CN111354300A - Driving circuit, driving method and display device - Google Patents
Driving circuit, driving method and display device Download PDFInfo
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- CN111354300A CN111354300A CN201910749919.3A CN201910749919A CN111354300A CN 111354300 A CN111354300 A CN 111354300A CN 201910749919 A CN201910749919 A CN 201910749919A CN 111354300 A CN111354300 A CN 111354300A
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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]
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3607—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 by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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Abstract
The embodiment of the application belongs to the technical field of driving, and provides a driving circuit, a driving method and a display device, wherein the driving circuit comprises a register module and a current channel module, the current channel module comprises a plurality of current channel units, the register module generates a group of switch control signals for each current channel unit based on the data signals, and controls a plurality of sub-current driving signals output by the current driving signal sources in each current channel unit through a plurality of sub-switch control signals in each group of switch control signals, so that the current magnitude of the current driving signals output by the current channel units is controlled, the aim of accurately controlling the gray scale of a light-emitting unit in the display module is fulfilled, the problem that an external current driver is needed in the existing current driving mode is solved, and a corresponding driving circuit unit needs to be designed in a display panel is solved, greatly restricting the application range of the display panel.
Description
Technical Field
The embodiment of the application belongs to the technical field of driving, and particularly relates to a driving circuit, a driving method and a display device.
Background
With the development of technology, more and more electronic devices are equipped with display screens. Currently, the mainstream display technologies can be divided into two major categories, namely liquid crystal backlight technologies and direct display technologies. In both the direct-type dynamic backlight display technology and the direct display technology, light emitting diodes are generally used as light emitting elements to form a display array, and the gray scale of the light emitting diodes is adjusted by controlling the operating current of the light emitting diodes through a driving circuit. Compared with other driving modes, the actively-driven display array has the advantages of low peak current and high energy efficiency, the current common active driving mode comprises time pulse width modulation, voltage modulation, current modulation and the like, the time pulse width modulation adopting the active driving has higher requirements on the operating frequency of a system, the gray scale control precision adopting the voltage modulation is greatly influenced by voltage fluctuation and device performance fluctuation, a large amount of compensation and adjustment needs to be carried out on driving signals, the driving circuit structure is complex, the current driving mode needs to be externally connected with a current driver, and a corresponding driving circuit unit needs to be designed in a display panel, the application range of the display panel is greatly restricted, and the gray scale control precision is not high enough.
Disclosure of Invention
Embodiments of the present application provide a driving circuit and a display device, which aim to solve at least one of the above problems.
The embodiment of the present application provides a driving circuit, the driving circuit includes: the register module receives an external data signal and generates a group of switch control signals for each current channel unit based on the data signal;
each current channel unit comprises a plurality of current driving signal sources, each group of switch control signals comprises a plurality of sub-switch control signals, the plurality of sub-switch control signals are respectively in one-to-one correspondence with the plurality of current driving signal sources, each current driving signal source generates a sub-current driving signal, and the current magnitude of the current driving signal output by the current channel unit is controlled based on the corresponding sub-switch control signal.
Optionally, the current channel module further includes: the reference signal source outputs a reference current signal based on external voltage; each current driving signal source is connected with the reference signal source, generates the sub-current driving signal based on the reference current signal and a preset current parameter, and controls the output of the sub-current driving signal according to the received sub-switch control signal.
Optionally, the current driving signal source includes a current gain unit connected to the reference signal source and a switch unit connected to the current gain unit;
the current gain unit and the reference signal source form a current mirror, and generate corresponding sub-current driving signals based on the reference current signal and preset current parameters;
the switching unit controls output of the sub current driving signal based on the sub switch control signal.
Optionally, each of the current channel units includes a sub-reference signal source, and a plurality of current driving signal sources in each of the current channel units are connected to the sub-reference signal source, where the current driving signal source includes a current gain unit connected to the reference signal source and a switch unit connected to the current gain unit, and each of the current gain units forms a current mirror with the sub-reference signal source;
the sub-reference signal source generates a sub-reference current signal based on an external sub-reference voltage, the plurality of current driving signal sources in each current channel unit respectively generate a plurality of sub-current driving signals with different current magnitudes based on the sub-reference current signal and a preset current parameter, and the output of the sub-current driving signals is controlled according to the received sub-switch control signals.
Optionally, each of said currentsA plurality of current driving signal sources in the channel unit respectively generate a plurality of sub-current driving signals with different current magnitudes based on the sub-reference current signals and preset current parameters, and the method comprises the following steps: the current of the sub-current drive signal output by the ith current drive signal source is 2 of the sub-reference current signaliMultiple, i is more than or equal to 1 and i is an integer.
