Driver circuit for display device and display device

Abstract

Driver circuit of a display device, wherein the display device comprises a plurality of pixel units arranged in rows and columns, each of the pixel units comprising a red display element, a green display element and a blue display element, wherein negative electrodes of display elements of the same color arranged in the same column are connected to each other, wherein the driver circuit of the display device comprises: a first row driver module connected to the positive electrodes of the red indicator elements, wherein the first row driver module is configured to receive a first operating voltage and supply a first sampling signal to the red indicator elements in each row; a second row driver module connected to positive electrodes of green indicator elements and positive electrodes of blue indicator elements, wherein the second row driver module is configured to receive a second operating voltage and to supply a second sampling signal to the green indicator elements in each row and the blue indicator elements in each row; a power supply module connected to the first row driver module and the second row driver module, wherein the power supply module is configured to output the first operating voltage to the first row driver module and the second operating voltage to the second row driver module.

Description

TECHNICAL AREA

[0001] The present application relates to the technical field of display technology, in particular a drive circuit of a display device and a display device. BACKGROUND

[0002] LED screens use light-emitting diodes (LEDs) as their basic light-emitting elements (pixels). The on / off state or brightness level of each pixel is controlled by a control circuit and a driver circuit, allowing the screens to display various information as needed. LED screens offer advantages such as a wide range of applications, vibrant colors, high brightness, and good stability, and are frequently used in fields such as advertising, information dissemination, and sporting events.

[0003] LED display screens typically contain red, green, and blue LEDs. These three primary color LEDs have different forward voltage drops. The forward voltage drop of red LEDs is generally lower than that of green and blue LEDs. To accommodate the operating characteristics of the three primary color LEDs, a voltage of 5 V is typically used to supply them. Since the forward voltage drop of the red LEDs is lower than that of the blue and green LEDs, a resistor is usually connected in series between the negative electrode of the red LED and the driver of the corresponding column to protect the red LEDs and the corresponding column driver, thus dissipating the voltage and heat.However, this increases unnecessary power loss and generates a large amount of heat, thereby increasing the overall temperature of the LED display screens and accelerating the aging of the components. SUMMARY

[0004] Therefore, it is necessary to provide a driver circuit for a display device and a display device that takes into account the technical problems of the prior art where a single voltage is used to supply the display elements, which leads to power losses and a temperature increase of the display device.

[0005] To achieve the aforementioned objectives, the present application provides a driver circuit for a display device. The display device comprises several pixel units arranged in a row and column configuration. Each pixel unit includes a red display element, a green display element, and a blue display element. Negative electrodes of display elements of the same color arranged in the same column are connected together. The driver circuit of the display device includes a first row driver module connected to the positive electrodes of the red display elements. The first row driver module is configured to receive a first operating voltage and supply a first sampling signal to the red display elements in each row.The display device's driver circuit includes a second line driver module connected to the positive electrodes of the green display elements and the positive electrodes of the blue display elements. This second line driver module is configured to receive a second operating voltage and supply a second sampling signal to the green display elements and the blue display elements in each line. The display device's driver circuit also includes a power supply module connected to both the first and second line driver modules. This power supply module is configured to supply the first operating voltage to the first line driver module and the second operating voltage to the second line driver module.

[0006] In one embodiment, the power supply module includes a first switching power supply unit. An input terminal of the first switching power supply unit is configured to receive an external alternating current. The first switching power supply unit is configured to output a supply voltage corresponding to the external alternating current. The power supply module includes a first voltage regulator unit. An input terminal of the first voltage regulator unit is connected to an output terminal of the first switching power supply unit. The first voltage regulator unit is configured to receive the supply voltage and output the first operating voltage corresponding to the supply voltage to the first line driver module. The power supply module includes a second voltage regulator unit. An input terminal of the second voltage regulator unit is connected to an output terminal of the first switching power supply unit.The second voltage control unit is configured to receive the supply voltage and output the second operating voltage to the second line driver module according to the supply voltage.

[0007] In one embodiment, the supply voltage is greater than the first operating voltage and the first operating voltage is less than or equal to the second operating voltage.

[0008] In one embodiment, the first voltage control unit and the second voltage control unit each include a DC / DC circuit.

