Light-emitting system driving method and apparatus, and backlight system

Abstract

The present invention provides a light-emitting system driving method and apparatus, and a backlight system. A light-emitting system comprises a plurality of light-emitting elements of a single color. The light-emitting system driving method comprises: performing centralized adjustment on the wavelengths of the plurality of light-emitting elements, so that the wavelengths of the plurality of light-emitting elements tend to be consistent; and performing consistency adjustment on the light-emitting brightness of the plurality of light-emitting elements, so that the light-emitting brightness of the plurality of light-emitting elements tends to be consistent. The backlight system comprises the light-emitting system, and the light-emitting system is driven by using the light-emitting system driving method. In the technical solution of the present invention, by means of centralized adjustment on the wavelengths of a plurality of light-emitting elements in a light-emitting system, the light-emitting consistency is improved; and by means of brightness consistency adjustment, the uniformity is improved.

Description

Light emitting system driving method and device, backlight system TECHNICAL FIELD

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

[0002] A light emitting element, such as an LED, has a range of wavelengths, usually measured by a half-wave width, due to its inherent characteristics of material and process. For a light emitting system composed of multiple LEDs, the emitted light is inconsistent due to the different wavelengths of the multiple LEDs, and thus the light emitting of different parts of the entire light emitting system is inconsistent. SUMMARY

[0003] The present application provides a light emitting system driving method and device and a backlight system to solve the problem of inconsistent light emitting of multiple light emitting elements in the prior art.

[0004] To solve the above technical problem, the present application is implemented by the following technical scheme:

[0005] According to a first aspect of the present application, a light emitting system driving method is provided, the light emitting system comprising multiple monochromatic light emitting elements, and the driving method comprising:

[0006] centralized adjustment of the wavelengths of the multiple light emitting elements to make the wavelengths consistent;

[0007] consistent adjustment of the light emitting brightness of the multiple light emitting elements to make the light emitting brightness consistent.

[0008] Optionally, the centralized adjustment of the wavelengths of the multiple light emitting elements specifically comprises:

[0009] providing an initial driving current to the multiple light emitting elements;

[0010] measuring the wavelength of each light emitting element, and adjusting the initial driving current corresponding to the light emitting element when the wavelength is inconsistent with a preset wavelength, so that the wavelength is consistent with the preset wavelength.

[0011] Optionally, when the wavelength is inconsistent with the preset wavelength, the initial driving current corresponding to the light emitting element is adjusted so that the wavelength is consistent with the preset wavelength, specifically comprising:

[0012] when the wavelength is inconsistent with the preset wavelength, the initial driving current corresponding to the light emitting element is adjusted in a way of successive fine tuning until the wavelength is consistent with the preset wavelength.

[0013] Optionally, when it is inconsistent with the preset wavelength, the initial driving current corresponding to it is adjusted so that its wavelength tends to be consistent with the preset wavelength, specifically including:

[0014] When it is inconsistent with the preset wavelength, the ratio / difference between the initial driving current corresponding to it and the driving current corresponding to the preset wavelength is calculated according to the ratio / difference between its wavelength and the preset wavelength;

[0015] The initial driving current corresponding to it is adjusted according to the calculated ratio / difference, so that its wavelength tends to be consistent with the preset wavelength.

[0016] Optionally, the luminous brightness of multiple light emitting elements is adjusted to be consistent, specifically including:

[0017] The duty cycle of the light emitting element is adjusted to adjust the luminous brightness of the light emitting element to tend to be consistent with the target luminous brightness;

[0018] Among them, the target luminous brightness is the lowest luminous brightness in multiple light emitting elements.

[0019] Optionally, the duty cycle of the light emitting element is adjusted to adjust the luminous brightness of the light emitting element to tend to be consistent with the target luminous brightness, specifically including:

[0020] The duty cycle of the light emitting element is adjusted in a step-by-step fine-tuning manner until the luminous brightness of the light emitting element is adjusted to tend to be consistent with the target luminous brightness.

[0021] Optionally, the duty cycle of the light emitting element is adjusted to adjust the luminous brightness of the light emitting element to tend to be consistent with the target luminous brightness, specifically including:

[0022] The ratio / difference between the driving duty cycle corresponding to it and the driving duty cycle corresponding to the target luminous brightness is calculated according to the ratio / difference between its luminous brightness and the target luminous brightness;

[0023] The driving duty cycle corresponding to it is adjusted according to the calculated ratio / difference, so that its luminous brightness tends to be consistent with the target luminous brightness.

[0024] Optionally, the light emitting system driving method can be applied to a multi-color light emitting system, the multi-color light emitting system including multiple groups of light emitting units, each group of light emitting units including multiple light emitting elements, the light emitting colors of multiple light emitting elements in each group of light emitting units being different, and the driving method including:

[0025] The wavelengths of multiple light emitting elements of each light emitting color are respectively adjusted to be consistent, so that the wavelengths of multiple light emitting elements of each color tend to be consistent;

[0026] The luminous brightness of the multiple light emitting elements of each light emitting color is respectively adjusted to be consistent, so that the luminous brightness of the multiple light emitting elements of each color tends to be consistent.

