CN110136638A - Active illuminant outside display compensation circuit, drive system and driving signal optimization method - Google Patents

Active illuminant outside display compensation circuit, drive system and driving signal optimization method Download PDF

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Publication number
CN110136638A
CN110136638A CN201910401362.4A CN201910401362A CN110136638A CN 110136638 A CN110136638 A CN 110136638A CN 201910401362 A CN201910401362 A CN 201910401362A CN 110136638 A CN110136638 A CN 110136638A
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China
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oxide
semiconductor
metal
grid
amplifier
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CN201910401362.4A
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Inventor
邓联文
鲁力
廖聪维
罗衡
黄生祥
柯建源
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Central South University
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Central South University
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Priority to CN201910401362.4A priority Critical patent/CN110136638A/en
Publication of CN110136638A publication Critical patent/CN110136638A/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control 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
    • G09G3/22—Control 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
    • G09G3/30—Control 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
    • G09G3/32—Control 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]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control 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
    • G09G3/22—Control 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
    • G09G3/30—Control 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
    • G09G3/32—Control 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]
    • G09G3/3208—Control 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]
    • G09G3/3225—Control 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The invention discloses a kind of active illuminant outside display compensation circuit, drive system and driving signal optimization methods.External compensation circuit of the invention establishes slow-footed problem for low current, electric current, which is accelerated, using current detection module establishes speed, simultaneously using the driving tube in driving signal generation module generation oblique wave, sine wave drive pixel circuit, the unstable problem of compensation loop caused by reducing because of driving current overshoot.Active illuminant circuit of display driving of the invention, can not only keep the stabilization of glow current, additionally it is possible to establish speed with ramp signal or sinusoidal signal accelerated luminescence electric current.

Description

Active illuminant outside display compensation circuit, drive system and driving signal optimization Method
Technical field
The present invention relates to active matrix active illuminant display technologies, and in particular to a kind of external compensation circuit, it may For driving AM-OLED display perhaps AM- μ LED or AM-QLED.
Background technique
Active active display has many advantages, such as that self-luminous, visual angle are wide, contrast is high, fast response time.It is active to have The possibility implementation of source display includes: active matrix light-emitting diode (Active Matrix Organic Light Emitting Diode, AMOLED), the micro- LED of active matrix (micro-LED), active matrix quantum dot LED (AM-QLED).It is main Ejector half active display must be driven by backplane array, and possible driving backboard is thin film transistor (TFT) (Thin Film Transistor), Metal-oxide-semicondutor field-effect tube (metal oxide semiconductor field effect transistor,MOSFET).But under long-time stress, the performance of backplane array may degenerate, such as the threshold value electricity of device Press (VTH) drift, mobility (μ) variation and luminescent device itself degenerate, can all cause active active display picture It is uneven in addition the defects of cannot show.In order to solve this problem, researchers, which propose, can much compensate driving tube electricity Learn the pixel compensation circuit of characteristic variations.However, due to needing additional switching tube and control signal, pixel compensation circuit that can drop Low panel aperture ratio is especially in high-resolution active active display, on the contrary, external compensation circuit passes through external electrical Road compensation driving tube electrology characteristic can increase panel aperture ratio.
There are two types of schemes at present for external compensation circuit, and one is the driving tube electrology characteristic drift values that will test to be stored in In external memory, data voltage is adjusted using algorithm and look-up table and increases or decreases a difference voltage amount on the original basis Δ V, it is aobvious as driving voltage compensation driving tube electrology characteristic variable quantity driving active illuminant using the data voltage after adjusting Show device (AM-OLED, AM- μ LED and AM-QLED) uniformly light-emitting.But this compensation scheme needs additional memory and control Algorithm, it is more complicated.Another scheme is the grid voltage that driving tube is constantly adjusted using loop feedback mechanism, finally makes to drive Dynamic tube current is equal to data current to be influenced without being changed by electrology characteristic.Fig. 1 illustrates typical active illuminant display Loop feedback compensation circuit structure, it can be seen that loop feedback compensation scheme does not need external memory and control algolithm, circuit Structure is simple, easy to accomplish, but in loop feedback compensation scheme, and the parasitic capacitance on data line will cause driving tube current Foundation slows.Fig. 2 illustrates active illuminant display loop feedback compensation electricity traditional in the case of different parasitic capacitances Different driving tube current corresponding settling time in road, it can be seen that driving tube current settling time is very long especially in low current In the case where big parasitic capacitance.The main reason for causing this problem is that parasitic capacitance exists, and feedback current is first to parasitic electricity Then capacity charge passes to external drive circuit again.And the increasing of the size and resolution ratio with active illuminant display panel Add, this problem can be more serious.Another problem of loop feedback compensation scheme is promptly to regulate and control driving tube with square-wave signal Grid voltage can make to drive the serious overshooting problem of tube current that feedback loop stable is caused to be deteriorated.
In view of the above-mentioned problems, one can either accurately compensate the variation of driving tube electrology characteristic, and driving tube electricity can be accelerated Stream establishes speed but also can reduce the external compensation circuit of driving tube current over pulse amplitude stabilization compensation loop, it will promotes Active illuminant display (AM-OLED, AM- μ LED and AM-QLED) more likely becomes next-generation mainstream display technology.
Summary of the invention
For active illuminant display small current establish that speed is slow and driving tube in current over pulse problem, the present invention A kind of active illuminant outside display compensation circuit, drive system and driving signal optimization method are devised, it can either add The small program current of speed establishes speed, and can reduce the amplitude of current over pulse in driving tube, additionally it is possible to compensate display surface Plate shows non-uniform phenomenon.
In order to achieve the above technical purposes, the technical scheme is that,
A kind of active illuminant outside display compensation circuit is electrically connected including mutually by data line and feedback line outer Portion's driving circuit and pixel circuit, the external drive circuit include:
Data current generation module, for being converted into corresponding to by the data voltage that vision signal is converted to by what is received Data current, and data current is passed into current detection module and Current Voltage conversion module；
Current detection module, in programming phases in prestoring a reference voltage on feedback line, to accelerate pixel circuit The feedback current for feeding back to external drive circuit establishes speed；
Current Voltage conversion module, for by the difference between feedback current provided by data current and current detection module Value electric current is converted to voltage signal with control switch control module；
Reference voltage module, for providing a reference voltage to Current Voltage conversion module and current detection module；
Driving signal generation module, for generating the driving signal for being suitable for external compensation circuit；
Switch control module drives when Current Voltage conversion module, which generates voltage signal, acts on the module for controlling Charging process of the dynamic signal to driving tube；
The pixel circuit includes:
Switching tube is incited somebody to action for connecting pixel circuit and external drive circuit in programming phases, and in light emitting phase The two disconnects；
Storage capacitance forms driving voltage for storing corresponding driving signal voltage, and in light emitting phase to driving tube Driving voltage is provided；
Driving tube generates driving electricity for receiving the driving voltage of storage capacitance storage, and under the action of power module Stream promotes luminescent device to shine.Wherein thin film transistor (TFT) realization can be used in driving tube.
Luminous tube for receiving the driving current of driving tube offer, and is generated according to the size of driving current different bright Degree.Luminescent device in luminous tube namely Fig. 3.
A kind of active illuminant outside display compensation circuit, in the external drive circuit, data current Generation module includes current signal source, and the first end in current signal source connects power supply, and second end connects Current Voltage conversion module In the first amplifier positive terminal and current detection module；Reference voltage module includes reference voltage source, reference voltage source and first Amplifier is connected with the negative phase end of the second amplifier in current detection module；Driving signal generation module includes for generating ramp signal With the voltage signal source of sinusoidal signal, voltage signal source one end is connect with the drain electrode of third metal-oxide-semiconductor in switch control module, another Terminate the output end of peripheral circuit.
A kind of active illuminant outside display compensation circuit, in the external drive circuit, current detecting mould Block includes the second amplifier, the first metal-oxide-semiconductor and the second metal-oxide-semiconductor；The reverse side of second amplifier is connected to reference voltage module, positive terminal It is connected to the drain terminal of the first metal-oxide-semiconductor and the drain terminal of first switch tube, the grid phase of output end and the first metal-oxide-semiconductor and the second metal-oxide-semiconductor Even, the drain electrode of the first metal-oxide-semiconductor is connected with the source electrode of the positive terminal of the second amplifier and first switch tube, and source electrode is grounded, grid and The grid of 2nd MOS pipe and the output end of the second amplifier are connected, the drain electrode of the second metal-oxide-semiconductor and the second end in current signal source It is connected, source electrode ground connection, grid is connected with the output end of the first metal-oxide-semiconductor and the second amplifier；Current Voltage conversion module includes the One amplifier and first resistor, the reverse side of the first amplifier are connected to the second end of reference voltage module and first resistor, positive terminal It is connected with the second end of the first end of first resistor and current signal source, output end is connected to the 3rd MOS of switch control module The grid of pipe, the first end of first resistor are connected with the second end of the positive terminal of the first amplifier and current signal source, second end It is connected with the reverse side of the first amplifier and reference voltage module；Switch control module includes third metal-oxide-semiconductor, the 3rd MOS pipe Drain electrode connect with driving signal generation module, the drain electrode of source electrode and first switch tube connection, grid is by the first amplifier output end Control.
