CN112992064B - Light-emitting circuit, light-emitting component and display device - Google Patents

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

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Publication number
CN112992064B
CN112992064B CN202110382563.1A CN202110382563A CN112992064B CN 112992064 B CN112992064 B CN 112992064B CN 202110382563 A CN202110382563 A CN 202110382563A CN 112992064 B CN112992064 B CN 112992064B
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signal
light
resistor
light emitting
operational amplifier
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CN112992064A (en
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东强
孙晓平
马从华
王丽花
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Shanghai Tianma Microelectronics Co Ltd
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Shanghai Tianma Microelectronics Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • G09G3/3406—Control of illumination source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • 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 light-emitting circuit, a light-emitting component and a display device, which comprise a signal processing module, a signal generating module and a light-emitting unit, wherein the signal processing module is connected with the signal generating module; the signal processing module receives the first data signal, converts the first data signal into a second data signal with the voltage larger than zero, and transmits the second data signal to the signal generating module; the signal generating module generates a driving signal according to the second data signal to control the light-emitting unit to emit light through the driving signal. The second data signal is a signal with the voltage larger than zero, so that the generated driving signal is also a signal with the voltage larger than zero, the control of the light-emitting unit is more accurate, the accurate control of the gray scale of the display picture can be realized, and the display effect of the display picture can be improved.

Description

Light-emitting circuit, light-emitting component and display device
Technical Field
The present invention relates to the field of display technologies, and in particular, to a light emitting circuit, a light emitting module, 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 the display panel nowadays mainly includes a liquid crystal display panel, an organic light emitting display panel, and the like. Although the display panel of the present invention has the advantages of low power consumption, high brightness, and high resolution, the display effect of the display screen of the display panel still needs to be further improved.
Disclosure of Invention
In view of the above, the present invention provides a light emitting circuit, a light emitting assembly and a display device to further improve the display effect of a display screen.
In order to achieve the purpose, the invention provides the following technical scheme:
a light-emitting circuit comprises a signal processing module, a signal generating module and a light-emitting unit, wherein the signal processing module is connected with the signal generating module, and the light-emitting unit is connected with the signal generating module;
the signal processing module receives a first data signal, converts the first data signal into a second data signal with voltage larger than zero, and transmits the second data signal to the signal generating module;
the signal generation module generates a driving signal according to the second data signal so as to control the light emitting unit to emit light through the driving signal.
A light emitting assembly comprising a light emitting circuit, the light emitting circuit being as claimed in any one of the above;
the light emitting circuit includes at least one light emitting cell; the plurality of light emitting units are arranged in an array.
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 light-emitting circuit, the light-emitting component and the display device, the first data signal is converted into the second data signal with the voltage larger than zero through the signal processing module, the signal generating module generates the driving signal according to the second data signal, and the light-emitting unit is controlled to emit light through the driving signal. The second data signal is a signal with the voltage larger than zero, so that the generated driving signal is also a signal with the voltage larger than zero, the control of the light-emitting unit is more accurate, the accurate control of the gray scale of the display picture can be realized, and the further improvement of the display effect of the display picture is facilitated.
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 light emitting circuit according to an embodiment of the present invention;
FIG. 2 is a waveform diagram of a first data signal and a second data signal according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a signal processing module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the signal processing module shown in FIG. 3 in one case;
FIG. 5 is a schematic diagram of another embodiment of the signal processing module shown in FIG. 3;
fig. 6 is a schematic structural diagram of a signal generation module according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a signal generation module according to an embodiment of the present invention;
FIG. 8 is a timing diagram of the signals of the signal generating module shown in FIG. 6;
FIG. 9 is a timing diagram of the signals of the signal generating module shown in FIG. 7;
fig. 10 is a schematic structural diagram of a signal generation module according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a signal generation module according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a light-emitting circuit according to another embodiment of the present invention;
fig. 13 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. 14 is a schematic cross-sectional view of a display panel as a light-emitting device according to an embodiment of the present invention;
FIG. 15 is a schematic structural diagram of a light emitting device according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of a light emitting device according to another embodiment of the present invention;
fig. 17 is a schematic structural view of a light emitting assembly according to another embodiment of the present invention;
fig. 18 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 19 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
An embodiment of the present invention provides a light emitting circuit, as shown in fig. 1, fig. 1 is a schematic structural diagram of the light emitting circuit provided in an embodiment of the present invention, and the light emitting circuit includes a signal processing module 10, a signal generating module 11, and a light emitting unit 12, where the signal processing module 10 is connected to the signal generating module 11, and the light emitting unit 12 is connected to the signal generating module 11.