[0009] In one embodiment, the power supply module includes a second switching power supply unit. A first output terminal of the second switching power supply unit is connected to an output terminal of the second line driver module. An input terminal of the second switching power supply unit is configured to receive an external AC current. The second switching power supply unit is configured to output the second operating voltage corresponding to the external AC current. The power supply module includes a third voltage regulator unit. An input terminal of the third voltage regulator unit is connected to a second output terminal of the second switching power supply unit. The third voltage regulator unit is configured to receive the second operating voltage and output the first operating voltage corresponding to the second operating voltage to the first line driver module.

[0010] In one embodiment, the third voltage control unit includes a DC / DC circuit.

[0011] In one embodiment, the first line driver module includes a plurality of first line channels configured to correspond one-to-one with a plurality of rows of pixel units. Positive electrodes of the red indicator elements in each row of pixel units are connected to the corresponding first line channels.

[0012] In one embodiment, the second line driver module includes multiple second line channels configured to correspond one-to-one to a plurality of lines of pixel units. Positive electrodes of the green and blue indicator elements in each line of pixel units are connected to the corresponding second line channels.

[0013] In one embodiment, the driver circuit of the display device further includes a column driver module connected to the negative electrodes of the display elements of the same color in each column, and a power supply module configured to receive the second operating voltage and supply a column driver signal to the display elements in each column.

[0014] The present application further provides a display device comprising the driver circuit of the display device according to one of the embodiments mentioned above.

[0015] The above driver circuit of the display device controls the red indicator elements separately via the first line driver module and supplies them with power separately by applying the first operating voltage to the first line driver module. The device controls the green and blue indicator elements via the second line driver module and supplies them with power by applying the second operating voltage to the second line driver module. By supplying power to the red indicator elements separately, the voltages at the three primary color indicator elements remain within a reasonable range, thereby reducing power loss and the temperature of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the accompanying drawings necessary for describing the embodiments or the prior art are briefly presented below. Naturally, the drawings described below relate only to some embodiments of the present application, and those skilled in the art can derive other drawings from these without inventive step. Fig. Figure 1 is a first schematic structure diagram of a driver circuit of a display device, which is provided in one embodiment. Fig. Figure 2 is a second schematic structure diagram of a driver circuit of a display device, which is provided in one embodiment. Fig. Figure 3 is a third schematic structure diagram of a driver circuit of a display device, which is provided in one embodiment. Fig. Figure 4 is a fourth schematic structure diagram of a driver circuit of a display device, which is provided in one embodiment. Fig. Figure 5 is a fifth schematic structure diagram of a driver circuit of a display device, which is provided in one embodiment.

[0017] Reference symbols: 100: first row driver module; 200: second row driver module; 300: power supply module; 400: column driver module; 301: first switching power supply unit; 302: first voltage regulator unit; 303: second voltage regulator unit; 304: second switching power supply unit; 305: third voltage regulator unit; 306: third switching power supply unit; 307: fourth switching power supply unit; 308: fifth switching power supply unit. DETAILED DESCRIPTION

[0018] For better understanding, the present application is explained in more detail with reference to the accompanying drawings. Some embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different ways and is not limited to the embodiments described here. Rather, these embodiments serve to complete and improve the present application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as they are generally understood by those skilled in the technical field of the present application. The terms used in the description of the present application serve only to describe specific embodiments and are not intended to limit the present application.

[0020] As used here, the singular forms "a," "an," and "the" also include the plural forms unless the context clearly requires otherwise. It should also be understood that terms such as "comprise / consist of" or "have" specify the presence of the indicated features, integers, steps, processes, components, parts, or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, processes, components, parts, or combinations thereof. The term "and / or" in this description includes all combinations of the listed elements.

[0021] The present application relates to a driver circuit for a display device. The display device comprises several pixel units arranged in rows and columns. Each pixel unit includes a red display element, a green display element, and a blue display element. The negative electrodes of the display elements that have the same color in the same column are connected to each other.

[0022] Each of the display elements is a light-emitting diode (LED). An LED is a solid-state semiconductor device that can convert electrical energy into visible light. The internal semiconductor chip of the LED consists of two parts. One part is a p-type semiconductor, the other is an n-type semiconductor. When the two semiconductors are connected, a PN junction is formed. When current is applied to the chip via a wire, electrons are driven into the p-type region, where they recombine with holes and release energy in the form of photons, causing the LED to light up. The red, green, and blue display elements can form a pixel unit, which serves as the display unit of the device and thus represents different colors. Furthermore, several pixel units arranged in an array form an LED display module. The approaches to controlling the LED display module mainly include static drive and scanning drive.Static drive refers to the positive electrodes of all display elements in each pixel unit being connected to the voltage input terminal of the LED display module, while the negative electrodes of all display elements are connected to an integrated column driver circuit (IC). Static drive does not require a row driver IC. Sampling driver means that the positive electrodes of all display elements in the same row of pixel units are connected in parallel and electrically connected to a row driver IC. Simultaneously, the negative electrodes of all display elements in the same column of pixel units are connected in parallel and electrically connected to a column driver IC.Since the row driver IC has a certain voltage drop, the input voltage applied to the row driver IC can be between 4.5 V and 5 V to ensure that different areas of the LED display module do not exhibit color differences due to voltage drop. However, because the positive electrodes of all display elements in the same row are connected in parallel, each display element in the same row receives the same voltage.

