CN112967681B - Drive circuit, light-emitting component and display device - Google Patents

Drive circuit, light-emitting component and display device Download PDF

Info

Publication number
CN112967681B
CN112967681B CN202110365402.1A CN202110365402A CN112967681B CN 112967681 B CN112967681 B CN 112967681B CN 202110365402 A CN202110365402 A CN 202110365402A CN 112967681 B CN112967681 B CN 112967681B
Authority
CN
China
Prior art keywords
signal
switch
driving
module
voltage
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.)
Active
Application number
CN202110365402.1A
Other languages
Chinese (zh)
Other versions
CN112967681A (en
Inventor
东强
孙晓平
马从华
王丽花
唐佳茵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Tianma Microelectronics Co Ltd
Original Assignee
Shanghai Tianma Microelectronics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shanghai Tianma Microelectronics Co Ltd filed Critical Shanghai Tianma Microelectronics Co Ltd
Priority to CN202110365402.1A priority Critical patent/CN112967681B/en
Publication of CN112967681A publication Critical patent/CN112967681A/en
Application granted granted Critical
Publication of CN112967681B publication Critical patent/CN112967681B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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]
    • 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]
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention provides a driving circuit, a light-emitting component and a display device, comprising a gating module, a storage module and a driving switch; the gating module transmits the data signal to the storage module in a first period under the control of the scanning signal, and transmits the reference signal to the storage module in a second period, so that the data signal and the reference signal are superposed at the storage module and a driving signal is generated; if the voltage of the driving signal is greater than or equal to the starting voltage of the driving switch, the driving switch is started and controls the light-emitting device to emit light, so that the pulse width of the generated driving signal can be adjusted by adjusting the pulse width of the reference signal, further, the starting time of the driving switch can be adjusted, the light-emitting time of the light-emitting device can be adjusted by adjusting the starting time of the driving switch, further, the total brightness of the light-emitting device in a light-emitting period can be adjusted, further, the accurate control of the gray scale of the display picture can be realized, and the improvement of the display effect of the display picture can be facilitated.