The signal processing module 10 receives the first Data signal Data1, converts the first Data signal Data1 into a second Data signal Data2 with a voltage greater than zero, and transmits the second Data signal Data2 to the signal generating module 11; the signal generation module 11 generates a driving signal P according to the second Data signal Data2 to control the light emitting unit 12 to emit light by the driving signal P.
As shown in fig. 2, fig. 2 is a waveform diagram of the first Data signal and the second Data signal provided by an embodiment of the invention, in one period T1, the first Data signal Data1 is a positive value whose voltage value is greater than zero, in another period T2, the first Data signal Data1 is a negative value whose voltage value is less than zero, and the second Data signal Data2 is greater than zero in any period.
Since the first Data signal Data1 is a signal for controlling the inversion angle of the liquid crystal molecules, the first Data signal Data1 is a signal that is continuously inverted between a positive voltage value and a negative voltage value. However, such a signal is not suitable for directly driving the light emitting device to emit light because the light emitting device, such as a light emitting diode, is a device that is turned on in one direction, that is, when the first Data signal Data1 is a positive voltage value, a positive voltage is applied to both ends of the light emitting device, and the light emitting device emits light, and when the first Data signal Data1 is a negative voltage value, a reverse voltage is applied to both ends of the light emitting device, and the light emitting device does not emit light.
Although it is possible to control whether the light emitting device emits light or not by connecting the driving switch to the light emitting device, that is, connecting the first terminal of the driving switch to the first terminal of the light emitting device, connecting the second terminal of the driving switch to the first reference voltage terminal, and connecting the second terminal of the light emitting device to the second reference voltage terminal, by inputting a driving signal to the control terminal of the driving switch, the driving switch is controlled to be turned on and off. However, the first Data signal Data1 is still not suitable for controlling the on and off of the driving switch, because the positive and negative voltage values in the first Data signal Data1 cause the current value flowing through the driving switch to be difficult to control accurately, and further cause the current value flowing through the light emitting device to be difficult to control accurately, and cause the light emitting brightness of the light emitting device to be difficult to control accurately, resulting in poor display effect of the display screen.
Based on this, in the embodiment of the present invention, the signal processing module 10 converts the first Data signal Data1 into the second Data signal Data2 with a voltage greater than zero, and the signal generating module 11 generates the driving signal P according to the second Data signal Data2, so that the generated driving signal P is also a signal with a voltage greater than zero, and further, a current value flowing through the driving switch and/or the light emitting device in the light emitting unit 12 can be accurately controlled, and further, the light emitting brightness of the light emitting device can be accurately controlled, and further, the accurate control of the gray scale of the display screen can be realized, which is more favorable for further improving the display effect of the display screen.
In some embodiments of the present invention, as shown in fig. 3, fig. 3 is a schematic structural diagram of a signal processing module according to an embodiment of the present invention, where the signal processing module 10 includes a control module 101 and an operational amplifier module 102.
When the voltage of the first Data signal Data1 is greater than zero, the control module 101 controls the first input terminal of the operational amplification module 102 to be connected to the input terminal of the first Data signal Data1, so that the voltage of the second Data signal Data2 output by the operational amplification module 102 is equal to the voltage of the first Data signal Data 1;
when the voltage of the first Data signal Data1 is less than zero, the control module 101 controls the first input terminal of the operational amplification module 102 to be connected to the ground GND, so that the voltage of the second Data signal Data2 output by the operational amplification module 102 is equal to the negative value of the voltage of the first Data signal Data 1.
In some embodiments of the present invention, as shown in fig. 3, the control module 101 includes a first switch K1, a second switch K2, a first resistor R1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first diode D1, a second diode D2, and a second operational amplifier OP 2; the operational amplifier module 102 includes a first operational amplifier OP1, a second resistor R2, and a third resistor R3.
