Backlight driver, backlight unit, backlight controller, and display device

Abstract

The embodiment of the invention provides a backlight driver, a backlight unit, a backlight controller and a display device. When an initial dimming signal and a phase shift signal of the initial dimming signal are received, the initial dimming signal is decoded; the dimming signal of the current backlight driver and dimming signals of other backlight drivers behind the current backlight driver are obtained, phase shift processing is carried out on the dimming signals of the other backlight drivers, and the dimming signals of the other backlight drivers and phase shift signals of the dimming signals of the other backlight drivers are output; therefore, the electromagnetic interference can be reduced in the dimming signal transmission process. And only the initial dimming signal needs to be decoded, and the phase shift signal does not need to be processed, so that a special transceiver is not needed, the size of the backlight driver is prevented from being increased or the function of the backlight driver is prevented from being complicated, and the development cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and in particular, to a backlight driver, a backlight unit, a backlight controller, and a display device. Background Art

[0002] With the improvement of people's living quality and diverse demands, Mini-LED (Mini Light Emitting Diode) display devices are gradually becoming larger and more high-performance. Therefore, the number of light sources and backlight drivers in the display device is increasing, and the required data transmission rate increases, resulting in an increase in electromagnetic interference (EMI).

[0003] Currently, the dimming signal can be transmitted in the form of a differential signal, and the signal receiving end determines the dimming signal by comparing the voltage difference of the differential signal, effectively reducing noise and interference.

[0004] However, the applicant has found that the differential signal requires a dedicated transceiver, and the size of this transceiver is relatively large, which is not suitable for a backlight driver with a small size. Summary of the Invention

[0005] Embodiments of the present application provide a backlight driver, a backlight unit, a backlight controller, and a display device to reduce electromagnetic interference.

[0006] In a first aspect, an embodiment of the present application provides a backlight driver, which is used for

[0007] When receiving an initial dimming signal and a phase-shifted signal of the initial dimming signal, decoding the initial dimming signal to obtain a dimming signal of the current backlight driver and dimming signals of other backlight drivers after the current backlight driver;

[0008] Performing a phase-shifting process on the dimming signals of the other backlight drivers to obtain phase-shifted signals of the dimming signals of the other backlight drivers;

[0009] Outputting the dimming signals of the other backlight drivers and the phase-shifted signals of the dimming signals of the other backlight drivers.

[0010] In a possible implementation manner, the other backlight drivers include: each backlight driver arranged after the current backlight driver in the same column of the backlight unit.

[0011] In a possible implementation manner, a phase-shifting unit is provided in the backlight driver;

[0012] The phase shift unit is used to perform phase shift processing on the dimming signal of the other backlight driver to obtain a phase shift signal of the dimming signal of the other backlight driver.

[0013] In a possible implementation manner, the phase shift unit includes an inverter.

[0014] In a possible implementation, the backlight driver includes two input pins and two output pins;

[0015] The two input pins are used to receive the initial dimming signal and the phase shift signal of the initial dimming signal respectively;

[0016] The two output pins are used to output the dimming signal of the other backlight driver and the phase shift signal of the dimming signal of the other backlight driver respectively.

[0017] In a second aspect, the present application provides a backlight unit, including the first aspect and / or various possible implementations of the first aspect.

[0018] In a possible implementation manner, there are multiple backlight drivers, and the multiple backlight drivers are cascade-connected;

[0019] A first signal line and a second signal line are connected between adjacent backlight drivers;

[0020] The first signal line is used to transmit the dimming signal of the other backlight driver, and the second signal line is used to transmit the phase shift signal of the dimming signal of the other backlight driver.

[0021] In a third aspect, the present application provides a backlight controller, wherein the backlight controller is used to:

[0022] After receiving the dimming signal of the backlight unit, performing phase shift processing on the dimming signal of the backlight unit to obtain a phase shift signal of the dimming signal of the backlight unit;

[0023] A dimming signal of the backlight unit and a phase shift signal of the dimming signal of the backlight unit are output to a backlight driver.

