CN108806601A - Dot structure and its driving method, display device - Google Patents

Dot structure and its driving method, display device Download PDF

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Publication number
CN108806601A
CN108806601A CN201810672936.7A CN201810672936A CN108806601A CN 108806601 A CN108806601 A CN 108806601A CN 201810672936 A CN201810672936 A CN 201810672936A CN 108806601 A CN108806601 A CN 108806601A
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CN
China
Prior art keywords
transistor
switch
driving transistor
signal
control terminal
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Application number
CN201810672936.7A
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Chinese (zh)
Inventor
朱雪婧
黄秀颀
朱晖
张九占
孙光远
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昆山国显光电有限公司
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Priority to CN201810672936.7A priority Critical patent/CN108806601A/en
Publication of CN108806601A publication Critical patent/CN108806601A/en

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3241Matrix-type displays
    • H01L27/3244Active matrix displays
    • H01L27/3248Connection of the pixel electrode to the TFT
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3241Matrix-type displays
    • H01L27/3244Active matrix displays
    • H01L27/326Active matrix displays special geometry or disposition of pixel-elements
    • H01L27/3262Active matrix displays special geometry or disposition of pixel-elements of TFT
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/28Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part
    • H01L27/32Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes [OLED]
    • H01L27/3241Matrix-type displays
    • H01L27/3244Active matrix displays
    • H01L27/326Active matrix displays special geometry or disposition of pixel-elements
    • H01L27/3265Active matrix displays special geometry or disposition of pixel-elements of capacitor
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0233Improving the luminance or brightness uniformity across the screen

Abstract

A kind of dot structure of present invention offer and its driving method, display device, the dot structure includes light emitting diode, driving transistor, storage capacitance, data receipt unit, first switch unit, second switch unit, the first compensating unit and the second compensating unit or the dot structure includes light emitting diode, driving transistor, storage capacitance, the first to the 5th switching transistor.The solution of the present invention can eliminate the hysteresis effect of driving transistor, improve response speed, it can avoid brightness disproportionation caused by the threshold voltage shift by driving transistor, and the compensation that can also realize power cord IR pressure drops, to greatly improve the display brightness uniformity and stability of display device.

Description

Dot structure and its driving method, display device

Technical field

The present invention relates to display technology field more particularly to a kind of dot structure and its driving method, display devices.

Background technology

Organic Light Emitting Diode (OLED) is used as a kind of current mode luminescent device, is applied to high-performance more and more In display.For active matrix organic light-emitting display (Active Matrix OLED, AMOLED), in pixel region Organic Light Emitting Diode (OLED) and thin film transistor (TFT) (TFT) are generally included, and when OLED is by TFT and its operation is produced Electric current drive.Current AMOLED display panels generally use low temperature polycrystalline silicon (LTPS) substrate, are made on LTPS substrates When making tft array, often because the problems such as uniformity, causing on LTPS substrates TFT everywhere made of process variation or technique Threshold voltage (Vth) it is uneven so that generated driving current also difference when each TFT operation in turn results in each The brightness that OELD is sent out is inconsistent, affects the display effect of displayer;In addition, working as AMOLED size of display panels When becoming larger, providing the IR problem of pressure drop on power supply (VDD) cabling of power supply for tft array can also become to be particularly acute, and can cause The VDD that receives on each TFT is different, generated driving current difference bigger when each TFT then being caused to operate, thus can be into One step causes the display quality of displayer to decline.

Invention content

The purpose of the present invention is to provide a kind of dot structure and its driving method, display devices, can compensate for threshold value electricity Pressure eliminates IR problem of pressure drop, improves show uniformity and stability.

To achieve the goals above, the present invention provides a kind of dot structure, including:Light emitting diode, is deposited at driving transistor Storing up electricity appearance, data receipt unit, first switch unit, second switch unit, the first compensating unit and the second compensating unit, In,

The driving transistor a, including control terminal, a first end and a second end, the second end of the driving transistor Connect one end of the light emitting diode, one reference signal of another termination of the light emitting diode or ground connection, the driving Transistor is used to drive the lumination of light emitting diode according to the potential difference between the control terminal and the first end;

The data receipt unit connects the control terminal of the driving transistor, for providing one according to scan signal Pixel data signal to the driving transistor control terminal;

The first switch unit is connected between a power cord and the first end of the driving transistor, for receiving The voltage of power supply is stated, and the voltage of the power supply is provided to the driving transistor under the control of a LED control signal First end;

The second switch unit is connected between the control terminal of the driving transistor and the data receipt unit, is used The pixel data signal that the data receipt unit receives is sent to the drive under the control in the LED control signal The control terminal of dynamic transistor;

The storage capacitance is connected between the first end of the driving transistor and the data receipt unit;

First compensating unit connects between the second end and control terminal of the driving transistor, and second compensation is single One end of member connects an initializing signal line, and the other end is connected to the control of first compensating unit and the driving transistor It holds on the one end being connected, first compensating unit is used for the control of the driving transistor under the control of scan signal End processed and second end are turned on or off, and the electric current that when driving transistor is connected flows out is through second compensating unit It is transmitted to the initializing signal line;Second compensating unit is used for the initialization under the control of the scanning signal The initializing signal that signal wire provides is transmitted to the control terminal of first compensating unit and the driving transistor.