Optionally, the sub-reference signal source includes a first MOS transistor and a current-limiting resistor; the first end of the first MOS tube is externally connected with a working voltage signal, the first end of the current-limiting resistor is externally connected with a reference voltage signal, the second end of the first MOS tube, the second end of the current-limiting resistor and the third end of the first MOS tube are connected in common, and a corresponding reference current signal is output based on the reference voltage signal.
Optionally, each current gain unit includes a second MOS transistor, a first end of the second MOS transistor is externally connected to a working voltage signal, a second end of the second MOS transistor is connected to the switch unit, and a third end of the second MOS transistor is connected to a third end of the first MOS transistor.
Optionally, each switch unit includes a third MOS transistor, a first end of the third MOS transistor is connected to the current gain unit, a second end of the third MOS transistor is connected to an output end of the current channel unit, and a third end of the third MOS transistor is connected to the register module.
Optionally, the register module includes a plurality of register units, and each register unit generates a set of corresponding switch control signals for a corresponding one of the current channel units based on the data signal.
The embodiment of the present application further provides a driving method, which is applied to the driving circuit described in any one of the above, where the driving method includes:
receiving a data signal through the register module, and generating a group of switch control signals for each current channel unit based on the data signal;
and controlling the current magnitude of the current driving signal output by the current channel unit according to the switch control signal.
Optionally, a current value of the sub-current driving signal generated by the kth current driving signal source in the current channel unit is 2 of a current value of the sub-current driving signal generated by the 1 st current driving signal sourcek-1Multiple, wherein k is more than or equal to 2 and is an integer;
the controlling the current magnitude of the current driving signal output by the current channel unit according to the switch control signal includes: and a plurality of current driving signal sources in each current channel unit respectively output sub-current driving signals according to a plurality of corresponding sub-switch control signals.
An embodiment of the present application further provides a display device, including:
the display module comprises a plurality of light-emitting units; and
the driving circuit according to any one of the above claims, wherein the driving circuit is electrically connected to the display module, and generates a corresponding current driving signal according to the received data signal to drive the display module to display the display image.
Optionally, each of the light emitting units is correspondingly connected to one of the current channel units.
Optionally, the light emitting unit includes: a light emitting chip; and the active driving circuit is connected with the light-emitting chip and drives the light-emitting chip to display corresponding brightness based on the received scanning signal and the current driving signal output by the driving circuit.
Optionally, the active driving circuit includes: the circuit comprises a capacitor, a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a current driving signal input end and a scanning signal input end; the first end of the first switch unit is connected with the light-emitting chip, the first end of the third switch unit, the first end of the fourth switch unit and the current driving signal input end are connected in common, the second end of the third switch unit is connected with the first end of the second switch unit, the second end of the first switch unit, the first end of the second switch unit and the first end of the capacitor are connected to the ground in common, the second end of the fourth switch unit, the second end of the capacitor, the third end of the first switch unit and the third end of the second switch unit are connected in common, and the third end of the third switch unit, the third end of the fourth switch unit and the scanning signal input end are connected in common.
The embodiment of the application provides a driving circuit, a driving method and a display device, the driving circuit comprises a register module and a current channel module, the current channel module comprises a plurality of current channel units, the register module generates a set of switch control signals for each current channel unit based on the data signals, a plurality of sub-switch control signals in each set of switch control signals control a plurality of sub-current driving signals output by the current driving signal source in each current channel unit, thereby realizing the control of the current magnitude of the current driving signals output by the current channel units, achieving the purpose of accurately controlling the gray scale of the light emitting units in the display module, solving the problems that the existing current driving mode needs an external current driver and needs to design a corresponding driving circuit unit in a display panel, greatly restricting the application range of the display panel.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a driving circuit provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;
fig. 3 is a driving circuit of a driving circuit provided in another embodiment of the present application;
fig. 4 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;
fig. 5 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;
fig. 6 is a schematic structural diagram of a current channel module according to an embodiment of the present disclosure;
FIG. 7 is a schematic structural diagram of a current path unit according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a driving circuit according to another embodiment of the present application;
FIG. 10 is a schematic diagram of an active matrix display array according to an embodiment of the present application;
fig. 11 is a schematic structural diagram of an active driving circuit according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the drawings described above, are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
The discrete electronic component in the embodiment of the present application refers to an electronic component that functions as an independent circuit and constitutes a basic unit of a circuit, for example, a resistor, a capacitor, an inductor, an electromechanical element (a connector, a switch, a relay, or the like), an electroacoustic device, an optoelectronic device, a sensitive component, a display device, a piezoelectric device, or the like.