[0024] In a possible implementation manner, a phase shift unit is provided in the backlight controller;

[0025] The phase shift unit is used to perform phase shift processing on the dimming signal of the backlight unit to obtain a phase shift signal of the dimming signal of the backlight unit.

[0026] In a possible implementation, the backlight controller includes an input pin and two output pins;

[0027] The input pin is used to receive a dimming signal of the backlight unit;

[0028] The two output pins are used to output the dimming signal of the backlight unit and the phase shift signal of the dimming signal of the backlight unit respectively.

[0029] In a fourth aspect, the present application provides a display device, including the first aspect and / or various possible implementations of the first aspect, and the second aspect and / or various possible implementations of the second aspect.

[0030] The backlight driver, backlight unit, backlight controller and display device provided in the embodiment of the present application, after receiving the initial dimming signal and the phase shift signal of the initial dimming signal, decode the initial dimming signal to obtain the dimming signal of the current backlight driver and the dimming signals of other backlight drivers after the current backlight driver, and perform phase shift processing on the dimming signals of other backlight drivers, and output the dimming signals of other backlight drivers and the phase shift signals of the dimming signals of other backlight drivers, so as to reduce electromagnetic interference during the transmission of the dimming signal. And since only the initial dimming signal needs to be decoded and the phase shift signal does not need to be processed, a dedicated transceiver is not required, which prevents the size of the backlight driver from increasing or the function from becoming complicated, and reduces the development cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] Figure 1 is a structural schematic diagram of a display device;

[0033] Figure 2 It is a partial structural schematic diagram of a display device;

[0034] Figure 3 A schematic diagram of the working process of a backlight driver provided in one embodiment of the present application;

[0035] Figure 4 A schematic diagram of the operation of a backlight driver provided in one embodiment of the present application;

[0036] Figure 5 A schematic diagram of cascading multiple backlight drivers provided in one embodiment of the present application;

[0037] Figure 6 A schematic diagram of the working process of a backlight controller provided in one embodiment of the present application.

[0038] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0039] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0040] Figure 1 A schematic diagram of the structure of a display device is shown. Figure 1 As shown, the display device includes a timing controller (TCON) 400, a backlight controller 300, a backlight unit 100 (BLU) and a liquid crystal display panel 200. The backlight unit 100 may include a plurality of backlight drivers 10 arranged in an array, and a plurality of light sources 30 connected to each backlight driver 10, and the light source 30 may be, for example, a light emitting diode (LED).

[0041] The timing controller 400 is used to generate display data (Display Data) and local dimming data (Local Dimming Data) according to the video data output by the video source (such as a graphics card, a video processor), and send the display data to the liquid crystal display panel 200, and send the local dimming data to the backlight controller 300. The backlight controller 300 is used to send the local dimming data of each backlight area to the corresponding backlight driver 10. The backlight driver 10 provides a backlight driving signal to the light source 30, and the backlight driving signal can control the luminous brightness of the light source 30, thereby providing backlights of different brightness. The liquid crystal display panel 200 displays an image based on the display data.

[0042] When the number of light sources in a Mini-LED display device is small, less data needs to be transmitted and electromagnetic interference can be ignored.

[0043] However, with the improvement of people's quality of life and diversified needs, Mini-LED display devices are gradually becoming larger and more high-performance. Mini-LED display devices include but are not limited to AM mini-LED (Active Matrix mini Light-emitting Diode) display devices. In order to support larger display sizes and resolutions, display devices require more light sources to provide uniform backlighting. In order to achieve finer local dimming, the display area needs to be divided into more dimming areas, each of which is usually controlled by one or more backlight drivers.

[0044] Therefore, the number of light sources 30 and backlight drivers 10 in a backlight unit increases. Figure 2 As shown, the required data transmission rate increases, resulting in increased electromagnetic interference.