[0027] Optionally, for the multi-color light emitting system, after the wavelength concentration adjustment and the luminous brightness consistency adjustment of the light emitting elements of each light emitting color, the method further comprises:

[0028] The component ratio of the light emitting color in the light emitting unit is adjusted, so as to adjust the color temperature of the light emitting unit. After the wavelength consistency adjustment and the luminous brightness consistency adjustment, the multi-color light emitting element is adjusted to the color temperature, so as to reach the maximum luminous brightness at a certain color temperature.

[0029] According to a second aspect of the present application, a light emitting system driving device is provided, the light emitting system comprising multiple light emitting elements of single color, the driving device comprising:

[0030] A wavelength concentration adjustment module is configured to concentrate the wavelengths of the multiple light emitting elements, so that the wavelengths tend to be consistent.

[0031] A luminous brightness consistency adjustment module is configured to adjust the luminous brightness of the multiple light emitting elements after the wavelength concentration adjustment, so that the luminous brightness tends to be consistent.

[0032] According to a third aspect of the present application, a backlight system is provided, comprising a light emitting system and a light emitting system driving device for driving the light emitting system.

[0033] The light emitting system driving device is the light emitting system driving device as described above.

[0034] Optionally, for the multi-color light emitting system applied to the backlight system, after the wavelength concentration adjustment and the luminous brightness consistency adjustment of the light emitting elements of each light emitting color, the method further comprises:

[0035] The light emitting system is divided into multiple partitions, and the light emitting units in the multiple partitions are respectively dimmed.

[0036] Optionally, the light emitting units in the multiple partitions are respectively dimmed, specifically comprising:

[0037] The luminous brightness of the light emitting units in the multiple partitions is adjusted. When applied to the backlight, the color and brightness of the backlight and the display panel can be consistent, and the contrast of the image display is further improved.

[0038] Optionally, the light emitting units in the multiple partitions are respectively dimmed, specifically comprising:

[0039] The chroma of the light emitting units in the multiple partitions is adjusted respectively. When used as a backlight, the chroma can be consistent with the color display of the display panel, the color that does not need to be transmitted is reduced, and the energy consumption is reduced.

[0040] According to a fourth aspect of the present application, there is provided an electronic device comprising:

[0041] a processor;

[0042] and a memory for storing processor-executable instructions;

[0043] wherein the processor implements the steps of any of the above methods by executing the executable instructions.

[0044] According to a fifth aspect of the present application, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any of the above methods.

[0045] The light emitting system driving method and device and the backlight system provided by the present application can make the light emitting wavelengths of the light emitting elements consistent by adjusting the wavelengths of the multiple light emitting elements of the light emitting system, improve the light emitting consistency, and make the light emitting brightness of the multiple light emitting elements of the light emitting system consistent, so that the light emitting effect is better.

[0046] The light emitting system driving method and device and the backlight system provided by the present application can make the light emitting wavelengths of the light emitting elements consistent by adjusting the wavelengths of the multiple light emitting elements of the light emitting system, improve the light emitting consistency, and make the light emitting brightness of the multiple light emitting elements of the light emitting system consistent, so that the light emitting effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0048] Fig. 1 is a flowchart of a light emitting system driving method according to an embodiment of the present application;

[0049] Fig. 2 is a schematic diagram of wavelength centralization adjustment according to an embodiment of the present application;

[0050] Fig. 3 is a flowchart of wavelength centralization adjustment according to an embodiment of the present application;

[0051] Figure 4 is a curve diagram of wavelength centralization adjustment of an embodiment of the present application;

[0052] Figure 5 is a flow chart of a driving method of a multi-color light emitting system of an embodiment of the present application;

[0053] Figure 6 is a diagram of color gamut range after wavelength centralization adjustment of an embodiment of the present application;

[0054] Figure 7 is a diagram of color gamut range without wavelength centralization adjustment in the prior art;

[0055] Figure 8 is a flow chart of a driving method of a multi-color light emitting system of an embodiment of the present application;

[0056] Figure 9 is a flow chart of a partition driving method of a multi-color light emitting system of an embodiment of the present application;

[0057] Figure 10a is a diagram of display corresponding to a display system of an embodiment of the present application;

[0058] Figure 10b is a diagram of partition luminance adjustment of a multi-color light emitting system of an embodiment of the present application;

[0059] Figure 11a is a diagram of display corresponding to a display system of an embodiment of the present application;

[0060] Figure 11b is a diagram of partition luminance and chrominance adjustment of a multi-color light emitting system of an embodiment of the present application;

[0061] Figure 12 is a diagram of a light emitting system driving device of an embodiment of the present application;

[0062] Figure 13 is a diagram of an electronic device of an embodiment of the present application;

[0063] Legend: 11-wavelength centralization adjustment module, 12-luminance uniformization adjustment module; 21-processor, 22-internal bus, 23-network interface, 24-internal memory, 25-external memory. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying 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 other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0065] In the description 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 based on 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 devices or elements referred to 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.

