CN117711332A

CN117711332A - Backlight driving device, driving method thereof and display device

Info

Publication number: CN117711332A
Application number: CN202410012567.4A
Authority: CN
Inventors: 程逸明; 沈灿; 沙金; 张文迪; 谢秋菊; 陈瑶; 方祥; 高超; 殷盛杰
Original assignee: BOE Technology Group Co Ltd; Chongqing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chongqing BOE Optoelectronics Technology Co Ltd
Priority date: 2024-01-03
Filing date: 2024-01-03
Publication date: 2024-03-15

Abstract

The embodiment of the disclosure provides a sky backlight driving device, a driving method thereof and a display device, wherein the backlight driving device comprises a time sequence controller and a backlight driving circuit, the time sequence controller is electrically connected with the backlight driving circuit, and the backlight driving circuit is electrically connected with a backlight plate; a timing controller configured to acquire backlight luminance data and transmit the backlight luminance data to the backlight driving circuit; the time sequence controller or the backlight driving circuit is set to obtain corresponding backlight scanning frequency according to the backlight brightness data, and the backlight brightness data corresponding to low brightness corresponds to lower backlight scanning frequency; and a backlight driving circuit configured to drive the backlight panel to emit light according to the backlight brightness data and the backlight scanning frequency. The technical scheme provided by the embodiment of the disclosure can overcome the technical problem of uneven back brightness in low brightness.

Description

Backlight driving device, driving method thereof and display device

Technical Field

The embodiment of the disclosure relates to the technical field of display, in particular to a backlight driving device, a driving method thereof and a display device.

Background

Light emitting diode (Light Emitting Diode, LED) technology has evolved for nearly thirty years from an initial solid state lighting power supply to a backlight source in the display area to an LED display screen, providing a solid foundation for its wider application. With the development of chip manufacturing and packaging technology, the backlight source adopting the micro inorganic light emitting diode with the submillimeter level or even the micrometer level is widely applied. Backlights employing micro-leds can achieve zonal Dimming (Local Dimming), as well as high dynamic range image (High Dynamic Range, HDR) display.

In practical application, the technical problem of uneven back brightness exists under the condition of low brightness.

Disclosure of Invention

The embodiment of the disclosure aims to solve the problem of providing a backlight driving device, a driving method thereof and a display device, so as to solve the technical problem of uneven backlight brightness at low brightness.

In order to solve the above technical problems, an embodiment of the present disclosure provides a backlight driving device, including a timing controller and a backlight driving circuit, where the timing controller is electrically connected to the backlight driving circuit, and the backlight driving circuit is electrically connected to a backlight board;

the time schedule controller is used for acquiring backlight brightness data and sending the backlight brightness data to the backlight driving circuit;

the time schedule controller or the backlight driving circuit is configured to obtain a corresponding backlight scanning frequency according to the backlight brightness data, and to correspond the backlight brightness data corresponding to low brightness to a lower backlight scanning frequency;

the backlight driving circuit is configured to drive the backlight panel to emit light according to the backlight brightness data and the backlight scanning frequency.

In an exemplary embodiment, the obtaining the corresponding backlight scanning frequency according to the backlight brightness data includes: acquiring the corresponding backlight scanning frequency according to the preset corresponding relation between the brightness and the frequency and the backlight brightness data; the corresponding relation between the preset brightness and the frequency comprises a plurality of preset scanning frequencies and a plurality of corresponding preset backlight brightness, wherein the value of the preset backlight brightness corresponding to the lower preset scanning frequency is smaller than that of the preset backlight brightness corresponding to the higher preset scanning frequency.

In an exemplary embodiment, the backlight brightness data includes backlight brightness values, the plurality of preset backlight brightness values includes a plurality of preset brightness values, and in a correspondence relationship between the preset brightness and frequency, each preset brightness value corresponds to one of the preset scanning frequencies;

the obtaining the corresponding backlight scanning frequency according to the preset corresponding relation between the brightness and the frequency and the backlight brightness data comprises the following steps: searching a preset brightness value corresponding to the backlight brightness value, and taking a preset scanning frequency corresponding to the searched preset brightness value as the backlight scanning frequency.

In an exemplary embodiment, the plurality of preset backlight brightnesses include a plurality of preset brightness value ranges formed by dividing the plurality of preset brightness values, and in the correspondence between the preset brightness and the frequency, each preset brightness value range corresponds to one of the preset scanning frequencies;

the searching for the preset brightness value corresponding to the backlight brightness value, and taking the preset scanning frequency corresponding to the searched preset brightness value as the backlight scanning frequency comprises the following steps: searching a value range of a preset brightness value corresponding to the backlight brightness value, and taking a preset scanning frequency corresponding to the value range of the searched preset brightness value as the backlight scanning frequency.

In an exemplary embodiment, the backlight brightness data includes backlight brightness values, and the plurality of preset backlight brightness values includes preset maximum backlight brightness values, preset minimum backlight brightness values; the plurality of preset scanning frequencies comprise preset maximum backlight scanning frequency and preset minimum backlight scanning frequency; in the corresponding relation between the preset brightness and the frequency, the preset maximum backlight brightness value corresponds to the preset maximum backlight scanning frequency, and the preset minimum backlight brightness value corresponds to the preset minimum backlight scanning frequency; the obtaining the corresponding backlight scanning frequency according to the preset corresponding relation between the brightness and the frequency and the backlight brightness data comprises the following steps:

taking the preset minimum backlight scanning frequency as the backlight scanning frequency under the condition that the backlight brightness value is smaller than or equal to the preset minimum backlight brightness value;

when the backlight brightness value is larger than or equal to the preset maximum backlight brightness value, the preset maximum backlight scanning frequency is used as the backlight scanning frequency;

and calculating the backlight scanning frequency according to the preset maximum backlight brightness value, the preset minimum backlight brightness value, the preset maximum backlight scanning frequency and the preset minimum backlight scanning frequency under the condition that the backlight brightness value is larger than the preset minimum backlight brightness value and smaller than the preset maximum backlight brightness value.

In an exemplary embodiment, in the case that the luminance value of the backlight partition is greater than the preset minimum backlight luminance value and less than the preset maximum backlight luminance value, the backlight scanning frequency is calculated according to the following formula:

wherein fbn is the backlight scanning frequency, fmin is the preset minimum backlight scanning frequency, fmax is the preset maximum backlight scanning frequency, bmax is the preset maximum backlight brightness value, and bmin is the preset minimum backlight brightness value.

In an exemplary embodiment, the backlight brightness value includes a pulse width modulation signal duty cycle, and the preset brightness value includes a preset pulse width modulation signal duty cycle.

In an exemplary embodiment, the acquiring backlight brightness data includes: the timing controller is configured to acquire the backlight luminance value from an external system.

In an exemplary embodiment, the acquiring backlight brightness data includes: the timing controller is configured to acquire image data from an external system and calculate the backlight luminance value based on the image data.

In an exemplary embodiment, the backlight plate includes a plurality of backlight partitions;

the obtaining backlight brightness data includes: the time schedule controller obtains a plurality of backlight brightness values respectively corresponding to the plurality of backlight partitions, calculates backlight brightness average values of the plurality of backlight partitions according to the plurality of backlight brightness values respectively corresponding to the plurality of backlight partitions, and takes the backlight brightness average values as the backlight brightness values;

Alternatively, the acquiring backlight brightness data includes: the timing controller obtains a plurality of backlight brightness values corresponding to the plurality of backlight partitions respectively, obtains a maximum backlight brightness value from the plurality of backlight brightness values corresponding to the plurality of backlight partitions respectively, and takes the maximum backlight brightness value as the backlight brightness value.

In an exemplary embodiment, the backlight panel includes at least one backlight partition, the backlight driving circuit includes at least one backlight driving chip electrically connected to the timing controller, and each of the backlight partitions is electrically connected to one of the backlight driving chips;

the time schedule controller is configured to acquire backlight brightness data corresponding to the at least one backlight partition, acquire corresponding backlight scanning frequency according to the backlight brightness data corresponding to the at least one backlight partition, and send the backlight brightness data corresponding to the at least one backlight partition and the corresponding backlight scanning frequency to the corresponding backlight driving chip;

and the backlight driving chip is arranged to drive the corresponding backlight partition to emit light according to the backlight brightness data and the backlight scanning frequency issued by the time sequence controller.

the time schedule controller is configured to acquire backlight brightness data corresponding to the at least one backlight partition, and send the backlight brightness data corresponding to the at least one backlight partition to a corresponding backlight driving chip;

the backlight driving chip is configured to obtain a corresponding backlight scanning frequency according to the backlight brightness data issued by the time sequence controller, and drive the corresponding backlight partition to emit light according to the backlight brightness data and the corresponding backlight scanning frequency.

The embodiment of the disclosure also provides a display device, which comprises the backlight driving device according to any one of the embodiments.

The embodiment of the disclosure also provides a backlight driving method, which is applied to the backlight driving device of any one of the embodiments, wherein the backlight driving device comprises a time sequence controller and a backlight driving circuit, the time sequence controller is electrically connected with the backlight driving circuit, and the backlight driving circuit is electrically connected with a backlight plate; the backlight driving method includes:

The time sequence controller acquires backlight brightness data, acquires corresponding backlight scanning frequency according to the backlight brightness data, and sends the backlight brightness data and the corresponding backlight scanning frequency to the backlight driving circuit; wherein the backlight brightness data corresponding to low brightness corresponds to a lower backlight scanning frequency;

the backlight driving circuit drives the backlight plate to emit light according to the backlight brightness data and the backlight scanning frequency.

the time sequence controller obtains backlight brightness data, obtains corresponding backlight scanning frequency according to the backlight brightness data, and sends the backlight brightness data and the corresponding backlight scanning frequency to the backlight driving circuit, and the time sequence controller comprises: the time schedule controller obtains backlight brightness data corresponding to the at least one backlight partition, obtains corresponding backlight scanning frequency according to the backlight brightness data corresponding to the at least one backlight partition, and sends the backlight brightness data corresponding to the at least one backlight partition and the corresponding backlight scanning frequency to a corresponding backlight driving chip;

The backlight driving circuit drives the backlight plate to emit light according to the backlight brightness data and the backlight scanning frequency, and comprises: and the backlight driving chip drives the corresponding backlight partition to emit light according to the backlight brightness data and the corresponding backlight scanning frequency issued by the time sequence controller.

