CN114550656A - Drive circuit, drive device, and display device - Google Patents
Drive circuit, drive device, and display device Download PDFInfo
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- CN114550656A CN114550656A CN202210204069.0A CN202210204069A CN114550656A CN 114550656 A CN114550656 A CN 114550656A CN 202210204069 A CN202210204069 A CN 202210204069A CN 114550656 A CN114550656 A CN 114550656A
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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
- G09G3/3233—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 current through the light-emitting element
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The application provides a drive circuit, drive arrangement and display device relates to and shows technical field, and this drive circuit includes drive module and processing module, and drive module is connected with drive element's first pole, and load and processing module are connected to drive element's third pole, drive element's second pole power supply. The driving module is used for providing a driving voltage for the first pole of the driving element and compensating the threshold voltage of the first pole. The processing module is used for acquiring the driving current of the driving element and controlling the driving voltage provided by the driving module to the driving element to be a first voltage or a second voltage according to the driving current, wherein the first voltage is a data voltage, and the second voltage comprises the data voltage and a threshold voltage. According to the scheme of the application, the threshold voltage can be compensated or not compensated according to actual requirements, so that the threshold voltage is not always compensated by the driving module, the power consumption generated by the driving module can be reduced, and the reaction speed of the light-emitting device is also improved.
Description
Technical Field
The present disclosure relates to display technologies, and in particular, to a driving circuit, a driving device, and a display device.
Background
An Active-matrix organic light-emitting diode (AMOLED) is evaluated as one of the most potential display technologies due to its advantages of self-luminescence, low power consumption, wide viewing angle, high color gamut, high contrast, and fast response. The brightness of an Organic Light-Emitting semiconductor (OLED), also called an OLED Light-Emitting device, mainly depends on the magnitude of the driving current, and the larger the current is, the higher the brightness is, so the OLED device has a high requirement on the stability of the driving device.
Because the OLED is current driven, when the threshold voltage of a Thin Film Transistor (TFT) is shifted, the current driving of the OLED will be unstable, and further the luminance is uneven.
Disclosure of Invention
The application provides a driving circuit, a driving device and a display device, which are used for dynamically controlling whether to compensate threshold voltage for a driving element according to actual requirements on the premise of ensuring the stability of the driving element so as to reduce the power consumption generated by the continuous compensation of the threshold voltage by a compensation circuit.
The technical scheme is as follows:
in a first aspect, a driving circuit is provided, which includes: the driving module is also connected with a first pole of a driving element, a third pole of the driving element is connected with a load and the processing module, a second pole of the driving element is connected with a power supply, and the driving module is at least used for providing driving voltage for the first pole of the driving element and compensating threshold voltage of the first pole;
the processing module is configured to obtain a value of a driving current output by the driving element from the third pole under driving of the driving module, and to control the driving voltage provided by the driving module to the driving element through the first pole of the driving element according to the value of the driving current, where the driving voltage is a first voltage or a second voltage, the first voltage is a data voltage input to the driving module, and the second voltage includes the data voltage and the threshold voltage.
The application provides a driving circuit, which is provided with a processing module, wherein the processing module is used for acquiring the magnitude of the driving current output by the driving element from the third pole under the driving of the driving module, and then controlling the driving module to compensate the threshold voltage of the driving element according to the value of the driving current, namely enabling the driving voltage provided by the driving module to the driving element to comprise the data voltage and the threshold voltage, or stopping compensating the threshold voltage of the driving element, namely enabling the driving voltage provided by the driving module to the driving element to comprise the data voltage. This is because when the drive current supplied to the load by the drive element is low, the current is low when the drive element drives a load like a light emitting device or the like, so that the effect of unevenness in luminance of the light emitting device has little influence on the entire display effect, and when the drive current is high, the effect of unevenness in luminance has a large influence. Therefore, the scheme of the application can realize that the driving module is controlled to compensate the threshold voltage of the driving element when the threshold voltage needs to be compensated according to actual requirements, and the driving module is controlled to stop compensating the threshold voltage when the threshold voltage does not need to be compensated, namely, the purpose of dynamically controlling the driving module to compensate the threshold voltage of the driving element on the basis of ensuring the stability of the driving element is realized.
Optionally, the processing module is specifically configured to determine an input voltage according to the value of the driving current, and to control the driving module to provide the driving voltage to the driving element through the first pole to be the first voltage when the input voltage is less than or equal to a preset voltage, and to control the driving module to provide the driving voltage to the driving element through the first pole to be the second voltage when the input voltage is greater than the preset voltage.
