CN114677966A - Micro-LED display device and feedback compensation circuit thereof - Google Patents
Micro-LED display device and feedback compensation circuit thereof Download PDFInfo
- Publication number
- CN114677966A CN114677966A CN202210412128.3A CN202210412128A CN114677966A CN 114677966 A CN114677966 A CN 114677966A CN 202210412128 A CN202210412128 A CN 202210412128A CN 114677966 A CN114677966 A CN 114677966A
- Authority
- CN
- China
- Prior art keywords
- module
- driving
- micro
- feedback
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
- 230000000295 complement effect Effects 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 11
- 238000007599 discharging Methods 0.000 abstract description 6
- 101710170231 Antimicrobial peptide 2 Proteins 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 101710170230 Antimicrobial peptide 1 Proteins 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a Micro-LED display device and a feedback compensation circuit thereof, wherein the feedback compensation circuit comprises a data current generation module, a current detection module, an I-V conversion module, a reference voltage module, a driving signal generation module and a complementary switch module, wherein the data current generation module is used for generating data current, the current detection module is used for providing reference voltage for a feedback circuit in a programming stage so as to accelerate the establishment speed of the feedback current, and the I-V conversion module is used for generating a voltage signal according to the difference value between the feedback current and the data current and inputting the signal to the complementary switch module; the reference voltage module is used for providing reference voltage, the driving signal generating module is connected with the complementary switch module, and the complementary switch module is used for providing driving signals for the pixel circuit so as to control the charging process and the discharging process of the driving tube in the pixel circuit. According to the technical scheme, the compensation precision and the compensation speed of the Micro-LED display device can be guaranteed simultaneously.
Description
Technical Field
The invention belongs to the technical field of Micro-LED equipment, and particularly relates to Micro-LED display equipment and a feedback compensation circuit for Micro-LED display.
Background
Micro-LEDs refer to the formation of display devices by high density (200PPI or more) integration of sub-micron sized Light Emitting Diodes (LEDs) in the form of an active matrix. Compared with the traditional large-size LED device with the working current density of about 100Acm & lt-2 & gt, the Micro-LED can work under the extremely high current density of 4.6kAcm & lt-2 & gt, and extremely high optical output power and the modulation bandwidth of 435MHz are realized; compared with a traditional organic light emitting diode display (OLED), the Micro-LED is made of inorganic materials, the service life of red, green and blue pixels is long, and the problem of uneven display caused by different attenuation speeds of OLED pixels is solved. Moreover, the research shows that the light output power of the Micro-LED with the diameter of 20 mu m is almost unchanged after the Micro-LED is conducted for 300 hours under the ultrahigh current density of 3.5kA cm < -2 >. Because the Micro-LED has the advantages of low power consumption, high brightness, ultrahigh resolution, high color saturation, high reaction speed, super power saving, long service life, high efficiency and the like in performance, the Micro-LED technology has good development prospect in small-size mobile phone application or large-size television screen application.
For Micro-LED display devices, the display quality of large-sized high-resolution Micro-LEDs is limited by their slow driving speed due to their characteristics of large parasitic resistance capacitance and short scanning time. Further, when a bias voltage is applied for a long time, electrical characteristics such as a threshold voltage and mobility of a thin film transistor constituting an active matrix change, and thus, a Micro-LED display has a problem of screen unevenness. In large-sized Micro-LED display devices, external compensation is considered as a preferred best solution to the above-mentioned problems.
At present, two external compensation modes of Micro-LED display equipment are available, namely external voltage compensation and external current compensation, and the advantages and the disadvantages are as follows: the external current compensation mode has high compensation precision, but the parasitic capacitance can seriously influence the compensation speed of the circuit, the existing external current compensation circuit needs more than 100 mu s to complete the compensation function, and the improved circuit still needs 50 mu s, thereby limiting the application of the Micro-LED. The external voltage compensation circuit can improve the compensation speed, but the current error rate of the external circuit of the Micro-LED subjected to external voltage compensation is about 10%, so that the external voltage compensation method has the problem of low compensation precision.
In summary, in the Micro-LED display device in the prior art, the feedback compensation circuit cannot simultaneously ensure the compensation precision and the compensation speed of the Micro-LED display device.