The time schedule controller acquires backlight brightness data and sends the backlight brightness data to the backlight driving circuit;

the backlight driving circuit obtains corresponding backlight scanning frequency according to the backlight brightness data and drives the backlight plate to emit light according to the backlight brightness data and the backlight scanning frequency; wherein the backlight brightness data corresponding to low brightness corresponds to a lower backlight scanning frequency.

In an exemplary embodiment, the backlight panel includes at least one backlight partition, the backlight driving circuit includes at least one backlight driving chip, the backlight driving chips are electrically connected to the timing controller, and each of the backlight partitions is electrically connected to one of the backlight driving chips;

the time schedule controller obtains backlight brightness data and sends the backlight brightness data to the backlight driving circuit station, and the time schedule controller comprises: the time schedule controller obtains backlight brightness data corresponding to the at least one backlight partition and sends the backlight brightness data corresponding to the at least one backlight partition to a corresponding backlight driving chip;

the backlight driving circuit obtains the corresponding backlight scanning frequency according to the backlight brightness data, and drives the backlight plate to emit light according to the backlight brightness data and the backlight scanning frequency, and comprises the following steps: and the backlight driving chip acquires corresponding backlight scanning frequency according to the backlight brightness data issued by the time sequence controller, and drives the corresponding backlight partition to emit light according to the backlight brightness data and the backlight scanning frequency.

The backlight driving device comprises a time sequence controller and a backlight driving circuit, wherein the time sequence controller or the backlight driving circuit can acquire corresponding backlight scanning frequency according to backlight brightness data, and the backlight brightness data corresponding to low brightness corresponds to lower backlight scanning frequency, and the backlight driving circuit drives a backlight plate to emit light according to the backlight brightness data and the backlight scanning frequency; in the scheme, the backlight brightness data corresponding to low brightness corresponds to lower backlight scanning frequency, so that the technical problem of uneven backlight brightness in low brightness can be solved.

Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the disclosure. Other advantages of the present disclosure may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain, without limitation, the disclosed embodiments. The shapes and sizes of various components in the drawings are not to scale true, and are intended to be illustrative of the present disclosure.

Fig. 1 is a schematic diagram of a backlight driving device according to an embodiment of the disclosure;

fig. 2 is a schematic diagram illustrating connection of a backlight driving device and an external system according to an exemplary embodiment of the present disclosure;

fig. 3 is a schematic diagram illustrating connection between a backlight driving device and a display module and a backlight panel according to an exemplary embodiment of the present disclosure;

fig. 4 is a schematic diagram illustrating connection between a backlight driving chip and a backlight board according to an exemplary embodiment of the disclosure;

fig. 5 is a schematic diagram illustrating connection between a backlight driving chip and a backlight board according to an exemplary embodiment of the disclosure;

FIG. 6 is a timing diagram of signals from a plurality of select output pins and signals from a plurality of channel pins;

FIG. 7 is a schematic diagram of the channel pin signal at a low brightness, higher backlight scanning frequency;

FIG. 8 is a schematic diagram of a plurality of channel pin signals at low brightness, low backlight scanning frequency provided by an embodiment of the present disclosure;

fig. 9 is a schematic diagram of a display device according to an embodiment of the disclosure;

FIG. 10 is a flowchart of a method for driving a backlight according to an embodiment of the present disclosure;

fig. 11 is a flowchart illustrating a backlight driving method according to an embodiment of the disclosure.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail hereinafter with reference to the accompanying drawings. Note that embodiments may be implemented in a number of different forms. One of ordinary skill in the art can readily appreciate the fact that the manner and content may be varied into a wide variety of forms without departing from the spirit and scope of the present disclosure. Accordingly, the present disclosure should not be construed as being limited to the following description of the embodiments. Embodiments of the present disclosure and features of embodiments may be combined with each other arbitrarily without conflict.

In the drawings, the size of each constituent element, the thickness of a layer, or a region may be exaggerated for clarity. Accordingly, one aspect of the present disclosure is not necessarily limited to this dimension, and the shapes and sizes of the various components in the drawings do not reflect actual proportions. Further, the drawings schematically show ideal examples, and one mode of the present disclosure is not limited to the shapes or numerical values shown in the drawings, and the like.

The ordinal numbers of "first", "second", "third", etc. in the present specification are provided to avoid mixing of constituent elements, and are not intended to be limited in number.

In the present specification, for convenience, words such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate an azimuth or a positional relationship, are used to describe positional relationships of constituent elements with reference to the drawings, only for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or elements referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus are not to be construed as limiting the present disclosure. The positional relationship of the constituent elements is appropriately changed according to the direction in which the respective constituent elements are described. Therefore, the present invention is not limited to the words described in the specification, and may be appropriately replaced according to circumstances.

In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly, unless explicitly stated or limited otherwise. For example, it may be a fixed connection, a removable connection, or an integral connection; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intermediate members, or may be in communication with the interior of two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art in the specific context.

In this specification, "electrically connected" includes a case where constituent elements are connected together by an element having some electric action. The "element having a certain electric action" is not particularly limited as long as it can transmit and receive an electric signal between the constituent elements connected. Examples of the "element having some electric action" include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, other elements having various functions, and the like.

The term "about" in this disclosure refers to values that are not strictly limited to the limits, but are allowed to fall within the limits of the process and measurement errors.

The Micro inorganic Light Emitting Diode can comprise a Micro Light Emitting Diode (Micro Light Emitting Diode, micro LED) and a sub-millimeter Light Emitting Diode (Mini Light Emitting Diode, mini LED), has the advantages of small size, high brightness and the like, can be widely applied to a backlight module of a display device, can achieve the level of an Organic Light-Emitting Diode (OLED) display product by utilizing the picture contrast of the display product of the Micro inorganic Light Emitting Diode backlight source, can enable the product to retain the technical advantage of liquid crystal display (Liquid Crystal Display, LCD) and further improve the display effect of pictures, and provides better visual experience for users. In addition, micro-inorganic light emitting diode display is becoming a hotspot of display panels, and is mainly applied to the fields of AR/VR, TV, outdoor display and the like.

Currently, micro inorganic light emitting diode backlights generally use a micro process technology to make the LED chips miniaturized, arrayed and thin-film, and mass-transfer the LED chips onto a backlight board. Typical dimensions (e.g., length) of Micro LEDs may be less than 100 μm, e.g., 10 μm to 50 μm. Typical dimensions (e.g., length) of Mini LEDs may be about 100 μm to 300 μm, such as 120 μm to 260 μm. The backlight plate is provided with a plurality of micro inorganic light emitting diodes. The backlight plate is divided into a plurality of light emitting areas. Each light emitting region includes one micro-inorganic light emitting diode or a plurality of micro-inorganic light emitting diodes in electrical connection. Each light emitting region may be independently controlled.

The display device is typically used with an external system, and the display device typically includes a backlight module (including a backlight plate), a timing controller, a source Driver circuit (Source Driver Integrated Circuit, S-IC) and a backlight Driver circuit (may be abbreviated as an LED Driver or an LED Driver), and in some application scenarios, the external system transmits display data and a backlight brightness percentage (Pulse Width Modulation, abbreviated as PWM) to the timing controller (Timing Controller, TCON, may also be referred to as a logic plate), and the timing controller performs the following operations: processing the display data of the whole frame to obtain processed display data, calculating backlight data according to the backlight brightness percentage (generally, calculating the backlight data by a region adjusting module in TCON), outputting the processed display data of the whole frame to a source driving circuit frame by frame (the source driving circuit controls the output of a display picture according to the processed display data), and transmitting the backlight data, the fixed backlight scanning frequency and the preset scanning sequence (which can be transmitted through an SPI protocol) to a backlight driving circuit (the backlight driving circuit drives a backlight board to emit light according to the backlight data). The backlight driving circuit generally performs scanning lighting on the backlight plate according to the backlight data, according to a fixed backlight scanning frequency and a preset scanning sequence corresponding to the backlight data (i.e. the backlight driving circuit drives the backlight plate to emit light according to the backlight number, the fixed backlight scanning frequency and the preset scanning sequence).

Because the ceramic capacitor in the display backlight driving circuit and the LED backlight module all contain piezoelectric materials, the piezoelectric materials can generate deformation in the periodic scanning process, so that vibration is caused, in order to avoid the frequency range (20 Hz-20 kHz) which can be heard by human ears, backlight scanning can fall at the frequency (belonging to high frequency) about 20kHz, and under the high scanning frequency, the backlight scanning can be influenced by the difference of a plurality of channels of the backlight driving circuit (the different duty ratio of the cycle time occupied by the rising and falling of the channel voltage) or the crosstalk influence (the higher the frequency, the larger the influence) between the running lines of the backlight board, so that the backlight brightness is uneven when the brightness is low.

The embodiment of the disclosure provides a backlight driving device, which can comprise a time sequence controller and a backlight driving circuit, wherein the time sequence controller is electrically connected with the backlight driving circuit, and the backlight driving circuit is electrically connected with a backlight plate;

According to the backlight driving device provided by the embodiment of the disclosure, the time sequence controller or the backlight driving circuit can obtain the corresponding backlight scanning frequency according to the backlight brightness data, the backlight brightness data corresponding to low brightness corresponds to the lower backlight scanning frequency, and the backlight driving circuit drives the backlight plate to emit light according to the backlight brightness data and the backlight scanning frequency; in the scheme, the backlight brightness data corresponding to low brightness corresponds to lower backlight scanning frequency, so that the technical problem of uneven backlight brightness in low brightness can be solved.