A first end of the first switch K1 receives the first Data signal Data1, a second end of the first switch K1 is connected to a first end of a first resistor R1, and a second end of the first resistor R1 is connected to a first input end of a first operational amplifier OP 1; a first end of the second resistor R2 is connected to a first end of the first switch K1, a second end of the second resistor R2 is connected to a second input end of the first operational amplifier OP1, and an output end of the first operational amplifier OP1 is connected to the signal generating module 11;
a first end of the third resistor R3 is connected to the second input terminal of the first operational amplifier OP1, and a second end of the third resistor R3 is connected to the output terminal of the first operational amplifier OP 1; a first end of the fourth resistor R4 is connected with a first end of the first switch K1, and a second end of the fourth resistor R4 is connected with a control end of the first switch K1; a first end of the fifth resistor R5 is connected to a second end of the fourth resistor R4, a second end of the fifth resistor R5 is connected to an anode of the first diode D1 and a cathode of the second diode D2, and a cathode of the first diode D1 and an anode of the second diode D2 are connected to the ground GND;
a first input end of the second operational amplifier OP2 is connected with a second end of the fifth resistor R5, a second input end of the second operational amplifier OP2 is connected with a first end of the sixth resistor R6, a second end of the sixth resistor R6 is connected with a ground end GND, and an output end of the second operational amplifier OP2 is connected with a control end of the second switch K2; a second terminal of the second switch K2 is connected to the ground GND, a first terminal of the second switch K2 is connected to a first terminal of the seventh resistor R7, and a second terminal of the seventh resistor R7 is connected to a first input terminal of the first operational amplifier OP 1.
It should be noted that the first switch K1 and the second switch K2 may be NMOS transistors or PMOS transistors, and in the embodiment of the present invention, only the first switch K1 and the second switch K2 are described as NMOS transistors.
When the first Data signal Data1 is a positive voltage, the first switch K1 is turned on, the second switch K2 is turned off, and the signal processing module 10 is equivalent to the structure shown in fig. 4, in which the first operational amplifier OP1 is an ideal operational amplifier with an amplification factor a0To infinity, the first resistor R1, the second resistor R2 and the third resistor R3 have equal resistance values, and V is controlled according to the basic circuit of the operational amplifierData2＝VData1That is, the voltage value of the second Data signal Data2 is equal to the voltage value of the first Data signal Data 1.
When the first Data signal Data1 is a negative voltage value, the first switch K1 is turned off, the second switch K2 is turned on, the signal processing module 10 is equivalent to the structure shown in fig. 5, VData2＝-(R2/R3)VData1＝-VData1That is, the voltage value of the second Data signal Data2 is equal to the negative value of the voltage value of the first Data signal Data 1. That is, VData2＝|VData1I.e., the voltage value of the second Data signal Data2 is equal to the absolute value of the voltage value of the first Data signal Data 1.
It should be noted that, in the embodiment of the present invention, only the structure shown in fig. 3 is taken as an example for description, and the present invention is not limited thereto, and in other embodiments, the signal processing module 10 may also have other structures as long as the functions of the signal processing module 10 in the embodiment of the present invention can be realized.
On this basis, in some embodiments of the present invention, as shown in fig. 6 or fig. 7, fig. 6 is a schematic structural diagram of a signal generating module according to an embodiment of the present invention, fig. 7 is a schematic structural diagram of a signal generating module according to an embodiment of the present invention, and the signal generating module 11 includes a third operational amplifier OP 3; the light emitting unit 12 includes a driving switch 120 and a light emitting device 121.
The third operational amplifier OP3 generates the driving signal P according to the second Data signal Data2 and the reference signal REF, so as to control the driving switch 120 to be turned on by the driving signal P, and control the light-emitting device 121 to emit light by controlling the driving switch 120 to be turned on.
In some embodiments of the present invention, as shown in fig. 6, a first terminal of the driving switch 120 is connected to a first terminal of the light emitting device 121, a second terminal of the driving switch 120 is connected to the first reference voltage terminal PVEE, and a second terminal of the light emitting device 121 is connected to the second reference voltage terminal PVDD; a first input terminal of the third operational amplifier OP3 receives the second Data signal Data2, a second input terminal of the third operational amplifier OP3 receives the reference signal REF, and an output terminal of the third operational amplifier OP3 is connected to the control terminal of the driving switch 120. In the structure shown in fig. 6, the driving switch 120 is an NMOS transistor or a PMOS transistor.