[0023] However, the forward voltage drop of a red indicator element is typically 1.8 V to 2.4 V, while the forward voltage drop of a green or blue indicator element is typically 2.4 V to 3.6 V. To protect the indicator elements and the column driver IC, a resistor is usually placed in series between the red indicator element and the column driver IC to distribute the voltage and heat. However, this approach increases unnecessary power loss. If the LED indicator module has a large footprint or high brightness, its power loss also increases. First, the power loss in the traces between an external power supply and the LED indicator module is amplified. Second, thicker power leads must be used, which increases the cost of the components.Therefore, the present application supplies power separately to the positive electrodes of the red indicator elements and the positive electrodes of the green and blue indicator elements in order to correct the deficiencies caused by the aforementioned single voltage input.

[0024] Furthermore, with reference to Fig. 1, the driver circuit of the display device a first line driver module 100, a second line driver module 200 and a power supply module 300.

[0025] The first line driver module 100 is connected to the positive electrodes of the red indicator elements. The first line driver module 100 is configured to receive an initial operating voltage and deliver an initial sampling signal to the red indicator elements in each line. The second line driver module 200 is connected to the positive electrodes of the green and blue indicator elements. The second line driver module 200 is configured to receive a second operating voltage and deliver a second sampling signal to the green and blue indicator elements in each line. The power supply module 300 is connected to the first line driver module 100 and the second line driver module 200. The power supply module 300 is configured to output the initial operating voltage to the first line driver module 100 and the second operating voltage to the second line driver module 200.

[0026] It goes without saying that in Fig. 1. The red indicator elements are designated R, the green indicator elements G, and the blue indicator elements B. Since the forward voltage drop of the red indicator elements is lower than that of the green and blue indicator elements, the first row driver module 100 is configured to drive the red indicator elements of each row separately, and the second row driver module 200 is configured to drive the green and blue indicator elements of each row, so that the voltage drop across each indicator element remains within a reasonable range. Therefore, the resistor connected in series with the negative electrode of each column of the red indicator elements can be removed, thus reducing the power loss and the overall temperature of the indicator device.

[0027] Specifically, the voltage supplied by power supply module 300 to the first line driver module 100 is defined as the first operating voltage VCC1. Optionally, the first operating voltage VCC1 can be between 2.8 V and 3.0 V, which is within the range of the forward voltage drop of the red indicator elements during normal operation. The voltage supplied by power supply module 300 to the second line driver module 200 is defined as the second operating voltage VCC2. Optionally, the second operating voltage VCC2 can be between 3.8 V and 4.0 V, which is also within the range of the forward voltage drop of the green and blue indicator elements during normal operation. Thus, the positive electrodes of all indicator elements receive appropriate voltages.Due to the reduction in power loss and temperature of the display device, the output brightness of each display element is approximately 10% higher than with the existing technical solution using a single voltage input.

[0028] Furthermore, since the scanning is achieved by time-separated illumination of indicator elements in different rows, when the first row driver module 100 and the second row driver module 200 receive a row driver signal, which is a periodic square wave, the first scanning signal, output by the first row driver module 100, is also a periodic signal. During each time unit, only one row of red indicator elements is driven into the on state. The second scanning signal, output by the second row driver module 200, is also a periodic signal, which drives the green and blue indicator elements of only one row to turn on in each time period. By scanning row by row and synchronously changing the driver signals for each column, a complete image can be seen on the LED display module due to the persistence of vision, as long as the scanning frequency is fast enough.

[0029] In the example above, the red indicator elements are controlled separately by the first line driver module 100. The first operating voltage is applied to the first line driver module 100 to power the red indicator elements. The green and blue indicator elements are controlled by the second line driver module 200. The second operating voltage is applied to the second line driver module 200 to power the green and blue indicator elements. By supplying power to the red indicator elements separately, the voltages across the three primary color indicator elements remain within a reasonable range, thus reducing power loss and the temperature of the display device.