In an exemplary embodiment, as shown in fig. 1, the backlight driving apparatus 100 may include a timing controller 110 and a backlight driving circuit 120, the timing controller 110 being electrically connected to the backlight driving circuit 120, the backlight driving circuit 120 being electrically connected to a backlight board;

a timing controller 110 configured to acquire backlight luminance data and transmit the backlight luminance data to the backlight driving circuit 120;

the timing controller 110 or the backlight driving circuit 120 is configured to obtain a corresponding backlight scanning frequency according to the backlight brightness data, and to correspond the backlight brightness data corresponding to the low brightness to the lower backlight scanning frequency;

The backlight driving circuit 120 is configured to drive the backlight board to emit light according to the backlight brightness data and the backlight scanning frequency.

In an exemplary embodiment, the timing controller 110 or the backlight driving circuit 120 may correspond the backlight luminance data corresponding to the low luminance to a lower backlight scanning frequency, and scan the backlight luminance data corresponding to the lower luminance at the lower backlight scanning frequency when the backlight driving circuit 120 drives the backlight panel to emit light.

In an exemplary embodiment, in the case where the timing controller 110 is configured to acquire the corresponding backlight scanning frequency according to the backlight luminance data, the timing controller 110 may also be configured to transmit the corresponding backlight scanning frequency to the backlight driving circuit. In an exemplary embodiment, the timing controller 110 may be connected to the backlight driving circuit 120 through an SPI interface (Serial Peripheral Interface ), and accordingly, the timing controller 110 may transmit backlight brightness data and backlight scanning frequency to the backlight driving circuit 120 through an SPI protocol.

In an exemplary embodiment, the above-mentioned timing controller 110 or the backlight driving circuit 120 configured to obtain the corresponding backlight scanning frequency according to the backlight brightness data may include:

The timing controller 110 is configured to obtain a corresponding backlight scanning frequency according to a preset correspondence between brightness and frequency and backlight brightness data; the corresponding relation between the preset brightness and the frequency comprises a plurality of preset scanning frequencies and a plurality of corresponding preset backlight brightness, wherein the value of the preset backlight brightness corresponding to the lower preset scanning frequency is smaller than that of the preset backlight brightness corresponding to the higher preset scanning frequency; in an exemplary embodiment, the corresponding relationship between the preset brightness and the frequency may be pre-stored in the timing controller 110 in advance, for example, a memory may be provided in the timing controller 110 to store the corresponding relationship between the preset brightness and the frequency;

or, the backlight driving circuit 120 is configured to obtain the corresponding backlight scanning frequency according to the preset correspondence between brightness and frequency and the backlight brightness data; the corresponding relation between the preset brightness and the frequency comprises a plurality of preset scanning frequencies and a plurality of corresponding preset backlight brightness, wherein the value of the preset backlight brightness corresponding to the lower preset scanning frequency is smaller than that of the preset backlight brightness corresponding to the higher preset scanning frequency; in an exemplary embodiment, the preset correspondence between luminance and frequency may be pre-stored in the backlight driving circuit 120 in advance, for example, a memory may be provided in the backlight driving circuit 120 to store the preset correspondence between luminance and frequency.

In an exemplary embodiment, the backlight luminance data may include a backlight luminance value, and the plurality of preset backlight luminances may include a plurality of preset luminance values, each of which corresponds to one of the preset scanning frequencies in a correspondence of preset luminance to frequency;

obtaining a corresponding backlight scanning frequency according to a preset corresponding relation between brightness and frequency and backlight brightness data, wherein the method comprises the following steps: searching a preset brightness value corresponding to the average value of the backlight brightness, and taking the preset scanning frequency corresponding to the searched preset brightness value as the backlight scanning frequency.

In an exemplary embodiment, the plurality of preset backlight luminances may include a plurality of preset luminance value ranges formed by dividing the plurality of preset luminance values, and in a correspondence between preset luminance and frequency, each preset luminance value range corresponds to one of the preset scanning frequencies;

the searching for the preset brightness value corresponding to the brightness average value of the backlight partition, taking the preset scanning frequency corresponding to the searched preset brightness value as the backlight scanning frequency, may include: searching a value range of a preset brightness value corresponding to the brightness value of the backlight, and taking a preset scanning frequency corresponding to the value range of the searched preset brightness value as the backlight scanning frequency.

In an exemplary embodiment, a plurality of preset brightness value ranges and preset scan frequencies corresponding to each preset brightness value range may be stored in the timing controller 110 or the backlight driving circuit 120, and a correspondence relationship between the preset brightness value range and the preset scan frequency may be preset, and when the preset brightness value is large (i.e., high brightness) in the setting, a higher preset scan frequency may be corresponding; when the preset brightness value is small (i.e. low brightness), the corresponding lower preset scanning frequency is shown in table 1, which is a corresponding relation table between the preset brightness value and the scanning frequency (the preset backlight brightness includes a plurality of preset brightness value ranges formed by dividing the preset brightness values, and each preset brightness value range corresponds to one of the preset scanning frequencies):

TABLE 1 correspondence table between preset luminance values and preset scanning frequencies

Preset brightness value	Preset scanning frequency	Correspondence table
			0-c(1)	s(1)	D(1)
c(1)-c(2)	s(2)	D(2)
			c(2)-c(3)	s(3)	D(3)
…	…	…
			c (n) -theoretical maximum	s(n)	D(n)

In table 1, c (1) to c (n) are a plurality of preset brightness values, n is an integer greater than or equal to 1, 0<c (n) < theoretical maximum value of preset brightness values, s (n) is a preset scanning frequency, D (n) is a correspondence table, a value range of one preset brightness value corresponds to one of the preset scanning frequencies, for example, the correspondence table D (2) stores the correspondence between the value ranges of the preset brightness values c (1) -c (2) and the preset scanning frequency s (2). In an exemplary embodiment, when the average value of the backlight brightness is within the range of the preset brightness values of c (1) -c (2), the preset scanning frequency s (2) stored in the correspondence table D (2) may be used as the backlight scanning frequency.

In an exemplary embodiment, in table 1, the values of the preset luminance values c (1) to c (n) are sequentially increased, the values of the preset scan frequencies s (1) to s (n) are sequentially increased, for example, the minimum preset scan frequency s (1) may be set to 120Hz, the value of the maximum preset scan s (n) may be set to 21kHz, the preset luminance value may be a luminance percentage, for example, the preset luminance value c (1) may be set to 20%, the preset luminance value c (n) may be set to 80%, and the theoretical maximum value of the preset luminance value may be set to 90% or 100%.

In an exemplary embodiment, the backlight luminance data may include backlight luminance values, and the plurality of preset backlight luminances include preset maximum backlight luminance values, preset minimum backlight luminance values; the plurality of preset scanning frequencies comprise preset maximum backlight scanning frequencies and preset minimum backlight scanning frequencies; in the corresponding relation between the preset brightness and the frequency, the preset maximum backlight brightness value corresponds to the preset maximum backlight scanning frequency, and the preset minimum backlight brightness value corresponds to the preset minimum backlight scanning frequency; the obtaining the corresponding backlight scanning frequency according to the preset correspondence between the brightness and the frequency and the backlight brightness data may include:

taking the preset maximum backlight scanning frequency as the backlight scanning frequency under the condition that the backlight brightness value is larger than or equal to the preset maximum backlight brightness value;

and under the condition that the backlight brightness value is larger than the preset minimum backlight brightness value and smaller than the preset maximum backlight brightness value, calculating the backlight scanning frequency according to the preset maximum backlight brightness value, the preset minimum backlight brightness value, the preset maximum backlight scanning frequency and the preset minimum backlight scanning frequency.

In an exemplary embodiment, in the case that the backlight luminance value is greater than a preset minimum backlight luminance value and less than a preset maximum backlight luminance value, the backlight scanning frequency is calculated according to the following formula (i.e., the backlight scanning frequency is calculated using interpolation):

wherein, fbn table is backlight scanning frequency, fmin is preset minimum backlight scanning frequency, fmax is preset maximum backlight scanning frequency, bmax is preset maximum backlight brightness value, bmin is preset minimum backlight brightness value, and bn is backlight brightness value.

In an exemplary embodiment, as shown in table 2, the preset backlight brightness includes a preset maximum backlight brightness value bmax, a preset minimum backlight brightness value bmin, a preset maximum backlight scanning frequency fmax, a preset minimum backlight scanning frequency fmin, and a corresponding relationship between the backlight scanning frequency and the corresponding preset brightness value calculated by interpolation method:

Table 2 preset brightness value and preset scan frequency correspondence table

Wherein bn is a backlight luminance value, fmin is a preset minimum scanning frequency, fmax is a maximum scanning frequency, bmax is a preset maximum backlight luminance value, bmin is a preset minimum backlight luminance value, and when the backlight luminance value bn is greater than the preset minimum backlight luminance value bmin and less than the preset maximum backlight luminance value bmax, the preset scanning frequency fbn is calculated by adopting an interpolation method according to the backlight luminance average value bn, and the calculated preset scanning frequency fbn is used as the backlight scanning frequency.

In table 2, in the case where the backlight luminance value bn is less than or equal to the preset minimum backlight luminance value bmin, the preset minimum backlight scanning frequency fmin is taken as the backlight scanning frequency;

taking a preset maximum backlight scanning frequency fmax as a backlight scanning frequency under the condition that the backlight sub-brightness value bn is larger than or equal to a preset maximum backlight brightness average value bmax;

under the condition that the backlight brightness value bn is larger than the preset minimum backlight brightness value bmin and smaller than the preset maximum backlight brightness value bmax, calculating the preset scanning frequency fbn by adopting an interpolation method according to the backlight brightness average value bn, and taking the calculated preset scanning frequency fbn as the backlight scanning frequency rate.