Description

Drive circuit, light-emitting component and display device
Technical Field
The invention relates to the technical field of displays, in particular to a driving circuit, a light emitting component and a display device.
Background
With the continuous development of science and technology, more and more electronic devices with display functions are widely applied to daily life and work of people, bring great convenience to the daily life and work of people, and become an indispensable important tool for people at present. The main component of the electronic device for implementing the display function is a display panel, and nowadays, the display panel mainly includes a liquid crystal display panel, an organic light emitting display panel, and the like. However, the gray scale of the display image of the conventional display panel cannot be precisely controlled, so that the display effect of the display image is poor.
Disclosure of Invention
In view of the above, the present invention provides a driving circuit, a light emitting device and a display apparatus to improve the control accuracy of the gray scale of the display screen.
In order to achieve the purpose, the invention provides the following technical scheme:
a driving circuit comprises a gating module, a storage module and a driving switch;
the first input end of the gating module is connected with the data signal end, the second input end of the gating module is connected with the reference signal end, the third input end of the gating module is connected with the scanning signal end, and the first output end of the gating module is connected with the first end of the storage module;
the gating module transmits a data signal input by the data signal terminal to the storage module in a first time period under the control of a scanning signal input by the scanning signal terminal, and transmits a reference signal input by the reference signal terminal to the storage module in a second time period, so that the data signal and the reference signal are superposed at the storage module and a driving signal is generated;
the control end of the driving switch receives the driving signal, the first end of the driving switch is connected with the first end of the light-emitting device, the second end of the driving switch is connected with the first reference voltage end, and the second end of the light-emitting device is connected with the second reference voltage end;
and if the voltage of the driving signal is greater than or equal to the starting voltage of the driving switch, the driving switch is started and controls the light-emitting device to emit light.
A light emitting assembly comprises a light emitting unit, wherein the light emitting unit comprises a driving circuit and a light emitting device, and the driving circuit is connected with the light emitting device;
the drive circuit is as described in any one of the above.
A display device comprising a light emitting assembly as claimed in any one of the above.
Compared with the prior art, the technical scheme provided by the invention has the following advantages:
according to the driving circuit, the light-emitting component and the display device provided by the invention, the driving circuit generates the driving signal by superposing the data signal and the reference signal at the storage module, so that the pulse width of the generated driving signal can be adjusted by adjusting the pulse width of the reference signal, the opening time of the driving switch can be adjusted by adjusting the pulse width of the driving signal, the light-emitting time of the light-emitting device can be adjusted by adjusting the opening time of the driving switch, and the total brightness of the light-emitting device in a light-emitting period can be adjusted by adjusting the light-emitting time of the light-emitting device. That is to say, in the embodiment of the present invention, the total brightness of the light emitting device can be accurately controlled by the reference signal, so that the accurate control of the gray scale of the display image can be realized, which is more favorable for improving the display effect of the display image.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention;
FIG. 2 is a timing diagram of signals of a driving circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a driving circuit according to another embodiment of the present invention;
FIG. 4 is a timing diagram of signals of a driving circuit according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a driving circuit according to another embodiment of the invention;
fig. 6 is a schematic structural diagram of a driving circuit according to another embodiment of the present invention;
FIG. 7 is a timing diagram of signals of a driving circuit according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a driving circuit according to another embodiment of the invention;
fig. 9 is a schematic top view of a light-emitting device according to an embodiment of the present invention;
fig. 10 is a schematic cross-sectional view illustrating a light-emitting device, i.e., a backlight module, according to an embodiment of the present invention;
fig. 11 is a schematic cross-sectional view illustrating a display panel as a light emitting device according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 13 is a schematic cross-sectional view of a display device according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that the above is the core idea of the present invention, and the above objects, features and advantages of the present invention can be more clearly understood. 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 invention.
The driving circuit provided by the embodiment of the invention is used for driving the light emitting device to emit light, and the light emitting device comprises an LED light emitting device, such as a Micro-LED and a Mini-LED. As shown in fig. 1, fig. 1 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention, where the driving circuit includes a gating module 10, a storage module 11, and a driving switch 12.
A first input terminal of the gating module 10 is connected to the data signal terminal SS, a second input terminal of the gating module 10 is connected to the reference signal terminal REF, a third input terminal of the gating module 10 is connected to the SCAN signal terminal SCAN, and a first output terminal of the gating module 10 is connected to the first terminal of the memory module 11.
The gate module 10 transmits the Data signal Data input from the Data signal terminal SS to the memory module 11 in a first period and transmits the reference signal REF input from the reference signal terminal REF to the memory module 11 in a second period under the control of the SCAN signal SCAN input from the SCAN signal terminal SCAN, so that the Data signal Data and the reference signal REF are superimposed at the memory module 11 and generate the driving signal.
The control terminal of the driving switch 12 receives the driving signal, the first terminal of the driving switch 12 is connected to the first terminal of the light emitting device 13, the second terminal of the driving switch 12 is connected to the first reference voltage terminal PVEE, and the second terminal of the light emitting device 13 is connected to the second reference voltage terminal PVDD. If the voltage of the driving signal is greater than or equal to the turn-on voltage of the driving switch 12, the driving switch 12 turns on and controls the light emitting device 13 to emit light.
