Driver circuit, backlight module and driving method therefor and display device

Abstract

The present disclosure presents a driver circuit, a backlight module, and a driver method therefor, as well as a display device. The driver circuit comprises a driver transistor and a voltage regulation circuit; wherein the source of the driver transistor is coupled to the first voltage signal terminal, the drain of the driver transistor is coupled to the light source group, and the gate of the driver transistor is coupled to the output terminal of the voltage regulation circuit; wherein the light source group comprises a plurality of light-emitting regions arranged along the first direction, and wherein the light-emitting region comprises at least one light source; wherein the first input terminal of the voltage regulation circuit is coupled to the second voltage signal terminal; wherein the voltage of the second voltage signal terminal is a preset drive voltage Vgs of the driver transistor.wherein the voltage regulation circuit is configured to output the drive voltage Vgs' of the driver transistor corresponding to the input preset drive voltage, the number of light-emitting regions included in the light-emitting element group, and the preset number when the number of light-emitting regions included in the light-emitting element group is not equal to the preset number; where Vgs' is not equal to Vgs.;

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of display technology, and more particularly to a driving circuit, a backlight module and a driving method therefor, and a display device. STATE OF THE ART

[0002] With the continuous advancement of display technology, LCD panels can utilize mini-LEDs as the light source of the backlight module to achieve large-format, high-resolution displays. The backlight source includes multiple mini-LED light source groups. Each mini-LED light source group includes multiple zones, each zone containing at least one mini-LED. The multiple mini-LED light source groups are each driven by different driver circuits, and each light source group is assigned the same drive current.However, to meet the structural and viewing area requirements of the display device, the display device typically has a cut corner, and the number of zones in the mini-LED lamp group corresponding to the cut corner is less than the number of zones in the mini-LED lamp group in the area excluding the cut corner. If the same drive current is assigned to each mini-LED lamp group, the drive current for a mini-LED lamp group is evenly distributed among multiple zones in the mini-LED lamp group.Because the number of zones in the mini LED lamp group corresponding to the cut corner is smaller than the number of zones in the mini LED lamp group in the area except the cut corners, the current of a zone in the mini LED lamp group corresponding to the cut corner is greater than the current of a zone in the mini LED lamp group in the area except the cut corners. Therefore, the brightness of the mini LED in the mini LED lamp group corresponding to the cut corner is greater than the brightness of the mini LED in the mini LED lamp group in the area except the cut corners, resulting in brightness differences in different areas of the backlight module and affecting the display effect. DISCLOSURE OF THE INVENTION

[0003] An embodiment of the present disclosure provides a driver circuit, the driver circuit comprising: a driver transistor and a voltage regulator circuit;

[0004] The source of the driver transistor is coupled to the first voltage signal terminal, the drain of the driver transistor is used for coupling to the light source group, and the gate of the driver transistor is coupled to the output terminal of the voltage regulation circuit; wherein the light source group comprises a plurality of light-emitting regions arranged along the first direction, and wherein the light-emitting region comprises at least one light source;

[0005] The first input terminal of the voltage regulation circuit is coupled to the second voltage signal terminal; the voltage of the second voltage signal terminal is a preset drive voltage Vgs of the drive transistor; the number of light-emitting regions comprised by the lamp group is less than, equal to, or greater than a preset number;

[0006] The voltage control circuit is used to output the driving voltage Vgs' of the driving transistor according to the inputted preset driving voltage, the number of light-emitting areas included in the lamp group and the preset number when the number of light-emitting areas included in the lamp group is not equal to the preset number; where Vgs' is not equal to Vgs .

[0007] In some embodiments, the drive voltage Vgs' of the driver transistor and the preset drive voltage Vgs are: Vgs'=mn(Vgs−Vth)+Vth; where m is the number of light-emitting regions comprised by the lamp group, n is the preset number, and Vth is the threshold voltage of the driver transistor.

[0008] In some embodiments, the voltage regulation circuit comprises a first operational amplifier and a second operational amplifier;

[0009] The non-inverting input terminal of the first operational amplifier is coupled to the second voltage signal terminal, the inverting input terminal of the first operational amplifier is coupled to the positive electrode of the fixed voltage source, the inverting input terminal of the second operational amplifier and the output terminal of the second operational amplifier, and the output terminal of the first operational amplifier is coupled to the inverting input terminal of the second operational amplifier;

[0010] The negative electrode of the fixed voltage source is grounded, and the voltage of the fixed voltage source is the threshold voltage Vth of the driver transistor.

[0011] The gain of the first operational amplifier is mn;

[0012] A non-inverting input terminal of the second operational amplifier is grounded, and an output terminal of the second operational amplifier is coupled to a gate of the driver transistor.

[0013] In some embodiments, the voltage regulation circuit further comprises a first resistor, a second resistor, a third resistor, and a fourth resistor;

[0014] A first terminal of the first resistor is coupled to an output terminal of the first operational amplifier, and a second terminal of the first resistor is coupled to an inverting input terminal of the second operational amplifier;

[0015] A first terminal of the second resistor is coupled to the inverting input terminal of the first operational amplifier, and a second terminal of the second resistor is coupled to the inverting input terminal of the second operational amplifier;

[0016] A first terminal of the third resistor is coupled to the output terminal of the second operational amplifier, and a second terminal of the third resistor is coupled to the inverting input terminal of the second operational amplifier;

[0017] A first terminal of the fourth resistor is grounded, and a second terminal of the fourth resistor is coupled to a non-inverting input terminal of the second operational amplifier;

[0018] The resistance values ​​of the first resistor, the second resistor, the third resistor and the fourth resistor are all the same.

[0019] In some embodiments, the voltage regulation circuit further comprises: a filter capacitor; a first electrode of the filter capacitor is coupled to the positive electrode of the fixed voltage source and the first terminal of the second resistor, and a second electrode of the filter capacitor is grounded.

[0020] In some embodiments, the voltage regulation circuit further comprises: a first pulse modulation switch; a first terminal of the first pulse modulation switch is coupled to the second voltage signal terminal, and a second terminal of the first pulse modulation switch is coupled to the non-inverting input terminal of the first operational amplifier.

[0021] In some embodiments, the driver circuit further comprises a pulse modulation circuit connected in parallel to the first input terminal and the output terminal of the voltage regulation circuit.

[0022] In some embodiments, the pulse modulation circuit comprises: a second pulse modulation switch and a third pulse modulation switch;

[0023] The first terminal of the second pulse modulation switch is coupled to the second voltage signal terminal, the second terminal of the second pulse modulation switch is coupled to the first terminal of the third pulse modulation switch and the gate of the driver transistor; the second terminal of the third pulse modulation switch is grounded.

[0024] In some embodiments, the driver circuit further comprises: a third operational amplifier and a fourth operational amplifier;

[0025] The non-inverting input terminal of the third operational amplifier is coupled to the second voltage signal terminal, the inverting input terminal of the third operational amplifier is coupled to the source of the driver transistor, and the output terminal of the third operational amplifier is coupled to the non-inverting input terminal of the fourth operational amplifier;

[0026] The inverting input terminal of the fourth operational amplifier is coupled to the output terminal of the fourth operational amplifier, and the output terminal of the fourth operational amplifier is coupled to the first input terminal of the voltage regulation circuit.