In an exemplary embodiment, in table 2, the preset luminance value may be a luminance percentage, for example, a preset minimum backlight luminance value bmin to be set to 20%, a preset maximum backlight luminance average bmax may be set to 80%, and a theoretical maximum value of the preset luminance value may be set to 100% or 90%; the value of the preset minimum backlight scanning frequency fmin may be set to 120Hz and the value of the preset maximum backlight scanning frequency fmax may be set to 21kHz.

In an exemplary embodiment, the backlight brightness value may include a pulse width modulation signal duty ratio, and the preset brightness value may include a preset pulse width modulation signal duty ratio. In an exemplary embodiment, the pulse width modulation signal duty ratio (PWM duty) may be a high level pulse width modulation signal duty ratio (i.e., PWM high level duty ratio), in which a larger preset pulse width modulation signal duty ratio corresponds to a higher preset scanning frequency, and a smaller preset pulse width modulation signal duty ratio corresponds to a lower preset scanning frequency, i.e., a larger PWM duty corresponds to a higher preset scanning frequency, and a smaller PWM duty corresponds to a lower preset scanning frequency.

The following description will take the example that the backlight brightness data adopts the duty ratio of the pulse width modulation signal (i.e. the backlight brightness value adopts the duty ratio of the pulse width modulation signal):

in an exemplary embodiment, the backlight luminance data may include a pulse width modulation signal duty (Pulse Width Modulation duty, PWM duty), and the plurality of preset backlight luminances may include a plurality of preset pulse width modulation signal duty (PWM duty), each of which corresponds to one of the preset scanning frequencies in a correspondence of preset luminances to frequencies;

the obtaining the corresponding backlight scanning frequency according to the preset correspondence between the brightness and the frequency and the backlight brightness data may include: searching a preset pulse width modulation signal duty ratio corresponding to the pulse width modulation signal duty ratio, and taking a preset scanning frequency corresponding to the searched preset pulse width modulation signal duty ratio as a backlight scanning frequency.

In an exemplary embodiment, the plurality of preset backlight brightnesses may include a value range of a plurality of preset pwm signal duty cycles formed by dividing the plurality of preset pwm signal duty cycles, and in a correspondence between preset brightnesses and frequencies, the value range of each preset pwm signal duty cycle corresponds to one of the preset scanning frequencies;

The searching for the preset pwm signal duty ratio corresponding to the pwm signal duty ratio, and taking the preset scanning frequency corresponding to the searched preset pwm signal duty ratio as the backlight scanning frequency may include: searching a value range of a preset pulse width modulation signal duty ratio corresponding to the pulse width modulation signal duty ratio, and taking a preset scanning frequency corresponding to the value range of the searched preset pulse width modulation signal duty ratio as a backlight scanning frequency.

In an exemplary embodiment, the brightness of the backlight can be adjusted by adopting a pulse width modulation (Pulse Width Modulation, PWM) mode, that is, the brightness of a backlight module (the backlight module comprises a backlight plate) can be adjusted by changing the duty ratio (duty) of a PWM signal, and the larger the PWM duty is, the higher the overall brightness of the display is; conversely, the smaller the PWM duty, the lower the overall brightness of the display (PWM duty can be understood as the percentage of backlight brightness). The correspondence between the duty ratio of the preset PWM signal and the preset scanning frequency may be set in advance in the timing controller 110 or the backlight driving circuit 120, and when the correspondence is large in terms of backlight brightness (i.e., high brightness, large PWM duty), the high scanning frequency (corresponding to the high preset scanning frequency) is used; when the backlight brightness is small (i.e., low brightness, PWM duty is small), a low scanning frequency (corresponding to a lower preset scanning frequency) is used; as shown in table 3, the table is a correspondence table between the preset PWM duty and the preset scanning frequency, and the table includes correspondence relations between a plurality of preset PWM signal duty ratios (preset PWM duty) (i.e. backlight brightness percentages) and a plurality of corresponding preset scanning frequencies:

TABLE 3 correspondence table of preset PWM duty and preset scan frequency

Presetting PWM duty	Preset scanning frequency	Correspondence table
			0-a(1)	b(1)	A(1)
a(1)-a(2)	b(2)	A(2)
			a(2)-a(3)	b(3)	A(3)
…	…	…
			a(n)-100％	b(n)	A(n)

In table 3, a (1) to a (n) are a plurality of preset PWM duty, n is an integer greater than or equal to 1, 0<a (n) <100%, b (n) is a preset scanning frequency, a (n) is a correspondence between the preset PWM duty and the preset scanning frequency, in table 3, a value range of each preset PWM signal duty corresponds to one of the preset scanning frequencies, for example, the correspondence table (A1) maintains a correspondence between the preset PWM duty with an access value range of 0-a (1) and the preset scanning frequency with a value of b (1), and when the value of the PWM signal duty is within the range of 0-a (1), the preset scanning frequency b (1) stored in the correspondence table a (1) can be used as a backlight scanning frequency.

In an exemplary embodiment, in table 3, the values of the preset PWM duty a (1) to a (n) are sequentially increased, the values of the preset scan frequencies b (1) to b (n) are sequentially increased, for example, the minimum preset scan frequency s (1) may be set to 120Hz, the maximum preset scan s (n) may be set to 21kHz, the preset PWM duty may be understood as a luminance percentage, for example, the preset PWM duty a (1) may be set to 20%, the preset PWM duty a (n) may be set to 80%, and the theoretical maximum value of the preset PWM duty may be set to 90% or 100%;

In an exemplary embodiment, the backlight brightness data may include a pulse width modulation signal duty cycle, and the plurality of preset backlight brightness may include a preset maximum pulse width modulation signal duty cycle, a preset minimum pulse width modulation signal duty cycle; the plurality of preset scanning frequencies may include a preset maximum backlight scanning frequency, a preset minimum backlight scanning frequency; in the corresponding relation between the preset brightness and the frequency, the preset maximum pulse width modulation signal duty ratio corresponds to the preset maximum backlight scanning frequency, and the preset minimum pulse width modulation signal duty ratio corresponds to the preset minimum backlight scanning frequency; the obtaining the corresponding backlight scanning frequency according to the preset correspondence between the brightness and the frequency and the backlight brightness data may include:

taking a preset minimum backlight scanning frequency as a backlight scanning frequency under the condition that the duty ratio of the pulse width modulation signal is smaller than or equal to the preset minimum pulse width modulation signal duty ratio;

taking a preset maximum backlight scanning frequency as a backlight scanning frequency under the condition that the duty ratio of the pulse width modulation signal is larger than or equal to the preset maximum pulse width modulation signal duty ratio;

and calculating the backlight scanning frequency according to the preset maximum pulse width modulation signal duty ratio, the preset minimum pulse width modulation signal duty ratio, the preset maximum backlight scanning frequency and the preset minimum backlight scanning frequency under the condition that the pulse width modulation signal duty ratio is larger than the preset minimum pulse width modulation signal duty ratio and smaller than the preset maximum pulse width modulation signal duty ratio.

In an exemplary embodiment, in the case where the pulse width modulation signal duty cycle is greater than a preset minimum pulse width modulation signal duty cycle and less than a preset maximum pulse width modulation signal duty cycle, the backlight scan frequency is calculated according to the following formula (i.e., the backlight scan frequency is calculated using interpolation):

/>

wherein, fan table is backlight scanning frequency, fmin is the minimum backlight scanning frequency of predetermineeing, fmax is the maximum backlight scanning frequency of predetermineeing, amax is the maximum pulse width modulation signal duty cycle of predetermineeing, amin is the minimum pulse width modulation signal duty cycle of predetermineeing, an is pulse width modulation signal duty cycle.

In an exemplary embodiment, as shown in table 4, the preset backlight brightness includes a corresponding relationship between a preset maximum PWM signal duty amax, a preset minimum PWM signal duty amin and a corresponding preset maximum backlight scanning frequency fmax, a corresponding relationship between a preset minimum backlight scanning frequency fmin, and a corresponding relationship between a backlight scanning frequency and a corresponding PWM duty calculated by interpolation method:

TABLE 4 correspondence table of preset PWM duty and preset scan frequency

In table 4, the preset minimum pulse width modulation signal duty ratio amin is greater than or equal to 0 and less than the preset maximum pulse width modulation signal duty ratio amax, the preset maximum pulse width modulation signal duty ratio amax is greater than the preset minimum pulse width modulation signal duty ratio amin and less than or equal to 100%, and the preset scanning frequency fan calculated by interpolation method can be greater than the preset minimum backlight scanning frequency fmin and less than the preset maximum backlight scanning frequency fmax.

In table 4, in the case where the pulse width modulation signal duty ratio an is less than or equal to the preset minimum pulse width modulation signal duty ratio amin, the preset minimum backlight scanning frequency fmin is taken as the backlight scanning frequency;

taking a preset maximum backlight scanning frequency fmax as a backlight scanning frequency under the condition that the pulse width modulation signal duty ratio an is larger than or equal to a preset maximum pulse width modulation signal duty ratio amax;

under the condition that the pulse width modulation signal duty ratio an is larger than the preset minimum pulse width modulation signal duty ratio amin and smaller than the preset maximum pulse width modulation signal duty ratio amax, calculating to obtain a preset scanning frequency fan according to an interpolation method, and taking the calculated preset scanning frequency as a backlight scanning frequency.

In an exemplary embodiment, in table 4, the preset PWM duty may be understood as a luminance percentage, for example, the preset minimum PWM signal duty amin may be set to 20%, the preset maximum PWM signal duty amax may be set to 80%, and the theoretical maximum value of the preset PWM duty may be set to 100% or 90%; the value of the preset minimum backlight scanning frequency fmin may be set to 120Hz and the value of the preset maximum backlight scanning frequency fmax may be set to 21kHz.