[0066] In the description of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0067] 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.

[0068] In the description of the present application, unless otherwise explicitly specified and limited, the term "connection" and the like should be broadly understood, 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, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0069] The technical solutions of the present application will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes can not be described in some examples.

[0070] It has been pointed out above that the wavelength emitted by the LED is a range due to the inherent characteristics of its material and process, which is usually measured by half-wave width. In order to reduce the fluctuation range of multiple LED light emission, the LED is generally subjected to BIN operation, that is, classification according to certain parameter range, such as colorimetric BIN, which is usually classified by LED with 5nm as the boundary. The above classification has a relatively high requirement on the wavelength, that is, the product selection requirement is high, the effective output of the product is low, and the product screening consumes a long time; in addition, even if only one color product is selected, the wavelength will fluctuate within 5nm, and the light emission consistency is still not high enough.

[0071] In order to solve the above problems, in an embodiment of the present application, a light emitting system driving method is provided, wherein the light emitting system includes a plurality of light emitting elements of a single color. Please refer to FIG. 1, the driving method includes:

[0072] S11: the wavelengths of the multiple light emitting elements are collectively adjusted to be consistent;

[0073] S12: the luminous brightness of the multiple light emitting elements is collectively adjusted to be consistent.

[0074] The wavelengths of the multiple light emitting elements of the light emitting system are collectively adjusted to make the light emitting wavelengths of the light emitting elements consistent, thereby improving the light emitting consistency, and thus the selection requirement of the light emitting elements is relatively low, and even if the wavelengths are relatively discrete, it does not matter, thereby saving the selection time; and because the selection requirement of the light emitting elements is low, the failure rate of the light emitting elements is low, thereby reducing the cost. In addition, the luminous brightness of the multiple light emitting elements of the light emitting system is collectively processed, the brightness is more uniform, and the light emitting effect is better.

[0075] The above light emitting system includes multiple light emitting elements of a single color, which should be understood as: for a color (single color) of light emitting element including multiple, the multiple light emitting elements of a single color are collectively adjusted. However, the light emitting system does not necessarily include only one color of light emitting element, and can include two or three colors. For each color (single color) of light emitting element including multiple, the multiple light emitting elements of each color can be collectively adjusted respectively, or only the multiple light emitting elements of one or several colors can be collectively adjusted respectively.

[0076] As an embodiment, in the collective adjustment of the wavelengths of the multiple light emitting elements, the wavelengths of the multiple light emitting elements are not necessarily the same value, but are allowed to fluctuate within a preset range. The following is described by way of example. Referring to FIG. 2, taking two BIN chroma (G1m-G2m) green light as an example, the range of the two BINs can be reduced to the range shown in block 1, such as ±1 nm, as shown in FIG. 2, the adjusted wavelength is within 527±1 nm. The fluctuation range can be set according to the requirement of light emitting consistency. If the light emitting consistency requirement is high, the fluctuation range can be set to be relatively small, and if the light emitting consistency requirement is low, the fluctuation range can be set to be relatively large.

[0077] As an embodiment, in the collective adjustment of the luminous brightness of the multiple light emitting elements, the luminous brightness of the multiple light emitting elements is not necessarily the same value, but is allowed to fluctuate within a preset range. The specific fluctuation range can be set according to the requirement of brightness consistency. If the brightness consistency requirement is high, the fluctuation range can be set to be relatively small, and if the brightness consistency requirement is low, the fluctuation range can be set to be relatively large.

[0078] In an embodiment, referring to FIG. 3, the collective adjustment of the wavelengths of the multiple light emitting elements includes:

[0079] S111: providing an initial driving current I to the plurality of light emitting elements, at this time, the light emitting elements are in a light emitting state, but their respective wavelengths are different;

[0080] As an embodiment, the initial driving current can be determined according to the light emitting element characteristics and the target wavelength.

[0081] S112: measuring the wavelength of each light emitting element, and determining whether the wavelength is consistent with the preset wavelength;

[0082] S113: when the wavelength is not consistent with the preset wavelength, adjusting the initial driving current corresponding to the light emitting element, so that the wavelength tends to be consistent with the preset wavelength.

[0083] As an embodiment, S112 can be implemented by using the way of gradually adjusting the current.

