CN214099115U - Drive circuit, light-emitting substrate and display device - Google Patents

Abstract

The application discloses drive circuit, luminescent substrate and display device for reduce the total number of luminescent device, improve drive circuit's life when realizing local dimming. The application provides a drive circuit includes: a plurality of sub-driving circuits, and a light emitting device coupled to each of the sub-driving circuits; each sub-driving circuit is coupled to the same scanning signal end and the power signal end; each sub-driving circuit is coupled with different data signal terminals; each sub-driving circuit includes: the driving control module and the driving current generation module; the drive control module is used for generating a drive control signal according to the data signal; and the driving current generation module is used for generating driving current for controlling the light emitting device to emit light according to the driving control signal and a power supply signal end.

Description

Drive circuit, light-emitting substrate and display device

Technical Field

The present application relates to the field of display technologies, and in particular, to a driving circuit, a light emitting substrate and a display device.

Background

With the pursuit of high color gamut, high contrast and ultra-thin appearance, the Organic Light-Emitting Diode (OLED) panel technology is becoming the focus of attention in the display field by virtue of its characteristics of lightness, thinness, flexibility, etc. However, OLEDs are ubiquitous in light decay and burn-in problems, which greatly affect the lifetime of OLED display devices. In recent years, Mini-LEDs (Mini-LEDs) have been widely used in backlight displays of Liquid Crystal Displays (LCDs) because of their advantages such as high color saturation, local dimming capability, high brightness, and energy saving, and are favored by many panel companies. However, in order to make up for the deficiency of the LCD in contrast, the conventional Mini-LED backlight technology mainly implements dynamic backlight by controlling the Mini-LED to emit light in a divisional manner through a driving Circuit, and implements local dimming by directly supplying power to a backlight data driving Chip (IC) and scanning line by line.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a driving circuit, a light-emitting substrate and a display device, which are used for reducing the total number of light-emitting devices and prolonging the service life of the driving circuit while realizing local dimming.

The embodiment of the application provides a drive circuit, drive circuit includes: a plurality of sub-driving circuits, and a light emitting device coupled to each of the sub-driving circuits;

each sub-driving circuit is coupled to the same scanning signal end and the power signal end; each sub-driving circuit is coupled with different data signal terminals;

each of the sub-driving circuits includes: the driving control module and the driving current generation module;

the drive control module is used for generating a drive control signal according to the data signal;

and the driving current generation module is used for generating driving current for controlling the light emitting device to emit light according to the driving control signal and a power supply signal end.

In some embodiments, a plurality of the sub-driving circuits includes: a first sub-driving circuit, and at least one second sub-driving circuit;

in each of the first sub-driving circuits and each of the second sub-driving circuits, the driving control module includes a driving switch, and the driving current generating module includes: a power supply selection switch;

in each of the second sub-driving circuits, the driving current generation module further includes: a driving current regulation module;

the control end of the driving switch is coupled with the scanning signal end, the first end of the driving switch is coupled with the data signal end, and the second end of the driving switch is coupled with the control end of the power supply selection switch;

the first end of the power supply selection switch is coupled with the power supply signal end;

in the first sub-driving circuit, a second terminal of the power supply selection switch is coupled to the light emitting device;

in the second sub-driving circuit, a second terminal of the power supply selection switch is coupled to the driving current regulation and control module.

In some embodiments, the drive switch comprises a first transistor; the power supply selection switch includes a second transistor;

a gate of the first transistor is coupled to the scan signal terminal, a source of the first transistor is coupled to the data signal terminal, and a drain of the first transistor is coupled to a gate of the second transistor;

the source electrode of the second transistor is coupled with the power supply signal end;

in the first sub-driving circuit, a drain of the second transistor is coupled to the light emitting device;

in the second sub-driving circuit, the drain of the second transistor is coupled to the driving current regulation and control module.

In some embodiments, the driving current regulation module comprises: driving a current regulation resistor;

in different second sub-driving circuits, the resistance values of the driving current regulation resistors are different.