In an exemplary embodiment, as shown in fig. 2, the timing controller 110 may be electrically connected to the external system 10, and the timing controller 110 may be configured to acquire backlight brightness data, and may include: the timing controller 110 is configured to acquire a backlight luminance value from the external system 10. For example, the timing controller 110 may be configured to obtain the pulse width modulation signal duty ratio from the external system 10, i.e., the external system 10 directly transmits the pulse width modulation signal duty ratio (i.e., the duty ratio of the pulse width modulation high level signal) to the timing controller 110, without the timing controller 110 calculating the pulse width modulation signal duty ratio from the image data.

In an exemplary embodiment, as shown in fig. 2, the timing controller 110 may be electrically connected to the external system 10, and the timing controller 110 may be configured to acquire backlight brightness data, and may include: the timing controller 110 may be configured to acquire image data from the external system 10 and calculate a backlight luminance value from the image data. For example, the timing controller 110 may be configured to obtain the image data from the external system 10, calculate the duty ratio of the pulse width modulation signal according to the image data, that is, after the external system 10 sends the image data to the timing controller 110, the timing controller 110 obtains all pulse width modulation signals (including the pulse width modulation high level signal and the pulse width modulation low level signal) according to the image data, and calculate the duty ratio of the pulse width modulation high level signal in all pulse width modulation signals, to obtain the duty ratio of the pulse width modulation signal.

In an exemplary implementation, fig. 3 is a schematic structural diagram of a display device according to an embodiment of the disclosure. As shown in fig. 3, a display device provided by an embodiment of the present disclosure may include: backlight driving device 100, backlight panel 200, display module 300, and display driving circuit 400. The display driving circuit 400 (which may be a source driving circuit S-IC) may include at least one display driving chip 401, the backlight driving device 100 may include a timing controller 110, a backlight driving circuit 120, and the backlight driving circuit 120 may include at least one backlight driving chip 121. Fig. 3 illustrates an example in which the display driving circuit 400 includes two display driving chips 401 and the backlight driving circuit 120 includes three backlight driving two driving chips 121. The backlight board 200 may include a plurality of backlight partitions, and each backlight driving chip 121 may correspond to at least one backlight partition. Fig. 3 illustrates an example in which each driving chip 121 corresponds to one backlight section H.

In an exemplary embodiment, as shown in fig. 3, the display driving chip 401 may be disposed on the display module 300 or may be disposed at a side of the backlight 200 remote from the display module 300.

In an exemplary embodiment, the backlight driving chip 121 and the timing controller 110 may be disposed at a side of the backlight 200 remote from the display module 300.

In an exemplary embodiment, as shown in fig. 3, the display device may further include: at least one printed circuit board 500, the printed circuit board 500 and the backlight driving chip 121 are in one-to-one correspondence, and the backlight driving chip 121 is electrically connected with the backlight board 200 through the corresponding printed circuit board 400.

In an exemplary embodiment, the acquiring the backlight brightness data may include: the timing controller 110 obtains a plurality of backlight luminance values corresponding to the plurality of backlight partitions, calculates a backlight luminance average value of the plurality of backlight partitions according to the plurality of backlight luminance values corresponding to the plurality of backlight partitions, and takes the backlight luminance average value as the backlight luminance value; in an exemplary embodiment, the backlight luminance average for all backlight partitions may be calculated by the following formula:

wherein m is the total number of all backlight partitions, BLDi represents the backlight brightness value of the ith backlight partition, aveBLD is the backlight brightness average value of all backlight partitions, 0< m, 0< i.ltoreq.m.

In an exemplary embodiment, the acquiring the backlight brightness data may include: the timing controller 110 obtains a plurality of backlight luminance values corresponding to the plurality of backlight partitions, respectively, obtains a maximum backlight luminance value from the plurality of backlight luminance values corresponding to the plurality of backlight partitions, and uses the maximum backlight luminance value as the backlight luminance value.

In an exemplary embodiment, the timing controller 110 acquires a plurality of backlight luminance values corresponding to a plurality of backlight partitions, respectively, may include: the timing controller 110 is configured to acquire image data from the external system 10, and call a region adjustment module (local dimming module) to calculate a plurality of backlight luminance values corresponding to the plurality of backlight partitions H.

In an exemplary embodiment, as shown in fig. 3, the backlight board 200 may include at least one backlight partition H, and the backlight driving circuit 120 may include at least one backlight driving chip 121, the backlight driving chip 121 being electrically connected to the timing controller, each backlight partition H being electrically connected to one of the backlight driving chips 121;

the timing controller 110 may be configured to obtain backlight brightness data corresponding to at least one backlight partition, obtain a corresponding backlight scanning frequency according to the backlight brightness data corresponding to the at least one backlight partition, and send the backlight brightness data corresponding to the at least one backlight partition and the corresponding backlight scanning frequency to a corresponding backlight driving chip;

the backlight driving chip 121 may be configured to drive the corresponding backlight partition to emit light according to the backlight brightness data and the backlight scanning frequency issued by the timing controller 110.

In an exemplary embodiment, as shown in fig. 3, the backlight board 200 may include at least one backlight partition, the backlight driving circuit 120 may include at least one backlight driving chip 121, the backlight driving chip 121 is electrically connected to the timing controller 110, and each backlight partition is electrically connected to one of the backlight driving chips 121;

the timing controller 110 may be configured to acquire backlight luminance data corresponding to at least one backlight partition, and send the backlight luminance data corresponding to the at least one backlight partition to a corresponding backlight driving chip;

the backlight driving chip 121 is configured to obtain a corresponding backlight scanning frequency according to the backlight brightness data sent by the timing controller 110, and drive the corresponding backlight to emit light according to the backlight brightness data and the corresponding backlight scanning frequency.

In an exemplary embodiment, fig. 4 is a schematic connection diagram of the backlight driving chip 121 and the backlight board 200 provided in an exemplary embodiment, and fig. 5 is a schematic connection diagram of the backlight board 200 provided in an exemplary embodiment. In an exemplary embodiment, as shown in fig. 4 and 5, the backlight 200 includes: a plurality of light emitting regions L, at least one of which includes: at least one light emitting device. The light emitting device includes: the light emitting device may be a micro LED.

In an exemplary embodiment, as shown in fig. 4, the backlight driving chip 121 may include: a plurality of input pins, a plurality of first power pins, a plurality of second power pins, a plurality of selection output pins MUX1 to MUXM, and a plurality of pass pins CH1 to CHN. In the exemplary embodiment, fig. 4 is illustrated with m=8, n=72 as an example.

In the configuration shown in fig. 4, the driving circuit 120 includes a backlight driving chip 121, and the backlight board 200 includes 8×72 backlight areas (i.e., 576 backlight areas), in the exemplary embodiment. In the backlight shown in fig. 4: the backlight areas can be divided according to 576 backlight areas of 8 rows and 72 columns, namely, each light emitting device corresponds to one backlight partition; or the backlight partitions may be divided in a row direction, for example, one backlight partition may correspond to one or more columns (the number of columns is less than 72) of light emitting devices; or the backlight partitions may be divided in a column direction, for example, one backlight partition may correspond to one or more rows (the number of rows is less than 8) of light emitting devices; or the backlight subareas may be divided according to the array, for example, one backlight subarea may correspond to a plurality of light emitting devices arranged in an array, and the number of rows of the corresponding light emitting devices in one backlight subarea is less than 8, and the number of columns of the corresponding light emitting devices in one backlight subarea is less than 72.

In the structure shown in fig. 5, the driving circuit 120 may include one or more backlight driving chips 121, and the backlight panel 200 includes 8×36 backlight regions (i.e., 288 backlight regions), in an exemplary embodiment. In the backlight shown in fig. 5: the backlight areas can be divided according to 288 backlight areas of 8 rows and 36 columns, namely, each light-emitting device corresponds to one backlight partition; or the backlight partitions may be divided in a row direction, for example, one backlight partition may correspond to one or more columns (the number of columns is less than 36) of light emitting devices; or the backlight partitions may be divided in a column direction, for example, one backlight partition may correspond to one or more rows (the number of rows is less than 8) of light emitting devices; or the backlight partitions may be divided according to the array, for example, one backlight partition may correspond to a plurality of light emitting devices arranged in an array, the number of rows of the light emitting devices corresponding to one backlight partition is less than 8, and the number of columns of the light emitting devices corresponding to one backlight partition is less than 36, for example, one backlight partition may correspond to one column of the light emitting devices and three columns of the light emitting devices in fig. 5, that is, one backlight partition corresponds to three light emitting devices.

In an exemplary embodiment, the backlight driving chip 121 may include: a data selector. The data selector is provided with an input end and a plurality of output ends, and signals received by the input ends can be output from different output ends in a time sharing mode. The plurality of output terminals in the data selector are in one-to-one correspondence with the plurality of selection output pins in the backlight driving chip 121, and signals of the output terminals are output through the corresponding selection output pins.

In an exemplary embodiment, as shown in fig. 4, the input pins of the backlight driving chip 121 may include: vertical synchronization pin vsync, enable pin EN, debug pin INT, serial peripheral interface pin. Wherein, the serial peripheral interface pin includes: synchronous clock pin SCK, chip select pin CSB, serial peripheral interface input pin MOSI, and serial peripheral interface output pin MISO.

In an exemplary embodiment, as shown in fig. 4, the plurality of first power pins of the backlight driving chip 121 may include: backlight power supply pin PVDD, backlight ground pin PGND, feedback pin DFB, and feedback ground pin SGND.

In an exemplary embodiment, as shown in fig. 4, the plurality of second power pins of the backlight driving chip 121 may include: an analog power supply pin AVDD and an analog ground pin AGND.

In an exemplary embodiment, the vertical synchronization pin vsync is a pin transmitting a vertical synchronization signal.