Referring to fig. 1, an embodiment of the present application provides a driving circuit, including: the register module receives an external data signal and generates a group of switch control signals for each current channel unit based on the data signal; each current channel unit comprises a plurality of current driving signal sources, each group of switch control signals comprises a plurality of sub-switch control signals, the plurality of sub-switch control signals are respectively in one-to-one correspondence with the plurality of current driving signal sources, each current driving signal source generates a sub-current driving signal, and the current magnitude of the current driving signal output by the current channel unit is controlled based on the corresponding sub-switch control signal.
In this embodiment, the current channel module includes a plurality of current channel units, the register module receives external data signals, and generating a set of switch control signals for each current channel unit based on the data signals, each current channel unit comprising a plurality of current driving signal sources, each current driving signal source generating a sub-current driving signal, the plurality of sub-switch control signals respectively controlling the on or off of the plurality of current driving signal sources, the output terminals of the plurality of current driving signal sources being connected in common, used for outputting a current driving signal, the current magnitude of the current driving signal is the sum of the currents of the sub-current driving signals output by the plurality of driving signal sources, therefore, the current channel module controls the current magnitude of the current driving signal output by the current channel unit based on the corresponding sub-switch control signal.
In one embodiment, the driving circuit is connected to the display module, the display module includes N light emitting units, N is greater than or equal to 2 and N is an integer, the N light emitting units are sequentially arranged to form a display array, the driving circuit drives each light emitting unit to light by outputting different current driving signals and controls a gray scale of each light emitting unit, specifically, the register module receives a data signal and converts the data signal into N sets of switching control signals, the N sets of switching control signals are in one-to-one correspondence with the N current channel units, and each set of switching control signals is used for controlling a conduction state of the current channel unit corresponding to the switching control signal so as to adjust the current driving signal output by the current channel unit. Specifically, the conduction state of the current channel unit may be the magnitude of the output current thereof, for example, the current channel unit includes a plurality of current driving signal sources connected in parallel, the current output by each current driving signal source is different, and the conduction and the turn-off of the plurality of current driving signal sources in the current channel unit are controlled by a set of switch control signals, so as to adjust the total current output by the plurality of current driving signal sources, wherein the total current output by the plurality of current driving signal sources is the current driving signal output by the current channel unit, thereby achieving the purpose of adjusting the current driving signal output by the current channel unit.
In an embodiment, the current channel unit in this embodiment may further include a plurality of current adjusting switches, each current adjusting switch may output a corresponding current signal according to the received control signal, for example, each current adjusting switch may be an adjustable resistor, the adjustable resistor may output a corresponding current signal according to the received control signal, and the plurality of current adjusting switches in the current channel unit are adjusted by a set of switch control signals, so as to adjust a total current output by the plurality of current adjusting switches, where the total current output by the plurality of current adjusting switches is a current driving signal output by the current channel unit, so as to achieve an aim of adjusting the current driving signal output by the current channel unit.
In one embodiment, as shown in fig. 2, each current channel cell includes K parallel current drive signal sources, K being equal to or greater than 2, and K is an integer, each current driving signal source can generate a sub-current driving signal, each set of switch control signals output by the register module includes K switch control signals, the K switch control signals are matched with the K current driving signal sources in a one-to-one correspondence manner, each current driving signal source can control the on and off of the sub-current driving signal output by the current driving signal source according to the corresponding switch control signal, for example, if the switch control signal received by the current driving signal source is a high level, the current driving signal source outputs a sub-current driving signal, and if the switch control signal received by the current driving signal source is at a low level, the current driving signal source turns off the output sub-current driving signal.
In one embodiment, referring to fig. 3, the current channel module further includes: the reference signal source outputs a reference current signal based on external voltage; each current driving signal source is connected with the reference signal source, generates the sub-current driving signal based on the reference current signal and a preset current parameter, and controls the output of the sub-current driving signal according to the received sub-switch control signal.
In this embodiment, the reference signal source is configured to generate a corresponding reference current signal according to the external voltage, where the reference current signal is configured to provide a reference current for each current driving signal source, for example, each current driving signal source may be set as a current amplifying circuit, and amplify the reference current signal, and the current amplifying circuit may set different amplification factors, for example, the amplification factors of the plurality of current driving signal sources are in an equal ratio series or an equal difference series, so that the magnitude of the current driving signal output by each current driving signal source may be adjusted by adjusting the magnitude of the reference voltage signal.