The driving voltage of the driving element can be determined according to the magnitude of the driving current, the threshold voltage of the driving element can be compensated by controlling the driving module according to actual requirements when the threshold voltage needs to be compensated, and the threshold voltage can be stopped being compensated by controlling the driving module when the threshold voltage does not need to be compensated. The purpose that the driving element dynamically controls the driving module to compensate the threshold voltage of the driving element is achieved.
Optionally, when the input voltage is less than or equal to a preset voltage, the processing module is specifically configured to control the driving module to operate according to a first working timing sequence, and when the driving module operates according to the first working timing sequence, the driving module provides a driving voltage to the driving element through the first pole as the first voltage;
and when the input voltage is greater than the preset voltage, the processing module is specifically configured to control the driving module to operate according to a second working timing sequence, and when the driving module operates according to the second working timing sequence, the driving module supplies the driving voltage to the driving element through the first pole as the second voltage.
The processing module provided by the scheme selects and controls the driving module to operate different working time sequences according to the input voltage under the condition of different input voltages, wherein the first working time sequence enables the driving voltage of the driving element to be a first voltage, and the second working time sequence enables the driving voltage of the driving element to be a second voltage. According to different working time sequences, corresponding driving voltages can be strictly output.
Optionally, the processing module includes a conversion device, a comparison circuit, and a selection circuit; the conversion device is used for converting the driving current into an input voltage of the comparison circuit, and the input voltage is determined according to the driving current;
the comparison circuit is used for outputting a first trigger signal under the condition that the input voltage is less than or equal to the preset voltage, the first trigger signal is used for triggering the selection circuit to select a first mode, and outputting a second trigger signal under the condition that the input voltage is greater than the preset voltage, the second trigger signal is used for triggering the selection circuit to select a second mode, the first mode corresponds to a first working time sequence, and the second mode corresponds to a second working time sequence,
the selection circuit is configured to control the driving module to operate according to the first working timing sequence to provide the first voltage to the driving element through the first pole according to the first trigger signal, or control the driving module to operate according to the second working timing sequence to provide the second voltage to the driving element through the first pole according to the second trigger signal.
Optionally, the driving module includes a first switching device and a compensation circuit, a first pole of the first switching device is connected to the processing module, a second pole of the first switching device is connected to the data line, a third pole of the switching device is connected to the first pole of the driving element, a first end of the compensation circuit is connected to the first pole of the driving element, and a second end of the compensation circuit is grounded;
the first working time sequence comprises a plurality of cycles, the cycles comprise a first time period and a second time period according to the time sequence,
during a first period of each of the cycles, the first switching device is turned on, and the compensation circuit is used for storing electric energy by using the data voltage;
during a second time period of each of the cycles, the first switching device is open, and the compensation circuit is configured to discharge the electrical energy stored during the first time period to provide the first voltage to the first pole of the driving element.
Optionally, the selection circuit is specifically configured to output a first level signal to the first switching device in a first time period of each cycle included in the first working timing sequence according to the first trigger signal, and output a second level signal to the first switching device in a second time period of each cycle, where the first level signal is used to trigger the first switching device to be turned on, and the second level signal is used to trigger the first switching device to be turned off.
Optionally, the compensation circuit includes: a second switch device and an energy storage element, wherein a second pole of the second switch device and a first end of the energy storage element are connected to the first pole of the driving element, a third pole of the second switch device and a second end of the energy storage element are commonly grounded, and the first pole of the second switch device is connected to the processing module,
during a first time period of each cycle, the second switching device is turned off, and the energy storage element is used for converting the data voltage input to the energy storage element into electric energy;
during a second time period of each of the cycles, the second switching device is open and the energy storage element is configured to discharge the electrical energy to provide the first voltage to the first pole of the driving element.
Optionally, the driving module includes a first switching device and a compensation circuit, the compensation circuit includes a second switching device and an energy storage element, a first pole of the first switching device is connected to the processing module, a second pole of the first switching device is connected to the data line, a third pole of the switching device is connected to the first pole of the driving element, the first pole of the second switching device is connected to the processing module, the second pole of the first switching device is connected to the first pole of the driving element, and the third pole of the switching device is grounded;
the second working time sequence comprises one or more cycles, and the cycles comprise a third time period, a fourth time period, a fifth time period and a sixth time period according to the time sequence;
during a third period of each of the cycles, the first switching device is turned on and the second switching device is turned off, and the compensation circuit is configured to store electrical energy using the data voltage;
during a fourth time period of each of said cycles, said first switching device is off and said second switching device is on, said compensation circuit for discharging a portion of said electrical energy such that said voltage stored by said compensation circuit equals said threshold voltage;
during a fifth time period of each of the cycles, the first switching device is turned on and the second switching device is turned off, and the compensation circuit is configured to store electrical energy using the data voltage such that the voltage stored by the compensation circuit is equal to the sum of the threshold voltage and the data voltage;
during a sixth time period of each of the cycles, the first switching device is open, the second switching device is open, and the compensation circuit is operable to discharge the stored electrical energy during the fifth time period to provide the second voltage to the first pole of the drive element.