In some embodiments of the invention, the voltage of the second reference voltage terminal PVDD is greater than the voltage of the first reference voltage terminal PVEE, and optionally, the first reference voltage terminal PVEE is a ground terminal.
It should be noted that when the voltage of the second reference voltage terminal PVDD is greater than the voltage of the first reference voltage terminal PVEE, the anode of the light emitting device 13, i.e., the light emitting diode, is connected to the second reference voltage terminal PVDD, and when the voltage of the second reference voltage terminal PVDD is less than the voltage of the first reference voltage terminal PVEE, the cathode of the light emitting device 13, i.e., the light emitting diode, is connected to the second reference voltage terminal PVDD.
In some embodiments of the present invention, the gating module 10 is a gate, but the present invention is not limited thereto, and in other embodiments, the gating module 10 may also be a logic circuit formed by a logic gate or the like. In some embodiments of the present invention, the storage module 11 is a storage capacitor, and the driving switch 12 is a PMOS transistor, but the present invention is not limited thereto, and in other embodiments, the driving switch 12 may also be an NMOS transistor, and the like, which is not described herein again.
Next, a driving process of the driving circuit will be described by taking the gating module 10 as a gate and the storage module 11 as a storage capacitor as an example.
As shown in fig. 2, fig. 2 is a signal timing diagram of the driving circuit according to an embodiment of the invention, in a first period T1, the Scan signal Scan is at a low level, the gating module 10, such as the gate selection output terminal, is connected to the Data signal terminal SS, and transmits the Data signal Data to the storage module 11, so that the Data signal Data charges the storage module 11, such as the storage capacitor C, and the voltage Vc across the storage capacitor C is the first voltage V1. In a second period T1, the Scan signal Scan is at a high level, the gating module 10, such as a gate select output, is coupled to the reference signal terminal REF, and transmits the reference signal REF to the memory module 11, so that the reference signal REF charges the memory module 11, such as the storage capacitor C.
In some embodiments of the present invention, the reference signal Ref is a triangular wave signal, and a maximum value of the reference signal Ref is greater than the first voltage V1 and a minimum value of the reference signal Ref is less than the first voltage V1. Based on this, after the Data signal Data is superimposed with the reference signal Ref, the voltage Vc across the storage capacitor C in the first sub-period T21 may be greater than the first voltage V1, and the voltage Vc across the storage capacitor C in the second sub-period T22 may be less than the first voltage V1, so that the voltage Vc across the storage capacitor C in the second sub-period T2 may be a voltage signal with a periodically changing high and low levels.
In some embodiments of the present invention, the periodically varying voltage signal may be directly used as a driving signal and transmitted to the control terminal of the driving switch 12. When the voltage Vc across the storage capacitor C is greater than or equal to the turn-on voltage of the driving switch 12, the driving switch 12 turns on to control the light emitting device 13 to emit light, and when the voltage Vc across the storage capacitor C is less than the turn-on voltage of the driving switch 12, the driving switch 12 turns off to control the light emitting device 13 not to emit light. It should be noted that the magnitude of the current flowing through the light emitting device 13 is determined by the voltage of the first reference voltage terminal PVEE and the voltage of the second reference voltage terminal PVDD.
It should be noted that, in the embodiment of the present invention, the magnitude of the voltage Vc across the storage capacitor C may be controlled by controlling the amplitude, i.e. the maximum value and the minimum value, of the triangular wave signal, so as to ensure that the voltage Vc across the storage capacitor C is greater than or equal to the turn-on voltage of the driving switch 12 in the first sub-period T21 and is less than the turn-on voltage of the driving switch 12 in the second sub-period T22. It should be noted that the reference signal Ref in the embodiment of the present invention is not limited to a triangular wave signal, and in other embodiments, it may also be a sine wave signal or a square wave signal.
In the embodiment of the present invention, the driving circuit generates the driving signal by superimposing the Data signal Data and the reference signal Ref at the storage module 11, so that the pulse width of the generated driving signal can be adjusted by adjusting the pulse width of the reference signal Ref, the on-time of the driving switch 12 can be adjusted by adjusting the pulse width of the driving signal, the light-emitting time of the light-emitting device 13 can be adjusted by adjusting the on-time of the driving switch 12, and the total brightness of the light-emitting device 13 in one light-emitting period can be adjusted by adjusting the light-emitting time of the light-emitting device 13. That is to say, in the embodiment of the present invention, the total brightness of the light emitting device 13 can be accurately controlled by the reference signal Ref, so that the accurate control of the gray scale of the display image can be realized, which is more favorable for improving the display effect of the display image.
On the basis of any of the foregoing embodiments, in some embodiments of the present invention, as shown in fig. 3, fig. 3 is a schematic structural diagram of a driving circuit according to another embodiment of the present invention, and the driving circuit further includes a signal generating module 14.
The input end of the signal generating module 14 is connected to the first end or the second end of the storage module 11, the output end of the signal generating module 14 is connected to the control end of the driving switch 12, and the signal generating module 14 generates the driving signal P according to the voltage of the storage module 11 and transmits the driving signal P to the control end of the driving switch 12.
That is to say, in the embodiment of the present invention, the periodically varying voltage signal obtained by the storage module 11 may be directly used as the driving signal, or the signal generation module 14 may obtain the driving signal according to the periodically varying voltage signal obtained by the storage module 11, as shown in fig. 4, fig. 4 is a signal timing diagram of a driving circuit according to another embodiment of the present invention, and the driving signal P is a periodically varying square wave signal. For example, the driving signal P may be a PWM (Pulse width modulation) signal.