In an exemplary embodiment, the enable pin EN is a pin controlling the operation time of the backlight driving chip 121, and when the signal transmitted by the enable signal EN is a high level signal, the backlight driving chip 121 operates normally.

In an exemplary embodiment, the debug pin INT is a pin for detecting whether a short circuit exists in the backlight panel.

In an exemplary embodiment, the serial peripheral interface pin is a pin that transmits backlight data.

In an exemplary embodiment, the backlight power supply pin PVDD is a pin for supplying power to the backlight board.

In an exemplary embodiment, the backlight ground pin PGND is a ground pin corresponding to a signal transmitted by the backlight power supply pin PVDD.

In an exemplary embodiment, the feedback pin DFB is a pin for adjusting a voltage value of a signal transmitted from the backlight power supply pin PVDD by detecting a current flowing through the light emitting device in the backlight panel.

In an exemplary embodiment, the feedback ground pin SGND is a ground pin corresponding to the signal transmitted by the feedback pin DFB.

In an exemplary embodiment, the analog power supply pin AVDD is a pin that supplies power to a device of the backlight driving chip 121 that processes an analog signal.

In an exemplary embodiment, the analog ground pin AGND is a ground pin corresponding to a signal transmitted by the analog power supply pin AVDD.

In an exemplary embodiment, as shown in fig. 4, the backlight driving chip 121 may further include: filter pin CPLL and resistance setting pin ISET.

In an exemplary embodiment, the filter pin CPLL may be a pin that reduces noise of the signal of the analog supply pin.

In an exemplary embodiment, the resistance setting pin ISET may be a pin that sets the ground resistance of the backlight driving chip 121, and the signal of ISET may set the maximum current that the light emitting device in the backlight board may flow.

In an exemplary embodiment, the filter pin CPLL and the resistance setting pin ISET are electrically connected to ground, respectively.

In an exemplary embodiment, a plurality of backlight partitions in the backlight panel 120 may be divided in a row direction, i.e., each backlight partition may correspond to a plurality of columns of light emitting regions; alternatively, the plurality of backlight partitions in the backlight panel 120 may be divided in a column direction, that is, each backlight partition may correspond to a plurality of columns and rows of light emitting areas, or the plurality of backlight partitions in the backlight panel 102 may be arranged in an array.

In an exemplary embodiment, as shown in fig. 4 and 5, a plurality of light emitting regions may be arranged in an array, and each backlight region may include one or more light emitting regions L.

In an exemplary embodiment, a plurality of light emitting devices located in the same light emitting region may be arranged in a row direction, or may be arranged in a column direction, or may be arranged in an array. For example, as shown in fig. 5, three light emitting devices located in the same light emitting region L may be arranged in a column direction, and each backlight region corresponds to one light emitting region, and a plurality of backlight regions are arranged in an array.

In the exemplary embodiment, as shown in fig. 4 and 5, at least one backlight control chip 121 is electrically connected to a plurality of light emitting areas L, fig. 4 is illustrated by taking m=8, n=72, and one light emitting area L includes one micro inorganic light emitting diode as an example, and fig. 5 is illustrated by taking m=8, n=36, and one light emitting area L includes a plurality of micro inorganic light emitting diodes as an example.

In an exemplary embodiment, as shown in fig. 4, the backlight 200 includes: m rows and N columns of light emitting regions. The light emitting region in the mth row is electrically connected to the mth select output pin MUXm, for example, the light emitting region in the first row is electrically connected to the first select output pin MUX1, the light emitting region in the second row is electrically connected to the second select output pin MUX2, and so on. The light emitting region in the nth column is electrically connected with the nth channel pin, for example, the light emitting region in the first column is electrically connected with the first channel pin CH1, the light emitting region in the second column is electrically connected with the second channel pin CH2, M is 1-M, and N is 1-N.

In an exemplary embodiment, as shown in fig. 5, the backlight 200 includes: 3M rows of N/3 columns of light emitting areas. The light emitting regions in the 3m-2 to 3m rows are electrically connected to the m-th select output pin MUX, for example, the light emitting regions in the first to third rows are electrically connected to the first select output pin MUX1, the light emitting regions in the fourth to sixth rows are electrically connected to the second select output pin MUX2, and so on. The light emitting region in the kth column of the 3m-2 row is electrically connected with the 3k-2 channel pins, the light emitting region in the kth column of the 3m-1 row is electrically connected with the 3k-1 channel pins, the light emitting region in the kth column of the 3m row is electrically connected with the 3k channel pins, the light emitting region in the first column of the first row is electrically connected with the first channel pin CH1, the light emitting region in the second column of the first row is electrically connected with the fourth channel pin CH4, the light emitting region in the third column of the first row is electrically connected with the seventh channel pin CH7, and so on, which is not limited in this disclosure.

The backlight driving device provided by the embodiment of the disclosure can change the backlight scanning frequency from a fixed value to a dynamic value, and the backlight brightness is related to the brightness information (image data of a system) at the front end, when the high brightness is achieved, the high backlight scanning frequency (usually the high backlight scanning frequency is more than 20KHz and is not normally heard by human ears) is used, so that the influence of high-frequency howling can be reduced; at low brightness, the backlight scanning frequency is reduced, so that uneven brightness is avoided, and the picture quality is improved; in addition, since the frequency at the time of low brightness may be set within the frequency band which can be heard by the human ear, the vibration amplitude is small, and the generated vibration is also small, the influence of howling generated by setting the low backlight scanning frequency at the time of low brightness is small, or even none.

Fig. 6 is a timing diagram of signals of a plurality of select output pins (MUX 1 to MUX 8) and signals of a plurality of channel (CH 1 to CH 72) pins. In an exemplary embodiment, as shown in fig. 6, the output times of signals of any two of the plurality of selection output pins do not overlap, and the output times of signals of any two of the plurality of channel pins do not overlap. Fig. 6 illustrates an example of selecting the number of output pins s=8 and the number of channel pins t=72. As shown in fig. 6, the times at which the plurality of selection output pins output signals are located within the time at which the vertical synchronization signal (vsync) is at a low level; the output time of the signal of any one channel pin overlaps with the output time of the signal of any one select output pin, and the output time of the signal of any one select output pin is greater than or equal to the sum of the output times of the signals of the plurality of channel pins.

In an exemplary embodiment, each Channel (CH) pin generally has a rising edge and a falling edge, and the rising edge and the falling edge of the plurality of Channel (CH) pins have different time periods, so that the rising edge or the falling edge of some channel pins have longer time periods, and in the case of a low brightness and a higher backlight scanning frequency, the time period of a high-level signal is shorter because of a lower PWM duty, the time period of the high-level signal before the rising edge arrives has ended, so that the signal of the channel does not reach the expected high level, so that the light emitting area corresponding to the backlight plate cannot reach the expected brightness, and the channel pins with shorter time periods of other rising edges and falling edges can reach the high level, so that the light emitting area corresponding to the backlight plate can reach the expected brightness, and therefore, in the case of a higher backlight scanning frequency, the problem of uneven brightness often occurs at the time of low brightness because the rising edge or the falling edge of the plurality of channel pins is inconsistent.

As shown in fig. 7, in a schematic diagram of a Channel (CH) pin signal under the condition of low brightness and higher backlight scanning frequency, because the low brightness PWM duty ratio is relatively low, the higher backlight scanning frequency results in a shorter signal time of each channel, as in fig. 7, the rising edge time of the first channel CH1 is longer than that of the second channel CH2 and shorter than that of the seventy-two channels CH72, the highest reached level of the first channel CH1 is Z3, the highest reached level of the second channel CH2 is Z2, the highest reached level of the seventy-two normal CH72 is Z4, wherein Z1 is the level signal of the channel pin after no electric signal is applied, and Z2 is the expected signal level of the channel pin after the electric signal is applied, in fig. 7, the rising edge time of the first channel CH1, the second channel CH2 and the seventy-two channels CH72 are different, and the highest reached level finally is different, as can be seen from fig. 7, Z2 > Z3 > Z4, and the light-emitting area of the first channel CH1 corresponds to the light-emitting area of the backlight panel when the light-emitting area corresponds to the second channel CH2, and the light-emitting area corresponds to the dark area when the light-emitting area of the backlight panel corresponds to the light-emitting area of the backlight panel.

As shown in fig. 8, a schematic diagram of a plurality of Channel (CH) pin signals under the condition of low brightness and low backlight scanning frequency is shown, and although the low brightness PWM duty ratio is low, the low backlight scanning frequency makes the signal time of each channel long enough, compared with fig. 7, under the condition that the rising edge time of the first channel CH1, the second channel CH2 and the channel CH72 is unchanged, the first channel CH1, the second channel CH2 and the channel CH72 in fig. 8 can reach the expected high level Z2 before the rising edge (only because of the inconsistent rising edge time, but the time reaching the highest level Z2 is inconsistent, but the light emitting area of the backlight board corresponding to the plurality of through (CH) pins can be made to be even.

The embodiment of the disclosure further provides a display device, as shown in fig. 9, which may include the backlight driving device described in any of the above embodiments.

In an exemplary embodiment, the display device may be: any product or component with display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame or a navigator.

The embodiment of the disclosure also provides a backlight driving method, which is applied to the backlight driving device of any one of the embodiments, wherein the backlight driving device comprises a time sequence controller and a backlight driving circuit, the time sequence controller is electrically connected with the backlight driving circuit, and the backlight driving circuit is electrically connected with a backlight plate; the backlight driving method may include:

In an exemplary embodiment, as shown in fig. 10, the backlight driving method may include:

step S11: the time sequence controller acquires backlight brightness data, acquires corresponding backlight scanning frequency according to the backlight brightness data, and sends the backlight brightness data and the corresponding backlight scanning frequency to the backlight driving circuit; wherein the backlight brightness data corresponding to low brightness corresponds to a lower backlight scanning frequency;

Step S12: the backlight driving circuit drives the backlight plate to emit light according to the backlight brightness data and the backlight scanning frequency.

