CN113112961A - Display drive circuit and drive method of display drive circuit - Google Patents
Display drive circuit and drive method of display drive circuit Download PDFInfo
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- CN113112961A CN113112961A CN202110389684.9A CN202110389684A CN113112961A CN 113112961 A CN113112961 A CN 113112961A CN 202110389684 A CN202110389684 A CN 202110389684A CN 113112961 A CN113112961 A CN 113112961A
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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
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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
- 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
Abstract
The embodiment of the invention provides a display driving circuit, which selects a compensated data signal output by a module to drive a pixel driving circuit in the display time of a display frame period; the reverse bias circuit and the time sequence control circuit are simple in structure, negative voltage signals do not need to pass through the source electrode driving module, the threshold value of the pixel driving circuit can be adjusted only through the selection module, the detection and compensation accuracy of the driving thin film transistor is improved, and the display quality of the display panel is improved.
Description
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
Compared with a liquid crystal display panel, an existing AMOLED (Active Matrix Organic Light Emitting Diode) display panel has a fast response speed, good viewing angle characteristics, and excellent color gamut performance, and is gradually becoming a next-generation preferred novel display technology.
The AMOLED display has the problems of life attenuation, afterimage and the like due to the characteristic drift of the thin film transistor, so that various different compensation schemes are developed, and the AMOLED display is mainly classified into two types of internal compensation realized by utilizing 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 the reasons of good compensation effect, high aperture ratio and the like. In the external compensation scheme of the existing self-luminous display, because an IGZO type TFT and an a-si type thin film transistor are commonly adopted in the self-luminous display, the Vth drift range is large in the life attenuation process, but the detection range of a source electrode driving module to threshold voltage is limited, and when the threshold voltage drift of the driving thin film transistor exceeds the sampling range of the source electrode driving module, the problem of poor compensation effect occurs. Experiments prove that the characteristic drift range of the driving thin film transistor can be controlled in a reverse negative voltage driving mode, but the source driving module is reversely required to have negative voltage output capacity, the manufacturing process difficulty is high, and the cost for redesigning and developing the source driving module is high.
In summary, a new display driving circuit and a driving method of the display driving circuit are needed to solve the problems that redesigning and developing the existing source driving module in the prior art are high in cost, the existing source driving module has no reverse negative voltage driving capability, and when the threshold voltage drift of the driving thin film transistor exceeds the sampling range of the source driving module, the compensation effect is poor.
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 redesign and development of the existing source electrode driving module in the prior art are high in cost, the existing source electrode driving module has no reverse negative pressure driving capability, and when the threshold voltage drift of a driving thin film transistor exceeds the sampling range of the source electrode driving module, the compensation effect is poor.
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, a time sequence control 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 compensated data signal to a first input end of the selection module, and the time sequence control circuit inputs a control signal to a control end of the selection module; the reverse bias circuit inputs a negative voltage signal to a second input end of the selection module; and the selection module outputs the compensated data signal or the negative pressure signal to the display module under the control of the control signal.
According to a preferred embodiment of the present invention, the control terminals of all the selection modules are electrically connected to the same timing control circuit, and the second input terminals of all the selection modules are electrically connected to the same reverse bias circuit.
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 control signal is a high voltage signal 1 or a low voltage signal 0, when the control signal is the low voltage signal 0, the first thin film transistor is turned on, the second thin film transistor is turned off, the compensated data signal is output from the output terminal of the selection module to the display module, and the pixel circuit of the display module operates normally; when the control signal is a high-voltage signal 1, the first thin film transistor is turned off, the second thin film transistor is turned on, the negative-voltage signal is output to the display module by the output end of the selection module, and the pixel circuit of the display module is reversely biased.
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 pixel circuit includes a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a storage capacitor Cst, and a light emitting device;
the grid electrode of the third thin film transistor is electrically connected with the first scanning line, the source electrode of the third thin film transistor is electrically connected with the output end of the selection module, and the drain electrode of the third thin film transistor is electrically connected with the first node; the grid electrode of the fourth thin film transistor is electrically connected with the first node, the source electrode of the fourth thin film transistor is electrically connected with a positive voltage of a power supply, the drain electrode of the fourth thin film transistor, one end of the light-emitting device and the source electrode of the fifth thin film transistor are electrically connected with a second node, the other end of the light-emitting device is electrically connected with a negative voltage of the power supply, the grid electrode of the fifth thin film transistor is electrically connected with the second scanning line, and the drain electrode of the fifth thin film transistor is electrically connected with the sensing module through an 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 sensing module is an ADC module, the ADC module is configured to detect the fourth tft threshold Vth and the process characteristic parameter k value, and generate a compensation electrical signal according to the fourth tft threshold Vth and the process characteristic parameter k value, and the source driving module updates the existing compensation data signal according to the compensation data signal.