As shown in fig. 4, the voltage of the square wave signal is the second voltage V2 in the first sub-period T21, the voltage of the square wave signal is the third voltage V3 in the second sub-period T22, and the second voltage V2 is greater than the third voltage V3. The second voltage V2 is greater than or equal to the turn-on voltage of the driving switch 12, and the third voltage V3 is less than the turn-on voltage of the driving switch 12. Since the second voltage V2 is greater than or equal to the turn-on voltage of the driving switch 12, the driving switch 12 turns on and controls the light emitting device 13 to emit light for the first sub-period T21. Since the third voltage V3 is less than the turn-on voltage of the driving switch 12, the driving switch 12 is turned off and controls the light emitting device 13 not to emit light for the second sub-period T22.
Also, since the pulse width of the square wave signal is determined by the pulse width of the periodically varying voltage signal obtained by the memory module 11, the light emitting time period of the light emitting device 13 can be adjusted by adjusting the turn-on time period of the driving switch 12, and the total brightness of the light emitting device 13 in one light emitting period can be adjusted by adjusting the light emitting time period of the light emitting device 13. In addition, since the voltage of the driving signal P shown in fig. 4 is substantially unchanged at any time interval, the state of the driving switch 12 can be more accurately controlled, the influence of the voltage value change on the state of the driving switch 12 is avoided, the total brightness of the light emitting device 13 can be more accurately controlled, the gray scale of the display image can be more accurately controlled, and the display effect of the display image can be more favorably improved.
In some embodiments of the present invention, as shown in fig. 3, the signal generation module 14 includes a first operational amplifier OP 1.
The first input terminal of the first operational amplifier OP1 is connected to the second terminal of the memory module 11, the second input terminal of the first operational amplifier OP1 is connected to the second output terminal of the gating module 10, the second output terminal of the gating module 10 outputs the reference voltage Vref, and the output terminal of the first operational amplifier OP1 is connected to the control terminal of the driving switch 12. The first operational amplifier OP1 compares the voltage Vc of the second terminal of the memory module 11 with the reference voltage Vref to generate the driving signal P.
As shown in fig. 4, in the first sub-period T21, the voltage Vc of the second terminal of the memory module 11, e.g., the storage capacitor C, is greater than or equal to the reference voltage Vref, the voltage of the driving signal P is the second voltage V2, in the second sub-period T22, the voltage Vc of the second terminal of the memory module 11, e.g., the storage capacitor C, is less than the reference voltage Vref, and the voltage of the driving signal P is the third voltage V3.
Certainly, the present invention is not limited thereto, and in another embodiment, as shown in fig. 5, fig. 5 is a schematic structural diagram of a driving circuit according to another embodiment of the present invention, wherein the signal generating module 14 includes a second operational amplifier OP 2.
A first input terminal of the second operational amplifier OP2 is connected to a first terminal of the memory module 11, a second input terminal of the second operational amplifier OP2 is connected to a second output terminal of the gating module 10, a second output terminal of the gating module 10 outputs the reference voltage Vref, a second terminal of the memory module 11 is connected to the first reference voltage terminal PVEE, and an output terminal of the operational amplifier OP2 is connected to a control terminal of the driving switch 12. The second operational amplifier OP2 compares the voltage of the first terminal of the memory module 11 with the reference voltage Vref to generate the driving signal P.
As shown in fig. 4, in the first sub-period T21, the voltage Vc of the first terminal of the memory module 11, such as the storage capacitor C, is greater than or equal to the reference voltage Vref, the voltage of the driving signal P is the second voltage V2, the voltage Vc of the first terminal of the memory module 11, such as the storage capacitor C, is less than the reference voltage Vref, and the voltage of the driving signal P is the third voltage V3 in the second sub-period T22.
In the structure shown in fig. 5, the second terminal of the storage module 11 is connected to the first reference voltage terminal PVEE, so that when the zeroing module 15 clears the charges in the storage module 11, the voltage across the storage module 11, that is, the storage capacitor C, is low, and the zeroing speed or the resetting speed of the storage module 11 can be accelerated.
In another embodiment of the present invention, as shown in fig. 6, fig. 6 is a schematic structural diagram of a driving circuit according to another embodiment of the present invention, and the signal generating module 14 includes a first switch K1 and a first resistor R1.
Alternatively, the first switch K1 has the opposite conduction type to that of the driving switch 12, and the first switch K1 is an NMOS transistor if the driving switch 12 is a PMOS transistor. Of course, the invention is not limited thereto, and in other embodiments, the conduction types of the first switch K1 and the driving switch 12 may be the same, i.e. both are PMOS transistors or both are NMOS transistors.
A control end of the first switch K1 is connected to the second end or the first end of the memory module 11, a first end of the first switch K1 is connected to a first end of the first resistor R1, a second end of the first switch K1 is connected to the first reference voltage end PVEE, and a second end of the first resistor R1 is connected to the second reference voltage end PVDD; the common terminal S of the first switch K1 and the first resistor R1 is connected to the control terminal of the driving switch 12.
Under the control of the voltage at the second terminal or the first terminal of the memory module 11, the first switch K1 transmits the voltage at the first reference voltage terminal PVEE or the voltage at the second reference voltage terminal PVDD to the control terminal of the driving switch 12, so as to generate the driving signal.
Taking the first switch K1 as an NMOS transistor for example, as shown in fig. 7, fig. 7 is a signal timing diagram of a driving circuit according to another embodiment of the invention, where in a first sub-period T21, a voltage Vc of a first end or a second end of the memory module 11, such as a storage capacitor C, is greater than or equal to an on-voltage of the first switch K1, the first switch K1 turns on to transmit a first reference voltage end PVEE, i.e., a third voltage V3, to a control end of the driving switch 12, and in a second sub-period T22, the voltage Vc of the first end or the second end of the memory module 11, such as the storage capacitor C, is less than the on-voltage of the first switch K1, the first switch K1 turns off, and a second reference voltage end PVDD, i.e., a second voltage V2, is transmitted to the control end of the driving switch 12 through a first resistor R1.