[0027] In some embodiments, the driver circuit further comprises: an operational amplifier circuit and a fifth resistor; a first input terminal of the operational amplifier circuit is coupled to the second voltage signal terminal, a second input terminal of the operational amplifier circuit is coupled to the current multiplier adjustment signal terminal, a third input terminal of the operational amplifier circuit is coupled to the first terminal of the fifth resistor, and an output terminal of the operational amplifier circuit is coupled to the non-inverting input terminal of the third operational amplifier;

[0028] A second terminal of the fifth resistor is grounded.

[0029] In some embodiments, the driver circuit further comprises: a feedback circuit; the feedback circuit comprises a feedback resistor;

[0030] The first terminal of the feedback resistor is coupled to the source of the driver transistor, and the second terminal of the feedback resistor is coupled to the first voltage signal terminal; the first voltage signal terminal is a ground potential signal terminal.

[0031] In some embodiments, the driver transistor is an N-type metal oxide semiconductor field effect transistor.

[0032] An embodiment of the present disclosure provides a backlight module comprising: a plurality of light source groups and a plurality of first drive circuits; the first drive circuit is the drive circuit provided in an embodiment of the present disclosure;

[0033] The luminous element group comprises a plurality of light-emitting regions arranged along a first direction, wherein the light-emitting region comprises at least one luminous element;

[0034] The plurality of light source groups comprise a plurality of first light source groups and a plurality of second light source groups; the number of light-emitting regions comprised by the second light source group is equal to a preset number, and the number of light-emitting regions comprised by the first light source group is smaller than the number of light-emitting regions comprised by the second light source group;

[0035] The plurality of first light source groups are each coupled to different first driver circuits.

[0036] In some embodiments, the plurality of second light source groups are each coupled to different first driver circuits.

[0037] In some embodiments, the backlight module further comprises a plurality of second driver circuits; the plurality of second light source groups are each coupled to different second driver circuits;

[0038] The second driver circuit includes: a driver transistor, a pulse modulation circuit, a voltage stabilization circuit, a feedback circuit, an operational amplifier circuit, and a fifth resistor.

[0039] The embodiment of the present disclosure presents a driving method for a backlight module, the method comprising: Driving a driver circuit coupled to the first group of lamps to input a preset driver voltage; Driving the voltage control circuit to output a driving voltage of the driving transistor according to the preset driving voltage, the number of light-emitting regions, and the preset number to drive the driving transistor to turn on, so that the lamps in the first lamp group are driven to emit light.

[0040] In some embodiments, the voltage regulation circuit comprises a first pulse modulation switch which, when a driver circuit coupled to the first group of lamps is controlled to input a preset drive voltage, is also controlled to turn on in order to apply a preset drive voltage to the first input terminal of the voltage regulation circuit via the first pulse modulation switch.

[0041] In some embodiments, the driver circuit further comprises a second pulse modulation switch and a third pulse modulation switch, which, when the first pulse modulation switch is driven to turn on, are also driven to turn off the second pulse modulation switch and the third pulse modulation switch.

[0042] In some embodiments, the plurality of second light source groups are each coupled to different driver circuits, and the method further comprises: Driving the first pulse modulation switch of a driver circuit coupled to the first lamp group to turn off, and driving the second pulse modulation switch to turn on; driving the driver transistor to turn on, thereby driving the lamps in the second lamp group to emit light.

[0043] An embodiment of the present disclosure provides a display device comprising: a backlight module provided according to an embodiment of the present disclosure; a display panel located on the light-emitting side of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly describe the technical solutions in the present disclosure, the accompanying drawings to be used in some embodiments of the present disclosure are briefly presented below. Obviously, the accompanying drawings described below represent only some embodiments of the present disclosure, and a person skilled in the art can also obtain other drawings based on these drawings without inventive work. Fig. 1 is a schematic structural diagram of a backlight module provided in an embodiment of the present disclosure; Fig. 2 is a schematic structural diagram of a driver circuit provided in an embodiment of the present disclosure; Fig. 3 is a schematic structural diagram of another driver circuit provided in an embodiment of the present disclosure; Fig. 4 is a schematic structural diagram of another driver circuit provided in an embodiment of the present disclosure; Fig. 5 is a schematic structural diagram of another driver circuit provided in an embodiment of the present disclosure; Fig. 6 is a schematic structural diagram of another driver circuit provided in an embodiment of the present disclosure; Fig. 7 is a schematic structural diagram of another driver circuit provided in an embodiment of the present disclosure; Fig. 8 is a schematic structural diagram of another driver circuit provided in an embodiment of the present disclosure; Fig. 9 is a schematic structural diagram of another driver circuit provided in an embodiment of the present disclosure; Fig. 10 is a schematic structural diagram of another backlight module provided in an embodiment of the present disclosure; Fig. 11 is a schematic structural diagram of another backlight module provided in an embodiment of the present disclosure; Fig. 12 is a schematic structural diagram of another backlight module provided in an embodiment of the present disclosure; Fig. 13 is a schematic flow diagram of the method for driving a backlight module provided in an embodiment of the present disclosure; Fig. 14 is a schematic structural diagram of a display device provided in an embodiment of the present disclosure; Fig. 15 is a schematic structural diagram of another display device provided in an embodiment of the present disclosure. EMBODIMENTS OF THE INVENTION

[0045] In order to make the purpose, technical solution, and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure and not all embodiments. Furthermore, the embodiments in the present disclosure and the features in the embodiments can be combined with each other as long as there are no conflicts therebetween. Based on the described embodiments of the present disclosure, any other embodiments obtained by those skilled in the art without inventive work fall within the scope of the present disclosure.

[0046] Unless otherwise defined, technical or scientific terms used in this disclosure should have the general meaning understood by a person having ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not indicate order, quantity, or importance, but are used only to distinguish various components. The words "comprise" or "include," and the like, mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. The words "connected" or "attached," and the like, are not limited to physical or mechanical connections, but can also include electrical connections, whether direct or indirect.

[0047] Please note that the size and shape of the individual figures in the accompanying drawings do not reflect actual proportions and are intended solely to illustrate the content of the present disclosure. The same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout.

[0048] In the state of the art, Fig. 1, for example, shows a non-rectangular backlight module in which the backlight module 7 has a shape resembling a rectangle with truncated corners, that is, a shape in which the rectangular portion of the rectangle is truncated. The plurality of light source groups 4 include a plurality of first light source groups 8 and a plurality of second light source groups 9; the first light source group 8 is located in the area corresponding to the truncated corner, and the second light source group 9 is located in the area outside the truncated corner. The number of light-emitting regions 5 in the first light source group 8 is smaller than the number of light-emitting regions in the second light source group 9. The number of light-emitting regions included in the second light source group 9 is the preset number.That is, due to the cut corner, the number of light-emitting regions 5 included in the first lamp group 8 and located in the area corresponding to the cut corner is smaller than the preset number. In a specific implementation, it is necessary to use a driving transistor to drive the lamp group to emit light, and the driving current of the driving transistor, that is, the total current I of each lamp group, must meet the following conditions: I=(1 / 2)UnCox (W / L)*(V'−Vth)2 where Un is the electron migration rate, Cox is the gate oxide layer capacitance per unit area, W / L is the width-to-length ratio of the oxide layer of the driver transistor, V' is the gate voltage of the driver transistor, and Vth is the threshold voltage of the driver transistor. In the example of the first lamp group 8, which corresponds to the reference numeral in Fig. 1, the first lamp group 8 comprises four light-emitting areas, and the second lamp group 8 eighth light-emitting areas, the driving current of each light-emitting area in the order corresponding to the reference numeral in Fig. 1 corresponding first lamp group 8 is I / 4, and the driving current of each light-emitting region in the second lamp group 8 is I / 8, the driving current of each light-emitting region in the first lamp group 8 is greater than the driving current of each light-emitting region in the second lamp group 9, the brightness of each light-emitting region in the respective first lamp group 8 is greater than the brightness of each light-emitting region in the second lamp group 9, there are relatively large brightness differences between the areas of the cut corners and the area other than the cut corners, thereby deteriorating the brightness uniformity of the backlight module, and in turn deteriorating the display uniformity of the display product when the backlight module is inserted into the display product.