[0030] In one embodiment, which relates to Fig. As referenced in section 1, the first line driver module comprises 100 multiple first line channels, which correspond one-to-one with multiple rows of pixel units. The positive electrodes of the red indicator elements in each row of pixel units are connected to the corresponding first line channels.

[0031] Referring to the in Fig. In the 4-row, 4-column display matrix shown, the positive electrodes of all red indicator elements in the same row are connected in parallel and electrically connected to a first row channel. The positive electrodes of the red indicator elements in different rows must be connected to different first row channels.

[0032] In one embodiment, the second line control module 200 comprises several second line channels that correspond one-to-one to several lines of pixel units. The positive electrodes of the green and blue display elements in each line of pixel units are connected to the corresponding second line channels.

[0033] All positive electrodes of the green and blue indicator elements in the same row are connected in parallel and electrically connected to a second line channel. The positive electrodes of the green and blue indicator elements in different rows must be connected to different second line channels.

[0034] In one embodiment, which relates to Fig. As referred to in section 1, the driver circuit of the display device further comprises a column driver module 400, which is connected to the negative electrodes of the display elements of the same color in each column and to the power supply module 300. The column driver module 400 is configured to receive the second operating voltage and supply a column driver signal to the display elements in each column.

[0035] The column driver module 400 comprises several column channels that correspond one-to-one to multiple columns of pixel units. The negative electrodes of the display elements of the same color in each column of pixel units are each connected to the corresponding column channel. When the first row driver module 100 and the second row driver module 200 receive a row driver signal to sequentially turn on the display elements of each row, the column driver module 400 receives a column driver signal and supplies a column driver signal to the corresponding display elements, corresponding to the column driver signals, to control the brightness of the respective display elements. Fig. For example, it is assumed that the periods during which the first row driver module 100 and the second row driver module 200 output high-level signals to the positive electrodes of the display elements in the first, second, third and fourth rows are the first period, the second period, the third period and the fourth period.To illuminate the red indicator element R in the second row and second column and the blue indicator element B in the fourth row and fourth column, it is only necessary to control the column control signal so that the column driver module 400 sets the red column channel of the second column to a low voltage level during the second time interval, sets the blue column channel of the fourth column to a low voltage level during the fourth time interval, and sets the remaining column channels to a high voltage level during the remaining time intervals, thus illuminating the target indicator elements. Meanwhile, the column driver module 400 can also control the brightness of the target indicator elements by adjusting the drive current and the duty cycle accordingly.

[0036] In one embodiment as in Fig. As shown in Figure 2, the power supply module comprises a first switching power supply unit 301, a first voltage regulator unit 302, and a second voltage regulator unit 303. The input terminal of the first switching power supply unit 301 is configured to receive an external AC current, and the first switching power supply unit 301 is configured to output a supply voltage corresponding to the external AC current. The input terminal of the first voltage regulator unit 302 is connected to the output terminal of the first switching power supply unit 301. The first voltage regulator unit 302 is configured to receive the supply voltage and output the first operating voltage corresponding to the supply voltage to the first line driver module 100. The input terminal of the second voltage regulator unit 303 is connected to the output terminal of the first switching power supply unit 301.The second voltage control unit 303 is configured to receive the supply voltage and output the second operating voltage to the second line driver module 200 according to the supply voltage.

[0037] It is understood that the first switching power supply unit 301 includes a first switching current through which a DC voltage is obtained after attenuation, rectification, and filtering of the external AC current, and this DC voltage is transferred to the output terminal to output the supply voltage VCC. The output terminal also feeds the magnitude of the output voltage back to the input terminal to provide a stable supply voltage. Furthermore, the first switching power supply unit 301 includes two output terminals, one of which is connected to the reference ground and the other to the first voltage regulator unit 302. The first voltage regulator unit 302 converts the input voltage VCC into the first operating voltage VCC1 and supplies power to the first line driver module 100.The other output terminal of the first switching power supply unit 301 is also connected to the second voltage control unit 303, which converts the input voltage VCC into the second operating voltage VCC2 and supplies power to the second line driver module 200.

[0038] In one embodiment, the supply voltage is greater than the first operating voltage. The first operating voltage is less than or equal to the second operating voltage.