It should be noted that the driving signal P1 shown in fig. 7 is the opposite signal to the driving signal P shown in fig. 4, but the present invention is not limited thereto, and the driving signal P1 shown in fig. 6 can be the same as the driving signal P shown in fig. 4 by changing the type of the first switch K1 or changing the voltages of the second reference voltage terminal PVDD and the first reference voltage terminal PVEE. That is, a desired driving signal may be obtained by setting the type of the first switch K1, the voltages of the second reference voltage terminal PVDD and the first reference voltage terminal PVEE, and the like. Although the driving signal P1 shown in fig. 7 is a signal opposite to the driving signal P in fig. 4, the pulse widths of the two are the same, and the driving effect of the light emitting device 13 finally obtained is the same.
In other embodiments of the present invention, as shown in fig. 8, fig. 8 is a schematic structural diagram of a driving circuit according to another embodiment of the present invention, and the signal generating module 14 includes a second switch K2 and a third switch K3. Alternatively, the second switch K2 is of the opposite conduction type to the drive switch 12, and the third switch K3 is of the same conduction type as the drive switch 12. Of course, the present invention is not limited to this, and the second switch K2, the third switch K3 and the driving switch 12 may be PMOS transistors or NMOS transistors as required in practical applications.
A control terminal of the second switch K2 is connected to the second terminal or the first terminal of the memory module 11, a first terminal of the second switch K2 is connected to the second terminal of the third switch K3, and a second terminal of the second switch K2 is connected to the second reference voltage terminal PVDD; a first terminal of the third switch K3 is connected to the first reference voltage terminal PVEE, and a control terminal of the third switch K3 is connected to the SCAN signal terminal SCAN.
Under the control of the voltage of the second terminal of the memory module 11 and the Scan signal Scan, the second switch K2 and the third switch K3 transmit the voltage of the first reference voltage terminal PVEE or the voltage of the second reference voltage terminal PVDD to the control terminal of the driving switch 12, generating the driving signal.
Taking the second switch K2 as an NMOS transistor and the third switch K3 as a PMOS transistor as an example, referring to fig. 4, in the first sub-period T21, the Scan signal Scan is at a high level, the voltage Vc of the second end of the memory module 11 is greater than the turn-on voltage of the third switch K3, the second switch K2 is turned on, the third switch K3 is turned off, the second reference voltage end PVDD, i.e., the second voltage V2, is transmitted to the control end of the driving switch 12, in the second sub-period T22, the Scan signal Scan is at a high level, the voltage Vc of the second end of the memory module 11 is less than or equal to the turn-on voltage of the third switch K3, the second switch K2 is turned on, the third switch K3 is turned on, and the voltage of the first reference voltage end PVEE, i.e., the third voltage V3, is transmitted to the control end of the driving switch 12.
It should be noted that, in the embodiment of the present invention, only several structures of the signal generating module 14 are taken as examples for description, but the present invention is not limited thereto, and it is within the scope of the present invention as long as the signal generating module 14 generates the driving signal P according to the voltage of the storage module 11.
In any embodiment of the present invention, as shown in fig. 3, the driving circuit further includes a zero module 15. The zero clearing module 15 clears the charges in the memory module 11 under the control of the Scan signal Scan.
As shown in fig. 2 or fig. 4, when the Scan signal Scan is at a low level, the charges in the memory module 11 are cleared first, and then the Data signal Data is stored in the memory module 11, so as to prevent the charges stored in the memory module 11 at the previous time from affecting the charges to be stored at the next time.
In some embodiments of the present invention, as shown in FIG. 3, the zeroing module 15 includes a fourth switch K4.
Optionally, the fourth switch K4 and the driving switch 12 have opposite conduction types, that is, when the driving switch 12 is a PMOS transistor, the fourth switch K4 is an NMOS transistor, and when the driving switch 12 is an NPMOS transistor, the fourth switch K4 is a PMOS transistor, although the invention is not limited thereto, in other embodiments, the conduction types of the fourth switch K4 and the driving switch 12 may also be the same, and are not described herein again.
As shown in fig. 3, a control terminal of the fourth switch K4 is connected to the SCAN signal terminal SCAN, a first terminal of the fourth switch K4 is connected to the first terminal or the second terminal of the memory module 11, and a second terminal of the fourth switch K4 is connected to the first reference voltage terminal PVEE.
In some embodiments of the present invention, the fourth switch K4 is a PMOS transistor, the first reference voltage terminal PVEE is a ground terminal, and when the Scan signal Scan is low, the fourth switch K4 is turned on, so that the first terminal or the second terminal of the memory module 11 is connected to the first reference voltage terminal PVEE, i.e., the ground terminal, thereby clearing the charges in the memory module 11.
Fig. 9 is a schematic structural diagram of a light emitting assembly according to an embodiment of the present invention, where the light emitting assembly includes a light emitting unit 20, the light emitting unit 20 includes a driving circuit 21 and a light emitting device 22, and the driving circuit 21 is connected to the light emitting device 22; the driving circuit 21 is the driving circuit provided in any of the above embodiments.
In some embodiments of the present invention, the light emitting device is a backlight module and is a direct-type backlight module, as shown in fig. 10, fig. 10 is a schematic cross-sectional structure diagram of the light emitting device, that is, a backlight module according to an embodiment of the present invention, where the backlight module is disposed opposite to a liquid crystal display panel, the liquid crystal display panel has pixel units thereon, and the light emitting device 22 in the backlight module is used to provide a backlight source for the pixel units in the liquid crystal display panel.
In this case, the Data signal Data received by the driving circuit in the backlight module may be a Data signal of a display screen input from the outside, or a Data signal for controlling the backlight source generated by the driving chip in the display device according to the Data signal of the display screen. That is to say, the driving circuit in this embodiment may control the light-emitting luminance of the light-emitting device 22 by superimposing the data signal of the display screen and the reference signal Ref to generate the driving signal, and further control the gray scale of the display screen, or may generate the data signal for controlling the backlight source by processing the data signal of the display screen through the driving chip, and further superimpose the data signal for controlling the backlight source and the reference signal Ref to generate the driving signal, so as to control the light-emitting luminance of the light-emitting device 22, and further control the gray scale of the display screen.
