CN113112962A - Display drive circuit and drive method of display drive circuit - Google Patents

Display drive circuit and drive method of display drive circuit Download PDF

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Publication number
CN113112962A
CN113112962A CN202110401427.2A CN202110401427A CN113112962A CN 113112962 A CN113112962 A CN 113112962A CN 202110401427 A CN202110401427 A CN 202110401427A CN 113112962 A CN113112962 A CN 113112962A
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thin film
film transistor
module
display
driving
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CN113112962B (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 thereof.A source electrode driving module of the display driving circuit inputs a first data signal to a first input end of a selection module and 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 the first data signal to the display module within the display time of a display frame period, the display module normally emits light, the selection module outputs the second data signal to the display module within the non-display time of the display frame period, the non-display frame period or the shutdown state, a pixel circuit of the display module is in a reverse bias state, the driving transistors are tempered, the electronic state is recovered, the aging of the driving transistors is delayed, the compensation of the threshold voltage Vth characteristic of the driving transistors 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 drive circuit and drive method of display drive circuit
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
An existing AMOLED (Active Matrix Organic Light Emitting Diode) display panel is thinner and lighter than a liquid crystal display panel, and thus has a wide application. The self-luminous display has problems of life attenuation and image sticking caused by characteristic drift of the thin film transistor, and therefore, the industry is developing various different compensation schemes, which are mainly classified into two types of internal compensation realized by using a pixel structure or external compensation realized by matching with a driving chip, wherein the external compensation is a research hotspot of a large-size self-luminous display due to good compensation effect, high aperture ratio and the like. The existing external compensation scheme is mostly based on a 3T1C pixel architecture, and has functions of display, detection and compensation, and the display effect is improved by detecting the threshold Vth and k value characteristics of the driving transistor, generating compensation data, and compensating the display picture, wherein the detection is used as the core process of the algorithm, and the driving IC is required to provide core modules such as an ADC and the like to complete the detection process.
As shown in fig. 1, the current large-sized flexible display panel usually adopts a 3T1C pixel circuit architecture, and in a display frame period, firstly, the high voltage is inputted to the scan line WR and the sense line Vini, the switch transistor T12 and the detection transistor T13 are turned on, and the gate voltage Vg of the driving transistor T11 is written into the data voltage VDateThe drain voltage Vs of the driving transistor T11 is written into the reference voltage Vini, then the scanning line WR and the sensing line are switched 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 is reduced to 0, and in one display frame period, the current flow of the driving transistor T11 and the light emitting device LED is from the positive electrode Vs to the negative electrode, and the driving transistor T11 and the light emitting device both age, so that the threshold value of the driving transistor T11 and the on-state voltage of the light emitting device change, and the uniformity of pixel display is affected.
In view of the above technical problems, the conventional external compensation scheme detects the threshold voltage of each driving transistor T11, and compensates the data voltage Vdate and the reference voltage Vini by external compensation, thereby improving the display effect. The threshold voltage of the driving transistor T11 is obtained by detecting the gate voltage Vg and the drain voltage Vs of the driving transistor T11; the threshold voltage Vth is Vg-Vs; in this case, it should be understood that the actually detected upper limit of the threshold voltage Vth does not exceed the magnitude of the driving voltage Vg, but the driving transistor T11 will age continuously in normal operation, the Vth drift range of the driving transistor T11 is large, and if the upper limit 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 need to be provided 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 to 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 threshold voltage change of the pixel circuit cannot be accurately detected by the existing threshold voltage detection method, 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 the display device is affected, and improvements are needed.
Disclosure of Invention
The invention provides a display driving circuit and a driving method thereof, 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 (analog-to-digital converter) module on threshold voltage is limited, and when the actual threshold voltage of part of driving transistors is larger than the driving voltage, the threshold voltage change of a pixel circuit cannot be accurately detected by the existing threshold voltage detection method, 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 influenced.
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 selection module and inputs a control signal to a control end of the selection 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 of a driving thin film transistor of the display module, generate a compensation data voltage according to the threshold of the driving thin film transistor, update an existing compensation data voltage, and feed back the threshold 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 variation 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 reverse bias circuit 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 of the first thin film transistor and a source of the second thin film transistor are 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 is connected with the grid electrode of the second thin film transistor in series, and the grid electrode of the first thin film transistor and the grid electrode of the second thin film transistor are both electrically connected with the control end of the selection module.