In a second aspect, a driving apparatus is provided, where the driving apparatus includes a driving element and the driving circuit as described above, a first pole of the driving element is connected to the driving module, a third pole of the driving element is connected to the processing module and the load, and a second pole of the driving element is connected to a power source.
In a third aspect, a display device is provided, which comprises the above-mentioned driving device.
It is understood that, the beneficial effects of the second and third aspects may be referred to the relevant description of the first aspect, and are not described herein again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a driving circuit according to an embodiment of the present disclosure;
fig. 2 is a first operation timing diagram of a driving circuit according to an embodiment of the present application;
fig. 3 is a second operation timing diagram of a driving circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a driving circuit according to an embodiment of the present disclosure;
fig. 5 is a circuit diagram of a driving circuit according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a driving circuit according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
It should be understood that reference to "a plurality" in this application means two or more. In the description of the present application, "/" means "or" unless otherwise stated, for example, a/B may mean a or B; "and/or" herein is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, for the convenience of clearly describing the technical solutions of the present application, the terms "first", "second", and the like are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
Before explaining the embodiments of the present application in detail, an application scenario of the embodiments of the present application will be described.
The OLED is current driven, and when the threshold voltage Vth of the TFT is shifted, the current driving of the OLED is unstable, that is, the driving current changes, and the luminance of the OLED is not uniform. In the current solution, the threshold voltage Vth of the TFT is compensated, but the power consumption of the OLED panel is also increased during the compensation process. In fact, when the driving current of the OLED is low, the effect of the non-uniform brightness does not greatly affect the display effect of the whole OLED display panel, and therefore, on the premise of not affecting the display effect of the display panel, the power consumption of the whole display panel can be reduced more effectively by adopting different driving methods under different conditions.
The driving circuit, the driving device, and the display device provided in the embodiments of the present application are explained in detail below.
As shown in fig. 1, fig. 1 provides a driving circuit including: a driving module 101 and a processing module 103 connected to the driving module 101, wherein the driving module 101 is further connected to a first pole of the driving element 102, a third pole of the driving element 102 is connected to the load 105 and the processing module 103, a second pole of the driving element 102 is connected to the power supply 104, and the driving module 101 is at least used for providing a driving voltage to the first pole of the driving element 102 and compensating a threshold voltage of the first pole. And a processing module 103, configured to obtain a driving current output by the driving element 102 from the third pole under the driving of the driving module 101, and to control the driving module 101 to provide a driving voltage to the driving element 102 through the first pole of the driving element 102 according to the driving current, where the driving voltage is a first voltage or a second voltage, the first voltage is a data voltage input to the driving module 101, and the second voltage includes a data voltage and a threshold voltage.
The driving module 101 is connected to a DATA line DATA, and the DATA line DATA is used for transmitting a DATA voltage to the driving module 101. The first pole of the driving element 102 is used to control the on/off of the driving element 102, and the data voltage is processed by the driving module 101 to provide different driving voltages to turn on the driving element 102 according to different situations.
The application provides a driving circuit, which is provided with a processing module, wherein the processing module is used for acquiring the magnitude of the driving current output by the driving element from the third pole under the driving of the driving module, and then controlling the driving module to compensate the threshold voltage of the driving element according to the value of the driving current, namely enabling the driving voltage provided by the driving module to the driving element to comprise the data voltage and the threshold voltage, or stopping compensating the threshold voltage of the driving element, namely enabling the driving voltage provided by the driving module to the driving element to comprise the data voltage. This is because when the drive current supplied to the load by the drive element is low, the current is low when the drive element drives a load like a light emitting device or the like, so that the effect of unevenness in luminance of the light emitting device has little influence on the entire display effect, and when the drive current is high, the effect of unevenness in luminance has a large influence. Therefore, the scheme of the application can realize that the driving module is controlled to compensate the threshold voltage of the driving element when the threshold voltage needs to be compensated according to actual requirements, and the driving module is controlled to stop compensating the threshold voltage when the threshold voltage does not need to be compensated, namely, the purpose of dynamically controlling the driving module to compensate the threshold voltage of the driving element on the basis of ensuring the stability of the driving element is realized.