Disclosure of Invention
The invention aims to provide Micro-LED display equipment and a feedback compensation circuit thereof, which are used for at least solving the problem that the feedback compensation circuit of the Micro-LED display equipment cannot simultaneously ensure the compensation precision and the compensation speed of the Micro-LED display equipment.
In order to solve at least the above problems, in a first aspect, the present invention provides a feedback compensation circuit for Micro-LED display, including a data current generation module, a current detection module, an I-V conversion module, and a complementary switch module, wherein: one end of the data current generation module is connected with the input end of the I-V conversion module and is used for generating data current; the output end of the current detection module is connected with the input end of the I-V conversion module, the input end of the current detection module is used for being connected with the pixel circuit through a feedback line to obtain the feedback current of the pixel circuit, and the current detection module is used for providing reference voltage for the feedback line in a programming stage to accelerate the establishment speed of the feedback current of the pixel circuit; the output end of the I-V conversion module is connected with the complementary switch module and used for generating a voltage signal according to the difference value between the feedback current and the data current and inputting the voltage signal to the complementary switch module; the complementary switch module is provided with two power supply ends which are respectively used for connecting the driving signal generation module and the reference voltage module, and the output end of the complementary switch is used for connecting the pixel circuit through a data line so as to provide a driving signal for the pixel circuit.
According to an embodiment of the present invention, the current detection module includes a first operational amplifier and a first MOS transistor, wherein: the inverting input end of the first operational amplifier is used for being connected with a reference voltage module, the positive input end of the first operational amplifier is used for being connected with a feedback circuit of the pixel circuit, and the output end of the first operational amplifier is connected with the grid electrode of the first MOS tube; and the source electrode of the first MOS tube is connected with the positive phase input end of the first operational amplifier, and the drain electrode of the first MOS tube is connected with the input end of the I-V conversion module.
According to another embodiment of the present invention, the I-V conversion module includes a second operational amplifier and a matching resistor, wherein: the positive phase input end of the second operational amplifier is used for being connected with a reference voltage module, and the negative phase input end of the second operational amplifier is connected with one end of the data current generation module and the output end of the current detection module; one end of the matching resistor is connected with the positive phase input end of the first operational amplifier, and the other end of the matching resistor is connected between the negative phase input ends of the first operational amplifier.
According to another embodiment of the present invention, the complementary switch module includes a second MOS transistor and a third MOS transistor, wherein gates of the second MOS transistor and the third MOS transistor are connected to an output terminal of the I-V conversion module, drains of the second MOS transistor and the third MOS transistor are respectively connected to the driving signal generation module and the reference voltage module, and sources of the second MOS transistor and the third MOS transistor are connected to each other and are connected to the pixel circuit through a data line.
According to another embodiment of the present invention, the apparatus further comprises a driving signal generating module, wherein the driving signal generating module is used for generating a ramp signal, a sine signal and/or a pulse signal.
In a second aspect, the present invention further provides a Micro-LED display device, including a pixel circuit and a feedback compensation circuit for Micro-LED display according to any one of the above embodiments.
According to an embodiment of the present invention, the pixel circuit includes a switching module, a driving module, and a light emitting device, wherein: one end of the switch module is connected with the feedback compensation circuit, and the other end of the switch module is connected with the driving module and the lighting module and is used for controlling the on-off of the feedback compensation circuit with the driving module and the lighting module; the driving module is arranged on a circuit of the light-emitting device for connecting the power supply and is used for controlling the current on the light-emitting device so as to control the light-emitting characteristic of the light-emitting device.
According to another embodiment of the present invention, the switch module comprises a first switch tube and a second switch tube, wherein: the grids of the first switching tube and the second switching tube are mutually connected and are used for connecting a line scanning control signal line; the drain electrode of the first switching tube is connected with the I-V conversion module, and the drain electrode of the second switching tube is connected with the current detection module; the source electrode of the first switch tube is connected with the driving module, and the source electrode of the second switch tube is connected with the power supply end of the light-emitting device.
According to another embodiment of the present invention, the driving module includes a driving transistor, a gate of the driving transistor is connected to the switching module, a source of the driving transistor is connected to a power source of the light emitting device, and a drain of the driving transistor is connected to the power module.