The drain electrode of the first thin film transistor is connected with the drain electrode of the second thin film transistor in series, and the drain electrode of the first thin film transistor and the drain electrode of the second thin film transistor are both 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 switch thin film transistor is electrically connected with the first scanning line, the source electrode of the switch thin film transistor is electrically connected with the output end of the selection module, and the drain electrode of the switch 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 the positive voltage of the power supply, the drain electrode of the driving thin film transistor, one end of the light-emitting device and the source electrode of the detection thin film transistor are electrically connected with the second node, and the other end of the light-emitting device is electrically connected with the negative voltage of the power supply; 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 induction signal line; a storage capacitor Cst is disposed between the first node and the second node.
According to a preferred embodiment of the present invention, the control signal is low 0 or high 1.
When the control signal is at a low potential of 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 greater than the threshold voltage of the driving thin film transistor.
When the control signal is at a high potential of 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 greater 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, the ADC module obtains a threshold value change of a driving thin film transistor of a pixel circuit of the display module, generates a compensation data signal, and feeds back the threshold value of the driving thin film transistor to the TCON module, where 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 the source driver module, and sends the second data signal to the reverse bias circuit, where the first data signal is a superimposed electrical signal of the display data signal and the compensation data voltage.
In step S20, the source driver 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 a source of a switching thin film transistor of the pixel circuit, and the pixel circuit is driven normally; when the control signal is a high-voltage signal 1, the selection module inputs the second data signal to a source electrode of a switch 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 thereof, wherein the display driving circuit comprises a display module, a source electrode driving module, a reverse bias circuit and a plurality of selection modules 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 selection module and inputs a control signal to a control end of the selection module; the reverse bias circuit inputs a second data signal to a second input end of the selection module; in the display time of a display frame period, under the control of a low voltage signal of a control signal, a selection module outputs a first data signal to a display module, the display module normally emits light, in the non-display time of the display frame period, the non-display frame period or the shutdown state, under the control of a high voltage signal of the control signal, the selection module outputs a second data signal to the display module, a pixel circuit of the display module is in a reverse bias state, the driving transistor is 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 current among the driving transistors is further reduced, and the display uniformity of the display module is improved.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of a 3T1C pixel in the prior art.
Fig. 2 is a schematic diagram of threshold values of driving tfts in a pixel circuit in the prior art.
Fig. 3 is a schematic diagram of a part of circuit connections of a display driving circuit according to the present invention.
Fig. 4 is a schematic circuit diagram of another part of the display driving circuit according to the present invention.
Fig. 5 is a 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 inputting a first data signal/a second data signal according to the present invention.
FIG. 7 is a schematic diagram of switching data in a packet between two adjacent frames according to the present invention.
Fig. 8 is a schematic diagram of a threshold of a driving thin film transistor in a pixel circuit according to the present invention.
Fig. 9 is a flowchart illustrating a driving method of a display driving circuit according to the present invention.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings that 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 ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals, and broken lines in the drawings indicate that the elements do not exist in the structures, and only the shapes and positions of the structures are explained.
In practice, due to factors such as manufacturing process and conditions, electrical characteristics (mainly including threshold voltage Vth and K value) of driving transistors in a display device have a certain difference, so that even though the driving transistors in each pixel have the same driving voltage, the currents flowing through OLEDs are different, and further the light emitting luminance of the light emitting devices in each sub-pixel is different. As shown in fig. 2, the present invention is directed to the problem that the conventional external compensation scheme cannot delay aging of the driving transistor, the threshold of the driving transistor changes with the increase of the operating time, the source IC needs to detect and compensate the threshold voltage in real time, and the detection range of the source IC for the threshold voltage is limited, when the actual threshold voltage of part of the driving transistors is greater than the driving voltage, and the actual threshold voltage of part of the driving transistors is greater than the detection range of the source IC, the threshold voltage change of the pixel circuit cannot be accurately detected by the conventional threshold voltage detection method, so that the source driving module cannot perform effective data voltage compensation, which results in poor compensation effect of the data voltage and affects display uniformity of the display device, and this embodiment can solve the problem.
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 selection module and inputs a control signal to a control end of the selection module; the reverse bias circuit inputs a second data signal to a second input end of the selection module; in the display time of a display frame period, under the control of a low voltage signal of a control signal, a selection module outputs a first data signal to a display module, the display module normally emits light, in the non-display time of the display frame period, the non-display frame period or the shutdown state, under the control of a high voltage signal of the control signal, the selection module outputs a second data signal to the display module, a pixel circuit of the display module is in a reverse bias state, the driving transistor is 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 current 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 arranged 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 of a driving thin film transistor of the display module 104, generate a compensation data voltage according to the threshold of the driving thin film transistor, update an existing compensation data voltage, and feed back the threshold of the driving thin film transistor to the TCON module; the TCON module 101 generates a corresponding display data signal and a corresponding control signal according to a threshold variation of the driving tft, and sends the display data signal and the corresponding control signal to the source driving module 102, and the source driving module 102 superimposes the display data signal and the compensation data voltage through a corresponding operation 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, and the second input terminals 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 driver module 102 inputs the first data signal Dn (D1, D2, D3 to Dn) to the first input port 1062 of the select module 106, and inputs the control signal Mn (M1, M2, M3 to Mn) to the control port 1061 of the select module 106; the inverse 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 inverse bias circuit 105 through the same signal line, the second data signal Vstress is a reverse Stress voltage signal, and the reverse Stress voltage signal can change the threshold voltage of the tft (so that the threshold voltage is shifted in the negative Vth direction), thereby compensating for the Vth forward shift problem caused by the forward bias of the driving tft during the normal display of the first data voltage.