[0049] The embodiment of the present disclosure presents a driver circuit, wherein the driver circuit 1, as shown in Fig. 2, comprising: a driver transistor 2 and a voltage regulating circuit 3;

[0050] The source S of the driver transistor 2 is coupled to the first voltage signal terminal V1, the drain g of the driver transistor 2 is used for coupling to the light-emitting device group 4, and the gate g of the driver transistor 2 is coupled to the output terminal of the voltage regulation circuit 1; wherein the light-emitting device group 4 comprises a plurality of light-emitting regions 5 arranged along the first direction Y, and wherein the light-emitting region 5 comprises at least one light-emitting device 6; the number of light-emitting regions 5 comprised by the light-emitting device group 4 is less than, equal to, or greater than a preset number;

[0051] The first input terminal of the voltage regulation circuit 3 is coupled to the second voltage signal terminal Vref; the voltage of the second voltage signal terminal Vref is a preset drive voltage Vgs of the drive transistor 2;

[0052] The voltage control circuit 3 serves to output the driving voltage Vgs' of the driving transistor 2 according to the inputted preset driving voltage, the number of light-emitting regions 5 comprised by the lamp group 4 and the preset number when the number of light-emitting regions 5 comprised by the lamp group 4 is not equal to the preset number; where Vgs' is not equal to Vgs.

[0053] The driving circuit provided in the embodiment of the present disclosure includes a voltage regulating circuit that can regulate the input preset driving voltage according to the number of light-emitting regions in the lamp group coupled to the driving circuit and the preset number, so that the driving voltage Vgs' of the driving transistor output from the voltage regulating circuit is not equal to the preset driving voltage Vgs; In this way, the total driving current of the lamp group is not equal to the total driving current corresponding to the preset driving voltage Vgs.Compared with the case where the preset driving voltage Vgs is used to drive the driving transistor to turn on, driving the lamp group to emit light, the light emission brightness of each lamp in the lamp group can be increased or decreased, thereby avoiding large brightness differences between different areas of the backlight module and affecting the brightness uniformity of the backlight module.

[0054] In some embodiments, when the number of light-emitting regions included in the lamp group is less than a preset number, the voltage regulating circuit is used to output a driving voltage Vgs' of the driving transistor according to the inputted preset driving voltage, the number of light-emitting regions included in the lamp group, and the preset number; where Vgs' < Vgs.

[0055] In the driving circuit provided in the embodiment of the present disclosure, when the number of light-emitting regions included in the lamp group coupled to the driving circuit is smaller than the preset number, the voltage regulating circuit may adjust the input preset driving voltage according to the number of light-emitting regions in the lamp group coupled to the driving circuit and the preset number, so that the voltage regulating circuit outputs the driving voltage Vgs' of the driving transistor < the preset driving voltage Vgs. Accordingly, the total driving current of the lamp group is smaller than the total driving current corresponding to the preset driving voltage Vgs.Compared with the case where the preset driving voltage Vgs is used to drive the driving transistor to turn on so as to drive the lamp group to emit light, the light emission brightness of each lamp in the lamp group can be reduced, thereby avoiding the relatively large brightness difference between different areas of the backlight module and thus avoiding the deterioration of the brightness uniformity of the backlight module.

[0056] Obviously, a group of lamps in Fig. 2 can also be a lamp group with a number of light-emitting regions that is greater than a preset number. When the number of light-emitting regions included in the lamp group is greater than a preset number, in some embodiments, the voltage regulating circuit is used to: output a drive voltage Vgs' of the drive transistor according to an input preset drive voltage, the number of light-emitting regions included in the lamp group, and the preset number; where Vgs' > Vgs.

[0057] With the driving circuit provided in the embodiment of the present disclosure, when the number of light-emitting regions included in the lamp group coupled to the driving circuit is greater than a preset number, the total driving current of the lamp group becomes greater than the total driving current corresponding to the preset driving voltage Vgs. Compared with the case where the preset driving voltage Vgs is used to drive the driving transistor to turn on and drive the lamp group to emit light, the light emission brightness of each lamp in the lamp group can be increased, thereby avoiding large brightness differences between different regions of the backlight module and deteriorating the brightness uniformity of the backlight module.

[0058] Note that for simplicity, the lamp group whose number of light-emitting areas does not match the preset number is referred to as the first lamp group, and the lamp group whose number of light-emitting areas matches the preset number is referred to as the second lamp group. The second lamp group must also be coupled to the driver transistor so that the lamps in the second lamp group can be controlled to emit light via the driver transistor.

[0059] In a specific implementation, the first lamp group is typically located at the edge of the backlight module, and the number of the first lamp group is typically less than the number of the second lamp group. By adjusting the drive voltage of the first lamp group instead of adjusting the drive voltage of the second lamp group, the design and drive complexity of the backlight module can be reduced.

[0060] In a specific implementation, the drive voltage of the driver transistor coupled to the second lamp group is a preset drive voltage Vgs. Accordingly, the drive current of the driver transistor coupled to the second lamp group, i.e., the total drive current of the second lamp group, is Id=(1 / 2)UnCox (W / L) * (Vgs-Vth) 2. The number of light-emitting areas comprised by the second lamp group is n, that is, the preset number is n; the driving current corresponding to each light-emitting area in the second lamp group is thus Idn When the driving voltage of the driving transistor in the driving circuit provided in the embodiment of the present disclosure is Vgs', the driving current of the driving transistor coupled to the first lamp group, i.e., the total driving current of the first lamp group, is Id'=(1 / 2)UnCox (W / L) * (Vgs'-Vth) 2 , the number of light-emitting areas comprised by the first lamp group is m, so the driving current corresponding to each light-emitting area in the first lamp group is I'm.

[0061] In some embodiments: Id'm=Id'n. Therefore, the driving current corresponding to each light-emitting region in the first lamp group is equal to the driving current corresponding to each light-emitting region in the second lamp group. The brightness of the lamps in each lamp group is the same, eliminating the brightness difference between different regions of the backlight module and achieving a uniform influence on the brightness of the backlight module.

[0062] In detail, this can be seen from Id'm=Idn Derive the following: (1 / 2)UnCox (W / L) (Vgs'−Vth)2m=(1 / 2)UnCox (W / L) (Vgs'−Vth)2n; (Vgs'−Vth)2m=(Vgs−V)2n.