As shown in fig. 8, fig. 8 is a signal timing diagram of the signal generating module shown in fig. 6, wherein the reference signal REF is a triangular wave signal, when the second Data signal Data2 is smaller than the reference signal REF, the third operational amplifier OP3 outputs a low level, i.e., the driving signal P is a low level, and when the second Data signal Data2 is larger than the reference signal REF, the third operational amplifier OP3 outputs a high level, i.e., the driving signal P is a high level. 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. Furthermore, in other embodiments, the third operational amplifier OP3 may also be a comparator or the like.
As shown in fig. 8, the generated driving signal P is a periodically varying voltage signal, the pulse width of the generated driving signal P can be adjusted by adjusting the pulse width of the reference signal REF, and further the on-time of the driving switch 120 can be adjusted by adjusting the pulse width of the driving signal P, the light emitting time of the light emitting device 121 can be adjusted by adjusting the on-time of the driving switch 120, 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, and the gray scale of the display screen can be adjusted by adjusting the total brightness of the light emitting device 13 in one light emitting period.
Therefore, the total brightness of the light emitting device 121 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, and the display effect of the display image can be improved. In addition, the gray scale of the display picture is adjusted by adjusting the pulse width of the reference signal REF, and the data signal is not required to be adjusted, so that the adjustment process is simpler and more convenient, and the adjustment mode is more favorable for practical application. The generated driving signal P may be a PWM (Pulse width modulation) signal. The driving signal P is a high-frequency PWM signal to eliminate visual fatigue, vertigo, and the like due to low-frequency dimming. Of course, the invention is not limited thereto, and in other embodiments, as shown in fig. 7, the signal generating module 11 further includes an eighth resistor R8. A first input end of the third operational amplifier OP3 receives the second Data signal Data2, a second input end of the third operational amplifier OP3 is connected to the second end of the driving switch 120 through an eighth resistor R8, and an output end of the third operational amplifier OP3 is connected to the control end of the driving switch 120; a first terminal of the driving switch 120 is connected to a first terminal of the light emitting device 121, a second terminal of the driving switch 120 is connected to a first reference voltage terminal PVEE, and a second terminal of the light emitting device 121 is connected to a second reference voltage terminal PVDD. In the structure shown in fig. 7, the driving switch 120 is an NMOS transistor.
As shown in fig. 9, fig. 9 is a signal timing diagram of the signal generating module shown in fig. 7, wherein the third operational amplifier OP3 outputs the driving signal P after performing an operation such as addition or subtraction on the second Data signal Data2 and a reference signal REF, and the reference signal REF is equal to a voltage at a connection end between the eighth resistor R8 and the third operational amplifier OP 3.
As shown in fig. 9, the reference signal REF is a fixed value, the voltage value of the driving signal P is determined by the voltage value of the second Data signal Data2, that is, the voltage value of the driving signal P is determined by the voltage value of the first Data signal Data1, wherein the voltage value of the driving signal P is greater than the turn-on voltage of the driving switch 120, and the current flowing through the driving switch 120 and the light emitting device 121 is determined by the voltage value of the driving signal P, that is, the current flowing through the light emitting device 121 can be accurately determined according to the first Data signal Data1, so that the light emitting brightness of the light emitting device 121 can be accurately determined, and the gray scale of the display screen can be accurately determined.
In addition, since the voltage value of the driving signal P is not changed when the voltage value of the first Data signal Data1 is not changed, the driving switch 120 does not continuously alternate between the on state and the off state, and power consumption of the driving switch 120 can be reduced.
Of course, the present invention is not limited thereto, and in other embodiments, as shown in fig. 10, fig. 10 is a schematic structural diagram of a signal generating module according to an embodiment of the present invention, where the signal generating module 11 includes a fourth operational amplifier OP4 and a voltage follower B1; the light emitting unit 12 includes a light emitting device 121.
The fourth operational amplifier OP4 generates a driving signal P according to the second Data signal Data2 and the first reference voltage V1, so as to drive the light emitting device 121 to emit light by the driving signal P; the voltage follower B1 makes the voltage of the driving signal P output by the fourth operational amplifier OP4 the same as the voltage of the second Data signal Data 2.
On this basis, as shown in fig. 10, the signal generating module 11 further includes a ninth resistor R9 to a twelfth resistor R12.
