CN113112962B - Display driving circuit and driving method thereof - Google Patents

Display driving circuit and driving method thereof Download PDF

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Publication number
CN113112962B
CN113112962B CN202110401427.2A CN202110401427A CN113112962B CN 113112962 B CN113112962 B CN 113112962B CN 202110401427 A CN202110401427 A CN 202110401427A CN 113112962 B CN113112962 B CN 113112962B
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thin film
film transistor
module
driving
display
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CN113112962A (en
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王利民
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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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]
    • 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
    • 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
    • G09G3/3258—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 with pixel circuitry controlling the voltage across the light-emitting element
    • 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

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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)

Abstract

The invention provides a display driving circuit and a driving method of the display driving circuit, wherein a source electrode driving module of the display driving circuit inputs a first data signal to a first input end of a selection module, inputs a control signal to a control end of the selection module, and a reverse bias circuit inputs a second data signal to a second input end of the selection module; the selection module outputs a first data signal to the display module in the display time of the display frame period, the display module normally emits light, the selection module outputs a second data signal to the display module in the non-display time of the display frame period, in the non-display frame period or in the shutdown state, the pixel circuit of the display module is in a reverse bias state, the driving transistor is quenched and tempered, the electronic state is restored, the aging of the driving transistor is delayed, the compensation of the threshold voltage Vth characteristic of the driving transistor is realized, the difference of current among the driving transistors is further reduced, and the display uniformity of the display module is improved.

Description

Display driving circuit and driving method thereof
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display driving circuit and a driving method of the display driving circuit.
Background
The conventional AMOLED (Active Matrix Organic Light Emitting Diode ) display panel has been widely used because it is lighter and thinner than the liquid crystal display panel. The self-luminous display can cause problems of service life attenuation, residual shadow and the like due to the characteristic drift of the thin film transistor, so that various different compensation schemes are developed in the industry, and the self-luminous display is mainly classified into an internal compensation mode by utilizing a pixel structure or an external compensation mode by matching a driving chip, wherein the external compensation mode is a research hot spot of the large-size self-luminous display due to good compensation effect, high aperture opening ratio and the like. The existing external compensation scheme is based on a 3T1C pixel architecture, has the functions of display, detection and compensation, and compensates a display picture by detecting the threshold Vth and k value characteristics of a driving transistor and generating compensation data, wherein the detection is used as a core process of an algorithm, and a driving IC is required to provide a core module such as an ADC (analog to digital converter) to complete the detection process.
As shown in fig. 1, the current large-size flexible display panel generally adopts a 3T1C pixel circuit architecture, and in one display frame period, first, the scanning line WR and the sensing line Vini input high voltage, the switching transistor T12 and the detecting transistor T13 are turned on, and the gate voltage Vg of the driving transistor T11 is written into the data voltage V Date The drain voltage Vs of the driving transistor T11 is written into the reference voltage Vini, then the scanning line WR and the sensing line switch back to low voltage, based on the storage capacitor Cst, the driving transistor T11 is kept on, the light emitting device LED emits light until the voltage difference Vgs provided by the capacitor Cst drops to 0, in a display frame period, the current flow directions of the driving transistor T11 and the light emitting device LED are always from the positive electrode Vs to the negative electrode, the driving transistor T11 and the light emitting device are aged, the threshold value of the driving transistor T11 and the conduction voltage of the light emitting device are changed, and the uniformity of pixel display is affected.
In order to solve the above-mentioned problems, the conventional external compensation scheme is to detect the threshold voltage of each driving transistor T11, and compensate the data voltage Vdate and the reference voltage Vini by an external compensation method, thereby improving the display effect. The threshold voltage of the driving transistor T11 is obtained by detecting the voltage Vg of the gate electrode and the voltage Vs of the drain electrode of the driving transistor T11; threshold voltage vth=vg-Vs; in this case, it should be understood that the upper limit value of the actually detected threshold voltage Vth does not exceed the magnitude of the driving voltage Vg, but the driving transistor T11 is continuously aged during normal operation, the Vth drift range of the driving transistor T11 is large, and if the upper limit value of the threshold voltage Vth exceeds the magnitude of the driving voltage Vg, the ADC module cannot detect the corresponding threshold voltage Vth, and cannot compensate the corresponding pixel circuit.