[0045] In some examples, in order to reduce electromagnetic interference, the dimming signal can be transmitted in the form of a differential signal. Differential signaling is a signal transmission technology whose main function is to improve the anti-interference ability of signal transmission and effectively reduce noise and interference. Differential signaling realizes signal transmission by transmitting signals with the same amplitude and opposite phase on two lines. The signal receiving end determines the logical state of the sending end by comparing the voltage difference between the two lines. For example, the dimming signal can be converted into two mutually anti-phase signals through a differential driver to reduce electromagnetic interference during signal transmission.

[0046] However, the applicant has found that a differential signal requires a dedicated transceiver, and such a transceiver is relatively large and is not suitable for a backlight driver of a relatively small size.

[0047] The backlight driver provided by the present application, after receiving the initial dimming signal and the phase shift signal of the initial dimming signal, decodes the initial dimming signal to obtain the dimming signal of the current backlight driver and the dimming signals of other backlight drivers after the current backlight driver, performs phase shift processing on the dimming signals of other backlight drivers, and outputs the dimming signals of other backlight drivers and the phase shift signals of the dimming signals of other backlight drivers, thereby reducing electromagnetic interference during the transmission of the dimming signal. And since only the initial dimming signal needs to be decoded and the phase shift signal does not need to be processed, a dedicated transceiver is not required, which prevents the size of the backlight driver from increasing or the function from becoming complicated, and reduces the development cost.

[0048] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0049] An embodiment of the present application provides a backlight driver. The backlight driver provided in the embodiment of the present application is used to perform Figure 3 The control method shown comprises:

[0050] S101, when an initial dimming signal and a phase shift signal of the initial dimming signal are received, the initial dimming signal is decoded to obtain a dimming signal of a current backlight driver and dimming signals of other backlight drivers after the current backlight driver;

[0051] S102, performing phase shift processing on the dimming signals of other backlight drivers to obtain phase shift signals of the dimming signals of other backlight drivers;

[0052] S103 , outputting dimming signals of other backlight drivers and phase shift signals of the dimming signals of other backlight drivers.

[0053] In the embodiment of the present application, when the backlight driver receives the initial dimming signal and the phase shift signal of the initial dimming signal, it only decodes the initial dimming signal and does not process the phase shift signal of the initial dimming signal, and does not require a dedicated transceiver, thereby preventing the size of the backlight driver from increasing or the function from becoming complicated, and reducing the development cost. In addition, since the phase shift signal of the initial dimming signal and the initial dimming signal are in opposite phases, electromagnetic interference can be reduced.

[0054] For example, the other backlight drivers include all backlight drivers arranged after the backlight driver in the same column of the backlight unit. For example, the backlight unit includes a plurality of backlight drivers arranged in an array, each column includes a plurality of backlight drivers arranged in sequence, and the other backlight drivers include each backlight driver arranged after the current backlight driver in the same column, that is, all backlight drivers after the current backlight driver.

[0055] Figure 4 A schematic diagram of the working process of a backlight driver is shown in FIG. Figure 4 As shown, the backlight driver performs phase shift processing on the dimming signal to obtain a phase shift signal of the dimming signal, and then outputs the dimming signal and the phase shift signal of the dimming signal.

[0056] It should be noted that the initial dimming signal includes the dimming signal of the current backlight driver and the dimming signals of other backlight drivers after the current backlight driver. Decoding the initial dimming signal may include identifying the dimming signal of the current backlight driver, so as to obtain the dimming signal of the current backlight driver and the dimming signals of other backlight drivers after the current backlight driver. Since the phase shift signal is not processed, the phase shift signal can be understood as a virtual signal for reducing electromagnetic interference. The dimming signal is used to control the brightness of the light source connected to the backlight driver.

[0057] Similarly, the phase shift signal of the initial dimming signal may include the phase shift signal of the dimming signal of the current backlight driver and the phase shift signals of the dimming signals of other backlight drivers.