In an exemplary embodiment, the backlight panel may include at least one backlight partition, the backlight driving circuit includes at least one backlight driving chip electrically connected to the timing controller, and each backlight partition is electrically connected to one of the backlight driving chips;

step S11 may include: the time sequence controller obtains backlight brightness data corresponding to at least one backlight partition, obtains corresponding backlight scanning frequency according to the backlight brightness data corresponding to the at least one backlight partition, and sends the backlight brightness data corresponding to the at least one backlight partition and the corresponding backlight scanning frequency to the corresponding backlight driving chip;

step S12 may include: and the backlight driving chip drives the corresponding backlight partition to emit light according to the backlight brightness data and the corresponding backlight scanning frequency issued by the time sequence controller.

In an exemplary embodiment, the step S11 of the timing controller obtaining the corresponding backlight scanning frequency according to the backlight brightness data may include step S111: the time sequence controller obtains the corresponding backlight scanning frequency according to the preset corresponding relation between the brightness and the frequency and the backlight brightness data; the corresponding relation between the preset brightness and the frequency comprises a plurality of preset scanning frequencies and a plurality of corresponding preset backlight brightness, wherein the value of the preset backlight brightness corresponding to the lower preset scanning frequency is smaller than that of the preset backlight brightness corresponding to the higher preset scanning frequency.

In an exemplary embodiment, the timing controller 110 may pre-store the preset correspondence between the luminance and the frequency in advance, for example, a memory may be provided in the timing controller 110 to store the preset correspondence between the luminance and the frequency.

step S111 may include step S111-1: the time sequence controller searches a preset brightness value corresponding to the average value of the backlight brightness, and takes a preset scanning frequency corresponding to the searched preset brightness value as the backlight scanning frequency.

the step S111-1 may include: the time sequence controller searches a value range of a preset brightness value corresponding to the brightness value of the backlight, and takes a preset scanning frequency corresponding to the value range of the searched preset brightness value as a backlight scanning frequency.

In an exemplary embodiment, a correspondence table between preset brightness values and preset scan frequencies may refer to table 1, in which values of preset brightness values c (1) to c (n) are sequentially increased, values of preset scan frequencies s (1) to s (n) are sequentially increased, for example, a minimum preset scan frequency s (1) may be set to 120Hz, a maximum preset scan s (n) may be set to 21kHz, a preset brightness value may be a brightness percentage, for example, a preset brightness value c (1) may be set to 20%, a preset brightness value c (n) may be set to 80%, and a theoretical maximum value of the preset brightness value may be set to 90% or 100%.

In an exemplary embodiment, the backlight luminance data may include backlight luminance values, and the plurality of preset backlight luminances include preset maximum backlight luminance values, preset minimum backlight luminance values; the plurality of preset scanning frequencies comprise preset maximum backlight scanning frequencies and preset minimum backlight scanning frequencies; in the corresponding relation between the preset brightness and the frequency, the preset maximum backlight brightness value corresponds to the preset maximum backlight scanning frequency, and the preset minimum backlight brightness value corresponds to the preset minimum backlight scanning frequency; the step S111 may include:

When the backlight brightness value is smaller than or equal to a preset minimum backlight brightness value, the time sequence controller takes the preset minimum backlight scanning frequency as the backlight scanning frequency;

when the backlight brightness value is larger than or equal to the preset maximum backlight brightness value, the time sequence controller takes the preset maximum backlight scanning frequency as the backlight scanning frequency;

and under the condition that the backlight brightness value is larger than the preset minimum backlight brightness value and smaller than the preset maximum backlight brightness value, the time sequence controller calculates the backlight scanning frequency according to the preset maximum backlight brightness value, the preset minimum backlight brightness value, the preset maximum backlight scanning frequency and the preset minimum backlight scanning frequency.

In an exemplary embodiment, in the case that the backlight luminance value is greater than a preset minimum backlight luminance value and less than a preset maximum backlight luminance value, the timing controller calculates the backlight scanning frequency according to the following formula (i.e., calculates the backlight scanning frequency using interpolation):

In an exemplary embodiment, in the scheme in which the timing controller 110 calculates the preset scan frequency using interpolation, the preset luminance value and preset scan frequency correspondence table may refer to table 2, in which table 2, the preset luminance value may be a luminance percentage, for example, the preset minimum backlight luminance value bmin may be set to 20%, the preset maximum backlight luminance average bmax may be set to 80%, and the theoretical maximum value of the preset luminance value may be set to 100% or 90%; the value of the preset minimum backlight scanning frequency fmin may be set to 120Hz and the value of the preset maximum backlight scanning frequency fmax may be set to 21kHz.

In an exemplary embodiment, as shown in fig. 2, the timing controller 110 may be electrically connected to the external system 10, and the timing controller acquiring backlight brightness data in step S11 may include: the timing controller 110 may acquire image data from the external system 10 and calculate a backlight luminance value from the image data. For example, the timing controller 110 may acquire image data from the external system 10, calculate the duty ratio of the pulse width modulation signal according to the image data, that is, after the external system 10 sends the image data to the timing controller 110, the timing controller 110 acquires all pulse width modulation signals (including the pulse width modulation high level signal and the pulse width modulation low level signal) according to the image data, and calculate the duty ratio of the pulse width modulation high level signal in all pulse width modulation signals, so as to obtain the duty ratio of the pulse width modulation signal.

In an exemplary embodiment, the timing controller acquiring the backlight brightness data in step S11 may include: the timing controller 110 acquires a backlight luminance value from the external system 10. For example, the timing controller 110 may acquire the pulse width modulation signal duty ratio from the external system 10, i.e., the external system 10 directly transmits the pulse width modulation signal duty ratio (i.e., the duty ratio of the pulse width modulation high level signal) to the timing controller 110, without the timing controller 110 calculating the pulse width modulation signal duty ratio from the image data.

In an exemplary embodiment, the timing controller acquiring the backlight brightness data in step S11 may include: the timing controller 110 obtains a plurality of backlight luminance values corresponding to the plurality of backlight partitions, calculates a backlight luminance average value of the plurality of backlight partitions according to the plurality of backlight luminance values corresponding to the plurality of backlight partitions, and takes the backlight luminance average value as the backlight luminance value; in an exemplary embodiment, the backlight luminance average for all backlight partitions may be calculated by the following formula:

In an exemplary embodiment, the timing controller acquiring the backlight brightness data in step S11 may include: the timing controller 110 obtains a plurality of backlight luminance values corresponding to the plurality of backlight partitions, respectively, obtains a maximum backlight luminance value from the plurality of backlight luminance values corresponding to the plurality of backlight partitions, and uses the maximum backlight luminance value as the backlight luminance value.

In an exemplary embodiment, as shown in fig. 11, the backlight driving method may include:

step S21: the time sequence controller acquires backlight brightness data and sends the backlight brightness data to the backlight driving circuit;

step S22: the backlight driving circuit obtains corresponding backlight scanning frequency according to the backlight brightness data and drives the backlight plate to emit light according to the backlight brightness data and the backlight scanning frequency; wherein the backlight brightness data corresponding to low brightness corresponds to a lower backlight scanning frequency.

In an exemplary embodiment, the backlight panel includes at least one backlight partition, the backlight driving circuit includes at least one backlight driving chip, the backlight driving chips are electrically connected to the timing controller, and each backlight partition is electrically connected to one of the backlight driving chips;

Step S21 may include: the time sequence controller acquires backlight brightness data corresponding to at least one backlight partition, and sends the backlight brightness data corresponding to the at least one backlight partition to a corresponding backlight driving chip;

step S22 may include: the backlight driving chip obtains the corresponding backlight scanning frequency according to the backlight brightness data sent by the time sequence controller, and drives the corresponding backlight partition to emit light according to the backlight brightness data and the backlight scanning frequency.

In an exemplary embodiment, the backlight driving chip in step S22 obtains a corresponding backlight scanning frequency according to the backlight brightness data, and may include step S221: the backlight driving chip obtains the corresponding backlight scanning frequency according to the preset corresponding relation between the brightness and the frequency and the backlight brightness data; the corresponding relation between the preset brightness and the frequency comprises a plurality of preset scanning frequencies and a plurality of corresponding preset backlight brightness, wherein the value of the preset backlight brightness corresponding to the lower preset scanning frequency is smaller than that of the preset backlight brightness corresponding to the higher preset scanning frequency.

In an exemplary embodiment, the preset correspondence between luminance and frequency may be pre-stored in the backlight driving chip, for example, a memory may be provided in the backlight driving chip to store the preset correspondence between luminance and frequency.

step S221 may include step S221-1: the backlight driving chip searches a preset brightness value corresponding to the average value of the backlight brightness, and takes a preset scanning frequency corresponding to the searched preset brightness value as the backlight scanning frequency.

the step S221-1 may include: the backlight driving chip searches a value range of a preset brightness value corresponding to the backlight brightness value, and takes a preset scanning frequency corresponding to the value range of the searched preset brightness value as a backlight scanning frequency.

In an exemplary embodiment, the backlight luminance data may include backlight luminance values, and the plurality of preset backlight luminances include preset maximum backlight luminance values, preset minimum backlight luminance values; the plurality of preset scanning frequencies comprise preset maximum backlight scanning frequencies and preset minimum backlight scanning frequencies; in the corresponding relation between the preset brightness and the frequency, the preset maximum backlight brightness value corresponds to the preset maximum backlight scanning frequency, and the preset minimum backlight brightness value corresponds to the preset minimum backlight scanning frequency; the step S221 may include:

when the backlight brightness value is smaller than or equal to the preset minimum backlight brightness value, the backlight driving chip takes the preset minimum backlight scanning frequency as the backlight scanning frequency;

when the backlight brightness value is larger than or equal to the preset maximum backlight brightness value, the backlight driving chip takes the preset maximum backlight scanning frequency as the backlight scanning frequency;

and under the condition that the backlight brightness value is larger than the preset minimum backlight brightness value and smaller than the preset maximum backlight brightness value, the backlight driving chip calculates the backlight scanning frequency according to the preset maximum backlight brightness value, the preset minimum backlight brightness value, the preset maximum backlight scanning frequency and the preset minimum backlight scanning frequency.