In summary, a new display driving circuit and a driving method of the display driving circuit are needed to solve the problems that the aging of the driving transistor cannot be delayed by the existing external compensation scheme, the detection range of the ADC module for the threshold voltage is limited, and when the actual threshold voltage of a part of the driving transistors is greater than the driving voltage, the existing threshold voltage detection method cannot accurately detect the threshold voltage variation of the pixel circuit, so that the source driving module cannot perform effective data voltage compensation, resulting in poor compensation effect of the data voltage and affecting the display uniformity of the display device.
Disclosure of Invention
The invention provides a display driving circuit and a driving method of the display driving circuit, which can solve the problems that the aging of a driving transistor cannot be delayed by the existing external compensation scheme, the detection range of an ADC module for threshold voltage is limited, and when the actual threshold voltage of part of driving transistors is larger than the driving voltage, the existing threshold voltage detection method cannot accurately detect the change of the threshold voltage of a pixel circuit, so that the source driving module cannot perform effective data voltage compensation, the compensation effect of the data voltage is poor, and the display uniformity of a display device is affected.
The technical scheme provided by the invention is as follows:
the embodiment of the invention provides a display driving circuit, which comprises a display module, a source electrode driving module, a reverse bias circuit and a plurality of selection modules, wherein the selection modules are used for connecting the display module and the source electrode driving module; the selection module comprises a first input end, a second input end, a control end and an output end.
The source electrode driving module inputs a first data signal to a first input end of the selecting module and inputs a control signal to a control end of the selecting module; the reverse bias circuit inputs a second data signal to a second input end of the selection module; the selection module outputs the first data signal or the second data signal to the display module under the control of the control signal.
According to a preferred embodiment of the present invention, the display driving circuit further includes a TCON module, and the source driving module further includes an ADC module, where the ADC module is configured to obtain a threshold value of a driving thin film transistor of the display module, update an existing compensation data voltage after generating the compensation data voltage according to the threshold value of the driving thin film transistor, and feed back the threshold value of the driving thin film transistor to the TCON module.
And the TCON module generates a display data signal and the control signal according to the threshold change of the driving thin film transistor, and sends the display data signal and the control signal to the source electrode driving module.
According to a preferred embodiment of the present invention, the first data signal is a superimposed electrical signal of the display data signal and the compensation data voltage.
According to a preferred embodiment of the present invention, the TCON module generates the second data signal according to a threshold variation of the driving thin film transistor, and sends the second data signal to the reverse bias circuit, where the first data signal is a positive voltage and the second data signal is a negative voltage.
According to a preferred embodiment of the present invention, the second input terminals of all the selection modules are electrically connected to the same one of the reverse bias circuits through the same signal line.
According to a preferred embodiment of the present invention, each of the selection modules includes a first thin film transistor and a second thin film transistor, and a source electrode of the first thin film transistor and a source electrode of the second thin film transistor are electrically connected to a first input terminal and a second input terminal of the selection module, respectively.
The grid electrode of the first thin film transistor is connected with the grid electrode of the second thin film transistor in series, and the grid electrodes of the first thin film transistor and the second thin film transistor are electrically connected with the control end of the selection module.
The drain electrode of the first thin film transistor and the drain electrode of the second thin film transistor are connected in series, and the drain electrode of the first thin film transistor and the drain electrode of the second thin film transistor are electrically connected with the output end of the selection module.
According to a preferred embodiment of the present invention, the first thin film transistor is a P-type thin film transistor, and the second thin film transistor is an N-type thin film transistor.
According to a preferred embodiment of the present invention, the display module includes pixel circuits distributed in an array, and the pixel circuits include a switching thin film transistor, the driving thin film transistor, a detecting thin film transistor, a storage capacitor Cst, and a light emitting device.