[0063] Thus, for the drive voltage Vgs' of the driver transistor and the preset drive voltage Vgs, the following applies: Vgs'=mn(Vgs−Vth)+Vth.

[0064] That is, when the drive voltage of the drive transistor coupled to the second lamp group is the preset drive voltage Vgs and the first lamp group is coupled to the drive circuit provided in the embodiment of the present disclosure, the input preset drive voltage is adjusted by the voltage control circuit so that the drive voltage Vgs' of the drive transistor output from the voltage control circuit Vgs'=mn (Vgs-Vth) +Vth, so that the brightness of the lamps in the first lamp group can be the same as the brightness of the lamps in the second lamp group, thereby eliminating the brightness difference of different areas of the backlight module and achieving uniformity of influence on the brightness of the backlight module.

[0065] In some embodiments, as in Fig. 3, the voltage regulation circuit 3 comprises: a first operational amplifier 301 and a second operational amplifier 302;

[0066] The non-inverting input terminal of the first operational amplifier 301 is coupled to the second voltage signal terminal Vref, the inverting input terminal of the first operational amplifier 301 is coupled to the positive electrode of the fixed voltage source V2, the inverting input terminal of the second operational amplifier 302, and the output terminal of the second operational amplifier 302, and the output terminal of the first operational amplifier 301 is coupled to the inverting input terminal of the second operational amplifier 302;

[0067] The negative electrode of the fixed voltage source V2 is grounded, and the voltage of the fixed voltage source V2 is the threshold voltage Vth of the driver transistor;

[0068] The gain of the first operational amplifier 301 is mn, where m is the number of light-emitting areas and n is the preset number;

[0069] A non-inverting input terminal of the second operational amplifier 302 is grounded, and an output terminal of the second operational amplifier 302 is coupled to the gate g of the driver transistor 2.

[0070] In a specific implementation, the gain of the first operational amplifier is determined according to the number of light-emitting regions in the lamp group and a preset number. The non-inverting input terminal of the first operational amplifier serves as the first input terminal of the voltage regulation circuit. The voltage input to the non-inverting input terminal of the first operational amplifier is Vgs, and the voltage input to the inverting input terminal of the first operational amplifier is Vth. Since the gain of the first operational amplifier mn is, the voltage output from the output terminal of the first operational amplifier is V301=mn(Vgs−Vth). When the output terminal of the first operational amplifier outputs V301 and the inverting input terminal of the second operational amplifier 302 is also coupled to the positive electrode of the fixed voltage source V2 and the fixed voltage source V2 outputs Vth, V301 and Vth serve as the voltage input to the inverting input terminal of the second operational amplifier 302.

[0071] In some embodiments, as in Fig. 4, the voltage regulation circuit further comprises: a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4;

[0072] A first terminal of the first resistor R1 is coupled to the output terminal of the first operational amplifier 301, and a second terminal of the first resistor R1 is coupled to the inverting input terminal of the second operational amplifier 302;

[0073] A first terminal of the second resistor R2 is coupled to the inverting input terminal of the first operational amplifier 301, and a second terminal of the second resistor R2 is coupled to the inverting input terminal of the second operational amplifier 302;

[0074] A first terminal of the third resistor R3 is coupled to the output terminal of the second operational amplifier 302, and a second terminal of the third resistor R3 is coupled to the inverting input terminal of the second operational amplifier 302;

[0075] A first terminal of the fourth resistor R4 is grounded, and a second terminal of the fourth resistor R4 is coupled to the non-inverting input terminal of the second operational amplifier 302;

[0076] The resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are all the same.

[0077] In a special implementation for the Fig. In the voltage regulation circuit shown in Figure 4, V301 and Vth serve as the inverting input terminal of the second operational amplifier 302. When the output terminal of the first operational amplifier outputs V301, the inverting input terminal of the second operational amplifier 302 is also coupled to the positive electrode of the fixed voltage source V2, and the fixed voltage source V2 outputs Vth. Since the non-inverting input terminal of the second operational amplifier 302 is grounded via the fourth resistor, it can be concluded from the principle of virtual short circuit that the voltage V- at the inverting input terminal of the second operational amplifier 302 = the voltage V+ at the inverting input terminal of the second operational amplifier 302 = 0. The resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are all R.According to the principle of virtual isolation, the sum of the currents flowing through the second resistor R2 and the first resistor R1 is equal to the current flowing through the third resistor R3. Therefore, (V 301 - V-) / R + (Vth - V-) / R = (V 302 - V-) / R , where V 302 represents the voltage output from the output terminal of the second operational amplifier 302. Substituting V- = 0 into the equation, we get (V 301 - 0 ) / R + (Vth - 0 ) / R = (V 302 - 0 ) / R , and further we get. V302=V301+Vth=mn(Vgs−Vth)+Vth. The voltage V302 output from the output terminal of the second operational amplifier 302 is therefore the drive voltage Vgs' of the drive transistor. Therefore, by means of the voltage control circuit provided in the embodiment of the present disclosure, the preset drive voltage can be adjusted so that the drive voltage Vgs' of the drive transistor output from the voltage control circuit is Vgs'=mn(Vgs−Vth)+Vth adjusted so that the brightness of the lamps in the first lamp group can be equal to the brightness of the lamps in the second lamp group, and the brightness difference between different regions of the backlight module can be eliminated, thereby achieving uniformity of influence on the brightness of the backlight module. Furthermore, by setting the gain of the first operational amplifier according to the number of light-emitting regions in the lamp group and a preset number, the drive voltage of the drive transistor is adjusted using the voltage control circuit provided in the embodiment of the present disclosure. The method is simple, and the adjustment effect is accurate.

[0078] In some embodiments, the first operational amplifier is a programmable operational amplifier.

[0079] It should be noted that when the backlight module includes a plurality of lamp groups, and the plurality of lamp groups includes a plurality of first lamp groups, the plurality of first lamp groups must be coupled to different driver circuits. The n values ​​of the plurality of first lamp groups are the same, but the m values ​​of the plurality of first lamp groups may not be completely the same. For the first lamp groups with different m values, the gains of the first operational amplifiers in the respective driver circuits coupled to these lamp groups are also different.The first operational amplifier in the driver circuit provided by the embodiment of the present disclosure is a programmable operational amplifier, so that the gain of the first operational amplifier is specifically adjusted by programming according to the specific values ​​of m and n.

[0080] In some embodiments, the second operational amplifier is a negative feedback operational amplifier.

[0081] In some embodiments, as in Fig. 4, the voltage regulation circuit 3 further includes: a filter capacitor C1; a first electrode of the filter capacitor C1 is coupled to the positive electrode of the fixed voltage source V2 and the first terminal of the second resistor R2, and a second electrode of the filter capacitor C1 is grounded.

[0082] The driver circuit and the voltage regulation circuit provided in the embodiment of the present disclosure also include a filter capacitor so that the AC signal can be filtered out, which makes the working performance of the voltage regulation circuit more stable.

[0083] In some embodiments, as in the Fig. 3 and Fig. 4, the voltage regulation circuit 1 further comprises: a first pulse modulation switch PWM1; the first terminal of the first pulse modulation switch PWM1 is coupled to the second voltage signal terminal Vref, and the second terminal of the first pulse modulation switch PWM1 is coupled to the non-inverting input terminal of the first operational amplifier 301.

