetermined electric charge in driving transistors at correct operation.
In time cycle, by partly be released in the electric charge that gathers in the electric charge sump portion according to pre-charge voltage, voltage is provided with part can keep predetermined electric charge in driving transistors at correct operation.
After time cycle, voltage is provided with part and can also gathers in the electric charge sump portion and rate sequence electric current corresponding charge at correct operation.
This voltage is provided with part can have the pre-charge voltage applying portion and write control section, the pre-charge voltage applying portion is used for the electric charge sump portion is applied pre-charge voltage above the threshold value of driving transistors, this write control section be used to control to the electric charge sump portion, according to the electric charge supply status of rate sequence signal, and this pre-charge voltage and this grade sequence signal can impose on the electric charge sump portion selectively via writing control section.
This voltage is provided with part can have the selection transistor, and this selects an end of transistorized current path to be connected to an end of electric charge sump portion.
Be provided with in the part at this voltage, an end of current path is connected to the control terminal of driving transistors and the other end of electric charge sump portion.
This voltage is provided with part can have the transistor of selection and keep transistor, this selects an end of transistorized current path to be connected to an end of electric charge sump portion and an end of driving transistors, and the other end of the transistorized current path of this selection is connected to the rate sequence signal wire that the rate sequence signal flow is crossed, and this keeps an end of transistorized current path to be connected to the control terminal of driving transistors and the other end of electric charge sump portion.
Select transistor to operate, and can operate by the secondary signal different with first control signal by first control signal.
This display unit can be provided with rate sequence signal provision part, be used for the rate sequence signal wire of part being set to each display pixel Class Of Supply sequence signal via being connected to voltage, and in the light emission drive circuit of each display pixel, the rate sequence signal that puts on the rate sequence signal wire can be provided with part via voltage and put on the electric charge sump portion.
This grade sequence signal supply section can be provided with and be used to produce above the pre-charge voltage of the threshold value of light emitting control part and be applied to the part of rate sequence signal wire, and in the illuminating circuit of each display pixel, the pre-charge voltage that puts on the rate sequence signal wire can be provided with part via voltage and put on the electric charge sump portion.
This grade sequence signal supply section can apply pre-charge voltage and rate sequence signal for selectively the rate sequence signal wire.
This grade sequence signal is the rate sequence electric current with predetermined current value, is used to make light-emitting component to carry out light emission operation by the brightness degree sequence of wanting based on video data, and can accumulates in the electric charge sump portion with rate sequence electric current corresponding charge.
This voltage is provided with partly can be provided with and writes control section and Control of Voltage part, this writes control section and is used for according to the electric charge supply status of rate sequence signal controlling to the electric charge sump portion, and the voltage that this Control of Voltage partly is used to control the driving transistors control terminal applies state.
This voltage is provided with part can also be provided with write signal line and voltage signal line, write control signal is used to control the mode of operation that writes control section in the write signal line, for the voltage signal line, voltage control signal is used to control the Control of Voltage mode of operation partly of each display pixel.
This voltage is provided with part and can also be provided with and be used for applying writing drive part and being used for applying the driven part of voltage control signal to the voltage signal line of write control signal to the write signal line.
This voltage is provided with part can be provided with the power drives part that is used for partly applying supply voltage to light emitting control.
According to the tenth aspect of the invention, provide a kind of display drive method of display unit, be used to make the light-emitting component execution of a plurality of display pixels of arranging on line direction and column direction luminous, this display drive method comprises:
The first potential difference (PD) step, be set to selection mode and light emission drive current offered between the control terminal and current path one end of driving transistors of light-emitting component at display pixel, according to pre-charge voltage first potential difference (PD) is set, this pre-charge voltage makes the minimum brightness rate sequence of light-emitting component by the required light emission drive current needs of minimum brightness rate sequence execution light emission operation greater than being used to produce, and is perhaps poor greater than threshold potential;
The second potential difference (PD) step by coming the conducting driving transistors according to first potential difference (PD), is provided with second potential difference (PD) between the control terminal of transistor unit and current path one end, it is poor that this second potential difference (PD) equals this minimum brightness potential difference (PD) or equals this threshold potential;
The 3rd potential difference (PD) step, make light-emitting component carry out the rate sequence signal of light emission operation and make the current path of rate sequence signal flow by applying, between the control terminal of driving transistors and current path one end, the 3rd potential difference (PD) that equals this brightness degree sequence is set to driving transistors by the predetermined luminance rate sequence; And
Luminous step, the other end of the current path by giving driving transistors applies voltage, makes an end of current path and the potential difference (PD) between the other end saturated, and driving transistors makes the light emission drive current based on the rate sequence signal flow to light-emitting component.
The first potential difference (PD) step can be set to selection mode by a plurality of simultaneously display pixels.Second potential difference (PD) step multirow display pixel simultaneously is set to nonselection mode, thereby second potential difference (PD) is set to equal minimum brightness voltage.The 3rd potential difference (PD) step can be set to selection mode by sequentially every capable display pixel, thereby sequentially makes the rate sequence signal flow to the current path of driving transistors.This luminous step can make light emission drive current flow to the multirow light-emitting component simultaneously.
By applying rate sequence electric current as the rate sequence signal with predetermined current value, this predetermined current value makes the light-emitting component of each display pixel be in the predetermined luminance rate sequence, the step of the 3rd potential difference (PD) of each display pixel is set, can will add based on the electric charge of rate sequence electric current and accumulate to the electric charge that second potential difference (PD) of the control terminal of transistor unit and current path one end produces, thereby the 3rd potential difference (PD) is set.
The tenth on the one hand according to the present invention, and a kind of light emission drive circuit is provided, and comprising:
Emission control device, this emission control device have the current path that flows from the light emission drive current of current path;
Electric charge stacking device, this electric charge stacking device are used to gather and the current value corresponding charge that flows through the electric current of emission control device;
The voltage setting device, this voltage setting device is used for mobile its current value makes light-emitting component can carry out the electric current of light emission operation with the predetermined luminance except non-luminous (no-light) brightness degree sequence, and is used for gathering the electric charge of the predetermined luminance rate sequence that equals the electric charge stacking device; With
The rate sequence setting device, this grade sequence setting device is used for discharging the electric charge that equals the predetermined luminance rate sequence that gathers at the electric charge stacking device according to non-luminosity rate sequence signal, up to this electric charge become make light-emitting component be equivalent to its current value to make light-emitting component be the electric charge of the light emission drive current of non-luminance, perhaps make the immobilising electric charge of light emission drive current.
Unless this grade sequence setting device can be supplied non-luminosity rate sequence signal selectively and equal rate sequence signal outside the luminosity rate sequence, the brightness degree sequence.
Preferred non-luminosity rate sequence signal is the voltage signal of scheduled voltage, is the current signal of predetermined current value unless equal the rate sequence signal of the brightness degree sequence outside the luminosity rate sequence.
This grade sequence setting device can flow pre-charge current to emission control device, thereby in the electric charge stacking device, gather the electric charge that equals the high brightness level sequence, the current value of this pre-charge current is enough to make light-emitting component to carry out light emission operation by the brightness degree sequence higher than the predetermined luminance rate sequence except that the non-luminosity rate sequence in cycle precharge time.
This voltage setting device can flow correcting current to emission control device, thereby part is released in the electric charge that gathers in the electric charge stacking device, the current value of this correcting current is enough to make light-emitting component by carrying out light emission operation except that the predetermined luminance rate sequence the non-luminosity rate sequence of correct operation in the time cycle.
This emission control device can be provided with control terminal, and can have driving transistors, in this driving transistors, the current value of light emission drive current is set by the potential difference (PD) between control terminal and current path one end.
This emission control device can be provided with control terminal, and can have driving transistors, this driving transistors is at flow in the time cycle light emission drive current of this current value of light emission operation, its current value based on as the rate sequence signal in the write operation time cycle, flow through the current value of the write current of this current path.
This emission control device can be provided with control terminal, and can have driving transistors, and the voltage in the zone that wherein reaches capacity puts on an end and the other end thereof of this current path.
This voltage setting device can be provided with current control device and driving transistors device for selection controlling, this current control device is connected between current path one end and rate sequence setting device of driving transistors, is used to control the electric current that flows through the drive transistor current path; This driving transistors device for selection controlling is connected to the control terminal of driving transistors, is used for the transistorized selection mode of controlling and driving.
This current control device can have the selection transistor that control terminal wherein is connected to selection wire, and this driving transistors device for selection controlling can have the maintenance transistor that control terminal wherein is connected to retention wire.
This current control device can be operated by first control signal, and this driving transistors device for selection controlling can be operated by the secondary signal different with first control signal.
The 12 aspect according to the present invention provides a kind of drive controlling method of light emission drive circuit, is used for the light emission drive current that flows, and it is luminous that light-emitting component is carried out, and this drive controlling method comprises:
The first potential difference (PD) step, between the control terminal of driving transistors and current path one end, produce first potential difference (PD), make that regardless of the brightness degree sequence signal electric current of this current value also makes light-emitting component carry out light emission operation by the predetermined luminance rate sequence except that the non-luminosity rate sequence of the current path that flows through driving transistors in advance; With
The second potential difference (PD) step, according to non-luminosity rate sequence signal, control terminal and produce current value between current path one end of driving transistors of first potential difference (PD) in the first potential difference (PD) step has the light emission drive current that makes from driving transistors and makes light-emitting component become the current value of non-luminance.
The first potential difference (PD) step current path of pre-charge current that can flow to driving transistors, the current value of this pre-charge current, be enough to make light-emitting component to carry out light emission operation by the brightness degree sequence higher than the predetermined luminance rate sequence except that the non-luminosity rate sequence in cycle precharge time, and this first potential difference (PD) step can comprise precharge step, thereby gathers the electric charge that equals the high brightness level sequence between the control terminal of driving transistors and current path one end.
The first potential difference (PD) step current path of correcting current that can flow to driving transistors, the current value of this correcting current, be enough to make light-emitting component by than carrying out light emission operation in the lower brightness degree sequence of the high brightness level sequence of correct operation time cycle, and this first potential difference (PD) step can comprise aligning step, thereby part is released in the electric charge that gathers between the control terminal of driving transistors and current path one end.
According to a thirteenth aspect of the invention, provide a kind of display unit, comprising:
Light-emitting component; With
The a plurality of display pixels that comprise light emission drive circuit, this light emission drive circuit has emission control device, electric charge stacking device and voltage setting device respectively, this emission control device is used to make light emission drive current to flow to light-emitting component from current path, this electric charge stacking device is used to gather and the current value corresponding charge that flows through the electric current of emission control device, and this voltage setting device is used for gathering the electric charge that equals the predetermined luminance rate sequence at the electric charge stacking device; With
The rate sequence setting device, this grade sequence setting device is used for supplying non-luminosity rate sequence signal to display pixel, and be released in the electric charge that equals the predetermined luminance rate sequence that gathers in the electric charge stacking device, equal to make light-emitting component to become the light emission drive current of the current value of non-luminance up to the electric charge that makes light-emitting component, perhaps light emission drive current is not flowed up to the electric charge that makes light-emitting component
Wherein this display pixel comprises light-emitting component and light emission drive circuit, and this light emission drive circuit has emission control device, electric charge stacking device and voltage setting device.This display unit has display pixel and rate sequence setting device.
This display pixel can be provided with light-emitting component and light emission drive circuit.This light emission drive circuit preferably has electric charge stacking device and voltage setting device, and display unit has display pixel and rate sequence setting device.
This grade sequence setting device can be via data line, unless supply non-luminosity rate sequence signal and the rate sequence signal that equals the brightness degree sequence outside the luminosity rate sequence to display pixel selectively.
This non-luminosity rate sequence signal can be the voltage signal of scheduled voltage, unless and the rate sequence signal that equals the brightness degree sequence outside the luminosity rate sequence be the current signal of predetermined current value.
This grade sequence setting device can flow pre-charge current to emission control device, thereby in the electric charge stacking device, gather the electric charge that equals the high brightness level sequence, the current value of this pre-charge current is enough to make light-emitting component to carry out light emission operation by the brightness degree sequence higher than the predetermined luminance rate sequence except that the non-luminosity rate sequence in cycle precharge time.
This voltage setting device can flow correcting current to emission control device, thereby part is released in the electric charge that gathers in the electric charge stacking device, the current value of this correcting current is enough to make light-emitting component by carrying out light emission operation except that the predetermined luminance rate sequence the non-luminosity rate sequence of correct operation in the time cycle.
This emission control device can be provided with control terminal, and can have driving transistors, in this driving transistors, the current value of light emission drive current is set by the potential difference (PD) between control terminal and current path one end.
This emission control device can be provided with control terminal, and can have driving transistors, this driving transistors is at flow in the time cycle light emission drive current of this current value of light emission operation, its current value based on as the rate sequence signal in the write operation time cycle, flow through the current value of the write current of this current path.
This emission control device can be provided with control terminal, and can have driving transistors, and the voltage in the zone that wherein reaches capacity puts on an end and the other end thereof of this current path.
This voltage setting device can be provided with current control device and driving transistors device for selection controlling, this current control device is connected between current path one end and rate sequence setting device of driving transistors, is used to control the electric current that flows through the drive transistor current path; This driving transistors device for selection controlling is connected to the control terminal of driving transistors, is used for the transistorized selection mode of controlling and driving.
This current control device can have the selection transistor that control terminal wherein is connected to selection wire, and this driving transistors device for selection controlling can have the maintenance transistor that control terminal wherein is connected to retention wire.
This current control device can be provided with to be selected driver and keeps driver, this selection driver is used for selecting signal to current control device via selection wire output, and this maintenance driver is used for via retention wire output holding signal to the driving transistors selecting arrangement.
Select signal and holding signal to differ from one another.
Can also be provided for giving the supply voltage driver of the current path other end supply supply voltage of emission control device via supply voltage line.
This grade sequence setting device can be exported the current path of pre-charge voltage to luminous control flow apparatus via data line, thereby flow pre-charge current, the current value of this pre-charge current is unless be enough to make light-emitting component to carry out light emission operation by the brightness degree sequence higher than the predetermined luminance rate sequence outside the luminosity rate sequence.
The 14 aspect according to the present invention provides a kind of display drive method of display unit, thereby makes the light-emitting component execution of a plurality of display pixels of arranging with line direction and column direction luminous, and this display drive method comprises:
The first potential difference (PD) step, between current path one end of control terminal and driving transistors, produce first potential difference (PD), make that regardless of the brightness degree sequence signal electric current of this current value also makes the light-emitting component of display pixel carry out light emission operation by the predetermined luminance rate sequence except that the non-luminosity rate sequence of the current path that flows through driving transistors in advance; With
The second potential difference (PD) step, according to non-luminosity rate sequence signal, in the first potential difference (PD) step, produce current path one end of driving transistors of first potential difference (PD) and the current value between the control terminal and have the light emission drive current that makes from driving transistors and make light-emitting component become the current value of non-luminance.
The first potential difference (PD) step current path of pre-charge current that can flow to driving transistors, the current value of this pre-charge current, be enough to make light-emitting component to carry out light emission operation by the brightness degree sequence higher than the predetermined luminance rate sequence except that the non-luminosity rate sequence in cycle precharge time, this first potential difference (PD) step can also comprise precharge step, thereby gathers the electric charge that equals the high brightness level sequence between the control terminal of driving transistors and current path one end.
The first potential difference (PD) step current path of correcting current that can flow to driving transistors, the current value of this correcting current, be enough to make light-emitting component by than carrying out light emission operation in the lower brightness degree sequence of the high brightness level sequence of correct operation time cycle, and this first potential difference (PD) step can comprise aligning step, thereby part is released in the electric charge that gathers between the control terminal of driving transistors and current path one end.