[0039] Optionally, the supply voltage VCC can be configured to, for example, 12 V, 24 V, 36 V, or 48 V. The first operating voltage, VCC1, can range from 2.8 V to 3.0 V. The second operating voltage, VCC2, can range from 3.8 V to 4.0 V. By configuring the supply voltage VCC to a value higher than the first operating voltage, VCC1, and the second operating voltage, VCC2, to a value higher than the second operating voltage, the VCC supply voltage is applied at a higher voltage. This reduces the current and thus the size of the power lines, resulting in cost savings for the components, and the voltage drop across the lines does not affect the voltage drop across the display terminals.The first operating voltage VCC1 is less than or equal to the second operating voltage VCC2, ensuring that the forward voltage drops of the three primary color indicator elements are each within suitable ranges, thus making the voltage drops across each indicator element more reasonable.

[0040] In one embodiment, the first voltage regulator and the second voltage regulator each comprise a DC / DC converter. The DC / DC converter can convert a fixed DC voltage into an adjustable DC voltage and also exhibits voltage stabilization, current stabilization, power regulation, and DC line protection. Accordingly, the first voltage regulator can use the DC / DC converter to stably reduce the supply voltage VCC to the first operating voltage VCC1, and the second voltage regulator can also use the DC / DC converter to stably reduce the supply voltage VCC to the second operating voltage VCC2.

[0041] In one embodiment as in Fig. As shown in Figure 3, the power supply module comprises a second switching power supply unit 304 and a third voltage regulator unit 305. The first output terminal of the second switching power supply unit 304 is connected to the second line driver module 200. The input terminal of the second switching power supply unit 304 is configured to receive an external AC current. The second switching power supply unit 304 is configured to output the second operating voltage corresponding to the external AC current. The input terminal of the third voltage regulator unit 305 is connected to the second output terminal of the second switching power supply unit 304. The third voltage regulator unit 305 is configured to receive the second operating voltage and output the first operating voltage corresponding to the second operating voltage to the first line driver module 100.

[0042] It is evident that the second switching power supply unit 304 includes a second switching power supply that converts the external AC current into DC voltage for output. The second switching power supply unit 304 comprises three output terminals. The first output terminal is connected to the second line driver module 200 to use the output DC voltage as the second operating voltage VCC2 to power the second line driver module 200. The second output terminal is connected to the third voltage regulator unit 305, which converts the input second operating voltage VCC2 into the first operating voltage VCC1 and powers the first line driver module 100. The third output terminal is connected to the reference ground. The second operating voltage VCC2 is greater than or equal to the first operating voltage VCC1. Optionally, the first operating voltage VCC1 can be in the range of 2.8 V to 3.0 V.The second operating voltage VCC2 can be in the range of 3.8 V to 4.0 V. In other embodiments, the third voltage regulator includes a DC / DC circuit, and the third voltage regulator can stably step down the second operating voltage VCC2 to the first operating voltage VCC1 using the DC / DC circuit.

[0043] Due to the change in the internal structure of the power supply module, the sources of the first operating voltage VCC1 and the second operating voltage VCC2 change, but the forward voltage drops across each display element can still meet their respective line voltage drop ranges, effectively reducing unnecessary power loss, effectively reducing the temperature of the display device under the same conditions, enabling the use of thinner power cables to reduce application costs, and significantly improving the overall brightness of the device.

[0044] In one embodiment as in Fig. As shown in Figure 4, the power supply module includes a third switching power supply unit 306, which is connected to both the first line driver module 100 and the second line driver module 200. The first output terminal of the third switching power supply unit 306 supplies the first operating voltage VCC1 to the first line driver module 100. The second output terminal of the third switching power supply unit 306 supplies the second operating voltage VCC2 to the second line driver module 200. The third output terminal of the third switching power supply unit 306 is connected to the reference ground.

[0045] In one embodiment as in Fig.As shown in Figure 5, the power supply module comprises a fourth switching power supply unit 307 and a fifth switching power supply unit 308. The fourth switching power supply unit 307 is connected to the first line driver module 100. The first output terminal of the fourth switching power supply unit 307 supplies the first operating voltage VCC1 to the first line driver module 100. The second output terminal of the fourth switching power supply unit 307 is connected to the reference ground. The fifth switching power supply unit 308 is connected to the second line driver module 200. The first output terminal of the fifth switching power supply unit 308 supplies the second operating voltage VCC2 to the second line driver module 200. The second output terminal of the fifth switching power supply unit 308 is connected to the reference ground.