According to another embodiment of the present invention, the driving module further comprises a storage capacitor, and two ends of the storage capacitor are respectively connected to the gate and the source of the driving tube.
According to the technical scheme provided by the invention, the I-V conversion module can generate a voltage signal according to the difference value between the data current and the feedback current and send the voltage signal to the complementary switch module, and the complementary switch module can obtain a driving signal according to the voltage signal so as to control the charging process and the discharging process of a driving tube in the pixel circuit, so that the compensation precision of the Micro-LED display equipment is improved. On the other hand, the current detection module can also provide reference voltage for the feedback circuit in the programming stage, so that the establishment speed of the feedback current fed back to the feedback compensation circuit by the pixel circuit is increased, and the compensation speed can be increased. In summary, according to the technical scheme provided by the invention, the feedback compensation circuit can simultaneously ensure the compensation precision and the compensation speed of the Micro-LED display device.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
FIG. 1 is a schematic structural diagram of a Micro-LED device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pixel circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a switch module according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of a driving module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a feedback compensation circuit for a Micro-LED display according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a current detection module according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an I-V conversion module according to an embodiment of the present invention;
fig. 8 is a structural schematic of a complementary switch module according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present application are described below clearly and completely with reference to the drawings in the embodiments of the present application, and it should be understood by those skilled in the art that the embodiments described below 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.
Referring to fig. 1, fig. 1 shows a Micro-LED device provided in the present application, which includes a feedback compensation circuit and a pixel circuit, wherein an external compensation driving circuit is connected to the pixel circuit through a data line and a feedback line, and can send a control signal to the pixel circuit through the data line and obtain a feedback current of the pixel current through the feedback line. The following description will first describe the pixel circuit in detail with reference to specific application scenarios.
As shown in fig. 2, in one embodiment, the pixel circuit includes a switch module, a driving module, and a light emitting device, wherein the light emitting device is a Micro-LED, and the light emitting device has different light emitting characteristics when the current flowing through the light emitting device is different in magnitude. The driving module is arranged on a circuit for connecting a power supply end of the light-emitting device with the power supply module, and can control the current on the light-emitting device so as to control the light-emitting characteristic of the light-emitting device. One side of the switch module is connected with the feedback compensation circuit, and the other side of the switch module is connected with the driving module and the lighting module, so that the on-off of the feedback compensation circuit, the driving module and the lighting module can be controlled.
The following description of the switching module and the driving module in the pixel circuit are respectively described in detail, and it is to be understood that the following description of the switching module and the driving module is an implementation manner thereof, and is exemplary and not limiting.
As shown in fig. 3, in an embodiment, the switch module includes a first switch transistor T1 and a second switch transistor T2, and the first switch transistor T1 and the second switch transistor T2 may adopt TFT transistors (thin film transistors), wherein a gate of the first switch transistor T1 is connected to a gate of the second switch transistor T2, and a gate of the first switch transistor T1 and a gate of the second switch transistor T2 are connected to each other and are both connected to a switch control signal line VSCAN. The drain of the first switch transistor T1 is connected to the feedback compensation circuit through a data line, and the source is connected to the driving module; the drain of the second switch transistor T2 is connected to the feedback compensation circuit through a feedback line, and the source is connected to the power supply terminal of the light emitting device. The setting mode of the embodiment can control the switch to control the signal line V in the display stage of the Micro-LED equipmentSCANTaking low level to make the first switch tube T1 and the second switch tube T2 cut off the connection between the feedback compensation circuit and the driving module and the display device under the drive of low level; in the programming stage, the switch signal line V can be controlledSCANAnd taking high level to connect the feedback compensation circuit with the driving module and the display device.
In one embodiment, the driving module comprises a driving tube TDThe driving pipe TDThe gate of the first switch transistor T1 is connected to the switch module, for example, the source of the first switch transistor T1; driving tube TDThe source electrode of the light emitting device is connected with the power end of the light emitting device, and the drain electrode of the light emitting device is connected with the power module VDDFor example, when the light emitting device is a Micro-LED, the driving tube T is drivenDIs connected to its anode and a power supply Vss is connected to its cathode. When driving the tube TDWhen the LED is conducted, the power supply module V can be connected with the light-emitting deviceDDThe light emitting device can be powered when the voltage difference between the power supply Vss and the power supply Vss is greater than the turn-on voltage of the light emitting device, and the light emitting device can be powered by the driving tube TDThe current on the light-emitting device can be controlled, thereby realizing the light emission of the light-emitting deviceControl of the light characteristics.