The grid electrode of the switching thin film transistor is electrically connected with the first scanning line, the source electrode of the switching thin film transistor is electrically connected with the output end of the selection module, and the drain electrode of the switching thin film transistor is electrically connected with the first node; the grid electrode of the driving thin film transistor is electrically connected with the first node, the source electrode of the driving thin film transistor is electrically connected with a positive power supply voltage, the drain electrode of the driving thin film transistor, one end of the light emitting device and the source electrode of the detecting thin film transistor are electrically connected with the second node, and the other end of the light emitting device is electrically connected with a negative power supply voltage; the grid electrode of the detection thin film transistor is electrically connected with the second scanning line, and the drain electrode of the detection thin film transistor is electrically connected with the sensing module through the sensing signal line; a storage capacitor Cst is arranged between the first node and the second node.
According to a preferred embodiment of the present invention, the control signal is either a low potential 0 or a high potential 1.
When the control signal is at a low potential 0, the first thin film transistor is turned on, the second thin film transistor is turned off, the output end of the selection module outputs the first data signal to the source electrode of the switching thin film transistor, the voltage of the first node is a forward voltage signal, and the difference between the voltage of the first node and the voltage of the second node is larger than the threshold voltage of the driving thin film transistor.
When the control signal is at a high potential 1, the first thin film transistor is turned off, the second thin film transistor is turned on, the output end of the selection module outputs the second data signal to the source electrode of the switching thin film transistor, the voltage of the first node is a negative voltage, the voltage of the second node is a positive voltage, and the difference between the voltage of the second node and the voltage of the first node is larger than the threshold voltage of the driving thin film transistor.
According to the display driving circuit, the present invention further provides a driving method of the display driving circuit according to the above embodiment, including:
step S10, an ADC module obtains a threshold value change of a driving thin film transistor of a pixel circuit of a display module, generates a compensation data signal, and feeds back the threshold value of the driving thin film transistor to a TCON module, wherein the TCON module generates a corresponding display data signal, a second data signal and a control signal according to the threshold value change of the driving thin film transistor, sends the display data signal and the control signal to a source electrode driving module, and sends the second data signal to a reverse bias circuit, and the first data signal is a superposition electric signal of the display data signal and the compensation data voltage.
In step S20, the source driving module respectively inputs the first data signal and the control signal to the first input terminal and the control terminal of the selection module, and the reverse bias circuit inputs the second data signal to the second input terminal of the selection module.
Step S30, when the control signal is a low voltage signal 0, the selection module inputs the first data signal to the source electrode of the switching thin film transistor of the pixel circuit, and the pixel circuit is normally driven; when the control signal is a high voltage signal 1, the selection module inputs the second data signal to the source electrode of the switching thin film transistor of the pixel circuit, and the pixel circuit is reversely biased.
The invention has the beneficial effects that: the embodiment of the invention provides a display driving circuit and a driving method of the display driving circuit, wherein the display driving circuit comprises a display module, a source electrode driving module, a reverse bias circuit and a plurality of selection modules used for connecting the display module and the source electrode driving module; the selection module comprises a first input end, a second input end, a control end and an output end; the source electrode driving module inputs a first data signal to a first input end of the selecting module and inputs a control signal to a control end of the selecting module; the reverse bias circuit inputs a second data signal to a second input end of the selection module; in the display time of the display frame period, under the control of the low voltage signal of the control signal, the selection module outputs the first data signal to the display module, the display module normally emits light, in the non-display time of the display frame period, in the non-display frame period or in the shutdown state, under the control of the high voltage signal of the control signal, the selection module outputs the second data signal to the display module, the pixel circuit of the display module is in a reverse bias state, the driving transistor is quenched and tempered, the electronic state is recovered, the aging of the driving transistor is delayed, the compensation of the threshold voltage Vth characteristic of the driving transistor is realized, the difference of currents among the driving transistors is further reduced, and the display uniformity of the display module is improved.
Drawings
In order to more clearly illustrate the embodiments or the technical solutions in the prior art, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a 3T1C pixel circuit in the prior art.