The following will describe how the processing module 103 controls the driving voltage provided by the driving module 101 to the driving element 102 through the first pole of the driving element 102 according to the value of the driving current, in different cases, where the driving voltage is a specific process of the first voltage or the second voltage:
example 1, comparison of the relationship of the drive current and the preset current threshold:
case 1-1:
the processing module 103 is configured to, when the obtained driving current is less than or equal to the preset current threshold, control the driving module 101 to provide a driving voltage to the driving element 102 through the first pole of the driving element 102, where the driving voltage is a first voltage and the first voltage is a data voltage, and therefore in case 1, the data voltage is directly used as the driving voltage to turn on the driving element 102 without performing additional processing.
Cases 1-2:
the processing module 103 is configured to, when the obtained driving current is greater than the preset current threshold, control the driving module 101 to provide the driving voltage to the driving element through the first pole to be a second voltage, where the second voltage includes a data voltage and a threshold voltage, and therefore in case 2, a sum of the data voltage and the threshold voltage is used as the driving voltage to turn on the driving element 102, and the threshold voltage needs to be compensated.
For the specific implementation process that the processing module 103 is used to control the driving module 101 to provide the driving voltage to the driving element 102 through the first pole of the driving element 102, reference may be made to the description in the following embodiments, and details are not repeated here.
As can be seen from the above, in the present application, the driving module 101 compensates the driving element 102 for the threshold voltage when the driving current is greater than the preset current threshold, that is, the driving voltage provided to the driving element 102 includes the threshold voltage Vth in addition to the data voltage Vdata.
Specifically, as an example, an ammeter for measuring the driving current output by the third pole of the driving element 102 may be connected to the third pole of the driving element 102, and the ammeter is further connected to the processing module 103, so that the processing module 103 can obtain the driving current output by the third pole of the driving element 102 from the ammeter.
Example 2, comparing the relationship between the input voltage obtained based on the driving current and the preset voltage:
in an embodiment of the present application, the processing module 103 is specifically configured to determine an input voltage according to the driving current, and to control the driving module 101 to provide the driving voltage to the driving element 102 through the first pole of the driving element 102, where the input voltage is less than or equal to a preset voltage, and to control the driving voltage provided to the driving element 102 through the first pole by the driving module 101 to be a second voltage, where the input voltage is greater than the preset voltage.
Specifically, the processing module 103 sets a preset voltage for determining the magnitude of the driving current, and after the processing module 103 obtains the driving current, the driving current is converted into a voltage as an input voltage of the processing module 103 and compared with the preset voltage. The processing module 103 controls the driving module 101 to supply the first voltage or the second voltage to the driving element 102 according to the comparison result. When the input voltage is less than or equal to the preset voltage, the processing module 103 controls the driving module 101 to provide the driving element 102 with the data voltage as the driving voltage, and when the input voltage is greater than the preset voltage, the processing module 103 controls the driving module 101 to provide the driving element 102 with the sum of the data voltage and the threshold voltage as the driving voltage.
In an embodiment of the application, when the input voltage is less than or equal to the preset voltage, the processing module 103 is specifically configured to control the driving module 101 to operate according to a first working timing, and when the driving module 101 operates according to the first working timing, the driving module 101 provides the driving voltage to the driving element 102 through the first pole of the driving element 102 as the first voltage. When the input voltage is greater than the preset voltage, the processing module 103 is specifically configured to control the driving module 101 to operate according to the second operation timing, and when the driving module 101 operates according to the second operation timing, the driving module 101 provides the driving voltage to the driving element 102 through the first pole of the driving element 102 as the second voltage.
Specifically, referring to fig. 2, the first working timing is a variation curve of the first scan signal of the driving module 101 in one period, and the first working timing includes a plurality of same periods. Referring to fig. 3, the second operation timing is a variation curve of the first scan signal and the second scan signal of the driving module 101 in one period, and the second operation timing includes a plurality of same periods. In the first operation sequence, the first scan signal controls the driving module 101 to output the data voltage to the first pole of the driving element 102, and in the second operation sequence, the first scan signal and the second scan signal controls the driving module 101 to output the sum of the data voltage and the threshold voltage to the first pole of the driving element 102, so as to compensate the threshold voltage offset of the driving element 102.
In an embodiment of the present application, the processing module 103 may be implemented by a processor or a controller, where the processor is configured with a first mode and a second mode, the first mode corresponds to a first working timing, the second mode corresponds to a second working timing, and the processor or the controller selects the first working timing corresponding to the first mode to control the driving module to work if it determines that the driving current/the input voltage obtained according to the driving current is less than or equal to a preset current threshold/a preset voltage. And if the processor or the controller determines that the driving current/the input voltage obtained according to the driving current is greater than the preset current threshold/the preset voltage, selecting a second working time sequence corresponding to the second mode to control the driving module to work.