A kind of active illuminant outside display compensation circuit, in the external drive circuit, current detecting mould Block includes the second amplifier, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor；The reverse side of second amplifier connects To reference voltage module, positive terminal is connected to the drain terminal of the first MOS pipe and the drain terminal of first switch tube, output end and the first MOS Pipe is connected with the grid of the second metal-oxide-semiconductor, drain electrode and the positive terminal of the second amplifier and the source electrode of first switch tube of the first metal-oxide-semiconductor It is connected, source electrode is connected with the drain electrode of the 4th metal-oxide-semiconductor, and grid is connected with the output end of the grid of the second metal-oxide-semiconductor and the second amplifier, The drain electrode of second metal-oxide-semiconductor is connected with the second end in current signal source, and source electrode is connected to the drain gate and the 4th of the 5th metal-oxide-semiconductor The grid of metal-oxide-semiconductor, grid are connected with the output end of the first metal-oxide-semiconductor and the second amplifier, and the grid of the 4th metal-oxide-semiconductor is connected to the 5th The source electrode of the grid of metal-oxide-semiconductor and drain electrode and the second metal-oxide-semiconductor, the drain electrode of the 4th metal-oxide-semiconductor are connected to the source electrode of the first metal-oxide-semiconductor, the The source electrode of four metal-oxide-semiconductors is connected to ground；The grid of 5th metal-oxide-semiconductor and drain electrode are connected to the source electrode and the 4th MOS of the 2nd MOS pipe The source electrode of the grid of pipe, the 5th metal-oxide-semiconductor is connected to ground；Current Voltage conversion module includes the first amplifier, first resistor and second Resistance, the reverse side of the first amplifier are connected to the second end of reference voltage module and first resistor, positive terminal and first resistor First end and the second end in current signal source are connected, and output end is connected to the grid of switch control module third metal-oxide-semiconductor, and first The first end of resistance is connected with the second end of the positive terminal of the first amplifier and current signal source, and second end is anti-with the first amplifier Xiang Duan and reference voltage module are connected, and the first end of second resistance is connected to the output end and the 3rd MOS of the first amplifier The grid of pipe, the second end of second resistance are connected to the second end of first resistor and the negative phase end and reference voltage of the first amplifier Module；Switch control module includes third metal-oxide-semiconductor, and the drain electrode of third metal-oxide-semiconductor is connect with driving signal generation module, source electrode and The drain electrode of one switching tube connects, control of the grid by the first amplifier output end.
A kind of active illuminant outside display compensation circuit, in the external drive circuit, current detecting mould Block includes the second amplifier, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor；The reverse side of second amplifier connects To reference voltage module, positive terminal is connected to the drain terminal of the first MOS pipe and the drain terminal of first switch tube, output end and the first MOS Pipe is connected with the grid of the second metal-oxide-semiconductor, drain electrode and the positive terminal of the second amplifier and the source electrode of first switch tube of the first metal-oxide-semiconductor It is connected, source electrode is connected with the drain electrode of the 4th metal-oxide-semiconductor, grid and the grid of the second metal-oxide-semiconductor and the output end phase of the second amplifier Even, the drain electrode of the second metal-oxide-semiconductor is connected with the second end in current signal source, the drain gate and the 4th of source electrode and the 5th metal-oxide-semiconductor The grid of metal-oxide-semiconductor is connected, and grid is connected with the output end of the first metal-oxide-semiconductor and the second amplifier, the grid connection of the 4th metal-oxide-semiconductor The source of the first metal-oxide-semiconductor is connected to the grid of the 5th metal-oxide-semiconductor and drain electrode and the source electrode of the second metal-oxide-semiconductor, the drain electrode of the 4th metal-oxide-semiconductor The source electrode of pole, the 4th metal-oxide-semiconductor is connected to ground；The grid of 5th metal-oxide-semiconductor and drain electrode are connected to the source electrode and of the 2nd MOS pipe The source electrode of the grid of four metal-oxide-semiconductors, the 5th metal-oxide-semiconductor is connected to ground；Current Voltage conversion module includes the first amplifier, the first amplifier Reverse side is connected to reference voltage module, and positive terminal connects the second end in current signal source, and output end is connected to switch control mould The grid of the 7th metal-oxide-semiconductor of block and the input terminal of phase inverter；Switch control module includes the 6th metal-oxide-semiconductor, the 7th metal-oxide-semiconductor and reverse phase Device, the input terminal of phase inverter are connected to the grid of the 7th metal-oxide-semiconductor and the output end of the first amplifier, the output end connection of phase inverter the The grid of six metal-oxide-semiconductors；The grid of 6th metal-oxide-semiconductor is connected to the output end of phase inverter, and the drain electrode of the 6th metal-oxide-semiconductor is connected to second switch The source electrode of the drain terminal of pipe and the 6th metal-oxide-semiconductor, the 6th MOS pipe source are connected to the leakage in drive voltage signal source and the 7th metal-oxide-semiconductor Pole；The grid of 7th metal-oxide-semiconductor is connected to the output end of the first amplifier and the input terminal of phase inverter, and the drain electrode of the 7th metal-oxide-semiconductor is connected to The source electrode in drive voltage signal source and the 6th metal-oxide-semiconductor, the 7th metal-oxide-semiconductor source electrode are connected to drain electrode and the 6th MOS of second switch The drain electrode of pipe.
A kind of active illuminant outside display compensation circuit, in the external drive circuit, current detecting mould Block includes the second amplifier, the first metal-oxide-semiconductor and the second metal-oxide-semiconductor；The reverse side of second amplifier is connected to reference voltage module, positive terminal It is connected to the drain terminal of the first metal-oxide-semiconductor and the drain terminal of first switch tube, the grid phase of output end and the first metal-oxide-semiconductor and the second metal-oxide-semiconductor Even, the drain electrode of the first metal-oxide-semiconductor is connected with the source electrode of the positive terminal of the second amplifier and first switch tube, and source electrode is grounded, grid and The grid of 2nd MOS pipe and the output end of the second amplifier are connected, the drain electrode of the second metal-oxide-semiconductor and the second end in current signal source It is connected, source electrode ground connection, grid is connected with the output end of the first metal-oxide-semiconductor and the second amplifier；Current Voltage conversion module includes the One amplifier, the reverse side of the first amplifier are connected to reference voltage module, and positive terminal connects the second end in current signal source, output end Be connected to the grid of switch control module third metal-oxide-semiconductor, switch control module includes third metal-oxide-semiconductor, the drain electrode of third metal-oxide-semiconductor with The connection of driving signal generation module, the drain electrode connection of source electrode and first switch tube, control of the grid by the first amplifier output end.
A kind of active illuminant outside display compensation circuit, in the external drive circuit, current detecting mould Block includes the second amplifier and the first metal-oxide-semiconductor；The positive terminal of second amplifier is connected to the drain electrode and first switch tube of the first MOS pipe Source electrode, negative phase end is connected to reference voltage module, and output end is connected to the grid of the first metal-oxide-semiconductor；The grid of first metal-oxide-semiconductor connects It is connected to the output end of the second amplifier, the drain electrode of the first metal-oxide-semiconductor is connected to the positive terminal of the second amplifier and the source of first switch tube Pole, the source electrode of the first metal-oxide-semiconductor are connected to the second end of programmable current source and the positive terminal of the second amplifier；Current Voltage modulus of conversion Block includes the first amplifier, and the reverse side of the first amplifier is connected to reference voltage module, and positive terminal connects the second of current signal source End, output end are connected to the grid of the second metal-oxide-semiconductor of switch control module, and switch control module includes the second metal-oxide-semiconductor, the 2nd MOS The drain electrode of pipe is connect with driving signal generation module, and the drain electrode connection of source electrode and first switch tube, grid is exported by the first amplifier The control at end.