[0084] The way of gradually adjusting the current will be described in detail below by taking an example. Taking a green LED as an example, assuming that the initial driving current is 20 mA, and the preset wavelength is 527 nm. As shown in FIG. 4, it is a characteristic curve diagram of the current and the main wavelength of the green LED. The wavelength of each LED is measured. Referring to FIG. 4, if the wavelength of the 12th LED is measured to be 523 nm, the driving current of the 12th LED is gradually reduced by 2 mA each time, and the wavelength is measured again after each reduction, until the wavelength is close to 527 nm. In the figure, five times of wavelength measurement are performed by taking four times of current adjustment as an example.

[0085] 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 gradually increased by 2 mA each time.

[0086] In the above embodiment, the gradual adjustment of the current is implemented by taking the gradual adjustment of the preset step as an example, and the preset step of each adjustment is the same. In different embodiments, the step of each adjustment is not necessarily the same, and can be adjusted according to the actual situation. For example, when the measured wavelength and the preset wavelength are greatly different (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.

[0087] Because the characteristic curve of the current and the main wavelength of each light emitting element is different, the adjustment error of the wavelength consistency is smaller by using the way of gradually adjusting the current.

[0088] 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 settings can be made in different embodiments.

[0089] Of course, in different embodiments, the adjustment of the driving current in S112 can also not adopt the form of successive fine adjustment, but can be calculated according to the ratio of the wavelength of the light emitting element to the preset wavelength to obtain the ratio of the corresponding current, and the current is adjusted to the right once according to the ratio.

[0090] In different embodiments, the difference of the wavelength of the light emitting element to the preset wavelength can also be calculated to obtain the difference of the corresponding current, and the current is adjusted to the right once according to the difference.

[0091] In an embodiment, the adjustment of the light emitting brightness of the plurality of light emitting elements in S12 includes: adjusting the working duty cycle of the light emitting element, and adjusting the light emitting brightness of the light emitting element to the lowest light emitting brightness (target light emitting brightness) in the plurality of light emitting elements.

[0092] Since the driving current has been determined after the wavelength consistency adjustment, it cannot be adjusted again, and the application proposes to adjust the working duty cycle to achieve the adjustment of the light emitting brightness. If the light emitting brightness is adjusted by the working duty cycle, the light emitting element with the lowest light emitting brightness cannot be further increased in brightness even if the working duty cycle is 100%, so it is necessary to reduce the high light emitting brightness to the brightness, that is, to adjust the light emitting brightness of the light emitting element to the lowest light emitting brightness in the plurality of light emitting elements.

[0093] As an implementation, the light emitting brightness adjustment of the nth light emitting element can be expressed by the following relationship: L ri = K1 * I n * D n , wherein I n is the driving current value after S112 adjustment, and D n is the working duty cycle.

[0094] As an implementation, the adjustment of the light emitting brightness of each light emitting element in S12 can also adopt the way of successive fine adjustment of the working duty cycle.

[0095] The successive fine adjustment of the duty cycle is described in detail below. For the light emitting element with high light emitting brightness, the working duty cycle can be reduced by 5% step, and the brightness is measured again after each reduction until the target light emitting brightness is approached.

[0096] It should be understood that the working duty cycle adjustment step value given above is only an example, and different embodiments can have different settings.

[0097] In addition, in the above embodiment, the step-by-step fine adjustment of the duty cycle is implemented by taking the preset step size as an example. The step size of each fine adjustment is not necessarily the same in different embodiments, and can be adjusted according to actual conditions. For example, when the current luminous brightness and the target luminous brightness are greatly different (for example, the difference is greater than a first preset value), a large step size can be used for adjustment first. When the adjustment is close to the target luminous brightness (for example, the difference is less than a second preset value), a small step size can be used for adjustment.

[0098] Of course, in different embodiments, the adjustment of the duty cycle can also not use the step-by-step fine adjustment method, but can calculate the duty cycle according to the ratio between the luminous brightness and the target luminous brightness, and adjust it to the target luminous brightness at one time.

[0099] In different embodiments, the difference between the luminous brightness and the target luminous brightness can also be used to calculate the difference between the duty cycle of the luminous brightness and the duty cycle of the target luminous brightness, and the duty cycle of the luminous brightness can be adjusted according to the difference to adjust it to the target luminous brightness at one time.

[0100] In an embodiment, S112 further includes storing the final current data of each light emitting element, and completing the color coordinate centralized calibration action. S12 further includes storing the final duty cycle data of each light emitting element, and completing the brightness consistent calibration action. For the light emitting 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.

[0101] In an application example, the above light emitting system driving method can be used in a backlight system.

[0102] In an application example, the above light emitting system can be a monochromatic light emitting system, for example, a system for forming white light by exciting a quantum film with a blue LED.

[0103] In an application example, the light emitting system can also be a multi-color light emitting system.

[0104] In an embodiment, the light emitting system includes a plurality of light emitting units, each light emitting unit includes a plurality of light emitting elements, and the light emitting colors of the plurality of light emitting elements of each light emitting unit are different.

[0105] As an embodiment, the light emitting system can be a three-color light emitting system, for example, an RGB light emitting system. Specifically, the light emitting system includes a plurality of 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.