[0084] In a special implementation, when the drive voltage of the driver transistor is to be adjusted with the voltage control circuit, the first pulse modulation switch PWM1 is controlled to be turned on. If the drive voltage of the driver transistor is not to be adjusted with the voltage control circuit, the first pulse modulation switch PWM1 is then controlled to be turned off.

[0085] In some embodiments, as in Fig. 5, the driver circuit further comprises a pulse modulation circuit 10 connected in parallel to the first input terminal and the output terminal of the voltage regulating circuit 3.

[0086] In some embodiments, as in Fig. 5, the pulse modulation circuit 10 includes: a second pulse modulation switch PWM2 and a third pulse modulation switch PWM3;

[0087] The first terminal of the second pulse modulation switch PWM2 is coupled to the second voltage signal terminal Vref, the second terminal of the second pulse modulation switch PWM2 is coupled to the first terminal of the third pulse modulation switch PWM3 and the gate g of the driver transistor 2; the second terminal of the third pulse modulation switch PWM3 is grounded.

[0088] In a specific implementation, if the drive voltage of the driver transistor is to be adjusted with the voltage control circuit, the first pulse modulation switch PWM1 is controlled to be on, and the second pulse modulation switch PWM2 is controlled to be off. If the drive voltage of the driver transistor is not to be adjusted with the voltage control circuit, the first pulse modulation switch PWM1 is controlled to be off.In this case, the lamps in the lamp group can be controlled so that they do not light up by controlling the second pulse modulation switch PWM2 and the third pulse modulation switch PWM3 all to turn on, or the driving voltage can be supplied to the driving transistor via the second pulse modulation switch PWM2 by controlling the second pulse modulation switch PWM2 to turn on and the third pulse modulation switch PWM3 to turn off.

[0089] Note that, in order to facilitate manufacturing of the backlight module, the second lamp group may also be coupled to the driving circuit provided in the embodiment of the present disclosure. However, since the number of light-emitting regions in the second lamp group has not been reduced, there is no need to adjust the driving voltage of the driving transistor via the voltage control circuit. In this case, the first pulse modulation switch PWM1 may be controlled to be off, and the second pulse modulation switch PWM2 may be controlled to be on while the third pulse modulation switch PWM3 is off, so that a driving voltage is supplied to the driving transistor via the second pulse modulation switch PWM2, thereby driving the lamps in the second lamp group to emit light.

[0090] In some embodiments, as in Fig. 6, the driver circuit further includes: a voltage stabilizing circuit 11; the voltage stabilizing circuit 11 includes: a third operational amplifier 1102 and a fourth operational amplifier 1101;

[0091] The non-inverting input terminal of the third operational amplifier 1102 is coupled to the second voltage signal terminal Vref, the inverting input terminal of the third operational amplifier 1102 is coupled to the source s of the driver transistor 2, and the output terminal of the third operational amplifier 1102 is coupled to the non-inverting input terminal of the fourth operational amplifier 1101;

[0092] The inverting input terminal of the fourth operational amplifier 1101 is coupled to the output terminal of the fourth operational amplifier 1101, and the output terminal of the fourth operational amplifier 1101 is coupled to the first input terminal of the voltage regulation circuit 3.

[0093] In a special implementation, as in Fig. As shown in Figure 6, when the voltage regulation circuit 3 includes the first pulse modulation switch PWM1, the output terminal of the fourth operational amplifier 1101 is coupled via the first pulse modulation switch PWM1 to the non-inverting input terminal of the first operational amplifier 301. When the driver circuit 1 further includes a pulse modulation circuit 10, the output terminal of the fourth operational amplifier 1101 is also coupled to the first terminal of the second pulse modulation switch PWM2.

[0094] In some embodiments, as in Fig. 7, the driver circuit further comprises: an operational amplifier circuit and a fifth resistor R5; a first input terminal of the operational amplifier circuit is coupled to the second voltage signal terminal Vref, a second input terminal of the operational amplifier circuit is coupled to the current multiplier setting signal terminal ISET, a third input terminal of the operational amplifier circuit is coupled to the first terminal of the fifth resistor R5, and an output terminal of the operational amplifier circuit is coupled to the non-inverting input terminal of the third operational amplifier 1102;

[0095] A second terminal of the fifth resistor R5 is grounded.

[0096] In a specific implementation, a reference voltage is input to the first input terminal of the operational amplifier circuit, and the operational amplifier circuit adjusts the current multiplier of the reference voltage under the control of the current multiplier adjustment signal of the current multiplier adjustment signal terminal ISET and outputs the reference voltage after the current multiplier adjustment.

[0097] In some embodiments, as in Fig. As shown in Figure 8, the driver circuit further includes: a feedback circuit 12; the feedback circuit includes a feedback resistor R6;

[0098] The first terminal of the feedback resistor R6 is coupled to the source s of the driver transistor 2, and a second terminal of the feedback resistor R6 is coupled to the first voltage signal terminal V1; the first voltage signal terminal V1 is a signal terminal with ground potential.

[0099] In some embodiments, as in Fig. 9, the feedback circuit 12 further comprises a digital-to-analog converter DAC arranged between the feedback resistor R6 and the ground potential signal terminal.

[0100] In some embodiments, the driver transistor is a metal-oxide-semiconductor field-effect transistor. As in Fig. 2 to Fig. As shown in Figure 9, the driver transistor 2 in the example is an N-type metal-oxide-semiconductor field-effect transistor. Obviously, in a specific implementation, the driver transistor may also be a P-type metal-oxide-semiconductor field-effect transistor.

[0101] Based on the same inventive concept, the embodiment of the present disclosure further provides a backlight module, wherein the backlight module, as shown in Fig. 1 and Fig. 10, includes: a plurality of lamp groups 4 and a plurality of first drive circuits; the first drive circuit is the drive circuit 1 provided in the embodiment of the present disclosure;

[0102] The illuminant group 4 comprises a plurality of light-emitting regions 5 arranged along a first direction Y, wherein the light-emitting region 5 comprises at least one illuminant 6;

[0103] The plurality of light source groups 4 includes a plurality of first light source groups 8 and a plurality of second light source groups 9; the number of light-emitting regions 5 included in the second light source group 9 is equal to a preset number, and the number of light-emitting regions 5 included in the first light source group 8 is not equal to the number of light-emitting regions 5 included in the second light source group 9;

[0104] The plurality of first light source groups 8 are each coupled to different driver circuits 1 (ie first driver circuits).

[0105] The first driving circuit included in the backlight module provided in the embodiment of the present disclosure is the above-mentioned driving circuit provided in the embodiment of the present disclosure. Since the first driving circuit includes a voltage regulating circuit, the voltage regulating circuit can adjust the input preset driving voltage according to the number of light-emitting regions in the lamp group coupled to the first driving circuit and the preset number, so that the driving voltage Vgs' of the driving transistor output from the voltage regulating circuit is not equal to the preset driving voltage Vgs. When the first lamp group is coupled to the first driving circuit, the total driving current of the first lamp group is not equal to the total driving current corresponding to the preset driving voltage Vgs.Compared with the case where the preset driving voltage Vgs is used to drive the driving transistor to turn on to drive the first lamp group to emit light, the light emission brightness of each lamp in the first lamp group can be increased or decreased, thereby avoiding a large difference in the brightness of the lamps in the first lamp group and the second lamp group and avoiding deterioration of the brightness uniformity of the backlight module.