In an embodiment, the magnitude of the sub-current driving signals generated by each current driving signal source may be the same, at this time, the amplification factor of each current driving signal source to the reference current signal is also the same, and the on and off of each current driving signal source is controlled by the K switch control signals, so that the luminance of K +1 gray scales can be obtained.
In one embodiment, the magnitude of the sub-current driving signal generated by each current driving signal source may be different, for example, if the current of the reference current signal is Iref; the current of the current driving signal outputted by the ith current driving signal source can be set to Iref 2iI is more than or equal to 1 and less than or equal to K, and at the moment, the on-off of each current drive signal source is controlled by K switch control signals, so that 2 can be obtainedK+1-1 gray level of brightness.
In one embodiment, each of the current driving signal sources is formed by a current gain unit and a switching unit connected in series; the current gain unit and a reference signal source form a current mirror, the current gain unit generates corresponding sub-current driving signals based on the reference current signals and preset current parameters, and the switch unit controls the output of the sub-current driving signals based on the sub-switch control signals.
In this embodiment, the current gain unit amplifies the reference current signal and outputs a corresponding sub-current driving signal, the switch unit controls on and off of the sub-current driving signal according to the received switch control signal, and the K switch control signals in each set of switch control signals control on and off of the K current driving signal sources in the corresponding current channel unit, so as to adjust the current magnitude of the current driving signal output by the current channel unit.
In an embodiment, the current gain unit may employ an electronic switching tube to amplify the reference current signal, where the electronic switching tube may be a triode or a field effect transistor, and specifically, a user may select a device employed by the current gain unit in each current driving signal source according to a requirement.
In one embodiment, referring to fig. 4, each of the current channel units includes a sub-reference signal source, and a plurality of current driving signal sources in each of the current channel units are connected to the sub-reference signal source, where the current driving signal source includes a current gain unit connected to the reference signal source and a switch unit connected to the current gain unit, and each of the current gain units forms a current mirror with the sub-reference signal source; the sub-reference signal source generates a sub-reference current signal based on an external sub-reference voltage, the plurality of current driving signal sources in each current channel unit respectively generate a plurality of sub-current driving signals with different current magnitudes based on the sub-reference current signal and a preset current parameter, and the output of the sub-current driving signals is controlled according to the received sub-switch control signals.
In this embodiment, each current channel unit may include a sub-reference signal source, and the sub-reference signal source may output a corresponding sub-reference current signal according to the received sub-reference voltage signal, and at this time, each current driving signal source in the current channel unit may amplify the sub-reference current signal to generate a corresponding sub-current driving signal, and at the same time, the current driving signal source also controls the on and off of the sub-current driving signal according to the corresponding switch control signal, by arranging a sub-reference signal source in each current channel unit, the gray scale of each light-emitting unit can be controlled by adjusting the magnitude of the sub-reference current signal, and if the display module is provided with N light-emitting units, N sub-reference signal sources are required to be arranged to output N corresponding reference voltage signals.
In one embodiment, the register module comprises a plurality of register units, and each register unit generates a set of corresponding switch control signals for a corresponding one of the current channel units based on the data signal.
In one embodiment, referring to fig. 5, the register module includes N register units, and each register unit outputs a corresponding switch control signal according to the data signal.
In this embodiment, the N register units in the register module are used for receiving the data signals and outputting the corresponding switch control signals according to the data signals, the channel signals are the N sets of switch control signals output by the register module, wherein each register unit is provided with K signal output ends for outputting K switch control signals, the K switch control signals are correspondingly matched with the K current driving signal sources in the corresponding current channel units, specifically, N register units can be connected in series in sequence, at the moment, the N register units share one shift signal, optionally, N register units may also be connected in parallel, in which case, the N register units respectively use independent shift signals, optionally, the N register units may be grouped and connected in series to form a plurality of series groups, and then the plurality of series groups are connected in parallel.
In one embodiment, the generating a plurality of sub-current driving signals with different current magnitudes by a plurality of current driving signal sources in each current channel unit based on the sub-reference current signal and a preset current parameter respectively includes: the current of the sub-current drive signal output by the ith current drive signal source is 2 of the sub-reference current signaliMultiple, i is more than or equal to 1 and i is an integer.
In one embodiment, the current of the sub-current driving signal output by the ith current driving signal source in each current channel unit is set to be 2 of the sub-reference current signaliThe current magnitude relation of the two is 1:1:2:4: … …:2KThereby forming K paths of sub-current driving signals, controlling the on and off of the K paths of sub-current driving signals and realizing that the current of the current driving signals output by the current channel unit is from 1 time of reference current to 2 times of reference currentK+1-continuous adjustment of 1 time reference current, controlling on and off by the switch control signal output by the register unit, selecting the current magnitude of the current driving signal output by the current channel unit, and driving the corresponding light emitting unit to display 2 at mostK+1-1 gray-scale brightness.