A kind of active illuminant outside display compensation circuit, in the pixel circuit, switching tube includes first Switching tube and second switch, first switch tube source are coupled to the drain terminal of the first metal-oxide-semiconductor and the positive terminal of the second amplifier, and first The drain terminal of switching tube is coupled to the first end of the source of driving tube, storage capacitance second end and luminous tube, and control terminal is coupled to Row scan control signal line, the drain terminal of second switch are coupled to the source of switch control module third metal-oxide-semiconductor, second switch Source be coupled to the grid of driving tube, control terminal is coupled to row scan control signal line；The drain electrode of the driving tube couples To power module, grid is coupled to the source electrode of second switch and the first end of storage capacitance, and source electrode is coupled to first switch tube Drain electrode and luminous tube first end；The first end of the luminous tube is connected to the source electrode of driving tube and the leakage of first switch tube Pole, it is extreme that the second end of luminous tube is connected to common electrical；Storage capacitance first end is coupled to the grid and second switch of driving tube The source electrode of pipe, storage capacitance second end are coupled to the leakage of the source electrode of driving tube and the first end of luminous tube and first switch tube Pole.
A kind of active illuminant outside display compensation circuit, which is characterized in that in the pixel circuit, switch Pipe includes first switch tube and second switch, and first switch tube source is coupled to the drain terminal and the second amplifier of the first MOS pipe Positive terminal, the drain terminal of first switch tube are coupled to the source of driving tube and the first end of luminous tube, and control terminal, which is coupled to row, sweeps Control signal wire is retouched, the drain terminal of second switch is coupled to the source of switch control module third metal-oxide-semiconductor, the source of second switch The grid of driving tube is coupled at end, and control terminal is coupled to row scan control signal line；The source electrode of the driving tube is coupled to electricity Source module and storage capacitance second end, grid are coupled to the source electrode of second switch and the first end of storage capacitance, source electrode coupling To the drain electrode of first switch tube and the first end of luminous tube；The first end of the luminous tube is connected to the source electrode and of driving tube The drain electrode of one switching tube, it is extreme that the second end of luminous tube is connected to common electrical；Storage capacitance first end is coupled to the grid of driving tube The drain electrode of pole and second switch, the storage capacitance second end are coupled to the source electrode and power module of driving tube.
A kind of active illuminant display driving system is based on circuit above-mentioned, comprising:
Active illuminant display panel, display panel include the pixel of N × M OLED, μ LED or QLED, and with picture N number of row control signal wire vertically of vegetarian refreshments connection and the M column data drive in the horizontal direction connect with pixel Moving-wire and M column feedback driving line；
Gate driving circuit generates the row control signal moved in the vertical direction, and passes through different row control signals The corresponding pixel unit of line traffic control and external drive circuit connect or disconnect；
Source electrode drive circuit, for generating the data drive voltage signal with compensation function of corresponding different grayscale, and Corresponding pixel is passed to by the data-driven line of different lines, different image informations is shown and compensation panel is shown not Uniformity.
Clock control circuit, for generate in entire drive system the clock signal in need used.
Slope signal generating circuit provides drive voltage signal for generating ramp signal.
Sine wave signal generation circuit provides drive voltage signal for generating sine wave signal substitution ramp signal.
Power circuit, for generate in drive system the supply voltage in need used.
Above-mentioned this drive system contains external compensation circuit, and external compensation circuit is the one of drive system in other words A part.Active illuminant display shows that good image quality is entire drive system work as a result, and external compensation Circuit is even more important.More particularly external compensation circuit is comprised in source electrode drive circuit, and external compensation circuit is source electrode A function module circuit in driving circuit.Gate driving circuit cooperation is needed to open a line when the work of external compensation circuit Furthermore pixel is also required to display panel, clock, power supply cooperation etc., these circuits cooperate to complete the normal of display jointly Display.
A kind of driving signal optimization method of active illuminant outside display compensation circuit, based on circuit above-mentioned, Driving signal generation module generates different driving signal: ramp signal and sine wave drive signal, in which:
In programming phases, after the first, second switching tube connects external drive circuit with pixel circuit, ramp signal conduct Driving signal adjusts electric current in driving tube and gradually approaches data current, reduce electric current in driving tube to the gate charges of driving tube Since grid voltage changes the too fast situation for causing loop caused by overshoot unstable；
Driving signal generation module uses sine wave signal substitution ramp signal to fill as grid of the driving signal to driving tube Electricity；
Quadratic function signal, exponential signal are generated as driving signal using driving signal generation module, accelerate driving tube Electric current establishes the fluorescent lifetime that speed increases pixel in panel.
The optimization method of above-mentioned this driving signal is the operating rate in order to improve circuit.Because active illuminant is aobvious Show its internal parasitic amount of device, such as parasitic capacitance is very big, this will lead to the slow problem of settling time during signal driving, such as The relational graph of settling time and data current in the case of difference parasitic capacitance shown in Fig. 2, the smallest settling time is theoretically More than 50 μ s, this will limit one of the increase of the resolution ratio and size of display, the external compensation circuit advantage in this patent Exactly solve the problems, such as that this settling time is slow.However, it is also possible to which further increasing circuit operating rate reduces settling time, i.e., By the optimization to driving signal, we can be further improved the speed of circuit after this method optimization, as shown in figure 11, After driving signal optimization, settling time is theoretically reduced within 3 μ s
Add the technical effects of the invention are that current detection module method of pre-stored reference voltage on feedback line is utilized The program speed of fast-circuit；Reduce driving tube electricity using the ducting capacity that the method that driving voltage is gradually increasing adjusts driving tube again It flows through and rushes amplitude.The circuit had both compensated for caused by driving tube electrology characteristic and luminescent device are degenerated in active illuminant display The problem of showing non-uniform problem, in turn avoiding driving tube current over pulse enhances the stability of loop.
Detailed description of the invention
After compareing attached drawing and reading a specific embodiment of the invention in detail, reader will the clearer understanding present invention The feature and advantage of the circuit of design:
Fig. 1 illustrates typical active illuminant display loop feedback compensation circuit structural schematic diagram in prior art；
Fig. 2 illustrates the relational graph under different parasitic capacitances in driving tube between electric current settling time and data current；
Fig. 3 illustrates the external compensation circuit structure block diagram of the embodiment of the present invention one；
Fig. 4 illustrates the external compensation circuit physical circuit figure of the embodiment of the present invention one；
Fig. 5 illustrates the external compensation circuit timing diagram of the embodiment of the present invention one；
Fig. 6 illustrates the external compensation circuit physical circuit figure of the embodiment of the present invention two；
Fig. 7 illustrates the external compensation circuit physical circuit figure of the embodiment of the present invention three；
Fig. 8 illustrates the external compensation circuit physical circuit figure of the embodiment of the present invention four；
Fig. 9 illustrates the external compensation circuit physical circuit figure of the embodiment of the present invention five；
Figure 10 illustrates the external compensation circuit timing diagram of sinusoidal signal driving of the invention；
When Figure 11 illustrates ramp signal of the invention, sinusoidal signal driving, the transient response figure of tube current is driven；
Figure 12 illustrates a kind of active illuminant display drive system structure chart of the invention.
Wherein, IDATAFor current signal source, AMP1 is the first amplifier, and AMP2 is the second amplifier, VDRIVERFor voltage signal Source, RFFor resistance, RF1For first resistor, RF2For second resistance, VREFFor voltage source, VSCANFor switch control signal line, Data Line is data line, and Feeback Line is feedback line, M1For the first metal-oxide-semiconductor, M2For the second metal-oxide-semiconductor, M3For third metal-oxide-semiconductor, M4 For the 4th metal-oxide-semiconductor, M5For the 5th metal-oxide-semiconductor, M31For the 6th metal-oxide-semiconductor, M32For the 7th metal-oxide-semiconductor, T1For first switch tube, T2It is Two switching tubes.
Specific embodiment
In order to keep techniques disclosed in this application content more detailed with it is complete, can refer to attached drawing and of the invention following Various specific embodiments, identical label represents the same or similar component in attached drawing.However, those skilled in the art It should be appreciated that embodiment provided hereinafter is not intended to limit the invention covered range.In addition, attached drawing is used only for It is schematically illustrated, and is drawn not according to its full size.
For active illuminant display small current establish that speed is slow and driving tube in current over pulse problem, the present invention A kind of external compensation circuit and drive system are devised, it can either accelerate the speed of establishing of small program current, and can subtract The amplitude of current over pulse in small driving tube, additionally it is possible to compensate display pannel and show non-uniform phenomenon.
First point according to the present invention, a kind of external compensation circuit of active illuminant display is devised, outside is related to Driving circuit and pixel circuit, wherein external drive circuit includes: data current generation module, for the data received are electric Pressure is converted into corresponding data current, and data current is passed to external drive circuit；Current detection module, for programming Stage prestores a reference voltage on feedback line, and accelerate feedback current establishes speed；Current Voltage conversion module, being used for will Difference current between data current and feedback current is converted to voltage signal control switch；Reference voltage module, for electricity It flows voltage transformation module and current detection module provides a reference voltage；Switch control module has voltage signal to act on this When module, switch control module controls driving signal to the charging process of driving tube；Driving signal generation module, it is suitable for generating For the driving signal of external compensation circuit, such as: ramp signal, sinusoidal signal etc..Pixel circuit includes: switching tube, is used for Pixel circuit and external drive circuit are connected in programming phases, light emitting phase disconnects the two；Storage capacitance, for depositing It stores up corresponding driving signal voltage and forms driving voltage, and provide driving voltage to driving tube in light emitting phase；Driving tube is used for The driving voltage of storage capacitance storage is received, and under the action of power module, generates driving current and luminescent device is promoted to shine； Luminous tube for receiving the driving current of driving tube offer, and generates the brightness of different grayscale.