[0106] It should be noted that in Fig. 1, it is illustrated by way of example that the number of light-emitting regions 5 comprised by the first lamp group 8 is smaller than the number of light-emitting regions 5 comprised by the second lamp group 9. When the first lamp group is coupled to the first driver circuit, the voltage regulating circuit can adjust the input preset drive voltage to the number of light-emitting regions in the lamp group coupled to the first driver circuit and the preset number, so that the voltage regulating circuit outputs the drive voltage Vgs' of the driver transistor < the preset drive voltage Vgs. Accordingly, the total drive current of the first lamp group is less than the total drive current corresponding to the preset drive voltage Vgs.Compared with the case where the preset driving voltage Vgs is used to drive the driving transistor to turn on the first lamp group to emit light, the light emission brightness of each lamp in the first lamp group can be reduced, thereby avoiding a relatively large difference in the brightness of the lamps in the first lamp group and the second lamp group and avoiding deterioration of the brightness uniformity of the backlight module.

[0107] Obviously, in a specific implementation, the number of light-emitting regions comprised by the first lamp group may be greater than the number of light-emitting regions comprised by the second lamp group. When the first lamp group is coupled to the first driver circuit, the voltage regulation circuit may adjust the input preset drive voltage to the number of light-emitting regions in the lamp group coupled to the first driver circuit and the preset number, such that the voltage regulation circuit outputs the drive voltage Vgs' of the driver transistor > the preset drive voltage Vgs. Accordingly, the total drive current of the first lamp group is greater than the total drive current corresponding to the preset drive voltage Vgs.Compared with the case where the preset driving voltage Vgs is used to drive the driving transistor to turn on the first lamp group to emit light, the light emission brightness of each lamp in the first lamp group can be increased, thereby avoiding a relatively large difference in the brightness of the lamps in the first lamp group and the second lamp group and avoiding deterioration of the brightness uniformity of the backlight module.

[0108] In a special implementation, as in Fig. 1, the backlight module 7 has a shape similar to a rectangle with truncated corners, that is, a shape in which the right angle portions of the rectangle are truncated. In a specific implementation, when the backlight module is applied to a virtual reality (VR) display, for example, when applied to VR glasses, the VR glasses include two display screens, each of which includes the backlight module provided in the embodiment of the present disclosure. The shape of the backlight module corresponds to the shape of the display screen, that is, the entire display screen also has a shape similar to a rectangle with truncated corners, which can reduce the interpupillary distance between the two display screens.Furthermore, with VR headsets, the distance between the user's eyes and the screen is very small during use, so the edges of the screen are unnoticeable. Therefore, trimming the corners does not affect the viewing angle and can even reduce the weight of the headset.

[0109] It should be noted that in Fig. 1 not all lamp groups are shown. In Fig. 1, the example used is that the second lamp group includes eight light-emitting regions, that is, the preset number of light-emitting regions is eight, and the first lamp group includes four or six light-emitting regions. Obviously, the number of lamp groups, the number of preset light-emitting regions, and the number of light-emitting regions in the plurality of first lamp groups can be adjusted according to the actual size, shape, and other requirements of the backlight module.

[0110] It should be noted that the second group of lamps in Fig. 10 is not shown. In Fig. Figure 10 illustrates an example in which the first driver circuit includes a voltage regulator circuit and a driver transistor. In a specific implementation, the first driver circuit may also include a pulse modulation circuit, a voltage stabilization circuit, a feedback circuit, an operational amplifier circuit, a fifth resistor, and the like.

[0111] When the driver circuit 1 (ie the first driver circuit) as shown in Fig. 11, comprises an operational amplifier circuit and a fifth resistor R5, in some embodiments, multiple driver circuits 1 (ie, the first driver circuits) may share the operational amplifier circuit and the fifth resistor R5.

[0112] In some embodiments, as in Fig. 11, several second lighting groups 9 are each coupled to different driver circuits 1 (ie first driver circuits).

[0113] That is, in the backlight module provided by the embodiment of the present disclosure, each lamp group is coupled one-to-one with the above-mentioned drive circuit provided by the embodiment of the present disclosure. Therefore, the design and manufacturing difficulties of the drive circuit for the backlight module can be simplified.

[0114] Of course, in a specific implementation, the driver circuit connected to the plurality of second light source groups may not be coupled to the driver circuit provided in the embodiment of the present disclosure. In some embodiments, as in Fig. 12, the backlight module further includes a plurality of second driver circuits 33. Of the plurality of lamp groups, only the first lamp group is coupled to the first driver circuit, and the second lamp group is coupled to the second driver circuit. As shown in Fig. 12, the second driving circuit 33 includes, for example, a driving transistor 2, a pulse modulation circuit 10, a voltage stabilizing circuit 11, a feedback circuit 12, an operational amplifier circuit, and a fifth resistor R5. The connection relationship among the driving transistor, the pulse modulation circuit, the voltage stabilizing circuit, the feedback circuit, the operational amplifier circuit, and the fifth resistor included in the second driving circuit is the same as the connection relationship between the above circuits in the first driving circuit. The specific composition of the pulse modulation circuit, the voltage stabilizing circuit, the feedback circuit, and the operational amplifier circuit included in the second driving circuit is the same as the specific composition of the above circuits in the first driving circuit and will not be repeated here.When the driver circuit 1 (ie, the first driver circuit) and the second driver circuit 33 are connected as shown in . Fig. 12, both include an operational amplifier circuit and a fifth resistor R5, a plurality of driver circuits 1 (ie, the first driver circuit) and a plurality of second driver circuits 33 may share the operational amplifier circuit and the fifth resistor R5.

[0115] In a special implementation, as in Fig. 10 and Fig. As shown in Figure 11, the drain of the driver transistor is coupled to the cathode of the lamp, the anode of the lamp is coupled to the anode voltage signal terminal PVDD, and the anode voltage signal terminal PVDD provides an anode voltage signal to the anode of the lamp. In a specific implementation, the light-emitting regions 5 are arranged in an array along the first direction Y and the second direction X. The first direction Y intersects the second direction X. In Fig. 10 and Fig. 11, for illustrative purposes, an example is assumed that the first direction Y is perpendicular to the second direction X. The anodes of the light-emitting devices in a row of light-emitting regions 5 arranged along the second direction X are coupled to the same anode signal line 18. In particular, the anode signal line can also be coupled to the anode voltage signal terminal PVDD via a data selector (MUX), i.e., it is controlled via a MUX whether a row of light-emitting regions inputs an anode voltage signal, wherein the number of MUXs corresponds to the number of preset light-emitting regions. In Fig. 10 and Fig. 11 shows an example in which each light-emitting region 5 comprises a light-emitting means 6. In a specific implementation, each light-emitting region may further comprise a plurality of light-emitting means arranged along the first direction Y.