In one embodiment, the sub-reference signal source comprises a first MOS tube and a current-limiting resistor; the first end of the first MOS tube is externally connected with a working voltage signal, the first end of the current-limiting resistor is externally connected with a reference voltage signal, the second end of the first MOS tube, the second end of the current-limiting resistor and the third end of the first MOS tube are connected in common, and a corresponding reference current signal is output based on the reference voltage signal.
In one embodiment, referring to fig. 6, each register unit receives data signals, and each register unit is provided with K signal output terminals to output K switching control signals, and the electronic switching transistor MOS10 and the reference resistor Rref form a reference signal source, where the electronic switching transistor MOS10 is used as a first MOS transistor, specifically, a first terminal of the electronic switching transistor MOS10 is connected to the operating voltage source V0, a second terminal of the electronic switching transistor MOS10, a third terminal of the electronic switching transistor MOS10, and a first terminal of the reference resistor Rref are connected in common and used for outputting a reference current signal, and a second terminal of the reference resistor Rref is used for receiving a reference voltage signal, and in this embodiment, the magnitude of the reference current signal output by the sub-reference voltage unit can be adjusted by adjusting the reference voltage signal or the reference resistor Rref.
In one embodiment, the electronic switching device MOS10 may be a P-type MOS transistor, which forms a current on the reference resistor Rref when the P-type MOS transistor is turned on, so as to output a reference current signal through the first terminal of the reference resistor Rref.
In one embodiment, each of the current gain units includes a second MOS transistor, a first end of the second MOS transistor is externally connected to a working voltage signal, a second end of the second MOS transistor is connected to the switch unit, and a third end of the second MOS transistor is connected to a third end of the first MOS transistor.
In an embodiment, each of the switch units includes a third MOS transistor, a first end of the third MOS transistor is connected to the current gain unit, a second end of the third MOS transistor is connected to the output end of the current channel unit, and a third end of the third MOS transistor is connected to the register module.
In one embodiment, referring to fig. 6, the current gain unit and the switch unit in each current driving signal source may be electronic switch transistors, for example, the current gain unit in the first current driving signal source may be an electronic switch transistor MOS11, the switch unit in the first current driving signal source may be an electronic switch transistor MOS21, specifically, the electronic switch transistor MOS11 is used as a second MOS transistor, the electronic switch transistor MOS21 is used as a third MOS transistor, a first end of the electronic switch transistor MOS11 is connected to the operating voltage source V0, a second end of the electronic switch transistor MOS11 is connected to a first end of the electronic switch transistor MOS21, a third end of the electronic switch transistor MOS11 is connected to the reference current driving signal source for receiving the reference current signal and amplifying the reference current signal to form the sub-current driving signal, and a third end of the electronic switch transistor MOS21 is also used for receiving the switch control signal, to control the turning on and off of the sub-current drive signal. Furthermore, the second current channel unit comprises an electronic switching tube MOS12 and an electronic switching tube MOS22, the third current channel unit comprises an electronic switching tube MOS13 and an electronic switching tube MOS23, and so on, the Kth current driving signal source comprises an electronic switching tube MOS1K and an electronic switching tube MOS2K, K is more than or equal to 2, and K is an integer.
In one embodiment, the electronic switching transistor MOS1K may be a P-type MOS transistor, and the electronic switching transistor MOS2K may be an N-type MOS transistor. At this time, the electronic switching transistor MOS1K is used to form a current mirror to amplify the reference current signal and output the corresponding sub-current driving signal, and if the switching control signal is at high level, the electronic switching transistor MOS2K is turned on to output the sub-current driving signal, and the sub-current driving signals output by the plurality of current driving signal sources are added to form a current driving signal output.
In one embodiment, the electronic switch MOS10, the electronic switch MOS11, the electronic switch MOS12 and the electronic switch MOS13 … … in each current channel unit form a current mirror, and the current magnitude relations of the electronic switch MOS1K and the current magnitude relations of the electronic switch MOS10, the electronic switch MOS11, the electronic switch MOS12, and the electronic switch MOS13 … … in each current channel unit are 1:1:2:4: … …:2KThereby forming K paths of sub-current driving signals, controlling the on and off of the K paths of sub-current driving signals and realizing that the current of the current driving signals output by the current channel unit is from 1 time of reference current to 2 times of reference currentK +1Continuous regulation of the reference current by 1 times, in this embodiment, the electronic switching MOS21, MOS22, MOS23 … … and MOS2K are switching MOS transistors, the on and off of which are controlled by the switching control signal output by the register unitTherefore, the current magnitude of the current driving signal output by the current channel unit is selected to drive the corresponding light-emitting unit to display the corresponding gray scale brightness.