In some embodiments, in the first sub-driving circuit, the driving current generation module further includes: a current limiting resistor;

the current limiting resistor is coupled with the second end of the power supply selection switch and the light-emitting device;

the resistance value of the current limiting resistor is different from the resistance value of each driving current regulating resistor.

In some embodiments, the sub-driving circuit further comprises: a first capacitor;

the first stage of the first capacitor is coupled to the second terminal of the driving switch and the control terminal of the power supply selection switch, and the second stage of the first capacitor is coupled to the second terminal of the power supply selection switch.

In some embodiments, the driving circuit includes one of the first sub-driving circuits and three of the second sub-driving circuits.

In some embodiments, the light emitting device comprises a micro-sized light emitting diode.

The embodiment of this application provides a luminescent substrate, luminescent substrate includes: the light-emitting device comprises a substrate and a plurality of light-emitting units arranged in an array manner on the substrate;

each light-emitting unit comprises the driving circuit provided by the embodiment of the application.

In some embodiments, the light emitting substrate further comprises: a data driving chip;

the data driving chip is configured to: and respectively providing a data signal to each sub-drive circuit in the drive circuit according to the current required brightness of the light-emitting device, so that a drive current generation module in the sub-drive circuit matched with the brightness generates a drive current according to a power signal of a power signal end, and the power signal end and the light-emitting device are disconnected through the rest sub-drive circuits in each drive circuit.

An embodiment of the present application provides a display device, the display device includes: the embodiment of the application provides a light-emitting substrate, and be located the display panel of light-emitting substrate light-emitting side.

According to the drive circuit, the light-emitting substrate and the display device, the drive circuit comprises a plurality of sub-drive circuits, and different sub-drive circuits can generate drive currents with different sizes according to the drive control signals. Thus, when the light emitting device is driven to emit light, different sub-driving circuits can respectively supply different light emitting currents to the light emitting device. Namely, under the drive of different sub-drive circuits, the light-emitting brightness of the light-emitting device is different. Therefore, the light emitting device can generate a plurality of brightness levels under the drive of different sub-drive circuits. When the driving circuit provided by the embodiment of the application is applied to the light-emitting substrate, the total number of light-emitting devices in the light-emitting substrate can be saved, and the cost can be saved. And, since one light emitting device is controlled by a plurality of sub driving circuits, only one sub driving circuit among the plurality of sub driving circuits supplies a driving current to the light emitting device, it is possible to improve the life span of each sub driving circuit.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a driving circuit according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another driving circuit provided in the embodiment of the present application;

fig. 3 is a schematic structural diagram of another driving circuit provided in the embodiment of the present application;

fig. 4 is a schematic view of a light-emitting substrate according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present disclosure. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

An embodiment of the present application provides a driving circuit, as shown in fig. 1, the driving circuit includes: a plurality of sub-driving circuits 1, and a light emitting device 2 coupled to each of the sub-driving circuits 1;

each sub-driving circuit 1 is coupled to the same scanning signal terminal GATE and the power signal terminal VDD; each of the sub-driving circuits 1 is coupled to a different DATA signal terminal DATA;

each of the sub-driving circuits 1 includes: a drive control module 101, and a drive current generation module 102;

the driving control module 101 is configured to generate a driving control signal according to a data signal;

the driving current generating module 102 is configured to generate a driving current for controlling the light emitting device 2 to emit light according to the driving control signal in cooperation with a power signal terminal VDD.

In some embodiments, the drive control module 101 is configured to: in response to the scan signal of the scan signal terminal GATE, generating a driving control signal according to the DATA signal of the DATA signal terminal DATA, and providing the driving control signal to the driving current generating module 102;

the drive current generation module 102 is configured to: responding to the driving control signal, and generating a driving current according to a power supply signal of the power supply signal terminal VDD; or responding to the driving control signal to make the power signal end and the light-emitting device be disconnected through the driving current generation module; in different sub-driving circuits 1, the driving current generated by the driving current generating module 102 is different in magnitude.