[0116] In a specific implementation, the backlight module provided in the embodiment of the present disclosure can be controlled to enable two lighting modes: a constant light mode and a black insertion mode. The constant light mode means that the lamps in each lamp group are always lit. The black insertion mode is controlled by timing control. Taking the example of coupling a row of light-emitting regions to a MUX, only one MUX is turned on at any time, and the lamps in the row of light-emitting regions corresponding to the turned-on MUX are lit, and the cycle is repeated, utilizing the human visual persistence effect to display the entire backlight, thereby achieving a low-power display.

[0117] In some embodiments, the light-emitting device is a micro-sized inorganic light-emitting diode. The micro-sized inorganic light-emitting diode may, for example, be a mini light-emitting diode (mini-LED) or a micro light-emitting diode (micro-LED).

[0118] A driving method for a backlight module provided by an embodiment of the present disclosure as described in Fig. 13, includes: S101, driving a driver circuit coupled to a first lamp group to input a preset drive voltage; S102, driving a voltage control circuit to output the driving voltage of the driving transistor according to the preset driving voltage, the number of light-emitting regions and the preset number, so that the driving transistor is driven to turn on to drive the lamps in the first lamp group to emit light.

[0119] The embodiment of the present disclosure provides a driving method for a backlight module that uses a voltage regulating circuit to adapt an input preset driving voltage to the number of light-emitting regions in a first lamp group and a preset number, so that the driving voltage Vgs' of the driving transistor output from the voltage regulating circuit is not equal to the preset driving voltage Vgs and the total driving current of the first lamp group is not equal to the total driving current corresponding to the preset driving voltage Vgs.Compared with the case where the preset driving voltage Vgs is used to drive the driving transistor to turn on so that the first lamp group is driven to emit light, the light emission brightness of each lamp in the first lamp group can be increased or decreased, thereby avoiding a relatively large difference in the brightness of the lamps in the first lamp group and the second lamp group and avoiding deterioration of the brightness uniformity of the backlight module.

[0120] In some embodiments, the voltage regulation circuit comprises a first pulse modulation switch which, when a driver circuit coupled to the first group of lamps is driven to input a preset driver voltage, is also driven to switch on in order to apply a preset driver voltage to the first input terminal of the voltage regulation circuit via the first pulse modulation switch.

[0121] In some embodiments, the driver circuit further comprises a second pulse modulation switch and a third pulse modulation switch, which, when the first pulse modulation switch is driven to turn on, are also driven to turn off the second pulse modulation switch and the third pulse modulation switch.

[0122] In some embodiments, the plurality of second light source groups are each coupled to different driver circuits, and the method further comprises: Driving the first pulse modulation switch of a driver circuit coupled to the first lamp group to turn off, and driving the second pulse modulation switch to turn on; driving the driver transistor to turn on, thereby driving the lamps in the second lamp group to emit light.

[0123] In some embodiments, it also includes: Controlling the first pulse modulation switch to turn off, and controlling the second pulse modulation switch and the third pulse modulation switch to turn on.

[0124] In some embodiments, when driving the driver transistor to turn on to drive the lamps in the first lamp group to emit light, or when driving the driver transistor to turn on to drive the lamps in the second lamp group to emit light, an anode voltage signal is further supplied to the anode of the lamp via the anode voltage signal terminal.

[0125] Based on the same inventive concept, the embodiment of the present disclosure also provides a display device as shown in Fig. 14 includes the following: a backlight module provided according to an embodiment of the present disclosure; a display panel located on the light-emitting side of the backlight module.

[0126] In some embodiments, the display panel is a liquid crystal display panel. As in Fig. 15, the liquid crystal display panel comprises: an array substrate 15 and a counter substrate 16 arranged opposite each other, and a liquid crystal layer 17 located between the array substrate 15 and the counter substrate 16.

[0127] In some embodiments, as in Fig.15, the array substrate 15 includes a first base substrate 20, a buffer layer 21, an active layer 19 of the thin film transistor TFT, a gate insulating layer 22, a gate G of the thin film transistor TFT, an interlayer insulating layer 23, a source S and a drain D of the thin film transistor TFT, a planarization layer 24, a common electrode 25, a passivation layer 26, a pixel electrode 27, and a protective layer 28, which are sequentially arranged on the side of the first base substrate 20 facing the liquid crystal layer 17. The counter substrate 16 comprises: a second base substrate 29, a color resist 30 located on the side of the second base substrate 29 facing the liquid crystal layer 17, and a black matrix 31. The black matrix 31 includes a plurality of opening regions 32, wherein the color resist 30 is located in the opening regions 32.

[0128] The display device provided in the embodiments of the present disclosure is any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a laptop computer, a digital photo frame, and a navigator. Other essential components of the display device should be understandable to those skilled in the art and are not redundantly described here and should not be construed as limiting the present disclosure. The implementation of the display device may refer to the above-mentioned embodiments of the driver circuit and the backlight module, and the repeated parts are not redundantly described.

[0129] In summary, the driving circuit, the backlight module and its driving method, as well as the display device and a driving circuit provided by the embodiments of the present disclosure include a voltage regulation circuit. The voltage regulation circuit can adjust the input preset driving voltage according to the number of light-emitting regions in the lamp group coupled to the driving circuit and the preset number, so that the driving voltage Vgs' of the driving transistor output by the voltage regulation circuit is not equal to the preset driving voltage Vgs. Accordingly, the total driving current of the lamp group is not equal to the total driving current corresponding to the preset driving voltage Vgs.Compared with the case where the preset driving voltage Vgs is used to drive the driving transistor to turn on so as to drive the lamp group to emit light, the light emission brightness of each lamp in the lamp group can be increased or decreased, thereby avoiding relatively large brightness differences between different areas of the backlight module and thus avoiding the deterioration of the brightness uniformity of the backlight module.

[0130] Although preferred embodiments of the present invention have been described, additional variations and modifications may be made to these embodiments once those skilled in the art are familiar with the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted to encompass the preferred embodiment and all variations and modifications that fall within the scope of the present invention.

[0131] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Therefore, to the extent that these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to encompass these modifications and variations.