According to a preferred embodiment of the present invention, the compensated data signal is a superimposed electrical signal of a display data signal of a display image received by the source driving module and the existing compensation data signal.
According to a preferred embodiment of the present invention, the negative voltage signal is a constant voltage.
According to the display driving circuit of the above embodiment, the present invention also provides a driving method of a display driving circuit, the method including:
step S10, the source electrode driving module inputs the compensated data signal to the first input end of the selection module, and the time sequence control circuit inputs the control signal to the control end of the selection module; the reverse bias circuit inputs a negative voltage signal to a second input end of the selection module;
step S20, in the display time of the display frame period of the display module, the control signal is a low voltage signal 0, the selection module inputs the compensated data signal to the source of the third tft of the pixel circuit, and the pixel circuit operates normally, where the compensated data signal is a superimposed electrical signal of the display data signal of the display image received by the source driving module and the existing compensation data signal;
step S30, when the display module is not turned off, the control signal is a high voltage signal 1, the selection module inputs the negative voltage signal to the source of the third tft of the pixel circuit, and the pixel circuit is reversely biased to adjust the threshold of the fourth tft;
step S40, after step S30 is completed, the sensing module detects the threshold Vth and the process characteristic parameter k of the fourth tft of the pixel circuit, generates compensation data according to the threshold Vth and the process characteristic parameter k of the fourth tft, sends the compensation data to the source driving module, updates the existing compensation data signal, and then loops step S20 and step S30.
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, a time sequence control 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 compensated data signal to a first input end of the selection module, and the time sequence control circuit inputs a control signal to a control end of the selection module; the reverse bias circuit inputs a negative voltage signal to a second input end of the selection module; the selection module outputs the compensated data signal or the negative pressure signal to the display module under the control of the control signal. The invention adopts the design of adding the selection module MUX, realizes the normal display of the pixel driving circuit of the display module and the switching of the detected data voltage output and the negative voltage output in a low-cost mode, realizes the positive drift of the driving thin film transistor threshold voltage of the pixel driving circuit through the negative voltage, thereby ensuring that the driving thin film transistor threshold voltage is in the detection range of the source electrode driving module, improving the detection and compensation effects, having no need of the source electrode driving module to have the function of outputting the negative voltage, improving the detection and compensation precision, improving the display effect and simultaneously reducing the cost of the display device.
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 schematic structural diagram of a display device according to the present invention.
Fig. 2 is a schematic diagram of threshold voltage variation of a driving thin film transistor in the prior art.
FIG. 3 is a schematic diagram of a display driving circuit according to the present invention.
Fig. 4 is a schematic diagram of a circuit connection of a selection module in a display driving circuit according to the present invention.
Fig. 5 is a schematic diagram of a pixel circuit connection of a display module in a display driving circuit according to the present invention.
FIG. 6 is a schematic diagram of the variation of the threshold voltage of a driving TFT according to the present invention.
Fig. 7 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.
The invention aims at the problems that the redesign and development of the existing source electrode driving module in the prior art are high in cost, the existing source electrode driving module has no reverse negative pressure driving capability, and when the threshold voltage drift of the driving thin film transistor exceeds the sampling range of the source electrode driving module, the compensation effect is poor, and the defect can be solved by the embodiment.