It should be noted that, in the driving circuit provided in the embodiment of the present application, when it is required to drive the light emitting device to emit light, only one of the plurality of sub-driving circuits provides a driving current to the light emitting device, that is, one of the plurality of sub-driving current generating modules is configured to: in response to the driving control signal, generating a driving current according to a power signal of the power signal terminal VDD, the remaining sub driving current generating module being configured to: responding to a driving control signal to make the power supply signal end and the light-emitting device be disconnected through the driving current generation module. Because the different sub-driving circuits generate different driving currents according to the power supply signal, the luminance of the light emitting device driven by different sub-driving signals is different. When the driving circuit includes n sub-driving circuits, the n sub-driving circuits can respectively provide n driving currents with different current magnitudes to the light emitting device, and in addition, when the light emitting device does not emit light, the driving circuit can control the light emitting device to generate n +1 brightness levels, wherein n is greater than or equal to 2. In specific implementation, the corresponding sub-driving circuit can be selected to provide the driving current according to the required brightness of the light emitting device.

The driving circuit provided by the embodiment of the application comprises a plurality of sub-driving circuits, and different sub-driving circuits can generate driving currents with different sizes according to driving control signals. Thus, when the light emitting device is driven to emit light, different sub-driving circuits can respectively supply different light emitting currents to the light emitting device. Namely, under the drive of different sub-drive circuits, the light-emitting brightness of the light-emitting device is different. Therefore, the light emitting device can generate a plurality of brightness levels under the drive of different sub-drive circuits. When the driving circuit provided by the embodiment of the application is applied to the light-emitting substrate, the total number of light-emitting devices in the light-emitting substrate can be saved, and the cost can be saved. And, since one light emitting device is controlled by a plurality of sub driving circuits, only one sub driving circuit among the plurality of sub driving circuits supplies a driving current to the light emitting device, it is possible to improve the life span of each sub driving circuit.

It should be noted that, in fig. 1, the driving circuit includes 4 sub-driving circuits as an example, the 4 sub-driving circuits can respectively provide 4 driving currents with different current magnitudes to the light emitting device, and in addition, when the light emitting device does not emit light, the driving circuit can control the light emitting device to generate 5 brightness levels. In a specific implementation, the number of the sub-driving circuits may be set according to the number of brightness levels required to be obtained to implement local dimming, and the present application is not limited thereto.

In some embodiments, as shown in fig. 1, a plurality of the sub-driving circuits 1 includes: a first sub-driving circuit 3, and at least one second sub-driving circuit 4;

in each of the first sub-driving circuit 3 and the second sub-driving circuit 4, the driving control module 101 includes a driving switch 1011, and the driving current generating module 102 includes: a power supply selection switch 1021;

in each of the second sub-driving circuits 4, the driving current generating module 102 further includes: a driving current regulation module 1022;

a control terminal of the driving switch 1011 is coupled to the scan signal terminal GATE, a first terminal of the driving switch 1011 is coupled to the DATA signal terminal DATA, and a second terminal of the driving switch 1011 is coupled to a control terminal of the power supply selection switch 1021;

a first terminal of the power supply selection switch 1021 is coupled to the power signal terminal VDD;

in the first sub-driving circuit 3, a second terminal of the power supply selection switch 1021 is coupled to the light emitting device 2;

in the second sub-driving circuit, a second terminal of the power supply selection switch 1021 is coupled to the driving current regulation module 1022.

In a specific implementation, when the driving switch is turned on in response to the scan signal, the driving control signal generated according to the data signal is provided to the control terminal of the power supply selection switch. For each sub-driving circuit, when the power supply selection switch is turned on in response to the driving control signal, the power signal terminal is conducted with the light-emitting device, that is, the light-emitting device is driven to emit light by the sub-driving circuit. For each sub-drive circuit, when the power supply selection switch is turned off in response to the drive control signal, the power supply signal terminal and the light emitting device are disconnected, and the sub-drive circuit does not supply the drive current to the light emitting device.