A first input end of the fourth operational amplifier OP4 receives the second Data signal Data2, a second input end of the fourth operational amplifier OP4 is connected to a first end of a ninth resistor R9, a second end of the ninth resistor R9 is connected to an output end of the fourth operational amplifier OP4, a first end of the ninth resistor R9 is connected to a first end of a tenth resistor R10, and a second end of the tenth resistor R10 is connected to a ground GND;
a first terminal of the eleventh resistor R11 is connected to the output terminal of the fourth operational amplifier OP4, a second terminal of the eleventh resistor R11 is connected to the first terminal of the light emitting device 121, and the second terminal of the light emitting device 121 is connected to the ground terminal GND; a first terminal of the twelfth resistor R12 is connected to a first input terminal of the fourth operational amplifier OP4, a second terminal of the twelfth resistor R12 is connected to an output terminal of the voltage follower B1, a first input terminal of the voltage follower B1 is connected to an output terminal of the voltage follower B1, and a second input terminal of the voltage follower B1 is connected to a first terminal of the light emitting device 121.
Referring to fig. 9, the fourth operational amplifier OP4 outputs the driving signal P after performing an operation such as addition or subtraction on the second Data signal Data2 and the first reference voltage V1, the voltage value of the driving signal P is determined by the voltage value of the second Data signal Data2, that is, the voltage value of the driving signal P is determined by the voltage value of the first Data signal Data1, that is, the voltage of the anode of the light emitting device 121 is determined by the voltage value of the driving signal P, so that the current flowing through the light emitting device 121 is determined by the voltage value of the driving signal P, that is, the current flowing through the light emitting device 121 can be accurately controlled according to the first Data signal Data1, and further the light emitting brightness of the light emitting device 121 can be accurately controlled, and further the gray scale of the display screen can be accurately controlled.
In other embodiments, as shown in fig. 11, fig. 11 is a schematic structural diagram of a signal generating module according to an embodiment of the present invention, where the signal generating module 11 includes a fifth operational amplifier OP 5; the light emitting unit 12 includes a first switch K1, a driving switch 120, and a light emitting device 121.
The fifth operational amplifier OP5 generates the driving signal P according to the second Data signal Data2 and the second reference voltage V2, so as to control the first switch K1 and the driving switch 120 to be in an on state through the driving signal P1, and drive the light emitting device 121 to emit light.
On this basis, as shown in fig. 11, the signal generating module 11 further includes a thirteenth resistor R13 and a fourteenth resistor R14.
A first input end of the fifth operational amplifier OP5 receives the second Data signal Data2, an output end of the fifth operational amplifier OP5 is connected to the control end of the first switch K1 through a thirteenth resistor R13, and a second input end of the fifth operational amplifier OP5 is connected to the second end of the driving switch 120 through a fourteenth resistor R14; a first terminal of the first switch K1 is connected to a first reference voltage terminal PVEE, a second terminal of the first switch K1 is connected to a control terminal of the driving switch 120, a first terminal of the driving switch 120 is connected to the first reference voltage terminal PVEE, a second terminal of the driving switch 120 is connected to a first terminal of the light emitting device 121, and a second terminal of the light emitting device 121 is connected to a second reference voltage terminal PVDD.
In the embodiment of the present invention, the first switch K1 is an NMOS transistor, and the driving switch 120 is an NMOS transistor or a PMOS transistor. Taking the first switch K1 and the driving switch 120 as NMOS transistors as an example, the fifth operational amplifier OP5 outputs the driving signal P after performing addition or subtraction or other operation on the second Data signal Data2 and the second reference voltage V2, and a timing diagram of the driving signal P refers to fig. 9, so that the first switch K1 is in a conducting state, and transmits the voltage of the second reference voltage end PVDD to the control end of the driving switch 120, because the voltage of the second reference voltage end PVDD is greater than the voltage of the first reference voltage end PVEE, that is, the voltage of the second reference voltage end PVDD is a high voltage, the driving switch 120 is turned on, and the light emitting device 121 emits light.
Note that the current in the light emitting device 121
Figure BDA0003013521170000111
Wherein β 1 and β 2 are current amplification factors of the first switch K1 and the driving switch 120, and β 1 and β 2 are large enough, so
Figure BDA0003013521170000112
In this embodiment, U is the voltage of the driving signal P, and LEDR is the resistance of the light emitting device 121, so that different voltage values U can obtain different current values, that is, the current of the light emitting device 121 can be accurately controlled by the driving signal P, and further, the brightness of the light emitting device 121 and the gray scale of the display frame can be accurately controlled.