Fig. 2 is a schematic diagram showing threshold values of driving tfts in a pixel circuit according to the prior art.
Fig. 3 is a schematic diagram of a partial circuit connection of a display driving circuit according to the present invention.
Fig. 4 is a schematic circuit connection diagram of another portion of the display driving circuit according to the present invention.
Fig. 5 is a schematic circuit connection diagram of a selection module of a display driving circuit according to the present invention.
Fig. 6 is a schematic diagram of a pixel circuit for providing an input first data signal/second data signal according to the present invention.
Fig. 7 is a schematic diagram of data switching in a packet between two adjacent frames according to the present invention.
Fig. 8 is a schematic diagram showing threshold values of driving tfts in a pixel circuit according to the present invention.
Fig. 9 is a schematic flow chart of a driving method of a display driving circuit according to the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], etc., are only referring to the directions of the attached drawings. Accordingly, directional terminology is used to describe and understand the invention and is not limiting of the invention. In the drawings, like elements are denoted by the same reference numerals, and broken lines in the drawings indicate that they are not present in the structure, and only the shape and position of the structure are described.
In practice, however, due to factors such as manufacturing process and conditions, there is a certain difference in electrical characteristics (including the threshold voltage Vth and the K value) of the driving transistor in the display device, so that the driving transistor in each pixel has different currents flowing through the OLED even under the same driving voltage, and thus the light emitting brightness of the light emitting device in each sub-pixel is different. As shown in fig. 2, the present invention is directed to the problem that the existing external compensation scheme cannot delay the aging of the driving transistor, the threshold value of the driving transistor changes with the extension of the working time, the source IC needs to detect the threshold voltage in real time and compensate, the detection range of the source IC to the threshold voltage is limited, and when the actual threshold voltage of a part of the driving transistors is greater than the detection range of the source IC, the existing threshold voltage detection method cannot accurately detect the threshold voltage change of the pixel circuit, so that the source driving module cannot perform effective data voltage compensation, resulting in poor compensation effect of the data voltage and affecting the display uniformity of the display device.
The embodiment of the invention provides a display driving circuit, which comprises a display module, a source electrode driving module, a reverse bias circuit and a plurality of selection modules used for connecting the display module and the source electrode driving module; the selection module comprises a first input end, a second input end, a control end and an output end; the source electrode driving module inputs a first data signal to a first input end of the selecting module and inputs a control signal to a control end of the selecting module; the reverse bias circuit inputs a second data signal to a second input end of the selection module; in the display time of the display frame period, under the control of the low voltage signal of the control signal, the selection module outputs the first data signal to the display module, the display module normally emits light, in the non-display time of the display frame period, in the non-display frame period or in the shutdown state, under the control of the high voltage signal of the control signal, the selection module outputs the second data signal to the display module, the pixel circuit of the display module is in a reverse bias state, the driving transistor is quenched and tempered, the electronic state is recovered, the aging of the driving transistor is delayed, the compensation of the threshold voltage Vth characteristic of the driving transistor is realized, the difference of currents among the driving transistors is further reduced, and the display uniformity of the display module is improved.
Specifically, as shown in fig. 3 and 4, the display driving circuit includes a TCON module 101, a source driving module 102, a gate driving module 103, a reverse bias circuit 105, a display module 104, and a plurality of selection modules 106 for connecting the display module 104 and the source driving module 102. The display module 104 includes scan lines and data lines disposed in a crossing manner, the scan lines and the data lines define positions of pixels P, pixel circuits are disposed in the pixels P, the scan lines are electrically connected to the gate driving module 103, and the data lines are electrically connected to the source driving module 102.