Second point according to the present invention devises a kind of drive system, is related to: active illuminant display panel, display surface Plate includes N × M pixel (OLED, μ LED and QLED), and the N number of row control signal vertically connecting with pixel Line and the M column data driving line and M feedback driving line in the horizontal direction being connect with pixel；Gate driving circuit, Generate the row control signal moved in the vertical direction, and by different row control signal wire control corresponding pixel unit with External drive circuit connects or disconnects；Source electrode drive circuit, for generating the number with compensation function of corresponding different grayscale Corresponding pixel is passed to according to drive voltage signal, and by the data-driven line of different lines, shows different image informations And the inhomogeneities that compensation panel is shown；Clock control circuit, for generate in entire drive system it is in need use when Clock signal；Ramp signal generating circuit provides drive voltage signal for generating ramp signal.Sine wave signal generation circuit, Drive voltage signal is provided for generating sine wave signal substitution ramp signal；Power circuit, for generating institute in drive system The supply voltage in need used.
It is according to the present invention thirdly, propose a kind of driving signal of the external compensation circuit of active illuminant display Optimization method, which is characterized in that driving signal generation module generates different driving signal: ramp signal, sine wave drive signal, Wherein:
In programming phases, after the first, second switching tube connects external drive circuit with pixel circuit, ramp signal conduct Driving signal adjusts electric current in driving tube and gradually approaches data current, reduce electric current in driving tube to the gate charges of driving tube Since grid voltage changes the too fast situation for causing loop caused by overshoot unstable；
Driving signal generation module uses sine wave signal substitution ramp signal to fill as grid of the driving signal to driving tube Electricity, in driving tube electric current establish speed compare ramp signal driving when faster, driving tube current over pulse does not influence loop Stability, sine wave is more common compared to ramp signal and is easy to produce；
According to the method for this signal optimization, under the premise of not influencing the stability of loop, we can also utilize driving Signal generator module generates quadratic function signal, exponential signal as driving signal, and driving tube current is accelerated to establish speed increase The fluorescent lifetime of pixel in panel.Because quadratic function signal and exponential signal are than ramp signal and sinusoidal signal, in unit The change rate of interior voltage amplitude is big.
Original current programmed type circuit is as shown in Figure 1, its course of work is broadly divided into programming phases and light emitting phase.? Programming phases, Select 1 are high by T1、T2Pipe is opened, and Select 2 is low by T3Pipe is closed.Electric current I in driving tubeDBy A Point is first to parasitic capacitance C on feedback lineFPCharging, due to IDIt is worth very little (A grades of μ) and needs the longer charging time, this makes to program Time increases fluorescent lifetime and reduces.Work as CFPAfter upper voltage stabilization, IDIt is transmitted to B point and data current IDATACompare, comparison result The ducting capacity that voltage signal adjusts driving tube is formed, which makes I fastlyDVariation is generated and is substantially spent rapidly Punching increases the unstability of compensation loop.
Main thought of the invention is, in order to solve the problems, such as that electric current settling time is longer, to avoid IDFirst to parasitic electricity Hold CFPIt charges and allows IDThe reversed feedback of fast direct is made using current detection module by prestoring a fixed voltage on feedback line IDRapid feedback detection；In order to solve IDVariation generates significantly overshooting problem rapidly, reduces drive voltage signal rate of change and increases Add compensation loop to stablize, the ducting capacity of driving tube is adjusted using the voltage signal that slope substitution comparator generates, makes ID gradually Variation reduces current over pulse amplitude.
Embodiment one:
Fig. 3 is the external compensation circuit structure block diagram of the embodiment of the present application one, comprising: external drive circuit includes: data Current generating module for the data voltage received to be converted into corresponding data current, and data current is passed to outside Portion's driving circuit；Current detection module accelerates feedback current for prestoring a reference voltage on feedback line in programming phases Establish speed；Current Voltage conversion module, for the difference current between data current and feedback current to be converted to voltage Signal-controlled switch；Reference voltage module, for providing one to Current Voltage conversion module and second generation current transmission device module A reference voltage；Switch control module, when having voltage signal to act on the module, switch control module controls driving signal to drive The charging process of dynamic pipe；Driving signal generation module, for generate be suitable for external compensation circuit driving signal, such as: tiltedly Slope signal, sinusoidal signal etc..Pixel circuit includes: switching tube, in programming phases by pixel circuit and external drive circuit It connects, light emitting phase disconnects the two；Storage capacitance forms driving voltage for storing corresponding driving signal voltage, And driving voltage is provided to driving tube in light emitting phase；Driving tube, for receiving the driving voltage of storage capacitance storage, and in electricity Under the action of source module, generates driving current and luminescent device is promoted to shine；Luminous tube, for receiving the driving electricity of driving tube offer Stream, and generate the brightness of different grayscale.
Fig. 4 illustrates the external compensation circuit physical circuit figure of the embodiment of the present application one, corresponding, and data current generates mould Block includes programmable current source IDATA；Current detection module includes amplifier AMP2, MOS pipe M1、M2And ground wire；Current Voltage conversion Module includes amplifier AMP1, resistance RF；Reference voltage module includes voltage source VREF；Switch module metal-oxide-semiconductor M3；Driving signal generates Module includes voltage signal source VDRIVER；There are dead resistance R on external drive circuit and connecting line between pixel circuitDP、 RFP, parasitic capacitance CDP、CFP；Switching tube includes TFT pipe T1、T2And switch control signal line VSCAN；Storage capacitance is capacitor CS；It drives Dynamic pipe includes TFT pipe TD；Power module includes voltage source VDD；Luminous tube, including light-emitting component OLED and public power polar curve VSS。
Specific connection relationship is between device in each module: programmable current source first end is connected to power supply VDD, second end company It is connected to resistance RFFirst end and metal-oxide-semiconductor M2Drain terminal, tie point be first node A；The negative phase end of amplifier AMP2 is connected to voltage Source VREF, positive terminal is connected to metal-oxide-semiconductor M1Drain terminal and switch transistor T1Source, tie point is second node B, and output end is connected to Metal-oxide-semiconductor M1、M2Grid, tie point be third node C；Metal-oxide-semiconductor M1Grid be connected to the output end and M of amplifier AMP22's Grid, drain electrode are connected to the positive terminal and switch transistor T of amplifier AMP21Source electrode, source electrode ground connection；The negative of amplifier AMP1 terminates Voltage source VREFWith resistance RFSecond end, positive terminating resistor RFFirst end and current source second end and M2Drain terminal, Output termination metal-oxide-semiconductor M3Grid；Metal-oxide-semiconductor M3The grid of pipe connects the output end of amplifier AMP1, and drain electrode meets voltage signal source VDRIVER, Source electrode connects switch transistor T2Drain electrode；Voltage signal source VDRIVERMeet M3Drain electrode；Pass through number between external drive circuit and pixel circuit It is connected according to line Data Line with feedback line Feedback Line, dead resistance R is respectively present on data line and feedback lineDP、RFP With parasitic capacitance CDP、CFP；Switch transistor T1Drain electrode be coupled to driving tube TDSource electrode, luminous tube OLED first end, storage electricity Hold CSSecond end and driving tube TDSource electrode, switching node be fourth node D, switch transistor T1Source electrode be coupled to M1Leakage The positive terminal of pole and amplifier AMP2, switching node are second node B, switch transistor T1Grid be coupled to switch T2Grid with And switch control signal line VSCAN；Switch transistor T2Drain electrode be coupled to M3The source electrode of pipe, T2Source electrode is coupled to storage capacitance CS? One end and driving tube TDGrid, switching node G, switch transistor T2Grid be coupled to switch T1Grid and switch control Signal wire V processedSCAN；Storage capacitance CSFirst end be coupled to T2Source electrode and driving tube grid, storage capacitance CSSecond End is coupled to T1Drain electrode, luminous tube OLED first end and TDSource electrode；Driving tube TDGrid be coupled to T2Source electrode with And CSFirst end, drain electrode be coupled to voltage source VDD, source electrode is coupled to CSSecond end, T1Drain electrode and OLED first End；Voltage source VDDIt is connected to driving tube TDDrain electrode；The first end of luminous tube OLED is coupled to T1Drain electrode, CSSecond end, TD Source electrode, second end is coupled to public power polar curve VSS。
The course of work of the present embodiment can be divided into two stages, i.e. programming phases and light emitting phase.Fig. 5 illustrates this The working timing figure of embodiment describes the present embodiment below in conjunction with Fig. 5 in detail.