Claims

[1] Driver circuit, the driver circuit comprising a driver transistor and a voltage regulator circuit; wherein the source of the driver transistor is coupled to the first voltage signal terminal, the drain of the driver transistor is used for coupling to the light source group, and the gate of the driver transistor is coupled to the output terminal of the voltage regulation circuit; wherein the light source group comprises a plurality of light-emitting regions arranged along the first direction, and wherein the light-emitting region comprises at least one light source, wherein the number of light-emitting regions comprised by the light source group is less than, equal to, or greater than a preset number; wherein the first input terminal of the voltage regulation circuit is coupled to the second voltage signal terminal; wherein the voltage of the second voltage signal terminal is a preset drive voltage Vgs of the drive transistor; wherein the voltage control circuit is for, when the number of light-emitting regions comprised by the lamp group is not equal to the preset number, to output the driving voltage Vgs' of the driving transistor in accordance with the input preset driving voltage, the number of light-emitting regions comprised by the lamp group and the preset number; where Vgs' is not equal to Vgs. [2] A driver circuit according to claim 1, wherein the drive voltage Vgs' of the driver transistor and the preset drive voltage Vgs are: Vgs'=mn(Vgs−Vth)+Vth; where m is the number of light-emitting regions comprised by the lamp group, n is the preset number, and Vth is the threshold voltage of the driver transistor. [3] The driver circuit of claim 2, wherein the voltage regulation circuit comprises a first operational amplifier and a second operational amplifier; wherein the non-inverting input terminal of the first operational amplifier is coupled to the second voltage signal terminal, the inverting input terminal of the first operational amplifier is coupled to the positive electrode of the fixed voltage source, the inverting input terminal of the second operational amplifier, and the output terminal of the second operational amplifier, and the output terminal of the first operational amplifier is coupled to the inverting input terminal of the second operational amplifier; wherein the negative electrode of the fixed voltage source is grounded, and the voltage of the fixed voltage source is the threshold voltage Vth of the driver transistor; where the gain of the first operational amplifier mn amounts; wherein a non-inverting input terminal of the second operational amplifier is grounded, and an output terminal of the second operational amplifier is coupled to a gate of the driver transistor. [4] The driver circuit of claim 3, wherein the voltage regulating circuit further comprises a first resistor, a second resistor, a third resistor, and a fourth resistor; wherein a first terminal of the first resistor is coupled to an output terminal of the first operational amplifier, and a second terminal of the first resistor is coupled to an inverting input terminal of the second operational amplifier; wherein a first terminal of the second resistor is coupled to the inverting input terminal of the first operational amplifier, and a second terminal of the second resistor is coupled to the inverting input terminal of the second operational amplifier; wherein a first terminal of the third resistor is coupled to the output terminal of the second operational amplifier, and a second terminal of the third resistor is coupled to the inverting input terminal of the second operational amplifier; wherein a first terminal of the fourth resistor is grounded, and a second terminal of the fourth resistor is coupled to a non-inverting input terminal of the second operational amplifier; where the resistance values ​​of the first resistor, the second resistor, the third resistor and the fourth resistor are all the same. [5] The driver circuit of claim 4, wherein the voltage regulation circuit further comprises a filter capacitor; wherein a first electrode of the filter capacitor is coupled to the positive electrode of the fixed voltage source and the first terminal of the second resistor, wherein a second electrode of the filter capacitor is grounded. [6] The driver circuit of any one of claims 3 to 5, wherein the voltage regulation circuit further comprises a first pulse modulation switch; wherein a first terminal of the first pulse modulation switch is coupled to the second voltage signal terminal, and a second terminal of the first pulse modulation switch is coupled to the non-inverting input terminal of the first operational amplifier. [7] The driver circuit according to any one of claims 1 to 6, wherein the driver circuit further comprises a pulse modulation circuit connected in parallel to the first input terminal and the output terminal of the voltage regulating circuit. [8] The driver circuit of claim 7, wherein the pulse modulation circuit comprises a second pulse modulation switch and a third pulse modulation switch; wherein the first terminal of the second pulse modulation switch is coupled to the second voltage signal terminal, wherein the second terminal of the second pulse modulation switch is coupled to the first terminal of the third pulse modulation switch and the gate of the driver transistor; wherein the second terminal of the third pulse modulation switch is grounded. [9] The driver circuit according to claim 7 or 8, wherein the driver circuit further comprises a voltage stabilizing circuit; wherein the voltage stabilizing circuit comprises a third operational amplifier and a fourth operational amplifier; wherein the non-inverting input terminal of the third operational amplifier is coupled to the second voltage signal terminal, wherein the inverting input terminal of the third operational amplifier is coupled to the source of the driver transistor, and the output terminal of the third operational amplifier is coupled to the non-inverting input terminal of the fourth operational amplifier; wherein the inverting input terminal of the fourth operational amplifier is coupled to the output terminal of the fourth operational amplifier, and the output terminal of the fourth operational amplifier is coupled to the first input terminal of the voltage regulation circuit. [10] The driver circuit of claim 9, wherein the driver circuit further comprises: an operational amplifier circuit and a fifth resistor; wherein a first input terminal of the operational amplifier circuit is coupled to the second voltage signal terminal, wherein a second input terminal of the operational amplifier circuit is coupled to the current multiplier adjustment signal terminal, a third input terminal of the operational amplifier circuit is coupled to the first terminal of the fifth resistor, and an output terminal of the operational amplifier circuit is coupled to the non-inverting input terminal of the third operational amplifier; wherein a second terminal of the fifth resistor is grounded. [11] The driver circuit of any one of claims 1 to 10, wherein the driver circuit further comprises a feedback circuit; wherein the feedback circuit comprises a feedback resistor; wherein the first terminal of the feedback resistor is coupled to the source of the driver transistor, and the second terminal of the feedback resistor is coupled to the first voltage signal terminal; wherein the first voltage signal terminal is a ground potential signal terminal. [12] A driver circuit according to any one of claims 1 to 11, wherein the driver transistor is an N-type metal oxide semiconductor field effect transistor. [13] A backlight module, the backlight module comprising: a plurality of light source groups and a plurality of first driving circuits; wherein the first driving circuit is the driving circuit according to any one of claims 1 to 12; wherein the luminous element group comprises a plurality of light-emitting regions arranged along a first direction, the light-emitting region comprising at least one luminous element; wherein the plurality of light source groups comprises a plurality of first light source groups and a plurality of second light source groups; wherein the number of light-emitting regions comprised by the second light source group is equal to a preset number, and the number of light-emitting regions comprised by the first light source group is smaller than the number of light-emitting regions comprised by the second light source group; wherein the plurality of first light source groups are each coupled to the different first driver circuits. [14] The backlight module of claim 13, wherein the plurality of second light source groups are each coupled to the different first driver circuits. [15] The backlight module of claim 13, wherein the backlight module further comprises a plurality of second driver circuits; wherein the plurality of second light source groups are each coupled to different second driver circuits; wherein the second driver circuit comprises a driver transistor, a pulse modulation circuit, a voltage stabilization circuit, a feedback circuit, an operational amplifier circuit, and a fifth resistor. [16] A driving method for a backlight module according to any one of claims 13 to 15, the method comprising: Driving a driver circuit coupled to the first group of lamps to input a preset driver voltage; Driving the voltage control circuit to output a driving voltage of the driving transistor according to the preset driving voltage, the number of light-emitting regions, and the preset number to drive the driving transistor to turn on, so that the lamps in the first lamp group are driven to emit light. [17] The method of claim 16, wherein the voltage regulation circuit comprises a first pulse modulation switch which, when a driver circuit coupled to the first lamp group is driven to input a preset drive voltage, is also driven to turn on in order to apply the preset drive voltage to the first input terminal of the voltage regulation circuit via the first pulse modulation switch. [18] The method of claim 17, wherein the driver circuit further comprises a second pulse modulation switch and a third pulse modulation switch, which, when the first pulse modulation switch is driven to turn on, are also driven to turn off the second pulse modulation switch and the third pulse modulation switch. [19] The method of claim 18, wherein the plurality of second light source groups are each coupled to the different driver circuits, and the method further comprises: Driving the first pulse modulation switch of a driver circuit coupled to the first lamp group to turn off, and driving the second pulse modulation switch to turn on; driving the driver transistor to turn on, thereby driving the lamps in the second lamp group to emit light. [20] Display device comprising: the backlight module according to claim 14 or 15; a display panel located on the light-emitting side of the backlight module.

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