Optionally, the first switch unit includes first switch transistor, and the first switch transistor includes a control End, a first end and a second end processed, the control terminal of the first switch transistor receive the LED control signal, and described the The first end of one switching transistor receives the supply voltage, and the second end of the first switch transistor connects the driving crystalline substance The first end of body pipe.

Optionally, the second switch unit includes second switch transistor, and the second switch transistor includes a control End, a first end and a second end processed, the control terminal of the second switch transistor receive the LED control signal, and described the The first end of two switching transistors connects one end of one end and the storage capacitance of the data receipt unit, and described second opens The second end for closing transistor connects the control terminal of the driving transistor.

Optionally, the data receipt unit includes third switching transistor, and the third switching transistor includes a control The control terminal of end, a first end and a second end processed, the third switching transistor receives the scanning signal, and the third is opened The first end for closing transistor accesses the pixel data signal, and the second end connection described second of the third switching transistor is opened Close one end of unit.

Optionally, first compensating unit includes the 4th switching transistor, and the 4th switching transistor includes a control The control terminal of end, a first end and a second end processed, the 4th switching transistor receives the scanning signal, and the described 4th opens The first end for closing transistor connects the control terminal of the driving transistor, described in the second end connection of the 4th switching transistor The second end of driving transistor.

Optionally, second compensating unit includes the 5th switching transistor, and the 5th switching transistor includes a control The control terminal of end, a first end and a second end processed, the 5th switching transistor receives the scanning signal, and the described 5th opens The first end for closing transistor accesses the initializing signal, second end connection first compensation of the 5th switching transistor One end that unit is connected with the control terminal of the driving transistor.

The present invention also provides a kind of driving methods of above-mentioned dot structure, include the following steps:

Initial phase:The scanning signal at least controls first compensating unit and the conducting of the second compensating unit, institute It states LED control signal and at least controls the first switch unit conducting, the light emitting diode connects the driving transistor The current potential of one end is initialized to the corresponding voltage of the initializing signal, has electric current to be opened successively through described first from the power supply It closes unit, driving transistor, first compensating unit and second compensating unit and flows to the initializing signal line, to disappear Except the hysteresis effect of the driving transistor, the current potential that the storage capacitance connects one end of the driving transistor is the electricity The voltage in source;

Compensated stage:The scanning signal controls the data receipt unit, the first compensating unit and the second compensating unit Conducting, the LED control signal control the second switch unit and first switch unit cut-off, the storage capacitance The current potential for connecting one end of the data receipt unit is the voltage of the pixel data signal, the control of the driving transistor End and second end are connected by first compensating unit, and second compensating unit is by the electricity of the control terminal of the driving transistor Position becomes the voltage of the initializing signal, and the storage capacitance connects the current potential of one end of the driving transistor by the electricity The voltage in source gradually decreases down Vinit+ | Vth(T0)|,Vth(T0)For the threshold voltage of driving transistor, Vinit is described initial Change the voltage of signal;

Glow phase:The scanning signal controls the data receipt unit, the first compensating unit and the second compensating unit Cut-off, the LED control signal control the second switch unit and first switch unit conducting, the storage capacitance The jump in potential of one end of the driving transistor is connected to the voltage of the power supply, the storage capacitance connects the data and connects The current potential for receiving one end of unit is provided to the control terminal of the driving transistor, and the driving transistor conducting drives the hair Optical diode shines.

The present invention also provides a kind of dot structure, including light emitting diode, driving transistor, storage capacitance and first to 5th switching transistor, the driving transistor and first to the 5th switching transistor include control terminal, first end And second end, wherein the second end of the driving transistor connects one end of the light emitting diode, the light emitting diode One reference signal of another termination or ground connection, the first end of the driving transistor connect the second of the first switch transistor End and one end of the storage capacitance, the control terminal of the driving transistor are separately connected the of the second switch transistor Two ends, the first end of the 4th switching transistor and the 5th switching transistor second end;The first switch is brilliant The first end of body pipe connects a power supply, and the control terminal of the first switch transistor accesses a LED control signal;Described second The control terminal of switching transistor accesses the LED control signal, and the first end of the second switch transistor connects the third The second end of switching transistor;The first end of the third switching transistor accesses a pixel data signal, the third switch The control terminal of transistor accesses scan signal;The control terminal access scanning signal of 4th transistor, the described 4th The second end of switching transistor connects the second end of the driving transistor;The control terminal of 5th switching transistor accesses institute Scanning signal is stated, the first end of the 5th switching transistor connects an initializing signal line.