Programming phases, row scanning switch control signal wire VSCANExport high level, the first switch tube T1, second switch Pipe T2Responding to switch control signal is opened respectively, and external drive circuit is connected by data line with feedback line with pixel circuit, instead Pre-stored reference voltage V on feeder lineREF, VREFLess than OLED threshold voltage and VSSSum, driving tube TDMiddle electric current IDPass through feedback line It directly charges to second node B, B point voltage increases, and otherwise B point voltage is equal to reference voltage VREF.When B point voltage is greater than reference When voltage, amplifier AMP2 exports high level for metal-oxide-semiconductor M1And M2It opens, electric current IDIt is copied to M2In, while to first node A Electric discharge, current source IDATAIt charges to node A, if fruit electric current IDEqual to data current IDATA, then node A voltage is equal to reference voltage VREF, otherwise node A voltage is greater than reference voltage VREF, amplifier AMP1 exports high level for metal-oxide-semiconductor M3It opens, driving voltage letter Number source VDRIVERGate node G charging to driving tube TD, until electric current I in driving tubeDEqual to data current IDATA, amplifier AMP1 Low level is exported by M3Pipe is closed.At the end of programming phases, electric current is data current I in driving tubeDATA, so the circuit can To compensate the variation of driving tube threshold voltage and mobility.
Light emitting phase, row scanning switch control signal wire VSCANExport low level, the first switch tube T1, second switch Pipe T2It closes, external drive circuit and pixel circuit disconnect.The gate source voltage of driving tube is maintained at storage capacitance CSIn, continue to drive Dynamic driving TDStabling current I is providedD, luminous tube OLED continuous uniform is maintained to shine.
Beneficial effect
First, the external compensation circuit of the present embodiment is to compensate driving tube threshold voltage and migration based on current programmed The degeneration of rate and compensation precision is high；Second, in programming phases, due to current detection module on feedback line pre-stored reference voltage VREF, reduce the influence that parasitic capacitance establishes speed to electric current, improve electric current I in driving tubeDSpeed is established on feedback line； Third, drive voltage signal VDRIVERSubstitution square wave gradually changes driving tube TDGrid voltage, reduce driving tube in electric current IDIt crosses Amplitude is rushed, the stability of loop feedback compensation circuit is improved.
Embodiment two:
The structural block diagram of the present embodiment external compensation circuit is the same as example 1, and equally includes: that data current generates mould Block, current detection module, Current Voltage conversion module, reference voltage module, switch control module, driving signal generation module, Switching tube, storage capacitance, driving tube and luminous tube.Wherein data current generation module, current detection module, Current Voltage Conversion module, reference voltage module, switch control module, driving signal generation module, switching tube, storage capacitance, driving tube, with And the connection relationship between luminous tube is the same as example 1, and is not repeated herein and is repeated.
Fig. 6 is the external compensation circuit physical circuit figure of the embodiment of the present application two.Embodiment two and embodiment as shown in Figure 6 One the difference is that increase metal-oxide-semiconductor M in current detection module4、M5, resistance is increased in Current Voltage conversion module RF2.Increase resistance RF2The reason of be to the amplifier AMP1 and resistance R in Current Voltage conversion moduleF1Negative-feedback is introduced, makes to transport The output for putting AMP1 can quickly jump to low level, the reaction speed of accelerating circuit in high level；Increase M4And M5The reason of be Simple current mirror is substituted using wilson current mirror in current detection module, reduces node A voltage to feedback current IFBInfluence, The precision of feedback current is improved, but the present embodiment also has the increased disadvantage of power consumption.M4Grid be connected to M5Grid and drain electrode with And M2Source electrode, M4Drain electrode be connected to M1Source electrode, M4Source electrode be connected to ground；M5Grid and drain electrode be connected to M2Source electrode And M4Grid, M5Source electrode be connected to ground；Resistance RF2First end be connected to the output end and M of amplifier AMP13Grid Pole, resistance RF2Second end be connected to resistance RF1Second end and amplifier negative phase end and reference voltage VREF。
The present embodiment external compensation circuit works in programming phases, drives tube current IDAllocate AMP2 output height by M1、 M2It opens, M4、M5Pipe then turns on, by IDCopy to M2And M5Guan Zhong, and the M in wilson current mirror structure2Drain voltage Variation will not influence feedback current IFBPrecision, IFBWith IDATAMake poor, difference current I in node AERRPass through amplifier AMP1, RF1、 RF2Composition is converted to voltage signal control M with the amplifier of feedback3Opening state, VDRIVERPass through M3Pipe acts on node G, It adjusts driving tube ducting capacity and realizes compensation function.And light emitting phase is identical with embodiment one, also will not be repeated again here It repeats.
Beneficial effect
First, the external compensation circuit of the present embodiment is to compensate driving tube threshold voltage and migration based on current programmed The degeneration of rate and compensation precision is high；Second, negative-feedback is added in this implementation in Current Voltage conversion module, improves switch module M3 Switching speed；Third substitutes traditional simple current mirror using Wilson's electric current in current detection module, improves feedback electricity Flow IFBPrecision.
Embodiment three:
The structural block diagram of the present embodiment external compensation circuit is the same as example 1, and which is not described herein again, and Fig. 7 is this Shen Please embodiment three external compensation circuit physical circuit figure.It is to increase in current detection module with the different place of embodiment one Metal-oxide-semiconductor M is added4、M5, resistance R is eliminated in Current Voltage conversion moduleF, only device, switch control are compared with an amplifier AMP1 Molding block PMOS tube M31, NMOS pipe M32It forms cmos switch and reverser Inverter substitutes metal-oxide-semiconductor M3.Remove resistance RF The reason of be that resistance is difficult to realize in circuit integration, simplify circuit structure increase circuit level；Cmos switch and reverser Inverter substitutes metal-oxide-semiconductor M3The reason of be using CMOS complementarity reduce M3Grid leak, gate-source parasitic capacitance are to the shadow of driving signal It rings；Increase M4、M5The reason of pipe with implement two in it is just the same, which is not described herein again.M4Grid be connected to M5Grid and leakage Pole and M2Source electrode, M4Drain electrode be connected to M1Source electrode, M4Source electrode be connected to ground；M5Grid and drain electrode be connected to M2 Source electrode and M4Grid, M5Source electrode be connected to ground；The negative phase end of amplifier AMP1 is connected to reference voltage VREF, positive terminal company It is connected to current source IDATASecond end and M2Drain electrode, output end connect M32Grid and phase inverter Inverter input terminal； The input terminal of phase inverter Inverter is connected to M32Grid and amplifier AMP1 output end, the output of phase inverter Inverter End connection M31Grid； M31Grid be connected to the output end of phase inverter Inverter, M31Drain electrode is connected to switch transistor T2's Drain terminal and M31Source electrode, M31Source is connected to drive voltage signal source VDRIVERWith NMOS tube M32Drain electrode；M32Grid connection To the output end of amplifier AMP1 and the input terminal of phase inverter Inverter, M32Drain electrode is connected to drive voltage signal source VDRIVERWith M31Source electrode, M32Source electrode is connected to switch T2Drain electrode and M31Drain electrode.
The driving process of the present embodiment external compensation circuit is identical with embodiment one to be divided into programming phases and luminous rank Section drives tube current I in programming phasesDIt is detected in A point and IDATAIt is poor to make, and difference current is converted to voltage by comparator It controls signal and controls M32Pipe opening state, voltage signal carry out reverse phase by reverser and control M31The opening state of pipe, M31And M32 The cmos switch of composition reduces parasitic disturbances, makes VDRIVERT is adjusted to driving tube gate chargesDDucting capacity.Light emitting phase, outside Portion's driving circuit and pixel circuit separate, and the course of work is the same as example 1, and it is no longer repeated.
Beneficial effect
First, the external compensation circuit of the present embodiment is to compensate driving tube threshold voltage and migration based on current programmed The degeneration of rate and compensation precision is high；Second, this implementation eliminates R in Current Voltage conversion moduleF, simplify structure, convenient for electricity Road is integrated；Third substitutes the MOS switch in original circuit with cmos switch, reduces source and drain, grid source in switch control module Influence of the parasitic capacitance to driving voltage.Third substitutes traditional simple electricity using Wilson's electric current in current detection module Mirror is flowed, feedback current I is improvedFBPrecision.
Example IV:
The structural block diagram of the present embodiment external compensation circuit is the same as example 1, and which is not described herein again, and Fig. 8 is this Shen Please example IV external compensation circuit physical circuit figure.It is Current Voltage conversion module with the different place of embodiment one In eliminate resistance RF, device only is compared with an amplifier AMP1, the switch transistor T in pixel circuit1、T2, driving tube TDIt is replaced At p-type TFT, capacitor CSConnection it is different.Remove resistance R in Current Voltage conversion moduleFThe reason of be simplified point structure, not On the basis of influencing circuit operation principle, it is convenient for circuit integration；Switch transistor T in original pixel circuit1、T2, driving tube TDIt is replaced It is intended to illustrate that compensation circuit of the invention is not only applicable in N-type TFT pixel circuit at p-type TFT, to p-type TFT pixel circuit Correctly, external compensation circuit of the invention is applied widely.Switch T1Grid be connected to T2The grid and switch control of pipe are believed Number line VSCAN, T1Drain electrode be connected to the positive terminal and M of amplifier AMP21Drain electrode, T1Source electrode is connected to driving tube TDDrain electrode and The first end of luminous tube OLED；Switch T2Grid be connected to T1The grid and switch control signal line V of pipeSCAN, T2Drain electrode It is connected to driving tube TDGrid and storage capacitance CSFirst end, T2Source electrode is connected to M3Source electrode；Driving tube TDGrid connect It is connected to T2Drain electrode and storage capacitance CSFirst end, TDSource electrode be connected to storage capacitance CSSecond end and power supply VDD, TD's Drain electrode is connected to T1Source electrode and luminous tube OLED first end；Storage capacitance CSFirst end be connected to TDGrid and T2Pipe Drain electrode, storage capacitance CSSecond end be connected to TDSource electrode and power supply VDD；The connection type of other devices is basically unchanged, this In repeat no more.
The course of work of the present embodiment circuit is also classified into programming and shines two stages, only in programming phases, row scanning Switch control signal line VSCANLow level is exported, by first switch tube T1, second switch T2Responding to switch control signal is beaten respectively It opens；Driving current IDPass through p-type TFT pipe T1It charges to B point, node B voltage is made to be greater than VREFCurrent mirror is opened, the feedback electricity of detection Stream is in node A and IDATAIt is poor to make, and difference current is converted to voltage signal by comparator, controls M3Pipe closed state, makes VDRIVER It charges to G and adjusts TDDucting capacity；Light emitting phase, row scanning switch control signal wire VSCANOutput high level, described first Switch transistor T1, second switch T2It closes, external drive circuit and pixel circuit disconnect, capacitor CSStore corresponding driving voltage Driving tube is maintained to provide stable glow current.
Beneficial effect
The present embodiment, which demonstrates external compensation circuit of the invention not only, can compensate driving tube in N-type TFT pixel circuit The degeneration of threshold voltage and mobility can also compensate for p-type TFT pixel circuit, compared to traditional external compensation circuit, this hair The bright external compensation circuit scope of application is more extensive.
Embodiment five:
The structural block diagram of the present embodiment external compensation circuit is the same as example 1, and which is not described herein again, and Fig. 9 is this Shen Please embodiment five external compensation circuit physical circuit figure.It is Current Voltage conversion module with the different place of embodiment one In eliminate resistance RF, device only is compared with an amplifier AMP1, an amplifier and one have only been used in current detection module Metal-oxide-semiconductor reduces a metal-oxide-semiconductor.Remove resistance R in Current Voltage conversion moduleFThe reason of be simplified point structure, do not influencing On the basis of circuit operation principle, it is convenient for circuit integration；Second generation electric current is substituted using current follower in current detection module Transmitter can reduce current mismatch error caused by current mirror, improve current detecting while improving current feedback speed Precision.
The positive terminal of amplifier AMP2 is connected to metal-oxide-semiconductor M1Drain electrode and switch transistor T1Source electrode, negative phase end be connected to reference to electricity Press VREF, output end is connected to metal-oxide-semiconductor M1Grid；M1Grid be connected to the output end of AMP2, M1Drain electrode be connected to AMP2 Positive terminal and T1Source electrode, M1Source electrode be connected to programmable current source IDATASecond end and amplifier AMP1 positive terminal, even Connecing node is A point. M2Grid be connected to the output end of AMP1, M2Drain electrode be connected to voltage signal source VDRIVER, M2Source electrode connects It is connected to T2Pipe source electrode.The connection type of other devices is basically unchanged compared with embodiment one, and which is not described herein again.
The course of work of the present embodiment circuit is also classified into programming and shines two stages, and only in programming phases, outside is driven After dynamic circuit is connected with pixel circuit, due to meeting pre-stored reference voltage V on the empty short empty disconnected feedback line of amplifier AMP2REF, in driving tube Electric current IDRun through T1It directly charges to node B, B point voltage increases, when B point voltage is greater than VREFWhen, AMP1 exports high level By M1It opens, IDPass through M1In node A and data current IDATAIt is poor to make.AMP2 and M1The current follower of composition makes IDIt will not be to anti- Parasitic capacitance charging on feeder line but feedback rapidly, and B point charge accumulated is to VBGreater than VREFWhen M1It opens, is also beneficial to feed back The rapid detection of electric current.Difference current is converted into voltage signal by comparator AMP1, controls M2The opening time of pipe makes VDRIVER Signal, which charges to node G, adjusts the ducting capacity of driving tube, realizes compensation function.The course of work and embodiment one of light emitting phase Identical, which is not described herein again.
Figure 10 illustrates external compensation circuit timing diagram when sinusoidal signal driving, with one external compensation circuit sequence of embodiment Figure is compared, the difference is that drive voltage signal source VDRIVERBecome sinusoidal signal from ramp signal, sinusoidal signal is in unit The variable quantity of signal amplitude is greater than the variable quantity of ramp signal signal amplitude within the unit time in time, drives outside with it The speed of establishing of compensation circuit, electric current can faster, driving tube current I when two kinds of driving signals respectively driveDEstablish pair of speed Than seeing Figure 11, it is apparent that I when sinusoidal signal drivesDTo establish speed fast.In addition, sinusoidal signal will not sudden change Electric current I in driving tubeD, can reduce IDOvershoot amplitude improves the stability of driving circuit, and sinusoidal signal is in engineering practice It is easier to obtain.The timing of other control signals is identical as in embodiment one, and which is not described herein again.
Beneficial effect
First, this implementation eliminates R in Current Voltage conversion moduleF, simplify structure, be convenient for circuit integration；Second, this Embodiment is in current detection module, with an amplifier and a metal-oxide-semiconductor composition current follower substitution second generation electric current transmission Device can reduce current mismatch error caused by current mirror, improve the detection accuracy of feedback current, while relative to embodiment one The simple lower power consumption of circuit structure.Third, since the variable quantity of sinusoidal signal signal amplitude within the unit time is believed greater than slope The variable quantity of signal amplitude number within the unit time, substitutes ramp signal using sinusoidal signal to drive external compensation circuit, electricity The speed of establishing of stream can be faster.
Embodiment six:
Figure 12 is please referred to, a kind of drive system of active illuminant display is present embodiments provided.The active hair Light type display driving system includes: panel 41, gate driving circuit 51, clock controller 61, power circuit 71, source drive electricity Road 81, ramp signal generating circuit 91, sine wave signal generation circuit 100, row control signal wire SCAN, data-driven line Data Line, feedback driving line Feedback Line.Wherein panel include be arranged in N row M column picture element matrix and with it is more A pixel dot circuit connected a plurality of horizontal scanning line in the horizontal direction and a plurality of data-driven line and feedback vertically Driving；Pixel unit in panel pixel array passes through row control signal wire and is connected with gate driving circuit 51, above-mentioned pixel Pixel unit in matrix passes through data-driven line and feedback driving line is connected with source electrode drive circuit 81, by power supply line and Power circuit 71 is also connected.
Gate driving circuit 51 generates row scan control signal in the horizontal direction, and passes through different row control signals The corresponding pixel unit of line traffic control realizes progressive scan.The gate driving circuit passes through control line and 61 phase of clock control circuit Even, it is connected by power supply line with power circuit 71.
Clock control circuit 61, for generate in entire drive system the clock signal in need used.And pass through control Line processed is connected with gate driving circuit 51, source electrode drive circuit 81, is connected by power supply line with power circuit 71
Power circuit 71, for generate in drive system the supply voltage in need used.Pass through power supply line and display Panel 41, gate driving circuit 51, source electrode drive circuit 81, clock control circuit 61 are connected.
Source electrode drive circuit 81, for generating the data drive voltage signal with compensation function of corresponding different grayscale, And corresponding pixel passed to by the data-driven line of different lines, it shows different image informations and compensation panel is shown Inhomogeneities.The source electrode drive circuit is connected by control line with clock control circuit 61, and power supply line and power circuit 71 are crossed Be connected
Ramp signal generating circuit 91 provides drive voltage signal VDRIVER for generating ramp signal.Sine wave signal Generation circuit 100 provides drive voltage signal for generating sine wave signal substitution ramp signal.