Each of the select modules 106 includes a first thin film transistor T1 and a second thin film transistor T2, a source of the first thin film transistor T1 and a source of the second thin film transistor T2 are electrically connected to the first input port 1062 and the second input port 1063 of the select 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 both 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 both electrically connected to the output 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 is 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 port 1064 of the selection module 106 outputs the first data signal D1; when the control signal M1 is at a high level 1, the first tft T1 is turned off, the second tft T2 is turned on, and the output port 1064 of the selection module 106 outputs the second data signal Vstress. The first data signal D1 is smaller than the second data signal vsstress, the first data signal D1 is a positive dc voltage signal, and the second data signal vsstress 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 a first scan line WR, a source of the switching thin film transistor T3 is electrically connected to an output terminal 1064 of the selection module 106, and a drain of the switching thin film transistor T3 is electrically connected to a 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 positive power supply 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 negative power supply voltage EVDD; the gate of the detection thin film transistor T5 is electrically connected to the second scan line RD, the source of the detection thin film transistor T5 is electrically connected to the second node s, and the drain of the detection thin film transistor T5 is electrically connected to the ADC module 1021 through the sensing signal line; a storage capacitor Cst is disposed between the first node g and the second node s.
The ADC module is used to obtain the 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 a threshold of the driving tft T4, 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, 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 end 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 normally works. The output end of the selection module MUX outputs a second data signal VStress, the voltage Vg of the first node g is less than 0, the pixel circuit is reversely biased, the driving transistor is tempered, the electronic state 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 the first data signal Vdate, M1 of n frame is high potential 1, Sn is the second data signal VStress. The first data signal Vdate is greater than the second data signal VStressThe first data signal Vdate is preferably a forward direct current voltage signal, and the second data signal V is preferably a forward direct current voltage signalStressPreferably a negative dc voltage signal. According to the invention, the 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, and different reverse bias duty ratios (time) or amplitudes are controlled according to the difference of forward offset 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 offsets are subjected to reverse offsets with different time or amplitude, thereby realizing accurate compensation of the threshold voltage Vth characteristic of the driving thin film transistor, and further enabling the driving thin film transistor to driveThe difference of current between the moving thin film transistors is reduced, the display uniformity is improved, the display effect is prevented from being influenced, and the execution of reverse bias can be preferably performed by system control under the condition of shutdown regularly.
As shown in fig. 8, in the case of the display driving circuit of the present invention, the threshold voltage of the driving tft in the pixel circuit changes slightly, so as to ensure that the threshold voltage clock of the driving tft is kept at a constant level and 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 a display driving circuit, the method comprising:
step S10, the ADC module obtains a threshold value change of a driving thin film transistor of a pixel circuit of the display module, generates a compensation data signal, and feeds back the threshold value of the driving thin film transistor to the TCON module, where 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 the source driver module, and sends the second data signal to the reverse bias circuit, where the first data signal is a superimposed electrical signal of the display data signal and the compensation data voltage.
In step S20, the source driver 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 a source of a switching thin film transistor of the pixel circuit, and the pixel circuit is driven normally; when the control signal is a high-voltage signal 1, the selection module inputs the second data signal to a source electrode of a switch 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 steps S10 to S30 are adopted to perform normal driving and reverse bias on all the pixel circuits sequentially or simultaneously.
The time for reverse biasing the pixel circuit of step S30 is preferably within the non-display time of the display frame period, within the non-display frame period, or in a power-off state.
The embodiment of the invention provides a display driving circuit and a driving method thereof, wherein the display driving circuit comprises a display module, a source electrode driving module, a reverse bias circuit and a plurality of selection modules 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 selection module and inputs a control signal to a control end of the selection module; the reverse bias circuit inputs a second data signal to a second input end of the selection module; in the display time of a display frame period, under the control of a low voltage signal of a control signal, a selection module outputs a first data signal to a display module, the display module normally emits light, in the non-display time of the display frame period, the non-display frame period or the shutdown state, under the control of a high voltage signal of the control signal, the selection module outputs a second data signal to the display module, a pixel circuit of the display module is in a reverse bias state, the driving transistor is 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 current 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 with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims (10)

1. A 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 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 selection module and inputs a control signal to a control end of the selection 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.