The source driving module 102 further includes an ADC module 1021, where the ADC module 1021 is configured to obtain a threshold value of a driving thin film transistor of the display module 104, update an existing compensation data voltage after generating the compensation data voltage according to the threshold value of the driving thin film transistor, and feed back the threshold value of the driving thin film transistor to the TCON module; the TCON module 101 generates a corresponding display data signal and a control signal according to a threshold variation of the driving thin film transistor, and sends the display data signal and the control signal to the source driving module 102, and the source driving module 102 superimposes the display data signal and the compensation data voltage by corresponding operations to generate a first data signal Dn, that is, the first data signal Dn is a superimposed electrical signal of the display data signal and the compensation data voltage. The TCON module 101 generates a corresponding second data signal Vstress according to the threshold variation of the driving thin film transistor, and sends the second data signal Vstress to the reverse bias circuit 105, where the second input ends of all the selection modules 106 are electrically connected to the same reverse bias circuit through the same signal line. The first data signal Dn is a positive voltage, and the second data signal Vstress is a negative voltage.
As shown in fig. 5, the source driving module 102 inputs the first data signal Dn (D1, D2, D3 to Dn) to the first input terminal 1062 of the selection module 106, and inputs the control signal Mn (M1, M2, M3 to Mn) to the control terminal 1061 of the selection module 106; the reverse bias circuit 105 inputs the second data signal Vstress to the second input 1063 of the selection module 106. The selection module 106 outputs the first data signal Dn or the second data signal Vstress to the display module 104 under the control of the control signal Mn. The second input terminals 1063 of all the selection modules 106 are preferably electrically connected to the same reverse bias circuit 105 through the same signal line, and the second data signal Vstress is a reverse Stress voltage signal, which can change the threshold voltage of the thin film transistor (shift the threshold voltage toward the Vth negative direction), so as to compensate the Vth forward shift problem caused by the forward bias of the driving thin film transistor during the normal first data voltage display.
Each selection module 106 includes a first thin film transistor T1 and a second thin film transistor T2, where a source of the first thin film transistor T1 and a source of the second thin film transistor T2 are electrically connected to a first input terminal 1062 and a second input terminal 1063 of the selection module 106, respectively; the gate of the first thin film transistor T1 and the gate of the second thin film transistor T2 are connected in series, and the gate of the first thin film transistor T1 and the gate of the second thin film transistor T2 are electrically connected to the control terminal 1061 of the selection module 106; the drain of the first thin film transistor T1 and the drain of the second thin film transistor T2 are connected in series, and the drain of the first thin film transistor T1 and the drain of the second thin film transistor T2 are electrically connected to the output terminal 1064 of the selection module 106. The first thin film transistor T1 is preferably a P-type thin film transistor, and the second thin film transistor T2 is preferably an N-type thin film transistor.
The control signal M1 is a low potential 0 or a high potential 1 which are set at intervals, when the control signal M1 is a low potential 0, the first thin film transistor T1 is turned on, the second thin film transistor T2 is turned off, and the output end 1064 of the selection module 106 outputs the first data signal D1; when the control signal M1 is at the high level 1, the first thin film transistor T1 is turned off, the second thin film transistor T2 is turned on, and the output terminal 1064 of the selection module 106 outputs the second data signal Vstress. The first data signal D1 is smaller than the second data signal vstres, the first data signal D1 is a positive dc voltage signal, and the second data signal vstres is a negative dc voltage signal.
The display module includes pixel circuits arranged in an array, as shown in fig. 6, the pixel circuits preferably adopt a 3T1C architecture, and the pixel circuits include a switching thin film transistor T3, a driving thin film transistor T4, a detecting thin film transistor T5, a storage capacitor Cst, and a light emitting device LED/OLED, wherein a gate of the switching thin film transistor T3 is electrically connected to the first scanning line WR, a source of the switching thin film transistor T3 is electrically connected to an output 1064 of the selection module 106, and a drain of the switching thin film transistor T3 is electrically connected to the first node g; the grid electrode of the driving thin film transistor T4 is electrically connected with the first node g, the source electrode of the driving thin film transistor T4 is electrically connected with the power source positive voltage EVDD, the drain electrode of the driving thin film transistor T4 is electrically connected with the second node s and one end of the light emitting device LED/OLED, and the other end of the light emitting device LED/OLED is electrically connected with the power source negative voltage EVDD; the grid electrode of the detection thin film transistor T5 is electrically connected with the second scanning line RD, the source electrode of the detection thin film transistor T5 is electrically connected with the second node s, and the drain electrode of the detection thin film transistor T5 is electrically connected with the ADC module 1021 through the induction signal line; a storage capacitor Cst is provided between the first node g and the second node s.