[0046] The present application also relates to a display device comprising the driver circuit of the display device according to one of the embodiments mentioned above. Based on the aforementioned driver circuit of the display device, the display device can significantly improve the overall brightness, effectively reduce unnecessary power losses, and lower the device temperature.

[0047] In the description of this specification, references to the terms "some embodiments," "other embodiments," "ideal embodiments," and the like mean that a particular feature, structure, material, or property described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0048] The technical features of the aforementioned embodiments can be combined in any way. To keep the description concise, not all possible combinations of the technical features in the aforementioned embodiments are described. However, as long as there are no contradictions between the combinations of these technical features, they should be considered to be within the scope described in this specification.

[0049] The embodiments described above represent only several implementations of the present application, and their descriptions are more specific and detailed, but should not be interpreted as limiting the scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements could be made without departing from the inventive concept of the present application, all of which would fall within the scope of protection of the present application. Therefore, the scope of protection of the present application should be governed by the attached claims.

Claims

[1] Driver circuit of a display device, wherein the display device comprises a plurality of pixel units arranged in rows and columns, each of the pixel units comprising a red display element, a green display element and a blue display element, wherein negative electrodes of display elements of the same color arranged in the same column are connected together, wherein the driver circuit of the display device comprises: a first row driver module connected to the positive electrodes of the red indicator elements, wherein the first row driver module is configured to receive a first operating voltage and to supply a first sampling signal to the red indicator elements in each row; a second row driver module connected to positive electrodes of green indicator elements and positive electrodes of blue indicator elements, wherein the second row driver module is configured to receive a second operating voltage and to supply a second sampling signal to the green indicator elements in each row and the blue indicator elements in each row; a power supply module connected to the first row driver module and the second row driver module, wherein the power supply module is configured to output the first operating voltage to the first row driver module and the second operating voltage to the second row driver module. [2] Driver circuit of the display device according to claim 1, wherein the power supply module comprises: a first switching power supply unit, wherein an input terminal of the first switching power supply unit is configured to receive an external alternating current, and the first switching power supply unit is configured to output a supply voltage corresponding to the external alternating current; a first voltage control unit, wherein an input terminal of the first voltage control unit is connected to an output terminal of the first switching power supply unit, the first voltage control unit being configured to receive the supply voltage and output the first operating voltage to the first line driver module according to the supply voltage; a second voltage control unit, wherein an input terminal of the second voltage control unit is connected to an output terminal of the first switching power supply unit, the second voltage control unit being configured to receive the supply voltage and output the second operating voltage to the second line driver module according to the supply voltage. [3] Driver circuit of the display device according to claim 2, wherein the supply voltage is greater than the first operating voltage and the first operating voltage is less than or equal to the second operating voltage. [4] Driver circuit of the display device according to claim 3, wherein the first voltage control unit and the second voltage control unit each comprise a DC / DC circuit. [5] Driver circuit of the display device according to claim 1, wherein the power supply module comprises: a second switching power supply unit, wherein a first output terminal of the second switching power supply unit is connected to the second line driver module, an input terminal of the second switching power supply unit is configured to receive an external alternating current, and the second switching power supply unit is configured to output the second operating voltage according to the external alternating current; a third voltage control unit, wherein an input terminal of the third voltage control unit is connected to a second output terminal of the second switching power supply unit, wherein the third voltage control unit is configured to receive the second operating voltage and output the first operating voltage to the first line driver module in accordance with the second operating voltage. [6] Driver circuit of the display device according to claim 5, wherein the third voltage control unit comprises a DC / DC circuit. [7] Driver circuit of the display device according to claim 1, wherein the first line driver module comprises: a plurality of first line channels configured to correspond one-to-one to a plurality of rows of pixel units, with positive electrodes of the red display elements in each row of pixel units connected to the corresponding first line channels. [8] Driver circuit of the display device according to claim 1, wherein the second line driver module comprises: a plurality of second line channels configured to correspond one-to-one with a plurality of rows of pixel units, with positive electrodes of the green display elements and the blue display elements in each row of pixel units connected to the corresponding second line channels. [9] Driver circuit of the display device according to any one of claims 1 to 8, wherein the driver circuit of the display device further comprises: a column driver module connected to the negative electrodes of the display elements of the same color in each column and a power supply module, configured to receive the second operating voltage and supply a column driver signal to the display elements in each column. [10] Display device comprising the driver circuit of the display device according to any one of claims 1 to 9.

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