Above, a specific embodiment of the invention is described with reference to the accompanying drawings.It is worth noting that, common in this field Technical staff, can also be to specific implementation of the invention it is understood that without departing from the spirit and scope of the present invention Mode makees various changes and replacement.These changes and replacement are all fallen within the scope of the invention as defined in the claims.

Claims (11)

1. a kind of active illuminant outside display compensation circuit, which is characterized in that including passing through data line and feedback line mutually The external drive circuit and pixel circuit of electrical connection, the external drive circuit include:
Data current generation module, for being converted into corresponding number by the data voltage that vision signal is converted to for what is received Current detection module and Current Voltage conversion module are passed to according to electric current, and by data current；
Current detection module, in programming phases in prestoring a reference voltage on feedback line, to accelerate pixel circuit to feed back Feedback current to external drive circuit establishes speed；
Current Voltage conversion module, for the difference between feedback current provided by data current and current detection module is electric Circulation is changed to voltage signal with control switch control module；
Reference voltage module, for providing a reference voltage to Current Voltage conversion module and current detection module；
Driving signal generation module, for generating the driving signal for being suitable for external compensation circuit；
Switch control module, when Current Voltage conversion module, which generates voltage signal, acts on the module, for controlling driving letter Number to the charging process of driving tube；
The pixel circuit includes:
Switching tube, for connecting pixel circuit and external drive circuit in programming phases, and in light emitting phase by the two It disconnects；
Storage capacitance forms driving voltage for storing corresponding driving signal voltage, and provides in light emitting phase to driving tube Driving voltage；
Driving tube generates driving current and promotees for receiving the driving voltage of storage capacitance storage, and under the action of power module Luminescent device is set to shine；
Luminous tube for receiving the driving current of driving tube offer, and generates different brightness according to the size of driving current.
2. a kind of active illuminant outside display compensation circuit as described in claim 1, which is characterized in that the outside In driving circuit, data current generation module includes current signal source, and the first end in current signal source connects power supply, and second end connects Connect the positive terminal and current detection module of the first amplifier in Current Voltage conversion module；Reference voltage module includes reference voltage Source, reference voltage source are connected with the negative phase end of the second amplifier in the first amplifier and current detection module；Driving signal generation module Including the voltage signal source for generating ramp signal and sinusoidal signal, third in voltage signal source one end and switch control module The drain electrode of metal-oxide-semiconductor connects, the output end of another termination peripheral circuit.
3. a kind of active illuminant outside display compensation circuit as claimed in claim 2, which is characterized in that the external drive In dynamic circuit, current detection module includes the second amplifier, the first metal-oxide-semiconductor and the second metal-oxide-semiconductor；The reverse side of second amplifier is connected to Reference voltage module, positive terminal are connected to the drain terminal of the first metal-oxide-semiconductor and the drain terminal of first switch tube, output end and the first metal-oxide-semiconductor It is connected with the grid of the second metal-oxide-semiconductor, drain electrode and the positive terminal of the second amplifier and the source electrode phase of first switch tube of the first metal-oxide-semiconductor Even, source electrode ground connection, grid are connected with the output end of the grid of the second metal-oxide-semiconductor and the second amplifier, the drain electrode of the second metal-oxide-semiconductor and electricity The second end for flowing signal source is connected, and source electrode ground connection, grid is connected with the output end of the first metal-oxide-semiconductor and the second amplifier；Electric current electricity Pressing conversion module includes the first amplifier and resistance, and the reverse side of the first amplifier is connected to the second of reference voltage module and resistance End, positive terminal is connected with the second end of the first end of resistance and current signal source, and output end is connected to switch control module the The grid of three metal-oxide-semiconductors, the first end of resistance are connected with the second end of the positive terminal of the first amplifier and current signal source, second end It is connected with the reverse side of the first amplifier and reference voltage module；Switch control module includes third metal-oxide-semiconductor, third metal-oxide-semiconductor Drain electrode connect with driving signal generation module, the drain electrode of source electrode and first switch tube connection, grid is by the first amplifier output end Control.
4. a kind of active illuminant outside display compensation circuit as claimed in claim 2, which is characterized in that the external drive In dynamic circuit, current detection module includes the second amplifier, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor；The The reverse side of two amplifiers is connected to reference voltage module, and positive terminal is connected to the drain terminal of the first metal-oxide-semiconductor and the leakage of first switch tube End, output end is connected with the grid of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, the first metal-oxide-semiconductor drain and the positive terminal of the second amplifier with And the source electrode of first switch tube is connected, source electrode is connected with the drain electrode of the 4th metal-oxide-semiconductor, the grid of grid and the second metal-oxide-semiconductor and the The output end of two amplifiers is connected, and the drain electrode of the second metal-oxide-semiconductor is connected with the second end in current signal source, and source electrode is connected to the 5th MOS The grid of the drain gate of pipe and the 4th metal-oxide-semiconductor, grid are connected with the output end of the first metal-oxide-semiconductor and the second amplifier, and the 4th The grid of metal-oxide-semiconductor is connected to the grid and the source electrode of drain electrode and the second metal-oxide-semiconductor of the 5th metal-oxide-semiconductor, the drain electrode connection of the 4th metal-oxide-semiconductor Source electrode to the source electrode of the first metal-oxide-semiconductor, the 4th metal-oxide-semiconductor is connected to ground；The grid of 5th metal-oxide-semiconductor and drain electrode are connected to the 2nd MOS The source electrode of the grid of the source electrode of pipe and the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor is connected to ground；Current Voltage conversion module includes first Amplifier, first resistor and second resistance, the reverse side of the first amplifier are connected to the second end of reference voltage module and first resistor, Positive terminal is connected with the second end of the first end of first resistor and current signal source, and output end is connected to switch control module The grid of three metal-oxide-semiconductors, the first end of first resistor are connected with the second end of the positive terminal of the first amplifier and current signal source, the Two ends are connected with the reverse side of the first amplifier and reference voltage module, and the first end of second resistance is connected to the first amplifier The grid of output end and third metal-oxide-semiconductor, the second end of second resistance are connected to the second end and first amplifier of first resistor Negative phase end and reference voltage module；Switch control module includes third metal-oxide-semiconductor, and the drain electrode of third metal-oxide-semiconductor and driving signal produce Raw module connection, the drain electrode connection of source electrode and first switch tube, control of the grid by the first amplifier output end.
5. a kind of active illuminant outside display compensation circuit as claimed in claim 2, which is characterized in that the external drive In dynamic circuit, current detection module includes the second amplifier, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor；The The reverse side of two amplifiers is connected to reference voltage module, and positive terminal is connected to the drain terminal of the first metal-oxide-semiconductor and the leakage of first switch tube End, output end is connected with the grid of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, the first metal-oxide-semiconductor drain and the positive terminal of the second amplifier with And the source electrode of first switch tube is connected, source electrode is connected with the drain electrode of the 4th metal-oxide-semiconductor, the grid of grid and the second metal-oxide-semiconductor and The output end of second amplifier is connected, and the drain electrode of the second metal-oxide-semiconductor is connected with the second end in current signal source, source electrode and the 5th metal-oxide-semiconductor Drain gate and the grid of the 4th metal-oxide-semiconductor be connected, grid is connected with the output end of the first metal-oxide-semiconductor and the second amplifier, The grid of 4th metal-oxide-semiconductor is connected to the grid and the source electrode of drain electrode and the second metal-oxide-semiconductor of the 5th metal-oxide-semiconductor, the drain electrode of the 4th metal-oxide-semiconductor It is connected to the source electrode of the first metal-oxide-semiconductor, the source electrode of the 4th metal-oxide-semiconductor is connected to ground；The grid of 5th metal-oxide-semiconductor and drain electrode are connected to second The source electrode of the grid of the source electrode of metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor is connected to ground；Current Voltage conversion module includes the One amplifier, the reverse side of the first amplifier are connected to reference voltage module, and positive terminal connects the second end in current signal source, output end It is connected to the grid of the 7th metal-oxide-semiconductor of switch control module and the input terminal of phase inverter；Switch control module include the 6th metal-oxide-semiconductor, 7th metal-oxide-semiconductor and phase inverter, the input terminal of phase inverter are connected to the grid of the 7th metal-oxide-semiconductor and the output end of the first amplifier, reverse phase The output end of device connects the grid of the 6th metal-oxide-semiconductor；The grid of 6th metal-oxide-semiconductor is connected to the output end of phase inverter, the leakage of the 6th metal-oxide-semiconductor Pole is connected to the drain terminal of second switch and the source electrode of the 6th metal-oxide-semiconductor, the 6th metal-oxide-semiconductor source be connected to drive voltage signal source and The drain electrode of 7th metal-oxide-semiconductor；The grid of 7th metal-oxide-semiconductor is connected to the output end of the first amplifier and the input terminal of phase inverter, the 7th MOS Pipe, which drains, is connected to the source electrode in drive voltage signal source and the 6th metal-oxide-semiconductor, and the 7th metal-oxide-semiconductor source electrode is connected to the leakage of second switch The drain electrode of pole and the 6th metal-oxide-semiconductor.