In another embodiment of the present application, as shown in fig. 4, the processing module 103 includes a conversion device 1031, a comparison circuit 1032, and a selection circuit 1033. Wherein the converting device 1031 is connected to the third pole of the driving element and to one input of the comparing circuit. The conversion device 1031 is used to convert the driving current into an input voltage of the comparison circuit 1032. One input of the comparison circuit 1032 is connected to the conversion device 1031, the other input of the comparison circuit 1032 is connected to the preset voltage, the output of the comparison circuit 1032 is connected to the selection circuit 1033, and the comparison circuit 1032 is configured to output a first trigger signal to the selection circuit 1033 when the input voltage is less than or equal to the preset voltage, and the first trigger signal is configured to trigger the selection circuit 1033 to select the first mode. The comparison circuit 1032 is configured to output a second trigger signal to the selection circuit 1033 in case the input voltage is greater than the preset voltage, the second trigger signal being configured to trigger the selection circuit 1033 to select the second mode. The first mode corresponds to a first operating sequence, and the second mode corresponds to a second operating sequence. The selection circuit 1033 is configured to control the driving module 101 to operate according to a first working timing sequence to provide the first voltage to the driving element 102 through the first pole of the driving element 102 according to the first trigger signal, or to control the driving module 101 to operate according to a second working timing sequence to provide the second voltage to the driving element 102 through the first pole of the driving element 102 according to the second trigger signal.
Specifically, as shown in fig. 5, taking the driving element 102 as the third field effect transistor T3, the load 105 as the OLED, the conversion device 1031 as the resistor R1, the comparison circuit 1032 as the comparison operational amplifier U1, and the selection circuit 1033 as the data selector U2 as an example, as shown in fig. 5, the first end of the resistor R1 is connected to the source of the third field effect transistor, and the second end is grounded. The positive phase input end of the comparison operational amplifier U1 is connected with the first end of the resistor R1, the negative phase input end of the comparison operational amplifier U1 is connected with the preset voltage Vref, the positive pole of the comparison operational amplifier U1 is connected with the 3.3V voltage source, the negative pole is grounded, and the output end is connected with the input end of the data selector U2. When the driving current flows from the source of the third fet T3 to the resistor R1, since the second terminal of the resistor R1 is grounded, a voltage difference, i.e., an input voltage, is generated between the two terminals of the resistor R1, so as to achieve the purpose of converting the driving current into the input voltage by the R1 and transmitting the input voltage to the non-inverting input terminal of the comparator U1. When the input voltage is less than or equal to the preset voltage Vref, the comparing operational amplifier U1 outputs a first trigger signal. For example, the first trigger signal may be a low-level signal, the data selector U2 receives the low-level signal and selects the first MODE1, and in the first MODE1, the driving module 101 provides a driving voltage, i.e., the data voltage Vdata, to the gate of the third field effect transistor T3 according to the first operation sequence. When the input voltage is greater than the preset voltage Vref, the comparing and amplifying device U1 outputs a second trigger signal, the second trigger signal is a high-level signal, the data selector U2 receives the high-level signal and selects the second MODE2, and in the second MODE2, the driving module 101 provides a driving voltage, i.e., the sum of the data voltage Vdata and the threshold voltage Vth, to the gate of the third field-effect transistor T3 according to the second working timing, so as to achieve threshold compensation for the third field-effect transistor T3.
In one embodiment of the present application, the driving module 101 includes a first switching device 1011 and a compensation circuit 1012, and referring to fig. 5 and 6, a first pole of the first switching device 1011 is connected to the processing module 103, a second pole of the first switching device 1011 is connected to the DATA line DATA, and a third pole of the first switching device 1011 is connected to the first pole of the driving element 102. A first terminal of the compensation circuit 1012 is connected to the first pole of the driving element 102, and a second terminal of the compensation circuit 1012 is grounded. The first operation sequence includes a plurality of cycles, the cycles include a first time period and a second time period in time sequence, in the first time period of each cycle, the first switching device 1011 is turned on, and the compensation circuit 1012 is configured to store electric energy by using the data voltage. During a second period of each cycle, the first switching device 1011 is turned off and the compensation circuit 1012 is used to discharge the stored energy during the first period to provide the first voltage to the first pole of the driving element 102.
In one possible embodiment of the present application, the switching device may be a field effect transistor, and taking the switching device as the field effect transistor as an example, a first pole of the switching device in this embodiment of the present application is a gate of the field effect transistor, a second pole of the switching device is a drain of the field effect transistor, and a third pole of the switching device is a source of the field effect transistor, which are described in a unified manner herein and will not be described in detail later.