Since the driving circuit can drive the plurality of light emitting devices 22 and the driving chip can drive the plurality of driving circuits, compared with the scheme of driving the light emitting devices only through the driving chip in the prior art, the embodiment of the invention can reduce the number of the required driving chips by arranging the driving circuit, thereby reducing the cost of the display panel and the display device. On this basis, in the embodiment of the present invention, a greater number of light emitting devices 22 may also be driven, that is, each light emitting device 22 may provide a backlight source to a smaller number of pixel units, so that the gray scale of each pixel unit may be accurately controlled, and the display effect of the display screen may be further improved.
Of course, the present invention is not limited to this, in other embodiments, as shown in fig. 11, fig. 11 is a schematic cross-sectional structure diagram of a display panel, which is a light emitting device according to an embodiment of the present invention, the light emitting device is a display panel capable of emitting light actively, one light emitting unit 20 on the display panel constitutes one pixel unit, a driving chip on the display panel generates a Scan signal Scan and a Data signal Data according to a Data signal of a display screen input from the outside, and controls a driving circuit to generate a driving signal through the Scan signal Scan, the Data signal Data and a reference signal Ref, so as to control the light emitting brightness of the light emitting device 22, and further control the gray scale of the display screen.
In the backlight module shown in fig. 10 and the display panel shown in fig. 11, the light emitting device 22 may be a light emitting device directly fabricated on a substrate by a process such as plating, or may be a light emitting device fabricated and then soldered on the substrate. For example, the light emitting devices may include Micro light emitting diodes Micro-LEDs, and sub light emitting diodes Mini-LEDs, etc.
On the basis of any of the above embodiments, in some embodiments of the present invention, as shown in fig. 9, the light emitting assembly includes a plurality of light emitting cells 20, the plurality of light emitting cells 20 are arranged in an array, the light emitting assembly further includes a plurality of SCAN signal lines SCAN1 to SCANn, n is an integer greater than 1; each of the SCAN signal lines is connected to a SCAN signal terminal SCAN of the driving circuit in one row of the light emitting cells 20.
Based on this, the Scan signal Scan can be input into the light emitting units 20 row by row, and the Data signal Data is input to all the light emitting units 20 of each row when the light emitting units 20 of the row receive the Scan signal Scan. Of course, the present invention is not limited to this, and in other embodiments, when each row of light emitting units 20 receives the Scan signal Scan, the Data signals Data may be sequentially input to the light emitting units 20 in the row. It should be noted that, in some embodiments of the present invention, the reference signal Ref provided to all the light emitting units 20 is the same signal. Based on this, in some embodiments of the present invention, the light emitting assembly further comprises a reference signal generating circuit; the reference signal generating circuit is used for generating a reference signal Ref and transmitting the reference signal Ref to a reference signal terminal REF of the driving circuit. Of course, the present invention is not limited thereto, and in another embodiment, the light emitting component may not include the reference signal generating circuit, i.e., it may obtain the reference signal REF from an external device by connecting the reference signal terminal REF to the external device.
On the basis of any of the above embodiments, in some embodiments of the present invention, as shown in fig. 9, the light emitting assembly includes a plurality of first voltage signal lines PVEE1 to PVEEn and a plurality of second voltage signal lines PVDD1 to PVDDn, each of the first voltage signal lines is connected to the first reference voltage terminal PVEE of the driving circuit in one row of the light emitting cells 20, and each of the second voltage signal lines is connected to the second reference voltage terminal PVDD of the driving circuit in one row of the light emitting cells 20, so as to reduce parasitic capacitance of the voltage signal lines by disposing the plurality of first voltage signal lines PVEE1 to PVEEn and the plurality of second voltage signal lines PVDD1 to PVDDn, thereby reducing influence of the parasitic capacitance on the light emitting performance of the light emitting device 22.
Of course, the present invention is not limited thereto, and in other embodiments, one first voltage signal line and one second voltage signal line may be used without considering the influence on the light emitting performance of the light emitting device 22.
It should be noted that the plurality of first voltage signal lines PVEE1 to PVEEn and the plurality of second voltage signal lines PVDD1 to PVDDn are routed with the maximum line width limited by space, so as to reduce the resistance of the signal lines as much as possible and reduce the loss of signals on the signal lines.
The embodiment of the invention also provides a display device which comprises the light-emitting component provided by any one of the above embodiments. As shown in fig. 12, fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present invention, where the display device Z includes, but is not limited to, a full-screen mobile phone, a tablet computer, a digital camera, and the like.
It should be noted that the display device in the embodiment of the present invention may be a liquid crystal display device, and may also be an LED or OLED display device. When the display device is a liquid crystal display device, the light-emitting component is a backlight module in the liquid crystal display device, when the display device is an LED or OLED display device, the light-emitting component is a display panel in the LED or OLED display device, and in addition, when the display device is an LED display device, the light-emitting device can comprise a Micro-LED, a Mini-LED and the like.
When the light emitting device is a backlight module, as shown in fig. 13, fig. 13 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention, and the display device further includes a display panel 3 disposed opposite to the backlight module 2. The display panel 3 includes a plurality of pixel units, and the light emitting unit 20 in the backlight module 2 provides light sources to the plurality of pixel units in the display panel 3.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (14)