In a specific implementation, the data signal terminal provides the first level signal or the second level signal to the sub-driving circuit, and when the light emitting device does not emit light, the data signal terminal provides zero data signal to the driving circuit. The driving switch controls the power supply selection switch to be turned on according to a driving control signal generated by the first level signal, and controls the power supply selection switch to be turned off according to a driving control signal generated by the second level signal. Specifically, the data signal terminal provides a first level signal to one of the plurality of sub-driving circuits and provides a second level signal to the remaining sub-driving circuits, so that only one sub-driving circuit provides a driving current to the light emitting device in each driving circuit. It should be noted that one of the first level signal and the second level signal is a high level signal, and the other is a low level signal, and in the implementation, it is determined whether the first level signal is a high level signal or a low level signal according to the specific types of the driving switch and the power supply selection switch.

In specific implementation, for the second sub-driver circuit, the driving current regulation and control module is configured to: when the power supply selection switch is turned on in response to the drive control signal, a drive current is generated in accordance with the power supply signal. The driving current generated by the different driving current regulation and control modules is different in magnitude, and the driving current generated by the different driving current regulation and control modules is different in magnitude from the driving current provided by the first sub-driving circuit to the light-emitting device. Therefore, the driving current generated by the driving current generation module in different sub-driving circuits can be different.

In some embodiments, as shown in fig. 2, the driving switch 1011 includes a first transistor T1; the power supply selection switch 1021 includes a second transistor T2;

a GATE of the first transistor T1 is coupled to the scan signal terminal GATE, a source of the first transistor T1 is coupled to the DATA signal terminal DATA, and a drain of the first transistor T1 is coupled to a GATE of the second transistor T2;

a source of the second transistor T2 is coupled to the power signal terminal VDD;

in the first sub-driving circuit 3, the drain of the second transistor T2 is coupled to the light emitting device 2;

in the second sub-driving circuit 4, the drain of the second transistor T2 is coupled to the driving current regulation and control module 1022.

It should be noted that, in the related art, the light emitting device is controlled to emit light by only one sub-driving circuit. Since the transistor is easily aged during use, especially for the second transistor as a power supply selection switch, when the second transistor is aged, the driving current supplied to the light emitting device is greatly reduced, so that the luminance of the light emitting device is reduced. In some embodiments, in the driving circuit provided in the embodiments of the present application, the second transistor may be a transistor with a larger width-to-length ratio, and even if the second transistor is aged, because the transistor has a larger width-to-length ratio, the current provided by the second transistor may still enable the light emitting device to operate normally, so that the service life of the driving circuit may be prolonged. In addition, according to the driving circuit provided by the embodiment of the application, the plurality of sub-driving circuits respectively provide driving currents for the light-emitting devices, so that the working time of the transistor in each sub-driving circuit is greatly reduced, and the service life of the driving circuit can be prolonged.

It should be noted that, in the related art driving circuit, a transistor with a width-to-length ratio range of 100 to 1000 is usually adopted, and in the driving circuit provided in the embodiment of the present application, a transistor with a width-to-length ratio that is a multiple of the above range may be adopted as the second transistor, for example, the width-to-length ratio may be 2000 to 10000. In specific implementation, the width-to-length ratios of the second transistors in the sub-driving circuits are different, and under the condition that the width-to-length ratio of the second transistors is large, the width-to-length ratio of T2 in each sub-driving circuit is related to the magnitude of the driving current that the sub-driving circuit needs to supply to the light emitting device, and the larger the driving current that the sub-driving circuit needs to supply to the light emitting device is, the larger the width-to-length ratio of T2 in the sub-driving circuit is.

In some embodiments, the first Transistor and the second Transistor may be one of a Thin Film Transistor (TFT) and a Metal Oxide Semiconductor (MOS) Field Effect Transistor (FET), where the MOS Field Effect Transistor is referred to as a MOS Transistor.

In some embodiments, the first transistor and the second transistor may be N-type transistors or P-type transistors.