[0058] For example, the dimming signal of the current backlight driver may carry the identifier of the current backlight driver, and the dimming signal of the current backlight driver may be searched according to the identifier of the current backlight driver.

[0059] For example, Figure 5 As shown, there are multiple backlight drivers, which are cascade-connected and are sequentially referred to as a first-stage backlight driver, a second-stage backlight driver, ..., an nth-stage backlight driver, where n is an integer greater than 1.

[0060] When the first-level backlight driver receives the initial dimming signal and the phase shift signal of the initial dimming signal, it only decodes and processes the initial dimming signal to obtain the dimming signal of the first-level backlight driver and the dimming signals of other backlight drivers after the first-level backlight driver. Accordingly, the initial dimming signal received by the first-level backlight driver includes the dimming signal of the first-level backlight driver and the dimming signals of the second-level backlight driver to the n-th-level backlight driver, that is, includes the dimming signal of the n-th-level backlight driver, and the other backlight drivers after the first-level backlight driver are the second-level backlight driver to the n-th-level backlight driver. It should be noted that each level of backlight driver has a corresponding dimming signal, and the dimming signals of the second-level backlight driver to the n-th-level backlight driver refer to the dimming signal of the second-level backlight driver, the dimming signal of the third-level backlight driver, ..., the dimming signal of the n-th-level backlight driver.

[0061] After the first-level backlight driver obtains the dimming signal of the first-level backlight driver and the dimming signal from the second-level backlight driver to the n-level backlight driver, it performs phase shift processing on the dimming signal from the second-level backlight driver to the n-level backlight driver to obtain the dimming signal from the second-level backlight driver to the n-level backlight driver, and then transmits the dimming signal from the second-level backlight driver to the n-level backlight driver and the phase shift signal of the dimming signal from the second-level backlight driver to the n-level backlight driver to the second-level backlight driver.

[0062] When the second-stage backlight driver receives the initial dimming signal and the phase shift signal of the initial dimming signal, it only decodes the initial dimming signal to obtain the dimming signal of the second-stage backlight driver and the dimming signals of other backlight drivers after the second-stage backlight driver. Accordingly, the initial dimming signal received by the second-stage backlight driver includes the dimming signal of the second-stage backlight driver and the dimming signals of the third-stage backlight driver to the n-th-stage backlight driver, and the other backlight drivers after the second-stage backlight driver are the third-stage backlight driver to the n-th-stage backlight driver.

[0063] After the second-level backlight driver obtains the dimming signal of the second-level backlight driver and the dimming signal from the third-level backlight driver to the n-level backlight driver, the second-level backlight driver performs phase shift processing on the dimming signal from the third-level backlight driver to the n-level backlight driver to obtain the phase shift signal of the dimming signal from the third-level backlight driver to the n-level backlight driver, and then transmits the dimming signal from the third-level backlight driver to the n-level backlight driver and the phase shift signal of the dimming signal from the third-level backlight driver to the n-level backlight driver to the third-level backlight driver.

[0064] By analogy, when the n-th level backlight driver receives the initial dimming signal and the phase shift signal of the initial dimming signal, it only decodes the initial dimming signal to obtain the dimming signal of the n-th level backlight driver. Since the n-th level backlight driver is the last level backlight driver and does not need to continue to transmit the dimming signal, the n-th level backlight driver does not need to perform phase shift processing. The dimming signal received by the n-th level backlight driver is also the dimming signal of the n-th level backlight driver. The n-th level backlight driver decoding the initial dimming signal can also be understood as matching the identifier of the n-th level backlight driver with the identifier carried in the received initial dimming signal to determine the accuracy of the dimming signal.

[0065] For example, the phase shift processing of the dimming signal of other backlight drivers can be performed by flipping the phase of the dimming signal of other backlight drivers by 180°, or by flipping the phase of the dimming signal of other backlight drivers by 120°, 240°, etc., which can be determined according to actual conditions.

[0066] In some embodiments, a phase shift unit is provided in the backlight driver, and the phase shift unit is used to perform phase shift processing on the dimming signals of other backlight drivers to obtain phase shift signals of the dimming signals of other backlight drivers. Since the phase shift unit is only used to perform phase shift processing on the dimming signal and does not require other complex processing, the phase shift unit does not require a complex circuit structure and does not need to occupy too much area of ​​the backlight driver, thereby preventing the size of the backlight driver from increasing and the function from becoming complicated.

[0067] For example, the phase shift unit in the first-level backlight driver is used to phase-shift the dimming signal from the first-level backlight driver to the n-level backlight driver to obtain the phase-shifted signal from the first-level backlight driver to the n-level backlight driver; the phase shift unit in the second-level backlight driver is used to phase-shift the dimming signal from the third-level backlight driver to the n-level backlight driver to obtain the dimming signal from the third-level backlight driver to the n-level backlight driver; and so on, the phase shift unit in the n-1-level backlight driver is used to phase-shift the dimming signals of the n-1-level backlight driver and the n-level backlight driver to obtain the phase-shifted signal of the dimming signals of the n-1-level backlight driver and the n-level backlight driver; the phase shift unit in the n-level backlight driver is used to phase-shift the dimming signal of the n-level backlight driver to obtain the phase-shifted signal of the dimming signal of the n-level backlight driver.

[0068] As a way to achieve this, Figure 4 As shown, the phase shift unit may include an inverter 1011 to avoid occupying too much area of ​​the backlight driver. In other implementations, the phase shift unit may also include other circuits, devices, etc. that can achieve phase shift.

[0069] In some embodiments, the backlight driver includes two input pins and two output pins, the two input pins are respectively used to receive an initial dimming signal and a phase shift signal of the initial dimming signal, and the two output pins are respectively used to output a dimming signal of other backlight drivers and a phase shift signal of the dimming signal of other backlight drivers.

[0070] It should be noted that in the backlight driver, the input pin for receiving the phase shift signal of the initial dimming signal, and the output pin for outputting the phase shift signal of the dimming signal of other backlight drivers, may not affect other functions of the backlight driver itself, or may be given other functions, such as sending and receiving other signals.

[0071] For example, the first input pin of the first-level backlight driver receives the dimming signal from the first-level backlight driver to the n-level backlight driver, and the second input pin of the first-level backlight driver receives the phase shift signal of the dimming signal from the first-level backlight driver to the n-level backlight driver; the first output pin of the first-level backlight driver outputs the dimming signal from the second-level backlight driver to the n-level backlight driver, and the second output pin of the first-level backlight driver outputs the phase shift signal of the dimming signal from the second-level backlight driver to the n-level backlight driver.

[0072] The first input pin of the second-level backlight driver receives the dimming signal from the second-level backlight driver to the n-level backlight driver, and the second input pin of the second-level backlight driver receives the phase shift signal of the dimming signal from the second-level backlight driver to the n-level backlight driver; the first output pin of the second-level backlight driver outputs the dimming signal from the third-level backlight driver to the n-level backlight driver, and the second output pin of the second-level backlight driver outputs the phase shift signal of the dimming signal from the third-level backlight driver to the n-level backlight driver.

[0073] By analogy, the first input pin of the n-th backlight driver receives the dimming signal of the n-th backlight driver, and the second input pin of the n-th backlight driver receives the phase shift signal of the dimming signal of the n-th backlight driver. Since the n-th backlight driver does not need to continue to transmit the dimming signal backward, the n-th backlight driver may not include the first output pin and the second output pin. In order to ensure the consistency of the backlight driver, the n-th backlight driver may also include the first output pin and the second output pin, which can be left unused.

[0074] The embodiment of the present application provides a backlight driver. When the backlight driver receives an initial dimming signal and a phase shift signal of the initial dimming signal, it only decodes the initial dimming signal and does not process the phase shift signal of the initial dimming signal. No dedicated transceiver is required, which prevents the size of the backlight driver from increasing or the function from becoming complicated, and reduces the development cost. Furthermore, since the phase shift signal of the initial dimming signal and the initial dimming signal are in opposite phases, electromagnetic interference can be reduced.

[0075] An embodiment of the present application further provides a backlight unit. The backlight unit provided by the embodiment of the present application includes the above-mentioned backlight driver.

[0076] In some embodiments, there are multiple backlight drivers, and the multiple backlight drivers are connected in cascade, that is, the backlight driver includes multiple cascade-connected backlight drivers. A first signal line and a second signal line are connected between adjacent backlight drivers, the first signal line is used to transmit the dimming signal of other backlight drivers, and the second signal line is used to transmit the phase shift signal of the dimming signal of other backlight drivers, to ensure that during the transmission of the dimming signal, electromagnetic interference can be reduced by the phase shift signal of the dimming signal.

[0077] Exemplarily, the backlight unit includes n cascaded backlight drivers, which are respectively called the first-stage backlight driver, the second-stage backlight driver, the third-stage backlight driver, …, the (n - 1)-th stage backlight driver, and the n-th stage backlight driver. A first signal line and a second signal line are connected between the first-stage backlight driver and the second-stage backlight driver, a first signal line and a second signal line are connected between the second-stage backlight driver and the third-stage backlight driver, and so on, a first signal line and a second signal line are connected between the (n - 1)-th stage backlight driver and the n-th stage backlight driver.

[0078] The first-stage backlight driver sends the dimming signals of the second-stage backlight driver to the n-th stage backlight driver to the second-stage backlight driver through the first signal line between the first-stage backlight driver and the second-stage backlight driver, and sends the phase-shifted signal of the dimming signals of the second-stage backlight driver to the n-th stage backlight driver to the second-stage backlight driver through the second signal line between the first-stage backlight driver and the second-stage backlight driver.

[0079] The second-stage backlight driver sends the dimming signals of the third-stage backlight driver to the n-th stage backlight driver to the third-stage backlight driver through the first signal line between the second-stage backlight driver and the third-stage backlight driver, and sends the phase-shifted signal of the dimming signals of the third-stage backlight driver to the n-th stage backlight driver to the third-stage backlight driver through the second signal line between the second-stage backlight driver and the third-stage backlight driver.

[0080] And so on, the (n - 1)-th stage backlight driver sends the dimming signal of the n-th stage backlight driver to the n-th stage backlight driver through the first signal line between the (n - 1)-th stage backlight driver and the n-th stage backlight driver, and sends the phase-shifted signal of the dimming signal of the n-th stage backlight driver to the n-th stage backlight driver through the second signal line between the (n - 1)-th stage backlight driver and the n-th stage backlight driver.

[0081] The backlight unit provided by the present application includes a backlight driver, which can reduce electromagnetic interference while preventing the size of the backlight driver from increasing and reducing costs.

[0082] An embodiment of the present application further provides a backlight controller. The backlight controller provided by the embodiment of the present application is used to execute Figure 6 the method shown in

[0083] S201. After receiving the dimming signal of the backlight unit, perform phase-shift processing on the dimming signal of the backlight unit to obtain a phase-shifted signal of the dimming signal of the backlight unit;

[0084] S202. Output the dimming signal of the backlight unit and the phase-shifted signal of the dimming signal of the backlight unit to the backlight driver.

[0085] The backlight controller provided in the embodiment of the present application, after receiving the dimming signal of the backlight unit, performs phase shift processing on the dimming signal of the backlight unit to obtain a phase shift signal of the dimming signal of the backlight unit, and then outputs the dimming signal of the backlight unit and the phase shift signal of the dimming signal of the backlight unit to the backlight driver to reduce electromagnetic interference. Moreover, only the phase shift processing of the dimming signal needs to be performed, and no other complex processing is required. Therefore, there is no need to add a complex circuit structure in the backlight controller to prevent the size of the backlight controller from increasing.

[0086] For example, the backlight unit includes a plurality of backlight drivers arranged in an array, each column of backlight drivers includes a plurality of cascaded backlight drivers, and for any column of backlight drivers, the backlight controller can transmit the dimming signal and the phase shift signal of the dimming signal of the same column of backlight drivers to the first-stage backlight driver of the column.

[0087] In some embodiments, a phase shift unit is provided in the backlight controller, and the phase shift unit is used to perform phase shift processing on the dimming signal to obtain a phase shift signal of the dimming signal.

[0088] In some embodiments, the backlight controller includes an input pin and two output pins, the input pin is used to receive a dimming signal, and the two output pins are used to output the dimming signal and a phase shift signal of the dimming signal, respectively.

[0089] It should be noted that, in the backlight controller, the output signal of the phase shift signal used to output the dimming signal may not affect other functions of the backlight controller itself, or may be given other functions, such as sending and receiving other signals.

[0090] The backlight controller provided in the embodiment of the present application reduces electromagnetic interference while preventing the size of the backlight controller from increasing, thereby reducing costs.

[0091] An embodiment of the present application further provides a display device, comprising the above-mentioned backlight unit and the above-mentioned backlight controller.

[0092] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A backlight driver, characterized in that: The backlight driver is used to: When receiving an initial dimming signal and a phase shift signal of the initial dimming signal, decoding the initial dimming signal to obtain a dimming signal of a current backlight driver and dimming signals of other backlight drivers after the current backlight driver; Performing phase shift processing on the dimming signal of the other backlight driver to obtain a phase shift signal of the dimming signal of the other backlight driver; The dimming signal of the other backlight driver and the phase shift signal of the dimming signal of the other backlight driver are output.

2. The backlight driver according to claim 1, characterized in that: The other backlight drivers include: each backlight driver arranged after the current backlight driver in the same column of the backlight unit.

3. The backlight driver according to claim 1, characterized in that: The backlight driver is provided with a phase shift unit; The phase shift unit is used to perform phase shift processing on the dimming signal of the other backlight driver to obtain a phase shift signal of the dimming signal of the other backlight driver.

4. The backlight driver according to claim 3, characterized in that: The phase shift unit includes an inverter.

5. The backlight driver according to any one of claims 1 to 4, characterized in that: The backlight driver comprises two input pins and two output pins; The two input pins are used to receive the initial dimming signal and the phase shift signal of the initial dimming signal respectively; The two output pins are used to output the dimming signal of the other backlight driver and the phase shift signal of the dimming signal of the other backlight driver respectively.

6. A backlight unit, characterized in that: The backlight driver comprises the backlight driver as claimed in any one of claims 1 to 5.

7. The backlight unit according to claim 6, characterized in that: There are multiple backlight drivers, and the multiple backlight drivers are cascade-connected; A first signal line and a second signal line are connected between adjacent backlight drivers; The first signal line is used to transmit the dimming signal of the other backlight driver, and the second signal line is used to transmit the phase shift signal of the dimming signal of the other backlight driver.

8. A backlight controller, characterized in that: The backlight controller is used to: After receiving the dimming signal of the backlight unit, performing phase shift processing on the dimming signal of the backlight unit to obtain a phase shift signal of the dimming signal of the backlight unit; The dimming signal of the backlight unit and a phase shift signal of the dimming signal of the backlight unit are output to a backlight driver.

9. The backlight controller according to claim 8, characterized in that: The backlight controller is provided with a phase shift unit; The phase shift unit is used to perform phase shift processing on the dimming signal of the backlight unit to obtain a phase shift signal of the dimming signal of the backlight unit.

10. The backlight controller according to claim 8, characterized in that: The backlight controller includes an input pin and two output pins; The input pin is used to receive a dimming signal of the backlight unit; The two output pins are used to output the dimming signal of the backlight unit and the phase shift signal of the dimming signal of the backlight unit respectively.

11. A display device, comprising the backlight unit according to claim 6 or 7, and the backlight controller according to any one of claims 8 to 10.

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