In an exemplary embodiment, in the case that the backlight luminance value is greater than a preset minimum backlight luminance value and less than a preset maximum backlight luminance value, the backlight driving chip calculates the backlight scanning frequency according to the following formula (i.e., calculates the backlight scanning frequency using interpolation):

In an exemplary embodiment, in a scheme in which the backlight driving chip calculates the preset scan frequency using interpolation, a table of correspondence between preset luminance values and preset scan frequencies may be referred to as table 2, and in table 2, the preset luminance values may be percentages of luminance, for example, a preset minimum backlight luminance value bmin may be set to 20%, a preset maximum backlight luminance average value bmax may be set to 80%, and a theoretical maximum value of the preset luminance values may be set to 100% or 90%; the value of the preset minimum backlight scanning frequency fmin may be set to 120Hz and the value of the preset maximum backlight scanning frequency fmax may be set to 21kHz.

In an exemplary embodiment, as shown in fig. 2, the timing controller 110 may be electrically connected to the external system 10, and the timing controller acquiring backlight brightness data in step S21 may include: the timing controller 110 may acquire image data from the external system 10 and calculate a backlight luminance value from the image data. For example, the timing controller 110 may acquire image data from the external system 10, calculate the duty ratio of the pulse width modulation signal according to the image data, that is, after the external system 10 sends the image data to the timing controller 110, the timing controller 110 acquires all pulse width modulation signals (including the pulse width modulation high level signal and the pulse width modulation low level signal) according to the image data, and calculate the duty ratio of the pulse width modulation high level signal in all pulse width modulation signals, so as to obtain the duty ratio of the pulse width modulation signal.

In an exemplary embodiment, the timing controller acquiring the backlight brightness data in step S21 may include: the timing controller 110 acquires a backlight luminance value from the external system 10. For example, the timing controller 110 may acquire the pulse width modulation signal duty ratio from the external system 10, i.e., the external system 10 directly transmits the pulse width modulation signal duty ratio (i.e., the duty ratio of the pulse width modulation high level signal) to the timing controller 110, without the timing controller 110 calculating the pulse width modulation signal duty ratio from the image data.

In an exemplary embodiment, the timing controller acquiring the backlight brightness data in step S21 may include: the timing controller 110 obtains a plurality of backlight luminance values corresponding to the plurality of backlight partitions, calculates a backlight luminance average value of the plurality of backlight partitions according to the plurality of backlight luminance values corresponding to the plurality of backlight partitions, and takes the backlight luminance average value as the backlight luminance value; in an exemplary embodiment, the backlight luminance average for all backlight partitions may be calculated by the following formula:

In an exemplary embodiment, the timing controller acquiring the backlight brightness data in step S21 may include: the timing controller 110 obtains a plurality of backlight luminance values corresponding to the plurality of backlight partitions, respectively, obtains a maximum backlight luminance value from the plurality of backlight luminance values corresponding to the plurality of backlight partitions, and uses the maximum backlight luminance value as the backlight luminance value.

The drawings in the present disclosure relate only to structures to which embodiments of the present disclosure relate, and other structures may be referred to as general designs.

Features of embodiments of the present disclosure, i.e., embodiments, may be combined with one another to arrive at a new embodiment without conflict.

While the embodiments disclosed in the examples of the present disclosure are described above, the disclosure is merely an implementation manner for facilitating understanding of the examples of the present disclosure, and is not intended to limit the examples of the present disclosure. Any person skilled in the art to which the embodiments of the present disclosure pertains may make any modification and variation in form and detail of implementation without departing from the spirit and scope of the embodiments of the present disclosure, but the scope of the embodiments of the present disclosure shall be subject to the scope of the appended claims.

Claims

1. The backlight driving device is characterized by comprising a time sequence controller and a backlight driving circuit, wherein the time sequence controller is electrically connected with the backlight driving circuit, and the backlight driving circuit is electrically connected with a backlight plate;

2. A backlight driving apparatus according to claim 1, wherein the acquiring the corresponding backlight scanning frequency according to the backlight luminance data comprises: acquiring the corresponding backlight scanning frequency according to the preset corresponding relation between the brightness and the frequency and the backlight brightness data; the corresponding relation between the preset brightness and the frequency comprises a plurality of preset scanning frequencies and a plurality of corresponding preset backlight brightness, wherein the value of the preset backlight brightness corresponding to the lower preset scanning frequency is smaller than that of the preset backlight brightness corresponding to the higher preset scanning frequency.

3. The backlight driving apparatus according to claim 2, wherein the backlight luminance data includes backlight luminance values, the plurality of preset backlight luminances includes a plurality of preset luminance values, and each preset luminance value corresponds to one of preset scanning frequencies in a correspondence relationship between the preset luminance and the frequency;

4. A backlight driving apparatus according to claim 3, wherein the plurality of preset backlight luminances include a plurality of preset luminance value range divided by the plurality of preset luminance values, and in the preset luminance-frequency correspondence, each preset luminance value range corresponds to one of the preset scanning frequencies;

5. A backlight driving device according to claim 2, wherein the backlight luminance data comprises backlight luminance values, and the plurality of preset backlight luminances comprises preset maximum backlight luminance values and preset minimum backlight luminance values; the plurality of preset scanning frequencies comprise preset maximum backlight scanning frequency and preset minimum backlight scanning frequency; in the corresponding relation between the preset brightness and the frequency, the preset maximum backlight brightness value corresponds to the preset maximum backlight scanning frequency, and the preset minimum backlight brightness value corresponds to the preset minimum backlight scanning frequency; the obtaining the corresponding backlight scanning frequency according to the preset corresponding relation between the brightness and the frequency and the backlight brightness data comprises the following steps:

6. A backlight driving device according to claim 5, wherein in case the luminance value of the backlight partition is larger than the preset minimum backlight luminance value and smaller than the preset maximum backlight luminance value, the backlight scanning frequency is calculated according to the following formula:

7. A backlight driving device according to any one of claims 3 to 6, wherein the backlight brightness value comprises a pulse width modulated signal duty cycle and the preset brightness value comprises a preset pulse width modulated signal duty cycle.

8. A backlight driving apparatus according to any one of claims 3 to 6, wherein the acquiring backlight luminance data comprises: the timing controller is configured to acquire the backlight luminance value from an external system.

9. A backlight driving apparatus according to any one of claims 3 to 6, wherein the acquiring backlight luminance data comprises: the timing controller is configured to acquire image data from an external system and calculate the backlight luminance value based on the image data.

10. A backlight driving apparatus according to any one of claims 3 to 6, wherein the backlight plate comprises a plurality of backlight partitions;

11. A backlight driving device according to any one of claims 1 to 6, wherein the backlight panel comprises at least one backlight section, the backlight driving circuit comprises at least one backlight driving chip, the backlight driving chip is electrically connected to the timing controller, and each of the backlight sections is electrically connected to one of the backlight driving chips;

12. A backlight driving device according to any one of claims 1 to 6, wherein the backlight panel comprises at least one backlight section, the backlight driving circuit comprises at least one backlight driving chip, the backlight driving chip is electrically connected to the timing controller, and each of the backlight sections is electrically connected to one of the backlight driving chips;

13. A display device comprising a backlight driving device according to any one of claims 1 to 12.

14. A backlight driving method, characterized in that it is applied to the backlight driving device according to any one of claims 1 to 12, the backlight driving device comprising a timing controller and a backlight driving circuit, the timing controller being electrically connected to the backlight driving circuit, the backlight driving circuit being electrically connected to a backlight panel; the backlight driving method includes:

15. The backlight driving method according to claim 14, wherein the backlight board comprises at least one backlight partition, the backlight driving circuit comprises at least one backlight driving chip, the backlight driving chip is electrically connected with the timing controller, and each backlight partition is electrically connected with one of the backlight driving chips;

16. A backlight driving method according to claim 14 or 15, wherein the obtaining the corresponding backlight scanning frequency according to the backlight luminance data comprises: acquiring the corresponding backlight scanning frequency according to the preset corresponding relation between the brightness and the frequency and the backlight brightness data; the corresponding relation between the preset brightness and the frequency comprises a plurality of preset scanning frequencies and a plurality of corresponding preset backlight brightness, wherein the value of the preset backlight brightness corresponding to the lower preset scanning frequency is smaller than that of the preset backlight brightness corresponding to the higher preset scanning frequency.

17. A backlight driving method, characterized in that it is applied to the backlight driving device according to any one of claims 1 to 12, the backlight driving device comprising a timing controller and a backlight driving circuit, the timing controller being electrically connected to the backlight driving circuit, the backlight driving circuit being electrically connected to a backlight panel; the backlight driving method includes:

18. The backlight driving method according to claim 17, wherein the backlight board comprises at least one backlight partition, the backlight driving circuit comprises at least one backlight driving chip, the backlight driving chips are electrically connected with the timing controller, and each backlight partition is electrically connected with one of the backlight driving chips;

19. A backlight driving method according to claim 17 or 18, wherein the obtaining the corresponding backlight scanning frequency according to the backlight luminance data comprises: acquiring the corresponding backlight scanning frequency according to the preset corresponding relation between the brightness and the frequency and the backlight brightness data; the corresponding relation between the preset brightness and the frequency comprises a plurality of preset scanning frequencies and a plurality of corresponding preset backlight brightness, wherein the value of the preset backlight brightness corresponding to the lower preset scanning frequency is smaller than that of the preset backlight brightness corresponding to the higher preset scanning frequency.