On the basis of any of the above embodiments, in some embodiments of the present invention, as shown in fig. 12, fig. 12 is a schematic structural diagram of a light emitting circuit according to another embodiment of the present invention, and the light emitting unit 12 further includes a scan control switch M; under the control of the SCAN signal SCAN, the SCAN control switch M is in an on state or an off state; if the scan control switch M is in the on state, the light emitting unit 12 emits light; if the scan control switch M is in an off state, the light emitting unit 12 does not emit light.
The embodiment of the invention also provides a light-emitting component, which comprises a light-emitting circuit, wherein the light-emitting circuit is provided by any one of the above embodiments. Wherein the light emitting circuit includes at least one light emitting cell. When the light emitting circuit includes a plurality of light emitting cells or the light emitting assembly includes a plurality of light emitting circuits, the light emitting assembly includes a plurality of light emitting cells, and the plurality of light emitting cells are arranged in an array.
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. 13, fig. 13 is a schematic cross-sectional structure diagram of the light emitting device, i.e., the backlight module, according to an embodiment of the present invention, wherein 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 121 in the backlight module is used for providing a backlight source for the pixel units in the liquid crystal display panel.
In this case, the first Data signal Data1 received by the light emitting circuit 1 in the backlight module may be a Data signal of a display screen inputted from the outside, or a Data signal of a display screen outputted by a driver chip in the display device. That is, the light emitting circuit 1 may obtain the second Data signal Data2 having a voltage greater than zero according to the first Data signal Data1 of the display screen externally input or output by the driving chip, and obtain the driving signal P according to the second Data signal Data2 to drive the light emitting unit 12 to emit light by the driving signal P.
Certainly, in other embodiments, as shown in fig. 14, fig. 14 is a schematic cross-sectional structure diagram of a display panel, which is a light emitting component according to an embodiment of the present invention, the light emitting component is a display panel capable of emitting light actively, one light emitting unit 12 on the display panel constitutes one pixel unit, a driving chip on the display panel outputs a first Data signal Data1, the light emitting circuit 1 obtains a second Data signal Data2 with a voltage greater than zero according to the first Data signal Data1, and obtains a driving signal P according to the second Data signal Data2, so as to drive the light emitting unit 12 to emit light through the driving signal P.
In the backlight module shown in fig. 13 and the display panel shown in fig. 14, the light emitting devices in the light emitting unit 12 may be light emitting devices directly fabricated on the substrate by a process such as plating, or may be light emitting devices fabricated and then soldered on the substrate.
In some embodiments of the present invention, as shown in fig. 15, fig. 15 is a schematic structural diagram of a light emitting assembly according to an embodiment of the present invention, each light emitting circuit 1 includes a plurality of light emitting units 12, the plurality of light emitting units 12 are located in a same column, and the light emitting units 12 in different driving circuits 1 are located in different columns.
The light emitting unit 12 includes a Scan control switch, the light emitting assembly includes a plurality of Scan lines Scan, each Scan line Scan is connected to a control end of the Scan control switch in a row of light emitting units 12; the Scan lines Scan sequentially supply Scan signals, and when any one of the Scan lines Scan supplies a Scan signal to a row of light emitting units 12 connected thereto, the row of light emitting units 12 emit light simultaneously or sequentially.
Of course, the present invention is not limited thereto, and in other embodiments, as shown in fig. 16, fig. 16 is a schematic structural diagram of a light emitting assembly according to another embodiment of the present invention, and each light emitting circuit 1 includes one light emitting unit 12; the light emitting units 12 in the plurality of light emitting circuits 1 sequentially emit light. The light emitting circuit 1 sequentially receives the first Data signals Data1, converts the first Data signals Data1 into second Data signals Data2 having voltages greater than zero, and generates the driving signal P according to the second Data signals Data2 to control the light emitting units 12 to sequentially emit light by the driving signal P.
It should be noted that the light emitting circuit 1 shown in fig. 16 may also include a Scan control switch and a plurality of Scan lines Scan, so that when the Scan signals are sequentially supplied through the plurality of Scan lines Scan, and any one Scan line Scan supplies the Scan signal to the light emitting units 12 in one row connected thereto, the light emitting units 12 in one row emit light simultaneously or sequentially.