In another embodiment, as shown in fig. 4, the driving module further comprises a storage capacitor Cs, one end of which is connected to the driving tube TDThe other end of the grid is connected with a driving tube TDOf the substrate. The present embodiment is arranged in such a manner that the tube T is drivenDWhen the driving transistor is turned off, the voltage of the gate thereof is held in the storage capacitor Cs, and the storage capacitor Cs can continue to drive the driving transistor TDTo provide stable current for the light emitting device, so that the light emitting device can continuously and uniformly emit light.
The feedback compensation circuit in the application is connected with the pixel circuit, so that the control of the charging and discharging process of the grid voltage of the driving tube in the pixel circuit can be realized, and the influence of parasitic capacitance on the feedback circuit on the compensation precision is reduced. The feedback compensation circuit of the present application will be described in detail below with reference to specific application scenarios.
As shown in FIG. 5, in one embodiment, the feedback compensation circuit of the Micro-LED display comprises a data current generation module, a current detection module, an I-V conversion module and a complementary switch module, wherein a reference voltage module is connected with the I-V conversion module, the complementary switch module and the current detection module and is used for providing a reference voltage V for the I-V conversion module, the complementary switch module and the current detection moduleREF. The data current generation module may include a programmable current source having a power terminal connected to the power supply module VDDData voltages may be converted into data currents and transferred to the I-V conversion module, where the data voltages are converted from corresponding video signals.
The input end of the current detection module is connected with the pixel circuit through a feedback circuit to obtain feedback current, and the output end of the current detection module is connected with the input end of the I-V conversion module to transmit the feedback current to the I-V conversion module. For example, one end of the data current generating module may intersect with the output end of the current output module at a node a, and the input end of the I-V converting module is connected to the node a, in this embodiment, the data current is set as IDATAThe feedback current is IFDThen the current at node A is IFD-IDATAI.e. obtained by I-V conversion modulesThe current being a feedback current IFDAnd a data current IDATAThe difference between them. The output end of the I-V conversion module is connected with the complementary switch module, and after the difference value between the feedback current and the data current is obtained, a voltage signal can be generated according to the difference value and is transmitted to the complementary switch module so as to control the switch of the complementary switch module. In addition, the current detection module can also provide a reference voltage for the feedback circuit in the programming stage so as to accelerate the establishment speed of the feedback current fed back to the feedback compensation circuit by the pixel circuit.
The complementary switch module has a signal end connected to the driving signal generating module to obtain the driving signal generated by the driving signal generating module, and an output end connected to the other end of the data line for generating the driving signal according to the control signal and the driving signal and transmitting the driving signal to the driving module via the data line to drive the device in the driving module (e.g. the driving transistor T in the driving module)D) The charging process and the discharging process are controlled, and the control precision of the pixel circuit is improved.
In the setting manner of this embodiment, the working process of the feedback compensation circuit includes a programming phase and a display phase, where the programming phase is a phase of converting a current value required for displaying the display device to a data current value, and the display phase is a phase when the power module drives the display device to display through the driving module. Switching control signal line V during display phaseSCANObtaining a low level VLGWhen the switching module is turned off (i.e. the first switching transistor T1 and the second switching transistor T2 are turned off under the low level driving), the connection between the feedback compensation circuit and the driving module and the display device in the pixel circuit is broken. In the programming stage, the line scanning switch controls the signal line VSCANObtaining a high level VGHThe switch module is turned on (i.e. the first switch transistor T1 and the second switch transistor T2 are turned on under the driving of a high level), and the feedback compensation circuit is connected to the driving module and the display device in the pixel circuit. Under the action of the current detection module, a reference voltage V is prestored on the feedback circuitREFReference voltage VREFIs less than the turn-on voltage drop and the voltage V of the display deviceSSSum, drive tube TDMedium current IDFlowing through a feedback line to a feedback compensation circuit to charge node a, thereby boosting the voltage at node a; when the voltage V of the node AAGreater than a reference voltage VREFTime, i.e. data current IDATAGreater than the feedback current IFBWhen the driving circuit is in use, the I-V conversion module sends out a first voltage signal to enable the complementary switch module to output the voltage signal generated by the driving signal generation module so as to drive the driving tube T in the driving moduleDThe grid electrode of the driving tube T is charged to drive the driving tube TDDrive current I ofDGradually increase from 0; when driving a current IDContinuously rising until IFB＝IDATA＜IDThen, the I-V conversion module sends out a second voltage signal to make the storage capacitor CSTo a reference voltage VREFDischarge to lower the driving tube TDThereby reducing the driving current ID. After multiple times of the charging and discharging processes, the feedback current I can be enabledFBData current IDATAAnd a drive current IDAnd the circuit loops of the whole Micro-LED device are stabilized.