In some embodiments, as shown in fig. 2, the driving current regulation module 1022 includes: driving a current regulation resistor; in fig. 2, each of the second sub-driving circuits 4 includes a first driving current regulating resistor R1, a second driving current regulating resistor R2, and a third driving current regulating resistor R3, respectively;

in different second sub-driving circuits 4, the resistance values of the driving current regulation resistors are different. In fig. 2, the resistances of the first driving current regulating resistor R1, the second driving current regulating resistor R2, and the third driving current regulating resistor R3 are different.

The embodiment of the application provides a drive circuit, drive current regulation and control module includes drive current regulation and control resistance to can make the size of the drive current that the second sub-drive circuit provided to light emitting device and the size of the drive current that first sub-drive circuit provided to light emitting device inequality, and because in different second sub-drive circuits, drive current regulation and control resistance is inequality, thereby can realize that different second sub-drive circuits are also inequality to the size of the drive current that light emitting device provided. The driving current generated by the driving current generating module in different sub-driving circuits is different, so that the light-emitting device has different light-emitting brightness under the control of different sub-driving circuits.

In specific implementation, taking the driving circuit shown in fig. 2 as an example, that is, the driving circuit includes 4 sub-driving circuits 1, where the resistance of the first driving current regulation resistor R1 is smaller than the resistance of the second driving current regulation resistor R2, and the resistance of the second driving current regulation resistor R2 is smaller than the resistance of the third driving current regulation resistor R3, so that the driving currents provided by the sub-driving circuits to the light emitting device are sequentially reduced from left to right, that is, when the first sub-driving circuit drives the light emitting device to emit light, the luminance of the light emitting device is the highest, and when the second sub-driving circuit including the third driving current regulation resistor R3 drives the light emitting device to emit light, the luminance of the light emitting device is the lowest. Accordingly, the aspect ratio of the second transistor in each sub-driving circuit decreases from left to right in sequence.

In some embodiments, as shown in fig. 3, in the first sub-driving circuit 3, the driving current generation module further includes: a current limiting resistor R';

the current limiting resistor R' is coupled to the second terminal of the power selection switch 1021 and the light emitting device 2;

the resistance value of the current limiting resistor R' is different from the resistance value of each driving current regulating resistor.

In a specific implementation, when the power selection switch includes a second transistor, as shown in fig. 3, the current limiting resistor R' is coupled to the drain of the second transistor T2.

In the driving circuit provided by the embodiment of the application, the driving current generation module of the first sub-driving circuit further comprises a current-limiting resistor, so that the light-emitting device can be protected, and the phenomenon that the light-emitting device is damaged due to overlarge driving current generated by the power supply selection switch according to a power supply signal is avoided. And because the resistance value of the current-limiting resistor R' is different from the resistance value of each driving current regulating resistor, the driving currents generated by the driving current generating modules in different sub-driving circuits can be different, and thus, one light-emitting device has different light-emitting brightness under the control of different sub-driving circuits respectively.

In some embodiments, the resistance of the current limiting resistor R' is smaller than the resistance of the driving current regulating resistor.

In specific implementation, as shown in the driving circuit shown in fig. 3, the resistance of the current limiting resistor R' is smaller than the resistance of the first driving current regulating resistor R1, the resistance of the first driving current regulating resistor R1 is smaller than the resistance of the second driving current regulating resistor R2, and the resistance of the second driving current regulating resistor R2 is smaller than the resistance of the third driving current regulating resistor R3, so that the driving currents provided by the sub-driving circuits to the light emitting device are sequentially reduced from left to right, that is, when the first sub-driving circuit drives the light emitting device to emit light, the luminance of the light emitting device is highest, and when the second sub-driving circuit including the third driving current regulating resistor R3 drives the light emitting device to emit light, the luminance of the light emitting device is lowest. Accordingly, the aspect ratio of the second transistor in each sub-driving circuit decreases from left to right in sequence.

In some embodiments, as shown in FIGS. 1-3, the sub-driver circuit further includes: a first capacitor C;

a first stage of the first capacitor C is coupled to the second terminal of the driving switch 1011 and the control terminal of the power selection switch 1021, and a second stage of the first capacitor C is coupled to the second terminal of the power selection switch 1021.