The ADC module is configured to obtain a threshold variation of the driving tft T4, generate a compensation data signal, and feed back the compensation data signal to the TCON module 101. The TCON module 101 generates a display data signal Dn, a control signal Mn and a second data signal Vstress according to the threshold value of the driving thin film transistor T4, where the display data signal Dn and the control signal Mn are input to the source driving module 102, and the first data signal Dn is a superimposed electrical signal of the display data signal and the compensation data voltage. The second data signal Vstress is input to the reverse bias circuit 105, and then the source driving module 102 inputs the first data signal Dn and the control signal Mn to the selection module 106, the reverse bias circuit 105 inputs the second data signal Vstress to the selection module 106, the output terminal of the selection module 106 outputs the first data signal Vdate (Dn), the voltage Vg of the first node g is greater than or equal to 0, and the pixel circuit operates normally. The output end of the selection module MUX outputs a second data signal VStress, the voltage Vg of the first node g is smaller than 0, the pixel circuit is reversely biased, the driving transistor is quenched and tempered, the state of electrons is recovered, the aging of the driving transistor is delayed, and the compensation of the threshold voltage Vth characteristic of the driving transistor is realized.
As shown in fig. 7, the present invention provides a schematic diagram of data switching in a packet between two adjacent frames. M1 of n-1 frame is low potential 0, sn-1 is first data signal Vdate, M1 of n frame is high potential 1, sn is second data signal V Stress . The first data signal Vdate is greater than the second data signal V Stress The first data signal Vdate is preferably a forward DC voltage signal, and the second data signal V Stress Preferably a negative direct voltage signal. According to the invention, a plurality of selection modules are arranged between the display module and the source electrode driving module, the output of forward data and reverse bias voltage can be switched through the selection modules, different reverse bias duty ratios (time) or amplitude control is carried out on the difference of forward bias conditions of different pixels Vth according to the detection result of the threshold voltage Vth of the driving thin film transistor, so that the driving thin film transistors with different forward bias are subjected to reverse bias of different time or amplitude, the accurate compensation of the threshold voltage Vth characteristic of the driving thin film transistor is realized, the difference of current between the driving thin film transistors is reduced, the display uniformity is improved, the influence on the display effect is avoided, and the execution of the reverse bias is controlled by a system at regular time and preferably under the shutdown condition.
As shown in fig. 8, in the case of the display driving circuit according to the present invention, the threshold voltage of the driving thin film transistor in the pixel circuit has small variation, so that the threshold voltage clock of the driving thin film transistor is ensured to be kept at a constant level and to be located within the detection range of the original IC.
According to the display driving circuit, as shown in fig. 9, the present invention further provides a driving method of the display driving circuit, which includes:
step S10, an ADC module obtains a threshold value change of a driving thin film transistor of a pixel circuit of a display module, generates a compensation data signal, and feeds back the threshold value of the driving thin film transistor to a TCON module, wherein the TCON module generates a corresponding display data signal, a second data signal and a control signal according to the threshold value change of the driving thin film transistor, sends the display data signal and the control signal to a source electrode driving module, and sends the second data signal to a reverse bias circuit, and the first data signal is a superposition electric signal of the display data signal and the compensation data voltage.
In step S20, the source driving module respectively inputs the first data signal and the control signal to the first input terminal and the control terminal of the selection module, and the reverse bias circuit inputs the second data signal to the second input terminal of the selection module.
Step S30, when the control signal is a low voltage signal 0, the selection module inputs the first data signal to the source electrode of the switching thin film transistor of the pixel circuit, and the pixel circuit is normally driven; when the control signal is a high voltage signal 1, the selection module inputs the second data signal to the source electrode of the switching thin film transistor of the pixel circuit, and the pixel circuit is reversely biased.