2. The display driving circuit according to claim 1, wherein the display driving circuit further comprises a TCON module, and the source driving module further comprises an ADC module, wherein the ADC module is configured to obtain a threshold of a driving thin film transistor of the display module, generate a compensation data voltage according to the threshold of the driving thin film transistor, update an existing compensation data voltage, and feed back the threshold 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 variation of the driving thin film transistor and sends the display data signal and the control signal to the source electrode driving module.
3. The display driving circuit according to claim 2, wherein the first data signal is a superimposed electrical signal of the display data signal and the compensation data voltage.
4. The display driving circuit according to claim 2, wherein 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, the first data signal is a positive voltage, and the second data signal is a negative voltage.
5. The display driving circuit according to claim 4, wherein the second input terminals of all the selection modules are electrically connected to the same reverse bias circuit through the same signal line.
6. The display driving circuit according to claim 1, wherein each of the selection modules comprises a first thin film transistor and a second thin film transistor, and a source of the first thin film transistor and a source of the second thin film transistor are 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 is connected with the grid electrode of the second thin film transistor in series, and the grid electrode of the first thin film transistor and the grid electrode of the second thin film transistor are both electrically connected with the control end of the selection module;
the drain electrode of the first thin film transistor is connected with the drain electrode of the second thin film transistor in series, and the drain electrode of the first thin film transistor and the drain electrode of the second thin film transistor are both electrically connected with the output end of the selection module.
7. The display driving circuit according to claim 6, 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.
8. The display driving circuit according to claim 6, wherein the display module comprises an array of 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 switch thin film transistor is electrically connected with the first scanning line, the source electrode of the switch thin film transistor is electrically connected with the output end of the selection module, and the drain electrode of the switch 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 the positive voltage of the power supply, the drain electrode of the driving thin film transistor, one end of the light-emitting device and the source electrode of the detection thin film transistor are electrically connected with the second node, and the other end of the light-emitting device is electrically connected with the negative voltage of the power supply; 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 disposed between the first node and the second node.
9. The display driver circuit according to claim 8, wherein the control signal is a low potential of 0 or a high potential of 1;
when the control signal is at a low potential of 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 switch 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 greater than the threshold voltage of the driving thin film transistor;
when the control signal is at a high potential of 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 greater than the threshold voltage of the driving thin film transistor.
10. A driving method using the display driving circuit according to any one of claims 1 to 9, comprising:
step S10, an ADC module obtains 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, 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 superimposed electrical signal of the display data signal and the compensation data voltage;
step S20, the source driver module respectively inputs the first data signal and the control signal to a first input terminal and a control terminal of a 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 a source of a switching thin film transistor of the pixel circuit, and the pixel circuit is driven normally; when the control signal is a high-voltage signal 1, the selection module inputs the second data signal to a source electrode of a switch thin film transistor of the pixel circuit, and the pixel circuit is reversely biased.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114038393A (en) * 2021-07-16 2022-02-11 重庆康佳光电技术研究院有限公司 Pixel circuit and display panel
CN115273737A (en) * 2022-08-25 2022-11-01 厦门天马显示科技有限公司 Pixel circuit, driving method thereof, display panel and display device
CN115312005A (en) * 2022-09-01 2022-11-08 武汉天马微电子有限公司 Display panel and display device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050269959A1 (en) * 2004-06-02 2005-12-08 Sony Corporation Pixel circuit, active matrix apparatus and display apparatus
TW200710808A (en) * 2005-07-20 2007-03-16 Pioneer Corp Active matrix display apparatus and driving method therefor
US20090295785A1 (en) * 2008-06-02 2009-12-03 Sony Corporation Display apparatus, driving methods and electronic instruments
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050269959A1 (en) * 2004-06-02 2005-12-08 Sony Corporation Pixel circuit, active matrix apparatus and display apparatus
TW200710808A (en) * 2005-07-20 2007-03-16 Pioneer Corp Active matrix display apparatus and driving method therefor
US20090295785A1 (en) * 2008-06-02 2009-12-03 Sony Corporation Display apparatus, driving methods and electronic instruments
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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114038393A (en) * 2021-07-16 2022-02-11 重庆康佳光电技术研究院有限公司 Pixel circuit and display panel
CN115273737A (en) * 2022-08-25 2022-11-01 厦门天马显示科技有限公司 Pixel circuit, driving method thereof, display panel and display device
CN115312005A (en) * 2022-09-01 2022-11-08 武汉天马微电子有限公司 Display panel and display device

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