As an example, the first switching device 1011 is a first field effect transistor T1, the gate of the first field effect transistor T1 is connected to the processing module 103, and the first SCAN signal SCAN1 controls the first field effect transistor T1 to be turned on and off. The compensation circuit 1012 is connected to the processing module 103, and the second SCAN signal SCAN2 controls the operation of the compensation circuit 1012. When the driving module 101 is in the first MODE1, according to the first working timing, in the first time period of each cycle, the first SCAN signal SCAN1 is a high level signal, the first field effect transistor T1 is turned on, the compensation circuit 1012 stores electric energy, in the second time period, the first SCAN signal SCAN1 changes to a low level signal, the first field effect transistor T1 is turned off, and the compensation circuit 1012 releases electric energy to the gate of the third field effect transistor T3, that is, the driving element 102 is turned on to make the OLED emit light.
In an embodiment of the present application, the selection circuit 1033 is specifically configured to output a first level signal to the first switching device 1011 during a first time period of each cycle included in the first operation timing, and output a second level signal to the first switching device 1011 during a second time period of each cycle, according to the first trigger signal, the first level signal being used to trigger the first switching device 1011 to be turned on, and the second level signal being used to trigger the first switching device 1011 to be turned off.
As shown in fig. 2, taking a cycle as an example in fig. 2, phase 1 in the cycle corresponds to a first time period, and phase 2 corresponds to a second time period, wherein phase 1 can be regarded as a charging phase, at this time, as shown in fig. 5, the first field effect transistor T1 is turned on, since the second field effect transistor T2 is turned off, at this time, the data voltage received by the first field effect transistor T1 acts on both ends of the capacitor C1, the capacitor C1 starts to charge, that is, the voltage of the electric energy stored in the capacitor C1 is finally the data voltage, at phase 2 (a lighting phase), the first field effect transistor T1 is turned off, since at this time, the second field effect transistor T2 is still turned off, the driving voltage of the third field effect transistor T3 is provided by the capacitor C1, in other words, at phase 2, the capacitor C1 discharges the electric energy stored at the phase of the first field effect transistor T1 to provide the driving voltage to the third field effect transistor T3, the third field effect transistor T3 can drive the OLED to emit light, and the driving voltage is the data voltage.
As shown in fig. 2, the first level signal is a high level signal for controlling the first fet T1 to be turned on, and the second level signal is a low level signal for controlling the first fet T1 to be turned off. The data selector U2 controls the variation curve of the first SCAN signal SCAN1 at the first operation timing according to the first trigger signal, i.e., the low signal sent by the comparator U1. During the first period of each cycle, the data selector U2 controls the first SCAN signal SCAN1 to be a high level signal and the first field effect transistor T1 to be turned on, and during the second period of each cycle, the data selector U2 controls the first SCAN signal SCAN1 to be a low level signal and the first field effect transistor T1 to be turned off.
In one embodiment of the present application, the compensation circuit 1012 includes: a second switching device and an energy storage element. The second pole of the second switching device and the first end of the energy storage element are connected to the first pole of the driving element 102, the third pole of the second switching device and the second end of the energy storage element are commonly grounded, and the first pole of the second switching device is connected to the processing module 103. In a first period of each cycle, the second switching device is turned off, and the energy storage element is used for converting the data voltage input to the energy storage element into electric energy. During a second time period of each cycle, the second switching device is open and the energy storage element is used to discharge electrical energy to provide the first voltage to the first pole of the driving element 102.
As an example, referring to fig. 5, the second switching device is a second field effect transistor T2, and the energy storage element is a capacitor C1. In the first MODE1, in each cycle of the first operation sequence, the second field effect transistor is in the off state for both the first period and the second period.
In one embodiment of the present application, the driving module 101 includes a first switch device 1011 and a compensation circuit 1012, a first pole of the first switch device 1011 is connected to the processing module 103, a second pole of the first switch device 1011 is connected to the DATA line DATA, a third pole of the switch device is connected to the first pole of the driving element 102, a first terminal of the compensation circuit 1012 is connected to the first pole of the driving element 102, and a second terminal of the compensation circuit 1012 is connected to the ground. The second working sequence comprises one or more cycles, and the cycles at least comprise a fifth time period and a sixth time period according to the time sequence. During a fifth period of each cycle, the first switching device 1011 is turned on, and the compensation circuit 1012 is used to store electric energy by using the data voltage so that the voltage stored by the compensation circuit 1012 is equal to the threshold voltage and the data voltage. During a sixth time period of each cycle, the second switching device is open and the compensation circuit 1012 is operable to discharge the stored electrical energy during the fifth time period to provide the second voltage to the first pole of the driving element 102.
Optionally, the cycle further includes a third time period and a fourth time period before the fifth time period according to the time sequence, in the third time period of each cycle, the first switching device 1011 is turned on, and the compensation circuit 1012 stores the electric energy by using the data voltage. During the fourth period of each cycle, the first switching device 1011 is turned off and the compensation circuit 1012 is used to discharge a portion of the power, so that the voltage stored by the compensation circuit 1012 is equal to the threshold voltage.