1. A driving circuit is characterized by comprising a gating module, a storage module and a driving switch;
the first input end of the gating module is connected with the data signal end, the second input end of the gating module is connected with the reference signal end, the third input end of the gating module is connected with the scanning signal end, and the first output end of the gating module is connected with the first end of the storage module;
the gating module transmits a data signal input by the data signal terminal to the storage module in a first time period under the control of a scanning signal input by the scanning signal terminal, and transmits a reference signal input by the reference signal terminal to the storage module in a second time period, so that the data signal and the reference signal are superposed at the storage module and a driving signal is generated;
the control end of the driving switch receives the driving signal, the first end of the driving switch is connected with the first end of the light-emitting device, the second end of the driving switch is connected with the first reference voltage end, and the second end of the light-emitting device is connected with the second reference voltage end;
if the voltage of the driving signal is greater than or equal to the starting voltage of the driving switch, the driving switch is started and controls the light-emitting device to emit light;
the device also comprises a signal generating module; the input end of the signal generation module is connected with the first end or the second end of the storage module, the output end of the signal generation module is connected with the control end of the driving switch, and the signal generation module generates the driving signal according to the voltage of the storage module and transmits the driving signal to the control end of the driving switch.
2. The driving circuit of claim 1, wherein the reference signal is a triangular wave signal.
3. The driving circuit of claim 1, wherein the signal generation module comprises a first operational amplifier;
the first input end of the first operational amplifier is connected with the second end of the storage module, the second input end of the first operational amplifier is connected with the second output end of the gating module, the second output end of the gating module outputs reference voltage, and the output end of the first operational amplifier is connected with the control end of the driving switch;
the first operational amplifier compares the voltage of the second end of the storage module with the reference voltage and then generates the driving signal.
4. The driving circuit of claim 1, wherein the signal generation module comprises a second operational amplifier;
the first input end of the second operational amplifier is connected with the first end of the storage module, the second input end of the second operational amplifier is connected with the second output end of the gating module, the second output end of the gating module outputs reference voltage, the second end of the storage module is connected with the first reference voltage end, and the output end of the operational amplifier is connected with the control end of the driving switch;
the second operational amplifier compares the voltage of the first end of the storage module with the reference voltage and then generates the driving signal.
5. The driving circuit according to claim 1, wherein the signal generating module comprises a first switch and a first resistor;
a control end of the first switch is connected with a second end or a first end of the memory module, the first end of the first switch is connected with a first end of the first resistor, the second end of the first switch is connected with the first reference voltage end, and the second end of the first resistor is connected with the second reference voltage end; the common end of the first switch and the first resistor is connected with the control end of the driving switch;
the first switch transmits the voltage of the first reference voltage terminal or the voltage of the second reference voltage terminal to the control terminal of the driving switch under the control of the voltage of the second terminal of the memory module.
6. The driving circuit of claim 1, wherein the signal generation module comprises a second switch and a third switch;
the control end of the second switch is connected with the second end or the first end of the storage module, the first end of the second switch is connected with the second end of the third switch, and the second end of the second switch is connected with the second reference voltage end;
the first end of the third switch is connected with the first reference voltage end, and the control end of the third switch is connected with the scanning signal end;
the second switch and the third switch transmit the voltage of the first reference voltage terminal or the voltage of the second reference voltage terminal to the control terminal of the driving switch under the control of the voltage of the second terminal of the memory module and the scan signal.
7. The driving circuit of claim 1, further comprising a zero module;
and the zero clearing module is used for clearing the charges in the storage module under the control of the scanning signal.
8. The driving circuit of claim 7, wherein the zeroing module comprises a fourth switch;
the control end of the fourth switch is connected with the scanning signal end, the first end of the fourth switch is connected with the first end or the second end of the storage module, and the second end of the fourth switch is connected with the first reference voltage end.
9. A light emitting assembly, comprising a light emitting unit, wherein the light emitting unit comprises a driving circuit and a light emitting device, the driving circuit is connected with the light emitting device;
the drive circuit according to any one of claims 1 to 8.
10. The lighting assembly of claim 9, further comprising a reference signal generating circuit;
the reference signal generating circuit is used for generating a reference signal and transmitting the reference signal to a reference signal end of the driving circuit.
11. The lighting assembly according to claim 9,
the light-emitting units are arranged in an array, and the light-emitting assembly further comprises a plurality of scanning signal lines;
each scanning signal line is connected with a scanning signal end of a driving circuit in a row of light emitting units.
12. The light emitting assembly of claim 9, comprising a plurality of first voltage signal lines each connected to the first reference voltage terminals of the driving circuits in a row of the light emitting cells and a plurality of second voltage signal lines each connected to the second reference voltage terminals of the driving circuits in a row of the light emitting cells.
13. A display device comprising the light-emitting element according to any one of claims 9 to 12.
14. The display device according to claim 13, wherein the light emitting element is a backlight module, and the display device further comprises a display panel disposed opposite to the backlight module;
the display panel comprises a plurality of pixel units, and the light-emitting units in the backlight module provide light sources for the pixel units in the display panel.
CN202110365402.1A 2021-04-06 2021-04-06 Drive circuit, light-emitting component and display device Active CN112967681B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110365402.1A CN112967681B (en) 2021-04-06 2021-04-06 Drive circuit, light-emitting component and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110365402.1A CN112967681B (en) 2021-04-06 2021-04-06 Drive circuit, light-emitting component and display device