Preferably, the display module includes pixel circuits arranged in an array, and all the pixel circuits are driven normally and biased reversely in sequence or simultaneously in steps S10 to S30.
The time for reverse biasing the pixel circuit in step S30 is preferably in the non-display time of the display frame period, the non-display frame period, or the off state.
The embodiment of the invention provides a display driving circuit and a driving method of the display driving circuit, wherein the display driving circuit comprises a display module, a source electrode driving module, a reverse bias circuit and a plurality of selection modules used for connecting the display module and the source electrode driving module; the selection module comprises a first input end, a second input end, a control end and an output end; the source electrode driving module inputs a first data signal to a first input end of the selecting module and inputs a control signal to a control end of the selecting module; the reverse bias circuit inputs a second data signal to a second input end of the selection module; in the display time of the display frame period, under the control of the low voltage signal of the control signal, the selection module outputs the first data signal to the display module, the display module normally emits light, in the non-display time of the display frame period, in the non-display frame period or in the shutdown state, under the control of the high voltage signal of the control signal, the selection module outputs the second data signal to the display module, the pixel circuit of the display module is in a reverse bias state, the driving transistor is quenched and tempered, the electronic state is recovered, the aging of the driving transistor is delayed, the compensation of the threshold voltage Vth characteristic of the driving transistor is realized, the difference of currents among the driving transistors is further reduced, and the display uniformity of the display module is improved.
In summary, although the present invention has been described in terms of the preferred embodiments, the above-mentioned embodiments are not intended to limit the invention, and those skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention, so that the scope of the invention is defined by the appended claims.

Claims (9)

1. The display driving circuit is characterized by comprising a display module, a source electrode driving module, a reverse bias circuit and a plurality of selection modules used for connecting the display module and the source electrode driving module; the selection module comprises a first input end, a second input end, a control end and an output end;
the source electrode driving module inputs a first data signal to a first input end of the selecting module and inputs a control signal to a control end of the selecting module; the reverse bias circuit inputs a second data signal to a second input end of the selection module; the selection module outputs the first data signal or the second data signal to the display module under the control of the control signal;
the display driving circuit further comprises a TCON module, the source electrode driving module further comprises an ADC module, the ADC module is used for obtaining a threshold value of a driving thin film transistor of the display module, generating a compensation data voltage according to the threshold value of the driving thin film transistor, updating the existing compensation data voltage, and feeding back the threshold value of the driving thin film transistor to the TCON module;
and the TCON module generates a corresponding display data signal and the control signal according to the threshold change of the driving thin film transistor, and sends the display data signal and the control signal to the source electrode driving module.
2. The display driver circuit of claim 1, wherein the first data signal is a superimposed electrical signal of the display data signal and the compensation data voltage.
3. The display driving circuit according to claim 1, wherein the TCON module generates the second data signal according to a threshold variation of the driving thin film transistor and transmits the second data signal to the reverse bias circuit, the first data signal being a positive voltage and the second data signal being a negative voltage.
4. A display driving circuit according to claim 3, wherein the second input terminals of all the selection modules are electrically connected to the same one of the reverse bias circuits through the same signal line.
5. The display driver circuit of claim 1, wherein each of the selection modules comprises a first thin film transistor and a second thin film transistor, the sources of the first thin film transistor and the second thin film transistor being electrically connected to the first input terminal and the second input terminal of the selection module, respectively;
the grid electrode of the first thin film transistor and the grid electrode of the second thin film transistor are connected in series, and the grid electrode of the first thin film transistor and the grid electrode of the second thin film transistor are electrically connected with the control end of the selection module;
the drain electrode of the first thin film transistor and the drain electrode of the second thin film transistor are connected in series, and the drain electrode of the first thin film transistor and the drain electrode of the second thin film transistor are electrically connected with the output end of the selection module.
6. The display driver circuit according to claim 5, wherein the first thin film transistor is a P-type thin film transistor and the second thin film transistor is an N-type thin film transistor.