As shown in fig. 2 and 3, a first stage of the first capacitor C is coupled to the drain of the first transistor T1 and the gate of the second transistor T2, and a second stage of the first capacitor C is coupled to the drain of the second transistor T2.

In some embodiments, the light emitting device comprises a micro-sized light emitting diode.

In some embodiments, the Micro-sized Light Emitting Diode may be, for example, a Mini Light Emitting Diode (Mini-LED) or a Micro Light Emitting Diode (Micro-LED).

It should be noted that the Mini-LEDs and the Micro-LEDs have small sizes and High brightness, and can be applied to a large number of display devices or backlight modules thereof, and the High-Dynamic Range (HDR) image can be displayed by finely adjusting the backlight. For example, typical dimensions (e.g., length) of Micro-LEDs are less than 100 microns; typical dimensions (e.g. length) of the Mini-LED are between 80 and 350 microns.

In a specific implementation, each light emitting device includes a positive electrode (+) and a negative electrode (-) or alternatively referred to as an anode and a cathode, and the sub-driving circuit is coupled to the positive electrode of the light emitting device; in some embodiments, the negative electrode of the light emitting device is grounded.

As shown in fig. 4, a light-emitting substrate provided in an embodiment of the present application includes: a substrate base plate 5 and a plurality of light emitting units 6 arranged in an array on the substrate base plate 5;

each of the light emitting units 6 includes the driving circuit provided in the embodiment of the present application.

It should be noted that the light-emitting substrate provided in the embodiments of the present application may be applied to a display device as a backlight unit, or may be used alone as a substrate having a display function or a light-emitting function, which is not limited in the embodiments of the present application.

In some embodiments, the light emitting substrate further comprises: a first data driving core Source IC;

the first data driving chip Source IC is configured to: and respectively providing a data signal to each sub-drive circuit in the drive circuit according to the current required brightness of the light-emitting device, so that a drive current generation module in the sub-drive circuit matched with the brightness generates a drive current according to a power signal of a power signal end, and the power signal end and the light-emitting device are disconnected through the rest sub-drive circuits in each drive circuit.

I.e., the first data driving core, serves as a data signal terminal for supplying a data signal to the driving circuit. In specific implementation, the data driving chip is coupled to the driving circuit through the light emitting driving data line.

In some embodiments, the light emitting substrate further comprises: a first scan driving circuit; the first scan driving circuit supplies a scan signal to the driving circuit, i.e., the first scan driving circuit serves as a scan signal terminal. In specific implementation, the first scan driving circuit is coupled to the driving circuit through the light-emitting driving scan lines.

In some embodiments, the light emitting substrate further includes a first driving power supply; the first driving power supply supplies a power supply signal to the driving circuit. Namely, the first driving power supply serves as a power signal terminal. In one embodiment, the first driving power source is coupled to the driving circuit via a power bus.

In particular implementations, the base substrate may be, for example, a glass substrate. A reflective layer may also be disposed between the base substrate and the driver circuit.

In the implementation, a Dual Gate (Dual Gate) design, a Triple Gate (Triple Gate) design, or the like may be adopted. Different scanning lines can be utilized to drive different pixel units, and partial adjacent pixel units driven by different scanning lines can be electrically connected with the same data line, so that the number of the data lines can be reduced, the number of driving chips can be reduced, and the cost of the driving chips can be saved.

Next, preparation of the light-emitting substrate provided in the embodiment of the present application is exemplified. The preparation of the light-emitting substrate comprises the following steps:

s101, sputtering and depositing a layer of metal on a glass substrate to serve as a reflecting layer, and forming an insulating layer on the reflecting layer to serve as a buffer layer;

the material of the reflective layer includes, for example, aluminum, and the material of the insulating layer includes, for example, silicon nitride;

s102, forming each film layer of a sub-drive circuit in the drive circuit and each film layer of a scanning drive circuit on the buffer layer by utilizing a photoetching technology;

s103, installing a Mini-LED to enable the Mini-LED to be coupled with the sub-driving circuit;