As an example, the first SCAN signal SCAN1 controls the first field effect transistor T1 to be turned on and off, the gate of the second field effect transistor T2 is connected to the processing module 103, and the second SCAN signal SCAN2 controls the second field effect transistor T2 to be turned on and off. When the driving module 101 is in the second MODE2, according to the second working timing, in the third time period of each cycle, the first SCAN signal SCAN1 is a high level signal, the second SCAN signal SCAN2 is a low level signal, the first field effect transistor T1 is turned on, the capacitor C1 stores electric energy, and the second field effect transistor T2 is turned off. During the fourth period, the first SCAN signal SCAN1 changes to a low level signal, the second SCAN signal SCAN2 changes to a high level signal, the first fet T1 turns off, the second fet T2 turns on, and the capacitor C1 discharges a portion of the power, so that the voltage stored in the capacitor C1 is equal to the threshold voltage. In the fifth period, the first SCAN signal SCAN1 changes to a high level signal, the second SCAN signal SCAN2 changes to a low level signal, the first field effect transistor T1 is turned on, the second field effect transistor T2 is turned off, and the capacitor C1 is charged, so that the voltage stored in the capacitor C1 is equal to the sum of the threshold voltage Vth and the data voltage Vdata. In the sixth time period, the first SCAN signal SCAN1 changes to a low level signal, the second SCAN signal SCAN2 is a low level signal, the first field effect transistor T1 is turned off, the second field effect transistor T2 is turned off, and the capacitor C1 discharges power to the gate of the third field effect transistor T3, i.e., the driving element 102 is turned on to make the OLED emit light.
In one embodiment of the present application, the compensation circuit 1012 comprises at least a second switching device and an energy storage element, a second pole of the second switching device is connected to the first pole of the driving element 102, a third pole of the second switching device and a second end of the energy storage element are commonly grounded, and the first pole of the second switching device is connected to the processing module 103. The selection circuit 1033 is specifically configured to output a first level signal to the first switching device 1011 in the third period and the fifth period of each cycle. During the fourth period and the sixth period of each cycle, the second level signal is output to the first switching device 1011. The first level signal is output to the second switching device during a fourth time period of each cycle, and the second level signal is output to the second switching device during a third time period, a fifth time period, and a sixth time period of each cycle. The first level signal is used for triggering the switch device to be switched on, and the second level signal is used for triggering the switch device to be switched off.
Specifically, the first level signal is a high level signal for controlling the first field effect transistor T1 and the second field effect transistor T2 to be turned on. The second level signal is a low level signal for controlling the first field effect transistor T1 and the second field effect transistor T2 to turn off.
The embodiment of the present application provides a driving apparatus, which includes a driving element 102 and the driving circuit described above. The first pole of the driving element 102 is connected to the driving module 101, the third pole of the driving element 102 is connected to the processing module 103 and the load 105, and the second pole of the driving element 102 is connected to the power source 104.
The embodiment of the application provides a display device, which comprises the driving device, a display panel and a light-emitting device. The display panel includes a common electrode. The display device is composed of a plurality of driving circuits and light-emitting devices, wherein the plurality of driving circuits drive the light-emitting devices to emit light, and the driving circuits and the light-emitting devices are connected with a display panel through common electrodes to form the display device.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A driver circuit, characterized in that the driver circuit comprises: the driving module is also connected with a first pole of a driving element, a third pole of the driving element is connected with a load and the processing module, a second pole of the driving element is connected with a power supply, and the driving module is at least used for providing driving voltage for the first pole of the driving element and compensating threshold voltage of the first pole;
the processing module is configured to obtain a value of a driving current output by the driving element from the third pole under driving of the driving module, and to control the driving module to provide the driving voltage to the driving element through the first pole of the driving element according to the value of the driving current, where the driving voltage is a first voltage or a second voltage, the first voltage is a data voltage input to the driving module, and the second voltage includes the data voltage and the threshold voltage.
2. The driving circuit according to claim 1, wherein the processing module is specifically configured to determine an input voltage according to a value of the driving current, and to control the driving module to provide the driving voltage to the driving element through the first pole to be the first voltage if the input voltage is less than or equal to a preset voltage, and to control the driving module to provide the driving voltage to the driving element through the first pole to be the second voltage if the input voltage is greater than the preset voltage.
