Backlight driving method and device, display device, electronic device and storage medium

Abstract

The present disclosure provides a backlight driving method, a backlight driving device, a display device, an electronic device and a non-transitory computer-readable storage medium. The backlight driving method includes: obtaining the refresh rate of the frame to be displayed and the parameters of the liquid crystal panel; determining the black insertion ratio of the frame to be displayed according to the refresh rate of the frame to be displayed and the parameters of the liquid crystal panel; determining the frequency multiplication information of the frame to be displayed according to the refresh rate of the frame to be displayed and the black insertion ratio of the frame to be displayed; determining the backlight sub-frame black insertion time of the frame to be displayed according to the refresh rate of the frame to be displayed, the black insertion ratio of the frame to be displayed and the frequency multiplication information of the frame to be displayed; providing a backlight driving signal to the backlight module according to the frequency multiplication information of the frame to be displayed and the backlight sub-frame black insertion time of the frame to be displayed. The backlight driving method disclosed in the present disclosure is adopted so that there is no delay between the backlight refresh rate and the panel refresh rate.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a backlight driving method, a backlight driving device, a display device, an electronic device, and a non-transitory computer-readable storage medium. Background Art

[0002] With the continuous development of display technology, users' requirements for display devices are gradually increasing. Dynamic image response time is a parameter that requires attention. The shorter the dynamic image response time, the clearer the image and the less ghosting.

[0003] In order to shorten the response time of dynamic images, the method of inserting black frames is usually used to reduce the display time of each frame. However, black frame insertion usually collects the refresh rate of the previous frame signal and operates on the next frame signal, which causes a problem of mismatch between the backlight refresh rate and the panel refresh rate. Summary of the Invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art, and proposes a backlight driving method, a backlight driving device, a display device, an electronic device, and a non-transitory computer-readable storage medium.

[0005] In order to achieve the above object, according to one aspect of the present disclosure, a backlight driving method is provided, characterized by comprising:

[0006] Obtain the refresh rate of the frame to be displayed and the parameters of the LCD panel;

[0007] determining a black insertion ratio of the frame to be displayed according to a refresh rate of the frame to be displayed and parameters of the liquid crystal panel;

[0008] determining frequency multiplication information of the frame to be displayed according to the refresh rate of the frame to be displayed and the black insertion ratio of the frame to be displayed;

[0009] Determining a backlight sub-frame black insertion time of the frame to be displayed according to a refresh rate of the frame to be displayed, a black insertion ratio of the frame to be displayed, and frequency multiplication information of the frame to be displayed;

[0010] A backlight driving signal is provided for the backlight module according to the frequency doubling information of the frame to be displayed and the backlight sub-frame black insertion time of the frame to be displayed.

[0011] In some optional embodiments, the step of determining the black insertion ratio of the frame to be displayed according to the refresh rate of the frame to be displayed and the parameters of the liquid crystal panel includes:

[0012] Determining the frame duration of the frame to be displayed according to the refresh rate of the frame to be displayed;

[0013] Obtain the number of backlight black insertion partitions, vertical blanking time of the LCD panel, and LCD response time;

[0014] Determining a minimum black insertion duration of the frame to be displayed according to the number of the backlight black insertion partitions, the vertical blanking time of the liquid crystal panel, the response time of the liquid crystal, and the frame duration of the frame to be displayed;

[0015] The black insertion ratio of the frame to be displayed is determined according to the minimum black insertion duration of the frame to be displayed and the frame duration of the frame to be displayed.

[0016] In some optional embodiments, the step of determining the minimum black insertion duration of the frame to be displayed based on the number of the backlight black insertion partitions, the vertical blanking time of the liquid crystal panel, the response time of the liquid crystal, and the frame duration of the frame to be displayed includes:

[0017] Determine the minimum black insertion time of the frame to be displayed according to formula (1);

[0018]

[0019] Among them, Ts is the minimum black insertion time of the frame to be displayed, Tf is the frame length of the frame to be displayed, Tvb is the vertical blanking time of the LCD panel, Tr is the response time of the liquid crystal, and n is the number of backlight black insertion partitions.

[0020] In some optional embodiments, the step of determining the black insertion ratio of the frame to be displayed according to the minimum black insertion duration of the frame to be displayed and the frame duration of the frame to be displayed includes:

[0021] Determine the black insertion ratio of the frame to be displayed according to formula (2);

[0022]

[0023] Wherein, Ts is the minimum black insertion time of the frame to be displayed, Tf is the frame time of the frame to be displayed, X is the black insertion ratio of the frame to be displayed, and Tb is a constant greater than 0 and less than Tf-Ts.

[0024] In some optional embodiments, the step of determining the black insertion ratio of the frame to be displayed according to the minimum black insertion duration of the frame to be displayed and the frame duration of the frame to be displayed further includes:

[0025] Get the maximum response time of dynamic images;

[0026] Set the constant Tb to a preset value;

[0027] Determine the dynamic picture response time of the frame to be displayed according to formula (3) and the preset value;

[0028]

[0029] Among them, MPRT is the dynamic picture response time of the frame to be displayed;

[0030] Determine whether the dynamic picture response time of the frame to be displayed is greater than the maximum dynamic picture response time. If the dynamic picture response time of the frame to be displayed is greater than the maximum dynamic picture response time, adjust the constant Tb to correct the black insertion ratio; if the dynamic picture response time of the frame to be displayed is less than the maximum dynamic picture response time, the constant Tb remains at the preset value.

[0031] In some optional embodiments, the step of determining the frequency multiplication information of the frame to be displayed according to the refresh rate of the frame to be displayed and the black insertion ratio of the frame to be displayed includes:

[0032] Determining a backlight frequency multiplication factor of the frame to be displayed according to the refresh rate of the frame to be displayed;

[0033] determining a current compensation multiple of the frame to be displayed according to the black insertion ratio of the frame to be displayed;

[0034] The frequency multiplication information of the frame to be displayed includes a backlight frequency multiplication factor of the frame to be displayed and a current compensation factor of the frame to be displayed.

[0035] In some optional embodiments, the step of determining the backlight frequency multiplication factor of the frame to be displayed according to the refresh rate of the frame to be displayed includes:

[0036] Acquire multiple preset refresh rate ranges, each of the preset refresh rate ranges corresponds to a frequency multiplier, and different preset refresh rate ranges correspond to different frequency multipliers;

[0037] Matching the refresh rate of the frame to be displayed with a plurality of preset refresh rate ranges, and using the frequency multiplier corresponding to the matched preset refresh rate range as the backlight frequency multiplier of the frame to be displayed;

[0038] Among them, the larger the minimum value of the preset refresh rate range is, the smaller the corresponding multiplier is.

[0039] In some optional embodiments, the step of determining the current compensation multiple of the frame to be displayed according to the black insertion ratio of the frame to be displayed includes:

[0040] Determine the current compensation multiple of the frame to be displayed according to formula (4);

[0041]

[0042] Wherein, A is the current compensation multiple of the frame to be displayed, and A is less than or equal to the maximum current compensation multiple, and X is the black insertion ratio of the frame to be displayed.

[0043] In some optional embodiments, the step of determining the backlight sub-frame black insertion time of the frame to be displayed based on the refresh rate of the frame to be displayed, the black insertion ratio of the frame to be displayed and the frequency multiplication information of the frame to be displayed includes: determining the backlight sub-frame black insertion time of the frame to be displayed based on the backlight frequency multiplication multiple of the frame to be displayed, the frame length of the frame to be displayed and the black insertion ratio of the frame to be displayed.

[0044] In some optional embodiments, the step of determining the backlight sub-frame black insertion time of the frame to be displayed according to the backlight frequency multiplication factor of the frame to be displayed, the frame duration of the frame to be displayed, and the black insertion ratio of the frame to be displayed includes:

[0045] Determine the backlight sub-frame black insertion time of the frame to be displayed according to formula (5);

[0046]

[0047] Among them, Y is the backlight sub-frame black insertion time of the frame to be displayed, m is the backlight frequency multiplier of the frame to be displayed, Tf is the frame length of the frame to be displayed, and X is the black insertion ratio of the frame to be displayed.

[0048] According to another aspect of the present disclosure, there is provided a backlight driving device, comprising:

[0049] an acquisition module configured to acquire a refresh rate of a frame to be displayed and parameters of a liquid crystal panel;

[0050] a processing module configured to determine a black insertion ratio of the frame to be displayed according to a refresh rate of the frame to be displayed and parameters of the liquid crystal panel;

[0051] The processing module is further configured to determine frequency multiplication information of the frame to be displayed according to the refresh rate of the frame to be displayed and the black insertion ratio of the frame to be displayed;

[0052] The processing module is further configured to determine a backlight sub-frame black insertion time of the frame to be displayed according to the refresh rate of the frame to be displayed, the black insertion ratio of the frame to be displayed, and the frequency multiplication information of the frame to be displayed;

[0053] The processing module is further configured to provide a backlight driving signal for the backlight module according to the refresh rate of the frame to be displayed, the frequency multiplication information of the frame to be displayed, and the backlight sub-frame black insertion time of the frame to be displayed.

[0054] According to another aspect of the present disclosure, a display device is provided, comprising a backlight module and the above-mentioned backlight driving device, wherein the backlight driving device provides a backlight driving signal for the backlight module.

[0055] According to another aspect of the present disclosure, an electronic device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the above-mentioned backlight driving method is implemented.

[0056] According to another aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned backlight driving method is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0058] Figure 1 A flowchart of a backlight driving method according to an optional embodiment of the present disclosure is shown;

[0059] Figure 2 A flow chart showing a backlight driving method according to another optional embodiment of the present disclosure is shown;

[0060] Figure 3 A schematic diagram of signal black insertion in an optional embodiment of the present disclosure is shown;

[0061] Figure 4 A schematic diagram of signal black insertion in another optional embodiment of the present disclosure is shown;

[0062] Figure 5 A schematic diagram of signal black insertion in another optional embodiment of the present disclosure is shown;

[0063] Figure 6 A schematic diagram of signal transmission in an optional embodiment of the present disclosure is shown;

[0064] Figure 7 A schematic structural diagram of an electronic device according to an optional embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0065] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0066] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0067] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should have the usual meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0068] As used herein, "parallel" and "perpendicular" include the conditions described and conditions similar to the conditions described, and the range of the similar conditions is within an acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range for approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range for approximate perpendicularity can also be, for example, a deviation within 5°.

[0069] It will be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present therebetween.

[0070] Exemplary embodiments are described herein with reference to cross-sectional and / or plan views that are idealized exemplary drawings. In the drawings, the thicknesses of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include deviations in shape due to, for example, manufacturing. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0071] Dynamic image response time is a parameter of particular concern for display devices. The shorter the dynamic image response time, the clearer the image and the less smearing. Black frame insertion is typically used to reduce the display time of each frame. However, this shortens the backlight on-time, reducing image brightness. Furthermore, enabling black frame insertion switches the display device to PWM (Pulse-Width Modulation) dimming, causing visible backlight flicker at low grayscale levels.

[0072] In related technologies, a display device typically provides backlight for the next frame based on the refresh rate of the current frame. This results in a mismatch between the backlight refresh rate of the current frame and the refresh rate of the LCD panel, with a time difference of one frame between the two. For example, if the refresh rate of the current frame is 60 Hz and the refresh rate of the next frame is 120 Hz, the display device will provide a 60 Hz backlight refresh rate and a 120 Hz LCD panel refresh rate for the next frame. This mismatch results in poor display quality.

[0073] Figure 1 A flowchart of a backlight driving method according to an optional embodiment of the present disclosure is shown; Figure 2 A flow chart showing a backlight driving method according to another optional embodiment of the present disclosure is shown; Figure 3 A schematic diagram of signal black insertion in an optional embodiment of the present disclosure is shown; Figure 4 A schematic diagram of signal black insertion in another optional embodiment of the present disclosure is shown; Figure 5 A schematic diagram of signal black insertion in another optional embodiment of the present disclosure is shown; Figure 6 A schematic diagram of signal transmission in an optional embodiment of the present disclosure is shown; Figure 7 A schematic structural diagram of an electronic device according to an optional embodiment of the present disclosure is shown.

[0074] The first aspect, such as Figure 1 As shown, the present disclosure provides a backlight driving method, which includes steps S10 to S50.

[0075] Step S10: Obtain the refresh rate of the frame to be displayed and the parameters of the LCD panel. By obtaining the refresh rate of the frame to be displayed and providing the backlight with a backlight driving signal for the frame to be displayed, the backlight refresh rate can be matched with the LCD panel refresh rate to improve the display effect.

[0076] It should be noted that the matching of the backlight refresh rate and the LCD panel refresh rate means that the refresh rates of the two are consistent.

[0077] Step S20 : ​​determining a black insertion ratio of the frame to be displayed according to the refresh rate of the frame to be displayed and parameters of the liquid crystal panel.

[0078] In some optional embodiments, the black insertion ratio of each frame can be adjusted according to the refresh rate of the frame. For example, step S20 includes steps S21 to S24.

[0079] Step S21: Determine the frame duration of the frame to be displayed according to the refresh rate of the frame to be displayed. The frame duration of the frame to be displayed is the inverse of the refresh rate of the frame to be displayed. For example, if the refresh rate of the frame to be displayed is 60 Hz, the duration of the frame to be displayed is 16.67 ms.

[0080] Step S22: Obtain the number of backlight black insertion partitions, the vertical blanking time of the liquid crystal panel, and the response time of the liquid crystal. The parameters of the liquid crystal panel include the vertical blanking time of the liquid crystal panel and the response time of the liquid crystal.

[0081] Step S23 : determining a minimum black insertion duration of the frame to be displayed according to the number of backlight black insertion partitions, the vertical blanking time of the liquid crystal panel, the response time of the liquid crystal, and the frame duration of the frame to be displayed.

[0082] In some optional embodiments, step S23 includes determining the minimum black insertion time of the frame to be displayed according to formula (1);

[0083]

[0084] Where Ts is the minimum black insertion duration of the frame to be displayed, Tf is the frame duration of the frame to be displayed, Tvb is the vertical blanking time of the LCD panel, Tr is the response time of the LCD, and n is the number of backlight black insertion zones. In a single display device, the number of backlight black insertion zones, the vertical blanking time of the LCD panel, and the response time of the LCD are all fixed values. The minimum black insertion duration of the frame to be displayed is related to the frame duration of the frame to be displayed.

[0085] Step S24: Determine the black insertion ratio of the frame to be displayed according to the minimum black insertion duration of the frame to be displayed and the frame duration of the frame to be displayed. Step S24 specifically includes steps S241 and S245:

[0086] Step S241: determining the black insertion ratio of the frame to be displayed according to formula (2);

[0087]

[0088] Wherein, Ts is the minimum black insertion time of the frame to be displayed, Tf is the frame time of the frame to be displayed, X is the black insertion ratio of the frame to be displayed, and Tb is a constant greater than 0 and less than Tf-Ts.

[0089] Ts+Tb is the total black insertion time of the frame to be displayed. The longer the total black insertion time, the better the display effect. However, if the total black insertion time is too long, it will affect the dynamic picture response time. Therefore, the constant Tb will be limited to a range.

[0090] Step S242: Obtain the maximum dynamic image response time. For example, the maximum dynamic image response time is 1ms. That is, a dynamic image response time less than 1ms will have a good display effect. Of course, in some other embodiments, the maximum dynamic image response time can be other values, such as 3ms, 5ms, etc., and can be designed according to the specific usage requirements of the display device, and is not specifically limited here.

[0091] Step S243, setting the constant Tb to a preset value;

[0092] Step S244: determining the dynamic picture response time of the frame to be displayed according to formula (3) and a preset value;

[0093]

[0094] Among them, MPRT is the dynamic picture response time of the frame to be displayed;

[0095] Step S245: Determine whether the dynamic picture response time of the frame to be displayed is greater than the maximum dynamic picture response time. If the dynamic picture response time of the frame to be displayed is greater than the maximum dynamic picture response time, adjust the constant Tb to correct the black insertion ratio until the dynamic picture response time of the frame to be displayed is less than the maximum dynamic picture response time; if the dynamic picture response time of the frame to be displayed is less than the maximum dynamic picture response time, the constant Tb remains at the preset value.

[0096] In other optional embodiments, the black insertion ratio of each frame in the display device is the same, that is, the black insertion ratio can be a fixed value, and it is only necessary to ensure that the dynamic picture response time is less than the maximum dynamic picture response time under various refresh rates under this fixed value to ensure the display effect of the display device. When the black insertion ratio in the display device is a fixed value, the black insertion ratio can still be determined by formulas (1) to (3), and it is only necessary to ensure that the dynamic picture response time corresponding to the maximum refresh rate and the minimum refresh rate of the display device is less than the maximum dynamic picture response time.

[0097] Step S30: Determine the frequency multiplication information of the frame to be displayed based on the refresh rate of the frame to be displayed and the black insertion ratio of the frame to be displayed. The frequency multiplication information of the frame to be displayed includes the backlight frequency multiplication factor of the frame to be displayed and the current compensation factor of the frame to be displayed. Step S30 includes the following steps S31 and S32.

[0098] Step S31: Determine the backlight frequency multiplier for the frame to be displayed based on the refresh rate of the frame to be displayed. When black frame insertion mode is enabled, the display device switches to PWM dimming. When the refresh rate is too low, backlight flicker is perceptible to the human eye. To avoid backlight flicker at low refresh rates, backlight frequency multiplication is required. Step S31 includes the following steps: S311 and S312.

[0099] Step S311: Acquire multiple preset refresh rate ranges, each preset refresh rate range corresponds to a frequency multiplier, and different preset refresh rate ranges correspond to different frequency multipliers.

[0100] Step S312: Match the refresh rate of the frame to be displayed with a plurality of preset refresh rate ranges, and use the frequency multiplier corresponding to the matched preset refresh rate range as the backlight frequency multiplier of the frame to be displayed.

[0101] The larger the minimum value of the preset refresh rate range is, the smaller the corresponding frequency multiplier is. In other words, the smaller the refresh rate of the frame to be displayed is, the larger the backlight frequency multiplier is. For example, see Figure 2 , there are three preset refresh rate ranges, which are the first preset refresh rate range, the second preset refresh rate range and the third preset refresh rate range. First, determine whether the refresh rate of the frame to be displayed is within the first preset refresh rate range. If it is within the first preset refresh rate range, the backlight frequency multiplier is the first multiple. If the refresh rate of the frame to be displayed is not within the first preset refresh rate range, then determine whether the refresh rate of the frame to be displayed is within the second preset refresh rate range. If it is within the second preset refresh rate range, the backlight frequency multiplier is the second multiple. If the refresh rate of the frame to be displayed is not within the second preset refresh rate range, then determine that the refresh rate of the frame to be displayed is within the third preset refresh rate range, and the backlight frequency multiplier is the third multiple. Of course, other methods can also be used to determine which preset refresh rate range the refresh rate of the frame to be displayed is within, and no specific restrictions are made here. Of course, the preset refresh rate range can also be other numbers. Three are just used as an example here, and the specific number is not specifically limited.

[0102] Step S32, determine the current compensation multiple of the frame to be displayed according to the black insertion ratio. During black insertion, because the light-emitting device's light-emitting time becomes shorter, the brightness will drop sharply when the current remains unchanged. At this time, the brightness can be ensured not to decrease by increasing the current of the light-emitting device. Therefore, the display brightness can be improved by doubling the current of the light-emitting device. The current compensation multiple of the frame to be displayed is the multiple of the current multiplied for the frame to be displayed. During the partition scanning process, by increasing the current of the backlight black insertion partition, the average current does not decrease and the brightness does not decrease during black insertion. At the same time, due to the partition scanning, the total instantaneous power consumption of the backlight is not increased. It should be noted that during partition scanning, when a backlight black insertion partition is lit, the current of the backlight black insertion partition is increased.

[0103] It should be noted that if the display device does not have a black insertion function, each backlight black insertion zone has a basic current. However, when the display device has a black insertion function, the lighting time of each backlight black insertion zone will be reduced. Therefore, when the backlight black insertion zone is lit, its current is increased, and the current compensation multiplier is the multiple of its basic current.

[0104] Specifically, step S32 includes determining the current compensation multiple of the frame to be displayed according to formula (4);

[0105]

[0106] Where A is the current compensation factor for the frame to be displayed, and A is less than or equal to the maximum current compensation factor. X is the black insertion ratio for the frame to be displayed. The current compensation factor and the black insertion ratio are interrelated. However, the display device has a maximum current compensation factor. Therefore, it is sufficient to ensure that the current compensation factor for the frame to be displayed is less than or equal to the maximum current compensation factor.

[0107] That is to say, when determining the black insertion ratio, it is necessary to consider the impact of the black insertion ratio on the maximum current compensation multiple and the maximum response time of the dynamic picture. The larger the black insertion ratio, the longer the total black insertion time and the shorter the dynamic picture response time, the better the visual effect. However, the longer the total black insertion time, the greater the brightness drop. In order to ensure that the brightness does not decrease, the current needs to be increased. The current compensation multiple is inversely proportional to the black insertion ratio. Due to the limitations of chip and circuit design, the current compensation multiple needs to be less than or equal to the maximum current compensation multiple. Therefore, it is necessary to find a suitable black insertion ratio to ensure that the dynamic picture response time is less than the maximum response time of the dynamic picture, and that the current does not exceed the standard.

[0108] Step S40 : determining the backlight sub-frame black insertion time of the frame to be displayed according to the refresh rate of the frame to be displayed, the black insertion ratio of the frame to be displayed, and the frequency multiplication information of the frame to be displayed.

[0109] Specifically, step S40 includes determining the backlight sub-frame black insertion time of the frame to be displayed according to formula (5);

[0110]

[0111] Among them, Y is the backlight sub-frame black insertion time of the frame to be displayed, m is the backlight frequency multiplier of the frame to be displayed, Tf is the frame length of the frame to be displayed, and X is the black insertion ratio of the frame to be displayed.

[0112] It should be noted that after the backlight frequency is doubled, black insertion is performed in segments, and the backlight sub-frame black insertion time is the time of each black insertion segment. For example, if the backlight frequency is tripled, the frame signal is black inserted three times, each black insertion time is the same, and the ratio of the total black insertion time to the frame length to be displayed is still the black insertion ratio of the frame to be displayed.

[0113] Step S50 : providing a backlight driving signal to the backlight module according to the refresh rate of the frame to be displayed, the frequency multiplication information of the frame to be displayed, and the backlight sub-frame black insertion time of the frame to be displayed.

[0114] The backlight driving method disclosed in the present invention is used to provide a backlight driving signal for the backlight module, which can effectively improve the backlight dynamic blur of the display device. At the same time, by doubling the backlight frequency and increasing the current, the backlight brightness is stabilized and the problem of backlight flickering at low grayscale is solved.

[0115] According to another aspect of the present disclosure, a backlight driving device is provided, comprising an acquisition module and a processing module. The acquisition module is configured to acquire the refresh rate of the frame to be displayed and the parameters of the liquid crystal panel; the processing module is configured to determine the black insertion ratio of the frame to be displayed according to the refresh rate of the frame to be displayed and the parameters of the liquid crystal panel; the processing module is further configured to determine the frequency multiplication information of the frame to be displayed according to the refresh rate of the frame to be displayed and the black insertion ratio of the frame to be displayed; the processing module is further configured to determine the backlight sub-frame black insertion time of the frame to be displayed according to the refresh rate of the frame to be displayed, the black insertion ratio of the frame to be displayed and the frequency multiplication information of the frame to be displayed; the processing module is further configured to provide a backlight driving signal to the backlight module according to the refresh rate of the frame to be displayed, the frequency multiplication information of the frame to be displayed and the backlight sub-frame black insertion time of the frame to be displayed.

[0116] In some alternative embodiments, see Figure 6After the chip Scaler IC receives the image information, it sends the data update identification signal Vsync and the MOSI signal to the backlight MCU (Microcontroller Unit) through the SPI protocol. The MOSI signal includes the brightness data of the frame to be displayed and the refresh rate data of the frame to be displayed. The backlight MCU parses the MOSI signal to obtain the control signal TX_DI, and sends the control signal TX_DI to the LED driver (LEDdriver). The LED driver parses the control signal TX_DI and transmits the backlight drive signal RX_CH to the LED lamp beads, so that the LED lamp beads turn on and off according to the signal provided by the backlight drive signal RX_CH. Among them, when RX_CH = H, the LED lamp beads are off; when RX_CH = L, the LED lamp beads are on.

[0117] After the chip Scaler IC receives the image information, it can first encode the backlight brightness signal and frame rate signal, and send it to the backlight MCU according to the specified SPI format and timing requirements. Among them, the MOSI signal contains the backlight brightness signal, and the data update identification signal Vsync contains the frame rate signal. The backlight MCU decodes it to form the control signal TX_DI and sends the control signal TX_DI to the LED driver.

[0118] It should be noted that the chip Scaler IC first sends the frame rate signal Vsync to the backlight MCU, and then sends the MOSI signal to the backlight MCU through the SPI protocol. Among them, when the data update identification signal Vsync changes from low level to high level, it indicates that the next frame signal is about to arrive.

[0119] Figures 3 to 5 A schematic diagram of black insertion of RX_CH when the refresh rate of the frame to be displayed is within different ranges is shown. Figures 3 to 5 When the high and low levels in RX_CH alternate, it is the normal display period, and when the high level signal is continuous in one frame, it is the black insertion period.

[0120] Figure 3 The refresh rate of the frame to be displayed is within a first preset refresh rate range. For example, the first preset refresh rate range is greater than or equal to 48 Hz and less than or equal to 60 Hz. When the backlight multiplier is 3, RX_CH has three black insertions and three displays, and each black insertion lasts for 1 / 4 of the frame duration of the frame to be displayed, and each display lasts for 1 / 12 of the frame duration of the frame to be displayed. The purpose of multiplying the backlight frequency is to increase the backlight frequency to prevent the human eye from seeing backlight flicker.

[0121] Figure 4The refresh rate of the frame to be displayed is within the second preset refresh rate range. For example, the second preset refresh rate range is greater than or equal to 61 Hz and less than or equal to 99 Hz. When the backlight multiplier is 2, RX_CH has two black insertions and two displays, and the duration of each black insertion is 3 / 8 of the frame duration of the frame to be displayed, and the duration of each display is 1 / 8 of the frame duration of the frame to be displayed. The purpose of multiplying the backlight frequency is to increase the backlight frequency to prevent the human eye from seeing backlight flicker.

[0122] Figure 5 When the refresh rate of the frame to be displayed is within the third preset refresh rate range, for example, the third preset refresh rate range is greater than or equal to 100 Hz and less than or equal to 240 Hz, and the backlight multiplier is 1, RX_CH has one black insertion and one display, and the duration of each black insertion is 3 / 4 of the frame duration of the frame to be displayed, and the duration of each display is 1 / 4 of the frame duration of the frame to be displayed. In other words, in the third preset refresh rate range, the backlight frequency is no longer multiplied.

[0123] It should be noted that the first preset refresh rate range, the second preset refresh rate range, and the third preset refresh rate range defined above are only distance descriptions. The specific number of preset refresh rate ranges, the preset refresh rate ranges, and their corresponding backlight multipliers are not specifically restricted here and can be designed according to specific usage requirements.

[0124] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the backlight driving device can be divided into different functional modules to complete all or part of the functions described above. The functional modules in the embodiment can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software functional modules. In addition, the specific names of the functional modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0125] According to another aspect of the present disclosure, a display device is provided, comprising a backlight module and the aforementioned backlight driving device, the backlight driving device providing a backlight driving signal to the backlight module. The display device can be a product or component with a display function, such as a mobile phone, television, monitor, tablet computer, or navigation system.

[0126] According to another aspect of the present disclosure, an electronic device is provided, including a memory 902 and a processor 901 . The memory 902 stores a computer program, and when the computer program is executed by the processor, the above-mentioned backlight driving method is implemented.

[0127] Among them, the processor 901 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 902 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH).

[0128] In some optional embodiments, the electronic device further includes one or more I / O interfaces 903 connected between the processor and the memory and configured to enable data exchange between the processor and the memory. The I / O interface (read / write interface) 903 is connected between the processor 901 and the memory 902 to enable data exchange between the processor 901 and the memory 902, and includes but is not limited to a data bus.

[0129] In some embodiments, the processor 901 , the memory 902 , and the I / O interface 903 are connected to each other via a bus, and further connected to other components of the computing device.

[0130] In some other embodiments, the present disclosure provides a non-transitory computer-readable storage medium having a computer program stored thereon, which implements the above-mentioned backlight driving method when executed by a processor.

[0131] It will be appreciated by those skilled in the art that all or some of the steps, systems, and modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the divisions between the modules / units mentioned in the above description do not necessarily correspond to the divisions of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As is known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable, and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0132] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0133] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A backlight driving method, characterized in that: include: Obtain the refresh rate of the frame to be displayed and the parameters of the LCD panel; determining a black insertion ratio of the frame to be displayed according to a refresh rate of the frame to be displayed and parameters of the liquid crystal panel; determining frequency multiplication information of the frame to be displayed according to the refresh rate of the frame to be displayed and the black insertion ratio of the frame to be displayed; Determining a backlight sub-frame black insertion time of the frame to be displayed according to a refresh rate of the frame to be displayed, a black insertion ratio of the frame to be displayed, and frequency multiplication information of the frame to be displayed; A backlight driving signal is provided for the backlight module according to the frequency doubling information of the frame to be displayed and the backlight sub-frame black insertion time of the frame to be displayed.

2. The backlight driving method according to claim 1, wherein: The step of determining the black insertion ratio of the frame to be displayed according to the refresh rate of the frame to be displayed and the parameters of the liquid crystal panel includes: Determining the frame duration of the frame to be displayed according to the refresh rate of the frame to be displayed; Obtain the number of backlight black insertion partitions, vertical blanking time of the LCD panel, and LCD response time; Determining a minimum black insertion duration of the frame to be displayed according to the number of the backlight black insertion partitions, the vertical blanking time of the liquid crystal panel, the response time of the liquid crystal, and the frame duration of the frame to be displayed; The black insertion ratio of the frame to be displayed is determined according to the minimum black insertion duration of the frame to be displayed and the frame duration of the frame to be displayed.

3. The backlight driving method according to claim 2, wherein: The step of determining the minimum black insertion duration of the frame to be displayed according to the number of the backlight black insertion partitions, the vertical blanking time of the liquid crystal panel, the response time of the liquid crystal, and the frame duration of the frame to be displayed comprises: Determine the minimum black insertion time of the frame to be displayed according to formula (1); Among them, Ts is the minimum black insertion time of the frame to be displayed, Tf is the frame length of the frame to be displayed, Tvb is the vertical blanking time of the LCD panel, Tr is the response time of the liquid crystal, and n is the number of backlight black insertion partitions.

4. The backlight driving method according to claim 2, wherein: The step of determining the black insertion ratio of the frame to be displayed according to the minimum black insertion duration of the frame to be displayed and the frame duration of the frame to be displayed includes: Determine the black insertion ratio of the frame to be displayed according to formula (2); Wherein, Ts is the minimum black insertion time of the frame to be displayed, Tf is the frame time of the frame to be displayed, X is the black insertion ratio of the frame to be displayed, and Tb is a constant greater than 0 and less than Tf-Ts.

5. The backlight driving method according to claim 4, wherein: The step of determining the black insertion ratio of the frame to be displayed according to the minimum black insertion duration of the frame to be displayed and the frame duration of the frame to be displayed further comprises: Get the maximum response time of dynamic images; Set the constant Tb to a preset value; Determine the dynamic picture response time of the frame to be displayed according to formula (3) and the preset value; Among them, MPRT is the dynamic picture response time of the frame to be displayed; Determine whether the dynamic picture response time of the frame to be displayed is greater than the maximum dynamic picture response time. If the dynamic picture response time of the frame to be displayed is greater than the maximum dynamic picture response time, adjust the constant Tb to correct the black insertion ratio; if the dynamic picture response time of the frame to be displayed is less than the maximum dynamic picture response time, the constant Tb remains at the preset value.

6. The backlight driving method according to any one of claims 1 to 5, characterized in that: The step of determining the frequency multiplication information of the frame to be displayed according to the refresh rate of the frame to be displayed and the black insertion ratio of the frame to be displayed includes: Determining a backlight frequency multiplication factor of the frame to be displayed according to the refresh rate of the frame to be displayed; determining a current compensation multiple of the frame to be displayed according to the black insertion ratio of the frame to be displayed; The frequency multiplication information of the frame to be displayed includes a backlight frequency multiplication factor of the frame to be displayed and a current compensation factor of the frame to be displayed.

7. The backlight driving method according to claim 6, wherein: The step of determining the backlight frequency multiplication factor of the frame to be displayed according to the refresh rate of the frame to be displayed comprises: Acquire multiple preset refresh rate ranges, each of the preset refresh rate ranges corresponds to a frequency multiplier, and different preset refresh rate ranges correspond to different frequency multipliers; Matching the refresh rate of the frame to be displayed with a plurality of preset refresh rate ranges, and using the frequency multiplier corresponding to the matched preset refresh rate range as the backlight frequency multiplier of the frame to be displayed; Among them, the larger the minimum value of the preset refresh rate range is, the smaller the corresponding multiplier is.

8. The backlight driving method according to claim 6, wherein: The step of determining the current compensation multiple of the frame to be displayed according to the black insertion ratio of the frame to be displayed includes: Determine the current compensation multiple of the frame to be displayed according to formula (4); Wherein, A is the current compensation multiple of the frame to be displayed, and A is less than or equal to the maximum current compensation multiple, and X is the black insertion ratio of the frame to be displayed.

9. The backlight driving method according to claim 6, wherein: The step of determining the backlight sub-frame black insertion time of the frame to be displayed according to the refresh rate of the frame to be displayed, the black insertion ratio of the frame to be displayed and the frequency multiplication information of the frame to be displayed includes: determining the backlight sub-frame black insertion time of the frame to be displayed according to the backlight frequency multiplication multiple of the frame to be displayed, the frame length of the frame to be displayed and the black insertion ratio of the frame to be displayed.

10. The backlight driving method according to claim 9, wherein: The step of determining the backlight sub-frame black insertion time of the frame to be displayed according to the backlight frequency multiplication factor of the frame to be displayed, the frame duration of the frame to be displayed, and the black insertion ratio of the frame to be displayed comprises: Determine the backlight sub-frame black insertion time of the frame to be displayed according to formula (5); Among them, Y is the backlight sub-frame black insertion time of the frame to be displayed, m is the backlight frequency multiplier of the frame to be displayed, Tf is the frame length of the frame to be displayed, and X is the black insertion ratio of the frame to be displayed.

11. A backlight driving device, characterized in that: include: an acquisition module configured to acquire a refresh rate of a frame to be displayed and parameters of a liquid crystal panel; a processing module configured to determine a black insertion ratio of the frame to be displayed according to a refresh rate of the frame to be displayed and parameters of the liquid crystal panel; The processing module is further configured to determine frequency multiplication information of the frame to be displayed according to the refresh rate of the frame to be displayed and the black insertion ratio of the frame to be displayed; The processing module is further configured to determine a backlight sub-frame black insertion time of the frame to be displayed according to the refresh rate of the frame to be displayed, the black insertion ratio of the frame to be displayed, and the frequency multiplication information of the frame to be displayed; The processing module is further configured to provide a backlight driving signal for the backlight module according to the refresh rate of the frame to be displayed, the frequency multiplication information of the frame to be displayed, and the backlight sub-frame black insertion time of the frame to be displayed.

12. A display device, characterized in that: The invention comprises a backlight module and the backlight driving device according to claim 11, wherein the backlight driving device provides a backlight driving signal for the backlight module.

13. An electronic device, characterized in that: The device comprises a memory and a processor, wherein a computer program is stored in the memory, and is characterized in that when the computer program is executed by the processor, the backlight driving method according to any one of claims 1 to 10 is implemented.

14. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the backlight driving method according to any one of claims 1 to 10 is implemented.

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