Of course, in another embodiment, as shown in fig. 17, fig. 17 is a schematic structural diagram of a light emitting device according to another embodiment of the present invention, and a reference signal REF needs to be provided to all light emitting circuits 1, so that the light emitting circuits 1 generate the driving signal P according to the second Data signal Data2 and the reference signal REF.
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 invention, as shown in fig. 17, 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 or the ground terminal GND in one row of the light emitting cells 12, and each of the second voltage signal lines is connected to the second reference voltage terminal PVDD in one row of the light emitting cells 12, so that parasitic capacitances of the voltage signal lines are reduced 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 an influence of the parasitic capacitances on the light emitting performance of the light emitting device. 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.
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 the 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. 18, fig. 18 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 component can also be a mini LED or a micro LED.
When the light emitting device is a backlight module, as shown in fig. 19, fig. 19 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.
In the present specification, the embodiments 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 (17)

1. The light-emitting circuit is characterized by comprising a signal processing module, a signal generating module and a light-emitting unit, wherein the signal processing module is connected with the signal generating module, and the light-emitting unit is connected with the signal generating module;
the signal processing module receives a first data signal, converts the first data signal into a second data signal with voltage larger than zero, and transmits the second data signal to the signal generating module;
the signal generation module generates a driving signal according to the second data signal so as to control the light-emitting unit to emit light through the driving signal;
the signal processing module comprises a control module and an operational amplification module;
if the voltage of the first data signal is greater than zero, the control module controls a first input end of the operational amplification module to be connected with the input end of the first data signal, so that the voltage of a second data signal output by the operational amplification module is equal to the voltage of the first data signal;
if the voltage of the first data signal is less than zero, the control module controls the first input end of the operational amplification module to be connected with a grounding end, so that the voltage of the second data signal output by the operational amplification module is equal to the negative value of the voltage of the first data signal.
2. The light emitting circuit of claim 1, wherein the control module comprises a first switch, a second switch, a first resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first diode, a second diode, and a second operational amplifier; the operational amplification module comprises a first operational amplifier, a second resistor and a third resistor;
a first end of the first switch receives the first data signal, a second end of the first switch is connected with a first end of the first resistor, and a second end of the first resistor is connected with a first input end of the first operational amplifier;
the first end of the second resistor is connected with the first end of the first switch, the second end of the second resistor is connected with the second input end of the first operational amplifier, and the output end of the first operational amplifier is connected with the signal generation module;
a first end of a third resistor is connected with the second input end of the first operational amplifier, and a second end of the third resistor is connected with the output end of the first operational amplifier;
a first end of a fourth resistor is connected with a first end of the first switch, and a second end of the fourth resistor is connected with a control end of the first switch; a first end of a fifth resistor is connected with a second end of the fourth resistor, a second end of the fifth resistor is connected with an anode of a first diode and a cathode of a second diode, and the cathode of the first diode and the anode of the second diode are connected with a grounding end;
a first input end of the second operational amplifier is connected with a second end of the fifth resistor, a second input end of the second operational amplifier is connected with a first end of a sixth resistor, a second end of the sixth resistor is connected with a ground end, and an output end of the second operational amplifier is connected with a control end of the second switch;
the second end of the second switch is connected with a ground terminal, the first end of the second switch is connected with the first end of the seventh resistor, and the second end of the seventh resistor is connected with the first input end of the first operational amplifier.
3. The light emitting circuit of claim 1, wherein the signal generation module comprises a third operational amplifier; the light emitting unit includes a driving switch and a light emitting device;
the third operational amplifier generates the driving signal according to the second data signal and a reference signal, so that the driving switch is controlled to be turned on by the driving signal, and the light emitting device is controlled to emit light by controlling the driving switch to be turned on.
4. The light circuit of claim 3, wherein the reference signal is a triangular wave 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 a first reference voltage end, and the second end of the light-emitting device is connected with a second reference voltage end;
the first input end of the third operational amplifier receives the second data signal, the second input end of the third operational amplifier receives a reference signal, and the output end of the third operational amplifier is connected with the control end of the driving switch.
5. The lighting circuit according to claim 3, wherein the signal generating module further comprises an eighth resistor;
a first input end of the third operational amplifier receives the second data signal, a second input end of the third operational amplifier is connected with a second end of the driving switch through the eighth resistor, and an output end of the third operational amplifier is connected with a control end of the driving switch;
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.