This precharge step can be set to selection mode by a plurality of simultaneously display pixels, and this aligning step multirow display pixel simultaneously is set to nonselection mode, thereby first potential difference (PD) is set to equal low-light level voltage.
The second potential difference (PD) step can with the non-luminosity rate sequence signal sequence of scheduled voltage flow to the current path of the driving transistors of display pixel, make this display pixel become non-luminance.
The second potential difference (PD) step can sequentially flow to the brightness degree sequence signal of predetermined current value the current path of the driving transistors of display pixel, makes this display pixel become luminance.
According to the present invention, into control device and voltage-operated device can be arranged so that can lingeringly the not flow state of light emission drive current of emission control device.
According to light emission drive circuit of the present invention, select transistor and keep transistor by controlling respectively, driving transistors can be set, thereby lingeringly flow light emission drive current.
Drive controlling method according to this light emission drive circuit, in the step that sets in advance first potential difference (PD), light emission drive circuit is set to the threshold voltage of transistor unit, perhaps is set to equal to produce the voltage of the required minimum brightness rate sequence of light emission drive current when making light-emitting component carry out light emission operation by the minimum brightness rate sequence.Therefore, easily this light emission drive circuit is set to and the corresponding suitably brightness degree sequence of video data.
According to display unit of the present invention, into control device and voltage-operated device can be arranged so that can lingeringly the not flow state of light emission drive current of emission control device.
According to display unit of the present invention, select transistor and keep transistor by controlling respectively, driving transistors can be set, thereby lingeringly flow light emission drive current.
The drive controlling method of display unit according to the present invention, in the step that sets in advance first potential difference (PD), light emission drive circuit is set to the threshold voltage of transistor unit, perhaps is set to equal to produce the voltage of the required minimum brightness rate sequence of light emission drive current when making light-emitting component carry out light emission operation by the minimum brightness rate sequence.Therefore, easily this light emission drive circuit is set to and the corresponding suitably brightness degree sequence of video data.
Description of drawings
Fig. 1 is the circuit structure diagram that illustrates according to the embodiment of light emission drive circuit of the present invention;
Fig. 2 is the sequential chart that illustrates according to first example of the drive controlling operation of the light emission drive circuit of this embodiment;
Fig. 3 A and 3B illustrate according to the light emission drive circuit of this embodiment conceptual scheme in the example of operation (precharge operation/threshold value correct operation) of different conditions;
Fig. 4 A and 4B illustrate according to the light emission drive circuit of this embodiment conceptual scheme in the example of operation (write operation/light emission operation) of different conditions;
Fig. 5 illustrates according to the current characteristics of the light emission drive circuit of this embodiment and the curve map of voltage characteristic;
Fig. 6 is the curve map that the transient response of voltage between the grid of thin film transistor (TFT) in time cycle of threshold value correct operation and the source electrode is shown;
Fig. 7 is the curve map that the transient response of voltage between the drain electrode of thin film transistor (TFT) in time cycle of threshold value correct operation and the source electrode is shown;
Fig. 8 be illustrated in example according to the drive controlling method contrast of the light emission drive circuit of this embodiment in, the curve map of the variation tendency of the relative rate sequence electric current of light emission drive current;
Fig. 9 A and 9B be illustrated under the different situation of the threshold voltage of driving transistors, in the drive controlling method according to the light emission drive circuit of this embodiment, the curve map of the variation tendency of the relative input rank sequence of output level sequence;
Figure 10 is the sequential chart that illustrates according to second example of the drive controlling operation of the light emission drive circuit of this embodiment;
Figure 11 A and 11B illustrate according to the light emission drive circuit of this embodiment conceptual scheme in the example of operation (precharge operation/voltage correction operation) of different conditions;
Figure 12 A and 12B illustrate according to the light emission drive circuit of this embodiment conceptual scheme in the example of operation (write operation/light emission operation) of different conditions;
Figure 13 is the sequential chart that illustrates according to the 3rd example of the drive controlling operation of the light emission drive circuit of this embodiment;
Figure 14 A and 14B illustrate according to the light emission drive circuit of this embodiment conceptual scheme in the example of operation (write operation/light emission operation) of different conditions;
Figure 15 is the schematic diagram that illustrates according to the integrally-built example of the display unit of this embodiment;
Figure 16 illustrates the schematic diagram that is applied to according to the example of the display panel of the display unit of this embodiment and peripheral circuit thereof;
Figure 17 illustrates the schematic diagram that can be applied to according to the example of the data driver of the display unit of this embodiment;
Figure 18 illustrates the schematic diagram that can be applied to the example that the rate sequence signal generator according to the data driver of this embodiment divides;
Figure 19 is the schematic diagram that the structure that can be applied to the major part of dividing according to the rate sequence signal generator of this embodiment data driver is shown;
Figure 20 is the sequential chart that illustrates according to the example of the display drive method of the display unit of this embodiment;
Figure 21 is the circuit structure diagram that illustrates according to another light emission drive circuit of this embodiment;
Figure 22 is the schematic diagram that illustrates according to the major part of prior art light-emitting component escope; With
Figure 23 is the equivalent circuit diagram that the composition example of light-emitting component (illuminating circuit and the luminous terminal) escope according to prior art is shown.
Embodiment
Describe in detail according to light emission drive circuit of the present invention and drive controlling method and display unit and display drive method thereof below with reference to embodiment.
＜light emission drive circuit 〉
Describe at first, with reference to the following drawings according to light emission drive circuit of the present invention and drive controlling method thereof.
Fig. 1 is the circuit structure diagram that illustrates according to the embodiment of light emission drive circuit of the present invention.
As shown in Figure 1, for example, light emission drive circuit DC according to the present invention is configured to have: select transistor (apparatus for controlling) Tr 12, keep transistor (voltage-operated device) Tr 11, driving transistors (emission control device) Tr 13 and capacitor (electric charge stacking device and capacity cell) Cs, this selection transistor Tr 12 is by being positioned at each other near the configuration of the thin film transistor (TFT) each intersection point of a plurality of selection wire SL of arranged at right angles and a plurality of data line DL, wherein gate terminal (control terminal) is connected to selection wire SL, and source terminal and drain terminal (end and the other end of current path) are connected respectively to data line DL and contact N12; Keep transistor (voltage-operated device) Tr 11 to dispose by thin film transistor (TFT), wherein gate terminal is connected to the retention wire HL that is arranged in parallel with selection wire SL, and drain terminal and source terminal are connected respectively to supply voltage Vsc and output to wherein supply voltage line VL and contact N11; Driving transistors (emission control device) Tr 13 wherein is respectively that gate terminal is connected to contact N11 by the thin film transistor (TFT) configuration, and drain terminal is connected to supply voltage line VL, and source terminal is connected to contact N12; Capacitor Cs is connected (that is, between the gate terminal and source terminal of driving transistors Tr 13) between contact N11 and the contact N12.In organic EL (current-control type light-emitting component) OEL, anode terminal is connected to the contact N12 of light emission drive circuit DC, and common voltage Vcom puts on cathode terminal.The current potential of common voltage Vcom is set, makes it equal in write operation period of time T wr (back will illustrate) current potential, or be higher than and select magnitude of voltage Vs as the selection magnitude of voltage Vs of supply voltage Vsc.And, the current potential of common voltage Vcom is set, make it lower than the current potential as the luminous voltage value Ve of supply voltage value Vsc among the light emission operation period of time T em (back will illustrate).
Here, capacitor Cs can be the stray capacitance that forms between the grid of driving transistors Tr 13 and source electrode, perhaps can form by the capacity cell that also is connected in parallel except that stray capacitance between contact N11 and the contact N12.In addition, transistor Tr 11 to Tr 13 is not particularly limited.But,, can use n channel-type non-crystalline silicon tft by constitute all crystals pipe Tr 11 to Tr 13 by n channel-type thin film transistor (TFT).In this case, by using the amorphous silicon manufacturing technology that has formed, can make the stable light emission drive circuit of its operating characteristic with relatively easy manufacturing process.In addition, drive its luminous light-emitting component by light emission drive circuit DC and be not limited to organic EL OEL shown in Figure 1.If it is the current-control type light-emitting component, this light-emitting component can be other light-emitting component, for example light emitting diode.
In other words, light emission drive circuit DC according to this embodiment disposes in the following manner, promptly basis will soon put on the signal level of the control signal (following with holding signal and the selection signal described) of retention wire HL and selection wire SL respectively, operation keeps transistor Tr 11 and selects transistor Tr 12 respectively, makes its conducting and ends.
As shown in Figure 1, light emission drive circuit DC according to this embodiment disposes the signal drive circuit SDR that is connected to data line DL, signal drive circuit SDR is provided with selectively and gives light emission drive circuit DC supply organic EL OEL not luminous and become any conduct that shows slinkingly among non-luminous display voltage (rate sequence voltage) Vzero that shows (the black demonstration) and be used to make organic EL OEL to carry out the device of the rate sequence signal of light emission operation by the brightness degree sequence by the luminous rate sequence electric current I data of predetermined luminance rate sequence or organic EL OEL, signal drive circuit SDR also is provided with and was used for before the operation that writes the rate sequence signal, give light emission drive circuit DC supply pre-charge voltage Vpre, as the device of the control voltage of the element characteristic that is used to proofread and correct above-mentioned driving transistors Tr 13 (threshold voltage characteristic), the current potential of this pre-charge voltage Vpre fully is lower than the selection magnitude of voltage Vs in write operation period of time T wr.Here, described in the drive controlling method that is about to describe as the back, signal drive circuit SDR is provided with the switchgear SM of switch control, feasible rate sequence signal with rate sequence electric current I data or non-luminous display voltage Vzero is supplied to data line DL in write operation period of time T wr, and is supplied to data line DL in the precharge operation period of time T pre that pre-charge voltage Vpre is about to describe in the back.
The drive controlling method of＜light emission drive circuit 〉
(grade shows: (1))
Below, below description is had first example of drive controlling method of the light emission drive circuit of said structure (rate sequence display operation).
Fig. 2 is the sequential chart of the current value of potential difference (PD) between the anti-end of current potential, capacitor Cs of current potential, the supply voltage Vsc of current value that data line DL is shown, the current potential of selecting signal Ssel, holding signal Shld and the light emission drive current Iem that flows through organic EL OEL.Fig. 3 A and 3B are the conceptual schemes that the example of operation (precharge operation/threshold value correct operation) according to the light emission drive circuit of this embodiment is shown.Fig. 4 A and 4B are the conceptual schemes that illustrates according to the example of operation (write operation/light emission operation) of the light emission drive circuit of this embodiment.
As shown in Figure 2, by being set, light emission drive circuit make it comprise that precharge operation period of time T pre, threshold value correct operation period of time T th, write operation period of time T wr and light emission operation period of time T em carry out the drive controlling operation according to the light emission drive circuit of this embodiment, in precharge operation period of time T pre, in the capacitor Cs of light emission drive circuit DC, gather predetermined electric charge; In threshold value correct operation period of time T th, part is released in the electric charge that gathers among the precharge operation period of time T pre in the capacitor Cs of light emission drive circuit DC, keep the electric charge among the capacitor Cs to equal the threshold value of the drain-to-source electric current I ds of driving transistors Tr 13, and keep this electric charge; In write operation period of time T wr, apply rate sequence signal via data line DL, and in capacitor Cs, write electric charge corresponding to video data corresponding to video data; In light emission operation period of time T em, according to the electric charge that gathers among the capacitor Cs, make organic EL by carrying out light emission operation with the corresponding brightness degree sequence of video data, make in a cycle of treatment Tcyc, apply predetermined pre-charge voltage Vpre via data line DL from signal drive circuit SDR, (absolute value of the voltage Vpre13 of driving transistors Tr 13 arrives the absolute value of source voltage Vth13 greater than grid to source voltage Vpre13 with the grid that obtains driving transistors Tr 13.In the N channel transistor, voltage Vpre13 is higher than threshold voltage vt h13) (Tcyc 〉=Tpre+Tth+Twr+Tem).
Here, the grid of driving transistors Tr 13 when the threshold voltage of the drain-to-source electric current I ds of above-mentioned driving transistors Tr 13 is separatrix between following two kinds of situations is to source voltage, i.e. separatrix between the situation that the drain-to-source electric current I ds of situation that the drain-to-source electric current I ds of driving transistors Tr 13 begins to flow and driving transistors Tr 13 does not begin to flow.In addition, a cycle of treatment Tcyc is in a two field picture, for a pixel, in order to make the required time cycle of display pixel EM display image.Thereby showing under the situation of two field picture display image in a frame by a plurality of display pixel EM are arranged as horizontal and vertical matrix, cycle of treatment Tcyc be in a frame the required time cycle of delegation's image in delegation's display pixel EM display image.When departing from the write operation period of time T wr that writes each row of data, can in multirow, obtain precharge operation period of time T pre and threshold value correct operation period of time T th simultaneously, and can in multirow, obtain light emission operation period of time T em simultaneously.
To describe above-mentioned each cycle running time below in detail.
(precharge operation time cycle)
At first, in precharge operation period of time T pre, shown in Fig. 2 and 3A, selection signal (write control signal) Ssel and holding signal (voltage control signal) Shld of conduction level (when keeping transistor Tr 11 and Tr 12 to be n channel-type thin film transistor (TFT) is high level) put on selection wire SL and retention wire HL, and electronegative potential selects the supply voltage Vsc of magnitude of voltage Vs to put on the supply voltage line VL of light emission drive circuit DC.Selecting magnitude of voltage Vs can be the voltage that is no more than common voltage Vcom, for example can be earth potential.In addition, regularly synchronous with this, the switchgear SM output pre-charge voltage Vpre of signal drive circuit SDR is to data line DL.
Fig. 5 be illustrate when in n channel-type thin film transistor (TFT) with the curve map of the drain-to-source electric current I ds characteristic of predetermined grid when source voltage Vgs modulates drain-to-source voltage Vds.Here, if replace thin film transistor (TFT) with driving transistors Tr 13, transverse axis can be represented the dividing potential drop of organic EL OEL and the dividing potential drop of the organic EL OEL that connects with driving transistors Tr 13, and transverse axis can be illustrated in the drain electrode of driving transistors Tr 13 and the current value of the electric current I ds between the source electrode.In the accompanying drawings, dash line is represented the separatrix of the grid of driving transistors Tr 13 to source threshold voltage.In this case, undersaturated scope is represented in marginal left side, and saturation range is represented on the right side.Solid line represent respectively with the grid of thin film transistor (TFT) to source voltage Vgs be fixed as maximum brightness modulation voltage Vgsmax, Vgs1 (＜Vgsmax) and Vgs2 (＜Vgs1) time during the drain-to-source voltage Vds of modulation thin film transistor (TFT), the characteristic of drain-to-source electric current I ds.Dotted line is the EL load line when thin film transistor (TFT) replaces with driving transistors Tr13.The voltage on EL load line right side becomes the dividing potential drop (being 20V) at supply voltage Vsc organic EL OEL during to the voltage of common voltage Vcom in this accompanying drawing, the left side of EL load line equals the drain-to-source voltage Vds of driving transistors Tr 13.The current value increase of the drain-to-source electric current I ds of driving transistors Tr 13 (being rate sequence electric current I data) is many more, and the dividing potential drop of organic EL OEL increases manyly more gradually.
In this unsaturated scope, the grid of hypothesis driven transistor Tr 13 is fixed to source voltage Vgs, and the drain-to-source voltage Vds of driving transistors Tr 13 increases many more, and the current value of drain-to-source voltage Ids increases manyly more.On the other hand, in saturation range, the grid of hypothesis driven transistor Tr 13 is fixed to source voltage Vgs, even drain-to-source voltage Vds increases, the drain-to-source electric current I DS of driving transistors Tr 13 does not increase much yet, and is almost fixing.
Also will in precharge operation period of time T pre, put on the drain electrode of driving transistors Tr 13 and the pre-charge voltage Vpre between the source electrode and fully be lower than selection magnitude of voltage Vs in write operation period of time T wr.In addition, pre-charge voltage Vpre is configured such that the grid of driving transistors Tr 13 reaches the saturated current potential of transistor shown in Figure 5 to source voltage Vgs, i.e. the drain-to-source voltage Vds of driving transistors Tr 13 scope that reaches capacity.
If holding signal Shld from retention wire HL output conduction level, constitute maintenance transistor Tr 11 conductings that are provided with among the light emission drive circuit DC of display pixel EM, and supply voltage Vsc is via keeping transistor Tr 11 to put between the grid of driving transistors Tr 13 and the end of capacitor C s (contact N11).Selection signal Ssel from selection wire SL output conduction level.Therefore, select transistor Tr 12 conductings, and the data line DL that is applied in pre-charge voltage Vpre is via selecting transistor Tr 12 and the source electrode of driving transistors Tr 13 and the other end (contact N12) electric connection of capacitor Cs.
Here, the pre-charge voltage Vpre that is about to put on data line DL from signal drive circuit SDR in precharge operation period of time T pre is set to satisfy following equation (1):
|Vs-Vpre|＞Vth12+Vth13 ...(1)
Wherein Vth12 is when conduction level selects signal Ssel to put on the grid of selecting transistor Tr 12, selects the drain-to-source threshold voltage of transistor Tr 12.In addition, because in precharge operation period of time T pre, the grid of driving transistors 13 and drain electrode all are applied in selects magnitude of voltage Vs, so they have same basically current potential.Therefore, Vth13 is the threshold voltage of the drain-to-source voltage of transistor Tr 13, or the grid of driving transistors Tr 13 is to source threshold voltage. simultaneously, Vth12+Vth13 rises in time, and it has the potential difference (PD) of Vs-Vpre, thereby always satisfies equation (1).
Therefore, put on the anti-end (promptly between the grid and source electrode of driving transistors Tr 13) of capacitor Cs greater than the potential difference (PD) Vpre13 of the threshold value Vth13 of driving transistors Tr 13.Thereby, between the drain electrode and source electrode of driving transistors Tr 13, flow to signal drive circuit SDR from supply voltage line VL forcibly with the corresponding pre-charge current Ipre of electric current greatly of this driving transistors pre-charge voltage Vpre13.Therefore, accumulate in the anti-end (promptly charging into driving transistors pre-charge voltage Vpre13 (the 3rd potential difference (PD))) of capacitor Cs immediately corresponding to electric charge with the corresponding potential difference (PD) Vc of pre-charge current Ipre.Simultaneously, in the time cycle, not only electric charge accumulates among the capacitor Cs at precharge operation, and gathers electric charge and make pre-charge current Ipre also flow other electric capacity of the electric current route from supply voltage line VL to data line DL.