s104, forming an insulating layer on the Mini-LED, forming a metal grid pattern on the insulating layer by utilizing a photoetching technology, and forming an encapsulation layer on the metal grid;

the Mini-LEDs arranged in the array can be divided into a plurality of groups, the metal grids divide areas according to each group of Mini-LEDs, the metal grids are used for gathering light of the Mini-LEDs and supporting the packaging layer, mutual interference among the Mini-LEDs in different areas is reduced, the thickness of the metal grids is related to the distance between the Mini-LEDs, and for example, the thickness of the metal grids is larger than the optical coupling distance between two Mini-LEDs.

As shown in fig. 5, a display device provided in an embodiment of the present application includes: the light-emitting substrate 7 provided by the embodiment of the application and the display panel 8 positioned on the light-emitting side of the light-emitting substrate 7.

In particular implementation, for example, the display panel has a display side P1 and a non-display side P2 opposite to the display side P1, and the light emitting substrate is disposed at the non-display side P2 of the display panel as a backlight unit. For example, the light emitting substrate may provide a backlight to the display panel as a surface light source. For example, the display panel may be an LCD panel, an electronic paper display panel, or the like, which is not limited in the embodiments of the present application.

When the display panel is an LCD panel, the display panel includes, for example: the liquid crystal display device comprises an array substrate and an opposite substrate which are arranged opposite to each other, and a liquid crystal layer positioned between the array substrate and the opposite substrate.

In some embodiments, the display device further comprises: and an optical film positioned between the light emitting substrate and the display panel.

In some embodiments, the optical film sheet includes one or a combination of a prismatic film, an incremental film, a reflective sheet. Of course, in specific implementation, other optical films may be disposed according to actual needs.

In some embodiments, the display panel includes: pixel groups corresponding to the light emitting units one to one; each of the pixel groups includes a plurality of pixels.

In a specific implementation, the pixel includes a pixel driving circuit, for example, and the display panel may include a second scan driving circuit and a second data driving chip, wherein the second data driving chip provides a display data signal to the pixel driving circuit through the pixel data line, and the second scan driving circuit provides a display scan signal to the pixel driving circuit through the pixel scan line.

In a specific implementation, the first scan driving circuit and the second scan driving circuit may use, for example, a Gate Driver on Array (GOA) circuit process, that is, the Gate driving circuit is directly fabricated on the Array substrate.

Next, an example of implementing display by the display device provided in the embodiment of the present application is described. Taking the driving circuit shown in fig. 2 as an example, before a frame of picture signal arrives, the driving power is turned off, and the zero level is maintained until all the second transistors T2 are maintained in the correct switching state. And then the driving power supply is recovered to supply power, the light-emitting unit of the light-emitting substrate works normally, the liquid crystal display panel performs line-by-line scanning, the data signal of the liquid crystal display panel is transmitted to each pixel, and the liquid crystal is controlled to turn over at a correct angle, so that a correct picture is displayed. In an implementation, for example, a display device with a 60 hertz (Hz) refresh rate, i.e., 60 refreshes per second, the time of one frame is about 16.7 milliseconds (ms), only 15ms in the 16.7ms is the real scanning time, and 1.7ms is the blanking time, and the driving circuit of the whole light-emitting substrate is charged and kept until the next frame arrives.

The display device provided by the embodiment of the application is as follows: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, electronic paper, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the present application. The implementation of the display device can be seen in the above embodiments of the light emitting substrate, and repeated descriptions are omitted.