The current detection module, the I-V conversion module and the complementary switch module in the feedback compensation circuit are respectively described in detail below, and it is understood that the following description of the current detection module, the I-V conversion module and the complementary switch module is an implementation manner thereof, and is exemplary and not limiting.
As shown in FIG. 6, in one embodiment, the current detection module in the feedback compensation circuit comprises a first operational amplifier AMP1 and a first MOS transistor M1, wherein an inverting input terminal of the first operational amplifier AMP1 is connected to a reference voltage module of the reference voltage modules to obtain a reference voltage VREFThe positive phase input end is connected with the feedback circuit, and the output end is connected with the grid electrode of the first MOS tube; the source electrode of the first MOS tube is connected with the output end of the data current generation module, and the drain electrode of the first MOS tube is connected with the non-inverting input end of the first budget amplifier AMP 1. In the setting mode of this embodiment, during the programming phase, the switch module in the pixel circuit is turned on (i.e. the first switch transistor T1 and the second switch transistor T2 are turned on), and the output terminal of the first operational amplifier AMP1 may be connectedFor providing a reference voltage V on the feedback lineREFTherefore, the speed of establishing the feedback current fed back to the feedback compensation circuit by the pixel circuit is increased.
As shown in fig. 7, in one embodiment, the I-V conversion module in the feedback compensation circuit includes a second operational amplifier AMP2 and a resistor R, wherein one end of the resistor R is connected to the non-inverting input terminal of the second operational amplifier AMP2, and the other end is connected to the inverting input terminal of the second transport amplifier AMP 2. The non-inverting input terminal of the second operational amplifier AMP2 is connected to the reference voltage module to obtain the reference voltage VREFThe inverting input terminal is connected to the output terminal of the current detection module and the output terminal of the data current generation module (i.e., to the node a), and the output terminal is connected to the signal input terminal of the complementary switch module. The present embodiment is configured such that, in the programming stage, when the voltage of the node A is less than the reference voltage VREFWhen, i.e. the data current is greater than the feedback current IFBAt this time, the output terminal of the second transport amplifier AMP2 outputs a high-level voltage signal, i.e. the first voltage signal, so that the complementary switch module can output the voltage signal generated by the driving signal generating module to the driving transistor T in the driving moduleDThe grid electrode of the driving tube T is charged, and then the driving tube T is drivenDDrive current I ofDGradually increase from 0; when driving a current IDContinuously rising until IFB＝IDATA＜IDAt this time, the output terminal of the second transport amplifier AMP2 outputs a low level voltage signal, i.e., the second voltage signal, to drive the transistor TDGate and storage capacitor CSTo a reference voltage VREFDischarge to drive the tube TDThe gate voltage of the transistor is decreased, thereby reducing the driving current ID。
As shown in fig. 8, in an embodiment, the complementary switching module in the feedback compensation circuit includes a second MOS transistor M2 and a third MOS transistor M3, wherein the gates of the second MOS transistor M2 and the third MOS transistor M3 are both connected to the output terminal of the I-V conversion module (such as the output terminal of the second operational amplifier mentioned above), the drain of the second MOS transistor M2 is connected to the driving signal generation module to obtain the driving signal, and the drain of the third MOS transistor M3 is connected to the reference voltage to obtain the reference voltage signal; the source of the second MOS transistor M2 is connected to the source of the third MOS transistor M3, and the source of the second MOS transistor M2 and the source of the third MOS transistor M3 are both connected to the other end of the data line, that is, one end of the data line is connected to the pixel circuit, and the other end is connected to the source of the second MOS transistor M2 and the source of the third MOS transistor M3. When the signal output by the I-V conversion module is the first voltage signal (i.e. when the second transport amplifier AMP2 outputs the high voltage signal), the second MOS transistor M2 is turned on, and the second MOS transistor M2 may link the driving signal generation module to the gate of the driving transistor TD in the pixel circuit through the data line, and may send the driving signal to the driving transistor TD in the pixel circuit; when the signal output by the I-V conversion module is the second voltage signal (i.e. the second transport amplifier AMP2 outputs the low voltage signal), the third MOS transistor M3 is turned on, and the third MOS transistor M3 may link the reference voltage source to the gate of the driving transistor TD in the pixel circuit through the data line.