In this case, (=common voltage Vcom Vs) puts on the cathode terminal of organic EL OEL to be no more than electronegative potential supply voltage Vsc.Therefore, the anode of organic EL OEL and the state between the negative electrode are set to reverse-bias state or do not have electric field status, so light emission drive current do not flow through organic EL, and do not carry out light emission operation.
(the threshold value correct operation time cycle }
Below, among the threshold value correct operation period of time T th after precharge operation period of time T pre finishes, shown in Fig. 2 and 3B, the selection signal Ssel that puts on selection wire SL becomes cut-off level (low level), conduction level holding signal Shld puts on retention wire HL, therefore keep transistor Tr 11 can keep conducting state, select transistor Tr 12 to end.Therefore, the other end (contact N12) with the electric capacitor Cs that isolates of data line DL is set to high-impedance state.
In this case, (the current potential Vc of anti-end＞Vth13), driving transistors Tr 13 keeps conducting states by accumulate in electric charge among the capacitor CS in above-mentioned precharge operation period of time T pre.Therefore, in the grid voltage that keeps driving transistors Tr 13, electric current can flow between the drain electrode of driving transistors Tr 13 and source electrode.Therefore, driving transistors Tr 13 source terminal side (contact N12; Another terminals side of capacitor Cs) current potential increases gradually, thereby near drain terminal side (supply voltage line VL side).
Therefore, as shown in Figure 6, the grid of driving transistors Tr 13 reduces to source voltage Vgs, the electric charge that gathers in capacitor C13 partly discharges, at last, the grid of driving transistors Tr 13 changes to source voltage Vgs, thereby reduces (=converge) threshold voltage vt h13 (first potential difference (PD)) to driving transistors Tr 13.In addition, as shown in Figure 7, the drain-to-source electric current I ds of driving transistors Tr 13 reduces, and last drain-to-source electric current I ds changes, thereby has linearity.
Fig. 6 be illustrate according to present embodiment, in the time cycle of a subthreshold correct operation curve map of the transient response of voltage between the grid of thin film transistor (TFT) and the source electrode.Fig. 7 be illustrate according to present embodiment, in the time cycle of a subthreshold correct operation curve map of the transient response of electric current between the drain electrode of thin film transistor (TFT) and the source electrode.
In these results, employing has the light emission drive circuit DC of component structure as shown in table 1 and element characteristic, is illustrated in potential difference (PD) with logarithmically calibrated scale | and driving transistors Tr 13 grids that Vs-Vpre| observes when being set to 10V and 6.5V are to the transient response of source voltage Vgs and the transient response of drain-to-source electric current I ds.Simultaneously, capacitance Ct is the summation of the electric capacity of capacitor Cs and other stray capacitances of producing in light emission drive circuit DC.
Table 1 (structure of light emission drive circuit DC)
The grid capacitance Cin of driving transistors Tr 13 1.62E-01Ff/μm 2
The grid width W of driving transistors Tr 13 1200μm
The grid capacitance Cin of driving transistors Tr 13 1.62E-01Ff/μm 2
The grid length L of driving transistors Tr 13 7μm
Potential difference (PD) | Vs-Vpre| 10V/6.5V
The threshold voltage vt h13 of driving transistors Tr 13 1.5V
Capacitor C t 20pF
The rate sequence number 256
High-high brightness rate sequence voltage Vmsb 6.53V
Glow current under the high-high brightness rate sequence 1.20E-05A/dot(MSB)
Glow current under the minimum brightness rate sequence 4.68E-08A/dot(LSB)
In Fig. 6 and 7, Spa is illustrated in above-mentioned potential difference (PD) | and Vs-Vpre| is set to that grid is to the characteristic line of the variation tendency of source voltage Vgs under the situation of 10V, and SPb is illustrated in potential difference (PD) | and Vs-Vpre| is set under the situation of 6.5V grid to the characteristic line of the variation tendency of source voltage Vgs.According to such as driving transistors Tr 13 with select the increase of transistor Tr 12 and the temporary transient variation that reduces, the potential difference (PD) 3.5V supposition of 10V and 6.5V is along with the grid of driving transistors Tr 13 and the time of the dividing potential drop between the source electrode change.In addition, when making organic EL OEL carry out light emission operation by high-high brightness rate sequence (MSB), Vmsb is that the grid of driving transistors Tr 13 is to source voltage Vgs.Imsb is the drain-to-source electric current I ds (light emission drive current Iem) of driving transistors Tr 13.Ilsb is when making organic EL OEL carry out light emission operation by minimum brightness rate sequence (LSB) in non-rate sequence luminous, the drain-to-source electric current I ds (light emission drive current Iem) of driving transistors Tr 13.
In this case, in the thin film transistor (TFT) shown in the table 1, as shown in Figure 6, proof is no matter the potential difference (PD) that produces in above-mentioned precharge operation period of time T pre | Vs-Vpre| how, grid to source voltage Vgs (the anti-terminal potential Vc of capacitor Cs) about 3msec be reduced in the time of 4msec (3000 μ sec are to 4000 μ sec) threshold voltage value Vth13 (=1.5V).In addition, as shown in Figure 7, proof is no matter the potential difference (PD) that produces in above-mentioned precharge operation period of time T pre | and Vs-Vpre| is how, drain-to-source voltage Ids drops to current value 4.68E-8A (in the curve map at Fig. 6, grid is reduced to about 2.0V to source voltage Vgs) at about 50 μ sec in the time of 200 μ sec.
In this threshold value correct operation period of time T th, because the current potential of the anode terminal of organic EL OEL (contact N12) is with identical at the common voltage Vcom of card terminals side (card terminal side), or its current potential is less than the common voltage Vcom in the card terminals side, be not applied to organic EL OEL so there is current potential, apply reverse bias voltage perhaps for organic EL OEL, and organic EL OEL does not carry out light emission operation.
(write operation time cycle)
Below, among the write operation period of time T wr after threshold value correct operation period of time T th finishes, carry out the process shown in Fig. 2 and the 4A.That is to say, be applied to on-line selection signal Ssel once more, make holding signal Shld remain on conduction level continuously at selection wire SL, and display pixel EM be except that with synchronous non-luminous of this timing rate sequence situation about showing under, the switchgear SM of signal drive circuit SDR can be along being provided with rate sequence electric current I data with the corresponding direction of arrow of video data, thereby flow into signal drive circuit SDR via data line from supply voltage line VL.In addition, under the situation that the luminous rate sequence of display pixel EM right and wrong shows, the switchgear SM of signal drive circuit SDR can export non-luminous display voltage Vzero to data line DL, wherein makes the grid of driving transistors Tr13 be no more than this threshold value to source voltage.
In this case, normal level sequence display operation (rate sequence that makes organic EL OEL carry out light emission operation shows) will be described now, non-light emission operation will be described in the back, (not making organic EL OEL carry out the rate sequence display operation of light emission operation).
Therefore, when selecting transistor Tr 12 conductings and carry out when discharging the operation of rate sequence electric current I data via data line DL, current potential more is lower than supply voltage Vsc, and (voltage of=Vs) low pressure puts on contact N12 (another of the source terminal of driving transistors Tr 13 and capacitor Cs is distolateral).Simultaneously, via the electronegative potential supply voltage Vsc that keeps transistor Tr 11 to give one distolateral (the contact N11) of capacitor Cs applying supply voltage line VL (=Vs).
Here, the rate sequence electric current I data grid required, driving transistors Tr 13 that flows between the drain electrode of driving transistors Tr 13 and source electrode is threshold voltage vt h13 to the maximum voltage component in the source voltage.Especially in minimum brightness voltage Vlsb, the ratio of the electric charge that threshold voltage vt h13 needs in whole electric charges surpasses 50%.Attempt only by write operation, and, charge into electric charge to reach this threshold voltage vt h13, promptly not according to precharge operation and the threshold value correct operation of this embodiment, by current value is the so little electric current of about rate sequence electric current I data, can make write operation period of time T wr longer.Therefore, make the hardwood cycle that shows an image longer, thereby lose good display characteristic.But, according to present embodiment, in the capacitor Cs that is connected to contact N11 and contact N12 (between the grid and source electrode at driving transistors Tr 13), make electric charge keep equaling the threshold voltage vt h13 of driving transistors Tr 13 by above-mentioned precharge operation and threshold value correct operation.Therefore, in addition in the short relatively time by approximately being the Weak current of rate sequence electric current I data, also can between the drain electrode of driving transistors Tr 13 and source electrode, charge into and make rate sequence electric current I data stablize required electric charge.
Therefore, driving transistors Tr 13 is set, thereby by output is not Weak current (minutecurrent) and the pre-charge voltage Vpre that satisfies equation (1), force also to reach immediately driving transistors pre-charge voltage Vpre 13 than threshold voltage vt h13 higher (being the absolute value of its absolute value) greater than threshold voltage vt h13, and in threshold value correct operation period of time T th, the grid of controlling and driving transistor Tr 13 pools threshold voltage vt h13 to source voltage.Therefore, shown in Fig. 4 A, flow to signal drive circuit SDR via driving transistors Tr 13, contact N12, selection transistor Tr 12 and data line DL from supply voltage line VL immediately with the corresponding write current Ia of the current value of rate sequence electric current I data.
In other words, as shown in Figure 6, in threshold value correct operation period of time T th, the electric charge that equals the threshold voltage vt h13 of driving transistors Tr 13 accumulates among the capacitor Cs.Therefore, except charged state, charge into the electric charge of rate sequence electric current I data (write current Ia) correspondent voltage component Vdata needs just enough.Even the threshold voltage vt h13 of driving transistors Tr 13 is owing to luminous history and element characteristic or the like change, also can write fast enough rightly with rate sequence signal (video data) correspondent voltage component Vdata. here, voltage the Vc (=V α that in capacitor Cs, charge into; Second potential difference (PD)) becomes summation with threshold voltage Vh13 correspondent voltage component Vdata and rate sequence electric current I data, V α=Vth13+Vdata.
In this case, electronegative potential supply voltage Vsc (=Vs) put on supply voltage line VL, in addition, control write current Ia makes it flow from the direction of supply voltage line at data line DL via light emission drive circuit DC.Therefore, make the current potential of the anode terminal (contact N12) that will put on organic EL OEL be not more than the current potential Vcom of cathode terminal, and reverse bias voltage put on organic EL OEL.Therefore, light emission drive current does not flow through organic EL OEL, and does not carry out light emission operation.
(light emission operation time cycle)
Below, among the light emission operation Tem after write operation period of time T wr finishes, shown in Fig. 2 and 4B, cut-off level selects signal Ssel and holding signal Shld to put on selection wire SL and retention wire HL together.Regularly synchronous with this, the pulling process (drawing operation) of the rate sequence electric current I data that is caused by signal drive circuit SDR stops, and apply for supply voltage line VL to be not less than to make organic EL OEL carry out the magnitude of voltage Ve (being positive voltage) of the required anode voltage of light emission operation, as noble potential supply voltage Vsc about the order deviation of the voltage Vcom that is connected to organic EL OEL cathode side by the high-high brightness rate sequence.This luminous voltage value Ve is than selecting the higher current potential of magnitude of voltage Vs.
Particularly, luminous voltage value Ve is set to satisfy the current potential of following equation (2):
|Ve-Vcom|＞Vdsmax+Velmax...(2)
Wherein, Vdsmax is when flowing this grade sequence electric current I data with the high-high brightness rate sequence, in light emission operation period of time T em, reach the drain electrode of driving transistors Tr 13 of saturation range shown in Figure 5 and the lowest high-current value between the source electrode at the drain electrode of driving transistors Tr 13 and the voltage between the source electrode.The drain-to-source electric current (rate sequence electric current I data) of driving transistors Tr 13 can be set to source voltage uniquely by the grid of driving transistors Tr 13 as a result.In other words, drain-to-source voltage (rate sequence electric current I data) that can be by driving transistors Tr 13, the grid that driving transistors Tr 13 is set uniquely is to drain voltage, i.e. the amount of charge of gathering in capacitor C3.Velmax is the dividing potential drop of organic EL OEL when the high-high brightness rate sequence.
Because in the light emission operation period of time T em of driving transistors Tr 13, the drain-to-source voltage of driving transistors Tr 13 is positioned at saturation range, so Vds is set to satisfy the voltage of following equation (3).
|Ve-Vcom|＞Vds≥Vth13...(3)
In other words, if the drain-to-source voltage Vds of driving transistors Tr 13 is lower than threshold value Vth13 in light emission operation period of time T em, do not satisfy equation (3), the drain-to-source electric current I ds of driving transistors Tr 13 just can not be set to source voltage uniquely by the grid of driving transistors Tr 13.
If | Ve-Vcom| is constant, and the brightness degree sequence raises manyly more, | Vds-Vth| just reduces manyly more.In other words, if Vdsmax satisfies following equation (4), regardless of rate sequence, in light emission operation period of time T em, the drain-to-source voltage of driving transistors Tr 13 always is positioned at saturation range.
|Ve-Vcom|＞Vdsmax≥Vth13max...(4)
Simultaneously, in Fig. 5, Ve-Vcom is defined as 20V, and still, present embodiment is not limited to this.
For maintenance transistor Tr 11 and selection transistor Tr 12 that light emission drive circuit DC is provided with are ended, and capacitor Cs remains on the electric charge that gathers among the above-mentioned write operation period of time T wr.
Therefore because in write operation capacitor Cs keep charging voltage V α (=Vth13+Vdata), so the grid that keeps driving transistors Tr 13 is to the source voltage Vgs (voltage of contact N11; Driving voltage), and driving transistors Tr 13 keep conductings.
Therefore, shown in Fig. 4 B, in light emission operation period of time T em, light emission drive current Iem flows in the direction of organic EL OEL via driving transistors Tr 13 and contact N12 from supply voltage line VL, and organic EL OEL is by luminous with the corresponding predetermined luminance rate sequence of the current value of light emission drive current Iem.Here, in light emission operation period of time T em, remain on electric charge (being charging voltage Vc) among the capacitor Cs equal in driving transistors Tr 13, to flow potential difference (PD) under the situation of write current Ia of corresponding rate sequence electric current I data.Therefore, the current value (Iem is Ia=Idata no better than) that flows through the light emission drive current Iem of organic EL OEL equals above-mentioned write current Ia (rate sequence electric current I data).Therefore, according to the component of voltage V α that in write operation period of time T wr, writes (maintenance), the light emission drive current Iem of the corresponding predetermined luminance (brightness degree sequence) of supply, and organic EL OEL can be by expecting accordingly that with video data (rate sequence electric current I data) the brightness degree sequence is luminous continuously.
Like this, light emission drive circuit and drive controlling method thereof according to present embodiment, adopt in the following way in the electric current designation system and carry out luminous drive controlling method by the predetermined luminance rate sequence, promptly in the write operation time cycle, between the drain electrode and source electrode of driving transistors Tr 13, supply the rate sequence electric current I data (write current Ia) of sign forcibly with the corresponding current value of organic EL OEL luminance (brightness degree sequence), and according to and its grid of driving transistors Tr 13 of the corresponding maintenance of current value and the component of voltage between the source electrode, the light emission drive current Iem of organic EL OEL is flow through in control.In addition, by the single transistor (driving transistors Tr 13) that is used for light emitting drive, realize following two functions, to be converted to the function (electric current and voltage conversion function) of voltage level with the current level of the corresponding rate sequence electric current I data of predetermined video data (brightness degree sequence), and the light emission drive current Iem that will have a predetermined current value is supplied to the function of organic EL OEL.Therefore, can realize the characteristics of luminescence of expecting long-term and stably, and not for example operating characteristic change and constitute the influence of each transistorized transient changing of light emission drive circuit DC.
In addition,, enter at video data before the write operation and organic EL OEL light emission operation of display pixel EM, carry out precharge operation according to the light emission drive circuit and the drive controlling method thereof of present embodiment.Therefore, Weak current unlike rate sequence electric current I data, but equal to surpass the electric charge of the driving transistors pre-charge voltage Vpre13 of transistor threshold voltage Vth13, once accumulated in the capacitor Cs that connects between the grid that is provided with among the light emission drive circuit DC, be used for transistor (driving transistors Tr 13) and the source electrode forcibly with pre-charge voltage Vpre light emitting drive.Then, by carrying out the threshold value correct operation, driving transistors Tr 13 makes driving transistors Tr 13 be reduced to each threshold value Vth13 by selecting transistor Tr 12.Therefore, after the threshold value correct operation finishes, can in the capacitor Cs of each light emission drive circuit DC, gather the electric charge of the threshold value Vth13 that equals light emission drive circuit DC driving transistors Tr13, and keep it.
Like this, even the threshold value Vth13 of each driving transistors Tr 13 changes, also can in the threshold value correct operation, charge into threshold value Vth13 corresponding charge rightly with each driving transistors Tr 13.Then, in the write operation of video data, needn't make it equal threshold voltage vt h13 by rate sequence electric current I data to capacitor Cs charging according to video data, and only need to increase and gather (charging) this component of voltage Vdata according to this video data (rate sequence electric current I data).Therefore, can gather (charging) soon in capacitor Cs based on the electric charge of video data, and can prevent to lack to write.Therefore, can make organic EL OEL by carrying out light emission operation with the corresponding suitably brightness degree sequence of video data.
Particularly, in adopting the light emission drive circuit of electric current designation system as shown in this embodiment, in write operation (in the present embodiment, this electric current of pulling in light emission drive circuit DC), will be supplied to the current value of the rate sequence electric current I data (write current Ia) of light emission drive circuit DC to be approximately equal to the light emission drive current Iem that flows through organic EL OEL.Therefore, (when making organic EL OEL carry out light emission operation by the low brightness levels sequence) makes the current value of the rate sequence electric current I data that will offer signal drive circuit SDR very little when carrying out display operation by the low brightness levels sequence.
On the other hand, usually define time that write operation allowed (back will be described in detail with reference to the example application of display unit) according to the specification (number of frame time and sweep trace) of display panel in advance to display pixel (light emission drive circuit).
Therefore, at precharge operation and the threshold value correct operation do not carried out according to present embodiment, and supply and the corresponding rate sequence electric current I of video data data in the write operation time cycle, and form under the situation of predetermined potential (equaling the anti-end of capacitor Cs) between the grid and source electrode that are used for the transistor of light emitting drive (equaling driving transistors Tr 13), at first, must gather the electric charge that is used for transistorized threshold voltage vt h13.Therefore, showing under the corresponding small rate sequence electric current I data with the low brightness levels sequence, between this transistorized grid and source electrode, (for example do not gather corresponding threshold voltage vt h13 and other electric capacity, the stray capacitance of data line DL and select the threshold voltage vt h12 of transistor Tr 12) enough electric charges, this causes supplying for light-emitting component (organic EL OEL) and has the situation with the light emission drive current Iem of the corresponding current value of this rate sequence electric current I data.