[0106] As another embodiment, for the dual-color light emitting system, two colors which are complementary to each other can be adopted so as to generate white light. Of course, for the light emitting system which does not need white light, other colors can be selected as needed.

[0107] Referring to FIG. 5, the multi-color light emitting system driving method can include:

[0108] S21: the wavelength of the light emitting elements of each color is respectively adjusted to be concentrated, so that the wavelengths of the light emitting elements of each color tend to be consistent;

[0109] S22: the light emitting brightness of the light emitting elements of each color is respectively adjusted to be consistent, so that the light emitting brightness of the light emitting elements of each color tends to be consistent.

[0110] The multi-color light emitting system of the above embodiment can also be applied to backlight. After S21 and S22, the light emitting of each light emitting element is more consistent, and the light emitting of the entire backlight is also more consistent.

[0111] Furthermore, the multi-color light emitting system of the above embodiment, after S21, expands the color gamut of the multi-color light emitting system, so that the color gamut of the multi-color light emitting system is wider. The principle thereof is described below. Referring to FIG. 6, which is a color gamut range diagram of the present application after wavelength concentration adjustment, taking the RGB three-color light emitting system as an example, after wavelength concentration adjustment, the wavelengths of the light emitting elements of R, G and B are respectively reduced to a relatively small range, as shown by blocks 2, 1 and 3 in the figure, and the color gamut range of the mixed light of the three colors is a triangle surrounded by the dashed line in the figure. Referring to FIG. 7, which is a color gamut range diagram of the prior art without wavelength consistency adjustment, the light emitting elements after mixing of the three colors are within the "greatest common divisor" range of the color coordinates, i.e. the triangular portion marked with diagonal lines in the figure. From the comparison of the two color gamut ranges, it can be seen that the wavelength concentration adjustment of the present application does not affect the inherent color gamut of the light emitting element, and can keep the color coordinates and the color gamut range stable; compared with the prior art without wavelength adjustment, the present application can expand the color gamut range of the multi-color light emitting system.

[0112] 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, the wavelength consistency and light emitting brightness concentration adjustment is needed for the light emitting elements of G, and the wavelength consistency and light emitting brightness consistency adjustment is needed for the light emitting elements of B.

[0113] It should be understood that the adjustment order is not limited as long as the wavelength concentration and the luminous intensity consistency adjustment of each light emitting element of each light emitting color are achieved. The following examples are given for light emitting elements of three colors of R, G and B. The wavelength concentration adjustment of the light emitting elements of the three colors of R, G and B can be performed first, and then the luminous intensity consistency adjustment of the light emitting elements of the three colors of R, G and B can be performed. Alternatively, the wavelength concentration adjustment and the luminous intensity consistency adjustment of the light emitting elements of one color can be performed first, and then the wavelength concentration adjustment and the luminous intensity consistency adjustment of the light emitting elements of the other two colors can be performed in turn. Of course, the wavelength concentration adjustment and the luminous intensity consistency adjustment of the three colors can be performed simultaneously.

[0114] In an embodiment, after the wavelength concentration adjustment and the luminous intensity consistency adjustment of the light emitting elements of each light emitting color are completed, the method further includes:

[0115] S231: adjusting the component ratio of the light emitting colors in the light emitting unit to adjust the color temperature of the light emitting unit. The maximum white light intensity at a certain color temperature can be obtained through S23.

[0116] In an embodiment, after S23, the method further includes: storing the finally obtained component ratio data to complete the color temperature calibration. For a light emitting system determined by the light emitting elements, the above driving process is equivalent to initial driving calibration, which needs to be completed only once, and the subsequent process only needs to call the above stored component ratio data.

[0117] As an embodiment, taking RGB as an example, the adjustment of the component ratio of the light emitting colors (i.e. the color temperature duty cycle d) in the light emitting unit in S23 can be expressed by the following relationship:

[0118] L B_ri =K1*I Bn *D n *d B ,

[0119] L G_ri =K1*I Gn *D n *d G ,

[0120] L R_ri =K1*I Rn *D n *d R ;

[0121] wherein I Bn、 I Gn、 I Rn represent the driving current values of the blue, green and red light emitting elements after adjustment, respectively, and dB , d G , d R respectively represent the duty cycles corresponding to blue, green and red at different color temperatures.

[0122] The color temperature adjustment is described in detail below with an example. According to the brightness equation of BT2020, when R, G and B lights are mixed into 6500K white light, the brightness ratio is 0.2627:0.6780:0.0593, i.e. Y=0.2627R+0.6780G+0.0593B. According to the current values and working duty cycles of the light emitting elements obtained in the first two steps, the ratio of the maximum brightness of R, G and B after brightness consistency is different from the ratio of the above brightness equation coefficients, so the color temperature after light mixing will not be 6500K. Assuming that the brightness ratio of R, G and B after consistency is 1:2:1, the color temperature duty cycles d need 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 obtained brightness at this time is Y d , which is the maximum white field brightness at 6500K color temperature. Of course, in different embodiments, if other color temperature d values are needed, they can be calculated according to the brightness equation coefficients.