7. The display driver circuit according to claim 5, wherein the display module includes pixel circuits distributed in an array, the pixel circuits including a switching thin film transistor, the driving thin film transistor, a detecting thin film transistor, a storage capacitor Cst, and a light emitting device;
the grid electrode of the switching thin film transistor is electrically connected with the first scanning line, the source electrode of the switching thin film transistor is electrically connected with the output end of the selection module, and the drain electrode of the switching thin film transistor is electrically connected with the first node; the grid electrode of the driving thin film transistor is electrically connected with the first node, the source electrode of the driving thin film transistor is electrically connected with a positive power supply voltage, the drain electrode of the driving thin film transistor, one end of the light emitting device and the source electrode of the detecting thin film transistor are electrically connected with the second node, and the other end of the light emitting device is electrically connected with a negative power supply voltage; the grid electrode of the detection thin film transistor is electrically connected with the second scanning line, and the drain electrode of the detection thin film transistor is electrically connected with the ADC module through the induction signal line; a storage capacitor Cst is arranged between the first node and the second node.
8. The display driver circuit according to claim 7, wherein the control signal is a low potential 0 or a high potential 1;
when the control signal is at a low potential 0, the first thin film transistor is turned on, the second thin film transistor is turned off, the output end of the selection module outputs the first data signal to the source electrode of the switching thin film transistor, the voltage of the first node is a forward voltage signal, and the difference between the voltage of the first node and the voltage of the second node is larger than the threshold voltage of the driving thin film transistor;
when the control signal is at a high potential 1, the first thin film transistor is turned off, the second thin film transistor is turned on, the output end of the selection module outputs the second data signal to the source electrode of the switching thin film transistor, the voltage of the first node is a negative voltage, the voltage of the second node is a positive voltage, and the difference between the voltage of the second node and the voltage of the first node is larger than the threshold voltage of the driving thin film transistor.
9. A driving method using the display driving circuit according to any one of claims 1 to 8, comprising:
step S10, an ADC module obtains a threshold value change of a driving thin film transistor of a pixel circuit of a display module, generates a compensation data signal, and feeds back the threshold value of the driving thin film transistor to a TCON module, wherein the TCON module generates a corresponding display data signal, a second data signal and a control signal according to the threshold value change of the driving thin film transistor, sends the display data signal and the control signal to a source electrode driving module, and sends the second data signal to a reverse bias circuit, wherein the first data signal is a superposition electric signal of the display data signal and the compensation data voltage;
step S20, the source driving module respectively inputs the first data signal and the control signal to a first input terminal and a control terminal of the selection module, and the reverse bias circuit inputs the second data signal to a second input terminal of the selection module;
step S30, when the control signal is a low voltage signal 0, the selection module inputs the first data signal to the source electrode of the switching thin film transistor of the pixel circuit, and the pixel circuit is normally driven; when the control signal is a high voltage signal 1, the selection module inputs the second data signal to the source electrode of the switching thin film transistor of the pixel circuit, and the pixel circuit is reversely biased.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200710808A (en) * 2005-07-20 2007-03-16 Pioneer Corp Active matrix display apparatus and driving method therefor
CN102365675A (en) * 2009-04-03 2012-02-29 夏普株式会社 Liquid crystal display apparatus, drive circuit therefor, and drive method therefor
CN108877686A (en) * 2017-05-12 2018-11-23 京东方科技集团股份有限公司 Compensation data method and device, display driving method and device, display device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7173590B2 (en) * 2004-06-02 2007-02-06 Sony Corporation Pixel circuit, active matrix apparatus and display apparatus
JP4640449B2 (en) * 2008-06-02 2011-03-02 ソニー株式会社 Display device, driving method thereof, and electronic apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200710808A (en) * 2005-07-20 2007-03-16 Pioneer Corp Active matrix display apparatus and driving method therefor
CN102365675A (en) * 2009-04-03 2012-02-29 夏普株式会社 Liquid crystal display apparatus, drive circuit therefor, and drive method therefor
CN108877686A (en) * 2017-05-12 2018-11-23 京东方科技集团股份有限公司 Compensation data method and device, display driving method and device, display device

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