In summary, according to the driving circuit, the light emitting substrate and the display device provided in the embodiments of the present application, the driving circuit includes a plurality of sub-driving circuits, and different sub-driving circuits can generate different driving currents according to the driving control signal. Thus, when the light emitting device is driven to emit light, different sub-driving circuits can respectively supply different light emitting currents to the light emitting device. Namely, under the drive of different sub-drive circuits, the light-emitting brightness of the light-emitting device is different. Therefore, under the drive of different sub-drive circuits, one light-emitting device can generate a plurality of brightness levels to realize local dimming. When the driving circuit provided by the embodiment of the application is applied to the light-emitting substrate, the total number of light-emitting devices in the light-emitting substrate can be saved, and the cost can be saved. And, since one light emitting device is controlled by a plurality of sub driving circuits, only one sub driving circuit among the plurality of sub driving circuits supplies a driving current to the light emitting device, it is possible to improve the life span of each sub driving circuit.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (10)

1. A driver circuit, characterized in that the driver circuit comprises: a plurality of sub-driving circuits, and a light emitting device coupled to each of the sub-driving circuits;

each sub-driving circuit is coupled to the same scanning signal end and the power signal end; each sub-driving circuit is coupled with different data signal terminals;

each of the sub-driving circuits includes: the driving control module and the driving current generation module;

the drive control module is used for generating a drive control signal according to the data signal;

and the driving current generation module is used for generating driving current for controlling the light emitting device to emit light according to the driving control signal and a power supply signal end.

2. The driving circuit according to claim 1, wherein the plurality of sub-driving circuits comprises: a first sub-driving circuit, and at least one second sub-driving circuit;

in each of the first sub-driving circuits and each of the second sub-driving circuits, the driving control module includes a driving switch, and the driving current generating module includes: a power supply selection switch;

in each of the second sub-driving circuits, the driving current generation module further includes: a driving current regulation module;

the control end of the driving switch is coupled with the scanning signal end, the first end of the driving switch is coupled with the data signal end, and the second end of the driving switch is coupled with the control end of the power supply selection switch;

the first end of the power supply selection switch is coupled with the power supply signal end;

in the first sub-driving circuit, a second terminal of the power supply selection switch is coupled to the light emitting device;

in the second sub-driving circuit, a second terminal of the power supply selection switch is coupled to the driving current regulation and control module.

3. The drive circuit according to claim 2, wherein the drive switch comprises a first transistor; the power supply selection switch includes a second transistor;

a gate of the first transistor is coupled to the scan signal terminal, a source of the first transistor is coupled to the data signal terminal, and a drain of the first transistor is coupled to a gate of the second transistor;

the source electrode of the second transistor is coupled with the power supply signal end;

in the first sub-driving circuit, a drain of the second transistor is coupled to the light emitting device;

in the second sub-driving circuit, a drain of the second transistor is coupled to the driving current regulation and control module.

4. The driving circuit of claim 2, wherein the driving current regulation module comprises: driving a current regulation resistor;

in different second sub-driving circuits, the resistance values of the driving current regulation resistors are different.

5. The driving circuit according to claim 4, wherein in the first sub-driving circuit, the driving current generation module further comprises: a current limiting resistor;

the current limiting resistor is coupled with the second end of the power supply selection switch and the light-emitting device;

the resistance value of the current limiting resistor is different from the resistance value of each driving current regulating resistor.

6. The driving circuit of claim 2, wherein the sub-driving circuit further comprises: a first capacitor;

the first stage of the first capacitor is coupled to the second terminal of the driving switch and the control terminal of the power supply selection switch, and the second stage of the first capacitor is coupled to the second terminal of the power supply selection switch.

7. The driving circuit of claim 1, wherein the light emitting device comprises a micro-sized light emitting diode.

8. A light-emitting substrate, comprising: the light-emitting device comprises a substrate and a plurality of light-emitting units arranged in an array manner on the substrate;

each of the light emitting cells includes the driving circuit according to any one of claims 1 to 7.

9. The light-emitting substrate according to claim 8, further comprising: a data driving chip;

the data driving chip is configured to: and respectively providing a data signal to each sub-drive circuit in the drive circuit according to the current required brightness of the light-emitting device, so that a drive current generation module in the sub-drive circuit matched with the brightness generates a drive current according to a power signal of a power signal end, and the power signal end and the light-emitting device are disconnected through the rest sub-drive circuits in each drive circuit.

10. A display device, characterized in that the display device comprises: a light-emitting substrate according to any one of claims 8 to 9, and a display panel located on a light-emitting side of the light-emitting substrate.

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