In one embodiment, the feedback compensation circuit further includes a driving signal generating module, and the driving signal generating module is connected to one power terminal (for example, the drain of the second MOS transistor) of the complementary switching module. The driving signal generating module of this embodiment includes a voltage signal source, which may generate one or more of a ramp signal, a pulse signal, and a sinusoidal signal, and when the complementary switch module receives the first voltage signal output by the I-V conversion module, transmits the signal output by the driving signal generating module to the driving module as the driving signal. For example, when the second operational amplifier AMP2 outputs a high level signal, the second MOS transistor is turned on and transmits the signal output by the driving signal generation block to the driving block as the driving signal.
In summary, according to the technical scheme provided by the application, the I-V conversion module in the feedback compensation circuit can generate a voltage signal according to a difference between the data current and the feedback current and send the voltage signal to the complementary switch module, and the complementary switch module can obtain a driving signal according to the voltage signal to control a charging process and a discharging process of a driving tube in the pixel circuit, so that the compensation precision of the Micro-LED display device is improved. On the other hand, the current detection module can also provide reference voltage for the feedback circuit in the programming stage, so that the establishment speed of the feedback current fed back to the feedback compensation circuit by the pixel circuit is increased, and the compensation speed can be increased. According to the technical scheme provided by the invention, the feedback compensation circuit can simultaneously ensure the compensation precision and the compensation speed of the Micro-LED display equipment.
On the other hand, the invention also provides a feedback compensation circuit for Micro-LED display, which is the same as the feedback compensation circuit for Micro-LED display devices in the above embodiments, and since the feedback compensation circuit has been described in detail above, it is not described much in this embodiment.
The use of the terms "first" or "second," etc. in this specification to refer to a number or ordinal terms is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "a plurality" means at least two, for example, two, three or more, and the like, unless specifically defined otherwise.
While various embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the present invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. It is intended that the following claims define the scope of the invention and that the module compositions, equivalents, or alternatives falling within the scope of these claims be covered thereby.
Claims (10)
1. The feedback compensation circuit for Micro-LED display is characterized by comprising a data current generation module, a current detection module, an I-V conversion module and a complementary switch module, wherein:
one end of the data current generation module is connected with the input end of the I-V conversion module and is used for generating data current;
the output end of the current detection module is connected with the input end of the I-V conversion module, the input end of the current detection module is used for being connected with the pixel circuit through a feedback line to obtain the feedback current of the pixel circuit, and the current detection module is used for providing reference voltage for the feedback line in a programming stage to accelerate the establishment speed of the feedback current of the pixel circuit;
the output end of the I-V conversion module is connected with the complementary switch module and used for generating a voltage signal according to the difference value between the feedback current and the data current and inputting the voltage signal to the complementary switch module;
the complementary switch module is provided with two power supply ends which are respectively used for connecting the driving signal generating module and the reference voltage module, and the output end of the complementary switch is used for connecting the pixel circuit through a data line so as to provide a driving signal for the pixel circuit.
2. A feedback compensation circuit for a Micro-LED display as recited in claim 1, wherein the current sensing module comprises a first operational amplifier and a first MOS transistor, wherein:
the inverting input end of the first operational amplifier is used for being connected with a reference voltage module, the positive input end of the first operational amplifier is used for being connected with a feedback circuit of the pixel circuit, and the output end of the first operational amplifier is connected with the grid electrode of the first MOS tube;
and the source electrode of the first MOS tube is connected with the positive phase input end of the first operational amplifier, and the drain electrode of the first MOS tube is connected with the input end of the I-V conversion module.