As shown in fig. 7, each current channel unit includes a sub-reference signal source, where the sub-reference signal source is configured to receive a corresponding sub-reference voltage signal and output a corresponding sub-reference current signal according to the sub-reference voltage signal, and at this time, each current driving signal source in the current channel unit receives the sub-reference current signal and generates a corresponding sub-current driving signal according to the sub-reference current signal.
In this embodiment, each current channel unit may include a sub-reference signal source, and the sub-reference signal source may output a corresponding sub-reference current signal according to the received sub-reference voltage signal, and at this time, each current driving signal source in the current channel unit may amplify the sub-reference current signal to generate a corresponding sub-current driving signal, and at the same time, the current driving signal source also controls the on and off of the sub-current driving signal according to the corresponding switch control signal, by arranging a sub-reference signal source in each current channel unit, the gray scale of each light-emitting unit can be controlled by adjusting the magnitude of the sub-reference current signal, and if the display module has N light-emitting units, N reference voltage signal sources need to be set to output N corresponding reference voltage signals.
In an embodiment, fig. 7 is a schematic structural diagram of a current channel module according to an embodiment of the present application, and fig. 7 shows a schematic structural diagram of only one current channel unit, as shown in fig. 7, a sub-reference signal source is disposed in each current channel unit, a register unit receives a data signal and outputs K switching control signals based on the data signal, and an electronic switching transistor MOS10 and a reference resistor Rref form a reference signal source, wherein the electronic switching transistor MOS10 is a first MOS transistor, specifically, a first end of the electronic switching transistor MOS10 is connected to a working voltage source V0, a second end of the electronic switching transistor MOS10, a third end of the electronic switching transistor MOS10, and a first end of the reference resistor Rref are connected in common and configured to output a reference current signal, and a second end of the reference resistor Rref is configured to receive a reference voltage signal The magnitude of the current signal is adjusted.
In one embodiment, the electronic switching device MOS10 may be a P-type MOS transistor, which forms a current on the reference resistor Rref when the P-type MOS transistor is turned on, so as to output a reference current signal through the first terminal of the reference resistor Rref. An embodiment of the present application further provides a driving method, applied to the driving circuit according to any of the above embodiments, including: receiving a data signal through the register module, and generating a group of switch control signals for each current channel unit based on the data signal; and controlling the current magnitude of the current driving signal output by the current channel unit according to the switch control signal.
In this embodiment, the register module receives an external data signal, and generates a set of switch control signals for each current channel unit based on the data signal, each current channel unit includes a plurality of current driving signal sources, each current driving signal source generates a sub-current driving signal, the plurality of sub-switch control signals respectively control the plurality of current driving signal sources to be turned on or turned off, output ends of the plurality of current driving signal sources are connected in common for outputting the current driving signal, and a current magnitude of the current driving signal is a sum of currents of the sub-current driving signals output by the plurality of driving signal sources, so that the current channel module controls a current magnitude of the current driving signal output by the current channel unit based on the corresponding sub-switch control signal.
In one embodiment, the current value of the sub-current driving signal generated by the kth current driving signal source in the current channel unit is 2 of the current value of the sub-current driving signal generated by the 1 st current driving signal sourcek-1Multiple, wherein k is more than or equal to 2 and is an integer; the current driver which outputs to the current channel unit according to the switch control signalThe current magnitude of the dynamic signal is controlled, and the method comprises the following steps: and a plurality of current driving signal sources in each current channel unit respectively output sub-current driving signals according to a plurality of corresponding sub-switch control signals.
In this embodiment, the current of the sub-current driving signal output by the ith current driving signal source in each current channel unit is set to be 2 of the sub-reference current signaliThe current magnitude relation of the two is 1:1:2:4: … …:2KThereby forming K paths of sub-current driving signals, controlling the on and off of the K paths of sub-current driving signals and realizing that the current of the current driving signals output by the current channel unit is from 1 time of reference current to 2 times of reference currentK+1-continuous adjustment of 1 time reference current, controlling on and off by the switch control signal output by the register unit, selecting the current magnitude of the current driving signal output by the current channel unit, and driving the corresponding light emitting unit to display 2 at mostK+1-1 gray-scale brightness.
Referring to fig. 8, an embodiment of the present application further provides a display device, including: the display module comprises N light-emitting units which are sequentially arranged; and the drive circuit is electrically connected with the display module and drives the display module to display the display picture according to the received data signal.