[0123] 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.

[0124] In an embodiment, referring to FIG. 9, after the wavelength centralization adjustment and the light emitting brightness consistency adjustment of the multiple light emitting elements of each light emitting color are completed, the method further includes:

[0125] S232: dividing the light emitting system into multiple partitions, and adjusting the light emitting units in the multiple partitions respectively, which can improve the contrast of liquid crystal display.

[0126] As an implementation, the adjustment of the light emitting units in the multiple partitions in S33 can be represented by the following relationship:

[0127] L B_ri =K*I Bn *Dn*T Bn ,

[0128] L G_ri =K*I Gn *Dn*TGn ,

[0129] L R_ri = K * I Rn * D n * T Rn ;

[0130] wherein, T Bn , T Gn , T Rn respectively represent the dimming duty cycle of blue, green, red.

[0131] In an embodiment, the light emitting units in the multiple partitions are respectively dimmed, specifically including: adjusting the brightness of the light emitting units in the multiple partitions. When the T of multiple colors changes equally, for example, RGB, when T Bn , T Gn , T Rn change equally, that is, the brightness adjustment of the light emitting units in the partition is realized.

[0132] In an embodiment, the light emitting units in the multiple partitions are respectively dimmed, specifically including: adjusting the chroma of the light emitting units in the multiple partitions.

[0133] In an embodiment, S231 and S232 can be included at the same time, and the color temperature of the multiple light emitting units can be adjusted through S231 first, and then the partition dimming is performed through S232.

[0134] After increasing the color temperature adjustment, the light emitting units in the multiple partitions can be respectively dimmed using the following relationship:

[0135] L B_ri = K * I Bn * D n * d B * T Bn ,

[0136] L G_ri = K * I Gn * D n * d G * T Gn ,

[0137] L R_ri = K * I Rn * D n * d R * T Rn .

[0138] The following example is used to illustrate the partitioned brightness adjustment, please refer to Figures 10a and 10b. In this embodiment, the multi-color light emitting system is applied to the backlight. Figure 10a shows the image displayed by the liquid crystal panel, and Figure 10b shows the corresponding brightness of the partitioned backlight. For the position of the candle flame, the image is bright, and the corresponding backlight partitioned brightness is also adjusted to be high. For the position between the bottom of the candle flame and the candle, the bottom of the candle and the other black background, the brightness of the backlight is reduced, which can further improve the contrast of the image.

[0139] As an embodiment, the brightness coefficient of the partitioned brightness adjustment can be obtained by the following method: calculating the average value of the brightness of all pixels in each partition of the displayed image, and forming a mapping relationship between the average value and the backlight brightness. For example, if the image is 8 bits, the average value of the brightness of each partition is between 0 and 255. If the mapping relationship is linear, the corresponding backlight partitioned brightness coefficient is "average value / 255".

[0140] As given in the above embodiment, the duty cycle T can be used to represent the brightness coefficient, i.e. the brightness of a certain backlight partition is LZn=T*Zn n = Y d *T = K*I Bn *D n *d B *T Bn + K*I Gn *D n *d G *T Gn + K*I Rn *D n *d R *T Rn Because T Bn , T Gn , T Rn change equally, i.e. T Bn = T Gn = T Rn , the color temperature of LZn is still 6500K.

[0141] The following example is used to illustrate the partitioned chroma adjustment, please refer to Figures 11a and 11b. In this embodiment, the driving system is applied to the backlight. The color image displayed by the liquid crystal panel is realized by changing the transmittance T of different color pixels. As shown in Figure 11a, the red color displayed in the yellow square is because the blue and green light in the backlight does not mostly transmit through the liquid crystal panel, i.e. the blue and green light in the backlight in this area is not needed to participate in the image display, so this part of light is wasted. In this embodiment, the partitioned chroma adjustment can reduce the blue and green components in the backlight in the partition, achieving the energy saving effect. As shown in Figure 11a, the value of the pixel RGB at point A is (255, 128, 32), and the brightness of point A is:

[0142] has (255-128) / 255 parts K*I Gn *D n *d G wasted, has (255-32) / 255 parts K*I Bn *D n *d B wasted, i.e. low proportion of green light and blue light. By adjusting the backlight in zones, the luminous intensity (i.e. chroma) of the blue and green light emitting elements in the zone is actively reduced, for example: the green light can be reduced to 50%, and the blue light can be reduced to 12.5%, i.e. T Rn is 100%, T Gn is 50%, T Bn is 12.5%, thus saving 50% of the green light power consumption and 87.5% of the blue light power consumption, avoiding the waste of this part of the power consumption, and saving energy.