6. The lighting circuit of claim 1, wherein the signal generation module comprises a fourth operational amplifier and a voltage follower; the light emitting unit includes a light emitting device;
the fourth operational amplifier generates the driving signal according to the second data signal and a first reference voltage so as to drive the light emitting device to emit light through the driving signal;
the voltage follower makes the voltage of the driving signal output by the fourth operational amplifier the same as the voltage of the second data signal.
7. The lighting circuit according to claim 6, wherein the signal generating module further comprises ninth to twelfth resistors;
a first input end of the fourth operational amplifier receives the second data signal, a second input end of the fourth operational amplifier is connected with a first end of the ninth resistor, a second end of the ninth resistor is connected with an output end of the fourth operational amplifier, a first end of the ninth resistor is connected with a first end of the tenth resistor, and a second end of the tenth resistor is connected with a ground end;
a first end of an eleventh resistor is connected with an output end of the fourth operational amplifier, a second end of the eleventh resistor is connected with a first end of the light-emitting device, and a second end of the light-emitting device is connected with a ground end;
the first end of the twelfth resistor is connected with the first input end of the fourth operational amplifier, the second end of the twelfth resistor is connected with the output end of the voltage follower, the first input end of the voltage follower is connected with the output end of the voltage follower, and the second input end of the voltage follower is connected with the first end of the light-emitting device.
8. The light emitting circuit of claim 1, wherein the signal generation module comprises a fifth operational amplifier; the light emitting unit includes a first switch, a driving switch, and a light emitting device;
and the fifth operational amplifier generates a driving signal according to the second data signal and a second reference voltage, so as to control the first switch to be in a conducting state and control the driving switch to be in a conducting state through the driving signal, and drive the light-emitting device to emit light.
9. The lighting circuit according to claim 8, wherein the signal generating module further comprises a thirteenth resistor and a fourteenth resistor;
a first input end of the fifth operational amplifier receives the second data signal, an output end of the fifth operational amplifier is connected with the control end of the first switch through the thirteenth resistor, and a second input end of the fifth operational amplifier is connected with a second end of the driving switch through the fourteenth resistor; the first end of the first switch is connected with a first reference voltage end, the second end of the first switch is connected with the control end of the driving switch, the first end of the driving switch is connected with the first reference voltage end, the second end of the driving switch is connected with the first end of the light-emitting device, and the second end of the light-emitting device is connected with a second reference voltage end.
10. The light-emitting circuit according to claim 1, wherein the light-emitting unit further comprises a scan control switch; under the control of the scanning signal, the scanning control switch is in a conducting state or a switching-off state; and if the scanning control switch is in a conducting state, the light-emitting unit emits light.
11. A light emitting device comprising a light emitting circuit according to any one of claims 1 to 10;
the light emitting circuit includes at least one light emitting cell; the plurality of light emitting units are arranged in an array.
12. The light emitting assembly of claim 11, wherein each light emitting circuit comprises a plurality of light emitting cells, the plurality of light emitting cells being in a same column, the light emitting cells in different driving circuits being in different columns;
the light-emitting unit comprises a scanning control switch, the light-emitting assembly comprises a plurality of scanning lines, and each scanning line is connected with the control end of the scanning control switch in one row of light-emitting units;
the scanning lines provide scanning signals in sequence, and when any scanning line provides scanning signals to a row of light-emitting units connected with the scanning line, the row of light-emitting units emit light simultaneously or sequentially.
13. The lighting assembly of claim 11, wherein each lighting circuit comprises a lighting unit;
the light emitting units in the plurality of light emitting circuits sequentially emit light.
14. The lighting assembly of claim 11, 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 light-emitting circuit.
15. The light emitting device of claim 11, wherein the light emitting device comprises a plurality of first voltage signal lines and a plurality of second voltage signal lines, each of the first voltage signal lines is connected to a first reference voltage terminal or a ground terminal of the light emitting circuit in which the row of light emitting cells are located, and each of the second voltage signal lines is connected to a second reference voltage terminal of the light emitting circuit in which the row of light emitting cells are located.
16. A display device comprising the light-emitting element according to any one of claims 11 to 15.
17. The display device according to claim 16, 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.
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