In one embodiment, each of the light emitting units is correspondingly connected with one of the current channel units.
Fig. 9 is a schematic diagram of an active display array driving architecture according to an embodiment of the present application, where the current driving unit in fig. 9 may be a driving circuit described in the above embodiment, and as shown in fig. 9, the active display array is driven and lighted by a scan signal and a data signal, where the signal processing unit receives an external video signal, and outputs a corresponding control signal according to the video signal to control the scan unit to output a corresponding scan signal, and simultaneously controls the current driving unit to output a corresponding data signal, so as to achieve the purpose of driving the active display array to light.
Fig. 10 is a schematic structural diagram of an active display array according to an embodiment of the present application, and referring to fig. 10, the display array includes a plurality of light emitting units, the plurality of light emitting units are arranged in an array, the active display array in this embodiment may be a display module in the above embodiment, in this embodiment, the light emitting units include: a light emitting chip; and the active driving circuit is connected with the light-emitting chip and is used for receiving a scanning signal and a current driving signal output by the driving circuit so as to drive the light-emitting chip to be lightened.
In this embodiment, the light emitting chip may be the light source in fig. 10, and the active driving current in this embodiment may be the active driving chip in fig. 10.
In one embodiment, the light emitting chip may be any one of an LED chip, a Mini-LED chip, and a Micro-LED chip.
In one embodiment, referring to fig. 11, the active driving circuit includes: a capacitor C, a first switching unit 101, a second switching unit 102, a third switching unit 103, a fourth switching unit 104, a current driving signal input terminal, and a scan signal input terminal;
a first end of the first switching unit 101 is connected to the light emitting chip; a first end of the third switching unit 103 and a first end of the fourth switching unit 104 are commonly connected to a current driving signal input end, and the current driving signal input end is used for receiving the current driving signal; a second terminal of the third switching unit 103 is connected to a first terminal of the second switching unit 102; the second terminal of the first switch unit 101, the first terminal of the second switch unit 102 and the first terminal of the capacitor C are connected to the ground in common; a second terminal of the fourth switching unit 104, a second terminal of the capacitor C, a third terminal of the first switching unit 101, and a third terminal of the second switching unit 102 are connected in common; the third terminal of the third switching unit 103 and the third terminal of the fourth switching unit 104 are commonly connected to a scan signal input terminal, and the scan signal input terminal is configured to receive the scan signal.
In one embodiment, referring to fig. 11, the first switching unit 101 may be an electronic switching MOS1, the second switching unit 102 may be an electronic switching MOS2, the third switching unit 103 may be an electronic switching MOS3, and the fourth switching unit 104 may be an electronic switching MOS 4.
In one embodiment, the electronic switching transistor MOS1, the electronic switching transistor MOS2, the electronic switching transistor MOS3, and the electronic switching transistor MOS4 are all N-type MOS transistors.
The embodiment of the application provides a driving circuit, a driving method and a display device, the driving circuit comprises a register module and a current channel module, the current channel module comprises a plurality of current channel units, the register module generates a set of switch control signals for each current channel unit based on the data signals, a plurality of sub-switch control signals in each set of switch control signals control a plurality of sub-current driving signals output by the current driving signal source in each current channel unit, thereby realizing the control of the current magnitude of the current driving signals output by the current channel units, achieving the purpose of accurately controlling the gray scale of the light emitting units in the display module, solving the problems that the existing current driving mode needs an external current driver and needs to design a corresponding driving circuit unit in a display panel, greatly restricting the application range of the display panel.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit 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 (15)
1. A driver circuit, characterized in that the driver circuit comprises: the register module receives an external data signal and generates a group of switch control signals for each current channel unit based on the data signal;
each current channel unit comprises a plurality of current driving signal sources, each group of switch control signals comprises a plurality of sub-switch control signals, the plurality of sub-switch control signals are respectively in one-to-one correspondence with the plurality of current driving signal sources, each current driving signal source generates a sub-current driving signal, and the current magnitude of the current driving signal output by the current channel unit is controlled based on the corresponding sub-switch control signal.
2. The driving circuit of claim 1, wherein the current channel module further comprises:
the reference signal source outputs a reference current signal based on external voltage; each current driving signal source is connected with the reference signal source, generates the sub-current driving signal based on the reference current signal and a preset current parameter, and controls the output of the sub-current driving signal according to the received sub-switch control signal.