3. The driving circuit according to claim 2, wherein the processing module is specifically configured to control the driving module to operate according to a first operation timing when the input voltage is less than or equal to a preset voltage, and when the driving module operates according to the first operation timing, the driving module supplies the driving voltage to the driving element through the first pole as the first voltage;
and when the input voltage is greater than the preset voltage, the processing module is specifically configured to control the driving module to operate according to a second working timing sequence, and when the driving module operates according to the second working timing sequence, the driving module supplies the driving voltage to the driving element through the first pole as the second voltage.
4. The driving circuit according to any one of claims 1 to 3, wherein the processing module comprises a conversion device, a comparison circuit and a selection circuit;
the conversion device is used for converting the driving current into an input voltage of the comparison circuit, and the input voltage is determined according to the driving current;
the comparison circuit is used for outputting a first trigger signal when the input voltage is less than or equal to a preset voltage, the first trigger signal is used for triggering the selection circuit to select a first mode, and outputting a second trigger signal when the input voltage is greater than the preset voltage, the second trigger signal is used for triggering the selection circuit to select a second mode, the first mode corresponds to a first working time sequence, and the second mode corresponds to a second working time sequence,
the selection circuit is configured to control the driving module to operate according to the first working timing sequence to provide the first voltage to the driving element through the first pole according to the first trigger signal, or control the driving module to operate according to the second working timing sequence to provide the second voltage to the driving element through the first pole according to the second trigger signal.
5. The driving circuit according to claim 4, wherein the driving module comprises a first switching device and a compensation circuit, a first pole of the first switching device is connected with the processing module, a second pole of the first switching device is connected with a data line, a third pole of the switching device is connected with the first pole of the driving element, a first end of the compensation circuit is connected with the first pole of the driving element, and a second end of the compensation circuit is grounded;
the first working time sequence comprises a plurality of cycles, the cycles comprise a first time period and a second time period according to the time sequence,
during a first period of each of the cycles, the first switching device is turned on, and the compensation circuit is used for storing electric energy by using the data voltage;
during a second time period of each of the cycles, the first switching device is open, and the compensation circuit is configured to discharge the electrical energy stored during the first time period to provide the first voltage to the first pole of the driving element.
6. The driving circuit according to claim 5, wherein the selection circuit is specifically configured to output a first level signal to the first switching device in a first time period of each cycle included in the first operation timing according to the first trigger signal, and output a second level signal to the first switching device in a second time period of each cycle, the first level signal being used to trigger the first switching device to be turned on, and the second level signal being used to trigger the first switching device to be turned off.
7. The drive circuit according to claim 5 or 6, wherein the compensation circuit comprises: a second switch device and an energy storage element, wherein a second pole of the second switch device and a first end of the energy storage element are connected to the first pole of the driving element, a third pole of the second switch device and a second end of the energy storage element are commonly grounded, and the first pole of the second switch device is connected to the processing module,
during a first time period of each cycle, the second switching device is turned off, and the energy storage element is used for converting the data voltage input to the energy storage element into electric energy;
during a second time period of each of the cycles, the second switching device is open and the energy storage element is configured to discharge the electrical energy to provide the first voltage to the first pole of the driving element.
8. The driving circuit according to claim 4, wherein the driving module comprises a first switching device and a compensation circuit, the compensation circuit comprises a second switching device and an energy storage element, a first pole of the first switching device is connected with the processing module, a second pole of the first switching device is connected with a data line, a third pole of the switching device is connected with the first pole of the driving element, a first pole of the second switching device is connected with the processing module, a second pole of the first switching device is connected with the first pole of the driving element, and a third pole of the switching device is grounded;
the second working time sequence comprises one or more cycles, and the cycles comprise a third time period, a fourth time period, a fifth time period and a sixth time period according to the time sequence;
during a third period of each of the cycles, the first switching device is turned on and the second switching device is turned off, and the compensation circuit is configured to store electrical energy using the data voltage;
during a fourth time period of each of said cycles, said first switching device is off and said second switching device is on, said compensation circuit for discharging a portion of said electrical energy such that said voltage stored by said compensation circuit equals said threshold voltage;
during a fifth time period of each of the cycles, the first switching device is turned on and the second switching device is turned off, and the compensation circuit is configured to store electrical energy using the data voltage such that the voltage stored by the compensation circuit is equal to the sum of the threshold voltage and the data voltage;
during a sixth time period of each of the cycles, the first switching device is open, the second switching device is open, and the compensation circuit is configured to discharge the stored electrical energy during the fifth time period to provide the second voltage to the first pole of the driving element.
9. A driving device, comprising a driving element and the driving circuit according to any one of claims 1 to 8, wherein a first pole of the driving element is connected to the driving module, a third pole of the driving element is connected to the processing module and the load, and a second pole of the driving element is connected to the power source.
10. A display device characterized in that it comprises a driving device according to claim 9.
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