[0143] It should be understood that there are multiple ways to determine the low proportion: (1) all proportions below 255 can be determined to be low, for example, in the above embodiment, the green light and blue light below 255 are determined to be low, and the chroma of the green light and blue light is adjusted; (2) a proportion preset value can be set, and proportions below the preset value are determined to be low, for example, if the proportion preset value is 130, then the green light and blue light above are determined to be low, and the chroma of the green light and blue light is adjusted; if the proportion preset value is 120, then only the blue light above is determined to be low, and the chroma of the blue light is adjusted; (3) it can also be set that only the lowest proportion of the three components is determined to be low, and then only the lowest blue light above is determined to be low, and the chroma of the blue light is adjusted.

[0144] There are also multiple ways to adjust the chroma of the low proportion light emitting color: (1) the proportion of the light emitting color to 255 can be used to determine the size of the chroma adjustment; (2) a proportion preset value range and a corresponding chroma adjustment preset value can also be set, when the proportion value is within the proportion preset value range, the chroma is adjusted according to the corresponding chroma adjustment preset value, for example: if the proportion preset value range is 【100-130】, the corresponding chroma adjustment preset value is 55%, then the proportion value of the green light above is within the range, and the green light is reduced to 55%; The proportion preset value range can be set to one or more, for example, in addition to the above 【100-130】, a proportion preset value range 【30-60】 can also be set, and the corresponding chroma adjustment preset value is 15%, then the proportion value of the blue light above is within the range, and the blue light is reduced to 15%.

[0145] Of course, the above-mentioned proportion preset value range and chrominance adjustment value are only examples, and different settings can be made according to needs; and the above-mentioned is only for the (255, 128, 32) pixel value to be targeted, in order to cover more pixel value cases, the proportion preset value range can also be set more.

[0146] In an embodiment, due to the reduction of the chrominance of the part of light, the luminance of point A is reduced, and for this, the corresponding transmittance T can be increased while the chrominance of green light and blue light is reduced AG and T AG , so that LA remains unchanged:

[0147] 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, and energy is saved.

[0148] In an embodiment, on the basis of chrominance adjustment, the luminance is also adjusted to realize mixed adjustment of chrominance and luminance. For the sub-area corresponding to the display area which is relatively bright, the luminance of the light emitting unit can be increased, and for the sub-area corresponding to the display area which is relatively dark, the luminance of the light emitting unit can be reduced, so that the luminance of the backlight corresponding to the sub-area is consistent with the display panel, and the contrast of image display is improved.

[0149] When the T of the multiple light emitting colors of the light emitting unit changes by different proportions, for example, RGB, when T Bn , T Gn , T Rn changes by different proportions, that is, the adjustment of the luminance and chrominance of the light emitting unit of the sub-area is realized.

[0150] In an embodiment, a light emitting system driving device is also provided, and the light emitting system includes multiple light emitting elements of a single color. Please refer to FIG. 12, the driving device of the light emitting system includes:

[0151] A wavelength centralization adjustment module 11 is configured to perform centralization adjustment on the wavelengths of the multiple light emitting elements, so that the wavelengths tend to be consistent;

[0152] A light emitting luminance uniformization adjustment module 12 is configured to perform uniformization adjustment on the light emitting luminance of the multiple light emitting elements, so that the light emitting luminance tends to be consistent.

[0153] In an embodiment, the wavelength centralization adjustment module 11 specifically includes:

[0154] An initial driving current providing module is configured to provide an initial driving current to the multiple light emitting elements;

[0155] A current fine-tuning module is configured to measure the wavelength of each light emitting element, and adjust the initial driving current of each light emitting element when the wavelength of each light emitting element is inconsistent with the preset wavelength, so that the wavelength of each light emitting element is consistent with the preset wavelength.

[0156] In an embodiment, the light emitting system driving apparatus can be applied to a multi-color light emitting system. The multi-color light emitting system includes a plurality of groups of light emitting units. Each group of light emitting units includes a plurality of light emitting elements. The light emitting elements in each group of light emitting units have different light emitting colors.

[0157] In an embodiment, when applied to a multi-color light emitting system, the light emitting system driving apparatus further includes:

[0158] A color temperature adjustment module is configured to adjust the component ratio of the light emitting color in the light emitting unit, so as to adjust the color temperature of the light emitting unit.

[0159] The multi-color light emitting element after the wavelength centralization and the brightness consistency adjustment is adjusted to a white light color temperature, so that the multi-color light emitting element reaches the maximum luminous brightness at the color temperature.

[0160] In an embodiment, when applied to a multi-color light emitting system, the light emitting system driving apparatus further includes:

[0161] A partition dimming module is configured to divide the light emitting system into a plurality of partitions, and to dim the light emitting units in the plurality of partitions respectively.

[0162] In an embodiment, the partition dimming module is specifically configured to adjust the brightness of the light emitting units in the plurality of partitions respectively.