As shown in fig. 1, the present invention provides a schematic structural diagram of a display device. The display device 10 includes a TCON module 11, a source driving module 12, a gate driving module 13, and a display module 14, and the gate driving module 13 receives a clock signal, a scan start signal, and the like supplied from the TCON module 11 and generates scan signals to be supplied to the scan lines S1, S2, S3 to Sm. For example, the TCON module 11 may sequentially supply scan signals, each having an on-level pulse, to the scan lines S1 to Sm. For example, the TCON module 11 may take the form of a shift register, and may generate the scan signals such that the scan start signal in the form of an on horizontal pulse is sequentially delivered to the next stage circuit under the control of the clock signal. Here, m may be a natural number greater than zero. The gate driving module 13 provides the same-level scanning signal to the display module 14. The source driving module 12 may generate a display data signal to be provided to the data line using the gray scale value and the control signal received from the TCON module 11. For example, the source driving module 12 may sample gray-scale values using a clock signal and apply display data voltages corresponding to the gray-scale values to the data lines D1 to Dn as data signals. Here, n may be a natural number greater than zero. The display unit 14 includes driving pixel circuits arranged in an array, and after the driving pixel circuits receive data signals and scanning signals, corresponding pixels are lighted up, and the display unit 14 displays images and characters.
As shown in fig. 2, in a schematic diagram of a phenomenon that a threshold voltage of a driving thin film transistor of a driving pixel circuit drifts with a change of an operating time in the prior art, the threshold voltage of the driving thin film transistor fluctuates greatly between 0 and n times, and a data voltage needs to be compensated in time to keep an initial value difference of a voltage between a gate and a drain of the driving thin film transistor relatively stable, so that display uniformity of each pixel can be ensured. The drift or aging of the threshold voltage Vth of the driving thin film transistor causes a significant difference in current flowing through the light emitting device, and a part of the threshold voltage Vth exceeds the detection range of the source drive IC, so that the source drive module cannot compensate the data voltage in time, and then cannot provide the compensation data voltage for the gate and the compensation reference voltage for the drain of the driving thin film transistor in time, which may cause the light emitting time and the non-light emitting time of the light emitting device of the driving pixel circuit to change, resulting in different lighting time of the corresponding pixel and non-uniformity of the display unit, and affecting the display quality and the picture effect of the display panel.
The present invention provides a display driving circuit, which includes a display module, a source driving module, a reverse bias circuit, a timing control circuit, and a plurality of selection modules for connecting the display module and the source 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 compensated data signal to a first input end of the selection module, and the time sequence control circuit inputs a control signal to a control end of the selection module; the reverse bias circuit inputs a negative voltage signal to a second input end of the selection module; the selection module outputs the compensated data signal or the negative pressure signal to the display module under the control of the control signal. The invention adopts the design of adding the selection module MUX, realizes the normal display of the pixel driving circuit of the display module and the switching of the detected data voltage output and the negative voltage output in a low-cost mode, realizes the positive drift of the driving thin film transistor threshold voltage of the pixel driving circuit through the negative voltage, thereby ensuring that the driving thin film transistor threshold voltage is in the detection range of the source electrode driving module, improving the detection and compensation effects, having no need of the source electrode driving module to have the function of outputting the negative voltage, improving the detection and compensation precision, improving the display effect and simultaneously reducing the cost of the display device.
Specifically, as shown in fig. 3 and 4, the display driving circuit 100 includes a display module 105, a source driving module 101, a reverse bias circuit 102, a timing control circuit 103, and a plurality of selection modules 104 for connecting the display module 105 and the source driving module 101; the selection module 104 includes a first input terminal 1042, a second input terminal 1043, a control terminal 1041, and an output terminal 1044; the source driving module 101 inputs the compensated data signals (D1, D2... Dn-1, Dn) to the first input terminal 1042 of the selection module 104, and the timing control circuit 103 inputs the control signal Select to the control terminal 1041 of the selection module 104; the reverse bias circuit 102 inputs a negative voltage signal vsstress to the second input terminal 1043 of the selection module 104; the selection module 104 outputs the compensated data signal (D1, D2... Dn-1, Dn) or the negative voltage signal Vstress to the display module 105 under the control of the control signal Select.
In this embodiment, the control terminals 1041 of all the select modules 104 are electrically connected to the same timing control circuit 103, the second input terminals 1043 of all the select modules 104 are electrically connected to the same reverse bias circuit 102, the first input terminal 1041 of each select module 104 is connected to one of the data lines Dn of the source driver module 101, the output terminal 1044 of the output terminal 1041 of each select module 104 outputs an electrical signal Sn, where the electrical signal Sn is a compensated data signal (D1, D2... Dn-1, Dn) or a negative voltage signal Vstress, the negative voltage signal Vstress is preferably a constant voltage value, and the negative voltage signal Vstress is preferably-8V-0V.
Each of the selection modules 104 includes a first thin film transistor T1 and a second thin film transistor T2, and 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 terminal 1042 and the second input terminal 1043 of the selection module 104, 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 1041 of the selection module 104. 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 terminal 1044 of the selection module 104.
The control signal Select is a high voltage signal 1 or a low voltage signal 0, when the control signal Select is a low voltage signal 0, the first thin film transistor T1 is turned on, the second thin film transistor T2 is turned off, the output terminal 1044 of the selection module 104 outputs the compensated data signal Dn to the display module 105, and the pixel circuit of the display module 105 operates normally; when the control signal Select is the high voltage signal 1, the first thin film transistor T1 is turned off, the second thin film transistor T2 is turned on, the negative voltage signal Vstress is output from the output terminal of the selection module 104 to the display module 105, and the pixel circuit of the display module 105 is reversely biased. The first thin film transistor T1 is a P-type thin film transistor, and the second thin film transistor T2 is an N-type thin film transistor.
In the embodiment, a design of adding a selection module MUX is adopted, the selection module MUX is uniformly regulated and controlled to switch the output selection of Vdata and Vstress, the switching of data voltage output for normal display and detection and reverse negative voltage signal Vstress output is realized in a low-cost mode, the control of the threshold voltage of a driving thin film transistor of a pixel circuit of the display module 105 is realized through the reverse negative voltage signal Vstress, the threshold voltage Vth of the driving thin film transistor of a panel is positively shifted, so that the Vth is ensured to be in the detection range of the source electrode driving module 101, the detection and compensation precision is improved, and the display effect is improved. The negative voltage signal Vstress is provided by the reverse bias circuit 102, and the reverse bias circuit 102 is an external input bypass negative voltage signal transmitter, or the reverse bias circuit 102 is generated by a DC-DC circuit on a TCON board of the TCON module, and is transmitted to the second input terminal 1043 of the selection module 104 through hardware (flexible flat cable + flexible circuit board wiring + bypass flip-chip film wiring).
As shown in fig. 5, the pixel circuit of the present embodiment adopts a 3T1C architecture, and includes a third thin film transistor T3, a fourth thin film transistor T4, a fifth thin film transistor T5, a storage capacitor Cst, and a light emitting device, which is an LED or OLED device, the third thin film transistor T3 serving as a switching thin film transistor, the fourth thin film transistor T4 serving as a driving thin film transistor, and the fifth thin film transistor T5 serving as a sensing thin film transistor.
The gate of the third thin film transistor T3 is electrically connected to the first scan line WR, the source of the third thin film transistor T3 is electrically connected to the output terminal 1044 of the selection module 104, and the drain of the third thin film transistor T3 is electrically connected to the first node Vg; a gate of the fourth thin film transistor T4 is electrically connected to the first node Vg, a source of the fourth thin film transistor T4 is electrically connected to the positive power supply voltage EVDD, a drain of the fourth thin film transistor T4 and one end of the light emitting device are both electrically connected to the second node Vs, and the other end of the light emitting device is electrically connected to the negative power supply voltage EVSS; a gate of the fifth thin film transistor T5 is electrically connected to the second scan line RD, and a source of the fifth thin film transistor T5 is electrically connected to the second node Vs; a storage capacitor Cst is disposed between the first node Vg and the second node Vs, and a drain of the fifth thin film transistor T5 is electrically connected to the sensing module 1011 through a sensing signal line.
The gate of the fourth thin film transistor T4 is fed with a negative voltage signal Vstress, the drain of the fourth thin film transistor T4 is fed with a reference voltage Vref, the negative voltage signal Vstress is smaller than the reference voltage Vref, and the difference between the reference voltage Vref and the negative voltage signal Vstress is larger than the threshold voltage of the fourth thin film transistor T4, so that the fourth thin film transistor T4 is reversely biased.
The sensing module 1011 of this embodiment is preferably an ADC module, the ADC module is configured to detect the threshold Vth and the process characteristic parameter k of the fourth tft T4, and generate compensation data according to the threshold Vth and the process characteristic parameter k of the fourth tft T4, the source driving module updates the existing compensation data signal according to the compensation data, and the compensated data signal of this embodiment is a superimposed electrical signal of the source driving module receiving the display data signal of the display image and the existing compensation data signal.
All the selection modules 104 in this embodiment are controlled by a control signal Select, and Vstress is an externally-connected side branch negative voltage signal. When Select is 0, Sn is dn (vdata), the display and detection functions are realized; when Select is 1, Sn is Vstress, the selection module 104 outputs negative voltage, sets the gate Vs of the driving tft to be negative voltage Vstress in accordance with the scan signal, and charges the positive voltage Vref to the drain Vs of the driving tft through the sensing signal line, thereby implementing reverse bias of the driving tft. In the embodiment, the reverse bias is preferably started at regular time intervals, preferably at non-display time of a display frame, non-display frame time or when the power is not turned off after the display is turned off, and the reverse bias is maintained for a certain time, and then the threshold Vth of the driving thin film transistor is detected and the data voltage is updated. The method and the structure for realizing the reverse Vstress in the scheme are simple, the negative voltage signal only needs to enter the selection module MUX, the source electrode driving module 101 is not required to have a negative voltage output function, reverse bias can be realized with low cost, and therefore the threshold value Vth of the driving thin film transistor of the panel is controlled in the detection range of the source electrode driving module 101, the detection and compensation effects of the source electrode driving module 101 are improved, and various scenes can be applied according to the low cost advantage.
The threshold voltage of the driving thin film transistor of the conventional driving pixel unit is changed, the threshold voltage value of the driving thin film transistor is in a wave shape along with the display time along with the fact that the driving thin film transistor is always in a forward deflection state, and when the threshold voltage of the driving thin film transistor is larger than a data signal, the detection TFT of the driving pixel circuit cannot detect the threshold value of the driving thin film transistor, as shown in fig. 6, the threshold voltage of the driving thin film transistor of the driving pixel unit is changed schematically, through the design of the selection module MUX, the output selection of Vdata and Vstress is switched through uniformly regulating and controlling the selection module MUX, the switching of the data voltage output of normal display and detection and the reverse negative voltage signal Vstress output is realized in a low-cost mode, the forward drift of the threshold voltage Vth of the driving thin film transistor of the panel is ensured, and the Vth is ensured to be within the detection range of the source electrode driving module 101, the detection and compensation precision is improved, and the display effect is improved.
According to the display driving circuit of the above embodiment, as shown in fig. 7, the present invention further provides a driving method of the display driving circuit, the method comprising:
step S10, the source electrode driving module inputs the compensated data signal to the first input end of the selection module, and the time sequence control circuit inputs the control signal to the control end of the selection module; and the reverse bias circuit inputs a negative voltage signal to the second input end of the selection module.
Step S20, in the display time of the display frame period of the display module, the control signal is a low voltage signal 0, the selection module inputs the compensated data signal to the source of the third tft of the pixel circuit, and the pixel circuit operates normally, where the compensated data signal is a superimposed electrical signal of the display data signal of the display image received by the source driving module and the existing compensation data signal.
Step S30, when the display module is turned off or is not powered off during the non-display time of the display frame period, the non-display frame period, the control signal is a high voltage signal 1, the selection module inputs the negative voltage signal to the source of the third tft of the pixel circuit, and the pixel circuit is reversely biased to adjust the threshold of the fourth tft.
Step S40, after step S30 is completed, the sensing module detects the threshold Vth and the process characteristic parameter k of the fourth tft of the pixel circuit, generates compensation data according to the threshold Vth and the process characteristic parameter k of the fourth tft, sends the compensation data to the source driving module, updates the existing compensation data signal, and then loops step S20 and step S30.
The embodiment of the invention provides a display driving circuit, which comprises a display module, a source electrode driving module, a reverse bias circuit, a time sequence control 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 compensated data signal to a first input end of the selection module, and the time sequence control circuit inputs a control signal to a control end of the selection module; the reverse bias circuit inputs a negative voltage signal to a second input end of the selection module; the selection module outputs the compensated data signal or the negative pressure signal to the display module under the control of the control signal. The invention adopts the design of adding the selection module MUX, realizes the normal display of the pixel driving circuit of the display module and the switching of the detected data voltage output and the negative voltage output in a low-cost mode, realizes the positive drift of the driving thin film transistor threshold voltage of the pixel driving circuit through the negative voltage, thereby ensuring that the driving thin film transistor threshold voltage is in the detection range of the source electrode driving module, improving the detection and compensation effects, having no need of the source electrode driving module to have the function of outputting the negative voltage, improving the detection and compensation precision, improving the display effect and simultaneously reducing the cost of the display device.
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, a time sequence control 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 compensated data signal to a first input end of the selection module, and the time sequence control circuit inputs a control signal to a control end of the selection module; the reverse bias circuit inputs a negative voltage signal to a second input end of the selection module; and the selection module outputs the compensated data signal or the negative pressure signal to the display module under the control of the control signal.
2. The display driving circuit according to claim 1, wherein the control terminals of all the selection modules are electrically connected to the same timing control circuit, and the second input terminals of all the selection modules are electrically connected to the same reverse bias circuit.
3. 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.
4. The display driving circuit according to claim 3, wherein the control signal is a high voltage signal 1 or a low voltage signal 0, when the control signal is the low voltage signal 0, the first thin film transistor is turned on, the second thin film transistor is turned off, the compensated data signal is output from the output terminal of the selection module to the display module, and the pixel circuit of the display module operates normally; when the control signal is a high-voltage signal 1, the first thin film transistor is turned off, the second thin film transistor is turned on, the negative-voltage signal is output to the display module by the output end of the selection module, and the pixel circuit of the display module is reversely biased.
5. The display driving circuit according to claim 4, 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.
6. The display driver circuit according to claim 4, wherein the pixel circuit comprises a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a storage capacitor Cst, and a light emitting device;
the grid electrode of the third thin film transistor is electrically connected with the first scanning line, the source electrode of the third thin film transistor is electrically connected with the output end of the selection module, and the drain electrode of the third thin film transistor is electrically connected with the first node; the grid electrode of the fourth thin film transistor is electrically connected with the first node, the source electrode of the fourth thin film transistor is electrically connected with a positive voltage of a power supply, the drain electrode of the fourth thin film transistor, one end of the light-emitting device and the source electrode of the fifth thin film transistor are electrically connected with a second node, the other end of the light-emitting device is electrically connected with a negative voltage of the power supply, the grid electrode of the fifth thin film transistor is electrically connected with the second scanning line, and the drain electrode of the fifth thin film transistor is electrically connected with the sensing module through an induction signal line; a storage capacitor Cst is disposed between the first node and the second node.
7. The display driving circuit according to claim 6, wherein the sensing module is an ADC module, the ADC module is configured to detect a threshold Vth of the fourth TFT and a k value of a process characteristic parameter, and generate a compensation electrical signal according to the threshold Vth of the fourth TFT and the k value of the process characteristic parameter, and the source driving module updates an existing compensation data signal according to the compensation data signal.
8. The display driving circuit according to claim 7, wherein the compensated data signal is a superimposed electrical signal of a display data signal of a display image received by the source driving module and the existing compensation data signal.
9. The display driving circuit according to claim 1, wherein the negative voltage signal is a constant voltage value.
10. A driving method using the display driving circuit according to any one of claims 1 to 9, the method comprising:
step S10, the source electrode driving module inputs the compensated data signal to the first input end of the selection module, and the time sequence control circuit inputs the control signal to the control end of the selection module; the reverse bias circuit inputs a negative voltage signal to a second input end of the selection module;
step S20, in the display time of the display frame period of the display module, the control signal is a low voltage signal 0, the selection module inputs the compensated data signal to the source of the third tft of the pixel circuit, and the pixel circuit operates normally, where the compensated data signal is a superimposed electrical signal of the display data signal of the display image received by the source driving module and the existing compensation data signal;
step S30, when the display module is not turned off, the control signal is a high voltage signal 1, the selection module inputs the negative voltage signal to the source of the third tft of the pixel circuit, and the pixel circuit is reversely biased to adjust the threshold of the fourth tft;
step S40, after step S30 is completed, the sensing module detects the threshold Vth and the process characteristic parameter k of the fourth tft of the pixel circuit, generates compensation data according to the threshold Vth and the process characteristic parameter k of the fourth tft, sends the compensation data to the source driving module, updates the existing compensation data signal, and then loops step S20 and step S30.
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