3. A feedback compensation circuit for a Micro-LED display as recited in claim 1, wherein said I-V conversion module includes a second operational amplifier and a matching resistor, wherein:
the positive phase input end of the second operational amplifier is used for being connected with a reference voltage module, and the negative phase input end of the second operational amplifier is connected with one end of the data current generation module and the output end of the current detection module;
one end of the matching resistor is connected with the positive phase input end of the first operational amplifier, and the other end of the matching resistor is connected between the negative phase input ends of the first operational amplifier.
4. The feedback compensation circuit of a Micro-LED display of claim 1, wherein the complementary switch module includes a second MOS transistor and a third MOS transistor, wherein: the grid electrodes of the second MOS tube and the third MOS tube are connected with the output end of the I-V conversion module, the drain electrodes of the second MOS tube and the third MOS tube are respectively used for being connected with the driving signal generation module and the reference voltage module, and the source electrodes of the second MOS tube and the third MOS tube are mutually connected and are used for being connected with the pixel circuit through a data line.
5. A feedback compensation circuit for a Micro-LED display as recited in claim 1, further comprising a driving signal generation module, said driving signal generation module configured to generate a ramp signal, a sinusoidal signal and/or a pulse signal.
6. A Micro-LED display device comprising a pixel circuit and a feedback compensation circuit for a Micro-LED display according to any of claims 1-4.
7. A Micro-LED display device according to claim 6, wherein the pixel circuit comprises a switching module, a driving module and a light emitting device, wherein:
one end of the switch module is connected with the feedback compensation circuit, and the other end of the switch module is connected with the driving module and the lighting module and is used for controlling the on-off of the feedback compensation circuit with the driving module and the lighting module;
the driving module is arranged on a circuit of the light-emitting device for connecting the power supply and is used for controlling the current on the light-emitting device so as to control the light-emitting characteristic of the light-emitting device.
8. A Micro-LED display device according to claim 7, wherein the switch module comprises a first switch tube and a second switch tube, wherein:
the grids of the first switching tube and the second switching tube are mutually connected and are used for connecting a line scanning control signal line;
the drain electrode of the first switching tube is connected with the I-V conversion module, and the drain electrode of the second switching tube is connected with the current detection module;
the source electrode of the first switch tube is connected with the driving module, and the source electrode of the second switch tube is connected with the power supply end of the light-emitting device.
9. A Micro-LED display device according to claim 7, wherein the driving module comprises a driving transistor having a gate connected to the switching module, a source connected to a power supply terminal of the light emitting device, and a drain for connection to a power supply module.
10. A Micro-LED display device according to claim 9, wherein the driving module further comprises a storage capacitor having two ends connected to the gate and source of the driving transistor, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210412128.3A CN114677966B (en) | 2022-04-19 | Micro-LED display device and feedback compensation circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210412128.3A CN114677966B (en) | 2022-04-19 | Micro-LED display device and feedback compensation circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114677966A true CN114677966A (en) | 2022-06-28 |
| CN114677966B CN114677966B (en) | 2024-09-24 |
Family
ID=
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060164344A1 (en) * | 2003-07-02 | 2006-07-27 | Fish David A | Electroluminescent display devices |
| US20090020686A1 (en) * | 2007-07-19 | 2009-01-22 | Tpo Displays Corp. | Reading circuit, display panel and electronic system utilizing the same |
| CN102426822A (en) * | 2004-06-29 | 2012-04-25 | 伊格尼斯创新有限公司 | Voltage-programming scheme for current-driven amoled displays |