Therefore, in the low brightness levels sequence scope shown in the circle in Fig. 8, by with rate sequence electric current I data (the write current Ia that will be supplied to light emission drive circuit DC; The input rank sequence) current value of the light emission drive current Iem (output level sequence) that relevant organic EL OEL is shared shows non-linear.This makes can't be to carry out light emission operation with the corresponding suitably brightness degree sequence of video data.
On the contrary, according to light emission drive circuit of the present invention and drive controlling method thereof, before the write operation of video data, the drive controlling light emission drive circuit is carried out precharge operation and threshold value correct operation, equals at the grid of driving transistors (transistor that is used for light emitting drive) Tr 13 and the electric charge of the threshold voltage between the source electrode (the anti-end of capacitor Cs) thereby gather.Therefore, for example, shown in Fig. 9 A and 9B, even in low brightness levels sequence scope, with input rank sequence (rate sequence electric current I data; Write current Ia) relevant output level sequence (light emission drive current Iem; Luminosity) shows good linearity; Therefore can be to carry out light emission operation with the corresponding suitably brightness degree sequence of video data.
Especially, light emission drive circuit and drive controlling method thereof according to this embodiment, shown in Fig. 9 A and 9B, even the threshold voltage vt h13 that confirms driving transistors Tr 13 is owing to transient changing and luminous history or the like change (variation), the output level sequence relevant with the input rank sequence also shows sublinear (sublinearity).Fig. 8 is in the example that illustrates with according to the drive controlling method contrast of the light emission drive circuit of this embodiment, the curve map of the variation tendency of the relative rate sequence electric current of light emission drive current, Fig. 9 A and 9B are in the drive controlling method that is illustrated in according to the light emission drive circuit of this embodiment, the curve map of the variation tendency of the relative input rank sequence of output level sequence.In Fig. 9 A and 9B, transverse axis is represented the rate sequence according to rate sequence electric current I data, and the longitudinal axis represents that dotted line is represented ideal value according to the rate sequence value of the light emission drive current Iem of rate sequence electric current I data generation.In this case, Fig. 9 A is illustrated under the original state that does not change in the threshold voltage of driving transistors Tr 13, and the output level sequential value is with respect to the curve map of the variation tendency of input rank sequential value.Fig. 9 B is illustrated in the threshold voltage of driving transistors Tr 13 because under the state of transient changing and mobile 4V, the output level sequential value is with respect to the curve map of the variation tendency of input rank sequential value.Like this, the inferior grade sequence is flat down unlike Fig. 8, and can obtain the linear light emission drive current Iem about rate sequence electric current I data.
(the drive controlling method of light emission drive circuit)
(rate sequence shows: (2))
Below, second example (rate sequence display operation) that description is had the drive controlling method in the illuminating circuit of this structure.
Figure 10 is the current value that is illustrated in according to the data line DL in second example of the drive controlling operation of the light emission drive circuit of this embodiment, select the current potential of signal Ssel, the current potential of holding signal Shld, the current potential of supply voltage Vsc, potential difference (PD) in the anti-end of capacitor Cs, and the sequential chart of the current value of light emission drive current Iem. Figure 11 A and 11B are the conceptual schemes that the example of operation (precharge operation/voltage correction operation) according to the light emission drive circuit of this embodiment is shown. Figure 12 A and 12B are the conceptual schemes that illustrates according to the example of operation (write operation/light emission operation) of the light emission drive circuit of this embodiment. here, with reference to the Drive and Control Circuit (Fig. 1) shown in this embodiment, simple declaration is equivalent to first example (Fig. 2 here, 3A, the control operation of the drive controlling method 3B and 4).
According to the drive controlling method shown in first example, the display driver control method, in this drive controlling method, after the capacitor Cs that connects between as the grid of transistorized driving transistors Tr13 that is used for light emitting drive and source electrode charges into the precharge operation period of time T pre of driving transistors pre-charge voltage Vpre13, be provided with charging voltage that threshold value correct operation period of time T th is used for calibrating capacitor Cs, make this charging voltage be reduced to the threshold voltage vt h13 of driving transistors Tr 13 from driving transistors pre-charge voltage Vpre13.But the present invention is not limited to the method.
According to the drive controlling method shown in first example, explained the situation that adopts following method, promptly before write operation, between grid that is used for the transistor of light emitting drive (driving transistors Tr 13) and source electrode (capacitor Cs), gather the quantity of electric charge that equals threshold voltage vt h13; And add all electric charges to equal threshold voltage vt h13 the quantity of electric charge, and gather their as the electric charge that is used for producing light emission drive current Iem by the rate sequence Idata that will in write operation, provide.In this case, in precharge operation period of time T pre, between the grid of driving transistors Tr 13 and source electrode, apply voltage, and gather electric charge therein above threshold voltage vt h13.Then, in threshold value correct operation period of time T th, discharge this electric charge, drop to threshold voltage vt h13 up to voltage.Therefore, if the voltage and the difference voltage between the threshold voltage vt h13 that apply between the grid of driving transistors Tr 13 and source electrode are big, threshold value correct operation period of time T th is just elongated.
According to present embodiment, according to this technological thought, as shown in figure 10, by being set, light emission drive circuit carries out the drive controlling method, this light emission drive circuit is set makes it comprise precharge operation period of time T pre, voltage correction running time period T vt, write operation period of time T wr and light emission operation period of time T em, in precharge operation period of time T pre, in a cycle of treatment period of time T cyc, in the capacitor Cs of light emission drive circuit DC, gather electric charge based on driving transistors pre-charge voltage Vpre13; In voltage correction running time period T vt, part is released in the electric charge that gathers among the capacitor Cs, and in the grid of driving transistors Tr 13 and the capacitor Cs between the source electrode, keep and to equal to make organic EL OEL to carry out to produce the electric charge of the voltage (minimum brightness voltage Vlsb) of light emission drive current Iem when luminous, and keep this electric charge with minimum brightness rate sequence (unless its brightness luminous outside minimum rate sequence); In write operation period of time T wr, according to electric charge being write among the capacitor Cs with the corresponding rate sequence signal of video data (rate sequence electric current I data); In light emission operation period of time T em,, make organic EL carry out light emission operation (Tcyc 〉=Tpre+Tth+Tvt+Twr+Tem) with the predetermined luminance rate sequence according to the electric charge that in capacitor Cs, gathers.
Here, cycle of treatment period of time T cyc is by arranging that along horizontal and vertical a plurality of display pixel EM show under the situation of a two field picture in matrix, shows required time cycle of delegation's image in the two field picture in order to make the display pixel EM of delegation.Leaving write operation period of time T wr is every row when writing data, can obtain precharge operation period of time T pre and voltage correction running time period T vt simultaneously in multirow, can obtain light emission operation period of time T em simultaneously in multirow.
In other words, adopt this drive controlling method, after the switchgear SM of signal drive circuit SDR output pre-charge voltage Vpre gives the precharge operation period of time T pre of data line DL, and before moving to following write operation period of time T wr, between grid that is used for the transistor of light emitting drive (driving transistors Tr 13) and source electrode (capacitor Cs), gather electric charge, in this write operation period of time T wr, the switchgear SM of signal drive circuit SDR is not equal to threshold voltage vt h13 flow for the value of the rate sequence electric current I data of data line DL, but equals the voltage (minimum brightness voltage Vlsb) of generation light emission drive current when with minimum brightness rate sequence execution light emission operation.
Particularly, as shown in figure 10, be arranged on the voltage correction running time period T vt that carries out after the precharge operation time cycle, thereby stop the voltage correction operation, and at the grid of driving transistors Tr 13 shown in Figure 6 in the variation tendency of source voltage Vgs (the anti-terminal voltage of capacitor Cs), with in the variation tendency of the drain-to-source voltage Ids of driving transistors Tr 13 shown in Figure 7 (light emission drive current Iem), when being able to light emission drive current the Iem (=Ilsb that when carrying out light emission operation, flows by minimum brightness rate sequence (about 100 to 200 μ sec); 4.68E-08A) grid to source voltage Vgs (=minimum brightness voltage Vlsb; First potential difference (PD)) time, moves to write operation period of time T wr subsequently.
This drive controlling method according to light emission drive circuit, among the voltage correction running time period T vt after precharge operation period of time T pre, only need once with the driving transistors pre-charge voltage Vpre13 that charges among the capacitor Cs, (=Ilsb) corresponding minimum brightness voltage Vlsb, this minimum brightness voltage Vlsb is the higher voltage of threshold voltage vt h13 (voltage that promptly has big absolute value) than driving transistors Tr13 to be reduced to and to make organic EL OEL to carry out the required light emission drive current Iem of light emission operation (display operation) with the minimum brightness rate sequence.Therefore, the potential difference (PD) between driving transistors pre-charge voltage Vpre13 and minimum brightness voltage Vlsb is less than the potential difference (PD) between driving transistors pre-charge voltage Vpre13 and threshold voltage vt h13.This causes voltage correction running time period T vt than the shorter fact of threshold value correct operation period of time T th.For example, if adopt the driving transistors Tr13 of the grid shown in Fig. 6 and 7 to source voltage Vgs (the anti-terminal voltage Vc of capacitor Cs) variation tendency, (about 3 to 4 μ sec) compare with the time that is reduced to threshold voltage vt h13 up to voltage, can reduce the required time (about 100 to 200 μ sec) of correct operation of charging voltage in large quantities.
In addition, in voltage correction running time period T vt, not only electric charge accumulates among the capacitor Cs, and gathers electric charge and make rate sequence electric current I data also flow electric capacity except capacitor Cs, other electric current routes from supply voltage line VL to data line DL.Therefore, even gather small rate sequence electric current I data according to video data among the write operation period of time T wr below, also can pass through electric current I data, to be used for producing the electric charge of light emission drive current Iem immediately, increase to the electric charge that equals the minimum brightness voltage Vlsb that in capacitor Cs, gathers, and gather (writing) component of voltage Vdata of corresponding video data rightly fast and fully.
Therefore, operate among the cycle of treatment period of time T cyc of (light emission operation of light-emitting component) the required time of correct operation of the charging voltage Vc (grid is to source voltage Vgs) of the capacitor Cs that can shorten before write operation period of time T wr and light emission operation period of time T em, carries out in drive controlling according to light emission drive circuit.This makes it possible to be provided with the light emission operation period of time T em of light-emitting component long relatively, thereby improves luminosity, and is the same with example shown in Figure 9, thereby prevents reducing of in low brightness levels sequence scope luminosity, and keeps linear.
(the drive controlling method of light emission drive circuit (non-luminous demonstration))
Subsequently, the 3rd example (non-luminous display operation) that description is had the drive controlling method in the light emission drive circuit of this structure.
Figure 13 is the current value that illustrates according to the data line DL of the 3rd example of the drive controlling operation of the light emission drive circuit of this embodiment, select the current potential of signal Ssel, the current potential of holding signal Shld, the current potential of supply voltage Vsc, the potential difference (PD) of the anti-end of capacitor Cs, and the sequential chart of current value that flows through the light emission drive current Iem of organic EL OEL. simultaneously, in data line DL, flow to the write current Ia of pre-charge current Ipre, opposite mutually with the direction of the anti-terminal potential Vc of the capacitor Cs that becomes 0V owing to non-luminous display voltage Vzero (back will illustrate). Figure 14 A and 14B are the conceptual schemes that illustrates according to the example of operation (write operation/light emission operation) of this embodiment light emission drive circuit., simple declaration is equivalent to first and second example (Fig. 2 here in this, 3A, 3B, the control operation of the drive controlling method 10 and 11).
In first and second example, all be in case change to light emission operation period of time T em from write operation period of time T wr, supply voltage Vsc just replaces with noble potential luminous voltage value Ve from electronegative potential selection magnitude of voltage Vs.Therefore, migration for example keeps the electric charge of the stray capacitance of transistor Tr 11, and improves the grid potential of driving transistors Tr 13.According to first and second example, even in the voltage correction running time of previous cycle of treatment period of time T cyc period T vt, the charging voltage Vc that in capacitor Cs, writes be positioned at threshold voltage vt h13 near, light emission drive current Iem also flows by this small grid potential conversion, and non-light emission operation potentially unstable.Therefore, preferably this charging voltage Vc is discharged fully, and the grid of driving transistors Tr 13 is set to 0V (contact N11 and contact N12 have same potential) to source voltage Vgs.By carrying out under the situation of this write operation with rate sequence electric current I data with Weak current value, need the long relatively time of cost, up to write current Ia vanishing, and the electric charge of capacitor Cs is released.Especially in the voltage correction running time of previous cycle of treatment period of time T cyc period T vt, the charging voltage Vc that writes among the capacitor Cs is more near high-high brightness rate sequence voltage Vmsb, the quantity of electric charge that keeps in capacitor Cs is many more, therefore needs the longer time of cost.
According to the drive controlling method shown in above-mentioned first example, this method is before write operation, the capacitor Cs that connects between as the grid of transistorized driving transistors Tr 13 that is used for light emitting drive and source electrode gathers the electric charge that is equivalent to threshold voltage vt h13.Therefore, as shown in Figure 6, grid is reduced to the long relatively time of about 3msec of threshold voltage vt h13 needs to source voltage Vgs (anti-end ' current potential Vc of capacitor Cs).In addition, in order in light emission operation period of time T em, to realize non-luminous display operation, thereby make organic EL keep non-luminance, must be by the rate sequence electric current I data that will supply among the write operation period of time T wr of (promptly after 3msec) after threshold value period T correction time th finishes, the voltage that will charge in capacitor Cs (anti-terminal potential Vc) is set to the value less than threshold voltage vt h13.
Similarly, the drive controlling method according to shown in second example adopts following method, promptly before write operation, among the capacitor Cs that connects, gathers the electric charge that is equivalent to minimum brightness voltage Vlsb between the grid of driving transistors Tr 13 and source electrode.Therefore, as shown in Figure 6, the operation of the charging voltage Vc of calibrating capacitor Cs can roughly reduce to about 100 to 200 μ sec.But, in order to realize non-luminous display operation, must be by the rate sequence electric current I data that in write operation period of time T wr, supplies, the voltage that will charge in capacitor Cs (anti-terminal potential Vc) is set to the value less than threshold voltage vt h13.
Therefore, according to present embodiment, as shown in figure 13, by being set, light emission drive circuit make it comprise that precharge operation period of time T pre, voltage correction running time period T vt, write operation period of time T wr and light emission operation period of time T em carry out this drive controlling method, in this precharge operation period of time T pre, in a cycle of treatment period of time T cyc, in the capacitor Cs of light emission drive circuit DC, gather electric charge according to pre-charge voltage Vpre; In voltage correction running time period T vt, in the electric charge that in part releasing capacitor Cs, gathers, keep the electric charge that is equivalent to minimum brightness voltage Vlsb, perhaps be equivalent to the electric charge of threshold voltage vt h13, and keep it; In write operation period of time T wr, apply and the corresponding rate sequence signal of non-luminous display data (non-luminous display voltage Vzero), and be released in the most of electric charge that keeps among the capacitor Cs; In light emission operation period of time T em, prevent that organic EL OEL from carrying out light emission operation (making organic EL OEL carry out non-light emission operation) (Tcyc 〉=Tpre+Tvt+Twr+Tem).
In other words, identical with the embodiment shown in first example or second example, adopt this drive controlling method, in precharge operation before write operation period of time T wr and the voltage correction operation, the electric charge that will between grid that is used for the transistor of light emitting drive (driving transistors Tr 13) and source electrode (capacitor Cs), gather, be set to be equivalent at once the value of threshold voltage vt h13, perhaps be set to be equivalent to the value that is used for when carrying out light emission operation, producing the voltage (minimum brightness voltage Vlsb) of light emission drive current by minimum brightness rate sequence (LSB), and in write operation subsequently, shown in Figure 14 A, by via data line DL, directly apply the non-luminous display voltage Vzero that equals as the selection magnitude of voltage Vs of supply voltage Vsc from signal drive circuit SDR to light emission drive circuit DC (contact N12), grid is set to 0V to source voltage Vgs (the anti-terminal potential Vc of capacitor Cs).
Therefore, be released in the nearly all electric charge that gathers among the capacitor Cs, and the grid of driving transistors Tr 13 is set to fully be lower than the magnitude of voltage (approximately 0V) of threshold voltage vt h13 to source voltage Vgs.Therefore, even select magnitude of voltage Vs to be converted to noble potential luminous voltage value Ve from electronegative potential at supply voltage Vsc when write operation period of time T wr becomes light emission operation period of time T em, and the grid potential of driving transistors Tr 13 increases a little, and the grid of driving transistors Tr 13 also is lower than threshold voltage vt h13 fully to source voltage.Therefore, as shown in Figure 14B, driving transistors Tr 13 not conductings (remain off state), and light emission drive current Iem is not supplied to organic EL OEL, therefore do not carry out light emission operation (becoming non-luminance).
Here, the same with the embodiment shown in first example or second example, when grid in write operation period of time T wr when source voltage Vgs reaches threshold voltage vt h13 or minimum brightness voltage Vlsb, the timing that applies non-luminous display voltage Vzero from signal drive circuit SDR to light emission drive circuit DC is set.Therefore, this timing is set in the following manner, promptly among the voltage correction running time period T vt after precharge operation, for example, when starting correct operation, the end voltage correct operation period of time T vt in the curve map shown in Figure 6 and moving to after the write operation period of time T wr about 100 to 200 μ sec,, apply non-luminous display voltage Vzero.
Therefore, can reduce execution precharge operation and required time of voltage correction operation before this write operation in large quantities.In addition, with when non-luminous display operation (non-light emission operation) via data line DL supply and the corresponding rate sequence electric current of non-luminous display data and be released in the grid of driving transistors Tr 13 and source electrode between the situation of nearly all electric charge of gathering among the capacitor Cs that is connected compare, the required time of the write operation of the non-luminous display data of a large amount of minimizings, realize that preferably non-luminous display operation is possible.Therefore, except the normal level sequence display operation of embodiment shown in first example or second example, can also come switch to control the 3rd the non-luminous display operation in the example illustrated embodiment according to video data, and this makes and can realize the light emission operation of anticipated number rate sequence (for example 256 rate sequences) with high relatively brightness and sharpness.
Particularly, according to first example, in precharge operation period of time T pre, the switchgear SM of signal drive circuit SDR shown in Figure 1 can export pre-charge voltage Vpre to data line DL.Then, among the write operation period of time T wr after threshold value correct operation period of time T th, when the luminous demonstration of video data right and wrong, switchgear SM can export non-luminous display voltage Vzero to data line, and when video data is luminous demonstration, can carry out switch, make rate sequence electric current I data flow through data line DL.
Similarly, according to second example, in precharge operation period of time T pre, the switchgear SM of signal drive circuit SDR shown in Figure 1 can export pre-charge voltage Vpre to data line DL.Then, among the write operation period of time T wr after voltage correction running time period T vt, when the luminous demonstration of video data right and wrong, switchgear SM can export non-luminous display voltage Vzero to data line DL, and when video data is luminous demonstration, can carry out switch, make rate sequence electric current I data flow through data line DL.
In addition, with reference to being provided with three transistor Tr 11 circuit structure as light emission drive circuit DC as shown in Figure 1 to Tr 13, embodiment shown in each example (drive controlling method) is described. still, obviously the present invention is not limited to this, as long as it is and the corresponding light emission drive circuit of electric current designation system, and it can realize electric current and voltage conversion function and light emitting drive function, other circuit structure also is fine, this electric current and voltage conversion function are used to utilize single thin film transistor (TFT), to according to the rate sequence current conversion of video data supply component of voltage, and accumulate in this component of voltage in the capacitor that connects between grid and the source electrode or in the stray capacitance, this light emitting drive function is used for according to the component of voltage that gathers, and control is supplied to the light emission drive current of light-emitting component (organic EL).
(display unit)
Below, a kind of display unit and display drive method thereof will be described with reference to the drawings, this display unit is provided with the display panel with a plurality of display pixels, and this display pixel has the light emission drive circuit with matrix arrangements.
Figure 15 is the schematic diagram that illustrates according to the integrally-built example of the display unit of this embodiment.Figure 16 illustrates the schematic diagram that will be applied to according to the example of the display panel of the display unit of this embodiment and peripheral circuit (select driver, keep driver and supply voltage driver) thereof.Here, description is provided with the display unit of the function of carrying out the non-luminous display operation shown in the rate sequence display operation shown in above-mentioned first or second example and the 3rd example selectively.In addition, for the purpose of simplifying the description, be equivalent to the structure (light emission drive circuit of this display pixel; Referring to Fig. 1) identical or suitable Reference numeral or the mark of employing.
Shown in Figure 15 and 16, configuration comprises display panel 110 according to the display unit 100 of present embodiment; Select driver 120; Keep driver 130; Data or signal driver 140; Supply voltage driver 150; System controller 160; Retentive control signal, data controlling signal and power control signal are also exported them; And shows signal produces circuit 170, this display panel 110 be arranged to n by a plurality of displayed image capable * matrix that m row (n, m are positive integer) are arbitrarily formed, this display panel 110 is provided with its circuit structure light emission drive circuit DC identical with this embodiment and organic EL (light-emitting component) OEL, and this organic EL OEL is located near a plurality of selection wire SL and each intersection point between vertical a plurality of data line DL that arrange of about lateral arrangement; This selection driver 120 is connected to the selection wire SL of this display panel 110, is used for applying sequentially for each selection wire SL by predetermined timing and selects signal (writing control terminal) Ssel; This maintenance driver 130 is connected in the horizontal the retention wire HL that arranges abreast with each selection wire SL, is used for sequentially applying holding signal (voltage control signal) Vhid by predetermined timing; Data or signal driver 140 are connected to the data line DL of display panel 110, be used at precharge operation Tpre, give display pixel EM supply pre-charge voltage Vpre via each data line DL, and in write operation period of time T wr, give display pixel EM supply and the corresponding rate sequence signal of video data (rate sequence electric current I data or non-luminous display voltage Vzero) via each data line DL; Supply voltage driver 150 is connected to the supply voltage line VL that is connected jointly with the whole display pixel EM that arrange in display panel 110, be used for applying predetermined supply voltage Vsc to supply voltage line VL; System controller 160 is used for producing the timing signal of circuit 170 supplies according to what the back was about to describe from shows signal, produce and select control signal, thereby driver 120 and the duty that keeps driver 130, data driver 140 and supply voltage driver 150 are selected in control at least; Shows signal produces circuit 170 and for example produces video data (brightness degree sequence data) according to the picture signal from display unit 100 outside supplies, and it is supplied to data driver 140, extract or produce timing signal (system clock or the like), being used on display panel 110, showing predetermined picture information, and it is supplied to system controller 160 according to video data.
To specifically describe every kind of configuration below.
(display panel)
The same with this embodiment (referring to Fig. 1), the display pixel EM that will arrange in display panel shown in Figure 16 110 is configured to have selection signal Ssel and holding signal Shld, rate sequence signal, light emission drive circuit DC and organic EL (light-emitting component) OEL, this selection signal Ssel is applied in via selection wire SL from selecting driver 120, and this holding signal Shld is applied in via retention wire HL from keeping driver 130; This grade sequence signal (rate sequence electric current I data or non-luminous display voltage Vzero) is supplied via data line DL from signal driver 140; This light emission drive circuit DC carries out in the precharge operation described in each drive controlling method and threshold value correct operation (or voltage correction operation), write operation and light emission operation according to the supply voltage Vsc that applies via supply voltage line VL from supply voltage driver 150; This organic EL OEL is according to the current value of the light emission drive current Iem that supplies from this light emission drive circuit DC, carry out light emission operation by the predetermined brightness rate sequence. simultaneously, according to present embodiment, the same with this embodiment (referring to Fig. 1), to the situation of organic EL OEL as light-emitting component that adopt be described. still, as long as it is to carry out the current-control type light-emitting component of light emission operation according to the current value of light emission drive current by the predetermined brightness rate sequence, other light-emitting component also is available.
(selection driver)
Select driver 120 according to the selection control signal from system controller 160 supplies, select signal Ssel by applying conduction level for each selection wire SL, every capable display pixel EM is set to selection mode.Display unit (back is described referenced drive control method (referring to Figure 20) in detail) according to this embodiment, at precharge operation in the time cycle, select signal Ssel to impose on multirow selection wire SL at least simultaneously, the preferred selection wire SL that imposes on all row simultaneously, the multirow of display panel 110, preferred all display pixel EM are set to selection mode simultaneously.On the other hand, in the panel write operation time cycle, select signal Ssel sequentially to put on every capable selection wire SL, therefore sequentially control every capable display pixel EM, be set to selection mode with it.
For example, as shown in figure 16, select driver 120 to be configured to have shift register 121 and output circuit part 122, this displacement resistor 121 is used for according to described later from the selection clock signal SCK of system controller 160 supplies and the selection initiating signal SST of conduct selection control signal, output and the corresponding switching signal of every capable selection wire SL sequentially; This output circuit part 122 is according to the output control signal SOE that selects control signal from the conduct of system controller 160 supplies, convert the shift signal of displacement resistor 121 outputs to prearranged signal level (conduction level), and export this shift signal and arrive each selection wire SL as selecting signal Ssel.
Here, in selection driver 120 according to present embodiment, especially output circuit part 122 is configured to have and sequentially exports the function (pattern) of sequentially selecting signal Ssel from displacement resistor 121 to every capable selection wire SL output switching signal as conduction level, with no matter how, all export the function (pattern) that conduction level selects signal Ssel preferably to give whole selection wire SL for multirow selection wire SL at least simultaneously from the switching signal of displacement resistor 121, and according to output control signal SOE, these functions are configured to can switch.
In other words, as described below, the operation of the every capable display pixel EM Class Of Supply sequence signal of arranging on giving display panel 110 and sequentially writing therein in the operation (panel write operation) of video data, output circuit part 122 is set to sequentially export the pattern of signal Ssel to each selection wire SL of selecting.Before the panel write operation, be preferred in whole display pixel EM, gather among the selection wire of the multirow at least SL that on display panel 110, arranges in the operation of (charging) and predetermined pre-charge voltage Vpre corresponding charge, output circuit part 122 be set to export simultaneously select signal Ssel give multirow selection wire SL at least, preferably to the pattern of whole selection wire SL.
(maintenance driver)
Keep driver 130 to give each retention wire HL by applying conduction level holding signal Shld according to the retentive control signal from system controller 160 supplies, maintenance applies the state of predetermined voltage for the gate terminal of every capable display pixel EM transistor that be provided with, that be used for light emitting drive (corresponding to the light emission drive circuit Tr 13 shown in this embodiment).
Display unit (in detail (referring to Figure 20) described the referenced drive control method in the back) according to this embodiment, in precharge operation time cycle and threshold value correct operation time cycle (or voltage correction time cycle), holding signal Shld imposes on multirow retention wire HL at least simultaneously, preferably then to all retention wire HL. that go, the multirow of display panel 110, preferred all display pixel EM are set to selection mode simultaneously. on the other hand, in the panel write operation time cycle, holding signal Shld sequentially puts on every capable retention wire HL, thereby sequentially control every capable display pixel EM, thereby keep being provided with to every capable display pixel EM, the transistorized grid voltage that is used for light emitting drive.
For example, as shown in figure 16, driver 120 is the same with selecting, keep driver 130 to be configured to have displacement resistor 131 and output circuit part 132, this displacement resistor 131 is used for according to from system controller 160 supply, maintenance clock signal HCK and maintenance initiating signal HST as the retentive control signal, output and the corresponding switching signal of every capable retention wire HL sequentially, this output circuit part 132 is according to the output control signal HOL as the retentive control signal provision, convert switching signal to prearranged signal level (conduction level), and export this switching signal and arrive each retention wire HL as holding signal Shld.
Here, in maintenance driver 130 according to present embodiment, output circuit part 122 especially is configured to have sequentially to be exported from the switching signal sequentially export of displacement resistor 121 to every capable retention wire HL, as the function (pattern) of conduction level holding signal Shld, with give multirow retention wire HL at least, preferably give the function (pattern) of whole retention wire HL no matter how, all export conduction level holding signal Shld simultaneously from the switching signal of displacement resistor 121, and according to output control signal HOE, these functional configuration are can switch.
In other words, as described below, the operation of the every capable display pixel EM Class Of Supply sequence signal of arranging on being used for to display panel 110 and sequentially write the operation (panel write operation) of video data therein, output circuit part 122 is set to sequentially export the pattern of holding signal Shld to each retention wire HL.Before discharging the electric charge gather in panel write operation and part, keeping the electric charge of corresponding threshold voltage vt h13 (or minimum brightness voltage Vlsb) and keep its operation, preferably in whole display pixel EM, gathering among the display pixel of the multirow at least EM that on display panel 110, arranges in the operation of (charging) and predetermined pre-charge voltage Vpre corresponding charge, output circuit part 122 be set to export holding signal Shld give multirow holding signal HL at least, preferably to the pattern of whole holding signal HL.
(data driver)
Figure 17 illustrates the schematic diagram that can be applied to according to the example of the data driver of the display unit of this embodiment.Figure 18 illustrates the schematic diagram that can be applied to the example that the rate sequence signal generator according to the data driver of this embodiment divides.Figure 19 illustrates the schematic diagram that can be applied to the major part structure that the rate sequence signal generator according to the data driver of this embodiment divides.Simultaneously, about the inner structure of data driver shown in Figure 17 to 19, applicable example only is shown, present embodiment is not limited to this.
As shown in figure 17, data driver 140 be configured to have the rate sequence signal generator divide 141 and pre-charge voltage supply with part 142, the rate sequence signal generator divides 141 according to the data controlling signal from system controller 160 supplies, by predetermined sequential, sequentially take out and produce by the described shows signal in back that the digital signal of circuit 170 supplies forms, the video data of every row (brightness degree sequence data), and keep it, when the rate sequence of video data is value except 0 bit (being non-luminous demonstration), produce the rate sequence electric current I data of the corresponding rate sequence value of current value, on the other hand, when the rate sequence value is the value (non-luminous demonstration) of 0 bit, generation is used to carry out specific voltage (the non-luminous display voltage) Vzero of non-luminous display operation, and, supply this specific voltage (specificvoltage) Vzero for simultaneously the every capable display pixel EM that in the panel write operation time cycle, is set to selection mode via each data line DL; Pre-charge voltage is supplied with part 142 according to the data controlling signal (precharging signal PCG) from system controller 160 supplies, control one end be connected to each data line DL transistor switch SWpr conducting and by operation, and, give the display pixel of the multirow at least EM of layout on the display panel 110 simultaneously, preferably give whole display pixel EM supplies predetermined pre-charge voltage Vpre. via each data line DL
Here, for example, as shown in figure 18, the rate sequence signal generator divides 141 to be configured to have shift register 41, data register circuit 42, data-latching circuit 43, non-luminous display voltage and to apply circuit 44, digital to analog converter 45 and electric current and voltage conversion and rate sequence current suppling circuit 46, shift register 41 is used for sequentially exporting switching signal according to the data controlling signal (change over clock signal (shift clock signal) CLK and sampling initiating signal (sampling start signal) STR) from system controller 160 supplies; Data register circuit 42 is used for the incoming timing according to this switching signal, sequentially take out from shows signal produce circuit 170 supplies, the video data D0 of delegation is to Dm; Data-latching circuit 43 is used for according to data controlling signal (data latch signal STB), keeps by data register circuit 42 video data D0 that take out, delegation to Dm; Non-luminous display voltage applies circuit 44 and is used to detect the non-luminous display data (the rate sequence value of 0 bit) of the video data D0 of free these data-latching circuit 43 maintenances to Dm, predetermined non-luminous display voltage Vzero is imposed on data line DL to row that should video data, and transmit video data D0 except non-luminous display data to Dm by itself pattern, and it is exported to the digital to analog converter 45 of next stage; Digital to analog converter 45 be used for according to from the rate sequence reference voltage V 0 of power supply device (omitting its explanation here) supply to VP, will apply the video data D0 that circuit 44 imports through non-luminous display voltage and convert predetermined analog signal voltage (rate sequence voltage Vpix) to Dm (except non-luminous display data); Electric current and voltage conversion and rate sequence current suppling circuit 46 are used to produce the rate sequence electric current I data of this replacement data (displace data) that correspondence is converted into analog signal voltage, and according to data controlling signal (output enabling signal OE), by the data line DL that regularly outputs it to row that should video data from system controller 160 supply.
Here, for example, as shown in figure 19, non-luminous display voltage applies that circuit 44 is configured to have non-luminous display data judgment part 44a and non-luminous display voltage produces part 44b, and non-luminous display data judgment part 44a is used for detecting and remains on the video data D0 that forms with the numerical data of the corresponding data-latching circuit 43 of each particular row has 0 bit levels sequence in Dm, as non-luminous display data video data; Non-luminous display voltage produces part 44b and is used for directly applying the data line DL that predetermined non-luminous display voltage Vzero gives the row that is defined as non-luminous display data, and this non-luminous display data is not through the digital to analog converter 45 of next stage and the electric current and voltage conversion and the rate sequence current suppling circuit 46 of next stage.
As according to as shown in the drive controlling method of the 3rd example, the electric charge that gathers between the grid of the transistor that is used for light emission operation (driving transistors Tr 13) by the light emission drive circuit DC that caused by precharge operation and threshold value correct operation (or voltage correction operation), discharge configuration display pixel EM and the source electrode, non-luminous display voltage produce the non-luminous display voltage Vzero that part 44b puts on data line DL and are configured such that grid becomes the necessary free voltage value of 0V (or making it approach 0V) to source voltage Vgs.
(supply voltage driver)
Only each display pixel EM (organic EL OEL) is arranged in the time cycle the display panel 110 according to the power control signal (supply voltage switching signal PWR) from system controller 160 supplies, supply voltage driver 150 ability are given multirow display element EM at least via the supply voltage Vsc that supply voltage line VL applies high level luminous voltage value Ve, preferably give whole display element EM, in other time cycle, supply voltage driver 150 applies low level and selects the supply voltage Vsc of magnitude of voltage Vs to give multirow display pixel EM at least, preferably gives whole display pixel EM.
In precharge operation time cycle, threshold value correct operation time cycle (or cycle voltage correction running time) and panel write operation time cycle, the supply voltage Vsc that low level is selected magnitude of voltage Vs imposes at least multirow display pixel EM, preferably gives whole display pixel EM from supply voltage driver 150,, be arranged in the display pixel of the multirow at least EM in the display panel 110, preferred all display pixel EM and be recharged simultaneously in the time cycle at precharge operation; In the threshold value correct operation time cycle (or cycle voltage correction running time), pre-charge voltage Vpre partly discharges and threshold value Vth13 (or minimum brightness voltage Vlsb) remains at least among multirow display pixel EM, the preferred all display pixel EM; In the panel write operation time cycle, the display pixel groups EM that every row sequentially is set is selection mode and writes rate sequence signal (rate sequence electric current I data or non-luminous display voltage Vzero (back will specifically describe)).
(system controller)
System controller 160 can each be selected driver 120 and keeps driver 130 by producing control, the selection control signal of the duty of data driver 140 and supply voltage driver 150, the retentive control signal, data controlling signal and power control signal, and export them and have predetermined voltage level with generation, rate sequence signal (rate sequence electric current I data, non-luminous display voltage Vzero) and the selection signal Ssel of supply voltage Vsc and holding signal Shld and export them, thereby with predetermined each driver of fixed cycle operator, and can in each display pixel EM (light emission drive circuit DC), carry out drive controlling operation (precharge operation continuously, threshold value correct operation (or voltage correction operation), panel write operation and light emission operation), thus demonstration is based on the predetermined image information of picture signal on display panel 110.
(shows signal generation circuit)
Shows signal produces circuit 170 can extract brightness degree sequence signal composition from the picture signal of for example display unit 100 outside supplies, and can supply the data register circuit 42 that this brightness degree sequence signal composition is given data driver 140, as the video data of forming by the digital signal of display panel 110 each row (brightness degree sequence data).Here, comprise in this picture signal under the situation of timing signal composition of the Displaying timer that limits the image information resemble TV broadcast singal (composite image signal), except the function of extracting brightness degree sequence signal composition, shows signal produces circuit 170 can also be had the timing signal composition of extraction and it is supplied to the function of system controller 160.In this case, system controller 160 can produce and offer each control signal of selecting driver 120 and keeping driver 130, data driver 140 and supply voltage driver 150 respectively according to producing the timing signal of circuit 170 supplies from shows signal.
(display drive method of display unit)
Below, with the display drive method of describing according to the display unit of present embodiment (display operation of image information).
Figure 20 is the sequential chart that illustrates according to the example of the display drive method of the display unit of this embodiment.Here, display operation with reference image information, be described in the situation of the drive controlling method shown in second example being applied in display pixel EM shown in this embodiment (light emission drive circuit DC) (referring to Fig. 1) in this embodiment display unit and the 3rd example, omit the explanatory note of the drive controlling method of equivalence here.
As shown in figure 20, by light emission drive circuit is set, make it comprise precharge operation period of time T Apr, voltage correction running time period T Avt, write operation period of time T Awr and light emission operation period of time T Aem, carry out drive controlling operation according to the display operation of the display unit 100 of present embodiment, in precharge operation period of time T Apr, by the display pixel of the multirow at least EM that will on display panel 110, show simultaneously, preferred all display pixel EM are set to selection mode, and in a frame time period T fr (being equivalent to a cycle of treatment period of time T cyc), the pre-charge voltage supply part 142 that is provided with from data driver 140 via data line DL applies predetermined pre-charge voltage Vpre, thereby gathers the electric charge of corresponding pre-charge voltage Vpre in each display pixel EM (light emission drive circuit DC); In voltage correction running time period T Avt, part is released in the electric charge that gathers among each display pixel EM, and when light-emitting component is arranged among each display pixel EM (organic EL OEL), keep the electric charge (equaling the voltage of driving transistors Tr 13) of the voltage (minimum brightness voltage) that the transistor equal to be used for light emitting drive is provided with, and keep this electric charge; In write operation period of time T Awr, display pixel EM by every line of demonstration on display panel 110 is set to selection mode, and divide 141 to apply rate sequence signal (rate sequence electric current I data or non-luminous display voltage Vzero) according to the rate sequence signal generator that video data is provided with from data driver 140 via data line DL, thereby in each display pixel EM, gather the electric charge of corresponding rate sequence signal; In light emission operation period of time T Aem,, make light-emitting component (organic EL) simultaneously by carrying out light emission operation with the corresponding brightness degree sequence of video data according to the electric charge that in each display pixel EM, gathers (Tfr TApr+TAvt+TAwr+TAem).Here, precharge operation period of time T Apr, voltage correction running time period T Avt, write operation period of time T Awr and light emission operation period of time T Aem are set and make that they each other can be temporarily not overlapping.
(precharge operation time cycle)
At first, in precharge operation period of time T Apr, as shown in figure 20, conduction level selects signal Ssel to impose on multirow display pixel EM, preferably give whole selection wire SL from selecting driver 120, thereby the selection wire of multirow at least that shows on display panel 110, preferred all display pixel EM are set to selection mode simultaneously.
In addition, regularly synchronous with this, power at very low levels voltage Vsc (=Vs) impose at least multirow display pixel EM, preferably give whole display pixel EM from supply voltage driver 150 via public supply voltage line VL, and conduction level holding signal Shld imposes at least multirow display pixel EM, preferably gives whole retention wire HL from keeping driver 130.Therefore, multirow display pixel EM, preferred all display pixel EM are set to hold mode (particularly, the voltage that is based on power at very low levels voltage Vsc is applied to the state on the grid of the transistor that is used for light emitting drive (driving transistors Tr 13) of configuration light emission drive circuit DC shown in Figure 1).
Then, with this regularly synchronously, the pre-charge voltage that predetermined pre-charge voltage Vpre is provided with from data driver 140 is supplied with part 142 and is imposed on multirow data line DL, preferably gives all of data lines DL.Therefore, electric charge that should pre-charge voltage Vpre accumulated among the multirow display pixel EM, accumulates preferentially among whole display pixel EM (particularly, be at configuration light emission drive circuit SC, be used between the grid and source electrode of transistor (driving transistors Tr 13) of light emitting drive; The anti-end of capacitor Cs (referring to the anti-terminal potential Vc of each display pixel among Figure 20)).
(cycle potential correction running time)
Below, in voltage correction running time period T Avt, as shown in figure 20, by keeping to impose on from supply voltage driver 150 the supply voltage Vsc of each display pixel EM of low level (Vs), and will impose on the selection driver 120 of the holding signal Shld of each the display pixel EM that remains on conduction level from keeping driver 130 from having, applying cut-off level selects signal Ssel to give multirow selection wire SL at least, preferably give whole selection wire SL, feasible multirow display pixel EM at least, preferred all display pixel EM are set to nonselection mode simultaneously.
Therefore, drive controlling method as shown in Figure 2 (is disposing light emission drive circuit DC, is being used between the transistorized grid and source electrode of light emitting drive in each display pixel EM; The anti-end of capacitor Cs) electric charge that gathers is partly discharged, and (the transistorized grid that is used for light emitting drive is to source voltage Vgs based on the current potential that gathers the electric charge of (maintenance) in each display pixel EM; The anti-terminal potential Vc of capacitor Cs) changes, thereby be reduced to the threshold voltage vt h13 of the transistor (driving transistors Tr 13) that is used for light emitting drive from pre-charge voltage Vpre.
Here, in voltage correction running time period T Avt, when the current potential that gathers the electric charge of (maintenance) based in each display pixel EM (the anti-terminal potential Vc of capacitor Cs) drops to magnitude of voltage (minimum brightness voltage Vlsb) when carrying out light emission operation by the minimum brightness rate sequence of the light-emitting component (organic EL OEL) that is provided with in each display pixel, this correct operation finishes, and moves on to following panel write operation.
In other words, because the operation of a series of precharge operations and voltage correction, and minimum brightness voltage Vlsb corresponding charge accumulates among the display pixel of the multirow at least EM that arranges on the display panel 110, preferably in whole display pixel EM (being used between the transistorized grid and source electrode of light emitting drive).
(panel write operation time cycle)
Subsequently, in panel write operation period of time T Awr, as shown in figure 20, conduction level selects signal Ssel sequentially from selecting driver 120 to impose on every capable selection wire SL, make that they each other can be temporarily not overlapping, and cut-off level selection signal Ssel imposes on the selection wire SL of remaining row, thereby every capable display pixel EM sequentially is set to selection mode.
In addition, with this regularly synchronously, conduction level holding signal Shld sequentially imposes on the retention wire HL of the row that is set to selection mode from keeping driver 130, and cut-off level holding signal Shld imposes on the retention wire HL of unselected row.Therefore, the display pixel EM for every row of selection mode sequentially is set to hold mode (based on power at very low levels voltage Vsc (=voltage Vs) puts on the state of the grid of the transistor (driving transistors Tr 13) that is used for light emitting drive).Simultaneously, after precharge operation period of time T Apr and voltage correction running time period T Avt, in panel write operation period of time T Awr, keep power at very low levels voltage Vsc (=Vs) impose on multirow display pixel EM at least, preferably give the state of whole display pixel EM from supply voltage driver 150.
Then, regularly synchronous with this, according to the rate sequence signal (rate sequence electric current I data or non-luminous display voltage Vzero) of the video data (numerical data) that produces circuit 170 supplies from shows signal, divide from the rate sequence signal generator that data driver 140, is provided with 141 to impose at least multirow data line DL, preferably give all of data lines DL.Therefore, in the display pixel EM of the row that is set to selection mode, (be used between the transistorized grid and source electrode of light emitting drive; The anti-end of capacitor Cs) charges into (writing) based on this rate sequence voltage of signals component.
Here, the same with the drive controlling method shown in second example and the 3rd example, being supplied to the video data of data driver 140 from shows signal generation circuit 170 is under the situation of the brightness degree sequence data (the rate sequence value except 0 bit) except non-luminous display data, produce by data driver 140 with the corresponding rate sequence electric current I of this video data data, thereby on the data line DL of corresponding row, flow.On the other hand, when the video data that produces circuit 170 supplies from shows signal was non-luminous display data (the rate sequence value of 0 bit), predetermined non-luminous display voltage Vzero was produced by data driver 140, thereby was supplied to the data line DL of corresponding row.
In Figure 20, in order to explain the state of those two kinds of rate sequence signals of supply, as an example, following situation is shown, wherein be supplied to first and the capable j row display pixel EM of n based on the rate sequence electric current I data of the brightness degree sequence data except non-luminous display data (the rate sequence value except 0 bit), in addition, be supplied to the display pixel EM of second row j row based on the non-luminous display voltage Vzero of non-luminous display data (the rate sequence value of 0 bit).
Therefore, be supplied among its display pixel EM at rate sequence electric current I data as the rate sequence signal, as shown in figure 20, except that and each display pixel EX of corresponding row in (between transistorized grid that is used for light emitting drive and source electrode) minimum brightness voltage Vlsb corresponding charge (current potential) of keeping, also gather electric charge (component of voltage Vdata) based on this rate sequence signal.Thereby between transistorized grid that is used for light emitting drive and source electrode, charge into α with this video data correspondent voltage V.
In addition, be supplied among its display pixel EM at rate sequence electric current I data as the rate sequence signal, as shown in figure 20, discharge and the corresponding nearly all electric charge of minimum brightness voltage Vlsb that in each display pixel EX of corresponding row, keeps, thereby between transistorized grid that is used for light emitting drive and source electrode, be provided with and this video data correspondent voltage (0V).
According to selecting signal Ssel to impose on the timing of every capable selection wire SL, repeat rate sequence signal writing operation to every capable display pixel EX.Therefore, video data (rate sequence signal) is written on the display panel 110 among the display pixel of the multirow at least EM that arranges, preferably in whole display pixel EM (referring to the anti-terminal potential Vc of the capacitor Cs of each display pixel in Figure 20)
(light emission operation time cycle)
Subsequently, in light emission operation period of time T Aem, as shown in figure 20, select signal Ssel to impose on each selection wire SL, and holding signal Shld impose on each retention wire HL of cut-off level from keeping driver 130 from selecting driver 120.Therefore, every capable display pixel EM is set to nonselection mode and non-hold mode.
In addition, regularly synchronous with this, by apply from supply voltage driver 150 high level supply voltage Vsc (=Ve) give at least multirow display pixel EM, preferably give whole display pixel EM, multirow display pixel EM, preferred all display pixel EM are set to luminance at least.
Therefore, component of voltage according to (between transistorized grid that is used for light emitting drive and source electrode) maintenance among each display pixel EM, produce and the corresponding light emission drive current Iem of this video data (rate sequence signal), thereby be supplied to light-emitting component (organic EL OEL).
In other words, therein among the corresponding display pixel EM of rate sequence signal (rate sequence electric current I data) and normal level series of operations (except non-luminous demonstration), produce its current value almost with this grade sequence electric current I data light emission drive current Iem much at one, thereby be supplied to light-emitting component (organic EL OEL).Then, by carrying out light emission operation (referring to the light emission drive current Iem among the display pixel EM of the row of the first row j in Figure 20) with the corresponding predetermined luminance rate sequence of this video data.
On the other hand, write therein among the display pixel EM with the corresponding rate sequence signal of non-luminous display operation (non-luminous display voltage Vzero), be set to be no more than threshold value (0V) because be used for the transistorized grid of light emitting drive to source voltage (the anti-terminal potential Vc of capacitor Cs), so do not give light-emitting component (organic EL OEL) supply light emission drive current Iem, and this light-emitting component keeps non-luminance (referring to the light emission drive current Iem among the second row j row display pixel EM in Figure 20).
Execution this type of light emission operation (or non-light emission operation) among the display pixel of the multirow at least EM that while arranges in display panel 110, among preferred all display pixel EM.Therefore, on display panel 110, show predetermined image information based on this picture signal.
Like this, display unit and display drive method thereof according to this embodiment, this embodiment is except the situation of non-luminous demonstration, supply is given each display pixel based on the rate sequence electric current I data of this video data (picture signal), and according to keep with the corresponding video data of this current value, control will be supplied to the light emission drive current of light-emitting component (organic EL), can adopt the drive controlling method of this electric current designation system, make light-emitting component by carrying out light emission operation with the corresponding predetermined luminance rate sequence of this video data.In addition, following two functions are provided, by the single transistor that is used for light emitting drive (driving transistors Tr 13) of giving each display element is set, the current level of rate sequence electric current I data is converted to the function (current/voltage-converted function) of voltage level and the function (light emitting drive function) that has the light emission drive current Iem of predetermined current value based on this voltage level supply.Therefore, can realize the characteristics of luminescence of expecting long-term and stably, and not change and the influence of the transient changing of the thin film transistor (TFT) of configuration light emission drive circuit in each display pixel such as operating characteristic.
In addition,, in each display pixel, write before the light emission operation of the write operation (panel write operation) of video data and light-emitting component, carry out the operation of precharge operation and voltage correction according to display unit and the display drive method thereof of this embodiment.Therefore, the transistor that can be used for light emitting drive is set to following state, promptly between grid that is used for the transistor of light emitting drive (driving transistors Tr 13) and source electrode, gather and keep equaling the electric charge of minimum brightness voltage in advance, the absolute value of the magnitude of voltage of this minimum brightness voltage is greater than the absolute value of this transistorized threshold voltage. the result, in the write operation of video data, needn't be by rate sequence electric current I data based on video data, between transistorized grid that is used for light emitting drive and source electrode (capacitor Cs), charge into the electric charge of its absolute value greater than the voltage of the absolute value of threshold voltage. in addition, only need to add and gather (charging) only with this video data (rate sequence electric current I data) correspondent voltage component Vdata, thereby can be fast and write component of voltage rightly based on this video data.
Therefore, even when showing with the very little low brightness levels sequence of the corresponding rate sequence of this video data, also can be fast and write component of voltage rightly based on this video data.Therefore, can not prevent in each display element, writing, and can be by showing the image information of expecting with the corresponding suitably brightness degree sequence of this picture signal.
In addition, when non-luminous demonstration, give each display pixel by the predetermined non-luminous display voltage Vzero that supplies based on this video data (picture signal), can be released in nearly all electric charge (component of voltage) that (capacitor Cs) keeps between the transistorized grid and source electrode that is used for light emitting drive.Therefore, the transistor that is used for light emitting drive by control makes it not give light-emitting component (organic EL) supply light emission drive current, and transistor can be set to non-luminance, and can realize non-light emission operation preferably.
In addition, according to this display unit and display drive method thereof, write in each display pixel of in display panel, arranging before the panel write operation of video data, to multirow display pixel, preferred all display pixels are carried out precharge operation and voltage correction operation simultaneously at least.Therefore, can in the very short time, between the transistorized grid and source electrode that are used for light emitting drive that in each display pixel (light emission drive circuit), is provided with, keep the component of voltage of its absolute value greater than the threshold voltage absolute value.Therefore, the panel write operation time cycle in a frame time cycle that limits in advance (approximately 16.7msec) can be set to relative long with the light emission operation time cycle, and the image that can realize good displayed image quality shows, prevents that luminosity from reducing.
According to this embodiment, following situation is described, promptly at the display drive method of the drive controlling method shown in second example as display unit, and before the panel write operation, the operation of execution voltage correction, thus in each display pixel, (be used between the transistorized grid and source electrode of light emitting drive) gathering the electric charge that equals minimum brightness voltage (its absolute value is greater than the absolute value of threshold voltage).But the present invention is not limited to this.For example, the same with the drive controlling method shown in first example, obviously can carry out the threshold value correct operation, thereby gather the electric charge that equals transistor threshold voltage that be provided with, that be used for light emitting drive in each display pixel (light emission drive circuit).
In this embodiment, the drain electrode of the maintenance transistor Tr 11 of light emission drive circuit DC is connected to supply voltage line VL.But the present invention is not limited to this.As shown in figure 21, even drain electrode is connected to retention wire HL, drain electrode also can similarly be worked.
In addition, according to this embodiment, non-luminous display voltage Vzero selects magnitude of voltage Vs.But, in light emission operation period of time T em, when the current potential of supply voltage Vsc is modulated to luminous voltage value Vs from selecting magnitude of voltage Vs, if even passing threshold changes, the transistor that is used for light emitting drive is supply of current between drain electrode and source electrode not also, and then non-luminous display voltage Vzero can be different from and selects magnitude of voltage Vs.
In the display unit according to present embodiment, any one all is a n raceway groove amorphous silicon film transistor among maintenance transistor Tr 11, selection transistor Tr 12 and the driving transistors Tr 13.But it can be a polycrystalline SiTFT, and perhaps all can be that n channel-type or all can be the p channel-types.At all is under the situation of p channel-type, only the conduction level of signal and the height of cut-off level is put upside down.

Claims (25)

1. one kind is used to supply light emission drive current and makes light-emitting component carry out luminous light emission drive circuit, comprising:
The electric charge sump portion is used for gathering electric charge according to the rate sequence signal of index intensity rate sequence;
The light emitting control part, has the driving transistors that comprises current path and control terminal, in described driving transistors, by the potential difference (PD) between described control terminal and described current path one end the current value of described light emission drive current is set, being used for flowing has light emission drive current with the corresponding current value of the quantity of electric charge that gathers at described electric charge sump portion;
Write control section, be used for according to first control signal, control is based on the electric charge supply status to described electric charge sump portion of described rate sequence signal; And
The Control of Voltage part is used for according to second control signal, and control is used to operate the driving voltage of described light emitting control part,
Wherein, pre-charge voltage is applied in described electric charge sump portion, described pre-charge voltage surpasses the threshold voltage of described driving transistors, perhaps surpass and be used to produce the minimum brightness voltage that makes described light-emitting component carry out the required described light emission drive current needs of light emission operation by the minimum brightness rate sequence
After applying described pre-charge voltage, the said write control section partly is released in the electric charge that gathers in the described electric charge sump portion according to described pre-charge voltage, and keep the electric charge of the described threshold voltage equal described driving transistors, perhaps keep the electric charge that equals described minimum brightness voltage
In the write operation time cycle after described release, described rate sequence signal is imposed on described electric charge sump portion selectively, this grade sequence signal is: have and make described light-emitting component carry out the rate sequence electric current of the current value of light emission operation by the brightness degree sequence wanted, or have and make described light-emitting component carry out the rate sequence voltage of the scheduled voltage of non-light emission operation
In light emission operation in the time cycle, the described driving transistors described light emission drive current that flows, the current value of described light emission drive current is based on the current value of the write current of the described rate sequence signal of conduct that flows through described current path in cycle said write running time; Perhaps, carry out the described rate sequence signal of non-light emission operation in the time cycle and the described light emission drive current that do not flow based on being used in said write.
2. according to the light emission drive circuit of claim 1, wherein, in the time cycle, described driving transistors applies an end and the other end of the voltage of the scope of reaching capacity to current path in described light emission operation.
3. according to the light emission drive circuit of claim 1 or 2, wherein the rate sequence signal is provided partly for described electric charge sump portion via said write control section or described light emitting control.
4. according to the light emission drive circuit of claim 1 or 2, wherein said rate sequence signal is to have to make described light-emitting component carry out the rate sequence electric current of the predetermined current value of light emission operation by the brightness degree sequence of wanting.
5. according to the light emission drive circuit of claim 1 or 2, the wherein said control section that writes has the selection transistor that comprises current path and control terminal, give described current path supply pre-charge voltage and rate sequence signal selectively, described pre-charge voltage is greater than the absolute value of the threshold voltage of driving transistors, perhaps greater than being used to produce the absolute value that makes described light-emitting component carry out the minimum brightness voltage of the required light emission drive current needs of light emission operation by the minimum brightness rate sequence; And apply described first control signal for described control terminal.
6. according to the light emission drive circuit of claim 1 or 2, wherein said Control of Voltage partly has the maintenance transistor that comprises current path and control terminal, to a distolateral supply supply voltage of described current path, and distolateral described control terminal that is connected to described driving transistors of another of described current path and described electric charge sump portion is one distolateral; Apply described second control signal for described control terminal.
7. one kind makes light-emitting component carry out luminous light emission drive circuit, comprising:
Selection wire;
Retention wire;
Data line;
Supply voltage line;
Keep transistor, have the grid that is connected to described retention wire;
Driving transistors has grid and current path, and the described grid of described driving transistors is connected to an end of the transistorized current path of described maintenance, and an end of the described current path of described driving transistors is connected to described supply voltage line;
Select transistor, have grid and current path, the transistorized described grid of described selection is connected to described selection wire, one end of the transistorized described current path of described selection is connected to the other end of the described current path of described driving transistors, and the other end of the transistorized described current path of described selection is connected to described data line; And
The electric charge sump portion is used for gathering electric charge according to the rate sequence signal of index intensity rate sequence,
Wherein, in cycle precharge time, pre-charge voltage is applied in described electric charge sump portion, described pre-charge voltage surpasses the threshold voltage of described driving transistors, perhaps surpass and be used to produce the minimum brightness voltage that makes described light-emitting component carry out the required described light emission drive current needs of light emission operation by the minimum brightness rate sequence
Apply correct operation behind the described pre-charge voltage in the time cycle, partly be released in the electric charge that gathers in the described electric charge sump portion according to described pre-charge voltage, and reservation equals the electric charge of the described threshold voltage of described driving transistors, perhaps keep the electric charge that equals described minimum brightness voltage
After the described release, described rate sequence signal is imposed on described electric charge sump portion selectively, this grade sequence signal is: have and make described light-emitting component carry out the rate sequence electric current of the current value of light emission operation by the brightness degree sequence wanted, or have and make described light-emitting component carry out the rate sequence voltage of the scheduled voltage of non-light emission operation.
8. according to the light emission drive circuit of claim 7, wherein mutually different control signal is outputed to described selection wire and described retention wire.
9. according to the light emission drive circuit of claim 7 or 8, wherein in described cycle precharge time, pass through the described selection transistor of the first control signal conducting from described selection wire, by the described maintenance transistor of the second control signal conducting from described retention wire, and give described driving transistors supply voltage, this voltage perhaps surpasses and is used to produce the minimum brightness voltage that makes described light-emitting component carry out the required light emission drive current needs of light emission operation by the minimum brightness rate sequence greater than the absolute value of the threshold voltage of described driving transistors; And
End described selection transistor by described first control signal at described correct operation in time cycle from described selection wire, and be arranged on the voltage between the other end of described current path of the described grid of described driving transistors and described driving transistors, make its threshold voltage that is reduced to described driving transistors or described minimum brightness voltage.
10. so that light-emitting component is carried out luminously, described drive controlling method may further comprise the steps to light-emitting component supply light emission drive current for the drive controlling method of a light emission drive circuit, described drive controlling method:
The step of first potential difference (PD) is set, between the grid and source electrode of transistor unit, setting equals first potential difference (PD) of described transistor unit threshold voltage, or first potential difference (PD) that equals to produce the needed minimum brightness voltage of described light emission drive current when making described light-emitting component carry out light emission operation with the minimum brightness rate sequence is set, this transistor unit is used for supplying described light emission drive current to described light-emitting component;
The step of second potential difference (PD) is set, apply the rate sequence signal for described transistor unit, described rate sequence signal makes described light-emitting component carry out light emission operation or non-light emission operation by the brightness degree sequence, and is provided with and corresponding second potential difference (PD) of described brightness degree sequence between the grid of described transistor unit and source electrode; And
Supply the step of described light emission drive current to described light-emitting component, according to the conducted state conducting described transistor unit of described second potential difference (PD) to be scheduled to, generation has the described light emission drive current with the corresponding current value of described brightness degree sequence, and it is supplied to described light-emitting component
Wherein, in the described step that second potential difference (PD) is set, make described light-emitting component carry out the current value of light emission operation by the brightness degree sequence wanted by applying to have, rate sequence electric current as described rate sequence signal, between the grid of described transistor unit and source electrode, gather to add and give first potential difference (PD) and based on the electric charge of described rate sequence electric current, described second potential difference (PD) is set, perhaps, make described light-emitting component carry out the scheduled voltage of non-light emission operation by applying to have, rate sequence voltage as described rate sequence signal, release is based on the electric charge of described first potential difference (PD) that keeps between the grid of described transistor unit and source electrode, described second potential difference (PD) is set
The described step that first potential difference (PD) is set comprises:
Between the grid and source electrode of described transistor unit, setting is based on three potential difference (PD) of its absolute value greater than the pre-charge voltage of described threshold voltage, perhaps, be provided with based on the step of its absolute value greater than the 3rd potential difference (PD) of the pre-charge voltage of described minimum brightness voltage; And
Based on described the 3rd potential difference (PD) and the described transistor unit of conducting, and reservation equals the electric charge of the described threshold voltage of described driving transistors, perhaps keep and equal to be used to produce the electric charge that makes described light-emitting component carry out the minimum brightness voltage of the required described light emission drive current needs of light emission operation by the minimum brightness rate sequence, thus, the grid of described transistor unit and the potential difference (PD) between the source electrode are set to the step of described first potential difference (PD).
11. a display unit comprises:
A plurality of display pixels, each display pixel comprises light-emitting component and light emission drive circuit respectively, described light emission drive circuit has: the electric charge sump portion is used for according to indicating that the rate sequence signal with the corresponding brightness degree sequence of video data gathers electric charge; The light emitting control part is used for producing the light emission drive current that has with the corresponding predetermined current value of gathering at described electric charge sump portion of the quantity of electric charge, and supplies described light emission drive current to described light-emitting component; Write control section, be used to control electric charge supply status to described electric charge sump portion based on described rate sequence signal; And the Control of Voltage part, be used to control the driving voltage that makes described light emitting control part executable operations;
Selection wire wherein applies the write control signal of the mode of operation of the said write control section that is used to control described each display pixel;
Retention wire wherein applies the voltage control signal of the mode of operation of the described Control of Voltage part that is used to control described each display pixel; And
Data line is wherein supplied described rate sequence signal,
Wherein, described light emitting control partly has the driving transistors that comprises current path and control terminal, in described driving transistors, by the potential difference (PD) between described control terminal and described current path one end the current value of described light emission drive current is set,
Pre-charge voltage is applied in described electric charge sump portion, described pre-charge voltage surpasses the threshold voltage of described driving transistors, perhaps surpass the needed minimum brightness voltage of described light emission drive current that is used to produce when making described light-emitting component carry out light emission operation by the minimum brightness rate sequence
After applying described pre-charge voltage, described light emission drive circuit partly is released in the electric charge that gathers in the described electric charge sump portion according to described pre-charge voltage, and reservation equals the electric charge of the described threshold voltage of described driving transistors, perhaps keep and equal to be used to produce the electric charge that makes described light-emitting component carry out the minimum brightness voltage of the required described light emission drive current needs of light emission operation by the minimum brightness rate sequence
After the described release, described rate sequence signal is imposed on described electric charge sump portion selectively, this grade sequence signal is: have and make described light-emitting component carry out the rate sequence electric current of the current value of light emission operation by the brightness degree sequence wanted, or have and make described light-emitting component carry out the rate sequence voltage of the scheduled voltage of non-light emission operation.
12. the display unit according to claim 11 also comprises:
In described selection wire, apply the selection driver of said write control signal;
In described retention wire, apply the maintenance driver of described voltage control signal; And
Supply the data driver of described rate sequence signal for described data line.
13. according to the display unit of claim 11 or 12,
Wherein said electric charge sump portion comprises capacity cell,
Described light emitting control partly comprises driving transistors, in described driving transistors, one of the current path that described light emission drive current flows through distolaterally is connected to described light-emitting component, but also be connected to the distolateral of described capacity cell, the distolateral supply voltage that is used for mobile described light emission drive current that applies of another of described current path, it is distolateral that the control terminal that is used to control the supply status of described light emission drive current is connected to another of described capacity cell
The said write control section comprises the selection transistor, in described selection transistor, one of current path distolaterally is connected to described data line, and another of described current path be distolateral to be connected to the distolateral of described capacity cell, control terminal is connected to described selection wire, and
Described voltage control division branch comprises the maintenance transistor, and in described maintenance transistor, distolateral another of described capacity cell of being connected to of current path is distolateral, and control terminal is connected to described retention wire.
14. display unit according to claim 13, wherein said light emitting control partly produces the described light emission drive current with described predetermined current value, wherein, corresponding to the potential difference (PD) based on the quantity of electric charge that gathers in described capacity cell, described driving transistors is in predetermined conducted state conducting.
15. according to the display unit of claim 13, also comprise the supply voltage driver, be used for applying described supply voltage to another of the described current path of described driving transistors is distolateral.
16. according to the display unit of claim 15, it is distolateral that the described control terminal of wherein said driving transistors is connected to another of described capacity cell, described supply voltage driver applies described supply voltage for the described control terminal of described driving transistors.
17. according to the display unit of claim 12, the pre-charge voltage that wherein said data driver applies the threshold voltage that surpasses described driving transistors for described data line, and
Described light emission drive circuit applies the described pre-charge voltage that is applied in described data line for described electric charge sump portion via the said write control section.
18. display unit according to claim 12, wherein said data driver applies pre-charge voltage for described data line, the described minimum brightness voltage that described light emission drive current when described pre-charge voltage makes described light-emitting component carry out light emission operation by the minimum brightness rate sequence above generation needs
Described light emission drive circuit applies the described pre-charge voltage that is applied in described data line for described electric charge sump portion via the said write control section.
19. according to the display unit of claim 12, wherein said light emission drive circuit applies the described rate sequence signal that imposes on described data line from described data driver for described electric charge sump portion via the said write control section.
20. according to the display unit of claim 19, wherein said rate sequence signal is to have based on described video data to make described light-emitting component carry out the rate sequence electric current of the predetermined current value of light emission operation by the brightness degree sequence of wanting; And accumulate in the described electric charge sump portion with described rate sequence electric current corresponding charge.
21. according to the display unit of claim 19, wherein said rate sequence signal is to have based on described video data to make described light-emitting component carry out the rate sequence voltage of the scheduled voltage of non-light emission operation; And the electric charge that gathers in described electric charge sump portion discharges according to described rate sequence voltage.
22. according to the display unit of claim 21, wherein said data driver applies described rate sequence electric current and described rate sequence voltage for selectively described data line.
23. a display has:
Selection wire;
Retention wire;
Data line;
Supply voltage line;
Keep transistor, the transistorized grid of described maintenance is connected to described retention wire;
Driving transistors has grid and current path, and the grid of described driving transistors is connected to an end of the transistorized current path of described maintenance, and an end of the current path of described driving transistors is connected to described supply voltage line;
Select transistor, have grid and current path, the transistorized grid of described selection is connected to described selection wire, one end of the transistorized current path of described selection is connected to the other end of the described current path of described driving transistors, and the other end of the transistorized current path of described selection is connected to described data line;
The electric charge sump portion is used for gathering electric charge according to the rate sequence signal of index intensity rate sequence;
Light-emitting component is connected to the other end of the described current path of described driving transistors;
Select driver, output selects signal to described selection wire;
Keep driver, the output holding signal is to described retention wire;
Data driver, the Class Of Supply sequence signal is to described data line; And
The supply voltage driver, the output supply voltage arrives described supply voltage line,
Wherein, pre-charge voltage is applied in described electric charge sump portion, described pre-charge voltage surpasses the threshold voltage of described driving transistors, perhaps surpass and be used to produce the minimum brightness voltage that makes described light-emitting component carry out the required light emission drive current needs of light emission operation by the minimum brightness rate sequence
After applying described pre-charge voltage, partly be released in the electric charge that gathers in the described electric charge sump portion according to described pre-charge voltage, and reservation equals the electric charge of the described threshold voltage of described driving transistors, perhaps keep and equal to be used to produce the electric charge that makes described light-emitting component carry out the minimum brightness voltage of the required described light emission drive current needs of light emission operation by the minimum brightness rate sequence
After the described release, described rate sequence signal is imposed on described electric charge sump portion selectively, this grade sequence signal is: have and make described light-emitting component carry out the rate sequence electric current of the current value of light emission operation by the brightness degree sequence wanted, or have and make described light-emitting component carry out the rate sequence voltage of the scheduled voltage of non-light emission operation.
24. the display drive method of a display unit, described display unit comprises the display panel with a plurality of display pixels, and by supply indicate with the rate sequence signal of the corresponding brightness degree sequence of video data to each described display pixel, make each described display pixel carry out light emission operation or non-light emission operation by the predetermined brightness rate sequence, and on described display panel, show the image information of wanting, said method comprising the steps of:
The step of first potential difference (PD) is set, at least a portion of described a plurality of display pixels is set to selection mode, between the grid of transistor unit and source electrode, first potential difference (PD) is set, the current-control type light-emitting component that this transistor unit is used for being provided with to each described display pixel is supplied light emission drive current, described first potential difference (PD) equals the threshold voltage of transistor unit, and perhaps described first potential difference (PD) equals to produce the needed minimum brightness voltage of described light emission drive current when making described light-emitting component carry out light emission operation by the minimum brightness rate sequence;
The step of second potential difference (PD) is set, sequentially the described display pixel of every row of described display panel is set to selection mode, sequentially apply the rate sequence signal, the described light-emitting component that this grade sequence signal makes each described display pixel is by carrying out light emission operation or non-light emission operation with the corresponding predetermined luminance rate sequence of described video data, and is provided with and corresponding second potential difference (PD) of described brightness degree sequence between the grid of described transistor unit and source electrode; And
The step of supplying described light emission drive current to each described light-emitting component, at least a portion of a plurality of described display pixels of arranging on the described display panel is set to nonselection mode, according to the described transistor unit of described second potential difference (PD) with predetermined each described display pixel of conducted state conducting, and produce its current value and the corresponding described light emission drive current of described brightness degree sequence separately, and described glow current is supplied to each described light-emitting component
Wherein, in the described step that second potential difference (PD) is set, make described light-emitting component carry out the current value of light emission operation by the brightness degree sequence wanted by applying to have, rate sequence electric current as described rate sequence signal, between the grid of described transistor unit and source electrode, gather to add and give described first potential difference (PD) and based on the electric charge of described rate sequence electric current, described second potential difference (PD) is set, perhaps, make described light-emitting component carry out the scheduled voltage of non-light emission operation by applying to have, rate sequence voltage as described rate sequence signal, release is provided with described second potential difference (PD) based on the electric charge of described first potential difference (PD) that keeps between the grid of described transistor unit and source electrode.
25. according to the display drive method of claim 24, the step that described first potential difference (PD) wherein is set in each described display pixel comprises:
At least a portion of a plurality of described display pixels is set to selection mode, and the step of the 3rd potential difference (PD) is set between the grid of the described transistor unit of each described display pixel and source electrode according to pre-charge voltage, described pre-charge voltage is greater than the absolute value of described threshold voltage, and perhaps described pre-charge voltage is greater than the absolute value of described minimum brightness voltage; And
At least a portion of a plurality of described display elements is set to nonselection mode, according to the described transistor unit of described the 3rd potential difference (PD) conducting that is provided with in each described display pixel, and the grid of described transistor unit and the potential difference (PD) between the source electrode are set to the step of described first potential difference (PD).
CN2005800047929A 2004-12-13 2005-12-13 Light emission drive circuit and its drive control method and display unit and its display drive method Expired - Fee Related CN1918617B (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP2004360105A JP4400438B2 (en) 2004-12-13 2004-12-13 LIGHT EMITTING DRIVE CIRCUIT, ITS DRIVE CONTROL METHOD, DISPLAY DEVICE, AND ITS DISPLAY DRIVE METHOD
JP360105/2004 2004-12-13
JP2004368031A JP2006177988A (en) 2004-12-20 2004-12-20 Emission driving circuit and driving control method for the same, and display apparatus and display driving method for the same
JP368031/2004 2004-12-20
JP368850/2004 2004-12-21
JP2004368850A JP4400443B2 (en) 2004-12-21 2004-12-21 LIGHT EMITTING DRIVE CIRCUIT, ITS DRIVE CONTROL METHOD, DISPLAY DEVICE, AND ITS DISPLAY DRIVE METHOD
PCT/JP2005/023214 WO2006064943A1 (en) 2004-12-13 2005-12-13 Light emission drive circuit and its drive control method and display unit and its display drive method