3. The drive circuit of claim 2, wherein the current drive signal source comprises a current gain unit connected to the reference signal source and a switching unit connected to the current gain unit;
the current gain unit and the reference signal source form a current mirror, and generate corresponding sub-current driving signals based on the reference current signal and preset current parameters;
the switching unit controls output of the sub current driving signal based on the sub switch control signal.
4. The driving circuit according to claim 1, wherein each of the current channel units includes a sub-reference signal source, and a plurality of the current driving signal sources in each of the current channel units are connected to the sub-reference signal source, wherein the current driving signal source includes a current gain unit connected to the reference signal source and a switch unit connected to the current gain unit, and each of the current gain units forms a current mirror with the sub-reference signal source;
the sub-reference signal source generates a sub-reference current signal based on an external sub-reference voltage, the plurality of current driving signal sources in each current channel unit respectively generate a plurality of sub-current driving signals with different current magnitudes based on the sub-reference current signal and a preset current parameter, and the output of the sub-current driving signals is controlled according to the received sub-switch control signals.
5. The driving circuit according to claim 4, wherein the plurality of current driving signal sources in each of the current channel units respectively generate a plurality of sub-current driving signals with different current magnitudes based on the sub-reference current signals and preset current parameters, and the method comprises:
the current of the sub-current drive signal output by the ith current drive signal source is 2 of the sub-reference current signaliMultiple, i is more than or equal to 1 and i is an integer.
6. The driving circuit according to claim 4, wherein the sub-reference signal source comprises a first MOS transistor and a current limiting resistor; the first end of the first MOS tube is externally connected with a working voltage signal, the first end of the current-limiting resistor is externally connected with a reference voltage signal, the second end of the first MOS tube, the second end of the current-limiting resistor and the third end of the first MOS tube are connected in common, and a corresponding reference current signal is output based on the reference voltage signal.
7. The driving circuit as claimed in claim 6, wherein each of the current gain units comprises a second MOS transistor, a first terminal of the second MOS transistor is externally connected to an operating voltage signal, a second terminal of the second MOS transistor is connected to the switching unit, and a third terminal of the second MOS transistor is connected to a third terminal of the first MOS transistor.
8. The driving circuit as claimed in claim 6, wherein each of the switch units comprises a third MOS transistor, a first terminal of the third MOS transistor is connected to the current gain unit, a second terminal of the third MOS transistor is connected to the output terminal of the current path unit, and a third terminal of the third MOS transistor is connected to the register module.
9. The driving circuit of claim 1, wherein the register module comprises a plurality of register units, each of the register units generating a set of corresponding switch control signals for a corresponding one of the current channel units based on the data signal.
10. A driving method applied to the driving circuit according to any one of claims 1 to 9, wherein the driving method comprises:
receiving a data signal through the register module, and generating a group of switch control signals for each current channel unit based on the data signal;
and controlling the current magnitude of the current driving signal output by the current channel unit according to the switch control signal.
11. The driving method according to claim 10, wherein a current value of the sub-current drive signal generated by the kth current drive signal source in the current channel unit is 2 of a current value of the sub-current drive signal generated by the 1 st current drive signal sourcek-1Multiple, wherein k is more than or equal to 2 and is an integer;
the controlling the current magnitude of the current driving signal output by the current channel unit according to the switch control signal includes:
and a plurality of current driving signal sources in each current channel unit respectively output sub-current driving signals according to a plurality of corresponding sub-switch control signals.
12. A display device, comprising:
the display module comprises a plurality of light-emitting units; and
the driving circuit according to any one of claims 1 to 9, wherein the driving circuit is electrically connected to the display module, and generates a corresponding current driving signal according to the received data signal to drive the display module to display a display image.
13. The display device as claimed in claim 12, wherein each of the light emitting units is connected to a corresponding one of the current path units.
14. The display device according to claim 12, wherein the light emitting unit comprises:
a light emitting chip;
and the active driving circuit is connected with the light-emitting chip and drives the light-emitting chip to display corresponding brightness based on the received scanning signal and the current driving signal output by the driving circuit.
15. The display device of claim 14, wherein the active drive circuit comprises: the circuit comprises a capacitor, a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a current driving signal input end and a scanning signal input end;
the first end of the first switch unit is connected with the light-emitting chip, the first end of the third switch unit, the first end of the fourth switch unit and the current driving signal input end are connected in common, the second end of the third switch unit is connected with the first end of the second switch unit, the second end of the first switch unit, the first end of the second switch unit and the first end of the capacitor are connected to the ground in common, the second end of the fourth switch unit, the second end of the capacitor, the third end of the first switch unit and the third end of the second switch unit are connected in common, and the third end of the third switch unit, the third end of the fourth switch unit and the scanning signal input end are connected in common.
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