6. a kind of active illuminant outside display compensation circuit as claimed in claim 2, which is characterized in that the external drive In dynamic circuit, current detection module includes the second amplifier, the first metal-oxide-semiconductor and the second metal-oxide-semiconductor；The reverse side of second amplifier is connected to Reference voltage module, positive terminal are connected to the drain terminal of the first metal-oxide-semiconductor and the drain terminal of first switch tube, output end and the first metal-oxide-semiconductor It is connected with the grid of the second metal-oxide-semiconductor, drain electrode and the positive terminal of the second amplifier and the source electrode phase of first switch tube of the first metal-oxide-semiconductor Even, source electrode ground connection, grid are connected with the output end of the grid of the second metal-oxide-semiconductor and the second amplifier, the drain electrode of the second metal-oxide-semiconductor and electricity The second end for flowing signal source is connected, and source electrode ground connection, grid is connected with the output end of the first metal-oxide-semiconductor and the second amplifier；Electric current electricity Pressing conversion module includes the first amplifier, and the reverse side of the first amplifier is connected to reference voltage module, and positive terminal connects current signal The second end in source, output end are connected to the grid of switch control module third metal-oxide-semiconductor, and switch control module includes third metal-oxide-semiconductor, The drain electrode of third metal-oxide-semiconductor is connect with driving signal generation module, and the drain electrode connection of source electrode and first switch tube, grid is by the first fortune Put the control of output end.
7. a kind of active illuminant outside display compensation circuit as claimed in claim 2, which is characterized in that the external drive In dynamic circuit, current detection module includes the second amplifier and the first metal-oxide-semiconductor；The positive terminal of second amplifier is connected to the first metal-oxide-semiconductor Drain electrode and first switch tube source electrode, negative phase end is connected to reference voltage module, and output end is connected to the grid of the first metal-oxide-semiconductor Pole；The grid of first metal-oxide-semiconductor is connected to the output end of the second amplifier, and the drain electrode of the first metal-oxide-semiconductor is connected to the positive of the second amplifier The source electrode at end and first switch tube, the second end and the second amplifier that the source electrode of the first metal-oxide-semiconductor is connected to programmable current source are just Xiang Duan；Current Voltage conversion module includes the first amplifier, and the reverse side of the first amplifier is connected to reference voltage module, and positive terminal connects The second end in current signal source is connect, output end is connected to the grid of the second metal-oxide-semiconductor of switch control module, and switch control module includes The drain electrode of second metal-oxide-semiconductor, the second metal-oxide-semiconductor is connect with driving signal generation module, the drain electrode connection of source electrode and first switch tube, grid Control of the pole by the first amplifier output end.
8. a kind of active illuminant outside display compensation circuit as described in claim 3,4,5,7 is any, which is characterized in that institute In the pixel circuit stated, switching tube includes first switch tube and second switch, and first switch tube source is coupled to the first metal-oxide-semiconductor Drain terminal and the second amplifier positive terminal, the drain terminal of first switch tube be coupled to the source of driving tube, storage capacitance second end with And the first end of luminous tube, control terminal are coupled to row scan control signal line, the drain terminal of second switch is coupled to switch control The source of module third metal-oxide-semiconductor, the source of second switch are coupled to the grid of driving tube, and control terminal is coupled to row scan control Signal wire；Power module is coupled in the drain electrode of the driving tube, and grid is coupled to the source electrode and storage capacitance of second switch First end, source electrode is coupled to the drain electrode of first switch tube and the first end of luminous tube；The first end of the luminous tube connects To the source electrode of driving tube and the drain electrode of first switch tube, it is extreme that the second end of luminous tube is connected to common electrical；Storage capacitance first End is coupled to the grid of driving tube and the source electrode of second switch, and storage capacitance second end is coupled to the source electrode of driving tube and shines The drain electrode of the first end and first switch tube of pipe.
9. a kind of active illuminant outside display compensation circuit as claimed in claim 6, which is characterized in that it is characterized in that, In the pixel circuit, switching tube includes first switch tube and second switch, and first switch tube source is coupled to the first MOS The positive terminal of the drain terminal of pipe and the second amplifier, the drain terminal of first switch tube be coupled to driving tube source and luminous tube first End, control terminal are coupled to row scan control signal line, and the drain terminal of second switch is coupled to switch control module third metal-oxide-semiconductor Source, the source of second switch are coupled to the grid of driving tube, and control terminal is coupled to row scan control signal line；The drive The source electrode of dynamic pipe is coupled to power module and storage capacitance second end, and grid is coupled to the source electrode and storage capacitance of second switch First end, source electrode is coupled to the drain electrode of first switch tube and the first end of luminous tube；The first end of the luminous tube connects To the source electrode of driving tube and the drain electrode of first switch tube, it is extreme that the second end of luminous tube is connected to common electrical；Storage capacitance first End is coupled to the grid of driving tube and the drain electrode of second switch, and the storage capacitance second end is coupled to the source electrode of driving tube And power module.
10. a kind of active illuminant display drive system, which is characterized in that based on circuit described in claim 1-9, packet It includes:
Active illuminant display panel, display panel include the pixel of N × M OLED, μ LED or QLED, and are connected with pixel The N number of row control signal wire vertically connect and the M column data driving line in the horizontal direction being connect with pixel with And M column feedback driving line；
Gate driving circuit generates the row control signal moved in the vertical direction, and passes through different row control signal wire controls Make connecting or disconnecting for corresponding pixel unit and external drive circuit；
Source electrode drive circuit for generating the data drive voltage signal with compensation function of corresponding different grayscale, and passes through The data-driven line of different lines passes to corresponding pixel, shows different image informations and that compensation panel is shown is uneven Property.
Clock control circuit, for generate in entire drive system the clock signal in need used.
Slope signal generating circuit provides drive voltage signal for generating ramp signal.
Sine wave signal generation circuit provides drive voltage signal for generating sine wave signal substitution ramp signal.
Power circuit, for generate in drive system the supply voltage in need used.
11. a kind of driving signal optimization method of active illuminant outside display compensation circuit, which is characterized in that be based on right It is required that circuit described in 1-9, driving signal generation module generates different driving signal: ramp signal and sine wave drive letter Number, in which:
In programming phases, after the first, second switching tube connects external drive circuit with pixel circuit, ramp signal is as driving Signal adjusts electric current in driving tube and gradually approaches data current to the gate charges of driving tube, reduce in driving tube electric current due to Grid voltage changes the too fast situation for causing loop caused by overshoot unstable；
Driving signal generation module gate charges of the sine wave signal substitution ramp signal as driving signal to driving tube；
Quadratic function signal, exponential signal are generated as driving signal using driving signal generation module, accelerate driving tube current Establish the fluorescent lifetime that speed increases pixel in panel.
CN201910401362.4A 2019-05-15 2019-05-15 Active illuminant outside display compensation circuit, drive system and driving signal optimization method Pending CN110136638A (en)

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CN111477162A (en) * 2020-04-17 2020-07-31 京东方科技集团股份有限公司 Pixel circuit, driving method thereof and display device
CN114005410A (en) * 2020-07-28 2022-02-01 京东方科技集团股份有限公司 Display panel, driving method thereof and display device
CN114038389A (en) * 2021-05-24 2022-02-11 重庆康佳光电技术研究院有限公司 Driving circuit and method of light-emitting unit, display unit and display panel
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CN114677966A (en) * 2022-04-19 2022-06-28 中南大学 Micro-LED display device and feedback compensation circuit thereof
CN114743518A (en) * 2022-05-13 2022-07-12 南开大学 Two-way symmetrical slope type analog pixel driving circuit and driving method thereof
CN116543691A (en) * 2023-05-19 2023-08-04 华南理工大学 Gate driving circuit, active electroluminescent display and driving method
CN116543691B (en) * 2023-05-19 2024-04-02 华南理工大学 Gate driving circuit, active electroluminescent display and driving method
CN116543704A (en) * 2023-07-07 2023-08-04 惠科股份有限公司 Compensation circuit, compensation method and display panel
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CN117238243A (en) * 2023-11-15 2023-12-15 中科(深圳)无线半导体有限公司 Micro LED current type driving circuit for improving afterimage phenomenon and implementation method thereof
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