Publications (2)

Publication Number Publication Date
CN1918617A CN1918617A (en) 2007-02-21
CN1918617B true CN1918617B (en) 2010-05-05

Family

ID=36671975

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2005800047929A Expired - Fee Related CN1918617B (en) 2004-12-13 2005-12-13 Light emission drive circuit and its drive control method and display unit and its display drive method

Country Status (2)

Country Link
JP (1) JP4400438B2 (en)
CN (1) CN1918617B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7663615B2 (en) 2004-12-13 2010-02-16 Casio Computer Co., Ltd. Light emission drive circuit and its drive control method and display unit and its display drive method
JP2006177988A (en) * 2004-12-20 2006-07-06 Casio Comput Co Ltd Emission driving circuit and driving control method for the same, and display apparatus and display driving method for the same
JP4852866B2 (en) * 2005-03-31 2012-01-11 カシオ計算機株式会社 Display device and drive control method thereof
JP4798342B2 (en) * 2005-03-31 2011-10-19 カシオ計算機株式会社 Display drive device and drive control method thereof, and display device and drive control method thereof
TWI424408B (en) * 2005-08-12 2014-01-21 Semiconductor Energy Lab Semiconductor device, display device and electronic device equipped with the semiconductor device
JP5182382B2 (en) * 2011-01-11 2013-04-17 カシオ計算機株式会社 Display device
JP5182383B2 (en) * 2011-01-11 2013-04-17 カシオ計算機株式会社 Display device
CN102789761B (en) * 2012-08-06 2014-12-10 京东方科技集团股份有限公司 Pixel circuit, driving method thereof and organic light emitting display
WO2015122365A1 (en) * 2014-02-17 2015-08-20 凸版印刷株式会社 Thin-film transistor array device, el device, sensor device, drive method for thin-film transistor array device, drive method for el device, and drive method for sensor device
CN104157240A (en) * 2014-07-22 2014-11-19 京东方科技集团股份有限公司 Pixel drive circuit, driving method, array substrate and display device
CN105913805A (en) * 2016-06-06 2016-08-31 陕西科技大学 Pixel driving circuit structure of AMOLED display
CN109520972A (en) * 2018-12-04 2019-03-26 青岛理工大学 A kind of stagewise visibility measurement method and device
CN109743509B (en) * 2019-01-15 2021-01-05 上海曼恒数字技术股份有限公司 Method and device for supplementing light for camera
CN113870774B (en) * 2020-06-30 2022-12-02 北京小米移动软件有限公司 Display control method, display control apparatus, and computer-readable storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030095087A1 (en) * 2001-11-20 2003-05-22 International Business Machines Corporation Data voltage current drive amoled pixel circuit
CN1525425A (en) * 2003-02-25 2004-09-01 卡西欧计算机株式会社 Display apparatus and driving method for display apparatus
CN1552052A (en) * 2001-09-07 2004-12-01 ���µ�����ҵ��ʽ���� El display, EL display driving circuit and image display
US20040246212A1 (en) * 2003-06-05 2004-12-09 Yoshinao Kobayashi Image display apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4230744B2 (en) * 2001-09-29 2009-02-25 東芝松下ディスプレイテクノロジー株式会社 Display device
JP2003202834A (en) * 2001-10-24 2003-07-18 Semiconductor Energy Lab Co Ltd Semiconductor device and driving method therefor
JP2003216100A (en) * 2002-01-21 2003-07-30 Matsushita Electric Ind Co Ltd El (electroluminescent) display panel and el display device and its driving method and method for inspecting the same device and driver circuit for the same device
GB0307320D0 (en) * 2003-03-29 2003-05-07 Koninkl Philips Electronics Nv Active matrix display device
JP4232193B2 (en) * 2003-05-26 2009-03-04 カシオ計算機株式会社 CURRENT GENERATION SUPPLY CIRCUIT AND DISPLAY DEVICE PROVIDED WITH CURRENT GENERATION SUPPLY CIRCUIT

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1552052A (en) * 2001-09-07 2004-12-01 ���µ�����ҵ��ʽ���� El display, EL display driving circuit and image display
US20030095087A1 (en) * 2001-11-20 2003-05-22 International Business Machines Corporation Data voltage current drive amoled pixel circuit
CN1525425A (en) * 2003-02-25 2004-09-01 卡西欧计算机株式会社 Display apparatus and driving method for display apparatus
US20040246212A1 (en) * 2003-06-05 2004-12-09 Yoshinao Kobayashi Image display apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
同上.

Also Published As

Publication number Publication date
JP2006171109A (en) 2006-06-29
CN1918617A (en) 2007-02-21
JP4400438B2 (en) 2010-01-20

Similar Documents

Publication Publication Date Title
CN1918617B (en) Light emission drive circuit and its drive control method and display unit and its display drive method
CN1989539B (en) Display drive apparatus, display apparatus and drive control method thereof
CN101283391B (en) Display apparatus and drive control method thereof
CN1331108C (en) Display apparatus and driving method thereof
CN100541567C (en) Display device and drive controlling method thereof
CN101405786B (en) Display device and drive method, display drive and its drive method
KR100854857B1 (en) Light emission drive circuit and its drive control method and display unit and its display drive method
CN100545895C (en) Display device and be used to drive the method for display device
EP2889861B1 (en) Organic light emitting display device wherein driving characteristic values are sensed by a reference line in common to neighbouring pixels
CN103778889B (en) Organic light emitting diode circuit and driving method thereof
CN101273398B (en) Display device and driving method for display device
CN101978415B (en) Display panel with matrix form pixels
TWI330817B (en) Display drive apparatus, display apparatus and drive control method thereof
CN100416639C (en) Pixel circuit, display apparatus, and method for driving pixel circuit
CN101421771B (en) Display drive device and display device
KR100962768B1 (en) Display apparatus and drive control method thereof
CN100424741C (en) Display device and demultiplexer
CN101887688B (en) Display apparatus, light detection method and electronic apparatus
CN101123068B (en) Display drive apparatus and display apparatus
CN101556762B (en) Image display device and driving method of image display device
CN105096819A (en) Display apparatus and pixel circuit thereof
CN104751781A (en) Organic Light Emitting Display Device And Method For Driving The Same
KR20090056939A (en) Display drive apparatus, display apparatus and drive method therefor
JP2006516745A (en) Active matrix display device
CN101542572A (en) Active matrix display device with optical feedback and driving method thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20170123

Address after: Irish Ross Kang Wangjun

Patentee after: Soras OLED

Address before: Tokyo, Japan

Patentee before: CASIO COMPUTER Co.,Ltd.

TR01 Transfer of patent right

Effective date of registration: 20200330

Address after: Irish Ross Kang Wangjun

Patentee after: Soras OLED

Address before: Tokyo, Japan

Patentee before: CASIO COMPUTER Co.,Ltd.

TR01 Transfer of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20100505

Termination date: 20211213

CF01 Termination of patent right due to non-payment of annual fee