[0163] In an embodiment, the partition dimming module is specifically configured to adjust the brightness and the chrominance of the light emitting units in the plurality of partitions respectively.

[0164] In an embodiment, an electronic device is provided, as shown in FIG. 13. At the hardware level, the device includes a processor 21, an internal bus 22, a network interface 23, a memory 24, a storage 25, and possibly other hardware required for business. One or more embodiments of the present application can be implemented in a software manner, such as reading a 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 devices or a combination of software and hardware. That is, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or a logic device.

[0165] The systems, apparatuses, modules, or units illustrated in the above embodiments can be specifically implemented by computer chips or entities, or by products 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 e-mail device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0166] In one typical configuration, a computer includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0167] The memory can include non-persistent memory, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or Flash memory, among others. The memory is an example of computer-readable media.

[0168] Computer-readable media includes permanent and non-permanent, removable and non-removable media, which can be implemented by any method or technology for storing information. Information can be 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 computer-readable media, such as modulated data signals and carriers.

[0169] The above describes specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous or possible.

[0170] In the description of the specification, the description of the terms "one implementation", "one embodiment", "specific implementation process", "one example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the description, 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.

[0171] 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 for 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 of driving a light emitting system, characterized by, The light emitting system includes a plurality of light emitting elements of a single color, and the driving method includes: centralized adjustment of the wavelengths of the plurality of light emitting elements to make the wavelengths consistent; consistent adjustment of the light emitting brightness of the plurality of light emitting elements to make the light emitting brightness consistent.

2. The light emitting system driving method of claim 1, wherein The centralized adjustment of the wavelengths of the plurality of light emitting elements specifically includes: providing an initial driving current to the plurality of light emitting elements; measuring the wavelength of each light emitting element, and adjusting the initial driving current corresponding to the light emitting element when the wavelength is inconsistent with a preset wavelength, so that the wavelength is consistent with the preset wavelength.

3. The light emitting system driving method according to claim 2, wherein The adjustment of the initial driving current corresponding to the light emitting element when the wavelength is inconsistent with the preset wavelength, so that the wavelength is consistent with the preset wavelength, specifically includes: adjusting the initial driving current corresponding to the light emitting element in a step-by-step fine-tuning manner when the wavelength is inconsistent with the preset wavelength, until the wavelength is consistent with the preset wavelength.

4. The light emitting system driving method of claim 2, wherein The adjustment of the initial driving current corresponding to the light emitting element when the wavelength is inconsistent with the preset wavelength, so that the wavelength is consistent with the preset wavelength, specifically includes: when the wavelength is inconsistent with the preset wavelength, calculating the ratio / difference between the initial driving current corresponding to the light emitting element and the driving current corresponding to the preset wavelength according to the ratio / difference between the wavelength and the preset wavelength; adjusting the initial driving current corresponding to the light emitting element according to the calculated ratio / difference, so that the wavelength is consistent with the preset wavelength.

5. The light emitting system driving method according to any one of claims 1 to 4, wherein The consistent adjustment of the light emitting brightness of the plurality of light emitting elements specifically includes: adjusting the duty cycle of the light emitting element to adjust the light emitting brightness of the light emitting element to be consistent with the target light emitting brightness; wherein the target light emitting brightness is the lowest light emitting brightness among the plurality of light emitting elements.

6. The light emitting system driving method according to claim 5, wherein The adjustment of the duty cycle of the light emitting element to adjust the light emitting brightness of the light emitting element to be consistent with the target light emitting brightness specifically includes: adjusting the duty cycle of the light emitting element in a step-by-step fine-tuning manner until the light emitting brightness of the light emitting element is adjusted to be consistent with the target brightness.

7. The light emitting system driving method according to claim 5, wherein The adjustment of the duty cycle of the light emitting element to adjust the light emitting brightness of the light emitting element to be consistent with the target light emitting brightness specifically includes: calculating the ratio / difference between the driving duty cycle corresponding to the target light emitting brightness and the driving duty cycle corresponding to the light emitting element according to the ratio / difference between the light emitting brightness of the light emitting element and the target light emitting brightness; adjusting the driving duty cycle corresponding to the light emitting element according to the calculated ratio / difference, so that the light emitting brightness is consistent with the target light emitting brightness.

8. A driving device for a light-emitting system, characterized in that, The light emitting system includes a plurality of light emitting elements of a single color, and the driving device includes: a wavelength centralized adjustment module for centralized adjustment of the wavelengths of the plurality of light emitting elements to make the wavelengths consistent; a brightness consistent adjustment module for consistent adjustment of the light emitting brightness of the plurality of light emitting elements after the wavelength centralized adjustment to make the light emitting brightness consistent.

9. A backlight system characterized by comprising: includes: a light emitting system and a light emitting system driving device for driving the light emitting system; The light emitting system driving apparatus is the light emitting system driving apparatus of claim 8.

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

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

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