| CN104680976A (en) * | 2015-02-09 | 2015-06-03 | 京东方科技集团股份有限公司 | Pixel compensation circuit, display device and driving method |
| US20160372030A1 (en) * | 2014-12-24 | 2016-12-22 | Boe Technology Group Co., Ltd. | Pixel Circuit, Organic Electroluminescent Display Panel and Display Device |
| CN110136638A (en) * | 2019-05-15 | 2019-08-16 | 中南大学 | Active illuminant outside display compensation circuit, drive system and driving signal optimization method |
| CN110728329A (en) * | 2019-07-13 | 2020-01-24 | 中南大学 | Concentrate grade prediction method based on feedback compensation mechanism optimization in zinc flotation process |
| US20210142728A1 (en) * | 2018-05-31 | 2021-05-13 | Hefei Boe Optoelectronics Technology Co., Ltd. | Pixel circuit, driving method thereof and display device |
| KR20220004874A (en) * | 2020-07-03 | 2022-01-12 | 엘지디스플레이 주식회사 | Display and driving method thereof |
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060164344A1 (en) * | 2003-07-02 | 2006-07-27 | Fish David A | Electroluminescent display devices |
| CN102426822A (en) * | 2004-06-29 | 2012-04-25 | 伊格尼斯创新有限公司 | Voltage-programming scheme for current-driven amoled displays |
| US20090020686A1 (en) * | 2007-07-19 | 2009-01-22 | Tpo Displays Corp. | Reading circuit, display panel and electronic system utilizing the same |
| US20160372030A1 (en) * | 2014-12-24 | 2016-12-22 | Boe Technology Group Co., Ltd. | Pixel Circuit, Organic Electroluminescent Display Panel and Display Device |
| CN104680976A (en) * | 2015-02-09 | 2015-06-03 | 京东方科技集团股份有限公司 | Pixel compensation circuit, display device and driving method |
| US20210142728A1 (en) * | 2018-05-31 | 2021-05-13 | Hefei Boe Optoelectronics Technology Co., Ltd. | Pixel circuit, driving method thereof and display device |
| CN110136638A (en) * | 2019-05-15 | 2019-08-16 | 中南大学 | Active illuminant outside display compensation circuit, drive system and driving signal optimization method |
| CN110728329A (en) * | 2019-07-13 | 2020-01-24 | 中南大学 | Concentrate grade prediction method based on feedback compensation mechanism optimization in zinc flotation process |
| KR20220004874A (en) * | 2020-07-03 | 2022-01-12 | 엘지디스플레이 주식회사 | Display and driving method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI417840B (en) | Pixel circuit, active matrix organic light emitting diode (oled) display and driving method for pixel circuit | |
| CN106782319B (en) | Pixel circuit, pixel driving method and display device | |
| CN107424570A (en) | Pixel unit circuit, image element circuit, driving method and display device | |
| US10170047B2 (en) | Organic light emitting display and driving method thereof | |
| CN107342043A (en) | Pixel driving circuit, control method thereof, display panel and display device | |
| CN105448234B (en) | Pixel circuit and its driving method and active matrix/organic light emitting display | |
| CN102376253A (en) | Display device and driving method thereof | |
| KR102654591B1 (en) | Display device and clock and voltage generation circuit | |
| CN109036283B (en) | Driving circuit and driving method of organic light-emitting field effect transistor and display device | |
| TWI390488B (en) | Drive circuit and drive method of light emitting display apparatus | |
| CN103198793A (en) | Pixel circuit, drive method and display device thereof | |
| US11615738B2 (en) | Pixel driving circuit and driving method therefor, display panel, and display apparatus | |
| CN106803417A (en) | Pixel compensation circuit and driving method, display device | |
| CN107068058B (en) | Pixel-driving circuit, display panel and image element driving method | |
| US11620939B2 (en) | Pixel driving circuit and driving method therefor, display panel, and display apparatus | |
| CN114550656B (en) | Drive circuit, drive device, and display device | |
| CN109313876A (en) | Using the method for feedback compensation driving pixel circuit, drives the circuit of luminescent device and show equipment | |
| WO2018196094A1 (en) | Pixel driving circuit, display panel and pixel driving method | |
| WO2023236501A1 (en) | Compensation circuit, control chip and display apparatus | |
| CN114333704A (en) | Pixel driving circuit, driving method thereof and display panel | |
| CN111312173A (en) | Pixel circuit and pixel driving method | |
| CN100428312C (en) | Electrolumi nescence display device and its driving method | |
| CN203134328U (en) | Pixel circuit and display device thereof | |
| CN115588402B (en) | Driving circuit and display panel | |
| CN114677966B (en) | Micro-LED display device and feedback compensation circuit thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |