Partition-based driving method and apparatus for backlight system

Abstract

A partition-based driving method and apparatus for a backlight system. The backlight system comprises a plurality of light-emitting units, each light-emitting unit comprises a plurality of light-emitting elements, and the plurality of light-emitting elements of each light-emitting unit emits light of different colors. The partition-based driving method for a backlight system comprises: partitioning a backlight system (S11); and, on the basis of the display color of a corresponding display area, respectively adjusting the chromaticity of light-emitting units in a plurality of partitions (S12). On the basis of the display color of the corresponding display area, the partition chromaticity of the backlight system is adjusted, such that the color display of the backlight is consistent with that of a display panel, thereby reducing energy consumption.

Description

Backlight system partition driving method and device TECHNICAL FIELD

[0001] The present application relates to the technical field of light emitting element driving, and in particular to a backlight system partition driving method and device. BACKGROUND

[0002] In the existing backlight dimming, for white light LED, LED dimming affects the white light brightness; for blue LED excitation quantum film to form white light, LED dimming affects the blue light brightness.

[0003] That is, in the existing backlight dimming, no matter which LED dimming, the white light brightness finally transmitted to the foreground panel is affected. SUMMARY

[0004] The present application provides a backlight system partition driving method and device to solve the problem that only brightness adjustment can be achieved in the prior art.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme:

[0006] According to a first aspect of the present application, a backlight system partition driving method is provided, the backlight system comprising a plurality of groups of light emitting units, each group of light emitting units comprising a plurality of light emitting elements, the light emitting colors of the plurality of light emitting elements of each group of light emitting units being different, and the driving method comprising:

[0007] partitioning the backlight system;

[0008] adjusting the chromaticity of the light emitting units in the plurality of partitions based on the display color of the corresponding display area.

[0009] Optionally, after partitioning the backlight system, the method further comprises:

[0010] adjusting the brightness of the light emitting units in the plurality of partitions based on the display brightness of the corresponding display area.

[0011] Optionally, adjusting the chromaticity of the light emitting units in the plurality of partitions based on the display color of the corresponding display area specifically comprises:

[0012] based on the composition ratio of the colors of the image to be presented by the corresponding display area, reducing the light emitting brightness of the light emitting elements corresponding to the color with low proportion, that is, adjusting the chromaticity of the light emitting units.

[0013] Optionally, after reducing the light emitting brightness of the light emitting elements corresponding to the color with low proportion based on the composition ratio of the colors of the image to be presented by the corresponding display area, the method further comprises:

[0014] The transmittance of the color with reduced luminous brightness is improved.

[0015] Optionally, before the backlight system is partitioned, the method further comprises:

[0016] The wavelengths of the multiple light emitting elements of each color are respectively concentrated to be consistent;

[0017] The luminous brightness of the multiple light emitting elements of each color is respectively adjusted to be consistent;

[0018] Optionally, the concentration adjustment of the wavelengths of the multiple light emitting elements comprises:

[0019] An initial driving current is provided to the multiple light emitting elements;

[0020] The wavelength of each light emitting element is measured, and when it is inconsistent with a preset wavelength, the initial driving current corresponding to the light emitting element is adjusted so that the wavelength of the light emitting element is consistent with the preset wavelength.

[0021] Optionally, the adjustment of the luminous brightness of the multiple light emitting elements comprises:

[0022] The duty cycle of the light emitting element is adjusted to adjust the luminous brightness of the light emitting element to be consistent with a target luminous brightness;

[0023] The target luminous brightness is the lowest luminous brightness of the multiple light emitting elements.

[0024] Optionally, before the backlight system is partitioned, the method further comprises:

[0025] The component ratio of the light emitting color in the light emitting unit is adjusted to adjust the color temperature of the light emitting unit, i.e., the overall color temperature is adjusted first, and then the partitioned chroma is adjusted. When the partitioned light is adjusted, the color temperature of the light emitting unit is first adjusted to reach the maximum luminous brightness at a certain color temperature.

[0026] According to a second aspect of the present application, a backlight system partition driving device is provided, the backlight system comprising multiple groups of light emitting units, each group of light emitting units comprising multiple light emitting elements, the light emitting colors of the multiple light emitting elements of each group of light emitting units being different, and the partition driving device comprising:

[0027] A partition module is configured to partition the backlight system;

[0028] The partition light adjusting module is used for adjusting the chroma of the light emitting units in the multiple partitions respectively based on the color of the corresponding display area.

[0029] Optionally, the method further comprises:

[0030] The wavelength centralized adjustment module is used for adjusting the wavelength of the multiple light emitting elements of each color respectively, so that the wavelengths tend to be consistent.

[0031] The brightness centralized adjustment module is used for adjusting the light emitting brightness of the multiple light emitting elements of each color respectively, so that the light emitting brightness tends to be consistent.

[0032] According to a third aspect of the present application, an electronic device is provided, comprising:

[0033] a processor;

[0034] and a memory for storing processor-executable instructions;

[0035] wherein the processor implements the steps in any of the above methods by running the executable instructions.

[0036] According to a fourth aspect of the present application, a computer-readable storage medium is provided, which stores a computer program, the computer program being executed by a processor to implement the steps in any of the above methods.

[0037] The backlight system partition driving method and device provided by the present application adjust the chroma of the backlight system by partitions, so that the color is consistent with the color display of the display panel, the chroma of the color which does not need to be transmitted is reduced, and the energy consumption is reduced.

[0038] In an optional solution of the present application, the backlight system is also adjusted by partitions in brightness, so that the color brightness of the backlight corresponding partition is consistent with the color brightness of the display panel, and the contrast of the image display is improved.

[0039] In an optional solution of the present application, the wavelength of the multiple light emitting elements of each light emitting color is adjusted by centralization, so that the light emitting wavelength of the light emitting element tends to be consistent, and the light emitting consistency is improved; the light emitting brightness of the multiple light emitting elements of the light emitting system is also processed by centralization, the brightness is more uniform, and the light emitting effect is better.

[0040] In an optional solution of the present application, the wavelength of the multiple light emitting elements of each light emitting color is adjusted by centralization, so that the light emitting element selection requirement is relatively low, even if the wavelength is relatively discrete, it does not matter, the selection time is saved; and because the light emitting element selection requirement is low, the defective rate of the light emitting element is low, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on these drawings.

[0042] Fig. 1 is a flow chart of a backlight system partition driving method according to an embodiment of the present application;

[0043] Fig. 2a is a display diagram of a corresponding display system according to the prior art;

[0044] Fig. 2b is a backlight partition adjustment diagram according to the prior art;

[0045] Fig. 3a is a display diagram of a corresponding display system according to an embodiment of the present application;

[0046] Fig. 3b is a backlight system partition chroma adjustment diagram according to an embodiment of the present application;

[0047] Fig. 4 is a wavelength centralization adjustment diagram according to an embodiment of the present application;

[0048] Fig. 5 is a flow chart of a wavelength centralization adjustment according to an embodiment of the present application;

[0049] Fig. 6 is a curve diagram of a wavelength centralization adjustment according to an embodiment of the present application;

[0050] Fig. 7 is a flow chart of a backlight system partition driving method according to an embodiment of the present application;

[0051] Fig. 8 is a color gamut range diagram after wavelength centralization adjustment according to an embodiment of the present application;

[0052] Fig. 9 is a color gamut range diagram without wavelength centralization adjustment;

[0053] Fig. 10 is a flow chart of a backlight system partition driving method according to an embodiment of the present application;

[0054] Fig. 11 is a diagram of a backlight system partition driving device according to an embodiment of the present application;

[0055] Fig. 12 is a diagram of an electronic device according to an embodiment of the present application;

[0056] Legend of reference numerals: 11 - partition module, 12 - partition adjustment module; 21 - processor, 22 - internal bus, 23 - network interface, 24 - internal memory, 25 - storage. DETAILED DESCRIPTION

[0057] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0058] In the description of the specification of the present application, it should be understood that the terms "upper", "lower", "upper end", "lower end", "lower surface", "upper surface" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0059] In the description of the specification of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0060] In the description of the present application, the meaning of "a plurality of" is a plurality, for example, two, three, four, etc., unless otherwise explicitly specified and limited.

[0061] In the description of the specification of the present application, unless otherwise explicitly specified and limited, the term "connection" and the like should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For a person of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0062] The technical solutions of the present application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described in some embodiments.

[0063] As mentioned above, existing backlight dimming technologies, regardless of the specific dimming method, only affect the brightness of the white light transmitted to the foreground panel (which can be an LCD panel). LCD panels display color images by changing the transmittance T of different color pixels. For example, when a certain area on the LCD panel displays red, most of the blue and green light in the corresponding backlight does not transmit through the LCD panel. In response, this invention creatively proposes that this wastes spectral components in the backlight that do not need to be transmitted, resulting in insufficient energy efficiency.

[0064] In view of the problems mentioned above, in one embodiment of the present invention, a backlight system partition driving method is provided, wherein the backlight system includes multiple groups of light-emitting units, each group of light-emitting units includes multiple light-emitting elements, and the multiple light-emitting elements of each group of light-emitting units emit different colors.

[0065] As one implementation method, the backlight system can be an RGB backlight system. Specifically, the backlight system includes multiple RGB light-emitting units, each RGB light-emitting unit corresponds to three light-emitting elements, and each light-emitting element corresponds to a color: red, green, and blue.

[0066] As another implementation method, a dual-color backlight system can be used, employing two complementary colors to produce white light. Of course, for backlight systems that do not require white light, other suitable colors can be selected as needed.

[0067] Please refer to Figure 1. Partitioning methods include:

[0068] S11: Divide the backlight system into zones;

[0069] In practice, the display area of ​​the LCD panel can be divided into zones according to the color distribution of the display area, as illustrated below;

[0070] S12: Based on the display color of the corresponding display area, adjust the chromaticity of the light-emitting units in multiple zones respectively.

[0071] For a backlight system, the luminance of the nth light-emitting element can be expressed by the following formula: L ri =K1*I n *D n , where I n For the drive current value, D n For the duty cycle of work.

[0072] Taking an RGB backlight system as an example, dimming the light-emitting units in multiple zones can be expressed by the following formula:

[0073] L B_ri =K1*I Bn *D nT Bn ,

[0074] L G_ri = K1 * I Gn D n T Gn ,

[0075] L R_ri = K1 * I Rn D n T Rn ;

[0076] Wherein, T Bn , T Gn , T Rn respectively represent the blue, green, red dimming duty cycle. By adjusting the above dimming duty cycle, the adjustment of the chromaticity of the light emitting unit can be realized.

[0077] For the existing backlight dimming, the white light brightness transmitted to the liquid crystal panel is affected, and the color change is not involved, please refer to Figures 2a and 2b. As shown in Figure 2a, the liquid crystal panel displays an image, and Figure 2b is the corresponding backlight brightness. For the position of the candle flame, the image is bright, and the corresponding backlight partition brightness is also relatively high. For the bottom of the candle flame and the candle, the bottom of the candle and other black backgrounds, the brightness is relatively low, and the backlight only involves the change of white light brightness.

[0078] And the embodiment of the present application realizes the adjustment of the chromaticity, please refer to Figure 3b, through the adjustment of the chromaticity, part of the light is saved. The liquid crystal panel displays a color image by changing the transmittance T of different color pixels, as shown in Figure 3a, the red color in the yellow box is displayed because most of the blue and green in the backlight does not transmit through the liquid crystal panel, that is, the blue and green in the backlight in this area is not needed to participate in the image display, so this part of light is wasted, in the embodiment, the content of blue and green in the backlight in the partition can be reduced through the adjustment of the partition chromaticity. As shown in Figure 3a, the value of the pixel RGB in point A on the liquid crystal panel is (255, 128, 32), at this time, the A point brightness is:

[0079] It can be seen that (255-128) / 255 parts of K*I Gn D n d G are wasted, and (255-32) / 255 parts of K*I Bn D n d BWasted, that is, the green light, blue light ratio is low. By adjusting the backlight partition chroma, the luminous intensity of the green and blue light emitting elements in the partition is actively reduced (that is, the chroma of the light emitting unit is adjusted), for example: the green light can be reduced to 50%, and the blue light can be reduced to 12.5%, that is, T Rn is 100%, T Gn is 50%, T Bn is 12.5%, so 50% of the green light power consumption and 87.5% of the blue light power consumption are saved, and the waste of this part of the power consumption is avoided, and energy is saved.

[0080] It should be understood that there are many ways to determine the low ratio: (1) it can be determined as low below 255, such as in the above embodiment, the green light and blue light below 255 are determined as low, and the chroma of the green light and blue light is adjusted; (2) a ratio preset value can also be set, which is lower than the ratio preset value, which is determined as low, assuming that the ratio preset value is 130, then the green light and blue light are also determined as low, and the chroma of the green light and blue light is adjusted; Assuming that the ratio preset value is 120, then only the blue light is determined as low, and only the chroma of the blue light is adjusted.

[0081] The chroma adjustment of the low ratio of the light emitting color can also have many ways: (1) the ratio of the light emitting color to 255 can be used to determine the size of the chroma adjustment; (2) a ratio preset value range and a corresponding chroma adjustment preset value can also be set, when its ratio value is in the ratio preset value range, its chroma is adjusted according to the corresponding chroma adjustment preset value, for example: assuming that the ratio preset value range is 【100-130】, the corresponding chroma adjustment preset value is 55%, then the green light ratio value is in the range, the green light is reduced to 55%; The ratio preset value range can be set to one or more, such as in addition to the above 【100-130】, the ratio preset value range 【30-60】 can also be set, and the corresponding chroma adjustment preset value is 15%, then the blue light ratio value is in the range, the blue light is reduced to 15%.

[0082] Of course, the above ratio preset value range and chroma adjustment value are only examples, which can be set differently as needed; and the above is only a targeted example for the above (255, 128, 32) pixel values, in order to cover more pixel values, the ratio preset value range can also be set more.

[0083] In an embodiment, due to the reduction of the chroma of the part of the light, the luminance of the A point is reduced, for this, the corresponding transmittance T can be increased while the chroma of the green light and blue light is reducedAG and T AG , so that the LA can be unchanged on the basis of energy saving:

[0084] That is, when the green light is reduced to 50%, and the blue light is reduced to 12.5%, the pixel value corresponding to point A in the backlight can be compensated to (255, 255, 255) through the increase of the transmittance, so that the same color can be displayed on the panel, but 50% of the green light power consumption and 87.5% of the blue light power consumption are saved.

[0085] In the above embodiment, for the adjustment of the chromaticity of the light emitting unit, only the luminous intensity of the light emitting element corresponding to the light emitting color with low proportion is reduced, and no measures are taken for the light emitting element corresponding to the light emitting color with high proportion. In different embodiments, on the basis of reducing the luminous intensity of the light emitting element corresponding to the light emitting color with low proportion, the luminous intensity of the light emitting element corresponding to the light emitting color with high proportion can also be increased.

[0086] In an embodiment, in addition to adjusting the chromaticity, the luminance can also be adjusted. For the sub-area corresponding to the display area with relatively high brightness, the luminance of the light emitting unit can be increased, and for the sub-area corresponding to the display area with relatively low brightness, the luminance of the light emitting unit can be reduced, so that the backlight corresponding to the sub-area is consistent with the luminance of the display panel, and the contrast of the image display is improved.

[0087] For example, when T Bn , T Gn , TR n different proportionally, that is, the adjustment of the luminance and chromaticity of the light emitting unit of the sub-area is realized.

[0088] In an embodiment, before the backlight system is partitioned, it further includes:

[0089] S21: The wavelengths of the multiple light emitting elements of each color are respectively concentratedly adjusted to be consistent;

[0090] S22: The luminous intensities of the multiple light emitting elements of each color are respectively concentratedly adjusted to be consistent.

[0091] The backlight system driving method of the above embodiment first concentrates the wavelength of the multiple light emitting elements of each color respectively through S21, so the original wavelength requirement is relatively low, and the selection requirement of the light emitting element is relatively low, even if the wavelength is relatively discrete, it does not matter, and the selection time is saved. Because the selection requirement of the light emitting element is low, the failure rate of the light emitting element is low, and the cost is reduced. Secondly, after the wavelength concentration adjustment, the wavelength is more concentrated, and the fluctuation range is smaller, which can be smaller than 5nm of a chroma, so the light emitting consistency is better. In addition, the light emitting brightness of the multiple light emitting elements of each color is concentrated through S22, the brightness is more uniform, and the light emitting effect is better.

[0092] Further, the backlight system driving method of the above embodiment expands the color gamut of the backlight system through S21, which can make the color gamut of the multi-color light emitting system wider. The principle will be described below. Please refer to FIG. 5 for a color gamut range diagram after the wavelength concentration adjustment of the above embodiment. Take the RGB three-color light emitting system as an example. After the wavelength concentration adjustment, the wavelengths of the light emitting elements of R, G and B are reduced to a relatively small range, as shown in blocks 2, 1 and 3 in the figure. The color gamut range of the mixed light of the three colors is a triangle surrounded by the dashed line in the figure. Please refer to FIG. 6 for a color gamut range diagram when the wavelength consistency is not adjusted in the prior art. The light emitting elements after the mixing of the three colors are within the "greatest common divisor" range of the respective color coordinates, that is, the triangular part marked with diagonal lines in the figure. From the comparison of the two color gamut ranges, the wavelength concentration adjustment of the above embodiment does not affect the inherent color gamut of the light emitting element, and can keep the color coordinates and color gamut range stable. Compared with the prior art without wavelength adjustment, the above embodiment can expand the color gamut range of the multi-color light emitting system.

[0093] As an embodiment, for the RGB light emitting system, the wavelength concentration and light emitting brightness consistency adjustment is needed for the light emitting elements of R, G and B.

[0094] It should be understood that the adjustment order is not limited as long as the wavelength centralization and the luminous intensity uniformization adjustment of the light emitting elements of multiple colors are achieved. The wavelength centralization adjustment of the light emitting elements of R, G and B colors can be performed first, and then the luminous intensity uniformization adjustment of the light emitting elements of R, G and B colors can be performed; or the wavelength centralization and luminous intensity uniformization adjustment of the light emitting elements of one color can be performed first, and then the wavelength centralization and luminous intensity uniformization adjustment of the light emitting elements of the other two colors can be performed in turn. Of course, the wavelength centralization and luminous intensity uniformization adjustment of the three colors can be performed simultaneously.

[0095] As an embodiment, in the wavelength centralization adjustment of the light emitting elements of each color, the wavelengths of the light emitting elements are not necessarily the same, but can fluctuate within a preset range. By way of example, referring to FIG. 7, the green light of two BIN colorimetric values (G1m-G2m) is taken as an example. The range of the two BINs can be reduced to the range shown in block 1, for example, ±1 nm, as shown in FIG. 7. The wavelength after adjustment is within the range of 527±1 nm. The fluctuation range can be set according to the requirement of the luminous uniformity. If the luminous uniformity requirement is high, the fluctuation range can be set to be small, and if the luminous uniformity requirement is low, the fluctuation range can be set to be large.

[0096] As an embodiment, in the luminous intensity centralization adjustment of the light emitting elements of each color, the luminous intensities of the light emitting elements are not necessarily the same, but can fluctuate within a preset range. The specific fluctuation range can be set according to the requirement of the luminous intensity uniformity. If the luminous intensity uniformity requirement is high, the fluctuation range can be set to be small, and if the luminous intensity uniformity requirement is low, the fluctuation range can be set to be large.

[0097] In an embodiment, referring to FIG. 8, the wavelength centralization adjustment of the light emitting elements of each color includes the following steps.

[0098] S211: An initial driving current I is provided to the light emitting elements, and at this time, the light emitting elements are in a light emitting state, but the wavelengths of the light emitting elements are different;

[0099] As an embodiment, the initial driving current can be determined according to the characteristics of the light emitting elements and the target wavelength.

[0100] S212: The wavelength of each light emitting element is measured to determine whether the wavelength is consistent with the preset wavelength;

[0101] S213: When the wavelength is not consistent with the preset wavelength, the initial driving current corresponding to the light emitting element is adjusted to make the wavelength consistent with the preset wavelength.

[0102] As an embodiment, S212 can be implemented in the way of successive current trimming.

[0103] The successive current trimming is described in detail below by an example. Taking a green LED as an example, suppose that the initial driving current is 20 mA and the preset wavelength is 527 nm. As shown in FIG. 9, it is a characteristic curve diagram of the forward current and the main wavelength of the green LED. The wavelength of each LED is measured. Referring to FIG. 9, suppose that the wavelength of the 12th LED is measured to be 523 nm, then the driving current of the 12th LED is reduced by 2 mA step by step, and the wavelength is measured again after each reduction, until the wavelength is close to 527 nm. In the diagram, the current is trimmed four times, and the wavelength is measured five times.

[0104] The above example is described by taking the measured wavelength shorter than the preset wavelength as an example. In different embodiments, when the measured wavelength is longer than the preset wavelength, the adjustment principle is similar to the above scheme, and the driving current can be increased by 2 mA step by step.

[0105] In the above embodiments, the successive current trimming is implemented by taking the preset step by step trimming as an example, and the preset step of each trimming is the same. In different embodiments, the step of each trimming is not necessarily the same, and can be adjusted according to actual conditions. For example, when the measured wavelength and the preset wavelength differ greatly (for example, the difference is greater than a first preset value), a large step can be used for adjustment first, and when the adjustment is close to the preset wavelength (for example, the difference is less than a second preset value), a small step can be used for adjustment.

[0106] Because the characteristic curve of the forward current and the main wavelength of each light emitting element is different, the adjustment error of the wavelength consistency is smaller by using the successive current trimming.

[0107] It should be understood that the initial driving current value, the preset wavelength value, and the current adjustment step value given above are all examples, and different embodiments can have different settings.

[0108] Of course, in different embodiments, the adjustment of the driving current in S212 can also not use the form of successive trimming, but the ratio of the corresponding current can be calculated according to the ratio of the wavelength of the light emitting element to the preset wavelength, and the current can be adjusted to the right place at one time according to the ratio.

[0109] In different embodiments, the difference of the corresponding current can also be calculated according to the difference of the wavelength of the light emitting element to the preset wavelength, and the current can be adjusted to the right place at one time according to the difference.

[0110] In one embodiment, the light emitting brightness of the plurality of light emitting elements of each color is adjusted respectively in S22, which specifically includes: adjusting the duty cycle of the light emitting element, and adjusting the light emitting brightness of the light emitting element to the lowest light emitting brightness among the plurality of light emitting elements (target light emitting brightness).

[0111] Since the driving current has been determined after the wavelength concentration adjustment, no further adjustment can be made, and the present application proposes that the duty cycle can be adjusted to achieve the light emitting brightness adjustment. If the light emitting brightness is adjusted by the duty cycle, the light emitting element with the lowest light emitting brightness cannot have its brightness increased even if the duty cycle is 100%, so the high light emitting brightness needs to be reduced to the brightness, i.e., the light emitting brightness of the light emitting element is adjusted to the lowest light emitting brightness among the plurality of light emitting elements.

[0112] As an implementation, the light emitting brightness adjustment of the nth light emitting element can be represented by the following relationship: ri L = K * I n * D n wherein K is an inherent parameter of the light emitting element, K of different light emitting elements can be different, I n is the driving current value after the adjustment in S112, and D n is the duty cycle.

[0113] As an implementation, the adjustment of the light emitting brightness of each light emitting element in S22 can also be performed by gradually adjusting the duty cycle.

[0114] The gradual adjustment of the duty cycle is described in detail below by an example. For the light emitting element with high light emitting brightness, the duty cycle can be reduced by 5% steps, and the brightness is measured again after each reduction until the target light emitting brightness is approached.

[0115] It should be understood that the adjustment step value of the duty cycle given above is only an example, and different embodiments can have different settings.

[0116] In addition, in the above embodiment, the gradual adjustment of the duty cycle is implemented by gradually adjusting the preset step, and the preset step of each adjustment is the same. In different embodiments, the step of each adjustment can not be the same, and can be adjusted according to the actual situation. For example, when the current light emitting brightness is greatly different from the target light emitting brightness (e.g., the difference is greater than a first preset value), a large step can be used for adjustment first, and when the adjustment is close to the target light emitting brightness (e.g., the difference is less than a second preset value), a small step can be used for adjustment.

[0117] Of course, in different embodiments, the adjustment of the duty cycle of the working can not be in the way of successive fine-tuning, but can be calculated according to the ratio between the luminous brightness and the target luminous brightness, and adjusted to the target luminous brightness at one time.

[0118] In different embodiments, the difference between the luminous brightness and the target luminous brightness can also be calculated to obtain the difference between the duty cycle of the working and the duty cycle of the working when the target luminous brightness is reached, and the duty cycle of the working can be adjusted according to the difference to reach the target luminous brightness at one time.

[0119] In an embodiment, S212 further includes storing the final current data of each light emitting element to complete the color coordinate centralized calibration. S22 further includes storing the final duty cycle data of each light emitting element to complete the brightness consistent calibration. For the backlight system determined by the light emitting element, the above driving process is equivalent to the initial driving calibration, which only needs to be completed once, and the subsequent process only needs to call the stored current data and duty cycle data.

[0120] In an embodiment, S11 further includes:

[0121] S31: adjusting the component ratio of the light emitting color in the light emitting unit to adjust the color temperature of the light emitting unit.

[0122] As an embodiment, taking RGB as an example, the adjustment of the component ratio of the light emitting color in the light emitting unit (i.e. the color temperature duty cycle d) in S31 can be expressed by the following relationship:

[0123] L B_ri =K1*I Bn *D n *d B ,

[0124] L G_ri =K1*I Gn *D n *d G ,

[0125] L R_ri =K1*I Rn *D n *d R ;

[0126] Wherein, d B , d G , d R represent the duty cycles of blue, green and red corresponding to different color temperatures respectively.

[0127] The color temperature adjustment is described in detail below by an example. According to the brightness equation of BT2020, the brightness ratio of R, G, B three colors mixed into 6500K white light is 0.2627:0.6780:0.0593, i.e. Y=0.2627R+0.6780G+0.0593B. For a backlight system, the ratio of maximum brightness of R, G, B is not necessarily the same as the ratio of the above brightness equation coefficients, so the color temperature of the mixed light is not necessarily 6500K. Assuming that the uniformized brightness ratio of R, G, B is 1:2:1, the color temperature duty cycle d needs to be set respectively to make L R_ri : L G_ri : L B_ri =0.2627:0.6780:0.0593; d R =K2*(0.2627 / 1)*100%, d G =K2*(0.6780 / 2)*100, d B =K2*(0.0593 / 1)*100%; the brightness Y d is the maximum white field brightness at 6500K color temperature. Of course, in different embodiments, if d values at other color temperatures are needed, they can be calculated according to the brightness equation coefficients.

[0128] As an implementation, the calculation of d can be performed in a "measurement-adjustment-measurement" manner, so that the obtained d value is more accurate.

[0129] After increasing the color temperature adjustment, the light emitting units in multiple partitions are respectively adjusted in brightness, which can be represented by the following relationship:

[0130] L B_ri =K*I Bn *D n *d B *T Bn ,

[0131] L G_ri =K*I Gn *D n *d G *T Gn ,

[0132] L R_ri =K*I Rn *D n *d R *T Rn .

[0133] In an embodiment, after S31, further comprising: storing the final component proportion data, and completing the color temperature calibration. For the backlight system determined by the light emitting elements, the above driving process is equivalent to the initial driving calibration, which only needs to be completed once, and the subsequent process only needs to call the stored component proportion data.

[0134] In an embodiment, the color temperature adjustment can be included simultaneously with the wavelength centralization adjustment and the light emitting brightness centralization adjustment, that is, S31 can be between S22 and S11. According to S21 and S22, the current value and the working duty cycle of each light emitting element are obtained, but at this time, the ratio of the maximum brightness of R, G, and B is not the same as the ratio of the above brightness equation coefficients after the brightness is consistent, so the color temperature of the mixed light is not 6500K. After the color temperature adjustment of S31, the maximum white field brightness under the color temperature of 6500K can be obtained.

[0135] In an embodiment, a backlight system partition driving apparatus is also provided, the backlight system comprising a plurality of light emitting units, each of the plurality of light emitting units comprising a plurality of light emitting elements, and the plurality of light emitting elements of each of the plurality of light emitting units having different light emitting colors. Referring to FIG. 11, the backlight system partition driving apparatus comprises:

[0136] a partition module 11 configured to partition the backlight system;

[0137] a partition dimming module 12 configured to adjust the chromaticity of the light emitting units in the plurality of partitions based on the color of the corresponding display area.

[0138] In an embodiment, the backlight system partition driving apparatus further comprises:

[0139] a wavelength centralization adjustment module configured to respectively perform centralization adjustment on the wavelengths of the plurality of light emitting elements of each light emitting color, so that the wavelengths tend to be consistent;

[0140] a light emitting brightness centralization adjustment module configured to respectively perform centralization adjustment on the light emitting brightness of the plurality of light emitting elements of each light emitting color, so that the light emitting brightness tends to be consistent.

[0141] In an embodiment, the wavelength centralization adjustment module specifically comprises:

[0142] an initial driving current providing module configured to provide an initial driving current to the plurality of light emitting elements;

[0143] a current fine adjustment module configured to measure the wavelength of each light emitting element, and when the wavelength is inconsistent with a preset wavelength, adjust the initial driving current corresponding to the light emitting element, so that the wavelength tends to be consistent with the preset wavelength.

[0144] In an embodiment, the backlight system partition driving apparatus further comprises:

[0145] The color temperature adjusting module is configured to adjust a proportion of a light emitting color in the light emitting unit (i.e. a color temperature duty cycle), so as to adjust the color temperature of the light emitting unit.

[0146] In one embodiment, an electronic device is provided, please refer to Fig. 12. In hardware level, the device includes a processor 21, an internal bus 22, a network interface 23, a memory 24 and a storage 25, and of course, other hardware required by business. One or more embodiments of the present application can be implemented in software manner, such as reading corresponding computer program from the storage 25 to the memory 24 by the processor 21 and then running. Of course, in addition to the software implementation, one or more embodiments of the present application do not exclude other implementation manners, such as logic device or combination of software and hardware, etc., that is, the execution subject of the following processing flow is not limited to each logic unit, but also can be hardware or logic device.

[0147] The system, apparatus, module or unit illustrated in the above embodiments can be implemented by a computer chip or entity, or by a product with certain functions. A typical implementation device is a computer, and the specific form of the computer can be a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email transceiver device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0148] In a typical configuration, the computer includes one or more processors (CPU), input / output interface, network interface and memory.

[0149] The memory can include non-persistent memory in computer readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of computer readable media.

[0150] Computer-readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage, quantum memory, graphene-based storage media, or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to computing devices. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0151] The above describes specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the acts or steps recited in the claims can be performed in a different order than the order described in the embodiments and still achieve the desired result. In addition, the processes depicted in the figures do not necessarily require the particular order shown or sequential order in order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0152] In the description of the present specification, the description of the terms "one embodiment", "one example", "specific implementation process", "one example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0153] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for driving a backlight system by partition, characterized in that, The backlight system comprises multiple groups of light emitting units, each group of the light emitting units comprises multiple light emitting elements, the light emitting colors of the multiple light emitting elements of each group of the light emitting units are different, and the driving method comprises: partitioning the backlight system; adjusting the chromaticity of the light emitting units in multiple partitions respectively based on the display color of the corresponding display area.

2. The method of claim 1, wherein, After partitioning the backlight system, further comprising: adjusting the luminance of the light emitting units in multiple partitions respectively based on the display luminance of the corresponding display area.

3. The method of claim 1, wherein the method further comprises: Adjusting the chromaticity of the light emitting units in multiple partitions respectively based on the display color of the corresponding display area, specifically comprising: based on the composition ratio of the colors required to present the image of the corresponding display area, reducing the light emitting luminance of the light emitting elements corresponding to the color with low proportion.

4. The method of claim 3, wherein the step of dividing the backlight system into a plurality of zones comprises: After reducing the light emitting luminance of the light emitting elements corresponding to the color with low proportion based on the composition ratio of the colors required to present the image of the corresponding display area, further comprising: increasing the transmittance of the color with reduced light emitting luminance.

5. The method of claim 1, wherein the method further comprises: Before partitioning and dimming the backlight system, further comprising: centralizing the wavelength of the multiple light emitting elements of each light emitting color respectively, so that the wavelengths of the multiple light emitting elements of each color tend to be consistent; uniformly adjusting the light emitting luminance of the multiple light emitting elements of each light emitting color respectively, so that the light emitting luminance of the multiple light emitting elements of each color tends to be consistent.

6. The method of claim 5, wherein the method further comprises: The centralizing adjustment of the wavelength of the multiple light emitting elements specifically comprises: providing an initial driving current to the multiple light emitting elements; measuring the wavelength of each light emitting element, and when it is inconsistent with the preset wavelength, adjusting the initial driving current corresponding to it so that its wavelength tends to be consistent with the preset wavelength.

7. The backlight system driving method according to claim 5 or 6, wherein The uniformly adjusting of the light emitting luminance of the multiple light emitting elements specifically comprises: adjusting the working duty cycle of the light emitting element to adjust the light emitting luminance of the light emitting element to tend to be consistent with the target light emitting luminance; wherein the target light emitting luminance is the lowest light emitting luminance among the multiple light emitting elements.

8. A backlight system zone driving device, characterized in that, The backlight system comprises multiple groups of light emitting units, each group of the light emitting units comprises multiple light emitting elements, the light emitting colors of the multiple light emitting elements of each group of the light emitting units are different, and the partition driving device comprises: partition module, for partitioning the light emitting system; partition dimming module, for adjusting the chromaticity of the light emitting units in multiple partitions respectively based on the color of the corresponding display area.

9. The apparatus according to claim 8, wherein Further comprising: wavelength centralization adjustment module, for centralizing the wavelength of the multiple light emitting elements of each color respectively, so that their wavelengths tend to be consistent; luminance centralization adjustment module, for uniformly adjusting the light emitting luminance of the multiple light emitting elements of each color respectively, so that their light emitting luminance tends to be consistent.

10. An electronic device, comprising: comprising: processor; and a memory for storing processor executable instructions; wherein the processor implements the steps in the method of any one of claims 1-7 by running the executable instructions.

11. A computer readable storage medium, characterized in that, a computer program stored thereon, which computer program, when executed by a processor, implements the steps of the method of any one of claims 1-7.

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