Publications (2)

Publication Number Publication Date
CN112967681A CN112967681A (en) 2021-06-15
CN112967681B true CN112967681B (en) 2022-07-19

Family

ID=76281156

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110365402.1A Active CN112967681B (en) 2021-04-06 2021-04-06 Drive circuit, light-emitting component and display device

Country Status (1)

Country Link
CN (1) CN112967681B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230093616A (en) 2021-12-20 2023-06-27 엘지디스플레이 주식회사 Subpixel circuit, display panwel and display device
KR20230093619A (en) * 2021-12-20 2023-06-27 엘지디스플레이 주식회사 Subpixel circuit, display panwel and display device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106448560A (en) * 2016-12-21 2017-02-22 上海天马有机发光显示技术有限公司 Organic light emitting display panel and driving method thereof, and organic light emitting display device
CN106782332A (en) * 2017-01-19 2017-05-31 上海天马有机发光显示技术有限公司 Organic electroluminescence display panel and its driving method, organic light-emitting display device
CN108665852A (en) * 2018-07-23 2018-10-16 京东方科技集团股份有限公司 Pixel circuit, driving method, organic light emitting display panel and display device
CN111968568A (en) * 2020-09-03 2020-11-20 上海天马微电子有限公司 Light-emitting panel and display device
CN112233607A (en) * 2020-09-11 2021-01-15 成都辰显光电有限公司 Digital pixel driving circuit, driving method thereof and display panel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106448560A (en) * 2016-12-21 2017-02-22 上海天马有机发光显示技术有限公司 Organic light emitting display panel and driving method thereof, and organic light emitting display device
CN106782332A (en) * 2017-01-19 2017-05-31 上海天马有机发光显示技术有限公司 Organic electroluminescence display panel and its driving method, organic light-emitting display device
CN108665852A (en) * 2018-07-23 2018-10-16 京东方科技集团股份有限公司 Pixel circuit, driving method, organic light emitting display panel and display device
CN111968568A (en) * 2020-09-03 2020-11-20 上海天马微电子有限公司 Light-emitting panel and display device
CN112233607A (en) * 2020-09-11 2021-01-15 成都辰显光电有限公司 Digital pixel driving circuit, driving method thereof and display panel

Also Published As

Publication number Publication date
CN112967681A (en) 2021-06-15

Similar Documents

Publication Publication Date Title
US10672334B2 (en) Organic light-emitting display panel, method for driving the same, and organic light-emitting display device
CN112581902B (en) Pixel driving circuit, pixel unit, driving method, array substrate and display device
KR20200057785A (en) Driving circuit and driving method thereof, and display device
US9324271B2 (en) Pixel driver
CN111477162B (en) Pixel circuit, driving method thereof and display device
CN111243498B (en) Pixel circuit, driving method thereof and display device
CN112967681B (en) Drive circuit, light-emitting component and display device
US10977984B2 (en) Pixel circuit and driving method thereof, display panel and video wall
EP3588480B1 (en) Pixel driving circuit and driving method thereof, and layout structure of transistor
CN100576296C (en) Driving arrangement, comprise the display device of this equipment and drive the method for this device
US11257423B2 (en) Pixel driving circuit and driving method thereof, and display panel
US11263938B1 (en) Light-emitting panel and display device
US11538405B2 (en) Pixel driving circuit, pixel driving method, display panel and display device
US20240127756A1 (en) Pixel Driving Circuit, Pixel Driving Method, Display Panel and Display Device
CN113707079A (en) Pixel circuit and display panel
CN114203103B (en) Light-emitting circuit, backlight module and display panel
US11335228B1 (en) Scanning signal circuit, display panel, display device, and driving method
CN114093301B (en) Display device, pixel driving circuit and driving method thereof
CN113971936B (en) Display panel and driving method thereof
US11302245B2 (en) Pixel circuit, driving method thereof, and display device
CN112992064B (en) Light-emitting circuit, light-emitting component and display device
US20220223118A1 (en) Gamma circuit, method for driving the same, and display panel
US11322076B2 (en) Pixel driving chip and driving method therefor, and display apparatus
CN110136672B (en) Display panel, driving method thereof and display device
CN114639347A (en) Pixel driving circuit, driving method and display device

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
GR01 Patent grant