The present invention also provides a kind of driving methods of above-mentioned dot structure, include the following steps:

Initial phase:The scanning signal at least controls the 4th switching transistor and the 5th switching transistor is led Logical, the LED control signal at least controls the first switch transistor turns, and the light emitting diode connects the driving The current potential of one end of transistor is initialized to the corresponding voltage of the initializing signal, has electric current from the power supply successively through institute State first switch transistor, driving transistor, the 4th switching transistor and the 5th switching transistor flow to it is described just Beginningization signal wire, to eliminate the hysteresis effect of the driving transistor, the storage capacitance connects the one of the driving transistor The current potential at end is the voltage of the power supply;

Compensated stage:The scanning signal controls the third switching transistor, the 4th switching transistor and the 5th switch Transistor turns, the LED control signal control the second switch transistor and the first switch transistor cutoff, institute The current potential for stating one end that storage capacitance connects the third transistor is the voltage of the pixel data signal, the driving crystal The control terminal and second end of pipe are connected by the 4th switching transistor, and the 5th switching transistor is by the driving transistor The current potential of control terminal become the voltage of the initializing signal, the storage capacitance connects one end of the driving transistor Current potential gradually decreases down Vinit+ by the voltage of the power supply | Vth(T0)|,Vth(T0)For the threshold voltage of driving transistor, Vinit is the voltage of the initializing signal;

Glow phase:The scanning signal controls the third switching transistor, the 4th switching transistor and the 5th switch Transistor cutoff, the LED control signal control the second switch transistor and the first switch transistor turns, institute State storage capacitance connect the driving transistor one end jump in potential to the voltage of the power supply, storage capacitance connection The current potential of one end of the third switching transistor is provided to the control terminal of the driving transistor, and the driving transistor is led It is logical, drive the lumination of light emitting diode.

The present invention also provides a kind of display devices, including above-mentioned dot structure, or including picture according to any one of claims 8 Plain structure.

Compared with prior art, technical scheme of the present invention has the following effects that:

1, the hysteresis effect of driving transistor can be eliminated, response speed is improved;

2, driving current when driving transistor driving lumination of light emitting diode is by the voltage of pixel data signal and initial Change the voltage decision of signal, and it is unrelated with the voltage of the threshold voltage of each transistor and power supply, therefore can avoid by each Brightness disproportionation caused by the threshold voltage shift of a transistor, and can also realize the compensation of the IR pressure drops on power cord, from And greatly improve the display brightness uniformity and stability of display device.

Description of the drawings

Fig. 1 is the circuit diagram of the dot structure of the specific embodiment of the invention;

Fig. 2 is the time sequential routine figure of the scanning signal and LED control signal in dot structure shown in FIG. 1.

Specific implementation mode

To make the purpose of the present invention, feature be clearer and more comprehensible, the specific implementation mode of the present invention is made below in conjunction with the accompanying drawings Further instruction, however, the present invention can be realized with different forms, should not be to be confined to the embodiment described.In addition, Attached drawing only for the purpose of description, and is mapped not according to full size.To make to be easy to understand, similar elements will be with identical in following the description Symbology illustrate.About " first " used herein, " second " ... etc., not especially censure order or cis-position The meaning, also non-limiting the present invention, the element described with same technique term just for the sake of difference or operation.

Fig. 1 is a kind of schematic diagram of dot structure of one embodiment of the invention.Referring to FIG. 1, one embodiment of the invention carries For a kind of dot structure, including:Light emitting diode OLED, driving transistor T0, storage capacitance C, first switch unit 101, Two switch units 102, the first compensating unit 103, the second compensating unit 104 and data receipt unit 105.

In the present embodiment, the driving transistor T0 includes a control terminal, a first end and a second end, the driving The second end of transistor T0 connects one end (i.e. anode) of the light emitting diode OLED, and the light emitting diode OLED's is another End (i.e. cathode) connects a reference signal VSS or ground connection, and the voltage of the VSS is higher than the drive of light emitting diode OLED highest grayscale Dynamic voltage, the driving transistor T0 are used to shine according to the potential difference driving between the control terminal and the first end is described Diode OLED shines.

In the present embodiment, the first switch unit 101 includes first switch transistor T1, the first switch crystal Pipe T1 includes a control terminal, a first end and a second end, and the control terminal of the first switch transistor T1 receives a luminous control The first end of signal Em processed, the first switch transistor T1 receive the voltage VDD, the first switch transistor T1 of a power supply Second end connect the first end of the driving transistor T0, the first switch transistor T1 is used to receive the electricity of the power supply VDD is pressed, and the voltage VDD of the power supply is provided to the driving transistor T0 under the control of the LED control signal Em First end.

In the present embodiment, the second switch unit 102 includes second switch transistor T2, the second switch crystal Pipe T2 includes a control terminal, a first end and a second end, and the control terminal of the second switch transistor T2 receives described shine The first end of control signal Em, the second switch transistor T2 connects one end of the data receipt unit 105 and described deposits Storing up electricity holds one end of C, and the second end of the second switch transistor T2 connects the control terminal of the driving transistor T0, and described the The pixel that two switching transistor T2 are used to receive the data receipt unit 105 under the control of the LED control signal Em Data-signal Vdata is sent to the control terminal of the driving transistor T0.

In the present embodiment, the data receipt unit 105 includes third switching transistor T3, and the third switchs crystal Pipe T3 includes a control terminal, a first end and a second end, and the control terminal of the third switching transistor T3 receives a scanning letter The first end of number Sn, the third switching transistor T3 access the pixel data signal Vdata, the third switching transistor The second end of T3 connects one end of the second switch unit 102 and one end of storage capacitance C, the third switching transistor T3 is used to provide pixel data signal Vdata to the control terminal of the driving transistor T0 according to scanning signal Sn.

In the present embodiment, first compensating unit 103 includes the 4th switching transistor T4, the 4th switch crystal Pipe T4 includes a control terminal, a first end and a second end, and the control terminal of the 4th switching transistor T4 receives the scanning The first end of signal Sn, the 4th switching transistor T4 connect the control terminal of the driving transistor T0, the 4th switch The second end of transistor T4 connects the second end of the driving transistor T0;Second compensating unit includes the 5th switch crystal Pipe T5, the 5th switching transistor T5 include a control terminal, a first end and a second end, the 5th switching transistor T5 Control terminal receive the scanning signal Sn, the first end of the 5th switching transistor T5 connects an initializing signal line, institute It states initializing signal line and one initializing signal is provided, second end connection first compensation of the 5th switching transistor T5 is single One end (i.e. the first end of the 4th switching transistor T4) that member 103 is connect with the control terminal of the driving transistor T0;Described Four switching transistor T4 are used to that the control terminal of the driving transistor T0 and second end to be connected under the control of scanning signal Sn Or disconnect, and described in the electric current that flows out of when driving transistor T0 be connected is transmitted to through single 105 yuan of second compensation Initializing signal line;The 5th switching transistor T5 is used for the initializing signal under the control of the scanning signal Sn The initializing signal that line provides is transmitted to the control terminal of first compensating unit 103 and the driving transistor T0.

The second of the first end of driving transistor T0 and first switch transistor T0 described in one end of the storage capacitance C End, the other end of the storage capacitance C connect one end of the data receipt unit 105 (i.e. the of third switching transistor T3 Two ends) and second switch unit 102 one end (i.e. the first end of second switch transistor T2).

Above-mentioned first switch transistor T1, second switch transistor T2, third switching transistor T3, the 4th switch crystal Pipe T4, the 5th switching transistor T5 and driving transistor T0 can be respectively selected from polycrystalline SiTFT, amorphous silicon membrane Any one in transistor, oxide thin film transistor, Organic Thin Film Transistors.In addition, first switch transistor T1, second opening Close transistor T2, third switching transistor T3, the 4th switching transistor T4, the 5th switching transistor T5 and driving transistor T0 Can be PMOS transistor, and the first end of T0~T5 can be source electrode or the drain electrode of transistor, second end can be crystal The drain electrode of pipe or source electrode, control terminal are the grid of transistor.In other embodiments of the invention, first switch transistor T1, second switch transistor T2, third switching transistor T3, the 4th switching transistor T4, the 5th switching transistor T5 and drive It is NMOS transistor that can have in dynamic transistor T0 at least one.

Fig. 2 is the sequence diagram of the LED control signal Em and scanning signal Sn in the dot structure of Fig. 1, referring to FIG. 2, this Embodiment also provides a kind of driving method of above-mentioned dot structure, includes the following steps:

Initial phase (i.e. t1 periods):The scanning signal Sn at least controls first compensating unit 103 and Two compensating units 104 are connected, and the LED control signal Em at least controls the first switch unit 101 and is connected, described to shine The current potential that diode OLED connects one end of the driving transistor T0 is initialized to the corresponding voltage of the initializing signal Vinit has electric current from the power supply successively through the first switch unit 101, driving transistor T0, first compensating unit 103 and second compensating unit 104 flow to the initializing signal line, with eliminate the driving transistor T0 lag imitate It answers, the current potential that the storage capacitance C connects one end (i.e. b points in Fig. 1) of the driving transistor T0 is the electricity of the power supply Press VDD;

Compensated stage (i.e. t2 periods):It is single that the scanning signal Sn controls the compensation of data receipt unit 105, first Member 103 and the second compensating unit 104 are connected, and the LED control signal Em controls the second switch unit 102 and described the One switch unit 101 ends, and the storage capacitance C connects current potential (the i.e. a in Fig. 1 of one end of the data receipt unit 105 Point) it is mended by described first for the control terminal and second end of the voltage Vdata, the driving transistor T0 of the pixel data signal The conducting of unit 103 is repaid, the current potential of the control terminal of the driving transistor T0 is become described initial by second compensating unit 104 The voltage Vinit, the storage capacitance C for changing signal connect the current potential of one end of the driving transistor T0 by the electricity of the power supply Pressure VDD gradually decreases down Vinit+ | Vth(T0)|,Vth(T0)For the threshold voltage of driving transistor, Vinit believes for the initialization Number voltage;

Glow phase (i.e. t3 periods):It is single that the scanning signal Sn controls the compensation of data receipt unit 105, first Member 103 and the second compensating unit 104 end, and the LED control signal Em controls the second switch unit 102 and described the One switch unit 101 is connected, and the storage capacitance C connects the current potential of one end (i.e. b points in Fig. 1) of the driving transistor T0 Saltus step examines charge conservation on storage capacitance C, the storage capacitance C connections data receiver list to the voltage VDD of the power supply The current potential of one end (i.e. a points in Fig. 1) of member 105 becomes Va=Vdata+Vdd- | Vth(T3)|-Vinit is provided to the drive The control terminal of dynamic transistor T0, the driving transistor T0 conductings, drives the light emitting diode OLED to shine, passes through hair at this time The electric current of optical diode OLED namely by the electric current of driving transistor T0 it is

β/2 Ids=(Vgs(T0)-Vth(T0))2

=β/2 (Vdd-Vdata-Vdd- | Vth(T0)|+Vinit+|Vth(T0)|)2

=β/2 (Vinit-Vdata)2,

From the above equation, we can see that driving the driving current of light emitting diode and the threshold voltage of T0~T5, light emitting diode OLED The voltage at both ends and the IR pressure drops on power vd D are unrelated, thus can eliminate transistor threshold voltage non-uniformity and The influence of IR pressure drops on drift, Organic Light Emitting Diode OLED electric properties heterogeneity and power cord can compensate for threshold value electricity Pressure eliminates IR problem of pressure drop, eliminates light emitting diode OLED ghosts, while eliminating the hysteresis effect of driving transistor T0.In addition, The control signal used in dot structure from sequential it can be seen from the figure that the present embodiment shown in Fig. 2 is few, circuit sequence is simple, holds It easily realizes, so applicability is wider.

The present invention also provides a kind of display devices, including:Above-mentioned dot structure, the scanning for providing scanning signal Sn Line, the light emitting control line for providing LED control signal Em, the data line for providing pixel data signal Vdata are used for The initializing signal line of initializing signal and the power cord for providing supply voltage VDD are provided.The display of the present embodiment fills Setting to be:Oled panel, mobile phone, tablet computer, television set, display, laptop, Digital Frame, navigator etc. are appointed What product or component with display function, the display device can also have the knots such as the outline border of conventional AMOLED display device Structure.

Since the display device of the present embodiment has a dot structure in the present embodiment, thus the uniformity that show of its picture with Stability significantly improves.

With continued reference to FIG. 1, another embodiment of the present invention also provides a kind of dot structure, it is 6T1C structures, specifically includes Light emitting diode OLED, driving transistor T0, storage capacitance C and first to the 5th switching transistor T1~T5, the driving Transistor T0 and first to the 5th switching transistor T1~T5 includes control terminal, first end and second end, wherein institute The second end for stating driving transistor T0 connects one end (i.e. anode) of the light emitting diode OLED, the light emitting diode The other end (i.e. cathode) of OLED connects a reference signal VSS or ground connection, described in the first end connection of the driving transistor T0 One end of the second end of first switch transistor T1 and the storage capacitance C, the driving transistor T0 control terminal (such as The grid of metal-oxide-semiconductor) be separately connected the second end of the second switch transistor T2, the 4th switching transistor T4 first The second end of end and the 5th switching transistor T5;The first end of the first switch transistor T1 connects a power vd D, The control terminal of the first switch transistor T and the control terminal of the second switch transistor T2 access LED control signal Em (connecting same light emitting control line in other words);The first end of the second switch transistor T2 connects the third switching transistor The second end of T3;The first end of the third switching transistor T3 accesses a pixel data signal Vdata and (connects a number in other words According to line), the control terminal of the third switching transistor T3, the control terminal of the 4th transistor T4 and the 5th switch crystal The control terminal access scan signal Sn (connecting same scan line in other words) of pipe T5;The second of the 4th switching transistor T4 End connects the anode of the second end of the driving transistor T0 and the OLED of the light emitting diode;5th switching transistor The first end of T5 connects an initializing signal line (accessing an initializing signal Vinit in other words).

Above-mentioned first switch transistor T1, second switch transistor T2, third switching transistor T3, the 4th switch crystal Pipe T4, the 5th switching transistor T5 and driving transistor T0 can be respectively selected from polycrystalline SiTFT, amorphous silicon membrane Any one in transistor, oxide thin film transistor, Organic Thin Film Transistors.In addition, above-mentioned first switch transistor T1, Second switch transistor T2, third switching transistor T3, the 4th switching transistor T4, the 5th switching transistor T5 and driving are brilliant Body pipe T0 can be PMOS transistor, and the first end of T0~T5 can be source electrode or the drain electrode of PMOS transistor, second end Can be drain electrode or the source electrode of PMOS transistor, control terminal is the grid of PMOS transistor.In the other embodiment of the present invention In, first switch transistor T1, second switch transistor T2, third switching transistor T3, the 4th switching transistor T4, the 5th open It is NMOS transistor that can have in the transistor T5 and driving transistor T0 of pass at least one.

Fig. 2 is the sequence diagram of the LED control signal Em and scanning signal Sn in the dot structure of Fig. 1, referring to FIG. 2, this Embodiment also provides a kind of driving method of above-mentioned dot structure, includes the following steps:

Initial phase (i.e. t1 periods in Fig. 2):The scanning signal Sn at least controls the 4th switch crystal Pipe T4 and the 5th switching transistor T5 conductings, the LED control signal Em at least control the first switch transistor T1 and lead It is logical, such as Sn, Em are low level, T0~T5 is all turned on, and light emitting diode OLED anodes (connect one end of T0, also may be used To say the second end for being T0) current potential is initialized to the corresponding voltage Vinit of the initializing signal, and there is electric current from power vd D Successively through flowing to initializing signal line (i.e. at Vinit in Fig. 1) along T1, T3, T5, the lag effect of driving transistor T0 is eliminated It answers;(i.e. left end node a) voltages Va in Fig. 1 charges to Va=Vdata, storage electricity for one end of storage capacitance C connection T2 and T5 Hold C connect the driving transistor T0 one end (i.e. the voltage of right end node b) in Fig. 1 be Vb=VDD;

Compensated stage (i.e. t2 periods in Fig. 2):The scanning signal Sn controls the third switching transistor T3, the Four switching transistor T4 and the 5th switching transistor T5 conductings, the LED control signal Em control the second switch transistor T2 and first switch transistor T1 cut-offs, such as Sn are low level, and Em is high level, and T4, T5, T3 conducting, T1, T2 are cut Only, storage capacitance C left ends node a point current potential Va are maintained at Va=Vdata, the grid of driving transistor T0 and drain electrode by Data lines It is connected by T4, the grid potential of T0 rapidly goes to Vinit, in similar diode operation state, the i.e. drain and gate of T0 Current potential is identical, is all Vinit, and the source potential (i.e. storage capacitance C right ends node b points current potential) of T0 gradually decreases down Vb by VDD =Vinit+ | Vth(T0)|,Vth(T0)For the threshold voltage of driving transistor T0;

Glow phase (i.e. t3 periods in Fig. 2):The scanning signal Sn controls the third switching transistor T3, the Four switching transistor T4 and the 5th switching transistor T5 cut-offs, the LED control signal control the second switch transistor T2 It is connected with the first switch transistor T1, for example, Em is in low level, Sn is in high level, T1, T2 conducting, the source electrode of T0 Current potential (i.e. storage capacitance C right ends node b points current potential) saltus step considers that charge conservation on storage capacitance C, storage capacitance C are left to VDD End node a point current potentials become Va=Vdata+Vdd- | Vth(T0)|-Vinit, the driving transistor T0 conductings drive the hair Optical diode OLED shines, and is by the electric current of light emitting diode OLED namely by the electric current of driving transistor T0 at this time

β/2 Ids=(Vgs(T0)-Vth(T0))2

=β/2 (Vdd-Vdata-Vdd- | Vth(T0)|+Vinit+|Vth(T0)|)2=β/2 (Vinit-Vdata)2

From the above equation, we can see that threshold voltage, the light emitting diode of the driving current and T0~T5 of driving light emitting diode OLED The voltage at the both ends OLED and the IR pressure drops on power vd D are unrelated, therefore the threshold voltage that can eliminate T0~T5 is non-homogeneous The influence of IR pressure drops, can compensate for T0 in property and drift, Organic Light Emitting Diode OLED electric properties heterogeneity and power cord The threshold voltage of~T5 eliminates the IR problem of pressure drop of power vd D, eliminates light emitting diode OLED ghosts, while it is brilliant to eliminate driving The hysteresis effect of body pipe T0.In addition, the control used in dot structure from sequential it can be seen from the figure that the present embodiment shown in Fig. 2 Signal is few, circuit sequence is simple, easy to implement, so applicability is wider.

In addition, when the dot structure of practical application the present embodiment, the voltage VDD of power supply can be 4.6V, reference signal VSS Can be -3V, the voltage Vdata of pixel data signal is -6.6V~-0.6V.

The present invention also provides a kind of display devices, including:Above-mentioned dot structure, the scanning for providing scanning signal Sn Line, the light emitting control line for providing LED control signal Em, the data line for providing pixel data signal Vdata are used for The initializing signal line of initializing signal and the power cord for providing supply voltage VDD are provided.The display of the present embodiment fills Setting to be:Oled panel, mobile phone, tablet computer, television set, display, laptop, Digital Frame, navigator etc. are appointed What product or component with display function, the display device can also have the knots such as the outline border of conventional AMOLED display device Structure.

Since the display device of the present embodiment has a dot structure in the present embodiment, thus the uniformity that show of its picture with Stability significantly improves.

Obviously, those skilled in the art can carry out invention spirit of the various modification and variations without departing from the present invention And range.If in this way, these modifications and changes of the present invention belong to the claims in the present invention and its equivalent technologies range it Interior, then the present invention is also intended to include these modifications and variations.

Claims (10)

1. a kind of dot structure, which is characterized in that including:Light emitting diode, driving transistor, storage capacitance, data receiver list Member, first switch unit, second switch unit, the first compensating unit and the second compensating unit, wherein
The driving transistor a, including control terminal, a first end and a second end, the second end connection of the driving transistor One end of the light emitting diode, one reference signal of another termination of the light emitting diode or ground connection, the driving crystal Pipe according to the potential difference between the control terminal and the first end for driving the lumination of light emitting diode;
The data receipt unit connects the control terminal of the driving transistor, for providing a pixel according to scan signal Data-signal to the driving transistor control terminal;
The first switch unit is connected between a power cord and the first end of the driving transistor, for receiving the electricity The voltage in source, and the voltage of the power supply is provided to the first of the driving transistor under the control of a LED control signal End;
The second switch unit is connected between the control terminal of the driving transistor and the data receipt unit, is used for The pixel data signal that the data receipt unit receives is sent to the driving crystalline substance under the control of the LED control signal The control terminal of body pipe;
The storage capacitance is connected between the first end of the driving transistor and the data receipt unit;
First compensating unit connects between the second end and control terminal of the driving transistor, second compensating unit One end connects an initializing signal line, and the other end is connected to the control terminal phase of first compensating unit and the driving transistor On one end of connection, first compensating unit is used for the control terminal of the driving transistor under the control of scan signal The electric current flowed out when being turned on or off with second end, and the driving transistor being connected is transmitted through second compensating unit To the initializing signal line;Second compensating unit is used for the initializing signal under the control of the scanning signal The initializing signal that line provides is transmitted to the control terminal of first compensating unit and the driving transistor.
2. dot structure according to claim 1, which is characterized in that the first switch unit includes first switch crystal Pipe, the first switch transistor include a control terminal, a first end and a second end, the control of the first switch transistor End receives the LED control signal, and the first end of the first switch transistor receives the supply voltage, and described first opens The second end for closing transistor connects the first end of the driving transistor.
3. dot structure according to claim 1, which is characterized in that the second switch unit includes second switch crystal Pipe, the second switch transistor include a control terminal, a first end and a second end, the control of the second switch transistor End receives the LED control signal, the first end of the second switch transistor connect the data receipt unit one end and The second end of one end of the storage capacitance, the second switch transistor connects the control terminal of the driving transistor.
4. dot structure according to claim 1, which is characterized in that the data receipt unit includes third switch crystal Pipe, the third switching transistor include a control terminal, a first end and a second end, the control of the third switching transistor End receives the scanning signal, and the first end of the third switching transistor accesses the pixel data signal, and the third is opened The second end for closing transistor connects one end of the second switch unit.
5. dot structure according to claim 1, which is characterized in that first compensating unit includes the 4th switch crystal Pipe, the 4th switching transistor include a control terminal, a first end and a second end, the control of the 4th switching transistor End receives the scanning signal, and the first end of the 4th switching transistor connects the control terminal of the driving transistor, described The second end of 4th switching transistor connects the second end of the driving transistor.
6. dot structure according to claim 1, which is characterized in that second compensating unit includes the 5th switch crystal Pipe, the 5th switching transistor include a control terminal, a first end and a second end, the control of the 5th switching transistor End receives the scanning signal, and the first end of the 5th switching transistor accesses the initializing signal, the 5th switch The second end of transistor connects one end that first compensating unit is connected with the control terminal of the driving transistor.
7. a kind of driving method of dot structure according to any one of claims 1 to 6, which is characterized in that including walking as follows Suddenly:
Initial phase:The scanning signal at least controls first compensating unit and the conducting of the second compensating unit, the hair Optical control signal at least controls the first switch unit conducting, and the light emitting diode connects one end of the driving transistor Current potential be initialized to the corresponding voltage of the initializing signal, have electric current from the power supply successively through the first switch list Member, driving transistor, first compensating unit and second compensating unit flow to the initializing signal line, to eliminate The hysteresis effect of driving transistor is stated, the current potential that the storage capacitance connects one end of the driving transistor is the power supply Voltage;
Compensated stage:The scanning signal controls the data receipt unit, the first compensating unit and the conducting of the second compensating unit, The LED control signal controls the second switch unit and first switch unit cut-off, and the storage capacitance connects institute The current potential for stating one end of data receipt unit is the voltage of the pixel data signal, the control terminal of the driving transistor and the Two ends are connected by first compensating unit, and second compensating unit becomes the current potential of the control terminal of the driving transistor The voltage of the initializing signal, the storage capacitance connect the current potential of one end of the driving transistor by the electricity of the power supply Pressure gradually decreases down Vinit+ | Vth(T0)|,Vth(T0)For the threshold voltage of driving transistor, Vinit is the initializing signal Voltage;
Glow phase:The scanning signal controls the data receipt unit, the first compensating unit and the cut-off of the second compensating unit, The LED control signal controls the second switch unit and first switch unit conducting, and the storage capacitance connects institute The jump in potential of one end of driving transistor is stated to the voltage of the power supply, the storage capacitance connects the data receipt unit The current potential of one end be provided to the control terminal of the driving transistor, the driving transistor conducting drives the light-emitting diodes Pipe shines.
8. a kind of dot structure, which is characterized in that including light emitting diode, driving transistor, storage capacitance and first to Five switching transistors, the driving transistor and first to the 5th switching transistor include control terminal, first end and Second end, wherein the second end of the driving transistor connects one end of the light emitting diode, the light emitting diode it is another One one reference signal of termination or ground connection, the first end of the driving transistor connect the second end of the first switch transistor And one end of the storage capacitance, the control terminal of the driving transistor are separately connected the second of the second switch transistor It holds, the second end of the first end of the 4th switching transistor and the 5th switching transistor;The first switch crystal The first end of pipe connects a power supply, and the control terminal of the first switch transistor accesses a LED control signal;Described second opens The control terminal for closing transistor accesses the LED control signal, and the first end of the second switch transistor connects the third and opens Close the second end of transistor;The first end of the third switching transistor accesses a pixel data signal, and the third switch is brilliant The control terminal of body pipe accesses scan signal;The control terminal of 4th transistor accesses the scanning signal, and the described 4th opens The second end for closing transistor connects the second end of the driving transistor;Described in the control terminal access of 5th switching transistor The first end of scanning signal, the 5th switching transistor connects an initializing signal line.
9. a kind of driving method of dot structure according to any one of claims 8, which is characterized in that include the following steps:
Initial phase:The scanning signal at least controls the 4th switching transistor and the conducting of the 5th switching transistor, institute It states LED control signal and at least controls the first switch transistor turns, the light emitting diode connects the driving transistor The current potential of one end be initialized to the corresponding voltage of the initializing signal, have electric current from the power supply successively through described first Switching transistor, driving transistor, the 4th switching transistor and the 5th switching transistor flow to the initialization letter Number line, to eliminate the hysteresis effect of the driving transistor, the storage capacitance connects the electricity of one end of the driving transistor Position is the voltage of the power supply;
Compensated stage:The scanning signal controls the third switching transistor, the 4th switching transistor and the 5th switch crystal Pipe is connected, and the LED control signal controls the second switch transistor and the first switch transistor cutoff, described to deposit The current potential for storing up one end of third transistor described in capacitance connection is the voltage of the pixel data signal, the driving transistor Control terminal and second end are connected by the 4th switching transistor, and the 5th switching transistor is by the control of the driving transistor The current potential at end processed becomes the voltage of the initializing signal, and the storage capacitance connects the current potential of one end of the driving transistor Vinit+ is gradually decreased down by the voltage of the power supply | Vth(T0)|,Vth(T0)For the threshold voltage of driving transistor, Vinit is The voltage of the initializing signal;
Glow phase:The scanning signal controls the third switching transistor, the 4th switching transistor and the 5th switch crystal Pipe ends, and the LED control signal controls the second switch transistor and the first switch transistor turns, described to deposit The jump in potential of one end of driving transistor described in capacitance connection is stored up to the voltage of the power supply, described in storage capacitance connection The current potential of one end of third switching transistor is provided to the control terminal of the driving transistor, and the driving transistor conducting is driven Move the lumination of light emitting diode.
10. a kind of display device, which is characterized in that including dot structure according to any one of claims 1 to 6, or packet Include dot structure according to any one of claims 8.
CN201810672936.7A 2018-06-26 2018-06-26 Dot structure and its driving method, display device CN108806601A (en)

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